19149648094

Committed 06 Nov 2025 08:57PM UTC coverage: 56.177% (+0.1%) from 56.051%

Build # 19149648094

Build Type

push

github

Committed by

web-flow

Commit Message

ssh: initial implementation of reverse tunnel EDS (#5915)

This implements the reverse tunnel Endpoint Discovery Service endpoint. 

There are still more tests to be written but those will be added in a
follow-up.

Run Details

246 of 308 new or added lines in 7 files covered. (79.87%)

12 existing lines in 5 files now uncovered.

28467 of 50674 relevant lines covered (56.18%)

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90.08

/pkg/ssh/stream.go

package ssh

import (
        "context"
        "iter"
        "sync"
        "sync/atomic"
        "time"

        corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
        envoy_config_endpoint_v3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
        gossh "golang.org/x/crypto/ssh"
        "google.golang.org/grpc/codes"
        "google.golang.org/grpc/status"
        "google.golang.org/protobuf/types/known/anypb"

        extensions_ssh "github.com/pomerium/envoy-custom/api/extensions/filters/network/ssh"
        "github.com/pomerium/pomerium/config"
        "github.com/pomerium/pomerium/internal/log"
        "github.com/pomerium/pomerium/pkg/grpc/databroker"
        "github.com/pomerium/pomerium/pkg/protoutil"
        "github.com/pomerium/pomerium/pkg/slices"
        "github.com/pomerium/pomerium/pkg/ssh/portforward"
)

const (
        MethodPublicKey           = "publickey"
        MethodKeyboardInteractive = "keyboard-interactive"

        ChannelTypeSession     = "session"
        ChannelTypeDirectTcpip = "direct-tcpip"

        ServiceConnection = "ssh-connection"
)

type KeyboardInteractiveQuerier interface {
        // Prompts the client and returns their responses to the given prompts.
        Prompt(ctx context.Context, prompts *extensions_ssh.KeyboardInteractiveInfoPrompts) (*extensions_ssh.KeyboardInteractiveInfoPromptResponses, error)
}

type AuthMethodResponse[T any] struct {
        Allow                    *T
        RequireAdditionalMethods []string
}

type (
        PublicKeyAuthMethodResponse           = AuthMethodResponse[extensions_ssh.PublicKeyAllowResponse]
        KeyboardInteractiveAuthMethodResponse = AuthMethodResponse[extensions_ssh.KeyboardInteractiveAllowResponse]
)

//go:generate go run go.uber.org/mock/mockgen -typed -destination ./mock/mock_auth_interface.go . AuthInterface

type AuthInterface interface {
        HandlePublicKeyMethodRequest(ctx context.Context, info StreamAuthInfo, req *extensions_ssh.PublicKeyMethodRequest) (PublicKeyAuthMethodResponse, error)
        HandleKeyboardInteractiveMethodRequest(ctx context.Context, info StreamAuthInfo, req *extensions_ssh.KeyboardInteractiveMethodRequest, querier KeyboardInteractiveQuerier) (KeyboardInteractiveAuthMethodResponse, error)
        EvaluateDelayed(ctx context.Context, info StreamAuthInfo) error
        FormatSession(ctx context.Context, info StreamAuthInfo) ([]byte, error)
        DeleteSession(ctx context.Context, info StreamAuthInfo) error
        GetDataBrokerServiceClient() databroker.DataBrokerServiceClient
}

type ClusterStatsListener interface {
        HandleClusterStatsUpdate(*envoy_config_endpoint_v3.ClusterStats)
}

type EndpointDiscoveryInterface interface {
        UpdateClusterEndpoints(added map[string]portforward.RoutePortForwardInfo, removed map[string]struct{})
}

type AuthMethodValue[T any] struct {
        attempted bool
        Value     *T
}

func (v *AuthMethodValue[T]) Update(value *T) {
        v.attempted = true
        v.Value = value
}

func (v *AuthMethodValue[T]) IsValid() bool {
        if v.attempted {
                // method was attempted - valid iff there is a value
                return v.Value != nil
        }
        return true // method was not attempted - valid
}

