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3c0ef626 | 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. | |
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" | |
70791e56 | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.124 2003/08/25 10:33:33 djm Exp $"); |
27 | ||
28 | #include "openbsd-compat/sys-queue.h" | |
3c0ef626 | 29 | |
30 | #include "ssh.h" | |
31 | #include "ssh2.h" | |
32 | #include "xmalloc.h" | |
3c0ef626 | 33 | #include "buffer.h" |
34 | #include "packet.h" | |
3c0ef626 | 35 | #include "compat.h" |
36 | #include "bufaux.h" | |
37 | #include "cipher.h" | |
38 | #include "kex.h" | |
39 | #include "myproposal.h" | |
3c0ef626 | 40 | #include "sshconnect.h" |
41 | #include "authfile.h" | |
42 | #include "dh.h" | |
43 | #include "authfd.h" | |
44 | #include "log.h" | |
45 | #include "readconf.h" | |
46 | #include "readpass.h" | |
47 | #include "match.h" | |
48 | #include "dispatch.h" | |
49 | #include "canohost.h" | |
ff2d7a98 | 50 | #include "msg.h" |
51 | #include "pathnames.h" | |
3c0ef626 | 52 | |
b9a54c29 | 53 | #ifdef GSSAPI |
54 | #include "ssh-gss.h" | |
55 | #endif | |
56 | ||
3c0ef626 | 57 | /* import */ |
58 | extern char *client_version_string; | |
59 | extern char *server_version_string; | |
60 | extern Options options; | |
61 | ||
62 | /* | |
63 | * SSH2 key exchange | |
64 | */ | |
65 | ||
66 | u_char *session_id2 = NULL; | |
70791e56 | 67 | u_int session_id2_len = 0; |
3c0ef626 | 68 | |
69 | char *xxx_host; | |
70 | struct sockaddr *xxx_hostaddr; | |
71 | ||
72 | Kex *xxx_kex = NULL; | |
73 | ||
74 | static int | |
75 | verify_host_key_callback(Key *hostkey) | |
76 | { | |
77 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) | |
78 | fatal("Host key verification failed."); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | void | |
83 | ssh_kex2(char *host, struct sockaddr *hostaddr) | |
84 | { | |
85 | Kex *kex; | |
b9a54c29 | 86 | #ifdef GSSAPI |
87 | char *orig, *gss; | |
88 | int len; | |
89 | #endif | |
3c0ef626 | 90 | |
91 | xxx_host = host; | |
92 | xxx_hostaddr = hostaddr; | |
93 | ||
b9a54c29 | 94 | #ifdef GSSAPI |
98f19977 | 95 | if (options.gss_keyex) { |
366115cd | 96 | char *canonhost; |
b9a54c29 | 97 | /* Add the GSSAPI mechanisms currently supported on this client to |
98 | * the key exchange algorithm proposal */ | |
99 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
366115cd | 100 | canonhost = xstrdup(get_canonical_hostname(1)); |
101 | resolve_localhost(&canonhost); | |
88928908 | 102 | gss = ssh_gssapi_client_mechanisms(canonhost); |
366115cd | 103 | xfree(canonhost); |
104 | canonhost=NULL; | |
b9a54c29 | 105 | if (gss) { |
106 | len = strlen(orig)+strlen(gss)+2; | |
107 | myproposal[PROPOSAL_KEX_ALGS]=xmalloc(len); | |
108 | snprintf(myproposal[PROPOSAL_KEX_ALGS],len,"%s,%s",gss,orig); | |
109 | } | |
98f19977 | 110 | } |
b9a54c29 | 111 | #endif |
112 | ||
3c0ef626 | 113 | if (options.ciphers == (char *)-1) { |
70791e56 | 114 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
3c0ef626 | 115 | options.ciphers = NULL; |
116 | } | |
117 | if (options.ciphers != NULL) { | |
118 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
119 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
120 | } | |
121 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
122 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
123 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
124 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
125 | if (options.compression) { | |
126 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
e54b3d7c | 127 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none"; |
3c0ef626 | 128 | } else { |
129 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
e54b3d7c | 130 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib"; |
3c0ef626 | 131 | } |
132 | if (options.macs != NULL) { | |
133 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
134 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
135 | } | |
136 | if (options.hostkeyalgorithms != NULL) | |
e9a17296 | 137 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
3c0ef626 | 138 | options.hostkeyalgorithms; |
139 | ||
b9a54c29 | 140 | #ifdef GSSAPI |
141 | /* If we've got GSSAPI algorithms, then we also support the | |
142 | * 'null' hostkey, as a last resort */ | |
98f19977 | 143 | if (options.gss_keyex && gss) { |
88928908 | 144 | orig=myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]; |
145 | len = strlen(orig)+sizeof(",null"); | |
146 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]=xmalloc(len); | |
147 | snprintf(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],len,"%s,null",orig); | |
b9a54c29 | 148 | } |
149 | #endif | |
70791e56 | 150 | |
151 | if (options.rekey_limit) | |
152 | packet_set_rekey_limit(options.rekey_limit); | |
153 | ||
3c0ef626 | 154 | /* start key exchange */ |
155 | kex = kex_setup(myproposal); | |
1c14df9e | 156 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
157 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
158 | #ifdef GSSAPI | |
159 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client; | |
160 | #endif | |
3c0ef626 | 161 | kex->client_version_string=client_version_string; |
162 | kex->server_version_string=server_version_string; | |
163 | kex->verify_host_key=&verify_host_key_callback; | |
b9a54c29 | 164 | #ifdef GSSAPI |
165 | kex->options.gss_deleg_creds=options.gss_deleg_creds; | |
166 | #endif | |
70791e56 | 167 | |
3c0ef626 | 168 | xxx_kex = kex; |
169 | ||
170 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
171 | ||
172 | session_id2 = kex->session_id; | |
173 | session_id2_len = kex->session_id_len; | |
174 | ||
175 | #ifdef DEBUG_KEXDH | |
176 | /* send 1st encrypted/maced/compressed message */ | |
177 | packet_start(SSH2_MSG_IGNORE); | |
178 | packet_put_cstring("markus"); | |
179 | packet_send(); | |
180 | packet_write_wait(); | |
181 | #endif | |
3c0ef626 | 182 | } |
183 | ||
184 | /* | |
185 | * Authenticate user | |
186 | */ | |
187 | ||
188 | typedef struct Authctxt Authctxt; | |
189 | typedef struct Authmethod Authmethod; | |
70791e56 | 190 | typedef struct identity Identity; |
191 | typedef struct idlist Idlist; | |
192 | ||
193 | struct identity { | |
194 | TAILQ_ENTRY(identity) next; | |
195 | AuthenticationConnection *ac; /* set if agent supports key */ | |
196 | Key *key; /* public/private key */ | |
197 | char *filename; /* comment for agent-only keys */ | |
198 | int tried; | |
199 | int isprivate; /* key points to the private key */ | |
200 | }; | |
201 | TAILQ_HEAD(idlist, identity); | |
3c0ef626 | 202 | |
203 | struct Authctxt { | |
204 | const char *server_user; | |
205 | const char *local_user; | |
206 | const char *host; | |
207 | const char *service; | |
208 | Authmethod *method; | |
209 | int success; | |
210 | char *authlist; | |
211 | /* pubkey */ | |
70791e56 | 212 | Idlist keys; |
3c0ef626 | 213 | AuthenticationConnection *agent; |
214 | /* hostbased */ | |
ff2d7a98 | 215 | Sensitive *sensitive; |
3c0ef626 | 216 | /* kbd-interactive */ |
