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1 | /*- | |
2 | * Copyright (c) 2002 Networks Associates Technology, Inc. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This software was developed for the FreeBSD Project by ThinkSec AS and | |
6 | * NAI Labs, the Security Research Division of Network Associates, Inc. | |
7 | * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the | |
8 | * DARPA CHATS research program. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
29 | * SUCH DAMAGE. | |
30 | */ | |
31 | ||
32 | /* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */ | |
33 | #include "includes.h" | |
34 | RCSID("$Id$"); | |
35 | ||
36 | #ifdef USE_PAM | |
37 | #include <security/pam_appl.h> | |
38 | ||
39 | #include "auth.h" | |
40 | #include "auth-pam.h" | |
41 | #include "buffer.h" | |
42 | #include "bufaux.h" | |
43 | #include "canohost.h" | |
44 | #include "log.h" | |
45 | #include "monitor_wrap.h" | |
46 | #include "msg.h" | |
47 | #include "packet.h" | |
48 | #include "readpass.h" | |
49 | #include "servconf.h" | |
50 | #include "ssh2.h" | |
51 | #include "xmalloc.h" | |
52 | ||
53 | extern ServerOptions options; | |
54 | ||
55 | #define __unused | |
56 | ||
57 | #ifdef USE_POSIX_THREADS | |
58 | #include <pthread.h> | |
59 | /* | |
60 | * Avoid namespace clash when *not* using pthreads for systems *with* | |
61 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
62 | * (e.g. Linux) | |
63 | */ | |
64 | typedef pthread_t sp_pthread_t; | |
65 | #else | |
66 | /* | |
67 | * Simulate threads with processes. | |
68 | */ | |
69 | typedef pid_t sp_pthread_t; | |
70 | ||
71 | static void | |
72 | pthread_exit(void *value __unused) | |
73 | { | |
74 | _exit(0); | |
75 | } | |
76 | ||
77 | static int | |
78 | pthread_create(sp_pthread_t *thread, const void *attr __unused, | |
79 | void *(*thread_start)(void *), void *arg) | |
80 | { | |
81 | pid_t pid; | |
82 | ||
83 | switch ((pid = fork())) { | |
84 | case -1: | |
85 | error("fork(): %s", strerror(errno)); | |
86 | return (-1); | |
87 | case 0: | |
88 | thread_start(arg); | |
89 | _exit(1); | |
90 | default: | |
91 | *thread = pid; | |
92 | return (0); | |
93 | } | |
94 | } | |
95 | ||
96 | static int | |
97 | pthread_cancel(sp_pthread_t thread) | |
98 | { | |
99 | return (kill(thread, SIGTERM)); | |
100 | } | |
101 | ||
102 | static int | |
103 | pthread_join(sp_pthread_t thread, void **value __unused) | |
104 | { | |
105 | int status; | |
106 | ||
107 | waitpid(thread, &status, 0); | |
108 | return (status); | |
109 | } | |
110 | #endif | |
111 | ||
112 | ||
113 | static pam_handle_t *sshpam_handle; | |
114 | static int sshpam_err; | |
115 | static int sshpam_authenticated; | |
116 | static int sshpam_new_authtok_reqd; | |
117 | static int sshpam_session_open; | |
118 | static int sshpam_cred_established; | |
119 | ||
120 | struct pam_ctxt { | |
121 | sp_pthread_t pam_thread; | |
122 | int pam_psock; | |
123 | int pam_csock; | |
124 | int pam_done; | |
125 | }; | |
126 | ||
127 | static void sshpam_free_ctx(void *); | |
128 | ||
129 | /* | |
130 | * Conversation function for authentication thread. | |
131 | */ | |
132 | static int | |
133 | sshpam_thread_conv(int n, | |
134 | const struct pam_message **msg, | |
135 | struct pam_response **resp, | |
136 | void *data) | |
137 | { | |
138 | Buffer buffer; | |
139 | struct pam_ctxt *ctxt; | |
140 | int i; | |
141 | ||
142 | ctxt = data; | |
