| File: | src/usr.bin/ssh/ssh-agent/../ssh-agent.c |
| Warning: | line 1991, column 2 The return value from the call to 'setgid' is not checked. If an error occurs in 'setgid', the following code may execute with unexpected privileges |
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| 1 | /* $OpenBSD: ssh-agent.c,v 1.286 2022/01/12 03:30:32 dtucker Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * The authentication agent program. |
| 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
| 13 | * |
| 14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include <sys/types.h> |
| 38 | #include <sys/time.h> |
| 39 | #include <sys/queue.h> |
| 40 | #include <sys/resource.h> |
| 41 | #include <sys/socket.h> |
| 42 | #include <sys/stat.h> |
| 43 | #include <sys/un.h> |
| 44 | #include <sys/wait.h> |
| 45 | |
| 46 | #ifdef WITH_OPENSSL1 |
| 47 | #include <openssl/evp.h> |
| 48 | #endif |
| 49 | |
| 50 | #include <errno(*__errno()).h> |
| 51 | #include <fcntl.h> |
| 52 | #include <paths.h> |
| 53 | #include <poll.h> |
| 54 | #include <signal.h> |
| 55 | #include <stdlib.h> |
| 56 | #include <stdio.h> |
| 57 | #include <string.h> |
| 58 | #include <stdarg.h> |
| 59 | #include <limits.h> |
| 60 | #include <time.h> |
| 61 | #include <unistd.h> |
| 62 | #include <util.h> |
| 63 | |
| 64 | #include "xmalloc.h" |
| 65 | #include "ssh.h" |
| 66 | #include "ssh2.h" |
| 67 | #include "sshbuf.h" |
| 68 | #include "sshkey.h" |
| 69 | #include "authfd.h" |
| 70 | #include "compat.h" |
| 71 | #include "log.h" |
| 72 | #include "misc.h" |
| 73 | #include "digest.h" |
| 74 | #include "ssherr.h" |
| 75 | #include "match.h" |
| 76 | #include "msg.h" |
| 77 | #include "ssherr.h" |
| 78 | #include "pathnames.h" |
| 79 | #include "ssh-pkcs11.h" |
| 80 | #include "sk-api.h" |
| 81 | #include "myproposal.h" |
| 82 | |
| 83 | #ifndef DEFAULT_ALLOWED_PROVIDERS"/usr/lib*/*,/usr/local/lib*/*" |
| 84 | # define DEFAULT_ALLOWED_PROVIDERS"/usr/lib*/*,/usr/local/lib*/*" "/usr/lib*/*,/usr/local/lib*/*" |
| 85 | #endif |
| 86 | |
| 87 | /* Maximum accepted message length */ |
| 88 | #define AGENT_MAX_LEN(256*1024) (256*1024) |
| 89 | /* Maximum bytes to read from client socket */ |
| 90 | #define AGENT_RBUF_LEN(4096) (4096) |
| 91 | /* Maximum number of recorded session IDs/hostkeys per connection */ |
| 92 | #define AGENT_MAX_SESSION_IDS16 16 |
| 93 | /* Maximum size of session ID */ |
| 94 | #define AGENT_MAX_SID_LEN128 128 |
| 95 | /* Maximum number of destination constraints to accept on a key */ |
| 96 | #define AGENT_MAX_DEST_CONSTRAINTS1024 1024 |
| 97 | |
| 98 | /* XXX store hostkey_sid in a refcounted tree */ |
| 99 | |
| 100 | typedef enum { |
| 101 | AUTH_UNUSED = 0, |
| 102 | AUTH_SOCKET = 1, |
| 103 | AUTH_CONNECTION = 2, |
| 104 | } sock_type; |
| 105 | |
| 106 | struct hostkey_sid { |
| 107 | struct sshkey *key; |
| 108 | struct sshbuf *sid; |
| 109 | int forwarded; |
| 110 | }; |
| 111 | |
| 112 | typedef struct socket_entry { |
| 113 | int fd; |
| 114 | sock_type type; |
| 115 | struct sshbuf *input; |
| 116 | struct sshbuf *output; |
| 117 | struct sshbuf *request; |
| 118 | size_t nsession_ids; |
| 119 | struct hostkey_sid *session_ids; |
| 120 | } SocketEntry; |
| 121 | |
| 122 | u_int sockets_alloc = 0; |
| 123 | SocketEntry *sockets = NULL((void*)0); |
| 124 | |
| 125 | typedef struct identity { |
| 126 | TAILQ_ENTRY(identity)struct { struct identity *tqe_next; struct identity **tqe_prev ; } next; |
| 127 | struct sshkey *key; |
| 128 | char *comment; |
| 129 | char *provider; |
| 130 | time_t death; |
| 131 | u_int confirm; |
| 132 | char *sk_provider; |
| 133 | struct dest_constraint *dest_constraints; |
| 134 | size_t ndest_constraints; |
| 135 | } Identity; |
| 136 | |
| 137 | struct idtable { |
| 138 | int nentries; |
| 139 | TAILQ_HEAD(idqueue, identity)struct idqueue { struct identity *tqh_first; struct identity * *tqh_last; } idlist; |
| 140 | }; |
| 141 | |
| 142 | /* private key table */ |
| 143 | struct idtable *idtab; |
| 144 | |
| 145 | int max_fd = 0; |
| 146 | |
| 147 | /* pid of shell == parent of agent */ |
| 148 | pid_t parent_pid = -1; |
| 149 | time_t parent_alive_interval = 0; |
| 150 | |
| 151 | /* pid of process for which cleanup_socket is applicable */ |
| 152 | pid_t cleanup_pid = 0; |
| 153 | |
| 154 | /* pathname and directory for AUTH_SOCKET */ |
| 155 | char socket_name[PATH_MAX1024]; |
| 156 | char socket_dir[PATH_MAX1024]; |
| 157 | |
| 158 | /* Pattern-list of allowed PKCS#11/Security key paths */ |
| 159 | static char *allowed_providers; |
| 160 | |
| 161 | /* locking */ |
| 162 | #define LOCK_SIZE32 32 |
| 163 | #define LOCK_SALT_SIZE16 16 |
| 164 | #define LOCK_ROUNDS1 1 |
| 165 | int locked = 0; |
| 166 | u_char lock_pwhash[LOCK_SIZE32]; |
| 167 | u_char lock_salt[LOCK_SALT_SIZE16]; |
| 168 | |
| 169 | extern char *__progname; |
| 170 | |
| 171 | /* Default lifetime in seconds (0 == forever) */ |
| 172 | static int lifetime = 0; |
| 173 | |
| 174 | static int fingerprint_hash = SSH_FP_HASH_DEFAULT2; |
| 175 | |
| 176 | /* Refuse signing of non-SSH messages for web-origin FIDO keys */ |
| 177 | static int restrict_websafe = 1; |
| 178 | |
| 179 | static void |
| 180 | close_socket(SocketEntry *e) |
| 181 | { |
| 182 | size_t i; |
| 183 | |
| 184 | close(e->fd); |
| 185 | sshbuf_free(e->input); |
| 186 | sshbuf_free(e->output); |
| 187 | sshbuf_free(e->request); |
| 188 | for (i = 0; i < e->nsession_ids; i++) { |
| 189 | sshkey_free(e->session_ids[i].key); |
| 190 | sshbuf_free(e->session_ids[i].sid); |
| 191 | } |
| 192 | free(e->session_ids); |
| 193 | memset(e, '\0', sizeof(*e)); |
| 194 | e->fd = -1; |
| 195 | e->type = AUTH_UNUSED; |
| 196 | } |
| 197 | |
| 198 | static void |
| 199 | idtab_init(void) |
| 200 | { |
| 201 | idtab = xcalloc(1, sizeof(*idtab)); |
| 202 | TAILQ_INIT(&idtab->idlist)do { (&idtab->idlist)->tqh_first = ((void*)0); (& idtab->idlist)->tqh_last = &(&idtab->idlist) ->tqh_first; } while (0); |
| 203 | idtab->nentries = 0; |
| 204 | } |
| 205 | |
| 206 | static void |
| 207 | free_dest_constraint_hop(struct dest_constraint_hop *dch) |
| 208 | { |
| 209 | u_int i; |
| 210 | |
| 211 | if (dch == NULL((void*)0)) |
| 212 | return; |
| 213 | free(dch->user); |
| 214 | free(dch->hostname); |
| 215 | for (i = 0; i < dch->nkeys; i++) |
| 216 | sshkey_free(dch->keys[i]); |
| 217 | free(dch->keys); |
| 218 | free(dch->key_is_ca); |
| 219 | } |
| 220 | |
| 221 | static void |
| 222 | free_dest_constraints(struct dest_constraint *dcs, size_t ndcs) |
| 223 | { |
| 224 | size_t i; |
| 225 | |
| 226 | for (i = 0; i < ndcs; i++) { |
| 227 | free_dest_constraint_hop(&dcs[i].from); |
| 228 | free_dest_constraint_hop(&dcs[i].to); |
| 229 | } |
| 230 | free(dcs); |
| 231 | } |
| 232 | |
| 233 | static void |
| 234 | free_identity(Identity *id) |
| 235 | { |
| 236 | sshkey_free(id->key); |
| 237 | free(id->provider); |
| 238 | free(id->comment); |
| 239 | free(id->sk_provider); |
| 240 | free_dest_constraints(id->dest_constraints, id->ndest_constraints); |
| 241 | free(id); |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Match 'key' against the key/CA list in a destination constraint hop |
| 246 | * Returns 0 on success or -1 otherwise. |
| 247 | */ |
| 248 | static int |
| 249 | match_key_hop(const char *tag, const struct sshkey *key, |
| 250 | const struct dest_constraint_hop *dch) |
| 251 | { |
| 252 | const char *reason = NULL((void*)0); |
| 253 | const char *hostname = dch->hostname ? dch->hostname : "(ORIGIN)"; |
| 254 | u_int i; |
| 255 | char *fp; |
| 256 | |
| 257 | if (key == NULL((void*)0)) |
| 258 | return -1; |
| 259 | /* XXX logspam */ |
| 260 | if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT2, |
| 261 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 262 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 262, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 263 | debug3_f("%s: entering hostname %s, requested key %s %s, %u keys avail",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 264, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s: entering hostname %s, requested key %s %s, %u keys avail" , tag, hostname, sshkey_type(key), fp, dch->nkeys) |
| 264 | tag, hostname, sshkey_type(key), fp, dch->nkeys)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 264, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s: entering hostname %s, requested key %s %s, %u keys avail" , tag, hostname, sshkey_type(key), fp, dch->nkeys); |
| 265 | free(fp); |
| 266 | for (i = 0; i < dch->nkeys; i++) { |
| 267 | if (dch->keys[i] == NULL((void*)0)) |
| 268 | return -1; |
| 269 | /* XXX logspam */ |
| 270 | if ((fp = sshkey_fingerprint(dch->keys[i], SSH_FP_HASH_DEFAULT2, |
| 271 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 272 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 272, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 273 | debug3_f("%s: key %u: %s%s %s", tag, i,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 275, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s: key %u: %s%s %s" , tag, i, dch->key_is_ca[i] ? "CA " : "", sshkey_type(dch-> keys[i]), fp) |
| 274 | dch->key_is_ca[i] ? "CA " : "",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 275, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s: key %u: %s%s %s" , tag, i, dch->key_is_ca[i] ? "CA " : "", sshkey_type(dch-> keys[i]), fp) |
| 275 | sshkey_type(dch->keys[i]), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 275, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s: key %u: %s%s %s" , tag, i, dch->key_is_ca[i] ? "CA " : "", sshkey_type(dch-> keys[i]), fp); |
| 276 | free(fp); |
| 277 | if (!sshkey_is_cert(key)) { |
| 278 | /* plain key */ |
| 279 | if (dch->key_is_ca[i] || |
| 280 | !sshkey_equal(key, dch->keys[i])) |
| 281 | continue; |
| 282 | return 0; |
| 283 | } |
| 284 | /* certificate */ |
| 285 | if (!dch->key_is_ca[i]) |
| 286 | continue; |
| 287 | if (key->cert == NULL((void*)0) || key->cert->signature_key == NULL((void*)0)) |
| 288 | return -1; /* shouldn't happen */ |
| 289 | if (!sshkey_equal(key->cert->signature_key, dch->keys[i])) |
| 290 | continue; |
| 291 | if (sshkey_cert_check_host(key, hostname, 1, |
| 292 | SSH_ALLOWED_CA_SIGALGS"ssh-ed25519," "ecdsa-sha2-nistp256," "ecdsa-sha2-nistp384," "ecdsa-sha2-nistp521," "sk-ssh-ed25519@openssh.com," "sk-ecdsa-sha2-nistp256@openssh.com," "rsa-sha2-512," "rsa-sha2-256", &reason) != 0) { |
| 293 | debug_f("cert %s / hostname %s rejected: %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 294, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "cert %s / hostname %s rejected: %s" , key->cert->key_id, hostname, reason) |
| 294 | key->cert->key_id, hostname, reason)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 294, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "cert %s / hostname %s rejected: %s" , key->cert->key_id, hostname, reason); |
| 295 | continue; |
| 296 | } |
| 297 | return 0; |
| 298 | } |
| 299 | return -1; |
| 300 | } |
| 301 | |
| 302 | /* Check destination constraints on an identity against the hostkey/user */ |
| 303 | static int |
| 304 | permitted_by_dest_constraints(const struct sshkey *fromkey, |
| 305 | const struct sshkey *tokey, Identity *id, const char *user, |
| 306 | const char **hostnamep) |
| 307 | { |
| 308 | size_t i; |
| 309 | struct dest_constraint *d; |
| 310 | |
| 311 | if (hostnamep != NULL((void*)0)) |
| 312 | *hostnamep = NULL((void*)0); |
| 313 | for (i = 0; i < id->ndest_constraints; i++) { |
| 314 | d = id->dest_constraints + i; |
| 315 | /* XXX remove logspam */ |
| 316 | debug2_f("constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 317 | i, d->from.user ? d->from.user : "",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 318 | d->from.user ? "@" : "",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 319 | d->from.hostname ? d->from.hostname : "(ORIGIN)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 320 | d->from.nkeys,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 321 | d->to.user ? d->to.user : "", d->to.user ? "@" : "",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys) |
| 322 | d->to.hostname ? d->to.hostname : "(ANY)", d->to.nkeys)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 322, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)" , i, d->from.user ? d->from.user : "", d->from.user ? "@" : "", d->from.hostname ? d->from.hostname : "(ORIGIN)" , d->from.nkeys, d->to.user ? d->to.user : "", d-> to.user ? "@" : "", d->to.hostname ? d->to.hostname : "(ANY)" , d->to.nkeys); |
| 323 | |
| 324 | /* Match 'from' key */ |
| 325 | if (fromkey == NULL((void*)0)) { |
| 326 | /* We are matching the first hop */ |
| 327 | if (d->from.hostname != NULL((void*)0) || d->from.nkeys != 0) |
| 328 | continue; |
| 329 | } else if (match_key_hop("from", fromkey, &d->from) != 0) |
| 330 | continue; |
| 331 | |
| 332 | /* Match 'to' key */ |
| 333 | if (tokey != NULL((void*)0) && match_key_hop("to", tokey, &d->to) != 0) |
| 334 | continue; |
| 335 | |
| 336 | /* Match user if specified */ |
| 337 | if (d->to.user != NULL((void*)0) && user != NULL((void*)0) && |
| 338 | !match_pattern(user, d->to.user)) |
| 339 | continue; |
| 340 | |
| 341 | /* successfully matched this constraint */ |
| 342 | if (hostnamep != NULL((void*)0)) |
| 343 | *hostnamep = d->to.hostname; |
| 344 | debug2_f("allowed for hostname %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 345, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "allowed for hostname %s" , d->to.hostname == ((void*)0) ? "*" : d->to.hostname) |
| 345 | d->to.hostname == NULL ? "*" : d->to.hostname)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 345, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "allowed for hostname %s" , d->to.hostname == ((void*)0) ? "*" : d->to.hostname); |
| 346 | return 0; |
| 347 | } |
| 348 | /* no match */ |
| 349 | debug2_f("%s identity \"%s\" not permitted for this destination",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 350, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "%s identity \"%s\" not permitted for this destination" , sshkey_type(id->key), id->comment) |
| 350 | sshkey_type(id->key), id->comment)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 350, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "%s identity \"%s\" not permitted for this destination" , sshkey_type(id->key), id->comment); |
