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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 | ||
fde58bd4 | 81 | #include "auth.h" |
5c377b3b | 82 | #include "auth-pam.h" |
05114c74 | 83 | #include "buffer.h" |
84 | #include "bufaux.h" | |
42f11eb2 | 85 | #include "canohost.h" |
05114c74 | 86 | #include "log.h" |
87 | #include "monitor_wrap.h" | |
88 | #include "msg.h" | |
89 | #include "packet.h" | |
0f3ee929 | 90 | #include "misc.h" |
05114c74 | 91 | #include "servconf.h" |
92 | #include "ssh2.h" | |
93 | #include "xmalloc.h" | |
5b9e2464 | 94 | #include "auth-options.h" |
a5c9cd31 | 95 | |
7fceb20d | 96 | extern ServerOptions options; |
3eaf3960 | 97 | extern Buffer loginmsg; |
b3ef7fb7 | 98 | extern int compat20; |
1e08e787 | 99 | extern u_int utmp_len; |
7fceb20d | 100 | |
b4143b2a | 101 | /* so we don't silently change behaviour */ |
05114c74 | 102 | #ifdef USE_POSIX_THREADS |
b4143b2a | 103 | # error "USE_POSIX_THREADS replaced by UNSUPPORTED_POSIX_THREADS_HACK" |
104 | #endif | |
105 | ||
106 | /* | |
107 | * Formerly known as USE_POSIX_THREADS, using this is completely unsupported | |
108 | * and generally a bad idea. Use at own risk and do not expect support if | |
109 | * this breaks. | |
110 | */ | |
111 | #ifdef UNSUPPORTED_POSIX_THREADS_HACK | |
05114c74 | 112 | #include <pthread.h> |
113 | /* | |
aff51935 | 114 | * Avoid namespace clash when *not* using pthreads for systems *with* |
115 | * pthreads, which unconditionally define pthread_t via sys/types.h | |
05114c74 | 116 | * (e.g. Linux) |
117 | */ | |
aff51935 | 118 | typedef pthread_t sp_pthread_t; |
05114c74 | 119 | #else |
e47e681f | 120 | typedef pid_t sp_pthread_t; |
121 | #endif | |
122 | ||
123 | struct pam_ctxt { | |
124 | sp_pthread_t pam_thread; | |
125 | int pam_psock; | |
126 | int pam_csock; | |
127 | int pam_done; | |
128 | }; | |
129 | ||
130 | static void sshpam_free_ctx(void *); | |
131 | static struct pam_ctxt *cleanup_ctxt; | |
132 | ||
b4143b2a | 133 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
05114c74 | 134 | /* |
135 | * Simulate threads with processes. | |
136 | */ | |
a5c9cd31 | 137 | |
100e6910 | 138 | static int sshpam_thread_status = -1; |
139 | static mysig_t sshpam_oldsig; | |
140 | ||
d1cf9a87 | 141 | static void |
100e6910 | 142 | sshpam_sigchld_handler(int sig) |
143 | { | |
8a956cda | 144 | signal(SIGCHLD, SIG_DFL); |
28b49ff8 | 145 | if (cleanup_ctxt == NULL) |
146 | return; /* handler called after PAM cleanup, shouldn't happen */ | |
8a956cda | 147 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG) |
ed9e8be3 | 148 | <= 0) { |
8a956cda | 149 | /* PAM thread has not exitted, privsep slave must have */ |
150 | kill(cleanup_ctxt->pam_thread, SIGTERM); | |
151 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) | |
930d0441 | 152 | <= 0) |
8a956cda | 153 | return; /* could not wait */ |
154 | } | |
100e6910 | 155 | if (WIFSIGNALED(sshpam_thread_status) && |
156 | WTERMSIG(sshpam_thread_status) == SIGTERM) | |
157 | return; /* terminated by pthread_cancel */ | |
158 | if (!WIFEXITED(sshpam_thread_status)) | |
159 | fatal("PAM: authentication thread exited unexpectedly"); | |
160 | if (WEXITSTATUS(sshpam_thread_status) != 0) | |
161 | fatal("PAM: authentication thread exited uncleanly"); | |
162 | } | |
163 | ||
28cb0a43 | 164 | /* ARGSUSED */ |
05114c74 | 165 | static void |
28cb0a43 | 166 | pthread_exit(void *value) |
05114c74 | 167 | { |
168 | _exit(0); | |
169 | } | |
5daf7064 | 170 | |
28cb0a43 | 171 | /* ARGSUSED */ |
05114c74 | 172 | static int |
28cb0a43 | 173 | pthread_create(sp_pthread_t *thread, const void *attr, |
05114c74 | 174 | void *(*thread_start)(void *), void *arg) |
175 | { | |
176 | pid_t pid; | |
5d001c70 | 177 | struct pam_ctxt *ctx = arg; |
05114c74 | 178 | |
355fbf31 | 179 | sshpam_thread_status = -1; |
05114c74 | 180 | switch ((pid = fork())) { |
181 | case -1: | |
182 | error("fork(): %s", strerror(errno)); | |
183 | return (-1); | |
184 | case 0: | |
5d001c70 | 185 | close(ctx->pam_psock); |
186 | ctx->pam_psock = -1; | |
05114c74 | 187 | thread_start(arg); |
188 | _exit(1); | |
189 | default: | |
190 | *thread = pid; | |
5d001c70 | 191 | close(ctx->pam_csock); |
192 | ctx->pam_csock = -1; | |
100e6910 | 193 | sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); |
05114c74 | 194 | return (0); |
195 | } | |
196 | } | |
a5c9cd31 | 197 | |
05114c74 | 198 | static int |
199 | pthread_cancel(sp_pthread_t thread) | |
8c9fe09e | 200 | { |
28b49ff8 | 201 | signal(SIGCHLD, sshpam_oldsig); |
05114c74 | 202 | return (kill(thread, SIGTERM)); |
8c9fe09e | 203 | } |
204 | ||
28cb0a43 | 205 | /* ARGSUSED */ |
05114c74 | 206 | static int |
28cb0a43 | 207 | pthread_join(sp_pthread_t thread, void **value) |
8c9fe09e | 208 | { |
05114c74 | 209 | int status; |
210 | ||
100e6910 | 211 | if (sshpam_thread_status != -1) |
212 | return (sshpam_thread_status); | |
213 | signal(SIGCHLD, sshpam_oldsig); | |
05114c74 | 214 | waitpid(thread, &status, 0); |
215 | return (status); | |
8c9fe09e | 216 | } |
05114c74 | 217 | #endif |
218 | ||
219 | ||
0a23d79f | 220 | static pam_handle_t *sshpam_handle = NULL; |
221 | static int sshpam_err = 0; | |