type StreamAuthInfo struct {
        Username                   *string
        Hostname                   *string
        StreamID                   uint64
        SourceAddress              string
        ChannelType                string
        PublicKeyFingerprintSha256 []byte
        PublicKeyAllow             AuthMethodValue[extensions_ssh.PublicKeyAllowResponse]
        KeyboardInteractiveAllow   AuthMethodValue[extensions_ssh.KeyboardInteractiveAllowResponse]
        InitialAuthComplete        bool
}

func (i *StreamAuthInfo) allMethodsValid() bool {
        return i.PublicKeyAllow.IsValid() && i.KeyboardInteractiveAllow.IsValid()
}

type StreamState struct {
        StreamAuthInfo
        RemainingUnauthenticatedMethods []string
        DownstreamChannelInfo           *extensions_ssh.SSHDownstreamChannelInfo
}

type TUIDefaultMode int

const (
        TUIModeInternalCLI TUIDefaultMode = iota
        TUIModeTunnelStatus
)

// StreamHandler handles a single SSH stream
type StreamHandler struct {
        auth       AuthInterface
        discovery  EndpointDiscoveryInterface
        config     *config.Config
        downstream *extensions_ssh.DownstreamConnectEvent
        writeC     chan *extensions_ssh.ServerMessage
        readC      chan *extensions_ssh.ClientMessage
        reauthC    chan struct{}
        terminateC chan error

        state        *StreamState
        close        func()
        portForwards *portforward.Manager

        expectingInternalChannel bool
        internalSession          atomic.Pointer[ChannelHandler]

        tuiDefaultModeLock sync.Mutex
        tuiDefaultMode     TUIDefaultMode
}

var _ StreamHandlerInterface = (*StreamHandler)(nil)

func NewStreamHandler(
        auth AuthInterface,
        discovery EndpointDiscoveryInterface,
        cfg *config.Config,
        downstream *extensions_ssh.DownstreamConnectEvent,
        onClosed func(),
) *StreamHandler {
        writeC := make(chan *extensions_ssh.ServerMessage, 32)
        sh := &StreamHandler{
                auth:       auth,
                discovery:  discovery,
                config:     cfg,
                downstream: downstream,
                writeC:     make(chan *extensions_ssh.ServerMessage, 32),
                readC:      make(chan *extensions_ssh.ClientMessage, 32),
                reauthC:    make(chan struct{}),
                terminateC: make(chan error, 1),
                close: func() {
                        onClosed()
                        close(writeC)
                },
        }
        sh.portForwards = portforward.NewManager(cfg, sh)
        sh.portForwards.AddUpdateListener(sh)
        return sh
}

// EvaluateRoute implements portforward.RouteEvaluator.
func (sh *StreamHandler) EvaluateRoute(_ portforward.RouteInfo) error {
        // Temporary stub - this is implemented separately
        return nil
}

// OnClusterEndpointsUpdated implements portforward.UpdateListener.
func (sh *StreamHandler) OnClusterEndpointsUpdated(added map[string]portforward.RoutePortForwardInfo, removed map[string]struct{}) {
        sh.discovery.UpdateClusterEndpoints(added, removed)
}

// OnPermissionsUpdated implements portforward.UpdateListener.
func (sh *StreamHandler) OnPermissionsUpdated(_ []portforward.Permission) {
}

// OnRoutesUpdated implements portforward.UpdateListener.
func (sh *StreamHandler) OnRoutesUpdated(_ []portforward.RouteInfo) {
}

func (sh *StreamHandler) Terminate(err error) {
        sh.terminateC <- err
}

func (sh *StreamHandler) Close() {
        sh.close()
}

func (sh *StreamHandler) IsExpectingInternalChannel() bool {
        return sh.expectingInternalChannel
}

func (sh *StreamHandler) ReadC() chan<- *extensions_ssh.ClientMessage {
        return sh.readC
}

func (sh *StreamHandler) WriteC() <-chan *extensions_ssh.ServerMessage {
        return sh.writeC
}

