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31652869 | 1 | /* $OpenBSD: sshconnect2.c,v 1.160 2006/08/03 03:34:42 deraadt 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> |
31652869 | 29 | #include <sys/socket.h> |
aa2eae64 | 30 | #include <sys/wait.h> |
4095f623 | 31 | #include <sys/stat.h> |
a306f2dd | 32 | |
028094f4 | 33 | #include <errno.h> |
31652869 | 34 | #include <pwd.h> |
35 | #include <signal.h> | |
cf851879 | 36 | #include <stdio.h> |
00146caa | 37 | #include <string.h> |
67514848 | 38 | #include <unistd.h> |
028094f4 | 39 | |
751092f9 | 40 | #include "openbsd-compat/sys-queue.h" |
41 | ||
31652869 | 42 | #include "xmalloc.h" |
a306f2dd | 43 | #include "ssh.h" |
42f11eb2 | 44 | #include "ssh2.h" |
a306f2dd | 45 | #include "buffer.h" |
46 | #include "packet.h" | |
a306f2dd | 47 | #include "compat.h" |
42f11eb2 | 48 | #include "cipher.h" |
31652869 | 49 | #include "key.h" |
a306f2dd | 50 | #include "kex.h" |
51 | #include "myproposal.h" | |
a306f2dd | 52 | #include "sshconnect.h" |
53 | #include "authfile.h" | |
db1cd2f3 | 54 | #include "dh.h" |
2e73a022 | 55 | #include "authfd.h" |
42f11eb2 | 56 | #include "log.h" |
57 | #include "readconf.h" | |
58ae9cb8 | 58 | #include "misc.h" |
cab80f75 | 59 | #include "match.h" |
a5c9ffdb | 60 | #include "dispatch.h" |
8002af61 | 61 | #include "canohost.h" |
39c00dc2 | 62 | #include "msg.h" |
63 | #include "pathnames.h" | |
82aeee5d | 64 | #include "uidswap.h" |
94ec8c6b | 65 | |
7364bd04 | 66 | #ifdef GSSAPI |
67 | #include "ssh-gss.h" | |
68 | #endif | |
69 | ||
a306f2dd | 70 | /* import */ |
71 | extern char *client_version_string; | |
72 | extern char *server_version_string; | |
73 | extern Options options; | |
74 | ||
75 | /* | |
76 | * SSH2 key exchange | |
77 | */ | |
78 | ||
1e3b8b07 | 79 | u_char *session_id2 = NULL; |
a27002e5 | 80 | u_int session_id2_len = 0; |
a306f2dd | 81 | |
a5c9ffdb | 82 | char *xxx_host; |
83 | struct sockaddr *xxx_hostaddr; | |
84 | ||
e092ce67 | 85 | Kex *xxx_kex = NULL; |
86 | ||
396c147e | 87 | static int |
f49bc4f7 | 88 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 89 | { |
f49bc4f7 | 90 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 91 | fatal("Host key verification failed."); |
a5c9ffdb | 92 | return 0; |
93 | } | |
94 | ||
a306f2dd | 95 | void |
94ec8c6b | 96 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
97 | { | |
94ec8c6b | 98 | Kex *kex; |
a5c9ffdb | 99 | |
100 | xxx_host = host; | |
101 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 102 | |
c523303b | 103 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 104 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 105 | options.ciphers = NULL; |
94ec8c6b | 106 | } |
107 | if (options.ciphers != NULL) { | |
108 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
109 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
110 | } | |
1ad64a93 | 111 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
112 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
113 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
114 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 115 | if (options.compression) { |
b2552997 | 116 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 117 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 118 | } else { |
b2552997 | 119 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 120 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 121 | } |
b2552997 | 122 | if (options.macs != NULL) { |
123 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
124 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
125 | } | |
e961a8f9 | 126 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 127 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 128 | options.hostkeyalgorithms; |
94ec8c6b | 129 | |
ffd7b36b | 130 | if (options.rekey_limit) |
131 | packet_set_rekey_limit(options.rekey_limit); | |
132 | ||
7a37c112 | 133 | /* start key exchange */ |
d8ee838b | 134 | kex = kex_setup(myproposal); |
98a58eda | 135 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 136 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 137 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 138 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 139 | kex->client_version_string=client_version_string; |
140 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 141 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 142 | |
e092ce67 | 143 | xxx_kex = kex; |
144 | ||
c422989b | 145 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 146 | |
d1ac6175 | 147 | session_id2 = kex->session_id; |
148 | session_id2_len = kex->session_id_len; | |
149 | ||
94ec8c6b | 150 | #ifdef DEBUG_KEXDH |
151 | /* send 1st encrypted/maced/compressed message */ | |
152 | packet_start(SSH2_MSG_IGNORE); | |
153 | packet_put_cstring("markus"); | |
154 | packet_send(); | |
155 | packet_write_wait(); | |
156 | #endif | |
a306f2dd | 157 | } |
71276795 | 158 | |
a306f2dd | 159 | /* |
160 | * Authenticate user | |
161 | */ | |
188adeb2 | 162 | |
163 | typedef struct Authctxt Authctxt; | |
164 | typedef struct Authmethod Authmethod; | |
43348518 | 165 | typedef struct identity Identity; |
166 | typedef struct idlist Idlist; | |
167 | ||
168 | struct identity { | |
169 | TAILQ_ENTRY(identity) next; | |
170 | AuthenticationConnection *ac; /* set if agent supports key */ | |
171 | Key *key; /* public/private key */ | |
172 | char *filename; /* comment for agent-only keys */ | |
173 | int tried; | |
174 | int isprivate; /* key points to the private key */ | |
175 | }; | |
176 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 177 | |
178 | struct Authctxt { | |
179 | const char *server_user; | |
8002af61 | 180 | const char *local_user; |
188adeb2 | 181 | const char *host; |
182 | const char *service; | |
188adeb2 | 183 | Authmethod *method; |
94ec8c6b | 184 | int success; |
fee56204 | 185 | char *authlist; |
8002af61 | 186 | /* pubkey */ |
43348518 | 187 | Idlist keys; |
8002af61 | 188 | AuthenticationConnection *agent; |
189 | /* hostbased */ | |
39c00dc2 | 190 | Sensitive *sensitive; |
6b759005 | 191 | /* kbd-interactive */ |
192 | int info_req_seen; | |
7364bd04 | 193 | /* generic */ |
194 | void *methoddata; | |
188adeb2 | 195 | }; |
196 | struct Authmethod { | |
197 | char *name; /* string to compare against server's list */ | |
198 | int (*userauth)(Authctxt *authctxt); | |
199 | int *enabled; /* flag in option struct that enables method */ | |
200 | int *batch_flag; /* flag in option struct that disables method */ | |
201 | }; | |
202 | ||
7819b5c3 | 203 | void input_userauth_success(int, u_int32_t, void *); |
204 | void input_userauth_failure(int, u_int32_t, void *); | |
205 | void input_userauth_banner(int, u_int32_t, void *); | |
206 | void input_userauth_error(int, u_int32_t, void *); | |
207 | void input_userauth_info_req(int, u_int32_t, void *); | |
