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1/*
2 * 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.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Markus Friedl.
15 * 4. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "includes.h"
31
32#ifdef USE_PAM
33#include "ssh.h"
34#include "xmalloc.h"
35#include "servconf.h"
36
37RCSID("$Id: auth-pam.c,v 1.11 2000/07/09 12:42:33 djm Exp $");
38
39#define NEW_AUTHTOK_MSG \
40 "Warning: You password has expired, please change it now"
41
42/* Callbacks */
43static int pamconv(int num_msg, const struct pam_message **msg,
44 struct pam_response **resp, void *appdata_ptr);
45void pam_cleanup_proc(void *context);
46void pam_msg_cat(const char *msg);
47
48/* module-local variables */
49static struct pam_conv conv = {
50 pamconv,
51 NULL
52};
53static struct pam_handle_t *pamh = NULL;
54static const char *pampasswd = NULL;
55static char *pam_msg = NULL;
56
57/* PAM conversation function. This is really a kludge to get the password */
58/* into PAM and to pick up any messages generated by PAM into pamconv_msg */
59static int pamconv(int num_msg, const struct pam_message **msg,
60 struct pam_response **resp, void *appdata_ptr)
61{
62 struct pam_response *reply;
63 int count;
64
65 /* PAM will free this later */
66 reply = malloc(num_msg * sizeof(*reply));
67 if (reply == NULL)
68 return PAM_CONV_ERR;
69
70 for(count = 0; count < num_msg; count++) {
71 switch (msg[count]->msg_style) {
72 case PAM_PROMPT_ECHO_OFF:
73 if (pampasswd == NULL) {
74 free(reply);
75 return PAM_CONV_ERR;
76 }
77 reply[count].resp_retcode = PAM_SUCCESS;
78 reply[count].resp = xstrdup(pampasswd);
79 break;
80 case PAM_TEXT_INFO:
81 reply[count].resp_retcode = PAM_SUCCESS;
82 reply[count].resp = xstrdup("");
83
84 if (msg[count]->msg != NULL)
85 pam_msg_cat(msg[count]->msg);
86
87 break;
88 default:
89 free(reply);
90 return PAM_CONV_ERR;
91 }
92 }
93
94 *resp = reply;
95
96 return PAM_SUCCESS;
97}
98
99/* Called at exit to cleanly shutdown PAM */
100void pam_cleanup_proc(void *context)
101{
102 int pam_retval;
103
104 if (pamh != NULL)
105 {
106 pam_retval = pam_close_session((pam_handle_t *)pamh, 0);
107 if (pam_retval != PAM_SUCCESS) {
108 log("Cannot close PAM session: %.200s",
109 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
110 }
111
112 pam_retval = pam_setcred((pam_handle_t *)pamh, PAM_DELETE_CRED);
113 if (pam_retval != PAM_SUCCESS) {
114 log("Cannot delete credentials: %.200s",
115 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
116 }
117
118 pam_retval = pam_end((pam_handle_t *)pamh, pam_retval);
119 if (pam_retval != PAM_SUCCESS) {
120 log("Cannot release PAM authentication: %.200s",
121 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
122 }
123 }
124}
125
126/* Attempt password authentation using PAM */
127int auth_pam_password(struct passwd *pw, const char *password)
128{
129 extern ServerOptions options;
130 int pam_retval;
131
132 /* deny if no user. */
133 if (pw == NULL)
134 return 0;
135 if (pw->pw_uid == 0 && options.permit_root_login == 2)
136 return 0;
137 if (*password == '\0' && options.permit_empty_passwd == 0)
138 return 0;
139
140 pampasswd = password;
141
142 pam_retval = pam_authenticate((pam_handle_t *)pamh, 0);
143 if (pam_retval == PAM_SUCCESS) {
144 debug("PAM Password authentication accepted for user \"%.100s\"",
145 pw->pw_name);
146 return 1;
147 } else {
148 debug("PAM Password authentication for \"%.100s\" failed: %s",
149 pw->pw_name, PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
150 return 0;
151 }
152}
153
154/* Do account management using PAM */
155int do_pam_account(char *username, char *remote_user)
156{
157 int pam_retval;
158
159 debug("PAM setting rhost to \"%.200s\"", get_canonical_hostname());
160 pam_retval = pam_set_item((pam_handle_t *)pamh, PAM_RHOST,
161 get_canonical_hostname());
162 if (pam_retval != PAM_SUCCESS) {
163 fatal("PAM set rhost failed: %.200s",
164 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
