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9108f8d9 | 1 | /* $OpenBSD: sshconnect2.c,v 1.162 2006/08/30 00:06:51 dtucker Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
9108f8d9 | 27 | |
28 | #include <sys/types.h> | |
29 | #include <sys/socket.h> | |
30 | #include <sys/wait.h> | |
31 | #include <sys/stat.h> | |
32 | ||
33 | #include <errno.h> | |
34 | #include <pwd.h> | |
35 | #include <signal.h> | |
36 | #include <stdarg.h> | |
37 | #include <stdio.h> | |
38 | #include <string.h> | |
39 | #include <unistd.h> | |
0fff78ff | 40 | |
41 | #include "openbsd-compat/sys-queue.h" | |
3c0ef626 | 42 | |
9108f8d9 | 43 | #include "xmalloc.h" |
3c0ef626 | 44 | #include "ssh.h" |
45 | #include "ssh2.h" | |
3c0ef626 | 46 | #include "buffer.h" |
47 | #include "packet.h" | |
3c0ef626 | 48 | #include "compat.h" |
3c0ef626 | 49 | #include "cipher.h" |
9108f8d9 | 50 | #include "key.h" |
3c0ef626 | 51 | #include "kex.h" |
52 | #include "myproposal.h" | |
3c0ef626 | 53 | #include "sshconnect.h" |
54 | #include "authfile.h" | |
55 | #include "dh.h" | |
56 | #include "authfd.h" | |
57 | #include "log.h" | |
58 | #include "readconf.h" | |
c9f39d2c | 59 | #include "misc.h" |
3c0ef626 | 60 | #include "match.h" |
61 | #include "dispatch.h" | |
62 | #include "canohost.h" | |
f5799ae1 | 63 | #include "msg.h" |
64 | #include "pathnames.h" | |
9108f8d9 | 65 | #include "uidswap.h" |
3c0ef626 | 66 | |
0fff78ff | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | #endif | |
70 | ||
3c0ef626 | 71 | /* import */ |
72 | extern char *client_version_string; | |
73 | extern char *server_version_string; | |
74 | extern Options options; | |
75 | ||
76 | /* | |
77 | * SSH2 key exchange | |
78 | */ | |
79 | ||
80 | u_char *session_id2 = NULL; | |
0fff78ff | 81 | u_int session_id2_len = 0; |
3c0ef626 | 82 | |
83 | char *xxx_host; | |
84 | struct sockaddr *xxx_hostaddr; | |
85 | ||
86 | Kex *xxx_kex = NULL; | |
87 | ||
88 | static int | |
89 | verify_host_key_callback(Key *hostkey) | |
90 | { | |
91 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) | |
92 | fatal("Host key verification failed."); | |
93 | return 0; | |
94 | } | |
95 | ||
96 | void | |
97 | ssh_kex2(char *host, struct sockaddr *hostaddr) | |
98 | { | |
99 | Kex *kex; | |
100 | ||
d617aef3 | 101 | #ifdef GSSAPI |
102 | char *orig = NULL, *gss = NULL; | |
103 | char *gss_host = NULL; | |
104 | #endif | |
105 | ||
3c0ef626 | 106 | xxx_host = host; |
107 | xxx_hostaddr = hostaddr; | |
108 | ||
d617aef3 | 109 | #ifdef GSSAPI |
110 | if (options.gss_keyex) { | |
111 | /* Add the GSSAPI mechanisms currently supported on this | |
112 | * client to the key exchange algorithm proposal */ | |
113 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
114 | ||
115 | if (options.gss_trust_dns) | |
116 | gss_host = (char *)get_canonical_hostname(1); | |
117 | else | |
118 | gss_host = host; | |
119 | ||
120 | gss = ssh_gssapi_client_mechanisms(gss_host); | |
121 | if (gss) { | |
122 | debug("Offering GSSAPI proposal: %s", gss); | |
123 | xasprintf(&myproposal[PROPOSAL_KEX_ALGS], | |
124 | "%s,%s", gss, orig); | |
125 | } | |
126 | } | |
127 | #endif | |
128 | ||
3c0ef626 | 129 | if (options.ciphers == (char *)-1) { |
0fff78ff | 130 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
3c0ef626 | 131 | options.ciphers = NULL; |
132 | } | |
133 | if (options.ciphers != NULL) { | |
134 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
135 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
136 | } | |
137 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
138 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
139 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
140 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
141 | if (options.compression) { | |
142 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
665a873d | 143 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
3c0ef626 | 144 | } else { |
145 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
665a873d | 146 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
3c0ef626 | 147 | } |
148 | if (options.macs != NULL) { | |
149 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
150 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
151 | } | |
152 | if (options.hostkeyalgorithms != NULL) | |
e9a17296 | 153 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
3c0ef626 | 154 | options.hostkeyalgorithms; |
155 | ||
d617aef3 | 156 | #ifdef GSSAPI |
157 | /* If we've got GSSAPI algorithms, then we also support the | |
158 | * 'null' hostkey, as a last resort */ | |
159 | if (options.gss_keyex && gss) { | |
160 | orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]; | |
161 | xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS], | |
162 | "%s,null", orig); | |
163 | } | |
164 | #endif | |
165 | ||
0fff78ff | 166 | if (options.rekey_limit) |
167 | packet_set_rekey_limit(options.rekey_limit); | |
168 | ||
3c0ef626 | 169 | /* start key exchange */ |
170 | kex = kex_setup(myproposal); | |
6a9b3198 | 171 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
c9f39d2c | 172 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
6a9b3198 | 173 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
9108f8d9 | 174 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
d617aef3 | 175 | #ifdef GSSAPI |
176 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client; | |
177 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_client; | |
178 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_client; | |
179 | #endif | |
3c0ef626 | 180 | kex->client_version_string=client_version_string; |
181 | kex->server_version_string=server_version_string; | |
182 | kex->verify_host_key=&verify_host_key_callback; | |
183 | ||
d617aef3 | 184 | #ifdef GSSAPI |
185 | kex->gss_deleg_creds = options.gss_deleg_creds; | |
186 | kex->gss_trust_dns = options.gss_trust_dns; | |
187 | kex->gss_host = gss_host; | |
188 | #endif | |
189 | ||
3c0ef626 | 190 | xxx_kex = kex; |
191 | ||
192 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
193 | ||
194 | session_id2 = kex->session_id; | |
195 | session_id2_len = kex->session_id_len; | |
196 | ||
197 | #ifdef DEBUG_KEXDH | |
198 | /* send 1st encrypted/maced/compressed message */ | |
199 | packet_start(SSH2_MSG_IGNORE); | |
200 | packet_put_cstring("markus"); | |
201 | packet_send(); | |
202 | packet_write_wait(); | |
203 | #endif | |
3c0ef626 | 204 | } |
205 | ||
206 | /* | |
207 | * Authenticate user | |
208 | */ | |
209 | ||
210 | typedef struct Authctxt Authctxt; | |
211 | typedef struct Authmethod Authmethod; | |
0fff78ff | 212 | typedef struct identity Identity; |
213 | typedef struct idlist Idlist; | |
214 | ||
215 | struct identity { | |
216 | TAILQ_ENTRY(identity) next; | |
217 | AuthenticationConnection *ac; /* set if agent supports key */ | |
218 | Key *key; /* public/private key */ | |
219 | char *filename; /* comment for agent-only keys */ | |
220 | int tried; | |
221 | int isprivate; /* key points to the private key */ | |
222 | }; | |
223 | TAILQ_HEAD(idlist, identity); | |
