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028094f4 | 1 | /* $OpenBSD: sshconnect2.c,v 1.156 2006/07/11 20:07:25 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> |
33 | ||
751092f9 | 34 | #include "openbsd-compat/sys-queue.h" |
35 | ||
a306f2dd | 36 | #include "ssh.h" |
42f11eb2 | 37 | #include "ssh2.h" |
a306f2dd | 38 | #include "xmalloc.h" |
a306f2dd | 39 | #include "buffer.h" |
40 | #include "packet.h" | |
a306f2dd | 41 | #include "compat.h" |
a306f2dd | 42 | #include "bufaux.h" |
42f11eb2 | 43 | #include "cipher.h" |
a306f2dd | 44 | #include "kex.h" |
45 | #include "myproposal.h" | |
a306f2dd | 46 | #include "sshconnect.h" |
47 | #include "authfile.h" | |
db1cd2f3 | 48 | #include "dh.h" |
2e73a022 | 49 | #include "authfd.h" |
42f11eb2 | 50 | #include "log.h" |
51 | #include "readconf.h" | |
58ae9cb8 | 52 | #include "misc.h" |
cab80f75 | 53 | #include "match.h" |
a5c9ffdb | 54 | #include "dispatch.h" |
8002af61 | 55 | #include "canohost.h" |
39c00dc2 | 56 | #include "msg.h" |
57 | #include "pathnames.h" | |
82aeee5d | 58 | #include "uidswap.h" |
94ec8c6b | 59 | |
7364bd04 | 60 | #ifdef GSSAPI |
61 | #include "ssh-gss.h" | |
62 | #endif | |
63 | ||
a306f2dd | 64 | /* import */ |
65 | extern char *client_version_string; | |
66 | extern char *server_version_string; | |
67 | extern Options options; | |
68 | ||
69 | /* | |
70 | * SSH2 key exchange | |
71 | */ | |
72 | ||
1e3b8b07 | 73 | u_char *session_id2 = NULL; |
a27002e5 | 74 | u_int session_id2_len = 0; |
a306f2dd | 75 | |
a5c9ffdb | 76 | char *xxx_host; |
77 | struct sockaddr *xxx_hostaddr; | |
78 | ||
e092ce67 | 79 | Kex *xxx_kex = NULL; |
80 | ||
396c147e | 81 | static int |
f49bc4f7 | 82 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 83 | { |
f49bc4f7 | 84 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 85 | fatal("Host key verification failed."); |
a5c9ffdb | 86 | return 0; |
87 | } | |
88 | ||
a306f2dd | 89 | void |
94ec8c6b | 90 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
91 | { | |
94ec8c6b | 92 | Kex *kex; |
a5c9ffdb | 93 | |
94 | xxx_host = host; | |
95 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 96 | |
c523303b | 97 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 98 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 99 | options.ciphers = NULL; |
94ec8c6b | 100 | } |
101 | if (options.ciphers != NULL) { | |
102 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
103 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
104 | } | |
1ad64a93 | 105 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
106 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
107 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
108 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 109 | if (options.compression) { |
b2552997 | 110 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 111 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 112 | } else { |
b2552997 | 113 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 114 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 115 | } |
b2552997 | 116 | if (options.macs != NULL) { |
117 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
118 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
119 | } | |
e961a8f9 | 120 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 121 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 122 | options.hostkeyalgorithms; |
94ec8c6b | 123 | |
ffd7b36b | 124 | if (options.rekey_limit) |
125 | packet_set_rekey_limit(options.rekey_limit); | |
126 | ||
7a37c112 | 127 | /* start key exchange */ |
d8ee838b | 128 | kex = kex_setup(myproposal); |
98a58eda | 129 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 130 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 131 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 132 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 133 | kex->client_version_string=client_version_string; |
134 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 135 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 136 | |
e092ce67 | 137 | xxx_kex = kex; |
138 | ||
c422989b | 139 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 140 | |
d1ac6175 | 141 | session_id2 = kex->session_id; |
142 | session_id2_len = kex->session_id_len; | |
143 | ||
94ec8c6b | 144 | #ifdef DEBUG_KEXDH |
145 | /* send 1st encrypted/maced/compressed message */ | |
146 | packet_start(SSH2_MSG_IGNORE); | |
147 | packet_put_cstring("markus"); | |
148 | packet_send(); | |
149 | packet_write_wait(); | |
150 | #endif | |
a306f2dd | 151 | } |
71276795 | 152 | |
a306f2dd | 153 | /* |
154 | * Authenticate user | |
155 | */ | |
188adeb2 | 156 | |
157 | typedef struct Authctxt Authctxt; | |
158 | typedef struct Authmethod Authmethod; | |
43348518 | 159 | typedef struct identity Identity; |
160 | typedef struct idlist Idlist; | |
161 | ||
162 | struct identity { | |
163 | TAILQ_ENTRY(identity) next; | |
164 | AuthenticationConnection *ac; /* set if agent supports key */ | |
165 | Key *key; /* public/private key */ | |
166 | char *filename; /* comment for agent-only keys */ | |
167 | int tried; | |
168 | int isprivate; /* key points to the private key */ | |
169 | }; | |
170 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 171 | |
172 | struct Authctxt { | |
173 | const char *server_user; | |
8002af61 | 174 | const char *local_user; |
188adeb2 | 175 | const char *host; |
176 | const char *service; | |
188adeb2 | 177 | Authmethod *method; |
94ec8c6b | 178 | int success; |
fee56204 | 179 | char *authlist; |
8002af61 | 180 | /* pubkey */ |
43348518 | 181 | Idlist keys; |
8002af61 | 182 | AuthenticationConnection *agent; |
183 | /* hostbased */ | |
39c00dc2 | 184 | Sensitive *sensitive; |
6b759005 | 185 | /* kbd-interactive */ |
186 | int info_req_seen; | |
7364bd04 | 187 | /* generic */ |
188 | void *methoddata; | |
188adeb2 | 189 | }; |
190 | struct Authmethod { | |
191 | char *name; /* string to compare against server's list */ | |
192 | int (*userauth)(Authctxt *authctxt); | |
193 | int *enabled; /* flag in option struct that enables method */ | |
194 | int *batch_flag; /* flag in option struct that disables method */ | |
195 | }; | |
196 | ||
7819b5c3 | 197 | void input_userauth_success(int, u_int32_t, void *); |
198 | void input_userauth_failure(int, u_int32_t, void *); | |
199 | void input_userauth_banner(int, u_int32_t, void *); | |
200 | void input_userauth_error(int, u_int32_t, void *); | |
201 | void input_userauth_info_req(int, u_int32_t, void *); | |
202 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 203 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 204 | |
d5bb9418 | 205 | int userauth_none(Authctxt *); |
206 | int userauth_pubkey(Authctxt *); | |
207 | int userauth_passwd(Authctxt *); | |
208 | int userauth_kbdint(Authctxt *); | |
