@zkp2p/reclaim-witness-sdk
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200 lines • 17.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.assertValidClaimRequest = assertValidClaimRequest;
exports.assertValidProviderTranscript = assertValidProviderTranscript;
exports.assertTranscriptsMatch = assertTranscriptsMatch;
exports.decryptTranscript = decryptTranscript;
exports.getWithoutHeader = getWithoutHeader;
const tls_1 = require("@reclaimprotocol/tls");
const api_1 = require("../../proto/api");
const providers_1 = require("../../providers");
const generics_1 = require("../../server/utils/generics");
const process_handshake_1 = require("../../server/utils/process-handshake");
const utils_1 = require("../../utils");
const signatures_1 = require("../../utils/signatures");
/**
* Asserts that the claim request is valid.
*
* 1. We begin by verifying the signature of the claim request.
* 2. Next, we produce the transcript of the TLS exchange
* from the proofs provided by the client.
* 3. We then pull the provider the client is trying to claim
* from
* 4. We then use the provider's verification function to verify
* whether the claim is valid.
*
* If any of these steps fail, we throw an error.
*/
async function assertValidClaimRequest(request, metadata, logger) {
var _a;
const { data, signatures: { requestSignature } = {}, zkEngine, fixedServerIV, fixedClientIV } = request;
if (!data) {
throw new utils_1.AttestorError('ERROR_INVALID_CLAIM', 'No info provided on claim request');
}
if (!(requestSignature === null || requestSignature === void 0 ? void 0 : requestSignature.length)) {
throw new utils_1.AttestorError('ERROR_INVALID_CLAIM', 'No signature provided on claim request');
}
// verify request signature
const serialisedReq = api_1.ClaimTunnelRequest
.encode({ ...request, signatures: undefined })
.finish();
const { verify: verifySig } = signatures_1.SIGNATURES[metadata.signatureType];
const verified = await verifySig(serialisedReq, requestSignature, data.owner);
if (!verified) {
throw new utils_1.AttestorError('ERROR_INVALID_CLAIM', 'Invalid signature on claim request');
}
const receipt = await decryptTranscript(request.transcript, logger, zkEngine === api_1.ZKProofEngine.ZK_ENGINE_GNARK ? 'gnark' : 'snarkjs', fixedServerIV, fixedClientIV);
const reqHost = (_a = request.request) === null || _a === void 0 ? void 0 : _a.host;
if (receipt.hostname !== reqHost) {
throw new Error(`Expected server name ${reqHost}, got ${receipt.hostname}`);
}
// get all application data messages
const applData = (0, utils_1.extractApplicationDataFromTranscript)(receipt);
const newData = await assertValidProviderTranscript(applData, data, logger, { version: metadata.clientVersion });
if (newData !== data) {
logger.info({ newData }, 'updated claim info');
}
return newData;
}
/**
* Verify that the transcript contains a valid claim
* for the provider.
*/
async function assertValidProviderTranscript(applData, info, logger, providerCtx) {
var _a;
const providerName = info.provider;
const provider = providers_1.providers[providerName];
if (!provider) {
throw new utils_1.AttestorError('ERROR_INVALID_CLAIM', `Unsupported provider: ${providerName}`);
}
const params = (0, generics_1.niceParseJsonObject)(info.parameters, 'params');
const ctx = (0, generics_1.niceParseJsonObject)(info.context, 'context');
(0, utils_1.assertValidateProviderParams)(providerName, params);
const rslt = await provider.assertValidProviderReceipt({
receipt: applData,
params,
logger,
ctx: providerCtx
});
ctx.providerHash = (0, utils_1.hashProviderParams)(params);
const extractedParameters = (rslt === null || rslt === void 0 ? void 0 : rslt.extractedParameters) || {};
if (Object.keys(extractedParameters).length) {
ctx.extractedParameters = extractedParameters;
}
info.context = (_a = (0, utils_1.canonicalStringify)(ctx)) !== null && _a !== void 0 ? _a : '';
return info;
}
/**
* Verify that the transcript provided by the client
* matches the transcript of the tunnel, the server
* has created.
