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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 | |
2511d104 | 37 | #if defined(HAVE_SECURITY_PAM_APPL_H) |
05114c74 | 38 | #include <security/pam_appl.h> |
2511d104 | 39 | #elif defined (HAVE_PAM_PAM_APPL_H) |
40 | #include <pam/pam_appl.h> | |
41 | #endif | |
05114c74 | 42 | |
fde58bd4 | 43 | #include "auth.h" |
5c377b3b | 44 | #include "auth-pam.h" |
05114c74 | 45 | #include "buffer.h" |
46 | #include "bufaux.h" | |
42f11eb2 | 47 | #include "canohost.h" |
05114c74 | 48 | #include "log.h" |
49 | #include "monitor_wrap.h" | |
50 | #include "msg.h" | |
51 | #include "packet.h" | |
0f3ee929 | 52 | #include "misc.h" |
05114c74 | 53 | #include "servconf.h" |
54 | #include "ssh2.h" | |
55 | #include "xmalloc.h" | |
5b9e2464 | 56 | #include "auth-options.h" |
a5c9cd31 | 57 | |
7fceb20d | 58 | extern ServerOptions options; |
3eaf3960 | 59 | extern Buffer loginmsg; |
b3ef7fb7 | 60 | extern int compat20; |
1e08e787 | 61 | extern u_int utmp_len; |
7fceb20d | 62 | |
05114c74 | 63 | #ifdef USE_POSIX_THREADS |
64 | #include <pthread.h> | |
65 | /* | |
aff51935 | 66 | * Avoid namespace clash when *not* using pthreads for systems *with* |
67 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
05114c74 | 68 | * (e.g. Linux) |
69 | */ | |
aff51935 | 70 | typedef pthread_t sp_pthread_t; |
05114c74 | 71 | #else |
e47e681f | 72 | typedef pid_t sp_pthread_t; |
73 | #endif | |
74 | ||
75 | struct pam_ctxt { | |
76 | sp_pthread_t pam_thread; | |
77 | int pam_psock; | |
78 | int pam_csock; | |
79 | int pam_done; | |
80 | }; | |
81 | ||
82 | static void sshpam_free_ctx(void *); | |
83 | static struct pam_ctxt *cleanup_ctxt; | |
84 | ||
85 | #ifndef USE_POSIX_THREADS | |
05114c74 | 86 | /* |
87 | * Simulate threads with processes. | |
88 | */ | |
a5c9cd31 | 89 | |
100e6910 | 90 | static int sshpam_thread_status = -1; |
91 | static mysig_t sshpam_oldsig; | |
92 | ||
93 | static void | |
94 | sshpam_sigchld_handler(int sig) | |
95 | { | |
8a956cda | 96 | signal(SIGCHLD, SIG_DFL); |
28b49ff8 | 97 | if (cleanup_ctxt == NULL) |
98 | return; /* handler called after PAM cleanup, shouldn't happen */ | |
8a956cda | 99 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG) |
100 | == -1) { | |
101 | /* PAM thread has not exitted, privsep slave must have */ | |
102 | kill(cleanup_ctxt->pam_thread, SIGTERM); | |
103 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) | |
104 | == -1) | |
105 | return; /* could not wait */ | |
106 | } | |
100e6910 | 107 | if (WIFSIGNALED(sshpam_thread_status) && |
108 | WTERMSIG(sshpam_thread_status) == SIGTERM) | |
109 | return; /* terminated by pthread_cancel */ | |
110 | if (!WIFEXITED(sshpam_thread_status)) | |
111 | fatal("PAM: authentication thread exited unexpectedly"); | |
112 | if (WEXITSTATUS(sshpam_thread_status) != 0) | |
113 | fatal("PAM: authentication thread exited uncleanly"); | |
114 | } | |
115 | ||
05114c74 | 116 | static void |
117 | pthread_exit(void *value __unused) | |
118 | { | |
119 | _exit(0); | |
120 | } | |
5daf7064 | 121 | |
05114c74 | 122 | static int |
123 | pthread_create(sp_pthread_t *thread, const void *attr __unused, | |
124 | void *(*thread_start)(void *), void *arg) | |
125 | { | |
126 | pid_t pid; | |
127 | ||
355fbf31 | 128 | sshpam_thread_status = -1; |
05114c74 | 129 | switch ((pid = fork())) { |
130 | case -1: | |
131 | error("fork(): %s", strerror(errno)); | |
132 | return (-1); | |
133 | case 0: | |
134 | thread_start(arg); | |
135 | _exit(1); | |
136 | default: | |
137 | *thread = pid; | |
100e6910 | 138 | sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); |
05114c74 | 139 | return (0); |
140 | } | |
141 | } | |
a5c9cd31 | 142 | |
05114c74 | 143 | static int |
144 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 145 | { |
28b49ff8 | 146 | signal(SIGCHLD, sshpam_oldsig); |
05114c74 | 147 | return (kill(thread, SIGTERM)); |
8c9fe09e | 148 | } |
149 | ||
05114c74 | 150 | static int |
151 | pthread_join(sp_pthread_t thread, void **value __unused) | |
8c9fe09e | 152 | { |
05114c74 | 153 | int status; |
154 | ||
100e6910 | 155 | if (sshpam_thread_status != -1) |
156 | return (sshpam_thread_status); | |
157 | signal(SIGCHLD, sshpam_oldsig); | |
05114c74 | 158 | waitpid(thread, &status, 0); |
159 | return (status); | |
8c9fe09e | 160 | } |
05114c74 | 161 | #endif |
162 | ||
163 | ||
0a23d79f | 164 | static pam_handle_t *sshpam_handle = NULL; |
165 | static int sshpam_err = 0; | |
166 | static int sshpam_authenticated = 0; | |
