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b5afdff5 | 1 | /* $OpenBSD: sshconnect2.c,v 1.171 2009/03/05 07:18:19 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" |
b5afdff5 | 71 | #include "schnorr.h" |
5262cbfb | 72 | #include "jpake.h" |
3c0ef626 | 73 | |
5598e598 | 74 | #ifdef GSSAPI |
75 | #include "ssh-gss.h" | |
76 | #endif | |
77 | ||
3c0ef626 | 78 | /* import */ |
79 | extern char *client_version_string; | |
80 | extern char *server_version_string; | |
81 | extern Options options; | |
76d45d2f | 82 | extern Kex *xxx_kex; |
83 | ||
84 | /* tty_flag is set in ssh.c. use this in ssh_userauth2 */ | |
85 | /* if it is set then prevent the switch to the null cipher */ | |
86 | ||
87 | extern int tty_flag; | |
473db5ab | 88 | |
89 | /* tty_flag is set in ssh.c. use this in ssh_userauth2 */ | |
90 | /* if it is set then prevent the switch to the null cipher */ | |
91 | ||
92 | extern int tty_flag; | |
3c0ef626 | 93 | |
d3057ca4 | 94 | /* tty_flag is set in ssh.c. use this in ssh_userauth2 */ |
95 | /* if it is set then prevent the switch to the null cipher */ | |
96 | ||
97 | extern int tty_flag; | |
98 | ||
3c0ef626 | 99 | /* |
100 | * SSH2 key exchange | |
101 | */ | |
102 | ||
103 | u_char *session_id2 = NULL; | |
7cac2b65 | 104 | u_int session_id2_len = 0; |
3c0ef626 | 105 | |
106 | char *xxx_host; | |
107 | struct sockaddr *xxx_hostaddr; | |
108 | ||
109 | Kex *xxx_kex = NULL; | |
110 | ||
111 | static int | |
112 | verify_host_key_callback(Key *hostkey) | |
113 | { | |
114 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) | |
115 | fatal("Host key verification failed."); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | void | |
120 | ssh_kex2(char *host, struct sockaddr *hostaddr) | |
121 | { | |
122 | Kex *kex; | |
fe4ad273 | 123 | |
1e608e42 | 124 | #ifdef GSSAPI |
fe4ad273 | 125 | char *orig = NULL, *gss = NULL; |
f713db99 | 126 | char *gss_host = NULL; |
1e608e42 | 127 | #endif |
3c0ef626 | 128 | |
129 | xxx_host = host; | |
130 | xxx_hostaddr = hostaddr; | |
131 | ||
5598e598 | 132 | #ifdef GSSAPI |
7a056ed1 | 133 | if (options.gss_keyex) { |
f713db99 | 134 | /* Add the GSSAPI mechanisms currently supported on this |
135 | * client to the key exchange algorithm proposal */ | |
136 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
137 | ||
138 | if (options.gss_trust_dns) | |
139 | gss_host = (char *)get_canonical_hostname(1); | |
140 | else | |
141 | gss_host = host; | |
142 | ||
f97edba6 | 143 | gss = ssh_gssapi_client_mechanisms(gss_host, options.gss_client_identity); |
f713db99 | 144 | if (gss) { |
145 | debug("Offering GSSAPI proposal: %s", gss); | |
146 | xasprintf(&myproposal[PROPOSAL_KEX_ALGS], | |
147 | "%s,%s", gss, orig); | |
148 | } | |
7a056ed1 | 149 | } |
5598e598 | 150 | #endif |
151 | ||
3c0ef626 | 152 | if (options.ciphers == (char *)-1) { |
7cac2b65 | 153 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
3c0ef626 | 154 | options.ciphers = NULL; |
155 | } | |
156 | if (options.ciphers != NULL) { | |
157 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
158 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
4834571d | 159 | } |
3c0ef626 | 160 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
161 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
162 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
163 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
164 | if (options.compression) { | |
165 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
2ce0bfe4 | 166 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none"; |
3c0ef626 | 167 | } else { |
168 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
2ce0bfe4 | 169 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib"; |
3c0ef626 | 170 | } |
171 | if (options.macs != NULL) { | |
172 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
173 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
174 | } | |
175 | if (options.hostkeyalgorithms != NULL) | |
1e608e42 | 176 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
3c0ef626 | 177 | options.hostkeyalgorithms; |
178 | ||
1e608e42 | 179 | #ifdef GSSAPI |
fe4ad273 | 180 | /* If we've got GSSAPI algorithms, then we also support the |
181 | * 'null' hostkey, as a last resort */ | |
7a056ed1 | 182 | if (options.gss_keyex && gss) { |
fe4ad273 | 183 | orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]; |
f713db99 | 184 | xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS], |
fe4ad273 | 185 | "%s,null", orig); |
f97edba6 | 186 | xfree(gss); |
1e608e42 | 187 | } |
188 | #endif | |
7cac2b65 | 189 | |
190 | if (options.rekey_limit) | |
e74dc197 | 191 | packet_set_rekey_limit((u_int32_t)options.rekey_limit); |
7cac2b65 | 192 | |
3c0ef626 | 193 | /* start key exchange */ |
194 | kex = kex_setup(myproposal); | |
bfe49944 | 195 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
7e82606e | 196 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
bfe49944 | 197 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
f713db99 | 198 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
bfe49944 | 199 | #ifdef GSSAPI |
f97edba6 | 200 | if (options.gss_keyex) { |
201 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client; | |
202 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_client; | |
203 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_client; | |
204 | } | |
bfe49944 | 205 | #endif |
3c0ef626 | 206 | kex->client_version_string=client_version_string; |
207 | kex->server_version_string=server_version_string; | |
208 | kex->verify_host_key=&verify_host_key_callback; | |
7cac2b65 | 209 | |
fe4ad273 | 210 | #ifdef GSSAPI |
f97edba6 | 211 | if (options.gss_keyex) { |
212 | kex->gss_deleg_creds = options.gss_deleg_creds; | |
213 | kex->gss_trust_dns = options.gss_trust_dns; | |
214 | kex->gss_client = options.gss_client_identity; | |
215 | kex->gss_host = gss_host; | |
216 | } | |
fe4ad273 | 217 | #endif |
218 | ||
3c0ef626 | 219 | xxx_kex = kex; |
220 | ||
221 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
222 | ||
223 | session_id2 = kex->session_id; | |
224 | session_id2_len = kex->session_id_len; | |
225 | ||
226 | #ifdef DEBUG_KEXDH | |
227 | /* send 1st encrypted/maced/compressed message */ | |
228 | packet_start(SSH2_MSG_IGNORE); | |
229 | packet_put_cstring("markus"); | |
230 | packet_send(); | |
231 | packet_write_wait(); | |
232 | #endif | |
3c0ef626 | 233 | } |
234 | ||
235 | /* | |
236 | * Authenticate user | |
237 | */ | |
238 | ||
239 | typedef struct Authctxt Authctxt; | |
240 | typedef struct Authmethod Authmethod; | |
7cac2b65 | 241 | typedef struct identity Identity; |
242 | typedef struct idlist Idlist; | |
243 | ||
244 | struct identity { | |
245 | TAILQ_ENTRY(identity) next; | |
246 | AuthenticationConnection *ac; /* set if agent supports key */ | |
247 | Key *key; /* public/private key */ | |
248 | char *filename; /* comment for agent-only keys */ | |
249 | int tried; | |
250 | int isprivate; /* key points to the private key */ | |
251 | }; | |
252 | TAILQ_HEAD(idlist, identity); | |
3c0ef626 | 253 | |
254 | struct Authctxt { | |
255 | const char *server_user; | |
256 | const char *local_user; | |
257 | const char *host; | |
258 | const char *service; | |
259 | Authmethod *method; | |
260 | int success; | |
261 | char *authlist; | |
262 | /* pubkey */ | |
7cac2b65 | 263 | Idlist keys; |
3c0ef626 | 264 | AuthenticationConnection *agent; |
265 | /* hostbased */ | |
44a053a3 | 266 | Sensitive *sensitive; |
3c0ef626 | 267 | /* kbd-interactive */ |
268 | int info_req_seen; | |
5598e598 | 269 | /* generic */ |
270 | void *methoddata; | |
3c0ef626 | 271 | }; |
272 | struct Authmethod { | |
273 | char *name; /* string to compare against server's list */ | |
274 | int (*userauth)(Authctxt *authctxt); | |
5262cbfb | 275 | void (*cleanup)(Authctxt *authctxt); |
3c0ef626 | 276 | int *enabled; /* flag in option struct that enables method */ |
277 | int *batch_flag; /* flag in option struct that disables method */ | |
278 | }; | |
279 | ||
1e608e42 | 280 | void input_userauth_success(int, u_int32_t, void *); |
281 | void input_userauth_failure(int, u_int32_t, void *); | |
282 | void input_userauth_banner(int, u_int32_t, void *); | |
283 | void input_userauth_error(int, u_int32_t, void *); | |
284 | void input_userauth_info_req(int, u_int32_t, void *); | |
285 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
510132b6 | 286 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
5262cbfb | 287 | void input_userauth_jpake_server_step1(int, u_int32_t, void *); |
288 | void input_userauth_jpake_server_step2(int, u_int32_t, void *); | |
289 | void input_userauth_jpake_server_confirm(int, u_int32_t, void *); | |
3c0ef626 | 290 | |
1e608e42 | 291 | int userauth_none(Authctxt *); |
292 | int userauth_pubkey(Authctxt *); | |
293 | int userauth_passwd(Authctxt *); | |
294 | int userauth_kbdint(Authctxt *); | |
295 | int userauth_hostbased(Authctxt *); | |
5262cbfb | 296 | int userauth_jpake(Authctxt *); |
297 | ||
298 | void userauth_jpake_cleanup(Authctxt *); | |
7cac2b65 | 299 | |
5598e598 | 300 | #ifdef GSSAPI |
1e608e42 | 301 | int userauth_external(Authctxt *authctxt); |
302 | int userauth_gssapi(Authctxt *authctxt); | |
