blob: 99b03f45b19767b73da357e53dc852fa80f674e4 [file] [log] [blame]
Damien Millere72b7af1999-12-30 15:08:44 +11001/*
Damien Millere69f18c2000-06-12 16:38:54 +10002 * Copyright (c) 2000 Damien Miller. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
Damien Millere69f18c2000-06-12 16:38:54 +100012 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Millere72b7af1999-12-30 15:08:44 +110023 */
24
25#include "includes.h"
26
27#ifdef USE_PAM
Damien Millere72b7af1999-12-30 15:08:44 +110028#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000029#include "log.h"
Kevin Stevese683e762002-04-04 19:02:28 +000030#include "auth.h"
Kevin Steves63007d42002-07-21 17:57:01 +000031#include "auth-options.h"
Damien Miller63dc3e92001-02-07 12:58:33 +110032#include "auth-pam.h"
Damien Millere72b7af1999-12-30 15:08:44 +110033#include "servconf.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000034#include "canohost.h"
35#include "readpass.h"
Damien Millere72b7af1999-12-30 15:08:44 +110036
Kevin Steves85ecbe72001-04-20 17:43:47 +000037extern char *__progname;
38
Kevin Steves63007d42002-07-21 17:57:01 +000039extern int use_privsep;
40
Kevin Steves6a998eb2002-07-28 20:24:07 +000041RCSID("$Id: auth-pam.c,v 1.54 2002/07/28 20:24:08 stevesk Exp $");
Damien Miller2f6a0ad2000-05-31 11:20:11 +100042
43#define NEW_AUTHTOK_MSG \
Kevin Steves6cdecd02002-07-21 17:26:54 +000044 "Warning: Your password has expired, please change it now."
Kevin Steves63007d42002-07-21 17:57:01 +000045#define NEW_AUTHTOK_MSG_PRIVSEP \
46 "Your password has expired, the session cannot proceed."
Damien Millere72b7af1999-12-30 15:08:44 +110047
Damien Miller63dc3e92001-02-07 12:58:33 +110048static int do_pam_conversation(int num_msg, const struct pam_message **msg,
49 struct pam_response **resp, void *appdata_ptr);
Damien Millere72b7af1999-12-30 15:08:44 +110050
51/* module-local variables */
52static struct pam_conv conv = {
Kevin Steves3429a1b2002-07-21 22:49:47 +000053 (int (*)())do_pam_conversation,
Damien Millere72b7af1999-12-30 15:08:44 +110054 NULL
55};
Damien Miller646aa602001-02-15 11:51:32 +110056static char *__pam_msg = NULL;
57static pam_handle_t *__pamh = NULL;
58static const char *__pampasswd = NULL;
Damien Millere72b7af1999-12-30 15:08:44 +110059
Damien Miller63dc3e92001-02-07 12:58:33 +110060/* states for do_pam_conversation() */
Damien Millerb8481582000-12-03 11:51:51 +110061enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN;
Kevin Steves6cdecd02002-07-21 17:26:54 +000062/* remember whether pam_acct_mgmt() returned PAM_NEW_AUTHTOK_REQD */
Damien Miller9d5705a2000-09-16 16:09:27 +110063static int password_change_required = 0;
Damien Millerb8481582000-12-03 11:51:51 +110064/* remember whether the last pam_authenticate() succeeded or not */
65static int was_authenticated = 0;
66
Damien Miller646aa602001-02-15 11:51:32 +110067/* Remember what has been initialised */
68static int session_opened = 0;
69static int creds_set = 0;
70
Damien Millerb8481582000-12-03 11:51:51 +110071/* accessor which allows us to switch conversation structs according to
72 * the authentication method being used */
Damien Miller646aa602001-02-15 11:51:32 +110073void do_pam_set_conv(struct pam_conv *conv)
Damien Millerb8481582000-12-03 11:51:51 +110074{
Damien Miller646aa602001-02-15 11:51:32 +110075 pam_set_item(__pamh, PAM_CONV, conv);
Damien Millerb8481582000-12-03 11:51:51 +110076}
77
78/* start an authentication run */
79int do_pam_authenticate(int flags)
80{
Damien Miller646aa602001-02-15 11:51:32 +110081 int retval = pam_authenticate(__pamh, flags);
Damien Millerb8481582000-12-03 11:51:51 +110082 was_authenticated = (retval == PAM_SUCCESS);
83 return retval;
84}
Damien Miller9d5705a2000-09-16 16:09:27 +110085
86/*
87 * PAM conversation function.
