Release 2.3.0

New features:

- (Experimental) Added `authenticatorAttachment` property to response
  objects:
  - NOTE: Experimental features may receive breaking changes without a
    major version increase.
  - Added method `getAuthenticatorAttachment()` to
    `PublicKeyCredential` and corresponding builder method
    `authenticatorAttachment(AuthenticatorAttachment)`.
  - Added method `getAuthenticatorAttachment()` to
    `RegistrationResult` and `AssertionResult`, which echo
    `getAuthenticatorAttachment()` from the corresponding
    `PublicKeyCredential`.
  - Thanks to GitHub user luisgoncalves for the contribution, see
    #250

Other:

- Fixed the README description of SemVer exceptions: `@Deprecated`
  features are still part of the public API unless they also have an
  `EXPERIMENTAL:` tag in JavaDoc.
- Brought `com.yubico.webauthn` package JavaDoc up to date with new
  library features.

NEWS

@@ -1,3 +1,28 @@
+== Version 2.3.0 ==
+
+New features:
+
+* (Experimental) Added `authenticatorAttachment` property to response objects:
+ ** NOTE: Experimental features may receive breaking changes without a major
+    version increase.
+ ** Added method `getAuthenticatorAttachment()` to `PublicKeyCredential` and
+    corresponding builder method
+    `authenticatorAttachment(AuthenticatorAttachment)`.
+ ** Added method `getAuthenticatorAttachment()` to `RegistrationResult` and
+    `AssertionResult`, which echo `getAuthenticatorAttachment()` from the
+    corresponding `PublicKeyCredential`.
+ ** Thanks to GitHub user luisgoncalves for the contribution, see
+    https://github.com/Yubico/java-webauthn-server/pull/250
+
+Other:
+
+* Fixed the README description of SemVer exceptions: `@Deprecated` features are
+  still part of the public API unless they also have an `EXPERIMENTAL:` tag in
+  JavaDoc.
+* Brought `com.yubico.webauthn` package JavaDoc up to date with new library
+  features.
+
+
 == Version 2.2.0 ==
 
 `webauthn-server-core`:
@@ -44,7 +69,7 @@ Fixes:
 
 Fixes:
 
-* Improved documentation of guaranteed provided by `FidoMetadataDownloader` and
+* Improved documentation of guarantees provided by `FidoMetadataDownloader` and
   required of its parameters.
 
 

build.gradle

@@ -4,7 +4,7 @@ buildscript {
   }
   dependencies {
     classpath 'com.cinnober.gradle:semver-git:2.5.0'
-    classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.12.1'
     classpath 'io.github.cosmicsilence:gradle-scalafix:0.1.13'
   }
 }
@@ -257,6 +257,19 @@ subprojects { project ->
 
 }
 
+// Configure cross-links from webauthn-server-attestation JavaDoc to core JavaDoc
+project(':webauthn-server-attestation').tasks.javadoc {
+  var coreProj = project(':webauthn-server-core')
+  var coreJavadoc = coreProj.tasks.javadoc
+  inputs.files coreJavadoc.outputs.files
+
+  // These links won't work locally, but they will work on developers.yubico.com
+  options.linksOffline("../../webauthn-server-core/${coreProj.version}", "${coreJavadoc.destinationDir}")
+
+  // Use this instead for local testing
+  //options.linksOffline("file://${coreJavadoc.destinationDir}", "${coreJavadoc.destinationDir}")
+}
+
 // The root project has no sources, but the dependency platform also needs to be published as an artifact
 // See https://docs.gradle.org/current/userguide/java_platform_plugin.html
 // See https://github.com/Yubico/java-webauthn-server/issues/93#issuecomment-822806951

buildSrc/build.gradle.kts

@@ -7,5 +7,5 @@ repositories {
 }
 
 dependencies {
-  implementation("info.solidsoft.gradle.pitest:gradle-pitest-plugin:1.9.0")
+  implementation("info.solidsoft.gradle.pitest:gradle-pitest-plugin:1.9.11")
 }

