| File: | src/usr.bin/ssh/ssh/../sshkey.c |
| Warning: | line 2194, column 7 Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret' |
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| 1 | /* $OpenBSD: sshkey.c,v 1.120 2022/01/06 22:05:42 djm Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| 4 | * Copyright (c) 2008 Alexander von Gernler. All rights reserved. |
| 5 | * Copyright (c) 2010,2011 Damien Miller. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <netinet/in.h> |
| 30 | |
| 31 | #ifdef WITH_OPENSSL1 |
| 32 | #include <openssl/evp.h> |
| 33 | #include <openssl/err.h> |
| 34 | #include <openssl/pem.h> |
| 35 | #endif |
| 36 | |
| 37 | #include "crypto_api.h" |
| 38 | |
| 39 | #include <errno(*__errno()).h> |
| 40 | #include <stdio.h> |
| 41 | #include <string.h> |
| 42 | #include <util.h> |
| 43 | #include <limits.h> |
| 44 | #include <resolv.h> |
| 45 | |
| 46 | #include "ssh2.h" |
| 47 | #include "ssherr.h" |
| 48 | #include "misc.h" |
| 49 | #include "sshbuf.h" |
| 50 | #include "cipher.h" |
| 51 | #include "digest.h" |
| 52 | #define SSHKEY_INTERNAL |
| 53 | #include "sshkey.h" |
| 54 | #include "match.h" |
| 55 | #include "ssh-sk.h" |
| 56 | |
| 57 | #ifdef WITH_XMSS |
| 58 | #include "sshkey-xmss.h" |
| 59 | #include "xmss_fast.h" |
| 60 | #endif |
| 61 | |
| 62 | /* openssh private key file format */ |
| 63 | #define MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n" "-----BEGIN OPENSSH PRIVATE KEY-----\n" |
| 64 | #define MARK_END"-----END OPENSSH PRIVATE KEY-----\n" "-----END OPENSSH PRIVATE KEY-----\n" |
| 65 | #define MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1) (sizeof(MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1) |
| 66 | #define MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1) (sizeof(MARK_END"-----END OPENSSH PRIVATE KEY-----\n") - 1) |
| 67 | #define KDFNAME"bcrypt" "bcrypt" |
| 68 | #define AUTH_MAGIC"openssh-key-v1" "openssh-key-v1" |
| 69 | #define SALT_LEN16 16 |
| 70 | #define DEFAULT_CIPHERNAME"aes256-ctr" "aes256-ctr" |
| 71 | #define DEFAULT_ROUNDS16 16 |
| 72 | |
| 73 | /* Version identification string for SSH v1 identity files. */ |
| 74 | #define LEGACY_BEGIN"SSH PRIVATE KEY FILE FORMAT 1.1\n" "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
| 75 | |
| 76 | /* |
| 77 | * Constants relating to "shielding" support; protection of keys expected |
| 78 | * to remain in memory for long durations |
| 79 | */ |
| 80 | #define SSHKEY_SHIELD_PREKEY_LEN(16 * 1024) (16 * 1024) |
| 81 | #define SSHKEY_SHIELD_CIPHER"aes256-ctr" "aes256-ctr" /* XXX want AES-EME* */ |
| 82 | #define SSHKEY_SHIELD_PREKEY_HASH4 SSH_DIGEST_SHA5124 |
| 83 | |
| 84 | int sshkey_private_serialize_opt(struct sshkey *key, |
| 85 | struct sshbuf *buf, enum sshkey_serialize_rep); |
| 86 | static int sshkey_from_blob_internal(struct sshbuf *buf, |
| 87 | struct sshkey **keyp, int allow_cert); |
| 88 | |
| 89 | /* Supported key types */ |
| 90 | struct keytype { |
| 91 | const char *name; |
| 92 | const char *shortname; |
| 93 | const char *sigalg; |
| 94 | int type; |
| 95 | int nid; |
| 96 | int cert; |
| 97 | int sigonly; |
| 98 | }; |
| 99 | static const struct keytype keytypes[] = { |
| 100 | { "ssh-ed25519", "ED25519", NULL((void*)0), KEY_ED25519, 0, 0, 0 }, |
| 101 | { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL((void*)0), |
| 102 | KEY_ED25519_CERT, 0, 1, 0 }, |
| 103 | { "sk-ssh-ed25519@openssh.com", "ED25519-SK", NULL((void*)0), |
| 104 | KEY_ED25519_SK, 0, 0, 0 }, |
| 105 | { "sk-ssh-ed25519-cert-v01@openssh.com", "ED25519-SK-CERT", NULL((void*)0), |
| 106 | KEY_ED25519_SK_CERT, 0, 1, 0 }, |
| 107 | #ifdef WITH_XMSS |
| 108 | { "ssh-xmss@openssh.com", "XMSS", NULL((void*)0), KEY_XMSS, 0, 0, 0 }, |
| 109 | { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL((void*)0), |
| 110 | KEY_XMSS_CERT, 0, 1, 0 }, |
| 111 | #endif /* WITH_XMSS */ |
| 112 | #ifdef WITH_OPENSSL1 |
| 113 | { "ssh-rsa", "RSA", NULL((void*)0), KEY_RSA, 0, 0, 0 }, |
| 114 | { "rsa-sha2-256", "RSA", NULL((void*)0), KEY_RSA, 0, 0, 1 }, |
| 115 | { "rsa-sha2-512", "RSA", NULL((void*)0), KEY_RSA, 0, 0, 1 }, |
| 116 | { "ssh-dss", "DSA", NULL((void*)0), KEY_DSA, 0, 0, 0 }, |
| 117 | { "ecdsa-sha2-nistp256", "ECDSA", NULL((void*)0), |
| 118 | KEY_ECDSA, NID_X9_62_prime256v1415, 0, 0 }, |
| 119 | { "ecdsa-sha2-nistp384", "ECDSA", NULL((void*)0), |
| 120 | KEY_ECDSA, NID_secp384r1715, 0, 0 }, |
| 121 | { "ecdsa-sha2-nistp521", "ECDSA", NULL((void*)0), |
| 122 | KEY_ECDSA, NID_secp521r1716, 0, 0 }, |
| 123 | { "sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL((void*)0), |
| 124 | KEY_ECDSA_SK, NID_X9_62_prime256v1415, 0, 0 }, |
| 125 | { "webauthn-sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL((void*)0), |
| 126 | KEY_ECDSA_SK, NID_X9_62_prime256v1415, 0, 1 }, |
| 127 | { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL((void*)0), |
| 128 | KEY_RSA_CERT, 0, 1, 0 }, |
| 129 | { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT", |
| 130 | "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 }, |
| 131 | { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT", |
| 132 | "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 }, |
| 133 | { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL((void*)0), |
| 134 | KEY_DSA_CERT, 0, 1, 0 }, |
| 135 | { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL((void*)0), |
| 136 | KEY_ECDSA_CERT, NID_X9_62_prime256v1415, 1, 0 }, |
| 137 | { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL((void*)0), |
| 138 | KEY_ECDSA_CERT, NID_secp384r1715, 1, 0 }, |
| 139 | { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL((void*)0), |
| 140 | KEY_ECDSA_CERT, NID_secp521r1716, 1, 0 }, |
| 141 | { "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-SK-CERT", NULL((void*)0), |
| 142 | KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1415, 1, 0 }, |
| 143 | #endif /* WITH_OPENSSL */ |
| 144 | { NULL((void*)0), NULL((void*)0), NULL((void*)0), -1, -1, 0, 0 } |
| 145 | }; |
| 146 | |
| 147 | const char * |
| 148 | sshkey_type(const struct sshkey *k) |
| 149 | { |
| 150 | const struct keytype *kt; |
| 151 | |
| 152 | for (kt = keytypes; kt->type != -1; kt++) { |
| 153 | if (kt->type == k->type) |
| 154 | return kt->shortname; |
| 155 | } |
| 156 | return "unknown"; |
| 157 | } |
| 158 | |
| 159 | static const char * |
| 160 | sshkey_ssh_name_from_type_nid(int type, int nid) |
| 161 | { |
| 162 | const struct keytype *kt; |
| 163 | |
| 164 | for (kt = keytypes; kt->type != -1; kt++) { |
| 165 | if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) |
| 166 | return kt->name; |
| 167 | } |
| 168 | return "ssh-unknown"; |
| 169 | } |
| 170 | |
| 171 | int |
| 172 | sshkey_type_is_cert(int type) |
| 173 | { |
| 174 | const struct keytype *kt; |
| 175 | |
| 176 | for (kt = keytypes; kt->type != -1; kt++) { |
| 177 | if (kt->type == type) |
| 178 | return kt->cert; |
| 179 | } |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | const char * |
| 184 | sshkey_ssh_name(const struct sshkey *k) |
| 185 | { |
| 186 | return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); |
| 187 | } |
| 188 | |
| 189 | const char * |
| 190 | sshkey_ssh_name_plain(const struct sshkey *k) |
| 191 | { |
| 192 | return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), |
| 193 | k->ecdsa_nid); |
| 194 | } |
| 195 | |
| 196 | int |
| 197 | sshkey_type_from_name(const char *name) |
| 198 | { |
| 199 | const struct keytype *kt; |
| 200 | |
| 201 | for (kt = keytypes; kt->type != -1; kt++) { |
| 202 | /* Only allow shortname matches for plain key types */ |
| 203 | if ((kt->name != NULL((void*)0) && strcmp(name, kt->name) == 0) || |
| 204 | (!kt->cert && strcasecmp(kt->shortname, name) == 0)) |
| 205 | return kt->type; |
| 206 | } |
| 207 | return KEY_UNSPEC; |
| 208 | } |
| 209 | |
| 210 | static int |
| 211 | key_type_is_ecdsa_variant(int type) |
| 212 | { |
| 213 | switch (type) { |
| 214 | case KEY_ECDSA: |
| 215 | case KEY_ECDSA_CERT: |
| 216 | case KEY_ECDSA_SK: |
| 217 | case KEY_ECDSA_SK_CERT: |
| 218 | return 1; |
| 219 | } |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | int |
| 224 | sshkey_ecdsa_nid_from_name(const char *name) |
| 225 | { |
| 226 | const struct keytype *kt; |
| 227 | |
| 228 | for (kt = keytypes; kt->type != -1; kt++) { |
| 229 | if (!key_type_is_ecdsa_variant(kt->type)) |
| 230 | continue; |
| 231 | if (kt->name != NULL((void*)0) && strcmp(name, kt->name) == 0) |
| 232 | return kt->nid; |
| 233 | } |
| 234 | return -1; |
| 235 | } |
| 236 | |
| 237 | int |
| 238 | sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs) |
| 239 | { |
| 240 | int ktype; |
| 241 | |
| 242 | if (sigalgs == NULL((void*)0) || *sigalgs == '\0' || |
| 243 | (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC) |
| 244 | return 0; |
| 245 | else if (ktype == KEY_RSA) { |
| 246 | return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 || |
| 247 | match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 || |
| 248 | match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1; |
| 249 | } else if (ktype == KEY_RSA_CERT) { |
| 250 | return match_pattern_list("ssh-rsa-cert-v01@openssh.com", |
| 251 | sigalgs, 0) == 1 || |
| 252 | match_pattern_list("rsa-sha2-256-cert-v01@openssh.com", |
| 253 | sigalgs, 0) == 1 || |
| 254 | match_pattern_list("rsa-sha2-512-cert-v01@openssh.com", |
| 255 | sigalgs, 0) == 1; |
| 256 | } else |
| 257 | return match_pattern_list(keyname, sigalgs, 0) == 1; |
| 258 | } |
| 259 | |
| 260 | char * |
| 261 | sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep) |
| 262 | { |
| 263 | char *tmp, *ret = NULL((void*)0); |
| 264 | size_t nlen, rlen = 0; |
| 265 | const struct keytype *kt; |
| 266 | |
| 267 | for (kt = keytypes; kt->type != -1; kt++) { |
| 268 | if (kt->name == NULL((void*)0)) |
| 269 | continue; |
| 270 | if (!include_sigonly && kt->sigonly) |
| 271 | continue; |
| 272 | if ((certs_only && !kt->cert) || (plain_only && kt->cert)) |
| 273 | continue; |
| 274 | if (ret != NULL((void*)0)) |
| 275 | ret[rlen++] = sep; |
| 276 | nlen = strlen(kt->name); |
| 277 | if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL((void*)0)) { |
| 278 | free(ret); |
| 279 | return NULL((void*)0); |
| 280 | } |
| 281 | ret = tmp; |
| 282 | memcpy(ret + rlen, kt->name, nlen + 1); |
| 283 | rlen += nlen; |
| 284 | } |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | int |
| 289 | sshkey_names_valid2(const char *names, int allow_wildcard) |
| 290 | { |
| 291 | char *s, *cp, *p; |
| 292 | const struct keytype *kt; |
| 293 | int type; |
| 294 | |
| 295 | if (names == NULL((void*)0) || strcmp(names, "") == 0) |
| 296 | return 0; |
| 297 | if ((s = cp = strdup(names)) == NULL((void*)0)) |
| 298 | return 0; |
| 299 | for ((p = strsep(&cp, ",")); p && *p != '\0'; |
| 300 | (p = strsep(&cp, ","))) { |
| 301 | type = sshkey_type_from_name(p); |
| 302 | if (type == KEY_UNSPEC) { |
| 303 | if (allow_wildcard) { |
| 304 | /* |
| 305 | * Try matching key types against the string. |
| 306 | * If any has a positive or negative match then |
| 307 | * the component is accepted. |
| 308 | */ |
| 309 | for (kt = keytypes; kt->type != -1; kt++) { |
| 310 | if (match_pattern_list(kt->name, |
| 311 | p, 0) != 0) |
| 312 | break; |
| 313 | } |
| 314 | if (kt->type != -1) |
| 315 | continue; |
| 316 | } |
| 317 | free(s); |
| 318 | return 0; |
| 319 | } |
| 320 | } |
| 321 | free(s); |
| 322 | return 1; |
| 323 | } |
| 324 | |
| 325 | u_int |
| 326 | sshkey_size(const struct sshkey *k) |
| 327 | { |
| 328 | #ifdef WITH_OPENSSL1 |
| 329 | const BIGNUM *rsa_n, *dsa_p; |
| 330 | #endif /* WITH_OPENSSL */ |
| 331 | |
| 332 | switch (k->type) { |
| 333 | #ifdef WITH_OPENSSL1 |
| 334 | case KEY_RSA: |
| 335 | case KEY_RSA_CERT: |
| 336 | if (k->rsa == NULL((void*)0)) |
| 337 | return 0; |
| 338 | RSA_get0_key(k->rsa, &rsa_n, NULL((void*)0), NULL((void*)0)); |
| 339 | return BN_num_bits(rsa_n); |
| 340 | case KEY_DSA: |
| 341 | case KEY_DSA_CERT: |
| 342 | if (k->dsa == NULL((void*)0)) |
| 343 | return 0; |
| 344 | DSA_get0_pqg(k->dsa, &dsa_p, NULL((void*)0), NULL((void*)0)); |
| 345 | return BN_num_bits(dsa_p); |
| 346 | case KEY_ECDSA: |
| 347 | case KEY_ECDSA_CERT: |
| 348 | case KEY_ECDSA_SK: |
| 349 | case KEY_ECDSA_SK_CERT: |
| 350 | return sshkey_curve_nid_to_bits(k->ecdsa_nid); |
| 351 | #endif /* WITH_OPENSSL */ |
| 352 | case KEY_ED25519: |
| 353 | case KEY_ED25519_CERT: |
| 354 | case KEY_ED25519_SK: |
| 355 | case KEY_ED25519_SK_CERT: |
| 356 | case KEY_XMSS: |
| 357 | case KEY_XMSS_CERT: |
| 358 | return 256; /* XXX */ |
| 359 | } |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | static int |
| 364 | sshkey_type_is_valid_ca(int type) |
| 365 | { |
| 366 | switch (type) { |
| 367 | case KEY_RSA: |
| 368 | case KEY_DSA: |
| 369 | case KEY_ECDSA: |
| 370 | case KEY_ECDSA_SK: |
| 371 | case KEY_ED25519: |
| 372 | case KEY_ED25519_SK: |
| 373 | case KEY_XMSS: |
| 374 | return 1; |
| 375 | default: |
| 376 | return 0; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | int |
| 381 | sshkey_is_cert(const struct sshkey *k) |
| 382 | { |
| 383 | if (k == NULL((void*)0)) |
| 384 | return 0; |
| 385 | return sshkey_type_is_cert(k->type); |
| 386 | } |
| 387 | |
| 388 | int |
| 389 | sshkey_is_sk(const struct sshkey *k) |
| 390 | { |
| 391 | if (k == NULL((void*)0)) |
| 392 | return 0; |
| 393 | switch (sshkey_type_plain(k->type)) { |
| 394 | case KEY_ECDSA_SK: |
| 395 | case KEY_ED25519_SK: |
| 396 | return 1; |
| 397 | default: |
| 398 | return 0; |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | /* Return the cert-less equivalent to a certified key type */ |
| 403 | int |
| 404 | sshkey_type_plain(int type) |
| 405 | { |
| 406 | switch (type) { |
| 407 | case KEY_RSA_CERT: |
| 408 | return KEY_RSA; |
| 409 | case KEY_DSA_CERT: |
| 410 | return KEY_DSA; |
| 411 | case KEY_ECDSA_CERT: |
| 412 | return KEY_ECDSA; |
| 413 | case KEY_ECDSA_SK_CERT: |
| 414 | return KEY_ECDSA_SK; |
| 415 | case KEY_ED25519_CERT: |
| 416 | return KEY_ED25519; |
| 417 | case KEY_ED25519_SK_CERT: |
| 418 | return KEY_ED25519_SK; |
| 419 | case KEY_XMSS_CERT: |
| 420 | return KEY_XMSS; |
| 421 | default: |
| 422 | return type; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | #ifdef WITH_OPENSSL1 |
| 427 | /* XXX: these are really begging for a table-driven approach */ |
| 428 | int |
| 429 | sshkey_curve_name_to_nid(const char *name) |
| 430 | { |
| 431 | if (strcmp(name, "nistp256") == 0) |
| 432 | return NID_X9_62_prime256v1415; |
| 433 | else if (strcmp(name, "nistp384") == 0) |
| 434 | return NID_secp384r1715; |
| 435 | else if (strcmp(name, "nistp521") == 0) |
| 436 | return NID_secp521r1716; |
| 437 | else |
| 438 | return -1; |
| 439 | } |
| 440 | |
| 441 | u_int |
| 442 | sshkey_curve_nid_to_bits(int nid) |
| 443 | { |
| 444 | switch (nid) { |
| 445 | case NID_X9_62_prime256v1415: |
| 446 | return 256; |
| 447 | case NID_secp384r1715: |
| 448 | return 384; |
| 449 | case NID_secp521r1716: |
| 450 | return 521; |
| 451 | default: |
| 452 | return 0; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | int |
| 457 | sshkey_ecdsa_bits_to_nid(int bits) |
| 458 | { |
| 459 | switch (bits) { |
| 460 | case 256: |
| 461 | return NID_X9_62_prime256v1415; |
| 462 | case 384: |
| 463 | return NID_secp384r1715; |
| 464 | case 521: |
| 465 | return NID_secp521r1716; |
| 466 | default: |
| 467 | return -1; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | const char * |
| 472 | sshkey_curve_nid_to_name(int nid) |
| 473 | { |
| 474 | switch (nid) { |
| 475 | case NID_X9_62_prime256v1415: |
| 476 | return "nistp256"; |
| 477 | case NID_secp384r1715: |
| 478 | return "nistp384"; |
| 479 | case NID_secp521r1716: |
| 480 | return "nistp521"; |
| 481 | default: |
| 482 | return NULL((void*)0); |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | int |
| 487 | sshkey_ec_nid_to_hash_alg(int nid) |
| 488 | { |
| 489 | int kbits = sshkey_curve_nid_to_bits(nid); |
| 490 | |
| 491 | if (kbits <= 0) |
| 492 | return -1; |
| 493 | |
| 494 | /* RFC5656 section 6.2.1 */ |
| 495 | if (kbits <= 256) |
| 496 | return SSH_DIGEST_SHA2562; |
| 497 | else if (kbits <= 384) |
| 498 | return SSH_DIGEST_SHA3843; |
| 499 | else |
| 500 | return SSH_DIGEST_SHA5124; |
| 501 | } |
| 502 | #endif /* WITH_OPENSSL */ |
| 503 | |
| 504 | static void |
| 505 | cert_free(struct sshkey_cert *cert) |
| 506 | { |
| 507 | u_int i; |
| 508 | |
| 509 | if (cert == NULL((void*)0)) |
| 510 | return; |
| 511 | sshbuf_free(cert->certblob); |
| 512 | sshbuf_free(cert->critical); |
| 513 | sshbuf_free(cert->extensions); |
| 514 | free(cert->key_id); |
| 515 | for (i = 0; i < cert->nprincipals; i++) |
| 516 | free(cert->principals[i]); |
| 517 | free(cert->principals); |
| 518 | sshkey_free(cert->signature_key); |
| 519 | free(cert->signature_type); |
| 520 | freezero(cert, sizeof(*cert)); |
| 521 | } |
| 522 | |
| 523 | static struct sshkey_cert * |
| 524 | cert_new(void) |
| 525 | { |
| 526 | struct sshkey_cert *cert; |
| 527 | |
| 528 | if ((cert = calloc(1, sizeof(*cert))) == NULL((void*)0)) |
| 529 | return NULL((void*)0); |
| 530 | if ((cert->certblob = sshbuf_new()) == NULL((void*)0) || |
| 531 | (cert->critical = sshbuf_new()) == NULL((void*)0) || |
| 532 | (cert->extensions = sshbuf_new()) == NULL((void*)0)) { |
| 533 | cert_free(cert); |
| 534 | return NULL((void*)0); |
| 535 | } |
| 536 | cert->key_id = NULL((void*)0); |
| 537 | cert->principals = NULL((void*)0); |
| 538 | cert->signature_key = NULL((void*)0); |
| 539 | cert->signature_type = NULL((void*)0); |
| 540 | return cert; |
| 541 | } |
| 542 | |
| 543 | struct sshkey * |
| 544 | sshkey_new(int type) |
| 545 | { |
| 546 | struct sshkey *k; |
| 547 | #ifdef WITH_OPENSSL1 |
| 548 | RSA *rsa; |
| 549 | DSA *dsa; |
| 550 | #endif /* WITH_OPENSSL */ |
| 551 | |
| 552 | if ((k = calloc(1, sizeof(*k))) == NULL((void*)0)) |
| 553 | return NULL((void*)0); |
| 554 | k->type = type; |
| 555 | k->ecdsa = NULL((void*)0); |
| 556 | k->ecdsa_nid = -1; |
| 557 | k->dsa = NULL((void*)0); |
| 558 | k->rsa = NULL((void*)0); |
| 559 | k->cert = NULL((void*)0); |
| 560 | k->ed25519_sk = NULL((void*)0); |
| 561 | k->ed25519_pk = NULL((void*)0); |
| 562 | k->xmss_sk = NULL((void*)0); |
| 563 | k->xmss_pk = NULL((void*)0); |
| 564 | switch (k->type) { |
| 565 | #ifdef WITH_OPENSSL1 |
| 566 | case KEY_RSA: |
| 567 | case KEY_RSA_CERT: |
| 568 | if ((rsa = RSA_new()) == NULL((void*)0)) { |
| 569 | free(k); |
| 570 | return NULL((void*)0); |
| 571 | } |
| 572 | k->rsa = rsa; |
| 573 | break; |
| 574 | case KEY_DSA: |
| 575 | case KEY_DSA_CERT: |
| 576 | if ((dsa = DSA_new()) == NULL((void*)0)) { |
| 577 | free(k); |
| 578 | return NULL((void*)0); |
| 579 | } |
| 580 | k->dsa = dsa; |
| 581 | break; |
| 582 | case KEY_ECDSA: |
| 583 | case KEY_ECDSA_CERT: |
| 584 | case KEY_ECDSA_SK: |
| 585 | case KEY_ECDSA_SK_CERT: |
| 586 | /* Cannot do anything until we know the group */ |
| 587 | break; |
| 588 | #endif /* WITH_OPENSSL */ |
| 589 | case KEY_ED25519: |
| 590 | case KEY_ED25519_CERT: |
| 591 | case KEY_ED25519_SK: |
| 592 | case KEY_ED25519_SK_CERT: |
| 593 | case KEY_XMSS: |
| 594 | case KEY_XMSS_CERT: |
| 595 | /* no need to prealloc */ |
| 596 | break; |
| 597 | case KEY_UNSPEC: |
| 598 | break; |
| 599 | default: |
| 600 | free(k); |
| 601 | return NULL((void*)0); |
| 602 | } |
| 603 | |
| 604 | if (sshkey_is_cert(k)) { |
| 605 | if ((k->cert = cert_new()) == NULL((void*)0)) { |
| 606 | sshkey_free(k); |
| 607 | return NULL((void*)0); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | return k; |
| 612 | } |
| 613 | |
| 614 | void |
| 615 | sshkey_free(struct sshkey *k) |
| 616 | { |
| 617 | if (k == NULL((void*)0)) |
| 618 | return; |
| 619 | switch (k->type) { |
| 620 | #ifdef WITH_OPENSSL1 |
| 621 | case KEY_RSA: |
| 622 | case KEY_RSA_CERT: |
| 623 | RSA_free(k->rsa); |
| 624 | k->rsa = NULL((void*)0); |
| 625 | break; |
| 626 | case KEY_DSA: |
| 627 | case KEY_DSA_CERT: |
| 628 | DSA_free(k->dsa); |
| 629 | k->dsa = NULL((void*)0); |
| 630 | break; |
| 631 | case KEY_ECDSA_SK: |
| 632 | case KEY_ECDSA_SK_CERT: |
| 633 | free(k->sk_application); |
| 634 | sshbuf_free(k->sk_key_handle); |
| 635 | sshbuf_free(k->sk_reserved); |
| 636 | /* FALLTHROUGH */ |
| 637 | case KEY_ECDSA: |
| 638 | case KEY_ECDSA_CERT: |
| 639 | EC_KEY_free(k->ecdsa); |
| 640 | k->ecdsa = NULL((void*)0); |
| 641 | break; |
| 642 | #endif /* WITH_OPENSSL */ |
| 643 | case KEY_ED25519_SK: |
| 644 | case KEY_ED25519_SK_CERT: |
| 645 | free(k->sk_application); |
| 646 | sshbuf_free(k->sk_key_handle); |
| 647 | sshbuf_free(k->sk_reserved); |
| 648 | /* FALLTHROUGH */ |
| 649 | case KEY_ED25519: |
| 650 | case KEY_ED25519_CERT: |
| 651 | freezero(k->ed25519_pk, ED25519_PK_SZ32U); |
| 652 | k->ed25519_pk = NULL((void*)0); |
| 653 | freezero(k->ed25519_sk, ED25519_SK_SZ64U); |
| 654 | k->ed25519_sk = NULL((void*)0); |
| 655 | break; |
| 656 | #ifdef WITH_XMSS |
| 657 | case KEY_XMSS: |
| 658 | case KEY_XMSS_CERT: |
| 659 | freezero(k->xmss_pk, sshkey_xmss_pklen(k)); |
| 660 | k->xmss_pk = NULL((void*)0); |
| 661 | freezero(k->xmss_sk, sshkey_xmss_sklen(k)); |
| 662 | k->xmss_sk = NULL((void*)0); |
| 663 | sshkey_xmss_free_state(k); |
| 664 | free(k->xmss_name); |
| 665 | k->xmss_name = NULL((void*)0); |
| 666 | free(k->xmss_filename); |
| 667 | k->xmss_filename = NULL((void*)0); |
| 668 | break; |
| 669 | #endif /* WITH_XMSS */ |
| 670 | case KEY_UNSPEC: |
| 671 | break; |
| 672 | default: |
| 673 | break; |
| 674 | } |
| 675 | if (sshkey_is_cert(k)) |
| 676 | cert_free(k->cert); |
| 677 | freezero(k->shielded_private, k->shielded_len); |
| 678 | freezero(k->shield_prekey, k->shield_prekey_len); |
| 679 | freezero(k, sizeof(*k)); |
| 680 | } |
| 681 | |
| 682 | static int |
| 683 | cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) |
| 684 | { |
| 685 | if (a == NULL((void*)0) && b == NULL((void*)0)) |
| 686 | return 1; |
| 687 | if (a == NULL((void*)0) || b == NULL((void*)0)) |
| 688 | return 0; |
| 689 | if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) |
| 690 | return 0; |
| 691 | if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), |
| 692 | sshbuf_len(a->certblob)) != 0) |
| 693 | return 0; |
| 694 | return 1; |
