Integrate geli into autoconfiguration system
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
d7bdab32b8
commit
20a409405b
13 changed files with 835 additions and 682 deletions
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@ -53,7 +53,7 @@
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#include <grub/err.h>
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#include <grub/disk.h>
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#include <grub/crypto.h>
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#include <grub/extcmd.h>
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#include <grub/partition.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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@ -105,17 +105,6 @@ const char *algorithms[] = {
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#define MAX_PASSPHRASE 256
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static const struct grub_arg_option options[] =
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{
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{"uuid", 'u', 0, N_("Mount by UUID."), 0, 0},
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{"all", 'a', 0, N_("Mount all."), 0, 0},
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{"boot", 'b', 0, N_("Mount all volumes marked as boot."), 0, 0},
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{0, 0, 0, 0, 0, 0}
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};
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static int check_uuid, check_boot, have_it;
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static char *search_uuid;
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static gcry_err_code_t
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geli_rekey (struct grub_cryptodisk *dev, grub_uint64_t zoneno)
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{
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@ -150,56 +139,21 @@ ascii2hex (char c)
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return 0;
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}
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static grub_cryptodisk_t
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configure_ciphers (const struct grub_geli_phdr *header)
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static inline gcry_err_code_t
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make_uuid (const struct grub_geli_phdr *header,
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char *uuid)
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{
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grub_cryptodisk_t newdev;
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grub_crypto_cipher_handle_t cipher = NULL, secondary_cipher = NULL;
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const struct gcry_cipher_spec *ciph;
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const char *ciphername = NULL;
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char uuid[GRUB_MD_SHA256->mdlen * 2 + 1];
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grub_uint8_t uuidbin[GRUB_MD_SHA256->mdlen];
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gcry_err_code_t err;
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grub_uint8_t *iptr;
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char *optr;
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gcry_err_code_t gcry_err;
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/* Look for GELI magic sequence. */
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if (grub_memcmp (header->magic, GELI_MAGIC, sizeof (GELI_MAGIC))
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|| grub_le_to_cpu32 (header->version) > 5
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|| grub_le_to_cpu32 (header->version) < 1)
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{
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grub_dprintf ("geli", "wrong magic %02x\n", header->magic[0]);
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return NULL;
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}
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if ((grub_le_to_cpu32 (header->sector_size)
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& (grub_le_to_cpu32 (header->sector_size) - 1))
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|| grub_le_to_cpu32 (header->sector_size) == 0)
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{
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grub_dprintf ("geli", "incorrect sector size %d\n",
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grub_le_to_cpu32 (header->sector_size));
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return NULL;
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}
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err = grub_crypto_hmac_buffer (GRUB_MD_SHA256,
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header->salt, sizeof (header->salt),
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"uuid", sizeof ("uuid") - 1, uuidbin);
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if (err)
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return err;
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if (grub_le_to_cpu32 (header->flags) & GRUB_GELI_FLAGS_ONETIME)
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{
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grub_dprintf ("geli", "skipping one-time volume\n");
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return NULL;
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}
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if (check_boot && !(grub_le_to_cpu32 (header->flags) & GRUB_GELI_FLAGS_BOOT))
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{
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grub_dprintf ("geli", "not a boot volume\n");
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return NULL;
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}
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gcry_err = grub_crypto_hmac_buffer (GRUB_MD_SHA256,
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header->salt, sizeof (header->salt),
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"uuid", sizeof ("uuid") - 1, uuidbin);
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if (gcry_err)
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{
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grub_crypto_gcry_error (gcry_err);
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return NULL;
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}
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optr = uuid;
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for (iptr = uuidbin; iptr < &uuidbin[ARRAY_SIZE (uuidbin)]; iptr++)
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{
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@ -207,22 +161,133 @@ configure_ciphers (const struct grub_geli_phdr *header)
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optr += 2;
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}
