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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 | #include "auth-options.h" | |
53 | ||
54 | extern ServerOptions options; | |
55 | ||
56 | #define __unused | |
57 | ||
58 | #ifdef USE_POSIX_THREADS | |
59 | #include <pthread.h> | |
60 | /* | |
61 | * Avoid namespace clash when *not* using pthreads for systems *with* | |
62 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
63 | * (e.g. Linux) | |
64 | */ | |
65 | typedef pthread_t sp_pthread_t; | |
66 | #else | |
67 | /* | |
68 | * Simulate threads with processes. | |
69 | */ | |
70 | typedef pid_t sp_pthread_t; | |
71 | ||
72 | static void | |
73 | pthread_exit(void *value __unused) | |
74 | { | |
75 | _exit(0); | |
76 | } | |
77 | ||
78 | static int | |
79 | pthread_create(sp_pthread_t *thread, const void *attr __unused, | |
80 | void *(*thread_start)(void *), void *arg) | |
81 | { | |
82 | pid_t pid; | |
83 | ||
84 | switch ((pid = fork())) { | |
85 | case -1: | |
86 | error("fork(): %s", strerror(errno)); | |
87 | return (-1); | |
88 | case 0: | |
89 | thread_start(arg); | |
90 | _exit(1); | |
91 | default: | |
92 | *thread = pid; | |
93 | return (0); | |
94 | } | |
95 | } | |
96 | ||
97 | static int | |
98 | pthread_cancel(sp_pthread_t thread) | |
99 | { | |
100 | return (kill(thread, SIGTERM)); | |
101 | } | |
102 | ||
103 | static int | |
104 | pthread_join(sp_pthread_t thread, void **value __unused) | |
105 | { | |
106 | int status; | |
107 | ||
108 | waitpid(thread, &status, 0); | |
109 | return (status); | |
110 | } | |
111 | #endif | |
112 | ||
113 | ||
114 | static pam_handle_t *sshpam_handle = NULL; | |
115 | static int sshpam_err = 0; | |
116 | static int sshpam_authenticated = 0; | |
117 | static int sshpam_new_authtok_reqd = 0; | |
118 | static int sshpam_session_open = 0; | |
119 | static int sshpam_cred_established = 0; | |
120 | ||
121 | struct pam_ctxt { | |
122 | sp_pthread_t pam_thread; | |
123 | int pam_psock; | |
124 | int pam_csock; | |
125 | int pam_done; | |
126 | }; | |
127 | ||
128 | static void sshpam_free_ctx(void *); | |
129 | static struct pam_ctxt *cleanup_ctxt; | |
130 | ||
131 | /* | |
132 | * Conversation function for authentication thread. | |
133 | */ | |
134 | static int | |
135 | sshpam_thread_conv(int n, const struct pam_message **msg, | |
136 | struct pam_response **resp, void *data) | |
137 | { | |
138 | Buffer buffer; | |
139 | struct pam_ctxt *ctxt; | |
140 | struct pam_response *reply; | |
141 | int i; | |
142 | ||
143 | *resp = NULL; | |
144 | ||
145 | ctxt = data; | |
146 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
147 | return (PAM_CONV_ERR); | |
148 | ||
149 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
150 | return (PAM_CONV_ERR); | |
151 | memset(reply, 0, n * sizeof(*reply)); | |
152 | ||
153 | buffer_init(&buffer); | |
154 | for (i = 0; i < n; ++i) { | |
155 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
156 | case PAM_PROMPT_ECHO_OFF: | |
157 | buffer_put_cstring(&buffer, | |
158 | PAM_MSG_MEMBER(msg, i, msg)); | |
159 | ssh_msg_send(ctxt->pam_csock, | |
160 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
161 | ssh_msg_recv(ctxt->pam_csock, &buffer); | |
162 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) | |
163 | goto fail; | |
164 | reply[i].resp = buffer_get_string(&buffer, NULL); | |
165 | break; | |
166 | case PAM_PROMPT_ECHO_ON: | |
167 | buffer_put_cstring(&buffer, | |
168 | PAM_MSG_MEMBER(msg, i, msg)); | |
169 | ssh_msg_send(ctxt->pam_csock, | |
170 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