217 | int info_req_seen; | |
b9a54c29 | 218 | /* generic */ |
219 | void *methoddata; | |
3c0ef626 | 220 | }; |
221 | struct Authmethod { | |
222 | char *name; /* string to compare against server's list */ | |
223 | int (*userauth)(Authctxt *authctxt); | |
224 | int *enabled; /* flag in option struct that enables method */ | |
225 | int *batch_flag; /* flag in option struct that disables method */ | |
226 | }; | |
227 | ||
e9a17296 | 228 | void input_userauth_success(int, u_int32_t, void *); |
229 | void input_userauth_failure(int, u_int32_t, void *); | |
230 | void input_userauth_banner(int, u_int32_t, void *); | |
231 | void input_userauth_error(int, u_int32_t, void *); | |
232 | void input_userauth_info_req(int, u_int32_t, void *); | |
233 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
2980ea68 | 234 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
3c0ef626 | 235 | |
e9a17296 | 236 | int userauth_none(Authctxt *); |
237 | int userauth_pubkey(Authctxt *); | |
238 | int userauth_passwd(Authctxt *); | |
239 | int userauth_kbdint(Authctxt *); | |
240 | int userauth_hostbased(Authctxt *); | |
70791e56 | 241 | int userauth_kerberos(Authctxt *); |
242 | ||
243 | #ifdef GSSAPI | |
244 | int userauth_gssapi(Authctxt *authctxt); | |
245 | void input_gssapi_response(int type, u_int32_t, void *); | |
246 | void input_gssapi_token(int type, u_int32_t, void *); | |
247 | void input_gssapi_hash(int type, u_int32_t, void *); | |
248 | void input_gssapi_error(int, u_int32_t, void *); | |
249 | void input_gssapi_errtok(int, u_int32_t, void *); | |
250 | #endif | |
3c0ef626 | 251 | |
b9a54c29 | 252 | #ifdef GSSAPI |
253 | int userauth_external(Authctxt *authctxt); | |
254 | int userauth_gssapi(Authctxt *authctxt); | |
88928908 | 255 | void input_gssapi_response(int type, u_int32_t, void *); |
256 | void input_gssapi_token(int type, u_int32_t, void *); | |
257 | void input_gssapi_hash(int type, u_int32_t, void *); | |
258 | void input_gssapi_error(int, u_int32_t, void *); | |
259 | void input_gssapi_errtok(int, u_int32_t, void *); | |
b9a54c29 | 260 | #endif |
261 | ||
e9a17296 | 262 | void userauth(Authctxt *, char *); |
3c0ef626 | 263 | |
70791e56 | 264 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
265 | static void pubkey_prepare(Authctxt *); | |
266 | static void pubkey_cleanup(Authctxt *); | |
267 | static Key *load_identity_file(char *); | |
3c0ef626 | 268 | |
269 | static Authmethod *authmethod_get(char *authlist); | |
270 | static Authmethod *authmethod_lookup(const char *name); | |
271 | static char *authmethods_get(void); | |
272 | ||
273 | Authmethod authmethods[] = { | |
b9a54c29 | 274 | #ifdef GSSAPI |
275 | {"external-keyx", | |
276 | userauth_external, | |
277 | &options.gss_authentication, | |
278 | NULL}, | |
279 | {"gssapi", | |
280 | userauth_gssapi, | |
281 | &options.gss_authentication, | |
282 | NULL}, | |
283 | #endif | |
3c0ef626 | 284 | {"hostbased", |
285 | userauth_hostbased, | |
286 | &options.hostbased_authentication, | |
287 | NULL}, | |
288 | {"publickey", | |
289 | userauth_pubkey, | |
290 | &options.pubkey_authentication, | |
291 | NULL}, | |
292 | {"keyboard-interactive", | |
293 | userauth_kbdint, | |
294 | &options.kbd_interactive_authentication, | |
295 | &options.batch_mode}, | |
296 | {"password", | |
297 | userauth_passwd, | |
298 | &options.password_authentication, | |
299 | &options.batch_mode}, | |
300 | {"none", | |
301 | userauth_none, | |
302 | NULL, | |
303 | NULL}, | |
304 | {NULL, NULL, NULL, NULL} | |
305 | }; | |
306 | ||
307 | void | |
308 | ssh_userauth2(const char *local_user, const char *server_user, char *host, | |
ff2d7a98 | 309 | Sensitive *sensitive) |
3c0ef626 | 310 | { |
311 | Authctxt authctxt; | |
312 | int type; | |
3c0ef626 | 313 | |
314 | if (options.challenge_response_authentication) | |
315 | options.kbd_interactive_authentication = 1; | |
316 | ||
3c0ef626 | 317 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
318 | packet_put_cstring("ssh-userauth"); | |
319 | packet_send(); | |
1c14df9e | 320 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
3c0ef626 | 321 | packet_write_wait(); |
e9a17296 | 322 | type = packet_read(); |
1c14df9e | 323 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
324 | fatal("Server denied authentication request: %d", type); | |
3c0ef626 | 325 | if (packet_remaining() > 0) { |
e9a17296 | 326 | char *reply = packet_get_string(NULL); |
1c14df9e | 327 | debug2("service_accept: %s", reply); |
3c0ef626 | 328 | xfree(reply); |
329 | } else { | |
1c14df9e | 330 | debug2("buggy server: service_accept w/o service"); |
3c0ef626 | 331 | } |
e9a17296 | 332 | packet_check_eom(); |
1c14df9e | 333 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
3c0ef626 | 334 | |
335 | if (options.preferred_authentications == NULL) | |
336 | options.preferred_authentications = authmethods_get(); | |
337 | ||
338 | /* setup authentication context */ | |
339 | memset(&authctxt, 0, sizeof(authctxt)); | |
70791e56 | 340 | pubkey_prepare(&authctxt); |
3c0ef626 | 341 | authctxt.server_user = server_user; |
342 | authctxt.local_user = local_user; | |
343 | authctxt.host = host; | |
344 | authctxt.service = "ssh-connection"; /* service name */ | |
345 | authctxt.success = 0; | |
346 | authctxt.method = authmethod_lookup("none"); | |
347 | authctxt.authlist = NULL; | |
b9a54c29 | 348 | authctxt.methoddata = NULL; |
ff2d7a98 | 349 | authctxt.sensitive = sensitive; |
3c0ef626 | 350 | authctxt.info_req_seen = 0; |
351 | if (authctxt.method == NULL) | |
352 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
353 | ||
354 | /* initial userauth request */ | |
355 | userauth_none(&authctxt); | |
356 | ||
357 | dispatch_init(&input_userauth_error); | |
358 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
359 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
360 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); | |
361 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
362 | ||
70791e56 | 363 | pubkey_cleanup(&authctxt); |
364 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); | |
3c0ef626 | 365 | |
1c14df9e | 366 | debug("Authentication succeeded (%s).", authctxt.method->name); |
3c0ef626 | 367 | } |
70791e56 | 368 | |
3c0ef626 | 369 | void |
370 | userauth(Authctxt *authctxt, char *authlist) | |
371 | { | |
70791e56 | 372 | if (authctxt->methoddata) { |
b9a54c29 | 373 | xfree(authctxt->methoddata); |
70791e56 | 374 | authctxt->methoddata = NULL; |
b9a54c29 | 375 | } |
3c0ef626 | 376 | if (authlist == NULL) { |
377 | authlist = authctxt->authlist; | |
378 | } else { | |
379 | if (authctxt->authlist) | |
380 | xfree(authctxt->authlist); | |
381 | authctxt->authlist = authlist; | |
382 | } | |
383 | for (;;) { | |
384 | Authmethod *method = authmethod_get(authlist); | |
385 | if (method == NULL) | |
386 | fatal("Permission denied (%s).", authlist); | |
387 | authctxt->method = method; | |
70791e56 | 388 | |
389 | /* reset the per method handler */ | |
390 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
