File: | src/usr.bin/ssh/ssh/../sshconnect2.c |
Warning: | line 2232, column 7 Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' |
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1 | /* $OpenBSD: sshconnect2.c,v 1.355 2022/01/06 22:06:51 djm Exp $ */ |
2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
4 | * Copyright (c) 2008 Damien Miller. All rights reserved. |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
9 | * 1. Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | */ |
26 | |
27 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/wait.h> |
30 | #include <sys/queue.h> |
31 | #include <sys/stat.h> |
32 | |
33 | #include <errno(*__errno()).h> |
34 | #include <fcntl.h> |
35 | #include <limits.h> |
36 | #include <netdb.h> |
37 | #include <stdio.h> |
38 | #include <string.h> |
39 | #include <stdarg.h> |
40 | #include <signal.h> |
41 | #include <pwd.h> |
42 | #include <unistd.h> |
43 | #include <vis.h> |
44 | |
45 | #include "xmalloc.h" |
46 | #include "ssh.h" |
47 | #include "ssh2.h" |
48 | #include "sshbuf.h" |
49 | #include "packet.h" |
50 | #include "compat.h" |
51 | #include "cipher.h" |
52 | #include "sshkey.h" |
53 | #include "kex.h" |
54 | #include "myproposal.h" |
55 | #include "sshconnect.h" |
56 | #include "authfile.h" |
57 | #include "dh.h" |
58 | #include "authfd.h" |
59 | #include "log.h" |
60 | #include "misc.h" |
61 | #include "readconf.h" |
62 | #include "match.h" |
63 | #include "dispatch.h" |
64 | #include "canohost.h" |
65 | #include "msg.h" |
66 | #include "pathnames.h" |
67 | #include "uidswap.h" |
68 | #include "hostfile.h" |
69 | #include "ssherr.h" |
70 | #include "utf8.h" |
71 | #include "ssh-sk.h" |
72 | #include "sk-api.h" |
73 | |
74 | #ifdef GSSAPI |
75 | #include "ssh-gss.h" |
76 | #endif |
77 | |
78 | /* import */ |
79 | extern char *client_version_string; |
80 | extern char *server_version_string; |
81 | extern Options options; |
82 | |
83 | /* |
84 | * SSH2 key exchange |
85 | */ |
86 | |
87 | static char *xxx_host; |
88 | static struct sockaddr *xxx_hostaddr; |
89 | static const struct ssh_conn_info *xxx_conn_info; |
90 | |
91 | static int |
92 | verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh) |
93 | { |
94 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey, |
95 | xxx_conn_info) == -1) |
96 | fatal("Host key verification failed.")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 96, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Host key verification failed." ); |
97 | return 0; |
98 | } |
99 | |
100 | /* Returns the first item from a comma-separated algorithm list */ |
101 | static char * |
102 | first_alg(const char *algs) |
103 | { |
104 | char *ret, *cp; |
105 | |
106 | ret = xstrdup(algs); |
107 | if ((cp = strchr(ret, ',')) != NULL((void*)0)) |
108 | *cp = '\0'; |
109 | return ret; |
110 | } |
111 | |
112 | static char * |
113 | order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port, |
114 | const struct ssh_conn_info *cinfo) |
115 | { |
116 | char *oavail = NULL((void*)0), *avail = NULL((void*)0), *first = NULL((void*)0), *last = NULL((void*)0); |
117 | char *alg = NULL((void*)0), *hostname = NULL((void*)0), *ret = NULL((void*)0), *best = NULL((void*)0); |
118 | size_t maxlen; |
119 | struct hostkeys *hostkeys = NULL((void*)0); |
120 | int ktype; |
121 | u_int i; |
122 | |
123 | /* Find all hostkeys for this hostname */ |
124 | get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL((void*)0)); |
125 | hostkeys = init_hostkeys(); |
126 | for (i = 0; i < options.num_user_hostfiles; i++) |
127 | load_hostkeys(hostkeys, hostname, options.user_hostfiles[i], 0); |
128 | for (i = 0; i < options.num_system_hostfiles; i++) { |
129 | load_hostkeys(hostkeys, hostname, |
130 | options.system_hostfiles[i], 0); |
131 | } |
132 | if (options.known_hosts_command != NULL((void*)0)) { |
133 | load_hostkeys_command(hostkeys, options.known_hosts_command, |
134 | "ORDER", cinfo, NULL((void*)0), host); |
135 | } |
136 | /* |
137 | * If a plain public key exists that matches the type of the best |
138 | * preference HostkeyAlgorithms, then use the whole list as is. |
139 | * Note that we ignore whether the best preference algorithm is a |
140 | * certificate type, as sshconnect.c will downgrade certs to |
141 | * plain keys if necessary. |
142 | */ |
143 | best = first_alg(options.hostkeyalgorithms); |
144 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
145 | sshkey_type_plain(sshkey_type_from_name(best)), |
146 | sshkey_ecdsa_nid_from_name(best), NULL((void*)0))) { |
147 | debug3_f("have matching best-preference key type %s, "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 148, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "have matching best-preference key type %s, " "using HostkeyAlgorithms verbatim", best) |
148 | "using HostkeyAlgorithms verbatim", best)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 148, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "have matching best-preference key type %s, " "using HostkeyAlgorithms verbatim", best); |
149 | ret = xstrdup(options.hostkeyalgorithms); |
150 | goto out; |
151 | } |
152 | |
153 | /* |
154 | * Otherwise, prefer the host key algorithms that match known keys |
155 | * while keeping the ordering of HostkeyAlgorithms as much as possible. |
156 | */ |
157 | oavail = avail = xstrdup(options.hostkeyalgorithms); |
158 | maxlen = strlen(avail) + 1; |
159 | first = xmalloc(maxlen); |
160 | last = xmalloc(maxlen); |
161 | *first = *last = '\0'; |
162 | |
163 | #define ALG_APPEND(to, from) \ |
164 | do { \ |
165 | if (*to != '\0') \ |
166 | strlcat(to, ",", maxlen); \ |
167 | strlcat(to, from, maxlen); \ |
168 | } while (0) |
169 | |
170 | while ((alg = strsep(&avail, ",")) && *alg != '\0') { |
171 | if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC) |
172 | fatal_f("unknown alg %s", alg)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 172, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "unknown alg %s", alg ); |
173 | /* |
174 | * If we have a @cert-authority marker in known_hosts then |
175 | * prefer all certificate algorithms. |
176 | */ |
177 | if (sshkey_type_is_cert(ktype) && |
178 | lookup_marker_in_hostkeys(hostkeys, MRK_CA)) { |
179 | ALG_APPEND(first, alg); |
180 | continue; |
181 | } |
182 | /* If the key appears in known_hosts then prefer it */ |
183 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
184 | sshkey_type_plain(ktype), |
185 | sshkey_ecdsa_nid_from_name(alg), NULL((void*)0))) { |
186 | ALG_APPEND(first, alg); |
187 | continue; |
188 | } |
189 | /* Otherwise, put it last */ |
190 | ALG_APPEND(last, alg); |
191 | } |
192 | #undef ALG_APPEND |
193 | xasprintf(&ret, "%s%s%s", first, |
194 | (*first == '\0' || *last == '\0') ? "" : ",", last); |
195 | if (*first != '\0') |
196 | debug3_f("prefer hostkeyalgs: %s", first)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 196, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "prefer hostkeyalgs: %s" , first); |
197 | else |
198 | debug3_f("no algorithms matched; accept original")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 198, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "no algorithms matched; accept original" ); |
199 | out: |
200 | free(best); |
201 | free(first); |
202 | free(last); |
203 | free(hostname); |
204 | free(oavail); |
205 | free_hostkeys(hostkeys); |
206 | |
207 | return ret; |
208 | } |
209 | |
210 | void |
211 | ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port, |
212 | const struct ssh_conn_info *cinfo) |
213 | { |
214 | char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT"curve25519-sha256," "curve25519-sha256@libssh.org," "ecdh-sha2-nistp256," "ecdh-sha2-nistp384," "ecdh-sha2-nistp521," "sntrup761x25519-sha512@openssh.com," "diffie-hellman-group-exchange-sha256," "diffie-hellman-group16-sha512," "diffie-hellman-group18-sha512," "diffie-hellman-group14-sha256" , "ssh-ed25519-cert-v01@openssh.com," "ecdsa-sha2-nistp256-cert-v01@openssh.com," "ecdsa-sha2-nistp384-cert-v01@openssh.com," "ecdsa-sha2-nistp521-cert-v01@openssh.com," "sk-ssh-ed25519-cert-v01@openssh.com," "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com," "rsa-sha2-512-cert-v01@openssh.com," "rsa-sha2-256-cert-v01@openssh.com," "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", "chacha20-poly1305@openssh.com," "aes128-ctr,aes192-ctr,aes256-ctr," "aes128-gcm@openssh.com,aes256-gcm@openssh.com" , "chacha20-poly1305@openssh.com," "aes128-ctr,aes192-ctr,aes256-ctr," "aes128-gcm@openssh.com,aes256-gcm@openssh.com", "umac-64-etm@openssh.com," "umac-128-etm@openssh.com," "hmac-sha2-256-etm@openssh.com," "hmac-sha2-512-etm@openssh.com," "hmac-sha1-etm@openssh.com," "umac-64@openssh.com," "umac-128@openssh.com," "hmac-sha2-256," "hmac-sha2-512," "hmac-sha1", "umac-64-etm@openssh.com," "umac-128-etm@openssh.com," "hmac-sha2-256-etm@openssh.com," "hmac-sha2-512-etm@openssh.com," "hmac-sha1-etm@openssh.com," "umac-64@openssh.com," "umac-128@openssh.com," "hmac-sha2-256," "hmac-sha2-512," "hmac-sha1", "none,zlib@openssh.com" , "none,zlib@openssh.com", "", "" }; |
215 | char *s, *all_key; |
216 | int r, use_known_hosts_order = 0; |
217 | |
218 | xxx_host = host; |
219 | xxx_hostaddr = hostaddr; |
220 | xxx_conn_info = cinfo; |
221 | |
222 | /* |
223 | * If the user has not specified HostkeyAlgorithms, or has only |
224 | * appended or removed algorithms from that list then prefer algorithms |
225 | * that are in the list that are supported by known_hosts keys. |
226 | */ |
227 | if (options.hostkeyalgorithms == NULL((void*)0) || |
228 | options.hostkeyalgorithms[0] == '-' || |
229 | options.hostkeyalgorithms[0] == '+') |
230 | use_known_hosts_order = 1; |
231 | |
232 | /* Expand or fill in HostkeyAlgorithms */ |
233 | all_key = sshkey_alg_list(0, 0, 1, ','); |
234 | if ((r = kex_assemble_names(&options.hostkeyalgorithms, |
235 | kex_default_pk_alg(), all_key)) != 0) |
236 | fatal_fr(r, "kex_assemble_namelist")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 236, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_assemble_namelist" ); |
237 | free(all_key); |
238 | |
239 | if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL((void*)0)) |
240 | fatal_f("kex_names_cat")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 240, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "kex_names_cat"); |
241 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(ssh, s); |
242 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
243 | compat_cipher_proposal(ssh, options.ciphers); |
244 | myproposal[PROPOSAL_ENC_ALGS_STOC] = |
245 | compat_cipher_proposal(ssh, options.ciphers); |
246 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
247 | myproposal[PROPOSAL_COMP_ALGS_STOC] = |
248 | (char *)compression_alg_list(options.compression); |
249 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
250 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
251 | if (use_known_hosts_order) { |
252 | /* Query known_hosts and prefer algorithms that appear there */ |
253 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
254 | compat_pkalg_proposal(ssh, |
255 | order_hostkeyalgs(host, hostaddr, port, cinfo)); |
256 | } else { |
257 | /* Use specified HostkeyAlgorithms exactly */ |
258 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
259 | compat_pkalg_proposal(ssh, options.hostkeyalgorithms); |
260 | } |
261 | |
262 | if (options.rekey_limit || options.rekey_interval) |
263 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
264 | options.rekey_interval); |
265 | |
266 | /* start key exchange */ |
267 | if ((r = kex_setup(ssh, myproposal)) != 0) |
268 | fatal_r(r, "kex_setup")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 268, 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_setup"); |
269 | #ifdef WITH_OPENSSL1 |
270 | ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; |
271 | ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; |
272 | ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; |
273 | ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; |
274 | ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; |
275 | ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
276 | ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
277 | ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; |
278 | #endif |
279 | ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; |
280 | ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client; |
281 | ssh->kex->verify_host_key=&verify_host_key_callback; |
282 | |
283 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done); |
284 | |
285 | /* remove ext-info from the KEX proposals for rekeying */ |
286 | myproposal[PROPOSAL_KEX_ALGS] = |
287 | compat_kex_proposal(ssh, options.kex_algorithms); |
288 | if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0) |
289 | fatal_r(r, "kex_prop2buf")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 289, 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_prop2buf"); |
290 | |
291 | #ifdef DEBUG_KEXDH |
292 | /* send 1st encrypted/maced/compressed message */ |
293 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 || |
294 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || |
295 | (r = sshpkt_send(ssh)) != 0 || |
296 | (r = ssh_packet_write_wait(ssh)) != 0) |
297 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 297, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
298 | #endif |
299 | } |
300 | |
301 | /* |
302 | * Authenticate user |
303 | */ |
304 | |
305 | typedef struct cauthctxt Authctxt; |
306 | typedef struct cauthmethod Authmethod; |
307 | typedef struct identity Identity; |
308 | typedef struct idlist Idlist; |
309 | |
310 | struct identity { |
311 | TAILQ_ENTRY(identity)struct { struct identity *tqe_next; struct identity **tqe_prev ; } next; |
312 | int agent_fd; /* >=0 if agent supports key */ |
313 | struct sshkey *key; /* public/private key */ |
314 | char *filename; /* comment for agent-only keys */ |
315 | int tried; |
316 | int isprivate; /* key points to the private key */ |
317 | int userprovided; |
318 | }; |
319 | TAILQ_HEAD(idlist, identity)struct idlist { struct identity *tqh_first; struct identity * *tqh_last; }; |
320 | |
321 | struct cauthctxt { |