540d72c3 | 303 | int userauth_gssapi_with_mic(Authctxt *authctxt); |
304 | int userauth_gssapi_without_mic(Authctxt *authctxt); | |
e23e524c | 305 | void input_gssapi_response(int type, u_int32_t, void *); |
306 | void input_gssapi_token(int type, u_int32_t, void *); | |
307 | void input_gssapi_hash(int type, u_int32_t, void *); | |
23987cb8 | 308 | void input_gssapi_error(int, u_int32_t, void *); |
e23e524c | 309 | void input_gssapi_errtok(int, u_int32_t, void *); |
fe4ad273 | 310 | int userauth_gsskeyex(Authctxt *authctxt); |
5598e598 | 311 | #endif |
312 | ||
1e608e42 | 313 | void userauth(Authctxt *, char *); |
3c0ef626 | 314 | |
7cac2b65 | 315 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
316 | static void pubkey_prepare(Authctxt *); | |
317 | static void pubkey_cleanup(Authctxt *); | |
318 | static Key *load_identity_file(char *); | |
3c0ef626 | 319 | |
320 | static Authmethod *authmethod_get(char *authlist); | |
321 | static Authmethod *authmethod_lookup(const char *name); | |
322 | static char *authmethods_get(void); | |
323 | ||
324 | Authmethod authmethods[] = { | |
5598e598 | 325 | #ifdef GSSAPI |
fe4ad273 | 326 | {"gssapi-keyex", |
327 | userauth_gsskeyex, | |
737cfc81 | 328 | NULL, |
fe4ad273 | 329 | &options.gss_authentication, |
330 | NULL}, | |
5598e598 | 331 | {"external-keyx", |
332 | userauth_external, | |
737cfc81 | 333 | NULL, |
5598e598 | 334 | &options.gss_authentication, |
335 | NULL}, | |
540d72c3 | 336 | {"gssapi-with-mic", |
51b9ca75 | 337 | userauth_gssapi, |
5262cbfb | 338 | NULL, |
540d72c3 | 339 | &options.gss_authentication, |
340 | NULL}, | |
5598e598 | 341 | {"gssapi", |
51b9ca75 | 342 | userauth_gssapi, |
737cfc81 | 343 | NULL, |
5598e598 | 344 | &options.gss_authentication, |
345 | NULL}, | |
346 | #endif | |
3c0ef626 | 347 | {"hostbased", |
348 | userauth_hostbased, | |
5262cbfb | 349 | NULL, |
3c0ef626 | 350 | &options.hostbased_authentication, |
351 | NULL}, | |
352 | {"publickey", | |
353 | userauth_pubkey, | |
5262cbfb | 354 | NULL, |
3c0ef626 | 355 | &options.pubkey_authentication, |
356 | NULL}, | |
5262cbfb | 357 | #ifdef JPAKE |
358 | {"jpake-01@openssh.com", | |
359 | userauth_jpake, | |
360 | userauth_jpake_cleanup, | |
361 | &options.zero_knowledge_password_authentication, | |
362 | &options.batch_mode}, | |
363 | #endif | |
3c0ef626 | 364 | {"keyboard-interactive", |
365 | userauth_kbdint, | |
5262cbfb | 366 | NULL, |
3c0ef626 | 367 | &options.kbd_interactive_authentication, |
368 | &options.batch_mode}, | |
369 | {"password", | |
370 | userauth_passwd, | |
5262cbfb | 371 | NULL, |
3c0ef626 | 372 | &options.password_authentication, |
373 | &options.batch_mode}, | |
374 | {"none", | |
375 | userauth_none, | |
376 | NULL, | |
5262cbfb | 377 | NULL, |
3c0ef626 | 378 | NULL}, |
5262cbfb | 379 | {NULL, NULL, NULL, NULL, NULL} |
3c0ef626 | 380 | }; |
381 | ||
382 | void | |
383 | ssh_userauth2(const char *local_user, const char *server_user, char *host, | |
44a053a3 | 384 | Sensitive *sensitive) |
3c0ef626 | 385 | { |
386 | Authctxt authctxt; | |
387 | int type; | |
3c0ef626 | 388 | |
389 | if (options.challenge_response_authentication) | |
390 | options.kbd_interactive_authentication = 1; | |
391 | ||
3c0ef626 | 392 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
393 | packet_put_cstring("ssh-userauth"); | |
394 | packet_send(); | |
bfe49944 | 395 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
3c0ef626 | 396 | packet_write_wait(); |
1e608e42 | 397 | type = packet_read(); |
bfe49944 | 398 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
399 | fatal("Server denied authentication request: %d", type); | |
3c0ef626 | 400 | if (packet_remaining() > 0) { |
1e608e42 | 401 | char *reply = packet_get_string(NULL); |
bfe49944 | 402 | debug2("service_accept: %s", reply); |
3c0ef626 | 403 | xfree(reply); |
404 | } else { | |
bfe49944 | 405 | debug2("buggy server: service_accept w/o service"); |
3c0ef626 | 406 | } |
1e608e42 | 407 | packet_check_eom(); |
bfe49944 | 408 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
3c0ef626 | 409 | |
410 | if (options.preferred_authentications == NULL) | |
411 | options.preferred_authentications = authmethods_get(); | |
412 | ||
413 | /* setup authentication context */ | |
414 | memset(&authctxt, 0, sizeof(authctxt)); | |
7cac2b65 | 415 | pubkey_prepare(&authctxt); |
3c0ef626 | 416 | authctxt.server_user = server_user; |
417 | authctxt.local_user = local_user; | |
418 | authctxt.host = host; | |
419 | authctxt.service = "ssh-connection"; /* service name */ | |
420 | authctxt.success = 0; | |
421 | authctxt.method = authmethod_lookup("none"); | |
422 | authctxt.authlist = NULL; | |
5598e598 | 423 | authctxt.methoddata = NULL; |
44a053a3 | 424 | authctxt.sensitive = sensitive; |
3c0ef626 | 425 | authctxt.info_req_seen = 0; |
426 | if (authctxt.method == NULL) | |
427 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
428 | ||
429 | /* initial userauth request */ | |
430 | userauth_none(&authctxt); | |
431 | ||
432 | dispatch_init(&input_userauth_error); | |
433 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
434 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
435 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); | |
436 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
437 | ||
7cac2b65 | 438 | pubkey_cleanup(&authctxt); |
439 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); | |
f713db99 | 440 | |
441 | /* if the user wants to use the none cipher do it */ | |
442 | /* post authentication and only if the right conditions are met */ | |
443 | /* both of the NONE commands must be true and there must be no */ | |
444 | /* tty allocated */ | |
445 | if ((options.none_switch == 1) && (options.none_enabled == 1)) | |
473db5ab | 446 | { |
f713db99 | 447 | if (!tty_flag) /* no null on tty sessions */ |
448 | { | |
449 | debug("Requesting none rekeying..."); | |
450 | myproposal[PROPOSAL_ENC_ALGS_STOC] = "none"; | |
451 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = "none"; | |
452 | kex_prop2buf(&xxx_kex->my,myproposal); | |
453 | packet_request_rekeying(); | |
454 | fprintf(stderr, "WARNING: ENABLED NONE CIPHER\n"); | |
455 | } | |
456 | else | |
457 | { | |
458 | /* requested NONE cipher when in a tty */ | |
459 | debug("Cannot switch to NONE cipher with tty allocated"); | |
460 | fprintf(stderr, "NONE cipher switch disabled when a TTY is allocated\n"); | |
461 | } | |
473db5ab | 462 | } |
bfe49944 | 463 | debug("Authentication succeeded (%s).", authctxt.method->name); |
3c0ef626 | 464 | } |
7cac2b65 | 465 | |
3c0ef626 | 466 | void |
467 | userauth(Authctxt *authctxt, char *authlist) | |
468 | { | |
5262cbfb | 469 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
470 | authctxt->method->cleanup(authctxt); | |
471 | ||
7cac2b65 | 472 | if (authctxt->methoddata) { |
5598e598 | 473 | xfree(authctxt->methoddata); |
7cac2b65 | 474 | authctxt->methoddata = NULL; |
5598e598 | 475 | } |
3c0ef626 | 476 | if (authlist == NULL) { |
477 | authlist = authctxt->authlist; | |
478 | } else { | |
479 | if (authctxt->authlist) | |
480 | xfree(authctxt->authlist); | |
481 | authctxt->authlist = authlist; | |
482 | } | |
483 | for (;;) { | |
484 | Authmethod *method = authmethod_get(authlist); | |
485 | if (method == NULL) | |
486 | fatal("Permission denied (%s).", authlist); | |
487 | authctxt->method = method; | |
7cac2b65 | 488 | |
489 | /* reset the per method handler */ | |
490 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, | |
491 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); | |
492 | ||
493 | /* and try new method */ | |
3c0ef626 | 494 | if (method->userauth(authctxt) != 0) { |
495 | debug2("we sent a %s packet, wait for reply", method->name); | |
496 | break; | |
497 | } else { | |
498 | debug2("we did not send a packet, disable method"); | |
499 | method->enabled = NULL; | |
500 | } | |
501 | } | |
502 | } | |
276b07a3 | 503 | |
5262cbfb | 504 | /* ARGSUSED */ |
3c0ef626 | 505 | void |
1e608e42 | 506 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 507 | { |
508 | fatal("input_userauth_error: bad message during authentication: " | |
2ce0bfe4 | 509 | "type %d", type); |
3c0ef626 | 510 | } |
276b07a3 | 511 | |
5262cbfb | 512 | /* ARGSUSED */ |
3c0ef626 | 513 | void |
1e608e42 | 514 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 515 | { |
5156b1a1 | 516 | char *msg, *raw, *lang; |
517 | u_int len; | |
540d72c3 | 518 | |
3c0ef626 | 519 | debug3("input_userauth_banner"); |
5156b1a1 | 520 | raw = packet_get_string(&len); |
3c0ef626 | 521 | lang = packet_get_string(NULL); |
5262cbfb | 522 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) { |
5156b1a1 | 523 | if (len > 65536) |
524 | len = 65536; | |
5262cbfb | 525 | msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */ |
526 | strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL); | |
540d72c3 | 527 | fprintf(stderr, "%s", msg); |
5156b1a1 | 528 | xfree(msg); |
529 | } | |
530 | xfree(raw); | |
3c0ef626 | 531 | xfree(lang); |
532 | } | |
276b07a3 | 533 | |
5262cbfb | 534 | /* ARGSUSED */ |
3c0ef626 | 535 | void |
1e608e42 | 536 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 537 | { |
538 | Authctxt *authctxt = ctxt; | |
539 | if (authctxt == NULL) | |
