/* global libsignal */
import concat from 'lodash-es/concat';
import difference from 'lodash-es/difference';
import log from '@converse/headless/log';
import tplAudio from 'templates/audio.js';
import tplFile from 'templates/file.js';
import tplImage from 'templates/image.js';
import tplVideo from 'templates/video.js';
import { KEY_ALGO, UNTRUSTED, TAG_LENGTH } from './consts.js';
import { MIMETYPES_MAP } from 'utils/file.js';
import { __ } from 'i18n';
import { _converse, converse, api } from '@converse/headless/core';
import { html } from 'lit';
import { initStorage } from '@converse/headless/utils/storage.js';
import { isError } from '@converse/headless/utils/core.js';
import { isAudioURL, isImageURL, isVideoURL, getURI } from '@converse/headless/utils/url.js';
import { until } from 'lit/directives/until.js';
import {
appendArrayBuffer,
arrayBufferToBase64,
arrayBufferToHex,
arrayBufferToString,
base64ToArrayBuffer,
hexToArrayBuffer,
stringToArrayBuffer
} from '@converse/headless/utils/arraybuffer.js';
const { Strophe, URI, sizzle, u } = converse.env;
export function formatFingerprint (fp) {
fp = fp.replace(/^05/, '');
for (let i=1; i<8; i++) {
const idx = i*8+i-1;
fp = fp.slice(0, idx) + ' ' + fp.slice(idx);
}
return fp;
}
export function handleMessageSendError (e, chat) {
if (e.name === 'IQError') {
chat.save('omemo_supported', false);
const err_msgs = [];
if (sizzle(`presence-subscription-required[xmlns="${Strophe.NS.PUBSUB_ERROR}"]`, e.iq).length) {
err_msgs.push(
__(
"Sorry, we're unable to send an encrypted message because %1$s " +
'requires you to be subscribed to their presence in order to see their OMEMO information',
e.iq.getAttribute('from')
)
);
} else if (sizzle(`remote-server-not-found[xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"]`, e.iq).length) {
err_msgs.push(
__(
"Sorry, we're unable to send an encrypted message because the remote server for %1$s could not be found",
e.iq.getAttribute('from')
)
);
} else {
err_msgs.push(__('Unable to send an encrypted message due to an unexpected error.'));
err_msgs.push(e.iq.outerHTML);
}
api.alert('error', __('Error'), err_msgs);
} else if (e.user_facing) {
api.alert('error', __('Error'), [e.message]);
}
throw e;
}
export function getOutgoingMessageAttributes (chat, attrs) {
if (chat.get('omemo_active') && attrs.body) {
attrs['is_encrypted'] = true;
attrs['plaintext'] = attrs.body;
attrs['body'] = __(
'This is an OMEMO encrypted message which your client doesn’t seem to support. ' +
'Find more information on https://conversations.im/omemo'
);
}
return attrs;
}
async function encryptMessage (plaintext) {
// The client MUST use fresh, randomly generated key/IV pairs
// with AES-128 in Galois/Counter Mode (GCM).
// For GCM a 12 byte IV is strongly suggested as other IV lengths
// will require additional calculations. In principle any IV size
// can be used as long as the IV doesn't ever repeat. NIST however
// suggests that only an IV size of 12 bytes needs to be supported
// by implementations.
