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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> |
28cb0a43 | 57 | #include <string.h> |
58 | #include <unistd.h> | |
b5b88c19 | 59 | |
a5c9cd31 | 60 | #ifdef USE_PAM |
2511d104 | 61 | #if defined(HAVE_SECURITY_PAM_APPL_H) |
05114c74 | 62 | #include <security/pam_appl.h> |
2511d104 | 63 | #elif defined (HAVE_PAM_PAM_APPL_H) |
64 | #include <pam/pam_appl.h> | |
65 | #endif | |
05114c74 | 66 | |
44171182 | 67 | /* OpenGroup RFC86.0 and XSSO specify no "const" on arguments */ |
68 | #ifdef PAM_SUN_CODEBASE | |
69 | # define sshpam_const /* Solaris, HP-UX, AIX */ | |
70 | #else | |
71 | # define sshpam_const const /* LinuxPAM, OpenPAM */ | |
72 | #endif | |
73 | ||
8bdc7aa0 | 74 | /* Ambiguity in spec: is it an array of pointers or a pointer to an array? */ |
75 | #ifdef PAM_SUN_CODEBASE | |
76 | # define PAM_MSG_MEMBER(msg, n, member) ((*(msg))[(n)].member) | |
77 | #else | |
78 | # define PAM_MSG_MEMBER(msg, n, member) ((msg)[(n)]->member) | |
79 | #endif | |
80 | ||
00a017bd | 81 | #include "xmalloc.h" |
82 | #include "buffer.h" | |
83 | #include "key.h" | |
84 | #include "hostfile.h" | |
fde58bd4 | 85 | #include "auth.h" |
5c377b3b | 86 | #include "auth-pam.h" |
42f11eb2 | 87 | #include "canohost.h" |
05114c74 | 88 | #include "log.h" |
05114c74 | 89 | #include "msg.h" |
90 | #include "packet.h" | |
0f3ee929 | 91 | #include "misc.h" |
05114c74 | 92 | #include "servconf.h" |
93 | #include "ssh2.h" | |
5b9e2464 | 94 | #include "auth-options.h" |
00a017bd | 95 | #ifdef GSSAPI |
96 | #include "ssh-gss.h" | |
97 | #endif | |
98 | #include "monitor_wrap.h" | |
a5c9cd31 | 99 | |
7fceb20d | 100 | extern ServerOptions options; |
3eaf3960 | 101 | extern Buffer loginmsg; |
b3ef7fb7 | 102 | extern int compat20; |
1e08e787 | 103 | extern u_int utmp_len; |
7fceb20d | 104 | |
b4143b2a | 105 | /* so we don't silently change behaviour */ |
05114c74 | 106 | #ifdef USE_POSIX_THREADS |
b4143b2a | 107 | # error "USE_POSIX_THREADS replaced by UNSUPPORTED_POSIX_THREADS_HACK" |
108 | #endif | |
109 | ||
110 | /* | |
111 | * Formerly known as USE_POSIX_THREADS, using this is completely unsupported | |
112 | * and generally a bad idea. Use at own risk and do not expect support if | |
113 | * this breaks. | |
114 | */ | |
115 | #ifdef UNSUPPORTED_POSIX_THREADS_HACK | |
05114c74 | 116 | #include <pthread.h> |
117 | /* | |
aff51935 | 118 | * Avoid namespace clash when *not* using pthreads for systems *with* |
119 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
05114c74 | 120 | * (e.g. Linux) |
121 | */ | |
aff51935 | 122 | typedef pthread_t sp_pthread_t; |
05114c74 | 123 | #else |
e47e681f | 124 | typedef pid_t sp_pthread_t; |
125 | #endif | |
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 *); | |
135 | static struct pam_ctxt *cleanup_ctxt; | |
136 | ||
b4143b2a | 137 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
05114c74 | 138 | /* |
139 | * Simulate threads with processes. | |
140 | */ | |
a5c9cd31 | 141 | |
100e6910 | 142 | static int sshpam_thread_status = -1; |
143 | static mysig_t sshpam_oldsig; | |
144 | ||
d1cf9a87 | 145 | static void |
100e6910 | 146 | sshpam_sigchld_handler(int sig) |
147 | { | |
8a956cda | 148 | signal(SIGCHLD, SIG_DFL); |
28b49ff8 | 149 | if (cleanup_ctxt == NULL) |
150 | return; /* handler called after PAM cleanup, shouldn't happen */ | |
8a956cda | 151 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG) |
ed9e8be3 | 152 | <= 0) { |
8a956cda | 153 | /* PAM thread has not exitted, privsep slave must have */ |
154 | kill(cleanup_ctxt->pam_thread, SIGTERM); | |
155 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) | |
930d0441 | 156 | <= 0) |
8a956cda | 157 | return; /* could not wait */ |
158 | } | |
100e6910 | 159 | if (WIFSIGNALED(sshpam_thread_status) && |
160 | WTERMSIG(sshpam_thread_status) == SIGTERM) | |
161 | return; /* terminated by pthread_cancel */ | |
162 | if (!WIFEXITED(sshpam_thread_status)) | |
163 | fatal("PAM: authentication thread exited unexpectedly"); | |
164 | if (WEXITSTATUS(sshpam_thread_status) != 0) | |
165 | fatal("PAM: authentication thread exited uncleanly"); | |
166 | } | |
167 | ||
28cb0a43 | 168 | /* ARGSUSED */ |
05114c74 | 169 | static void |
28cb0a43 | 170 | pthread_exit(void *value) |
05114c74 | 171 | { |
172 | _exit(0); | |
173 | } | |
5daf7064 | 174 | |
28cb0a43 | 175 | /* ARGSUSED */ |
05114c74 | 176 | static int |
28cb0a43 | 177 | pthread_create(sp_pthread_t *thread, const void *attr, |
05114c74 | 178 | void *(*thread_start)(void *), void *arg) |
179 | { | |
180 | pid_t pid; | |
5d001c70 | 181 | struct pam_ctxt *ctx = arg; |
05114c74 | 182 | |
355fbf31 | 183 | sshpam_thread_status = -1; |
05114c74 | 184 | switch ((pid = fork())) { |
185 | case -1: | |
186 | error("fork(): %s", strerror(errno)); | |
187 | return (-1); | |
188 | case 0: | |
5d001c70 | 189 | close(ctx->pam_psock); |
190 | ctx->pam_psock = -1; | |
05114c74 | 191 | thread_start(arg); |
192 | _exit(1); | |
193 | default: | |
194 | *thread = pid; | |
5d001c70 | 195 | close(ctx->pam_csock); |
196 | ctx->pam_csock = -1; | |
100e6910 | 197 | sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); |
05114c74 | 198 | return (0); |
199 | } | |
200 | } | |
a5c9cd31 | 201 | |
05114c74 | 202 | static int |
203 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 204 | { |