// Reauth blocks until authorization policy is reevaluated.
func (sh *StreamHandler) Reauth() {
        sh.reauthC <- struct{}{}
}

func (sh *StreamHandler) periodicReauth() (cancel func()) {
        t := time.NewTicker(1 * time.Minute)
        go func() {
                for range t.C {
                        sh.Reauth()
                }
        }()
        return t.Stop
}

// Prompt implements KeyboardInteractiveQuerier.
func (sh *StreamHandler) Prompt(ctx context.Context, prompts *extensions_ssh.KeyboardInteractiveInfoPrompts) (*extensions_ssh.KeyboardInteractiveInfoPromptResponses, error) {
        sh.sendInfoPrompts(prompts)
        select {
        case <-ctx.Done():
                return nil, context.Cause(ctx)
        case err := <-sh.terminateC:
                return nil, err
        case req := <-sh.readC:
                switch msg := req.Message.(type) {
                case *extensions_ssh.ClientMessage_InfoResponse:
                        if msg.InfoResponse.Method != MethodKeyboardInteractive {
                                return nil, status.Errorf(codes.Internal, "received invalid info response")
                        }
                        r, _ := msg.InfoResponse.Response.UnmarshalNew()
                        respInfo, ok := r.(*extensions_ssh.KeyboardInteractiveInfoPromptResponses)
                        if !ok {
                                return nil, status.Errorf(codes.InvalidArgument, "received invalid prompt response")
                        }
                        return respInfo, nil
                default:
                        return nil, status.Errorf(codes.InvalidArgument, "received invalid message, expecting info response")
                }
        }
}

func (sh *StreamHandler) Run(ctx context.Context) error {
        if sh.state != nil {
                panic("Run called twice")
        }
        sh.state = &StreamState{
                RemainingUnauthenticatedMethods: []string{MethodPublicKey},
                StreamAuthInfo: StreamAuthInfo{
                        StreamID:      sh.downstream.StreamId,
                        SourceAddress: sh.downstream.SourceAddress.GetSocketAddress().GetAddress(),
                },
        }
        cancelReauth := sh.periodicReauth()
        defer cancelReauth()
        for {
                select {
                case <-ctx.Done():
                        return context.Cause(ctx)
                case <-sh.reauthC:
                        if err := sh.reauth(ctx); err != nil {
                                return err
                        }
                case err := <-sh.terminateC:
                        return err
                case req := <-sh.readC:
                        switch req := req.Message.(type) {
                        case *extensions_ssh.ClientMessage_Event:
                                switch event := req.Event.Event.(type) {
                                case *extensions_ssh.StreamEvent_DownstreamConnected:
                                        // this was already received as the first message in the stream
                                        return status.Errorf(codes.Internal, "received duplicate downstream connected event")
                                case *extensions_ssh.StreamEvent_UpstreamConnected:
                                        log.Ctx(ctx).Debug().
                                                Msg("ssh: upstream connected")
                                case *extensions_ssh.StreamEvent_DownstreamDisconnected:
                                        log.Ctx(ctx).Debug().
                                                Uint64("stream-id", sh.downstream.StreamId).
                                                Str("reason", event.DownstreamDisconnected.Reason).
                                                Msg("ssh: downstream disconnected")
                                case nil:
                                        return status.Errorf(codes.Internal, "received invalid event")
                                }
                        case *extensions_ssh.ClientMessage_AuthRequest:
                                if err := sh.handleAuthRequest(ctx, req.AuthRequest); err != nil {
                                        return err
                                }
                        case *extensions_ssh.ClientMessage_GlobalRequest:
                                if err := sh.handleGlobalRequest(ctx, req.GlobalRequest); err != nil {
                                        return err
                                }
                        default:
                                return status.Errorf(codes.Internal, "received invalid client message type %#T", req)
                        }
                }
        }
}

func (sh *StreamHandler) handleGlobalRequest(ctx context.Context, globalRequest *extensions_ssh.GlobalRequest) error {
        sh.tuiDefaultModeLock.Lock()
        defer sh.tuiDefaultModeLock.Unlock()
        switch request := globalRequest.Request.(type) {
        case *extensions_ssh.GlobalRequest_TcpipForwardRequest:
                reqHost := request.TcpipForwardRequest.RemoteAddress
                reqPort := request.TcpipForwardRequest.RemotePort
                log.Ctx(ctx).Debug().
                        Uint64("stream-id", sh.state.StreamID).
                        Str("host", reqHost).
                        Msg("got tcpip-forward request")

