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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; |
3eaf3960 | 55 | extern Buffer loginmsg; |
b3ef7fb7 | 56 | extern int compat20; |
7fceb20d | 57 | |
05114c74 | 58 | #define __unused |
277f55cf | 59 | |
05114c74 | 60 | #ifdef USE_POSIX_THREADS |
61 | #include <pthread.h> | |
62 | /* | |
aff51935 | 63 | * Avoid namespace clash when *not* using pthreads for systems *with* |
64 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
05114c74 | 65 | * (e.g. Linux) |
66 | */ | |
aff51935 | 67 | typedef pthread_t sp_pthread_t; |
05114c74 | 68 | #else |
69 | /* | |
70 | * Simulate threads with processes. | |
71 | */ | |
72 | typedef pid_t sp_pthread_t; | |
a5c9cd31 | 73 | |
05114c74 | 74 | static void |
75 | pthread_exit(void *value __unused) | |
76 | { | |
77 | _exit(0); | |
78 | } | |
5daf7064 | 79 | |
05114c74 | 80 | static int |
81 | pthread_create(sp_pthread_t *thread, const void *attr __unused, | |
82 | void *(*thread_start)(void *), void *arg) | |
83 | { | |
84 | pid_t pid; | |
85 | ||
86 | switch ((pid = fork())) { | |
87 | case -1: | |
88 | error("fork(): %s", strerror(errno)); | |
89 | return (-1); | |
90 | case 0: | |
91 | thread_start(arg); | |
92 | _exit(1); | |
93 | default: | |
94 | *thread = pid; | |
95 | return (0); | |
96 | } | |
97 | } | |
a5c9cd31 | 98 | |
05114c74 | 99 | static int |
100 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 101 | { |
05114c74 | 102 | return (kill(thread, SIGTERM)); |
8c9fe09e | 103 | } |
104 | ||
05114c74 | 105 | static int |
106 | pthread_join(sp_pthread_t thread, void **value __unused) | |
8c9fe09e | 107 | { |
05114c74 | 108 | int status; |
109 | ||
110 | waitpid(thread, &status, 0); | |
111 | return (status); | |
8c9fe09e | 112 | } |
05114c74 | 113 | #endif |
114 | ||
115 | ||
0a23d79f | 116 | static pam_handle_t *sshpam_handle = NULL; |
117 | static int sshpam_err = 0; | |
118 | static int sshpam_authenticated = 0; | |
119 | static int sshpam_new_authtok_reqd = 0; | |
120 | static int sshpam_session_open = 0; | |
121 | static int sshpam_cred_established = 0; | |
b3ef7fb7 | 122 | static int sshpam_account_status = -1; |
2212fc98 | 123 | static char **sshpam_env = NULL; |
05114c74 | 124 | |
125 | struct pam_ctxt { | |
126 | sp_pthread_t pam_thread; | |
127 | int pam_psock; | |
128 | int pam_csock; | |
129 | int pam_done; | |
130 | }; | |
131 | ||
132 | static void sshpam_free_ctx(void *); | |
c6630044 | 133 | static struct pam_ctxt *cleanup_ctxt; |
ad55cd03 | 134 | |
2212fc98 | 135 | /* Some PAM implementations don't implement this */ |
136 | #ifndef HAVE_PAM_GETENVLIST | |
137 | static char ** | |
138 | pam_getenvlist(pam_handle_t *pamh) | |
139 | { | |
140 | /* | |
aff51935 | 141 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 142 | * for platforms without pam_getenvlist by searching for known |
143 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
144 | */ | |
145 | return NULL; | |
146 | } | |
147 | #endif | |
148 | ||
b3ef7fb7 | 149 | void |
150 | pam_password_change_required(int reqd) | |
151 | { | |
152 | sshpam_new_authtok_reqd = reqd; | |
153 | if (reqd) { | |
154 | no_port_forwarding_flag |= 2; | |
155 | no_agent_forwarding_flag |= 2; | |
156 | no_x11_forwarding_flag |= 2; | |
157 | } else { | |
158 | no_port_forwarding_flag &= ~2; | |
159 | no_agent_forwarding_flag &= ~2; | |
160 | no_x11_forwarding_flag &= ~2; | |
161 | ||
162 | } | |
163 | } | |
2212fc98 | 164 | /* Import regular and PAM environment from subprocess */ |