222 | static int sshpam_authenticated = 0; | |
0a23d79f | 223 | static int sshpam_session_open = 0; |
224 | static int sshpam_cred_established = 0; | |
b3ef7fb7 | 225 | static int sshpam_account_status = -1; |
2212fc98 | 226 | static char **sshpam_env = NULL; |
d948154a | 227 | static Authctxt *sshpam_authctxt = NULL; |
5de92f17 | 228 | static const char *sshpam_password = NULL; |
af0e5c2f | 229 | static char badpw[] = "\b\n\r\177INCORRECT"; |
05114c74 | 230 | |
2212fc98 | 231 | /* Some PAM implementations don't implement this */ |
232 | #ifndef HAVE_PAM_GETENVLIST | |
233 | static char ** | |
234 | pam_getenvlist(pam_handle_t *pamh) | |
235 | { | |
236 | /* | |
aff51935 | 237 | * XXX - If necessary, we can still support envrionment passing |
2212fc98 | 238 | * for platforms without pam_getenvlist by searching for known |
239 | * env vars (e.g. KRB5CCNAME) from the PAM environment. | |
240 | */ | |
241 | return NULL; | |
242 | } | |
243 | #endif | |
244 | ||
059d3165 | 245 | /* |
246 | * Some platforms, notably Solaris, do not enforce password complexity | |
247 | * rules during pam_chauthtok() if the real uid of the calling process | |
248 | * is 0, on the assumption that it's being called by "passwd" run by root. | |
249 | * This wraps pam_chauthtok and sets/restore the real uid so PAM will do | |
250 | * the right thing. | |
251 | */ | |
252 | #ifdef SSHPAM_CHAUTHTOK_NEEDS_RUID | |
253 | static int | |
254 | sshpam_chauthtok_ruid(pam_handle_t *pamh, int flags) | |
255 | { | |
256 | int result; | |
257 | ||
258 | if (sshpam_authctxt == NULL) | |
259 | fatal("PAM: sshpam_authctxt not initialized"); | |
260 | if (setreuid(sshpam_authctxt->pw->pw_uid, -1) == -1) | |
261 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
262 | result = pam_chauthtok(pamh, flags); | |
263 | if (setreuid(0, -1) == -1) | |
264 | fatal("%s: setreuid failed: %s", __func__, strerror(errno)); | |
265 | return result; | |
266 | } | |
267 | # define pam_chauthtok(a,b) (sshpam_chauthtok_ruid((a), (b))) | |
268 | #endif | |
269 | ||
b3ef7fb7 | 270 | void |
c10bb2ce | 271 | sshpam_password_change_required(int reqd) |
b3ef7fb7 | 272 | { |
90f3c272 | 273 | debug3("%s %d", __func__, reqd); |
d948154a | 274 | if (sshpam_authctxt == NULL) |
529d73ab | 275 | fatal("%s: PAM authctxt not initialized", __func__); |
d948154a | 276 | sshpam_authctxt->force_pwchange = reqd; |
b3ef7fb7 | 277 | if (reqd) { |
278 | no_port_forwarding_flag |= 2; | |
279 | no_agent_forwarding_flag |= 2; | |
280 | no_x11_forwarding_flag |= 2; | |
281 | } else { | |
282 | no_port_forwarding_flag &= ~2; | |
283 | no_agent_forwarding_flag &= ~2; | |
284 | no_x11_forwarding_flag &= ~2; | |
b3ef7fb7 | 285 | } |
286 | } | |
dd1fb864 | 287 | |
2212fc98 | 288 | /* Import regular and PAM environment from subprocess */ |
289 | static void | |
290 | import_environments(Buffer *b) | |
291 | { | |
292 | char *env; | |
293 | u_int i, num_env; | |
294 | int err; | |
295 | ||
90f3c272 | 296 | debug3("PAM: %s entering", __func__); |
297 | ||
b4143b2a | 298 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 299 | /* Import variables set by do_pam_account */ |
300 | sshpam_account_status = buffer_get_int(b); | |
c10bb2ce | 301 | sshpam_password_change_required(buffer_get_int(b)); |
b3ef7fb7 | 302 | |
2212fc98 | 303 | /* Import environment from subprocess */ |
304 | num_env = buffer_get_int(b); | |
01d35895 | 305 | if (num_env > 1024) |
306 | fatal("%s: received %u environment variables, expected <= 1024", | |
307 | __func__, num_env); | |
308 | sshpam_env = xcalloc(num_env + 1, sizeof(*sshpam_env)); | |
2212fc98 | 309 | debug3("PAM: num env strings %d", num_env); |
310 | for(i = 0; i < num_env; i++) | |
311 | sshpam_env[i] = buffer_get_string(b, NULL); | |
312 | ||
313 | sshpam_env[num_env] = NULL; | |
314 | ||
315 | /* Import PAM environment from subprocess */ | |
316 | num_env = buffer_get_int(b); | |
317 | debug("PAM: num PAM env strings %d", num_env); | |
318 | for(i = 0; i < num_env; i++) { | |
319 | env = buffer_get_string(b, NULL); | |
320 | ||
f79a6165 | 321 | #ifdef HAVE_PAM_PUTENV |
2212fc98 | 322 | /* Errors are not fatal here */ |
323 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { | |
324 | error("PAM: pam_putenv: %s", | |
325 | pam_strerror(sshpam_handle, sshpam_err)); | |
326 | } | |
f79a6165 | 327 | #endif |
2212fc98 | 328 | } |
a1e0095d | 329 | #endif |
2212fc98 | 330 | } |
331 | ||
ad55cd03 | 332 | /* |
05114c74 | 333 | * Conversation function for authentication thread. |
ad55cd03 | 334 | */ |
05114c74 | 335 | static int |
44171182 | 336 | sshpam_thread_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 337 | struct pam_response **resp, void *data) |
a5c9cd31 | 338 | { |
05114c74 | 339 | Buffer buffer; |
340 | struct pam_ctxt *ctxt; | |
0a23d79f | 341 | struct pam_response *reply; |
05114c74 | 342 | int i; |
343 | ||
60922169 | 344 | debug3("PAM: %s entering, %d messages", __func__, n); |
0a23d79f | 345 | *resp = NULL; |
346 | ||
d506e25f | 347 | if (data == NULL) { |
348 | error("PAM: conversation function passed a null context"); | |
349 | return (PAM_CONV_ERR); | |
350 | } | |
05114c74 | 351 | ctxt = data; |
