blob: ce49845320978192222ac0436aae1174987b8c26 [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
28#include "ssh.h"
29#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000030#include "log.h"
Damien Miller63dc3e92001-02-07 12:58:33 +110031#include "auth-pam.h"
Damien Millere72b7af1999-12-30 15:08:44 +110032#include "servconf.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000033#include "canohost.h"
34#include "readpass.h"
Damien Millere72b7af1999-12-30 15:08:44 +110035
Damien Miller882c2ee2001-03-01 09:18:57 +110036RCSID("$Id: auth-pam.c,v 1.31 2001/02/28 22:18:58 djm Exp $");
Damien Miller2f6a0ad2000-05-31 11:20:11 +100037
38#define NEW_AUTHTOK_MSG \
Damien Miller9d5705a2000-09-16 16:09:27 +110039 "Warning: Your password has expired, please change it now"
Damien Millere72b7af1999-12-30 15:08:44 +110040
Damien Miller63dc3e92001-02-07 12:58:33 +110041static int do_pam_conversation(int num_msg, const struct pam_message **msg,
42 struct pam_response **resp, void *appdata_ptr);
Damien Millere72b7af1999-12-30 15:08:44 +110043
44/* module-local variables */
45static struct pam_conv conv = {
Damien Miller63dc3e92001-02-07 12:58:33 +110046 do_pam_conversation,
Damien Millere72b7af1999-12-30 15:08:44 +110047 NULL
48};
Damien Miller646aa602001-02-15 11:51:32 +110049static char *__pam_msg = NULL;
50static pam_handle_t *__pamh = NULL;
51static const char *__pampasswd = NULL;
Damien Millere72b7af1999-12-30 15:08:44 +110052
Damien Miller63dc3e92001-02-07 12:58:33 +110053/* states for do_pam_conversation() */
Damien Millerb8481582000-12-03 11:51:51 +110054enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN;
Damien Miller9d5705a2000-09-16 16:09:27 +110055/* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */
56static int password_change_required = 0;
Damien Millerb8481582000-12-03 11:51:51 +110057/* remember whether the last pam_authenticate() succeeded or not */
58static int was_authenticated = 0;
59
Damien Miller646aa602001-02-15 11:51:32 +110060/* Remember what has been initialised */
61static int session_opened = 0;
62static int creds_set = 0;
63
Damien Millerb8481582000-12-03 11:51:51 +110064/* accessor which allows us to switch conversation structs according to
65 * the authentication method being used */
Damien Miller646aa602001-02-15 11:51:32 +110066void do_pam_set_conv(struct pam_conv *conv)
Damien Millerb8481582000-12-03 11:51:51 +110067{
Damien Miller646aa602001-02-15 11:51:32 +110068 pam_set_item(__pamh, PAM_CONV, conv);
Damien Millerb8481582000-12-03 11:51:51 +110069}
70
71/* start an authentication run */
72int do_pam_authenticate(int flags)
73{
Damien Miller646aa602001-02-15 11:51:32 +110074 int retval = pam_authenticate(__pamh, flags);
Damien Millerb8481582000-12-03 11:51:51 +110075 was_authenticated = (retval == PAM_SUCCESS);
76 return retval;
77}
Damien Miller9d5705a2000-09-16 16:09:27 +110078
79/*
80 * PAM conversation function.
81 * There are two states this can run in.
82 *
83 * INITIAL_LOGIN mode simply feeds the password from the client into
84 * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output
Damien Miller646aa602001-02-15 11:51:32 +110085 * messages with into __pam_msg. This is used during initial
Damien Miller9d5705a2000-09-16 16:09:27 +110086 * authentication to bypass the normal PAM password prompt.
87 *
88 * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1)
89 * and outputs messages to stderr. This mode is used if pam_chauthtok()
90 * is called to update expired passwords.
