Ability to add custom headers for Cloudflare Zero Trust

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@hslatman ya está trabajando en esto.

Desde el 20/8/2024.

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Descripción

enhancement

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Issue details

This request is similar to issue 1026. We are interested in being able to generate certificates on clients through a Cloudflare Zero Trust tunnel. According to the cloudflare documentation here, we would need to be able to set the 'cf-access-token' header with a value that is generated with the cloudflared command line utility. This would allow us to perform authentication and authorization prior to reaching our stepca instance.

Why is this needed?

Such a tunnel increases the security of our deployment by providing an additional layer of authentication and authorization. If there were a chance to pass user data into step, it would also potentially provide the ability to template certificates to prevent users from inadvertently or maliciously issuing a certificate with incorrect parameters such an common name or email address.

We are currently building a CA that will issue certificates to Yubikey holders and are using a webhook to map Yubikey serial numbers to users. This could remove the need for the webhook if we could verify that a user had permissions to access the CA via cloudflare rather than needed to provide access over VPN or a physical connection to our network. It also may reduce the administrative burden of maintaining the webhook and the user-to-Yubikey mappings.

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