208 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 209 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 210 | |
d5bb9418 | 211 | int userauth_none(Authctxt *); |
212 | int userauth_pubkey(Authctxt *); | |
213 | int userauth_passwd(Authctxt *); | |
214 | int userauth_kbdint(Authctxt *); | |
215 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 216 | int userauth_kerberos(Authctxt *); |
188adeb2 | 217 | |
7364bd04 | 218 | #ifdef GSSAPI |
219 | int userauth_gssapi(Authctxt *authctxt); | |
220 | void input_gssapi_response(int type, u_int32_t, void *); | |
221 | void input_gssapi_token(int type, u_int32_t, void *); | |
222 | void input_gssapi_hash(int type, u_int32_t, void *); | |
223 | void input_gssapi_error(int, u_int32_t, void *); | |
224 | void input_gssapi_errtok(int, u_int32_t, void *); | |
225 | #endif | |
226 | ||
d5bb9418 | 227 | void userauth(Authctxt *, char *); |
fee56204 | 228 | |
43348518 | 229 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 230 | static void pubkey_prepare(Authctxt *); |
231 | static void pubkey_cleanup(Authctxt *); | |
232 | static Key *load_identity_file(char *); | |
fee56204 | 233 | |
396c147e | 234 | static Authmethod *authmethod_get(char *authlist); |
235 | static Authmethod *authmethod_lookup(const char *name); | |
236 | static char *authmethods_get(void); | |
188adeb2 | 237 | |
238 | Authmethod authmethods[] = { | |
7364bd04 | 239 | #ifdef GSSAPI |
0789992b | 240 | {"gssapi-with-mic", |
7364bd04 | 241 | userauth_gssapi, |
242 | &options.gss_authentication, | |
243 | NULL}, | |
244 | #endif | |
3398dda9 | 245 | {"hostbased", |
246 | userauth_hostbased, | |
247 | &options.hostbased_authentication, | |
248 | NULL}, | |
9f37c0af | 249 | {"publickey", |
250 | userauth_pubkey, | |
251 | &options.pubkey_authentication, | |
252 | NULL}, | |
94ec8c6b | 253 | {"keyboard-interactive", |
254 | userauth_kbdint, | |
255 | &options.kbd_interactive_authentication, | |
256 | &options.batch_mode}, | |
9f37c0af | 257 | {"password", |
258 | userauth_passwd, | |
259 | &options.password_authentication, | |
260 | &options.batch_mode}, | |
94ec8c6b | 261 | {"none", |
262 | userauth_none, | |
263 | NULL, | |
264 | NULL}, | |
188adeb2 | 265 | {NULL, NULL, NULL, NULL} |
266 | }; | |
267 | ||
268 | void | |
8002af61 | 269 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 270 | Sensitive *sensitive) |
188adeb2 | 271 | { |
272 | Authctxt authctxt; | |
273 | int type; | |
188adeb2 | 274 | |
5ba55ada | 275 | if (options.challenge_response_authentication) |
d464095c | 276 | options.kbd_interactive_authentication = 1; |
277 | ||
188adeb2 | 278 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
279 | packet_put_cstring("ssh-userauth"); | |
280 | packet_send(); | |
a77673cc | 281 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 282 | packet_write_wait(); |
54a5250f | 283 | type = packet_read(); |
a77673cc | 284 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
285 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 286 | if (packet_remaining() > 0) { |
54a5250f | 287 | char *reply = packet_get_string(NULL); |
a77673cc | 288 | debug2("service_accept: %s", reply); |
188adeb2 | 289 | xfree(reply); |
188adeb2 | 290 | } else { |
6226a8f8 | 291 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 292 | } |
95500969 | 293 | packet_check_eom(); |
a77673cc | 294 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 295 | |
cab80f75 | 296 | if (options.preferred_authentications == NULL) |
297 | options.preferred_authentications = authmethods_get(); | |
298 | ||
188adeb2 | 299 | /* setup authentication context */ |
6b759005 | 300 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 301 | pubkey_prepare(&authctxt); |
188adeb2 | 302 | authctxt.server_user = server_user; |
8002af61 | 303 | authctxt.local_user = local_user; |
188adeb2 | 304 | authctxt.host = host; |
305 | authctxt.service = "ssh-connection"; /* service name */ | |
306 | authctxt.success = 0; | |
94ec8c6b | 307 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 308 | authctxt.authlist = NULL; |
7364bd04 | 309 | authctxt.methoddata = NULL; |
39c00dc2 | 310 | authctxt.sensitive = sensitive; |
6b759005 | 311 | authctxt.info_req_seen = 0; |
94ec8c6b | 312 | if (authctxt.method == NULL) |
313 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 314 | |
315 | /* initial userauth request */ | |
94ec8c6b | 316 | userauth_none(&authctxt); |
188adeb2 | 317 | |
7a37c112 | 318 | dispatch_init(&input_userauth_error); |
188adeb2 | 319 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
320 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 321 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 322 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
323 | ||
43348518 | 324 | pubkey_cleanup(&authctxt); |
b8c2031b | 325 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
326 | ||
6226a8f8 | 327 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 328 | } |
b8c2031b | 329 | |
188adeb2 | 330 | void |
fee56204 | 331 | userauth(Authctxt *authctxt, char *authlist) |
332 | { | |
7364bd04 | 333 | if (authctxt->methoddata) { |
334 | xfree(authctxt->methoddata); | |
335 | authctxt->methoddata = NULL; | |
336 | } | |
fee56204 | 337 | if (authlist == NULL) { |
338 | authlist = authctxt->authlist; | |
339 | } else { | |
340 | if (authctxt->authlist) | |
341 | xfree(authctxt->authlist); | |
342 | authctxt->authlist = authlist; | |
343 | } | |
344 | for (;;) { | |
345 | Authmethod *method = authmethod_get(authlist); | |
346 | if (method == NULL) | |
347 | fatal("Permission denied (%s).", authlist); | |
348 | authctxt->method = method; | |
b8c2031b | 349 | |
350 | /* reset the per method handler */ | |
351 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
352 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
353 | ||
354 | /* and try new method */ | |
fee56204 | 355 | if (method->userauth(authctxt) != 0) { |
356 | debug2("we sent a %s packet, wait for reply", method->name); | |
357 | break; | |
358 | } else { | |
359 | debug2("we did not send a packet, disable method"); | |
360 | method->enabled = NULL; | |
361 | } | |
362 | } | |
363 | } | |
d6133f43 | 364 | |
fee56204 | 365 | void |
7819b5c3 | 366 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 367 | { |
9616313f | 368 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 369 | "type %d", type); |
9616313f | 370 | } |
d6133f43 | 371 | |
9616313f | 372 | void |
7819b5c3 | 373 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 374 | { |
375 | char *msg, *lang; | |
c8f0cf13 | 376 | |
9616313f | 377 | debug3("input_userauth_banner"); |
378 | msg = packet_get_string(NULL); | |
379 | lang = packet_get_string(NULL); | |
19e633e7 | 380 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
381 | fprintf(stderr, "%s", msg); | |
9616313f | 382 | xfree(msg); |
383 | xfree(lang); | |
