blob: 11e53b61f821573dfc1f19c21a59943c6d10d5ed [file] [log] [blame]
Damien Miller4f9f42a2003-05-10 19:28:02 +10001/*-
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.
Damien Millere69f18c2000-06-12 16:38:54 +10009 *
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.
Damien Millere69f18c2000-06-12 16:38:54 +100018 *
Damien Miller4f9f42a2003-05-10 19:28:02 +100019 * 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.
Damien Millere72b7af1999-12-30 15:08:44 +110030 */
31
Damien Miller25d93422003-05-18 20:45:47 +100032/* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */
Damien Millere72b7af1999-12-30 15:08:44 +110033#include "includes.h"
Darren Tucker439ce0d2003-10-09 14:20:15 +100034RCSID("$Id: auth-pam.c,v 1.76 2003/10/09 04:20:15 dtucker Exp $");
Damien Millere72b7af1999-12-30 15:08:44 +110035
36#ifdef USE_PAM
Damien Miller4f9f42a2003-05-10 19:28:02 +100037#include <security/pam_appl.h>
38
Kevin Stevese683e762002-04-04 19:02:28 +000039#include "auth.h"
Damien Miller63dc3e92001-02-07 12:58:33 +110040#include "auth-pam.h"
Damien Miller4f9f42a2003-05-10 19:28:02 +100041#include "buffer.h"
42#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000043#include "canohost.h"
Damien Miller4f9f42a2003-05-10 19:28:02 +100044#include "log.h"
45#include "monitor_wrap.h"
46#include "msg.h"
47#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000048#include "readpass.h"
Damien Miller4f9f42a2003-05-10 19:28:02 +100049#include "servconf.h"
50#include "ssh2.h"
51#include "xmalloc.h"
Damien Miller1f499fd2003-08-25 13:08:49 +100052#include "auth-options.h"
Damien Millere72b7af1999-12-30 15:08:44 +110053
Damien Miller4e448a32003-05-14 15:11:48 +100054extern ServerOptions options;
55
Damien Miller4f9f42a2003-05-10 19:28:02 +100056#define __unused
Kevin Steves85ecbe72001-04-20 17:43:47 +000057
Damien Miller4f9f42a2003-05-10 19:28:02 +100058#ifdef USE_POSIX_THREADS
59#include <pthread.h>
60/*
61 * Avoid namespace clash when *not* using pthreads for systems *with*
62 * pthreads, which unconditionally define pthread_t via sys/types.h
63 * (e.g. Linux)
64 */
65typedef pthread_t sp_pthread_t;
66#else
67/*
68 * Simulate threads with processes.
69 */
70typedef pid_t sp_pthread_t;
Kevin Steves63007d42002-07-21 17:57:01 +000071
Damien Miller4f9f42a2003-05-10 19:28:02 +100072static void
73pthread_exit(void *value __unused)
74{
75 _exit(0);
76}
Damien Miller2f6a0ad2000-05-31 11:20:11 +100077
Damien Miller4f9f42a2003-05-10 19:28:02 +100078static int
79pthread_create(sp_pthread_t *thread, const void *attr __unused,
80 void *(*thread_start)(void *), void *arg)
81{
82 pid_t pid;
Damien Millere72b7af1999-12-30 15:08:44 +110083
Damien Miller4f9f42a2003-05-10 19:28:02 +100084 switch ((pid = fork())) {
85 case -1:
86 error("fork(): %s", strerror(errno));
87 return (-1);
88 case 0:
89 thread_start(arg);
90 _exit(1);
91 default:
92 *thread = pid;
93 return (0);
94 }
95}
Damien Millere72b7af1999-12-30 15:08:44 +110096
Damien Miller4f9f42a2003-05-10 19:28:02 +100097static int
98pthread_cancel(sp_pthread_t thread)
99{
100 return (kill(thread, SIGTERM));
101}
102
103static int
104pthread_join(sp_pthread_t thread, void **value __unused)
105{
106 int status;
107
108 waitpid(thread, &status, 0);
