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a306f2dd | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
a306f2dd | 12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | #include "includes.h" | |
7364bd04 | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.121 2003/08/22 10:56:09 markus Exp $"); |
802e01b8 | 27 | |
28 | #ifdef KRB5 | |
29 | #include <krb5.h> | |
751092f9 | 30 | #ifndef HEIMDAL |
31 | #define krb5_get_err_text(context,code) error_message(code) | |
32 | #endif /* !HEIMDAL */ | |
802e01b8 | 33 | #endif |
a306f2dd | 34 | |
751092f9 | 35 | #include "openbsd-compat/sys-queue.h" |
36 | ||
a306f2dd | 37 | #include "ssh.h" |
42f11eb2 | 38 | #include "ssh2.h" |
a306f2dd | 39 | #include "xmalloc.h" |
a306f2dd | 40 | #include "buffer.h" |
41 | #include "packet.h" | |
a306f2dd | 42 | #include "compat.h" |
a306f2dd | 43 | #include "bufaux.h" |
42f11eb2 | 44 | #include "cipher.h" |
a306f2dd | 45 | #include "kex.h" |
46 | #include "myproposal.h" | |
a306f2dd | 47 | #include "sshconnect.h" |
48 | #include "authfile.h" | |
db1cd2f3 | 49 | #include "dh.h" |
2e73a022 | 50 | #include "authfd.h" |
42f11eb2 | 51 | #include "log.h" |
52 | #include "readconf.h" | |
53 | #include "readpass.h" | |
cab80f75 | 54 | #include "match.h" |
a5c9ffdb | 55 | #include "dispatch.h" |
8002af61 | 56 | #include "canohost.h" |
39c00dc2 | 57 | #include "msg.h" |
58 | #include "pathnames.h" | |
94ec8c6b | 59 | |
7364bd04 | 60 | #ifdef GSSAPI |
61 | #include "ssh-gss.h" | |
62 | #endif | |
63 | ||
a306f2dd | 64 | /* import */ |
65 | extern char *client_version_string; | |
66 | extern char *server_version_string; | |
67 | extern Options options; | |
68 | ||
69 | /* | |
70 | * SSH2 key exchange | |
71 | */ | |
72 | ||
1e3b8b07 | 73 | u_char *session_id2 = NULL; |
a27002e5 | 74 | u_int session_id2_len = 0; |
a306f2dd | 75 | |
a5c9ffdb | 76 | char *xxx_host; |
77 | struct sockaddr *xxx_hostaddr; | |
78 | ||
e092ce67 | 79 | Kex *xxx_kex = NULL; |
80 | ||
396c147e | 81 | static int |
f49bc4f7 | 82 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 83 | { |
f49bc4f7 | 84 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 85 | fatal("Host key verification failed."); |
a5c9ffdb | 86 | return 0; |
87 | } | |
88 | ||
a306f2dd | 89 | void |
94ec8c6b | 90 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
91 | { | |
94ec8c6b | 92 | Kex *kex; |
a5c9ffdb | 93 | |
94 | xxx_host = host; | |
95 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 96 | |
c523303b | 97 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 98 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 99 | options.ciphers = NULL; |
94ec8c6b | 100 | } |
101 | if (options.ciphers != NULL) { | |
102 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
103 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
104 | } | |
1ad64a93 | 105 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
106 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
107 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
108 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 109 | if (options.compression) { |
b2552997 | 110 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
713f6cd9 | 111 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none"; |
94ec8c6b | 112 | } else { |
b2552997 | 113 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
713f6cd9 | 114 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib"; |
94ec8c6b | 115 | } |
b2552997 | 116 | if (options.macs != NULL) { |
117 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
118 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
119 | } | |
e961a8f9 | 120 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 121 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 122 | options.hostkeyalgorithms; |
94ec8c6b | 123 | |
ffd7b36b | 124 | if (options.rekey_limit) |
125 | packet_set_rekey_limit(options.rekey_limit); | |
126 | ||
7a37c112 | 127 | /* start key exchange */ |
d8ee838b | 128 | kex = kex_setup(myproposal); |
98a58eda | 129 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
130 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
a5c9ffdb | 131 | kex->client_version_string=client_version_string; |
132 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 133 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 134 | |
e092ce67 | 135 | xxx_kex = kex; |
136 | ||
c422989b | 137 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 138 | |
d1ac6175 | 139 | session_id2 = kex->session_id; |
140 | session_id2_len = kex->session_id_len; | |
141 | ||
94ec8c6b | 142 | #ifdef DEBUG_KEXDH |
143 | /* send 1st encrypted/maced/compressed message */ | |
144 | packet_start(SSH2_MSG_IGNORE); | |
145 | packet_put_cstring("markus"); | |
146 | packet_send(); | |
147 | packet_write_wait(); | |
148 | #endif | |
a306f2dd | 149 | } |
71276795 | 150 | |
a306f2dd | 151 | /* |
152 | * Authenticate user | |
153 | */ | |
188adeb2 | 154 | |
155 | typedef struct Authctxt Authctxt; | |
156 | typedef struct Authmethod Authmethod; | |
43348518 | 157 | typedef struct identity Identity; |
158 | typedef struct idlist Idlist; | |
159 | ||
160 | struct identity { | |
161 | TAILQ_ENTRY(identity) next; | |
162 | AuthenticationConnection *ac; /* set if agent supports key */ | |
163 | Key *key; /* public/private key */ | |
164 | char *filename; /* comment for agent-only keys */ | |
165 | int tried; | |
166 | int isprivate; /* key points to the private key */ | |
167 | }; | |
168 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 169 | |
170 | struct Authctxt { | |
171 | const char *server_user; | |
8002af61 | 172 | const char *local_user; |
188adeb2 | 173 | const char *host; |
174 | const char *service; | |
188adeb2 | 175 | Authmethod *method; |
94ec8c6b | 176 | int success; |
fee56204 | 177 | char *authlist; |
8002af61 | 178 | /* pubkey */ |
43348518 | 179 | Idlist keys; |
8002af61 | 180 | AuthenticationConnection *agent; |
181 | /* hostbased */ | |
39c00dc2 | 182 | Sensitive *sensitive; |
6b759005 | 183 | /* kbd-interactive */ |
184 | int info_req_seen; | |
7364bd04 | 185 | /* generic */ |
186 | void *methoddata; | |
188adeb2 | 187 | }; |
188 | struct Authmethod { | |
189 | char *name; /* string to compare against server's list */ | |
190 | int (*userauth)(Authctxt *authctxt); | |
191 | int *enabled; /* flag in option struct that enables method */ | |
192 | int *batch_flag; /* flag in option struct that disables method */ | |
193 | }; | |
194 | ||
7819b5c3 | 195 | void input_userauth_success(int, u_int32_t, void *); |
196 | void input_userauth_failure(int, u_int32_t, void *); | |
197 | void input_userauth_banner(int, u_int32_t, void *); | |
198 | void input_userauth_error(int, u_int32_t, void *); | |
199 | void input_userauth_info_req(int, u_int32_t, void *); | |
200 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 201 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 202 | |
d5bb9418 | 203 | int userauth_none(Authctxt *); |
204 | int userauth_pubkey(Authctxt *); | |
205 | int userauth_passwd(Authctxt *); | |
206 | int userauth_kbdint(Authctxt *); | |
