diff options
Diffstat (limited to 'util-linux/volume_id/luks.c')
| -rw-r--r-- | util-linux/volume_id/luks.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/util-linux/volume_id/luks.c b/util-linux/volume_id/luks.c new file mode 100644 index 0000000..b0f0f5b --- /dev/null +++ b/util-linux/volume_id/luks.c @@ -0,0 +1,99 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "volume_id_internal.h" + +#define LUKS_MAGIC_L 6 +#define UUID_STRING_L 40 +#define LUKS_CIPHERNAME_L 32 +#define LUKS_CIPHERMODE_L 32 +#define LUKS_HASHSPEC_L 32 +#define LUKS_DIGESTSIZE 20 +#define LUKS_SALTSIZE 32 +#define LUKS_NUMKEYS 8 + +static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe }; + +struct luks_phdr { + uint8_t magic[LUKS_MAGIC_L]; + uint16_t version; + uint8_t cipherName[LUKS_CIPHERNAME_L]; + uint8_t cipherMode[LUKS_CIPHERMODE_L]; + uint8_t hashSpec[LUKS_HASHSPEC_L]; + uint32_t payloadOffset; + uint32_t keyBytes; + uint8_t mkDigest[LUKS_DIGESTSIZE]; + uint8_t mkDigestSalt[LUKS_SALTSIZE]; + uint32_t mkDigestIterations; + uint8_t uuid[UUID_STRING_L]; + struct { + uint32_t active; + uint32_t passwordIterations; + uint8_t passwordSalt[LUKS_SALTSIZE]; + uint32_t keyMaterialOffset; + uint32_t stripes; + } keyblock[LUKS_NUMKEYS]; +}; + +enum { + EXPECTED_SIZE_luks_phdr = 0 + + 1 * LUKS_MAGIC_L + + 2 + + 1 * LUKS_CIPHERNAME_L + + 1 * LUKS_CIPHERMODE_L + + 1 * LUKS_HASHSPEC_L + + 4 + + 4 + + 1 * LUKS_DIGESTSIZE + + 1 * LUKS_SALTSIZE + + 4 + + 1 * UUID_STRING_L + + LUKS_NUMKEYS * (0 + + 4 + + 4 + + 1 * LUKS_SALTSIZE + + 4 + + 4 + ) +}; + +struct BUG_bad_size_luks_phdr { + char BUG_bad_size_luks_phdr[ + sizeof(struct luks_phdr) == EXPECTED_SIZE_luks_phdr ? + 1 : -1]; +}; + +int volume_id_probe_luks(struct volume_id *id, uint64_t off) +{ + struct luks_phdr *header; + + header = volume_id_get_buffer(id, off, sizeof(*header)); + if (header == NULL) + return -1; + + if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L)) + return -1; + +// volume_id_set_usage(id, VOLUME_ID_CRYPTO); + volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING); +// id->type = "crypto_LUKS"; + + return 0; +} |