| 695 | } |
| 696 | |
| 697 | /* |
| 698 | * Compare public portions of key only, allowing comparisons between |
| 699 | * certificates and plain keys too. |
| 700 | */ |
| 701 | int |
| 702 | sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) |
| 703 | { |
| 704 | #ifdef WITH_OPENSSL1 |
| 705 | const BIGNUM *rsa_e_a, *rsa_n_a; |
| 706 | const BIGNUM *rsa_e_b, *rsa_n_b; |
| 707 | const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a; |
| 708 | const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b; |
| 709 | #endif /* WITH_OPENSSL */ |
| 710 | |
| 711 | if (a == NULL((void*)0) || b == NULL((void*)0) || |
| 712 | sshkey_type_plain(a->type) != sshkey_type_plain(b->type)) |
| 713 | return 0; |
| 714 | |
| 715 | switch (a->type) { |
| 716 | #ifdef WITH_OPENSSL1 |
| 717 | case KEY_RSA_CERT: |
| 718 | case KEY_RSA: |
| 719 | if (a->rsa == NULL((void*)0) || b->rsa == NULL((void*)0)) |
| 720 | return 0; |
| 721 | RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL((void*)0)); |
| 722 | RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL((void*)0)); |
| 723 | return BN_cmp(rsa_e_a, rsa_e_b) == 0 && |
| 724 | BN_cmp(rsa_n_a, rsa_n_b) == 0; |
| 725 | case KEY_DSA_CERT: |
| 726 | case KEY_DSA: |
| 727 | if (a->dsa == NULL((void*)0) || b->dsa == NULL((void*)0)) |
| 728 | return 0; |
| 729 | DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a); |
| 730 | DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b); |
| 731 | DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL((void*)0)); |
| 732 | DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL((void*)0)); |
| 733 | return BN_cmp(dsa_p_a, dsa_p_b) == 0 && |
| 734 | BN_cmp(dsa_q_a, dsa_q_b) == 0 && |
| 735 | BN_cmp(dsa_g_a, dsa_g_b) == 0 && |
| 736 | BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0; |
| 737 | case KEY_ECDSA_SK: |
| 738 | case KEY_ECDSA_SK_CERT: |
| 739 | if (a->sk_application == NULL((void*)0) || b->sk_application == NULL((void*)0)) |
| 740 | return 0; |
| 741 | if (strcmp(a->sk_application, b->sk_application) != 0) |
| 742 | return 0; |
| 743 | /* FALLTHROUGH */ |
| 744 | case KEY_ECDSA_CERT: |
| 745 | case KEY_ECDSA: |
| 746 | if (a->ecdsa == NULL((void*)0) || b->ecdsa == NULL((void*)0) || |
| 747 | EC_KEY_get0_public_key(a->ecdsa) == NULL((void*)0) || |
| 748 | EC_KEY_get0_public_key(b->ecdsa) == NULL((void*)0)) |
| 749 | return 0; |
| 750 | if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), |
| 751 | EC_KEY_get0_group(b->ecdsa), NULL((void*)0)) != 0 || |
| 752 | EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), |
| 753 | EC_KEY_get0_public_key(a->ecdsa), |
| 754 | EC_KEY_get0_public_key(b->ecdsa), NULL((void*)0)) != 0) |
| 755 | return 0; |
| 756 | return 1; |
| 757 | #endif /* WITH_OPENSSL */ |
| 758 | case KEY_ED25519_SK: |
| 759 | case KEY_ED25519_SK_CERT: |
| 760 | if (a->sk_application == NULL((void*)0) || b->sk_application == NULL((void*)0)) |
| 761 | return 0; |
| 762 | if (strcmp(a->sk_application, b->sk_application) != 0) |
| 763 | return 0; |
| 764 | /* FALLTHROUGH */ |
| 765 | case KEY_ED25519: |
| 766 | case KEY_ED25519_CERT: |
| 767 | return a->ed25519_pk != NULL((void*)0) && b->ed25519_pk != NULL((void*)0) && |
| 768 | memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ32U) == 0; |
| 769 | #ifdef WITH_XMSS |
| 770 | case KEY_XMSS: |
| 771 | case KEY_XMSS_CERT: |
| 772 | return a->xmss_pk != NULL((void*)0) && b->xmss_pk != NULL((void*)0) && |
| 773 | sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) && |
| 774 | memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0; |
| 775 | #endif /* WITH_XMSS */ |
| 776 | default: |
| 777 | return 0; |
| 778 | } |
| 779 | /* NOTREACHED */ |
| 780 | } |
| 781 | |
| 782 | int |
| 783 | sshkey_equal(const struct sshkey *a, const struct sshkey *b) |
| 784 | { |
| 785 | if (a == NULL((void*)0) || b == NULL((void*)0) || a->type != b->type) |
| 786 | return 0; |
| 787 | if (sshkey_is_cert(a)) { |
| 788 | if (!cert_compare(a->cert, b->cert)) |
| 789 | return 0; |
| 790 | } |
| 791 | return sshkey_equal_public(a, b); |
| 792 | } |
| 793 | |
| 794 | static int |
| 795 | to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain, |
| 796 | enum sshkey_serialize_rep opts) |
| 797 | { |
| 798 | int type, ret = SSH_ERR_INTERNAL_ERROR-1; |
| 799 | const char *typename; |
| 800 | #ifdef WITH_OPENSSL1 |
| 801 | const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| 802 | #endif /* WITH_OPENSSL */ |
| 803 | |
| 804 | if (key == NULL((void*)0)) |
| 805 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 806 | |
| 807 | if (sshkey_is_cert(key)) { |
| 808 | if (key->cert == NULL((void*)0)) |
| 809 | return SSH_ERR_EXPECTED_CERT-16; |
| 810 | if (sshbuf_len(key->cert->certblob) == 0) |
| 811 | return SSH_ERR_KEY_LACKS_CERTBLOB-17; |
| 812 | } |
| 813 | type = force_plain ? sshkey_type_plain(key->type) : key->type; |
| 814 | typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); |
| 815 | |
| 816 | switch (type) { |
| 817 | #ifdef WITH_OPENSSL1 |
| 818 | case KEY_DSA_CERT: |
| 819 | case KEY_ECDSA_CERT: |
| 820 | case KEY_ECDSA_SK_CERT: |
| 821 | case KEY_RSA_CERT: |
| 822 | #endif /* WITH_OPENSSL */ |
| 823 | case KEY_ED25519_CERT: |
| 824 | case KEY_ED25519_SK_CERT: |
| 825 | #ifdef WITH_XMSS |
| 826 | case KEY_XMSS_CERT: |
| 827 | #endif /* WITH_XMSS */ |
| 828 | /* Use the existing blob */ |
| 829 | /* XXX modified flag? */ |
| 830 | if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0) |
| 831 | return ret; |
| 832 | break; |
| 833 | #ifdef WITH_OPENSSL1 |
| 834 | case KEY_DSA: |
| 835 | if (key->dsa == NULL((void*)0)) |
| 836 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 837 | DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); |
| 838 | DSA_get0_key(key->dsa, &dsa_pub_key, NULL((void*)0)); |
| 839 | if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| 840 | (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 || |
| 841 | (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 || |
| 842 | (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 || |
| 843 | (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0) |
| 844 | return ret; |
| 845 | break; |
| 846 | case KEY_ECDSA: |
| 847 | case KEY_ECDSA_SK: |
| 848 | if (key->ecdsa == NULL((void*)0)) |
| 849 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 850 | if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| 851 | (ret = sshbuf_put_cstring(b, |
| 852 | sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| 853 | (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) |
| 854 | return ret; |
| 855 | if (type == KEY_ECDSA_SK) { |
| 856 | if ((ret = sshbuf_put_cstring(b, |
| 857 | key->sk_application)) != 0) |
| 858 | return ret; |
| 859 | } |
| 860 | break; |
| 861 | case KEY_RSA: |
| 862 | if (key->rsa == NULL((void*)0)) |
| 863 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 864 | RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL((void*)0)); |
| 865 | if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| 866 | (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 || |
| 867 | (ret = sshbuf_put_bignum2(b, rsa_n)) != 0) |
| 868 | return ret; |
| 869 | break; |
| 870 | #endif /* WITH_OPENSSL */ |
| 871 | case KEY_ED25519: |
| 872 | case KEY_ED25519_SK: |
| 873 | if (key->ed25519_pk == NULL((void*)0)) |
| 874 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 875 | if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| 876 | (ret = sshbuf_put_string(b, |
| 877 | key->ed25519_pk, ED25519_PK_SZ32U)) != 0) |
| 878 | return ret; |
| 879 | if (type == KEY_ED25519_SK) { |
| 880 | if ((ret = sshbuf_put_cstring(b, |
| 881 | key->sk_application)) != 0) |
| 882 | return ret; |
| 883 | } |
| 884 | break; |
| 885 | #ifdef WITH_XMSS |
| 886 | case KEY_XMSS: |
| 887 | if (key->xmss_name == NULL((void*)0) || key->xmss_pk == NULL((void*)0) || |
| 888 | sshkey_xmss_pklen(key) == 0) |
| 889 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 890 | if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| 891 | (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| 892 | (ret = sshbuf_put_string(b, |
| 893 | key->xmss_pk, sshkey_xmss_pklen(key))) != 0 || |
| 894 | (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0) |
| 895 | return ret; |
| 896 | break; |
| 897 | #endif /* WITH_XMSS */ |
| 898 | default: |
| 899 | return SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 900 | } |
| 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | int |
| 905 | sshkey_putb(const struct sshkey *key, struct sshbuf *b) |
| 906 | { |
| 907 | return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT); |
| 908 | } |
| 909 | |
| 910 | int |
| 911 | sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b, |
| 912 | enum sshkey_serialize_rep opts) |
| 913 | { |
| 914 | struct sshbuf *tmp; |
| 915 | int r; |
| 916 | |
| 917 | if ((tmp = sshbuf_new()) == NULL((void*)0)) |
| 918 | return SSH_ERR_ALLOC_FAIL-2; |
| 919 | r = to_blob_buf(key, tmp, 0, opts); |
| 920 | if (r == 0) |
| 921 | r = sshbuf_put_stringb(b, tmp); |
| 922 | sshbuf_free(tmp); |
| 923 | return r; |
| 924 | } |
| 925 | |
| 926 | int |
| 927 | sshkey_puts(const struct sshkey *key, struct sshbuf *b) |
| 928 | { |
| 929 | return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT); |
| 930 | } |
| 931 | |
| 932 | int |
| 933 | sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) |
| 934 | { |
| 935 | return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT); |
| 936 | } |
| 937 | |
| 938 | static int |
| 939 | to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain, |
| 940 | enum sshkey_serialize_rep opts) |
| 941 | { |
| 942 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 943 | size_t len; |
| 944 | struct sshbuf *b = NULL((void*)0); |
| 945 | |
| 946 | if (lenp != NULL((void*)0)) |
| 947 | *lenp = 0; |
| 948 | if (blobp != NULL((void*)0)) |
| 949 | *blobp = NULL((void*)0); |
| 950 | if ((b = sshbuf_new()) == NULL((void*)0)) |
| 951 | return SSH_ERR_ALLOC_FAIL-2; |
| 952 | if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0) |
| 953 | goto out; |
| 954 | len = sshbuf_len(b); |
| 955 | if (lenp != NULL((void*)0)) |
| 956 | *lenp = len; |
| 957 | if (blobp != NULL((void*)0)) { |
| 958 | if ((*blobp = malloc(len)) == NULL((void*)0)) { |
| 959 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 960 | goto out; |
| 961 | } |
| 962 | memcpy(*blobp, sshbuf_ptr(b), len); |
| 963 | } |
| 964 | ret = 0; |
| 965 | out: |
| 966 | sshbuf_free(b); |
| 967 | return ret; |
| 968 | } |
| 969 | |
| 970 | int |
| 971 | sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| 972 | { |
| 973 | return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT); |
| 974 | } |
| 975 | |
| 976 | int |
| 977 | sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| 978 | { |
| 979 | return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT); |
| 980 | } |
| 981 | |
| 982 | int |
| 983 | sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, |
| 984 | u_char **retp, size_t *lenp) |
| 985 | { |
| 986 | u_char *blob = NULL((void*)0), *ret = NULL((void*)0); |
| 987 | size_t blob_len = 0; |
| 988 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 989 | |
| 990 | if (retp != NULL((void*)0)) |
| 991 | *retp = NULL((void*)0); |
| 992 | if (lenp != NULL((void*)0)) |
| 993 | *lenp = 0; |
| 994 | if (ssh_digest_bytes(dgst_alg) == 0) { |
| 995 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 996 | goto out; |
| 997 | } |
| 998 | if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT)) |
| 999 | != 0) |
| 1000 | goto out; |
| 1001 | if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH64)) == NULL((void*)0)) { |
| 1002 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1003 | goto out; |
| 1004 | } |
| 1005 | if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, |
| 1006 | ret, SSH_DIGEST_MAX_LENGTH64)) != 0) |
| 1007 | goto out; |
| 1008 | /* success */ |
| 1009 | if (retp != NULL((void*)0)) { |
| 1010 | *retp = ret; |
| 1011 | ret = NULL((void*)0); |
| 1012 | } |
| 1013 | if (lenp != NULL((void*)0)) |
| 1014 | *lenp = ssh_digest_bytes(dgst_alg); |
| 1015 | r = 0; |
| 1016 | out: |
| 1017 | free(ret); |
| 1018 | if (blob != NULL((void*)0)) |
| 1019 | freezero(blob, blob_len); |
| 1020 | return r; |
| 1021 | } |
| 1022 | |
| 1023 | static char * |
| 1024 | fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| 1025 | { |
| 1026 | char *ret; |
| 1027 | size_t plen = strlen(alg) + 1; |
| 1028 | size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; |
| 1029 | |
| 1030 | if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL((void*)0)) |
| 1031 | return NULL((void*)0); |
| 1032 | strlcpy(ret, alg, rlen); |
| 1033 | strlcat(ret, ":", rlen); |
| 1034 | if (dgst_raw_len == 0) |
| 1035 | return ret; |
| 1036 | if (b64_ntop__b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) { |
| 1037 | freezero(ret, rlen); |
| 1038 | return NULL((void*)0); |
| 1039 | } |
| 1040 | /* Trim padding characters from end */ |
| 1041 | ret[strcspn(ret, "=")] = '\0'; |
| 1042 | return ret; |
| 1043 | } |
| 1044 | |
| 1045 | static char * |
| 1046 | fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| 1047 | { |
| 1048 | char *retval, hex[5]; |
| 1049 | size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; |
| 1050 | |
| 1051 | if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL((void*)0)) |
| 1052 | return NULL((void*)0); |
| 1053 | strlcpy(retval, alg, rlen); |
| 1054 | strlcat(retval, ":", rlen); |
| 1055 | for (i = 0; i < dgst_raw_len; i++) { |
| 1056 | snprintf(hex, sizeof(hex), "%s%02x", |
| 1057 | i > 0 ? ":" : "", dgst_raw[i]); |
| 1058 | strlcat(retval, hex, rlen); |
| 1059 | } |
| 1060 | return retval; |
| 1061 | } |
| 1062 | |
| 1063 | static char * |
| 1064 | fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) |
| 1065 | { |
| 1066 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; |
| 1067 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', |
| 1068 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; |
| 1069 | u_int i, j = 0, rounds, seed = 1; |
| 1070 | char *retval; |
| 1071 | |
| 1072 | rounds = (dgst_raw_len / 2) + 1; |
| 1073 | if ((retval = calloc(rounds, 6)) == NULL((void*)0)) |
| 1074 | return NULL((void*)0); |
| 1075 | retval[j++] = 'x'; |
| 1076 | for (i = 0; i < rounds; i++) { |
| 1077 | u_int idx0, idx1, idx2, idx3, idx4; |
| 1078 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
| 1079 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + |
| 1080 | seed) % 6; |
| 1081 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
| 1082 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + |
| 1083 | (seed / 6)) % 6; |
| 1084 | retval[j++] = vowels[idx0]; |
| 1085 | retval[j++] = consonants[idx1]; |
| 1086 | retval[j++] = vowels[idx2]; |
| 1087 | if ((i + 1) < rounds) { |
| 1088 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; |
| 1089 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; |
| 1090 | retval[j++] = consonants[idx3]; |
| 1091 | retval[j++] = '-'; |
| 1092 | retval[j++] = consonants[idx4]; |
| 1093 | seed = ((seed * 5) + |
| 1094 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
| 1095 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; |
| 1096 | } |
| 1097 | } else { |
| 1098 | idx0 = seed % 6; |
| 1099 | idx1 = 16; |
| 1100 | idx2 = seed / 6; |
| 1101 | retval[j++] = vowels[idx0]; |
| 1102 | retval[j++] = consonants[idx1]; |
| 1103 | retval[j++] = vowels[idx2]; |
| 1104 | } |
| 1105 | } |
| 1106 | retval[j++] = 'x'; |
| 1107 | retval[j++] = '\0'; |
| 1108 | return retval; |
| 1109 | } |
| 1110 | |
| 1111 | /* |
| 1112 | * Draw an ASCII-Art representing the fingerprint so human brain can |
| 1113 | * profit from its built-in pattern recognition ability. |
| 1114 | * This technique is called "random art" and can be found in some |
| 1115 | * scientific publications like this original paper: |
| 1116 | * |
| 1117 | * "Hash Visualization: a New Technique to improve Real-World Security", |
| 1118 | * Perrig A. and Song D., 1999, International Workshop on Cryptographic |
| 1119 | * Techniques and E-Commerce (CrypTEC '99) |
| 1120 | * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf |
| 1121 | * |
| 1122 | * The subject came up in a talk by Dan Kaminsky, too. |
| 1123 | * |
| 1124 | * If you see the picture is different, the key is different. |
| 1125 | * If the picture looks the same, you still know nothing. |
| 1126 | * |
| 1127 | * The algorithm used here is a worm crawling over a discrete plane, |
| 1128 | * leaving a trace (augmenting the field) everywhere it goes. |
| 1129 | * Movement is taken from dgst_raw 2bit-wise. Bumping into walls |
| 1130 | * makes the respective movement vector be ignored for this turn. |
| 1131 | * Graphs are not unambiguous, because circles in graphs can be |
| 1132 | * walked in either direction. |
| 1133 | */ |
| 1134 | |
| 1135 | /* |
| 1136 | * Field sizes for the random art. Have to be odd, so the starting point |
| 1137 | * can be in the exact middle of the picture, and FLDBASE should be >=8 . |
| 1138 | * Else pictures would be too dense, and drawing the frame would |
| 1139 | * fail, too, because the key type would not fit in anymore. |
| 1140 | */ |
| 1141 | #define FLDBASE8 8 |
| 1142 | #define FLDSIZE_Y(8 + 1) (FLDBASE8 + 1) |
| 1143 | #define FLDSIZE_X(8 * 2 + 1) (FLDBASE8 * 2 + 1) |
| 1144 | static char * |
| 1145 | fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, |
| 1146 | const struct sshkey *k) |
| 1147 | { |
| 1148 | /* |
| 1149 | * Chars to be used after each other every time the worm |
| 1150 | * intersects with itself. Matter of taste. |
| 1151 | */ |
| 1152 | char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
| 1153 | char *retval, *p, title[FLDSIZE_X(8 * 2 + 1)], hash[FLDSIZE_X(8 * 2 + 1)]; |
| 1154 | u_char field[FLDSIZE_X(8 * 2 + 1)][FLDSIZE_Y(8 + 1)]; |
| 1155 | size_t i, tlen, hlen; |
| 1156 | u_int b; |
| 1157 | int x, y, r; |
| 1158 | size_t len = strlen(augmentation_string) - 1; |
| 1159 | |
| 1160 | if ((retval = calloc((FLDSIZE_X(8 * 2 + 1) + 3), (FLDSIZE_Y(8 + 1) + 2))) == NULL((void*)0)) |
| 1161 | return NULL((void*)0); |
| 1162 | |
| 1163 | /* initialize field */ |
| 1164 | memset(field, 0, FLDSIZE_X(8 * 2 + 1) * FLDSIZE_Y(8 + 1) * sizeof(char)); |
| 1165 | x = FLDSIZE_X(8 * 2 + 1) / 2; |
| 1166 | y = FLDSIZE_Y(8 + 1) / 2; |
| 1167 | |
| 1168 | /* process raw key */ |
| 1169 | for (i = 0; i < dgst_raw_len; i++) { |
| 1170 | int input; |
| 1171 | /* each byte conveys four 2-bit move commands */ |
| 1172 | input = dgst_raw[i]; |
| 1173 | for (b = 0; b < 4; b++) { |
| 1174 | /* evaluate 2 bit, rest is shifted later */ |
| 1175 | x += (input & 0x1) ? 1 : -1; |
| 1176 | y += (input & 0x2) ? 1 : -1; |
| 1177 | |
| 1178 | /* assure we are still in bounds */ |
| 1179 | x = MAXIMUM(x, 0)(((x) > (0)) ? (x) : (0)); |
| 1180 | y = MAXIMUM(y, 0)(((y) > (0)) ? (y) : (0)); |
| 1181 | x = MINIMUM(x, FLDSIZE_X - 1)(((x) < ((8 * 2 + 1) - 1)) ? (x) : ((8 * 2 + 1) - 1)); |
| 1182 | y = MINIMUM(y, FLDSIZE_Y - 1)(((y) < ((8 + 1) - 1)) ? (y) : ((8 + 1) - 1)); |
| 1183 | |
| 1184 | /* augment the field */ |
| 1185 | if (field[x][y] < len - 2) |
| 1186 | field[x][y]++; |
| 1187 | input = input >> 2; |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | /* mark starting point and end point*/ |
| 1192 | field[FLDSIZE_X(8 * 2 + 1) / 2][FLDSIZE_Y(8 + 1) / 2] = len - 1; |
| 1193 | field[x][y] = len; |
| 1194 | |
| 1195 | /* assemble title */ |
| 1196 | r = snprintf(title, sizeof(title), "[%s %u]", |
| 1197 | sshkey_type(k), sshkey_size(k)); |
| 1198 | /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ |
| 1199 | if (r < 0 || r > (int)sizeof(title)) |
| 1200 | r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); |
| 1201 | tlen = (r <= 0) ? 0 : strlen(title); |
| 1202 | |
| 1203 | /* assemble hash ID. */ |
| 1204 | r = snprintf(hash, sizeof(hash), "[%s]", alg); |
| 1205 | hlen = (r <= 0) ? 0 : strlen(hash); |
| 1206 | |
| 1207 | /* output upper border */ |
| 1208 | p = retval; |
| 1209 | *p++ = '+'; |
| 1210 | for (i = 0; i < (FLDSIZE_X(8 * 2 + 1) - tlen) / 2; i++) |
| 1211 | *p++ = '-'; |
| 1212 | memcpy(p, title, tlen); |
| 1213 | p += tlen; |
| 1214 | for (i += tlen; i < FLDSIZE_X(8 * 2 + 1); i++) |
| 1215 | *p++ = '-'; |
| 1216 | *p++ = '+'; |
| 1217 | *p++ = '\n'; |
| 1218 | |
| 1219 | /* output content */ |
| 1220 | for (y = 0; y < FLDSIZE_Y(8 + 1); y++) { |
| 1221 | *p++ = '|'; |
| 1222 | for (x = 0; x < FLDSIZE_X(8 * 2 + 1); x++) |
| 1223 | *p++ = augmentation_string[MINIMUM(field[x][y], len)(((field[x][y]) < (len)) ? (field[x][y]) : (len))]; |
| 1224 | *p++ = '|'; |
| 1225 | *p++ = '\n'; |
| 1226 | } |
| 1227 | |
| 1228 | /* output lower border */ |
| 1229 | *p++ = '+'; |
| 1230 | for (i = 0; i < (FLDSIZE_X(8 * 2 + 1) - hlen) / 2; i++) |
| 1231 | *p++ = '-'; |
| 1232 | memcpy(p, hash, hlen); |
| 1233 | p += hlen; |
| 1234 | for (i += hlen; i < FLDSIZE_X(8 * 2 + 1); i++) |
| 1235 | *p++ = '-'; |
| 1236 | *p++ = '+'; |
| 1237 | |
| 1238 | return retval; |
| 1239 | } |
| 1240 | |
| 1241 | char * |
| 1242 | sshkey_fingerprint(const struct sshkey *k, int dgst_alg, |
| 1243 | enum sshkey_fp_rep dgst_rep) |
| 1244 | { |
| 1245 | char *retval = NULL((void*)0); |
| 1246 | u_char *dgst_raw; |
| 1247 | size_t dgst_raw_len; |
| 1248 | |
| 1249 | if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) |
| 1250 | return NULL((void*)0); |
| 1251 | switch (dgst_rep) { |
| 1252 | case SSH_FP_DEFAULT: |
| 1253 | if (dgst_alg == SSH_DIGEST_MD50) { |
| 1254 | retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| 1255 | dgst_raw, dgst_raw_len); |
| 1256 | } else { |
| 1257 | retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| 1258 | dgst_raw, dgst_raw_len); |
| 1259 | } |
| 1260 | break; |
| 1261 | case SSH_FP_HEX: |
| 1262 | retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| 1263 | dgst_raw, dgst_raw_len); |
| 1264 | break; |
| 1265 | case SSH_FP_BASE64: |
| 1266 | retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| 1267 | dgst_raw, dgst_raw_len); |
| 1268 | break; |
| 1269 | case SSH_FP_BUBBLEBABBLE: |
| 1270 | retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); |
| 1271 | break; |
| 1272 | case SSH_FP_RANDOMART: |
