diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:44:12 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:44:12 +0000 |
commit | 1be69c2c660b70ac2f4de2a5326e27e3e60eb82d (patch) | |
tree | bb299ab6f411f4fccd735907035de710e4ec6abc /src/cryptsetup_reencrypt.c | |
parent | Initial commit. (diff) | |
download | cryptsetup-1be69c2c660b70ac2f4de2a5326e27e3e60eb82d.tar.xz cryptsetup-1be69c2c660b70ac2f4de2a5326e27e3e60eb82d.zip |
Adding upstream version 2:2.3.7.upstream/2%2.3.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/cryptsetup_reencrypt.c | 1790 |
1 files changed, 1790 insertions, 0 deletions
diff --git a/src/cryptsetup_reencrypt.c b/src/cryptsetup_reencrypt.c new file mode 100644 index 0000000..27a24d9 --- /dev/null +++ b/src/cryptsetup_reencrypt.c @@ -0,0 +1,1790 @@ +/* + * cryptsetup-reencrypt - crypt utility for offline re-encryption + * + * Copyright (C) 2012-2021 Red Hat, Inc. All rights reserved. + * Copyright (C) 2012-2021 Milan Broz All rights reserved. + * + * 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" +#include <sys/ioctl.h> +#include <linux/fs.h> +#include <arpa/inet.h> +#include <uuid/uuid.h> + +#define PACKAGE_REENC "cryptsetup-reencrypt" + +#define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee" + +static char *opt_cipher = NULL; +static char *opt_hash = NULL; +static char *opt_key_file = NULL; +static char *opt_master_key_file = NULL; +static char *opt_uuid = NULL; +static char *opt_type = NULL; +static char *opt_pbkdf = NULL; +static char *opt_header_device = NULL; + +/* helper strings converted to uint64_t later */ +static char *opt_reduce_size_str = NULL; +static char *opt_device_size_str = NULL; + +static uint64_t opt_reduce_size = 0; +static uint64_t opt_device_size = 0; + +static long opt_keyfile_size = 0; +static long opt_keyfile_offset = 0; +static int opt_iteration_time = 0; +static long opt_pbkdf_memory = DEFAULT_LUKS2_MEMORY_KB; +static long opt_pbkdf_parallel = DEFAULT_LUKS2_PARALLEL_THREADS; +static long opt_pbkdf_iterations = 0; +static int opt_random = 0; +static int opt_urandom = 0; +static int opt_bsize = 4; +static int opt_directio = 0; +static int opt_fsync = 0; +static int opt_write_log = 0; +static int opt_tries = 3; +static int opt_key_slot = CRYPT_ANY_SLOT; +static int opt_key_size = 0; +static int opt_new = 0; +static int opt_keep_key = 0; +static int opt_decrypt = 0; + +static const char **action_argv; + +static const char *set_pbkdf = NULL; + +#define MAX_SLOT 32 +#define MAX_TOKEN 32 +struct reenc_ctx { + char *device; + char *device_header; + char *device_uuid; + const char *type; + uint64_t device_size; /* overridden by parameter */ + uint64_t device_size_new_real; + uint64_t device_size_org_real; + uint64_t device_offset; + uint64_t device_shift; + uint64_t data_offset; + + unsigned int stained:1; + unsigned int in_progress:1; + enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction; + enum { REENCRYPT = 0, ENCRYPT = 1, DECRYPT = 2 } reencrypt_mode; + + char header_file_org[PATH_MAX]; + char header_file_tmp[PATH_MAX]; + char header_file_new[PATH_MAX]; + char log_file[PATH_MAX]; + + char crypt_path_org[PATH_MAX]; + char crypt_path_new[PATH_MAX]; + int log_fd; + char log_buf[SECTOR_SIZE]; + + struct { + char *password; + size_t passwordLen; + } p[MAX_SLOT]; + int keyslot; + + uint64_t resume_bytes; +}; + +char MAGIC[] = {'L','U','K','S', 0xba, 0xbe}; +char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad}; +int MAGIC_L = 6; + +typedef enum { + MAKE_UNUSABLE, + MAKE_USABLE, + CHECK_UNUSABLE, + CHECK_OPEN, +} header_magic; + +void tools_cleanup(void) +{ + FREE_AND_NULL(opt_cipher); + FREE_AND_NULL(opt_hash); + FREE_AND_NULL(opt_key_file); + FREE_AND_NULL(opt_master_key_file); + FREE_AND_NULL(opt_uuid); + FREE_AND_NULL(opt_type); + FREE_AND_NULL(opt_pbkdf); + FREE_AND_NULL(opt_header_device); + FREE_AND_NULL(opt_reduce_size_str); + FREE_AND_NULL(opt_device_size_str); +} + +static void _quiet_log(int level, const char *msg, void *usrptr) +{ + if (!opt_debug) + return; + tool_log(level, msg, usrptr); +} + +static int alignment(int fd) +{ + int alignment; + + alignment = fpathconf(fd, _PC_REC_XFER_ALIGN); + if (alignment < 0) + alignment = 4096; + return alignment; +} + +static size_t pagesize(void) +{ + long r = sysconf(_SC_PAGESIZE); + return r < 0 ? 4096 : (size_t)r; +} + +static const char *luksType(const char *type) +{ + if (type && !strcmp(type, "luks2")) + return CRYPT_LUKS2; + + if (type && !strcmp(type, "luks1")) + return CRYPT_LUKS1; + + if (!type || !strcmp(type, "luks")) + return crypt_get_default_type(); + + return NULL; +} + +static const char *hdr_device(const struct reenc_ctx *rc) +{ + return rc->device_header ?: rc->device; +} + +static int set_reencrypt_requirement(const struct reenc_ctx *rc) +{ + uint32_t reqs; + int r = -EINVAL; + struct crypt_device *cd = NULL; + struct crypt_params_integrity ip = { 0 }; + + if (crypt_init(&cd, hdr_device(rc)) || + crypt_load(cd, CRYPT_LUKS2, NULL) || + crypt_persistent_flags_get(cd, CRYPT_FLAGS_REQUIREMENTS, &reqs)) + goto out; + + /* reencrypt already in-progress */ + if (reqs & CRYPT_REQUIREMENT_OFFLINE_REENCRYPT) { + log_err(_("Reencryption already in-progress.")); + goto out; + } + + /* raw integrity info is available since 2.0 */ + if (crypt_get_integrity_info(cd, &ip) || ip.tag_size) { + log_err(_("Reencryption of device with integrity profile is not supported.")); + r = -ENOTSUP; + goto out; + } + + r = crypt_persistent_flags_set(cd, CRYPT_FLAGS_REQUIREMENTS, reqs | CRYPT_REQUIREMENT_OFFLINE_REENCRYPT); +out: + crypt_free(cd); + return r; +} + +/* Depends on the first two fields of LUKS1 header format, magic and version */ +static int device_check(struct reenc_ctx *rc, const char *device, header_magic set_magic) +{ + char *buf = NULL; + int r, devfd; + ssize_t s; + uint16_t version; + size_t buf_size = pagesize(); + struct stat st; + + if (stat(device, &st)) { + log_err(_("Cannot open device %s."), device); + return -EINVAL; + } + + /* coverity[toctou] */ + devfd = open(device, O_RDWR | (S_ISBLK(st.st_mode) ? O_EXCL : 0)); + if (devfd == -1) { + if (errno == EBUSY) { + log_err(_("Cannot exclusively open %s, device in