| 351 | return -1; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Check whether hostkeys on a SocketEntry and the optionally specified user |
| 356 | * are permitted by the destination constraints on the Identity. |
| 357 | * Returns 0 on success or -1 otherwise. |
| 358 | */ |
| 359 | static int |
| 360 | identity_permitted(Identity *id, SocketEntry *e, char *user, |
| 361 | const char **forward_hostnamep, const char **last_hostnamep) |
| 362 | { |
| 363 | size_t i; |
| 364 | const char **hp; |
| 365 | struct hostkey_sid *hks; |
| 366 | const struct sshkey *fromkey = NULL((void*)0); |
| 367 | const char *test_user; |
| 368 | char *fp1, *fp2; |
| 369 | |
| 370 | /* XXX remove logspam */ |
| 371 | debug3_f("entering: key %s comment \"%s\", %zu socket bindings, "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 373, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering: key %s comment \"%s\", %zu socket bindings, " "%zu constraints", sshkey_type(id->key), id->comment, e ->nsession_ids, id->ndest_constraints) |
| 372 | "%zu constraints", sshkey_type(id->key), id->comment,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 373, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering: key %s comment \"%s\", %zu socket bindings, " "%zu constraints", sshkey_type(id->key), id->comment, e ->nsession_ids, id->ndest_constraints) |
| 373 | e->nsession_ids, id->ndest_constraints)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 373, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering: key %s comment \"%s\", %zu socket bindings, " "%zu constraints", sshkey_type(id->key), id->comment, e ->nsession_ids, id->ndest_constraints); |
| 374 | if (id->ndest_constraints == 0) |
| 375 | return 0; /* unconstrained */ |
| 376 | if (e->nsession_ids == 0) |
| 377 | return 0; /* local use */ |
| 378 | /* |
| 379 | * Walk through the hops recorded by session_id and try to find a |
| 380 | * constraint that satisfies each. |
| 381 | */ |
| 382 | for (i = 0; i < e->nsession_ids; i++) { |
| 383 | hks = e->session_ids + i; |
| 384 | if (hks->key == NULL((void*)0)) |
| 385 | fatal_f("internal error: no bound key")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 385, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "internal error: no bound key" ); |
| 386 | /* XXX remove logspam */ |
| 387 | fp1 = fp2 = NULL((void*)0); |
| 388 | if (fromkey != NULL((void*)0) && |
| 389 | (fp1 = sshkey_fingerprint(fromkey, SSH_FP_HASH_DEFAULT2, |
| 390 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 391 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 391, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 392 | if ((fp2 = sshkey_fingerprint(hks->key, SSH_FP_HASH_DEFAULT2, |
| 393 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 394 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 394, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 395 | debug3_f("socketentry fd=%d, entry %zu %s, "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2) |
| 396 | "from hostkey %s %s to user %s hostkey %s %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2) |
| 397 | e->fd, i, hks->forwarded ? "FORWARD" : "AUTH",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2) |
| 398 | fromkey ? sshkey_type(fromkey) : "(ORIGIN)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2) |
| 399 | fromkey ? fp1 : "", user ? user : "(ANY)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2) |
| 400 | sshkey_type(hks->key), fp2)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "socketentry fd=%d, entry %zu %s, " "from hostkey %s %s to user %s hostkey %s %s", e->fd, i, hks ->forwarded ? "FORWARD" : "AUTH", fromkey ? sshkey_type(fromkey ) : "(ORIGIN)", fromkey ? fp1 : "", user ? user : "(ANY)", sshkey_type (hks->key), fp2); |
| 401 | free(fp1); |
| 402 | free(fp2); |
| 403 | /* |
| 404 | * Record the hostnames for the initial forwarding and |
| 405 | * the final destination. |
| 406 | */ |
| 407 | hp = NULL((void*)0); |
| 408 | if (i == e->nsession_ids - 1) |
| 409 | hp = last_hostnamep; |
| 410 | else if (i == 0) |
| 411 | hp = forward_hostnamep; |
| 412 | /* Special handling for final recorded binding */ |
| 413 | test_user = NULL((void*)0); |
| 414 | if (i == e->nsession_ids - 1) { |
| 415 | /* Can only check user at final hop */ |
| 416 | test_user = user; |
| 417 | /* |
| 418 | * user is only presented for signature requests. |
| 419 | * If this is the case, make sure last binding is not |
| 420 | * for a forwarding. |
| 421 | */ |
| 422 | if (hks->forwarded && user != NULL((void*)0)) { |
| 423 | error_f("tried to sign on forwarding hop")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 423, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "tried to sign on forwarding hop" ); |
| 424 | return -1; |
| 425 | } |
| 426 | } else if (!hks->forwarded) { |
| 427 | error_f("tried to forward though signing bind")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 427, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "tried to forward though signing bind" ); |
| 428 | return -1; |
| 429 | } |
| 430 | if (permitted_by_dest_constraints(fromkey, hks->key, id, |
| 431 | test_user, hp) != 0) |
| 432 | return -1; |
| 433 | fromkey = hks->key; |
| 434 | } |
| 435 | /* |
| 436 | * Another special case: if the last bound session ID was for a |
| 437 | * forwarding, and this function is not being called to check a sign |
| 438 | * request (i.e. no 'user' supplied), then only permit the key if |
| 439 | * there is a permission that would allow it to be used at another |
| 440 | * destination. This hides keys that are allowed to be used to |
| 441 | * authenticate *to* a host but not permitted for *use* beyond it. |
| 442 | */ |
| 443 | hks = &e->session_ids[e->nsession_ids - 1]; |
| 444 | if (hks->forwarded && user == NULL((void*)0) && |
| 445 | permitted_by_dest_constraints(hks->key, NULL((void*)0), id, |
| 446 | NULL((void*)0), NULL((void*)0)) != 0) { |
| 447 | debug3_f("key permitted at host but not after")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 447, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "key permitted at host but not after" ); |
| 448 | return -1; |
| 449 | } |
| 450 | |
| 451 | /* success */ |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | /* return matching private key for given public key */ |
| 456 | static Identity * |
| 457 | lookup_identity(struct sshkey *key) |
| 458 | { |
| 459 | Identity *id; |
| 460 | |
| 461 | TAILQ_FOREACH(id, &idtab->idlist, next)for((id) = ((&idtab->idlist)->tqh_first); (id) != ( (void*)0); (id) = ((id)->next.tqe_next)) { |
| 462 | if (sshkey_equal(key, id->key)) |
| 463 | return (id); |
| 464 | } |
| 465 | return (NULL((void*)0)); |
| 466 | } |
| 467 | |
| 468 | /* Check confirmation of keysign request */ |
| 469 | static int |
| 470 | confirm_key(Identity *id, const char *extra) |
| 471 | { |
| 472 | char *p; |
| 473 | int ret = -1; |
| 474 | |
| 475 | p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT); |
| 476 | if (p != NULL((void*)0) && |
| 477 | ask_permission("Allow use of key %s?\nKey fingerprint %s.%s%s", |
| 478 | id->comment, p, |
| 479 | extra == NULL((void*)0) ? "" : "\n", extra == NULL((void*)0) ? "" : extra)) |
| 480 | ret = 0; |
| 481 | free(p); |
| 482 | |
| 483 | return (ret); |
| 484 | } |
| 485 | |
| 486 | static void |
| 487 | send_status(SocketEntry *e, int success) |
| 488 | { |
| 489 | int r; |
| 490 | |
| 491 | if ((r = sshbuf_put_u32(e->output, 1)) != 0 || |
| 492 | (r = sshbuf_put_u8(e->output, success ? |
| 493 | SSH_AGENT_SUCCESS6 : SSH_AGENT_FAILURE5)) != 0) |
| 494 | fatal_fr(r, "compose")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 494, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose"); |
| 495 | } |
| 496 | |
| 497 | /* send list of supported public keys to 'client' */ |
| 498 | static void |
| 499 | process_request_identities(SocketEntry *e) |
| 500 | { |
| 501 | Identity *id; |
| 502 | struct sshbuf *msg, *keys; |
| 503 | int r; |
| 504 | u_int nentries = 0; |
| 505 | |
| 506 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 506, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 507 | |
| 508 | if ((msg = sshbuf_new()) == NULL((void*)0) || (keys = sshbuf_new()) == NULL((void*)0)) |
| 509 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 509, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
| 510 | TAILQ_FOREACH(id, &idtab->idlist, next)for((id) = ((&idtab->idlist)->tqh_first); (id) != ( (void*)0); (id) = ((id)->next.tqe_next)) { |
| 511 | /* identity not visible, don't include in response */ |
| 512 | if (identity_permitted(id, e, NULL((void*)0), NULL((void*)0), NULL((void*)0)) != 0) |
| 513 | continue; |
| 514 | if ((r = sshkey_puts_opts(id->key, keys, |
| 515 | SSHKEY_SERIALIZE_INFO)) != 0 || |
| 516 | (r = sshbuf_put_cstring(keys, id->comment)) != 0) { |
| 517 | error_fr(r, "compose key/comment")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 517, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "compose key/comment" ); |
| 518 | continue; |
| 519 | } |
| 520 | nentries++; |
| 521 | } |
| 522 | debug2_f("replying with %u allowed of %u available keys",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 523, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "replying with %u allowed of %u available keys" , nentries, idtab->nentries) |
| 523 | nentries, idtab->nentries)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 523, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "replying with %u allowed of %u available keys" , nentries, idtab->nentries); |
| 524 | if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER12)) != 0 || |
| 525 | (r = sshbuf_put_u32(msg, nentries)) != 0 || |
| 526 | (r = sshbuf_putb(msg, keys)) != 0) |
| 527 | fatal_fr(r, "compose")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 527, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose"); |
| 528 | if ((r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 529 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 529, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 530 | sshbuf_free(msg); |
| 531 | sshbuf_free(keys); |
| 532 | } |
| 533 | |
| 534 | |
| 535 | static char * |
| 536 | agent_decode_alg(struct sshkey *key, u_int flags) |
| 537 | { |
| 538 | if (key->type == KEY_RSA) { |
| 539 | if (flags & SSH_AGENT_RSA_SHA2_2560x02) |
| 540 | return "rsa-sha2-256"; |
| 541 | else if (flags & SSH_AGENT_RSA_SHA2_5120x04) |
| 542 | return "rsa-sha2-512"; |
| 543 | } else if (key->type == KEY_RSA_CERT) { |
| 544 | if (flags & SSH_AGENT_RSA_SHA2_2560x02) |
| 545 | return "rsa-sha2-256-cert-v01@openssh.com"; |
| 546 | else if (flags & SSH_AGENT_RSA_SHA2_5120x04) |
| 547 | return "rsa-sha2-512-cert-v01@openssh.com"; |
| 548 | } |
| 549 | return NULL((void*)0); |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Attempt to parse the contents of a buffer as a SSH publickey userauth |
| 554 | * request, checking its contents for consistency and matching the embedded |
| 555 | * key against the one that is being used for signing. |
| 556 | * Note: does not modify msg buffer. |
| 557 | * Optionally extract the username, session ID and/or hostkey from the request. |
| 558 | */ |
| 559 | static int |
| 560 | parse_userauth_request(struct sshbuf *msg, const struct sshkey *expected_key, |
| 561 | char **userp, struct sshbuf **sess_idp, struct sshkey **hostkeyp) |
| 562 | { |
| 563 | struct sshbuf *b = NULL((void*)0), *sess_id = NULL((void*)0); |
| 564 | char *user = NULL((void*)0), *service = NULL((void*)0), *method = NULL((void*)0), *pkalg = NULL((void*)0); |
| 565 | int r; |
| 566 | u_char t, sig_follows; |
| 567 | struct sshkey *mkey = NULL((void*)0), *hostkey = NULL((void*)0); |
| 568 | |
| 569 | if (userp != NULL((void*)0)) |
| 570 | *userp = NULL((void*)0); |
| 571 | if (sess_idp != NULL((void*)0)) |
| 572 | *sess_idp = NULL((void*)0); |
| 573 | if (hostkeyp != NULL((void*)0)) |
| 574 | *hostkeyp = NULL((void*)0); |
| 575 | if ((b = sshbuf_fromb(msg)) == NULL((void*)0)) |
| 576 | fatal_f("sshbuf_fromb")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 576, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_fromb"); |
| 577 | |
| 578 | /* SSH userauth request */ |
| 579 | if ((r = sshbuf_froms(b, &sess_id)) != 0) |
| 580 | goto out; |
| 581 | if (sshbuf_len(sess_id) == 0) { |
| 582 | r = SSH_ERR_INVALID_FORMAT-4; |
| 583 | goto out; |
| 584 | } |
| 585 | if ((r = sshbuf_get_u8(b, &t)) != 0 || /* SSH2_MSG_USERAUTH_REQUEST */ |
| 586 | (r = sshbuf_get_cstring(b, &user, NULL((void*)0))) != 0 || /* server user */ |
| 587 | (r = sshbuf_get_cstring(b, &service, NULL((void*)0))) != 0 || /* service */ |
| 588 | (r = sshbuf_get_cstring(b, &method, NULL((void*)0))) != 0 || /* method */ |
| 589 | (r = sshbuf_get_u8(b, &sig_follows)) != 0 || /* sig-follows */ |
| 590 | (r = sshbuf_get_cstring(b, &pkalg, NULL((void*)0))) != 0 || /* alg */ |
| 591 | (r = sshkey_froms(b, &mkey)) != 0) /* key */ |
| 592 | goto out; |
| 593 | if (t != SSH2_MSG_USERAUTH_REQUEST50 || |
| 594 | sig_follows != 1 || |
| 595 | strcmp(service, "ssh-connection") != 0 || |
| 596 | !sshkey_equal(expected_key, mkey) || |
| 597 | sshkey_type_from_name(pkalg) != expected_key->type) { |
| 598 | r = SSH_ERR_INVALID_FORMAT-4; |
| 599 | goto out; |
| 600 | } |
| 601 | if (strcmp(method, "publickey-hostbound-v00@openssh.com") == 0) { |
| 602 | if ((r = sshkey_froms(b, &hostkey)) != 0) |
| 603 | goto out; |
| 604 | } else if (strcmp(method, "publickey") != 0) { |
| 605 | r = SSH_ERR_INVALID_FORMAT-4; |
| 606 | goto out; |
| 607 | } |
| 608 | if (sshbuf_len(b) != 0) { |
| 609 | r = SSH_ERR_INVALID_FORMAT-4; |
| 610 | goto out; |
| 611 | } |
| 612 | /* success */ |
| 613 | r = 0; |
| 614 | debug3_f("well formed userauth")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 614, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "well formed userauth" ); |
| 615 | if (userp != NULL((void*)0)) { |
| 616 | *userp = user; |
| 617 | user = NULL((void*)0); |
| 618 | } |
| 619 | if (sess_idp != NULL((void*)0)) { |
| 620 | *sess_idp = sess_id; |
| 621 | sess_id = NULL((void*)0); |
| 622 | } |
| 623 | if (hostkeyp != NULL((void*)0)) { |
| 624 | *hostkeyp = hostkey; |
| 625 | hostkey = NULL((void*)0); |
| 626 | } |
| 627 | out: |
| 628 | sshbuf_free(b); |
| 629 | sshbuf_free(sess_id); |
