// setProxyCommand sets the proxy command option.
func (c *SSHCommon) setProxyCommand(options *ssh.Options) error {
apiServerHost, _, err := net.SplitHostPort(c.apiAddr)
if err != nil {
return errors.Errorf("failed to get proxy address: %v", err)
}
juju, err := getJujuExecutable()
if err != nil {
return errors.Errorf("failed to get juju executable path: %v", err)
}
// TODO(mjs) 2016-05-09 LP #1579592 - It would be good to check the
// host key of the controller machine being used for proxying
// here. This isn't too serious as all traffic passing through the
// controller host is encrypted and the host key of the ultimate
// target host is verified but it would still be better to perform
// this extra level of checking.
options.SetProxyCommand(
juju, "ssh",
"--proxy=false",
"--no-host-key-checks",
"--pty=false",
"ubuntu@"+apiServerHost,
"-q",
"nc %h %p",
)
return nil
}
func (s *SSHGoCryptoCommandSuite) TestProxyCommand(c *gc.C) {
realNetcat, err := exec.LookPath("nc")
if err != nil {
c.Skip("skipping test, couldn't find netcat: %v")
return
}
netcat := filepath.Join(c.MkDir(), "nc")
err = ioutil.WriteFile(netcat, []byte("#!/bin/sh\necho $0 \"$@\" > $0.args && exec "+realNetcat+" \"$@\""), 0755)
c.Assert(err, jc.ErrorIsNil)
private, _, err := ssh.GenerateKey("test-server")
c.Assert(err, jc.ErrorIsNil)
key, err := cryptossh.ParsePrivateKey([]byte(private))
client, err := ssh.NewGoCryptoClient(key)
c.Assert(err, jc.ErrorIsNil)
server := newServer(c)
var opts ssh.Options
port := server.listener.Addr().(*net.TCPAddr).Port
opts.SetProxyCommand(netcat, "-q0", "%h", "%p")
opts.SetPort(port)
cmd := client.Command("127.0.0.1", testCommand, &opts)
server.cfg.PublicKeyCallback = func(_ cryptossh.ConnMetadata, pubkey cryptossh.PublicKey) (*cryptossh.Permissions, error) {
return nil, nil
}
go server.run(c)
out, err := cmd.Output()
c.Assert(err, jc.ErrorIsNil)
c.Assert(string(out), gc.Equals, "abc value\n")
// Ensure the proxy command was executed with the appropriate arguments.
data, err := ioutil.ReadFile(netcat + ".args")
c.Assert(err, jc.ErrorIsNil)
c.Assert(string(data), gc.Equals, fmt.Sprintf("%s -q0 127.0.0.1 %v\n", netcat, port))
}
// setProxyCommand sets the proxy command option.
func (c *SSHCommon) setProxyCommand(options *ssh.Options) error {
apiServerHost, _, err := net.SplitHostPort(c.apiAddr)
if err != nil {
return fmt.Errorf("failed to get proxy address: %v", err)
}
juju, err := getJujuExecutable()
if err != nil {
return fmt.Errorf("failed to get juju executable path: %v", err)
}
options.SetProxyCommand(juju, "ssh", "--proxy=false", "--pty=false", apiServerHost, "nc", "%h", "%p")
return nil
}