28b49ff8 | 205 | signal(SIGCHLD, sshpam_oldsig); |
05114c74 | 206 | return (kill(thread, SIGTERM)); |
8c9fe09e | 207 | } |
208 | ||
28cb0a43 | 209 | /* ARGSUSED */ |
05114c74 | 210 | static int |
28cb0a43 | 211 | pthread_join(sp_pthread_t thread, void **value) |
8c9fe09e | 212 | { |
05114c74 | 213 | int status; |
214 | ||
100e6910 | 215 | if (sshpam_thread_status != -1) |
216 | return (sshpam_thread_status); | |
217 | signal(SIGCHLD, sshpam_oldsig); | |
05114c74 | 218 | waitpid(thread, &status, 0); |
219 | return (status); | |
8c9fe09e | 220 | } |
05114c74 | 221 | #endif |
222 | ||
223 | ||
0a23d79f | 224 | static pam_handle_t *sshpam_handle = NULL; |
225 | static int sshpam_err = 0; | |
226 | static int sshpam_authenticated = 0; | |
0a23d79f | 227 | static int sshpam_session_open = 0; |
228 | static int sshpam_cred_established = 0; | |
b3ef7fb7 | 229 | static int sshpam_account_status = -1; |
2212fc98 | 230 | static char **sshpam_env = NULL; |
d948154a | 231 | static Authctxt *sshpam_authctxt = NULL; |
5de92f17 | 232 | static const char *sshpam_password = NULL; |
af0e5c2f | 233 | static char badpw[] = "\b\n\r\177INCORRECT"; |
05114c74 | 234 | |
2212fc98 | 235 | /* Some PAM implementations don't implement this */ |
236 | #ifndef HAVE_PAM_GETENVLIST | |
237 | static char ** | |
238 | pam_getenvlist(pam_handle_t *pamh) | |
239 | { | |
240 | /* | |
aff51935 | 241 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 242 | * for platforms without pam_getenvlist by searching for known |
243 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
244 | */ | |
245 | return NULL; | |
246 | } | |
247 | #endif | |
248 | ||
059d3165 | 249 | /* |
250 | * Some platforms, notably Solaris, do not enforce password complexity | |
251 | * rules during pam_chauthtok() if the real uid of the calling process | |
252 | * is 0, on the assumption that it's being called by "passwd" run by root. | |
253 | * This wraps pam_chauthtok and sets/restore the real uid so PAM will do | |
254 | * the right thing. | |
255 | */ | |
256 | #ifdef SSHPAM_CHAUTHTOK_NEEDS_RUID | |
257 | static int | |
258 | sshpam_chauthtok_ruid(pam_handle_t *pamh, int flags) | |
259 | { | |
260 | int result; | |
261 | ||
262 | if (sshpam_authctxt == NULL) | |
263 | fatal("PAM: sshpam_authctxt not initialized"); | |
264 | if (setreuid(sshpam_authctxt->pw->pw_uid, -1) == -1) | |
265 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
266 | result = pam_chauthtok(pamh, flags); | |
267 | if (setreuid(0, -1) == -1) | |
268 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
269 | return result; | |
270 | } | |
271 | # define pam_chauthtok(a,b) (sshpam_chauthtok_ruid((a), (b))) | |
272 | #endif | |
273 | ||
b3ef7fb7 | 274 | void |
c10bb2ce | 275 | sshpam_password_change_required(int reqd) |
b3ef7fb7 | 276 | { |
90f3c272 | 277 | debug3("%s %d", __func__, reqd); |
d948154a | 278 | if (sshpam_authctxt == NULL) |
529d73ab | 279 | fatal("%s: PAM authctxt not initialized", __func__); |
d948154a | 280 | sshpam_authctxt->force_pwchange = reqd; |
b3ef7fb7 | 281 | if (reqd) { |
282 | no_port_forwarding_flag |= 2; | |
283 | no_agent_forwarding_flag |= 2; | |
284 | no_x11_forwarding_flag |= 2; | |
285 | } else { | |
286 | no_port_forwarding_flag &= ~2; | |
287 | no_agent_forwarding_flag &= ~2; | |
288 | no_x11_forwarding_flag &= ~2; | |
b3ef7fb7 | 289 | } |
290 | } | |
dd1fb864 | 291 | |
2212fc98 | 292 | /* Import regular and PAM environment from subprocess */ |
293 | static void | |
294 | import_environments(Buffer *b) | |
295 | { | |
296 | char *env; | |
297 | u_int i, num_env; | |
298 | int err; | |
299 | ||
90f3c272 | 300 | debug3("PAM: %s entering", __func__); |
301 | ||
b4143b2a | 302 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 303 | /* Import variables set by do_pam_account */ |
304 | sshpam_account_status = buffer_get_int(b); | |
c10bb2ce | 305 | sshpam_password_change_required(buffer_get_int(b)); |
b3ef7fb7 | 306 | |
2212fc98 | 307 | /* Import environment from subprocess */ |
308 | num_env = buffer_get_int(b); | |
01d35895 | 309 | if (num_env > 1024) |
310 | fatal("%s: received %u environment variables, expected <= 1024", | |
311 | __func__, num_env); | |
312 | sshpam_env = xcalloc(num_env + 1, sizeof(*sshpam_env)); | |
2212fc98 | 313 | debug3("PAM: num env strings %d", num_env); |
314 | for(i = 0; i < num_env; i++) | |
315 | sshpam_env[i] = buffer_get_string(b, NULL); | |
316 | ||
317 | sshpam_env[num_env] = NULL; | |
318 | ||
319 | /* Import PAM environment from subprocess */ | |
320 | num_env = buffer_get_int(b); | |
321 | debug("PAM: num PAM env strings %d", num_env); | |
322 | for(i = 0; i < num_env; i++) { | |
323 | env = buffer_get_string(b, NULL); | |
324 | ||
f79a6165 | 325 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 326 | /* Errors are not fatal here */ |
327 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
328 | error("PAM: pam_putenv: %s", | |
329 | pam_strerror(sshpam_handle, sshpam_err)); | |
330 | } | |
f79a6165 | 331 | #endif |
2212fc98 | 332 | } |
a1e0095d | 333 | #endif |
2212fc98 | 334 | } |
335 | ||
ad55cd03 | 336 | /* |
05114c74 | 337 | * Conversation function for authentication thread. |
ad55cd03 | 338 | */ |
05114c74 | 339 | static int |
44171182 | 340 | sshpam_thread_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 341 | struct pam_response **resp, void *data) |