352 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
353 | return (PAM_CONV_ERR); | |
0a23d79f | 354 | |
01d35895 | 355 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 356 | return (PAM_CONV_ERR); |
0a23d79f | 357 | |
05114c74 | 358 | buffer_init(&buffer); |
359 | for (i = 0; i < n; ++i) { | |
05114c74 | 360 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
361 | case PAM_PROMPT_ECHO_OFF: | |
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; | |
aff51935 | 367 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
7b2a0de3 | 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_PROMPT_ECHO_ON: | |
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; | |
379 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) | |
380 | goto fail; | |
05114c74 | 381 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
382 | goto fail; | |
0a23d79f | 383 | reply[i].resp = buffer_get_string(&buffer, NULL); |
05114c74 | 384 | break; |
385 | case PAM_ERROR_MSG: | |
aff51935 | 386 | buffer_put_cstring(&buffer, |
0a23d79f | 387 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 388 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 389 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
390 | goto fail; | |
05114c74 | 391 | break; |
392 | case PAM_TEXT_INFO: | |
aff51935 | 393 | buffer_put_cstring(&buffer, |
0a23d79f | 394 | PAM_MSG_MEMBER(msg, i, msg)); |
aff51935 | 395 | if (ssh_msg_send(ctxt->pam_csock, |
7b2a0de3 | 396 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
397 | goto fail; | |
05114c74 | 398 | break; |
399 | default: | |
400 | goto fail; | |
a5c9cd31 | 401 | } |
05114c74 | 402 | buffer_clear(&buffer); |
a5c9cd31 | 403 | } |
05114c74 | 404 | buffer_free(&buffer); |
0a23d79f | 405 | *resp = reply; |
05114c74 | 406 | return (PAM_SUCCESS); |
0a23d79f | 407 | |
05114c74 | 408 | fail: |
0a23d79f | 409 | for(i = 0; i < n; i++) { |
410 | if (reply[i].resp != NULL) | |
411 | xfree(reply[i].resp); | |
412 | } | |
413 | xfree(reply); | |
05114c74 | 414 | buffer_free(&buffer); |
415 | return (PAM_CONV_ERR); | |
416 | } | |
a5c9cd31 | 417 | |
05114c74 | 418 | /* |
419 | * Authentication thread. | |
420 | */ | |
421 | static void * | |
422 | sshpam_thread(void *ctxtp) | |
423 | { | |
424 | struct pam_ctxt *ctxt = ctxtp; | |
425 | Buffer buffer; | |
c53917a9 | 426 | struct pam_conv sshpam_conv; |
e4472e7e | 427 | int flags = (options.permit_empty_passwd == 0 ? |
428 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
b4143b2a | 429 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
2212fc98 | 430 | extern char **environ; |
431 | char **env_from_pam; | |
432 | u_int i; | |
05114c74 | 433 | const char *pam_user; |
44171182 | 434 | const char **ptr_pam_user = &pam_user; |
05114c74 | 435 | |
44171182 | 436 | pam_get_item(sshpam_handle, PAM_USER, |
437 | (sshpam_const void **)ptr_pam_user); | |
2212fc98 | 438 | environ[0] = NULL; |
da97d54d | 439 | |
440 | if (sshpam_authctxt != NULL) { | |
441 | setproctitle("%s [pam]", | |
442 | sshpam_authctxt->valid ? pam_user : "unknown"); | |
443 | } | |
05114c74 | 444 | #endif |
a5c9cd31 | 445 | |
c53917a9 | 446 | sshpam_conv.conv = sshpam_thread_conv; |
447 | sshpam_conv.appdata_ptr = ctxt; | |
448 | ||
d948154a | 449 | if (sshpam_authctxt == NULL) |
529d73ab | 450 | fatal("%s: PAM authctxt not initialized", __func__); |
451 | ||
05114c74 | 452 | buffer_init(&buffer); |
453 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
454 | (const void *)&sshpam_conv); | |
455 | if (sshpam_err != PAM_SUCCESS) | |
456 | goto auth_fail; | |
e4472e7e | 457 | sshpam_err = pam_authenticate(sshpam_handle, flags); |
05114c74 | 458 | if (sshpam_err != PAM_SUCCESS) |
459 | goto auth_fail; | |
b3ef7fb7 | 460 | |
2935db92 | 461 | if (compat20) { |
5aa56df0 | 462 | if (!do_pam_account()) { |
463 | sshpam_err = PAM_ACCT_EXPIRED; | |
b3ef7fb7 | 464 | goto auth_fail; |
5aa56df0 | 465 | } |
d948154a | 466 | if (sshpam_authctxt->force_pwchange) { |
b3ef7fb7 | 467 | sshpam_err = pam_chauthtok(sshpam_handle, |
468 | PAM_CHANGE_EXPIRED_AUTHTOK); | |
469 | if (sshpam_err != PAM_SUCCESS) | |
470 | goto auth_fail; | |
c10bb2ce | 471 | sshpam_password_change_required(0); |
b3ef7fb7 | 472 | } |
2935db92 | 473 | } |
b3ef7fb7 | 474 | |
05114c74 | 475 | buffer_put_cstring(&buffer, "OK"); |
2212fc98 | 476 | |
b4143b2a | 477 | #ifndef UNSUPPORTED_POSIX_THREADS_HACK |
b3ef7fb7 | 478 | /* Export variables set by do_pam_account */ |
479 | buffer_put_int(&buffer, sshpam_account_status); | |
d948154a | 480 | buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); |
b3ef7fb7 | 481 | |
2212fc98 | 482 | /* Export any environment strings set in child */ |
483 | for(i = 0; environ[i] != NULL; i++) | |
484 | ; /* Count */ | |
485 | buffer_put_int(&buffer, i); | |
486 | for(i = 0; environ[i] != NULL; i++) | |
487 | buffer_put_cstring(&buffer, environ[i]); | |
488 | ||
489 | /* Export any environment strings set by PAM in child */ | |
490 | env_from_pam = pam_getenvlist(sshpam_handle); | |
491 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
492 | ; /* Count */ | |
493 | buffer_put_int(&buffer, i); | |
494 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) | |