                serverPort, err := sh.portForwards.AddPermission(reqHost, reqPort)
                if err != nil {
                        sh.sendGlobalRequestResponse(&extensions_ssh.GlobalRequestResponse{
                                Success:      false,
                                DebugMessage: err.Error(),
                        })
                        return nil
                }

                log.Ctx(ctx).Debug().
                        Uint64("stream-id", sh.state.StreamID).
                        Msg("sending global request success")

                // https://datatracker.ietf.org/doc/html/rfc4254#section-7.1
                if globalRequest.WantReply && reqPort == 0 {
                        sh.sendGlobalRequestResponse(&extensions_ssh.GlobalRequestResponse{
                                Success: true,
                                Response: &extensions_ssh.GlobalRequestResponse_TcpipForwardResponse{
                                        TcpipForwardResponse: &extensions_ssh.TcpipForwardResponse{
                                                ServerPort: serverPort.Value,
                                        },
                                },
                        })
                }

                sh.tuiDefaultMode = TUIModeTunnelStatus
                return nil
        case *extensions_ssh.GlobalRequest_CancelTcpipForwardRequest:
                err := sh.portForwards.RemovePermission(
                        request.CancelTcpipForwardRequest.RemoteAddress,
                        request.CancelTcpipForwardRequest.RemotePort)
                if err != nil {
                        sh.sendGlobalRequestResponse(&extensions_ssh.GlobalRequestResponse{
                                Success:      false,
                                DebugMessage: err.Error(),
                        })
                } else if globalRequest.WantReply {
                        sh.sendGlobalRequestResponse(&extensions_ssh.GlobalRequestResponse{
                                Success: true,
                        })
                }
                return nil
        default:
                return status.Errorf(codes.Unimplemented, "received unknown global request")
        }
}

func (sh *StreamHandler) sendGlobalRequestResponse(response *extensions_ssh.GlobalRequestResponse) {
        sh.writeC <- &extensions_ssh.ServerMessage{
                Message: &extensions_ssh.ServerMessage_GlobalRequestResponse{
                        GlobalRequestResponse: response,
                },
        }
}

func (sh *StreamHandler) ServeChannel(
        stream extensions_ssh.StreamManagement_ServeChannelServer,
        metadata *extensions_ssh.FilterMetadata,
) error {
        // The first channel message on this stream should be a ChannelOpen
        channelOpen, err := stream.Recv()
        if err != nil {
                return err
        }
        rawMsg, ok := channelOpen.GetMessage().(*extensions_ssh.ChannelMessage_RawBytes)
        if !ok {
                return status.Errorf(codes.InvalidArgument, "first channel message was not ChannelOpen")
        }
        var msg ChannelOpenMsg
        if err := gossh.Unmarshal(rawMsg.RawBytes.GetValue(), &msg); err != nil {
                return status.Errorf(codes.InvalidArgument, "first channel message was not ChannelOpen")
        }

        sh.state.DownstreamChannelInfo = &extensions_ssh.SSHDownstreamChannelInfo{
                ChannelType:               msg.ChanType,
                DownstreamChannelId:       msg.PeersID,
                InternalUpstreamChannelId: metadata.ChannelId,
                InitialWindowSize:         msg.PeersWindow,
                MaxPacketSize:             msg.MaxPacketSize,
        }
        sh.state.ChannelType = msg.ChanType
        channel := NewChannelImpl(sh, stream, sh.state.DownstreamChannelInfo)
        switch msg.ChanType {
        case ChannelTypeSession:
                ch := NewChannelHandler(channel, sh.config)
                if !sh.internalSession.CompareAndSwap(nil, ch) {
                        return channel.SendMessage(ChannelOpenFailureMsg{
                                PeersID: sh.state.DownstreamChannelInfo.DownstreamChannelId,
                                Reason:  Prohibited,
                                Message: "multiple concurrent internal session channels not supported",
                        })
                }
                if err := channel.SendMessage(ChannelOpenConfirmMsg{
                        PeersID:       sh.state.DownstreamChannelInfo.DownstreamChannelId,
                        MyID:          sh.state.DownstreamChannelInfo.InternalUpstreamChannelId,
                        MyWindow:      ChannelWindowSize,
                        MaxPacketSize: ChannelMaxPacket,
                }); err != nil {
                        return err
                }
                var mode TUIDefaultMode
                sh.tuiDefaultModeLock.Lock()
                mode = sh.tuiDefaultMode
                sh.tuiDefaultModeLock.Unlock()

