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 1.56 2011/11/05 10:00:29 ed Exp $
39 #include <sys/param.h>
40 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
45 #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 "sha512"
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"
84 * authentication management
87 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
88 int argc __unused, const char *argv[] __unused)
93 const char *pass, *user, *realpw, *prompt;
95 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
96 pwd = getpwnam(getlogin());
98 retval = pam_get_user(pamh, &user, NULL);
99 if (retval != PAM_SUCCESS)
101 pwd = getpwnam(user);
104 PAM_LOG("Got user: %s", user);
107 PAM_LOG("Doing real authentication");
108 realpw = pwd->pw_passwd;
109 if (realpw[0] == '\0') {
110 if (!(flags & PAM_DISALLOW_NULL_AUTHTOK) &&
111 openpam_get_option(pamh, PAM_OPT_NULLOK))
112 return (PAM_SUCCESS);
115 lc = login_getpwclass(pwd);
117 PAM_LOG("Doing dummy authentication");
119 lc = login_getclass(NULL);
121 prompt = login_getcapstr(lc, "passwd_prompt", NULL, NULL);
122 retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
124 if (retval != PAM_SUCCESS)
126 PAM_LOG("Got password");
127 if (strcmp(crypt(pass, realpw), realpw) == 0)
128 return (PAM_SUCCESS);
130 PAM_VERBOSE_ERROR("UNIX authentication refused");
131 return (PAM_AUTH_ERR);
135 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
136 int argc __unused, const char *argv[] __unused)
139 return (PAM_SUCCESS);
146 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
147 int argc __unused, const char *argv[] __unused)
149 struct addrinfo hints, *res;
156 const void *rhost, *tty;
157 char rhostip[MAXHOSTNAMELEN] = "";
159 retval = pam_get_user(pamh, &user, NULL);
160 if (retval != PAM_SUCCESS)
163 if (user == NULL || (pwd = getpwnam(user)) == NULL)
164 return (PAM_SERVICE_ERR);
166 PAM_LOG("Got user: %s", user);
168 retval = pam_get_item(pamh, PAM_RHOST, &rhost);
169 if (retval != PAM_SUCCESS)
172 retval = pam_get_item(pamh, PAM_TTY, &tty);
173 if (retval != PAM_SUCCESS)
176 if (*pwd->pw_passwd == '\0' &&
177 (flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
178 return (PAM_NEW_AUTHTOK_REQD);
180 if (strncmp(pwd->pw_passwd, LOCKED_PREFIX, LOCKED_PREFIX_LEN) == 0)
181 return (PAM_AUTH_ERR);
183 lc = login_getpwclass(pwd);
185 PAM_LOG("Unable to get login class for user %s", user);
186 return (PAM_SERVICE_ERR);
189 PAM_LOG("Got login_cap");
191 if (pwd->pw_change || pwd->pw_expire)
192 gettimeofday(&tp, NULL);
195 * Check pw_expire before pw_change - no point in letting the
196 * user change the password on an expired account.
199 if (pwd->pw_expire) {
200 warntime = login_getcaptime(lc, "warnexpire",
201 DEFAULT_WARN, DEFAULT_WARN);
202 if (tp.tv_sec >= pwd->pw_expire) {
204 return (PAM_ACCT_EXPIRED);
205 } else if (pwd->pw_expire - tp.tv_sec < warntime &&
206 (flags & PAM_SILENT) == 0) {
207 pam_error(pamh, "Warning: your account expires on %s",
208 ctime(&pwd->pw_expire));
212 retval = PAM_SUCCESS;
213 if (pwd->pw_change) {
214 warntime = login_getcaptime(lc, "warnpassword",
215 DEFAULT_WARN, DEFAULT_WARN);
216 if (tp.tv_sec >= pwd->pw_change) {
217 retval = PAM_NEW_AUTHTOK_REQD;
218 } else if (pwd->pw_change - tp.tv_sec < warntime &&
219 (flags & PAM_SILENT) == 0) {
220 pam_error(pamh, "Warning: your password expires on %s",
221 ctime(&pwd->pw_change));
226 * From here on, we must leave retval untouched (unless we
227 * know we're going to fail), because we need to remember
228 * whether we're supposed to return PAM_SUCCESS or
229 * PAM_NEW_AUTHTOK_REQD.
232 if (rhost && *(const char *)rhost != '\0') {
233 memset(&hints, 0, sizeof(hints));
234 hints.ai_family = AF_UNSPEC;
235 if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
236 getnameinfo(res->ai_addr, res->ai_addrlen,
237 rhostip, sizeof(rhostip), NULL, 0,
245 * Check host / tty / time-of-day restrictions
248 if (!auth_hostok(lc, rhost, rhostip) ||
249 !auth_ttyok(lc, tty) ||
250 !auth_timeok(lc, time(NULL)))
251 retval = PAM_AUTH_ERR;
259 * password management
261 * standard Unix and NIS password changing
264 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
265 int argc __unused, const char *argv[] __unused)
268 struct ypclnt *ypclnt;
269 const void *yp_domain, *yp_server;
271 char salt[SALTSIZE + 1];
273 struct passwd *pwd, *old_pwd;
274 const char *user, *old_pass, *new_pass;
277 int pfd, tfd, retval;
279 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF))
280 pwd = getpwnam(getlogin());
282 retval = pam_get_user(pamh, &user, NULL);
283 if (retval != PAM_SUCCESS)
285 pwd = getpwnam(user);
289 return (PAM_AUTHTOK_RECOVERY_ERR);
291 PAM_LOG("Got user: %s", user);
293 if (flags & PAM_PRELIM_CHECK) {
295 PAM_LOG("PRELIM round");
298 (pwd->pw_fields & _PWF_SOURCE) == _PWF_FILES)
299 /* root doesn't need the old password */
300 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
303 (pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
305 yp_domain = yp_server = NULL;
306 pam_get_data(pamh, "yp_domain", &yp_domain);
307 pam_get_data(pamh, "yp_server", &yp_server);
309 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_server);
311 return (PAM_BUF_ERR);
313 if (ypclnt_connect(ypclnt) == -1) {
315 return (PAM_SERVICE_ERR);
318 retval = ypclnt_havepasswdd(ypclnt);
321 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
322 else if (retval == -1)
323 return (PAM_SERVICE_ERR);
326 if (pwd->pw_passwd[0] == '\0'
327 && openpam_get_option(pamh, PAM_OPT_NULLOK)) {
329 * No password case. XXX Are we giving too much away
330 * by not prompting for a password?
