A to Z: A Deployment Guide for Citrix XenApp in Azure | Citrix Blogs Deploying Citrix XenApp in Microsoft Azure is a hot topic for many. Citrix XenApp - RSA SecurID Access Standard Agent Implementation Guide - Presentation Server Deployment Guide. Preface 3 before it is routed to the Citrix Presentation Server application servers, including load balancing. USED WORKBENCH
For the testing in this article, the Premium performance tier was used with a 10 GiB share hosting the containers. Configure Profile Management through Citrix Studio. Choose one place for which it is configured—and not configure it in multiple places. If you chose Microsoft Group Policy, make sure that you periodically update the ADMX template to make sure you have access to the latest features.
Citrix Profile Management is designed to remove profile bloat and significantly speed logon times, while reducing profile corruption. Together, these configuration settings help to ensure a better user experience for Outlook on Citrix Virtual Apps with Microsoft Exchange Online. The later versions of CPM enable profile streaming by default on Citrix servers.
This technology prevents the entire user profile from being downloaded to the Citrix host at logon. Instead, only a list of the files residing on the profile are enumerated and that list is available to the operating system. When a file is requested, then it is fetched from the user store and brought to the Citrix host. This process reduces the number of file copies that happen at logon and improves the user logon experience.
This behavior affects Outlook users because some Outlook data. PST, and. PAB files is created in non-roaming folders. This is due to these files being large and hindering roaming profile performance. Follow the guidelines below to reduce troubleshooting:. When using Cached Exchange Mode, the. OST file can grow large. Use the Enable native Outlook search experience to feature instead.
OST and the Microsoft search database specific to the user roam along with the user profile. This feature improves the user experience when searching mail in Microsoft Outlook. A step by step guide on how to turn on the Outlook search experience can be found here.
Make sure to consider this when sizing the user store. To increase the stability of the Enable search index roaming for Outlook feature, Profile Management saves a backup of the last known good copy of the search index database in case it becomes corrupted. Citrix recommends the following two policies see image below to be configured within Citrix Studio:.
User layers allow profile settings, data, and locally installed applications in a non-persistent VDI environment to persist. Every user gets an assigned a user layer at logon where their changes are written. This is created the first time the logon and gets mounted to their session using Citrix App Layering Elastic layering technology. The following user layers are available:. User personalization layers offer user-based customizations in non-persistent virtual environments. User layers provide users with an experience that mimics that of a dedicated desktop while offering the management and cost savings of a non-persistent Windows image.
Make sure that there is enough bandwidth and enough storage space allocated for the user layer. More information on requirements and how to configure user layers can be found here. This is the only Microsoft-endorsed solution for delivering Skype for Business in a virtual environment.
Following are a couple of considerations to think about when delivering Skype for Business in a virtualized environment:. Our optimization for Microsoft Teams allows the endpoint to decode and render the media locally. Following are a couple of recommendations and things to consider when deploying Microsoft Teams in a virtual environment:.
More information on system requirements, on recommended exclusions, network requirements, and process flow information can be found here. Included with the Microsoft subscription is access to OneDrive for Business, allowing a user to store, sync, and share their work files. OneDrive for Business lets users update and share files from anywhere and work on Office documents with others at the same time.
OneDrive installation must be done as a per-machine install for multi-session VDAs. To install OneDrive in per-machine mode, use the following command-line:. By default, the OneDrive Sync application is configured to automatically update itself. To prevent the OneDrive Sync application from updating automatically, complete the following tasks:. Typically, with Microsoft , users are allowed to download the applications on up to 5 devices. In a Virtual Apps and Desktop deployment, this would not work as users are connecting to different back-end VMs every time they logon.
For virtual environments, shared computer activation needs to be enabled. When using the Shared Computer Activation approach, the following occurs:. Microsoft Business premium is the only business plan that includes support for shared computer activation. More information on Microsoft with Shared Computer Activation can be found here.
It does this by automating the implementation of Microsoft Office Network Connectivity Principles. These principles provide a combined set of information to optimize network routes, firewall rules, browser proxy settings, and bypass of network inspection devices for certain endpoints. With this information deployed to a deep packet inspection engine, Citrix SD-WAN appliances automatically identify M application flows, resolve the nearest service POP, and direct endpoint sessions to it.
This ensures minimal latency and maximum user experience for the M application. For more information see M Optimization. For more information on the lab configurations in the test environment, see the Appendix. One of the scenarios tested included using the search function within Outlook, since the search index is user specific and needs to roam with the user.
When Outlook is used and the outbound internet is not available, due to proxy or configuration errors, the search cache is no longer accessible. When the Outlook client is working offline, any search requests are slow since Outlook needs to build the index database.
