2 * Copyright 1998 Juniper Networks, Inc.
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
7 * Portions of this software was developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 * products derived from this software without specific prior written
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $FreeBSD: src/lib/libpam/modules/pam_unix/pam_unix.c,v 1.53 2007/12/21 12:00:16 des Exp $
37 * $DragonFly: src/lib/pam_module/pam_unix/pam_unix.c,v 1.1 2005/08/01 16:15:19 joerg Exp $
40 #include <sys/param.h>
41 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
46 #include <login_cap.h>
62 #define PAM_SM_ACCOUNT
63 #define PAM_SM_PASSWORD
65 #include <security/pam_appl.h>
66 #include <security/pam_modules.h>
67 #include <security/pam_mod_misc.h>
69 #define PASSWORD_HASH "md5"
70 #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
73 #define LOCKED_PREFIX "*LOCKED*"
74 #define LOCKED_PREFIX_LEN (sizeof(LOCKED_PREFIX) - 1)
76 static void makesalt(char []);
78 static char password_hash
[] = PASSWORD_HASH
;
80 #define PAM_OPT_LOCAL_PASS "local_pass"
81 #define PAM_OPT_NIS_PASS "nis_pass"
83 char *tempname
= NULL
;
86 * authentication management
89 pam_sm_authenticate(pam_handle_t
*pamh
, int flags __unused
,
90 int argc __unused
, const char *argv
[] __unused
)
95 const char *pass
, *user
, *realpw
, *prompt
;
97 if (openpam_get_option(pamh
, PAM_OPT_AUTH_AS_SELF
)) {
98 pwd
= getpwnam(getlogin());
100 retval
= pam_get_user(pamh
, &user
, NULL
);
101 if (retval
!= PAM_SUCCESS
)
103 pwd
= getpwnam(user
);
106 PAM_LOG("Got user: %s", user
);
109 PAM_LOG("Doing real authentication");
110 realpw
= pwd
->pw_passwd
;
111 if (realpw
[0] == '\0') {
112 if (!(flags
& PAM_DISALLOW_NULL_AUTHTOK
) &&
113 openpam_get_option(pamh
, PAM_OPT_NULLOK
))
114 return (PAM_SUCCESS
);
117 lc
= login_getpwclass(pwd
);
119 PAM_LOG("Doing dummy authentication");
121 lc
= login_getclass(NULL
);
123 prompt
= login_getcapstr(lc
, "passwd_prompt", NULL
, NULL
);
124 retval
= pam_get_authtok(pamh
, PAM_AUTHTOK
, &pass
, prompt
);
126 if (retval
!= PAM_SUCCESS
)
128 PAM_LOG("Got password");
129 if (strcmp(crypt(pass
, realpw
), realpw
) == 0)
130 return (PAM_SUCCESS
);
132 PAM_VERBOSE_ERROR("UNIX authentication refused");
133 return (PAM_AUTH_ERR
);
137 pam_sm_setcred(pam_handle_t
*pamh __unused
, int flags __unused
,
138 int argc __unused
, const char *argv
[] __unused
)
141 return (PAM_SUCCESS
);
148 pam_sm_acct_mgmt(pam_handle_t
*pamh
, int flags __unused
,
149 int argc __unused
, const char *argv
[] __unused
)
151 struct addrinfo hints
, *res
;
158 const void *rhost
, *tty
;
159 char rhostip
[MAXHOSTNAMELEN
] = "";
161 retval
= pam_get_user(pamh
, &user
, NULL
);
162 if (retval
!= PAM_SUCCESS
)
165 if (user
== NULL
|| (pwd
= getpwnam(user
)) == NULL
)
166 return (PAM_SERVICE_ERR
);
168 PAM_LOG("Got user: %s", user
);
170 retval
= pam_get_item(pamh
, PAM_RHOST
, &rhost
);
171 if (retval
!= PAM_SUCCESS
)
174 retval
= pam_get_item(pamh
, PAM_TTY
, &tty
);
175 if (retval
!= PAM_SUCCESS
)
178 if (*pwd
->pw_passwd
== '\0' &&
179 (flags
& PAM_DISALLOW_NULL_AUTHTOK
) != 0)
180 return (PAM_NEW_AUTHTOK_REQD
);
182 if (strncmp(pwd
->pw_passwd
, LOCKED_PREFIX
, LOCKED_PREFIX_LEN
) == 0)
183 return (PAM_AUTH_ERR
);
185 lc
= login_getpwclass(pwd
);
187 PAM_LOG("Unable to get login class for user %s", user
);
188 return (PAM_SERVICE_ERR
);
191 PAM_LOG("Got login_cap");
193 if (pwd
->pw_change
|| pwd
->pw_expire
)
194 gettimeofday(&tp
, NULL
);
197 * Check pw_expire before pw_change - no point in letting the
198 * user change the password on an expired account.