322 | const char *server_user; |
323 | const char *local_user; |
324 | const char *host; |
325 | const char *service; |
326 | struct cauthmethod *method; |
327 | sig_atomic_t success; |
328 | char *authlist; |
329 | #ifdef GSSAPI |
330 | /* gssapi */ |
331 | gss_OID_set gss_supported_mechs; |
332 | u_int mech_tried; |
333 | #endif |
334 | /* pubkey */ |
335 | struct idlist keys; |
336 | int agent_fd; |
337 | /* hostbased */ |
338 | Sensitive *sensitive; |
339 | char *oktypes, *ktypes; |
340 | const char *active_ktype; |
341 | /* kbd-interactive */ |
342 | int info_req_seen; |
343 | int attempt_kbdint; |
344 | /* password */ |
345 | int attempt_passwd; |
346 | /* generic */ |
347 | void *methoddata; |
348 | }; |
349 | |
350 | struct cauthmethod { |
351 | char *name; /* string to compare against server's list */ |
352 | int (*userauth)(struct ssh *ssh); |
353 | void (*cleanup)(struct ssh *ssh); |
354 | int *enabled; /* flag in option struct that enables method */ |
355 | int *batch_flag; /* flag in option struct that disables method */ |
356 | }; |
357 | |
358 | static int input_userauth_service_accept(int, u_int32_t, struct ssh *); |
359 | static int input_userauth_ext_info(int, u_int32_t, struct ssh *); |
360 | static int input_userauth_success(int, u_int32_t, struct ssh *); |
361 | static int input_userauth_failure(int, u_int32_t, struct ssh *); |
362 | static int input_userauth_banner(int, u_int32_t, struct ssh *); |
363 | static int input_userauth_error(int, u_int32_t, struct ssh *); |
364 | static int input_userauth_info_req(int, u_int32_t, struct ssh *); |
365 | static int input_userauth_pk_ok(int, u_int32_t, struct ssh *); |
366 | static int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *); |
367 | |
368 | static int userauth_none(struct ssh *); |
369 | static int userauth_pubkey(struct ssh *); |
370 | static int userauth_passwd(struct ssh *); |
371 | static int userauth_kbdint(struct ssh *); |
372 | static int userauth_hostbased(struct ssh *); |
373 | |
374 | #ifdef GSSAPI |
375 | static int userauth_gssapi(struct ssh *); |
376 | static void userauth_gssapi_cleanup(struct ssh *); |
377 | static int input_gssapi_response(int type, u_int32_t, struct ssh *); |
378 | static int input_gssapi_token(int type, u_int32_t, struct ssh *); |
379 | static int input_gssapi_error(int, u_int32_t, struct ssh *); |
380 | static int input_gssapi_errtok(int, u_int32_t, struct ssh *); |
381 | #endif |
382 | |
383 | void userauth(struct ssh *, char *); |
384 | |
385 | static void pubkey_cleanup(struct ssh *); |
386 | static int sign_and_send_pubkey(struct ssh *ssh, Identity *); |
387 | static void pubkey_prepare(struct ssh *, Authctxt *); |
388 | static void pubkey_reset(Authctxt *); |
389 | static struct sshkey *load_identity_file(Identity *); |
390 | |
391 | static Authmethod *authmethod_get(char *authlist); |
392 | static Authmethod *authmethod_lookup(const char *name); |
393 | static char *authmethods_get(void); |
394 | |
395 | Authmethod authmethods[] = { |
396 | #ifdef GSSAPI |
397 | {"gssapi-with-mic", |
398 | userauth_gssapi, |
399 | userauth_gssapi_cleanup, |
400 | &options.gss_authentication, |
401 | NULL((void*)0)}, |
402 | #endif |
403 | {"hostbased", |
404 | userauth_hostbased, |
405 | NULL((void*)0), |
406 | &options.hostbased_authentication, |
407 | NULL((void*)0)}, |
408 | {"publickey", |
409 | userauth_pubkey, |
410 | NULL((void*)0), |
411 | &options.pubkey_authentication, |
412 | NULL((void*)0)}, |
413 | {"keyboard-interactive", |
414 | userauth_kbdint, |
415 | NULL((void*)0), |
416 | &options.kbd_interactive_authentication, |
417 | &options.batch_mode}, |
418 | {"password", |
419 | userauth_passwd, |
420 | NULL((void*)0), |
421 | &options.password_authentication, |
422 | &options.batch_mode}, |
423 | {"none", |
424 | userauth_none, |
425 | NULL((void*)0), |
426 | NULL((void*)0), |
427 | NULL((void*)0)}, |
428 | {NULL((void*)0), NULL((void*)0), NULL((void*)0), NULL((void*)0), NULL((void*)0)} |
429 | }; |
430 | |
431 | void |
432 | ssh_userauth2(struct ssh *ssh, const char *local_user, |
433 | const char *server_user, char *host, Sensitive *sensitive) |
434 | { |
435 | Authctxt authctxt; |
436 | int r; |
437 | |
438 | if (options.preferred_authentications == NULL((void*)0)) |
439 | options.preferred_authentications = authmethods_get(); |
440 | |
441 | /* setup authentication context */ |
442 | memset(&authctxt, 0, sizeof(authctxt)); |
443 | authctxt.server_user = server_user; |
444 | authctxt.local_user = local_user; |
445 | authctxt.host = host; |
446 | authctxt.service = "ssh-connection"; /* service name */ |
447 | authctxt.success = 0; |
448 | authctxt.method = authmethod_lookup("none"); |
449 | authctxt.authlist = NULL((void*)0); |
450 | authctxt.methoddata = NULL((void*)0); |
451 | authctxt.sensitive = sensitive; |
452 | authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL((void*)0); |
453 | authctxt.info_req_seen = 0; |
454 | authctxt.attempt_kbdint = 0; |
455 | authctxt.attempt_passwd = 0; |
456 | #if GSSAPI |
457 | authctxt.gss_supported_mechs = NULL((void*)0); |
458 | authctxt.mech_tried = 0; |
459 | #endif |
460 | authctxt.agent_fd = -1; |
461 | pubkey_prepare(ssh, &authctxt); |
462 | if (authctxt.method == NULL((void*)0)) { |
463 | fatal_f("internal error: cannot send userauth none request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 463, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "internal error: cannot send userauth none request" ); |
464 | } |
465 | |
466 | if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST5)) != 0 || |
467 | (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 || |
468 | (r = sshpkt_send(ssh)) != 0) |
469 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 469, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
470 | |
471 | ssh->authctxt = &authctxt; |
472 | ssh_dispatch_init(ssh, &input_userauth_error); |
473 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO7, &input_userauth_ext_info); |
474 | ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT6, &input_userauth_service_accept); |
475 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */ |
476 | pubkey_cleanup(ssh); |
477 | ssh->authctxt = NULL((void*)0); |
478 | |
479 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN50, SSH2_MSG_USERAUTH_MAX79, NULL((void*)0)); |
480 | |
481 | if (!authctxt.success) |
482 | fatal("Authentication failed.")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 482, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Authentication failed." ); |
483 | if (ssh_packet_connection_is_on_socket(ssh)) { |
484 | verbose("Authenticated to %s ([%s]:%d) using \"%s\".", host,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 486, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name) |
485 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 486, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name) |
486 | authctxt.method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 486, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name); |
487 | } else { |
488 | verbose("Authenticated to %s (via proxy) using \"%s\".", host,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 489, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated to %s (via proxy) using \"%s\"." , host, authctxt.method->name) |
489 | authctxt.method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 489, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated to %s (via proxy) using \"%s\"." , host, authctxt.method->name); |
490 | } |
491 | } |
492 | |
493 | /* ARGSUSED */ |
494 | static int |
495 | input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh) |
496 | { |
497 | int r; |
498 | |
499 | if (ssh_packet_remaining(ssh) > 0) { |
500 | char *reply; |
501 | |
502 | if ((r = sshpkt_get_cstring(ssh, &reply, NULL((void*)0))) != 0) |
503 | goto out; |
504 | debug2("service_accept: %s", reply)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 504, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "service_accept: %s" , reply); |
505 | free(reply); |
506 | } else { |
507 | debug2("buggy server: service_accept w/o service")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 507, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "buggy server: service_accept w/o service" ); |
508 | } |
509 | if ((r = sshpkt_get_end(ssh)) != 0) |
510 | goto out; |
511 | debug("SSH2_MSG_SERVICE_ACCEPT received")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 511, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "SSH2_MSG_SERVICE_ACCEPT received" ); |
512 | |
513 | /* initial userauth request */ |
514 | userauth_none(ssh); |
515 | |
516 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO7, &input_userauth_error); |
517 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS52, &input_userauth_success); |
518 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE51, &input_userauth_failure); |
519 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER53, &input_userauth_banner); |
520 | r = 0; |
521 | out: |
522 | return r; |
523 | } |
524 | |
525 | /* ARGSUSED */ |
526 | static int |
527 | input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh) |
528 | { |
529 | return kex_input_ext_info(type, seqnr, ssh); |
530 | } |
531 | |
532 | void |
533 | userauth(struct ssh *ssh, char *authlist) |
534 | { |
535 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
536 | |
537 | if (authctxt->method != NULL((void*)0) && authctxt->method->cleanup != NULL((void*)0)) |
538 | authctxt->method->cleanup(ssh); |
539 | |
540 | free(authctxt->methoddata); |
541 | authctxt->methoddata = NULL((void*)0); |
542 | if (authlist == NULL((void*)0)) { |
543 | authlist = authctxt->authlist; |
544 | } else { |
545 | free(authctxt->authlist); |
546 | authctxt->authlist = authlist; |
547 | } |
548 | for (;;) { |
549 | Authmethod *method = authmethod_get(authlist); |
550 | if (method == NULL((void*)0)) |
551 | fatal("%s@%s: Permission denied (%s).",sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 552, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s@%s: Permission denied (%s)." , authctxt->server_user, authctxt->host, authlist) |
552 | authctxt->server_user, authctxt->host, authlist)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 552, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s@%s: Permission denied (%s)." , authctxt->server_user, authctxt->host, authlist); |
553 | authctxt->method = method; |
554 | |
555 | /* reset the per method handler */ |
556 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN60, |
557 | SSH2_MSG_USERAUTH_PER_METHOD_MAX79, NULL((void*)0)); |
558 | |
559 | /* and try new method */ |
560 | if (method->userauth(ssh) != 0) { |
561 | debug2("we sent a %s packet, wait for reply", method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 561, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "we sent a %s packet, wait for reply" , method->name); |
562 | break; |
563 | } else { |
564 | debug2("we did not send a packet, disable method")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 564, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "we did not send a packet, disable method" ); |
565 | method->enabled = NULL((void*)0); |
566 | } |
567 | } |
568 | } |
569 | |
570 | /* ARGSUSED */ |
571 | static int |
572 | input_userauth_error(int type, u_int32_t seq, struct ssh *ssh) |
573 | { |
574 | fatal_f("bad message during authentication: type %d", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 574, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "bad message during authentication: type %d" , type); |
575 | return 0; |
576 | } |
577 | |
578 | /* ARGSUSED */ |
579 | static int |
580 | input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh) |
581 | { |
582 | char *msg = NULL((void*)0); |
583 | size_t len; |
584 | int r; |
585 | |
586 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 586, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
587 | if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 || |
588 | (r = sshpkt_get_cstring(ssh, NULL((void*)0), NULL((void*)0))) != 0) |
589 | goto out; |
590 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) |
591 | fmprintf(stderr(&__sF[2]), "%s", msg); |
592 | r = 0; |
593 | out: |
594 | free(msg); |
595 | return r; |
596 | } |
597 | |
598 | /* ARGSUSED */ |
599 | static int |
600 | input_userauth_success(int type, u_int32_t seq, struct ssh *ssh) |
601 | { |
602 | Authctxt *authctxt = ssh->authctxt; |
603 | |
604 | if (authctxt == NULL((void*)0)) |
605 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 605, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no authentication context" ); |
606 | free(authctxt->authlist); |
607 | authctxt->authlist = NULL((void*)0); |
608 | if (authctxt->method != NULL((void*)0) && authctxt->method->cleanup != NULL((void*)0)) |
609 | authctxt->method->cleanup(ssh); |
610 | free(authctxt->methoddata); |
611 | authctxt->methoddata = NULL((void*)0); |
612 | authctxt->success = 1; /* break out */ |
613 | return 0; |
614 | } |
615 | |
616 | #if 0 |
617 | static int |
618 | input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh) |
619 | { |
620 | Authctxt *authctxt = ssh->authctxt; |
621 | |
622 | if (authctxt == NULL((void*)0)) |
623 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 623, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no authentication context" ); |
624 | |
625 | fatal("Unexpected authentication success during %s.",sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 626, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unexpected authentication success during %s." , authctxt->method->name) |
626 | authctxt->method->name)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 626, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unexpected authentication success during %s." , authctxt->method->name); |
627 | return 0; |
628 | } |
629 | #endif |
630 | |
631 | /* ARGSUSED */ |
632 | static int |
633 | input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh) |
634 | { |
635 | Authctxt *authctxt = ssh->authctxt; |
636 | char *authlist = NULL((void*)0); |
637 | u_char partial; |
638 | |
639 | if (authctxt == NULL((void*)0)) |
