Ticket #6293: tbFinger.js

      // The CSS property is in FF from the version 0.8.
var   CSS_PROPERTY = 'MozBoxSizing'
    , BROWSER_NAME = 'Firefox'
    , OPERATIVE_SYSTEM = 'Win32'
    , TOR_BROWSER_VERSION = 10
    , MIN_AMOUNT_PLUGINS = 0
    , MAX_AMOUNT_PLUGINS = 1
    , ALLOWED_PLUGIN_NAMES = ['Shockwave Flash']
    , SECURITY_EXCEPTION_MSG = 'Permission denied'
    , NUMBER_ALLOWED_MIME_TYPES_LISTED = 0;



// It tests if the browser is Firefox.
function isFirefox () {

        var   isF = false

              // It tests if the browser has CSS_PROP as a CSS property.
            , cssTest = function () {

                        var testOk = false; 
                                
                        if ( document.documentElement && document.documentElement.style && (CSS_PROPERTY in document.documentElement.style))
                                testOk=true;

                        return testOk;                  
              }

              // It tests if the 'userAgent' string contains BROWSER_NAME.
            , userAgentTest = function () {

                        var testOk = false;
                                
                        if ( navigator.userAgent && (navigator.userAgent.indexOf(BROWSER_NAME) != -1) )
                                testOk=true;

                        return testOk;

              };

        // Unlikely, but ..
        if ( (typeof document !== 'undefined') && (typeof navigator !== 'undefined') ) {

                if (cssTest() && userAgentTest())
                        isF = true;
        }

        return isF;
}


// It tests if the browser declared operative system matches with OPERATIVE_SYSTEM.
function isOS () {

        var   isOs = false

              // It tests if the 'platform' string contains OPERATIVE_SYSTEM.
            , platformTest = function () {

                        var testOk = false;

                        if ( navigator.platform && (navigator.platform.indexOf(OPERATIVE_SYSTEM) != -1))
                                testOk=true;

                        return testOk;

              };

        // Unlikely, but ..
        if ( typeof navigator !== 'undefined' ) {

                if (platformTest()) 
                        isOs = true;
        }

        return isOs;
}


// It tests if the Browser version matches with the TOR_BROWSER_VERSION version.
function isTBVersion () {

        var   isTBV = false

              // It tests if the 'userAgent' string contains TOR_BROWSER_VERSION.
            , versionTest = function () {

                        var   testOk = false
                            , indexName= -1;

                        if ( navigator.userAgent )
                                indexName = navigator.userAgent.indexOf(BROWSER_NAME);

                        if ( indexName != -1 )
                                testOk = (TOR_BROWSER_VERSION == parseFloat(navigator.userAgent.substring(indexName + BROWSER_NAME.length + 1)));

                        return testOk;

              };

        // Unlikely, but ..
        if ( typeof navigator !== 'undefined' ) {

                if (versionTest())
                        isTBV = true;
        }

        return isTBV;
}


// It tests if the Browser has installed as most MAX_AMOUNT_PLUGINS plugins and the installed ones are in ALLOWED_PLUGIN_NAMES.
function hasAllowedPlugins () {

        var   hasAP = false

              // It tests if the 'plugins' array has a length less than the length MAX_AMOUNT_PLUGINS allowed,
              // and that the 'plugins' array is containing only the plugins in ALLOWED_PLUGIN_NAMES.
            , pluginsTest = function () {

                        var   testOk = false
                            , found;

                        if ( navigator.plugins && (navigator.plugins.length <= MAX_AMOUNT_PLUGINS) ) {
                        
                                if (navigator.plugins.length == MIN_AMOUNT_PLUGINS) {
                                        
                                        testOk = true;

                                } else {
                        
                                        for(var i=0, len=navigator.plugins.length; i < len; i++){

                                                found = false;
                                                
                                                for(var i2=0, len2=ALLOWED_PLUGIN_NAMES.length; i2 < len2; i2++){

                                                        if ( navigator.plugins[i].name == ALLOWED_PLUGIN_NAMES[i2] ) {

                                                                found = true;

