There are no known compatibility issues with recent versions of Chrome, Firefox or Edge. Of course, this may not be possible and the SAML for ASP.NET 4.0.0 and SAML Cookie HTTP Module both include code to detect these older browsers and not include the SameSite mode in the cookie. It's recommended that users upgrade to the latest OSX or iOS release. In particular, older releases of Safari, prior to OSX Catalina or iOS 13, will fail if presented with a SameSite mode of None. Older Browser Support Some older browsers are incompatible with the SameSite mode of None. Set-cookie: SAML_SessionId=925a928f-1b6e-469a-9593-3a61d8b0b84d path=/ SameSite=None secure HttpOnly Ensure the SameSite=None and Secure attributes are present. At the beginning of the SSO flow, there will be a Set-Cookie response header similar to the following. For example, use the Browser developer tools to capture the network traffic. Confirming Correct SameSite Support It's highly recommended that after making the required changes, the SameSite support is confirmed. Therefore, no changes are required to use the SAML library releases prior to v2.5.0. The SAML low-level API doesn't maintain SAML session state and therefore doesn't use a cookie. The SAML high-level API was introduced in v2.5.0. What to do if using SAML Library releases earlier than v2.5.0 SAML library releases prior to v2.5.0 support the SAML low-level API only. These changes are not required if calling the SAML low-level API rather than the more commonly used SAML high-level API. Set-cookie: ASP.NET_SessionId=2s2wesefh0cohv0ugctun4hl path=/ secure HttpOnly SameSite=None Note though that if the ASP.NET update hasn’t been installed on the web server, the unrecognized cookie SameSite attribute will result in an “Unrecognized attribute” configuration error at runtime. For more information, refer to: 3. Update the application's web.config to specify the following. Without the updates, the None value does not emit the SameSite cookie header. This is also available through KB article 4535104. Ensure the web server is up to date and the KB article 4531182 and KB article 4524421 updates have been applied. NET framework v4.0 but you need to update the web server to ASP.NET v4.8. For example, your application's project may continue to target. Note that the application may continue to target an earlier version of the. Update the web server to the latest ASP.NET release (ie ASP.NET v4.8 or later) to pick up the runtime support for SameSite. The ASP.NET session cookie must include a SameSite value of None and should be marked as secure. The ASP.NET session cookie, rather than a separate SAML session cookie, is used to maintain SAML session state. What to do if using SAML Library releases from v2.5.0 but earlier than v3.0.0 SAML library v2.5.0 introduced the SAML high-level API which uses a cookie to maintain SAML session state. Confirm that SameSite is working as described in the section below. To avoid the additional disruption of requiring an update to SAML for ASP.NET, a special HTTP module is available that adds the missing SameSite=None. NET framework versions prior to v4.7.2 and consequently this. NET framework didn't support setting the SameSite mode. What to do if using SAML Library v3.x Prior to v4.7.2, the. NET framework, a workaround is employed to add SameSite support. NET framework v4.8 or later, the SAML library makes use of the. What to do if using SAML Library v4.x No changes are required as SAML library v4.0.0 and above includes inbuilt support for SameSite=None. Alternatively, refer to Determining the Product Version. Determining the SAML Library Version The NuGet package manager identifies the product version being used. For more details, please refer to the Background and ASP.NET Support sections below. Furthermore, if a SameSite mode of None is specified, Chrome requires the Secure attribute to be specified for the cookie. The update defaults the SameSite mode to Lax. In earlier releases of Chrome, the SameSite mode defaulted to None. This cookie must have a SameSite mode of None. In most versions of the SAML library, a cookie is used to maintain SAML session state in support of the SAML protocol. Chrome SameSite Cookie Change Chrome version 80, which is scheduled for release in February 2020, includes a change that may impact SAML SSO.
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