1115462Sdes/*- 2115462Sdes * Copyright (c) 2003 Networks Associates Technology, Inc. 3115462Sdes * All rights reserved. 4115462Sdes * 5115462Sdes * Portions of this software were developed for the FreeBSD Project by 6115462Sdes * ThinkSec AS and NAI Labs, the Security Research Division of Network 7115462Sdes * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 8115462Sdes * ("CBOSS"), as part of the DARPA CHATS research program. 9115462Sdes * 10115462Sdes * Redistribution and use in source and binary forms, with or without 11115462Sdes * modification, are permitted provided that the following conditions 12115462Sdes * are met: 13115462Sdes * 1. Redistributions of source code must retain the above copyright 14115462Sdes * notice, this list of conditions and the following disclaimer. 15115462Sdes * 2. Redistributions in binary form must reproduce the above copyright 16115462Sdes * notice, this list of conditions and the following disclaimer in the 17115462Sdes * documentation and/or other materials provided with the distribution. 18115462Sdes * 3. The name of the author may not be used to endorse or promote 19115462Sdes * products derived from this software without specific prior written 20115462Sdes * permission. 21115462Sdes * 22115462Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23115462Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24115462Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25115462Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26115462Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27115462Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28115462Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29115462Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30115462Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31115462Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32115462Sdes * SUCH DAMAGE. 33115462Sdes */ 34115462Sdes 35115462Sdes#include <sys/cdefs.h> 36115462Sdes__FBSDID("$FreeBSD$"); 37115462Sdes 38115462Sdes#include <string.h> 39115462Sdes 40115462Sdes#define PAM_SM_AUTH 41115462Sdes 42115462Sdes#include <security/pam_appl.h> 43115462Sdes#include <security/pam_modules.h> 44115462Sdes#include <security/openpam.h> 45115462Sdes 46115462Sdes#define DEFAULT_GUESTS "guest" 47115462Sdes 48115462Sdesstatic int 49115462Sdeslookup(const char *str, const char *list) 50115462Sdes{ 51115462Sdes const char *next; 52115462Sdes size_t len; 53115462Sdes 54115462Sdes len = strlen(str); 55115462Sdes while (*list != '\0') { 56115462Sdes while (*list == ',') 57115462Sdes ++list; 58115462Sdes if ((next = strchr(list, ',')) == NULL) 59115462Sdes next = strchr(list, '\0'); 60115462Sdes if (next - list == (ptrdiff_t)len && 61115462Sdes strncmp(list, str, len) == 0) 62115462Sdes return (1); 63115462Sdes list = next; 64115462Sdes } 65115462Sdes return (0); 66115462Sdes} 67115462Sdes 68115462SdesPAM_EXTERN int 69115462Sdespam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 70115462Sdes int argc __unused, const char *argv[] __unused) 71115462Sdes{ 72115462Sdes const char *authtok, *guests, *user; 73115462Sdes int err, is_guest; 74115462Sdes 75115462Sdes /* get target account */ 76115462Sdes if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL) 77115462Sdes return (PAM_AUTH_ERR); 78115462Sdes 79115462Sdes /* get list of guest logins */ 80115462Sdes if ((guests = openpam_get_option(pamh, "guests")) == NULL) 81115462Sdes guests = DEFAULT_GUESTS; 82115462Sdes 83115462Sdes /* check if the target account is on the list */ 84115462Sdes is_guest = lookup(user, guests); 85115462Sdes 86115462Sdes /* check password */ 87115462Sdes if (!openpam_get_option(pamh, "nopass")) { 88115462Sdes err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL); 89115462Sdes if (err != PAM_SUCCESS) 90115462Sdes return (err); 91115462Sdes if (openpam_get_option(pamh, "pass_is_user") && 92115462Sdes strcmp(user, authtok) != 0) 93115462Sdes return (PAM_AUTH_ERR); 94115462Sdes if (openpam_get_option(pamh, "pass_as_ruser")) 95115462Sdes pam_set_item(pamh, PAM_RUSER, authtok); 96115462Sdes } 97115462Sdes 98115462Sdes /* done */ 99115462Sdes if (is_guest) { 100115462Sdes pam_setenv(pamh, "GUEST", user, 1); 101115462Sdes return (PAM_SUCCESS); 102115462Sdes } 103115462Sdes return (PAM_AUTH_ERR); 104115462Sdes} 105115462Sdes 106115462SdesPAM_EXTERN int 107115462Sdespam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, 108115462Sdes int argc __unused, const char *argv[] __unused) 109115462Sdes{ 110115462Sdes 111115462Sdes return (PAM_SUCCESS); 112115462Sdes} 113115462Sdes 114115462SdesPAM_MODULE_ENTRY("pam_guest"); 115