//
// https://crypto.stackexchange.com/questions/26783/ciphertext-and-tag-size-and-iv-transmission-with-aes-in-gcm-mode
const iv = crypto.getRandomValues(new window.Uint8Array(12));
const key = await crypto.subtle.generateKey(KEY_ALGO, true, ['encrypt', 'decrypt']);
const algo = {
'name': 'AES-GCM',
'iv': iv,
'tagLength': TAG_LENGTH
};
const encrypted = await crypto.subtle.encrypt(algo, key, stringToArrayBuffer(plaintext));
const length = encrypted.byteLength - ((128 + 7) >> 3);
const ciphertext = encrypted.slice(0, length);
const tag = encrypted.slice(length);
const exported_key = await crypto.subtle.exportKey('raw', key);
return {
'key': exported_key,
'tag': tag,
'key_and_tag': appendArrayBuffer(exported_key, tag),
'payload': arrayBufferToBase64(ciphertext),
'iv': arrayBufferToBase64(iv)
};
}
async function decryptMessage (obj) {
const key_obj = await crypto.subtle.importKey('raw', obj.key, KEY_ALGO, true, ['encrypt', 'decrypt']);
const cipher = appendArrayBuffer(base64ToArrayBuffer(obj.payload), obj.tag);
const algo = {
'name': 'AES-GCM',
'iv': base64ToArrayBuffer(obj.iv),
'tagLength': TAG_LENGTH
};
return arrayBufferToString(await crypto.subtle.decrypt(algo, key_obj, cipher));
}
export async function encryptFile (file) {
const iv = crypto.getRandomValues(new Uint8Array(12));
const key = await crypto.subtle.generateKey({ name: 'AES-GCM', length: 256, }, true, ['encrypt', 'decrypt']);
const encrypted = await crypto.subtle.encrypt({ name: 'AES-GCM', iv, }, key, await file.arrayBuffer());
const exported_key = await window.crypto.subtle.exportKey('raw', key);
const encrypted_file = new File([encrypted], file.name, { type: file.type, lastModified: file.lastModified });
encrypted_file.xep454_ivkey = arrayBufferToHex(iv) + arrayBufferToHex(exported_key);
return encrypted_file;
}
export function setEncryptedFileURL (message, attrs) {
const url = attrs.oob_url.replace(/^https?:/, 'aesgcm:') + '#' + message.file.xep454_ivkey;
return Object.assign(attrs, {
'oob_url': null, // Since only the body gets encrypted, we don't set the oob_url
'message': url,
'body': url
});
}
async function decryptFile (iv, key, cipher) {
const key_obj = await crypto.subtle.importKey('raw', hexToArrayBuffer(key), 'AES-GCM', false, ['decrypt']);
const algo = {
'name': 'AES-GCM',
'iv': hexToArrayBuffer(iv),
};
return crypto.subtle.decrypt(algo, key_obj, cipher);
}
async function downloadFile(url) {
let response;
try {
response = await fetch(url)
} catch(e) {
log.error(`${e.name}: Failed to download encrypted media: ${url}`);
log.error(e);
return null;
}
if (response.status >= 200 && response.status < 400) {
return response.arrayBuffer();
}
}
async function getAndDecryptFile (uri) {
const protocol = (window.location.hostname === 'localhost' && uri.domain() === 'localhost') ? 'http' : 'https';
const http_url = uri.toString().replace(/^aesgcm/, protocol);
const cipher = await downloadFile(http_url);
if (cipher === null) {
log.error(`Could not decrypt a received encrypted file ${uri.toString()} since it could not be downloaded`);
return new Error(__('Error: could not decrypt a received encrypted file, because it could not be downloaded'));
}
const hash = uri.hash().slice(1);
const key = hash.substring(hash.length-64);
const iv = hash.replace(key, '');
let content;
try {
content = await decryptFile(iv, key, cipher);
} catch (e) {
log.error(`Could not decrypt file ${uri.toString()}`);
log.error(e);
return null;
}
const [filename, extension] = uri.filename().split('.');
const mimetype = MIMETYPES_MAP[extension];
try {
const file = new File([content], filename, { 'type': mimetype });
return URL.createObjectURL(file);