165 | static void | |
166 | import_environments(Buffer *b) | |
167 | { | |
168 | char *env; | |
169 | u_int i, num_env; | |
170 | int err; | |
171 | ||
b3ef7fb7 | 172 | /* Import variables set by do_pam_account */ |
173 | sshpam_account_status = buffer_get_int(b); | |
174 | pam_password_change_required(buffer_get_int(b)); | |
175 | ||
2212fc98 | 176 | /* Import environment from subprocess */ |
177 | num_env = buffer_get_int(b); | |
178 | sshpam_env = xmalloc((num_env + 1) * sizeof(*sshpam_env)); | |
179 | debug3("PAM: num env strings %d", num_env); | |
180 | for(i = 0; i < num_env; i++) | |
181 | sshpam_env[i] = buffer_get_string(b, NULL); | |
182 | ||
183 | sshpam_env[num_env] = NULL; | |
184 | ||
185 | /* Import PAM environment from subprocess */ | |
186 | num_env = buffer_get_int(b); | |
187 | debug("PAM: num PAM env strings %d", num_env); | |
188 | for(i = 0; i < num_env; i++) { | |
189 | env = buffer_get_string(b, NULL); | |
190 | ||
f79a6165 | 191 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 192 | /* Errors are not fatal here */ |
193 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
194 | error("PAM: pam_putenv: %s", | |
195 | pam_strerror(sshpam_handle, sshpam_err)); | |
196 | } | |
f79a6165 | 197 | #endif |
2212fc98 | 198 | } |
199 | } | |
200 | ||
ad55cd03 | 201 | /* |
05114c74 | 202 | * Conversation function for authentication thread. |
ad55cd03 | 203 | */ |
05114c74 | 204 | static int |
5b9e2464 | 205 | sshpam_thread_conv(int n, const struct pam_message **msg, |
206 | struct pam_response **resp, void *data) | |
a5c9cd31 | 207 | { |
05114c74 | 208 | Buffer buffer; |
209 | struct pam_ctxt *ctxt; | |
0a23d79f | 210 | struct pam_response *reply; |
05114c74 | 211 | int i; |
212 | ||
0a23d79f | 213 | *resp = NULL; |
214 | ||
05114c74 | 215 | ctxt = data; |
216 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
217 | return (PAM_CONV_ERR); | |
0a23d79f | 218 | |
219 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
220 | return (PAM_CONV_ERR); | |
221 | memset(reply, 0, n * sizeof(*reply)); | |
222 | ||
05114c74 | 223 | buffer_init(&buffer); |
224 | for (i = 0; i < n; ++i) { | |
05114c74 | 225 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
226 | case PAM_PROMPT_ECHO_OFF: | |
aff51935 | 227 | buffer_put_cstring(&buffer, |
0a23d79f | 228 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 229 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 230 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
231 | goto fail; | |
aff51935 | 232 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 233 | goto fail; |
05114c74 | 234 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
235 | goto fail; | |
0a23d79f | 236 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 237 | break; |
238 | case PAM_PROMPT_ECHO_ON: | |
aff51935 | 239 | buffer_put_cstring(&buffer, |
0a23d79f | 240 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 241 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 242 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
243 | goto fail; | |
244 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
245 | goto fail; | |
05114c74 | 246 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
247 | goto fail; | |
0a23d79f | 248 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 249 | break; |
250 | case PAM_ERROR_MSG: | |
aff51935 | 251 | buffer_put_cstring(&buffer, |
0a23d79f | 252 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 253 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 254 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
