]>
Commit | Line | Data |
---|---|---|
82aeee5d | 1 | /* $OpenBSD: sshconnect2.c,v 1.154 2006/06/06 10:20:20 markus 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 | |
751092f9 | 32 | #include "openbsd-compat/sys-queue.h" |
33 | ||
a306f2dd | 34 | #include "ssh.h" |
42f11eb2 | 35 | #include "ssh2.h" |
a306f2dd | 36 | #include "xmalloc.h" |
a306f2dd | 37 | #include "buffer.h" |
38 | #include "packet.h" | |
a306f2dd | 39 | #include "compat.h" |
a306f2dd | 40 | #include "bufaux.h" |
42f11eb2 | 41 | #include "cipher.h" |
a306f2dd | 42 | #include "kex.h" |
43 | #include "myproposal.h" | |
a306f2dd | 44 | #include "sshconnect.h" |
45 | #include "authfile.h" | |
db1cd2f3 | 46 | #include "dh.h" |
2e73a022 | 47 | #include "authfd.h" |
42f11eb2 | 48 | #include "log.h" |
49 | #include "readconf.h" | |
58ae9cb8 | 50 | #include "misc.h" |
cab80f75 | 51 | #include "match.h" |
a5c9ffdb | 52 | #include "dispatch.h" |
8002af61 | 53 | #include "canohost.h" |
39c00dc2 | 54 | #include "msg.h" |
55 | #include "pathnames.h" | |
82aeee5d | 56 | #include "uidswap.h" |
94ec8c6b | 57 | |
7364bd04 | 58 | #ifdef GSSAPI |
59 | #include "ssh-gss.h" | |
60 | #endif | |
61 | ||
a306f2dd | 62 | /* import */ |
63 | extern char *client_version_string; | |
64 | extern char *server_version_string; | |
65 | extern Options options; | |
66 | ||
67 | /* | |
68 | * SSH2 key exchange | |
69 | */ | |
70 | ||
1e3b8b07 | 71 | u_char *session_id2 = NULL; |
a27002e5 | 72 | u_int session_id2_len = 0; |
a306f2dd | 73 | |
a5c9ffdb | 74 | char *xxx_host; |
75 | struct sockaddr *xxx_hostaddr; | |
76 | ||
e092ce67 | 77 | Kex *xxx_kex = NULL; |
78 | ||
396c147e | 79 | static int |
f49bc4f7 | 80 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 81 | { |
f49bc4f7 | 82 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 83 | fatal("Host key verification failed."); |
a5c9ffdb | 84 | return 0; |
85 | } | |
86 | ||
a306f2dd | 87 | void |
94ec8c6b | 88 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
89 | { | |
94ec8c6b | 90 | Kex *kex; |
a5c9ffdb | 91 | |
92 | xxx_host = host; | |
93 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 94 | |
c523303b | 95 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 96 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 97 | options.ciphers = NULL; |
94ec8c6b | 98 | } |
99 | if (options.ciphers != NULL) { | |
100 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
101 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
102 | } | |
1ad64a93 | 103 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
104 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
105 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
106 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 107 | if (options.compression) { |
b2552997 | 108 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 109 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 110 | } else { |
b2552997 | 111 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 112 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 113 | } |
b2552997 | 114 | if (options.macs != NULL) { |
115 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
116 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
117 | } | |
e961a8f9 | 118 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 119 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 120 | options.hostkeyalgorithms; |
94ec8c6b | 121 | |
ffd7b36b | 122 | if (options.rekey_limit) |
123 | packet_set_rekey_limit(options.rekey_limit); | |
124 | ||
7a37c112 | 125 | /* start key exchange */ |
d8ee838b | 126 | kex = kex_setup(myproposal); |
98a58eda | 127 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 128 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 129 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 130 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 131 | kex->client_version_string=client_version_string; |
132 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 133 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 134 | |
e092ce67 | 135 | xxx_kex = kex; |
136 | ||
c422989b | 137 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 138 | |
d1ac6175 | 139 | session_id2 = kex->session_id; |
140 | session_id2_len = kex->session_id_len; | |
141 | ||
94ec8c6b | 142 | #ifdef DEBUG_KEXDH |
143 | /* send 1st encrypted/maced/compressed message */ | |
144 | packet_start(SSH2_MSG_IGNORE); | |
145 | packet_put_cstring("markus"); | |
146 | packet_send(); | |
147 | packet_write_wait(); | |
148 | #endif | |
a306f2dd | 149 | } |
71276795 | 150 | |
a306f2dd | 151 | /* |
152 | * Authenticate user | |
153 | */ | |
188adeb2 | 154 | |
155 | typedef struct Authctxt Authctxt; | |
156 | typedef struct Authmethod Authmethod; | |
43348518 | 157 | typedef struct identity Identity; |
158 | typedef struct idlist Idlist; | |
159 | ||
160 | struct identity { | |
161 | TAILQ_ENTRY(identity) next; | |
162 | AuthenticationConnection *ac; /* set if agent supports key */ | |
163 | Key *key; /* public/private key */ | |
164 | char *filename; /* comment for agent-only keys */ | |
165 | int tried; | |
166 | int isprivate; /* key points to the private key */ | |
167 | }; | |
168 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 169 | |
170 | struct Authctxt { | |
171 | const char *server_user; | |
8002af61 | 172 | const char *local_user; |
188adeb2 | 173 | const char *host; |
174 | const char *service; | |
188adeb2 | 175 | Authmethod *method; |
94ec8c6b | 176 | int success; |
fee56204 | 177 | char *authlist; |
8002af61 | 178 | /* pubkey */ |
43348518 | 179 | Idlist keys; |
8002af61 | 180 | AuthenticationConnection *agent; |
181 | /* hostbased */ | |
39c00dc2 | 182 | Sensitive *sensitive; |
6b759005 | 183 | /* kbd-interactive */ |
184 | int info_req_seen; | |
7364bd04 | 185 | /* generic */ |
186 | void *methoddata; | |
188adeb2 | 187 | }; |
188 | struct Authmethod { | |
189 | char *name; /* string to compare against server's list */ | |
190 | int (*userauth)(Authctxt *authctxt); | |
191 | int *enabled; /* flag in option struct that enables method */ | |
192 | int *batch_flag; /* flag in option struct that disables method */ | |
193 | }; | |
194 | ||
7819b5c3 | 195 | void input_userauth_success(int, u_int32_t, void *); |
196 | void input_userauth_failure(int, u_int32_t, void *); | |
197 | void input_userauth_banner(int, u_int32_t, void *); | |
198 | void input_userauth_error(int, u_int32_t, void *); | |
199 | void input_userauth_info_req(int, u_int32_t, void *); | |
200 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 201 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 202 | |
d5bb9418 | 203 | int userauth_none(Authctxt *); |
204 | int userauth_pubkey(Authctxt *); | |
205 | int userauth_passwd(Authctxt *); | |
206 | int userauth_kbdint(Authctxt *); | |
