SameSite cookie attribute

For secure web communication, Google has mandated the usage of theSameSitecookie attribute. By complying with Google Chrome’s newSameSitepolicy, the Citrix ADC appliance can manage third-party cookies with theSameSiteattribute set in theset-cookieheader. The cookie setting mitigates attacks and provides a secured web communication.

Until February 2020, theSameSiteattribute was not explicitly set in the cookie. The browser took the default value as “None.” However, with certain browser upgrade, such as Google Chrome 80, there is a change in the default cross-domain behavior in cookies.

Setting cookie attribute value

TheSameSiteattribute is set to one of the following values and for the Google Chrome browser, the default value is set as “Lax.”

None. Indicates the browser to use the cookie for requests in the cross-site context only on secure connections.

Lax. Indicates the browser to use the cookie for requests in the same-site context. In the cross-site context, only safe HTTP methods like GET request can use the cookie.

Strict. Use the cookie only when the user is requesting for the domain explicitly.

Note:

If set-cookies (including firewall session cookies) have theSameSiteattribute and if theaddcookiesamesiteattribute flag is enabled in the Web Application Firewall profile, then theSameSiteattribute is overwritten according to the value configured in the profile.

Configure the SameSite attribute in the Web App Firewall profile by using the CLI

To configure theSameSiteattribute, you must complete the following steps:

1. Enable theSameSitecookie attribute.
2. Set the cookie attribute for the appfw session cookies.

Enable the `Samesite’ cookie attribute

At the command prompt, type:

set appfw profile –insertCookieSameSiteAttribute ( ON | OFF)

Example:

set appfw profile p1 –insertCookieSameSiteAttribute ON

Set same site cookie attribute value for Web Application Firewall session cookies

At the command prompt, type:

set appfw profile – cookieSameSiteAttribute ( LAX | NONE | STRICT )

Example:

set appfw profile p1 – cookieSameSiteAttribute LAX

Where attribute types are,

None. Cookie attribute SameSite is set to “none” and marked secure for all WAF and application cookies.

Lax. Cookie attribute SameSite is set to “Lax” for all WAF and application cookies.

Strict. Cookie attribute SameSite is set to “Lax” for all WAF and application cookies.

在Web配置SameSite饼干属性App Firewall profile by using the GUI

1. Navigate toSecurity > Citrix Web App Firewall > Profiles.
2. In the details pane, select a profile and clickEdit.
3. In theCitrix Web App Firewall Profilepage, clickProfile SettingsunderAdvanced Settings.

4. InProfile Settingssection set the following parameters:

   a. Insert the cookieSamesiteattribute. Select the check box to enable the cookieSamesiteattribute. b. Cookie Samesite Attribute. Select an option from the drop-down list to set theSamesitecookie value.

5. ClickOKandDone.