src/main/java/org/keycloak/protocol/cas/utils/RedirectUtils.java

@@ -28,7 +28,6 @@
import org.keycloak.services.util.ResolveRelative;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
@@ -84,8 +83,18 @@
        KeycloakUriInfo uriInfo = session.getContext().getUri();
        RealmModel realm = session.getContext().getRealm();

        if (redirectUri != null)
            redirectUri = normalizeUrl(redirectUri);
        if (redirectUri != null) {
            try {
                URI uri = URI.create(redirectUri);
                redirectUri = uri.normalize().toString();
            } catch (IllegalArgumentException cause) {
                logger.debug("Invalid redirect uri", cause);
                return null;
            } catch (Exception cause) {
                logger.debug("Unexpected error when parsing redirect uri", cause);
                return null;
            }
        }

        if (redirectUri == null) {
            if (!requireRedirectUri) {
@@ -179,19 +188,26 @@
    private static String getSingleValidRedirectUri(Collection<String> validRedirects) {
        if (validRedirects.size() != 1) return null;
        String validRedirect = validRedirects.iterator().next();
        int idx = validRedirect.indexOf("/*");
        if (idx > -1) {
            validRedirect = validRedirect.substring(0, idx);
        }
        return validRedirect;
        return validateRedirectUriWildcard(validRedirect);
    }

    private static String normalizeUrl(String url) {
        try {
            URI uri = new URI(url);
            return uri.normalize().toString();
        } catch (URISyntaxException e) {
            throw new IllegalArgumentException("Invalid URL syntax: " + e.getMessage());
    public static String validateRedirectUriWildcard(String redirectUri) {
        if (redirectUri == null)
            return null;

        int idx = redirectUri.indexOf("/*");
        if (idx > -1) {
            redirectUri = redirectUri.substring(0, idx);
        }
        return redirectUri;
    }

    private static String getFirstValidRedirectUri(Collection<String> validRedirects) {
        final String redirectUri = validRedirects.stream().findFirst().orElse(null);
        return (redirectUri != null) ? validateRedirectUriWildcard(redirectUri) : null;
    }

    public static String getFirstValidRedirectUri(KeycloakSession session, String rootUrl, Set<String> validRedirects) {
        return getFirstValidRedirectUri(resolveValidRedirects(session, rootUrl, validRedirects));
    }
}