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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; |
05114c74 | 172 | |
2212fc98 | 173 | /* Some PAM implementations don't implement this */ |
174 | #ifndef HAVE_PAM_GETENVLIST | |
175 | static char ** | |
176 | pam_getenvlist(pam_handle_t *pamh) | |
177 | { | |
178 | /* | |
aff51935 | 179 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 180 | * for platforms without pam_getenvlist by searching for known |
181 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
182 | */ | |
183 | return NULL; | |
184 | } | |
185 | #endif | |
186 | ||
b3ef7fb7 | 187 | void |
188 | pam_password_change_required(int reqd) | |
189 | { | |
90f3c272 | 190 | debug3("%s %d", __func__, reqd); |
d948154a | 191 | if (sshpam_authctxt == NULL) |
529d73ab | 192 | fatal("%s: PAM authctxt not initialized", __func__); |
d948154a | 193 | sshpam_authctxt->force_pwchange = reqd; |
b3ef7fb7 | 194 | if (reqd) { |
195 | no_port_forwarding_flag |= 2; | |
196 | no_agent_forwarding_flag |= 2; | |
197 | no_x11_forwarding_flag |= 2; | |
198 | } else { | |
199 | no_port_forwarding_flag &= ~2; | |
200 | no_agent_forwarding_flag &= ~2; | |
201 | no_x11_forwarding_flag &= ~2; | |
b3ef7fb7 | 202 | } |
203 | } | |
dd1fb864 | 204 | |
2212fc98 | 205 | /* Import regular and PAM environment from subprocess */ |
206 | static void | |
207 | import_environments(Buffer *b) | |
208 | { | |
209 | char *env; | |
210 | u_int i, num_env; | |
211 | int err; | |
212 | ||
90f3c272 | 213 | debug3("PAM: %s entering", __func__); |
214 | ||
a1e0095d | 215 | #ifndef USE_POSIX_THREADS |
b3ef7fb7 | 216 | /* Import variables set by do_pam_account */ |
217 | sshpam_account_status = buffer_get_int(b); | |
218 | pam_password_change_required(buffer_get_int(b)); | |
219 | ||
2212fc98 | 220 | /* Import environment from subprocess */ |
221 | num_env = buffer_get_int(b); | |
222 | sshpam_env = xmalloc((num_env + 1) * sizeof(*sshpam_env)); | |
223 | debug3("PAM: num env strings %d", num_env); | |
224 | for(i = 0; i < num_env; i++) | |
225 | sshpam_env[i] = buffer_get_string(b, NULL); | |
226 | ||
227 | sshpam_env[num_env] = NULL; | |
228 | ||
229 | /* Import PAM environment from subprocess */ | |
230 | num_env = buffer_get_int(b); | |
231 | debug("PAM: num PAM env strings %d", num_env); | |
232 | for(i = 0; i < num_env; i++) { | |
233 | env = buffer_get_string(b, NULL); | |
234 | ||
f79a6165 | 235 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 236 | /* Errors are not fatal here */ |
237 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
238 | error("PAM: pam_putenv: %s", | |
239 | pam_strerror(sshpam_handle, sshpam_err)); | |
240 | } | |
f79a6165 | 241 | #endif |
2212fc98 | 242 | } |
a1e0095d | 243 | #endif |
2212fc98 | 244 | } |
245 | ||
ad55cd03 | 246 | /* |
05114c74 | 247 | * Conversation function for authentication thread. |
ad55cd03 | 248 | */ |
05114c74 | 249 | static int |
5b9e2464 | 250 | sshpam_thread_conv(int n, const struct pam_message **msg, |
251 | struct pam_response **resp, void *data) | |
a5c9cd31 | 252 | { |
05114c74 | 253 | Buffer buffer; |
254 | struct pam_ctxt *ctxt; | |
0a23d79f | 255 | struct pam_response *reply; |
05114c74 | 256 | int i; |
257 | ||
60922169 | 258 | debug3("PAM: %s entering, %d messages", __func__, n); |
0a23d79f | 259 | *resp = NULL; |
260 | ||
05114c74 | 261 | ctxt = data; |
262 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
263 | return (PAM_CONV_ERR); | |
0a23d79f | 264 | |
265 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
