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90d5350e | 1 | /* $OpenBSD: sshconnect2.c,v 1.168 2008/10/03 23:56:28 deraadt Exp $ */ |
a306f2dd | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
a306f2dd | 13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
c3ff311a | 27 | |
aa2eae64 | 28 | #include <sys/types.h> |
31652869 | 29 | #include <sys/socket.h> |
aa2eae64 | 30 | #include <sys/wait.h> |
4095f623 | 31 | #include <sys/stat.h> |
a306f2dd | 32 | |
028094f4 | 33 | #include <errno.h> |
b2349766 | 34 | #include <netdb.h> |
31652869 | 35 | #include <pwd.h> |
36 | #include <signal.h> | |
24436b92 | 37 | #include <stdarg.h> |
cf851879 | 38 | #include <stdio.h> |
00146caa | 39 | #include <string.h> |
67514848 | 40 | #include <unistd.h> |
3a69fb58 | 41 | #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) |
e5df5ff2 | 42 | #include <vis.h> |
3a69fb58 | 43 | #endif |
028094f4 | 44 | |
751092f9 | 45 | #include "openbsd-compat/sys-queue.h" |
46 | ||
31652869 | 47 | #include "xmalloc.h" |
a306f2dd | 48 | #include "ssh.h" |
42f11eb2 | 49 | #include "ssh2.h" |
a306f2dd | 50 | #include "buffer.h" |
51 | #include "packet.h" | |
a306f2dd | 52 | #include "compat.h" |
42f11eb2 | 53 | #include "cipher.h" |
31652869 | 54 | #include "key.h" |
a306f2dd | 55 | #include "kex.h" |
56 | #include "myproposal.h" | |
a306f2dd | 57 | #include "sshconnect.h" |
58 | #include "authfile.h" | |
db1cd2f3 | 59 | #include "dh.h" |
2e73a022 | 60 | #include "authfd.h" |
42f11eb2 | 61 | #include "log.h" |
62 | #include "readconf.h" | |
58ae9cb8 | 63 | #include "misc.h" |
cab80f75 | 64 | #include "match.h" |
a5c9ffdb | 65 | #include "dispatch.h" |
8002af61 | 66 | #include "canohost.h" |
39c00dc2 | 67 | #include "msg.h" |
68 | #include "pathnames.h" | |
82aeee5d | 69 | #include "uidswap.h" |
94ec8c6b | 70 | |
7364bd04 | 71 | #ifdef GSSAPI |
72 | #include "ssh-gss.h" | |
73 | #endif | |
74 | ||
a306f2dd | 75 | /* import */ |
76 | extern char *client_version_string; | |
77 | extern char *server_version_string; | |
78 | extern Options options; | |
79 | ||
80 | /* | |
81 | * SSH2 key exchange | |
82 | */ | |
83 | ||
1e3b8b07 | 84 | u_char *session_id2 = NULL; |
a27002e5 | 85 | u_int session_id2_len = 0; |
a306f2dd | 86 | |
a5c9ffdb | 87 | char *xxx_host; |
88 | struct sockaddr *xxx_hostaddr; | |
89 | ||
e092ce67 | 90 | Kex *xxx_kex = NULL; |
91 | ||
396c147e | 92 | static int |
f49bc4f7 | 93 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 94 | { |
f49bc4f7 | 95 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 96 | fatal("Host key verification failed."); |
a5c9ffdb | 97 | return 0; |
98 | } | |
99 | ||
a306f2dd | 100 | void |
94ec8c6b | 101 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
102 | { | |
94ec8c6b | 103 | Kex *kex; |
a5c9ffdb | 104 | |
105 | xxx_host = host; | |
106 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 107 | |
c523303b | 108 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 109 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 110 | options.ciphers = NULL; |
94ec8c6b | 111 | } |
112 | if (options.ciphers != NULL) { | |
113 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
114 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
115 | } | |
1ad64a93 | 116 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
117 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
118 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
119 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 120 | if (options.compression) { |
b2552997 | 121 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 122 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 123 | } else { |
b2552997 | 124 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 125 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 126 | } |
b2552997 | 127 | if (options.macs != NULL) { |
128 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
129 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
130 | } | |
e961a8f9 | 131 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 132 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 133 | options.hostkeyalgorithms; |
94ec8c6b | 134 | |
ffd7b36b | 135 | if (options.rekey_limit) |
fe771396 | 136 | packet_set_rekey_limit((u_int32_t)options.rekey_limit); |
ffd7b36b | 137 | |
7a37c112 | 138 | /* start key exchange */ |
d8ee838b | 139 | kex = kex_setup(myproposal); |
98a58eda | 140 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 141 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 142 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 143 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 144 | kex->client_version_string=client_version_string; |
145 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 146 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 147 | |
e092ce67 | 148 | xxx_kex = kex; |
149 | ||
c422989b | 150 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 151 | |
d1ac6175 | 152 | session_id2 = kex->session_id; |
153 | session_id2_len = kex->session_id_len; | |
154 | ||
94ec8c6b | 155 | #ifdef DEBUG_KEXDH |
156 | /* send 1st encrypted/maced/compressed message */ | |
157 | packet_start(SSH2_MSG_IGNORE); | |
158 | packet_put_cstring("markus"); | |
159 | packet_send(); | |
160 | packet_write_wait(); | |
161 | #endif | |
a306f2dd | 162 | } |
71276795 | 163 | |
a306f2dd | 164 | /* |
165 | * Authenticate user | |
166 | */ | |
188adeb2 | 167 | |
168 | typedef struct Authctxt Authctxt; | |
169 | typedef struct Authmethod Authmethod; | |
43348518 | 170 | typedef struct identity Identity; |
171 | typedef struct idlist Idlist; | |
172 | ||
173 | struct identity { | |
174 | TAILQ_ENTRY(identity) next; | |
175 | AuthenticationConnection *ac; /* set if agent supports key */ | |
176 | Key *key; /* public/private key */ | |
177 | char *filename; /* comment for agent-only keys */ | |
178 | int tried; | |
179 | int isprivate; /* key points to the private key */ | |
180 | }; | |
181 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 182 | |
183 | struct Authctxt { | |
184 | const char *server_user; | |
8002af61 | 185 | const char *local_user; |
188adeb2 | 186 | const char *host; |
187 | const char *service; | |
188adeb2 | 188 | Authmethod *method; |
94ec8c6b | 189 | int success; |
fee56204 | 190 | char *authlist; |
8002af61 | 191 | /* pubkey */ |
43348518 | 192 | Idlist keys; |
8002af61 | 193 | AuthenticationConnection *agent; |
194 | /* hostbased */ | |
39c00dc2 | 195 | Sensitive *sensitive; |
6b759005 | 196 | /* kbd-interactive */ |
197 | int info_req_seen; | |
7364bd04 | 198 | /* generic */ |
199 | void *methoddata; | |
188adeb2 | 200 | }; |
201 | struct Authmethod { | |
202 | char *name; /* string to compare against server's list */ | |
203 | int (*userauth)(Authctxt *authctxt); | |
204 | int *enabled; /* flag in option struct that enables method */ | |
205 | int *batch_flag; /* flag in option struct that disables method */ | |
206 | }; | |
207 | ||