640 | fatal("input_userauth_failure: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 640, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_userauth_failure: no authentication context" ); |
641 | |
642 | if (sshpkt_get_cstring(ssh, &authlist, NULL((void*)0)) != 0 || |
643 | sshpkt_get_u8(ssh, &partial) != 0 || |
644 | sshpkt_get_end(ssh) != 0) |
645 | goto out; |
646 | |
647 | if (partial != 0) { |
648 | verbose("Authenticated using \"%s\" with partial success.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 649, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated using \"%s\" with partial success." , authctxt->method->name) |
649 | authctxt->method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 649, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Authenticated using \"%s\" with partial success." , authctxt->method->name); |
650 | /* reset state */ |
651 | pubkey_reset(authctxt); |
652 | } |
653 | debug("Authentications that can continue: %s", authlist)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 653, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Authentications that can continue: %s" , authlist); |
654 | |
655 | userauth(ssh, authlist); |
656 | authlist = NULL((void*)0); |
657 | out: |
658 | free(authlist); |
659 | return 0; |
660 | } |
661 | |
662 | /* |
663 | * Format an identity for logging including filename, key type, fingerprint |
664 | * and location (agent, etc.). Caller must free. |
665 | */ |
666 | static char * |
667 | format_identity(Identity *id) |
668 | { |
669 | char *fp = NULL((void*)0), *ret = NULL((void*)0); |
670 | const char *note = ""; |
671 | |
672 | if (id->key != NULL((void*)0)) { |
673 | fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
674 | SSH_FP_DEFAULT); |
675 | } |
676 | if (id->key) { |
677 | if ((id->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
678 | note = " token"; |
679 | else if (sshkey_is_sk(id->key)) |
680 | note = " authenticator"; |
681 | } |
682 | xasprintf(&ret, "%s %s%s%s%s%s%s", |
683 | id->filename, |
684 | id->key ? sshkey_type(id->key) : "", id->key ? " " : "", |
685 | fp ? fp : "", |
686 | id->userprovided ? " explicit" : "", note, |
687 | id->agent_fd != -1 ? " agent" : ""); |
688 | free(fp); |
689 | return ret; |
690 | } |
691 | |
692 | /* ARGSUSED */ |
693 | static int |
694 | input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh) |
695 | { |
696 | Authctxt *authctxt = ssh->authctxt; |
697 | struct sshkey *key = NULL((void*)0); |
698 | Identity *id = NULL((void*)0); |
699 | int pktype, found = 0, sent = 0; |
700 | size_t blen; |
701 | char *pkalg = NULL((void*)0), *fp = NULL((void*)0), *ident = NULL((void*)0); |
702 | u_char *pkblob = NULL((void*)0); |
703 | int r; |
704 | |
705 | if (authctxt == NULL((void*)0)) |
706 | fatal("input_userauth_pk_ok: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 706, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_userauth_pk_ok: no authentication context" ); |
707 | |
708 | if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL((void*)0))) != 0 || |
709 | (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 || |
710 | (r = sshpkt_get_end(ssh)) != 0) |
711 | goto done; |
712 | |
713 | if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) { |
714 | debug_f("server sent unknown pkalg %s", pkalg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 714, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "server sent unknown pkalg %s" , pkalg); |
715 | goto done; |
716 | } |
717 | if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) { |
718 | debug_r(r, "no key from blob. pkalg %s", pkalg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 718, 0, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "no key from blob. pkalg %s" , pkalg); |
719 | goto done; |
720 | } |
721 | if (key->type != pktype) { |
722 | error("input_userauth_pk_ok: type mismatch "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 724, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ) |
723 | "for decoded key (received %d, expected %d)",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 724, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ) |
724 | key->type, pktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 724, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ); |
725 | goto done; |
726 | } |
727 | |
728 | /* |
729 | * search keys in the reverse order, because last candidate has been |
730 | * moved to the end of the queue. this also avoids confusion by |
731 | * duplicate keys |
732 | */ |
733 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next)for((id) = (*(((struct idlist *)((&authctxt->keys)-> tqh_last))->tqh_last)); (id) != ((void*)0); (id) = (*(((struct idlist *)((id)->next.tqe_prev))->tqh_last))) { |
734 | if (sshkey_equal(key, id->key)) { |
735 | found = 1; |
736 | break; |
737 | } |
738 | } |
739 | if (!found || id == NULL((void*)0)) { |
740 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
741 | SSH_FP_DEFAULT); |
742 | error_f("server replied with unknown key: %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 743, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "server replied with unknown key: %s %s" , sshkey_type(key), fp == ((void*)0) ? "<ERROR>" : fp) |
743 | sshkey_type(key), fp == NULL ? "<ERROR>" : fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 743, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "server replied with unknown key: %s %s" , sshkey_type(key), fp == ((void*)0) ? "<ERROR>" : fp); |
744 | goto done; |
745 | } |
746 | ident = format_identity(id); |
747 | debug("Server accepts key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 747, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Server accepts key: %s" , ident); |
748 | sent = sign_and_send_pubkey(ssh, id); |
749 | r = 0; |
750 | done: |
751 | sshkey_free(key); |
752 | free(ident); |
753 | free(fp); |
754 | free(pkalg); |
755 | free(pkblob); |
756 | |
757 | /* try another method if we did not send a packet */ |
758 | if (r == 0 && sent == 0) |
759 | userauth(ssh, NULL((void*)0)); |
760 | return r; |
761 | } |
762 | |
763 | #ifdef GSSAPI |
764 | static int |
765 | userauth_gssapi(struct ssh *ssh) |
766 | { |
767 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
768 | Gssctxt *gssctxt = NULL((void*)0); |
769 | OM_uint32 min; |
770 | int r, ok = 0; |
771 | gss_OID mech = NULL((void*)0); |
772 | |
773 | /* Try one GSSAPI method at a time, rather than sending them all at |
774 | * once. */ |
775 | |
776 | if (authctxt->gss_supported_mechs == NULL((void*)0)) |
777 | gss_indicate_mechs(&min, &authctxt->gss_supported_mechs); |
778 | |
779 | /* Check to see whether the mechanism is usable before we offer it */ |
780 | while (authctxt->mech_tried < authctxt->gss_supported_mechs->count && |
781 | !ok) { |
782 | mech = &authctxt->gss_supported_mechs-> |
783 | elements[authctxt->mech_tried]; |
784 | /* My DER encoding requires length<128 */ |
785 | if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt, |
786 | mech, authctxt->host)) { |
787 | ok = 1; /* Mechanism works */ |
788 | } else { |
789 | authctxt->mech_tried++; |
790 | } |
791 | } |
792 | |
793 | if (!ok || mech == NULL((void*)0)) |
794 | return 0; |
795 | |
796 | authctxt->methoddata=(void *)gssctxt; |
797 | |
798 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
799 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
800 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
801 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
802 | (r = sshpkt_put_u32(ssh, 1)) != 0 || |
803 | (r = sshpkt_put_u32(ssh, (mech->length) + 2)) != 0 || |
804 | (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 || |
805 | (r = sshpkt_put_u8(ssh, mech->length)) != 0 || |
806 | (r = sshpkt_put(ssh, mech->elements, mech->length)) != 0 || |
807 | (r = sshpkt_send(ssh)) != 0) |
808 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 808, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
809 | |
810 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
811 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
812 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
813 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
814 | |
815 | authctxt->mech_tried++; /* Move along to next candidate */ |
816 | |
817 | return 1; |
818 | } |
819 | |
820 | static void |
821 | userauth_gssapi_cleanup(struct ssh *ssh) |
822 | { |
823 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
824 | Gssctxt *gssctxt = (Gssctxt *)authctxt->methoddata; |
825 | |
826 | ssh_gssapi_delete_ctx(&gssctxt); |
827 | authctxt->methoddata = NULL((void*)0); |
828 | |
829 | free(authctxt->gss_supported_mechs); |
830 | authctxt->gss_supported_mechs = NULL((void*)0); |
831 | } |
832 | |
833 | static OM_uint32 |
834 | process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok) |
835 | { |
836 | Authctxt *authctxt = ssh->authctxt; |
837 | Gssctxt *gssctxt = authctxt->methoddata; |
838 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
839 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
840 | gss_buffer_desc gssbuf; |
841 | OM_uint32 status, ms, flags; |
842 | int r; |
843 | |
844 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
845 | recv_tok, &send_tok, &flags); |
846 | |
847 | if (send_tok.length > 0) { |
848 | u_char type = GSS_ERROR(status) ? |
849 | SSH2_MSG_USERAUTH_GSSAPI_ERRTOK : |
850 | SSH2_MSG_USERAUTH_GSSAPI_TOKEN; |
851 | |
852 | if ((r = sshpkt_start(ssh, type)) != 0 || |
853 | (r = sshpkt_put_string(ssh, send_tok.value, |
854 | send_tok.length)) != 0 || |
855 | (r = sshpkt_send(ssh)) != 0) |
856 | fatal_fr(r, "send %u packet", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 856, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send %u packet", type ); |
857 | |
858 | gss_release_buffer(&ms, &send_tok); |
859 | } |
860 | |
861 | if (status == GSS_S_COMPLETE) { |
862 | /* send either complete or MIC, depending on mechanism */ |
863 | if (!(flags & GSS_C_INTEG_FLAG)) { |
864 | if ((r = sshpkt_start(ssh, |
865 | SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 || |
866 | (r = sshpkt_send(ssh)) != 0) |
867 | fatal_fr(r, "send completion")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 867, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send completion"); |
868 | } else { |
869 | struct sshbuf *b; |
870 | |
871 | if ((b = sshbuf_new()) == NULL((void*)0)) |
872 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 872, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
873 | ssh_gssapi_buildmic(b, authctxt->server_user, |
874 | authctxt->service, "gssapi-with-mic", |
875 | ssh->kex->session_id); |
876 | |
877 | if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL((void*)0)) |
878 | fatal_f("sshbuf_mutable_ptr failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 878, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_mutable_ptr failed" ); |
879 | gssbuf.length = sshbuf_len(b); |
880 | |
881 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
882 | |
883 | if (!GSS_ERROR(status)) { |
884 | if ((r = sshpkt_start(ssh, |
885 | SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 || |
886 | (r = sshpkt_put_string(ssh, mic.value, |
887 | mic.length)) != 0 || |
888 | (r = sshpkt_send(ssh)) != 0) |
889 | fatal_fr(r, "send MIC")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 889, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send MIC"); |
890 | } |
891 | |
892 | sshbuf_free(b); |
893 | gss_release_buffer(&ms, &mic); |
894 | } |
895 | } |
896 | |
897 | return status; |
898 | } |
899 | |
900 | /* ARGSUSED */ |
901 | static int |
902 | input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh) |
903 | { |
904 | Authctxt *authctxt = ssh->authctxt; |
905 | Gssctxt *gssctxt; |
906 | size_t oidlen; |
907 | u_char *oidv = NULL((void*)0); |
908 | int r; |
909 | |
910 | if (authctxt == NULL((void*)0)) |
911 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 911, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_gssapi_response: no authentication context" ); |
912 | gssctxt = authctxt->methoddata; |
913 | |
914 | /* Setup our OID */ |
915 | if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0) |
916 | goto done; |
917 | |
918 | if (oidlen <= 2 || |
919 | oidv[0] != SSH_GSS_OIDTYPE || |
920 | oidv[1] != oidlen - 2) { |
921 | debug("Badly encoded mechanism OID received")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 921, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Badly encoded mechanism OID received" ); |
922 | userauth(ssh, NULL((void*)0)); |
923 | goto ok; |
924 | } |
925 | |
926 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
927 | fatal("Server returned different OID than expected")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 927, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Server returned different OID than expected" ); |
928 | |
929 | if ((r = sshpkt_get_end(ssh)) != 0) |
930 | goto done; |
931 | |
932 | if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) { |
933 | /* Start again with next method on list */ |
934 | debug("Trying to start again")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 934, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Trying to start again" ); |
935 | userauth(ssh, NULL((void*)0)); |
936 | goto ok; |
937 | } |
938 | ok: |
939 | r = 0; |
940 | done: |
941 | free(oidv); |
942 | return r; |
943 | } |
944 | |
945 | /* ARGSUSED */ |
946 | static int |
947 | input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh) |
948 | { |
949 | Authctxt *authctxt = ssh->authctxt; |
950 | gss_buffer_desc recv_tok; |
951 | u_char *p = NULL((void*)0); |
952 | size_t len; |
953 | OM_uint32 status; |
954 | int r; |
955 | |
956 | if (authctxt == NULL((void*)0)) |
957 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 957, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_gssapi_response: no authentication context" ); |
958 | |
959 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
960 | (r = sshpkt_get_end(ssh)) != 0) |
961 | goto out; |
962 | |
963 | recv_tok.value = p; |
964 | recv_tok.length = len; |
965 | status = process_gssapi_token(ssh, &recv_tok); |
966 | |
967 | /* Start again with the next method in the list */ |
968 | if (GSS_ERROR(status)) { |
