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https://issues.apache.org/jira/browse/WW-5698?focusedWorklogId=1038212&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-1038212
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ASF GitHub Bot logged work on WW-5698:
--------------------------------------
Author: ASF GitHub Bot
Created on: 27/Aug/26 06:43
Start Date: 27/Aug/26 06:43
Worklog Time Spent: 10m
Work Description: sonarqubecloud[bot] commented on PR #1872:
URL: https://github.com/apache/struts/pull/1872#issuecomment-5435356635
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Issue Time Tracking
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Worklog Id: (was: 1038212)
Time Spent: 0.5h (was: 20m)
> ModelDriven exemption in StrutsParameterAuthorizer also exempts the action's
> own members
> ----------------------------------------------------------------------------------------
>
> Key: WW-5698
> URL: https://issues.apache.org/jira/browse/WW-5698
> Project: Struts 2
> Issue Type: Task
> Components: Core
> Reporter: Lukasz Lenart
> Assignee: Lukasz Lenart
> Priority: Major
> Fix For: 7.4.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> {{StrutsParameterAuthorizer.isAuthorized(...)}} exempts {{ModelDriven}}
> actions from the {{@StrutsParameter}} requirement:
> {code:java}// ModelDriven exemption: only exempt when the action explicitly
> implements ModelDriven
> // and the target is its model object. ...
> if (target != action && action instanceof ModelDriven) {
> return true;
> }
> {code}
> The intent is sound and is what makes model binding work: implementing
> {{ModelDriven}} and returning an object from {{getModel()}} is a type-level
> declaration that the model is request surface, so its properties do not each
> need annotating.
> The effect is wider than the intent. The method returns {{true}} for _any_
> parameter name, and the name is subsequently resolved by OGNL against the
> whole {{CompoundRoot}}, which holds the model on top of the action.
> Authorization is therefore decided about the model, while the resulting write
> may land on the action. The practical result is that the {{@StrutsParameter}}
> requirement does not apply to an action's own members once that action
> implements {{ModelDriven}}.
> h2. Observed
> Same unannotated setter, declared on the action class in both cases, with
> {{struts.parameters.requireAnnotations=true}}:
> {code}plain action parameter actionSecret=... -> not bound
> (correctly rejected)
> ModelDriven action parameter actionSecret=... -> bound
> {code}
> Both runs also bound a second, expected parameter, confirming the negative
> result is a real rejection rather than a harness that binds nothing.
> A related consequence is that framework members inherited from
> {{ActionSupport}} become reachable on {{ModelDriven}} actions in the same way
> — a parameter name of {{getText('some-key').property}} invokes
> {{ActionSupport.getText(String)}}, which is not annotated and is not part of
> any model. That particular call is inert, since it is a resource bundle
> lookup whose result is discarded, but it illustrates that the exempted
> surface is the whole stack rather than the model.
> h2. Proposed change
> Keep the exemption, but scope it to what it is meant to cover: authorize
> members of the model object, and continue to apply the annotation requirement
> to members of the action itself. {{resolveTarget(...)}} already distinguishes
> the two, so the information needed is present at the decision point.
> h2. Compatibility
> This is a behavioural change. An application with a {{ModelDriven}} action
> that currently relies on binding unannotated members declared on the action
> will stop binding them once the requirement applies, and will need those
> members annotated with {{@StrutsParameter}}. That is the same migration those
> members would have needed had the action not been {{ModelDriven}}, but it is
> still a change for existing applications, so it may belong in 8.0.0 rather
> than 7.4.0, or behind {{struts.parameters.requireAnnotations.transitionMode}}
> for a release. Worth deciding before the change is written.
> Related to WW-5697, which concerns method invocation during binding and has a
> separate cause and a separate fix; the two only overlap in that a
> {{ModelDriven}} action is the easiest way to reach both.
> The exemption is also currently undocumented. Whatever scope it ends up with
> should be stated in the {{@StrutsParameter}} and ModelDriven documentation,
> together with the advice that a model should be a request DTO rather than a
> domain or persistence object.
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