1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * The 'fsverity measure' command
4 *
5 * Copyright (C) 2018 Google LLC
6 *
7 * Written by Eric Biggers.
8 */
9
10 #include <fcntl.h>
11 #include <stdlib.h>
12 #include <sys/ioctl.h>
13
14 #include "commands.h"
15 #include "fsverity_uapi.h"
16 #include "hash_algs.h"
17
fsverity_cmd_measure(const struct fsverity_command * cmd,int argc,char * argv[])18 int fsverity_cmd_measure(const struct fsverity_command *cmd,
19 int argc, char *argv[])
20 {
21 struct fsverity_digest *d = NULL;
22 struct filedes file;
23 char digest_hex[FS_VERITY_MAX_DIGEST_SIZE * 2 + 1];
24 const struct fsverity_hash_alg *hash_alg;
25 char _hash_alg_name[32];
26 const char *hash_alg_name;
27 int status;
28 int i;
29
30 if (argc < 2)
31 goto out_usage;
32
33 d = xzalloc(sizeof(*d) + FS_VERITY_MAX_DIGEST_SIZE);
34
35 for (i = 1; i < argc; i++) {
36 d->digest_size = FS_VERITY_MAX_DIGEST_SIZE;
37
38 if (!open_file(&file, argv[i], O_RDONLY, 0))
39 goto out_err;
40 if (ioctl(file.fd, FS_IOC_MEASURE_VERITY, d) != 0) {
41 error_msg_errno("FS_IOC_MEASURE_VERITY failed on '%s'",
42 file.name);
43 filedes_close(&file);
44 goto out_err;
45 }
46 filedes_close(&file);
47
48 ASSERT(d->digest_size <= FS_VERITY_MAX_DIGEST_SIZE);
49 bin2hex(d->digest, d->digest_size, digest_hex);
50 hash_alg = find_hash_alg_by_num(d->digest_algorithm);
51 if (hash_alg) {
52 hash_alg_name = hash_alg->name;
53 } else {
54 sprintf(_hash_alg_name, "ALG_%u", d->digest_algorithm);
55 hash_alg_name = _hash_alg_name;
56 }
57 printf("%s:%s %s\n", hash_alg_name, digest_hex, argv[i]);
58 }
59 status = 0;
60 out:
61 free(d);
62 return status;
63
64 out_err:
65 status = 1;
66 goto out;
67
68 out_usage:
69 usage(cmd, stderr);
70 status = 2;
71 goto out;
72 }
73