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session.go
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session.go
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package session
import (
"net/http"
"reflect"
"sync"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitlab-runner/helpers"
"gitlab.com/gitlab-org/gitlab-runner/session/proxy"
"gitlab.com/gitlab-org/gitlab-runner/session/terminal"
)
type connectionInUseError struct{}
func (connectionInUseError) Error() string {
return "Connection already in use"
}
type Session struct {
Endpoint string
Token string
mux *mux.Router
interactiveTerminal terminal.InteractiveTerminal
terminalConn terminal.Conn
proxyPool proxy.Pool
// Signal when client disconnects from terminal.
DisconnectCh chan error
// Signal when terminal session timeout.
TimeoutCh chan error
log *logrus.Entry
sync.Mutex
}
func NewSession(logger *logrus.Entry) (*Session, error) {
endpoint, token, err := generateEndpoint()
if err != nil {
return nil, err
}
if logger == nil {
logger = logrus.NewEntry(logrus.StandardLogger())
}
logger = logger.WithField("uri", endpoint)
sess := &Session{
Endpoint: endpoint,
Token: token,
DisconnectCh: make(chan error),
TimeoutCh: make(chan error),
log: logger,
}
sess.setMux()
return sess, nil
}
func generateEndpoint() (string, string, error) {
sessionUUID, err := helpers.GenerateRandomUUID(32)
if err != nil {
return "", "", err
}
token, err := generateToken()
if err != nil {
return "", "", err
}
return "/session/" + sessionUUID, token, nil
}
func generateToken() (string, error) {
token, err := helpers.GenerateRandomUUID(32)
if err != nil {
return "", err
}
return token, nil
}
func (s *Session) withAuthorization(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger := s.log.WithField("uri", r.RequestURI)
logger.Debug("Endpoint session request")
if s.Token != r.Header.Get("Authorization") {
logger.Error("Authorization header is not valid")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
next.ServeHTTP(w, r)
})
}
func (s *Session) setMux() {
s.Lock()
defer s.Unlock()
s.mux = mux.NewRouter()
s.mux.Handle(s.Endpoint+"/proxy/{resource}/{port}/{requestedUri:.*}", s.withAuthorization(http.HandlerFunc(s.proxyHandler)))
s.mux.Handle(s.Endpoint+"/exec", s.withAuthorization(http.HandlerFunc(s.execHandler)))
}
func (s *Session) proxyHandler(w http.ResponseWriter, r *http.Request) {
logger := s.log.WithField("uri", r.RequestURI)
logger.Debug("Proxy session request")
params := mux.Vars(r)
serviceName := params["resource"]
serviceProxy := s.proxyPool[serviceName]
if serviceProxy == nil {
logger.Warn("Proxy not found")
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
if serviceProxy.ConnectionHandler == nil {
logger.Warn("Proxy connection handler is not defined")
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
serviceProxy.ConnectionHandler.ProxyRequest(w, r, params["requestedUri"], params["port"], serviceProxy.Settings)
}
func (s *Session) execHandler(w http.ResponseWriter, r *http.Request) {
logger := s.log.WithField("uri", r.RequestURI)
logger.Debug("Exec terminal session request")
if !s.terminalAvailable() {
logger.Error("Interactive terminal not set")
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
if !websocket.IsWebSocketUpgrade(r) {
logger.Error("Request is not a web socket connection")
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
terminalConn, err := s.newTerminalConn()
if _, ok := err.(connectionInUseError); ok {
logger.Warn("Terminal already connected, revoking connection")
http.Error(w, http.StatusText(http.StatusLocked), http.StatusLocked)
return
}
if err != nil {
logger.WithError(err).Error("Failed to connect to terminal")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
defer s.closeTerminalConn(terminalConn)
logger.Debugln("Starting terminal session")
terminalConn.Start(w, r, s.TimeoutCh, s.DisconnectCh)
}
func (s *Session) terminalAvailable() bool {
s.Lock()
defer s.Unlock()
return s.interactiveTerminal != nil
}
func (s *Session) newTerminalConn() (terminal.Conn, error) {
s.Lock()
defer s.Unlock()
if s.terminalConn != nil {
return nil, connectionInUseError{}
}
conn, err := s.interactiveTerminal.Connect()
if err != nil {
return nil, err
}
s.terminalConn = conn
return conn, nil
}
func (s *Session) closeTerminalConn(conn terminal.Conn) {
s.Lock()
defer s.Unlock()
err := conn.Close()
if err != nil {
s.log.WithError(err).Warn("Failed to close terminal connection")
}
if reflect.ValueOf(s.terminalConn) == reflect.ValueOf(conn) {
s.log.Warningln("Closed active terminal connection")
s.terminalConn = nil
}
}
func (s *Session) SetInteractiveTerminal(interactiveTerminal terminal.InteractiveTerminal) {
s.Lock()
defer s.Unlock()
s.interactiveTerminal = interactiveTerminal
}
func (s *Session) SetProxyPool(pooler proxy.Pooler) {
s.Lock()
defer s.Unlock()
s.proxyPool = pooler.Pool()
}
func (s *Session) Mux() *mux.Router {
return s.mux
}
func (s *Session) Connected() bool {
s.Lock()
defer s.Unlock()
return s.terminalConn != nil
}
func (s *Session) Kill() error {
s.Lock()
defer s.Unlock()
if s.terminalConn == nil {
return nil
}
err := s.terminalConn.Close()
s.terminalConn = nil
return err
}