391 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
392 | ||
393 | /* and try new method */ | |
3c0ef626 | 394 | if (method->userauth(authctxt) != 0) { |
395 | debug2("we sent a %s packet, wait for reply", method->name); | |
396 | break; | |
397 | } else { | |
398 | debug2("we did not send a packet, disable method"); | |
399 | method->enabled = NULL; | |
400 | } | |
401 | } | |
402 | } | |
ff2d7a98 | 403 | |
3c0ef626 | 404 | void |
e9a17296 | 405 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 406 | { |
407 | fatal("input_userauth_error: bad message during authentication: " | |
408 | "type %d", type); | |
409 | } | |
ff2d7a98 | 410 | |
3c0ef626 | 411 | void |
e9a17296 | 412 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 413 | { |
414 | char *msg, *lang; | |
415 | debug3("input_userauth_banner"); | |
416 | msg = packet_get_string(NULL); | |
417 | lang = packet_get_string(NULL); | |
70791e56 | 418 | logit("%s", msg); |
3c0ef626 | 419 | xfree(msg); |
420 | xfree(lang); | |
421 | } | |
ff2d7a98 | 422 | |
3c0ef626 | 423 | void |
e9a17296 | 424 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 425 | { |
426 | Authctxt *authctxt = ctxt; | |
427 | if (authctxt == NULL) | |
428 | fatal("input_userauth_success: no authentication context"); | |
429 | if (authctxt->authlist) | |
430 | xfree(authctxt->authlist); | |
b9a54c29 | 431 | if (authctxt->methoddata) |
432 | xfree(authctxt->methoddata); | |
3c0ef626 | 433 | authctxt->success = 1; /* break out */ |
434 | } | |
ff2d7a98 | 435 | |
3c0ef626 | 436 | void |
e9a17296 | 437 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 438 | { |
439 | Authctxt *authctxt = ctxt; | |
440 | char *authlist = NULL; | |
441 | int partial; | |
442 | ||
443 | if (authctxt == NULL) | |
444 | fatal("input_userauth_failure: no authentication context"); | |
445 | ||
446 | authlist = packet_get_string(NULL); | |
447 | partial = packet_get_char(); | |
e9a17296 | 448 | packet_check_eom(); |
3c0ef626 | 449 | |
450 | if (partial != 0) | |
70791e56 | 451 | logit("Authenticated with partial success."); |
1c14df9e | 452 | debug("Authentications that can continue: %s", authlist); |
3c0ef626 | 453 | |
3c0ef626 | 454 | userauth(authctxt, authlist); |
455 | } | |
456 | void | |
e9a17296 | 457 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 458 | { |
459 | Authctxt *authctxt = ctxt; | |
460 | Key *key = NULL; | |
70791e56 | 461 | Identity *id = NULL; |
3c0ef626 | 462 | Buffer b; |
e9a17296 | 463 | int pktype, sent = 0; |
464 | u_int alen, blen; | |
465 | char *pkalg, *fp; | |
466 | u_char *pkblob; | |
3c0ef626 | 467 | |
468 | if (authctxt == NULL) | |
469 | fatal("input_userauth_pk_ok: no authentication context"); | |
470 | if (datafellows & SSH_BUG_PKOK) { | |
471 | /* this is similar to SSH_BUG_PKAUTH */ | |
472 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
473 | pkblob = packet_get_string(&blen); | |
474 | buffer_init(&b); | |
475 | buffer_append(&b, pkblob, blen); | |
476 | pkalg = buffer_get_string(&b, &alen); | |
477 | buffer_free(&b); | |
478 | } else { | |
479 | pkalg = packet_get_string(&alen); | |
480 | pkblob = packet_get_string(&blen); | |
481 | } | |
e9a17296 | 482 | packet_check_eom(); |
3c0ef626 | 483 | |
70791e56 | 484 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
3c0ef626 | 485 | |
70791e56 | 486 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
487 | debug("unknown pkalg %s", pkalg); | |
488 | goto done; | |
489 | } | |
490 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
491 | debug("no key from blob. pkalg %s", pkalg); | |
492 | goto done; | |
493 | } | |
494 | if (key->type != pktype) { | |
495 | error("input_userauth_pk_ok: type mismatch " | |
496 | "for decoded key (received %d, expected %d)", | |
497 | key->type, pktype); | |
498 | goto done; | |
499 | } | |
500 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
501 | debug2("input_userauth_pk_ok: fp %s", fp); | |
502 | xfree(fp); | |
503 | ||
504 | TAILQ_FOREACH(id, &authctxt->keys, next) { | |
505 | if (key_equal(key, id->key)) { | |
506 | sent = sign_and_send_pubkey(authctxt, id); | |
3c0ef626 | 507 | break; |
508 | } | |
70791e56 | 509 | } |
510 | done: | |
3c0ef626 | 511 | if (key != NULL) |
512 | key_free(key); | |
513 | xfree(pkalg); | |
514 | xfree(pkblob); | |
515 | ||
e54b3d7c | 516 | /* try another method if we did not send a packet */ |
3c0ef626 | 517 | if (sent == 0) |
518 | userauth(authctxt, NULL); | |
3c0ef626 | 519 | } |
520 | ||
b9a54c29 | 521 | #ifdef GSSAPI |
522 | int | |
523 | userauth_gssapi(Authctxt *authctxt) | |
524 | { | |
88928908 | 525 | Gssctxt *gssctxt = NULL; |
526 | static gss_OID_set supported = NULL; | |
70791e56 | 527 | static int mech = 0; |
88928908 | 528 | OM_uint32 min; |
70791e56 | 529 | int ok = 0; |
530 | ||
531 | if (!options.gss_authentication) { | |
532 | verbose("GSSAPI authentication disabled."); | |
533 | return 0; | |
534 | } | |
ff2d7a98 | 535 | |
70791e56 | 536 | /* Try one GSSAPI method at a time, rather than sending them all at |
537 | * once. */ | |
538 | ||
539 | if (supported == NULL) | |
540 | gss_indicate_mechs(&min, &supported); | |
541 | ||
542 | /* Check to see if the mechanism is usable before we offer it */ | |
88928908 | 543 | while (mech<supported->count && !ok) { |
70791e56 | 544 | if (gssctxt) |
545 | ssh_gssapi_delete_ctx(&gssctxt); | |
88928908 | 546 | ssh_gssapi_build_ctx(&gssctxt); |
70791e56 | 547 | ssh_gssapi_set_oid(gssctxt, &supported->elements[mech]); |
88928908 | 548 | |
70791e56 | 549 | /* My DER encoding requires length<128 */ |
550 | if (supported->elements[mech].length < 128 && | |
88928908 | 551 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
70791e56 | 552 | authctxt->host))) { |
553 | ok = 1; /* Mechanism works */ | |
88928908 | 554 | } else { |
555 | mech++; | |
556 | } | |
b9a54c29 | 557 | } |
70791e56 | 558 | |
88928908 | 559 | if (!ok) return 0; |
70791e56 | 560 | |
b9a54c29 | 561 | authctxt->methoddata=(void *)gssctxt; |
70791e56 | 562 | |
b9a54c29 | 563 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
88928908 | 564 | packet_put_cstring(authctxt->server_user); |
b9a54c29 | 565 | packet_put_cstring(authctxt->service); |
70791e56 | 566 | packet_put_cstring(authctxt->method->name); |
567 | ||
88928908 | 568 | packet_put_int(1); |
b9a54c29 | 569 | |
70791e56 | 570 | /* Some servers encode the OID incorrectly (as we used to) */ |
88928908 | 571 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
572 | packet_put_string(supported->elements[mech].elements, | |
70791e56 | 573 | supported->elements[mech].length); |
88928908 | 574 | } else { |
575 | packet_put_int((supported->elements[mech].length)+2); | |
70791e56 | 576 | packet_put_char(SSH_GSS_OIDTYPE); |
88928908 | 577 | packet_put_char(supported->elements[mech].length); |
578 | packet_put_raw(supported->elements[mech].elements, | |
70791e56 | 579 | supported->elements[mech].length); |
88928908 | 580 | } |
98f19977 | 581 | |
70791e56 | 582 | packet_send(); |
583 | ||
584 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
585 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
