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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 | */ |
93c5ef94 | 31 | /* |
32 | * Copyright (c) 2003,2004 Damien Miller <djm@mindrot.org> | |
33 | * Copyright (c) 2003,2004 Darren Tucker <dtucker@zip.com.au> | |
34 | * | |
35 | * Permission to use, copy, modify, and distribute this software for any | |
36 | * purpose with or without fee is hereby granted, provided that the above | |
37 | * copyright notice and this permission notice appear in all copies. | |
38 | * | |
39 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
40 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
41 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
42 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
43 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
44 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
45 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
46 | */ | |
a5c9cd31 | 47 | |
5ff453c0 | 48 | /* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */ |
a5c9cd31 | 49 | #include "includes.h" |
50 | ||
b5b88c19 | 51 | #include <sys/types.h> |
52 | #include <sys/stat.h> | |
53 | #include <sys/wait.h> | |
4352744e | 54 | |
55 | #include <errno.h> | |
b5b88c19 | 56 | #include <signal.h> |
57 | ||
a5c9cd31 | 58 | #ifdef USE_PAM |
2511d104 | 59 | #if defined(HAVE_SECURITY_PAM_APPL_H) |
05114c74 | 60 | #include <security/pam_appl.h> |
2511d104 | 61 | #elif defined (HAVE_PAM_PAM_APPL_H) |
62 | #include <pam/pam_appl.h> | |
63 | #endif | |
05114c74 | 64 | |
44171182 | 65 | /* OpenGroup RFC86.0 and XSSO specify no "const" on arguments */ |
66 | #ifdef PAM_SUN_CODEBASE | |
67 | # define sshpam_const /* Solaris, HP-UX, AIX */ | |
68 | #else | |
69 | # define sshpam_const const /* LinuxPAM, OpenPAM */ | |
70 | #endif | |
71 | ||
fde58bd4 | 72 | #include "auth.h" |
5c377b3b | 73 | #include "auth-pam.h" |
05114c74 | 74 | #include "buffer.h" |
75 | #include "bufaux.h" | |
42f11eb2 | 76 | #include "canohost.h" |
05114c74 | 77 | #include "log.h" |
78 | #include "monitor_wrap.h" | |
79 | #include "msg.h" | |
80 | #include "packet.h" | |
0f3ee929 | 81 | #include "misc.h" |
05114c74 | 82 | #include "servconf.h" |
83 | #include "ssh2.h" | |
84 | #include "xmalloc.h" | |
5b9e2464 | 85 | #include "auth-options.h" |
a5c9cd31 | 86 | |
7fceb20d | 87 | extern ServerOptions options; |
3eaf3960 | 88 | extern Buffer loginmsg; |
b3ef7fb7 | 89 | extern int compat20; |
1e08e787 | 90 | extern u_int utmp_len; |
7fceb20d | 91 | |
b4143b2a | 92 | /* so we don't silently change behaviour */ |
05114c74 | 93 | #ifdef USE_POSIX_THREADS |
b4143b2a | 94 | # error "USE_POSIX_THREADS replaced by UNSUPPORTED_POSIX_THREADS_HACK" |
95 | #endif | |
96 | ||
97 | /* | |
98 | * Formerly known as USE_POSIX_THREADS, using this is completely unsupported | |
99 | * and generally a bad idea. Use at own risk and do not expect support if | |
100 | * this breaks. | |
101 | */ | |
102 | #ifdef UNSUPPORTED_POSIX_THREADS_HACK | |
05114c74 | 103 | #include <pthread.h> |
104 | /* | |
aff51935 | 105 | * Avoid namespace clash when *not* using pthreads for systems *with* |
106 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
05114c74 | 107 | * (e.g. Linux) |
108 | */ | |
aff51935 | 109 | typedef pthread_t sp_pthread_t; |
05114c74 | 110 | #else |
e47e681f | 111 | typedef pid_t sp_pthread_t; |
112 | #endif | |
113 | ||
114 | struct pam_ctxt { | |
115 | sp_pthread_t pam_thread; | |
116 | int pam_psock; | |
117 | int pam_csock; | |
118 | int pam_done; | |
119 | }; | |
120 | ||
121 | static void sshpam_free_ctx(void *); | |
122 | static struct pam_ctxt *cleanup_ctxt; | |
123 | ||
b4143b2a | 124 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
05114c74 | 125 | /* |
126 | * Simulate threads with processes. | |
127 | */ | |
a5c9cd31 | 128 | |
100e6910 | 129 | static int sshpam_thread_status = -1; |
130 | static mysig_t sshpam_oldsig; | |
131 | ||
d1cf9a87 | 132 | static void |
100e6910 | 133 | sshpam_sigchld_handler(int sig) |
134 | { | |
8a956cda | 135 | signal(SIGCHLD, SIG_DFL); |
28b49ff8 | 136 | if (cleanup_ctxt == NULL) |
137 | return; /* handler called after PAM cleanup, shouldn't happen */ | |
8a956cda | 138 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG) |
ed9e8be3 | 139 | <= 0) { |
8a956cda | 140 | /* PAM thread has not exitted, privsep slave must have */ |
141 | kill(cleanup_ctxt->pam_thread, SIGTERM); | |
142 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) | |
930d0441 | 143 | <= 0) |
8a956cda | 144 | return; /* could not wait */ |
145 | } | |
100e6910 | 146 | if (WIFSIGNALED(sshpam_thread_status) && |
147 | WTERMSIG(sshpam_thread_status) == SIGTERM) | |
148 | return; /* terminated by pthread_cancel */ | |
149 | if (!WIFEXITED(sshpam_thread_status)) | |
150 | fatal("PAM: authentication thread exited unexpectedly"); | |
151 | if (WEXITSTATUS(sshpam_thread_status) != 0) | |
152 | fatal("PAM: authentication thread exited uncleanly"); | |
153 | } | |
154 | ||
05114c74 | 155 | static void |
156 | pthread_exit(void *value __unused) | |
157 | { | |
158 | _exit(0); | |
159 | } | |
5daf7064 | 160 | |
05114c74 | 161 | static int |
162 | pthread_create(sp_pthread_t *thread, const void *attr __unused, | |
163 | void *(*thread_start)(void *), void *arg) | |
164 | { | |
165 | pid_t pid; | |
5d001c70 | 166 | struct pam_ctxt *ctx = arg; |
05114c74 | 167 | |
355fbf31 | 168 | sshpam_thread_status = -1; |
