src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java

@@ -18,6 +18,7 @@
import org.keycloak.services.managers.UserSessionCrossDCManager;
import org.keycloak.services.util.DefaultClientSessionContext;

import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.HexFormat;
@@ -228,16 +229,26 @@
    }

    protected void createProxyGrant(String pgtUrl) {
        if ( RedirectUtils.verifyRedirectUri(session, pgtUrl, client) == null ) {
        String verifiedPgtUrl = RedirectUtils.verifyRedirectUri(session, pgtUrl, client);
        if (verifiedPgtUrl == null) {
            event.error(Errors.INVALID_REQUEST);
            throw new CASValidationException(CASErrorCode.INVALID_PROXY_CALLBACK, "Proxy callback is invalid", Response.Status.BAD_REQUEST);
        }

        // The callback receives a PGT, so require HTTPS unless the realm's "Require SSL" setting allows plain HTTP for the host
        URI pgtUri = URI.create(verifiedPgtUrl);
        boolean isHttps = "https".equalsIgnoreCase(pgtUri.getScheme());
        boolean isHttp = "http".equalsIgnoreCase(pgtUri.getScheme());
        if (pgtUri.getHost() == null || !(isHttps || (isHttp && !realm.getSslRequired().isRequired(pgtUri.getHost())))) {
            event.error(Errors.INVALID_REQUEST);
            throw new CASValidationException(CASErrorCode.INVALID_PROXY_CALLBACK, "Proxy callback must use HTTPS", Response.Status.BAD_REQUEST);
        }

        String pgtIou = getPGTIOU();
        String pgtId  = getPGT(session, clientSession, pgtUrl);
        String pgtId  = getPGT(session, clientSession, verifiedPgtUrl);

        try {
            HttpGet request = new HttpGet(new URIBuilder(pgtUrl).setParameter("pgtIou",pgtIou).setParameter("pgtId",pgtId).build());
            HttpGet request = new HttpGet(new URIBuilder(verifiedPgtUrl).setParameter("pgtIou",pgtIou).setParameter("pgtId",pgtId).build());
            request.setConfig(PGT_CALLBACK_REQUEST_CONFIG);

            HttpClient httpClient = session.getProvider(HttpClientProvider.class).getHttpClient();