a5c9cd31 | 342 | { |
05114c74 | 343 | Buffer buffer; |
344 | struct pam_ctxt *ctxt; | |
0a23d79f | 345 | struct pam_response *reply; |
05114c74 | 346 | int i; |
347 | ||
60922169 | 348 | debug3("PAM: %s entering, %d messages", __func__, n); |
0a23d79f | 349 | *resp = NULL; |
350 | ||
d506e25f | 351 | if (data == NULL) { |
352 | error("PAM: conversation function passed a null context"); | |
353 | return (PAM_CONV_ERR); | |
354 | } | |
05114c74 | 355 | ctxt = data; |
356 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
357 | return (PAM_CONV_ERR); | |
0a23d79f | 358 | |
01d35895 | 359 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 360 | return (PAM_CONV_ERR); |
0a23d79f | 361 | |
05114c74 | 362 | buffer_init(&buffer); |
363 | for (i = 0; i < n; ++i) { | |
05114c74 | 364 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
365 | case PAM_PROMPT_ECHO_OFF: | |
aff51935 | 366 | buffer_put_cstring(&buffer, |
0a23d79f | 367 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 368 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 369 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
370 | goto fail; | |
aff51935 | 371 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 372 | goto fail; |
05114c74 | 373 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
374 | goto fail; | |
0a23d79f | 375 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 376 | break; |
377 | case PAM_PROMPT_ECHO_ON: | |
aff51935 | 378 | buffer_put_cstring(&buffer, |
0a23d79f | 379 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 380 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 381 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
382 | goto fail; | |
383 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
384 | goto fail; | |
05114c74 | 385 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
386 | goto fail; | |
0a23d79f | 387 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 388 | break; |
389 | case PAM_ERROR_MSG: | |
aff51935 | 390 | buffer_put_cstring(&buffer, |
0a23d79f | 391 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 392 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 393 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
394 | goto fail; | |
05114c74 | 395 | break; |
396 | case PAM_TEXT_INFO: | |
aff51935 | 397 | buffer_put_cstring(&buffer, |
0a23d79f | 398 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 399 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 400 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
401 | goto fail; | |
05114c74 | 402 | break; |
403 | default: | |
404 | goto fail; | |
a5c9cd31 | 405 | } |
05114c74 | 406 | buffer_clear(&buffer); |
a5c9cd31 | 407 | } |
05114c74 | 408 | buffer_free(&buffer); |
0a23d79f | 409 | *resp = reply; |
05114c74 | 410 | return (PAM_SUCCESS); |
0a23d79f | 411 | |
05114c74 | 412 | fail: |
0a23d79f | 413 | for(i = 0; i < n; i++) { |
414 | if (reply[i].resp != NULL) | |
415 | xfree(reply[i].resp); | |
416 | } | |
417 | xfree(reply); | |
05114c74 | 418 | buffer_free(&buffer); |
419 | return (PAM_CONV_ERR); | |
420 | } | |
a5c9cd31 | 421 | |
05114c74 | 422 | /* |
423 | * Authentication thread. | |
424 | */ | |
425 | static void * | |
426 | sshpam_thread(void *ctxtp) | |
427 | { | |
428 | struct pam_ctxt *ctxt = ctxtp; | |
429 | Buffer buffer; | |
c53917a9 | 430 | struct pam_conv sshpam_conv; |
e4472e7e | 431 | int flags = (options.permit_empty_passwd == 0 ? |
432 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
b4143b2a | 433 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
2212fc98 | 434 | extern char **environ; |
435 | char **env_from_pam; | |
436 | u_int i; | |
05114c74 | 437 | const char *pam_user; |
44171182 | 438 | const char **ptr_pam_user = &pam_user; |
05114c74 | 439 | |
44171182 | 440 | pam_get_item(sshpam_handle, PAM_USER, |
441 | (sshpam_const void **)ptr_pam_user); | |
2212fc98 | 442 | environ[0] = NULL; |
da97d54d | 443 | |
444 | if (sshpam_authctxt != NULL) { | |
445 | setproctitle("%s [pam]", | |
446 | sshpam_authctxt->valid ? pam_user : "unknown"); | |
447 | } | |
05114c74 | 448 | #endif |
a5c9cd31 | 449 | |
c53917a9 | 450 | sshpam_conv.conv = sshpam_thread_conv; |
451 | sshpam_conv.appdata_ptr = ctxt; | |
452 | ||
d948154a | 453 | if (sshpam_authctxt == NULL) |
529d73ab | 454 | fatal("%s: PAM authctxt not initialized", __func__); |
455 | ||
05114c74 | 456 | buffer_init(&buffer); |
457 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
458 | (const void *)&sshpam_conv); | |
459 | if (sshpam_err != PAM_SUCCESS) | |
460 | goto auth_fail; | |
e4472e7e | 461 | sshpam_err = pam_authenticate(sshpam_handle, flags); |
05114c74 | 462 | if (sshpam_err != PAM_SUCCESS) |
463 | goto auth_fail; | |
b3ef7fb7 | 464 | |
2935db92 | 465 | if (compat20) { |
5aa56df0 | 466 | if (!do_pam_account()) { |
467 | sshpam_err = PAM_ACCT_EXPIRED; | |
b3ef7fb7 | 468 | goto auth_fail; |
5aa56df0 | 469 | } |
d948154a | 470 | if (sshpam_authctxt->force_pwchange) { |
b3ef7fb7 | 471 | sshpam_err = pam_chauthtok(sshpam_handle, |
472 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
473 | if (sshpam_err != PAM_SUCCESS) | |
474 | goto auth_fail; | |
c10bb2ce | 475 | sshpam_password_change_required(0); |
b3ef7fb7 | 476 | } |
2935db92 | 477 | } |
b3ef7fb7 | 478 | |