As mentioned earlier all user data storage for the non-persistent sessions was stored on a single Azure Files 10 TiB premium file share. Metrics were manually recorded for the Logon and Log off times. The results of the testing are shown in the table below:. Each of these profile configurations comes with caveats to consider before deploying and are discussed below.
FSLogix supports two types of containers: office and profile. Each container can be enabled and configured separately and servers a different purpose. The container VHDs took only a few seconds to attach during logon.
When only the office container was enabled, we saw logons averaging between 12 and 14 seconds. With both containers, the average logon times jumped to between 23 and 24 seconds. The office and profile containers are stored in separate VHD files. In our testing, the users had a 4. After logon and logoff testing was complete, the office container had grown to 6.
Which means for 4. The profile container is more of an optional container. So on multi-session hosts, the search index database can follow the user. For more information on how Citrix Profile Manager was configured in the lab test environment, see the Appendix B. During the testing, the logon times with CPM profiles using a combination of folder redirection and Profile Management were fairly normal and provided a good user experience. When CPM is used, users with multiple simultaneous sessions, such running application sessions across different hosts, will have their changes saved to the pending folder and not written to the profile until logoff, protecting against the last-write wins data loss scenario.
The one downside to this behavior is that if users log off and then attempt to log on again quickly, they receive a temporary profile. So the service eventually times out and opts for a temporary profile. This profile configuration represents a hybrid approach with the two technologies.
However, when deploying traditional CPM profiles with FSLogix containers, do not enable the large file handling feature. If deploying resources in different domains, install Cloud Connectors in each user domain. As indicated in the migration methodologies section, the migration steps discussed in this guide use the Automated Configuration tool. Follow the steps in the Automated Configuration tool steps from the section linked here. Once the migration of the control layer is complete and verification is done, return here and continue with the following steps.
Once the Automated Configuration tool has been run, then the machines hosting resources running VDAs must be configured to register with the Cloud Connectors. Take a new snapshot and update the machine catalog with the new snapshot. On the right pane, select New under Citrix Computer Policies. Set the Enable auto update of Controller option to Allowed. Although auto-update is not used for initial registration, the auto-update downloads and stores the ListOfDDCs in a persistent cache on the VDA when initial registration occurs.
This process is done on each resource machine running a VDA. Refer to the VDA registration product documentation for additional details on how auto-update works and its exceptions. On the Filters page, select the Delivery Group s on which this policy needs to be applied. Check the Enable this policy check box and click Create to complete the policy creation.
Once the Group Policy setting is updated, the machines start to register with the Cloud Controllers. With everything ready the configuration of the access layer can be performed. One of the three options discussed in the earlier sections are possible. To configure access via the Citrix Workspace and Citrix Gateway services navigate to Workspace Configuration from the hamburger menu on the top left of the Citrix Cloud console.
The first part of the workspace URL is customizable. Enable connectivity using the Gateway service by clicking the ellipses for the desired resource location and selecting Configure Connectivity. Perform this step and the following steps for each resource location that is being migrated. The Authentication tab allows for configuration of the authentication mechanism.
Choose the desired method. The Customize tab in Workspace Configuration allows you to customize the Workspace appearance and preferences. Users can now login to the Workspace URL that was configured and login to the Workspace for accessing the on-premises resources. Connect to the on-premises Citrix ADC from a browser and login as an administrator.
Click Retrieve Stores. Complete the configuration of the Gateway, no need to provide Authentication and session policy details. To configure access via the Citrix Workspace service, login to Citrix Cloud and navigate to Workspace Configuration from the hamburger menu on the top left of the Citrix Cloud console. Enable connectivity using the on-premises Gateway by clicking the ellipses for the desired resource location and selecting Configure Connectivity.
Once it passes. Click Save. For more information, see CTX If you are creating a new store add the Cloud Connectors on the Delivery Controllers page. Enable the Remote Access option to integrate the Store service with the on-premises Gateway to enable external access for this store. Configure the trusted domain for authentication and apply the customizations required as per the organization requirements. For external access, we need to verify the Security Ticket Authority details.
If not added in previous steps add those details now. Now configure the on-prem Gateway. Perform the first 3 steps in the on-premises Gateway configuration in the preceding section. Once done, return here and follow the remaining steps. Configure the Session Policies to complete the gateway configuration. Also, apply the necessary themes with the required customization. On-premises StoreFront and Gateway configuration are successfully completed.
The users can now seamlessly access their resources as they used to before the migration using the StoreFront URL. Request a trial of Citrix Virtual Apps and Desktops service, click here. Try the Automated Configuration tool, click here. Citrix Virtual Apps and Desktops service product documentation. Cloud Connector connectivity requirements. Cloud Connector sizing guide. Cloud Connector Technical Details. Deployment scenarios for Cloud Connector with Active Directory domains.
Cloud Connector installation. Citrix Cloud Identity and Access Management. Automated Configuration tool POC guide. Machine Catalog creation and types. Cloud Connector Updates. The development, release and timing of any features or functionality described in the Preview documentation remains at our sole discretion and are subject to change without notice or consultation.