109 return (status);
110}
111#endif
112
113
Damien Miller5c3a5582003-09-23 22:12:38 +1000114static pam_handle_t *sshpam_handle = NULL;
115static int sshpam_err = 0;
116static int sshpam_authenticated = 0;
117static int sshpam_new_authtok_reqd = 0;
118static int sshpam_session_open = 0;
119static int sshpam_cred_established = 0;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000120
121struct pam_ctxt {
122 sp_pthread_t pam_thread;
123 int pam_psock;
124 int pam_csock;
125 int pam_done;
Damien Millere72b7af1999-12-30 15:08:44 +1100126};
Damien Millere72b7af1999-12-30 15:08:44 +1100127
Damien Miller4f9f42a2003-05-10 19:28:02 +1000128static void sshpam_free_ctx(void *);
Darren Tucker8846a072003-10-07 11:30:15 +1000129static struct pam_ctxt *cleanup_ctxt;
Damien Miller9d5705a2000-09-16 16:09:27 +1100130
131/*
Damien Miller4f9f42a2003-05-10 19:28:02 +1000132 * Conversation function for authentication thread.
Damien Miller9d5705a2000-09-16 16:09:27 +1100133 */
Damien Miller4f9f42a2003-05-10 19:28:02 +1000134static int
Damien Miller1f499fd2003-08-25 13:08:49 +1000135sshpam_thread_conv(int n, const struct pam_message **msg,
136 struct pam_response **resp, void *data)
Damien Millere72b7af1999-12-30 15:08:44 +1100137{
Damien Miller4f9f42a2003-05-10 19:28:02 +1000138 Buffer buffer;
139 struct pam_ctxt *ctxt;
Damien Miller5c3a5582003-09-23 22:12:38 +1000140 struct pam_response *reply;
Kevin Steves38b050a2002-07-23 00:44:07 +0000141 int i;
142
Damien Miller5c3a5582003-09-23 22:12:38 +1000143 *resp = NULL;
144
Damien Miller4f9f42a2003-05-10 19:28:02 +1000145 ctxt = data;
146 if (n <= 0 || n > PAM_MAX_NUM_MSG)
147 return (PAM_CONV_ERR);
Damien Miller5c3a5582003-09-23 22:12:38 +1000148
149 if ((reply = malloc(n * sizeof(*reply))) == NULL)
150 return (PAM_CONV_ERR);
151 memset(reply, 0, n * sizeof(*reply));
152
Damien Miller4f9f42a2003-05-10 19:28:02 +1000153 buffer_init(&buffer);
154 for (i = 0; i < n; ++i) {
Damien Miller4f9f42a2003-05-10 19:28:02 +1000155 switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
156 case PAM_PROMPT_ECHO_OFF:
Damien Miller5c3a5582003-09-23 22:12:38 +1000157 buffer_put_cstring(&buffer,
158 PAM_MSG_MEMBER(msg, i, msg));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000159 ssh_msg_send(ctxt->pam_csock,
160 PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
161 ssh_msg_recv(ctxt->pam_csock, &buffer);
162 if (buffer_get_char(&buffer) != PAM_AUTHTOK)
163 goto fail;
Damien Miller5c3a5582003-09-23 22:12:38 +1000164 reply[i].resp = buffer_get_string(&buffer, NULL);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000165 break;
166 case PAM_PROMPT_ECHO_ON:
Damien Miller5c3a5582003-09-23 22:12:38 +1000167 buffer_put_cstring(&buffer,
168 PAM_MSG_MEMBER(msg, i, msg));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000169 ssh_msg_send(ctxt->pam_csock,
170 PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
171 ssh_msg_recv(ctxt->pam_csock, &buffer);
172 if (buffer_get_char(&buffer) != PAM_AUTHTOK)
173 goto fail;
Damien Miller5c3a5582003-09-23 22:12:38 +1000174 reply[i].resp = buffer_get_string(&buffer, NULL);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000175 break;
176 case PAM_ERROR_MSG:
Damien Miller5c3a5582003-09-23 22:12:38 +1000177 buffer_put_cstring(&buffer,
