119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/* $NetBSD: perm.c,v 1.3 2008/04/05 16:26:57 christos Exp $ */
|
|
|
|
/*
|
|
* perm.c - check user permission for at(1)
|
|
* Copyright (C) 1994 Thomas Koenig
|
|
*
|
|
* 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, this list of conditions and the following disclaimer.
|
|
* 2. The name of the author(s) may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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, WETHER 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.
|
|
*/
|
|
|
|
/* System Headers */
|
|
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <pwd.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
/* Local headers */
|
|
|
|
#include "at.h"
|
|
#include "panic.h"
|
|
#include "pathnames.h"
|
|
#include "privs.h"
|
|
#include "perm.h"
|
|
|
|
/* File scope variables */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char rcsid[] = "$OpenBSD: perm.c,v 1.1 1997/03/01 23:40:12 millert Exp $";
|
|
#else
|
|
__RCSID("$NetBSD: perm.c,v 1.3 2008/04/05 16:26:57 christos Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
/* Local functions */
|
|
|
|
static bool
|
|
check_for_user(FILE *fp, const char *name)
|
|
{
|
|
char *buffer;
|
|
size_t len;
|
|
bool found = false;
|
|
|
|
len = strlen(name);
|
|
if ((buffer = malloc(len + 2)) == NULL)
|
|
panic("Insufficient virtual memory");
|
|
|
|
while (fgets(buffer, (int)len + 2, fp) != NULL) {
|
|
if (strncmp(name, buffer, len) == 0 && buffer[len] == '\n') {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
(void)fclose(fp);
|
|
free(buffer);
|
|
return found;
|
|
}
|
|
|
|
/* Global functions */
|
|
|
|
bool
|
|
check_permission(void)
|
|
{
|
|
FILE *fp;
|
|
uid_t uid = geteuid();
|
|
struct passwd *pentry;
|
|
|
|
if (uid == 0)
|
|
return true;
|
|
|
|
if ((pentry = getpwuid(uid)) == NULL) {
|
|
perror("Cannot access user database");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
PRIV_START;
|
|
|
|
fp = fopen(_PATH_AT_ALLOW, "r");
|
|
|
|
PRIV_END;
|
|
|
|
if (fp != NULL) {
|
|
return check_for_user(fp, pentry->pw_name);
|
|
} else {
|
|
PRIV_START;
|
|
|
|
fp = fopen(_PATH_AT_DENY, "r");
|
|
|
|
PRIV_END;
|
|
|
|
if (fp != NULL)
|
|
return !check_for_user(fp, pentry->pw_name);
|
|
}
|
|
return false;
|
|
}
|