201 if (pwd
->pw_expire
) {
202 warntime
= login_getcaptime(lc
, "warnexpire",
203 DEFAULT_WARN
, DEFAULT_WARN
);
204 if (tp
.tv_sec
>= pwd
->pw_expire
) {
206 return (PAM_ACCT_EXPIRED
);
207 } else if (pwd
->pw_expire
- tp
.tv_sec
< warntime
&&
208 (flags
& PAM_SILENT
) == 0) {
209 pam_error(pamh
, "Warning: your account expires on %s",
210 ctime(&pwd
->pw_expire
));
214 retval
= PAM_SUCCESS
;
215 if (pwd
->pw_change
) {
216 warntime
= login_getcaptime(lc
, "warnpassword",
217 DEFAULT_WARN
, DEFAULT_WARN
);
218 if (tp
.tv_sec
>= pwd
->pw_change
) {
219 retval
= PAM_NEW_AUTHTOK_REQD
;
220 } else if (pwd
->pw_change
- tp
.tv_sec
< warntime
&&
221 (flags
& PAM_SILENT
) == 0) {
222 pam_error(pamh
, "Warning: your password expires on %s",
223 ctime(&pwd
->pw_change
));
228 * From here on, we must leave retval untouched (unless we
229 * know we're going to fail), because we need to remember
230 * whether we're supposed to return PAM_SUCCESS or
231 * PAM_NEW_AUTHTOK_REQD.
234 if (rhost
&& *(const char *)rhost
!= '\0') {
235 memset(&hints
, 0, sizeof(hints
));
236 hints
.ai_family
= AF_UNSPEC
;
237 if (getaddrinfo(rhost
, NULL
, &hints
, &res
) == 0) {
238 getnameinfo(res
->ai_addr
, res
->ai_addrlen
,
239 rhostip
, sizeof(rhostip
), NULL
, 0,
247 * Check host / tty / time-of-day restrictions
250 if (!auth_hostok(lc
, rhost
, rhostip
) ||
251 !auth_ttyok(lc
, tty
) ||
252 !auth_timeok(lc
, time(NULL
)))
253 retval
= PAM_AUTH_ERR
;
261 * password management
263 * standard Unix and NIS password changing
266 pam_sm_chauthtok(pam_handle_t
*pamh
, int flags
,
267 int argc __unused
, const char *argv
[] __unused
)
270 struct ypclnt
*ypclnt
;
271 const void *yp_domain
, *yp_server
;
273 char salt
[SALTSIZE
+ 1];
275 struct passwd
*pwd
, *old_pwd
;
276 const char *user
, *old_pass
, *new_pass
;
278 int pfd
, tfd
, retval
;
280 if (openpam_get_option(pamh
, PAM_OPT_AUTH_AS_SELF
))
281 pwd
= getpwnam(getlogin());
283 retval
= pam_get_user(pamh
, &user
, NULL
);
284 if (retval
!= PAM_SUCCESS
)
286 pwd
= getpwnam(user
);
290 return (PAM_AUTHTOK_RECOVERY_ERR
);
292 PAM_LOG("Got user: %s", user
);
294 if (flags
& PAM_PRELIM_CHECK
) {
296 PAM_LOG("PRELIM round");
299 (pwd
->pw_fields
& _PWF_SOURCE
) == _PWF_FILES
)
300 /* root doesn't need the old password */
301 return (pam_set_item(pamh
, PAM_OLDAUTHTOK
, ""));
304 (pwd
->pw_fields
& _PWF_SOURCE
) == _PWF_NIS
) {
306 yp_domain
= yp_server
= NULL
;
307 pam_get_data(pamh
, "yp_domain", &yp_domain
);
308 pam_get_data(pamh
, "yp_server", &yp_server
);
310 ypclnt
= ypclnt_new(yp_domain
, "passwd.byname", yp_server
);
312 return (PAM_BUF_ERR
);
314 if (ypclnt_connect(ypclnt
) == -1) {
316 return (PAM_SERVICE_ERR
);
319 retval
= ypclnt_havepasswdd(ypclnt
);
322 return (pam_set_item(pamh
, PAM_OLDAUTHTOK
, ""));
323 else if (retval
== -1)
324 return (PAM_SERVICE_ERR
);
327 if (pwd
->pw_passwd
[0] == '\0'
328 && openpam_get_option(pamh
, PAM_OPT_NULLOK
)) {
330 * No password case. XXX Are we giving too much away
331 * by not prompting for a password?