586 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
587 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
b9a54c29 | 588 | |
88928908 | 589 | mech++; /* Move along to next candidate */ |
98f19977 | 590 | |
70791e56 | 591 | return 1; |
b9a54c29 | 592 | } |
593 | ||
594 | void | |
70791e56 | 595 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
b9a54c29 | 596 | { |
597 | Authctxt *authctxt = ctxt; | |
598 | Gssctxt *gssctxt; | |
70791e56 | 599 | OM_uint32 status, ms; |
b9a54c29 | 600 | int oidlen; |
601 | char *oidv; | |
70791e56 | 602 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
603 | ||
b9a54c29 | 604 | if (authctxt == NULL) |
605 | fatal("input_gssapi_response: no authentication context"); | |
606 | gssctxt = authctxt->methoddata; | |
70791e56 | 607 | |
b9a54c29 | 608 | /* Setup our OID */ |
70791e56 | 609 | oidv = packet_get_string(&oidlen); |
610 | ||
88928908 | 611 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
70791e56 | 612 | if (!ssh_gssapi_check_oid(gssctxt, oidv, oidlen)) |
88928908 | 613 | fatal("Server returned different OID than expected"); |
88928908 | 614 | } else { |
70791e56 | 615 | if(oidv[0] != SSH_GSS_OIDTYPE || oidv[1] != oidlen-2) { |
88928908 | 616 | debug("Badly encoded mechanism OID received"); |
70791e56 | 617 | userauth(authctxt, NULL); |
618 | xfree(oidv); | |
88928908 | 619 | return; |
620 | } | |
70791e56 | 621 | if (!ssh_gssapi_check_oid(gssctxt, oidv+2, oidlen-2)) |
88928908 | 622 | fatal("Server returned different OID than expected"); |
88928908 | 623 | } |
70791e56 | 624 | |
b9a54c29 | 625 | packet_check_eom(); |
70791e56 | 626 | |
627 | xfree(oidv); | |
628 | ||
b9a54c29 | 629 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
70791e56 | 630 | GSS_C_NO_BUFFER, &send_tok, NULL); |
b9a54c29 | 631 | if (GSS_ERROR(status)) { |
70791e56 | 632 | if (send_tok.length > 0) { |
88928908 | 633 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
70791e56 | 634 | packet_put_string(send_tok.value, send_tok.length); |
88928908 | 635 | packet_send(); |
70791e56 | 636 | gss_release_buffer(&ms, &send_tok); |
88928908 | 637 | } |
b9a54c29 | 638 | /* Start again with next method on list */ |
639 | debug("Trying to start again"); | |
70791e56 | 640 | userauth(authctxt, NULL); |
b9a54c29 | 641 | return; |
642 | } | |
643 | ||
70791e56 | 644 | /* We must have data to send */ |
b9a54c29 | 645 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
70791e56 | 646 | packet_put_string(send_tok.value, send_tok.length); |
b9a54c29 | 647 | packet_send(); |
b9a54c29 | 648 | gss_release_buffer(&ms, &send_tok); |
649 | } | |
650 | ||
651 | void | |
652 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
653 | { | |
654 | Authctxt *authctxt = ctxt; | |
655 | Gssctxt *gssctxt; | |
70791e56 | 656 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
657 | gss_buffer_desc recv_tok; | |
658 | OM_uint32 status, ms; | |
c2397a66 | 659 | u_int slen; |
70791e56 | 660 | |
b9a54c29 | 661 | if (authctxt == NULL) |
70791e56 | 662 | fatal("input_gssapi_response: no authentication context"); |
b9a54c29 | 663 | gssctxt = authctxt->methoddata; |
b9a54c29 | 664 | |
70791e56 | 665 | recv_tok.value = packet_get_string(&slen); |
666 | recv_tok.length = slen; /* safe typecast */ | |
b9a54c29 | 667 | |
668 | packet_check_eom(); | |
70791e56 | 669 | |
670 | status=ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
671 | &recv_tok, &send_tok, NULL); | |
672 | ||
673 | xfree(recv_tok.value); | |
674 | ||
b9a54c29 | 675 | if (GSS_ERROR(status)) { |
70791e56 | 676 | if (send_tok.length > 0) { |
88928908 | 677 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
70791e56 | 678 | packet_put_string(send_tok.value, send_tok.length); |
88928908 | 679 | packet_send(); |
70791e56 | 680 | gss_release_buffer(&ms, &send_tok); |
88928908 | 681 | } |
b9a54c29 | 682 | /* Start again with the next method in the list */ |
70791e56 | 683 | userauth(authctxt, NULL); |
b9a54c29 | 684 | return; |
685 | } | |
70791e56 | 686 | |
687 | if (send_tok.length > 0) { | |
b9a54c29 | 688 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
70791e56 | 689 | packet_put_string(send_tok.value, send_tok.length); |
b9a54c29 | 690 | packet_send(); |
70791e56 | 691 | gss_release_buffer(&ms, &send_tok); |
b9a54c29 | 692 | } |
70791e56 | 693 | |
b9a54c29 | 694 | if (status == GSS_S_COMPLETE) { |
695 | /* If that succeeded, send a exchange complete message */ | |
696 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
697 | packet_send(); | |
b9a54c29 | 698 | } |
699 | } | |
700 | ||
88928908 | 701 | void |
702 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
703 | { | |
704 | Authctxt *authctxt = ctxt; | |
705 | Gssctxt *gssctxt; | |
70791e56 | 706 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
707 | gss_buffer_desc recv_tok; | |
708 | OM_uint32 status, ms; | |
709 | u_int len; | |
710 | ||
88928908 | 711 | if (authctxt == NULL) |
712 | fatal("input_gssapi_response: no authentication context"); | |
713 | gssctxt = authctxt->methoddata; | |
88928908 | 714 | |
70791e56 | 715 | recv_tok.value = packet_get_string(&len); |
716 | recv_tok.length = len; | |
88928908 | 717 | |
718 | packet_check_eom(); | |
70791e56 | 719 | |
720 | /* Stick it into GSSAPI and see what it says */ | |
721 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
722 | &recv_tok, &send_tok, NULL); | |
723 | ||
724 | xfree(recv_tok.value); | |
725 | gss_release_buffer(&ms, &send_tok); | |
726 | ||
727 | /* Server will be returning a failed packet after this one */ | |
88928908 | 728 | } |
729 | ||
730 | void | |
731 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
732 | { | |
70791e56 | 733 | OM_uint32 maj, min; |
88928908 | 734 | char *msg; |
735 | char *lang; | |
70791e56 | 736 | |
88928908 | 737 | maj=packet_get_int(); |
738 | min=packet_get_int(); | |
739 | msg=packet_get_string(NULL); | |
740 | lang=packet_get_string(NULL); | |
741 | ||
742 | packet_check_eom(); | |
70791e56 | 743 | |
744 | debug("Server GSSAPI Error:\n%s\n", msg); | |
88928908 | 745 | xfree(msg); |
746 | xfree(lang); | |
747 | } | |
748 | ||
b9a54c29 | 749 | int |
750 | userauth_external(Authctxt *authctxt) | |
751 | { | |
70791e56 | 752 | static int attempt = 0; |
b9a54c29 | 753 | |
754 | if (attempt++ >= 1) | |
755 | return 0; | |
756 | ||
70791e56 | 757 | /* The client MUST NOT try this method if initial key exchange |
758 | was not performed using a GSSAPI-based key exchange | |
759 | method. */ | |
760 | if (xxx_kex->kex_type != KEX_GSS_GRP1_SHA1) { | |
761 | debug2("gsskex not performed, skipping external-keyx"); | |
762 | return 0; | |
763 | } | |
764 | ||
b9a54c29 | 765 | debug2("userauth_external"); |
766 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
c2397a66 | 767 | #ifdef GSI |
2980ea68 | 768 | if(options.implicit && !(datafellows & SSH_BUG_GSS_EMPTYUSER)) { |
769 | packet_put_cstring(""); | |
770 | } else { | |
c2397a66 | 771 | #endif |
2980ea68 | 772 | packet_put_cstring(authctxt->server_user); |
c2397a66 | 773 | #ifdef GSI |
2980ea68 | 774 | } |