} catch (e) {
log.error(`Could not decrypt file ${uri.toString()}`);
log.error(e);
return null;
}
}
function getTemplateForObjectURL (uri, obj_url, richtext) {
if (isError(obj_url)) {
return html`<p class="error">${obj_url.message}</p>`;
}
const file_url = uri.toString();
if (isImageURL(file_url)) {
return tplImage({
'src': obj_url,
'onClick': richtext.onImgClick,
'onLoad': richtext.onImgLoad
});
} else if (isAudioURL(file_url)) {
return tplAudio(obj_url);
} else if (isVideoURL(file_url)) {
return tplVideo(obj_url);
} else {
return tplFile(obj_url, uri.filename());
}
}
function addEncryptedFiles(text, offset, richtext) {
const objs = [];
try {
const parse_options = { 'start': /\b(aesgcm:\/\/)/gi };
URI.withinString(
text,
(url, start, end) => {
objs.push({ url, start, end });
return url;
},
parse_options
);
} catch (error) {
log.debug(error);
return;
}
objs.forEach(o => {
const uri = getURI(text.slice(o.start, o.end));
const promise = getAndDecryptFile(uri)
.then(obj_url => getTemplateForObjectURL(uri, obj_url, richtext));
const template = html`${until(promise, '')}`;
richtext.addTemplateResult(o.start + offset, o.end + offset, template);
});
}
export function handleEncryptedFiles (richtext) {
if (!_converse.config.get('trusted')) {
return;
}
richtext.addAnnotations((text, offset) => addEncryptedFiles(text, offset, richtext));
}
/**
* Hook handler for { @link parseMessage } and { @link parseMUCMessage }, which
* parses the passed in `message` stanza for OMEMO attributes and then sets
* them on the attrs object.
* @param { Element } stanza - The message stanza
* @param { (MUCMessageAttributes|MessageAttributes) } attrs
* @returns (MUCMessageAttributes|MessageAttributes)
*/
export async function parseEncryptedMessage (stanza, attrs) {
if (api.settings.get('clear_cache_on_logout') ||
!attrs.is_encrypted ||
attrs.encryption_namespace !== Strophe.NS.OMEMO) {
return attrs;
}
const encrypted_el = sizzle(`encrypted[xmlns="${Strophe.NS.OMEMO}"]`, stanza).pop();
const header = encrypted_el.querySelector('header');
attrs.encrypted = { 'device_id': header.getAttribute('sid') };
const device_id = await api.omemo?.getDeviceID();
const key = device_id && sizzle(`key[rid="${device_id}"]`, encrypted_el).pop();
if (key) {
Object.assign(attrs.encrypted, {
'iv': header.querySelector('iv').textContent,
'key': key.textContent,
'payload': encrypted_el.querySelector('payload')?.textContent || null,
'prekey': ['true', '1'].includes(key.getAttribute('prekey'))
});
} else {
return Object.assign(attrs, {
'error_condition': 'not-encrypted-for-this-device',
'error_type': 'Decryption',
'is_ephemeral': true,
'is_error': true,
'type': 'error'
});
}
// https://xmpp.org/extensions/xep-0384.html#usecases-receiving
if (attrs.encrypted.prekey === true) {
return decryptPrekeyWhisperMessage(attrs);
} else {
return decryptWhisperMessage(attrs);
}
}
export function onChatBoxesInitialized () {
_converse.chatboxes.on('add', chatbox => {
checkOMEMOSupported(chatbox);
if (chatbox.get('type') === _converse.CHATROOMS_TYPE) {
chatbox.occupants.on('add', o => onOccupantAdded(chatbox, o));
chatbox.features.on('change', () => checkOMEMOSupported(chatbox));
}
});
}
export function onChatInitialized (el) {
el.listenTo(el.model.messages, 'add', message => {
if (message.get('is_encrypted') && !message.get('is_error')) {
el.model.save('omemo_supported', true);
}
});
el.listenTo(el.model, 'change:omemo_supported', () => {
if (!el.model.get('omemo_supported') && el.model.get('omemo_active')) {
el.model.set('omemo_active', false);
} else {
// Manually trigger an update, setting omemo_active to
// false above will automatically trigger one.
