diff options
Diffstat (limited to 'src/utils_reencrypt_luks1.c')
| -rw-r--r-- | src/utils_reencrypt_luks1.c | 1354 |
1 files changed, 1354 insertions, 0 deletions
diff --git a/src/utils_reencrypt_luks1.c b/src/utils_reencrypt_luks1.c new file mode 100644 index 0000000..ae849c0 --- /dev/null +++ b/src/utils_reencrypt_luks1.c @@ -0,0 +1,1354 @@ +/* + * cryptsetup - LUKS1 utility for offline re-encryption + * + * Copyright (C) 2012-2023 Red Hat, Inc. All rights reserved. + * Copyright (C) 2012-2023 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 <sys/ioctl.h> +#include <linux/fs.h> +#include <uuid/uuid.h> + +#include "cryptsetup.h" +#include "cryptsetup_args.h" +#include "utils_luks.h" + +#define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee" + +extern int64_t data_shift; + +#define MAX_SLOT 8 + +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; + + bool stained; + bool in_progress; + 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_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; + +static void _quiet_log(int level, const char *msg, void *usrptr) +{ + if (!ARG_SET(OPT_DEBUG_ID)) + 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 *hdr_device(const struct reenc_ctx *rc) +{ + return rc->device_header ?: rc->device; +} + +/* 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, bool exclusive) +{ + 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) && exclusive) ? O_EXCL : 0)); /* lgtm[cpp/toctou-race-condition] */ + 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 = be16_to_cpu(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 == CHECK_UNUSABLE && version == 1) { + r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0; + if (rc && !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 (rc && s > 0 && set_magic == MAKE_UNUSABLE) + rc->stained = true; + } + 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); + if (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) < 0) + return -EINVAL; + + 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 = ARG_SET(OPT_USE_FSYNC_ID) ? 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 = true; + } + + 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_LUKS1, NULL))) + goto out; + + log_verbose(_("Activating temporary device using old LUKS header.")); + if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org, + ARG_INT32(OPT_KEY_SLOT_ID), 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_LUKS1, NULL))) + goto out; + + log_verbose(_("Activating temporary device using new LUKS header.")); + if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new, + ARG_INT32(OPT_KEY_SLOT_ID), 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 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, + 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 (ARG_SET(OPT_USE_RANDOM_ID)) + crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM); + else if (ARG_SET(OPT_USE_URANDOM_ID)) + crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM); + + r = set_pbkdf_params(cd_new, CRYPT_LUKS1); + 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, CRYPT_LUKS1, 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(CRYPT_LUKS1); 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 backup_luks_headers(struct reenc_ctx *rc) +{ + struct crypt_device *cd = NULL; + struct crypt_params_luks1 params = {0}; + 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_LUKS1, NULL))) + goto out; + + if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org))) + goto