91 */
Damien Miller63dc3e92001-02-07 12:58:33 +110092static int do_pam_conversation(int num_msg, const struct pam_message **msg,
Damien Millere72b7af1999-12-30 15:08:44 +110093 struct pam_response **resp, void *appdata_ptr)
94{
95 struct pam_response *reply;
96 int count;
Damien Miller9d5705a2000-09-16 16:09:27 +110097 char buf[1024];
Damien Millere72b7af1999-12-30 15:08:44 +110098
99 /* PAM will free this later */
100 reply = malloc(num_msg * sizeof(*reply));
101 if (reply == NULL)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000102 return PAM_CONV_ERR;
Damien Millere72b7af1999-12-30 15:08:44 +1100103
Damien Miller9d5705a2000-09-16 16:09:27 +1100104 for (count = 0; count < num_msg; count++) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100105 if (pamstate == INITIAL_LOGIN) {
106 /*
107 * We can't use stdio yet, queue messages for
108 * printing later
109 */
110 switch(PAM_MSG_MEMBER(msg, count, msg_style)) {
Damien Miller9d5705a2000-09-16 16:09:27 +1100111 case PAM_PROMPT_ECHO_ON:
Damien Miller63dc3e92001-02-07 12:58:33 +1100112 free(reply);
113 return PAM_CONV_ERR;
114 case PAM_PROMPT_ECHO_OFF:
Damien Miller646aa602001-02-15 11:51:32 +1100115 if (__pampasswd == NULL) {
Damien Miller60819b42000-10-14 11:16:12 +1100116 free(reply);
117 return PAM_CONV_ERR;
Damien Miller60819b42000-10-14 11:16:12 +1100118 }
Damien Miller646aa602001-02-15 11:51:32 +1100119 reply[count].resp = xstrdup(__pampasswd);
Damien Millere72b7af1999-12-30 15:08:44 +1100120 reply[count].resp_retcode = PAM_SUCCESS;
Damien Miller9d5705a2000-09-16 16:09:27 +1100121 break;
122 case PAM_ERROR_MSG:
123 case PAM_TEXT_INFO:
124 if ((*msg)[count].msg != NULL) {
Damien Miller646aa602001-02-15 11:51:32 +1100125 message_cat(&__pam_msg,
Damien Miller63dc3e92001-02-07 12:58:33 +1100126 PAM_MSG_MEMBER(msg, count, msg));
Damien Miller9d5705a2000-09-16 16:09:27 +1100127 }
Damien Millere72b7af1999-12-30 15:08:44 +1100128 reply[count].resp = xstrdup("");
Damien Miller9d5705a2000-09-16 16:09:27 +1100129 reply[count].resp_retcode = PAM_SUCCESS;
Damien Millere72b7af1999-12-30 15:08:44 +1100130 break;
Damien Millere72b7af1999-12-30 15:08:44 +1100131 default:
132 free(reply);
133 return PAM_CONV_ERR;
Damien Miller63dc3e92001-02-07 12:58:33 +1100134 }
135 } else {
136 /*
137 * stdio is connected, so interact directly
138 */
139 switch(PAM_MSG_MEMBER(msg, count, msg_style)) {
140 case PAM_PROMPT_ECHO_ON:
141 fputs(PAM_MSG_MEMBER(msg, count, msg), stderr);
142 fgets(buf, sizeof(buf), stdin);
143 reply[count].resp = xstrdup(buf);
144 reply[count].resp_retcode = PAM_SUCCESS;
145 break;
146 case PAM_PROMPT_ECHO_OFF:
147 reply[count].resp = xstrdup(
148 read_passphrase(PAM_MSG_MEMBER(msg, count,
149 msg), 1));
150 reply[count].resp_retcode = PAM_SUCCESS;
151 break;
152 case PAM_ERROR_MSG:
153 case PAM_TEXT_INFO:
154 if ((*msg)[count].msg != NULL)
155 fprintf(stderr, "%s\n",
156 PAM_MSG_MEMBER(msg, count, msg));
157 reply[count].resp = xstrdup("");
158 reply[count].resp_retcode = PAM_SUCCESS;
159 break;
160 default:
161 free(reply);
162 return PAM_CONV_ERR;
163 }
Damien Millere72b7af1999-12-30 15:08:44 +1100164 }
165 }
166
167 *resp = reply;
168
169 return PAM_SUCCESS;
170}
171
172/* Called at exit to cleanly shutdown PAM */
Damien Miller646aa602001-02-15 11:51:32 +1100173void do_pam_cleanup_proc(void *context)
Damien Millere72b7af1999-12-30 15:08:44 +1100174{
175 int pam_retval;
176
Damien Miller646aa602001-02-15 11:51:32 +1100177 if (__pamh && session_opened) {
178 pam_retval = pam_close_session(__pamh, 0);
Damien Miller63dc3e92001-02-07 12:58:33 +1100179 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000180 log("Cannot close PAM session[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100181 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100182 }
Damien Millere72b7af1999-12-30 15:08:44 +1100183
Damien Miller646aa602001-02-15 11:51:32 +1100184 if (__pamh && creds_set) {
185 pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED);
Damien Miller63dc3e92001-02-07 12:58:33 +1100186 if (pam_retval != PAM_SUCCESS)
187 debug("Cannot delete credentials[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100188 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100189 }