540 | fatal("input_userauth_success: no authentication context"); | |
540d72c3 | 541 | if (authctxt->authlist) { |
3c0ef626 | 542 | xfree(authctxt->authlist); |
540d72c3 | 543 | authctxt->authlist = NULL; |
544 | } | |
545 | if (authctxt->methoddata) { | |
5598e598 | 546 | xfree(authctxt->methoddata); |
540d72c3 | 547 | authctxt->methoddata = NULL; |
548 | } | |
3c0ef626 | 549 | authctxt->success = 1; /* break out */ |
550 | } | |
276b07a3 | 551 | |
5262cbfb | 552 | /* ARGSUSED */ |
3c0ef626 | 553 | void |
1e608e42 | 554 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 555 | { |
556 | Authctxt *authctxt = ctxt; | |
557 | char *authlist = NULL; | |
558 | int partial; | |
559 | ||
560 | if (authctxt == NULL) | |
561 | fatal("input_userauth_failure: no authentication context"); | |
562 | ||
563 | authlist = packet_get_string(NULL); | |
564 | partial = packet_get_char(); | |
1e608e42 | 565 | packet_check_eom(); |
3c0ef626 | 566 | |
567 | if (partial != 0) | |
7cac2b65 | 568 | logit("Authenticated with partial success."); |
bfe49944 | 569 | debug("Authentications that can continue: %s", authlist); |
3c0ef626 | 570 | |
3c0ef626 | 571 | userauth(authctxt, authlist); |
572 | } | |
5262cbfb | 573 | |
574 | /* ARGSUSED */ | |
3c0ef626 | 575 | void |
1e608e42 | 576 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 577 | { |
578 | Authctxt *authctxt = ctxt; | |
579 | Key *key = NULL; | |
7cac2b65 | 580 | Identity *id = NULL; |
3c0ef626 | 581 | Buffer b; |
1e608e42 | 582 | int pktype, sent = 0; |
583 | u_int alen, blen; | |
584 | char *pkalg, *fp; | |
585 | u_char *pkblob; | |
3c0ef626 | 586 | |
587 | if (authctxt == NULL) | |
588 | fatal("input_userauth_pk_ok: no authentication context"); | |
589 | if (datafellows & SSH_BUG_PKOK) { | |
590 | /* this is similar to SSH_BUG_PKAUTH */ | |
591 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
592 | pkblob = packet_get_string(&blen); | |
593 | buffer_init(&b); | |
594 | buffer_append(&b, pkblob, blen); | |
595 | pkalg = buffer_get_string(&b, &alen); | |
596 | buffer_free(&b); | |
597 | } else { | |
598 | pkalg = packet_get_string(&alen); | |
599 | pkblob = packet_get_string(&blen); | |
600 | } | |
1e608e42 | 601 | packet_check_eom(); |
3c0ef626 | 602 | |
7cac2b65 | 603 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
3c0ef626 | 604 | |
7cac2b65 | 605 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
606 | debug("unknown pkalg %s", pkalg); | |
607 | goto done; | |
608 | } | |
609 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
610 | debug("no key from blob. pkalg %s", pkalg); | |
611 | goto done; | |
612 | } | |
613 | if (key->type != pktype) { | |
614 | error("input_userauth_pk_ok: type mismatch " | |
615 | "for decoded key (received %d, expected %d)", | |
616 | key->type, pktype); | |
617 | goto done; | |
618 | } | |
619 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); | |
620 | debug2("input_userauth_pk_ok: fp %s", fp); | |
621 | xfree(fp); | |
622 | ||
540d72c3 | 623 | /* |
624 | * search keys in the reverse order, because last candidate has been | |
625 | * moved to the end of the queue. this also avoids confusion by | |
626 | * duplicate keys | |
627 | */ | |
7e82606e | 628 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
7cac2b65 | 629 | if (key_equal(key, id->key)) { |
630 | sent = sign_and_send_pubkey(authctxt, id); | |
3c0ef626 | 631 | break; |
632 | } | |
7cac2b65 | 633 | } |
634 | done: | |
3c0ef626 | 635 | if (key != NULL) |
636 | key_free(key); | |
637 | xfree(pkalg); | |
638 | xfree(pkblob); | |
639 | ||
d03f4262 | 640 | /* try another method if we did not send a packet */ |
3c0ef626 | 641 | if (sent == 0) |
642 | userauth(authctxt, NULL); | |
3c0ef626 | 643 | } |
644 | ||
5598e598 | 645 | #ifdef GSSAPI |
540d72c3 | 646 | int |
5598e598 | 647 | userauth_gssapi(Authctxt *authctxt) |
648 | { | |
23987cb8 | 649 | Gssctxt *gssctxt = NULL; |
540d72c3 | 650 | static gss_OID_set gss_supported = NULL; |
2ce0bfe4 | 651 | static u_int mech = 0; |
23987cb8 | 652 | OM_uint32 min; |
7cac2b65 | 653 | int ok = 0; |
fe4ad273 | 654 | char *gss_host = NULL; |
23987cb8 | 655 | |
35094e47 | 656 | if (!options.gss_authentication) { |
657 | verbose("GSSAPI authentication disabled."); | |
658 | return 0; | |
659 | } | |
660 | ||
fe4ad273 | 661 | if (options.gss_trust_dns) |
662 | gss_host = (char *)get_canonical_hostname(1); | |
663 | else | |
664 | gss_host = (char *)authctxt->host; | |
665 | ||
7cac2b65 | 666 | /* Try one GSSAPI method at a time, rather than sending them all at |
667 | * once. */ | |
5598e598 | 668 | |
540d72c3 | 669 | if (gss_supported == NULL) |
f97edba6 | 670 | if (GSS_ERROR(gss_indicate_mechs(&min, &gss_supported))) { |
671 | gss_supported = NULL; | |
672 | return 0; | |
673 | } | |
b59afbfe | 674 | |
7cac2b65 | 675 | /* Check to see if the mechanism is usable before we offer it */ |
540d72c3 | 676 | while (mech < gss_supported->count && !ok) { |
7cac2b65 | 677 | /* My DER encoding requires length<128 */ |
540d72c3 | 678 | if (gss_supported->elements[mech].length < 128 && |
30460aeb | 679 | ssh_gssapi_check_mechanism(&gssctxt, |
f97edba6 | 680 | &gss_supported->elements[mech], gss_host, |
681 | options.gss_client_identity)) { | |
7cac2b65 | 682 | ok = 1; /* Mechanism works */ |
23987cb8 | 683 | } else { |
684 | mech++; | |
685 | } | |
5598e598 | 686 | } |
7cac2b65 | 687 | |
2ce0bfe4 | 688 | if (!ok) |
689 | return 0; | |
7cac2b65 | 690 | |
5598e598 | 691 | authctxt->methoddata=(void *)gssctxt; |
7cac2b65 | 692 | |
5598e598 | 693 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
23987cb8 | 694 | packet_put_cstring(authctxt->server_user); |
5598e598 | 695 | packet_put_cstring(authctxt->service); |
7cac2b65 | 696 | packet_put_cstring(authctxt->method->name); |
697 | ||
23987cb8 | 698 | packet_put_int(1); |
5598e598 | 699 | |
dfddba3d | 700 | packet_put_int((gss_supported->elements[mech].length) + 2); |
701 | packet_put_char(SSH_GSS_OIDTYPE); | |
702 | packet_put_char(gss_supported->elements[mech].length); | |
703 | packet_put_raw(gss_supported->elements[mech].elements, | |
704 | gss_supported->elements[mech].length); | |
91a31bec | 705 | |
7cac2b65 | 706 | packet_send(); |
707 | ||
708 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); | |
709 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); | |
710 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); | |
711 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); | |
5598e598 | 712 | |
23987cb8 | 713 | mech++; /* Move along to next candidate */ |
91a31bec | 714 | |
7cac2b65 | 715 | return 1; |
5598e598 | 716 | } |
717 | ||
540d72c3 | 718 | static OM_uint32 |
719 | process_gssapi_token(void *ctxt, gss_buffer_t recv_tok) | |
720 | { | |
721 | Authctxt *authctxt = ctxt; | |
722 | Gssctxt *gssctxt = authctxt->methoddata; | |
723 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; | |
2ce0bfe4 | 724 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
725 | gss_buffer_desc gssbuf; | |
540d72c3 | 726 | OM_uint32 status, ms, flags; |
727 | Buffer b; | |
728 | ||
729 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
730 | recv_tok, &send_tok, &flags); | |
731 | ||
732 | if (send_tok.length > 0) { | |
733 | if (GSS_ERROR(status)) | |
734 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); | |
735 | else | |
736 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); | |
737 | ||
738 | packet_put_string(send_tok.value, send_tok.length); | |
739 | packet_send(); | |
740 | gss_release_buffer(&ms, &send_tok); | |
741 | } | |
742 | ||
743 | if (status == GSS_S_COMPLETE) { | |
744 | /* send either complete or MIC, depending on mechanism */ | |
51b9ca75 | 745 | if (strcmp(authctxt->method->name,"gssapi")==0 || |
746 | (!(flags & GSS_C_INTEG_FLAG))) { | |
540d72c3 | 747 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); |
748 | packet_send(); | |
749 | } else { | |
750 | ssh_gssapi_buildmic(&b, authctxt->server_user, | |
751 | authctxt->service, "gssapi-with-mic"); | |
752 | ||
753 | gssbuf.value = buffer_ptr(&b); | |
754 | gssbuf.length = buffer_len(&b); | |
755 | ||
756 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); | |
757 | ||
758 | if (!GSS_ERROR(status)) { | |
759 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC); | |
760 | packet_put_string(mic.value, mic.length); | |
761 | ||
762 | packet_send(); | |
763 | } | |
764 | ||
765 | buffer_free(&b); | |
766 | gss_release_buffer(&ms, &mic); | |
767 | } | |
768 | } | |
769 | ||
770 | return status; | |
771 | } | |
772 | ||
5262cbfb | 773 | /* ARGSUSED */ |
5598e598 | 774 | void |
7cac2b65 | 775 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
5598e598 | 776 | { |
777 | Authctxt *authctxt = ctxt; | |
778 | Gssctxt *gssctxt; | |
f713db99 | 779 | u_int oidlen; |
780 | u_char *oidv; | |
7cac2b65 | 781 | |
5598e598 | 782 | if (authctxt == NULL) |
783 | fatal("input_gssapi_response: no authentication context"); | |
784 | gssctxt = authctxt->methoddata; | |
7cac2b65 | 785 | |
5598e598 | 786 | /* Setup our OID */ |
7cac2b65 | 787 | oidv = packet_get_string(&oidlen); |
788 | ||
dfddba3d | 789 | if (oidlen <= 2 || |
790 | oidv[0] != SSH_GSS_OIDTYPE || | |
791 | oidv[1] != oidlen - 2) { | |
792 | xfree(oidv); | |
793 | debug("Badly encoded mechanism OID received"); | |
