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Mark Andrews
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DNSEXT Working Group Brian Wellington
INTERNET-DRAFT Olafur Gudmundsson
<draft-ietf-dnsext-ad-is-secure-04.txt> February 2002
<draft-ietf-dnsext-ad-is-secure-05.txt> March 2002
Updates: RFC 2535
@@ -33,7 +37,7 @@ Status of this Memo
Comments should be sent to the authors or the DNSEXT WG mailing list
namedroppers@ops.ietf.org
This draft expires on July 10, 2002.
This draft expires on September 25, 2002.
Copyright Notice
@@ -53,9 +57,9 @@ Abstract
Expires August 2002 [Page 1]
Expires September 2002 [Page 1]
INTERNET-DRAFT AD bit set on secure answers February 2002
INTERNET-DRAFT AD bit set on secure answers March 2002
1 - Introduction
@@ -66,10 +70,9 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
As specified in RFC 2535 (section 6.1), the AD bit indicates in a
response that all data included in the answer and authority sections
of the response have been authenticated by the server according to
the policies of that server. This is not especially to the policies
of that server. This is not especially useful in practice, since a
conformant server should never reply with data that failed its
security policy.
the policies of that server. This is not especially useful in
practice, since a conformant server should never reply with data that
failed its security policy.
This draft proposes to redefine the AD bit such that it is only set
if all data in the response has been cryptographically verified or
@@ -111,9 +114,10 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
Expires August 2002 [Page 2]
INTERNET-DRAFT AD bit set on secure answers February 2002
Expires September 2002 [Page 2]
INTERNET-DRAFT AD bit set on secure answers March 2002
"The AD bit MUST NOT be set on a response unless all of the RRsets in
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only set the AD bit when it has cryptographically verified the data
in the answer.
2.2 - Setting of AD bit by authorative servers
2.2 - Setting of AD bit by authoritative servers
A primary server for a secure zone the data MAY have a policy of
Primary server for a secure zone the data, MAY have the policy of
treating authoritative secure zones as Authenticated. Secondary
servers MAY have the same policy, but SHOULD NOT consider zone data
Authenticated unless the zone was transfered securely and/or the data
@@ -142,11 +146,11 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
The setting of the AD bit by authoritative servers affects only a
small set of resolvers that are configured to directly query and
trust authoritative servers. This only affects servers that function
as both recursive and authorative. All recursive resolvers SHOULD
as both recursive and authoritative. All recursive resolvers SHOULD
ignore the AD bit.
The cost of verifying all signatures on load by an authoritative
server can be high and increases the delay before it can answer begin
server can be high and increases the delay before it can begin
answering queries. Verifying signatures at query time is also
expensive and could lead to resolvers timing out on many queries
after the server reloads zones.
@@ -169,9 +173,9 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
Expires August 2002 [Page 3]
Expires September 2002 [Page 3]
INTERNET-DRAFT AD bit set on secure answers February 2002
INTERNET-DRAFT AD bit set on secure answers March 2002
configured to trust the server.
@@ -190,11 +194,11 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
servers that act both as authoritative servers and recursive
resolver.
Authorative servers that set the AD bit on answers without doing
Authoritative servers that set the AD bit on answers without doing
cryptographic checks must only do so on explicit zone by zone
enablement. This only affects resolvers that trust the server and
this functionality should only be used on servers that act both as
authorative servers and recursive resolver.
authoritative servers and recursive resolver.
Resolvers (full or stub) that blindly trust the AD bit without
knowing the security policy of the server generating the answer can
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5 - IANA Considerations:
None
None.
6 - Internationalization Considerations:
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Expires August 2002 [Page 4]
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INTERNET-DRAFT AD bit set on secure answers February 2002
INTERNET-DRAFT AD bit set on secure answers March 2002
2845, May 2000.
@@ -254,7 +258,7 @@ Authors Addresses
Full Copyright Statement
Copyright (C) The Internet Society (2001). All Rights Reserved.
Copyright (C) The Internet Society (2002>. All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
@@ -285,5 +289,5 @@ Full Copyright Statement
Expires August 2002 [Page 5]
Expires September 2002 [Page 5]