ActiveDirectoryandNTKerberos-BlackHat：活动目录和NTKerberos黑色的帽子.ppt

1、Active Directory and NT Kerberos,Rooster JD Glaser,Introduction to NT Kerberos v5,What is NT Kerberos? How is it different from NTLM NT Kerberos vs MIT Kerberos Delegation and Client Authentication What does NT Kerberos look like on the wire? KTNet - A native NT Kerberos telnet server,What is NT Ker

2、beros,NTs new authentication system MIT Kerberos v5 - an Open Standard Kerberos is the default authenticator in W2K domains NTLM still used for compatibility usually the weakest version,How is it different from NTLM,Doesnt use a password hash system Requires fewer authentication calls More sophistic

3、ated - Yes More secure? - Possibly in pure mode Backwards compatibility hinders it NTLM v2 is strong in pure mode as well,NT Kerberos,Integrated with platform Locates KDC via DNS - DNS server required for install No support for DCE style cross-realm trust No “raw” krb5 API Postdated tickets (not imp

4、lemented) Uses authdata field in ticket,Windows 2000 Kerberos standards,RFC-1510 Kerberos change password protocol Kerberos set password protocolRC4-HMAC Kerberos Encryption type PKINIT,Kerberos Interoperability Scenarios,Kerberos clients in a Win2000 domain Kerberos servers in a Win2000 domain Stan

5、dalone Win2000 systems in a Kerberos realm Using a Kerberos realm as a resource domain Using a Kerberos realm as an account domain,MIT Kerberos Differences,Win2000 Clients Just logon Just logoff Domain membership Example app: everything Servers Use computer account via SCM,MIT Clients User logon wit

6、h kinit User logoff with kdestroy Configured with /etc/krb5.conf Example app: telnet Servers Do not logon use saved keys from keytab,Using Kerberos clients,Customer wants to have its non-windows Kerberos users use their Win2000 accounts,Setup the /etc/krb5.conf Users kinit with their Win2000 account

7、,Windows 2000 Server,Unix workstation,Using Kerberos servers,Customer wants to user their Kerberos enabled database server in an n-tier application front-ended by IIS,/etc/krb5.conf on database server Create service account in domain Use ktpass to export a keytab Copy keytab to database server IIS s

8、erver is trusted for delegation,Windows 2000 IIS Server,Unix Database Server,Windows 2000 Wks,Kerberos realm as an account domain,User logon with Kerberos principal User has shadow account in an account domain (for applying authz) Mapping is used at logon for domain identity,UserMIT.REALM.COM,MIT.RE

9、ALM.COM,Domain trusts realm users,comp$, (userMIT.REALM.COM),Standalone Win2000 computers,An employee has a Win2000 computer that they want to use in a Kerberos realm,Configure system as standalone (no domain) Use Ksetup to configure the realm Use Ksetup to establish the local account mapping Logon

10、to Kerberos realm,Win2000,Linux/Unix,MIT.REALM.COM,Trusting a Kerberos realm,Win2000 users accessing services in Kerberos realms Kerberos users accessing services in domains,Domain,Domain,Domain,Domain,europe. microsoft. com,fareast. microsoft. com,Windows 2000 Domain Trusts,Cross-domain Authenticat

11、ion,Windows 2000 Professional,Windows 2000 Server,KDC,KDC,Using Unix KDCs withWindows 2000 Authorization,Win2000 Professional,Windows 2000 Server,COMPANY.REALM,MITKDC,Windows 2000KDC,Name Mapping to NT account,NT Kerberos vs MIT Kerberos,NT caches the password for ticket renewal Its not certain whether NT uses ticket caching tracking stolen replay tickets,Kerberos v5 Ticket Deta