188adeb2 | 384 | } |
d6133f43 | 385 | |
188adeb2 | 386 | void |
7819b5c3 | 387 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 388 | { |
389 | Authctxt *authctxt = ctxt; | |
390 | if (authctxt == NULL) | |
391 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 392 | if (authctxt->authlist) { |
fee56204 | 393 | xfree(authctxt->authlist); |
c8f0cf13 | 394 | authctxt->authlist = NULL; |
395 | } | |
396 | if (authctxt->methoddata) { | |
7364bd04 | 397 | xfree(authctxt->methoddata); |
c8f0cf13 | 398 | authctxt->methoddata = NULL; |
399 | } | |
188adeb2 | 400 | authctxt->success = 1; /* break out */ |
401 | } | |
d6133f43 | 402 | |
188adeb2 | 403 | void |
7819b5c3 | 404 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 405 | { |
188adeb2 | 406 | Authctxt *authctxt = ctxt; |
407 | char *authlist = NULL; | |
408 | int partial; | |
188adeb2 | 409 | |
410 | if (authctxt == NULL) | |
411 | fatal("input_userauth_failure: no authentication context"); | |
412 | ||
94ec8c6b | 413 | authlist = packet_get_string(NULL); |
188adeb2 | 414 | partial = packet_get_char(); |
95500969 | 415 | packet_check_eom(); |
188adeb2 | 416 | |
417 | if (partial != 0) | |
bbe88b6d | 418 | logit("Authenticated with partial success."); |
6226a8f8 | 419 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 420 | |
fee56204 | 421 | userauth(authctxt, authlist); |
422 | } | |
423 | void | |
7819b5c3 | 424 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 425 | { |
426 | Authctxt *authctxt = ctxt; | |
427 | Key *key = NULL; | |
43348518 | 428 | Identity *id = NULL; |
fee56204 | 429 | Buffer b; |
c66f9d0e | 430 | int pktype, sent = 0; |
431 | u_int alen, blen; | |
432 | char *pkalg, *fp; | |
433 | u_char *pkblob; | |
fee56204 | 434 | |
435 | if (authctxt == NULL) | |
436 | fatal("input_userauth_pk_ok: no authentication context"); | |
437 | if (datafellows & SSH_BUG_PKOK) { | |
438 | /* this is similar to SSH_BUG_PKAUTH */ | |
439 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
440 | pkblob = packet_get_string(&blen); | |
441 | buffer_init(&b); | |
442 | buffer_append(&b, pkblob, blen); | |
443 | pkalg = buffer_get_string(&b, &alen); | |
444 | buffer_free(&b); | |
445 | } else { | |
446 | pkalg = packet_get_string(&alen); | |
447 | pkblob = packet_get_string(&blen); | |
448 | } | |
95500969 | 449 | packet_check_eom(); |
fee56204 | 450 | |
43348518 | 451 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 452 | |
43348518 | 453 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
454 | debug("unknown pkalg %s", pkalg); | |
455 | goto done; | |
456 | } | |
457 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
458 | debug("no key from blob. pkalg %s", pkalg); | |
459 | goto done; | |
460 | } | |
461 | if (key->type != pktype) { | |
462 | error("input_userauth_pk_ok: type mismatch " | |
463 | "for decoded key (received %d, expected %d)", | |
464 | key->type, pktype); | |
465 | goto done; | |
466 | } | |
467 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
468 | debug2("input_userauth_pk_ok: fp %s", fp); | |
469 | xfree(fp); | |
470 | ||
b56e99e2 | 471 | /* |
472 | * search keys in the reverse order, because last candidate has been | |
473 | * moved to the end of the queue. this also avoids confusion by | |
474 | * duplicate keys | |
475 | */ | |
484b2208 | 476 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 477 | if (key_equal(key, id->key)) { |
478 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 479 | break; |
480 | } | |
43348518 | 481 | } |
482 | done: | |
fee56204 | 483 | if (key != NULL) |
484 | key_free(key); | |
485 | xfree(pkalg); | |
486 | xfree(pkblob); | |
487 | ||
343288b8 | 488 | /* try another method if we did not send a packet */ |
fee56204 | 489 | if (sent == 0) |
490 | userauth(authctxt, NULL); | |
188adeb2 | 491 | } |
492 | ||
7364bd04 | 493 | #ifdef GSSAPI |
aff51935 | 494 | int |
7364bd04 | 495 | userauth_gssapi(Authctxt *authctxt) |
496 | { | |
497 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 498 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 499 | static u_int mech = 0; |
7364bd04 | 500 | OM_uint32 min; |
501 | int ok = 0; | |
502 | ||
503 | /* Try one GSSAPI method at a time, rather than sending them all at | |
504 | * once. */ | |
505 | ||
b0b30ca6 | 506 | if (gss_supported == NULL) |
507 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 508 | |
509 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 510 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 511 | if (gssctxt) |
512 | ssh_gssapi_delete_ctx(&gssctxt); | |
513 | ssh_gssapi_build_ctx(&gssctxt); | |
b0b30ca6 | 514 | ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]); |
7364bd04 | 515 | |
516 | /* My DER encoding requires length<128 */ | |
b0b30ca6 | 517 | if (gss_supported->elements[mech].length < 128 && |
7364bd04 | 518 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
519 | authctxt->host))) { | |
520 | ok = 1; /* Mechanism works */ | |
521 | } else { | |
522 | mech++; | |
523 | } | |
524 | } | |
525 | ||
18fc231c | 526 | if (!ok) { |
527 | ssh_gssapi_delete_ctx(&gssctxt); | |
2ceb8101 | 528 | return 0; |
18fc231c | 529 | } |
7364bd04 | 530 | |
531 | authctxt->methoddata=(void *)gssctxt; | |
532 | ||
533 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
534 | packet_put_cstring(authctxt->server_user); | |
535 | packet_put_cstring(authctxt->service); | |
536 | packet_put_cstring(authctxt->method->name); | |
537 | ||
538 | packet_put_int(1); | |
539 | ||
d8d9afd0 | 540 | packet_put_int((gss_supported->elements[mech].length) + 2); |
541 | packet_put_char(SSH_GSS_OIDTYPE); | |
542 | packet_put_char(gss_supported->elements[mech].length); | |
543 | packet_put_raw(gss_supported->elements[mech].elements, | |
544 | gss_supported->elements[mech].length); | |
7364bd04 | 545 | |
546 | packet_send(); | |
547 | ||
548 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
549 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
550 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
551 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
552 | ||
553 | mech++; /* Move along to next candidate */ | |
554 | ||
555 | return 1; | |
556 | } | |
557 | ||
b930668c | 558 | static OM_uint32 |
559 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
560 | { | |
561 | Authctxt *authctxt = ctxt; | |
562 | Gssctxt *gssctxt = authctxt->methoddata; | |
563 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 564 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
565 | gss_buffer_desc gssbuf; | |
0789992b | 566 | OM_uint32 status, ms, flags; |
567 | Buffer b; | |
b6453d99 | 568 | |
b930668c | 569 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 570 | recv_tok, &send_tok, &flags); |
b930668c | 571 | |
572 | if (send_tok.length > 0) { | |
573 | if (GSS_ERROR(status)) | |
574 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