143 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
144 | return (PAM_CONV_ERR); | |
145 | *resp = xmalloc(n * sizeof **resp); | |
146 | buffer_init(&buffer); | |
147 | for (i = 0; i < n; ++i) { | |
148 | resp[i]->resp_retcode = 0; | |
149 | resp[i]->resp = NULL; | |
150 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
151 | case PAM_PROMPT_ECHO_OFF: | |
152 | buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg)); | |
153 | ssh_msg_send(ctxt->pam_csock, | |
154 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
155 | ssh_msg_recv(ctxt->pam_csock, &buffer); | |
156 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) | |
157 | goto fail; | |
158 | resp[i]->resp = buffer_get_string(&buffer, NULL); | |
159 | break; | |
160 | case PAM_PROMPT_ECHO_ON: | |
161 | buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg)); | |
162 | ssh_msg_send(ctxt->pam_csock, | |
163 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
164 | ssh_msg_recv(ctxt->pam_csock, &buffer); | |
165 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) | |
166 | goto fail; | |
167 | resp[i]->resp = buffer_get_string(&buffer, NULL); | |
168 | break; | |
169 | case PAM_ERROR_MSG: | |
170 | buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg)); | |
171 | ssh_msg_send(ctxt->pam_csock, | |
172 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
173 | break; | |
174 | case PAM_TEXT_INFO: | |
175 | buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg)); | |
176 | ssh_msg_send(ctxt->pam_csock, | |
177 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
178 | break; | |
179 | default: | |
180 | goto fail; | |
181 | } | |
182 | buffer_clear(&buffer); | |
183 | } | |
184 | buffer_free(&buffer); | |
185 | return (PAM_SUCCESS); | |
186 | fail: | |
187 | while (i) | |
188 | xfree(resp[--i]); | |
189 | xfree(*resp); | |
190 | *resp = NULL; | |
191 | buffer_free(&buffer); | |
192 | return (PAM_CONV_ERR); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Authentication thread. | |
197 | */ | |
198 | static void * | |
199 | sshpam_thread(void *ctxtp) | |
200 | { | |
201 | struct pam_ctxt *ctxt = ctxtp; | |
202 | Buffer buffer; | |
203 | struct pam_conv sshpam_conv = { sshpam_thread_conv, ctxt }; | |
204 | #ifndef USE_POSIX_THREADS | |
205 | const char *pam_user; | |
206 | ||
207 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); | |
208 | setproctitle("%s [pam]", pam_user); | |
209 | #endif | |
210 | ||
211 | buffer_init(&buffer); | |
212 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
213 | (const void *)&sshpam_conv); | |
214 | if (sshpam_err != PAM_SUCCESS) | |
215 | goto auth_fail; | |
216 | sshpam_err = pam_authenticate(sshpam_handle, 0); | |
217 | if (sshpam_err != PAM_SUCCESS) | |
218 | goto auth_fail; | |
219 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); | |
220 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) | |
221 | goto auth_fail; | |
222 | buffer_put_cstring(&buffer, "OK"); | |
223 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); | |
224 | buffer_free(&buffer); | |
225 | pthread_exit(NULL); | |
226 | ||
227 | auth_fail: | |
228 | buffer_put_cstring(&buffer, | |
229 | pam_strerror(sshpam_handle, sshpam_err)); | |
230 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); | |
231 | buffer_free(&buffer); | |
232 | pthread_exit(NULL); | |
233 | ||
234 | return (NULL); /* Avoid warning for non-pthread case */ | |
235 | } | |
236 | ||
237 | static void | |