178 PAM_MSG_MEMBER(msg, i, msg));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000179 ssh_msg_send(ctxt->pam_csock,
180 PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
181 break;
182 case PAM_TEXT_INFO:
Damien Miller5c3a5582003-09-23 22:12:38 +1000183 buffer_put_cstring(&buffer,
184 PAM_MSG_MEMBER(msg, i, msg));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000185 ssh_msg_send(ctxt->pam_csock,
186 PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
187 break;
188 default:
189 goto fail;
190 }
191 buffer_clear(&buffer);
Kevin Steves38b050a2002-07-23 00:44:07 +0000192 }
Damien Miller4f9f42a2003-05-10 19:28:02 +1000193 buffer_free(&buffer);
Damien Miller5c3a5582003-09-23 22:12:38 +1000194 *resp = reply;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000195 return (PAM_SUCCESS);
Damien Miller5c3a5582003-09-23 22:12:38 +1000196
Damien Miller4f9f42a2003-05-10 19:28:02 +1000197 fail:
Damien Miller5c3a5582003-09-23 22:12:38 +1000198 for(i = 0; i < n; i++) {
199 if (reply[i].resp != NULL)
200 xfree(reply[i].resp);
201 }
202 xfree(reply);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000203 buffer_free(&buffer);
204 return (PAM_CONV_ERR);
Kevin Steves38b050a2002-07-23 00:44:07 +0000205}
206
Damien Miller4f9f42a2003-05-10 19:28:02 +1000207/*
208 * Authentication thread.
209 */
210static void *
211sshpam_thread(void *ctxtp)
Damien Millere72b7af1999-12-30 15:08:44 +1100212{
Damien Miller4f9f42a2003-05-10 19:28:02 +1000213 struct pam_ctxt *ctxt = ctxtp;
214 Buffer buffer;
Damien Millerf4b6f102003-09-02 23:12:06 +1000215 struct pam_conv sshpam_conv;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000216#ifndef USE_POSIX_THREADS
217 const char *pam_user;
218
219 pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user);
220 setproctitle("%s [pam]", pam_user);
221#endif
222
Damien Millerf4b6f102003-09-02 23:12:06 +1000223 sshpam_conv.conv = sshpam_thread_conv;
224 sshpam_conv.appdata_ptr = ctxt;
225
Damien Miller4f9f42a2003-05-10 19:28:02 +1000226 buffer_init(&buffer);
227 sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
228 (const void *)&sshpam_conv);
229 if (sshpam_err != PAM_SUCCESS)
230 goto auth_fail;
231 sshpam_err = pam_authenticate(sshpam_handle, 0);
232 if (sshpam_err != PAM_SUCCESS)
233 goto auth_fail;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000234 buffer_put_cstring(&buffer, "OK");
235 ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer);
236 buffer_free(&buffer);
237 pthread_exit(NULL);
238
239 auth_fail:
240 buffer_put_cstring(&buffer,
241 pam_strerror(sshpam_handle, sshpam_err));
242 ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer);
243 buffer_free(&buffer);
244 pthread_exit(NULL);
245
246 return (NULL); /* Avoid warning for non-pthread case */
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000247}
248
Darren Tucker8846a072003-10-07 11:30:15 +1000249void
250sshpam_thread_cleanup(void)
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000251{
Darren Tucker8846a072003-10-07 11:30:15 +1000252 struct pam_ctxt *ctxt = cleanup_ctxt;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000253
Darren Tucker8846a072003-10-07 11:30:15 +1000254 if (ctxt != NULL && ctxt->pam_thread != 0) {