0a23d79f | 167 | static int sshpam_session_open = 0; |
168 | static int sshpam_cred_established = 0; | |
b3ef7fb7 | 169 | static int sshpam_account_status = -1; |
2212fc98 | 170 | static char **sshpam_env = NULL; |
d948154a | 171 | static Authctxt *sshpam_authctxt = NULL; |
5de92f17 | 172 | static const char *sshpam_password = NULL; |
05114c74 | 173 | |
2212fc98 | 174 | /* Some PAM implementations don't implement this */ |
175 | #ifndef HAVE_PAM_GETENVLIST | |
176 | static char ** | |
177 | pam_getenvlist(pam_handle_t *pamh) | |
178 | { | |
179 | /* | |
aff51935 | 180 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 181 | * for platforms without pam_getenvlist by searching for known |
182 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
183 | */ | |
184 | return NULL; | |
185 | } | |
186 | #endif | |
187 | ||
b3ef7fb7 | 188 | void |
189 | pam_password_change_required(int reqd) | |
190 | { | |
90f3c272 | 191 | debug3("%s %d", __func__, reqd); |
d948154a | 192 | if (sshpam_authctxt == NULL) |
529d73ab | 193 | fatal("%s: PAM authctxt not initialized", __func__); |
d948154a | 194 | sshpam_authctxt->force_pwchange = reqd; |
b3ef7fb7 | 195 | if (reqd) { |
196 | no_port_forwarding_flag |= 2; | |
197 | no_agent_forwarding_flag |= 2; | |
198 | no_x11_forwarding_flag |= 2; | |
199 | } else { | |
200 | no_port_forwarding_flag &= ~2; | |
201 | no_agent_forwarding_flag &= ~2; | |
202 | no_x11_forwarding_flag &= ~2; | |
b3ef7fb7 | 203 | } |
204 | } | |
dd1fb864 | 205 | |
2212fc98 | 206 | /* Import regular and PAM environment from subprocess */ |
207 | static void | |
208 | import_environments(Buffer *b) | |
209 | { | |
210 | char *env; | |
211 | u_int i, num_env; | |
212 | int err; | |
213 | ||
90f3c272 | 214 | debug3("PAM: %s entering", __func__); |
215 | ||
a1e0095d | 216 | #ifndef USE_POSIX_THREADS |
b3ef7fb7 | 217 | /* Import variables set by do_pam_account */ |
218 | sshpam_account_status = buffer_get_int(b); | |
219 | pam_password_change_required(buffer_get_int(b)); | |
220 | ||
2212fc98 | 221 | /* Import environment from subprocess */ |
222 | num_env = buffer_get_int(b); | |
223 | sshpam_env = xmalloc((num_env + 1) * sizeof(*sshpam_env)); | |
224 | debug3("PAM: num env strings %d", num_env); | |
225 | for(i = 0; i < num_env; i++) | |
226 | sshpam_env[i] = buffer_get_string(b, NULL); | |
227 | ||
228 | sshpam_env[num_env] = NULL; | |
229 | ||
230 | /* Import PAM environment from subprocess */ | |
231 | num_env = buffer_get_int(b); | |
232 | debug("PAM: num PAM env strings %d", num_env); | |
233 | for(i = 0; i < num_env; i++) { | |
234 | env = buffer_get_string(b, NULL); | |
235 | ||
f79a6165 | 236 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 237 | /* Errors are not fatal here */ |
238 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
239 | error("PAM: pam_putenv: %s", | |
240 | pam_strerror(sshpam_handle, sshpam_err)); | |
241 | } | |
f79a6165 | 242 | #endif |
2212fc98 | 243 | } |
a1e0095d | 244 | #endif |
2212fc98 | 245 | } |
246 | ||
ad55cd03 | 247 | /* |
05114c74 | 248 | * Conversation function for authentication thread. |
ad55cd03 | 249 | */ |
05114c74 | 250 | static int |
5b9e2464 | 251 | sshpam_thread_conv(int n, const struct pam_message **msg, |
252 | struct pam_response **resp, void *data) | |
a5c9cd31 | 253 | { |
05114c74 | 254 | Buffer buffer; |
255 | struct pam_ctxt *ctxt; | |
0a23d79f | 256 | struct pam_response *reply; |
05114c74 | 257 | int i; |
258 | ||
60922169 | 259 | debug3("PAM: %s entering, %d messages", __func__, n); |
0a23d79f | 260 | *resp = NULL; |
261 | ||
05114c74 | 262 | ctxt = data; |
263 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
264 | return (PAM_CONV_ERR); | |
0a23d79f | 265 | |
266 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
267 | return (PAM_CONV_ERR); | |
268 | memset(reply, 0, n * sizeof(*reply)); | |
269 | ||
05114c74 | 270 | buffer_init(&buffer); |
271 | for (i = 0; i < n; ++i) { | |
05114c74 | 272 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
273 | case PAM_PROMPT_ECHO_OFF: | |
aff51935 | 274 | buffer_put_cstring(&buffer, |
0a23d79f | 275 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 276 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 277 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
278 | goto fail; | |
aff51935 | 279 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 280 | goto fail; |
05114c74 | 281 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
282 | goto fail; | |
0a23d79f | 283 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 284 | break; |