575 | else | |
576 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 577 | |
b930668c | 578 | packet_put_string(send_tok.value, send_tok.length); |
579 | packet_send(); | |
580 | gss_release_buffer(&ms, &send_tok); | |
581 | } | |
b6453d99 | 582 | |
b930668c | 583 | if (status == GSS_S_COMPLETE) { |
0789992b | 584 | /* send either complete or MIC, depending on mechanism */ |
585 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
586 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
587 | packet_send(); | |
588 | } else { | |
589 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
590 | authctxt->service, "gssapi-with-mic"); | |
591 | ||
592 | gssbuf.value = buffer_ptr(&b); | |
593 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 594 | |
0789992b | 595 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 596 | |
0789992b | 597 | if (!GSS_ERROR(status)) { |
598 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
599 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 600 | |
0789992b | 601 | packet_send(); |
602 | } | |
b6453d99 | 603 | |
0789992b | 604 | buffer_free(&b); |
605 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 606 | } |
b930668c | 607 | } |
b6453d99 | 608 | |
b930668c | 609 | return status; |
610 | } | |
611 | ||
7364bd04 | 612 | void |
613 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
614 | { | |
615 | Authctxt *authctxt = ctxt; | |
616 | Gssctxt *gssctxt; | |
7364bd04 | 617 | int oidlen; |
618 | char *oidv; | |
7364bd04 | 619 | |
620 | if (authctxt == NULL) | |
621 | fatal("input_gssapi_response: no authentication context"); | |
622 | gssctxt = authctxt->methoddata; | |
623 | ||
624 | /* Setup our OID */ | |
625 | oidv = packet_get_string(&oidlen); | |
626 | ||
d8d9afd0 | 627 | if (oidlen <= 2 || |
628 | oidv[0] != SSH_GSS_OIDTYPE || | |
629 | oidv[1] != oidlen - 2) { | |
b930668c | 630 | xfree(oidv); |
d8d9afd0 | 631 | debug("Badly encoded mechanism OID received"); |
632 | userauth(authctxt, NULL); | |
d8d9afd0 | 633 | return; |
7364bd04 | 634 | } |
635 | ||
d8d9afd0 | 636 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
637 | fatal("Server returned different OID than expected"); | |
638 | ||
7364bd04 | 639 | packet_check_eom(); |
640 | ||
641 | xfree(oidv); | |
642 | ||
b930668c | 643 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 644 | /* Start again with next method on list */ |
645 | debug("Trying to start again"); | |
646 | userauth(authctxt, NULL); | |
647 | return; | |
648 | } | |
7364bd04 | 649 | } |
650 | ||
651 | void | |
652 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
653 | { | |
654 | Authctxt *authctxt = ctxt; | |
7364bd04 | 655 | gss_buffer_desc recv_tok; |
b930668c | 656 | OM_uint32 status; |
7364bd04 | 657 | u_int slen; |
658 | ||
659 | if (authctxt == NULL) | |
660 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 661 | |
662 | recv_tok.value = packet_get_string(&slen); | |
663 | recv_tok.length = slen; /* safe typecast */ | |
664 | ||
665 | packet_check_eom(); | |
666 | ||
b930668c | 667 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 668 | |
669 | xfree(recv_tok.value); | |
670 | ||
671 | if (GSS_ERROR(status)) { | |
7364bd04 | 672 | /* Start again with the next method in the list */ |
673 | userauth(authctxt, NULL); | |
674 | return; | |
675 | } | |
7364bd04 | 676 | } |
677 | ||
678 | void | |
679 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
680 | { | |
681 | Authctxt *authctxt = ctxt; | |
682 | Gssctxt *gssctxt; | |
683 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
684 | gss_buffer_desc recv_tok; | |
685 | OM_uint32 status, ms; | |
f99e1ca4 | 686 | u_int len; |
7364bd04 | 687 | |
688 | if (authctxt == NULL) | |
689 | fatal("input_gssapi_response: no authentication context"); | |
690 | gssctxt = authctxt->methoddata; | |
691 | ||
f99e1ca4 | 692 | recv_tok.value = packet_get_string(&len); |
693 | recv_tok.length = len; | |
7364bd04 | 694 | |
695 | packet_check_eom(); | |
696 | ||
697 | /* Stick it into GSSAPI and see what it says */ | |
698 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 699 | &recv_tok, &send_tok, NULL); |
7364bd04 | 700 | |
701 | xfree(recv_tok.value); | |
702 | gss_release_buffer(&ms, &send_tok); | |
703 | ||
704 | /* Server will be returning a failed packet after this one */ | |
705 | } | |
706 | ||
707 | void | |
708 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
709 | { | |
710 | OM_uint32 maj, min; | |
711 | char *msg; | |
712 | char *lang; | |
713 | ||
714 | maj=packet_get_int(); | |
715 | min=packet_get_int(); | |
716 | msg=packet_get_string(NULL); | |
717 | lang=packet_get_string(NULL); | |
718 | ||
719 | packet_check_eom(); | |
720 | ||
17318dd6 | 721 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 722 | xfree(msg); |
723 | xfree(lang); | |
724 | } | |
725 | #endif /* GSSAPI */ | |
726 | ||
94ec8c6b | 727 | int |
728 | userauth_none(Authctxt *authctxt) | |
729 | { | |
730 | /* initial userauth request */ | |
731 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
732 | packet_put_cstring(authctxt->server_user); | |
733 | packet_put_cstring(authctxt->service); | |
734 | packet_put_cstring(authctxt->method->name); | |
735 | packet_send(); | |
94ec8c6b | 736 | return 1; |
737 | } | |
738 | ||
a306f2dd | 739 | int |
188adeb2 | 740 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 741 | { |
1d1ffb87 | 742 | static int attempt = 0; |
67ec167d | 743 | char prompt[150]; |
a306f2dd | 744 | char *password; |
745 | ||
fa649821 | 746 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 747 | return 0; |
748 | ||
6aacefa7 | 749 | if (attempt != 1) |
fa649821 | 750 | error("Permission denied, please try again."); |
751 | ||
f72e01a5 | 752 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 753 | authctxt->server_user, authctxt->host); |
a306f2dd | 754 | password = read_passphrase(prompt, 0); |
755 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 756 | packet_put_cstring(authctxt->server_user); |
757 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 758 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 759 | packet_put_char(0); |
a6215e53 | 760 | packet_put_cstring(password); |
a306f2dd | 761 | memset(password, 0, strlen(password)); |
762 | xfree(password); | |
b4b701be | 763 | packet_add_padding(64); |
a306f2dd | 764 | packet_send(); |
67ec167d | 765 | |
7203d6bb | 766 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 767 | &input_userauth_passwd_changereq); |
768 | ||
a306f2dd | 769 | return 1; |
770 | } | |
67ec167d | 771 | /* |
772 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
773 | */ | |
774 | void | |
ef077e37 | 775 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 776 | { |
777 | Authctxt *authctxt = ctxt; | |
778 | char *info, *lang, *password = NULL, *retype = NULL; | |
779 | char prompt[150]; | |
780 | ||