7819b5c3 | 208 | void input_userauth_success(int, u_int32_t, void *); |
209 | void input_userauth_failure(int, u_int32_t, void *); | |
210 | void input_userauth_banner(int, u_int32_t, void *); | |
211 | void input_userauth_error(int, u_int32_t, void *); | |
212 | void input_userauth_info_req(int, u_int32_t, void *); | |
213 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 214 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 215 | |
d5bb9418 | 216 | int userauth_none(Authctxt *); |
217 | int userauth_pubkey(Authctxt *); | |
218 | int userauth_passwd(Authctxt *); | |
219 | int userauth_kbdint(Authctxt *); | |
220 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 221 | int userauth_kerberos(Authctxt *); |
188adeb2 | 222 | |
7364bd04 | 223 | #ifdef GSSAPI |
224 | int userauth_gssapi(Authctxt *authctxt); | |
225 | void input_gssapi_response(int type, u_int32_t, void *); | |
226 | void input_gssapi_token(int type, u_int32_t, void *); | |
227 | void input_gssapi_hash(int type, u_int32_t, void *); | |
228 | void input_gssapi_error(int, u_int32_t, void *); | |
229 | void input_gssapi_errtok(int, u_int32_t, void *); | |
230 | #endif | |
231 | ||
d5bb9418 | 232 | void userauth(Authctxt *, char *); |
fee56204 | 233 | |
43348518 | 234 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 235 | static void pubkey_prepare(Authctxt *); |
236 | static void pubkey_cleanup(Authctxt *); | |
237 | static Key *load_identity_file(char *); | |
fee56204 | 238 | |
396c147e | 239 | static Authmethod *authmethod_get(char *authlist); |
240 | static Authmethod *authmethod_lookup(const char *name); | |
241 | static char *authmethods_get(void); | |
188adeb2 | 242 | |
243 | Authmethod authmethods[] = { | |
7364bd04 | 244 | #ifdef GSSAPI |
0789992b | 245 | {"gssapi-with-mic", |
7364bd04 | 246 | userauth_gssapi, |
247 | &options.gss_authentication, | |
248 | NULL}, | |
249 | #endif | |
3398dda9 | 250 | {"hostbased", |
251 | userauth_hostbased, | |
252 | &options.hostbased_authentication, | |
253 | NULL}, | |
9f37c0af | 254 | {"publickey", |
255 | userauth_pubkey, | |
256 | &options.pubkey_authentication, | |
257 | NULL}, | |
94ec8c6b | 258 | {"keyboard-interactive", |
259 | userauth_kbdint, | |
260 | &options.kbd_interactive_authentication, | |
261 | &options.batch_mode}, | |
9f37c0af | 262 | {"password", |
263 | userauth_passwd, | |
264 | &options.password_authentication, | |
265 | &options.batch_mode}, | |
94ec8c6b | 266 | {"none", |
267 | userauth_none, | |
268 | NULL, | |
269 | NULL}, | |
188adeb2 | 270 | {NULL, NULL, NULL, NULL} |
271 | }; | |
272 | ||
273 | void | |
8002af61 | 274 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 275 | Sensitive *sensitive) |
188adeb2 | 276 | { |
277 | Authctxt authctxt; | |
278 | int type; | |
188adeb2 | 279 | |
5ba55ada | 280 | if (options.challenge_response_authentication) |
d464095c | 281 | options.kbd_interactive_authentication = 1; |
282 | ||
188adeb2 | 283 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
284 | packet_put_cstring("ssh-userauth"); | |
285 | packet_send(); | |
a77673cc | 286 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 287 | packet_write_wait(); |
54a5250f | 288 | type = packet_read(); |
a77673cc | 289 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
290 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 291 | if (packet_remaining() > 0) { |
54a5250f | 292 | char *reply = packet_get_string(NULL); |
a77673cc | 293 | debug2("service_accept: %s", reply); |
188adeb2 | 294 | xfree(reply); |
188adeb2 | 295 | } else { |
6226a8f8 | 296 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 297 | } |
95500969 | 298 | packet_check_eom(); |
a77673cc | 299 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 300 | |
cab80f75 | 301 | if (options.preferred_authentications == NULL) |
302 | options.preferred_authentications = authmethods_get(); | |
303 | ||
188adeb2 | 304 | /* setup authentication context */ |
6b759005 | 305 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 306 | pubkey_prepare(&authctxt); |
188adeb2 | 307 | authctxt.server_user = server_user; |
8002af61 | 308 | authctxt.local_user = local_user; |
188adeb2 | 309 | authctxt.host = host; |
310 | authctxt.service = "ssh-connection"; /* service name */ | |
311 | authctxt.success = 0; | |
94ec8c6b | 312 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 313 | authctxt.authlist = NULL; |
7364bd04 | 314 | authctxt.methoddata = NULL; |
39c00dc2 | 315 | authctxt.sensitive = sensitive; |
6b759005 | 316 | authctxt.info_req_seen = 0; |
94ec8c6b | 317 | if (authctxt.method == NULL) |
318 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 319 | |
320 | /* initial userauth request */ | |
94ec8c6b | 321 | userauth_none(&authctxt); |
188adeb2 | 322 | |
7a37c112 | 323 | dispatch_init(&input_userauth_error); |
188adeb2 | 324 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
325 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 326 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 327 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
328 | ||
43348518 | 329 | pubkey_cleanup(&authctxt); |
b8c2031b | 330 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
331 | ||
6226a8f8 | 332 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 333 | } |
b8c2031b | 334 | |
188adeb2 | 335 | void |
fee56204 | 336 | userauth(Authctxt *authctxt, char *authlist) |
337 | { | |
7364bd04 | 338 | if (authctxt->methoddata) { |
339 | xfree(authctxt->methoddata); | |
340 | authctxt->methoddata = NULL; | |
341 | } | |
fee56204 | 342 | if (authlist == NULL) { |
343 | authlist = authctxt->authlist; | |
344 | } else { | |
345 | if (authctxt->authlist) | |
346 | xfree(authctxt->authlist); | |
347 | authctxt->authlist = authlist; | |
348 | } | |
349 | for (;;) { | |
350 | Authmethod *method = authmethod_get(authlist); | |
351 | if (method == NULL) | |
352 | fatal("Permission denied (%s).", authlist); | |
353 | authctxt->method = method; | |
b8c2031b | 354 | |
355 | /* reset the per method handler */ | |
356 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
357 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
358 | ||
359 | /* and try new method */ | |
fee56204 | 360 | if (method->userauth(authctxt) != 0) { |
361 | debug2("we sent a %s packet, wait for reply", method->name); | |
362 | break; | |
363 | } else { | |
364 | debug2("we did not send a packet, disable method"); | |
365 | method->enabled = NULL; | |
366 | } | |
367 | } | |
368 | } | |
d6133f43 | 369 | |
fee56204 | 370 | void |
7819b5c3 | 371 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 372 | { |
9616313f | 373 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 374 | "type %d", type); |
9616313f | 375 | } |
d6133f43 | 376 | |
9616313f | 377 | void |
7819b5c3 | 378 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 379 | { |
e5df5ff2 | 380 | char *msg, *raw, *lang; |
381 | u_int len; | |
c8f0cf13 | 382 | |
9616313f | 383 | debug3("input_userauth_banner"); |
