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
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
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>
63 #define PAM_SM_ACCOUNT
64 #define PAM_SM_PASSWORD
66 #include <security/pam_appl.h>
67 #include <security/pam_modules.h>
68 #include <security/pam_mod_misc.h>
70 #define PASSWORD_HASH "md5"
71 #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
74 #define LOCKED_PREFIX "*LOCKED*"
75 #define LOCKED_PREFIX_LEN (sizeof(LOCKED_PREFIX) - 1)
77 static void makesalt(char []);
79 static char password_hash[] = PASSWORD_HASH;
81 #define PAM_OPT_LOCAL_PASS "local_pass"
82 #define PAM_OPT_NIS_PASS "nis_pass"
84 char *tempname = NULL;
87 * authentication management
90 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
91 int argc __unused, const char *argv[] __unused)
96 const char *pass, *user, *realpw, *prompt;
98 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
99 pwd = getpwnam(getlogin());
101 retval = pam_get_user(pamh, &user, NULL);
102 if (retval != PAM_SUCCESS)
104 pwd = getpwnam(user);
107 PAM_LOG("Got user: %s", user);
110 PAM_LOG("Doing real authentication");
111 realpw = pwd->pw_passwd;
112 if (realpw[0] == '\0') {
113 if (!(flags & PAM_DISALLOW_NULL_AUTHTOK) &&
114 openpam_get_option(pamh, PAM_OPT_NULLOK))
115 return (PAM_SUCCESS);
118 lc = login_getpwclass(pwd);
120 PAM_LOG("Doing dummy authentication");
122 lc = login_getclass(NULL);
124 prompt = login_getcapstr(lc, "passwd_prompt", NULL, NULL);
125 retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
127 if (retval != PAM_SUCCESS)
129 PAM_LOG("Got password");
130 if (strcmp(crypt(pass, realpw), realpw) == 0)
131 return (PAM_SUCCESS);
133 PAM_VERBOSE_ERROR("UNIX authentication refused");
134 return (PAM_AUTH_ERR);
138 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
139 int argc __unused, const char *argv[] __unused)
142 return (PAM_SUCCESS);
149 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
150 int argc __unused, const char *argv[] __unused)
152 struct addrinfo hints, *res;
159 const void *rhost, *tty;
160 char rhostip[MAXHOSTNAMELEN] = "";
162 retval = pam_get_user(pamh, &user, NULL);
163 if (retval != PAM_SUCCESS)
166 if (user == NULL || (pwd = getpwnam(user)) == NULL)
167 return (PAM_SERVICE_ERR);
169 PAM_LOG("Got user: %s", user);
171 retval = pam_get_item(pamh, PAM_RHOST, &rhost);
172 if (retval != PAM_SUCCESS)
175 retval = pam_get_item(pamh, PAM_TTY, &tty);
176 if (retval != PAM_SUCCESS)
179 if (*pwd->pw_passwd == '\0' &&
180 (flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
181 return (PAM_NEW_AUTHTOK_REQD);
183 if (strncmp(pwd->pw_passwd, LOCKED_PREFIX, LOCKED_PREFIX_LEN) == 0)
184 return (PAM_AUTH_ERR);
186 lc = login_getpwclass(pwd);
188 PAM_LOG("Unable to get login class for user %s", user);
189 return (PAM_SERVICE_ERR);
192 PAM_LOG("Got login_cap");
194 if (pwd->pw_change || pwd->pw_expire)
195 gettimeofday(&tp, NULL);
198 * Check pw_expire before pw_change - no point in letting the
199 * user change the password on an expired account.
