mirror of https://github.com/node-red/node-red.git
320 lines
12 KiB
JavaScript
320 lines
12 KiB
JavaScript
/**
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* Copyright 2014, 2016 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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var when = require("when");
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var crypto = require('crypto');
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var settings;
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var log;
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var encryptedCredentials = null;
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var credentialCache = {};
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var credentialsDef = {};
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var dirty = false;
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var removeDefaultKey = false;
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var encryptionEnabled = null;
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var encryptionAlgorithm = "aes-256-ctr";
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var encryptionKey;
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function decryptCredentials(key,credentials) {
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var creds = credentials["$"];
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var initVector = new Buffer(creds.substring(0, 32),'hex');
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creds = creds.substring(32);
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var decipher = crypto.createDecipheriv(encryptionAlgorithm, key, initVector);
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var decrypted = decipher.update(creds, 'base64', 'utf8') + decipher.final('utf8');
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return JSON.parse(decrypted);
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}
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var api = module.exports = {
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init: function(runtime) {
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log = runtime.log;
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settings = runtime.settings;
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dirty = false;
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credentialCache = {};
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credentialsDef = {};
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encryptionEnabled = null;
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},
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/**
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* Sets the credentials from storage.
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*/
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load: function (credentials) {
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dirty = false;
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/*
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- if encryptionEnabled === null, check the current configuration
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*/
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var credentialsEncrypted = credentials.hasOwnProperty("$") && Object.keys(credentials).length === 1;
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var setupEncryptionPromise = when.resolve();
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if (encryptionEnabled === null) {
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var defaultKey;
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try {
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defaultKey = settings.get('_credentialSecret');
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} catch(err) {
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}
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if (defaultKey) {
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defaultKey = crypto.createHash('sha256').update(defaultKey).digest();
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}
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var userKey;
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try {
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userKey = settings.get('credentialSecret');
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} catch(err) {
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userKey = false;
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}
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if (userKey === false) {
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log.debug("red/runtime/nodes/credentials.load : user disabled encryption");
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// User has disabled encryption
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encryptionEnabled = false;
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// Check if we have a generated _credSecret to decrypt with and remove
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if (defaultKey) {
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log.debug("red/runtime/nodes/credentials.load : default key present. Will migrate");
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if (credentialsEncrypted) {
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try {
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credentials = decryptCredentials(defaultKey,credentials)
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} catch(err) {
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credentials = {};
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log.warn(log._("nodes.credentials.error",{message:err.toString()}))
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}
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}
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dirty = true;
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removeDefaultKey = true;
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}
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} else if (typeof userKey === 'string') {
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log.debug("red/runtime/nodes/credentials.load : user provided key");
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// User has provided own encryption key, get the 32-byte hash of it
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encryptionKey = crypto.createHash('sha256').update(userKey).digest();
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encryptionEnabled = true;
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if (defaultKey) {
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log.debug("red/runtime/nodes/credentials.load : default key present. Will migrate");
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// User has provided their own key, but we already have a default key
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// Decrypt using default key
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if (credentialsEncrypted) {
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try {
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credentials = decryptCredentials(defaultKey,credentials)
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} catch(err) {
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credentials = {};
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log.warn(log._("nodes.credentials.error",{message:err.toString()}))
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}
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}
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dirty = true;
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removeDefaultKey = true;
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}
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} else {
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log.debug("red/runtime/nodes/credentials.load : no user key present");
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// User has not provide their own key
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encryptionKey = defaultKey;
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encryptionEnabled = true;
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if (encryptionKey === undefined) {
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log.debug("red/runtime/nodes/credentials.load : no default key present - generating one");
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// No user-provided key, no generated key
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// Generate a new key
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defaultKey = crypto.randomBytes(32).toString('hex');
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try {
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setupEncryptionPromise = settings.set('_credentialSecret',defaultKey);
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encryptionKey = crypto.createHash('sha256').update(defaultKey).digest();
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} catch(err) {
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log.debug("red/runtime/nodes/credentials.load : settings unavailable - disabling encryption");
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// Settings unavailable
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encryptionEnabled = false;
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encryptionKey = null;
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}
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dirty = true;
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} else {
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log.debug("red/runtime/nodes/credentials.load : using default key");
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}
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}
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}
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if (encryptionEnabled && !dirty) {
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encryptedCredentials = credentials;
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}
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return setupEncryptionPromise.then(function() {
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if (credentials.hasOwnProperty("$")) {
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// These are encrypted credentials
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try {
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credentialCache = decryptCredentials(encryptionKey,credentials)
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} catch(err) {
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credentialCache = {};
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dirty = true;
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log.warn(log._("nodes.credentials.error",{message:err.toString()}))
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}
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} else {
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credentialCache = credentials;
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}
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});
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},
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/**
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* Adds a set of credentials for the given node id.
