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5262cbfb | 1 | /* $OpenBSD: sshconnect2.c,v 1.170 2008/11/04 08:22:13 djm Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
5262cbfb | 4 | * Copyright (c) 2008 Damien Miller. All rights reserved. |
3c0ef626 | 5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
30460aeb | 28 | |
29 | #include <sys/types.h> | |
30 | #include <sys/socket.h> | |
31 | #include <sys/wait.h> | |
32 | #include <sys/stat.h> | |
33 | ||
34 | #include <errno.h> | |
fa0f0f45 | 35 | #include <netdb.h> |
30460aeb | 36 | #include <pwd.h> |
37 | #include <signal.h> | |
38 | #include <stdarg.h> | |
39 | #include <stdio.h> | |
40 | #include <string.h> | |
41 | #include <unistd.h> | |
5156b1a1 | 42 | #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) |
43 | #include <vis.h> | |
44 | #endif | |
7cac2b65 | 45 | |
46 | #include "openbsd-compat/sys-queue.h" | |
3c0ef626 | 47 | |
30460aeb | 48 | #include "xmalloc.h" |
3c0ef626 | 49 | #include "ssh.h" |
50 | #include "ssh2.h" | |
3c0ef626 | 51 | #include "buffer.h" |
52 | #include "packet.h" | |
3c0ef626 | 53 | #include "compat.h" |
3c0ef626 | 54 | #include "cipher.h" |
30460aeb | 55 | #include "key.h" |
3c0ef626 | 56 | #include "kex.h" |
57 | #include "myproposal.h" | |
3c0ef626 | 58 | #include "sshconnect.h" |
59 | #include "authfile.h" | |
60 | #include "dh.h" | |
61 | #include "authfd.h" | |
62 | #include "log.h" | |
63 | #include "readconf.h" | |
7e82606e | 64 | #include "misc.h" |
3c0ef626 | 65 | #include "match.h" |
66 | #include "dispatch.h" | |
67 | #include "canohost.h" | |
44a053a3 | 68 | #include "msg.h" |
69 | #include "pathnames.h" | |
30460aeb | 70 | #include "uidswap.h" |
5262cbfb | 71 | #include "jpake.h" |
3c0ef626 | 72 | |
5598e598 | 73 | #ifdef GSSAPI |
74 | #include "ssh-gss.h" | |
75 | #endif | |
76 | ||
3c0ef626 | 77 | /* import */ |
78 | extern char *client_version_string; | |
79 | extern char *server_version_string; | |
80 | extern Options options; | |
473db5ab | 81 | |
82 | /* tty_flag is set in ssh.c. use this in ssh_userauth2 */ | |
83 | /* if it is set then prevent the switch to the null cipher */ | |
84 | ||
85 | extern int tty_flag; | |
3c0ef626 | 86 | |
d3057ca4 | 87 | /* tty_flag is set in ssh.c. use this in ssh_userauth2 */ |
88 | /* if it is set then prevent the switch to the null cipher */ | |
89 | ||
90 | extern int tty_flag; | |
91 | ||
3c0ef626 | 92 | /* |
93 | * SSH2 key exchange | |
94 | */ | |
95 | ||
96 | u_char *session_id2 = NULL; | |
7cac2b65 | 97 | u_int session_id2_len = 0; |
3c0ef626 | 98 | |
99 | char *xxx_host; | |
100 | struct sockaddr *xxx_hostaddr; | |
101 | ||
102 | Kex *xxx_kex = NULL; | |
103 | ||
104 | static int | |
105 | verify_host_key_callback(Key *hostkey) | |
106 | { | |
107 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) | |
108 | fatal("Host key verification failed."); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | void | |
113 | ssh_kex2(char *host, struct sockaddr *hostaddr) | |
114 | { | |
115 | Kex *kex; | |
fe4ad273 | 116 | |
1e608e42 | 117 | #ifdef GSSAPI |
fe4ad273 | 118 | char *orig = NULL, *gss = NULL; |
f713db99 | 119 | char *gss_host = NULL; |
1e608e42 | 120 | #endif |
3c0ef626 | 121 | |
122 | xxx_host = host; | |
123 | xxx_hostaddr = hostaddr; | |
124 | ||
5598e598 | 125 | #ifdef GSSAPI |
7a056ed1 | 126 | if (options.gss_keyex) { |
f713db99 | 127 | /* Add the GSSAPI mechanisms currently supported on this |
128 | * client to the key exchange algorithm proposal */ | |
129 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
130 | ||
131 | if (options.gss_trust_dns) | |
132 | gss_host = (char *)get_canonical_hostname(1); | |
133 | else | |
134 | gss_host = host; | |
135 | ||
136 | gss = ssh_gssapi_client_mechanisms(gss_host); | |
137 | if (gss) { | |
138 | debug("Offering GSSAPI proposal: %s", gss); | |
139 | xasprintf(&myproposal[PROPOSAL_KEX_ALGS], | |
140 | "%s,%s", gss, orig); | |
141 | } | |
7a056ed1 | 142 | } |
5598e598 | 143 | #endif |
144 | ||
3c0ef626 | 145 | if (options.ciphers == (char *)-1) { |
7cac2b65 | 146 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
3c0ef626 | 147 | options.ciphers = NULL; |
148 | } | |
149 | if (options.ciphers != NULL) { | |
150 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
151 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
4834571d | 152 | } |
3c0ef626 | 153 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
154 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
155 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
156 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
157 | if (options.compression) { | |
158 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
2ce0bfe4 | 159 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
3c0ef626 | 160 | } else { |
161 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
2ce0bfe4 | 162 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
3c0ef626 | 163 | } |
164 | if (options.macs != NULL) { | |
165 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
166 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
167 | } | |
168 | if (options.hostkeyalgorithms != NULL) | |
1e608e42 | 169 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
3c0ef626 | 170 | options.hostkeyalgorithms; |
171 | ||
1e608e42 | 172 | #ifdef GSSAPI |
fe4ad273 | 173 | /* If we've got GSSAPI algorithms, then we also support the |
174 | * 'null' hostkey, as a last resort */ | |
7a056ed1 | 175 | if (options.gss_keyex && gss) { |
fe4ad273 | 176 | orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]; |
f713db99 | 177 | xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS], |
fe4ad273 | 178 | "%s,null", orig); |
1e608e42 | 179 | } |
180 | #endif | |
7cac2b65 | 181 | |
182 | if (options.rekey_limit) | |
e74dc197 | 183 | packet_set_rekey_limit((u_int32_t)options.rekey_limit); |
7cac2b65 | 184 | |
3c0ef626 | 185 | /* start key exchange */ |
186 | kex = kex_setup(myproposal); | |
bfe49944 | 187 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
7e82606e | 188 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
bfe49944 | 189 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
f713db99 | 190 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
bfe49944 | 191 | #ifdef GSSAPI |
192 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client; | |
f713db99 | 193 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_client; |
fe4ad273 | 194 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_client; |
bfe49944 | 195 | #endif |
3c0ef626 | 196 | kex->client_version_string=client_version_string; |
197 | kex->server_version_string=server_version_string; | |
198 | kex->verify_host_key=&verify_host_key_callback; | |
7cac2b65 | 199 | |
fe4ad273 | 200 | #ifdef GSSAPI |
201 | kex->gss_deleg_creds = options.gss_deleg_creds; | |
202 | kex->gss_trust_dns = options.gss_trust_dns; | |
203 | kex->gss_host = gss_host; | |
204 | #endif | |
205 | ||
3c0ef626 | 206 | xxx_kex = kex; |
207 | ||
208 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
209 | ||
210 | session_id2 = kex->session_id; | |
211 | session_id2_len = kex->session_id_len; | |
212 | ||
213 | #ifdef DEBUG_KEXDH | |
214 | /* send 1st encrypted/maced/compressed message */ | |
215 | packet_start(SSH2_MSG_IGNORE); | |
216 | packet_put_cstring("markus"); | |
217 | packet_send(); | |
218 | packet_write_wait(); | |
219 | #endif | |
3c0ef626 | 220 | } |
221 | ||
222 | /* | |
223 | * Authenticate user | |
224 | */ | |
225 | ||
226 | typedef struct Authctxt Authctxt; | |
227 | typedef struct Authmethod Authmethod; | |
7cac2b65 | 228 | typedef struct identity Identity; |
229 | typedef struct idlist Idlist; | |
230 | ||
231 | struct identity { | |
232 | TAILQ_ENTRY(identity) next; | |
233 | AuthenticationConnection *ac; /* set if agent supports key */ | |
234 | Key *key; /* public/private key */ | |
235 | char *filename; /* comment for agent-only keys */ | |
236 | int tried; | |
237 | int isprivate; /* key points to the private key */ | |
238 | }; | |
239 | TAILQ_HEAD(idlist, identity); | |
3c0ef626 | 240 | |
241 | struct Authctxt { | |
242 | const char *server_user; | |
243 | const char *local_user; | |
244 | const char *host; | |
245 | const char *service; | |
246 | Authmethod *method; | |
247 | int success; | |
248 | char *authlist; | |
249 | /* pubkey */ | |
7cac2b65 | 250 | Idlist keys; |
3c0ef626 | 251 | AuthenticationConnection *agent; |
252 | /* hostbased */ | |
44a053a3 | 253 | Sensitive *sensitive; |
3c0ef626 | 254 | /* kbd-interactive */ |
255 | int info_req_seen; | |
5598e598 | 256 | /* generic */ |
257 | void *methoddata; | |
3c0ef626 | 258 | }; |
259 | struct Authmethod { | |
260 | char *name; /* string to compare against server's list */ | |
261 | int (*userauth)(Authctxt *authctxt); | |
5262cbfb | 262 | void (*cleanup)(Authctxt *authctxt); |
3c0ef626 | 263 | int *enabled; /* flag in option struct that enables method */ |
264 | int *batch_flag; /* flag in option struct that disables method */ | |
265 | }; | |
266 | ||
1e608e42 | 267 | void input_userauth_success(int, u_int32_t, void *); |
268 | void input_userauth_failure(int, u_int32_t, void *); | |
269 | void input_userauth_banner(int, u_int32_t, void *); | |
270 | void input_userauth_error(int, u_int32_t, void *); | |
271 | void input_userauth_info_req(int, u_int32_t, void *); | |
