SAML Authentication between Citrix & Microsoft with Azure MFA

As a result of increasing projects, here is a little how to with the summary of my previous articles. The main points are:

  • Azure AD Seamless Single Sign-On (PTA / PHS)
  • SAML Authentication (Azure AD as IdP & Citrix Gateway as SP)
  • Citrix Federated Authentication Service (FAS)
  • Microsoft Azure Multi-Factor-Authentication with Conditional Access

Requirements

  • Fully working Citrix Virtual Apps and Desktop Environment (StoreFront & DDC Minimum Version 7.9)
  • Citrix ADC with successful base configuration & activated Enterprise or Platinum license (Minimum Version 12.1 Build 50+ for native workspace app, for browser Minimum Version 11.1)
  • Configured Unified Gateway vServer
  • Internal and external DNS entries for Unified Gateway vServer (e.g. citrix.deyda.net)
  • Certificates for DNS entries (wildcard certificates are the easiest)
  • Existing Azure Tenant with Azure-AD base configuration (Domain, AAD Sync) & activated Azure AD Premium license
  • AD Connect version installed and configured (Minimum Version 1.1.644.0)
  • Firewall release for *.msappproxy.net on port 443
  • Domain administrator credentials for the domains that connected to Azure AD via AD Connect
  • Installed Authenticator App on Test User Mobile Phone
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ADV190023 – Enable LDAPS in Windows DC and Citrix ADC

Important Info:
The scheduled update (ADV190023), regarding LDAP Signing and Channel Binding for new and existing domain controllers, scheduled for March 10, 2020, has been postponed to the second half of calendar year 2020. The March 2020 update will only provide additional auditing capabilities to identify and configure LDAP systems before they become inaccessible with the later update.

The later update results in no more connections to the domain controller, via unsigned / Clear Text LDAP on port 389. Then it is only possible to use either LDAPS via port 636 or Signed LDAP (StartTLS) on port 389.

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Checklist for Citrix ADC CVE-2019-19781

Citrix has released a critical vulnerability warning (CVE-2019-19781) in all Citrix ADC & Gateway systems one week before Christmas. Several working exploits have been released since Jan. 10, 2020 and are available to everyone.

Important ! The fix from Citrix with the Responder Policy does not work on systems with version 12.1.51.16/51.19, 50.31 and older. If this version is in use, please update to the latest 12.1 version.

The exploits allow remote code to be executed anonymously, allowing unauthenticated attackers to take over the various machines with root privileges.

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Update to Virtual Apps and Desktops Version 1912 LTSR

On December 18, Citrix Virtual Apps and Desktops (CVAD) version 1912 was released. Following a little guide to the update to the latest version.

Link to Citrix Virtual Apps and Desktops Documentation

Citrix Virtual Apps and Desktops EOM EOL Matrix
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Update to Virtual Apps and Desktops Version 1909

On September 19, Citrix Virtual Apps and Desktops (CVAD) version 1909 was released. Following a little guide to the update to the latest version.

Link to Citrix Virtual Apps and Desktops Documentation

Citrix Virtual Apps and Desktops EOM EOL Matrix
Continue reading “Update to Virtual Apps and Desktops Version 1909”