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cf851879 | 1 | /* $OpenBSD: sshconnect2.c,v 1.159 2006/08/01 23:22:48 stevesk Exp $ */ |
a306f2dd | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
a306f2dd | 13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
c3ff311a | 27 | |
aa2eae64 | 28 | #include <sys/types.h> |
29 | #include <sys/wait.h> | |
4095f623 | 30 | #include <sys/stat.h> |
a306f2dd | 31 | |
028094f4 | 32 | #include <errno.h> |
cf851879 | 33 | #include <stdio.h> |
00146caa | 34 | #include <string.h> |
67514848 | 35 | #include <unistd.h> |
028094f4 | 36 | |
751092f9 | 37 | #include "openbsd-compat/sys-queue.h" |
38 | ||
a306f2dd | 39 | #include "ssh.h" |
42f11eb2 | 40 | #include "ssh2.h" |
a306f2dd | 41 | #include "xmalloc.h" |
a306f2dd | 42 | #include "buffer.h" |
43 | #include "packet.h" | |
a306f2dd | 44 | #include "compat.h" |
a306f2dd | 45 | #include "bufaux.h" |
42f11eb2 | 46 | #include "cipher.h" |
a306f2dd | 47 | #include "kex.h" |
48 | #include "myproposal.h" | |
a306f2dd | 49 | #include "sshconnect.h" |
50 | #include "authfile.h" | |
db1cd2f3 | 51 | #include "dh.h" |
2e73a022 | 52 | #include "authfd.h" |
42f11eb2 | 53 | #include "log.h" |
54 | #include "readconf.h" | |
58ae9cb8 | 55 | #include "misc.h" |
cab80f75 | 56 | #include "match.h" |
a5c9ffdb | 57 | #include "dispatch.h" |
8002af61 | 58 | #include "canohost.h" |
39c00dc2 | 59 | #include "msg.h" |
60 | #include "pathnames.h" | |
82aeee5d | 61 | #include "uidswap.h" |
94ec8c6b | 62 | |
7364bd04 | 63 | #ifdef GSSAPI |
64 | #include "ssh-gss.h" | |
65 | #endif | |
66 | ||
a306f2dd | 67 | /* import */ |
68 | extern char *client_version_string; | |
69 | extern char *server_version_string; | |
70 | extern Options options; | |
71 | ||
72 | /* | |
73 | * SSH2 key exchange | |
74 | */ | |
75 | ||
1e3b8b07 | 76 | u_char *session_id2 = NULL; |
a27002e5 | 77 | u_int session_id2_len = 0; |
a306f2dd | 78 | |
a5c9ffdb | 79 | char *xxx_host; |
80 | struct sockaddr *xxx_hostaddr; | |
81 | ||
e092ce67 | 82 | Kex *xxx_kex = NULL; |
83 | ||
396c147e | 84 | static int |
f49bc4f7 | 85 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 86 | { |
f49bc4f7 | 87 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 88 | fatal("Host key verification failed."); |
a5c9ffdb | 89 | return 0; |
90 | } | |
91 | ||
a306f2dd | 92 | void |
94ec8c6b | 93 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
94 | { | |
94ec8c6b | 95 | Kex *kex; |
a5c9ffdb | 96 | |
97 | xxx_host = host; | |
98 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 99 | |
c523303b | 100 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 101 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 102 | options.ciphers = NULL; |
94ec8c6b | 103 | } |
104 | if (options.ciphers != NULL) { | |
105 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
106 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
107 | } | |
1ad64a93 | 108 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
109 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
110 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
111 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 112 | if (options.compression) { |
b2552997 | 113 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 114 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 115 | } else { |
b2552997 | 116 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 117 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 118 | } |
b2552997 | 119 | if (options.macs != NULL) { |
120 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
121 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
122 | } | |
e961a8f9 | 123 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 124 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 125 | options.hostkeyalgorithms; |
94ec8c6b | 126 | |
ffd7b36b | 127 | if (options.rekey_limit) |
128 | packet_set_rekey_limit(options.rekey_limit); | |
129 | ||
7a37c112 | 130 | /* start key exchange */ |
d8ee838b | 131 | kex = kex_setup(myproposal); |
98a58eda | 132 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 133 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 134 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 135 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 136 | kex->client_version_string=client_version_string; |
137 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 138 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 139 | |
e092ce67 | 140 | xxx_kex = kex; |
141 | ||
c422989b | 142 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 143 | |
d1ac6175 | 144 | session_id2 = kex->session_id; |
145 | session_id2_len = kex->session_id_len; | |
146 | ||
94ec8c6b | 147 | #ifdef DEBUG_KEXDH |
148 | /* send 1st encrypted/maced/compressed message */ | |
149 | packet_start(SSH2_MSG_IGNORE); | |
150 | packet_put_cstring("markus"); | |
151 | packet_send(); | |
152 | packet_write_wait(); | |
153 | #endif | |
a306f2dd | 154 | } |
71276795 | 155 | |
a306f2dd | 156 | /* |
157 | * Authenticate user | |
158 | */ | |
188adeb2 | 159 | |
160 | typedef struct Authctxt Authctxt; | |
161 | typedef struct Authmethod Authmethod; | |
43348518 | 162 | typedef struct identity Identity; |
163 | typedef struct idlist Idlist; | |
164 | ||
165 | struct identity { | |
166 | TAILQ_ENTRY(identity) next; | |
167 | AuthenticationConnection *ac; /* set if agent supports key */ | |
168 | Key *key; /* public/private key */ | |
169 | char *filename; /* comment for agent-only keys */ | |
170 | int tried; | |
171 | int isprivate; /* key points to the private key */ | |
172 | }; | |
173 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 174 | |
175 | struct Authctxt { | |
176 | const char *server_user; | |
8002af61 | 177 | const char *local_user; |
188adeb2 | 178 | const char *host; |
179 | const char *service; | |
188adeb2 | 180 | Authmethod *method; |
94ec8c6b | 181 | int success; |
fee56204 | 182 | char *authlist; |
8002af61 | 183 | /* pubkey */ |
43348518 | 184 | Idlist keys; |
8002af61 | 185 | AuthenticationConnection *agent; |
186 | /* hostbased */ | |
39c00dc2 | 187 | Sensitive *sensitive; |
6b759005 | 188 | /* kbd-interactive */ |
189 | int info_req_seen; | |
7364bd04 | 190 | /* generic */ |
191 | void *methoddata; | |
188adeb2 | 192 | }; |
193 | struct Authmethod { | |
194 | char *name; /* string to compare against server's list */ | |
195 | int (*userauth)(Authctxt *authctxt); | |
196 | int *enabled; /* flag in option struct that enables method */ | |
197 | int *batch_flag; /* flag in option struct that disables method */ | |
198 | }; | |
199 | ||
7819b5c3 | 200 | void input_userauth_success(int, u_int32_t, void *); |
201 | void input_userauth_failure(int, u_int32_t, void *); | |
202 | void input_userauth_banner(int, u_int32_t, void *); | |
203 | void input_userauth_error(int, u_int32_t, void *); | |