| 630 | free(user); |
| 631 | free(service); |
| 632 | free(method); |
| 633 | free(pkalg); |
| 634 | sshkey_free(mkey); |
| 635 | sshkey_free(hostkey); |
| 636 | return r; |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Attempt to parse the contents of a buffer as a SSHSIG signature request. |
| 641 | * Note: does not modify buffer. |
| 642 | */ |
| 643 | static int |
| 644 | parse_sshsig_request(struct sshbuf *msg) |
| 645 | { |
| 646 | int r; |
| 647 | struct sshbuf *b; |
| 648 | |
| 649 | if ((b = sshbuf_fromb(msg)) == NULL((void*)0)) |
| 650 | fatal_f("sshbuf_fromb")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 650, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_fromb"); |
| 651 | |
| 652 | if ((r = sshbuf_cmp(b, 0, "SSHSIG", 6)) != 0 || |
| 653 | (r = sshbuf_consume(b, 6)) != 0 || |
| 654 | (r = sshbuf_get_cstring(b, NULL((void*)0), NULL((void*)0))) != 0 || /* namespace */ |
| 655 | (r = sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0))) != 0 || /* reserved */ |
| 656 | (r = sshbuf_get_cstring(b, NULL((void*)0), NULL((void*)0))) != 0 || /* hashalg */ |
| 657 | (r = sshbuf_get_string_direct(b, NULL((void*)0), NULL((void*)0))) != 0) /* H(msg) */ |
| 658 | goto out; |
| 659 | if (sshbuf_len(b) != 0) { |
| 660 | r = SSH_ERR_INVALID_FORMAT-4; |
| 661 | goto out; |
| 662 | } |
| 663 | /* success */ |
| 664 | r = 0; |
| 665 | out: |
| 666 | sshbuf_free(b); |
| 667 | return r; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * This function inspects a message to be signed by a FIDO key that has a |
| 672 | * web-like application string (i.e. one that does not begin with "ssh:". |
| 673 | * It checks that the message is one of those expected for SSH operations |
| 674 | * (pubkey userauth, sshsig, CA key signing) to exclude signing challenges |
| 675 | * for the web. |
| 676 | */ |
| 677 | static int |
| 678 | check_websafe_message_contents(struct sshkey *key, struct sshbuf *data) |
| 679 | { |
| 680 | if (parse_userauth_request(data, key, NULL((void*)0), NULL((void*)0), NULL((void*)0)) == 0) { |
| 681 | debug_f("signed data matches public key userauth request")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 681, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "signed data matches public key userauth request" ); |
| 682 | return 1; |
| 683 | } |
| 684 | if (parse_sshsig_request(data) == 0) { |
| 685 | debug_f("signed data matches SSHSIG signature request")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 685, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "signed data matches SSHSIG signature request" ); |
| 686 | return 1; |
| 687 | } |
| 688 | |
| 689 | /* XXX check CA signature operation */ |
| 690 | |
| 691 | error("web-origin key attempting to sign non-SSH message")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 691, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "web-origin key attempting to sign non-SSH message" ); |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | static int |
| 696 | buf_equal(const struct sshbuf *a, const struct sshbuf *b) |
| 697 | { |
| 698 | if (sshbuf_ptr(a) == NULL((void*)0) || sshbuf_ptr(b) == NULL((void*)0)) |
| 699 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 700 | if (sshbuf_len(a) != sshbuf_len(b)) |
| 701 | return SSH_ERR_INVALID_FORMAT-4; |
| 702 | if (timingsafe_bcmp(sshbuf_ptr(a), sshbuf_ptr(b), sshbuf_len(a)) != 0) |
| 703 | return SSH_ERR_INVALID_FORMAT-4; |
| 704 | return 0; |
| 705 | } |
| 706 | |
| 707 | /* ssh2 only */ |
| 708 | static void |
| 709 | process_sign_request2(SocketEntry *e) |
| 710 | { |
| 711 | u_char *signature = NULL((void*)0); |
| 712 | size_t slen = 0; |
| 713 | u_int compat = 0, flags; |
| 714 | int r, ok = -1; |
| 715 | char *fp = NULL((void*)0), *user = NULL((void*)0), *sig_dest = NULL((void*)0); |
| 716 | const char *fwd_host = NULL((void*)0), *dest_host = NULL((void*)0); |
| 717 | struct sshbuf *msg = NULL((void*)0), *data = NULL((void*)0), *sid = NULL((void*)0); |
| 718 | struct sshkey *key = NULL((void*)0), *hostkey = NULL((void*)0); |
| 719 | struct identity *id; |
| 720 | struct notifier_ctx *notifier = NULL((void*)0); |
| 721 | |
| 722 | debug_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 722, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "entering"); |
| 723 | |
| 724 | if ((msg = sshbuf_new()) == NULL((void*)0) || (data = sshbuf_new()) == NULL((void*)0)) |
| 725 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 725, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
| 726 | if ((r = sshkey_froms(e->request, &key)) != 0 || |
| 727 | (r = sshbuf_get_stringb(e->request, data)) != 0 || |
| 728 | (r = sshbuf_get_u32(e->request, &flags)) != 0) { |
| 729 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 729, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 730 | goto send; |
| 731 | } |
| 732 | |
| 733 | if ((id = lookup_identity(key)) == NULL((void*)0)) { |
| 734 | verbose_f("%s key not found", sshkey_type(key))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 734, 1, SYSLOG_LEVEL_VERBOSE, ((void*)0), "%s key not found" , sshkey_type(key)); |
| 735 | goto send; |
| 736 | } |
| 737 | if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT2, |
| 738 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 739 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 739, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 740 | |
| 741 | if (id->ndest_constraints != 0) { |
| 742 | if (e->nsession_ids == 0) { |
| 743 | logit_f("refusing use of destination-constrained key "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 744, 1, SYSLOG_LEVEL_INFO, ((void*)0), "refusing use of destination-constrained key " "to sign on unbound connection") |
| 744 | "to sign on unbound connection")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 744, 1, SYSLOG_LEVEL_INFO, ((void*)0), "refusing use of destination-constrained key " "to sign on unbound connection"); |
| 745 | goto send; |
| 746 | } |
| 747 | if (parse_userauth_request(data, key, &user, &sid, |
| 748 | &hostkey) != 0) { |
| 749 | logit_f("refusing use of destination-constrained key "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 750, 1, SYSLOG_LEVEL_INFO, ((void*)0), "refusing use of destination-constrained key " "to sign an unidentified signature") |
| 750 | "to sign an unidentified signature")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 750, 1, SYSLOG_LEVEL_INFO, ((void*)0), "refusing use of destination-constrained key " "to sign an unidentified signature"); |
| 751 | goto send; |
| 752 | } |
| 753 | /* XXX logspam */ |
| 754 | debug_f("user=%s", user)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 754, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "user=%s", user); |
| 755 | if (identity_permitted(id, e, user, &fwd_host, &dest_host) != 0) |
| 756 | goto send; |
| 757 | /* XXX display fwd_host/dest_host in askpass UI */ |
| 758 | /* |
| 759 | * Ensure that the session ID is the most recent one |
| 760 | * registered on the socket - it should have been bound by |
| 761 | * ssh immediately before userauth. |
| 762 | */ |
| 763 | if (buf_equal(sid, |
| 764 | e->session_ids[e->nsession_ids - 1].sid) != 0) { |
| 765 | error_f("unexpected session ID (%zu listed) on "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 768, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected session ID (%zu listed) on " "signature request for target user %s with " "key %s %s", e-> nsession_ids, user, sshkey_type(id->key), fp) |
| 766 | "signature request for target user %s with "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 768, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected session ID (%zu listed) on " "signature request for target user %s with " "key %s %s", e-> nsession_ids, user, sshkey_type(id->key), fp) |
| 767 | "key %s %s", e->nsession_ids, user,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 768, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected session ID (%zu listed) on " "signature request for target user %s with " "key %s %s", e-> nsession_ids, user, sshkey_type(id->key), fp) |
| 768 | sshkey_type(id->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 768, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected session ID (%zu listed) on " "signature request for target user %s with " "key %s %s", e-> nsession_ids, user, sshkey_type(id->key), fp); |
| 769 | goto send; |
| 770 | } |
| 771 | /* |
| 772 | * Ensure that the hostkey embedded in the signature matches |
| 773 | * the one most recently bound to the socket. An exception is |
| 774 | * made for the initial forwarding hop. |
| 775 | */ |
| 776 | if (e->nsession_ids > 1 && hostkey == NULL((void*)0)) { |
| 777 | error_f("refusing use of destination-constrained key: "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 779, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "no hostkey recorded in signature for forwarded " "connection" ) |
| 778 | "no hostkey recorded in signature for forwarded "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 779, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "no hostkey recorded in signature for forwarded " "connection" ) |
| 779 | "connection")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 779, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "no hostkey recorded in signature for forwarded " "connection" ); |
| 780 | goto send; |
| 781 | } |
| 782 | if (hostkey != NULL((void*)0) && !sshkey_equal(hostkey, |
| 783 | e->session_ids[e->nsession_ids - 1].key)) { |
| 784 | error_f("refusing use of destination-constrained key: "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 786, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "mismatch between hostkey in request and most " "recently bound session" ) |
| 785 | "mismatch between hostkey in request and most "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 786, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "mismatch between hostkey in request and most " "recently bound session" ) |
| 786 | "recently bound session")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 786, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "refusing use of destination-constrained key: " "mismatch between hostkey in request and most " "recently bound session" ); |
| 787 | goto send; |
| 788 | } |
| 789 | xasprintf(&sig_dest, "public key authentication request for " |
| 790 | "user \"%s\" to listed host", user); |
| 791 | } |
| 792 | if (id->confirm && confirm_key(id, sig_dest) != 0) { |
| 793 | verbose_f("user refused key")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 793, 1, SYSLOG_LEVEL_VERBOSE, ((void*)0), "user refused key" ); |
| 794 | goto send; |
| 795 | } |
| 796 | if (sshkey_is_sk(id->key)) { |
| 797 | if (strncmp(id->key->sk_application, "ssh:", 4) != 0 && |
| 798 | !check_websafe_message_contents(key, data)) { |
| 799 | /* error already logged */ |
| 800 | goto send; |
| 801 | } |
| 802 | if ((id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD0x01)) { |
| 803 | notifier = notify_start(0, |
| 804 | "Confirm user presence for key %s %s%s%s", |
| 805 | sshkey_type(id->key), fp, |
| 806 | sig_dest == NULL((void*)0) ? "" : "\n", |
| 807 | sig_dest == NULL((void*)0) ? "" : sig_dest); |
| 808 | } |
| 809 | } |
| 810 | /* XXX support PIN required FIDO keys */ |
| 811 | if ((r = sshkey_sign(id->key, &signature, &slen, |
| 812 | sshbuf_ptr(data), sshbuf_len(data), agent_decode_alg(key, flags), |
| 813 | id->sk_provider, NULL((void*)0), compat)) != 0) { |
| 814 | error_fr(r, "sshkey_sign")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 814, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "sshkey_sign"); |
| 815 | goto send; |
| 816 | } |
| 817 | /* Success */ |
| 818 | ok = 0; |
| 819 | send: |
| 820 | notify_complete(notifier, "User presence confirmed"); |
| 821 | |
| 822 | if (ok == 0) { |
| 823 | if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE14)) != 0 || |
| 824 | (r = sshbuf_put_string(msg, signature, slen)) != 0) |
| 825 | fatal_fr(r, "compose")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 825, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose"); |
| 826 | } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE5)) != 0) |
| 827 | fatal_fr(r, "compose failure")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 827, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose failure"); |
| 828 | |
| 829 | if ((r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 830 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 830, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 831 | |
| 832 | sshbuf_free(sid); |
| 833 | sshbuf_free(data); |
| 834 | sshbuf_free(msg); |
| 835 | sshkey_free(key); |
| 836 | sshkey_free(hostkey); |
| 837 | free(fp); |
| 838 | free(signature); |
| 839 | free(sig_dest); |
| 840 | free(user); |
| 841 | } |
| 842 | |
| 843 | /* shared */ |
| 844 | static void |
| 845 | process_remove_identity(SocketEntry *e) |
| 846 | { |
| 847 | int r, success = 0; |
| 848 | struct sshkey *key = NULL((void*)0); |
| 849 | Identity *id; |
| 850 | |
| 851 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 851, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 852 | if ((r = sshkey_froms(e->request, &key)) != 0) { |
| 853 | error_fr(r, "parse key")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 853, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse key"); |
| 854 | goto done; |
| 855 | } |
| 856 | if ((id = lookup_identity(key)) == NULL((void*)0)) { |
| 857 | debug_f("key not found")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 857, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "key not found"); |
| 858 | goto done; |
| 859 | } |
| 860 | /* identity not visible, cannot be removed */ |
| 861 | if (identity_permitted(id, e, NULL((void*)0), NULL((void*)0), NULL((void*)0)) != 0) |
| 862 | goto done; /* error already logged */ |
| 863 | /* We have this key, free it. */ |
| 864 | if (idtab->nentries < 1) |
| 865 | fatal_f("internal error: nentries %d", idtab->nentries)sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 865, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "internal error: nentries %d" , idtab->nentries); |
| 866 | TAILQ_REMOVE(&idtab->idlist, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& idtab->idlist)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 867 | free_identity(id); |