3c0ef626 | 224 | |
225 | struct Authctxt { | |
226 | const char *server_user; | |
227 | const char *local_user; | |
228 | const char *host; | |
229 | const char *service; | |
230 | Authmethod *method; | |
231 | int success; | |
232 | char *authlist; | |
233 | /* pubkey */ | |
0fff78ff | 234 | Idlist keys; |
3c0ef626 | 235 | AuthenticationConnection *agent; |
236 | /* hostbased */ | |
f5799ae1 | 237 | Sensitive *sensitive; |
3c0ef626 | 238 | /* kbd-interactive */ |
239 | int info_req_seen; | |
0fff78ff | 240 | /* generic */ |
241 | void *methoddata; | |
3c0ef626 | 242 | }; |
243 | struct Authmethod { | |
244 | char *name; /* string to compare against server's list */ | |
245 | int (*userauth)(Authctxt *authctxt); | |
246 | int *enabled; /* flag in option struct that enables method */ | |
247 | int *batch_flag; /* flag in option struct that disables method */ | |
248 | }; | |
249 | ||
e9a17296 | 250 | void input_userauth_success(int, u_int32_t, void *); |
251 | void input_userauth_failure(int, u_int32_t, void *); | |
252 | void input_userauth_banner(int, u_int32_t, void *); | |
253 | void input_userauth_error(int, u_int32_t, void *); | |
254 | void input_userauth_info_req(int, u_int32_t, void *); | |
255 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
700318f3 | 256 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
3c0ef626 | 257 | |
e9a17296 | 258 | int userauth_none(Authctxt *); |
259 | int userauth_pubkey(Authctxt *); | |
260 | int userauth_passwd(Authctxt *); | |
261 | int userauth_kbdint(Authctxt *); | |
262 | int userauth_hostbased(Authctxt *); | |
0fff78ff | 263 | int userauth_kerberos(Authctxt *); |
264 | ||
265 | #ifdef GSSAPI | |
266 | int userauth_gssapi(Authctxt *authctxt); | |
267 | void input_gssapi_response(int type, u_int32_t, void *); | |
268 | void input_gssapi_token(int type, u_int32_t, void *); | |
269 | void input_gssapi_hash(int type, u_int32_t, void *); | |
270 | void input_gssapi_error(int, u_int32_t, void *); | |
271 | void input_gssapi_errtok(int, u_int32_t, void *); | |
d617aef3 | 272 | int userauth_gsskeyex(Authctxt *authctxt); |
0fff78ff | 273 | #endif |
3c0ef626 | 274 | |
e9a17296 | 275 | void userauth(Authctxt *, char *); |
3c0ef626 | 276 | |
0fff78ff | 277 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
278 | static void pubkey_prepare(Authctxt *); | |
279 | static void pubkey_cleanup(Authctxt *); | |
280 | static Key *load_identity_file(char *); | |
3c0ef626 | 281 | |
282 | static Authmethod *authmethod_get(char *authlist); | |
283 | static Authmethod *authmethod_lookup(const char *name); | |
284 | static char *authmethods_get(void); | |
285 | ||
286 | Authmethod authmethods[] = { | |
0fff78ff | 287 | #ifdef GSSAPI |
d617aef3 | 288 | {"gssapi-keyex", |
289 | userauth_gsskeyex, | |
290 | &options.gss_authentication, | |
291 | NULL}, | |
cdd66111 | 292 | {"gssapi-with-mic", |
0fff78ff | 293 | userauth_gssapi, |
294 | &options.gss_authentication, | |
295 | NULL}, | |
296 | #endif | |
3c0ef626 | 297 | {"hostbased", |
298 | userauth_hostbased, | |
299 | &options.hostbased_authentication, | |
300 | NULL}, | |
301 | {"publickey", | |
302 | userauth_pubkey, | |
303 | &options.pubkey_authentication, | |
304 | NULL}, | |
305 | {"keyboard-interactive", | |
306 | userauth_kbdint, | |
307 | &options.kbd_interactive_authentication, | |
308 | &options.batch_mode}, | |
309 | {"password", | |
310 | userauth_passwd, | |
311 | &options.password_authentication, | |
312 | &options.batch_mode}, | |
313 | {"none", | |
314 | userauth_none, | |
315 | NULL, | |
316 | NULL}, | |
317 | {NULL, NULL, NULL, NULL} | |
318 | }; | |
319 | ||
320 | void | |
321 | ssh_userauth2(const char *local_user, const char *server_user, char *host, | |
f5799ae1 | 322 | Sensitive *sensitive) |
3c0ef626 | 323 | { |
324 | Authctxt authctxt; | |
325 | int type; | |
3c0ef626 | 326 | |
327 | if (options.challenge_response_authentication) | |
328 | options.kbd_interactive_authentication = 1; | |
329 | ||
3c0ef626 | 330 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
331 | packet_put_cstring("ssh-userauth"); | |
332 | packet_send(); | |
6a9b3198 | 333 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
3c0ef626 | 334 | packet_write_wait(); |
e9a17296 | 335 | type = packet_read(); |
6a9b3198 | 336 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
337 | fatal("Server denied authentication request: %d", type); | |
3c0ef626 | 338 | if (packet_remaining() > 0) { |
e9a17296 | 339 | char *reply = packet_get_string(NULL); |
6a9b3198 | 340 | debug2("service_accept: %s", reply); |
3c0ef626 | 341 | xfree(reply); |
342 | } else { | |
6a9b3198 | 343 | debug2("buggy server: service_accept w/o service"); |
3c0ef626 | 344 | } |
e9a17296 | 345 | packet_check_eom(); |
6a9b3198 | 346 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
3c0ef626 | 347 | |
348 | if (options.preferred_authentications == NULL) | |
349 | options.preferred_authentications = authmethods_get(); | |
350 | ||
351 | /* setup authentication context */ | |
352 | memset(&authctxt, 0, sizeof(authctxt)); | |
0fff78ff | 353 | pubkey_prepare(&authctxt); |
3c0ef626 | 354 | authctxt.server_user = server_user; |
355 | authctxt.local_user = local_user; | |
356 | authctxt.host = host; | |
357 | authctxt.service = "ssh-connection"; /* service name */ | |
358 | authctxt.success = 0; | |
359 | authctxt.method = authmethod_lookup("none"); | |
360 | authctxt.authlist = NULL; | |
0fff78ff | 361 | authctxt.methoddata = NULL; |
f5799ae1 | 362 | authctxt.sensitive = sensitive; |
3c0ef626 | 363 | authctxt.info_req_seen = 0; |
364 | if (authctxt.method == NULL) | |
365 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
366 | ||
367 | /* initial userauth request */ | |
368 | userauth_none(&authctxt); | |
369 | ||
370 | dispatch_init(&input_userauth_error); | |
371 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
372 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
373 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); | |
374 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
375 | ||
0fff78ff | 376 | pubkey_cleanup(&authctxt); |
377 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); | |
3c0ef626 | 378 | |
6a9b3198 | 379 | debug("Authentication succeeded (%s).", authctxt.method->name); |
3c0ef626 | 380 | } |
0fff78ff | 381 | |
3c0ef626 | 382 | void |
383 | userauth(Authctxt *authctxt, char *authlist) | |
384 | { | |
0fff78ff | 385 | if (authctxt->methoddata) { |
386 | xfree(authctxt->methoddata); | |
387 | authctxt->methoddata = NULL; | |
388 | } | |
3c0ef626 | 389 | if (authlist == NULL) { |
390 | authlist = authctxt->authlist; | |
391 | } else { | |
392 | if (authctxt->authlist) | |
393 | xfree(authctxt->authlist); | |
394 | authctxt->authlist = authlist; | |
395 | } | |
396 | for (;;) { | |
397 | Authmethod *method = authmethod_get(authlist); | |
398 | if (method == NULL) | |
399 | fatal("Permission denied (%s).", authlist); | |
400 | authctxt->method = method; | |
0fff78ff | 401 | |
402 | /* reset the per method handler */ | |
403 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
