71fef439ed
Assign most signature subpacket types a criticality based on whether failing to interpret their meaning would negatively impact security. For Notation Data subpackets, let the user indicate their criticality using the `signatureNotations[*].critical` property.
428 lines
17 KiB
JavaScript
428 lines
17 KiB
JavaScript
/**
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* @fileoverview Provides helpers methods for key module
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* @module key/helper
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* @private
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*/
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import {
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PublicKeyPacket,
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PublicSubkeyPacket,
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SecretKeyPacket,
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SecretSubkeyPacket,
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SignaturePacket
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} from '../packet';
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import enums from '../enums';
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import crypto from '../crypto';
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import util from '../util';
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import defaultConfig from '../config';
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export async function generateSecretSubkey(options, config) {
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const secretSubkeyPacket = new SecretSubkeyPacket(options.date, config);
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secretSubkeyPacket.packets = null;
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secretSubkeyPacket.algorithm = enums.write(enums.publicKey, options.algorithm);
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await secretSubkeyPacket.generate(options.rsaBits, options.curve);
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await secretSubkeyPacket.computeFingerprintAndKeyID();
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return secretSubkeyPacket;
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}
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export async function generateSecretKey(options, config) {
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const secretKeyPacket = new SecretKeyPacket(options.date, config);
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secretKeyPacket.packets = null;
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secretKeyPacket.algorithm = enums.write(enums.publicKey, options.algorithm);
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await secretKeyPacket.generate(options.rsaBits, options.curve, options.config);
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await secretKeyPacket.computeFingerprintAndKeyID();
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return secretKeyPacket;
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}
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/**
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* Returns the valid and non-expired signature that has the latest creation date, while ignoring signatures created in the future.
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* @param {Array<SignaturePacket>} signatures - List of signatures
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* @param {PublicKeyPacket|PublicSubkeyPacket} publicKey - Public key packet to verify the signature
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* @param {Date} date - Use the given date instead of the current time
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* @param {Object} config - full configuration
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* @returns {Promise<SignaturePacket>} The latest valid signature.
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* @async
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*/
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export async function getLatestValidSignature(signatures, publicKey, signatureType, dataToVerify, date = new Date(), config) {
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let latestValid;
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let exception;
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for (let i = signatures.length - 1; i >= 0; i--) {
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try {
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if (
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(!latestValid || signatures[i].created >= latestValid.created)
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) {
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await signatures[i].verify(publicKey, signatureType, dataToVerify, date, undefined, config);
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latestValid = signatures[i];
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}
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} catch (e) {
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exception = e;
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}
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}
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if (!latestValid) {
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throw util.wrapError(
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`Could not find valid ${enums.read(enums.signature, signatureType)} signature in key ${publicKey.getKeyID().toHex()}`
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.replace('certGeneric ', 'self-')
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.replace(/([a-z])([A-Z])/g, (_, $1, $2) => $1 + ' ' + $2.toLowerCase())
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, exception);
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}
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return latestValid;
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}
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export function isDataExpired(keyPacket, signature, date = new Date()) {
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const normDate = util.normalizeDate(date);
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if (normDate !== null) {
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const expirationTime = getKeyExpirationTime(keyPacket, signature);
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return !(keyPacket.created <= normDate && normDate < expirationTime);
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}
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return false;
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}
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/**
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* Create Binding signature to the key according to the {@link https://tools.ietf.org/html/rfc4880#section-5.2.1}
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* @param {SecretSubkeyPacket} subkey - Subkey key packet
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* @param {SecretKeyPacket} primaryKey - Primary key packet
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* @param {Object} options
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* @param {Object} config - Full configuration
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*/
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export async function createBindingSignature(subkey, primaryKey, options, config) {
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const dataToSign = {};
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dataToSign.key = primaryKey;
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dataToSign.bind = subkey;
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const subkeySignaturePacket = new SignaturePacket();
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subkeySignaturePacket.signatureType = enums.signature.subkeyBinding;
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subkeySignaturePacket.publicKeyAlgorithm = primaryKey.algorithm;
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subkeySignaturePacket.hashAlgorithm = await getPreferredHashAlgo(null, subkey, undefined, undefined, config);
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if (options.sign) {
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subkeySignaturePacket.keyFlags = [enums.keyFlags.signData];
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subkeySignaturePacket.embeddedSignature = await createSignaturePacket(dataToSign, null, subkey, {
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signatureType: enums.signature.keyBinding
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}, options.date, undefined, undefined, undefined, config);
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} else {
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subkeySignaturePacket.keyFlags = [enums.keyFlags.encryptCommunication | enums.keyFlags.encryptStorage];
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}
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if (options.keyExpirationTime > 0) {
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subkeySignaturePacket.keyExpirationTime = options.keyExpirationTime;
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subkeySignaturePacket.keyNeverExpires = false;
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}
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await subkeySignaturePacket.sign(primaryKey, dataToSign, options.date);
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return subkeySignaturePacket;
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}
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/**
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* Returns the preferred signature hash algorithm of a key
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* @param {Key} [key] - The key to get preferences from
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* @param {SecretKeyPacket|SecretSubkeyPacket} keyPacket - key packet used for signing
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* @param {Date} [date] - Use the given date for verification instead of the current time
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* @param {Object} [userID] - User ID
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* @param {Object} config - full configuration
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* @returns {Promise<enums.hash>}
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* @async
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*/
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export async function getPreferredHashAlgo(key, keyPacket, date = new Date(), userID = {}, config) {
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let hashAlgo = config.preferredHashAlgorithm;
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let prefAlgo = hashAlgo;
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if (key) {
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const primaryUser = await key.getPrimaryUser(date, userID, config);
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if (primaryUser.selfCertification.preferredHashAlgorithms) {
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[prefAlgo] = primaryUser.selfCertification.preferredHashAlgorithms;
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hashAlgo = crypto.hash.getHashByteLength(hashAlgo) <= crypto.hash.getHashByteLength(prefAlgo) ?