207 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 208 | int userauth_kerberos(Authctxt *); |
188adeb2 | 209 | |
7364bd04 | 210 | #ifdef GSSAPI |
211 | int userauth_gssapi(Authctxt *authctxt); | |
212 | void input_gssapi_response(int type, u_int32_t, void *); | |
213 | void input_gssapi_token(int type, u_int32_t, void *); | |
214 | void input_gssapi_hash(int type, u_int32_t, void *); | |
215 | void input_gssapi_error(int, u_int32_t, void *); | |
216 | void input_gssapi_errtok(int, u_int32_t, void *); | |
217 | #endif | |
218 | ||
d5bb9418 | 219 | void userauth(Authctxt *, char *); |
fee56204 | 220 | |
43348518 | 221 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 222 | static void pubkey_prepare(Authctxt *); |
223 | static void pubkey_cleanup(Authctxt *); | |
224 | static Key *load_identity_file(char *); | |
fee56204 | 225 | |
396c147e | 226 | static Authmethod *authmethod_get(char *authlist); |
227 | static Authmethod *authmethod_lookup(const char *name); | |
228 | static char *authmethods_get(void); | |
188adeb2 | 229 | |
230 | Authmethod authmethods[] = { | |
7364bd04 | 231 | #ifdef GSSAPI |
232 | {"gssapi", | |
233 | userauth_gssapi, | |
234 | &options.gss_authentication, | |
235 | NULL}, | |
236 | #endif | |
3398dda9 | 237 | {"hostbased", |
238 | userauth_hostbased, | |
239 | &options.hostbased_authentication, | |
240 | NULL}, | |
802e01b8 | 241 | #if KRB5 |
242 | {"kerberos-2@ssh.com", | |
243 | userauth_kerberos, | |
244 | &options.kerberos_authentication, | |
245 | NULL}, | |
246 | #endif | |
9f37c0af | 247 | {"publickey", |
248 | userauth_pubkey, | |
249 | &options.pubkey_authentication, | |
250 | NULL}, | |
94ec8c6b | 251 | {"keyboard-interactive", |
252 | userauth_kbdint, | |
253 | &options.kbd_interactive_authentication, | |
254 | &options.batch_mode}, | |
9f37c0af | 255 | {"password", |
256 | userauth_passwd, | |
257 | &options.password_authentication, | |
258 | &options.batch_mode}, | |
94ec8c6b | 259 | {"none", |
260 | userauth_none, | |
261 | NULL, | |
262 | NULL}, | |
188adeb2 | 263 | {NULL, NULL, NULL, NULL} |
264 | }; | |
265 | ||
266 | void | |
8002af61 | 267 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 268 | Sensitive *sensitive) |
188adeb2 | 269 | { |
270 | Authctxt authctxt; | |
271 | int type; | |
188adeb2 | 272 | |
5ba55ada | 273 | if (options.challenge_response_authentication) |
d464095c | 274 | options.kbd_interactive_authentication = 1; |
275 | ||
188adeb2 | 276 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
277 | packet_put_cstring("ssh-userauth"); | |
278 | packet_send(); | |
a77673cc | 279 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 280 | packet_write_wait(); |
54a5250f | 281 | type = packet_read(); |
a77673cc | 282 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
283 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 284 | if (packet_remaining() > 0) { |
54a5250f | 285 | char *reply = packet_get_string(NULL); |
a77673cc | 286 | debug2("service_accept: %s", reply); |
188adeb2 | 287 | xfree(reply); |
188adeb2 | 288 | } else { |
6226a8f8 | 289 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 290 | } |
95500969 | 291 | packet_check_eom(); |
a77673cc | 292 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 293 | |
cab80f75 | 294 | if (options.preferred_authentications == NULL) |
295 | options.preferred_authentications = authmethods_get(); | |
296 | ||
188adeb2 | 297 | /* setup authentication context */ |
6b759005 | 298 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 299 | pubkey_prepare(&authctxt); |
188adeb2 | 300 | authctxt.server_user = server_user; |
8002af61 | 301 | authctxt.local_user = local_user; |
188adeb2 | 302 | authctxt.host = host; |
303 | authctxt.service = "ssh-connection"; /* service name */ | |
304 | authctxt.success = 0; | |
94ec8c6b | 305 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 306 | authctxt.authlist = NULL; |
7364bd04 | 307 | authctxt.methoddata = NULL; |
39c00dc2 | 308 | authctxt.sensitive = sensitive; |
6b759005 | 309 | authctxt.info_req_seen = 0; |
94ec8c6b | 310 | if (authctxt.method == NULL) |
311 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 312 | |
313 | /* initial userauth request */ | |
94ec8c6b | 314 | userauth_none(&authctxt); |
188adeb2 | 315 | |
7a37c112 | 316 | dispatch_init(&input_userauth_error); |
188adeb2 | 317 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
318 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 319 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 320 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
321 | ||
43348518 | 322 | pubkey_cleanup(&authctxt); |
b8c2031b | 323 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
324 | ||
6226a8f8 | 325 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 326 | } |
b8c2031b | 327 | |
188adeb2 | 328 | void |
fee56204 | 329 | userauth(Authctxt *authctxt, char *authlist) |
330 | { | |
7364bd04 | 331 | if (authctxt->methoddata) { |
332 | xfree(authctxt->methoddata); | |
333 | authctxt->methoddata = NULL; | |
334 | } | |
fee56204 | 335 | if (authlist == NULL) { |
336 | authlist = authctxt->authlist; | |
337 | } else { | |
338 | if (authctxt->authlist) | |
339 | xfree(authctxt->authlist); | |
340 | authctxt->authlist = authlist; | |
341 | } | |
342 | for (;;) { | |
343 | Authmethod *method = authmethod_get(authlist); | |
344 | if (method == NULL) | |
345 | fatal("Permission denied (%s).", authlist); | |
346 | authctxt->method = method; | |
b8c2031b | 347 | |
348 | /* reset the per method handler */ | |
349 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
350 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
351 | ||
352 | /* and try new method */ | |
fee56204 | 353 | if (method->userauth(authctxt) != 0) { |
354 | debug2("we sent a %s packet, wait for reply", method->name); | |
355 | break; | |
356 | } else { | |
357 | debug2("we did not send a packet, disable method"); | |
358 | method->enabled = NULL; | |
359 | } | |
360 | } | |
361 | } | |
d6133f43 | 362 | |
fee56204 | 363 | void |
7819b5c3 | 364 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 365 | { |
9616313f | 366 | fatal("input_userauth_error: bad message during authentication: " |
367 | "type %d", type); | |
368 | } | |
d6133f43 | 369 | |
9616313f | 370 | void |
7819b5c3 | 371 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 372 | { |
373 | char *msg, *lang; | |
374 | debug3("input_userauth_banner"); | |
375 | msg = packet_get_string(NULL); | |
376 | lang = packet_get_string(NULL); | |
377 | fprintf(stderr, "%s", msg); | |
378 | xfree(msg); | |
379 | xfree(lang); | |
188adeb2 | 380 | } |
d6133f43 | 381 | |
188adeb2 | 382 | void |
7819b5c3 | 383 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 384 | { |
385 | Authctxt *authctxt = ctxt; | |
386 | if (authctxt == NULL) | |
387 | fatal("input_userauth_success: no authentication context"); | |
fee56204 | 388 | if (authctxt->authlist) |
389 | xfree(authctxt->authlist); | |
7364bd04 | 390 | if (authctxt->methoddata) |
391 | xfree(authctxt->methoddata); | |
188adeb2 | 392 | authctxt->success = 1; /* break out */ |