204 | void input_userauth_info_req(int, u_int32_t, void *); | |
205 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 206 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 207 | |
d5bb9418 | 208 | int userauth_none(Authctxt *); |
209 | int userauth_pubkey(Authctxt *); | |
210 | int userauth_passwd(Authctxt *); | |
211 | int userauth_kbdint(Authctxt *); | |
212 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 213 | int userauth_kerberos(Authctxt *); |
188adeb2 | 214 | |
7364bd04 | 215 | #ifdef GSSAPI |
216 | int userauth_gssapi(Authctxt *authctxt); | |
217 | void input_gssapi_response(int type, u_int32_t, void *); | |
218 | void input_gssapi_token(int type, u_int32_t, void *); | |
219 | void input_gssapi_hash(int type, u_int32_t, void *); | |
220 | void input_gssapi_error(int, u_int32_t, void *); | |
221 | void input_gssapi_errtok(int, u_int32_t, void *); | |
222 | #endif | |
223 | ||
d5bb9418 | 224 | void userauth(Authctxt *, char *); |
fee56204 | 225 | |
43348518 | 226 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 227 | static void pubkey_prepare(Authctxt *); |
228 | static void pubkey_cleanup(Authctxt *); | |
229 | static Key *load_identity_file(char *); | |
fee56204 | 230 | |
396c147e | 231 | static Authmethod *authmethod_get(char *authlist); |
232 | static Authmethod *authmethod_lookup(const char *name); | |
233 | static char *authmethods_get(void); | |
188adeb2 | 234 | |
235 | Authmethod authmethods[] = { | |
7364bd04 | 236 | #ifdef GSSAPI |
0789992b | 237 | {"gssapi-with-mic", |
7364bd04 | 238 | userauth_gssapi, |
239 | &options.gss_authentication, | |
240 | NULL}, | |
241 | #endif | |
3398dda9 | 242 | {"hostbased", |
243 | userauth_hostbased, | |
244 | &options.hostbased_authentication, | |
245 | NULL}, | |
9f37c0af | 246 | {"publickey", |
247 | userauth_pubkey, | |
248 | &options.pubkey_authentication, | |
249 | NULL}, | |
94ec8c6b | 250 | {"keyboard-interactive", |
251 | userauth_kbdint, | |
252 | &options.kbd_interactive_authentication, | |
253 | &options.batch_mode}, | |
9f37c0af | 254 | {"password", |
255 | userauth_passwd, | |
256 | &options.password_authentication, | |
257 | &options.batch_mode}, | |
94ec8c6b | 258 | {"none", |
259 | userauth_none, | |
260 | NULL, | |
261 | NULL}, | |
188adeb2 | 262 | {NULL, NULL, NULL, NULL} |
263 | }; | |
264 | ||
265 | void | |
8002af61 | 266 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 267 | Sensitive *sensitive) |
188adeb2 | 268 | { |
269 | Authctxt authctxt; | |
270 | int type; | |
188adeb2 | 271 | |
5ba55ada | 272 | if (options.challenge_response_authentication) |
d464095c | 273 | options.kbd_interactive_authentication = 1; |
274 | ||
188adeb2 | 275 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
276 | packet_put_cstring("ssh-userauth"); | |
277 | packet_send(); | |
a77673cc | 278 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 279 | packet_write_wait(); |
54a5250f | 280 | type = packet_read(); |
a77673cc | 281 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
282 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 283 | if (packet_remaining() > 0) { |
54a5250f | 284 | char *reply = packet_get_string(NULL); |
a77673cc | 285 | debug2("service_accept: %s", reply); |
188adeb2 | 286 | xfree(reply); |
188adeb2 | 287 | } else { |
6226a8f8 | 288 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 289 | } |
95500969 | 290 | packet_check_eom(); |
a77673cc | 291 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 292 | |
cab80f75 | 293 | if (options.preferred_authentications == NULL) |
294 | options.preferred_authentications = authmethods_get(); | |
295 | ||
188adeb2 | 296 | /* setup authentication context */ |
6b759005 | 297 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 298 | pubkey_prepare(&authctxt); |
188adeb2 | 299 | authctxt.server_user = server_user; |
8002af61 | 300 | authctxt.local_user = local_user; |
188adeb2 | 301 | authctxt.host = host; |
302 | authctxt.service = "ssh-connection"; /* service name */ | |
303 | authctxt.success = 0; | |
94ec8c6b | 304 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 305 | authctxt.authlist = NULL; |
7364bd04 | 306 | authctxt.methoddata = NULL; |
39c00dc2 | 307 | authctxt.sensitive = sensitive; |
6b759005 | 308 | authctxt.info_req_seen = 0; |
94ec8c6b | 309 | if (authctxt.method == NULL) |
310 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 311 | |
312 | /* initial userauth request */ | |
94ec8c6b | 313 | userauth_none(&authctxt); |
188adeb2 | 314 | |
7a37c112 | 315 | dispatch_init(&input_userauth_error); |
188adeb2 | 316 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
317 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 318 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 319 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
320 | ||
43348518 | 321 | pubkey_cleanup(&authctxt); |
b8c2031b | 322 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
323 | ||
6226a8f8 | 324 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 325 | } |
b8c2031b | 326 | |
188adeb2 | 327 | void |
fee56204 | 328 | userauth(Authctxt *authctxt, char *authlist) |
329 | { | |
7364bd04 | 330 | if (authctxt->methoddata) { |
331 | xfree(authctxt->methoddata); | |
332 | authctxt->methoddata = NULL; | |
333 | } | |
fee56204 | 334 | if (authlist == NULL) { |
335 | authlist = authctxt->authlist; | |
336 | } else { | |
337 | if (authctxt->authlist) | |
338 | xfree(authctxt->authlist); | |
339 | authctxt->authlist = authlist; | |
340 | } | |
341 | for (;;) { | |
342 | Authmethod *method = authmethod_get(authlist); | |
343 | if (method == NULL) | |
344 | fatal("Permission denied (%s).", authlist); | |
345 | authctxt->method = method; | |
b8c2031b | 346 | |
347 | /* reset the per method handler */ | |
348 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
349 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
350 | ||
351 | /* and try new method */ | |
fee56204 | 352 | if (method->userauth(authctxt) != 0) { |
353 | debug2("we sent a %s packet, wait for reply", method->name); | |
354 | break; | |
355 | } else { | |
356 | debug2("we did not send a packet, disable method"); | |
357 | method->enabled = NULL; | |
358 | } | |
359 | } | |
360 | } | |
d6133f43 | 361 | |
fee56204 | 362 | void |
7819b5c3 | 363 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 364 | { |
9616313f | 365 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 366 | "type %d", type); |
9616313f | 367 | } |
d6133f43 | 368 | |
9616313f | 369 | void |
7819b5c3 | 370 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 371 | { |
372 | char *msg, *lang; | |
c8f0cf13 | 373 | |
9616313f | 374 | debug3("input_userauth_banner"); |
375 | msg = packet_get_string(NULL); | |
376 | lang = packet_get_string(NULL); | |
19e633e7 | 377 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
378 | fprintf(stderr, "%s", msg); | |
9616313f | 379 | xfree(msg); |