332 * XXX check PAM_DISALLOW_NULL_AUTHTOK
336 retval
= pam_get_authtok(pamh
,
337 PAM_OLDAUTHTOK
, &old_pass
, NULL
);
338 if (retval
!= PAM_SUCCESS
)
341 PAM_LOG("Got old password");
342 /* always encrypt first */
343 encrypted
= crypt(old_pass
, pwd
->pw_passwd
);
344 if (old_pass
[0] == '\0' &&
345 !openpam_get_option(pamh
, PAM_OPT_NULLOK
))
346 return (PAM_PERM_DENIED
);
347 if (strcmp(encrypted
, pwd
->pw_passwd
) != 0)
348 return (PAM_PERM_DENIED
);
350 else if (flags
& PAM_UPDATE_AUTHTOK
) {
351 PAM_LOG("UPDATE round");
353 retval
= pam_get_authtok(pamh
,
354 PAM_OLDAUTHTOK
, &old_pass
, NULL
);
355 if (retval
!= PAM_SUCCESS
)
357 PAM_LOG("Got old password");
359 /* get new password */
361 retval
= pam_get_authtok(pamh
,
362 PAM_AUTHTOK
, &new_pass
, NULL
);
363 if (retval
!= PAM_TRY_AGAIN
)
365 pam_error(pamh
, "Mismatch; try again, EOF to quit.");
367 PAM_LOG("Got new password");
368 if (retval
!= PAM_SUCCESS
) {
369 PAM_VERBOSE_ERROR("Unable to get new password");
373 if (getuid() != 0 && new_pass
[0] == '\0' &&
374 !openpam_get_option(pamh
, PAM_OPT_NULLOK
))
375 return (PAM_PERM_DENIED
);
377 if ((old_pwd
= pw_dup(pwd
)) == NULL
)
378 return (PAM_BUF_ERR
);
381 lc
= login_getclass(pwd
->pw_class
);
382 if (login_setcryptfmt(lc
, password_hash
, NULL
) == NULL
)
383 openpam_log(PAM_LOG_ERROR
,
384 "can't set password cipher, relying on default");
387 pwd
->pw_passwd
= crypt(new_pass
, salt
);
389 switch (old_pwd
->pw_fields
& _PWF_SOURCE
) {
392 retval
= PAM_SERVICE_ERR
;
393 if (pw_init(NULL
, NULL
))
394 openpam_log(PAM_LOG_ERROR
, "pw_init() failed");
395 else if ((pfd
= pw_lock()) == -1)
396 openpam_log(PAM_LOG_ERROR
, "pw_lock() failed");
397 else if ((tfd
= pw_tmp(-1)) == -1)
398 openpam_log(PAM_LOG_ERROR
, "pw_tmp() failed");
399 else if (pw_copy(pfd
, tfd
, pwd
, old_pwd
) == -1)
400 openpam_log(PAM_LOG_ERROR
, "pw_copy() failed");
401 else if (pw_mkdb(pwd
->pw_name
) == -1)
402 openpam_log(PAM_LOG_ERROR
, "pw_mkdb() failed");
404 retval
= PAM_SUCCESS
;
409 yp_domain
= yp_server
= NULL
;
410 pam_get_data(pamh
, "yp_domain", &yp_domain
);
411 pam_get_data(pamh
, "yp_server", &yp_server
);
412 ypclnt
= ypclnt_new(yp_domain
,
413 "passwd.byname", yp_server
);
414 if (ypclnt
== NULL
) {
415 retval
= PAM_BUF_ERR
;
416 } else if (ypclnt_connect(ypclnt
) == -1 ||
417 ypclnt_passwd(ypclnt
, pwd
, old_pass
) == -1) {
418 openpam_log(PAM_LOG_ERROR
, "%s", ypclnt
->error
);
419 retval
= PAM_SERVICE_ERR
;
421 retval
= PAM_SUCCESS
;
426 openpam_log(PAM_LOG_ERROR
, "unsupported source 0x%x",
427 pwd
->pw_fields
& _PWF_SOURCE
);
428 retval
= PAM_SERVICE_ERR
;
436 PAM_LOG("Illegal 'flags'");
442 /* Mostly stolen from passwd(1)'s local_passwd.c - markm */
444 static unsigned char itoa64
[] = /* 0 ... 63 => ascii - 64 */
445 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
448 to64(char *s
, long v
, int n
)
451 *s
++ = itoa64
[v
&0x3f];
456 /* Salt suitable for traditional DES and MD5 */
458 makesalt(char salt
[SALTSIZE
])
462 /* These are not really random numbers, they are just
463 * numbers that change to thwart construction of a
464 * dictionary. This is exposed to the public.
466 for (i
= 0; i
< SALTSIZE
; i
+= 4)
467 to64(&salt
[i
], arc4random(), 4);
468 salt
[SALTSIZE
] = '\0';
471 PAM_MODULE_ENTRY("pam_unix");