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ipn/ipnlocal,client/web: add web client to tailscaled

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Allows for serving the web interface from tailscaled, with the
ability to start and stop the server via localapi endpoints
(/web/start and /web/stop).

This will be used to run the new full management web client,
which will only be accessible over Tailscale (with an extra auth
check step over noise) from the daemon. This switch also allows
us to run the web interface as a long-lived service in environments
where the CLI version is restricted to CGI, allowing us to manage
certain auth state in memory.

ipn/ipnlocal/web is stubbed out in ipn/ipnlocal/web_stub for
ios builds to satisfy ios restriction from adding "text/template"
and "html/template" dependencies.

Updates tailscale/corp#14335

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>
This commit is contained in:
Sonia Appasamy
2023-10-11 14:35:22 -04:00
committed by Sonia Appasamy
parent 93aa8a8cff
commit 89953b015b
14 changed files with 211 additions and 12 deletions
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23
client/web/web.go
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@@ -49,8 +49,9 @@ type Server struct {
cgiMode bool
pathPrefix string
assetsHandler http.Handler // serves frontend assets
apiHandler http.Handler // serves api endpoints; csrf-protected
assetsHandler http.Handler // serves frontend assets
assetsCleanup func() // called from Server.Shutdown
// browserSessions is an in-memory cache of browser sessions for the
// full management web client, which is only accessible over Tailscale.
@@ -143,7 +144,10 @@ type ServerOpts struct {
}
// NewServer constructs a new Tailscale web client server.
func NewServer(opts ServerOpts) (s *Server, cleanup func()) {
// If err is empty, s is always non-nil.
// ctx is only required to live the duration of the NewServer call,
// and not the lifespan of the web server.
func NewServer(opts ServerOpts) (s *Server, err error) {
if opts.LocalClient == nil {
opts.LocalClient = &tailscale.LocalClient{}
}
@@ -162,7 +166,7 @@ func NewServer(opts ServerOpts) (s *Server, cleanup func()) {
s.logf = log.Printf
}
s.tsDebugMode = s.debugMode()
s.assetsHandler, cleanup = assetsHandler(opts.DevMode)
s.assetsHandler, s.assetsCleanup = assetsHandler(opts.DevMode)
var metric string // clientmetric to report on startup
@@ -182,14 +186,21 @@ func NewServer(opts ServerOpts) (s *Server, cleanup func()) {
metric = "web_client_initialization"
}
// Report metric in separate go routine with 5 second timeout.
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
// Don't block startup on reporting metric.
// Report in separate go routine with 5 second timeout.
go func() {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
s.lc.IncrementCounter(ctx, metric, 1)
}()
return s, cleanup
return s, nil
}
func (s *Server) Shutdown() {
if s.assetsCleanup != nil {
s.assetsCleanup()
}
}
// debugMode returns the debug mode the web client is being run in.