c2397a66 | 775 | #endif |
b9a54c29 | 776 | packet_put_cstring(authctxt->service); |
777 | packet_put_cstring(authctxt->method->name); | |
778 | packet_send(); | |
779 | packet_write_wait(); | |
780 | return 1; | |
781 | } | |
782 | #endif /* GSSAPI */ | |
783 | ||
3c0ef626 | 784 | int |
785 | userauth_none(Authctxt *authctxt) | |
786 | { | |
787 | /* initial userauth request */ | |
788 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
789 | packet_put_cstring(authctxt->server_user); | |
790 | packet_put_cstring(authctxt->service); | |
791 | packet_put_cstring(authctxt->method->name); | |
792 | packet_send(); | |
793 | return 1; | |
794 | } | |
795 | ||
796 | int | |
797 | userauth_passwd(Authctxt *authctxt) | |
798 | { | |
799 | static int attempt = 0; | |
2980ea68 | 800 | char prompt[150]; |
3c0ef626 | 801 | char *password; |
802 | ||
803 | if (attempt++ >= options.number_of_password_prompts) | |
804 | return 0; | |
805 | ||
e9a17296 | 806 | if (attempt != 1) |
3c0ef626 | 807 | error("Permission denied, please try again."); |
808 | ||
809 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", | |
810 | authctxt->server_user, authctxt->host); | |
811 | password = read_passphrase(prompt, 0); | |
812 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
813 | packet_put_cstring(authctxt->server_user); | |
814 | packet_put_cstring(authctxt->service); | |
815 | packet_put_cstring(authctxt->method->name); | |
816 | packet_put_char(0); | |
817 | packet_put_cstring(password); | |
818 | memset(password, 0, strlen(password)); | |
819 | xfree(password); | |
820 | packet_add_padding(64); | |
821 | packet_send(); | |
2980ea68 | 822 | |
ff2d7a98 | 823 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
2980ea68 | 824 | &input_userauth_passwd_changereq); |
825 | ||
3c0ef626 | 826 | return 1; |
827 | } | |
2980ea68 | 828 | /* |
829 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
830 | */ | |
831 | void | |
832 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) | |
833 | { | |
834 | Authctxt *authctxt = ctxt; | |
835 | char *info, *lang, *password = NULL, *retype = NULL; | |
836 | char prompt[150]; | |
837 | ||
838 | debug2("input_userauth_passwd_changereq"); | |
839 | ||
840 | if (authctxt == NULL) | |
841 | fatal("input_userauth_passwd_changereq: " | |
842 | "no authentication context"); | |
843 | ||
844 | info = packet_get_string(NULL); | |
845 | lang = packet_get_string(NULL); | |
846 | if (strlen(info) > 0) | |
70791e56 | 847 | logit("%s", info); |
2980ea68 | 848 | xfree(info); |
849 | xfree(lang); | |
850 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
851 | packet_put_cstring(authctxt->server_user); | |
852 | packet_put_cstring(authctxt->service); | |
853 | packet_put_cstring(authctxt->method->name); | |
854 | packet_put_char(1); /* additional info */ | |
ff2d7a98 | 855 | snprintf(prompt, sizeof(prompt), |
2980ea68 | 856 | "Enter %.30s@%.128s's old password: ", |
857 | authctxt->server_user, authctxt->host); | |
858 | password = read_passphrase(prompt, 0); | |
859 | packet_put_cstring(password); | |
860 | memset(password, 0, strlen(password)); | |
861 | xfree(password); | |
862 | password = NULL; | |
863 | while (password == NULL) { | |
ff2d7a98 | 864 | snprintf(prompt, sizeof(prompt), |
2980ea68 | 865 | "Enter %.30s@%.128s's new password: ", |
866 | authctxt->server_user, authctxt->host); | |
867 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
868 | if (password == NULL) { | |
869 | /* bail out */ | |
870 | return; | |
871 | } | |
ff2d7a98 | 872 | snprintf(prompt, sizeof(prompt), |
2980ea68 | 873 | "Retype %.30s@%.128s's new password: ", |
874 | authctxt->server_user, authctxt->host); | |
875 | retype = read_passphrase(prompt, 0); | |
876 | if (strcmp(password, retype) != 0) { | |
877 | memset(password, 0, strlen(password)); | |
878 | xfree(password); | |
70791e56 | 879 | logit("Mismatch; try again, EOF to quit."); |
2980ea68 | 880 | password = NULL; |
881 | } | |
882 | memset(retype, 0, strlen(retype)); | |
883 | xfree(retype); | |
884 | } | |
885 | packet_put_cstring(password); | |
886 | memset(password, 0, strlen(password)); | |
887 | xfree(password); | |
888 | packet_add_padding(64); | |
889 | packet_send(); | |
ff2d7a98 | 890 | |
891 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
2980ea68 | 892 | &input_userauth_passwd_changereq); |
893 | } | |
3c0ef626 | 894 | |
70791e56 | 895 | static int |
896 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
897 | u_char *data, u_int datalen) | |
3c0ef626 | 898 | { |
70791e56 | 899 | Key *prv; |
900 | int ret; | |
901 | ||
902 | /* the agent supports this key */ | |
903 | if (id->ac) | |
904 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
905 | data, datalen)); | |
906 | /* | |
907 | * we have already loaded the private key or | |
908 | * the private key is stored in external hardware | |
909 | */ | |
910 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
911 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
912 | /* load the private key from the file */ | |
913 | if ((prv = load_identity_file(id->filename)) == NULL) | |
914 | return (-1); | |
915 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
916 | key_free(prv); | |
917 | return (ret); | |
3c0ef626 | 918 | } |
919 | ||
920 | static int | |
70791e56 | 921 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
3c0ef626 | 922 | { |
923 | Buffer b; | |
924 | u_char *blob, *signature; | |
e9a17296 | 925 | u_int bloblen, slen; |
70791e56 | 926 | u_int skip = 0; |
3c0ef626 | 927 | int ret = -1; |
928 | int have_sig = 1; | |
929 | ||
930 | debug3("sign_and_send_pubkey"); | |
931 | ||
70791e56 | 932 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 933 | /* we cannot handle this key */ |
934 | debug3("sign_and_send_pubkey: cannot handle key"); | |
935 | return 0; | |
936 | } | |
937 | /* data to be signed */ | |
938 | buffer_init(&b); | |
939 | if (datafellows & SSH_OLD_SESSIONID) { | |
940 | buffer_append(&b, session_id2, session_id2_len); | |
941 | skip = session_id2_len; | |
942 | } else { | |
943 | buffer_put_string(&b, session_id2, session_id2_len); | |
944 | skip = buffer_len(&b); | |
945 | } | |
946 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
947 | buffer_put_cstring(&b, authctxt->server_user); | |
948 | buffer_put_cstring(&b, | |
949 | datafellows & SSH_BUG_PKSERVICE ? | |
950 | "ssh-userauth" : | |
951 | authctxt->service); | |
952 | if (datafellows & SSH_BUG_PKAUTH) { | |
953 | buffer_put_char(&b, have_sig); | |
954 | } else { | |
955 | buffer_put_cstring(&b, authctxt->method->name); | |
956 | buffer_put_char(&b, have_sig); | |
70791e56 | 957 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 958 | } |
959 | buffer_put_string(&b, blob, bloblen); | |
960 | ||
961 | /* generate signature */ | |
70791e56 | 962 | ret = identity_sign(id, &signature, &slen, |
3c0ef626 | 963 | buffer_ptr(&b), buffer_len(&b)); |
964 | if (ret == -1) { | |
965 | xfree(blob); | |
966 | buffer_free(&b); | |
967 | return 0; | |
968 | } | |
969 | #ifdef DEBUG_PK | |