380 | xfree(lang); | |
188adeb2 | 381 | } |
d6133f43 | 382 | |
188adeb2 | 383 | void |
7819b5c3 | 384 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 385 | { |
386 | Authctxt *authctxt = ctxt; | |
387 | if (authctxt == NULL) | |
388 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 389 | if (authctxt->authlist) { |
fee56204 | 390 | xfree(authctxt->authlist); |
c8f0cf13 | 391 | authctxt->authlist = NULL; |
392 | } | |
393 | if (authctxt->methoddata) { | |
7364bd04 | 394 | xfree(authctxt->methoddata); |
c8f0cf13 | 395 | authctxt->methoddata = NULL; |
396 | } | |
188adeb2 | 397 | authctxt->success = 1; /* break out */ |
398 | } | |
d6133f43 | 399 | |
188adeb2 | 400 | void |
7819b5c3 | 401 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 402 | { |
188adeb2 | 403 | Authctxt *authctxt = ctxt; |
404 | char *authlist = NULL; | |
405 | int partial; | |
188adeb2 | 406 | |
407 | if (authctxt == NULL) | |
408 | fatal("input_userauth_failure: no authentication context"); | |
409 | ||
94ec8c6b | 410 | authlist = packet_get_string(NULL); |
188adeb2 | 411 | partial = packet_get_char(); |
95500969 | 412 | packet_check_eom(); |
188adeb2 | 413 | |
414 | if (partial != 0) | |
bbe88b6d | 415 | logit("Authenticated with partial success."); |
6226a8f8 | 416 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 417 | |
fee56204 | 418 | userauth(authctxt, authlist); |
419 | } | |
420 | void | |
7819b5c3 | 421 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 422 | { |
423 | Authctxt *authctxt = ctxt; | |
424 | Key *key = NULL; | |
43348518 | 425 | Identity *id = NULL; |
fee56204 | 426 | Buffer b; |
c66f9d0e | 427 | int pktype, sent = 0; |
428 | u_int alen, blen; | |
429 | char *pkalg, *fp; | |
430 | u_char *pkblob; | |
fee56204 | 431 | |
432 | if (authctxt == NULL) | |
433 | fatal("input_userauth_pk_ok: no authentication context"); | |
434 | if (datafellows & SSH_BUG_PKOK) { | |
435 | /* this is similar to SSH_BUG_PKAUTH */ | |
436 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
437 | pkblob = packet_get_string(&blen); | |
438 | buffer_init(&b); | |
439 | buffer_append(&b, pkblob, blen); | |
440 | pkalg = buffer_get_string(&b, &alen); | |
441 | buffer_free(&b); | |
442 | } else { | |
443 | pkalg = packet_get_string(&alen); | |
444 | pkblob = packet_get_string(&blen); | |
445 | } | |
95500969 | 446 | packet_check_eom(); |
fee56204 | 447 | |
43348518 | 448 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 449 | |
43348518 | 450 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
451 | debug("unknown pkalg %s", pkalg); | |
452 | goto done; | |
453 | } | |
454 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
455 | debug("no key from blob. pkalg %s", pkalg); | |
456 | goto done; | |
457 | } | |
458 | if (key->type != pktype) { | |
459 | error("input_userauth_pk_ok: type mismatch " | |
460 | "for decoded key (received %d, expected %d)", | |
461 | key->type, pktype); | |
462 | goto done; | |
463 | } | |
464 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
465 | debug2("input_userauth_pk_ok: fp %s", fp); | |
466 | xfree(fp); | |
467 | ||
b56e99e2 | 468 | /* |
469 | * search keys in the reverse order, because last candidate has been | |
470 | * moved to the end of the queue. this also avoids confusion by | |
471 | * duplicate keys | |
472 | */ | |
484b2208 | 473 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 474 | if (key_equal(key, id->key)) { |
475 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 476 | break; |
477 | } | |
43348518 | 478 | } |
479 | done: | |
fee56204 | 480 | if (key != NULL) |
481 | key_free(key); | |
482 | xfree(pkalg); | |
483 | xfree(pkblob); | |
484 | ||
343288b8 | 485 | /* try another method if we did not send a packet */ |
fee56204 | 486 | if (sent == 0) |
487 | userauth(authctxt, NULL); | |
188adeb2 | 488 | } |
489 | ||
7364bd04 | 490 | #ifdef GSSAPI |
aff51935 | 491 | int |
7364bd04 | 492 | userauth_gssapi(Authctxt *authctxt) |
493 | { | |
494 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 495 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 496 | static u_int mech = 0; |
7364bd04 | 497 | OM_uint32 min; |
498 | int ok = 0; | |
499 | ||
500 | /* Try one GSSAPI method at a time, rather than sending them all at | |
501 | * once. */ | |
502 | ||
b0b30ca6 | 503 | if (gss_supported == NULL) |
504 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 505 | |
506 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 507 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 508 | if (gssctxt) |
509 | ssh_gssapi_delete_ctx(&gssctxt); | |
510 | ssh_gssapi_build_ctx(&gssctxt); | |
b0b30ca6 | 511 | ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]); |
7364bd04 | 512 | |
513 | /* My DER encoding requires length<128 */ | |
b0b30ca6 | 514 | if (gss_supported->elements[mech].length < 128 && |
7364bd04 | 515 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
516 | authctxt->host))) { | |
517 | ok = 1; /* Mechanism works */ | |
518 | } else { | |
519 | mech++; | |
520 | } | |
521 | } | |
522 | ||
18fc231c | 523 | if (!ok) { |
524 | ssh_gssapi_delete_ctx(&gssctxt); | |
2ceb8101 | 525 | return 0; |
18fc231c | 526 | } |
7364bd04 | 527 | |
528 | authctxt->methoddata=(void *)gssctxt; | |
529 | ||
530 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
531 | packet_put_cstring(authctxt->server_user); | |
532 | packet_put_cstring(authctxt->service); | |
533 | packet_put_cstring(authctxt->method->name); | |
534 | ||
535 | packet_put_int(1); | |
536 | ||
d8d9afd0 | 537 | packet_put_int((gss_supported->elements[mech].length) + 2); |
538 | packet_put_char(SSH_GSS_OIDTYPE); | |
539 | packet_put_char(gss_supported->elements[mech].length); | |
540 | packet_put_raw(gss_supported->elements[mech].elements, | |
541 | gss_supported->elements[mech].length); | |
7364bd04 | 542 | |
543 | packet_send(); | |
544 | ||
545 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
546 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
547 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
548 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
549 | ||
550 | mech++; /* Move along to next candidate */ | |
551 | ||
552 | return 1; | |
553 | } | |
554 | ||
b930668c | 555 | static OM_uint32 |
556 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
557 | { | |
558 | Authctxt *authctxt = ctxt; | |
559 | Gssctxt *gssctxt = authctxt->methoddata; | |
560 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 561 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
562 | gss_buffer_desc gssbuf; | |
0789992b | 563 | OM_uint32 status, ms, flags; |
564 | Buffer b; | |
b6453d99 | 565 | |
b930668c | 566 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 567 | recv_tok, &send_tok, &flags); |
b930668c | 568 | |
569 | if (send_tok.length > 0) { | |
570 | if (GSS_ERROR(status)) | |