el.querySelector('converse-chat-toolbar')?.requestUpdate();
}
});
el.listenTo(el.model, 'change:omemo_active', () => {
el.querySelector('converse-chat-toolbar').requestUpdate();
});
}
export function getSessionCipher (jid, id) {
const address = new libsignal.SignalProtocolAddress(jid, id);
return new window.libsignal.SessionCipher(_converse.omemo_store, address);
}
function getJIDForDecryption (attrs) {
const from_jid = attrs.from_muc ? attrs.from_real_jid : attrs.from;
if (!from_jid) {
Object.assign(attrs, {
'error_text': __("Sorry, could not decrypt a received OMEMO "+
"message because we don't have the XMPP address for that user."),
'error_type': 'Decryption',
'is_ephemeral': true,
'is_error': true,
'type': 'error'
});
throw new Error("Could not find JID to decrypt OMEMO message for");
}
return from_jid;
}
async function handleDecryptedWhisperMessage (attrs, key_and_tag) {
const from_jid = getJIDForDecryption(attrs);
const devicelist = await api.omemo.devicelists.get(from_jid, true);
const encrypted = attrs.encrypted;
let device = devicelist.devices.get(encrypted.device_id);
if (!device) {
device = await devicelist.devices.create({ 'id': encrypted.device_id, 'jid': from_jid }, { 'promise': true });
}
if (encrypted.payload) {
const key = key_and_tag.slice(0, 16);
const tag = key_and_tag.slice(16);
const result = await omemo.decryptMessage(Object.assign(encrypted, { 'key': key, 'tag': tag }));
device.save('active', true);
return result;
}
}
function getDecryptionErrorAttributes (e) {
return {
'error_text':
__('Sorry, could not decrypt a received OMEMO message due to an error.') + ` ${e.name} ${e.message}`,
'error_condition': e.name,
'error_message': e.message,
'error_type': 'Decryption',
'is_ephemeral': true,
'is_error': true,
'type': 'error'
};
}
async function decryptPrekeyWhisperMessage (attrs) {
const from_jid = getJIDForDecryption(attrs);
const session_cipher = getSessionCipher(from_jid, parseInt(attrs.encrypted.device_id, 10));
const key = base64ToArrayBuffer(attrs.encrypted.key);
let key_and_tag;
try {
key_and_tag = await session_cipher.decryptPreKeyWhisperMessage(key, 'binary');
} catch (e) {
// TODO from the XEP:
// There are various reasons why decryption of an
// OMEMOKeyExchange or an OMEMOAuthenticatedMessage
// could fail. One reason is if the message was
// received twice and already decrypted once, in this
// case the client MUST ignore the decryption failure
// and not show any warnings/errors. In all other cases
// of decryption failure, clients SHOULD respond by
// forcibly doing a new key exchange and sending a new
// OMEMOKeyExchange with a potentially empty SCE
// payload. By building a new session with the original
// sender this way, the invalid session of the original
// sender will get overwritten with this newly created,
// valid session.
log.error(`${e.name} ${e.message}`);
return Object.assign(attrs, getDecryptionErrorAttributes(e));
}
// TODO from the XEP:
// When a client receives the first message for a given
// ratchet key with a counter of 53 or higher, it MUST send
// a heartbeat message. Heartbeat messages are normal OMEMO
// encrypted messages where the SCE payload does not include
// any elements. These heartbeat messages cause the ratchet
// to forward, thus consequent messages will have the
// counter restarted from 0.