393 | } | |
d6133f43 | 394 | |
188adeb2 | 395 | void |
7819b5c3 | 396 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 397 | { |
188adeb2 | 398 | Authctxt *authctxt = ctxt; |
399 | char *authlist = NULL; | |
400 | int partial; | |
188adeb2 | 401 | |
402 | if (authctxt == NULL) | |
403 | fatal("input_userauth_failure: no authentication context"); | |
404 | ||
94ec8c6b | 405 | authlist = packet_get_string(NULL); |
188adeb2 | 406 | partial = packet_get_char(); |
95500969 | 407 | packet_check_eom(); |
188adeb2 | 408 | |
409 | if (partial != 0) | |
bbe88b6d | 410 | logit("Authenticated with partial success."); |
6226a8f8 | 411 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 412 | |
fee56204 | 413 | userauth(authctxt, authlist); |
414 | } | |
415 | void | |
7819b5c3 | 416 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 417 | { |
418 | Authctxt *authctxt = ctxt; | |
419 | Key *key = NULL; | |
43348518 | 420 | Identity *id = NULL; |
fee56204 | 421 | Buffer b; |
c66f9d0e | 422 | int pktype, sent = 0; |
423 | u_int alen, blen; | |
424 | char *pkalg, *fp; | |
425 | u_char *pkblob; | |
fee56204 | 426 | |
427 | if (authctxt == NULL) | |
428 | fatal("input_userauth_pk_ok: no authentication context"); | |
429 | if (datafellows & SSH_BUG_PKOK) { | |
430 | /* this is similar to SSH_BUG_PKAUTH */ | |
431 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
432 | pkblob = packet_get_string(&blen); | |
433 | buffer_init(&b); | |
434 | buffer_append(&b, pkblob, blen); | |
435 | pkalg = buffer_get_string(&b, &alen); | |
436 | buffer_free(&b); | |
437 | } else { | |
438 | pkalg = packet_get_string(&alen); | |
439 | pkblob = packet_get_string(&blen); | |
440 | } | |
95500969 | 441 | packet_check_eom(); |
fee56204 | 442 | |
43348518 | 443 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 444 | |
43348518 | 445 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
446 | debug("unknown pkalg %s", pkalg); | |
447 | goto done; | |
448 | } | |
449 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
450 | debug("no key from blob. pkalg %s", pkalg); | |
451 | goto done; | |
452 | } | |
453 | if (key->type != pktype) { | |
454 | error("input_userauth_pk_ok: type mismatch " | |
455 | "for decoded key (received %d, expected %d)", | |
456 | key->type, pktype); | |
457 | goto done; | |
458 | } | |
459 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
460 | debug2("input_userauth_pk_ok: fp %s", fp); | |
461 | xfree(fp); | |
462 | ||
463 | TAILQ_FOREACH(id, &authctxt->keys, next) { | |
464 | if (key_equal(key, id->key)) { | |
465 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 466 | break; |
467 | } | |
43348518 | 468 | } |
469 | done: | |
fee56204 | 470 | if (key != NULL) |
471 | key_free(key); | |
472 | xfree(pkalg); | |
473 | xfree(pkblob); | |
474 | ||
343288b8 | 475 | /* try another method if we did not send a packet */ |
fee56204 | 476 | if (sent == 0) |
477 | userauth(authctxt, NULL); | |
188adeb2 | 478 | } |
479 | ||
7364bd04 | 480 | #ifdef GSSAPI |
481 | int | |
482 | userauth_gssapi(Authctxt *authctxt) | |
483 | { | |
484 | Gssctxt *gssctxt = NULL; | |
485 | static gss_OID_set supported = NULL; | |
486 | static int mech = 0; | |
487 | OM_uint32 min; | |
488 | int ok = 0; | |
489 | ||
490 | /* Try one GSSAPI method at a time, rather than sending them all at | |
491 | * once. */ | |
492 | ||
493 | if (supported == NULL) | |
494 | gss_indicate_mechs(&min, &supported); | |
495 | ||
496 | /* Check to see if the mechanism is usable before we offer it */ | |
497 | while (mech<supported->count && !ok) { | |
498 | if (gssctxt) | |
499 | ssh_gssapi_delete_ctx(&gssctxt); | |
500 | ssh_gssapi_build_ctx(&gssctxt); | |
501 | ssh_gssapi_set_oid(gssctxt, &supported->elements[mech]); | |
502 | ||
503 | /* My DER encoding requires length<128 */ | |
504 | if (supported->elements[mech].length < 128 && | |
505 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, | |
506 | authctxt->host))) { | |
507 | ok = 1; /* Mechanism works */ | |
508 | } else { | |
509 | mech++; | |
510 | } | |
511 | } | |
512 | ||
513 | if (!ok) return 0; | |
514 | ||
515 | authctxt->methoddata=(void *)gssctxt; | |
516 | ||
517 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
518 | packet_put_cstring(authctxt->server_user); | |
519 | packet_put_cstring(authctxt->service); | |
520 | packet_put_cstring(authctxt->method->name); | |
521 | ||
522 | packet_put_int(1); | |
523 | ||
524 | /* Some servers encode the OID incorrectly (as we used to) */ | |
525 | if (datafellows & SSH_BUG_GSSAPI_BER) { | |
526 | packet_put_string(supported->elements[mech].elements, | |
527 | supported->elements[mech].length); | |
528 | } else { | |
529 | packet_put_int((supported->elements[mech].length)+2); | |
530 | packet_put_char(SSH_GSS_OIDTYPE); | |
531 | packet_put_char(supported->elements[mech].length); | |
532 | packet_put_raw(supported->elements[mech].elements, | |
533 | supported->elements[mech].length); | |
534 | } | |
535 | ||
536 | packet_send(); | |
537 | ||
538 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
539 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
540 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
541 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
542 | ||
543 | mech++; /* Move along to next candidate */ | |
544 | ||
545 | return 1; | |
546 | } | |
547 | ||
548 | void | |
549 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
550 | { | |
551 | Authctxt *authctxt = ctxt; | |
552 | Gssctxt *gssctxt; | |
553 | OM_uint32 status, ms; | |
554 | int oidlen; | |
555 | char *oidv; | |
556 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
557 | ||
558 | if (authctxt == NULL) | |
559 | fatal("input_gssapi_response: no authentication context"); | |
560 | gssctxt = authctxt->methoddata; | |
561 | ||
562 | /* Setup our OID */ | |
563 | oidv = packet_get_string(&oidlen); | |
564 | ||
565 | if (datafellows & SSH_BUG_GSSAPI_BER) { | |
566 | if (!ssh_gssapi_check_oid(gssctxt, oidv, oidlen)) | |
567 | fatal("Server returned different OID than expected"); | |
568 | } else { | |
569 | if(oidv[0] != SSH_GSS_OIDTYPE || oidv[1] != oidlen-2) { | |
570 | debug("Badly encoded mechanism OID received"); | |
571 | userauth(authctxt, NULL); | |
572 | xfree(oidv); | |
573 | return; | |
574 | } | |
575 | if (!ssh_gssapi_check_oid(gssctxt, oidv+2, oidlen-2)) | |
576 | fatal("Server returned different OID than expected"); | |
577 | } | |
578 | ||
579 | packet_check_eom(); | |
580 | ||
581 | xfree(oidv); | |
582 | ||
583 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
584 | GSS_C_NO_BUFFER, &send_tok, NULL); | |
585 | if (GSS_ERROR(status)) { | |
586 | if (send_tok.length > 0) { | |
587 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
588 | packet_put_string(send_tok.value, send_tok.length); | |
589 | packet_send(); | |
590 | gss_release_buffer(&ms, &send_tok); | |
591 | } | |
592 | /* Start again with next method on list */ | |
593 | debug("Trying to start again"); | |
594 | userauth(authctxt, NULL); | |
595 | return; | |
596 | } | |
597 | ||
