KEYCLOAK-3429 Fix behaviour of redirect_uri parameter with query components

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

@@ -77,7 +77,7 @@
        } else {
            redirectUri = lowerCaseHostname(redirectUri);

            String r = redirectUri.indexOf('?') != -1 ? redirectUri.substring(0, redirectUri.indexOf('?')) : redirectUri;
            String r = redirectUri;
            Set<String> resolveValidRedirects = resolveValidRedirects(uriInfo, rootUrl, validRedirects);

            boolean valid = matchesRedirects(resolveValidRedirects, r);
@@ -134,15 +134,17 @@

    private static boolean matchesRedirects(Set<String> validRedirects, String redirect) {
        for (String validRedirect : validRedirects) {
            if (validRedirect.endsWith("*")) {
            if (validRedirect.endsWith("*") && !validRedirect.contains("?")) {
                // strip off the query component - we don't check them when wildcards are effective
                String r = redirect.contains("?") ? redirect.substring(0, redirect.indexOf("?")) : redirect;
                // strip off *
                int length = validRedirect.length() - 1;
                validRedirect = validRedirect.substring(0, length);
                if (redirect.startsWith(validRedirect)) return true;
                if (r.startsWith(validRedirect)) return true;
                // strip off trailing '/'
                if (length - 1 > 0 && validRedirect.charAt(length - 1) == '/') length--;
                validRedirect = validRedirect.substring(0, length);
                if (validRedirect.equals(redirect)) return true;
                if (validRedirect.equals(r)) return true;
            } else if (validRedirect.equals(redirect)) return true;
        }
        return false;