209 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 210 | int userauth_kerberos(Authctxt *); |
188adeb2 | 211 | |
7364bd04 | 212 | #ifdef GSSAPI |
213 | int userauth_gssapi(Authctxt *authctxt); | |
214 | void input_gssapi_response(int type, u_int32_t, void *); | |
215 | void input_gssapi_token(int type, u_int32_t, void *); | |
216 | void input_gssapi_hash(int type, u_int32_t, void *); | |
217 | void input_gssapi_error(int, u_int32_t, void *); | |
218 | void input_gssapi_errtok(int, u_int32_t, void *); | |
219 | #endif | |
220 | ||
d5bb9418 | 221 | void userauth(Authctxt *, char *); |
fee56204 | 222 | |
43348518 | 223 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 224 | static void pubkey_prepare(Authctxt *); |
225 | static void pubkey_cleanup(Authctxt *); | |
226 | static Key *load_identity_file(char *); | |
fee56204 | 227 | |
396c147e | 228 | static Authmethod *authmethod_get(char *authlist); |
229 | static Authmethod *authmethod_lookup(const char *name); | |
230 | static char *authmethods_get(void); | |
188adeb2 | 231 | |
232 | Authmethod authmethods[] = { | |
7364bd04 | 233 | #ifdef GSSAPI |
0789992b | 234 | {"gssapi-with-mic", |
7364bd04 | 235 | userauth_gssapi, |
236 | &options.gss_authentication, | |
237 | NULL}, | |
238 | #endif | |
3398dda9 | 239 | {"hostbased", |
240 | userauth_hostbased, | |
241 | &options.hostbased_authentication, | |
242 | NULL}, | |
9f37c0af | 243 | {"publickey", |
244 | userauth_pubkey, | |
245 | &options.pubkey_authentication, | |
246 | NULL}, | |
94ec8c6b | 247 | {"keyboard-interactive", |
248 | userauth_kbdint, | |
249 | &options.kbd_interactive_authentication, | |
250 | &options.batch_mode}, | |
9f37c0af | 251 | {"password", |
252 | userauth_passwd, | |
253 | &options.password_authentication, | |
254 | &options.batch_mode}, | |
94ec8c6b | 255 | {"none", |
256 | userauth_none, | |
257 | NULL, | |
258 | NULL}, | |
188adeb2 | 259 | {NULL, NULL, NULL, NULL} |
260 | }; | |
261 | ||
262 | void | |
8002af61 | 263 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 264 | Sensitive *sensitive) |
188adeb2 | 265 | { |
266 | Authctxt authctxt; | |
267 | int type; | |
188adeb2 | 268 | |
5ba55ada | 269 | if (options.challenge_response_authentication) |
d464095c | 270 | options.kbd_interactive_authentication = 1; |
271 | ||
188adeb2 | 272 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
273 | packet_put_cstring("ssh-userauth"); | |
274 | packet_send(); | |
a77673cc | 275 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 276 | packet_write_wait(); |
54a5250f | 277 | type = packet_read(); |
a77673cc | 278 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
279 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 280 | if (packet_remaining() > 0) { |
54a5250f | 281 | char *reply = packet_get_string(NULL); |
a77673cc | 282 | debug2("service_accept: %s", reply); |
188adeb2 | 283 | xfree(reply); |
188adeb2 | 284 | } else { |
6226a8f8 | 285 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 286 | } |
95500969 | 287 | packet_check_eom(); |
a77673cc | 288 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 289 | |
cab80f75 | 290 | if (options.preferred_authentications == NULL) |
291 | options.preferred_authentications = authmethods_get(); | |
292 | ||
188adeb2 | 293 | /* setup authentication context */ |
6b759005 | 294 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 295 | pubkey_prepare(&authctxt); |
188adeb2 | 296 | authctxt.server_user = server_user; |
8002af61 | 297 | authctxt.local_user = local_user; |
188adeb2 | 298 | authctxt.host = host; |
299 | authctxt.service = "ssh-connection"; /* service name */ | |
300 | authctxt.success = 0; | |
94ec8c6b | 301 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 302 | authctxt.authlist = NULL; |
7364bd04 | 303 | authctxt.methoddata = NULL; |
39c00dc2 | 304 | authctxt.sensitive = sensitive; |
6b759005 | 305 | authctxt.info_req_seen = 0; |
94ec8c6b | 306 | if (authctxt.method == NULL) |
307 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 308 | |
309 | /* initial userauth request */ | |
94ec8c6b | 310 | userauth_none(&authctxt); |
188adeb2 | 311 | |
7a37c112 | 312 | dispatch_init(&input_userauth_error); |
188adeb2 | 313 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
314 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 315 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 316 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
317 | ||
43348518 | 318 | pubkey_cleanup(&authctxt); |
b8c2031b | 319 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
320 | ||
6226a8f8 | 321 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 322 | } |
b8c2031b | 323 | |
188adeb2 | 324 | void |
fee56204 | 325 | userauth(Authctxt *authctxt, char *authlist) |
326 | { | |
7364bd04 | 327 | if (authctxt->methoddata) { |
328 | xfree(authctxt->methoddata); | |
329 | authctxt->methoddata = NULL; | |
330 | } | |
fee56204 | 331 | if (authlist == NULL) { |
332 | authlist = authctxt->authlist; | |
333 | } else { | |
334 | if (authctxt->authlist) | |
335 | xfree(authctxt->authlist); | |
336 | authctxt->authlist = authlist; | |
337 | } | |
338 | for (;;) { | |
339 | Authmethod *method = authmethod_get(authlist); | |
340 | if (method == NULL) | |
341 | fatal("Permission denied (%s).", authlist); | |
342 | authctxt->method = method; | |
b8c2031b | 343 | |
344 | /* reset the per method handler */ | |
345 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
346 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
347 | ||
348 | /* and try new method */ | |
fee56204 | 349 | if (method->userauth(authctxt) != 0) { |
350 | debug2("we sent a %s packet, wait for reply", method->name); | |
351 | break; | |
352 | } else { | |
353 | debug2("we did not send a packet, disable method"); | |
354 | method->enabled = NULL; | |
355 | } | |
356 | } | |
357 | } | |
d6133f43 | 358 | |
fee56204 | 359 | void |
7819b5c3 | 360 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 361 | { |
9616313f | 362 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 363 | "type %d", type); |
9616313f | 364 | } |
d6133f43 | 365 | |
9616313f | 366 | void |
7819b5c3 | 367 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 368 | { |
369 | char *msg, *lang; | |
c8f0cf13 | 370 | |
9616313f | 371 | debug3("input_userauth_banner"); |
372 | msg = packet_get_string(NULL); | |
373 | lang = packet_get_string(NULL); | |
19e633e7 | 374 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
375 | fprintf(stderr, "%s", msg); | |
9616313f | 376 | xfree(msg); |
377 | xfree(lang); | |
188adeb2 | 378 | } |
d6133f43 | 379 | |
188adeb2 | 380 | void |
7819b5c3 | 381 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 382 | { |
383 | Authctxt *authctxt = ctxt; | |
384 | if (authctxt == NULL) | |
385 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 386 | if (authctxt->authlist) { |
