diff options
Diffstat (limited to 'src/veritysetup.c')
| -rw-r--r-- | src/veritysetup.c | 567 |
1 files changed, 567 insertions, 0 deletions
diff --git a/src/veritysetup.c b/src/veritysetup.c new file mode 100644 index 0000000..9a02c5b --- /dev/null +++ b/src/veritysetup.c @@ -0,0 +1,567 @@ +/* + * veritysetup - setup cryptographic volumes for dm-verity + * + * Copyright (C) 2012-2019 Red Hat, Inc. All rights reserved. + * Copyright (C) 2012-2019 Milan Broz + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "cryptsetup.h" + +#define PACKAGE_VERITY "veritysetup" + +static int use_superblock = 1; + +static const char *fec_device = NULL; +static int fec_roots = DEFAULT_VERITY_FEC_ROOTS; +static const char *hash_algorithm = NULL; +static int hash_type = 1; +static int data_block_size = DEFAULT_VERITY_DATA_BLOCK; +static int hash_block_size = DEFAULT_VERITY_HASH_BLOCK; +static uint64_t data_blocks = 0; +static const char *salt_string = NULL; +static uint64_t hash_offset = 0; +static uint64_t fec_offset = 0; +static const char *opt_uuid = NULL; +static int opt_restart_on_corruption = 0; +static int opt_ignore_corruption = 0; +static int opt_ignore_zero_blocks = 0; +static int opt_check_at_most_once = 0; + +static int opt_version_mode = 0; + +static const char **action_argv; +static int action_argc; + +static int _prepare_format(struct crypt_params_verity *params, + const char *data_device, + uint32_t flags) +{ + char *salt = NULL; + int len; + + params->hash_name = hash_algorithm ?: DEFAULT_VERITY_HASH; + params->data_device = data_device; + params->fec_device = fec_device; + params->fec_roots = fec_roots; + + if (salt_string && !strcmp(salt_string, "-")) { + params->salt_size = 0; + params->salt = NULL; + } else if (salt_string) { + len = crypt_hex_to_bytes(salt_string, &salt, 0); + if (len < 0) { + log_err(_("Invalid salt string specified.")); + return -EINVAL; + } + params->salt_size = len; + params->salt = salt; + } else { + params->salt_size = DEFAULT_VERITY_SALT_SIZE; + params->salt = NULL; + } + + params->data_block_size = data_block_size; + params->hash_block_size = hash_block_size; + params->data_size = data_blocks; + params->hash_area_offset = hash_offset; + params->fec_area_offset = fec_offset; + params->hash_type = hash_type; + params->flags = flags; + + return 0; +} + +static int action_format(int arg) +{ + struct crypt_device *cd = NULL; + struct crypt_params_verity params = {}; + uint32_t flags = CRYPT_VERITY_CREATE_HASH; + int r; + + /* Try to create hash image if doesn't exist */ + r = open(action_argv[1], O_WRONLY | O_EXCL | O_CREAT, S_IRUSR | S_IWUSR); + if (r < 0 && errno != EEXIST) { + log_err(_("Cannot create hash image %s for writing."), action_argv[1]); + return -EINVAL; + } else if (r >= 0) { + log_dbg("Created hash image %s.", action_argv[1]); + close(r); + } + /* Try to create FEC image if doesn't exist */ + if (fec_device) { + r = open(fec_device, O_WRONLY | O_EXCL | O_CREAT, S_IRUSR | S_IWUSR); + if (r < 0 && errno != EEXIST) { + log_err(_("Cannot create FEC image %s for writing."), fec_device); + return -EINVAL; + } else if (r >= 0) { + log_dbg("Created FEC image %s.", fec_device); + close(r); + } + } + + if ((r = crypt_init(&cd, action_argv[1]))) + goto out; + + if (!use_superblock) + flags |= CRYPT_VERITY_NO_HEADER; + + r = _prepare_format(¶ms, action_argv[0], flags); + if (r < 0) + goto out; + + r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, opt_uuid, NULL, 0, ¶ms); + if (!r) + crypt_dump(cd); +out: + crypt_free(cd); + free(CONST_CAST(char*)params.salt); + return r; +} + +static int _activate(const char *dm_device, + const char *data_device, + const char *hash_device, + const char *root_hash, + uint32_t flags) +{ + struct crypt_device *cd = NULL; + struct crypt_params_verity params = {}; + uint32_t activate_flags = CRYPT_ACTIVATE_READONLY; + char *root_hash_bytes = NULL; + ssize_t hash_size; + int r; + + if ((r = crypt_init_data_device(&cd, hash_device, data_device))) + goto out; + + if (opt_ignore_corruption) + activate_flags |= CRYPT_ACTIVATE_IGNORE_CORRUPTION; + if (opt_restart_on_corruption) + activate_flags |= CRYPT_ACTIVATE_RESTART_ON_CORRUPTION; + if (opt_ignore_zero_blocks) + activate_flags |= CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS; + if (opt_check_at_most_once) + activate_flags |= CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE; + + if (use_superblock) { + params.flags = flags; + params.hash_area_offset = hash_offset; + params.fec_area_offset = fec_offset; + params.fec_device = fec_device; + params.fec_roots = fec_roots; + r = crypt_load(cd, CRYPT_VERITY, ¶ms); + } else { + r = _prepare_format(¶ms, data_device, flags | CRYPT_VERITY_NO_HEADER); + if (r < 0) + goto out; + r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, NULL, NULL, 0, ¶ms); + } + if (r < 0) + goto out; + + hash_size = crypt_get_volume_key_size(cd); + if (crypt_hex_to_bytes(root_hash, &root_hash_bytes, 0) != hash_size) { + log_err(_("Invalid root hash string specified.")); + r = -EINVAL; + goto out; + } + r = crypt_activate_by_volume_key(cd, dm_device, + root_hash_bytes, + hash_size, + activate_flags); +out: + crypt_free(cd); + free(root_hash_bytes); + free(CONST_CAST(char*)params.salt); + return r; +} + +static int action_open(int arg) +{ + return _activate(action_argv[1], + action_argv[0], + action_argv[2], + action_argv[3], 0); +} + +static int action_verify(int arg) +{ + return _activate(NULL, + action_argv[0], + action_argv[1], + action_argv[2], + CRYPT_VERITY_CHECK_HASH); +} + +static int action_close(int arg) +{ + struct crypt_device *cd = NULL; + int r; + + r = crypt_init_by_name(&cd, action_argv[0]); + if (r == 0) + r = crypt_deactivate(cd, action_argv[0]); + + crypt_free(cd); + return r; +} + +static int action_status(int arg) +{ + crypt_status_info ci; + struct crypt_active_device cad; + struct crypt_params_verity vp = {}; + struct crypt_device *cd = NULL; + struct stat st; + char *backing_file; + unsigned i, path = 0; + int r = 0; + + /* perhaps a path, not a dm device name */ + if (strchr(action_argv[0], '/') && !stat(action_argv[0], &st)) + path = 1; + + ci = crypt_status(NULL, action_argv[0]); + switch (ci) { + case CRYPT_INVALID: + r = -EINVAL; + break; + case CRYPT_INACTIVE: + if (path) + log_std("%s is inactive.\n", action_argv[0]); + else + log_std("%s/%s is inactive.\n", crypt_get_dir(), action_argv[0]); + r = -ENODEV; + break; + case CRYPT_ACTIVE: + case CRYPT_BUSY: + if (path) + log_std("%s is active%s.\n", action_argv[0], + ci == CRYPT_BUSY ? " and is in use" : ""); + else + log_std("%s/%s is active%s.