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Microsoft data loss prevention
- 1. Data Loss Prevention Exchange and Office 365 Will Martin Premier Field Engineer Microsoft
- 2. Agenda • DLP Overview • Built-In DLP Policies • Custom DLP Policies • Custom DLP Policy Templates • Additional Functionalities
- 3. DLP Overview
- 4. What is DLP? • Keep internal information internal • Corporate patents, contract information, etc • Allow only specific people to send externally • ex, personnel and SSNs, bankers and credit card or bank acct info • Warn people what they’re doing • Policy Tips
- 5. DLP – Exchange or Office 365 • On-Premises, Exchange only • Office 365, both SCC and ExO DLP • SCC includes SharePoint and OneDrive • Both use the same underlying engine (i.e., templates), but are implemented differently • SCC policies are background, and can only be edited in O365 policies • SCC policies can be used for email, SharePoint and OneDrive information • ExO policies are implemented through transport rules • ExO policies are more useful for email management Duh …
- 8. Policy using Default Templates • Built-in DLP Policy list • O365 – Select from group, then from list • Steps through configuring • Once saved, policy is deployed • Exchange – Select from full list • No configuring on creation • Once saved, rules have been created … NONE!!! but need customized!!! ,
- 9. Basic DLP Underpinnings • XML, RegEx, GUIDs <Entity id="50842eb7-edc8-4019-85dd-5a5c1f2bb085" patternsProximity="300" recommendedConfidence="85"> <Pattern confidenceLevel="85"> <IdMatch idRef="Func_credit_card" /> <Any minMatches="1"> <Match idRef="Keyword_cc_verification" /> <Match idRef="Keyword_cc_name" /> <Match idRef="Func_expiration_date" /> </Any> </Pattern> <Pattern confidenceLevel="65"> <IdMatch idRef="Func_credit_card" /> </Pattern> </Entity> and duct tape
- 12. Custom Policies • Uses solely transport rules – not available in O365 DLP • SCC has a “custom” selection, but it uses existing custom templates • Exchange allows a totally empty policy with no rules in it, or a rule based on anything, without a template • Open to any possible transport rules • Any existing rule can be added • Might be limited by features and capabilities in Office 365 tenant • not sure what is available in E5 vs E3 vs etc • Some capabilities require rights management
- 14. Custom DLP Policy Templates
- 15. Custom Templates from XML • XML tells how to handle data types • Custom templates are added to the lists of existing ones • After being added, they are handled just as the existing ones • Available in both ExO and SCC • Used to create policies from templates, just as the default ones are used <Entity id="E1CC861E-3FE9-4A58-82DF-4BD259EAB378" patternsProximity="300" recommendedConfidence="75"> <Pattern confidenceLevel="75"> <IdMatch idRef="Regex_employee_id" /> <Match idRef="Keyword_employee" /> </Pattern> </Entity>
- 16. Custom DLP Policy Templates Demonstration
- 17. Additional Notes • Custom Templates – GUI vs XML • GUI can do everything XML can, but requires multiple templates • Custom Dictionaries • Allow fast access to large lists of related information • Limit of 100,000 items • Larger counts can be handled by multiple dictionaries <Pattern confidenceLevel="60"> <IdMatch idRef="25df91ba-1250-4248-a3e1-9eac4bd9c70f" /> </Pattern> <Pattern confidenceLevel="75"> <IdMatch idRef="25df91ba-1250-4248-a3e1-9eac4bd9c70f" /> <Any minMatches="1"> <Match idRef="21b75a36-29b7-4aac-8517-39208c1b3571" minCount="1" /> </Any> </Pattern> …
- 19. Outside DLP (Office 365 only) • Azure Information Protection • Automatic Policies – E5 only • Conditional Access • Block according to location, device, operating system, security • Enforce MFA accordingly
- 21. Appendix
- 22. Appendix • Overview of data loss prevention policies • https://support.office.com/en-us/article/Overview-of-data-loss-prevention- policies-1966b2a7-d1e2-4d92-ab61-42efbb137f5e • DLP procedures • https://technet.microsoft.com/en-us/library/jj938003(v=exchg.150).aspx • Customize DLP – Built-In, Export, Import and create a new rule • https://blogs.technet.microsoft.com/tiagosouza/2016/11/23/customize-dlp- built-in-export-import-and-create-a-new-rule/ • Create a keyword dictionary • https://support.office.com/en-us/article/Create-a-keyword-dictionary- c8a95d1b-c3b6-4613-98ab-0331d1872cf3
Editor's Notes
- Add Demo after this slide Shortcoming in DLP for OneDrive - http://onelistdashboard/list?id=115822&refid=IP&v=1520869447 – this is caused by LAG and the product group has been working on fixing it since 2016
- Show differences between O365 DLP and Exchange DLP
- get-dlppolicytemplate -Identity 'U.S. Health Insurance Act (HIPAA)'
- get-dlppolicytemplate -Identity 'U.S. Health Insurance Act (HIPAA)’ Get-DlpSensitiveInformationTypeRulePackage | Select -First 1 | % { $_.ClassificationRuleCollectionXml } $DLPRulePack = Get-DlpSensitiveInformationTypeRulePackage | Select -First 1 $DLPRulePack | Fl ClassificationRuleCollectionXml | More .\Open-Office365.ps1 Get-DlpPolicyTemplate -Identity 'U.S. Health Insurance Act (HIPAA)’ | Fl Get-DlpPolicyTemplate -Identity 'U.S. Health Insurance Act (HIPAA)’ | Fl * .\Open-O365SCC.ps1 Get-DlpSensitiveInformationTypeRulePackage | Select -First 1 | % { $_.ClassificationRuleCollectionXml }
- Show creation of a DLP policy with no rules, then add rules
- 300 Unicode characters means 150 ASCII characters, or 15-25 words (6 to 8 letters)
- https://regexr.com/ (among many others)
- https://regexr.com/ (among many others)
- My Bike Shop My Bike Shop Stuff Bike Parts
- Show the dictionary and how to use it
- Show the dictionary and how to use it