272 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
510132b6 | 273 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
5262cbfb | 274 | void input_userauth_jpake_server_step1(int, u_int32_t, void *); |
275 | void input_userauth_jpake_server_step2(int, u_int32_t, void *); | |
276 | void input_userauth_jpake_server_confirm(int, u_int32_t, void *); | |
3c0ef626 | 277 | |
1e608e42 | 278 | int userauth_none(Authctxt *); |
279 | int userauth_pubkey(Authctxt *); | |
280 | int userauth_passwd(Authctxt *); | |
281 | int userauth_kbdint(Authctxt *); | |
282 | int userauth_hostbased(Authctxt *); | |
5262cbfb | 283 | int userauth_jpake(Authctxt *); |
284 | ||
285 | void userauth_jpake_cleanup(Authctxt *); | |
7cac2b65 | 286 | |
5598e598 | 287 | #ifdef GSSAPI |
1e608e42 | 288 | int userauth_external(Authctxt *authctxt); |
289 | int userauth_gssapi(Authctxt *authctxt); | |
540d72c3 | 290 | int userauth_gssapi_with_mic(Authctxt *authctxt); |
291 | int userauth_gssapi_without_mic(Authctxt *authctxt); | |
e23e524c | 292 | void input_gssapi_response(int type, u_int32_t, void *); |
293 | void input_gssapi_token(int type, u_int32_t, void *); | |
294 | void input_gssapi_hash(int type, u_int32_t, void *); | |
23987cb8 | 295 | void input_gssapi_error(int, u_int32_t, void *); |
e23e524c | 296 | void input_gssapi_errtok(int, u_int32_t, void *); |
fe4ad273 | 297 | int userauth_gsskeyex(Authctxt *authctxt); |
5598e598 | 298 | #endif |
299 | ||
1e608e42 | 300 | void userauth(Authctxt *, char *); |
3c0ef626 | 301 | |
7cac2b65 | 302 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
303 | static void pubkey_prepare(Authctxt *); | |
304 | static void pubkey_cleanup(Authctxt *); | |
305 | static Key *load_identity_file(char *); | |
3c0ef626 | 306 | |
307 | static Authmethod *authmethod_get(char *authlist); | |
308 | static Authmethod *authmethod_lookup(const char *name); | |
309 | static char *authmethods_get(void); | |
310 | ||
311 | Authmethod authmethods[] = { | |
5598e598 | 312 | #ifdef GSSAPI |
fe4ad273 | 313 | {"gssapi-keyex", |
314 | userauth_gsskeyex, | |
315 | &options.gss_authentication, | |
316 | NULL}, | |
5598e598 | 317 | {"external-keyx", |
318 | userauth_external, | |
319 | &options.gss_authentication, | |
320 | NULL}, | |
540d72c3 | 321 | {"gssapi-with-mic", |
51b9ca75 | 322 | userauth_gssapi, |
5262cbfb | 323 | NULL, |
540d72c3 | 324 | &options.gss_authentication, |
325 | NULL}, | |
5598e598 | 326 | {"gssapi", |
51b9ca75 | 327 | userauth_gssapi, |
5598e598 | 328 | &options.gss_authentication, |
329 | NULL}, | |
330 | #endif | |
3c0ef626 | 331 | {"hostbased", |
332 | userauth_hostbased, | |
5262cbfb | 333 | NULL, |
3c0ef626 | 334 | &options.hostbased_authentication, |
335 | NULL}, | |
336 | {"publickey", | |
337 | userauth_pubkey, | |
5262cbfb | 338 | NULL, |
3c0ef626 | 339 | &options.pubkey_authentication, |
340 | NULL}, | |
5262cbfb | 341 | #ifdef JPAKE |
342 | {"jpake-01@openssh.com", | |
343 | userauth_jpake, | |
344 | userauth_jpake_cleanup, | |
345 | &options.zero_knowledge_password_authentication, | |
346 | &options.batch_mode}, | |
347 | #endif | |
3c0ef626 | 348 | {"keyboard-interactive", |
349 | userauth_kbdint, | |
5262cbfb | 350 | NULL, |
3c0ef626 | 351 | &options.kbd_interactive_authentication, |
352 | &options.batch_mode}, | |
353 | {"password", | |
354 | userauth_passwd, | |
5262cbfb | 355 | NULL, |
3c0ef626 | 356 | &options.password_authentication, |
357 | &options.batch_mode}, | |
358 | {"none", | |
359 | userauth_none, | |
360 | NULL, | |
5262cbfb | 361 | NULL, |
3c0ef626 | 362 | NULL}, |
5262cbfb | 363 | {NULL, NULL, NULL, NULL, NULL} |
3c0ef626 | 364 | }; |
365 | ||
366 | void | |
367 | ssh_userauth2(const char *local_user, const char *server_user, char *host, | |
44a053a3 | 368 | Sensitive *sensitive) |
3c0ef626 | 369 | { |
370 | Authctxt authctxt; | |
371 | int type; | |
3c0ef626 | 372 | |
373 | if (options.challenge_response_authentication) | |
374 | options.kbd_interactive_authentication = 1; | |
375 | ||
3c0ef626 | 376 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
377 | packet_put_cstring("ssh-userauth"); | |
378 | packet_send(); | |
bfe49944 | 379 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
3c0ef626 | 380 | packet_write_wait(); |
1e608e42 | 381 | type = packet_read(); |
bfe49944 | 382 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
383 | fatal("Server denied authentication request: %d", type); | |
3c0ef626 | 384 | if (packet_remaining() > 0) { |
1e608e42 | 385 | char *reply = packet_get_string(NULL); |
bfe49944 | 386 | debug2("service_accept: %s", reply); |
3c0ef626 | 387 | xfree(reply); |
388 | } else { | |
bfe49944 | 389 | debug2("buggy server: service_accept w/o service"); |
3c0ef626 | 390 | } |
1e608e42 | 391 | packet_check_eom(); |
bfe49944 | 392 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
3c0ef626 | 393 | |
394 | if (options.preferred_authentications == NULL) | |
395 | options.preferred_authentications = authmethods_get(); | |
396 | ||
397 | /* setup authentication context */ | |
398 | memset(&authctxt, 0, sizeof(authctxt)); | |
7cac2b65 | 399 | pubkey_prepare(&authctxt); |
3c0ef626 | 400 | authctxt.server_user = server_user; |
401 | authctxt.local_user = local_user; | |
402 | authctxt.host = host; | |
403 | authctxt.service = "ssh-connection"; /* service name */ | |
404 | authctxt.success = 0; | |
405 | authctxt.method = authmethod_lookup("none"); | |
406 | authctxt.authlist = NULL; | |
5598e598 | 407 | authctxt.methoddata = NULL; |
44a053a3 | 408 | authctxt.sensitive = sensitive; |
3c0ef626 | 409 | authctxt.info_req_seen = 0; |
410 | if (authctxt.method == NULL) | |
411 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
412 | ||
413 | /* initial userauth request */ | |
414 | userauth_none(&authctxt); | |
415 | ||
416 | dispatch_init(&input_userauth_error); | |
417 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
418 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
419 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); | |
420 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
421 | ||
7cac2b65 | 422 | pubkey_cleanup(&authctxt); |
423 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); | |
f713db99 | 424 | |
425 | /* if the user wants to use the none cipher do it */ | |
426 | /* post authentication and only if the right conditions are met */ | |
427 | /* both of the NONE commands must be true and there must be no */ | |
428 | /* tty allocated */ | |
429 | if ((options.none_switch == 1) && (options.none_enabled == 1)) | |
473db5ab | 430 | { |
f713db99 | 431 | if (!tty_flag) /* no null on tty sessions */ |
432 | { | |
433 | debug("Requesting none rekeying..."); | |
434 | myproposal[PROPOSAL_ENC_ALGS_STOC] = "none"; | |
435 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = "none"; | |
436 | kex_prop2buf(&xxx_kex->my,myproposal); | |
437 | packet_request_rekeying(); | |
438 | fprintf(stderr, "WARNING: ENABLED NONE CIPHER\n"); | |
439 | } | |
440 | else | |
441 | { | |
442 | /* requested NONE cipher when in a tty */ | |
443 | debug("Cannot switch to NONE cipher with tty allocated"); | |
444 | fprintf(stderr, "NONE cipher switch disabled when a TTY is allocated\n"); | |
445 | } | |
473db5ab | 446 | } |
bfe49944 | 447 | debug("Authentication succeeded (%s).", authctxt.method->name); |
3c0ef626 | 448 | } |
7cac2b65 | 449 | |
3c0ef626 | 450 | void |
451 | userauth(Authctxt *authctxt, char *authlist) | |
452 | { | |
5262cbfb | 453 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
454 | authctxt->method->cleanup(authctxt); | |
455 | ||
7cac2b65 | 456 | if (authctxt->methoddata) { |
5598e598 | 457 | xfree(authctxt->methoddata); |
7cac2b65 | 458 | authctxt->methoddata = NULL; |
5598e598 | 459 | } |
3c0ef626 | 460 | if (authlist == NULL) { |
461 | authlist = authctxt->authlist; | |
462 | } else { | |
463 | if (authctxt->authlist) | |
464 | xfree(authctxt->authlist); | |
465 | authctxt->authlist = authlist; | |
466 | } | |
467 | for (;;) { | |
468 | Authmethod *method = authmethod_get(authlist); | |
469 | if (method == NULL) | |
470 | fatal("Permission denied (%s).", authlist); | |
471 | authctxt->method = method; | |
7cac2b65 | 472 | |
473 | /* reset the per method handler */ | |
474 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
475 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
476 | ||
477 | /* and try new method */ | |
3c0ef626 | 478 | if (method->userauth(authctxt) != 0) { |
479 | debug2("we sent a %s packet, wait for reply", method->name); | |
480 | break; | |
481 | } else { | |
482 | debug2("we did not send a packet, disable method"); | |
483 | method->enabled = NULL; | |
484 | } | |
485 | } | |
486 | } | |
276b07a3 | 487 | |
5262cbfb | 488 | /* ARGSUSED */ |
3c0ef626 | 489 | void |
1e608e42 | 490 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 491 | { |
492 | fatal("input_userauth_error: bad message during authentication: " | |
2ce0bfe4 | 493 | "type %d", type); |
3c0ef626 | 494 | } |
276b07a3 | 495 | |
5262cbfb | 496 | /* ARGSUSED */ |
3c0ef626 | 497 | void |
1e608e42 | 498 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 499 | { |
5156b1a1 | 500 | char *msg, *raw, *lang; |
501 | u_int len; | |
540d72c3 | 502 | |
3c0ef626 | 503 | debug3("input_userauth_banner"); |