| 868 | idtab->nentries--; |
| 869 | success = 1; |
| 870 | done: |
| 871 | sshkey_free(key); |
| 872 | send_status(e, success); |
| 873 | } |
| 874 | |
| 875 | static void |
| 876 | process_remove_all_identities(SocketEntry *e) |
| 877 | { |
| 878 | Identity *id; |
| 879 | |
| 880 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 880, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 881 | /* Loop over all identities and clear the keys. */ |
| 882 | for (id = TAILQ_FIRST(&idtab->idlist)((&idtab->idlist)->tqh_first); id; |
| 883 | id = TAILQ_FIRST(&idtab->idlist)((&idtab->idlist)->tqh_first)) { |
| 884 | TAILQ_REMOVE(&idtab->idlist, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& idtab->idlist)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 885 | free_identity(id); |
| 886 | } |
| 887 | |
| 888 | /* Mark that there are no identities. */ |
| 889 | idtab->nentries = 0; |
| 890 | |
| 891 | /* Send success. */ |
| 892 | send_status(e, 1); |
| 893 | } |
| 894 | |
| 895 | /* removes expired keys and returns number of seconds until the next expiry */ |
| 896 | static time_t |
| 897 | reaper(void) |
| 898 | { |
| 899 | time_t deadline = 0, now = monotime(); |
| 900 | Identity *id, *nxt; |
| 901 | |
| 902 | for (id = TAILQ_FIRST(&idtab->idlist)((&idtab->idlist)->tqh_first); id; id = nxt) { |
| 903 | nxt = TAILQ_NEXT(id, next)((id)->next.tqe_next); |
| 904 | if (id->death == 0) |
| 905 | continue; |
| 906 | if (now >= id->death) { |
| 907 | debug("expiring key '%s'", id->comment)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 907, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "expiring key '%s'" , id->comment); |
| 908 | TAILQ_REMOVE(&idtab->idlist, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& idtab->idlist)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 909 | free_identity(id); |
| 910 | idtab->nentries--; |
| 911 | } else |
| 912 | deadline = (deadline == 0) ? id->death : |
| 913 | MINIMUM(deadline, id->death)(((deadline) < (id->death)) ? (deadline) : (id->death )); |
| 914 | } |
| 915 | if (deadline == 0 || deadline <= now) |
| 916 | return 0; |
| 917 | else |
| 918 | return (deadline - now); |
| 919 | } |
| 920 | |
| 921 | static int |
| 922 | parse_dest_constraint_hop(struct sshbuf *b, struct dest_constraint_hop *dch) |
| 923 | { |
| 924 | u_char key_is_ca; |
| 925 | size_t elen = 0; |
| 926 | int r; |
| 927 | struct sshkey *k = NULL((void*)0); |
| 928 | char *fp; |
| 929 | |
| 930 | memset(dch, '\0', sizeof(*dch)); |
| 931 | if ((r = sshbuf_get_cstring(b, &dch->user, NULL((void*)0))) != 0 || |
| 932 | (r = sshbuf_get_cstring(b, &dch->hostname, NULL((void*)0))) != 0 || |
| 933 | (r = sshbuf_get_string_direct(b, NULL((void*)0), &elen)) != 0) { |
| 934 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 934, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 935 | goto out; |
| 936 | } |
| 937 | if (elen != 0) { |
| 938 | error_f("unsupported extensions (len %zu)", elen)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 938, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported extensions (len %zu)" , elen); |
| 939 | r = SSH_ERR_FEATURE_UNSUPPORTED-59; |
| 940 | goto out; |
| 941 | } |
| 942 | if (*dch->hostname == '\0') { |
| 943 | free(dch->hostname); |
| 944 | dch->hostname = NULL((void*)0); |
| 945 | } |
| 946 | if (*dch->user == '\0') { |
| 947 | free(dch->user); |
| 948 | dch->user = NULL((void*)0); |
| 949 | } |
| 950 | while (sshbuf_len(b) != 0) { |
| 951 | dch->keys = xrecallocarray(dch->keys, dch->nkeys, |
| 952 | dch->nkeys + 1, sizeof(*dch->keys)); |
| 953 | dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys, |
| 954 | dch->nkeys + 1, sizeof(*dch->key_is_ca)); |
| 955 | if ((r = sshkey_froms(b, &k)) != 0 || |
| 956 | (r = sshbuf_get_u8(b, &key_is_ca)) != 0) |
| 957 | goto out; |
| 958 | if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT2, |
| 959 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 960 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 960, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 961 | debug3_f("%s%s%s: adding %skey %s %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 964, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s%s%s: adding %skey %s %s" , dch->user == ((void*)0) ? "" : dch->user, dch->user == ((void*)0) ? "" : "@", dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp) |
| 962 | dch->user == NULL ? "" : dch->user,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 964, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s%s%s: adding %skey %s %s" , dch->user == ((void*)0) ? "" : dch->user, dch->user == ((void*)0) ? "" : "@", dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp) |
| 963 | dch->user == NULL ? "" : "@",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 964, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s%s%s: adding %skey %s %s" , dch->user == ((void*)0) ? "" : dch->user, dch->user == ((void*)0) ? "" : "@", dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp) |
| 964 | dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 964, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s%s%s: adding %skey %s %s" , dch->user == ((void*)0) ? "" : dch->user, dch->user == ((void*)0) ? "" : "@", dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp); |
| 965 | free(fp); |
| 966 | dch->keys[dch->nkeys] = k; |
| 967 | dch->key_is_ca[dch->nkeys] = key_is_ca != 0; |
| 968 | dch->nkeys++; |
| 969 | k = NULL((void*)0); /* transferred */ |
| 970 | } |
| 971 | /* success */ |
| 972 | r = 0; |
| 973 | out: |
| 974 | sshkey_free(k); |
| 975 | return r; |
| 976 | } |
| 977 | |
| 978 | static int |
| 979 | parse_dest_constraint(struct sshbuf *m, struct dest_constraint *dc) |
| 980 | { |
| 981 | struct sshbuf *b = NULL((void*)0), *frombuf = NULL((void*)0), *tobuf = NULL((void*)0); |
| 982 | int r; |
| 983 | size_t elen = 0; |
| 984 | |
| 985 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 985, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
| 986 | |
| 987 | memset(dc, '\0', sizeof(*dc)); |
| 988 | if ((r = sshbuf_froms(m, &b)) != 0 || |
| 989 | (r = sshbuf_froms(b, &frombuf)) != 0 || |
| 990 | (r = sshbuf_froms(b, &tobuf)) != 0 || |
| 991 | (r = sshbuf_get_string_direct(b, NULL((void*)0), &elen)) != 0) { |
| 992 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 992, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 993 | goto out; |
| 994 | } |
| 995 | if ((r = parse_dest_constraint_hop(frombuf, &dc->from) != 0) || |
| 996 | (r = parse_dest_constraint_hop(tobuf, &dc->to) != 0)) |
| 997 | goto out; /* already logged */ |
| 998 | if (elen != 0) { |
| 999 | error_f("unsupported extensions (len %zu)", elen)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 999, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported extensions (len %zu)" , elen); |
| 1000 | r = SSH_ERR_FEATURE_UNSUPPORTED-59; |
| 1001 | goto out; |
| 1002 | } |
| 1003 | debug2_f("parsed %s (%u keys) > %s%s%s (%u keys)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1006, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "parsed %s (%u keys) > %s%s%s (%u keys)" , dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc ->from.nkeys, dc->to.user ? dc->to.user : "", dc-> to.user ? "@" : "", dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys) |
| 1004 | dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1006, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "parsed %s (%u keys) > %s%s%s (%u keys)" , dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc ->from.nkeys, dc->to.user ? dc->to.user : "", dc-> to.user ? "@" : "", dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys) |
| 1005 | dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1006, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "parsed %s (%u keys) > %s%s%s (%u keys)" , dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc ->from.nkeys, dc->to.user ? dc->to.user : "", dc-> to.user ? "@" : "", dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys) |
| 1006 | dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1006, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "parsed %s (%u keys) > %s%s%s (%u keys)" , dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc ->from.nkeys, dc->to.user ? dc->to.user : "", dc-> to.user ? "@" : "", dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys); |
| 1007 | /* check consistency */ |
| 1008 | if ((dc->from.hostname == NULL((void*)0)) != (dc->from.nkeys == 0) || |
| 1009 | dc->from.user != NULL((void*)0)) { |
| 1010 | error_f("inconsistent \"from\" specification")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1010, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "inconsistent \"from\" specification" ); |
| 1011 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1012 | goto out; |
| 1013 | } |
| 1014 | if (dc->to.hostname == NULL((void*)0) || dc->to.nkeys == 0) { |
| 1015 | error_f("incomplete \"to\" specification")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1015, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "incomplete \"to\" specification" ); |
| 1016 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1017 | goto out; |
| 1018 | } |
| 1019 | /* success */ |
| 1020 | r = 0; |
| 1021 | out: |
| 1022 | sshbuf_free(b); |
| 1023 | sshbuf_free(frombuf); |
| 1024 | sshbuf_free(tobuf); |
| 1025 | return r; |
| 1026 | } |
| 1027 | |
| 1028 | static int |
| 1029 | parse_key_constraint_extension(struct sshbuf *m, char **sk_providerp, |
| 1030 | struct dest_constraint **dcsp, size_t *ndcsp) |
| 1031 | { |
| 1032 | char *ext_name = NULL((void*)0); |
| 1033 | int r; |
| 1034 | struct sshbuf *b = NULL((void*)0); |
| 1035 | |
| 1036 | if ((r = sshbuf_get_cstring(m, &ext_name, NULL((void*)0))) != 0) { |
| 1037 | error_fr(r, "parse constraint extension")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1037, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse constraint extension" ); |
| 1038 | goto out; |
| 1039 | } |
| 1040 | debug_f("constraint ext %s", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1040, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "constraint ext %s" , ext_name); |
| 1041 | if (strcmp(ext_name, "sk-provider@openssh.com") == 0) { |
| 1042 | if (sk_providerp == NULL((void*)0)) { |
| 1043 | error_f("%s not valid here", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1043, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "%s not valid here" , ext_name); |
| 1044 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1045 | goto out; |
| 1046 | } |
| 1047 | if (*sk_providerp != NULL((void*)0)) { |
| 1048 | error_f("%s already set", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1048, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "%s already set", ext_name ); |
| 1049 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1050 | goto out; |
| 1051 | } |
| 1052 | if ((r = sshbuf_get_cstring(m, sk_providerp, NULL((void*)0))) != 0) { |
| 1053 | error_fr(r, "parse %s", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1053, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse %s", ext_name ); |
| 1054 | goto out; |
| 1055 | } |
| 1056 | } else if (strcmp(ext_name, |
| 1057 | "restrict-destination-v00@openssh.com") == 0) { |
| 1058 | if (*dcsp != NULL((void*)0)) { |
| 1059 | error_f("%s already set", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1059, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "%s already set", ext_name ); |
| 1060 | goto out; |
| 1061 | } |
| 1062 | if ((r = sshbuf_froms(m, &b)) != 0) { |
| 1063 | error_fr(r, "parse %s outer", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1063, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse %s outer", ext_name ); |
| 1064 | goto out; |
| 1065 | } |
| 1066 | while (sshbuf_len(b) != 0) { |
| 1067 | if (*ndcsp >= AGENT_MAX_DEST_CONSTRAINTS1024) { |
| 1068 | error_f("too many %s constraints", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1068, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "too many %s constraints" , ext_name); |
| 1069 | goto out; |
| 1070 | } |
| 1071 | *dcsp = xrecallocarray(*dcsp, *ndcsp, *ndcsp + 1, |
| 1072 | sizeof(**dcsp)); |
| 1073 | if ((r = parse_dest_constraint(b, |
| 1074 | *dcsp + (*ndcsp)++)) != 0) |
| 1075 | goto out; /* error already logged */ |
| 1076 | } |
| 1077 | } else { |
| 1078 | error_f("unsupported constraint \"%s\"", ext_name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1078, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported constraint \"%s\"" , ext_name); |
| 1079 | r = SSH_ERR_FEATURE_UNSUPPORTED-59; |
| 1080 | goto out; |
| 1081 | } |
| 1082 | /* success */ |
| 1083 | r = 0; |
| 1084 | out: |
| 1085 | free(ext_name); |
| 1086 | sshbuf_free(b); |
| 1087 | return r; |
| 1088 | } |
| 1089 | |
| 1090 | static int |
| 1091 | parse_key_constraints(struct sshbuf *m, struct sshkey *k, time_t *deathp, |
| 1092 | u_int *secondsp, int *confirmp, char **sk_providerp, |
| 1093 | struct dest_constraint **dcsp, size_t *ndcsp) |
| 1094 | { |
| 1095 | u_char ctype; |
| 1096 | int r; |
| 1097 | u_int seconds, maxsign = 0; |
| 1098 | |
| 1099 | while (sshbuf_len(m)) { |
| 1100 | if ((r = sshbuf_get_u8(m, &ctype)) != 0) { |
| 1101 | error_fr(r, "parse constraint type")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1101, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse constraint type" ); |
| 1102 | goto out; |
| 1103 | } |
| 1104 | switch (ctype) { |
| 1105 | case SSH_AGENT_CONSTRAIN_LIFETIME1: |
| 1106 | if (*deathp != 0) { |
| 1107 | error_f("lifetime already set")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1107, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "lifetime already set" ); |
| 1108 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1109 | goto out; |
| 1110 | } |
| 1111 | if ((r = sshbuf_get_u32(m, &seconds)) != 0) { |
| 1112 | error_fr(r, "parse lifetime constraint")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1112, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse lifetime constraint" ); |
| 1113 | goto out; |
| 1114 | } |
| 1115 | *deathp = monotime() + seconds; |
| 1116 | *secondsp = seconds; |
| 1117 | break; |
| 1118 | case SSH_AGENT_CONSTRAIN_CONFIRM2: |
| 1119 | if (*confirmp != 0) { |