266 | return (PAM_CONV_ERR); | |
267 | memset(reply, 0, n * sizeof(*reply)); | |
268 | ||
05114c74 | 269 | buffer_init(&buffer); |
270 | for (i = 0; i < n; ++i) { | |
05114c74 | 271 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
272 | case PAM_PROMPT_ECHO_OFF: | |
aff51935 | 273 | buffer_put_cstring(&buffer, |
0a23d79f | 274 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 275 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 276 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
277 | goto fail; | |
aff51935 | 278 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 279 | goto fail; |
05114c74 | 280 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
281 | goto fail; | |
0a23d79f | 282 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 283 | break; |
284 | case PAM_PROMPT_ECHO_ON: | |
aff51935 | 285 | buffer_put_cstring(&buffer, |
0a23d79f | 286 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 287 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 288 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
289 | goto fail; | |
290 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
291 | goto fail; | |
05114c74 | 292 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
293 | goto fail; | |
0a23d79f | 294 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 295 | break; |
296 | case PAM_ERROR_MSG: | |
aff51935 | 297 | buffer_put_cstring(&buffer, |
0a23d79f | 298 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 299 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 300 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
301 | goto fail; | |
05114c74 | 302 | break; |
303 | case PAM_TEXT_INFO: | |
aff51935 | 304 | buffer_put_cstring(&buffer, |
0a23d79f | 305 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 306 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 307 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
308 | goto fail; | |
05114c74 | 309 | break; |
310 | default: | |
311 | goto fail; | |
a5c9cd31 | 312 | } |
05114c74 | 313 | buffer_clear(&buffer); |
a5c9cd31 | 314 | } |
05114c74 | 315 | buffer_free(&buffer); |
0a23d79f | 316 | *resp = reply; |
05114c74 | 317 | return (PAM_SUCCESS); |
0a23d79f | 318 | |
05114c74 | 319 | fail: |
0a23d79f | 320 | for(i = 0; i < n; i++) { |
321 | if (reply[i].resp != NULL) | |
322 | xfree(reply[i].resp); | |
323 | } | |
324 | xfree(reply); | |
05114c74 | 325 | buffer_free(&buffer); |
326 | return (PAM_CONV_ERR); | |
327 | } | |
a5c9cd31 | 328 | |
05114c74 | 329 | /* |
330 | * Authentication thread. | |
331 | */ | |
332 | static void * | |
333 | sshpam_thread(void *ctxtp) | |
334 | { | |
335 | struct pam_ctxt *ctxt = ctxtp; | |
336 | Buffer buffer; | |
c53917a9 | 337 | struct pam_conv sshpam_conv; |
05114c74 | 338 | #ifndef USE_POSIX_THREADS |
2212fc98 | 339 | extern char **environ; |
340 | char **env_from_pam; | |
341 | u_int i; | |
05114c74 | 342 | const char *pam_user; |
343 | ||
344 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); | |
345 | setproctitle("%s [pam]", pam_user); | |
2212fc98 | 346 | environ[0] = NULL; |
05114c74 | 347 | #endif |
a5c9cd31 | 348 | |
c53917a9 | 349 | sshpam_conv.conv = sshpam_thread_conv; |
350 | sshpam_conv.appdata_ptr = ctxt; | |
351 | ||
d948154a | 352 | if (sshpam_authctxt == NULL) |
529d73ab | 353 | fatal("%s: PAM authctxt not initialized", __func__); |
354 | ||
05114c74 | 355 | buffer_init(&buffer); |
356 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
357 | (const void *)&sshpam_conv); | |