598 | /* We must have data to send */ | |
599 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
600 | packet_put_string(send_tok.value, send_tok.length); | |
601 | packet_send(); | |
602 | gss_release_buffer(&ms, &send_tok); | |
603 | } | |
604 | ||
605 | void | |
606 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
607 | { | |
608 | Authctxt *authctxt = ctxt; | |
609 | Gssctxt *gssctxt; | |
610 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
611 | gss_buffer_desc recv_tok; | |
612 | OM_uint32 status, ms; | |
613 | u_int slen; | |
614 | ||
615 | if (authctxt == NULL) | |
616 | fatal("input_gssapi_response: no authentication context"); | |
617 | gssctxt = authctxt->methoddata; | |
618 | ||
619 | recv_tok.value = packet_get_string(&slen); | |
620 | recv_tok.length = slen; /* safe typecast */ | |
621 | ||
622 | packet_check_eom(); | |
623 | ||
624 | status=ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
625 | &recv_tok, &send_tok, NULL); | |
626 | ||
627 | xfree(recv_tok.value); | |
628 | ||
629 | if (GSS_ERROR(status)) { | |
630 | if (send_tok.length > 0) { | |
631 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
632 | packet_put_string(send_tok.value, send_tok.length); | |
633 | packet_send(); | |
634 | gss_release_buffer(&ms, &send_tok); | |
635 | } | |
636 | /* Start again with the next method in the list */ | |
637 | userauth(authctxt, NULL); | |
638 | return; | |
639 | } | |
640 | ||
641 | if (send_tok.length > 0) { | |
642 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
643 | packet_put_string(send_tok.value, send_tok.length); | |
644 | packet_send(); | |
645 | gss_release_buffer(&ms, &send_tok); | |
646 | } | |
647 | ||
648 | if (status == GSS_S_COMPLETE) { | |
649 | /* If that succeeded, send a exchange complete message */ | |
650 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
651 | packet_send(); | |
652 | } | |
653 | } | |
654 | ||
655 | void | |
656 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
657 | { | |
658 | Authctxt *authctxt = ctxt; | |
659 | Gssctxt *gssctxt; | |
660 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
661 | gss_buffer_desc recv_tok; | |
662 | OM_uint32 status, ms; | |
663 | ||
664 | if (authctxt == NULL) | |
665 | fatal("input_gssapi_response: no authentication context"); | |
666 | gssctxt = authctxt->methoddata; | |
667 | ||
668 | recv_tok.value = packet_get_string(&recv_tok.length); | |
669 | ||
670 | packet_check_eom(); | |
671 | ||
672 | /* Stick it into GSSAPI and see what it says */ | |
673 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
674 | &recv_tok, &send_tok, NULL); | |
675 | ||
676 | xfree(recv_tok.value); | |
677 | gss_release_buffer(&ms, &send_tok); | |
678 | ||
679 | /* Server will be returning a failed packet after this one */ | |
680 | } | |
681 | ||
682 | void | |
683 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
684 | { | |
685 | OM_uint32 maj, min; | |
686 | char *msg; | |
687 | char *lang; | |
688 | ||
689 | maj=packet_get_int(); | |
690 | min=packet_get_int(); | |
691 | msg=packet_get_string(NULL); | |
692 | lang=packet_get_string(NULL); | |
693 | ||
694 | packet_check_eom(); | |
695 | ||
696 | debug("Server GSSAPI Error:\n%s\n", msg); | |
697 | xfree(msg); | |
698 | xfree(lang); | |
699 | } | |
700 | #endif /* GSSAPI */ | |
701 | ||
94ec8c6b | 702 | int |
703 | userauth_none(Authctxt *authctxt) | |
704 | { | |
705 | /* initial userauth request */ | |
706 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
707 | packet_put_cstring(authctxt->server_user); | |
708 | packet_put_cstring(authctxt->service); | |
709 | packet_put_cstring(authctxt->method->name); | |
710 | packet_send(); | |
94ec8c6b | 711 | return 1; |
712 | } | |
713 | ||
a306f2dd | 714 | int |
188adeb2 | 715 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 716 | { |
1d1ffb87 | 717 | static int attempt = 0; |
67ec167d | 718 | char prompt[150]; |
a306f2dd | 719 | char *password; |
720 | ||
fa649821 | 721 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 722 | return 0; |
723 | ||
6aacefa7 | 724 | if (attempt != 1) |
fa649821 | 725 | error("Permission denied, please try again."); |
726 | ||
f72e01a5 | 727 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 728 | authctxt->server_user, authctxt->host); |
a306f2dd | 729 | password = read_passphrase(prompt, 0); |
730 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 731 | packet_put_cstring(authctxt->server_user); |
732 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 733 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 734 | packet_put_char(0); |
a6215e53 | 735 | packet_put_cstring(password); |
a306f2dd | 736 | memset(password, 0, strlen(password)); |
737 | xfree(password); | |
b4b701be | 738 | packet_add_padding(64); |
a306f2dd | 739 | packet_send(); |
67ec167d | 740 | |
7203d6bb | 741 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 742 | &input_userauth_passwd_changereq); |
743 | ||
a306f2dd | 744 | return 1; |
745 | } | |
67ec167d | 746 | /* |
747 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
748 | */ | |
749 | void | |
ef077e37 | 750 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 751 | { |
752 | Authctxt *authctxt = ctxt; | |
753 | char *info, *lang, *password = NULL, *retype = NULL; | |
754 | char prompt[150]; | |
755 | ||
756 | debug2("input_userauth_passwd_changereq"); | |
757 | ||
758 | if (authctxt == NULL) | |
759 | fatal("input_userauth_passwd_changereq: " | |
760 | "no authentication context"); | |
761 | ||
762 | info = packet_get_string(NULL); | |
763 | lang = packet_get_string(NULL); | |
764 | if (strlen(info) > 0) | |
bbe88b6d | 765 | logit("%s", info); |
67ec167d | 766 | xfree(info); |
767 | xfree(lang); | |
768 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
769 | packet_put_cstring(authctxt->server_user); | |
770 | packet_put_cstring(authctxt->service); | |
771 | packet_put_cstring(authctxt->method->name); | |
772 | packet_put_char(1); /* additional info */ | |
7203d6bb | 773 | snprintf(prompt, sizeof(prompt), |
67ec167d | 774 | "Enter %.30s@%.128s's old password: ", |
775 | authctxt->server_user, authctxt->host); | |
776 | password = read_passphrase(prompt, 0); | |
777 | packet_put_cstring(password); | |
778 | memset(password, 0, strlen(password)); | |
779 | xfree(password); | |
780 | password = NULL; | |
781 | while (password == NULL) { | |
7203d6bb | 782 | snprintf(prompt, sizeof(prompt), |
67ec167d | 783 | "Enter %.30s@%.128s's new password: ", |
784 | authctxt->server_user, authctxt->host); | |
785 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
786 | if (password == NULL) { | |
787 | /* bail out */ | |
788 | return; | |
789 | } | |
7203d6bb | 790 | snprintf(prompt, sizeof(prompt), |
67ec167d | 791 | "Retype %.30s@%.128s's new password: ", |
792 | authctxt->server_user, authctxt->host); | |
793 | retype = read_passphrase(prompt, 0); | |
794 | if (strcmp(password, retype) != 0) { | |
795 | memset(password, 0, strlen(password)); | |
796 | xfree(password); | |
bbe88b6d | 797 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 798 | password = NULL; |