fee56204 | 387 | xfree(authctxt->authlist); |
c8f0cf13 | 388 | authctxt->authlist = NULL; |
389 | } | |
390 | if (authctxt->methoddata) { | |
7364bd04 | 391 | xfree(authctxt->methoddata); |
c8f0cf13 | 392 | authctxt->methoddata = NULL; |
393 | } | |
188adeb2 | 394 | authctxt->success = 1; /* break out */ |
395 | } | |
d6133f43 | 396 | |
188adeb2 | 397 | void |
7819b5c3 | 398 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 399 | { |
188adeb2 | 400 | Authctxt *authctxt = ctxt; |
401 | char *authlist = NULL; | |
402 | int partial; | |
188adeb2 | 403 | |
404 | if (authctxt == NULL) | |
405 | fatal("input_userauth_failure: no authentication context"); | |
406 | ||
94ec8c6b | 407 | authlist = packet_get_string(NULL); |
188adeb2 | 408 | partial = packet_get_char(); |
95500969 | 409 | packet_check_eom(); |
188adeb2 | 410 | |
411 | if (partial != 0) | |
bbe88b6d | 412 | logit("Authenticated with partial success."); |
6226a8f8 | 413 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 414 | |
fee56204 | 415 | userauth(authctxt, authlist); |
416 | } | |
417 | void | |
7819b5c3 | 418 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 419 | { |
420 | Authctxt *authctxt = ctxt; | |
421 | Key *key = NULL; | |
43348518 | 422 | Identity *id = NULL; |
fee56204 | 423 | Buffer b; |
c66f9d0e | 424 | int pktype, sent = 0; |
425 | u_int alen, blen; | |
426 | char *pkalg, *fp; | |
427 | u_char *pkblob; | |
fee56204 | 428 | |
429 | if (authctxt == NULL) | |
430 | fatal("input_userauth_pk_ok: no authentication context"); | |
431 | if (datafellows & SSH_BUG_PKOK) { | |
432 | /* this is similar to SSH_BUG_PKAUTH */ | |
433 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
434 | pkblob = packet_get_string(&blen); | |
435 | buffer_init(&b); | |
436 | buffer_append(&b, pkblob, blen); | |
437 | pkalg = buffer_get_string(&b, &alen); | |
438 | buffer_free(&b); | |
439 | } else { | |
440 | pkalg = packet_get_string(&alen); | |
441 | pkblob = packet_get_string(&blen); | |
442 | } | |
95500969 | 443 | packet_check_eom(); |
fee56204 | 444 | |
43348518 | 445 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 446 | |
43348518 | 447 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
448 | debug("unknown pkalg %s", pkalg); | |
449 | goto done; | |
450 | } | |
451 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
452 | debug("no key from blob. pkalg %s", pkalg); | |
453 | goto done; | |
454 | } | |
455 | if (key->type != pktype) { | |
456 | error("input_userauth_pk_ok: type mismatch " | |
457 | "for decoded key (received %d, expected %d)", | |
458 | key->type, pktype); | |
459 | goto done; | |
460 | } | |
461 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
462 | debug2("input_userauth_pk_ok: fp %s", fp); | |
463 | xfree(fp); | |
464 | ||
b56e99e2 | 465 | /* |
466 | * search keys in the reverse order, because last candidate has been | |
467 | * moved to the end of the queue. this also avoids confusion by | |
468 | * duplicate keys | |
469 | */ | |
484b2208 | 470 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 471 | if (key_equal(key, id->key)) { |
472 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 473 | break; |
474 | } | |
43348518 | 475 | } |
476 | done: | |
fee56204 | 477 | if (key != NULL) |
478 | key_free(key); | |
479 | xfree(pkalg); | |
480 | xfree(pkblob); | |
481 | ||
343288b8 | 482 | /* try another method if we did not send a packet */ |
fee56204 | 483 | if (sent == 0) |
484 | userauth(authctxt, NULL); | |
188adeb2 | 485 | } |
486 | ||
7364bd04 | 487 | #ifdef GSSAPI |
aff51935 | 488 | int |
7364bd04 | 489 | userauth_gssapi(Authctxt *authctxt) |
490 | { | |
491 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 492 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 493 | static u_int mech = 0; |
7364bd04 | 494 | OM_uint32 min; |
495 | int ok = 0; | |
496 | ||
497 | /* Try one GSSAPI method at a time, rather than sending them all at | |
498 | * once. */ | |
499 | ||
b0b30ca6 | 500 | if (gss_supported == NULL) |
501 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 502 | |
503 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 504 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 505 | if (gssctxt) |
506 | ssh_gssapi_delete_ctx(&gssctxt); | |
507 | ssh_gssapi_build_ctx(&gssctxt); | |
b0b30ca6 | 508 | ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]); |
7364bd04 | 509 | |
510 | /* My DER encoding requires length<128 */ | |
b0b30ca6 | 511 | if (gss_supported->elements[mech].length < 128 && |
7364bd04 | 512 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
513 | authctxt->host))) { | |
514 | ok = 1; /* Mechanism works */ | |
515 | } else { | |
516 | mech++; | |
517 | } | |
518 | } | |
519 | ||
18fc231c | 520 | if (!ok) { |
521 | ssh_gssapi_delete_ctx(&gssctxt); | |
2ceb8101 | 522 | return 0; |
18fc231c | 523 | } |
7364bd04 | 524 | |
525 | authctxt->methoddata=(void *)gssctxt; | |
526 | ||
527 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
528 | packet_put_cstring(authctxt->server_user); | |
529 | packet_put_cstring(authctxt->service); | |
530 | packet_put_cstring(authctxt->method->name); | |
531 | ||
532 | packet_put_int(1); | |
533 | ||
d8d9afd0 | 534 | packet_put_int((gss_supported->elements[mech].length) + 2); |
535 | packet_put_char(SSH_GSS_OIDTYPE); | |
536 | packet_put_char(gss_supported->elements[mech].length); | |
537 | packet_put_raw(gss_supported->elements[mech].elements, | |
538 | gss_supported->elements[mech].length); | |
7364bd04 | 539 | |
540 | packet_send(); | |
541 | ||
542 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
543 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
544 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
545 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
546 | ||
547 | mech++; /* Move along to next candidate */ | |
548 | ||
549 | return 1; | |
550 | } | |
551 | ||
b930668c | 552 | static OM_uint32 |
553 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
554 | { | |
555 | Authctxt *authctxt = ctxt; | |
556 | Gssctxt *gssctxt = authctxt->methoddata; | |
557 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 558 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
559 | gss_buffer_desc gssbuf; | |
0789992b | 560 | OM_uint32 status, ms, flags; |
561 | Buffer b; | |
b6453d99 | 562 | |
b930668c | 563 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 564 | recv_tok, &send_tok, &flags); |
b930668c | 565 | |
566 | if (send_tok.length > 0) { | |
567 | if (GSS_ERROR(status)) | |
568 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
569 | else | |
570 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 571 | |
b930668c | 572 | packet_put_string(send_tok.value, send_tok.length); |
573 | packet_send(); | |
574 | gss_release_buffer(&ms, &send_tok); | |
