/*

Package ssh wraps the crypto/ssh package with a higher-level API for building
SSH servers. The goal of the API was to make it as simple as using net/http, so
the API is very similar.

You should be able to build any SSH server using only this package, which wraps
relevant types and some functions from crypto/ssh. However, you still need to
use crypto/ssh for building SSH clients.

ListenAndServe starts an SSH server with a given address, handler, and options. The
handler is usually nil, which means to use DefaultHandler. Handle sets DefaultHandler:

  ssh.Handle(func(s ssh.Session) {
    io.WriteString(s, "Hello world\n")
  })

  log.Fatal(ssh.ListenAndServe(":2222", nil))

If you don't specify a host key, it will generate one every time. This is convenient
except you'll have to deal with clients being confused that the host key is different.
It's a better idea to generate or point to an existing key on your system:

  log.Fatal(ssh.ListenAndServe(":2222", nil, ssh.HostKeyFile("/Users/progrium/.ssh/id_rsa")))

Although all options have functional option helpers, another way to control the
server's behavior is by creating a custom Server:

  s := &ssh.Server{
    Addr:             ":2222",
    Handler:          sessionHandler,
    PublicKeyHandler: authHandler,
  }
  s.AddHostKey(hostKeySigner)

  log.Fatal(s.ListenAndServe())

*/
package ssh