238 | sshpam_thread_cleanup(void *ctxtp) | |
239 | { | |
240 | struct pam_ctxt *ctxt = ctxtp; | |
241 | ||
242 | pthread_cancel(ctxt->pam_thread); | |
243 | pthread_join(ctxt->pam_thread, NULL); | |
244 | close(ctxt->pam_psock); | |
245 | close(ctxt->pam_csock); | |
246 | } | |
247 | ||
248 | static int | |
249 | sshpam_null_conv(int n, | |
250 | const struct pam_message **msg, | |
251 | struct pam_response **resp, | |
252 | void *data) | |
253 | { | |
254 | ||
255 | return (PAM_CONV_ERR); | |
256 | } | |
257 | ||
258 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; | |
259 | ||
260 | static void | |
261 | sshpam_cleanup(void *arg) | |
262 | { | |
263 | (void)arg; | |
264 | debug("PAM: cleanup"); | |
265 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); | |
266 | if (sshpam_cred_established) { | |
267 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
268 | sshpam_cred_established = 0; | |
269 | } | |
270 | if (sshpam_session_open) { | |
271 | pam_close_session(sshpam_handle, PAM_SILENT); | |
272 | sshpam_session_open = 0; | |
273 | } | |
274 | sshpam_authenticated = sshpam_new_authtok_reqd = 0; | |
275 | pam_end(sshpam_handle, sshpam_err); | |
276 | sshpam_handle = NULL; | |
277 | } | |
278 | ||
279 | static int | |
280 | sshpam_init(const char *user) | |
281 | { | |
282 | extern u_int utmp_len; | |
283 | const char *pam_rhost, *pam_user; | |
284 | ||
285 | if (sshpam_handle != NULL) { | |
286 | /* We already have a PAM context; check if the user matches */ | |
287 | sshpam_err = pam_get_item(sshpam_handle, | |
288 | PAM_USER, (const void **)&pam_user); | |
289 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) | |
290 | return (0); | |
291 | fatal_remove_cleanup(sshpam_cleanup, NULL); | |
292 | pam_end(sshpam_handle, sshpam_err); | |
293 | sshpam_handle = NULL; | |
294 | } | |
295 | debug("PAM: initializing for \"%s\"", user); | |
296 | sshpam_err = pam_start("sshd", user, &null_conv, &sshpam_handle); | |
297 | if (sshpam_err != PAM_SUCCESS) { | |
298 | pam_end(sshpam_handle, sshpam_err); | |
299 | sshpam_handle = NULL; | |
300 | return (-1); | |
301 | } | |
302 | pam_rhost = get_remote_name_or_ip(utmp_len, | |
303 | options.verify_reverse_mapping); | |
304 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); | |
305 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); | |
306 | if (sshpam_err != PAM_SUCCESS) { | |
307 | pam_end(sshpam_handle, sshpam_err); | |
308 | sshpam_handle = NULL; | |
309 | return (-1); | |
310 | } | |
311 | #ifdef PAM_TTY_KLUDGE | |
312 | /* | |
313 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
314 | * sshd doesn't set the tty until too late in the auth process and | |
315 | * may not even set one (for tty-less connections) | |
316 | */ | |
317 | debug("PAM: setting PAM_TTY to \"ssh\""); | |
318 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
319 | if (sshpam_err != PAM_SUCCESS) { | |
320 | pam_end(sshpam_handle, sshpam_err); | |
321 | sshpam_handle = NULL; | |
322 | return (-1); | |
323 | } | |
324 | #endif | |
325 | fatal_add_cleanup(sshpam_cleanup, NULL); | |
326 | return (0); | |
327 | } | |
328 | ||
329 | static void * | |
330 | sshpam_init_ctx(Authctxt *authctxt) | |
331 | { | |
332 | struct pam_ctxt *ctxt; | |
333 | int socks[2]; | |
334 | ||
335 | /* Refuse to start if we don't have PAM enabled */ | |
336 | if (!options.use_pam) | |
337 | return NULL; | |
338 | ||
339 | /* Initialize PAM */ | |
340 | if (sshpam_init(authctxt->user) == -1) { | |