575 | } | |
b6453d99 | 576 | |
b930668c | 577 | if (status == GSS_S_COMPLETE) { |
0789992b | 578 | /* send either complete or MIC, depending on mechanism */ |
579 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
580 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
581 | packet_send(); | |
582 | } else { | |
583 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
584 | authctxt->service, "gssapi-with-mic"); | |
585 | ||
586 | gssbuf.value = buffer_ptr(&b); | |
587 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 588 | |
0789992b | 589 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 590 | |
0789992b | 591 | if (!GSS_ERROR(status)) { |
592 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
593 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 594 | |
0789992b | 595 | packet_send(); |
596 | } | |
b6453d99 | 597 | |
0789992b | 598 | buffer_free(&b); |
599 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 600 | } |
b930668c | 601 | } |
b6453d99 | 602 | |
b930668c | 603 | return status; |
604 | } | |
605 | ||
7364bd04 | 606 | void |
607 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
608 | { | |
609 | Authctxt *authctxt = ctxt; | |
610 | Gssctxt *gssctxt; | |
7364bd04 | 611 | int oidlen; |
612 | char *oidv; | |
7364bd04 | 613 | |
614 | if (authctxt == NULL) | |
615 | fatal("input_gssapi_response: no authentication context"); | |
616 | gssctxt = authctxt->methoddata; | |
617 | ||
618 | /* Setup our OID */ | |
619 | oidv = packet_get_string(&oidlen); | |
620 | ||
d8d9afd0 | 621 | if (oidlen <= 2 || |
622 | oidv[0] != SSH_GSS_OIDTYPE || | |
623 | oidv[1] != oidlen - 2) { | |
b930668c | 624 | xfree(oidv); |
d8d9afd0 | 625 | debug("Badly encoded mechanism OID received"); |
626 | userauth(authctxt, NULL); | |
d8d9afd0 | 627 | return; |
7364bd04 | 628 | } |
629 | ||
d8d9afd0 | 630 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
631 | fatal("Server returned different OID than expected"); | |
632 | ||
7364bd04 | 633 | packet_check_eom(); |
634 | ||
635 | xfree(oidv); | |
636 | ||
b930668c | 637 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 638 | /* Start again with next method on list */ |
639 | debug("Trying to start again"); | |
640 | userauth(authctxt, NULL); | |
641 | return; | |
642 | } | |
7364bd04 | 643 | } |
644 | ||
645 | void | |
646 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
647 | { | |
648 | Authctxt *authctxt = ctxt; | |
7364bd04 | 649 | gss_buffer_desc recv_tok; |
b930668c | 650 | OM_uint32 status; |
7364bd04 | 651 | u_int slen; |
652 | ||
653 | if (authctxt == NULL) | |
654 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 655 | |
656 | recv_tok.value = packet_get_string(&slen); | |
657 | recv_tok.length = slen; /* safe typecast */ | |
658 | ||
659 | packet_check_eom(); | |
660 | ||
b930668c | 661 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 662 | |
663 | xfree(recv_tok.value); | |
664 | ||
665 | if (GSS_ERROR(status)) { | |
7364bd04 | 666 | /* Start again with the next method in the list */ |
667 | userauth(authctxt, NULL); | |
668 | return; | |
669 | } | |
7364bd04 | 670 | } |
671 | ||
672 | void | |
673 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
674 | { | |
675 | Authctxt *authctxt = ctxt; | |
676 | Gssctxt *gssctxt; | |
677 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
678 | gss_buffer_desc recv_tok; | |
679 | OM_uint32 status, ms; | |
f99e1ca4 | 680 | u_int len; |
7364bd04 | 681 | |
682 | if (authctxt == NULL) | |
683 | fatal("input_gssapi_response: no authentication context"); | |
684 | gssctxt = authctxt->methoddata; | |
685 | ||
f99e1ca4 | 686 | recv_tok.value = packet_get_string(&len); |
687 | recv_tok.length = len; | |
7364bd04 | 688 | |
689 | packet_check_eom(); | |
690 | ||
691 | /* Stick it into GSSAPI and see what it says */ | |
692 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 693 | &recv_tok, &send_tok, NULL); |
7364bd04 | 694 | |
695 | xfree(recv_tok.value); | |
696 | gss_release_buffer(&ms, &send_tok); | |
697 | ||
698 | /* Server will be returning a failed packet after this one */ | |
699 | } | |
700 | ||
701 | void | |
702 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
703 | { | |
704 | OM_uint32 maj, min; | |
705 | char *msg; | |
706 | char *lang; | |
707 | ||
708 | maj=packet_get_int(); | |
709 | min=packet_get_int(); | |
710 | msg=packet_get_string(NULL); | |
711 | lang=packet_get_string(NULL); | |
712 | ||
713 | packet_check_eom(); | |
714 | ||
17318dd6 | 715 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 716 | xfree(msg); |
717 | xfree(lang); | |
718 | } | |
719 | #endif /* GSSAPI */ | |
720 | ||
94ec8c6b | 721 | int |
722 | userauth_none(Authctxt *authctxt) | |
723 | { | |
724 | /* initial userauth request */ | |
725 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
726 | packet_put_cstring(authctxt->server_user); | |
727 | packet_put_cstring(authctxt->service); | |
728 | packet_put_cstring(authctxt->method->name); | |
729 | packet_send(); | |
94ec8c6b | 730 | return 1; |
731 | } | |
732 | ||
a306f2dd | 733 | int |
188adeb2 | 734 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 735 | { |
1d1ffb87 | 736 | static int attempt = 0; |
67ec167d | 737 | char prompt[150]; |
a306f2dd | 738 | char *password; |
739 | ||
fa649821 | 740 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 741 | return 0; |
742 | ||
6aacefa7 | 743 | if (attempt != 1) |
fa649821 | 744 | error("Permission denied, please try again."); |
745 | ||
f72e01a5 | 746 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 747 | authctxt->server_user, authctxt->host); |
a306f2dd | 748 | password = read_passphrase(prompt, 0); |
749 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 750 | packet_put_cstring(authctxt->server_user); |
751 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 752 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 753 | packet_put_char(0); |
a6215e53 | 754 | packet_put_cstring(password); |
a306f2dd | 755 | memset(password, 0, strlen(password)); |
756 | xfree(password); | |
b4b701be | 757 | packet_add_padding(64); |
a306f2dd | 758 | packet_send(); |
67ec167d | 759 | |
7203d6bb | 760 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 761 | &input_userauth_passwd_changereq); |
762 | ||
a306f2dd | 763 | return 1; |
764 | } | |
67ec167d | 765 | /* |
766 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
767 | */ | |
768 | void | |
ef077e37 | 769 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 770 | { |
771 | Authctxt *authctxt = ctxt; | |
772 | char *info, *lang, *password = NULL, *retype = NULL; | |
773 | char prompt[150]; | |
774 | ||
775 | debug2("input_userauth_passwd_changereq"); | |
776 | ||
777 | if (authctxt == NULL) | |
778 | fatal("input_userauth_passwd_changereq: " | |
779 | "no authentication context"); | |
