/*
* Copyright (c) 2024 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
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*/
/* compile: xcrun -sdk macosx.internal clang -ldarwintest -lsandbox -o sandbox_fstat sandbox_fstat.c -g -Weverything */
#include <sys/paths.h>
#include <sys/xattr.h>
#include <sandbox/libsandbox.h>
#include <TargetConditionals.h>
#include <darwintest.h>
#include <darwintest/utils.h>
#define RUN_TEST TARGET_OS_OSX
static char template[MAXPATHLEN];
static char *testdir = NULL;
static char file[PATH_MAX], file_rsrcfork[PATH_MAX];
static sandbox_params_t params = NULL;
static sandbox_profile_t profile = NULL;
T_GLOBAL_META(
T_META_NAMESPACE("xnu.vfs"),
T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("vfs"),
T_META_ASROOT(false),
T_META_ENABLED(RUN_TEST),
T_META_CHECK_LEAKS(false));
static void
cleanup(void)
{
if (profile) {
sandbox_free_profile(profile);
}
if (params) {
sandbox_free_params(params);
}
if (file[0] != '\0') {
unlink(file);
}
if (testdir) {
rmdir(testdir);
}
}
static void
create_profile_string(char *buff, size_t size)
{
snprintf(buff, size, "(version 1) \n\
(allow default) \n\
(import \"system.sb\") \n\
(deny file-read-metadata (path \"%s\")) \n",
file);
}
static void
do_test(int expected_error)
{
int fd;
struct stat sb;
/* Test stat() */
if (expected_error) {
T_EXPECT_POSIX_FAILURE(stat(file, &sb), expected_error, "Calling stat() should FAIL with '%s'", strerror(expected_error));
} else {
T_EXPECT_POSIX_SUCCESS(stat(file, &sb), "Calling stat() for the file should PASS");
}
/* Test fstat() while the file is open with the O_CREAT | O_WRONLY flags */
T_EXPECT_POSIX_SUCCESS(fd = open(file, O_CREAT | O_WRONLY, 0666), "Opening with the O_CREAT | O_WRONLY flags");
if (fd != -1) {
if (expected_error) {
T_EXPECT_POSIX_FAILURE(fstat(fd, &sb), expected_error, "Calling fstat() should FAIL with '%s'", strerror(expected_error));
} else {
T_EXPECT_POSIX_SUCCESS(fstat(fd, &sb), "Calling fstat() for the test file should PASS");
}
close(fd);
}
T_EXPECT_POSIX_SUCCESS(fd = open(file_rsrcfork, O_CREAT | O_WRONLY, 0666), "Opening rsrcfork with the O_CREAT | O_WRONLY flags");
if (fd != -1) {
T_EXPECT_POSIX_SUCCESS(fstat(fd, &sb), "Calling fstat() for the rsrcfork should PASS");
close(fd);
}
}
T_DECL(sandbox_fstat,
"Prevent the information disclosure on files opened with O_WRONLY while sandbox profile denies 'file-read-metadata'")
{
#if (!RUN_TEST)
T_SKIP("Not macOS");
#endif
int fd;
char *sberror = NULL;
char profile_string[1000];
char testdir_path[MAXPATHLEN];
file[0] = '\0';
T_ATEND(cleanup);
T_SETUPBEGIN;
/* Create test root dir */
snprintf(template, sizeof(template), "%s/sandbox_fstat-XXXXXX", dt_tmpdir());
T_ASSERT_POSIX_NOTNULL((testdir = mkdtemp(template)), "Creating test root dir");
T_ASSERT_POSIX_SUCCESS((fd = open(testdir, O_SEARCH, 0777)), "Opening test root directory '%s'", testdir);
T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_GETPATH, testdir_path), "Calling fcntl() to get the path");
T_ASSERT_POSIX_SUCCESS(close(fd), "Closing %s", testdir_path);
/* Setup file names */
snprintf(file, sizeof(file), "%s/%s", testdir_path, "file");
snprintf(file_rsrcfork, sizeof(file_rsrcfork), "%s/%s", file, _PATH_RSRCFORKSPEC);
/* Create the test file */
T_ASSERT_POSIX_SUCCESS((fd = open(file, O_CREAT | O_RDWR, 0777)), "Creating '%s'", file);
T_ASSERT_POSIX_SUCCESS(close(fd), "Closing '%s'", file);
/* Create sandbox variables */
T_ASSERT_POSIX_NOTNULL(params = sandbox_create_params(), "Creating Sandbox params object");
create_profile_string(profile_string, sizeof(profile_string));
T_ASSERT_POSIX_NOTNULL(profile = sandbox_compile_string(profile_string, params, &sberror), "Creating Sandbox profile object");
T_SETUPEND;
/* Test stat()/fstat() */
do_test(0);
/* Apply sandbox profile */
T_ASSERT_POSIX_SUCCESS(sandbox_apply(profile), "Applying Sandbox profile");
/* Test stat()/fstat() */
do_test(EPERM);
}