api-security-lab/app.js at main · strylee/api-security-lab · GitHub

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const express = require("express")
const bodyParser = require("body-parser")

const app = express()

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended:true}))

// fake database
const users = {
1:{id:1,name:"admin"},
2:{id:2,name:"victim"}
}


// UI template
function page(title,content){

return `

<html>

<head>

<title>${title}</title>

<style>

body{
background:#0f172a;
font-family:Arial;
color:white;
margin:0;
}

.header{
background:#020617;
padding:15px;
text-align:center;
font-size:22px;
font-weight:bold;
}

.container{
width:500px;
margin:60px auto;
background:#1e293b;
padding:30px;
border-radius:10px;
}

.panel{
background:#020617;
padding:12px;
margin-top:15px;
border-radius:6px;
}

a{
color:#60a5fa;
display:block;
margin-top:10px;
}

</style>

</head>

<body>

<div class="header">
🧪 API Security Testing Lab
</div>

<div class="container">

${content}

</div>

</body>

</html>

`

}


// homepage
app.get("/",(req,res)=>{

res.send(page("API Lab",`

<h2>API Security Practice</h2>

<div class="panel">

<b>Test APIs</b>

<a href="/api/v3/users/1">/api/v3/users/1</a>

<a href="/api/v1/users/1">/api/v1/users/1</a>

<a href="/api/users/123">/api/users/123</a>

</div>

<div class="panel">

<b>Try testing with tools:</b><br><br>

Burp Suite<br>
Postman<br>
curl

</div>

`))

})


// secure API version
app.get("/api/v3/users/:id",(req,res)=>{

let id=req.params.id

if(users[id]){

res.json(users[id])

}else{

res.json({error:"User not found"})

}

})


// old vulnerable API version
app.get("/api/v1/users/:id",(req,res)=>{

let id=req.params.id

// IDOR vulnerability
res.json({
user_id:id,
message:"Old API version (less secure)"
})

})


// verb tampering example
app.all("/api/trips/:id",(req,res)=>{

res.json({
method:req.method,
trip_id:req.params.id
})

})


// HTTP parameter pollution
app.get("/api/profile",(req,res)=>{

let user=req.query.user_id

res.json({
requested_user:user
})

})


// JSON parameter pollution
app.post("/api/profile",(req,res)=>{

res.json({
received:req.body
})

})


// header manipulation
app.get("/api/header-user",(req,res)=>{

let id=req.headers["x-user-id"]

res.json({
user:id
})

})


// content-type test
app.post("/api/content",(req,res)=>{

res.json({
content_type:req.headers["content-type"],
body:req.body
})

})


// wildcard route (FIXED)
app.get(/^\/api\/users\/.*/, (req,res)=>{

res.json({
message:"Wildcard endpoint accessed",
url:req.originalUrl
})

})


app.listen(3002,()=>{

console.log("API Security Lab running on http://localhost:3002")

})