495 | buffer_put_cstring(&buffer, env_from_pam[i]); | |
b4143b2a | 496 | #endif /* UNSUPPORTED_POSIX_THREADS_HACK */ |
2212fc98 | 497 | |
7b2a0de3 | 498 | /* XXX - can't do much about an error here */ |
05114c74 | 499 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
500 | buffer_free(&buffer); | |
501 | pthread_exit(NULL); | |
502 | ||
503 | auth_fail: | |
504 | buffer_put_cstring(&buffer, | |
505 | pam_strerror(sshpam_handle, sshpam_err)); | |
7b2a0de3 | 506 | /* XXX - can't do much about an error here */ |
5aa56df0 | 507 | if (sshpam_err == PAM_ACCT_EXPIRED) |
508 | ssh_msg_send(ctxt->pam_csock, PAM_ACCT_EXPIRED, &buffer); | |
509 | else | |
510 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); | |
05114c74 | 511 | buffer_free(&buffer); |
512 | pthread_exit(NULL); | |
b6453d99 | 513 | |
05114c74 | 514 | return (NULL); /* Avoid warning for non-pthread case */ |
a5c9cd31 | 515 | } |
516 | ||
c6630044 | 517 | void |
518 | sshpam_thread_cleanup(void) | |
a5c9cd31 | 519 | { |
c6630044 | 520 | struct pam_ctxt *ctxt = cleanup_ctxt; |
521 | ||
90f3c272 | 522 | debug3("PAM: %s entering", __func__); |
c6630044 | 523 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
524 | pthread_cancel(ctxt->pam_thread); | |
525 | pthread_join(ctxt->pam_thread, NULL); | |
526 | close(ctxt->pam_psock); | |
527 | close(ctxt->pam_csock); | |
528 | memset(ctxt, 0, sizeof(*ctxt)); | |
529 | cleanup_ctxt = NULL; | |
530 | } | |
05114c74 | 531 | } |
a5c9cd31 | 532 | |
05114c74 | 533 | static int |
44171182 | 534 | sshpam_null_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 535 | struct pam_response **resp, void *data) |
05114c74 | 536 | { |
60922169 | 537 | debug3("PAM: %s entering, %d messages", __func__, n); |
05114c74 | 538 | return (PAM_CONV_ERR); |
539 | } | |
a5c9cd31 | 540 | |
05114c74 | 541 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
542 | ||
ab17aac2 | 543 | static int |
44171182 | 544 | sshpam_store_conv(int n, sshpam_const struct pam_message **msg, |
ab17aac2 | 545 | struct pam_response **resp, void *data) |
546 | { | |
547 | struct pam_response *reply; | |
548 | int i; | |
549 | size_t len; | |
550 | ||
551 | debug3("PAM: %s called with %d messages", __func__, n); | |
552 | *resp = NULL; | |
553 | ||
554 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
555 | return (PAM_CONV_ERR); | |
556 | ||
01d35895 | 557 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
ab17aac2 | 558 | return (PAM_CONV_ERR); |
ab17aac2 | 559 | |
560 | for (i = 0; i < n; ++i) { | |
561 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
562 | case PAM_ERROR_MSG: | |
563 | case PAM_TEXT_INFO: | |
564 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
565 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); | |
566 | buffer_append(&loginmsg, "\n", 1 ); | |
567 | reply[i].resp_retcode = PAM_SUCCESS; | |
568 | break; | |
569 | default: | |
570 | goto fail; | |
571 | } | |
572 | } | |
573 | *resp = reply; | |
574 | return (PAM_SUCCESS); | |
575 | ||
576 | fail: | |
577 | for(i = 0; i < n; i++) { | |
578 | if (reply[i].resp != NULL) | |
579 | xfree(reply[i].resp); | |
580 | } | |
581 | xfree(reply); | |
582 | return (PAM_CONV_ERR); | |
583 | } | |
584 | ||
585 | static struct pam_conv store_conv = { sshpam_store_conv, NULL }; | |
586 | ||
c6630044 | 587 | void |
588 | sshpam_cleanup(void) | |
05114c74 | 589 | { |
05114c74 | 590 | debug("PAM: cleanup"); |
0a23d79f | 591 | if (sshpam_handle == NULL) |
592 | return; | |
05114c74 | 593 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
594 | if (sshpam_cred_established) { | |
595 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); | |
596 | sshpam_cred_established = 0; | |
597 | } | |
598 | if (sshpam_session_open) { | |
599 | pam_close_session(sshpam_handle, PAM_SILENT); | |
600 | sshpam_session_open = 0; | |
a5c9cd31 | 601 | } |
dd1fb864 | 602 | sshpam_authenticated = 0; |
05114c74 | 603 | pam_end(sshpam_handle, sshpam_err); |
604 | sshpam_handle = NULL; | |
a5c9cd31 | 605 | } |
606 | ||
05114c74 | 607 | static int |
529d73ab | 608 | sshpam_init(Authctxt *authctxt) |
a5c9cd31 | 609 | { |
74678fb9 | 610 | extern char *__progname; |
529d73ab | 611 | const char *pam_rhost, *pam_user, *user = authctxt->user; |
44171182 | 612 | const char **ptr_pam_user = &pam_user; |
05114c74 | 613 | |
614 | if (sshpam_handle != NULL) { | |
615 | /* We already have a PAM context; check if the user matches */ | |
616 | sshpam_err = pam_get_item(sshpam_handle, | |
44171182 | 617 | PAM_USER, (sshpam_const void **)ptr_pam_user); |
05114c74 | 618 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) |
619 | return (0); | |
05114c74 | 620 | pam_end(sshpam_handle, sshpam_err); |
621 | sshpam_handle = NULL; | |
622 | } | |
623 | debug("PAM: initializing for \"%s\"", user); | |
01224183 | 624 | sshpam_err = |
ba6dd90e | 625 | pam_start(SSHD_PAM_SERVICE, user, &store_conv, &sshpam_handle); |
d948154a | 626 | sshpam_authctxt = authctxt; |
529d73ab | 627 | |
5ff453c0 | 628 | if (sshpam_err != PAM_SUCCESS) { |
629 | pam_end(sshpam_handle, sshpam_err); | |
630 | sshpam_handle = NULL; | |
05114c74 | 631 | return (-1); |
5ff453c0 | 632 | } |
c5a7d788 | 633 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