255 pthread_cancel(ctxt->pam_thread);
256 pthread_join(ctxt->pam_thread, NULL);
257 close(ctxt->pam_psock);
258 close(ctxt->pam_csock);
259 memset(ctxt, 0, sizeof(*ctxt));
260 cleanup_ctxt = NULL;
261 }
Damien Miller4f9f42a2003-05-10 19:28:02 +1000262}
Kevin Stevesef4eea92001-02-05 12:42:17 +0000263
Damien Miller4f9f42a2003-05-10 19:28:02 +1000264static int
Damien Miller1f499fd2003-08-25 13:08:49 +1000265sshpam_null_conv(int n, const struct pam_message **msg,
266 struct pam_response **resp, void *data)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000267{
Damien Miller4f9f42a2003-05-10 19:28:02 +1000268 return (PAM_CONV_ERR);
269}
Damien Miller63dc3e92001-02-07 12:58:33 +1100270
Damien Miller4f9f42a2003-05-10 19:28:02 +1000271static struct pam_conv null_conv = { sshpam_null_conv, NULL };
272
Darren Tucker8846a072003-10-07 11:30:15 +1000273void
274sshpam_cleanup(void)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000275{
Damien Miller4f9f42a2003-05-10 19:28:02 +1000276 debug("PAM: cleanup");
Damien Miller5c3a5582003-09-23 22:12:38 +1000277 if (sshpam_handle == NULL)
278 return;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000279 pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv);
280 if (sshpam_cred_established) {
281 pam_setcred(sshpam_handle, PAM_DELETE_CRED);
282 sshpam_cred_established = 0;
283 }
284 if (sshpam_session_open) {
285 pam_close_session(sshpam_handle, PAM_SILENT);
286 sshpam_session_open = 0;
287 }
288 sshpam_authenticated = sshpam_new_authtok_reqd = 0;
289 pam_end(sshpam_handle, sshpam_err);
290 sshpam_handle = NULL;
291}
292
293static int
294sshpam_init(const char *user)
295{
Damien Miller4f9f42a2003-05-10 19:28:02 +1000296 extern u_int utmp_len;
Darren Tucker455813b2003-09-13 22:12:11 +1000297 extern char *__progname;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000298 const char *pam_rhost, *pam_user;
299
300 if (sshpam_handle != NULL) {
301 /* We already have a PAM context; check if the user matches */
302 sshpam_err = pam_get_item(sshpam_handle,
303 PAM_USER, (const void **)&pam_user);
304 if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0)
305 return (0);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000306 pam_end(sshpam_handle, sshpam_err);
307 sshpam_handle = NULL;
308 }
309 debug("PAM: initializing for \"%s\"", user);
Darren Tuckerc58c2ee2003-09-13 22:02:05 +1000310 sshpam_err =
311 pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000312 if (sshpam_err != PAM_SUCCESS) {
313 pam_end(sshpam_handle, sshpam_err);
314 sshpam_handle = NULL;
315 return (-1);
316 }
Damien Miller3a961dc2003-06-03 10:25:48 +1000317 pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns);
Damien Miller46337202003-06-02 11:04:39 +1000318 debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
Damien Miller25d93422003-05-18 20:45:47 +1000319 sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost);
320 if (sshpam_err != PAM_SUCCESS) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000321 pam_end(sshpam_handle, sshpam_err);
Damien Miller25d93422003-05-18 20:45:47 +1000322 sshpam_handle = NULL;
323 return (-1);
324 }
325#ifdef PAM_TTY_KLUDGE
326 /*
327 * Some silly PAM modules (e.g. pam_time) require a TTY to operate.