341 | error("PAM: initialization failed"); | |
342 | return (NULL); | |
343 | } | |
344 | ||
345 | ctxt = xmalloc(sizeof *ctxt); | |
346 | ctxt->pam_done = 0; | |
347 | ||
348 | /* Start the authentication thread */ | |
349 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
350 | error("PAM: failed create sockets: %s", strerror(errno)); | |
351 | xfree(ctxt); | |
352 | return (NULL); | |
353 | } | |
354 | ctxt->pam_psock = socks[0]; | |
355 | ctxt->pam_csock = socks[1]; | |
356 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
357 | error("PAM: failed to start authentication thread: %s", | |
358 | strerror(errno)); | |
359 | close(socks[0]); | |
360 | close(socks[1]); | |
361 | xfree(ctxt); | |
362 | return (NULL); | |
363 | } | |
364 | fatal_add_cleanup(sshpam_thread_cleanup, ctxt); | |
365 | return (ctxt); | |
366 | } | |
367 | ||
368 | static int | |
369 | sshpam_query(void *ctx, char **name, char **info, | |
370 | u_int *num, char ***prompts, u_int **echo_on) | |
371 | { | |
372 | Buffer buffer; | |
373 | struct pam_ctxt *ctxt = ctx; | |
374 | size_t plen; | |
375 | u_char type; | |
376 | char *msg; | |
377 | ||
378 | buffer_init(&buffer); | |
379 | *name = xstrdup(""); | |
380 | *info = xstrdup(""); | |
381 | *prompts = xmalloc(sizeof(char *)); | |
382 | **prompts = NULL; | |
383 | plen = 0; | |
384 | *echo_on = xmalloc(sizeof(u_int)); | |
385 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
386 | type = buffer_get_char(&buffer); | |
387 | msg = buffer_get_string(&buffer, NULL); | |
388 | switch (type) { | |
389 | case PAM_PROMPT_ECHO_ON: | |
390 | case PAM_PROMPT_ECHO_OFF: | |
391 | *num = 1; | |
392 | **prompts = xrealloc(**prompts, plen + strlen(msg) + 1); | |
393 | plen += sprintf(**prompts + plen, "%s", msg); | |
394 | **echo_on = (type == PAM_PROMPT_ECHO_ON); | |
395 | xfree(msg); | |
396 | return (0); | |
397 | case PAM_ERROR_MSG: | |
398 | case PAM_TEXT_INFO: | |
399 | /* accumulate messages */ | |
400 | **prompts = xrealloc(**prompts, plen + strlen(msg) + 1); | |
401 | plen += sprintf(**prompts + plen, "%s", msg); | |
402 | xfree(msg); | |
403 | break; | |
404 | case PAM_NEW_AUTHTOK_REQD: | |
405 | sshpam_new_authtok_reqd = 1; | |
406 | /* FALLTHROUGH */ | |
407 | case PAM_SUCCESS: | |
408 | case PAM_AUTH_ERR: | |
409 | if (**prompts != NULL) { | |
410 | /* drain any accumulated messages */ | |
411 | #if 0 /* XXX - not compatible with privsep */ | |
412 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
413 | packet_put_cstring(**prompts); | |
414 | packet_put_cstring(""); | |
415 | packet_send(); | |
416 | packet_write_wait(); | |
417 | #endif | |
418 | xfree(**prompts); | |
419 | **prompts = NULL; | |
420 | } | |
421 | if (type == PAM_SUCCESS) { | |
422 | *num = 0; | |
423 | **echo_on = 0; | |
424 | ctxt->pam_done = 1; | |
425 | xfree(msg); | |
426 | return (0); | |
427 | } | |
428 | error("PAM: %s", msg); | |
429 | default: | |
430 | *num = 0; | |
431 | **echo_on = 0; | |
432 | xfree(msg); | |
433 | ctxt->pam_done = -1; | |
434 | return (-1); | |
435 | } | |
436 | } | |
437 | return (-1); | |
438 | } | |
439 | ||
440 | /* XXX - see also comment in auth-chall.c:verify_response */ | |
441 | static int | |
442 | sshpam_respond(void *ctx, u_int num, char **resp) | |
443 | { | |
444 | Buffer buffer; | |
445 | struct pam_ctxt *ctxt = ctx; | |
446 | ||
447 | debug2("PAM: %s", __func__); | |
448 | switch (ctxt->pam_done) { | |
449 | case 1: | |