571 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
572 | else | |
573 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 574 | |
b930668c | 575 | packet_put_string(send_tok.value, send_tok.length); |
576 | packet_send(); | |
577 | gss_release_buffer(&ms, &send_tok); | |
578 | } | |
b6453d99 | 579 | |
b930668c | 580 | if (status == GSS_S_COMPLETE) { |
0789992b | 581 | /* send either complete or MIC, depending on mechanism */ |
582 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
583 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
584 | packet_send(); | |
585 | } else { | |
586 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
587 | authctxt->service, "gssapi-with-mic"); | |
588 | ||
589 | gssbuf.value = buffer_ptr(&b); | |
590 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 591 | |
0789992b | 592 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 593 | |
0789992b | 594 | if (!GSS_ERROR(status)) { |
595 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
596 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 597 | |
0789992b | 598 | packet_send(); |
599 | } | |
b6453d99 | 600 | |
0789992b | 601 | buffer_free(&b); |
602 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 603 | } |
b930668c | 604 | } |
b6453d99 | 605 | |
b930668c | 606 | return status; |
607 | } | |
608 | ||
7364bd04 | 609 | void |
610 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
611 | { | |
612 | Authctxt *authctxt = ctxt; | |
613 | Gssctxt *gssctxt; | |
7364bd04 | 614 | int oidlen; |
615 | char *oidv; | |
7364bd04 | 616 | |
617 | if (authctxt == NULL) | |
618 | fatal("input_gssapi_response: no authentication context"); | |
619 | gssctxt = authctxt->methoddata; | |
620 | ||
621 | /* Setup our OID */ | |
622 | oidv = packet_get_string(&oidlen); | |
623 | ||
d8d9afd0 | 624 | if (oidlen <= 2 || |
625 | oidv[0] != SSH_GSS_OIDTYPE || | |
626 | oidv[1] != oidlen - 2) { | |
b930668c | 627 | xfree(oidv); |
d8d9afd0 | 628 | debug("Badly encoded mechanism OID received"); |
629 | userauth(authctxt, NULL); | |
d8d9afd0 | 630 | return; |
7364bd04 | 631 | } |
632 | ||
d8d9afd0 | 633 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
634 | fatal("Server returned different OID than expected"); | |
635 | ||
7364bd04 | 636 | packet_check_eom(); |
637 | ||
638 | xfree(oidv); | |
639 | ||
b930668c | 640 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 641 | /* Start again with next method on list */ |
642 | debug("Trying to start again"); | |
643 | userauth(authctxt, NULL); | |
644 | return; | |
645 | } | |
7364bd04 | 646 | } |
647 | ||
648 | void | |
649 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
650 | { | |
651 | Authctxt *authctxt = ctxt; | |
7364bd04 | 652 | gss_buffer_desc recv_tok; |
b930668c | 653 | OM_uint32 status; |
7364bd04 | 654 | u_int slen; |
655 | ||
656 | if (authctxt == NULL) | |
657 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 658 | |
659 | recv_tok.value = packet_get_string(&slen); | |
660 | recv_tok.length = slen; /* safe typecast */ | |
661 | ||
662 | packet_check_eom(); | |
663 | ||
b930668c | 664 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 665 | |
666 | xfree(recv_tok.value); | |
667 | ||
668 | if (GSS_ERROR(status)) { | |
7364bd04 | 669 | /* Start again with the next method in the list */ |
670 | userauth(authctxt, NULL); | |
671 | return; | |
672 | } | |
7364bd04 | 673 | } |
674 | ||
675 | void | |
676 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
677 | { | |
678 | Authctxt *authctxt = ctxt; | |
679 | Gssctxt *gssctxt; | |
680 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
681 | gss_buffer_desc recv_tok; | |
682 | OM_uint32 status, ms; | |
f99e1ca4 | 683 | u_int len; |
7364bd04 | 684 | |
685 | if (authctxt == NULL) | |
686 | fatal("input_gssapi_response: no authentication context"); | |
687 | gssctxt = authctxt->methoddata; | |
688 | ||
f99e1ca4 | 689 | recv_tok.value = packet_get_string(&len); |
690 | recv_tok.length = len; | |
7364bd04 | 691 | |
692 | packet_check_eom(); | |
693 | ||
694 | /* Stick it into GSSAPI and see what it says */ | |
695 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 696 | &recv_tok, &send_tok, NULL); |
7364bd04 | 697 | |
698 | xfree(recv_tok.value); | |
699 | gss_release_buffer(&ms, &send_tok); | |
700 | ||
701 | /* Server will be returning a failed packet after this one */ | |
702 | } | |
703 | ||
704 | void | |
705 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
706 | { | |
707 | OM_uint32 maj, min; | |
708 | char *msg; | |
709 | char *lang; | |
710 | ||
711 | maj=packet_get_int(); | |
712 | min=packet_get_int(); | |
713 | msg=packet_get_string(NULL); | |
714 | lang=packet_get_string(NULL); | |
715 | ||
716 | packet_check_eom(); | |
717 | ||
17318dd6 | 718 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 719 | xfree(msg); |
720 | xfree(lang); | |
721 | } | |
722 | #endif /* GSSAPI */ | |
723 | ||
94ec8c6b | 724 | int |
725 | userauth_none(Authctxt *authctxt) | |
726 | { | |
727 | /* initial userauth request */ | |
728 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
729 | packet_put_cstring(authctxt->server_user); | |
730 | packet_put_cstring(authctxt->service); | |
731 | packet_put_cstring(authctxt->method->name); | |
732 | packet_send(); | |
94ec8c6b | 733 | return 1; |
734 | } | |
735 | ||
a306f2dd | 736 | int |
188adeb2 | 737 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 738 | { |
1d1ffb87 | 739 | static int attempt = 0; |
67ec167d | 740 | char prompt[150]; |
a306f2dd | 741 | char *password; |
742 | ||
fa649821 | 743 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 744 | return 0; |
745 | ||
6aacefa7 | 746 | if (attempt != 1) |
fa649821 | 747 | error("Permission denied, please try again."); |
748 | ||
f72e01a5 | 749 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 750 | authctxt->server_user, authctxt->host); |
a306f2dd | 751 | password = read_passphrase(prompt, 0); |
752 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 753 | packet_put_cstring(authctxt->server_user); |
754 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 755 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 756 | packet_put_char(0); |
a6215e53 | 757 | packet_put_cstring(password); |
a306f2dd | 758 | memset(password, 0, strlen(password)); |
759 | xfree(password); | |
b4b701be | 760 | packet_add_padding(64); |
a306f2dd | 761 | packet_send(); |
67ec167d | 762 | |
7203d6bb | 763 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 764 | &input_userauth_passwd_changereq); |
765 | ||
a306f2dd | 766 | return 1; |
767 | } | |
67ec167d | 768 | /* |
769 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
770 | */ | |
771 | void | |
ef077e37 | 772 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 773 | { |
774 | Authctxt *authctxt = ctxt; | |
775 | char *info, *lang, *password = NULL, *retype = NULL; | |
776 | char prompt[150]; | |