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* @param id the node id for the credentials
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* @param creds an object of credential key/value pairs
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* @return a promise for backwards compatibility TODO: can this be removed?
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*/
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add: function (id, creds) {
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if (!credentialCache.hasOwnProperty(id) || JSON.stringify(creds) !== JSON.stringify(credentialCache[id])) {
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credentialCache[id] = creds;
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dirty = true;
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}
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return when.resolve();
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},
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/**
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* Gets the credentials for the given node id.
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* @param id the node id for the credentials
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* @return the credentials
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*/
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get: function (id) {
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return credentialCache[id];
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},
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/**
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* Deletes the credentials for the given node id.
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* @param id the node id for the credentials
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* @return a promise for the saving of credentials to storage
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*/
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delete: function (id) {
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delete credentialCache[id];
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dirty = true;
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},
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/**
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* Deletes any credentials for nodes that no longer exist
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* @param config a flow config
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* @return a promise for the saving of credentials to storage
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*/
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clean: function (config) {
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var existingIds = {};
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config.forEach(function(n) {
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existingIds[n.id] = true;
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if (n.credentials) {
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api.extract(n);
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}
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});
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var deletedCredentials = false;
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for (var c in credentialCache) {
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if (credentialCache.hasOwnProperty(c)) {
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if (!existingIds[c]) {
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deletedCredentials = true;
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delete credentialCache[c];
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}
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}
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}
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if (deletedCredentials) {
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dirty = true;
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}
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return when.resolve();
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},
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/**
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* Registers a node credential definition.
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* @param type the node type
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* @param definition the credential definition
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*/
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register: function (type, definition) {
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var dashedType = type.replace(/\s+/g, '-');
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credentialsDef[dashedType] = definition;
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},
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/**
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* Extracts and stores any credential updates in the provided node.
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* The provided node may have a .credentials property that contains
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* new credentials for the node.
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* This function loops through the credentials in the definition for
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* the node-type and applies any of the updates provided in the node.
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*
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* This function does not save the credentials to disk as it is expected
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* to be called multiple times when a new flow is deployed.
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*
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* @param node the node to extract credentials from
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*/
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extract: function(node) {
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var nodeID = node.id;
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var nodeType = node.type;
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var newCreds = node.credentials;
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if (newCreds) {
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delete node.credentials;
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var savedCredentials = credentialCache[nodeID] || {};
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var dashedType = nodeType.replace(/\s+/g, '-');
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var definition = credentialsDef[dashedType];
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if (!definition) {
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log.warn(log._("nodes.credentials.not-registered",{type:nodeType}));
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return;
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}
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for (var cred in definition) {
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if (definition.hasOwnProperty(cred)) {
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if (newCreds[cred] === undefined) {
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continue;
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}
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if (definition[cred].type == "password" && newCreds[cred] == '__PWRD__') {
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continue;
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}
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if (0 === newCreds[cred].length || /^\s*$/.test(newCreds[cred])) {
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delete savedCredentials[cred];
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dirty = true;
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continue;
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}
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if (!savedCredentials.hasOwnProperty(cred) || JSON.stringify(savedCredentials[cred]) !== JSON.stringify(newCreds[cred])) {
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savedCredentials[cred] = newCreds[cred];
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dirty = true;
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}
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}
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}
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credentialCache[nodeID] = savedCredentials;
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}
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},
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/**
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* Gets the credential definition for the given node type
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* @param type the node type
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* @return the credential definition
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*/
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getDefinition: function (type) {
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return credentialsDef[type];
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},
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dirty: function() {
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return dirty;
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},
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export: function() {
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var result = credentialCache;
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if (encryptionEnabled) {
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if (dirty) {
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try {
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log.debug("red/runtime/nodes/credentials.export : encrypting");
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var initVector = crypto.randomBytes(16);
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var cipher = crypto.createCipheriv(encryptionAlgorithm, encryptionKey, initVector);
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result = {"$":initVector.toString('hex') + cipher.update(JSON.stringify(credentialCache), 'utf8', 'base64') + cipher.final('base64')};
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} catch(err) {
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log.warn(log._("nodes.credentials.error-saving",{message:err.toString()}))
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}
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} else {
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result = encryptedCredentials;
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}
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}
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dirty = false;
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if (removeDefaultKey) {
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log.debug("red/runtime/nodes/credentials.export : removing unused default key");
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return settings.delete('_credentialSecret').then(function() {
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removeDefaultKey = false;
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return result;
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})
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} else {
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return when.resolve(result);
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}
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}
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}
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