node-ldapjs/lib/server.js

911 lines
23 KiB
JavaScript

// Copyright 2011 Mark Cavage, Inc. All rights reserved.
var assert = require('assert');
var EventEmitter = require('events').EventEmitter;
var net = require('net');
var tls = require('tls');
var util = require('util');
var asn1 = require('asn1');
var VError = require('verror').VError;
var dn = require('./dn');
var dtrace = require('./dtrace');
var errors = require('./errors');
var Protocol = require('./protocol');
var Parser = require('./messages').Parser;
var AbandonResponse = require('./messages/abandon_response');
var AddResponse = require('./messages/add_response');
var BindResponse = require('./messages/bind_response');
var CompareResponse = require('./messages/compare_response');
var DeleteResponse = require('./messages/del_response');
var ExtendedResponse = require('./messages/ext_response');
var LDAPResult = require('./messages/result');
var ModifyResponse = require('./messages/modify_response');
var ModifyDNResponse = require('./messages/moddn_response');
var SearchRequest = require('./messages/search_request');
var SearchResponse = require('./messages/search_response');
var UnbindResponse = require('./messages/unbind_response');
///--- Globals
var Ber = asn1.Ber;
var BerReader = asn1.BerReader;
var DN = dn.DN;
var sprintf = util.format;
///--- Helpers
function mergeFunctionArgs(argv, start, end) {
assert.ok(argv);
if (!start)
start = 0;
if (!end)
end = argv.length;
var handlers = [];
for (var i = start; i < end; i++) {
if (argv[i] instanceof Array) {
var arr = argv[i];
for (var j = 0; j < arr.length; j++) {
if (!(arr[j] instanceof Function)) {
throw new TypeError('Invalid argument type: ' + typeof (arr[j]));
}
handlers.push(arr[j]);
}
} else if (argv[i] instanceof Function) {
handlers.push(argv[i]);
} else {
throw new TypeError('Invalid argument type: ' + typeof (argv[i]));
}
}
return handlers;
}
function getResponse(req) {
assert.ok(req);
var Response;
switch (req.protocolOp) {
case Protocol.LDAP_REQ_BIND:
Response = BindResponse;
break;
case Protocol.LDAP_REQ_ABANDON:
Response = AbandonResponse;
break;
case Protocol.LDAP_REQ_ADD:
Response = AddResponse;
break;
case Protocol.LDAP_REQ_COMPARE:
Response = CompareResponse;
break;
case Protocol.LDAP_REQ_DELETE:
Response = DeleteResponse;
break;
case Protocol.LDAP_REQ_EXTENSION:
Response = ExtendedResponse;
break;
case Protocol.LDAP_REQ_MODIFY:
Response = ModifyResponse;
break;
case Protocol.LDAP_REQ_MODRDN:
Response = ModifyDNResponse;
break;
case Protocol.LDAP_REQ_SEARCH:
Response = SearchResponse;
break;
case Protocol.LDAP_REQ_UNBIND:
Response = UnbindResponse;
break;
default:
return null;
}
assert.ok(Response);
var res = new Response({
messageID: req.messageID,
log: req.log,
attributes: ((req instanceof SearchRequest) ? req.attributes : undefined)
});
res.connection = req.connection;
res.logId = req.logId;
return res;
}
function decodeDN(req, strict) {
assert.ok(req);
var parse;
if (strict) {
parse = dn.parse;
} else {
parse = function (input) {
try {
