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