358 | if (sshpam_err != PAM_SUCCESS) | |
359 | goto auth_fail; | |
360 | sshpam_err = pam_authenticate(sshpam_handle, 0); | |
361 | if (sshpam_err != PAM_SUCCESS) | |
362 | goto auth_fail; | |
b3ef7fb7 | 363 | |
2935db92 | 364 | if (compat20) { |
b3ef7fb7 | 365 | if (!do_pam_account()) |
366 | goto auth_fail; | |
d948154a | 367 | if (sshpam_authctxt->force_pwchange) { |
b3ef7fb7 | 368 | sshpam_err = pam_chauthtok(sshpam_handle, |
369 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
370 | if (sshpam_err != PAM_SUCCESS) | |
371 | goto auth_fail; | |
372 | pam_password_change_required(0); | |
373 | } | |
2935db92 | 374 | } |
b3ef7fb7 | 375 | |
05114c74 | 376 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 377 | |
378 | #ifndef USE_POSIX_THREADS | |
b3ef7fb7 | 379 | /* Export variables set by do_pam_account */ |
380 | buffer_put_int(&buffer, sshpam_account_status); | |
d948154a | 381 | buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); |
b3ef7fb7 | 382 | |
2212fc98 | 383 | /* Export any environment strings set in child */ |
384 | for(i = 0; environ[i] != NULL; i++) | |
385 | ; /* Count */ | |
386 | buffer_put_int(&buffer, i); | |
387 | for(i = 0; environ[i] != NULL; i++) | |
388 | buffer_put_cstring(&buffer, environ[i]); | |
389 | ||
390 | /* Export any environment strings set by PAM in child */ | |
391 | env_from_pam = pam_getenvlist(sshpam_handle); | |
392 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
393 | ; /* Count */ | |
394 | buffer_put_int(&buffer, i); | |
395 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
396 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
397 | #endif /* USE_POSIX_THREADS */ | |
398 | ||
7b2a0de3 | 399 | /* XXX - can't do much about an error here */ |
05114c74 | 400 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
401 | buffer_free(&buffer); | |
402 | pthread_exit(NULL); | |
403 | ||
404 | auth_fail: | |
405 | buffer_put_cstring(&buffer, | |
406 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 407 | /* XXX - can't do much about an error here */ |
05114c74 | 408 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); |
409 | buffer_free(&buffer); | |
410 | pthread_exit(NULL); | |
b6453d99 | 411 | |
05114c74 | 412 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 413 | } |
414 | ||
c6630044 | 415 | void |
416 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 417 | { |
c6630044 | 418 | struct pam_ctxt *ctxt = cleanup_ctxt; |
419 | ||
90f3c272 | 420 | debug3("PAM: %s entering", __func__); |
c6630044 | 421 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
422 | pthread_cancel(ctxt->pam_thread); | |
423 | pthread_join(ctxt->pam_thread, NULL); | |
424 | close(ctxt->pam_psock); | |
425 | close(ctxt->pam_csock); | |
426 | memset(ctxt, 0, sizeof(*ctxt)); | |
427 | cleanup_ctxt = NULL; | |
428 | } | |
05114c74 | 429 | } |
a5c9cd31 | 430 | |
05114c74 | 431 | static int |
5b9e2464 | 432 | sshpam_null_conv(int n, const struct pam_message **msg, |
433 | struct pam_response **resp, void *data) | |
05114c74 | 434 | { |
60922169 | 435 | debug3("PAM: %s entering, %d messages", __func__, n); |
05114c74 | 436 | return (PAM_CONV_ERR); |
437 | } | |
a5c9cd31 | 438 | |
05114c74 | 439 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
440 | ||
c6630044 | 441 | void |
442 | sshpam_cleanup(void) | |
05114c74 | 443 | { |
05114c74 | 444 | debug("PAM: cleanup"); |
0a23d79f | 445 | if (sshpam_handle == NULL) |
446 | return; | |
05114c74 | 447 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