202 if (pwd->pw_expire) {
203 warntime = login_getcaptime(lc, "warnexpire",
204 DEFAULT_WARN, DEFAULT_WARN);
205 if (tp.tv_sec >= pwd->pw_expire) {
207 return (PAM_ACCT_EXPIRED);
208 } else if (pwd->pw_expire - tp.tv_sec < warntime &&
209 (flags & PAM_SILENT) == 0) {
210 pam_error(pamh, "Warning: your account expires on %s",
211 ctime(&pwd->pw_expire));
215 retval = PAM_SUCCESS;
216 if (pwd->pw_change) {
217 warntime = login_getcaptime(lc, "warnpassword",
218 DEFAULT_WARN, DEFAULT_WARN);
219 if (tp.tv_sec >= pwd->pw_change) {
220 retval = PAM_NEW_AUTHTOK_REQD;
221 } else if (pwd->pw_change - tp.tv_sec < warntime &&
222 (flags & PAM_SILENT) == 0) {
223 pam_error(pamh, "Warning: your password expires on %s",
224 ctime(&pwd->pw_change));
229 * From here on, we must leave retval untouched (unless we
230 * know we're going to fail), because we need to remember
231 * whether we're supposed to return PAM_SUCCESS or
232 * PAM_NEW_AUTHTOK_REQD.
235 if (rhost && *(const char *)rhost != '\0') {
236 memset(&hints, 0, sizeof(hints));
237 hints.ai_family = AF_UNSPEC;
238 if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
239 getnameinfo(res->ai_addr, res->ai_addrlen,
240 rhostip, sizeof(rhostip), NULL, 0,
248 * Check host / tty / time-of-day restrictions
251 if (!auth_hostok(lc, rhost, rhostip) ||
252 !auth_ttyok(lc, tty) ||
253 !auth_timeok(lc, time(NULL)))
254 retval = PAM_AUTH_ERR;
262 * password management
264 * standard Unix and NIS password changing
267 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
268 int argc __unused, const char *argv[] __unused)
271 struct ypclnt *ypclnt;
272 const void *yp_domain, *yp_server;
274 char salt[SALTSIZE + 1];
276 struct passwd *pwd, *old_pwd;
277 const char *user, *old_pass, *new_pass;
280 int pfd, tfd, retval;
282 if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF))
283 pwd = getpwnam(getlogin());
285 retval = pam_get_user(pamh, &user, NULL);
286 if (retval != PAM_SUCCESS)
288 pwd = getpwnam(user);
292 return (PAM_AUTHTOK_RECOVERY_ERR);
294 PAM_LOG("Got user: %s", user);
296 if (flags & PAM_PRELIM_CHECK) {
298 PAM_LOG("PRELIM round");
301 (pwd->pw_fields & _PWF_SOURCE) == _PWF_FILES)
302 /* root doesn't need the old password */
303 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
306 (pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
308 yp_domain = yp_server = NULL;
309 (void)pam_get_data(pamh, "yp_domain", &yp_domain);
310 (void)pam_get_data(pamh, "yp_server", &yp_server);
312 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_server);
314 return (PAM_BUF_ERR);
316 if (ypclnt_connect(ypclnt) == -1) {
318 return (PAM_SERVICE_ERR);
321 retval = ypclnt_havepasswdd(ypclnt);
324 return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
325 else if (retval == -1)
326 return (PAM_SERVICE_ERR);
329 if (pwd->pw_passwd[0] == '\0'
330 && openpam_get_option(pamh, PAM_OPT_NULLOK)) {
332 * No password case. XXX Are we giving too much away
333 * by not prompting for a password?
