/* global dcodeIO, Backbone, _, libsignal, textsecure, ConversationController, stringObject, BlockedNumberController */ /* eslint-disable no-proto */ // eslint-disable-next-line func-names (function() { 'use strict'; const TIMESTAMP_THRESHOLD = 5 * 1000; // 5 seconds const Direction = { SENDING: 1, RECEIVING: 2, }; const VerifiedStatus = { DEFAULT: 0, VERIFIED: 1, UNVERIFIED: 2, }; function validateVerifiedStatus(status) { if ( status === VerifiedStatus.DEFAULT || status === VerifiedStatus.VERIFIED || status === VerifiedStatus.UNVERIFIED ) { return true; } return false; } const StaticByteBufferProto = new dcodeIO.ByteBuffer().__proto__; const StaticArrayBufferProto = new ArrayBuffer().__proto__; const StaticUint8ArrayProto = new Uint8Array().__proto__; function isStringable(thing) { return ( thing === Object(thing) && (thing.__proto__ === StaticArrayBufferProto || thing.__proto__ === StaticUint8ArrayProto || thing.__proto__ === StaticByteBufferProto) ); } function convertToArrayBuffer(thing) { if (thing === undefined) { return undefined; } if (thing === Object(thing)) { if (thing.__proto__ === StaticArrayBufferProto) { return thing; } // TODO: Several more cases here... } if (thing instanceof Array) { // Assuming Uint16Array from curve25519 const res = new ArrayBuffer(thing.length * 2); const uint = new Uint16Array(res); for (let i = 0; i < thing.length; i += 1) { uint[i] = thing[i]; } return res; } let str; if (isStringable(thing)) { str = stringObject(thing); } else if (typeof thing === 'string') { str = thing; } else { throw new Error( `Tried to convert a non-stringable thing of type ${typeof thing} to an array buffer` ); } const res = new ArrayBuffer(str.length); const uint = new Uint8Array(res); for (let i = 0; i < str.length; i += 1) { uint[i] = str.charCodeAt(i); } return res; } function equalArrayBuffers(ab1, ab2) { if (!(ab1 instanceof ArrayBuffer && ab2 instanceof ArrayBuffer)) { return false; } if (ab1.byteLength !== ab2.byteLength) { return false; } let result = 0; const ta1 = new Uint8Array(ab1); const ta2 = new Uint8Array(ab2); for (let i = 0; i < ab1.byteLength; i += 1) { // eslint-disable-next-line no-bitwise result |= ta1[i] ^ ta2[i]; } return result === 0; } const IdentityRecord = Backbone.Model.extend({ storeName: 'identityKeys', validAttributes: [ 'id', 'publicKey', 'firstUse', 'timestamp', 'verified', 'nonblockingApproval', ], validate(attrs) { const attributeNames = _.keys(attrs); const { validAttributes } = this; const allValid = _.all(attributeNames, attributeName => _.contains(validAttributes, attributeName) ); if (!allValid) { return new Error('Invalid identity key attribute names'); } const allPresent = _.all(validAttributes, attributeName => _.contains(attributeNames, attributeName) ); if (!allPresent) { return new Error('Missing identity key attributes'); } if (typeof attrs.id !== 'string') { return new Error('Invalid identity key id'); } if (!(attrs.publicKey instanceof ArrayBuffer)) { return new Error('Invalid identity key publicKey'); } if (typeof attrs.firstUse !== 'boolean') { return new Error('Invalid identity key firstUse'); } if (typeof attrs.timestamp !== 'number' || !(attrs.timestamp >= 0)) { return new Error('Invalid identity key timestamp'); } if (!validateVerifiedStatus(attrs.verified)) { return new Error('Invalid identity key verified'); } if (typeof attrs.nonblockingApproval !== 'boolean') { return new Error('Invalid identity key nonblockingApproval'); } return null; }, }); function SignalProtocolStore() {} async function _hydrateCache(object, field, items, idField) { const cache = Object.create(null); for (let i = 0, max = items.length; i < max; i += 1) { const item = items[i]; const id = item[idField]; cache[id] = item; } window.log.info(`SignalProtocolStore: Finished caching ${field} data`); // eslint-disable-next-line no-param-reassign object[field] = cache; } SignalProtocolStore.prototype = { constructor: SignalProtocolStore, async hydrateCaches() { await Promise.all([ _hydrateCache( this, 'identityKeys', await window.Signal.Data.getAllIdentityKeys(), 'id' ), _hydrateCache( this, 'sessions', await window.Signal.Data.getAllSessions(), 'id' ), _hydrateCache( this, 'preKeys', await window.Signal.Data.getAllPreKeys(), 'id' ), _hydrateCache( this, 'signedPreKeys', await window.Signal.Data.getAllSignedPreKeys(), 'id' ), ]); }, async getIdentityKeyPair() { const item = await window.Signal.Data.getItemById('identityKey'); if (item) { return item.value; } window.log.error('Could