285 | case PAM_PROMPT_ECHO_ON: | |
aff51935 | 286 | buffer_put_cstring(&buffer, |
0a23d79f | 287 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 288 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 289 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
290 | goto fail; | |
291 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
292 | goto fail; | |
05114c74 | 293 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
294 | goto fail; | |
0a23d79f | 295 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 296 | break; |
297 | case PAM_ERROR_MSG: | |
aff51935 | 298 | buffer_put_cstring(&buffer, |
0a23d79f | 299 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 300 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 301 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
302 | goto fail; | |
05114c74 | 303 | break; |
304 | case PAM_TEXT_INFO: | |
aff51935 | 305 | buffer_put_cstring(&buffer, |
0a23d79f | 306 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 307 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 308 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
309 | goto fail; | |
05114c74 | 310 | break; |
311 | default: | |
312 | goto fail; | |
a5c9cd31 | 313 | } |
05114c74 | 314 | buffer_clear(&buffer); |
a5c9cd31 | 315 | } |
05114c74 | 316 | buffer_free(&buffer); |
0a23d79f | 317 | *resp = reply; |
05114c74 | 318 | return (PAM_SUCCESS); |
0a23d79f | 319 | |
05114c74 | 320 | fail: |
0a23d79f | 321 | for(i = 0; i < n; i++) { |
322 | if (reply[i].resp != NULL) | |
323 | xfree(reply[i].resp); | |
324 | } | |
325 | xfree(reply); | |
05114c74 | 326 | buffer_free(&buffer); |
327 | return (PAM_CONV_ERR); | |
328 | } | |
a5c9cd31 | 329 | |
05114c74 | 330 | /* |
331 | * Authentication thread. | |
332 | */ | |
333 | static void * | |
334 | sshpam_thread(void *ctxtp) | |
335 | { | |
336 | struct pam_ctxt *ctxt = ctxtp; | |
337 | Buffer buffer; | |
c53917a9 | 338 | struct pam_conv sshpam_conv; |
05114c74 | 339 | #ifndef USE_POSIX_THREADS |
2212fc98 | 340 | extern char **environ; |
341 | char **env_from_pam; | |
342 | u_int i; | |
05114c74 | 343 | const char *pam_user; |
344 | ||
345 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); | |
346 | setproctitle("%s [pam]", pam_user); | |
2212fc98 | 347 | environ[0] = NULL; |
05114c74 | 348 | #endif |
a5c9cd31 | 349 | |
c53917a9 | 350 | sshpam_conv.conv = sshpam_thread_conv; |
351 | sshpam_conv.appdata_ptr = ctxt; | |
352 | ||
d948154a | 353 | if (sshpam_authctxt == NULL) |
529d73ab | 354 | fatal("%s: PAM authctxt not initialized", __func__); |
355 | ||
05114c74 | 356 | buffer_init(&buffer); |
357 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
358 | (const void *)&sshpam_conv); | |
359 | if (sshpam_err != PAM_SUCCESS) | |
360 | goto auth_fail; | |
361 | sshpam_err = pam_authenticate(sshpam_handle, 0); | |
362 | if (sshpam_err != PAM_SUCCESS) | |
363 | goto auth_fail; | |
b3ef7fb7 | 364 | |
2935db92 | 365 | if (compat20) { |
b3ef7fb7 | 366 | if (!do_pam_account()) |
367 | goto auth_fail; | |
d948154a | 368 | if (sshpam_authctxt->force_pwchange) { |
b3ef7fb7 | 369 | sshpam_err = pam_chauthtok(sshpam_handle, |
370 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
371 | if (sshpam_err != PAM_SUCCESS) | |
372 | goto auth_fail; | |
373 | pam_password_change_required(0); | |
374 | } | |
2935db92 | 375 | } |
b3ef7fb7 | 376 | |
05114c74 | 377 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 378 | |
379 | #ifndef USE_POSIX_THREADS | |
b3ef7fb7 | 380 | /* Export variables set by do_pam_account */ |
381 | buffer_put_int(&buffer, sshpam_account_status); | |
d948154a | 382 | buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); |
b3ef7fb7 | 383 | |
2212fc98 | 384 | /* Export any environment strings set in child */ |
385 | for(i = 0; environ[i] != NULL; i++) | |
386 | ; /* Count */ | |
387 | buffer_put_int(&buffer, i); | |
388 | for(i = 0; environ[i] != NULL; i++) | |
389 | buffer_put_cstring(&buffer, environ[i]); | |
390 | ||
391 | /* Export any environment strings set by PAM in child */ | |
392 | env_from_pam = pam_getenvlist(sshpam_handle); | |
393 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
394 | ; /* Count */ | |
395 | buffer_put_int(&buffer, i); | |
396 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
397 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
398 | #endif /* USE_POSIX_THREADS */ | |
399 | ||
7b2a0de3 | 400 | /* XXX - can't do much about an error here */ |
05114c74 | 401 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
