static int test_write_lseek_blockwise(void)
{
void *buffer = NULL;
int fd = -1;
ssize_t ret = -EINVAL;
//printf("Entering test_write_lseek_blockwise\n");
if (posix_memalign(&buffer, test_mem_alignment, test_length)) {
fprintf(stderr, "Failed to allocate aligned buffer.\n");
goto out;
}
fd = open(test_file, O_RDWR | O_DIRECT);
if (fd < 0) {
fprintf(stderr, "Failed to open %s.\n", test_file);
goto out;
}
ret = write_lseek_blockwise(fd, test_bsize, test_mem_alignment, buffer, test_length, test_offset);
if (ret < 0)
goto out;
ret = (size_t) ret == test_length ? 0 : -EIO;
out:
if (fd >= 0)
close(fd);
free(buffer);
return ret;
}
int LUKS_write_phdr(struct luks_phdr *hdr,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
ssize_t hdr_size = sizeof(struct luks_phdr);
int devfd = 0;
unsigned int i;
struct luks_phdr convHdr;
int r;
log_dbg(ctx, "Updating LUKS header of size %zu on device %s",
sizeof(struct luks_phdr), device_path(device));
r = LUKS_check_device_size(ctx, hdr, 1);
if (r)
return r;
devfd = device_open(ctx, device, O_RDWR);
if (devfd < 0) {
if (errno == EACCES)
log_err(ctx, _("Cannot write to device %s, permission denied."),
device_path(device));
else
log_err(ctx, _("Cannot open device %s."), device_path(device));
return -EINVAL;
}
memcpy(&convHdr, hdr, hdr_size);
memset(&convHdr._padding, 0, sizeof(convHdr._padding));
/* Convert every uint16/32_t item to network byte order */
convHdr.version = htons(hdr->version);
convHdr.payloadOffset = htonl(hdr->payloadOffset);
convHdr.keyBytes = htonl(hdr->keyBytes);
convHdr.mkDigestIterations = htonl(hdr->mkDigestIterations);
for(i = 0; i < LUKS_NUMKEYS; ++i) {
convHdr.keyblock[i].active = htonl(hdr->keyblock[i].active);
convHdr.keyblock[i].passwordIterations = htonl(hdr->keyblock[i].passwordIterations);
convHdr.keyblock[i].keyMaterialOffset = htonl(hdr->keyblock[i].keyMaterialOffset);
convHdr.keyblock[i].stripes = htonl(hdr->keyblock[i].stripes);
}
r = write_lseek_blockwise(devfd, device_block_size(ctx, device), device_alignment(device),
&convHdr, hdr_size, 0) < hdr_size ? -EIO : 0;
if (r)
log_err(ctx, _("Error during update of LUKS header on device %s."), device_path(device));
device_sync(ctx, device);
/* Re-read header from disk to be sure that in-memory and on-disk data are the same. */
if (!r) {
r = LUKS_read_phdr(hdr, 1, 0, ctx);
if (r)
log_err(ctx, _("Error re-reading LUKS header after update on device %s."),
device_path(device));
}
return r;
}
/* Write verity superblock to disk */
int VERITY_write_sb(struct crypt_device *cd,
uint64_t sb_offset,
const char *uuid_string,
struct crypt_params_verity *params)
{
struct device *device = crypt_metadata_device(cd);
int bsize = device_block_size(device);
struct verity_sb sb = {};
ssize_t hdr_size = sizeof(struct verity_sb);
uuid_t uuid;
int r, devfd = 0;
log_dbg("Updating VERITY header of size %zu on device %s, offset %" PRIu64 ".",
sizeof(struct verity_sb), device_path(device), sb_offset);
if (!uuid_string || uuid_parse(uuid_string, uuid) == -1) {
log_err(cd, _("Wrong VERITY UUID format provided on device %s. \n"),
device_path(device));
return -EINVAL;
}
if (params->flags & CRYPT_VERITY_NO_HEADER) {
log_err(cd, _("Verity device %s doesn't use on-disk header.\n"),
device_path(device));
return -EINVAL;
}
devfd = device_open(device, O_RDWR);
if(devfd == -1) {
log_err(cd, _("Cannot open device %s.\n"), device_path(device));
return -EINVAL;
}
memcpy(&sb.signature, VERITY_SIGNATURE, sizeof(sb.signature));
sb.version = cpu_to_le32(1);
sb.hash_type = cpu_to_le32(params->hash_type);
sb.data_block_size = cpu_to_le32(params->data_block_size);
sb.hash_block_size = cpu_to_le32(params->hash_block_size);
sb.salt_size = cpu_to_le16(params->salt_size);
sb.data_blocks = cpu_to_le64(params->data_size);
strncpy((char *)sb.algorithm, params->hash_name, sizeof(sb.algorithm));
memcpy(sb.salt, params->salt, params->salt_size);
memcpy(sb.uuid, uuid, sizeof(sb.uuid));
r = write_lseek_blockwise(devfd, bsize, (char*)&sb, hdr_size, sb_offset) < hdr_size ? -EIO : 0;
if (r)
log_err(cd, _("Error during update of verity header on device %s.\n"),
device_path(device));