255 | goto fail; | |
05114c74 | 256 | break; |
257 | case PAM_TEXT_INFO: | |
aff51935 | 258 | buffer_put_cstring(&buffer, |
0a23d79f | 259 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 260 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 261 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
262 | goto fail; | |
05114c74 | 263 | break; |
264 | default: | |
265 | goto fail; | |
a5c9cd31 | 266 | } |
05114c74 | 267 | buffer_clear(&buffer); |
a5c9cd31 | 268 | } |
05114c74 | 269 | buffer_free(&buffer); |
0a23d79f | 270 | *resp = reply; |
05114c74 | 271 | return (PAM_SUCCESS); |
0a23d79f | 272 | |
05114c74 | 273 | fail: |
0a23d79f | 274 | for(i = 0; i < n; i++) { |
275 | if (reply[i].resp != NULL) | |
276 | xfree(reply[i].resp); | |
277 | } | |
278 | xfree(reply); | |
05114c74 | 279 | buffer_free(&buffer); |
280 | return (PAM_CONV_ERR); | |
281 | } | |
a5c9cd31 | 282 | |
05114c74 | 283 | /* |
284 | * Authentication thread. | |
285 | */ | |
286 | static void * | |
287 | sshpam_thread(void *ctxtp) | |
288 | { | |
289 | struct pam_ctxt *ctxt = ctxtp; | |
290 | Buffer buffer; | |
c53917a9 | 291 | struct pam_conv sshpam_conv; |
05114c74 | 292 | #ifndef USE_POSIX_THREADS |
2212fc98 | 293 | extern char **environ; |
294 | char **env_from_pam; | |
295 | u_int i; | |
05114c74 | 296 | const char *pam_user; |
297 | ||
298 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); | |
299 | setproctitle("%s [pam]", pam_user); | |
2212fc98 | 300 | environ[0] = NULL; |
05114c74 | 301 | #endif |
a5c9cd31 | 302 | |
c53917a9 | 303 | sshpam_conv.conv = sshpam_thread_conv; |
304 | sshpam_conv.appdata_ptr = ctxt; | |
305 | ||
05114c74 | 306 | buffer_init(&buffer); |
307 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
308 | (const void *)&sshpam_conv); | |
309 | if (sshpam_err != PAM_SUCCESS) | |
310 | goto auth_fail; | |
311 | sshpam_err = pam_authenticate(sshpam_handle, 0); | |
312 | if (sshpam_err != PAM_SUCCESS) | |
313 | goto auth_fail; | |
b3ef7fb7 | 314 | |
315 | /* if (compat20) { */ | |
316 | if (!do_pam_account()) | |
317 | goto auth_fail; | |
318 | if (sshpam_new_authtok_reqd) { | |
319 | sshpam_err = pam_chauthtok(sshpam_handle, | |
320 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
321 | if (sshpam_err != PAM_SUCCESS) | |
322 | goto auth_fail; | |
323 | pam_password_change_required(0); | |
324 | } | |
325 | /* } */ | |
326 | ||
05114c74 | 327 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 328 | |
329 | #ifndef USE_POSIX_THREADS | |
b3ef7fb7 | 330 | /* Export variables set by do_pam_account */ |
331 | buffer_put_int(&buffer, sshpam_account_status); | |
332 | buffer_put_int(&buffer, sshpam_new_authtok_reqd); | |
333 | ||
2212fc98 | 334 | /* Export any environment strings set in child */ |
335 | for(i = 0; environ[i] != NULL; i++) | |
336 | ; /* Count */ | |
337 | buffer_put_int(&buffer, i); | |
338 | for(i = 0; environ[i] != NULL; i++) | |
339 | buffer_put_cstring(&buffer, environ[i]); | |
340 | ||
341 | /* Export any environment strings set by PAM in child */ | |
342 | env_from_pam = pam_getenvlist(sshpam_handle); | |
343 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
344 | ; /* Count */ | |
345 | buffer_put_int(&buffer, i); | |
346 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
347 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
348 | #endif /* USE_POSIX_THREADS */ | |
349 | ||
7b2a0de3 | 350 | /* XXX - can't do much about an error here */ |
