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SameSite cookie attribute
For secure web communication, Google has mandated the usage of the SameSite cookie attribute. By complying with Google Chrome’s new SameSite policy, the Citrix ADC appliance can manage third-party cookies with the SameSite attribute set in the set-cookie header. The cookie setting mitigates attacks and provides a secured web communication.
Until February 2020, the SameSite attribute 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
The SameSite attribute 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 the
SameSiteattribute 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 the SameSite attribute, you must complete the following steps:
- Enable the
SameSitecookie attribute. - Set the cookie attribute for the appfw session cookies.
Enable the `Samesite’ cookie attribute
At the command prompt, type:
set appfw profile <profile-name> –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 <profile-name> – 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.
Configure the SameSite cookie attribute in the Web App Firewall profile by using the GUI
- Navigate to Security > Citrix Web App Firewall > Profiles.
- In the details pane, select a profile and click Edit.
- In the Citrix Web App Firewall Profile page, click Profile Settings under Advanced Settings.
-
In Profile Settings section set the following parameters:
a. Insert the cookie
Samesiteattribute. Select the check box to enable the cookieSamesiteattribute. b. Cookie Samesite Attribute. Select an option from the drop-down list to set theSamesitecookie value. - Click OK and Done.
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