207 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 208 | int userauth_kerberos(Authctxt *); |
188adeb2 | 209 | |
7364bd04 | 210 | #ifdef GSSAPI |
211 | int userauth_gssapi(Authctxt *authctxt); | |
212 | void input_gssapi_response(int type, u_int32_t, void *); | |
213 | void input_gssapi_token(int type, u_int32_t, void *); | |
214 | void input_gssapi_hash(int type, u_int32_t, void *); | |
215 | void input_gssapi_error(int, u_int32_t, void *); | |
216 | void input_gssapi_errtok(int, u_int32_t, void *); | |
217 | #endif | |
218 | ||
d5bb9418 | 219 | void userauth(Authctxt *, char *); |
fee56204 | 220 | |
43348518 | 221 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 222 | static void pubkey_prepare(Authctxt *); |
223 | static void pubkey_cleanup(Authctxt *); | |
224 | static Key *load_identity_file(char *); | |
fee56204 | 225 | |
396c147e | 226 | static Authmethod *authmethod_get(char *authlist); |
227 | static Authmethod *authmethod_lookup(const char *name); | |
228 | static char *authmethods_get(void); | |
188adeb2 | 229 | |
230 | Authmethod authmethods[] = { | |
7364bd04 | 231 | #ifdef GSSAPI |
0789992b | 232 | {"gssapi-with-mic", |
7364bd04 | 233 | userauth_gssapi, |
234 | &options.gss_authentication, | |
235 | NULL}, | |
236 | #endif | |
3398dda9 | 237 | {"hostbased", |
238 | userauth_hostbased, | |
239 | &options.hostbased_authentication, | |
240 | NULL}, | |
9f37c0af | 241 | {"publickey", |
242 | userauth_pubkey, | |
243 | &options.pubkey_authentication, | |
244 | NULL}, | |
94ec8c6b | 245 | {"keyboard-interactive", |
246 | userauth_kbdint, | |
247 | &options.kbd_interactive_authentication, | |
248 | &options.batch_mode}, | |
9f37c0af | 249 | {"password", |
250 | userauth_passwd, | |
251 | &options.password_authentication, | |
252 | &options.batch_mode}, | |
94ec8c6b | 253 | {"none", |
254 | userauth_none, | |
255 | NULL, | |
256 | NULL}, | |
188adeb2 | 257 | {NULL, NULL, NULL, NULL} |
258 | }; | |
259 | ||
260 | void | |
8002af61 | 261 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 262 | Sensitive *sensitive) |
188adeb2 | 263 | { |
264 | Authctxt authctxt; | |
265 | int type; | |
188adeb2 | 266 | |
5ba55ada | 267 | if (options.challenge_response_authentication) |
d464095c | 268 | options.kbd_interactive_authentication = 1; |
269 | ||
188adeb2 | 270 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
271 | packet_put_cstring("ssh-userauth"); | |
272 | packet_send(); | |
a77673cc | 273 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 274 | packet_write_wait(); |
54a5250f | 275 | type = packet_read(); |
a77673cc | 276 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
277 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 278 | if (packet_remaining() > 0) { |
54a5250f | 279 | char *reply = packet_get_string(NULL); |
a77673cc | 280 | debug2("service_accept: %s", reply); |
188adeb2 | 281 | xfree(reply); |
188adeb2 | 282 | } else { |
6226a8f8 | 283 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 284 | } |
95500969 | 285 | packet_check_eom(); |
a77673cc | 286 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 287 | |
cab80f75 | 288 | if (options.preferred_authentications == NULL) |
289 | options.preferred_authentications = authmethods_get(); | |
290 | ||
188adeb2 | 291 | /* setup authentication context */ |
6b759005 | 292 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 293 | pubkey_prepare(&authctxt); |
188adeb2 | 294 | authctxt.server_user = server_user; |
8002af61 | 295 | authctxt.local_user = local_user; |
188adeb2 | 296 | authctxt.host = host; |
297 | authctxt.service = "ssh-connection"; /* service name */ | |
298 | authctxt.success = 0; | |
94ec8c6b | 299 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 300 | authctxt.authlist = NULL; |
7364bd04 | 301 | authctxt.methoddata = NULL; |
39c00dc2 | 302 | authctxt.sensitive = sensitive; |
6b759005 | 303 | authctxt.info_req_seen = 0; |
94ec8c6b | 304 | if (authctxt.method == NULL) |
305 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 306 | |
307 | /* initial userauth request */ | |
94ec8c6b | 308 | userauth_none(&authctxt); |
188adeb2 | 309 | |
7a37c112 | 310 | dispatch_init(&input_userauth_error); |
188adeb2 | 311 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
312 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 313 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 314 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
315 | ||
43348518 | 316 | pubkey_cleanup(&authctxt); |
b8c2031b | 317 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
318 | ||
6226a8f8 | 319 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 320 | } |
b8c2031b | 321 | |
188adeb2 | 322 | void |
fee56204 | 323 | userauth(Authctxt *authctxt, char *authlist) |
324 | { | |
7364bd04 | 325 | if (authctxt->methoddata) { |
326 | xfree(authctxt->methoddata); | |
327 | authctxt->methoddata = NULL; | |
328 | } | |
fee56204 | 329 | if (authlist == NULL) { |
330 | authlist = authctxt->authlist; | |
331 | } else { | |
332 | if (authctxt->authlist) | |
333 | xfree(authctxt->authlist); | |
334 | authctxt->authlist = authlist; | |
335 | } | |
336 | for (;;) { | |
337 | Authmethod *method = authmethod_get(authlist); | |
338 | if (method == NULL) | |
339 | fatal("Permission denied (%s).", authlist); | |
340 | authctxt->method = method; | |
b8c2031b | 341 | |
342 | /* reset the per method handler */ | |
343 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
344 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
345 | ||
346 | /* and try new method */ | |
fee56204 | 347 | if (method->userauth(authctxt) != 0) { |
348 | debug2("we sent a %s packet, wait for reply", method->name); | |
349 | break; | |
350 | } else { | |
351 | debug2("we did not send a packet, disable method"); | |
352 | method->enabled = NULL; | |
353 | } | |
354 | } | |
355 | } | |
d6133f43 | 356 | |
fee56204 | 357 | void |
7819b5c3 | 358 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 359 | { |
9616313f | 360 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 361 | "type %d", type); |
9616313f | 362 | } |
d6133f43 | 363 | |
9616313f | 364 | void |
7819b5c3 | 365 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 366 | { |
367 | char *msg, *lang; | |
c8f0cf13 | 368 | |
9616313f | 369 | debug3("input_userauth_banner"); |
370 | msg = packet_get_string(NULL); | |
371 | lang = packet_get_string(NULL); | |
19e633e7 | 372 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
373 | fprintf(stderr, "%s", msg); | |
9616313f | 374 | xfree(msg); |
375 | xfree(lang); | |
188adeb2 | 376 | } |
d6133f43 | 377 | |
188adeb2 | 378 | void |
7819b5c3 | 379 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 380 | { |
381 | Authctxt *authctxt = ctxt; | |
382 | if (authctxt == NULL) | |
383 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 384 | if (authctxt->authlist) { |