88 * There are two states this can run in.
89 *
90 * INITIAL_LOGIN mode simply feeds the password from the client into
91 * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output
Damien Miller646aa602001-02-15 11:51:32 +110092 * messages with into __pam_msg. This is used during initial
Damien Miller9d5705a2000-09-16 16:09:27 +110093 * authentication to bypass the normal PAM password prompt.
94 *
Damien Miller09256482001-10-28 22:36:55 +110095 * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase()
Damien Miller9d5705a2000-09-16 16:09:27 +110096 * and outputs messages to stderr. This mode is used if pam_chauthtok()
97 * is called to update expired passwords.
98 */
Damien Miller63dc3e92001-02-07 12:58:33 +110099static int do_pam_conversation(int num_msg, const struct pam_message **msg,
Damien Millere72b7af1999-12-30 15:08:44 +1100100 struct pam_response **resp, void *appdata_ptr)
101{
102 struct pam_response *reply;
103 int count;
Damien Miller9d5705a2000-09-16 16:09:27 +1100104 char buf[1024];
Damien Millere72b7af1999-12-30 15:08:44 +1100105
106 /* PAM will free this later */
Damien Miller23fe57c2002-07-02 17:08:23 +1000107 reply = xmalloc(num_msg * sizeof(*reply));
Damien Millere72b7af1999-12-30 15:08:44 +1100108
Damien Miller9d5705a2000-09-16 16:09:27 +1100109 for (count = 0; count < num_msg; count++) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100110 if (pamstate == INITIAL_LOGIN) {
111 /*
112 * We can't use stdio yet, queue messages for
113 * printing later
114 */
115 switch(PAM_MSG_MEMBER(msg, count, msg_style)) {
Damien Miller9d5705a2000-09-16 16:09:27 +1100116 case PAM_PROMPT_ECHO_ON:
Damien Miller23fe57c2002-07-02 17:08:23 +1000117 xfree(reply);
Damien Miller63dc3e92001-02-07 12:58:33 +1100118 return PAM_CONV_ERR;
119 case PAM_PROMPT_ECHO_OFF:
Damien Miller646aa602001-02-15 11:51:32 +1100120 if (__pampasswd == NULL) {
Damien Miller23fe57c2002-07-02 17:08:23 +1000121 xfree(reply);
Damien Miller60819b42000-10-14 11:16:12 +1100122 return PAM_CONV_ERR;
Damien Miller60819b42000-10-14 11:16:12 +1100123 }
Damien Miller646aa602001-02-15 11:51:32 +1100124 reply[count].resp = xstrdup(__pampasswd);
Damien Millere72b7af1999-12-30 15:08:44 +1100125 reply[count].resp_retcode = PAM_SUCCESS;
Damien Miller9d5705a2000-09-16 16:09:27 +1100126 break;
127 case PAM_ERROR_MSG:
128 case PAM_TEXT_INFO:
Damien Miller23fe57c2002-07-02 17:08:23 +1000129 if (PAM_MSG_MEMBER(msg, count, msg) != NULL) {
Damien Miller646aa602001-02-15 11:51:32 +1100130 message_cat(&__pam_msg,
Damien Miller63dc3e92001-02-07 12:58:33 +1100131 PAM_MSG_MEMBER(msg, count, msg));
Damien Miller9d5705a2000-09-16 16:09:27 +1100132 }
Damien Millere72b7af1999-12-30 15:08:44 +1100133 reply[count].resp = xstrdup("");
Damien Miller9d5705a2000-09-16 16:09:27 +1100134 reply[count].resp_retcode = PAM_SUCCESS;
Damien Millere72b7af1999-12-30 15:08:44 +1100135 break;
Damien Millere72b7af1999-12-30 15:08:44 +1100136 default:
Damien Miller23fe57c2002-07-02 17:08:23 +1000137 xfree(reply);
Damien Millere72b7af1999-12-30 15:08:44 +1100138 return PAM_CONV_ERR;
