From 33b9ba9abadb8cea8f5840bb11fb9de489b120e3 Mon Sep 17 00:00:00 2001
From: "kali kaneko (leap communications)" <kali@leap.se>
Date: Tue, 23 Jun 2020 19:34:47 +0200
Subject: [feat] authentication token for webapi

---
 pkg/backend/webapi.go | 38 ++++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

(limited to 'pkg/backend/webapi.go')

diff --git a/pkg/backend/webapi.go b/pkg/backend/webapi.go
index e3918c5..a8844e8 100644
--- a/pkg/backend/webapi.go
+++ b/pkg/backend/webapi.go
@@ -4,8 +4,35 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
+
+	"0xacab.org/leap/bitmask-vpn/pkg/bitmask"
 )
 
+func Adapt(h http.Handler, adapters ...Adapter) http.Handler {
+	for _, adapter := range adapters {
+		h = adapter(h)
+	}
+	return h
+}
+
+type Adapter func(http.Handler) http.Handler
+
+func CheckAuth(token string) Adapter {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			t := r.Header.Get("X-Auth-Token")
+			if t == token {
+				h.ServeHTTP(w, r)
+			} else {
+				w.WriteHeader(http.StatusUnauthorized)
+				w.Write([]byte("401 - Unauthorized"))
+			}
+
+		})
+	}
+}
+
 func webOn(w http.ResponseWriter, r *http.Request) {
 	log.Println("Web UI: on")
 	SwitchOn()
@@ -24,12 +51,15 @@ func webStatus(w http.ResponseWriter, r *http.Request) {
 func webQuit(w http.ResponseWriter, r *http.Request) {
 	log.Println("Web UI: quit")
 	Quit()
+	os.Exit(0)
 }
 
 func enableWebAPI() {
-	http.HandleFunc("/vpn/start", webOn)
-	http.HandleFunc("/vpn/stop", webOff)
-	http.HandleFunc("/vpn/status", webStatus)
-	http.HandleFunc("/vpn/quit", webQuit)
+	bitmask.GenerateAuthToken()
+	auth := CheckAuth(bitmask.ReadAuthToken())
+	http.Handle("/vpn/start", Adapt(http.HandlerFunc(webOn), auth))
+	http.Handle("/vpn/stop", Adapt(http.HandlerFunc(webOff), auth))
+	http.Handle("/vpn/status", Adapt(http.HandlerFunc(webStatus), auth))
+	http.Handle("/vpn/quit", Adapt(http.HandlerFunc(webQuit), auth))
 	http.ListenAndServe(":8080", nil)
 }
-- 
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