| 1120 | error_f("confirm already set")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1120, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "confirm already set" ); |
| 1121 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1122 | goto out; |
| 1123 | } |
| 1124 | *confirmp = 1; |
| 1125 | break; |
| 1126 | case SSH_AGENT_CONSTRAIN_MAXSIGN3: |
| 1127 | if (k == NULL((void*)0)) { |
| 1128 | error_f("maxsign not valid here")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1128, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "maxsign not valid here" ); |
| 1129 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1130 | goto out; |
| 1131 | } |
| 1132 | if (maxsign != 0) { |
| 1133 | error_f("maxsign already set")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1133, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "maxsign already set" ); |
| 1134 | r = SSH_ERR_INVALID_FORMAT-4; |
| 1135 | goto out; |
| 1136 | } |
| 1137 | if ((r = sshbuf_get_u32(m, &maxsign)) != 0) { |
| 1138 | error_fr(r, "parse maxsign constraint")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1138, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse maxsign constraint" ); |
| 1139 | goto out; |
| 1140 | } |
| 1141 | if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) { |
| 1142 | error_fr(r, "enable maxsign")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1142, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "enable maxsign"); |
| 1143 | goto out; |
| 1144 | } |
| 1145 | break; |
| 1146 | case SSH_AGENT_CONSTRAIN_EXTENSION255: |
| 1147 | if ((r = parse_key_constraint_extension(m, |
| 1148 | sk_providerp, dcsp, ndcsp)) != 0) |
| 1149 | goto out; /* error already logged */ |
| 1150 | break; |
| 1151 | default: |
| 1152 | error_f("Unknown constraint %d", ctype)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1152, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "Unknown constraint %d" , ctype); |
| 1153 | r = SSH_ERR_FEATURE_UNSUPPORTED-59; |
| 1154 | goto out; |
| 1155 | } |
| 1156 | } |
| 1157 | /* success */ |
| 1158 | r = 0; |
| 1159 | out: |
| 1160 | return r; |
| 1161 | } |
| 1162 | |
| 1163 | static void |
| 1164 | process_add_identity(SocketEntry *e) |
| 1165 | { |
| 1166 | Identity *id; |
| 1167 | int success = 0, confirm = 0; |
| 1168 | char *fp, *comment = NULL((void*)0), *sk_provider = NULL((void*)0); |
| 1169 | char canonical_provider[PATH_MAX1024]; |
| 1170 | time_t death = 0; |
| 1171 | u_int seconds = 0; |
| 1172 | struct dest_constraint *dest_constraints = NULL((void*)0); |
| 1173 | size_t ndest_constraints = 0; |
| 1174 | struct sshkey *k = NULL((void*)0); |
| 1175 | int r = SSH_ERR_INTERNAL_ERROR-1; |
| 1176 | |
| 1177 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1177, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1178 | if ((r = sshkey_private_deserialize(e->request, &k)) != 0 || |
| 1179 | k == NULL((void*)0) || |
| 1180 | (r = sshbuf_get_cstring(e->request, &comment, NULL((void*)0))) != 0) { |
| 1181 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1181, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1182 | goto out; |
| 1183 | } |
| 1184 | if (parse_key_constraints(e->request, k, &death, &seconds, &confirm, |
| 1185 | &sk_provider, &dest_constraints, &ndest_constraints) != 0) { |
| 1186 | error_f("failed to parse constraints")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1186, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "failed to parse constraints" ); |
| 1187 | sshbuf_reset(e->request); |
| 1188 | goto out; |
| 1189 | } |
| 1190 | |
| 1191 | if (sk_provider != NULL((void*)0)) { |
| 1192 | if (!sshkey_is_sk(k)) { |
| 1193 | error("Cannot add provider: %s is not an "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1194, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Cannot add provider: %s is not an " "authenticator-hosted key", sshkey_type(k)) |
| 1194 | "authenticator-hosted key", sshkey_type(k))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1194, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Cannot add provider: %s is not an " "authenticator-hosted key", sshkey_type(k)); |
| 1195 | goto out; |
| 1196 | } |
| 1197 | if (strcasecmp(sk_provider, "internal") == 0) { |
| 1198 | debug_f("internal provider")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1198, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "internal provider" ); |
| 1199 | } else { |
| 1200 | if (realpath(sk_provider, canonical_provider) == NULL((void*)0)) { |
| 1201 | verbose("failed provider \"%.100s\": "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1203, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed provider \"%.100s\": " "realpath: %s", sk_provider, strerror((*__errno()))) |
| 1202 | "realpath: %s", sk_provider,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1203, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed provider \"%.100s\": " "realpath: %s", sk_provider, strerror((*__errno()))) |
| 1203 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1203, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed provider \"%.100s\": " "realpath: %s", sk_provider, strerror((*__errno()))); |
| 1204 | goto out; |
| 1205 | } |
| 1206 | free(sk_provider); |
| 1207 | sk_provider = xstrdup(canonical_provider); |
| 1208 | if (match_pattern_list(sk_provider, |
| 1209 | allowed_providers, 0) != 1) { |
| 1210 | error("Refusing add key: "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1211, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Refusing add key: " "provider %s not allowed", sk_provider) |
| 1211 | "provider %s not allowed", sk_provider)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1211, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Refusing add key: " "provider %s not allowed", sk_provider); |
| 1212 | goto out; |
| 1213 | } |
| 1214 | } |
| 1215 | } |
| 1216 | if ((r = sshkey_shield_private(k)) != 0) { |
| 1217 | error_fr(r, "shield private")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1217, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "shield private"); |
| 1218 | goto out; |
| 1219 | } |
| 1220 | if (lifetime && !death) |
| 1221 | death = monotime() + lifetime; |
| 1222 | if ((id = lookup_identity(k)) == NULL((void*)0)) { |
| 1223 | id = xcalloc(1, sizeof(Identity)); |
| 1224 | TAILQ_INSERT_TAIL(&idtab->idlist, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (&idtab->idlist)->tqh_last; *(&idtab->idlist )->tqh_last = (id); (&idtab->idlist)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1225 | /* Increment the number of identities. */ |
| 1226 | idtab->nentries++; |
| 1227 | } else { |
| 1228 | /* identity not visible, do not update */ |
| 1229 | if (identity_permitted(id, e, NULL((void*)0), NULL((void*)0), NULL((void*)0)) != 0) |
| 1230 | goto out; /* error already logged */ |
| 1231 | /* key state might have been updated */ |
| 1232 | sshkey_free(id->key); |
| 1233 | free(id->comment); |
| 1234 | free(id->sk_provider); |
| 1235 | free_dest_constraints(id->dest_constraints, |
| 1236 | id->ndest_constraints); |
| 1237 | } |
| 1238 | /* success */ |
| 1239 | id->key = k; |
| 1240 | id->comment = comment; |
| 1241 | id->death = death; |
| 1242 | id->confirm = confirm; |
| 1243 | id->sk_provider = sk_provider; |
| 1244 | id->dest_constraints = dest_constraints; |
| 1245 | id->ndest_constraints = ndest_constraints; |
| 1246 | |
| 1247 | if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT2, |
| 1248 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 1249 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1249, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshkey_fingerprint failed" ); |
| 1250 | debug_f("add %s %s \"%.100s\" (life: %u) (confirm: %u) "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1253, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "add %s %s \"%.100s\" (life: %u) (confirm: %u) " "(provider: %s) (destination constraints: %zu)", sshkey_ssh_name (k), fp, comment, seconds, confirm, sk_provider == ((void*)0) ? "none" : sk_provider, ndest_constraints) |
| 1251 | "(provider: %s) (destination constraints: %zu)",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1253, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "add %s %s \"%.100s\" (life: %u) (confirm: %u) " "(provider: %s) (destination constraints: %zu)", sshkey_ssh_name (k), fp, comment, seconds, confirm, sk_provider == ((void*)0) ? "none" : sk_provider, ndest_constraints) |
| 1252 | sshkey_ssh_name(k), fp, comment, seconds, confirm,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1253, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "add %s %s \"%.100s\" (life: %u) (confirm: %u) " "(provider: %s) (destination constraints: %zu)", sshkey_ssh_name (k), fp, comment, seconds, confirm, sk_provider == ((void*)0) ? "none" : sk_provider, ndest_constraints) |
| 1253 | sk_provider == NULL ? "none" : sk_provider, ndest_constraints)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1253, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "add %s %s \"%.100s\" (life: %u) (confirm: %u) " "(provider: %s) (destination constraints: %zu)", sshkey_ssh_name (k), fp, comment, seconds, confirm, sk_provider == ((void*)0) ? "none" : sk_provider, ndest_constraints); |
| 1254 | free(fp); |
| 1255 | /* transferred */ |
| 1256 | k = NULL((void*)0); |
| 1257 | comment = NULL((void*)0); |
| 1258 | sk_provider = NULL((void*)0); |
| 1259 | dest_constraints = NULL((void*)0); |
| 1260 | ndest_constraints = 0; |
| 1261 | success = 1; |
| 1262 | out: |
| 1263 | free(sk_provider); |
| 1264 | free(comment); |
| 1265 | sshkey_free(k); |
| 1266 | free_dest_constraints(dest_constraints, ndest_constraints); |
| 1267 | send_status(e, success); |
| 1268 | } |
| 1269 | |
| 1270 | /* XXX todo: encrypt sensitive data with passphrase */ |
| 1271 | static void |
| 1272 | process_lock_agent(SocketEntry *e, int lock) |
| 1273 | { |
| 1274 | int r, success = 0, delay; |
| 1275 | char *passwd; |
| 1276 | u_char passwdhash[LOCK_SIZE32]; |
| 1277 | static u_int fail_count = 0; |
| 1278 | size_t pwlen; |
| 1279 | |
| 1280 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1280, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1281 | /* |
| 1282 | * This is deliberately fatal: the user has requested that we lock, |
| 1283 | * but we can't parse their request properly. The only safe thing to |
| 1284 | * do is abort. |
| 1285 | */ |
| 1286 | if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0) |
| 1287 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1287, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 1288 | if (pwlen == 0) { |
| 1289 | debug("empty password not supported")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1289, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "empty password not supported" ); |
| 1290 | } else if (locked && !lock) { |
| 1291 | if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt), |
| 1292 | passwdhash, sizeof(passwdhash), LOCK_ROUNDS1) < 0) |
| 1293 | fatal("bcrypt_pbkdf")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1293, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "bcrypt_pbkdf"); |
| 1294 | if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE32) == 0) { |
| 1295 | debug("agent unlocked")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1295, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "agent unlocked"); |
| 1296 | locked = 0; |
| 1297 | fail_count = 0; |
| 1298 | explicit_bzero(lock_pwhash, sizeof(lock_pwhash)); |
| 1299 | success = 1; |
| 1300 | } else { |
| 1301 | /* delay in 0.1s increments up to 10s */ |
| 1302 | if (fail_count < 100) |
| 1303 | fail_count++; |
| 1304 | delay = 100000 * fail_count; |
| 1305 | debug("unlock failed, delaying %0.1lf seconds",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1306, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "unlock failed, delaying %0.1lf seconds" , (double)delay/1000000) |
| 1306 | (double)delay/1000000)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1306, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "unlock failed, delaying %0.1lf seconds" , (double)delay/1000000); |
| 1307 | usleep(delay); |
| 1308 | } |
| 1309 | explicit_bzero(passwdhash, sizeof(passwdhash)); |
| 1310 | } else if (!locked && lock) { |
| 1311 | debug("agent locked")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1311, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "agent locked"); |
| 1312 | locked = 1; |
| 1313 | arc4random_buf(lock_salt, sizeof(lock_salt)); |
| 1314 | if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt), |
| 1315 | lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS1) < 0) |
| 1316 | fatal("bcrypt_pbkdf")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1316, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "bcrypt_pbkdf"); |
| 1317 | success = 1; |
| 1318 | } |
| 1319 | freezero(passwd, pwlen); |
| 1320 | send_status(e, success); |
| 1321 | } |
| 1322 | |
| 1323 | static void |
| 1324 | no_identities(SocketEntry *e) |
| 1325 | { |
| 1326 | struct sshbuf *msg; |
| 1327 | int r; |
| 1328 | |
| 1329 | if ((msg = sshbuf_new()) == NULL((void*)0)) |
| 1330 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1330, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
| 1331 | if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER12)) != 0 || |
| 1332 | (r = sshbuf_put_u32(msg, 0)) != 0 || |
| 1333 | (r = sshbuf_put_stringb(e->output, msg)) != 0) |
| 1334 | fatal_fr(r, "compose")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1334, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose"); |
| 1335 | sshbuf_free(msg); |
| 1336 | } |
| 1337 | |
| 1338 | #ifdef ENABLE_PKCS111 |
| 1339 | static void |
| 1340 | process_add_smartcard_key(SocketEntry *e) |
| 1341 | { |
| 1342 | char *provider = NULL((void*)0), *pin = NULL((void*)0), canonical_provider[PATH_MAX1024]; |
| 1343 | char **comments = NULL((void*)0); |
| 1344 | int r, i, count = 0, success = 0, confirm = 0; |
| 1345 | u_int seconds = 0; |
| 1346 | time_t death = 0; |
| 1347 | struct sshkey **keys = NULL((void*)0), *k; |
| 1348 | Identity *id; |
| 1349 | struct dest_constraint *dest_constraints = NULL((void*)0); |
| 1350 | size_t ndest_constraints = 0; |
| 1351 | |
| 1352 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1352, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1353 | if ((r = sshbuf_get_cstring(e->request, &provider, NULL((void*)0))) != 0 || |