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Traffic is distributed among virtual machines defined in a load-balancer set. A load balancer can be external or internet-facing, or it can be internal. These IP addresses serve as ingress for the traffic. Rather, it is an extra IP address that can be used to connect directly to a virtual machine or role instance. Inbound NAT Rules — This contains rules mapping a public port on the load balancer to a port for a specific virtual machine in the back-end address pool. Load Balancing Rules — A rule property that maps a given front-end IP and port combination to a set of back-end IP addresses and port combinations.
With a single definition of a load balancer resource, users can define multiple load balancing rules, each rule reflecting a combination of a front-end IP and port and back end IP and port associated with virtual machines. NSGs can be associated with either subnets or individual virtual machine instances within that subnet. In addition, traffic to an individual virtual machine can be restricted further by associating an NSG directly to that virtual machine. Private IP addresses — Used for communication within an Azure virtual network, and user on-premises network when a VPN gateway is used to extend a user network to Azure.
Private IP addresses allow Azure resources to communicate with other resources in a virtual network or an on-premises network through a VPN gateway or ExpressRoute circuit, without using an Internet-reachable IP address. In the Azure Resource Manager deployment model, a private IP address is associated with the following types of Azure resources — virtual machines, internal load balancers ILBs , and application gateways.
Probes — This contains health probes used to check availability of virtual machines instances in the back-end address pool. If a particular virtual machine does not respond to health probes for some time, then it is taken out of traffic serving. Probes enable users to keep track of the health of virtual instances.
If a health probe fails, the virtual instance is taken out of rotation automatically. Region - An area within a geography that does not cross national borders and that contains one or more data centers. Pricing, regional services, and offer types are exposed at the region level. A region is typically paired with another region, which can be up to several hundred miles away, to form a regional pair.
Regional pairs can be used as a mechanism for disaster recovery and high availability scenarios. Also referred to generally as location. Resource Group - A container in Resource Manager that holds related resources for an application. The resource group can include all of the resources for an application, or only those resources that are logically grouped. Storage Account — An Azure storage account gives users access to the Azure blob, queue, table, and file services in Azure Storage.
A user storage account provides the unique namespace for user Azure storage data objects. Virtual Machine — The software implementation of a physical computer that runs an operating system. Multiple virtual machines can run simultaneously on the same hardware. In Azure, virtual machines are available in various sizes. Virtual Network - An Azure virtual network is a representation of a user network in the cloud.
It is a logical isolation of the Azure cloud dedicated to a user subscription. Users can fully control the IP address blocks, DNS settings, security policies, and route tables within this network. Also, users can connect the virtual network to their on-premises network using one of the connectivity options available in Azure.
In essence, users can expand their network to Azure, with complete control on IP address blocks with the benefit of the enterprise scale Azure provides. It must be installed in a location where it can intercept traffic between the web servers that users want to protect and the hub or switch through which users access those web servers. Users then configure the network to send requests to the Web Application Firewall instead of directly to their web servers, and responses to the Web Application Firewall instead of directly to their users.
The Web Application Firewall filters that traffic before forwarding it to its final destination, using both its internal rule set and the user additions and modifications. It blocks or renders harmless any activity that it detects as harmful, and then forwards the remaining traffic to the web server. The figure above Figure 1 provides an overview of the filtering process.
Note: The figure omits the application of a policy to incoming traffic. It illustrates a security configuration in which the policy is to process all requests. Also, in this configuration, a signatures object has been configured and associated with the profile, and security checks have been configured in the profile.
As the figure shows, when a user requests a URL on a protected website, the Web Application Firewall first examines the request to ensure that it does not match a signature. If the request matches a signature, the Web Application Firewall either displays the error object a webpage that is located on the Web Application Firewall appliance and which users can configure by using the imports feature or forwards the request to the designated error URL the error page.
If a request passes signature inspection, the Web Application Firewall applies the request security checks that have been enabled. The request security checks verify that the request is appropriate for the user website or web service and does not contain material that might pose a threat.
For example, security checks examine the request for signs indicating that it might be of an unexpected type, request unexpected content, or contain unexpected and possibly malicious web form data, SQL commands, or scripts. If the request fails a security check, the Web Application Firewall either sanitizes the request and then sends it back to the Citrix ADC appliance or Citrix ADC virtual appliance , or displays the error object. If the request passes the security checks, it is sent back to the Citrix ADC appliance, which completes any other processing and forwards the request to the protected web server.
When the website or web service sends a response to the user, the Web Application Firewall applies the response security checks that have been enabled. The response security checks examine the response for leaks of sensitive private information, signs of website defacement, or other content that should not be present. If the response fails a security check, the Web Application Firewall either removes the content that should not be present or blocks the response.
