Tag Archives: security

Book Review: Citrix XenMobile Mobile Device Management by Akash Phoenix

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ActiveSync, Client Access, Netscaler, Security, Xenmobile
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I reviewed the book, Citrix XenMobile Mobile Device Management by Akash Phoenix, published by PACKT Publishing. The book is about one of the hot issues in the world of IT, BYOD and/or Mobile Device Management.  The appropriate audience for this book would be Director level’s, or Engineers who are brand new to XenMobile.  Engineers that are looking for a much deeper 300 level, technical deep dive will most likely be disappointed with the material however, as it serves as an introduction and 1,000 foot view of what Citrix XenMobile product can do. 

The book starts out with a good explanation of the different components that make of XenMobile, which frankly can be difficult to understand and grasp their function.  The book better explains in a concise, business fashion which components are required based on business needs than most of Citrix’s own materials do.

The author does a good job of explaining and walking through the basic installation, and also does a good job of explaining App Controller, which is generally a difficult topic to grasp for admins. I would have liked to see more info on the session policies for AppController with Netscaler but, the book is clearly a higher level overview versus the nitty gritty details.

Overall, Akash does a great job of explaining what XenMobile does, the components that make up the XenMobile solution, and how your individual business needs will drive your implementation design and requirements. It also does a good job of explaining the flexibility that XenMobile gives you, as well as an understanding of the overall capabilities of the system. For technical deep dives on each topic however, you may need to augment it with outside resources to get the complete picture.

 

Here is a link to the book so you can purchase it directly from Packt:

http://www.packtpub.com/citrix-xenmobile-mobile-device-management/book 

And here is a link to some of the XenMobile resources on the site:

http://port25guy.com/tag/xenmobile-2/

How to Install XenMobile 8.6 with XenMobile Netscaler Connector and XenMobile Mail Manager–Part 4

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ActiveSync, Blackberry, Client Access, Exchange 2010, Exchange 2013, Hosting, Netscaler, Security, Xenmobile
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See the previous posts in the series:

Part 1

Part 2

Part 3

 

In this post, we will configure the XenMobile Netscaler Connector and configure the Netscaler itself to query the Netscaler Connector on ActiveSync Connections. 

Lets download the Netscaler Connector from http://www.citrix.com/downloads/xenmobile/product-software/xenmobile-86-mdm-edition.html

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Copy the installer to PHDC-XENNC01.  We need to ensure that we have Net Framework 3.5 installed before we install Netscaler Connector.  But once that is done, lets begin the install.

This is a very simple, next, next finish install:

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Next, lets run the XenMobile Connector Configuration:

On the Web Service Tab, select HTTP and leave it as the default port of 9080

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Next, go to the Config Providers tab and click add.  Fill out the information for your Device Manager Server:

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Leave everything else default and click save.

Next navigate to the Path Filters tab. Select the only path there, and select edit.

Change the policy to be Static + mobile.accessabacus.com : Block Mode

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What this does is tell the system that it will check local rules on the Netscaler Connector, then the Device Manager.  If neither of those rules apply, it will deny the connection. 

After you have made your changes, start up services.msc and manually start these three services:

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Next, we configure the Netscaler to check in with the Netscaler Connector during ActiveSync connections.

Log into the Netscaler and go to Service Groups.  Select Add.  Name it NETSCALER-CONNECTOR

Add in your netscaler connector IP and set the Port to 9080, and protocol HTTP

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Next go to Virtual Servers and click add to create a new one.

Name it NETSCALER-CONNECTOR, select the protocol as HTTP.  Also uncheck “Directory Addressable” which will clear the IP address and port.  This is completely expected.

Add the service group you created to the server:

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Next go to AppExpert->HTTP Callouts->Add

Create the name as active_sync_filter.  Set the virtual server to the NETSCALER CONNECTOR server you created earlier.

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Click on Configure Request Attributes:

Method –> get

Host Expression – > “callout.asfilter.internal”

URL Stem Expression-> “/services/ActiveSync/Authorize”

 

user-> HTTP.REQ.HEADER(“authorization”).AFTER_STR(“Basic”).B64DECODE.BEFORE_STR(“:”).HTTP_URL_SAFE

agent –> HTTP.REQ.HEADER(“user-agent”).HTTP_URL_SAFE

ip –> CLIENT.IP.SRC

url –> (“https://”+HTTP.REQ.HOSTNAME+HTTP.REQ.URL).B64ENCODE

resultType->”json”

 

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Under Server Response:

Return Type –> Text

Expression to extract data from the response –>HTTP.RES.BODY(20)

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Now, create a second callout called active_sync_filter_deviceid.  Create everything identical to the callout active_sync_filter, except under Parameters, add one additional

DeviceId-> HTTP.REQ.URL.QUERY.VALUE(“DeviceID”)

Next go to Responder->Policies->Add

Create a new policy named active_sync_filter

Select Action = Drop

Expression equals below:

 

