Extensions.java

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.annotation.JsonValue;
import com.upokecenter.cbor.CBORObject;
import com.upokecenter.cbor.CBORType;
import com.yubico.webauthn.StartRegistrationOptions;
import com.yubico.webauthn.extension.uvm.KeyProtectionType;
import com.yubico.webauthn.extension.uvm.MatcherProtectionType;
import com.yubico.webauthn.extension.uvm.UserVerificationMethod;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import lombok.Builder;
import lombok.NonNull;
import lombok.Value;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;

/** Definitions for WebAuthn extensions. */
@Slf4j
@UtilityClass
public class Extensions {

  /**
   * Definitions for the FIDO AppID Extension (<code>appid</code>).
   *
   * @see <a href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-appid-extension">§10.1.
   *     FIDO AppID Extension (appid)</a>
   */
  public static class Appid {
    static final String EXTENSION_ID = "appid";
  }

  /**
   * Definitions for the 10.2. FIDO AppID Exclusion Extension (<code>appidExclude</code>).
   *
   * @see <a
   *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-appid-exclude-extension">10.2.
   *     FIDO AppID Exclusion Extension (appidExclude)</a>
   */
  public static class AppidExclude {
    static final String EXTENSION_ID = "appidExclude";
  }

  /**
   * Definitions for the Credential Properties Extension (<code>credProps</code>).
   *
   * @see <a
   *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-authenticator-credential-properties-extension">§10.4.
   *     Credential Properties Extension (credProps)</a>
   */
  public static class CredentialProperties {
    static final String EXTENSION_ID = "credProps";

    /**
     * Extension outputs for the Credential Properties Extension (<code>credProps</code>).
     *
     * @see <a
     *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-authenticator-credential-properties-extension">§10.4.
     *     Credential Properties Extension (credProps)</a>
     */
    @Value
    @Builder
    @JsonIgnoreProperties(ignoreUnknown = true)
    public static class CredentialPropertiesOutput {
      @JsonProperty("rk")
      private final Boolean rk;

      @JsonCreator
      private CredentialPropertiesOutput(@JsonProperty("rk") Boolean rk) {
        this.rk = rk;
      }

      /**
       * This OPTIONAL property, known abstractly as the <b>resident key credential property</b>
       * (i.e., <b>client-side discoverable credential property</b>), is a Boolean value indicating
       * whether the {@link PublicKeyCredential} returned as a result of a registration ceremony is
       * a <i>client-side discoverable credential</i> (passkey).
       *
       * <p>If this is <code>true</code>, the credential is a <i>discoverable credential</i>
       * (passkey).
       *
       * <p>If this is <code>false</code>, the credential is a <i>server-side credential</i>.
       *
       * <p>If this is not present, it is not known whether the credential is a discoverable
       * credential or a server-side credential.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-credentialpropertiesoutput-rk">§10.4.
       *     Credential Properties Extension (credProps)</a>
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#client-side-discoverable-credential">Client-side
       *     discoverable Credential</a>
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#server-side-credential">Server-side
       *     Credential</a>
       * @see <a href="https://passkeys.dev/docs/reference/terms/#passkey">Passkey</a> in <a
       *     href="https://passkeys.dev">passkeys.dev</a> reference
       */
      public Optional<Boolean> getRk() {
        return Optional.ofNullable(rk);
      }
    }
  }

  /**
   * Definitions for the Large blob storage extension (<code>largeBlob</code>).
   *
   * @see <a
   *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
   *     Large blob storage extension (largeBlob)</a>
   */
  public static class LargeBlob {
    static final String EXTENSION_ID = "largeBlob";

    /**
     * Extension inputs for the Large blob storage extension (<code>largeBlob</code>) in
     * registration ceremonies.
     *
     * @see <a
     *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
     *     Large blob storage extension (largeBlob)</a>
     */
    @Value
    public static class LargeBlobRegistrationInput {
      /**
       * The Relying Party's preference of whether the created credential should support the <code>
       * largeBlob</code> extension.
       */
      @JsonProperty private final LargeBlobSupport support;

      @JsonCreator
      public LargeBlobRegistrationInput(
          /**
           * The Relying Party's preference of whether the created credential should support the
           * <code>
           * largeBlob</code> extension.
           *
           * <p>Currently the only valid values are {@link LargeBlobSupport#REQUIRED} and {@link
           * LargeBlobSupport#PREFERRED}, but custom values MAY be constructed in case more values
           * are added in future revisions of the extension.
           */
          @JsonProperty("support") LargeBlobSupport support) {
        this.support = support;
      }

