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Dealing with CSRF for creating a site in Alfresco 5.1

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There is a webscript in share for creating a site in Alfresco (‘service/modules/create-site’).

In the body of the request you can define :

  • visibility: ‘PUBLIC’, ‘MODERATED’ and ‘PRIVATE’
  • title: The name of the site,
  • shortName: The short name for the site, this parameter will appear in the URL, it should be a valid shortName.
  • description: A description of the site.
  • sitePreset: The template for creating the site, typically ‘site-dashboard’

The problem with using this webscript like that is that you will receive an error:

javax.servlet.ServletException: Possible CSRF attack noted when comparing token in session and request header. Request: POST /share/service/modules/create-site

One possibility is to disable CSRF for any request from a particular trusted server
That methodoly is described in:

http://docs.alfresco.com/5.1/concepts/csrf-policy.html

The second one is to provide an appropriated CSRF header.  To achieve this you will run three HTTP Request in order.

  1. /share/page/dologin POST: This will authenticate you and will give you a session
  2. /share/page/user/admin/dashboard GET : This will give you the CSRF header
  3. /share/service/modules/create-site POST : This finally will create the site. You should put the CSRF in the header ‘alfresco-csrftoken’

It is important to noticed that you have to carry all the cookies from one request to another.

Code example in node Javascript:
———–

var querystring = require('querystring');
var http = require('http');

// BEGIN configuration
var username = 'admin';
var password = 'admin';
var url = 'localhost';
var port = '8080';

var site_title= 'My Site Title';  // name of the site
var site_shortName = 'my_site'; // should be a valid shortName
var site_description = 'This site is an example'; // description of the site
var site_sitePreset = 'site-dashboard"'; //
// END configuration

/**
** login http request
** @param {function} callback function called when request success
*/
function httpRequestLogin(callback) {
  var path = '/share/page/dologin';
  var options = {
    'method': 'POST',
    'hostname': url,
    'port': port,
    'path': path,
    'headers': {
      'content-type': 'application/x-www-form-urlencoded',
      'origin': 'http://' + url + ':' + port,
      'cache-control': 'no-cache'
    }
  };

  var request = http.request(options, function (response) {
    response.on('data', function () {
    });
    response.on('end', function () {
      var cookiesManager = new CookiesManager();
      cookiesManager.addCookies(response);

      if (response.statusCode === 302) {
        callback(cookiesManager);
      } else {
        console.error('error request: ' + path + ' message:' + response.statusCode);
      }
    });
    response.on('error', function (err) {
      console.error('error request: ' + path + ' message:' + response.statusCode);
      console.error(err.stack);
    });
  });

  var query = querystring.stringify({
    username: username,
    password: password,
    success: '/share/page/',
    failure: '/share/page/?error=true'
  });

  request.write(query);
  request.end();
}

/**
** call dashboard http request, it is important to do this query for receiving
** the csrf cookie
** @param {CookiesManager} cookie manager
** @param {function} callback function called when request success
*/
function httpRequestDashboard(cookiesManager, callback) {
  var options = {
    'method': 'GET',
    'hostname': url,
    'port': port,
    'path': '/share/page/user/admin/dashboard',
    'headers': {
      'Cookie': cookiesManager.toString(),
      'origin': 'http://' + url + ':' + port,
      'cache-control': 'no-cache'
    }
  };

  var request = http.request(options, function (response) {
    response.on('data', function () {
    });
    response.on('end', function () {
      cookiesManager.addCookies(response);
      if (response.statusCode === 200) {
        callback(cookiesManager);
      } else {
        console.error('error request: ' + path + ' message:' + response.statusCode);
      }
    });
    response.on('error', function (err) {
      console.error('error request: ' + path + ' message:' + response.statusCode);
      console.error(err.stack);
    });
  });

  request.end();
}

/**
** create site  http request
** @param {CookiesManager} cookie manager
** @param {function} callback function called when request success
*/
function httpRequestCreateSite(cookiesManager, callback) {
  var csrf = cookiesManager.getCookie('Alfresco-CSRFToken');
  csrf = unescape(csrf);

  var options = {
    'method': 'POST',
    'hostname': url,
    'port': port,
    'path': '/share/service/modules/create-site',
    'headers': {
      'Cookie': cookiesManager.toString() ,
      'content-type': 'application/json',
      'alfresco-csrftoken':  csrf,
      'referer': 'http://' + url + ':' + port + '/share/page/user/admin/dashboard',
      'cache-control': 'no-cache',
    }
  };

  var request = http.request(options, function (response) {
    var chunks = [];

    response.on('data', function (chunk) {
      chunks.push(chunk);
    });
    response.on('end', function () {
      var body = Buffer.concat(chunks);
      callback(body.toString());
    });
  });

  var body = JSON.stringify({
    visibility: 'PUBLIC',
    title: site_title,
    shortName: site_shortName,
    description: site_description,
    sitePreset: site_sitePreset,
    siteTemplate: ''
  });

  request.write(body);
  request.end();
}

/**
** cookie Manager class
*/
function CookiesManager() {
  this.arr = {};
}

/**
** add to the current cookies the cookies in the response
** @param {response} http response
*/
CookiesManager.prototype.addCookies = function(response) {
  var this_ = this;

  var cookiesResponse = response.headers['set-cookie'];
  if ( cookiesResponse ) {
    cookiesResponse.forEach(
      function ( cookieStr ) {
        if (cookieStr) {
          var path = cookieStr.split(/[=;]/);
          var name = path[0];
          var value = path[1];
          this_.arr[name] = value;
        }
      }
    );
  }
}

/**
** get cookie value
** @param {string} cookie name
*/
CookiesManager.prototype.getCookie= function(name) {
  return this.arr[name];
}

/**
** concatenate the cookies
*/
CookiesManager.prototype.toString= function() {
  var text = '';
  for (var key in this.arr) {
    if(! this.arr.hasOwnProperty(key)){  continue };

    text += key + '=' + this.arr[key] + '; ';
  }
  return text;
}

// start program
console.log('init program');
httpRequestLogin(function(cookiesManager){
  console.log('finish login');
  httpRequestDashboard(cookiesManager, function(cookiesManager) {
    console.log('finish dashboard');
    httpRequestCreateSite(cookiesManager, function(message) {
      console.log('Create Site Response:');
      console.log(message);
    });
  });
});

 

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