Damien Miller63dc3e92001-02-07 12:58:33 +1100139 }
140 } else {
141 /*
142 * stdio is connected, so interact directly
143 */
144 switch(PAM_MSG_MEMBER(msg, count, msg_style)) {
145 case PAM_PROMPT_ECHO_ON:
146 fputs(PAM_MSG_MEMBER(msg, count, msg), stderr);
147 fgets(buf, sizeof(buf), stdin);
148 reply[count].resp = xstrdup(buf);
149 reply[count].resp_retcode = PAM_SUCCESS;
150 break;
151 case PAM_PROMPT_ECHO_OFF:
Damien Miller09256482001-10-28 22:36:55 +1100152 reply[count].resp =
Kevin Stevesfe2f4a12001-10-28 17:32:38 +0000153 read_passphrase(PAM_MSG_MEMBER(msg, count,
154 msg), RP_ALLOW_STDIN);
Damien Miller63dc3e92001-02-07 12:58:33 +1100155 reply[count].resp_retcode = PAM_SUCCESS;
156 break;
157 case PAM_ERROR_MSG:
158 case PAM_TEXT_INFO:
Kevin Steves6a998eb2002-07-28 20:24:07 +0000159 if (PAM_MSG_MEMBER(msg, count, msg) != NULL)
Damien Miller63dc3e92001-02-07 12:58:33 +1100160 fprintf(stderr, "%s\n",
161 PAM_MSG_MEMBER(msg, count, msg));
162 reply[count].resp = xstrdup("");
163 reply[count].resp_retcode = PAM_SUCCESS;
164 break;
165 default:
Damien Miller23fe57c2002-07-02 17:08:23 +1000166 xfree(reply);
Damien Miller63dc3e92001-02-07 12:58:33 +1100167 return PAM_CONV_ERR;
168 }
Damien Millere72b7af1999-12-30 15:08:44 +1100169 }
170 }
171
172 *resp = reply;
173
174 return PAM_SUCCESS;
175}
176
177/* Called at exit to cleanly shutdown PAM */
Damien Miller646aa602001-02-15 11:51:32 +1100178void do_pam_cleanup_proc(void *context)
Damien Millere72b7af1999-12-30 15:08:44 +1100179{
Damien Miller2e9adb22001-03-21 12:16:24 +1100180 int pam_retval = PAM_SUCCESS;
Damien Millere72b7af1999-12-30 15:08:44 +1100181
Damien Miller646aa602001-02-15 11:51:32 +1100182 if (__pamh && session_opened) {
183 pam_retval = pam_close_session(__pamh, 0);
Damien Miller63dc3e92001-02-07 12:58:33 +1100184 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000185 log("Cannot close PAM session[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100186 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100187 }
Damien Millere72b7af1999-12-30 15:08:44 +1100188
Damien Miller646aa602001-02-15 11:51:32 +1100189 if (__pamh && creds_set) {
190 pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED);
Damien Miller63dc3e92001-02-07 12:58:33 +1100191 if (pam_retval != PAM_SUCCESS)
192 debug("Cannot delete credentials[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100193 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100194 }
Damien Millere72b7af1999-12-30 15:08:44 +1100195
Damien Miller646aa602001-02-15 11:51:32 +1100196 if (__pamh) {
197 pam_retval = pam_end(__pamh, pam_retval);
Damien Miller63dc3e92001-02-07 12:58:33 +1100198 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000199 log("Cannot release PAM authentication[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100200 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100201 }
202}
203
204/* Attempt password authentation using PAM */
Kevin Stevese683e762002-04-04 19:02:28 +0000205int auth_pam_password(Authctxt *authctxt, const char *password)