| 1273 | retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), |
| 1274 | dgst_raw, dgst_raw_len, k); |
| 1275 | break; |
| 1276 | default: |
| 1277 | freezero(dgst_raw, dgst_raw_len); |
| 1278 | return NULL((void*)0); |
| 1279 | } |
| 1280 | freezero(dgst_raw, dgst_raw_len); |
| 1281 | return retval; |
| 1282 | } |
| 1283 | |
| 1284 | static int |
| 1285 | peek_type_nid(const char *s, size_t l, int *nid) |
| 1286 | { |
| 1287 | const struct keytype *kt; |
| 1288 | |
| 1289 | for (kt = keytypes; kt->type != -1; kt++) { |
| 1290 | if (kt->name == NULL((void*)0) || strlen(kt->name) != l) |
| 1291 | continue; |
| 1292 | if (memcmp(s, kt->name, l) == 0) { |
| 1293 | *nid = -1; |
| 1294 | if (key_type_is_ecdsa_variant(kt->type)) |
| 1295 | *nid = kt->nid; |
| 1296 | return kt->type; |
| 1297 | } |
| 1298 | } |
| 1299 | return KEY_UNSPEC; |
| 1300 | } |
| 1301 | |
| 1302 | /* XXX this can now be made const char * */ |
| 1303 | int |
| 1304 | sshkey_read(struct sshkey *ret, char **cpp) |
| 1305 | { |
| 1306 | struct sshkey *k; |
| 1307 | char *cp, *blobcopy; |
| 1308 | size_t space; |
| 1309 | int r, type, curve_nid = -1; |
| 1310 | struct sshbuf *blob; |
| 1311 | |
| 1312 | if (ret == NULL((void*)0)) |
| 1313 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1314 | |
| 1315 | switch (ret->type) { |
| 1316 | case KEY_UNSPEC: |
| 1317 | case KEY_RSA: |
| 1318 | case KEY_DSA: |
| 1319 | case KEY_ECDSA: |
| 1320 | case KEY_ECDSA_SK: |
| 1321 | case KEY_ED25519: |
| 1322 | case KEY_ED25519_SK: |
| 1323 | case KEY_DSA_CERT: |
| 1324 | case KEY_ECDSA_CERT: |
| 1325 | case KEY_ECDSA_SK_CERT: |
| 1326 | case KEY_RSA_CERT: |
| 1327 | case KEY_ED25519_CERT: |
| 1328 | case KEY_ED25519_SK_CERT: |
| 1329 | #ifdef WITH_XMSS |
| 1330 | case KEY_XMSS: |
| 1331 | case KEY_XMSS_CERT: |
| 1332 | #endif /* WITH_XMSS */ |
| 1333 | break; /* ok */ |
| 1334 | default: |
| 1335 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1336 | } |
| 1337 | |
| 1338 | /* Decode type */ |
| 1339 | cp = *cpp; |
| 1340 | space = strcspn(cp, " \t"); |
| 1341 | if (space == strlen(cp)) |
| 1342 | return SSH_ERR_INVALID_FORMAT-4; |
| 1343 | if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC) |
| 1344 | return SSH_ERR_INVALID_FORMAT-4; |
| 1345 | |
| 1346 | /* skip whitespace */ |
| 1347 | for (cp += space; *cp == ' ' || *cp == '\t'; cp++) |
| 1348 | ; |
| 1349 | if (*cp == '\0') |
| 1350 | return SSH_ERR_INVALID_FORMAT-4; |
| 1351 | if (ret->type != KEY_UNSPEC && ret->type != type) |
| 1352 | return SSH_ERR_KEY_TYPE_MISMATCH-13; |
| 1353 | if ((blob = sshbuf_new()) == NULL((void*)0)) |
| 1354 | return SSH_ERR_ALLOC_FAIL-2; |
| 1355 | |
| 1356 | /* find end of keyblob and decode */ |
| 1357 | space = strcspn(cp, " \t"); |
| 1358 | if ((blobcopy = strndup(cp, space)) == NULL((void*)0)) { |
| 1359 | sshbuf_free(blob); |
| 1360 | return SSH_ERR_ALLOC_FAIL-2; |
| 1361 | } |
| 1362 | if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) { |
| 1363 | free(blobcopy); |
| 1364 | sshbuf_free(blob); |
| 1365 | return r; |
| 1366 | } |
| 1367 | free(blobcopy); |
| 1368 | if ((r = sshkey_fromb(blob, &k)) != 0) { |
| 1369 | sshbuf_free(blob); |
| 1370 | return r; |
| 1371 | } |
| 1372 | sshbuf_free(blob); |
| 1373 | |
| 1374 | /* skip whitespace and leave cp at start of comment */ |
| 1375 | for (cp += space; *cp == ' ' || *cp == '\t'; cp++) |
| 1376 | ; |
| 1377 | |
| 1378 | /* ensure type of blob matches type at start of line */ |
| 1379 | if (k->type != type) { |
| 1380 | sshkey_free(k); |
| 1381 | return SSH_ERR_KEY_TYPE_MISMATCH-13; |
| 1382 | } |
| 1383 | if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) { |
| 1384 | sshkey_free(k); |
| 1385 | return SSH_ERR_EC_CURVE_MISMATCH-15; |
| 1386 | } |
| 1387 | |
| 1388 | /* Fill in ret from parsed key */ |
| 1389 | ret->type = type; |
| 1390 | if (sshkey_is_cert(ret)) { |
| 1391 | if (!sshkey_is_cert(k)) { |
| 1392 | sshkey_free(k); |
| 1393 | return SSH_ERR_EXPECTED_CERT-16; |
| 1394 | } |
| 1395 | if (ret->cert != NULL((void*)0)) |
| 1396 | cert_free(ret->cert); |
| 1397 | ret->cert = k->cert; |
| 1398 | k->cert = NULL((void*)0); |
| 1399 | } |
| 1400 | switch (sshkey_type_plain(ret->type)) { |
| 1401 | #ifdef WITH_OPENSSL1 |
| 1402 | case KEY_RSA: |
| 1403 | RSA_free(ret->rsa); |
| 1404 | ret->rsa = k->rsa; |
| 1405 | k->rsa = NULL((void*)0); |
| 1406 | #ifdef DEBUG_PK |
| 1407 | RSA_print_fp(stderr(&__sF[2]), ret->rsa, 8); |
| 1408 | #endif |
| 1409 | break; |
| 1410 | case KEY_DSA: |
| 1411 | DSA_free(ret->dsa); |
| 1412 | ret->dsa = k->dsa; |
| 1413 | k->dsa = NULL((void*)0); |
| 1414 | #ifdef DEBUG_PK |
| 1415 | DSA_print_fp(stderr(&__sF[2]), ret->dsa, 8); |
| 1416 | #endif |
| 1417 | break; |
| 1418 | case KEY_ECDSA: |
| 1419 | EC_KEY_free(ret->ecdsa); |
| 1420 | ret->ecdsa = k->ecdsa; |
| 1421 | ret->ecdsa_nid = k->ecdsa_nid; |
| 1422 | k->ecdsa = NULL((void*)0); |
| 1423 | k->ecdsa_nid = -1; |
| 1424 | #ifdef DEBUG_PK |
| 1425 | sshkey_dump_ec_key(ret->ecdsa); |
| 1426 | #endif |
| 1427 | break; |
| 1428 | case KEY_ECDSA_SK: |
| 1429 | EC_KEY_free(ret->ecdsa); |
| 1430 | ret->ecdsa = k->ecdsa; |
| 1431 | ret->ecdsa_nid = k->ecdsa_nid; |
| 1432 | ret->sk_application = k->sk_application; |
| 1433 | k->ecdsa = NULL((void*)0); |
| 1434 | k->ecdsa_nid = -1; |
| 1435 | k->sk_application = NULL((void*)0); |
| 1436 | #ifdef DEBUG_PK |
| 1437 | sshkey_dump_ec_key(ret->ecdsa); |
| 1438 | fprintf(stderr(&__sF[2]), "App: %s\n", ret->sk_application); |
| 1439 | #endif |
| 1440 | break; |
| 1441 | #endif /* WITH_OPENSSL */ |
| 1442 | case KEY_ED25519: |
| 1443 | freezero(ret->ed25519_pk, ED25519_PK_SZ32U); |
| 1444 | ret->ed25519_pk = k->ed25519_pk; |
| 1445 | k->ed25519_pk = NULL((void*)0); |
| 1446 | #ifdef DEBUG_PK |
| 1447 | /* XXX */ |
| 1448 | #endif |
| 1449 | break; |
| 1450 | case KEY_ED25519_SK: |
| 1451 | freezero(ret->ed25519_pk, ED25519_PK_SZ32U); |
| 1452 | ret->ed25519_pk = k->ed25519_pk; |
| 1453 | ret->sk_application = k->sk_application; |
| 1454 | k->ed25519_pk = NULL((void*)0); |
| 1455 | k->sk_application = NULL((void*)0); |
| 1456 | break; |
| 1457 | #ifdef WITH_XMSS |
| 1458 | case KEY_XMSS: |
| 1459 | free(ret->xmss_pk); |
| 1460 | ret->xmss_pk = k->xmss_pk; |
| 1461 | k->xmss_pk = NULL((void*)0); |
| 1462 | free(ret->xmss_state); |
| 1463 | ret->xmss_state = k->xmss_state; |
| 1464 | k->xmss_state = NULL((void*)0); |
| 1465 | free(ret->xmss_name); |
| 1466 | ret->xmss_name = k->xmss_name; |
| 1467 | k->xmss_name = NULL((void*)0); |
| 1468 | free(ret->xmss_filename); |
| 1469 | ret->xmss_filename = k->xmss_filename; |
| 1470 | k->xmss_filename = NULL((void*)0); |
| 1471 | #ifdef DEBUG_PK |
| 1472 | /* XXX */ |
| 1473 | #endif |
| 1474 | break; |
| 1475 | #endif /* WITH_XMSS */ |
| 1476 | default: |
| 1477 | sshkey_free(k); |
| 1478 | return SSH_ERR_INTERNAL_ERROR-1; |
| 1479 | } |
| 1480 | sshkey_free(k); |
| 1481 | |
| 1482 | /* success */ |
| 1483 | *cpp = cp; |
| 1484 | return 0; |
| 1485 | } |
| 1486 | |
| 1487 | int |
| 1488 | sshkey_to_base64(const struct sshkey *key, char **b64p) |
| 1489 | { |
| 1490 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1491 | struct sshbuf *b = NULL((void*)0); |
| 1492 | char *uu = NULL((void*)0); |
| 1493 | |
| 1494 | if (b64p != NULL((void*)0)) |
| 1495 | *b64p = NULL((void*)0); |
| 1496 | if ((b = sshbuf_new()) == NULL((void*)0)) |
| 1497 | return SSH_ERR_ALLOC_FAIL-2; |
| 1498 | if ((r = sshkey_putb(key, b)) != 0) |
| 1499 | goto out; |
| 1500 | if ((uu = sshbuf_dtob64_string(b, 0)) == NULL((void*)0)) { |
| 1501 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1502 | goto out; |
| 1503 | } |
| 1504 | /* Success */ |
| 1505 | if (b64p != NULL((void*)0)) { |
| 1506 | *b64p = uu; |
| 1507 | uu = NULL((void*)0); |
| 1508 | } |
| 1509 | r = 0; |
| 1510 | out: |
| 1511 | sshbuf_free(b); |
| 1512 | free(uu); |
| 1513 | return r; |
| 1514 | } |
| 1515 | |
| 1516 | int |
| 1517 | sshkey_format_text(const struct sshkey *key, struct sshbuf *b) |
| 1518 | { |
| 1519 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1520 | char *uu = NULL((void*)0); |
| 1521 | |
| 1522 | if ((r = sshkey_to_base64(key, &uu)) != 0) |
| 1523 | goto out; |
| 1524 | if ((r = sshbuf_putf(b, "%s %s", |
| 1525 | sshkey_ssh_name(key), uu)) != 0) |
| 1526 | goto out; |
| 1527 | r = 0; |
| 1528 | out: |
| 1529 | free(uu); |
| 1530 | return r; |
| 1531 | } |
| 1532 | |
| 1533 | int |
| 1534 | sshkey_write(const struct sshkey *key, FILE *f) |
| 1535 | { |
| 1536 | struct sshbuf *b = NULL((void*)0); |
| 1537 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1538 | |
| 1539 | if ((b = sshbuf_new()) == NULL((void*)0)) |
| 1540 | return SSH_ERR_ALLOC_FAIL-2; |
| 1541 | if ((r = sshkey_format_text(key, b)) != 0) |
| 1542 | goto out; |
| 1543 | if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { |
| 1544 | if (feof(f)(!__isthreaded ? (((f)->_flags & 0x0020) != 0) : (feof )(f))) |
| 1545 | errno(*__errno()) = EPIPE32; |
| 1546 | r = SSH_ERR_SYSTEM_ERROR-24; |
| 1547 | goto out; |
| 1548 | } |
| 1549 | /* Success */ |
| 1550 | r = 0; |
| 1551 | out: |
| 1552 | sshbuf_free(b); |
| 1553 | return r; |
| 1554 | } |
| 1555 | |
| 1556 | const char * |
| 1557 | sshkey_cert_type(const struct sshkey *k) |
| 1558 | { |
| 1559 | switch (k->cert->type) { |
| 1560 | case SSH2_CERT_TYPE_USER1: |
| 1561 | return "user"; |
| 1562 | case SSH2_CERT_TYPE_HOST2: |
| 1563 | return "host"; |
| 1564 | default: |
| 1565 | return "unknown"; |
| 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | #ifdef WITH_OPENSSL1 |
| 1570 | static int |
| 1571 | rsa_generate_private_key(u_int bits, RSA **rsap) |
| 1572 | { |
| 1573 | RSA *private = NULL((void*)0); |
| 1574 | BIGNUM *f4 = NULL((void*)0); |
| 1575 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 1576 | |
| 1577 | if (rsap == NULL((void*)0)) |
| 1578 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1579 | if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE1024 || |
| 1580 | bits > SSHBUF_MAX_BIGNUM(16384 / 8) * 8) |
| 1581 | return SSH_ERR_KEY_LENGTH-56; |
| 1582 | *rsap = NULL((void*)0); |
| 1583 | if ((private = RSA_new()) == NULL((void*)0) || (f4 = BN_new()) == NULL((void*)0)) { |
| 1584 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 1585 | goto out; |
| 1586 | } |
| 1587 | if (!BN_set_word(f4, RSA_F40x10001L) || |
| 1588 | !RSA_generate_key_ex(private, bits, f4, NULL((void*)0))) { |
| 1589 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1590 | goto out; |
| 1591 | } |
| 1592 | *rsap = private; |
| 1593 | private = NULL((void*)0); |
| 1594 | ret = 0; |
| 1595 | out: |
| 1596 | RSA_free(private); |
| 1597 | BN_free(f4); |
| 1598 | return ret; |
| 1599 | } |
| 1600 | |
| 1601 | static int |
| 1602 | dsa_generate_private_key(u_int bits, DSA **dsap) |
| 1603 | { |
| 1604 | DSA *private; |
| 1605 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 1606 | |
| 1607 | if (dsap == NULL((void*)0)) |
| 1608 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1609 | if (bits != 1024) |
| 1610 | return SSH_ERR_KEY_LENGTH-56; |
| 1611 | if ((private = DSA_new()) == NULL((void*)0)) { |
| 1612 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 1613 | goto out; |
| 1614 | } |
| 1615 | *dsap = NULL((void*)0); |
| 1616 | if (!DSA_generate_parameters_ex(private, bits, NULL((void*)0), 0, NULL((void*)0), |
| 1617 | NULL((void*)0), NULL((void*)0)) || !DSA_generate_key(private)) { |
| 1618 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1619 | goto out; |
| 1620 | } |
| 1621 | *dsap = private; |
| 1622 | private = NULL((void*)0); |
| 1623 | ret = 0; |
| 1624 | out: |
| 1625 | DSA_free(private); |
| 1626 | return ret; |
| 1627 | } |
| 1628 | |
| 1629 | int |
| 1630 | sshkey_ecdsa_key_to_nid(EC_KEY *k) |
| 1631 | { |
| 1632 | EC_GROUP *eg; |
| 1633 | int nids[] = { |
| 1634 | NID_X9_62_prime256v1415, |
| 1635 | NID_secp384r1715, |
| 1636 | NID_secp521r1716, |
| 1637 | -1 |
| 1638 | }; |
| 1639 | int nid; |
| 1640 | u_int i; |
| 1641 | const EC_GROUP *g = EC_KEY_get0_group(k); |
| 1642 | |
| 1643 | /* |
| 1644 | * The group may be stored in a ASN.1 encoded private key in one of two |
| 1645 | * ways: as a "named group", which is reconstituted by ASN.1 object ID |
| 1646 | * or explicit group parameters encoded into the key blob. Only the |
| 1647 | * "named group" case sets the group NID for us, but we can figure |
| 1648 | * it out for the other case by comparing against all the groups that |
| 1649 | * are supported. |
| 1650 | */ |
| 1651 | if ((nid = EC_GROUP_get_curve_name(g)) > 0) |
| 1652 | return nid; |
| 1653 | for (i = 0; nids[i] != -1; i++) { |
| 1654 | if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL((void*)0)) |
| 1655 | return -1; |
| 1656 | if (EC_GROUP_cmp(g, eg, NULL((void*)0)) == 0) |
| 1657 | break; |
| 1658 | EC_GROUP_free(eg); |
| 1659 | } |
| 1660 | if (nids[i] != -1) { |
| 1661 | /* Use the group with the NID attached */ |
| 1662 | EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE0x001); |
| 1663 | if (EC_KEY_set_group(k, eg) != 1) { |
| 1664 | EC_GROUP_free(eg); |
| 1665 | return -1; |
| 1666 | } |
| 1667 | } |
| 1668 | return nids[i]; |
| 1669 | } |
| 1670 | |
| 1671 | static int |
| 1672 | ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap) |
| 1673 | { |
| 1674 | EC_KEY *private; |
| 1675 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 1676 | |
| 1677 | if (nid == NULL((void*)0) || ecdsap == NULL((void*)0)) |
| 1678 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1679 | if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) |
| 1680 | return SSH_ERR_KEY_LENGTH-56; |
| 1681 | *ecdsap = NULL((void*)0); |
| 1682 | if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL((void*)0)) { |
| 1683 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 1684 | goto out; |
| 1685 | } |
| 1686 | if (EC_KEY_generate_key(private) != 1) { |
| 1687 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1688 | goto out; |
| 1689 | } |
| 1690 | EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE0x001); |
| 1691 | *ecdsap = private; |
| 1692 | private = NULL((void*)0); |
| 1693 | ret = 0; |
| 1694 | out: |
| 1695 | EC_KEY_free(private); |
| 1696 | return ret; |
| 1697 | } |
| 1698 | #endif /* WITH_OPENSSL */ |
| 1699 | |
| 1700 | int |
| 1701 | sshkey_generate(int type, u_int bits, struct sshkey **keyp) |
| 1702 | { |
| 1703 | struct sshkey *k; |
| 1704 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 1705 | |
| 1706 | if (keyp == NULL((void*)0)) |
| 1707 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1708 | *keyp = NULL((void*)0); |
| 1709 | if ((k = sshkey_new(KEY_UNSPEC)) == NULL((void*)0)) |
| 1710 | return SSH_ERR_ALLOC_FAIL-2; |
| 1711 | switch (type) { |
| 1712 | case KEY_ED25519: |
| 1713 | if ((k->ed25519_pk = malloc(ED25519_PK_SZ32U)) == NULL((void*)0) || |
| 1714 | (k->ed25519_sk = malloc(ED25519_SK_SZ64U)) == NULL((void*)0)) { |
| 1715 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 1716 | break; |
| 1717 | } |
| 1718 | crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk); |
| 1719 | ret = 0; |
| 1720 | break; |
| 1721 | #ifdef WITH_XMSS |
| 1722 | case KEY_XMSS: |
| 1723 | ret = sshkey_xmss_generate_private_key(k, bits); |
| 1724 | break; |
| 1725 | #endif /* WITH_XMSS */ |
| 1726 | #ifdef WITH_OPENSSL1 |
| 1727 | case KEY_DSA: |
| 1728 | ret = dsa_generate_private_key(bits, &k->dsa); |
| 1729 | break; |
| 1730 | case KEY_ECDSA: |
| 1731 | ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid, |
| 1732 | &k->ecdsa); |
| 1733 | break; |
| 1734 | case KEY_RSA: |
| 1735 | ret = rsa_generate_private_key(bits, &k->rsa); |
| 1736 | break; |
| 1737 | #endif /* WITH_OPENSSL */ |
| 1738 | default: |
| 1739 | ret = SSH_ERR_INVALID_ARGUMENT-10; |
| 1740 | } |
| 1741 | if (ret == 0) { |
| 1742 | k->type = type; |
| 1743 | *keyp = k; |
| 1744 | } else |
| 1745 | sshkey_free(k); |
| 1746 | return ret; |
| 1747 | } |
| 1748 | |
| 1749 | int |
| 1750 | sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key) |
| 1751 | { |
| 1752 | u_int i; |
| 1753 | const struct sshkey_cert *from; |
| 1754 | struct sshkey_cert *to; |
| 1755 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1756 | |
| 1757 | if (to_key == NULL((void*)0) || (from = from_key->cert) == NULL((void*)0)) |
| 1758 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1759 | |
| 1760 | if ((to = cert_new()) == NULL((void*)0)) |
| 1761 | return SSH_ERR_ALLOC_FAIL-2; |
| 1762 | |
| 1763 | if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 || |
| 1764 | (r = sshbuf_putb(to->critical, from->critical)) != 0 || |
| 1765 | (r = sshbuf_putb(to->extensions, from->extensions)) != 0) |
| 1766 | goto out; |
| 1767 | |
| 1768 | to->serial = from->serial; |
| 1769 | to->type = from->type; |
| 1770 | if (from->key_id == NULL((void*)0)) |
| 1771 | to->key_id = NULL((void*)0); |
| 1772 | else if ((to->key_id = strdup(from->key_id)) == NULL((void*)0)) { |
| 1773 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1774 | goto out; |
| 1775 | } |
| 1776 | to->valid_after = from->valid_after; |
| 1777 | to->valid_before = from->valid_before; |
| 1778 | if (from->signature_key == NULL((void*)0)) |
| 1779 | to->signature_key = NULL((void*)0); |
| 1780 | else if ((r = sshkey_from_private(from->signature_key, |
| 1781 | &to->signature_key)) != 0) |
| 1782 | goto out; |
| 1783 | if (from->signature_type != NULL((void*)0) && |
| 1784 | (to->signature_type = strdup(from->signature_type)) == NULL((void*)0)) { |
| 1785 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1786 | goto out; |
| 1787 | } |
| 1788 | if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS256) { |
| 1789 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 1790 | goto out; |
| 1791 | } |
| 1792 | if (from->nprincipals > 0) { |
| 1793 | if ((to->principals = calloc(from->nprincipals, |
| 1794 | sizeof(*to->principals))) == NULL((void*)0)) { |
| 1795 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1796 | goto out; |
| 1797 | } |
| 1798 | for (i = 0; i < from->nprincipals; i++) { |
| 1799 | to->principals[i] = strdup(from->principals[i]); |
| 1800 | if (to->principals[i] == NULL((void*)0)) { |
| 1801 | to->nprincipals = i; |
| 1802 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1803 | goto out; |
| 1804 | } |
| 1805 | } |
| 1806 | } |
| 1807 | to->nprincipals = from->nprincipals; |
| 1808 | |
| 1809 | /* success */ |
| 1810 | cert_free(to_key->cert); |
| 1811 | to_key->cert = to; |
| 1812 | to = NULL((void*)0); |
| 1813 | r = 0; |
| 1814 | out: |
| 1815 | cert_free(to); |
| 1816 | return r; |
| 1817 | } |
| 1818 | |
| 1819 | int |
| 1820 | sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) |
| 1821 | { |
| 1822 | struct sshkey *n = NULL((void*)0); |
| 1823 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1824 | #ifdef WITH_OPENSSL1 |
| 1825 | const BIGNUM *rsa_n, *rsa_e; |
| 1826 | BIGNUM *rsa_n_dup = NULL((void*)0), *rsa_e_dup = NULL((void*)0); |
| 1827 | const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| 1828 | BIGNUM *dsa_p_dup = NULL((void*)0), *dsa_q_dup = NULL((void*)0), *dsa_g_dup = NULL((void*)0); |
| 1829 | BIGNUM *dsa_pub_key_dup = NULL((void*)0); |
| 1830 | #endif /* WITH_OPENSSL */ |
| 1831 | |
| 1832 | *pkp = NULL((void*)0); |
| 1833 | if ((n = sshkey_new(k->type)) == NULL((void*)0)) { |
| 1834 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1835 | goto out; |
| 1836 | } |
| 1837 | switch (k->type) { |
| 1838 | #ifdef WITH_OPENSSL1 |
| 1839 | case KEY_DSA: |
| 1840 | case KEY_DSA_CERT: |
| 1841 | DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); |
| 1842 | DSA_get0_key(k->dsa, &dsa_pub_key, NULL((void*)0)); |
| 1843 | if ((dsa_p_dup = BN_dup(dsa_p)) == NULL((void*)0) || |
| 1844 | (dsa_q_dup = BN_dup(dsa_q)) == NULL((void*)0) || |
| 1845 | (dsa_g_dup = BN_dup(dsa_g)) == NULL((void*)0) || |
| 1846 | (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL((void*)0)) { |
| 1847 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1848 | goto out; |
| 1849 | } |
| 1850 | if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) { |
| 1851 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1852 | goto out; |
| 1853 | } |
| 1854 | dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL((void*)0); /* transferred */ |
| 1855 | if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL((void*)0))) { |
| 1856 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1857 | goto out; |
| 1858 | } |
| 1859 | dsa_pub_key_dup = NULL((void*)0); /* transferred */ |
| 1860 | |
| 1861 | break; |
| 1862 | case KEY_ECDSA: |
| 1863 | case KEY_ECDSA_CERT: |
| 1864 | case KEY_ECDSA_SK: |
| 1865 | case KEY_ECDSA_SK_CERT: |
| 1866 | n->ecdsa_nid = k->ecdsa_nid; |
| 1867 | n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| 1868 | if (n->ecdsa == NULL((void*)0)) { |
| 1869 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1870 | goto out; |
| 1871 | } |
| 1872 | if (EC_KEY_set_public_key(n->ecdsa, |
| 1873 | EC_KEY_get0_public_key(k->ecdsa)) != 1) { |
| 1874 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1875 | goto out; |
| 1876 | } |
| 1877 | if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT) |
| 1878 | break; |
| 1879 | /* Append security-key application string */ |
| 1880 | if ((n->sk_application = strdup(k->sk_application)) == NULL((void*)0)) |
| 1881 | goto out; |
| 1882 | break; |
| 1883 | case KEY_RSA: |
| 1884 | case KEY_RSA_CERT: |
| 1885 | RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL((void*)0)); |
| 1886 | if ((rsa_n_dup = BN_dup(rsa_n)) == NULL((void*)0) || |
| 1887 | (rsa_e_dup = BN_dup(rsa_e)) == NULL((void*)0)) { |
| 1888 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1889 | goto out; |
| 1890 | } |
| 1891 | if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL((void*)0))) { |
| 1892 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 1893 | goto out; |
| 1894 | } |
| 1895 | rsa_n_dup = rsa_e_dup = NULL((void*)0); /* transferred */ |
| 1896 | break; |
| 1897 | #endif /* WITH_OPENSSL */ |
| 1898 | case KEY_ED25519: |
| 1899 | case KEY_ED25519_CERT: |
| 1900 | case KEY_ED25519_SK: |
| 1901 | case KEY_ED25519_SK_CERT: |
| 1902 | if (k->ed25519_pk != NULL((void*)0)) { |
| 1903 | if ((n->ed25519_pk = malloc(ED25519_PK_SZ32U)) == NULL((void*)0)) { |