05114c74 | 169 | switch ((pid = fork())) { |
170 | case -1: | |
171 | error("fork(): %s", strerror(errno)); | |
172 | return (-1); | |
173 | case 0: | |
5d001c70 | 174 | close(ctx->pam_psock); |
175 | ctx->pam_psock = -1; | |
05114c74 | 176 | thread_start(arg); |
177 | _exit(1); | |
178 | default: | |
179 | *thread = pid; | |
5d001c70 | 180 | close(ctx->pam_csock); |
181 | ctx->pam_csock = -1; | |
100e6910 | 182 | sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); |
05114c74 | 183 | return (0); |
184 | } | |
185 | } | |
a5c9cd31 | 186 | |
05114c74 | 187 | static int |
188 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 189 | { |
28b49ff8 | 190 | signal(SIGCHLD, sshpam_oldsig); |
05114c74 | 191 | return (kill(thread, SIGTERM)); |
8c9fe09e | 192 | } |
193 | ||
05114c74 | 194 | static int |
195 | pthread_join(sp_pthread_t thread, void **value __unused) | |
8c9fe09e | 196 | { |
05114c74 | 197 | int status; |
198 | ||
100e6910 | 199 | if (sshpam_thread_status != -1) |
200 | return (sshpam_thread_status); | |
201 | signal(SIGCHLD, sshpam_oldsig); | |
05114c74 | 202 | waitpid(thread, &status, 0); |
203 | return (status); | |
8c9fe09e | 204 | } |
05114c74 | 205 | #endif |
206 | ||
207 | ||
0a23d79f | 208 | static pam_handle_t *sshpam_handle = NULL; |
209 | static int sshpam_err = 0; | |
210 | static int sshpam_authenticated = 0; | |
0a23d79f | 211 | static int sshpam_session_open = 0; |
212 | static int sshpam_cred_established = 0; | |
b3ef7fb7 | 213 | static int sshpam_account_status = -1; |
2212fc98 | 214 | static char **sshpam_env = NULL; |
d948154a | 215 | static Authctxt *sshpam_authctxt = NULL; |
5de92f17 | 216 | static const char *sshpam_password = NULL; |
af0e5c2f | 217 | static char badpw[] = "\b\n\r\177INCORRECT"; |
05114c74 | 218 | |
2212fc98 | 219 | /* Some PAM implementations don't implement this */ |
220 | #ifndef HAVE_PAM_GETENVLIST | |
221 | static char ** | |
222 | pam_getenvlist(pam_handle_t *pamh) | |
223 | { | |
224 | /* | |
aff51935 | 225 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 226 | * for platforms without pam_getenvlist by searching for known |
227 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
228 | */ | |
229 | return NULL; | |
230 | } | |
231 | #endif | |
232 | ||
059d3165 | 233 | /* |
234 | * Some platforms, notably Solaris, do not enforce password complexity | |
235 | * rules during pam_chauthtok() if the real uid of the calling process | |
236 | * is 0, on the assumption that it's being called by "passwd" run by root. | |
237 | * This wraps pam_chauthtok and sets/restore the real uid so PAM will do | |
238 | * the right thing. | |
239 | */ | |
240 | #ifdef SSHPAM_CHAUTHTOK_NEEDS_RUID | |
241 | static int | |
242 | sshpam_chauthtok_ruid(pam_handle_t *pamh, int flags) | |
243 | { | |
244 | int result; | |
245 | ||
246 | if (sshpam_authctxt == NULL) | |
247 | fatal("PAM: sshpam_authctxt not initialized"); | |
248 | if (setreuid(sshpam_authctxt->pw->pw_uid, -1) == -1) | |
249 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
250 | result = pam_chauthtok(pamh, flags); | |
251 | if (setreuid(0, -1) == -1) | |
252 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
253 | return result; | |
254 | } | |
255 | # define pam_chauthtok(a,b) (sshpam_chauthtok_ruid((a), (b))) | |
256 | #endif | |
257 | ||
b3ef7fb7 | 258 | void |
c10bb2ce | 259 | sshpam_password_change_required(int reqd) |
b3ef7fb7 | 260 | { |
90f3c272 | 261 | debug3("%s %d", __func__, reqd); |
d948154a | 262 | if (sshpam_authctxt == NULL) |
529d73ab | 263 | fatal("%s: PAM authctxt not initialized", __func__); |
d948154a | 264 | sshpam_authctxt->force_pwchange = reqd; |
b3ef7fb7 | 265 | if (reqd) { |
266 | no_port_forwarding_flag |= 2; | |
267 | no_agent_forwarding_flag |= 2; | |
268 | no_x11_forwarding_flag |= 2; | |
269 | } else { | |
270 | no_port_forwarding_flag &= ~2; | |
271 | no_agent_forwarding_flag &= ~2; | |
272 | no_x11_forwarding_flag &= ~2; | |
b3ef7fb7 | 273 | } |
274 | } | |
dd1fb864 | 275 | |
2212fc98 | 276 | /* Import regular and PAM environment from subprocess */ |
277 | static void | |
278 | import_environments(Buffer *b) | |
279 | { | |
280 | char *env; | |
281 | u_int i, num_env; | |
282 | int err; | |
283 | ||
90f3c272 | 284 | debug3("PAM: %s entering", __func__); |
285 | ||
b4143b2a | 286 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 287 | /* Import variables set by do_pam_account */ |
288 | sshpam_account_status = buffer_get_int(b); | |
c10bb2ce | 289 | sshpam_password_change_required(buffer_get_int(b)); |
b3ef7fb7 | 290 | |
2212fc98 | 291 | /* Import environment from subprocess */ |
292 | num_env = buffer_get_int(b); | |
01d35895 | 293 | if (num_env > 1024) |
294 | fatal("%s: received %u environment variables, expected <= 1024", | |
295 | __func__, num_env); | |
296 | sshpam_env = xcalloc(num_env + 1, sizeof(*sshpam_env)); | |
2212fc98 | 297 | debug3("PAM: num env strings %d", num_env); |
298 | for(i = 0; i < num_env; i++) | |
299 | sshpam_env[i] = buffer_get_string(b, NULL); | |
300 | ||
301 | sshpam_env[num_env] = NULL; | |
302 | ||
303 | /* Import PAM environment from subprocess */ | |
304 | num_env = buffer_get_int(b); | |
305 | debug("PAM: num PAM env strings %d", num_env); | |
306 | for(i = 0; i < num_env; i++) { | |
307 | env = buffer_get_string(b, NULL); | |
308 | ||
f79a6165 | 309 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 310 | /* Errors are not fatal here */ |
