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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" | |
7cac2b65 | 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" | |
44a053a3 | 50 | #include "msg.h" |
51 | #include "pathnames.h" | |
3c0ef626 | 52 | |
5598e598 | 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; | |
7cac2b65 | 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; | |
1e608e42 | 86 | #ifdef GSSAPI |
87 | char *orig, *gss; | |
88 | int len; | |
89 | #endif | |
3c0ef626 | 90 | |
91 | xxx_host = host; | |
92 | xxx_hostaddr = hostaddr; | |
93 | ||
5598e598 | 94 | #ifdef GSSAPI |
7a056ed1 | 95 | if (options.gss_keyex) { |
1e608e42 | 96 | /* Add the GSSAPI mechanisms currently supported on this client to |
97 | * the key exchange algorithm proposal */ | |
98 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
2ae11cdc | 99 | gss = ssh_gssapi_client_mechanisms((char *)get_canonical_hostname(1)); |
1e608e42 | 100 | if (gss) { |
101 | len = strlen(orig)+strlen(gss)+2; | |
102 | myproposal[PROPOSAL_KEX_ALGS]=xmalloc(len); | |
103 | snprintf(myproposal[PROPOSAL_KEX_ALGS],len,"%s,%s",gss,orig); | |
5598e598 | 104 | } |
7a056ed1 | 105 | } |
5598e598 | 106 | #endif |
107 | ||
3c0ef626 | 108 | if (options.ciphers == (char *)-1) { |
7cac2b65 | 109 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
3c0ef626 | 110 | options.ciphers = NULL; |
111 | } | |
112 | if (options.ciphers != NULL) { | |
113 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
114 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
115 | } | |
116 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
117 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
118 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
119 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
120 | if (options.compression) { | |
121 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
d03f4262 | 122 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none"; |
3c0ef626 | 123 | } else { |
124 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
d03f4262 | 125 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib"; |
3c0ef626 | 126 | } |
127 | if (options.macs != NULL) { | |
128 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
129 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
130 | } | |
131 | if (options.hostkeyalgorithms != NULL) | |
1e608e42 | 132 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
3c0ef626 | 133 | options.hostkeyalgorithms; |
134 | ||
1e608e42 | 135 | #ifdef GSSAPI |
136 | /* If we've got GSSAPI algorithms, then we also support the | |
137 | * 'null' hostkey, as a last resort */ | |
7a056ed1 | 138 | if (options.gss_keyex && gss) { |
23987cb8 | 139 | orig=myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]; |
140 | len = strlen(orig)+sizeof(",null"); | |
141 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]=xmalloc(len); | |
142 | snprintf(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],len,"%s,null",orig); | |
1e608e42 | 143 | } |
144 | #endif | |
7cac2b65 | 145 | |
146 | if (options.rekey_limit) | |
147 | packet_set_rekey_limit(options.rekey_limit); | |
148 | ||
3c0ef626 | 149 | /* start key exchange */ |
150 | kex = kex_setup(myproposal); | |
bfe49944 | 151 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
152 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
153 | #ifdef GSSAPI | |
154 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client; | |
155 | #endif | |
3c0ef626 | 156 | kex->client_version_string=client_version_string; |
157 | kex->server_version_string=server_version_string; | |
158 | kex->verify_host_key=&verify_host_key_callback; | |
5598e598 | 159 | #ifdef GSSAPI |
160 | kex->options.gss_deleg_creds=options.gss_deleg_creds; | |
161 | #endif | |
7cac2b65 | 162 | |
3c0ef626 | 163 | xxx_kex = kex; |
164 | ||
165 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
166 | ||
167 | session_id2 = kex->session_id; | |
168 | session_id2_len = kex->session_id_len; | |
169 | ||
170 | #ifdef DEBUG_KEXDH | |
171 | /* send 1st encrypted/maced/compressed message */ | |
172 | packet_start(SSH2_MSG_IGNORE); | |
173 | packet_put_cstring("markus"); | |
174 | packet_send(); | |
175 | packet_write_wait(); | |
176 | #endif | |
3c0ef626 | 177 | } |
178 | ||
179 | /* | |
180 | * Authenticate user | |
181 | */ | |
182 | ||
183 | typedef struct Authctxt Authctxt; | |
184 | typedef struct Authmethod Authmethod; | |
7cac2b65 | 185 | typedef struct identity Identity; |
186 | typedef struct idlist Idlist; | |
187 | ||
188 | struct identity { | |
189 | TAILQ_ENTRY(identity) next; | |
190 | AuthenticationConnection *ac; /* set if agent supports key */ | |
191 | Key *key; /* public/private key */ | |
192 | char *filename; /* comment for agent-only keys */ | |
193 | int tried; | |
194 | int isprivate; /* key points to the private key */ | |
195 | }; | |
196 | TAILQ_HEAD(idlist, identity); | |
3c0ef626 | 197 | |
198 | struct Authctxt { | |
199 | const char *server_user; | |
200 | const char *local_user; | |
201 | const char *host; | |
202 | const char *service; | |
203 | Authmethod *method; | |
204 | int success; | |
205 | char *authlist; | |
206 | /* pubkey */ | |
7cac2b65 | 207 | Idlist keys; |
3c0ef626 | 208 | AuthenticationConnection *agent; |
209 | /* hostbased */ | |
44a053a3 | 210 | Sensitive *sensitive; |
3c0ef626 | 211 | /* kbd-interactive */ |
212 | int info_req_seen; | |
5598e598 | 213 | /* generic */ |
214 | void *methoddata; | |
3c0ef626 | 215 | }; |
216 | struct Authmethod { | |
217 | char *name; /* string to compare against server's list */ | |
218 | int (*userauth)(Authctxt *authctxt); | |
219 | int *enabled; /* flag in option struct that enables method */ | |
220 | int *batch_flag; /* flag in option struct that disables method */ | |
221 | }; | |
222 | ||
1e608e42 | 223 | void input_userauth_success(int, u_int32_t, void *); |
224 | void input_userauth_failure(int, u_int32_t, void *); | |
225 | void input_userauth_banner(int, u_int32_t, void *); | |
226 | void input_userauth_error(int, u_int32_t, void *); | |
227 | void input_userauth_info_req(int, u_int32_t, void *); | |
228 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
510132b6 | 229 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
3c0ef626 | 230 | |
1e608e42 | 231 | int userauth_none(Authctxt *); |
232 | int userauth_pubkey(Authctxt *); | |
233 | int userauth_passwd(Authctxt *); | |
234 | int userauth_kbdint(Authctxt *); | |
235 | int userauth_hostbased(Authctxt *); | |
7cac2b65 | 236 | int userauth_kerberos(Authctxt *); |
237 | ||
238 | #ifdef GSSAPI | |
239 | int userauth_gssapi(Authctxt *authctxt); | |
240 | void input_gssapi_response(int type, u_int32_t, void *); | |
241 | void input_gssapi_token(int type, u_int32_t, void *); | |
242 | void input_gssapi_hash(int type, u_int32_t, void *); | |