close(devfd);
return r;
}
int LUKS_hdr_restore(
const char *backup_file,
struct luks_phdr *hdr,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
int fd, r = 0, devfd = -1, diff_uuid = 0;
ssize_t ret, buffer_size = 0;
char *buffer = NULL, msg[200];
struct luks_phdr hdr_file;
r = LUKS_read_phdr_backup(backup_file, &hdr_file, 0, ctx);
if (r == -ENOENT)
return r;
if (!r)
buffer_size = LUKS_device_sectors(&hdr_file) << SECTOR_SHIFT;
if (r || buffer_size < LUKS_ALIGN_KEYSLOTS) {
log_err(ctx, _("Backup file doesn't contain valid LUKS header."));
r = -EINVAL;
goto out;
}
buffer = crypt_safe_alloc(buffer_size);
if (!buffer) {
r = -ENOMEM;
goto out;
}
fd = open(backup_file, O_RDONLY);
if (fd == -1) {
log_err(ctx, _("Cannot open header backup file %s."), backup_file);
r = -EINVAL;
goto out;
}
ret = read_buffer(fd, buffer, buffer_size);
close(fd);
if (ret < buffer_size) {
log_err(ctx, _("Cannot read header backup file %s."), backup_file);
r = -EIO;
goto out;
}
r = LUKS_read_phdr(hdr, 0, 0, ctx);
if (r == 0) {
log_dbg(ctx, "Device %s already contains LUKS header, checking UUID and offset.", device_path(device));
if(hdr->payloadOffset != hdr_file.payloadOffset ||
hdr->keyBytes != hdr_file.keyBytes) {
log_err(ctx, _("Data offset or key size differs on device and backup, restore failed."));
r = -EINVAL;
goto out;
}
if (memcmp(hdr->uuid, hdr_file.uuid, UUID_STRING_L))
diff_uuid = 1;
}
if (snprintf(msg, sizeof(msg), _("Device %s %s%s"), device_path(device),
r ? _("does not contain LUKS header. Replacing header can destroy data on that device.") :
_("already contains LUKS header. Replacing header will destroy existing keyslots."),
diff_uuid ? _("\nWARNING: real device header has different UUID than backup!") : "") < 0) {
r = -ENOMEM;
goto out;
}
if (!crypt_confirm(ctx, msg)) {
r = -EINVAL;
goto out;
}
log_dbg(ctx, "Storing backup of header (%zu bytes) and keyslot area (%zu bytes) to device %s.",
sizeof(*hdr), buffer_size - LUKS_ALIGN_KEYSLOTS, device_path(device));
devfd = device_open(ctx, device, O_RDWR);
if (devfd < 0) {
if (errno == EACCES)
log_err(ctx, _("Cannot write to device %s, permission denied."),
device_path(device));
else
log_err(ctx, _("Cannot open device %s."), device_path(device));
r = -EINVAL;
goto out;
}
if (write_lseek_blockwise(devfd, device_block_size(ctx, device), device_alignment(device),
buffer, buffer_size, 0) < buffer_size) {
r = -EIO;
goto out;
}
/* Be sure to reload new data */
r = LUKS_read_phdr(hdr, 1, 0, ctx);
out:
device_sync(ctx, device);
crypt_safe_free(buffer);
return r;
}
/*
* Write LUKS2 header to disk at specific offset.
*/
static int hdr_write_disk(struct device *device, struct luks2_hdr *hdr,
const char *json_area, int secondary)
{
struct luks2_hdr_disk hdr_disk;
uint64_t offset = secondary ? hdr->hdr_size : 0;
size_t hdr_json_len;
int devfd = -1, r;
log_dbg("Trying to write LUKS2 header (%zu bytes) at offset %" PRIu64 ".",
hdr->hdr_size, offset);
/* FIXME: read-only device silent fail? */
devfd = device_open_locked(device, O_RDWR);
if (devfd < 0)
return devfd == -1 ? -EINVAL : devfd;
hdr_json_len = hdr->hdr_size - LUKS2_HDR_BIN_LEN;
hdr_to_disk(hdr, &hdr_disk, secondary, offset);
/*
* Write header without checksum but with proper seqid.
*/
if (write_lseek_blockwise(devfd, device_block_size(device),
device_alignment(device), (char *)&hdr_disk,
LUKS2_HDR_BIN_LEN, offset) < (ssize_t)LUKS2_HDR_BIN_LEN) {
close(devfd);
return -EIO;
}
/*
* Write json area.
*/
if (write_lseek_blockwise(devfd, device_block_size(device),
device_alignment(device),
CONST_CAST(char*)json_area, hdr_json_len,
LUKS2_HDR_BIN_LEN + offset) < (ssize_t)hdr_json_len) {
close(devfd);
return -EIO;
}
/*
* Calculate checksum and write header with checksum.
*/
r = hdr_checksum_calculate(hdr_disk.checksum_alg, &hdr_disk,
json_area, hdr_json_len);
if (r < 0) {
close(devfd);
return r;
}
log_dbg_checksum(hdr_disk.csum, hdr_disk.checksum_alg, "in-memory");
if (write_lseek_blockwise(devfd, device_block_size(device),
device_alignment(device), (char *)&hdr_disk,
LUKS2_HDR_BIN_LEN, offset) < (ssize_t)LUKS2_HDR_BIN_LEN)
r = -EIO;
close(devfd);
return r;
}