311 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
312 | error("PAM: pam_putenv: %s", | |
313 | pam_strerror(sshpam_handle, sshpam_err)); | |
314 | } | |
f79a6165 | 315 | #endif |
2212fc98 | 316 | } |
a1e0095d | 317 | #endif |
2212fc98 | 318 | } |
319 | ||
ad55cd03 | 320 | /* |
05114c74 | 321 | * Conversation function for authentication thread. |
ad55cd03 | 322 | */ |
05114c74 | 323 | static int |
44171182 | 324 | sshpam_thread_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 325 | struct pam_response **resp, void *data) |
a5c9cd31 | 326 | { |
05114c74 | 327 | Buffer buffer; |
328 | struct pam_ctxt *ctxt; | |
0a23d79f | 329 | struct pam_response *reply; |
05114c74 | 330 | int i; |
331 | ||
60922169 | 332 | debug3("PAM: %s entering, %d messages", __func__, n); |
0a23d79f | 333 | *resp = NULL; |
334 | ||
d506e25f | 335 | if (data == NULL) { |
336 | error("PAM: conversation function passed a null context"); | |
337 | return (PAM_CONV_ERR); | |
338 | } | |
05114c74 | 339 | ctxt = data; |
340 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
341 | return (PAM_CONV_ERR); | |
0a23d79f | 342 | |
01d35895 | 343 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 344 | return (PAM_CONV_ERR); |
0a23d79f | 345 | |
05114c74 | 346 | buffer_init(&buffer); |
347 | for (i = 0; i < n; ++i) { | |
05114c74 | 348 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
349 | case PAM_PROMPT_ECHO_OFF: | |
aff51935 | 350 | buffer_put_cstring(&buffer, |
0a23d79f | 351 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 352 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 353 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
354 | goto fail; | |
aff51935 | 355 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 356 | goto fail; |
05114c74 | 357 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
358 | goto fail; | |
0a23d79f | 359 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 360 | break; |
361 | case PAM_PROMPT_ECHO_ON: | |
aff51935 | 362 | buffer_put_cstring(&buffer, |
0a23d79f | 363 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 364 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 365 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
366 | goto fail; | |
367 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
368 | goto fail; | |
05114c74 | 369 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
370 | goto fail; | |
0a23d79f | 371 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 372 | break; |
373 | case PAM_ERROR_MSG: | |
aff51935 | 374 | buffer_put_cstring(&buffer, |
0a23d79f | 375 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 376 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 377 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
378 | goto fail; | |
05114c74 | 379 | break; |
380 | case PAM_TEXT_INFO: | |
aff51935 | 381 | buffer_put_cstring(&buffer, |
0a23d79f | 382 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 383 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 384 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
385 | goto fail; | |
05114c74 | 386 | break; |
387 | default: | |
388 | goto fail; | |
a5c9cd31 | 389 | } |
05114c74 | 390 | buffer_clear(&buffer); |
a5c9cd31 | 391 | } |
05114c74 | 392 | buffer_free(&buffer); |
0a23d79f | 393 | *resp = reply; |
05114c74 | 394 | return (PAM_SUCCESS); |
0a23d79f | 395 | |
05114c74 | 396 | fail: |
0a23d79f | 397 | for(i = 0; i < n; i++) { |
398 | if (reply[i].resp != NULL) | |
399 | xfree(reply[i].resp); | |
400 | } | |
401 | xfree(reply); | |
05114c74 | 402 | buffer_free(&buffer); |
403 | return (PAM_CONV_ERR); | |
404 | } | |
a5c9cd31 | 405 | |
05114c74 | 406 | /* |
407 | * Authentication thread. | |
408 | */ | |
409 | static void * | |
410 | sshpam_thread(void *ctxtp) | |
411 | { | |
412 | struct pam_ctxt *ctxt = ctxtp; | |
413 | Buffer buffer; | |
c53917a9 | 414 | struct pam_conv sshpam_conv; |
e4472e7e | 415 | int flags = (options.permit_empty_passwd == 0 ? |
416 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
b4143b2a | 417 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
2212fc98 | 418 | extern char **environ; |
419 | char **env_from_pam; | |
420 | u_int i; | |
05114c74 | 421 | const char *pam_user; |
44171182 | 422 | const char **ptr_pam_user = &pam_user; |
05114c74 | 423 | |
44171182 | 424 | pam_get_item(sshpam_handle, PAM_USER, |
425 | (sshpam_const void **)ptr_pam_user); | |
2212fc98 | 426 | environ[0] = NULL; |
da97d54d | 427 | |
428 | if (sshpam_authctxt != NULL) { | |
429 | setproctitle("%s [pam]", | |
430 | sshpam_authctxt->valid ? pam_user : "unknown"); | |
431 | } | |
05114c74 | 432 | #endif |
a5c9cd31 | 433 | |
c53917a9 | 434 | sshpam_conv.conv = sshpam_thread_conv; |
435 | sshpam_conv.appdata_ptr = ctxt; | |
436 | ||
d948154a | 437 | if (sshpam_authctxt == NULL) |
529d73ab | 438 | fatal("%s: PAM authctxt not initialized", __func__); |
439 | ||
05114c74 | 440 | buffer_init(&buffer); |
441 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
442 | (const void *)&sshpam_conv); | |
443 | if (sshpam_err != PAM_SUCCESS) | |
444 | goto auth_fail; | |
e4472e7e | 445 | sshpam_err = pam_authenticate(sshpam_handle, flags); |
05114c74 | 446 | if (sshpam_err != PAM_SUCCESS) |
447 | goto auth_fail; | |
b3ef7fb7 | 448 | |
2935db92 | 449 | if (compat20) { |
5aa56df0 | 450 | if (!do_pam_account()) { |
451 | sshpam_err = PAM_ACCT_EXPIRED; | |