05114c74 | 351 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
352 | buffer_free(&buffer); | |
353 | pthread_exit(NULL); | |
354 | ||
355 | auth_fail: | |
356 | buffer_put_cstring(&buffer, | |
357 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 358 | /* XXX - can't do much about an error here */ |
05114c74 | 359 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); |
360 | buffer_free(&buffer); | |
361 | pthread_exit(NULL); | |
b6453d99 | 362 | |
05114c74 | 363 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 364 | } |
365 | ||
c6630044 | 366 | void |
367 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 368 | { |
c6630044 | 369 | struct pam_ctxt *ctxt = cleanup_ctxt; |
370 | ||
371 | if (ctxt != NULL && ctxt->pam_thread != 0) { | |
372 | pthread_cancel(ctxt->pam_thread); | |
373 | pthread_join(ctxt->pam_thread, NULL); | |
374 | close(ctxt->pam_psock); | |
375 | close(ctxt->pam_csock); | |
376 | memset(ctxt, 0, sizeof(*ctxt)); | |
377 | cleanup_ctxt = NULL; | |
378 | } | |
05114c74 | 379 | } |
a5c9cd31 | 380 | |
05114c74 | 381 | static int |
5b9e2464 | 382 | sshpam_null_conv(int n, const struct pam_message **msg, |
383 | struct pam_response **resp, void *data) | |
05114c74 | 384 | { |
05114c74 | 385 | return (PAM_CONV_ERR); |
386 | } | |
a5c9cd31 | 387 | |
05114c74 | 388 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
389 | ||
c6630044 | 390 | void |
391 | sshpam_cleanup(void) | |
05114c74 | 392 | { |
05114c74 | 393 | debug("PAM: cleanup"); |
0a23d79f | 394 | if (sshpam_handle == NULL) |
395 | return; | |
05114c74 | 396 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
397 | if (sshpam_cred_established) { | |
398 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
399 | sshpam_cred_established = 0; | |
400 | } | |
401 | if (sshpam_session_open) { | |
402 | pam_close_session(sshpam_handle, PAM_SILENT); | |
403 | sshpam_session_open = 0; | |
a5c9cd31 | 404 | } |
05114c74 | 405 | sshpam_authenticated = sshpam_new_authtok_reqd = 0; |
406 | pam_end(sshpam_handle, sshpam_err); | |
407 | sshpam_handle = NULL; | |
a5c9cd31 | 408 | } |
409 | ||
05114c74 | 410 | static int |
411 | sshpam_init(const char *user) | |
a5c9cd31 | 412 | { |
05114c74 | 413 | extern u_int utmp_len; |
74678fb9 | 414 | extern char *__progname; |
05114c74 | 415 | const char *pam_rhost, *pam_user; |
416 | ||
417 | if (sshpam_handle != NULL) { | |
418 | /* We already have a PAM context; check if the user matches */ | |
419 | sshpam_err = pam_get_item(sshpam_handle, | |
420 | PAM_USER, (const void **)&pam_user); | |
421 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) | |
422 | return (0); | |
05114c74 | 423 | pam_end(sshpam_handle, sshpam_err); |
424 | sshpam_handle = NULL; | |
425 | } | |
426 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 427 | sshpam_err = |
428 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); | |
5ff453c0 | 429 | if (sshpam_err != PAM_SUCCESS) { |
430 | pam_end(sshpam_handle, sshpam_err); | |
431 | sshpam_handle = NULL; | |
05114c74 | 432 | return (-1); |
5ff453c0 | 433 | } |
c5a7d788 | 434 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 435 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 436 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 437 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 438 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 439 | sshpam_handle = NULL; |
440 | return (-1); | |
441 | } | |
442 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 443 | /* |
