crosvm/tests/vfs_crypto.c

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// Copyright 2019 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <errno.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <unistd.h>
extern char* program_invocation_short_name;
int main(int argc, char** argv) {
if (argc != 2) {
printf("Usage: %s <path_to_directory>\n", program_invocation_short_name);
return 1;
}
int dir = open(argv[1], O_DIRECTORY | O_CLOEXEC);
if (dir < 0) {
perror("Failed to open directory");
return 1;
}
struct fscrypt_policy policy;
int ret = ioctl(dir, FS_IOC_GET_ENCRYPTION_POLICY, &policy);
if (ret < 0) {
perror("FS_IOC_GET_ENCRYPTION_POLICY failed");
return 1;
}
printf("File system encryption policy:\n");
printf("\tversion = %#x\n", policy.version);
printf("\tcontents_encryption_mode = %#x\n", policy.contents_encryption_mode);
printf("\tfilenames_encryption_mode = %#x\n",
policy.filenames_encryption_mode);
printf("\tflags = %#x\n", policy.flags);
printf("\tmaster_key_descriptor = 0x");
for (int i = 0; i < FS_KEY_DESCRIPTOR_SIZE; ++i) {
printf("%x", policy.master_key_descriptor[i]);
}
printf("\n");
ret = ioctl(dir, FS_IOC_SET_ENCRYPTION_POLICY, &policy);
if (ret < 0) {
perror("FS_IOC_SET_ENCRYPTION_POLICY failed");
return 1;
}
return 0;
}