171 | ssh_msg_recv(ctxt->pam_csock, &buffer); | |
172 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) | |
173 | goto fail; | |
174 | reply[i].resp = buffer_get_string(&buffer, NULL); | |
175 | break; | |
176 | case PAM_ERROR_MSG: | |
177 | buffer_put_cstring(&buffer, | |
178 | PAM_MSG_MEMBER(msg, i, msg)); | |
179 | ssh_msg_send(ctxt->pam_csock, | |
180 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
181 | break; | |
182 | case PAM_TEXT_INFO: | |
183 | buffer_put_cstring(&buffer, | |
184 | PAM_MSG_MEMBER(msg, i, msg)); | |
185 | ssh_msg_send(ctxt->pam_csock, | |
186 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
187 | break; | |
188 | default: | |
189 | goto fail; | |
190 | } | |
191 | buffer_clear(&buffer); | |
192 | } | |
193 | buffer_free(&buffer); | |
194 | *resp = reply; | |
195 | return (PAM_SUCCESS); | |
196 | ||
197 | fail: | |
198 | for(i = 0; i < n; i++) { | |
199 | if (reply[i].resp != NULL) | |
200 | xfree(reply[i].resp); | |
201 | } | |
202 | xfree(reply); | |
203 | buffer_free(&buffer); | |
204 | return (PAM_CONV_ERR); | |
205 | } | |
206 | ||
207 | /* | |
208 | * Authentication thread. | |
209 | */ | |
210 | static void * | |
211 | sshpam_thread(void *ctxtp) | |
212 | { | |
213 | struct pam_ctxt *ctxt = ctxtp; | |
214 | Buffer buffer; | |
215 | struct pam_conv sshpam_conv; | |
216 | #ifndef USE_POSIX_THREADS | |
217 | const char *pam_user; | |
218 | ||
219 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); | |
220 | setproctitle("%s [pam]", pam_user); | |
221 | #endif | |
222 | ||
223 | sshpam_conv.conv = sshpam_thread_conv; | |
224 | sshpam_conv.appdata_ptr = ctxt; | |
225 | ||
226 | buffer_init(&buffer); | |
227 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
228 | (const void *)&sshpam_conv); | |
229 | if (sshpam_err != PAM_SUCCESS) | |
230 | goto auth_fail; | |
231 | sshpam_err = pam_authenticate(sshpam_handle, 0); | |
232 | if (sshpam_err != PAM_SUCCESS) | |
233 | goto auth_fail; | |
234 | buffer_put_cstring(&buffer, "OK"); | |
235 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); | |
236 | buffer_free(&buffer); | |
237 | pthread_exit(NULL); | |
238 | ||
239 | auth_fail: | |
240 | buffer_put_cstring(&buffer, | |
241 | pam_strerror(sshpam_handle, sshpam_err)); | |
242 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); | |
243 | buffer_free(&buffer); | |
244 | pthread_exit(NULL); | |
245 | ||
246 | return (NULL); /* Avoid warning for non-pthread case */ | |
247 | } | |
248 | ||
249 | void | |
250 | sshpam_thread_cleanup(void) | |
251 | { | |
252 | struct pam_ctxt *ctxt = cleanup_ctxt; | |
253 | ||
254 | if (ctxt != NULL && ctxt->pam_thread != 0) { | |
255 | pthread_cancel(ctxt->pam_thread); | |
256 | pthread_join(ctxt->pam_thread, NULL); | |
257 | close(ctxt->pam_psock); | |
258 | close(ctxt->pam_csock); | |
259 | memset(ctxt, 0, sizeof(*ctxt)); | |
260 | cleanup_ctxt = NULL; | |
261 | } | |
262 | } | |
263 | ||
264 | static int | |
265 | sshpam_null_conv(int n, const struct pam_message **msg, | |
266 | struct pam_response **resp, void *data) | |
267 | { | |
268 | return (PAM_CONV_ERR); | |
269 | } | |
270 | ||
271 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; | |
272 | ||
273 | void | |
274 | sshpam_cleanup(void) | |
275 | { | |
276 | debug("PAM: cleanup"); | |
277 | if (sshpam_handle == NULL) | |
278 | return; | |
279 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); | |
280 | if (sshpam_cred_established) { | |
281 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
282 | sshpam_cred_established = 0; | |
283 | } | |
