Features/DNSSEC

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(Large rewrite of text and instructions. Also reflected the default disabled state of DNSSEC)
(Feature Name)
 
(23 intermediate revisions by 6 users not shown)
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= Feature Name =
 
= Feature Name =
DNSSEC - Enable DNSSEC and DLV security extensions for DNS and prime validating resolvers with DNSSEC keys.
+
DNSSEC - Enable DNSSEC and DLV security extensions for DNS and prime validating resolvers with DNSSEC keys. This feature has been included in Fedora 11
 +
 
 +
This page has been obsoleted by:
 +
 
 +
 
 +
https://fedoraproject.org/wiki/Features/DNSSEC_on_workstations
 +
 
 +
 
 +
 
  
 
== Summary ==
 
== Summary ==
Line 10: Line 18:
  
 
== Current status ==
 
== Current status ==
* Targeted release: [[Releases/{{FedoraVersion||next}} | {{FedoraVersion|long|next}} ]]  
+
* Targeted release: [[Releases/{{FedoraVersion||11}} | {{FedoraVersion|long|next}} ]]  
* Last updated: 2009-03-03
+
* Last updated: 2009-04-15
* Percentage of completion: 90% (commandline tool [https://admin.fedoraproject.org/pkgdb/packages/name/dnssec-conf dnssec-conf] finished 100%, system-config-dnssec finished 70%)
+
* Percentage of completion: 100%
  
 
== Detailed Description ==
 
== Detailed Description ==
Important servers already support DNSSEC. Main problem is key distribution. A full validation path would start at the root (".") but it is not likely that the root will be signed very soon. There are two methods for working around not having a signed root:
+
Important DNS nameserver software and some TLD's already support DNSSEC. Main problem is key distribution. A full validation path would start at the root (".") but it is not likely that the root will be signed very soon. There are two methods for working around not having a signed root:
 
* Using Trust Anchor Repositories (TAR's or "batched TAR") for TLD keys  
 
* Using Trust Anchor Repositories (TAR's or "batched TAR") for TLD keys  
 
* Using DNSSEC Lookaside Verification (DLV or "live TAR") for enduser domains within an unsigned TLD.
 
* Using DNSSEC Lookaside Verification (DLV or "live TAR") for enduser domains within an unsigned TLD.
Line 21: Line 29:
 
This feature adds support for both TAR and DLV support, using the following approach:  
 
This feature adds support for both TAR and DLV support, using the following approach:  
  
* supply initial set of DNSSEC keys for TLD's (and perhaps some "very important domains")  as long as the root is not signed. This is done via [https://admin.fedoraproject.org/pkgdb/packages/name/dnssec-conf dnssec-conf])
+
* supply initial set of DNSSEC keys for TLD's (and perhaps some "very important domains")  as long as the root is not signed. This is done via [https://admin.fedoraproject.org/pkgdb/packages/name/dnssec-conf dnssec-conf]) (completed)
 
* allow easy way to enable/disable DNSSEC via commandline tool dnssec-configure from the  dnssec-conf package (completed)  
 
* allow easy way to enable/disable DNSSEC via commandline tool dnssec-configure from the  dnssec-conf package (completed)  
* allow easy way to enable/disable DNSSEC via GUI tool system-config-dnssec tool (70% completed)
 
 
* allow configuration of any DLV Registry, with the default set to [http://dlv.isc.org ISC], using the above two mentioned tools (completed)
 
* allow configuration of any DLV Registry, with the default set to [http://dlv.isc.org ISC], using the above two mentioned tools (completed)
 
* support for automated Trust Anchor Rollovers from DNS information via the [https://admin.fedoraproject.org/pkgdb/packages/nameautotrust autotrust] package using secure RFC5011 update mechanism. This is in addition to updates supplied via the dnssec-conf package. (completed)
 
* support for automated Trust Anchor Rollovers from DNS information via the [https://admin.fedoraproject.org/pkgdb/packages/nameautotrust autotrust] package using secure RFC5011 update mechanism. This is in addition to updates supplied via the dnssec-conf package. (completed)
  
 
== Benefit to Fedora ==
 
== Benefit to Fedora ==
Our servers (and clients) will be able to use DNSSEC, and be safer against cache poisoning, Kaminsky attacks, spoofing and other known DNS attacks. Fedora machines will also be able to use signed TLD's and individually signed domains in DLV without any additional administration. For example, right now that already gives you DNSSEC for the entire .gov domain, plus a handful of TLD's and a few dozen in-arpa domains including the ENUM zone.
+
Our servers (and clients) will be able to use DNSSEC, and be safer against cache poisoning, Kaminsky attacks, spoofing and other known DNS attacks. Fedora machines will also be able to use signed TLD's and individually signed domains in DLV without any additional administration. For example, right now that already includes DNSSEC for the entire .gov domain, plus a handful of TLD's and a few dozen in-arpa domains including the ENUM zone.
  