799 | } | |
800 | memset(retype, 0, strlen(retype)); | |
801 | xfree(retype); | |
802 | } | |
803 | packet_put_cstring(password); | |
804 | memset(password, 0, strlen(password)); | |
805 | xfree(password); | |
806 | packet_add_padding(64); | |
807 | packet_send(); | |
7203d6bb | 808 | |
809 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 810 | &input_userauth_passwd_changereq); |
811 | } | |
a306f2dd | 812 | |
43348518 | 813 | static int |
814 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
815 | u_char *data, u_int datalen) | |
816 | { | |
817 | Key *prv; | |
818 | int ret; | |
819 | ||
820 | /* the agent supports this key */ | |
821 | if (id->ac) | |
822 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
823 | data, datalen)); | |
824 | /* | |
825 | * we have already loaded the private key or | |
826 | * the private key is stored in external hardware | |
827 | */ | |
828 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
829 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
830 | /* load the private key from the file */ | |
831 | if ((prv = load_identity_file(id->filename)) == NULL) | |
832 | return (-1); | |
833 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
834 | key_free(prv); | |
835 | return (ret); | |
fee56204 | 836 | } |
837 | ||
396c147e | 838 | static int |
43348518 | 839 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 840 | { |
841 | Buffer b; | |
1e3b8b07 | 842 | u_char *blob, *signature; |
c66f9d0e | 843 | u_int bloblen, slen; |
a27002e5 | 844 | u_int skip = 0; |
2e73a022 | 845 | int ret = -1; |
94ec8c6b | 846 | int have_sig = 1; |
a306f2dd | 847 | |
cbc5abf9 | 848 | debug3("sign_and_send_pubkey"); |
fee56204 | 849 | |
43348518 | 850 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 851 | /* we cannot handle this key */ |
cbc5abf9 | 852 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 853 | return 0; |
854 | } | |
a306f2dd | 855 | /* data to be signed */ |
856 | buffer_init(&b); | |
33de75a3 | 857 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 858 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 859 | skip = session_id2_len; |
33de75a3 | 860 | } else { |
861 | buffer_put_string(&b, session_id2, session_id2_len); | |
862 | skip = buffer_len(&b); | |
74fc9186 | 863 | } |
a306f2dd | 864 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 865 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 866 | buffer_put_cstring(&b, |
cbc5abf9 | 867 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 868 | "ssh-userauth" : |
188adeb2 | 869 | authctxt->service); |
cbc5abf9 | 870 | if (datafellows & SSH_BUG_PKAUTH) { |
871 | buffer_put_char(&b, have_sig); | |
872 | } else { | |
873 | buffer_put_cstring(&b, authctxt->method->name); | |
874 | buffer_put_char(&b, have_sig); | |
43348518 | 875 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 876 | } |
a306f2dd | 877 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 878 | |
879 | /* generate signature */ | |
43348518 | 880 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 881 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 882 | if (ret == -1) { |
883 | xfree(blob); | |
884 | buffer_free(&b); | |
885 | return 0; | |
886 | } | |
fa08c86b | 887 | #ifdef DEBUG_PK |
a306f2dd | 888 | buffer_dump(&b); |
889 | #endif | |
cbc5abf9 | 890 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 891 | buffer_clear(&b); |
892 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 893 | skip = session_id2_len; |
d0c832f3 | 894 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 895 | buffer_put_cstring(&b, authctxt->server_user); |
896 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 897 | buffer_put_cstring(&b, authctxt->method->name); |
898 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 899 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 900 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 901 | buffer_put_string(&b, blob, bloblen); |
902 | } | |
903 | xfree(blob); | |
fee56204 | 904 | |
a306f2dd | 905 | /* append signature */ |
906 | buffer_put_string(&b, signature, slen); | |
907 | xfree(signature); | |
908 | ||
909 | /* skip session id and packet type */ | |
74fc9186 | 910 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 911 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 912 | buffer_consume(&b, skip + 1); |
a306f2dd | 913 | |
914 | /* put remaining data from buffer into packet */ | |
915 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
916 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
917 | buffer_free(&b); | |
a306f2dd | 918 | packet_send(); |
2e73a022 | 919 | |
920 | return 1; | |
4c8722d9 | 921 | } |
922 | ||
396c147e | 923 | static int |
43348518 | 924 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 925 | { |
fee56204 | 926 | u_char *blob; |
21b30f38 | 927 | u_int bloblen, have_sig = 0; |
4c8722d9 | 928 | |
fee56204 | 929 | debug3("send_pubkey_test"); |
930 | ||
43348518 | 931 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 932 | /* we cannot handle this key */ |
933 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 934 | return 0; |
935 | } | |
fee56204 | 936 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 937 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 938 | |
fee56204 | 939 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
940 | packet_put_cstring(authctxt->server_user); | |
941 | packet_put_cstring(authctxt->service); | |
942 | packet_put_cstring(authctxt->method->name); | |
943 | packet_put_char(have_sig); | |
944 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 945 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 946 | packet_put_string(blob, bloblen); |
947 | xfree(blob); | |
948 | packet_send(); | |
949 | return 1; | |
950 | } | |
951 | ||
396c147e | 952 | static Key * |
fee56204 | 953 | load_identity_file(char *filename) |
954 | { | |
955 | Key *private; | |
956 | char prompt[300], *passphrase; | |
aeaa3d9e | 957 | int quit, i; |
d156519a | 958 | struct stat st; |
fee56204 | 959 | |
d156519a | 960 | if (stat(filename, &st) < 0) { |
961 | debug3("no such identity: %s", filename); | |
962 | return NULL; | |
963 | } | |
aeaa3d9e | 964 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
965 | if (private == NULL) { | |
966 | if (options.batch_mode) | |
fee56204 | 967 | return NULL; |
4c8722d9 | 968 | snprintf(prompt, sizeof prompt, |
184eed6a | 969 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 970 | for (i = 0; i < options.number_of_password_prompts; i++) { |
971 | passphrase = read_passphrase(prompt, 0); | |
972 | if (strcmp(passphrase, "") != 0) { | |
aeaa3d9e | 973 | private = key_load_private_type(KEY_UNSPEC, filename, |
974 | passphrase, NULL); | |
fee56204 | 975 | quit = 0; |
188adeb2 | 976 | } else { |
977 | debug2("no passphrase given, try next key"); | |
fee56204 | 978 | quit = 1; |
188adeb2 | 979 | } |
980 | memset(passphrase, 0, strlen(passphrase)); | |
981 | xfree(passphrase); | |
aeaa3d9e | 982 | if (private != NULL || quit) |
188adeb2 | 983 | break; |
984 | debug2("bad passphrase given, try again..."); | |