284 | if (sshpam_session_open) { | |
285 | pam_close_session(sshpam_handle, PAM_SILENT); | |
286 | sshpam_session_open = 0; | |
287 | } | |
288 | sshpam_authenticated = sshpam_new_authtok_reqd = 0; | |
289 | pam_end(sshpam_handle, sshpam_err); | |
290 | sshpam_handle = NULL; | |
291 | } | |
292 | ||
293 | static int | |
294 | sshpam_init(const char *user) | |
295 | { | |
296 | extern u_int utmp_len; | |
297 | extern char *__progname; | |
298 | const char *pam_rhost, *pam_user; | |
299 | ||
300 | if (sshpam_handle != NULL) { | |
301 | /* We already have a PAM context; check if the user matches */ | |
302 | sshpam_err = pam_get_item(sshpam_handle, | |
303 | PAM_USER, (const void **)&pam_user); | |
304 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) | |
305 | return (0); | |
306 | pam_end(sshpam_handle, sshpam_err); | |
307 | sshpam_handle = NULL; | |
308 | } | |
309 | debug("PAM: initializing for \"%s\"", user); | |
310 | sshpam_err = | |
311 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); | |
312 | if (sshpam_err != PAM_SUCCESS) { | |
313 | pam_end(sshpam_handle, sshpam_err); | |
314 | sshpam_handle = NULL; | |
315 | return (-1); | |
316 | } | |
317 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); | |
318 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); | |
319 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); | |
320 | if (sshpam_err != PAM_SUCCESS) { | |
321 | pam_end(sshpam_handle, sshpam_err); | |
322 | sshpam_handle = NULL; | |
323 | return (-1); | |
324 | } | |
325 | #ifdef PAM_TTY_KLUDGE | |
326 | /* | |
327 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
328 | * sshd doesn't set the tty until too late in the auth process and | |
329 | * may not even set one (for tty-less connections) | |
330 | */ | |
331 | debug("PAM: setting PAM_TTY to \"ssh\""); | |
332 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
333 | if (sshpam_err != PAM_SUCCESS) { | |
334 | pam_end(sshpam_handle, sshpam_err); | |
335 | sshpam_handle = NULL; | |
336 | return (-1); | |
337 | } | |
338 | #endif | |
339 | return (0); | |
340 | } | |
341 | ||
342 | static void * | |
343 | sshpam_init_ctx(Authctxt *authctxt) | |
344 | { | |
345 | struct pam_ctxt *ctxt; | |
346 | int socks[2]; | |
347 | ||
348 | /* Refuse to start if we don't have PAM enabled */ | |
349 | if (!options.use_pam) | |
350 | return NULL; | |
351 | ||
352 | /* Initialize PAM */ | |
353 | if (sshpam_init(authctxt->user) == -1) { | |
354 | error("PAM: initialization failed"); | |
355 | return (NULL); | |
356 | } | |
357 | ||
358 | ctxt = xmalloc(sizeof *ctxt); | |
359 | memset(ctxt, 0, sizeof(*ctxt)); | |
360 | ||
361 | /* Start the authentication thread */ | |
362 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
363 | error("PAM: failed create sockets: %s", strerror(errno)); | |
364 | xfree(ctxt); | |
365 | return (NULL); | |
366 | } | |
367 | ctxt->pam_psock = socks[0]; | |
368 | ctxt->pam_csock = socks[1]; | |
369 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
370 | error("PAM: failed to start authentication thread: %s", | |
371 | strerror(errno)); | |
372 | close(socks[0]); | |
373 | close(socks[1]); | |
374 | xfree(ctxt); | |
375 | return (NULL); | |
376 | } | |
377 | cleanup_ctxt = ctxt; | |
378 | return (ctxt); | |
379 | } | |
380 | ||
381 | static int | |
382 | sshpam_query(void *ctx, char **name, char **info, | |
383 | u_int *num, char ***prompts, u_int **echo_on) | |
384 | { | |
385 | Buffer buffer; | |
386 | struct pam_ctxt *ctxt = ctx; | |
387 | size_t plen; | |
388 | u_char type; | |
389 | char *msg; | |
