feat: Adding support for HA Proxy's PROXY protocol#259
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In 2011 the people working on HA Proxy developed what would be known as the PROXY protocol. This solved the problem of how upstream load balancers and proxies could pass information about the original client's IP address and port to the backend server.
In order to take advantage of the PROXY protocol, the load balancer must send the PROXY header and the backend server needs to be able to read the header. The protocol is supported by a wide variety of load balancers including:
This pull request adds support for the PROXY protocol to the ssh server via a new option called
EnableProxyProtocol. An example has been included in the_examplesdirectory.This is accomplished through the https://github.com/pires/go-proxyproto library. It replaces the information returned by the
ssh.Sessionobject'sRemoteAdd()function with the requestor's original IP address and port and not the load balancer's load balancer and port which is what would be displayed without this protocol.