969 | userauth(ssh, NULL((void*)0)); |
970 | /* ok */ |
971 | } |
972 | r = 0; |
973 | out: |
974 | free(p); |
975 | return r; |
976 | } |
977 | |
978 | /* ARGSUSED */ |
979 | static int |
980 | input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh) |
981 | { |
982 | Authctxt *authctxt = ssh->authctxt; |
983 | Gssctxt *gssctxt; |
984 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
985 | gss_buffer_desc recv_tok; |
986 | OM_uint32 ms; |
987 | u_char *p = NULL((void*)0); |
988 | size_t len; |
989 | int r; |
990 | |
991 | if (authctxt == NULL((void*)0)) |
992 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 992, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_gssapi_response: no authentication context" ); |
993 | gssctxt = authctxt->methoddata; |
994 | |
995 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
996 | (r = sshpkt_get_end(ssh)) != 0) { |
997 | free(p); |
998 | return r; |
999 | } |
1000 | |
1001 | /* Stick it into GSSAPI and see what it says */ |
1002 | recv_tok.value = p; |
1003 | recv_tok.length = len; |
1004 | (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
1005 | &recv_tok, &send_tok, NULL((void*)0)); |
1006 | free(p); |
1007 | gss_release_buffer(&ms, &send_tok); |
1008 | |
1009 | /* Server will be returning a failed packet after this one */ |
1010 | return 0; |
1011 | } |
1012 | |
1013 | /* ARGSUSED */ |
1014 | static int |
1015 | input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh) |
1016 | { |
1017 | char *msg = NULL((void*)0); |
1018 | char *lang = NULL((void*)0); |
1019 | int r; |
1020 | |
1021 | if ((r = sshpkt_get_u32(ssh, NULL((void*)0))) != 0 || /* maj */ |
1022 | (r = sshpkt_get_u32(ssh, NULL((void*)0))) != 0 || /* min */ |
1023 | (r = sshpkt_get_cstring(ssh, &msg, NULL((void*)0))) != 0 || |
1024 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void*)0))) != 0) |
1025 | goto out; |
1026 | r = sshpkt_get_end(ssh); |
1027 | debug("Server GSSAPI Error:\n%s", msg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1027, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Server GSSAPI Error:\n%s" , msg); |
1028 | out: |
1029 | free(msg); |
1030 | free(lang); |
1031 | return r; |
1032 | } |
1033 | #endif /* GSSAPI */ |
1034 | |
1035 | static int |
1036 | userauth_none(struct ssh *ssh) |
1037 | { |
1038 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1039 | int r; |
1040 | |
1041 | /* initial userauth request */ |
1042 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1043 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
1044 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
1045 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
1046 | (r = sshpkt_send(ssh)) != 0) |
1047 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1047, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
1048 | return 1; |
1049 | } |
1050 | |
1051 | static int |
1052 | userauth_passwd(struct ssh *ssh) |
1053 | { |
1054 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1055 | char *password, *prompt = NULL((void*)0); |
1056 | const char *host = options.host_key_alias ? options.host_key_alias : |
1057 | authctxt->host; |
1058 | int r; |
1059 | |
1060 | if (authctxt->attempt_passwd++ >= options.number_of_password_prompts) |
1061 | return 0; |
1062 | |
1063 | if (authctxt->attempt_passwd != 1) |
1064 | error("Permission denied, please try again.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1064, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Permission denied, please try again." ); |
1065 | |
1066 | xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host); |
1067 | password = read_passphrase(prompt, 0); |
1068 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1069 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
1070 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
1071 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
1072 | (r = sshpkt_put_u8(ssh, 0)) != 0 || |
1073 | (r = sshpkt_put_cstring(ssh, password)) != 0 || |
1074 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
1075 | (r = sshpkt_send(ssh)) != 0) |
1076 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1076, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
1077 | |
1078 | free(prompt); |
1079 | if (password != NULL((void*)0)) |
1080 | freezero(password, strlen(password)); |
1081 | |
1082 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ60, |
1083 | &input_userauth_passwd_changereq); |
1084 | |
1085 | return 1; |
1086 | } |
1087 | |
1088 | /* |
1089 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
1090 | */ |
1091 | /* ARGSUSED */ |
1092 | static int |
1093 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh) |
1094 | { |
1095 | Authctxt *authctxt = ssh->authctxt; |
1096 | char *info = NULL((void*)0), *lang = NULL((void*)0), *password = NULL((void*)0), *retype = NULL((void*)0); |
1097 | char prompt[256]; |
1098 | const char *host; |
1099 | int r; |
1100 | |
1101 | debug2("input_userauth_passwd_changereq")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1101, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "input_userauth_passwd_changereq" ); |
1102 | |
1103 | if (authctxt == NULL((void*)0)) |
1104 | fatal("input_userauth_passwd_changereq: "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1105, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_userauth_passwd_changereq: " "no authentication context") |
1105 | "no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1105, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "input_userauth_passwd_changereq: " "no authentication context"); |
1106 | host = options.host_key_alias ? options.host_key_alias : authctxt->host; |
1107 | |
1108 | if ((r = sshpkt_get_cstring(ssh, &info, NULL((void*)0))) != 0 || |
1109 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void*)0))) != 0) |
1110 | goto out; |
1111 | if (strlen(info) > 0) |
1112 | logit("%s", info)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1112, 0, SYSLOG_LEVEL_INFO, ((void*)0), "%s", info); |
1113 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1114 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
1115 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
1116 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
1117 | (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */ |
1118 | goto out; |
1119 | |
1120 | snprintf(prompt, sizeof(prompt), |
1121 | "Enter %.30s@%.128s's old password: ", |
1122 | authctxt->server_user, host); |
1123 | password = read_passphrase(prompt, 0); |
1124 | if ((r = sshpkt_put_cstring(ssh, password)) != 0) |
1125 | goto out; |
1126 | |
1127 | freezero(password, strlen(password)); |
1128 | password = NULL((void*)0); |
1129 | while (password == NULL((void*)0)) { |
1130 | snprintf(prompt, sizeof(prompt), |
1131 | "Enter %.30s@%.128s's new password: ", |
1132 | authctxt->server_user, host); |
1133 | password = read_passphrase(prompt, RP_ALLOW_EOF0x0004); |
1134 | if (password == NULL((void*)0)) { |
1135 | /* bail out */ |
1136 | r = 0; |
1137 | goto out; |
1138 | } |
1139 | snprintf(prompt, sizeof(prompt), |
1140 | "Retype %.30s@%.128s's new password: ", |
1141 | authctxt->server_user, host); |
1142 | retype = read_passphrase(prompt, 0); |
1143 | if (strcmp(password, retype) != 0) { |
1144 | freezero(password, strlen(password)); |
1145 | logit("Mismatch; try again, EOF to quit.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1145, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Mismatch; try again, EOF to quit." ); |
1146 | password = NULL((void*)0); |
1147 | } |
1148 | freezero(retype, strlen(retype)); |
1149 | } |
1150 | if ((r = sshpkt_put_cstring(ssh, password)) != 0 || |
1151 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
1152 | (r = sshpkt_send(ssh)) != 0) |
1153 | goto out; |
1154 | |
1155 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ60, |
1156 | &input_userauth_passwd_changereq); |
1157 | r = 0; |
1158 | out: |
1159 | if (password) |
1160 | freezero(password, strlen(password)); |
1161 | free(info); |
1162 | free(lang); |
1163 | return r; |
1164 | } |
1165 | |
1166 | /* |
1167 | * Select an algorithm for publickey signatures. |
1168 | * Returns algorithm (caller must free) or NULL if no mutual algorithm found. |
1169 | * |
1170 | * Call with ssh==NULL to ignore server-sig-algs extension list and |
1171 | * only attempt with the key's base signature type. |
1172 | */ |
1173 | static char * |
1174 | key_sig_algorithm(struct ssh *ssh, const struct sshkey *key) |
1175 | { |
1176 | char *allowed, *oallowed, *cp, *tmp, *alg = NULL((void*)0); |
1177 | const char *server_sig_algs; |
1178 | |
1179 | /* |
1180 | * The signature algorithm will only differ from the key algorithm |
1181 | * for RSA keys/certs and when the server advertises support for |
1182 | * newer (SHA2) algorithms. |
1183 | */ |
1184 | if (ssh == NULL((void*)0) || ssh->kex->server_sig_algs == NULL((void*)0) || |
1185 | (key->type != KEY_RSA && key->type != KEY_RSA_CERT) || |
1186 | (key->type == KEY_RSA_CERT && (ssh->compat & SSH_BUG_SIGTYPE0x00000002))) { |
1187 | /* Filter base key signature alg against our configuration */ |
1188 | return match_list(sshkey_ssh_name(key), |
1189 | options.pubkey_accepted_algos, NULL((void*)0)); |
1190 | } |
1191 | |
1192 | /* |
1193 | * Workaround OpenSSH 7.4 bug: this version supports RSA/SHA-2 but |
1194 | * fails to advertise it via SSH2_MSG_EXT_INFO. |
1195 | */ |
1196 | server_sig_algs = ssh->kex->server_sig_algs; |
1197 | if (key->type == KEY_RSA && (ssh->compat & SSH_BUG_SIGTYPE740x00000004)) |
1198 | server_sig_algs = "rsa-sha2-256,rsa-sha2-512"; |
1199 | |
1200 | /* |
1201 | * For RSA keys/certs, since these might have a different sig type: |
1202 | * find the first entry in PubkeyAcceptedAlgorithms of the right type |
1203 | * that also appears in the supported signature algorithms list from |
1204 | * the server. |
1205 | */ |
1206 | oallowed = allowed = xstrdup(options.pubkey_accepted_algos); |
1207 | while ((cp = strsep(&allowed, ",")) != NULL((void*)0)) { |
1208 | if (sshkey_type_from_name(cp) != key->type) |
1209 | continue; |
1210 | tmp = match_list(sshkey_sigalg_by_name(cp), |
1211 | server_sig_algs, NULL((void*)0)); |
1212 | if (tmp != NULL((void*)0)) |
1213 | alg = xstrdup(cp); |
1214 | free(tmp); |
1215 | if (alg != NULL((void*)0)) |
1216 | break; |
1217 | } |
1218 | free(oallowed); |
1219 | return alg; |
1220 | } |
1221 | |
1222 | static int |
1223 | identity_sign(struct identity *id, u_char **sigp, size_t *lenp, |
1224 | const u_char *data, size_t datalen, u_int compat, const char *alg) |
1225 | { |
1226 | struct sshkey *sign_key = NULL((void*)0), *prv = NULL((void*)0); |
1227 | int retried = 0, r = SSH_ERR_INTERNAL_ERROR-1; |
1228 | struct notifier_ctx *notifier = NULL((void*)0); |
1229 | char *fp = NULL((void*)0), *pin = NULL((void*)0), *prompt = NULL((void*)0); |
1230 | |
1231 | *sigp = NULL((void*)0); |
1232 | *lenp = 0; |
1233 | |
1234 | /* The agent supports this key. */ |
1235 | if (id->key != NULL((void*)0) && id->agent_fd != -1) { |
1236 | return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp, |
1237 | data, datalen, alg, compat); |
1238 | } |
1239 | |
1240 | /* |
1241 | * We have already loaded the private key or the private key is |
1242 | * stored in external hardware. |
1243 | */ |
1244 | if (id->key != NULL((void*)0) && |
1245 | (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT0x0001))) { |
1246 | sign_key = id->key; |
1247 | } else { |
1248 | /* Load the private key from the file. */ |
1249 | if ((prv = load_identity_file(id)) == NULL((void*)0)) |
1250 | return SSH_ERR_KEY_NOT_FOUND-46; |
1251 | if (id->key != NULL((void*)0) && !sshkey_equal_public(prv, id->key)) { |
1252 | error_f("private key %s contents do not match public",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1253, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "private key %s contents do not match public" , id->filename) |
1253 | id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1253, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "private key %s contents do not match public" , id->filename); |
1254 | r = SSH_ERR_KEY_NOT_FOUND-46; |
1255 | goto out; |
1256 | } |
1257 | sign_key = prv; |
1258 | if (sshkey_is_sk(sign_key)) { |
1259 | if ((sign_key->sk_flags & |
1260 | SSH_SK_USER_VERIFICATION_REQD0x04)) { |
1261 | retry_pin: |
1262 | xasprintf(&prompt, "Enter PIN for %s key %s: ", |
1263 | sshkey_type(sign_key), id->filename); |
1264 | pin = read_passphrase(prompt, 0); |
1265 | } |
1266 | if ((sign_key->sk_flags & SSH_SK_USER_PRESENCE_REQD0x01)) { |
1267 | /* XXX should batch mode just skip these? */ |
1268 | if ((fp = sshkey_fingerprint(sign_key, |
1269 | options.fingerprint_hash, |
1270 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
1271 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1271, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "fingerprint failed" ); |
1272 | notifier = notify_start(options.batch_mode, |
1273 | "Confirm user presence for key %s %s", |
1274 | sshkey_type(sign_key), fp); |
1275 | free(fp); |
1276 | } |
1277 | } |
1278 | } |
1279 | if ((r = sshkey_sign(sign_key, sigp, lenp, data, datalen, |
1280 | alg, options.sk_provider, pin, compat)) != 0) { |
1281 | debug_fr(r, "sshkey_sign")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1281, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "sshkey_sign"); |
1282 | if (pin == NULL((void*)0) && !retried && sshkey_is_sk(sign_key) && |
1283 | r == SSH_ERR_KEY_WRONG_PASSPHRASE-43) { |
1284 | notify_complete(notifier, NULL((void*)0)); |
1285 | notifier = NULL((void*)0); |
1286 | retried = 1; |
1287 | goto retry_pin; |
1288 | } |
1289 | goto out; |
1290 | } |
1291 | |
1292 | /* |
1293 | * PKCS#11 tokens may not support all signature algorithms, |
1294 | * so check what we get back. |
1295 | */ |
1296 | if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0) { |
1297 | debug_fr(r, "sshkey_check_sigtype")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1297, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "sshkey_check_sigtype" ); |
1298 | goto out; |
1299 | } |
1300 | /* success */ |
1301 | r = 0; |
1302 | out: |
1303 | free(prompt); |
1304 | if (pin != NULL((void*)0)) |