b3ef7fb7 | 452 | goto auth_fail; |
5aa56df0 | 453 | } |
d948154a | 454 | if (sshpam_authctxt->force_pwchange) { |
b3ef7fb7 | 455 | sshpam_err = pam_chauthtok(sshpam_handle, |
456 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
457 | if (sshpam_err != PAM_SUCCESS) | |
458 | goto auth_fail; | |
c10bb2ce | 459 | sshpam_password_change_required(0); |
b3ef7fb7 | 460 | } |
2935db92 | 461 | } |
b3ef7fb7 | 462 | |
05114c74 | 463 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 464 | |
b4143b2a | 465 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 466 | /* Export variables set by do_pam_account */ |
467 | buffer_put_int(&buffer, sshpam_account_status); | |
d948154a | 468 | buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); |
b3ef7fb7 | 469 | |
2212fc98 | 470 | /* Export any environment strings set in child */ |
471 | for(i = 0; environ[i] != NULL; i++) | |
472 | ; /* Count */ | |
473 | buffer_put_int(&buffer, i); | |
474 | for(i = 0; environ[i] != NULL; i++) | |
475 | buffer_put_cstring(&buffer, environ[i]); | |
476 | ||
477 | /* Export any environment strings set by PAM in child */ | |
478 | env_from_pam = pam_getenvlist(sshpam_handle); | |
479 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
480 | ; /* Count */ | |
481 | buffer_put_int(&buffer, i); | |
482 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
483 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
b4143b2a | 484 | #endif /* UNSUPPORTED_POSIX_THREADS_HACK */ |
2212fc98 | 485 | |
7b2a0de3 | 486 | /* XXX - can't do much about an error here */ |
05114c74 | 487 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
488 | buffer_free(&buffer); | |
489 | pthread_exit(NULL); | |
490 | ||
491 | auth_fail: | |
492 | buffer_put_cstring(&buffer, | |
493 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 494 | /* XXX - can't do much about an error here */ |
5aa56df0 | 495 | if (sshpam_err == PAM_ACCT_EXPIRED) |
496 | ssh_msg_send(ctxt->pam_csock, PAM_ACCT_EXPIRED, &buffer); | |
497 | else | |
498 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); | |
05114c74 | 499 | buffer_free(&buffer); |
500 | pthread_exit(NULL); | |
b6453d99 | 501 | |
05114c74 | 502 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 503 | } |
504 | ||
c6630044 | 505 | void |
506 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 507 | { |
c6630044 | 508 | struct pam_ctxt *ctxt = cleanup_ctxt; |
509 | ||
90f3c272 | 510 | debug3("PAM: %s entering", __func__); |
c6630044 | 511 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
512 | pthread_cancel(ctxt->pam_thread); | |
513 | pthread_join(ctxt->pam_thread, NULL); | |
514 | close(ctxt->pam_psock); | |
515 | close(ctxt->pam_csock); | |
516 | memset(ctxt, 0, sizeof(*ctxt)); | |
517 | cleanup_ctxt = NULL; | |
518 | } | |
05114c74 | 519 | } |
a5c9cd31 | 520 | |
05114c74 | 521 | static int |
44171182 | 522 | sshpam_null_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 523 | struct pam_response **resp, void *data) |
05114c74 | 524 | { |
60922169 | 525 | debug3("PAM: %s entering, %d messages", __func__, n); |
05114c74 | 526 | return (PAM_CONV_ERR); |
527 | } | |
a5c9cd31 | 528 | |
05114c74 | 529 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
530 | ||
ab17aac2 | 531 | static int |
44171182 | 532 | sshpam_store_conv(int n, sshpam_const struct pam_message **msg, |
ab17aac2 | 533 | struct pam_response **resp, void *data) |
534 | { | |
535 | struct pam_response *reply; | |
536 | int i; | |
537 | size_t len; | |
538 | ||
539 | debug3("PAM: %s called with %d messages", __func__, n); | |
540 | *resp = NULL; | |
541 | ||
542 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
543 | return (PAM_CONV_ERR); | |
544 | ||
01d35895 | 545 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
ab17aac2 | 546 | return (PAM_CONV_ERR); |
ab17aac2 | 547 | |
548 | for (i = 0; i < n; ++i) { | |
549 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
550 | case PAM_ERROR_MSG: | |
551 | case PAM_TEXT_INFO: | |
552 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
553 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); | |
554 | buffer_append(&loginmsg, "\n", 1 ); | |
555 | reply[i].resp_retcode = PAM_SUCCESS; | |
556 | break; | |
557 | default: | |
558 | goto fail; | |
559 | } | |
560 | } | |
561 | *resp = reply; | |
562 | return (PAM_SUCCESS); | |
563 | ||
564 | fail: | |
565 | for(i = 0; i < n; i++) { | |
566 | if (reply[i].resp != NULL) | |
567 | xfree(reply[i].resp); | |
568 | } | |
569 | xfree(reply); | |
570 | return (PAM_CONV_ERR); | |
571 | } | |
572 | ||
573 | static struct pam_conv store_conv = { sshpam_store_conv, NULL }; | |
574 | ||
c6630044 | 575 | void |
576 | sshpam_cleanup(void) | |
05114c74 | 577 | { |
05114c74 | 578 | debug("PAM: cleanup"); |
0a23d79f | 579 | if (sshpam_handle == NULL) |
580 | return; | |
05114c74 | 581 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
582 | if (sshpam_cred_established) { | |
583 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
584 | sshpam_cred_established = 0; | |
585 | } | |
586 | if (sshpam_session_open) { | |
587 | pam_close_session(sshpam_handle, PAM_SILENT); | |
588 | sshpam_session_open = 0; | |
a5c9cd31 | 589 | } |
dd1fb864 | 590 | sshpam_authenticated = 0; |
05114c74 | 591 | pam_end(sshpam_handle, sshpam_err); |
592 | sshpam_handle = NULL; | |
a5c9cd31 | 593 | } |
594 | ||
05114c74 | 595 | static int |
529d73ab | 596 | sshpam_init(Authctxt *authctxt) |