243 | void input_gssapi_error(int, u_int32_t, void *); | |
244 | void input_gssapi_errtok(int, u_int32_t, void *); | |
245 | #endif | |
3c0ef626 | 246 | |
5598e598 | 247 | #ifdef GSSAPI |
1e608e42 | 248 | int userauth_external(Authctxt *authctxt); |
249 | int userauth_gssapi(Authctxt *authctxt); | |
e23e524c | 250 | void input_gssapi_response(int type, u_int32_t, void *); |
251 | void input_gssapi_token(int type, u_int32_t, void *); | |
252 | void input_gssapi_hash(int type, u_int32_t, void *); | |
23987cb8 | 253 | void input_gssapi_error(int, u_int32_t, void *); |
e23e524c | 254 | void input_gssapi_errtok(int, u_int32_t, void *); |
5598e598 | 255 | #endif |
256 | ||
1e608e42 | 257 | void userauth(Authctxt *, char *); |
3c0ef626 | 258 | |
7cac2b65 | 259 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
260 | static void pubkey_prepare(Authctxt *); | |
261 | static void pubkey_cleanup(Authctxt *); | |
262 | static Key *load_identity_file(char *); | |
3c0ef626 | 263 | |
264 | static Authmethod *authmethod_get(char *authlist); | |
265 | static Authmethod *authmethod_lookup(const char *name); | |
266 | static char *authmethods_get(void); | |
267 | ||
268 | Authmethod authmethods[] = { | |
5598e598 | 269 | #ifdef GSSAPI |
270 | {"external-keyx", | |
271 | userauth_external, | |
272 | &options.gss_authentication, | |
273 | NULL}, | |
274 | {"gssapi", | |
275 | userauth_gssapi, | |
276 | &options.gss_authentication, | |
277 | NULL}, | |
278 | #endif | |
3c0ef626 | 279 | {"hostbased", |
280 | userauth_hostbased, | |
281 | &options.hostbased_authentication, | |
282 | NULL}, | |
283 | {"publickey", | |
284 | userauth_pubkey, | |
285 | &options.pubkey_authentication, | |
286 | NULL}, | |
287 | {"keyboard-interactive", | |
288 | userauth_kbdint, | |
289 | &options.kbd_interactive_authentication, | |
290 | &options.batch_mode}, | |
291 | {"password", | |
292 | userauth_passwd, | |
293 | &options.password_authentication, | |
294 | &options.batch_mode}, | |
295 | {"none", | |
296 | userauth_none, | |
297 | NULL, | |
298 | NULL}, | |
299 | {NULL, NULL, NULL, NULL} | |
300 | }; | |
301 | ||
302 | void | |
303 | ssh_userauth2(const char *local_user, const char *server_user, char *host, | |
44a053a3 | 304 | Sensitive *sensitive) |
3c0ef626 | 305 | { |
306 | Authctxt authctxt; | |
307 | int type; | |
3c0ef626 | 308 | |
309 | if (options.challenge_response_authentication) | |
310 | options.kbd_interactive_authentication = 1; | |
311 | ||
3c0ef626 | 312 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
313 | packet_put_cstring("ssh-userauth"); | |
314 | packet_send(); | |
bfe49944 | 315 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
3c0ef626 | 316 | packet_write_wait(); |
1e608e42 | 317 | type = packet_read(); |
bfe49944 | 318 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
319 | fatal("Server denied authentication request: %d", type); | |
3c0ef626 | 320 | if (packet_remaining() > 0) { |
1e608e42 | 321 | char *reply = packet_get_string(NULL); |
bfe49944 | 322 | debug2("service_accept: %s", reply); |
3c0ef626 | 323 | xfree(reply); |
324 | } else { | |
bfe49944 | 325 | debug2("buggy server: service_accept w/o service"); |
3c0ef626 | 326 | } |
1e608e42 | 327 | packet_check_eom(); |
bfe49944 | 328 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
3c0ef626 | 329 | |
330 | if (options.preferred_authentications == NULL) | |
331 | options.preferred_authentications = authmethods_get(); | |
332 | ||
333 | /* setup authentication context */ | |
334 | memset(&authctxt, 0, sizeof(authctxt)); | |
7cac2b65 | 335 | pubkey_prepare(&authctxt); |
3c0ef626 | 336 | authctxt.server_user = server_user; |
337 | authctxt.local_user = local_user; | |
338 | authctxt.host = host; | |
339 | authctxt.service = "ssh-connection"; /* service name */ | |
340 | authctxt.success = 0; | |
341 | authctxt.method = authmethod_lookup("none"); | |
342 | authctxt.authlist = NULL; | |
5598e598 | 343 | authctxt.methoddata = NULL; |
44a053a3 | 344 | authctxt.sensitive = sensitive; |
3c0ef626 | 345 | authctxt.info_req_seen = 0; |
346 | if (authctxt.method == NULL) | |
347 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
348 | ||
349 | /* initial userauth request */ | |
350 | userauth_none(&authctxt); | |
351 | ||
352 | dispatch_init(&input_userauth_error); | |
353 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
354 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
355 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); | |
356 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
357 | ||
7cac2b65 | 358 | pubkey_cleanup(&authctxt); |
359 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); | |
3c0ef626 | 360 | |
bfe49944 | 361 | debug("Authentication succeeded (%s).", authctxt.method->name); |
3c0ef626 | 362 | } |
7cac2b65 | 363 | |
3c0ef626 | 364 | void |
365 | userauth(Authctxt *authctxt, char *authlist) | |
366 | { | |
7cac2b65 | 367 | if (authctxt->methoddata) { |
5598e598 | 368 | xfree(authctxt->methoddata); |
7cac2b65 | 369 | authctxt->methoddata = NULL; |
5598e598 | 370 | } |
3c0ef626 | 371 | if (authlist == NULL) { |
372 | authlist = authctxt->authlist; | |
373 | } else { | |
374 | if (authctxt->authlist) | |
375 | xfree(authctxt->authlist); | |
376 | authctxt->authlist = authlist; | |
377 | } | |
378 | for (;;) { | |
379 | Authmethod *method = authmethod_get(authlist); | |
380 | if (method == NULL) | |
381 | fatal("Permission denied (%s).", authlist); | |
382 | authctxt->method = method; | |
7cac2b65 | 383 | |
384 | /* reset the per method handler */ | |
385 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
386 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
387 | ||
388 | /* and try new method */ | |
3c0ef626 | 389 | if (method->userauth(authctxt) != 0) { |
390 | debug2("we sent a %s packet, wait for reply", method->name); | |
391 | break; | |
392 | } else { | |
393 | debug2("we did not send a packet, disable method"); | |
394 | method->enabled = NULL; | |
395 | } | |
396 | } | |
397 | } | |
276b07a3 | 398 | |
3c0ef626 | 399 | void |
1e608e42 | 400 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 401 | { |
402 | fatal("input_userauth_error: bad message during authentication: " | |
403 | "type %d", type); | |
404 | } | |
276b07a3 | 405 | |
3c0ef626 | 406 | void |
1e608e42 | 407 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 408 | { |
409 | char *msg, *lang; | |
410 | debug3("input_userauth_banner"); | |
411 | msg = packet_get_string(NULL); | |
412 | lang = packet_get_string(NULL); | |
7cac2b65 | 413 | logit("%s", msg); |
3c0ef626 | 414 | xfree(msg); |
415 | xfree(lang); | |
416 | } | |
276b07a3 | 417 | |
3c0ef626 | 418 | void |
1e608e42 | 419 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 420 | { |
421 | Authctxt *authctxt = ctxt; | |
422 | if (authctxt == NULL) | |