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*optr = 0;
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return GPG_ERR_NO_ERROR;
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}
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if (check_uuid && grub_strcasecmp (search_uuid, uuid) != 0)
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#ifdef GRUB_UTIL
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <grub/emu/hostdisk.h>
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#include <unistd.h>
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#include <string.h>
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#include <grub/emu/misc.h>
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char *
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grub_util_get_geli_uuid (const char *dev)
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{
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int fd = open (dev, O_RDONLY);
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grub_uint64_t s;
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unsigned log_secsize;
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grub_uint8_t hdr[512];
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struct grub_geli_phdr *header;
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char *uuid;
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gcry_err_code_t err;
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if (fd < 0)
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return NULL;
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s = grub_util_get_fd_sectors (fd, &log_secsize);
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grub_util_fd_seek (fd, dev, (s << log_secsize) - 512);
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uuid = xmalloc (GRUB_MD_SHA256->mdlen * 2 + 1);
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if (grub_util_fd_read (fd, (void *) &hdr, 512) < 0)
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grub_util_error ("couldn't read ELI metadata");
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COMPILE_TIME_ASSERT (sizeof (header) <= 512);
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header = (void *) &hdr;
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/* Look for GELI magic sequence. */
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if (grub_memcmp (header->magic, GELI_MAGIC, sizeof (GELI_MAGIC))
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|| grub_le_to_cpu32 (header->version) > 5
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|| grub_le_to_cpu32 (header->version) < 1)
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grub_util_error ("wrong ELI magic or version");
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err = make_uuid ((void *) &hdr, uuid);
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if (err)
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return NULL;
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return uuid;
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}
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#endif
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static grub_cryptodisk_t
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configure_ciphers (grub_disk_t disk, const char *check_uuid,
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int boot_only)
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{
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grub_cryptodisk_t newdev;
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struct grub_geli_phdr header;
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grub_crypto_cipher_handle_t cipher = NULL, secondary_cipher = NULL;
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const struct gcry_cipher_spec *ciph;
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const char *ciphername = NULL;
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gcry_err_code_t gcry_err;
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char uuid[GRUB_MD_SHA256->mdlen * 2 + 1];
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grub_disk_addr_t sector;
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grub_err_t err;
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sector = grub_disk_get_size (disk);
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if (sector == GRUB_DISK_SIZE_UNKNOWN || sector == 0)
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return NULL;
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/* Read the GELI header. */
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err = grub_disk_read (disk, sector - 1, 0, sizeof (header), &header);
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if (err)
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return NULL;
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/* Look for GELI magic sequence. */
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if (grub_memcmp (header.magic, GELI_MAGIC, sizeof (GELI_MAGIC))
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|| grub_le_to_cpu32 (header.version) > 5
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|| grub_le_to_cpu32 (header.version) < 1)
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{
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grub_dprintf ("geli", "%s != %s\n", uuid, search_uuid);
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grub_dprintf ("geli", "wrong magic %02x\n", header.magic[0]);
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return NULL;
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}
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if (grub_le_to_cpu16 (header->alg) >= ARRAY_SIZE (algorithms)
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|| algorithms[grub_le_to_cpu16 (header->alg)] == NULL)
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if ((grub_le_to_cpu32 (header.sector_size)
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& (grub_le_to_cpu32 (header.sector_size) - 1))
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|| grub_le_to_cpu32 (header.sector_size) == 0)
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{
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grub_dprintf ("geli", "incorrect sector size %d\n",
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grub_le_to_cpu32 (header.sector_size));
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return NULL;
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}
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if (grub_le_to_cpu32 (header.flags) & GRUB_GELI_FLAGS_ONETIME)
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{
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grub_dprintf ("geli", "skipping one-time volume\n");
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return NULL;
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}
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if (boot_only && !(grub_le_to_cpu32 (header.flags) & GRUB_GELI_FLAGS_BOOT))
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{