use."), + device); + return -EBUSY; + } + log_err(_("Cannot open device %s."), device); + return -EINVAL; + } + + if (set_magic == CHECK_OPEN) { + r = 0; + goto out; + } + + if (posix_memalign((void *)&buf, alignment(devfd), buf_size)) { + log_err(_("Allocation of aligned memory failed.")); + r = -ENOMEM; + goto out; + } + + s = read(devfd, buf, buf_size); + if (s < 0 || s != (ssize_t)buf_size) { + log_err(_("Cannot read device %s."), device); + r = -EIO; + goto out; + } + + /* Be sure that we do not process new version of header */ + memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t)); + version = ntohs(version); + + if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) && + version == 1) { + log_verbose(_("Marking LUKS1 device %s unusable."), device); + memcpy(buf, NOMAGIC, MAGIC_L); + r = 0; + } else if (set_magic == MAKE_UNUSABLE && version == 2) { + log_verbose(_("Setting LUKS2 offline reencrypt flag on device %s."), device); + r = set_reencrypt_requirement(rc); + if (!r) + rc->stained = 1; + } else if (set_magic == CHECK_UNUSABLE && version == 1) { + r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0; + if (!r) + rc->device_uuid = strndup(&buf[0xa8], 40); + goto out; + } else + r = -EINVAL; + + if (!r && version == 1) { + if (lseek(devfd, 0, SEEK_SET) == -1) + goto out; + s = write(devfd, buf, buf_size); + if (s < 0 || s != (ssize_t)buf_size || fsync(devfd) < 0) { + log_err(_("Cannot write device %s."), device); + r = -EIO; + } + if (s > 0 && set_magic == MAKE_UNUSABLE) + rc->stained = 1; + } + if (r) + log_dbg("LUKS signature check failed for %s.", device); +out: + if (buf) + memset(buf, 0, buf_size); + free(buf); + close(devfd); + return r; +} + +static int create_empty_header(const char *new_file) +{ + int fd, r = 0; + + log_dbg("Creating empty file %s of size 4096.", new_file); + + /* coverity[toctou] */ + fd = open(new_file, O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IWUSR); + if (fd == -1 || posix_fallocate(fd, 0, 4096)) + r = -EINVAL; + if (fd >= 0) + close(fd); + + return r; +} + +static int write_log(struct reenc_ctx *rc) +{ + ssize_t r; + + memset(rc->log_buf, 0, SECTOR_SIZE); + snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n" + "version = %d\nUUID = %s\ndirection = %d\nmode = %d\n" + "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n", + 2, rc->device_uuid, rc->reencrypt_direction, rc->reencrypt_mode, + rc->device_offset, rc->device_shift); + + if (lseek(rc->log_fd, 0, SEEK_SET) == -1) + return -EIO; + + r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE); + if (r < 0 || r != SECTOR_SIZE) { + log_err(_("Cannot write reencryption log file.")); + return -EIO; + } + + return 0; +} + +static int parse_line_log(struct reenc_ctx *rc, const char *line) +{ + uint64_t u64; + int i; + char s[64]; + + /* whole line is comment */ + if (*line == '#') + return 0; + + if (sscanf(line, "version = %d", &i) == 1) { + if (i < 1 || i > 2) { + log_dbg("Log: Unexpected version = %i", i); + return -EINVAL; + } + } else if (sscanf(line, "UUID = %40s", s) == 1) { + if (!rc->device_uuid || strcmp(rc->device_uuid, s)) { + log_dbg("Log: Unexpected UUID %s", s); + return -EINVAL; + } + } else if (sscanf(line, "direction = %d", &i) == 1) { + log_dbg("Log: direction = %i", i); + rc->reencrypt_direction = i; + } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) { + log_dbg("Log: offset = %" PRIu64, u64); + rc->device_offset = u64; + } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) { + log_dbg("Log: shift = %" PRIu64, u64); + rc->device_shift = u64; + } else if (sscanf(line, "mode = %d", &i) == 1) { /* added in v2 */ + log_dbg("Log: mode = %i", i); + rc->reencrypt_mode = i; + if (rc->reencrypt_mode != REENCRYPT && + rc->reencrypt_mode != ENCRYPT && + rc->reencrypt_mode != DECRYPT) + return -EINVAL; + } else + return -EINVAL; + + return 0; +} + +static int parse_log(struct reenc_ctx *rc) +{ + char *start, *end; + ssize_t s; + + s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE); + if (s == -1) { + log_err(_("Cannot read reencryption log file.")); + return -EIO; + } + + rc->log_buf[SECTOR_SIZE - 1] = '\0'; + start = rc->log_buf; + do { + end = strchr(start, '\n'); + if (end) { + *end++ = '\0'; + if (parse_line_log(rc, start)) { + log_err("Wrong log format."); + return -EINVAL; + } + } + + start = end; + } while (start); + + return 0; +} + +static void close_log(struct reenc_ctx *rc) +{ + log_dbg("Closing LUKS reencryption log file %s.", rc->log_file); + if (rc->log_fd != -1) + close(rc->log_fd); +} + +static int open_log(struct reenc_ctx *rc) +{ + int flags = opt_fsync ? O_SYNC : 0; + + rc->log_fd = open(rc->log_file, O_RDWR|O_EXCL|O_CREAT|flags, S_IRUSR|S_IWUSR); + if (rc->log_fd != -1) { + log_dbg("Created LUKS reencryption log file %s.", rc->log_file); + rc->stained = 0; + } else if (errno == EEXIST) { + log_std(_("Log file %s exists, resuming reencryption.\n"), rc->log_file); + rc->log_fd = open(rc->log_file, O_RDWR|flags); + rc->in_progress = 1; + } + + if (rc->log_fd == -1) + return -EINVAL; + + if (!rc->in_progress && write_log(rc) < 0) { + close_log(rc); + return -EIO; + } + + /* Be sure it is correct format */ + return parse_log(rc); +} + +static int activate_luks_headers(struct reenc_ctx *rc) +{ + struct crypt_device *cd = NULL, *cd_new = NULL; + const char *pwd_old, *pwd_new, pwd_empty[] = ""; + size_t pwd_old_len, pwd_new_len; + int r; + + log_dbg("Activating LUKS devices from headers."); + + /* Never use real password for empty header processing */ + if (rc->reencrypt_mode == REENCRYPT) { + pwd_old = rc->p[rc->keyslot].password; + pwd_old_len = rc->p[rc->keyslot].passwordLen; + pwd_new = pwd_old; + pwd_new_len = pwd_old_len; + } else if (rc->reencrypt_mode == DECRYPT) { + pwd_old = rc->p[rc->keyslot].password; + pwd_old_len = rc->p[rc->keyslot].passwordLen; + pwd_new = pwd_empty; + pwd_new_len = 0; + } else if (rc->reencrypt_mode == ENCRYPT) { + pwd_old = pwd_empty; + pwd_old_len = 0; + pwd_new = rc->p[rc->keyslot].password; + pwd_new_len = rc->p[rc->keyslot].passwordLen; + } else + return -EINVAL; + + if ((r = crypt_init_data_device(&cd, rc->header_file_org, rc->device)) || + (r = crypt_load(cd, CRYPT_LUKS, NULL))) + goto