out; + + log_verbose(_("%s header backup of device %s created."), "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(ARG_UINT64(OPT_REDUCE_DEVICE_SIZE_ID)); + + if ((r = create_empty_header(rc->header_file_new))) + goto out; + + params.hash = ARG_STR(OPT_HASH_ID) ?: DEFAULT_LUKS1_HASH; + params.data_device = rc->device; + + if (ARG_SET(OPT_CIPHER_ID)) { + r = crypt_parse_name_and_mode(ARG_STR(OPT_CIPHER_ID), cipher, NULL, cipher_mode); + if (r < 0) { + log_err(_("No known cipher specification pattern detected.")); + goto out; + } + } + + key_size = ARG_SET(OPT_KEY_SIZE_ID) ? ARG_UINT32(OPT_KEY_SIZE_ID) / 8 : (uint32_t)crypt_get_volume_key_size(cd); + + if (ARG_SET(OPT_KEEP_KEY_ID)) { + 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 (ARG_SET(OPT_VOLUME_KEY_FILE_ID)) { + log_dbg("Loading new key from file."); + r = tools_read_vk(ARG_STR(OPT_VOLUME_KEY_FILE_ID), &key, key_size); + } + + if (r < 0) + goto out; + + r = create_new_header(rc, cd, + ARG_SET(OPT_CIPHER_ID) ? cipher : crypt_get_cipher(cd), + ARG_SET(OPT_CIPHER_ID) ? cipher_mode : crypt_get_cipher_mode(cd), + crypt_get_uuid(cd), + key, + key_size, + mdata_size, + keyslots_size, + (void*)¶ms); + +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}; + 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 (!ARG_SET(OPT_KEY_SIZE_ID)) + ARG_SET_UINT32(OPT_KEY_SIZE_ID, DEFAULT_LUKS1_KEYBITS); + + if (ARG_SET(OPT_CIPHER_ID)) { + r = crypt_parse_name_and_mode(ARG_STR(OPT_CIPHER_ID), 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 = ARG_STR(OPT_HASH_ID) ?: DEFAULT_LUKS1_HASH; + params.data_alignment = 0; + params.data_device = rc->device; + + 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, ARG_UINT32(OPT_KEY_SIZE_ID) / 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; + + params.data_alignment = ROUND_SECTOR(ARG_UINT64(OPT_REDUCE_DEVICE_SIZE_ID)); + r = create_new_header(rc, NULL, + ARG_SET(OPT_CIPHER_ID) ? cipher : DEFAULT_LUKS1_CIPHER, + ARG_SET(OPT_CIPHER_ID) ? cipher_mode : DEFAULT_LUKS1_MODE, + NULL, NULL, + ARG_UINT32(OPT_KEY_SIZE_ID) / 8, + 0, + 0, + (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 (ARG_SET(OPT_ENCRYPT_ID) && 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, CRYPT_LUKS1, rc->header_file_new); + } + + crypt_free(cd); +out: + if (r) + log_err(_("Cannot restore %s header on device %s."), "LUKS1", hdr_device(rc)); + else { + log_verbose(_("%s header on device %s restored."), "LUKS1", hdr_device(rc)); + rc->stained = false; + } + 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; + int r = -EIO; + char *backing_file = NULL; + struct tools_progress_params prog_parms = { + .frequency = ARG_UINT32(OPT_PROGRESS_FREQUENCY_ID), + .batch_mode = ARG_SET(OPT_BATCH_MODE_ID), + .json_output = ARG_SET(OPT_PROGRESS_JSON_ID), + .interrupt_message = _("\nReencryption interrupted."), + .device = tools_get_device_name(rc->device, &backing_file) + }; + + log_dbg("Reencrypting in forward direction."); + + if (lseek(fd_old, rc->device_offset, SEEK_SET) < 0 || + lseek(fd_new, rc->device_offset, SEEK_SET) < 0) { + log_err(_("Cannot seek to device offset.")); + goto out; + } + + rc->resume_bytes = *bytes = rc->device_offset; + + tools_progress(rc->device_size, *bytes, &prog_parms); + + if (write_log(rc) < 0) + goto out; + + while (!quit && rc->device_offset < rc->device_size) { + if ((rc->device_size - rc->device_offset) < (uint64_t)block_size) + block_size = rc->device_size - rc->device_offset; + 