Damien Millere72b7af1999-12-30 15:08:44 +1100206{
207 extern ServerOptions options;
208 int pam_retval;
Kevin Stevese683e762002-04-04 19:02:28 +0000209 struct passwd *pw = authctxt->pw;
Damien Millere72b7af1999-12-30 15:08:44 +1100210
Damien Miller646aa602001-02-15 11:51:32 +1100211 do_pam_set_conv(&conv);
Damien Millerb8481582000-12-03 11:51:51 +1100212
Damien Millere72b7af1999-12-30 15:08:44 +1100213 /* deny if no user. */
214 if (pw == NULL)
215 return 0;
Kevin Steves706e7a92001-04-23 18:38:37 +0000216 if (pw->pw_uid == 0 && options.permit_root_login == PERMIT_NO_PASSWD)
Damien Millere72b7af1999-12-30 15:08:44 +1100217 return 0;
218 if (*password == '\0' && options.permit_empty_passwd == 0)
219 return 0;
220
Damien Miller646aa602001-02-15 11:51:32 +1100221 __pampasswd = password;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000222
Damien Miller9d5705a2000-09-16 16:09:27 +1100223 pamstate = INITIAL_LOGIN;
Kevin Stevesde77b462001-11-09 20:22:16 +0000224 pam_retval = do_pam_authenticate(
225 options.permit_empty_passwd == 0 ? PAM_DISALLOW_NULL_AUTHTOK : 0);
Damien Millere72b7af1999-12-30 15:08:44 +1100226 if (pam_retval == PAM_SUCCESS) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100227 debug("PAM Password authentication accepted for "
228 "user \"%.100s\"", pw->pw_name);
Damien Millere72b7af1999-12-30 15:08:44 +1100229 return 1;
230 } else {
Damien Miller63dc3e92001-02-07 12:58:33 +1100231 debug("PAM Password authentication for \"%.100s\" "
232 "failed[%d]: %s", pw->pw_name, pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100233 PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100234 return 0;
235 }
236}
237
238/* Do account management using PAM */
239int do_pam_account(char *username, char *remote_user)
240{
241 int pam_retval;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000242
Damien Miller646aa602001-02-15 11:51:32 +1100243 do_pam_set_conv(&conv);
Damien Miller63dc3e92001-02-07 12:58:33 +1100244
Damien Miller63dc3e92001-02-07 12:58:33 +1100245 if (remote_user) {
Damien Millere72b7af1999-12-30 15:08:44 +1100246 debug("PAM setting ruser to \"%.200s\"", remote_user);
Damien Miller646aa602001-02-15 11:51:32 +1100247 pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user);
Damien Miller63dc3e92001-02-07 12:58:33 +1100248 if (pam_retval != PAM_SUCCESS)
249 fatal("PAM set ruser failed[%d]: %.200s", pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100250 PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100251 }
252
Damien Miller646aa602001-02-15 11:51:32 +1100253 pam_retval = pam_acct_mgmt(__pamh, 0);
Damien Miller79418552002-04-23 20:28:48 +1000254 debug2("pam_acct_mgmt() = %d", pam_retval);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000255 switch (pam_retval) {
256 case PAM_SUCCESS:
257 /* This is what we want */
258 break;
Damien Millerae9d5af2002-04-26 11:27:24 +1000259#if 0
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000260 case PAM_NEW_AUTHTOK_REQD:
Kevin Steves63007d42002-07-21 17:57:01 +0000261 message_cat(&__pam_msg, use_privsep ?
