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https://issues.apache.org/jira/browse/WW-5184?focusedWorklogId=778114&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-778114
]
ASF GitHub Bot logged work on WW-5184:
--------------------------------------
Author: ASF GitHub Bot
Created on: 03/Jun/22 14:39
Start Date: 03/Jun/22 14:39
Worklog Time Spent: 10m
Work Description: brianandle commented on code in PR #557:
URL: https://github.com/apache/struts/pull/557#discussion_r889007979
##########
core/src/main/java/com/opensymphony/xwork2/interceptor/ParametersInterceptor.java:
##########
@@ -335,7 +392,85 @@ protected boolean isExcluded(String paramName) {
}
return false;
}
+
+
+ public void setAcceptedValuePatterns(String commaDelimitedPatterns) {
+ Set<String> patterns =
TextParseUtil.commaDelimitedStringToSet(commaDelimitedPatterns);
+ if (acceptedValuePatterns == null) {
+ // Limit unwanted log entries (for 1st call, acceptedPatterns null)
+ LOG.debug("Sets accepted value patterns to [{}], note this impacts
the safety of your application!", patterns);
+ } else {
+ LOG.warn("Replacing accepted patterns [{}] with [{}], be aware
that this affects all instances and safety of your application!",
+ acceptedValuePatterns, patterns);
+ }
+ acceptedValuePatterns = new HashSet<>(patterns.size());
+ try {
+ for (String pattern : patterns) {
+ acceptedValuePatterns.add(Pattern.compile(pattern,
Pattern.CASE_INSENSITIVE));
+ }
+ } finally {
+ acceptedValuePatterns =
Collections.unmodifiableSet(acceptedValuePatterns);
+ }
+ }
+
+ public void setExcludeValuePatterns(String commaDelimitedPatterns) {
+ Set<String> patterns =
TextParseUtil.commaDelimitedStringToSet(commaDelimitedPatterns);
+ if (excludedValuePatterns == null) {
+ // Limit unwanted log entries (for 1st call, acceptedPatterns null)
+ LOG.debug("Setting excluded value patterns to [{}]", patterns);
+ } else {
+ LOG.warn("Replacing accepted patterns [{}] with [{}], be aware
that this affects all instances and safety of your application!",
+ excludedValuePatterns, patterns);
+ }
+ excludedValuePatterns = new HashSet<>(patterns.size());
+ try {
+ for (String pattern : patterns) {
+ excludedValuePatterns.add(Pattern.compile(pattern,
Pattern.CASE_INSENSITIVE));
+ }
+ } finally {
+ excludedValuePatterns =
Collections.unmodifiableSet(excludedValuePatterns);
+ }
+ }
+
+ protected boolean isParamValueExcluded(String value) {
+ if(excludedValuePatterns != null) {
+ for (Pattern excludedPattern : excludedValuePatterns) {
+ if(value != null) {
+ if (excludedPattern.matcher(value).matches()) {
+ LOG.trace("[{}] matches excluded pattern [{}]",
value, excludedPattern);
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+ }
+ protected boolean isParamValueAccepted(String value) {
+ if(acceptedValuePatterns != null) {
+ for (Pattern excludedPattern : acceptedValuePatterns) {
+ if(value != null) {
+ if (excludedPattern.matcher(value).matches()) {
+ LOG.trace("[{}] matches excluded pattern [{}]",
value, excludedPattern);
+ return true;
+ }
+ }
+ }
+ } else {
+ // acceptedValuePatterns not defined so anything is allowed
+ return true;
+ }
+ return false;
Review Comment:
Done
Issue Time Tracking
-------------------
Worklog Id: (was: 778114)
Time Spent: 1h (was: 50m)
> Add optional parameter value check to ParametersInterceptor
> -----------------------------------------------------------
>
> Key: WW-5184
> URL: https://issues.apache.org/jira/browse/WW-5184
> Project: Struts 2
> Issue Type: Improvement
> Reporter: Brian Andle
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> It is known that developers utilizing Struts/Freemarker should always ensure
> proper sanitization to prevent OGNL/Freemarker evaluation on untrusted user
> input when %{/$\{ in FTL being passed into Struts tags.
> These patterns aren't always practical to resolve/find especially in legacy
> code. This isn't a solely a legacy code of course it's just as easy to make a
> mistake in newer code as well.
> The following would end up rendering 81
> Payload:
> {code:java}
> untrustedInput=%25%7B9%2A9%7D {code}
> FTL:
>
> {code:java}
> <@s.form theme="simple" action="${untrustedInput}" id="myForm4">
> </@s.form> {code}
>
> Java:
> {code:java}
> private String untrustedInput;
> public String getUntrustedInput() {
> return untrustedInput;
> }
> public void setUntrustedInput(String untrustedInput) {
> this.untrustedInput = untrustedInput;
> } {code}
>
> This ticket is to add an optional `params.excludeValuePatterns` so that
> ParametersInterceptor can drop incoming parameter itself if the value matches
> a pattern to be excluded.
>
> {code:java}
> <param
> name="params.excludeValuePatterns">.*\$\{.*?\}.*,.*%\{.*?\}.*</param>{code}
>
> Since this is a pattern and would be executed against the values themselves
> there is the potential of a performance impact however I since it's optional
> we shouldn't see any measurable impact when not enabled.
>
> *NOTE:* I did add a `params.acceptValuePatterns` pattern that is
> null/disabled by default. This might not ever be used but mimic'd the Pattern
> matcher the ParametersInterceptor/CookieInterceptor.
>
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