794 | userauth(authctxt, NULL); | |
795 | return; | |
23987cb8 | 796 | } |
7cac2b65 | 797 | |
dfddba3d | 798 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
799 | fatal("Server returned different OID than expected"); | |
800 | ||
1e608e42 | 801 | packet_check_eom(); |
7cac2b65 | 802 | |
803 | xfree(oidv); | |
804 | ||
540d72c3 | 805 | if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) { |
5598e598 | 806 | /* Start again with next method on list */ |
807 | debug("Trying to start again"); | |
7cac2b65 | 808 | userauth(authctxt, NULL); |
5598e598 | 809 | return; |
810 | } | |
5598e598 | 811 | } |
812 | ||
5262cbfb | 813 | /* ARGSUSED */ |
5598e598 | 814 | void |
1e608e42 | 815 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) |
5598e598 | 816 | { |
817 | Authctxt *authctxt = ctxt; | |
7cac2b65 | 818 | gss_buffer_desc recv_tok; |
540d72c3 | 819 | OM_uint32 status; |
007914b3 | 820 | u_int slen; |
7cac2b65 | 821 | |
5598e598 | 822 | if (authctxt == NULL) |
7cac2b65 | 823 | fatal("input_gssapi_response: no authentication context"); |
5598e598 | 824 | |
7cac2b65 | 825 | recv_tok.value = packet_get_string(&slen); |
826 | recv_tok.length = slen; /* safe typecast */ | |
5598e598 | 827 | |
1e608e42 | 828 | packet_check_eom(); |
7cac2b65 | 829 | |
540d72c3 | 830 | status = process_gssapi_token(ctxt, &recv_tok); |
7cac2b65 | 831 | |
832 | xfree(recv_tok.value); | |
833 | ||
5598e598 | 834 | if (GSS_ERROR(status)) { |
835 | /* Start again with the next method in the list */ | |
7cac2b65 | 836 | userauth(authctxt, NULL); |
5598e598 | 837 | return; |
838 | } | |
5598e598 | 839 | } |
840 | ||
5262cbfb | 841 | /* ARGSUSED */ |
e23e524c | 842 | void |
843 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) | |
844 | { | |
845 | Authctxt *authctxt = ctxt; | |
846 | Gssctxt *gssctxt; | |
7cac2b65 | 847 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
848 | gss_buffer_desc recv_tok; | |
849 | OM_uint32 status, ms; | |
850 | u_int len; | |
851 | ||
e23e524c | 852 | if (authctxt == NULL) |
853 | fatal("input_gssapi_response: no authentication context"); | |
854 | gssctxt = authctxt->methoddata; | |
e23e524c | 855 | |
7cac2b65 | 856 | recv_tok.value = packet_get_string(&len); |
857 | recv_tok.length = len; | |
e23e524c | 858 | |
859 | packet_check_eom(); | |
7cac2b65 | 860 | |
861 | /* Stick it into GSSAPI and see what it says */ | |
862 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, | |
2ce0bfe4 | 863 | &recv_tok, &send_tok, NULL); |
7cac2b65 | 864 | |
865 | xfree(recv_tok.value); | |
866 | gss_release_buffer(&ms, &send_tok); | |
867 | ||
868 | /* Server will be returning a failed packet after this one */ | |
e23e524c | 869 | } |
870 | ||
5262cbfb | 871 | /* ARGSUSED */ |
23987cb8 | 872 | void |
873 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) | |
874 | { | |
7cac2b65 | 875 | OM_uint32 maj, min; |
23987cb8 | 876 | char *msg; |
877 | char *lang; | |
7cac2b65 | 878 | |
23987cb8 | 879 | maj=packet_get_int(); |
880 | min=packet_get_int(); | |
881 | msg=packet_get_string(NULL); | |
882 | lang=packet_get_string(NULL); | |
883 | ||
884 | packet_check_eom(); | |
7cac2b65 | 885 | |
08822d99 | 886 | debug("Server GSSAPI Error:\n%s", msg); |
23987cb8 | 887 | xfree(msg); |
888 | xfree(lang); | |
889 | } | |
890 | ||
fe4ad273 | 891 | #ifdef GSI |
892 | extern | |
893 | const gss_OID_desc * const gss_mech_globus_gssapi_openssl; | |
894 | #define is_gsi_oid(oid) \ | |
895 | (oid->length == gss_mech_globus_gssapi_openssl->length && \ | |
896 | (memcmp(oid->elements, gss_mech_globus_gssapi_openssl->elements, \ | |
897 | oid->length) == 0)) | |
898 | #endif | |
899 | ||
5598e598 | 900 | int |
901 | userauth_external(Authctxt *authctxt) | |
902 | { | |
c7931c9a | 903 | static int attempt = 0; |
5598e598 | 904 | |
c7931c9a | 905 | if (attempt++ >= 1) |
906 | return 0; | |
5598e598 | 907 | |
41cbd9f8 | 908 | /* The client MUST NOT try this method if initial key exchange |
909 | was not performed using a GSSAPI-based key exchange | |
910 | method. */ | |
fe4ad273 | 911 | if (gss_kex_context == NULL) { |
41cbd9f8 | 912 | debug2("gsskex not performed, skipping external-keyx"); |
913 | return 0; | |
914 | } | |
915 | ||
c7931c9a | 916 | debug2("userauth_external"); |
917 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1baa1dac | 918 | #ifdef GSI |
c7931c9a | 919 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { |
920 | packet_put_cstring(""); | |
2e9d2d36 | 921 | } else { |
1baa1dac | 922 | #endif |
c7931c9a | 923 | packet_put_cstring(authctxt->server_user); |
1baa1dac | 924 | #ifdef GSI |
2e9d2d36 | 925 | } |
1baa1dac | 926 | #endif |
c7931c9a | 927 | packet_put_cstring(authctxt->service); |
928 | packet_put_cstring(authctxt->method->name); | |
929 | packet_send(); | |
930 | packet_write_wait(); | |
931 | return 1; | |
5598e598 | 932 | } |
fe4ad273 | 933 | int |
934 | userauth_gsskeyex(Authctxt *authctxt) | |
935 | { | |
936 | Buffer b; | |
937 | gss_buffer_desc gssbuf; | |
938 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; | |
939 | OM_uint32 ms; | |
940 | ||
941 | static int attempt = 0; | |
942 | if (attempt++ >= 1) | |
943 | return (0); | |
944 | ||
945 | if (gss_kex_context == NULL) { | |
946 | debug("No valid Key exchange context"); | |
947 | return (0); | |
948 | } | |
949 | ||
950 | #ifdef GSI | |
c7931c9a | 951 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { |
952 | ssh_gssapi_buildmic(&b, "", authctxt->service, "gssapi-keyex"); | |
fe4ad273 | 953 | } else { |
954 | #endif | |
c7931c9a | 955 | ssh_gssapi_buildmic(&b, authctxt->server_user, authctxt->service, |
956 | "gssapi-keyex"); | |
fe4ad273 | 957 | #ifdef GSI |
958 | } | |
959 | #endif | |
960 | ||
961 | gssbuf.value = buffer_ptr(&b); | |
962 | gssbuf.length = buffer_len(&b); | |
963 | ||
964 | if (GSS_ERROR(ssh_gssapi_sign(gss_kex_context, &gssbuf, &mic))) { | |
965 | buffer_free(&b); | |
966 | return (0); | |
967 | } | |
968 | ||
969 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
970 | #ifdef GSI | |
c7931c9a | 971 | if (options.implicit && is_gsi_oid(gss_kex_context->oid)) { |
972 | packet_put_cstring(""); | |
fe4ad273 | 973 | } else { |
974 | #endif | |
975 | packet_put_cstring(authctxt->server_user); | |
976 | #ifdef GSI | |
977 | } | |
978 | #endif | |
979 | packet_put_cstring(authctxt->service); | |
980 | packet_put_cstring(authctxt->method->name); | |
981 | packet_put_string(mic.value, mic.length); | |
982 | packet_send(); | |
983 | ||
984 | buffer_free(&b); | |
985 | gss_release_buffer(&ms, &mic); | |
986 | ||
987 | return (1); | |
988 | } | |
989 | ||
5598e598 | 990 | #endif /* GSSAPI */ |
991 | ||
3c0ef626 | 992 | int |
993 | userauth_none(Authctxt *authctxt) | |
994 | { | |
995 | /* initial userauth request */ | |
996 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
997 | packet_put_cstring(authctxt->server_user); | |
998 | packet_put_cstring(authctxt->service); | |
999 | packet_put_cstring(authctxt->method->name); | |
1000 | packet_send(); | |
1001 | return 1; | |
1002 | } | |
1003 | ||
1004 | int | |
1005 | userauth_passwd(Authctxt *authctxt) | |
1006 | { | |
1007 | static int attempt = 0; | |
510132b6 | 1008 | char prompt[150]; |
3c0ef626 | 1009 | char *password; |
1010 | ||
1011 | if (attempt++ >= options.number_of_password_prompts) | |
1012 | return 0; | |
1013 | ||
1e608e42 | 1014 | if (attempt != 1) |
3c0ef626 | 1015 | error("Permission denied, please try again."); |
1016 | ||
1017 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", | |
1018 | authctxt->server_user, authctxt->host); | |
1019 | password = read_passphrase(prompt, 0); | |
1020 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1021 | packet_put_cstring(authctxt->server_user); | |
1022 | packet_put_cstring(authctxt->service); | |
1023 | packet_put_cstring(authctxt->method->name); | |
1024 | packet_put_char(0); | |
1025 | packet_put_cstring(password); | |
1026 | memset(password, 0, strlen(password)); | |
1027 | xfree(password); | |
1028 | packet_add_padding(64); | |
1029 | packet_send(); | |
510132b6 | 1030 | |
44a053a3 | 1031 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
510132b6 | 1032 | &input_userauth_passwd_changereq); |
1033 | ||
3c0ef626 | 1034 | return 1; |
1035 | } | |
5262cbfb | 1036 | |
510132b6 | 1037 | /* |
1038 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST | |
1039 | */ | |
5262cbfb | 1040 | /* ARGSUSED */ |
510132b6 | 1041 | void |
1042 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) | |
1043 | { | |
1044 | Authctxt *authctxt = ctxt; | |
1045 | char *info, *lang, *password = NULL, *retype = NULL; | |
1046 | char prompt[150]; | |
1047 | ||
1048 | debug2("input_userauth_passwd_changereq"); | |
1049 | ||
1050 | if (authctxt == NULL) | |
1051 | fatal("input_userauth_passwd_changereq: " | |
1052 | "no authentication context"); | |
1053 | ||
1054 | info = packet_get_string(NULL); | |
1055 | lang = packet_get_string(NULL); | |
1056 | if (strlen(info) > 0) | |
7cac2b65 | 1057 | logit("%s", info); |
510132b6 | 1058 | xfree(info); |
1059 | xfree(lang); | |
1060 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1061 | packet_put_cstring(authctxt->server_user); | |
1062 | packet_put_cstring(authctxt->service); | |
