Ingress-nginx: Enable use-forwarded-headers on subset of ingresses or from whitelisted hosts

[praseodym]

We're running ingress-nginx with a reverse proxy in front of it, so we enabled the use-forwarded-headers option to ensure that X-Forwarded-* headers from the reverse proxy are passed on to our Kubernetes pods.

Now, we're considering making some applications (each with their own Kubernetes ingress object defined) directly available without the additional reverse proxy. However, this would make ingress-nginx accept X-Forwarded-* from the public internet, which is clearly a bad idea.

The solution would be to enable the use-forwarded-headers option only for a subset of ingresses, or only when traffic arrives from certain trusted hosts (i.e. only our own reverse proxy). Neither is possible at this time, so this is a feature request for one of these solutions.

A workaround exists by deploying two instances of ingress-nginx, but this is quite a hassle.

[alexkursell]

Is the other reverse proxy running inside the same kubernetes cluster? If so, maybe set the whitelist-source-range annotation on the ingresses you don't want to be publicly accessible to 10.0.0.0/8. That way only in-cluster addresses can make requests to it and all public requests would have to go through the reverse proxy.

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[praseodym]

/remove-lifecycle rotten

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@fejta-bot: Closing this issue.

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[mauritsvdvijgh]

Running into this issue at the moment, a solution would be appreciated.

[mauritsvdvijgh]

/reopen

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[praseodym]

/reopen

[k8s-ci-robot]

@praseodym: Reopened this issue.

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/reopen

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[The-Loeki]

Related PR's/issues that apparently went nowhere most unfortunately:

• #4326
• #4343

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@fejta-bot: Closing this issue.

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[mauritsvdvijgh]

please /reopen

[praseodym]

/reopen

[k8s-ci-robot]

@praseodym: Reopened this issue.

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/reopen

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@fejta-bot: Closing this issue.

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