I haven't tested this myself but you could try the following :
If I'm not mistaken for corporate Gmail access, the usernames have the customer domain name (eg. firstname.lastname@example.org).
Personal Gmail accounts have usual usernames (eg. email@example.com)
To block personal gmail access, enable ssl-decryption. Next, create a data pattern matching "@gmail.com".
Match this Data pattern on gmail-base app in a Data filtering object.
Apply the Data Filtering object to a policy.
This way you should be able to access corporate gmail accounts and personal gmail access should be blocked.
One caveat I think exists here :
Matching for the regex "@gmail\.com" in the whole page content might also have unwanted matches such as :
-Sending an email to firstname.lastname@example.org from the corporate account
-Reading an email from email@example.com on the corporate account
I would think along those lines ... other tips are welcome ^_^
Thanks for the idea, Kiwi.
Trying to test/implement it, but I think the problem is that there is no option to add ssl or google-base as application in Data filtering profile(whys is that?). Authentication form for gmail is done through accounts.google.com and its not detected as gmail-base application. Will continue testing. If anyone else have any ideas feel free to wite them here.
Step 1 Make sure you are decrypting traffic from the inside to the outside
Step 2 Create a custom URL with *.google.com and *.gmail.com
Step 3 Create a URL FILTER
Select HTTP HEADER Insertion
Called it GMAIL-GOOGLE Type Google apps Access control
Under domain add the following *.google.com and gmail.com
Select header X-GooApps-Allowed domain
Under value add your corporate domain example.com paloaltonetworks.com etc
You can add 5 domains
STEP 4 create a policy
INSIDE-2-OUTSIDE Inside outside APPS GOOGLE-APPS service URL Category=GMAIL-COORPORATE Action= allow profile=url Filtering =GMAIL-FILTER
GOOGLE-APPS= GMAIL, Google-BASE, ssl, RTCP,rtp-base,stun,web-browsing vidyo
Group.. i would recommend that the customer look at HTTP Header Insertion n under the URL Filter Profile section
With the HTTP header insertion and modification feature, you can now manage HTTP header information to disallow SaaS consumer accounts while allowing a specific enterprise account.
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