423 | fatal("input_userauth_success: no authentication context"); | |
424 | if (authctxt->authlist) | |
425 | xfree(authctxt->authlist); | |
5598e598 | 426 | if (authctxt->methoddata) |
427 | xfree(authctxt->methoddata); | |
3c0ef626 | 428 | authctxt->success = 1; /* break out */ |
429 | } | |
276b07a3 | 430 | |
3c0ef626 | 431 | void |
1e608e42 | 432 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 433 | { |
434 | Authctxt *authctxt = ctxt; | |
435 | char *authlist = NULL; | |
436 | int partial; | |
437 | ||
438 | if (authctxt == NULL) | |
439 | fatal("input_userauth_failure: no authentication context"); | |
440 | ||
441 | authlist = packet_get_string(NULL); | |
442 | partial = packet_get_char(); | |
1e608e42 | 443 | packet_check_eom(); |
3c0ef626 | 444 | |
445 | if (partial != 0) | |
7cac2b65 | 446 | logit("Authenticated with partial success."); |
bfe49944 | 447 | debug("Authentications that can continue: %s", authlist); |
3c0ef626 | 448 | |
3c0ef626 | 449 | userauth(authctxt, authlist); |
450 | } | |
451 | void | |
1e608e42 | 452 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 453 | { |
454 | Authctxt *authctxt = ctxt; | |
455 | Key *key = NULL; | |
7cac2b65 | 456 | Identity *id = NULL; |
3c0ef626 | 457 | Buffer b; |
1e608e42 | 458 | int pktype, sent = 0; |
459 | u_int alen, blen; | |
460 | char *pkalg, *fp; | |
461 | u_char *pkblob; | |
3c0ef626 | 462 | |
463 | if (authctxt == NULL) | |
464 | fatal("input_userauth_pk_ok: no authentication context"); | |
465 | if (datafellows & SSH_BUG_PKOK) { | |
466 | /* this is similar to SSH_BUG_PKAUTH */ | |
467 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
468 | pkblob = packet_get_string(&blen); | |
469 | buffer_init(&b); | |
470 | buffer_append(&b, pkblob, blen); | |
471 | pkalg = buffer_get_string(&b, &alen); | |
472 | buffer_free(&b); | |
473 | } else { | |
474 | pkalg = packet_get_string(&alen); | |
475 | pkblob = packet_get_string(&blen); | |
476 | } | |
1e608e42 | 477 | packet_check_eom(); |
3c0ef626 | 478 | |
7cac2b65 | 479 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
3c0ef626 | 480 | |
7cac2b65 | 481 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
482 | debug("unknown pkalg %s", pkalg); | |
483 | goto done; | |
484 | } | |
485 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
486 | debug("no key from blob. pkalg %s", pkalg); | |
487 | goto done; | |
488 | } | |
489 | if (key->type != pktype) { | |
490 | error("input_userauth_pk_ok: type mismatch " | |
491 | "for decoded key (received %d, expected %d)", | |
492 | key->type, pktype); | |
493 | goto done; | |
494 | } | |
495 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
496 | debug2("input_userauth_pk_ok: fp %s", fp); | |
497 | xfree(fp); | |
498 | ||
499 | TAILQ_FOREACH(id, &authctxt->keys, next) { | |
500 | if (key_equal(key, id->key)) { | |
501 | sent = sign_and_send_pubkey(authctxt, id); | |
3c0ef626 | 502 | break; |
503 | } | |
7cac2b65 | 504 | } |
505 | done: | |
3c0ef626 | 506 | if (key != NULL) |
507 | key_free(key); | |
508 | xfree(pkalg); | |
509 | xfree(pkblob); | |
510 | ||
d03f4262 | 511 | /* try another method if we did not send a packet */ |
3c0ef626 | 512 | if (sent == 0) |
513 | userauth(authctxt, NULL); | |
3c0ef626 | 514 | } |
515 | ||
5598e598 | 516 | #ifdef GSSAPI |
517 | int | |
518 | userauth_gssapi(Authctxt *authctxt) | |
519 | { | |
23987cb8 | 520 | Gssctxt *gssctxt = NULL; |
521 | static gss_OID_set supported = NULL; | |
7cac2b65 | 522 | static int mech = 0; |
23987cb8 | 523 | OM_uint32 min; |
7cac2b65 | 524 | int ok = 0; |
23987cb8 | 525 | |
35094e47 | 526 | if (!options.gss_authentication) { |
527 | verbose("GSSAPI authentication disabled."); | |
528 | return 0; | |
529 | } | |
530 | ||
7cac2b65 | 531 | /* Try one GSSAPI method at a time, rather than sending them all at |
532 | * once. */ | |
5598e598 | 533 | |
7cac2b65 | 534 | if (supported == NULL) |
535 | gss_indicate_mechs(&min, &supported); | |
b59afbfe | 536 | |
7cac2b65 | 537 | /* Check to see if the mechanism is usable before we offer it */ |
23987cb8 | 538 | while (mech<supported->count && !ok) { |
7cac2b65 | 539 | if (gssctxt) |
540 | ssh_gssapi_delete_ctx(&gssctxt); | |
23987cb8 | 541 | ssh_gssapi_build_ctx(&gssctxt); |
7cac2b65 | 542 | ssh_gssapi_set_oid(gssctxt, &supported->elements[mech]); |
23987cb8 | 543 | |
7cac2b65 | 544 | /* My DER encoding requires length<128 */ |
545 | if (supported->elements[mech].length < 128 && | |
23987cb8 | 546 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
7cac2b65 | 547 | authctxt->host))) { |
548 | ok = 1; /* Mechanism works */ | |
23987cb8 | 549 | } else { |
550 | mech++; | |
551 | } | |
5598e598 | 552 | } |
7cac2b65 | 553 | |
23987cb8 | 554 | if (!ok) return 0; |
7cac2b65 | 555 | |
5598e598 | 556 | authctxt->methoddata=(void *)gssctxt; |
7cac2b65 | 557 | |
5598e598 | 558 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
23987cb8 | 559 | packet_put_cstring(authctxt->server_user); |
5598e598 | 560 | packet_put_cstring(authctxt->service); |
7cac2b65 | 561 | packet_put_cstring(authctxt->method->name); |
562 | ||
23987cb8 | 563 | packet_put_int(1); |
5598e598 | 564 | |
7cac2b65 | 565 | /* Some servers encode the OID incorrectly (as we used to) */ |
23987cb8 | 566 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
567 | packet_put_string(supported->elements[mech].elements, | |
7cac2b65 | 568 | supported->elements[mech].length); |
23987cb8 | 569 | } else { |
570 | packet_put_int((supported->elements[mech].length)+2); | |
7cac2b65 | 571 | packet_put_char(SSH_GSS_OIDTYPE); |
23987cb8 | 572 | packet_put_char(supported->elements[mech].length); |
573 | packet_put_raw(supported->elements[mech].elements, | |
7cac2b65 | 574 | supported->elements[mech].length); |
23987cb8 | 575 | } |
91a31bec | 576 | |
7cac2b65 | 577 | packet_send(); |
578 | ||
579 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
580 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
581 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
582 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
5598e598 | 583 | |
23987cb8 | 584 | mech++; /* Move along to next candidate */ |
91a31bec | 585 | |
7cac2b65 | 586 | return 1; |
5598e598 | 587 | } |
588 | ||
589 | void | |
7cac2b65 | 590 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
5598e598 | 591 | { |
592 | Authctxt *authctxt = ctxt; | |
593 | Gssctxt *gssctxt; | |
7cac2b65 | 594 | OM_uint32 status, ms; |
5598e598 | 595 | int oidlen; |
596 | char *oidv; | |
7cac2b65 | 597 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
598 | ||
5598e598 | 599 | if (authctxt == NULL) |
600 | fatal("input_gssapi_response: no authentication context"); | |
601 | gssctxt = authctxt->methoddata; | |
7cac2b65 | 602 | |
5598e598 | 603 | /* Setup our OID */ |
7cac2b65 | 604 | oidv = packet_get_string(&oidlen); |
605 | ||