328 * sshd doesn't set the tty until too late in the auth process and
329 * may not even set one (for tty-less connections)
330 */
331 debug("PAM: setting PAM_TTY to \"ssh\"");
332 sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh");
333 if (sshpam_err != PAM_SUCCESS) {
334 pam_end(sshpam_handle, sshpam_err);
335 sshpam_handle = NULL;
336 return (-1);
337 }
338#endif
Damien Miller4f9f42a2003-05-10 19:28:02 +1000339 return (0);
340}
341
342static void *
343sshpam_init_ctx(Authctxt *authctxt)
344{
345 struct pam_ctxt *ctxt;
346 int socks[2];
347
Damien Miller4e448a32003-05-14 15:11:48 +1000348 /* Refuse to start if we don't have PAM enabled */
349 if (!options.use_pam)
350 return NULL;
351
Damien Miller4f9f42a2003-05-10 19:28:02 +1000352 /* Initialize PAM */
353 if (sshpam_init(authctxt->user) == -1) {
354 error("PAM: initialization failed");
355 return (NULL);
356 }
357
358 ctxt = xmalloc(sizeof *ctxt);
Darren Tucker8846a072003-10-07 11:30:15 +1000359 memset(ctxt, 0, sizeof(*ctxt));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000360
361 /* Start the authentication thread */
362 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) {
363 error("PAM: failed create sockets: %s", strerror(errno));
364 xfree(ctxt);
365 return (NULL);
366 }
367 ctxt->pam_psock = socks[0];
368 ctxt->pam_csock = socks[1];
369 if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) {
370 error("PAM: failed to start authentication thread: %s",
371 strerror(errno));
372 close(socks[0]);
373 close(socks[1]);
374 xfree(ctxt);
375 return (NULL);
376 }
Darren Tucker8846a072003-10-07 11:30:15 +1000377 cleanup_ctxt = ctxt;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000378 return (ctxt);
379}
380
381static int
382sshpam_query(void *ctx, char **name, char **info,
383 u_int *num, char ***prompts, u_int **echo_on)
384{
385 Buffer buffer;
386 struct pam_ctxt *ctxt = ctx;
387 size_t plen;
388 u_char type;
389 char *msg;
Damien Miller7f2d7952003-07-30 14:53:11 +1000390 size_t len;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000391
392 buffer_init(&buffer);
393 *name = xstrdup("");
394 *info = xstrdup("");
395 *prompts = xmalloc(sizeof(char *));
396 **prompts = NULL;
397 plen = 0;
398 *echo_on = xmalloc(sizeof(u_int));
399 while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) {
400 type = buffer_get_char(&buffer);
401 msg = buffer_get_string(&buffer, NULL);
402 switch (type) {
403 case PAM_PROMPT_ECHO_ON:
404 case PAM_PROMPT_ECHO_OFF:
405 *num = 1;
Damien Miller7f2d7952003-07-30 14:53:11 +1000406 len = plen + strlen(msg) + 1;
407 **prompts = xrealloc(**prompts, len);
408 plen += snprintf(**prompts + plen, len, "%s", msg);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000409 **echo_on = (type == PAM_PROMPT_ECHO_ON);
410 xfree(msg);
411 return (0);
412 case PAM_ERROR_MSG:
413 case PAM_TEXT_INFO:
414 /* accumulate messages */
Damien Miller7f2d7952003-07-30 14:53:11 +1000415 len = plen + strlen(msg) + 1;
416 **prompts = xrealloc(**prompts, len);
417 plen += snprintf(**prompts + plen, len, "%s", msg);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000418 xfree(msg);
419 break;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000420 case PAM_SUCCESS:
421 case PAM_AUTH_ERR:
422 if (**prompts != NULL) {
423 /* drain any accumulated messages */
424#if 0 /* XXX - not compatible with privsep */