out; + + log_verbose(_("Activating temporary device using old LUKS header.")); + if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org, + opt_key_slot, pwd_old, pwd_old_len, + CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0) + goto out; + + if ((r = crypt_init_data_device(&cd_new, rc->header_file_new, rc->device)) || + (r = crypt_load(cd_new, CRYPT_LUKS, NULL))) + goto out; + + log_verbose(_("Activating temporary device using new LUKS header.")); + if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new, + opt_key_slot, pwd_new, pwd_new_len, + CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0) + goto out; + r = 0; +out: + crypt_free(cd); + crypt_free(cd_new); + if (r < 0) + log_err(_("Activation of temporary devices failed.")); + return r; +} + +static int set_pbkdf_params(struct crypt_device *cd, const char *dev_type) +{ + const struct crypt_pbkdf_type *pbkdf_default; + struct crypt_pbkdf_type pbkdf = {}; + + pbkdf_default = crypt_get_pbkdf_default(dev_type); + if (!pbkdf_default) + return -EINVAL; + + pbkdf.type = set_pbkdf ?: pbkdf_default->type; + pbkdf.hash = opt_hash ?: pbkdf_default->hash; + pbkdf.time_ms = (uint32_t)opt_iteration_time ?: pbkdf_default->time_ms; + if (strcmp(pbkdf.type, CRYPT_KDF_PBKDF2)) { + pbkdf.max_memory_kb = (uint32_t)opt_pbkdf_memory ?: pbkdf_default->max_memory_kb; + pbkdf.parallel_threads = (uint32_t)opt_pbkdf_parallel ?: pbkdf_default->parallel_threads; + } + + if (opt_pbkdf_iterations) { + pbkdf.iterations = opt_pbkdf_iterations; + pbkdf.time_ms = 0; + pbkdf.flags |= CRYPT_PBKDF_NO_BENCHMARK; + } + + return crypt_set_pbkdf_type(cd, &pbkdf); +} + +static int create_new_keyslot(struct reenc_ctx *rc, int keyslot, + struct crypt_device *cd_old, + struct crypt_device *cd_new) +{ + int r; + char *key = NULL; + size_t key_size; + + if (cd_old && crypt_keyslot_status(cd_old, keyslot) == CRYPT_SLOT_UNBOUND) { + key_size = 4096; + key = crypt_safe_alloc(key_size); + if (!key) + return -ENOMEM; + r = crypt_volume_key_get(cd_old, keyslot, key, &key_size, + rc->p[keyslot].password, rc->p[keyslot].passwordLen); + if (r == keyslot) { + r = crypt_keyslot_add_by_key(cd_new, keyslot, key, key_size, + rc->p[keyslot].password, rc->p[keyslot].passwordLen, + CRYPT_VOLUME_KEY_NO_SEGMENT); + } else + r = -EINVAL; + crypt_safe_free(key); + } else + r = crypt_keyslot_add_by_volume_key(cd_new, keyslot, NULL, 0, + rc->p[keyslot].password, rc->p[keyslot].passwordLen); + + return r; +} + +static int create_new_header(struct reenc_ctx *rc, struct crypt_device *cd_old, + const char *cipher, const char *cipher_mode, + const char *uuid, + const char *key, int key_size, + const char *type, + uint64_t metadata_size, + uint64_t keyslots_size, + void *params) +{ + struct crypt_device *cd_new = NULL; + int i, r; + + if ((r = crypt_init(&cd_new, rc->header_file_new))) + goto out; + + if (opt_random) + crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM); + else if (opt_urandom) + crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM); + + r = set_pbkdf_params(cd_new, type); + if (r) { + log_err(_("Failed to set pbkdf parameters.")); + goto out; + } + + r = crypt_set_data_offset(cd_new, rc->data_offset); + if (r) { + log_err(_("Failed to set data offset.")); + goto out; + } + + r = crypt_set_metadata_size(cd_new, metadata_size, keyslots_size); + if (r) { + log_err(_("Failed to set metadata size.")); + goto out; + } + + r = crypt_format(cd_new, type, cipher, cipher_mode, uuid, key, key_size, params); + check_signal(&r); + if (r < 0) + goto out; + log_verbose(_("New LUKS header for device %s created."), rc->device); + + for (i = 0; i < crypt_keyslot_max(type); i++) { + if (!rc->p[i].password) + continue; + + r = create_new_keyslot(rc, i, cd_old, cd_new); + check_signal(&r); + if (r < 0) + goto out; + tools_keyslot_msg(r, CREATED); + r = 0; + } +out: + crypt_free(cd_new); + return r; +} + +static int isLUKS2(const char *type) +{ + return (type && !strcmp(type, CRYPT_LUKS2)); +} + +static int luks2_metadata_copy(struct reenc_ctx *rc) +{ + const char *json, *type; + crypt_token_info ti; + uint32_t flags; + int i, r = -EINVAL; + struct crypt_device *cd_old = NULL, *cd_new = NULL; + + if (crypt_init(&cd_old, rc->header_file_tmp) || + crypt_load(cd_old, CRYPT_LUKS2, NULL)) + goto out; + + if (crypt_init(&cd_new, rc->header_file_new) || + crypt_load(cd_new, CRYPT_LUKS2, NULL)) + goto out; + + /* + * we have to erase keyslots missing in new header so that we can + * transfer tokens from old header to new one + */ + for (i = 0; i < crypt_keyslot_max(CRYPT_LUKS2); i++) + if (!rc->p[i].password && crypt_keyslot_status(cd_old, i) == CRYPT_SLOT_ACTIVE) { + r = crypt_keyslot_destroy(cd_old, i); + if (r < 0) + goto out; + } + + for (i = 0; i < MAX_TOKEN; i++) { + ti = crypt_token_status(cd_old, i, &type); + switch (ti) { + case CRYPT_TOKEN_INVALID: + log_dbg("Internal error."); + r = -EINVAL; + goto out; + case CRYPT_TOKEN_INACTIVE: + break; + case CRYPT_TOKEN_INTERNAL_UNKNOWN: + log_err(_("This version of cryptsetup-reencrypt can't handle new internal token type %s."), type); + r = -EINVAL; + goto out; + case CRYPT_TOKEN_INTERNAL: + /* fallthrough */ + case CRYPT_TOKEN_EXTERNAL: + /* fallthrough */ + case CRYPT_TOKEN_EXTERNAL_UNKNOWN: + if (crypt_token_json_get(cd_old, i, &json) != i) { + log_dbg("Failed to get %s token (%d).", type, i); + r = -EINVAL; + goto out; + } + if (crypt_token_json_set(cd_new, i, json) != i) { + log_dbg("Failed to create %s token (%d).", type, i); + r = -EINVAL; + goto out; + } + } + } + + if ((r = crypt_persistent_flags_get(cd_old, CRYPT_FLAGS_ACTIVATION, &flags))) { + log_err(_("Failed to read activation flags from backup header.")); + goto out; + } + if ((r = crypt_persistent_flags_set(cd_new, CRYPT_FLAGS_ACTIVATION, flags))) { + log_err(_("Failed to write activation flags to new header.")); + goto out; + } + if ((r = crypt_persistent_flags_get(cd_old, CRYPT_FLAGS_REQUIREMENTS, &flags))) { + log_err(_("Failed to read requirements from backup header.")); + goto out; + } + if ((r = crypt_persistent_flags_set(cd_new, CRYPT_FLAGS_REQUIREMENTS, flags))) + log_err(_("Failed to read requirements from backup header.")); +out: + crypt_free(cd_old); + crypt_free(cd_new); + unlink(rc->header_file_tmp); + + return r; +} + +static int backup_luks_headers(struct reenc_ctx *rc) +{ + struct crypt_device *cd = NULL; + struct crypt_params_luks1 params = {0}; + struct crypt_params_luks2 params2 = {0}; + struct stat st; + char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN]; + char *key = NULL; + size_t key_size; + uint64_t mdata_size = 0, keyslots_size = 0; + int r; + + log_dbg("Creating LUKS header backup for device %s.", hdr_device(rc)); + + if ((r = crypt_init(&cd, hdr_device(rc))) || + (r = crypt_load(cd, CRYPT_LUKS, NULL))) + goto out; + + if ((r = crypt_header_backup(cd, CRYPT_LUKS, rc->header_file_org))) + goto out; + if (isLUKS2(rc->type)) { + if ((r = crypt_header_backup(cd, CRYPT_LUKS2, rc->header_file_tmp))) + goto out; + if ((r = stat(rc->header_file_tmp, &st))) + goto out; + /* coverity[toctou] */ + if ((r = chmod(rc->header_file_tmp, st.st_mode | S_IWUSR))) + goto out; + } + log_verbose(_("%s header backup of device %s created."), isLUKS2(rc->type) ? "LUKS2" : "LUKS1", rc->device); + + /* For decrypt, new header will be fake one, so we are done here. */ + if (rc->reencrypt_mode == DECRYPT) + goto out; + + rc->data_offset = crypt_get_data_offset(cd) + ROUND_SECTOR(opt_reduce_size); + + if ((r = create_empty_header(rc->header_file_new))) + goto out; + + params.hash = opt_hash ?: DEFAULT_LUKS1_HASH; + params2.data_device = params.data_device = rc->device; + params2.sector_size = crypt_get_sector_size(cd); + + if (opt_cipher) { + r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode); + if (r < 0) { + log_err(_("No known cipher specification pattern detected.")); + goto out; + } + } + + key_size = opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd); + + if (opt_keep_key) { + log_dbg("Keeping key from old header."); + key_size = crypt_get_volume_key_size(cd); + key = crypt_safe_alloc(key_size); + if (!key) { + r = -ENOMEM; + goto out; + } + r = crypt_volume_key_get(cd, CRYPT_ANY_SLOT, key, &key_size, + rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen); + } else if (opt_master_key_file) { + log_dbg("Loading new key from file."); + r = tools_read_mk(opt_master_key_file, &key, key_size); + } + + if (r < 0) + goto out; + + if (isLUKS2(crypt_get_type(cd)) && crypt_get_metadata_size(cd, &mdata_size, &keyslots_size)) + goto out; + + r = create_new_header(rc, cd, + opt_cipher ? cipher : crypt_get_cipher(cd), + opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd), + crypt_get_uuid(cd), + key, + key_size, + rc->type, + mdata_size, + keyslots_size, + isLUKS2(rc->type) ? (void*)¶ms2 : (void*)¶ms); + + if (!r && isLUKS2(rc->type)) + r = luks2_metadata_copy(rc); +out: + crypt_free(cd); + crypt_safe_free(key); + if (r) + log_err(_("Creation of LUKS backup headers failed.")); + return r; +} + +/* Create fake header for original device */ +static int backup_fake_header(struct reenc_ctx *rc) +{ + struct crypt_device *cd_new = NULL; + struct crypt_params_luks1 params = {0}; + struct crypt_params_luks2 params2 = {0}; + char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN]; + const char *header_file_fake; + int r; + + log_dbg("Creating fake (cipher_null) header for %s device.", + (rc->reencrypt_mode == DECRYPT) ? "new" : "original"); + + header_file_fake = (rc->reencrypt_mode == DECRYPT) ? rc->header_file_new : rc->header_file_org; + + if (!opt_key_size) + opt_key_size = DEFAULT_LUKS1_KEYBITS; + + if (opt_cipher) { + r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode); + if (r < 0) { + log_err(_("No known cipher specification pattern detected.")); + goto out; + } + } + + r = create_empty_header(header_file_fake); + if (r < 0) + return r; + + params.hash = opt_hash ?: DEFAULT_LUKS1_HASH; + params2.data_alignment = params.data_alignment = 0; + params2.data_device = params.data_device = rc->device; + params2.sector_size = crypt_get_sector_size(NULL); + params2.pbkdf = crypt_get_pbkdf_default(CRYPT_LUKS2); + + r = crypt_init(&cd_new, header_file_fake); + if (r < 0) + return r; + + r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb", + NO_UUID, NULL, opt_key_size / 8, ¶ms); + check_signal(&r); + if (r < 0) + goto out; + + r = crypt_keyslot_add_by_volume_key(cd_new, rc->keyslot, NULL, 0, + rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen); + check_signal(&r); + if (r < 0) + goto out; + + /* The real header is backup header created in backup_luks_headers() */ + if (rc->reencrypt_mode == DECRYPT) { + r = 0; + goto out; + } + + r = create_empty_header(rc->header_file_new); + if (r < 0) + goto out; + + params2.data_alignment = params.data_alignment = ROUND_SECTOR(opt_reduce_size); + r = create_new_header(rc, NULL, + opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER, + opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE, + NULL, NULL, + (opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8, + rc->type, + 0, + 0, + isLUKS2(rc->type) ? (void*)¶ms2 : (void*)¶ms); +out: + crypt_free(cd_new); + return r; +} + +static void remove_headers(struct reenc_ctx *rc) +{ + struct crypt_device *cd = NULL; + + log_dbg("Removing headers."); + + if (crypt_init(&cd, NULL)) + return; + crypt_set_log_callback(cd, _quiet_log, NULL); + if (*rc->header_file_org) + (void)crypt_deactivate(cd, rc->header_file_org); + if (*rc->header_file_new) + (void)crypt_deactivate(cd, rc->header_file_new); + crypt_free(cd); +} + +static int restore_luks_header(struct reenc_ctx *rc) +{ + struct stat st; + struct crypt_device *cd = NULL; + int fd, r; + + log_dbg("Restoring header for %s from %s.", hdr_device(rc), rc->header_file_new); + + /* + * For new encryption and new detached header in file just move it. + * For existing file try to ensure we have preallocated space for restore. + */ + if (opt_new && rc->device_header) { + r = stat(rc->device_header, &st); + if (r == -1) { + r = rename(rc->header_file_new, rc->device_header); + goto out; + } else if ((st.st_mode & S_IFMT) == S_IFREG && + stat(rc->header_file_new, &st) != -1) { + /* coverity[toctou] */ + fd = open(rc->device_header, O_WRONLY); + if (fd != -1) { + if (posix_fallocate(fd, 0, st.st_size)) {}; + close(fd); + } + } + } + + r = crypt_init(&cd, hdr_device(rc)); + if (r == 0) { + r = crypt_header_restore(cd, rc->type, rc->header_file_new); + } + + crypt_free(cd); +out: + if (r) + log_err(_("Cannot restore %s header on device %s."), isLUKS2(rc->type) ? "LUKS2" : "LUKS1", hdr_device(rc)); + else { + log_verbose(_("%s header on device %s restored."), isLUKS2(rc->type) ? "LUKS2" : "LUKS1", hdr_device(rc)); + rc->stained = 0; + } + return r; +} + +static ssize_t read_buf(int fd, void *buf, size_t count) +{ + size_t read_size = 0; + ssize_t s; + + do { + /* This expects that partial read is aligned in buffer */ + s = read(fd, buf, count - read_size); + if (s == -1 && errno != EINTR) + return s; + if (s == 0) + return (ssize_t)read_size; + if (s > 0) { + if (s != (ssize_t)count) + log_dbg("Partial read %zd / %zu.", s, count); + read_size += (size_t)s; + buf = (uint8_t*)buf + s; + } + } while (read_size != count); + + return (ssize_t)count; +} + +static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new, + size_t block_size, void *buf, uint64_t *bytes) +{ + ssize_t s1, s2; + + log_dbg("Reencrypting in forward direction."); + + if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 || + lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) { + log_err(_("Cannot seek to device offset.")); + return -EIO; + } + + rc->resume_bytes = *bytes = rc->device_offset; + + tools_reencrypt_progress(rc->device_size, *bytes, NULL); + + if (write_log(rc) < 0) + return -EIO; + + while (!quit && rc->device_offset < rc->device_size) { + s1 = read_buf(fd_old, buf, block_size); + if (s1 < 0 || ((size_t)s1 != block_size && + (rc->device_offset + s1) != rc->device_size)) { + log_dbg("Read error, expecting %zu, got %zd.", + block_size, s1); + return -EIO; + } + + /* If device_size is forced, never write more than limit */ + if ((s1 + rc->device_offset) > rc->device_size) + s1 = rc->device_size - rc->device_offset; + + s2 = write(fd_new, buf, s1); + if (s2 < 0) { + log_dbg("Write error, expecting %zu, got %zd.", + block_size, s2); + return -EIO; + } + + rc->device_offset += s1; + if (opt_write_log && write_log(rc) < 0) + return -EIO; + + if (opt_fsync && fsync(fd_new) < 0) { + log_dbg("Write error, fsync."); + return -EIO; + } + + *bytes += (uint64_t)s2; + + tools_reencrypt_progress(rc->device_size, *bytes, NULL); + } + + return quit ? -EAGAIN : 0; +} + +static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new, + size_t block_size, void *buf, uint64_t *bytes) +{ + ssize_t s1, s2, working_block; + off64_t working_offset; + + log_dbg("Reencrypting in backward direction."); + + if (!rc->in_progress) { + rc->device_offset = rc->device_size; + rc->resume_bytes = 0; + *bytes = 0; + } else { + rc->resume_bytes = rc->device_size - rc->device_offset; + *bytes = rc->resume_bytes; + } + + tools_reencrypt_progress(rc->device_size, *bytes, NULL); + + if (write_log(rc) < 0) + return -EIO; + + /* dirty the device during ENCRYPT mode */ + rc->stained = 1; + + while (!quit && rc->device_offset) { + if (rc->device_offset < block_size) { + working_offset = 0; + working_block = rc->device_offset; + } else { + working_offset = rc->device_offset - block_size; + working_block = block_size; + } + + if (lseek64(fd_old, working_offset, SEEK_SET) < 0 || + lseek64(fd_new, working_offset, SEEK_SET) < 0) { + log_err(_("Cannot seek to device offset.")); + return -EIO; + } + + s1 = read_buf(fd_old, buf, working_block); + if (s1 < 0 || (s1 != working_block)) { + log_dbg("Read error, expecting %zu, got %zd.", + block_size, s1); + return -EIO; + } + + s2 = write(fd_new, buf, working_block); + if (s2 < 0) { + log_dbg("Write error, expecting %zu, got %zd.", + block_size, s2); + return -EIO; + } + + rc->device_offset -= s1; + if (opt_write_log && write_log(rc) < 0) + return -EIO; + + if (opt_fsync && fsync(fd_new) < 0) { + log_dbg("Write error, fsync."); + return -EIO; + } + + *bytes += (uint64_t)s2; + + tools_reencrypt_progress(rc->device_size, *bytes, NULL); + } + + return quit ? -EAGAIN : 0; +} + +static void zero_rest_of_device(int fd, size_t block_size, void *buf, + uint64_t *bytes, uint64_t offset) +{ + ssize_t s1, s2; + + log_dbg("Zeroing rest of device."); + + if (lseek64(fd, offset, SEEK_SET) < 0) { + log_dbg("Cannot seek to device offset."); + return; + } + + memset(buf, 0, block_size); + s1 = block_size; + + while (!quit && *bytes) { + if (*bytes < (uint64_t)s1) + s1 = *bytes; + + s2 = write(fd, buf, s1); + if (s2 != s1) { + log_dbg("Write error, expecting %zd, got %zd.", + s1, s2); + return; + } + + if (opt_fsync && fsync(fd) < 0) { + log_dbg("Write error, fsync."); + return; + } + + *bytes -= s2; + } +} + +static int copy_data(struct reenc_ctx *rc) +{ + size_t block_size = opt_bsize * 1024 * 1024; + int fd_old = -1, fd_new = -1; + int r = -EINVAL; + void *buf = NULL; + uint64_t bytes = 0; + + log_dbg("Data copy preparation."); + + fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0)); + if (fd_old == -1) { + log_err(_("Cannot open temporary LUKS device.")); + goto out; + } + + fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0)); + if (fd_new == -1) { + log_err(_("Cannot open temporary LUKS device.")); + goto out; + } + + if (ioctl(fd_old, BLKGETSIZE64, &rc->device_size_org_real) < 0) { + log_err(_("Cannot get device size.")); + goto out; + } + + if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size_new_real) < 0) { + log_err(_("Cannot get device size.")); + goto out; + } + + if (opt_device_size) + rc->device_size = opt_device_size; + else if (rc->reencrypt_mode == DECRYPT) + rc->device_size = rc->device_size_org_real; + else + rc->device_size = rc->device_size_new_real; + + if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) { + log_err(_("Allocation of aligned memory failed.")); + r = -ENOMEM; + goto out; + } + + set_int_handler(0); + + if (rc->reencrypt_direction == FORWARD) + r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes); + else + r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes); + + /* Zero (wipe) rest of now plain-only device when decrypting. + * (To not leave any sign of encryption here.) */ + if (!r && rc->reencrypt_mode == DECRYPT && + rc->device_size_new_real > rc->device_size_org_real) { + bytes = rc->device_size_new_real - rc->device_size_org_real; + zero_rest_of_device(fd_new, block_size, buf, &bytes, rc->device_size_org_real); + } + + set_int_block(1); + + if (r < 0 && r != -EAGAIN) + log_err(_("IO error during reencryption.")); + + (void)write_log(rc); +out: + if (fd_old != -1) + close(fd_old); + if (fd_new != -1) + close(fd_new); + free(buf); + return r; +} + +static int initialize_uuid(struct reenc_ctx *rc) +{ + struct crypt_device *cd = NULL; + int r; + uuid_t device_uuid; + + log_dbg("Initialising UUID."); + + if (opt_new) { + rc->device_uuid = strdup(NO_UUID); + rc->type = luksType(opt_type); + return 0; + } + + if (opt_decrypt && opt_uuid) { + r = uuid_parse(opt_uuid, device_uuid); + if (!r) + rc->device_uuid = strdup(opt_uuid); + else + log_err(_("Provided UUID is invalid.")); + + return r; + } + + /* Try to load LUKS from device */ + if ((r = crypt_init(&cd, hdr_device(rc)))) + return r; + crypt_set_log_callback(cd, _quiet_log, NULL); + r = crypt_load(cd, CRYPT_LUKS, NULL); + if (!r) + rc->device_uuid = strdup(crypt_get_uuid(cd)); + else + /* Reencryption already in progress - magic header? */ + r = device_check(rc, hdr_device(rc), CHECK_UNUSABLE); + + if (!r) + rc->type = isLUKS2(crypt_get_type(cd)) ? CRYPT_LUKS2 : CRYPT_LUKS1; + + crypt_free(cd); + return r; +} + +static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd, + const char *msg, int slot_to_check, int check, int verify) +{ + crypt_keyslot_info ki; + char *password; + int r = -EINVAL, retry_count; + size_t passwordLen; + + /* mode ENCRYPT call this without header */ + if (cd && slot_to_check != CRYPT_ANY_SLOT) { + ki = crypt_keyslot_status(cd, slot_to_check); + if (ki < CRYPT_SLOT_ACTIVE) + return -ENOENT; + } else + ki = CRYPT_SLOT_ACTIVE; + + retry_count = opt_tries ?: 1; + while (retry_count--) { + r = tools_get_key(msg, &password, &passwordLen, 0, 0, + NULL /*opt_key_file*/, 0, verify, 0 /*pwquality*/, cd); + if (r < 0) + return r; + if (quit) { + crypt_safe_free(password); + password = NULL; + passwordLen = 0; + return -EAGAIN; + } + + if (check) + r = crypt_activate_by_passphrase(cd, NULL, slot_to_check, + password, passwordLen, CRYPT_ACTIVATE_ALLOW_UNBOUND_KEY); + else + r = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check; + + if (r < 0) { + crypt_safe_free(password); + password = NULL; + passwordLen = 0; + } + if (r < 0 && r != -EPERM) + return r; + + if (r >= 0) { + tools_keyslot_msg(r, UNLOCKED); + rc->p[r].password = password; + rc->p[r].passwordLen = passwordLen; + if (ki != CRYPT_SLOT_UNBOUND) + rc->keyslot = r; + break; + } + tools_passphrase_msg(r); + } + + password = NULL; + passwordLen = 0; + + return r; +} + +static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check) +{ + char *password; + int r; + size_t passwordLen; + + r = tools_get_key(NULL, &password, &passwordLen, opt_keyfile_offset, + opt_keyfile_size, opt_key_file, 0, 0, 0, cd); + if (r < 0) + return r; + + /* mode ENCRYPT call this without header */ + if (cd) { + r = crypt_activate_by_passphrase(cd, NULL, slot_check, password, + passwordLen, 0); + + /* + * Allow keyslot only if it is last slot or if user explicitly + * specify which slot to use (IOW others will be disabled). + */ + if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT && + crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) { + log_err(_("Key file can be used only with --key-slot or with " + "exactly one key slot active.")); + r = -EINVAL; + } + } else { + r = slot_check == CRYPT_ANY_SLOT ? 0 : slot_check; + } + + if (r < 0) { + crypt_safe_free(password); + tools_passphrase_msg(r); + } else { + rc->keyslot = r; + rc->p[r].password = password; + rc->p[r].passwordLen = passwordLen; + } + + password = NULL; + passwordLen = 0; + + return r; +} + +static int initialize_passphrase(struct reenc_ctx *rc, const char *device) +{ + struct crypt_device *cd = NULL; + char msg[256]; + int i, r; + + log_dbg("Passphrases initialization."); + + if (rc->reencrypt_mode == ENCRYPT && !rc->in_progress) { + if (opt_key_file) + r = init_keyfile(rc, NULL, opt_key_slot); + else + r = init_passphrase1(rc, NULL, _("Enter new passphrase: "), opt_key_slot, 0, 1); + return r > 0 ? 0 : r; + } + + if ((r = crypt_init_data_device(&cd, device, rc->device)) || + (r = crypt_load(cd, CRYPT_LUKS, NULL))) { + crypt_free(cd); + return r; + } + + if (opt_key_slot != CRYPT_ANY_SLOT) + snprintf(msg, sizeof(msg), + _("Enter passphrase for key slot %d: "), opt_key_slot); + else + snprintf(msg, sizeof(msg), _("Enter any existing passphrase: ")); + + if (opt_key_file) { + r = init_keyfile(rc, cd, opt_key_slot); + } else if (rc->in_progress || + opt_key_slot != CRYPT_ANY_SLOT || + rc->reencrypt_mode == DECRYPT) { + r = init_passphrase1(rc, cd, msg, opt_key_slot, 1, 0); + } else for (i = 0; i < crypt_keyslot_max(crypt_get_type(cd)); i++) { + snprintf(msg, sizeof(msg), _("Enter passphrase for key slot %d: "), i); + r = init_passphrase1(rc, cd, msg, i, 1, 0); + if (r == -ENOENT) { + r = 0; + continue; + } + if (r < 0) + break; + } + + crypt_free(cd); + return r > 0 ? 0 : r; +} + +static int initialize_context(struct reenc_ctx *rc, const char *device) +{ + log_dbg("Initialising reencryption context."); + + rc->log_fd = -1; + + /* FIXME: replace MAX_KEYSLOT with crypt_keyslot_max(CRYPT_LUKS2) */ + if (crypt_keyslot_max(CRYPT_LUKS2) > MAX_SLOT) { + log_dbg("Internal error"); + return -EINVAL; + } + + if (!(rc->device = strndup(device, PATH_MAX))) + return -ENOMEM; + + if (opt_header_device && !