781 | debug2("input_userauth_passwd_changereq"); | |
782 | ||
783 | if (authctxt == NULL) | |
784 | fatal("input_userauth_passwd_changereq: " | |
785 | "no authentication context"); | |
786 | ||
787 | info = packet_get_string(NULL); | |
788 | lang = packet_get_string(NULL); | |
789 | if (strlen(info) > 0) | |
bbe88b6d | 790 | logit("%s", info); |
67ec167d | 791 | xfree(info); |
792 | xfree(lang); | |
793 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
794 | packet_put_cstring(authctxt->server_user); | |
795 | packet_put_cstring(authctxt->service); | |
796 | packet_put_cstring(authctxt->method->name); | |
797 | packet_put_char(1); /* additional info */ | |
7203d6bb | 798 | snprintf(prompt, sizeof(prompt), |
67ec167d | 799 | "Enter %.30s@%.128s's old password: ", |
800 | authctxt->server_user, authctxt->host); | |
801 | password = read_passphrase(prompt, 0); | |
802 | packet_put_cstring(password); | |
803 | memset(password, 0, strlen(password)); | |
804 | xfree(password); | |
805 | password = NULL; | |
806 | while (password == NULL) { | |
7203d6bb | 807 | snprintf(prompt, sizeof(prompt), |
67ec167d | 808 | "Enter %.30s@%.128s's new password: ", |
809 | authctxt->server_user, authctxt->host); | |
810 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
811 | if (password == NULL) { | |
812 | /* bail out */ | |
813 | return; | |
814 | } | |
7203d6bb | 815 | snprintf(prompt, sizeof(prompt), |
67ec167d | 816 | "Retype %.30s@%.128s's new password: ", |
817 | authctxt->server_user, authctxt->host); | |
818 | retype = read_passphrase(prompt, 0); | |
819 | if (strcmp(password, retype) != 0) { | |
820 | memset(password, 0, strlen(password)); | |
821 | xfree(password); | |
bbe88b6d | 822 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 823 | password = NULL; |
824 | } | |
825 | memset(retype, 0, strlen(retype)); | |
826 | xfree(retype); | |
827 | } | |
828 | packet_put_cstring(password); | |
829 | memset(password, 0, strlen(password)); | |
830 | xfree(password); | |
831 | packet_add_padding(64); | |
832 | packet_send(); | |
7203d6bb | 833 | |
834 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 835 | &input_userauth_passwd_changereq); |
836 | } | |
a306f2dd | 837 | |
43348518 | 838 | static int |
839 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
840 | u_char *data, u_int datalen) | |
841 | { | |
842 | Key *prv; | |
843 | int ret; | |
844 | ||
845 | /* the agent supports this key */ | |
846 | if (id->ac) | |
847 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
848 | data, datalen)); | |
849 | /* | |
850 | * we have already loaded the private key or | |
851 | * the private key is stored in external hardware | |
852 | */ | |
853 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
854 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
855 | /* load the private key from the file */ | |
856 | if ((prv = load_identity_file(id->filename)) == NULL) | |
857 | return (-1); | |
858 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
859 | key_free(prv); | |
860 | return (ret); | |
fee56204 | 861 | } |
862 | ||
396c147e | 863 | static int |
43348518 | 864 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 865 | { |
866 | Buffer b; | |
1e3b8b07 | 867 | u_char *blob, *signature; |
c66f9d0e | 868 | u_int bloblen, slen; |
a27002e5 | 869 | u_int skip = 0; |
2e73a022 | 870 | int ret = -1; |
94ec8c6b | 871 | int have_sig = 1; |
a306f2dd | 872 | |
cbc5abf9 | 873 | debug3("sign_and_send_pubkey"); |
fee56204 | 874 | |
43348518 | 875 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 876 | /* we cannot handle this key */ |
cbc5abf9 | 877 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 878 | return 0; |
879 | } | |
a306f2dd | 880 | /* data to be signed */ |
881 | buffer_init(&b); | |
33de75a3 | 882 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 883 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 884 | skip = session_id2_len; |
33de75a3 | 885 | } else { |
886 | buffer_put_string(&b, session_id2, session_id2_len); | |
887 | skip = buffer_len(&b); | |
74fc9186 | 888 | } |
a306f2dd | 889 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 890 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 891 | buffer_put_cstring(&b, |
cbc5abf9 | 892 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 893 | "ssh-userauth" : |
188adeb2 | 894 | authctxt->service); |
cbc5abf9 | 895 | if (datafellows & SSH_BUG_PKAUTH) { |
896 | buffer_put_char(&b, have_sig); | |
897 | } else { | |
898 | buffer_put_cstring(&b, authctxt->method->name); | |
899 | buffer_put_char(&b, have_sig); | |
43348518 | 900 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 901 | } |
a306f2dd | 902 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 903 | |
904 | /* generate signature */ | |
43348518 | 905 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 906 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 907 | if (ret == -1) { |
908 | xfree(blob); | |
909 | buffer_free(&b); | |
910 | return 0; | |
911 | } | |
fa08c86b | 912 | #ifdef DEBUG_PK |
a306f2dd | 913 | buffer_dump(&b); |
914 | #endif | |
cbc5abf9 | 915 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 916 | buffer_clear(&b); |
917 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 918 | skip = session_id2_len; |
d0c832f3 | 919 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 920 | buffer_put_cstring(&b, authctxt->server_user); |
921 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 922 | buffer_put_cstring(&b, authctxt->method->name); |
923 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 924 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 925 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 926 | buffer_put_string(&b, blob, bloblen); |
927 | } | |
928 | xfree(blob); | |
fee56204 | 929 | |
a306f2dd | 930 | /* append signature */ |
931 | buffer_put_string(&b, signature, slen); | |
932 | xfree(signature); | |
933 | ||
934 | /* skip session id and packet type */ | |
74fc9186 | 935 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 936 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 937 | buffer_consume(&b, skip + 1); |
a306f2dd | 938 | |
939 | /* put remaining data from buffer into packet */ | |
940 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
941 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
942 | buffer_free(&b); | |
a306f2dd | 943 | packet_send(); |
2e73a022 | 944 | |
945 | return 1; | |
4c8722d9 | 946 | } |
947 | ||
396c147e | 948 | static int |
43348518 | 949 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 950 | { |
fee56204 | 951 | u_char *blob; |
21b30f38 | 952 | u_int bloblen, have_sig = 0; |
4c8722d9 | 953 | |
fee56204 | 954 | debug3("send_pubkey_test"); |
955 | ||
43348518 | 956 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 957 | /* we cannot handle this key */ |