1063 | packet_put_cstring(authctxt->method->name); | |
1064 | packet_put_char(1); /* additional info */ | |
44a053a3 | 1065 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1066 | "Enter %.30s@%.128s's old password: ", |
1067 | authctxt->server_user, authctxt->host); | |
1068 | password = read_passphrase(prompt, 0); | |
1069 | packet_put_cstring(password); | |
1070 | memset(password, 0, strlen(password)); | |
1071 | xfree(password); | |
1072 | password = NULL; | |
1073 | while (password == NULL) { | |
44a053a3 | 1074 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1075 | "Enter %.30s@%.128s's new password: ", |
1076 | authctxt->server_user, authctxt->host); | |
1077 | password = read_passphrase(prompt, RP_ALLOW_EOF); | |
1078 | if (password == NULL) { | |
1079 | /* bail out */ | |
1080 | return; | |
1081 | } | |
44a053a3 | 1082 | snprintf(prompt, sizeof(prompt), |
510132b6 | 1083 | "Retype %.30s@%.128s's new password: ", |
1084 | authctxt->server_user, authctxt->host); | |
1085 | retype = read_passphrase(prompt, 0); | |
1086 | if (strcmp(password, retype) != 0) { | |
1087 | memset(password, 0, strlen(password)); | |
1088 | xfree(password); | |
7cac2b65 | 1089 | logit("Mismatch; try again, EOF to quit."); |
510132b6 | 1090 | password = NULL; |
1091 | } | |
1092 | memset(retype, 0, strlen(retype)); | |
1093 | xfree(retype); | |
1094 | } | |
1095 | packet_put_cstring(password); | |
1096 | memset(password, 0, strlen(password)); | |
1097 | xfree(password); | |
1098 | packet_add_padding(64); | |
1099 | packet_send(); | |
44a053a3 | 1100 | |
1101 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, | |
510132b6 | 1102 | &input_userauth_passwd_changereq); |
1103 | } | |
3c0ef626 | 1104 | |
5262cbfb | 1105 | #ifdef JPAKE |
1106 | static char * | |
1107 | pw_encrypt(const char *password, const char *crypt_scheme, const char *salt) | |
1108 | { | |
1109 | /* OpenBSD crypt(3) handles all of these */ | |
1110 | if (strcmp(crypt_scheme, "crypt") == 0 || | |
1111 | strcmp(crypt_scheme, "bcrypt") == 0 || | |
1112 | strcmp(crypt_scheme, "md5crypt") == 0 || | |
1113 | strcmp(crypt_scheme, "crypt-extended") == 0) | |
1114 | return xstrdup(crypt(password, salt)); | |
1115 | error("%s: unsupported password encryption scheme \"%.100s\"", | |
1116 | __func__, crypt_scheme); | |
1117 | return NULL; | |
1118 | } | |
1119 | ||
1120 | static BIGNUM * | |
1121 | jpake_password_to_secret(Authctxt *authctxt, const char *crypt_scheme, | |
1122 | const char *salt) | |
1123 | { | |
1124 | char prompt[256], *password, *crypted; | |
1125 | u_char *secret; | |
1126 | u_int secret_len; | |
1127 | BIGNUM *ret; | |
1128 | ||
1129 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password (JPAKE): ", | |
1130 | authctxt->server_user, authctxt->host); | |
1131 | password = read_passphrase(prompt, 0); | |
1132 | ||
1133 | if ((crypted = pw_encrypt(password, crypt_scheme, salt)) == NULL) { | |
1134 | logit("Disabling %s authentication", authctxt->method->name); | |
1135 | authctxt->method->enabled = NULL; | |
1136 | /* Continue with an empty password to fail gracefully */ | |
1137 | crypted = xstrdup(""); | |
1138 | } | |
1139 | ||
1140 | #ifdef JPAKE_DEBUG | |
1141 | debug3("%s: salt = %s", __func__, salt); | |
1142 | debug3("%s: scheme = %s", __func__, crypt_scheme); | |
1143 | debug3("%s: crypted = %s", __func__, crypted); | |
1144 | #endif | |
1145 | ||
1146 | if (hash_buffer(crypted, strlen(crypted), EVP_sha256(), | |
1147 | &secret, &secret_len) != 0) | |
1148 | fatal("%s: hash_buffer", __func__); | |
1149 | ||
1150 | bzero(password, strlen(password)); | |
1151 | bzero(crypted, strlen(crypted)); | |
1152 | xfree(password); | |
1153 | xfree(crypted); | |
1154 | ||
1155 | if ((ret = BN_bin2bn(secret, secret_len, NULL)) == NULL) | |
1156 | fatal("%s: BN_bin2bn (secret)", __func__); | |
1157 | bzero(secret, secret_len); | |
1158 | xfree(secret); | |
1159 | ||
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /* ARGSUSED */ | |
1164 | void | |
1165 | input_userauth_jpake_server_step1(int type, u_int32_t seq, void *ctxt) | |
1166 | { | |
1167 | Authctxt *authctxt = ctxt; | |
1168 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1169 | u_char *x3_proof, *x4_proof, *x2_s_proof; | |
1170 | u_int x3_proof_len, x4_proof_len, x2_s_proof_len; | |
1171 | char *crypt_scheme, *salt; | |
1172 | ||
1173 | /* Disable this message */ | |
1174 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, NULL); | |
1175 | ||
1176 | if ((pctx->g_x3 = BN_new()) == NULL || | |
1177 | (pctx->g_x4 = BN_new()) == NULL) | |
1178 | fatal("%s: BN_new", __func__); | |
1179 | ||
1180 | /* Fetch step 1 values */ | |
1181 | crypt_scheme = packet_get_string(NULL); | |
1182 | salt = packet_get_string(NULL); | |
1183 | pctx->server_id = packet_get_string(&pctx->server_id_len); | |
1184 | packet_get_bignum2(pctx->g_x3); | |
1185 | packet_get_bignum2(pctx->g_x4); | |
1186 | x3_proof = packet_get_string(&x3_proof_len); | |
1187 | x4_proof = packet_get_string(&x4_proof_len); | |
1188 | packet_check_eom(); | |
1189 | ||
1190 | JPAKE_DEBUG_CTX((pctx, "step 1 received in %s", __func__)); | |
1191 | ||
1192 | /* Obtain password and derive secret */ | |
1193 | pctx->s = jpake_password_to_secret(authctxt, crypt_scheme, salt); | |
1194 | bzero(crypt_scheme, strlen(crypt_scheme)); | |
1195 | bzero(salt, strlen(salt)); | |
1196 | xfree(crypt_scheme); | |
1197 | xfree(salt); | |
1198 | JPAKE_DEBUG_BN((pctx->s, "%s: s = ", __func__)); | |
1199 | ||
1200 | /* Calculate step 2 values */ | |
1201 | jpake_step2(pctx->grp, pctx->s, pctx->g_x1, | |
1202 | pctx->g_x3, pctx->g_x4, pctx->x2, | |
1203 | pctx->server_id, pctx->server_id_len, | |
1204 | pctx->client_id, pctx->client_id_len, | |
1205 | x3_proof, x3_proof_len, | |
1206 | x4_proof, x4_proof_len, | |
1207 | &pctx->a, | |
1208 | &x2_s_proof, &x2_s_proof_len); | |
1209 | ||
1210 | bzero(x3_proof, x3_proof_len); | |
1211 | bzero(x4_proof, x4_proof_len); | |
1212 | xfree(x3_proof); | |
1213 | xfree(x4_proof); | |
1214 | ||
1215 | JPAKE_DEBUG_CTX((pctx, "step 2 sending in %s", __func__)); | |
1216 | ||
1217 | /* Send values for step 2 */ | |
1218 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP2); | |
1219 | packet_put_bignum2(pctx->a); | |
1220 | packet_put_string(x2_s_proof, x2_s_proof_len); | |
1221 | packet_send(); | |
1222 | ||
1223 | bzero(x2_s_proof, x2_s_proof_len); | |
1224 | xfree(x2_s_proof); | |
1225 | ||
1226 | /* Expect step 2 packet from peer */ | |
1227 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, | |
1228 | input_userauth_jpake_server_step2); | |
1229 | } | |
1230 | ||
1231 | /* ARGSUSED */ | |
1232 | void | |
1233 | input_userauth_jpake_server_step2(int type, u_int32_t seq, void *ctxt) | |
1234 | { | |
1235 | Authctxt *authctxt = ctxt; | |
1236 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1237 | u_char *x4_s_proof; | |
1238 | u_int x4_s_proof_len; | |
1239 | ||
1240 | /* Disable this message */ | |
1241 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, NULL); | |
1242 | ||
1243 | if ((pctx->b = BN_new()) == NULL) | |
1244 | fatal("%s: BN_new", __func__); | |
1245 | ||
1246 | /* Fetch step 2 values */ | |
1247 | packet_get_bignum2(pctx->b); | |
1248 | x4_s_proof = packet_get_string(&x4_s_proof_len); | |
1249 | packet_check_eom(); | |
1250 | ||
1251 | JPAKE_DEBUG_CTX((pctx, "step 2 received in %s", __func__)); | |
1252 | ||
1253 | /* Derive shared key and calculate confirmation hash */ | |
1254 | jpake_key_confirm(pctx->grp, pctx->s, pctx->b, | |
1255 | pctx->x2, pctx->g_x1, pctx->g_x2, pctx->g_x3, pctx->g_x4, | |
1256 | pctx->client_id, pctx->client_id_len, | |
1257 | pctx->server_id, pctx->server_id_len, | |
1258 | session_id2, session_id2_len, | |
1259 | x4_s_proof, x4_s_proof_len, | |
1260 | &pctx->k, | |
1261 | &pctx->h_k_cid_sessid, &pctx->h_k_cid_sessid_len); | |
1262 | ||
1263 | bzero(x4_s_proof, x4_s_proof_len); | |
1264 | xfree(x4_s_proof); | |
1265 | ||
1266 | JPAKE_DEBUG_CTX((pctx, "confirm sending in %s", __func__)); | |
1267 | ||
1268 | /* Send key confirmation proof */ | |
1269 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_CONFIRM); | |
1270 | packet_put_string(pctx->h_k_cid_sessid, pctx->h_k_cid_sessid_len); | |
1271 | packet_send(); | |
1272 | ||
1273 | /* Expect confirmation from peer */ | |
1274 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, | |
1275 | input_userauth_jpake_server_confirm); | |
1276 | } | |
1277 | ||
1278 | /* ARGSUSED */ | |
1279 | void | |
1280 | input_userauth_jpake_server_confirm(int type, u_int32_t seq, void *ctxt) | |
1281 | { | |
1282 | Authctxt *authctxt = ctxt; | |
1283 | struct jpake_ctx *pctx = authctxt->methoddata; | |
1284 | ||
1285 | /* Disable this message */ | |
1286 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, NULL); | |
1287 | ||
1288 | pctx->h_k_sid_sessid = packet_get_string(&pctx->h_k_sid_sessid_len); | |
1289 | packet_check_eom(); | |
1290 | ||
1291 | JPAKE_DEBUG_CTX((pctx, "confirm received in %s", __func__)); | |
1292 | ||
1293 | /* Verify expected confirmation hash */ | |
1294 | if (jpake_check_confirm(pctx->k, | |
1295 | pctx->server_id, pctx->server_id_len, | |
1296 | session_id2, session_id2_len, | |
1297 | pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len) == 1) | |