448 | if (sshpam_cred_established) { | |
449 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
450 | sshpam_cred_established = 0; | |
451 | } | |
452 | if (sshpam_session_open) { | |
453 | pam_close_session(sshpam_handle, PAM_SILENT); | |
454 | sshpam_session_open = 0; | |
a5c9cd31 | 455 | } |
dd1fb864 | 456 | sshpam_authenticated = 0; |
05114c74 | 457 | pam_end(sshpam_handle, sshpam_err); |
458 | sshpam_handle = NULL; | |
a5c9cd31 | 459 | } |
460 | ||
05114c74 | 461 | static int |
529d73ab | 462 | sshpam_init(Authctxt *authctxt) |
a5c9cd31 | 463 | { |
74678fb9 | 464 | extern char *__progname; |
529d73ab | 465 | const char *pam_rhost, *pam_user, *user = authctxt->user; |
05114c74 | 466 | |
467 | if (sshpam_handle != NULL) { | |
468 | /* We already have a PAM context; check if the user matches */ | |
469 | sshpam_err = pam_get_item(sshpam_handle, | |
470 | PAM_USER, (const void **)&pam_user); | |
471 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) | |
472 | return (0); | |
05114c74 | 473 | pam_end(sshpam_handle, sshpam_err); |
474 | sshpam_handle = NULL; | |
475 | } | |
476 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 477 | sshpam_err = |
478 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); | |
d948154a | 479 | sshpam_authctxt = authctxt; |
529d73ab | 480 | |
5ff453c0 | 481 | if (sshpam_err != PAM_SUCCESS) { |
482 | pam_end(sshpam_handle, sshpam_err); | |
483 | sshpam_handle = NULL; | |
05114c74 | 484 | return (-1); |
5ff453c0 | 485 | } |
c5a7d788 | 486 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 487 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 488 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 489 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 490 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 491 | sshpam_handle = NULL; |
492 | return (-1); | |
493 | } | |
494 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 495 | /* |
496 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
497 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 498 | * may not even set one (for tty-less connections) |
aff51935 | 499 | */ |
5ff453c0 | 500 | debug("PAM: setting PAM_TTY to \"ssh\""); |
501 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 502 | if (sshpam_err != PAM_SUCCESS) { |
503 | pam_end(sshpam_handle, sshpam_err); | |
504 | sshpam_handle = NULL; | |
505 | return (-1); | |
a5c9cd31 | 506 | } |
5ff453c0 | 507 | #endif |
05114c74 | 508 | return (0); |
a5c9cd31 | 509 | } |
510 | ||
05114c74 | 511 | static void * |
512 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 513 | { |
05114c74 | 514 | struct pam_ctxt *ctxt; |
515 | int socks[2]; | |
2b87da3b | 516 | |
90f3c272 | 517 | debug3("PAM: %s entering", __func__); |
7fceb20d | 518 | /* Refuse to start if we don't have PAM enabled */ |
519 | if (!options.use_pam) | |
520 | return NULL; | |
521 | ||
05114c74 | 522 | /* Initialize PAM */ |
529d73ab | 523 | if (sshpam_init(authctxt) == -1) { |
05114c74 | 524 | error("PAM: initialization failed"); |
525 | return (NULL); | |
526 | } | |
5c377b3b | 527 | |
05114c74 | 528 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 529 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 530 | |
531 | /* Start the authentication thread */ | |
532 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
533 | error("PAM: failed create sockets: %s", strerror(errno)); | |
534 | xfree(ctxt); | |
535 | return (NULL); | |
536 | } | |
537 | ctxt->pam_psock = socks[0]; | |
538 | ctxt->pam_csock = socks[1]; | |