e5df5ff2 | 384 | raw = packet_get_string(&len); |
9616313f | 385 | lang = packet_get_string(NULL); |
341cb46b | 386 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) { |
e5df5ff2 | 387 | if (len > 65536) |
388 | len = 65536; | |
90d5350e | 389 | msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */ |
390 | strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL); | |
19e633e7 | 391 | fprintf(stderr, "%s", msg); |
e5df5ff2 | 392 | xfree(msg); |
393 | } | |
394 | xfree(raw); | |
9616313f | 395 | xfree(lang); |
188adeb2 | 396 | } |
d6133f43 | 397 | |
188adeb2 | 398 | void |
7819b5c3 | 399 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 400 | { |
401 | Authctxt *authctxt = ctxt; | |
402 | if (authctxt == NULL) | |
403 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 404 | if (authctxt->authlist) { |
fee56204 | 405 | xfree(authctxt->authlist); |
c8f0cf13 | 406 | authctxt->authlist = NULL; |
407 | } | |
408 | if (authctxt->methoddata) { | |
7364bd04 | 409 | xfree(authctxt->methoddata); |
c8f0cf13 | 410 | authctxt->methoddata = NULL; |
411 | } | |
188adeb2 | 412 | authctxt->success = 1; /* break out */ |
413 | } | |
d6133f43 | 414 | |
188adeb2 | 415 | void |
7819b5c3 | 416 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 417 | { |
188adeb2 | 418 | Authctxt *authctxt = ctxt; |
419 | char *authlist = NULL; | |
420 | int partial; | |
188adeb2 | 421 | |
422 | if (authctxt == NULL) | |
423 | fatal("input_userauth_failure: no authentication context"); | |
424 | ||
94ec8c6b | 425 | authlist = packet_get_string(NULL); |
188adeb2 | 426 | partial = packet_get_char(); |
95500969 | 427 | packet_check_eom(); |
188adeb2 | 428 | |
429 | if (partial != 0) | |
bbe88b6d | 430 | logit("Authenticated with partial success."); |
6226a8f8 | 431 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 432 | |
fee56204 | 433 | userauth(authctxt, authlist); |
434 | } | |
435 | void | |
7819b5c3 | 436 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 437 | { |
438 | Authctxt *authctxt = ctxt; | |
439 | Key *key = NULL; | |
43348518 | 440 | Identity *id = NULL; |
fee56204 | 441 | Buffer b; |
c66f9d0e | 442 | int pktype, sent = 0; |
443 | u_int alen, blen; | |
444 | char *pkalg, *fp; | |
445 | u_char *pkblob; | |
fee56204 | 446 | |
447 | if (authctxt == NULL) | |
448 | fatal("input_userauth_pk_ok: no authentication context"); | |
449 | if (datafellows & SSH_BUG_PKOK) { | |
450 | /* this is similar to SSH_BUG_PKAUTH */ | |
451 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
452 | pkblob = packet_get_string(&blen); | |
453 | buffer_init(&b); | |
454 | buffer_append(&b, pkblob, blen); | |
455 | pkalg = buffer_get_string(&b, &alen); | |
456 | buffer_free(&b); | |
457 | } else { | |
458 | pkalg = packet_get_string(&alen); | |
459 | pkblob = packet_get_string(&blen); | |
460 | } | |
95500969 | 461 | packet_check_eom(); |
fee56204 | 462 | |
43348518 | 463 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 464 | |
43348518 | 465 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
466 | debug("unknown pkalg %s", pkalg); | |
467 | goto done; | |
468 | } | |
469 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
470 | debug("no key from blob. pkalg %s", pkalg); | |
471 | goto done; | |
472 | } | |
473 | if (key->type != pktype) { | |
474 | error("input_userauth_pk_ok: type mismatch " | |
475 | "for decoded key (received %d, expected %d)", | |
476 | key->type, pktype); | |
477 | goto done; | |
478 | } | |
479 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
480 | debug2("input_userauth_pk_ok: fp %s", fp); | |
481 | xfree(fp); | |
482 | ||
b56e99e2 | 483 | /* |
484 | * search keys in the reverse order, because last candidate has been | |
485 | * moved to the end of the queue. this also avoids confusion by | |
486 | * duplicate keys | |
487 | */ | |
484b2208 | 488 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 489 | if (key_equal(key, id->key)) { |
490 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 491 | break; |
492 | } | |
43348518 | 493 | } |
494 | done: | |
fee56204 | 495 | if (key != NULL) |
496 | key_free(key); | |
497 | xfree(pkalg); | |
498 | xfree(pkblob); | |
499 | ||
343288b8 | 500 | /* try another method if we did not send a packet */ |
fee56204 | 501 | if (sent == 0) |
502 | userauth(authctxt, NULL); | |
188adeb2 | 503 | } |
504 | ||
7364bd04 | 505 | #ifdef GSSAPI |
aff51935 | 506 | int |
7364bd04 | 507 | userauth_gssapi(Authctxt *authctxt) |
508 | { | |
509 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 510 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 511 | static u_int mech = 0; |
7364bd04 | 512 | OM_uint32 min; |
513 | int ok = 0; | |
514 | ||
515 | /* Try one GSSAPI method at a time, rather than sending them all at | |
516 | * once. */ | |
517 | ||
b0b30ca6 | 518 | if (gss_supported == NULL) |
519 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 520 | |
521 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 522 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 523 | /* My DER encoding requires length<128 */ |
b0b30ca6 | 524 | if (gss_supported->elements[mech].length < 128 && |
592de384 | 525 | ssh_gssapi_check_mechanism(&gssctxt, |
526 | &gss_supported->elements[mech], authctxt->host)) { | |
7364bd04 | 527 | ok = 1; /* Mechanism works */ |
528 | } else { | |
529 | mech++; | |
530 | } | |
531 | } | |
532 | ||
592de384 | 533 | if (!ok) |
2ceb8101 | 534 | return 0; |
7364bd04 | 535 | |
536 | authctxt->methoddata=(void *)gssctxt; | |
537 | ||
538 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
539 | packet_put_cstring(authctxt->server_user); | |
540 | packet_put_cstring(authctxt->service); | |
541 | packet_put_cstring(authctxt->method->name); | |
542 | ||
543 | packet_put_int(1); | |
544 | ||
d8d9afd0 | 545 | packet_put_int((gss_supported->elements[mech].length) + 2); |
546 | packet_put_char(SSH_GSS_OIDTYPE); | |
547 | packet_put_char(gss_supported->elements[mech].length); | |
548 | packet_put_raw(gss_supported->elements[mech].elements, | |
549 | gss_supported->elements[mech].length); | |
7364bd04 | 550 | |
551 | packet_send(); | |
552 | ||
553 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
554 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
555 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
556 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
557 | ||
558 | mech++; /* Move along to next candidate */ | |
559 | ||
560 | return 1; | |
561 | } | |
562 | ||
b930668c | 563 | static OM_uint32 |
564 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
565 | { | |
566 | Authctxt *authctxt = ctxt; | |
567 | Gssctxt *gssctxt = authctxt->methoddata; | |
568 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 569 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
570 | gss_buffer_desc gssbuf; | |
0789992b | 571 | OM_uint32 status, ms, flags; |
572 | Buffer b; | |
b6453d99 | 573 | |
b930668c | 574 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 575 | recv_tok, &send_tok, &flags); |