If the response passes the security checks, it is sent back to the Citrix ADC appliance, which forwards it to the user. Compared to alternative solutions that require each service to be deployed as a separate virtual appliance, Citrix ADC on Azure combines L4 load balancing, L7 traffic management, server offload, application acceleration, application security, and other essential application delivery capabilities in a single VPX instance, conveniently available via the Azure Marketplace.
Furthermore, everything is governed by a single policy framework and managed with the same, powerful set of tools used to administer on-premises Citrix ADC deployments. Customers would potentially deploy using three-NIC deployment if they are deploying into a production environment where security, redundancy, availability, capacity, and scalability are critical.
With this deployment method, complexity and ease of management are not critical concerns to the users. Customers would deploy using ARM Azure Resource Manager Templates if they are customizing their deployments or they are automating their deployments. All of the templates in this repository have been developed and maintained by the Citrix ADC engineering team. Each template in this repository has co-located documentation describing the usage and architecture of the template. Most templates require sufficient subscriptions to portal.
These templates increase reliability and system availability with built-in redundancy. Choice of selection is either mentioned in the template description or offered during template deployment. Through the Azure Marketplace. VPX virtual appliances on Azure can be deployed on any instance type that has two or more cores and more than 2 GB memory.
The following ARM templates can be used:. A security group must be created for each subnet. This is achieved by configuring a health probe on ALB, which monitors each VPX instance by sending health probes at every 5 seconds to both primary and secondary instances. In this setup, only the primary node responds to health probes and the secondary does not. Once the primary sends the response to the health probe, the ALB starts sending the data traffic to the instance.
If the primary instance misses two consecutive health probes, ALB does not redirect traffic to that instance. On failover, the new primary starts responding to health probes and the ALB redirects traffic to it. The standard VPX high availability failover time is three seconds. The total failover time that might occur for traffic switching can be a maximum of 13 seconds.
All traffic goes through the primary node. The secondary node remains in standby mode until the primary node fails. The template creates two nodes, with three subnets and six NICs. The subnets are for management, client, and server-side traffic, and each subnet has two NICs for both of the VPX instances. Complete the following steps to launch the template and deploy a high availability VPX pair, by using Azure Availability Sets.
The Basics page appears. Create a Resource Group and select OK. The General Settings page appears. Type the details and select OK. The Network Setting page appears. Check the VNet and subnet configurations, edit the required settings, and select OK.
The Summary page appears. Review the configuration and edit accordingly. Select OK to confirm. The Buy page appears. Select Purchase to complete the deployment. It might take a moment for the Azure Resource Group to be created with the required configurations.
After completion, select the Resource Group in the Azure portal to see the configuration details, such as LB rules, back-end pools, health probes, and so on. The high availability pair appears as ns-vpx0 and ns-vpx1. If further modifications are required for the HA setup, such as creating more security rules and ports, users can do that from the Azure portal.
See the Resources section for more information about how to configure the load-balancing virtual server. The following links provide additional information related to HA deployment and virtual server configuration:. Set up Basic Load Balancing. Azure Availability Zones are fault-isolated locations within an Azure region, providing redundant power, cooling, and networking and increasing resiliency. Only specific Azure regions support Availability Zones.
Complete the following steps to launch the template and deploy a high availability VPX pair, by using Azure Availability Zones. Note: Ensure that an Azure region that supports Availability Zones is selected. After completion, select the Resource Group to see the configuration details, such as LB rules, back-end pools, health probes, and so on, in the Azure portal.
Also, users can see the location under the Location column. Users can use this cloud solution to manage, monitor, and troubleshoot the entire global application delivery infrastructure from a single, unified, and centralized cloud-based console. Citrix ADM Service provides all the capabilities required to quickly set up, deploy, and manage application delivery in Citrix ADC deployments and with rich analytics of application health, performance, and security.
Agile — Easy to operate, update, and consume. The frequency of updates, combined with the automated update feature, quickly enhances user Citrix ADC deployment. Faster time to value — Quicker business goals achievement. Unlike with the traditional on-premises deployment, users can use their Citrix ADM Service with a few clicks. Users not only save the installation and configuration time, but also avoid wasting time and resources on potential errors.
Users have one-stop management for Citrix ADCs deployed on-premises and in the cloud. Operational Efficiency — Optimized and automated way to achieve higher operational productivity. With the Citrix ADM Service, user operational costs are reduced by saving user time, money, and resources on maintaining and upgrading the traditional hardware deployments.
After users sign up for Citrix Cloud and start using the service, install agents in the user network environment or initiate the built-in agent in the instances. Then, add the instances users want to manage to the service. An agent enables communication between the Citrix ADM Service and the managed instances in the user data center. The agent collects data from the managed instances in the user network and sends it to the Citrix ADM Service. When users add an instance to the Citrix ADM Service, it implicitly adds itself as a trap destination and collects an inventory of the instance.