404 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
405 | ||
406 | /* and try new method */ | |
3c0ef626 | 407 | if (method->userauth(authctxt) != 0) { |
408 | debug2("we sent a %s packet, wait for reply", method->name); | |
409 | break; | |
410 | } else { | |
411 | debug2("we did not send a packet, disable method"); | |
412 | method->enabled = NULL; | |
413 | } | |
414 | } | |
415 | } | |
680cee3b | 416 | |
3c0ef626 | 417 | void |
e9a17296 | 418 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 419 | { |
420 | fatal("input_userauth_error: bad message during authentication: " | |
665a873d | 421 | "type %d", type); |
3c0ef626 | 422 | } |
680cee3b | 423 | |
3c0ef626 | 424 | void |
e9a17296 | 425 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 426 | { |
427 | char *msg, *lang; | |
cdd66111 | 428 | |
3c0ef626 | 429 | debug3("input_userauth_banner"); |
430 | msg = packet_get_string(NULL); | |
431 | lang = packet_get_string(NULL); | |
9108f8d9 | 432 | if (options.log_level >= SYSLOG_LEVEL_INFO) |
cdd66111 | 433 | fprintf(stderr, "%s", msg); |
3c0ef626 | 434 | xfree(msg); |
435 | xfree(lang); | |
436 | } | |
680cee3b | 437 | |
3c0ef626 | 438 | void |
e9a17296 | 439 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 440 | { |
441 | Authctxt *authctxt = ctxt; | |
442 | if (authctxt == NULL) | |
443 | fatal("input_userauth_success: no authentication context"); | |
cdd66111 | 444 | if (authctxt->authlist) { |
3c0ef626 | 445 | xfree(authctxt->authlist); |
cdd66111 | 446 | authctxt->authlist = NULL; |
447 | } | |
448 | if (authctxt->methoddata) { | |
0fff78ff | 449 | xfree(authctxt->methoddata); |
cdd66111 | 450 | authctxt->methoddata = NULL; |
451 | } | |
3c0ef626 | 452 | authctxt->success = 1; /* break out */ |
453 | } | |
680cee3b | 454 | |
3c0ef626 | 455 | void |
e9a17296 | 456 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 457 | { |
458 | Authctxt *authctxt = ctxt; | |
459 | char *authlist = NULL; | |
460 | int partial; | |
461 | ||
462 | if (authctxt == NULL) | |
463 | fatal("input_userauth_failure: no authentication context"); | |
464 | ||
465 | authlist = packet_get_string(NULL); | |
466 | partial = packet_get_char(); | |
e9a17296 | 467 | packet_check_eom(); |
3c0ef626 | 468 | |
469 | if (partial != 0) | |
0fff78ff | 470 | logit("Authenticated with partial success."); |
6a9b3198 | 471 | debug("Authentications that can continue: %s", authlist); |
3c0ef626 | 472 | |
3c0ef626 | 473 | userauth(authctxt, authlist); |
474 | } | |
475 | void | |
e9a17296 | 476 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 477 | { |
478 | Authctxt *authctxt = ctxt; | |
479 | Key *key = NULL; | |
0fff78ff | 480 | Identity *id = NULL; |
3c0ef626 | 481 | Buffer b; |
e9a17296 | 482 | int pktype, sent = 0; |
483 | u_int alen, blen; | |
484 | char *pkalg, *fp; | |
485 | u_char *pkblob; | |
3c0ef626 | 486 | |
487 | if (authctxt == NULL) | |
488 | fatal("input_userauth_pk_ok: no authentication context"); | |
489 | if (datafellows & SSH_BUG_PKOK) { | |
490 | /* this is similar to SSH_BUG_PKAUTH */ | |
491 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
492 | pkblob = packet_get_string(&blen); | |
493 | buffer_init(&b); | |
494 | buffer_append(&b, pkblob, blen); | |
495 | pkalg = buffer_get_string(&b, &alen); | |
496 | buffer_free(&b); | |
497 | } else { | |
498 | pkalg = packet_get_string(&alen); | |
499 | pkblob = packet_get_string(&blen); | |
500 | } | |
e9a17296 | 501 | packet_check_eom(); |
3c0ef626 | 502 | |
0fff78ff | 503 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
3c0ef626 | 504 | |
0fff78ff | 505 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
506 | debug("unknown pkalg %s", pkalg); | |
507 | goto done; | |
508 | } | |
509 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
510 | debug("no key from blob. pkalg %s", pkalg); | |
511 | goto done; | |
512 | } | |
513 | if (key->type != pktype) { | |
514 | error("input_userauth_pk_ok: type mismatch " | |
515 | "for decoded key (received %d, expected %d)", | |
516 | key->type, pktype); | |
517 | goto done; | |
518 | } | |
519 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
520 | debug2("input_userauth_pk_ok: fp %s", fp); | |
521 | xfree(fp); | |
522 | ||
cdd66111 | 523 | /* |
524 | * search keys in the reverse order, because last candidate has been | |
525 | * moved to the end of the queue. this also avoids confusion by | |
526 | * duplicate keys | |
527 | */ | |
c9f39d2c | 528 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
0fff78ff | 529 | if (key_equal(key, id->key)) { |
530 | sent = sign_and_send_pubkey(authctxt, id); | |
3c0ef626 | 531 | break; |
532 | } | |
0fff78ff | 533 | } |
534 | done: | |
3c0ef626 | 535 | if (key != NULL) |
536 | key_free(key); | |
537 | xfree(pkalg); | |
538 | xfree(pkblob); | |
539 | ||
41b2f314 | 540 | /* try another method if we did not send a packet */ |
3c0ef626 | 541 | if (sent == 0) |
542 | userauth(authctxt, NULL); | |
0fff78ff | 543 | } |
544 | ||
545 | #ifdef GSSAPI | |
cdd66111 | 546 | int |
0fff78ff | 547 | userauth_gssapi(Authctxt *authctxt) |
548 | { | |
549 | Gssctxt *gssctxt = NULL; | |
cdd66111 | 550 | static gss_OID_set gss_supported = NULL; |
665a873d | 551 | static u_int mech = 0; |
0fff78ff | 552 | OM_uint32 min; |
553 | int ok = 0; | |
d617aef3 | 554 | char *gss_host = NULL; |
555 | ||
556 | if (options.gss_trust_dns) | |
557 | gss_host = (char *)get_canonical_hostname(1); | |
558 | else | |
559 | gss_host = (char *)authctxt->host; | |
0fff78ff | 560 | |
561 | /* Try one GSSAPI method at a time, rather than sending them all at | |
562 | * once. */ | |
563 | ||
cdd66111 | 564 | if (gss_supported == NULL) |
565 | gss_indicate_mechs(&min, &gss_supported); | |
0fff78ff | 566 | |
567 | /* Check to see if the mechanism is usable before we offer it */ | |
cdd66111 | 568 | while (mech < gss_supported->count && !ok) { |
0fff78ff | 569 | /* My DER encoding requires length<128 */ |
cdd66111 | 570 | if (gss_supported->elements[mech].length < 128 && |
9108f8d9 | 571 | ssh_gssapi_check_mechanism(&gssctxt, |
d617aef3 | 572 | &gss_supported->elements[mech], gss_host)) { |
0fff78ff | 573 | ok = 1; /* Mechanism works */ |
574 | } else { | |
575 | mech++; | |
576 | } | |
577 | } | |
578 | ||
665a873d | 579 | if (!ok) |
580 | return 0; | |
0fff78ff | 581 | |
582 | authctxt->methoddata=(void *)gssctxt; | |
583 | ||
584 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
585 | packet_put_cstring(authctxt->server_user); | |
586 | packet_put_cstring(authctxt->service); | |
587 | packet_put_cstring(authctxt->method->name); | |
588 | ||
589 | packet_put_int(1); | |
590 | ||
cdd66111 | 591 | packet_put_int((gss_supported->elements[mech].length) + 2); |
592 | packet_put_char(SSH_GSS_OIDTYPE); | |
593 | packet_put_char(gss_supported->elements[mech].length); | |
594 | packet_put_raw(gss_supported->elements[mech].elements, | |
595 | gss_supported->elements[mech].length); | |
0fff78ff | 596 | |
597 | packet_send(); | |
598 | ||
599 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