      /**
       * The known valid arguments for the Large blob storage extension (<code>largeBlob</code>)
       * input in registration ceremonies.
       *
       * <p>Currently the only valid values are {@link LargeBlobSupport#REQUIRED} and {@link
       * LargeBlobSupport#PREFERRED}, but custom values MAY be constructed in case more values are
       * added in future revisions of the extension.
       *
       * @see #REQUIRED
       * @see #PREFERRED
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      @Value
      public static class LargeBlobSupport {
        /**
         * The authenticator used for registration MUST support the <code>largeBlob</code>
         * extension.
         *
         * <p>Note: If the client does not support the <code>largeBlob</code> extension, this
         * requirement MAY be ignored.
         *
         * <p>Note: CTAP authenticators only support <code>largeBlob</code> in combination with
         * {@link AuthenticatorSelectionCriteria#getResidentKey()} set to <code>REQUIRED</code> in
         * {@link StartRegistrationOptions#getAuthenticatorSelection()}.
         *
         * @see <a
         *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
         *     Large blob storage extension (largeBlob)</a>
         */
        public static final LargeBlobSupport REQUIRED = new LargeBlobSupport("required");

        /**
         * If the authenticator used for registration supports the <code>largeBlob</code> extension,
         * it will be enabled for the created credential. If not supported, the credential will be
         * created without large blob support.
         *
         * <p>Note: CTAP authenticators only support <code>largeBlob</code> in combination with
         * {@link AuthenticatorSelectionCriteria#getResidentKey()} set to <code>REQUIRED</code> in
         * {@link StartRegistrationOptions#getAuthenticatorSelection()}.
         *
         * @see <a
         *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
         *     Large blob storage extension (largeBlob)</a>
         */
        public static final LargeBlobSupport PREFERRED = new LargeBlobSupport("preferred");

        /**
         * The underlying string value of this {@link LargeBlobSupport} value.
         *
         * @see #REQUIRED
         * @see #PREFERRED
         */
        @JsonValue private final String value;

        /**
         * Returns a new {@link Set} containing the {@link #REQUIRED} and {@link #PREFERRED} values.
         */
        public static Set<LargeBlobSupport> values() {
          return Stream.of(REQUIRED, PREFERRED).collect(Collectors.toSet());
        }
      }
    }

    /**
     * Extension inputs for the Large blob storage extension (<code>largeBlob</code>) in
     * authentication ceremonies.
     *
     * <p>Use the {@link #read()} and {@link #write(ByteArray)} factory functions to construct this
     * type.
     *
     * @see <a
     *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
     *     Large blob storage extension (largeBlob)</a>
     */
    @Value
    public static class LargeBlobAuthenticationInput {
      /**
       * If <code>true</code>, indicates that the Relying Party would like to fetch the
       * previously-written blob associated with the asserted credential.
       *
       * @see #read()
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-read">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      @JsonProperty private final boolean read;

      /**
       * An opaque byte string that the Relying Party wishes to store with the existing credential.
       *
       * @see #write(ByteArray)
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-write">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      @JsonProperty private final ByteArray write;

      @JsonCreator
      private LargeBlobAuthenticationInput(
          @JsonProperty("read") final Boolean read, @JsonProperty("write") final ByteArray write) {
        if (read != null && read && write != null) {
          throw new IllegalArgumentException(
              "Parameters \"read\" and \"write\" of largeBlob extension must not both be present.");
        }

        this.read = read != null && read;
        this.write = write;
      }

      /**
       * Configure the Large blob storage extension (<code>largeBlob</code>) to fetch the
       * previously-written blob associated with the asserted credential.
       *
       * <p>Mutually exclusive with {@link #write(ByteArray)}.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-read">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public static LargeBlobAuthenticationInput read() {
        return new LargeBlobAuthenticationInput(true, null);
      }

      /**
       * Configure the Large blob storage extension (<code>largeBlob</code>) to store the given byte
       * array with the existing credential.
       *
       * <p>Mutually exclusive with {@link #read()}.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-write">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public static LargeBlobAuthenticationInput write(@NonNull final ByteArray write) {
        return new LargeBlobAuthenticationInput(false, write);
      }

      /**
       * @return <code>true</code> if the <code>read</code> property is set to <code>true</code>,
       *     <code>false</code> otherwise.
       * @see #read()
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-read">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public boolean getRead() {
        return read;
      }