780 | ||
781 | info = packet_get_string(NULL); | |
782 | lang = packet_get_string(NULL); | |
783 | if (strlen(info) > 0) | |
bbe88b6d | 784 | logit("%s", info); |
67ec167d | 785 | xfree(info); |
786 | xfree(lang); | |
787 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
788 | packet_put_cstring(authctxt->server_user); | |
789 | packet_put_cstring(authctxt->service); | |
790 | packet_put_cstring(authctxt->method->name); | |
791 | packet_put_char(1); /* additional info */ | |
7203d6bb | 792 | snprintf(prompt, sizeof(prompt), |
67ec167d | 793 | "Enter %.30s@%.128s's old password: ", |
794 | authctxt->server_user, authctxt->host); | |
795 | password = read_passphrase(prompt, 0); | |
796 | packet_put_cstring(password); | |
797 | memset(password, 0, strlen(password)); | |
798 | xfree(password); | |
799 | password = NULL; | |
800 | while (password == NULL) { | |
7203d6bb | 801 | snprintf(prompt, sizeof(prompt), |
67ec167d | 802 | "Enter %.30s@%.128s's new password: ", |
803 | authctxt->server_user, authctxt->host); | |
804 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
805 | if (password == NULL) { | |
806 | /* bail out */ | |
807 | return; | |
808 | } | |
7203d6bb | 809 | snprintf(prompt, sizeof(prompt), |
67ec167d | 810 | "Retype %.30s@%.128s's new password: ", |
811 | authctxt->server_user, authctxt->host); | |
812 | retype = read_passphrase(prompt, 0); | |
813 | if (strcmp(password, retype) != 0) { | |
814 | memset(password, 0, strlen(password)); | |
815 | xfree(password); | |
bbe88b6d | 816 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 817 | password = NULL; |
818 | } | |
819 | memset(retype, 0, strlen(retype)); | |
820 | xfree(retype); | |
821 | } | |
822 | packet_put_cstring(password); | |
823 | memset(password, 0, strlen(password)); | |
824 | xfree(password); | |
825 | packet_add_padding(64); | |
826 | packet_send(); | |
7203d6bb | 827 | |
828 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 829 | &input_userauth_passwd_changereq); |
830 | } | |
a306f2dd | 831 | |
43348518 | 832 | static int |
833 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
834 | u_char *data, u_int datalen) | |
835 | { | |
836 | Key *prv; | |
837 | int ret; | |
838 | ||
839 | /* the agent supports this key */ | |
840 | if (id->ac) | |
841 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
842 | data, datalen)); | |
843 | /* | |
844 | * we have already loaded the private key or | |
845 | * the private key is stored in external hardware | |
846 | */ | |
847 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
848 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
849 | /* load the private key from the file */ | |
850 | if ((prv = load_identity_file(id->filename)) == NULL) | |
851 | return (-1); | |
852 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
853 | key_free(prv); | |
854 | return (ret); | |
fee56204 | 855 | } |
856 | ||
396c147e | 857 | static int |
43348518 | 858 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 859 | { |
860 | Buffer b; | |
1e3b8b07 | 861 | u_char *blob, *signature; |
c66f9d0e | 862 | u_int bloblen, slen; |
a27002e5 | 863 | u_int skip = 0; |
2e73a022 | 864 | int ret = -1; |
94ec8c6b | 865 | int have_sig = 1; |
a306f2dd | 866 | |
cbc5abf9 | 867 | debug3("sign_and_send_pubkey"); |
fee56204 | 868 | |
43348518 | 869 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 870 | /* we cannot handle this key */ |
cbc5abf9 | 871 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 872 | return 0; |
873 | } | |
a306f2dd | 874 | /* data to be signed */ |
875 | buffer_init(&b); | |
33de75a3 | 876 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 877 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 878 | skip = session_id2_len; |
33de75a3 | 879 | } else { |
880 | buffer_put_string(&b, session_id2, session_id2_len); | |
881 | skip = buffer_len(&b); | |
74fc9186 | 882 | } |
a306f2dd | 883 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 884 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 885 | buffer_put_cstring(&b, |
cbc5abf9 | 886 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 887 | "ssh-userauth" : |
188adeb2 | 888 | authctxt->service); |
cbc5abf9 | 889 | if (datafellows & SSH_BUG_PKAUTH) { |
890 | buffer_put_char(&b, have_sig); | |
891 | } else { | |
892 | buffer_put_cstring(&b, authctxt->method->name); | |
893 | buffer_put_char(&b, have_sig); | |
43348518 | 894 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 895 | } |
a306f2dd | 896 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 897 | |
898 | /* generate signature */ | |
43348518 | 899 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 900 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 901 | if (ret == -1) { |
902 | xfree(blob); | |
903 | buffer_free(&b); | |
904 | return 0; | |
905 | } | |
fa08c86b | 906 | #ifdef DEBUG_PK |
a306f2dd | 907 | buffer_dump(&b); |
908 | #endif | |
cbc5abf9 | 909 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 910 | buffer_clear(&b); |
911 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 912 | skip = session_id2_len; |
d0c832f3 | 913 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 914 | buffer_put_cstring(&b, authctxt->server_user); |
915 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 916 | buffer_put_cstring(&b, authctxt->method->name); |
917 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 918 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 919 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 920 | buffer_put_string(&b, blob, bloblen); |
921 | } | |
922 | xfree(blob); | |
fee56204 | 923 | |
a306f2dd | 924 | /* append signature */ |
925 | buffer_put_string(&b, signature, slen); | |
926 | xfree(signature); | |
927 | ||
928 | /* skip session id and packet type */ | |
74fc9186 | 929 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 930 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 931 | buffer_consume(&b, skip + 1); |
a306f2dd | 932 | |
933 | /* put remaining data from buffer into packet */ | |
934 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
935 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
936 | buffer_free(&b); | |
a306f2dd | 937 | packet_send(); |
2e73a022 | 938 | |
939 | return 1; | |
4c8722d9 | 940 | } |
941 | ||
396c147e | 942 | static int |
43348518 | 943 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 944 | { |
fee56204 | 945 | u_char *blob; |
21b30f38 | 946 | u_int bloblen, have_sig = 0; |
4c8722d9 | 947 | |
fee56204 | 948 | debug3("send_pubkey_test"); |
949 | ||
43348518 | 950 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 951 | /* we cannot handle this key */ |
952 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 953 | return 0; |
954 | } | |
fee56204 | 955 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 956 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 957 | |