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grub_dprintf ("geli", "not a boot volume\n");
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return NULL;
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}
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gcry_err = make_uuid (&header, uuid);
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if (gcry_err)
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{
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grub_crypto_gcry_error (gcry_err);
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return NULL;
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}
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if (check_uuid && grub_strcasecmp (check_uuid, uuid) != 0)
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{
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grub_dprintf ("geli", "%s != %s\n", uuid, check_uuid);
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return NULL;
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}
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if (grub_le_to_cpu16 (header.alg) >= ARRAY_SIZE (algorithms)
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|| algorithms[grub_le_to_cpu16 (header.alg)] == NULL)
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{
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grub_error (GRUB_ERR_FILE_NOT_FOUND, "Cipher 0x%x unknown",
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grub_le_to_cpu16 (header->alg));
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grub_le_to_cpu16 (header.alg));
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return NULL;
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}
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ciphername = algorithms[grub_le_to_cpu16 (header->alg)];
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ciphername = algorithms[grub_le_to_cpu16 (header.alg)];
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ciph = grub_crypto_lookup_cipher_by_name (ciphername);
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if (!ciph)
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{
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@ -236,17 +301,17 @@ configure_ciphers (const struct grub_geli_phdr *header)
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if (!cipher)
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return NULL;
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if (grub_le_to_cpu16 (header->alg) == 0x16)
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if (grub_le_to_cpu16 (header.alg) == 0x16)
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{
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secondary_cipher = grub_crypto_cipher_open (ciph);
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if (!secondary_cipher)
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return NULL;
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}
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if (grub_le_to_cpu16 (header->keylen) > 1024)
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if (grub_le_to_cpu16 (header.keylen) > 1024)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid keysize %d",
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grub_le_to_cpu16 (header->keylen));
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grub_le_to_cpu16 (header.keylen));
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return NULL;
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}
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@ -258,7 +323,7 @@ configure_ciphers (const struct grub_geli_phdr *header)
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newdev->offset = 0;
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newdev->source_disk = NULL;
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newdev->benbi_log = 0;
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if (grub_le_to_cpu16 (header->alg) == 0x16)
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if (grub_le_to_cpu16 (header.alg) == 0x16)
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{
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newdev->mode = GRUB_CRYPTODISK_MODE_XTS;
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newdev->mode_iv = GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64;
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@ -274,25 +339,29 @@ configure_ciphers (const struct grub_geli_phdr *header)
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newdev->iv_hash = GRUB_MD_SHA256;
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for (newdev->log_sector_size = 0;
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(1U << newdev->log_sector_size) < grub_le_to_cpu32 (header->sector_size);
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(1U << newdev->log_sector_size) < grub_le_to_cpu32 (header.sector_size);
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newdev->log_sector_size++);
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if (grub_le_to_cpu32 (header->version) >= 5)
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if (grub_le_to_cpu32 (header.version) >= 5)
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{
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newdev->rekey = geli_rekey;
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newdev->rekey_shift = 20;
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}
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#ifdef GRUB_UTIL
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newdev->modname = "geli";
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#endif
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newdev->total_length = grub_disk_get_size (disk) - 1;
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grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
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COMPILE_TIME_ASSERT (sizeof (newdev->uuid) >= 32 * 2 + 1);
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return newdev;
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}
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static grub_err_t
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recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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const char *name, grub_disk_t source __attribute__ ((unused)))
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recover_key (grub_disk_t source, grub_cryptodisk_t dev)
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{
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grub_size_t keysize = grub_le_to_cpu16 (header->keylen) / 8;
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grub_size_t keysize;
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grub_uint8_t digest[dev->hash->mdlen];
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grub_uint8_t geomkey[dev->hash->mdlen];
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grub_uint8_t verify_key[dev->hash->mdlen];
