Deploying DNSSEC in Windows Server 2012 Rob Kuehfus Program Manager Microsoft Corporation WSV325

OverviewDeployment Operations New in DNS

DNS Spoofing Demo

OverviewDeployment OperationsNew in DNS

Beyond Virtualization Windows Server 2012 offers a dynamic, multi-tenant infrastructure that goes beyond virtualization to provide maximum flexibility for delivering and connecting to cloud services. Modern Workstyle, Enabled Windows Server 2012 empowers IT to provide users with flexible access to data and applications from virtually anywhere on any device with a rich user experience, while simplifying management and helping maintain security, control and compliance. The Power of Many Servers, the Simplicity of One Windows Server 2012 offers excellent economics by integrating a highly available and easy to manage multi-server platform with breakthrough efficiency and ubiquitous automation. Every App, Any Cloud WS2012 is a broad, scalable and elastic server platform that gives you the flexibility to build and deploy applications and websites on-premises, in the cloud and in a hybrid environment, using a consistent set of tools and frameworks.

OverviewDeployment OperationsNew in DNS

ISP root com contoso.com I don’t have that information I’ll ask root I don’t have that information ask com I don’t have that information ask contoso.com No problem its A RRSIG

ISP contoso.com A RRSIG contoso.com DNSKEY(KSK) contoso.com DNSKEY(ZSK) contoso.com DNSKEY(ZSK) RRSIG AHash Compute hash Hash RRSIG Decrypt with DNSKEY(ZSK) An RRSIG has been returned. I will validate to see if this is correct root com

ISP contoso.com But how do I know the DNSKEY is not spoofed? A RRSIG contoso.com DNSKEY(KSK) contoso.com DNSKEY(ZSK) contoso.com DNSKEY(ZSK) RRSIG contoso.com DNSKEY(ZSK)Hash Compute hash Hash contoso.com DNSKEY(ZSK) RRSIG Decrypt with DNSKEY(KSK) root com

ISP contoso.com But how I do know I have the correct KSK DNSKEY? A RRSIG contoso.com DNSKEY(KSK) contoso.com DNSKEY(ZSK) contoso.com DNSKEY(ZSK) RRSIG contoso.com DNSKEY(KSK)Hash Compute hash contoso.com DS contoso.com DS RRSIG Contoso.com DS root com

ISP contoso.com COM could be spoofed, right? Let’s check! contoso.com DS contoso.com DS RRSIG com DNSKEY(KSK) com DNSKEY(ZSK) com DNSKEY(ZSK) RRSIG contoso.com DSHash Compute hash Hash contoso.com RRSIG Decrypt with DNSKEY(ZSK) root com

ISP root com contoso.com I will validate all the way to root by building a chain up to root A RRSIG contoso.com DNSKEY(KSK) contoso.com DNSKEY(ZSK) contoso.com DNSKEY(ZSK) RRSIG.com DNSKEY(KSK).com DNSKEY(ZSK).com DNSKEY(ZSK) RRSIG contoso.com DS contoso.com DS RRSIG root DNSKEY(KSK) root DNSKEY(ZSK) root DNSKEY(ZSK) RRSIG.com DS com DS RRSIG

ISP Who do I ask to make sure root’s KSK DNSKEY is correct? contoso.com DS contoso.com DS RRSIG root DNSKEY(KSK) com DNSKEY(ZSK) com DNSKEY(ZSK) RRSIG Wait a minute… I already have the DNSKEY record in my Trust Anchor store for root. Lets use it. root DNSKEY(KSK) root com contoso.com root DNSKEY(KSK)

ISP root com contoso.com I have complete my validation and everything checks out! A RRSIG contoso.com DNSKEY(KSK) contoso.com DNSKEY(ZSK) contoso.com DNSKEY(ZSK) RRSIG.com DNSKEY(KSK).com DNSKEY(ZSK).com DNSKEY(ZSK) RRSIG contoso.com DS contoso.com DS RRSIG root DNSKEY(KSK) root DNSKEY(ZSK) root DNSKEY(ZSK) RRSIG.com DS com DS RRSIG

accounting.contoso.com A record enroll.contoso.com A record server3.contoso.com A record hr.contoso.com A record A record accounting.contoso.com A record enroll.contoso.com A record server3.contoso.com A record hr.contoso.com A record A record Next Secure enroll.contoso.com NSEC record Next Secure hr.contoso.com NSEC record Next Secure server3.contoso.com NSEC record Next Secure NSEC record Next Secure contoso.com NSEC record Next Secure accounting.contoso.com NSEC record contoso.com (unsigned) Contoso.com (signed w/ NSEC)