985 | } | |
4c8722d9 | 986 | } |
fee56204 | 987 | return private; |
988 | } | |
989 | ||
43348518 | 990 | /* |
991 | * try keys in the following order: | |
992 | * 1. agent keys that are found in the config file | |
993 | * 2. other agent keys | |
994 | * 3. keys that are only listed in the config file | |
995 | */ | |
996 | static void | |
997 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 998 | { |
43348518 | 999 | Identity *id; |
1000 | Idlist agent, files, *preferred; | |
1001 | Key *key; | |
1002 | AuthenticationConnection *ac; | |
1003 | char *comment; | |
1004 | int i, found; | |
1005 | ||
1006 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1007 | TAILQ_INIT(&files); /* keys from the config file */ | |
1008 | preferred = &authctxt->keys; | |
1009 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1010 | ||
1011 | /* list of keys stored in the filesystem */ | |
1012 | for (i = 0; i < options.num_identity_files; i++) { | |
1013 | key = options.identity_keys[i]; | |
1014 | if (key && key->type == KEY_RSA1) | |
1015 | continue; | |
1016 | options.identity_keys[i] = NULL; | |
1017 | id = xmalloc(sizeof(*id)); | |
1018 | memset(id, 0, sizeof(*id)); | |
1019 | id->key = key; | |
1020 | id->filename = xstrdup(options.identity_files[i]); | |
1021 | TAILQ_INSERT_TAIL(&files, id, next); | |
1022 | } | |
1023 | /* list of keys supported by the agent */ | |
1024 | if ((ac = ssh_get_authentication_connection())) { | |
1025 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1026 | key != NULL; | |
1027 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1028 | found = 0; | |
1029 | TAILQ_FOREACH(id, &files, next) { | |
1030 | /* agent keys from the config file are preferred */ | |
1031 | if (key_equal(key, id->key)) { | |
1032 | key_free(key); | |
1033 | xfree(comment); | |
1034 | TAILQ_REMOVE(&files, id, next); | |
1035 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1036 | id->ac = ac; | |
1037 | found = 1; | |
1038 | break; | |
1039 | } | |
1040 | } | |
1041 | if (!found) { | |
1042 | id = xmalloc(sizeof(*id)); | |
1043 | memset(id, 0, sizeof(*id)); | |
1044 | id->key = key; | |
1045 | id->filename = comment; | |
1046 | id->ac = ac; | |
1047 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1048 | } | |
1049 | } | |
1050 | /* append remaining agent keys */ | |
1051 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1052 | TAILQ_REMOVE(&agent, id, next); | |
1053 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1054 | } | |
1055 | authctxt->agent = ac; | |
1056 | } | |
1057 | /* append remaining keys from the config file */ | |
1058 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1059 | TAILQ_REMOVE(&files, id, next); | |
1060 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1061 | } | |
1062 | TAILQ_FOREACH(id, preferred, next) { | |
1063 | debug2("key: %s (%p)", id->filename, id->key); | |
1064 | } | |
fee56204 | 1065 | } |
1066 | ||
43348518 | 1067 | static void |
1068 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1069 | { |
43348518 | 1070 | Identity *id; |
1071 | ||
1072 | if (authctxt->agent != NULL) | |
1073 | ssh_close_authentication_connection(authctxt->agent); | |
1074 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1075 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1076 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1077 | if (id->key) | |
1078 | key_free(id->key); | |
1079 | if (id->filename) | |
1080 | xfree(id->filename); | |
1081 | xfree(id); | |
2e73a022 | 1082 | } |
a306f2dd | 1083 | } |
1084 | ||
188adeb2 | 1085 | int |
1086 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1087 | { |
43348518 | 1088 | Identity *id; |
188adeb2 | 1089 | int sent = 0; |
1090 | ||
43348518 | 1091 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1092 | if (id->tried++) | |
1093 | return (0); | |
1094 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1095 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1096 | /* | |
1097 | * send a test message if we have the public key. for | |
1098 | * encrypted keys we cannot do this and have to load the | |
1099 | * private key instead | |
1100 | */ | |
1101 | if (id->key && id->key->type != KEY_RSA1) { | |
1102 | debug("Offering public key: %s", id->filename); | |
1103 | sent = send_pubkey_test(authctxt, id); | |
1104 | } else if (id->key == NULL) { | |
1105 | debug("Trying private key: %s", id->filename); | |
1106 | id->key = load_identity_file(id->filename); | |
1107 | if (id->key != NULL) { | |
1108 | id->isprivate = 1; | |
1109 | sent = sign_and_send_pubkey(authctxt, id); | |
1110 | key_free(id->key); | |
1111 | id->key = NULL; | |
fee56204 | 1112 | } |
fee56204 | 1113 | } |
43348518 | 1114 | if (sent) |
1115 | return (sent); | |
fa08c86b | 1116 | } |
43348518 | 1117 | return (0); |
188adeb2 | 1118 | } |
a306f2dd | 1119 | |
94ec8c6b | 1120 | /* |
1121 | * Send userauth request message specifying keyboard-interactive method. | |
1122 | */ | |
1123 | int | |
1124 | userauth_kbdint(Authctxt *authctxt) | |
1125 | { | |
1126 | static int attempt = 0; | |
1127 | ||
1128 | if (attempt++ >= options.number_of_password_prompts) | |
1129 | return 0; | |
6b759005 | 1130 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1131 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1132 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1133 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1134 | return 0; | |
1135 | } | |
94ec8c6b | 1136 | |
1137 | debug2("userauth_kbdint"); | |
1138 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1139 | packet_put_cstring(authctxt->server_user); | |
1140 | packet_put_cstring(authctxt->service); | |
1141 | packet_put_cstring(authctxt->method->name); | |
1142 | packet_put_cstring(""); /* lang */ | |
1143 | packet_put_cstring(options.kbd_interactive_devices ? | |
1144 | options.kbd_interactive_devices : ""); | |
1145 | packet_send(); | |
94ec8c6b | 1146 | |
1147 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1148 | return 1; | |
1149 | } | |
1150 | ||
1151 | /* | |
f72e01a5 | 1152 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1153 | */ |
1154 | void | |
7819b5c3 | 1155 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1156 | { |
1157 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1158 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1159 | u_int num_prompts, i; |
94ec8c6b | 1160 | int echo = 0; |
1161 | ||
1162 | debug2("input_userauth_info_req"); | |
1163 | ||
1164 | if (authctxt == NULL) | |
1165 | fatal("input_userauth_info_req: no authentication context"); | |
1166 | ||
6b759005 | 1167 | authctxt->info_req_seen = 1; |
1168 | ||
94ec8c6b | 1169 | name = packet_get_string(NULL); |
1170 | inst = packet_get_string(NULL); | |
1171 | lang = packet_get_string(NULL); | |
94ec8c6b | 1172 | if (strlen(name) > 0) |
bbe88b6d | 1173 | logit("%s", name); |
94ec8c6b | 1174 | if (strlen(inst) > 0) |
bbe88b6d | 1175 | logit("%s", inst); |
f72e01a5 | 1176 | xfree(name); |
94ec8c6b | 1177 | xfree(inst); |
f72e01a5 | 1178 | xfree(lang); |
94ec8c6b | 1179 | |
1180 | num_prompts = packet_get_int(); | |
