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