334 * XXX check PAM_DISALLOW_NULL_AUTHTOK
338 retval = pam_get_authtok(pamh,
339 PAM_OLDAUTHTOK, &old_pass, NULL);
340 if (retval != PAM_SUCCESS)
343 PAM_LOG("Got old password");
344 /* always encrypt first */
345 encrypted = crypt(old_pass, pwd->pw_passwd);
346 if (old_pass[0] == '\0' &&
347 !openpam_get_option(pamh, PAM_OPT_NULLOK))
348 return (PAM_PERM_DENIED);
349 if (strcmp(encrypted, pwd->pw_passwd) != 0)
350 return (PAM_PERM_DENIED);
352 else if (flags & PAM_UPDATE_AUTHTOK) {
353 PAM_LOG("UPDATE round");
355 retval = pam_get_authtok(pamh,
356 PAM_OLDAUTHTOK, &old_pass, NULL);
357 if (retval != PAM_SUCCESS)
359 PAM_LOG("Got old password");
361 /* get new password */
363 retval = pam_get_authtok(pamh,
364 PAM_AUTHTOK, &new_pass, NULL);
365 if (retval != PAM_TRY_AGAIN)
367 pam_error(pamh, "Mismatch; try again, EOF to quit.");
369 PAM_LOG("Got new password");
370 if (retval != PAM_SUCCESS) {
371 PAM_VERBOSE_ERROR("Unable to get new password");
375 if (getuid() != 0 && new_pass[0] == '\0' &&
376 !openpam_get_option(pamh, PAM_OPT_NULLOK))
377 return (PAM_PERM_DENIED);
379 if ((old_pwd = pw_dup(pwd)) == NULL)
380 return (PAM_BUF_ERR);
382 lc = login_getclass(pwd->pw_class);
383 if (login_setcryptfmt(lc, password_hash, NULL) == NULL)
384 openpam_log(PAM_LOG_ERROR,
385 "can't set password cipher, relying on default");
387 /* set password expiry date */
389 passwordtime = login_getcaptime(lc, "passwordtime", 0, 0);
390 if (passwordtime > 0)
391 pwd->pw_change = time(NULL) + passwordtime;
395 pwd->pw_passwd = crypt(new_pass, salt);
397 switch (old_pwd->pw_fields & _PWF_SOURCE) {
400 retval = PAM_SERVICE_ERR;
401 if (pw_init(NULL, NULL))
402 openpam_log(PAM_LOG_ERROR, "pw_init() failed");
403 else if ((pfd = pw_lock()) == -1)
404 openpam_log(PAM_LOG_ERROR, "pw_lock() failed");
405 else if ((tfd = pw_tmp(-1)) == -1)
406 openpam_log(PAM_LOG_ERROR, "pw_tmp() failed");
407 else if (pw_copy(pfd, tfd, pwd, old_pwd) == -1)
408 openpam_log(PAM_LOG_ERROR, "pw_copy() failed");
409 else if (pw_mkdb(pwd->pw_name) == -1)
410 openpam_log(PAM_LOG_ERROR, "pw_mkdb() failed");
412 retval = PAM_SUCCESS;
417 yp_domain = yp_server = NULL;
418 (void)pam_get_data(pamh, "yp_domain", &yp_domain);
419 (void)pam_get_data(pamh, "yp_server", &yp_server);
420 ypclnt = ypclnt_new(yp_domain,
421 "passwd.byname", yp_server);
422 if (ypclnt == NULL) {
423 retval = PAM_BUF_ERR;
424 } else if (ypclnt_connect(ypclnt) == -1 ||
425 ypclnt_passwd(ypclnt, pwd, old_pass) == -1) {
426 openpam_log(PAM_LOG_ERROR, "%s", ypclnt->error);
427 retval = PAM_SERVICE_ERR;
429 retval = PAM_SUCCESS;
434 openpam_log(PAM_LOG_ERROR, "unsupported source 0x%x",
435 pwd->pw_fields & _PWF_SOURCE);
436 retval = PAM_SERVICE_ERR;
444 PAM_LOG("Illegal 'flags'");
450 /* Mostly stolen from passwd(1)'s local_passwd.c - markm */
452 static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
453 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
456 to64(char *s, long v, int n)
459 *s++ = itoa64[v&0x3f];
464 /* Salt suitable for traditional DES and MD5 */
466 makesalt(char salt[SALTSIZE])
470 /* These are not really random numbers, they are just
471 * numbers that change to thwart construction of a
472 * dictionary. This is exposed to the public.
474 for (i = 0; i < SALTSIZE; i += 4)
475 to64(&salt[i], arc4random(), 4);
476 salt[SALTSIZE] = '\0';
479 PAM_MODULE_ENTRY("pam_unix");