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/*
* Copyright (c) 2012, 2014-2016 Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#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 */
#include <unistd.h>
#include <errno.h>
#include "sudo_compat.h"
#include "sudo_util.h"
#include "sudo_debug.h"
/*
* Verify that path is the right type and not writable by other users.
*/
static int
sudo_secure_path(const char *path, unsigned int type, uid_t uid, gid_t gid, struct stat *sbp)
{
struct stat sb;
int ret = SUDO_PATH_MISSING;
debug_decl(sudo_secure_path, SUDO_DEBUG_UTIL)
if (path != NULL && stat(path, &sb) == 0) {
if ((sb.st_mode & _S_IFMT) != type) {
ret = SUDO_PATH_BAD_TYPE;
} else if (uid != (uid_t)-1 && sb.st_uid != uid) {
ret = SUDO_PATH_WRONG_OWNER;
} else if (sb.st_mode & S_IWOTH) {
ret = SUDO_PATH_WORLD_WRITABLE;
} else if (ISSET(sb.st_mode, S_IWGRP) &&
(gid == (gid_t)-1 || sb.st_gid != gid)) {
ret = SUDO_PATH_GROUP_WRITABLE;
} else {
ret = SUDO_PATH_SECURE;
}
if (sbp)
(void) memcpy(sbp, &sb, sizeof(struct stat));
}
debug_return_int(ret);
}
/*
* Verify that path is a regular file and not writable by other users.
*/
int
sudo_secure_file_v1(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
{
return sudo_secure_path(path, _S_IFREG, uid, gid, sbp);
}
/*
* Verify that path is a directory and not writable by other users.
*/
int
sudo_secure_dir_v1(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
{
return sudo_secure_path(path, _S_IFDIR, uid, gid, sbp);
}
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