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6cba36fd | 1 | /* $OpenBSD: sshconnect2.c,v 1.153 2006/05/08 10:49:48 djm 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" | |
94ec8c6b | 56 | |
7364bd04 | 57 | #ifdef GSSAPI |
58 | #include "ssh-gss.h" | |
59 | #endif | |
60 | ||
a306f2dd | 61 | /* import */ |
62 | extern char *client_version_string; | |
63 | extern char *server_version_string; | |
64 | extern Options options; | |
65 | ||
66 | /* | |
67 | * SSH2 key exchange | |
68 | */ | |
69 | ||
1e3b8b07 | 70 | u_char *session_id2 = NULL; |
a27002e5 | 71 | u_int session_id2_len = 0; |
a306f2dd | 72 | |
a5c9ffdb | 73 | char *xxx_host; |
74 | struct sockaddr *xxx_hostaddr; | |
75 | ||
e092ce67 | 76 | Kex *xxx_kex = NULL; |
77 | ||
396c147e | 78 | static int |
f49bc4f7 | 79 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 80 | { |
f49bc4f7 | 81 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 82 | fatal("Host key verification failed."); |
a5c9ffdb | 83 | return 0; |
84 | } | |
85 | ||
a306f2dd | 86 | void |
94ec8c6b | 87 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
88 | { | |
94ec8c6b | 89 | Kex *kex; |
a5c9ffdb | 90 | |
91 | xxx_host = host; | |
92 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 93 | |
c523303b | 94 | if (options.ciphers == (char *)-1) { |
bbe88b6d | 95 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
c523303b | 96 | options.ciphers = NULL; |
94ec8c6b | 97 | } |
98 | if (options.ciphers != NULL) { | |
99 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
100 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
101 | } | |
1ad64a93 | 102 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
103 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
104 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
105 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 106 | if (options.compression) { |
b2552997 | 107 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 108 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
94ec8c6b | 109 | } else { |
b2552997 | 110 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
07200973 | 111 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
94ec8c6b | 112 | } |
b2552997 | 113 | if (options.macs != NULL) { |
114 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
115 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
116 | } | |
e961a8f9 | 117 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 118 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 119 | options.hostkeyalgorithms; |
94ec8c6b | 120 | |
ffd7b36b | 121 | if (options.rekey_limit) |
122 | packet_set_rekey_limit(options.rekey_limit); | |
123 | ||
7a37c112 | 124 | /* start key exchange */ |
d8ee838b | 125 | kex = kex_setup(myproposal); |
98a58eda | 126 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 127 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 128 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 129 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
a5c9ffdb | 130 | kex->client_version_string=client_version_string; |
131 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 132 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 133 | |
e092ce67 | 134 | xxx_kex = kex; |
135 | ||
c422989b | 136 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 137 | |
d1ac6175 | 138 | session_id2 = kex->session_id; |
139 | session_id2_len = kex->session_id_len; | |
140 | ||
94ec8c6b | 141 | #ifdef DEBUG_KEXDH |
142 | /* send 1st encrypted/maced/compressed message */ | |
143 | packet_start(SSH2_MSG_IGNORE); | |
144 | packet_put_cstring("markus"); | |
145 | packet_send(); | |
146 | packet_write_wait(); | |
147 | #endif | |
a306f2dd | 148 | } |
71276795 | 149 | |
a306f2dd | 150 | /* |
151 | * Authenticate user | |
152 | */ | |
188adeb2 | 153 | |
154 | typedef struct Authctxt Authctxt; | |
155 | typedef struct Authmethod Authmethod; | |
43348518 | 156 | typedef struct identity Identity; |
157 | typedef struct idlist Idlist; | |
158 | ||
159 | struct identity { | |
160 | TAILQ_ENTRY(identity) next; | |
161 | AuthenticationConnection *ac; /* set if agent supports key */ | |
162 | Key *key; /* public/private key */ | |
163 | char *filename; /* comment for agent-only keys */ | |
164 | int tried; | |
165 | int isprivate; /* key points to the private key */ | |
166 | }; | |
167 | TAILQ_HEAD(idlist, identity); | |
188adeb2 | 168 | |
169 | struct Authctxt { | |
170 | const char *server_user; | |
8002af61 | 171 | const char *local_user; |
188adeb2 | 172 | const char *host; |
173 | const char *service; | |
188adeb2 | 174 | Authmethod *method; |
94ec8c6b | 175 | int success; |
fee56204 | 176 | char *authlist; |
8002af61 | 177 | /* pubkey */ |
43348518 | 178 | Idlist keys; |
8002af61 | 179 | AuthenticationConnection *agent; |
180 | /* hostbased */ | |
39c00dc2 | 181 | Sensitive *sensitive; |
6b759005 | 182 | /* kbd-interactive */ |
183 | int info_req_seen; | |
7364bd04 | 184 | /* generic */ |
185 | void *methoddata; | |
188adeb2 | 186 | }; |
187 | struct Authmethod { | |
188 | char *name; /* string to compare against server's list */ | |
189 | int (*userauth)(Authctxt *authctxt); | |
190 | int *enabled; /* flag in option struct that enables method */ | |
191 | int *batch_flag; /* flag in option struct that disables method */ | |
192 | }; | |
193 | ||
7819b5c3 | 194 | void input_userauth_success(int, u_int32_t, void *); |
195 | void input_userauth_failure(int, u_int32_t, void *); | |
196 | void input_userauth_banner(int, u_int32_t, void *); | |
197 | void input_userauth_error(int, u_int32_t, void *); | |
198 | void input_userauth_info_req(int, u_int32_t, void *); | |
