ChristopherSchultz commented on code in PR #681:
URL: https://github.com/apache/tomcat/pull/681#discussion_r1431618064
##########
java/org/apache/catalina/filters/CsrfPreventionFilter.java:
##########
@@ -53,6 +58,25 @@ public class CsrfPreventionFilter extends
CsrfPreventionFilterBase {
private String nonceRequestParameterName =
Constants.CSRF_NONCE_REQUEST_PARAM;
+ private boolean enforce = true;
+
+ private Collection<Predicate<String>> noNoncePatterns =
DEFAULT_NO_NONCE_URL_PATTERNS;
+
+ private static final Collection<Predicate<String>>
DEFAULT_NO_NONCE_URL_PATTERNS;
+
+ static {
+ ArrayList<Predicate<String>> defaultNoNonceURLPatterns = new
ArrayList<>();
+
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".css"));
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".js"));
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".gif"));
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".png"));
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".jpg"));
+ defaultNoNonceURLPatterns.add(new SuffixPredicate(".svg"));
+
+ DEFAULT_NO_NONCE_URL_PATTERNS =
Collections.unmodifiableList(defaultNoNonceURLPatterns);
Review Comment:
> Might this be better handled by looking at content type rather than file
extension?
All we have to go on is the path of the file, so I don't think we can check
the content-type. Remember, this is primarily being used inside of
`CsrfResponseWrapper.encodeURL(String)` where we know nothing about the file
other than the path.
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