05d62329 | 634 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
05114c74 | 635 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
5ff453c0 | 636 | if (sshpam_err != PAM_SUCCESS) { |
5b9e2464 | 637 | pam_end(sshpam_handle, sshpam_err); |
5ff453c0 | 638 | sshpam_handle = NULL; |
639 | return (-1); | |
640 | } | |
641 | #ifdef PAM_TTY_KLUDGE | |
aff51935 | 642 | /* |
643 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. | |
644 | * sshd doesn't set the tty until too late in the auth process and | |
5ff453c0 | 645 | * may not even set one (for tty-less connections) |
aff51935 | 646 | */ |
5ff453c0 | 647 | debug("PAM: setting PAM_TTY to \"ssh\""); |
648 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); | |
05114c74 | 649 | if (sshpam_err != PAM_SUCCESS) { |
650 | pam_end(sshpam_handle, sshpam_err); | |
651 | sshpam_handle = NULL; | |
652 | return (-1); | |
a5c9cd31 | 653 | } |
5ff453c0 | 654 | #endif |
05114c74 | 655 | return (0); |
a5c9cd31 | 656 | } |
657 | ||
05114c74 | 658 | static void * |
659 | sshpam_init_ctx(Authctxt *authctxt) | |
a5c9cd31 | 660 | { |
05114c74 | 661 | struct pam_ctxt *ctxt; |
662 | int socks[2]; | |
2b87da3b | 663 | |
90f3c272 | 664 | debug3("PAM: %s entering", __func__); |
5aa56df0 | 665 | /* |
666 | * Refuse to start if we don't have PAM enabled or do_pam_account | |
667 | * has previously failed. | |
668 | */ | |
669 | if (!options.use_pam || sshpam_account_status == 0) | |
7fceb20d | 670 | return NULL; |
671 | ||
05114c74 | 672 | /* Initialize PAM */ |
529d73ab | 673 | if (sshpam_init(authctxt) == -1) { |
05114c74 | 674 | error("PAM: initialization failed"); |
675 | return (NULL); | |
676 | } | |
5c377b3b | 677 | |
05114c74 | 678 | ctxt = xmalloc(sizeof *ctxt); |
c6630044 | 679 | memset(ctxt, 0, sizeof(*ctxt)); |
05114c74 | 680 | |
681 | /* Start the authentication thread */ | |
682 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { | |
683 | error("PAM: failed create sockets: %s", strerror(errno)); | |
684 | xfree(ctxt); | |
685 | return (NULL); | |
686 | } | |
687 | ctxt->pam_psock = socks[0]; | |
688 | ctxt->pam_csock = socks[1]; | |
689 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { | |
690 | error("PAM: failed to start authentication thread: %s", | |
691 | strerror(errno)); | |
692 | close(socks[0]); | |
693 | close(socks[1]); | |
694 | xfree(ctxt); | |
695 | return (NULL); | |
a5c9cd31 | 696 | } |
c6630044 | 697 | cleanup_ctxt = ctxt; |
05114c74 | 698 | return (ctxt); |
699 | } | |
a5c9cd31 | 700 | |
05114c74 | 701 | static int |
702 | sshpam_query(void *ctx, char **name, char **info, | |
703 | u_int *num, char ***prompts, u_int **echo_on) | |
704 | { | |
705 | Buffer buffer; | |
706 | struct pam_ctxt *ctxt = ctx; | |
707 | size_t plen; | |
708 | u_char type; | |
709 | char *msg; | |
bbe58934 | 710 | size_t len, mlen; |
05114c74 | 711 | |
90f3c272 | 712 | debug3("PAM: %s entering", __func__); |
05114c74 | 713 | buffer_init(&buffer); |
714 | *name = xstrdup(""); | |
715 | *info = xstrdup(""); | |
716 | *prompts = xmalloc(sizeof(char *)); | |
717 | **prompts = NULL; | |
718 | plen = 0; | |
719 | *echo_on = xmalloc(sizeof(u_int)); | |
720 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { | |
721 | type = buffer_get_char(&buffer); | |
722 | msg = buffer_get_string(&buffer, NULL); | |
bbe58934 | 723 | mlen = strlen(msg); |
05114c74 | 724 | switch (type) { |
725 | case PAM_PROMPT_ECHO_ON: | |
726 | case PAM_PROMPT_ECHO_OFF: | |
727 | *num = 1; | |
bbe58934 | 728 | len = plen + mlen + 1; |
c5d10563 | 729 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 730 | strlcpy(**prompts + plen, msg, len - plen); |
731 | plen += mlen; | |
05114c74 | 732 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
733 | xfree(msg); | |
734 | return (0); | |
735 | case PAM_ERROR_MSG: | |
736 | case PAM_TEXT_INFO: | |
737 | /* accumulate messages */ | |
bbe58934 | 738 | len = plen + mlen + 2; |
c5d10563 | 739 | **prompts = xrealloc(**prompts, 1, len); |
bbe58934 | 740 | strlcpy(**prompts + plen, msg, len - plen); |
741 | plen += mlen; | |
742 | strlcat(**prompts + plen, "\n", len - plen); | |
743 | plen++; | |
05114c74 | 744 | xfree(msg); |
5daf7064 | 745 | break; |
5aa56df0 | 746 | case PAM_ACCT_EXPIRED: |
747 | sshpam_account_status = 0; | |
748 | /* FALLTHROUGH */ | |
05114c74 | 749 | case PAM_AUTH_ERR: |
5aa56df0 | 750 | debug3("PAM: %s", pam_strerror(sshpam_handle, type)); |
cafa6a80 | 751 | if (**prompts != NULL && strlen(**prompts) != 0) { |
752 | *info = **prompts; | |
753 | **prompts = NULL; | |
754 | *num = 0; | |
755 | **echo_on = 0; | |
756 | ctxt->pam_done = -1; | |
08a3f952 | 757 | xfree(msg); |
cafa6a80 | 758 | return 0; |
759 | } | |
760 | /* FALLTHROUGH */ | |
761 | case PAM_SUCCESS: | |
05114c74 | 762 | if (**prompts != NULL) { |
763 | /* drain any accumulated messages */ | |
3eaf3960 | 764 | debug("PAM: %s", **prompts); |
765 | buffer_append(&loginmsg, **prompts, | |
766 | strlen(**prompts)); | |
05114c74 | 767 | xfree(**prompts); |
768 | **prompts = NULL; | |
769 | } | |
770 | if (type == PAM_SUCCESS) { | |
2d5104e2 | 771 | if (!sshpam_authctxt->valid || |
772 | (sshpam_authctxt->pw->pw_uid == 0 && | |