The following image illustrates the communication between the service, the agents, and the instances:. The Citrix ADM Service documentation includes information about how to get started with the service, a list of features supported on the service, and configuration specific to this service solution. This list documents the most common web application vulnerabilities and is a great starting point to evaluate web security. SQL Injection prevention feature protects against common injection attacks.
Field format protection feature allows the administrator to restrict any user parameter to a regular expression. For instance, you can enforce that a zip-code field contains integers only or even 5-digit integers. Form field consistency: Validate each submitted user form against the user session form signature to ensure the validity of all form elements. Buffer overflow checks ensure that the URL, headers, and cookies are in the right limits blocking any attempts to inject large scripts or code.
This is integrated into the Citrix ADC AppExpert policy engine to allow custom policies based on user and group information. Using SSL offloading and URL transformation capabilities, the firewall can also help sites to use secure transport layer protocols to prevent stealing of session tokens by network sniffing.
Attackers may steal or modify such poorly protected data to conduct credit card fraud, identity theft, or other crimes. Sensitive data may be compromised without extra protection, such as encryption at rest or in transit, and requires special precautions when exchanged with the browser.
External entities can be used to disclose internal files using the file URI handler, internal file shares, internal port scanning, remote code execution, and denial of service attacks. In addition to detecting and blocking common application threats that can be adapted for attacking XML-based applications that is, cross-site scripting, command injection, and so on.
These include schema validation to thoroughly verify SOAP messages and XML payloads, and a powerful XML attachment check to block attachments containing malicious executables or viruses. Automatic traffic inspection methods block XPath injection attacks on URLs and forms aimed at gaining access.
ADC Application Firewall also thwarts various DoS attacks, including external entity references, recursive expansion, excessive nesting, and malicious messages containing either long or many attributes and elements. Restrictions on what authenticated users are allowed to do are often not properly enforced. AAA feature that supports authentication, authorization, and auditing for all application traffic allows a site administrator to manage access controls with the ADC appliance.
The Authorization security feature within the AAA module of the ADC appliance enables the appliance to verify, which content on a protected server it should allow each user to access. Form field consistency: If object references are stored as hidden fields in forms, then using form field consistency you can validate that these fields are not tampered on subsequent requests.
Cookie Proxying and Cookie consistency: Object references that are stored in cookie values can be validated with these protections. URL closure builds a list of all URLs seen in valid responses during the user session and automatically allows access to them during that session.
Security misconfiguration is the most commonly seen issue. This is commonly a result of insecure default configurations, incomplete or improvised configurations, open cloud storage, misconfigured HTTP headers, and verbose error messages containing sensitive information. Not only must all operating systems, frameworks, libraries, and applications be securely configured, but they must be patched and upgraded in a timely fashion.
Even if deserialization flaws do not result in remote code execution, they can be used to perform attacks, including replay attacks, injection attacks, and privilege escalation attacks. Components, such as libraries, frameworks, and other software modules, run with the same privileges as the application. If a vulnerable component is exploited, such an attack can facilitate serious data loss or server takeover. Applications and APIs using components with known vulnerabilities may undermine application defenses and enable various attacks and impacts.
Vulnerability scan reports that are converted to ADC Signatures can be used to virtually patch these components. Insufficient logging and monitoring, coupled with missing or ineffective integration with incident response, allows attackers to further attack systems, maintain persistence, pivot to more systems, and tamper, extract, or destroy data. Most breach studies show the time to detect a breach is over days, typically detected by external parties rather than internal processes or monitoring.
When the log action is enabled for security checks or signatures, the resulting log messages provide information about the requests and responses that the application firewall has observed while protecting your websites and applications. The application firewall offers the convenience of using the built-in ADC database for identifying the locations corresponding to the IP addresses from which malicious requests are originating.
Default format PI expressions give the flexibility to customize the information included in the logs with the option to add the specific data to capture in the application firewall generated log messages. The Application Analytics and Management feature of Citrix ADM strengthens the application-centric approach to help users address various application delivery challenges.
This approach gives users visibility into the health scores of applications, helps users determine the security risks, and helps users detect anomalies in the application traffic flows and take corrective actions. For more information on StyleBooks, see: StyleBooks.
Users can use one or more analytics features simultaneously. Most important among these roles for App Security are:. Security Insight: Security Insight. Provides a single-pane solution to help users assess user application security status and take corrective actions to secure user applications. For more information on analytics, see Analytics: Analytics. Events represent occurrences of events or errors on a managed Citrix ADC instance. For example, when there is a system failure or change in configuration, an event is generated and recorded on Citrix ADM.
Following are the related features that users can configure or view by using Citrix ADM:. Creating event rules: Create Event Rules. View and export syslog messages: View and Export Syslog Messages. For more information on event management, see: Events.
