mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-09 07:15:32 +00:00
132 lines
3.7 KiB
Go
132 lines
3.7 KiB
Go
|
// An example SFTP server implementation using the golang SSH package.
|
||
|
// Serves the whole filesystem visible to the user, and has a hard-coded username and password,
|
||
|
// so not for real use!
|
||
|
package main
|
||
|
|
||
|
import (
|
||
|
"flag"
|
||
|
"fmt"
|
||
|
"io"
|
||
|
"io/ioutil"
|
||
|
"log"
|
||
|
"net"
|
||
|
"os"
|
||
|
|
||
|
"github.com/pkg/sftp"
|
||
|
"golang.org/x/crypto/ssh"
|
||
|
)
|
||
|
|
||
|
// Based on example server code from golang.org/x/crypto/ssh and server_standalone
|
||
|
func main() {
|
||
|
|
||
|
var (
|
||
|
readOnly bool
|
||
|
debugStderr bool
|
||
|
)
|
||
|
|
||
|
flag.BoolVar(&readOnly, "R", false, "read-only server")
|
||
|
flag.BoolVar(&debugStderr, "e", false, "debug to stderr")
|
||
|
flag.Parse()
|
||
|
|
||
|
debugStream := ioutil.Discard
|
||
|
if debugStderr {
|
||
|
debugStream = os.Stderr
|
||
|
}
|
||
|
|
||
|
// An SSH server is represented by a ServerConfig, which holds
|
||
|
// certificate details and handles authentication of ServerConns.
|
||
|
config := &ssh.ServerConfig{
|
||
|
PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
|
||
|
// Should use constant-time compare (or better, salt+hash) in
|
||
|
// a production setting.
|
||
|
fmt.Fprintf(debugStream, "Login: %s\n", c.User())
|
||
|
if c.User() == "testuser" && string(pass) == "tiger" {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return nil, fmt.Errorf("password rejected for %q", c.User())
|
||
|
},
|
||
|
}
|
||
|
|
||
|
privateBytes, err := ioutil.ReadFile("id_rsa")
|
||
|
if err != nil {
|
||
|
log.Fatal("Failed to load private key", err)
|
||
|
}
|
||
|
|
||
|
private, err := ssh.ParsePrivateKey(privateBytes)
|
||
|
if err != nil {
|
||
|
log.Fatal("Failed to parse private key", err)
|
||
|
}
|
||
|
|
||
|
config.AddHostKey(private)
|
||
|
|
||
|
// Once a ServerConfig has been configured, connections can be
|
||
|
// accepted.
|
||
|
listener, err := net.Listen("tcp", "0.0.0.0:2022")
|
||
|
if err != nil {
|
||
|
log.Fatal("failed to listen for connection", err)
|
||
|
}
|
||
|
fmt.Printf("Listening on %v\n", listener.Addr())
|
||
|
|
||
|
nConn, err := listener.Accept()
|
||
|
if err != nil {
|
||
|
log.Fatal("failed to accept incoming connection", err)
|
||
|
}
|
||
|
|
||
|
// Before use, a handshake must be performed on the incoming net.Conn.
|
||
|
sconn, chans, reqs, err := ssh.NewServerConn(nConn, config)
|
||
|
if err != nil {
|
||
|
log.Fatal("failed to handshake", err)
|
||
|
}
|
||
|
log.Println("login detected:", sconn.User())
|
||
|
fmt.Fprintf(debugStream, "SSH server established\n")
|
||
|
|
||
|
// The incoming Request channel must be serviced.
|
||
|
go ssh.DiscardRequests(reqs)
|
||
|
|
||
|
// Service the incoming Channel channel.
|
||
|
for newChannel := range chans {
|
||
|
// Channels have a type, depending on the application level
|
||
|
// protocol intended. In the case of an SFTP session, this is "subsystem"
|
||
|
// with a payload string of "<length=4>sftp"
|
||
|
fmt.Fprintf(debugStream, "Incoming channel: %s\n", newChannel.ChannelType())
|
||
|
if newChannel.ChannelType() != "session" {
|
||
|
newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
|
||
|
fmt.Fprintf(debugStream, "Unknown channel type: %s\n", newChannel.ChannelType())
|
||
|
continue
|
||
|
}
|
||
|
channel, requests, err := newChannel.Accept()
|
||
|
if err != nil {
|
||
|
log.Fatal("could not accept channel.", err)
|
||
|
}
|
||
|
fmt.Fprintf(debugStream, "Channel accepted\n")
|
||
|
|
||
|
// Sessions have out-of-band requests such as "shell",
|
||
|
// "pty-req" and "env". Here we handle only the
|
||
|
// "subsystem" request.
|
||
|
go func(in <-chan *ssh.Request) {
|
||
|
for req := range in {
|
||
|
fmt.Fprintf(debugStream, "Request: %v\n", req.Type)
|
||
|
ok := false
|
||
|
switch req.Type {
|
||
|
case "subsystem":
|
||
|
fmt.Fprintf(debugStream, "Subsystem: %s\n", req.Payload[4:])
|
||
|
if string(req.Payload[4:]) == "sftp" {
|
||
|
ok = true
|
||
|
}
|
||
|
}
|
||
|
fmt.Fprintf(debugStream, " - accepted: %v\n", ok)
|
||
|
req.Reply(ok, nil)
|
||
|
}
|
||
|
}(requests)
|
||
|
|
||
|
root := sftp.InMemHandler()
|
||
|
server := sftp.NewRequestServer(channel, root)
|
||
|
if err := server.Serve(); err == io.EOF {
|
||
|
server.Close()
|
||
|
log.Print("sftp client exited session.")
|
||
|
} else if err != nil {
|
||
|
log.Fatal("sftp server completed with error:", err)
|
||
|
}
|
||
|
}
|
||
|
}
|