webauthn-server-core/src/main/java/com/yubico/webauthn/AssertionResult.java

@@ -29,6 +29,7 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.yubico.webauthn.data.AuthenticatorAssertionExtensionOutputs;
 import com.yubico.webauthn.data.AuthenticatorAssertionResponse;
+import com.yubico.webauthn.data.AuthenticatorAttachment;
 import com.yubico.webauthn.data.AuthenticatorData;
 import com.yubico.webauthn.data.ByteArray;
 import com.yubico.webauthn.data.ClientAssertionExtensionOutputs;
@@ -195,6 +196,20 @@ public boolean isBackedUp() {
     return credentialResponse.getResponse().getParsedAuthenticatorData().getFlags().BS;
   }
 
+  /**
+   * The <a href="https://w3c.github.io/webauthn/#authenticator-attachment-modality">authenticator
+   * attachment modality</a> in effect at the time the asserted credential was used.
+   *
+   * @see PublicKeyCredential#getAuthenticatorAttachment()
+   * @deprecated EXPERIMENTAL: This feature is from a not yet mature standard; it could change as
+   *     the standard matures.
+   */
+  @Deprecated
+  @JsonIgnore
+  public Optional<AuthenticatorAttachment> getAuthenticatorAttachment() {
+    return credentialResponse.getAuthenticatorAttachment();
+  }
+
   /**
    * The new <a href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#signcount">signature
    * count</a> of the credential used for the assertion.

webauthn-server-core/src/main/java/com/yubico/webauthn/RegistrationResult.java

@@ -31,6 +31,7 @@
 import com.yubico.webauthn.RelyingParty.RelyingPartyBuilder;
 import com.yubico.webauthn.attestation.AttestationTrustSource;
 import com.yubico.webauthn.data.AttestationType;
+import com.yubico.webauthn.data.AuthenticatorAttachment;
 import com.yubico.webauthn.data.AuthenticatorAttestationResponse;
 import com.yubico.webauthn.data.AuthenticatorRegistrationExtensionOutputs;
 import com.yubico.webauthn.data.ByteArray;
@@ -175,6 +176,20 @@ public boolean isBackedUp() {
     return credential.getResponse().getParsedAuthenticatorData().getFlags().BS;
   }
 
+  /**
+   * The <a href="https://w3c.github.io/webauthn/#authenticator-attachment-modality">authenticator
+   * attachment modality</a> in effect at the time the credential was created.
+   *
+   * @see PublicKeyCredential#getAuthenticatorAttachment()
+   * @deprecated EXPERIMENTAL: This feature is from a not yet mature standard; it could change as
+   *     the standard matures.
+   */
+  @Deprecated
+  @JsonIgnore
+  public Optional<AuthenticatorAttachment> getAuthenticatorAttachment() {
+    return credential.getAuthenticatorAttachment();
+  }
+
   /**
    * The signature count returned with the created credential.
    *

webauthn-server-core/src/main/java/com/yubico/webauthn/data/AuthenticatorAttachment.java

@@ -26,7 +26,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
-import java.util.Optional;
 import java.util.stream.Stream;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -73,18 +72,8 @@ public enum AuthenticatorAttachment {
 
   @JsonValue @Getter @NonNull private final String value;
 
-  private static Optional<AuthenticatorAttachment> fromString(@NonNull String value) {
-    return Stream.of(values()).filter(v -> v.value.equals(value)).findAny();
-  }
-
   @JsonCreator
   private static AuthenticatorAttachment fromJsonString(@NonNull String value) {
-    return fromString(value)
-        .orElseThrow(
-            () ->
-                new IllegalArgumentException(
-                    String.format(
-                        "Unknown %s value: %s",
-                        AuthenticatorAttachment.class.getSimpleName(), value)));
+    return Stream.of(values()).filter(v -> v.value.equals(value)).findAny().orElse(null);
   }
 }

webauthn-server-core/src/main/java/com/yubico/webauthn/data/PublicKeyCredential.java

