sudo/plugins/sudoers/goodpath.c

/*
 * Copyright (c) 1996, 1998-2005, 2010-2012
 *	Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

#include <config.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <errno.h>

#include "sudoers.h"

/*
 * Verify that path is a normal file and executable by root.
 */
bool
sudo_goodpath(const char *path, struct stat *sbp)
{
    struct stat sb;
    bool rval = false;
    debug_decl(sudo_goodpath, SUDO_DEBUG_UTIL)

    if (path != NULL && stat(path, &sb) == 0) {
	/* Make sure path describes an executable regular file. */
	if (S_ISREG(sb.st_mode) && ISSET(sb.st_mode, 0111))
	    rval = true;
	else
	    errno = EACCES;
	if (sbp)
	    (void) memcpy(sbp, &sb, sizeof(struct stat));
    }

    debug_return_bool(rval);
}