23987cb8 | 606 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
7cac2b65 | 607 | if (!ssh_gssapi_check_oid(gssctxt, oidv, oidlen)) |
23987cb8 | 608 | fatal("Server returned different OID than expected"); |
23987cb8 | 609 | } else { |
7cac2b65 | 610 | if(oidv[0] != SSH_GSS_OIDTYPE || oidv[1] != oidlen-2) { |
23987cb8 | 611 | debug("Badly encoded mechanism OID received"); |
7cac2b65 | 612 | userauth(authctxt, NULL); |
613 | xfree(oidv); | |
23987cb8 | 614 | return; |
615 | } | |
7cac2b65 | 616 | if (!ssh_gssapi_check_oid(gssctxt, oidv+2, oidlen-2)) |
23987cb8 | 617 | fatal("Server returned different OID than expected"); |
23987cb8 | 618 | } |
7cac2b65 | 619 | |
1e608e42 | 620 | packet_check_eom(); |
7cac2b65 | 621 | |
622 | xfree(oidv); | |
623 | ||
5598e598 | 624 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
7cac2b65 | 625 | GSS_C_NO_BUFFER, &send_tok, NULL); |
5598e598 | 626 | if (GSS_ERROR(status)) { |
7cac2b65 | 627 | if (send_tok.length > 0) { |
e23e524c | 628 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
7cac2b65 | 629 | packet_put_string(send_tok.value, send_tok.length); |
e23e524c | 630 | packet_send(); |
7cac2b65 | 631 | gss_release_buffer(&ms, &send_tok); |
e23e524c | 632 | } |
5598e598 | 633 | /* Start again with next method on list */ |
634 | debug("Trying to start again"); | |
7cac2b65 | 635 | userauth(authctxt, NULL); |
5598e598 | 636 | return; |
637 | } | |
638 | ||
7cac2b65 | 639 | /* We must have data to send */ |
5598e598 | 640 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
7cac2b65 | 641 | packet_put_string(send_tok.value, send_tok.length); |
5598e598 | 642 | packet_send(); |
5598e598 | 643 | gss_release_buffer(&ms, &send_tok); |
644 | } | |
645 | ||
646 | void | |
1e608e42 | 647 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) |
5598e598 | 648 | { |
649 | Authctxt *authctxt = ctxt; | |
650 | Gssctxt *gssctxt; | |
7cac2b65 | 651 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
652 | gss_buffer_desc recv_tok; | |
653 | OM_uint32 status, ms; | |
007914b3 | 654 | u_int slen; |
7cac2b65 | 655 | |
5598e598 | 656 | if (authctxt == NULL) |
7cac2b65 | 657 | fatal("input_gssapi_response: no authentication context"); |
5598e598 | 658 | gssctxt = authctxt->methoddata; |
5598e598 | 659 | |
7cac2b65 | 660 | recv_tok.value = packet_get_string(&slen); |
661 | recv_tok.length = slen; /* safe typecast */ | |
5598e598 | 662 | |
1e608e42 | 663 | packet_check_eom(); |
7cac2b65 | 664 | |
665 | status=ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
666 | &recv_tok, &send_tok, NULL); | |
667 | ||
668 | xfree(recv_tok.value); | |
669 | ||
5598e598 | 670 | if (GSS_ERROR(status)) { |
7cac2b65 | 671 | if (send_tok.length > 0) { |
e23e524c | 672 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
7cac2b65 | 673 | packet_put_string(send_tok.value, send_tok.length); |
e23e524c | 674 | packet_send(); |
7cac2b65 | 675 | gss_release_buffer(&ms, &send_tok); |
e23e524c | 676 | } |
5598e598 | 677 | /* Start again with the next method in the list */ |
7cac2b65 | 678 | userauth(authctxt, NULL); |
5598e598 | 679 | return; |
680 | } | |
7cac2b65 | 681 | |
682 | if (send_tok.length > 0) { | |
5598e598 | 683 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
7cac2b65 | 684 | packet_put_string(send_tok.value, send_tok.length); |
5598e598 | 685 | packet_send(); |
7cac2b65 | 686 | gss_release_buffer(&ms, &send_tok); |
5598e598 | 687 | } |
7cac2b65 | 688 | |
5598e598 | 689 | if (status == GSS_S_COMPLETE) { |
690 | /* If that succeeded, send a exchange complete message */ | |
691 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
692 | packet_send(); | |
5598e598 | 693 | } |
694 | } | |
695 | ||
e23e524c | 696 | void |
697 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
698 | { | |
699 | Authctxt *authctxt = ctxt; | |
700 | Gssctxt *gssctxt; | |
7cac2b65 | 701 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
702 | gss_buffer_desc recv_tok; | |
703 | OM_uint32 status, ms; | |
704 | u_int len; | |
705 | ||
e23e524c | 706 | if (authctxt == NULL) |
707 | fatal("input_gssapi_response: no authentication context"); | |
708 | gssctxt = authctxt->methoddata; | |
e23e524c | 709 | |
7cac2b65 | 710 | recv_tok.value = packet_get_string(&len); |
711 | recv_tok.length = len; | |
e23e524c | 712 | |
713 | packet_check_eom(); | |
7cac2b65 | 714 | |
715 | /* Stick it into GSSAPI and see what it says */ | |
716 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
717 | &recv_tok, &send_tok, NULL); | |
718 | ||
719 | xfree(recv_tok.value); | |
720 | gss_release_buffer(&ms, &send_tok); | |
721 | ||
722 | /* Server will be returning a failed packet after this one */ | |
e23e524c | 723 | } |
724 | ||
23987cb8 | 725 | void |
726 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
727 | { | |
7cac2b65 | 728 | OM_uint32 maj, min; |
23987cb8 | 729 | char *msg; |
730 | char *lang; | |
7cac2b65 | 731 | |
23987cb8 | 732 | maj=packet_get_int(); |
733 | min=packet_get_int(); | |
734 | msg=packet_get_string(NULL); | |
735 | lang=packet_get_string(NULL); | |
736 | ||
737 | packet_check_eom(); | |
7cac2b65 | 738 | |
739 | debug("Server GSSAPI Error:\n%s\n", msg); | |
23987cb8 | 740 | xfree(msg); |
741 | xfree(lang); | |
742 | } | |
743 | ||
5598e598 | 744 | int |
745 | userauth_external(Authctxt *authctxt) | |
746 | { | |
7cac2b65 | 747 | static int attempt = 0; |
5598e598 | 748 | |
749 | if (attempt++ >= 1) | |
750 | return 0; | |
751 | ||
41cbd9f8 | 752 | /* The client MUST NOT try this method if initial key exchange |
753 | was not performed using a GSSAPI-based key exchange | |
754 | method. */ | |
755 | if (xxx_kex->kex_type != KEX_GSS_GRP1_SHA1) { | |
756 | debug2("gsskex not performed, skipping external-keyx"); | |
757 | return 0; | |
758 | } | |
759 | ||
5598e598 | 760 | debug2("userauth_external"); |
761 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1baa1dac | 762 | #ifdef GSI |
2e9d2d36 | 763 | if(options.implicit && !(datafellows & SSH_BUG_GSS_EMPTYUSER)) { |
764 | packet_put_cstring(""); | |
765 | } else { | |
1baa1dac | 766 | #endif |
2e9d2d36 | 767 | packet_put_cstring(authctxt->server_user); |
1baa1dac | 768 | #ifdef GSI |
2e9d2d36 | 769 | } |
1baa1dac | 770 | #endif |
5598e598 | 771 | packet_put_cstring(authctxt->service); |
772 | packet_put_cstring(authctxt->method->name); | |
773 | packet_send(); | |
774 | packet_write_wait(); | |
775 | return 1; | |
776 | } | |
777 | #endif /* GSSAPI */ | |
778 | ||
3c0ef626 | 779 | int |
780 | userauth_none(Authctxt *authctxt) | |
781 | { | |
782 | /* initial userauth request */ | |
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_send(); | |
788 | return 1; | |
789 | } | |
790 | ||
791 | int | |
792 | userauth_passwd(Authctxt *authctxt) | |
793 | { | |
794 | static int attempt = 0; | |
510132b6 | 795 | char prompt[150]; |
3c0ef626 | 796 | char *password; |
797 | ||