5156b1a1 | 504 | raw = packet_get_string(&len); |
3c0ef626 | 505 | lang = packet_get_string(NULL); |
5262cbfb | 506 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) { |
5156b1a1 | 507 | if (len > 65536) |
508 | len = 65536; | |
5262cbfb | 509 | msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */ |
510 | strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL); | |
540d72c3 | 511 | fprintf(stderr, "%s", msg); |
5156b1a1 | 512 | xfree(msg); |
513 | } | |
514 | xfree(raw); | |
3c0ef626 | 515 | xfree(lang); |
516 | } | |
276b07a3 | 517 | |
5262cbfb | 518 | /* ARGSUSED */ |
3c0ef626 | 519 | void |
1e608e42 | 520 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 521 | { |
522 | Authctxt *authctxt = ctxt; | |
523 | if (authctxt == NULL) | |
524 | fatal("input_userauth_success: no authentication context"); | |
540d72c3 | 525 | if (authctxt->authlist) { |
3c0ef626 | 526 | xfree(authctxt->authlist); |
540d72c3 | 527 | authctxt->authlist = NULL; |
528 | } | |
529 | if (authctxt->methoddata) { | |
5598e598 | 530 | xfree(authctxt->methoddata); |
540d72c3 | 531 | authctxt->methoddata = NULL; |
532 | } | |
3c0ef626 | 533 | authctxt->success = 1; /* break out */ |
534 | } | |
276b07a3 | 535 | |
5262cbfb | 536 | /* ARGSUSED */ |
3c0ef626 | 537 | void |
1e608e42 | 538 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 539 | { |
540 | Authctxt *authctxt = ctxt; | |
541 | char *authlist = NULL; | |
542 | int partial; | |
543 | ||
544 | if (authctxt == NULL) | |
545 | fatal("input_userauth_failure: no authentication context"); | |
546 | ||
547 | authlist = packet_get_string(NULL); | |
548 | partial = packet_get_char(); | |
1e608e42 | 549 | packet_check_eom(); |
3c0ef626 | 550 | |
551 | if (partial != 0) | |
7cac2b65 | 552 | logit("Authenticated with partial success."); |
bfe49944 | 553 | debug("Authentications that can continue: %s", authlist); |
3c0ef626 | 554 | |
3c0ef626 | 555 | userauth(authctxt, authlist); |
556 | } | |
5262cbfb | 557 | |
558 | /* ARGSUSED */ | |
3c0ef626 | 559 | void |
1e608e42 | 560 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 561 | { |
562 | Authctxt *authctxt = ctxt; | |
563 | Key *key = NULL; | |
7cac2b65 | 564 | Identity *id = NULL; |
3c0ef626 | 565 | Buffer b; |
1e608e42 | 566 | int pktype, sent = 0; |
567 | u_int alen, blen; | |
568 | char *pkalg, *fp; | |
569 | u_char *pkblob; | |
3c0ef626 | 570 | |
571 | if (authctxt == NULL) | |
572 | fatal("input_userauth_pk_ok: no authentication context"); | |
573 | if (datafellows & SSH_BUG_PKOK) { | |
574 | /* this is similar to SSH_BUG_PKAUTH */ | |
575 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
576 | pkblob = packet_get_string(&blen); | |
577 | buffer_init(&b); | |
578 | buffer_append(&b, pkblob, blen); | |
579 | pkalg = buffer_get_string(&b, &alen); | |
580 | buffer_free(&b); | |
581 | } else { | |
582 | pkalg = packet_get_string(&alen); | |
583 | pkblob = packet_get_string(&blen); | |
584 | } | |
1e608e42 | 585 | packet_check_eom(); |
3c0ef626 | 586 | |
7cac2b65 | 587 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
3c0ef626 | 588 | |
7cac2b65 | 589 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
590 | debug("unknown pkalg %s", pkalg); | |
591 | goto done; | |
592 | } | |
593 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
594 | debug("no key from blob. pkalg %s", pkalg); | |
595 | goto done; | |
596 | } | |
597 | if (key->type != pktype) { | |
598 | error("input_userauth_pk_ok: type mismatch " | |
599 | "for decoded key (received %d, expected %d)", | |
600 | key->type, pktype); | |
601 | goto done; | |
602 | } | |
603 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
604 | debug2("input_userauth_pk_ok: fp %s", fp); | |
605 | xfree(fp); | |
606 | ||
540d72c3 | 607 | /* |
608 | * search keys in the reverse order, because last candidate has been | |
609 | * moved to the end of the queue. this also avoids confusion by | |
610 | * duplicate keys | |
611 | */ | |
7e82606e | 612 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
7cac2b65 | 613 | if (key_equal(key, id->key)) { |
614 | sent = sign_and_send_pubkey(authctxt, id); | |
3c0ef626 | 615 | break; |
616 | } | |
7cac2b65 | 617 | } |
618 | done: | |
3c0ef626 | 619 | if (key != NULL) |
620 | key_free(key); | |
621 | xfree(pkalg); | |
622 | xfree(pkblob); | |
623 | ||
d03f4262 | 624 | /* try another method if we did not send a packet */ |
3c0ef626 | 625 | if (sent == 0) |
626 | userauth(authctxt, NULL); | |
3c0ef626 | 627 | } |
628 | ||
5598e598 | 629 | #ifdef GSSAPI |
540d72c3 | 630 | int |
5598e598 | 631 | userauth_gssapi(Authctxt *authctxt) |
632 | { | |
23987cb8 | 633 | Gssctxt *gssctxt = NULL; |
540d72c3 | 634 | static gss_OID_set gss_supported = NULL; |
2ce0bfe4 | 635 | static u_int mech = 0; |
23987cb8 | 636 | OM_uint32 min; |
7cac2b65 | 637 | int ok = 0; |
fe4ad273 | 638 | char *gss_host = NULL; |
23987cb8 | 639 | |
35094e47 | 640 | if (!options.gss_authentication) { |
641 | verbose("GSSAPI authentication disabled."); | |
642 | return 0; | |
643 | } | |
644 | ||
fe4ad273 | 645 | if (options.gss_trust_dns) |
646 | gss_host = (char *)get_canonical_hostname(1); | |
647 | else | |
648 | gss_host = (char *)authctxt->host; | |
649 | ||
7cac2b65 | 650 | /* Try one GSSAPI method at a time, rather than sending them all at |
651 | * once. */ | |
5598e598 | 652 | |
540d72c3 | 653 | if (gss_supported == NULL) |
654 | gss_indicate_mechs(&min, &gss_supported); | |
b59afbfe | 655 | |
7cac2b65 | 656 | /* Check to see if the mechanism is usable before we offer it */ |
540d72c3 | 657 | while (mech < gss_supported->count && !ok) { |
7cac2b65 | 658 | /* My DER encoding requires length<128 */ |
540d72c3 | 659 | if (gss_supported->elements[mech].length < 128 && |
30460aeb | 660 | ssh_gssapi_check_mechanism(&gssctxt, |
661 | &gss_supported->elements[mech], gss_host)) { | |
7cac2b65 | 662 | ok = 1; /* Mechanism works */ |
23987cb8 | 663 | } else { |
664 | mech++; | |
665 | } | |
5598e598 | 666 | } |
7cac2b65 | 667 | |
2ce0bfe4 | 668 | if (!ok) |
669 | return 0; | |
7cac2b65 | 670 | |
5598e598 | 671 | authctxt->methoddata=(void *)gssctxt; |
7cac2b65 | 672 | |
5598e598 | 673 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
23987cb8 | 674 | packet_put_cstring(authctxt->server_user); |
5598e598 | 675 | packet_put_cstring(authctxt->service); |
7cac2b65 | 676 | packet_put_cstring(authctxt->method->name); |
677 | ||
23987cb8 | 678 | packet_put_int(1); |
5598e598 | 679 | |
dfddba3d | 680 | packet_put_int((gss_supported->elements[mech].length) + 2); |
681 | packet_put_char(SSH_GSS_OIDTYPE); | |
682 | packet_put_char(gss_supported->elements[mech].length); | |
683 | packet_put_raw(gss_supported->elements[mech].elements, | |
684 | gss_supported->elements[mech].length); | |
91a31bec | 685 | |
7cac2b65 | 686 | packet_send(); |
687 | ||
688 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
689 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
690 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
691 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
5598e598 | 692 | |
23987cb8 | 693 | mech++; /* Move along to next candidate */ |
91a31bec | 694 | |
7cac2b65 | 695 | return 1; |
5598e598 | 696 | } |
697 | ||
540d72c3 | 698 | static OM_uint32 |
699 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
700 | { | |
701 | Authctxt *authctxt = ctxt; | |
702 | Gssctxt *gssctxt = authctxt->methoddata; | |
703 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
2ce0bfe4 | 704 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
705 | gss_buffer_desc gssbuf; | |
540d72c3 | 706 | OM_uint32 status, ms, flags; |
707 | Buffer b; | |
708 | ||
709 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
710 | recv_tok, &send_tok, &flags); | |
711 | ||
712 | if (send_tok.length > 0) { | |
713 | if (GSS_ERROR(status)) | |
714 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
715 | else | |
716 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
717 | ||
718 | packet_put_string(send_tok.value, send_tok.length); | |
719 | packet_send(); | |
720 | gss_release_buffer(&ms, &send_tok); | |
721 | } | |
722 | ||
723 | if (status == GSS_S_COMPLETE) { | |
724 | /* send either complete or MIC, depending on mechanism */ | |
51b9ca75 | 725 | if (strcmp(authctxt->method->name,"gssapi")==0 || |
726 | (!(flags & GSS_C_INTEG_FLAG))) { | |
540d72c3 | 727 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); |
728 | packet_send(); | |
729 | } else { | |
730 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
731 | authctxt->service, "gssapi-with-mic"); | |
732 | ||
733 | gssbuf.value = buffer_ptr(&b); | |
734 | gssbuf.length = buffer_len(&b); | |
735 | ||
736 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); | |
737 | ||
738 | if (!GSS_ERROR(status)) { | |
739 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
740 | packet_put_string(mic.value, mic.length); | |
741 | ||
742 | packet_send(); | |
743 | } | |
744 | ||
745 | buffer_free(&b); | |
746 | gss_release_buffer(&ms, &mic); | |
747 | } | |
748 | } | |
749 | ||
750 | return status; | |
751 | } | |
752 | ||
5262cbfb | 753 | /* ARGSUSED */ |
5598e598 | 754 | void |
7cac2b65 | 755 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
5598e598 | 756 | { |
757 | Authctxt *authctxt = ctxt; | |
758 | Gssctxt *gssctxt; | |
f713db99 | 759 | u_int oidlen; |