fee56204 | 958 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
959 | packet_put_cstring(authctxt->server_user); | |
960 | packet_put_cstring(authctxt->service); | |
961 | packet_put_cstring(authctxt->method->name); | |
962 | packet_put_char(have_sig); | |
963 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 964 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 965 | packet_put_string(blob, bloblen); |
966 | xfree(blob); | |
967 | packet_send(); | |
968 | return 1; | |
969 | } | |
970 | ||
396c147e | 971 | static Key * |
fee56204 | 972 | load_identity_file(char *filename) |
973 | { | |
974 | Key *private; | |
975 | char prompt[300], *passphrase; | |
fc231518 | 976 | int perm_ok, quit, i; |
d156519a | 977 | struct stat st; |
fee56204 | 978 | |
d156519a | 979 | if (stat(filename, &st) < 0) { |
980 | debug3("no such identity: %s", filename); | |
981 | return NULL; | |
982 | } | |
fc231518 | 983 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
984 | if (!perm_ok) | |
985 | return NULL; | |
aeaa3d9e | 986 | if (private == NULL) { |
987 | if (options.batch_mode) | |
fee56204 | 988 | return NULL; |
4c8722d9 | 989 | snprintf(prompt, sizeof prompt, |
184eed6a | 990 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 991 | for (i = 0; i < options.number_of_password_prompts; i++) { |
992 | passphrase = read_passphrase(prompt, 0); | |
993 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 994 | private = key_load_private_type(KEY_UNSPEC, |
995 | filename, passphrase, NULL, NULL); | |
fee56204 | 996 | quit = 0; |
188adeb2 | 997 | } else { |
998 | debug2("no passphrase given, try next key"); | |
fee56204 | 999 | quit = 1; |
188adeb2 | 1000 | } |
1001 | memset(passphrase, 0, strlen(passphrase)); | |
1002 | xfree(passphrase); | |
aeaa3d9e | 1003 | if (private != NULL || quit) |
188adeb2 | 1004 | break; |
1005 | debug2("bad passphrase given, try again..."); | |
1006 | } | |
4c8722d9 | 1007 | } |
fee56204 | 1008 | return private; |
1009 | } | |
1010 | ||
43348518 | 1011 | /* |
1012 | * try keys in the following order: | |
1013 | * 1. agent keys that are found in the config file | |
1014 | * 2. other agent keys | |
1015 | * 3. keys that are only listed in the config file | |
1016 | */ | |
1017 | static void | |
1018 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1019 | { |
43348518 | 1020 | Identity *id; |
1021 | Idlist agent, files, *preferred; | |
1022 | Key *key; | |
1023 | AuthenticationConnection *ac; | |
1024 | char *comment; | |
1025 | int i, found; | |
1026 | ||
1027 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1028 | TAILQ_INIT(&files); /* keys from the config file */ | |
1029 | preferred = &authctxt->keys; | |
1030 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1031 | ||
1032 | /* list of keys stored in the filesystem */ | |
1033 | for (i = 0; i < options.num_identity_files; i++) { | |
1034 | key = options.identity_keys[i]; | |
1035 | if (key && key->type == KEY_RSA1) | |
1036 | continue; | |
1037 | options.identity_keys[i] = NULL; | |
52e3daed | 1038 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1039 | id->key = key; |
1040 | id->filename = xstrdup(options.identity_files[i]); | |
1041 | TAILQ_INSERT_TAIL(&files, id, next); | |
1042 | } | |
1043 | /* list of keys supported by the agent */ | |
1044 | if ((ac = ssh_get_authentication_connection())) { | |
1045 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1046 | key != NULL; | |
1047 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1048 | found = 0; | |
1049 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1050 | /* agent keys from the config file are preferred */ |
43348518 | 1051 | if (key_equal(key, id->key)) { |
1052 | key_free(key); | |
1053 | xfree(comment); | |
1054 | TAILQ_REMOVE(&files, id, next); | |
1055 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1056 | id->ac = ac; | |
1057 | found = 1; | |
1058 | break; | |
1059 | } | |
1060 | } | |
3a065ed0 | 1061 | if (!found && !options.identities_only) { |
52e3daed | 1062 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1063 | id->key = key; |
1064 | id->filename = comment; | |
1065 | id->ac = ac; | |
1066 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1067 | } | |
1068 | } | |
1069 | /* append remaining agent keys */ | |
1070 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1071 | TAILQ_REMOVE(&agent, id, next); | |
1072 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1073 | } | |
1074 | authctxt->agent = ac; | |
1075 | } | |
1076 | /* append remaining keys from the config file */ | |
1077 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1078 | TAILQ_REMOVE(&files, id, next); | |
1079 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1080 | } | |
1081 | TAILQ_FOREACH(id, preferred, next) { | |
1082 | debug2("key: %s (%p)", id->filename, id->key); | |
1083 | } | |
fee56204 | 1084 | } |
1085 | ||
43348518 | 1086 | static void |
1087 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1088 | { |
43348518 | 1089 | Identity *id; |
1090 | ||
1091 | if (authctxt->agent != NULL) | |
1092 | ssh_close_authentication_connection(authctxt->agent); | |
1093 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1094 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1095 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1096 | if (id->key) | |
1097 | key_free(id->key); | |
1098 | if (id->filename) | |
1099 | xfree(id->filename); | |
1100 | xfree(id); | |
2e73a022 | 1101 | } |
a306f2dd | 1102 | } |
1103 | ||
188adeb2 | 1104 | int |
1105 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1106 | { |
43348518 | 1107 | Identity *id; |
188adeb2 | 1108 | int sent = 0; |
1109 | ||
43348518 | 1110 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1111 | if (id->tried++) | |
1112 | return (0); | |
b56e99e2 | 1113 | /* move key to the end of the queue */ |
43348518 | 1114 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1115 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1116 | /* | |
1117 | * send a test message if we have the public key. for | |
1118 | * encrypted keys we cannot do this and have to load the | |
1119 | * private key instead | |
1120 | */ | |
1121 | if (id->key && id->key->type != KEY_RSA1) { | |
1122 | debug("Offering public key: %s", id->filename); | |
1123 | sent = send_pubkey_test(authctxt, id); | |
1124 | } else if (id->key == NULL) { | |
1125 | debug("Trying private key: %s", id->filename); | |
1126 | id->key = load_identity_file(id->filename); | |
1127 | if (id->key != NULL) { | |
1128 | id->isprivate = 1; | |
1129 | sent = sign_and_send_pubkey(authctxt, id); | |
1130 | key_free(id->key); | |
1131 | id->key = NULL; | |
fee56204 | 1132 | } |
fee56204 | 1133 | } |
43348518 | 1134 | if (sent) |
1135 | return (sent); | |