(rc->device_header = strndup(opt_header_device, PATH_MAX))) + return -ENOMEM; + + if (device_check(rc, rc->device, CHECK_OPEN) < 0) + return -EINVAL; + + if (initialize_uuid(rc)) { + log_err(_("Device %s is not a valid LUKS device."), device); + return -EINVAL; + } + + if (opt_key_slot != CRYPT_ANY_SLOT && + opt_key_slot >= crypt_keyslot_max(rc->type)) { + log_err(_("Key slot is invalid.")); + return -EINVAL; + } + + /* Prepare device names */ + if (snprintf(rc->log_file, PATH_MAX, + "LUKS-%s.log", rc->device_uuid) < 0) + return -ENOMEM; + if (snprintf(rc->header_file_org, PATH_MAX, + "LUKS-%s.org", rc->device_uuid) < 0) + return -ENOMEM; + if (snprintf(rc->header_file_new, PATH_MAX, + "LUKS-%s.new", rc->device_uuid) < 0) + return -ENOMEM; + if (snprintf(rc->header_file_tmp, PATH_MAX, + "LUKS-%s.tmp", rc->device_uuid) < 0) + return -ENOMEM; + + /* Paths to encrypted devices */ + if (snprintf(rc->crypt_path_org, PATH_MAX, + "%s/%s", crypt_get_dir(), rc->header_file_org) < 0) + return -ENOMEM; + if (snprintf(rc->crypt_path_new, PATH_MAX, + "%s/%s", crypt_get_dir(), rc->header_file_new) < 0) + return -ENOMEM; + + remove_headers(rc); + + if (open_log(rc) < 0) { + log_err(_("Cannot open reencryption log file.")); + return -EINVAL; + } + + if (!rc->in_progress) { + if (opt_uuid) { + log_err(_("No decryption in progress, provided UUID can " + "be used only to resume suspended decryption process.")); + return -EINVAL; + } + + if (!opt_reduce_size) + rc->reencrypt_direction = FORWARD; + else { + rc->reencrypt_direction = BACKWARD; + rc->device_offset = (uint64_t)~0; + } + + if (opt_new) + rc->reencrypt_mode = ENCRYPT; + else if (opt_decrypt) + rc->reencrypt_mode = DECRYPT; + else + rc->reencrypt_mode = REENCRYPT; + } + + return 0; +} + +static void destroy_context(struct reenc_ctx *rc) +{ + int i; + + log_dbg("Destroying reencryption context."); + + close_log(rc); + remove_headers(rc); + + if (!rc->stained) { + unlink(rc->log_file); + unlink(rc->header_file_org); + unlink(rc->header_file_new); + unlink(rc->header_file_tmp); + } + + for (i = 0; i < MAX_SLOT; i++) + crypt_safe_free(rc->p[i].password); + + free(rc->device); + free(rc->device_header); + free(rc->device_uuid); +} + +static int luks2_change_pbkdf_params(struct reenc_ctx *rc) +{ + int i, r; + struct crypt_device *cd = NULL; + + if ((r = initialize_passphrase(rc, hdr_device(rc)))) + return r; + + if (crypt_init(&cd, hdr_device(rc)) || + crypt_load(cd, CRYPT_LUKS2, NULL)) { + r = -EINVAL; + goto out; + } + + if ((r = set_pbkdf_params(cd, CRYPT_LUKS2))) + goto out; + + log_dbg("LUKS2 keyslot pbkdf params change."); + + r = -EINVAL; + + for (i = 0; i < crypt_keyslot_max(CRYPT_LUKS2); i++) { + if (!rc->p[i].password) + continue; + if ((r = crypt_keyslot_change_by_passphrase(cd, i, i, + rc->p[i].password, rc->p[i].passwordLen, + rc->p[i].password, rc->p[i].passwordLen)) < 0) + goto out; + log_verbose(_("Changed pbkdf parameters in keyslot %i."), r); + r = 0; + } + + if (r) + goto out; + + /* see create_new_header */ + for (i = 0; i < crypt_keyslot_max(CRYPT_LUKS2); i++) + if (!rc->p[i].password) + (void)crypt_keyslot_destroy(cd, i); +out: + crypt_free(cd); + return r; +} + +static int run_reencrypt(const char *device) +{ + int r = -EINVAL; + static struct reenc_ctx rc = { + .stained = 1 + }; + + set_int_handler(0); + + if (initialize_context(&rc, device)) + goto out; + + /* short-circuit LUKS2 keyslot parameters change */ + if (opt_keep_key && isLUKS2(rc.type)) { + r = luks2_change_pbkdf_params(&rc); + goto out; + } + + log_dbg("Running reencryption."); + + if (!rc.in_progress) { + if ((r = initialize_passphrase(&rc, hdr_device(&rc)))) + goto out; + + log_dbg("Storing backup of LUKS headers."); + if (rc.reencrypt_mode == ENCRYPT) { + /* Create fake header for existing device */ + if ((r = backup_fake_header(&rc))) + goto out; + } else { + if ((r = backup_luks_headers(&rc))) + goto out; + /* Create fake header for decrypted device */ + if (rc.reencrypt_mode == DECRYPT && + (r = backup_fake_header(&rc))) + goto out; + if ((r = device_check(&rc, hdr_device(&rc), MAKE_UNUSABLE))) + goto out; + } + } else { + if ((r = initialize_passphrase(&rc, opt_decrypt ? rc.header_file_org : rc.header_file_new))) + goto out; + } + + if (!opt_keep_key) { + log_dbg("Running data area reencryption."); + if ((r = activate_luks_headers(&rc))) + goto out; + + if ((r = copy_data(&rc))) + goto out; + } else + log_dbg("Keeping existing key, skipping data area reencryption."); + + // FIXME: fix error path above to not skip this + if (rc.reencrypt_mode != DECRYPT) + r = restore_luks_header(&rc); + else + rc.stained = 0; +out: + destroy_context(&rc); + return r; +} + +static void help(poptContext popt_context, + enum poptCallbackReason reason __attribute__((unused)), + struct poptOption *key, + const char *arg __attribute__((unused)), + void *data __attribute__((unused))) +{ + if (key->shortName == '?') { + log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION); + poptPrintHelp(popt_context, stdout, 0); + tools_cleanup(); + poptFreeContext(popt_context); + exit(EXIT_SUCCESS); + } else if (key->shortName == 'V') { + log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION); + tools_cleanup(); + poptFreeContext(popt_context); + exit(EXIT_SUCCESS); + } else + usage(popt_context, EXIT_SUCCESS, NULL, NULL); +} + +int main(int argc, const char **argv) +{ + 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 }, + { "version",'V', POPT_ARG_NONE, NULL, 0, N_("Print package version"), NULL }, + POPT_TABLEEND + }; + static struct poptOption popt_options[] = { + { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), 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 }, + { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") }, + { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL }, + { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") }, + { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL }, + { "keep-key", '\0', POPT_ARG_NONE, &opt_keep_key, 0, N_("Do not change key, no data area reencryption"), NULL }, + { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file"), NULL }, + { "master-key-file", '\0', POPT_ARG_STRING, &opt_master_key_file, 0, N_("Read new volume (master) key from file"), NULL }, + { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") }, + { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL }, + { "progress-frequency",'\0', POPT_ARG_INT, &opt_progress_frequency, 0, N_("Progress line update (in seconds)"), N_("secs") }, + { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL }, + { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key"), NULL }, + { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key"), NULL }, + { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accessing devices"), NULL }, + { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block"), NULL }, + { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block"), NULL }, + { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)"), NULL }, + { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") }, + { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") }, + { "reduce-device-size",'\0', POPT_ARG_STRING, &opt_reduce_size_str, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("bytes") }, + { "device-size", '\0', POPT_ARG_STRING, &opt_device_size_str, 0, N_("Use only specified device size (ignore rest of device). DANGEROUS!"), N_("bytes") }, + { "new", 'N', POPT_ARG_NONE, &opt_new, 0, N_("Create new header on not encrypted device"), NULL }, + { "decrypt", '\0', POPT_ARG_NONE, &opt_decrypt, 0, N_("Permanently decrypt device (remove encryption)"), NULL }, + { "uuid", '\0', POPT_ARG_STRING, &opt_uuid, 0, N_("The UUID used to resume decryption"), NULL }, + { "type", '\0', POPT_ARG_STRING, &opt_type, 0, N_("Type of LUKS metadata: luks1, luks2"), NULL }, + { "pbkdf", '\0', POPT_ARG_STRING, &opt_pbkdf, 0, N_("PBKDF algorithm (for LUKS2): argon2i, argon2id, pbkdf2"), NULL }, + { "pbkdf-memory", '\0', POPT_ARG_LONG, &opt_pbkdf_memory, 0, N_("PBKDF memory cost limit"), N_("kilobytes") }, + { "pbkdf-parallel", '\0', POPT_ARG_LONG, &opt_pbkdf_parallel, 0, N_("PBKDF parallel cost"), N_("threads") }, + { "pbkdf-force-iterations",'\0',POPT_ARG_LONG, &opt_pbkdf_iterations, 0, N_("PBKDF iterations cost (forced, disables benchmark)"), NULL }, + { "header", '\0', POPT_ARG_STRING, &opt_header_device, 0, N_("Device or file with separated LUKS header"), NULL }, + POPT_TABLEEND + }; + poptContext popt_context; + int r; + + crypt_set_log_callback(NULL, tool_log, NULL); + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + + popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0); + poptSetOtherOptionHelp(popt_context, + _("[OPTION...] <device>")); + + while((r = poptGetNextOpt(popt_context)) > 0) ; + if (r < -1) + usage(popt_context, EXIT_FAILURE, poptStrerror(r), + poptBadOption(popt_context, POPT_BADOPTION_NOALIAS)); + + if (!opt_batch_mode) + log_verbose(_("Reencryption will change: %s%s%s%s%s%s."), + opt_keep_key ? "" : _("volume key"), + (!opt_keep_key && opt_hash) ? ", " : "", + opt_hash ? _("set hash to ") : "", opt_hash ?: "", + opt_cipher ? _(", set cipher to "): "", opt_cipher ?: ""); + + action_argv = poptGetArgs(popt_context); + if(!action_argv) + usage(popt_context, EXIT_FAILURE, _("Argument required."), + poptGetInvocationName(popt_context)); + + if (opt_random && opt_urandom) + usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."), + poptGetInvocationName(popt_context)); + + if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 || + opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0 || + opt_pbkdf_iterations < 0 || opt_pbkdf_memory < 0 || + opt_pbkdf_parallel < 0) { + usage(popt_context, EXIT_FAILURE, + _("Negative number for option not permitted."), + poptGetInvocationName(popt_context)); + } + + if (opt_pbkdf && crypt_parse_pbkdf(opt_pbkdf, &set_pbkdf)) + usage(popt_context, EXIT_FAILURE, + _("Password-based key derivation function (PBKDF) can be only pbkdf2 or argon2i/argon2id."), + poptGetInvocationName(popt_context)); + + if (opt_pbkdf_iterations && opt_iteration_time) + usage(popt_context, EXIT_FAILURE, + _("PBKDF forced iterations cannot be combined with iteration time option."), + poptGetInvocationName(popt_context)); + + if (opt_bsize < 1 || opt_bsize > 64) + usage(popt_context, EXIT_FAILURE, + _("Only values between 1 MiB and 64 MiB allowed for reencryption block size."), + poptGetInvocationName(popt_context)); + + if (opt_key_size % 8) + usage(popt_context, EXIT_FAILURE, + _("Key size must be a multiple of 8 bits"), + poptGetInvocationName(popt_context)); + + if (opt_key_slot != CRYPT_ANY_SLOT && + (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS2))) + usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."), + poptGetInvocationName(popt_context)); + + if (opt_random && opt_urandom) + usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."), + poptGetInvocationName(popt_context)); + + if (opt_device_size_str && + tools_string_to_size(NULL, opt_device_size_str, &opt_device_size)) + usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."), + poptGetInvocationName(popt_context)); + + if (opt_reduce_size_str && + tools_string_to_size(NULL, opt_reduce_size_str, &opt_reduce_size)) + usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."), + poptGetInvocationName(popt_context)); + if (opt_reduce_size > 64 * 1024 * 1024) + usage(popt_context, EXIT_FAILURE, _("Maximum device reduce size is 64 MiB."), + poptGetInvocationName(popt_context)); + if (opt_reduce_size % SECTOR_SIZE) + usage(popt_context, EXIT_FAILURE, _("Reduce size must be multiple of 512 bytes sector."), + poptGetInvocationName(popt_context)); + + if (opt_new && (!opt_reduce_size && !opt_header_device)) + usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce-device-size or --header."), + poptGetInvocationName(popt_context)); + + if (opt_keep_key && (opt_cipher || opt_new || opt_master_key_file)) + usage(popt_context, EXIT_FAILURE, _("Option --keep-key can be used only with --hash, --iter-time or --pbkdf-force-iterations."), + poptGetInvocationName(popt_context)); + + if (opt_new && opt_decrypt) + usage(popt_context, EXIT_FAILURE, _("Option --new cannot be used together with --decrypt."), + poptGetInvocationName(popt_context)); + + if (opt_decrypt && (opt_cipher || opt_hash || opt_reduce_size || opt_keep_key || opt_device_size)) + usage(popt_context, EXIT_FAILURE, _("Option --decrypt is incompatible with specified parameters."), + poptGetInvocationName(popt_context)); + + if (opt_uuid && !opt_decrypt) + usage(popt_context, EXIT_FAILURE, _("Option --uuid is allowed only together with --decrypt."), + poptGetInvocationName(popt_context)); + + if (!luksType(opt_type)) + usage(popt_context, EXIT_FAILURE, _("Invalid luks type. Use one of these: 'luks', 'luks1' or 'luks2'."), + poptGetInvocationName(popt_context)); + + if (opt_debug) { + opt_verbose = 1; + crypt_set_debug_level(-1); + dbg_version_and_cmd(argc, argv); + } + + r = run_reencrypt(action_argv[0]); + tools_cleanup(); + poptFreeContext(popt_context); + return translate_errno(r); +} |