// KeyboardInteractiveCallback is called after PublicKeyCallback
func (s *Server) KeyboardInteractiveCallback(conn ssh.ConnMetadata, challenge ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
username := conn.User()
clientID := conn.RemoteAddr().String()
logrus.Debugf("KeyboardInteractiveCallback: %q %q", username, challenge)
config := s.ClientConfigs[clientID]
if config == nil {
s.ClientConfigs[clientID] = &ClientConfig{
RemoteUser: username,
ImageName: username,
Keys: []string{},
Env: make(Environment, 0),
}
}
config = s.ClientConfigs[clientID]
if len(config.Keys) == 0 {
logrus.Warnf("No user keys, continuing with password authentication")
return nil, s.CheckConfig(config)
}
if s.PublicKeyAuthScript != "" {
logrus.Debugf("%d keys received, trying to authenticate using hook script", len(config.Keys))
script, err := expandUser(s.PublicKeyAuthScript)
if err != nil {
logrus.Warnf("Failed to expandUser: %v", err)
return nil, err
}
args := append([]string{username}, config.Keys...)
cmd := exec.Command(script, args...)
// FIXME: redirect stderr to logrus
cmd.Stderr = os.Stderr
output, err := cmd.Output()
if err != nil {
logrus.Warnf("Failed to execute publickey-auth-script: %v", err)
return nil, err
}
err = json.Unmarshal(output, &config)
if err != nil {
logrus.Warnf("Failed to unmarshal json %q: %v", string(output), err)
return nil, err
}
} else {
logrus.Debugf("%d keys received, but no hook script, continuing", len(config.Keys))
}
return nil, s.CheckConfig(config)
}
// PasswordCallback is called when the user tries to authenticate using a password
func (s *Server) PasswordCallback(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
username := conn.User()
clientID := conn.RemoteAddr().String()
logrus.Debugf("PasswordCallback: %q %q", username, password)
config := s.ClientConfigs[clientID]
if config == nil {
s.ClientConfigs[clientID] = &ClientConfig{
//Allowed: true,
RemoteUser: username,
ImageName: username,
Keys: []string{},
Env: make(Environment, 0),
}
}
config = s.ClientConfigs[clientID]
if s.PasswordAuthScript != "" {
script, err := expandUser(s.PasswordAuthScript)
if err != nil {
logrus.Warnf("Failed to expandUser: %v", err)
return nil, err
}
cmd := exec.Command(script, username, string(password))
// FIXME: redirect stderr to logrus
cmd.Stderr = os.Stderr
output, err := cmd.Output()
if err != nil {
logrus.Warnf("Failed to execute password-auth-script: %v", err)
return nil, err
}
err = json.Unmarshal(output, &config)
if err != nil {
logrus.Warnf("Failed to unmarshal json %q: %v", string(output), err)
return nil, err
}
}
return nil, s.CheckConfig(config)
}
// PublicKeyCallback is called when the user tries to authenticate using an SSH public key
func (s *Server) PublicKeyCallback(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
username := conn.User()
clientID := conn.RemoteAddr().String()
keyText := strings.TrimSpace(string(ssh.MarshalAuthorizedKey(key)))
logrus.Debugf("PublicKeyCallback: %q %q", username, keyText)
// sessionID := conn.SessionID()
config := s.ClientConfigs[clientID]
if config == nil {
s.ClientConfigs[clientID] = &ClientConfig{
RemoteUser: username,
ImageName: username,
Keys: []string{},
Env: make(Environment, 0),
}
}
config = s.ClientConfigs[clientID]
config.Keys = append(config.Keys, keyText)
return nil, s.CheckConfig(config)
}