fa08c86b | 1136 | } |
43348518 | 1137 | return (0); |
188adeb2 | 1138 | } |
a306f2dd | 1139 | |
94ec8c6b | 1140 | /* |
1141 | * Send userauth request message specifying keyboard-interactive method. | |
1142 | */ | |
1143 | int | |
1144 | userauth_kbdint(Authctxt *authctxt) | |
1145 | { | |
1146 | static int attempt = 0; | |
1147 | ||
1148 | if (attempt++ >= options.number_of_password_prompts) | |
1149 | return 0; | |
6b759005 | 1150 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1151 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1152 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1153 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1154 | return 0; | |
1155 | } | |
94ec8c6b | 1156 | |
1157 | debug2("userauth_kbdint"); | |
1158 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1159 | packet_put_cstring(authctxt->server_user); | |
1160 | packet_put_cstring(authctxt->service); | |
1161 | packet_put_cstring(authctxt->method->name); | |
1162 | packet_put_cstring(""); /* lang */ | |
1163 | packet_put_cstring(options.kbd_interactive_devices ? | |
1164 | options.kbd_interactive_devices : ""); | |
1165 | packet_send(); | |
94ec8c6b | 1166 | |
1167 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1168 | return 1; | |
1169 | } | |
1170 | ||
1171 | /* | |
f72e01a5 | 1172 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1173 | */ |
1174 | void | |
7819b5c3 | 1175 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1176 | { |
1177 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1178 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1179 | u_int num_prompts, i; |
94ec8c6b | 1180 | int echo = 0; |
1181 | ||
1182 | debug2("input_userauth_info_req"); | |
1183 | ||
1184 | if (authctxt == NULL) | |
1185 | fatal("input_userauth_info_req: no authentication context"); | |
1186 | ||
6b759005 | 1187 | authctxt->info_req_seen = 1; |
1188 | ||
94ec8c6b | 1189 | name = packet_get_string(NULL); |
1190 | inst = packet_get_string(NULL); | |
1191 | lang = packet_get_string(NULL); | |
94ec8c6b | 1192 | if (strlen(name) > 0) |
bbe88b6d | 1193 | logit("%s", name); |
94ec8c6b | 1194 | if (strlen(inst) > 0) |
bbe88b6d | 1195 | logit("%s", inst); |
f72e01a5 | 1196 | xfree(name); |
94ec8c6b | 1197 | xfree(inst); |
f72e01a5 | 1198 | xfree(lang); |
94ec8c6b | 1199 | |
1200 | num_prompts = packet_get_int(); | |
1201 | /* | |
1202 | * Begin to build info response packet based on prompts requested. | |
1203 | * We commit to providing the correct number of responses, so if | |
1204 | * further on we run into a problem that prevents this, we have to | |
1205 | * be sure and clean this up and send a correct error response. | |
1206 | */ | |
1207 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1208 | packet_put_int(num_prompts); | |
1209 | ||
5ba55ada | 1210 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1211 | for (i = 0; i < num_prompts; i++) { |
1212 | prompt = packet_get_string(NULL); | |
1213 | echo = packet_get_char(); | |
1214 | ||
1843a425 | 1215 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1216 | |
a6215e53 | 1217 | packet_put_cstring(response); |
94ec8c6b | 1218 | memset(response, 0, strlen(response)); |
1219 | xfree(response); | |
1220 | xfree(prompt); | |
1221 | } | |
95500969 | 1222 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1223 | |
b4b701be | 1224 | packet_add_padding(64); |
94ec8c6b | 1225 | packet_send(); |
94ec8c6b | 1226 | } |
a306f2dd | 1227 | |
39c00dc2 | 1228 | static int |
d6133f43 | 1229 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1230 | u_char *data, u_int datalen) |
1231 | { | |
1232 | Buffer b; | |
7091a26b | 1233 | struct stat st; |
39c00dc2 | 1234 | pid_t pid; |
d4826734 | 1235 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1236 | |
6226a8f8 | 1237 | debug2("ssh_keysign called"); |
39c00dc2 | 1238 | |
7091a26b | 1239 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1240 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1241 | return -1; | |
1242 | } | |
39c00dc2 | 1243 | if (fflush(stdout) != 0) |
1244 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1245 | if (pipe(to) < 0) { | |
1246 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1247 | return -1; | |
1248 | } | |
1249 | if (pipe(from) < 0) { | |
1250 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1251 | return -1; | |
1252 | } | |
1253 | if ((pid = fork()) < 0) { | |
1254 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1255 | return -1; | |
1256 | } | |
1257 | if (pid == 0) { | |
3c33c1b6 | 1258 | permanently_drop_suid(getuid()); |
39c00dc2 | 1259 | close(from[0]); |
1260 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1261 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1262 | close(to[1]); | |
1263 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1264 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1265 | close(from[1]); |
1266 | close(to[0]); | |
a3f69458 | 1267 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1268 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1269 | strerror(errno)); | |
1270 | } | |
1271 | close(from[1]); | |
1272 | close(to[0]); | |
1273 | ||
1274 | buffer_init(&b); | |
d4826734 | 1275 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1276 | buffer_put_string(&b, data, datalen); |
d3cbe6f8 | 1277 | if (ssh_msg_send(to[1], version, &b) == -1) |
1278 | fatal("ssh_keysign: couldn't send request"); | |
39c00dc2 | 1279 | |
e987fdbe | 1280 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1281 | error("ssh_keysign: no reply"); |
43f7a4b8 | 1282 | buffer_free(&b); |
39c00dc2 | 1283 | return -1; |
1284 | } | |
39c00dc2 | 1285 | close(from[0]); |
1286 | close(to[1]); | |
1287 | ||
d4826734 | 1288 | while (waitpid(pid, &status, 0) < 0) |
1289 | if (errno != EINTR) | |
1290 | break; | |
39c00dc2 | 1291 | |
7091a26b | 1292 | if (buffer_get_char(&b) != version) { |
1293 | error("ssh_keysign: bad version"); | |
43f7a4b8 | 1294 | buffer_free(&b); |
7091a26b | 1295 | return -1; |
1296 | } | |
1297 | *sigp = buffer_get_string(&b, lenp); | |
43f7a4b8 | 1298 | buffer_free(&b); |
7091a26b | 1299 | |
39c00dc2 | 1300 | return 0; |
1301 | } | |
1302 | ||
8002af61 | 1303 | int |
1304 | userauth_hostbased(Authctxt *authctxt) | |
1305 | { | |
1306 | Key *private = NULL; | |
39c00dc2 | 1307 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1308 | Buffer b; |
1309 | u_char *signature, *blob; | |
1310 | char *chost, *pkalg, *p; | |
8dddf799 | 1311 | const char *service; |
8002af61 | 1312 | u_int blen, slen; |
f98c3421 | 1313 | int ok, i, len, found = 0; |
8002af61 | 1314 | |
8002af61 | 1315 | /* check for a useful key */ |
39c00dc2 | 1316 | for (i = 0; i < sensitive->nkeys; i++) { |
1317 | private = sensitive->keys[i]; | |
8002af61 | 1318 | if (private && private->type != KEY_RSA1) { |
