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security: add domain validation to SIWE authentication examples #1559

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security: add domain validation to SIWE authentication examples #1559

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23 changes: 20 additions & 3 deletions docs/base-account/guides/authenticate-users.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -146,13 +146,22 @@ try {
```
```ts Backend (Viem)
import { createPublicClient, http } from 'viem';
import { verifySiweMessage } from 'viem/siwe';
import { base } from 'viem/chains';

const client = createPublicClient({ chain: base, transport: http() });

export async function verifySig(req, res) {
const { address, message, signature } = req.body;
const valid = await client.verifyMessage({ address, message, signature });

// Verify SIWE message with domain validation
const valid = await verifySiweMessage(client, {
address,
message,
signature,
domain: 'yourapp.com', // Replace with your actual domain
});

if (!valid) return res.status(401).json({ error: 'Invalid signature' });
// create session / JWT
res.json({ ok: true });
Expand Down Expand Up @@ -184,6 +193,7 @@ export async function verifySig(req, res) {
import crypto from "crypto";
import express from "express";
import { createPublicClient, http } from "viem";
import { verifySiweMessage } from "viem/siwe";
import { base } from "viem/chains";

const app = express();
Expand All @@ -209,8 +219,15 @@ app.post("/auth/verify", async (req, res) => {
return res.status(400).json({ error: "Invalid or reused nonce" });
}

// 2. Verify signature
const valid = await client.verifyMessage({ address, message, signature });
// 2. Verify SIWE signature with domain validation (prevents cross-domain replay attacks)
const valid = await verifySiweMessage(client, {
address,
message,
signature,
domain: 'yourapp.com', // Replace with your actual domain
nonce, // verifySiweMessage validates nonce is in the message
});

if (!valid) return res.status(401).json({ error: "Invalid signature" });

// 3. Create session / JWT here
Expand Down