05114c74 | 479 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 480 | |
b4143b2a | 481 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 482 | /* Export variables set by do_pam_account */ |
483 | buffer_put_int(&buffer, sshpam_account_status); | |
d948154a | 484 | buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); |
b3ef7fb7 | 485 | |
2212fc98 | 486 | /* Export any environment strings set in child */ |
487 | for(i = 0; environ[i] != NULL; i++) | |
488 | ; /* Count */ | |
489 | buffer_put_int(&buffer, i); | |
490 | for(i = 0; environ[i] != NULL; i++) | |
491 | buffer_put_cstring(&buffer, environ[i]); | |
492 | ||
493 | /* Export any environment strings set by PAM in child */ | |
494 | env_from_pam = pam_getenvlist(sshpam_handle); | |
495 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
496 | ; /* Count */ | |
497 | buffer_put_int(&buffer, i); | |
498 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
499 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
b4143b2a | 500 | #endif /* UNSUPPORTED_POSIX_THREADS_HACK */ |
2212fc98 | 501 | |
7b2a0de3 | 502 | /* XXX - can't do much about an error here */ |
05114c74 | 503 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
504 | buffer_free(&buffer); | |
505 | pthread_exit(NULL); | |
506 | ||
507 | auth_fail: | |
508 | buffer_put_cstring(&buffer, | |
509 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 510 | /* XXX - can't do much about an error here */ |
5aa56df0 | 511 | if (sshpam_err == PAM_ACCT_EXPIRED) |
512 | ssh_msg_send(ctxt->pam_csock, PAM_ACCT_EXPIRED, &buffer); | |
513 | else | |
514 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); | |
05114c74 | 515 | buffer_free(&buffer); |
516 | pthread_exit(NULL); | |
b6453d99 | 517 | |
05114c74 | 518 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 519 | } |
520 | ||
c6630044 | 521 | void |
522 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 523 | { |
c6630044 | 524 | struct pam_ctxt *ctxt = cleanup_ctxt; |
525 | ||
90f3c272 | 526 | debug3("PAM: %s entering", __func__); |
c6630044 | 527 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
528 | pthread_cancel(ctxt->pam_thread); | |
529 | pthread_join(ctxt->pam_thread, NULL); | |
530 | close(ctxt->pam_psock); | |
531 | close(ctxt->pam_csock); | |
532 | memset(ctxt, 0, sizeof(*ctxt)); | |
533 | cleanup_ctxt = NULL; | |
534 | } | |
05114c74 | 535 | } |
a5c9cd31 | 536 | |
05114c74 | 537 | static int |
44171182 | 538 | sshpam_null_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 539 | struct pam_response **resp, void *data) |
05114c74 | 540 | { |
60922169 | 541 | debug3("PAM: %s entering, %d messages", __func__, n); |
05114c74 | 542 | return (PAM_CONV_ERR); |
543 | } | |
a5c9cd31 | 544 | |
05114c74 | 545 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
546 | ||
ab17aac2 | 547 | static int |
44171182 | 548 | sshpam_store_conv(int n, sshpam_const struct pam_message **msg, |
ab17aac2 | 549 | struct pam_response **resp, void *data) |
550 | { | |
551 | struct pam_response *reply; | |
552 | int i; | |
553 | size_t len; | |
554 | ||
555 | debug3("PAM: %s called with %d messages", __func__, n); | |
556 | *resp = NULL; | |
557 | ||
558 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
559 | return (PAM_CONV_ERR); | |
560 | ||
01d35895 | 561 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
ab17aac2 | 562 | return (PAM_CONV_ERR); |
ab17aac2 | 563 | |
564 | for (i = 0; i < n; ++i) { | |
565 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
566 | case PAM_ERROR_MSG: | |
567 | case PAM_TEXT_INFO: | |
568 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
569 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); | |
570 | buffer_append(&loginmsg, "\n", 1 ); | |
571 | reply[i].resp_retcode = PAM_SUCCESS; | |
572 | break; | |
573 | default: | |
574 | goto fail; | |
575 | } | |
576 | } | |
577 | *resp = reply; | |
578 | return (PAM_SUCCESS); | |
579 | ||
580 | fail: | |
581 | for(i = 0; i < n; i++) { | |
582 | if (reply[i].resp != NULL) | |
583 | xfree(reply[i].resp); | |
584 | } | |
585 | xfree(reply); | |
586 | return (PAM_CONV_ERR); | |
587 | } | |
588 | ||
589 | static struct pam_conv store_conv = { sshpam_store_conv, NULL }; | |
590 | ||
c6630044 | 591 | void |
592 | sshpam_cleanup(void) | |
05114c74 | 593 | { |
05114c74 | 594 | debug("PAM: cleanup"); |
0a23d79f | 595 | if (sshpam_handle == NULL) |
596 | return; | |
05114c74 | 597 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
598 | if (sshpam_cred_established) { | |
599 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
600 | sshpam_cred_established = 0; | |
601 | } | |
602 | if (sshpam_session_open) { | |
603 | pam_close_session(sshpam_handle, PAM_SILENT); | |
604 | sshpam_session_open = 0; | |
a5c9cd31 | 605 | } |
dd1fb864 | 606 | sshpam_authenticated = 0; |
05114c74 | 607 | pam_end(sshpam_handle, sshpam_err); |
608 | sshpam_handle = NULL; | |
a5c9cd31 | 609 | } |
610 | ||
05114c74 | 611 | static int |
529d73ab | 612 | sshpam_init(Authctxt *authctxt) |
a5c9cd31 | 613 | { |
74678fb9 | 614 | extern char *__progname; |
529d73ab | 615 | const char *pam_rhost, *pam_user, *user = authctxt->user; |
44171182 | 616 | const char **ptr_pam_user = &pam_user; |
05114c74 | 617 | |
618 | if (sshpam_handle != NULL) { | |
619 | /* We already have a PAM context; check if the user matches */ | |
