diff options
Diffstat (limited to 'src/veritysetup/veritysetup.c')
| -rw-r--r-- | src/veritysetup/veritysetup.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c new file mode 100644 index 0000000..d73c2d3 --- /dev/null +++ b/src/veritysetup/veritysetup.c @@ -0,0 +1,431 @@ +/* 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 "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); |