402 | buffer_free(&buffer); | |
403 | pthread_exit(NULL); | |
404 | ||
405 | auth_fail: | |
406 | buffer_put_cstring(&buffer, | |
407 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 408 | /* XXX - can't do much about an error here */ |
05114c74 | 409 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); |
410 | buffer_free(&buffer); | |
411 | pthread_exit(NULL); | |
b6453d99 | 412 | |
05114c74 | 413 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 414 | } |
415 | ||
c6630044 | 416 | void |
417 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 418 | { |
c6630044 | 419 | struct pam_ctxt *ctxt = cleanup_ctxt; |
420 | ||
90f3c272 | 421 | debug3("PAM: %s entering", __func__); |
c6630044 | 422 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
423 | pthread_cancel(ctxt->pam_thread); | |
424 | pthread_join(ctxt->pam_thread, NULL); | |
425 | close(ctxt->pam_psock); | |
426 | close(ctxt->pam_csock); | |
427 | memset(ctxt, 0, sizeof(*ctxt)); | |
428 | cleanup_ctxt = NULL; | |
429 | } | |
05114c74 | 430 | } |
a5c9cd31 | 431 | |
05114c74 | 432 | static int |
5b9e2464 | 433 | sshpam_null_conv(int n, const struct pam_message **msg, |
434 | struct pam_response **resp, void *data) | |
05114c74 | 435 | { |
60922169 | 436 | debug3("PAM: %s entering, %d messages", __func__, n); |
05114c74 | 437 | return (PAM_CONV_ERR); |
438 | } | |
a5c9cd31 | 439 | |
05114c74 | 440 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
441 | ||
c6630044 | 442 | void |
443 | sshpam_cleanup(void) | |
05114c74 | 444 | { |
05114c74 | 445 | debug("PAM: cleanup"); |
0a23d79f | 446 | if (sshpam_handle == NULL) |
447 | return; | |
05114c74 | 448 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
449 | if (sshpam_cred_established) { | |
450 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
451 | sshpam_cred_established = 0; | |
452 | } | |
453 | if (sshpam_session_open) { | |
454 | pam_close_session(sshpam_handle, PAM_SILENT); | |
455 | sshpam_session_open = 0; | |
a5c9cd31 | 456 | } |
dd1fb864 | 457 | sshpam_authenticated = 0; |
05114c74 | 458 | pam_end(sshpam_handle, sshpam_err); |
459 | sshpam_handle = NULL; | |
a5c9cd31 | 460 | } |
461 | ||
05114c74 | 462 | static int |
529d73ab | 463 | sshpam_init(Authctxt *authctxt) |
a5c9cd31 | 464 | { |
74678fb9 | 465 | extern char *__progname; |
529d73ab | 466 | const char *pam_rhost, *pam_user, *user = authctxt->user; |
05114c74 | 467 | |
468 | if (sshpam_handle != NULL) { | |
469 | /* We already have a PAM context; check if the user matches */ | |
470 | sshpam_err = pam_get_item(sshpam_handle, | |
471 | PAM_USER, (const void **)&pam_user); | |
472 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) | |
473 | return (0); | |
05114c74 | 474 | pam_end(sshpam_handle, sshpam_err); |
475 | sshpam_handle = NULL; | |
476 | } | |
477 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 478 | sshpam_err = |
479 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); | |
d948154a | 480 | sshpam_authctxt = authctxt; |
529d73ab | 481 | |
5ff453c0 | 482 | if (sshpam_err != PAM_SUCCESS) { |
483 | pam_end(sshpam_handle, sshpam_err); | |
484 | sshpam_handle = NULL; | |
05114c74 | 485 | return (-1); |
5ff453c0 | 486 | } |
c5a7d788 | 487 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 488 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 489 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 490 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 491 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 492 | sshpam_handle = NULL; |
493 | return (-1); | |
494 | } | |
495 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 496 | /* |
497 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
498 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 499 | * may not even set one (for tty-less connections) |
aff51935 | 500 | */ |
5ff453c0 | 501 | debug("PAM: setting PAM_TTY to \"ssh\""); |
502 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 503 | if (sshpam_err != PAM_SUCCESS) { |
504 | pam_end(sshpam_handle, sshpam_err); | |
505 | sshpam_handle = NULL; | |
506 | return (-1); | |
a5c9cd31 | 507 | } |
5ff453c0 | 508 | #endif |
05114c74 | 509 | return (0); |
a5c9cd31 | 510 | } |
511 | ||
05114c74 | 512 | static void * |
513 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 514 | { |
05114c74 | 515 | struct pam_ctxt *ctxt; |
516 | int socks[2]; | |
2b87da3b | 517 | |
90f3c272 | 518 | debug3("PAM: %s entering", __func__); |
7fceb20d | 519 | /* Refuse to start if we don't have PAM enabled */ |
