WARN message with AuthnRequest not signed but metadata configured to not require signing

[Lipscomb, Gary]

### Operating Environment Information
operating_system: Linux
operating_system_version: 4.18.0-553.46.1.el8_10.x86_64
operating_system_architecture: amd64
jdk_version: 17.0.14

### Identity Provider Information
idp_version: 5.1.4

I'm getting this WARN message

2025-04-29 12:46:35,043 - 10.9.246.182 - WARN [org.opensaml.saml.saml2.binding.decoding.impl.HTTPRedirectDeflateDecoder:219] - Signature algorithm could not be extracted from request, cannot build simple signature content

<Snip from metadata>

<EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    xmlns:mdattr="urn:oasis:names:tc:SAML:metadata:attribute"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    entityID="REDACTED">

    <Extensions>
      <mdattr:EntityAttributes>
          <saml:Attribute Name="http://shibboleth.net/ns/profiles/saml2/sso/browser/signRequests"
              NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri">
              <saml:AttributeValue xsi:type="xsd:boolean">false</saml:AttributeValue>
          </saml:Attribute>
      </mdattr:EntityAttributes>
      <mdattr:EntityAttributes>
          <saml:Attribute Name="http://shibboleth.net/ns/profiles/saml2/sso/browser/ignoreRequestSignatures"
              NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri">
              <saml:AttributeValue xsi:type="xsd:boolean">false</saml:AttributeValue>
          </saml:Attribute>
      </mdattr:EntityAttributes>
    </Extensions>

    <SPSSODescriptor WantAssertionsSigned="true" AuthnRequestsSigned="false"  protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol urn:oasis:names:tc:SAML:1.1:protocol">

</Snip>

Have I missed a setting somewhere?

regards
Gary




Gary Lipscomb

Technical Officer, Systems

IT Infrastructure & Security | Division of Information Technology

Charles Sturt University, Bathurst, NSW 2795


[Charles Sturt]<https://www.csu.edu.au>

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