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@ -300,25 +369,45 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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char passphrase[MAX_PASSPHRASE] = "";
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unsigned i;
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gcry_err_code_t gcry_err;
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struct grub_geli_phdr header;
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char *tmp;
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grub_disk_addr_t sector;
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grub_err_t err;
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sector = grub_disk_get_size (source);
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if (sector == GRUB_DISK_SIZE_UNKNOWN || sector == 0)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
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/* Read the GELI header. */
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err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
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if (err)
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return err;
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keysize = grub_le_to_cpu16 (header.keylen) / 8;
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grub_memset (zero, 0, sizeof (zero));
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grub_printf ("Attempting to decrypt master key...\n");
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/* Get the passphrase from the user. */
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grub_printf ("Enter passphrase for %s (%s): ", name, dev->uuid);
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tmp = NULL;
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if (source->partition)
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tmp = grub_partition_get_name (source->partition);
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grub_printf ("Enter passphrase for %s%s%s (%s): ", source->name,
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source->partition ? "," : "", tmp ? : "",
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dev->uuid);
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grub_free (tmp);
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if (!grub_password_get (passphrase, MAX_PASSPHRASE))
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "Passphrase not supplied");
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/* Calculate the PBKDF2 of the user supplied passphrase. */
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if (grub_le_to_cpu32 (header->niter) != 0)
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if (grub_le_to_cpu32 (header.niter) != 0)
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{
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grub_uint8_t pbkdf_key[64];
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gcry_err = grub_crypto_pbkdf2 (dev->hash, (grub_uint8_t *) passphrase,
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grub_strlen (passphrase),
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header->salt,
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sizeof (header->salt),
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grub_le_to_cpu32 (header->niter),
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header.salt,
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sizeof (header.salt),
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grub_le_to_cpu32 (header.niter),
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pbkdf_key, sizeof (pbkdf_key));
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if (gcry_err)
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@ -337,7 +426,7 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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if (!hnd)
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return grub_crypto_gcry_error (GPG_ERR_OUT_OF_MEMORY);
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grub_crypto_hmac_write (hnd, header->salt, sizeof (header->salt));
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grub_crypto_hmac_write (hnd, header.salt, sizeof (header.salt));
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grub_crypto_hmac_write (hnd, passphrase, grub_strlen (passphrase));
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gcry_err = grub_crypto_hmac_fini (hnd, geomkey);
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@ -358,13 +447,13 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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grub_dprintf ("geli", "keylen = %" PRIuGRUB_SIZE "\n", keysize);
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/* Try to recover master key from each active keyslot. */
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for (i = 0; i < ARRAY_SIZE (header->keys); i++)
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for (i = 0; i < ARRAY_SIZE (header.keys); i++)
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{
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struct grub_geli_key candidate_key;
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grub_uint8_t key_hmac[dev->hash->mdlen];
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/* Check if keyslot is enabled. */
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if (! (header->keys_used & (1 << i)))
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if (! (header.keys_used & (1 << i)))
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continue;
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grub_dprintf ("geli", "Trying keyslot %d\n", i);
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@ -375,7 +464,7 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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return grub_crypto_gcry_error (gcry_err);
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gcry_err = grub_crypto_cbc_decrypt (dev->cipher, &candidate_key,
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&header->keys[i],
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&header.keys[i],
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sizeof (candidate_key),
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zero);
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if (gcry_err)
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@ -398,7 +487,7 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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if (!dev->rekey)
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{
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grub_size_t real_keysize = keysize;
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if (grub_le_to_cpu16 (header->alg) == 0x16)
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if (grub_le_to_cpu16 (header.alg) == 0x16)
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real_keysize *= 2;
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gcry_err = grub_cryptodisk_setkey (dev, candidate_key.cipher_key,
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real_keysize);