970 | buffer_dump(&b); | |
971 | #endif | |
972 | if (datafellows & SSH_BUG_PKSERVICE) { | |
973 | buffer_clear(&b); | |
974 | buffer_append(&b, session_id2, session_id2_len); | |
975 | skip = session_id2_len; | |
976 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
977 | buffer_put_cstring(&b, authctxt->server_user); | |
978 | buffer_put_cstring(&b, authctxt->service); | |
979 | buffer_put_cstring(&b, authctxt->method->name); | |
980 | buffer_put_char(&b, have_sig); | |
981 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
70791e56 | 982 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 983 | buffer_put_string(&b, blob, bloblen); |
984 | } | |
985 | xfree(blob); | |
986 | ||
987 | /* append signature */ | |
988 | buffer_put_string(&b, signature, slen); | |
989 | xfree(signature); | |
990 | ||
991 | /* skip session id and packet type */ | |
992 | if (buffer_len(&b) < skip + 1) | |
993 | fatal("userauth_pubkey: internal error"); | |
994 | buffer_consume(&b, skip + 1); | |
995 | ||
996 | /* put remaining data from buffer into packet */ | |
997 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
998 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
999 | buffer_free(&b); | |
1000 | packet_send(); | |
1001 | ||
1002 | return 1; | |
1003 | } | |
1004 | ||
1005 | static int | |
70791e56 | 1006 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1007 | { |
1008 | u_char *blob; | |
e9a17296 | 1009 | u_int bloblen, have_sig = 0; |
3c0ef626 | 1010 | |
1011 | debug3("send_pubkey_test"); | |
1012 | ||
70791e56 | 1013 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1014 | /* we cannot handle this key */ |
1015 | debug3("send_pubkey_test: cannot handle key"); | |
1016 | return 0; | |
1017 | } | |
1018 | /* register callback for USERAUTH_PK_OK message */ | |
3c0ef626 | 1019 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
1020 | ||
1021 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1022 | packet_put_cstring(authctxt->server_user); | |
1023 | packet_put_cstring(authctxt->service); | |
1024 | packet_put_cstring(authctxt->method->name); | |
1025 | packet_put_char(have_sig); | |
1026 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
70791e56 | 1027 | packet_put_cstring(key_ssh_name(id->key)); |
3c0ef626 | 1028 | packet_put_string(blob, bloblen); |
1029 | xfree(blob); | |
1030 | packet_send(); | |
1031 | return 1; | |
1032 | } | |
1033 | ||
1034 | static Key * | |
1035 | load_identity_file(char *filename) | |
1036 | { | |
1037 | Key *private; | |
1038 | char prompt[300], *passphrase; | |
1039 | int quit, i; | |
1040 | struct stat st; | |
1041 | ||
1042 | if (stat(filename, &st) < 0) { | |
1043 | debug3("no such identity: %s", filename); | |
1044 | return NULL; | |
1045 | } | |
1046 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); | |
1047 | if (private == NULL) { | |
1048 | if (options.batch_mode) | |
1049 | return NULL; | |
1050 | snprintf(prompt, sizeof prompt, | |
e9a17296 | 1051 | "Enter passphrase for key '%.100s': ", filename); |
3c0ef626 | 1052 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1053 | passphrase = read_passphrase(prompt, 0); | |
1054 | if (strcmp(passphrase, "") != 0) { | |
1055 | private = key_load_private_type(KEY_UNSPEC, filename, | |
1056 | passphrase, NULL); | |
1057 | quit = 0; | |
1058 | } else { | |
1059 | debug2("no passphrase given, try next key"); | |
1060 | quit = 1; | |
1061 | } | |
1062 | memset(passphrase, 0, strlen(passphrase)); | |
1063 | xfree(passphrase); | |
1064 | if (private != NULL || quit) | |
1065 | break; | |
1066 | debug2("bad passphrase given, try again..."); | |
1067 | } | |
1068 | } | |
1069 | return private; | |
1070 | } | |
1071 | ||
70791e56 | 1072 | /* |
1073 | * try keys in the following order: | |
1074 | * 1. agent keys that are found in the config file | |
1075 | * 2. other agent keys | |
1076 | * 3. keys that are only listed in the config file | |
1077 | */ | |
1078 | static void | |
1079 | pubkey_prepare(Authctxt *authctxt) | |
3c0ef626 | 1080 | { |
70791e56 | 1081 | Identity *id; |
1082 | Idlist agent, files, *preferred; | |
1083 | Key *key; | |
1084 | AuthenticationConnection *ac; | |
1085 | char *comment; | |
1086 | int i, found; | |
1087 | ||
1088 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1089 | TAILQ_INIT(&files); /* keys from the config file */ | |
1090 | preferred = &authctxt->keys; | |
1091 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1092 | ||
1093 | /* list of keys stored in the filesystem */ | |
1094 | for (i = 0; i < options.num_identity_files; i++) { | |
1095 | key = options.identity_keys[i]; | |
1096 | if (key && key->type == KEY_RSA1) | |
1097 | continue; | |
1098 | options.identity_keys[i] = NULL; | |
1099 | id = xmalloc(sizeof(*id)); | |
1100 | memset(id, 0, sizeof(*id)); | |
1101 | id->key = key; | |
1102 | id->filename = xstrdup(options.identity_files[i]); | |
1103 | TAILQ_INSERT_TAIL(&files, id, next); | |
1104 | } | |
1105 | /* list of keys supported by the agent */ | |
1106 | if ((ac = ssh_get_authentication_connection())) { | |
1107 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1108 | key != NULL; | |
1109 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1110 | found = 0; | |
1111 | TAILQ_FOREACH(id, &files, next) { | |
1112 | /* agent keys from the config file are preferred */ | |
1113 | if (key_equal(key, id->key)) { | |
1114 | key_free(key); | |
1115 | xfree(comment); | |
1116 | TAILQ_REMOVE(&files, id, next); | |
1117 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1118 | id->ac = ac; | |
1119 | found = 1; | |
1120 | break; | |
1121 | } | |
1122 | } | |
1123 | if (!found) { | |
1124 | id = xmalloc(sizeof(*id)); | |
1125 | memset(id, 0, sizeof(*id)); | |
1126 | id->key = key; | |
1127 | id->filename = comment; | |
1128 | id->ac = ac; | |
1129 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1130 | } | |
1131 | } | |
1132 | /* append remaining agent keys */ | |
1133 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1134 | TAILQ_REMOVE(&agent, id, next); | |
1135 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1136 | } | |
1137 | authctxt->agent = ac; | |
1138 | } | |
1139 | /* append remaining keys from the config file */ | |
1140 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1141 | TAILQ_REMOVE(&files, id, next); | |
1142 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1143 | } | |
1144 | TAILQ_FOREACH(id, preferred, next) { | |
1145 | debug2("key: %s (%p)", id->filename, id->key); | |
1146 | } | |
3c0ef626 | 1147 | } |
1148 | ||
70791e56 | 1149 | static void |
1150 | pubkey_cleanup(Authctxt *authctxt) | |
3c0ef626 | 1151 | { |
70791e56 | 1152 | Identity *id; |
1153 | ||
1154 | if (authctxt->agent != NULL) | |
1155 | ssh_close_authentication_connection(authctxt->agent); | |
1156 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1157 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1158 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1159 | if (id->key) | |
1160 | key_free(id->key); | |
1161 | if (id->filename) | |
1162 | xfree(id->filename); | |