Damien Millere72b7af1999-12-30 15:08:44 +1100190
Damien Miller646aa602001-02-15 11:51:32 +1100191 if (__pamh) {
192 pam_retval = pam_end(__pamh, pam_retval);
Damien Miller63dc3e92001-02-07 12:58:33 +1100193 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000194 log("Cannot release PAM authentication[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100195 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100196 }
197}
198
199/* Attempt password authentation using PAM */
200int auth_pam_password(struct passwd *pw, const char *password)
201{
202 extern ServerOptions options;
203 int pam_retval;
204
Damien Miller646aa602001-02-15 11:51:32 +1100205 do_pam_set_conv(&conv);
Damien Millerb8481582000-12-03 11:51:51 +1100206
Damien Millere72b7af1999-12-30 15:08:44 +1100207 /* deny if no user. */
208 if (pw == NULL)
209 return 0;
210 if (pw->pw_uid == 0 && options.permit_root_login == 2)
211 return 0;
212 if (*password == '\0' && options.permit_empty_passwd == 0)
213 return 0;
214
Damien Miller646aa602001-02-15 11:51:32 +1100215 __pampasswd = password;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000216
Damien Miller9d5705a2000-09-16 16:09:27 +1100217 pamstate = INITIAL_LOGIN;
Damien Millerb8481582000-12-03 11:51:51 +1100218 pam_retval = do_pam_authenticate(0);
Damien Millere72b7af1999-12-30 15:08:44 +1100219 if (pam_retval == PAM_SUCCESS) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100220 debug("PAM Password authentication accepted for "
221 "user \"%.100s\"", pw->pw_name);
Damien Millere72b7af1999-12-30 15:08:44 +1100222 return 1;
223 } else {
Damien Miller63dc3e92001-02-07 12:58:33 +1100224 debug("PAM Password authentication for \"%.100s\" "
225 "failed[%d]: %s", pw->pw_name, pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100226 PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100227 return 0;
228 }
229}
230
231/* Do account management using PAM */
232int do_pam_account(char *username, char *remote_user)
233{
234 int pam_retval;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000235
Damien Miller646aa602001-02-15 11:51:32 +1100236 do_pam_set_conv(&conv);
Damien Miller63dc3e92001-02-07 12:58:33 +1100237
Damien Miller63dc3e92001-02-07 12:58:33 +1100238 if (remote_user) {
Damien Millere72b7af1999-12-30 15:08:44 +1100239 debug("PAM setting ruser to \"%.200s\"", remote_user);
Damien Miller646aa602001-02-15 11:51:32 +1100240 pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user);
Damien Miller63dc3e92001-02-07 12:58:33 +1100241 if (pam_retval != PAM_SUCCESS)
242 fatal("PAM set ruser failed[%d]: %.200s", pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100243 PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100244 }
245
Damien Miller646aa602001-02-15 11:51:32 +1100246 pam_retval = pam_acct_mgmt(__pamh, 0);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000247 switch (pam_retval) {
248 case PAM_SUCCESS:
249 /* This is what we want */
250 break;
251 case PAM_NEW_AUTHTOK_REQD:
Damien Miller646aa602001-02-15 11:51:32 +1100252 message_cat(&__pam_msg, NEW_AUTHTOK_MSG);
Damien Miller9d5705a2000-09-16 16:09:27 +1100253 /* flag that password change is necessary */
254 password_change_required = 1;
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000255 break;
256 default:
Damien Miller63dc3e92001-02-07 12:58:33 +1100257 log("PAM rejected by account configuration[%d]: "
Damien Miller646aa602001-02-15 11:51:32 +1100258 "%.200s", pam_retval, PAM_STRERROR(__pamh,
Damien Miller63dc3e92001-02-07 12:58:33 +1100259 pam_retval));
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000260 return(0);
Damien Millere72b7af1999-12-30 15:08:44 +1100261 }
Kevin Stevesef4eea92001-02-05 12:42:17 +0000262
Damien Millere72b7af1999-12-30 15:08:44 +1100263 return(1);
264}
265
266/* Do PAM-specific session initialisation */
Damien Miller3e955e72000-01-27 10:55:38 +1100267void do_pam_session(char *username, const char *ttyname)
Damien Millere72b7af1999-12-30 15:08:44 +1100268{
269 int pam_retval;
270
Damien Miller882c2ee2001-03-01 09:18:57 +1100271 do_pam_set_conv(&conv);
272
Damien Millere72b7af1999-12-30 15:08:44 +1100273 if (ttyname != NULL) {
274 debug("PAM setting tty to \"%.200s\"", ttyname);
