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/
auth_utils.js
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/
auth_utils.js
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/*
* Copyright 2018 Red Hat Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
const https = require('https');
const url = require('url');
const kubernetes = require('../lib/kubernetes.js');
const CookieDecoder = require('../lib/cookie_decoder.js');
const oauth2_factory = require('simple-oauth2');
const openid_connect = require('openid-client');
const rhea = require('rhea');
var log = require("./log.js").logger();
const myutils = require('./utils.js');
const RFC6749_VALID_ACCESS_TOKEN = RegExp('^[\x20-\x7F]+$');
const SSO_COOKIE_NAME = "_oauth_proxy";
function my_request(original, defaults, options, callback) {
var merge = myutils.merge({}, defaults, options);
return original(merge, callback);
}
function set_defaults(defaults) {
https.request = my_request.bind(undefined, https.request, defaults)
}
function set_cookie(response, name, value, options) {
let cookie = name + '=' + value;
for (let i = 0; options && i < options.length; i++) {
cookie += '; ' + options[0];
}
if (response.cookies === undefined) {
response.cookies = [cookie];
} else {
response.cookies.push(cookie);
}
response.setHeader('Set-Cookie', response.cookies);
}
function clear_cookie(response, name) {
set_cookie(response, name, '', ['Expires ' + new Date().toUTCString()]);
}
function get_cookies(request) {
let cookies = {};
let header = request.headers.cookie;
if (header) {
let items = header.split(';');
for (let i = 0; i < items.length; i++) {
let parts = items[i].split('=');
cookies[parts.shift().trim()] = decodeURI(parts.join('='));
}
}
return cookies;
}
const SESSION_ID = 'session-id';
function init_session(sessions, request, response) {
let id = get_cookies(request)[SESSION_ID];
if (id === undefined || sessions[id] === undefined) {
id = rhea.generate_uuid();
sessions[id] = {};
set_cookie(response, SESSION_ID, id);
log.info('created session: %s', id);
}
request.session = sessions[id];
touch_session(request.session);
return request.session;
}
function expunge_session(sessions, request, response) {
let id = get_cookies(request)[SESSION_ID];
if (id === undefined || sessions[id] === undefined) {
return;
}
delete sessions[id];
}
function restore_session(sessions, request) {
let id = get_cookies(request)[SESSION_ID];
request.session = sessions[id];
if (request.session) {
touch_session(request.session);
} else {
log.info('session not found: %s', id);
}
return request.session;
}
function touch_session(session) {
session.last_used = Date.now();
}
function store_in_session(request, key, value) {
request.session[key] = value;
}
function get_from_session(request, key) {
return request.session ? request.session[key] : undefined;
}
function remove_from_session(request, key) {
delete request.session[key];
}
function purge_stale_sessions(sessions, max_idle_time) {
for (let id in sessions) {
if ((Date.now() - sessions[id].last_used) > max_idle_time) {
log.info('Deleting stale session %s', id);
delete sessions[id];
}
}
}
function step(interceptors, request, response, i, handler) {
if (i < interceptors.length) {
interceptors[i](request, response, step.bind(undefined, interceptors, request, response, i+1, handler));
} else {
handler(request, response);
}
}
function get_oauth_credentials(request) {
return {
username: get_from_session(request, 'username'),
token: get_from_session(request, 'token')
};
}
function restore_oauth_credentials(sessions, request) {
restore_session(sessions, request);
return get_oauth_credentials(request);
}
function websocket_auth(authz, env, get_credentials) {
return function (request, ws_upgrade_completion_callback) {
let credentials = get_credentials(request);
let token = credentials.token ? credentials.token.getAccessToken() : null;
var options = {"token": token};
var onrejected = function (error) {
log.error('Failed to authorize websocket: %s', error);
ws_upgrade_completion_callback(false, 401, 'Authorization Required');
};
const namespace = env.ADDRESS_SPACE_NAMESPACE;
kubernetes.self_subject_access_review(options, namespace,
"list", "enmasse.io", "addresses").then(({allowed: allowed_list, reason: reason_list}) => {
if (allowed_list) {
kubernetes.self_subject_access_review(options, namespace,
"create", "enmasse.io", "addresses").then(({allowed: allowed_create, reason: reason_create}) => {
if (allowed_create) {
authz.set_authz_props(request, credentials, {admin: allowed_create, console: true});
ws_upgrade_completion_callback(true);
} else {
kubernetes.self_subject_access_review(options, namespace,
"delete", "enmasse.io", "addresses").then(({allowed: allowed_delete, reason: reason_delete}) => {
authz.set_authz_props(request, credentials, {admin: allowed_delete, console: true});
ws_upgrade_completion_callback(true);
if (!allowed_delete) {
log.info("User has neither create nor delete address permission, not granting console admin permission. [%j, %j]",
reason_create, reason_delete);
