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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package ssh implements an SSH server.
SSH is a transport security protocol, an authentication protocol and a
family of application protocols. The most typical application level
protocol is a remote shell and this is specifically implemented. However,
the multiplexed nature of SSH is exposed to users that wish to support
others.
An SSH server is represented by a Server, which manages a number of
ServerConnections and handles authentication.
var s Server
s.PubKeyCallback = pubKeyAuth
s.PasswordCallback = passwordAuth
pemBytes, err := ioutil.ReadFile("id_rsa")
if err != nil {
panic("Failed to load private key")
}
err = s.SetRSAPrivateKey(pemBytes)
if err != nil {
panic("Failed to parse private key")
}
Once a Server has been set up, connections can be attached.
var sConn ServerConnection
sConn.Server = &s
err = sConn.Handshake(conn)
if err != nil {
panic("failed to handshake")
}
An SSH connection multiplexes several channels, which must be accepted themselves:
for {
channel, err := sConn.Accept()
if err != nil {
panic("error from Accept")
}
...
}
Accept reads from the connection, demultiplexes packets to their corresponding
channels and returns when a new channel request is seen. Some goroutine must
always be calling Accept; otherwise no messages will be forwarded to the
channels.
Channels have a type, depending on the application level protocol intended. In
the case of a shell, the type is "session" and ServerShell may be used to
present a simple terminal interface.
if channel.ChannelType() != "session" {
c.Reject(UnknownChannelType, "unknown channel type")
return
}
channel.Accept()
shell := NewServerShell(channel, "> ")
go func() {
defer channel.Close()
for {
line, err := shell.ReadLine()
if err != nil {
break
}
println(line)
}
return
}()
*/
package ssh
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