1/* $NetBSD$ */ 2 3/*- 4 * Copyright (c) 2003 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * Portions of this software were 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. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 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 22 * permission. 23 * 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 34 * SUCH DAMAGE. 35 */ 36 37#include <sys/cdefs.h> 38#ifdef __FreeBSD__ 39__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_guest/pam_guest.c,v 1.1 2003/05/31 16:52:58 des Exp $"); 40#else 41__RCSID("$NetBSD$"); 42#endif 43 44#include <string.h> 45 46#define PAM_SM_AUTH 47 48#include <security/pam_appl.h> 49#include <security/pam_modules.h> 50#include <security/openpam.h> 51 52#define DEFAULT_GUESTS "guest" 53 54static int 55lookup(const char *str, const char *list) 56{ 57 const char *next; 58 size_t len; 59 60 len = strlen(str); 61 while (*list != '\0') { 62 while (*list == ',') 63 ++list; 64 if ((next = strchr(list, ',')) == NULL) 65 next = strchr(list, '\0'); 66 if (next - list == (ptrdiff_t)len && 67 strncmp(list, str, len) == 0) 68 return (1); 69 list = next; 70 } 71 return (0); 72} 73 74PAM_EXTERN int 75pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 76 int argc __unused, const char *argv[] __unused) 77{ 78 const char *authtok, *guests, *user; 79 int err, is_guest; 80 81 /* get target account */ 82 if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL) 83 return (PAM_AUTH_ERR); 84 85 /* get list of guest logins */ 86 if ((guests = openpam_get_option(pamh, "guests")) == NULL) 87 guests = DEFAULT_GUESTS; 88 89 /* check if the target account is on the list */ 90 is_guest = lookup(user, guests); 91 92 /* check password */ 93 if (!openpam_get_option(pamh, "nopass")) { 94 err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL); 95 if (err != PAM_SUCCESS) 96 return (err); 97 if (openpam_get_option(pamh, "pass_is_user") && 98 strcmp(user, authtok) != 0) 99 return (PAM_AUTH_ERR); 100 if (openpam_get_option(pamh, "pass_as_ruser")) 101 pam_set_item(pamh, PAM_RUSER, authtok); 102 } 103 104 /* done */ 105 if (is_guest) { 106 pam_setenv(pamh, "GUEST", user, 1); 107 return (PAM_SUCCESS); 108 } 109 return (PAM_AUTH_ERR); 110} 111 112PAM_EXTERN int 113pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, 114 int argc __unused, const char *argv[] __unused) 115{ 116 117 return (PAM_SUCCESS); 118} 119 120PAM_MODULE_ENTRY("pam_guest"); 121