1163 | xfree(id); | |
3c0ef626 | 1164 | } |
3c0ef626 | 1165 | } |
1166 | ||
1167 | int | |
1168 | userauth_pubkey(Authctxt *authctxt) | |
1169 | { | |
70791e56 | 1170 | Identity *id; |
3c0ef626 | 1171 | int sent = 0; |
3c0ef626 | 1172 | |
70791e56 | 1173 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1174 | if (id->tried++) | |
1175 | return (0); | |
1176 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1177 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1178 | /* | |
1179 | * send a test message if we have the public key. for | |
1180 | * encrypted keys we cannot do this and have to load the | |
1181 | * private key instead | |
1182 | */ | |
1183 | if (id->key && id->key->type != KEY_RSA1) { | |
1184 | debug("Offering public key: %s", id->filename); | |
1185 | sent = send_pubkey_test(authctxt, id); | |
1186 | } else if (id->key == NULL) { | |
1187 | debug("Trying private key: %s", id->filename); | |
1188 | id->key = load_identity_file(id->filename); | |
1189 | if (id->key != NULL) { | |
1190 | id->isprivate = 1; | |
1191 | sent = sign_and_send_pubkey(authctxt, id); | |
1192 | key_free(id->key); | |
1193 | id->key = NULL; | |
3c0ef626 | 1194 | } |
3c0ef626 | 1195 | } |
70791e56 | 1196 | if (sent) |
1197 | return (sent); | |
3c0ef626 | 1198 | } |
70791e56 | 1199 | return (0); |
3c0ef626 | 1200 | } |
1201 | ||
1202 | /* | |
1203 | * Send userauth request message specifying keyboard-interactive method. | |
1204 | */ | |
1205 | int | |
1206 | userauth_kbdint(Authctxt *authctxt) | |
1207 | { | |
1208 | static int attempt = 0; | |
1209 | ||
1210 | if (attempt++ >= options.number_of_password_prompts) | |
1211 | return 0; | |
1212 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ | |
1213 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1214 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1215 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | debug2("userauth_kbdint"); | |
1220 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1221 | packet_put_cstring(authctxt->server_user); | |
1222 | packet_put_cstring(authctxt->service); | |
1223 | packet_put_cstring(authctxt->method->name); | |
1224 | packet_put_cstring(""); /* lang */ | |
1225 | packet_put_cstring(options.kbd_interactive_devices ? | |
1226 | options.kbd_interactive_devices : ""); | |
1227 | packet_send(); | |
1228 | ||
1229 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1230 | return 1; | |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE | |
1235 | */ | |
1236 | void | |
e9a17296 | 1237 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1238 | { |
1239 | Authctxt *authctxt = ctxt; | |
1240 | char *name, *inst, *lang, *prompt, *response; | |
1241 | u_int num_prompts, i; | |
1242 | int echo = 0; | |
1243 | ||
1244 | debug2("input_userauth_info_req"); | |
1245 | ||
1246 | if (authctxt == NULL) | |
1247 | fatal("input_userauth_info_req: no authentication context"); | |
1248 | ||
1249 | authctxt->info_req_seen = 1; | |
1250 | ||
1251 | name = packet_get_string(NULL); | |
1252 | inst = packet_get_string(NULL); | |
1253 | lang = packet_get_string(NULL); | |
1254 | if (strlen(name) > 0) | |
70791e56 | 1255 | logit("%s", name); |
3c0ef626 | 1256 | if (strlen(inst) > 0) |
70791e56 | 1257 | logit("%s", inst); |
3c0ef626 | 1258 | xfree(name); |
1259 | xfree(inst); | |
1260 | xfree(lang); | |
1261 | ||
1262 | num_prompts = packet_get_int(); | |
1263 | /* | |
1264 | * Begin to build info response packet based on prompts requested. | |
1265 | * We commit to providing the correct number of responses, so if | |
1266 | * further on we run into a problem that prevents this, we have to | |
1267 | * be sure and clean this up and send a correct error response. | |
1268 | */ | |
1269 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1270 | packet_put_int(num_prompts); | |
1271 | ||
1272 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); | |
1273 | for (i = 0; i < num_prompts; i++) { | |
1274 | prompt = packet_get_string(NULL); | |
1275 | echo = packet_get_char(); | |
1276 | ||
1277 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); | |
1278 | ||
1279 | packet_put_cstring(response); | |
1280 | memset(response, 0, strlen(response)); | |
1281 | xfree(response); | |
1282 | xfree(prompt); | |
1283 | } | |
e9a17296 | 1284 | packet_check_eom(); /* done with parsing incoming message. */ |
3c0ef626 | 1285 | |
1286 | packet_add_padding(64); | |
1287 | packet_send(); | |
1288 | } | |
1289 | ||
ff2d7a98 | 1290 | static int |
1291 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, | |
1292 | u_char *data, u_int datalen) | |
1293 | { | |
1294 | Buffer b; | |
1295 | struct stat st; | |
1296 | pid_t pid; | |
1297 | int to[2], from[2], status, version = 2; | |
1298 | ||
1c14df9e | 1299 | debug2("ssh_keysign called"); |
ff2d7a98 | 1300 | |
1301 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { | |
1302 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1303 | return -1; | |
1304 | } | |
1305 | if (fflush(stdout) != 0) | |
1306 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1307 | if (pipe(to) < 0) { | |
1308 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1309 | return -1; | |
1310 | } | |
1311 | if (pipe(from) < 0) { | |
1312 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1313 | return -1; | |
1314 | } | |
1315 | if ((pid = fork()) < 0) { | |
1316 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1317 | return -1; | |
1318 | } | |
1319 | if (pid == 0) { | |
1320 | seteuid(getuid()); | |
1321 | setuid(getuid()); | |
1322 | close(from[0]); | |
1323 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1324 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1325 | close(to[1]); | |
1326 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1327 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1328 | close(from[1]); | |
1329 | close(to[0]); | |
1330 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); | |
1331 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, | |
1332 | strerror(errno)); | |
1333 | } | |
1334 | close(from[1]); | |
1335 | close(to[0]); | |
1336 | ||
1337 | buffer_init(&b); | |
1338 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ | |
1339 | buffer_put_string(&b, data, datalen); | |
e54b3d7c | 1340 | ssh_msg_send(to[1], version, &b); |
ff2d7a98 | 1341 | |
e54b3d7c | 1342 | if (ssh_msg_recv(from[0], &b) < 0) { |
ff2d7a98 | 1343 | error("ssh_keysign: no reply"); |
1344 | buffer_clear(&b); | |
1345 | return -1; | |
1346 | } | |
1347 | close(from[0]); | |
1348 | close(to[1]); | |
1349 | ||
1350 | while (waitpid(pid, &status, 0) < 0) | |
1351 | if (errno != EINTR) | |
1352 | break; | |
1353 | ||
1354 | if (buffer_get_char(&b) != version) { | |
1355 | error("ssh_keysign: bad version"); | |
1356 | buffer_clear(&b); | |
1357 | return -1; | |
1358 | } | |
1359 | *sigp = buffer_get_string(&b, lenp); | |
1360 | buffer_clear(&b); | |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
3c0ef626 | 1365 | int |
1366 | userauth_hostbased(Authctxt *authctxt) | |
1367 | { | |
1368 | Key *private = NULL; | |