For more information on instance management, see: Adding Instances. A common license pool from which a user Citrix ADC instance can check out one instance license and only as much bandwidth as it needs. When the instance no longer requires these resources, it checks them back in to the common pool, making the resources available to other instances that need them. For more information on license management, see: Pooled Capacity.
Citrix ADM allows users to create configuration jobs that help them perform configuration tasks, such as creating entities, configuring features, replication of configuration changes, system upgrades, and other maintenance activities with ease on multiple instances. Configuration jobs and templates simplify the most repetitive administrative tasks to a single task on Citrix ADM.
For more information on configuration management, see Configuration jobs: Configuration Jobs. Allows users to identify any configuration anomaly. Audit template: Create Audit Templates. Allows users to monitor the changes across a specific configuration. For more information on configuration audit, see: Configuration Audit. Signatures provide the following deployment options to help users to optimize the protection of user applications:.
Negative Security Model: With the negative security model, users employ a rich set of preconfigured signature rules to apply the power of pattern matching to detect attacks and protect against application vulnerabilities. Users can add their own signature rules, based on the specific security needs of user applications, to design their own customized security solutions. Hybrid security Model: In addition to using signatures, users can use positive security checks to create a configuration ideally suited for user applications.
To protect user applications by using signatures, users must configure one or more profiles to use their signatures object. In a hybrid security configuration, the SQL injection and cross-site scripting patterns, and the SQL transformation rules, in the user signatures object are used not only by the signature rules, but also by the positive security checks configured in the Web Application Firewall profile that is using the signatures object.
The Web Application Firewall examines the traffic to user protected websites and web services to detect traffic that matches a signature. A match is triggered only when every pattern in the rule matches the traffic. When a match occurs, the specified actions for the rule are invoked. Users can display an error page or error object when a request is blocked. Log messages can help users to identify attacks being launched against user applications. If users enable statistics, the Web Application Firewall maintains data about requests that match a Web Application Firewall signature or security check.
If the traffic matches both a signature and a positive security check, the more restrictive of the two actions are enforced. For example, if a request matches a signature rule for which the block action is disabled, but the request also matches an SQL Injection positive security check for which the action is block, the request is blocked.
Customization : If necessary, users can add their own rules to a signatures object. The option to add their own signature rules, based on the specific security needs of user applications, gives users the flexibility to design their own customized security solutions. A specific fast-match pattern in a specified location can significantly reduce processing overhead to optimize performance. Users can add, modify, or remove SQL injection and cross-site scripting patterns.
Built-in RegEx and expression editors help users configure user patterns and verify their accuracy. Compared to alternative solutions that require each service to be deployed as a separate virtual appliance, Citrix ADC on AWS combines L4 load balancing, L7 traffic management, server offload, application acceleration, application security, flexible licensing, and other essential application delivery capabilities in a single VPX instance, conveniently available via the AWS Marketplace.
Citrix Web Application Firewall WAF is an enterprise grade solution offering state of the art protections for modern applications. Using both basic and advanced WAF protections, Citrix WAF provides comprehensive protection for your applications with unparalleled ease of use.
Getting up and running is a matter of minutes. Further, using an automated learning model, called dynamic profiling, Citrix WAF saves users precious time. By automatically learning how a protected application works, Citrix WAF adapts to the application even as developers deploy and alter the applications. With our CloudFormation templates, it has never been easier to get up and running quickly. With auto scaling, users can rest assured that their applications remain protected even as their traffic scales up.
The first step to deploying the web application firewall is to evaluate which applications or specific data need maximum security protection, which ones are less vulnerable, and the ones for which security inspection can safely be bypassed. This helps users in coming up with an optimal configuration, and in designing appropriate policies and bind points to segregate the traffic.
For example, users might want to configure a policy to bypass security inspection of requests for static web content, such as images, MP3 files, and movies, and configure another policy to apply advanced security checks to requests for dynamic content. Users can use multiple policies and profiles to protect different contents of the same application.
The next step is to baseline the deployment. Start by creating a virtual server and run test traffic through it to get an idea of the rate and amount of traffic flowing through the user system. Then, deploy the Web Application Firewall. See the StyleBook section below in this guide for details. Finally, three of the Web Application Firewall protections are especially effective against common types of Web attacks, and are therefore more commonly used than any of the others.
Thus, they should be implemented in the initial deployment. They are:. Examines requests and responses for scripts that attempt to access or modify content on a different website than the one on which the script is located. When this check finds such a script, it either renders the script harmless before forwarding the request or response to its destination, or it blocks the connection.
When this check detects injected SQL code, it either blocks the request or renders the injected SQL code harmless before forwarding the request to the Web server. Note: If both of the following conditions apply to the user configuration, users should make certain that your Web Application Firewall is correctly configured:.