760 | u_char *oidv; | |
7cac2b65 | 761 | |
5598e598 | 762 | if (authctxt == NULL) |
763 | fatal("input_gssapi_response: no authentication context"); | |
764 | gssctxt = authctxt->methoddata; | |
7cac2b65 | 765 | |
5598e598 | 766 | /* Setup our OID */ |
7cac2b65 | 767 | oidv = packet_get_string(&oidlen); |
768 | ||
dfddba3d | 769 | if (oidlen <= 2 || |
770 | oidv[0] != SSH_GSS_OIDTYPE || | |
771 | oidv[1] != oidlen - 2) { | |
772 | xfree(oidv); | |
773 | debug("Badly encoded mechanism OID received"); | |
774 | userauth(authctxt, NULL); | |
775 | return; | |
23987cb8 | 776 | } |
7cac2b65 | 777 | |
dfddba3d | 778 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
779 | fatal("Server returned different OID than expected"); | |
780 | ||
1e608e42 | 781 | packet_check_eom(); |
7cac2b65 | 782 | |
783 | xfree(oidv); | |
784 | ||
540d72c3 | 785 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
5598e598 | 786 | /* Start again with next method on list */ |
787 | debug("Trying to start again"); | |
7cac2b65 | 788 | userauth(authctxt, NULL); |
5598e598 | 789 | return; |
790 | } | |
5598e598 | 791 | } |
792 | ||
5262cbfb | 793 | /* ARGSUSED */ |
5598e598 | 794 | void |
1e608e42 | 795 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) |
5598e598 | 796 | { |
797 | Authctxt *authctxt = ctxt; | |
7cac2b65 | 798 | gss_buffer_desc recv_tok; |
540d72c3 | 799 | OM_uint32 status; |
007914b3 | 800 | u_int slen; |
7cac2b65 | 801 | |
5598e598 | 802 | if (authctxt == NULL) |
7cac2b65 | 803 | fatal("input_gssapi_response: no authentication context"); |
5598e598 | 804 | |
7cac2b65 | 805 | recv_tok.value = packet_get_string(&slen); |
806 | recv_tok.length = slen; /* safe typecast */ | |
5598e598 | 807 | |
1e608e42 | 808 | packet_check_eom(); |
7cac2b65 | 809 | |
540d72c3 | 810 | status = process_gssapi_token(ctxt, &recv_tok); |
7cac2b65 | 811 | |
812 | xfree(recv_tok.value); | |
813 | ||
5598e598 | 814 | if (GSS_ERROR(status)) { |
815 | /* Start again with the next method in the list */ | |
7cac2b65 | 816 | userauth(authctxt, NULL); |
5598e598 | 817 | return; |
818 | } | |
5598e598 | 819 | } |
820 | ||
5262cbfb | 821 | /* ARGSUSED */ |
e23e524c | 822 | void |
823 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
824 | { | |
825 | Authctxt *authctxt = ctxt; | |
826 | Gssctxt *gssctxt; | |
7cac2b65 | 827 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
828 | gss_buffer_desc recv_tok; | |
829 | OM_uint32 status, ms; | |
830 | u_int len; | |
831 | ||
e23e524c | 832 | if (authctxt == NULL) |
833 | fatal("input_gssapi_response: no authentication context"); | |
834 | gssctxt = authctxt->methoddata; | |
e23e524c | 835 | |
7cac2b65 | 836 | recv_tok.value = packet_get_string(&len); |
837 | recv_tok.length = len; | |
e23e524c | 838 | |
839 | packet_check_eom(); | |
7cac2b65 | 840 | |
841 | /* Stick it into GSSAPI and see what it says */ | |
842 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
2ce0bfe4 | 843 | &recv_tok, &send_tok, NULL); |
7cac2b65 | 844 | |
845 | xfree(recv_tok.value); | |
846 | gss_release_buffer(&ms, &send_tok); | |
847 | ||
848 | /* Server will be returning a failed packet after this one */ | |
e23e524c | 849 | } |
850 | ||
5262cbfb | 851 | /* ARGSUSED */ |
23987cb8 | 852 | void |
853 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
854 | { | |
7cac2b65 | 855 | OM_uint32 maj, min; |
23987cb8 | 856 | char *msg; |
857 | char *lang; | |
7cac2b65 | 858 | |
23987cb8 | 859 | maj=packet_get_int(); |
860 | min=packet_get_int(); | |
861 | msg=packet_get_string(NULL); | |
862 | lang=packet_get_string(NULL); | |
863 | ||
864 | packet_check_eom(); | |
7cac2b65 | 865 | |
08822d99 | 866 | debug("Server GSSAPI Error:\n%s", msg); |
23987cb8 | 867 | xfree(msg); |
868 | xfree(lang); | |
869 | } | |
870 | ||
fe4ad273 | 871 | #ifdef GSI |
872 | extern | |
873 | const gss_OID_desc * const gss_mech_globus_gssapi_openssl; | |
874 | #define is_gsi_oid(oid) \ | |
875 | (oid->length == gss_mech_globus_gssapi_openssl->length && \ | |
876 | (memcmp(oid->elements, gss_mech_globus_gssapi_openssl->elements, \ | |
877 | oid->length) == 0)) | |
878 | #endif | |
879 | ||
5598e598 | 880 | int |
881 | userauth_external(Authctxt *authctxt) | |
882 | { | |
7cac2b65 | 883 | static int attempt = 0; |
5598e598 | 884 | |
885 | if (attempt++ >= 1) | |
886 | return 0; | |
887 | ||
41cbd9f8 | 888 | /* The client MUST NOT try this method if initial key exchange |
889 | was not performed using a GSSAPI-based key exchange | |
890 | method. */ | |
fe4ad273 | 891 | if (gss_kex_context == NULL) { |
41cbd9f8 | 892 | debug2("gsskex not performed, skipping external-keyx"); |
893 | return 0; | |
894 | } | |
895 | ||
5598e598 | 896 | debug2("userauth_external"); |
897 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1baa1dac | 898 | #ifdef GSI |
fe4ad273 | 899 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { |
900 | packet_put_cstring(""); | |
2e9d2d36 | 901 | } else { |
1baa1dac | 902 | #endif |
fe4ad273 | 903 | packet_put_cstring(authctxt->server_user); |
1baa1dac | 904 | #ifdef GSI |
2e9d2d36 | 905 | } |
1baa1dac | 906 | #endif |
5598e598 | 907 | packet_put_cstring(authctxt->service); |
908 | packet_put_cstring(authctxt->method->name); | |
909 | packet_send(); | |
910 | packet_write_wait(); | |
911 | return 1; | |
912 | } | |
fe4ad273 | 913 | int |
914 | userauth_gsskeyex(Authctxt *authctxt) | |
915 | { | |
916 | Buffer b; | |
917 | gss_buffer_desc gssbuf; | |
918 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; | |
919 | OM_uint32 ms; | |
920 | ||
921 | static int attempt = 0; | |
922 | if (attempt++ >= 1) | |
923 | return (0); | |
924 | ||
925 | if (gss_kex_context == NULL) { | |
926 | debug("No valid Key exchange context"); | |
927 | return (0); | |
928 | } | |
929 | ||
930 | #ifdef GSI | |
931 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { | |
932 | ssh_gssapi_buildmic(&b, "", authctxt->service, "gssapi-keyex"); | |
933 | } else { | |
934 | #endif | |
935 | ssh_gssapi_buildmic(&b, authctxt->server_user, authctxt->service, | |
936 | "gssapi-keyex"); | |
937 | #ifdef GSI | |
938 | } | |
939 | #endif | |
940 | ||
941 | gssbuf.value = buffer_ptr(&b); | |
942 | gssbuf.length = buffer_len(&b); | |
943 | ||
944 | if (GSS_ERROR(ssh_gssapi_sign(gss_kex_context, &gssbuf, &mic))) { | |
945 | buffer_free(&b); | |
946 | return (0); | |
947 | } | |
948 | ||
949 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
950 | #ifdef GSI | |
951 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { | |
952 | packet_put_cstring(""); | |
953 | } else { | |
954 | #endif | |
955 | packet_put_cstring(authctxt->server_user); | |
956 | #ifdef GSI | |
957 | } | |
958 | #endif | |
959 | packet_put_cstring(authctxt->service); | |
960 | packet_put_cstring(authctxt->method->name); | |
961 | packet_put_string(mic.value, mic.length); | |
962 | packet_send(); | |
963 | ||
964 | buffer_free(&b); | |
965 | gss_release_buffer(&ms, &mic); | |
966 | ||
967 | return (1); | |
968 | } | |
969 | ||
5598e598 | 970 | #endif /* GSSAPI */ |
971 | ||
3c0ef626 | 972 | int |
973 | userauth_none(Authctxt *authctxt) | |
974 | { | |
975 | /* initial userauth request */ | |
976 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
977 | packet_put_cstring(authctxt->server_user); | |
978 | packet_put_cstring(authctxt->service); | |
979 | packet_put_cstring(authctxt->method->name); | |
980 | packet_send(); | |
981 | return 1; | |
982 | } | |
983 | ||
984 | int | |
985 | userauth_passwd(Authctxt *authctxt) | |
986 | { | |
987 | static int attempt = 0; | |
510132b6 | 988 | char prompt[150]; |
3c0ef626 | 989 | char *password; |
990 | ||
991 | if (attempt++ >= options.number_of_password_prompts) | |
992 | return 0; | |
993 | ||
1e608e42 | 994 | if (attempt != 1) |
3c0ef626 | 995 | error("Permission denied, please try again."); |
996 | ||
997 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", | |
998 | authctxt->server_user, authctxt->host); | |
999 | password = read_passphrase(prompt, 0); | |
1000 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1001 | packet_put_cstring(authctxt->server_user); | |
1002 | packet_put_cstring(authctxt->service); | |
1003 | packet_put_cstring(authctxt->method->name); | |
1004 | packet_put_char(0); | |
1005 | packet_put_cstring(password); | |
1006 | memset(password, 0, strlen(password)); | |
1007 | xfree(password); | |
1008 | packet_add_padding(64); | |
1009 | packet_send(); | |
510132b6 | 1010 | |
44a053a3 | 1011 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
510132b6 | 1012 | &input_userauth_passwd_changereq); |
1013 | ||
3c0ef626 | 1014 | return 1; |
1015 | } | |
5262cbfb | 1016 | |
510132b6 | 1017 | /* |
1018 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
1019 | */ | |
5262cbfb | 1020 | /* ARGSUSED */ |
510132b6 | 1021 | void |
1022 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) | |
1023 | { | |
1024 | Authctxt *authctxt = ctxt; | |
1025 | char *info, *lang, *password = NULL, *retype = NULL; | |
1026 | char prompt[150]; | |
1027 | ||
1028 | debug2("input_userauth_passwd_changereq"); | |
1029 | ||
1030 | if (authctxt == NULL) | |
1031 | fatal("input_userauth_passwd_changereq: " | |
1032 | "no authentication context"); | |
1033 | ||
1034 | info = packet_get_string(NULL); | |
1035 | lang = packet_get_string(NULL); | |