798 | if (attempt++ >= options.number_of_password_prompts) | |
799 | return 0; | |
800 | ||
1e608e42 | 801 | if (attempt != 1) |
3c0ef626 | 802 | error("Permission denied, please try again."); |
803 | ||
804 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", | |
805 | authctxt->server_user, authctxt->host); | |
806 | password = read_passphrase(prompt, 0); | |
807 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
808 | packet_put_cstring(authctxt->server_user); | |
809 | packet_put_cstring(authctxt->service); | |
810 | packet_put_cstring(authctxt->method->name); | |
811 | packet_put_char(0); | |
812 | packet_put_cstring(password); | |
813 | memset(password, 0, strlen(password)); | |
814 | xfree(password); | |
815 | packet_add_padding(64); | |
816 | packet_send(); | |
510132b6 | 817 | |
44a053a3 | 818 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
510132b6 | 819 | &input_userauth_passwd_changereq); |
820 | ||
3c0ef626 | 821 | return 1; |
822 | } | |
510132b6 | 823 | /* |
824 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
825 | */ | |
826 | void | |
827 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) | |
828 | { | |
829 | Authctxt *authctxt = ctxt; | |
830 | char *info, *lang, *password = NULL, *retype = NULL; | |
831 | char prompt[150]; | |
832 | ||
833 | debug2("input_userauth_passwd_changereq"); | |
834 | ||
835 | if (authctxt == NULL) | |
836 | fatal("input_userauth_passwd_changereq: " | |
837 | "no authentication context"); | |
838 | ||
839 | info = packet_get_string(NULL); | |
840 | lang = packet_get_string(NULL); | |
841 | if (strlen(info) > 0) | |
7cac2b65 | 842 | logit("%s", info); |
510132b6 | 843 | xfree(info); |
844 | xfree(lang); | |
845 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
846 | packet_put_cstring(authctxt->server_user); | |
847 | packet_put_cstring(authctxt->service); | |
848 | packet_put_cstring(authctxt->method->name); | |
849 | packet_put_char(1); /* additional info */ | |
44a053a3 | 850 | snprintf(prompt, sizeof(prompt), |
510132b6 | 851 | "Enter %.30s@%.128s's old password: ", |
852 | authctxt->server_user, authctxt->host); | |
853 | password = read_passphrase(prompt, 0); | |
854 | packet_put_cstring(password); | |
855 | memset(password, 0, strlen(password)); | |
856 | xfree(password); | |
857 | password = NULL; | |
858 | while (password == NULL) { | |
44a053a3 | 859 | snprintf(prompt, sizeof(prompt), |
510132b6 | 860 | "Enter %.30s@%.128s's new password: ", |
861 | authctxt->server_user, authctxt->host); | |
862 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
863 | if (password == NULL) { | |
864 | /* bail out */ | |
865 | return; | |
866 | } | |
44a053a3 | 867 | snprintf(prompt, sizeof(prompt), |
510132b6 | 868 | "Retype %.30s@%.128s's new password: ", |
869 | authctxt->server_user, authctxt->host); | |
870 | retype = read_passphrase(prompt, 0); | |
871 | if (strcmp(password, retype) != 0) { | |
872 | memset(password, 0, strlen(password)); | |
873 | xfree(password); | |
7cac2b65 | 874 | logit("Mismatch; try again, EOF to quit."); |
510132b6 | 875 | password = NULL; |
876 | } | |
877 | memset(retype, 0, strlen(retype)); | |
878 | xfree(retype); | |
879 | } | |
880 | packet_put_cstring(password); | |
881 | memset(password, 0, strlen(password)); | |
882 | xfree(password); | |
883 | packet_add_padding(64); | |
884 | packet_send(); | |
44a053a3 | 885 | |
886 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
510132b6 | 887 | &input_userauth_passwd_changereq); |
888 | } | |
3c0ef626 | 889 | |
7cac2b65 | 890 | static int |
891 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
892 | u_char *data, u_int datalen) | |
3c0ef626 | 893 | { |
7cac2b65 | 894 | Key *prv; |
895 | int ret; | |
896 | ||
897 | /* the agent supports this key */ | |
898 | if (id->ac) | |
899 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
900 | data, datalen)); | |
901 | /* | |
902 | * we have already loaded the private key or | |
903 | * the private key is stored in external hardware | |
904 | */ | |
905 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
906 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
907 | /* load the private key from the file */ | |
908 | if ((prv = load_identity_file(id->filename)) == NULL) | |
909 | return (-1); | |
910 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
911 | key_free(prv); | |
912 | return (ret); | |
3c0ef626 | 913 | } |
914 | ||
915 | static int | |
7cac2b65 | 916 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
3c0ef626 | 917 | { |
918 | Buffer b; | |
919 | u_char *blob, *signature; | |
1e608e42 | 920 | u_int bloblen, slen; |
7cac2b65 | 921 | u_int skip = 0; |
3c0ef626 | 922 | int ret = -1; |
923 | int have_sig = 1; | |
924 | ||
925 | debug3("sign_and_send_pubkey"); | |
926 | ||
7cac2b65 | 927 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 928 | /* we cannot handle this key */ |
929 | debug3("sign_and_send_pubkey: cannot handle key"); | |
930 | return 0; | |
931 | } | |
932 | /* data to be signed */ | |
933 | buffer_init(&b); | |
934 | if (datafellows & SSH_OLD_SESSIONID) { | |
935 | buffer_append(&b, session_id2, session_id2_len); | |
936 | skip = session_id2_len; | |
937 | } else { | |
938 | buffer_put_string(&b, session_id2, session_id2_len); | |
939 | skip = buffer_len(&b); | |
940 | } | |
941 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
942 | buffer_put_cstring(&b, authctxt->server_user); | |
943 | buffer_put_cstring(&b, | |
944 | datafellows & SSH_BUG_PKSERVICE ? | |
945 | "ssh-userauth" : | |
946 | authctxt->service); | |
947 | if (datafellows & SSH_BUG_PKAUTH) { | |
948 | buffer_put_char(&b, have_sig); | |
949 | } else { | |
950 | buffer_put_cstring(&b, authctxt->method->name); | |
951 | buffer_put_char(&b, have_sig); | |
7cac2b65 | 952 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 953 | } |
954 | buffer_put_string(&b, blob, bloblen); | |
955 | ||
956 | /* generate signature */ | |
7cac2b65 | 957 | ret = identity_sign(id, &signature, &slen, |
3c0ef626 | 958 | buffer_ptr(&b), buffer_len(&b)); |
959 | if (ret == -1) { | |
960 | xfree(blob); | |
961 | buffer_free(&b); | |
962 | return 0; | |
963 | } | |
964 | #ifdef DEBUG_PK | |
965 | buffer_dump(&b); | |
966 | #endif | |
967 | if (datafellows & SSH_BUG_PKSERVICE) { | |
968 | buffer_clear(&b); | |
969 | buffer_append(&b, session_id2, session_id2_len); | |
970 | skip = session_id2_len; | |
971 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
972 | buffer_put_cstring(&b, authctxt->server_user); | |
973 | buffer_put_cstring(&b, authctxt->service); | |
974 | buffer_put_cstring(&b, authctxt->method->name); | |
975 | buffer_put_char(&b, have_sig); | |
976 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 977 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 978 | buffer_put_string(&b, blob, bloblen); |
979 | } | |