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); + goto out; + } + + /* 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); + goto out; + } + + rc->device_offset += s1; + if (ARG_SET(OPT_WRITE_LOG_ID) && write_log(rc) < 0) + goto out; + + if (ARG_SET(OPT_USE_FSYNC_ID) && fsync(fd_new) < 0) { + log_dbg("Write error, fsync."); + goto out; + } + + *bytes += (uint64_t)s2; + + tools_progress(rc->device_size, *bytes, &prog_parms); + } + + r = 0; +out: + free(backing_file); + return quit ? -EAGAIN : r; +} + +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; + off_t working_offset; + int r = -EIO; + char *backing_file = NULL; + struct tools_progress_params prog_parms = { + .frequency = ARG_UINT32(OPT_PROGRESS_FREQUENCY_ID), + .batch_mode = ARG_SET(OPT_BATCH_MODE_ID), + .json_output = ARG_SET(OPT_PROGRESS_JSON_ID), + .interrupt_message = _("\nReencryption interrupted."), + .device = tools_get_device_name(rc->device, &backing_file) + }; + + 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_progress(rc->device_size, *bytes, &prog_parms); + + if (write_log(rc) < 0) + goto out; + + /* dirty the device during ENCRYPT mode */ + rc->stained = true; + + 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 (lseek(fd_old, working_offset, SEEK_SET) < 0 || + lseek(fd_new, working_offset, SEEK_SET) < 0) { + log_err(_("Cannot seek to device offset.")); + goto out; + } + + 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); + goto out; + } + + s2 = write(fd_new, buf, working_block); + if (s2 < 0) { + log_dbg("Write error, expecting %zu, got %zd.", + block_size, s2); + goto out; + } + + rc->device_offset -= s1; + if (ARG_SET(OPT_WRITE_LOG_ID) && write_log(rc) < 0) + goto out; + + if (ARG_SET(OPT_USE_FSYNC_ID) && fsync(fd_new) < 0) { + log_dbg("Write error, fsync."); + goto out; + } + + *bytes += (uint64_t)s2; + + tools_progress(rc->device_size, *bytes, &prog_parms); + } + + r = 0; +out: + free(backing_file); + return quit ? -EAGAIN : r; +} + +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 (lseek(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 (ARG_SET(OPT_USE_FSYNC_ID) && fsync(fd) < 0) { + log_dbg("Write error, fsync."); + return; + } + + *bytes -= s2; + } +} + +static int copy_data(struct reenc_ctx *rc) +{ + size_t block_size = ARG_UINT32(OPT_BLOCK_SIZE_ID) * 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 | (ARG_SET(OPT_USE_DIRECTIO_ID) ? 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 | (ARG_SET(OPT_USE_DIRECTIO_ID) ? 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 (ARG_SET(OPT_DEVICE_SIZE_ID)) + rc->device_size = ARG_UINT64(OPT_DEVICE_SIZE_ID); + 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 (ARG_SET(OPT_ENCRYPT_ID)) { + rc->device_uuid = strdup(NO_UUID); + return 0; + } + + if (ARG_SET(OPT_DECRYPT_ID) && ARG_SET(OPT_UUID_ID)) { + r = uuid_parse(ARG_STR(OPT_UUID_ID), device_uuid); + if (!r) + rc->device_uuid = strdup(ARG_STR(OPT_UUID_ID)); + 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_LUKS1, 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, true); + + 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 = ARG_UINT32(OPT_TRIES_ID) ?: 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, ARG_UINT64(OPT_KEYFILE_OFFSET_ID), + ARG_UINT32(OPT_KEYFILE_SIZE_ID), ARG_STR(OPT_KEY_FILE_ID), 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 && ARG_INT32(OPT_KEY_SLOT_ID) == 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 (ARG_SET(OPT_KEY_FILE_ID)) + r = init_keyfile(rc, NULL, ARG_INT32(OPT_KEY_SLOT_ID)); + else + r = init_passphrase1(rc, NULL, _("Enter new passphrase: "), ARG_INT32(OPT_KEY_SLOT_ID), 0, 1); + return r > 0 ? 