539 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
540 | error("PAM: failed to start authentication thread: %s", | |
541 | strerror(errno)); | |
542 | close(socks[0]); | |
543 | close(socks[1]); | |
544 | xfree(ctxt); | |
545 | return (NULL); | |
a5c9cd31 | 546 | } |
c6630044 | 547 | cleanup_ctxt = ctxt; |
05114c74 | 548 | return (ctxt); |
549 | } | |
a5c9cd31 | 550 | |
05114c74 | 551 | static int |
552 | sshpam_query(void *ctx, char **name, char **info, | |
553 | u_int *num, char ***prompts, u_int **echo_on) | |
554 | { | |
555 | Buffer buffer; | |
556 | struct pam_ctxt *ctxt = ctx; | |
557 | size_t plen; | |
558 | u_char type; | |
559 | char *msg; | |
cbdeccf3 | 560 | size_t len; |
05114c74 | 561 | |
90f3c272 | 562 | debug3("PAM: %s entering", __func__); |
05114c74 | 563 | buffer_init(&buffer); |
564 | *name = xstrdup(""); | |
565 | *info = xstrdup(""); | |
566 | *prompts = xmalloc(sizeof(char *)); | |
567 | **prompts = NULL; | |
568 | plen = 0; | |
569 | *echo_on = xmalloc(sizeof(u_int)); | |
570 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
571 | type = buffer_get_char(&buffer); | |
572 | msg = buffer_get_string(&buffer, NULL); | |
573 | switch (type) { | |
574 | case PAM_PROMPT_ECHO_ON: | |
575 | case PAM_PROMPT_ECHO_OFF: | |
576 | *num = 1; | |
cbdeccf3 | 577 | len = plen + strlen(msg) + 1; |
578 | **prompts = xrealloc(**prompts, len); | |
579 | plen += snprintf(**prompts + plen, len, "%s", msg); | |
05114c74 | 580 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
581 | xfree(msg); | |
582 | return (0); | |
583 | case PAM_ERROR_MSG: | |
584 | case PAM_TEXT_INFO: | |
585 | /* accumulate messages */ | |
4f1b45b4 | 586 | len = plen + strlen(msg) + 2; |
cbdeccf3 | 587 | **prompts = xrealloc(**prompts, len); |
4f1b45b4 | 588 | plen += snprintf(**prompts + plen, len, "%s\n", msg); |
05114c74 | 589 | xfree(msg); |
5daf7064 | 590 | break; |
05114c74 | 591 | case PAM_SUCCESS: |
592 | case PAM_AUTH_ERR: | |
593 | if (**prompts != NULL) { | |
594 | /* drain any accumulated messages */ | |
3eaf3960 | 595 | debug("PAM: %s", **prompts); |
596 | buffer_append(&loginmsg, **prompts, | |
597 | strlen(**prompts)); | |
05114c74 | 598 | xfree(**prompts); |
599 | **prompts = NULL; | |
600 | } | |
601 | if (type == PAM_SUCCESS) { | |
2212fc98 | 602 | import_environments(&buffer); |
05114c74 | 603 | *num = 0; |
604 | **echo_on = 0; | |
605 | ctxt->pam_done = 1; | |
606 | xfree(msg); | |
607 | return (0); | |
608 | } | |
1e08e787 | 609 | error("PAM: %s for %s%.100s from %.100s", msg, |
610 | sshpam_authctxt->valid ? "" : "illegal user ", | |
611 | sshpam_authctxt->user, | |
612 | get_remote_name_or_ip(utmp_len, options.use_dns)); | |
e250770b | 613 | /* FALLTHROUGH */ |
5daf7064 | 614 | default: |
05114c74 | 615 | *num = 0; |
616 | **echo_on = 0; | |
617 | xfree(msg); | |
618 | ctxt->pam_done = -1; | |
619 | return (-1); | |
620 | } | |
a5c9cd31 | 621 | } |
05114c74 | 622 | return (-1); |
a5c9cd31 | 623 | } |
624 | ||
05114c74 | 625 | /* XXX - see also comment in auth-chall.c:verify_response */ |
626 | static int | |
627 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 628 | { |
05114c74 | 629 | Buffer buffer; |
630 | struct pam_ctxt *ctxt = ctx; | |
631 | ||
90f3c272 | 632 | debug2("PAM: %s entering, %d responses", __func__, num); |
05114c74 | 633 | switch (ctxt->pam_done) { |
634 | case 1: | |
635 | sshpam_authenticated = 1; | |
636 | return (0); | |
637 | case 0: | |
638 | break; | |
639 | default: | |
640 | return (-1); | |
a5c9cd31 | 641 | } |
