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/*
* CU sudo version 1.5.4
*
* 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 1, 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.
*
* Please send bugs, changes, problems to sudo-bugs@courtesan.com
*
*******************************************************************
*
* This module contains sudo_goodpath(3)
*
* sudo_goodpath(3) takes a path to check and returns its argument
* if the path is stat(2)'able, a regular file, and executable by
* root. The string's size should be <= MAXPATHLEN.
*
* Todd C. Miller (millert@colorado.edu) Sat Mar 25 21:58:17 MST 1995
*/
#ifndef lint
static char rcsid[] = "$Id: goodpath.c,v 1.15 1998/01/13 04:48:17 millert Exp $";
#endif /* lint */
#include "config.h"
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <netinet/in.h>
#include "sudo.h"
#include <options.h>
#ifndef STDC_HEADERS
extern int stat __P((const char *, struct stat *));
#endif /* !STDC_HEADERS */
/******************************************************************
*
* sudo_goodpath()
*
* this function takes a path and makes sure it describes a a file
* that is a normal file and executable by root.
*/
char * sudo_goodpath(path)
const char * path;
{
struct stat statbuf; /* for stat(2) */
int err; /* if stat(2) got an error */
/* check for brain damage */
if (path == NULL || path[0] == '\0')
return(NULL);
/* we need to be root for the stat */
set_perms(PERM_ROOT, 0);
err = stat(path, &statbuf);
/* discard root perms */
set_perms(PERM_USER, 0);
/* stat(3) failed */
if (err)
return(NULL);
/* make sure path describes an executable regular file */
if (S_ISREG(statbuf.st_mode) && (statbuf.st_mode & 0000111)) {
return((char *)path);
} else {
/* file is not executable/regular */
errno = EACCES;
return(NULL);
}
}
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