199 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
67ec167d | 200 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
94ec8c6b | 201 | |
d5bb9418 | 202 | int userauth_none(Authctxt *); |
203 | int userauth_pubkey(Authctxt *); | |
204 | int userauth_passwd(Authctxt *); | |
205 | int userauth_kbdint(Authctxt *); | |
206 | int userauth_hostbased(Authctxt *); | |
802e01b8 | 207 | int userauth_kerberos(Authctxt *); |
188adeb2 | 208 | |
7364bd04 | 209 | #ifdef GSSAPI |
210 | int userauth_gssapi(Authctxt *authctxt); | |
211 | void input_gssapi_response(int type, u_int32_t, void *); | |
212 | void input_gssapi_token(int type, u_int32_t, void *); | |
213 | void input_gssapi_hash(int type, u_int32_t, void *); | |
214 | void input_gssapi_error(int, u_int32_t, void *); | |
215 | void input_gssapi_errtok(int, u_int32_t, void *); | |
216 | #endif | |
217 | ||
d5bb9418 | 218 | void userauth(Authctxt *, char *); |
fee56204 | 219 | |
43348518 | 220 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
43348518 | 221 | static void pubkey_prepare(Authctxt *); |
222 | static void pubkey_cleanup(Authctxt *); | |
223 | static Key *load_identity_file(char *); | |
fee56204 | 224 | |
396c147e | 225 | static Authmethod *authmethod_get(char *authlist); |
226 | static Authmethod *authmethod_lookup(const char *name); | |
227 | static char *authmethods_get(void); | |
188adeb2 | 228 | |
229 | Authmethod authmethods[] = { | |
7364bd04 | 230 | #ifdef GSSAPI |
0789992b | 231 | {"gssapi-with-mic", |
7364bd04 | 232 | userauth_gssapi, |
233 | &options.gss_authentication, | |
234 | NULL}, | |
235 | #endif | |
3398dda9 | 236 | {"hostbased", |
237 | userauth_hostbased, | |
238 | &options.hostbased_authentication, | |
239 | NULL}, | |
9f37c0af | 240 | {"publickey", |
241 | userauth_pubkey, | |
242 | &options.pubkey_authentication, | |
243 | NULL}, | |
94ec8c6b | 244 | {"keyboard-interactive", |
245 | userauth_kbdint, | |
246 | &options.kbd_interactive_authentication, | |
247 | &options.batch_mode}, | |
9f37c0af | 248 | {"password", |
249 | userauth_passwd, | |
250 | &options.password_authentication, | |
251 | &options.batch_mode}, | |
94ec8c6b | 252 | {"none", |
253 | userauth_none, | |
254 | NULL, | |
255 | NULL}, | |
188adeb2 | 256 | {NULL, NULL, NULL, NULL} |
257 | }; | |
258 | ||
259 | void | |
8002af61 | 260 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
39c00dc2 | 261 | Sensitive *sensitive) |
188adeb2 | 262 | { |
263 | Authctxt authctxt; | |
264 | int type; | |
188adeb2 | 265 | |
5ba55ada | 266 | if (options.challenge_response_authentication) |
d464095c | 267 | options.kbd_interactive_authentication = 1; |
268 | ||
188adeb2 | 269 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
270 | packet_put_cstring("ssh-userauth"); | |
271 | packet_send(); | |
a77673cc | 272 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
188adeb2 | 273 | packet_write_wait(); |
54a5250f | 274 | type = packet_read(); |
a77673cc | 275 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
276 | fatal("Server denied authentication request: %d", type); | |
188adeb2 | 277 | if (packet_remaining() > 0) { |
54a5250f | 278 | char *reply = packet_get_string(NULL); |
a77673cc | 279 | debug2("service_accept: %s", reply); |
188adeb2 | 280 | xfree(reply); |
188adeb2 | 281 | } else { |
6226a8f8 | 282 | debug2("buggy server: service_accept w/o service"); |
188adeb2 | 283 | } |
95500969 | 284 | packet_check_eom(); |
a77673cc | 285 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
188adeb2 | 286 | |
cab80f75 | 287 | if (options.preferred_authentications == NULL) |
288 | options.preferred_authentications = authmethods_get(); | |
289 | ||
188adeb2 | 290 | /* setup authentication context */ |
6b759005 | 291 | memset(&authctxt, 0, sizeof(authctxt)); |
43348518 | 292 | pubkey_prepare(&authctxt); |
188adeb2 | 293 | authctxt.server_user = server_user; |
8002af61 | 294 | authctxt.local_user = local_user; |
188adeb2 | 295 | authctxt.host = host; |
296 | authctxt.service = "ssh-connection"; /* service name */ | |
297 | authctxt.success = 0; | |
94ec8c6b | 298 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 299 | authctxt.authlist = NULL; |
7364bd04 | 300 | authctxt.methoddata = NULL; |
39c00dc2 | 301 | authctxt.sensitive = sensitive; |
6b759005 | 302 | authctxt.info_req_seen = 0; |
94ec8c6b | 303 | if (authctxt.method == NULL) |
304 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 305 | |
306 | /* initial userauth request */ | |
94ec8c6b | 307 | userauth_none(&authctxt); |
188adeb2 | 308 | |
7a37c112 | 309 | dispatch_init(&input_userauth_error); |
188adeb2 | 310 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
311 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 312 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 313 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
314 | ||
43348518 | 315 | pubkey_cleanup(&authctxt); |
b8c2031b | 316 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
317 | ||
6226a8f8 | 318 | debug("Authentication succeeded (%s).", authctxt.method->name); |
188adeb2 | 319 | } |
b8c2031b | 320 | |
188adeb2 | 321 | void |
fee56204 | 322 | userauth(Authctxt *authctxt, char *authlist) |
323 | { | |
7364bd04 | 324 | if (authctxt->methoddata) { |
325 | xfree(authctxt->methoddata); | |
326 | authctxt->methoddata = NULL; | |
327 | } | |
fee56204 | 328 | if (authlist == NULL) { |
329 | authlist = authctxt->authlist; | |
330 | } else { | |
331 | if (authctxt->authlist) | |
332 | xfree(authctxt->authlist); | |
333 | authctxt->authlist = authlist; | |
334 | } | |
335 | for (;;) { | |
336 | Authmethod *method = authmethod_get(authlist); | |