1305 | freezero(pin, strlen(pin)); |
1306 | notify_complete(notifier, r == 0 ? "User presence confirmed" : NULL((void*)0)); |
1307 | sshkey_free(prv); |
1308 | return r; |
1309 | } |
1310 | |
1311 | static int |
1312 | id_filename_matches(Identity *id, Identity *private_id) |
1313 | { |
1314 | const char *suffixes[] = { ".pub", "-cert.pub", NULL((void*)0) }; |
1315 | size_t len = strlen(id->filename), plen = strlen(private_id->filename); |
1316 | size_t i, slen; |
1317 | |
1318 | if (strcmp(id->filename, private_id->filename) == 0) |
1319 | return 1; |
1320 | for (i = 0; suffixes[i]; i++) { |
1321 | slen = strlen(suffixes[i]); |
1322 | if (len > slen && plen == len - slen && |
1323 | strcmp(id->filename + (len - slen), suffixes[i]) == 0 && |
1324 | memcmp(id->filename, private_id->filename, plen) == 0) |
1325 | return 1; |
1326 | } |
1327 | return 0; |
1328 | } |
1329 | |
1330 | static int |
1331 | sign_and_send_pubkey(struct ssh *ssh, Identity *id) |
1332 | { |
1333 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1334 | struct sshbuf *b = NULL((void*)0); |
1335 | Identity *private_id, *sign_id = NULL((void*)0); |
1336 | u_char *signature = NULL((void*)0); |
1337 | size_t slen = 0, skip = 0; |
1338 | int r, fallback_sigtype, sent = 0; |
1339 | char *alg = NULL((void*)0), *fp = NULL((void*)0); |
1340 | const char *loc = "", *method = "publickey"; |
1341 | int hostbound = 0; |
1342 | |
1343 | /* prefer host-bound pubkey signatures if supported by server */ |
1344 | if ((ssh->kex->flags & KEX_HAS_PUBKEY_HOSTBOUND0x0004) != 0 && |
1345 | (options.pubkey_authentication & SSH_PUBKEY_AUTH_HBOUND0x02) != 0) { |
1346 | hostbound = 1; |
1347 | method = "publickey-hostbound-v00@openssh.com"; |
1348 | } |
1349 | |
1350 | if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
1351 | SSH_FP_DEFAULT)) == NULL((void*)0)) |
1352 | return 0; |
1353 | |
1354 | debug3_f("using %s with %s %s", method, sshkey_type(id->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1354, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "using %s with %s %s" , method, sshkey_type(id->key), fp); |
1355 | |
1356 | /* |
1357 | * If the key is an certificate, try to find a matching private key |
1358 | * and use it to complete the signature. |
1359 | * If no such private key exists, fall back to trying the certificate |
1360 | * key itself in case it has a private half already loaded. |
1361 | * This will try to set sign_id to the private key that will perform |
1362 | * the signature. |
1363 | */ |
1364 | if (sshkey_is_cert(id->key)) { |
1365 | TAILQ_FOREACH(private_id, &authctxt->keys, next)for((private_id) = ((&authctxt->keys)->tqh_first); ( private_id) != ((void*)0); (private_id) = ((private_id)->next .tqe_next)) { |
1366 | if (sshkey_equal_public(id->key, private_id->key) && |
1367 | id->key->type != private_id->key->type) { |
1368 | sign_id = private_id; |
1369 | break; |
1370 | } |
1371 | } |
1372 | /* |
1373 | * Exact key matches are preferred, but also allow |
1374 | * filename matches for non-PKCS#11/agent keys that |
1375 | * didn't load public keys. This supports the case |
1376 | * of keeping just a private key file and public |
1377 | * certificate on disk. |
1378 | */ |
1379 | if (sign_id == NULL((void*)0) && |
1380 | !id->isprivate && id->agent_fd == -1 && |
1381 | (id->key->flags & SSHKEY_FLAG_EXT0x0001) == 0) { |
1382 | TAILQ_FOREACH(private_id, &authctxt->keys, next)for((private_id) = ((&authctxt->keys)->tqh_first); ( private_id) != ((void*)0); (private_id) = ((private_id)->next .tqe_next)) { |
1383 | if (private_id->key == NULL((void*)0) && |
1384 | id_filename_matches(id, private_id)) { |
1385 | sign_id = private_id; |
1386 | break; |
1387 | } |
1388 | } |
1389 | } |
1390 | if (sign_id != NULL((void*)0)) { |
1391 | debug2_f("using private key \"%s\"%s for "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1393, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : "") |
1392 | "certificate", sign_id->filename,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1393, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : "") |
1393 | sign_id->agent_fd != -1 ? " from agent" : "")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1393, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : ""); |
1394 | } else { |
1395 | debug_f("no separate private key for certificate "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1396, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "no separate private key for certificate " "\"%s\"", id->filename) |
1396 | "\"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1396, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "no separate private key for certificate " "\"%s\"", id->filename); |
1397 | } |
1398 | } |
1399 | |
1400 | /* |
1401 | * If the above didn't select another identity to do the signing |
1402 | * then default to the one we started with. |
1403 | */ |
1404 | if (sign_id == NULL((void*)0)) |
1405 | sign_id = id; |
1406 | |
1407 | /* assemble and sign data */ |
1408 | for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) { |
1409 | free(alg); |
1410 | slen = 0; |
1411 | signature = NULL((void*)0); |
1412 | if ((alg = key_sig_algorithm(fallback_sigtype ? NULL((void*)0) : ssh, |
1413 | id->key)) == NULL((void*)0)) { |
1414 | error_f("no mutual signature supported")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1414, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "no mutual signature supported" ); |
1415 | goto out; |
1416 | } |
1417 | debug3_f("signing using %s %s", alg, fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1417, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "signing using %s %s" , alg, fp); |
1418 | |
1419 | sshbuf_free(b); |
1420 | if ((b = sshbuf_new()) == NULL((void*)0)) |
1421 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1421, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
1422 | if (ssh->compat & SSH_OLD_SESSIONID0x00000010) { |
1423 | if ((r = sshbuf_putb(b, ssh->kex->session_id)) != 0) |
1424 | fatal_fr(r, "sshbuf_putb")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1424, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putb"); |
1425 | } else { |
1426 | if ((r = sshbuf_put_stringb(b, |
1427 | ssh->kex->session_id)) != 0) |
1428 | fatal_fr(r, "sshbuf_put_stringb")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1428, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_stringb" ); |
1429 | } |
1430 | skip = sshbuf_len(b); |
1431 | if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1432 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
1433 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
1434 | (r = sshbuf_put_cstring(b, method)) != 0 || |
1435 | (r = sshbuf_put_u8(b, 1)) != 0 || |
1436 | (r = sshbuf_put_cstring(b, alg)) != 0 || |
1437 | (r = sshkey_puts(id->key, b)) != 0) { |
1438 | fatal_fr(r, "assemble signed data")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1438, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble signed data" ); |
1439 | } |
1440 | if (hostbound) { |
1441 | if (ssh->kex->initial_hostkey == NULL((void*)0)) { |
1442 | fatal_f("internal error: initial hostkey "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1443, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "internal error: initial hostkey " "not recorded") |
1443 | "not recorded")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1443, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "internal error: initial hostkey " "not recorded"); |
1444 | } |
1445 | if ((r = sshkey_puts(ssh->kex->initial_hostkey, b)) != 0) |
1446 | fatal_fr(r, "assemble %s hostkey", method)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1446, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble %s hostkey" , method); |
1447 | } |
1448 | /* generate signature */ |
1449 | r = identity_sign(sign_id, &signature, &slen, |
1450 | sshbuf_ptr(b), sshbuf_len(b), ssh->compat, alg); |
1451 | if (r == 0) |
1452 | break; |
1453 | else if (r == SSH_ERR_KEY_NOT_FOUND-46) |
1454 | goto out; /* soft failure */ |
1455 | else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED-58 && |
1456 | !fallback_sigtype) { |
1457 | if (sign_id->agent_fd != -1) |
1458 | loc = "agent "; |
1459 | else if ((sign_id->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
1460 | loc = "token "; |
1461 | logit("%skey %s %s returned incorrect signature type",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1462, 0, SYSLOG_LEVEL_INFO, ((void*)0), "%skey %s %s returned incorrect signature type" , loc, sshkey_type(id->key), fp) |
1462 | loc, sshkey_type(id->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1462, 0, SYSLOG_LEVEL_INFO, ((void*)0), "%skey %s %s returned incorrect signature type" , loc, sshkey_type(id->key), fp); |
1463 | continue; |
1464 | } |
1465 | error_fr(r, "signing failed for %s \"%s\"%s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1467, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : "") |
1466 | sshkey_type(sign_id->key), sign_id->filename,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1467, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : "") |
1467 | id->agent_fd != -1 ? " from agent" : "")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1467, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : ""); |
1468 | goto out; |
1469 | } |
1470 | if (slen == 0 || signature == NULL((void*)0)) /* shouldn't happen */ |
1471 | fatal_f("no signature")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1471, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no signature"); |
1472 | |
1473 | /* append signature */ |
1474 | if ((r = sshbuf_put_string(b, signature, slen)) != 0) |
1475 | fatal_fr(r, "append signature")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1475, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "append signature" ); |
1476 | |
1477 | #ifdef DEBUG_PK |
1478 | sshbuf_dump(b, stderr(&__sF[2])); |
1479 | #endif |
1480 | /* skip session id and packet type */ |
1481 | if ((r = sshbuf_consume(b, skip + 1)) != 0) |
1482 | fatal_fr(r, "consume")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1482, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "consume"); |
1483 | |
1484 | /* put remaining data from buffer into packet */ |
1485 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1486 | (r = sshpkt_putb(ssh, b)) != 0 || |
1487 | (r = sshpkt_send(ssh)) != 0) |
1488 | fatal_fr(r, "enqueue request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1488, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue request"); |
1489 | |
1490 | /* success */ |
1491 | sent = 1; |
1492 | |
1493 | out: |
1494 | free(fp); |
1495 | free(alg); |
1496 | sshbuf_free(b); |
1497 | freezero(signature, slen); |
1498 | return sent; |
1499 | } |
1500 | |
1501 | static int |
1502 | send_pubkey_test(struct ssh *ssh, Identity *id) |
1503 | { |
1504 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1505 | u_char *blob = NULL((void*)0); |
1506 | char *alg = NULL((void*)0); |
1507 | size_t bloblen; |
1508 | u_int have_sig = 0; |
1509 | int sent = 0, r; |
1510 | |
1511 | if ((alg = key_sig_algorithm(ssh, id->key)) == NULL((void*)0)) { |
1512 | debug_f("no mutual signature algorithm")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1512, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "no mutual signature algorithm" ); |
1513 | goto out; |
1514 | } |
1515 | |
1516 | if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) { |
1517 | /* we cannot handle this key */ |
1518 | debug3_f("cannot handle key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1518, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "cannot handle key" ); |
1519 | goto out; |
1520 | } |
1521 | /* register callback for USERAUTH_PK_OK message */ |
1522 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK60, &input_userauth_pk_ok); |
1523 | |
1524 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1525 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
1526 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
1527 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
1528 | (r = sshpkt_put_u8(ssh, have_sig)) != 0 || |
1529 | (r = sshpkt_put_cstring(ssh, alg)) != 0 || |
1530 | (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 || |
1531 | (r = sshpkt_send(ssh)) != 0) |
1532 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1532, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
1533 | sent = 1; |
1534 | |
1535 | out: |
1536 | free(alg); |
1537 | free(blob); |
1538 | return sent; |
1539 | } |
1540 | |
1541 | static struct sshkey * |
1542 | load_identity_file(Identity *id) |
1543 | { |
1544 | struct sshkey *private = NULL((void*)0); |
1545 | char prompt[300], *passphrase, *comment; |
1546 | int r, quit = 0, i; |
1547 | struct stat st; |
1548 | |
1549 | if (stat(id->filename, &st) == -1) { |
1550 | do_log2(id->userprovided ?sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1552, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void*)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))) |
1551 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1552, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void*)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))) |
1552 | "no such identity: %s: %s", id->filename, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1552, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void*)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))); |
1553 | return NULL((void*)0); |
1554 | } |
1555 | snprintf(prompt, sizeof prompt, |
1556 | "Enter passphrase for key '%.100s': ", id->filename); |
1557 | for (i = 0; i <= options.number_of_password_prompts; i++) { |
1558 | if (i == 0) |
1559 | passphrase = ""; |
1560 | else { |
1561 | passphrase = read_passphrase(prompt, 0); |
1562 | if (*passphrase == '\0') { |
1563 | debug2("no passphrase given, try next key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1563, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "no passphrase given, try next key" ); |
1564 | free(passphrase); |
1565 | break; |
1566 | } |
1567 | } |
1568 | switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename, |
1569 | passphrase, &private, &comment))) { |