return dn.parse(input);
} catch (e) {
return input;
}
};
}
switch (req.protocolOp) {
case Protocol.LDAP_REQ_BIND:
req.name = parse(req.name);
break;
case Protocol.LDAP_REQ_ADD:
case Protocol.LDAP_REQ_COMPARE:
case Protocol.LDAP_REQ_DELETE:
req.entry = parse(req.entry);
break;
case Protocol.LDAP_REQ_MODIFY:
req.object = parse(req.object);
break;
case Protocol.LDAP_REQ_MODRDN:
req.entry = parse(req.entry);
// TODO: handle newRdn/Superior
break;
case Protocol.LDAP_REQ_SEARCH:
req.baseObject = parse(req.baseObject);
break;
default:
break;
}
}
function defaultHandler(req, res, next) {
assert.ok(req);
assert.ok(res);
assert.ok(next);
res.matchedDN = req.dn.toString();
res.errorMessage = 'Server method not implemented';
res.end(errors.LDAP_OTHER);
return next();
}
function defaultNoOpHandler(req, res, next) {
assert.ok(req);
assert.ok(res);
assert.ok(next);
res.end();
return next();
}
function noSuffixHandler(req, res, next) {
assert.ok(req);
assert.ok(res);
assert.ok(next);
res.errorMessage = 'No tree found for: ' + req.dn.toString();
res.end(errors.LDAP_NO_SUCH_OBJECT);
return next();
}
function noExOpHandler(req, res, next) {
assert.ok(req);
assert.ok(res);
assert.ok(next);
res.errorMessage = req.requestName + ' not supported';
res.end(errors.LDAP_PROTOCOL_ERROR);
return next();
}
function fireDTraceProbe(req, res) {
assert.ok(req);
req._dtraceId = res._dtraceId = dtrace._nextId();
var probeArgs = [
req._dtraceId,
req.connection.remoteAddress || 'localhost',
req.connection.ldap.bindDN.toString(),
req.dn.toString()
];
var op;
switch (req.protocolOp) {
case Protocol.LDAP_REQ_ABANDON:
op = 'abandon';
break;
case Protocol.LDAP_REQ_ADD:
op = 'add';
probeArgs.push(req.attributes.length);
break;
case Protocol.LDAP_REQ_BIND:
op = 'bind';
break;
case Protocol.LDAP_REQ_COMPARE:
op = 'compare';
probeArgs.push(req.attribute);
probeArgs.push(req.value);
break;
case Protocol.LDAP_REQ_DELETE:
op = 'delete';
break;
case Protocol.LDAP_REQ_EXTENSION:
op = 'exop';
probeArgs.push(req.name);
probeArgs.push(req.value);
break;
case Protocol.LDAP_REQ_MODIFY:
op = 'modify';
probeArgs.push(req.changes.length);
break;
case Protocol.LDAP_REQ_MODRDN:
op = 'modifydn';
probeArgs.push(req.newRdn.toString());
probeArgs.push((req.newSuperior ? req.newSuperior.toString() : ''));
break;
case Protocol.LDAP_REQ_SEARCH:
op = 'search';
probeArgs.push(req.scope);
probeArgs.push(req.filter.toString());
break;
case Protocol.LDAP_REQ_UNBIND:
op = 'unbind';
break;
default:
break;
}
res._dtraceOp = op;
dtrace.fire('server-' + op + '-start', function () {
return probeArgs;
});
}
///--- API
/**
* Constructs a new server that you can call .listen() on, in the various
* forms node supports. You need to first assign some handlers to the various
* LDAP operations however.
*
* The options object currently only takes a certificate/private key, and a
* bunyan logger handle.
*
* This object exposes the following events:
* - 'error'
* - 'close'
*
* @param {Object} options (optional) parameterization object.
* @throws {TypeError} on bad input.