      /**
       * @return The value of the <code>write</code> property if configured, empty otherwise.
       * @see #write(ByteArray)
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargeblobinputs-read">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public Optional<ByteArray> getWrite() {
        return Optional.ofNullable(write);
      }
    }

    /**
     * Extension outputs for the Large blob storage extension (<code>largeBlob</code>) in
     * registration ceremonies.
     *
     * <p>Use the {@link #supported(boolean)} factory function to construct this type.
     *
     * @see <a
     *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
     *     Large blob storage extension (largeBlob)</a>
     */
    @Value
    public static class LargeBlobRegistrationOutput {
      /**
       * <code>true</code> if, and only if, the created credential supports storing large blobs.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargebloboutputs-supported">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       * @see LargeBlobRegistrationInput#getSupport()
       */
      @JsonProperty private final boolean supported;

      @JsonCreator
      private LargeBlobRegistrationOutput(@JsonProperty("supported") boolean supported) {
        this.supported = supported;
      }

      /**
       * Create a Large blob storage extension output with the <code>supported</code> output set to
       * the given value.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dictdef-authenticationextensionslargebloboutputs">
       *     dictionary AuthenticationExtensionsLargeBlobOutputs</a>
       */
      public static LargeBlobRegistrationOutput supported(boolean supported) {
        return new LargeBlobRegistrationOutput(supported);
      }
    }

    /**
     * Extension outputs for the Large blob storage extension (<code>largeBlob</code>) in
     * authentication ceremonies.
     *
     * @see <a
     *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-large-blob-extension">§10.5.
     *     Large blob storage extension (largeBlob)</a>
     */
    @Value
    public static class LargeBlobAuthenticationOutput {
      @JsonProperty private final ByteArray blob;
      @JsonProperty private final Boolean written;

      @JsonCreator
      private LargeBlobAuthenticationOutput(
          @JsonProperty("blob") ByteArray blob, @JsonProperty("written") Boolean written) {
        this.blob = blob;
        this.written = written;
      }

      /**
       * Create a Large blob storage extension output with the <code>blob</code> output set to the
       * given value.
       *
       * <p>This corresponds to the extension input {@link LargeBlobAuthenticationInput#read()
       * LargeBlobAuthenticationInput.read()}.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dictdef-authenticationextensionslargebloboutputs">
       *     dictionary AuthenticationExtensionsLargeBlobOutputs</a>
       */
      public static LargeBlobAuthenticationOutput read(final ByteArray blob) {
        return new LargeBlobAuthenticationOutput(blob, null);
      }

      /**
       * Create a Large blob storage extension output with the <code>written</code> output set to
       * the given value.
       *
       * <p>This corresponds to the extension input {@link
       * LargeBlobAuthenticationInput#write(ByteArray)
       * LargeBlobAuthenticationInput.write(ByteArray)}.
       *
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dictdef-authenticationextensionslargebloboutputs">
       *     dictionary AuthenticationExtensionsLargeBlobOutputs</a>
       */
      public static LargeBlobAuthenticationOutput write(final boolean write) {
        return new LargeBlobAuthenticationOutput(null, write);
      }

      /**
       * The opaque byte string that was associated with the credential identified by {@link
       * PublicKeyCredential#getId()}. Only valid if {@link LargeBlobAuthenticationInput#getRead()}
       * was <code>true</code>.
       *
       * @return A present {@link Optional} if {@link LargeBlobAuthenticationInput#getRead()} was
       *     <code>true</code> and the blob content was successfully read. Otherwise (if {@link
       *     LargeBlobAuthenticationInput#getRead()} was <code>false</code> or the content failed to
       *     be read) an empty {@link Optional}.
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargebloboutputs-blob">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public Optional<ByteArray> getBlob() {
        return Optional.ofNullable(blob);
      }

      /**
       * A boolean that indicates that the contents of {@link
       * LargeBlob.LargeBlobAuthenticationInput#write(ByteArray)
       * LargeBlobAuthenticationInput#write(ByteArray)} were successfully stored on the
       * authenticator, associated with the specified credential.
       *
       * @return Empty if {@link LargeBlobAuthenticationInput#getWrite()} was not present. Otherwise
       *     <code>true</code> if and only if the value of {@link
       *     LargeBlobAuthenticationInput#getWrite()} was successfully stored by the authenticator.
       * @see <a
       *     href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#dom-authenticationextensionslargebloboutputs-written">§10.5.
       *     Large blob storage extension (largeBlob)</a>
       */
      public Optional<Boolean> getWritten() {
        return Optional.ofNullable(written);
      }
    }
  }