| 1354 | (r = sshbuf_get_cstring(e->request, &pin, NULL((void*)0))) != 0) { |
| 1355 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1355, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1356 | goto send; |
| 1357 | } |
| 1358 | if (parse_key_constraints(e->request, NULL((void*)0), &death, &seconds, &confirm, |
| 1359 | NULL((void*)0), &dest_constraints, &ndest_constraints) != 0) { |
| 1360 | error_f("failed to parse constraints")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1360, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "failed to parse constraints" ); |
| 1361 | goto send; |
| 1362 | } |
| 1363 | if (realpath(provider, canonical_provider) == NULL((void*)0)) { |
| 1364 | verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1365, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed PKCS#11 add of \"%.100s\": realpath: %s" , provider, strerror((*__errno()))) |
| 1365 | provider, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1365, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed PKCS#11 add of \"%.100s\": realpath: %s" , provider, strerror((*__errno()))); |
| 1366 | goto send; |
| 1367 | } |
| 1368 | if (match_pattern_list(canonical_provider, allowed_providers, 0) != 1) { |
| 1369 | verbose("refusing PKCS#11 add of \"%.100s\": "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1370, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "refusing PKCS#11 add of \"%.100s\": " "provider not allowed", canonical_provider) |
| 1370 | "provider not allowed", canonical_provider)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1370, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "refusing PKCS#11 add of \"%.100s\": " "provider not allowed", canonical_provider); |
| 1371 | goto send; |
| 1372 | } |
| 1373 | debug_f("add %.100s", canonical_provider)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1373, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "add %.100s", canonical_provider ); |
| 1374 | if (lifetime && !death) |
| 1375 | death = monotime() + lifetime; |
| 1376 | |
| 1377 | count = pkcs11_add_provider(canonical_provider, pin, &keys, &comments); |
| 1378 | for (i = 0; i < count; i++) { |
| 1379 | k = keys[i]; |
| 1380 | if (lookup_identity(k) == NULL((void*)0)) { |
| 1381 | id = xcalloc(1, sizeof(Identity)); |
| 1382 | id->key = k; |
| 1383 | keys[i] = NULL((void*)0); /* transferred */ |
| 1384 | id->provider = xstrdup(canonical_provider); |
| 1385 | if (*comments[i] != '\0') { |
| 1386 | id->comment = comments[i]; |
| 1387 | comments[i] = NULL((void*)0); /* transferred */ |
| 1388 | } else { |
| 1389 | id->comment = xstrdup(canonical_provider); |
| 1390 | } |
| 1391 | id->death = death; |
| 1392 | id->confirm = confirm; |
| 1393 | id->dest_constraints = dest_constraints; |
| 1394 | id->ndest_constraints = ndest_constraints; |
| 1395 | dest_constraints = NULL((void*)0); /* transferred */ |
| 1396 | ndest_constraints = 0; |
| 1397 | TAILQ_INSERT_TAIL(&idtab->idlist, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (&idtab->idlist)->tqh_last; *(&idtab->idlist )->tqh_last = (id); (&idtab->idlist)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1398 | idtab->nentries++; |
| 1399 | success = 1; |
| 1400 | } |
| 1401 | /* XXX update constraints for existing keys */ |
| 1402 | sshkey_free(keys[i]); |
| 1403 | free(comments[i]); |
| 1404 | } |
| 1405 | send: |
| 1406 | free(pin); |
| 1407 | free(provider); |
| 1408 | free(keys); |
| 1409 | free(comments); |
| 1410 | free_dest_constraints(dest_constraints, ndest_constraints); |
| 1411 | send_status(e, success); |
| 1412 | } |
| 1413 | |
| 1414 | static void |
| 1415 | process_remove_smartcard_key(SocketEntry *e) |
| 1416 | { |
| 1417 | char *provider = NULL((void*)0), *pin = NULL((void*)0), canonical_provider[PATH_MAX1024]; |
| 1418 | int r, success = 0; |
| 1419 | Identity *id, *nxt; |
| 1420 | |
| 1421 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1421, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1422 | if ((r = sshbuf_get_cstring(e->request, &provider, NULL((void*)0))) != 0 || |
| 1423 | (r = sshbuf_get_cstring(e->request, &pin, NULL((void*)0))) != 0) { |
| 1424 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1424, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1425 | goto send; |
| 1426 | } |
| 1427 | free(pin); |
| 1428 | |
| 1429 | if (realpath(provider, canonical_provider) == NULL((void*)0)) { |
| 1430 | verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1431, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed PKCS#11 add of \"%.100s\": realpath: %s" , provider, strerror((*__errno()))) |
| 1431 | provider, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1431, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "failed PKCS#11 add of \"%.100s\": realpath: %s" , provider, strerror((*__errno()))); |
| 1432 | goto send; |
| 1433 | } |
| 1434 | |
| 1435 | debug_f("remove %.100s", canonical_provider)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1435, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "remove %.100s", canonical_provider ); |
| 1436 | for (id = TAILQ_FIRST(&idtab->idlist)((&idtab->idlist)->tqh_first); id; id = nxt) { |
| 1437 | nxt = TAILQ_NEXT(id, next)((id)->next.tqe_next); |
| 1438 | /* Skip file--based keys */ |
| 1439 | if (id->provider == NULL((void*)0)) |
| 1440 | continue; |
| 1441 | if (!strcmp(canonical_provider, id->provider)) { |
| 1442 | TAILQ_REMOVE(&idtab->idlist, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& idtab->idlist)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1443 | free_identity(id); |
| 1444 | idtab->nentries--; |
| 1445 | } |
| 1446 | } |
| 1447 | if (pkcs11_del_provider(canonical_provider) == 0) |
| 1448 | success = 1; |
| 1449 | else |
| 1450 | error_f("pkcs11_del_provider failed")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1450, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "pkcs11_del_provider failed" ); |
| 1451 | send: |
| 1452 | free(provider); |
| 1453 | send_status(e, success); |
| 1454 | } |
| 1455 | #endif /* ENABLE_PKCS11 */ |
| 1456 | |
| 1457 | static int |
| 1458 | process_ext_session_bind(SocketEntry *e) |
| 1459 | { |
| 1460 | int r, sid_match, key_match; |
| 1461 | struct sshkey *key = NULL((void*)0); |
| 1462 | struct sshbuf *sid = NULL((void*)0), *sig = NULL((void*)0); |
| 1463 | char *fp = NULL((void*)0); |
| 1464 | size_t i; |
| 1465 | u_char fwd = 0; |
| 1466 | |
| 1467 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1467, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1468 | if ((r = sshkey_froms(e->request, &key)) != 0 || |
| 1469 | (r = sshbuf_froms(e->request, &sid)) != 0 || |
| 1470 | (r = sshbuf_froms(e->request, &sig)) != 0 || |
| 1471 | (r = sshbuf_get_u8(e->request, &fwd)) != 0) { |
| 1472 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1472, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1473 | goto out; |
| 1474 | } |
| 1475 | if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT2, |
| 1476 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
| 1477 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1477, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
| 1478 | /* check signature with hostkey on session ID */ |
| 1479 | if ((r = sshkey_verify(key, sshbuf_ptr(sig), sshbuf_len(sig), |
| 1480 | sshbuf_ptr(sid), sshbuf_len(sid), NULL((void*)0), 0, NULL((void*)0))) != 0) { |
| 1481 | error_fr(r, "sshkey_verify for %s %s", sshkey_type(key), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1481, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "sshkey_verify for %s %s" , sshkey_type(key), fp); |
| 1482 | goto out; |
| 1483 | } |
| 1484 | /* check whether sid/key already recorded */ |
| 1485 | for (i = 0; i < e->nsession_ids; i++) { |
| 1486 | if (!e->session_ids[i].forwarded) { |
| 1487 | error_f("attempt to bind session ID to socket "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1488, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "attempt to bind session ID to socket " "previously bound for authentication attempt") |
| 1488 | "previously bound for authentication attempt")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1488, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "attempt to bind session ID to socket " "previously bound for authentication attempt"); |
| 1489 | r = -1; |
| 1490 | goto out; |
| 1491 | } |
| 1492 | sid_match = buf_equal(sid, e->session_ids[i].sid) == 0; |
| 1493 | key_match = sshkey_equal(key, e->session_ids[i].key); |
| 1494 | if (sid_match && key_match) { |
| 1495 | debug_f("session ID already recorded for %s %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1496, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "session ID already recorded for %s %s" , sshkey_type(key), fp) |
| 1496 | sshkey_type(key), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1496, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "session ID already recorded for %s %s" , sshkey_type(key), fp); |
| 1497 | r = 0; |
| 1498 | goto out; |
| 1499 | } else if (sid_match) { |
| 1500 | error_f("session ID recorded against different key "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1501, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "session ID recorded against different key " "for %s %s", sshkey_type(key), fp) |
| 1501 | "for %s %s", sshkey_type(key), fp)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1501, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "session ID recorded against different key " "for %s %s", sshkey_type(key), fp); |
| 1502 | r = -1; |
| 1503 | goto out; |
| 1504 | } |
| 1505 | /* |
| 1506 | * new sid with previously-seen key can happen, e.g. multiple |
| 1507 | * connections to the same host. |
| 1508 | */ |
| 1509 | } |
| 1510 | /* record new key/sid */ |
| 1511 | if (e->nsession_ids >= AGENT_MAX_SESSION_IDS16) { |
| 1512 | error_f("too many session IDs recorded")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1512, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "too many session IDs recorded" ); |
| 1513 | goto out; |
| 1514 | } |
| 1515 | e->session_ids = xrecallocarray(e->session_ids, e->nsession_ids, |
| 1516 | e->nsession_ids + 1, sizeof(*e->session_ids)); |
| 1517 | i = e->nsession_ids++; |
| 1518 | debug_f("recorded %s %s (slot %zu of %d)", sshkey_type(key), fp, i,sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1519, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "recorded %s %s (slot %zu of %d)" , sshkey_type(key), fp, i, 16) |
| 1519 | AGENT_MAX_SESSION_IDS)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1519, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "recorded %s %s (slot %zu of %d)" , sshkey_type(key), fp, i, 16); |
| 1520 | e->session_ids[i].key = key; |
| 1521 | e->session_ids[i].forwarded = fwd != 0; |
| 1522 | key = NULL((void*)0); /* transferred */ |
| 1523 | /* can't transfer sid; it's refcounted and scoped to request's life */ |
| 1524 | if ((e->session_ids[i].sid = sshbuf_new()) == NULL((void*)0)) |
| 1525 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1525, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
| 1526 | if ((r = sshbuf_putb(e->session_ids[i].sid, sid)) != 0) |
| 1527 | fatal_fr(r, "sshbuf_putb session ID")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1527, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putb session ID" ); |
| 1528 | /* success */ |
| 1529 | r = 0; |
| 1530 | out: |
| 1531 | sshkey_free(key); |
| 1532 | sshbuf_free(sid); |
| 1533 | sshbuf_free(sig); |
| 1534 | return r == 0 ? 1 : 0; |
| 1535 | } |
| 1536 | |
| 1537 | static void |
| 1538 | process_extension(SocketEntry *e) |
| 1539 | { |
| 1540 | int r, success = 0; |
| 1541 | char *name; |
| 1542 | |
| 1543 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1543, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
| 1544 | if ((r = sshbuf_get_cstring(e->request, &name, NULL((void*)0))) != 0) { |
| 1545 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1545, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1546 | goto send; |
| 1547 | } |
| 1548 | if (strcmp(name, "session-bind@openssh.com") == 0) |
| 1549 | success = process_ext_session_bind(e); |
| 1550 | else |
| 1551 | debug_f("unsupported extension \"%s\"", name)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1551, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "unsupported extension \"%s\"" , name); |
| 1552 | free(name); |
| 1553 | send: |
| 1554 | send_status(e, success); |
| 1555 | } |
| 1556 | /* |
| 1557 | * dispatch incoming message. |
| 1558 | * returns 1 on success, 0 for incomplete messages or -1 on error. |
| 1559 | */ |
| 1560 | static int |
| 1561 | process_message(u_int socknum) |
| 1562 | { |
| 1563 | u_int msg_len; |
| 1564 | u_char type; |
| 1565 | const u_char *cp; |
| 1566 | int r; |
| 1567 | SocketEntry *e; |
| 1568 | |
| 1569 | if (socknum >= sockets_alloc) |
| 1570 | fatal_f("sock %u >= allocated %u", socknum, sockets_alloc)sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1570, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sock %u >= allocated %u" , socknum, sockets_alloc); |
| 1571 | e = &sockets[socknum]; |
| 1572 | |
| 1573 | if (sshbuf_len(e->input) < 5) |
| 1574 | return 0; /* Incomplete message header. */ |
| 1575 | cp = sshbuf_ptr(e->input); |
| 1576 | msg_len = PEEK_U32(cp)(((u_int32_t)(((const u_char *)(cp))[0]) << 24) | ((u_int32_t )(((const u_char *)(cp))[1]) << 16) | ((u_int32_t)(((const u_char *)(cp))[2]) << 8) | (u_int32_t)(((const u_char * )(cp))[3])); |
| 1577 | if (msg_len > AGENT_MAX_LEN(256*1024)) { |
| 1578 | debug_f("socket %u (fd=%d) message too long %u > %u",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1579, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "socket %u (fd=%d) message too long %u > %u" , socknum, e->fd, msg_len, (256*1024)) |
| 1579 | socknum, e->fd, msg_len, AGENT_MAX_LEN)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1579, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "socket %u (fd=%d) message too long %u > %u" , socknum, e->fd, msg_len, (256*1024)); |
| 1580 | return -1; |
| 1581 | } |
| 1582 | if (sshbuf_len(e->input) < msg_len + 4) |
| 1583 | return 0; /* Incomplete message body. */ |
| 1584 | |