*/
function Server(options) {
if (options) {
if (typeof (options) !== 'object')
throw new TypeError('options (object) required');
if (typeof (options.log) !== 'object')
throw new TypeError('options.log must be an object');
if (options.certificate || options.key) {
if (!(options.certificate && options.key) ||
(typeof (options.certificate) !== 'string' &&
!Buffer.isBuffer(options.certificate)) ||
(typeof (options.key) !== 'string' &&
!Buffer.isBuffer(options.key))) {
throw new TypeError('options.certificate and options.key ' +
'(string or buffer) are both required for TLS');
}
}
} else {
options = {};
}
var self = this;
EventEmitter.call(this, options);
this._chain = [];
this.log = options.log;
this.strictDN = (options.strictDN !== undefined) ? options.strictDN : true;
var log = this.log;
function setupConnection(c) {
assert.ok(c);
if (c.type === 'unix') {
c.remoteAddress = self.server.path;
c.remotePort = c.fd;
} else if (c.socket) {
// TLS
c.remoteAddress = c.socket.remoteAddress;
c.remotePort = c.socket.remotePort;
}
var rdn = new dn.RDN({cn: 'anonymous'});
c.ldap = {
id: c.remoteAddress + ':' + c.remotePort,
config: options,
_bindDN: new DN([rdn])
};
c.addListener('timeout', function () {
log.trace('%s timed out', c.ldap.id);
c.destroy();
});
c.addListener('end', function () {
log.trace('%s shutdown', c.ldap.id);
});
c.addListener('error', function (err) {
log.warn('%s unexpected connection error', c.ldap.id, err);
self.emit('clientError', err);
c.destroy();
});
c.addListener('close', function (had_err) {
log.trace('%s close; had_err=%j', c.ldap.id, had_err);
c.end();
});
c.ldap.__defineGetter__('bindDN', function () {
return c.ldap._bindDN;
});
c.ldap.__defineSetter__('bindDN', function (val) {
if (!(val instanceof DN))
throw new TypeError('DN required');
c.ldap._bindDN = val;
return val;
});
return c;
}
function newConnection(c) {
setupConnection(c);
log.trace('new connection from %s', c.ldap.id);
dtrace.fire('server-connection', function () {
return [c.remoteAddress];
});
c.parser = new Parser({
log: options.log
});
c.parser.on('message', function (req) {
req.connection = c;
req.logId = c.ldap.id + '::' + req.messageID;
req.startTime = new Date().getTime();
if (log.debug())
log.debug('%s: message received: req=%j', c.ldap.id, req.json);
var res = getResponse(req);
if (!res) {
log.warn('Unimplemented server method: %s', req.type);
c.destroy();
return false;
}
// parse string DNs for routing/etc
decodeDN(req, this.strictDN);
res.connection = c;
res.logId = req.logId;
res.requestDN = req.dn;
var chain = self._getHandlerChain(req, res);
var i = 0;
return function (err) {
function sendError(err) {
res.status = err.code || errors.LDAP_OPERATIONS_ERROR;
res.matchedDN = req.suffix ? req.suffix.toString() : '';
res.errorMessage = err.message || '';
return res.end();
}
function after() {
if (!self._postChain || !self._postChain.length)
return;
function next() {} // stub out next for the post chain
self._postChain.forEach(function (c) {
c.call(self, req, res, next);
});
}
if (err) {
log.trace('%s sending error: %s', req.logId, err.stack || err);
self.emit('clientError', err);
sendError(err);
return after();
}
try {
var next = arguments.callee;
if (chain.handlers[i])
return chain.handlers[i++].call(chain.backend, req, res, next);
if (req.protocolOp === Protocol.LDAP_REQ_BIND && res.status === 0)
c.ldap.bindDN = req.dn;
return after();
} catch (e) {
if (!e.stack)
e.stack = e.toString();
log.error('%s uncaught exception: %s', req.logId, e.stack);
return sendError(new errors.OperationsError(e.message));
}
}();
});
c.parser.on('error', function (err, message) {
self.emit('error', new VError(err, 'Parser error for %s', c.ldap.id));
if (!message)
return c.destroy();
var res = getResponse(message);
if (!res)
return c.destroy();
res.status = 0x02; // protocol error
res.errorMessage = err.toString();
return c.end(res.toBer());
});
c.on('data', function (data) {
if (log.trace())
log.trace('data on %s: %s', c.ldap.id, util.inspect(data));
c.parser.write(data);
});
} // end newConnection
this.routes = {};
if ((options.cert || options.certificate) && options.key) {
options.cert = options.cert || options.certificate;
this.server = tls.createServer(options, newConnection);
} else {
this.server = net.createServer(newConnection);
}
this.server.log = options.log;
this.server.ldap = {
config: options
};
this.server.on('close', function () {
self.emit('close');
});
this.server.on('error', function (err) {
self.emit('error', err);
});
this.__defineGetter__('maxConnections', function () {
return self.server.maxConnections;
});
this.__defineSetter__('maxConnections', function (val) {
self.server.maxConnections = val;
});
this.__defineGetter__('connections', function () {
return self.server.connections;
});
this.__defineGetter__('name', function () {
return 'LDAPServer';
});
this.__defineGetter__('url', function () {
var str;
if (!this.server.address().family) {
str = 'ldapi://';
str += this.host.replace(new RegExp('/', 'g'), '%2f');
return str;
}
if (this.server instanceof tls.Server) {
str = 'ldaps://';
} else {
str = 'ldap://';
}
str += self.host || 'localhost';
str += ':';
str += self.port || 389;
return str;
});
}
util.inherits(Server, EventEmitter);
module.exports = Server;
/**
* Adds a handler (chain) for the LDAP add method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.add = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_ADD, name, args);
};
/**
* Adds a handler (chain) for the LDAP bind method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.bind = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_BIND, name, args);
};
/**
* Adds a handler (chain) for the LDAP compare method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.compare = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_COMPARE, name, args);
};
/**
* Adds a handler (chain) for the LDAP delete method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.del = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_DELETE, name, args);
};
/**
* Adds a handler (chain) for the LDAP exop method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name OID to assign this handler chain to.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input.