ff2d7a98 | 1369 | Sensitive *sensitive = authctxt->sensitive; |
3c0ef626 | 1370 | Buffer b; |
1371 | u_char *signature, *blob; | |
1372 | char *chost, *pkalg, *p; | |
1373 | const char *service; | |
1374 | u_int blen, slen; | |
1375 | int ok, i, len, found = 0; | |
1376 | ||
1377 | /* check for a useful key */ | |
ff2d7a98 | 1378 | for (i = 0; i < sensitive->nkeys; i++) { |
1379 | private = sensitive->keys[i]; | |
3c0ef626 | 1380 | if (private && private->type != KEY_RSA1) { |
1381 | found = 1; | |
1382 | /* we take and free the key */ | |
ff2d7a98 | 1383 | sensitive->keys[i] = NULL; |
3c0ef626 | 1384 | break; |
1385 | } | |
1386 | } | |
1387 | if (!found) { | |
1c14df9e | 1388 | debug("No more client hostkeys for hostbased authentication."); |
3c0ef626 | 1389 | return 0; |
1390 | } | |
1391 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1392 | key_free(private); | |
1393 | return 0; | |
1394 | } | |
1395 | /* figure out a name for the client host */ | |
1396 | p = get_local_name(packet_get_connection_in()); | |
1397 | if (p == NULL) { | |
1398 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1399 | key_free(private); | |
1400 | return 0; | |
1401 | } | |
1402 | len = strlen(p) + 2; | |
1403 | chost = xmalloc(len); | |
1404 | strlcpy(chost, p, len); | |
1405 | strlcat(chost, ".", len); | |
1406 | debug2("userauth_hostbased: chost %s", chost); | |
1c14df9e | 1407 | xfree(p); |
3c0ef626 | 1408 | |
1409 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : | |
1410 | authctxt->service; | |
1411 | pkalg = xstrdup(key_ssh_name(private)); | |
1412 | buffer_init(&b); | |
1413 | /* construct data */ | |
1414 | buffer_put_string(&b, session_id2, session_id2_len); | |
1415 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1416 | buffer_put_cstring(&b, authctxt->server_user); | |
1417 | buffer_put_cstring(&b, service); | |
1418 | buffer_put_cstring(&b, authctxt->method->name); | |
1419 | buffer_put_cstring(&b, pkalg); | |
1420 | buffer_put_string(&b, blob, blen); | |
1421 | buffer_put_cstring(&b, chost); | |
1422 | buffer_put_cstring(&b, authctxt->local_user); | |
1423 | #ifdef DEBUG_PK | |
1424 | buffer_dump(&b); | |
1425 | #endif | |
ff2d7a98 | 1426 | if (sensitive->external_keysign) |
1427 | ok = ssh_keysign(private, &signature, &slen, | |
1428 | buffer_ptr(&b), buffer_len(&b)); | |
1429 | else | |
1430 | ok = key_sign(private, &signature, &slen, | |
1431 | buffer_ptr(&b), buffer_len(&b)); | |
3c0ef626 | 1432 | key_free(private); |
1433 | buffer_free(&b); | |
1434 | if (ok != 0) { | |
1435 | error("key_sign failed"); | |
1436 | xfree(chost); | |
1437 | xfree(pkalg); | |
1438 | return 0; | |
1439 | } | |
1440 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1441 | packet_put_cstring(authctxt->server_user); | |
1442 | packet_put_cstring(authctxt->service); | |
1443 | packet_put_cstring(authctxt->method->name); | |
1444 | packet_put_cstring(pkalg); | |
1445 | packet_put_string(blob, blen); | |
1446 | packet_put_cstring(chost); | |
1447 | packet_put_cstring(authctxt->local_user); | |
1448 | packet_put_string(signature, slen); | |
1449 | memset(signature, 's', slen); | |
1450 | xfree(signature); | |
1451 | xfree(chost); | |
1452 | xfree(pkalg); | |
1453 | ||
1454 | packet_send(); | |
1455 | return 1; | |
1456 | } | |
1457 | ||
1458 | /* find auth method */ | |
1459 | ||
1460 | /* | |
1461 | * given auth method name, if configurable options permit this method fill | |
1462 | * in auth_ident field and return true, otherwise return false. | |
1463 | */ | |
1464 | static int | |
1465 | authmethod_is_enabled(Authmethod *method) | |
1466 | { | |
1467 | if (method == NULL) | |
1468 | return 0; | |
1469 | /* return false if options indicate this method is disabled */ | |
1470 | if (method->enabled == NULL || *method->enabled == 0) | |
1471 | return 0; | |
1472 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1473 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1474 | return 0; | |
1475 | return 1; | |
1476 | } | |
1477 | ||
1478 | static Authmethod * | |
1479 | authmethod_lookup(const char *name) | |
1480 | { | |
1481 | Authmethod *method = NULL; | |
1482 | if (name != NULL) | |
1483 | for (method = authmethods; method->name != NULL; method++) | |
1484 | if (strcmp(name, method->name) == 0) | |
1485 | return method; | |
1486 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1487 | return NULL; | |
1488 | } | |
1489 | ||
1490 | /* XXX internal state */ | |
1491 | static Authmethod *current = NULL; | |
1492 | static char *supported = NULL; | |
1493 | static char *preferred = NULL; | |
ff2d7a98 | 1494 | |
3c0ef626 | 1495 | /* |
1496 | * Given the authentication method list sent by the server, return the | |
1497 | * next method we should try. If the server initially sends a nil list, | |
1498 | * use a built-in default list. | |
1499 | */ | |
1500 | static Authmethod * | |
1501 | authmethod_get(char *authlist) | |
1502 | { | |
3c0ef626 | 1503 | char *name = NULL; |
e9a17296 | 1504 | u_int next; |
3c0ef626 | 1505 | |
1506 | /* Use a suitable default if we're passed a nil list. */ | |
1507 | if (authlist == NULL || strlen(authlist) == 0) | |
1508 | authlist = options.preferred_authentications; | |
1509 | ||
1510 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1511 | debug3("start over, passed a different list %s", authlist); | |
1512 | if (supported != NULL) | |
1513 | xfree(supported); | |
1514 | supported = xstrdup(authlist); | |
1515 | preferred = options.preferred_authentications; | |
1516 | debug3("preferred %s", preferred); | |
1517 | current = NULL; | |
1518 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1519 | return current; | |
1520 | ||
1521 | for (;;) { | |
1522 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
1c14df9e | 1523 | debug("No more authentication methods to try."); |
3c0ef626 | 1524 | current = NULL; |
1525 | return NULL; | |
1526 | } | |
1527 | preferred += next; | |
1528 | debug3("authmethod_lookup %s", name); | |
1529 | debug3("remaining preferred: %s", preferred); | |
1530 | if ((current = authmethod_lookup(name)) != NULL && | |
1531 | authmethod_is_enabled(current)) { | |
1532 | debug3("authmethod_is_enabled %s", name); | |
1c14df9e | 1533 | debug("Next authentication method: %s", name); |
3c0ef626 | 1534 | return current; |
1535 | } | |
1536 | } | |
1537 | } | |
1538 | ||
3c0ef626 | 1539 | static char * |
1540 | authmethods_get(void) | |
1541 | { | |
1542 | Authmethod *method = NULL; | |
e9a17296 | 1543 | Buffer b; |
1544 | char *list; | |
3c0ef626 | 1545 | |
e9a17296 | 1546 | buffer_init(&b); |
3c0ef626 | 1547 | for (method = authmethods; method->name != NULL; method++) { |
1548 | if (authmethod_is_enabled(method)) { | |
e9a17296 | 1549 | if (buffer_len(&b) > 0) |
1550 | buffer_append(&b, ",", 1); | |
1551 | buffer_append(&b, method->name, strlen(method->name)); | |
3c0ef626 | 1552 | } |
1553 | } | |
e9a17296 | 1554 | buffer_append(&b, "\0", 1); |
1555 | list = xstrdup(buffer_ptr(&b)); | |
1556 | buffer_free(&b); | |
1557 | return list; | |
3c0ef626 | 1558 | } |