1298 | debug("%s: %s success", __func__, authctxt->method->name); | |
1299 | else { | |
1300 | debug("%s: confirmation mismatch", __func__); | |
1301 | /* XXX stash this so if auth succeeds then we can warn/kill */ | |
1302 | } | |
1303 | ||
1304 | userauth_jpake_cleanup(authctxt); | |
1305 | } | |
1306 | #endif /* JPAKE */ | |
1307 | ||
7cac2b65 | 1308 | static int |
1309 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, | |
1310 | u_char *data, u_int datalen) | |
3c0ef626 | 1311 | { |
7cac2b65 | 1312 | Key *prv; |
1313 | int ret; | |
1314 | ||
1315 | /* the agent supports this key */ | |
1316 | if (id->ac) | |
1317 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, | |
1318 | data, datalen)); | |
1319 | /* | |
1320 | * we have already loaded the private key or | |
1321 | * the private key is stored in external hardware | |
1322 | */ | |
1323 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) | |
1324 | return (key_sign(id->key, sigp, lenp, data, datalen)); | |
1325 | /* load the private key from the file */ | |
1326 | if ((prv = load_identity_file(id->filename)) == NULL) | |
1327 | return (-1); | |
1328 | ret = key_sign(prv, sigp, lenp, data, datalen); | |
1329 | key_free(prv); | |
1330 | return (ret); | |
3c0ef626 | 1331 | } |
1332 | ||
1333 | static int | |
7cac2b65 | 1334 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1335 | { |
1336 | Buffer b; | |
1337 | u_char *blob, *signature; | |
1e608e42 | 1338 | u_int bloblen, slen; |
7cac2b65 | 1339 | u_int skip = 0; |
3c0ef626 | 1340 | int ret = -1; |
1341 | int have_sig = 1; | |
1342 | ||
1343 | debug3("sign_and_send_pubkey"); | |
1344 | ||
7cac2b65 | 1345 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1346 | /* we cannot handle this key */ |
1347 | debug3("sign_and_send_pubkey: cannot handle key"); | |
1348 | return 0; | |
1349 | } | |
1350 | /* data to be signed */ | |
1351 | buffer_init(&b); | |
1352 | if (datafellows & SSH_OLD_SESSIONID) { | |
1353 | buffer_append(&b, session_id2, session_id2_len); | |
1354 | skip = session_id2_len; | |
1355 | } else { | |
1356 | buffer_put_string(&b, session_id2, session_id2_len); | |
1357 | skip = buffer_len(&b); | |
1358 | } | |
1359 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1360 | buffer_put_cstring(&b, authctxt->server_user); | |
1361 | buffer_put_cstring(&b, | |
1362 | datafellows & SSH_BUG_PKSERVICE ? | |
1363 | "ssh-userauth" : | |
1364 | authctxt->service); | |
1365 | if (datafellows & SSH_BUG_PKAUTH) { | |
1366 | buffer_put_char(&b, have_sig); | |
1367 | } else { | |
1368 | buffer_put_cstring(&b, authctxt->method->name); | |
1369 | buffer_put_char(&b, have_sig); | |
7cac2b65 | 1370 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 1371 | } |
1372 | buffer_put_string(&b, blob, bloblen); | |
1373 | ||
1374 | /* generate signature */ | |
7cac2b65 | 1375 | ret = identity_sign(id, &signature, &slen, |
3c0ef626 | 1376 | buffer_ptr(&b), buffer_len(&b)); |
1377 | if (ret == -1) { | |
1378 | xfree(blob); | |
1379 | buffer_free(&b); | |
1380 | return 0; | |
1381 | } | |
1382 | #ifdef DEBUG_PK | |
1383 | buffer_dump(&b); | |
1384 | #endif | |
1385 | if (datafellows & SSH_BUG_PKSERVICE) { | |
1386 | buffer_clear(&b); | |
1387 | buffer_append(&b, session_id2, session_id2_len); | |
1388 | skip = session_id2_len; | |
1389 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1390 | buffer_put_cstring(&b, authctxt->server_user); | |
1391 | buffer_put_cstring(&b, authctxt->service); | |
1392 | buffer_put_cstring(&b, authctxt->method->name); | |
1393 | buffer_put_char(&b, have_sig); | |
1394 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 1395 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
3c0ef626 | 1396 | buffer_put_string(&b, blob, bloblen); |
1397 | } | |
1398 | xfree(blob); | |
1399 | ||
1400 | /* append signature */ | |
1401 | buffer_put_string(&b, signature, slen); | |
1402 | xfree(signature); | |
1403 | ||
1404 | /* skip session id and packet type */ | |
1405 | if (buffer_len(&b) < skip + 1) | |
1406 | fatal("userauth_pubkey: internal error"); | |
1407 | buffer_consume(&b, skip + 1); | |
1408 | ||
1409 | /* put remaining data from buffer into packet */ | |
1410 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1411 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
1412 | buffer_free(&b); | |
1413 | packet_send(); | |
1414 | ||
1415 | return 1; | |
1416 | } | |
1417 | ||
1418 | static int | |
7cac2b65 | 1419 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
3c0ef626 | 1420 | { |
1421 | u_char *blob; | |
1e608e42 | 1422 | u_int bloblen, have_sig = 0; |
3c0ef626 | 1423 | |
1424 | debug3("send_pubkey_test"); | |
1425 | ||
7cac2b65 | 1426 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
3c0ef626 | 1427 | /* we cannot handle this key */ |
1428 | debug3("send_pubkey_test: cannot handle key"); | |
1429 | return 0; | |
1430 | } | |
1431 | /* register callback for USERAUTH_PK_OK message */ | |
3c0ef626 | 1432 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
1433 | ||
1434 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1435 | packet_put_cstring(authctxt->server_user); | |
1436 | packet_put_cstring(authctxt->service); | |
1437 | packet_put_cstring(authctxt->method->name); | |
1438 | packet_put_char(have_sig); | |
1439 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
7cac2b65 | 1440 | packet_put_cstring(key_ssh_name(id->key)); |
3c0ef626 | 1441 | packet_put_string(blob, bloblen); |
1442 | xfree(blob); | |
1443 | packet_send(); | |
1444 | return 1; | |
1445 | } | |
1446 | ||
1447 | static Key * | |
1448 | load_identity_file(char *filename) | |
1449 | { | |
1450 | Key *private; | |
1451 | char prompt[300], *passphrase; | |
30460aeb | 1452 | int perm_ok, quit, i; |
3c0ef626 | 1453 | struct stat st; |
1454 | ||
1455 | if (stat(filename, &st) < 0) { | |
1456 | debug3("no such identity: %s", filename); | |
1457 | return NULL; | |
1458 | } | |
30460aeb | 1459 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok); |
1460 | if (!perm_ok) | |
1461 | return NULL; | |
3c0ef626 | 1462 | if (private == NULL) { |
1463 | if (options.batch_mode) | |
1464 | return NULL; | |
1465 | snprintf(prompt, sizeof prompt, | |
1e608e42 | 1466 | "Enter passphrase for key '%.100s': ", filename); |
3c0ef626 | 1467 | for (i = 0; i < options.number_of_password_prompts; i++) { |
1468 | passphrase = read_passphrase(prompt, 0); | |
1469 | if (strcmp(passphrase, "") != 0) { | |
30460aeb | 1470 | private = key_load_private_type(KEY_UNSPEC, |
1471 | filename, passphrase, NULL, NULL); | |
3c0ef626 | 1472 | quit = 0; |
1473 | } else { | |
1474 | debug2("no passphrase given, try next key"); | |
1475 | quit = 1; | |
1476 | } | |
1477 | memset(passphrase, 0, strlen(passphrase)); | |
1478 | xfree(passphrase); | |
1479 | if (private != NULL || quit) | |
1480 | break; | |
1481 | debug2("bad passphrase given, try again..."); | |
1482 | } | |
1483 | } | |
1484 | return private; | |
1485 | } | |
1486 | ||
7cac2b65 | 1487 | /* |
1488 | * try keys in the following order: | |
1489 | * 1. agent keys that are found in the config file | |
1490 | * 2. other agent keys | |
1491 | * 3. keys that are only listed in the config file | |
1492 | */ | |
1493 | static void | |
1494 | pubkey_prepare(Authctxt *authctxt) | |
3c0ef626 | 1495 | { |
7cac2b65 | 1496 | Identity *id; |
1497 | Idlist agent, files, *preferred; | |
1498 | Key *key; | |
1499 | AuthenticationConnection *ac; | |
1500 | char *comment; | |
1501 | int i, found; | |
1502 | ||
1503 | TAILQ_INIT(&agent); /* keys from the agent */ | |
1504 | TAILQ_INIT(&files); /* keys from the config file */ | |
1505 | preferred = &authctxt->keys; | |
1506 | TAILQ_INIT(preferred); /* preferred order of keys */ | |
1507 | ||
1508 | /* list of keys stored in the filesystem */ | |
1509 | for (i = 0; i < options.num_identity_files; i++) { | |
1510 | key = options.identity_keys[i]; | |
1511 | if (key && key->type == KEY_RSA1) | |
1512 | continue; | |
1513 | options.identity_keys[i] = NULL; | |
30460aeb | 1514 | id = xcalloc(1, sizeof(*id)); |
7cac2b65 | 1515 | id->key = key; |
1516 | id->filename = xstrdup(options.identity_files[i]); | |
1517 | TAILQ_INSERT_TAIL(&files, id, next); | |
1518 | } | |
1519 | /* list of keys supported by the agent */ | |
1520 | if ((ac = ssh_get_authentication_connection())) { | |
1521 | for (key = ssh_get_first_identity(ac, &comment, 2); | |
1522 | key != NULL; | |
1523 | key = ssh_get_next_identity(ac, &comment, 2)) { | |
1524 | found = 0; | |
1525 | TAILQ_FOREACH(id, &files, next) { | |
540d72c3 | 1526 | /* agent keys from the config file are preferred */ |
7cac2b65 | 1527 | if (key_equal(key, id->key)) { |
1528 | key_free(key); | |
1529 | xfree(comment); | |
1530 | TAILQ_REMOVE(&files, id, next); | |
1531 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1532 | id->ac = ac; | |
1533 | found = 1; | |
1534 | break; | |
1535 | } | |
1536 | } | |
12a403af | 1537 | if (!found && !options.identities_only) { |
30460aeb | 1538 | id = xcalloc(1, sizeof(*id)); |
7cac2b65 | 1539 | id->key = key; |
1540 | id->filename = comment; | |
1541 | id->ac = ac; | |
1542 | TAILQ_INSERT_TAIL(&agent, id, next); | |
1543 | } | |
1544 | } | |
1545 | /* append remaining agent keys */ | |
