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Understanding Group Policy

Understanding Group Policy. James Michael Stewart CISSP, TICSA, CIW SA, CCNA, MCSE NT & W2K, iNet+ michael@itinfopros.com. What is Group Policy?. A centralized collection of operational and security controls Available in Active Directory domains

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Understanding Group Policy

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  1. Understanding Group Policy James Michael Stewart CISSP, TICSA, CIW SA, CCNA, MCSE NT & W2K, iNet+ michael@itinfopros.com

  2. What is Group Policy? • A centralized collection of operational and security controls • Available in Active Directory domains • Contains items previously found in system policies and through editing the Registry (i.e. Windows NT) Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  3. Elements of Group Policy • general security controls • audit • user rights • passwords • accounts lockout • Kerberos • Public key policies • IPSec policies

  4. Divisions of Group Policy • Computer Configuration • User Configuration Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  5. Application of Group Policy • Group Policy Objects – GPOs • Can be applied to any AD container • Application order: LSDOU • Local, Site, Domain, Organizational Unit • Last GPO applied takes precedent Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  6. Group Policy Editors • MMC snap-in: Group Policy • Active Directory Domains and Trusts • Active Directory Sites and Services Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  7. GPO Application • Inheritance by default • No Override – prevents other GPOs from changing settings in this GPO • Disabled – this GPO is not applied to this container • Multiple GPOs on same container – application order • Disable Computer Configuration or User Configuration • Set Allow/Deny for Apply Group Policy to control user/group application

  8. GPO Limitations • If a single user is a member of 70 to 80 groups, the respective GPOs may not be applied • Problem caused by Kerberos token size – 70 to 80 groups fills the token and causes an error • Result is no GPOs are applied

  9. GPO Uses • Local GPO • Windows 2000, XP, .NET Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  10. Security Configuration and Analysis • MMC snap-ins: • Security Configuration and Analysis • Security Templates • Used to customize Group Policies a.k.a. security templates. • Several pre-defined security templates for client, server, and DC systems of basic, compatible, secure, and high security. • Analyze current security state

  11. GPO: Password Policy • Min & max password age (0-999) • Min password length (0-14) • History (1 - 24 entries) • Passwords must meet complexity requirements • Store passwords using reversible encryption for all users in the domain

  12. GPO: Accounts Policy • Lockout duration (0 – 99999 minutes) • Failed logon attempts • Counter reset after time limit Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  13. GPO: Audit Policy • Account logon events Account management • Directory service access • Logon events Object access • Policy change Privilege use • Process tracking System events • Object level controls accessed through Advanced Security Properties • Audit policy must be enabled in order for audited events to be recorded in the Security log

  14. GPO: User Rights • To increase security settings, make the following changes: • Log on locally: assigned only to Administrators on Servers • Shutdown the System: assigned only to Administrators, Power Users • Access computer from network: assigned to Users, revoke for Administrators and Everyone • Restore files/directories: revoke for Backup Operators • Bypass traverse checking: assigned to Authenticated Users, revoke for Everyone

  15. GPO: Security Options • Numerous security related controls • Previous found only as Registry edits Submit a question anytime by clicking on the Ask a Question link in the bottom left corner of your presentation screen.

  16. GPO: misc • Scripts • Public Key – EFS • IPSec • Software • Administrative Templates • Templates for Registry alteration

  17. Using GPOs • Group similar users • Place similar users/groups in separate containers (i.e. OUs) • Define universal GPOs at domain level • Define specific GPOs as far down the organizational tree as possible • Avoid changing default inheritance mechanism

  18. Questions? Click on the Ask a Question link in the lower left corner of your screen to ask James Michael Stewart a question.

  19. Thank you for your participation!Did you like this Webcast? Send us your feedback on this event and ideas for other event topics at editor@searchwin2000.com.

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