try {
const plaintext = await handleDecryptedWhisperMessage(attrs, key_and_tag);
await _converse.omemo_store.generateMissingPreKeys();
await _converse.omemo_store.publishBundle();
if (plaintext) {
return Object.assign(attrs, { 'plaintext': plaintext });
} else {
return Object.assign(attrs, { 'is_only_key': true });
}
} catch (e) {
log.error(`${e.name} ${e.message}`);
return Object.assign(attrs, getDecryptionErrorAttributes(e));
}
}
async function decryptWhisperMessage (attrs) {
const from_jid = getJIDForDecryption(attrs);
const session_cipher = getSessionCipher(from_jid, parseInt(attrs.encrypted.device_id, 10));
const key = base64ToArrayBuffer(attrs.encrypted.key);
try {
const key_and_tag = await session_cipher.decryptWhisperMessage(key, 'binary');
const plaintext = await handleDecryptedWhisperMessage(attrs, key_and_tag);
return Object.assign(attrs, { 'plaintext': plaintext });
} catch (e) {
log.error(`${e.name} ${e.message}`);
return Object.assign(attrs, getDecryptionErrorAttributes(e));
}
}
export function addKeysToMessageStanza (stanza, dicts, iv) {
for (const i in dicts) {
if (Object.prototype.hasOwnProperty.call(dicts, i)) {
const payload = dicts[i].payload;
const device = dicts[i].device;
const prekey = 3 == parseInt(payload.type, 10);
stanza.c('key', { 'rid': device.get('id') }).t(btoa(payload.body));
if (prekey) {
stanza.attrs({ 'prekey': prekey });
}
stanza.up();
if (i == dicts.length - 1) {
stanza.c('iv').t(iv).up().up();
}
}
}
return Promise.resolve(stanza);
}
/**
* Given an XML element representing a user's OMEMO bundle, parse it
* and return a map.
*/
export function parseBundle (bundle_el) {
const signed_prekey_public_el = bundle_el.querySelector('signedPreKeyPublic');
const signed_prekey_signature_el = bundle_el.querySelector('signedPreKeySignature');
const prekeys = sizzle(`prekeys > preKeyPublic`, bundle_el).map(el => ({
'id': parseInt(el.getAttribute('preKeyId'), 10),
'key': el.textContent
}));
return {
'identity_key': bundle_el.querySelector('identityKey').textContent.trim(),
'signed_prekey': {
'id': parseInt(signed_prekey_public_el.getAttribute('signedPreKeyId'), 10),
'public_key': signed_prekey_public_el.textContent,
'signature': signed_prekey_signature_el.textContent
},
'prekeys': prekeys
};
}
export async function generateFingerprint (device) {
if (device.get('bundle')?.fingerprint) {
return;
}
const bundle = await device.getBundle();
bundle['fingerprint'] = arrayBufferToHex(base64ToArrayBuffer(bundle['identity_key']));
device.save('bundle', bundle);
device.trigger('change:bundle'); // Doesn't get triggered automatically due to pass-by-reference
}
export async function getDevicesForContact (jid) {
await api.waitUntil('OMEMOInitialized');
const devicelist = await api.omemo.devicelists.get(jid, true);
await devicelist.fetchDevices();
return devicelist.devices;
}
export async function generateDeviceID () {
/* Generates a device ID, making sure that it's unique */
const devicelist = await api.omemo.devicelists.get(_converse.bare_jid, true);
const existing_ids = devicelist.devices.pluck('id');
let device_id = libsignal.KeyHelper.generateRegistrationId();
// Before publishing a freshly generated device id for the first time,
// a device MUST check whether that device id already exists, and if so, generate a new one.
