/*
* Copyright 2001, 2004 Red Hat, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
#include <security/pam_ext.h>
#define MODULE_NAME "pam_localuser"
int
pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED,
int argc, const char **argv)
{
int i, ret = PAM_SUCCESS;
FILE *fp;
int debug = 0;
const char *filename = "/etc/passwd";
char line[LINE_MAX], name[LINE_MAX];
const char* user;
/* process arguments */
for(i = 0; i < argc; i++) {
if(strcmp("debug", argv[i]) == 0) {
debug = 1;
}
}
for(i = 0; i < argc; i++) {
if(strncmp("file=", argv[i], 5) == 0) {
filename = argv[i] + 5;
if(debug) {
pam_syslog (pamh, LOG_DEBUG,
"set filename to \"%s\"",
filename);
}
}
}
/* open the file */
fp = fopen(filename, "r");
if(fp == NULL) {
pam_syslog (pamh, LOG_ERR, "error opening \"%s\": %m",
filename);
return PAM_SYSTEM_ERR;
}
if(pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) {
pam_syslog (pamh, LOG_ERR, "user name not specified yet");
fclose(fp);
return PAM_SYSTEM_ERR;
}
if ((user == NULL) || (strlen(user) == 0)) {
pam_syslog (pamh, LOG_ERR, "user name not valid");
fclose(fp);
return PAM_SYSTEM_ERR;
}
/* scan the file, using fgets() instead of fgetpwent() because i
* don't want to mess with applications which call fgetpwent() */
ret = PAM_PERM_DENIED;
snprintf(name, sizeof(name), "%s:", user);
i = strlen(name);
while(fgets(line, sizeof(line), fp) != NULL) {
if(debug) {
pam_syslog (pamh, LOG_DEBUG, "checking \"%s\"", line);
}
if(strncmp(name, line, i) == 0) {
ret = PAM_SUCCESS;
break;
}
}
/* okay, we're done */
fclose(fp);
return ret;
}
int
pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED,
int argc UNUSED, const char **argv UNUSED)
{
return PAM_SUCCESS;
}
int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
int
pam_sm_open_session (pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
int
pam_sm_close_session (pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
int
pam_sm_chauthtok (pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}