tailscale: Add tailssh server

adapter/platform.go

@@ -44,6 +44,22 @@ type PlatformInterface interface {
 	UsePlatformNeighborResolver() bool
 	StartNeighborMonitor(listener NeighborUpdateListener) error
 	CloseNeighborMonitor(listener NeighborUpdateListener) error
+
+	UsePlatformShell() bool
+	CheckPlatformShell() error
+	OpenShellSession(user *PlatformUser, command string, env []string, term string, rows int32, cols int32) (ShellSession, error)
+	LookupUser(username string) (*PlatformUser, error)
+	LookupSFTPServer() (string, error)
+	ReadSystemSSHHostKey() ([]byte, error)
+}
+
+type PlatformUser struct {
+	Username string
+	Uid      int
+	Gid      int
+	HomeDir  string
+	Shell    string
+	Groups   []int
 }
 
 type FindConnectionOwnerRequest struct {

adapter/tailscale.go

@@ -54,3 +54,11 @@ type TailscalePeer struct {
 	KeyExpiry      int64
 	LastSeen       int64
 }
+
+type ShellSession interface {
+	MasterFD() int32
+	Resize(rows int32, cols int32) error
+	Signal(signal int32) error
+	WaitExit() (int32, error)
+	Close() error
+}