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"use strict";
var f = require('util').format
, require_optional = require('require_optional')
, Query = require('../connection/commands').Query
, MongoError = require('../error');
var AuthSession = function(db, username, password, options) {
this.db = db;
this.username = username;
this.password = password;
this.options = options;
}
AuthSession.prototype.equal = function(session) {
return session.db == this.db
&& session.username == this.username
&& session.password == this.password;
}
// Kerberos class
var Kerberos = null;
var MongoAuthProcess = null;
// Try to grab the Kerberos class
try {
Kerberos = require_optional('kerberos').Kerberos;
// Authentication process for Mongo
MongoAuthProcess = require_optional('kerberos').processes.MongoAuthProcess;
} catch(err) {
}
/**
* Creates a new GSSAPI authentication mechanism
* @class
* @return {GSSAPI} A cursor instance
*/
var GSSAPI = function(bson) {
this.bson = bson;
this.authStore = [];
}
/**
* Authenticate
* @method
* @param {{Server}|{ReplSet}|{Mongos}} server Topology the authentication method is being called on
* @param {[]Connections} connections Connections to authenticate using this authenticator
* @param {string} db Name of the database
* @param {string} username Username
* @param {string} password Password
* @param {authResultCallback} callback The callback to return the result from the authentication
* @return {object}
*/
GSSAPI.prototype.auth = function(server, connections, db, username, password, options, callback) {
var self = this;
// We don't have the Kerberos library
if(Kerberos == null) return callback(new Error("Kerberos library is not installed"));
var gssapiServiceName = options['gssapiServiceName'] || 'mongodb';
// Total connections
var count = connections.length;
if(count == 0) return callback(null, null);
// Valid connections
var numberOfValidConnections = 0;
var errorObject = null;
// For each connection we need to authenticate
while(connections.length > 0) {
// Execute MongoCR
var execute = function(connection) {
// Start Auth process for a connection
GSSAPIInitialize(self, db, username, password, db, gssapiServiceName, server, connection, options, function(err, r) {
// Adjust count
count = count - 1;
// If we have an error
if(err) {
errorObject = err;
} else if(r.result['$err']) {
errorObject = r.result;
} else if(r.result['errmsg']) {
errorObject = r.result;
} else {
numberOfValidConnections = numberOfValidConnections + 1;
}
// We have authenticated all connections
if(count == 0 && numberOfValidConnections > 0) {
// Store the auth details
addAuthSession(self.authStore, new AuthSession(db, username, password, options));
// Return correct authentication
callback(null, true);
} else if(count == 0) {
if(errorObject == null) errorObject = new MongoError(f("failed to authenticate using mongocr"));
callback(errorObject, false);
}
});
}
var _execute = function(_connection) {
process.nextTick(function() {
execute(_connection);
});
}
_execute(connections.shift());
}
}
//
// Initialize step
var GSSAPIInitialize = function(self, db, username, password, authdb, gssapiServiceName, server, connection, options, callback) {
// Create authenticator
var mongo_auth_process = new MongoAuthProcess(connection.host, connection.port, gssapiServiceName, options);
// Perform initialization
mongo_auth_process.init(username, password, function(err) {
if(err) return callback(err, false);
// Perform the first step
mongo_auth_process.transition('', function(err, payload) {
if(err) return callback(err, false);
// Call the next db step
MongoDBGSSAPIFirstStep(self, mongo_auth_process, payload, db, username, password, authdb, server, connection, callback);
});
});
}
//
// Perform first step against mongodb
var MongoDBGSSAPIFirstStep = function(self, mongo_auth_process, payload, db, username, password, authdb, server, connection, callback) {
// Build the sasl start command
var command = {
saslStart: 1
, mechanism: 'GSSAPI'
, payload: payload
, autoAuthorize: 1
};
// Write the commmand on the connection
server(connection, new Query(self.bson, "$external.$cmd", command, {
numberToSkip: 0, numberToReturn: 1
}), function(err, r) {
if(err) return callback(err, false);
var doc = r.result;
// Execute mongodb transition
mongo_auth_process.transition(r.result.payload, function(err, payload) {
if(err) return callback(err, false);
// MongoDB API Second Step
MongoDBGSSAPISecondStep(self, mongo_auth_process, payload, doc, db, username, password, authdb, server, connection, callback);
});
});
}
//
// Perform first step against mongodb
var MongoDBGSSAPISecondStep = function(self, mongo_auth_process, payload, doc, db, username, password, authdb, server, connection, callback) {
// Build Authentication command to send to MongoDB
var command = {
saslContinue: 1
, conversationId: doc.conversationId
, payload: payload
};
// Execute the command
// Write the commmand on the connection
server(connection, new Query(self.bson, "$external.$cmd", command, {
numberToSkip: 0, numberToReturn: 1
}), function(err, r) {
if(err) return callback(err, false);
var doc = r.result;
// Call next transition for kerberos
mongo_auth_process.transition(doc.payload, function(err, payload) {
if(err) return callback(err, false);
// Call the last and third step
MongoDBGSSAPIThirdStep(self, mongo_auth_process, payload, doc, db, username, password, authdb, server, connection, callback);
});
});
}
var MongoDBGSSAPIThirdStep = function(self, mongo_auth_process, payload, doc, db, username, password, authdb, server, connection, callback) {
// Build final command
var command = {
saslContinue: 1
, conversationId: doc.conversationId
, payload: payload
};
// Execute the command
server(connection, new Query(self.bson, "$external.$cmd", command, {
numberToSkip: 0, numberToReturn: 1
}), function(err, r) {
if(err) return callback(err, false);
mongo_auth_process.transition(null, function(err) {
if(err) return callback(err, null);
callback(null, r);
});
});
}
// Add to store only if it does not exist
var addAuthSession = function(authStore, session) {
var found = false;
for(var i = 0; i < authStore.length; i++) {
if(authStore[i].equal(session)) {
found = true;
break;
}
}
if(!found) authStore.push(session);
}
/**
* Remove authStore credentials
* @method
* @param {string} db Name of database we are removing authStore details about
* @return {object}
*/
GSSAPI.prototype.logout = function(dbName) {
this.authStore = this.authStore.filter(function(x) {
return x.db != dbName;
});
}
/**
* Re authenticate pool
* @method
* @param {{Server}|{ReplSet}|{Mongos}} server Topology the authentication method is being called on
* @param {[]Connections} connections Connections to authenticate using this authenticator
* @param {authResultCallback} callback The callback to return the result from the authentication
* @return {object}
*/
GSSAPI.prototype.reauthenticate = function(server, connections, callback) {
var authStore = this.authStore.slice(0);
var count = authStore.length;
if(count == 0) return callback(null, null);
// Iterate over all the auth details stored
for(var i = 0; i < authStore.length; i++) {
this.auth(server, connections, authStore[i].db, authStore[i].username, authStore[i].password, authStore[i].options, function(err) {
count = count - 1;
// Done re-authenticating
if(count == 0) {
callback(err, null);
}
});
}
}
/**
* This is a result from a authentication strategy
*
* @callback authResultCallback
* @param {error} error An error object. Set to null if no error present
* @param {boolean} result The result of the authentication process
*/
module.exports = GSSAPI;
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