@@ -25,11 +25,16 @@
 package com.yubico.webauthn.data;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.yubico.internal.util.JacksonCodecs;
+import com.yubico.webauthn.AssertionResult;
+import com.yubico.webauthn.FinishAssertionOptions;
+import com.yubico.webauthn.FinishRegistrationOptions;
+import com.yubico.webauthn.RegistrationResult;
+import com.yubico.webauthn.RelyingParty;
 import java.io.IOException;
+import java.util.Optional;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.NonNull;
@@ -46,7 +51,6 @@
  */
 @Value
 @Builder(toBuilder = true)
-@JsonIgnoreProperties({"authenticatorAttachment"})
 public class PublicKeyCredential<
     A extends AuthenticatorResponse, B extends ClientExtensionOutputs> {
 
@@ -68,6 +72,8 @@ public class PublicKeyCredential<
    */
   @NonNull private final A response;
 
+  private final AuthenticatorAttachment authenticatorAttachment;
+
   /**
    * A map containing extension identifier → client extension output entries produced by the
    * extension’s client extension processing.
@@ -83,6 +89,7 @@ private PublicKeyCredential(
       @JsonProperty("id") ByteArray id,
       @JsonProperty("rawId") ByteArray rawId,
       @NonNull @JsonProperty("response") A response,
+      @JsonProperty("authenticatorAttachment") AuthenticatorAttachment authenticatorAttachment,
       @NonNull @JsonProperty("clientExtensionResults") B clientExtensionResults,
       @NonNull @JsonProperty("type") PublicKeyCredentialType type) {
     if (id == null && rawId == null) {
@@ -95,16 +102,41 @@ private PublicKeyCredential(
 
     this.id = id == null ? rawId : id;
     this.response = response;
+    this.authenticatorAttachment = authenticatorAttachment;
     this.clientExtensionResults = clientExtensionResults;
     this.type = type;
   }
 
   private PublicKeyCredential(
       ByteArray id,
       @NonNull A response,
+      AuthenticatorAttachment authenticatorAttachment,
       @NonNull B clientExtensionResults,
       @NonNull PublicKeyCredentialType type) {
-    this(id, null, response, clientExtensionResults, type);
+    this(id, null, response, authenticatorAttachment, clientExtensionResults, type);
+  }
+
+  /**
+   * The <a href="https://w3c.github.io/webauthn/#authenticator-attachment-modality">authenticator
+   * attachment modality</a> in effect at the time the credential was created or used.
+   *
+   * <p>If parsed from JSON, this will be present if and only if the input was a valid value of
+   * {@link AuthenticatorAttachment}.
+   *
+   * <p>The same value will also be available via {@link
+   * RegistrationResult#getAuthenticatorAttachment()} or {@link
+   * AssertionResult#getAuthenticatorAttachment()} on the result from {@link
+   * RelyingParty#finishRegistration(FinishRegistrationOptions)} or {@link
+   * RelyingParty#finishAssertion(FinishAssertionOptions)}.
+   *
+   * @see RegistrationResult#getAuthenticatorAttachment()
+   * @see AssertionResult#getAuthenticatorAttachment()
+   * @deprecated EXPERIMENTAL: This feature is from a not yet mature standard; it could change as
+   *     the standard matures.
+   */
+  @Deprecated
+  public Optional<AuthenticatorAttachment> getAuthenticatorAttachment() {
+    return Optional.ofNullable(authenticatorAttachment);
   }
 
   public static <A extends AuthenticatorResponse, B extends ClientExtensionOutputs>

