useragent challenge

.gitignore

+useragent

Makefile

+all: build
+
+build:
+	go build -o useragent useragent.go

useragent.go

+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/mssola/user_agent"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	uagent := r.Header.Get("User-Agent")
+	ua := user_agent.New(uagent)
+	name, ver := ua.Browser()
+	v, e := strconv.ParseFloat(ver, 64)
+	if e != nil {
+		fmt.Println(e)
+		_, _ = w.Write([]byte(e.Error()))
+		return
+	}
+	if name == "Netscape" && v >= 7.1 {
+		_, _ = w.Write([]byte("SECURITEAM{03ff4a5fdf50dd7cd1078ba3f97507ae}"))
+	} else {
+		_, _ = w.Write([]byte("You need Netscape 7.1 or newer to view this page"))
+	}
+}
+
+func main() {
+	port := flag.String("addr", ":8080", "address to bind to")
+	flag.Parse()
+
+	for {
+		e := http.ListenAndServe(*port, http.HandlerFunc(handler))
+		if e != nil {
+			fmt.Println(e)
+		}
+		time.Sleep(time.Second)
+	}
+}

wargame.service

+[Unit]
+Description=Server
+
+[Service]
+Type=idle
+User=root
+WorkingDirectory=/home/securiteam
+ExecStart=/home/securiteam/useragent -addr :80
+Restart=always
+
+[Install]
+WantedBy=multi-user.target