620 | sshpam_err = pam_get_item(sshpam_handle, | |
44171182 | 621 | PAM_USER, (sshpam_const void **)ptr_pam_user); |
05114c74 | 622 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) |
623 | return (0); | |
05114c74 | 624 | pam_end(sshpam_handle, sshpam_err); |
625 | sshpam_handle = NULL; | |
626 | } | |
627 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 628 | sshpam_err = |
ba6dd90e | 629 | pam_start(SSHD_PAM_SERVICE, user, &store_conv, &sshpam_handle); |
d948154a | 630 | sshpam_authctxt = authctxt; |
529d73ab | 631 | |
5ff453c0 | 632 | if (sshpam_err != PAM_SUCCESS) { |
633 | pam_end(sshpam_handle, sshpam_err); | |
634 | sshpam_handle = NULL; | |
05114c74 | 635 | return (-1); |
5ff453c0 | 636 | } |
c5a7d788 | 637 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 638 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 639 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 640 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 641 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 642 | sshpam_handle = NULL; |
643 | return (-1); | |
644 | } | |
645 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 646 | /* |
647 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
648 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 649 | * may not even set one (for tty-less connections) |
aff51935 | 650 | */ |
5ff453c0 | 651 | debug("PAM: setting PAM_TTY to \"ssh\""); |
652 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 653 | if (sshpam_err != PAM_SUCCESS) { |
654 | pam_end(sshpam_handle, sshpam_err); | |
655 | sshpam_handle = NULL; | |
656 | return (-1); | |
a5c9cd31 | 657 | } |
5ff453c0 | 658 | #endif |
05114c74 | 659 | return (0); |
a5c9cd31 | 660 | } |
661 | ||
05114c74 | 662 | static void * |
663 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 664 | { |
05114c74 | 665 | struct pam_ctxt *ctxt; |
666 | int socks[2]; | |
2b87da3b | 667 | |
90f3c272 | 668 | debug3("PAM: %s entering", __func__); |
5aa56df0 | 669 | /* |
670 | * Refuse to start if we don't have PAM enabled or do_pam_account | |
671 | * has previously failed. | |
672 | */ | |
673 | if (!options.use_pam || sshpam_account_status == 0) | |
7fceb20d | 674 | return NULL; |
675 | ||
05114c74 | 676 | /* Initialize PAM */ |
529d73ab | 677 | if (sshpam_init(authctxt) == -1) { |
05114c74 | 678 | error("PAM: initialization failed"); |
679 | return (NULL); | |
680 | } | |
5c377b3b | 681 | |
05114c74 | 682 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 683 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 684 | |
685 | /* Start the authentication thread */ | |
686 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
687 | error("PAM: failed create sockets: %s", strerror(errno)); | |
688 | xfree(ctxt); | |
689 | return (NULL); | |
690 | } | |
691 | ctxt->pam_psock = socks[0]; | |
692 | ctxt->pam_csock = socks[1]; | |
693 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
694 | error("PAM: failed to start authentication thread: %s", | |
695 | strerror(errno)); | |
696 | close(socks[0]); | |
697 | close(socks[1]); | |
698 | xfree(ctxt); | |
699 | return (NULL); | |
a5c9cd31 | 700 | } |
c6630044 | 701 | cleanup_ctxt = ctxt; |
05114c74 | 702 | return (ctxt); |
703 | } | |
a5c9cd31 | 704 | |
05114c74 | 705 | static int |
706 | sshpam_query(void *ctx, char **name, char **info, | |
707 | u_int *num, char ***prompts, u_int **echo_on) | |
708 | { | |
709 | Buffer buffer; | |
710 | struct pam_ctxt *ctxt = ctx; | |
711 | size_t plen; | |
712 | u_char type; | |
713 | char *msg; | |
bbe58934 | 714 | size_t len, mlen; |
05114c74 | 715 | |
90f3c272 | 716 | debug3("PAM: %s entering", __func__); |
05114c74 | 717 | buffer_init(&buffer); |
718 | *name = xstrdup(""); | |
719 | *info = xstrdup(""); | |
720 | *prompts = xmalloc(sizeof(char *)); | |
721 | **prompts = NULL; | |
722 | plen = 0; | |
723 | *echo_on = xmalloc(sizeof(u_int)); | |
724 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
725 | type = buffer_get_char(&buffer); | |
726 | msg = buffer_get_string(&buffer, NULL); | |
bbe58934 | 727 | mlen = strlen(msg); |
05114c74 | 728 | switch (type) { |
729 | case PAM_PROMPT_ECHO_ON: | |
730 | case PAM_PROMPT_ECHO_OFF: | |
731 | *num = 1; | |
bbe58934 | 732 | len = plen + mlen + 1; |
c5d10563 | 733 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 734 | strlcpy(**prompts + plen, msg, len - plen); |
735 | plen += mlen; | |
05114c74 | 736 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
737 | xfree(msg); | |
738 | return (0); | |
739 | case PAM_ERROR_MSG: | |
740 | case PAM_TEXT_INFO: | |
741 | /* accumulate messages */ | |
bbe58934 | 742 | len = plen + mlen + 2; |
c5d10563 | 743 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 744 | strlcpy(**prompts + plen, msg, len - plen); |
745 | plen += mlen; | |
746 | strlcat(**prompts + plen, "\n", len - plen); | |
747 | plen++; | |
05114c74 | 748 | xfree(msg); |
5daf7064 | 749 | break; |
5aa56df0 | 750 | case PAM_ACCT_EXPIRED: |
751 | sshpam_account_status = 0; | |
752 | /* FALLTHROUGH */ | |
05114c74 | 753 | case PAM_AUTH_ERR: |
5aa56df0 | 754 | debug3("PAM: %s", pam_strerror(sshpam_handle, type)); |
cafa6a80 | 755 | if (**prompts != NULL && strlen(**prompts) != 0) { |
756 | *info = **prompts; | |
757 | **prompts = NULL; | |
758 | *num = 0; | |
759 | **echo_on = 0; | |
