Spaces:
Sleeping
Sleeping
File size: 4,632 Bytes
7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 0399646 12a70ac 0399646 12a70ac 7dccad9 0399646 7dccad9 0399646 7dccad9 12a70ac 7dccad9 0399646 7dccad9 12a70ac 7dccad9 12a70ac 7dccad9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | package main
import (
"database/sql"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
_ "github.com/lib/pq"
)
type User struct {
ID int
Username string
Flag string
}
func connectDB() (*sql.DB, error) {
connStr := os.Getenv("DATABASE_URL")
if connStr == "" {
return nil, fmt.Errorf("DATABASE_URL environment variable is not set")
}
return sql.Open("postgres", connStr)
}
func main() {
// 1. Endpoint to View Source Code (Crucial for the CTF)
http.HandleFunc("/source", func(w http.ResponseWriter, r *http.Request) {
content, err := ioutil.ReadFile("main.go")
if err != nil {
http.Error(w, "Could not read source code.", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/plain")
w.Write(content)
})
// 2. Login Page
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
html := `
<!DOCTYPE html>
<html>
<head>
<title>Secure Login System v2.0</title>
<link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
</head>
<body class="bg-gray-900 text-white flex flex-col items-center justify-center h-screen">
<div class="bg-gray-800 p-8 rounded shadow-lg w-96 border-t-4 border-blue-500">
<h1 class="text-2xl mb-2 text-center font-bold text-blue-400">SECURE GATEWAY</h1>
<p class="text-gray-400 mb-6 text-center text-xs">Protected by GoWAF™ technology</p>
<form action="/login" method="POST" class="space-y-4">
<div>
<label class="block text-sm font-medium text-gray-300">Username</label>
<input type="text" name="username" class="w-full p-2 bg-gray-700 rounded border border-gray-600 focus:border-blue-500 outline-none" placeholder="Enter username">
</div>
<div>
<label class="block text-sm font-medium text-gray-300">Password</label>
<input type="password" name="password" class="w-full p-2 bg-gray-700 rounded border border-gray-600 focus:border-blue-500 outline-none" placeholder="••••••">
</div>
<button type="submit" class="w-full bg-blue-600 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded transition">AUTHENTICATE</button>
</form>
<div class="mt-6 border-t border-gray-700 pt-4 text-center">
<p class="text-xs text-gray-500">Developers only:</p>
<a href="/source" class="text-sm text-blue-400 hover:underline">View Source Code</a>
</div>
</div>
</body>
</html>
`
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(html))
})
// 3. The Hardened (but still vulnerable) Login Endpoint
http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
username := r.FormValue("username")
password := r.FormValue("password")
ua := r.Header.Get("User-Agent")
if ua != "Secure-CTF-Browser/1.0" {
http.Error(w, "Security Alert: Browser not authorized. Please use 'Secure-CTF-Browser/1.0'", http.StatusForbidden)
return
}
if username == "admin" {
http.Error(w, "Direct login as 'admin' is disabled for security reasons.", http.StatusForbidden)
return
}
if strings.Contains(username, " ") || strings.Contains(password, " ") {
http.Error(w, "WAF Detection: Spaces are not allowed in input fields.", http.StatusBadRequest)
return
}
db, err := connectDB()
if err != nil {
http.Error(w, "Database connection failed", http.StatusInternalServerError)
log.Println("DB Error:", err)
return
}
defer db.Close()
query := fmt.Sprintf("SELECT id, username, flag FROM users WHERE username = '%s' AND password = '%s'", username, password)
log.Printf("Executing Query: %s\n", query)
var user User
err = db.QueryRow(query).Scan(&user.ID, &user.Username, &user.Flag)
if err != nil {
if err == sql.ErrNoRows {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Invalid credentials."))
} else {
http.Error(w, "Query error: "+err.Error(), http.StatusInternalServerError)
}
return
}
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, `
<div style="font-family: monospace; background: #111; color: #4ade80; padding: 20px; text-align: center;">
<h1>SYSTEM BREACHED</h1>
<p>User: %s</p>
<p style="font-size: 24px; border: 1px dashed #4ade80; display: inline-block; padding: 10px;">FLAG: %s</p>
</div>
`, user.Username, user.Flag)
})
port := os.Getenv("PORT")
if port == "" {
port = "7860"
}
log.Printf("CTF Hard Mode listening on port %s", port)
log.Fatal(http.ListenAndServe(":"+port, nil))
} |