520 | if (!options.use_pam) | |
521 | return NULL; | |
522 | ||
05114c74 | 523 | /* Initialize PAM */ |
529d73ab | 524 | if (sshpam_init(authctxt) == -1) { |
05114c74 | 525 | error("PAM: initialization failed"); |
526 | return (NULL); | |
527 | } | |
5c377b3b | 528 | |
05114c74 | 529 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 530 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 531 | |
532 | /* Start the authentication thread */ | |
533 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
534 | error("PAM: failed create sockets: %s", strerror(errno)); | |
535 | xfree(ctxt); | |
536 | return (NULL); | |
537 | } | |
538 | ctxt->pam_psock = socks[0]; | |
539 | ctxt->pam_csock = socks[1]; | |
540 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
541 | error("PAM: failed to start authentication thread: %s", | |
542 | strerror(errno)); | |
543 | close(socks[0]); | |
544 | close(socks[1]); | |
545 | xfree(ctxt); | |
546 | return (NULL); | |
a5c9cd31 | 547 | } |
c6630044 | 548 | cleanup_ctxt = ctxt; |
05114c74 | 549 | return (ctxt); |
550 | } | |
a5c9cd31 | 551 | |
05114c74 | 552 | static int |
553 | sshpam_query(void *ctx, char **name, char **info, | |
554 | u_int *num, char ***prompts, u_int **echo_on) | |
555 | { | |
556 | Buffer buffer; | |
557 | struct pam_ctxt *ctxt = ctx; | |
558 | size_t plen; | |
559 | u_char type; | |
560 | char *msg; | |
cbdeccf3 | 561 | size_t len; |
05114c74 | 562 | |
90f3c272 | 563 | debug3("PAM: %s entering", __func__); |
05114c74 | 564 | buffer_init(&buffer); |
565 | *name = xstrdup(""); | |
566 | *info = xstrdup(""); | |
567 | *prompts = xmalloc(sizeof(char *)); | |
568 | **prompts = NULL; | |
569 | plen = 0; | |
570 | *echo_on = xmalloc(sizeof(u_int)); | |
571 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
572 | type = buffer_get_char(&buffer); | |
573 | msg = buffer_get_string(&buffer, NULL); | |
574 | switch (type) { | |
575 | case PAM_PROMPT_ECHO_ON: | |
576 | case PAM_PROMPT_ECHO_OFF: | |
577 | *num = 1; | |
cbdeccf3 | 578 | len = plen + strlen(msg) + 1; |
579 | **prompts = xrealloc(**prompts, len); | |
580 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
05114c74 | 581 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
582 | xfree(msg); | |
583 | return (0); | |
584 | case PAM_ERROR_MSG: | |
585 | case PAM_TEXT_INFO: | |
586 | /* accumulate messages */ | |
4f1b45b4 | 587 | len = plen + strlen(msg) + 2; |
cbdeccf3 | 588 | **prompts = xrealloc(**prompts, len); |
4f1b45b4 | 589 | plen += snprintf(**prompts + plen, len, "%s\n", msg); |
05114c74 | 590 | xfree(msg); |
5daf7064 | 591 | break; |
05114c74 | 592 | case PAM_SUCCESS: |
593 | case PAM_AUTH_ERR: | |
594 | if (**prompts != NULL) { | |
595 | /* drain any accumulated messages */ | |
3eaf3960 | 596 | debug("PAM: %s", **prompts); |
597 | buffer_append(&loginmsg, **prompts, | |
598 | strlen(**prompts)); | |
05114c74 | 599 | xfree(**prompts); |
600 | **prompts = NULL; | |
601 | } | |
602 | if (type == PAM_SUCCESS) { | |
2212fc98 | 603 | import_environments(&buffer); |
05114c74 | 604 | *num = 0; |
605 | **echo_on = 0; | |
606 | ctxt->pam_done = 1; | |
607 | xfree(msg); | |
608 | return (0); | |
609 | } | |
1e08e787 | 610 | error("PAM: %s for %s%.100s from %.100s", msg, |
611 | sshpam_authctxt->valid ? "" : "illegal user ", | |
612 | sshpam_authctxt->user, | |
613 | get_remote_name_or_ip(utmp_len, options.use_dns)); | |
e250770b | 614 | /* FALLTHROUGH */ |
5daf7064 | 615 | default: |
05114c74 | 616 | *num = 0; |
617 | **echo_on = 0; | |
618 | xfree(msg); | |
619 | ctxt->pam_done = -1; | |
620 | return (-1); | |
621 | } | |
a5c9cd31 | 622 | } |
05114c74 | 623 | return (-1); |
a5c9cd31 | 624 | } |
625 | ||
05114c74 | 626 | /* XXX - see also comment in auth-chall.c:verify_response */ |
627 | static int | |
628 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 629 | { |
05114c74 | 630 | Buffer buffer; |
631 | struct pam_ctxt *ctxt = ctx; | |
632 | ||
90f3c272 | 633 | debug2("PAM: %s entering, %d responses", __func__, num); |
05114c74 | 634 | switch (ctxt->pam_done) { |
635 | case 1: | |
636 | sshpam_authenticated = 1; | |
637 | return (0); | |
638 | case 0: | |
639 | break; | |
640 | default: | |
641 | return (-1); | |
a5c9cd31 | 642 | } |
05114c74 | 643 | if (num != 1) { |
644 | error("PAM: expected one response, got %u", num); | |
645 | return (-1); | |
646 | } | |
647 | buffer_init(&buffer); | |
648 | buffer_put_cstring(&buffer, *resp); | |
7b2a0de3 | 649 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
650 | buffer_free(&buffer); | |