*/
function assertTranscriptsMatch(clientTranscript, tunnelTranscript) {
const clientSends = (0, tls_1.concatenateUint8Arrays)(clientTranscript
.filter(m => m.sender === api_1.TranscriptMessageSenderType.TRANSCRIPT_MESSAGE_SENDER_TYPE_CLIENT)
.map(m => m.message));
const tunnelSends = (0, tls_1.concatenateUint8Arrays)(tunnelTranscript
.filter(m => m.sender === 'client')
.map(m => m.message));
if (!(0, tls_1.areUint8ArraysEqual)(clientSends, tunnelSends)) {
throw utils_1.AttestorError.badRequest('Outgoing messages from client do not match the tunnel transcript');
}
const clientRecvs = (0, tls_1.concatenateUint8Arrays)(clientTranscript
.filter(m => m.sender === api_1.TranscriptMessageSenderType.TRANSCRIPT_MESSAGE_SENDER_TYPE_SERVER)
.map(m => m.message));
const tunnelRecvs = (0, tls_1.concatenateUint8Arrays)(tunnelTranscript
.filter(m => m.sender === 'server')
.map(m => m.message))
// We only need to compare the first N messages
// that the client claims to have received
// the rest are not relevant -- so even if they're
// not present in the tunnel transcript, it's fine
.slice(0, clientRecvs.length);
if (!(0, tls_1.areUint8ArraysEqual)(clientRecvs, tunnelRecvs)) {
throw utils_1.AttestorError.badRequest('Incoming messages from server do not match the tunnel transcript');
}
}
async function decryptTranscript(transcript, logger, zkEngine, serverIV, clientIV) {
const { tlsVersion, cipherSuite, hostname, nextMsgIndex } = await (0, process_handshake_1.processHandshake)(transcript, logger);
let clientRecordNumber = tlsVersion === 'TLS1_3' ? -1 : 0; // TLS 1.3 has already one record encrypted at this point
let serverRecordNumber = clientRecordNumber;
transcript = transcript.slice(nextMsgIndex);
const decryptedTranscript = [];
for (const [i, { sender, message, reveal: { zkReveal, directReveal } = {} }] of transcript.entries()) {
//start with first message after last handshake message
await getDecryptedMessage(sender, message, directReveal, zkReveal, i);
}
return {
transcript: decryptedTranscript,
hostname: hostname,
tlsVersion: tlsVersion,
};
async function getDecryptedMessage(sender, message, directReveal, zkReveal, i) {
var _a, _b;
try {
const isServer = sender === api_1.TranscriptMessageSenderType
.TRANSCRIPT_MESSAGE_SENDER_TYPE_SERVER;
const recordHeader = message.slice(0, 5);
const content = getWithoutHeader(message);
if (isServer) {
serverRecordNumber++;
}
else {
clientRecordNumber++;
}
let redacted = true;
let plaintext = undefined;
let plaintextLength;
if ((_a = directReveal === null || directReveal === void 0 ? void 0 : directReveal.key) === null || _a === void 0 ? void 0 : _a.length) {
const result = await (0, utils_1.decryptDirect)(directReveal, cipherSuite, recordHeader, tlsVersion, content);
plaintext = result.plaintext;
redacted = false;
plaintextLength = plaintext.length;
}
else if ((_b = zkReveal === null || zkReveal === void 0 ? void 0 : zkReveal.proofs) === null || _b === void 0 ? void 0 : _b.length) {
const result = await (0, utils_1.verifyZkPacket)({
ciphertext: content,
zkReveal,
logger,
cipherSuite,
zkEngine: zkEngine,
iv: sender === api_1.TranscriptMessageSenderType
.TRANSCRIPT_MESSAGE_SENDER_TYPE_SERVER
? serverIV
: clientIV,
recordNumber: isServer
? serverRecordNumber
: clientRecordNumber
});
plaintext = result.redactedPlaintext;
redacted = false;
plaintextLength = plaintext.length;
}
else {
plaintext = content;
plaintextLength = plaintext.length;
}
decryptedTranscript.push({
sender: sender === api_1.TranscriptMessageSenderType
.TRANSCRIPT_MESSAGE_SENDER_TYPE_CLIENT
? 'client'
: 'server',
redacted,
message: plaintext,
recordHeader,
plaintextLength,
});
}
catch (error) {
throw new utils_1.AttestorError('ERROR_INVALID_CLAIM', `error in handling packet at idx ${i}: ${error}`, {
packetIdx: i,
error: error,
});
}
}
}
function getWithoutHeader(message) {
// strip the record header (xx 03 03 xx xx)
return message.slice(5);
}
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