docs: Add authenticated-repos.md

Document options for accessing repositories that require authentication.
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Colin Walters 2023-09-27 14:02:25 -04:00
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# Handling access to authenticated remote repositories
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1. TOC
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There is no default concept of an "ostree server"; ostree expects to talk to a generic webserver, so any tool and technique applicable for generic HTTP can also apply to fetching content via OSTree's builtin HTTP client.
## Using mutual TLS
The `tls-client-cert-path` and `tls-client-key-path` expose the underlying HTTP code for [mutual TLS](https://en.wikipedia.org/wiki/Mutual_authentication).
Each device can be provisioned with a secret key which grants it access to the webserver.
## Using basic authentication
The client supports HTTP `basic` authentication, but this has well-known management drawbacks.
## Using cookies
Since [this pull request](https://github.com/ostreedev/ostree/pull/531) ostree supports adding cookies to a remote configuration. This can be used with e.g. [Amazon CloudFront](https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html).