webauthn-server-core/src/main/java/com/yubico/webauthn/package-info.java

@@ -1,5 +1,5 @@
 /**
- * This package makes up the public API of the webauthn-server-core library.
+ * This package and its subpackages make up the public API of the webauthn-server-core library.
  *
  * <p>The main entry point is the {@link com.yubico.webauthn.RelyingParty} class. It provides
  * methods for generating inputs to the <code>navigator.credentials.create()</code> and <code>
@@ -82,15 +82,22 @@
  * com.yubico.webauthn.data.PublicKeyCredentialCreationOptions} which can be serialized to JSON and
  * passed as the <code>publicKey</code> argument to <code>navigator.credentials.create()</code>. You
  * can use the {@link com.yubico.webauthn.data.PublicKeyCredentialCreationOptions#toBuilder()
- * toBuilder()} method to make any modifications you need. You should store this in temporary
- * storage so that it can later be passed as an argument to {@link
- * com.yubico.webauthn.RelyingParty#finishRegistration(FinishRegistrationOptions)}.
- *
- * <p>After receiving the response from the client, construct a {@link
- * com.yubico.webauthn.data.PublicKeyCredential}&lt;{@link
- * com.yubico.webauthn.data.AuthenticatorAttestationResponse}, {@link
- * com.yubico.webauthn.data.ClientRegistrationExtensionOutputs}&gt; from the response and wrap that
- * in a {@link com.yubico.webauthn.FinishRegistrationOptions} along with the {@link
+ * toBuilder()} method to make any modifications you need, then the {@link
+ * com.yubico.webauthn.data.PublicKeyCredentialCreationOptions#toCredentialsCreateJson()} method is
+ * suitable for converting the value to JSON to send to the client.
+ *
+ * <p>You should also store the {@link com.yubico.webauthn.data.PublicKeyCredentialCreationOptions}
+ * object in temporary storage so that it can later be passed as an argument to {@link
+ * com.yubico.webauthn.RelyingParty#finishRegistration(FinishRegistrationOptions)}. If you need to
+ * serialize the object for storage, the {@link
+ * com.yubico.webauthn.data.PublicKeyCredentialCreationOptions#toJson()} and {@link
+ * com.yubico.webauthn.data.PublicKeyCredentialCreationOptions#fromJson(java.lang.String)} methods
+ * are suitable for serializing to and from a string value.
+ *
+ * <p>After receiving the response from the client, use the {@link
+ * com.yubico.webauthn.data.PublicKeyCredential#parseRegistrationResponseJson(java.lang.String)}
+ * function to parse the response and wrap it in a {@link
+ * com.yubico.webauthn.FinishRegistrationOptions} along with the {@link
  * com.yubico.webauthn.data.PublicKeyCredentialCreationOptions} used to initiate the request. Pass
  * that as the argument to {@link
  * com.yubico.webauthn.RelyingParty#finishRegistration(FinishRegistrationOptions)}, which will
@@ -107,14 +114,19 @@
  *       com.yubico.webauthn.RegistrationResult#getPublicKeyCose() publicKeyCose} as a new
  *       credential for the user. The {@link com.yubico.webauthn.CredentialRepository} will need to
  *       look these up for authentication.
+ *   <li>Store the {@link com.yubico.webauthn.RegistrationResult#getSignatureCount() signature
+ *       counter} value in the new credential. If available, this will be used in future
+ *       authentication ceremonies do detect authenticator cloning.
+ *   <li>Optionally, store the {@link com.yubico.webauthn.RegistrationResult#isDiscoverable()
+ *       isDiscoverable} flag, if present, in the new credential. This may help you determine which
+ *       user interaction flows are possible with which credential.
  *   <li>If you care about authenticator attestation, check that the {@link
  *       com.yubico.webauthn.RegistrationResult#isAttestationTrusted() attestationTrusted} field
  *       satisfies your attestation policy. For this you will likely need to configure the {@link
  *       com.yubico.webauthn.RelyingParty.RelyingPartyBuilder#attestationTrustSource(com.yubico.webauthn.attestation.AttestationTrustSource)
  *       attestationTrustSource} setting on your {@link com.yubico.webauthn.RelyingParty} instance.
- *       You may also want to consult some external data source to verify the authenticity of the
- *       {@link com.yubico.webauthn.data.AuthenticatorAttestationResponse#getAttestationObject()