*/
Server.prototype.exop = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_EXTENSION, name, args, true);
};
/**
* Adds a handler (chain) for the LDAP modify method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.modify = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_MODIFY, name, args);
};
/**
* Adds a handler (chain) for the LDAP modifyDN method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.modifyDN = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_MODRDN, name, args);
};
/**
* Adds a handler (chain) for the LDAP search method.
*
* Note that this is of the form f(name, [function]) where the second...N
* arguments can all either be functions or arrays of functions.
*
* @param {String} name the DN to mount this handler chain at.
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.search = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
return this._mount(Protocol.LDAP_REQ_SEARCH, name, args);
};
/**
* Adds a handler (chain) for the LDAP unbind method.
*
* This method is different than the others and takes no mount point, as unbind
* is a connection-wide operation, not constrianed to part of the DIT.
*
* @return {Server} this so you can chain calls.
* @throws {TypeError} on bad input
*/
Server.prototype.unbind = function () {
var args = Array.prototype.slice.call(arguments, 0);
return this._mount(Protocol.LDAP_REQ_UNBIND, 'unbind', args, true);
};
Server.prototype.use = function use() {
var args = Array.prototype.slice.call(arguments);
var chain = mergeFunctionArgs(args, 0, args.length);
var self = this;
chain.forEach(function (c) {
self._chain.push(c);
});
};
Server.prototype.after = function () {
if (!this._postChain)
this._postChain = [];
var self = this;
mergeFunctionArgs(arguments).forEach(function (h) {
self._postChain.push(h);
});
};
// All these just reexpose the requisite net.Server APIs
Server.prototype.listen = function (port, host, callback) {
if (typeof (port) !== 'number' && typeof (port) !== 'string')
throw new TypeError('port (number or path) required');
if (typeof (host) === 'function') {
callback = host;
host = '0.0.0.0';
}
if (typeof (port) === 'string' && /^[0-9]+$/.test(port)) {
// Disambiguate between string ports and file paths
port = parseInt(port, 10);
}
var self = this;
function _callback() {
if (typeof (port) === 'number') {
self.host = self.address().address;
self.port = self.address().port;
} else {
self.host = port;
self.port = self.server.fd;
}
if (typeof (callback) === 'function')
callback();
}
if (typeof (port) === 'number') {
return this.server.listen(port, host, _callback);
} else {
return this.server.listen(port, _callback);
}
};
Server.prototype.listenFD = function (fd) {
this.host = 'unix-domain-socket';
this.port = fd;
return this.server.listenFD(fd);
};
Server.prototype.close = function () {
return this.server.close();
};
Server.prototype.address = function () {
return this.server.address();
};
Server.prototype._getRoute = function (_dn, backend) {
assert.ok(dn);
if (!backend)
backend = this;
var name;
if (_dn instanceof dn.DN) {
name = _dn.toString();
} else {
name = _dn;
}
if (!this.routes[name]) {
this.routes[name] = {};
this.routes[name].backend = backend;
this.routes[name].dn = _dn;
// Force regeneration of the route key cache on next request
this._routeKeyCache = null;
}
return this.routes[name];
};
Server.prototype._sortedRouteKeys = function _sortedRouteKeys() {
// The filtered/sorted route keys are cached to prevent needlessly
// regenerating the list for every incoming request.
