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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "cryptsetup-util.h"
#include "fileio.h"
#include "hexdecoct.h"
#include "log.h"
#include "main-func.h"
#include "path-util.h"
#include "pretty-print.h"
#include "process-util.h"
#include "string-util.h"
#include "terminal-util.h"
static uint32_t arg_activate_flags = CRYPT_ACTIVATE_READONLY;
static char *arg_root_hash_signature = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_root_hash_signature, freep);
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-veritysetup@.service", "8", &link);
if (r < 0)
return log_oom();
printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH [OPTIONS]\n"
"%s detach VOLUME\n\n"
"Attach or detach a verity protected block device.\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
program_invocation_short_name,
link);
return 0;
}
static int save_roothashsig_option(const char *option, bool strict) {
int r;
if (path_is_absolute(option) || startswith(option, "base64:")) {
if (!HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Activation of verity device with signature requested, but cryptsetup does not support crypt_activate_by_signed_key().");
r = free_and_strdup_warn(&arg_root_hash_signature, option);
if (r < 0)
return r;
return true;
}
if (!strict)
return false;
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"root-hash-signature= expects either full path to signature file or "
"base64 string encoding signature prefixed by base64:.");
}
static int parse_options(const char *options) {
int r;
/* backward compatibility with the obsolete ROOTHASHSIG positional argument */
r = save_roothashsig_option(options, /* strict= */ false);
if (r < 0)
return r;
if (r > 0) {
log_warning("Usage of ROOTHASHSIG positional argument is deprecated. "
"Please use the option root-hash-signature=%s instead.", options);
return 0;
}
for (;;) {
_cleanup_free_ char *word = NULL;
char *val;
r = extract_first_word(&options, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
if (r < 0)
return log_error_errno(r, "Failed to parse options: %m");
if (r == 0)
break;
if (STR_IN_SET(word, "noauto", "auto", "nofail", "fail", "_netdev"))
continue;
if (isempty(word))
continue;
else if (streq(word, "ignore-corruption"))
arg_activate_flags |= CRYPT_ACTIVATE_IGNORE_CORRUPTION;
else if (streq(word, "restart-on-corruption"))
arg_activate_flags |= CRYPT_ACTIVATE_RESTART_ON_CORRUPTION;
else if (streq(word, "ignore-zero-blocks"))
arg_activate_flags |= CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS;
#ifdef CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE
else if (streq(word, "check-at-most-once"))
arg_activate_flags |= CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE;
#endif
#ifdef CRYPT_ACTIVATE_PANIC_ON_CORRUPTION
else if (streq(word, "panic-on-corruption"))
arg_activate_flags |= CRYPT_ACTIVATE_PANIC_ON_CORRUPTION;
#endif
else if ((val = startswith(word, "root-hash-signature="))) {
r = save_roothashsig_option(val, /* strict= */ true);
if (r < 0)
return r;
} else
log_warning("Encountered unknown option '%s', ignoring.", word);
}
return r;
}
static int run(int argc, char *argv[]) {
_cleanup_(crypt_freep) struct crypt_device *cd = NULL;
const char *verb;
int r;
if (argv_looks_like_help(argc, argv))
return help();
if (argc < 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires at least two arguments.");
log_setup();
cryptsetup_enable_logging(NULL);
umask(0022);
verb = argv[1];
if (streq(verb, "attach")) {
const char *volume, *data_device, *verity_device, *root_hash, *options;
_cleanup_free_ void *m = NULL;
crypt_status_info status;
size_t l;
if (argc < 6)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least four arguments.");
volume = argv[2];
data_device = argv[3];
verity_device = argv[4];
root_hash = argv[5];
options = mangle_none(argc > 6 ? argv[6] : NULL);
if (!filename_is_valid(volume))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
r = unhexmem(root_hash, SIZE_MAX, &m, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash: %m");
r = crypt_init(&cd, verity_device);
if (r < 0)
return log_error_errno(r, "Failed to open verity device %s: %m", verity_device);
cryptsetup_enable_logging(cd);
status = crypt_status(cd, volume);
if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
log_info("Volume %s already active.", volume);
return 0;
}
if (options) {
r = parse_options(options);
if (r < 0)
return log_error_errno(r, "Failed to parse options: %m");
}
r = crypt_load(cd, CRYPT_VERITY, NULL);
if (r < 0)
return log_error_errno(r, "Failed to load verity superblock: %m");
r = crypt_set_data_device(cd, data_device);
if (r < 0)
return log_error_errno(r, "Failed to configure data device: %m");
if (arg_root_hash_signature) {
#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
_cleanup_free_ char *hash_sig = NULL;
size_t hash_sig_size;
char *value;
if ((value = startswith(arg_root_hash_signature, "base64:"))) {
r = unbase64mem(value, strlen(value), (void *)&hash_sig, &hash_sig_size);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash signature '%s': %m", arg_root_hash_signature);
} else {
r = read_full_file_full(
AT_FDCWD, arg_root_hash_signature, UINT64_MAX, SIZE_MAX,
READ_FULL_FILE_CONNECT_SOCKET,
NULL,
&hash_sig, &hash_sig_size);
if (r < 0)
return log_error_errno(r, "Failed to read root hash signature: %m");
}
r = crypt_activate_by_signed_key(cd, volume, m, l, hash_sig, hash_sig_size, arg_activate_flags);
#else
assert_not_reached();
#endif
} else
r = crypt_activate_by_volume_key(cd, volume, m, l, arg_activate_flags);
if (r < 0)
return log_error_errno(r, "Failed to set up verity device: %m");
} else if (streq(verb, "detach")) {
const char *volume;
volume = argv[2];
if (!filename_is_valid(volume))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
r = crypt_init_by_name(&cd, volume);
if (r == -ENODEV) {
log_info("Volume %s already inactive.", volume);
return 0;
}
if (r < 0)
return log_error_errno(r, "crypt_init_by_name() failed: %m");
cryptsetup_enable_logging(cd);
r = crypt_deactivate(cd, volume);
if (r < 0)
return log_error_errno(r, "Failed to deactivate: %m");
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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