980 | xfree(blob); | |
981 | ||
982 | /* append signature */ | |
983 | buffer_put_string(&b, signature, slen); | |
984 | xfree(signature); | |
985 | ||
986 | /* skip session id and packet type */ | |
987 | if (buffer_len(&b) < skip + 1) | |
988 | fatal("userauth_pubkey: internal error"); | |
989 | buffer_consume(&b, skip + 1); | |
990 | ||
991 | /* put remaining data from buffer into packet */ | |
992 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
993 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
994 | buffer_free(&b); | |
995 | packet_send(); | |
996 | ||
997 | return 1; | |
998 | } | |
999 | ||
1000 | static int | |
7cac2b65 | 1001 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1002 | { |
1003 | u_char *blob; | |
1e608e42 | 1004 | u_int bloblen, have_sig = 0; |
3c0ef626 | 1005 | |
1006 | debug3("send_pubkey_test"); | |
1007 | ||
7cac2b65 | 1008 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1009 | /* we cannot handle this key */ |
1010 | debug3("send_pubkey_test: cannot handle key"); | |
1011 | return 0; | |
1012 | } | |
1013 | /* register callback for USERAUTH_PK_OK message */ | |
3c0ef626 | 1014 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
1015 | ||
1016 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1017 | packet_put_cstring(authctxt->server_user); | |
1018 | packet_put_cstring(authctxt->service); | |
1019 | packet_put_cstring(authctxt->method->name); | |
1020 | packet_put_char(have_sig); | |
1021 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 1022 | packet_put_cstring(key_ssh_name(id->key)); |
3c0ef626 | 1023 | packet_put_string(blob, bloblen); |
1024 | xfree(blob); | |
1025 | packet_send(); | |
1026 | return 1; | |
1027 | } | |
1028 | ||
1029 | static Key * | |
1030 | load_identity_file(char *filename) | |
1031 | { | |
1032 | Key *private; | |
1033 | char prompt[300], *passphrase; | |
1034 | int quit, i; | |
1035 | struct stat st; | |
1036 | ||
1037 | if (stat(filename, &st) < 0) { | |
1038 | debug3("no such identity: %s", filename); | |
1039 | return NULL; | |
1040 | } | |
1041 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); | |
1042 | if (private == NULL) { | |
1043 | if (options.batch_mode) | |
1044 | return NULL; | |
1045 | snprintf(prompt, sizeof prompt, | |
1e608e42 | 1046 | "Enter passphrase for key '%.100s': ", filename); |
3c0ef626 | 1047 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1048 | passphrase = read_passphrase(prompt, 0); | |
1049 | if (strcmp(passphrase, "") != 0) { | |
1050 | private = key_load_private_type(KEY_UNSPEC, filename, | |
1051 | passphrase, NULL); | |
1052 | quit = 0; | |
1053 | } else { | |
1054 | debug2("no passphrase given, try next key"); | |
1055 | quit = 1; | |
1056 | } | |
1057 | memset(passphrase, 0, strlen(passphrase)); | |
1058 | xfree(passphrase); | |
1059 | if (private != NULL || quit) | |
1060 | break; | |
1061 | debug2("bad passphrase given, try again..."); | |
1062 | } | |
1063 | } | |
1064 | return private; | |
1065 | } | |
1066 | ||
7cac2b65 | 1067 | /* |
1068 | * try keys in the following order: | |
1069 | * 1. agent keys that are found in the config file | |
1070 | * 2. other agent keys | |
1071 | * 3. keys that are only listed in the config file | |
1072 | */ | |
1073 | static void | |
1074 | pubkey_prepare(Authctxt *authctxt) | |
3c0ef626 | 1075 | { |
7cac2b65 | 1076 | Identity *id; |
1077 | Idlist agent, files, *preferred; | |
1078 | Key *key; | |
1079 | AuthenticationConnection *ac; | |
1080 | char *comment; | |
1081 | int i, found; | |
1082 | ||
1083 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1084 | TAILQ_INIT(&files); /* keys from the config file */ | |
1085 | preferred = &authctxt->keys; | |
1086 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1087 | ||
1088 | /* list of keys stored in the filesystem */ | |
1089 | for (i = 0; i < options.num_identity_files; i++) { | |
1090 | key = options.identity_keys[i]; | |
1091 | if (key && key->type == KEY_RSA1) | |
1092 | continue; | |
1093 | options.identity_keys[i] = NULL; | |
1094 | id = xmalloc(sizeof(*id)); | |
1095 | memset(id, 0, sizeof(*id)); | |
1096 | id->key = key; | |
1097 | id->filename = xstrdup(options.identity_files[i]); | |
1098 | TAILQ_INSERT_TAIL(&files, id, next); | |
1099 | } | |
1100 | /* list of keys supported by the agent */ | |
1101 | if ((ac = ssh_get_authentication_connection())) { | |
1102 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1103 | key != NULL; | |
1104 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1105 | found = 0; | |
1106 | TAILQ_FOREACH(id, &files, next) { | |
1107 | /* agent keys from the config file are preferred */ | |
1108 | if (key_equal(key, id->key)) { | |
1109 | key_free(key); | |
1110 | xfree(comment); | |
1111 | TAILQ_REMOVE(&files, id, next); | |
1112 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1113 | id->ac = ac; | |
1114 | found = 1; | |
1115 | break; | |
1116 | } | |
1117 | } | |
1118 | if (!found) { | |
1119 | id = xmalloc(sizeof(*id)); | |
1120 | memset(id, 0, sizeof(*id)); | |
1121 | id->key = key; | |
1122 | id->filename = comment; | |
1123 | id->ac = ac; | |
1124 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1125 | } | |
1126 | } | |
1127 | /* append remaining agent keys */ | |
1128 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1129 | TAILQ_REMOVE(&agent, id, next); | |
1130 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1131 | } | |
1132 | authctxt->agent = ac; | |
1133 | } | |
1134 | /* append remaining keys from the config file */ | |
1135 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1136 | TAILQ_REMOVE(&files, id, next); | |
1137 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1138 | } | |
1139 | TAILQ_FOREACH(id, preferred, next) { | |
1140 | debug2("key: %s (%p)", id->filename, id->key); | |
1141 | } | |
3c0ef626 | 1142 | } |
1143 | ||
7cac2b65 | 1144 | static void |
1145 | pubkey_cleanup(Authctxt *authctxt) | |
3c0ef626 | 1146 | { |
7cac2b65 | 1147 | Identity *id; |
1148 | ||
1149 | if (authctxt->agent != NULL) | |
1150 | ssh_close_authentication_connection(authctxt->agent); | |
1151 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1152 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1153 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1154 | if (id->key) | |
1155 | key_free(id->key); | |
1156 | if (id->filename) | |
1157 | xfree(id->filename); | |
1158 | xfree(id); | |
3c0ef626 | 1159 | } |
3c0ef626 | 1160 | } |
1161 | ||
1162 | int | |
1163 | userauth_pubkey(Authctxt *authctxt) | |
1164 | { | |
7cac2b65 | 1165 | Identity *id; |
3c0ef626 | 1166 | int sent = 0; |
3c0ef626 | 1167 | |
7cac2b65 | 1168 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1169 | if (id->tried++) | |
1170 | return (0); | |
1171 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1172 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1173 | /* | |
