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05114c74 | 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. | |
09564242 | 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. | |
09564242 | 18 | * |
05114c74 | 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. | |
a5c9cd31 | 30 | */ |
31 | ||
5ff453c0 | 32 | /* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */ |
a5c9cd31 | 33 | #include "includes.h" |
5ff453c0 | 34 | RCSID("$Id$"); |
a5c9cd31 | 35 | |
36 | #ifdef USE_PAM | |
05114c74 | 37 | #include <security/pam_appl.h> |
38 | ||
fde58bd4 | 39 | #include "auth.h" |
5c377b3b | 40 | #include "auth-pam.h" |
05114c74 | 41 | #include "buffer.h" |
42 | #include "bufaux.h" | |
42f11eb2 | 43 | #include "canohost.h" |
05114c74 | 44 | #include "log.h" |
45 | #include "monitor_wrap.h" | |
46 | #include "msg.h" | |
47 | #include "packet.h" | |
42f11eb2 | 48 | #include "readpass.h" |
05114c74 | 49 | #include "servconf.h" |
50 | #include "ssh2.h" | |
51 | #include "xmalloc.h" | |
5b9e2464 | 52 | #include "auth-options.h" |
a5c9cd31 | 53 | |
7fceb20d | 54 | extern ServerOptions options; |
55 | ||
05114c74 | 56 | #define __unused |
277f55cf | 57 | |
05114c74 | 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; | |
a5c9cd31 | 71 | |
05114c74 | 72 | static void |
73 | pthread_exit(void *value __unused) | |
74 | { | |
75 | _exit(0); | |
76 | } | |
5daf7064 | 77 | |
05114c74 | 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 | } | |
a5c9cd31 | 96 | |
05114c74 | 97 | static int |
98 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 99 | { |
05114c74 | 100 | return (kill(thread, SIGTERM)); |
8c9fe09e | 101 | } |
102 | ||
05114c74 | 103 | static int |
104 | pthread_join(sp_pthread_t thread, void **value __unused) | |
8c9fe09e | 105 | { |
05114c74 | 106 | int status; |
107 | ||
108 | waitpid(thread, &status, 0); | |
109 | return (status); | |
8c9fe09e | 110 | } |
05114c74 | 111 | #endif |
112 | ||
113 | ||
0a23d79f | 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; | |
05114c74 | 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 *); | |
c6630044 | 129 | static struct pam_ctxt *cleanup_ctxt; |
ad55cd03 | 130 | |
131 | /* | |
05114c74 | 132 | * Conversation function for authentication thread. |
ad55cd03 | 133 | */ |
05114c74 | 134 | static int |
5b9e2464 | 135 | sshpam_thread_conv(int n, const struct pam_message **msg, |
136 | struct pam_response **resp, void *data) | |
a5c9cd31 | 137 | { |
05114c74 | 138 | Buffer buffer; |
139 | struct pam_ctxt *ctxt; | |
0a23d79f | 140 | struct pam_response *reply; |
05114c74 | 141 | int i; |
142 | ||
0a23d79f | 143 | *resp = NULL; |
144 | ||
05114c74 | 145 | ctxt = data; |
146 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
147 | return (PAM_CONV_ERR); | |
0a23d79f | 148 | |
149 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
150 | return (PAM_CONV_ERR); | |
151 | memset(reply, 0, n * sizeof(*reply)); | |
152 | ||
05114c74 | 153 | buffer_init(&buffer); |
154 | for (i = 0; i < n; ++i) { | |
05114c74 | 155 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
156 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 157 | buffer_put_cstring(&buffer, |
158 | PAM_MSG_MEMBER(msg, i, msg)); | |
05114c74 | 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; | |
0a23d79f | 164 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 165 | break; |
166 | case PAM_PROMPT_ECHO_ON: | |
0a23d79f | 167 | buffer_put_cstring(&buffer, |
168 | PAM_MSG_MEMBER(msg, i, msg)); | |
05114c74 | 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; | |
0a23d79f | 174 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 175 | break; |
176 | case PAM_ERROR_MSG: | |