958 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 959 | return 0; |
960 | } | |
fee56204 | 961 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 962 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 963 | |
fee56204 | 964 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
965 | packet_put_cstring(authctxt->server_user); | |
966 | packet_put_cstring(authctxt->service); | |
967 | packet_put_cstring(authctxt->method->name); | |
968 | packet_put_char(have_sig); | |
969 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 970 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 971 | packet_put_string(blob, bloblen); |
972 | xfree(blob); | |
973 | packet_send(); | |
974 | return 1; | |
975 | } | |
976 | ||
396c147e | 977 | static Key * |
fee56204 | 978 | load_identity_file(char *filename) |
979 | { | |
980 | Key *private; | |
981 | char prompt[300], *passphrase; | |
fc231518 | 982 | int perm_ok, quit, i; |
d156519a | 983 | struct stat st; |
fee56204 | 984 | |
d156519a | 985 | if (stat(filename, &st) < 0) { |
986 | debug3("no such identity: %s", filename); | |
987 | return NULL; | |
988 | } | |
fc231518 | 989 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
990 | if (!perm_ok) | |
991 | return NULL; | |
aeaa3d9e | 992 | if (private == NULL) { |
993 | if (options.batch_mode) | |
fee56204 | 994 | return NULL; |
4c8722d9 | 995 | snprintf(prompt, sizeof prompt, |
184eed6a | 996 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 997 | for (i = 0; i < options.number_of_password_prompts; i++) { |
998 | passphrase = read_passphrase(prompt, 0); | |
999 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 1000 | private = key_load_private_type(KEY_UNSPEC, |
1001 | filename, passphrase, NULL, NULL); | |
fee56204 | 1002 | quit = 0; |
188adeb2 | 1003 | } else { |
1004 | debug2("no passphrase given, try next key"); | |
fee56204 | 1005 | quit = 1; |
188adeb2 | 1006 | } |
1007 | memset(passphrase, 0, strlen(passphrase)); | |
1008 | xfree(passphrase); | |
aeaa3d9e | 1009 | if (private != NULL || quit) |
188adeb2 | 1010 | break; |
1011 | debug2("bad passphrase given, try again..."); | |
1012 | } | |
4c8722d9 | 1013 | } |
fee56204 | 1014 | return private; |
1015 | } | |
1016 | ||
43348518 | 1017 | /* |
1018 | * try keys in the following order: | |
1019 | * 1. agent keys that are found in the config file | |
1020 | * 2. other agent keys | |
1021 | * 3. keys that are only listed in the config file | |
1022 | */ | |
1023 | static void | |
1024 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1025 | { |
43348518 | 1026 | Identity *id; |
1027 | Idlist agent, files, *preferred; | |
1028 | Key *key; | |
1029 | AuthenticationConnection *ac; | |
1030 | char *comment; | |
1031 | int i, found; | |
1032 | ||
1033 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1034 | TAILQ_INIT(&files); /* keys from the config file */ | |
1035 | preferred = &authctxt->keys; | |
1036 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1037 | ||
1038 | /* list of keys stored in the filesystem */ | |
1039 | for (i = 0; i < options.num_identity_files; i++) { | |
1040 | key = options.identity_keys[i]; | |
1041 | if (key && key->type == KEY_RSA1) | |
1042 | continue; | |
1043 | options.identity_keys[i] = NULL; | |
52e3daed | 1044 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1045 | id->key = key; |
1046 | id->filename = xstrdup(options.identity_files[i]); | |
1047 | TAILQ_INSERT_TAIL(&files, id, next); | |
1048 | } | |
1049 | /* list of keys supported by the agent */ | |
1050 | if ((ac = ssh_get_authentication_connection())) { | |
1051 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1052 | key != NULL; | |
1053 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1054 | found = 0; | |
1055 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1056 | /* agent keys from the config file are preferred */ |
43348518 | 1057 | if (key_equal(key, id->key)) { |
1058 | key_free(key); | |
1059 | xfree(comment); | |
1060 | TAILQ_REMOVE(&files, id, next); | |
1061 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1062 | id->ac = ac; | |
1063 | found = 1; | |
1064 | break; | |
1065 | } | |
1066 | } | |
3a065ed0 | 1067 | if (!found && !options.identities_only) { |
52e3daed | 1068 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1069 | id->key = key; |
1070 | id->filename = comment; | |
1071 | id->ac = ac; | |
1072 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1073 | } | |
1074 | } | |
1075 | /* append remaining agent keys */ | |
1076 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1077 | TAILQ_REMOVE(&agent, id, next); | |
1078 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1079 | } | |
1080 | authctxt->agent = ac; | |
1081 | } | |
1082 | /* append remaining keys from the config file */ | |
1083 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1084 | TAILQ_REMOVE(&files, id, next); | |
1085 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1086 | } | |
1087 | TAILQ_FOREACH(id, preferred, next) { | |
1088 | debug2("key: %s (%p)", id->filename, id->key); | |
1089 | } | |
fee56204 | 1090 | } |
1091 | ||
43348518 | 1092 | static void |
1093 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1094 | { |
43348518 | 1095 | Identity *id; |
1096 | ||
1097 | if (authctxt->agent != NULL) | |
1098 | ssh_close_authentication_connection(authctxt->agent); | |
1099 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1100 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1101 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1102 | if (id->key) | |
1103 | key_free(id->key); | |
1104 | if (id->filename) | |
1105 | xfree(id->filename); | |
1106 | xfree(id); | |
2e73a022 | 1107 | } |
a306f2dd | 1108 | } |
1109 | ||
188adeb2 | 1110 | int |
1111 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1112 | { |
43348518 | 1113 | Identity *id; |
188adeb2 | 1114 | int sent = 0; |
1115 | ||
43348518 | 1116 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1117 | if (id->tried++) | |
1118 | return (0); | |
b56e99e2 | 1119 | /* move key to the end of the queue */ |
43348518 | 1120 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1121 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1122 | /* | |
1123 | * send a test message if we have the public key. for | |
1124 | * encrypted keys we cannot do this and have to load the | |
1125 | * private key instead | |
1126 | */ | |
1127 | if (id->key && id->key->type != KEY_RSA1) { | |
1128 | debug("Offering public key: %s", id->filename); | |
1129 | sent = send_pubkey_test(authctxt, id); | |
1130 | } else if (id->key == NULL) { | |
1131 | debug("Trying private key: %s", id->filename); | |
1132 | id->key = load_identity_file(id->filename); | |
1133 | if (id->key != NULL) { | |
1134 | id->isprivate = 1; | |
1135 | sent = sign_and_send_pubkey(authctxt, id); | |
1136 | key_free(id->key); | |
1137 | id->key = NULL; | |