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prefAlgo : hashAlgo;
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}
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}
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switch (Object.getPrototypeOf(keyPacket)) {
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case SecretKeyPacket.prototype:
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case PublicKeyPacket.prototype:
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case SecretSubkeyPacket.prototype:
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case PublicSubkeyPacket.prototype:
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switch (keyPacket.algorithm) {
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case enums.publicKey.ecdh:
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case enums.publicKey.ecdsa:
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case enums.publicKey.eddsa:
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prefAlgo = crypto.publicKey.elliptic.getPreferredHashAlgo(keyPacket.publicParams.oid);
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}
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}
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return crypto.hash.getHashByteLength(hashAlgo) <= crypto.hash.getHashByteLength(prefAlgo) ?
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prefAlgo : hashAlgo;
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}
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/**
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* Returns the preferred symmetric/aead/compression algorithm for a set of keys
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* @param {'symmetric'|'aead'|'compression'} type - Type of preference to return
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* @param {Array<Key>} [keys] - Set of keys
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* @param {Date} [date] - Use the given date for verification instead of the current time
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* @param {Array} [userIDs] - User IDs
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* @param {Object} [config] - Full configuration, defaults to openpgp.config
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* @returns {Promise<module:enums.symmetric|aead|compression>} Preferred algorithm
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* @async
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*/
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export async function getPreferredAlgo(type, keys = [], date = new Date(), userIDs = [], config = defaultConfig) {
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const defaultAlgo = { // these are all must-implement in rfc4880bis
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'symmetric': enums.symmetric.aes128,
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'aead': enums.aead.eax,
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'compression': enums.compression.uncompressed
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}[type];
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const preferredSenderAlgo = {
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'symmetric': config.preferredSymmetricAlgorithm,
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'aead': config.preferredAEADAlgorithm,
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'compression': config.preferredCompressionAlgorithm
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}[type];
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const prefPropertyName = {
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'symmetric': 'preferredSymmetricAlgorithms',
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'aead': 'preferredAEADAlgorithms',
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'compression': 'preferredCompressionAlgorithms'
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}[type];
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// if preferredSenderAlgo appears in the prefs of all recipients, we pick it
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// otherwise we use the default algo
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// if no keys are available, preferredSenderAlgo is returned
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const senderAlgoSupport = await Promise.all(keys.map(async function(key, i) {
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const primaryUser = await key.getPrimaryUser(date, userIDs[i], config);
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const recipientPrefs = primaryUser.selfCertification[prefPropertyName];
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return !!recipientPrefs && recipientPrefs.indexOf(preferredSenderAlgo) >= 0;
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}));
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return senderAlgoSupport.every(Boolean) ? preferredSenderAlgo : defaultAlgo;
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}
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/**
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* Create signature packet
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* @param {Object} dataToSign - Contains packets to be signed
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* @param {PrivateKey} privateKey - key to get preferences from
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* @param {SecretKeyPacket|
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* SecretSubkeyPacket} signingKeyPacket secret key packet for signing
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* @param {Object} [signatureProperties] - Properties to write on the signature packet before signing
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* @param {Date} [date] - Override the creationtime of the signature
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* @param {Object} [userID] - User ID
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* @param {Array} [notations] - Notation Data to add to the signature, e.g. [{ name: 'test@example.org', value: new TextEncoder().encode('test'), humanReadable: true, critical: false }]
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* @param {Object} [detached] - Whether to create a detached signature packet
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* @param {Object} config - full configuration
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* @returns {Promise<SignaturePacket>} Signature packet.
