mirror of
https://github.com/openharmony/third_party_fsverity-utils.git
synced 2026-07-01 10:05:35 -04:00
Eric Biggers
5cd90ca608
From the 'fsverity' program, split out a library 'libfsverity'.
Currently it supports computing file measurements ("digests"), and
signing those file measurements for use with the fs-verity builtin
signature verification feature.
Rewritten from patches by Jes Sorensen <jsorensen@fb.com>.
I made a lot of improvements, e.g.:
- Separated library and program source into different directories.
- Drastically improved the Makefile.
- Added 'make check' target and rules to build test programs.
- In the shared lib, only export the functions intended to be public.
- Prefixed global functions with "libfsverity_" so that they don't cause
conflicts when the library is built as a static library.
- Made library error messages be sent to a user-specified callback
rather than always be printed to stderr.
- Keep showing OpenSSL error messages.
- Stopped abort()ing in library code, when possible.
- Made libfsverity_digest use native endianness.
- Moved file_size into the merkle_tree_params.
- Made libfsverity_get_hash_name() just return the static strings.
- Made some variables in the API uint32_t instead of uint16_t.
- Shared parse_hash_alg_option() between cmd_enable and cmd_sign.
- Lots of other fixes.
(Folded in a couple Makefile fixes from Jes.)
Reviewed-by: Jes Sorensen <jsorensen@fb.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The 'fsverity measure' command
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*
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* Copyright 2018 Google LLC
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*/
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#include "fsverity.h"
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#include <fcntl.h>
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#include <sys/ioctl.h>
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/* Display the measurement of the given verity file(s). */
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int fsverity_cmd_measure(const struct fsverity_command *cmd,
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int argc, char *argv[])
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{
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struct fsverity_digest *d = NULL;
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struct filedes file;
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char digest_hex[FS_VERITY_MAX_DIGEST_SIZE * 2 + 1];
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char _hash_alg_name[32];
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const char *hash_alg_name;
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int status;
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int i;
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if (argc < 2)
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goto out_usage;
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d = xzalloc(sizeof(*d) + FS_VERITY_MAX_DIGEST_SIZE);
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for (i = 1; i < argc; i++) {
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d->digest_size = FS_VERITY_MAX_DIGEST_SIZE;
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if (!open_file(&file, argv[i], O_RDONLY, 0))
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goto out_err;
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if (ioctl(file.fd, FS_IOC_MEASURE_VERITY, d) != 0) {
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error_msg_errno("FS_IOC_MEASURE_VERITY failed on '%s'",
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file.name);
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filedes_close(&file);
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goto out_err;
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}
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filedes_close(&file);
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ASSERT(d->digest_size <= FS_VERITY_MAX_DIGEST_SIZE);
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bin2hex(d->digest, d->digest_size, digest_hex);
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hash_alg_name = libfsverity_get_hash_name(d->digest_algorithm);
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if (!hash_alg_name) {
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sprintf(_hash_alg_name, "ALG_%u", d->digest_algorithm);
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hash_alg_name = _hash_alg_name;
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}
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printf("%s:%s %s\n", hash_alg_name, digest_hex, argv[i]);
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}
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status = 0;
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out:
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free(d);
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return status;
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out_err:
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status = 1;
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goto out;
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out_usage:
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usage(cmd, stderr);
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status = 2;
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goto out;
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}
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