- *       attestation object}.
+ *       See also the <code>webauthn-server-attestation</code> for an implementation of such an
+ *       attestation trust and metadata source.
  *   <li>If you care about authenticator attestation, it is recommended to also store the raw {@link
  *       com.yubico.webauthn.data.AuthenticatorAttestationResponse#getAttestationObject()
  *       attestation object} as part of the credential. This enables you to retroactively inspect
@@ -130,11 +142,13 @@
  * com.yubico.webauthn.RelyingParty#startAssertion(StartAssertionOptions)}. The main parameter you
  * need to set here is the {@link
  * com.yubico.webauthn.StartAssertionOptions.StartAssertionOptionsBuilder#username(java.util.Optional)
- * username} of the user to authenticate, but even this parameter is optional. If the username is
- * not set, then the {@link
+ * username} or {@link
+ * com.yubico.webauthn.StartAssertionOptions.StartAssertionOptionsBuilder#userHandle(java.util.Optional)
+ * user handle} of the user to authenticate, but even these parameters are optional. If neither is
+ * set, then the {@link
  * com.yubico.webauthn.data.PublicKeyCredentialRequestOptions#getAllowCredentials()
- * allowCredentials} parameter will not be set. This which means the user must use a <a
- * href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#client-side-discoverable-public-key-credential-source">client-side-resident
+ * allowCredentials} parameter will not be set. This means the user must use a <a
+ * href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#client-side-discoverable-public-key-credential-source">client-side-discoverable
  * credential</a> to authenticate; also known as "first-factor authentication". This use case has
  * both advantages and disadvantages; see the Web Authentication specification for an extended
  * discussion of this.
@@ -143,18 +157,21 @@
  * startAssertion} method returns an {@link com.yubico.webauthn.AssertionRequest} containing the
  * username, if any, and a {@link com.yubico.webauthn.data.PublicKeyCredentialRequestOptions}
  * instance which can be serialized to JSON and passed as the <code>publicKey</code> argument to
- * <code>navigator.credentials.get()</code>. Again, store the {@link
- * com.yubico.webauthn.AssertionRequest} in temporary storage so it can be passed as an argument to
- * {@link
+ * <code>navigator.credentials.get()</code>. Again, use {@link
+ * com.yubico.webauthn.AssertionRequest#toBuilder()} to make any necessary changes, {@link
+ * com.yubico.webauthn.AssertionRequest#toCredentialsGetJson()} to convert it to JSON for sending to
+ * the client, and store the {@link com.yubico.webauthn.AssertionRequest} in temporary storage so it
+ * can be passed as an argument to {@link
  * com.yubico.webauthn.RelyingParty#finishAssertion(com.yubico.webauthn.FinishAssertionOptions)}.
- *
- * <p>After receiving the response from the client, construct a {@link
- * com.yubico.webauthn.data.PublicKeyCredential}&lt;{@link
- * com.yubico.webauthn.data.AuthenticatorAssertionResponse}, {@link
- * com.yubico.webauthn.data.ClientAssertionExtensionOutputs}&gt; from the response and wrap that in
- * a {@link com.yubico.webauthn.FinishAssertionOptions} along with the {@link
- * com.yubico.webauthn.AssertionRequest} used to initiate the request. Pass that as the argument to
- * {@link
+ * Again, {@link com.yubico.webauthn.AssertionRequest#toJson()} and {@link
+ * com.yubico.webauthn.AssertionRequest#fromJson(java.lang.String)} can be used to convert to and
+ * from JSON for storage.
+ *
+ * <p>After receiving the response from the client, use {@link
+ * com.yubico.webauthn.data.PublicKeyCredential#parseAssertionResponseJson(java.lang.String)} to
+ * parse the response, then wrap that in a {@link com.yubico.webauthn.FinishAssertionOptions} along
+ * with the {@link com.yubico.webauthn.AssertionRequest} used to initiate the request. Pass that as
+ * the argument to {@link
  * com.yubico.webauthn.RelyingParty#finishAssertion(com.yubico.webauthn.FinishAssertionOptions)},
  * which will return an {@link com.yubico.webauthn.AssertionResult} if successful and throw an
  * exception if not. Regardless of whether it succeeds, you should remove the {@link