444 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
445 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 446 | * may not even set one (for tty-less connections) |
aff51935 | 447 | */ |
5ff453c0 | 448 | debug("PAM: setting PAM_TTY to \"ssh\""); |
449 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 450 | if (sshpam_err != PAM_SUCCESS) { |
451 | pam_end(sshpam_handle, sshpam_err); | |
452 | sshpam_handle = NULL; | |
453 | return (-1); | |
a5c9cd31 | 454 | } |
5ff453c0 | 455 | #endif |
05114c74 | 456 | return (0); |
a5c9cd31 | 457 | } |
458 | ||
05114c74 | 459 | static void * |
460 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 461 | { |
05114c74 | 462 | struct pam_ctxt *ctxt; |
463 | int socks[2]; | |
2b87da3b | 464 | |
7fceb20d | 465 | /* Refuse to start if we don't have PAM enabled */ |
466 | if (!options.use_pam) | |
467 | return NULL; | |
468 | ||
05114c74 | 469 | /* Initialize PAM */ |
470 | if (sshpam_init(authctxt->user) == -1) { | |
471 | error("PAM: initialization failed"); | |
472 | return (NULL); | |
473 | } | |
5c377b3b | 474 | |
05114c74 | 475 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 476 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 477 | |
478 | /* Start the authentication thread */ | |
479 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
480 | error("PAM: failed create sockets: %s", strerror(errno)); | |
481 | xfree(ctxt); | |
482 | return (NULL); | |
483 | } | |
484 | ctxt->pam_psock = socks[0]; | |
485 | ctxt->pam_csock = socks[1]; | |
486 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
487 | error("PAM: failed to start authentication thread: %s", | |
488 | strerror(errno)); | |
489 | close(socks[0]); | |
490 | close(socks[1]); | |
491 | xfree(ctxt); | |
492 | return (NULL); | |
a5c9cd31 | 493 | } |
c6630044 | 494 | cleanup_ctxt = ctxt; |
05114c74 | 495 | return (ctxt); |
496 | } | |
a5c9cd31 | 497 | |
05114c74 | 498 | static int |
499 | sshpam_query(void *ctx, char **name, char **info, | |
500 | u_int *num, char ***prompts, u_int **echo_on) | |
501 | { | |
502 | Buffer buffer; | |
503 | struct pam_ctxt *ctxt = ctx; | |
504 | size_t plen; | |
505 | u_char type; | |
506 | char *msg; | |
cbdeccf3 | 507 | size_t len; |
05114c74 | 508 | |
509 | buffer_init(&buffer); | |
510 | *name = xstrdup(""); | |
511 | *info = xstrdup(""); | |
512 | *prompts = xmalloc(sizeof(char *)); | |
513 | **prompts = NULL; | |
514 | plen = 0; | |
515 | *echo_on = xmalloc(sizeof(u_int)); | |
516 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
517 | type = buffer_get_char(&buffer); | |
518 | msg = buffer_get_string(&buffer, NULL); | |
519 | switch (type) { | |
520 | case PAM_PROMPT_ECHO_ON: | |
521 | case PAM_PROMPT_ECHO_OFF: | |
522 | *num = 1; | |
cbdeccf3 | 523 | len = plen + strlen(msg) + 1; |
524 | **prompts = xrealloc(**prompts, len); | |
525 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
05114c74 | 526 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
527 | xfree(msg); | |
528 | return (0); | |
529 | case PAM_ERROR_MSG: | |
530 | case PAM_TEXT_INFO: | |
531 | /* accumulate messages */ | |
4f1b45b4 | 532 | len = plen + strlen(msg) + 2; |
cbdeccf3 | 533 | **prompts = xrealloc(**prompts, len); |
4f1b45b4 | 534 | plen += snprintf(**prompts + plen, len, "%s\n", msg); |
05114c74 | 535 | xfree(msg); |
5daf7064 | 536 | break; |
05114c74 | 537 | case PAM_SUCCESS: |
538 | case PAM_AUTH_ERR: | |
539 | if (**prompts != NULL) { | |
540 | /* drain any accumulated messages */ | |
