[PM-4756] [PM-4755] Add BE and BS flags, and credProps (#7947)

* [PM-4756] feat: set BE and BS flags

* [PM-4755] feat: add support for credProps.rk

* [PM-4755] feat: add extension support to page-script object mapping

apps/browser/src/vault/fido2/webauthn-utils.ts

@@ -33,7 +33,9 @@ export class WebauthnUtils {
         transports: credential.transports,
         type: credential.type,
       })),
-      extensions: undefined, // extensions not currently supported
+      extensions: {
+        credProps: keyOptions.extensions?.credProps,
+      },
       pubKeyCredParams: keyOptions.pubKeyCredParams.map((params) => ({
         alg: params.alg,
         type: params.type,
@@ -78,7 +80,9 @@ export class WebauthnUtils {
           return result.transports;
         },
       } as AuthenticatorAttestationResponse,
-      getClientExtensionResults: () => ({}),
+      getClientExtensionResults: () => ({
+        credProps: result.extensions.credProps,
+      }),
     } as PublicKeyCredential;
 
     // Modify prototype chains to fix `instanceof` calls.

libs/common/src/vault/abstractions/fido2/fido2-client.service.abstraction.ts

@@ -80,13 +80,12 @@ export interface CreateCredentialParams {
   }[];
   /**
    * This member contains additional parameters requesting additional processing by the client and authenticator.
-   * Not currently supported.
    **/
   extensions?: {
-    appid?: string;
-    appidExclude?: string;
+    appid?: string; // Not supported
+    appidExclude?: string; // Not supported
+    uvm?: boolean; // Not supported
     credProps?: boolean;
-    uvm?: boolean;
   };
   /**
    * This member contains information about the desired properties of the credential to be created.
@@ -125,6 +124,11 @@ export interface CreateCredentialResult {
   publicKey: string;
   publicKeyAlgorithm: number;
   transports: string[];
+  extensions: {
+    credProps?: {
+      rk: boolean;
+    };
+  };
 }
 
 /**

libs/common/src/vault/services/fido2/fido2-authenticator.service.spec.ts

@@ -362,7 +362,7 @@ describe("FidoAuthenticatorService", () => {
             0xd0, 0x5c, 0x3d, 0xc3,
           ]),
         );
-        expect(flags).toEqual(new Uint8Array([0b01000001])); // UP = true, AD = true
+        expect(flags).toEqual(new Uint8Array([0b01011001])); // UP = true, AT = true, BE = true, BS = true
         expect(counter).toEqual(new Uint8Array([0, 0, 0, 0])); // 0 because of new counter
         expect(aaguid).toEqual(AAGUID);
         expect(credentialIdLength).toEqual(new Uint8Array([0, 16])); // 16 bytes because we're using GUIDs
@@ -697,7 +697,7 @@ describe("FidoAuthenticatorService", () => {
             0xd0, 0x5c, 0x3d, 0xc3,
           ]),
         );
-        expect(flags).toEqual(new Uint8Array([0b00000001])); // UP = true
+        expect(flags).toEqual(new Uint8Array([0b00011001])); // UP = true, BE = true, BS = true
         expect(counter).toEqual(new Uint8Array([0, 0, 0x23, 0x29])); // 9001 in hex
 
         // Verify signature

libs/common/src/vault/services/fido2/fido2-authenticator.service.ts

@@ -444,6 +444,8 @@ async function generateAuthData(params: AuthDataParams) {
   const flags = authDataFlags({
     extensionData: false,
     attestationData: params.keyPair != undefined,
+    backupEligibility: true,
+    backupState: true, // Credentials are always synced
     userVerification: params.userVerification,
     userPresence: params.userPresence,
   });
@@ -522,6 +524,8 @@ async function generateSignature(params: SignatureParams) {
 interface Flags {
   extensionData: boolean;
   attestationData: boolean;
+  backupEligibility: boolean;
+  backupState: boolean;
   userVerification: boolean;
   userPresence: boolean;
 }
@@ -537,6 +541,14 @@ function authDataFlags(options: Flags): number {
     flags |= 0b01000000;
   }
 
+  if (options.backupEligibility) {
+    flags |= 0b00001000;
+  }
+
+  if (options.backupState) {
+    flags |= 0b00010000;
+  }
+
   if (options.userVerification) {
     flags |= 0b00000100;
   }

libs/common/src/vault/services/fido2/fido2-client.service.spec.ts

@@ -207,6 +207,42 @@ describe("FidoAuthenticatorService", () => {
         );
       });
 
+      it("should return credProps.rk = true when creating a discoverable credential", async () => {
+        const params = createParams({
+          authenticatorSelection: { residentKey: "required", userVerification: "required" },
+          extensions: { credProps: true },
+        });
+        authenticator.makeCredential.mockResolvedValue(createAuthenticatorMakeResult());
+
+        const result = await client.createCredential(params, tab);
+
+        expect(result.extensions.credProps?.rk).toBe(true);
+      });
+
+      it("should return credProps.rk = false when creating a non-discoverable credential", async () => {
+        const params = createParams({
+          authenticatorSelection: { residentKey: "discouraged", userVerification: "required" },
+          extensions: { credProps: true },
+        });
+        authenticator.makeCredential.mockResolvedValue(createAuthenticatorMakeResult());
+
+        const result = await client.createCredential(params, tab);
+
+        expect(result.extensions.credProps?.rk).toBe(false);
+      });
+
+      it("should return credProps = undefiend when the extension is not requested", async () => {
+        const params = createParams({
+          authenticatorSelection: { residentKey: "required", userVerification: "required" },
+          extensions: {},
+        });
+        authenticator.makeCredential.mockResolvedValue(createAuthenticatorMakeResult());
+
+        const result = await client.createCredential(params, tab);
+
+        expect(result.extensions.credProps).toBeUndefined();
+      });
+
       // Spec: If any authenticator returns an error status equivalent to "InvalidStateError", Return a DOMException whose name is "InvalidStateError" and terminate this algorithm.
       it("should throw error if authenticator throws InvalidState", async () => {
         const params = createParams();

libs/common/src/vault/services/fido2/fido2-client.service.ts

@@ -192,6 +192,13 @@ export class Fido2ClientService implements Fido2ClientServiceAbstraction {
       throw new DOMException("The operation either timed out or was not allowed.", "AbortError");
     }
 
+    let credProps;
+    if (params.extensions?.credProps) {
+      credProps = {
+        rk: makeCredentialParams.requireResidentKey,
+      };
+    }
+
     clearTimeout(timeout);
     return {
       credentialId: Fido2Utils.bufferToString(makeCredentialResult.credentialId),
@@ -201,6 +208,7 @@ export class Fido2ClientService implements Fido2ClientServiceAbstraction {
       publicKey: Fido2Utils.bufferToString(makeCredentialResult.publicKey),
       publicKeyAlgorithm: makeCredentialResult.publicKeyAlgorithm,
       transports: params.rp.id === "google.com" ? ["internal", "usb"] : ["internal"],
+      extensions: { credProps },
     };
   }