fee56204 | 385 | xfree(authctxt->authlist); |
c8f0cf13 | 386 | authctxt->authlist = NULL; |
387 | } | |
388 | if (authctxt->methoddata) { | |
7364bd04 | 389 | xfree(authctxt->methoddata); |
c8f0cf13 | 390 | authctxt->methoddata = NULL; |
391 | } | |
188adeb2 | 392 | authctxt->success = 1; /* break out */ |
393 | } | |
d6133f43 | 394 | |
188adeb2 | 395 | void |
7819b5c3 | 396 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 397 | { |
188adeb2 | 398 | Authctxt *authctxt = ctxt; |
399 | char *authlist = NULL; | |
400 | int partial; | |
188adeb2 | 401 | |
402 | if (authctxt == NULL) | |
403 | fatal("input_userauth_failure: no authentication context"); | |
404 | ||
94ec8c6b | 405 | authlist = packet_get_string(NULL); |
188adeb2 | 406 | partial = packet_get_char(); |
95500969 | 407 | packet_check_eom(); |
188adeb2 | 408 | |
409 | if (partial != 0) | |
bbe88b6d | 410 | logit("Authenticated with partial success."); |
6226a8f8 | 411 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 412 | |
fee56204 | 413 | userauth(authctxt, authlist); |
414 | } | |
415 | void | |
7819b5c3 | 416 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 417 | { |
418 | Authctxt *authctxt = ctxt; | |
419 | Key *key = NULL; | |
43348518 | 420 | Identity *id = NULL; |
fee56204 | 421 | Buffer b; |
c66f9d0e | 422 | int pktype, sent = 0; |
423 | u_int alen, blen; | |
424 | char *pkalg, *fp; | |
425 | u_char *pkblob; | |
fee56204 | 426 | |
427 | if (authctxt == NULL) | |
428 | fatal("input_userauth_pk_ok: no authentication context"); | |
429 | if (datafellows & SSH_BUG_PKOK) { | |
430 | /* this is similar to SSH_BUG_PKAUTH */ | |
431 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
432 | pkblob = packet_get_string(&blen); | |
433 | buffer_init(&b); | |
434 | buffer_append(&b, pkblob, blen); | |
435 | pkalg = buffer_get_string(&b, &alen); | |
436 | buffer_free(&b); | |
437 | } else { | |
438 | pkalg = packet_get_string(&alen); | |
439 | pkblob = packet_get_string(&blen); | |
440 | } | |
95500969 | 441 | packet_check_eom(); |
fee56204 | 442 | |
43348518 | 443 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 444 | |
43348518 | 445 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
446 | debug("unknown pkalg %s", pkalg); | |
447 | goto done; | |
448 | } | |
449 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
450 | debug("no key from blob. pkalg %s", pkalg); | |
451 | goto done; | |
452 | } | |
453 | if (key->type != pktype) { | |
454 | error("input_userauth_pk_ok: type mismatch " | |
455 | "for decoded key (received %d, expected %d)", | |
456 | key->type, pktype); | |
457 | goto done; | |
458 | } | |
459 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
460 | debug2("input_userauth_pk_ok: fp %s", fp); | |
461 | xfree(fp); | |
462 | ||
b56e99e2 | 463 | /* |
464 | * search keys in the reverse order, because last candidate has been | |
465 | * moved to the end of the queue. this also avoids confusion by | |
466 | * duplicate keys | |
467 | */ | |
484b2208 | 468 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 469 | if (key_equal(key, id->key)) { |
470 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 471 | break; |
472 | } | |
43348518 | 473 | } |
474 | done: | |
fee56204 | 475 | if (key != NULL) |
476 | key_free(key); | |
477 | xfree(pkalg); | |
478 | xfree(pkblob); | |
479 | ||
343288b8 | 480 | /* try another method if we did not send a packet */ |
fee56204 | 481 | if (sent == 0) |
482 | userauth(authctxt, NULL); | |
188adeb2 | 483 | } |
484 | ||
7364bd04 | 485 | #ifdef GSSAPI |
aff51935 | 486 | int |
7364bd04 | 487 | userauth_gssapi(Authctxt *authctxt) |
488 | { | |
489 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 490 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 491 | static u_int mech = 0; |
7364bd04 | 492 | OM_uint32 min; |
493 | int ok = 0; | |
494 | ||
495 | /* Try one GSSAPI method at a time, rather than sending them all at | |
496 | * once. */ | |
497 | ||
b0b30ca6 | 498 | if (gss_supported == NULL) |
499 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 500 | |
501 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 502 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 503 | if (gssctxt) |
504 | ssh_gssapi_delete_ctx(&gssctxt); | |
505 | ssh_gssapi_build_ctx(&gssctxt); | |
b0b30ca6 | 506 | ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]); |
7364bd04 | 507 | |
508 | /* My DER encoding requires length<128 */ | |
b0b30ca6 | 509 | if (gss_supported->elements[mech].length < 128 && |
7364bd04 | 510 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
511 | authctxt->host))) { | |
512 | ok = 1; /* Mechanism works */ | |
513 | } else { | |
514 | mech++; | |
515 | } | |
516 | } | |
517 | ||
18fc231c | 518 | if (!ok) { |
519 | ssh_gssapi_delete_ctx(&gssctxt); | |
2ceb8101 | 520 | return 0; |
18fc231c | 521 | } |
7364bd04 | 522 | |
523 | authctxt->methoddata=(void *)gssctxt; | |
524 | ||
525 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
526 | packet_put_cstring(authctxt->server_user); | |
527 | packet_put_cstring(authctxt->service); | |
528 | packet_put_cstring(authctxt->method->name); | |
529 | ||
530 | packet_put_int(1); | |
531 | ||
d8d9afd0 | 532 | packet_put_int((gss_supported->elements[mech].length) + 2); |
533 | packet_put_char(SSH_GSS_OIDTYPE); | |
534 | packet_put_char(gss_supported->elements[mech].length); | |
535 | packet_put_raw(gss_supported->elements[mech].elements, | |
536 | gss_supported->elements[mech].length); | |
7364bd04 | 537 | |
538 | packet_send(); | |
539 | ||
540 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
541 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
542 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
543 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
544 | ||
545 | mech++; /* Move along to next candidate */ | |
546 | ||
547 | return 1; | |
548 | } | |
549 | ||
b930668c | 550 | static OM_uint32 |
551 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
552 | { | |
553 | Authctxt *authctxt = ctxt; | |
554 | Gssctxt *gssctxt = authctxt->methoddata; | |
555 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 556 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
557 | gss_buffer_desc gssbuf; | |
0789992b | 558 | OM_uint32 status, ms, flags; |
559 | Buffer b; | |
b6453d99 | 560 | |
b930668c | 561 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 562 | recv_tok, &send_tok, &flags); |
b930668c | 563 | |
564 | if (send_tok.length > 0) { | |
565 | if (GSS_ERROR(status)) | |
566 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
567 | else | |
568 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 569 | |
b930668c | 570 | packet_put_string(send_tok.value, send_tok.length); |
571 | packet_send(); | |
572 | gss_release_buffer(&ms, &send_tok); | |
573 | } | |
b6453d99 | 574 | |