262 NEW_AUTHTOK_MSG_PRIVSEP : NEW_AUTHTOK_MSG);
Damien Miller9d5705a2000-09-16 16:09:27 +1100263 /* flag that password change is necessary */
264 password_change_required = 1;
Kevin Steves63007d42002-07-21 17:57:01 +0000265 /* disallow other functionality for now */
266 no_port_forwarding_flag |= 2;
267 no_agent_forwarding_flag |= 2;
268 no_x11_forwarding_flag |= 2;
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000269 break;
Damien Millerae9d5af2002-04-26 11:27:24 +1000270#endif
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000271 default:
Damien Miller63dc3e92001-02-07 12:58:33 +1100272 log("PAM rejected by account configuration[%d]: "
Damien Miller646aa602001-02-15 11:51:32 +1100273 "%.200s", pam_retval, PAM_STRERROR(__pamh,
Damien Miller63dc3e92001-02-07 12:58:33 +1100274 pam_retval));
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000275 return(0);
Damien Millere72b7af1999-12-30 15:08:44 +1100276 }
Kevin Stevesef4eea92001-02-05 12:42:17 +0000277
Damien Millere72b7af1999-12-30 15:08:44 +1100278 return(1);
279}
280
281/* Do PAM-specific session initialisation */
Damien Miller3e955e72000-01-27 10:55:38 +1100282void do_pam_session(char *username, const char *ttyname)
Damien Millere72b7af1999-12-30 15:08:44 +1100283{
284 int pam_retval;
285
Damien Miller882c2ee2001-03-01 09:18:57 +1100286 do_pam_set_conv(&conv);
287
Damien Millere72b7af1999-12-30 15:08:44 +1100288 if (ttyname != NULL) {
289 debug("PAM setting tty to \"%.200s\"", ttyname);
Damien Miller646aa602001-02-15 11:51:32 +1100290 pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname);
Damien Miller63dc3e92001-02-07 12:58:33 +1100291 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000292 fatal("PAM set tty failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100293 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100294 }
295
Damien Miller646aa602001-02-15 11:51:32 +1100296 pam_retval = pam_open_session(__pamh, 0);
Damien Miller63dc3e92001-02-07 12:58:33 +1100297 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000298 fatal("PAM session setup failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100299 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller31a501d2001-02-27 09:20:48 +1100300
Damien Miller3dfeee42001-02-14 00:43:55 +1100301 session_opened = 1;
Damien Millere72b7af1999-12-30 15:08:44 +1100302}
303
Kevin Stevesef4eea92001-02-05 12:42:17 +0000304/* Set PAM credentials */
Damien Millerf9e93002001-03-27 16:12:24 +1000305void do_pam_setcred(int init)
Damien Millere72b7af1999-12-30 15:08:44 +1100306{
307 int pam_retval;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000308
Damien Millerf762a4b2002-05-08 12:27:55 +1000309 if (__pamh == NULL)
310 return;
311
Damien Miller882c2ee2001-03-01 09:18:57 +1100312 do_pam_set_conv(&conv);
313
Damien Millere72b7af1999-12-30 15:08:44 +1100314 debug("PAM establishing creds");
Damien Millerf9e93002001-03-27 16:12:24 +1000315 pam_retval = pam_setcred(__pamh,
316 init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000317 if (pam_retval != PAM_SUCCESS) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100318 if (was_authenticated)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000319 fatal("PAM setcred failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100320 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller63dc3e92001-02-07 12:58:33 +1100321 else
Kevin Stevesef4eea92001-02-05 12:42:17 +0000322 debug("PAM setcred failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100323 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100324 } else
325 creds_set = 1;
Damien Miller9d5705a2000-09-16 16:09:27 +1100326}
327
Kevin Steves092f2ef2000-10-14 13:36:13 +0000328/* accessor function for file scope static variable */
Damien Miller646aa602001-02-15 11:51:32 +1100329int is_pam_password_change_required(void)
Kevin Steves092f2ef2000-10-14 13:36:13 +0000330{
331 return password_change_required;
332}
333
Kevin Stevesef4eea92001-02-05 12:42:17 +0000334/*
Damien Miller9d5705a2000-09-16 16:09:27 +1100335 * Have user change authentication token if pam_acct_mgmt() indicated
336 * it was expired. This needs to be called after an interactive
337 * session is established and the user's pty is connected to
Kevin Steves6cdecd02002-07-21 17:26:54 +0000338 * stdin/stdout/stderr.