651 | return (-1); | |
652 | } | |
05114c74 | 653 | buffer_free(&buffer); |
654 | return (1); | |
a5c9cd31 | 655 | } |
656 | ||
05114c74 | 657 | static void |
658 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 659 | { |
05114c74 | 660 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 661 | |
90f3c272 | 662 | debug3("PAM: %s entering", __func__); |
c6630044 | 663 | sshpam_thread_cleanup(); |
05114c74 | 664 | xfree(ctxt); |
665 | /* | |
666 | * We don't call sshpam_cleanup() here because we may need the PAM | |
667 | * handle at a later stage, e.g. when setting up a session. It's | |
668 | * still on the cleanup list, so pam_end() *will* be called before | |
669 | * the server process terminates. | |
670 | */ | |
ad55cd03 | 671 | } |
672 | ||
05114c74 | 673 | KbdintDevice sshpam_device = { |
674 | "pam", | |
675 | sshpam_init_ctx, | |
676 | sshpam_query, | |
677 | sshpam_respond, | |
678 | sshpam_free_ctx | |
679 | }; | |
680 | ||
681 | KbdintDevice mm_sshpam_device = { | |
682 | "pam", | |
683 | mm_sshpam_init_ctx, | |
684 | mm_sshpam_query, | |
685 | mm_sshpam_respond, | |
686 | mm_sshpam_free_ctx | |
687 | }; | |
2919e060 | 688 | |
2b87da3b | 689 | /* |
05114c74 | 690 | * This replaces auth-pam.c |
ad55cd03 | 691 | */ |
05114c74 | 692 | void |
529d73ab | 693 | start_pam(Authctxt *authctxt) |
ad55cd03 | 694 | { |
817e6d38 | 695 | if (!options.use_pam) |
696 | fatal("PAM: initialisation requested when UsePAM=no"); | |
697 | ||
529d73ab | 698 | if (sshpam_init(authctxt) == -1) |
05114c74 | 699 | fatal("PAM: initialisation failed"); |
a5c9cd31 | 700 | } |
701 | ||
05114c74 | 702 | void |
703 | finish_pam(void) | |
a5c9cd31 | 704 | { |
c6630044 | 705 | sshpam_cleanup(); |
a5c9cd31 | 706 | } |
707 | ||
5b9e2464 | 708 | u_int |
709 | do_pam_account(void) | |
a5c9cd31 | 710 | { |
b3ef7fb7 | 711 | if (sshpam_account_status != -1) |
712 | return (sshpam_account_status); | |
713 | ||
5b9e2464 | 714 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
90f3c272 | 715 | debug3("PAM: %s pam_acct_mgmt = %d", __func__, sshpam_err); |
b3ef7fb7 | 716 | |
717 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { | |
718 | sshpam_account_status = 0; | |
719 | return (sshpam_account_status); | |
5b9e2464 | 720 | } |
721 | ||
b3ef7fb7 | 722 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
723 | pam_password_change_required(1); | |
724 | ||
725 | sshpam_account_status = 1; | |
726 | return (sshpam_account_status); | |
05114c74 | 727 | } |
46c76c63 | 728 | |
49e82bb9 | 729 | void |
730 | do_pam_set_tty(const char *tty) | |
731 | { | |
26b3608b | 732 | if (tty != NULL) { |
733 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
734 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
735 | if (sshpam_err != PAM_SUCCESS) | |
736 | fatal("PAM: failed to set PAM_TTY: %s", | |
737 | pam_strerror(sshpam_handle, sshpam_err)); | |
738 | } | |
05114c74 | 739 | } |
cbd7492e | 740 | |
05114c74 | 741 | void |
742 | do_pam_setcred(int init) | |
743 | { | |
744 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
745 | (const void *)&null_conv); | |
746 | if (sshpam_err != PAM_SUCCESS) | |
747 | fatal("PAM: failed to set PAM_CONV: %s", | |
748 | pam_strerror(sshpam_handle, sshpam_err)); | |
749 | if (init) { | |
750 | debug("PAM: establishing credentials"); | |
751 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
752 | } else { | |
753 | debug("PAM: reinitializing credentials"); | |
754 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
755 | } | |
756 | if (sshpam_err == PAM_SUCCESS) { | |
757 | sshpam_cred_established = 1; | |
758 | return; | |
759 | } | |
760 | if (sshpam_authenticated) | |
761 | fatal("PAM: pam_setcred(): %s", | |
762 | pam_strerror(sshpam_handle, sshpam_err)); | |
763 | else | |
764 | debug("PAM: pam_setcred(): %s", | |
765 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 766 | } |
767 | ||
05114c74 | 768 | static int |
3eaf3960 | 769 | pam_tty_conv(int n, const struct pam_message **msg, |
5b9e2464 | 770 | struct pam_response **resp, void *data) |
ee48c949 | 771 | { |
05114c74 | 772 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 773 | struct pam_response *reply; |
ee48c949 | 774 | int i; |
775 | ||
60922169 | 776 | debug3("PAM: %s called with %d messages", __func__, n); |
777 | ||
0a23d79f | 778 | *resp = NULL; |
779 | ||
3eaf3960 | 780 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 781 | return (PAM_CONV_ERR); |
0a23d79f | 782 | |
783 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
784 | return (PAM_CONV_ERR); | |