337 | if (method == NULL) | |
338 | fatal("Permission denied (%s).", authlist); | |
339 | authctxt->method = method; | |
b8c2031b | 340 | |
341 | /* reset the per method handler */ | |
342 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
343 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
344 | ||
345 | /* and try new method */ | |
fee56204 | 346 | if (method->userauth(authctxt) != 0) { |
347 | debug2("we sent a %s packet, wait for reply", method->name); | |
348 | break; | |
349 | } else { | |
350 | debug2("we did not send a packet, disable method"); | |
351 | method->enabled = NULL; | |
352 | } | |
353 | } | |
354 | } | |
d6133f43 | 355 | |
fee56204 | 356 | void |
7819b5c3 | 357 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 358 | { |
9616313f | 359 | fatal("input_userauth_error: bad message during authentication: " |
4e2e5cfd | 360 | "type %d", type); |
9616313f | 361 | } |
d6133f43 | 362 | |
9616313f | 363 | void |
7819b5c3 | 364 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 365 | { |
366 | char *msg, *lang; | |
c8f0cf13 | 367 | |
9616313f | 368 | debug3("input_userauth_banner"); |
369 | msg = packet_get_string(NULL); | |
370 | lang = packet_get_string(NULL); | |
19e633e7 | 371 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
372 | fprintf(stderr, "%s", msg); | |
9616313f | 373 | xfree(msg); |
374 | xfree(lang); | |
188adeb2 | 375 | } |
d6133f43 | 376 | |
188adeb2 | 377 | void |
7819b5c3 | 378 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 379 | { |
380 | Authctxt *authctxt = ctxt; | |
381 | if (authctxt == NULL) | |
382 | fatal("input_userauth_success: no authentication context"); | |
c8f0cf13 | 383 | if (authctxt->authlist) { |
fee56204 | 384 | xfree(authctxt->authlist); |
c8f0cf13 | 385 | authctxt->authlist = NULL; |
386 | } | |
387 | if (authctxt->methoddata) { | |
7364bd04 | 388 | xfree(authctxt->methoddata); |
c8f0cf13 | 389 | authctxt->methoddata = NULL; |
390 | } | |
188adeb2 | 391 | authctxt->success = 1; /* break out */ |
392 | } | |
d6133f43 | 393 | |
188adeb2 | 394 | void |
7819b5c3 | 395 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 396 | { |
188adeb2 | 397 | Authctxt *authctxt = ctxt; |
398 | char *authlist = NULL; | |
399 | int partial; | |
188adeb2 | 400 | |
401 | if (authctxt == NULL) | |
402 | fatal("input_userauth_failure: no authentication context"); | |
403 | ||
94ec8c6b | 404 | authlist = packet_get_string(NULL); |
188adeb2 | 405 | partial = packet_get_char(); |
95500969 | 406 | packet_check_eom(); |
188adeb2 | 407 | |
408 | if (partial != 0) | |
bbe88b6d | 409 | logit("Authenticated with partial success."); |
6226a8f8 | 410 | debug("Authentications that can continue: %s", authlist); |
188adeb2 | 411 | |
fee56204 | 412 | userauth(authctxt, authlist); |
413 | } | |
414 | void | |
7819b5c3 | 415 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 416 | { |
417 | Authctxt *authctxt = ctxt; | |
418 | Key *key = NULL; | |
43348518 | 419 | Identity *id = NULL; |
fee56204 | 420 | Buffer b; |
c66f9d0e | 421 | int pktype, sent = 0; |
422 | u_int alen, blen; | |
423 | char *pkalg, *fp; | |
424 | u_char *pkblob; | |
fee56204 | 425 | |
426 | if (authctxt == NULL) | |
427 | fatal("input_userauth_pk_ok: no authentication context"); | |
428 | if (datafellows & SSH_BUG_PKOK) { | |
429 | /* this is similar to SSH_BUG_PKAUTH */ | |
430 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
431 | pkblob = packet_get_string(&blen); | |
432 | buffer_init(&b); | |
433 | buffer_append(&b, pkblob, blen); | |
434 | pkalg = buffer_get_string(&b, &alen); | |
435 | buffer_free(&b); | |
436 | } else { | |
437 | pkalg = packet_get_string(&alen); | |
438 | pkblob = packet_get_string(&blen); | |
439 | } | |
95500969 | 440 | packet_check_eom(); |
fee56204 | 441 | |
43348518 | 442 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
fee56204 | 443 | |
43348518 | 444 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
445 | debug("unknown pkalg %s", pkalg); | |
446 | goto done; | |
447 | } | |
448 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
449 | debug("no key from blob. pkalg %s", pkalg); | |
450 | goto done; | |
451 | } | |
452 | if (key->type != pktype) { | |
453 | error("input_userauth_pk_ok: type mismatch " | |
454 | "for decoded key (received %d, expected %d)", | |
455 | key->type, pktype); | |
456 | goto done; | |
457 | } | |
458 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
459 | debug2("input_userauth_pk_ok: fp %s", fp); | |
460 | xfree(fp); | |
461 | ||
b56e99e2 | 462 | /* |
463 | * search keys in the reverse order, because last candidate has been | |
464 | * moved to the end of the queue. this also avoids confusion by | |
465 | * duplicate keys | |
466 | */ | |
484b2208 | 467 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
43348518 | 468 | if (key_equal(key, id->key)) { |
469 | sent = sign_and_send_pubkey(authctxt, id); | |
fee56204 | 470 | break; |
471 | } | |
43348518 | 472 | } |
473 | done: | |
fee56204 | 474 | if (key != NULL) |
475 | key_free(key); | |
476 | xfree(pkalg); | |
477 | xfree(pkblob); | |
478 | ||
343288b8 | 479 | /* try another method if we did not send a packet */ |
fee56204 | 480 | if (sent == 0) |
481 | userauth(authctxt, NULL); | |
188adeb2 | 482 | } |
483 | ||
7364bd04 | 484 | #ifdef GSSAPI |
aff51935 | 485 | int |
7364bd04 | 486 | userauth_gssapi(Authctxt *authctxt) |
487 | { | |
488 | Gssctxt *gssctxt = NULL; | |
b0b30ca6 | 489 | static gss_OID_set gss_supported = NULL; |
2ceb8101 | 490 | static u_int mech = 0; |
7364bd04 | 491 | OM_uint32 min; |
492 | int ok = 0; | |
493 | ||
494 | /* Try one GSSAPI method at a time, rather than sending them all at | |