Damien Miller9d5705a2000-09-16 16:09:27 +1100339 */
Kevin Steves6beac8c2000-10-14 15:08:49 +0000340void do_pam_chauthtok(void)
Damien Miller9d5705a2000-09-16 16:09:27 +1100341{
342 int pam_retval;
343
Damien Miller882c2ee2001-03-01 09:18:57 +1100344 do_pam_set_conv(&conv);
345
Damien Miller9d5705a2000-09-16 16:09:27 +1100346 if (password_change_required) {
Kevin Steves63007d42002-07-21 17:57:01 +0000347 if (use_privsep)
348 fatal("Password changing is currently unsupported"
349 " with privilege separation");
Damien Miller9d5705a2000-09-16 16:09:27 +1100350 pamstate = OTHER;
Damien Millerec7e1b12001-03-21 13:01:35 +1100351 pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
352 if (pam_retval != PAM_SUCCESS)
353 fatal("PAM pam_chauthtok failed[%d]: %.200s",
354 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Kevin Steves63007d42002-07-21 17:57:01 +0000355#if 0
356 /* XXX: This would need to be done in the parent process,
357 * but there's currently no way to pass such request. */
358 no_port_forwarding_flag &= ~2;
359 no_agent_forwarding_flag &= ~2;
360 no_x11_forwarding_flag &= ~2;
361 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
362 channel_permit_all_opens();
363#endif
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000364 }
Damien Millere72b7af1999-12-30 15:08:44 +1100365}
366
367/* Cleanly shutdown PAM */
368void finish_pam(void)
369{
Damien Miller646aa602001-02-15 11:51:32 +1100370 do_pam_cleanup_proc(NULL);
371 fatal_remove_cleanup(&do_pam_cleanup_proc, NULL);
Damien Millere72b7af1999-12-30 15:08:44 +1100372}
373
374/* Start PAM authentication for specified account */
Damien Miller22e22bf2001-01-19 15:46:38 +1100375void start_pam(const char *user)
Damien Millere72b7af1999-12-30 15:08:44 +1100376{
377 int pam_retval;
Damien Millerac2b1a52001-02-11 22:39:19 +1100378 extern ServerOptions options;
Kevin Steves5f3b9b92001-04-23 17:28:28 +0000379 extern u_int utmp_len;
380 const char *rhost;
Damien Millere72b7af1999-12-30 15:08:44 +1100381
Damien Miller22e22bf2001-01-19 15:46:38 +1100382 debug("Starting up PAM with username \"%.200s\"", user);
Damien Millere72b7af1999-12-30 15:08:44 +1100383
Damien Miller646aa602001-02-15 11:51:32 +1100384 pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh);
Damien Millere72b7af1999-12-30 15:08:44 +1100385
Damien Miller63dc3e92001-02-07 12:58:33 +1100386 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000387 fatal("PAM initialisation failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100388 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millerbd5817d2001-02-11 22:35:11 +1100389
Damien Millerf3451a22002-02-05 12:40:46 +1100390 rhost = get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping);
Kevin Steves5f3b9b92001-04-23 17:28:28 +0000391 debug("PAM setting rhost to \"%.200s\"", rhost);
392
393 pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost);
Damien Millerbd5817d2001-02-11 22:35:11 +1100394 if (pam_retval != PAM_SUCCESS)
395 fatal("PAM set rhost failed[%d]: %.200s", pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100396 PAM_STRERROR(__pamh, pam_retval));
Damien Miller4e997202000-07-09 21:21:52 +1000397#ifdef PAM_TTY_KLUDGE
Damien Millerc19fd5f2000-06-22 21:44:54 +1000398 /*
399 * Some PAM modules (e.g. pam_time) require a TTY to operate,
Kevin Stevesef4eea92001-02-05 12:42:17 +0000400 * and will fail in various stupid ways if they don't get one.