425 packet_start(SSH2_MSG_USERAUTH_BANNER);
426 packet_put_cstring(**prompts);
427 packet_put_cstring("");
428 packet_send();
429 packet_write_wait();
430#endif
431 xfree(**prompts);
432 **prompts = NULL;
433 }
434 if (type == PAM_SUCCESS) {
435 *num = 0;
436 **echo_on = 0;
437 ctxt->pam_done = 1;
438 xfree(msg);
439 return (0);
440 }
441 error("PAM: %s", msg);
Darren Tucker439ce0d2003-10-09 14:20:15 +1000442 /* FALLTHROUGH */
Damien Miller4f9f42a2003-05-10 19:28:02 +1000443 default:
444 *num = 0;
445 **echo_on = 0;
446 xfree(msg);
447 ctxt->pam_done = -1;
448 return (-1);
449 }
450 }
451 return (-1);
452}
453
454/* XXX - see also comment in auth-chall.c:verify_response */
455static int
456sshpam_respond(void *ctx, u_int num, char **resp)
457{
458 Buffer buffer;
459 struct pam_ctxt *ctxt = ctx;
460
461 debug2("PAM: %s", __func__);
462 switch (ctxt->pam_done) {
463 case 1:
464 sshpam_authenticated = 1;
465 return (0);
466 case 0:
467 break;
468 default:
469 return (-1);
470 }
471 if (num != 1) {
472 error("PAM: expected one response, got %u", num);
473 return (-1);
474 }
475 buffer_init(&buffer);
476 buffer_put_cstring(&buffer, *resp);
477 ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer);
478 buffer_free(&buffer);
479 return (1);
480}
481
482static void
483sshpam_free_ctx(void *ctxtp)
484{
485 struct pam_ctxt *ctxt = ctxtp;
486
Darren Tucker8846a072003-10-07 11:30:15 +1000487 sshpam_thread_cleanup();
Damien Miller4f9f42a2003-05-10 19:28:02 +1000488 xfree(ctxt);
489 /*
490 * We don't call sshpam_cleanup() here because we may need the PAM
491 * handle at a later stage, e.g. when setting up a session. It's
492 * still on the cleanup list, so pam_end() *will* be called before
493 * the server process terminates.
494 */
495}
496
497KbdintDevice sshpam_device = {
498 "pam",
499 sshpam_init_ctx,
500 sshpam_query,
501 sshpam_respond,
502 sshpam_free_ctx
503};
504
505KbdintDevice mm_sshpam_device = {
506 "pam",
507 mm_sshpam_init_ctx,
508 mm_sshpam_query,
509 mm_sshpam_respond,
510 mm_sshpam_free_ctx
511};
512
513/*
514 * This replaces auth-pam.c
515 */
516void
517start_pam(const char *user)
518{
Damien Miller9d507da2003-05-14 15:31:12 +1000519 if (!options.use_pam)
520 fatal("PAM: initialisation requested when UsePAM=no");
521
Damien Miller4f9f42a2003-05-10 19:28:02 +1000522 if (sshpam_init(user) == -1)
523 fatal("PAM: initialisation failed");
524}
525
526void
527finish_pam(void)
528{
Darren Tucker8846a072003-10-07 11:30:15 +1000529 sshpam_cleanup();
Damien Miller4f9f42a2003-05-10 19:28:02 +1000530}
531
Damien Miller1f499fd2003-08-25 13:08:49 +1000532u_int
533do_pam_account(void)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000534{
Damien Miller1f499fd2003-08-25 13:08:49 +1000535 sshpam_err = pam_acct_mgmt(sshpam_handle, 0);
536 debug3("%s: pam_acct_mgmt = %d", __func__, sshpam_err);
537
538 if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD)
539 return (0);
540
541 if (sshpam_err == PAM_NEW_AUTHTOK_REQD) {
542 sshpam_new_authtok_reqd = 1;
543
544 /* Prevent forwardings until password changed */
545 no_port_forwarding_flag |= 2;
546 no_agent_forwarding_flag |= 2;
547 no_x11_forwarding_flag |= 2;
548 }
549
Damien Miller4f9f42a2003-05-10 19:28:02 +1000550 return (1);
551}
552
553void
Damien Miller341c6e62003-09-02 23:18:52 +1000554do_pam_session(void)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000555{