not load identityKey from SignalData'); return undefined; }, async getLocalRegistrationId() { const item = await window.Signal.Data.getItemById('registrationId'); if (item) { return item.value; } return 1; }, // PreKeys async loadPreKey(keyId) { const key = this.preKeys[keyId]; if (key) { window.log.info('Successfully fetched prekey:', keyId); return { pubKey: key.publicKey, privKey: key.privateKey, }; } // throw new textsecure.PreKeyMissing(); return undefined; }, async loadPreKeyForContact(contactPubKey) { const key = await window.Signal.Data.getPreKeyByRecipient(contactPubKey); if (key) { window.log.info( 'Successfully fetched prekey for recipient:', contactPubKey ); return { pubKey: key.publicKey, privKey: key.privateKey, keyId: key.id, recipient: key.recipient, }; } return undefined; }, async storePreKey(keyId, keyPair, contactPubKey) { const data = { id: keyId, publicKey: keyPair.pubKey, privateKey: keyPair.privKey, recipient: contactPubKey, }; this.preKeys[keyId] = data; await window.Signal.Data.createOrUpdatePreKey(data); }, async removePreKey(keyId) { try { this.trigger('removePreKey'); } catch (error) { window.log.error( 'removePreKey error triggering removePreKey:', error && error.stack ? error.stack : error ); } delete this.preKeys[keyId]; await window.Signal.Data.removePreKeyById(keyId); }, async clearPreKeyStore() { this.preKeys = Object.create(null); await window.Signal.Data.removeAllPreKeys(); }, // Signed PreKeys /* Returns a signed keypair object or undefined */ async loadSignedPreKey(keyId) { const key = this.signedPreKeys[keyId]; if (key) { window.log.info('Successfully fetched signed prekey:', key.id); return { pubKey: key.publicKey, privKey: key.privateKey, created_at: key.created_at, keyId: key.id, confirmed: key.confirmed, signature: key.signature, }; } window.log.error('Failed to fetch signed prekey:', keyId); return undefined; }, async loadSignedPreKeys() { if (arguments.length > 0) { throw new Error('loadSignedPreKeys takes no arguments'); } const keys = Object.values(this.signedPreKeys); return keys.map(prekey => ({ pubKey: prekey.publicKey, privKey: prekey.privateKey, created_at: prekey.created_at, keyId: prekey.id, confirmed: prekey.confirmed, signature: prekey.signature, })); }, async storeSignedPreKey(keyId, keyPair, confirmed, signature) { const data = { id: keyId, publicKey: keyPair.pubKey, privateKey: keyPair.privKey, created_at: Date.now(), confirmed: Boolean(confirmed), signature, }; this.signedPreKeys[keyId] = data; await window.Signal.Data.createOrUpdateSignedPreKey(data); }, async removeSignedPreKey(keyId) { delete this.signedPreKeys[keyId]; await window.Signal.Data.removeSignedPreKeyById(keyId); }, async clearSignedPreKeysStore() { this.signedPreKeys = Object.create(null); await window.Signal.Data.removeAllSignedPreKeys(); }, // Sessions async loadSession(encodedNumber) { if (encodedNumber === null || encodedNumber === undefined) { throw new Error('Tried to get session for undefined/null number'); } const session = this.sessions[encodedNumber]; if (session) { return session.record; } return undefined; }, async storeSession(encodedNumber, record) { if (encodedNumber === null || encodedNumber === undefined) { throw new Error('Tried to put session for undefined/null number'); } const unencoded = textsecure.utils.unencodeNumber(encodedNumber); const number = unencoded[0]; const deviceId = parseInt(unencoded[1], 10); const data = { id: encodedNumber, number, deviceId, record, }; this.sessions[encodedNumber] = data; await window.Signal.Data.createOrUpdateSession(data); }, async getDeviceIds(number) { if (number === null || number === undefined) { throw new Error('Tried to get device ids for undefined/null number'); } const allSessions = Object.values(this.sessions); const sessions = allSessions.filter(session => session.number === number); return _.pluck(sessions, 'deviceId'); }, async removeAllSessions(number) { if (number === null || number === undefined) { throw new Error('Tried to remove sessions for undefined/null number'); } const allSessions = Object.values(this.sessions); for (let i = 0, max = allSessions.length; i < max; i += 1) { const session = allSessions[i]; if (session.number === number) { delete this.sessions[session.id]; } } await window.Signal.Data.removeSessionsByNumber(number); }, async archiveSiblingSessions(identifier) { const address = libsignal.SignalProtocolAddress.fromString(identifier); const deviceIds = await