Damien Miller646aa602001-02-15 11:51:32 +1100275 pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname);
Damien Miller63dc3e92001-02-07 12:58:33 +1100276 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000277 fatal("PAM set tty failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100278 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millere72b7af1999-12-30 15:08:44 +1100279 }
280
Damien Miller646aa602001-02-15 11:51:32 +1100281 pam_retval = pam_open_session(__pamh, 0);
Damien Miller63dc3e92001-02-07 12:58:33 +1100282 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000283 fatal("PAM session setup failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100284 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller31a501d2001-02-27 09:20:48 +1100285
Damien Miller3dfeee42001-02-14 00:43:55 +1100286 session_opened = 1;
Damien Millere72b7af1999-12-30 15:08:44 +1100287}
288
Kevin Stevesef4eea92001-02-05 12:42:17 +0000289/* Set PAM credentials */
Kevin Steves6beac8c2000-10-14 15:08:49 +0000290void do_pam_setcred(void)
Damien Millere72b7af1999-12-30 15:08:44 +1100291{
292 int pam_retval;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000293
Damien Miller882c2ee2001-03-01 09:18:57 +1100294 do_pam_set_conv(&conv);
295
Damien Millere72b7af1999-12-30 15:08:44 +1100296 debug("PAM establishing creds");
Damien Miller646aa602001-02-15 11:51:32 +1100297 pam_retval = pam_setcred(__pamh, PAM_ESTABLISH_CRED);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000298 if (pam_retval != PAM_SUCCESS) {
Damien Miller63dc3e92001-02-07 12:58:33 +1100299 if (was_authenticated)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000300 fatal("PAM setcred failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100301 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller63dc3e92001-02-07 12:58:33 +1100302 else
Kevin Stevesef4eea92001-02-05 12:42:17 +0000303 debug("PAM setcred failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100304 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller3dfeee42001-02-14 00:43:55 +1100305 } else
306 creds_set = 1;
Damien Miller9d5705a2000-09-16 16:09:27 +1100307}
308
Kevin Steves092f2ef2000-10-14 13:36:13 +0000309/* accessor function for file scope static variable */
Damien Miller646aa602001-02-15 11:51:32 +1100310int is_pam_password_change_required(void)
Kevin Steves092f2ef2000-10-14 13:36:13 +0000311{
312 return password_change_required;
313}
314
Kevin Stevesef4eea92001-02-05 12:42:17 +0000315/*
Damien Miller9d5705a2000-09-16 16:09:27 +1100316 * Have user change authentication token if pam_acct_mgmt() indicated
317 * it was expired. This needs to be called after an interactive
318 * session is established and the user's pty is connected to
319 * stdin/stout/stderr.
320 */
Kevin Steves6beac8c2000-10-14 15:08:49 +0000321void do_pam_chauthtok(void)
Damien Miller9d5705a2000-09-16 16:09:27 +1100322{
323 int pam_retval;
324
Damien Miller882c2ee2001-03-01 09:18:57 +1100325 do_pam_set_conv(&conv);
326
Damien Miller9d5705a2000-09-16 16:09:27 +1100327 if (password_change_required) {
328 pamstate = OTHER;
Damien Miller63dc3e92001-02-07 12:58:33 +1100329 /* XXX: should we really loop forever? */
Damien Miller9d5705a2000-09-16 16:09:27 +1100330 do {
Damien Miller646aa602001-02-15 11:51:32 +1100331 pam_retval = pam_chauthtok(__pamh,
Damien Miller63dc3e92001-02-07 12:58:33 +1100332 PAM_CHANGE_EXPIRED_AUTHTOK);
333 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000334 log("PAM pam_chauthtok failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100335 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller9d5705a2000-09-16 16:09:27 +1100336 } while (pam_retval != PAM_SUCCESS);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000337 }
Damien Millere72b7af1999-12-30 15:08:44 +1100338}
339
340/* Cleanly shutdown PAM */
341void finish_pam(void)
342{
Damien Miller646aa602001-02-15 11:51:32 +1100343 do_pam_cleanup_proc(NULL);
344 fatal_remove_cleanup(&do_pam_cleanup_proc, NULL);
Damien Millere72b7af1999-12-30 15:08:44 +1100345}
346
347/* Start PAM authentication for specified account */
Damien Miller22e22bf2001-01-19 15:46:38 +1100348void start_pam(const char *user)