556 sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
557 (const void *)&null_conv);
558 if (sshpam_err != PAM_SUCCESS)
559 fatal("PAM: failed to set PAM_CONV: %s",
560 pam_strerror(sshpam_handle, sshpam_err));
Damien Miller341c6e62003-09-02 23:18:52 +1000561 sshpam_err = pam_open_session(sshpam_handle, 0);
562 if (sshpam_err != PAM_SUCCESS)
563 fatal("PAM: pam_open_session(): %s",
564 pam_strerror(sshpam_handle, sshpam_err));
565 sshpam_session_open = 1;
566}
567
568void
569do_pam_set_tty(const char *tty)
570{
Darren Tuckerf38db7f2003-08-08 13:43:37 +1000571 if (tty != NULL) {
572 debug("PAM: setting PAM_TTY to \"%s\"", tty);
573 sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty);
574 if (sshpam_err != PAM_SUCCESS)
575 fatal("PAM: failed to set PAM_TTY: %s",
576 pam_strerror(sshpam_handle, sshpam_err));
577 }
Damien Miller4f9f42a2003-05-10 19:28:02 +1000578}
579
580void
581do_pam_setcred(int init)
582{
583 sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
584 (const void *)&null_conv);
585 if (sshpam_err != PAM_SUCCESS)
586 fatal("PAM: failed to set PAM_CONV: %s",
587 pam_strerror(sshpam_handle, sshpam_err));
588 if (init) {
589 debug("PAM: establishing credentials");
590 sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED);
591 } else {
592 debug("PAM: reinitializing credentials");
593 sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED);
594 }
595 if (sshpam_err == PAM_SUCCESS) {
596 sshpam_cred_established = 1;
597 return;
598 }
599 if (sshpam_authenticated)
600 fatal("PAM: pam_setcred(): %s",
601 pam_strerror(sshpam_handle, sshpam_err));
602 else
603 debug("PAM: pam_setcred(): %s",
604 pam_strerror(sshpam_handle, sshpam_err));
605}
606
607int
608is_pam_password_change_required(void)
609{
610 return (sshpam_new_authtok_reqd);
611}
612
613static int
Damien Miller1f499fd2003-08-25 13:08:49 +1000614pam_chauthtok_conv(int n, const struct pam_message **msg,
615 struct pam_response **resp, void *data)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000616{
617 char input[PAM_MAX_MSG_SIZE];
Damien Miller5c3a5582003-09-23 22:12:38 +1000618 struct pam_response *reply;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000619 int i;
620
Damien Miller5c3a5582003-09-23 22:12:38 +1000621 *resp = NULL;
622
Damien Miller4f9f42a2003-05-10 19:28:02 +1000623 if (n <= 0 || n > PAM_MAX_NUM_MSG)
624 return (PAM_CONV_ERR);
Damien Miller5c3a5582003-09-23 22:12:38 +1000625
626 if ((reply = malloc(n * sizeof(*reply))) == NULL)
627 return (PAM_CONV_ERR);
628 memset(reply, 0, n * sizeof(*reply));
629
Damien Miller4f9f42a2003-05-10 19:28:02 +1000630 for (i = 0; i < n; ++i) {
631 switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
632 case PAM_PROMPT_ECHO_OFF:
Damien Miller5c3a5582003-09-23 22:12:38 +1000633 reply[i].resp =
Damien Miller4f9f42a2003-05-10 19:28:02 +1000634 read_passphrase(PAM_MSG_MEMBER(msg, i, msg),
635 RP_ALLOW_STDIN);
Damien Miller5c3a5582003-09-23 22:12:38 +1000636 reply[i].resp_retcode = PAM_SUCCESS;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000637 break;
638 case PAM_PROMPT_ECHO_ON:
639 fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
640 fgets(input, sizeof input, stdin);
Damien Miller5c3a5582003-09-23 22:12:38 +1000641 reply[i].resp = xstrdup(input);
642 reply[i].resp_retcode = PAM_SUCCESS;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000643 break;
