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