3eaf3960 | 541 | debug("PAM: %s", **prompts); |
542 | buffer_append(&loginmsg, **prompts, | |
543 | strlen(**prompts)); | |
05114c74 | 544 | xfree(**prompts); |
545 | **prompts = NULL; | |
546 | } | |
547 | if (type == PAM_SUCCESS) { | |
2212fc98 | 548 | import_environments(&buffer); |
05114c74 | 549 | *num = 0; |
550 | **echo_on = 0; | |
551 | ctxt->pam_done = 1; | |
552 | xfree(msg); | |
553 | return (0); | |
554 | } | |
555 | error("PAM: %s", msg); | |
e250770b | 556 | /* FALLTHROUGH */ |
5daf7064 | 557 | default: |
05114c74 | 558 | *num = 0; |
559 | **echo_on = 0; | |
560 | xfree(msg); | |
561 | ctxt->pam_done = -1; | |
562 | return (-1); | |
563 | } | |
a5c9cd31 | 564 | } |
05114c74 | 565 | return (-1); |
a5c9cd31 | 566 | } |
567 | ||
05114c74 | 568 | /* XXX - see also comment in auth-chall.c:verify_response */ |
569 | static int | |
570 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 571 | { |
05114c74 | 572 | Buffer buffer; |
573 | struct pam_ctxt *ctxt = ctx; | |
574 | ||
575 | debug2("PAM: %s", __func__); | |
576 | switch (ctxt->pam_done) { | |
577 | case 1: | |
578 | sshpam_authenticated = 1; | |
579 | return (0); | |
580 | case 0: | |
581 | break; | |
582 | default: | |
583 | return (-1); | |
a5c9cd31 | 584 | } |
05114c74 | 585 | if (num != 1) { |
586 | error("PAM: expected one response, got %u", num); | |
587 | return (-1); | |
588 | } | |
589 | buffer_init(&buffer); | |
590 | buffer_put_cstring(&buffer, *resp); | |
7b2a0de3 | 591 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
592 | buffer_free(&buffer); | |
593 | return (-1); | |
594 | } | |
05114c74 | 595 | buffer_free(&buffer); |
596 | return (1); | |
a5c9cd31 | 597 | } |
598 | ||
05114c74 | 599 | static void |
600 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 601 | { |
05114c74 | 602 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 603 | |
c6630044 | 604 | sshpam_thread_cleanup(); |
05114c74 | 605 | xfree(ctxt); |
606 | /* | |
607 | * We don't call sshpam_cleanup() here because we may need the PAM | |
608 | * handle at a later stage, e.g. when setting up a session. It's | |
609 | * still on the cleanup list, so pam_end() *will* be called before | |
610 | * the server process terminates. | |
611 | */ | |
ad55cd03 | 612 | } |
613 | ||
05114c74 | 614 | KbdintDevice sshpam_device = { |
615 | "pam", | |
616 | sshpam_init_ctx, | |
617 | sshpam_query, | |
618 | sshpam_respond, | |
619 | sshpam_free_ctx | |
620 | }; | |
621 | ||
622 | KbdintDevice mm_sshpam_device = { | |
623 | "pam", | |
624 | mm_sshpam_init_ctx, | |
625 | mm_sshpam_query, | |
626 | mm_sshpam_respond, | |
627 | mm_sshpam_free_ctx | |
628 | }; | |
2919e060 | 629 | |
2b87da3b | 630 | /* |
05114c74 | 631 | * This replaces auth-pam.c |
ad55cd03 | 632 | */ |
05114c74 | 633 | void |
634 | start_pam(const char *user) | |
ad55cd03 | 635 | { |
817e6d38 | 636 | if (!options.use_pam) |
637 | fatal("PAM: initialisation requested when UsePAM=no"); | |
638 | ||
05114c74 | 639 | if (sshpam_init(user) == -1) |
640 | fatal("PAM: initialisation failed"); | |
a5c9cd31 | 641 | } |
642 | ||
05114c74 | 643 | void |
644 | finish_pam(void) | |
a5c9cd31 | 645 | { |
c6630044 | 646 | sshpam_cleanup(); |
a5c9cd31 | 647 | } |
648 | ||
5b9e2464 | 649 | u_int |
650 | do_pam_account(void) | |
a5c9cd31 | 651 | { |
b3ef7fb7 | 652 | if (sshpam_account_status != -1) |
653 | return (sshpam_account_status); | |
654 | ||
5b9e2464 | 655 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