05114c74 | 642 | if (num != 1) { |
643 | error("PAM: expected one response, got %u", num); | |
644 | return (-1); | |
645 | } | |
646 | buffer_init(&buffer); | |
647 | buffer_put_cstring(&buffer, *resp); | |
7b2a0de3 | 648 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
649 | buffer_free(&buffer); | |
650 | return (-1); | |
651 | } | |
05114c74 | 652 | buffer_free(&buffer); |
653 | return (1); | |
a5c9cd31 | 654 | } |
655 | ||
05114c74 | 656 | static void |
657 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 658 | { |
05114c74 | 659 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 660 | |
90f3c272 | 661 | debug3("PAM: %s entering", __func__); |
c6630044 | 662 | sshpam_thread_cleanup(); |
05114c74 | 663 | xfree(ctxt); |
664 | /* | |
665 | * We don't call sshpam_cleanup() here because we may need the PAM | |
666 | * handle at a later stage, e.g. when setting up a session. It's | |
667 | * still on the cleanup list, so pam_end() *will* be called before | |
668 | * the server process terminates. | |
669 | */ | |
ad55cd03 | 670 | } |
671 | ||
05114c74 | 672 | KbdintDevice sshpam_device = { |
673 | "pam", | |
674 | sshpam_init_ctx, | |
675 | sshpam_query, | |
676 | sshpam_respond, | |
677 | sshpam_free_ctx | |
678 | }; | |
679 | ||
680 | KbdintDevice mm_sshpam_device = { | |
681 | "pam", | |
682 | mm_sshpam_init_ctx, | |
683 | mm_sshpam_query, | |
684 | mm_sshpam_respond, | |
685 | mm_sshpam_free_ctx | |
686 | }; | |
2919e060 | 687 | |
2b87da3b | 688 | /* |
05114c74 | 689 | * This replaces auth-pam.c |
ad55cd03 | 690 | */ |
05114c74 | 691 | void |
529d73ab | 692 | start_pam(Authctxt *authctxt) |
ad55cd03 | 693 | { |
817e6d38 | 694 | if (!options.use_pam) |
695 | fatal("PAM: initialisation requested when UsePAM=no"); | |
696 | ||
529d73ab | 697 | if (sshpam_init(authctxt) == -1) |
05114c74 | 698 | fatal("PAM: initialisation failed"); |
a5c9cd31 | 699 | } |
700 | ||
05114c74 | 701 | void |
702 | finish_pam(void) | |
a5c9cd31 | 703 | { |
c6630044 | 704 | sshpam_cleanup(); |
a5c9cd31 | 705 | } |
706 | ||
5b9e2464 | 707 | u_int |
708 | do_pam_account(void) | |
a5c9cd31 | 709 | { |
b3ef7fb7 | 710 | if (sshpam_account_status != -1) |
711 | return (sshpam_account_status); | |
712 | ||
5b9e2464 | 713 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
90f3c272 | 714 | debug3("PAM: %s pam_acct_mgmt = %d", __func__, sshpam_err); |
b3ef7fb7 | 715 | |
716 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { | |
717 | sshpam_account_status = 0; | |
718 | return (sshpam_account_status); | |
5b9e2464 | 719 | } |
720 | ||
b3ef7fb7 | 721 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
722 | pam_password_change_required(1); | |
723 | ||
724 | sshpam_account_status = 1; | |
725 | return (sshpam_account_status); | |
05114c74 | 726 | } |
46c76c63 | 727 | |
49e82bb9 | 728 | void |
729 | do_pam_set_tty(const char *tty) | |
730 | { | |
26b3608b | 731 | if (tty != NULL) { |
732 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
733 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
734 | if (sshpam_err != PAM_SUCCESS) | |
735 | fatal("PAM: failed to set PAM_TTY: %s", | |
736 | pam_strerror(sshpam_handle, sshpam_err)); | |
737 | } | |
05114c74 | 738 | } |
cbd7492e | 739 | |
05114c74 | 740 | void |
741 | do_pam_setcred(int init) | |
742 | { | |
743 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
744 | (const void *)&null_conv); | |
745 | if (sshpam_err != PAM_SUCCESS) | |
746 | fatal("PAM: failed to set PAM_CONV: %s", | |
747 | pam_strerror(sshpam_handle, sshpam_err)); | |