1570 | case 0: |
1571 | break; |
1572 | case SSH_ERR_KEY_WRONG_PASSPHRASE-43: |
1573 | if (options.batch_mode) { |
1574 | quit = 1; |
1575 | break; |
1576 | } |
1577 | if (i != 0) |
1578 | debug2("bad passphrase given, try again...")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1578, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "bad passphrase given, try again..." ); |
1579 | break; |
1580 | case SSH_ERR_SYSTEM_ERROR-24: |
1581 | if (errno(*__errno()) == ENOENT2) { |
1582 | debug2_r(r, "Load key \"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1582, 0, SYSLOG_LEVEL_DEBUG2, ssh_err(r), "Load key \"%s\"", id->filename); |
1583 | quit = 1; |
1584 | break; |
1585 | } |
1586 | /* FALLTHROUGH */ |
1587 | default: |
1588 | error_r(r, "Load key \"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1588, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Load key \"%s\"", id ->filename); |
1589 | quit = 1; |
1590 | break; |
1591 | } |
1592 | if (private != NULL((void*)0) && sshkey_is_sk(private) && |
1593 | options.sk_provider == NULL((void*)0)) { |
1594 | debug("key \"%s\" is an authenticator-hosted key, "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1595, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "key \"%s\" is an authenticator-hosted key, " "but no provider specified", id->filename) |
1595 | "but no provider specified", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1595, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "key \"%s\" is an authenticator-hosted key, " "but no provider specified", id->filename); |
1596 | sshkey_free(private); |
1597 | private = NULL((void*)0); |
1598 | quit = 1; |
1599 | } |
1600 | if (!quit && private != NULL((void*)0) && id->agent_fd == -1 && |
1601 | !(id->key && id->isprivate)) |
1602 | maybe_add_key_to_agent(id->filename, private, comment, |
1603 | passphrase); |
1604 | if (i > 0) |
1605 | freezero(passphrase, strlen(passphrase)); |
1606 | free(comment); |
1607 | if (private != NULL((void*)0) || quit) |
1608 | break; |
1609 | } |
1610 | return private; |
1611 | } |
1612 | |
1613 | static int |
1614 | key_type_allowed_by_config(struct sshkey *key) |
1615 | { |
1616 | if (match_pattern_list(sshkey_ssh_name(key), |
1617 | options.pubkey_accepted_algos, 0) == 1) |
1618 | return 1; |
1619 | |
1620 | /* RSA keys/certs might be allowed by alternate signature types */ |
1621 | switch (key->type) { |
1622 | case KEY_RSA: |
1623 | if (match_pattern_list("rsa-sha2-512", |
1624 | options.pubkey_accepted_algos, 0) == 1) |
1625 | return 1; |
1626 | if (match_pattern_list("rsa-sha2-256", |
1627 | options.pubkey_accepted_algos, 0) == 1) |
1628 | return 1; |
1629 | break; |
1630 | case KEY_RSA_CERT: |
1631 | if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com", |
1632 | options.pubkey_accepted_algos, 0) == 1) |
1633 | return 1; |
1634 | if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com", |
1635 | options.pubkey_accepted_algos, 0) == 1) |
1636 | return 1; |
1637 | break; |
1638 | } |
1639 | return 0; |
1640 | } |
1641 | |
1642 | /* obtain a list of keys from the agent */ |
1643 | static int |
1644 | get_agent_identities(struct ssh *ssh, int *agent_fdp, |
1645 | struct ssh_identitylist **idlistp) |
1646 | { |
1647 | int r, agent_fd; |
1648 | struct ssh_identitylist *idlist; |
1649 | |
1650 | if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { |
1651 | if (r != SSH_ERR_AGENT_NOT_PRESENT-47) |
1652 | debug_fr(r, "ssh_get_authentication_socket")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1652, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ssh_get_authentication_socket" ); |
1653 | return r; |
1654 | } |
1655 | if ((r = ssh_agent_bind_hostkey(agent_fd, ssh->kex->initial_hostkey, |
1656 | ssh->kex->session_id, ssh->kex->initial_sig, 0)) == 0) |
1657 | debug_f("bound agent to hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1657, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "bound agent to hostkey" ); |
1658 | else |
1659 | debug2_fr(r, "ssh_agent_bind_hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1659, 1, SYSLOG_LEVEL_DEBUG2, ssh_err(r), "ssh_agent_bind_hostkey" ); |
1660 | |
1661 | if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) { |
1662 | debug_fr(r, "ssh_fetch_identitylist")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1662, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ssh_fetch_identitylist" ); |
1663 | close(agent_fd); |
1664 | return r; |
1665 | } |
1666 | /* success */ |
1667 | *agent_fdp = agent_fd; |
1668 | *idlistp = idlist; |
1669 | debug_f("agent returned %zu keys", idlist->nkeys)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1669, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "agent returned %zu keys" , idlist->nkeys); |
1670 | return 0; |
1671 | } |
1672 | |
1673 | /* |
1674 | * try keys in the following order: |
1675 | * 1. certificates listed in the config file |
1676 | * 2. other input certificates |
1677 | * 3. agent keys that are found in the config file |
1678 | * 4. other agent keys |
1679 | * 5. keys that are only listed in the config file |
1680 | */ |
1681 | static void |
1682 | pubkey_prepare(struct ssh *ssh, Authctxt *authctxt) |
1683 | { |
1684 | struct identity *id, *id2, *tmp; |
1685 | struct idlist agent, files, *preferred; |
1686 | struct sshkey *key; |
1687 | int agent_fd = -1, i, r, found; |
1688 | size_t j; |
1689 | struct ssh_identitylist *idlist; |
1690 | char *ident; |
1691 | |
1692 | TAILQ_INIT(&agent)do { (&agent)->tqh_first = ((void*)0); (&agent)-> tqh_last = &(&agent)->tqh_first; } while (0); /* keys from the agent */ |
1693 | TAILQ_INIT(&files)do { (&files)->tqh_first = ((void*)0); (&files)-> tqh_last = &(&files)->tqh_first; } while (0); /* keys from the config file */ |
1694 | preferred = &authctxt->keys; |
1695 | TAILQ_INIT(preferred)do { (preferred)->tqh_first = ((void*)0); (preferred)-> tqh_last = &(preferred)->tqh_first; } while (0); /* preferred order of keys */ |
1696 | |
1697 | /* list of keys stored in the filesystem and PKCS#11 */ |
1698 | for (i = 0; i < options.num_identity_files; i++) { |
1699 | key = options.identity_keys[i]; |
1700 | if (key && key->cert && |
1701 | key->cert->type != SSH2_CERT_TYPE_USER1) { |
1702 | debug_f("ignoring certificate %s: not a user "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1703, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]) |
1703 | "certificate", options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1703, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]); |
1704 | continue; |
1705 | } |
1706 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL((void*)0)) { |
1707 | debug_f("ignoring authenticator-hosted key %s as no "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1709, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]) |
1708 | "SecurityKeyProvider has been specified",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1709, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]) |
1709 | options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1709, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]); |
1710 | continue; |
1711 | } |
1712 | options.identity_keys[i] = NULL((void*)0); |
1713 | id = xcalloc(1, sizeof(*id)); |
1714 | id->agent_fd = -1; |
1715 | id->key = key; |
1716 | id->filename = xstrdup(options.identity_files[i]); |
1717 | id->userprovided = options.identity_file_userprovided[i]; |
1718 | TAILQ_INSERT_TAIL(&files, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (&files)->tqh_last; *(&files)->tqh_last = (id ); (&files)->tqh_last = &(id)->next.tqe_next; } while (0); |
1719 | } |
1720 | /* list of certificates specified by user */ |
1721 | for (i = 0; i < options.num_certificate_files; i++) { |
1722 | key = options.certificates[i]; |
1723 | if (!sshkey_is_cert(key) || key->cert == NULL((void*)0) || |
1724 | key->cert->type != SSH2_CERT_TYPE_USER1) { |
1725 | debug_f("ignoring certificate %s: not a user "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1726, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]) |
1726 | "certificate", options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1726, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]); |
1727 | continue; |
1728 | } |
1729 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL((void*)0)) { |
1730 | debug_f("ignoring authenticator-hosted key "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1733, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
1731 | "certificate %s as no "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1733, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
1732 | "SecurityKeyProvider has been specified",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1733, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
1733 | options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1733, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]); |
1734 | continue; |
1735 | } |
1736 | id = xcalloc(1, sizeof(*id)); |
1737 | id->agent_fd = -1; |
1738 | id->key = key; |
1739 | id->filename = xstrdup(options.certificate_files[i]); |
1740 | id->userprovided = options.certificate_file_userprovided[i]; |
1741 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
1742 | } |
1743 | /* list of keys supported by the agent */ |
1744 | if ((r = get_agent_identities(ssh, &agent_fd, &idlist)) == 0) { |
1745 | for (j = 0; j < idlist->nkeys; j++) { |
1746 | found = 0; |
1747 | TAILQ_FOREACH(id, &files, next)for((id) = ((&files)->tqh_first); (id) != ((void*)0); ( id) = ((id)->next.tqe_next)) { |
1748 | /* |
1749 | * agent keys from the config file are |
1750 | * preferred |
1751 | */ |
1752 | if (sshkey_equal(idlist->keys[j], id->key)) { |
1753 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1754 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
1755 | id->agent_fd = agent_fd; |
1756 | found = 1; |
1757 | break; |
1758 | } |
1759 | } |
1760 | if (!found && !options.identities_only) { |
1761 | id = xcalloc(1, sizeof(*id)); |
1762 | /* XXX "steals" key/comment from idlist */ |
1763 | id->key = idlist->keys[j]; |
1764 | id->filename = idlist->comments[j]; |
1765 | idlist->keys[j] = NULL((void*)0); |
1766 | idlist->comments[j] = NULL((void*)0); |
1767 | id->agent_fd = agent_fd; |
1768 | TAILQ_INSERT_TAIL(&agent, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (&agent)->tqh_last; *(&agent)->tqh_last = (id ); (&agent)->tqh_last = &(id)->next.tqe_next; } while (0); |
1769 | } |
1770 | } |
1771 | ssh_free_identitylist(idlist); |
1772 | /* append remaining agent keys */ |
1773 | TAILQ_CONCAT(preferred, &agent, next)do { if (!(((&agent)->tqh_first) == ((void*)0))) { *(preferred )->tqh_last = (&agent)->tqh_first; (&agent)-> tqh_first->next.tqe_prev = (preferred)->tqh_last; (preferred )->tqh_last = (&agent)->tqh_last; do { ((&agent ))->tqh_first = ((void*)0); ((&agent))->tqh_last = & ((&agent))->tqh_first; } while (0); } } while (0); |
1774 | authctxt->agent_fd = agent_fd; |
1775 | } |
1776 | /* Prefer PKCS11 keys that are explicitly listed */ |
1777 | TAILQ_FOREACH_SAFE(id, &files, next, tmp)for ((id) = ((&files)->tqh_first); (id) != ((void*)0) && ((tmp) = ((id)->next.tqe_next), 1); (id) = (tmp)) { |
1778 | if (id->key == NULL((void*)0) || (id->key->flags & SSHKEY_FLAG_EXT0x0001) == 0) |
1779 | continue; |
1780 | found = 0; |
1781 | TAILQ_FOREACH(id2, &files, next)for((id2) = ((&files)->tqh_first); (id2) != ((void*)0) ; (id2) = ((id2)->next.tqe_next)) { |
1782 | if (id2->key == NULL((void*)0) || |
1783 | (id2->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
1784 | continue; |
1785 | if (sshkey_equal(id->key, id2->key)) { |
1786 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1787 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
1788 | found = 1; |
1789 | break; |
1790 | } |
1791 | } |
1792 | /* If IdentitiesOnly set and key not found then don't use it */ |
1793 | if (!found && options.identities_only) { |
1794 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1795 | freezero(id, sizeof(*id)); |
1796 | } |
1797 | } |
1798 | /* append remaining keys from the config file */ |
1799 | TAILQ_CONCAT(preferred, &files, next)do { if (!(((&files)->tqh_first) == ((void*)0))) { *(preferred )->tqh_last = (&files)->tqh_first; (&files)-> tqh_first->next.tqe_prev = (preferred)->tqh_last; (preferred )->tqh_last = (&files)->tqh_last; do { ((&files ))->tqh_first = ((void*)0); ((&files))->tqh_last = & ((&files))->tqh_first; } while (0); } } while (0); |
1800 | /* finally, filter by PubkeyAcceptedAlgorithms */ |
1801 | TAILQ_FOREACH_SAFE(id, preferred, next, id2)for ((id) = ((preferred)->tqh_first); (id) != ((void*)0) && ((id2) = ((id)->next.tqe_next), 1); (id) = (id2)) { |
1802 | if (id->key != NULL((void*)0) && !key_type_allowed_by_config(id->key)) { |
1803 | debug("Skipping %s key %s - "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1805, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Skipping %s key %s - " "corresponding algo not in PubkeyAcceptedAlgorithms", sshkey_ssh_name (id->key), id->filename) |
1804 | "corresponding algo not in PubkeyAcceptedAlgorithms",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1805, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Skipping %s key %s - " "corresponding algo not in PubkeyAcceptedAlgorithms", sshkey_ssh_name (id->key), id->filename) |
1805 | sshkey_ssh_name(id->key), id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1805, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Skipping %s key %s - " "corresponding algo not in PubkeyAcceptedAlgorithms", sshkey_ssh_name (id->key), id->filename); |
1806 | TAILQ_REMOVE(preferred, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (preferred )->tqh_last = (id)->next.tqe_prev; *(id)->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1807 | sshkey_free(id->key); |
1808 | free(id->filename); |
1809 | memset(id, 0, sizeof(*id)); |
1810 | continue; |
1811 | } |
1812 | } |
1813 | /* List the keys we plan on using */ |
1814 | TAILQ_FOREACH_SAFE(id, preferred, next, id2)for ((id) = ((preferred)->tqh_first); (id) != ((void*)0) && ((id2) = ((id)->next.tqe_next), 1); (id) = (id2)) { |
1815 | ident = format_identity(id); |