656 | debug3("%s: pam_acct_mgmt = %d", __func__, sshpam_err); | |
b3ef7fb7 | 657 | |
658 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { | |
659 | sshpam_account_status = 0; | |
660 | return (sshpam_account_status); | |
5b9e2464 | 661 | } |
662 | ||
b3ef7fb7 | 663 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
664 | pam_password_change_required(1); | |
665 | ||
666 | sshpam_account_status = 1; | |
667 | return (sshpam_account_status); | |
05114c74 | 668 | } |
46c76c63 | 669 | |
49e82bb9 | 670 | void |
671 | do_pam_set_tty(const char *tty) | |
672 | { | |
26b3608b | 673 | if (tty != NULL) { |
674 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
675 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
676 | if (sshpam_err != PAM_SUCCESS) | |
677 | fatal("PAM: failed to set PAM_TTY: %s", | |
678 | pam_strerror(sshpam_handle, sshpam_err)); | |
679 | } | |
05114c74 | 680 | } |
cbd7492e | 681 | |
05114c74 | 682 | void |
683 | do_pam_setcred(int init) | |
684 | { | |
685 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
686 | (const void *)&null_conv); | |
687 | if (sshpam_err != PAM_SUCCESS) | |
688 | fatal("PAM: failed to set PAM_CONV: %s", | |
689 | pam_strerror(sshpam_handle, sshpam_err)); | |
690 | if (init) { | |
691 | debug("PAM: establishing credentials"); | |
692 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
693 | } else { | |
694 | debug("PAM: reinitializing credentials"); | |
695 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
696 | } | |
697 | if (sshpam_err == PAM_SUCCESS) { | |
698 | sshpam_cred_established = 1; | |
699 | return; | |
700 | } | |
701 | if (sshpam_authenticated) | |
702 | fatal("PAM: pam_setcred(): %s", | |
703 | pam_strerror(sshpam_handle, sshpam_err)); | |
704 | else | |
705 | debug("PAM: pam_setcred(): %s", | |
706 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 707 | } |
708 | ||
05114c74 | 709 | int |
710 | is_pam_password_change_required(void) | |
a5c9cd31 | 711 | { |
05114c74 | 712 | return (sshpam_new_authtok_reqd); |
a5c9cd31 | 713 | } |
714 | ||
05114c74 | 715 | static int |
3eaf3960 | 716 | pam_tty_conv(int n, const struct pam_message **msg, |
5b9e2464 | 717 | struct pam_response **resp, void *data) |
ee48c949 | 718 | { |
05114c74 | 719 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 720 | struct pam_response *reply; |
ee48c949 | 721 | int i; |
722 | ||
0a23d79f | 723 | *resp = NULL; |
724 | ||
3eaf3960 | 725 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 726 | return (PAM_CONV_ERR); |
0a23d79f | 727 | |
728 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
729 | return (PAM_CONV_ERR); | |
730 | memset(reply, 0, n * sizeof(*reply)); | |
731 | ||
05114c74 | 732 | for (i = 0; i < n; ++i) { |
733 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
734 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 735 | reply[i].resp = |
aff51935 | 736 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 737 | RP_ALLOW_STDIN); |
0a23d79f | 738 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 739 | break; |
740 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 741 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 742 | fgets(input, sizeof input, stdin); |
0a23d79f | 743 | reply[i].resp = xstrdup(input); |
744 | reply[i].resp_retcode = PAM_SUCCESS; | |
05114c74 | 745 | break; |
746 | case PAM_ERROR_MSG: | |
747 | case PAM_TEXT_INFO: | |
74117b26 | 748 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 749 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 750 | break; |
