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/*
* perm.c - check user permission for at(1)
* Copyright (C) 1994 Thomas Koenig
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* System Headers */
#include <sys/types.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Local headers */
#include "privs.h"
#include "at.h"
/* Macros */
#define MAXUSERID 10
/* Structures and unions */
/* File scope variables */
static char rcsid[] = "$Id: perm.c,v 1.4 1997/03/12 19:36:06 ig25 Exp $";
/* Function declarations */
static int check_for_user(FILE * fp, const char *name);
/* Local functions */
static int
check_for_user(FILE * fp, const char *name)
{
char *buffer;
size_t len;
int found = 0;
len = strlen(name);
buffer = mymalloc(len + 2);
while (fgets(buffer, len + 2, fp) != NULL) {
if ((strncmp(name, buffer, len) == 0) &&
(buffer[len] == '\n')) {
found = 1;
break;
}
}
fclose(fp);
free(buffer);
return found;
}
/* Global functions */
int
check_permission()
{
FILE *fp;
uid_t uid = geteuid();
struct passwd *pentry;
if (uid == 0)
return 1;
if ((pentry = getpwuid(uid)) == NULL) {
perror("Cannot access user database");
exit(EXIT_FAILURE);
}
PRIV_START
fp = fopen(ETCDIR "/at.allow", "r");
PRIV_END
if (fp != NULL) {
return check_for_user(fp, pentry->pw_name);
} else {
PRIV_START
fp = fopen(ETCDIR "/at.deny", "r");
PRIV_END
if (fp != NULL) {
return !check_for_user(fp, pentry->pw_name);
}
perror("at.deny");
}
return 0;
}
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