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*/
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export async function createSignaturePacket(dataToSign, privateKey, signingKeyPacket, signatureProperties, date, userID, notations = [], detached = false, config) {
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if (signingKeyPacket.isDummy()) {
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throw new Error('Cannot sign with a gnu-dummy key.');
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}
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if (!signingKeyPacket.isDecrypted()) {
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throw new Error('Signing key is not decrypted.');
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}
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const signaturePacket = new SignaturePacket();
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Object.assign(signaturePacket, signatureProperties);
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signaturePacket.publicKeyAlgorithm = signingKeyPacket.algorithm;
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signaturePacket.hashAlgorithm = await getPreferredHashAlgo(privateKey, signingKeyPacket, date, userID, config);
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signaturePacket.rawNotations = notations;
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await signaturePacket.sign(signingKeyPacket, dataToSign, date, detached);
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return signaturePacket;
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}
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/**
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* Merges signatures from source[attr] to dest[attr]
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* @param {Object} source
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* @param {Object} dest
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* @param {String} attr
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* @param {Date} [date] - date to use for signature expiration check, instead of the current time
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* @param {Function} [checkFn] - signature only merged if true
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*/
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export async function mergeSignatures(source, dest, attr, date = new Date(), checkFn) {
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source = source[attr];
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if (source) {
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if (!dest[attr].length) {
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dest[attr] = source;
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} else {
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await Promise.all(source.map(async function(sourceSig) {
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if (!sourceSig.isExpired(date) && (!checkFn || await checkFn(sourceSig)) &&
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!dest[attr].some(function(destSig) {
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return util.equalsUint8Array(destSig.writeParams(), sourceSig.writeParams());
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})) {
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dest[attr].push(sourceSig);
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}
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}));
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}
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}
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}
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/**
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* Checks if a given certificate or binding signature is revoked
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* @param {SecretKeyPacket|
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* PublicKeyPacket} primaryKey The primary key packet
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* @param {Object} dataToVerify - The data to check
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* @param {Array<SignaturePacket>} revocations - The revocation signatures to check
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* @param {SignaturePacket} signature - The certificate or signature to check
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* @param {PublicSubkeyPacket|
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* SecretSubkeyPacket|
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* PublicKeyPacket|
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* SecretKeyPacket} key, optional The key packet to verify the signature, instead of the primary key
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* @param {Date} date - Use the given date instead of the current time
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* @param {Object} config - Full configuration
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* @returns {Promise<Boolean>} True if the signature revokes the data.
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* @async
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*/
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export async function isDataRevoked(primaryKey, signatureType, dataToVerify, revocations, signature, key, date = new Date(), config) {
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key = key || primaryKey;
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const revocationKeyIDs = [];
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await Promise.all(revocations.map(async function(revocationSignature) {
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try {
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if (
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// Note: a third-party revocation signature could legitimately revoke a
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// self-signature if the signature has an authorized revocation key.
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// However, we don't support passing authorized revocation keys, nor
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// verifying such revocation signatures. Instead, we indicate an error
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// when parsing a key with an authorized revocation key, and ignore
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// third-party revocation signatures here. (It could also be revoking a
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// third-party key certification, which should only affect
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// `verifyAllCertifications`.)
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!signature || revocationSignature.issuerKeyID.equals(signature.issuerKeyID)
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) {
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await revocationSignature.verify(
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key, signatureType, dataToVerify, config.revocationsExpire ? date : null, false, config
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);
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// TODO get an identifier of the revoked object instead
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revocationKeyIDs.push(revocationSignature.issuerKeyID);
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}
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} catch (e) {}
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}));
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// TODO further verify that this is the signature that should be revoked
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if (signature) {
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signature.revoked = revocationKeyIDs.some(keyID => keyID.equals(signature.issuerKeyID)) ? true :
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signature.revoked || false;
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return signature.revoked;
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}
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return revocationKeyIDs.length > 0;
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}
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/**
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* Returns key expiration time based on the given certification signature.
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* The expiration time of the signature is ignored.