390 | size_t len; | |
391 | ||
392 | buffer_init(&buffer); | |
393 | *name = xstrdup(""); | |
394 | *info = xstrdup(""); | |
395 | *prompts = xmalloc(sizeof(char *)); | |
396 | **prompts = NULL; | |
397 | plen = 0; | |
398 | *echo_on = xmalloc(sizeof(u_int)); | |
399 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
400 | type = buffer_get_char(&buffer); | |
401 | msg = buffer_get_string(&buffer, NULL); | |
402 | switch (type) { | |
403 | case PAM_PROMPT_ECHO_ON: | |
404 | case PAM_PROMPT_ECHO_OFF: | |
405 | *num = 1; | |
406 | len = plen + strlen(msg) + 1; | |
407 | **prompts = xrealloc(**prompts, len); | |
408 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
409 | **echo_on = (type == PAM_PROMPT_ECHO_ON); | |
410 | xfree(msg); | |
411 | return (0); | |
412 | case PAM_ERROR_MSG: | |
413 | case PAM_TEXT_INFO: | |
414 | /* accumulate messages */ | |
415 | len = plen + strlen(msg) + 1; | |
416 | **prompts = xrealloc(**prompts, len); | |
417 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
418 | xfree(msg); | |
419 | break; | |
420 | case PAM_SUCCESS: | |
421 | case PAM_AUTH_ERR: | |
422 | if (**prompts != NULL) { | |
423 | /* drain any accumulated messages */ | |
424 | #if 0 /* XXX - not compatible with privsep */ | |
425 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
426 | packet_put_cstring(**prompts); | |
427 | packet_put_cstring(""); | |
428 | packet_send(); | |
429 | packet_write_wait(); | |
430 | #endif | |
431 | xfree(**prompts); | |
432 | **prompts = NULL; | |
433 | } | |
434 | if (type == PAM_SUCCESS) { | |
435 | *num = 0; | |
436 | **echo_on = 0; | |
437 | ctxt->pam_done = 1; | |
438 | xfree(msg); | |
439 | return (0); | |
440 | } | |
441 | error("PAM: %s", msg); | |
442 | /* FALLTHROUGH */ | |
443 | default: | |
444 | *num = 0; | |
445 | **echo_on = 0; | |
446 | xfree(msg); | |
447 | ctxt->pam_done = -1; | |
448 | return (-1); | |
449 | } | |
450 | } | |
451 | return (-1); | |
452 | } | |
453 | ||
454 | /* XXX - see also comment in auth-chall.c:verify_response */ | |
455 | static int | |
456 | sshpam_respond(void *ctx, u_int num, char **resp) | |
457 | { | |
458 | Buffer buffer; | |
459 | struct pam_ctxt *ctxt = ctx; | |
460 | ||
461 | debug2("PAM: %s", __func__); | |
462 | switch (ctxt->pam_done) { | |
463 | case 1: | |
464 | sshpam_authenticated = 1; | |
465 | return (0); | |
466 | case 0: | |
467 | break; | |
468 | default: | |
469 | return (-1); | |
470 | } | |
471 | if (num != 1) { | |
472 | error("PAM: expected one response, got %u", num); | |
473 | return (-1); | |
474 | } | |
475 | buffer_init(&buffer); | |
476 | buffer_put_cstring(&buffer, *resp); | |
477 | ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer); | |
478 | buffer_free(&buffer); | |
479 | return (1); | |
480 | } | |
481 | ||
482 | static void | |
483 | sshpam_free_ctx(void *ctxtp) | |
484 | { | |
485 | struct pam_ctxt *ctxt = ctxtp; | |
486 | ||
487 | sshpam_thread_cleanup(); | |
488 | xfree(ctxt); | |
489 | /* | |
490 | * We don't call sshpam_cleanup() here because we may need the PAM | |
491 | * handle at a later stage, e.g. when setting up a session. It's | |
492 | * still on the cleanup list, so pam_end() *will* be called before | |
493 | * the server process terminates. | |
494 | */ | |
495 | } | |
496 | ||
497 | KbdintDevice sshpam_device = { | |
498 | "pam", | |
499 | sshpam_init_ctx, | |
500 | sshpam_query, | |
501 | sshpam_respond, | |
502 | sshpam_free_ctx | |
503 | }; | |
504 | ||
505 | KbdintDevice mm_sshpam_device = { | |
506 | "pam", | |
507 | mm_sshpam_init_ctx, | |
