1 files changed, 62 insertions, 0 deletions
diff --git a/cmd_key.c b/cmd_key.c
new file mode 100644
index 00000000..587ecbe3
--- /dev/null
+++ b/cmd_key.c
@@ -0,0 +1,62 @@
+#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;
+}