450 | sshpam_authenticated = 1; | |
451 | return (0); | |
452 | case 0: | |
453 | break; | |
454 | default: | |
455 | return (-1); | |
456 | } | |
457 | if (num != 1) { | |
458 | error("PAM: expected one response, got %u", num); | |
459 | return (-1); | |
460 | } | |
461 | buffer_init(&buffer); | |
462 | buffer_put_cstring(&buffer, *resp); | |
463 | ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer); | |
464 | buffer_free(&buffer); | |
465 | return (1); | |
466 | } | |
467 | ||
468 | static void | |
469 | sshpam_free_ctx(void *ctxtp) | |
470 | { | |
471 | struct pam_ctxt *ctxt = ctxtp; | |
472 | ||
473 | fatal_remove_cleanup(sshpam_thread_cleanup, ctxt); | |
474 | sshpam_thread_cleanup(ctxtp); | |
475 | xfree(ctxt); | |
476 | /* | |
477 | * We don't call sshpam_cleanup() here because we may need the PAM | |
478 | * handle at a later stage, e.g. when setting up a session. It's | |
479 | * still on the cleanup list, so pam_end() *will* be called before | |
480 | * the server process terminates. | |
481 | */ | |
482 | } | |
483 | ||
484 | KbdintDevice sshpam_device = { | |
485 | "pam", | |
486 | sshpam_init_ctx, | |
487 | sshpam_query, | |
488 | sshpam_respond, | |
489 | sshpam_free_ctx | |
490 | }; | |
491 | ||
492 | KbdintDevice mm_sshpam_device = { | |
493 | "pam", | |
494 | mm_sshpam_init_ctx, | |
495 | mm_sshpam_query, | |
496 | mm_sshpam_respond, | |
497 | mm_sshpam_free_ctx | |
498 | }; | |
499 | ||
500 | /* | |
501 | * This replaces auth-pam.c | |
502 | */ | |
503 | void | |
504 | start_pam(const char *user) | |
505 | { | |
506 | if (!options.use_pam) | |
507 | fatal("PAM: initialisation requested when UsePAM=no"); | |
508 | ||
509 | if (sshpam_init(user) == -1) | |
510 | fatal("PAM: initialisation failed"); | |
511 | } | |
512 | ||
513 | void | |
514 | finish_pam(void) | |
515 | { | |
516 | fatal_remove_cleanup(sshpam_cleanup, NULL); | |
517 | sshpam_cleanup(NULL); | |
518 | } | |
519 | ||
520 | int | |
521 | do_pam_account(const char *user, const char *ruser) | |
522 | { | |
523 | /* XXX */ | |
524 | return (1); | |
525 | } | |
526 | ||
527 | void | |
528 | do_pam_session(const char *user, const char *tty) | |
529 | { | |
530 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
531 | (const void *)&null_conv); | |
532 | if (sshpam_err != PAM_SUCCESS) | |
533 | fatal("PAM: failed to set PAM_CONV: %s", | |
534 | pam_strerror(sshpam_handle, sshpam_err)); | |
535 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
536 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
537 | if (sshpam_err != PAM_SUCCESS) | |
538 | fatal("PAM: failed to set PAM_TTY: %s", | |
539 | pam_strerror(sshpam_handle, sshpam_err)); | |
540 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
541 | if (sshpam_err != PAM_SUCCESS) | |
542 | fatal("PAM: pam_open_session(): %s", | |
543 | pam_strerror(sshpam_handle, sshpam_err)); | |
544 | sshpam_session_open = 1; | |
545 | } | |
546 | ||
547 | void | |
548 | do_pam_setcred(int init) | |
549 | { | |
550 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
551 | (const void *)&null_conv); | |
552 | if (sshpam_err != PAM_SUCCESS) | |
553 | fatal("PAM: failed to set PAM_CONV: %s", | |
554 | pam_strerror(sshpam_handle, sshpam_err)); | |
555 | if (init) { | |
556 | debug("PAM: establishing credentials"); | |
557 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
558 | } else { | |
559 | debug("PAM: reinitializing credentials"); | |
