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