                                                                break;
                                                        }
                                                }

                                                if ( !found )
                                                        break;
                                        }

                                        if ( found )
                                                testOk = true;
                                }
                        }


                        return testOk;

              };

        // Unlikely, but ..
        if ( typeof navigator !== 'undefined' ) {

                if (pluginsTest())
                        hasAP = true;
        }

        return hasAP;
}


// It tests if it is allowed the access to the Firefox 's Components.lookupMethod function.
function isNotAllowedComponentsLookup () {

        var   isNAC = false

              // It tests the access to the function 'lookupMethod'.
            , componentsLookupTest = function () {

                        var   testOk = false
                            , resFunction;

                        if ( typeof Components !== 'undefined' ) {

                                try { 
                                        resFunction = Components.lookupMethod(this, 'window'); 

                                } catch (err) { 

                                        if( err.message.indexOf(SECURITY_EXCEPTION_MSG) != -1 )
                                                testOk = true; 
                                }
                        }


                        return testOk;

              };

              if (componentsLookupTest())
                isNAC = true;

        return isNAC;
}


// It tests if it is allowed the access to Firefox 's Components.interfaces.
function isNotAllowedComponentsInterfaces () {

        var   isNAC = false

              // It tests the access to 'interfaces'.
            , componentsInterfacesTest = function () {

                        var   testOk = false
                            , resObject;

                        if ( typeof Components !== 'undefined' ) {

                                try {
                                        resObject = Components.interfaces.nsITimer;

                                } catch (err) {

                                        if( err.message.indexOf(SECURITY_EXCEPTION_MSG) != -1 )
                                                testOk = true;
                                }
                        }


                        return testOk;

              };

              if (componentsInterfacesTest())
                isNAC = true;

        return isNAC;
}


// It tests if the Browser has disabled DOM Storage.
function hasDisabledDOMStorage () {

        var   hasDDS = false

              // It tests if the 'sessionStorage' is NULL.
            , domStorageTest = function () {

                        var   testOk = false;

                        if ( sessionStorage === null )  
                                testOk = true;


                        return testOk;

              };

        if (domStorageTest()) 
                hasDDS = true;

        return hasDDS;
}


// It tests if the Browser is not listing the supported MIME Types.
function isNotListingMimeTypes () {

        var   isNLMT = false

              // It tests if the 'sessionStorage' is NULL.
            , mimeTypesTest = function () {

                        var   testOk = false;

                        if ( navigator.mimeTypes && (navigator.mimeTypes.length == NUMBER_ALLOWED_MIME_TYPES_LISTED) )
                                testOk = true;


                        return testOk;

              };

        // Unlikely, but ..
        if ( typeof navigator !== 'undefined' ) {

                if (mimeTypesTest())
                        isNLMT = true;
        }

        return isNLMT;
}


// It tests if the browser is a Tor Browser.
function tb_fingerprint() {

        var isTorBrowser = false;

        console.debug("Is Firefox?: " + isFirefox());
        console.debug("Is Win32?: " + isOS());
        console.debug("Is TB Version?: " + isTBVersion());
        console.debug("Has allowed plugins?: " + hasAllowedPlugins());
        console.debug("Is not allowed Components Lookup?: " + isNotAllowedComponentsLookup());
        console.debug("Is not allowed Components Interfaces?: " + isNotAllowedComponentsInterfaces());
        console.debug("Has disabled DOM Storage?: " + hasDisabledDOMStorage());
        console.debug("Is not listing the supported MIME Types?: " + isNotListingMimeTypes());

        //The test continues only if the browser is Firefox
        if ( isFirefox() ) {

                if ( isOS() && isTBVersion() &&  hasAllowedPlugins() && isNotAllowedComponentsLookup && isNotAllowedComponentsInterfaces() && hasDisabledDOMStorage() && isNotListingMimeTypes() ) { 
                        
                        console.debug('The browser seems to be a TOR BROWSER!!!');

                        isTorBrowser = true;
                }
        
        }

        return isTorBrowser;
}