495 | * once. */ | |
496 | ||
b0b30ca6 | 497 | if (gss_supported == NULL) |
498 | gss_indicate_mechs(&min, &gss_supported); | |
7364bd04 | 499 | |
500 | /* Check to see if the mechanism is usable before we offer it */ | |
b0b30ca6 | 501 | while (mech < gss_supported->count && !ok) { |
7364bd04 | 502 | if (gssctxt) |
503 | ssh_gssapi_delete_ctx(&gssctxt); | |
504 | ssh_gssapi_build_ctx(&gssctxt); | |
b0b30ca6 | 505 | ssh_gssapi_set_oid(gssctxt, &gss_supported->elements[mech]); |
7364bd04 | 506 | |
507 | /* My DER encoding requires length<128 */ | |
b0b30ca6 | 508 | if (gss_supported->elements[mech].length < 128 && |
7364bd04 | 509 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
510 | authctxt->host))) { | |
511 | ok = 1; /* Mechanism works */ | |
512 | } else { | |
513 | mech++; | |
514 | } | |
515 | } | |
516 | ||
18fc231c | 517 | if (!ok) { |
518 | ssh_gssapi_delete_ctx(&gssctxt); | |
2ceb8101 | 519 | return 0; |
18fc231c | 520 | } |
7364bd04 | 521 | |
522 | authctxt->methoddata=(void *)gssctxt; | |
523 | ||
524 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
525 | packet_put_cstring(authctxt->server_user); | |
526 | packet_put_cstring(authctxt->service); | |
527 | packet_put_cstring(authctxt->method->name); | |
528 | ||
529 | packet_put_int(1); | |
530 | ||
d8d9afd0 | 531 | packet_put_int((gss_supported->elements[mech].length) + 2); |
532 | packet_put_char(SSH_GSS_OIDTYPE); | |
533 | packet_put_char(gss_supported->elements[mech].length); | |
534 | packet_put_raw(gss_supported->elements[mech].elements, | |
535 | gss_supported->elements[mech].length); | |
7364bd04 | 536 | |
537 | packet_send(); | |
538 | ||
539 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
540 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
541 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
542 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
543 | ||
544 | mech++; /* Move along to next candidate */ | |
545 | ||
546 | return 1; | |
547 | } | |
548 | ||
b930668c | 549 | static OM_uint32 |
550 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
551 | { | |
552 | Authctxt *authctxt = ctxt; | |
553 | Gssctxt *gssctxt = authctxt->methoddata; | |
554 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
fe206de9 | 555 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
556 | gss_buffer_desc gssbuf; | |
0789992b | 557 | OM_uint32 status, ms, flags; |
558 | Buffer b; | |
b6453d99 | 559 | |
b930668c | 560 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
0789992b | 561 | recv_tok, &send_tok, &flags); |
b930668c | 562 | |
563 | if (send_tok.length > 0) { | |
564 | if (GSS_ERROR(status)) | |
565 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
566 | else | |
567 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
b6453d99 | 568 | |
b930668c | 569 | packet_put_string(send_tok.value, send_tok.length); |
570 | packet_send(); | |
571 | gss_release_buffer(&ms, &send_tok); | |
572 | } | |
b6453d99 | 573 | |
b930668c | 574 | if (status == GSS_S_COMPLETE) { |
0789992b | 575 | /* send either complete or MIC, depending on mechanism */ |
576 | if (!(flags & GSS_C_INTEG_FLAG)) { | |
577 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); | |
578 | packet_send(); | |
579 | } else { | |
580 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
581 | authctxt->service, "gssapi-with-mic"); | |
582 | ||
583 | gssbuf.value = buffer_ptr(&b); | |
584 | gssbuf.length = buffer_len(&b); | |
b6453d99 | 585 | |
0789992b | 586 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
b6453d99 | 587 | |
0789992b | 588 | if (!GSS_ERROR(status)) { |
589 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
590 | packet_put_string(mic.value, mic.length); | |
b6453d99 | 591 | |
0789992b | 592 | packet_send(); |
593 | } | |
b6453d99 | 594 | |
0789992b | 595 | buffer_free(&b); |
596 | gss_release_buffer(&ms, &mic); | |
b6453d99 | 597 | } |
b930668c | 598 | } |
b6453d99 | 599 | |
b930668c | 600 | return status; |
601 | } | |
602 | ||
7364bd04 | 603 | void |
604 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) | |
605 | { | |
606 | Authctxt *authctxt = ctxt; | |
607 | Gssctxt *gssctxt; | |
7364bd04 | 608 | int oidlen; |
609 | char *oidv; | |
7364bd04 | 610 | |
611 | if (authctxt == NULL) | |
612 | fatal("input_gssapi_response: no authentication context"); | |
613 | gssctxt = authctxt->methoddata; | |
614 | ||
615 | /* Setup our OID */ | |
616 | oidv = packet_get_string(&oidlen); | |
617 | ||
d8d9afd0 | 618 | if (oidlen <= 2 || |
619 | oidv[0] != SSH_GSS_OIDTYPE || | |
620 | oidv[1] != oidlen - 2) { | |
b930668c | 621 | xfree(oidv); |
d8d9afd0 | 622 | debug("Badly encoded mechanism OID received"); |
623 | userauth(authctxt, NULL); | |
d8d9afd0 | 624 | return; |
7364bd04 | 625 | } |
626 | ||
d8d9afd0 | 627 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
628 | fatal("Server returned different OID than expected"); | |
629 | ||
7364bd04 | 630 | packet_check_eom(); |
631 | ||
632 | xfree(oidv); | |
633 | ||
b930668c | 634 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
7364bd04 | 635 | /* Start again with next method on list */ |
636 | debug("Trying to start again"); | |
637 | userauth(authctxt, NULL); | |
638 | return; | |
639 | } | |
7364bd04 | 640 | } |
641 | ||
642 | void | |
643 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) | |
644 | { | |
645 | Authctxt *authctxt = ctxt; | |
7364bd04 | 646 | gss_buffer_desc recv_tok; |
b930668c | 647 | OM_uint32 status; |
7364bd04 | 648 | u_int slen; |
649 | ||
650 | if (authctxt == NULL) | |
651 | fatal("input_gssapi_response: no authentication context"); | |
7364bd04 | 652 | |