600 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
601 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
602 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
603 | ||
604 | mech++; /* Move along to next candidate */ | |
605 | ||
606 | return 1; | |
607 | } | |
608 | ||
cdd66111 | 609 | static OM_uint32 |
610 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
611 | { | |
612 | Authctxt *authctxt = ctxt; | |
613 | Gssctxt *gssctxt = authctxt->methoddata; | |
614 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
665a873d | 615 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
616 | gss_buffer_desc gssbuf; | |
cdd66111 | 617 | OM_uint32 status, ms, flags; |
618 | Buffer b; | |
619 | ||
620 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
621 | recv_tok, &send_tok, &flags); | |
622 | ||
623 | if (send_tok.length > 0) { | |
624 | if (GSS_ERROR(status)) | |
625 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
626 | else | |
627 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
628 | ||
629 | packet_put_string(send_tok.value, send_tok.length); | |
630 | packet_send(); | |
631 | gss_release_buffer(&ms, &send_tok); | |
632 | } | |
633 | ||
634 | if (status == GSS_S_COMPLETE) { | |
635 | /* send either complete or MIC, depending on mechanism */ | |
636 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
637 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
638 | packet_send(); | |
639 | } else { | |
640 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
641 | authctxt->service, "gssapi-with-mic"); | |
642 | ||
643 | gssbuf.value = buffer_ptr(&b); | |
644 | gssbuf.length = buffer_len(&b); | |
645 | ||
646 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); | |
647 | ||
648 | if (!GSS_ERROR(status)) { | |
649 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
650 | packet_put_string(mic.value, mic.length); | |
651 | ||
652 | packet_send(); | |
653 | } | |
654 | ||
655 | buffer_free(&b); | |
656 | gss_release_buffer(&ms, &mic); | |
657 | } | |
658 | } | |
659 | ||
660 | return status; | |
661 | } | |
662 | ||
0fff78ff | 663 | void |
664 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
665 | { | |
666 | Authctxt *authctxt = ctxt; | |
667 | Gssctxt *gssctxt; | |
d617aef3 | 668 | u_int oidlen; |
669 | u_char *oidv; | |
0fff78ff | 670 | |
671 | if (authctxt == NULL) | |
672 | fatal("input_gssapi_response: no authentication context"); | |
673 | gssctxt = authctxt->methoddata; | |
674 | ||
675 | /* Setup our OID */ | |
676 | oidv = packet_get_string(&oidlen); | |
677 | ||
cdd66111 | 678 | if (oidlen <= 2 || |
679 | oidv[0] != SSH_GSS_OIDTYPE || | |
680 | oidv[1] != oidlen - 2) { | |
681 | xfree(oidv); | |
682 | debug("Badly encoded mechanism OID received"); | |
683 | userauth(authctxt, NULL); | |
684 | return; | |
0fff78ff | 685 | } |
686 | ||
cdd66111 | 687 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
688 | fatal("Server returned different OID than expected"); | |
689 | ||
0fff78ff | 690 | packet_check_eom(); |
691 | ||
692 | xfree(oidv); | |
693 | ||
cdd66111 | 694 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
0fff78ff | 695 | /* Start again with next method on list */ |
696 | debug("Trying to start again"); | |
697 | userauth(authctxt, NULL); | |
698 | return; | |
699 | } | |
0fff78ff | 700 | } |
701 | ||
702 | void | |
703 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
704 | { | |
705 | Authctxt *authctxt = ctxt; | |
0fff78ff | 706 | gss_buffer_desc recv_tok; |
cdd66111 | 707 | OM_uint32 status; |
0fff78ff | 708 | u_int slen; |
709 | ||
710 | if (authctxt == NULL) | |
711 | fatal("input_gssapi_response: no authentication context"); | |
0fff78ff | 712 | |
713 | recv_tok.value = packet_get_string(&slen); | |
714 | recv_tok.length = slen; /* safe typecast */ | |
715 | ||
716 | packet_check_eom(); | |
717 | ||
cdd66111 | 718 | status = process_gssapi_token(ctxt, &recv_tok); |
0fff78ff | 719 | |
720 | xfree(recv_tok.value); | |
721 | ||
722 | if (GSS_ERROR(status)) { | |
0fff78ff | 723 | /* Start again with the next method in the list */ |
724 | userauth(authctxt, NULL); | |
725 | return; | |
726 | } | |
3c0ef626 | 727 | } |
728 | ||
0fff78ff | 729 | void |
730 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
731 | { | |
732 | Authctxt *authctxt = ctxt; | |
733 | Gssctxt *gssctxt; | |
734 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
735 | gss_buffer_desc recv_tok; | |
736 | OM_uint32 status, ms; | |
737 | u_int len; | |
738 | ||
739 | if (authctxt == NULL) | |
740 | fatal("input_gssapi_response: no authentication context"); | |
741 | gssctxt = authctxt->methoddata; | |
742 | ||
743 | recv_tok.value = packet_get_string(&len); | |
744 | recv_tok.length = len; | |
745 | ||
746 | packet_check_eom(); | |
747 | ||
748 | /* Stick it into GSSAPI and see what it says */ | |
749 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
665a873d | 750 | &recv_tok, &send_tok, NULL); |
0fff78ff | 751 | |
752 | xfree(recv_tok.value); | |
753 | gss_release_buffer(&ms, &send_tok); | |
754 | ||
755 | /* Server will be returning a failed packet after this one */ | |
756 | } | |
757 | ||
758 | void | |
759 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
760 | { | |
761 | OM_uint32 maj, min; | |
762 | char *msg; | |
763 | char *lang; | |
764 | ||
765 | maj=packet_get_int(); | |
766 | min=packet_get_int(); | |
767 | msg=packet_get_string(NULL); | |
768 | lang=packet_get_string(NULL); | |
769 | ||
770 | packet_check_eom(); | |
771 | ||
2c06c99b | 772 | debug("Server GSSAPI Error:\n%s", msg); |
0fff78ff | 773 | xfree(msg); |
774 | xfree(lang); | |
775 | } | |
d617aef3 | 776 | |
777 | int | |
778 | userauth_gsskeyex(Authctxt *authctxt) | |
779 | { | |
780 | Buffer b; | |
781 | gss_buffer_desc gssbuf; | |
782 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; | |
783 | OM_uint32 ms; | |
784 | ||
785 | static int attempt = 0; | |
786 | if (attempt++ >= 1) | |
787 | return (0); | |
788 | ||
789 | if (gss_kex_context == NULL) { | |
790 | debug("No valid Key exchange context"); | |
791 | return (0); | |
792 | } | |
793 | ||
794 | ssh_gssapi_buildmic(&b, authctxt->server_user, authctxt->service, | |
795 | "gssapi-keyex"); | |
796 | ||
797 | gssbuf.value = buffer_ptr(&b); | |
798 | gssbuf.length = buffer_len(&b); | |
799 | ||
800 | if (GSS_ERROR(ssh_gssapi_sign(gss_kex_context, &gssbuf, &mic))) { | |
801 | buffer_free(&b); | |
802 | return (0); | |
803 | } | |
804 | ||
805 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
806 | packet_put_cstring(authctxt->server_user); | |
807 | packet_put_cstring(authctxt->service); | |
808 | packet_put_cstring(authctxt->method->name); | |
809 | packet_put_string(mic.value, mic.length); | |
810 | packet_send(); | |
811 | ||
812 | buffer_free(&b); | |
813 | gss_release_buffer(&ms, &mic); | |
814 | ||
815 | return (1); | |
816 | } | |
817 | ||
0fff78ff | 818 | #endif /* GSSAPI */ |
819 | ||
3c0ef626 | 820 | int |
821 | userauth_none(Authctxt *authctxt) | |
822 | { | |
823 | /* initial userauth request */ | |
824 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
