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-rw-r--r--src/cryptenroll/cryptenroll-fido2.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/cryptenroll/cryptenroll-fido2.c b/src/cryptenroll/cryptenroll-fido2.c
new file mode 100644
index 0000000..80adaef
--- /dev/null
+++ b/src/cryptenroll/cryptenroll-fido2.c
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "cryptenroll-fido2.h"
+#include "hexdecoct.h"
+#include "json.h"
+#include "libfido2-util.h"
+#include "memory-util.h"
+#include "random-util.h"
+
+int enroll_fido2(
+ struct crypt_device *cd,
+ const void *volume_key,
+ size_t volume_key_size,
+ const char *device,
+ Fido2EnrollFlags lock_with,
+ int cred_alg) {
+
+ _cleanup_(erase_and_freep) void *salt = NULL, *secret = NULL;
+ _cleanup_(erase_and_freep) char *base64_encoded = NULL;
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ _cleanup_free_ char *keyslot_as_string = NULL;
+ size_t cid_size, salt_size, secret_size;
+ _cleanup_free_ void *cid = NULL;
+ const char *node, *un;
+ int r, keyslot;
+
+ assert_se(cd);
+ assert_se(volume_key);
+ assert_se(volume_key_size > 0);
+ assert_se(device);
+
+ assert_se(node = crypt_get_device_name(cd));
+
+ un = strempty(crypt_get_uuid(cd));
+
+ r = fido2_generate_hmac_hash(
+ device,
+ /* rp_id= */ "io.systemd.cryptsetup",
+ /* rp_name= */ "Encrypted Volume",
+ /* user_id= */ un, strlen(un), /* We pass the user ID and name as the same: the disk's UUID if we have it */
+ /* user_name= */ un,
+ /* user_display_name= */ node,
+ /* user_icon_name= */ NULL,
+ /* askpw_icon_name= */ "drive-harddisk",
+ lock_with,
+ cred_alg,
+ &cid, &cid_size,
+ &salt, &salt_size,
+ &secret, &secret_size,
+ NULL,
+ &lock_with);
+ if (r < 0)
+ return r;
+
+ /* Before we use the secret, we base64 encode it, for compat with homed, and to make it easier to type in manually */
+ r = base64mem(secret, secret_size, &base64_encoded);
+ if (r < 0)
+ return log_error_errno(r, "Failed to base64 encode secret key: %m");
+
+ r = cryptsetup_set_minimal_pbkdf(cd);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set minimal PBKDF: %m");
+
+ keyslot = crypt_keyslot_add_by_volume_key(
+ cd,
+ CRYPT_ANY_SLOT,
+ volume_key,
+ volume_key_size,
+ base64_encoded,
+ strlen(base64_encoded));
+ if (keyslot < 0)
+ return log_error_errno(keyslot, "Failed to add new FIDO2 key to %s: %m", node);
+
+ if (asprintf(&keyslot_as_string, "%i", keyslot) < 0)
+ return log_oom();
+
+ r = json_build(&v,
+ JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("type", JSON_BUILD_CONST_STRING("systemd-fido2")),
+ JSON_BUILD_PAIR("keyslots", JSON_BUILD_ARRAY(JSON_BUILD_STRING(keyslot_as_string))),
+ JSON_BUILD_PAIR("fido2-credential", JSON_BUILD_BASE64(cid, cid_size)),
+ JSON_BUILD_PAIR("fido2-salt", JSON_BUILD_BASE64(salt, salt_size)),
+ JSON_BUILD_PAIR("fido2-rp", JSON_BUILD_CONST_STRING("io.systemd.cryptsetup")),
+ JSON_BUILD_PAIR("fido2-clientPin-required", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_PIN))),
+ JSON_BUILD_PAIR("fido2-up-required", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UP))),
+ JSON_BUILD_PAIR("fido2-uv-required", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UV)))));
+ if (r < 0)
+ return log_error_errno(r, "Failed to prepare FIDO2 JSON token object: %m");
+
+ r = cryptsetup_add_token_json(cd, v);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add FIDO2 JSON token to LUKS2 header: %m");
+
+ log_info("New FIDO2 token enrolled as key slot %i.", keyslot);
+ return keyslot;
+}