accounting.contoso.com A record enroll.contoso.com A record server3.contoso.com A record hr.contoso.com A record A record Next Secure enroll.contoso.com NSEC record Next Secure hr.contoso.com NSEC record Next Secure server3.contoso.com NSEC record Next Secure NSEC record Next Secure contoso.com NSEC record Next Secure accounting.contoso.com NSEC record Contoso.com (signed w/ NSEC) budget. contoso.com Hmm…..but now we have learned there are no records between budget and accounting

accounting.contoso.com A record enroll.contoso.com A record server3.contoso.com A record hr.contoso.com A record A record Next Secure 3 oejsnw854jr NSEC3 record Next Secure 3 km8301jsdyew NSEC3 record Next Secure 3 mhsq74ikjdj NSEC3 record Next Secure 3 ythe84jkf NSEC3 record Next Secure 3 kdfshjdfswe98 NSEC3 record Next Secure 3 mdjeu489wjd NSEC3 record Contoso.com (signed w/ NSEC3) budget. contoso.com Returns a hashed response to prevent dictionary attacks

Signing a zone Demo

OverviewDeployment OperationsNew in DNS

 Latest RFCs  NSEC3 Support  RSA/SHA-2 Signing  Automated Trust Anchor rollover ENABLING ENTERPRISE DNSSEC ROLLOUT OverviewDeployment OperationsNew in DNS

 Active Directory Integrated  Support for dynamic updates  Preserving the multi-master DNS model  Leverage AD for secure key distribution and Trust Anchor distribution ENABLING ENTERPRISE DNSSEC ROLLOUT OverviewDeployment OperationsNew in DNS

ENABLING ENTERPRISE DNSSEC ROLLOUT OverviewDeployment OperationsNew in DNS

 Automated re-signing on static and dynamic updates  Automated key rollovers  Automated signature refresh  Automated updating of secure delegations  Automated distribution and updating of Trust Anchors ENABLING ENTERPRISE DNSSEC ROLLOUT OverviewDeployment OperationsNew in DNS

Active Directory integrated zone Classic multi-master deployment Hosted on five DNS servers that are also domain controllers OverviewDeployment OperationsNew in DNS

OverviewDeployment OperationsNew in DNS

Single location for all key generation and management Drives automated rollover Administrator designates one server to be the key master First DNSSEC server becomes KM OverviewDeployment OperationsNew in DNS

Private zone signing keys replicate automatically to all DCs hosting the zone through AD replication Each zone owner signs its own copy of the zone when it receives the key Only Windows 8 DCs will sign their copy of the zone OverviewDeployment OperationsNew in DNS

1. Client sends dynamic update to any authoritative DNS server 2. That DNS server updates its own copy of the zone and generates signatures 3. The unsigned update is replicated to all other authoritative servers 4. Each DNS server adds the update to its copy of the zone and generates signatures OverviewDeployment OperationsNew in DNS

Deploy Trust Anchor Demo

Trust Anchor Distribution Trust Anchors replicate to all DNS servers that are DCs in the forest via AD Distribution of TAs to servers not a domain controller in the forest is manual via PowerShell or DNS Manager Trust Anchor maintenance Trust Anchor updates are automatically replicated via AD to all servers in the forest Automated Trust Anchor rollover is used to keep TAs up to date OverviewDeployment OperationsNew in DNS

USING WINDOWS SERVER 8 ON THE INTRANET Introduce Windows Server 2012 DCs Sign zone Roll out Windows Server 2012 DCs Update LDNS to Windows Server 2012 Deploy TAs on LDNS server Validation on all LDNS Servers Deploy last mile solution Automated DNSSEC rollover OverviewDeployment OperationsNew in DNS

KSK contoso.com ZSK1 OverviewDeployment OperationsNew in DNS ZSK2 Initial Insert new Key Replicate Resign w/ new Key Remove old Key

KSK OverviewDeployment OperationsNew in DNS ZSK2 contoso.com ZSK1 Initial Insert new Key Replicate Resign w/ new Key Remove old Key

Signatures stay up-to-date New records are signed automatically when zone data changes Static and dynamic updates NSEC records are kept up to date Automated key rollovers Key rollover frequency is configured per zone Key master automatically generates new keys and replicates via AD Zone owners rollover keys and re-signs the zone Secure delegations from the parent are also automatically updated (within the same forest) OverviewDeployment OperationsNew in DNS

Authoritative for the zone Non-Auth DNS resolver DNSSECIPSEC OverviewDeployment OperationsNew in DNS GPO

Last Mile Demo

OverviewDeployment OperationsNew in DNS

OverviewDeployment OperationsNew in DNS

OverviewDeployment OperationsNew in DNS

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