/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include "alloc-util.h" #include "cryptsetup-util.h" #include "fileio.h" #include "fstab-util.h" #include "hexdecoct.h" #include "log.h" #include "main-func.h" #include "parse-util.h" #include "path-util.h" #include "pretty-print.h" #include "process-util.h" #include "string-util.h" #include "terminal-util.h" static char *arg_hash = NULL; static bool arg_superblock = true; static int arg_format = 1; static uint64_t arg_data_block_size = 4096; static uint64_t arg_hash_block_size = 4096; static uint64_t arg_data_blocks = 0; static uint64_t arg_hash_offset = 0; static void *arg_salt = NULL; static uint64_t arg_salt_size = 32; static char *arg_uuid = NULL; static uint32_t arg_activate_flags = CRYPT_ACTIVATE_READONLY; static char *arg_fec_what = NULL; static uint64_t arg_fec_offset = 0; static uint64_t arg_fec_roots = 2; static char *arg_root_hash_signature = NULL; STATIC_DESTRUCTOR_REGISTER(arg_hash, freep); STATIC_DESTRUCTOR_REGISTER(arg_salt, freep); STATIC_DESTRUCTOR_REGISTER(arg_uuid, freep); STATIC_DESTRUCTOR_REGISTER(arg_fec_what, freep); 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_block_size(const char *t, uint64_t *size) { uint64_t u; int r; r = parse_size(t, 1024, &u); if (r < 0) return r; if (u < 512 || u > (512 * 1024)) return -ERANGE; if ((u % 512) != 0 || !ISPOWEROF2(u)) return -EINVAL; *size = u; return 0; } 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, "superblock="))) { r = parse_boolean(val); if (r < 0) return log_error_errno(r, "Failed to parse boolean '%s': %m", word); arg_superblock = r; } else if ((val = startswith(word, "format="))) { if (!STR_IN_SET(val, "0", "1")) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "format= expects either 0 (original Chrome OS version) or " "1 (modern version)."); arg_format = val[0] - '0'; } else if ((val = startswith(word, "data-block-size="))) { uint64_t sz; r = parse_block_size(val, &sz); if (r < 0) return log_error_errno(r, "Failed to parse size '%s': %m", word); arg_data_block_size = sz; } else if ((val = startswith(word, "hash-block-size="))) { uint64_t sz; r = parse_block_size(val, &sz); if (r < 0) return log_error_errno(r, "Failed to parse size '%s': %m", word); arg_hash_block_size = sz; } else if ((val = startswith(word, "data-blocks="))) { uint64_t u; r = safe_atou64(val, &u); if (r < 0) return log_error_errno(r, "Failed to parse number '%s': %m", word); arg_data_blocks = u; } else if ((val = startswith(word, "hash-offset="))) { uint64_t off; r = parse_size(val, 1024, &off); if (r < 0) return log_error_errno(r, "Failed to parse offset '%s': %m", word); if (off % 512 != 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "hash-offset= expects a 512-byte aligned value."); arg_hash_offset = off; } else if ((val = startswith(word, "salt="))) { if (!string_is_safe(val)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "salt= is not valid."); if (isempty(val)) { arg_salt = mfree(arg_salt); arg_salt_size = 32; } else if (streq(val, "-")) { arg_salt = mfree(arg_salt); arg_salt_size = 0; } else { size_t l; void *m; r = unhexmem(val, strlen(val), &m, &l); if (r < 0) return log_error_errno(r, "Failed to parse salt '%s': %m", word); free_and_replace(arg_salt, m); arg_salt_size = l; } } else if ((val = startswith(word, "uuid="))) { r = sd_id128_from_string(val, NULL); if (r < 0) return log_error_errno(r, "Failed to parse UUID '%s': %m", word); r = free_and_strdup(&arg_uuid, val); if (r < 0) return log_oom(); } else if ((val = startswith(word, "hash="))) { r = free_and_strdup(&arg_hash, val); if (r < 0) return log_oom(); } else if ((val = startswith(word, "fec-device="))) { _cleanup_free_ char *what = NULL; what = fstab_node_to_udev_node(val); if (!what) return log_oom(); if (!path_is_absolute(what)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-device= expects an absolute path."); if (!path_is_normalized(what)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-device= expects an normalized path."); r = free_and_strdup(&arg_fec_what, what); if (r < 0) return log_oom(); } else if ((val = startswith(word, "fec-offset="))) { uint64_t off; r = parse_size(val, 1024, &off); if (r < 0) return log_error_errno(r, "Failed to parse offset '%s': %m", word); if (off % 512 != 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-offset= expects a 512-byte aligned value."); arg_fec_offset = off; } else if ((val = startswith(word, "fec-roots="))) { uint64_t u; r = safe_atou64(val, &u); if (r < 0) return log_error_errno(r, "Failed to parse number '%s', ignoring: %m", word); if (u < 2 || u > 24) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-rootfs= expects a value between 2 and 24 (including)."); arg_fec_roots = u; } 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; struct crypt_params_verity p = {}; 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"); } if (arg_superblock) { p = (struct crypt_params_verity) { .fec_device = arg_fec_what, .hash_area_offset = arg_hash_offset, .fec_area_offset = arg_fec_offset, .fec_roots = arg_fec_roots, }; r = crypt_load(cd, CRYPT_VERITY, &p); if (r < 0) return log_error_errno(r, "Failed to load verity superblock: %m"); } else { p = (struct crypt_params_verity) { .hash_name = arg_hash, .data_device = data_device, .fec_device = arg_fec_what, .salt = arg_salt, .salt_size = arg_salt_size, .hash_type = arg_format, .data_block_size = arg_data_block_size, .hash_block_size = arg_hash_block_size, .data_size = arg_data_blocks, .hash_area_offset = arg_hash_offset, .fec_area_offset = arg_fec_offset, .fec_roots = arg_fec_roots, .flags = CRYPT_VERITY_NO_HEADER, }; r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, arg_uuid, NULL, 0, &p); if (r < 0) return log_error_errno(r, "Failed to format 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 '%s': %m", volume); } 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() for volume '%s' failed: %m", volume); cryptsetup_enable_logging(cd); r = crypt_deactivate(cd, volume); if (r < 0) return log_error_errno(r, "Failed to deactivate volume '%s': %m", volume); } else return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb); return 0; } DEFINE_MAIN_FUNCTION(run);