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@ -408,7 +497,7 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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else
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{
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grub_size_t real_keysize = keysize;
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if (grub_le_to_cpu16 (header->alg) == 0x16)
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if (grub_le_to_cpu16 (header.alg) == 0x16)
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real_keysize *= 2;
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/* For a reason I don't know, the IV key is used in rekeying. */
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grub_memcpy (dev->rekey_key, candidate_key.iv_key,
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@ -431,216 +520,17 @@ recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
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return GRUB_ACCESS_DENIED;
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}
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static void
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close (grub_cryptodisk_t luks)
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{
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grub_crypto_cipher_close (luks->cipher);
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grub_crypto_cipher_close (luks->secondary_cipher);
|
||||
grub_crypto_cipher_close (luks->essiv_cipher);
|
||||
grub_free (luks);
|
||||
}
|
||||
|
||||
static grub_err_t
|
||||
grub_geli_scan_device_real (const char *name, grub_disk_t source)
|
||||
{
|
||||
grub_err_t err;
|
||||
struct grub_geli_phdr header;
|
||||
grub_cryptodisk_t newdev, dev;
|
||||
grub_disk_addr_t sector;
|
||||
|
||||
grub_dprintf ("geli", "scanning %s\n", source->name);
|
||||
dev = grub_cryptodisk_get_by_source_disk (source);
|
||||
|
||||
if (dev)
|
||||
return GRUB_ERR_NONE;
|
||||
|
||||
sector = grub_disk_get_size (source);
|
||||
if (sector == GRUB_DISK_SIZE_UNKNOWN)
|
||||
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
|
||||
|
||||
/* Read the LUKS header. */
|
||||
err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
newdev = configure_ciphers (&header);
|
||||
if (!newdev)
|
||||
return grub_errno;
|
||||
|
||||
newdev->total_length = grub_disk_get_size (source) - 1;
|
||||
|
||||
err = recover_key (newdev, &header, name, source);
|
||||
if (err)
|
||||
{
|
||||
close (newdev);
|
||||
return err;
|
||||
}
|
||||
|
||||
grub_cryptodisk_insert (newdev, name, source);
|
||||
|
||||
have_it = 1;
|
||||
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
|
||||
#ifdef GRUB_UTIL
|
||||
grub_err_t
|
||||
grub_geli_cheat_mount (const char *sourcedev, const char *cheat)
|
||||
{
|
||||
grub_err_t err;
|
||||
struct grub_geli_phdr header;
|
||||
grub_cryptodisk_t newdev, dev;
|
||||
grub_disk_t source;
|
||||
grub_disk_addr_t sector;
|
||||
|
||||
/* Try to open disk. */
|
||||
source = grub_disk_open (sourcedev);
|
||||
if (!source)
|
||||
return grub_errno;
|
||||
|
||||
dev = grub_cryptodisk_get_by_source_disk (source);
|
||||
|
||||
if (dev)
|
||||
{
|
||||
grub_disk_close (source);
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
|
||||
sector = grub_disk_get_size (source);
|
||||
if (sector == GRUB_DISK_SIZE_UNKNOWN)
|
||||
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
|
||||
|
||||
/* Read the LUKS header. */
|
||||
err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
newdev = configure_ciphers (&header);
|
||||
if (!newdev)
|
||||
{
|
||||
grub_disk_close (source);
|
||||
return grub_errno;
|
||||
}
|
||||
|
||||
newdev->total_length = grub_disk_get_size (source) - 1;
|
||||
|
||||
err = grub_cryptodisk_cheat_insert (newdev, sourcedev, source, cheat);
|
||||
grub_disk_close (source);
|
||||
if (err)
|
||||
grub_free (newdev);
|
||||
|
||||
return err;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int
|
||||
grub_geli_scan_device (const char *name)
|
||||
{
|
||||
grub_err_t err;
|
||||
grub_disk_t source;
|
||||
|
||||
/* Try to open disk. */
|
||||
source = grub_disk_open (name);
|
||||
if (!source)
|
||||
return grub_errno;
|
||||
|
||||
err = grub_geli_scan_device_real (name, source);
|
||||
|
||||
grub_disk_close (source);
|
||||
|
||||
if (err)
|
||||
grub_print_error ();
|
||||
return have_it && check_uuid ? 0 : 1;
|
||||
}
|
||||
|
||||
#ifdef GRUB_UTIL
|
||||
|
||||
void
|
||||
grub_util_geli_print_uuid (grub_disk_t disk)
|
||||
{
|
||||
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
|
||||
grub_printf ("%s ", dev->uuid);
|
||||
}
|
||||
#endif
|
||||
|
||||
static grub_err_t
|
||||
grub_cmd_gelimount (grub_extcmd_context_t ctxt, int argc, char **args)
|
||||
{
|
||||
struct grub_arg_list *state = ctxt->state;
|
||||
|
||||
if (argc < 1 && !state[1].set && !state[2].set)
|
||||
return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
|
||||
|
||||
have_it = 0;
|
||||
if (state[0].set)
|
||||
{
|
||||
grub_cryptodisk_t dev;
|
||||
|
||||
dev = grub_cryptodisk_get_by_uuid (args[0]);
|
||||
if (dev)
|
||||
{
|
||||
grub_dprintf ("luks", "already mounted as crypto%lu\n", dev->id);
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
|
||||
check_uuid = 1;
|
||||
check_boot = state[2].set;
|
||||
search_uuid = args[0];
|
||||
grub_device_iterate (&grub_geli_scan_device);
|
||||
search_uuid = NULL;
|
||||
|
||||
if (!have_it)
|
||||
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such luks found");
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
else if (state[1].set || (argc == 0 && state[2].set))
|
||||
{
|
||||
check_uuid = 0;
|
||||
search_uuid = NULL;
|
||||
check_boot = state[2].set;
|
||||
grub_device_iterate (&grub_geli_scan_device);
|
||||
search_uuid = NULL;
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
else
|
||||
{
|
||||
grub_err_t err;
|
||||
grub_disk_t disk;
|
||||
grub_cryptodisk_t dev;
|
||||
|
||||
check_uuid = 0;
|
||||
search_uuid = NULL;
|
||||
check_boot = state[2].set;
|
||||
disk = grub_disk_open (args[0]);
|
||||
if (!disk)
|
||||
return grub_errno;
|
||||
|
||||
dev = grub_cryptodisk_get_by_source_disk (disk);
|
||||
if (dev)
|
||||
{
|
||||
grub_dprintf ("luks", "already mounted as luks%lu\n", dev->id);
|
||||
grub_disk_close (disk);
|
||||
return GRUB_ERR_NONE;
|
||||
}
|
||||
|
||||
err = grub_geli_scan_device_real (args[0], disk);
|
||||
|
||||
grub_disk_close (disk);
|
||||
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
static grub_extcmd_t cmd;
|
||||
struct grub_cryptodisk_dev geli_crypto = {
|
||||
.scan = configure_ciphers,
|
||||
.recover_key = recover_key
|
||||
};
|
||||
|
||||
GRUB_MOD_INIT (geli)
|
||||
{
|
||||
cmd = grub_register_extcmd ("gelimount", grub_cmd_gelimount, 0,
|
||||
N_("SOURCE|-u UUID|-a|-b"),
|
||||
N_("Mount a GELI device."), options);
|
||||
grub_cryptodisk_dev_register (&geli_crypto);
|
||||
}
|
||||
|
||||
GRUB_MOD_FINI (geli)
|
||||
{
|
||||
grub_unregister_extcmd (cmd);
|
||||
grub_cryptodisk_dev_unregister (&geli_crypto);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue