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fix: sanitize claim_id to prevent XSS in claim page HTML response #19

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fix: sanitize claim_id to prevent XSS in claim page HTML response #19

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27 changes: 18 additions & 9 deletions lensmint-public-server/server.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,15 @@ require('dotenv').config();

const dbService = require('./dbService');

function escapeHtml(str) {
return String(str)
.replace(/&/g, '&')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/"/g, '&quot;')
.replace(/'/g, '&#039;');
}

const app = express();
const PORT = process.env.PORT || 5001;

Expand Down Expand Up @@ -260,7 +269,7 @@ app.get('/verify/:claim_id', async (req, res) => {
</head>
<body>
<h1 class="error">Claim Not Found</h1>
<p>The claim ID "${claim_id}" does not exist.</p>
<p>The claim ID "${escapeHtml(claim_id)}" does not exist.</p>
</body>
</html>
`);
Expand Down Expand Up @@ -346,7 +355,7 @@ app.get('/verify/:claim_id', async (req, res) => {
<body>
<div class="container">
<h1>🔐 ZK Proof Verification</h1>
<p class="subtitle">Claim ID: ${claim_id}</p>
<p class="subtitle">Claim ID: ${escapeHtml(claim_id)}</p>

<div class="grid">
<div class="card">
Expand Down Expand Up @@ -428,8 +437,8 @@ app.get('/verify/:claim_id', async (req, res) => {
</div>

<div style="margin-top: 30px; text-align: center;">
<a href="/claim/${claim_id}" class="btn">View Claim Page</a>
<a href="/api/metadata/${claim_id}" class="btn" style="margin-left: 10px;">View Metadata API</a>
<a href="/claim/${escapeHtml(claim_id)}" class="btn">View Claim Page</a>
<a href="/api/metadata/${escapeHtml(claim_id)}" class="btn" style="margin-left: 10px;">View Metadata API</a>
</div>
</div>
</body>
Expand All @@ -443,7 +452,7 @@ app.get('/verify/:claim_id', async (req, res) => {
<head><title>Error</title></head>
<body>
<h1>Error</h1>
<p>${error.message}</p>
<p>${escapeHtml(error.message)}</p>
</body>
</html>
`);
Expand Down Expand Up @@ -507,7 +516,7 @@ app.get('/claim/:claim_id', (req, res) => {
</head>
<body>
<h1 class="error">Claim Not Found</h1>
<p>The claim ID "${claim_id}" does not exist.</p>
<p>The claim ID "${escapeHtml(claim_id)}" does not exist.</p>
</body>
</html>
`);
Expand Down Expand Up @@ -781,17 +790,17 @@ app.get('/claim/:claim_id', (req, res) => {
</form>

<div id="message"></div>
<div class="claim-id">Claim ID: ${claim_id}</div>
<div class="claim-id">Claim ID: ${escapeHtml(claim_id)}</div>

<div style="margin-top: 20px; text-align: center; padding-top: 20px; border-top: 1px solid #e0e0e0;">
<a href="/verify/${claim_id}" class="proof-link">
<a href="/verify/${escapeHtml(claim_id)}" class="proof-link">
🔐 Check ZK Proof Verification
</a>
</div>
</div>

<script>
const claimId = '${claim_id}';
const claimId = '${escapeHtml(claim_id)}';
const form = document.getElementById('claimForm');
const submitBtn = document.getElementById('submitBtn');
const messageDiv = document.getElementById('message');
Expand Down