1319 | found = 1; | |
1320 | /* we take and free the key */ | |
39c00dc2 | 1321 | sensitive->keys[i] = NULL; |
8002af61 | 1322 | break; |
1323 | } | |
1324 | } | |
1325 | if (!found) { | |
6226a8f8 | 1326 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1327 | return 0; |
1328 | } | |
1329 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1330 | key_free(private); | |
8002af61 | 1331 | return 0; |
1332 | } | |
e8d59b4d | 1333 | /* figure out a name for the client host */ |
1334 | p = get_local_name(packet_get_connection_in()); | |
1335 | if (p == NULL) { | |
1336 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1337 | key_free(private); | |
18fc231c | 1338 | xfree(blob); |
e8d59b4d | 1339 | return 0; |
1340 | } | |
1341 | len = strlen(p) + 2; | |
52e3daed | 1342 | xasprintf(&chost, "%s.", p); |
e8d59b4d | 1343 | debug2("userauth_hostbased: chost %s", chost); |
3e2f2431 | 1344 | xfree(p); |
e8d59b4d | 1345 | |
8dddf799 | 1346 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1347 | authctxt->service; | |
8002af61 | 1348 | pkalg = xstrdup(key_ssh_name(private)); |
1349 | buffer_init(&b); | |
8002af61 | 1350 | /* construct data */ |
8dddf799 | 1351 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1352 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1353 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1354 | buffer_put_cstring(&b, service); |
8002af61 | 1355 | buffer_put_cstring(&b, authctxt->method->name); |
1356 | buffer_put_cstring(&b, pkalg); | |
1357 | buffer_put_string(&b, blob, blen); | |
1358 | buffer_put_cstring(&b, chost); | |
1359 | buffer_put_cstring(&b, authctxt->local_user); | |
1360 | #ifdef DEBUG_PK | |
1361 | buffer_dump(&b); | |
1362 | #endif | |
39c00dc2 | 1363 | if (sensitive->external_keysign) |
1364 | ok = ssh_keysign(private, &signature, &slen, | |
1365 | buffer_ptr(&b), buffer_len(&b)); | |
1366 | else | |
1367 | ok = key_sign(private, &signature, &slen, | |
1368 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1369 | key_free(private); |
1370 | buffer_free(&b); | |
1371 | if (ok != 0) { | |
1372 | error("key_sign failed"); | |
1373 | xfree(chost); | |
1374 | xfree(pkalg); | |
18fc231c | 1375 | xfree(blob); |
8002af61 | 1376 | return 0; |
1377 | } | |
1378 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1379 | packet_put_cstring(authctxt->server_user); | |
1380 | packet_put_cstring(authctxt->service); | |
1381 | packet_put_cstring(authctxt->method->name); | |
1382 | packet_put_cstring(pkalg); | |
1383 | packet_put_string(blob, blen); | |
1384 | packet_put_cstring(chost); | |
1385 | packet_put_cstring(authctxt->local_user); | |
1386 | packet_put_string(signature, slen); | |
1387 | memset(signature, 's', slen); | |
1388 | xfree(signature); | |
1389 | xfree(chost); | |
1390 | xfree(pkalg); | |
18fc231c | 1391 | xfree(blob); |
8002af61 | 1392 | |
1393 | packet_send(); | |
1394 | return 1; | |
1395 | } | |
1396 | ||
188adeb2 | 1397 | /* find auth method */ |
1398 | ||
188adeb2 | 1399 | /* |
1400 | * given auth method name, if configurable options permit this method fill | |
1401 | * in auth_ident field and return true, otherwise return false. | |
1402 | */ | |
396c147e | 1403 | static int |
188adeb2 | 1404 | authmethod_is_enabled(Authmethod *method) |
1405 | { | |
1406 | if (method == NULL) | |
1407 | return 0; | |
1408 | /* return false if options indicate this method is disabled */ | |
1409 | if (method->enabled == NULL || *method->enabled == 0) | |
1410 | return 0; | |
1411 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1412 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1413 | return 0; | |
1414 | return 1; | |
1415 | } | |
a306f2dd | 1416 | |
396c147e | 1417 | static Authmethod * |
188adeb2 | 1418 | authmethod_lookup(const char *name) |
1419 | { | |
1420 | Authmethod *method = NULL; | |
1421 | if (name != NULL) | |
1422 | for (method = authmethods; method->name != NULL; method++) | |
1423 | if (strcmp(name, method->name) == 0) | |
1424 | return method; | |
1425 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1426 | return NULL; | |
1427 | } | |
1428 | ||
cab80f75 | 1429 | /* XXX internal state */ |
1430 | static Authmethod *current = NULL; | |
1431 | static char *supported = NULL; | |
1432 | static char *preferred = NULL; | |
d6133f43 | 1433 | |
188adeb2 | 1434 | /* |
1435 | * Given the authentication method list sent by the server, return the | |
1436 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1437 | * use a built-in default list. |
2b87da3b | 1438 | */ |
396c147e | 1439 | static Authmethod * |
188adeb2 | 1440 | authmethod_get(char *authlist) |
1441 | { | |
cab80f75 | 1442 | char *name = NULL; |
21b30f38 | 1443 | u_int next; |
2b87da3b | 1444 | |
188adeb2 | 1445 | /* Use a suitable default if we're passed a nil list. */ |
1446 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1447 | authlist = options.preferred_authentications; |
1448 | ||
1449 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1450 | debug3("start over, passed a different list %s", authlist); | |
1451 | if (supported != NULL) | |
1452 | xfree(supported); | |
1453 | supported = xstrdup(authlist); | |
1454 | preferred = options.preferred_authentications; | |
1455 | debug3("preferred %s", preferred); | |
1456 | current = NULL; | |
1457 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1458 | return current; | |
188adeb2 | 1459 | |
cab80f75 | 1460 | for (;;) { |
1461 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1462 | debug("No more authentication methods to try."); |
cab80f75 | 1463 | current = NULL; |
1464 | return NULL; | |
1465 | } | |
1466 | preferred += next; | |
94ec8c6b | 1467 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1468 | debug3("remaining preferred: %s", preferred); |
1469 | if ((current = authmethod_lookup(name)) != NULL && | |
1470 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1471 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1472 | debug("Next authentication method: %s", name); |
cab80f75 | 1473 | return current; |
94ec8c6b | 1474 | } |
a306f2dd | 1475 | } |
cab80f75 | 1476 | } |
a22aff1f | 1477 | |
ffb215be | 1478 | static char * |
cab80f75 | 1479 | authmethods_get(void) |
1480 | { | |
1481 | Authmethod *method = NULL; | |
3469eac4 | 1482 | Buffer b; |
1483 | char *list; | |
cab80f75 | 1484 | |
3469eac4 | 1485 | buffer_init(&b); |
cab80f75 | 1486 | for (method = authmethods; method->name != NULL; method++) { |
1487 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1488 | if (buffer_len(&b) > 0) |
1489 | buffer_append(&b, ",", 1); | |
1490 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1491 | } |
1492 | } | |
3469eac4 | 1493 | buffer_append(&b, "\0", 1); |
1494 | list = xstrdup(buffer_ptr(&b)); | |
1495 | buffer_free(&b); | |
1496 | return list; | |
a306f2dd | 1497 | } |