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 "sha256"
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");