748 | if (init) { | |
749 | debug("PAM: establishing credentials"); | |
750 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
751 | } else { | |
752 | debug("PAM: reinitializing credentials"); | |
753 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
754 | } | |
755 | if (sshpam_err == PAM_SUCCESS) { | |
756 | sshpam_cred_established = 1; | |
757 | return; | |
758 | } | |
759 | if (sshpam_authenticated) | |
760 | fatal("PAM: pam_setcred(): %s", | |
761 | pam_strerror(sshpam_handle, sshpam_err)); | |
762 | else | |
763 | debug("PAM: pam_setcred(): %s", | |
764 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 765 | } |
766 | ||
05114c74 | 767 | static int |
3eaf3960 | 768 | pam_tty_conv(int n, const struct pam_message **msg, |
5b9e2464 | 769 | struct pam_response **resp, void *data) |
ee48c949 | 770 | { |
05114c74 | 771 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 772 | struct pam_response *reply; |
ee48c949 | 773 | int i; |
774 | ||
60922169 | 775 | debug3("PAM: %s called with %d messages", __func__, n); |
776 | ||
0a23d79f | 777 | *resp = NULL; |
778 | ||
3eaf3960 | 779 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 780 | return (PAM_CONV_ERR); |
0a23d79f | 781 | |
782 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
783 | return (PAM_CONV_ERR); | |
784 | memset(reply, 0, n * sizeof(*reply)); | |
785 | ||
05114c74 | 786 | for (i = 0; i < n; ++i) { |
787 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
788 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 789 | reply[i].resp = |
aff51935 | 790 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 791 | RP_ALLOW_STDIN); |
0a23d79f | 792 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 793 | break; |
794 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 795 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 796 | fgets(input, sizeof input, stdin); |
0a23d79f | 797 | reply[i].resp = xstrdup(input); |
798 | reply[i].resp_retcode = PAM_SUCCESS; | |
05114c74 | 799 | break; |
800 | case PAM_ERROR_MSG: | |
801 | case PAM_TEXT_INFO: | |
74117b26 | 802 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 803 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 804 | break; |
805 | default: | |
806 | goto fail; | |
807 | } | |
ee48c949 | 808 | } |
0a23d79f | 809 | *resp = reply; |
05114c74 | 810 | return (PAM_SUCCESS); |
0a23d79f | 811 | |
05114c74 | 812 | fail: |
0a23d79f | 813 | for(i = 0; i < n; i++) { |
814 | if (reply[i].resp != NULL) | |
815 | xfree(reply[i].resp); | |
816 | } | |
817 | xfree(reply); | |
05114c74 | 818 | return (PAM_CONV_ERR); |
ee48c949 | 819 | } |
820 | ||
3eaf3960 | 821 | static struct pam_conv tty_conv = { pam_tty_conv, NULL }; |
822 | ||
05114c74 | 823 | /* |
824 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
825 | * support that | |
826 | */ | |
827 | void | |
828 | do_pam_chauthtok(void) | |
a5c9cd31 | 829 | { |
05114c74 | 830 | if (use_privsep) |
5b9e2464 | 831 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 832 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 833 | (const void *)&tty_conv); |
05114c74 | 834 | if (sshpam_err != PAM_SUCCESS) |
835 | fatal("PAM: failed to set PAM_CONV: %s", | |
836 | pam_strerror(sshpam_handle, sshpam_err)); | |
837 | debug("PAM: changing password"); | |
838 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
839 | if (sshpam_err != PAM_SUCCESS) | |
840 | fatal("PAM: pam_chauthtok(): %s", | |
841 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 842 | } |