777 | ||
778 | debug2("input_userauth_passwd_changereq"); | |
779 | ||
780 | if (authctxt == NULL) | |
781 | fatal("input_userauth_passwd_changereq: " | |
782 | "no authentication context"); | |
783 | ||
784 | info = packet_get_string(NULL); | |
785 | lang = packet_get_string(NULL); | |
786 | if (strlen(info) > 0) | |
bbe88b6d | 787 | logit("%s", info); |
67ec167d | 788 | xfree(info); |
789 | xfree(lang); | |
790 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
791 | packet_put_cstring(authctxt->server_user); | |
792 | packet_put_cstring(authctxt->service); | |
793 | packet_put_cstring(authctxt->method->name); | |
794 | packet_put_char(1); /* additional info */ | |
7203d6bb | 795 | snprintf(prompt, sizeof(prompt), |
67ec167d | 796 | "Enter %.30s@%.128s's old password: ", |
797 | authctxt->server_user, authctxt->host); | |
798 | password = read_passphrase(prompt, 0); | |
799 | packet_put_cstring(password); | |
800 | memset(password, 0, strlen(password)); | |
801 | xfree(password); | |
802 | password = NULL; | |
803 | while (password == NULL) { | |
7203d6bb | 804 | snprintf(prompt, sizeof(prompt), |
67ec167d | 805 | "Enter %.30s@%.128s's new password: ", |
806 | authctxt->server_user, authctxt->host); | |
807 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
808 | if (password == NULL) { | |
809 | /* bail out */ | |
810 | return; | |
811 | } | |
7203d6bb | 812 | snprintf(prompt, sizeof(prompt), |
67ec167d | 813 | "Retype %.30s@%.128s's new password: ", |
814 | authctxt->server_user, authctxt->host); | |
815 | retype = read_passphrase(prompt, 0); | |
816 | if (strcmp(password, retype) != 0) { | |
817 | memset(password, 0, strlen(password)); | |
818 | xfree(password); | |
bbe88b6d | 819 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 820 | password = NULL; |
821 | } | |
822 | memset(retype, 0, strlen(retype)); | |
823 | xfree(retype); | |
824 | } | |
825 | packet_put_cstring(password); | |
826 | memset(password, 0, strlen(password)); | |
827 | xfree(password); | |
828 | packet_add_padding(64); | |
829 | packet_send(); | |
7203d6bb | 830 | |
831 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 832 | &input_userauth_passwd_changereq); |
833 | } | |
a306f2dd | 834 | |
43348518 | 835 | static int |
836 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
837 | u_char *data, u_int datalen) | |
838 | { | |
839 | Key *prv; | |
840 | int ret; | |
841 | ||
842 | /* the agent supports this key */ | |
843 | if (id->ac) | |
844 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
845 | data, datalen)); | |
846 | /* | |
847 | * we have already loaded the private key or | |
848 | * the private key is stored in external hardware | |
849 | */ | |
850 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
851 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
852 | /* load the private key from the file */ | |
853 | if ((prv = load_identity_file(id->filename)) == NULL) | |
854 | return (-1); | |
855 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
856 | key_free(prv); | |
857 | return (ret); | |
fee56204 | 858 | } |
859 | ||
396c147e | 860 | static int |
43348518 | 861 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 862 | { |
863 | Buffer b; | |
1e3b8b07 | 864 | u_char *blob, *signature; |
c66f9d0e | 865 | u_int bloblen, slen; |
a27002e5 | 866 | u_int skip = 0; |
2e73a022 | 867 | int ret = -1; |
94ec8c6b | 868 | int have_sig = 1; |
a306f2dd | 869 | |
cbc5abf9 | 870 | debug3("sign_and_send_pubkey"); |
fee56204 | 871 | |
43348518 | 872 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 873 | /* we cannot handle this key */ |
cbc5abf9 | 874 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 875 | return 0; |
876 | } | |
a306f2dd | 877 | /* data to be signed */ |
878 | buffer_init(&b); | |
33de75a3 | 879 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 880 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 881 | skip = session_id2_len; |
33de75a3 | 882 | } else { |
883 | buffer_put_string(&b, session_id2, session_id2_len); | |
884 | skip = buffer_len(&b); | |
74fc9186 | 885 | } |
a306f2dd | 886 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 887 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 888 | buffer_put_cstring(&b, |
cbc5abf9 | 889 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 890 | "ssh-userauth" : |
188adeb2 | 891 | authctxt->service); |
cbc5abf9 | 892 | if (datafellows & SSH_BUG_PKAUTH) { |
893 | buffer_put_char(&b, have_sig); | |
894 | } else { | |
895 | buffer_put_cstring(&b, authctxt->method->name); | |
896 | buffer_put_char(&b, have_sig); | |
43348518 | 897 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 898 | } |
a306f2dd | 899 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 900 | |
901 | /* generate signature */ | |
43348518 | 902 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 903 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 904 | if (ret == -1) { |
905 | xfree(blob); | |
906 | buffer_free(&b); | |
907 | return 0; | |
908 | } | |
fa08c86b | 909 | #ifdef DEBUG_PK |
a306f2dd | 910 | buffer_dump(&b); |
911 | #endif | |
cbc5abf9 | 912 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 913 | buffer_clear(&b); |
914 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 915 | skip = session_id2_len; |
d0c832f3 | 916 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 917 | buffer_put_cstring(&b, authctxt->server_user); |
918 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 919 | buffer_put_cstring(&b, authctxt->method->name); |
920 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 921 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 922 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 923 | buffer_put_string(&b, blob, bloblen); |
924 | } | |
925 | xfree(blob); | |
fee56204 | 926 | |
a306f2dd | 927 | /* append signature */ |
928 | buffer_put_string(&b, signature, slen); | |
929 | xfree(signature); | |
930 | ||
931 | /* skip session id and packet type */ | |
74fc9186 | 932 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 933 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 934 | buffer_consume(&b, skip + 1); |
a306f2dd | 935 | |
936 | /* put remaining data from buffer into packet */ | |
937 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
938 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
939 | buffer_free(&b); | |
a306f2dd | 940 | packet_send(); |
2e73a022 | 941 | |
942 | return 1; | |
4c8722d9 | 943 | } |
944 | ||
396c147e | 945 | static int |
43348518 | 946 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 947 | { |
fee56204 | 948 | u_char *blob; |
21b30f38 | 949 | u_int bloblen, have_sig = 0; |
4c8722d9 | 950 | |
fee56204 | 951 | debug3("send_pubkey_test"); |
952 | ||
43348518 | 953 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 954 | /* we cannot handle this key */ |