508 | mm_sshpam_query, | |
509 | mm_sshpam_respond, | |
510 | mm_sshpam_free_ctx | |
511 | }; | |
512 | ||
513 | /* | |
514 | * This replaces auth-pam.c | |
515 | */ | |
516 | void | |
517 | start_pam(const char *user) | |
518 | { | |
519 | if (!options.use_pam) | |
520 | fatal("PAM: initialisation requested when UsePAM=no"); | |
521 | ||
522 | if (sshpam_init(user) == -1) | |
523 | fatal("PAM: initialisation failed"); | |
524 | } | |
525 | ||
526 | void | |
527 | finish_pam(void) | |
528 | { | |
529 | sshpam_cleanup(); | |
530 | } | |
531 | ||
532 | u_int | |
533 | do_pam_account(void) | |
534 | { | |
535 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); | |
536 | debug3("%s: pam_acct_mgmt = %d", __func__, sshpam_err); | |
537 | ||
538 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) | |
539 | return (0); | |
540 | ||
541 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) { | |
542 | sshpam_new_authtok_reqd = 1; | |
543 | ||
544 | /* Prevent forwardings until password changed */ | |
545 | no_port_forwarding_flag |= 2; | |
546 | no_agent_forwarding_flag |= 2; | |
547 | no_x11_forwarding_flag |= 2; | |
548 | } | |
549 | ||
550 | return (1); | |
551 | } | |
552 | ||
553 | void | |
554 | do_pam_session(void) | |
555 | { | |
556 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
557 | (const void *)&null_conv); | |
558 | if (sshpam_err != PAM_SUCCESS) | |
559 | fatal("PAM: failed to set PAM_CONV: %s", | |
560 | pam_strerror(sshpam_handle, sshpam_err)); | |
561 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
562 | if (sshpam_err != PAM_SUCCESS) | |
563 | fatal("PAM: pam_open_session(): %s", | |
564 | pam_strerror(sshpam_handle, sshpam_err)); | |
565 | sshpam_session_open = 1; | |
566 | } | |
567 | ||
568 | void | |
569 | do_pam_set_tty(const char *tty) | |
570 | { | |
571 | if (tty != NULL) { | |
572 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
573 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
574 | if (sshpam_err != PAM_SUCCESS) | |
575 | fatal("PAM: failed to set PAM_TTY: %s", | |
576 | pam_strerror(sshpam_handle, sshpam_err)); | |
577 | } | |
578 | } | |
579 | ||
580 | void | |
581 | do_pam_setcred(int init) | |
582 | { | |
583 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
584 | (const void *)&null_conv); | |
585 | if (sshpam_err != PAM_SUCCESS) | |
586 | fatal("PAM: failed to set PAM_CONV: %s", | |
587 | pam_strerror(sshpam_handle, sshpam_err)); | |
588 | if (init) { | |
589 | debug("PAM: establishing credentials"); | |
590 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
591 | } else { | |
592 | debug("PAM: reinitializing credentials"); | |
593 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
594 | } | |
595 | if (sshpam_err == PAM_SUCCESS) { | |
596 | sshpam_cred_established = 1; | |
597 | return; | |
598 | } | |
599 | if (sshpam_authenticated) | |
600 | fatal("PAM: pam_setcred(): %s", | |
601 | pam_strerror(sshpam_handle, sshpam_err)); | |
602 | else | |
603 | debug("PAM: pam_setcred(): %s", | |
604 | pam_strerror(sshpam_handle, sshpam_err)); | |
605 | } | |
606 | ||
607 | int | |
608 | is_pam_password_change_required(void) | |
609 | { | |
610 | return (sshpam_new_authtok_reqd); | |
611 | } | |
612 | ||
613 | static int | |
614 | pam_chauthtok_conv(int n, const struct pam_message **msg, | |
615 | struct pam_response **resp, void *data) | |
616 | { | |
617 | char input[PAM_MAX_MSG_SIZE]; | |
618 | struct pam_response *reply; | |
619 | int i; | |
620 | ||
621 | *resp = NULL; | |
622 | ||
623 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
