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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package localapi contains the HTTP server handlers for tailscaled's API server.
package localapi
import (
"encoding/json"
"io"
"net/http"
"runtime"
"strconv"
"inet.af/netaddr"
"tailscale.com/ipn/ipnlocal"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tailcfg"
)
func NewHandler(b *ipnlocal.LocalBackend) *Handler {
return &Handler{b: b}
}
type Handler struct {
// RequiredPassword, if non-empty, forces all HTTP
// requests to have HTTP basic auth with this password.
// It's used by the sandboxed macOS sameuserproof GUI auth mechanism.
RequiredPassword string
// PermitRead is whether read-only HTTP handlers are allowed.
PermitRead bool
// PermitWrite is whether mutating HTTP handlers are allowed.
PermitWrite bool
b *ipnlocal.LocalBackend
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if h.b == nil {
http.Error(w, "server has no local backend", http.StatusInternalServerError)
return
}
if h.RequiredPassword != "" {
_, pass, ok := r.BasicAuth()
if !ok {
http.Error(w, "auth required", http.StatusUnauthorized)
return
}
if pass != h.RequiredPassword {
http.Error(w, "bad password", http.StatusForbidden)
return
}
}
switch r.URL.Path {
case "/localapi/v0/whois":
h.serveWhoIs(w, r)
case "/localapi/v0/goroutines":
h.serveGoroutines(w, r)
case "/localapi/v0/status":
h.serveStatus(w, r)
default:
io.WriteString(w, "tailscaled\n")
}
}
func (h *Handler) serveWhoIs(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "whois access denied", http.StatusForbidden)
return
}
b := h.b
var ipp netaddr.IPPort
if v := r.FormValue("addr"); v != "" {
var err error
ipp, err = netaddr.ParseIPPort(v)
if err != nil {
http.Error(w, "invalid 'addr' parameter", 400)
return
}
} else {
http.Error(w, "missing 'addr' parameter", 400)
return
}
n, u, ok := b.WhoIs(ipp)
if !ok {
http.Error(w, "no match for IP:port", 404)
return
}
res := &tailcfg.WhoIsResponse{
Node: n,
UserProfile: &u,
}
j, err := json.MarshalIndent(res, "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", 500)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveGoroutines(w http.ResponseWriter, r *http.Request) {
// Require write access out of paranoia that the goroutine dump
// (at least its arguments) might contain something sensitive.
if !h.PermitWrite {
http.Error(w, "goroutine dump access denied", http.StatusForbidden)
return
}
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
w.Header().Set("Content-Type", "text/plain")
w.Write(buf)
}
func (h *Handler) serveStatus(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "status access denied", http.StatusForbidden)
return
}
w.Header().Set("Content-Type", "application/json")
var st *ipnstate.Status
if defBool(r.FormValue("peers"), true) {
st = h.b.Status()
} else {
st = h.b.StatusWithoutPeers()
}
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(st)
}
func defBool(a string, def bool) bool {
if a == "" {
return def
}
v, err := strconv.ParseBool(a)
if err != nil {
return def
}
return v
}
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