                err := ch.Run(stream.Context(), mode)
                sh.internalSession.Store(nil)
                return err
        case ChannelTypeDirectTcpip:
                if !sh.config.Options.IsRuntimeFlagSet(config.RuntimeFlagSSHAllowDirectTcpip) {
                        return status.Errorf(codes.Unavailable, "direct-tcpip channels are not enabled")
                }
                var subMsg ChannelOpenDirectMsg
                if err := gossh.Unmarshal(msg.TypeSpecificData, &subMsg); err != nil {
                        return err
                }
                action, err := sh.PrepareHandoff(stream.Context(), subMsg.DestAddr, nil)
                if err != nil {
                        return err
                }
                return channel.SendControlAction(action)
        default:
                return status.Errorf(codes.InvalidArgument, "unexpected channel type in ChannelOpen message: %s", msg.ChanType)
        }
}

func (sh *StreamHandler) handleAuthRequest(ctx context.Context, req *extensions_ssh.AuthenticationRequest) error {
        if req.Protocol != "ssh" {
                return status.Errorf(codes.InvalidArgument, "invalid protocol: %s", req.Protocol)
        }
        if req.Service != ServiceConnection {
                return status.Errorf(codes.InvalidArgument, "invalid service: %s", req.Service)
        }
        if !slices.Contains(sh.state.RemainingUnauthenticatedMethods, req.AuthMethod) {
                return status.Errorf(codes.InvalidArgument, "unexpected auth method: %s", req.AuthMethod)
        }

        if sh.state.Username == nil {
                if req.Username == "" {
                        return status.Errorf(codes.InvalidArgument, "username missing")
                }
                sh.state.Username = &req.Username
        } else if *sh.state.Username != req.Username {
                return status.Errorf(codes.InvalidArgument, "inconsistent username")
        }
        if sh.state.Hostname == nil {
                sh.state.Hostname = &req.Hostname
        } else if *sh.state.Hostname != req.Hostname {
                return status.Errorf(codes.InvalidArgument, "inconsistent hostname")
        }

        updateMethods := func(add []string) {
                sh.state.RemainingUnauthenticatedMethods = slices.Remove(sh.state.RemainingUnauthenticatedMethods, req.AuthMethod)
                sh.state.RemainingUnauthenticatedMethods = append(sh.state.RemainingUnauthenticatedMethods, add...)
        }
        log.Ctx(ctx).Debug().
                Str("method", req.AuthMethod).
                Str("username", *sh.state.Username).
                Str("hostname", *sh.state.Hostname).
                Msg("ssh: handling auth request")