653 | recv_tok.value = packet_get_string(&slen); | |
654 | recv_tok.length = slen; /* safe typecast */ | |
655 | ||
656 | packet_check_eom(); | |
657 | ||
b930668c | 658 | status = process_gssapi_token(ctxt, &recv_tok); |
7364bd04 | 659 | |
660 | xfree(recv_tok.value); | |
661 | ||
662 | if (GSS_ERROR(status)) { | |
7364bd04 | 663 | /* Start again with the next method in the list */ |
664 | userauth(authctxt, NULL); | |
665 | return; | |
666 | } | |
7364bd04 | 667 | } |
668 | ||
669 | void | |
670 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
671 | { | |
672 | Authctxt *authctxt = ctxt; | |
673 | Gssctxt *gssctxt; | |
674 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
675 | gss_buffer_desc recv_tok; | |
676 | OM_uint32 status, ms; | |
f99e1ca4 | 677 | u_int len; |
7364bd04 | 678 | |
679 | if (authctxt == NULL) | |
680 | fatal("input_gssapi_response: no authentication context"); | |
681 | gssctxt = authctxt->methoddata; | |
682 | ||
f99e1ca4 | 683 | recv_tok.value = packet_get_string(&len); |
684 | recv_tok.length = len; | |
7364bd04 | 685 | |
686 | packet_check_eom(); | |
687 | ||
688 | /* Stick it into GSSAPI and see what it says */ | |
689 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
4e2e5cfd | 690 | &recv_tok, &send_tok, NULL); |
7364bd04 | 691 | |
692 | xfree(recv_tok.value); | |
693 | gss_release_buffer(&ms, &send_tok); | |
694 | ||
695 | /* Server will be returning a failed packet after this one */ | |
696 | } | |
697 | ||
698 | void | |
699 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
700 | { | |
701 | OM_uint32 maj, min; | |
702 | char *msg; | |
703 | char *lang; | |
704 | ||
705 | maj=packet_get_int(); | |
706 | min=packet_get_int(); | |
707 | msg=packet_get_string(NULL); | |
708 | lang=packet_get_string(NULL); | |
709 | ||
710 | packet_check_eom(); | |
711 | ||
17318dd6 | 712 | debug("Server GSSAPI Error:\n%s", msg); |
7364bd04 | 713 | xfree(msg); |
714 | xfree(lang); | |
715 | } | |
716 | #endif /* GSSAPI */ | |
717 | ||
94ec8c6b | 718 | int |
719 | userauth_none(Authctxt *authctxt) | |
720 | { | |
721 | /* initial userauth request */ | |
722 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
723 | packet_put_cstring(authctxt->server_user); | |
724 | packet_put_cstring(authctxt->service); | |
725 | packet_put_cstring(authctxt->method->name); | |
726 | packet_send(); | |
94ec8c6b | 727 | return 1; |
728 | } | |
729 | ||
a306f2dd | 730 | int |
188adeb2 | 731 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 732 | { |
1d1ffb87 | 733 | static int attempt = 0; |
67ec167d | 734 | char prompt[150]; |
a306f2dd | 735 | char *password; |
736 | ||
fa649821 | 737 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 738 | return 0; |
739 | ||
6aacefa7 | 740 | if (attempt != 1) |
fa649821 | 741 | error("Permission denied, please try again."); |
742 | ||
f72e01a5 | 743 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 744 | authctxt->server_user, authctxt->host); |
a306f2dd | 745 | password = read_passphrase(prompt, 0); |
746 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 747 | packet_put_cstring(authctxt->server_user); |
748 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 749 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 750 | packet_put_char(0); |
a6215e53 | 751 | packet_put_cstring(password); |
a306f2dd | 752 | memset(password, 0, strlen(password)); |
753 | xfree(password); | |
b4b701be | 754 | packet_add_padding(64); |
a306f2dd | 755 | packet_send(); |
67ec167d | 756 | |
7203d6bb | 757 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
67ec167d | 758 | &input_userauth_passwd_changereq); |
759 | ||
a306f2dd | 760 | return 1; |
761 | } | |
67ec167d | 762 | /* |
763 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
764 | */ | |
765 | void | |
ef077e37 | 766 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
67ec167d | 767 | { |
768 | Authctxt *authctxt = ctxt; | |
769 | char *info, *lang, *password = NULL, *retype = NULL; | |
770 | char prompt[150]; | |
771 | ||
772 | debug2("input_userauth_passwd_changereq"); | |
773 | ||
774 | if (authctxt == NULL) | |
775 | fatal("input_userauth_passwd_changereq: " | |
776 | "no authentication context"); | |
777 | ||
778 | info = packet_get_string(NULL); | |
779 | lang = packet_get_string(NULL); | |
780 | if (strlen(info) > 0) | |
bbe88b6d | 781 | logit("%s", info); |
67ec167d | 782 | xfree(info); |
783 | xfree(lang); | |
784 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
785 | packet_put_cstring(authctxt->server_user); | |
786 | packet_put_cstring(authctxt->service); | |
787 | packet_put_cstring(authctxt->method->name); | |
788 | packet_put_char(1); /* additional info */ | |
7203d6bb | 789 | snprintf(prompt, sizeof(prompt), |
67ec167d | 790 | "Enter %.30s@%.128s's old password: ", |
791 | authctxt->server_user, authctxt->host); | |
792 | password = read_passphrase(prompt, 0); | |
793 | packet_put_cstring(password); | |
794 | memset(password, 0, strlen(password)); | |
795 | xfree(password); | |
796 | password = NULL; | |
797 | while (password == NULL) { | |
7203d6bb | 798 | snprintf(prompt, sizeof(prompt), |
67ec167d | 799 | "Enter %.30s@%.128s's new password: ", |
800 | authctxt->server_user, authctxt->host); | |
801 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
802 | if (password == NULL) { | |
803 | /* bail out */ | |
804 | return; | |
805 | } | |
7203d6bb | 806 | snprintf(prompt, sizeof(prompt), |
67ec167d | 807 | "Retype %.30s@%.128s's new password: ", |
808 | authctxt->server_user, authctxt->host); | |
809 | retype = read_passphrase(prompt, 0); | |
810 | if (strcmp(password, retype) != 0) { | |