773 | options.permit_root_login != PERMIT_YES)) | |
af0e5c2f | 774 | fatal("Internal error: PAM auth " |
775 | "succeeded when it should have " | |
776 | "failed"); | |
2212fc98 | 777 | import_environments(&buffer); |
05114c74 | 778 | *num = 0; |
779 | **echo_on = 0; | |
780 | ctxt->pam_done = 1; | |
781 | xfree(msg); | |
782 | return (0); | |
783 | } | |
1e08e787 | 784 | error("PAM: %s for %s%.100s from %.100s", msg, |
785 | sshpam_authctxt->valid ? "" : "illegal user ", | |
786 | sshpam_authctxt->user, | |
787 | get_remote_name_or_ip(utmp_len, options.use_dns)); | |
e250770b | 788 | /* FALLTHROUGH */ |
5daf7064 | 789 | default: |
05114c74 | 790 | *num = 0; |
791 | **echo_on = 0; | |
792 | xfree(msg); | |
793 | ctxt->pam_done = -1; | |
794 | return (-1); | |
795 | } | |
a5c9cd31 | 796 | } |
05114c74 | 797 | return (-1); |
a5c9cd31 | 798 | } |
799 | ||
05114c74 | 800 | /* XXX - see also comment in auth-chall.c:verify_response */ |
801 | static int | |
802 | sshpam_respond(void *ctx, u_int num, char **resp) | |
a5c9cd31 | 803 | { |
05114c74 | 804 | Buffer buffer; |
805 | struct pam_ctxt *ctxt = ctx; | |
806 | ||
912acf53 | 807 | debug2("PAM: %s entering, %u responses", __func__, num); |
05114c74 | 808 | switch (ctxt->pam_done) { |
809 | case 1: | |
810 | sshpam_authenticated = 1; | |
811 | return (0); | |
812 | case 0: | |
813 | break; | |
814 | default: | |
815 | return (-1); | |
a5c9cd31 | 816 | } |
05114c74 | 817 | if (num != 1) { |
818 | error("PAM: expected one response, got %u", num); | |
819 | return (-1); | |
820 | } | |
821 | buffer_init(&buffer); | |
2d5104e2 | 822 | if (sshpam_authctxt->valid && |
823 | (sshpam_authctxt->pw->pw_uid != 0 || | |
ed9e8be3 | 824 | options.permit_root_login == PERMIT_YES)) |
af0e5c2f | 825 | buffer_put_cstring(&buffer, *resp); |
826 | else | |
827 | buffer_put_cstring(&buffer, badpw); | |
7b2a0de3 | 828 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
829 | buffer_free(&buffer); | |
830 | return (-1); | |
831 | } | |
05114c74 | 832 | buffer_free(&buffer); |
833 | return (1); | |
a5c9cd31 | 834 | } |
835 | ||
05114c74 | 836 | static void |
837 | sshpam_free_ctx(void *ctxtp) | |
a5c9cd31 | 838 | { |
05114c74 | 839 | struct pam_ctxt *ctxt = ctxtp; |
39ce53de | 840 | |
90f3c272 | 841 | debug3("PAM: %s entering", __func__); |
c6630044 | 842 | sshpam_thread_cleanup(); |
05114c74 | 843 | xfree(ctxt); |
844 | /* | |
845 | * We don't call sshpam_cleanup() here because we may need the PAM | |
846 | * handle at a later stage, e.g. when setting up a session. It's | |
847 | * still on the cleanup list, so pam_end() *will* be called before | |
848 | * the server process terminates. | |
849 | */ | |
ad55cd03 | 850 | } |
851 | ||
05114c74 | 852 | KbdintDevice sshpam_device = { |
853 | "pam", | |
854 | sshpam_init_ctx, | |
855 | sshpam_query, | |
856 | sshpam_respond, | |
857 | sshpam_free_ctx | |
858 | }; | |
859 | ||
860 | KbdintDevice mm_sshpam_device = { | |
861 | "pam", | |
862 | mm_sshpam_init_ctx, | |
863 | mm_sshpam_query, | |
864 | mm_sshpam_respond, | |
865 | mm_sshpam_free_ctx | |
866 | }; | |
2919e060 | 867 | |
2b87da3b | 868 | /* |
05114c74 | 869 | * This replaces auth-pam.c |
ad55cd03 | 870 | */ |
05114c74 | 871 | void |
529d73ab | 872 | start_pam(Authctxt *authctxt) |
ad55cd03 | 873 | { |
817e6d38 | 874 | if (!options.use_pam) |
875 | fatal("PAM: initialisation requested when UsePAM=no"); | |
876 | ||
529d73ab | 877 | if (sshpam_init(authctxt) == -1) |
05114c74 | 878 | fatal("PAM: initialisation failed"); |
a5c9cd31 | 879 | } |
880 | ||
05114c74 | 881 | void |
882 | finish_pam(void) | |
a5c9cd31 | 883 | { |
c6630044 | 884 | sshpam_cleanup(); |
a5c9cd31 | 885 | } |
886 | ||
5b9e2464 | 887 | u_int |
888 | do_pam_account(void) | |
a5c9cd31 | 889 | { |
ba6dd90e | 890 | debug("%s: called", __func__); |
b3ef7fb7 | 891 | if (sshpam_account_status != -1) |
892 | return (sshpam_account_status); | |
893 | ||
5b9e2464 | 894 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
ba6dd90e | 895 | debug3("PAM: %s pam_acct_mgmt = %d (%s)", __func__, sshpam_err, |
896 | pam_strerror(sshpam_handle, sshpam_err)); | |
d1cf9a87 | 897 | |
b3ef7fb7 | 898 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { |
899 | sshpam_account_status = 0; | |
900 | return (sshpam_account_status); | |
5b9e2464 | 901 | } |
902 | ||
b3ef7fb7 | 903 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
c10bb2ce | 904 | sshpam_password_change_required(1); |
b3ef7fb7 | 905 | |
906 | sshpam_account_status = 1; | |
907 | return (sshpam_account_status); | |
05114c74 | 908 | } |
46c76c63 | 909 | |
49e82bb9 | 910 | void |
911 | do_pam_set_tty(const char *tty) | |
912 | { | |
26b3608b | 913 | if (tty != NULL) { |
914 | debug("PAM: setting PAM_TTY to \"%s\"", tty); | |
915 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); | |
916 | if (sshpam_err != PAM_SUCCESS) | |
917 | fatal("PAM: failed to set PAM_TTY: %s", | |
918 | pam_strerror(sshpam_handle, sshpam_err)); | |
919 | } | |
05114c74 | 920 | } |
cbd7492e | 921 | |
05114c74 | 922 | void |
923 | do_pam_setcred(int init) | |
924 | { | |
925 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, | |
