ppkarwasz commented on code in PR #636:
URL:
https://github.com/apache/commons-configuration/pull/636#discussion_r3225938844
##########
src/main/java/org/apache/commons/configuration2/io/AbstractFileLocationStrategy.java:
##########
@@ -204,6 +205,55 @@ public T get() {
*/
private static final String KEY_SCHEMES =
"org.apache.commons.configuration2.io.FileLocationStrategy.schemes";
+ private static void checkHost(String value, final Set<Pattern> validSet) {
+ final String lowerCase = StringUtils.toRootLowerCase(value);
+ if (!validSet.isEmpty() && StringUtils.isNotEmpty(lowerCase) &&
validSet.stream().noneMatch(p -> p.matcher(lowerCase).matches())) {
+ throw new ConfigurationDeniedException("URL host is not enabled:
%s; must be one of %s", value, validSet);
+ }
+ }
+
+ /**
+ * Checks if the scheme is allowed.
+ *
+ * @param value A URL scheme, never empty or {@code null}.
+ * @param validSet the scheme allow-set.
+ */
+ private static void checkScheme(final String value, final Set<String>
validSet) {
+ if (!validSet.isEmpty() &&
!validSet.contains(StringUtils.toRootLowerCase(value))) {
+ throw new ConfigurationDeniedException("URL scheme \"%s\" is not
enabled, must be one of %s, override defaults with the system property \"%s\", "
+ + "complete set: \"file,http,https,jar\"", value,
validSet, KEY_SCHEMES);
+ }
+ }
+
+ /**
+ * Validates {@code url} against the scheme and host allow-lists.
+ *
+ * @param url the URL to check.
+ * @param validSchemes the scheme allow-set.
+ * @param validHosts the host allow-set.
+ * @throws ConfigurationDeniedException if the URL or any embedded URL
fails the check, or a {@code jar:} URL is malformed.
+ */
+ static void checkUrl(final URL url, final Set<String> validSchemes, final
Set<Pattern> validHosts) {
+ String scheme = url.getProtocol();
+ checkScheme(scheme, validSchemes);
+ if ("jar".equalsIgnoreCase(scheme)) {
+ try {
+ // Follows the logic of JarURLConnection#parseSpecs without
the cost of opening a connection.
+ final String spec = url.getFile();
+ final int sep = spec.lastIndexOf("!/");
+ if (sep < 0) {
+ throw new MalformedURLException("no !/ found in url spec:"
+ spec);
Review Comment:
The message intentionally matches the one in `JarURLConnection`:
https://github.com/openjdk/jdk/blob/4edfc387f160dfeb8a67408b1bd98ea45f51d36c/src/java.base/share/classes/java/net/JarURLConnection.java#L167
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