How Can Go Applications Safely Drop Privileges After Binding to Port 80?

Golang Dropping Privileges (v1.7)

In a bid to create a custom webserver, you've encountered the challenge of dropping privileges while binding to port 80, which requires root access. While alternative solutions may involve rerouting port 80, this poses security risks. How can you navigate this issue effectively?

According to the provided response, Go offers a comprehensive solution by allowing you to open the port, detect the UID, and if it's 0, search for the desired user and retrieve the UID. Subsequently, you can utilize glibc calls to set the process's UID and GID.

It is crucial to emphasize the importance of calling the setuid code immediately after binding the port. Unlike the http.ListenAndServe(TLS)? helper function, you will need to establish your net.Listener independently and invoke setuid post port binding but prior to initializing http.Serve.

The provided code snippet demonstrates this approach effectively. It includes SSL implementation and allows you to run in "development" mode with a non-root UID on a high port without encountering complications. Remember to personalize the configuration file by setting address, port, user, group, and TLS file names.

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