User protected websites accept file uploads or contain Web forms that can contain large POST body data. Most users find it the easiest method to configure the Web Application Firewall, and it is designed to prevent mistakes. Both the GUI and the command line interface are intended for experienced users, primarily to modify an existing configuration or use advanced options.
A default set of keywords and special characters provides known keywords and special characters that are commonly used to launch SQL attacks. Users can also add new patterns, and they can edit the default set to customize the SQL check inspection. There are several parameters that can be configured for SQL injection processing.
Users can check for SQL wildcard characters. Users can deploy relaxations to avoid false positives. The learning engine can provide recommendations for configuring relaxation rules. The following options are available for configuring an optimized SQL Injection protection for the user application:. Block — If users enable block, the block action is triggered only if the input matches the SQL injection type specification. Log — If users enable the log feature, the SQL Injection check generates log messages indicating the actions that it takes.
If block is disabled, a separate log message is generated for each input field in which the SQL violation was detected. However, only one message is generated when the request is blocked. Similarly, one log message per request is generated for the transform operation, even when SQL special characters are transformed in multiple fields. Users can monitor the logs to determine whether responses to legitimate requests are getting blocked.
A large increase in the number of log messages can indicate attempts to launch an attack. Stats — If enabled, the stats feature gathers statistics about violations and logs. An unexpected surge in the stats counter might indicate that the user application is under attack. If legitimate requests are getting blocked, users might have to revisit the configuration to see if they need to configure new relaxation rules or modify the existing ones.
Learn — If users are not sure which SQL relaxation rules might be ideally suited for their applications, they can use the learn feature to generate recommendations based on the learned data. The Web Application Firewall learning engine monitors the traffic and provides SQL learning recommendations based on the observed values. To get optimal benefit without compromising performance, users might want to enable the learn option for a short time to get a representative sample of the rules, and then deploy the rules and disable learning.
The modified HTML request is then sent to the server. The transform operation renders the SQL code inactive by making the following changes to the request:. These three characters special strings are necessary to issue commands to a SQL server. Therefore, the changes that the Web Application Firewall performs when transformation is enabled prevent an attacker from injecting active SQL. After these changes are made, the request can safely be forwarded to the user protected website.
When web forms on the user protected website can legitimately contain SQL special strings, but the web forms do not rely on the special strings to operate correctly, users can disable blocking and enable transformation to prevent blocking of legitimate web form data without reducing the protection that the Web Application Firewall provides to the user protected websites. Tip: Users normally enable either transformation or blocking, but not both. If the block action is enabled, it takes precedence over the transform action.
If users have blocking enabled, enabling transformation is redundant. It matches a single number or character in an expression. For example, users can use the following query to do a string search to find all customers whose names contain the D character.
The following example combines the operators to find any salary values that have 0 in the second and third place. Different DBMS vendors have extended the wildcard characters by adding extra operators. The Citrix Web Application Firewall can protect against attacks that are launched by injecting these wildcard characters.
This option must be used with caution to avoid false positives. The request is checked against the injection type specification for detecting SQL violations. The 4 SQL injection type options are:. This least restrictive setting is also the default setting. Do not select this option without due consideration. To avoid false positives, make sure that none of the keywords are expected in the inputs. SQL Special Character or Keyword—Either the key word or the special character string must be present in the input to trigger the security check violation.
Tip: If users configure the Web Application Firewall to check for inputs that contain a SQL special character, the Web Application Firewall skips web form fields that do not contain any special characters. Since most SQL servers do not process SQL commands that are not preceded by a special character, enabling this option can significantly reduce the load on the Web Application Firewall and speed up processing without placing the user protected websites at risk.
The SQL comments handling options are:. For example:. Braces can delimit single- or multiple-line comments, but comments cannot be nested. This is the default setting. Most other types of SQL server software do not recognize nested comments. If nested comments appear in a request directed to another type of SQL server, they might indicate an attempt to breach security on that server.
Note: If users enable the Check Request header flag, they might have to configure a relaxation rule for the User-Agent header. Presence of the SQL keyword like and a SQL special character semi-colon ; might trigger false positive and block requests that contain this header. Warning: If users enable both request header checking and transformation, any SQL special characters found in headers are also transformed. Enabling both Request header checking and transformation simultaneously might cause errors.
InspectQueryContentTypes — Configure this option if users want to examine the request query portion for SQL Injection attacks for the specific content-types. If it finds a cross-site script, it either modifies transforms the request to render the attack harmless, or blocks the request. It does not work for cookie. To prevent misuse of the scripts on user protected websites to breach security on user websites, the HTML Cross-Site Scripting check blocks scripts that violate the same origin rule, which states that scripts should not access or modify content on any server but the server on which they are located.
