Examples with AndroidSafetyNetAttestationStatement com.webauthn4j.data.attestation.statement.AndroidSafetyNetAttestationStatement used on opensource projects

Example 1 with AndroidSafetyNetAttestationStatement

use of com.webauthn4j.data.attestation.statement.AndroidSafetyNetAttestationStatement in project webauthn4j by webauthn4j.

the class AndroidSafetyNetAttestationStatementValidator method validate.

@SuppressWarnings("ConstantConditions")
@Override
@NonNull
public AttestationType validate(@NonNull CoreRegistrationObject registrationObject) {
    AssertUtil.notNull(registrationObject, "registrationObject must not be null");
    if (!supports(registrationObject)) {
        throw new IllegalArgumentException("Specified format is not supported by " + this.getClass().getName());
    }
    AndroidSafetyNetAttestationStatement attestationStatement = (AndroidSafetyNetAttestationStatement) registrationObject.getAttestationObject().getAttestationStatement();
    validateAttestationStatementNotNull(attestationStatement);
    if (attestationStatement.getX5c().isEmpty()) {
        throw new BadAttestationStatementException("No attestation certificate is found in android safetynet attestation statement.");
    }
    // / Given the verification procedure inputs attStmt, authenticatorData and clientDataHash,
    // the verification procedure is as follows:
    // / Verify that attStmt is valid CBOR conforming to the syntax defined above and perform CBOR decoding on it
    // to extract the contained fields.
    // / Verify that response is a valid SafetyNet response of version ver.
    versionValidator.validate(attestationStatement.getVer());
    // / Verify that the nonce in the response is identical to the Base64url encoding of the SHA-256 hash of the concatenation of authenticatorData and clientDataHash.
    Response response = attestationStatement.getResponse().getPayload();
    String nonce = response.getNonce();
    byte[] authenticatorData = registrationObject.getAuthenticatorDataBytes();
    validateNonce(nonce, authenticatorData, registrationObject.getClientDataHash());
    // / Let attestationCert be the attestation certificate.
    // / Verify that attestationCert is issued to the hostname "attest.android.com" (see SafetyNet online documentation).
    AttestationCertificate attestationCertificate = attestationStatement.getX5c().getEndEntityAttestationCertificate();
    if (!Objects.equals(attestationCertificate.getSubjectCommonName(), "attest.android.com")) {
        throw new BadAttestationStatementException("The attestation certificate is not issued to 'attest.android.com'.");
    }
    // / Verify that the ctsProfileMatch attribute in the payload of response is true.
    if (!Objects.equals(response.getCtsProfileMatch(), true)) {
        throw new BadAttestationStatementException("The profile of the device doesn't match the profile of a device that has passed Android Compatibility Test Suite.");
    }
    if (response.getTimestampMs() == null) {
        throw new BadAttestationStatementException("timestampMs is null.");
    }
    // Verify the timestampMs doesn't violate backwardThreshold
    if (Instant.ofEpochMilli(response.getTimestampMs()).isBefore(registrationObject.getTimestamp().minus(Duration.ofSeconds(backwardThreshold)))) {
        throw new BadAttestationStatementException("timestampMs violates backwardThreshold.");
    }
    // Verify the timestampMs doesn't violate forwardThreshold
    if (Instant.ofEpochMilli(response.getTimestampMs()).isAfter(registrationObject.getTimestamp().plus(Duration.ofSeconds(forwardThreshold)))) {
        throw new BadAttestationStatementException("timestampMs violates forwardThreshold.");
    }
    if (!attestationStatement.getResponse().isValidSignature()) {
        throw new BadAttestationStatementException("Android safetynet response in the attestation statement doesn't have a valid signature.");
    }
    // / If successful, return implementation-specific values representing attestation type Basic and attestation trust path attestationCert.
    return AttestationType.BASIC;
}

Example 2 with AndroidSafetyNetAttestationStatement

use of com.webauthn4j.data.attestation.statement.AndroidSafetyNetAttestationStatement in project webauthn4j by webauthn4j.

the class AndroidSafetyNetAuthenticator method createAttestationStatement.

@Override
public AttestationStatement createAttestationStatement(AttestationStatementRequest attestationStatementRequest, RegistrationEmulationOption registrationEmulationOption) {
    AttestationOption attestationOption = registrationEmulationOption.getAttestationOption() == null ? new AndroidSafetyNetAttestationOption() : registrationEmulationOption.getAttestationOption();
    X509Certificate attestationCertificate = getAttestationCertificate(attestationStatementRequest, attestationOption);
    List<X509Certificate> certificates = new ArrayList<>();
    certificates.add(attestationCertificate);
    certificates.addAll(this.getCACertificatePath());
    CertPath certPath = CertificateUtil.generateCertPath(certificates);
    JWSHeader jwsHeader = new JWSHeader(JWAIdentifier.ES256, certPath);
    String nonce = Base64Util.encodeToString(MessageDigestUtil.createSHA256().digest(attestationStatementRequest.getSignedData()));
    long timestampMs = Instant.now().toEpochMilli();
    String apkPackageName = "com.android.keystore.androidkeystoredemo";
    String[] apkCertificateDigestSha256 = new String[] { "bsb4/WQdaaOWYCd/j9OJiQpg7b0iwFgAc/zzA1tCfwE=" };
    String apkDigestSha256 = "dM/LUHSI9SkQhZHHpQWRnzJ3MvvB2ANSauqYAAbS2Jg=";
    boolean ctsProfileMatch = true;
    boolean basicIntegrity = true;
    String advice = null;
    Response response = new Response(nonce, timestampMs, apkPackageName, apkCertificateDigestSha256, apkDigestSha256, ctsProfileMatch, basicIntegrity, advice);
    String ver = "12685023";
    JWS<Response> jws = getJwsFactory().create(jwsHeader, response, this.getAttestationKeyPair().getPrivate());
    if (registrationEmulationOption.isSignatureOverrideEnabled()) {
        jws = getJwsFactory().create(jws.getHeader(), jws.getPayload(), registrationEmulationOption.getSignature());
    }
    return new AndroidSafetyNetAttestationStatement(ver, jws);
}

Example 3 with AndroidSafetyNetAttestationStatement

use of com.webauthn4j.data.attestation.statement.AndroidSafetyNetAttestationStatement in project webauthn4j by webauthn4j.

the class AndroidSafetyNetAttestationStatementValidatorTest method validateAttestationStatementNotNull_test.

@Test
void validateAttestationStatementNotNull_test() {
    String ver = "12685023";
    String nonce = "nonce";
    long timestampMs = Instant.now().toEpochMilli();
    String apkPackageName = "com.android.keystore.androidkeystoredemo";
    String[] apkCertificateDigestSha256 = new String[] { "bsb4/WQdaaOWYCd/j9OJiQpg7b0iwFgAc/zzA1tCfwE=" };
    String apkDigestSha256 = "dM/LUHSI9SkQhZHHpQWRnzJ3MvvB2ANSauqYAAbS2Jg=";
    boolean ctsProfileMatch = true;
    boolean basicIntegrity = true;
    String advice = null;
    Response response = new Response(nonce, timestampMs, apkPackageName, apkCertificateDigestSha256, apkDigestSha256, ctsProfileMatch, basicIntegrity, advice);
    JWS<Response> jws = new JWSFactory().create(new JWSHeader(JWAIdentifier.ES256, CertificateUtil.generateCertPath(Collections.emptyList())), response, new byte[32]);
    AndroidSafetyNetAttestationStatement attestationStatement = new AndroidSafetyNetAttestationStatement(ver, jws);
    target.validateAttestationStatementNotNull(attestationStatement);
}