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