825 | packet_put_cstring(authctxt->server_user); | |
826 | packet_put_cstring(authctxt->service); | |
827 | packet_put_cstring(authctxt->method->name); | |
828 | packet_send(); | |
829 | return 1; | |
830 | } | |
831 | ||
832 | int | |
833 | userauth_passwd(Authctxt *authctxt) | |
834 | { | |
835 | static int attempt = 0; | |
700318f3 | 836 | char prompt[150]; |
3c0ef626 | 837 | char *password; |
838 | ||
839 | if (attempt++ >= options.number_of_password_prompts) | |
840 | return 0; | |
841 | ||
e9a17296 | 842 | if (attempt != 1) |
3c0ef626 | 843 | error("Permission denied, please try again."); |
844 | ||
845 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", | |
846 | authctxt->server_user, authctxt->host); | |
847 | password = read_passphrase(prompt, 0); | |
848 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
849 | packet_put_cstring(authctxt->server_user); | |
850 | packet_put_cstring(authctxt->service); | |
851 | packet_put_cstring(authctxt->method->name); | |
852 | packet_put_char(0); | |
853 | packet_put_cstring(password); | |
854 | memset(password, 0, strlen(password)); | |
855 | xfree(password); | |
856 | packet_add_padding(64); | |
857 | packet_send(); | |
700318f3 | 858 | |
f5799ae1 | 859 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
700318f3 | 860 | &input_userauth_passwd_changereq); |
861 | ||
3c0ef626 | 862 | return 1; |
863 | } | |
700318f3 | 864 | /* |
865 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
866 | */ | |
867 | void | |
868 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) | |
869 | { | |
870 | Authctxt *authctxt = ctxt; | |
871 | char *info, *lang, *password = NULL, *retype = NULL; | |
872 | char prompt[150]; | |
873 | ||
874 | debug2("input_userauth_passwd_changereq"); | |
875 | ||
876 | if (authctxt == NULL) | |
877 | fatal("input_userauth_passwd_changereq: " | |
878 | "no authentication context"); | |
879 | ||
880 | info = packet_get_string(NULL); | |
881 | lang = packet_get_string(NULL); | |
882 | if (strlen(info) > 0) | |
0fff78ff | 883 | logit("%s", info); |
700318f3 | 884 | xfree(info); |
885 | xfree(lang); | |
886 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
887 | packet_put_cstring(authctxt->server_user); | |
888 | packet_put_cstring(authctxt->service); | |
889 | packet_put_cstring(authctxt->method->name); | |
890 | packet_put_char(1); /* additional info */ | |
f5799ae1 | 891 | snprintf(prompt, sizeof(prompt), |
700318f3 | 892 | "Enter %.30s@%.128s's old password: ", |
893 | authctxt->server_user, authctxt->host); | |
894 | password = read_passphrase(prompt, 0); | |
895 | packet_put_cstring(password); | |
896 | memset(password, 0, strlen(password)); | |
897 | xfree(password); | |
898 | password = NULL; | |
899 | while (password == NULL) { | |
f5799ae1 | 900 | snprintf(prompt, sizeof(prompt), |
700318f3 | 901 | "Enter %.30s@%.128s's new password: ", |
902 | authctxt->server_user, authctxt->host); | |
903 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
904 | if (password == NULL) { | |
905 | /* bail out */ | |
906 | return; | |
907 | } | |
f5799ae1 | 908 | snprintf(prompt, sizeof(prompt), |
700318f3 | 909 | "Retype %.30s@%.128s's new password: ", |
910 | authctxt->server_user, authctxt->host); | |
911 | retype = read_passphrase(prompt, 0); | |
912 | if (strcmp(password, retype) != 0) { | |
913 | memset(password, 0, strlen(password)); | |
914 | xfree(password); | |
0fff78ff | 915 | logit("Mismatch; try again, EOF to quit."); |
700318f3 | 916 | password = NULL; |
917 | } | |
918 | memset(retype, 0, strlen(retype)); | |
919 | xfree(retype); | |
920 | } | |
921 | packet_put_cstring(password); | |
922 | memset(password, 0, strlen(password)); | |
923 | xfree(password); | |
924 | packet_add_padding(64); | |
925 | packet_send(); | |
f5799ae1 | 926 | |
927 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
700318f3 | 928 | &input_userauth_passwd_changereq); |
929 | } | |
3c0ef626 | 930 | |
0fff78ff | 931 | static int |
932 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
933 | u_char *data, u_int datalen) | |
3c0ef626 | 934 | { |
0fff78ff | 935 | Key *prv; |
936 | int ret; | |
700318f3 | 937 | |
0fff78ff | 938 | /* the agent supports this key */ |
939 | if (id->ac) | |
940 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
941 | data, datalen)); | |
942 | /* | |
943 | * we have already loaded the private key or | |
944 | * the private key is stored in external hardware | |
945 | */ | |
946 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
947 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
948 | /* load the private key from the file */ | |
949 | if ((prv = load_identity_file(id->filename)) == NULL) | |
950 | return (-1); | |
951 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
952 | key_free(prv); | |
953 | return (ret); | |
3c0ef626 | 954 | } |
955 | ||
956 | static int | |
0fff78ff | 957 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
3c0ef626 | 958 | { |
959 | Buffer b; | |
960 | u_char *blob, *signature; | |
e9a17296 | 961 | u_int bloblen, slen; |
0fff78ff | 962 | u_int skip = 0; |
3c0ef626 | 963 | int ret = -1; |
964 | int have_sig = 1; | |
965 | ||
966 | debug3("sign_and_send_pubkey"); | |
967 | ||
0fff78ff | 968 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 969 | /* we cannot handle this key */ |
970 | debug3("sign_and_send_pubkey: cannot handle key"); | |
971 | return 0; | |
972 | } | |
973 | /* data to be signed */ | |
974 | buffer_init(&b); | |
975 | if (datafellows & SSH_OLD_SESSIONID) { | |
976 | buffer_append(&b, session_id2, session_id2_len); | |
977 | skip = session_id2_len; | |
978 | } else { | |
979 | buffer_put_string(&b, session_id2, session_id2_len); | |
980 | skip = buffer_len(&b); | |
981 | } | |
982 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
983 | buffer_put_cstring(&b, authctxt->server_user); | |
984 | buffer_put_cstring(&b, | |
985 | datafellows & SSH_BUG_PKSERVICE ? | |
986 | "ssh-userauth" : | |
987 | authctxt->service); | |
988 | if (datafellows & SSH_BUG_PKAUTH) { | |
989 | buffer_put_char(&b, have_sig); | |
990 | } else { | |
991 | buffer_put_cstring(&b, authctxt->method->name); | |
992 | buffer_put_char(&b, have_sig); | |
0fff78ff | 993 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 994 | } |
995 | buffer_put_string(&b, blob, bloblen); | |
996 | ||
997 | /* generate signature */ | |
0fff78ff | 998 | ret = identity_sign(id, &signature, &slen, |
3c0ef626 | 999 | buffer_ptr(&b), buffer_len(&b)); |
1000 | if (ret == -1) { | |
1001 | xfree(blob); | |
1002 | buffer_free(&b); | |
1003 | return 0; | |
1004 | } | |
1005 | #ifdef DEBUG_PK | |
1006 | buffer_dump(&b); | |
1007 | #endif | |
1008 | if (datafellows & SSH_BUG_PKSERVICE) { | |
1009 | buffer_clear(&b); | |
1010 | buffer_append(&b, session_id2, session_id2_len); | |
1011 | skip = session_id2_len; | |
1012 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1013 | buffer_put_cstring(&b, authctxt->server_user); | |
1014 | buffer_put_cstring(&b, authctxt->service); | |
1015 | buffer_put_cstring(&b, authctxt->method->name); | |