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* @param {PublicSubkeyPacket|PublicKeyPacket} keyPacket - key to check
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* @param {SignaturePacket} signature - signature to process
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* @returns {Date|Infinity} expiration time or infinity if the key does not expire
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*/
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export function getKeyExpirationTime(keyPacket, signature) {
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let expirationTime;
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// check V4 expiration time
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if (signature.keyNeverExpires === false) {
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expirationTime = keyPacket.created.getTime() + signature.keyExpirationTime * 1000;
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}
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return expirationTime ? new Date(expirationTime) : Infinity;
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}
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/**
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* Returns whether aead is supported by all keys in the set
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* @param {Array<Key>} keys - Set of keys
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* @param {Date} [date] - Use the given date for verification instead of the current time
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* @param {Array} [userIDs] - User IDs
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* @param {Object} config - full configuration
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* @returns {Promise<Boolean>}
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* @async
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*/
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export async function isAEADSupported(keys, date = new Date(), userIDs = [], config = defaultConfig) {
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let supported = true;
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// TODO replace when Promise.some or Promise.any are implemented
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await Promise.all(keys.map(async function(key, i) {
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const primaryUser = await key.getPrimaryUser(date, userIDs[i], config);
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if (!primaryUser.selfCertification.features ||
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!(primaryUser.selfCertification.features[0] & enums.features.aead)) {
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supported = false;
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}
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}));
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return supported;
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}
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export function sanitizeKeyOptions(options, subkeyDefaults = {}) {
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options.type = options.type || subkeyDefaults.type;
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options.curve = options.curve || subkeyDefaults.curve;
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options.rsaBits = options.rsaBits || subkeyDefaults.rsaBits;
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options.keyExpirationTime = options.keyExpirationTime !== undefined ? options.keyExpirationTime : subkeyDefaults.keyExpirationTime;
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options.passphrase = util.isString(options.passphrase) ? options.passphrase : subkeyDefaults.passphrase;
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options.date = options.date || subkeyDefaults.date;
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options.sign = options.sign || false;
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switch (options.type) {
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case 'ecc':
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try {
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options.curve = enums.write(enums.curve, options.curve);
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} catch (e) {
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throw new Error('Unknown curve');
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}
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if (options.curve === enums.curve.ed25519 || options.curve === enums.curve.curve25519) {
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options.curve = options.sign ? enums.curve.ed25519 : enums.curve.curve25519;
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}
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if (options.sign) {
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options.algorithm = options.curve === enums.curve.ed25519 ? enums.publicKey.eddsa : enums.publicKey.ecdsa;
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} else {
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options.algorithm = enums.publicKey.ecdh;
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}
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break;
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case 'rsa':
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options.algorithm = enums.publicKey.rsaEncryptSign;
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break;
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default:
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throw new Error(`Unsupported key type ${options.type}`);
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}
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return options;
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}
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export function isValidSigningKeyPacket(keyPacket, signature) {
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const keyAlgo = keyPacket.algorithm;
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return keyAlgo !== enums.publicKey.rsaEncrypt &&
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keyAlgo !== enums.publicKey.elgamal &&
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keyAlgo !== enums.publicKey.ecdh &&
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(!signature.keyFlags ||
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(signature.keyFlags[0] & enums.keyFlags.signData) !== 0);
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}
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export function isValidEncryptionKeyPacket(keyPacket, signature) {
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const keyAlgo = keyPacket.algorithm;
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return keyAlgo !== enums.publicKey.dsa &&
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keyAlgo !== enums.publicKey.rsaSign &&
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keyAlgo !== enums.publicKey.ecdsa &&
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keyAlgo !== enums.publicKey.eddsa &&
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(!signature.keyFlags ||
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(signature.keyFlags[0] & enums.keyFlags.encryptCommunication) !== 0 ||
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(signature.keyFlags[0] & enums.keyFlags.encryptStorage) !== 0);
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}
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export function isValidDecryptionKeyPacket(signature, config) {
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if (config.allowInsecureDecryptionWithSigningKeys) {
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// This is only relevant for RSA keys, all other signing algorithms cannot decrypt
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return true;
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}
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return !signature.keyFlags ||
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(signature.keyFlags[0] & enums.keyFlags.encryptCommunication) !== 0 ||
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(signature.keyFlags[0] & enums.keyFlags.encryptStorage) !== 0;
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}
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/**
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* Check key against blacklisted algorithms and minimum strength requirements.
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* @param {SecretKeyPacket|PublicKeyPacket|
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* SecretSubkeyPacket|PublicSubkeyPacket} keyPacket
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* @param {Config} config
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* @throws {Error} if the key packet does not meet the requirements
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*/
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export function checkKeyRequirements(keyPacket, config) {
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const keyAlgo = enums.write(enums.publicKey, keyPacket.algorithm);
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const algoInfo = keyPacket.getAlgorithmInfo();
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if (config.rejectPublicKeyAlgorithms.has(keyAlgo)) {
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throw new Error(`${algoInfo.algorithm} keys are considered too weak.`);
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}
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switch (keyAlgo) {
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case enums.publicKey.rsaEncryptSign:
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case enums.publicKey.rsaSign:
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case enums.publicKey.rsaEncrypt:
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if (algoInfo.bits < config.minRSABits) {
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throw new Error(`RSA keys shorter than ${config.minRSABits} bits are considered too weak.`);
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}
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break;
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case enums.publicKey.ecdsa:
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case enums.publicKey.eddsa:
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case enums.publicKey.ecdh:
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if (config.rejectCurves.has(algoInfo.curve)) {
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throw new Error(`Support for ${algoInfo.algorithm} keys using curve ${algoInfo.curve} is disabled.`);
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}
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break;
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default:
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break;
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}
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}
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