\n", crypt_get_dir(), action_argv[0], + ci == CRYPT_BUSY ? " and is in use" : ""); + + r = crypt_init_by_name_and_header(&cd, action_argv[0], NULL); + if (r < 0 || !crypt_get_type(cd)) + goto out; + + log_std(" type: %s\n", crypt_get_type(cd)); + + r = crypt_get_active_device(cd, action_argv[0], &cad); + if (r < 0) + goto out; + + log_std(" status: %s\n", + cad.flags & CRYPT_ACTIVATE_CORRUPTED ? "corrupted" : "verified"); + + r = crypt_get_verity_info(cd, &vp); + if (r < 0) + goto out; + + log_std(" hash type: %u\n", vp.hash_type); + log_std(" data block: %u\n", vp.data_block_size); + log_std(" hash block: %u\n", vp.hash_block_size); + log_std(" hash name: %s\n", vp.hash_name); + log_std(" salt: "); + if (vp.salt_size) + for(i = 0; i < vp.salt_size; i++) + log_std("%02hhx", (const char)vp.salt[i]); + else + log_std("-"); + log_std("\n"); + + log_std(" data device: %s\n", vp.data_device); + if (crypt_loop_device(vp.data_device)) { + backing_file = crypt_loop_backing_file(vp.data_device); + log_std(" data loop: %s\n", backing_file); + free(backing_file); + } + log_std(" size: %" PRIu64 " sectors\n", cad.size); + log_std(" mode: %s\n", cad.flags & CRYPT_ACTIVATE_READONLY ? + "readonly" : "read/write"); + + log_std(" hash device: %s\n", vp.hash_device); + if (crypt_loop_device(vp.hash_device)) { + backing_file = crypt_loop_backing_file(vp.hash_device); + log_std(" hash loop: %s\n", backing_file); + free(backing_file); + } + log_std(" hash offset: %" PRIu64 " sectors\n", + vp.hash_area_offset * vp.hash_block_size / 512); + + if (vp.fec_device) { + log_std(" FEC device: %s\n", vp.fec_device); + if (crypt_loop_device(vp.fec_device)) { + backing_file = crypt_loop_backing_file(vp.fec_device); + log_std(" FEC loop: %s\n", backing_file); + free(backing_file); + } + log_std(" FEC offset: %" PRIu64 " sectors\n", + vp.fec_area_offset * vp.hash_block_size / 512); + log_std(" FEC roots: %u\n", vp.fec_roots); + } + if (cad.flags & (CRYPT_ACTIVATE_IGNORE_CORRUPTION| + CRYPT_ACTIVATE_RESTART_ON_CORRUPTION| + CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS| + CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE)) + log_std(" flags: %s%s%s%s\n", + (cad.flags & CRYPT_ACTIVATE_IGNORE_CORRUPTION) ? "ignore_corruption " : "", + (cad.flags & CRYPT_ACTIVATE_RESTART_ON_CORRUPTION) ? "restart_on_corruption " : "", + (cad.flags & CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS) ? "ignore_zero_blocks " : "", + (cad.flags & CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE) ? "check_at_most_once" : ""); + } +out: + crypt_free(cd); + if (r == -ENOTSUP) + r = 0; + return r; +} + +static int action_dump(int arg) +{ + struct crypt_device *cd = NULL; + struct crypt_params_verity params = {}; + int r; + + if ((r = crypt_init(&cd, action_argv[0]))) + return r; + + params.hash_area_offset = hash_offset; + params.fec_area_offset = fec_offset; + r = crypt_load(cd, CRYPT_VERITY, ¶ms); + if (!r) + crypt_dump(cd); + crypt_free(cd); + return r; +} + +static struct action_type { + const char *type; + int (*handler)(int); + int required_action_argc; + const char *arg_desc; + const char *desc; +} action_types[] = { + { "format", action_format, 2, N_("<data_device> <hash_device>"),N_("format device") }, + { "verify", action_verify, 3, N_("<data_device> <hash_device> <root_hash>"),N_("verify device") }, + { "open", action_open, 4, N_("<data_device> <name> <hash_device> <root_hash>"),N_("open device as <name>") }, + { "close", action_close, 1, N_("<name>"),N_("close device (deactivate and remove mapping)") }, + { "status", action_status, 1, N_("<name>"),N_("show active device status") }, + { "dump", action_dump, 1, N_("<hash_device>"),N_("show on-disk information") }, + { NULL, NULL, 0, NULL, NULL } +}; + +static void help(poptContext popt_context, + enum poptCallbackReason reason __attribute__((unused)), + struct poptOption *key, + const char *arg __attribute__((unused)), + void *data __attribute__((unused))) +{ + struct action_type *action; + + if (key->shortName == '?') { + log_std("%s %s\n", PACKAGE_VERITY, PACKAGE_VERSION); + poptPrintHelp(popt_context, stdout, 0); + log_std(_("\n" + "<action> is one of:\n")); + for(action = action_types; action->type; action++) + log_std("\t%s %s - %s\n", action->type, _(action->arg_desc), _(action->desc)); + log_std(_("\n" + "<name> is the device to create under %s\n" + "<data_device> is the data device\n" + "<hash_device> is the device containing verification data\n" + "<root_hash> hash of the root node on <hash_device>\n"), + crypt_get_dir()); + + log_std(_("\nDefault compiled-in dm-verity parameters:\n" + "\tHash: %s, Data block (bytes): %u, " + "Hash block (bytes): %u, Salt size: %u, Hash format: %u\n"), + DEFAULT_VERITY_HASH, DEFAULT_VERITY_DATA_BLOCK, + DEFAULT_VERITY_HASH_BLOCK, DEFAULT_VERITY_SALT_SIZE, + 1); + exit(EXIT_SUCCESS); + } else + usage(popt_context, EXIT_SUCCESS, NULL, NULL); +} + +static int run_action(struct action_type *action) +{ + int r; + + log_dbg("Running command %s.", action->type); + + r = action->handler(0); + + show_status(r); + return translate_errno(r); +} + +int main(int argc, const char **argv) +{ + static char *popt_tmp; + static const char *null_action_argv[] = {NULL}; + static struct poptOption popt_help_options[] = { + { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL }, + { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL }, + { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL }, + POPT_TABLEEND + }; + static struct poptOption popt_options[] = { + { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL }, + { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL }, + { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL }, + { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL }, + { "no-superblock", 0, POPT_ARG_VAL, &use_superblock, 0, N_("Do not use verity superblock"), NULL }, + { "format", 0, POPT_ARG_INT, &hash_type, 0, N_("Format type (1 - normal, 0 - original Chrome OS)"), N_("number") }, + { "data-block-size", 0, POPT_ARG_INT, &data_block_size, 0, N_("Block size on the data device"), N_("bytes") }, + { "hash-block-size", 0, POPT_ARG_INT, &hash_block_size, 0, N_("Block size on the hash device"), N_("bytes") }, + { "fec-roots", 0, POPT_ARG_INT, &fec_roots, 0, N_("FEC parity bytes"), N_("bytes") }, + { "data-blocks", 0, POPT_ARG_STRING, &popt_tmp, 1, N_("The number of blocks in the data file"), N_("blocks") }, + { "fec-device", 0, POPT_ARG_STRING, &fec_device, 0, N_("Path to device with error correction data"), N_("path") }, + { "hash-offset", 0, POPT_ARG_STRING, &popt_tmp, 2, N_("Starting offset on the hash device"), N_("bytes") }, + { "fec-offset", 0, POPT_ARG_STRING, &popt_tmp, 3, N_("Starting offset on the FEC device"), N_("bytes") }, + { "hash", 'h', POPT_ARG_STRING, &hash_algorithm, 0, N_("Hash algorithm"), N_("string") }, + { "salt", 's', POPT_ARG_STRING, &salt_string, 0, N_("Salt"), N_("hex string") }, + { "uuid", '\0', POPT_ARG_STRING, &opt_uuid, 0, N_("UUID for device to use"), NULL }, + { "restart-on-corruption", 0,POPT_ARG_NONE,&opt_restart_on_corruption, 0, N_("Restart kernel if corruption is detected"), NULL }, + { "ignore-corruption", 0, POPT_ARG_NONE, &opt_ignore_corruption, 0, N_("Ignore corruption, log it only"), NULL }, + { "ignore-zero-blocks", 0, POPT_ARG_NONE, &opt_ignore_zero_blocks, 0, N_("Do not verify zeroed blocks"), NULL }, + { "check-at-most-once", 0, POPT_ARG_NONE, &opt_check_at_most_once, 0, N_("Verify data block only the first time it is read"), NULL }, + POPT_TABLEEND + }; + + poptContext popt_context; + struct action_type *action; + const char *aname; + int r; + + crypt_set_log_callback(NULL, tool_log, NULL); + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + + popt_context = poptGetContext("verity", argc, argv, popt_options, 0); + poptSetOtherOptionHelp(popt_context, + _("[OPTION...] <action> <action-specific>")); + + while((r = poptGetNextOpt(popt_context)) > 0) { + unsigned long long ull_value; + char *endp; + + errno = 0; + ull_value = strtoull(popt_tmp, &endp, 10); + if (*endp || !*popt_tmp || !isdigit(*popt_tmp) || + (errno == ERANGE && ull_value == ULLONG_MAX) || + (errno != 0 && ull_value == 0)) + r = POPT_ERROR_BADNUMBER; + + switch(r) { + case 1: + data_blocks = ull_value; + break; + case 2: + hash_offset = ull_value; + break; + case 3: + fec_offset = ull_value; + break; + } + + if (r < 0) + break; + } + + if (r < -1) + usage(popt_context, EXIT_FAILURE, poptStrerror(r), + poptBadOption(popt_context, POPT_BADOPTION_NOALIAS)); + + if (opt_version_mode) { + log_std("%s %s\n", PACKAGE_VERITY, PACKAGE_VERSION); + poptFreeContext(popt_context); + exit(EXIT_SUCCESS); + } + + if (!(aname = poptGetArg(popt_context))) + usage(popt_context, EXIT_FAILURE, _("Argument <action> missing."), + poptGetInvocationName(popt_context)); + + action_argc = 0; + action_argv = poptGetArgs(popt_context); + /* Make return values of poptGetArgs more consistent in case of remaining argc = 0 */ + if(!action_argv) + action_argv = null_action_argv; + + /* Count args, somewhat unnice, change? */ + while(action_argv[action_argc] != NULL) + action_argc++; + + /* Handle aliases */ + if (!strcmp(aname, "create") && action_argc > 1) { + /* create command had historically switched arguments */ + if (action_argv[0] && action_argv[1]) { + const char *tmp = action_argv[0]; + action_argv[0] = action_argv[1]; + action_argv[1] = tmp; + } + aname = "open"; + } else if (!strcmp(aname, "remove")) { + aname = "close"; + } + + for (action = action_types; action->type; action++) + if (strcmp(action->type, aname) == 0) + break; + + if (!action->type) + usage(popt_context, EXIT_FAILURE, _("Unknown action."), + poptGetInvocationName(popt_context)); + + if (action_argc < action->required_action_argc) { + char buf[128]; + snprintf(buf, 128,_("%s: requires %s as arguments"), action->type, action->arg_desc); + usage(popt_context, EXIT_FAILURE, buf, + poptGetInvocationName(popt_context)); + } + + if (data_block_size < 0 || hash_block_size < 0 || hash_type < 0) { + usage(popt_context, EXIT_FAILURE, + _("Negative number for option not permitted."), + poptGetInvocationName(popt_context)); + } + + if ((opt_ignore_corruption || opt_restart_on_corruption || opt_ignore_zero_blocks) && strcmp(aname, "open")) + usage(popt_context, EXIT_FAILURE, + _("Option --ignore-corruption, --restart-on-corruption or --ignore-zero-blocks is allowed only for open operation.\n"), + poptGetInvocationName(popt_context)); + + if (opt_ignore_corruption && opt_restart_on_corruption) + usage(popt_context, EXIT_FAILURE, + _("Option --ignore-corruption and --restart-on-corruption cannot be used together.\n"), + poptGetInvocationName(popt_context)); + + if (opt_debug) { + opt_verbose = 1; + crypt_set_debug_level(-1); + dbg_version_and_cmd(argc, argv); + } + + r = run_action(action); + poptFreeContext(popt_context); + return r; +} |