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indigo-iam / iam

INDIGO Identity and Access Management Service
https://indigo-iam.github.io/
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IAM fails in decrypting assertions issued by Shibboleth IDP v. 4 #377

Open andreaceccanti opened 3 years ago

andreaceccanti commented 3 years ago 
2021-03-02 19:31:37.543  INFO 89038 --- [nio-8080-exec-2] i.a.ExternalAuthenticationFailureHandler : External authentication failure: Response doesn't have any valid assertion which would pass subject validation

org.springframework.security.authentication.AuthenticationServiceException: Error validating SAML message

A (quite unacceptable) workaround is to request the use of unencrypted assertions on the IdP side.

andreaceccanti commented 3 years ago

This is caused by the move to AES-GCM encryption (see here) which is backward incompatible.

Another workaround, as suggested in the above wiki page, is to revert shib idp configuration to AES-CBC, either globally or per endpoint.

jouvin commented 1 year ago

I think the priority of this issue should be raised. I had the problem with a couple of IdPs already who moved to v4 and upgraded to the AES-GCM encryption (which is desirable I think from the security point of view). It would be good to avoid having IAM not able to interact with some IdPs because they don't accept to downgrade the encryption, a small but non-zero risk IMO. I don't have any clue about how complex a change it is but we need a solution at some point...