a5c9cd31 | 597 | { |
74678fb9 | 598 | extern char *__progname; |
529d73ab | 599 | const char *pam_rhost, *pam_user, *user = authctxt->user; |
44171182 | 600 | const char **ptr_pam_user = &pam_user; |
05114c74 | 601 | |
602 | if (sshpam_handle != NULL) { | |
603 | /* We already have a PAM context; check if the user matches */ | |
604 | sshpam_err = pam_get_item(sshpam_handle, | |
44171182 | 605 | PAM_USER, (sshpam_const void **)ptr_pam_user); |
05114c74 | 606 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) |
607 | return (0); | |
05114c74 | 608 | pam_end(sshpam_handle, sshpam_err); |
609 | sshpam_handle = NULL; | |
610 | } | |
611 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 612 | sshpam_err = |
ba6dd90e | 613 | pam_start(SSHD_PAM_SERVICE, user, &store_conv, &sshpam_handle); |
d948154a | 614 | sshpam_authctxt = authctxt; |
529d73ab | 615 | |
5ff453c0 | 616 | if (sshpam_err != PAM_SUCCESS) { |
617 | pam_end(sshpam_handle, sshpam_err); | |
618 | sshpam_handle = NULL; | |
05114c74 | 619 | return (-1); |
5ff453c0 | 620 | } |
c5a7d788 | 621 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 622 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 623 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 624 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 625 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 626 | sshpam_handle = NULL; |
627 | return (-1); | |
628 | } | |
629 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 630 | /* |
631 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
632 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 633 | * may not even set one (for tty-less connections) |
aff51935 | 634 | */ |
5ff453c0 | 635 | debug("PAM: setting PAM_TTY to \"ssh\""); |
636 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 637 | if (sshpam_err != PAM_SUCCESS) { |
638 | pam_end(sshpam_handle, sshpam_err); | |
639 | sshpam_handle = NULL; | |
640 | return (-1); | |
a5c9cd31 | 641 | } |
5ff453c0 | 642 | #endif |
05114c74 | 643 | return (0); |
a5c9cd31 | 644 | } |
645 | ||
05114c74 | 646 | static void * |
647 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 648 | { |
05114c74 | 649 | struct pam_ctxt *ctxt; |
650 | int socks[2]; | |
2b87da3b | 651 | |
90f3c272 | 652 | debug3("PAM: %s entering", __func__); |
5aa56df0 | 653 | /* |
654 | * Refuse to start if we don't have PAM enabled or do_pam_account | |
655 | * has previously failed. | |
656 | */ | |
657 | if (!options.use_pam || sshpam_account_status == 0) | |
7fceb20d | 658 | return NULL; |
659 | ||
05114c74 | 660 | /* Initialize PAM */ |
529d73ab | 661 | if (sshpam_init(authctxt) == -1) { |
05114c74 | 662 | error("PAM: initialization failed"); |
663 | return (NULL); | |
664 | } | |
5c377b3b | 665 | |
05114c74 | 666 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 667 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 668 | |
669 | /* Start the authentication thread */ | |
670 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
671 | error("PAM: failed create sockets: %s", strerror(errno)); | |
672 | xfree(ctxt); | |
673 | return (NULL); | |
674 | } | |
675 | ctxt->pam_psock = socks[0]; | |
676 | ctxt->pam_csock = socks[1]; | |
677 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
678 | error("PAM: failed to start authentication thread: %s", | |
679 | strerror(errno)); | |
680 | close(socks[0]); | |
681 | close(socks[1]); | |
682 | xfree(ctxt); | |
683 | return (NULL); | |
a5c9cd31 | 684 | } |
c6630044 | 685 | cleanup_ctxt = ctxt; |
05114c74 | 686 | return (ctxt); |
687 | } | |
a5c9cd31 | 688 | |
05114c74 | 689 | static int |
690 | sshpam_query(void *ctx, char **name, char **info, | |
691 | u_int *num, char ***prompts, u_int **echo_on) | |
692 | { | |
693 | Buffer buffer; | |
694 | struct pam_ctxt *ctxt = ctx; | |
695 | size_t plen; | |
696 | u_char type; | |
697 | char *msg; | |
bbe58934 | 698 | size_t len, mlen; |
05114c74 | 699 | |
90f3c272 | 700 | debug3("PAM: %s entering", __func__); |
05114c74 | 701 | buffer_init(&buffer); |
702 | *name = xstrdup(""); | |
703 | *info = xstrdup(""); | |
704 | *prompts = xmalloc(sizeof(char *)); | |
705 | **prompts = NULL; | |
706 | plen = 0; | |
707 | *echo_on = xmalloc(sizeof(u_int)); | |
708 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
709 | type = buffer_get_char(&buffer); | |
710 | msg = buffer_get_string(&buffer, NULL); | |
bbe58934 | 711 | mlen = strlen(msg); |
05114c74 | 712 | switch (type) { |
713 | case PAM_PROMPT_ECHO_ON: | |
714 | case PAM_PROMPT_ECHO_OFF: | |
715 | *num = 1; | |
bbe58934 | 716 | len = plen + mlen + 1; |
c5d10563 | 717 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 718 | strlcpy(**prompts + plen, msg, len - plen); |
719 | plen += mlen; | |
05114c74 | 720 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
721 | xfree(msg); | |
722 | return (0); | |
723 | case PAM_ERROR_MSG: | |
724 | case PAM_TEXT_INFO: | |
725 | /* accumulate messages */ | |
bbe58934 | 726 | len = plen + mlen + 2; |
c5d10563 | 727 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 728 | strlcpy(**prompts + plen, msg, len - plen); |
729 | plen += mlen; | |
730 | strlcat(**prompts + plen, "\n", len - plen); | |
731 | plen++; | |
05114c74 | 732 | xfree(msg); |
5daf7064 | 733 | break; |
5aa56df0 | 734 | case PAM_ACCT_EXPIRED: |
735 | sshpam_account_status = 0; | |
736 | /* FALLTHROUGH */ | |
05114c74 | 737 | case PAM_AUTH_ERR: |
