I have a project, call it Project A
. I have created a subscription to a Pub/Sub topic owned by Project B
. This subscription is configured to deliver push notifications to my endpoint. I would like to create some firewall rules to restrict access to the instances handling the pub/sub notifications so that only Google can access the instances when delivering the notifications. I don't want any other inbound traffic to the hosts. How can I do this?
Cross project push pub sub and firewall rules
1.7k Views Asked by Max At
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I don't think that's possible. From https://cloud.google.com/pubsub/docs/subscriber#pubsub-pull-messages-csharp
To answer the larger question which may be relevant to you:
How do I prevent attackers from posting bogus messages to my endpoint?
The answer to that question is to share a secret between Project A and Project B, and include an artifact of that secret in the message attributes. Sign the message with a private key and include the signature in the attributes. Then, the endpoint receives the message and verifies the signature against a public key.