785 | memset(reply, 0, n * sizeof(*reply)); | |
786 | ||
05114c74 | 787 | for (i = 0; i < n; ++i) { |
788 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
789 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 790 | reply[i].resp = |
aff51935 | 791 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 792 | RP_ALLOW_STDIN); |
0a23d79f | 793 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 794 | break; |
795 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 796 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 797 | fgets(input, sizeof input, stdin); |
0a23d79f | 798 | reply[i].resp = xstrdup(input); |
799 | reply[i].resp_retcode = PAM_SUCCESS; | |
05114c74 | 800 | break; |
801 | case PAM_ERROR_MSG: | |
802 | case PAM_TEXT_INFO: | |
74117b26 | 803 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 804 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 805 | break; |
806 | default: | |
807 | goto fail; | |
808 | } | |
ee48c949 | 809 | } |
0a23d79f | 810 | *resp = reply; |
05114c74 | 811 | return (PAM_SUCCESS); |
0a23d79f | 812 | |
05114c74 | 813 | fail: |
0a23d79f | 814 | for(i = 0; i < n; i++) { |
815 | if (reply[i].resp != NULL) | |
816 | xfree(reply[i].resp); | |
817 | } | |
818 | xfree(reply); | |
05114c74 | 819 | return (PAM_CONV_ERR); |
ee48c949 | 820 | } |
821 | ||
3eaf3960 | 822 | static struct pam_conv tty_conv = { pam_tty_conv, NULL }; |
823 | ||
05114c74 | 824 | /* |
825 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
826 | * support that | |
827 | */ | |
828 | void | |
829 | do_pam_chauthtok(void) | |
a5c9cd31 | 830 | { |
05114c74 | 831 | if (use_privsep) |
5b9e2464 | 832 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 833 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 834 | (const void *)&tty_conv); |
05114c74 | 835 | if (sshpam_err != PAM_SUCCESS) |
836 | fatal("PAM: failed to set PAM_CONV: %s", | |
837 | pam_strerror(sshpam_handle, sshpam_err)); | |
838 | debug("PAM: changing password"); | |
839 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
840 | if (sshpam_err != PAM_SUCCESS) | |
841 | fatal("PAM: pam_chauthtok(): %s", | |
842 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 843 | } |
844 | ||
ef687c66 | 845 | static int |
846 | pam_store_conv(int n, const struct pam_message **msg, | |
847 | struct pam_response **resp, void *data) | |
848 | { | |
849 | struct pam_response *reply; | |
850 | int i; | |
851 | size_t len; | |
852 | ||
853 | debug3("PAM: %s called with %d messages", __func__, n); | |
854 | *resp = NULL; | |
855 | ||
856 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
857 | return (PAM_CONV_ERR); | |
858 | ||
859 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
860 | return (PAM_CONV_ERR); | |
861 | memset(reply, 0, n * sizeof(*reply)); | |
862 | ||
863 | for (i = 0; i < n; ++i) { | |
864 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
865 | case PAM_ERROR_MSG: | |
866 | case PAM_TEXT_INFO: | |
867 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
868 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); | |
869 | buffer_append(&loginmsg, "\n", 1 ); | |
870 | reply[i].resp_retcode = PAM_SUCCESS; | |
871 | break; | |
872 | default: | |
873 | goto fail; | |
874 | } | |
875 | } | |
876 | *resp = reply; | |
877 | return (PAM_SUCCESS); | |
878 | ||
879 | fail: | |
880 | for(i = 0; i < n; i++) { | |
881 | if (reply[i].resp != NULL) | |
882 | xfree(reply[i].resp); | |
883 | } | |
884 | xfree(reply); | |
885 | return (PAM_CONV_ERR); | |
886 | } | |
887 | ||
888 | static struct pam_conv store_conv = { pam_store_conv, NULL }; | |
889 | ||
3eaf3960 | 890 | void |
891 | do_pam_session(void) | |
892 | { | |
dd1fb864 | 893 | debug3("PAM: opening session"); |
aff51935 | 894 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
ef687c66 | 895 | (const void *)&store_conv); |
3eaf3960 | 896 | if (sshpam_err != PAM_SUCCESS) |
897 | fatal("PAM: failed to set PAM_CONV: %s", | |
898 | pam_strerror(sshpam_handle, sshpam_err)); | |
899 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
900 | if (sshpam_err != PAM_SUCCESS) | |
901 | fatal("PAM: pam_open_session(): %s", | |
902 | pam_strerror(sshpam_handle, sshpam_err)); | |
903 | sshpam_session_open = 1; | |
904 | } | |
905 | ||
aff51935 | 906 | /* |
749560dd | 907 | * Set a PAM environment string. We need to do this so that the session |
908 | * modules can handle things like Kerberos/GSI credentials that appear | |
909 | * during the ssh authentication process. | |
910 | */ | |
749560dd | 911 | int |