560 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
561 | } | |
562 | if (sshpam_err == PAM_SUCCESS) { | |
563 | sshpam_cred_established = 1; | |
564 | return; | |
565 | } | |
566 | if (sshpam_authenticated) | |
567 | fatal("PAM: pam_setcred(): %s", | |
568 | pam_strerror(sshpam_handle, sshpam_err)); | |
569 | else | |
570 | debug("PAM: pam_setcred(): %s", | |
571 | pam_strerror(sshpam_handle, sshpam_err)); | |
572 | } | |
573 | ||
574 | int | |
575 | is_pam_password_change_required(void) | |
576 | { | |
577 | return (sshpam_new_authtok_reqd); | |
578 | } | |
579 | ||
580 | static int | |
581 | pam_chauthtok_conv(int n, | |
582 | const struct pam_message **msg, | |
583 | struct pam_response **resp, | |
584 | void *data) | |
585 | { | |
586 | char input[PAM_MAX_MSG_SIZE]; | |
587 | int i; | |
588 | ||
589 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
590 | return (PAM_CONV_ERR); | |
591 | *resp = xmalloc(n * sizeof **resp); | |
592 | for (i = 0; i < n; ++i) { | |
593 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
594 | case PAM_PROMPT_ECHO_OFF: | |
595 | resp[i]->resp = | |
596 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), | |
597 | RP_ALLOW_STDIN); | |
598 | resp[i]->resp_retcode = PAM_SUCCESS; | |
599 | break; | |
600 | case PAM_PROMPT_ECHO_ON: | |
601 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
602 | fgets(input, sizeof input, stdin); | |
603 | resp[i]->resp = xstrdup(input); | |
604 | resp[i]->resp_retcode = PAM_SUCCESS; | |
605 | break; | |
606 | case PAM_ERROR_MSG: | |
607 | case PAM_TEXT_INFO: | |
608 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
609 | resp[i]->resp_retcode = PAM_SUCCESS; | |
610 | break; | |
611 | default: | |
612 | goto fail; | |
613 | } | |
614 | } | |
615 | return (PAM_SUCCESS); | |
616 | fail: | |
617 | while (i) | |
618 | xfree(resp[--i]); | |
619 | xfree(*resp); | |
620 | *resp = NULL; | |
621 | return (PAM_CONV_ERR); | |
622 | } | |
623 | ||
624 | /* | |
625 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
626 | * support that | |
627 | */ | |
628 | void | |
629 | do_pam_chauthtok(void) | |
630 | { | |
631 | struct pam_conv pam_conv = { pam_chauthtok_conv, NULL }; | |
632 | ||
633 | if (use_privsep) | |
634 | fatal("PAM: chauthtok not supprted with privsep"); | |
635 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
636 | (const void *)&pam_conv); | |
637 | if (sshpam_err != PAM_SUCCESS) | |
638 | fatal("PAM: failed to set PAM_CONV: %s", | |
639 | pam_strerror(sshpam_handle, sshpam_err)); | |
640 | debug("PAM: changing password"); | |
641 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
642 | if (sshpam_err != PAM_SUCCESS) | |
643 | fatal("PAM: pam_chauthtok(): %s", | |
644 | pam_strerror(sshpam_handle, sshpam_err)); | |
645 | } | |
646 | ||
647 | void | |
648 | print_pam_messages(void) | |
649 | { | |
650 | /* XXX */ | |
651 | } | |
652 | ||
653 | char ** | |
654 | fetch_pam_environment(void) | |
655 | { | |
656 | #ifdef HAVE_PAM_GETENVLIST | |
657 | debug("PAM: retrieving environment"); | |
658 | return (pam_getenvlist(sshpam_handle)); | |
659 | #else | |
660 | return (NULL); | |
661 | #endif | |
662 | } | |
663 | ||
664 | void | |
665 | free_pam_environment(char **env) | |
666 | { | |
667 | char **envp; | |
668 | ||
669 | if (env == NULL) | |
670 | return; | |
671 | ||
672 | for (envp = env; *envp; envp++) | |
673 | xfree(*envp); | |
674 | xfree(env); | |
675 | } | |
676 | ||
677 | #endif /* USE_PAM */ |