Merge branch '6.1.x' into 6.2.x

Closes gh-14958

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml4AuthenticationProvider.java

@@ -57,6 +57,7 @@ import org.opensaml.saml.saml2.assertion.SubjectConfirmationValidator;
 import org.opensaml.saml.saml2.assertion.impl.AudienceRestrictionConditionValidator;
 import org.opensaml.saml.saml2.assertion.impl.BearerSubjectConfirmationValidator;
 import org.opensaml.saml.saml2.assertion.impl.DelegationRestrictionConditionValidator;
+import org.opensaml.saml.saml2.assertion.impl.ProxyRestrictionConditionValidator;
 import org.opensaml.saml.saml2.core.Assertion;
 import org.opensaml.saml.saml2.core.Attribute;
 import org.opensaml.saml.saml2.core.AttributeStatement;
@@ -834,6 +835,7 @@ public final class OpenSaml4AuthenticationProvider implements AuthenticationProv
 					return ValidationResult.VALID;
 				}
 			});
+			conditions.add(new ProxyRestrictionConditionValidator());
 			subjects.add(new BearerSubjectConfirmationValidator() {
 				@Override
 				protected ValidationResult validateAddress(SubjectConfirmation confirmation, Assertion assertion,

saml2/saml2-service-provider/src/test/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml4AuthenticationProviderTests.java

@@ -54,6 +54,7 @@ import org.opensaml.saml.saml2.core.EncryptedID;
 import org.opensaml.saml.saml2.core.Issuer;
 import org.opensaml.saml.saml2.core.NameID;
 import org.opensaml.saml.saml2.core.OneTimeUse;
+import org.opensaml.saml.saml2.core.ProxyRestriction;
 import org.opensaml.saml.saml2.core.Response;
 import org.opensaml.saml.saml2.core.Status;
 import org.opensaml.saml.saml2.core.StatusCode;
@@ -63,6 +64,7 @@ import org.opensaml.saml.saml2.core.impl.AttributeBuilder;
 import org.opensaml.saml.saml2.core.impl.EncryptedAssertionBuilder;
 import org.opensaml.saml.saml2.core.impl.EncryptedIDBuilder;
 import org.opensaml.saml.saml2.core.impl.NameIDBuilder;
+import org.opensaml.saml.saml2.core.impl.ProxyRestrictionBuilder;
 import org.opensaml.saml.saml2.core.impl.StatusBuilder;
 import org.opensaml.saml.saml2.core.impl.StatusCodeBuilder;
 import org.opensaml.xmlsec.encryption.impl.EncryptedDataBuilder;
@@ -832,6 +834,19 @@ public class OpenSaml4AuthenticationProviderTests {
 			.withMessageContaining("did not match any valid issuers");
 	}
 
+	// gh-14931
+	@Test
+	public void authenticateWhenAssertionHasProxyRestrictionThenParses() {
+		OpenSaml4AuthenticationProvider provider = new OpenSaml4AuthenticationProvider();
+		Response response = response();
+		Assertion assertion = assertion();
+		ProxyRestriction condition = new ProxyRestrictionBuilder().buildObject();
+		assertion.getConditions().getConditions().add(condition);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		provider.authenticate(token);
+	}
+
 	private <T extends XMLObject> T build(QName qName) {
 		return (T) XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(qName).buildObject(qName);
 	}