ba6dd90e | 926 | (const void *)&store_conv); |
05114c74 | 927 | if (sshpam_err != PAM_SUCCESS) |
928 | fatal("PAM: failed to set PAM_CONV: %s", | |
929 | pam_strerror(sshpam_handle, sshpam_err)); | |
930 | if (init) { | |
931 | debug("PAM: establishing credentials"); | |
932 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); | |
933 | } else { | |
934 | debug("PAM: reinitializing credentials"); | |
935 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); | |
936 | } | |
937 | if (sshpam_err == PAM_SUCCESS) { | |
938 | sshpam_cred_established = 1; | |
939 | return; | |
940 | } | |
941 | if (sshpam_authenticated) | |
942 | fatal("PAM: pam_setcred(): %s", | |
943 | pam_strerror(sshpam_handle, sshpam_err)); | |
944 | else | |
945 | debug("PAM: pam_setcred(): %s", | |
946 | pam_strerror(sshpam_handle, sshpam_err)); | |
a5c9cd31 | 947 | } |
948 | ||
05114c74 | 949 | static int |
44171182 | 950 | sshpam_tty_conv(int n, sshpam_const struct pam_message **msg, |
5b9e2464 | 951 | struct pam_response **resp, void *data) |
ee48c949 | 952 | { |
05114c74 | 953 | char input[PAM_MAX_MSG_SIZE]; |
0a23d79f | 954 | struct pam_response *reply; |
ee48c949 | 955 | int i; |
956 | ||
60922169 | 957 | debug3("PAM: %s called with %d messages", __func__, n); |
958 | ||
0a23d79f | 959 | *resp = NULL; |
960 | ||
3eaf3960 | 961 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
05114c74 | 962 | return (PAM_CONV_ERR); |
0a23d79f | 963 | |
01d35895 | 964 | if ((reply = calloc(n, sizeof(*reply))) == NULL) |
0a23d79f | 965 | return (PAM_CONV_ERR); |
0a23d79f | 966 | |
05114c74 | 967 | for (i = 0; i < n; ++i) { |
968 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
969 | case PAM_PROMPT_ECHO_OFF: | |
0a23d79f | 970 | reply[i].resp = |
aff51935 | 971 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
05114c74 | 972 | RP_ALLOW_STDIN); |
0a23d79f | 973 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 974 | break; |
975 | case PAM_PROMPT_ECHO_ON: | |
74117b26 | 976 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
05114c74 | 977 | fgets(input, sizeof input, stdin); |
8936b151 | 978 | if ((reply[i].resp = strdup(input)) == NULL) |
979 | goto fail; | |
0a23d79f | 980 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 981 | break; |
982 | case PAM_ERROR_MSG: | |
983 | case PAM_TEXT_INFO: | |
74117b26 | 984 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
0a23d79f | 985 | reply[i].resp_retcode = PAM_SUCCESS; |
05114c74 | 986 | break; |
987 | default: | |
988 | goto fail; | |
989 | } | |
ee48c949 | 990 | } |
0a23d79f | 991 | *resp = reply; |
05114c74 | 992 | return (PAM_SUCCESS); |
0a23d79f | 993 | |
05114c74 | 994 | fail: |
0a23d79f | 995 | for(i = 0; i < n; i++) { |
996 | if (reply[i].resp != NULL) | |
997 | xfree(reply[i].resp); | |
998 | } | |
999 | xfree(reply); | |
05114c74 | 1000 | return (PAM_CONV_ERR); |
ee48c949 | 1001 | } |
1002 | ||
8600a4ab | 1003 | static struct pam_conv tty_conv = { sshpam_tty_conv, NULL }; |
3eaf3960 | 1004 | |
05114c74 | 1005 | /* |
1006 | * XXX this should be done in the authentication phase, but ssh1 doesn't | |
1007 | * support that | |
1008 | */ | |
1009 | void | |
1010 | do_pam_chauthtok(void) | |
a5c9cd31 | 1011 | { |
05114c74 | 1012 | if (use_privsep) |
5b9e2464 | 1013 | fatal("Password expired (unable to change with privsep)"); |
05114c74 | 1014 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
3eaf3960 | 1015 | (const void *)&tty_conv); |
05114c74 | 1016 | if (sshpam_err != PAM_SUCCESS) |
1017 | fatal("PAM: failed to set PAM_CONV: %s", | |
1018 | pam_strerror(sshpam_handle, sshpam_err)); | |
1019 | debug("PAM: changing password"); | |
1020 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); | |
1021 | if (sshpam_err != PAM_SUCCESS) | |
1022 | fatal("PAM: pam_chauthtok(): %s", | |
1023 | pam_strerror(sshpam_handle, sshpam_err)); | |
5daf7064 | 1024 | } |
1025 | ||
3eaf3960 | 1026 | void |
1027 | do_pam_session(void) | |
1028 | { | |
dd1fb864 | 1029 | debug3("PAM: opening session"); |
aff51935 | 1030 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
ef687c66 | 1031 | (const void *)&store_conv); |
3eaf3960 | 1032 | if (sshpam_err != PAM_SUCCESS) |
1033 | fatal("PAM: failed to set PAM_CONV: %s", | |
1034 | pam_strerror(sshpam_handle, sshpam_err)); | |
1035 | sshpam_err = pam_open_session(sshpam_handle, 0); | |
abdec250 | 1036 | if (sshpam_err == PAM_SUCCESS) |
1037 | sshpam_session_open = 1; | |
1038 | else { | |
1039 | sshpam_session_open = 0; | |
1040 | disable_forwarding(); | |
1041 | error("PAM: pam_open_session(): %s", | |
3eaf3960 | 1042 | pam_strerror(sshpam_handle, sshpam_err)); |
abdec250 | 1043 | } |
1044 | ||
1045 | } | |
1046 | ||
1047 | int | |
1048 | is_pam_session_open(void) | |
1049 | { | |
1050 | return sshpam_session_open; | |
3eaf3960 | 1051 | } |
1052 | ||
aff51935 | 1053 | /* |
749560dd | 1054 | * Set a PAM environment string. We need to do this so that the session |
1055 | * modules can handle things like Kerberos/GSI credentials that appear | |
1056 | * during the ssh authentication process. | |
1057 | */ | |
749560dd | 1058 | int |
aff51935 | 1059 | do_pam_putenv(char *name, char *value) |
749560dd | 1060 | { |