| 1904 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1905 | goto out; |
| 1906 | } |
| 1907 | memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ32U); |
| 1908 | } |
| 1909 | if (k->type != KEY_ED25519_SK && |
| 1910 | k->type != KEY_ED25519_SK_CERT) |
| 1911 | break; |
| 1912 | /* Append security-key application string */ |
| 1913 | if ((n->sk_application = strdup(k->sk_application)) == NULL((void*)0)) |
| 1914 | goto out; |
| 1915 | break; |
| 1916 | #ifdef WITH_XMSS |
| 1917 | case KEY_XMSS: |
| 1918 | case KEY_XMSS_CERT: |
| 1919 | if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0) |
| 1920 | goto out; |
| 1921 | if (k->xmss_pk != NULL((void*)0)) { |
| 1922 | u_int32_t left; |
| 1923 | size_t pklen = sshkey_xmss_pklen(k); |
| 1924 | if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) { |
| 1925 | r = SSH_ERR_INTERNAL_ERROR-1; |
| 1926 | goto out; |
| 1927 | } |
| 1928 | if ((n->xmss_pk = malloc(pklen)) == NULL((void*)0)) { |
| 1929 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1930 | goto out; |
| 1931 | } |
| 1932 | memcpy(n->xmss_pk, k->xmss_pk, pklen); |
| 1933 | /* simulate number of signatures left on pubkey */ |
| 1934 | left = sshkey_xmss_signatures_left(k); |
| 1935 | if (left) |
| 1936 | sshkey_xmss_enable_maxsign(n, left); |
| 1937 | } |
| 1938 | break; |
| 1939 | #endif /* WITH_XMSS */ |
| 1940 | default: |
| 1941 | r = SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 1942 | goto out; |
| 1943 | } |
| 1944 | if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0) |
| 1945 | goto out; |
| 1946 | /* success */ |
| 1947 | *pkp = n; |
| 1948 | n = NULL((void*)0); |
| 1949 | r = 0; |
| 1950 | out: |
| 1951 | sshkey_free(n); |
| 1952 | #ifdef WITH_OPENSSL1 |
| 1953 | BN_clear_free(rsa_n_dup); |
| 1954 | BN_clear_free(rsa_e_dup); |
| 1955 | BN_clear_free(dsa_p_dup); |
| 1956 | BN_clear_free(dsa_q_dup); |
| 1957 | BN_clear_free(dsa_g_dup); |
| 1958 | BN_clear_free(dsa_pub_key_dup); |
| 1959 | #endif /* WITH_OPENSSL */ |
| 1960 | |
| 1961 | return r; |
| 1962 | } |
| 1963 | |
| 1964 | int |
| 1965 | sshkey_is_shielded(struct sshkey *k) |
| 1966 | { |
| 1967 | return k != NULL((void*)0) && k->shielded_private != NULL((void*)0); |
| 1968 | } |
| 1969 | |
| 1970 | int |
| 1971 | sshkey_shield_private(struct sshkey *k) |
| 1972 | { |
| 1973 | struct sshbuf *prvbuf = NULL((void*)0); |
| 1974 | u_char *prekey = NULL((void*)0), *enc = NULL((void*)0), keyiv[SSH_DIGEST_MAX_LENGTH64]; |
| 1975 | struct sshcipher_ctx *cctx = NULL((void*)0); |
| 1976 | const struct sshcipher *cipher; |
| 1977 | size_t i, enclen = 0; |
| 1978 | struct sshkey *kswap = NULL((void*)0), tmp; |
| 1979 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1980 | |
| 1981 | #ifdef DEBUG_PK |
| 1982 | fprintf(stderr(&__sF[2]), "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); |
| 1983 | #endif |
| 1984 | if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER"aes256-ctr")) == NULL((void*)0)) { |
| 1985 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 1986 | goto out; |
| 1987 | } |
| 1988 | if (cipher_keylen(cipher) + cipher_ivlen(cipher) > |
| 1989 | ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4)) { |
| 1990 | r = SSH_ERR_INTERNAL_ERROR-1; |
| 1991 | goto out; |
| 1992 | } |
| 1993 | |
| 1994 | /* Prepare a random pre-key, and from it an ephemeral key */ |
| 1995 | if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN(16 * 1024))) == NULL((void*)0)) { |
| 1996 | r = SSH_ERR_ALLOC_FAIL-2; |
| 1997 | goto out; |
| 1998 | } |
| 1999 | arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024)); |
| 2000 | if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH4, |
| 2001 | prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024), |
| 2002 | keyiv, SSH_DIGEST_MAX_LENGTH64)) != 0) |
| 2003 | goto out; |
| 2004 | #ifdef DEBUG_PK |
| 2005 | fprintf(stderr(&__sF[2]), "%s: key+iv\n", __func__); |
| 2006 | sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4), |
| 2007 | stderr(&__sF[2])); |
| 2008 | #endif |
| 2009 | if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), |
| 2010 | keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0) |
| 2011 | goto out; |
| 2012 | |
| 2013 | /* Serialise and encrypt the private key using the ephemeral key */ |
| 2014 | if ((prvbuf = sshbuf_new()) == NULL((void*)0)) { |
| 2015 | r = SSH_ERR_ALLOC_FAIL-2; |
| 2016 | goto out; |
| 2017 | } |
| 2018 | if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0) |
| 2019 | goto out; |
| 2020 | if ((r = sshkey_private_serialize_opt(k, prvbuf, |
| 2021 | SSHKEY_SERIALIZE_SHIELD)) != 0) |
| 2022 | goto out; |
| 2023 | /* pad to cipher blocksize */ |
| 2024 | i = 0; |
| 2025 | while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) { |
| 2026 | if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0) |
| 2027 | goto out; |
| 2028 | } |
| 2029 | #ifdef DEBUG_PK |
| 2030 | fprintf(stderr(&__sF[2]), "%s: serialised\n", __func__); |
| 2031 | sshbuf_dump(prvbuf, stderr(&__sF[2])); |
| 2032 | #endif |
| 2033 | /* encrypt */ |
| 2034 | enclen = sshbuf_len(prvbuf); |
| 2035 | if ((enc = malloc(enclen)) == NULL((void*)0)) { |
| 2036 | r = SSH_ERR_ALLOC_FAIL-2; |
| 2037 | goto out; |
| 2038 | } |
| 2039 | if ((r = cipher_crypt(cctx, 0, enc, |
| 2040 | sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0) |
| 2041 | goto out; |
| 2042 | #ifdef DEBUG_PK |
| 2043 | fprintf(stderr(&__sF[2]), "%s: encrypted\n", __func__); |
| 2044 | sshbuf_dump_data(enc, enclen, stderr(&__sF[2])); |
| 2045 | #endif |
| 2046 | |
| 2047 | /* Make a scrubbed, public-only copy of our private key argument */ |
| 2048 | if ((r = sshkey_from_private(k, &kswap)) != 0) |
| 2049 | goto out; |
| 2050 | |
| 2051 | /* Swap the private key out (it will be destroyed below) */ |
| 2052 | tmp = *kswap; |
| 2053 | *kswap = *k; |
| 2054 | *k = tmp; |
| 2055 | |
| 2056 | /* Insert the shielded key into our argument */ |
| 2057 | k->shielded_private = enc; |
| 2058 | k->shielded_len = enclen; |
| 2059 | k->shield_prekey = prekey; |
| 2060 | k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN(16 * 1024); |
| 2061 | enc = prekey = NULL((void*)0); /* transferred */ |
| 2062 | enclen = 0; |
| 2063 | |
| 2064 | /* preserve key fields that are required for correct operation */ |
| 2065 | k->sk_flags = kswap->sk_flags; |
| 2066 | |
| 2067 | /* success */ |
| 2068 | r = 0; |
| 2069 | |
| 2070 | out: |
| 2071 | /* XXX behaviour on error - invalidate original private key? */ |
| 2072 | cipher_free(cctx); |
| 2073 | explicit_bzero(keyiv, sizeof(keyiv)); |
| 2074 | explicit_bzero(&tmp, sizeof(tmp)); |
| 2075 | freezero(enc, enclen); |
| 2076 | freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024)); |
| 2077 | sshkey_free(kswap); |
| 2078 | sshbuf_free(prvbuf); |
| 2079 | return r; |
| 2080 | } |
| 2081 | |
| 2082 | int |
| 2083 | sshkey_unshield_private(struct sshkey *k) |
| 2084 | { |
| 2085 | struct sshbuf *prvbuf = NULL((void*)0); |
| 2086 | u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH64]; |
| 2087 | struct sshcipher_ctx *cctx = NULL((void*)0); |
| 2088 | const struct sshcipher *cipher; |
| 2089 | size_t i; |
| 2090 | struct sshkey *kswap = NULL((void*)0), tmp; |
| 2091 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 2092 | |
| 2093 | #ifdef DEBUG_PK |
| 2094 | fprintf(stderr(&__sF[2]), "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); |
| 2095 | #endif |
| 2096 | if (!sshkey_is_shielded(k)) |
| 2097 | return 0; /* nothing to do */ |
| 2098 | |
| 2099 | if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER"aes256-ctr")) == NULL((void*)0)) { |
| 2100 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 2101 | goto out; |
| 2102 | } |
| 2103 | if (cipher_keylen(cipher) + cipher_ivlen(cipher) > |
| 2104 | ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4)) { |
| 2105 | r = SSH_ERR_INTERNAL_ERROR-1; |
| 2106 | goto out; |
| 2107 | } |
| 2108 | /* check size of shielded key blob */ |
| 2109 | if (k->shielded_len < cipher_blocksize(cipher) || |
| 2110 | (k->shielded_len % cipher_blocksize(cipher)) != 0) { |
| 2111 | r = SSH_ERR_INVALID_FORMAT-4; |
| 2112 | goto out; |
| 2113 | } |
| 2114 | |
| 2115 | /* Calculate the ephemeral key from the prekey */ |
| 2116 | if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH4, |
| 2117 | k->shield_prekey, k->shield_prekey_len, |
| 2118 | keyiv, SSH_DIGEST_MAX_LENGTH64)) != 0) |
| 2119 | goto out; |
| 2120 | if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), |
| 2121 | keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0) |
| 2122 | goto out; |
| 2123 | #ifdef DEBUG_PK |
| 2124 | fprintf(stderr(&__sF[2]), "%s: key+iv\n", __func__); |
| 2125 | sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4), |
| 2126 | stderr(&__sF[2])); |
| 2127 | #endif |
| 2128 | |
| 2129 | /* Decrypt and parse the shielded private key using the ephemeral key */ |
| 2130 | if ((prvbuf = sshbuf_new()) == NULL((void*)0)) { |
| 2131 | r = SSH_ERR_ALLOC_FAIL-2; |
| 2132 | goto out; |
| 2133 | } |
| 2134 | if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0) |
| 2135 | goto out; |
| 2136 | /* decrypt */ |
| 2137 | #ifdef DEBUG_PK |
| 2138 | fprintf(stderr(&__sF[2]), "%s: encrypted\n", __func__); |
| 2139 | sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr(&__sF[2])); |
| 2140 | #endif |
| 2141 | if ((r = cipher_crypt(cctx, 0, cp, |
| 2142 | k->shielded_private, k->shielded_len, 0, 0)) != 0) |
| 2143 | goto out; |
| 2144 | #ifdef DEBUG_PK |
| 2145 | fprintf(stderr(&__sF[2]), "%s: serialised\n", __func__); |
| 2146 | sshbuf_dump(prvbuf, stderr(&__sF[2])); |
| 2147 | #endif |
| 2148 | /* Parse private key */ |
| 2149 | if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0) |
| 2150 | goto out; |
| 2151 | /* Check deterministic padding */ |
| 2152 | i = 0; |
| 2153 | while (sshbuf_len(prvbuf)) { |
| 2154 | if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0) |
| 2155 | goto out; |
| 2156 | if (pad != (++i & 0xff)) { |
| 2157 | r = SSH_ERR_INVALID_FORMAT-4; |
| 2158 | goto out; |
| 2159 | } |
| 2160 | } |
| 2161 | |
| 2162 | /* Swap the parsed key back into place */ |
| 2163 | tmp = *kswap; |
| 2164 | *kswap = *k; |
| 2165 | *k = tmp; |
| 2166 | |
| 2167 | /* success */ |
| 2168 | r = 0; |
| 2169 | |
| 2170 | out: |
| 2171 | cipher_free(cctx); |
| 2172 | explicit_bzero(keyiv, sizeof(keyiv)); |
| 2173 | explicit_bzero(&tmp, sizeof(tmp)); |
| 2174 | sshkey_free(kswap); |
| 2175 | sshbuf_free(prvbuf); |
| 2176 | return r; |
| 2177 | } |
| 2178 | |
| 2179 | static int |
| 2180 | cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) |
| 2181 | { |
| 2182 | struct sshbuf *principals = NULL((void*)0), *crit = NULL((void*)0); |
| 2183 | struct sshbuf *exts = NULL((void*)0), *ca = NULL((void*)0); |
| 2184 | u_char *sig = NULL((void*)0); |
| 2185 | size_t signed_len = 0, slen = 0, kidlen = 0; |
| 2186 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 2187 | |
| 2188 | /* Copy the entire key blob for verification and later serialisation */ |
| 2189 | if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) |
| 2190 | return ret; |
| 2191 | |
| 2192 | /* Parse body of certificate up to signature */ |
| 2193 | if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || |
| 2194 | (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || |
Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret' | |
| 2195 | (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || |
| 2196 | (ret = sshbuf_froms(b, &principals)) != 0 || |
| 2197 | (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || |
| 2198 | (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || |
| 2199 | (ret = sshbuf_froms(b, &crit)) != 0 || |
| 2200 | (ret = sshbuf_froms(b, &exts)) != 0 || |
| 2201 | (ret = sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0))) != 0 || |
| 2202 | (ret = sshbuf_froms(b, &ca)) != 0) { |
| 2203 | /* XXX debug print error for ret */ |
| 2204 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2205 | goto out; |
| 2206 | } |
| 2207 | |
| 2208 | /* Signature is left in the buffer so we can calculate this length */ |
| 2209 | signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); |
| 2210 | |
| 2211 | if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { |
| 2212 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2213 | goto out; |
| 2214 | } |
| 2215 | |
| 2216 | if (key->cert->type != SSH2_CERT_TYPE_USER1 && |
| 2217 | key->cert->type != SSH2_CERT_TYPE_HOST2) { |
| 2218 | ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE-18; |
| 2219 | goto out; |
| 2220 | } |
| 2221 | |
| 2222 | /* Parse principals section */ |
| 2223 | while (sshbuf_len(principals) > 0) { |
| 2224 | char *principal = NULL((void*)0); |
| 2225 | char **oprincipals = NULL((void*)0); |
| 2226 | |
| 2227 | if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS256) { |
| 2228 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2229 | goto out; |
| 2230 | } |
| 2231 | if ((ret = sshbuf_get_cstring(principals, &principal, |
| 2232 | NULL((void*)0))) != 0) { |
| 2233 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2234 | goto out; |
| 2235 | } |
| 2236 | oprincipals = key->cert->principals; |
| 2237 | key->cert->principals = recallocarray(key->cert->principals, |
| 2238 | key->cert->nprincipals, key->cert->nprincipals + 1, |
| 2239 | sizeof(*key->cert->principals)); |
| 2240 | if (key->cert->principals == NULL((void*)0)) { |
| 2241 | free(principal); |
| 2242 | key->cert->principals = oprincipals; |
| 2243 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2244 | goto out; |
| 2245 | } |
| 2246 | key->cert->principals[key->cert->nprincipals++] = principal; |
| 2247 | } |
| 2248 | |
| 2249 | /* |
| 2250 | * Stash a copies of the critical options and extensions sections |
| 2251 | * for later use. |
| 2252 | */ |
| 2253 | if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || |
| 2254 | (exts != NULL((void*)0) && |
| 2255 | (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) |
| 2256 | goto out; |
| 2257 | |
| 2258 | /* |
| 2259 | * Validate critical options and extensions sections format. |
| 2260 | */ |
| 2261 | while (sshbuf_len(crit) != 0) { |
| 2262 | if ((ret = sshbuf_get_string_direct(crit, NULL((void*)0), NULL((void*)0))) != 0 || |
| 2263 | (ret = sshbuf_get_string_direct(crit, NULL((void*)0), NULL((void*)0))) != 0) { |
| 2264 | sshbuf_reset(key->cert->critical); |
| 2265 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2266 | goto out; |
| 2267 | } |
| 2268 | } |
| 2269 | while (exts != NULL((void*)0) && sshbuf_len(exts) != 0) { |
| 2270 | if ((ret = sshbuf_get_string_direct(exts, NULL((void*)0), NULL((void*)0))) != 0 || |
| 2271 | (ret = sshbuf_get_string_direct(exts, NULL((void*)0), NULL((void*)0))) != 0) { |
| 2272 | sshbuf_reset(key->cert->extensions); |
| 2273 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2274 | goto out; |
| 2275 | } |
| 2276 | } |
| 2277 | |
| 2278 | /* Parse CA key and check signature */ |
| 2279 | if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { |
| 2280 | ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19; |
| 2281 | goto out; |
| 2282 | } |
| 2283 | if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { |
| 2284 | ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19; |
| 2285 | goto out; |
| 2286 | } |
| 2287 | if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, |
| 2288 | sshbuf_ptr(key->cert->certblob), signed_len, NULL((void*)0), 0, NULL((void*)0))) != 0) |
| 2289 | goto out; |
| 2290 | if ((ret = sshkey_get_sigtype(sig, slen, |
| 2291 | &key->cert->signature_type)) != 0) |
| 2292 | goto out; |
| 2293 | |
| 2294 | /* Success */ |
| 2295 | ret = 0; |
| 2296 | out: |
| 2297 | sshbuf_free(ca); |
| 2298 | sshbuf_free(crit); |
| 2299 | sshbuf_free(exts); |
| 2300 | sshbuf_free(principals); |
| 2301 | free(sig); |
| 2302 | return ret; |
| 2303 | } |
| 2304 | |
| 2305 | #ifdef WITH_OPENSSL1 |
| 2306 | static int |
| 2307 | check_rsa_length(const RSA *rsa) |
| 2308 | { |
| 2309 | const BIGNUM *rsa_n; |
| 2310 | |
| 2311 | RSA_get0_key(rsa, &rsa_n, NULL((void*)0), NULL((void*)0)); |
| 2312 | if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE1024) |
| 2313 | return SSH_ERR_KEY_LENGTH-56; |
| 2314 | return 0; |
| 2315 | } |
| 2316 | #endif /* WITH_OPENSSL */ |
| 2317 | |
| 2318 | static int |
| 2319 | sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, |
| 2320 | int allow_cert) |
| 2321 | { |
| 2322 | int type, ret = SSH_ERR_INTERNAL_ERROR-1; |
| 2323 | char *ktype = NULL((void*)0), *curve = NULL((void*)0), *xmss_name = NULL((void*)0); |
| 2324 | struct sshkey *key = NULL((void*)0); |
| 2325 | size_t len; |
| 2326 | u_char *pk = NULL((void*)0); |
| 2327 | struct sshbuf *copy; |
| 2328 | #ifdef WITH_OPENSSL1 |
| 2329 | EC_POINT *q = NULL((void*)0); |
| 2330 | BIGNUM *rsa_n = NULL((void*)0), *rsa_e = NULL((void*)0); |
| 2331 | BIGNUM *dsa_p = NULL((void*)0), *dsa_q = NULL((void*)0), *dsa_g = NULL((void*)0), *dsa_pub_key = NULL((void*)0); |
| 2332 | #endif /* WITH_OPENSSL */ |
| 2333 | |
| 2334 | #ifdef DEBUG_PK /* XXX */ |
| 2335 | sshbuf_dump(b, stderr(&__sF[2])); |
| 2336 | #endif |
| 2337 | if (keyp != NULL((void*)0)) |
| 2338 | *keyp = NULL((void*)0); |
| 2339 | if ((copy = sshbuf_fromb(b)) == NULL((void*)0)) { |
| 2340 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2341 | goto out; |
| 2342 | } |
| 2343 | if (sshbuf_get_cstring(b, &ktype, NULL((void*)0)) != 0) { |
| 2344 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2345 | goto out; |
| 2346 | } |
| 2347 | |
| 2348 | type = sshkey_type_from_name(ktype); |
| 2349 | if (!allow_cert && sshkey_type_is_cert(type)) { |
| 2350 | ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19; |
| 2351 | goto out; |
| 2352 | } |
| 2353 | switch (type) { |
| 2354 | #ifdef WITH_OPENSSL1 |
| 2355 | case KEY_RSA_CERT: |
| 2356 | /* Skip nonce */ |
| 2357 | if (sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0)) != 0) { |
| 2358 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2359 | goto out; |
| 2360 | } |
| 2361 | /* FALLTHROUGH */ |
| 2362 | case KEY_RSA: |
| 2363 | if ((key = sshkey_new(type)) == NULL((void*)0)) { |
| 2364 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2365 | goto out; |
| 2366 | } |
| 2367 | if (sshbuf_get_bignum2(b, &rsa_e) != 0 || |
| 2368 | sshbuf_get_bignum2(b, &rsa_n) != 0) { |
| 2369 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2370 | goto out; |
| 2371 | } |
| 2372 | if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL((void*)0))) { |
| 2373 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 2374 | goto out; |
| 2375 | } |
| 2376 | rsa_n = rsa_e = NULL((void*)0); /* transferred */ |
| 2377 | if ((ret = check_rsa_length(key->rsa)) != 0) |
| 2378 | goto out; |
| 2379 | #ifdef DEBUG_PK |
| 2380 | RSA_print_fp(stderr(&__sF[2]), key->rsa, 8); |
| 2381 | #endif |
| 2382 | break; |
| 2383 | case KEY_DSA_CERT: |
| 2384 | /* Skip nonce */ |
| 2385 | if (sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0)) != 0) { |
| 2386 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2387 | goto out; |
| 2388 | } |
| 2389 | /* FALLTHROUGH */ |
| 2390 | case KEY_DSA: |
| 2391 | if ((key = sshkey_new(type)) == NULL((void*)0)) { |
| 2392 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2393 | goto out; |
| 2394 | } |
| 2395 | if (sshbuf_get_bignum2(b, &dsa_p) != 0 || |
| 2396 | sshbuf_get_bignum2(b, &dsa_q) != 0 || |
| 2397 | sshbuf_get_bignum2(b, &dsa_g) != 0 || |
| 2398 | sshbuf_get_bignum2(b, &dsa_pub_key) != 0) { |
| 2399 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2400 | goto out; |
| 2401 | } |
| 2402 | if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) { |
| 2403 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 2404 | goto out; |
| 2405 | } |
| 2406 | dsa_p = dsa_q = dsa_g = NULL((void*)0); /* transferred */ |
| 2407 | if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL((void*)0))) { |
| 2408 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 2409 | goto out; |
| 2410 | } |
| 2411 | dsa_pub_key = NULL((void*)0); /* transferred */ |
| 2412 | #ifdef DEBUG_PK |
| 2413 | DSA_print_fp(stderr(&__sF[2]), key->dsa, 8); |
| 2414 | #endif |
| 2415 | break; |
| 2416 | case KEY_ECDSA_CERT: |
| 2417 | case KEY_ECDSA_SK_CERT: |
| 2418 | /* Skip nonce */ |
| 2419 | if (sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0)) != 0) { |
| 2420 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2421 | goto out; |
| 2422 | } |
| 2423 | /* FALLTHROUGH */ |
| 2424 | case KEY_ECDSA: |
| 2425 | case KEY_ECDSA_SK: |
| 2426 | if ((key = sshkey_new(type)) == NULL((void*)0)) { |
| 2427 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2428 | goto out; |
| 2429 | } |
| 2430 | key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); |
| 2431 | if (sshbuf_get_cstring(b, &curve, NULL((void*)0)) != 0) { |
| 2432 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2433 | goto out; |
| 2434 | } |
| 2435 | if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| 2436 | ret = SSH_ERR_EC_CURVE_MISMATCH-15; |
| 2437 | goto out; |
| 2438 | } |
| 2439 | EC_KEY_free(key->ecdsa); |
| 2440 | if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) |
| 2441 | == NULL((void*)0)) { |
| 2442 | ret = SSH_ERR_EC_CURVE_INVALID-12; |
| 2443 | goto out; |
| 2444 | } |
| 2445 | if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL((void*)0)) { |
| 2446 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2447 | goto out; |
| 2448 | } |
| 2449 | if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) { |
| 2450 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2451 | goto out; |
| 2452 | } |
| 2453 | if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), |
| 2454 | q) != 0) { |
| 2455 | ret = SSH_ERR_KEY_INVALID_EC_VALUE-20; |
| 2456 | goto out; |
| 2457 | } |
| 2458 | if (EC_KEY_set_public_key(key->ecdsa, q) != 1) { |
| 2459 | /* XXX assume it is a allocation error */ |
| 2460 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2461 | goto out; |
| 2462 | } |
| 2463 | #ifdef DEBUG_PK |
| 2464 | sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); |
| 2465 | #endif |
| 2466 | if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) { |
| 2467 | /* Parse additional security-key application string */ |