b930668c | 576 | |
577 | if (send_tok.length > 0) { | |
578 | if (GSS_ERROR(status)) | |
579 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
580 | else | |
581 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 582 | |
b930668c | 583 | packet_put_string(send_tok.value, send_tok.length); |
584 | packet_send(); | |
585 | gss_release_buffer(&ms, &send_tok); | |
586 | } | |
b6453d99 | 587 | |
b930668c | 588 | if (status == GSS_S_COMPLETE) { |
0789992b | 589 | /* send either complete or MIC, depending on mechanism */ |
590 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
591 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
592 | packet_send(); | |
593 | } else { | |
594 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
595 | authctxt->service, "gssapi-with-mic"); | |
596 | ||
597 | gssbuf.value = buffer_ptr(&b); | |
598 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 599 | |
0789992b | 600 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 601 | |
0789992b | 602 | if (!GSS_ERROR(status)) { |
603 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
604 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 605 | |
0789992b | 606 | packet_send(); |
607 | } | |
b6453d99 | 608 | |
0789992b | 609 | buffer_free(&b); |
610 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 611 | } |
b930668c | 612 | } |
b6453d99 | 613 | |
b930668c | 614 | return status; |
615 | } | |
616 | ||
7364bd04 | 617 | void |
618 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
619 | { | |
620 | Authctxt *authctxt = ctxt; | |
621 | Gssctxt *gssctxt; | |
7364bd04 | 622 | int oidlen; |
623 | char *oidv; | |
7364bd04 | 624 | |
625 | if (authctxt == NULL) | |
626 | fatal("input_gssapi_response: no authentication context"); | |
627 | gssctxt = authctxt->methoddata; | |
628 | ||
629 | /* Setup our OID */ | |
630 | oidv = packet_get_string(&oidlen); | |
631 | ||
d8d9afd0 | 632 | if (oidlen <= 2 || |
633 | oidv[0] != SSH_GSS_OIDTYPE || | |
634 | oidv[1] != oidlen - 2) { | |
b930668c | 635 | xfree(oidv); |
d8d9afd0 | 636 | debug("Badly encoded mechanism OID received"); |
637 | userauth(authctxt, NULL); | |
d8d9afd0 | 638 | return; |
7364bd04 | 639 | } |
640 | ||
d8d9afd0 | 641 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
642 | fatal("Server returned different OID than expected"); | |
643 | ||
7364bd04 | 644 | packet_check_eom(); |
645 | ||
646 | xfree(oidv); | |
647 | ||
b930668c | 648 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 649 | /* Start again with next method on list */ |
650 | debug("Trying to start again"); | |
651 | userauth(authctxt, NULL); | |
652 | return; | |
653 | } | |
7364bd04 | 654 | } |
655 | ||
656 | void | |
657 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
658 | { | |
659 | Authctxt *authctxt = ctxt; | |
7364bd04 | 660 | gss_buffer_desc recv_tok; |
b930668c | 661 | OM_uint32 status; |
7364bd04 | 662 | u_int slen; |
663 | ||
664 | if (authctxt == NULL) | |
665 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 666 | |
667 | recv_tok.value = packet_get_string(&slen); | |
668 | recv_tok.length = slen; /* safe typecast */ | |
669 | ||
670 | packet_check_eom(); | |
671 | ||
b930668c | 672 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 673 | |
674 | xfree(recv_tok.value); | |
675 | ||
676 | if (GSS_ERROR(status)) { | |
7364bd04 | 677 | /* Start again with the next method in the list */ |
678 | userauth(authctxt, NULL); | |
679 | return; | |
680 | } | |
7364bd04 | 681 | } |
682 | ||
683 | void | |
684 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
685 | { | |
686 | Authctxt *authctxt = ctxt; | |
687 | Gssctxt *gssctxt; | |
688 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
689 | gss_buffer_desc recv_tok; | |
690 | OM_uint32 status, ms; | |
f99e1ca4 | 691 | u_int len; |
7364bd04 | 692 | |
693 | if (authctxt == NULL) | |
694 | fatal("input_gssapi_response: no authentication context"); | |
695 | gssctxt = authctxt->methoddata; | |
696 | ||
f99e1ca4 | 697 | recv_tok.value = packet_get_string(&len); |
698 | recv_tok.length = len; | |
7364bd04 | 699 | |
700 | packet_check_eom(); | |
701 | ||
702 | /* Stick it into GSSAPI and see what it says */ | |
703 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 704 | &recv_tok, &send_tok, NULL); |
7364bd04 | 705 | |
706 | xfree(recv_tok.value); | |
707 | gss_release_buffer(&ms, &send_tok); | |
708 | ||
709 | /* Server will be returning a failed packet after this one */ | |
710 | } | |
711 | ||
712 | void | |
713 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
714 | { | |
715 | OM_uint32 maj, min; | |
716 | char *msg; | |
717 | char *lang; | |
718 | ||
719 | maj=packet_get_int(); | |
720 | min=packet_get_int(); | |
721 | msg=packet_get_string(NULL); | |
722 | lang=packet_get_string(NULL); | |
723 | ||
724 | packet_check_eom(); | |
725 | ||
17318dd6 | 726 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 727 | xfree(msg); |
728 | xfree(lang); | |
729 | } | |
730 | #endif /* GSSAPI */ | |
731 | ||
94ec8c6b | 732 | int |
733 | userauth_none(Authctxt *authctxt) | |
734 | { | |
735 | /* initial userauth request */ | |
736 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
737 | packet_put_cstring(authctxt->server_user); | |
738 | packet_put_cstring(authctxt->service); | |
739 | packet_put_cstring(authctxt->method->name); | |
740 | packet_send(); | |
94ec8c6b | 741 | return 1; |
742 | } | |
743 | ||
a306f2dd | 744 | int |
188adeb2 | 745 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 746 | { |
1d1ffb87 | 747 | static int attempt = 0; |
67ec167d | 748 | char prompt[150]; |
a306f2dd | 749 | char *password; |
750 | ||
fa649821 | 751 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 752 | return 0; |
753 | ||
6aacefa7 | 754 | if (attempt != 1) |
fa649821 | 755 | error("Permission denied, please try again."); |
756 | ||
f72e01a5 | 757 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 758 | authctxt->server_user, authctxt->host); |
a306f2dd | 759 | password = read_passphrase(prompt, 0); |
760 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 761 | packet_put_cstring(authctxt->server_user); |
762 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 763 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 764 | packet_put_char(0); |
a6215e53 | 765 | packet_put_cstring(password); |
a306f2dd | 766 | memset(password, 0, strlen(password)); |
767 | xfree(password); | |
b4b701be | 768 | packet_add_padding(64); |
a306f2dd | 769 | packet_send(); |
67ec167d | 770 | |
7203d6bb | 771 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 772 | &input_userauth_passwd_changereq); |
773 | ||
a306f2dd | 774 | return 1; |
775 | } | |
67ec167d | 776 | /* |
777 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
778 | */ | |
779 | void | |
ef077e37 | 780 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 781 | { |
782 | Authctxt *authctxt = ctxt; | |
783 | char *info, *lang, *password = NULL, *retype = NULL; | |