1016 | buffer_put_char(&b, have_sig); | |
1017 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
0fff78ff | 1018 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 1019 | buffer_put_string(&b, blob, bloblen); |
1020 | } | |
1021 | xfree(blob); | |
1022 | ||
1023 | /* append signature */ | |
1024 | buffer_put_string(&b, signature, slen); | |
1025 | xfree(signature); | |
1026 | ||
1027 | /* skip session id and packet type */ | |
1028 | if (buffer_len(&b) < skip + 1) | |
1029 | fatal("userauth_pubkey: internal error"); | |
1030 | buffer_consume(&b, skip + 1); | |
1031 | ||
1032 | /* put remaining data from buffer into packet */ | |
1033 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1034 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
1035 | buffer_free(&b); | |
1036 | packet_send(); | |
1037 | ||
1038 | return 1; | |
1039 | } | |
1040 | ||
1041 | static int | |
0fff78ff | 1042 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1043 | { |
1044 | u_char *blob; | |
e9a17296 | 1045 | u_int bloblen, have_sig = 0; |
3c0ef626 | 1046 | |
1047 | debug3("send_pubkey_test"); | |
1048 | ||
0fff78ff | 1049 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1050 | /* we cannot handle this key */ |
1051 | debug3("send_pubkey_test: cannot handle key"); | |
1052 | return 0; | |
1053 | } | |
1054 | /* register callback for USERAUTH_PK_OK message */ | |
3c0ef626 | 1055 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
1056 | ||
1057 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1058 | packet_put_cstring(authctxt->server_user); | |
1059 | packet_put_cstring(authctxt->service); | |
1060 | packet_put_cstring(authctxt->method->name); | |
1061 | packet_put_char(have_sig); | |
1062 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
0fff78ff | 1063 | packet_put_cstring(key_ssh_name(id->key)); |
3c0ef626 | 1064 | packet_put_string(blob, bloblen); |
1065 | xfree(blob); | |
1066 | packet_send(); | |
1067 | return 1; | |
1068 | } | |
1069 | ||
1070 | static Key * | |
1071 | load_identity_file(char *filename) | |
1072 | { | |
1073 | Key *private; | |
1074 | char prompt[300], *passphrase; | |
9108f8d9 | 1075 | int perm_ok, quit, i; |
3c0ef626 | 1076 | struct stat st; |
1077 | ||
1078 | if (stat(filename, &st) < 0) { | |
1079 | debug3("no such identity: %s", filename); | |
1080 | return NULL; | |
1081 | } | |
9108f8d9 | 1082 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
1083 | if (!perm_ok) | |
1084 | return NULL; | |
3c0ef626 | 1085 | if (private == NULL) { |
1086 | if (options.batch_mode) | |
1087 | return NULL; | |
1088 | snprintf(prompt, sizeof prompt, | |
e9a17296 | 1089 | "Enter passphrase for key '%.100s': ", filename); |
3c0ef626 | 1090 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1091 | passphrase = read_passphrase(prompt, 0); | |
1092 | if (strcmp(passphrase, "") != 0) { | |
9108f8d9 | 1093 | private = key_load_private_type(KEY_UNSPEC, |
1094 | filename, passphrase, NULL, NULL); | |
3c0ef626 | 1095 | quit = 0; |
1096 | } else { | |
1097 | debug2("no passphrase given, try next key"); | |
1098 | quit = 1; | |
1099 | } | |
1100 | memset(passphrase, 0, strlen(passphrase)); | |
1101 | xfree(passphrase); | |
1102 | if (private != NULL || quit) | |
1103 | break; | |
1104 | debug2("bad passphrase given, try again..."); | |
1105 | } | |
1106 | } | |
1107 | return private; | |
1108 | } | |
1109 | ||
0fff78ff | 1110 | /* |
1111 | * try keys in the following order: | |
1112 | * 1. agent keys that are found in the config file | |
1113 | * 2. other agent keys | |
1114 | * 3. keys that are only listed in the config file | |
1115 | */ | |
1116 | static void | |
1117 | pubkey_prepare(Authctxt *authctxt) | |
3c0ef626 | 1118 | { |
0fff78ff | 1119 | Identity *id; |
1120 | Idlist agent, files, *preferred; | |
1121 | Key *key; | |
1122 | AuthenticationConnection *ac; | |
1123 | char *comment; | |
1124 | int i, found; | |
1125 | ||
1126 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1127 | TAILQ_INIT(&files); /* keys from the config file */ | |
1128 | preferred = &authctxt->keys; | |
1129 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1130 | ||
1131 | /* list of keys stored in the filesystem */ | |
1132 | for (i = 0; i < options.num_identity_files; i++) { | |
1133 | key = options.identity_keys[i]; | |
1134 | if (key && key->type == KEY_RSA1) | |
1135 | continue; | |
1136 | options.identity_keys[i] = NULL; | |
9108f8d9 | 1137 | id = xcalloc(1, sizeof(*id)); |
0fff78ff | 1138 | id->key = key; |
1139 | id->filename = xstrdup(options.identity_files[i]); | |
1140 | TAILQ_INSERT_TAIL(&files, id, next); | |
1141 | } | |
1142 | /* list of keys supported by the agent */ | |
1143 | if ((ac = ssh_get_authentication_connection())) { | |
1144 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1145 | key != NULL; | |
1146 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1147 | found = 0; | |
1148 | TAILQ_FOREACH(id, &files, next) { | |
cdd66111 | 1149 | /* agent keys from the config file are preferred */ |
0fff78ff | 1150 | if (key_equal(key, id->key)) { |
1151 | key_free(key); | |
1152 | xfree(comment); | |
1153 | TAILQ_REMOVE(&files, id, next); | |
1154 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1155 | id->ac = ac; | |
1156 | found = 1; | |
1157 | break; | |
1158 | } | |
1159 | } | |
99be0775 | 1160 | if (!found && !options.identities_only) { |
9108f8d9 | 1161 | id = xcalloc(1, sizeof(*id)); |
0fff78ff | 1162 | id->key = key; |
1163 | id->filename = comment; | |
1164 | id->ac = ac; | |
1165 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1166 | } | |
1167 | } | |
1168 | /* append remaining agent keys */ | |
1169 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1170 | TAILQ_REMOVE(&agent, id, next); | |
1171 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1172 | } | |
1173 | authctxt->agent = ac; | |
1174 | } | |
1175 | /* append remaining keys from the config file */ | |
1176 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1177 | TAILQ_REMOVE(&files, id, next); | |
1178 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1179 | } | |
1180 | TAILQ_FOREACH(id, preferred, next) { | |
1181 | debug2("key: %s (%p)", id->filename, id->key); | |
1182 | } | |
3c0ef626 | 1183 | } |
1184 | ||
0fff78ff | 1185 | static void |
1186 | pubkey_cleanup(Authctxt *authctxt) | |
3c0ef626 | 1187 | { |
0fff78ff | 1188 | Identity *id; |
1189 | ||
1190 | if (authctxt->agent != NULL) | |
1191 | ssh_close_authentication_connection(authctxt->agent); | |
1192 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1193 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1194 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1195 | if (id->key) | |
1196 | key_free(id->key); | |
1197 | if (id->filename) | |
1198 | xfree(id->filename); | |
1199 | xfree(id); | |
3c0ef626 | 1200 | } |
3c0ef626 | 1201 | } |
1202 | ||
1203 | int | |
1204 | userauth_pubkey(Authctxt *authctxt) | |
1205 | { | |
0fff78ff | 1206 | Identity *id; |
3c0ef626 | 1207 | int sent = 0; |
0fff78ff | 1208 | |