| 2468 | if (sshbuf_get_cstring(b, &key->sk_application, |
| 2469 | NULL((void*)0)) != 0) { |
| 2470 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2471 | goto out; |
| 2472 | } |
| 2473 | #ifdef DEBUG_PK |
| 2474 | fprintf(stderr(&__sF[2]), "App: %s\n", key->sk_application); |
| 2475 | #endif |
| 2476 | } |
| 2477 | break; |
| 2478 | #endif /* WITH_OPENSSL */ |
| 2479 | case KEY_ED25519_CERT: |
| 2480 | case KEY_ED25519_SK_CERT: |
| 2481 | /* Skip nonce */ |
| 2482 | if (sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0)) != 0) { |
| 2483 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2484 | goto out; |
| 2485 | } |
| 2486 | /* FALLTHROUGH */ |
| 2487 | case KEY_ED25519: |
| 2488 | case KEY_ED25519_SK: |
| 2489 | if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) |
| 2490 | goto out; |
| 2491 | if (len != ED25519_PK_SZ32U) { |
| 2492 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2493 | goto out; |
| 2494 | } |
| 2495 | if ((key = sshkey_new(type)) == NULL((void*)0)) { |
| 2496 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2497 | goto out; |
| 2498 | } |
| 2499 | if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) { |
| 2500 | /* Parse additional security-key application string */ |
| 2501 | if (sshbuf_get_cstring(b, &key->sk_application, |
| 2502 | NULL((void*)0)) != 0) { |
| 2503 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2504 | goto out; |
| 2505 | } |
| 2506 | #ifdef DEBUG_PK |
| 2507 | fprintf(stderr(&__sF[2]), "App: %s\n", key->sk_application); |
| 2508 | #endif |
| 2509 | } |
| 2510 | key->ed25519_pk = pk; |
| 2511 | pk = NULL((void*)0); |
| 2512 | break; |
| 2513 | #ifdef WITH_XMSS |
| 2514 | case KEY_XMSS_CERT: |
| 2515 | /* Skip nonce */ |
| 2516 | if (sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0)) != 0) { |
| 2517 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2518 | goto out; |
| 2519 | } |
| 2520 | /* FALLTHROUGH */ |
| 2521 | case KEY_XMSS: |
| 2522 | if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL((void*)0))) != 0) |
| 2523 | goto out; |
| 2524 | if ((key = sshkey_new(type)) == NULL((void*)0)) { |
| 2525 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2526 | goto out; |
| 2527 | } |
| 2528 | if ((ret = sshkey_xmss_init(key, xmss_name)) != 0) |
| 2529 | goto out; |
| 2530 | if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) |
| 2531 | goto out; |
| 2532 | if (len == 0 || len != sshkey_xmss_pklen(key)) { |
| 2533 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2534 | goto out; |
| 2535 | } |
| 2536 | key->xmss_pk = pk; |
| 2537 | pk = NULL((void*)0); |
| 2538 | if (type != KEY_XMSS_CERT && |
| 2539 | (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0) |
| 2540 | goto out; |
| 2541 | break; |
| 2542 | #endif /* WITH_XMSS */ |
| 2543 | case KEY_UNSPEC: |
| 2544 | default: |
| 2545 | ret = SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 2546 | goto out; |
| 2547 | } |
| 2548 | |
| 2549 | /* Parse certificate potion */ |
| 2550 | if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) |
| 2551 | goto out; |
| 2552 | |
| 2553 | if (key != NULL((void*)0) && sshbuf_len(b) != 0) { |
| 2554 | ret = SSH_ERR_INVALID_FORMAT-4; |
| 2555 | goto out; |
| 2556 | } |
| 2557 | ret = 0; |
| 2558 | if (keyp != NULL((void*)0)) { |
| 2559 | *keyp = key; |
| 2560 | key = NULL((void*)0); |
| 2561 | } |
| 2562 | out: |
| 2563 | sshbuf_free(copy); |
| 2564 | sshkey_free(key); |
| 2565 | free(xmss_name); |
| 2566 | free(ktype); |
| 2567 | free(curve); |
| 2568 | free(pk); |
| 2569 | #ifdef WITH_OPENSSL1 |
| 2570 | EC_POINT_free(q); |
| 2571 | BN_clear_free(rsa_n); |
| 2572 | BN_clear_free(rsa_e); |
| 2573 | BN_clear_free(dsa_p); |
| 2574 | BN_clear_free(dsa_q); |
| 2575 | BN_clear_free(dsa_g); |
| 2576 | BN_clear_free(dsa_pub_key); |
| 2577 | #endif /* WITH_OPENSSL */ |
| 2578 | return ret; |
| 2579 | } |
| 2580 | |
| 2581 | int |
| 2582 | sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) |
| 2583 | { |
| 2584 | struct sshbuf *b; |
| 2585 | int r; |
| 2586 | |
| 2587 | if ((b = sshbuf_from(blob, blen)) == NULL((void*)0)) |
| 2588 | return SSH_ERR_ALLOC_FAIL-2; |
| 2589 | r = sshkey_from_blob_internal(b, keyp, 1); |
| 2590 | sshbuf_free(b); |
| 2591 | return r; |
| 2592 | } |
| 2593 | |
| 2594 | int |
| 2595 | sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) |
| 2596 | { |
| 2597 | return sshkey_from_blob_internal(b, keyp, 1); |
| 2598 | } |
| 2599 | |
| 2600 | int |
| 2601 | sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) |
| 2602 | { |
| 2603 | struct sshbuf *b; |
| 2604 | int r; |
| 2605 | |
| 2606 | if ((r = sshbuf_froms(buf, &b)) != 0) |
| 2607 | return r; |
| 2608 | r = sshkey_from_blob_internal(b, keyp, 1); |
| 2609 | sshbuf_free(b); |
| 2610 | return r; |
| 2611 | } |
| 2612 | |
| 2613 | int |
| 2614 | sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep) |
| 2615 | { |
| 2616 | int r; |
| 2617 | struct sshbuf *b = NULL((void*)0); |
| 2618 | char *sigtype = NULL((void*)0); |
| 2619 | |
| 2620 | if (sigtypep != NULL((void*)0)) |
| 2621 | *sigtypep = NULL((void*)0); |
| 2622 | if ((b = sshbuf_from(sig, siglen)) == NULL((void*)0)) |
| 2623 | return SSH_ERR_ALLOC_FAIL-2; |
| 2624 | if ((r = sshbuf_get_cstring(b, &sigtype, NULL((void*)0))) != 0) |
| 2625 | goto out; |
| 2626 | /* success */ |
| 2627 | if (sigtypep != NULL((void*)0)) { |
| 2628 | *sigtypep = sigtype; |
| 2629 | sigtype = NULL((void*)0); |
| 2630 | } |
| 2631 | r = 0; |
| 2632 | out: |
| 2633 | free(sigtype); |
| 2634 | sshbuf_free(b); |
| 2635 | return r; |
| 2636 | } |
| 2637 | |
| 2638 | /* |
| 2639 | * |
| 2640 | * Checks whether a certificate's signature type is allowed. |
| 2641 | * Returns 0 (success) if the certificate signature type appears in the |
| 2642 | * "allowed" pattern-list, or the key is not a certificate to begin with. |
| 2643 | * Otherwise returns a ssherr.h code. |
| 2644 | */ |
| 2645 | int |
| 2646 | sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed) |
| 2647 | { |
| 2648 | if (key == NULL((void*)0) || allowed == NULL((void*)0)) |
| 2649 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2650 | if (!sshkey_type_is_cert(key->type)) |
| 2651 | return 0; |
| 2652 | if (key->cert == NULL((void*)0) || key->cert->signature_type == NULL((void*)0)) |
| 2653 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2654 | if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1) |
| 2655 | return SSH_ERR_SIGN_ALG_UNSUPPORTED-58; |
| 2656 | return 0; |
| 2657 | } |
| 2658 | |
| 2659 | /* |
| 2660 | * Returns the expected signature algorithm for a given public key algorithm. |
| 2661 | */ |
| 2662 | const char * |
| 2663 | sshkey_sigalg_by_name(const char *name) |
| 2664 | { |
| 2665 | const struct keytype *kt; |
| 2666 | |
| 2667 | for (kt = keytypes; kt->type != -1; kt++) { |
| 2668 | if (strcmp(kt->name, name) != 0) |
| 2669 | continue; |
| 2670 | if (kt->sigalg != NULL((void*)0)) |
| 2671 | return kt->sigalg; |
| 2672 | if (!kt->cert) |
| 2673 | return kt->name; |
| 2674 | return sshkey_ssh_name_from_type_nid( |
| 2675 | sshkey_type_plain(kt->type), kt->nid); |
| 2676 | } |
| 2677 | return NULL((void*)0); |
| 2678 | } |
| 2679 | |
| 2680 | /* |
| 2681 | * Verifies that the signature algorithm appearing inside the signature blob |
| 2682 | * matches that which was requested. |
| 2683 | */ |
| 2684 | int |
| 2685 | sshkey_check_sigtype(const u_char *sig, size_t siglen, |
| 2686 | const char *requested_alg) |
| 2687 | { |
| 2688 | const char *expected_alg; |
| 2689 | char *sigtype = NULL((void*)0); |
| 2690 | int r; |
| 2691 | |
| 2692 | if (requested_alg == NULL((void*)0)) |
| 2693 | return 0; |
| 2694 | if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL((void*)0)) |
| 2695 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2696 | if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0) |
| 2697 | return r; |
| 2698 | r = strcmp(expected_alg, sigtype) == 0; |
| 2699 | free(sigtype); |
| 2700 | return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED-58; |
| 2701 | } |
| 2702 | |
| 2703 | int |
| 2704 | sshkey_sign(struct sshkey *key, |
| 2705 | u_char **sigp, size_t *lenp, |
| 2706 | const u_char *data, size_t datalen, |
| 2707 | const char *alg, const char *sk_provider, const char *sk_pin, u_int compat) |
| 2708 | { |
| 2709 | int was_shielded = sshkey_is_shielded(key); |
| 2710 | int r2, r = SSH_ERR_INTERNAL_ERROR-1; |
| 2711 | |
| 2712 | if (sigp != NULL((void*)0)) |
| 2713 | *sigp = NULL((void*)0); |
| 2714 | if (lenp != NULL((void*)0)) |
| 2715 | *lenp = 0; |
| 2716 | if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE(1 << 20)) |
| 2717 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2718 | if ((r = sshkey_unshield_private(key)) != 0) |
| 2719 | return r; |
| 2720 | switch (key->type) { |
| 2721 | #ifdef WITH_OPENSSL1 |
| 2722 | case KEY_DSA_CERT: |
| 2723 | case KEY_DSA: |
| 2724 | r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat); |
| 2725 | break; |
| 2726 | case KEY_ECDSA_CERT: |
| 2727 | case KEY_ECDSA: |
| 2728 | r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); |
| 2729 | break; |
| 2730 | case KEY_RSA_CERT: |
| 2731 | case KEY_RSA: |
| 2732 | r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg); |
| 2733 | break; |
| 2734 | #endif /* WITH_OPENSSL */ |
| 2735 | case KEY_ED25519: |
| 2736 | case KEY_ED25519_CERT: |
| 2737 | r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); |
| 2738 | break; |
| 2739 | case KEY_ED25519_SK: |
| 2740 | case KEY_ED25519_SK_CERT: |
| 2741 | case KEY_ECDSA_SK_CERT: |
| 2742 | case KEY_ECDSA_SK: |
| 2743 | r = sshsk_sign(sk_provider, key, sigp, lenp, data, |
| 2744 | datalen, compat, sk_pin); |
| 2745 | break; |
| 2746 | #ifdef WITH_XMSS |
| 2747 | case KEY_XMSS: |
| 2748 | case KEY_XMSS_CERT: |
| 2749 | r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat); |
| 2750 | break; |
| 2751 | #endif /* WITH_XMSS */ |
| 2752 | default: |
| 2753 | r = SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 2754 | break; |
| 2755 | } |
| 2756 | if (was_shielded && (r2 = sshkey_shield_private(key)) != 0) |
| 2757 | return r2; |
| 2758 | return r; |
| 2759 | } |
| 2760 | |
| 2761 | /* |
| 2762 | * ssh_key_verify returns 0 for a correct signature and < 0 on error. |
| 2763 | * If "alg" specified, then the signature must use that algorithm. |
| 2764 | */ |
| 2765 | int |
| 2766 | sshkey_verify(const struct sshkey *key, |
| 2767 | const u_char *sig, size_t siglen, |
| 2768 | const u_char *data, size_t dlen, const char *alg, u_int compat, |
| 2769 | struct sshkey_sig_details **detailsp) |
| 2770 | { |
| 2771 | if (detailsp != NULL((void*)0)) |
| 2772 | *detailsp = NULL((void*)0); |
| 2773 | if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE(1 << 20)) |
| 2774 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2775 | switch (key->type) { |
| 2776 | #ifdef WITH_OPENSSL1 |
| 2777 | case KEY_DSA_CERT: |
| 2778 | case KEY_DSA: |
| 2779 | return ssh_dss_verify(key, sig, siglen, data, dlen, compat); |
| 2780 | case KEY_ECDSA_CERT: |
| 2781 | case KEY_ECDSA: |
| 2782 | return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); |
| 2783 | case KEY_ECDSA_SK_CERT: |
| 2784 | case KEY_ECDSA_SK: |
| 2785 | return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen, |
| 2786 | compat, detailsp); |
| 2787 | case KEY_RSA_CERT: |
| 2788 | case KEY_RSA: |
| 2789 | return ssh_rsa_verify(key, sig, siglen, data, dlen, alg); |
| 2790 | #endif /* WITH_OPENSSL */ |
| 2791 | case KEY_ED25519: |
| 2792 | case KEY_ED25519_CERT: |
| 2793 | return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); |
| 2794 | case KEY_ED25519_SK: |
| 2795 | case KEY_ED25519_SK_CERT: |
| 2796 | return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen, |
| 2797 | compat, detailsp); |
| 2798 | #ifdef WITH_XMSS |
| 2799 | case KEY_XMSS: |
| 2800 | case KEY_XMSS_CERT: |
| 2801 | return ssh_xmss_verify(key, sig, siglen, data, dlen, compat); |
| 2802 | #endif /* WITH_XMSS */ |
| 2803 | default: |
| 2804 | return SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 2805 | } |
| 2806 | } |
| 2807 | |
| 2808 | /* Convert a plain key to their _CERT equivalent */ |
| 2809 | int |
| 2810 | sshkey_to_certified(struct sshkey *k) |
| 2811 | { |
| 2812 | int newtype; |
| 2813 | |
| 2814 | switch (k->type) { |
| 2815 | #ifdef WITH_OPENSSL1 |
| 2816 | case KEY_RSA: |
| 2817 | newtype = KEY_RSA_CERT; |
| 2818 | break; |
| 2819 | case KEY_DSA: |
| 2820 | newtype = KEY_DSA_CERT; |
| 2821 | break; |
| 2822 | case KEY_ECDSA: |
| 2823 | newtype = KEY_ECDSA_CERT; |
| 2824 | break; |
| 2825 | case KEY_ECDSA_SK: |
| 2826 | newtype = KEY_ECDSA_SK_CERT; |
| 2827 | break; |
| 2828 | #endif /* WITH_OPENSSL */ |
| 2829 | case KEY_ED25519_SK: |
| 2830 | newtype = KEY_ED25519_SK_CERT; |
| 2831 | break; |
| 2832 | case KEY_ED25519: |
| 2833 | newtype = KEY_ED25519_CERT; |
| 2834 | break; |
| 2835 | #ifdef WITH_XMSS |
| 2836 | case KEY_XMSS: |
| 2837 | newtype = KEY_XMSS_CERT; |
| 2838 | break; |
| 2839 | #endif /* WITH_XMSS */ |
| 2840 | default: |
| 2841 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2842 | } |
| 2843 | if ((k->cert = cert_new()) == NULL((void*)0)) |
| 2844 | return SSH_ERR_ALLOC_FAIL-2; |
| 2845 | k->type = newtype; |
| 2846 | return 0; |
| 2847 | } |
| 2848 | |
| 2849 | /* Convert a certificate to its raw key equivalent */ |
| 2850 | int |
| 2851 | sshkey_drop_cert(struct sshkey *k) |
| 2852 | { |
| 2853 | if (!sshkey_type_is_cert(k->type)) |
| 2854 | return SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 2855 | cert_free(k->cert); |
| 2856 | k->cert = NULL((void*)0); |
| 2857 | k->type = sshkey_type_plain(k->type); |
| 2858 | return 0; |
| 2859 | } |
| 2860 | |
| 2861 | /* Sign a certified key, (re-)generating the signed certblob. */ |
| 2862 | int |
| 2863 | sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg, |
| 2864 | const char *sk_provider, const char *sk_pin, |
| 2865 | sshkey_certify_signer *signer, void *signer_ctx) |
| 2866 | { |
| 2867 | struct sshbuf *principals = NULL((void*)0); |
| 2868 | u_char *ca_blob = NULL((void*)0), *sig_blob = NULL((void*)0), nonce[32]; |
| 2869 | size_t i, ca_len, sig_len; |
| 2870 | int ret = SSH_ERR_INTERNAL_ERROR-1; |
| 2871 | struct sshbuf *cert = NULL((void*)0); |
| 2872 | char *sigtype = NULL((void*)0); |
| 2873 | #ifdef WITH_OPENSSL1 |
| 2874 | const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| 2875 | #endif /* WITH_OPENSSL */ |
| 2876 | |
| 2877 | if (k == NULL((void*)0) || k->cert == NULL((void*)0) || |
| 2878 | k->cert->certblob == NULL((void*)0) || ca == NULL((void*)0)) |
| 2879 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2880 | if (!sshkey_is_cert(k)) |
| 2881 | return SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 2882 | if (!sshkey_type_is_valid_ca(ca->type)) |
| 2883 | return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19; |
| 2884 | |
| 2885 | /* |
| 2886 | * If no alg specified as argument but a signature_type was set, |
| 2887 | * then prefer that. If both were specified, then they must match. |
| 2888 | */ |
| 2889 | if (alg == NULL((void*)0)) |
| 2890 | alg = k->cert->signature_type; |
| 2891 | else if (k->cert->signature_type != NULL((void*)0) && |
| 2892 | strcmp(alg, k->cert->signature_type) != 0) |
| 2893 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 2894 | |
| 2895 | /* |
| 2896 | * If no signing algorithm or signature_type was specified and we're |
| 2897 | * using a RSA key, then default to a good signature algorithm. |
| 2898 | */ |
| 2899 | if (alg == NULL((void*)0) && ca->type == KEY_RSA) |
| 2900 | alg = "rsa-sha2-512"; |
| 2901 | |
| 2902 | if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) |
| 2903 | return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19; |
| 2904 | |
| 2905 | cert = k->cert->certblob; /* for readability */ |
| 2906 | sshbuf_reset(cert); |
| 2907 | if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) |
| 2908 | goto out; |
| 2909 | |
| 2910 | /* -v01 certs put nonce first */ |
| 2911 | arc4random_buf(&nonce, sizeof(nonce)); |
| 2912 | if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) |
| 2913 | goto out; |
| 2914 | |
| 2915 | /* XXX this substantially duplicates to_blob(); refactor */ |
| 2916 | switch (k->type) { |
| 2917 | #ifdef WITH_OPENSSL1 |
| 2918 | case KEY_DSA_CERT: |
| 2919 | DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); |
| 2920 | DSA_get0_key(k->dsa, &dsa_pub_key, NULL((void*)0)); |
| 2921 | if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 || |
| 2922 | (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 || |
| 2923 | (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 || |
| 2924 | (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0) |
| 2925 | goto out; |
| 2926 | break; |
| 2927 | case KEY_ECDSA_CERT: |
| 2928 | case KEY_ECDSA_SK_CERT: |
| 2929 | if ((ret = sshbuf_put_cstring(cert, |
| 2930 | sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 || |
| 2931 | (ret = sshbuf_put_ec(cert, |
| 2932 | EC_KEY_get0_public_key(k->ecdsa), |
| 2933 | EC_KEY_get0_group(k->ecdsa))) != 0) |
| 2934 | goto out; |
| 2935 | if (k->type == KEY_ECDSA_SK_CERT) { |
| 2936 | if ((ret = sshbuf_put_cstring(cert, |
| 2937 | k->sk_application)) != 0) |
| 2938 | goto out; |
| 2939 | } |
| 2940 | break; |
| 2941 | case KEY_RSA_CERT: |
| 2942 | RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL((void*)0)); |
| 2943 | if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 || |
| 2944 | (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0) |
| 2945 | goto out; |
| 2946 | break; |
| 2947 | #endif /* WITH_OPENSSL */ |
| 2948 | case KEY_ED25519_CERT: |
| 2949 | case KEY_ED25519_SK_CERT: |
| 2950 | if ((ret = sshbuf_put_string(cert, |
| 2951 | k->ed25519_pk, ED25519_PK_SZ32U)) != 0) |
| 2952 | goto out; |
| 2953 | if (k->type == KEY_ED25519_SK_CERT) { |
| 2954 | if ((ret = sshbuf_put_cstring(cert, |
| 2955 | k->sk_application)) != 0) |
| 2956 | goto out; |
| 2957 | } |
| 2958 | break; |
| 2959 | #ifdef WITH_XMSS |
| 2960 | case KEY_XMSS_CERT: |
| 2961 | if (k->xmss_name == NULL((void*)0)) { |
| 2962 | ret = SSH_ERR_INVALID_ARGUMENT-10; |
| 2963 | goto out; |
| 2964 | } |
| 2965 | if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) || |
| 2966 | (ret = sshbuf_put_string(cert, |
| 2967 | k->xmss_pk, sshkey_xmss_pklen(k))) != 0) |
| 2968 | goto out; |
| 2969 | break; |
| 2970 | #endif /* WITH_XMSS */ |
| 2971 | default: |
| 2972 | ret = SSH_ERR_INVALID_ARGUMENT-10; |
| 2973 | goto out; |
| 2974 | } |
| 2975 | |
| 2976 | if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || |
| 2977 | (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || |
| 2978 | (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) |
| 2979 | goto out; |
| 2980 | |
| 2981 | if ((principals = sshbuf_new()) == NULL((void*)0)) { |
| 2982 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 2983 | goto out; |
| 2984 | } |
| 2985 | for (i = 0; i < k->cert->nprincipals; i++) { |
| 2986 | if ((ret = sshbuf_put_cstring(principals, |
| 2987 | k->cert->principals[i])) != 0) |
| 2988 | goto out; |
| 2989 | } |
| 2990 | if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || |
| 2991 | (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || |
| 2992 | (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || |
| 2993 | (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || |
| 2994 | (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || |
| 2995 | (ret = sshbuf_put_string(cert, NULL((void*)0), 0)) != 0 || /* Reserved */ |
| 2996 | (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) |
| 2997 | goto out; |
| 2998 | |
| 2999 | /* Sign the whole mess */ |
| 3000 | if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), |
| 3001 | sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0) |
| 3002 | goto out; |
| 3003 | /* Check and update signature_type against what was actually used */ |
| 3004 | if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0) |
| 3005 | goto out; |
| 3006 | if (alg != NULL((void*)0) && strcmp(alg, sigtype) != 0) { |
| 3007 | ret = SSH_ERR_SIGN_ALG_UNSUPPORTED-58; |
| 3008 | goto out; |
| 3009 | } |
| 3010 | if (k->cert->signature_type == NULL((void*)0)) { |
| 3011 | k->cert->signature_type = sigtype; |
| 3012 | sigtype = NULL((void*)0); |
| 3013 | } |
| 3014 | /* Append signature and we are done */ |
| 3015 | if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) |
| 3016 | goto out; |
| 3017 | ret = 0; |
| 3018 | out: |
| 3019 | if (ret != 0) |
| 3020 | sshbuf_reset(cert); |
| 3021 | free(sig_blob); |
| 3022 | free(ca_blob); |
| 3023 | free(sigtype); |
| 3024 | sshbuf_free(principals); |
| 3025 | return ret; |
| 3026 | } |
| 3027 | |
| 3028 | static int |
| 3029 | default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp, |
| 3030 | const u_char *data, size_t datalen, |
| 3031 | const char *alg, const char *sk_provider, const char *sk_pin, |
| 3032 | u_int compat, void *ctx) |
| 3033 | { |
| 3034 | if (ctx != NULL((void*)0)) |
| 3035 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 3036 | return sshkey_sign(key, sigp, lenp, data, datalen, alg, |
| 3037 | sk_provider, sk_pin, compat); |
| 3038 | } |
| 3039 | |
| 3040 | int |
| 3041 | sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg, |
| 3042 | const char *sk_provider, const char *sk_pin) |
| 3043 | { |
| 3044 | return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin, |
| 3045 | default_key_sign, NULL((void*)0)); |
| 3046 | } |
| 3047 | |
| 3048 | int |
| 3049 | sshkey_cert_check_authority(const struct sshkey *k, |
| 3050 | int want_host, int require_principal, int wildcard_pattern, |
| 3051 | uint64_t verify_time, const char *name, const char **reason) |
| 3052 | { |
| 3053 | u_int i, principal_matches; |
| 3054 | |
| 3055 | if (reason == NULL((void*)0)) |
| 3056 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 3057 | if (!sshkey_is_cert(k)) { |
| 3058 | *reason = "Key is not a certificate"; |
| 3059 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3060 | } |
| 3061 | if (want_host) { |
| 3062 | if (k->cert->type != SSH2_CERT_TYPE_HOST2) { |
| 3063 | *reason = "Certificate invalid: not a host certificate"; |
| 3064 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3065 | } |
