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pam_guest.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2003 Networks Associates Technology, Inc.
      3  * All rights reserved.
      4  *
      5  * Portions of this software were developed for the FreeBSD Project by
      6  * ThinkSec AS and NAI Labs, the Security Research Division of Network
      7  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
      8  * ("CBOSS"), as part of the DARPA CHATS research program.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. The name of the author may not be used to endorse or promote
     19  *    products derived from this software without specific prior written
     20  *    permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_guest/pam_guest.c,v 1.1 2003/05/31 16:52:58 des Exp $");
     37 
     38 #include <string.h>
     39 
     40 #define PAM_SM_AUTH
     41 
     42 #include <security/pam_appl.h>
     43 #include <security/pam_modules.h>
     44 #include <security/openpam.h>
     45 
     46 #define DEFAULT_GUESTS	"guest"
     47 
     48 static int
     49 lookup(const char *str, const char *list)
     50 {
     51 	const char *next;
     52 	size_t len;
     53 
     54 	len = strlen(str);
     55 	while (*list != '\0') {
     56 		while (*list == ',')
     57 			++list;
     58 		if ((next = strchr(list, ',')) == NULL)
     59 			next = strchr(list, '\0');
     60 		if (next - list == (ptrdiff_t)len &&
     61 		    strncmp(list, str, len) == 0)
     62 			return (1);
     63 		list = next;
     64 	}
     65 	return (0);
     66 }
     67 
     68 PAM_EXTERN int
     69 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     70     int argc __unused, const char *argv[] __unused)
     71 {
     72 	const char *authtok, *guests, *user;
     73 	int err, is_guest;
     74 
     75 	/* get target account */
     76 	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
     77 		return (PAM_AUTH_ERR);
     78 
     79 	/* get list of guest logins */
     80 	if ((guests = openpam_get_option(pamh, "guests")) == NULL)
     81 		guests = DEFAULT_GUESTS;
     82 
     83 	/* check if the target account is on the list */
     84 	is_guest = lookup(user, guests);
     85 
     86 	/* check password */
     87 	if (!openpam_get_option(pamh, "nopass")) {
     88 		err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
     89 		if (err != PAM_SUCCESS)
     90 			return (err);
     91 		if (openpam_get_option(pamh, "pass_is_user") &&
     92 		    strcmp(user, authtok) != 0)
     93 			return (PAM_AUTH_ERR);
     94 		if (openpam_get_option(pamh, "pass_as_ruser"))
     95 			pam_set_item(pamh, PAM_RUSER, authtok);
     96 	}
     97 
     98 	/* done */
     99 	if (is_guest) {
    100 		pam_setenv(pamh, "GUEST", user, 1);
    101 		return (PAM_SUCCESS);
    102 	}
    103 	return (PAM_AUTH_ERR);
    104 }
    105 
    106 PAM_EXTERN int
    107 pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
    108     int argc __unused, const char *argv[] __unused)
    109 {
    110 
    111 	return (PAM_SUCCESS);
    112 }
    113 
    114 PAM_MODULE_ENTRY("pam_guest");
    115