 
== Scope ==
 
== Scope ==
Line 36: Line 43:
 
* add the "autotrust" package which implements RFC 5011 - "Automated Updates of DNS Security (DNSSEC) Trust Anchors". This package includes a daily cronjob that will try to update any configured DNSSEC trust anchors from the dnssec-conf package, and any manually installed trust anchors by the administrator. (completed)
 
* add the "autotrust" package which implements RFC 5011 - "Automated Updates of DNS Security (DNSSEC) Trust Anchors". This package includes a daily cronjob that will try to update any configured DNSSEC trust anchors from the dnssec-conf package, and any manually installed trust anchors by the administrator. (completed)
 
* create system-config-dnssec GUI tool to enable / disable the most important features (70% done)
 
* create system-config-dnssec GUI tool to enable / disable the most important features (70% done)
* Change the default configurations to enable DNSSEC for Fedora-12 (todo for F-12)
+
* Update the Bind and Unbound packages so the default configurations enable DNSSEC for Fedora-11
 +
 
 
== How To Install ==
 
== How To Install ==
 
<pre>
 
<pre>
 
  yum install bind-utils
 
  yum install bind-utils
 
  yum install bind (or unbound or both)
 
  yum install bind (or unbound or both)
yum install dnssec-conf
+
  service named start (or unbound or both)
dnssec-configure --dnssec=on --dlv=on
+
</pre>
  service named start (or service unbound start)
+
  
 +
This installation should bring in dnssec-conf. Starting the daemon once will update the DNSSEC and DLV settings for the daemons. Settings can be changed in /etc/sysconfig/dnssec
 +
You can verify the installation and configuration using:
 +
 +
<pre>
 +
dnssec-configure -s
 +
</pre>
 +
 +
DNSSEC is enabled per default. DLV is also enabled per default, and uses [http://dlv.isc.org dlv.isc.org] as the DLV Registry. If you want to disable DNSSEC or DLV, edit /etc/sysconfig/dnssec. After changing this file, restart the daemon you were using:
 +
<pre>
 +
service named restart (or service unbound restart)
 +
</pre>
 +
 +
For the GUI, use
 +
 +
<pre>
 
  yum install system-config-dnssec
 
  yum install system-config-dnssec
then navigate to System->Administration->DNSSEC
 
(system-config-dnssec is not yet finished)
 
 
</pre>
 
</pre>
 +
 +
Navigate to System->Administration->DNSSEC
 +
 +
(system-config-dnssec is not yet finished)
  
 
== How to Test ==
 
== How to Test ==
Line 54: Line 78:
 
  dig +dnssec +multiline -t ns gov. @localhost
 
  dig +dnssec +multiline -t ns gov. @localhost
 
</pre>
 
</pre>
You should see the AD bit in the reply, as well as the RRSIG signature record:
+
You should see the AD ("Authenticated Data") bit in the reply, as well as the RRSIG signature record:
 
<pre>
 
<pre>
 
$ dig +dnssec +multiline -t ns gov. @127.0.0.1
 
$ dig +dnssec +multiline -t ns gov. @127.0.0.1
Line 96: Line 120:
 
<pre>
 
<pre>
 
  dig +multiline +dnssec -t any gov. @localhost
 
  dig +multiline +dnssec -t any gov. @localhost
 +
</pre>
 +
 +
To test the DLV, try to resolve a known DLV entry that does not occur in a DNSSEC signed zone (and is not loaded explicitely, such as dlv.isc.org), for example:
 +
<pre>
 +
dig +dnssec +multiline -t ns isc.org.
 
</pre>
 
</pre>
  
Line 107: Line 136:
 
</pre>
 
</pre>
 
This should produce the forged/broken answer despite its known forgery.
 