| 3066 | } else { |
| 3067 | if (k->cert->type != SSH2_CERT_TYPE_USER1) { |
| 3068 | *reason = "Certificate invalid: not a user certificate"; |
| 3069 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3070 | } |
| 3071 | } |
| 3072 | if (verify_time < k->cert->valid_after) { |
| 3073 | *reason = "Certificate invalid: not yet valid"; |
| 3074 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3075 | } |
| 3076 | if (verify_time >= k->cert->valid_before) { |
| 3077 | *reason = "Certificate invalid: expired"; |
| 3078 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3079 | } |
| 3080 | if (k->cert->nprincipals == 0) { |
| 3081 | if (require_principal) { |
| 3082 | *reason = "Certificate lacks principal list"; |
| 3083 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3084 | } |
| 3085 | } else if (name != NULL((void*)0)) { |
| 3086 | principal_matches = 0; |
| 3087 | for (i = 0; i < k->cert->nprincipals; i++) { |
| 3088 | if (wildcard_pattern) { |
| 3089 | if (match_pattern(k->cert->principals[i], |
| 3090 | name)) { |
| 3091 | principal_matches = 1; |
| 3092 | break; |
| 3093 | } |
| 3094 | } else if (strcmp(name, k->cert->principals[i]) == 0) { |
| 3095 | principal_matches = 1; |
| 3096 | break; |
| 3097 | } |
| 3098 | } |
| 3099 | if (!principal_matches) { |
| 3100 | *reason = "Certificate invalid: name is not a listed " |
| 3101 | "principal"; |
| 3102 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3103 | } |
| 3104 | } |
| 3105 | return 0; |
| 3106 | } |
| 3107 | |
| 3108 | int |
| 3109 | sshkey_cert_check_authority_now(const struct sshkey *k, |
| 3110 | int want_host, int require_principal, int wildcard_pattern, |
| 3111 | const char *name, const char **reason) |
| 3112 | { |
| 3113 | time_t now; |
| 3114 | |
| 3115 | if ((now = time(NULL((void*)0))) < 0) { |
| 3116 | /* yikes - system clock before epoch! */ |
| 3117 | *reason = "Certificate invalid: not yet valid"; |
| 3118 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3119 | } |
| 3120 | return sshkey_cert_check_authority(k, want_host, require_principal, |
| 3121 | wildcard_pattern, (uint64_t)now, name, reason); |
| 3122 | } |
| 3123 | |
| 3124 | int |
| 3125 | sshkey_cert_check_host(const struct sshkey *key, const char *host, |
| 3126 | int wildcard_principals, const char *ca_sign_algorithms, |
| 3127 | const char **reason) |
| 3128 | { |
| 3129 | int r; |
| 3130 | |
| 3131 | if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals, |
| 3132 | host, reason)) != 0) |
| 3133 | return r; |
| 3134 | if (sshbuf_len(key->cert->critical) != 0) { |
| 3135 | *reason = "Certificate contains unsupported critical options"; |
| 3136 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3137 | } |
| 3138 | if (ca_sign_algorithms != NULL((void*)0) && |
| 3139 | (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) { |
| 3140 | *reason = "Certificate signed with disallowed algorithm"; |
| 3141 | return SSH_ERR_KEY_CERT_INVALID-25; |
| 3142 | } |
| 3143 | return 0; |
| 3144 | } |
| 3145 | |
| 3146 | size_t |
| 3147 | sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l) |
| 3148 | { |
| 3149 | char from[32], to[32], ret[128]; |
| 3150 | |
| 3151 | *from = *to = '\0'; |
| 3152 | if (cert->valid_after == 0 && |
| 3153 | cert->valid_before == 0xffffffffffffffffULL) |
| 3154 | return strlcpy(s, "forever", l); |
| 3155 | |
| 3156 | if (cert->valid_after != 0) |
| 3157 | format_absolute_time(cert->valid_after, from, sizeof(from)); |
| 3158 | if (cert->valid_before != 0xffffffffffffffffULL) |
| 3159 | format_absolute_time(cert->valid_before, to, sizeof(to)); |
| 3160 | |
| 3161 | if (cert->valid_after == 0) |
| 3162 | snprintf(ret, sizeof(ret), "before %s", to); |
| 3163 | else if (cert->valid_before == 0xffffffffffffffffULL) |
| 3164 | snprintf(ret, sizeof(ret), "after %s", from); |
| 3165 | else |
| 3166 | snprintf(ret, sizeof(ret), "from %s to %s", from, to); |
| 3167 | |
| 3168 | return strlcpy(s, ret, l); |
| 3169 | } |
| 3170 | |
| 3171 | int |
| 3172 | sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf, |
| 3173 | enum sshkey_serialize_rep opts) |
| 3174 | { |
| 3175 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 3176 | int was_shielded = sshkey_is_shielded(key); |
| 3177 | struct sshbuf *b = NULL((void*)0); |
| 3178 | #ifdef WITH_OPENSSL1 |
| 3179 | const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q; |
| 3180 | const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key; |
| 3181 | #endif /* WITH_OPENSSL */ |
| 3182 | |
| 3183 | if ((r = sshkey_unshield_private(key)) != 0) |
| 3184 | return r; |
| 3185 | if ((b = sshbuf_new()) == NULL((void*)0)) |
| 3186 | return SSH_ERR_ALLOC_FAIL-2; |
| 3187 | if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) |
| 3188 | goto out; |
| 3189 | switch (key->type) { |
| 3190 | #ifdef WITH_OPENSSL1 |
| 3191 | case KEY_RSA: |
| 3192 | RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d); |
| 3193 | RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); |
| 3194 | RSA_get0_crt_params(key->rsa, NULL((void*)0), NULL((void*)0), &rsa_iqmp); |
| 3195 | if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 || |
| 3196 | (r = sshbuf_put_bignum2(b, rsa_e)) != 0 || |
| 3197 | (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || |
| 3198 | (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || |
| 3199 | (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || |
| 3200 | (r = sshbuf_put_bignum2(b, rsa_q)) != 0) |
| 3201 | goto out; |
| 3202 | break; |
| 3203 | case KEY_RSA_CERT: |
| 3204 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3205 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3206 | goto out; |
| 3207 | } |
| 3208 | RSA_get0_key(key->rsa, NULL((void*)0), NULL((void*)0), &rsa_d); |
| 3209 | RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); |
| 3210 | RSA_get0_crt_params(key->rsa, NULL((void*)0), NULL((void*)0), &rsa_iqmp); |
| 3211 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3212 | (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || |
| 3213 | (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || |
| 3214 | (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || |
| 3215 | (r = sshbuf_put_bignum2(b, rsa_q)) != 0) |
| 3216 | goto out; |
| 3217 | break; |
| 3218 | case KEY_DSA: |
| 3219 | DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); |
| 3220 | DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key); |
| 3221 | if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 || |
| 3222 | (r = sshbuf_put_bignum2(b, dsa_q)) != 0 || |
| 3223 | (r = sshbuf_put_bignum2(b, dsa_g)) != 0 || |
| 3224 | (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 || |
| 3225 | (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0) |
| 3226 | goto out; |
| 3227 | break; |
| 3228 | case KEY_DSA_CERT: |
| 3229 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3230 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3231 | goto out; |
| 3232 | } |
| 3233 | DSA_get0_key(key->dsa, NULL((void*)0), &dsa_priv_key); |
| 3234 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3235 | (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0) |
| 3236 | goto out; |
| 3237 | break; |
| 3238 | case KEY_ECDSA: |
| 3239 | if ((r = sshbuf_put_cstring(b, |
| 3240 | sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| 3241 | (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || |
| 3242 | (r = sshbuf_put_bignum2(b, |
| 3243 | EC_KEY_get0_private_key(key->ecdsa))) != 0) |
| 3244 | goto out; |
| 3245 | break; |
| 3246 | case KEY_ECDSA_CERT: |
| 3247 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3248 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3249 | goto out; |
| 3250 | } |
| 3251 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3252 | (r = sshbuf_put_bignum2(b, |
| 3253 | EC_KEY_get0_private_key(key->ecdsa))) != 0) |
| 3254 | goto out; |
| 3255 | break; |
| 3256 | case KEY_ECDSA_SK: |
| 3257 | if ((r = sshbuf_put_cstring(b, |
| 3258 | sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| 3259 | (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || |
| 3260 | (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || |
| 3261 | (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || |
| 3262 | (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || |
| 3263 | (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) |
| 3264 | goto out; |
| 3265 | break; |
| 3266 | case KEY_ECDSA_SK_CERT: |
| 3267 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3268 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3269 | goto out; |
| 3270 | } |
| 3271 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3272 | (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || |
| 3273 | (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || |
| 3274 | (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || |
| 3275 | (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) |
| 3276 | goto out; |
| 3277 | break; |
| 3278 | #endif /* WITH_OPENSSL */ |
| 3279 | case KEY_ED25519: |
| 3280 | if ((r = sshbuf_put_string(b, key->ed25519_pk, |
| 3281 | ED25519_PK_SZ32U)) != 0 || |
| 3282 | (r = sshbuf_put_string(b, key->ed25519_sk, |
| 3283 | ED25519_SK_SZ64U)) != 0) |
| 3284 | goto out; |
| 3285 | break; |
| 3286 | case KEY_ED25519_CERT: |
| 3287 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3288 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3289 | goto out; |
| 3290 | } |
| 3291 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3292 | (r = sshbuf_put_string(b, key->ed25519_pk, |
| 3293 | ED25519_PK_SZ32U)) != 0 || |
| 3294 | (r = sshbuf_put_string(b, key->ed25519_sk, |
| 3295 | ED25519_SK_SZ64U)) != 0) |
| 3296 | goto out; |
| 3297 | break; |
| 3298 | case KEY_ED25519_SK: |
| 3299 | if ((r = sshbuf_put_string(b, key->ed25519_pk, |
| 3300 | ED25519_PK_SZ32U)) != 0 || |
| 3301 | (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || |
| 3302 | (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || |
| 3303 | (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || |
| 3304 | (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) |
| 3305 | goto out; |
| 3306 | break; |
| 3307 | case KEY_ED25519_SK_CERT: |
| 3308 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0) { |
| 3309 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3310 | goto out; |
| 3311 | } |
| 3312 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3313 | (r = sshbuf_put_string(b, key->ed25519_pk, |
| 3314 | ED25519_PK_SZ32U)) != 0 || |
| 3315 | (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || |
| 3316 | (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || |
| 3317 | (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || |
| 3318 | (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) |
| 3319 | goto out; |
| 3320 | break; |
| 3321 | #ifdef WITH_XMSS |
| 3322 | case KEY_XMSS: |
| 3323 | if (key->xmss_name == NULL((void*)0)) { |
| 3324 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3325 | goto out; |
| 3326 | } |
| 3327 | if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| 3328 | (r = sshbuf_put_string(b, key->xmss_pk, |
| 3329 | sshkey_xmss_pklen(key))) != 0 || |
| 3330 | (r = sshbuf_put_string(b, key->xmss_sk, |
| 3331 | sshkey_xmss_sklen(key))) != 0 || |
| 3332 | (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) |
| 3333 | goto out; |
| 3334 | break; |
| 3335 | case KEY_XMSS_CERT: |
| 3336 | if (key->cert == NULL((void*)0) || sshbuf_len(key->cert->certblob) == 0 || |
| 3337 | key->xmss_name == NULL((void*)0)) { |
| 3338 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3339 | goto out; |
| 3340 | } |
| 3341 | if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| 3342 | (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| 3343 | (r = sshbuf_put_string(b, key->xmss_pk, |
| 3344 | sshkey_xmss_pklen(key))) != 0 || |
| 3345 | (r = sshbuf_put_string(b, key->xmss_sk, |
| 3346 | sshkey_xmss_sklen(key))) != 0 || |
| 3347 | (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) |
| 3348 | goto out; |
| 3349 | break; |
| 3350 | #endif /* WITH_XMSS */ |
| 3351 | default: |
| 3352 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3353 | goto out; |
| 3354 | } |
| 3355 | /* |
| 3356 | * success (but we still need to append the output to buf after |
| 3357 | * possibly re-shielding the private key) |
| 3358 | */ |
| 3359 | r = 0; |
| 3360 | out: |
| 3361 | if (was_shielded) |
| 3362 | r = sshkey_shield_private(key); |
| 3363 | if (r == 0) |
| 3364 | r = sshbuf_putb(buf, b); |
| 3365 | sshbuf_free(b); |
| 3366 | |
| 3367 | return r; |
| 3368 | } |
| 3369 | |
| 3370 | int |
| 3371 | sshkey_private_serialize(struct sshkey *key, struct sshbuf *b) |
| 3372 | { |
| 3373 | return sshkey_private_serialize_opt(key, b, |
| 3374 | SSHKEY_SERIALIZE_DEFAULT); |
| 3375 | } |
| 3376 | |
| 3377 | int |
| 3378 | sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) |
| 3379 | { |
| 3380 | char *tname = NULL((void*)0), *curve = NULL((void*)0), *xmss_name = NULL((void*)0); |
| 3381 | char *expect_sk_application = NULL((void*)0); |
| 3382 | struct sshkey *k = NULL((void*)0); |
| 3383 | size_t pklen = 0, sklen = 0; |
| 3384 | int type, r = SSH_ERR_INTERNAL_ERROR-1; |
| 3385 | u_char *ed25519_pk = NULL((void*)0), *ed25519_sk = NULL((void*)0); |
| 3386 | u_char *expect_ed25519_pk = NULL((void*)0); |
| 3387 | u_char *xmss_pk = NULL((void*)0), *xmss_sk = NULL((void*)0); |
| 3388 | #ifdef WITH_OPENSSL1 |
| 3389 | BIGNUM *exponent = NULL((void*)0); |
| 3390 | BIGNUM *rsa_n = NULL((void*)0), *rsa_e = NULL((void*)0), *rsa_d = NULL((void*)0); |
| 3391 | BIGNUM *rsa_iqmp = NULL((void*)0), *rsa_p = NULL((void*)0), *rsa_q = NULL((void*)0); |
| 3392 | BIGNUM *dsa_p = NULL((void*)0), *dsa_q = NULL((void*)0), *dsa_g = NULL((void*)0); |
| 3393 | BIGNUM *dsa_pub_key = NULL((void*)0), *dsa_priv_key = NULL((void*)0); |
| 3394 | #endif /* WITH_OPENSSL */ |
| 3395 | |
| 3396 | if (kp != NULL((void*)0)) |
| 3397 | *kp = NULL((void*)0); |
| 3398 | if ((r = sshbuf_get_cstring(buf, &tname, NULL((void*)0))) != 0) |
| 3399 | goto out; |
| 3400 | type = sshkey_type_from_name(tname); |
| 3401 | if (sshkey_type_is_cert(type)) { |
| 3402 | /* |
| 3403 | * Certificate key private keys begin with the certificate |
| 3404 | * itself. Make sure this matches the type of the enclosing |
| 3405 | * private key. |
| 3406 | */ |
| 3407 | if ((r = sshkey_froms(buf, &k)) != 0) |
| 3408 | goto out; |
| 3409 | if (k->type != type) { |
| 3410 | r = SSH_ERR_KEY_CERT_MISMATCH-45; |
| 3411 | goto out; |
| 3412 | } |
| 3413 | /* For ECDSA keys, the group must match too */ |
| 3414 | if (k->type == KEY_ECDSA && |
| 3415 | k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) { |
| 3416 | r = SSH_ERR_KEY_CERT_MISMATCH-45; |
| 3417 | goto out; |
| 3418 | } |
| 3419 | /* |
| 3420 | * Several fields are redundant between certificate and |
| 3421 | * private key body, we require these to match. |
| 3422 | */ |
| 3423 | expect_sk_application = k->sk_application; |
| 3424 | expect_ed25519_pk = k->ed25519_pk; |
| 3425 | k->sk_application = NULL((void*)0); |
| 3426 | k->ed25519_pk = NULL((void*)0); |
| 3427 | } else { |
| 3428 | if ((k = sshkey_new(type)) == NULL((void*)0)) { |
| 3429 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3430 | goto out; |
| 3431 | } |
| 3432 | } |
| 3433 | switch (type) { |
| 3434 | #ifdef WITH_OPENSSL1 |
| 3435 | case KEY_DSA: |
| 3436 | if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 || |
| 3437 | (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 || |
| 3438 | (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 || |
| 3439 | (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0) |
| 3440 | goto out; |
| 3441 | if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) { |
| 3442 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3443 | goto out; |
| 3444 | } |
| 3445 | dsa_p = dsa_q = dsa_g = NULL((void*)0); /* transferred */ |
| 3446 | if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL((void*)0))) { |
| 3447 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3448 | goto out; |
| 3449 | } |
| 3450 | dsa_pub_key = NULL((void*)0); /* transferred */ |
| 3451 | /* FALLTHROUGH */ |
| 3452 | case KEY_DSA_CERT: |
| 3453 | if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0) |
| 3454 | goto out; |
| 3455 | if (!DSA_set0_key(k->dsa, NULL((void*)0), dsa_priv_key)) { |
| 3456 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3457 | goto out; |
| 3458 | } |
| 3459 | dsa_priv_key = NULL((void*)0); /* transferred */ |
| 3460 | break; |
| 3461 | case KEY_ECDSA: |
| 3462 | if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { |
| 3463 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3464 | goto out; |
| 3465 | } |
| 3466 | if ((r = sshbuf_get_cstring(buf, &curve, NULL((void*)0))) != 0) |
| 3467 | goto out; |
| 3468 | if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| 3469 | r = SSH_ERR_EC_CURVE_MISMATCH-15; |
| 3470 | goto out; |
| 3471 | } |
| 3472 | k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| 3473 | if (k->ecdsa == NULL((void*)0)) { |
| 3474 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3475 | goto out; |
| 3476 | } |
| 3477 | if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0) |
| 3478 | goto out; |
| 3479 | /* FALLTHROUGH */ |
| 3480 | case KEY_ECDSA_CERT: |
| 3481 | if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0) |
| 3482 | goto out; |
| 3483 | if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { |
| 3484 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3485 | goto out; |
| 3486 | } |
| 3487 | if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), |
| 3488 | EC_KEY_get0_public_key(k->ecdsa))) != 0 || |
| 3489 | (r = sshkey_ec_validate_private(k->ecdsa)) != 0) |
| 3490 | goto out; |
| 3491 | break; |
| 3492 | case KEY_ECDSA_SK: |
| 3493 | if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { |
| 3494 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3495 | goto out; |
| 3496 | } |
| 3497 | if ((r = sshbuf_get_cstring(buf, &curve, NULL((void*)0))) != 0) |
| 3498 | goto out; |
| 3499 | if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| 3500 | r = SSH_ERR_EC_CURVE_MISMATCH-15; |
| 3501 | goto out; |
| 3502 | } |
| 3503 | if ((k->sk_key_handle = sshbuf_new()) == NULL((void*)0) || |
| 3504 | (k->sk_reserved = sshbuf_new()) == NULL((void*)0)) { |
| 3505 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3506 | goto out; |
| 3507 | } |
| 3508 | k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| 3509 | if (k->ecdsa == NULL((void*)0)) { |
| 3510 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3511 | goto out; |
| 3512 | } |
| 3513 | if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 || |
| 3514 | (r = sshbuf_get_cstring(buf, &k->sk_application, |
| 3515 | NULL((void*)0))) != 0 || |
| 3516 | (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || |
| 3517 | (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || |
| 3518 | (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) |
| 3519 | goto out; |
| 3520 | if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), |
| 3521 | EC_KEY_get0_public_key(k->ecdsa))) != 0) |
| 3522 | goto out; |
| 3523 | break; |
| 3524 | case KEY_ECDSA_SK_CERT: |
| 3525 | if ((k->sk_key_handle = sshbuf_new()) == NULL((void*)0) || |
| 3526 | (k->sk_reserved = sshbuf_new()) == NULL((void*)0)) { |
| 3527 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3528 | goto out; |
| 3529 | } |
| 3530 | if ((r = sshbuf_get_cstring(buf, &k->sk_application, |
| 3531 | NULL((void*)0))) != 0 || |
| 3532 | (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || |
| 3533 | (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || |
| 3534 | (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) |
| 3535 | goto out; |
| 3536 | if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), |
| 3537 | EC_KEY_get0_public_key(k->ecdsa))) != 0) |
| 3538 | goto out; |
| 3539 | break; |
| 3540 | case KEY_RSA: |
| 3541 | if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 || |
| 3542 | (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0) |
| 3543 | goto out; |
| 3544 | if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL((void*)0))) { |
| 3545 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3546 | goto out; |
| 3547 | } |
| 3548 | rsa_n = rsa_e = NULL((void*)0); /* transferred */ |
| 3549 | /* FALLTHROUGH */ |
| 3550 | case KEY_RSA_CERT: |
| 3551 | if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 || |
| 3552 | (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 || |
| 3553 | (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 || |
| 3554 | (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0) |
| 3555 | goto out; |
| 3556 | if (!RSA_set0_key(k->rsa, NULL((void*)0), NULL((void*)0), rsa_d)) { |
| 3557 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3558 | goto out; |
| 3559 | } |
| 3560 | rsa_d = NULL((void*)0); /* transferred */ |
| 3561 | if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) { |
| 3562 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3563 | goto out; |
| 3564 | } |
| 3565 | rsa_p = rsa_q = NULL((void*)0); /* transferred */ |
| 3566 | if ((r = check_rsa_length(k->rsa)) != 0) |
| 3567 | goto out; |
| 3568 | if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0) |
| 3569 | goto out; |
| 3570 | break; |
| 3571 | #endif /* WITH_OPENSSL */ |
| 3572 | case KEY_ED25519: |
| 3573 | case KEY_ED25519_CERT: |
| 3574 | if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || |
| 3575 | (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) |
| 3576 | goto out; |
| 3577 | if (pklen != ED25519_PK_SZ32U || sklen != ED25519_SK_SZ64U) { |
| 3578 | r = SSH_ERR_INVALID_FORMAT-4; |
| 3579 | goto out; |
| 3580 | } |
| 3581 | k->ed25519_pk = ed25519_pk; |
| 3582 | k->ed25519_sk = ed25519_sk; |
| 3583 | ed25519_pk = ed25519_sk = NULL((void*)0); /* transferred */ |
| 3584 | break; |
| 3585 | case KEY_ED25519_SK: |
| 3586 | case KEY_ED25519_SK_CERT: |
| 3587 | if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0) |
| 3588 | goto out; |
| 3589 | if (pklen != ED25519_PK_SZ32U) { |
| 3590 | r = SSH_ERR_INVALID_FORMAT-4; |
| 3591 | goto out; |
| 3592 | } |
| 3593 | if ((k->sk_key_handle = sshbuf_new()) == NULL((void*)0) || |
