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// SPDX-License-Identifier: MIT
/*
* The 'fsverity measure' command
*
* Copyright 2018 Google LLC
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
*/
#include "fsverity.h"
#include <fcntl.h>
#include <getopt.h>
#include <sys/ioctl.h>
static const struct option longopts[] = {
{NULL, 0, NULL, 0}
};
/* Display the fs-verity digest of the given verity file(s). */
int fsverity_cmd_measure(const struct fsverity_command *cmd,
int argc, char *argv[])
{
struct fsverity_digest *d = NULL;
struct filedes file;
char digest_hex[FS_VERITY_MAX_DIGEST_SIZE * 2 + 1];
char _hash_alg_name[32];
const char *hash_alg_name;
int status;
int i;
/*
* No supported options, but run getopt_long() with an empty longopts
* array so that any options are rejected and "--" works as expected.
*/
if (getopt_long(argc, argv, "", longopts, NULL) != -1)
goto out_usage;
argv += optind;
argc -= optind;
if (argc < 1)
goto out_usage;
d = xzalloc(sizeof(*d) + FS_VERITY_MAX_DIGEST_SIZE);
for (i = 0; i < argc; i++) {
d->digest_size = FS_VERITY_MAX_DIGEST_SIZE;
if (!open_file(&file, argv[i], O_RDONLY, 0))
goto out_err;
if (ioctl(file.fd, FS_IOC_MEASURE_VERITY, d) != 0) {
error_msg_errno("FS_IOC_MEASURE_VERITY failed on '%s'",
file.name);
filedes_close(&file);
goto out_err;
}
filedes_close(&file);
ASSERT(d->digest_size <= FS_VERITY_MAX_DIGEST_SIZE);
bin2hex(d->digest, d->digest_size, digest_hex);
hash_alg_name = libfsverity_get_hash_name(d->digest_algorithm);
if (!hash_alg_name) {
sprintf(_hash_alg_name, "ALG_%u", d->digest_algorithm);
hash_alg_name = _hash_alg_name;
}
printf("%s:%s %s\n", hash_alg_name, digest_hex, argv[i]);
}
status = 0;
out:
free(d);
return status;
out_err:
status = 1;
goto out;
out_usage:
usage(cmd, stderr);
status = 2;
goto out;
}
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