165 }
166
167 if (remote_user != NULL) {
168 debug("PAM setting ruser to \"%.200s\"", remote_user);
169 pam_retval = pam_set_item((pam_handle_t *)pamh, PAM_RUSER, remote_user);
170 if (pam_retval != PAM_SUCCESS) {
171 fatal("PAM set ruser failed: %.200s",
172 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
173 }
174 }
175
176 pam_retval = pam_acct_mgmt((pam_handle_t *)pamh, 0);
177 switch (pam_retval) {
178 case PAM_SUCCESS:
179 /* This is what we want */
180 break;
181 case PAM_NEW_AUTHTOK_REQD:
182 pam_msg_cat(NEW_AUTHTOK_MSG);
183 break;
184 default:
185 log("PAM rejected by account configuration: %.200s",
186 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
187 return(0);
188 }
189
190 return(1);
191}
192
193/* Do PAM-specific session initialisation */
194void do_pam_session(char *username, const char *ttyname)
195{
196 int pam_retval;
197
198 if (ttyname != NULL) {
199 debug("PAM setting tty to \"%.200s\"", ttyname);
200 pam_retval = pam_set_item((pam_handle_t *)pamh, PAM_TTY, ttyname);
201 if (pam_retval != PAM_SUCCESS) {
202 fatal("PAM set tty failed: %.200s",
203 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
204 }
205 }
206
207 pam_retval = pam_open_session((pam_handle_t *)pamh, 0);
208 if (pam_retval != PAM_SUCCESS) {
209 fatal("PAM session setup failed: %.200s",
210 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
211 }
212}
213
214/* Set PAM credentials */
215void do_pam_setcred()
216{
217 int pam_retval;
218
219 debug("PAM establishing creds");
220 pam_retval = pam_setcred((pam_handle_t *)pamh, PAM_ESTABLISH_CRED);
221 if (pam_retval != PAM_SUCCESS) {
222 fatal("PAM setcred failed: %.200s",
223 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
224 }
225}
226
227/* Cleanly shutdown PAM */
228void finish_pam(void)
229{
230 pam_cleanup_proc(NULL);
231 fatal_remove_cleanup(&pam_cleanup_proc, NULL);
232}
233
234/* Start PAM authentication for specified account */
235void start_pam(struct passwd *pw)
236{
237 int pam_retval;
238
239 debug("Starting up PAM with username \"%.200s\"", pw->pw_name);
240
241 pam_retval = pam_start(SSHD_PAM_SERVICE, pw->pw_name, &conv,
242 (pam_handle_t**)&pamh);
243
244 if (pam_retval != PAM_SUCCESS) {
245 fatal("PAM initialisation failed: %.200s",
246 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
247 }
248
249#ifdef PAM_TTY_KLUDGE
250 /*
251 * Some PAM modules (e.g. pam_time) require a TTY to operate,
252 * and will fail in various stupid ways if they don't get one.
253 * sshd doesn't set the tty until too late in the auth process and may
254 * not even need one (for tty-less connections)
255 * Kludge: Set a fake PAM_TTY
256 */
257 pam_retval = pam_set_item((pam_handle_t *)pamh, PAM_TTY, "ssh");
258 if (pam_retval != PAM_SUCCESS) {
259 fatal("PAM set tty failed: %.200s",
260 PAM_STRERROR((pam_handle_t *)pamh, pam_retval));
261 }
262#endif /* PAM_TTY_KLUDGE */
263
264 fatal_add_cleanup(&pam_cleanup_proc, NULL);
265}
266
267/* Return list of PAM enviornment strings */
268char **fetch_pam_environment(void)
269{
270#ifdef HAVE_PAM_GETENVLIST
271 return(pam_getenvlist((pam_handle_t *)pamh));
272#else /* HAVE_PAM_GETENVLIST */
273 return(NULL);
274#endif /* HAVE_PAM_GETENVLIST */
275}
276
277/* Print any messages that have been generated during authentication */
278/* or account checking to stderr */
279void print_pam_messages(void)
280{
281 if (pam_msg != NULL)
282 fputs(pam_msg, stderr);
283}
284
285/* Append a message to the PAM message buffer */
286void pam_msg_cat(const char *msg)
287{
288 char *p;
289 size_t new_msg_len;
290 size_t pam_msg_len;
291
292 new_msg_len = strlen(msg);
293
294 if (pam_msg) {
295 pam_msg_len = strlen(pam_msg);
296 pam_msg = xrealloc(pam_msg, new_msg_len + pam_msg_len + 2);
297 p = pam_msg + pam_msg_len;
298 } else {
299 pam_msg = p = xmalloc(new_msg_len + 2);
300 }
301
302 memcpy(p, msg, new_msg_len);
303 p[new_msg_len] = '\n';
304 p[new_msg_len + 1] = '\0';
305}
306
307#endif /* USE_PAM */