HTTP.REQ.URL.QUERY.CONTAINS("DeviceId") && HTTP.REQ.URL.STARTSWITH("/Microsoft-Server-ActiveSync") && HTTP.REQ.METHOD.EQ(POST) && HTTP.REQ.HOSTNAME.EQ("callout.asfilter.internal").NOT && SYS.HTTP_CALLOUT(active_sync_filter).SET_TEXT_MODE(IGNORECASE).CONTAINS("allow").NOT

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Create a second policy named active_sync_filter_deviceid

Again, set the Action = Drop

Expression equals below:

HTTP.REQ.URL.QUERY.CONTAINS("DeviceId") && HTTP.REQ.URL.STARTSWITH("/Microsoft-Server-ActiveSync") && HTTP.REQ.METHOD.EQ(POST) && HTTP.REQ.HOSTNAME.EQ("callout.asfilter.internal").NOT && SYS.HTTP_CALLOUT(active_sync_filter_deviceid).SET_TEXT_MODE(IGNORECASE).CONTAINS("allow").NOT

 

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Okay, hang in there, we are almost done.  Now, we need to find our Exchange Load Balancer server in the Netscaler.

Navigate to the Policy tab, select Responder.  Add the policies so that active_sync_filter_deviceid is lower number priority than active_sync_filter

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Okay, that’s enough for now.  Next time we will configure Device Manager to deny certain devices based on set criteria and test it out!

How to Install XenMobile 8.6 with XenMobile Netscaler Connector and XenMobile Mail Manager–Part 3

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ActiveSync, Client Access, Exchange 2010, Exchange 2013, Netscaler, Xenmobile
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See the previous posts in the series:

Part 1

Part 2

Part 4

In the last article, we installed Device Manager.  Now we will configure basic policies and settings.  Log into your instance by going to http://servername/zdm

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You will get treated to a “Getting Started with Device Manager” screen which will allow you build the basic policies.

Select that you are not using App Controller:

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Leave the Base Package as the name:

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Select the Passcode bubble to add to the policy, then configure the passcode you want to configure:

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Select Yes, enroll in corporate credentials:

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This will bring you to the LDAP directory screen:

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Configure your active directory connection.  Ensure to enter a user account that can read from the directory, it only needs to be a Domain User:

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Select Next, accept the defaults for the LDAP attributes import:

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At the groups to add, you need to select two groups.  One that can be admins of the XenMobile Device Manager server. And the other that can enroll their devices.  We will use Domain Admins to Administrator, and Domain Users to users:

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Select Next and then Finish.  The Test Enrollment Screen will show you how you can test from mobile devices:

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Click Next->Next-> Go to Device Manager.

Now, we need to configure the Netscaler to present the Device Manager server to the internet as mobile.accessabacus.com.

Log into your Netscaler and go to Traffic Management->Load Balancing->Service Groups

Click Add.  Give a name for the service group, for example XENMOBILE-DEVICEMANAGER-443.  Choose Protocol as SSL Bridge.  Add PHDC-XENDM01 to the members, and select Port 443

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Save the group.  Make sure to do the same thing for port 8443:

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Finally, create one for HTTP as the protocol on port 80:

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Next go to Virtual Servers and click Add:

Create a name for the virtual server, and select Protocol as SSL Bridge, and the Port as 443.  Assign it an IP address.  On the service groups tab, select the service group you created above:

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Do the same thing for port 8443:

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Finally create the virtual server for HTTP and select the HTTP protocol and service group

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Next, point your DNS to the IP address you assigned the load balancer and see if you can resolve the web page.  Remember, you need ports 80, 443 and 8443 open from the external world to the Device Manager Server.

In the next article, we will install XenMobile Netscaler Connector and attach it to the XenMobile Device Manager.

How to Lock Down Activesync Users to Specific Device in Exchange 2010 or Exchange 2007

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ActiveSync, Client Access, exchange 2007, Exchange 2010
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With the recent release of the Apple iPad, the new iPhone, not to mention the numerous Google Android phones available, there has been a dramatic increase in interest in using Exchange ActiveSync along with Exchange Server 2010 or Exchange Server 2007. 

Along with using these devices, comes certain questions regarding security.  One of those topics, covered by this post, is how to restrict end users to a specific ActiveSync device.  Some ActiveSync devices do not support certain features, that Exchange Admins may want to ensure don’t connect to their systems.

For this example, we’ll run the Get-ActiveSyncDeviceStatistics –Mailbox pponzeka command to determine the DeviceID of the users current ActiveSync device:

 

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Note the DeviceID listed, 413030303030313542354533744.  This is akin to a serial number for this particular active sync device, its unique per device.  We can lock down this use, so that he can only use THIS device to connect to his mailbox via activesync.

To do so, we simple run the command Set-CasMailbox pponzeka –ActiveSyncAllowedDeviceIDs number1,number2

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If we had multiple devices, you would just list both numbers separated by a comma.

If you ever want to remove the restriction, simply enter the null value:

Set-CasMailbox pponzeka –ActiveSyncAllowedDeviceIDs:$null

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This will set this users mailbox back to the default of allowing all activesync device’s to connect!