Comment 6 for bug 1833299

Hi Christian,

Thanks, please do, no last minute changes from my side.

On Thu., Jul. 11, 2019, 06:27 Christian Ehrhardt , <
<email address hidden>> wrote:

> Hi,
> I reviewed the MPs and they are (aside some potential polishing of the
> changelog) ok to me.
> You'll need an SRU template for these to be kicked off later on.
> Thanks for driving the change upstream, that will help to one day be able
> to drop the Delta.
>
> IMHO Eoan one could sponsor right away, please let me know if you want
> me to do so now or if there are any last minute changes.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1833299
>
> Title:
> lasso includes "Destination" attribute in SAML AuthnRequest populated
> with SP AssertionConsumerServiceURL when ECP workflow is used which
> leads to IdP-side errors
>
> Status in lasso package in Ubuntu:
> Confirmed
>
> Bug description:
> See comments on the bug:
> https://bugs.launchpad.net/charm-keystone-saml-mellon/+bug/1833134
>
> Lasso is used by libapache2-mod-auth-mellon to create SAML messages.
> When ECP profile (http://docs.oasis-open.org/security/saml/Post2.0
> /saml-ecp/v2.0/cs01/saml-ecp-v2.0-cs01.pdf) is used it populates an
> AuthnRequest with the "Destination" attribute as follows:
>
> <samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
> xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
> ID="_798F26F73776E684A463559CDB77D080" Version="2.0"
> IssueInstant="2019-06-18T16:54:25Z" Destination="
> https://keystone.maas:5000/v3/OS-FEDERATION/identity_providers/samltestid/protocols/saml2/auth/mellon/paosResponse"
> Consent="urn:oasis:names:tc:SAML:2.0:consent:current-implicit" SignType="0"
> SignMethod="0" ForceAuthn="false" IsPassive="false"
> AssertionConsumerServiceURL="
> https://keystone.maas:5000/v3/OS-FEDERATION/identity_providers/samltestid/protocols/saml2/auth/mellon/paosResponse
> ">
> <saml:Issuer>
> https://keystone.maas:5000/v3/OS-FEDERATION/identity_providers/samltestid/protocols/saml2/auth
> </saml:Issuer>
> <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
>
> This triggers the Destination attribute validation logic relevant for
> "HTTP Redirect" and "HTTP POST" bindings only (per the spec, sections
> 3.4.5.2 and 3.5.5.2), not SOAP or PAOS bindings (sections before 3.4).
> http://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
>
> For example, Shibboleth IdP (samltest.id) errors out as follows as the
> Destination attribute was populated with an SP URL:
>
> 2019-06-18 16:54:25,435 - ERROR
>
> [org.opensaml.saml.common.binding.security.impl.ReceivedEndpointSecurityHandler:?]
> - Message Handler: SAML message intended destination endpoint
> 'https://keystone.maas:5000/v3/OS-
>
> FEDERATION/identity_providers/samltestid/protocols/saml2/auth/mellon/paosResponse'
> did not match the recipient endpoint
> 'https://samltest.id/idp/profile/SAML2/SOAP/ECP'
>
> For ECP it makes sense to avoid inclusion of the "Destination"
> attribute to AuthnRequest (see https://bugs.launchpad.net/charm-
> keystone-saml-mellon/+bug/1833134/comments/3).
>
> The attached patch is merely an illustration that not using Destination
> with ECP results in a successful authentication:
>
> https://bugs.launchpad.net/charm-keystone-saml-mellon/+bug/1833134/comments/2
>
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>