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Remove GET request support from Saml2AuthenticationTokenConverter #17108

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Remove GET request support from Saml2AuthenticationTokenConverter #17108

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ngocnhan-tran1996
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@ngocnhan-tran1996 ngocnhan-tran1996 commented May 14, 2025 •
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I think we can define Boolean shouldInflate and method decode will be added

if (this.shouldInflate == null) {
	this.shouldInflate = HttpMethod.GET.matches(request.getMethod());
}

If not, this will break Saml2LoginBeanDefinitionParserTests and Saml2AuthenticationTokenConverterTests

Saml2LoginBeanDefinitionParserTests > authenticateWhenCustomAuthnRequestRepositoryThenUses() FAILED
    org.mockito.exceptions.verification.WantedButNotInvoked at Saml2LoginBeanDefinitionParserTests.java:323

Saml2LoginBeanDefinitionParserTests > authenticateWhenAuthenticationResponseValidThenAuthenticate() FAILED
    java.lang.AssertionError at Saml2LoginBeanDefinitionParserTests.java:213

Saml2LoginBeanDefinitionParserTests > authenticateWhenAuthenticationResponseValidThenAuthenticationSuccessEventPublished() FAILED
    java.lang.AssertionError at Saml2LoginBeanDefinitionParserTests.java:245

Saml2LoginBeanDefinitionParserTests > authenticateWhenCustomSecurityContextHolderStrategyThenUses() FAILED
    java.lang.AssertionError at Saml2LoginBeanDefinitionParserTests.java:228

Saml2LoginBeanDefinitionParserTests > authenticateWhenCustomAuthenticationManagerThenUses() FAILED
    java.lang.AssertionError at Saml2LoginBeanDefinitionParserTests.java:280

Issue: gh-17099

@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged label May 14, 2025
@ngocnhan-tran1996
Add shouldInflate property
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e6186a1 
Signed-off-by: Tran Ngoc Nhan <[email protected]>
jzheaux
jzheaux requested changes May 15, 2025
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Thanks, @ngocnhan-tran1996! I've left some feedback inline.

...g/springframework/security/saml2/provider/service/web/Saml2AuthenticationTokenConverter.java
@@ -43,6 +43,8 @@ public final class Saml2AuthenticationTokenConverter implements AuthenticationCo

private Saml2AuthenticationRequestRepository<AbstractSaml2AuthenticationRequest> authenticationRequestRepository;

private Boolean shouldInflate;
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Please use boolean and give it an initial value of true. We typically reserve null in Boolean for "no opinion".

...g/springframework/security/saml2/provider/service/web/Saml2AuthenticationTokenConverter.java
@@ -86,16 +88,26 @@ public void setAuthenticationRequestRepository(
this.authenticationRequestRepository = authenticationRequestRepository;
}

/**
* Use the given {@code shouldInflate} to inflate request.
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Please indicate the default value in this JavaDoc

...g/springframework/security/saml2/provider/service/web/Saml2AuthenticationTokenConverter.java
private String decode(HttpServletRequest request) {
// prevent to break passivity in Saml2LoginBeanDefinitionParserTests
if (this.shouldInflate == null) {
this.shouldInflate = HttpMethod.GET.matches(request.getMethod());
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This is not thread-safe since multiple requests will use the same instance of this class. Please approach this in a way that does not involve updating a member variable.

...ingframework/security/saml2/provider/service/web/Saml2AuthenticationTokenConverterTests.java
@@ -61,6 +61,7 @@ public class Saml2AuthenticationTokenConverterTests {
public void convertWhenSamlResponseThenToken() {
Saml2AuthenticationTokenConverter converter = new Saml2AuthenticationTokenConverter(
this.relyingPartyRegistrationResolver);
converter.setShouldInflateResponse(false);
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Please don't alter any unit tests. In this way, we can have high confidence that the change is a passive one.

That said, I believe adding a test would be a good idea. I think we should test when shouldInflate is false and the request is a GET.

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@ngocnhan-tran1996 ngocnhan-tran1996 May 15, 2025 •
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Please don't alter any unit tests.

This is unclear to me. I've made changes on my local machine, and some tests will fail. We should either set the value to false to keep it passive, or update the expected results in the tests. Which option should we choose?

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