this.getDeviceIds(address.getName()); const siblings = _.without(deviceIds, address.getDeviceId()); await Promise.all( siblings.map(async deviceId => { const sibling = new libsignal.SignalProtocolAddress( address.getName(), deviceId ); window.log.info('closing session for', sibling.toString()); const sessionCipher = new libsignal.SessionCipher( textsecure.storage.protocol, sibling ); await sessionCipher.closeOpenSessionForDevice(); }) ); }, async archiveAllSessions(number) { const deviceIds = await this.getDeviceIds(number); await Promise.all( deviceIds.map(async deviceId => { const address = new libsignal.SignalProtocolAddress(number, deviceId); window.log.info('closing session for', address.toString()); const sessionCipher = new libsignal.SessionCipher( textsecure.storage.protocol, address ); await sessionCipher.closeOpenSessionForDevice(); }) ); }, async clearSessionStore() { this.sessions = Object.create(null); window.Signal.Data.removeAllSessions(); }, // Identity Keys async isTrustedIdentity(identifier, publicKey, direction) { if (identifier === null || identifier === undefined) { throw new Error('Tried to get identity key for undefined/null key'); } const number = textsecure.utils.unencodeNumber(identifier)[0]; const isOurNumber = number === textsecure.storage.user.getNumber(); const identityRecord = this.identityKeys[number]; if (isOurNumber) { const existing = identityRecord ? identityRecord.publicKey : null; return equalArrayBuffers(existing, publicKey); } switch (direction) { case Direction.SENDING: return this.isTrustedForSending(publicKey, identityRecord); case Direction.RECEIVING: return true; default: throw new Error(`Unknown direction: ${direction}`); } }, isTrustedForSending(publicKey, identityRecord) { if (!identityRecord) { window.log.info( 'isTrustedForSending: No previous record, returning true...' ); return true; } const existing = identityRecord.publicKey; if (!existing) { window.log.info('isTrustedForSending: Nothing here, returning true...'); return true; } if (!equalArrayBuffers(existing, publicKey)) { window.log.info("isTrustedForSending: Identity keys don't match..."); return false; } if (identityRecord.verified === VerifiedStatus.UNVERIFIED) { window.log.error('Needs unverified approval!'); return false; } if (this.isNonBlockingApprovalRequired(identityRecord)) { window.log.error('isTrustedForSending: Needs non-blocking approval!'); return false; } return true; }, async loadIdentityKey(identifier) { if (identifier === null || identifier === undefined) { throw new Error('Tried to get identity key for undefined/null key'); } const number = textsecure.utils.unencodeNumber(identifier)[0]; const identityRecord = this.identityKeys[number]; if (identityRecord) { return identityRecord.publicKey; } return undefined; }, async _saveIdentityKey(data) { const { id } = data; this.identityKeys[id] = data; await window.Signal.Data.createOrUpdateIdentityKey(data); }, async saveIdentity(identifier, publicKey, nonblockingApproval) { if (identifier === null || identifier === undefined) { throw new Error('Tried to put identity key for undefined/null key'); } if (!(publicKey instanceof ArrayBuffer)) { // eslint-disable-next-line no-param-reassign publicKey = convertToArrayBuffer(publicKey); } if (typeof nonblockingApproval !== 'boolean') { // eslint-disable-next-line no-param-reassign nonblockingApproval = false; } const number = textsecure.utils.unencodeNumber(identifier)[0]; const identityRecord = this.identityKeys[number]; if (!identityRecord || !identityRecord.publicKey) { // Lookup failed, or the current key was removed, so save this one. window.log.info('Saving new identity...'); await this._saveIdentityKey({ id: number, publicKey, firstUse: true, timestamp: Date.now(), verified: VerifiedStatus.DEFAULT, nonblockingApproval, }); return false; } const oldpublicKey = identityRecord.publicKey; if (!equalArrayBuffers(oldpublicKey, publicKey)) { window.log.info('Replacing existing identity...'); const previousStatus = identityRecord.verified; let verifiedStatus; if ( previousStatus === VerifiedStatus.VERIFIED || previousStatus === VerifiedStatus.UNVERIFIED ) { verifiedStatus = VerifiedStatus.UNVERIFIED; } else { verifiedStatus = VerifiedStatus.DEFAULT; } await this._saveIdentityKey({ id: number, publicKey, firstUse: false, timestamp: Date.now(), verified: verifiedStatus, nonblockingApproval, }); try { this.trigger('keychange', number); } catch (error) { window.log.error( 'saveIdentity error triggering