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