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-rw-r--r--src/cryptsetup_reencrypt.c1790
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*)&params2 : (void*)&params);
+
+ 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, &params);
+ 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*)&params2 : (void*)&params);
+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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 02:09:47 +0000