644 case PAM_ERROR_MSG:
645 case PAM_TEXT_INFO:
646 fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
Damien Miller5c3a5582003-09-23 22:12:38 +1000647 reply[i].resp_retcode = PAM_SUCCESS;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000648 break;
649 default:
650 goto fail;
651 }
652 }
Damien Miller5c3a5582003-09-23 22:12:38 +1000653 *resp = reply;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000654 return (PAM_SUCCESS);
Damien Miller5c3a5582003-09-23 22:12:38 +1000655
Damien Miller4f9f42a2003-05-10 19:28:02 +1000656 fail:
Damien Miller5c3a5582003-09-23 22:12:38 +1000657 for(i = 0; i < n; i++) {
658 if (reply[i].resp != NULL)
659 xfree(reply[i].resp);
660 }
661 xfree(reply);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000662 return (PAM_CONV_ERR);
663}
664
665/*
666 * XXX this should be done in the authentication phase, but ssh1 doesn't
667 * support that
668 */
669void
670do_pam_chauthtok(void)
671{
Damien Millerf4b6f102003-09-02 23:12:06 +1000672 struct pam_conv pam_conv;
673
674 pam_conv.conv = pam_chauthtok_conv;
675 pam_conv.appdata_ptr = NULL;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000676
677 if (use_privsep)
Damien Miller1f499fd2003-08-25 13:08:49 +1000678 fatal("Password expired (unable to change with privsep)");
Damien Miller4f9f42a2003-05-10 19:28:02 +1000679 sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
680 (const void *)&pam_conv);
681 if (sshpam_err != PAM_SUCCESS)
682 fatal("PAM: failed to set PAM_CONV: %s",
683 pam_strerror(sshpam_handle, sshpam_err));
684 debug("PAM: changing password");
685 sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK);
686 if (sshpam_err != PAM_SUCCESS)
687 fatal("PAM: pam_chauthtok(): %s",
688 pam_strerror(sshpam_handle, sshpam_err));
689}
690
Darren Tucker49aaf4a2003-08-26 11:58:16 +1000691/*
692 * Set a PAM environment string. We need to do this so that the session
693 * modules can handle things like Kerberos/GSI credentials that appear
694 * during the ssh authentication process.
695 */
696
697int
698do_pam_putenv(char *name, char *value)
699{
Darren Tucker49aaf4a2003-08-26 11:58:16 +1000700 int ret = 1;
Darren Tucker49aaf4a2003-08-26 11:58:16 +1000701#ifdef HAVE_PAM_PUTENV
Damien Millerf2728092003-09-17 07:24:25 +1000702 char *compound;
703 size_t len;
704
705 len = strlen(name) + strlen(value) + 2;
706 compound = xmalloc(len);
707
708 snprintf(compound, len, "%s=%s", name, value);
709 ret = pam_putenv(sshpam_handle, compound);
710 xfree(compound);
Darren Tucker49aaf4a2003-08-26 11:58:16 +1000711#endif
Damien Millerf2728092003-09-17 07:24:25 +1000712
Darren Tucker49aaf4a2003-08-26 11:58:16 +1000713 return (ret);
714}
715
Damien Miller4f9f42a2003-05-10 19:28:02 +1000716void
717print_pam_messages(void)
718{
719 /* XXX */
720}
721
722char **
723fetch_pam_environment(void)
724{
725#ifdef HAVE_PAM_GETENVLIST
726 debug("PAM: retrieving environment");
727 return (pam_getenvlist(sshpam_handle));
728#else
729 return (NULL);
730#endif
731}
732
733void
734free_pam_environment(char **env)
735{
736 char **envp;
737
Damien Millere27c6cc2003-05-16 18:21:01 +1000738 if (env == NULL)
739 return;
740
Damien Miller4f9f42a2003-05-10 19:28:02 +1000741 for (envp = env; *envp; envp++)
742 xfree(*envp);
743 xfree(env);
Damien Millere72b7af1999-12-30 15:08:44 +1100744}
745
746#endif /* USE_PAM */