1036 | if (strlen(info) > 0) | |
7cac2b65 | 1037 | logit("%s", info); |
510132b6 | 1038 | xfree(info); |
1039 | xfree(lang); | |
1040 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1041 | packet_put_cstring(authctxt->server_user); | |
1042 | packet_put_cstring(authctxt->service); | |
1043 | packet_put_cstring(authctxt->method->name); | |
1044 | packet_put_char(1); /* additional info */ | |
44a053a3 | 1045 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1046 | "Enter %.30s@%.128s's old password: ", |
1047 | authctxt->server_user, authctxt->host); | |
1048 | password = read_passphrase(prompt, 0); | |
1049 | packet_put_cstring(password); | |
1050 | memset(password, 0, strlen(password)); | |
1051 | xfree(password); | |
1052 | password = NULL; | |
1053 | while (password == NULL) { | |
44a053a3 | 1054 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1055 | "Enter %.30s@%.128s's new password: ", |
1056 | authctxt->server_user, authctxt->host); | |
1057 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
1058 | if (password == NULL) { | |
1059 | /* bail out */ | |
1060 | return; | |
1061 | } | |
44a053a3 | 1062 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1063 | "Retype %.30s@%.128s's new password: ", |
1064 | authctxt->server_user, authctxt->host); | |
1065 | retype = read_passphrase(prompt, 0); | |
1066 | if (strcmp(password, retype) != 0) { | |
1067 | memset(password, 0, strlen(password)); | |
1068 | xfree(password); | |
7cac2b65 | 1069 | logit("Mismatch; try again, EOF to quit."); |
510132b6 | 1070 | password = NULL; |
1071 | } | |
1072 | memset(retype, 0, strlen(retype)); | |
1073 | xfree(retype); | |
1074 | } | |
1075 | packet_put_cstring(password); | |
1076 | memset(password, 0, strlen(password)); | |
1077 | xfree(password); | |
1078 | packet_add_padding(64); | |
1079 | packet_send(); | |
44a053a3 | 1080 | |
1081 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
510132b6 | 1082 | &input_userauth_passwd_changereq); |
1083 | } | |
3c0ef626 | 1084 | |
5262cbfb | 1085 | #ifdef JPAKE |
1086 | static char * | |
1087 | pw_encrypt(const char *password, const char *crypt_scheme, const char *salt) | |
1088 | { | |
1089 | /* OpenBSD crypt(3) handles all of these */ | |
1090 | if (strcmp(crypt_scheme, "crypt") == 0 || | |
1091 | strcmp(crypt_scheme, "bcrypt") == 0 || | |
1092 | strcmp(crypt_scheme, "md5crypt") == 0 || | |
1093 | strcmp(crypt_scheme, "crypt-extended") == 0) | |
1094 | return xstrdup(crypt(password, salt)); | |
1095 | error("%s: unsupported password encryption scheme \"%.100s\"", | |
1096 | __func__, crypt_scheme); | |
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | static BIGNUM * | |
1101 | jpake_password_to_secret(Authctxt *authctxt, const char *crypt_scheme, | |
1102 | const char *salt) | |
1103 | { | |
1104 | char prompt[256], *password, *crypted; | |
1105 | u_char *secret; | |
1106 | u_int secret_len; | |
1107 | BIGNUM *ret; | |
1108 | ||
1109 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password (JPAKE): ", | |
1110 | authctxt->server_user, authctxt->host); | |
1111 | password = read_passphrase(prompt, 0); | |
1112 | ||
1113 | if ((crypted = pw_encrypt(password, crypt_scheme, salt)) == NULL) { | |
1114 | logit("Disabling %s authentication", authctxt->method->name); | |
1115 | authctxt->method->enabled = NULL; | |
1116 | /* Continue with an empty password to fail gracefully */ | |
1117 | crypted = xstrdup(""); | |
1118 | } | |
1119 | ||
1120 | #ifdef JPAKE_DEBUG | |
1121 | debug3("%s: salt = %s", __func__, salt); | |
1122 | debug3("%s: scheme = %s", __func__, crypt_scheme); | |
1123 | debug3("%s: crypted = %s", __func__, crypted); | |
1124 | #endif | |
1125 | ||
1126 | if (hash_buffer(crypted, strlen(crypted), EVP_sha256(), | |
1127 | &secret, &secret_len) != 0) | |
1128 | fatal("%s: hash_buffer", __func__); | |
1129 | ||
1130 | bzero(password, strlen(password)); | |
1131 | bzero(crypted, strlen(crypted)); | |
1132 | xfree(password); | |
1133 | xfree(crypted); | |
1134 | ||
1135 | if ((ret = BN_bin2bn(secret, secret_len, NULL)) == NULL) | |
1136 | fatal("%s: BN_bin2bn (secret)", __func__); | |
1137 | bzero(secret, secret_len); | |
1138 | xfree(secret); | |
1139 | ||
1140 | return ret; | |
1141 | } | |
1142 | ||
1143 | /* ARGSUSED */ | |
1144 | void | |
1145 | input_userauth_jpake_server_step1(int type, u_int32_t seq, void *ctxt) | |
1146 | { | |
1147 | Authctxt *authctxt = ctxt; | |
1148 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1149 | u_char *x3_proof, *x4_proof, *x2_s_proof; | |
1150 | u_int x3_proof_len, x4_proof_len, x2_s_proof_len; | |
1151 | char *crypt_scheme, *salt; | |
1152 | ||
1153 | /* Disable this message */ | |
1154 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, NULL); | |
1155 | ||
1156 | if ((pctx->g_x3 = BN_new()) == NULL || | |
1157 | (pctx->g_x4 = BN_new()) == NULL) | |
1158 | fatal("%s: BN_new", __func__); | |
1159 | ||
1160 | /* Fetch step 1 values */ | |
1161 | crypt_scheme = packet_get_string(NULL); | |
1162 | salt = packet_get_string(NULL); | |
1163 | pctx->server_id = packet_get_string(&pctx->server_id_len); | |
1164 | packet_get_bignum2(pctx->g_x3); | |
1165 | packet_get_bignum2(pctx->g_x4); | |
1166 | x3_proof = packet_get_string(&x3_proof_len); | |
1167 | x4_proof = packet_get_string(&x4_proof_len); | |
1168 | packet_check_eom(); | |
1169 | ||
1170 | JPAKE_DEBUG_CTX((pctx, "step 1 received in %s", __func__)); | |
1171 | ||
1172 | /* Obtain password and derive secret */ | |
1173 | pctx->s = jpake_password_to_secret(authctxt, crypt_scheme, salt); | |
1174 | bzero(crypt_scheme, strlen(crypt_scheme)); | |
1175 | bzero(salt, strlen(salt)); | |
1176 | xfree(crypt_scheme); | |
1177 | xfree(salt); | |
1178 | JPAKE_DEBUG_BN((pctx->s, "%s: s = ", __func__)); | |
1179 | ||
1180 | /* Calculate step 2 values */ | |
1181 | jpake_step2(pctx->grp, pctx->s, pctx->g_x1, | |
1182 | pctx->g_x3, pctx->g_x4, pctx->x2, | |
1183 | pctx->server_id, pctx->server_id_len, | |
1184 | pctx->client_id, pctx->client_id_len, | |
1185 | x3_proof, x3_proof_len, | |
1186 | x4_proof, x4_proof_len, | |
1187 | &pctx->a, | |
1188 | &x2_s_proof, &x2_s_proof_len); | |
1189 | ||
1190 | bzero(x3_proof, x3_proof_len); | |
1191 | bzero(x4_proof, x4_proof_len); | |
1192 | xfree(x3_proof); | |
1193 | xfree(x4_proof); | |
1194 | ||
1195 | JPAKE_DEBUG_CTX((pctx, "step 2 sending in %s", __func__)); | |
1196 | ||
1197 | /* Send values for step 2 */ | |
1198 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP2); | |
1199 | packet_put_bignum2(pctx->a); | |
1200 | packet_put_string(x2_s_proof, x2_s_proof_len); | |
1201 | packet_send(); | |
1202 | ||
1203 | bzero(x2_s_proof, x2_s_proof_len); | |
1204 | xfree(x2_s_proof); | |
1205 | ||
1206 | /* Expect step 2 packet from peer */ | |
1207 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, | |
1208 | input_userauth_jpake_server_step2); | |
1209 | } | |
1210 | ||
1211 | /* ARGSUSED */ | |
1212 | void | |
1213 | input_userauth_jpake_server_step2(int type, u_int32_t seq, void *ctxt) | |
1214 | { | |
1215 | Authctxt *authctxt = ctxt; | |
1216 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1217 | u_char *x4_s_proof; | |
1218 | u_int x4_s_proof_len; | |
1219 | ||
1220 | /* Disable this message */ | |
1221 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, NULL); | |
1222 | ||
1223 | if ((pctx->b = BN_new()) == NULL) | |
1224 | fatal("%s: BN_new", __func__); | |
1225 | ||
1226 | /* Fetch step 2 values */ | |
1227 | packet_get_bignum2(pctx->b); | |
1228 | x4_s_proof = packet_get_string(&x4_s_proof_len); | |
1229 | packet_check_eom(); | |
1230 | ||
1231 | JPAKE_DEBUG_CTX((pctx, "step 2 received in %s", __func__)); | |
1232 | ||
1233 | /* Derive shared key and calculate confirmation hash */ | |
1234 | jpake_key_confirm(pctx->grp, pctx->s, pctx->b, | |
1235 | pctx->x2, pctx->g_x1, pctx->g_x2, pctx->g_x3, pctx->g_x4, | |
1236 | pctx->client_id, pctx->client_id_len, | |
1237 | pctx->server_id, pctx->server_id_len, | |
1238 | session_id2, session_id2_len, | |
1239 | x4_s_proof, x4_s_proof_len, | |
1240 | &pctx->k, | |
1241 | &pctx->h_k_cid_sessid, &pctx->h_k_cid_sessid_len); | |
1242 | ||
1243 | bzero(x4_s_proof, x4_s_proof_len); | |
1244 | xfree(x4_s_proof); | |
1245 | ||
1246 | JPAKE_DEBUG_CTX((pctx, "confirm sending in %s", __func__)); | |
1247 | ||
1248 | /* Send key confirmation proof */ | |
1249 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_CONFIRM); | |
1250 | packet_put_string(pctx->h_k_cid_sessid, pctx->h_k_cid_sessid_len); | |
1251 | packet_send(); | |
1252 | ||
1253 | /* Expect confirmation from peer */ | |
1254 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, | |
1255 | input_userauth_jpake_server_confirm); | |
1256 | } | |
1257 | ||
1258 | /* ARGSUSED */ | |
1259 | void | |
1260 | input_userauth_jpake_server_confirm(int type, u_int32_t seq, void *ctxt) | |
1261 | { | |
1262 | Authctxt *authctxt = ctxt; | |
1263 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1264 | ||
1265 | /* Disable this message */ | |
1266 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, NULL); | |
1267 | ||
1268 | pctx->h_k_sid_sessid = packet_get_string(&pctx->h_k_sid_sessid_len); | |
1269 | packet_check_eom(); | |
1270 | ||
1271 | JPAKE_DEBUG_CTX((pctx, "confirm received in %s", __func__)); | |
1272 | ||
