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// SPDX-License-Identifier: GPL-2.0+
/*
* The 'fsverity measure' command
*
* Copyright (C) 2018 Google LLC
*
* Written by Eric Biggers.
*/
#include "commands.h"
#include "fsverity_uapi.h"
#include "hash_algs.h"
#include <fcntl.h>
#include <stdlib.h>
#include <sys/ioctl.h>
/* Display the measurement 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];
const struct fsverity_hash_alg *hash_alg;
char _hash_alg_name[32];
const char *hash_alg_name;
int status;
int i;
if (argc < 2)
goto out_usage;
d = xzalloc(sizeof(*d) + FS_VERITY_MAX_DIGEST_SIZE);
for (i = 1; 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 = find_hash_alg_by_num(d->digest_algorithm);
if (hash_alg) {
hash_alg_name = hash_alg->name;
} else {
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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