784 | char prompt[150]; | |
785 | ||
786 | debug2("input_userauth_passwd_changereq"); | |
787 | ||
788 | if (authctxt == NULL) | |
789 | fatal("input_userauth_passwd_changereq: " | |
790 | "no authentication context"); | |
791 | ||
792 | info = packet_get_string(NULL); | |
793 | lang = packet_get_string(NULL); | |
794 | if (strlen(info) > 0) | |
bbe88b6d | 795 | logit("%s", info); |
67ec167d | 796 | xfree(info); |
797 | xfree(lang); | |
798 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
799 | packet_put_cstring(authctxt->server_user); | |
800 | packet_put_cstring(authctxt->service); | |
801 | packet_put_cstring(authctxt->method->name); | |
802 | packet_put_char(1); /* additional info */ | |
7203d6bb | 803 | snprintf(prompt, sizeof(prompt), |
67ec167d | 804 | "Enter %.30s@%.128s's old password: ", |
805 | authctxt->server_user, authctxt->host); | |
806 | password = read_passphrase(prompt, 0); | |
807 | packet_put_cstring(password); | |
808 | memset(password, 0, strlen(password)); | |
809 | xfree(password); | |
810 | password = NULL; | |
811 | while (password == NULL) { | |
7203d6bb | 812 | snprintf(prompt, sizeof(prompt), |
67ec167d | 813 | "Enter %.30s@%.128s's new password: ", |
814 | authctxt->server_user, authctxt->host); | |
815 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
816 | if (password == NULL) { | |
817 | /* bail out */ | |
818 | return; | |
819 | } | |
7203d6bb | 820 | snprintf(prompt, sizeof(prompt), |
67ec167d | 821 | "Retype %.30s@%.128s's new password: ", |
822 | authctxt->server_user, authctxt->host); | |
823 | retype = read_passphrase(prompt, 0); | |
824 | if (strcmp(password, retype) != 0) { | |
825 | memset(password, 0, strlen(password)); | |
826 | xfree(password); | |
bbe88b6d | 827 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 828 | password = NULL; |
829 | } | |
830 | memset(retype, 0, strlen(retype)); | |
831 | xfree(retype); | |
832 | } | |
833 | packet_put_cstring(password); | |
834 | memset(password, 0, strlen(password)); | |
835 | xfree(password); | |
836 | packet_add_padding(64); | |
837 | packet_send(); | |
7203d6bb | 838 | |
839 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 840 | &input_userauth_passwd_changereq); |
841 | } | |
a306f2dd | 842 | |
43348518 | 843 | static int |
844 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
845 | u_char *data, u_int datalen) | |
846 | { | |
847 | Key *prv; | |
848 | int ret; | |
849 | ||
850 | /* the agent supports this key */ | |
851 | if (id->ac) | |
852 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
853 | data, datalen)); | |
854 | /* | |
855 | * we have already loaded the private key or | |
856 | * the private key is stored in external hardware | |
857 | */ | |
858 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
859 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
860 | /* load the private key from the file */ | |
861 | if ((prv = load_identity_file(id->filename)) == NULL) | |
862 | return (-1); | |
863 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
864 | key_free(prv); | |
865 | return (ret); | |
fee56204 | 866 | } |
867 | ||
396c147e | 868 | static int |
43348518 | 869 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 870 | { |
871 | Buffer b; | |
1e3b8b07 | 872 | u_char *blob, *signature; |
c66f9d0e | 873 | u_int bloblen, slen; |
a27002e5 | 874 | u_int skip = 0; |
2e73a022 | 875 | int ret = -1; |
94ec8c6b | 876 | int have_sig = 1; |
a306f2dd | 877 | |
cbc5abf9 | 878 | debug3("sign_and_send_pubkey"); |
fee56204 | 879 | |
43348518 | 880 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 881 | /* we cannot handle this key */ |
cbc5abf9 | 882 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 883 | return 0; |
884 | } | |
a306f2dd | 885 | /* data to be signed */ |
886 | buffer_init(&b); | |
33de75a3 | 887 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 888 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 889 | skip = session_id2_len; |
33de75a3 | 890 | } else { |
891 | buffer_put_string(&b, session_id2, session_id2_len); | |
892 | skip = buffer_len(&b); | |
74fc9186 | 893 | } |
a306f2dd | 894 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 895 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 896 | buffer_put_cstring(&b, |
cbc5abf9 | 897 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 898 | "ssh-userauth" : |
188adeb2 | 899 | authctxt->service); |
cbc5abf9 | 900 | if (datafellows & SSH_BUG_PKAUTH) { |
901 | buffer_put_char(&b, have_sig); | |
902 | } else { | |
903 | buffer_put_cstring(&b, authctxt->method->name); | |
904 | buffer_put_char(&b, have_sig); | |
43348518 | 905 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 906 | } |
a306f2dd | 907 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 908 | |
909 | /* generate signature */ | |
43348518 | 910 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 911 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 912 | if (ret == -1) { |
913 | xfree(blob); | |
914 | buffer_free(&b); | |
915 | return 0; | |
916 | } | |
fa08c86b | 917 | #ifdef DEBUG_PK |
a306f2dd | 918 | buffer_dump(&b); |
919 | #endif | |
cbc5abf9 | 920 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 921 | buffer_clear(&b); |
922 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 923 | skip = session_id2_len; |
d0c832f3 | 924 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 925 | buffer_put_cstring(&b, authctxt->server_user); |
926 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 927 | buffer_put_cstring(&b, authctxt->method->name); |
928 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 929 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 930 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 931 | buffer_put_string(&b, blob, bloblen); |
932 | } | |
933 | xfree(blob); | |
fee56204 | 934 | |
a306f2dd | 935 | /* append signature */ |
936 | buffer_put_string(&b, signature, slen); | |
937 | xfree(signature); | |
938 | ||
939 | /* skip session id and packet type */ | |
74fc9186 | 940 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 941 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 942 | buffer_consume(&b, skip + 1); |
a306f2dd | 943 | |
944 | /* put remaining data from buffer into packet */ | |
945 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
946 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
947 | buffer_free(&b); | |
a306f2dd | 948 | packet_send(); |
2e73a022 | 949 | |
950 | return 1; | |
4c8722d9 | 951 | } |
952 | ||
396c147e | 953 | static int |
43348518 | 954 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 955 | { |
fee56204 | 956 | u_char *blob; |
21b30f38 | 957 | u_int bloblen, have_sig = 0; |
4c8722d9 | 958 | |
fee56204 | 959 | debug3("send_pubkey_test"); |
960 | ||
43348518 | 961 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 962 | /* we cannot handle this key */ |
963 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 964 | return 0; |