811 | memset(password, 0, strlen(password)); | |
812 | xfree(password); | |
bbe88b6d | 813 | logit("Mismatch; try again, EOF to quit."); |
67ec167d | 814 | password = NULL; |
815 | } | |
816 | memset(retype, 0, strlen(retype)); | |
817 | xfree(retype); | |
818 | } | |
819 | packet_put_cstring(password); | |
820 | memset(password, 0, strlen(password)); | |
821 | xfree(password); | |
822 | packet_add_padding(64); | |
823 | packet_send(); | |
7203d6bb | 824 | |
825 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
67ec167d | 826 | &input_userauth_passwd_changereq); |
827 | } | |
a306f2dd | 828 | |
43348518 | 829 | static int |
830 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
831 | u_char *data, u_int datalen) | |
832 | { | |
833 | Key *prv; | |
834 | int ret; | |
835 | ||
836 | /* the agent supports this key */ | |
837 | if (id->ac) | |
838 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
839 | data, datalen)); | |
840 | /* | |
841 | * we have already loaded the private key or | |
842 | * the private key is stored in external hardware | |
843 | */ | |
844 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
845 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
846 | /* load the private key from the file */ | |
847 | if ((prv = load_identity_file(id->filename)) == NULL) | |
848 | return (-1); | |
849 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
850 | key_free(prv); | |
851 | return (ret); | |
fee56204 | 852 | } |
853 | ||
396c147e | 854 | static int |
43348518 | 855 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
a306f2dd | 856 | { |
857 | Buffer b; | |
1e3b8b07 | 858 | u_char *blob, *signature; |
c66f9d0e | 859 | u_int bloblen, slen; |
a27002e5 | 860 | u_int skip = 0; |
2e73a022 | 861 | int ret = -1; |
94ec8c6b | 862 | int have_sig = 1; |
a306f2dd | 863 | |
cbc5abf9 | 864 | debug3("sign_and_send_pubkey"); |
fee56204 | 865 | |
43348518 | 866 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fa08c86b | 867 | /* we cannot handle this key */ |
cbc5abf9 | 868 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 869 | return 0; |
870 | } | |
a306f2dd | 871 | /* data to be signed */ |
872 | buffer_init(&b); | |
33de75a3 | 873 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 874 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 875 | skip = session_id2_len; |
33de75a3 | 876 | } else { |
877 | buffer_put_string(&b, session_id2, session_id2_len); | |
878 | skip = buffer_len(&b); | |
74fc9186 | 879 | } |
a306f2dd | 880 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 881 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 882 | buffer_put_cstring(&b, |
cbc5abf9 | 883 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 884 | "ssh-userauth" : |
188adeb2 | 885 | authctxt->service); |
cbc5abf9 | 886 | if (datafellows & SSH_BUG_PKAUTH) { |
887 | buffer_put_char(&b, have_sig); | |
888 | } else { | |
889 | buffer_put_cstring(&b, authctxt->method->name); | |
890 | buffer_put_char(&b, have_sig); | |
43348518 | 891 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
cbc5abf9 | 892 | } |
a306f2dd | 893 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 894 | |
895 | /* generate signature */ | |
43348518 | 896 | ret = identity_sign(id, &signature, &slen, |
fee56204 | 897 | buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 898 | if (ret == -1) { |
899 | xfree(blob); | |
900 | buffer_free(&b); | |
901 | return 0; | |
902 | } | |
fa08c86b | 903 | #ifdef DEBUG_PK |
a306f2dd | 904 | buffer_dump(&b); |
905 | #endif | |
cbc5abf9 | 906 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 907 | buffer_clear(&b); |
908 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 909 | skip = session_id2_len; |
d0c832f3 | 910 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 911 | buffer_put_cstring(&b, authctxt->server_user); |
912 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 913 | buffer_put_cstring(&b, authctxt->method->name); |
914 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 915 | if (!(datafellows & SSH_BUG_PKAUTH)) |
43348518 | 916 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
d0c832f3 | 917 | buffer_put_string(&b, blob, bloblen); |
918 | } | |
919 | xfree(blob); | |
fee56204 | 920 | |
a306f2dd | 921 | /* append signature */ |
922 | buffer_put_string(&b, signature, slen); | |
923 | xfree(signature); | |
924 | ||
925 | /* skip session id and packet type */ | |
74fc9186 | 926 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 927 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 928 | buffer_consume(&b, skip + 1); |
a306f2dd | 929 | |
930 | /* put remaining data from buffer into packet */ | |
931 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
932 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
933 | buffer_free(&b); | |
a306f2dd | 934 | packet_send(); |
2e73a022 | 935 | |
936 | return 1; | |
4c8722d9 | 937 | } |
938 | ||
396c147e | 939 | static int |
43348518 | 940 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
4c8722d9 | 941 | { |
fee56204 | 942 | u_char *blob; |
21b30f38 | 943 | u_int bloblen, have_sig = 0; |
4c8722d9 | 944 | |
fee56204 | 945 | debug3("send_pubkey_test"); |
946 | ||
43348518 | 947 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
fee56204 | 948 | /* we cannot handle this key */ |
949 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 950 | return 0; |
951 | } | |
fee56204 | 952 | /* register callback for USERAUTH_PK_OK message */ |
fee56204 | 953 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
4c8722d9 | 954 | |
fee56204 | 955 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
956 | packet_put_cstring(authctxt->server_user); | |
