6ff33922f4
Set the pointer to a struct stat on the stack if st is NULL. Avoids a needless memcpy() at the end.
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2012, 2014-2016 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sys/stat.h>
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#include <string.h>
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#include "sudo_compat.h"
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#include "sudo_util.h"
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#include "sudo_debug.h"
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/*
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* Verify that path is the right type and not writable by other users.
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*/
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static int
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sudo_secure_path(const char *path, unsigned int type, uid_t uid, gid_t gid, struct stat *sb)
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{
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struct stat stat_buf;
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int ret = SUDO_PATH_MISSING;
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debug_decl(sudo_secure_path, SUDO_DEBUG_UTIL);
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if (sb == NULL)
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sb = &stat_buf;
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if (path != NULL && stat(path, sb) == 0) {
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if ((sb->st_mode & S_IFMT) != type) {
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ret = SUDO_PATH_BAD_TYPE;
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} else if (uid != (uid_t)-1 && sb->st_uid != uid) {
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ret = SUDO_PATH_WRONG_OWNER;
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} else if (sb->st_mode & S_IWOTH) {
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ret = SUDO_PATH_WORLD_WRITABLE;
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} else if (ISSET(sb->st_mode, S_IWGRP) &&
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(gid == (gid_t)-1 || sb->st_gid != gid)) {
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ret = SUDO_PATH_GROUP_WRITABLE;
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} else {
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ret = SUDO_PATH_SECURE;
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}
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}
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debug_return_int(ret);
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}
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/*
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* Verify that path is a regular file and not writable by other users.
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*/
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int
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sudo_secure_file_v1(const char *path, uid_t uid, gid_t gid, struct stat *st)
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{
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return sudo_secure_path(path, S_IFREG, uid, gid, st);
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}
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/*
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* Verify that path is a directory and not writable by other users.
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*/
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int
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sudo_secure_dir_v1(const char *path, uid_t uid, gid_t gid, struct stat *st)
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{
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return sudo_secure_path(path, S_IFDIR, uid, gid, st);
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}
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