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diff --git a/keyserver/src/deleters/siwe-nonce-deleters.js b/keyserver/src/deleters/siwe-nonce-deleters.js
--- a/keyserver/src/deleters/siwe-nonce-deleters.js
+++ b/keyserver/src/deleters/siwe-nonce-deleters.js
@@ -9,9 +9,21 @@
const earliestValidCreationTime = Date.now() - nonceLifetime;
const query = SQL`
DELETE FROM siwe_nonces
- WHERE creation_time < ${earliestValidCreationTime}
+ WHERE creation_time < ${earliestValidCreationTime}
`;
await dbQuery(query);
}
-export { deleteStaleSIWENonceEntries };
+async function checkAndInvalidateSIWENonceEntry(
+ nonce: string,
+): Promise<boolean> {
+ const earliestValidCreationTime = Date.now() - nonceLifetime;
+ const query = SQL`
+ DELETE FROM siwe_nonces
+ WHERE nonce = ${nonce} AND creation_time > ${earliestValidCreationTime}
+ `;
+ const [result] = await dbQuery(query);
+ return result.affectedRows && result.affectedRows > 0;
+}
+
+export { deleteStaleSIWENonceEntries, checkAndInvalidateSIWENonceEntry };
diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
--- a/keyserver/src/responders/user-responders.js
+++ b/keyserver/src/responders/user-responders.js
@@ -47,6 +47,7 @@
import { dbQuery, SQL } from '../database/database';
import { deleteAccount } from '../deleters/account-deleters';
import { deleteCookie } from '../deleters/cookie-deleters';
+import { checkAndInvalidateSIWENonceEntry } from '../deleters/siwe-nonce-deleters.js';
import { fetchEntryInfos } from '../fetchers/entry-fetchers';
import { fetchMessageInfos } from '../fetchers/message-fetchers';
import { fetchThreadInfos } from '../fetchers/thread-fetchers';
@@ -316,6 +317,16 @@
throw new ServerError('invalid_parameters');
}
+ // 2. Ensure that the `nonce` exists in the `siwe_nonces` table
+ // AND hasn't expired. If those conditions are met, delete the entry to
+ // ensure that the same `nonce` can't be re-used in a future request.
+ const wasNonceCheckedAndInvalidated = await checkAndInvalidateSIWENonceEntry(
+ siweMessage.nonce,
+ );
+ if (!wasNonceCheckedAndInvalidated) {
+ throw new ServerError('invalid_parameters');
+ }
+
return false;
}

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