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

@@ -20,7 +20,9 @@
import java.net.URI;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Pattern;
@@ -149,7 +151,7 @@

    // any access to parent folder /../ is unsafe with or without encoding
    private final static Pattern UNSAFE_PATH_PATTERN = Pattern.compile(
            "(/|%2[fF]|%5[cC]|\\\\)(%2[eE]|\\.){2}(/|%2[fF]|%5[cC]|\\\\)|(/|%2[fF]|%5[cC]|\\\\)(%2[eE]|\\.){2}$");
            "(/|%2[fF]|%5[cC]|\\\\)(%2[eE]|\\.){2}(/|%2[fF]|%5[cC]|\\\\|;)|(/|%2[fF]|%5[cC]|\\\\)(%2[eE]|\\.){2}$");

    private static boolean areWildcardsAllowed(URI redirectUri) {
        // wildcars are only allowed if no user-info and no unsafe pattern in path
@@ -178,22 +180,57 @@
            if ("*".equals(validRedirect)) {
                // the valid redirect * is a full wildcard for http(s) even if the redirect URI does not allow wildcards
                return validRedirect;
            } else if (validRedirect.endsWith("*") && !validRedirect.contains("?") && allowWildcards) {
                // strip off the query or fragment components - we don't check them when wildcards are effective
                int idx = redirect.indexOf('?');
                if (idx == -1) {
                    idx = redirect.indexOf('#');
            } else {
                String validRedirectWildcard = allowWildcards ? checkValidRedirectWildcard(validRedirect) : null;
                if (validRedirectWildcard != null) {
                    // strip off the query or fragment components - we don't check them when wildcards are effective
                    int idx = redirect.indexOf('?');
                    if (idx == -1) {
                        idx = redirect.indexOf('#');
                    }
                    String r = idx == -1 ? redirect : redirect.substring(0, idx);
                    // strip off *
                    int length = validRedirectWildcard.length() - 1;
                    validRedirectWildcard = validRedirectWildcard.substring(0, length);
                    if (r.startsWith(validRedirectWildcard)) {
                        return validRedirectWildcard;
                    }
                    // strip off trailing '/'
                    if (length - 1 > 0 && validRedirectWildcard.charAt(length - 1) == '/') {
                        length--;
                    }
                    validRedirectWildcard = validRedirectWildcard.substring(0, length);
                    if (validRedirectWildcard.equals(r)) {
                        return validRedirectWildcard;
                    }
                } else if (validRedirect.equals(redirect)) {
                    return validRedirect;
                }
                String r = idx == -1 ? redirect : redirect.substring(0, idx);
                // strip off *
                int length = validRedirect.length() - 1;
                validRedirect = validRedirect.substring(0, length);
                if (r.startsWith(validRedirect)) return validRedirect;
                // strip off trailing '/'
                if (length - 1 > 0 && validRedirect.charAt(length - 1) == '/') length--;
                validRedirect = validRedirect.substring(0, length);
                if (validRedirect.equals(r)) return validRedirect;
            } else if (validRedirect.equals(redirect)) return validRedirect;
            }
        }
        return null;
    }

    private static String checkValidRedirectWildcard(String validRedirect) {
        if (!validRedirect.endsWith("*") || validRedirect.contains("?") || validRedirect.contains("#")) {
            return null; // no wildcard as before
        }
        KeycloakUriBuilder uriBuilder = KeycloakUriBuilder.fromUri(validRedirect, false);
        if (uriBuilder.getPath() != null) {
            return validRedirect; // wildcard valid on path
        }
        if (uriBuilder.getAuthority() != null) {
            if (uriBuilder.getAuthority().equals("*") || uriBuilder.getAuthority().endsWith(":*")) {
                return validRedirect; // on authority just full wildcard or on port
            } else {
                // treat the wildcard after the authority
                validRedirect = validRedirect.substring(0, validRedirect.length() - 1);
                validRedirect = validRedirect + "/*";
                return validRedirect;
            }
        }
        if (uriBuilder.getSsp() != null) {
            return validRedirect; // wildcard valid on SSP
        }
        return null;
    }
@@ -214,4 +251,29 @@
        }
        return redirectUri;
    }

    public static Set<String> resolveUrlsWithRedirects(KeycloakSession session, List<String> origUrls,
                                                       String rootUrl, List<String> redirectUris, boolean returnAsOrigins) {

        Set<String> refactoredUrls = (origUrls != null) ? new HashSet<>(origUrls) : new HashSet<>();
        if (refactoredUrls.contains(Constants.INCLUDE_REDIRECTS)) {
            refactoredUrls.remove(Constants.INCLUDE_REDIRECTS);

            Set<String> redirectsToProcess = (redirectUris != null) ? new HashSet<>(redirectUris) : Collections.emptySet();
            for (String redirectUri : resolveValidRedirects(session, rootUrl, redirectsToProcess)) {
                if (isValidScheme(redirectUri)) {
                    if (returnAsOrigins) {
                        refactoredUrls.add(UriUtils.getOrigin(redirectUri));
                    } else {
                        refactoredUrls.add(redirectUri);
                    }
                }
            }
        }
        return refactoredUrls;
    }

    private static boolean isValidScheme(String url) {
        return url != null && (url.startsWith("http://") || url.startsWith("https://"));
    }
}