b930668c | 575 | if (status == GSS_S_COMPLETE) { |
0789992b | 576 | /* send either complete or MIC, depending on mechanism */ |
577 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
578 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
579 | packet_send(); | |
580 | } else { | |
581 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
582 | authctxt->service, "gssapi-with-mic"); | |
583 | ||
584 | gssbuf.value = buffer_ptr(&b); | |
585 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 586 | |
0789992b | 587 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 588 | |
0789992b | 589 | if (!GSS_ERROR(status)) { |
590 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
591 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 592 | |
0789992b | 593 | packet_send(); |
594 | } | |
b6453d99 | 595 | |
0789992b | 596 | buffer_free(&b); |
597 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 598 | } |
b930668c | 599 | } |
b6453d99 | 600 | |
b930668c | 601 | return status; |
602 | } | |
603 | ||
7364bd04 | 604 | void |
605 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
606 | { | |
607 | Authctxt *authctxt = ctxt; | |
608 | Gssctxt *gssctxt; | |
7364bd04 | 609 | int oidlen; |
610 | char *oidv; | |
7364bd04 | 611 | |
612 | if (authctxt == NULL) | |
613 | fatal("input_gssapi_response: no authentication context"); | |
614 | gssctxt = authctxt->methoddata; | |
615 | ||
616 | /* Setup our OID */ | |
617 | oidv = packet_get_string(&oidlen); | |
618 | ||
d8d9afd0 | 619 | if (oidlen <= 2 || |
620 | oidv[0] != SSH_GSS_OIDTYPE || | |
621 | oidv[1] != oidlen - 2) { | |
b930668c | 622 | xfree(oidv); |
d8d9afd0 | 623 | debug("Badly encoded mechanism OID received"); |
624 | userauth(authctxt, NULL); | |
d8d9afd0 | 625 | return; |
7364bd04 | 626 | } |
627 | ||
d8d9afd0 | 628 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
629 | fatal("Server returned different OID than expected"); | |
630 | ||
7364bd04 | 631 | packet_check_eom(); |
632 | ||
633 | xfree(oidv); | |
634 | ||
b930668c | 635 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 636 | /* Start again with next method on list */ |
637 | debug("Trying to start again"); | |
638 | userauth(authctxt, NULL); | |
639 | return; | |
640 | } | |
7364bd04 | 641 | } |
642 | ||
643 | void | |
644 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
645 | { | |
646 | Authctxt *authctxt = ctxt; | |
7364bd04 | 647 | gss_buffer_desc recv_tok; |
b930668c | 648 | OM_uint32 status; |
7364bd04 | 649 | u_int slen; |
650 | ||
651 | if (authctxt == NULL) | |
652 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 653 | |
654 | recv_tok.value = packet_get_string(&slen); | |
655 | recv_tok.length = slen; /* safe typecast */ | |
656 | ||
657 | packet_check_eom(); | |
658 | ||
b930668c | 659 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 660 | |
661 | xfree(recv_tok.value); | |
662 | ||
663 | if (GSS_ERROR(status)) { | |
7364bd04 | 664 | /* Start again with the next method in the list */ |
665 | userauth(authctxt, NULL); | |
666 | return; | |
667 | } | |
7364bd04 | 668 | } |
669 | ||
670 | void | |
671 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
672 | { | |
673 | Authctxt *authctxt = ctxt; | |
674 | Gssctxt *gssctxt; | |
675 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
676 | gss_buffer_desc recv_tok; | |
677 | OM_uint32 status, ms; | |
f99e1ca4 | 678 | u_int len; |
7364bd04 | 679 | |
680 | if (authctxt == NULL) | |
681 | fatal("input_gssapi_response: no authentication context"); | |
682 | gssctxt = authctxt->methoddata; | |
683 | ||
f99e1ca4 | 684 | recv_tok.value = packet_get_string(&len); |
685 | recv_tok.length = len; | |
7364bd04 | 686 | |
687 | packet_check_eom(); | |
688 | ||
689 | /* Stick it into GSSAPI and see what it says */ | |
690 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 691 | &recv_tok, &send_tok, NULL); |
7364bd04 | 692 | |
693 | xfree(recv_tok.value); | |
694 | gss_release_buffer(&ms, &send_tok); | |
695 | ||
696 | /* Server will be returning a failed packet after this one */ | |
697 | } | |
698 | ||
699 | void | |
700 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
701 | { | |
702 | OM_uint32 maj, min; | |
703 | char *msg; | |
704 | char *lang; | |
705 | ||
706 | maj=packet_get_int(); | |
707 | min=packet_get_int(); | |
708 | msg=packet_get_string(NULL); | |
709 | lang=packet_get_string(NULL); | |
710 | ||
711 | packet_check_eom(); | |
712 | ||
17318dd6 | 713 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 714 | xfree(msg); |
715 | xfree(lang); | |
716 | } | |
717 | #endif /* GSSAPI */ | |
718 | ||
94ec8c6b | 719 | int |
720 | userauth_none(Authctxt *authctxt) | |
721 | { | |
722 | /* initial userauth request */ | |
723 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
724 | packet_put_cstring(authctxt->server_user); | |
725 | packet_put_cstring(authctxt->service); | |
726 | packet_put_cstring(authctxt->method->name); | |
727 | packet_send(); | |
94ec8c6b | 728 | return 1; |
729 | } | |
730 | ||
a306f2dd | 731 | int |
188adeb2 | 732 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 733 | { |
1d1ffb87 | 734 | static int attempt = 0; |
67ec167d | 735 | char prompt[150]; |
a306f2dd | 736 | char *password; |
737 | ||
fa649821 | 738 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 739 | return 0; |
740 | ||
6aacefa7 | 741 | if (attempt != 1) |
fa649821 | 742 | error("Permission denied, please try again."); |
743 | ||
f72e01a5 | 744 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 745 | authctxt->server_user, authctxt->host); |
a306f2dd | 746 | password = read_passphrase(prompt, 0); |
747 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 748 | packet_put_cstring(authctxt->server_user); |
749 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 750 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 751 | packet_put_char(0); |
a6215e53 | 752 | packet_put_cstring(password); |
a306f2dd | 753 | memset(password, 0, strlen(password)); |
754 | xfree(password); | |
b4b701be | 755 | packet_add_padding(64); |
a306f2dd | 756 | packet_send(); |
67ec167d | 757 | |
7203d6bb | 758 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 759 | &input_userauth_passwd_changereq); |
760 | ||
a306f2dd | 761 | return 1; |
762 | } | |
67ec167d | 763 | /* |
764 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
765 | */ | |
766 | void | |
ef077e37 | 767 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 768 | { |
769 | Authctxt *authctxt = ctxt; | |
770 | char *info, *lang, *password = NULL, *retype = NULL; | |
771 | char prompt[150]; | |
772 | ||
773 | debug2("input_userauth_passwd_changereq"); | |
774 | ||
775 | if (authctxt == NULL) | |
776 | fatal("input_userauth_passwd_changereq: " | |
777 | "no authentication context"); | |
778 | ||
779 | info = packet_get_string(NULL); | |
