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ipn/ipnserver: validate Host header on debug ServeHTMLStatus status

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Updates tailscale/corp#7948

Change-Id: I3a8c64f353af1eeae620812b2700ce4af4fbbc88
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-11-17 22:04:29 -08:00 committed by Brad Fitzpatrick
parent a13753ae1e
commit f18dde6ad1
1 changed files with 11 additions and 0 deletions
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11
ipn/ipnserver/server.go
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@ -27,6 +27,7 @@
"sync"
"syscall"
"time"
"unicode"
"go4.org/mem"
"inet.af/peercred"
@ -1024,7 +1025,17 @@ func (s *Server) localhostHandler(ci connIdentity) http.Handler {
})
}
// ServeHTMLStatus serves an HTML status page at http://localhost:41112/ for
// Windows and via $DEBUG_LISTENER/debug/ipn when tailscaled's --debug flag
// is used to run a debug server.
func (s *Server) ServeHTMLStatus(w http.ResponseWriter, r *http.Request) {
// As this is only meant for debug, verify there's no DNS name being used to
// access this.
if strings.IndexFunc(r.Host, unicode.IsLetter) != -1 {
http.Error(w, "invalid host", http.StatusForbidden)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
st := s.b.Status()
// TODO(bradfitz): add LogID and opts to st?