751 | default: | |
752 | goto fail; | |
753 | } | |
ee48c949 | 754 | } |
0a23d79f | 755 | *resp = reply; |
05114c74 | 756 | return (PAM_SUCCESS); |
0a23d79f | 757 | |
05114c74 | 758 | fail: |
0a23d79f | 759 | for(i = 0; i < n; i++) { |
760 | if (reply[i].resp != NULL) | |
761 | xfree(reply[i].resp); | |
762 | } | |
763 | xfree(reply); | |
05114c74 | 764 | return (PAM_CONV_ERR); |
ee48c949 | 765 | } |
766 | ||
3eaf3960 | 767 | static struct pam_conv tty_conv = { pam_tty_conv, NULL }; |
768 | ||
05114c74 | 769 | /* |
770 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
771 | * support that | |
772 | */ | |
773 | void | |
774 | do_pam_chauthtok(void) | |
a5c9cd31 | 775 | { |
05114c74 | 776 | if (use_privsep) |
5b9e2464 | 777 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 778 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 779 | (const void *)&tty_conv); |
05114c74 | 780 | if (sshpam_err != PAM_SUCCESS) |
781 | fatal("PAM: failed to set PAM_CONV: %s", | |
782 | pam_strerror(sshpam_handle, sshpam_err)); | |
783 | debug("PAM: changing password"); | |
784 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
785 | if (sshpam_err != PAM_SUCCESS) | |
786 | fatal("PAM: pam_chauthtok(): %s", | |
787 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 788 | } |
789 | ||
3eaf3960 | 790 | void |
791 | do_pam_session(void) | |
792 | { | |
aff51935 | 793 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 794 | (const void *)&tty_conv); |
795 | if (sshpam_err != PAM_SUCCESS) | |
796 | fatal("PAM: failed to set PAM_CONV: %s", | |
797 | pam_strerror(sshpam_handle, sshpam_err)); | |
798 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
799 | if (sshpam_err != PAM_SUCCESS) | |
800 | fatal("PAM: pam_open_session(): %s", | |
801 | pam_strerror(sshpam_handle, sshpam_err)); | |
802 | sshpam_session_open = 1; | |
803 | } | |
804 | ||
aff51935 | 805 | /* |
749560dd | 806 | * Set a PAM environment string. We need to do this so that the session |
807 | * modules can handle things like Kerberos/GSI credentials that appear | |
808 | * during the ssh authentication process. | |
809 | */ | |
749560dd | 810 | int |
aff51935 | 811 | do_pam_putenv(char *name, char *value) |
749560dd | 812 | { |
749560dd | 813 | int ret = 1; |
b6453d99 | 814 | #ifdef HAVE_PAM_PUTENV |
263c65df | 815 | char *compound; |
816 | size_t len; | |
817 | ||
818 | len = strlen(name) + strlen(value) + 2; | |
819 | compound = xmalloc(len); | |
820 | ||
821 | snprintf(compound, len, "%s=%s", name, value); | |
822 | ret = pam_putenv(sshpam_handle, compound); | |
823 | xfree(compound); | |
749560dd | 824 | #endif |
263c65df | 825 | |
749560dd | 826 | return (ret); |
827 | } | |
828 | ||
05114c74 | 829 | void |
830 | print_pam_messages(void) | |
5daf7064 | 831 | { |
05114c74 | 832 | /* XXX */ |
833 | } | |
2b87da3b | 834 | |
2212fc98 | 835 | char ** |
836 | fetch_pam_child_environment(void) | |
837 | { | |
838 | return sshpam_env; | |
839 | } | |
840 | ||
05114c74 | 841 | char ** |
842 | fetch_pam_environment(void) | |
843 | { | |
05114c74 | 844 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 845 | } |
5c377b3b | 846 | |
05114c74 | 847 | void |
848 | free_pam_environment(char **env) | |
849 | { | |
850 | char **envp; | |
5daf7064 | 851 | |
0eb6370a | 852 | if (env == NULL) |
853 | return; | |
854 | ||
05114c74 | 855 | for (envp = env; *envp; envp++) |
856 | xfree(*envp); | |
857 | xfree(env); | |
a5c9cd31 | 858 | } |
859 | ||
860 | #endif /* USE_PAM */ |