}
}).catch(onrejected);
}
}).catch(onrejected);
} else {
log.warn("User does not have list address permission, not granting console access. [%j]",
reason_list);
authz.set_authz_props(request, credentials, {admin: false, console: false});
ws_upgrade_completion_callback(true);
}
}).catch(onrejected);
}
}
let sessions = {};
module.exports.ws_auth_handler = function (authz, env) {
return websocket_auth(authz, env, restore_oauth_credentials.bind(null, sessions));
};
module.exports.init_auth_handler = function (openshift, env) {
var discovery_uri = env.CONSOLE_OAUTH_DISCOVERY_URL;
log.debug("Discovery url : %s", discovery_uri);
if (openshift) {
if (discovery_uri.startsWith("data:")) {
return new Promise((resolve, reject) => {
try {
var b64string = discovery_uri.replace(/^data:.*,/, '');
var data = Buffer.from(b64string, 'base64');
resolve(JSON.parse(data));
} catch (e) {
reject(e);
}
});
} else {
let discoveryUri = url.parse(discovery_uri, false);
return new Promise((resolve, reject) => {
https.get({
hostname: discoveryUri.hostname,
port: discoveryUri.port,
path: discoveryUri.path,
protocol: discoveryUri.protocol,
rejectUnauthorized: false,
}, (response) => {
log.info('GET %s => %s ', discovery_uri, response.statusCode);
response.setEncoding('utf8');
var data = '';
response.on('data', function (chunk) { data += chunk; });
response.on('end', function () {
if (response.statusCode === 200) {
try {
resolve(JSON.parse(data));
} catch (e) {
reject(new Error(util.format('Could not parse message as JSON (%s): %s', e, data)));
}
} else {
var error = new Error(util.format('Failed to retrieve %s: %s %s', discovery_uri, response.statusCode, data));
error.statusCode = response.statusCode;
reject(error);
}
});
});
});
}
} else {
return openid_connect.Issuer.discover(discovery_uri);
}
};
module.exports.auth_handler = function (authz, env, handler, auth_context, openshift) {
set_defaults({rejectUnauthorized:false});
setInterval(purge_stale_sessions.bind(null, sessions, 15*60*1000), 60*1000);
var patch_handler = function (request, response, next) {
request.protocol = request.connection.encrypted ? "https" : "http";
let u = url.parse(request.url, true);
request.hostname = u.hostname || request.headers.host.split(':')[0];
response.redirect = function (target) {
log.info("Sending redirect: %s", target);
response.statusCode = 302;
response.setHeader('Location', target);
response.end();
};
response.status = function (code) {
response.statusCode = code;
return response;
};
next();
};
var init_session_handler = function (request, response, next) {
init_session(sessions, request, response);
next();
};
var logout_handler = function (path, redirect, request, response, next) {
let u = url.parse(request.url, true);
if (u.pathname === path) {
var token = get_from_session(request, "token");
expunge_session(sessions, request, response);
if (token) {
token.revokeAll().catch(() => {
log.warn("Failed to revoke access token");
}).finally(() => {
response.redirect(redirect);
});
} else {
response.redirect(redirect);
}
} else {
next();
}
};
var sso_cookie_handler = function (cookie_decoder, request, response, next) {
var cookies = get_cookies(request);
if (!get_from_session(request, "token") && SSO_COOKIE_NAME in cookies) {
var oauthproxy_cookie = cookies[SSO_COOKIE_NAME];
try {
var state = cookie_decoder.decode(oauthproxy_cookie);
if (state.access_token) {
if (RFC6749_VALID_ACCESS_TOKEN.test(state.access_token)) {
log.info("Authenticated using SSO cookie - user : %s", state.user);
store_in_session(request, "token", {
getAccessToken: function () {
return state.access_token;
},
revokeAll: function () {
// no op - don't revoke the token as it doesn't belong to us
return Promise.resolve();
}
});
store_in_session(request, 'username', state.user);
} else {
log.debug("Access token within SSO cookie malformed, probably wrong cookie key.");
}
} else {
log.debug("No access token found in SSO cookie");
}
} catch (e) {
log.debug("Failed to decode SSO cookie, probably wrong cookie key.", e);
} finally {
next();
}
} else {
next();
}
};
var openidconnect_handler = function (request, response, next) {
if (!get_from_session(request, "token")) {
let u = url.parse(request.url, true);
if (u.pathname === "/authcallback" && u.query.code) {
var saved_request_url = get_from_session(request, "saved_request_url");
var saved_redirect_url = get_from_session(request, "saved_redirect_url");
var state = get_from_session(request, "state");
var client = get_from_session(request, "openid");
client.authorizationCallback(saved_redirect_url, u.query, {state: state, code: 'code'})
.then(function (tokenSet) {
tokenSet.getAccessToken = function () {
return tokenSet.id_token;
};
tokenSet.revokeAll = function () {
return client.revoke(tokenSet);
};
store_in_session(request, "token", tokenSet);
response.redirect(saved_request_url);
})
.catch((error) => {
console.error('OpenID Connect Error', error);
response.status(500).end('Authentication failed');
}).finally(() => {
remove_from_session(request, "openid");