843 | ||
ef687c66 | 844 | static int |
845 | pam_store_conv(int n, const struct pam_message **msg, | |
846 | struct pam_response **resp, void *data) | |
847 | { | |
848 | struct pam_response *reply; | |
849 | int i; | |
850 | size_t len; | |
851 | ||
852 | debug3("PAM: %s called with %d messages", __func__, n); | |
853 | *resp = NULL; | |
854 | ||
855 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
856 | return (PAM_CONV_ERR); | |
857 | ||
858 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
859 | return (PAM_CONV_ERR); | |
860 | memset(reply, 0, n * sizeof(*reply)); | |
861 | ||
862 | for (i = 0; i < n; ++i) { | |
863 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
864 | case PAM_ERROR_MSG: | |
865 | case PAM_TEXT_INFO: | |
866 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
867 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); | |
868 | buffer_append(&loginmsg, "\n", 1 ); | |
869 | reply[i].resp_retcode = PAM_SUCCESS; | |
870 | break; | |
871 | default: | |
872 | goto fail; | |
873 | } | |
874 | } | |
875 | *resp = reply; | |
876 | return (PAM_SUCCESS); | |
877 | ||
878 | fail: | |
879 | for(i = 0; i < n; i++) { | |
880 | if (reply[i].resp != NULL) | |
881 | xfree(reply[i].resp); | |
882 | } | |
883 | xfree(reply); | |
884 | return (PAM_CONV_ERR); | |
885 | } | |
886 | ||
887 | static struct pam_conv store_conv = { pam_store_conv, NULL }; | |
888 | ||
3eaf3960 | 889 | void |
890 | do_pam_session(void) | |
891 | { | |
dd1fb864 | 892 | debug3("PAM: opening session"); |
aff51935 | 893 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
ef687c66 | 894 | (const void *)&store_conv); |
3eaf3960 | 895 | if (sshpam_err != PAM_SUCCESS) |
896 | fatal("PAM: failed to set PAM_CONV: %s", | |
897 | pam_strerror(sshpam_handle, sshpam_err)); | |
898 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
899 | if (sshpam_err != PAM_SUCCESS) | |
900 | fatal("PAM: pam_open_session(): %s", | |
901 | pam_strerror(sshpam_handle, sshpam_err)); | |
902 | sshpam_session_open = 1; | |
903 | } | |
904 | ||
aff51935 | 905 | /* |
749560dd | 906 | * Set a PAM environment string. We need to do this so that the session |
907 | * modules can handle things like Kerberos/GSI credentials that appear | |
908 | * during the ssh authentication process. | |
909 | */ | |
749560dd | 910 | int |
aff51935 | 911 | do_pam_putenv(char *name, char *value) |
749560dd | 912 | { |
749560dd | 913 | int ret = 1; |
b6453d99 | 914 | #ifdef HAVE_PAM_PUTENV |
263c65df | 915 | char *compound; |
916 | size_t len; | |
917 | ||
918 | len = strlen(name) + strlen(value) + 2; | |
919 | compound = xmalloc(len); | |
920 | ||
921 | snprintf(compound, len, "%s=%s", name, value); | |
922 | ret = pam_putenv(sshpam_handle, compound); | |
923 | xfree(compound); | |
749560dd | 924 | #endif |
263c65df | 925 | |
749560dd | 926 | return (ret); |
927 | } | |
928 | ||
2212fc98 | 929 | char ** |
930 | fetch_pam_child_environment(void) | |
931 | { | |
932 | return sshpam_env; | |
933 | } | |
934 | ||
05114c74 | 935 | char ** |
936 | fetch_pam_environment(void) | |
937 | { | |
05114c74 | 938 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 939 | } |
5c377b3b | 940 | |
05114c74 | 941 | void |
942 | free_pam_environment(char **env) | |
943 | { | |
944 | char **envp; | |
5daf7064 | 945 | |
0eb6370a | 946 | if (env == NULL) |
947 | return; | |
948 | ||
05114c74 | 949 | for (envp = env; *envp; envp++) |
950 | xfree(*envp); | |
951 | xfree(env); | |
a5c9cd31 | 952 | } |
953 | ||
954 | #endif /* USE_PAM */ |