if (!this._routeKeyCache) {
var self = this;
var reversedRDNsToKeys = {};
// Generate mapping of reversedRDNs(DN) -> routeKey
Object.keys(this.routes).forEach(function (key) {
var _dn = self.routes[key].dn;
// Ignore non-DN routes such as exop or unbind
if (_dn instanceof dn.DN) {
var reversed = _dn.clone();
reversed.rdns.reverse();
reversedRDNsToKeys[reversed.spaced(true).toString()] = key;
}
});
var output = [];
// Reverse-sort on reversedRDS(DN) in order to output routeKey list.
// This will place more specific DNs in front of their parents:
// 1. dc=test, dc=domain, dc=sub
// 2. dc=test, dc=domain
// 3. dc=other, dc=foobar
Object.keys(reversedRDNsToKeys).sort().reverse().forEach(function (_dn) {
output.push(reversedRDNsToKeys[_dn]);
});
this._routeKeyCache = output;
}
return this._routeKeyCache;
};
Server.prototype._getHandlerChain = function _getHandlerChain(req, res) {
assert.ok(req);
fireDTraceProbe(req, res);
// check anonymous bind
if (req.protocolOp === Protocol.LDAP_REQ_BIND &&
req.dn.toString() === '' &&
req.credentials === '') {
return {
backend: self,
handlers: [defaultNoOpHandler]
};
}
var op = '0x' + req.protocolOp.toString(16);
var self = this;
var routes = this.routes;
var route;
// Special cases are exops, unbinds and abandons. Handle those first.
if (req.protocolOp === Protocol.LDAP_REQ_EXTENSION) {
route = routes[req.requestName];
if (route) {
return {
backend: route.backend,
handlers: (route[op] ? route[op] : [noExOpHandler])
};
} else {
return {
backend: self,
handlers: [noExOpHandler]
};
}
} else if (req.protocolOp === Protocol.LDAP_REQ_UNBIND) {
route = routes['unbind'];
if (route) {
return {
backend: route.backend,
handlers: route[op]
};
} else {
return {
backend: self,
handlers: [defaultNoOpHandler]
};
}
} else if (req.protocolOp === Protocol.LDAP_REQ_ABANDON) {
return {
backend: self,
handlers: [defaultNoOpHandler]
};
}
// Otherwise, match via DN rules
assert.ok(req.dn);
var keys = this._sortedRouteKeys();
var fallbackHandler = [noSuffixHandler];
// invalid DNs in non-strict mode are routed to the default handler
var testDN = (typeof (req.dn) === 'string') ? '' : req.dn;
for (var i = 0; i < keys.length; i++) {
var suffix = keys[i];
route = routes[suffix];
assert.ok(route.dn);
// Match a valid route or the route wildcard ('')
if (route.dn.equals(testDN) || route.dn.parentOf(testDN) || suffix === '') {
if (route[op]) {
// We should be good to go.
req.suffix = route.dn;
return {
backend: route.backend,
handlers: route[op]
};
} else {
// We found a valid suffix but not a valid operation.
// There might be a more generic suffix with a legitimate operation.
fallbackHandler = [defaultHandler];
}
}
}
return {
backend: self,
handlers: fallbackHandler
};
};
Server.prototype._mount = function (op, name, argv, notDN) {
assert.ok(op);
assert.ok(name !== undefined);
assert.ok(argv);
if (typeof (name) !== 'string')
throw new TypeError('name (string) required');
if (!argv.length)
throw new Error('at least one handler required');
var backend = this;
var index = 0;
if (typeof (argv[0]) === 'object' && !Array.isArray(argv[0])) {
backend = argv[0];
index = 1;
}
var route = this._getRoute(notDN ? name : dn.parse(name), backend);
var chain = this._chain.slice();
argv.slice(index).forEach(function (a) {
chain.push(a);
});
route['0x' + op.toString(16)] = mergeFunctionArgs(chain);
return this;
};