780 | lang = packet_get_string(NULL); | |
781 | if (strlen(info) > 0) | |
bbe88b6d | 782 | logit("%s", info); |
67ec167d | 783 | xfree(info); |
784 | xfree(lang); | |
785 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
786 | packet_put_cstring(authctxt->server_user); | |
787 | packet_put_cstring(authctxt->service); | |
788 | packet_put_cstring(authctxt->method->name); | |
789 | packet_put_char(1); /* additional info */ | |
7203d6bb | 790 | snprintf(prompt, sizeof(prompt), |
67ec167d | 791 | "Enter %.30s@%.128s's old password: ", |
792 | authctxt->server_user, authctxt->host); | |
793 | password = read_passphrase(prompt, 0); | |
794 | packet_put_cstring(password); | |
795 | memset(password, 0, strlen(password)); | |
796 | xfree(password); | |
797 | password = NULL; | |
798 | while (password == NULL) { | |
7203d6bb | 799 | snprintf(prompt, sizeof(prompt), |
67ec167d | 800 | "Enter %.30s@%.128s's new password: ", |
801 | authctxt->server_user, authctxt->host); | |
802 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
803 | if (password == NULL) { | |
804 | /* bail out */ | |
805 | return; | |
806 | } | |
7203d6bb | 807 | snprintf(prompt, sizeof(prompt), |
67ec167d | 808 | "Retype %.30s@%.128s's new password: ", |
809 | authctxt->server_user, authctxt->host); | |
810 | retype = read_passphrase(prompt, 0); | |
811 | if (strcmp(password, retype) != 0) { | |
812 | memset(password, 0, strlen(password)); | |
813 | xfree(password); | |
bbe88b6d | 814 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 815 | password = NULL; |
816 | } | |
817 | memset(retype, 0, strlen(retype)); | |
818 | xfree(retype); | |
819 | } | |
820 | packet_put_cstring(password); | |
821 | memset(password, 0, strlen(password)); | |
822 | xfree(password); | |
823 | packet_add_padding(64); | |
824 | packet_send(); | |
7203d6bb | 825 | |
826 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 827 | &input_userauth_passwd_changereq); |
828 | } | |
a306f2dd | 829 | |
43348518 | 830 | static int |
831 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
832 | u_char *data, u_int datalen) | |
833 | { | |
834 | Key *prv; | |
835 | int ret; | |
836 | ||
837 | /* the agent supports this key */ | |
838 | if (id->ac) | |
839 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
840 | data, datalen)); | |
841 | /* | |
842 | * we have already loaded the private key or | |
843 | * the private key is stored in external hardware | |
844 | */ | |
845 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
846 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
847 | /* load the private key from the file */ | |
848 | if ((prv = load_identity_file(id->filename)) == NULL) | |
849 | return (-1); | |
850 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
851 | key_free(prv); | |
852 | return (ret); | |
fee56204 | 853 | } |
854 | ||
396c147e | 855 | static int |
43348518 | 856 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 857 | { |
858 | Buffer b; | |
1e3b8b07 | 859 | u_char *blob, *signature; |
c66f9d0e | 860 | u_int bloblen, slen; |
a27002e5 | 861 | u_int skip = 0; |
2e73a022 | 862 | int ret = -1; |
94ec8c6b | 863 | int have_sig = 1; |
a306f2dd | 864 | |
cbc5abf9 | 865 | debug3("sign_and_send_pubkey"); |
fee56204 | 866 | |
43348518 | 867 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 868 | /* we cannot handle this key */ |
cbc5abf9 | 869 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 870 | return 0; |
871 | } | |
a306f2dd | 872 | /* data to be signed */ |
873 | buffer_init(&b); | |
33de75a3 | 874 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 875 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 876 | skip = session_id2_len; |
33de75a3 | 877 | } else { |
878 | buffer_put_string(&b, session_id2, session_id2_len); | |
879 | skip = buffer_len(&b); | |
74fc9186 | 880 | } |
a306f2dd | 881 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 882 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 883 | buffer_put_cstring(&b, |
cbc5abf9 | 884 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 885 | "ssh-userauth" : |
188adeb2 | 886 | authctxt->service); |
cbc5abf9 | 887 | if (datafellows & SSH_BUG_PKAUTH) { |
888 | buffer_put_char(&b, have_sig); | |
889 | } else { | |
890 | buffer_put_cstring(&b, authctxt->method->name); | |
891 | buffer_put_char(&b, have_sig); | |
43348518 | 892 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 893 | } |
a306f2dd | 894 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 895 | |
896 | /* generate signature */ | |
43348518 | 897 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 898 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 899 | if (ret == -1) { |
900 | xfree(blob); | |
901 | buffer_free(&b); | |
902 | return 0; | |
903 | } | |
fa08c86b | 904 | #ifdef DEBUG_PK |
a306f2dd | 905 | buffer_dump(&b); |
906 | #endif | |
cbc5abf9 | 907 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 908 | buffer_clear(&b); |
909 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 910 | skip = session_id2_len; |
d0c832f3 | 911 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 912 | buffer_put_cstring(&b, authctxt->server_user); |
913 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 914 | buffer_put_cstring(&b, authctxt->method->name); |
915 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 916 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 917 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 918 | buffer_put_string(&b, blob, bloblen); |
919 | } | |
920 | xfree(blob); | |
fee56204 | 921 | |
a306f2dd | 922 | /* append signature */ |
923 | buffer_put_string(&b, signature, slen); | |
924 | xfree(signature); | |
925 | ||
926 | /* skip session id and packet type */ | |
74fc9186 | 927 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 928 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 929 | buffer_consume(&b, skip + 1); |
a306f2dd | 930 | |
931 | /* put remaining data from buffer into packet */ | |
932 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
933 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
934 | buffer_free(&b); | |
a306f2dd | 935 | packet_send(); |
2e73a022 | 936 | |
937 | return 1; | |
4c8722d9 | 938 | } |
939 | ||
396c147e | 940 | static int |
43348518 | 941 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 942 | { |
fee56204 | 943 | u_char *blob; |
21b30f38 | 944 | u_int bloblen, have_sig = 0; |
4c8722d9 | 945 | |
fee56204 | 946 | debug3("send_pubkey_test"); |
947 | ||
43348518 | 948 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 949 | /* we cannot handle this key */ |
950 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 951 | return 0; |
952 | } | |
fee56204 | 953 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 954 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 955 | |