| 1585 | /* move the current input to e->request */ |
| 1586 | sshbuf_reset(e->request); |
| 1587 | if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 || |
| 1588 | (r = sshbuf_get_u8(e->request, &type)) != 0) { |
| 1589 | if (r == SSH_ERR_MESSAGE_INCOMPLETE-3 || |
| 1590 | r == SSH_ERR_STRING_TOO_LARGE-6) { |
| 1591 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1591, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 1592 | return -1; |
| 1593 | } |
| 1594 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1594, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 1595 | } |
| 1596 | |
| 1597 | debug_f("socket %u (fd=%d) type %d", socknum, e->fd, type)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1597, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "socket %u (fd=%d) type %d" , socknum, e->fd, type); |
| 1598 | |
| 1599 | /* check whether agent is locked */ |
| 1600 | if (locked && type != SSH_AGENTC_UNLOCK23) { |
| 1601 | sshbuf_reset(e->request); |
| 1602 | switch (type) { |
| 1603 | case SSH2_AGENTC_REQUEST_IDENTITIES11: |
| 1604 | /* send empty lists */ |
| 1605 | no_identities(e); |
| 1606 | break; |
| 1607 | default: |
| 1608 | /* send a fail message for all other request types */ |
| 1609 | send_status(e, 0); |
| 1610 | } |
| 1611 | return 1; |
| 1612 | } |
| 1613 | |
| 1614 | switch (type) { |
| 1615 | case SSH_AGENTC_LOCK22: |
| 1616 | case SSH_AGENTC_UNLOCK23: |
| 1617 | process_lock_agent(e, type == SSH_AGENTC_LOCK22); |
| 1618 | break; |
| 1619 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES9: |
| 1620 | process_remove_all_identities(e); /* safe for !WITH_SSH1 */ |
| 1621 | break; |
| 1622 | /* ssh2 */ |
| 1623 | case SSH2_AGENTC_SIGN_REQUEST13: |
| 1624 | process_sign_request2(e); |
| 1625 | break; |
| 1626 | case SSH2_AGENTC_REQUEST_IDENTITIES11: |
| 1627 | process_request_identities(e); |
| 1628 | break; |
| 1629 | case SSH2_AGENTC_ADD_IDENTITY17: |
| 1630 | case SSH2_AGENTC_ADD_ID_CONSTRAINED25: |
| 1631 | process_add_identity(e); |
| 1632 | break; |
| 1633 | case SSH2_AGENTC_REMOVE_IDENTITY18: |
| 1634 | process_remove_identity(e); |
| 1635 | break; |
| 1636 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES19: |
| 1637 | process_remove_all_identities(e); |
| 1638 | break; |
| 1639 | #ifdef ENABLE_PKCS111 |
| 1640 | case SSH_AGENTC_ADD_SMARTCARD_KEY20: |
| 1641 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED26: |
| 1642 | process_add_smartcard_key(e); |
| 1643 | break; |
| 1644 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY21: |
| 1645 | process_remove_smartcard_key(e); |
| 1646 | break; |
| 1647 | #endif /* ENABLE_PKCS11 */ |
| 1648 | case SSH_AGENTC_EXTENSION27: |
| 1649 | process_extension(e); |
| 1650 | break; |
| 1651 | default: |
| 1652 | /* Unknown message. Respond with failure. */ |
| 1653 | error("Unknown message %d", type)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1653, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Unknown message %d" , type); |
| 1654 | sshbuf_reset(e->request); |
| 1655 | send_status(e, 0); |
| 1656 | break; |
| 1657 | } |
| 1658 | return 1; |
| 1659 | } |
| 1660 | |
| 1661 | static void |
| 1662 | new_socket(sock_type type, int fd) |
| 1663 | { |
| 1664 | u_int i, old_alloc, new_alloc; |
| 1665 | |
| 1666 | debug_f("type = %s", type == AUTH_CONNECTION ? "CONNECTION" :sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1667, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "type = %s", type == AUTH_CONNECTION ? "CONNECTION" : (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN")) |
| 1667 | (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN"))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1667, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "type = %s", type == AUTH_CONNECTION ? "CONNECTION" : (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN")); |
| 1668 | set_nonblock(fd); |
| 1669 | |
| 1670 | if (fd > max_fd) |
| 1671 | max_fd = fd; |
| 1672 | |
| 1673 | for (i = 0; i < sockets_alloc; i++) |
| 1674 | if (sockets[i].type == AUTH_UNUSED) { |
| 1675 | sockets[i].fd = fd; |
| 1676 | if ((sockets[i].input = sshbuf_new()) == NULL((void*)0) || |
| 1677 | (sockets[i].output = sshbuf_new()) == NULL((void*)0) || |
| 1678 | (sockets[i].request = sshbuf_new()) == NULL((void*)0)) |
| 1679 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1679, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
| 1680 | sockets[i].type = type; |
| 1681 | return; |
| 1682 | } |
| 1683 | old_alloc = sockets_alloc; |
| 1684 | new_alloc = sockets_alloc + 10; |
| 1685 | sockets = xrecallocarray(sockets, old_alloc, new_alloc, |
| 1686 | sizeof(sockets[0])); |
| 1687 | for (i = old_alloc; i < new_alloc; i++) |
| 1688 | sockets[i].type = AUTH_UNUSED; |
| 1689 | sockets_alloc = new_alloc; |
| 1690 | sockets[old_alloc].fd = fd; |
| 1691 | if ((sockets[old_alloc].input = sshbuf_new()) == NULL((void*)0) || |
| 1692 | (sockets[old_alloc].output = sshbuf_new()) == NULL((void*)0) || |
| 1693 | (sockets[old_alloc].request = sshbuf_new()) == NULL((void*)0)) |
| 1694 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1694, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
| 1695 | sockets[old_alloc].type = type; |
| 1696 | } |
| 1697 | |
| 1698 | static int |
| 1699 | handle_socket_read(u_int socknum) |
| 1700 | { |
| 1701 | struct sockaddr_un sunaddr; |
| 1702 | socklen_t slen; |
| 1703 | uid_t euid; |
| 1704 | gid_t egid; |
| 1705 | int fd; |
| 1706 | |
| 1707 | slen = sizeof(sunaddr); |
| 1708 | fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen); |
| 1709 | if (fd == -1) { |
| 1710 | error("accept from AUTH_SOCKET: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1710, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "accept from AUTH_SOCKET: %s" , strerror((*__errno()))); |
| 1711 | return -1; |
| 1712 | } |
| 1713 | if (getpeereid(fd, &euid, &egid) == -1) { |
| 1714 | error("getpeereid %d failed: %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1714, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "getpeereid %d failed: %s" , fd, strerror((*__errno()))); |
| 1715 | close(fd); |
| 1716 | return -1; |
| 1717 | } |
| 1718 | if ((euid != 0) && (getuid() != euid)) { |
| 1719 | error("uid mismatch: peer euid %u != uid %u",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1720, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "uid mismatch: peer euid %u != uid %u" , (u_int) euid, (u_int) getuid()) |
| 1720 | (u_int) euid, (u_int) getuid())sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1720, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "uid mismatch: peer euid %u != uid %u" , (u_int) euid, (u_int) getuid()); |
| 1721 | close(fd); |
| 1722 | return -1; |
| 1723 | } |
| 1724 | new_socket(AUTH_CONNECTION, fd); |
| 1725 | return 0; |
| 1726 | } |
| 1727 | |
| 1728 | static int |
| 1729 | handle_conn_read(u_int socknum) |
| 1730 | { |
| 1731 | char buf[AGENT_RBUF_LEN(4096)]; |
| 1732 | ssize_t len; |
| 1733 | int r; |
| 1734 | |
| 1735 | if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) { |
| 1736 | if (len == -1) { |
| 1737 | if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) |
| 1738 | return 0; |
| 1739 | error_f("read error on socket %u (fd %d): %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1740, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "read error on socket %u (fd %d): %s" , socknum, sockets[socknum].fd, strerror((*__errno()))) |
| 1740 | socknum, sockets[socknum].fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1740, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "read error on socket %u (fd %d): %s" , socknum, sockets[socknum].fd, strerror((*__errno()))); |
| 1741 | } |
| 1742 | return -1; |
| 1743 | } |
| 1744 | if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0) |
| 1745 | fatal_fr(r, "compose")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1745, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose"); |
| 1746 | explicit_bzero(buf, sizeof(buf)); |
| 1747 | for (;;) { |
| 1748 | if ((r = process_message(socknum)) == -1) |
| 1749 | return -1; |
| 1750 | else if (r == 0) |
| 1751 | break; |
| 1752 | } |
| 1753 | return 0; |
| 1754 | } |
| 1755 | |
| 1756 | static int |
| 1757 | handle_conn_write(u_int socknum) |
| 1758 | { |
| 1759 | ssize_t len; |
| 1760 | int r; |
| 1761 | |
| 1762 | if (sshbuf_len(sockets[socknum].output) == 0) |
| 1763 | return 0; /* shouldn't happen */ |
| 1764 | if ((len = write(sockets[socknum].fd, |
| 1765 | sshbuf_ptr(sockets[socknum].output), |
| 1766 | sshbuf_len(sockets[socknum].output))) <= 0) { |
| 1767 | if (len == -1) { |
| 1768 | if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) |
| 1769 | return 0; |
| 1770 | error_f("read error on socket %u (fd %d): %s",sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1771, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "read error on socket %u (fd %d): %s" , socknum, sockets[socknum].fd, strerror((*__errno()))) |
| 1771 | socknum, sockets[socknum].fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1771, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "read error on socket %u (fd %d): %s" , socknum, sockets[socknum].fd, strerror((*__errno()))); |
| 1772 | } |
| 1773 | return -1; |
| 1774 | } |
| 1775 | if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0) |
| 1776 | fatal_fr(r, "consume")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1776, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "consume"); |
| 1777 | return 0; |
| 1778 | } |
| 1779 | |
| 1780 | static void |
| 1781 | after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds) |
| 1782 | { |
| 1783 | size_t i; |
| 1784 | u_int socknum, activefds = npfd; |
| 1785 | |
| 1786 | for (i = 0; i < npfd; i++) { |
| 1787 | if (pfd[i].revents == 0) |
| 1788 | continue; |
| 1789 | /* Find sockets entry */ |
| 1790 | for (socknum = 0; socknum < sockets_alloc; socknum++) { |
| 1791 | if (sockets[socknum].type != AUTH_SOCKET && |
| 1792 | sockets[socknum].type != AUTH_CONNECTION) |
| 1793 | continue; |
| 1794 | if (pfd[i].fd == sockets[socknum].fd) |
| 1795 | break; |
| 1796 | } |
| 1797 | if (socknum >= sockets_alloc) { |
| 1798 | error_f("no socket for fd %d", pfd[i].fd)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1798, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "no socket for fd %d" , pfd[i].fd); |
| 1799 | continue; |
| 1800 | } |
| 1801 | /* Process events */ |
| 1802 | switch (sockets[socknum].type) { |
| 1803 | case AUTH_SOCKET: |
| 1804 | if ((pfd[i].revents & (POLLIN0x0001|POLLERR0x0008)) == 0) |
| 1805 | break; |
| 1806 | if (npfd > maxfds) { |
| 1807 | debug3("out of fds (active %u >= limit %u); "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1808, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "out of fds (active %u >= limit %u); " "skipping accept", activefds, maxfds) |
| 1808 | "skipping accept", activefds, maxfds)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1808, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "out of fds (active %u >= limit %u); " "skipping accept", activefds, maxfds); |
| 1809 | break; |
| 1810 | } |
| 1811 | if (handle_socket_read(socknum) == 0) |
| 1812 | activefds++; |
| 1813 | break; |
| 1814 | case AUTH_CONNECTION: |
| 1815 | if ((pfd[i].revents & (POLLIN0x0001|POLLHUP0x0010|POLLERR0x0008)) != 0 && |
| 1816 | handle_conn_read(socknum) != 0) |
| 1817 | goto close_sock; |
| 1818 | if ((pfd[i].revents & (POLLOUT0x0004|POLLHUP0x0010)) != 0 && |
| 1819 | handle_conn_write(socknum) != 0) { |
| 1820 | close_sock: |
| 1821 | if (activefds == 0) |
| 1822 | fatal("activefds == 0 at close_sock")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1822, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "activefds == 0 at close_sock" ); |
| 1823 | close_socket(&sockets[socknum]); |
| 1824 | activefds--; |
| 1825 | break; |
| 1826 | } |
| 1827 | break; |
| 1828 | default: |
| 1829 | break; |
| 1830 | } |
| 1831 | } |
| 1832 | } |
| 1833 | |
| 1834 | static int |
| 1835 | prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds) |
| 1836 | { |
| 1837 | struct pollfd *pfd = *pfdp; |
| 1838 | size_t i, j, npfd = 0; |
| 1839 | time_t deadline; |
| 1840 | int r; |
| 1841 | |
| 1842 | /* Count active sockets */ |
| 1843 | for (i = 0; i < sockets_alloc; i++) { |
| 1844 | switch (sockets[i].type) { |
| 1845 | case AUTH_SOCKET: |
| 1846 | case AUTH_CONNECTION: |
| 1847 | npfd++; |
| 1848 | break; |
| 1849 | case AUTH_UNUSED: |
| 1850 | break; |
| 1851 | default: |
| 1852 | fatal("Unknown socket type %d", sockets[i].type)sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1852, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unknown socket type %d" , sockets[i].type); |
| 1853 | break; |
| 1854 | } |
| 1855 | } |
| 1856 | if (npfd != *npfdp && |
| 1857 | (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL((void*)0)) |
| 1858 | fatal_f("recallocarray failed")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1858, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "recallocarray failed" ); |
| 1859 | *pfdp = pfd; |
| 1860 | *npfdp = npfd; |
| 1861 | |
| 1862 | for (i = j = 0; i < sockets_alloc; i++) { |
| 1863 | switch (sockets[i].type) { |
| 1864 | case AUTH_SOCKET: |
| 1865 | if (npfd > maxfds) { |
| 1866 | debug3("out of fds (active %zu >= limit %u); "sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1867, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "out of fds (active %zu >= limit %u); " "skipping arming listener", npfd, maxfds) |
| 1867 | "skipping arming listener", npfd, maxfds)sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1867, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "out of fds (active %zu >= limit %u); " "skipping arming listener", npfd, maxfds); |
| 1868 | break; |
| 1869 | } |
| 1870 | pfd[j].fd = sockets[i].fd; |
| 1871 | pfd[j].revents = 0; |
| 1872 | pfd[j].events = POLLIN0x0001; |
| 1873 | j++; |
| 1874 | break; |
| 1875 | case AUTH_CONNECTION: |
| 1876 | pfd[j].fd = sockets[i].fd; |
| 1877 | pfd[j].revents = 0; |
| 1878 | /* |
| 1879 | * Only prepare to read if we can handle a full-size |
| 1880 | * input read buffer and enqueue a max size reply.. |
| 1881 | */ |
| 1882 | if ((r = sshbuf_check_reserve(sockets[i].input, |
| 1883 | AGENT_RBUF_LEN(4096))) == 0 && |
| 1884 | (r = sshbuf_check_reserve(sockets[i].output, |
