Extension of the existing article with further troubleshooting cases.
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
Continue reading “SAML Authentication between Citrix & Microsoft with Azure MFA”
- 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
For quite some time (Beginning of 2017) it is now possible to solve SSO scenarios with Azure even without ADFS infrastructure. However, it is only recently that companies has started to not insist on ADFS. Now one may finally also point out the alternative solutions of Microsoft.
The possible scenarios for Seamless SSO are:
- Pass-through authentication (PTA)
- Password Hash Sync (PHS)
Pass-through authentication (PTA)
- No automatic detection of leaked login data
- Azure AD DS requires enabled Password Hash Synchronization feature in tenant to work
- Is not part of Azure AD Connect Health
Password Hash Sync (PHS)
Continue reading “Activation of Azure AD Seamless Single Sign-On”
- Password is synchronized to the cloud (as hash value)
Since Citrix XenApp / XenDesktop 7.9 the Federated Authentication Service (FAS) is available. Via Citrix FAS it is possible to authenticate a user via SAML and thus connect Citrix as a service provider to existing identity providers, such as Azure-AD.
Sequence of SAML authentication
Continue reading “SAML Authentication with Azure AD as IdP and Citrix as SP”
- The user browse the FQDN (e.g. citrix.deyda.net) of the Citrix Gateway vServer (Service Provider) to start his VA / VD resources
- The Citrix Gateway vServer directs the unauthenticated user directly to the Identity Provider (Azure-AD) to authenticate itself (saml: authnRequest)
- The Identity Provider points to its SingleSignOnService URL (e.g. login.microsoftonline.com) and the user must authenticate
- The user enters his AD credentials and these are checked by the Identity Provider against the user database
- Upon successful verification in the user database, the IdP is informed
- The IdP issues a token (SAML assertion) and sends it to the Citrix Gateway (saml: response)
- Citrix Gateway checks the token (assertion signature) and extracts the UPN from the assertion token. This allows access via SSO to the VA / VD farm via FAS (The SP does not have access to the user’s credentials)
This article is about creating an AD FS Proxy from Citrix ADC (version 12). The AD FS Proxy is used to authenticate e.g. external SaaS applications or websites via AD FS. The following should be achieved by the AD FS Proxy:
- URL / DoS Protection
- Suitable external authentication (MFA, Forms instead of Kerberos)
- Account Lockout Protection
- Availability (Load Balancing)
What is AD FS ?
Active Directory Federation Services (AD FS) is a feature in the Windows Server operating system that allows identity information to be shared outside of the corporate network. Users can access applications (e.g. Office365, Salesforce.com, etc.) without being prompted to provide credentials again. These applications can be hosted locally, in the cloud, or even by other companies. The user accounts can be managed by the administrator in a single location, the Active Directory.
A normal deployment of AD FS for external clients consists of AD FS Proxy and AD FS Server. The AD FS Server is a member of the domain and perform the authentication. The AD FS Proxy is usually located in a separate network zone (DMZ) so that it can be reached externally and forward the requests inwards.
Continue reading “Citrix ADC as AD FS Proxy”
This article is about setting up SAML authentication for Office365 through the Citrix ADC (version 12). The Citrix ADC serves as IdP and Office365 as SP. So that you do not have to enter your user name a hundred times, this is prevented by an initial IdP (SSO).
In short, the important upcoming terms explained.
SAML (Security Assertion Markup Language) provides a common platform for web-based access to multiple, autonomous services without the need to reenter multiple credentials. Authentication takes place via an encrypted session cookie, transparent in the background. This session cookie, which is provided with an expiration date, is given to the user in the browser by an authentication service (Identity Provider – IdP) and can then subsequently use all connected services (Service Provider – SP) in the browser.
Continue reading “Citrix ADC as initial IdP for Office365”