fee56204 | 1138 | } |
fee56204 | 1139 | } |
43348518 | 1140 | if (sent) |
1141 | return (sent); | |
fa08c86b | 1142 | } |
43348518 | 1143 | return (0); |
188adeb2 | 1144 | } |
a306f2dd | 1145 | |
94ec8c6b | 1146 | /* |
1147 | * Send userauth request message specifying keyboard-interactive method. | |
1148 | */ | |
1149 | int | |
1150 | userauth_kbdint(Authctxt *authctxt) | |
1151 | { | |
1152 | static int attempt = 0; | |
1153 | ||
1154 | if (attempt++ >= options.number_of_password_prompts) | |
1155 | return 0; | |
6b759005 | 1156 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1157 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1158 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1159 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1160 | return 0; | |
1161 | } | |
94ec8c6b | 1162 | |
1163 | debug2("userauth_kbdint"); | |
1164 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1165 | packet_put_cstring(authctxt->server_user); | |
1166 | packet_put_cstring(authctxt->service); | |
1167 | packet_put_cstring(authctxt->method->name); | |
1168 | packet_put_cstring(""); /* lang */ | |
1169 | packet_put_cstring(options.kbd_interactive_devices ? | |
1170 | options.kbd_interactive_devices : ""); | |
1171 | packet_send(); | |
94ec8c6b | 1172 | |
1173 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1174 | return 1; | |
1175 | } | |
1176 | ||
1177 | /* | |
f72e01a5 | 1178 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1179 | */ |
1180 | void | |
7819b5c3 | 1181 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1182 | { |
1183 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1184 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1185 | u_int num_prompts, i; |
94ec8c6b | 1186 | int echo = 0; |
1187 | ||
1188 | debug2("input_userauth_info_req"); | |
1189 | ||
1190 | if (authctxt == NULL) | |
1191 | fatal("input_userauth_info_req: no authentication context"); | |
1192 | ||
6b759005 | 1193 | authctxt->info_req_seen = 1; |
1194 | ||
94ec8c6b | 1195 | name = packet_get_string(NULL); |
1196 | inst = packet_get_string(NULL); | |
1197 | lang = packet_get_string(NULL); | |
94ec8c6b | 1198 | if (strlen(name) > 0) |
bbe88b6d | 1199 | logit("%s", name); |
94ec8c6b | 1200 | if (strlen(inst) > 0) |
bbe88b6d | 1201 | logit("%s", inst); |
f72e01a5 | 1202 | xfree(name); |
94ec8c6b | 1203 | xfree(inst); |
f72e01a5 | 1204 | xfree(lang); |
94ec8c6b | 1205 | |
1206 | num_prompts = packet_get_int(); | |
1207 | /* | |
1208 | * Begin to build info response packet based on prompts requested. | |
1209 | * We commit to providing the correct number of responses, so if | |
1210 | * further on we run into a problem that prevents this, we have to | |
1211 | * be sure and clean this up and send a correct error response. | |
1212 | */ | |
1213 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1214 | packet_put_int(num_prompts); | |
1215 | ||
5ba55ada | 1216 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1217 | for (i = 0; i < num_prompts; i++) { |
1218 | prompt = packet_get_string(NULL); | |
1219 | echo = packet_get_char(); | |
1220 | ||
1843a425 | 1221 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1222 | |
a6215e53 | 1223 | packet_put_cstring(response); |
94ec8c6b | 1224 | memset(response, 0, strlen(response)); |
1225 | xfree(response); | |
1226 | xfree(prompt); | |
1227 | } | |
95500969 | 1228 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1229 | |
b4b701be | 1230 | packet_add_padding(64); |
94ec8c6b | 1231 | packet_send(); |
94ec8c6b | 1232 | } |
a306f2dd | 1233 | |
39c00dc2 | 1234 | static int |
d6133f43 | 1235 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1236 | u_char *data, u_int datalen) |
1237 | { | |
1238 | Buffer b; | |
7091a26b | 1239 | struct stat st; |
39c00dc2 | 1240 | pid_t pid; |
d4826734 | 1241 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1242 | |
6226a8f8 | 1243 | debug2("ssh_keysign called"); |
39c00dc2 | 1244 | |
7091a26b | 1245 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1246 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1247 | return -1; | |
1248 | } | |
39c00dc2 | 1249 | if (fflush(stdout) != 0) |
1250 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1251 | if (pipe(to) < 0) { | |
1252 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1253 | return -1; | |
1254 | } | |
1255 | if (pipe(from) < 0) { | |
1256 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1257 | return -1; | |
1258 | } | |
1259 | if ((pid = fork()) < 0) { | |
1260 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1261 | return -1; | |
1262 | } | |
1263 | if (pid == 0) { | |
3c33c1b6 | 1264 | permanently_drop_suid(getuid()); |
39c00dc2 | 1265 | close(from[0]); |
1266 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1267 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1268 | close(to[1]); | |
1269 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1270 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1271 | close(from[1]); |
1272 | close(to[0]); | |
a3f69458 | 1273 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1274 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1275 | strerror(errno)); | |
1276 | } | |
1277 | close(from[1]); | |
1278 | close(to[0]); | |
1279 | ||
1280 | buffer_init(&b); | |
d4826734 | 1281 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1282 | buffer_put_string(&b, data, datalen); |
d3cbe6f8 | 1283 | if (ssh_msg_send(to[1], version, &b) == -1) |
1284 | fatal("ssh_keysign: couldn't send request"); | |
39c00dc2 | 1285 | |
e987fdbe | 1286 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1287 | error("ssh_keysign: no reply"); |
43f7a4b8 | 1288 | buffer_free(&b); |
39c00dc2 | 1289 | return -1; |
1290 | } | |
39c00dc2 | 1291 | close(from[0]); |
1292 | close(to[1]); | |
1293 | ||
d4826734 | 1294 | while (waitpid(pid, &status, 0) < 0) |
1295 | if (errno != EINTR) | |
1296 | break; | |
39c00dc2 | 1297 | |
7091a26b | 1298 | if (buffer_get_char(&b) != version) { |
1299 | error("ssh_keysign: bad version"); | |
43f7a4b8 | 1300 | buffer_free(&b); |
7091a26b | 1301 | return -1; |
1302 | } | |
1303 | *sigp = buffer_get_string(&b, lenp); | |
43f7a4b8 | 1304 | buffer_free(&b); |
7091a26b | 1305 | |
39c00dc2 | 1306 | return 0; |
1307 | } | |
1308 | ||
8002af61 | 1309 | int |
1310 | userauth_hostbased(Authctxt *authctxt) | |
1311 | { | |
1312 | Key *private = NULL; | |
39c00dc2 | 1313 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1314 | Buffer b; |
1315 | u_char *signature, *blob; | |
1316 | char *chost, *pkalg, *p; | |
8dddf799 | 1317 | const char *service; |
8002af61 | 1318 | u_int blen, slen; |
f98c3421 | 1319 | int ok, i, len, found = 0; |
8002af61 | 1320 | |
8002af61 | 1321 | /* check for a useful key */ |
39c00dc2 | 1322 | for (i = 0; i < sensitive->nkeys; i++) { |
1323 | private = sensitive->keys[i]; | |