Damien Millere72b7af1999-12-30 15:08:44 +1100349{
350 int pam_retval;
Damien Millerac2b1a52001-02-11 22:39:19 +1100351 extern ServerOptions options;
Damien Millere72b7af1999-12-30 15:08:44 +1100352
Damien Miller22e22bf2001-01-19 15:46:38 +1100353 debug("Starting up PAM with username \"%.200s\"", user);
Damien Millere72b7af1999-12-30 15:08:44 +1100354
Damien Miller646aa602001-02-15 11:51:32 +1100355 pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh);
Damien Millere72b7af1999-12-30 15:08:44 +1100356
Damien Miller63dc3e92001-02-07 12:58:33 +1100357 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000358 fatal("PAM initialisation failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100359 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Millerbd5817d2001-02-11 22:35:11 +1100360
361 debug("PAM setting rhost to \"%.200s\"",
362 get_canonical_hostname(options.reverse_mapping_check));
Damien Miller646aa602001-02-15 11:51:32 +1100363 pam_retval = pam_set_item(__pamh, PAM_RHOST,
Damien Millerbd5817d2001-02-11 22:35:11 +1100364 get_canonical_hostname(options.reverse_mapping_check));
365 if (pam_retval != PAM_SUCCESS)
366 fatal("PAM set rhost failed[%d]: %.200s", pam_retval,
Damien Miller646aa602001-02-15 11:51:32 +1100367 PAM_STRERROR(__pamh, pam_retval));
Damien Miller4e997202000-07-09 21:21:52 +1000368#ifdef PAM_TTY_KLUDGE
Damien Millerc19fd5f2000-06-22 21:44:54 +1000369 /*
370 * Some PAM modules (e.g. pam_time) require a TTY to operate,
Kevin Stevesef4eea92001-02-05 12:42:17 +0000371 * and will fail in various stupid ways if they don't get one.
Damien Millerc19fd5f2000-06-22 21:44:54 +1000372 * sshd doesn't set the tty until too late in the auth process and may
373 * not even need one (for tty-less connections)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000374 * Kludge: Set a fake PAM_TTY
Damien Millerc19fd5f2000-06-22 21:44:54 +1000375 */
Damien Miller646aa602001-02-15 11:51:32 +1100376 pam_retval = pam_set_item(__pamh, PAM_TTY, "ssh");
Damien Miller63dc3e92001-02-07 12:58:33 +1100377 if (pam_retval != PAM_SUCCESS)
Kevin Stevesef4eea92001-02-05 12:42:17 +0000378 fatal("PAM set tty failed[%d]: %.200s",
Damien Miller646aa602001-02-15 11:51:32 +1100379 pam_retval, PAM_STRERROR(__pamh, pam_retval));
Damien Miller4e997202000-07-09 21:21:52 +1000380#endif /* PAM_TTY_KLUDGE */
Damien Miller7b22d652000-06-18 14:07:04 +1000381
Damien Miller646aa602001-02-15 11:51:32 +1100382 fatal_add_cleanup(&do_pam_cleanup_proc, NULL);
Damien Millere72b7af1999-12-30 15:08:44 +1100383}
384
385/* Return list of PAM enviornment strings */
386char **fetch_pam_environment(void)
387{
Damien Miller1bead332000-04-30 00:47:29 +1000388#ifdef HAVE_PAM_GETENVLIST
Damien Miller646aa602001-02-15 11:51:32 +1100389 return(pam_getenvlist(__pamh));
Damien Miller1bead332000-04-30 00:47:29 +1000390#else /* HAVE_PAM_GETENVLIST */
391 return(NULL);
392#endif /* HAVE_PAM_GETENVLIST */
Damien Millere72b7af1999-12-30 15:08:44 +1100393}
394
395/* Print any messages that have been generated during authentication */
396/* or account checking to stderr */
397void print_pam_messages(void)
398{
Damien Miller646aa602001-02-15 11:51:32 +1100399 if (__pam_msg != NULL)
400 fputs(__pam_msg, stderr);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000401}
402
Damien Miller63dc3e92001-02-07 12:58:33 +1100403/* Append a message to buffer */
404void message_cat(char **p, const char *a)
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000405{
Damien Miller63dc3e92001-02-07 12:58:33 +1100406 char *cp;
407 size_t new_len;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000408
Damien Miller63dc3e92001-02-07 12:58:33 +1100409 new_len = strlen(a);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000410
Damien Miller63dc3e92001-02-07 12:58:33 +1100411 if (*p) {
412 size_t len = strlen(*p);
Damien Miller2f6a0ad2000-05-31 11:20:11 +1000413
Damien Miller63dc3e92001-02-07 12:58:33 +1100414 *p = xrealloc(*p, new_len + len + 2);
415 cp = *p + len;
416 } else
417 *p = cp = xmalloc(new_len + 2);
418
419 memcpy(cp, a, new_len);
420 cp[new_len] = '\n';
421 cp[new_len + 1] = '\0';
Damien Millere72b7af1999-12-30 15:08:44 +1100422}
423
424#endif /* USE_PAM */