aff51935 | 912 | do_pam_putenv(char *name, char *value) |
749560dd | 913 | { |
749560dd | 914 | int ret = 1; |
b6453d99 | 915 | #ifdef HAVE_PAM_PUTENV |
263c65df | 916 | char *compound; |
917 | size_t len; | |
918 | ||
919 | len = strlen(name) + strlen(value) + 2; | |
920 | compound = xmalloc(len); | |
921 | ||
922 | snprintf(compound, len, "%s=%s", name, value); | |
923 | ret = pam_putenv(sshpam_handle, compound); | |
924 | xfree(compound); | |
749560dd | 925 | #endif |
263c65df | 926 | |
749560dd | 927 | return (ret); |
928 | } | |
929 | ||
2212fc98 | 930 | char ** |
931 | fetch_pam_child_environment(void) | |
932 | { | |
933 | return sshpam_env; | |
934 | } | |
935 | ||
05114c74 | 936 | char ** |
937 | fetch_pam_environment(void) | |
938 | { | |
05114c74 | 939 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 940 | } |
5c377b3b | 941 | |
05114c74 | 942 | void |
943 | free_pam_environment(char **env) | |
944 | { | |
945 | char **envp; | |
5daf7064 | 946 | |
0eb6370a | 947 | if (env == NULL) |
948 | return; | |
949 | ||
05114c74 | 950 | for (envp = env; *envp; envp++) |
951 | xfree(*envp); | |
952 | xfree(env); | |
a5c9cd31 | 953 | } |
954 | ||
5de92f17 | 955 | /* |
956 | * "Blind" conversation function for password authentication. Assumes that | |
957 | * echo-off prompts are for the password and stores messages for later | |
958 | * display. | |
959 | */ | |
960 | static int | |
961 | sshpam_passwd_conv(int n, const struct pam_message **msg, | |
962 | struct pam_response **resp, void *data) | |
963 | { | |
964 | struct pam_response *reply; | |
965 | int i; | |
966 | size_t len; | |
967 | ||
968 | debug3("PAM: %s called with %d messages", __func__, n); | |
969 | ||
970 | *resp = NULL; | |
971 | ||
972 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
973 | return (PAM_CONV_ERR); | |
974 | ||
975 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
976 | return (PAM_CONV_ERR); | |
977 | memset(reply, 0, n * sizeof(*reply)); | |
978 | ||
979 | for (i = 0; i < n; ++i) { | |
980 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
981 | case PAM_PROMPT_ECHO_OFF: | |
982 | if (sshpam_password == NULL) | |
983 | goto fail; | |
984 | reply[i].resp = xstrdup(sshpam_password); | |
985 | reply[i].resp_retcode = PAM_SUCCESS; | |
986 | break; | |
987 | case PAM_ERROR_MSG: | |
988 | case PAM_TEXT_INFO: | |
989 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
990 | if (len > 0) { | |
991 | buffer_append(&loginmsg, | |
992 | PAM_MSG_MEMBER(msg, i, msg), len); | |
993 | buffer_append(&loginmsg, "\n", 1); | |
994 | } | |
995 | reply[i].resp = xstrdup(""); | |
996 | reply[i].resp_retcode = PAM_SUCCESS; | |
997 | break; | |
998 | default: | |
999 | goto fail; | |
1000 | } | |
1001 | } | |
1002 | *resp = reply; | |
1003 | return (PAM_SUCCESS); | |
1004 | ||
1005 | fail: | |
1006 | for(i = 0; i < n; i++) { | |
1007 | if (reply[i].resp != NULL) | |
1008 | xfree(reply[i].resp); | |
1009 | } | |
1010 | xfree(reply); | |
1011 | return (PAM_CONV_ERR); | |
1012 | } | |
1013 | ||
1014 | static struct pam_conv passwd_conv = { sshpam_passwd_conv, NULL }; | |
1015 | ||
1016 | /* | |
1017 | * Attempt password authentication via PAM | |
1018 | */ | |
1019 | int | |
1020 | sshpam_auth_passwd(Authctxt *authctxt, const char *password) | |
1021 | { | |
1022 | int flags = (options.permit_empty_passwd == 0 ? | |
1023 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
1024 | ||
1025 | if (!options.use_pam || sshpam_handle == NULL) | |
1026 | fatal("PAM: %s called when PAM disabled or failed to " | |
1027 | "initialise.", __func__); | |
1028 | ||
1029 | sshpam_password = password; | |
1030 | sshpam_authctxt = authctxt; | |
1031 | ||
1032 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
1033 | (const void *)&passwd_conv); | |
1034 | if (sshpam_err != PAM_SUCCESS) | |
1035 | fatal("PAM: %s: failed to set PAM_CONV: %s", __func__, | |
1036 | pam_strerror(sshpam_handle, sshpam_err)); | |
1037 | ||
1038 | sshpam_err = pam_authenticate(sshpam_handle, flags); | |
1039 | sshpam_password = NULL; | |
1040 | if (sshpam_err == PAM_SUCCESS && authctxt->valid) { | |
1041 | debug("PAM: password authentication accepted for %.100s", | |
1042 | authctxt->user); | |
1043 | return 1; | |
1044 | } else { | |
1045 | debug("PAM: password authentication failed for %.100s: %s", | |
1046 | authctxt->valid ? authctxt->user : "an illegal user", | |
1047 | pam_strerror(sshpam_handle, sshpam_err)); | |
1048 | return 0; | |
1049 | } | |
1050 | } | |
a5c9cd31 | 1051 | #endif /* USE_PAM */ |