| 3594 | (k->sk_reserved = sshbuf_new()) == NULL((void*)0)) { |
| 3595 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3596 | goto out; |
| 3597 | } |
| 3598 | if ((r = sshbuf_get_cstring(buf, &k->sk_application, |
| 3599 | NULL((void*)0))) != 0 || |
| 3600 | (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || |
| 3601 | (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || |
| 3602 | (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) |
| 3603 | goto out; |
| 3604 | k->ed25519_pk = ed25519_pk; |
| 3605 | ed25519_pk = NULL((void*)0); /* transferred */ |
| 3606 | break; |
| 3607 | #ifdef WITH_XMSS |
| 3608 | case KEY_XMSS: |
| 3609 | case KEY_XMSS_CERT: |
| 3610 | if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL((void*)0))) != 0 || |
| 3611 | (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 || |
| 3612 | (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0) |
| 3613 | goto out; |
| 3614 | if (type == KEY_XMSS && |
| 3615 | (r = sshkey_xmss_init(k, xmss_name)) != 0) |
| 3616 | goto out; |
| 3617 | if (pklen != sshkey_xmss_pklen(k) || |
| 3618 | sklen != sshkey_xmss_sklen(k)) { |
| 3619 | r = SSH_ERR_INVALID_FORMAT-4; |
| 3620 | goto out; |
| 3621 | } |
| 3622 | k->xmss_pk = xmss_pk; |
| 3623 | k->xmss_sk = xmss_sk; |
| 3624 | xmss_pk = xmss_sk = NULL((void*)0); |
| 3625 | /* optional internal state */ |
| 3626 | if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0) |
| 3627 | goto out; |
| 3628 | break; |
| 3629 | #endif /* WITH_XMSS */ |
| 3630 | default: |
| 3631 | r = SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 3632 | goto out; |
| 3633 | } |
| 3634 | #ifdef WITH_OPENSSL1 |
| 3635 | /* enable blinding */ |
| 3636 | switch (k->type) { |
| 3637 | case KEY_RSA: |
| 3638 | case KEY_RSA_CERT: |
| 3639 | if (RSA_blinding_on(k->rsa, NULL((void*)0)) != 1) { |
| 3640 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3641 | goto out; |
| 3642 | } |
| 3643 | break; |
| 3644 | } |
| 3645 | #endif /* WITH_OPENSSL */ |
| 3646 | if ((expect_sk_application != NULL((void*)0) && (k->sk_application == NULL((void*)0) || |
| 3647 | strcmp(expect_sk_application, k->sk_application) != 0)) || |
| 3648 | (expect_ed25519_pk != NULL((void*)0) && (k->ed25519_pk == NULL((void*)0) || |
| 3649 | memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ32U) != 0))) { |
| 3650 | r = SSH_ERR_KEY_CERT_MISMATCH-45; |
| 3651 | goto out; |
| 3652 | } |
| 3653 | /* success */ |
| 3654 | r = 0; |
| 3655 | if (kp != NULL((void*)0)) { |
| 3656 | *kp = k; |
| 3657 | k = NULL((void*)0); |
| 3658 | } |
| 3659 | out: |
| 3660 | free(tname); |
| 3661 | free(curve); |
| 3662 | #ifdef WITH_OPENSSL1 |
| 3663 | BN_clear_free(exponent); |
| 3664 | BN_clear_free(dsa_p); |
| 3665 | BN_clear_free(dsa_q); |
| 3666 | BN_clear_free(dsa_g); |
| 3667 | BN_clear_free(dsa_pub_key); |
| 3668 | BN_clear_free(dsa_priv_key); |
| 3669 | BN_clear_free(rsa_n); |
| 3670 | BN_clear_free(rsa_e); |
| 3671 | BN_clear_free(rsa_d); |
| 3672 | BN_clear_free(rsa_p); |
| 3673 | BN_clear_free(rsa_q); |
| 3674 | BN_clear_free(rsa_iqmp); |
| 3675 | #endif /* WITH_OPENSSL */ |
| 3676 | sshkey_free(k); |
| 3677 | freezero(ed25519_pk, pklen); |
| 3678 | freezero(ed25519_sk, sklen); |
| 3679 | free(xmss_name); |
| 3680 | freezero(xmss_pk, pklen); |
| 3681 | freezero(xmss_sk, sklen); |
| 3682 | free(expect_sk_application); |
| 3683 | free(expect_ed25519_pk); |
| 3684 | return r; |
| 3685 | } |
| 3686 | |
| 3687 | #ifdef WITH_OPENSSL1 |
| 3688 | int |
| 3689 | sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) |
| 3690 | { |
| 3691 | EC_POINT *nq = NULL((void*)0); |
| 3692 | BIGNUM *order = NULL((void*)0), *x = NULL((void*)0), *y = NULL((void*)0), *tmp = NULL((void*)0); |
| 3693 | int ret = SSH_ERR_KEY_INVALID_EC_VALUE-20; |
| 3694 | |
| 3695 | /* |
| 3696 | * NB. This assumes OpenSSL has already verified that the public |
| 3697 | * point lies on the curve. This is done by EC_POINT_oct2point() |
| 3698 | * implicitly calling EC_POINT_is_on_curve(). If this code is ever |
| 3699 | * reachable with public points not unmarshalled using |
| 3700 | * EC_POINT_oct2point then the caller will need to explicitly check. |
| 3701 | */ |
| 3702 | |
| 3703 | /* |
| 3704 | * We shouldn't ever hit this case because bignum_get_ecpoint() |
| 3705 | * refuses to load GF2m points. |
| 3706 | */ |
| 3707 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| 3708 | NID_X9_62_prime_field406) |
| 3709 | goto out; |
| 3710 | |
| 3711 | /* Q != infinity */ |
| 3712 | if (EC_POINT_is_at_infinity(group, public)) |
| 3713 | goto out; |
| 3714 | |
| 3715 | if ((x = BN_new()) == NULL((void*)0) || |
| 3716 | (y = BN_new()) == NULL((void*)0) || |
| 3717 | (order = BN_new()) == NULL((void*)0) || |
| 3718 | (tmp = BN_new()) == NULL((void*)0)) { |
| 3719 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 3720 | goto out; |
| 3721 | } |
| 3722 | |
| 3723 | /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ |
| 3724 | if (EC_GROUP_get_order(group, order, NULL((void*)0)) != 1 || |
| 3725 | EC_POINT_get_affine_coordinates_GFp(group, public, |
| 3726 | x, y, NULL((void*)0)) != 1) { |
| 3727 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3728 | goto out; |
| 3729 | } |
| 3730 | if (BN_num_bits(x) <= BN_num_bits(order) / 2 || |
| 3731 | BN_num_bits(y) <= BN_num_bits(order) / 2) |
| 3732 | goto out; |
| 3733 | |
| 3734 | /* nQ == infinity (n == order of subgroup) */ |
| 3735 | if ((nq = EC_POINT_new(group)) == NULL((void*)0)) { |
| 3736 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 3737 | goto out; |
| 3738 | } |
| 3739 | if (EC_POINT_mul(group, nq, NULL((void*)0), public, order, NULL((void*)0)) != 1) { |
| 3740 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3741 | goto out; |
| 3742 | } |
| 3743 | if (EC_POINT_is_at_infinity(group, nq) != 1) |
| 3744 | goto out; |
| 3745 | |
| 3746 | /* x < order - 1, y < order - 1 */ |
| 3747 | if (!BN_sub(tmp, order, BN_value_one())) { |
| 3748 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3749 | goto out; |
| 3750 | } |
| 3751 | if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) |
| 3752 | goto out; |
| 3753 | ret = 0; |
| 3754 | out: |
| 3755 | BN_clear_free(x); |
| 3756 | BN_clear_free(y); |
| 3757 | BN_clear_free(order); |
| 3758 | BN_clear_free(tmp); |
| 3759 | EC_POINT_free(nq); |
| 3760 | return ret; |
| 3761 | } |
| 3762 | |
| 3763 | int |
| 3764 | sshkey_ec_validate_private(const EC_KEY *key) |
| 3765 | { |
| 3766 | BIGNUM *order = NULL((void*)0), *tmp = NULL((void*)0); |
| 3767 | int ret = SSH_ERR_KEY_INVALID_EC_VALUE-20; |
| 3768 | |
| 3769 | if ((order = BN_new()) == NULL((void*)0) || (tmp = BN_new()) == NULL((void*)0)) { |
| 3770 | ret = SSH_ERR_ALLOC_FAIL-2; |
| 3771 | goto out; |
| 3772 | } |
| 3773 | |
| 3774 | /* log2(private) > log2(order)/2 */ |
| 3775 | if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL((void*)0)) != 1) { |
| 3776 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3777 | goto out; |
| 3778 | } |
| 3779 | if (BN_num_bits(EC_KEY_get0_private_key(key)) <= |
| 3780 | BN_num_bits(order) / 2) |
| 3781 | goto out; |
| 3782 | |
| 3783 | /* private < order - 1 */ |
| 3784 | if (!BN_sub(tmp, order, BN_value_one())) { |
| 3785 | ret = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 3786 | goto out; |
| 3787 | } |
| 3788 | if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) |
| 3789 | goto out; |
| 3790 | ret = 0; |
| 3791 | out: |
| 3792 | BN_clear_free(order); |
| 3793 | BN_clear_free(tmp); |
| 3794 | return ret; |
| 3795 | } |
| 3796 | |
| 3797 | void |
| 3798 | sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) |
| 3799 | { |
| 3800 | BIGNUM *x = NULL((void*)0), *y = NULL((void*)0); |
| 3801 | |
| 3802 | if (point == NULL((void*)0)) { |
| 3803 | fputs("point=(NULL)\n", stderr(&__sF[2])); |
| 3804 | return; |
| 3805 | } |
| 3806 | if ((x = BN_new()) == NULL((void*)0) || (y = BN_new()) == NULL((void*)0)) { |
| 3807 | fprintf(stderr(&__sF[2]), "%s: BN_new failed\n", __func__); |
| 3808 | goto out; |
| 3809 | } |
| 3810 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| 3811 | NID_X9_62_prime_field406) { |
| 3812 | fprintf(stderr(&__sF[2]), "%s: group is not a prime field\n", __func__); |
| 3813 | goto out; |
| 3814 | } |
| 3815 | if (EC_POINT_get_affine_coordinates_GFp(group, point, |
| 3816 | x, y, NULL((void*)0)) != 1) { |
| 3817 | fprintf(stderr(&__sF[2]), "%s: EC_POINT_get_affine_coordinates_GFp\n", |
| 3818 | __func__); |
| 3819 | goto out; |
| 3820 | } |
| 3821 | fputs("x=", stderr(&__sF[2])); |
| 3822 | BN_print_fp(stderr(&__sF[2]), x); |
| 3823 | fputs("\ny=", stderr(&__sF[2])); |
| 3824 | BN_print_fp(stderr(&__sF[2]), y); |
| 3825 | fputs("\n", stderr(&__sF[2])); |
| 3826 | out: |
| 3827 | BN_clear_free(x); |
| 3828 | BN_clear_free(y); |
| 3829 | } |
| 3830 | |
| 3831 | void |
| 3832 | sshkey_dump_ec_key(const EC_KEY *key) |
| 3833 | { |
| 3834 | const BIGNUM *exponent; |
| 3835 | |
| 3836 | sshkey_dump_ec_point(EC_KEY_get0_group(key), |
| 3837 | EC_KEY_get0_public_key(key)); |
| 3838 | fputs("exponent=", stderr(&__sF[2])); |
| 3839 | if ((exponent = EC_KEY_get0_private_key(key)) == NULL((void*)0)) |
| 3840 | fputs("(NULL)", stderr(&__sF[2])); |
| 3841 | else |
| 3842 | BN_print_fp(stderr(&__sF[2]), EC_KEY_get0_private_key(key)); |
| 3843 | fputs("\n", stderr(&__sF[2])); |
| 3844 | } |
| 3845 | #endif /* WITH_OPENSSL */ |
| 3846 | |
| 3847 | static int |
| 3848 | sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob, |
| 3849 | const char *passphrase, const char *comment, const char *ciphername, |
| 3850 | int rounds) |
| 3851 | { |
| 3852 | u_char *cp, *key = NULL((void*)0), *pubkeyblob = NULL((void*)0); |
| 3853 | u_char salt[SALT_LEN16]; |
| 3854 | char *b64 = NULL((void*)0); |
| 3855 | size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; |
| 3856 | u_int check; |
| 3857 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 3858 | struct sshcipher_ctx *ciphercontext = NULL((void*)0); |
| 3859 | const struct sshcipher *cipher; |
| 3860 | const char *kdfname = KDFNAME"bcrypt"; |
| 3861 | struct sshbuf *encoded = NULL((void*)0), *encrypted = NULL((void*)0), *kdf = NULL((void*)0); |
| 3862 | |
| 3863 | if (rounds <= 0) |
| 3864 | rounds = DEFAULT_ROUNDS16; |
| 3865 | if (passphrase == NULL((void*)0) || !strlen(passphrase)) { |
| 3866 | ciphername = "none"; |
| 3867 | kdfname = "none"; |
| 3868 | } else if (ciphername == NULL((void*)0)) |
| 3869 | ciphername = DEFAULT_CIPHERNAME"aes256-ctr"; |
| 3870 | if ((cipher = cipher_by_name(ciphername)) == NULL((void*)0)) { |
| 3871 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3872 | goto out; |
| 3873 | } |
| 3874 | |
| 3875 | if ((kdf = sshbuf_new()) == NULL((void*)0) || |
| 3876 | (encoded = sshbuf_new()) == NULL((void*)0) || |
| 3877 | (encrypted = sshbuf_new()) == NULL((void*)0)) { |
| 3878 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3879 | goto out; |
| 3880 | } |
| 3881 | blocksize = cipher_blocksize(cipher); |
| 3882 | keylen = cipher_keylen(cipher); |
| 3883 | ivlen = cipher_ivlen(cipher); |
| 3884 | authlen = cipher_authlen(cipher); |
| 3885 | if ((key = calloc(1, keylen + ivlen)) == NULL((void*)0)) { |
| 3886 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3887 | goto out; |
| 3888 | } |
| 3889 | if (strcmp(kdfname, "bcrypt") == 0) { |
| 3890 | arc4random_buf(salt, SALT_LEN16); |
| 3891 | if (bcrypt_pbkdf(passphrase, strlen(passphrase), |
| 3892 | salt, SALT_LEN16, key, keylen + ivlen, rounds) < 0) { |
| 3893 | r = SSH_ERR_INVALID_ARGUMENT-10; |
| 3894 | goto out; |
| 3895 | } |
| 3896 | if ((r = sshbuf_put_string(kdf, salt, SALT_LEN16)) != 0 || |
| 3897 | (r = sshbuf_put_u32(kdf, rounds)) != 0) |
| 3898 | goto out; |
| 3899 | } else if (strcmp(kdfname, "none") != 0) { |
| 3900 | /* Unsupported KDF type */ |
| 3901 | r = SSH_ERR_KEY_UNKNOWN_CIPHER-42; |
| 3902 | goto out; |
| 3903 | } |
| 3904 | if ((r = cipher_init(&ciphercontext, cipher, key, keylen, |
| 3905 | key + keylen, ivlen, 1)) != 0) |
| 3906 | goto out; |
| 3907 | |
| 3908 | if ((r = sshbuf_put(encoded, AUTH_MAGIC"openssh-key-v1", sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 || |
| 3909 | (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || |
| 3910 | (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || |
| 3911 | (r = sshbuf_put_stringb(encoded, kdf)) != 0 || |
| 3912 | (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ |
| 3913 | (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || |
| 3914 | (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) |
| 3915 | goto out; |
| 3916 | |
| 3917 | /* set up the buffer that will be encrypted */ |
| 3918 | |
| 3919 | /* Random check bytes */ |
| 3920 | check = arc4random(); |
| 3921 | if ((r = sshbuf_put_u32(encrypted, check)) != 0 || |
| 3922 | (r = sshbuf_put_u32(encrypted, check)) != 0) |
| 3923 | goto out; |
| 3924 | |
| 3925 | /* append private key and comment*/ |
| 3926 | if ((r = sshkey_private_serialize_opt(prv, encrypted, |
| 3927 | SSHKEY_SERIALIZE_FULL)) != 0 || |
| 3928 | (r = sshbuf_put_cstring(encrypted, comment)) != 0) |
| 3929 | goto out; |
| 3930 | |
| 3931 | /* padding */ |
| 3932 | i = 0; |
| 3933 | while (sshbuf_len(encrypted) % blocksize) { |
| 3934 | if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) |
| 3935 | goto out; |
| 3936 | } |
| 3937 | |
| 3938 | /* length in destination buffer */ |
| 3939 | if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) |
| 3940 | goto out; |
| 3941 | |
| 3942 | /* encrypt */ |
| 3943 | if ((r = sshbuf_reserve(encoded, |
| 3944 | sshbuf_len(encrypted) + authlen, &cp)) != 0) |
| 3945 | goto out; |
| 3946 | if ((r = cipher_crypt(ciphercontext, 0, cp, |
| 3947 | sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) |
| 3948 | goto out; |
| 3949 | |
| 3950 | sshbuf_reset(blob); |
| 3951 | |
| 3952 | /* assemble uuencoded key */ |
| 3953 | if ((r = sshbuf_put(blob, MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n", MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1))) != 0 || |
| 3954 | (r = sshbuf_dtob64(encoded, blob, 1)) != 0 || |
| 3955 | (r = sshbuf_put(blob, MARK_END"-----END OPENSSH PRIVATE KEY-----\n", MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1))) != 0) |
| 3956 | goto out; |
| 3957 | |
| 3958 | /* success */ |
| 3959 | r = 0; |
| 3960 | |
| 3961 | out: |
| 3962 | sshbuf_free(kdf); |
| 3963 | sshbuf_free(encoded); |
| 3964 | sshbuf_free(encrypted); |
| 3965 | cipher_free(ciphercontext); |
| 3966 | explicit_bzero(salt, sizeof(salt)); |
| 3967 | if (key != NULL((void*)0)) |
| 3968 | freezero(key, keylen + ivlen); |
| 3969 | if (pubkeyblob != NULL((void*)0)) |
| 3970 | freezero(pubkeyblob, pubkeylen); |
| 3971 | if (b64 != NULL((void*)0)) |
| 3972 | freezero(b64, strlen(b64)); |
| 3973 | return r; |
| 3974 | } |
| 3975 | |
| 3976 | static int |
| 3977 | private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp) |
| 3978 | { |
| 3979 | const u_char *cp; |
| 3980 | size_t encoded_len; |
| 3981 | int r; |
| 3982 | u_char last; |
| 3983 | struct sshbuf *encoded = NULL((void*)0), *decoded = NULL((void*)0); |
| 3984 | |
| 3985 | if (blob == NULL((void*)0) || decodedp == NULL((void*)0)) |
| 3986 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 3987 | |
| 3988 | *decodedp = NULL((void*)0); |
| 3989 | |
| 3990 | if ((encoded = sshbuf_new()) == NULL((void*)0) || |
| 3991 | (decoded = sshbuf_new()) == NULL((void*)0)) { |
| 3992 | r = SSH_ERR_ALLOC_FAIL-2; |
| 3993 | goto out; |
| 3994 | } |
| 3995 | |
| 3996 | /* check preamble */ |
| 3997 | cp = sshbuf_ptr(blob); |
| 3998 | encoded_len = sshbuf_len(blob); |
| 3999 | if (encoded_len < (MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1) + MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1)) || |
| 4000 | memcmp(cp, MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n", MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1)) != 0) { |
| 4001 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4002 | goto out; |
| 4003 | } |
| 4004 | cp += MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1); |
| 4005 | encoded_len -= MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1); |
| 4006 | |
| 4007 | /* Look for end marker, removing whitespace as we go */ |
| 4008 | while (encoded_len > 0) { |
| 4009 | if (*cp != '\n' && *cp != '\r') { |
| 4010 | if ((r = sshbuf_put_u8(encoded, *cp)) != 0) |
| 4011 | goto out; |
| 4012 | } |
| 4013 | last = *cp; |
| 4014 | encoded_len--; |
| 4015 | cp++; |
| 4016 | if (last == '\n') { |
| 4017 | if (encoded_len >= MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1) && |
| 4018 | memcmp(cp, MARK_END"-----END OPENSSH PRIVATE KEY-----\n", MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1)) == 0) { |
| 4019 | /* \0 terminate */ |
| 4020 | if ((r = sshbuf_put_u8(encoded, 0)) != 0) |
| 4021 | goto out; |
| 4022 | break; |
| 4023 | } |
| 4024 | } |
| 4025 | } |
| 4026 | if (encoded_len == 0) { |
| 4027 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4028 | goto out; |
| 4029 | } |
| 4030 | |
| 4031 | /* decode base64 */ |
| 4032 | if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0) |
| 4033 | goto out; |
| 4034 | |
| 4035 | /* check magic */ |
| 4036 | if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC"openssh-key-v1") || |
| 4037 | memcmp(sshbuf_ptr(decoded), AUTH_MAGIC"openssh-key-v1", sizeof(AUTH_MAGIC"openssh-key-v1"))) { |
| 4038 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4039 | goto out; |
| 4040 | } |
| 4041 | /* success */ |
| 4042 | *decodedp = decoded; |
| 4043 | decoded = NULL((void*)0); |
| 4044 | r = 0; |
| 4045 | out: |
| 4046 | sshbuf_free(encoded); |
| 4047 | sshbuf_free(decoded); |
| 4048 | return r; |
| 4049 | } |
| 4050 | |
| 4051 | static int |
| 4052 | private2_decrypt(struct sshbuf *decoded, const char *passphrase, |
| 4053 | struct sshbuf **decryptedp, struct sshkey **pubkeyp) |
| 4054 | { |
| 4055 | char *ciphername = NULL((void*)0), *kdfname = NULL((void*)0); |
| 4056 | const struct sshcipher *cipher = NULL((void*)0); |
| 4057 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4058 | size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0; |
| 4059 | struct sshbuf *kdf = NULL((void*)0), *decrypted = NULL((void*)0); |
| 4060 | struct sshcipher_ctx *ciphercontext = NULL((void*)0); |
| 4061 | struct sshkey *pubkey = NULL((void*)0); |
| 4062 | u_char *key = NULL((void*)0), *salt = NULL((void*)0), *dp; |
| 4063 | u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; |
| 4064 | |
| 4065 | if (decoded == NULL((void*)0) || decryptedp == NULL((void*)0) || pubkeyp == NULL((void*)0)) |
| 4066 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4067 | |
| 4068 | *decryptedp = NULL((void*)0); |
| 4069 | *pubkeyp = NULL((void*)0); |
| 4070 | |
| 4071 | if ((decrypted = sshbuf_new()) == NULL((void*)0)) { |
| 4072 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4073 | goto out; |
| 4074 | } |
| 4075 | |
| 4076 | /* parse public portion of key */ |
| 4077 | if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 || |
| 4078 | (r = sshbuf_get_cstring(decoded, &ciphername, NULL((void*)0))) != 0 || |
| 4079 | (r = sshbuf_get_cstring(decoded, &kdfname, NULL((void*)0))) != 0 || |
| 4080 | (r = sshbuf_froms(decoded, &kdf)) != 0 || |
| 4081 | (r = sshbuf_get_u32(decoded, &nkeys)) != 0) |
| 4082 | goto out; |
| 4083 | |
| 4084 | if (nkeys != 1) { |
| 4085 | /* XXX only one key supported at present */ |
| 4086 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4087 | goto out; |
| 4088 | } |
| 4089 | |
| 4090 | if ((r = sshkey_froms(decoded, &pubkey)) != 0 || |
| 4091 | (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) |
| 4092 | goto out; |
| 4093 | |
| 4094 | if ((cipher = cipher_by_name(ciphername)) == NULL((void*)0)) { |
| 4095 | r = SSH_ERR_KEY_UNKNOWN_CIPHER-42; |
| 4096 | goto out; |
| 4097 | } |
| 4098 | if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { |
| 4099 | r = SSH_ERR_KEY_UNKNOWN_CIPHER-42; |
| 4100 | goto out; |
| 4101 | } |
| 4102 | if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) { |
| 4103 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4104 | goto out; |
| 4105 | } |
| 4106 | if ((passphrase == NULL((void*)0) || strlen(passphrase) == 0) && |
| 4107 | strcmp(kdfname, "none") != 0) { |
| 4108 | /* passphrase required */ |
| 4109 | r = SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4110 | goto out; |
| 4111 | } |
| 4112 | |
| 4113 | /* check size of encrypted key blob */ |
| 4114 | blocksize = cipher_blocksize(cipher); |
| 4115 | if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { |
| 4116 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4117 | goto out; |
| 4118 | } |
| 4119 | |
| 4120 | /* setup key */ |
| 4121 | keylen = cipher_keylen(cipher); |
| 4122 | ivlen = cipher_ivlen(cipher); |
| 4123 | authlen = cipher_authlen(cipher); |
| 4124 | if ((key = calloc(1, keylen + ivlen)) == NULL((void*)0)) { |
| 4125 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4126 | goto out; |
| 4127 | } |
| 4128 | if (strcmp(kdfname, "bcrypt") == 0) { |
| 4129 | if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || |
| 4130 | (r = sshbuf_get_u32(kdf, &rounds)) != 0) |
| 4131 | goto out; |
| 4132 | if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, |
| 4133 | key, keylen + ivlen, rounds) < 0) { |
| 4134 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4135 | goto out; |
| 4136 | } |
| 4137 | } |
| 4138 | |
| 4139 | /* check that an appropriate amount of auth data is present */ |
| 4140 | if (sshbuf_len(decoded) < authlen || |
| 4141 | sshbuf_len(decoded) - authlen < encrypted_len) { |
| 4142 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4143 | goto out; |
| 4144 | } |
| 4145 | |
| 4146 | /* decrypt private portion of key */ |
| 4147 | if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || |
| 4148 | (r = cipher_init(&ciphercontext, cipher, key, keylen, |
| 4149 | key + keylen, ivlen, 0)) != 0) |
| 4150 | goto out; |
| 4151 | if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded), |
| 4152 | encrypted_len, 0, authlen)) != 0) { |
| 4153 | /* an integrity error here indicates an incorrect passphrase */ |
| 4154 | if (r == SSH_ERR_MAC_INVALID-30) |
| 4155 | r = SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4156 | goto out; |