1174 | * send a test message if we have the public key. for | |
1175 | * encrypted keys we cannot do this and have to load the | |
1176 | * private key instead | |
1177 | */ | |
1178 | if (id->key && id->key->type != KEY_RSA1) { | |
1179 | debug("Offering public key: %s", id->filename); | |
1180 | sent = send_pubkey_test(authctxt, id); | |
1181 | } else if (id->key == NULL) { | |
1182 | debug("Trying private key: %s", id->filename); | |
1183 | id->key = load_identity_file(id->filename); | |
1184 | if (id->key != NULL) { | |
1185 | id->isprivate = 1; | |
1186 | sent = sign_and_send_pubkey(authctxt, id); | |
1187 | key_free(id->key); | |
1188 | id->key = NULL; | |
3c0ef626 | 1189 | } |
3c0ef626 | 1190 | } |
7cac2b65 | 1191 | if (sent) |
1192 | return (sent); | |
3c0ef626 | 1193 | } |
7cac2b65 | 1194 | return (0); |
3c0ef626 | 1195 | } |
1196 | ||
1197 | /* | |
1198 | * Send userauth request message specifying keyboard-interactive method. | |
1199 | */ | |
1200 | int | |
1201 | userauth_kbdint(Authctxt *authctxt) | |
1202 | { | |
1203 | static int attempt = 0; | |
1204 | ||
1205 | if (attempt++ >= options.number_of_password_prompts) | |
1206 | return 0; | |
1207 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ | |
1208 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1209 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1210 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | debug2("userauth_kbdint"); | |
1215 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1216 | packet_put_cstring(authctxt->server_user); | |
1217 | packet_put_cstring(authctxt->service); | |
1218 | packet_put_cstring(authctxt->method->name); | |
1219 | packet_put_cstring(""); /* lang */ | |
1220 | packet_put_cstring(options.kbd_interactive_devices ? | |
1221 | options.kbd_interactive_devices : ""); | |
1222 | packet_send(); | |
1223 | ||
1224 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1225 | return 1; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE | |
1230 | */ | |
1231 | void | |
1e608e42 | 1232 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1233 | { |
1234 | Authctxt *authctxt = ctxt; | |
1235 | char *name, *inst, *lang, *prompt, *response; | |
1236 | u_int num_prompts, i; | |
1237 | int echo = 0; | |
1238 | ||
1239 | debug2("input_userauth_info_req"); | |
1240 | ||
1241 | if (authctxt == NULL) | |
1242 | fatal("input_userauth_info_req: no authentication context"); | |
1243 | ||
1244 | authctxt->info_req_seen = 1; | |
1245 | ||
1246 | name = packet_get_string(NULL); | |
1247 | inst = packet_get_string(NULL); | |
1248 | lang = packet_get_string(NULL); | |
1249 | if (strlen(name) > 0) | |
7cac2b65 | 1250 | logit("%s", name); |
3c0ef626 | 1251 | if (strlen(inst) > 0) |
7cac2b65 | 1252 | logit("%s", inst); |
3c0ef626 | 1253 | xfree(name); |
1254 | xfree(inst); | |
1255 | xfree(lang); | |
1256 | ||
1257 | num_prompts = packet_get_int(); | |
1258 | /* | |
1259 | * Begin to build info response packet based on prompts requested. | |
1260 | * We commit to providing the correct number of responses, so if | |
1261 | * further on we run into a problem that prevents this, we have to | |
1262 | * be sure and clean this up and send a correct error response. | |
1263 | */ | |
1264 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1265 | packet_put_int(num_prompts); | |
1266 | ||
1267 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); | |
1268 | for (i = 0; i < num_prompts; i++) { | |
1269 | prompt = packet_get_string(NULL); | |
1270 | echo = packet_get_char(); | |
1271 | ||
1272 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); | |
1273 | ||
1274 | packet_put_cstring(response); | |
1275 | memset(response, 0, strlen(response)); | |
1276 | xfree(response); | |
1277 | xfree(prompt); | |
1278 | } | |
1e608e42 | 1279 | packet_check_eom(); /* done with parsing incoming message. */ |
3c0ef626 | 1280 | |
1281 | packet_add_padding(64); | |
1282 | packet_send(); | |
1283 | } | |
1284 | ||
44a053a3 | 1285 | static int |
276b07a3 | 1286 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
44a053a3 | 1287 | u_char *data, u_int datalen) |
1288 | { | |
1289 | Buffer b; | |
1290 | struct stat st; | |
1291 | pid_t pid; | |
1292 | int to[2], from[2], status, version = 2; | |
1293 | ||
bfe49944 | 1294 | debug2("ssh_keysign called"); |
44a053a3 | 1295 | |
1296 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { | |
1297 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1298 | return -1; | |
1299 | } | |
1300 | if (fflush(stdout) != 0) | |
1301 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1302 | if (pipe(to) < 0) { | |
1303 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1304 | return -1; | |
1305 | } | |
1306 | if (pipe(from) < 0) { | |
1307 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1308 | return -1; | |
1309 | } | |
1310 | if ((pid = fork()) < 0) { | |
1311 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1312 | return -1; | |
1313 | } | |
1314 | if (pid == 0) { | |
1315 | seteuid(getuid()); | |
1316 | setuid(getuid()); | |
1317 | close(from[0]); | |
1318 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1319 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1320 | close(to[1]); | |
1321 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1322 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1323 | close(from[1]); | |
1324 | close(to[0]); | |
1325 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); | |
1326 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, | |
1327 | strerror(errno)); | |
1328 | } | |
1329 | close(from[1]); | |
1330 | close(to[0]); | |
1331 | ||
1332 | buffer_init(&b); | |
1333 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ | |
1334 | buffer_put_string(&b, data, datalen); | |
d03f4262 | 1335 | ssh_msg_send(to[1], version, &b); |
44a053a3 | 1336 | |
d03f4262 | 1337 | if (ssh_msg_recv(from[0], &b) < 0) { |
44a053a3 | 1338 | error("ssh_keysign: no reply"); |
1339 | buffer_clear(&b); | |
1340 | return -1; | |
1341 | } | |
1342 | close(from[0]); | |
1343 | close(to[1]); | |
1344 | ||
1345 | while (waitpid(pid, &status, 0) < 0) | |
1346 | if (errno != EINTR) | |
1347 | break; | |
1348 | ||
1349 | if (buffer_get_char(&b) != version) { | |
1350 | error("ssh_keysign: bad version"); | |
1351 | buffer_clear(&b); | |
1352 | return -1; | |
1353 | } | |
1354 | *sigp = buffer_get_string(&b, lenp); | |
1355 | buffer_clear(&b); | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
3c0ef626 | 1360 | int |
1361 | userauth_hostbased(Authctxt *authctxt) | |
1362 | { | |
1363 | Key *private = NULL; | |
44a053a3 | 1364 | Sensitive *sensitive = authctxt->sensitive; |
3c0ef626 | 1365 | Buffer b; |
1366 | u_char *signature, *blob; | |
1367 | char *chost, *pkalg, *p; | |
1368 | const char *service; | |