Any script that violates the same origin rule is called a cross-site script, and the practice of using scripts to access or modify content on another server is called cross-site scripting. The reason cross-site scripting is a security issue is that a web server that allows cross-site scripting can be attacked with a script that is not on that web server, but on a different web server, such as one owned and controlled by the attacker.
Users can configure Check complete URLs for the cross-site scripting parameter to specify if they want to inspect not just the query parameters but the entire URL to detect a cross-site scripting attack. Users can configure the InspectQueryContentTypes parameter to inspect the request query portion for a cross-site scripting attack for the specific content-types.
The Web Application Firewall learning engine can provide recommendations for configuring relaxation rules. Block — If users enable block, the block action is triggered if the cross-site scripting tags are detected in the request. If block is disabled, a separate log message is generated for each header or form field in which the cross-site scripting violation was detected. Similarly, one log message per request is generated for the transform operation, even when cross-site scripting tags are transformed in multiple fields.
If legitimate requests are getting blocked, users might have to revisit the configuration to see if they must configure new relaxation rules or modify the existing ones. Learn — If users are not sure which relaxation rules might be ideally suited for their application, they can use the learn feature to generate HTML Cross-Site Scripting rule recommendations based on the learned data. The Web Application Firewall learning engine monitors the traffic and provides learning recommendations based on the observed values.
If users enable both request-header checking and transformation, any special characters found in request headers are also modified as described above. If scripts on the user protected website contain cross-site scripting features, but the user website does not rely upon those scripts to operate correctly, users can safely disable blocking and enable transformation.
This configuration ensures that no legitimate web traffic is blocked, while stopping any potential cross-site scripting attacks. InspectQueryContentTypes — If Request query inspection is configured, the Application Firewall examines the query of requests for cross-site scripting attacks for the specific content-types.
Important: As part of the streaming changes, the Web Application Firewall processing of the cross-site scripting tags has changed. The behavior has changed in the builds that include support for request side streaming. The Cross-site scripting attack gets flagged. The Buffer Overflow check detects attempts to cause a buffer overflow on the web server.
If the Web Application Firewall detects that the URL, cookies, or header are longer than the configured length, it blocks the request because it can cause a buffer overflow. The Buffer Overflow check prevents attacks against insecure operating-system or web-server software that can crash or behave unpredictably when it receives a data string that is larger than it can handle.
Proper programming techniques prevent buffer overflows by checking incoming data and either rejecting or truncating overlong strings. Many programs, however, do not check all incoming data and are therefore vulnerable to buffer overflows. This issue especially affects older versions of web-server software and operating systems, many of which are still in use. In addition, users can also configure the following parameters:. Maximum URL Length. Requests with longer URLs are blocked.
Possible Values : 0— Default : Maximum Cookie Length. The maximum length the Web Application Firewall allows for all cookies in a request. Requests with longer cookies trigger the violations. Maximum Header Length. Requests with longer headers are blocked. Query string length. Maximum length allowed for a query string in an incoming request.
Requests with longer queries are blocked. Total request length. Maximum request length allowed for an incoming request. Prepare to install. Citrix Hypervisor virtualization environments. Microsoft System Center Configuration Manager environments. VMware virtualization environments. Nutanix virtualization environments. Install core components. Install VDAs. Install using the command line. Install VDAs using scripts.
Create a site. Create machine catalogs. Manage machine catalogs. Create delivery groups. Manage delivery groups. Create application groups. Manage application groups. Remote PC Access. Publish content. Server VDI. User personalization layer. Remove components. Upgrade and migrate. Upgrade a deployment. Security considerations and best practices. Delegated administration. Manage security keys. Smart cards. Smart card deployments. Pass-through authentication and single sign-on with smart cards.
FIDO2 authentication. App protection. Virtual channel security. Federated Authentication Service. Generic USB devices. Mobile and touch screen devices. Serial ports. Specialty keyboards. TWAIN devices. WIA devices. HDX 3D Pro. Text-based session watermark. Screen sharing. Audio features.
Browser content redirection. HDX video conferencing and webcam video compression. HTML5 multimedia redirection. Optimization for Microsoft Teams. Monitor, troubleshoot, and support Microsoft Teams. Windows Media redirection. General content redirection.
Client folder redirection. Host to client redirection. Bidirectional content redirection. Generic USB redirection and client drive considerations. Printing configuration example. Best practices, security considerations, and default operations.
Printing policies and preferences. Provision printers. Maintain the printing environment. Work with policies. Policy templates. Create policies. Compare, prioritize, model, and troubleshoot policies. Default policy settings. Policy settings reference. ICA policy settings. HDX features managed through the registry.
Load management policy settings. Profile management policy settings. User personalization policy settings. Virtual Delivery Agent policy settings. Virtual IP policy settings. Connector for Configuration Manager policy settings. Multi-type licensing. FAQ for licensing. Universal Windows Platform Apps. Connections and resources. Local Host Cache. Virtual IP and virtual loopback.
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