955 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 956 | return 0; |
957 | } | |
fee56204 | 958 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 959 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 960 | |
fee56204 | 961 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
962 | packet_put_cstring(authctxt->server_user); | |
963 | packet_put_cstring(authctxt->service); | |
964 | packet_put_cstring(authctxt->method->name); | |
965 | packet_put_char(have_sig); | |
966 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 967 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 968 | packet_put_string(blob, bloblen); |
969 | xfree(blob); | |
970 | packet_send(); | |
971 | return 1; | |
972 | } | |
973 | ||
396c147e | 974 | static Key * |
fee56204 | 975 | load_identity_file(char *filename) |
976 | { | |
977 | Key *private; | |
978 | char prompt[300], *passphrase; | |
fc231518 | 979 | int perm_ok, quit, i; |
d156519a | 980 | struct stat st; |
fee56204 | 981 | |
d156519a | 982 | if (stat(filename, &st) < 0) { |
983 | debug3("no such identity: %s", filename); | |
984 | return NULL; | |
985 | } | |
fc231518 | 986 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
987 | if (!perm_ok) | |
988 | return NULL; | |
aeaa3d9e | 989 | if (private == NULL) { |
990 | if (options.batch_mode) | |
fee56204 | 991 | return NULL; |
4c8722d9 | 992 | snprintf(prompt, sizeof prompt, |
184eed6a | 993 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 994 | for (i = 0; i < options.number_of_password_prompts; i++) { |
995 | passphrase = read_passphrase(prompt, 0); | |
996 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 997 | private = key_load_private_type(KEY_UNSPEC, |
998 | filename, passphrase, NULL, NULL); | |
fee56204 | 999 | quit = 0; |
188adeb2 | 1000 | } else { |
1001 | debug2("no passphrase given, try next key"); | |
fee56204 | 1002 | quit = 1; |
188adeb2 | 1003 | } |
1004 | memset(passphrase, 0, strlen(passphrase)); | |
1005 | xfree(passphrase); | |
aeaa3d9e | 1006 | if (private != NULL || quit) |
188adeb2 | 1007 | break; |
1008 | debug2("bad passphrase given, try again..."); | |
1009 | } | |
4c8722d9 | 1010 | } |
fee56204 | 1011 | return private; |
1012 | } | |
1013 | ||
43348518 | 1014 | /* |
1015 | * try keys in the following order: | |
1016 | * 1. agent keys that are found in the config file | |
1017 | * 2. other agent keys | |
1018 | * 3. keys that are only listed in the config file | |
1019 | */ | |
1020 | static void | |
1021 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1022 | { |
43348518 | 1023 | Identity *id; |
1024 | Idlist agent, files, *preferred; | |
1025 | Key *key; | |
1026 | AuthenticationConnection *ac; | |
1027 | char *comment; | |
1028 | int i, found; | |
1029 | ||
1030 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1031 | TAILQ_INIT(&files); /* keys from the config file */ | |
1032 | preferred = &authctxt->keys; | |
1033 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1034 | ||
1035 | /* list of keys stored in the filesystem */ | |
1036 | for (i = 0; i < options.num_identity_files; i++) { | |
1037 | key = options.identity_keys[i]; | |
1038 | if (key && key->type == KEY_RSA1) | |
1039 | continue; | |
1040 | options.identity_keys[i] = NULL; | |
52e3daed | 1041 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1042 | id->key = key; |
1043 | id->filename = xstrdup(options.identity_files[i]); | |
1044 | TAILQ_INSERT_TAIL(&files, id, next); | |
1045 | } | |
1046 | /* list of keys supported by the agent */ | |
1047 | if ((ac = ssh_get_authentication_connection())) { | |
1048 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1049 | key != NULL; | |
1050 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1051 | found = 0; | |
1052 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1053 | /* agent keys from the config file are preferred */ |
43348518 | 1054 | if (key_equal(key, id->key)) { |
1055 | key_free(key); | |
1056 | xfree(comment); | |
1057 | TAILQ_REMOVE(&files, id, next); | |
1058 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1059 | id->ac = ac; | |
1060 | found = 1; | |
1061 | break; | |
1062 | } | |
1063 | } | |
3a065ed0 | 1064 | if (!found && !options.identities_only) { |
52e3daed | 1065 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1066 | id->key = key; |
1067 | id->filename = comment; | |
1068 | id->ac = ac; | |
1069 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1070 | } | |
1071 | } | |
1072 | /* append remaining agent keys */ | |
1073 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1074 | TAILQ_REMOVE(&agent, id, next); | |
1075 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1076 | } | |
1077 | authctxt->agent = ac; | |
1078 | } | |
1079 | /* append remaining keys from the config file */ | |
1080 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1081 | TAILQ_REMOVE(&files, id, next); | |
1082 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1083 | } | |
1084 | TAILQ_FOREACH(id, preferred, next) { | |
1085 | debug2("key: %s (%p)", id->filename, id->key); | |
1086 | } | |
fee56204 | 1087 | } |
1088 | ||
43348518 | 1089 | static void |
1090 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1091 | { |
43348518 | 1092 | Identity *id; |
1093 | ||
1094 | if (authctxt->agent != NULL) | |
1095 | ssh_close_authentication_connection(authctxt->agent); | |
1096 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1097 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1098 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1099 | if (id->key) | |
1100 | key_free(id->key); | |
1101 | if (id->filename) | |
1102 | xfree(id->filename); | |
1103 | xfree(id); | |
2e73a022 | 1104 | } |
a306f2dd | 1105 | } |
1106 | ||
188adeb2 | 1107 | int |
1108 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1109 | { |
43348518 | 1110 | Identity *id; |
188adeb2 | 1111 | int sent = 0; |
1112 | ||
43348518 | 1113 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1114 | if (id->tried++) | |
1115 | return (0); | |
b56e99e2 | 1116 | /* move key to the end of the queue */ |
43348518 | 1117 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1118 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1119 | /* | |
1120 | * send a test message if we have the public key. for | |
1121 | * encrypted keys we cannot do this and have to load the | |
1122 | * private key instead | |
1123 | */ | |
1124 | if (id->key && id->key->type != KEY_RSA1) { | |
1125 | debug("Offering public key: %s", id->filename); | |
1126 | sent = send_pubkey_test(authctxt, id); | |
1127 | } else if (id->key == NULL) { | |
1128 | debug("Trying private key: %s", id->filename); | |
1129 | id->key = load_identity_file(id->filename); | |
1130 | if (id->key != NULL) { | |
1131 | id->isprivate = 1; | |
1132 | sent = sign_and_send_pubkey(authctxt, id); | |
1133 | key_free(id->key); | |
1134 | id->key = NULL; | |