1546 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { | |
1547 | TAILQ_REMOVE(&agent, id, next); | |
1548 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1549 | } | |
1550 | authctxt->agent = ac; | |
1551 | } | |
1552 | /* append remaining keys from the config file */ | |
1553 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { | |
1554 | TAILQ_REMOVE(&files, id, next); | |
1555 | TAILQ_INSERT_TAIL(preferred, id, next); | |
1556 | } | |
1557 | TAILQ_FOREACH(id, preferred, next) { | |
1558 | debug2("key: %s (%p)", id->filename, id->key); | |
1559 | } | |
3c0ef626 | 1560 | } |
1561 | ||
7cac2b65 | 1562 | static void |
1563 | pubkey_cleanup(Authctxt *authctxt) | |
3c0ef626 | 1564 | { |
7cac2b65 | 1565 | Identity *id; |
1566 | ||
1567 | if (authctxt->agent != NULL) | |
1568 | ssh_close_authentication_connection(authctxt->agent); | |
1569 | for (id = TAILQ_FIRST(&authctxt->keys); id; | |
1570 | id = TAILQ_FIRST(&authctxt->keys)) { | |
1571 | TAILQ_REMOVE(&authctxt->keys, id, next); | |
1572 | if (id->key) | |
1573 | key_free(id->key); | |
1574 | if (id->filename) | |
1575 | xfree(id->filename); | |
1576 | xfree(id); | |
3c0ef626 | 1577 | } |
3c0ef626 | 1578 | } |
1579 | ||
1580 | int | |
1581 | userauth_pubkey(Authctxt *authctxt) | |
1582 | { | |
7cac2b65 | 1583 | Identity *id; |
3c0ef626 | 1584 | int sent = 0; |
3c0ef626 | 1585 | |
7cac2b65 | 1586 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
1587 | if (id->tried++) | |
1588 | return (0); | |
540d72c3 | 1589 | /* move key to the end of the queue */ |
7cac2b65 | 1590 | TAILQ_REMOVE(&authctxt->keys, id, next); |
1591 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); | |
1592 | /* | |
1593 | * send a test message if we have the public key. for | |
1594 | * encrypted keys we cannot do this and have to load the | |
1595 | * private key instead | |
1596 | */ | |
1597 | if (id->key && id->key->type != KEY_RSA1) { | |
1598 | debug("Offering public key: %s", id->filename); | |
1599 | sent = send_pubkey_test(authctxt, id); | |
1600 | } else if (id->key == NULL) { | |
1601 | debug("Trying private key: %s", id->filename); | |
1602 | id->key = load_identity_file(id->filename); | |
1603 | if (id->key != NULL) { | |
1604 | id->isprivate = 1; | |
1605 | sent = sign_and_send_pubkey(authctxt, id); | |
1606 | key_free(id->key); | |
1607 | id->key = NULL; | |
3c0ef626 | 1608 | } |
3c0ef626 | 1609 | } |
7cac2b65 | 1610 | if (sent) |
1611 | return (sent); | |
3c0ef626 | 1612 | } |
7cac2b65 | 1613 | return (0); |
3c0ef626 | 1614 | } |
1615 | ||
1616 | /* | |
1617 | * Send userauth request message specifying keyboard-interactive method. | |
1618 | */ | |
1619 | int | |
1620 | userauth_kbdint(Authctxt *authctxt) | |
1621 | { | |
1622 | static int attempt = 0; | |
1623 | ||
1624 | if (attempt++ >= options.number_of_password_prompts) | |
1625 | return 0; | |
1626 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ | |
1627 | if (attempt > 1 && !authctxt->info_req_seen) { | |
1628 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
1629 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | debug2("userauth_kbdint"); | |
1634 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1635 | packet_put_cstring(authctxt->server_user); | |
1636 | packet_put_cstring(authctxt->service); | |
1637 | packet_put_cstring(authctxt->method->name); | |
1638 | packet_put_cstring(""); /* lang */ | |
1639 | packet_put_cstring(options.kbd_interactive_devices ? | |
1640 | options.kbd_interactive_devices : ""); | |
1641 | packet_send(); | |
1642 | ||
1643 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
1644 | return 1; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE | |
1649 | */ | |
1650 | void | |
1e608e42 | 1651 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1652 | { |
1653 | Authctxt *authctxt = ctxt; | |
1654 | char *name, *inst, *lang, *prompt, *response; | |
1655 | u_int num_prompts, i; | |
1656 | int echo = 0; | |
1657 | ||
1658 | debug2("input_userauth_info_req"); | |
1659 | ||
1660 | if (authctxt == NULL) | |
1661 | fatal("input_userauth_info_req: no authentication context"); | |
1662 | ||
1663 | authctxt->info_req_seen = 1; | |
1664 | ||
1665 | name = packet_get_string(NULL); | |
1666 | inst = packet_get_string(NULL); | |
1667 | lang = packet_get_string(NULL); | |
1668 | if (strlen(name) > 0) | |
7cac2b65 | 1669 | logit("%s", name); |
3c0ef626 | 1670 | if (strlen(inst) > 0) |
7cac2b65 | 1671 | logit("%s", inst); |
3c0ef626 | 1672 | xfree(name); |
1673 | xfree(inst); | |
1674 | xfree(lang); | |
1675 | ||
1676 | num_prompts = packet_get_int(); | |
1677 | /* | |
1678 | * Begin to build info response packet based on prompts requested. | |
1679 | * We commit to providing the correct number of responses, so if | |
1680 | * further on we run into a problem that prevents this, we have to | |
1681 | * be sure and clean this up and send a correct error response. | |
1682 | */ | |
1683 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
1684 | packet_put_int(num_prompts); | |
1685 | ||
1686 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); | |
1687 | for (i = 0; i < num_prompts; i++) { | |
1688 | prompt = packet_get_string(NULL); | |
1689 | echo = packet_get_char(); | |
1690 | ||
1691 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); | |
1692 | ||
1693 | packet_put_cstring(response); | |
1694 | memset(response, 0, strlen(response)); | |
1695 | xfree(response); | |
1696 | xfree(prompt); | |
1697 | } | |
1e608e42 | 1698 | packet_check_eom(); /* done with parsing incoming message. */ |
3c0ef626 | 1699 | |
1700 | packet_add_padding(64); | |
1701 | packet_send(); | |
1702 | } | |
1703 | ||
44a053a3 | 1704 | static int |
276b07a3 | 1705 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
44a053a3 | 1706 | u_char *data, u_int datalen) |
1707 | { | |
1708 | Buffer b; | |
1709 | struct stat st; | |
1710 | pid_t pid; | |
1711 | int to[2], from[2], status, version = 2; | |
1712 | ||
bfe49944 | 1713 | debug2("ssh_keysign called"); |
44a053a3 | 1714 | |
1715 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { | |
1716 | error("ssh_keysign: no installed: %s", strerror(errno)); | |
1717 | return -1; | |
1718 | } | |
1719 | if (fflush(stdout) != 0) | |
1720 | error("ssh_keysign: fflush: %s", strerror(errno)); | |
1721 | if (pipe(to) < 0) { | |
1722 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1723 | return -1; | |
1724 | } | |
1725 | if (pipe(from) < 0) { | |
1726 | error("ssh_keysign: pipe: %s", strerror(errno)); | |
1727 | return -1; | |
1728 | } | |
1729 | if ((pid = fork()) < 0) { | |
1730 | error("ssh_keysign: fork: %s", strerror(errno)); | |
1731 | return -1; | |
1732 | } | |
1733 | if (pid == 0) { | |
30460aeb | 1734 | permanently_drop_suid(getuid()); |
44a053a3 | 1735 | close(from[0]); |
1736 | if (dup2(from[1], STDOUT_FILENO) < 0) | |
1737 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1738 | close(to[1]); | |
1739 | if (dup2(to[0], STDIN_FILENO) < 0) | |
1740 | fatal("ssh_keysign: dup2: %s", strerror(errno)); | |
1741 | close(from[1]); | |
1742 | close(to[0]); | |
1743 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); | |
1744 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, | |
1745 | strerror(errno)); | |
1746 | } | |
1747 | close(from[1]); | |
1748 | close(to[0]); | |
1749 | ||
1750 | buffer_init(&b); | |
1751 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ | |
1752 | buffer_put_string(&b, data, datalen); | |
540d72c3 | 1753 | if (ssh_msg_send(to[1], version, &b) == -1) |
1754 | fatal("ssh_keysign: couldn't send request"); | |
44a053a3 | 1755 | |
d03f4262 | 1756 | if (ssh_msg_recv(from[0], &b) < 0) { |
44a053a3 | 1757 | error("ssh_keysign: no reply"); |
540d72c3 | 1758 | buffer_free(&b); |
44a053a3 | 1759 | return -1; |
1760 | } | |
1761 | close(from[0]); | |
1762 | close(to[1]); | |
1763 | ||
1764 | while (waitpid(pid, &status, 0) < 0) | |
1765 | if (errno != EINTR) | |
1766 | break; | |
1767 | ||
1768 | if (buffer_get_char(&b) != version) { | |
1769 | error("ssh_keysign: bad version"); | |
540d72c3 | 1770 | buffer_free(&b); |
44a053a3 | 1771 | return -1; |
1772 | } | |
1773 | *sigp = buffer_get_string(&b, lenp); | |
540d72c3 | 1774 | buffer_free(&b); |
44a053a3 | 1775 | |
1776 | return 0; | |
1777 | } | |
1778 | ||
3c0ef626 | 1779 | int |
1780 | userauth_hostbased(Authctxt *authctxt) | |
1781 | { | |
1782 | Key *private = NULL; | |
44a053a3 | 1783 | Sensitive *sensitive = authctxt->sensitive; |
3c0ef626 | 1784 | Buffer b; |
1785 | u_char *signature, *blob; | |
fa0f0f45 | 1786 | char *chost, *pkalg, *p, myname[NI_MAXHOST]; |
3c0ef626 | 1787 | const char *service; |
1788 | u_int blen, slen; | |
1789 | int ok, i, len, found = 0; | |
1790 | ||
1791 | /* check for a useful key */ | |
44a053a3 | 1792 | for (i = 0; i < sensitive->nkeys; i++) { |
1793 | private = sensitive->keys[i]; | |
3c0ef626 | 1794 | if (private && private->type != KEY_RSA1) { |
1795 | found = 1; | |
1796 | /* we take and free the key */ | |
44a053a3 | 1797 | sensitive->keys[i] = NULL; |
3c0ef626 | 1798 | break; |
1799 | } | |
1800 | } | |
1801 | if (!found) { | |
bfe49944 | 1802 | debug("No more client hostkeys for hostbased authentication."); |
3c0ef626 | 1803 | return 0; |
1804 | } | |