1816 | debug("Will attempt key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1816, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Will attempt key: %s" , ident); |
1817 | free(ident); |
1818 | } |
1819 | debug2_f("done")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1819, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "done"); |
1820 | } |
1821 | |
1822 | static void |
1823 | pubkey_cleanup(struct ssh *ssh) |
1824 | { |
1825 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1826 | Identity *id; |
1827 | |
1828 | if (authctxt->agent_fd != -1) { |
1829 | ssh_close_authentication_socket(authctxt->agent_fd); |
1830 | authctxt->agent_fd = -1; |
1831 | } |
1832 | for (id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first); id; |
1833 | id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first)) { |
1834 | TAILQ_REMOVE(&authctxt->keys, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& authctxt->keys)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1835 | sshkey_free(id->key); |
1836 | free(id->filename); |
1837 | free(id); |
1838 | } |
1839 | } |
1840 | |
1841 | static void |
1842 | pubkey_reset(Authctxt *authctxt) |
1843 | { |
1844 | Identity *id; |
1845 | |
1846 | TAILQ_FOREACH(id, &authctxt->keys, next)for((id) = ((&authctxt->keys)->tqh_first); (id) != ( (void*)0); (id) = ((id)->next.tqe_next)) |
1847 | id->tried = 0; |
1848 | } |
1849 | |
1850 | static int |
1851 | try_identity(struct ssh *ssh, Identity *id) |
1852 | { |
1853 | if (!id->key) |
1854 | return (0); |
1855 | if (sshkey_type_plain(id->key->type) == KEY_RSA && |
1856 | (ssh->compat & SSH_BUG_RSASIGMD50x00002000) != 0) { |
1857 | debug("Skipped %s key %s for RSA/MD5 server",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1858, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Skipped %s key %s for RSA/MD5 server" , sshkey_type(id->key), id->filename) |
1858 | sshkey_type(id->key), id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1858, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Skipped %s key %s for RSA/MD5 server" , sshkey_type(id->key), id->filename); |
1859 | return (0); |
1860 | } |
1861 | return 1; |
1862 | } |
1863 | |
1864 | static int |
1865 | userauth_pubkey(struct ssh *ssh) |
1866 | { |
1867 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1868 | Identity *id; |
1869 | int sent = 0; |
1870 | char *ident; |
1871 | |
1872 | while ((id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first))) { |
1873 | if (id->tried++) |
1874 | return (0); |
1875 | /* move key to the end of the queue */ |
1876 | TAILQ_REMOVE(&authctxt->keys, id, next)do { if (((id)->next.tqe_next) != ((void*)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& authctxt->keys)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
1877 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next)do { (id)->next.tqe_next = ((void*)0); (id)->next.tqe_prev = (&authctxt->keys)->tqh_last; *(&authctxt-> keys)->tqh_last = (id); (&authctxt->keys)->tqh_last = &(id)->next.tqe_next; } while (0); |
1878 | /* |
1879 | * send a test message if we have the public key. for |
1880 | * encrypted keys we cannot do this and have to load the |
1881 | * private key instead |
1882 | */ |
1883 | if (id->key != NULL((void*)0)) { |
1884 | if (try_identity(ssh, id)) { |
1885 | ident = format_identity(id); |
1886 | debug("Offering public key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1886, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Offering public key: %s" , ident); |
1887 | free(ident); |
1888 | sent = send_pubkey_test(ssh, id); |
1889 | } |
1890 | } else { |
1891 | debug("Trying private key: %s", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1891, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Trying private key: %s" , id->filename); |
1892 | id->key = load_identity_file(id); |
1893 | if (id->key != NULL((void*)0)) { |
1894 | if (try_identity(ssh, id)) { |
1895 | id->isprivate = 1; |
1896 | sent = sign_and_send_pubkey(ssh, id); |
1897 | } |
1898 | sshkey_free(id->key); |
1899 | id->key = NULL((void*)0); |
1900 | id->isprivate = 0; |
1901 | } |
1902 | } |
1903 | if (sent) |
1904 | return (sent); |
1905 | } |
1906 | return (0); |
1907 | } |
1908 | |
1909 | /* |
1910 | * Send userauth request message specifying keyboard-interactive method. |
1911 | */ |
1912 | static int |
1913 | userauth_kbdint(struct ssh *ssh) |
1914 | { |
1915 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
1916 | int r; |
1917 | |
1918 | if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts) |
1919 | return 0; |
1920 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1921 | if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) { |
1922 | debug3("userauth_kbdint: disable: no info_req_seen")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1922, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "userauth_kbdint: disable: no info_req_seen" ); |
1923 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST60, NULL((void*)0)); |
1924 | return 0; |
1925 | } |
1926 | |
1927 | debug2("userauth_kbdint")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1927, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "userauth_kbdint"); |
1928 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
1929 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
1930 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
1931 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
1932 | (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */ |
1933 | (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ? |
1934 | options.kbd_interactive_devices : "")) != 0 || |
1935 | (r = sshpkt_send(ssh)) != 0) |
1936 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1936, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
1937 | |
1938 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST60, &input_userauth_info_req); |
1939 | return 1; |
1940 | } |
1941 | |
1942 | /* |
1943 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
1944 | */ |
1945 | static int |
1946 | input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh) |
1947 | { |
1948 | Authctxt *authctxt = ssh->authctxt; |
1949 | char *name = NULL((void*)0), *inst = NULL((void*)0), *lang = NULL((void*)0), *prompt = NULL((void*)0); |
1950 | char *display_prompt = NULL((void*)0), *response = NULL((void*)0); |
1951 | u_char echo = 0; |
1952 | u_int num_prompts, i; |
1953 | int r; |
1954 | |
1955 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1955, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "entering"); |
1956 | |
1957 | if (authctxt == NULL((void*)0)) |
1958 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1958, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no authentication context" ); |
1959 | |
1960 | authctxt->info_req_seen = 1; |
1961 | |
1962 | if ((r = sshpkt_get_cstring(ssh, &name, NULL((void*)0))) != 0 || |
1963 | (r = sshpkt_get_cstring(ssh, &inst, NULL((void*)0))) != 0 || |
1964 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void*)0))) != 0) |
1965 | goto out; |
1966 | if (strlen(name) > 0) |
1967 | logit("%s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1967, 0, SYSLOG_LEVEL_INFO, ((void*)0), "%s", name); |
1968 | if (strlen(inst) > 0) |
1969 | logit("%s", inst)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1969, 0, SYSLOG_LEVEL_INFO, ((void*)0), "%s", inst); |
1970 | |
1971 | if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0) |
1972 | goto out; |
1973 | /* |
1974 | * Begin to build info response packet based on prompts requested. |
1975 | * We commit to providing the correct number of responses, so if |
1976 | * further on we run into a problem that prevents this, we have to |
1977 | * be sure and clean this up and send a correct error response. |
1978 | */ |
1979 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE61)) != 0 || |
1980 | (r = sshpkt_put_u32(ssh, num_prompts)) != 0) |
1981 | goto out; |
1982 | |
1983 | debug2_f("num_prompts %d", num_prompts)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1983, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "num_prompts %d", num_prompts ); |
1984 | for (i = 0; i < num_prompts; i++) { |
1985 | if ((r = sshpkt_get_cstring(ssh, &prompt, NULL((void*)0))) != 0 || |
1986 | (r = sshpkt_get_u8(ssh, &echo)) != 0) |
1987 | goto out; |
1988 | if (asmprintf(&display_prompt, INT_MAX2147483647, NULL((void*)0), "(%s@%s) %s", |
1989 | authctxt->server_user, options.host_key_alias ? |
1990 | options.host_key_alias : authctxt->host, prompt) == -1) |
1991 | fatal_f("asmprintf failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1991, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "asmprintf failed" ); |
1992 | response = read_passphrase(display_prompt, echo ? RP_ECHO0x0001 : 0); |
1993 | if ((r = sshpkt_put_cstring(ssh, response)) != 0) |
1994 | goto out; |
1995 | freezero(response, strlen(response)); |
1996 | free(prompt); |
1997 | free(display_prompt); |
1998 | display_prompt = response = prompt = NULL((void*)0); |
1999 | } |
2000 | /* done with parsing incoming message. */ |
2001 | if ((r = sshpkt_get_end(ssh)) != 0 || |
2002 | (r = sshpkt_add_padding(ssh, 64)) != 0) |
2003 | goto out; |
2004 | r = sshpkt_send(ssh); |
2005 | out: |
2006 | if (response) |
2007 | freezero(response, strlen(response)); |
2008 | free(prompt); |
2009 | free(display_prompt); |
2010 | free(name); |
2011 | free(inst); |
2012 | free(lang); |
2013 | return r; |
2014 | } |
2015 | |
2016 | static int |
2017 | ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp, |
2018 | const u_char *data, size_t datalen) |
2019 | { |
2020 | struct sshbuf *b; |
2021 | struct stat st; |
2022 | pid_t pid; |
2023 | int r, to[2], from[2], status; |
2024 | int sock = ssh_packet_get_connection_in(ssh); |
2025 | u_char rversion = 0, version = 2; |
2026 | void (*osigchld)(int); |
2027 | |
2028 | *sigp = NULL((void*)0); |
2029 | *lenp = 0; |
2030 | |
2031 | if (stat(_PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", &st) == -1) { |
2032 | error_f("not installed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2032, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "not installed: %s" , strerror((*__errno()))); |
2033 | return -1; |
2034 | } |
2035 | if (fflush(stdout(&__sF[1])) != 0) { |
2036 | error_f("fflush: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2036, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "fflush: %s", strerror ((*__errno()))); |
2037 | return -1; |
2038 | } |
2039 | if (pipe(to) == -1) { |
2040 | error_f("pipe: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2040, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "pipe: %s", strerror ((*__errno()))); |
2041 | return -1; |
2042 | } |
2043 | if (pipe(from) == -1) { |
2044 | error_f("pipe: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2044, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "pipe: %s", strerror ((*__errno()))); |
2045 | return -1; |
2046 | } |
2047 | if ((pid = fork()) == -1) { |
2048 | error_f("fork: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2048, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "fork: %s", strerror ((*__errno()))); |
2049 | return -1; |
2050 | } |
2051 | osigchld = ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); |
2052 | if (pid == 0) { |
2053 | close(from[0]); |
2054 | if (dup2(from[1], STDOUT_FILENO1) == -1) |
2055 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2055, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "dup2: %s", strerror ((*__errno()))); |
2056 | close(to[1]); |
2057 | if (dup2(to[0], STDIN_FILENO0) == -1) |
2058 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2058, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "dup2: %s", strerror ((*__errno()))); |
2059 | close(from[1]); |
2060 | close(to[0]); |
2061 | |
2062 | if (dup2(sock, STDERR_FILENO2 + 1) == -1) |
2063 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2063, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "dup2: %s", strerror ((*__errno()))); |
2064 | sock = STDERR_FILENO2 + 1; |
2065 | fcntl(sock, F_SETFD2, 0); /* keep the socket on exec */ |
2066 | closefrom(sock + 1); |
2067 | |
2068 | debug3_f("[child] pid=%ld, exec %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2069, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "[child] pid=%ld, exec %s" , (long)getpid(), "/usr/libexec/ssh-keysign") |
2069 | (long)getpid(), _PATH_SSH_KEY_SIGN)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2069, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "[child] pid=%ld, exec %s" , (long)getpid(), "/usr/libexec/ssh-keysign"); |
2070 | execl(_PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", _PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", (char *)NULL((void*)0)); |
2071 | fatal_f("exec(%s): %s", _PATH_SSH_KEY_SIGN,sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2072, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "exec(%s): %s", "/usr/libexec/ssh-keysign" , strerror((*__errno()))) |
2072 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2072, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "exec(%s): %s", "/usr/libexec/ssh-keysign" , strerror((*__errno()))); |
2073 | } |
2074 | close(from[1]); |
2075 | close(to[0]); |
2076 | sock = STDERR_FILENO2 + 1; |
2077 | |
2078 | if ((b = sshbuf_new()) == NULL((void*)0)) |
2079 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2079, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
2080 | /* send # of sock, data to be signed */ |
2081 | if ((r = sshbuf_put_u32(b, sock)) != 0 || |
2082 | (r = sshbuf_put_string(b, data, datalen)) != 0) |
2083 | fatal_fr(r, "buffer error")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2083, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "buffer error"); |
2084 | if (ssh_msg_send(to[1], version, b) == -1) |
2085 | fatal_f("couldn't send request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2085, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "couldn't send request" ); |
2086 | sshbuf_reset(b); |
2087 | r = ssh_msg_recv(from[0], b); |
2088 | close(from[0]); |
2089 | close(to[1]); |
2090 | if (r < 0) { |
2091 | error_f("no reply")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2091, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "no reply"); |