749560dd | 1061 | int ret = 1; |
b6453d99 | 1062 | #ifdef HAVE_PAM_PUTENV |
263c65df | 1063 | char *compound; |
1064 | size_t len; | |
1065 | ||
1066 | len = strlen(name) + strlen(value) + 2; | |
1067 | compound = xmalloc(len); | |
1068 | ||
1069 | snprintf(compound, len, "%s=%s", name, value); | |
1070 | ret = pam_putenv(sshpam_handle, compound); | |
1071 | xfree(compound); | |
749560dd | 1072 | #endif |
263c65df | 1073 | |
749560dd | 1074 | return (ret); |
1075 | } | |
1076 | ||
2212fc98 | 1077 | char ** |
1078 | fetch_pam_child_environment(void) | |
1079 | { | |
1080 | return sshpam_env; | |
1081 | } | |
1082 | ||
05114c74 | 1083 | char ** |
1084 | fetch_pam_environment(void) | |
1085 | { | |
05114c74 | 1086 | return (pam_getenvlist(sshpam_handle)); |
05114c74 | 1087 | } |
5c377b3b | 1088 | |
05114c74 | 1089 | void |
1090 | free_pam_environment(char **env) | |
1091 | { | |
1092 | char **envp; | |
5daf7064 | 1093 | |
0eb6370a | 1094 | if (env == NULL) |
1095 | return; | |
1096 | ||
05114c74 | 1097 | for (envp = env; *envp; envp++) |
1098 | xfree(*envp); | |
1099 | xfree(env); | |
a5c9cd31 | 1100 | } |
1101 | ||
5de92f17 | 1102 | /* |
1103 | * "Blind" conversation function for password authentication. Assumes that | |
1104 | * echo-off prompts are for the password and stores messages for later | |
1105 | * display. | |
1106 | */ | |
1107 | static int | |
44171182 | 1108 | sshpam_passwd_conv(int n, sshpam_const struct pam_message **msg, |
5de92f17 | 1109 | struct pam_response **resp, void *data) |
1110 | { | |
1111 | struct pam_response *reply; | |
1112 | int i; | |
1113 | size_t len; | |
1114 | ||
1115 | debug3("PAM: %s called with %d messages", __func__, n); | |
1116 | ||
1117 | *resp = NULL; | |
1118 | ||
1119 | if (n <= 0 || n > PAM_MAX_NUM_MSG) | |
1120 | return (PAM_CONV_ERR); | |
1121 | ||
1122 | if ((reply = malloc(n * sizeof(*reply))) == NULL) | |
1123 | return (PAM_CONV_ERR); | |
1124 | memset(reply, 0, n * sizeof(*reply)); | |
1125 | ||
1126 | for (i = 0; i < n; ++i) { | |
1127 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { | |
1128 | case PAM_PROMPT_ECHO_OFF: | |
1129 | if (sshpam_password == NULL) | |
1130 | goto fail; | |
8936b151 | 1131 | if ((reply[i].resp = strdup(sshpam_password)) == NULL) |
1132 | goto fail; | |
5de92f17 | 1133 | reply[i].resp_retcode = PAM_SUCCESS; |
1134 | break; | |
1135 | case PAM_ERROR_MSG: | |
1136 | case PAM_TEXT_INFO: | |
1137 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); | |
1138 | if (len > 0) { | |
1139 | buffer_append(&loginmsg, | |
1140 | PAM_MSG_MEMBER(msg, i, msg), len); | |
1141 | buffer_append(&loginmsg, "\n", 1); | |
1142 | } | |
8936b151 | 1143 | if ((reply[i].resp = strdup("")) == NULL) |
1144 | goto fail; | |
5de92f17 | 1145 | reply[i].resp_retcode = PAM_SUCCESS; |
1146 | break; | |
1147 | default: | |
1148 | goto fail; | |
1149 | } | |
1150 | } | |
1151 | *resp = reply; | |
1152 | return (PAM_SUCCESS); | |
1153 | ||
d1cf9a87 | 1154 | fail: |
5de92f17 | 1155 | for(i = 0; i < n; i++) { |
1156 | if (reply[i].resp != NULL) | |
1157 | xfree(reply[i].resp); | |
1158 | } | |
1159 | xfree(reply); | |
1160 | return (PAM_CONV_ERR); | |
1161 | } | |
1162 | ||
1163 | static struct pam_conv passwd_conv = { sshpam_passwd_conv, NULL }; | |
1164 | ||
1165 | /* | |
1166 | * Attempt password authentication via PAM | |
1167 | */ | |
1168 | int | |
1169 | sshpam_auth_passwd(Authctxt *authctxt, const char *password) | |
1170 | { | |
1171 | int flags = (options.permit_empty_passwd == 0 ? | |
1172 | PAM_DISALLOW_NULL_AUTHTOK : 0); | |
1173 | ||
1174 | if (!options.use_pam || sshpam_handle == NULL) | |
1175 | fatal("PAM: %s called when PAM disabled or failed to " | |
1176 | "initialise.", __func__); | |
1177 | ||
1178 | sshpam_password = password; | |
1179 | sshpam_authctxt = authctxt; | |
1180 | ||
0e716148 | 1181 | /* |
1182 | * If the user logging in is invalid, or is root but is not permitted | |
1183 | * by PermitRootLogin, use an invalid password to prevent leaking | |
1184 | * information via timing (eg if the PAM config has a delay on fail). | |
1185 | */ | |
2d5104e2 | 1186 | if (!authctxt->valid || (authctxt->pw->pw_uid == 0 && |
ed9e8be3 | 1187 | options.permit_root_login != PERMIT_YES)) |
0e716148 | 1188 | sshpam_password = badpw; |
1189 | ||
5de92f17 | 1190 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
1191 | (const void *)&passwd_conv); | |
1192 | if (sshpam_err != PAM_SUCCESS) | |
1193 | fatal("PAM: %s: failed to set PAM_CONV: %s", __func__, | |
1194 | pam_strerror(sshpam_handle, sshpam_err)); | |
1195 | ||
1196 | sshpam_err = pam_authenticate(sshpam_handle, flags); | |
1197 | sshpam_password = NULL; | |
2d5104e2 | 1198 | if (sshpam_err == PAM_SUCCESS && authctxt->valid) { |
5de92f17 | 1199 | debug("PAM: password authentication accepted for %.100s", |
1200 | authctxt->user); | |
ed9e8be3 | 1201 | return 1; |
5de92f17 | 1202 | } else { |
1203 | debug("PAM: password authentication failed for %.100s: %s", | |
1204 | authctxt->valid ? authctxt->user : "an illegal user", | |
1205 | pam_strerror(sshpam_handle, sshpam_err)); | |
1206 | return 0; | |
1207 | } | |
1208 | } | |
a5c9cd31 | 1209 | #endif /* USE_PAM */ |