Damien Millerc19fd5f2000-06-22 21:44:54 +1000401 * sshd doesn't set the tty until too late in the auth process and may
402 * not even need one (for tty-less connections)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000403 * Kludge: Set a fake PAM_TTY
Damien Millerc19fd5f2000-06-22 21:44:54 +1000404 */
Damien Miller33cdd9e2001-10-28 22:33:48 +1100405 pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh");
Damien Miller63dc3e92001-02-07 12:58:33 +1100406 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000407 fatal("PAM set tty failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100408 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller4e997202000-07-09 21:21:52 +1000409#endif /* PAM_TTY_KLUDGE */
Damien Miller7b22d652000-06-18 14:07:04 +1000410
Damien Miller646aa602001-02-15 11:51:32 +1100411 fatal_add_cleanup(&do_pam_cleanup_proc, NULL);
Damien Millere72b7af1999-12-30 15:08:44 +1100412}
413
Kevin Steves6fa740b2002-07-23 00:51:53 +0000414/* Return list of PAM environment strings */
Damien Millere72b7af1999-12-30 15:08:44 +1100415char **fetch_pam_environment(void)
416{
Damien Miller1bead332000-04-30 00:47:29 +1000417#ifdef HAVE_PAM_GETENVLIST
Damien Miller646aa602001-02-15 11:51:32 +1100418 return(pam_getenvlist(__pamh));
Damien Miller1bead332000-04-30 00:47:29 +1000419#else /* HAVE_PAM_GETENVLIST */
420 return(NULL);
421#endif /* HAVE_PAM_GETENVLIST */
Damien Millere72b7af1999-12-30 15:08:44 +1100422}
423
Kevin Steves38b050a2002-07-23 00:44:07 +0000424void free_pam_environment(char **env)
425{
426 int i;
427
428 if (env != NULL) {
429 for (i = 0; env[i] != NULL; i++)
430 xfree(env[i]);
431 }
432}
433
Damien Millere72b7af1999-12-30 15:08:44 +1100434/* Print any messages that have been generated during authentication */
435/* or account checking to stderr */
436void print_pam_messages(void)
437{
Damien Miller646aa602001-02-15 11:51:32 +1100438 if (__pam_msg != NULL)
439 fputs(__pam_msg, stderr);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000440}
441
Damien Miller63dc3e92001-02-07 12:58:33 +1100442/* Append a message to buffer */
443void message_cat(char **p, const char *a)
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000444{
Damien Miller63dc3e92001-02-07 12:58:33 +1100445 char *cp;
446 size_t new_len;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000447
Damien Miller63dc3e92001-02-07 12:58:33 +1100448 new_len = strlen(a);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000449
Damien Miller63dc3e92001-02-07 12:58:33 +1100450 if (*p) {
451 size_t len = strlen(*p);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000452
Damien Miller63dc3e92001-02-07 12:58:33 +1100453 *p = xrealloc(*p, new_len + len + 2);
454 cp = *p + len;
455 } else
456 *p = cp = xmalloc(new_len + 2);
457
458 memcpy(cp, a, new_len);
459 cp[new_len] = '\n';
460 cp[new_len + 1] = '\0';
Damien Millere72b7af1999-12-30 15:08:44 +1100461}
462
463#endif /* USE_PAM */