mirror of https://github.com/portainer/portainer
126 lines
4.3 KiB
Go
126 lines
4.3 KiB
Go
package websocket
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import (
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"net"
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"net/http"
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"net/http/httputil"
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"time"
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"github.com/asaskevich/govalidator"
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"github.com/gorilla/websocket"
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httperror "github.com/portainer/libhttp/error"
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"github.com/portainer/libhttp/request"
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"github.com/portainer/portainer/api"
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"github.com/portainer/portainer/api/bolt/errors"
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)
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// websocketAttach handles GET requests on /websocket/attach?id=<attachID>&endpointId=<endpointID>&nodeName=<nodeName>&token=<token>
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// If the nodeName query parameter is present, the request will be proxied to the underlying agent endpoint.
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// If the nodeName query parameter is not specified, the request will be upgraded to the websocket protocol and
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// an AttachStart operation HTTP request will be created and hijacked.
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// Authentication and access is controled via the mandatory token query parameter.
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func (handler *Handler) websocketAttach(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
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attachID, err := request.RetrieveQueryParameter(r, "id", false)
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if err != nil {
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return &httperror.HandlerError{http.StatusBadRequest, "Invalid query parameter: id", err}
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}
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if !govalidator.IsHexadecimal(attachID) {
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return &httperror.HandlerError{http.StatusBadRequest, "Invalid query parameter: id (must be hexadecimal identifier)", err}
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}
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endpointID, err := request.RetrieveNumericQueryParameter(r, "endpointId", false)
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if err != nil {
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return &httperror.HandlerError{http.StatusBadRequest, "Invalid query parameter: endpointId", err}
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}
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endpoint, err := handler.DataStore.Endpoint().Endpoint(portainer.EndpointID(endpointID))
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if err == errors.ErrObjectNotFound {
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return &httperror.HandlerError{http.StatusNotFound, "Unable to find the endpoint associated to the stack inside the database", err}
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} else if err != nil {
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return &httperror.HandlerError{http.StatusInternalServerError, "Unable to find the endpoint associated to the stack inside the database", err}
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}
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err = handler.requestBouncer.AuthorizedEndpointOperation(r, endpoint)
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if err != nil {
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return &httperror.HandlerError{http.StatusForbidden, "Permission denied to access endpoint", err}
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}
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params := &webSocketRequestParams{
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endpoint: endpoint,
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ID: attachID,
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nodeName: r.FormValue("nodeName"),
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}
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err = handler.handleAttachRequest(w, r, params)
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if err != nil {
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return &httperror.HandlerError{http.StatusInternalServerError, "An error occured during websocket attach operation", err}
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}
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return nil
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}
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func (handler *Handler) handleAttachRequest(w http.ResponseWriter, r *http.Request, params *webSocketRequestParams) error {
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r.Header.Del("Origin")
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if params.endpoint.Type == portainer.AgentOnDockerEnvironment {
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return handler.proxyAgentWebsocketRequest(w, r, params)
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} else if params.endpoint.Type == portainer.EdgeAgentOnDockerEnvironment {
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return handler.proxyEdgeAgentWebsocketRequest(w, r, params)
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}
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websocketConn, err := handler.connectionUpgrader.Upgrade(w, r, nil)
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if err != nil {
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return err
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}
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defer websocketConn.Close()
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return hijackAttachStartOperation(websocketConn, params.endpoint, params.ID)
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}
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func hijackAttachStartOperation(websocketConn *websocket.Conn, endpoint *portainer.Endpoint, attachID string) error {
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dial, err := initDial(endpoint)
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if err != nil {
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return err
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}
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// When we set up a TCP connection for hijack, there could be long periods
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// of inactivity (a long running command with no output) that in certain
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// network setups may cause ECONNTIMEOUT, leaving the client in an unknown
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// state. Setting TCP KeepAlive on the socket connection will prohibit
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// ECONNTIMEOUT unless the socket connection truly is broken
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if tcpConn, ok := dial.(*net.TCPConn); ok {
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tcpConn.SetKeepAlive(true)
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tcpConn.SetKeepAlivePeriod(30 * time.Second)
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}
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httpConn := httputil.NewClientConn(dial, nil)
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defer httpConn.Close()
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attachStartRequest, err := createAttachStartRequest(attachID)
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if err != nil {
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return err
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}
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err = hijackRequest(websocketConn, httpConn, attachStartRequest)
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if err != nil {
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return err
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}
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return nil
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}
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func createAttachStartRequest(attachID string) (*http.Request, error) {
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request, err := http.NewRequest("POST", "/containers/"+attachID+"/attach?stdin=1&stdout=1&stderr=1&stream=1", nil)
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if err != nil {
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return nil, err
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}
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request.Header.Set("Content-Type", "application/json")
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request.Header.Set("Connection", "Upgrade")
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request.Header.Set("Upgrade", "tcp")
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return request, nil
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}
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