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fix(authenticate-users): secure SIWE verification with domain validation #1503

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fix(authenticate-users): secure SIWE verification with domain validation #1503

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20 changes: 17 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 @@ -147,12 +147,19 @@ try {
```ts Backend (Viem)
import { createPublicClient, http } from 'viem';
import { base } from 'viem/chains';
import { verifySiweMessage } from 'viem/siwe';

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 });
const { isValid } = await verifySiweMessage(client, {
address,
message,
signature,
domain: req.headers.host ?? 'yourapp.com',
});
const valid = isValid;
if (!valid) return res.status(401).json({ error: 'Invalid signature' });
// create session / JWT
res.json({ ok: true });
Expand All @@ -178,14 +185,15 @@ export async function verifySig(req, res) {
regardless of where it originated.
</Note>


### Example Express Server

```ts title="server/auth.ts" expandable
import crypto from "crypto";
import express from "express";
import { createPublicClient, http } from "viem";
import { base } from "viem/chains";

import { verifySiweMessage } from 'viem/siwe';
const app = express();
app.use(express.json());

Expand All @@ -210,7 +218,13 @@ app.post("/auth/verify", async (req, res) => {
}

// 2. Verify signature
const valid = await client.verifyMessage({ address, message, signature });
const { isValid } = await verifySiweMessage(client, {
address,
message,
signature,
domain: req.headers.host ?? 'yourapp.com',
});
const valid = isValid;
if (!valid) return res.status(401).json({ error: "Invalid signature" });

// 3. Create session / JWT here
Expand Down