let i = 0;
while (existing_ids.includes(device_id)) {
device_id = libsignal.KeyHelper.generateRegistrationId();
i++;
if (i === 10) {
throw new Error('Unable to generate a unique device ID');
}
}
return device_id.toString();
}
async function buildSession (device) {
const address = new libsignal.SignalProtocolAddress(device.get('jid'), device.get('id'));
const sessionBuilder = new libsignal.SessionBuilder(_converse.omemo_store, address);
const prekey = device.getRandomPreKey();
const bundle = await device.getBundle();
return sessionBuilder.processPreKey({
'registrationId': parseInt(device.get('id'), 10),
'identityKey': base64ToArrayBuffer(bundle.identity_key),
'signedPreKey': {
'keyId': bundle.signed_prekey.id, // <Number>
'publicKey': base64ToArrayBuffer(bundle.signed_prekey.public_key),
'signature': base64ToArrayBuffer(bundle.signed_prekey.signature)
},
'preKey': {
'keyId': prekey.id, // <Number>
'publicKey': base64ToArrayBuffer(prekey.key)
}
});
}
export async function getSession (device) {
if (!device.get('bundle')) {
log.error(`Could not build an OMEMO session for device ${device.get('id')} because we don't have its bundle`);
return null;
}
const address = new libsignal.SignalProtocolAddress(device.get('jid'), device.get('id'));
const session = await _converse.omemo_store.loadSession(address.toString());
if (session) {
return session;
} else {
try {
const session = await buildSession(device);
return session;
} catch (e) {
log.error(`Could not build an OMEMO session for device ${device.get('id')}`);
log.error(e);
return null;
}
}
}
async function updateBundleFromStanza (stanza) {
const items_el = sizzle(`items`, stanza).pop();
if (!items_el || !items_el.getAttribute('node').startsWith(Strophe.NS.OMEMO_BUNDLES)) {
return;
}
const device_id = items_el.getAttribute('node').split(':')[1];
const jid = stanza.getAttribute('from');
const bundle_el = sizzle(`item > bundle`, items_el).pop();
const devicelist = await api.omemo.devicelists.get(jid, true);
const device = devicelist.devices.get(device_id) || devicelist.devices.create({ 'id': device_id, jid });
device.save({ 'bundle': parseBundle(bundle_el) });
}
async function updateDevicesFromStanza (stanza) {
const items_el = sizzle(`items[node="${Strophe.NS.OMEMO_DEVICELIST}"]`, stanza).pop();
if (!items_el) {
return;
}
const device_selector = `item list[xmlns="${Strophe.NS.OMEMO}"] device`;
const device_ids = sizzle(device_selector, items_el).map(d => d.getAttribute('id'));
const jid = stanza.getAttribute('from');
const devicelist = await api.omemo.devicelists.get(jid, true);
const devices = devicelist.devices;
const removed_ids = difference(devices.pluck('id'), device_ids);
removed_ids.forEach(id => {
if (jid === _converse.bare_jid && id === _converse.omemo_store.get('device_id')) {
return; // We don't set the current device as inactive
}
devices.get(id).save('active', false);
});
device_ids.forEach(device_id => {
const device = devices.get(device_id);
if (device) {
device.save('active', true);
} else {
devices.create({ 'id': device_id, 'jid': jid });
}
});
if (u.isSameBareJID(jid, _converse.bare_jid)) {
// Make sure our own device is on the list
// (i.e. if it was removed, add it again).
devicelist.publishCurrentDevice(device_ids);
}
}
export function registerPEPPushHandler () {
// Add a handler for devices pushed from other connected clients
_converse.connection.addHandler(
async (message) => {
try {
if (sizzle(`event[xmlns="${Strophe.NS.PUBSUB}#event"]`, message).length) {
await api.waitUntil('OMEMOInitialized');
await updateDevicesFromStanza(message);
await updateBundleFromStanza(message);
}
} catch (e) {
log.error(e.message);
}
return true;
},
null,
'message',
'headline'
);
}
export async function restoreOMEMOSession () {
if (_converse.omemo_store === undefined) {
const id = `converse.omemosession-${_converse.bare_jid}`;
_converse.omemo_store = new _converse.OMEMOStore({ id });
initStorage(_converse.omemo_store, id);
}
await _converse.omemo_store.fetchSession();
}
async function fetchDeviceLists () {
_converse.devicelists = new _converse.DeviceLists();
const id = `converse.devicelists-${_converse.bare_jid}`;
initStorage(_converse.devicelists, id);
await new Promise(resolve => {
_converse.devicelists.fetch({
'success': resolve,
'error': (_m, e) => { log.error(e); resolve(); }
})
});
// Call API method to wait for our own device list to be fetched from the
// server or to be created. If we have no pre-existing OMEMO session, this
// will cause a new device and bundle to be generated and published.