  /**
   * Definitions for the User Verification Method (<code>uvm</code>) Extension.
   *
   * @see <a href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-uvm-extension">§10.3.
   *     User Verification Method Extension (uvm)</a>
   */
  public static class Uvm {
    static final String EXTENSION_ID = "uvm";

    /**
     * A <code>uvmEntry</code> as defined in <a
     * href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-uvm-extension">§10.3. User
     * Verification Method Extension (uvm)</a>.
     *
     * @see <a href="https://www.w3.org/TR/2021/REC-webauthn-2-20210408/#sctn-uvm-extension">§10.3.
     *     User Verification Method Extension (uvm)</a>
     * @see UserVerificationMethod
     * @see KeyProtectionType
     * @see MatcherProtectionType
     */
    @Value
    public static class UvmEntry {
      private final UserVerificationMethod userVerificationMethod;
      private final KeyProtectionType keyProtectionType;
      private final MatcherProtectionType matcherProtectionType;

      public UvmEntry(
          @JsonProperty("userVerificationMethod") UserVerificationMethod userVerificationMethod,
          @JsonProperty("keyProtectionType") KeyProtectionType keyProtectionType,
          @JsonProperty("matcherProtectionType") MatcherProtectionType matcherProtectionType) {
        this.userVerificationMethod = userVerificationMethod;
        this.keyProtectionType = keyProtectionType;
        this.matcherProtectionType = matcherProtectionType;
      }
    }

    static Optional<List<UvmEntry>> parseAuthenticatorExtensionOutput(CBORObject cbor) {
      if (validateAuthenticatorExtensionOutput(cbor)) {
        return Optional.of(
            cbor.get(EXTENSION_ID).getValues().stream()
                .map(
                    uvmEntry ->
                        new UvmEntry(
                            UserVerificationMethod.fromValue(uvmEntry.get(0).AsInt32Value()),
                            KeyProtectionType.fromValue(
                                uvmEntry.get(1).AsNumber().ToInt16IfExact()),
                            MatcherProtectionType.fromValue(
                                uvmEntry.get(2).AsNumber().ToInt16IfExact())))
                .collect(Collectors.toList()));
      } else {
        return Optional.empty();
      }
    }

    private static boolean validateAuthenticatorExtensionOutput(CBORObject extensions) {
      if (!extensions.ContainsKey(EXTENSION_ID)) {
        return false;
      }

      CBORObject uvm = extensions.get(EXTENSION_ID);
      if (uvm.getType() != CBORType.Array) {
        log.debug(
            "Invalid CBOR type for \"{}\" extension output: expected array, was: {}",
            EXTENSION_ID,
            uvm.getType());
        return false;
      }

      if (uvm.size() < 1 || uvm.size() > 3) {
        log.debug(
            "Invalid length \"{}\" extension output array: expected 1 to 3 (inclusive), was: {}",
            EXTENSION_ID,
            uvm.size());
        return false;
      }

      for (CBORObject entry : uvm.getValues()) {
        if (entry.getType() != CBORType.Array) {
          log.debug("Invalid CBOR type for uvmEntry: expected array, was: {}", entry.getType());
          return false;
        }

        if (entry.size() != 3) {
          log.debug("Invalid length for uvmEntry: expected 3, was: {}", entry.size());
          return false;
        }

        for (CBORObject i : entry.getValues()) {
          if (!(i.isNumber() && i.AsNumber().IsInteger())) {
            log.debug("Invalid type for uvmEntry element: expected integer, was: {}", i.getType());
            return false;
          }
        }
      }

      return true;
    }
  }
}































Active mutators

CONDITIONALS_BOUNDARY
EMPTY_RETURNS
FALSE_RETURNS
INCREMENTS
INVERT_NEGS
MATH
NEGATE_CONDITIONALS
NULL_RETURNS
PRIMITIVE_RETURNS
TRUE_RETURNS
VOID_METHOD_CALLS
Tests examined

com.yubico.webauthn.data.AuthenticatorDataSpec (92 ms)
com.yubico.webauthn.data.ExtensionsSpec (192 ms)
com.yubico.webauthn.data.BuildersSpec (426 ms)
com.yubico.webauthn.RelyingPartyAssertionSpec (1693 ms)
com.yubico.webauthn.data.JsonIoSpec (4004 ms)
com.yubico.webauthn.RelyingPartyRegistrationSpec (10125 ms)
com.yubico.webauthn.RelyingPartyStartOperationSpec (304 ms)
Report generated by PIT 1.15.0
Extensions.java

Mutations

Active mutators

Tests examined
