// Closes a previously opened SSL connection.
func (self *SSHTunnelEstablisher) tearDownSSHTunnel(config *util.Config) {
if self.ciHostURL == nil {
return
}
self.tunnelConnected.Set(false)
self.resetAliveStateMonitoring(config)
config.CIHostURI = self.ciHostURL.String()
delete(util.JnlpArgs, "-url")
delete(util.JnlpArgs, "-tunnel")
if self.closables != nil && len(self.closables) > 0 {
for i := len(self.closables) - 1; i >= 0; i-- {
self.closables[i].Close()
}
self.closables = self.closables[0:0]
}
}
// Opens a new SSH connection, local server ports (JNLP, HTTP) and forwards it to the corresponding ports on Jenkins.
func (self *SSHTunnelEstablisher) setupSSHTunnel(config *util.Config) {
if self.ciHostURL == nil {
return
}
if !config.PassCIAuth && config.SecretKey != "" {
util.GOut("ssh-tunnel", "WARN: Secret key is not supported in combination with SSH tunnel. Implicitly setting %v to %v", "client>passAuth", "true")
config.PassCIAuth = true
}
// Ensure no other SSL connections are still open.
self.tearDownSSHTunnel(config)
// Configuring the SSH client
clientConfig := &ssh.ClientConfig{
User: config.CITunnelSSHUsername,
Auth: []ssh.AuthMethod{
ssh.Password(config.CITunnelSSHPassword),
},
HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
expected, actual := config.CITunnelSSHFingerprint, self.formatHostFingerprint(key)
if actual != expected && expected != "-" {
if expected == "" {
return fmt.Errorf("The host fingerprint of '%v' is '%v'. Please add this to the configuration in order to connect.", hostname, actual)
} else {
return fmt.Errorf("The host fingerprint of '%v' is '%v' while '%v' was expected. Connection aborted.", hostname, actual, expected)
}
}
return nil
},
}
// Connecting to the SSH host
if config.CITunnelSSHPort == 0 {
config.CITunnelSSHPort = 22
}
sshAddress := fmt.Sprintf("%v:%v", config.CITunnelSSHAddress, config.CITunnelSSHPort)
sshClient, err := ssh.Dial("tcp", sshAddress, clientConfig)
if err == nil {
self.closables = append(self.closables, sshClient)
util.GOut("ssh-tunnel", "Successfully connected with '%v'.", sshAddress)
} else {
util.GOut("ssh-tunnel", "ERROR: Failed connecting with %v. Cause: %v", sshAddress, err)
return
}
// Fetching target ports
jnlpTargetAddress, err := self.formatJNLPHostAndPort(config)
if err != nil {
util.GOut("ssh-tunnel", "ERROR: Failed fetching JNLP port from '%v'. Cause: %v.", config.CIHostURI, err)
return
}
httpTargetAddress := self.formatHttpHostAndPort()
// Creating a local server listeners to use for port forwarding.
httpListener, err1 := self.newLocalServerListener()
jnlpListener, err2 := self.newLocalServerListener()
if err1 != nil || err2 != nil {
self.tearDownSSHTunnel(config)
return
}
// Forward local connections to the HTTP(S)/JNLP ports.
go self.forwardLocalConnectionsTo(config, sshClient, httpListener, httpTargetAddress)
go self.forwardLocalConnectionsTo(config, sshClient, jnlpListener, jnlpTargetAddress)
// Apply the tunnel configuration
localCiURL, _ := url.Parse(self.ciHostURL.String())
localCiURL.Host = httpListener.Addr().String()
config.CIHostURI = localCiURL.String()
util.JnlpArgs["-url"] = localCiURL.String()
util.JnlpArgs["-tunnel"] = jnlpListener.Addr().String()
// Mark tunnel as connected when we passed this line.
self.tunnelConnected.Set(true)
}