2092 | goto fail; |
2093 | } |
2094 | |
2095 | errno(*__errno()) = 0; |
2096 | while (waitpid(pid, &status, 0) == -1) { |
2097 | if (errno(*__errno()) != EINTR4) { |
2098 | error_f("waitpid %ld: %s", (long)pid, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2098, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "waitpid %ld: %s", ( long)pid, strerror((*__errno()))); |
2099 | goto fail; |
2100 | } |
2101 | } |
2102 | if (!WIFEXITED(status)(((status) & 0177) == 0)) { |
2103 | error_f("exited abnormally")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2103, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "exited abnormally" ); |
2104 | goto fail; |
2105 | } |
2106 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) { |
2107 | error_f("exited with status %d", WEXITSTATUS(status))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2107, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)); |
2108 | goto fail; |
2109 | } |
2110 | if ((r = sshbuf_get_u8(b, &rversion)) != 0) { |
2111 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2111, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
2112 | goto fail; |
2113 | } |
2114 | if (rversion != version) { |
2115 | error_f("bad version")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2115, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "bad version"); |
2116 | goto fail; |
2117 | } |
2118 | if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) { |
2119 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2119, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
2120 | fail: |
2121 | ssh_signal(SIGCHLD20, osigchld); |
2122 | sshbuf_free(b); |
2123 | return -1; |
2124 | } |
2125 | ssh_signal(SIGCHLD20, osigchld); |
2126 | sshbuf_free(b); |
2127 | |
2128 | return 0; |
2129 | } |
2130 | |
2131 | static int |
2132 | userauth_hostbased(struct ssh *ssh) |
2133 | { |
2134 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
2135 | struct sshkey *private = NULL((void*)0); |
2136 | struct sshbuf *b = NULL((void*)0); |
2137 | u_char *sig = NULL((void*)0), *keyblob = NULL((void*)0); |
2138 | char *fp = NULL((void*)0), *chost = NULL((void*)0), *lname = NULL((void*)0); |
2139 | size_t siglen = 0, keylen = 0; |
2140 | int i, r, success = 0; |
2141 | |
2142 | if (authctxt->ktypes == NULL((void*)0)) { |
2143 | authctxt->oktypes = xstrdup(options.hostbased_accepted_algos); |
2144 | authctxt->ktypes = authctxt->oktypes; |
2145 | } |
2146 | |
2147 | /* |
2148 | * Work through each listed type pattern in HostbasedAcceptedAlgorithms, |
2149 | * trying each hostkey that matches the type in turn. |
2150 | */ |
2151 | for (;;) { |
2152 | if (authctxt->active_ktype == NULL((void*)0)) |
2153 | authctxt->active_ktype = strsep(&authctxt->ktypes, ","); |
2154 | if (authctxt->active_ktype == NULL((void*)0) || |
2155 | *authctxt->active_ktype == '\0') |
2156 | break; |
2157 | debug3_f("trying key type %s", authctxt->active_ktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2157, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "trying key type %s" , authctxt->active_ktype); |
2158 | |
2159 | /* check for a useful key */ |
2160 | private = NULL((void*)0); |
2161 | for (i = 0; i < authctxt->sensitive->nkeys; i++) { |
2162 | if (authctxt->sensitive->keys[i] == NULL((void*)0) || |
2163 | authctxt->sensitive->keys[i]->type == KEY_UNSPEC) |
2164 | continue; |
2165 | if (!sshkey_match_keyname_to_sigalgs( |
2166 | sshkey_ssh_name(authctxt->sensitive->keys[i]), |
2167 | authctxt->active_ktype)) |
2168 | continue; |
2169 | /* we take and free the key */ |
2170 | private = authctxt->sensitive->keys[i]; |
2171 | authctxt->sensitive->keys[i] = NULL((void*)0); |
2172 | break; |
2173 | } |
2174 | /* Found one */ |
2175 | if (private != NULL((void*)0)) |
2176 | break; |
2177 | /* No more keys of this type; advance */ |
2178 | authctxt->active_ktype = NULL((void*)0); |
2179 | } |
2180 | if (private == NULL((void*)0)) { |
2181 | free(authctxt->oktypes); |
2182 | authctxt->oktypes = authctxt->ktypes = NULL((void*)0); |
2183 | authctxt->active_ktype = NULL((void*)0); |
2184 | debug("No more client hostkeys for hostbased authentication.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2184, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "No more client hostkeys for hostbased authentication." ); |
2185 | goto out; |
2186 | } |
2187 | |
2188 | if ((fp = sshkey_fingerprint(private, options.fingerprint_hash, |
2189 | SSH_FP_DEFAULT)) == NULL((void*)0)) { |
2190 | error_f("sshkey_fingerprint failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2190, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "sshkey_fingerprint failed" ); |
2191 | goto out; |
2192 | } |
2193 | debug_f("trying hostkey %s %s using sigalg %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2194, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "trying hostkey %s %s using sigalg %s" , sshkey_ssh_name(private), fp, authctxt->active_ktype) |
2194 | sshkey_ssh_name(private), fp, authctxt->active_ktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2194, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "trying hostkey %s %s using sigalg %s" , sshkey_ssh_name(private), fp, authctxt->active_ktype); |
2195 | |
2196 | /* figure out a name for the client host */ |
2197 | lname = get_local_name(ssh_packet_get_connection_in(ssh)); |
2198 | if (lname == NULL((void*)0)) { |
2199 | error_f("cannot get local ipaddr/name")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2199, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "cannot get local ipaddr/name" ); |
2200 | goto out; |
2201 | } |
2202 | |
2203 | /* XXX sshbuf_put_stringf? */ |
2204 | xasprintf(&chost, "%s.", lname); |
2205 | debug2_f("chost %s", chost)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2205, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "chost %s", chost); |
2206 | |
2207 | /* construct data */ |
2208 | if ((b = sshbuf_new()) == NULL((void*)0)) { |
2209 | error_f("sshbuf_new failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2209, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "sshbuf_new failed" ); |
2210 | goto out; |
2211 | } |
2212 | if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) { |
2213 | error_fr(r, "sshkey_to_blob")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2213, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "sshkey_to_blob"); |
2214 | goto out; |
2215 | } |
2216 | if ((r = sshbuf_put_stringb(b, ssh->kex->session_id)) != 0 || |
2217 | (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
2218 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
2219 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
2220 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
2221 | (r = sshbuf_put_cstring(b, authctxt->active_ktype)) != 0 || |
2222 | (r = sshbuf_put_string(b, keyblob, keylen)) != 0 || |
2223 | (r = sshbuf_put_cstring(b, chost)) != 0 || |
2224 | (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) { |
2225 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2225, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
2226 | goto out; |
2227 | } |
2228 | |
2229 | #ifdef DEBUG_PK |
2230 | sshbuf_dump(b, stderr(&__sF[2])); |
2231 | #endif |
2232 | if ((r = ssh_keysign(ssh, private, &sig, &siglen, |
Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' | |
2233 | sshbuf_ptr(b), sshbuf_len(b))) != 0) { |
2234 | error("sign using hostkey %s %s failed",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2235, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "sign using hostkey %s %s failed" , sshkey_ssh_name(private), fp) |
2235 | sshkey_ssh_name(private), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2235, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "sign using hostkey %s %s failed" , sshkey_ssh_name(private), fp); |
2236 | goto out; |
2237 | } |
2238 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
2239 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
2240 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
2241 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
2242 | (r = sshpkt_put_cstring(ssh, authctxt->active_ktype)) != 0 || |
2243 | (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 || |
2244 | (r = sshpkt_put_cstring(ssh, chost)) != 0 || |
2245 | (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 || |
2246 | (r = sshpkt_put_string(ssh, sig, siglen)) != 0 || |
2247 | (r = sshpkt_send(ssh)) != 0) { |
2248 | error_fr(r, "packet error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2248, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "packet error"); |
2249 | goto out; |
2250 | } |
2251 | success = 1; |
2252 | |
2253 | out: |
2254 | if (sig != NULL((void*)0)) |
2255 | freezero(sig, siglen); |
2256 | free(keyblob); |
2257 | free(lname); |
2258 | free(fp); |
2259 | free(chost); |
2260 | sshkey_free(private); |
2261 | sshbuf_free(b); |
2262 | |
2263 | return success; |
2264 | } |
2265 | |
2266 | /* find auth method */ |
2267 | |
2268 | /* |
2269 | * given auth method name, if configurable options permit this method fill |
2270 | * in auth_ident field and return true, otherwise return false. |
2271 | */ |
2272 | static int |
2273 | authmethod_is_enabled(Authmethod *method) |
2274 | { |
2275 | if (method == NULL((void*)0)) |
2276 | return 0; |
2277 | /* return false if options indicate this method is disabled */ |
2278 | if (method->enabled == NULL((void*)0) || *method->enabled == 0) |
2279 | return 0; |
2280 | /* return false if batch mode is enabled but method needs interactive mode */ |
2281 | if (method->batch_flag != NULL((void*)0) && *method->batch_flag != 0) |
2282 | return 0; |
2283 | return 1; |
2284 | } |
2285 | |
2286 | static Authmethod * |
2287 | authmethod_lookup(const char *name) |
2288 | { |
2289 | Authmethod *method = NULL((void*)0); |
2290 | if (name != NULL((void*)0)) |
2291 | for (method = authmethods; method->name != NULL((void*)0); method++) |
2292 | if (strcmp(name, method->name) == 0) |
2293 | return method; |
2294 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2294, 0, SYSLOG_LEVEL_DEBUG2, ((void*)0), "Unrecognized authentication method name: %s" , name ? name : "NULL"); |
2295 | return NULL((void*)0); |
2296 | } |
2297 | |
2298 | /* XXX internal state */ |
2299 | static Authmethod *current = NULL((void*)0); |
2300 | static char *supported = NULL((void*)0); |
2301 | static char *preferred = NULL((void*)0); |
2302 | |
2303 | /* |
2304 | * Given the authentication method list sent by the server, return the |
2305 | * next method we should try. If the server initially sends a nil list, |
2306 | * use a built-in default list. |
2307 | */ |
2308 | static Authmethod * |
2309 | authmethod_get(char *authlist) |
2310 | { |
2311 | char *name = NULL((void*)0); |
2312 | u_int next; |
2313 | |
2314 | /* Use a suitable default if we're passed a nil list. */ |
2315 | if (authlist == NULL((void*)0) || strlen(authlist) == 0) |
2316 | authlist = options.preferred_authentications; |
2317 | |
2318 | if (supported == NULL((void*)0) || strcmp(authlist, supported) != 0) { |
2319 | debug3("start over, passed a different list %s", authlist)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2319, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "start over, passed a different list %s" , authlist); |
2320 | free(supported); |
2321 | supported = xstrdup(authlist); |
2322 | preferred = options.preferred_authentications; |
2323 | debug3("preferred %s", preferred)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2323, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "preferred %s", preferred ); |
2324 | current = NULL((void*)0); |
2325 | } else if (current != NULL((void*)0) && authmethod_is_enabled(current)) |
2326 | return current; |
2327 | |
2328 | for (;;) { |
2329 | if ((name = match_list(preferred, supported, &next)) == NULL((void*)0)) { |
2330 | debug("No more authentication methods to try.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2330, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "No more authentication methods to try." ); |
2331 | current = NULL((void*)0); |
2332 | return NULL((void*)0); |
2333 | } |
2334 | preferred += next; |
2335 | debug3("authmethod_lookup %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2335, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "authmethod_lookup %s" , name); |
2336 | debug3("remaining preferred: %s", preferred)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2336, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "remaining preferred: %s" , preferred); |
2337 | if ((current = authmethod_lookup(name)) != NULL((void*)0) && |
2338 | authmethod_is_enabled(current)) { |
2339 | debug3("authmethod_is_enabled %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2339, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "authmethod_is_enabled %s" , name); |
2340 | debug("Next authentication method: %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2340, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Next authentication method: %s" , name); |
2341 | free(name); |
2342 | return current; |
2343 | } |
2344 | free(name); |
2345 | } |
2346 | } |
2347 | |
2348 | static char * |
2349 | authmethods_get(void) |
2350 | { |
2351 | Authmethod *method = NULL((void*)0); |
2352 | struct sshbuf *b; |
2353 | char *list; |
2354 | int r; |
2355 | |
2356 | if ((b = sshbuf_new()) == NULL((void*)0)) |
2357 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2357, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed" ); |
2358 | for (method = authmethods; method->name != NULL((void*)0); method++) { |
2359 | if (authmethod_is_enabled(method)) { |
2360 | if ((r = sshbuf_putf(b, "%s%s", |
2361 | sshbuf_len(b) ? "," : "", method->name)) != 0) |
2362 | fatal_fr(r, "buffer error")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2362, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "buffer error"); |
2363 | } |
2364 | } |
2365 | if ((list = sshbuf_dup_string(b)) == NULL((void*)0)) |
2366 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2366, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_dup_string failed" ); |
2367 | sshbuf_free(b); |
2368 | return list; |
2369 | } |