624 | return (PAM_CONV_ERR); | |
625 | ||
626 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
627 | return (PAM_CONV_ERR); | |
628 | memset(reply, 0, n * sizeof(*reply)); | |
629 | ||
630 | for (i = 0; i < n; ++i) { | |
631 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
632 | case PAM_PROMPT_ECHO_OFF: | |
633 | reply[i].resp = | |
634 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), | |
635 | RP_ALLOW_STDIN); | |
636 | reply[i].resp_retcode = PAM_SUCCESS; | |
637 | break; | |
638 | case PAM_PROMPT_ECHO_ON: | |
639 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
640 | fgets(input, sizeof input, stdin); | |
641 | reply[i].resp = xstrdup(input); | |
642 | reply[i].resp_retcode = PAM_SUCCESS; | |
643 | break; | |
644 | case PAM_ERROR_MSG: | |
645 | case PAM_TEXT_INFO: | |
646 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
647 | reply[i].resp_retcode = PAM_SUCCESS; | |
648 | break; | |
649 | default: | |
650 | goto fail; | |
651 | } | |
652 | } | |
653 | *resp = reply; | |
654 | return (PAM_SUCCESS); | |
655 | ||
656 | fail: | |
657 | for(i = 0; i < n; i++) { | |
658 | if (reply[i].resp != NULL) | |
659 | xfree(reply[i].resp); | |
660 | } | |
661 | xfree(reply); | |
662 | return (PAM_CONV_ERR); | |
663 | } | |
664 | ||
665 | /* | |
666 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
667 | * support that | |
668 | */ | |
669 | void | |
670 | do_pam_chauthtok(void) | |
671 | { | |
672 | struct pam_conv pam_conv; | |
673 | ||
674 | pam_conv.conv = pam_chauthtok_conv; | |
675 | pam_conv.appdata_ptr = NULL; | |
676 | ||
677 | if (use_privsep) | |
678 | fatal("Password expired (unable to change with privsep)"); | |
679 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
680 | (const void *)&pam_conv); | |
681 | if (sshpam_err != PAM_SUCCESS) | |
682 | fatal("PAM: failed to set PAM_CONV: %s", | |
683 | pam_strerror(sshpam_handle, sshpam_err)); | |
684 | debug("PAM: changing password"); | |
685 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
686 | if (sshpam_err != PAM_SUCCESS) | |
687 | fatal("PAM: pam_chauthtok(): %s", | |
688 | pam_strerror(sshpam_handle, sshpam_err)); | |
689 | } | |
690 | ||
691 | /* | |
692 | * Set a PAM environment string. We need to do this so that the session | |
693 | * modules can handle things like Kerberos/GSI credentials that appear | |
694 | * during the ssh authentication process. | |
695 | */ | |
696 | ||
697 | int | |
698 | do_pam_putenv(char *name, char *value) | |
699 | { | |
700 | int ret = 1; | |
701 | #ifdef HAVE_PAM_PUTENV | |
702 | char *compound; | |
703 | size_t len; | |
704 | ||
705 | len = strlen(name) + strlen(value) + 2; | |
706 | compound = xmalloc(len); | |
707 | ||
708 | snprintf(compound, len, "%s=%s", name, value); | |
709 | ret = pam_putenv(sshpam_handle, compound); | |
710 | xfree(compound); | |
711 | #endif | |
712 | ||
713 | return (ret); | |
714 | } | |
715 | ||
716 | void | |
717 | print_pam_messages(void) | |
718 | { | |
719 | /* XXX */ | |
720 | } | |
721 | ||
722 | char ** | |
723 | fetch_pam_environment(void) | |
724 | { | |
725 | #ifdef HAVE_PAM_GETENVLIST | |
726 | debug("PAM: retrieving environment"); | |
727 | return (pam_getenvlist(sshpam_handle)); | |
728 | #else | |
729 | return (NULL); | |
730 | #endif | |
731 | } | |
732 | ||
733 | void | |
734 | free_pam_environment(char **env) | |
735 | { | |
736 | char **envp; | |
737 | ||
738 | if (env == NULL) | |
739 | return; | |
740 | ||
741 | for (envp = env; *envp; envp++) | |
742 | xfree(*envp); | |
743 | xfree(env); | |
744 | } | |
745 | ||
746 | #endif /* USE_PAM */ |