This should produce the forged/broken answer despite its known forgery.
 +
 +
To test the denial of existence, you can query a non-existing domain in a dnssec siged zone, eg:
 +
<pre>
 +
dig +dnssec +multiline -t ns thisdoesnotexist.se.
 +
</pre>
 +
This should return a the same "AD" bit, as well as an NSEC record. In this case:
 +
 +
<pre>
 +
thisdesertlife.se. 7200 IN NSEC thisell.se. NS RRSIG NSEC
 +
</pre>
 +
This is a signed response saying your domain thisdoesnotexist.se does not exist. The signed entry here starts with "thisdesertlife.se." and the next record is "thisell.se". Since "thisdoesnotexist.se" would fall in between these two, this (sgned) record would only exist if "thisdoesnotexist.se" would not exist. To avoid revealing other domain names, another more complex method, called NSEC3, can be used. This is in use wth .gov, so you will see that manually validating that answer is much harder. For details on NSEC3, see RFC-5155
  
 
== User Experience ==
 
== User Experience ==
Line 113: Line 153:
 
== Related Packages ==
 
== Related Packages ==
  
* [https://admin.fedoraproject.org/pkgdb/packages/name/ldns ldns]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/ldns ldns]
* [https://admin.fedoraproject.org/pkgdb/packages/name/unbound unbound]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/unbound unbound]
* [https://admin.fedoraproject.org/pkgdb/packages/name/bind bind]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/bind bind]
* [https://admin.fedoraproject.org/pkgdb/packages/name/nsd nsd]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/nsd nsd]
* [https://admin.fedoraproject.org/pkgdb/packages/name/autotrust autotrust]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/autotrust autotrust]
* [https://admin.fedoraproject.org/pkgdb/packages/name/dnssec-conf dnssec-conf]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/dnssec-conf dnssec-conf]
* [https://admin.fedoraproject.org/pkgdb/packages/name/sshfp sshfp]
+
* [https://admin.fedoraproject.org/pkgdb/acls/name/sshfp sshfp]
 
* system-config-dnssec (preview:  [ftp://ftp.xelerance.com/system-config-dnssec])
 
* system-config-dnssec (preview:  [ftp://ftp.xelerance.com/system-config-dnssec])
  
Line 126: Line 166:
  
 
== Contingency Plan ==
 
== Contingency Plan ==
Disable DNSSEC by default
+
Disable DNSSEC and/or DLV by default in /etc/sysconfig/dnssec and release a software update of dnssec-conf
  
 
== Documentation ==
 
== Documentation ==
Line 132: Line 172:
  
 
== Release Notes ==
 
== Release Notes ==
Bind and unbound (recursive DNS servers) do not have DNSSEC validation enabled in their default configuration, but are ready to be configured and primed for DNSSEC using the dnssec-configure command of the dnssec-conf package.
+
Bind and unbound (recursive DNS servers) now enable DNSSEC validation in their default configuration. DNSSEC Lookaside Verification (DLV) is also enabled with the [http://dlv.isc.org/ dlv.sc.org] DLV Registry.
With DNSSEC enabled, when a domain supplies DNSSEC data (such as .gov, .se, the ENUM zone and other TLD's) then that data will be cryptographically validated on the recursive server. If validation fails, due to attempts at cache poisoning (eg via a Kaminsky Attack) then the enduser will not be given this forged/spoofed data. DNSSEC deployment is gaining speed rapidly, and is a crucial part and the next logical step to make the internet more secure for end users. And now Fedora makes this extremely easy to deploy. On the next version of Fedora, DNSSEC validation will be enabled per default.
+
This behaviour can be modified in /etc/sysconfig/dnssec by changing the DNSSEC and DLV settings.
 +
 
 +
With DNSSEC enabled, when a domain supplies DNSSEC data (such as .gov, .se, the ENUM zone and other TLD's) then that data will be cryptographically validated on the recursive DNS server. If validation fails, due to attempts at cache poisoning (eg via a Kaminsky Attack) then the enduser will not be given this forged/spoofed data. DNSSEC deployment is gaining speed rapidly, and is a crucial part and the next logical step to make the internet more secure for end users. DLV is used to add DNSSEC signed domains into TLD's that themselves are not yet signed, such as .com and .org.
  
 
== Comments and Discussion ==
 
== Comments and Discussion ==
Line 140: Line 182:
  
 
[[Category:FeatureAcceptedF11]]
 
[[Category:FeatureAcceptedF11]]
[[Category:Features needing QA approval]]
+
 
 
<!-- When your feature page is completed and ready for review -->
 
<!-- When your feature page is completed and ready for review -->
 
<!-- remove Category:FeaturePageIncomplete and change it to Category:FeatureReadyForWrangler -->
 
<!-- remove Category:FeaturePageIncomplete and change it to Category:FeatureReadyForWrangler -->
 
<!-- After review, the feature wrangler will move your page to Category:FeatureReadyForFesco... if it still needs more work it will move back to Category:FeaturePageIncomplete-->
 