5aa56df0 | 738 | debug3("PAM: %s", pam_strerror(sshpam_handle, type)); |
cafa6a80 | 739 | if (**prompts != NULL && strlen(**prompts) != 0) { |
740 | *info = **prompts; | |
741 | **prompts = NULL; | |
742 | *num = 0; | |
743 | **echo_on = 0; | |
744 | ctxt->pam_done = -1; | |
08a3f952 | 745 | xfree(msg); |
cafa6a80 | 746 | return 0; |
747 | } | |
748 | /* FALLTHROUGH */ | |
749 | case PAM_SUCCESS: | |
05114c74 | 750 | if (**prompts != NULL) { |
751 | /* drain any accumulated messages */ | |
3eaf3960 | 752 | debug("PAM: %s", **prompts); |
753 | buffer_append(&loginmsg, **prompts, | |
754 | strlen(**prompts)); | |
05114c74 | 755 | xfree(**prompts); |
756 | **prompts = NULL; | |
757 | } | |
758 | if (type == PAM_SUCCESS) { | |
2d5104e2 | 759 | if (!sshpam_authctxt->valid || |
760 | (sshpam_authctxt->pw->pw_uid == 0 && | |
761 | options.permit_root_login != PERMIT_YES)) | |
af0e5c2f | 762 | fatal("Internal error: PAM auth " |
763 | "succeeded when it should have " | |
764 | "failed"); | |
2212fc98 | 765 | import_environments(&buffer); |
05114c74 | 766 | *num = 0; |
767 | **echo_on = 0; | |
768 | ctxt->pam_done = 1; | |
769 | xfree(msg); | |
770 | return (0); | |
771 | } | |
1e08e787 | 772 | error("PAM: %s for %s%.100s from %.100s", msg, |
773 | sshpam_authctxt->valid ? "" : "illegal user ", | |
774 | sshpam_authctxt->user, | |
775 | get_remote_name_or_ip(utmp_len, options.use_dns)); | |
e250770b | 776 | /* FALLTHROUGH */ |
5daf7064 | 777 | default: |
05114c74 | 778 | *num = 0; |
779 | **echo_on = 0; | |
780 | xfree(msg); | |
781 | ctxt->pam_done = -1; | |
782 | return (-1); | |
783 | } | |
a5c9cd31 | 784 | } |
05114c74 | 785 | return (-1); |
a5c9cd31 | 786 | } |
787 | ||
05114c74 | 788 | /* XXX - see also comment in auth-chall.c:verify_response */ |
789 | static int | |
790 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 791 | { |
05114c74 | 792 | Buffer buffer; |
793 | struct pam_ctxt *ctxt = ctx; | |
794 | ||
912acf53 | 795 | debug2("PAM: %s entering, %u responses", __func__, num); |
05114c74 | 796 | switch (ctxt->pam_done) { |
797 | case 1: | |
798 | sshpam_authenticated = 1; | |
799 | return (0); | |
800 | case 0: | |
801 | break; | |
802 | default: | |
803 | return (-1); | |
a5c9cd31 | 804 | } |
05114c74 | 805 | if (num != 1) { |
806 | error("PAM: expected one response, got %u", num); | |
807 | return (-1); | |
808 | } | |
809 | buffer_init(&buffer); | |
2d5104e2 | 810 | if (sshpam_authctxt->valid && |
811 | (sshpam_authctxt->pw->pw_uid != 0 || | |
ed9e8be3 | 812 | options.permit_root_login == PERMIT_YES)) |
af0e5c2f | 813 | buffer_put_cstring(&buffer, *resp); |
814 | else | |
815 | buffer_put_cstring(&buffer, badpw); | |
7b2a0de3 | 816 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
817 | buffer_free(&buffer); | |
818 | return (-1); | |
819 | } | |
05114c74 | 820 | buffer_free(&buffer); |
821 | return (1); | |
a5c9cd31 | 822 | } |
823 | ||
05114c74 | 824 | static void |
825 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 826 | { |
05114c74 | 827 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 828 | |
90f3c272 | 829 | debug3("PAM: %s entering", __func__); |
c6630044 | 830 | sshpam_thread_cleanup(); |
05114c74 | 831 | xfree(ctxt); |
832 | /* | |
833 | * We don't call sshpam_cleanup() here because we may need the PAM | |
834 | * handle at a later stage, e.g. when setting up a session. It's | |
835 | * still on the cleanup list, so pam_end() *will* be called before | |
836 | * the server process terminates. | |
837 | */ | |
ad55cd03 | 838 | } |
839 | ||
05114c74 | 840 | KbdintDevice sshpam_device = { |
841 | "pam", | |
842 | sshpam_init_ctx, | |
843 | sshpam_query, | |
844 | sshpam_respond, | |
845 | sshpam_free_ctx | |
846 | }; | |
847 | ||
848 | KbdintDevice mm_sshpam_device = { | |
849 | "pam", | |
850 | mm_sshpam_init_ctx, | |
851 | mm_sshpam_query, | |
852 | mm_sshpam_respond, | |
853 | mm_sshpam_free_ctx | |
854 | }; | |
2919e060 | 855 | |
2b87da3b | 856 | /* |
05114c74 | 857 | * This replaces auth-pam.c |
ad55cd03 | 858 | */ |
05114c74 | 859 | void |
529d73ab | 860 | start_pam(Authctxt *authctxt) |
ad55cd03 | 861 | { |
817e6d38 | 862 | if (!options.use_pam) |
863 | fatal("PAM: initialisation requested when UsePAM=no"); | |
864 | ||
529d73ab | 865 | if (sshpam_init(authctxt) == -1) |
05114c74 | 866 | fatal("PAM: initialisation failed"); |
a5c9cd31 | 867 | } |
868 | ||
05114c74 | 869 | void |
870 | finish_pam(void) | |
a5c9cd31 | 871 | { |
c6630044 | 872 | sshpam_cleanup(); |
a5c9cd31 | 873 | } |
874 | ||
5b9e2464 | 875 | u_int |
876 | do_pam_account(void) | |
a5c9cd31 | 877 | { |
ba6dd90e | 878 | debug("%s: called", __func__); |
b3ef7fb7 | 879 | if (sshpam_account_status != -1) |
880 | return (sshpam_account_status); | |
881 | ||
5b9e2464 | 882 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
ba6dd90e | 883 | debug3("PAM: %s pam_acct_mgmt = %d (%s)", __func__, sshpam_err, |
884 | pam_strerror(sshpam_handle, sshpam_err)); | |
d1cf9a87 | 885 | |
b3ef7fb7 | 886 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { |
887 | sshpam_account_status = 0; | |
888 | return (sshpam_account_status); | |
5b9e2464 | 889 | } |
890 | ||
b3ef7fb7 | 891 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
c10bb2ce | 892 | sshpam_password_change_required(1); |
b3ef7fb7 | 893 | |
894 | sshpam_account_status = 1; | |
895 | return (sshpam_account_status); | |
05114c74 | 896 | } |