| 4157 | } |
| 4158 | if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) |
| 4159 | goto out; |
| 4160 | /* there should be no trailing data */ |
| 4161 | if (sshbuf_len(decoded) != 0) { |
| 4162 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4163 | goto out; |
| 4164 | } |
| 4165 | |
| 4166 | /* check check bytes */ |
| 4167 | if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || |
| 4168 | (r = sshbuf_get_u32(decrypted, &check2)) != 0) |
| 4169 | goto out; |
| 4170 | if (check1 != check2) { |
| 4171 | r = SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4172 | goto out; |
| 4173 | } |
| 4174 | /* success */ |
| 4175 | *decryptedp = decrypted; |
| 4176 | decrypted = NULL((void*)0); |
| 4177 | *pubkeyp = pubkey; |
| 4178 | pubkey = NULL((void*)0); |
| 4179 | r = 0; |
| 4180 | out: |
| 4181 | cipher_free(ciphercontext); |
| 4182 | free(ciphername); |
| 4183 | free(kdfname); |
| 4184 | sshkey_free(pubkey); |
| 4185 | if (salt != NULL((void*)0)) { |
| 4186 | explicit_bzero(salt, slen); |
| 4187 | free(salt); |
| 4188 | } |
| 4189 | if (key != NULL((void*)0)) { |
| 4190 | explicit_bzero(key, keylen + ivlen); |
| 4191 | free(key); |
| 4192 | } |
| 4193 | sshbuf_free(kdf); |
| 4194 | sshbuf_free(decrypted); |
| 4195 | return r; |
| 4196 | } |
| 4197 | |
| 4198 | /* Check deterministic padding after private key */ |
| 4199 | static int |
| 4200 | private2_check_padding(struct sshbuf *decrypted) |
| 4201 | { |
| 4202 | u_char pad; |
| 4203 | size_t i; |
| 4204 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4205 | |
| 4206 | i = 0; |
| 4207 | while (sshbuf_len(decrypted)) { |
| 4208 | if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) |
| 4209 | goto out; |
| 4210 | if (pad != (++i & 0xff)) { |
| 4211 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4212 | goto out; |
| 4213 | } |
| 4214 | } |
| 4215 | /* success */ |
| 4216 | r = 0; |
| 4217 | out: |
| 4218 | explicit_bzero(&pad, sizeof(pad)); |
| 4219 | explicit_bzero(&i, sizeof(i)); |
| 4220 | return r; |
| 4221 | } |
| 4222 | |
| 4223 | static int |
| 4224 | sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, |
| 4225 | struct sshkey **keyp, char **commentp) |
| 4226 | { |
| 4227 | char *comment = NULL((void*)0); |
| 4228 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4229 | struct sshbuf *decoded = NULL((void*)0), *decrypted = NULL((void*)0); |
| 4230 | struct sshkey *k = NULL((void*)0), *pubkey = NULL((void*)0); |
| 4231 | |
| 4232 | if (keyp != NULL((void*)0)) |
| 4233 | *keyp = NULL((void*)0); |
| 4234 | if (commentp != NULL((void*)0)) |
| 4235 | *commentp = NULL((void*)0); |
| 4236 | |
| 4237 | /* Undo base64 encoding and decrypt the private section */ |
| 4238 | if ((r = private2_uudecode(blob, &decoded)) != 0 || |
| 4239 | (r = private2_decrypt(decoded, passphrase, |
| 4240 | &decrypted, &pubkey)) != 0) |
| 4241 | goto out; |
| 4242 | |
| 4243 | if (type != KEY_UNSPEC && |
| 4244 | sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) { |
| 4245 | r = SSH_ERR_KEY_TYPE_MISMATCH-13; |
| 4246 | goto out; |
| 4247 | } |
| 4248 | |
| 4249 | /* Load the private key and comment */ |
| 4250 | if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || |
| 4251 | (r = sshbuf_get_cstring(decrypted, &comment, NULL((void*)0))) != 0) |
| 4252 | goto out; |
| 4253 | |
| 4254 | /* Check deterministic padding after private section */ |
| 4255 | if ((r = private2_check_padding(decrypted)) != 0) |
| 4256 | goto out; |
| 4257 | |
| 4258 | /* Check that the public key in the envelope matches the private key */ |
| 4259 | if (!sshkey_equal(pubkey, k)) { |
| 4260 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4261 | goto out; |
| 4262 | } |
| 4263 | |
| 4264 | /* success */ |
| 4265 | r = 0; |
| 4266 | if (keyp != NULL((void*)0)) { |
| 4267 | *keyp = k; |
| 4268 | k = NULL((void*)0); |
| 4269 | } |
| 4270 | if (commentp != NULL((void*)0)) { |
| 4271 | *commentp = comment; |
| 4272 | comment = NULL((void*)0); |
| 4273 | } |
| 4274 | out: |
| 4275 | free(comment); |
| 4276 | sshbuf_free(decoded); |
| 4277 | sshbuf_free(decrypted); |
| 4278 | sshkey_free(k); |
| 4279 | sshkey_free(pubkey); |
| 4280 | return r; |
| 4281 | } |
| 4282 | |
| 4283 | static int |
| 4284 | sshkey_parse_private2_pubkey(struct sshbuf *blob, int type, |
| 4285 | struct sshkey **keyp) |
| 4286 | { |
| 4287 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4288 | struct sshbuf *decoded = NULL((void*)0); |
| 4289 | struct sshkey *pubkey = NULL((void*)0); |
| 4290 | u_int nkeys = 0; |
| 4291 | |
| 4292 | if (keyp != NULL((void*)0)) |
| 4293 | *keyp = NULL((void*)0); |
| 4294 | |
| 4295 | if ((r = private2_uudecode(blob, &decoded)) != 0) |
| 4296 | goto out; |
| 4297 | /* parse public key from unencrypted envelope */ |
| 4298 | if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 || |
| 4299 | (r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void*)0), ((void*)0))) != 0 || /* cipher */ |
| 4300 | (r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void*)0), ((void*)0))) != 0 || /* KDF alg */ |
| 4301 | (r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void*)0), ((void*)0))) != 0 || /* KDF hint */ |
| 4302 | (r = sshbuf_get_u32(decoded, &nkeys)) != 0) |
| 4303 | goto out; |
| 4304 | |
| 4305 | if (nkeys != 1) { |
| 4306 | /* XXX only one key supported at present */ |
| 4307 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4308 | goto out; |
| 4309 | } |
| 4310 | |
| 4311 | /* Parse the public key */ |
| 4312 | if ((r = sshkey_froms(decoded, &pubkey)) != 0) |
| 4313 | goto out; |
| 4314 | |
| 4315 | if (type != KEY_UNSPEC && |
| 4316 | sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) { |
| 4317 | r = SSH_ERR_KEY_TYPE_MISMATCH-13; |
| 4318 | goto out; |
| 4319 | } |
| 4320 | |
| 4321 | /* success */ |
| 4322 | r = 0; |
| 4323 | if (keyp != NULL((void*)0)) { |
| 4324 | *keyp = pubkey; |
| 4325 | pubkey = NULL((void*)0); |
| 4326 | } |
| 4327 | out: |
| 4328 | sshbuf_free(decoded); |
| 4329 | sshkey_free(pubkey); |
| 4330 | return r; |
| 4331 | } |
| 4332 | |
| 4333 | #ifdef WITH_OPENSSL1 |
| 4334 | /* convert SSH v2 key to PEM or PKCS#8 format */ |
| 4335 | static int |
| 4336 | sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf, |
| 4337 | int format, const char *_passphrase, const char *comment) |
| 4338 | { |
| 4339 | int was_shielded = sshkey_is_shielded(key); |
| 4340 | int success, r; |
| 4341 | int blen, len = strlen(_passphrase); |
| 4342 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL((void*)0); |
| 4343 | const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL((void*)0); |
| 4344 | char *bptr; |
| 4345 | BIO *bio = NULL((void*)0); |
| 4346 | struct sshbuf *blob; |
| 4347 | EVP_PKEY *pkey = NULL((void*)0); |
| 4348 | |
| 4349 | if (len > 0 && len <= 4) |
| 4350 | return SSH_ERR_PASSPHRASE_TOO_SHORT-40; |
| 4351 | if ((blob = sshbuf_new()) == NULL((void*)0)) |
| 4352 | return SSH_ERR_ALLOC_FAIL-2; |
| 4353 | if ((bio = BIO_new(BIO_s_mem())) == NULL((void*)0)) { |
| 4354 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4355 | goto out; |
| 4356 | } |
| 4357 | if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL((void*)0)) { |
| 4358 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4359 | goto out; |
| 4360 | } |
| 4361 | if ((r = sshkey_unshield_private(key)) != 0) |
| 4362 | goto out; |
| 4363 | |
| 4364 | switch (key->type) { |
| 4365 | case KEY_DSA: |
| 4366 | if (format == SSHKEY_PRIVATE_PEM) { |
| 4367 | success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, |
| 4368 | cipher, passphrase, len, NULL((void*)0), NULL((void*)0)); |
| 4369 | } else { |
| 4370 | success = EVP_PKEY_set1_DSA(pkey, key->dsa); |
| 4371 | } |
| 4372 | break; |
| 4373 | case KEY_ECDSA: |
| 4374 | if (format == SSHKEY_PRIVATE_PEM) { |
| 4375 | success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, |
| 4376 | cipher, passphrase, len, NULL((void*)0), NULL((void*)0)); |
| 4377 | } else { |
| 4378 | success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa); |
| 4379 | } |
| 4380 | break; |
| 4381 | case KEY_RSA: |
| 4382 | if (format == SSHKEY_PRIVATE_PEM) { |
| 4383 | success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, |
| 4384 | cipher, passphrase, len, NULL((void*)0), NULL((void*)0)); |
| 4385 | } else { |
| 4386 | success = EVP_PKEY_set1_RSA(pkey, key->rsa); |
| 4387 | } |
| 4388 | break; |
| 4389 | default: |
| 4390 | success = 0; |
| 4391 | break; |
| 4392 | } |
| 4393 | if (success == 0) { |
| 4394 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 4395 | goto out; |
| 4396 | } |
| 4397 | if (format == SSHKEY_PRIVATE_PKCS8) { |
| 4398 | if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher, |
| 4399 | passphrase, len, NULL((void*)0), NULL((void*)0))) == 0) { |
| 4400 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 4401 | goto out; |
| 4402 | } |
| 4403 | } |
| 4404 | if ((blen = BIO_get_mem_data(bio, &bptr)BIO_ctrl(bio,3,0,(char *)&bptr)) <= 0) { |
| 4405 | r = SSH_ERR_INTERNAL_ERROR-1; |
| 4406 | goto out; |
| 4407 | } |
| 4408 | if ((r = sshbuf_put(blob, bptr, blen)) != 0) |
| 4409 | goto out; |
| 4410 | r = 0; |
| 4411 | out: |
| 4412 | if (was_shielded) |
| 4413 | r = sshkey_shield_private(key); |
| 4414 | if (r == 0) |
| 4415 | r = sshbuf_putb(buf, blob); |
| 4416 | |
| 4417 | EVP_PKEY_free(pkey); |
| 4418 | sshbuf_free(blob); |
| 4419 | BIO_free(bio); |
| 4420 | return r; |
| 4421 | } |
| 4422 | #endif /* WITH_OPENSSL */ |
| 4423 | |
| 4424 | /* Serialise "key" to buffer "blob" */ |
| 4425 | int |
| 4426 | sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, |
| 4427 | const char *passphrase, const char *comment, |
| 4428 | int format, const char *openssh_format_cipher, int openssh_format_rounds) |
| 4429 | { |
| 4430 | switch (key->type) { |
| 4431 | #ifdef WITH_OPENSSL1 |
| 4432 | case KEY_DSA: |
| 4433 | case KEY_ECDSA: |
| 4434 | case KEY_RSA: |
| 4435 | break; /* see below */ |
| 4436 | #endif /* WITH_OPENSSL */ |
| 4437 | case KEY_ED25519: |
| 4438 | case KEY_ED25519_SK: |
| 4439 | #ifdef WITH_XMSS |
| 4440 | case KEY_XMSS: |
| 4441 | #endif /* WITH_XMSS */ |
| 4442 | #ifdef WITH_OPENSSL1 |
| 4443 | case KEY_ECDSA_SK: |
| 4444 | #endif /* WITH_OPENSSL */ |
| 4445 | return sshkey_private_to_blob2(key, blob, passphrase, |
| 4446 | comment, openssh_format_cipher, openssh_format_rounds); |
| 4447 | default: |
| 4448 | return SSH_ERR_KEY_TYPE_UNKNOWN-14; |
| 4449 | } |
| 4450 | |
| 4451 | #ifdef WITH_OPENSSL1 |
| 4452 | switch (format) { |
| 4453 | case SSHKEY_PRIVATE_OPENSSH: |
| 4454 | return sshkey_private_to_blob2(key, blob, passphrase, |
| 4455 | comment, openssh_format_cipher, openssh_format_rounds); |
| 4456 | case SSHKEY_PRIVATE_PEM: |
| 4457 | case SSHKEY_PRIVATE_PKCS8: |
| 4458 | return sshkey_private_to_blob_pem_pkcs8(key, blob, |
| 4459 | format, passphrase, comment); |
| 4460 | default: |
| 4461 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4462 | } |
| 4463 | #endif /* WITH_OPENSSL */ |
| 4464 | } |
| 4465 | |
| 4466 | #ifdef WITH_OPENSSL1 |
| 4467 | static int |
| 4468 | translate_libcrypto_error(unsigned long pem_err) |
| 4469 | { |
| 4470 | int pem_reason = ERR_GET_REASON(pem_err)(int)((pem_err)&0xfffL); |
| 4471 | |
| 4472 | switch (ERR_GET_LIB(pem_err)(int)((((unsigned long)pem_err)>>24L)&0xffL)) { |
| 4473 | case ERR_LIB_PEM9: |
| 4474 | switch (pem_reason) { |
| 4475 | case PEM_R_BAD_PASSWORD_READ104: |
| 4476 | case PEM_R_PROBLEMS_GETTING_PASSWORD109: |
| 4477 | case PEM_R_BAD_DECRYPT101: |
| 4478 | return SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4479 | default: |
| 4480 | return SSH_ERR_INVALID_FORMAT-4; |
| 4481 | } |
| 4482 | case ERR_LIB_EVP6: |
| 4483 | switch (pem_reason) { |
| 4484 | case EVP_R_BAD_DECRYPT100: |
| 4485 | return SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4486 | #ifdef EVP_R_BN_DECODE_ERROR112 |
| 4487 | case EVP_R_BN_DECODE_ERROR112: |
| 4488 | #endif |
| 4489 | case EVP_R_DECODE_ERROR114: |
| 4490 | #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR145 |
| 4491 | case EVP_R_PRIVATE_KEY_DECODE_ERROR145: |
| 4492 | #endif |
| 4493 | return SSH_ERR_INVALID_FORMAT-4; |
| 4494 | default: |
| 4495 | return SSH_ERR_LIBCRYPTO_ERROR-22; |
| 4496 | } |
| 4497 | case ERR_LIB_ASN113: |
| 4498 | return SSH_ERR_INVALID_FORMAT-4; |
| 4499 | } |
| 4500 | return SSH_ERR_LIBCRYPTO_ERROR-22; |
| 4501 | } |
| 4502 | |
| 4503 | static void |
| 4504 | clear_libcrypto_errors(void) |
| 4505 | { |
| 4506 | while (ERR_get_error() != 0) |
| 4507 | ; |
| 4508 | } |
| 4509 | |
| 4510 | /* |
| 4511 | * Translate OpenSSL error codes to determine whether |
| 4512 | * passphrase is required/incorrect. |
| 4513 | */ |
| 4514 | static int |
| 4515 | convert_libcrypto_error(void) |
| 4516 | { |
| 4517 | /* |
| 4518 | * Some password errors are reported at the beginning |
| 4519 | * of the error queue. |
| 4520 | */ |
| 4521 | if (translate_libcrypto_error(ERR_peek_error()) == |
| 4522 | SSH_ERR_KEY_WRONG_PASSPHRASE-43) |
| 4523 | return SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4524 | return translate_libcrypto_error(ERR_peek_last_error()); |
| 4525 | } |
| 4526 | |
| 4527 | static int |
| 4528 | sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, |
| 4529 | const char *passphrase, struct sshkey **keyp) |
| 4530 | { |
| 4531 | EVP_PKEY *pk = NULL((void*)0); |
| 4532 | struct sshkey *prv = NULL((void*)0); |
| 4533 | BIO *bio = NULL((void*)0); |
| 4534 | int r; |
| 4535 | |
| 4536 | if (keyp != NULL((void*)0)) |
| 4537 | *keyp = NULL((void*)0); |
| 4538 | |
| 4539 | if ((bio = BIO_new(BIO_s_mem())) == NULL((void*)0) || sshbuf_len(blob) > INT_MAX2147483647) |
| 4540 | return SSH_ERR_ALLOC_FAIL-2; |
| 4541 | if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != |
| 4542 | (int)sshbuf_len(blob)) { |
| 4543 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4544 | goto out; |
| 4545 | } |
| 4546 | |
| 4547 | clear_libcrypto_errors(); |
| 4548 | if ((pk = PEM_read_bio_PrivateKey(bio, NULL((void*)0), NULL((void*)0), |
| 4549 | (char *)passphrase)) == NULL((void*)0)) { |
| 4550 | /* |
| 4551 | * libcrypto may return various ASN.1 errors when attempting |
| 4552 | * to parse a key with an incorrect passphrase. |
| 4553 | * Treat all format errors as "incorrect passphrase" if a |
| 4554 | * passphrase was supplied. |
| 4555 | */ |
| 4556 | if (passphrase != NULL((void*)0) && *passphrase != '\0') |
| 4557 | r = SSH_ERR_KEY_WRONG_PASSPHRASE-43; |
| 4558 | else |
| 4559 | r = convert_libcrypto_error(); |
| 4560 | goto out; |
| 4561 | } |
| 4562 | if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA6 && |
| 4563 | (type == KEY_UNSPEC || type == KEY_RSA)) { |
| 4564 | if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void*)0)) { |
| 4565 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4566 | goto out; |
| 4567 | } |
| 4568 | prv->rsa = EVP_PKEY_get1_RSA(pk); |
| 4569 | prv->type = KEY_RSA; |
| 4570 | #ifdef DEBUG_PK |
| 4571 | RSA_print_fp(stderr(&__sF[2]), prv->rsa, 8); |
| 4572 | #endif |
| 4573 | if (RSA_blinding_on(prv->rsa, NULL((void*)0)) != 1) { |
| 4574 | r = SSH_ERR_LIBCRYPTO_ERROR-22; |
| 4575 | goto out; |
| 4576 | } |
| 4577 | if ((r = check_rsa_length(prv->rsa)) != 0) |
| 4578 | goto out; |
| 4579 | } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA116 && |
| 4580 | (type == KEY_UNSPEC || type == KEY_DSA)) { |
| 4581 | if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void*)0)) { |
| 4582 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4583 | goto out; |
| 4584 | } |
| 4585 | prv->dsa = EVP_PKEY_get1_DSA(pk); |
| 4586 | prv->type = KEY_DSA; |
| 4587 | #ifdef DEBUG_PK |
| 4588 | DSA_print_fp(stderr(&__sF[2]), prv->dsa, 8); |
| 4589 | #endif |
| 4590 | } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC408 && |
| 4591 | (type == KEY_UNSPEC || type == KEY_ECDSA)) { |
| 4592 | if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void*)0)) { |
| 4593 | r = SSH_ERR_ALLOC_FAIL-2; |
| 4594 | goto out; |
| 4595 | } |
| 4596 | prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); |
| 4597 | prv->type = KEY_ECDSA; |
| 4598 | prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); |
| 4599 | if (prv->ecdsa_nid == -1 || |
| 4600 | sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL((void*)0) || |
| 4601 | sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), |
| 4602 | EC_KEY_get0_public_key(prv->ecdsa)) != 0 || |
| 4603 | sshkey_ec_validate_private(prv->ecdsa) != 0) { |
| 4604 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4605 | goto out; |
| 4606 | } |
| 4607 | #ifdef DEBUG_PK |
| 4608 | if (prv != NULL((void*)0) && prv->ecdsa != NULL((void*)0)) |
| 4609 | sshkey_dump_ec_key(prv->ecdsa); |
| 4610 | #endif |
| 4611 | } else { |
| 4612 | r = SSH_ERR_INVALID_FORMAT-4; |
| 4613 | goto out; |
| 4614 | } |
| 4615 | r = 0; |
| 4616 | if (keyp != NULL((void*)0)) { |
| 4617 | *keyp = prv; |
| 4618 | prv = NULL((void*)0); |
| 4619 | } |
| 4620 | out: |
| 4621 | BIO_free(bio); |
| 4622 | EVP_PKEY_free(pk); |
| 4623 | sshkey_free(prv); |
| 4624 | return r; |
| 4625 | } |
| 4626 | #endif /* WITH_OPENSSL */ |
| 4627 | |
| 4628 | int |
| 4629 | sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, |
| 4630 | const char *passphrase, struct sshkey **keyp, char **commentp) |
| 4631 | { |
| 4632 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4633 | |
| 4634 | if (keyp != NULL((void*)0)) |
| 4635 | *keyp = NULL((void*)0); |
| 4636 | if (commentp != NULL((void*)0)) |
| 4637 | *commentp = NULL((void*)0); |
| 4638 | |
| 4639 | switch (type) { |
| 4640 | case KEY_ED25519: |
| 4641 | case KEY_XMSS: |
| 4642 | /* No fallback for new-format-only keys */ |
| 4643 | return sshkey_parse_private2(blob, type, passphrase, |
| 4644 | keyp, commentp); |
| 4645 | default: |
| 4646 | r = sshkey_parse_private2(blob, type, passphrase, keyp, |
| 4647 | commentp); |
| 4648 | /* Only fallback to PEM parser if a format error occurred. */ |
| 4649 | if (r != SSH_ERR_INVALID_FORMAT-4) |
| 4650 | return r; |
| 4651 | #ifdef WITH_OPENSSL1 |
| 4652 | return sshkey_parse_private_pem_fileblob(blob, type, |
| 4653 | passphrase, keyp); |
| 4654 | #else |
| 4655 | return SSH_ERR_INVALID_FORMAT-4; |
| 4656 | #endif /* WITH_OPENSSL */ |
| 4657 | } |
| 4658 | } |
| 4659 | |
| 4660 | int |
| 4661 | sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, |
| 4662 | struct sshkey **keyp, char **commentp) |
| 4663 | { |
| 4664 | if (keyp != NULL((void*)0)) |
| 4665 | *keyp = NULL((void*)0); |
| 4666 | if (commentp != NULL((void*)0)) |
| 4667 | *commentp = NULL((void*)0); |
| 4668 | |
| 4669 | return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, |
| 4670 | passphrase, keyp, commentp); |
| 4671 | } |
| 4672 | |
| 4673 | void |
| 4674 | sshkey_sig_details_free(struct sshkey_sig_details *details) |
| 4675 | { |
| 4676 | freezero(details, sizeof(*details)); |
| 4677 | } |
| 4678 | |
| 4679 | int |
| 4680 | sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type, |
| 4681 | struct sshkey **pubkeyp) |
| 4682 | { |
| 4683 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 4684 | |
| 4685 | if (pubkeyp != NULL((void*)0)) |
| 4686 | *pubkeyp = NULL((void*)0); |
| 4687 | /* only new-format private keys bundle a public key inside */ |
| 4688 | if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0) |
| 4689 | return r; |
| 4690 | return 0; |
| 4691 | } |
| 4692 | |
| 4693 | #ifdef WITH_XMSS |
| 4694 | /* |
| 4695 | * serialize the key with the current state and forward the state |
| 4696 | * maxsign times. |
| 4697 | */ |
| 4698 | int |
| 4699 | sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, |
| 4700 | u_int32_t maxsign, int printerror) |
| 4701 | { |
| 4702 | int r, rupdate; |
| 4703 | |
| 4704 | if (maxsign == 0 || |
| 4705 | sshkey_type_plain(k->type) != KEY_XMSS) |
| 4706 | return sshkey_private_serialize_opt(k, b, |
| 4707 | SSHKEY_SERIALIZE_DEFAULT); |
| 4708 | if ((r = sshkey_xmss_get_state(k, printerror)) != 0 || |
| 4709 | (r = sshkey_private_serialize_opt(k, b, |
| 4710 | SSHKEY_SERIALIZE_STATE)) != 0 || |
| 4711 | (r = sshkey_xmss_forward_state(k, maxsign)) != 0) |
| 4712 | goto out; |
| 4713 | r = 0; |
| 4714 | out: |
| 4715 | if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) { |
| 4716 | if (r == 0) |
| 4717 | r = rupdate; |
| 4718 | } |
| 4719 | return r; |
| 4720 | } |
| 4721 | |
| 4722 | u_int32_t |
| 4723 | sshkey_signatures_left(const struct sshkey *k) |
| 4724 | { |
| 4725 | if (sshkey_type_plain(k->type) == KEY_XMSS) |
| 4726 | return sshkey_xmss_signatures_left(k); |
| 4727 | return 0; |
| 4728 | } |
| 4729 | |
| 4730 | int |
| 4731 | sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) |
| 4732 | { |
| 4733 | if (sshkey_type_plain(k->type) != KEY_XMSS) |
| 4734 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4735 | return sshkey_xmss_enable_maxsign(k, maxsign); |
| 4736 | } |
| 4737 | |
| 4738 | int |
| 4739 | sshkey_set_filename(struct sshkey *k, const char *filename) |
| 4740 | { |
| 4741 | if (k == NULL((void*)0)) |
| 4742 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4743 | if (sshkey_type_plain(k->type) != KEY_XMSS) |
| 4744 | return 0; |
| 4745 | if (filename == NULL((void*)0)) |
| 4746 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4747 | if ((k->xmss_filename = strdup(filename)) == NULL((void*)0)) |
| 4748 | return SSH_ERR_ALLOC_FAIL-2; |
| 4749 | return 0; |
| 4750 | } |
| 4751 | #else |
| 4752 | int |
| 4753 | sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, |
| 4754 | u_int32_t maxsign, int printerror) |
| 4755 | { |
| 4756 | return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT); |
| 4757 | } |
| 4758 | |
| 4759 | u_int32_t |
| 4760 | sshkey_signatures_left(const struct sshkey *k) |
| 4761 | { |
| 4762 | return 0; |
| 4763 | } |
| 4764 | |
| 4765 | int |
| 4766 | sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) |
| 4767 | { |
| 4768 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4769 | } |
| 4770 | |
| 4771 | int |
| 4772 | sshkey_set_filename(struct sshkey *k, const char *filename) |
| 4773 | { |
| 4774 | if (k == NULL((void*)0)) |
| 4775 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 4776 | return 0; |
| 4777 | } |
| 4778 | #endif /* WITH_XMSS */ |