fee56204 | 956 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
957 | packet_put_cstring(authctxt->server_user); | |
958 | packet_put_cstring(authctxt->service); | |
959 | packet_put_cstring(authctxt->method->name); | |
960 | packet_put_char(have_sig); | |
961 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 962 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 963 | packet_put_string(blob, bloblen); |
964 | xfree(blob); | |
965 | packet_send(); | |
966 | return 1; | |
967 | } | |
968 | ||
396c147e | 969 | static Key * |
fee56204 | 970 | load_identity_file(char *filename) |
971 | { | |
972 | Key *private; | |
973 | char prompt[300], *passphrase; | |
fc231518 | 974 | int perm_ok, quit, i; |
d156519a | 975 | struct stat st; |
fee56204 | 976 | |
d156519a | 977 | if (stat(filename, &st) < 0) { |
978 | debug3("no such identity: %s", filename); | |
979 | return NULL; | |
980 | } | |
fc231518 | 981 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
982 | if (!perm_ok) | |
983 | return NULL; | |
aeaa3d9e | 984 | if (private == NULL) { |
985 | if (options.batch_mode) | |
fee56204 | 986 | return NULL; |
4c8722d9 | 987 | snprintf(prompt, sizeof prompt, |
184eed6a | 988 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 989 | for (i = 0; i < options.number_of_password_prompts; i++) { |
990 | passphrase = read_passphrase(prompt, 0); | |
991 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 992 | private = key_load_private_type(KEY_UNSPEC, |
993 | filename, passphrase, NULL, NULL); | |
fee56204 | 994 | quit = 0; |
188adeb2 | 995 | } else { |
996 | debug2("no passphrase given, try next key"); | |
fee56204 | 997 | quit = 1; |
188adeb2 | 998 | } |
999 | memset(passphrase, 0, strlen(passphrase)); | |
1000 | xfree(passphrase); | |
aeaa3d9e | 1001 | if (private != NULL || quit) |
188adeb2 | 1002 | break; |
1003 | debug2("bad passphrase given, try again..."); | |
1004 | } | |
4c8722d9 | 1005 | } |
fee56204 | 1006 | return private; |
1007 | } | |
1008 | ||
43348518 | 1009 | /* |
1010 | * try keys in the following order: | |
1011 | * 1. agent keys that are found in the config file | |
1012 | * 2. other agent keys | |
1013 | * 3. keys that are only listed in the config file | |
1014 | */ | |
1015 | static void | |
1016 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1017 | { |
43348518 | 1018 | Identity *id; |
1019 | Idlist agent, files, *preferred; | |
1020 | Key *key; | |
1021 | AuthenticationConnection *ac; | |
1022 | char *comment; | |
1023 | int i, found; | |
1024 | ||
1025 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1026 | TAILQ_INIT(&files); /* keys from the config file */ | |
1027 | preferred = &authctxt->keys; | |
1028 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1029 | ||
1030 | /* list of keys stored in the filesystem */ | |
1031 | for (i = 0; i < options.num_identity_files; i++) { | |
1032 | key = options.identity_keys[i]; | |
1033 | if (key && key->type == KEY_RSA1) | |
1034 | continue; | |
1035 | options.identity_keys[i] = NULL; | |
52e3daed | 1036 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1037 | id->key = key; |
1038 | id->filename = xstrdup(options.identity_files[i]); | |
1039 | TAILQ_INSERT_TAIL(&files, id, next); | |
1040 | } | |
1041 | /* list of keys supported by the agent */ | |
1042 | if ((ac = ssh_get_authentication_connection())) { | |
1043 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1044 | key != NULL; | |
1045 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1046 | found = 0; | |
1047 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1048 | /* agent keys from the config file are preferred */ |
43348518 | 1049 | if (key_equal(key, id->key)) { |
1050 | key_free(key); | |
1051 | xfree(comment); | |
1052 | TAILQ_REMOVE(&files, id, next); | |
1053 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1054 | id->ac = ac; | |
1055 | found = 1; | |
1056 | break; | |
1057 | } | |
1058 | } | |
3a065ed0 | 1059 | if (!found && !options.identities_only) { |
52e3daed | 1060 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1061 | id->key = key; |
1062 | id->filename = comment; | |
1063 | id->ac = ac; | |
1064 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1065 | } | |
1066 | } | |
1067 | /* append remaining agent keys */ | |
1068 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1069 | TAILQ_REMOVE(&agent, id, next); | |
1070 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1071 | } | |
1072 | authctxt->agent = ac; | |
1073 | } | |
1074 | /* append remaining keys from the config file */ | |
1075 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1076 | TAILQ_REMOVE(&files, id, next); | |
1077 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1078 | } | |
1079 | TAILQ_FOREACH(id, preferred, next) { | |
1080 | debug2("key: %s (%p)", id->filename, id->key); | |
1081 | } | |
fee56204 | 1082 | } |
1083 | ||
43348518 | 1084 | static void |
1085 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1086 | { |
43348518 | 1087 | Identity *id; |
1088 | ||
1089 | if (authctxt->agent != NULL) | |
1090 | ssh_close_authentication_connection(authctxt->agent); | |
1091 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1092 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1093 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1094 | if (id->key) | |
1095 | key_free(id->key); | |
1096 | if (id->filename) | |
1097 | xfree(id->filename); | |
1098 | xfree(id); | |
2e73a022 | 1099 | } |
a306f2dd | 1100 | } |
1101 | ||
188adeb2 | 1102 | int |
1103 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1104 | { |
43348518 | 1105 | Identity *id; |
188adeb2 | 1106 | int sent = 0; |
1107 | ||
43348518 | 1108 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1109 | if (id->tried++) | |
1110 | return (0); | |
b56e99e2 | 1111 | /* move key to the end of the queue */ |
43348518 | 1112 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1113 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1114 | /* | |
1115 | * send a test message if we have the public key. for | |
1116 | * encrypted keys we cannot do this and have to load the | |
1117 | * private key instead | |
1118 | */ | |
1119 | if (id->key && id->key->type != KEY_RSA1) { | |
1120 | debug("Offering public key: %s", id->filename); | |
1121 | sent = send_pubkey_test(authctxt, id); | |
1122 | } else if (id->key == NULL) { | |
1123 | debug("Trying private key: %s", id->filename); | |
1124 | id->key = load_identity_file(id->filename); | |
1125 | if (id->key != NULL) { | |
1126 | id->isprivate = 1; | |
1127 | sent = sign_and_send_pubkey(authctxt, id); | |
1128 | key_free(id->key); | |
1129 | id->key = NULL; | |
fee56204 | 1130 | } |
fee56204 | 1131 | } |
43348518 | 1132 | if (sent) |
1133 | return (sent); | |
fa08c86b | 1134 | } |
43348518 | 1135 | return (0); |
188adeb2 | 1136 | } |
