public void verifyRedirectBindingSignature(PublicKey publicKey, String paramKey)
throws VerificationException {
String request = facade.getRequest().getQueryParamValue(paramKey);
String algorithm =
facade.getRequest().getQueryParamValue(GeneralConstants.SAML_SIG_ALG_REQUEST_KEY);
String signature =
facade.getRequest().getQueryParamValue(GeneralConstants.SAML_SIGNATURE_REQUEST_KEY);
String decodedAlgorithm =
facade.getRequest().getQueryParamValue(GeneralConstants.SAML_SIG_ALG_REQUEST_KEY);
if (request == null) {
throw new VerificationException("SAML Request was null");
}
if (algorithm == null) throw new VerificationException("SigAlg was null");
if (signature == null) throw new VerificationException("Signature was null");
// Shibboleth doesn't sign the document for redirect binding.
// todo maybe a flag?
String relayState = facade.getRequest().getQueryParamValue(GeneralConstants.RELAY_STATE);
KeycloakUriBuilder builder = KeycloakUriBuilder.fromPath("/").queryParam(paramKey, request);
if (relayState != null) {
builder.queryParam(GeneralConstants.RELAY_STATE, relayState);
}
builder.queryParam(GeneralConstants.SAML_SIG_ALG_REQUEST_KEY, algorithm);
String rawQuery = builder.build().getRawQuery();
try {
// byte[] decodedSignature = RedirectBindingUtil.urlBase64Decode(signature);
byte[] decodedSignature = Base64.decode(signature);
SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.getFromXmlMethod(decodedAlgorithm);
Signature validator = signatureAlgorithm.createSignature(); // todo plugin signature alg
validator.initVerify(publicKey);
validator.update(rawQuery.getBytes("UTF-8"));
if (!validator.verify(decodedSignature)) {
throw new VerificationException("Invalid query param signature");
}
} catch (Exception e) {
throw new VerificationException(e);
}
}