keychange:', error && error.stack ? error.stack : error ); } await this.archiveSiblingSessions(identifier); return true; } else if (this.isNonBlockingApprovalRequired(identityRecord)) { window.log.info('Setting approval status...'); identityRecord.nonblockingApproval = nonblockingApproval; await this._saveIdentityKey(identityRecord); return false; } return false; }, isNonBlockingApprovalRequired(identityRecord) { return ( !identityRecord.firstUse && Date.now() - identityRecord.timestamp < TIMESTAMP_THRESHOLD && !identityRecord.nonblockingApproval ); }, async saveIdentityWithAttributes(identifier, attributes) { if (identifier === null || identifier === undefined) { throw new Error('Tried to put identity key for undefined/null key'); } const number = textsecure.utils.unencodeNumber(identifier)[0]; const identityRecord = this.identityKeys[number]; const updates = { id: number, ...identityRecord, ...attributes, }; const model = new IdentityRecord(updates); if (model.isValid()) { await this._saveIdentityKey(updates); } else { throw model.validationError; } }, async setApproval(identifier, nonblockingApproval) { if (identifier === null || identifier === undefined) { throw new Error('Tried to set approval for undefined/null identifier'); } if (typeof nonblockingApproval !== 'boolean') { throw new Error('Invalid approval status'); } const number = textsecure.utils.unencodeNumber(identifier)[0]; const identityRecord = this.identityKeys[number]; if (!identityRecord) { throw new Error(`No identity record for ${number}`); } identityRecord.nonblockingApproval = nonblockingApproval; await this._saveIdentityKey(identityRecord); }, async setVerified(number, verifiedStatus, publicKey) { if (number === null || number === undefined) { throw new Error('Tried to set verified for undefined/null key'); } if (!validateVerifiedStatus(verifiedStatus)) { throw new Error('Invalid verified status'); } if (arguments.length > 2 && !(publicKey instanceof ArrayBuffer)) { throw new Error('Invalid public key'); } const identityRecord = this.identityKeys[number]; if (!identityRecord) { throw new Error(`No identity record for ${number}`); } if ( !publicKey || equalArrayBuffers(identityRecord.publicKey, publicKey) ) { identityRecord.verified = verifiedStatus; const model = new IdentityRecord(identityRecord); if (model.isValid()) { await this._saveIdentityKey(identityRecord); } else { throw identityRecord.validationError; } } else { window.log.info('No identity record for specified publicKey'); } }, async getVerified(number) { if (number === null || number === undefined) { throw new Error('Tried to set verified for undefined/null key'); } const identityRecord = this.identityKeys[number]; if (!identityRecord) { throw new Error(`No identity record for ${number}`); } const verifiedStatus = identityRecord.verified; if (validateVerifiedStatus(verifiedStatus)) { return verifiedStatus; } return VerifiedStatus.DEFAULT; }, // Resolves to true if a new identity key was saved processContactSyncVerificationState(identifier, verifiedStatus, publicKey) { if (verifiedStatus === VerifiedStatus.UNVERIFIED) { return this.processUnverifiedMessage( identifier, verifiedStatus, publicKey ); } return this.processVerifiedMessage(identifier, verifiedStatus, publicKey); }, // This function encapsulates the non-Java behavior, since the mobile apps don't // currently receive contact syncs and therefore will see a verify sync with // UNVERIFIED status async processUnverifiedMessage(number, verifiedStatus, publicKey) { if (number === null || number === undefined) { throw new Error('Tried to set verified for undefined/null key'); } if (publicKey !== undefined && !(publicKey instanceof ArrayBuffer)) { throw new Error('Invalid public key'); } const identityRecord = this.identityKeys[number]; const isPresent = Boolean(identityRecord); let isEqual = false; if (isPresent && publicKey) { isEqual = equalArrayBuffers(publicKey, identityRecord.publicKey); } if ( isPresent && isEqual && identityRecord.verified !