1369 | u_int blen, slen; | |
1370 | int ok, i, len, found = 0; | |
1371 | ||
1372 | /* check for a useful key */ | |
44a053a3 | 1373 | for (i = 0; i < sensitive->nkeys; i++) { |
1374 | private = sensitive->keys[i]; | |
3c0ef626 | 1375 | if (private && private->type != KEY_RSA1) { |
1376 | found = 1; | |
1377 | /* we take and free the key */ | |
44a053a3 | 1378 | sensitive->keys[i] = NULL; |
3c0ef626 | 1379 | break; |
1380 | } | |
1381 | } | |
1382 | if (!found) { | |
bfe49944 | 1383 | debug("No more client hostkeys for hostbased authentication."); |
3c0ef626 | 1384 | return 0; |
1385 | } | |
1386 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1387 | key_free(private); | |
1388 | return 0; | |
1389 | } | |
1390 | /* figure out a name for the client host */ | |
1391 | p = get_local_name(packet_get_connection_in()); | |
1392 | if (p == NULL) { | |
1393 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1394 | key_free(private); | |
1395 | return 0; | |
1396 | } | |
1397 | len = strlen(p) + 2; | |
1398 | chost = xmalloc(len); | |
1399 | strlcpy(chost, p, len); | |
1400 | strlcat(chost, ".", len); | |
1401 | debug2("userauth_hostbased: chost %s", chost); | |
bfe49944 | 1402 | xfree(p); |
3c0ef626 | 1403 | |
1404 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : | |
1405 | authctxt->service; | |
1406 | pkalg = xstrdup(key_ssh_name(private)); | |
1407 | buffer_init(&b); | |
1408 | /* construct data */ | |
1409 | buffer_put_string(&b, session_id2, session_id2_len); | |
1410 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1411 | buffer_put_cstring(&b, authctxt->server_user); | |
1412 | buffer_put_cstring(&b, service); | |
1413 | buffer_put_cstring(&b, authctxt->method->name); | |
1414 | buffer_put_cstring(&b, pkalg); | |
1415 | buffer_put_string(&b, blob, blen); | |
1416 | buffer_put_cstring(&b, chost); | |
1417 | buffer_put_cstring(&b, authctxt->local_user); | |
1418 | #ifdef DEBUG_PK | |
1419 | buffer_dump(&b); | |
1420 | #endif | |
44a053a3 | 1421 | if (sensitive->external_keysign) |
1422 | ok = ssh_keysign(private, &signature, &slen, | |
1423 | buffer_ptr(&b), buffer_len(&b)); | |
1424 | else | |
1425 | ok = key_sign(private, &signature, &slen, | |
1426 | buffer_ptr(&b), buffer_len(&b)); | |
3c0ef626 | 1427 | key_free(private); |
1428 | buffer_free(&b); | |
1429 | if (ok != 0) { | |
1430 | error("key_sign failed"); | |
1431 | xfree(chost); | |
1432 | xfree(pkalg); | |
1433 | return 0; | |
1434 | } | |
1435 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1436 | packet_put_cstring(authctxt->server_user); | |
1437 | packet_put_cstring(authctxt->service); | |
1438 | packet_put_cstring(authctxt->method->name); | |
1439 | packet_put_cstring(pkalg); | |
1440 | packet_put_string(blob, blen); | |
1441 | packet_put_cstring(chost); | |
1442 | packet_put_cstring(authctxt->local_user); | |
1443 | packet_put_string(signature, slen); | |
1444 | memset(signature, 's', slen); | |
1445 | xfree(signature); | |
1446 | xfree(chost); | |
1447 | xfree(pkalg); | |
1448 | ||
1449 | packet_send(); | |
1450 | return 1; | |
1451 | } | |
1452 | ||
1453 | /* find auth method */ | |
1454 | ||
1455 | /* | |
1456 | * given auth method name, if configurable options permit this method fill | |
1457 | * in auth_ident field and return true, otherwise return false. | |
1458 | */ | |
1459 | static int | |
1460 | authmethod_is_enabled(Authmethod *method) | |
1461 | { | |
1462 | if (method == NULL) | |
1463 | return 0; | |
1464 | /* return false if options indicate this method is disabled */ | |
1465 | if (method->enabled == NULL || *method->enabled == 0) | |
1466 | return 0; | |
1467 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1468 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1469 | return 0; | |
1470 | return 1; | |
1471 | } | |
1472 | ||
1473 | static Authmethod * | |
1474 | authmethod_lookup(const char *name) | |
1475 | { | |
1476 | Authmethod *method = NULL; | |
1477 | if (name != NULL) | |
1478 | for (method = authmethods; method->name != NULL; method++) | |
1479 | if (strcmp(name, method->name) == 0) | |
1480 | return method; | |
1481 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1482 | return NULL; | |
1483 | } | |
1484 | ||
1485 | /* XXX internal state */ | |
1486 | static Authmethod *current = NULL; | |
1487 | static char *supported = NULL; | |
1488 | static char *preferred = NULL; | |
276b07a3 | 1489 | |
3c0ef626 | 1490 | /* |
1491 | * Given the authentication method list sent by the server, return the | |
1492 | * next method we should try. If the server initially sends a nil list, | |
1493 | * use a built-in default list. | |
1494 | */ | |
1495 | static Authmethod * | |
1496 | authmethod_get(char *authlist) | |
1497 | { | |
3c0ef626 | 1498 | char *name = NULL; |
1e608e42 | 1499 | u_int next; |
3c0ef626 | 1500 | |
1501 | /* Use a suitable default if we're passed a nil list. */ | |
1502 | if (authlist == NULL || strlen(authlist) == 0) | |
1503 | authlist = options.preferred_authentications; | |
1504 | ||
1505 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1506 | debug3("start over, passed a different list %s", authlist); | |
1507 | if (supported != NULL) | |
1508 | xfree(supported); | |
1509 | supported = xstrdup(authlist); | |
1510 | preferred = options.preferred_authentications; | |
1511 | debug3("preferred %s", preferred); | |
1512 | current = NULL; | |
1513 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1514 | return current; | |
1515 | ||
1516 | for (;;) { | |
1517 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
bfe49944 | 1518 | debug("No more authentication methods to try."); |
3c0ef626 | 1519 | current = NULL; |
1520 | return NULL; | |
1521 | } | |
1522 | preferred += next; | |
1523 | debug3("authmethod_lookup %s", name); | |
1524 | debug3("remaining preferred: %s", preferred); | |
1525 | if ((current = authmethod_lookup(name)) != NULL && | |
1526 | authmethod_is_enabled(current)) { | |
1527 | debug3("authmethod_is_enabled %s", name); | |
bfe49944 | 1528 | debug("Next authentication method: %s", name); |
3c0ef626 | 1529 | return current; |
1530 | } | |
1531 | } | |
1532 | } | |
1533 | ||
3c0ef626 | 1534 | static char * |
1535 | authmethods_get(void) | |
1536 | { | |
1537 | Authmethod *method = NULL; | |
1e608e42 | 1538 | Buffer b; |
1539 | char *list; | |
3c0ef626 | 1540 | |
1e608e42 | 1541 | buffer_init(&b); |
3c0ef626 | 1542 | for (method = authmethods; method->name != NULL; method++) { |
1543 | if (authmethod_is_enabled(method)) { | |
1e608e42 | 1544 | if (buffer_len(&b) > 0) |
1545 | buffer_append(&b, ",", 1); | |
1546 | buffer_append(&b, method->name, strlen(method->name)); | |
3c0ef626 | 1547 | } |
1548 | } | |
1e608e42 | 1549 | buffer_append(&b, "\0", 1); |
1550 | list = xstrdup(buffer_ptr(&b)); | |
1551 | buffer_free(&b); | |
1552 | return list; | |
3c0ef626 | 1553 | } |