        var partial bool
        switch req.AuthMethod {
        case MethodPublicKey:
                methodReq, _ := req.MethodRequest.UnmarshalNew()
                pubkeyReq, ok := methodReq.(*extensions_ssh.PublicKeyMethodRequest)
                if !ok {
                        return status.Errorf(codes.InvalidArgument, "invalid public key method request type")
                }
                response, err := sh.auth.HandlePublicKeyMethodRequest(ctx, sh.state.StreamAuthInfo, pubkeyReq)
                if err != nil {
                        return err
                } else if response.Allow != nil {
                        partial = true
                        sh.state.PublicKeyFingerprintSha256 = pubkeyReq.PublicKeyFingerprintSha256
                }
                sh.state.PublicKeyAllow.Update(response.Allow)
                updateMethods(response.RequireAdditionalMethods)
        case MethodKeyboardInteractive:
                methodReq, _ := req.MethodRequest.UnmarshalNew()
                kbiReq, ok := methodReq.(*extensions_ssh.KeyboardInteractiveMethodRequest)
                if !ok {
                        return status.Errorf(codes.InvalidArgument, "invalid keyboard-interactive method request type")
                }
                response, err := sh.auth.HandleKeyboardInteractiveMethodRequest(ctx, sh.state.StreamAuthInfo, kbiReq, sh)
                if err != nil {
                        return err
                }
                partial = response.Allow != nil
                sh.state.KeyboardInteractiveAllow.Update(response.Allow)
                updateMethods(response.RequireAdditionalMethods)
        default:
                return status.Errorf(codes.Internal, "bug: server requested an unsupported auth method %q", req.AuthMethod)
        }
        log.Ctx(ctx).Debug().
                Str("method", req.AuthMethod).
                Bool("partial", partial).
                Strs("methods-remaining", sh.state.RemainingUnauthenticatedMethods).
                Msg("ssh: auth request complete")

        if len(sh.state.RemainingUnauthenticatedMethods) == 0 && sh.state.allMethodsValid() {
                // if there are no methods remaining, the user is allowed if all attempted
                // methods have a valid response in the state
                sh.state.InitialAuthComplete = true
                log.Ctx(ctx).Debug().Msg("ssh: all methods valid, sending allow response")
                sh.sendAllowResponse()
        } else {
                log.Ctx(ctx).Debug().Msg("ssh: unauthenticated methods remain, sending deny response")
                sh.sendDenyResponseWithRemainingMethods(partial)
        }
        return nil
}

func (sh *StreamHandler) reauth(ctx context.Context) error {
        if !sh.state.InitialAuthComplete {
                return nil
        }
        return sh.auth.EvaluateDelayed(ctx, sh.state.StreamAuthInfo)
}

func (sh *StreamHandler) PrepareHandoff(ctx context.Context, hostname string, ptyInfo *extensions_ssh.SSHDownstreamPTYInfo) (*extensions_ssh.SSHChannelControlAction, error) {
        if hostname == "" {
                return nil, status.Errorf(codes.PermissionDenied, "invalid hostname")
        }
        if sh.state.Hostname == nil {
                panic("bug: PrepareHandoff called but state is missing a hostname")
        }
        if *sh.state.Hostname != "" {
                panic("bug: PrepareHandoff called but previous hostname is not empty")
        }
        *sh.state.Hostname = hostname
        err := sh.auth.EvaluateDelayed(ctx, sh.state.StreamAuthInfo)
        if err != nil {
                return nil, status.Error(codes.PermissionDenied, err.Error())
        }
        log.Ctx(ctx).Debug().
                Str("hostname", *sh.state.Hostname).
                Str("username", *sh.state.Username).
                Msg("ssh: initiating handoff to upstream")
        upstreamAllow := sh.buildUpstreamAllowResponse()
        action := &extensions_ssh.SSHChannelControlAction{
                Action: &extensions_ssh.SSHChannelControlAction_HandOff{
                        HandOff: &extensions_ssh.SSHChannelControlAction_HandOffUpstream{
                                DownstreamChannelInfo: sh.state.DownstreamChannelInfo,
                                DownstreamPtyInfo:     ptyInfo,
                                UpstreamAuth:          upstreamAllow,
                        },
                },
        }
        return action, nil
}

func (sh *StreamHandler) FormatSession(ctx context.Context) ([]byte, error) {
        return sh.auth.FormatSession(ctx, sh.state.StreamAuthInfo)
}

func (sh *StreamHandler) DeleteSession(ctx context.Context) error {
        return sh.auth.DeleteSession(ctx, sh.state.StreamAuthInfo)
}

func (sh *StreamHandler) AllSSHRoutes() iter.Seq[*config.Policy] {
        return func(yield func(*config.Policy) bool) {
                for route := range sh.config.Options.GetAllPolicies() {
                        if route.IsSSH() {
                                if !yield(route) {
                                        return
                                }
                        }
                }
        }
}