1273 | /* Verify expected confirmation hash */ | |
1274 | if (jpake_check_confirm(pctx->k, | |
1275 | pctx->server_id, pctx->server_id_len, | |
1276 | session_id2, session_id2_len, | |
1277 | pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len) == 1) | |
1278 | debug("%s: %s success", __func__, authctxt->method->name); | |
1279 | else { | |
1280 | debug("%s: confirmation mismatch", __func__); | |
1281 | /* XXX stash this so if auth succeeds then we can warn/kill */ | |
1282 | } | |
1283 | ||
1284 | userauth_jpake_cleanup(authctxt); | |
1285 | } | |
1286 | #endif /* JPAKE */ | |
1287 | ||
7cac2b65 | 1288 | static int |
1289 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
1290 | u_char *data, u_int datalen) | |
3c0ef626 | 1291 | { |
7cac2b65 | 1292 | Key *prv; |
1293 | int ret; | |
1294 | ||
1295 | /* the agent supports this key */ | |
1296 | if (id->ac) | |
1297 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
1298 | data, datalen)); | |
1299 | /* | |
1300 | * we have already loaded the private key or | |
1301 | * the private key is stored in external hardware | |
1302 | */ | |
1303 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
1304 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
1305 | /* load the private key from the file */ | |
1306 | if ((prv = load_identity_file(id->filename)) == NULL) | |
1307 | return (-1); | |
1308 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
1309 | key_free(prv); | |
1310 | return (ret); | |
3c0ef626 | 1311 | } |
1312 | ||
1313 | static int | |
7cac2b65 | 1314 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1315 | { |
1316 | Buffer b; | |
1317 | u_char *blob, *signature; | |
1e608e42 | 1318 | u_int bloblen, slen; |
7cac2b65 | 1319 | u_int skip = 0; |
3c0ef626 | 1320 | int ret = -1; |
1321 | int have_sig = 1; | |
1322 | ||
1323 | debug3("sign_and_send_pubkey"); | |
1324 | ||
7cac2b65 | 1325 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1326 | /* we cannot handle this key */ |
1327 | debug3("sign_and_send_pubkey: cannot handle key"); | |
1328 | return 0; | |
1329 | } | |
1330 | /* data to be signed */ | |
1331 | buffer_init(&b); | |
1332 | if (datafellows & SSH_OLD_SESSIONID) { | |
1333 | buffer_append(&b, session_id2, session_id2_len); | |
1334 | skip = session_id2_len; | |
1335 | } else { | |
1336 | buffer_put_string(&b, session_id2, session_id2_len); | |
1337 | skip = buffer_len(&b); | |
1338 | } | |
1339 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1340 | buffer_put_cstring(&b, authctxt->server_user); | |
1341 | buffer_put_cstring(&b, | |
1342 | datafellows & SSH_BUG_PKSERVICE ? | |
1343 | "ssh-userauth" : | |
1344 | authctxt->service); | |
1345 | if (datafellows & SSH_BUG_PKAUTH) { | |
1346 | buffer_put_char(&b, have_sig); | |
1347 | } else { | |
1348 | buffer_put_cstring(&b, authctxt->method->name); | |
1349 | buffer_put_char(&b, have_sig); | |
7cac2b65 | 1350 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 1351 | } |
1352 | buffer_put_string(&b, blob, bloblen); | |
1353 | ||
1354 | /* generate signature */ | |
7cac2b65 | 1355 | ret = identity_sign(id, &signature, &slen, |
3c0ef626 | 1356 | buffer_ptr(&b), buffer_len(&b)); |
1357 | if (ret == -1) { | |
1358 | xfree(blob); | |
1359 | buffer_free(&b); | |
1360 | return 0; | |
1361 | } | |
1362 | #ifdef DEBUG_PK | |
1363 | buffer_dump(&b); | |
1364 | #endif | |
1365 | if (datafellows & SSH_BUG_PKSERVICE) { | |
1366 | buffer_clear(&b); | |
1367 | buffer_append(&b, session_id2, session_id2_len); | |
1368 | skip = session_id2_len; | |
1369 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1370 | buffer_put_cstring(&b, authctxt->server_user); | |
1371 | buffer_put_cstring(&b, authctxt->service); | |
1372 | buffer_put_cstring(&b, authctxt->method->name); | |
1373 | buffer_put_char(&b, have_sig); | |
1374 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 1375 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 1376 | buffer_put_string(&b, blob, bloblen); |
1377 | } | |
1378 | xfree(blob); | |
1379 | ||
1380 | /* append signature */ | |
1381 | buffer_put_string(&b, signature, slen); | |
1382 | xfree(signature); | |
1383 | ||
1384 | /* skip session id and packet type */ | |
1385 | if (buffer_len(&b) < skip + 1) | |
1386 | fatal("userauth_pubkey: internal error"); | |
1387 | buffer_consume(&b, skip + 1); | |
1388 | ||
1389 | /* put remaining data from buffer into packet */ | |
1390 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1391 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
1392 | buffer_free(&b); | |
1393 | packet_send(); | |
1394 | ||
1395 | return 1; | |
1396 | } | |
1397 | ||
1398 | static int | |
7cac2b65 | 1399 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1400 | { |
1401 | u_char *blob; | |
1e608e42 | 1402 | u_int bloblen, have_sig = 0; |
3c0ef626 | 1403 | |
1404 | debug3("send_pubkey_test"); | |
1405 | ||
7cac2b65 | 1406 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1407 | /* we cannot handle this key */ |
1408 | debug3("send_pubkey_test: cannot handle key"); | |
1409 | return 0; | |
1410 | } | |
1411 | /* register callback for USERAUTH_PK_OK message */ | |
3c0ef626 | 1412 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
1413 | ||
1414 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1415 | packet_put_cstring(authctxt->server_user); | |
1416 | packet_put_cstring(authctxt->service); | |
1417 | packet_put_cstring(authctxt->method->name); | |
1418 | packet_put_char(have_sig); | |
1419 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 1420 | packet_put_cstring(key_ssh_name(id->key)); |
3c0ef626 | 1421 | packet_put_string(blob, bloblen); |
1422 | xfree(blob); | |
1423 | packet_send(); | |
1424 | return 1; | |
1425 | } | |
1426 | ||
1427 | static Key * | |
1428 | load_identity_file(char *filename) | |
1429 | { | |
1430 | Key *private; | |
1431 | char prompt[300], *passphrase; | |
30460aeb | 1432 | int perm_ok, quit, i; |
3c0ef626 | 1433 | struct stat st; |
1434 | ||
1435 | if (stat(filename, &st) < 0) { | |
1436 | debug3("no such identity: %s", filename); | |
1437 | return NULL; | |
1438 | } | |
30460aeb | 1439 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
1440 | if (!perm_ok) | |
1441 | return NULL; | |
3c0ef626 | 1442 | if (private == NULL) { |
1443 | if (options.batch_mode) | |
1444 | return NULL; | |
1445 | snprintf(prompt, sizeof prompt, | |
1e608e42 | 1446 | "Enter passphrase for key '%.100s': ", filename); |
3c0ef626 | 1447 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1448 | passphrase = read_passphrase(prompt, 0); | |
1449 | if (strcmp(passphrase, "") != 0) { | |
30460aeb | 1450 | private = key_load_private_type(KEY_UNSPEC, |
1451 | filename, passphrase, NULL, NULL); | |
3c0ef626 | 1452 | quit = 0; |
1453 | } else { | |
1454 | debug2("no passphrase given, try next key"); | |
1455 | quit = 1; | |
1456 | } | |
1457 | memset(passphrase, 0, strlen(passphrase)); | |
1458 | xfree(passphrase); | |
1459 | if (private != NULL || quit) | |
1460 | break; | |
1461 | debug2("bad passphrase given, try again..."); | |
1462 | } | |
1463 | } | |
1464 | return private; | |
1465 | } | |
1466 | ||
7cac2b65 | 1467 | /* |
1468 | * try keys in the following order: | |
1469 | * 1. agent keys that are found in the config file | |
1470 | * 2. other agent keys | |
1471 | * 3. keys that are only listed in the config file | |
1472 | */ | |
1473 | static void | |
1474 | pubkey_prepare(Authctxt *authctxt) | |
3c0ef626 | 1475 | { |
7cac2b65 | 1476 | Identity *id; |
1477 | Idlist agent, files, *preferred; | |
1478 | Key *key; | |
1479 | AuthenticationConnection *ac; | |
1480 | char *comment; | |
1481 | int i, found; | |
1482 | ||
1483 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1484 | TAILQ_INIT(&files); /* keys from the config file */ | |
1485 | preferred = &authctxt->keys; | |
1486 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1487 | ||
1488 | /* list of keys stored in the filesystem */ | |
1489 | for (i = 0; i < options.num_identity_files; i++) { | |
1490 | key = options.identity_keys[i]; | |
1491 | if (key && key->type == KEY_RSA1) | |
1492 | continue; | |
1493 | options.identity_keys[i] = NULL; | |
30460aeb | 1494 | id = xcalloc(1, sizeof(*id)); |
7cac2b65 | 1495 | id->key = key; |
1496 | id->filename = xstrdup(options.identity_files[i]); | |
1497 | TAILQ_INSERT_TAIL(&files, id, next); | |
1498 | } | |
1499 | /* list of keys supported by the agent */ | |
1500 | if ((ac = ssh_get_authentication_connection())) { | |
1501 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1502 | key != NULL; | |
1503 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1504 | found = 0; | |
1505 | TAILQ_FOREACH(id, &files, next) { | |
540d72c3 | 1506 | /* agent keys from the config file are preferred */ |
7cac2b65 | 1507 | if (key_equal(key, id->key)) { |
1508 | key_free(key); | |
1509 | xfree(comment); | |
1510 | TAILQ_REMOVE(&files, id, next); | |
1511 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1512 | id->ac = ac; | |
1513 | found = 1; | |
1514 | break; | |
1515 | } | |
1516 | } | |
12a403af | 1517 | if (!found && !options.identities_only) { |
30460aeb | 1518 | id = xcalloc(1, sizeof(*id)); |
7cac2b65 | 1519 | id->key = key; |
1520 | id->filename = comment; | |
1521 | id->ac = ac; | |
1522 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1523 | } | |