957 | packet_put_cstring(authctxt->service); | |
958 | packet_put_cstring(authctxt->method->name); | |
959 | packet_put_char(have_sig); | |
960 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
43348518 | 961 | packet_put_cstring(key_ssh_name(id->key)); |
fee56204 | 962 | packet_put_string(blob, bloblen); |
963 | xfree(blob); | |
964 | packet_send(); | |
965 | return 1; | |
966 | } | |
967 | ||
396c147e | 968 | static Key * |
fee56204 | 969 | load_identity_file(char *filename) |
970 | { | |
971 | Key *private; | |
972 | char prompt[300], *passphrase; | |
fc231518 | 973 | int perm_ok, quit, i; |
d156519a | 974 | struct stat st; |
fee56204 | 975 | |
d156519a | 976 | if (stat(filename, &st) < 0) { |
977 | debug3("no such identity: %s", filename); | |
978 | return NULL; | |
979 | } | |
fc231518 | 980 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
981 | if (!perm_ok) | |
982 | return NULL; | |
aeaa3d9e | 983 | if (private == NULL) { |
984 | if (options.batch_mode) | |
fee56204 | 985 | return NULL; |
4c8722d9 | 986 | snprintf(prompt, sizeof prompt, |
184eed6a | 987 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 988 | for (i = 0; i < options.number_of_password_prompts; i++) { |
989 | passphrase = read_passphrase(prompt, 0); | |
990 | if (strcmp(passphrase, "") != 0) { | |
fc231518 | 991 | private = key_load_private_type(KEY_UNSPEC, |
992 | filename, passphrase, NULL, NULL); | |
fee56204 | 993 | quit = 0; |
188adeb2 | 994 | } else { |
995 | debug2("no passphrase given, try next key"); | |
fee56204 | 996 | quit = 1; |
188adeb2 | 997 | } |
998 | memset(passphrase, 0, strlen(passphrase)); | |
999 | xfree(passphrase); | |
aeaa3d9e | 1000 | if (private != NULL || quit) |
188adeb2 | 1001 | break; |
1002 | debug2("bad passphrase given, try again..."); | |
1003 | } | |
4c8722d9 | 1004 | } |
fee56204 | 1005 | return private; |
1006 | } | |
1007 | ||
43348518 | 1008 | /* |
1009 | * try keys in the following order: | |
1010 | * 1. agent keys that are found in the config file | |
1011 | * 2. other agent keys | |
1012 | * 3. keys that are only listed in the config file | |
1013 | */ | |
1014 | static void | |
1015 | pubkey_prepare(Authctxt *authctxt) | |
fee56204 | 1016 | { |
43348518 | 1017 | Identity *id; |
1018 | Idlist agent, files, *preferred; | |
1019 | Key *key; | |
1020 | AuthenticationConnection *ac; | |
1021 | char *comment; | |
1022 | int i, found; | |
1023 | ||
1024 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1025 | TAILQ_INIT(&files); /* keys from the config file */ | |
1026 | preferred = &authctxt->keys; | |
1027 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1028 | ||
1029 | /* list of keys stored in the filesystem */ | |
1030 | for (i = 0; i < options.num_identity_files; i++) { | |
1031 | key = options.identity_keys[i]; | |
1032 | if (key && key->type == KEY_RSA1) | |
1033 | continue; | |
1034 | options.identity_keys[i] = NULL; | |
52e3daed | 1035 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1036 | id->key = key; |
1037 | id->filename = xstrdup(options.identity_files[i]); | |
1038 | TAILQ_INSERT_TAIL(&files, id, next); | |
1039 | } | |
1040 | /* list of keys supported by the agent */ | |
1041 | if ((ac = ssh_get_authentication_connection())) { | |
1042 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1043 | key != NULL; | |
1044 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1045 | found = 0; | |
1046 | TAILQ_FOREACH(id, &files, next) { | |
aff51935 | 1047 | /* agent keys from the config file are preferred */ |
43348518 | 1048 | if (key_equal(key, id->key)) { |
1049 | key_free(key); | |
1050 | xfree(comment); | |
1051 | TAILQ_REMOVE(&files, id, next); | |
1052 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1053 | id->ac = ac; | |
1054 | found = 1; | |
1055 | break; | |
1056 | } | |
1057 | } | |
3a065ed0 | 1058 | if (!found && !options.identities_only) { |
52e3daed | 1059 | id = xcalloc(1, sizeof(*id)); |
43348518 | 1060 | id->key = key; |
1061 | id->filename = comment; | |
1062 | id->ac = ac; | |
1063 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1064 | } | |
1065 | } | |
1066 | /* append remaining agent keys */ | |
1067 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1068 | TAILQ_REMOVE(&agent, id, next); | |
1069 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1070 | } | |
1071 | authctxt->agent = ac; | |
1072 | } | |
1073 | /* append remaining keys from the config file */ | |
1074 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1075 | TAILQ_REMOVE(&files, id, next); | |
1076 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1077 | } | |
1078 | TAILQ_FOREACH(id, preferred, next) { | |
1079 | debug2("key: %s (%p)", id->filename, id->key); | |
1080 | } | |
fee56204 | 1081 | } |
1082 | ||
43348518 | 1083 | static void |
1084 | pubkey_cleanup(Authctxt *authctxt) | |
2e73a022 | 1085 | { |
43348518 | 1086 | Identity *id; |
1087 | ||
1088 | if (authctxt->agent != NULL) | |
1089 | ssh_close_authentication_connection(authctxt->agent); | |
1090 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1091 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1092 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1093 | if (id->key) | |
1094 | key_free(id->key); | |
1095 | if (id->filename) | |
1096 | xfree(id->filename); | |
1097 | xfree(id); | |
2e73a022 | 1098 | } |
a306f2dd | 1099 | } |
1100 | ||
188adeb2 | 1101 | int |
1102 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 1103 | { |
43348518 | 1104 | Identity *id; |
188adeb2 | 1105 | int sent = 0; |
1106 | ||
43348518 | 1107 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1108 | if (id->tried++) | |