965 | } | |
fee56204 | 966 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 967 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 968 | |
fee56204 | 969 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
970 | packet_put_cstring(authctxt->server_user); | |
971 | packet_put_cstring(authctxt->service); | |
972 | packet_put_cstring(authctxt->method->name); | |
973 | packet_put_char(have_sig); | |
974 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 975 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 976 | packet_put_string(blob, bloblen); |
977 | xfree(blob); | |
978 | packet_send(); | |
979 | return 1; | |
980 | } | |
981 | ||
396c147e | 982 | static Key * |
fee56204 | 983 | load_identity_file(char *filename) |
984 | { | |
985 | Key *private; | |
986 | char prompt[300], *passphrase; | |
fc231518 | 987 | int perm_ok, quit, i; |
d156519a | 988 | struct stat st; |
fee56204 | 989 | |
d156519a | 990 | if (stat(filename, &st) < 0) { |
991 | debug3("no such identity: %s", filename); | |
992 | return NULL; | |
993 | } | |
fc231518 | 994 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
995 | if (!perm_ok) | |
996 | return NULL; | |
aeaa3d9e | 997 | if (private == NULL) { |
998 | if (options.batch_mode) | |
fee56204 | 999 | return NULL; |
4c8722d9 | 1000 | snprintf(prompt, sizeof prompt, |
184eed6a | 1001 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 1002 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1003 | passphrase = read_passphrase(prompt, 0); | |
1004 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 1005 | private = key_load_private_type(KEY_UNSPEC, |
1006 | filename, passphrase, NULL, NULL); | |
fee56204 | 1007 | quit = 0; |
188adeb2 | 1008 | } else { |
1009 | debug2("no passphrase given, try next key"); | |
fee56204 | 1010 | quit = 1; |
188adeb2 | 1011 | } |
1012 | memset(passphrase, 0, strlen(passphrase)); | |
1013 | xfree(passphrase); | |
aeaa3d9e | 1014 | if (private != NULL || quit) |
188adeb2 | 1015 | break; |
1016 | debug2("bad passphrase given, try again..."); | |
1017 | } | |
4c8722d9 | 1018 | } |
fee56204 | 1019 | return private; |
1020 | } | |
1021 | ||
43348518 | 1022 | /* |
1023 | * try keys in the following order: | |
1024 | * 1. agent keys that are found in the config file | |
1025 | * 2. other agent keys | |
1026 | * 3. keys that are only listed in the config file | |
1027 | */ | |
1028 | static void | |
1029 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1030 | { |
43348518 | 1031 | Identity *id; |
1032 | Idlist agent, files, *preferred; | |
1033 | Key *key; | |
1034 | AuthenticationConnection *ac; | |
1035 | char *comment; | |
1036 | int i, found; | |
1037 | ||
1038 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1039 | TAILQ_INIT(&files); /* keys from the config file */ | |
1040 | preferred = &authctxt->keys; | |
1041 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1042 | ||
1043 | /* list of keys stored in the filesystem */ | |
1044 | for (i = 0; i < options.num_identity_files; i++) { | |
1045 | key = options.identity_keys[i]; | |
1046 | if (key && key->type == KEY_RSA1) | |
1047 | continue; | |
1048 | options.identity_keys[i] = NULL; | |
52e3daed | 1049 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1050 | id->key = key; |
1051 | id->filename = xstrdup(options.identity_files[i]); | |
1052 | TAILQ_INSERT_TAIL(&files, id, next); | |
1053 | } | |
1054 | /* list of keys supported by the agent */ | |
1055 | if ((ac = ssh_get_authentication_connection())) { | |
1056 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1057 | key != NULL; | |
1058 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1059 | found = 0; | |
1060 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1061 | /* agent keys from the config file are preferred */ |
43348518 | 1062 | if (key_equal(key, id->key)) { |
1063 | key_free(key); | |
1064 | xfree(comment); | |
1065 | TAILQ_REMOVE(&files, id, next); | |
1066 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1067 | id->ac = ac; | |
1068 | found = 1; | |
1069 | break; | |
1070 | } | |
1071 | } | |
3a065ed0 | 1072 | if (!found && !options.identities_only) { |
52e3daed | 1073 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1074 | id->key = key; |
1075 | id->filename = comment; | |
1076 | id->ac = ac; | |
1077 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1078 | } | |
1079 | } | |
1080 | /* append remaining agent keys */ | |
1081 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1082 | TAILQ_REMOVE(&agent, id, next); | |
1083 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1084 | } | |
1085 | authctxt->agent = ac; | |
1086 | } | |
1087 | /* append remaining keys from the config file */ | |
1088 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1089 | TAILQ_REMOVE(&files, id, next); | |
1090 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1091 | } | |
1092 | TAILQ_FOREACH(id, preferred, next) { | |
1093 | debug2("key: %s (%p)", id->filename, id->key); | |
1094 | } | |
fee56204 | 1095 | } |
1096 | ||
43348518 | 1097 | static void |
1098 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1099 | { |
43348518 | 1100 | Identity *id; |
1101 | ||
1102 | if (authctxt->agent != NULL) | |
1103 | ssh_close_authentication_connection(authctxt->agent); | |
1104 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1105 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1106 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1107 | if (id->key) | |
1108 | key_free(id->key); | |
1109 | if (id->filename) | |
1110 | xfree(id->filename); | |
1111 | xfree(id); | |
2e73a022 | 1112 | } |
a306f2dd | 1113 | } |
1114 | ||
188adeb2 | 1115 | int |
1116 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1117 | { |
43348518 | 1118 | Identity *id; |
188adeb2 | 1119 | int sent = 0; |
1120 | ||
43348518 | 1121 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1122 | if (id->tried++) | |
1123 | return (0); | |
b56e99e2 | 1124 | /* move key to the end of the queue */ |
43348518 | 1125 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1126 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1127 | /* | |
1128 | * send a test message if we have the public key. for | |
1129 | * encrypted keys we cannot do this and have to load the | |
1130 | * private key instead | |
1131 | */ | |
1132 | if (id->key && id->key->type != KEY_RSA1) { | |
1133 | debug("Offering public key: %s", id->filename); | |
1134 | sent = send_pubkey_test(authctxt, id); | |
1135 | } else if (id->key == NULL) { | |
1136 | debug("Trying private key: %s", id->filename); | |
1137 | id->key = load_identity_file(id->filename); | |
1138 | if (id->key != NULL) { | |
1139 | id->isprivate = 1; | |
1140 | sent = sign_and_send_pubkey(authctxt, id); | |
1141 | key_free(id->key); | |
1142 | id->key = NULL; | |
fee56204 | 1143 | } |
fee56204 | 1144 | } |
43348518 | 1145 | if (sent) |
1146 | return (sent); | |
fa08c86b | 1147 | } |
43348518 | 1148 | return (0); |