46c76c63 | 897 | |
49e82bb9 | 898 | void |
899 | do_pam_set_tty(const char *tty) | |
900 | { | |
26b3608b | 901 | if (tty != NULL) { |
902 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
903 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
904 | if (sshpam_err != PAM_SUCCESS) | |
905 | fatal("PAM: failed to set PAM_TTY: %s", | |
906 | pam_strerror(sshpam_handle, sshpam_err)); | |
907 | } | |
05114c74 | 908 | } |
cbd7492e | 909 | |
05114c74 | 910 | void |
911 | do_pam_setcred(int init) | |
912 | { | |
913 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
ba6dd90e | 914 | (const void *)&store_conv); |
05114c74 | 915 | if (sshpam_err != PAM_SUCCESS) |
916 | fatal("PAM: failed to set PAM_CONV: %s", | |
917 | pam_strerror(sshpam_handle, sshpam_err)); | |
918 | if (init) { | |
919 | debug("PAM: establishing credentials"); | |
920 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
921 | } else { | |
922 | debug("PAM: reinitializing credentials"); | |
923 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
924 | } | |
925 | if (sshpam_err == PAM_SUCCESS) { | |
926 | sshpam_cred_established = 1; | |
927 | return; | |
928 | } | |
929 | if (sshpam_authenticated) | |
930 | fatal("PAM: pam_setcred(): %s", | |
931 | pam_strerror(sshpam_handle, sshpam_err)); | |
932 | else | |
933 | debug("PAM: pam_setcred(): %s", | |
934 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 935 | } |
936 | ||
05114c74 | 937 | static int |
44171182 | 938 | sshpam_tty_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 939 | struct pam_response **resp, void *data) |
ee48c949 | 940 | { |
05114c74 | 941 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 942 | struct pam_response *reply; |
ee48c949 | 943 | int i; |
944 | ||
60922169 | 945 | debug3("PAM: %s called with %d messages", __func__, n); |
946 | ||
0a23d79f | 947 | *resp = NULL; |
948 | ||
3eaf3960 | 949 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 950 | return (PAM_CONV_ERR); |
0a23d79f | 951 | |
01d35895 | 952 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 953 | return (PAM_CONV_ERR); |
0a23d79f | 954 | |
05114c74 | 955 | for (i = 0; i < n; ++i) { |
956 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
957 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 958 | reply[i].resp = |
aff51935 | 959 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 960 | RP_ALLOW_STDIN); |
0a23d79f | 961 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 962 | break; |
963 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 964 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 965 | fgets(input, sizeof input, stdin); |
8936b151 | 966 | if ((reply[i].resp = strdup(input)) == NULL) |
967 | goto fail; | |
0a23d79f | 968 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 969 | break; |
970 | case PAM_ERROR_MSG: | |
971 | case PAM_TEXT_INFO: | |
74117b26 | 972 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 973 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 974 | break; |
975 | default: | |
976 | goto fail; | |
977 | } | |
ee48c949 | 978 | } |
0a23d79f | 979 | *resp = reply; |
05114c74 | 980 | return (PAM_SUCCESS); |
0a23d79f | 981 | |
05114c74 | 982 | fail: |
0a23d79f | 983 | for(i = 0; i < n; i++) { |
984 | if (reply[i].resp != NULL) | |
985 | xfree(reply[i].resp); | |
986 | } | |
987 | xfree(reply); | |
05114c74 | 988 | return (PAM_CONV_ERR); |
ee48c949 | 989 | } |
990 | ||
8600a4ab | 991 | static struct pam_conv tty_conv = { sshpam_tty_conv, NULL }; |
3eaf3960 | 992 | |
05114c74 | 993 | /* |
994 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
995 | * support that | |
996 | */ | |
997 | void | |
998 | do_pam_chauthtok(void) | |
a5c9cd31 | 999 | { |
05114c74 | 1000 | if (use_privsep) |
5b9e2464 | 1001 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 1002 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 1003 | (const void *)&tty_conv); |
05114c74 | 1004 | if (sshpam_err != PAM_SUCCESS) |
1005 | fatal("PAM: failed to set PAM_CONV: %s", | |
1006 | pam_strerror(sshpam_handle, sshpam_err)); | |
1007 | debug("PAM: changing password"); | |
1008 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
1009 | if (sshpam_err != PAM_SUCCESS) | |
1010 | fatal("PAM: pam_chauthtok(): %s", | |
1011 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 1012 | } |
1013 | ||
3eaf3960 | 1014 | void |
1015 | do_pam_session(void) | |
1016 | { | |
dd1fb864 | 1017 | debug3("PAM: opening session"); |
aff51935 | 1018 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
ef687c66 | 1019 | (const void *)&store_conv); |
3eaf3960 | 1020 | if (sshpam_err != PAM_SUCCESS) |
1021 | fatal("PAM: failed to set PAM_CONV: %s", | |
1022 | pam_strerror(sshpam_handle, sshpam_err)); | |
1023 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
abdec250 | 1024 | if (sshpam_err == PAM_SUCCESS) |
1025 | sshpam_session_open = 1; | |
1026 | else { | |
1027 | sshpam_session_open = 0; | |
1028 | disable_forwarding(); | |
1029 | error("PAM: pam_open_session(): %s", | |
3eaf3960 | 1030 | pam_strerror(sshpam_handle, sshpam_err)); |
abdec250 | 1031 | } |
1032 | ||
1033 | } | |
1034 | ||
1035 | int | |
1036 | is_pam_session_open(void) | |
1037 | { | |
1038 | return sshpam_session_open; | |
3eaf3960 | 1039 | } |
1040 | ||
aff51935 | 1041 | /* |
749560dd | 1042 | * Set a PAM environment string. We need to do this so that the session |