1805 | if (key_to_blob(private, &blob, &blen) == 0) { | |
1806 | key_free(private); | |
1807 | return 0; | |
1808 | } | |
1809 | /* figure out a name for the client host */ | |
fa0f0f45 | 1810 | p = NULL; |
1811 | if (packet_connection_is_on_socket()) | |
1812 | p = get_local_name(packet_get_connection_in()); | |
1813 | if (p == NULL) { | |
1814 | if (gethostname(myname, sizeof(myname)) == -1) { | |
1815 | verbose("userauth_hostbased: gethostname: %s", | |
1816 | strerror(errno)); | |
1817 | } else | |
1818 | p = xstrdup(myname); | |
1819 | } | |
3c0ef626 | 1820 | if (p == NULL) { |
1821 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
1822 | key_free(private); | |
30460aeb | 1823 | xfree(blob); |
3c0ef626 | 1824 | return 0; |
1825 | } | |
1826 | len = strlen(p) + 2; | |
30460aeb | 1827 | xasprintf(&chost, "%s.", p); |
3c0ef626 | 1828 | debug2("userauth_hostbased: chost %s", chost); |
bfe49944 | 1829 | xfree(p); |
3c0ef626 | 1830 | |
1831 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : | |
1832 | authctxt->service; | |
1833 | pkalg = xstrdup(key_ssh_name(private)); | |
1834 | buffer_init(&b); | |
1835 | /* construct data */ | |
1836 | buffer_put_string(&b, session_id2, session_id2_len); | |
1837 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
1838 | buffer_put_cstring(&b, authctxt->server_user); | |
1839 | buffer_put_cstring(&b, service); | |
1840 | buffer_put_cstring(&b, authctxt->method->name); | |
1841 | buffer_put_cstring(&b, pkalg); | |
1842 | buffer_put_string(&b, blob, blen); | |
1843 | buffer_put_cstring(&b, chost); | |
1844 | buffer_put_cstring(&b, authctxt->local_user); | |
1845 | #ifdef DEBUG_PK | |
1846 | buffer_dump(&b); | |
1847 | #endif | |
44a053a3 | 1848 | if (sensitive->external_keysign) |
1849 | ok = ssh_keysign(private, &signature, &slen, | |
1850 | buffer_ptr(&b), buffer_len(&b)); | |
1851 | else | |
1852 | ok = key_sign(private, &signature, &slen, | |
1853 | buffer_ptr(&b), buffer_len(&b)); | |
3c0ef626 | 1854 | key_free(private); |
1855 | buffer_free(&b); | |
1856 | if (ok != 0) { | |
1857 | error("key_sign failed"); | |
1858 | xfree(chost); | |
1859 | xfree(pkalg); | |
30460aeb | 1860 | xfree(blob); |
3c0ef626 | 1861 | return 0; |
1862 | } | |
1863 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1864 | packet_put_cstring(authctxt->server_user); | |
1865 | packet_put_cstring(authctxt->service); | |
1866 | packet_put_cstring(authctxt->method->name); | |
1867 | packet_put_cstring(pkalg); | |
1868 | packet_put_string(blob, blen); | |
1869 | packet_put_cstring(chost); | |
1870 | packet_put_cstring(authctxt->local_user); | |
1871 | packet_put_string(signature, slen); | |
1872 | memset(signature, 's', slen); | |
1873 | xfree(signature); | |
1874 | xfree(chost); | |
1875 | xfree(pkalg); | |
30460aeb | 1876 | xfree(blob); |
3c0ef626 | 1877 | |
1878 | packet_send(); | |
1879 | return 1; | |
1880 | } | |
1881 | ||
5262cbfb | 1882 | #ifdef JPAKE |
1883 | int | |
1884 | userauth_jpake(Authctxt *authctxt) | |
1885 | { | |
1886 | struct jpake_ctx *pctx; | |
1887 | u_char *x1_proof, *x2_proof; | |
1888 | u_int x1_proof_len, x2_proof_len; | |
1889 | static int attempt = 0; /* XXX share with userauth_password's? */ | |
1890 | ||
1891 | if (attempt++ >= options.number_of_password_prompts) | |
1892 | return 0; | |
1893 | if (attempt != 1) | |
1894 | error("Permission denied, please try again."); | |
1895 | ||
1896 | if (authctxt->methoddata != NULL) | |
1897 | fatal("%s: authctxt->methoddata already set (%p)", | |
1898 | __func__, authctxt->methoddata); | |
1899 | ||
1900 | authctxt->methoddata = pctx = jpake_new(); | |
1901 | ||
1902 | /* | |
1903 | * Send request immediately, to get the protocol going while | |
1904 | * we do the initial computations. | |
1905 | */ | |
1906 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
1907 | packet_put_cstring(authctxt->server_user); | |
1908 | packet_put_cstring(authctxt->service); | |
1909 | packet_put_cstring(authctxt->method->name); | |
1910 | packet_send(); | |
1911 | packet_write_wait(); | |
1912 | ||
1913 | jpake_step1(pctx->grp, | |
1914 | &pctx->client_id, &pctx->client_id_len, | |
1915 | &pctx->x1, &pctx->x2, &pctx->g_x1, &pctx->g_x2, | |
1916 | &x1_proof, &x1_proof_len, | |
1917 | &x2_proof, &x2_proof_len); | |
1918 | ||
1919 | JPAKE_DEBUG_CTX((pctx, "step 1 sending in %s", __func__)); | |
1920 | ||
1921 | packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP1); | |
1922 | packet_put_string(pctx->client_id, pctx->client_id_len); | |
1923 | packet_put_bignum2(pctx->g_x1); | |
1924 | packet_put_bignum2(pctx->g_x2); | |
1925 | packet_put_string(x1_proof, x1_proof_len); | |
1926 | packet_put_string(x2_proof, x2_proof_len); | |
1927 | packet_send(); | |
1928 | ||
1929 | bzero(x1_proof, x1_proof_len); | |
1930 | bzero(x2_proof, x2_proof_len); | |
1931 | xfree(x1_proof); | |
1932 | xfree(x2_proof); | |
1933 | ||
1934 | /* Expect step 1 packet from peer */ | |
1935 | dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, | |
1936 | input_userauth_jpake_server_step1); | |
1937 | ||
1938 | return 1; | |
1939 | } | |
1940 | ||
1941 | void | |
1942 | userauth_jpake_cleanup(Authctxt *authctxt) | |
1943 | { | |
1944 | debug3("%s: clean up", __func__); | |
1945 | if (authctxt->methoddata != NULL) { | |
1946 | jpake_free(authctxt->methoddata); | |
1947 | authctxt->methoddata = NULL; | |
1948 | } | |
1949 | } | |
1950 | #endif /* JPAKE */ | |
1951 | ||
3c0ef626 | 1952 | /* find auth method */ |
1953 | ||
1954 | /* | |
1955 | * given auth method name, if configurable options permit this method fill | |
1956 | * in auth_ident field and return true, otherwise return false. | |
1957 | */ | |
1958 | static int | |
1959 | authmethod_is_enabled(Authmethod *method) | |
1960 | { | |
1961 | if (method == NULL) | |
1962 | return 0; | |
1963 | /* return false if options indicate this method is disabled */ | |
1964 | if (method->enabled == NULL || *method->enabled == 0) | |
1965 | return 0; | |
1966 | /* return false if batch mode is enabled but method needs interactive mode */ | |
1967 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
1968 | return 0; | |
1969 | return 1; | |
1970 | } | |
1971 | ||
1972 | static Authmethod * | |
1973 | authmethod_lookup(const char *name) | |
1974 | { | |
1975 | Authmethod *method = NULL; | |
1976 | if (name != NULL) | |
1977 | for (method = authmethods; method->name != NULL; method++) | |
1978 | if (strcmp(name, method->name) == 0) | |
1979 | return method; | |
1980 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
1981 | return NULL; | |
1982 | } | |
1983 | ||
1984 | /* XXX internal state */ | |
1985 | static Authmethod *current = NULL; | |
1986 | static char *supported = NULL; | |
1987 | static char *preferred = NULL; | |
276b07a3 | 1988 | |
3c0ef626 | 1989 | /* |
1990 | * Given the authentication method list sent by the server, return the | |
1991 | * next method we should try. If the server initially sends a nil list, | |
1992 | * use a built-in default list. | |
1993 | */ | |
1994 | static Authmethod * | |
1995 | authmethod_get(char *authlist) | |
1996 | { | |
3c0ef626 | 1997 | char *name = NULL; |
1e608e42 | 1998 | u_int next; |
3c0ef626 | 1999 | |
2000 | /* Use a suitable default if we're passed a nil list. */ | |
2001 | if (authlist == NULL || strlen(authlist) == 0) | |
2002 | authlist = options.preferred_authentications; | |
2003 | ||
2004 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
2005 | debug3("start over, passed a different list %s", authlist); | |
2006 | if (supported != NULL) | |
2007 | xfree(supported); | |
2008 | supported = xstrdup(authlist); | |
2009 | preferred = options.preferred_authentications; | |
2010 | debug3("preferred %s", preferred); | |
2011 | current = NULL; | |
2012 | } else if (current != NULL && authmethod_is_enabled(current)) | |
2013 | return current; | |
2014 | ||
2015 | for (;;) { | |
2016 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
bfe49944 | 2017 | debug("No more authentication methods to try."); |
3c0ef626 | 2018 | current = NULL; |
2019 | return NULL; | |
2020 | } | |
2021 | preferred += next; | |
2022 | debug3("authmethod_lookup %s", name); | |
2023 | debug3("remaining preferred: %s", preferred); | |
2024 | if ((current = authmethod_lookup(name)) != NULL && | |
2025 | authmethod_is_enabled(current)) { | |
2026 | debug3("authmethod_is_enabled %s", name); | |
bfe49944 | 2027 | debug("Next authentication method: %s", name); |
3c0ef626 | 2028 | return current; |
2029 | } | |
2030 | } | |
2031 | } | |
2032 | ||
3c0ef626 | 2033 | static char * |
2034 | authmethods_get(void) | |
2035 | { | |
2036 | Authmethod *method = NULL; | |
1e608e42 | 2037 | Buffer b; |
2038 | char *list; | |
3c0ef626 | 2039 | |
1e608e42 | 2040 | buffer_init(&b); |
3c0ef626 | 2041 | for (method = authmethods; method->name != NULL; method++) { |
2042 | if (authmethod_is_enabled(method)) { | |
1e608e42 | 2043 | if (buffer_len(&b) > 0) |
2044 | buffer_append(&b, ",", 1); | |
2045 | buffer_append(&b, method->name, strlen(method->name)); | |
3c0ef626 | 2046 | } |
2047 | } | |
1e608e42 | 2048 | buffer_append(&b, "\0", 1); |
2049 | list = xstrdup(buffer_ptr(&b)); | |
2050 | buffer_free(&b); | |
2051 | return list; | |
3c0ef626 | 2052 | } |
5262cbfb | 2053 |