<!-- After review, the feature wrangler will move your page to Category:FeatureReadyForFesco... if it still needs more work it will move back to Category:FeaturePageIncomplete-->
 
<!-- A pretty picture of the page category usage is at: https://fedoraproject.org/wiki/Features/Policy/Process -->
 
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Latest revision as of 16:24, 11 March 2012

Contents

[edit] Feature Name

DNSSEC - Enable DNSSEC and DLV security extensions for DNS and prime validating resolvers with DNSSEC keys. This feature has been included in Fedora 11

This page has been obsoleted by:


https://fedoraproject.org/wiki/Features/DNSSEC_on_workstations



[edit] Summary

DNSSEC (DNS SECurity) is mechanism which provides integrity and authenticity of DNS data. It became more important after new Kaminsky DNS poisoning attacks were found in early 2008. The most widely used recursing nameservers support DNSSEC. We currently support it for bind and unbound.

[edit] Owner

[edit] Current status

  • Targeted release: Fedora 21
  • Last updated: 2009-04-15
  • Percentage of completion: 100%

[edit] Detailed Description

Important DNS nameserver software and some TLD's already support DNSSEC. Main problem is key distribution. A full validation path would start at the root (".") but it is not likely that the root will be signed very soon. There are two methods for working around not having a signed root:

  • Using Trust Anchor Repositories (TAR's or "batched TAR") for TLD keys
  • Using DNSSEC Lookaside Verification (DLV or "live TAR") for enduser domains within an unsigned TLD.

This feature adds support for both TAR and DLV support, using the following approach:

  • supply initial set of DNSSEC keys for TLD's (and perhaps some "very important domains") as long as the root is not signed. This is done via dnssec-conf) (completed)
  • allow easy way to enable/disable DNSSEC via commandline tool dnssec-configure from the dnssec-conf package (completed)
  • allow configuration of any DLV Registry, with the default set to ISC, using the above two mentioned tools (completed)
  • support for automated Trust Anchor Rollovers from DNS information via the autotrust package using secure RFC5011 update mechanism. This is in addition to updates supplied via the dnssec-conf package. (completed)

[edit] Benefit to Fedora

Our servers (and clients) will be able to use DNSSEC, and be safer against cache poisoning, Kaminsky attacks, spoofing and other known DNS attacks. Fedora machines will also be able to use signed TLD's and individually signed domains in DLV without any additional administration. For example, right now that already includes DNSSEC for the entire .gov domain, plus a handful of TLD's and a few dozen in-arpa domains including the ENUM zone.

[edit] Scope

  • create and add a package dnssec-conf which will supply initial set of DNSSEC keys to machines. (completed)
  • Do not yet enable DNSSEC in default bind and unbound configurations. But make it trivially easy to enable DNSSEC via dnssec-conf. (completed)
  • create commandline tool (dnssec-configure from the dnssec-conf package) that will easily enable/disable DNSSEC and which allows to switch between DLV Registries and supplied DNSSEC keys (completed)
  • add the "autotrust" package which implements RFC 5011 - "Automated Updates of DNS Security (DNSSEC) Trust Anchors". This package includes a daily cronjob that will try to update any configured DNSSEC trust anchors from the dnssec-conf package, and any manually installed trust anchors by the administrator. (completed)
  • create system-config-dnssec GUI tool to enable / disable the most important features (70% done)
  • Update the Bind and Unbound packages so the default configurations enable DNSSEC for Fedora-11

[edit] How To Install

 yum install bind-utils
 yum install bind (or unbound or both)
 service named start (or unbound or both)

This installation should bring in dnssec-conf. Starting the daemon once will update the DNSSEC and DLV settings for the daemons. Settings can be changed in /etc/sysconfig/dnssec You can verify the installation and configuration using:

 dnssec-configure -s

DNSSEC is enabled per default. DLV is also enabled per default, and uses dlv.isc.org as the DLV Registry. If you want to disable DNSSEC or DLV, edit /etc/sysconfig/dnssec. After changing this file, restart the daemon you were using:

 service named restart (or service unbound restart)

For the GUI, use

 yum install system-config-dnssec

Navigate to System->Administration->DNSSEC

(system-config-dnssec is not yet finished)

[edit] How to Test

 dig +dnssec +multiline -t ns gov. @localhost

You should see the AD ("Authenticated Data") bit in the reply, as well as the RRSIG signature record:

$ dig +dnssec +multiline -t ns gov. @127.0.0.1
 
; <<>> DiG 9.5.1b3-RedHat-9.5.1-0.9.b3.fc10 <<>> +dnssec +multiline -t ns gov. @localhost
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14948
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;gov.			IN NS

;; ANSWER SECTION:
gov.			259188 IN NS G.GOV.ZONEEDIT.COM.
gov.			259188 IN NS A.GOV.ZONEEDIT.COM.
gov.			259188 IN NS C.GOV.ZONEEDIT.COM.
gov.			259188 IN NS E.GOV.ZONEEDIT.COM.
gov.			259188 IN NS D.GOV.ZONEEDIT.COM.
gov.			259188 IN NS F.GOV.ZONEEDIT.COM.
gov.			259188 IN NS B.GOV.ZONEEDIT.COM.
gov.			259188 IN RRSIG	NS 7 1 259200 20090309210102 (
				20090304210102 31802 gov.
				N1azd+3+CfHD4YIMukC/cGlNBTvaG6gDOa7KmSy+MmjI
				hWiJv+1bHuj3caDrJ98vR4KuyS7xCb/q5J7ParrjtLYV
				YWxnB6dDdX8cyhB9NjAuwOmCrmXIM9/3uedKwpbuQK1z
				ktWuHp0xbQT1bkxKnqZswASqbqB96lvfryWsAH01M9b9
				AOA/FP/iefWLGD/JaDCEfy2DtD2tke7hXNIQZICegoye
				oK1VhiOgkRYv6iEdYIH/pBztsP+DfaD5+hdBjQp2/P5b
				7LflyjK2S26ZSZ3LAxDgWZGDvCFngCozSaoLq16RO4DU
				vVPg33HHycdslVP2s+mtthkW9wcAC9+IMA== )

;; Query time: 122 msec
;; SERVER: 193.110.157.136#53(193.110.157.136)
;; WHEN: Wed Mar  4 18:07:11 2009
;; MSG SIZE  rcvd: 451

If you want to see more DNSSEC related records run:

 dig +multiline +dnssec -t any gov. @localhost

To test the DLV, try to resolve a known DLV entry that does not occur in a DNSSEC signed zone (and is not loaded explicitely, such as dlv.isc.org), for example:

dig +dnssec +multiline -t ns isc.org.

To verify that forged/broken data is properly refused, you can test against some test zones:

 dig +multiline +dnssec forged.test.xelerance.com @localhost

This should produce a ServFail answer. To force getting the known bad answer, run:

 dig +multiline +dnssec +cd forged.test.xelerance.com @localhost

This should produce the forged/broken answer despite its known forgery.

To test the denial of existence, you can query a non-existing domain in a dnssec siged zone, eg:

dig +dnssec +multiline -t ns thisdoesnotexist.se.

This should return a the same "AD" bit, as well as an NSEC record. In this case:

thisdesertlife.se.	7200 IN	NSEC thisell.se. NS RRSIG NSEC

This is a signed response saying your domain thisdoesnotexist.se does not exist. The signed entry here starts with "thisdesertlife.se." and the next record is "thisell.se". Since "thisdoesnotexist.se" would fall in between these two, this (sgned) record would only exist if "thisdoesnotexist.se" would not exist. To avoid revealing other domain names, another more complex method, called NSEC3, can be used. This is in use wth .gov, so you will see that manually validating that answer is much harder. For details on NSEC3, see RFC-5155

[edit] User Experience

Easy configuration and priming of DNSSEC aware resolvers.

[edit] Related Packages

[edit] Dependencies

None

[edit] Contingency Plan

Disable DNSSEC and/or DLV by default in /etc/sysconfig/dnssec and release a software update of dnssec-conf

[edit] Documentation

http://www.dnssec.net/

[edit] Release Notes

Bind and unbound (recursive DNS servers) now enable DNSSEC validation in their default configuration. DNSSEC Lookaside Verification (DLV) is also enabled with the dlv.sc.org DLV Registry. This behaviour can be modified in /etc/sysconfig/dnssec by changing the DNSSEC and DLV settings.

With DNSSEC enabled, when a domain supplies DNSSEC data (such as .gov, .se, the ENUM zone and other TLD's) then that data will be cryptographically validated on the recursive DNS server. If validation fails, due to attempts at cache poisoning (eg via a Kaminsky Attack) then the enduser will not be given this forged/spoofed data. DNSSEC deployment is gaining speed rapidly, and is a crucial part and the next logical step to make the internet more secure for end users. DLV is used to add DNSSEC signed domains into TLD's that themselves are not yet signed, such as .com and .org.

[edit] Comments and Discussion