1043 | * modules can handle things like Kerberos/GSI credentials that appear | |
1044 | * during the ssh authentication process. | |
1045 | */ | |
749560dd | 1046 | int |
aff51935 | 1047 | do_pam_putenv(char *name, char *value) |
749560dd | 1048 | { |
749560dd | 1049 | int ret = 1; |
b6453d99 | 1050 | #ifdef HAVE_PAM_PUTENV |
263c65df | 1051 | char *compound; |
1052 | size_t len; | |
1053 | ||
1054 | len = strlen(name) + strlen(value) + 2; | |
1055 | compound = xmalloc(len); | |
1056 | ||
1057 | snprintf(compound, len, "%s=%s", name, value); | |
1058 | ret = pam_putenv(sshpam_handle, compound); | |
1059 | xfree(compound); | |
749560dd | 1060 | #endif |
263c65df | 1061 | |
749560dd | 1062 | return (ret); |
1063 | } | |
1064 | ||
2212fc98 | 1065 | char ** |
1066 | fetch_pam_child_environment(void) | |
1067 | { | |
1068 | return sshpam_env; | |
1069 | } | |
1070 | ||
05114c74 | 1071 | char ** |
1072 | fetch_pam_environment(void) | |
1073 | { | |
05114c74 | 1074 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 1075 | } |
5c377b3b | 1076 | |
05114c74 | 1077 | void |
1078 | free_pam_environment(char **env) | |
1079 | { | |
1080 | char **envp; | |
5daf7064 | 1081 | |
0eb6370a | 1082 | if (env == NULL) |
1083 | return; | |
1084 | ||
05114c74 | 1085 | for (envp = env; *envp; envp++) |
1086 | xfree(*envp); | |
1087 | xfree(env); | |
a5c9cd31 | 1088 | } |
1089 | ||
5de92f17 | 1090 | /* |
1091 | * "Blind" conversation function for password authentication. Assumes that | |
1092 | * echo-off prompts are for the password and stores messages for later | |
1093 | * display. | |
1094 | */ | |
1095 | static int | |
44171182 | 1096 | sshpam_passwd_conv(int n, sshpam_const struct pam_message **msg, |
5de92f17 | 1097 | struct pam_response **resp, void *data) |
1098 | { | |
1099 | struct pam_response *reply; | |
1100 | int i; | |
1101 | size_t len; | |
1102 | ||
1103 | debug3("PAM: %s called with %d messages", __func__, n); | |
1104 | ||
1105 | *resp = NULL; | |
1106 | ||
1107 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
1108 | return (PAM_CONV_ERR); | |
1109 | ||
1110 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
1111 | return (PAM_CONV_ERR); | |
1112 | memset(reply, 0, n * sizeof(*reply)); | |
1113 | ||
1114 | for (i = 0; i < n; ++i) { | |
1115 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
1116 | case PAM_PROMPT_ECHO_OFF: | |
1117 | if (sshpam_password == NULL) | |
1118 | goto fail; | |
8936b151 | 1119 | if ((reply[i].resp = strdup(sshpam_password)) == NULL) |
1120 | goto fail; | |
5de92f17 | 1121 | reply[i].resp_retcode = PAM_SUCCESS; |
1122 | break; | |
1123 | case PAM_ERROR_MSG: | |
1124 | case PAM_TEXT_INFO: | |
1125 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
1126 | if (len > 0) { | |
1127 | buffer_append(&loginmsg, | |
1128 | PAM_MSG_MEMBER(msg, i, msg), len); | |
1129 | buffer_append(&loginmsg, "\n", 1); | |
1130 | } | |
8936b151 | 1131 | if ((reply[i].resp = strdup("")) == NULL) |
1132 | goto fail; | |
5de92f17 | 1133 | reply[i].resp_retcode = PAM_SUCCESS; |
1134 | break; | |
1135 | default: | |
1136 | goto fail; | |
1137 | } | |
1138 | } | |
1139 | *resp = reply; | |
1140 | return (PAM_SUCCESS); | |
1141 | ||
d1cf9a87 | 1142 | fail: |
5de92f17 | 1143 | for(i = 0; i < n; i++) { |
1144 | if (reply[i].resp != NULL) | |
1145 | xfree(reply[i].resp); | |
1146 | } | |
1147 | xfree(reply); | |
1148 | return (PAM_CONV_ERR); | |
1149 | } | |
1150 | ||
1151 | static struct pam_conv passwd_conv = { sshpam_passwd_conv, NULL }; | |
1152 | ||
1153 | /* | |
1154 | * Attempt password authentication via PAM | |
1155 | */ | |
1156 | int | |
1157 | sshpam_auth_passwd(Authctxt *authctxt, const char *password) | |
1158 | { | |
1159 | int flags = (options.permit_empty_passwd == 0 ? | |
1160 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
1161 | ||
1162 | if (!options.use_pam || sshpam_handle == NULL) | |
1163 | fatal("PAM: %s called when PAM disabled or failed to " | |
1164 | "initialise.", __func__); | |
1165 | ||
1166 | sshpam_password = password; | |
1167 | sshpam_authctxt = authctxt; | |
1168 | ||
0e716148 | 1169 | /* |
1170 | * If the user logging in is invalid, or is root but is not permitted | |
1171 | * by PermitRootLogin, use an invalid password to prevent leaking | |
1172 | * information via timing (eg if the PAM config has a delay on fail). | |
1173 | */ | |
2d5104e2 | 1174 | if (!authctxt->valid || (authctxt->pw->pw_uid == 0 && |
ed9e8be3 | 1175 | options.permit_root_login != PERMIT_YES)) |
0e716148 | 1176 | sshpam_password = badpw; |
1177 | ||
5de92f17 | 1178 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
1179 | (const void *)&passwd_conv); | |
1180 | if (sshpam_err != PAM_SUCCESS) | |
1181 | fatal("PAM: %s: failed to set PAM_CONV: %s", __func__, | |
1182 | pam_strerror(sshpam_handle, sshpam_err)); | |
1183 | ||
1184 | sshpam_err = pam_authenticate(sshpam_handle, flags); | |
1185 | sshpam_password = NULL; | |
2d5104e2 | 1186 | if (sshpam_err == PAM_SUCCESS && authctxt->valid) { |
5de92f17 | 1187 | debug("PAM: password authentication accepted for %.100s", |
1188 | authctxt->user); | |
ed9e8be3 | 1189 | return 1; |
5de92f17 | 1190 | } else { |
1191 | debug("PAM: password authentication failed for %.100s: %s", | |
1192 | authctxt->valid ? authctxt->user : "an illegal user", | |
1193 | pam_strerror(sshpam_handle, sshpam_err)); | |
1194 | return 0; | |
1195 | } | |
1196 | } | |
a5c9cd31 | 1197 | #endif /* USE_PAM */ |