8002af61 | 1324 | if (private && private->type != KEY_RSA1) { |
1325 | found = 1; | |
1326 | /* we take and free the key */ | |
39c00dc2 | 1327 | sensitive->keys[i] = NULL; |
8002af61 | 1328 | break; |
1329 | } | |
1330 | } | |
1331 | if (!found) { | |
6226a8f8 | 1332 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1333 | return 0; |
1334 | } | |
1335 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1336 | key_free(private); | |
8002af61 | 1337 | return 0; |
1338 | } | |
e8d59b4d | 1339 | /* figure out a name for the client host */ |
1340 | p = get_local_name(packet_get_connection_in()); | |
1341 | if (p == NULL) { | |
1342 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1343 | key_free(private); | |
18fc231c | 1344 | xfree(blob); |
e8d59b4d | 1345 | return 0; |
1346 | } | |
1347 | len = strlen(p) + 2; | |
52e3daed | 1348 | xasprintf(&chost, "%s.", p); |
e8d59b4d | 1349 | debug2("userauth_hostbased: chost %s", chost); |
3e2f2431 | 1350 | xfree(p); |
e8d59b4d | 1351 | |
8dddf799 | 1352 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1353 | authctxt->service; | |
8002af61 | 1354 | pkalg = xstrdup(key_ssh_name(private)); |
1355 | buffer_init(&b); | |
8002af61 | 1356 | /* construct data */ |
8dddf799 | 1357 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1358 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1359 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1360 | buffer_put_cstring(&b, service); |
8002af61 | 1361 | buffer_put_cstring(&b, authctxt->method->name); |
1362 | buffer_put_cstring(&b, pkalg); | |
1363 | buffer_put_string(&b, blob, blen); | |
1364 | buffer_put_cstring(&b, chost); | |
1365 | buffer_put_cstring(&b, authctxt->local_user); | |
1366 | #ifdef DEBUG_PK | |
1367 | buffer_dump(&b); | |
1368 | #endif | |
39c00dc2 | 1369 | if (sensitive->external_keysign) |
1370 | ok = ssh_keysign(private, &signature, &slen, | |
1371 | buffer_ptr(&b), buffer_len(&b)); | |
1372 | else | |
1373 | ok = key_sign(private, &signature, &slen, | |
1374 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1375 | key_free(private); |
1376 | buffer_free(&b); | |
1377 | if (ok != 0) { | |
1378 | error("key_sign failed"); | |
1379 | xfree(chost); | |
1380 | xfree(pkalg); | |
18fc231c | 1381 | xfree(blob); |
8002af61 | 1382 | return 0; |
1383 | } | |
1384 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1385 | packet_put_cstring(authctxt->server_user); | |
1386 | packet_put_cstring(authctxt->service); | |
1387 | packet_put_cstring(authctxt->method->name); | |
1388 | packet_put_cstring(pkalg); | |
1389 | packet_put_string(blob, blen); | |
1390 | packet_put_cstring(chost); | |
1391 | packet_put_cstring(authctxt->local_user); | |
1392 | packet_put_string(signature, slen); | |
1393 | memset(signature, 's', slen); | |
1394 | xfree(signature); | |
1395 | xfree(chost); | |
1396 | xfree(pkalg); | |
18fc231c | 1397 | xfree(blob); |
8002af61 | 1398 | |
1399 | packet_send(); | |
1400 | return 1; | |
1401 | } | |
1402 | ||
188adeb2 | 1403 | /* find auth method */ |
1404 | ||
188adeb2 | 1405 | /* |
1406 | * given auth method name, if configurable options permit this method fill | |
1407 | * in auth_ident field and return true, otherwise return false. | |
1408 | */ | |
396c147e | 1409 | static int |
188adeb2 | 1410 | authmethod_is_enabled(Authmethod *method) |
1411 | { | |
1412 | if (method == NULL) | |
1413 | return 0; | |
1414 | /* return false if options indicate this method is disabled */ | |
1415 | if (method->enabled == NULL || *method->enabled == 0) | |
1416 | return 0; | |
1417 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1418 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1419 | return 0; | |
1420 | return 1; | |
1421 | } | |
a306f2dd | 1422 | |
396c147e | 1423 | static Authmethod * |
188adeb2 | 1424 | authmethod_lookup(const char *name) |
1425 | { | |
1426 | Authmethod *method = NULL; | |
1427 | if (name != NULL) | |
1428 | for (method = authmethods; method->name != NULL; method++) | |
1429 | if (strcmp(name, method->name) == 0) | |
1430 | return method; | |
1431 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1432 | return NULL; | |
1433 | } | |
1434 | ||
cab80f75 | 1435 | /* XXX internal state */ |
1436 | static Authmethod *current = NULL; | |
1437 | static char *supported = NULL; | |
1438 | static char *preferred = NULL; | |
d6133f43 | 1439 | |
188adeb2 | 1440 | /* |
1441 | * Given the authentication method list sent by the server, return the | |
1442 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1443 | * use a built-in default list. |
2b87da3b | 1444 | */ |
396c147e | 1445 | static Authmethod * |
188adeb2 | 1446 | authmethod_get(char *authlist) |
1447 | { | |
cab80f75 | 1448 | char *name = NULL; |
21b30f38 | 1449 | u_int next; |
2b87da3b | 1450 | |
188adeb2 | 1451 | /* Use a suitable default if we're passed a nil list. */ |
1452 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1453 | authlist = options.preferred_authentications; |
1454 | ||
1455 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1456 | debug3("start over, passed a different list %s", authlist); | |
1457 | if (supported != NULL) | |
1458 | xfree(supported); | |
1459 | supported = xstrdup(authlist); | |
1460 | preferred = options.preferred_authentications; | |
1461 | debug3("preferred %s", preferred); | |
1462 | current = NULL; | |
1463 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1464 | return current; | |
188adeb2 | 1465 | |
cab80f75 | 1466 | for (;;) { |
1467 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1468 | debug("No more authentication methods to try."); |
cab80f75 | 1469 | current = NULL; |
1470 | return NULL; | |
1471 | } | |
1472 | preferred += next; | |
94ec8c6b | 1473 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1474 | debug3("remaining preferred: %s", preferred); |
1475 | if ((current = authmethod_lookup(name)) != NULL && | |
1476 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1477 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1478 | debug("Next authentication method: %s", name); |
cab80f75 | 1479 | return current; |
94ec8c6b | 1480 | } |
a306f2dd | 1481 | } |
cab80f75 | 1482 | } |
a22aff1f | 1483 | |
ffb215be | 1484 | static char * |
cab80f75 | 1485 | authmethods_get(void) |
1486 | { | |
1487 | Authmethod *method = NULL; | |
3469eac4 | 1488 | Buffer b; |
1489 | char *list; | |
cab80f75 | 1490 | |
3469eac4 | 1491 | buffer_init(&b); |
cab80f75 | 1492 | for (method = authmethods; method->name != NULL; method++) { |
1493 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1494 | if (buffer_len(&b) > 0) |
1495 | buffer_append(&b, ",", 1); | |
1496 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1497 | } |
1498 | } | |
3469eac4 | 1499 | buffer_append(&b, "\0", 1); |
1500 | list = xstrdup(buffer_ptr(&b)); | |
1501 | buffer_free(&b); | |
1502 | return list; | |
a306f2dd | 1503 | } |