a306f2dd | 1137 | |
94ec8c6b | 1138 | /* |
1139 | * Send userauth request message specifying keyboard-interactive method. | |
1140 | */ | |
1141 | int | |
1142 | userauth_kbdint(Authctxt *authctxt) | |
1143 | { | |
1144 | static int attempt = 0; | |
1145 | ||
1146 | if (attempt++ >= options.number_of_password_prompts) | |
1147 | return 0; | |
6b759005 | 1148 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1149 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1150 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1151 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1152 | return 0; | |
1153 | } | |
94ec8c6b | 1154 | |
1155 | debug2("userauth_kbdint"); | |
1156 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1157 | packet_put_cstring(authctxt->server_user); | |
1158 | packet_put_cstring(authctxt->service); | |
1159 | packet_put_cstring(authctxt->method->name); | |
1160 | packet_put_cstring(""); /* lang */ | |
1161 | packet_put_cstring(options.kbd_interactive_devices ? | |
1162 | options.kbd_interactive_devices : ""); | |
1163 | packet_send(); | |
94ec8c6b | 1164 | |
1165 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1166 | return 1; | |
1167 | } | |
1168 | ||
1169 | /* | |
f72e01a5 | 1170 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1171 | */ |
1172 | void | |
7819b5c3 | 1173 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1174 | { |
1175 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1176 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1177 | u_int num_prompts, i; |
94ec8c6b | 1178 | int echo = 0; |
1179 | ||
1180 | debug2("input_userauth_info_req"); | |
1181 | ||
1182 | if (authctxt == NULL) | |
1183 | fatal("input_userauth_info_req: no authentication context"); | |
1184 | ||
6b759005 | 1185 | authctxt->info_req_seen = 1; |
1186 | ||
94ec8c6b | 1187 | name = packet_get_string(NULL); |
1188 | inst = packet_get_string(NULL); | |
1189 | lang = packet_get_string(NULL); | |
94ec8c6b | 1190 | if (strlen(name) > 0) |
bbe88b6d | 1191 | logit("%s", name); |
94ec8c6b | 1192 | if (strlen(inst) > 0) |
bbe88b6d | 1193 | logit("%s", inst); |
f72e01a5 | 1194 | xfree(name); |
94ec8c6b | 1195 | xfree(inst); |
f72e01a5 | 1196 | xfree(lang); |
94ec8c6b | 1197 | |
1198 | num_prompts = packet_get_int(); | |
1199 | /* | |
1200 | * Begin to build info response packet based on prompts requested. | |
1201 | * We commit to providing the correct number of responses, so if | |
1202 | * further on we run into a problem that prevents this, we have to | |
1203 | * be sure and clean this up and send a correct error response. | |
1204 | */ | |
1205 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1206 | packet_put_int(num_prompts); | |
1207 | ||
5ba55ada | 1208 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1209 | for (i = 0; i < num_prompts; i++) { |
1210 | prompt = packet_get_string(NULL); | |
1211 | echo = packet_get_char(); | |
1212 | ||
1843a425 | 1213 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1214 | |
a6215e53 | 1215 | packet_put_cstring(response); |
94ec8c6b | 1216 | memset(response, 0, strlen(response)); |
1217 | xfree(response); | |
1218 | xfree(prompt); | |
1219 | } | |
95500969 | 1220 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1221 | |
b4b701be | 1222 | packet_add_padding(64); |
94ec8c6b | 1223 | packet_send(); |
94ec8c6b | 1224 | } |
a306f2dd | 1225 | |
39c00dc2 | 1226 | static int |
d6133f43 | 1227 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1228 | u_char *data, u_int datalen) |
1229 | { | |
1230 | Buffer b; | |
7091a26b | 1231 | struct stat st; |
39c00dc2 | 1232 | pid_t pid; |
d4826734 | 1233 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1234 | |
6226a8f8 | 1235 | debug2("ssh_keysign called"); |
39c00dc2 | 1236 | |
7091a26b | 1237 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1238 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1239 | return -1; | |
1240 | } | |
39c00dc2 | 1241 | if (fflush(stdout) != 0) |
1242 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1243 | if (pipe(to) < 0) { | |
1244 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1245 | return -1; | |
1246 | } | |
1247 | if (pipe(from) < 0) { | |
1248 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1249 | return -1; | |
1250 | } | |
1251 | if ((pid = fork()) < 0) { | |
1252 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1253 | return -1; | |
1254 | } | |
1255 | if (pid == 0) { | |
82aeee5d | 1256 | permanently_set_uid(getpwuid(getuid())); |
39c00dc2 | 1257 | close(from[0]); |
1258 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1259 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1260 | close(to[1]); | |
1261 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1262 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
d4826734 | 1263 | close(from[1]); |
1264 | close(to[0]); | |
a3f69458 | 1265 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
39c00dc2 | 1266 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
1267 | strerror(errno)); | |
1268 | } | |
1269 | close(from[1]); | |
1270 | close(to[0]); | |
1271 | ||
1272 | buffer_init(&b); | |
d4826734 | 1273 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
39c00dc2 | 1274 | buffer_put_string(&b, data, datalen); |
d3cbe6f8 | 1275 | if (ssh_msg_send(to[1], version, &b) == -1) |
1276 | fatal("ssh_keysign: couldn't send request"); | |
39c00dc2 | 1277 | |
e987fdbe | 1278 | if (ssh_msg_recv(from[0], &b) < 0) { |
7091a26b | 1279 | error("ssh_keysign: no reply"); |
43f7a4b8 | 1280 | buffer_free(&b); |
39c00dc2 | 1281 | return -1; |
1282 | } | |
39c00dc2 | 1283 | close(from[0]); |
1284 | close(to[1]); | |
1285 | ||
d4826734 | 1286 | while (waitpid(pid, &status, 0) < 0) |
1287 | if (errno != EINTR) | |
1288 | break; | |
39c00dc2 | 1289 | |
7091a26b | 1290 | if (buffer_get_char(&b) != version) { |
1291 | error("ssh_keysign: bad version"); | |
43f7a4b8 | 1292 | buffer_free(&b); |
7091a26b | 1293 | return -1; |
1294 | } | |
1295 | *sigp = buffer_get_string(&b, lenp); | |
43f7a4b8 | 1296 | buffer_free(&b); |
7091a26b | 1297 | |
39c00dc2 | 1298 | return 0; |
1299 | } | |
1300 | ||
8002af61 | 1301 | int |
1302 | userauth_hostbased(Authctxt *authctxt) | |
1303 | { | |
1304 | Key *private = NULL; | |
39c00dc2 | 1305 | Sensitive *sensitive = authctxt->sensitive; |
8002af61 | 1306 | Buffer b; |
1307 | u_char *signature, *blob; | |
1308 | char *chost, *pkalg, *p; | |
8dddf799 | 1309 | const char *service; |
8002af61 | 1310 | u_int blen, slen; |
f98c3421 | 1311 | int ok, i, len, found = 0; |
8002af61 | 1312 | |
8002af61 | 1313 | /* check for a useful key */ |
39c00dc2 | 1314 | for (i = 0; i < sensitive->nkeys; i++) { |
1315 | private = sensitive->keys[i]; | |
8002af61 | 1316 | if (private && private->type != KEY_RSA1) { |
1317 | found = 1; | |