760 | ctxt->pam_done = -1; | |
08a3f952 | 761 | xfree(msg); |
cafa6a80 | 762 | return 0; |
763 | } | |
764 | /* FALLTHROUGH */ | |
765 | case PAM_SUCCESS: | |
05114c74 | 766 | if (**prompts != NULL) { |
767 | /* drain any accumulated messages */ | |
3eaf3960 | 768 | debug("PAM: %s", **prompts); |
769 | buffer_append(&loginmsg, **prompts, | |
770 | strlen(**prompts)); | |
05114c74 | 771 | xfree(**prompts); |
772 | **prompts = NULL; | |
773 | } | |
774 | if (type == PAM_SUCCESS) { | |
2d5104e2 | 775 | if (!sshpam_authctxt->valid || |
776 | (sshpam_authctxt->pw->pw_uid == 0 && | |
777 | options.permit_root_login != PERMIT_YES)) | |
af0e5c2f | 778 | fatal("Internal error: PAM auth " |
779 | "succeeded when it should have " | |
780 | "failed"); | |
2212fc98 | 781 | import_environments(&buffer); |
05114c74 | 782 | *num = 0; |
783 | **echo_on = 0; | |
784 | ctxt->pam_done = 1; | |
785 | xfree(msg); | |
786 | return (0); | |
787 | } | |
1e08e787 | 788 | error("PAM: %s for %s%.100s from %.100s", msg, |
789 | sshpam_authctxt->valid ? "" : "illegal user ", | |
790 | sshpam_authctxt->user, | |
791 | get_remote_name_or_ip(utmp_len, options.use_dns)); | |
e250770b | 792 | /* FALLTHROUGH */ |
5daf7064 | 793 | default: |
05114c74 | 794 | *num = 0; |
795 | **echo_on = 0; | |
796 | xfree(msg); | |
797 | ctxt->pam_done = -1; | |
798 | return (-1); | |
799 | } | |
a5c9cd31 | 800 | } |
05114c74 | 801 | return (-1); |
a5c9cd31 | 802 | } |
803 | ||
05114c74 | 804 | /* XXX - see also comment in auth-chall.c:verify_response */ |
805 | static int | |
806 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 807 | { |
05114c74 | 808 | Buffer buffer; |
809 | struct pam_ctxt *ctxt = ctx; | |
810 | ||
912acf53 | 811 | debug2("PAM: %s entering, %u responses", __func__, num); |
05114c74 | 812 | switch (ctxt->pam_done) { |
813 | case 1: | |
814 | sshpam_authenticated = 1; | |
815 | return (0); | |
816 | case 0: | |
817 | break; | |
818 | default: | |
819 | return (-1); | |
a5c9cd31 | 820 | } |
05114c74 | 821 | if (num != 1) { |
822 | error("PAM: expected one response, got %u", num); | |
823 | return (-1); | |
824 | } | |
825 | buffer_init(&buffer); | |
2d5104e2 | 826 | if (sshpam_authctxt->valid && |
827 | (sshpam_authctxt->pw->pw_uid != 0 || | |
ed9e8be3 | 828 | options.permit_root_login == PERMIT_YES)) |
af0e5c2f | 829 | buffer_put_cstring(&buffer, *resp); |
830 | else | |
831 | buffer_put_cstring(&buffer, badpw); | |
7b2a0de3 | 832 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
833 | buffer_free(&buffer); | |
834 | return (-1); | |
835 | } | |
05114c74 | 836 | buffer_free(&buffer); |
837 | return (1); | |
a5c9cd31 | 838 | } |
839 | ||
05114c74 | 840 | static void |
841 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 842 | { |
05114c74 | 843 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 844 | |
90f3c272 | 845 | debug3("PAM: %s entering", __func__); |
c6630044 | 846 | sshpam_thread_cleanup(); |
05114c74 | 847 | xfree(ctxt); |
848 | /* | |
849 | * We don't call sshpam_cleanup() here because we may need the PAM | |
850 | * handle at a later stage, e.g. when setting up a session. It's | |
851 | * still on the cleanup list, so pam_end() *will* be called before | |
852 | * the server process terminates. | |
853 | */ | |
ad55cd03 | 854 | } |
855 | ||
05114c74 | 856 | KbdintDevice sshpam_device = { |
857 | "pam", | |
858 | sshpam_init_ctx, | |
859 | sshpam_query, | |
860 | sshpam_respond, | |
861 | sshpam_free_ctx | |
862 | }; | |
863 | ||
864 | KbdintDevice mm_sshpam_device = { | |
865 | "pam", | |
866 | mm_sshpam_init_ctx, | |
867 | mm_sshpam_query, | |
868 | mm_sshpam_respond, | |
869 | mm_sshpam_free_ctx | |
870 | }; | |
2919e060 | 871 | |
2b87da3b | 872 | /* |
05114c74 | 873 | * This replaces auth-pam.c |
ad55cd03 | 874 | */ |
05114c74 | 875 | void |
529d73ab | 876 | start_pam(Authctxt *authctxt) |
ad55cd03 | 877 | { |
817e6d38 | 878 | if (!options.use_pam) |
879 | fatal("PAM: initialisation requested when UsePAM=no"); | |
880 | ||
529d73ab | 881 | if (sshpam_init(authctxt) == -1) |
05114c74 | 882 | fatal("PAM: initialisation failed"); |
a5c9cd31 | 883 | } |
884 | ||
05114c74 | 885 | void |
886 | finish_pam(void) | |
a5c9cd31 | 887 | { |
c6630044 | 888 | sshpam_cleanup(); |
a5c9cd31 | 889 | } |
890 | ||
5b9e2464 | 891 | u_int |
892 | do_pam_account(void) | |
a5c9cd31 | 893 | { |
ba6dd90e | 894 | debug("%s: called", __func__); |
b3ef7fb7 | 895 | if (sshpam_account_status != -1) |
896 | return (sshpam_account_status); | |
897 | ||
5b9e2464 | 898 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
ba6dd90e | 899 | debug3("PAM: %s pam_acct_mgmt = %d (%s)", __func__, sshpam_err, |
900 | pam_strerror(sshpam_handle, sshpam_err)); | |
d1cf9a87 | 901 | |
b3ef7fb7 | 902 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { |
903 | sshpam_account_status = 0; | |
904 | return (sshpam_account_status); | |
5b9e2464 | 905 | } |
906 | ||
b3ef7fb7 | 907 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
c10bb2ce | 908 | sshpam_password_change_required(1); |
b3ef7fb7 | 909 | |
910 | sshpam_account_status = 1; | |
911 | return (sshpam_account_status); | |
05114c74 | 912 | } |
46c76c63 | 913 | |
49e82bb9 | 914 | void |
915 | do_pam_set_tty(const char *tty) | |
916 | { | |
26b3608b | 917 | if (tty != NULL) { |
918 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