1524 | } | |
1525 | /* append remaining agent keys */ | |
1526 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1527 | TAILQ_REMOVE(&agent, id, next); | |
1528 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1529 | } | |
1530 | authctxt->agent = ac; | |
1531 | } | |
1532 | /* append remaining keys from the config file */ | |
1533 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1534 | TAILQ_REMOVE(&files, id, next); | |
1535 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1536 | } | |
1537 | TAILQ_FOREACH(id, preferred, next) { | |
1538 | debug2("key: %s (%p)", id->filename, id->key); | |
1539 | } | |
3c0ef626 | 1540 | } |
1541 | ||
7cac2b65 | 1542 | static void |
1543 | pubkey_cleanup(Authctxt *authctxt) | |
3c0ef626 | 1544 | { |
7cac2b65 | 1545 | Identity *id; |
1546 | ||
1547 | if (authctxt->agent != NULL) | |
1548 | ssh_close_authentication_connection(authctxt->agent); | |
1549 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1550 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1551 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1552 | if (id->key) | |
1553 | key_free(id->key); | |
1554 | if (id->filename) | |
1555 | xfree(id->filename); | |
1556 | xfree(id); | |
3c0ef626 | 1557 | } |
3c0ef626 | 1558 | } |
1559 | ||
1560 | int | |
1561 | userauth_pubkey(Authctxt *authctxt) | |
1562 | { | |
7cac2b65 | 1563 | Identity *id; |
3c0ef626 | 1564 | int sent = 0; |
3c0ef626 | 1565 | |
7cac2b65 | 1566 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1567 | if (id->tried++) | |
1568 | return (0); | |
540d72c3 | 1569 | /* move key to the end of the queue */ |
7cac2b65 | 1570 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1571 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1572 | /* | |
1573 | * send a test message if we have the public key. for | |
1574 | * encrypted keys we cannot do this and have to load the | |
1575 | * private key instead | |
1576 | */ | |
1577 | if (id->key && id->key->type != KEY_RSA1) { | |
1578 | debug("Offering public key: %s", id->filename); | |
1579 | sent = send_pubkey_test(authctxt, id); | |
1580 | } else if (id->key == NULL) { | |
1581 | debug("Trying private key: %s", id->filename); | |
1582 | id->key = load_identity_file(id->filename); | |
1583 | if (id->key != NULL) { | |
1584 | id->isprivate = 1; | |
1585 | sent = sign_and_send_pubkey(authctxt, id); | |
1586 | key_free(id->key); | |
1587 | id->key = NULL; | |
3c0ef626 | 1588 | } |
3c0ef626 | 1589 | } |
7cac2b65 | 1590 | if (sent) |
1591 | return (sent); | |
3c0ef626 | 1592 | } |
7cac2b65 | 1593 | return (0); |
3c0ef626 | 1594 | } |
1595 | ||
1596 | /* | |
1597 | * Send userauth request message specifying keyboard-interactive method. | |
1598 | */ | |
1599 | int | |
1600 | userauth_kbdint(Authctxt *authctxt) | |
1601 | { | |
1602 | static int attempt = 0; | |
1603 | ||
1604 | if (attempt++ >= options.number_of_password_prompts) | |
1605 | return 0; | |
1606 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ | |
1607 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1608 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1609 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | debug2("userauth_kbdint"); | |
1614 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1615 | packet_put_cstring(authctxt->server_user); | |
1616 | packet_put_cstring(authctxt->service); | |
1617 | packet_put_cstring(authctxt->method->name); | |
1618 | packet_put_cstring(""); /* lang */ | |
1619 | packet_put_cstring(options.kbd_interactive_devices ? | |
1620 | options.kbd_interactive_devices : ""); | |
1621 | packet_send(); | |
1622 | ||
1623 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1624 | return 1; | |
1625 | } | |
1626 | ||
1627 | /* | |
1628 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE | |
1629 | */ | |
1630 | void | |
1e608e42 | 1631 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1632 | { |
1633 | Authctxt *authctxt = ctxt; | |
1634 | char *name, *inst, *lang, *prompt, *response; | |
1635 | u_int num_prompts, i; | |
1636 | int echo = 0; | |
1637 | ||
1638 | debug2("input_userauth_info_req"); | |
1639 | ||
1640 | if (authctxt == NULL) | |
1641 | fatal("input_userauth_info_req: no authentication context"); | |
1642 | ||
1643 | authctxt->info_req_seen = 1; | |
1644 | ||
1645 | name = packet_get_string(NULL); | |
1646 | inst = packet_get_string(NULL); | |
1647 | lang = packet_get_string(NULL); | |
1648 | if (strlen(name) > 0) | |
7cac2b65 | 1649 | logit("%s", name); |
3c0ef626 | 1650 | if (strlen(inst) > 0) |
7cac2b65 | 1651 | logit("%s", inst); |
3c0ef626 | 1652 | xfree(name); |
1653 | xfree(inst); | |
1654 | xfree(lang); | |
1655 | ||
1656 | num_prompts = packet_get_int(); | |
1657 | /* | |
1658 | * Begin to build info response packet based on prompts requested. | |
1659 | * We commit to providing the correct number of responses, so if | |
1660 | * further on we run into a problem that prevents this, we have to | |
1661 | * be sure and clean this up and send a correct error response. | |
1662 | */ | |
1663 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1664 | packet_put_int(num_prompts); | |
1665 | ||
1666 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); | |
1667 | for (i = 0; i < num_prompts; i++) { | |
1668 | prompt = packet_get_string(NULL); | |
1669 | echo = packet_get_char(); | |
1670 | ||
1671 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); | |
1672 | ||
1673 | packet_put_cstring(response); | |
1674 | memset(response, 0, strlen(response)); | |
1675 | xfree(response); | |
1676 | xfree(prompt); | |
1677 | } | |
1e608e42 | 1678 | packet_check_eom(); /* done with parsing incoming message. */ |
3c0ef626 | 1679 | |
1680 | packet_add_padding(64); | |
1681 | packet_send(); | |
1682 | } | |
1683 | ||
44a053a3 | 1684 | static int |
276b07a3 | 1685 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
44a053a3 | 1686 | u_char *data, u_int datalen) |
1687 | { | |
1688 | Buffer b; | |
1689 | struct stat st; | |
1690 | pid_t pid; | |
1691 | int to[2], from[2], status, version = 2; | |
1692 | ||
bfe49944 | 1693 | debug2("ssh_keysign called"); |
44a053a3 | 1694 | |
1695 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { | |
1696 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1697 | return -1; | |
1698 | } | |
1699 | if (fflush(stdout) != 0) | |
1700 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1701 | if (pipe(to) < 0) { | |
1702 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1703 | return -1; | |
1704 | } | |
1705 | if (pipe(from) < 0) { | |
1706 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1707 | return -1; | |
1708 | } | |
1709 | if ((pid = fork()) < 0) { | |
1710 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1711 | return -1; | |
1712 | } | |
1713 | if (pid == 0) { | |
30460aeb | 1714 | permanently_drop_suid(getuid()); |
44a053a3 | 1715 | close(from[0]); |
1716 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1717 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1718 | close(to[1]); | |
1719 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1720 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1721 | close(from[1]); | |
1722 | close(to[0]); | |
1723 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); | |
1724 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, | |
1725 | strerror(errno)); | |
1726 | } | |
1727 | close(from[1]); | |
1728 | close(to[0]); | |
1729 | ||
1730 | buffer_init(&b); | |
1731 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ | |
1732 | buffer_put_string(&b, data, datalen); | |
540d72c3 | 1733 | if (ssh_msg_send(to[1], version, &b) == -1) |
1734 | fatal("ssh_keysign: couldn't send request"); | |
44a053a3 | 1735 | |
d03f4262 | 1736 | if (ssh_msg_recv(from[0], &b) < 0) { |
44a053a3 | 1737 | error("ssh_keysign: no reply"); |
540d72c3 | 1738 | buffer_free(&b); |
44a053a3 | 1739 | return -1; |
1740 | } | |
1741 | close(from[0]); | |
1742 | close(to[1]); | |
1743 | ||
1744 | while (waitpid(pid, &status, 0) < 0) | |
1745 | if (errno != EINTR) | |
1746 | break; | |
1747 | ||
1748 | if (buffer_get_char(&b) != version) { | |
1749 | error("ssh_keysign: bad version"); | |
540d72c3 | 1750 | buffer_free(&b); |
44a053a3 | 1751 | return -1; |
1752 | } | |
1753 | *sigp = buffer_get_string(&b, lenp); | |
540d72c3 | 1754 | buffer_free(&b); |
44a053a3 | 1755 | |
1756 | return 0; | |
1757 | } | |
1758 | ||
3c0ef626 | 1759 | int |
1760 | userauth_hostbased(Authctxt *authctxt) | |
1761 | { | |
1762 | Key *private = NULL; | |
44a053a3 | 1763 | Sensitive *sensitive = authctxt->sensitive; |
3c0ef626 | 1764 | Buffer b; |
1765 | u_char *signature, *blob; | |
fa0f0f45 | 1766 | char *chost, *pkalg, *p, myname[NI_MAXHOST]; |
3c0ef626 | 1767 | const char *service; |
1768 | u_int blen, slen; | |
1769 | int ok, i, len, found = 0; | |
1770 | ||
1771 | /* check for a useful key */ | |
44a053a3 | 1772 | for (i = 0; i < sensitive->nkeys; i++) { |
1773 | private = sensitive->keys[i]; | |
3c0ef626 | 1774 | if (private && private->type != KEY_RSA1) { |
1775 | found = 1; | |
1776 | /* we take and free the key */ | |
44a053a3 | 1777 | sensitive->keys[i] = NULL; |
3c0ef626 | 1778 | break; |
1779 | } | |
1780 | } | |
1781 | if (!found) { | |
bfe49944 | 1782 | debug("No more client hostkeys for hostbased authentication."); |