// DownstreamChannelID implements StreamHandlerInterface.
func (sh *StreamHandler) DownstreamChannelID() uint32 {
        return sh.state.DownstreamChannelInfo.DownstreamChannelId
}

// Hostname implements StreamHandlerInterface.
func (sh *StreamHandler) Hostname() *string {
        return sh.state.Hostname
}

// Username implements StreamHandlerInterface.
func (sh *StreamHandler) Username() *string {
        return sh.state.Username
}

func (sh *StreamHandler) sendDenyResponseWithRemainingMethods(partial bool) {
        sh.writeC <- &extensions_ssh.ServerMessage{
                Message: &extensions_ssh.ServerMessage_AuthResponse{
                        AuthResponse: &extensions_ssh.AuthenticationResponse{
                                Response: &extensions_ssh.AuthenticationResponse_Deny{
                                        Deny: &extensions_ssh.DenyResponse{
                                                Partial: partial,
                                                Methods: sh.state.RemainingUnauthenticatedMethods,
                                        },
                                },
                        },
                },
        }
}

func (sh *StreamHandler) sendAllowResponse() {
        var allow *extensions_ssh.AllowResponse
        if *sh.state.Hostname == "" {
                sh.expectingInternalChannel = true
                allow = sh.buildInternalAllowResponse()
        } else {
                allow = sh.buildUpstreamAllowResponse()
        }

        sh.writeC <- &extensions_ssh.ServerMessage{
                Message: &extensions_ssh.ServerMessage_AuthResponse{
                        AuthResponse: &extensions_ssh.AuthenticationResponse{
                                Response: &extensions_ssh.AuthenticationResponse_Allow{
                                        Allow: allow,
                                },
                        },
                },
        }
}

func (sh *StreamHandler) sendInfoPrompts(prompts *extensions_ssh.KeyboardInteractiveInfoPrompts) {
        sh.writeC <- &extensions_ssh.ServerMessage{
                Message: &extensions_ssh.ServerMessage_AuthResponse{
                        AuthResponse: &extensions_ssh.AuthenticationResponse{
                                Response: &extensions_ssh.AuthenticationResponse_InfoRequest{
                                        InfoRequest: &extensions_ssh.InfoRequest{
                                                Method:  MethodKeyboardInteractive,
                                                Request: protoutil.NewAny(prompts),
                                        },
                                },
                        },
                },
        }
}

func (sh *StreamHandler) buildUpstreamAllowResponse() *extensions_ssh.AllowResponse {
        var allowedMethods []*extensions_ssh.AllowedMethod
        if value := sh.state.PublicKeyAllow.Value; value != nil {
                allowedMethods = append(allowedMethods, &extensions_ssh.AllowedMethod{
                        Method:     MethodPublicKey,
                        MethodData: protoutil.NewAny(value),
                })
        }
        if value := sh.state.KeyboardInteractiveAllow.Value; value != nil {
                allowedMethods = append(allowedMethods, &extensions_ssh.AllowedMethod{
                        Method:     MethodKeyboardInteractive,
                        MethodData: protoutil.NewAny(value),
                })
        }
        return &extensions_ssh.AllowResponse{
                Username: *sh.state.Username,
                Target: &extensions_ssh.AllowResponse_Upstream{
                        Upstream: &extensions_ssh.UpstreamTarget{
                                Hostname:       *sh.state.Hostname,
                                DirectTcpip:    sh.state.ChannelType == ChannelTypeDirectTcpip,
                                AllowedMethods: allowedMethods,
                        },
                },
        }
}

func (sh *StreamHandler) buildInternalAllowResponse() *extensions_ssh.AllowResponse {
        return &extensions_ssh.AllowResponse{
                Username: *sh.state.Username,
                Target: &extensions_ssh.AllowResponse_Internal{
                        Internal: &extensions_ssh.InternalTarget{
                                SetMetadata: &corev3.Metadata{
                                        TypedFilterMetadata: map[string]*anypb.Any{
                                                "com.pomerium.ssh": protoutil.NewAny(&extensions_ssh.FilterMetadata{
                                                        StreamId: sh.downstream.StreamId,
                                                }),
                                        },
                                },
                        },
                },
        }
}

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