1209 | while ((id = TAILQ_FIRST(&authctxt->keys))) { | |
1210 | if (id->tried++) | |
1211 | return (0); | |
cdd66111 | 1212 | /* move key to the end of the queue */ |
0fff78ff | 1213 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1214 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1215 | /* | |
1216 | * send a test message if we have the public key. for | |
1217 | * encrypted keys we cannot do this and have to load the | |
1218 | * private key instead | |
1219 | */ | |
1220 | if (id->key && id->key->type != KEY_RSA1) { | |
1221 | debug("Offering public key: %s", id->filename); | |
1222 | sent = send_pubkey_test(authctxt, id); | |
1223 | } else if (id->key == NULL) { | |
1224 | debug("Trying private key: %s", id->filename); | |
1225 | id->key = load_identity_file(id->filename); | |
1226 | if (id->key != NULL) { | |
1227 | id->isprivate = 1; | |
1228 | sent = sign_and_send_pubkey(authctxt, id); | |
1229 | key_free(id->key); | |
1230 | id->key = NULL; | |
3c0ef626 | 1231 | } |
3c0ef626 | 1232 | } |
0fff78ff | 1233 | if (sent) |
1234 | return (sent); | |
3c0ef626 | 1235 | } |
0fff78ff | 1236 | return (0); |
3c0ef626 | 1237 | } |
1238 | ||
1239 | /* | |
1240 | * Send userauth request message specifying keyboard-interactive method. | |
1241 | */ | |
1242 | int | |
1243 | userauth_kbdint(Authctxt *authctxt) | |
1244 | { | |
1245 | static int attempt = 0; | |
1246 | ||
1247 | if (attempt++ >= options.number_of_password_prompts) | |
1248 | return 0; | |
1249 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ | |
1250 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1251 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1252 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | debug2("userauth_kbdint"); | |
1257 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1258 | packet_put_cstring(authctxt->server_user); | |
1259 | packet_put_cstring(authctxt->service); | |
1260 | packet_put_cstring(authctxt->method->name); | |
1261 | packet_put_cstring(""); /* lang */ | |
1262 | packet_put_cstring(options.kbd_interactive_devices ? | |
1263 | options.kbd_interactive_devices : ""); | |
1264 | packet_send(); | |
1265 | ||
1266 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1267 | return 1; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE | |
1272 | */ | |
1273 | void | |
e9a17296 | 1274 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1275 | { |
1276 | Authctxt *authctxt = ctxt; | |
1277 | char *name, *inst, *lang, *prompt, *response; | |
1278 | u_int num_prompts, i; | |
1279 | int echo = 0; | |
1280 | ||
1281 | debug2("input_userauth_info_req"); | |
1282 | ||
1283 | if (authctxt == NULL) | |
1284 | fatal("input_userauth_info_req: no authentication context"); | |
1285 | ||
1286 | authctxt->info_req_seen = 1; | |
1287 | ||
1288 | name = packet_get_string(NULL); | |
1289 | inst = packet_get_string(NULL); | |
1290 | lang = packet_get_string(NULL); | |
1291 | if (strlen(name) > 0) | |
0fff78ff | 1292 | logit("%s", name); |
3c0ef626 | 1293 | if (strlen(inst) > 0) |
0fff78ff | 1294 | logit("%s", inst); |
3c0ef626 | 1295 | xfree(name); |
1296 | xfree(inst); | |
1297 | xfree(lang); | |
1298 | ||
1299 | num_prompts = packet_get_int(); | |
1300 | /* | |
1301 | * Begin to build info response packet based on prompts requested. | |
1302 | * We commit to providing the correct number of responses, so if | |
1303 | * further on we run into a problem that prevents this, we have to | |
1304 | * be sure and clean this up and send a correct error response. | |
1305 | */ | |
1306 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1307 | packet_put_int(num_prompts); | |
1308 | ||
1309 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); | |
1310 | for (i = 0; i < num_prompts; i++) { | |
1311 | prompt = packet_get_string(NULL); | |
1312 | echo = packet_get_char(); | |
1313 | ||
1314 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); | |
1315 | ||
1316 | packet_put_cstring(response); | |
1317 | memset(response, 0, strlen(response)); | |
1318 | xfree(response); | |
1319 | xfree(prompt); | |
1320 | } | |
e9a17296 | 1321 | packet_check_eom(); /* done with parsing incoming message. */ |
3c0ef626 | 1322 | |
1323 | packet_add_padding(64); | |
1324 | packet_send(); | |
1325 | } | |
1326 | ||
f5799ae1 | 1327 | static int |
680cee3b | 1328 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
f5799ae1 | 1329 | u_char *data, u_int datalen) |
1330 | { | |
1331 | Buffer b; | |
1332 | struct stat st; | |
1333 | pid_t pid; | |
1334 | int to[2], from[2], status, version = 2; | |
1335 | ||
6a9b3198 | 1336 | debug2("ssh_keysign called"); |
f5799ae1 | 1337 | |
1338 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { | |
1339 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1340 | return -1; | |
1341 | } | |
1342 | if (fflush(stdout) != 0) | |
1343 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1344 | if (pipe(to) < 0) { | |
1345 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1346 | return -1; | |
1347 | } | |
1348 | if (pipe(from) < 0) { | |
1349 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1350 | return -1; | |
1351 | } | |
1352 | if ((pid = fork()) < 0) { | |
1353 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1354 | return -1; | |
1355 | } | |
1356 | if (pid == 0) { | |
9108f8d9 | 1357 | permanently_drop_suid(getuid()); |
f5799ae1 | 1358 | close(from[0]); |
1359 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1360 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1361 | close(to[1]); | |
1362 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1363 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1364 | close(from[1]); | |
1365 | close(to[0]); | |
1366 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); | |
1367 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, | |
1368 | strerror(errno)); | |
1369 | } | |
1370 | close(from[1]); | |
1371 | close(to[0]); | |
1372 | ||
1373 | buffer_init(&b); | |
1374 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ | |
1375 | buffer_put_string(&b, data, datalen); | |
cdd66111 | 1376 | if (ssh_msg_send(to[1], version, &b) == -1) |
1377 | fatal("ssh_keysign: couldn't send request"); | |
f5799ae1 | 1378 | |
41b2f314 | 1379 | if (ssh_msg_recv(from[0], &b) < 0) { |
f5799ae1 | 1380 | error("ssh_keysign: no reply"); |
cdd66111 | 1381 | buffer_free(&b); |
f5799ae1 | 1382 | return -1; |
1383 | } | |
1384 | close(from[0]); | |
1385 | close(to[1]); | |
1386 | ||
1387 | while (waitpid(pid, &status, 0) < 0) | |
1388 | if (errno != EINTR) | |
1389 | break; | |
1390 | ||
1391 | if (buffer_get_char(&b) != version) { | |
1392 | error("ssh_keysign: bad version"); | |
cdd66111 | 1393 | buffer_free(&b); |
f5799ae1 | 1394 | return -1; |
1395 | } | |
1396 | *sigp = buffer_get_string(&b, lenp); | |
cdd66111 | 1397 | buffer_free(&b); |
f5799ae1 | 1398 | |
1399 | return 0; | |
1400 | } | |
1401 | ||
3c0ef626 | 1402 | int |
1403 | userauth_hostbased(Authctxt *authctxt) | |
1404 | { | |
1405 | Key *private = NULL; | |
f5799ae1 | 1406 | Sensitive *sensitive = authctxt->sensitive; |
