Benchmark to block wildcards in Ingress hostnames
mac-chaffee opened this issue · comments
Users can put wildcards (*) in their Ingresses, but I think this can lead to security issues in a multi-tenant environment: https://kubernetes.io/docs/concepts/services-networking/ingress/#hostname-wildcards
Wildcards in hostnames mean that one tenant could create an ingress for "myservice.example.com" and another tenant could create an ingress for "*.example.com" or just "*" and wait. As long as the "myservice.example.com" ingress exists, there's no issue. But if that Ingress is ever removed, even for a second, the traffic will be sent to the other tenant's wildcard Ingress instead, where they can intercept credentials/secrets/etc.
Additionally, if users leave the "host" field blank in their Ingress, it will automatically be converted into the wildcard "*", which means this situation may even happen by accident.
Gatekeeper has an example policy which enforces unique Ingress hosts amongst tenants, but it doesn't handle wildcards: https://github.com/open-policy-agent/gatekeeper-library/blob/master/library/general/uniqueingresshost/template.yaml Maybe adding a benchmark here can help raise awareness of this risk.
Additional reference: https://youtu.be/Bxnu3llBN20?t=538
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I believe this is still a very important protection for tenants, but just haven't had the time to implement it
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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".
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