188adeb2 | 1149 | } |
a306f2dd | 1150 | |
94ec8c6b | 1151 | /* |
1152 | * Send userauth request message specifying keyboard-interactive method. | |
1153 | */ | |
1154 | int | |
1155 | userauth_kbdint(Authctxt *authctxt) | |
1156 | { | |
1157 | static int attempt = 0; | |
1158 | ||
1159 | if (attempt++ >= options.number_of_password_prompts) | |
1160 | return 0; | |
6b759005 | 1161 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1162 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1163 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1164 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1165 | return 0; | |
1166 | } | |
94ec8c6b | 1167 | |
1168 | debug2("userauth_kbdint"); | |
1169 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1170 | packet_put_cstring(authctxt->server_user); | |
1171 | packet_put_cstring(authctxt->service); | |
1172 | packet_put_cstring(authctxt->method->name); | |
1173 | packet_put_cstring(""); /* lang */ | |
1174 | packet_put_cstring(options.kbd_interactive_devices ? | |
1175 | options.kbd_interactive_devices : ""); | |
1176 | packet_send(); | |
94ec8c6b | 1177 | |
1178 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1179 | return 1; | |
1180 | } | |
1181 | ||
1182 | /* | |
f72e01a5 | 1183 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1184 | */ |
1185 | void | |
7819b5c3 | 1186 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1187 | { |
1188 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1189 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1190 | u_int num_prompts, i; |
94ec8c6b | 1191 | int echo = 0; |
1192 | ||
1193 | debug2("input_userauth_info_req"); | |
1194 | ||
1195 | if (authctxt == NULL) | |
1196 | fatal("input_userauth_info_req: no authentication context"); | |
1197 | ||
6b759005 | 1198 | authctxt->info_req_seen = 1; |
1199 | ||
94ec8c6b | 1200 | name = packet_get_string(NULL); |
1201 | inst = packet_get_string(NULL); | |
1202 | lang = packet_get_string(NULL); | |
94ec8c6b | 1203 | if (strlen(name) > 0) |
bbe88b6d | 1204 | logit("%s", name); |
94ec8c6b | 1205 | if (strlen(inst) > 0) |
bbe88b6d | 1206 | logit("%s", inst); |
f72e01a5 | 1207 | xfree(name); |
94ec8c6b | 1208 | xfree(inst); |
f72e01a5 | 1209 | xfree(lang); |
94ec8c6b | 1210 | |
1211 | num_prompts = packet_get_int(); | |
1212 | /* | |
1213 | * Begin to build info response packet based on prompts requested. | |
1214 | * We commit to providing the correct number of responses, so if | |
1215 | * further on we run into a problem that prevents this, we have to | |
1216 | * be sure and clean this up and send a correct error response. | |
1217 | */ | |
1218 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1219 | packet_put_int(num_prompts); | |
1220 | ||
5ba55ada | 1221 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1222 | for (i = 0; i < num_prompts; i++) { |
1223 | prompt = packet_get_string(NULL); | |
1224 | echo = packet_get_char(); | |
1225 | ||
1843a425 | 1226 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1227 | |
a6215e53 | 1228 | packet_put_cstring(response); |
94ec8c6b | 1229 | memset(response, 0, strlen(response)); |
1230 | xfree(response); | |
1231 | xfree(prompt); | |
1232 | } | |
95500969 | 1233 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1234 | |
b4b701be | 1235 | packet_add_padding(64); |
94ec8c6b | 1236 | packet_send(); |
94ec8c6b | 1237 | } |
a306f2dd | 1238 | |
39c00dc2 | 1239 | static int |
d6133f43 | 1240 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1241 | u_char *data, u_int datalen) |
1242 | { | |
1243 | Buffer b; | |
7091a26b | 1244 | struct stat st; |
39c00dc2 | 1245 | pid_t pid; |
d4826734 | 1246 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1247 | |
6226a8f8 | 1248 | debug2("ssh_keysign called"); |
39c00dc2 | 1249 | |
7091a26b | 1250 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1251 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1252 | return -1; | |
1253 | } | |
39c00dc2 | 1254 | if (fflush(stdout) != 0) |
1255 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1256 | if (pipe(to) < 0) { | |
1257 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1258 | return -1; | |
1259 | } | |
1260 | if (pipe(from) < 0) { | |
1261 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1262 | return -1; | |
1263 | } | |
1264 | if ((pid = fork()) < 0) { | |
1265 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1266 | return -1; | |
1267 | } | |
1268 | if (pid == 0) { | |
3c33c1b6 | 1269 | permanently_drop_suid(getuid()); |
39c00dc2 | 1270 | close(from[0]); |
1271 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1272 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1273 | close(to[1]); | |
1274 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1275 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1276 | close(from[1]); |
1277 | close(to[0]); | |
a3f69458 | 1278 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1279 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1280 | strerror(errno)); | |
1281 | } | |
1282 | close(from[1]); | |
1283 | close(to[0]); | |
1284 | ||
1285 | buffer_init(&b); | |
d4826734 | 1286 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1287 | buffer_put_string(&b, data, datalen); |
d3cbe6f8 | 1288 | if (ssh_msg_send(to[1], version, &b) == -1) |
1289 | fatal("ssh_keysign: couldn't send request"); | |
39c00dc2 | 1290 | |
e987fdbe | 1291 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1292 | error("ssh_keysign: no reply"); |
43f7a4b8 | 1293 | buffer_free(&b); |
39c00dc2 | 1294 | return -1; |
1295 | } | |
39c00dc2 | 1296 | close(from[0]); |
1297 | close(to[1]); | |
1298 | ||
d4826734 | 1299 | while (waitpid(pid, &status, 0) < 0) |
1300 | if (errno != EINTR) | |
1301 | break; | |
39c00dc2 | 1302 | |
7091a26b | 1303 | if (buffer_get_char(&b) != version) { |
1304 | error("ssh_keysign: bad version"); | |
43f7a4b8 | 1305 | buffer_free(&b); |
7091a26b | 1306 | return -1; |
1307 | } | |
1308 | *sigp = buffer_get_string(&b, lenp); | |
43f7a4b8 | 1309 | buffer_free(&b); |
7091a26b | 1310 | |
39c00dc2 | 1311 | return 0; |
1312 | } | |
1313 | ||
8002af61 | 1314 | int |
1315 | userauth_hostbased(Authctxt *authctxt) | |
1316 | { | |
1317 | Key *private = NULL; | |
39c00dc2 | 1318 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1319 | Buffer b; |
1320 | u_char *signature, *blob; | |
7fd1deb2 | 1321 | char *chost, *pkalg, *p, myname[NI_MAXHOST]; |
8dddf799 | 1322 | const char *service; |
8002af61 | 1323 | u_int blen, slen; |
f98c3421 | 1324 | int ok, i, len, found = 0; |
8002af61 | 1325 | |
8002af61 | 1326 | /* check for a useful key */ |
39c00dc2 | 1327 | for (i = 0; i < sensitive->nkeys; i++) { |
1328 | private = sensitive->keys[i]; | |
8002af61 | 1329 | if (private && private->type != KEY_RSA1) { |
1330 | found = 1; | |
1331 | /* we take and free the key */ | |
39c00dc2 | 1332 | sensitive->keys[i] = NULL; |
8002af61 | 1333 | break; |
1334 | } | |
1335 | } | |
1336 | if (!found) { | |