3c0ef626 | 1783 | return 0; |
1784 | } | |
1785 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1786 | key_free(private); | |
1787 | return 0; | |
1788 | } | |
1789 | /* figure out a name for the client host */ | |
fa0f0f45 | 1790 | p = NULL; |
1791 | if (packet_connection_is_on_socket()) | |
1792 | p = get_local_name(packet_get_connection_in()); | |
1793 | if (p == NULL) { | |
1794 | if (gethostname(myname, sizeof(myname)) == -1) { | |
1795 | verbose("userauth_hostbased: gethostname: %s", | |
1796 | strerror(errno)); | |
1797 | } else | |
1798 | p = xstrdup(myname); | |
1799 | } | |
3c0ef626 | 1800 | if (p == NULL) { |
1801 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1802 | key_free(private); | |
30460aeb | 1803 | xfree(blob); |
3c0ef626 | 1804 | return 0; |
1805 | } | |
1806 | len = strlen(p) + 2; | |
30460aeb | 1807 | xasprintf(&chost, "%s.", p); |
3c0ef626 | 1808 | debug2("userauth_hostbased: chost %s", chost); |
bfe49944 | 1809 | xfree(p); |
3c0ef626 | 1810 | |
1811 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : | |
1812 | authctxt->service; | |
1813 | pkalg = xstrdup(key_ssh_name(private)); | |
1814 | buffer_init(&b); | |
1815 | /* construct data */ | |
1816 | buffer_put_string(&b, session_id2, session_id2_len); | |
1817 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1818 | buffer_put_cstring(&b, authctxt->server_user); | |
1819 | buffer_put_cstring(&b, service); | |
1820 | buffer_put_cstring(&b, authctxt->method->name); | |
1821 | buffer_put_cstring(&b, pkalg); | |
1822 | buffer_put_string(&b, blob, blen); | |
1823 | buffer_put_cstring(&b, chost); | |
1824 | buffer_put_cstring(&b, authctxt->local_user); | |
1825 | #ifdef DEBUG_PK | |
1826 | buffer_dump(&b); | |
1827 | #endif | |
44a053a3 | 1828 | if (sensitive->external_keysign) |
1829 | ok = ssh_keysign(private, &signature, &slen, | |
1830 | buffer_ptr(&b), buffer_len(&b)); | |
1831 | else | |
1832 | ok = key_sign(private, &signature, &slen, | |
1833 | buffer_ptr(&b), buffer_len(&b)); | |
3c0ef626 | 1834 | key_free(private); |
1835 | buffer_free(&b); | |
1836 | if (ok != 0) { | |
1837 | error("key_sign failed"); | |
1838 | xfree(chost); | |
1839 | xfree(pkalg); | |
30460aeb | 1840 | xfree(blob); |
3c0ef626 | 1841 | return 0; |
1842 | } | |
1843 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1844 | packet_put_cstring(authctxt->server_user); | |
1845 | packet_put_cstring(authctxt->service); | |
1846 | packet_put_cstring(authctxt->method->name); | |
1847 | packet_put_cstring(pkalg); | |
1848 | packet_put_string(blob, blen); | |
1849 | packet_put_cstring(chost); | |
1850 | packet_put_cstring(authctxt->local_user); | |
1851 | packet_put_string(signature, slen); | |
1852 | memset(signature, 's', slen); | |
1853 | xfree(signature); | |
1854 | xfree(chost); | |
1855 | xfree(pkalg); | |
30460aeb | 1856 | xfree(blob); |
3c0ef626 | 1857 | |
1858 | packet_send(); | |
1859 | return 1; | |
1860 | } | |
1861 | ||
5262cbfb | 1862 | #ifdef JPAKE |
1863 | int | |
1864 | userauth_jpake(Authctxt *authctxt) | |
1865 | { | |
1866 | struct jpake_ctx *pctx; | |
1867 | u_char *x1_proof, *x2_proof; | |
1868 | u_int x1_proof_len, x2_proof_len; | |
1869 | static int attempt = 0; /* XXX share with userauth_password's? */ | |
1870 | ||
1871 | if (attempt++ >= options.number_of_password_prompts) | |
1872 | return 0; | |
1873 | if (attempt != 1) | |
1874 | error("Permission denied, please try again."); | |
1875 | ||
1876 | if (authctxt->methoddata != NULL) | |
1877 | fatal("%s: authctxt->methoddata already set (%p)", | |
1878 | __func__, authctxt->methoddata); | |
1879 | ||
1880 | authctxt->methoddata = pctx = jpake_new(); | |
1881 | ||
1882 | /* | |
1883 | * Send request immediately, to get the protocol going while | |
1884 | * we do the initial computations. | |
1885 | */ | |
1886 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1887 | packet_put_cstring(authctxt->server_user); | |
1888 | packet_put_cstring(authctxt->service); | |
1889 | packet_put_cstring(authctxt->method->name); | |
1890 | packet_send(); | |
1891 | packet_write_wait(); | |
1892 | ||
1893 | jpake_step1(pctx->grp, | |
1894 | &pctx->client_id, &pctx->client_id_len, | |
1895 | &pctx->x1, &pctx->x2, &pctx->g_x1, &pctx->g_x2, | |
1896 | &x1_proof, &x1_proof_len, | |
1897 | &x2_proof, &x2_proof_len); | |
1898 | ||
1899 | JPAKE_DEBUG_CTX((pctx, "step 1 sending in %s", __func__)); | |
1900 | ||
1901 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP1); | |
1902 | packet_put_string(pctx->client_id, pctx->client_id_len); | |
1903 | packet_put_bignum2(pctx->g_x1); | |
1904 | packet_put_bignum2(pctx->g_x2); | |
1905 | packet_put_string(x1_proof, x1_proof_len); | |
1906 | packet_put_string(x2_proof, x2_proof_len); | |
1907 | packet_send(); | |
1908 | ||
1909 | bzero(x1_proof, x1_proof_len); | |
1910 | bzero(x2_proof, x2_proof_len); | |
1911 | xfree(x1_proof); | |
1912 | xfree(x2_proof); | |
1913 | ||
1914 | /* Expect step 1 packet from peer */ | |
1915 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, | |
1916 | input_userauth_jpake_server_step1); | |
1917 | ||
1918 | return 1; | |
1919 | } | |
1920 | ||
1921 | void | |
1922 | userauth_jpake_cleanup(Authctxt *authctxt) | |
1923 | { | |
1924 | debug3("%s: clean up", __func__); | |
1925 | if (authctxt->methoddata != NULL) { | |
1926 | jpake_free(authctxt->methoddata); | |
1927 | authctxt->methoddata = NULL; | |
1928 | } | |
1929 | } | |
1930 | #endif /* JPAKE */ | |
1931 | ||
3c0ef626 | 1932 | /* find auth method */ |
1933 | ||
1934 | /* | |
1935 | * given auth method name, if configurable options permit this method fill | |
1936 | * in auth_ident field and return true, otherwise return false. | |
1937 | */ | |
1938 | static int | |
1939 | authmethod_is_enabled(Authmethod *method) | |
1940 | { | |
1941 | if (method == NULL) | |
1942 | return 0; | |
1943 | /* return false if options indicate this method is disabled */ | |
1944 | if (method->enabled == NULL || *method->enabled == 0) | |
1945 | return 0; | |
1946 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1947 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1948 | return 0; | |
1949 | return 1; | |
1950 | } | |
1951 | ||
1952 | static Authmethod * | |
1953 | authmethod_lookup(const char *name) | |
1954 | { | |
1955 | Authmethod *method = NULL; | |
1956 | if (name != NULL) | |
1957 | for (method = authmethods; method->name != NULL; method++) | |
1958 | if (strcmp(name, method->name) == 0) | |
1959 | return method; | |
1960 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1961 | return NULL; | |
1962 | } | |
1963 | ||
1964 | /* XXX internal state */ | |
1965 | static Authmethod *current = NULL; | |
1966 | static char *supported = NULL; | |
1967 | static char *preferred = NULL; | |
276b07a3 | 1968 | |
3c0ef626 | 1969 | /* |
1970 | * Given the authentication method list sent by the server, return the | |
1971 | * next method we should try. If the server initially sends a nil list, | |
1972 | * use a built-in default list. | |
1973 | */ | |
1974 | static Authmethod * | |
1975 | authmethod_get(char *authlist) | |
1976 | { | |
3c0ef626 | 1977 | char *name = NULL; |
1e608e42 | 1978 | u_int next; |
3c0ef626 | 1979 | |
1980 | /* Use a suitable default if we're passed a nil list. */ | |
1981 | if (authlist == NULL || strlen(authlist) == 0) | |
1982 | authlist = options.preferred_authentications; | |
1983 | ||
1984 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
1985 | debug3("start over, passed a different list %s", authlist); | |
1986 | if (supported != NULL) | |
1987 | xfree(supported); | |
1988 | supported = xstrdup(authlist); | |
1989 | preferred = options.preferred_authentications; | |
1990 | debug3("preferred %s", preferred); | |
1991 | current = NULL; | |
1992 | } else if (current != NULL && authmethod_is_enabled(current)) | |
1993 | return current; | |
1994 | ||
1995 | for (;;) { | |
1996 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
bfe49944 | 1997 | debug("No more authentication methods to try."); |
3c0ef626 | 1998 | current = NULL; |
1999 | return NULL; | |
2000 | } | |
2001 | preferred += next; | |
2002 | debug3("authmethod_lookup %s", name); | |
2003 | debug3("remaining preferred: %s", preferred); | |
2004 | if ((current = authmethod_lookup(name)) != NULL && | |
2005 | authmethod_is_enabled(current)) { | |
2006 | debug3("authmethod_is_enabled %s", name); | |
bfe49944 | 2007 | debug("Next authentication method: %s", name); |
3c0ef626 | 2008 | return current; |
2009 | } | |
2010 | } | |
2011 | } | |
2012 | ||
3c0ef626 | 2013 | static char * |
2014 | authmethods_get(void) | |
2015 | { | |
2016 | Authmethod *method = NULL; | |
1e608e42 | 2017 | Buffer b; |
2018 | char *list; | |
3c0ef626 | 2019 | |
1e608e42 | 2020 | buffer_init(&b); |
3c0ef626 | 2021 | for (method = authmethods; method->name != NULL; method++) { |
2022 | if (authmethod_is_enabled(method)) { | |
1e608e42 | 2023 | if (buffer_len(&b) > 0) |
2024 | buffer_append(&b, ",", 1); | |
2025 | buffer_append(&b, method->name, strlen(method->name)); | |
3c0ef626 | 2026 | } |
2027 | } | |
1e608e42 | 2028 | buffer_append(&b, "\0", 1); |
2029 | list = xstrdup(buffer_ptr(&b)); | |
2030 | buffer_free(&b); | |
2031 | return list; | |
3c0ef626 | 2032 | } |
5262cbfb | 2033 |