3c0ef626 | 1407 | Buffer b; |
1408 | u_char *signature, *blob; | |
1409 | char *chost, *pkalg, *p; | |
1410 | const char *service; | |
1411 | u_int blen, slen; | |
1412 | int ok, i, len, found = 0; | |
1413 | ||
1414 | /* check for a useful key */ | |
f5799ae1 | 1415 | for (i = 0; i < sensitive->nkeys; i++) { |
1416 | private = sensitive->keys[i]; | |
3c0ef626 | 1417 | if (private && private->type != KEY_RSA1) { |
1418 | found = 1; | |
1419 | /* we take and free the key */ | |
f5799ae1 | 1420 | sensitive->keys[i] = NULL; |
3c0ef626 | 1421 | break; |
1422 | } | |
1423 | } | |
1424 | if (!found) { | |
6a9b3198 | 1425 | debug("No more client hostkeys for hostbased authentication."); |
3c0ef626 | 1426 | return 0; |
1427 | } | |
1428 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1429 | key_free(private); | |
1430 | return 0; | |
1431 | } | |
1432 | /* figure out a name for the client host */ | |
1433 | p = get_local_name(packet_get_connection_in()); | |
1434 | if (p == NULL) { | |
1435 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1436 | key_free(private); | |
9108f8d9 | 1437 | xfree(blob); |
3c0ef626 | 1438 | return 0; |
1439 | } | |
1440 | len = strlen(p) + 2; | |
9108f8d9 | 1441 | xasprintf(&chost, "%s.", p); |
3c0ef626 | 1442 | debug2("userauth_hostbased: chost %s", chost); |
6a9b3198 | 1443 | xfree(p); |
3c0ef626 | 1444 | |
1445 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : | |
1446 | authctxt->service; | |
1447 | pkalg = xstrdup(key_ssh_name(private)); | |
1448 | buffer_init(&b); | |
1449 | /* construct data */ | |
1450 | buffer_put_string(&b, session_id2, session_id2_len); | |
1451 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1452 | buffer_put_cstring(&b, authctxt->server_user); | |
1453 | buffer_put_cstring(&b, service); | |
1454 | buffer_put_cstring(&b, authctxt->method->name); | |
1455 | buffer_put_cstring(&b, pkalg); | |
1456 | buffer_put_string(&b, blob, blen); | |
1457 | buffer_put_cstring(&b, chost); | |
1458 | buffer_put_cstring(&b, authctxt->local_user); | |
1459 | #ifdef DEBUG_PK | |
1460 | buffer_dump(&b); | |
1461 | #endif | |
f5799ae1 | 1462 | if (sensitive->external_keysign) |
1463 | ok = ssh_keysign(private, &signature, &slen, | |
1464 | buffer_ptr(&b), buffer_len(&b)); | |
1465 | else | |
1466 | ok = key_sign(private, &signature, &slen, | |
1467 | buffer_ptr(&b), buffer_len(&b)); | |
3c0ef626 | 1468 | key_free(private); |
1469 | buffer_free(&b); | |
1470 | if (ok != 0) { | |
1471 | error("key_sign failed"); | |
1472 | xfree(chost); | |
1473 | xfree(pkalg); | |
9108f8d9 | 1474 | xfree(blob); |
3c0ef626 | 1475 | return 0; |
1476 | } | |
1477 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1478 | packet_put_cstring(authctxt->server_user); | |
1479 | packet_put_cstring(authctxt->service); | |
1480 | packet_put_cstring(authctxt->method->name); | |
1481 | packet_put_cstring(pkalg); | |
1482 | packet_put_string(blob, blen); | |
1483 | packet_put_cstring(chost); | |
1484 | packet_put_cstring(authctxt->local_user); | |
1485 | packet_put_string(signature, slen); | |
1486 | memset(signature, 's', slen); | |
1487 | xfree(signature); | |
1488 | xfree(chost); | |
1489 | xfree(pkalg); | |
9108f8d9 | 1490 | xfree(blob); |
3c0ef626 | 1491 | |
1492 | packet_send(); | |
1493 | return 1; | |
1494 | } | |
1495 | ||
1496 | /* find auth method */ | |
1497 | ||
1498 | /* | |
1499 | * given auth method name, if configurable options permit this method fill | |
1500 | * in auth_ident field and return true, otherwise return false. | |
1501 | */ | |
1502 | static int | |
1503 | authmethod_is_enabled(Authmethod *method) | |
1504 | { | |
1505 | if (method == NULL) | |
1506 | return 0; | |
1507 | /* return false if options indicate this method is disabled */ | |
1508 | if (method->enabled == NULL || *method->enabled == 0) | |
1509 | return 0; | |
1510 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1511 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1512 | return 0; | |
1513 | return 1; | |
1514 | } | |
1515 | ||
1516 | static Authmethod * | |
1517 | authmethod_lookup(const char *name) | |
1518 | { | |
1519 | Authmethod *method = NULL; | |
1520 | if (name != NULL) | |
1521 | for (method = authmethods; method->name != NULL; method++) | |
1522 | if (strcmp(name, method->name) == 0) | |
1523 | return method; | |
1524 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1525 | return NULL; | |
1526 | } | |
1527 | ||
1528 | /* XXX internal state */ | |
1529 | static Authmethod *current = NULL; | |
1530 | static char *supported = NULL; | |
1531 | static char *preferred = NULL; | |
680cee3b | 1532 | |
3c0ef626 | 1533 | /* |
1534 | * Given the authentication method list sent by the server, return the | |
1535 | * next method we should try. If the server initially sends a nil list, | |
1536 | * use a built-in default list. | |
1537 | */ | |
1538 | static Authmethod * | |
1539 | authmethod_get(char *authlist) | |
1540 | { | |
3c0ef626 | 1541 | char *name = NULL; |
e9a17296 | 1542 | u_int next; |
3c0ef626 | 1543 | |
1544 | /* Use a suitable default if we're passed a nil list. */ | |
1545 | if (authlist == NULL || strlen(authlist) == 0) | |
1546 | authlist = options.preferred_authentications; | |
1547 | ||
1548 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1549 | debug3("start over, passed a different list %s", authlist); | |
1550 | if (supported != NULL) | |
1551 | xfree(supported); | |
1552 | supported = xstrdup(authlist); | |
1553 | preferred = options.preferred_authentications; | |
1554 | debug3("preferred %s", preferred); | |
1555 | current = NULL; | |
1556 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1557 | return current; | |
1558 | ||
1559 | for (;;) { | |
1560 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6a9b3198 | 1561 | debug("No more authentication methods to try."); |
3c0ef626 | 1562 | current = NULL; |
1563 | return NULL; | |
1564 | } | |
1565 | preferred += next; | |
1566 | debug3("authmethod_lookup %s", name); | |
1567 | debug3("remaining preferred: %s", preferred); | |
1568 | if ((current = authmethod_lookup(name)) != NULL && | |
1569 | authmethod_is_enabled(current)) { | |
1570 | debug3("authmethod_is_enabled %s", name); | |
6a9b3198 | 1571 | debug("Next authentication method: %s", name); |
3c0ef626 | 1572 | return current; |
1573 | } | |
1574 | } | |
1575 | } | |
1576 | ||
3c0ef626 | 1577 | static char * |
1578 | authmethods_get(void) | |
1579 | { | |
1580 | Authmethod *method = NULL; | |
e9a17296 | 1581 | Buffer b; |
1582 | char *list; | |
3c0ef626 | 1583 | |
e9a17296 | 1584 | buffer_init(&b); |
3c0ef626 | 1585 | for (method = authmethods; method->name != NULL; method++) { |
1586 | if (authmethod_is_enabled(method)) { | |
e9a17296 | 1587 | if (buffer_len(&b) > 0) |
1588 | buffer_append(&b, ",", 1); | |
1589 | buffer_append(&b, method->name, strlen(method->name)); | |
3c0ef626 | 1590 | } |
1591 | } | |
e9a17296 | 1592 | buffer_append(&b, "\0", 1); |
1593 | list = xstrdup(buffer_ptr(&b)); | |
1594 | buffer_free(&b); | |
1595 | return list; | |
3c0ef626 | 1596 | } |