1181 | /* | |
1182 | * Begin to build info response packet based on prompts requested. | |
1183 | * We commit to providing the correct number of responses, so if | |
1184 | * further on we run into a problem that prevents this, we have to | |
1185 | * be sure and clean this up and send a correct error response. | |
1186 | */ | |
1187 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1188 | packet_put_int(num_prompts); | |
1189 | ||
5ba55ada | 1190 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1191 | for (i = 0; i < num_prompts; i++) { |
1192 | prompt = packet_get_string(NULL); | |
1193 | echo = packet_get_char(); | |
1194 | ||
1843a425 | 1195 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1196 | |
a6215e53 | 1197 | packet_put_cstring(response); |
94ec8c6b | 1198 | memset(response, 0, strlen(response)); |
1199 | xfree(response); | |
1200 | xfree(prompt); | |
1201 | } | |
95500969 | 1202 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1203 | |
b4b701be | 1204 | packet_add_padding(64); |
94ec8c6b | 1205 | packet_send(); |
94ec8c6b | 1206 | } |
a306f2dd | 1207 | |
39c00dc2 | 1208 | static int |
d6133f43 | 1209 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1210 | u_char *data, u_int datalen) |
1211 | { | |
1212 | Buffer b; | |
7091a26b | 1213 | struct stat st; |
39c00dc2 | 1214 | pid_t pid; |
d4826734 | 1215 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1216 | |
6226a8f8 | 1217 | debug2("ssh_keysign called"); |
39c00dc2 | 1218 | |
7091a26b | 1219 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1220 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1221 | return -1; | |
1222 | } | |
39c00dc2 | 1223 | if (fflush(stdout) != 0) |
1224 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1225 | if (pipe(to) < 0) { | |
1226 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1227 | return -1; | |
1228 | } | |
1229 | if (pipe(from) < 0) { | |
1230 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1231 | return -1; | |
1232 | } | |
1233 | if ((pid = fork()) < 0) { | |
1234 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1235 | return -1; | |
1236 | } | |
1237 | if (pid == 0) { | |
1238 | seteuid(getuid()); | |
1239 | setuid(getuid()); | |
1240 | close(from[0]); | |
1241 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1242 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1243 | close(to[1]); | |
1244 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1245 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1246 | close(from[1]); |
1247 | close(to[0]); | |
a3f69458 | 1248 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1249 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1250 | strerror(errno)); | |
1251 | } | |
1252 | close(from[1]); | |
1253 | close(to[0]); | |
1254 | ||
1255 | buffer_init(&b); | |
d4826734 | 1256 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1257 | buffer_put_string(&b, data, datalen); |
e987fdbe | 1258 | ssh_msg_send(to[1], version, &b); |
39c00dc2 | 1259 | |
e987fdbe | 1260 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1261 | error("ssh_keysign: no reply"); |
39c00dc2 | 1262 | buffer_clear(&b); |
1263 | return -1; | |
1264 | } | |
39c00dc2 | 1265 | close(from[0]); |
1266 | close(to[1]); | |
1267 | ||
d4826734 | 1268 | while (waitpid(pid, &status, 0) < 0) |
1269 | if (errno != EINTR) | |
1270 | break; | |
39c00dc2 | 1271 | |
7091a26b | 1272 | if (buffer_get_char(&b) != version) { |
1273 | error("ssh_keysign: bad version"); | |
1274 | buffer_clear(&b); | |
1275 | return -1; | |
1276 | } | |
1277 | *sigp = buffer_get_string(&b, lenp); | |
1278 | buffer_clear(&b); | |
1279 | ||
39c00dc2 | 1280 | return 0; |
1281 | } | |
1282 | ||
8002af61 | 1283 | int |
1284 | userauth_hostbased(Authctxt *authctxt) | |
1285 | { | |
1286 | Key *private = NULL; | |
39c00dc2 | 1287 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1288 | Buffer b; |
1289 | u_char *signature, *blob; | |
1290 | char *chost, *pkalg, *p; | |
8dddf799 | 1291 | const char *service; |
8002af61 | 1292 | u_int blen, slen; |
f98c3421 | 1293 | int ok, i, len, found = 0; |
8002af61 | 1294 | |
8002af61 | 1295 | /* check for a useful key */ |
39c00dc2 | 1296 | for (i = 0; i < sensitive->nkeys; i++) { |
1297 | private = sensitive->keys[i]; | |
8002af61 | 1298 | if (private && private->type != KEY_RSA1) { |
1299 | found = 1; | |
1300 | /* we take and free the key */ | |
39c00dc2 | 1301 | sensitive->keys[i] = NULL; |
8002af61 | 1302 | break; |
1303 | } | |
1304 | } | |
1305 | if (!found) { | |
6226a8f8 | 1306 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1307 | return 0; |
1308 | } | |
1309 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1310 | key_free(private); | |
8002af61 | 1311 | return 0; |
1312 | } | |
e8d59b4d | 1313 | /* figure out a name for the client host */ |
1314 | p = get_local_name(packet_get_connection_in()); | |
1315 | if (p == NULL) { | |
1316 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1317 | key_free(private); | |
1318 | return 0; | |
1319 | } | |
1320 | len = strlen(p) + 2; | |
1321 | chost = xmalloc(len); | |
1322 | strlcpy(chost, p, len); | |
1323 | strlcat(chost, ".", len); | |
1324 | debug2("userauth_hostbased: chost %s", chost); | |
3e2f2431 | 1325 | xfree(p); |
e8d59b4d | 1326 | |
8dddf799 | 1327 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1328 | authctxt->service; | |
8002af61 | 1329 | pkalg = xstrdup(key_ssh_name(private)); |
1330 | buffer_init(&b); | |
8002af61 | 1331 | /* construct data */ |
8dddf799 | 1332 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1333 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1334 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1335 | buffer_put_cstring(&b, service); |
8002af61 | 1336 | buffer_put_cstring(&b, authctxt->method->name); |
1337 | buffer_put_cstring(&b, pkalg); | |
1338 | buffer_put_string(&b, blob, blen); | |
1339 | buffer_put_cstring(&b, chost); | |
1340 | buffer_put_cstring(&b, authctxt->local_user); | |
1341 | #ifdef DEBUG_PK | |
1342 | buffer_dump(&b); | |
1343 | #endif | |
39c00dc2 | 1344 | if (sensitive->external_keysign) |
1345 | ok = ssh_keysign(private, &signature, &slen, | |
1346 | buffer_ptr(&b), buffer_len(&b)); | |
1347 | else | |
1348 | ok = key_sign(private, &signature, &slen, | |
1349 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1350 | key_free(private); |
1351 | buffer_free(&b); | |
1352 | if (ok != 0) { | |
1353 | error("key_sign failed"); | |
1354 | xfree(chost); | |
1355 | xfree(pkalg); | |
1356 | return 0; | |
1357 | } | |
1358 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1359 | packet_put_cstring(authctxt->server_user); | |
1360 | packet_put_cstring(authctxt->service); | |
1361 | packet_put_cstring(authctxt->method->name); | |
1362 | packet_put_cstring(pkalg); | |
1363 | packet_put_string(blob, blen); | |
1364 | packet_put_cstring(chost); | |
1365 | packet_put_cstring(authctxt->local_user); | |
1366 | packet_put_string(signature, slen); | |
1367 | memset(signature, 's', slen); | |
1368 | xfree(signature); | |
1369 | xfree(chost); | |