0 : r; + } + + if ((r = crypt_init_data_device(&cd, device, rc->device)) || + (r = crypt_load(cd, CRYPT_LUKS1, NULL))) { + crypt_free(cd); + return r; + } + + if (ARG_INT32(OPT_KEY_SLOT_ID) != CRYPT_ANY_SLOT) + snprintf(msg, sizeof(msg), + _("Enter passphrase for key slot %d: "), ARG_INT32(OPT_KEY_SLOT_ID)); + else + snprintf(msg, sizeof(msg), _("Enter any existing passphrase: ")); + + if (ARG_SET(OPT_KEY_FILE_ID)) { + r = init_keyfile(rc, cd, ARG_INT32(OPT_KEY_SLOT_ID)); + } else if (rc->in_progress || + ARG_INT32(OPT_KEY_SLOT_ID) != CRYPT_ANY_SLOT || + rc->reencrypt_mode == DECRYPT) { + r = init_passphrase1(rc, cd, msg, ARG_INT32(OPT_KEY_SLOT_ID), 1, 0); + } else for (i = 0; i < crypt_keyslot_max(CRYPT_LUKS1); 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."); + + memset(rc, 0, sizeof(*rc)); + + rc->in_progress = false; + rc->stained = true; + rc->log_fd = -1; + + if (!(rc->device = strndup(device, PATH_MAX))) + return -ENOMEM; + + if (ARG_SET(OPT_HEADER_ID) && !(rc->device_header = strndup(ARG_STR(OPT_HEADER_ID), PATH_MAX))) + return -ENOMEM; + + if (device_check(rc, rc->device, CHECK_OPEN, true) < 0) + return -EINVAL; + + if (initialize_uuid(rc)) { + log_err(_("Device %s is not a valid LUKS device."), device); + return -EINVAL; + } + + if (ARG_INT32(OPT_KEY_SLOT_ID) != CRYPT_ANY_SLOT && + ARG_INT32(OPT_KEY_SLOT_ID) >= crypt_keyslot_max(CRYPT_LUKS1)) { + 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; + + /* 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 (ARG_SET(OPT_UUID_ID)) { + log_err(_("No decryption in progress, provided UUID can " + "be used only to resume suspended decryption process.")); + return -EINVAL; + } + + if (!ARG_SET(OPT_REDUCE_DEVICE_SIZE_ID)) + rc->reencrypt_direction = FORWARD; + else { + rc->reencrypt_direction = BACKWARD; + rc->device_offset = (uint64_t)~0; + } + + if (ARG_SET(OPT_ENCRYPT_ID)) + rc->reencrypt_mode = ENCRYPT; + else if (ARG_SET(OPT_DECRYPT_ID)) + 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); + } + + 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); +} + +int reencrypt_luks1(const char *device) +{ + int r = -EINVAL; + struct reenc_ctx *rc; + + rc = malloc(sizeof(*rc)); + if (!rc) + return -ENOMEM; + + if (!ARG_SET(OPT_BATCH_MODE_ID)) + log_verbose(_("Reencryption will change: %s%s%s%s%s%s."), + ARG_SET(OPT_KEEP_KEY_ID) ? "" : _("volume key"), + (!ARG_SET(OPT_KEEP_KEY_ID) && ARG_SET(OPT_HASH_ID)) ? ", " : "", + ARG_SET(OPT_HASH_ID) ? _("set hash to ") : "", ARG_STR(OPT_HASH_ID) ?: "", + ARG_SET(OPT_CIPHER_ID) ? _(", set cipher to "): "", ARG_STR(OPT_CIPHER_ID) ?: ""); + /* FIXME: block all non pbkdf2 pkdfs */ + + set_int_handler(0); + + if (initialize_context(rc, device)) + 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, true))) + goto out; + } + } else { + if ((r = initialize_passphrase(rc, ARG_SET(OPT_DECRYPT_ID) ? rc->header_file_org : rc->header_file_new))) + goto out; + } + + if (!ARG_SET(OPT_KEEP_KEY_ID)) { + 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 = false; +out: + destroy_context(rc); + free(rc); + + return r; +} + +int reencrypt_luks1_in_progress(const char *device) +{ + struct stat st; + + if (stat(device, &st) || (size_t)st.st_size < pagesize()) + return -EINVAL; + + return device_check(NULL, device, CHECK_UNUSABLE, false); +} |