fee56204 | 1135 | } |
fee56204 | 1136 | } |
43348518 | 1137 | if (sent) |
1138 | return (sent); | |
fa08c86b | 1139 | } |
43348518 | 1140 | return (0); |
188adeb2 | 1141 | } |
a306f2dd | 1142 | |
94ec8c6b | 1143 | /* |
1144 | * Send userauth request message specifying keyboard-interactive method. | |
1145 | */ | |
1146 | int | |
1147 | userauth_kbdint(Authctxt *authctxt) | |
1148 | { | |
1149 | static int attempt = 0; | |
1150 | ||
1151 | if (attempt++ >= options.number_of_password_prompts) | |
1152 | return 0; | |
6b759005 | 1153 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1154 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1155 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1156 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1157 | return 0; | |
1158 | } | |
94ec8c6b | 1159 | |
1160 | debug2("userauth_kbdint"); | |
1161 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1162 | packet_put_cstring(authctxt->server_user); | |
1163 | packet_put_cstring(authctxt->service); | |
1164 | packet_put_cstring(authctxt->method->name); | |
1165 | packet_put_cstring(""); /* lang */ | |
1166 | packet_put_cstring(options.kbd_interactive_devices ? | |
1167 | options.kbd_interactive_devices : ""); | |
1168 | packet_send(); | |
94ec8c6b | 1169 | |
1170 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1171 | return 1; | |
1172 | } | |
1173 | ||
1174 | /* | |
f72e01a5 | 1175 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1176 | */ |
1177 | void | |
7819b5c3 | 1178 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1179 | { |
1180 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1181 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1182 | u_int num_prompts, i; |
94ec8c6b | 1183 | int echo = 0; |
1184 | ||
1185 | debug2("input_userauth_info_req"); | |
1186 | ||
1187 | if (authctxt == NULL) | |
1188 | fatal("input_userauth_info_req: no authentication context"); | |
1189 | ||
6b759005 | 1190 | authctxt->info_req_seen = 1; |
1191 | ||
94ec8c6b | 1192 | name = packet_get_string(NULL); |
1193 | inst = packet_get_string(NULL); | |
1194 | lang = packet_get_string(NULL); | |
94ec8c6b | 1195 | if (strlen(name) > 0) |
bbe88b6d | 1196 | logit("%s", name); |
94ec8c6b | 1197 | if (strlen(inst) > 0) |
bbe88b6d | 1198 | logit("%s", inst); |
f72e01a5 | 1199 | xfree(name); |
94ec8c6b | 1200 | xfree(inst); |
f72e01a5 | 1201 | xfree(lang); |
94ec8c6b | 1202 | |
1203 | num_prompts = packet_get_int(); | |
1204 | /* | |
1205 | * Begin to build info response packet based on prompts requested. | |
1206 | * We commit to providing the correct number of responses, so if | |
1207 | * further on we run into a problem that prevents this, we have to | |
1208 | * be sure and clean this up and send a correct error response. | |
1209 | */ | |
1210 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1211 | packet_put_int(num_prompts); | |
1212 | ||
5ba55ada | 1213 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1214 | for (i = 0; i < num_prompts; i++) { |
1215 | prompt = packet_get_string(NULL); | |
1216 | echo = packet_get_char(); | |
1217 | ||
1843a425 | 1218 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1219 | |
a6215e53 | 1220 | packet_put_cstring(response); |
94ec8c6b | 1221 | memset(response, 0, strlen(response)); |
1222 | xfree(response); | |
1223 | xfree(prompt); | |
1224 | } | |
95500969 | 1225 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1226 | |
b4b701be | 1227 | packet_add_padding(64); |
94ec8c6b | 1228 | packet_send(); |
94ec8c6b | 1229 | } |
a306f2dd | 1230 | |
39c00dc2 | 1231 | static int |
d6133f43 | 1232 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1233 | u_char *data, u_int datalen) |
1234 | { | |
1235 | Buffer b; | |
7091a26b | 1236 | struct stat st; |
39c00dc2 | 1237 | pid_t pid; |
d4826734 | 1238 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1239 | |
6226a8f8 | 1240 | debug2("ssh_keysign called"); |
39c00dc2 | 1241 | |
7091a26b | 1242 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1243 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1244 | return -1; | |
1245 | } | |
39c00dc2 | 1246 | if (fflush(stdout) != 0) |
1247 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1248 | if (pipe(to) < 0) { | |
1249 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1250 | return -1; | |
1251 | } | |
1252 | if (pipe(from) < 0) { | |
1253 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1254 | return -1; | |
1255 | } | |
1256 | if ((pid = fork()) < 0) { | |
1257 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1258 | return -1; | |
1259 | } | |
1260 | if (pid == 0) { | |
3c33c1b6 | 1261 | permanently_drop_suid(getuid()); |
39c00dc2 | 1262 | close(from[0]); |
1263 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1264 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1265 | close(to[1]); | |
1266 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1267 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1268 | close(from[1]); |
1269 | close(to[0]); | |
a3f69458 | 1270 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1271 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1272 | strerror(errno)); | |
1273 | } | |
1274 | close(from[1]); | |
1275 | close(to[0]); | |
1276 | ||
1277 | buffer_init(&b); | |
d4826734 | 1278 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1279 | buffer_put_string(&b, data, datalen); |
d3cbe6f8 | 1280 | if (ssh_msg_send(to[1], version, &b) == -1) |
1281 | fatal("ssh_keysign: couldn't send request"); | |
39c00dc2 | 1282 | |
e987fdbe | 1283 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1284 | error("ssh_keysign: no reply"); |
43f7a4b8 | 1285 | buffer_free(&b); |
39c00dc2 | 1286 | return -1; |
1287 | } | |
39c00dc2 | 1288 | close(from[0]); |
1289 | close(to[1]); | |
1290 | ||
d4826734 | 1291 | while (waitpid(pid, &status, 0) < 0) |
1292 | if (errno != EINTR) | |
1293 | break; | |
39c00dc2 | 1294 | |
7091a26b | 1295 | if (buffer_get_char(&b) != version) { |
1296 | error("ssh_keysign: bad version"); | |
43f7a4b8 | 1297 | buffer_free(&b); |
7091a26b | 1298 | return -1; |
1299 | } | |
1300 | *sigp = buffer_get_string(&b, lenp); | |
43f7a4b8 | 1301 | buffer_free(&b); |
7091a26b | 1302 | |
39c00dc2 | 1303 | return 0; |
1304 | } | |
1305 | ||
8002af61 | 1306 | int |
1307 | userauth_hostbased(Authctxt *authctxt) | |
1308 | { | |
1309 | Key *private = NULL; | |
39c00dc2 | 1310 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1311 | Buffer b; |
1312 | u_char *signature, *blob; | |
1313 | char *chost, *pkalg, *p; | |
8dddf799 | 1314 | const char *service; |
8002af61 | 1315 | u_int blen, slen; |
f98c3421 | 1316 | int ok, i, len, found = 0; |
8002af61 | 1317 | |
8002af61 | 1318 | /* check for a useful key */ |
39c00dc2 | 1319 | for (i = 0; i < sensitive->nkeys; i++) { |
1320 | private = sensitive->keys[i]; | |