== VerifiedStatus.UNVERIFIED ) { await textsecure.storage.protocol.setVerified( number, verifiedStatus, publicKey ); return false; } if (!isPresent || !isEqual) { await textsecure.storage.protocol.saveIdentityWithAttributes(number, { publicKey, verified: verifiedStatus, firstUse: false, timestamp: Date.now(), nonblockingApproval: true, }); if (isPresent && !isEqual) { try { this.trigger('keychange', number); } catch (error) { window.log.error( 'processUnverifiedMessage error triggering keychange:', error && error.stack ? error.stack : error ); } await this.archiveAllSessions(number); return true; } } // The situation which could get us here is: // 1. had a previous key // 2. new key is the same // 3. desired new status is same as what we had before return false; }, // This matches the Java method as of // https://github.com/signalapp/Signal-Android/blob/d0bb68e1378f689e4d10ac6a46014164992ca4e4/src/org/thoughtcrime/securesms/util/IdentityUtil.java#L188 async processVerifiedMessage(number, verifiedStatus, publicKey) { if (number === null || number === undefined) { throw new Error('Tried to set verified for undefined/null key'); } if (!validateVerifiedStatus(verifiedStatus)) { throw new Error('Invalid verified status'); } if (publicKey !== undefined && !(publicKey instanceof ArrayBuffer)) { throw new Error('Invalid public key'); } const identityRecord = this.identityKeys[number]; const isPresent = Boolean(identityRecord); let isEqual = false; if (isPresent && publicKey) { isEqual = equalArrayBuffers(publicKey, identityRecord.publicKey); } if (!isPresent && verifiedStatus === VerifiedStatus.DEFAULT) { window.log.info('No existing record for default status'); return false; } if ( isPresent && isEqual && identityRecord.verified !== VerifiedStatus.DEFAULT && verifiedStatus === VerifiedStatus.DEFAULT ) { await textsecure.storage.protocol.setVerified( number, verifiedStatus, publicKey ); return false; } if ( verifiedStatus === VerifiedStatus.VERIFIED && (!isPresent || (isPresent && !isEqual) || (isPresent && identityRecord.verified !== VerifiedStatus.VERIFIED)) ) { await textsecure.storage.protocol.saveIdentityWithAttributes(number, { publicKey, verified: verifiedStatus, firstUse: false, timestamp: Date.now(), nonblockingApproval: true, }); if (isPresent && !isEqual) { try { this.trigger('keychange', number); } catch (error) { window.log.error( 'processVerifiedMessage error triggering keychange:', error && error.stack ? error.stack : error ); } await this.archiveAllSessions(number); // true signifies that we overwrote a previous key with a new one return true; } } // We get here if we got a new key and the status is DEFAULT. If the // message is out of date, we don't want to lose whatever more-secure // state we had before. return false; }, async isUntrusted(number) { if (number === null || number === undefined) { throw new Error('Tried to set verified for undefined/null key'); } const identityRecord = this.identityKeys[number]; if (!identityRecord) { throw new Error(`No identity record for ${number}`); } if ( Date.now() - identityRecord.timestamp < TIMESTAMP_THRESHOLD && !identityRecord.nonblockingApproval && !identityRecord.firstUse ) { return true; } return false; }, async removeIdentityKey(number) { delete this.identityKeys[number]; await window.Signal.Data.removeIdentityKeyById(number); await textsecure.storage.protocol.removeAllSessions(number); }, // Not yet processed messages - for resiliency getUnprocessedCount() { return window.Signal.Data.getUnprocessedCount(); }, getAllUnprocessed() { return window.Signal.Data.getAllUnprocessed(); }, getUnprocessedById(id) { return window.Signal.Data.getUnprocessedById(id); }, addUnprocessed(data) { // We need to pass forceSave because the data has an id already, which will cause // an update instead of an insert. return window.Signal.Data.saveUnprocessed(data, { forceSave: true, }); }, updateUnprocessedAttempts(id, attempts) { return window.Signal.Data.updateUnprocessedAttempts(id, attempts); }, updateUnprocessedWithData(id, data) { return window.Signal.Data.updateUnprocessedWithData(id, data); }, removeUnprocessed(id) { return window.Signal.Data.removeUnprocessed(id); }, removeAllUnprocessed() { return window.Signal.Data.removeAllUnprocessed(); }, async removeAllData() { await window.Signal.Data.removeAll(); await this.hydrateCaches(); window.storage.reset(); await window.storage.fetch(); ConversationController.reset(); BlockedNumberController.reset(); await ConversationController.load(); await BlockedNumberController.load(); }, async removeAllConfiguration() { await window.Signal.Data.removeAllConfiguration(); await this.hydrateCaches(); window.storage.reset(); await window.storage.fetch(); }, }; _.extend(SignalProtocolStore.prototype, Backbone.Events); window.SignalProtocolStore = SignalProtocolStore; window.SignalProtocolStore.prototype.Direction = Direction; window.SignalProtocolStore.prototype.VerifiedStatus = VerifiedStatus; })();