await api.omemo.devicelists.get(_converse.bare_jid, true);
}
export async function initOMEMO (reconnecting) {
if (reconnecting) {
return;
}
if (!_converse.config.get('trusted') || api.settings.get('clear_cache_on_logout')) {
log.warn('Not initializing OMEMO, since this browser is not trusted or clear_cache_on_logout is set to true');
return;
}
try {
await fetchDeviceLists();
await restoreOMEMOSession();
await _converse.omemo_store.publishBundle();
} catch (e) {
log.error('Could not initialize OMEMO support');
log.error(e);
return;
}
/**
* Triggered once OMEMO support has been initialized
* @event _converse#OMEMOInitialized
* @example _converse.api.listen.on('OMEMOInitialized', () => { ... });
*/
api.trigger('OMEMOInitialized');
}
async function onOccupantAdded (chatroom, occupant) {
if (occupant.isSelf() || !chatroom.features.get('nonanonymous') || !chatroom.features.get('membersonly')) {
return;
}
if (chatroom.get('omemo_active')) {
const supported = await _converse.contactHasOMEMOSupport(occupant.get('jid'));
if (!supported) {
chatroom.createMessage({
'message': __(
"%1$s doesn't appear to have a client that supports OMEMO. " +
'Encrypted chat will no longer be possible in this grouchat.',
occupant.get('nick')
),
'type': 'error'
});
chatroom.save({ 'omemo_active': false, 'omemo_supported': false });
}
}
}
async function checkOMEMOSupported (chatbox) {
let supported;
if (chatbox.get('type') === _converse.CHATROOMS_TYPE) {
await api.waitUntil('OMEMOInitialized');
supported = chatbox.features.get('nonanonymous') && chatbox.features.get('membersonly');
} else if (chatbox.get('type') === _converse.PRIVATE_CHAT_TYPE) {
supported = await _converse.contactHasOMEMOSupport(chatbox.get('jid'));
}
chatbox.set('omemo_supported', supported);
if (supported && api.settings.get('omemo_default')) {
chatbox.set('omemo_active', true);
}
}
function toggleOMEMO (ev) {
ev.stopPropagation();
ev.preventDefault();
const toolbar_el = u.ancestor(ev.target, 'converse-chat-toolbar');
if (!toolbar_el.model.get('omemo_supported')) {
let messages;
if (toolbar_el.model.get('type') === _converse.CHATROOMS_TYPE) {
messages = [
__(
'Cannot use end-to-end encryption in this groupchat, ' +
'either the groupchat has some anonymity or not all participants support OMEMO.'
