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