919 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
920 | if (sshpam_err != PAM_SUCCESS) | |
921 | fatal("PAM: failed to set PAM_TTY: %s", | |
922 | pam_strerror(sshpam_handle, sshpam_err)); | |
923 | } | |
05114c74 | 924 | } |
cbd7492e | 925 | |
05114c74 | 926 | void |
927 | do_pam_setcred(int init) | |
928 | { | |
929 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
ba6dd90e | 930 | (const void *)&store_conv); |
05114c74 | 931 | if (sshpam_err != PAM_SUCCESS) |
932 | fatal("PAM: failed to set PAM_CONV: %s", | |
933 | pam_strerror(sshpam_handle, sshpam_err)); | |
934 | if (init) { | |
935 | debug("PAM: establishing credentials"); | |
936 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
937 | } else { | |
938 | debug("PAM: reinitializing credentials"); | |
939 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
940 | } | |
941 | if (sshpam_err == PAM_SUCCESS) { | |
942 | sshpam_cred_established = 1; | |
943 | return; | |
944 | } | |
945 | if (sshpam_authenticated) | |
946 | fatal("PAM: pam_setcred(): %s", | |
947 | pam_strerror(sshpam_handle, sshpam_err)); | |
948 | else | |
949 | debug("PAM: pam_setcred(): %s", | |
950 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 951 | } |
952 | ||
05114c74 | 953 | static int |
44171182 | 954 | sshpam_tty_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 955 | struct pam_response **resp, void *data) |
ee48c949 | 956 | { |
05114c74 | 957 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 958 | struct pam_response *reply; |
ee48c949 | 959 | int i; |
960 | ||
60922169 | 961 | debug3("PAM: %s called with %d messages", __func__, n); |
962 | ||
0a23d79f | 963 | *resp = NULL; |
964 | ||
3eaf3960 | 965 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 966 | return (PAM_CONV_ERR); |
0a23d79f | 967 | |
01d35895 | 968 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 969 | return (PAM_CONV_ERR); |
0a23d79f | 970 | |
05114c74 | 971 | for (i = 0; i < n; ++i) { |
972 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
973 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 974 | reply[i].resp = |
aff51935 | 975 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 976 | RP_ALLOW_STDIN); |
0a23d79f | 977 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 978 | break; |
979 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 980 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 981 | fgets(input, sizeof input, stdin); |
8936b151 | 982 | if ((reply[i].resp = strdup(input)) == NULL) |
983 | goto fail; | |
0a23d79f | 984 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 985 | break; |
986 | case PAM_ERROR_MSG: | |
987 | case PAM_TEXT_INFO: | |
74117b26 | 988 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 989 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 990 | break; |
991 | default: | |
992 | goto fail; | |
993 | } | |
ee48c949 | 994 | } |
0a23d79f | 995 | *resp = reply; |
05114c74 | 996 | return (PAM_SUCCESS); |
0a23d79f | 997 | |
05114c74 | 998 | fail: |
0a23d79f | 999 | for(i = 0; i < n; i++) { |
1000 | if (reply[i].resp != NULL) | |
1001 | xfree(reply[i].resp); | |
1002 | } | |
1003 | xfree(reply); | |
05114c74 | 1004 | return (PAM_CONV_ERR); |
ee48c949 | 1005 | } |
1006 | ||
8600a4ab | 1007 | static struct pam_conv tty_conv = { sshpam_tty_conv, NULL }; |
3eaf3960 | 1008 | |
05114c74 | 1009 | /* |
1010 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
1011 | * support that | |
1012 | */ | |
1013 | void | |
1014 | do_pam_chauthtok(void) | |
a5c9cd31 | 1015 | { |
05114c74 | 1016 | if (use_privsep) |
5b9e2464 | 1017 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 1018 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 1019 | (const void *)&tty_conv); |
05114c74 | 1020 | if (sshpam_err != PAM_SUCCESS) |
1021 | fatal("PAM: failed to set PAM_CONV: %s", | |
1022 | pam_strerror(sshpam_handle, sshpam_err)); | |
1023 | debug("PAM: changing password"); | |
1024 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
1025 | if (sshpam_err != PAM_SUCCESS) | |
1026 | fatal("PAM: pam_chauthtok(): %s", | |
1027 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 1028 | } |
1029 | ||
3eaf3960 | 1030 | void |
1031 | do_pam_session(void) | |
1032 | { | |
dd1fb864 | 1033 | debug3("PAM: opening session"); |
aff51935 | 1034 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
ef687c66 | 1035 | (const void *)&store_conv); |
3eaf3960 | 1036 | if (sshpam_err != PAM_SUCCESS) |
1037 | fatal("PAM: failed to set PAM_CONV: %s", | |
1038 | pam_strerror(sshpam_handle, sshpam_err)); | |
1039 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
abdec250 | 1040 | if (sshpam_err == PAM_SUCCESS) |
1041 | sshpam_session_open = 1; | |
1042 | else { | |
1043 | sshpam_session_open = 0; | |
1044 | disable_forwarding(); | |
1045 | error("PAM: pam_open_session(): %s", | |
3eaf3960 | 1046 | pam_strerror(sshpam_handle, sshpam_err)); |
abdec250 | 1047 | } |
1048 | ||
1049 | } | |
1050 | ||
1051 | int | |
1052 | is_pam_session_open(void) | |
1053 | { | |
1054 | return sshpam_session_open; | |
3eaf3960 | 1055 | } |
1056 | ||
aff51935 | 1057 | /* |
749560dd | 1058 | * Set a PAM environment string. We need to do this so that the session |
1059 | * modules can handle things like Kerberos/GSI credentials that appear | |
1060 | * during the ssh authentication process. | |