6226a8f8 | 1337 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1338 | return 0; |
1339 | } | |
1340 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1341 | key_free(private); | |
8002af61 | 1342 | return 0; |
1343 | } | |
e8d59b4d | 1344 | /* figure out a name for the client host */ |
7fd1deb2 | 1345 | p = NULL; |
1346 | if (packet_connection_is_on_socket()) | |
1347 | p = get_local_name(packet_get_connection_in()); | |
1348 | if (p == NULL) { | |
1349 | if (gethostname(myname, sizeof(myname)) == -1) { | |
1350 | verbose("userauth_hostbased: gethostname: %s", | |
1351 | strerror(errno)); | |
1352 | } else | |
1353 | p = xstrdup(myname); | |
1354 | } | |
e8d59b4d | 1355 | if (p == NULL) { |
1356 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1357 | key_free(private); | |
18fc231c | 1358 | xfree(blob); |
e8d59b4d | 1359 | return 0; |
1360 | } | |
1361 | len = strlen(p) + 2; | |
52e3daed | 1362 | xasprintf(&chost, "%s.", p); |
e8d59b4d | 1363 | debug2("userauth_hostbased: chost %s", chost); |
3e2f2431 | 1364 | xfree(p); |
e8d59b4d | 1365 | |
8dddf799 | 1366 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1367 | authctxt->service; | |
8002af61 | 1368 | pkalg = xstrdup(key_ssh_name(private)); |
1369 | buffer_init(&b); | |
8002af61 | 1370 | /* construct data */ |
8dddf799 | 1371 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1372 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1373 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1374 | buffer_put_cstring(&b, service); |
8002af61 | 1375 | buffer_put_cstring(&b, authctxt->method->name); |
1376 | buffer_put_cstring(&b, pkalg); | |
1377 | buffer_put_string(&b, blob, blen); | |
1378 | buffer_put_cstring(&b, chost); | |
1379 | buffer_put_cstring(&b, authctxt->local_user); | |
1380 | #ifdef DEBUG_PK | |
1381 | buffer_dump(&b); | |
1382 | #endif | |
39c00dc2 | 1383 | if (sensitive->external_keysign) |
1384 | ok = ssh_keysign(private, &signature, &slen, | |
1385 | buffer_ptr(&b), buffer_len(&b)); | |
1386 | else | |
1387 | ok = key_sign(private, &signature, &slen, | |
1388 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1389 | key_free(private); |
1390 | buffer_free(&b); | |
1391 | if (ok != 0) { | |
1392 | error("key_sign failed"); | |
1393 | xfree(chost); | |
1394 | xfree(pkalg); | |
18fc231c | 1395 | xfree(blob); |
8002af61 | 1396 | return 0; |
1397 | } | |
1398 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1399 | packet_put_cstring(authctxt->server_user); | |
1400 | packet_put_cstring(authctxt->service); | |
1401 | packet_put_cstring(authctxt->method->name); | |
1402 | packet_put_cstring(pkalg); | |
1403 | packet_put_string(blob, blen); | |
1404 | packet_put_cstring(chost); | |
1405 | packet_put_cstring(authctxt->local_user); | |
1406 | packet_put_string(signature, slen); | |
1407 | memset(signature, 's', slen); | |
1408 | xfree(signature); | |
1409 | xfree(chost); | |
1410 | xfree(pkalg); | |
18fc231c | 1411 | xfree(blob); |
8002af61 | 1412 | |
1413 | packet_send(); | |
1414 | return 1; | |
1415 | } | |
1416 | ||
188adeb2 | 1417 | /* find auth method */ |
1418 | ||
188adeb2 | 1419 | /* |
1420 | * given auth method name, if configurable options permit this method fill | |
1421 | * in auth_ident field and return true, otherwise return false. | |
1422 | */ | |
396c147e | 1423 | static int |
188adeb2 | 1424 | authmethod_is_enabled(Authmethod *method) |
1425 | { | |
1426 | if (method == NULL) | |
1427 | return 0; | |
1428 | /* return false if options indicate this method is disabled */ | |
1429 | if (method->enabled == NULL || *method->enabled == 0) | |
1430 | return 0; | |
1431 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1432 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1433 | return 0; | |
1434 | return 1; | |
1435 | } | |
a306f2dd | 1436 | |
396c147e | 1437 | static Authmethod * |
188adeb2 | 1438 | authmethod_lookup(const char *name) |
1439 | { | |
1440 | Authmethod *method = NULL; | |
1441 | if (name != NULL) | |
1442 | for (method = authmethods; method->name != NULL; method++) | |
1443 | if (strcmp(name, method->name) == 0) | |
1444 | return method; | |
1445 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1446 | return NULL; | |
1447 | } | |
1448 | ||
cab80f75 | 1449 | /* XXX internal state */ |
1450 | static Authmethod *current = NULL; | |
1451 | static char *supported = NULL; | |
1452 | static char *preferred = NULL; | |
d6133f43 | 1453 | |
188adeb2 | 1454 | /* |
1455 | * Given the authentication method list sent by the server, return the | |
1456 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1457 | * use a built-in default list. |
2b87da3b | 1458 | */ |
396c147e | 1459 | static Authmethod * |
188adeb2 | 1460 | authmethod_get(char *authlist) |
1461 | { | |
cab80f75 | 1462 | char *name = NULL; |
21b30f38 | 1463 | u_int next; |
2b87da3b | 1464 | |
188adeb2 | 1465 | /* Use a suitable default if we're passed a nil list. */ |
1466 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1467 | authlist = options.preferred_authentications; |
1468 | ||
1469 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1470 | debug3("start over, passed a different list %s", authlist); | |
1471 | if (supported != NULL) | |
1472 | xfree(supported); | |
1473 | supported = xstrdup(authlist); | |
1474 | preferred = options.preferred_authentications; | |
1475 | debug3("preferred %s", preferred); | |
1476 | current = NULL; | |
1477 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1478 | return current; | |
188adeb2 | 1479 | |
cab80f75 | 1480 | for (;;) { |
1481 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1482 | debug("No more authentication methods to try."); |
cab80f75 | 1483 | current = NULL; |
1484 | return NULL; | |
1485 | } | |
1486 | preferred += next; | |
94ec8c6b | 1487 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1488 | debug3("remaining preferred: %s", preferred); |
1489 | if ((current = authmethod_lookup(name)) != NULL && | |
1490 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1491 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1492 | debug("Next authentication method: %s", name); |
cab80f75 | 1493 | return current; |
94ec8c6b | 1494 | } |
a306f2dd | 1495 | } |
cab80f75 | 1496 | } |
a22aff1f | 1497 | |
ffb215be | 1498 | static char * |
cab80f75 | 1499 | authmethods_get(void) |
1500 | { | |
1501 | Authmethod *method = NULL; | |
3469eac4 | 1502 | Buffer b; |
1503 | char *list; | |
cab80f75 | 1504 | |
3469eac4 | 1505 | buffer_init(&b); |
cab80f75 | 1506 | for (method = authmethods; method->name != NULL; method++) { |
1507 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1508 | if (buffer_len(&b) > 0) |
1509 | buffer_append(&b, ",", 1); | |
1510 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1511 | } |
1512 | } | |
3469eac4 | 1513 | buffer_append(&b, "\0", 1); |
1514 | list = xstrdup(buffer_ptr(&b)); | |
1515 | buffer_free(&b); | |
1516 | return list; | |
a306f2dd | 1517 | } |