Sebastian Götz created WW-5415:
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Summary: Struts2 Validator is failing in OGNL with constructor call
Key: WW-5415
URL: https://issues.apache.org/jira/browse/WW-5415
Project: Struts 2
Issue Type: Bug
Components: Core
Affects Versions: 6.3.0, 6.2.0
Reporter: Sebastian Götz
Fix For: 6.5.0
An FieldExpression validator using a constructor call in its OGNL expression
fails.
{code:java|title=Example validation configuration}
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xml, yaml<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd";>
<validators>
<field name="employee.birthday">
<field-validator type="fieldexpression">
<param name="expression"><![CDATA[
( employee.birthday == null || employee.birthday.before(new
java.util.Date()))
]]></param>
<message key="errors_birthday" />
</field-validator>
</field>
</validators> {code}
When it comes to instantiate the Date object in the above example, the call
fails in com.opensymphony.xwork2.ognl.SecurityMemberAccess.isAccessible(Map,
Object, Member, String). It seems that a constructor call is not handled here
properly.
{code:java}
public boolean isAccessible(Map context, Object target, Member member, String
propertyName) {
LOG.debug("Checking access for [target: {}, member: {}, property: {}]",
target, member, propertyName);
final int memberModifiers = member.getModifiers();
final Class<?> memberClass = member.getDeclaringClass();
// target can be null in case of accessing static fields, since OGNL
3.2.8
final Class<?> targetClass = Modifier.isStatic(memberModifiers) ?
memberClass : target.getClass();
if (!memberClass.isAssignableFrom(targetClass)) {
throw new IllegalArgumentException("Target does not match member!");
}
{code}
When the method is called,
* {{*target*}} is the class object for {{{}java.util.Date{}}}
* {{*member*}} is a representation of the constructor {{public
java.util.Date()}}
* {{*propertyName*}} is null
* {{*memberModifiers*}} evaluates to 1
* {{*memberClass*}} to the class object for {{{}java.util.Date{}}}
This causes the if to resolve to {{false}} and throwing the exception. I cannot
see how anyone could call any constructor at all.
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