1061 | */ | |
749560dd | 1062 | int |
aff51935 | 1063 | do_pam_putenv(char *name, char *value) |
749560dd | 1064 | { |
749560dd | 1065 | int ret = 1; |
b6453d99 | 1066 | #ifdef HAVE_PAM_PUTENV |
263c65df | 1067 | char *compound; |
1068 | size_t len; | |
1069 | ||
1070 | len = strlen(name) + strlen(value) + 2; | |
1071 | compound = xmalloc(len); | |
1072 | ||
1073 | snprintf(compound, len, "%s=%s", name, value); | |
1074 | ret = pam_putenv(sshpam_handle, compound); | |
1075 | xfree(compound); | |
749560dd | 1076 | #endif |
263c65df | 1077 | |
749560dd | 1078 | return (ret); |
1079 | } | |
1080 | ||
2212fc98 | 1081 | char ** |
1082 | fetch_pam_child_environment(void) | |
1083 | { | |
1084 | return sshpam_env; | |
1085 | } | |
1086 | ||
05114c74 | 1087 | char ** |
1088 | fetch_pam_environment(void) | |
1089 | { | |
05114c74 | 1090 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 1091 | } |
5c377b3b | 1092 | |
05114c74 | 1093 | void |
1094 | free_pam_environment(char **env) | |
1095 | { | |
1096 | char **envp; | |
5daf7064 | 1097 | |
0eb6370a | 1098 | if (env == NULL) |
1099 | return; | |
1100 | ||
05114c74 | 1101 | for (envp = env; *envp; envp++) |
1102 | xfree(*envp); | |
1103 | xfree(env); | |
a5c9cd31 | 1104 | } |
1105 | ||
5de92f17 | 1106 | /* |
1107 | * "Blind" conversation function for password authentication. Assumes that | |
1108 | * echo-off prompts are for the password and stores messages for later | |
1109 | * display. | |
1110 | */ | |
1111 | static int | |
44171182 | 1112 | sshpam_passwd_conv(int n, sshpam_const struct pam_message **msg, |
5de92f17 | 1113 | struct pam_response **resp, void *data) |
1114 | { | |
1115 | struct pam_response *reply; | |
1116 | int i; | |
1117 | size_t len; | |
1118 | ||
1119 | debug3("PAM: %s called with %d messages", __func__, n); | |
1120 | ||
1121 | *resp = NULL; | |
1122 | ||
1123 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
1124 | return (PAM_CONV_ERR); | |
1125 | ||
1126 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
1127 | return (PAM_CONV_ERR); | |
1128 | memset(reply, 0, n * sizeof(*reply)); | |
1129 | ||
1130 | for (i = 0; i < n; ++i) { | |
1131 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
1132 | case PAM_PROMPT_ECHO_OFF: | |
1133 | if (sshpam_password == NULL) | |
1134 | goto fail; | |
8936b151 | 1135 | if ((reply[i].resp = strdup(sshpam_password)) == NULL) |
1136 | goto fail; | |
5de92f17 | 1137 | reply[i].resp_retcode = PAM_SUCCESS; |
1138 | break; | |
1139 | case PAM_ERROR_MSG: | |
1140 | case PAM_TEXT_INFO: | |
1141 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
1142 | if (len > 0) { | |
1143 | buffer_append(&loginmsg, | |
1144 | PAM_MSG_MEMBER(msg, i, msg), len); | |
1145 | buffer_append(&loginmsg, "\n", 1); | |
1146 | } | |
8936b151 | 1147 | if ((reply[i].resp = strdup("")) == NULL) |
1148 | goto fail; | |
5de92f17 | 1149 | reply[i].resp_retcode = PAM_SUCCESS; |
1150 | break; | |
1151 | default: | |
1152 | goto fail; | |
1153 | } | |
1154 | } | |
1155 | *resp = reply; | |
1156 | return (PAM_SUCCESS); | |
1157 | ||
d1cf9a87 | 1158 | fail: |
5de92f17 | 1159 | for(i = 0; i < n; i++) { |
1160 | if (reply[i].resp != NULL) | |
1161 | xfree(reply[i].resp); | |
1162 | } | |
1163 | xfree(reply); | |
1164 | return (PAM_CONV_ERR); | |
1165 | } | |
1166 | ||
1167 | static struct pam_conv passwd_conv = { sshpam_passwd_conv, NULL }; | |
1168 | ||
1169 | /* | |
1170 | * Attempt password authentication via PAM | |
1171 | */ | |
1172 | int | |
1173 | sshpam_auth_passwd(Authctxt *authctxt, const char *password) | |
1174 | { | |
1175 | int flags = (options.permit_empty_passwd == 0 ? | |
1176 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
1177 | ||
1178 | if (!options.use_pam || sshpam_handle == NULL) | |
1179 | fatal("PAM: %s called when PAM disabled or failed to " | |
1180 | "initialise.", __func__); | |
1181 | ||
1182 | sshpam_password = password; | |
1183 | sshpam_authctxt = authctxt; | |
1184 | ||
0e716148 | 1185 | /* |
1186 | * If the user logging in is invalid, or is root but is not permitted | |
1187 | * by PermitRootLogin, use an invalid password to prevent leaking | |
1188 | * information via timing (eg if the PAM config has a delay on fail). | |
1189 | */ | |
2d5104e2 | 1190 | if (!authctxt->valid || (authctxt->pw->pw_uid == 0 && |
ed9e8be3 | 1191 | options.permit_root_login != PERMIT_YES)) |
0e716148 | 1192 | sshpam_password = badpw; |
1193 | ||
5de92f17 | 1194 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
1195 | (const void *)&passwd_conv); | |
1196 | if (sshpam_err != PAM_SUCCESS) | |
1197 | fatal("PAM: %s: failed to set PAM_CONV: %s", __func__, | |
1198 | pam_strerror(sshpam_handle, sshpam_err)); | |
1199 | ||
1200 | sshpam_err = pam_authenticate(sshpam_handle, flags); | |
1201 | sshpam_password = NULL; | |
2d5104e2 | 1202 | if (sshpam_err == PAM_SUCCESS && authctxt->valid) { |
5de92f17 | 1203 | debug("PAM: password authentication accepted for %.100s", |
1204 | authctxt->user); | |
ed9e8be3 | 1205 | return 1; |
5de92f17 | 1206 | } else { |
1207 | debug("PAM: password authentication failed for %.100s: %s", | |
1208 | authctxt->valid ? authctxt->user : "an illegal user", | |
1209 | pam_strerror(sshpam_handle, sshpam_err)); | |
1210 | return 0; | |
1211 | } | |
1212 | } | |
a5c9cd31 | 1213 | #endif /* USE_PAM */ |