8002af61 | 1321 | if (private && private->type != KEY_RSA1) { |
1322 | found = 1; | |
1323 | /* we take and free the key */ | |
39c00dc2 | 1324 | sensitive->keys[i] = NULL; |
8002af61 | 1325 | break; |
1326 | } | |
1327 | } | |
1328 | if (!found) { | |
6226a8f8 | 1329 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1330 | return 0; |
1331 | } | |
1332 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1333 | key_free(private); | |
8002af61 | 1334 | return 0; |
1335 | } | |
e8d59b4d | 1336 | /* figure out a name for the client host */ |
1337 | p = get_local_name(packet_get_connection_in()); | |
1338 | if (p == NULL) { | |
1339 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1340 | key_free(private); | |
18fc231c | 1341 | xfree(blob); |
e8d59b4d | 1342 | return 0; |
1343 | } | |
1344 | len = strlen(p) + 2; | |
52e3daed | 1345 | xasprintf(&chost, "%s.", p); |
e8d59b4d | 1346 | debug2("userauth_hostbased: chost %s", chost); |
3e2f2431 | 1347 | xfree(p); |
e8d59b4d | 1348 | |
8dddf799 | 1349 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1350 | authctxt->service; | |
8002af61 | 1351 | pkalg = xstrdup(key_ssh_name(private)); |
1352 | buffer_init(&b); | |
8002af61 | 1353 | /* construct data */ |
8dddf799 | 1354 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1355 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1356 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1357 | buffer_put_cstring(&b, service); |
8002af61 | 1358 | buffer_put_cstring(&b, authctxt->method->name); |
1359 | buffer_put_cstring(&b, pkalg); | |
1360 | buffer_put_string(&b, blob, blen); | |
1361 | buffer_put_cstring(&b, chost); | |
1362 | buffer_put_cstring(&b, authctxt->local_user); | |
1363 | #ifdef DEBUG_PK | |
1364 | buffer_dump(&b); | |
1365 | #endif | |
39c00dc2 | 1366 | if (sensitive->external_keysign) |
1367 | ok = ssh_keysign(private, &signature, &slen, | |
1368 | buffer_ptr(&b), buffer_len(&b)); | |
1369 | else | |
1370 | ok = key_sign(private, &signature, &slen, | |
1371 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1372 | key_free(private); |
1373 | buffer_free(&b); | |
1374 | if (ok != 0) { | |
1375 | error("key_sign failed"); | |
1376 | xfree(chost); | |
1377 | xfree(pkalg); | |
18fc231c | 1378 | xfree(blob); |
8002af61 | 1379 | return 0; |
1380 | } | |
1381 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1382 | packet_put_cstring(authctxt->server_user); | |
1383 | packet_put_cstring(authctxt->service); | |
1384 | packet_put_cstring(authctxt->method->name); | |
1385 | packet_put_cstring(pkalg); | |
1386 | packet_put_string(blob, blen); | |
1387 | packet_put_cstring(chost); | |
1388 | packet_put_cstring(authctxt->local_user); | |
1389 | packet_put_string(signature, slen); | |
1390 | memset(signature, 's', slen); | |
1391 | xfree(signature); | |
1392 | xfree(chost); | |
1393 | xfree(pkalg); | |
18fc231c | 1394 | xfree(blob); |
8002af61 | 1395 | |
1396 | packet_send(); | |
1397 | return 1; | |
1398 | } | |
1399 | ||
188adeb2 | 1400 | /* find auth method */ |
1401 | ||
188adeb2 | 1402 | /* |
1403 | * given auth method name, if configurable options permit this method fill | |
1404 | * in auth_ident field and return true, otherwise return false. | |
1405 | */ | |
396c147e | 1406 | static int |
188adeb2 | 1407 | authmethod_is_enabled(Authmethod *method) |
1408 | { | |
1409 | if (method == NULL) | |
1410 | return 0; | |
1411 | /* return false if options indicate this method is disabled */ | |
1412 | if (method->enabled == NULL || *method->enabled == 0) | |
1413 | return 0; | |
1414 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1415 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1416 | return 0; | |
1417 | return 1; | |
1418 | } | |
a306f2dd | 1419 | |
396c147e | 1420 | static Authmethod * |
188adeb2 | 1421 | authmethod_lookup(const char *name) |
1422 | { | |
1423 | Authmethod *method = NULL; | |
1424 | if (name != NULL) | |
1425 | for (method = authmethods; method->name != NULL; method++) | |
1426 | if (strcmp(name, method->name) == 0) | |
1427 | return method; | |
1428 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1429 | return NULL; | |
1430 | } | |
1431 | ||
cab80f75 | 1432 | /* XXX internal state */ |
1433 | static Authmethod *current = NULL; | |
1434 | static char *supported = NULL; | |
1435 | static char *preferred = NULL; | |
d6133f43 | 1436 | |
188adeb2 | 1437 | /* |
1438 | * Given the authentication method list sent by the server, return the | |
1439 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1440 | * use a built-in default list. |
2b87da3b | 1441 | */ |
396c147e | 1442 | static Authmethod * |
188adeb2 | 1443 | authmethod_get(char *authlist) |
1444 | { | |
cab80f75 | 1445 | char *name = NULL; |
21b30f38 | 1446 | u_int next; |
2b87da3b | 1447 | |
188adeb2 | 1448 | /* Use a suitable default if we're passed a nil list. */ |
1449 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1450 | authlist = options.preferred_authentications; |
1451 | ||
1452 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1453 | debug3("start over, passed a different list %s", authlist); | |
1454 | if (supported != NULL) | |
1455 | xfree(supported); | |
1456 | supported = xstrdup(authlist); | |
1457 | preferred = options.preferred_authentications; | |
1458 | debug3("preferred %s", preferred); | |
1459 | current = NULL; | |
1460 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1461 | return current; | |
188adeb2 | 1462 | |
cab80f75 | 1463 | for (;;) { |
1464 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1465 | debug("No more authentication methods to try."); |
cab80f75 | 1466 | current = NULL; |
1467 | return NULL; | |
1468 | } | |
1469 | preferred += next; | |
94ec8c6b | 1470 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1471 | debug3("remaining preferred: %s", preferred); |
1472 | if ((current = authmethod_lookup(name)) != NULL && | |
1473 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1474 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1475 | debug("Next authentication method: %s", name); |
cab80f75 | 1476 | return current; |
94ec8c6b | 1477 | } |
a306f2dd | 1478 | } |
cab80f75 | 1479 | } |
a22aff1f | 1480 | |
ffb215be | 1481 | static char * |
cab80f75 | 1482 | authmethods_get(void) |
1483 | { | |
1484 | Authmethod *method = NULL; | |
3469eac4 | 1485 | Buffer b; |
1486 | char *list; | |
cab80f75 | 1487 | |
3469eac4 | 1488 | buffer_init(&b); |
cab80f75 | 1489 | for (method = authmethods; method->name != NULL; method++) { |
1490 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1491 | if (buffer_len(&b) > 0) |
1492 | buffer_append(&b, ",", 1); | |
1493 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1494 | } |
1495 | } | |
3469eac4 | 1496 | buffer_append(&b, "\0", 1); |
1497 | list = xstrdup(buffer_ptr(&b)); | |
1498 | buffer_free(&b); | |
1499 | return list; | |
a306f2dd | 1500 | } |