| 1885 | AGENT_MAX_LEN(256*1024))) == 0) |
| 1886 | pfd[j].events = POLLIN0x0001; |
| 1887 | else if (r != SSH_ERR_NO_BUFFER_SPACE-9) |
| 1888 | fatal_fr(r, "reserve")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1888, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reserve"); |
| 1889 | if (sshbuf_len(sockets[i].output) > 0) |
| 1890 | pfd[j].events |= POLLOUT0x0004; |
| 1891 | j++; |
| 1892 | break; |
| 1893 | default: |
| 1894 | break; |
| 1895 | } |
| 1896 | } |
| 1897 | deadline = reaper(); |
| 1898 | if (parent_alive_interval != 0) |
| 1899 | deadline = (deadline == 0) ? parent_alive_interval : |
| 1900 | MINIMUM(deadline, parent_alive_interval)(((deadline) < (parent_alive_interval)) ? (deadline) : (parent_alive_interval )); |
| 1901 | if (deadline == 0) { |
| 1902 | *timeoutp = -1; /* INFTIM */ |
| 1903 | } else { |
| 1904 | if (deadline > INT_MAX2147483647 / 1000) |
| 1905 | *timeoutp = INT_MAX2147483647 / 1000; |
| 1906 | else |
| 1907 | *timeoutp = deadline * 1000; |
| 1908 | } |
| 1909 | return (1); |
| 1910 | } |
| 1911 | |
| 1912 | static void |
| 1913 | cleanup_socket(void) |
| 1914 | { |
| 1915 | if (cleanup_pid != 0 && getpid() != cleanup_pid) |
| 1916 | return; |
| 1917 | debug_f("cleanup")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1917, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "cleanup"); |
| 1918 | if (socket_name[0]) |
| 1919 | unlink(socket_name); |
| 1920 | if (socket_dir[0]) |
| 1921 | rmdir(socket_dir); |
| 1922 | } |
| 1923 | |
| 1924 | void |
| 1925 | cleanup_exit(int i) |
| 1926 | { |
| 1927 | cleanup_socket(); |
| 1928 | _exit(i); |
| 1929 | } |
| 1930 | |
| 1931 | /*ARGSUSED*/ |
| 1932 | static void |
| 1933 | cleanup_handler(int sig) |
| 1934 | { |
| 1935 | cleanup_socket(); |
| 1936 | #ifdef ENABLE_PKCS111 |
| 1937 | pkcs11_terminate(); |
| 1938 | #endif |
| 1939 | _exit(2); |
| 1940 | } |
| 1941 | |
| 1942 | static void |
| 1943 | check_parent_exists(void) |
| 1944 | { |
| 1945 | /* |
| 1946 | * If our parent has exited then getppid() will return (pid_t)1, |
| 1947 | * so testing for that should be safe. |
| 1948 | */ |
| 1949 | if (parent_pid != -1 && getppid() != parent_pid) { |
| 1950 | /* printf("Parent has died - Authentication agent exiting.\n"); */ |
| 1951 | cleanup_socket(); |
| 1952 | _exit(2); |
| 1953 | } |
| 1954 | } |
| 1955 | |
| 1956 | static void |
| 1957 | usage(void) |
| 1958 | { |
| 1959 | fprintf(stderr(&__sF[2]), |
| 1960 | "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n" |
| 1961 | " [-P allowed_providers] [-t life]\n" |
| 1962 | " ssh-agent [-a bind_address] [-E fingerprint_hash] [-P allowed_providers]\n" |
| 1963 | " [-t life] command [arg ...]\n" |
| 1964 | " ssh-agent [-c | -s] -k\n"); |
| 1965 | exit(1); |
| 1966 | } |
| 1967 | |
| 1968 | int |
| 1969 | main(int ac, char **av) |
| 1970 | { |
| 1971 | int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0; |
| 1972 | int sock, ch, result, saved_errno; |
| 1973 | char *shell, *format, *pidstr, *agentsocket = NULL((void*)0); |
| 1974 | struct rlimit rlim; |
| 1975 | extern int optind; |
| 1976 | extern char *optarg; |
| 1977 | pid_t pid; |
| 1978 | char pidstrbuf[1 + 3 * sizeof pid]; |
| 1979 | size_t len; |
| 1980 | mode_t prev_mask; |
| 1981 | int timeout = -1; /* INFTIM */ |
| 1982 | struct pollfd *pfd = NULL((void*)0); |
| 1983 | size_t npfd = 0; |
| 1984 | u_int maxfds; |
| 1985 | |
| 1986 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 1987 | sanitise_stdfd(); |
| 1988 | |
| 1989 | /* drop */ |
| 1990 | setegid(getgid()); |
| 1991 | setgid(getgid()); |
The return value from the call to 'setgid' is not checked. If an error occurs in 'setgid', the following code may execute with unexpected privileges | |
| 1992 | |
| 1993 | if (getrlimit(RLIMIT_NOFILE8, &rlim) == -1) |
| 1994 | fatal("%s: getrlimit: %s", __progname, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 1994, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s: getrlimit: %s" , __progname, strerror((*__errno()))); |
| 1995 | |
| 1996 | #ifdef WITH_OPENSSL1 |
| 1997 | OpenSSL_add_all_algorithms()OPENSSL_add_all_algorithms_noconf(); |
| 1998 | #endif |
| 1999 | |
| 2000 | while ((ch = getopt(ac, av, "cDdksE:a:O:P:t:")) != -1) { |
| 2001 | switch (ch) { |
| 2002 | case 'E': |
| 2003 | fingerprint_hash = ssh_digest_alg_by_name(optarg); |
| 2004 | if (fingerprint_hash == -1) |
| 2005 | fatal("Invalid hash algorithm \"%s\"", optarg)sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2005, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Invalid hash algorithm \"%s\"" , optarg); |
| 2006 | break; |
| 2007 | case 'c': |
| 2008 | if (s_flag) |
| 2009 | usage(); |
| 2010 | c_flag++; |
| 2011 | break; |
| 2012 | case 'k': |
| 2013 | k_flag++; |
| 2014 | break; |
| 2015 | case 'O': |
| 2016 | if (strcmp(optarg, "no-restrict-websafe") == 0) |
| 2017 | restrict_websafe = 0; |
| 2018 | else |
| 2019 | fatal("Unknown -O option")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2019, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unknown -O option" ); |
| 2020 | break; |
| 2021 | case 'P': |
| 2022 | if (allowed_providers != NULL((void*)0)) |
| 2023 | fatal("-P option already specified")sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2023, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "-P option already specified" ); |
| 2024 | allowed_providers = xstrdup(optarg); |
| 2025 | break; |
| 2026 | case 's': |
| 2027 | if (c_flag) |
| 2028 | usage(); |
| 2029 | s_flag++; |
| 2030 | break; |
| 2031 | case 'd': |
| 2032 | if (d_flag || D_flag) |
| 2033 | usage(); |
| 2034 | d_flag++; |
| 2035 | break; |
| 2036 | case 'D': |
| 2037 | if (d_flag || D_flag) |
| 2038 | usage(); |
| 2039 | D_flag++; |
| 2040 | break; |
| 2041 | case 'a': |
| 2042 | agentsocket = optarg; |
| 2043 | break; |
| 2044 | case 't': |
| 2045 | if ((lifetime = convtime(optarg)) == -1) { |
| 2046 | fprintf(stderr(&__sF[2]), "Invalid lifetime\n"); |
| 2047 | usage(); |
| 2048 | } |
| 2049 | break; |
| 2050 | default: |
| 2051 | usage(); |
| 2052 | } |
| 2053 | } |
| 2054 | ac -= optind; |
| 2055 | av += optind; |
| 2056 | |
| 2057 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag)) |
| 2058 | usage(); |
| 2059 | |
| 2060 | if (allowed_providers == NULL((void*)0)) |
| 2061 | allowed_providers = xstrdup(DEFAULT_ALLOWED_PROVIDERS"/usr/lib*/*,/usr/local/lib*/*"); |
| 2062 | |
| 2063 | if (ac == 0 && !c_flag && !s_flag) { |
| 2064 | shell = getenv("SHELL"); |
| 2065 | if (shell != NULL((void*)0) && (len = strlen(shell)) > 2 && |
| 2066 | strncmp(shell + len - 3, "csh", 3) == 0) |
| 2067 | c_flag = 1; |
| 2068 | } |
| 2069 | if (k_flag) { |
| 2070 | const char *errstr = NULL((void*)0); |
| 2071 | |
| 2072 | pidstr = getenv(SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID"); |
| 2073 | if (pidstr == NULL((void*)0)) { |
| 2074 | fprintf(stderr(&__sF[2]), "%s not set, cannot kill agent\n", |
| 2075 | SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID"); |
| 2076 | exit(1); |
| 2077 | } |
| 2078 | pid = (int)strtonum(pidstr, 2, INT_MAX2147483647, &errstr); |
| 2079 | if (errstr) { |
| 2080 | fprintf(stderr(&__sF[2]), |
| 2081 | "%s=\"%s\", which is not a good PID: %s\n", |
| 2082 | SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID", pidstr, errstr); |
| 2083 | exit(1); |
| 2084 | } |
| 2085 | if (kill(pid, SIGTERM15) == -1) { |
| 2086 | perror("kill"); |
| 2087 | exit(1); |
| 2088 | } |
| 2089 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; |
| 2090 | printf(format, SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK"); |
| 2091 | printf(format, SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID"); |
| 2092 | printf("echo Agent pid %ld killed;\n", (long)pid); |
| 2093 | exit(0); |
| 2094 | } |
| 2095 | |
| 2096 | /* |
| 2097 | * Minimum file descriptors: |
| 2098 | * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) + |
| 2099 | * a few spare for libc / stack protectors / sanitisers, etc. |
| 2100 | */ |
| 2101 | #define SSH_AGENT_MIN_FDS(3+1+1+1+4) (3+1+1+1+4) |
| 2102 | if (rlim.rlim_cur < SSH_AGENT_MIN_FDS(3+1+1+1+4)) |
| 2103 | fatal("%s: file descriptor rlimit %lld too low (minimum %u)",sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2104, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s: file descriptor rlimit %lld too low (minimum %u)" , __progname, (long long)rlim.rlim_cur, (3+1+1+1+4)) |
| 2104 | __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS)sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2104, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s: file descriptor rlimit %lld too low (minimum %u)" , __progname, (long long)rlim.rlim_cur, (3+1+1+1+4)); |
| 2105 | maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS(3+1+1+1+4); |
| 2106 | |
| 2107 | parent_pid = getpid(); |
| 2108 | |
| 2109 | if (agentsocket == NULL((void*)0)) { |
| 2110 | /* Create private directory for agent socket */ |
| 2111 | mktemp_proto(socket_dir, sizeof(socket_dir)); |
| 2112 | if (mkdtemp(socket_dir) == NULL((void*)0)) { |
| 2113 | perror("mkdtemp: private socket dir"); |
| 2114 | exit(1); |
| 2115 | } |
| 2116 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
| 2117 | (long)parent_pid); |
| 2118 | } else { |
| 2119 | /* Try to use specified agent socket */ |
| 2120 | socket_dir[0] = '\0'; |
| 2121 | strlcpy(socket_name, agentsocket, sizeof socket_name); |
| 2122 | } |
| 2123 | |
| 2124 | /* |
| 2125 | * Create socket early so it will exist before command gets run from |
| 2126 | * the parent. |
| 2127 | */ |
| 2128 | prev_mask = umask(0177); |
| 2129 | sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG128, 0); |
| 2130 | if (sock < 0) { |
| 2131 | /* XXX - unix_listener() calls error() not perror() */ |
| 2132 | *socket_name = '\0'; /* Don't unlink any existing file */ |
| 2133 | cleanup_exit(1); |
| 2134 | } |
| 2135 | umask(prev_mask); |
| 2136 | |
| 2137 | /* |
| 2138 | * Fork, and have the parent execute the command, if any, or present |
| 2139 | * the socket data. The child continues as the authentication agent. |
| 2140 | */ |
| 2141 | if (D_flag || d_flag) { |
| 2142 | log_init(__progname, |
| 2143 | d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO, |
| 2144 | SYSLOG_FACILITY_AUTH, 1); |
| 2145 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
| 2146 | printf(format, SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK", socket_name, |
| 2147 | SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK"); |
| 2148 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
| 2149 | fflush(stdout(&__sF[1])); |
| 2150 | goto skip; |
| 2151 | } |
| 2152 | pid = fork(); |
| 2153 | if (pid == -1) { |
| 2154 | perror("fork"); |
| 2155 | cleanup_exit(1); |
| 2156 | } |
| 2157 | if (pid != 0) { /* Parent - execute the given command. */ |
| 2158 | close(sock); |
| 2159 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
| 2160 | if (ac == 0) { |
| 2161 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
| 2162 | printf(format, SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK", socket_name, |
| 2163 | SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK"); |
| 2164 | printf(format, SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID", pidstrbuf, |
| 2165 | SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID"); |
| 2166 | printf("echo Agent pid %ld;\n", (long)pid); |
| 2167 | exit(0); |
| 2168 | } |
| 2169 | if (setenv(SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK", socket_name, 1) == -1 || |
| 2170 | setenv(SSH_AGENTPID_ENV_NAME"SSH_AGENT_PID", pidstrbuf, 1) == -1) { |
| 2171 | perror("setenv"); |
| 2172 | exit(1); |
| 2173 | } |
| 2174 | execvp(av[0], av); |
| 2175 | perror(av[0]); |
| 2176 | exit(1); |
| 2177 | } |
| 2178 | /* child */ |
| 2179 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); |
| 2180 | |
| 2181 | if (setsid() == -1) { |
| 2182 | error("setsid: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2182, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "setsid: %s", strerror ((*__errno()))); |
| 2183 | cleanup_exit(1); |
| 2184 | } |
| 2185 | |
| 2186 | (void)chdir("/"); |
| 2187 | if (stdfd_devnull(1, 1, 1) == -1) |
| 2188 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2188, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "stdfd_devnull failed" ); |
| 2189 | |
| 2190 | /* deny core dumps, since memory contains unencrypted private keys */ |
| 2191 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 2192 | if (setrlimit(RLIMIT_CORE4, &rlim) == -1) { |
| 2193 | error("setrlimit RLIMIT_CORE: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2193, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "setrlimit RLIMIT_CORE: %s" , strerror((*__errno()))); |
| 2194 | cleanup_exit(1); |
| 2195 | } |
| 2196 | |
| 2197 | skip: |
| 2198 | |
| 2199 | cleanup_pid = getpid(); |
| 2200 | |
| 2201 | #ifdef ENABLE_PKCS111 |
| 2202 | pkcs11_init(0); |
| 2203 | #endif |
| 2204 | new_socket(AUTH_SOCKET, sock); |
| 2205 | if (ac > 0) |
| 2206 | parent_alive_interval = 10; |
| 2207 | idtab_init(); |
| 2208 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 2209 | ssh_signal(SIGINT2, (d_flag | D_flag) ? cleanup_handler : SIG_IGN(void (*)(int))1); |
| 2210 | ssh_signal(SIGHUP1, cleanup_handler); |
| 2211 | ssh_signal(SIGTERM15, cleanup_handler); |
| 2212 | |
| 2213 | if (pledge("stdio rpath cpath unix id proc exec", NULL((void*)0)) == -1) |
| 2214 | fatal("%s: pledge: %s", __progname, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2214, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s: pledge: %s", __progname , strerror((*__errno()))); |
| 2215 | |
| 2216 | while (1) { |
| 2217 | prepare_poll(&pfd, &npfd, &timeout, maxfds); |
| 2218 | result = poll(pfd, npfd, timeout); |
| 2219 | saved_errno = errno(*__errno()); |
| 2220 | if (parent_alive_interval != 0) |
| 2221 | check_parent_exists(); |
| 2222 | (void) reaper(); /* remove expired keys */ |
| 2223 | if (result == -1) { |
| 2224 | if (saved_errno == EINTR4) |
| 2225 | continue; |
| 2226 | fatal("poll: %s", strerror(saved_errno))sshfatal("/usr/src/usr.bin/ssh/ssh-agent/../ssh-agent.c", __func__ , 2226, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "poll: %s", strerror (saved_errno)); |
| 2227 | } else if (result > 0) |
| 2228 | after_poll(pfd, npfd, maxfds); |
| 2229 | } |
| 2230 | /* NOTREACHED */ |
| 2231 | } |