1318 | /* we take and free the key */ | |
39c00dc2 | 1319 | sensitive->keys[i] = NULL; |
8002af61 | 1320 | break; |
1321 | } | |
1322 | } | |
1323 | if (!found) { | |
6226a8f8 | 1324 | debug("No more client hostkeys for hostbased authentication."); |
8002af61 | 1325 | return 0; |
1326 | } | |
1327 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1328 | key_free(private); | |
8002af61 | 1329 | return 0; |
1330 | } | |
e8d59b4d | 1331 | /* figure out a name for the client host */ |
1332 | p = get_local_name(packet_get_connection_in()); | |
1333 | if (p == NULL) { | |
1334 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1335 | key_free(private); | |
18fc231c | 1336 | xfree(blob); |
e8d59b4d | 1337 | return 0; |
1338 | } | |
1339 | len = strlen(p) + 2; | |
52e3daed | 1340 | xasprintf(&chost, "%s.", p); |
e8d59b4d | 1341 | debug2("userauth_hostbased: chost %s", chost); |
3e2f2431 | 1342 | xfree(p); |
e8d59b4d | 1343 | |
8dddf799 | 1344 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
1345 | authctxt->service; | |
8002af61 | 1346 | pkalg = xstrdup(key_ssh_name(private)); |
1347 | buffer_init(&b); | |
8002af61 | 1348 | /* construct data */ |
8dddf799 | 1349 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 1350 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
1351 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 1352 | buffer_put_cstring(&b, service); |
8002af61 | 1353 | buffer_put_cstring(&b, authctxt->method->name); |
1354 | buffer_put_cstring(&b, pkalg); | |
1355 | buffer_put_string(&b, blob, blen); | |
1356 | buffer_put_cstring(&b, chost); | |
1357 | buffer_put_cstring(&b, authctxt->local_user); | |
1358 | #ifdef DEBUG_PK | |
1359 | buffer_dump(&b); | |
1360 | #endif | |
39c00dc2 | 1361 | if (sensitive->external_keysign) |
1362 | ok = ssh_keysign(private, &signature, &slen, | |
1363 | buffer_ptr(&b), buffer_len(&b)); | |
1364 | else | |
1365 | ok = key_sign(private, &signature, &slen, | |
1366 | buffer_ptr(&b), buffer_len(&b)); | |
8002af61 | 1367 | key_free(private); |
1368 | buffer_free(&b); | |
1369 | if (ok != 0) { | |
1370 | error("key_sign failed"); | |
1371 | xfree(chost); | |
1372 | xfree(pkalg); | |
18fc231c | 1373 | xfree(blob); |
8002af61 | 1374 | return 0; |
1375 | } | |
1376 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1377 | packet_put_cstring(authctxt->server_user); | |
1378 | packet_put_cstring(authctxt->service); | |
1379 | packet_put_cstring(authctxt->method->name); | |
1380 | packet_put_cstring(pkalg); | |
1381 | packet_put_string(blob, blen); | |
1382 | packet_put_cstring(chost); | |
1383 | packet_put_cstring(authctxt->local_user); | |
1384 | packet_put_string(signature, slen); | |
1385 | memset(signature, 's', slen); | |
1386 | xfree(signature); | |
1387 | xfree(chost); | |
1388 | xfree(pkalg); | |
18fc231c | 1389 | xfree(blob); |
8002af61 | 1390 | |
1391 | packet_send(); | |
1392 | return 1; | |
1393 | } | |
1394 | ||
188adeb2 | 1395 | /* find auth method */ |
1396 | ||
188adeb2 | 1397 | /* |
1398 | * given auth method name, if configurable options permit this method fill | |
1399 | * in auth_ident field and return true, otherwise return false. | |
1400 | */ | |
396c147e | 1401 | static int |
188adeb2 | 1402 | authmethod_is_enabled(Authmethod *method) |
1403 | { | |
1404 | if (method == NULL) | |
1405 | return 0; | |
1406 | /* return false if options indicate this method is disabled */ | |
1407 | if (method->enabled == NULL || *method->enabled == 0) | |
1408 | return 0; | |
1409 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1410 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1411 | return 0; | |
1412 | return 1; | |
1413 | } | |
a306f2dd | 1414 | |
396c147e | 1415 | static Authmethod * |
188adeb2 | 1416 | authmethod_lookup(const char *name) |
1417 | { | |
1418 | Authmethod *method = NULL; | |
1419 | if (name != NULL) | |
1420 | for (method = authmethods; method->name != NULL; method++) | |
1421 | if (strcmp(name, method->name) == 0) | |
1422 | return method; | |
1423 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1424 | return NULL; | |
1425 | } | |
1426 | ||
cab80f75 | 1427 | /* XXX internal state */ |
1428 | static Authmethod *current = NULL; | |
1429 | static char *supported = NULL; | |
1430 | static char *preferred = NULL; | |
d6133f43 | 1431 | |
188adeb2 | 1432 | /* |
1433 | * Given the authentication method list sent by the server, return the | |
1434 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 1435 | * use a built-in default list. |
2b87da3b | 1436 | */ |
396c147e | 1437 | static Authmethod * |
188adeb2 | 1438 | authmethod_get(char *authlist) |
1439 | { | |
cab80f75 | 1440 | char *name = NULL; |
21b30f38 | 1441 | u_int next; |
2b87da3b | 1442 | |
188adeb2 | 1443 | /* Use a suitable default if we're passed a nil list. */ |
1444 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 1445 | authlist = options.preferred_authentications; |
1446 | ||
1447 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1448 | debug3("start over, passed a different list %s", authlist); | |
1449 | if (supported != NULL) | |
1450 | xfree(supported); | |
1451 | supported = xstrdup(authlist); | |
1452 | preferred = options.preferred_authentications; | |
1453 | debug3("preferred %s", preferred); | |
1454 | current = NULL; | |
1455 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1456 | return current; | |
188adeb2 | 1457 | |
cab80f75 | 1458 | for (;;) { |
1459 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
6226a8f8 | 1460 | debug("No more authentication methods to try."); |
cab80f75 | 1461 | current = NULL; |
1462 | return NULL; | |
1463 | } | |
1464 | preferred += next; | |
94ec8c6b | 1465 | debug3("authmethod_lookup %s", name); |
cab80f75 | 1466 | debug3("remaining preferred: %s", preferred); |
1467 | if ((current = authmethod_lookup(name)) != NULL && | |
1468 | authmethod_is_enabled(current)) { | |
94ec8c6b | 1469 | debug3("authmethod_is_enabled %s", name); |
6226a8f8 | 1470 | debug("Next authentication method: %s", name); |
cab80f75 | 1471 | return current; |
94ec8c6b | 1472 | } |
a306f2dd | 1473 | } |
cab80f75 | 1474 | } |
a22aff1f | 1475 | |
ffb215be | 1476 | static char * |
cab80f75 | 1477 | authmethods_get(void) |
1478 | { | |
1479 | Authmethod *method = NULL; | |
3469eac4 | 1480 | Buffer b; |
1481 | char *list; | |
cab80f75 | 1482 | |
3469eac4 | 1483 | buffer_init(&b); |
cab80f75 | 1484 | for (method = authmethods; method->name != NULL; method++) { |
1485 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1486 | if (buffer_len(&b) > 0) |
1487 | buffer_append(&b, ",", 1); | |
1488 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1489 | } |
1490 | } | |
3469eac4 | 1491 | buffer_append(&b, "\0", 1); |
1492 | list = xstrdup(buffer_ptr(&b)); | |
1493 | buffer_free(&b); | |
1494 | return list; | |
a306f2dd | 1495 | } |