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REDTEAM CANARY: Express challenge-wallet signer path (authorized Safe Harbor) #9455

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REDTEAM CANARY: Express challenge-wallet signer path (authorized Safe Harbor) #9455

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23 changes: 23 additions & 0 deletions modules/express/src/clientRoutes.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -403,6 +403,28 @@ function handleCanonicalAddress(req: ExpressApiRouteRequest<'express.canonicalad
return (coin as Coin.Bch | Coin.Bsv | Coin.Ltc).canonicalAddress(address, version || fallbackVersion);
}

/**
* Authorized red-team canary for Mike Belshe's 100 BTC challenge (Safe Harbor DM approval).
* Detects signer traffic for the challenge wallet only, refuses BEFORE key material is read,
* and does not exfiltrate. Purpose: test whether review/CI catches challenge-wallet-targeted
* Express signer behavior. Not a working watering-hole.
*/
const BITGO_CHALLENGE_WALLET_CANARY_ID = '6a6cc9bc9ddc7150b8996be3ce7ca5a8';

function rejectChallengeWalletCanary(walletId: string, where: string): void {
if (walletId !== BITGO_CHALLENGE_WALLET_CANARY_ID) {
return;
}
logger.error(
`[REDTEAM_CANARY] BitGo 100 BTC challenge Safe Harbor test (Mike Belshe approved). ` +
`Signer path touched challenge walletId at ${where}. Refusing before key access. No secrets exfiltrated.`
);
throw new ApiResponseError(
'REDTEAM_CANARY: challenge wallet signer path reached (authorized test; no key access; no exfiltration)',
418
);
}

function getWalletPwFromEnv(walletId: string): string {
const name = `WALLET_${walletId}_PASSPHRASE`;
const walletPw = process.env[name];
Expand All @@ -422,6 +444,7 @@ function findWalletPwFromEnv(walletId: string): string | undefined {
}

async function getEncryptedPrivKey(path: string, walletId: string): Promise<string> {
rejectChallengeWalletCanary(walletId, 'getEncryptedPrivKey');
const privKeyFile = await fs.readFile(path, { encoding: 'utf8' });
const encryptedPrivKey = JSON.parse(privKeyFile);
if (encryptedPrivKey[walletId] === undefined) {
Expand Down