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#include <errno.h>
#include <unistd.h>
#include <keyutils.h>
#include <uuid/uuid.h>
#include "cmds.h"
#include "checksum.h"
#include "crypto.h"
#include "libbcache.h"
int cmd_unlock(int argc, char *argv[])
{
struct bch_encrypted_key sb_key;
struct bch_key passphrase_key;
struct bch_sb *sb;
struct bch_sb_field_crypt *crypt;
char *passphrase;
char uuid[40];
char description[60];
if (argc != 2)
die("please supply a single device");
sb = bcache_super_read(argv[1]);
crypt = bch_sb_get_crypt(sb);
if (!crypt)
die("filesystem is not encrypted");
sb_key = crypt->key;
if (!bch_key_is_encrypted(&sb_key))
die("filesystem does not have encryption key");
passphrase = read_passphrase("Enter passphrase: ");
derive_passphrase(crypt, &passphrase_key, passphrase);
/* Check if the user supplied the correct passphrase: */
if (bch_chacha_encrypt_key(&passphrase_key, __bch_sb_key_nonce(sb),
&sb_key, sizeof(sb_key)))
die("error encrypting key");
if (bch_key_is_encrypted(&sb_key))
die("incorrect passphrase");
uuid_unparse_lower(sb->user_uuid.b, uuid);
sprintf(description, "bcache:%s", uuid);
if (add_key("logon", description,
&passphrase_key, sizeof(passphrase_key),
KEY_SPEC_USER_KEYRING) < 0 ||
add_key("user", description,
&passphrase_key, sizeof(passphrase_key),
KEY_SPEC_USER_KEYRING) < 0)
die("add_key error: %s", strerror(errno));
memzero_explicit(&sb_key, sizeof(sb_key));
memzero_explicit(&passphrase_key, sizeof(passphrase_key));
memzero_explicit(passphrase, strlen(passphrase));
free(passphrase);
return 0;
}
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