0a23d79f | 177 | buffer_put_cstring(&buffer, |
178 | PAM_MSG_MEMBER(msg, i, msg)); | |
05114c74 | 179 | ssh_msg_send(ctxt->pam_csock, |
180 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
181 | break; | |
182 | case PAM_TEXT_INFO: | |
0a23d79f | 183 | buffer_put_cstring(&buffer, |
184 | PAM_MSG_MEMBER(msg, i, msg)); | |
05114c74 | 185 | ssh_msg_send(ctxt->pam_csock, |
186 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer); | |
187 | break; | |
188 | default: | |
189 | goto fail; | |
a5c9cd31 | 190 | } |
05114c74 | 191 | buffer_clear(&buffer); |
a5c9cd31 | 192 | } |
05114c74 | 193 | buffer_free(&buffer); |
0a23d79f | 194 | *resp = reply; |
05114c74 | 195 | return (PAM_SUCCESS); |
0a23d79f | 196 | |
05114c74 | 197 | fail: |
0a23d79f | 198 | for(i = 0; i < n; i++) { |
199 | if (reply[i].resp != NULL) | |
200 | xfree(reply[i].resp); | |
201 | } | |
202 | xfree(reply); | |
05114c74 | 203 | buffer_free(&buffer); |
204 | return (PAM_CONV_ERR); | |
205 | } | |
a5c9cd31 | 206 | |
05114c74 | 207 | /* |
208 | * Authentication thread. | |
209 | */ | |
210 | static void * | |
211 | sshpam_thread(void *ctxtp) | |
212 | { | |
213 | struct pam_ctxt *ctxt = ctxtp; | |
214 | Buffer buffer; | |
c53917a9 | 215 | struct pam_conv sshpam_conv; |
05114c74 | 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 | |
a5c9cd31 | 222 | |
c53917a9 | 223 | sshpam_conv.conv = sshpam_thread_conv; |
224 | sshpam_conv.appdata_ptr = ctxt; | |
225 | ||
05114c74 | 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; | |
05114c74 | 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 */ | |
a5c9cd31 | 247 | } |
248 | ||
c6630044 | 249 | void |
250 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 251 | { |
c6630044 | 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 | } | |
05114c74 | 262 | } |
a5c9cd31 | 263 | |
05114c74 | 264 | static int |
5b9e2464 | 265 | sshpam_null_conv(int n, const struct pam_message **msg, |
266 | struct pam_response **resp, void *data) | |
05114c74 | 267 | { |
05114c74 | 268 | return (PAM_CONV_ERR); |
269 | } | |
a5c9cd31 | 270 | |
05114c74 | 271 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
272 | ||
c6630044 | 273 | void |
274 | sshpam_cleanup(void) | |
05114c74 | 275 | { |
05114c74 | 276 | debug("PAM: cleanup"); |
0a23d79f | 277 | if (sshpam_handle == NULL) |
278 | return; | |
05114c74 | 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; | |
a5c9cd31 | 287 | } |
05114c74 | 288 | sshpam_authenticated = sshpam_new_authtok_reqd = 0; |
289 | pam_end(sshpam_handle, sshpam_err); | |
290 | sshpam_handle = NULL; | |
a5c9cd31 | 291 | } |
292 | ||
05114c74 | 293 | static int |
294 | sshpam_init(const char *user) | |
a5c9cd31 | 295 | { |
05114c74 | 296 | extern u_int utmp_len; |
74678fb9 | 297 | extern char *__progname; |
05114c74 | 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); | |
05114c74 | 306 | pam_end(sshpam_handle, sshpam_err); |
307 | sshpam_handle = NULL; | |
308 | } | |
309 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 310 | sshpam_err = |
311 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); | |
5ff453c0 | 312 | if (sshpam_err != PAM_SUCCESS) { |
313 | pam_end(sshpam_handle, sshpam_err); | |
314 | sshpam_handle = NULL; | |
05114c74 | 315 | return (-1); |
5ff453c0 | 316 | } |
c5a7d788 | 317 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 318 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 319 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 320 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 321 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 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"); | |
05114c74 | 333 | if (sshpam_err != PAM_SUCCESS) { |
334 | pam_end(sshpam_handle, sshpam_err); | |
335 | sshpam_handle = NULL; | |
336 | return (-1); | |
a5c9cd31 | 337 | } |
5ff453c0 | 338 | #endif |
05114c74 | 339 | return (0); |
a5c9cd31 | 340 | } |
341 | ||
05114c74 | 342 | static void * |
343 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 344 | { |
05114c74 | 345 | struct pam_ctxt *ctxt; |
346 | int socks[2]; | |
2b87da3b | 347 | |
7fceb20d | 348 | /* Refuse to start if we don't have PAM enabled */ |
349 | if (!options.use_pam) | |
350 | return NULL; | |
351 | ||
05114c74 | 352 | /* Initialize PAM */ |
353 | if (sshpam_init(authctxt->user) == -1) { | |
354 | error("PAM: initialization failed"); | |
355 | return (NULL); | |
356 | } | |
5c377b3b | 357 | |
05114c74 | 358 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 359 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 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); | |
a5c9cd31 | 376 | } |
c6630044 | 377 | cleanup_ctxt = ctxt; |
05114c74 | 378 | return (ctxt); |
379 | } | |
a5c9cd31 | 380 | |
05114c74 | 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; | |
cbdeccf3 | 390 | size_t len; |
05114c74 | 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; | |
cbdeccf3 | 406 | len = plen + strlen(msg) + 1; |
407 | **prompts = xrealloc(**prompts, len); | |
408 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
05114c74 | 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 */ | |
cbdeccf3 | 415 | len = plen + strlen(msg) + 1; |
416 | **prompts = xrealloc(**prompts, len); | |
417 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
05114c74 | 418 | xfree(msg); |
5daf7064 | 419 | break; |
05114c74 | 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(); | |
e108cd93 | 430 | #endif |
05114c74 | 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); | |
e250770b | 442 | /* FALLTHROUGH */ |
5daf7064 | 443 | default: |
05114c74 | 444 | *num = 0; |
445 | **echo_on = 0; | |
446 | xfree(msg); | |
447 | ctxt->pam_done = -1; | |
448 | return (-1); | |
449 | } | |
a5c9cd31 | 450 | } |
05114c74 | 451 | return (-1); |
a5c9cd31 | 452 | } |
453 | ||
05114c74 | 454 | /* XXX - see also comment in auth-chall.c:verify_response */ |
455 | static int | |
456 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 457 | { |
05114c74 | 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); | |
a5c9cd31 | 470 | } |
05114c74 | 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); | |
a5c9cd31 | 480 | } |
481 | ||
05114c74 | 482 | static void |
483 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 484 | { |
05114c74 | 485 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 486 | |
c6630044 | 487 | sshpam_thread_cleanup(); |
05114c74 | 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 | */ | |
ad55cd03 | 495 | } |
496 | ||
05114c74 | 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 | }; | |
2919e060 | 512 | |
2b87da3b | 513 | /* |
05114c74 | 514 | * This replaces auth-pam.c |
ad55cd03 | 515 | */ |
05114c74 | 516 | void |
517 | start_pam(const char *user) | |
ad55cd03 | 518 | { |
817e6d38 | 519 | if (!options.use_pam) |
520 | fatal("PAM: initialisation requested when UsePAM=no"); | |
521 | ||
05114c74 | 522 | if (sshpam_init(user) == -1) |
523 | fatal("PAM: initialisation failed"); | |
a5c9cd31 | 524 | } |
525 | ||
05114c74 | 526 | void |
527 | finish_pam(void) | |
a5c9cd31 | 528 | { |
c6630044 | 529 | sshpam_cleanup(); |
a5c9cd31 | 530 | } |
531 | ||
5b9e2464 | 532 | u_int |
533 | do_pam_account(void) | |
a5c9cd31 | 534 | { |
5b9e2464 | 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 | ||
05114c74 | 550 | return (1); |
551 | } | |
46c76c63 | 552 | |
05114c74 | 553 | void |
49e82bb9 | 554 | do_pam_session(void) |
05114c74 | 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)); | |
49e82bb9 | 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 | { | |
26b3608b | 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 | } | |
05114c74 | 578 | } |
cbd7492e | 579 | |
05114c74 | 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)); | |
a5c9cd31 | 605 | } |
606 | ||
05114c74 | 607 | int |
608 | is_pam_password_change_required(void) | |
a5c9cd31 | 609 | { |
05114c74 | 610 | return (sshpam_new_authtok_reqd); |
a5c9cd31 | 611 | } |
612 | ||
05114c74 | 613 | static int |
5b9e2464 | 614 | pam_chauthtok_conv(int n, const struct pam_message **msg, |
615 | struct pam_response **resp, void *data) | |
ee48c949 | 616 | { |
05114c74 | 617 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 618 | struct pam_response *reply; |
ee48c949 | 619 | int i; |
620 | ||
0a23d79f | 621 | *resp = NULL; |
622 | ||
05114c74 | 623 | if (n <= 0 || n > PAM_MAX_NUM_MSG) |
624 | return (PAM_CONV_ERR); | |
0a23d79f | 625 | |
626 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
627 | return (PAM_CONV_ERR); | |
628 | memset(reply, 0, n * sizeof(*reply)); | |
629 | ||
05114c74 | 630 | for (i = 0; i < n; ++i) { |
631 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
632 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 633 | reply[i].resp = |
05114c74 | 634 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
635 | RP_ALLOW_STDIN); | |
0a23d79f | 636 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 637 | break; |
638 | case PAM_PROMPT_ECHO_ON: | |
639 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
640 | fgets(input, sizeof input, stdin); | |
0a23d79f | 641 | reply[i].resp = xstrdup(input); |
642 | reply[i].resp_retcode = PAM_SUCCESS; | |
05114c74 | 643 | break; |
644 | case PAM_ERROR_MSG: | |
645 | case PAM_TEXT_INFO: | |
646 | fputs(PAM_MSG_MEMBER(msg, i, msg), stderr); | |
0a23d79f | 647 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 648 | break; |
649 | default: | |
650 | goto fail; | |
651 | } | |
ee48c949 | 652 | } |
0a23d79f | 653 | *resp = reply; |
05114c74 | 654 | return (PAM_SUCCESS); |
0a23d79f | 655 | |
05114c74 | 656 | fail: |
0a23d79f | 657 | for(i = 0; i < n; i++) { |
658 | if (reply[i].resp != NULL) | |
659 | xfree(reply[i].resp); | |
660 | } | |
661 | xfree(reply); | |
05114c74 | 662 | return (PAM_CONV_ERR); |
ee48c949 | 663 | } |
664 | ||
05114c74 | 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) | |
a5c9cd31 | 671 | { |
c53917a9 | 672 | struct pam_conv pam_conv; |
673 | ||
674 | pam_conv.conv = pam_chauthtok_conv; | |
675 | pam_conv.appdata_ptr = NULL; | |
05114c74 | 676 | |
677 | if (use_privsep) | |
5b9e2464 | 678 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 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)); | |
5daf7064 | 689 | } |
690 | ||
749560dd | 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 | { | |
749560dd | 700 | int ret = 1; |
749560dd | 701 | #ifdef HAVE_PAM_PUTENV |
263c65df | 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); | |
749560dd | 711 | #endif |
263c65df | 712 | |
749560dd | 713 | return (ret); |
714 | } | |
715 | ||
05114c74 | 716 | void |
717 | print_pam_messages(void) | |
5daf7064 | 718 | { |
05114c74 | 719 | /* XXX */ |
720 | } | |
2b87da3b | 721 | |
05114c74 | 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 | } | |
5c377b3b | 732 | |
05114c74 | 733 | void |
734 | free_pam_environment(char **env) | |
735 | { | |
736 | char **envp; | |
5daf7064 | 737 | |
0eb6370a | 738 | if (env == NULL) |
739 | return; | |
740 | ||
05114c74 | 741 | for (envp = env; *envp; envp++) |
742 | xfree(*envp); | |
743 | xfree(env); | |
a5c9cd31 | 744 | } |
745 | ||
746 | #endif /* USE_PAM */ |