1109 | return (0); | |
b56e99e2 | 1110 | /* move key to the end of the queue */ |
43348518 | 1111 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1112 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1113 | /* | |
1114 | * send a test message if we have the public key. for | |
1115 | * encrypted keys we cannot do this and have to load the | |
1116 | * private key instead | |
1117 | */ | |
1118 | if (id->key && id->key->type != KEY_RSA1) { | |
1119 | debug("Offering public key: %s", id->filename); | |
1120 | sent = send_pubkey_test(authctxt, id); | |
1121 | } else if (id->key == NULL) { | |
1122 | debug("Trying private key: %s", id->filename); | |
1123 | id->key = load_identity_file(id->filename); | |
1124 | if (id->key != NULL) { | |
1125 | id->isprivate = 1; | |
1126 | sent = sign_and_send_pubkey(authctxt, id); | |
1127 | key_free(id->key); | |
1128 | id->key = NULL; | |
fee56204 | 1129 | } |
fee56204 | 1130 | } |
43348518 | 1131 | if (sent) |
1132 | return (sent); | |
fa08c86b | 1133 | } |
43348518 | 1134 | return (0); |
188adeb2 | 1135 | } |
a306f2dd | 1136 | |
94ec8c6b | 1137 | /* |
1138 | * Send userauth request message specifying keyboard-interactive method. | |
1139 | */ | |
1140 | int | |
1141 | userauth_kbdint(Authctxt *authctxt) | |
1142 | { | |
1143 | static int attempt = 0; | |
1144 | ||
1145 | if (attempt++ >= options.number_of_password_prompts) | |
1146 | return 0; | |
6b759005 | 1147 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
1148 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1149 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1150 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1151 | return 0; | |
1152 | } | |
94ec8c6b | 1153 | |
1154 | debug2("userauth_kbdint"); | |
1155 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1156 | packet_put_cstring(authctxt->server_user); | |
1157 | packet_put_cstring(authctxt->service); | |
1158 | packet_put_cstring(authctxt->method->name); | |
1159 | packet_put_cstring(""); /* lang */ | |
1160 | packet_put_cstring(options.kbd_interactive_devices ? | |
1161 | options.kbd_interactive_devices : ""); | |
1162 | packet_send(); | |
94ec8c6b | 1163 | |
1164 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1165 | return 1; | |
1166 | } | |
1167 | ||
1168 | /* | |
f72e01a5 | 1169 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 1170 | */ |
1171 | void | |
7819b5c3 | 1172 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 1173 | { |
1174 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 1175 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 1176 | u_int num_prompts, i; |
94ec8c6b | 1177 | int echo = 0; |
1178 | ||
1179 | debug2("input_userauth_info_req"); | |
1180 | ||
1181 | if (authctxt == NULL) | |
1182 | fatal("input_userauth_info_req: no authentication context"); | |
1183 | ||
6b759005 | 1184 | authctxt->info_req_seen = 1; |
1185 | ||
94ec8c6b | 1186 | name = packet_get_string(NULL); |
1187 | inst = packet_get_string(NULL); | |
1188 | lang = packet_get_string(NULL); | |
94ec8c6b | 1189 | if (strlen(name) > 0) |
bbe88b6d | 1190 | logit("%s", name); |
94ec8c6b | 1191 | if (strlen(inst) > 0) |
bbe88b6d | 1192 | logit("%s", inst); |
f72e01a5 | 1193 | xfree(name); |
94ec8c6b | 1194 | xfree(inst); |
f72e01a5 | 1195 | xfree(lang); |
94ec8c6b | 1196 | |
1197 | num_prompts = packet_get_int(); | |
1198 | /* | |
1199 | * Begin to build info response packet based on prompts requested. | |
1200 | * We commit to providing the correct number of responses, so if | |
1201 | * further on we run into a problem that prevents this, we have to | |
1202 | * be sure and clean this up and send a correct error response. | |
1203 | */ | |
1204 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1205 | packet_put_int(num_prompts); | |
1206 | ||
5ba55ada | 1207 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 1208 | for (i = 0; i < num_prompts; i++) { |
1209 | prompt = packet_get_string(NULL); | |
1210 | echo = packet_get_char(); | |
1211 | ||
1843a425 | 1212 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 1213 | |
a6215e53 | 1214 | packet_put_cstring(response); |
94ec8c6b | 1215 | memset(response, 0, strlen(response)); |
1216 | xfree(response); | |
1217 | xfree(prompt); | |
1218 | } | |
95500969 | 1219 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 1220 | |
b4b701be | 1221 | packet_add_padding(64); |
94ec8c6b | 1222 | packet_send(); |
94ec8c6b | 1223 | } |
a306f2dd | 1224 | |
39c00dc2 | 1225 | static int |
d6133f43 | 1226 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
39c00dc2 | 1227 | u_char *data, u_int datalen) |
1228 | { | |
1229 | Buffer b; | |
7091a26b | 1230 | struct stat st; |
39c00dc2 | 1231 | pid_t pid; |
d4826734 | 1232 | int to[2], from[2], status, version = 2; |
39c00dc2 | 1233 | |
6226a8f8 | 1234 | debug2("ssh_keysign called"); |
39c00dc2 | 1235 | |
7091a26b | 1236 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
1237 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1238 | return -1; | |
1239 | } | |
39c00dc2 | 1240 | if (fflush(stdout) != 0) |
1241 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1242 | if (pipe(to) < 0) { | |
1243 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1244 | return -1; | |
1245 | } | |
1246 | if (pipe(from) < 0) { | |
1247 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1248 | return -1; | |
1249 | } | |
1250 | if ((pid = fork()) < 0) { | |
1251 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1252 | return -1; | |
1253 | } | |
1254 | if (pid == 0) { | |
1255 | seteuid(getuid()); | |
1256 | setuid(getuid()); | |
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 | } |