)
];
} else {
messages = [
__(
"Cannot use end-to-end encryption because %1$s uses a client that doesn't support OMEMO.",
toolbar_el.model.contact.getDisplayName()
)
];
}
return api.alert('error', __('Error'), messages);
}
toolbar_el.model.save({ 'omemo_active': !toolbar_el.model.get('omemo_active') });
}
export function getOMEMOToolbarButton (toolbar_el, buttons) {
const model = toolbar_el.model;
const is_muc = model.get('type') === _converse.CHATROOMS_TYPE;
let title;
if (model.get('omemo_supported')) {
const i18n_plaintext = __('Messages are being sent in plaintext');
const i18n_encrypted = __('Messages are sent encrypted');
title = model.get('omemo_active') ? i18n_encrypted : i18n_plaintext;
} else if (is_muc) {
title = __(
'This groupchat needs to be members-only and non-anonymous in ' +
'order to support OMEMO encrypted messages'
);
} else {
title = __('OMEMO encryption is not supported');
}
let color;
if (model.get('omemo_supported')) {
if (model.get('omemo_active')) {
color = is_muc ? `var(--muc-color)` : `var(--chat-toolbar-btn-color)`;
} else {
color = `var(--error-color)`;
}
} else {
color = `var(--muc-toolbar-btn-disabled-color)`;
}
buttons.push(html`
<button class="toggle-omemo" title="${title}" data-disabled=${!model.get('omemo_supported')} @click=${toggleOMEMO}>
<converse-icon
class="fa ${model.get('omemo_active') ? `fa-lock` : `fa-unlock`}"
path-prefix="${api.settings.get('assets_path')}"
size="1em"
color="${color}"
></converse-icon>
</button>
`);
return buttons;
}
async function getBundlesAndBuildSessions (chatbox) {
const no_devices_err = __('Sorry, no devices found to which we can send an OMEMO encrypted message.');
let devices;
if (chatbox.get('type') === _converse.CHATROOMS_TYPE) {
const collections = await Promise.all(chatbox.occupants.map(o => getDevicesForContact(o.get('jid'))));
devices = collections.reduce((a, b) => concat(a, b.models), []);
} else if (chatbox.get('type') === _converse.PRIVATE_CHAT_TYPE) {
const their_devices = await getDevicesForContact(chatbox.get('jid'));
if (their_devices.length === 0) {
const err = new Error(no_devices_err);
err.user_facing = true;
throw err;
}
const own_list = await api.omemo.devicelists.get(_converse.bare_jid)
const own_devices = own_list.devices;
devices = [...own_devices.models, ...their_devices.models];
}
// Filter out our own device
const id = _converse.omemo_store.get('device_id');
devices = devices.filter(d => d.get('id') !== id);
// Fetch bundles if necessary
await Promise.all(devices.map(d => d.getBundle()));
const sessions = devices.filter(d => d).map(d => getSession(d));
await Promise.all(sessions);
if (sessions.includes(null)) {
// We couldn't build a session for certain devices.
devices = devices.filter(d => sessions[devices.indexOf(d)]);
if (devices.length === 0) {
const err = new Error(no_devices_err);
err.user_facing = true;
throw err;
}
}
return devices;
}
function encryptKey (key_and_tag, device) {
return getSessionCipher(device.get('jid'), device.get('id'))
.encrypt(key_and_tag)
.then(payload => ({ 'payload': payload, 'device': device }));
}
export async function createOMEMOMessageStanza (chat, data) {
let { stanza } = data;
const { message } = data;
if (!message.get('is_encrypted')) {
return data;
}
if (!message.get('body')) {
throw new Error('No message body to encrypt!');
}
const devices = await getBundlesAndBuildSessions(chat);
// An encrypted header is added to the message for
// each device that is supposed to receive it.
// These headers simply contain the key that the
// payload message is encrypted with,
// and they are separately encrypted using the
// session corresponding to the counterpart device.
stanza.c('encrypted', { 'xmlns': Strophe.NS.OMEMO })
.c('header', { 'sid': _converse.omemo_store.get('device_id') });
const { key_and_tag, iv, payload } = await omemo.encryptMessage(message.get('plaintext'));
// The 16 bytes key and the GCM authentication tag (The tag
// SHOULD have at least 128 bit) are concatenated and for each
// intended recipient device, i.e. both own devices as well as
// devices associated with the contact, the result of this
// concatenation is encrypted using the corresponding
// long-standing SignalProtocol session.
const dicts = await Promise.all(devices
.filter(device => device.get('trusted') != UNTRUSTED && device.get('active'))
.map(device => encryptKey(key_and_tag, device)));
stanza = await addKeysToMessageStanza(stanza, dicts, iv);
stanza.c('payload').t(payload).up().up();
stanza.c('store', { 'xmlns': Strophe.NS.HINTS }).up();
stanza.c('encryption', { 'xmlns': Strophe.NS.EME, namespace: Strophe.NS.OMEMO });
return { message, stanza };
}
export const omemo = {
decryptMessage,
encryptMessage,
formatFingerprint
}