remove_from_session(request, "state");
remove_from_session(request, "saved_request_url");
remove_from_session(request, "saved_redirect_url");
});
} else {
const client = new auth_context.Client({
client_id: env.CONSOLE_OAUTH_CLIENT_ID,
client_secret: env.CONSOLE_OAUTH_CLIENT_SECRET,
});
let state = rhea.generate_uuid();
let redirect_uri = request.protocol + "://" + request.headers.host + "/authcallback";
store_in_session(request, "openid", client);
store_in_session(request, "state", state);
store_in_session(request, "saved_request_url", request.url);
store_in_session(request, "saved_redirect_url", redirect_uri);
const authorization_url = client.authorizationUrl({
redirect_uri: redirect_uri,
scope: env.CONSOLE_OAUTH_SCOPE,
state: state,
response_type: 'code'
});
// redirect
response.redirect(authorization_url)
}
} else {
next();
}
};
var oauth_handler = function (request, response, next) {
if (!get_from_session(request, "token")) {
let u = url.parse(request.url, true);
if (u.pathname === "/authcallback" && u.query.code) {
var saved_request_url = get_from_session(request, "saved_request_url");
var saved_redirect_url = get_from_session(request, "saved_redirect_url");
var oauth2 = get_from_session(request, "oauth2");
const code = u.query.code;
try {
const options = {
code: code,
redirect_uri: saved_redirect_url
};
oauth2.authorizationCode.getToken(options).then(
result => {
const token = oauth2.accessToken.create(result);
if (!token.getAccessToken) {
token.getAccessToken = function() {
if (this.token && this.token.access_token) {
return this.token.access_token;
} else {
return null;
}
}
}
store_in_session(request, "token", token);
// TODO not getting a refresh_token from openshift - not sure why?
if (token.token.expires_in && token.token.refresh_token) {
var scheduleRefreshFunc = function() {
var timeout = token.token.expires_in / 2;
log.info("Scheduling OAuth token refresh %ds", timeout);
setTimeout(() => {
log.info("OAuth token has timed out");
token.refresh().then(newToken => {
log.info("OAuth token refresh token complete");
store_in_session(request, "token", newToken);
scheduleRefreshFunc();
}).catch((e) => {
log.error("Failed to refresh token", e);
});
}, timeout * 1000)
};
scheduleRefreshFunc();
}
response.redirect(saved_request_url);
}
).catch(error => {
console.error('Access Token Error', error.message);
response.status(500).end('Authentication failed');
}
).finally(() => {
remove_from_session(request, "oauth2");
remove_from_session(request, "saved_request_url");
remove_from_session(request, "saved_redirect_url");
});
} catch(error) {
console.error('Access Token Error', error.message);
response.status(500).end('Authentication failed');
}
} else {
try {
const credentials = {
client: {
id: env.CONSOLE_OAUTH_CLIENT_ID,
secret: env.CONSOLE_OAUTH_CLIENT_SECRET,
},
auth: {
tokenHost: auth_context.issuer,
authorizePath: auth_context.authorization_endpoint,
tokenPath: auth_context.token_endpoint,
},
options: {
authorizationMethod: 'body'
},
};
let state = rhea.generate_uuid();
let oauth2 = oauth2_factory.create(credentials);
let redirect_uri = request.protocol + "://" + request.headers.host + "/authcallback";
store_in_session(request, "oauth2", oauth2);
store_in_session(request, "saved_request_url", request.url);
store_in_session(request, "saved_redirect_url", redirect_uri);
const authorization_url = oauth2.authorizationCode.authorizeURL({
redirect_uri: redirect_uri,
scope: env.CONSOLE_OAUTH_SCOPE,
state: state
});
// redirect
response.redirect(authorization_url)
} catch (error) {
console.error('Authorization Error', error.message);
response.status(500).end('Authentication failed');
}
}
} else {
next();
}
};
var get_user_handler = function (request, response, next) {
const token = get_from_session(request, "token");
if (token && !get_from_session(request, "username") ) {
kubernetes.whoami({token: token.getAccessToken()}).then((data) => {
if (data.username) {
log.info("User identified as : %s", data.username);
store_in_session(request, 'username', data.username);
}
}).catch((e) => {
log.warn("Failed to get username for authenticated user", e);
}).finally(() => {
next();
});
} else {
next();
}
};
var logginghandler = function (request, response, next) {
log.debug("Serving %s", request.url);
next();
};
let interceptors = [];
interceptors.push(patch_handler);
if (env.CONSOLE_LINK) {
interceptors.push(logout_handler.bind(null, "/console", env.CONSOLE_LINK));
}
interceptors.push(init_session_handler);
interceptors.push(logout_handler.bind(null, "/logout", "/"));
if (env.SSO_COOKIE_SECRET) {
try {
const decoder = new CookieDecoder(env.SSO_COOKIE_SECRET);
interceptors.push(sso_cookie_handler.bind(null, decoder));
} catch (e) {
log.warn("Cookie secret not of expected length, SSO disabled.", e);
}
}
interceptors.push(openshift ? oauth_handler : openidconnect_handler);
if (openshift) {
interceptors.push(get_user_handler);
}
interceptors.push(logginghandler);
return function (request, response) {
step(interceptors, request, response, 0, handler);
};
}