331 * XXX check PAM_DISALLOW_NULL_AUTHTOK
335 retval = pam_get_authtok(pamh,
336 PAM_OLDAUTHTOK, &old_pass, NULL);
337 if (retval != PAM_SUCCESS)
340 PAM_LOG("Got old password");
341 /* always encrypt first */
342 encrypted = crypt(old_pass, pwd->pw_passwd);
343 if (old_pass[0] == '\0' &&
344 !openpam_get_option(pamh, PAM_OPT_NULLOK))
345 return (PAM_PERM_DENIED);
346 if (strcmp(encrypted, pwd->pw_passwd) != 0)
347 return (PAM_PERM_DENIED);
349 else if (flags & PAM_UPDATE_AUTHTOK) {
350 PAM_LOG("UPDATE round");
352 retval = pam_get_authtok(pamh,
353 PAM_OLDAUTHTOK, &old_pass, NULL);
354 if (retval != PAM_SUCCESS)
356 PAM_LOG("Got old password");
358 /* get new password */
360 retval = pam_get_authtok(pamh,
361 PAM_AUTHTOK, &new_pass, NULL);
362 if (retval != PAM_TRY_AGAIN)
364 pam_error(pamh, "Mismatch; try again, EOF to quit.");
366 PAM_LOG("Got new password");
367 if (retval != PAM_SUCCESS) {
368 PAM_VERBOSE_ERROR("Unable to get new password");
372 if (getuid() != 0 && new_pass[0] == '\0' &&
373 !openpam_get_option(pamh, PAM_OPT_NULLOK))
374 return (PAM_PERM_DENIED);
376 if ((old_pwd = pw_dup(pwd)) == NULL)
377 return (PAM_BUF_ERR);
379 lc = login_getclass(pwd->pw_class);
380 if (login_setcryptfmt(lc, password_hash, NULL) == NULL)
381 openpam_log(PAM_LOG_ERROR,
382 "can't set password cipher, relying on default");
384 /* set password expiry date */
386 passwordtime = login_getcaptime(lc, "passwordtime", 0, 0);
387 if (passwordtime > 0)
388 pwd->pw_change = time(NULL) + passwordtime;
392 pwd->pw_passwd = crypt(new_pass, salt);
394 switch (old_pwd->pw_fields & _PWF_SOURCE) {
397 retval = PAM_SERVICE_ERR;
398 if (pw_init(NULL, NULL))
399 openpam_log(PAM_LOG_ERROR, "pw_init() failed");
400 else if ((pfd = pw_lock()) == -1)
401 openpam_log(PAM_LOG_ERROR, "pw_lock() failed");
402 else if ((tfd = pw_tmp(-1)) == -1)
403 openpam_log(PAM_LOG_ERROR, "pw_tmp() failed");
404 else if (pw_copy(pfd, tfd, pwd, old_pwd) == -1)
405 openpam_log(PAM_LOG_ERROR, "pw_copy() failed");
406 else if (pw_mkdb(pwd->pw_name) == -1)
407 openpam_log(PAM_LOG_ERROR, "pw_mkdb() failed");
409 retval = PAM_SUCCESS;
414 yp_domain = yp_server = NULL;
415 pam_get_data(pamh, "yp_domain", &yp_domain);
416 pam_get_data(pamh, "yp_server", &yp_server);
417 ypclnt = ypclnt_new(yp_domain,
418 "passwd.byname", yp_server);
419 if (ypclnt == NULL) {
420 retval = PAM_BUF_ERR;
421 } else if (ypclnt_connect(ypclnt) == -1 ||
422 ypclnt_passwd(ypclnt, pwd, old_pass) == -1) {
423 openpam_log(PAM_LOG_ERROR, "%s", ypclnt->error);
424 retval = PAM_SERVICE_ERR;
426 retval = PAM_SUCCESS;
431 openpam_log(PAM_LOG_ERROR, "unsupported source 0x%x",
432 pwd->pw_fields & _PWF_SOURCE);
433 retval = PAM_SERVICE_ERR;
441 PAM_LOG("Illegal 'flags'");
447 /* Mostly stolen from passwd(1)'s local_passwd.c - markm */
449 static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
450 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
453 to64(char *s, long v, int n)
456 *s++ = itoa64[v&0x3f];
461 /* Salt suitable for traditional DES and MD5 */
463 makesalt(char salt[SALTSIZE])
467 /* These are not really random numbers, they are just
468 * numbers that change to thwart construction of a
469 * dictionary. This is exposed to the public.
471 for (i = 0; i < SALTSIZE; i += 4)
472 to64(&salt[i], arc4random(), 4);
473 salt[SALTSIZE] = '\0';
476 PAM_MODULE_ENTRY("pam_unix");