1370 | xfree(pkalg); | |
1371 | ||
1372 | packet_send(); | |
1373 | return 1; | |
1374 | } | |
1375 | ||
802e01b8 | 1376 | #if KRB5 |
1377 | static int | |
83ccf11a | 1378 | ssh_krb5_helper(krb5_data *ap, krb5_context *context) |
802e01b8 | 1379 | { |
1380 | krb5_context xcontext = NULL; /* XXX share with ssh1 */ | |
1381 | krb5_auth_context xauth_context = NULL; | |
802e01b8 | 1382 | krb5_auth_context *auth_context; |
1383 | krb5_error_code problem; | |
1384 | const char *tkfile; | |
1385 | struct stat buf; | |
1386 | krb5_ccache ccache = NULL; | |
1387 | const char *remotehost; | |
1388 | int ret; | |
1389 | ||
1390 | memset(ap, 0, sizeof(*ap)); | |
1391 | ||
1392 | context = &xcontext; | |
1393 | auth_context = &xauth_context; | |
1394 | ||
1395 | problem = krb5_init_context(context); | |
1396 | if (problem) { | |
1397 | debug("Kerberos v5: krb5_init_context failed"); | |
1398 | ret = 0; | |
1399 | goto out; | |
1400 | } | |
1401 | ||
1402 | tkfile = krb5_cc_default_name(*context); | |
1403 | if (strncmp(tkfile, "FILE:", 5) == 0) | |
1404 | tkfile += 5; | |
1405 | ||
1406 | if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) { | |
1407 | debug("Kerberos v5: could not get default ccache (permission denied)."); | |
1408 | ret = 0; | |
1409 | goto out; | |
1410 | } | |
1411 | ||
1412 | problem = krb5_cc_default(*context, &ccache); | |
1413 | if (problem) { | |
1414 | debug("Kerberos v5: krb5_cc_default failed: %s", | |
1415 | krb5_get_err_text(*context, problem)); | |
1416 | ret = 0; | |
1417 | goto out; | |
1418 | } | |
1419 | ||
1420 | remotehost = get_canonical_hostname(1); | |
1421 | ||
1422 | problem = krb5_mk_req(*context, auth_context, AP_OPTS_MUTUAL_REQUIRED, | |
1423 | "host", remotehost, NULL, ccache, ap); | |
1424 | if (problem) { | |
1425 | debug("Kerberos v5: krb5_mk_req failed: %s", | |
1426 | krb5_get_err_text(*context, problem)); | |
1427 | ret = 0; | |
1428 | goto out; | |
1429 | } | |
1430 | ret = 1; | |
1431 | ||
1432 | out: | |
1433 | if (ccache != NULL) | |
1434 | krb5_cc_close(*context, ccache); | |
1435 | if (*auth_context) | |
1436 | krb5_auth_con_free(*context, *auth_context); | |
802e01b8 | 1437 | return (ret); |
1438 | } | |
1439 | ||
1440 | int | |
1441 | userauth_kerberos(Authctxt *authctxt) | |
1442 | { | |
1443 | krb5_data ap; | |
83ccf11a | 1444 | krb5_context *context; |
1445 | int ret = 0; | |
802e01b8 | 1446 | |
83ccf11a | 1447 | if (ssh_krb5_helper(&ap, context) == 0) |
1448 | goto out; | |
802e01b8 | 1449 | |
1450 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1451 | packet_put_cstring(authctxt->server_user); | |
1452 | packet_put_cstring(authctxt->service); | |
1453 | packet_put_cstring(authctxt->method->name); | |
1454 | packet_put_string(ap.data, ap.length); | |
1455 | packet_send(); | |
1456 | ||
751092f9 | 1457 | #ifdef HEIMDAL |
802e01b8 | 1458 | krb5_data_free(&ap); |
751092f9 | 1459 | #else |
83ccf11a | 1460 | krb5_free_data_contents(*context, &ap); |
751092f9 | 1461 | #endif |
83ccf11a | 1462 | ret = 1; |
751092f9 | 1463 | |
83ccf11a | 1464 | out: |
1465 | if (*context) | |
1466 | krb5_free_context(*context); | |
1467 | return ret; | |
802e01b8 | 1468 | } |
1469 | #endif | |
1470 | ||
188adeb2 | 1471 | /* find auth method */ |
1472 | ||
188adeb2 | 1473 | /* |
1474 | * given auth method name, if configurable options permit this method fill | |
1475 | * in auth_ident field and return true, otherwise return false. | |
1476 | */ | |
396c147e | 1477 | static int |
188adeb2 | 1478 | authmethod_is_enabled(Authmethod *method) |
1479 | { | |
1480 | if (method == NULL) | |
1481 | return 0; | |
1482 | /* return false if options indicate this method is disabled */ | |
1483 | if (method->enabled == NULL || *method->enabled == 0) | |
1484 | return 0; | |
1485 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1486 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1487 | return 0; | |
1488 | return 1; | |
1489 | } | |
a306f2dd | 1490 | |
396c147e | 1491 | static Authmethod * |
188adeb2 | 1492 | authmethod_lookup(const char *name) |
1493 | { | |
1494 | Authmethod *method = NULL; | |
1495 | if (name != NULL) | |
1496 | for (method = authmethods; method->name != NULL; method++) | |
1497 | if (strcmp(name, method->name) == 0) | |
1498 | return method; | |
1499 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1500 | return NULL; | |
1501 | } | |
1502 | ||
cab80f75 | 1503 | /* XXX internal state */ |
1504 | static Authmethod *current = NULL; | |
1505 | static char *supported = NULL; | |
1506 | static char *preferred = NULL; | |
d6133f43 | 1507 | |
188adeb2 | 1508 | /* |
1509 | * Given the authentication method list sent by the server, return the | |
1510 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1511 | * use a built-in default list. |
2b87da3b | 1512 | */ |
396c147e | 1513 | static Authmethod * |
188adeb2 | 1514 | authmethod_get(char *authlist) |
1515 | { | |
cab80f75 | 1516 | char *name = NULL; |
21b30f38 | 1517 | u_int next; |
2b87da3b | 1518 | |
188adeb2 | 1519 | /* Use a suitable default if we're passed a nil list. */ |
1520 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1521 | authlist = options.preferred_authentications; |
1522 | ||
1523 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1524 | debug3("start over, passed a different list %s", authlist); | |
1525 | if (supported != NULL) | |
1526 | xfree(supported); | |
1527 | supported = xstrdup(authlist); | |
1528 | preferred = options.preferred_authentications; | |
1529 | debug3("preferred %s", preferred); | |
1530 | current = NULL; | |
1531 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1532 | return current; | |
188adeb2 | 1533 | |
cab80f75 | 1534 | for (;;) { |
1535 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1536 | debug("No more authentication methods to try."); |
cab80f75 | 1537 | current = NULL; |
1538 | return NULL; | |
1539 | } | |
1540 | preferred += next; | |
94ec8c6b | 1541 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1542 | debug3("remaining preferred: %s", preferred); |
1543 | if ((current = authmethod_lookup(name)) != NULL && | |
1544 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1545 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1546 | debug("Next authentication method: %s", name); |
cab80f75 | 1547 | return current; |
94ec8c6b | 1548 | } |
a306f2dd | 1549 | } |
cab80f75 | 1550 | } |
a22aff1f | 1551 | |
ffb215be | 1552 | static char * |
cab80f75 | 1553 | authmethods_get(void) |
1554 | { | |
1555 | Authmethod *method = NULL; | |
3469eac4 | 1556 | Buffer b; |
1557 | char *list; | |
cab80f75 | 1558 | |
3469eac4 | 1559 | buffer_init(&b); |
cab80f75 | 1560 | for (method = authmethods; method->name != NULL; method++) { |
1561 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1562 | if (buffer_len(&b) > 0) |
1563 | buffer_append(&b, ",", 1); | |
1564 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1565 | } |
1566 | } | |
3469eac4 | 1567 | buffer_append(&b, "\0", 1); |
1568 | list = xstrdup(buffer_ptr(&b)); | |
1569 | buffer_free(&b); | |
1570 | return list; | |
a306f2dd | 1571 | } |