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DNSEXT Working Group Brian Wellington
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DNSEXT Working Group Brian Wellington
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INTERNET-DRAFT Olafur Gudmundsson
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INTERNET-DRAFT Olafur Gudmundsson
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<draft-ietf-dnsext-ad-is-secure-04.txt> February 2002
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<draft-ietf-dnsext-ad-is-secure-05.txt> March 2002
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Updates: RFC 2535
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Updates: RFC 2535
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@@ -33,7 +37,7 @@ Status of this Memo
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Comments should be sent to the authors or the DNSEXT WG mailing list
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Comments should be sent to the authors or the DNSEXT WG mailing list
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namedroppers@ops.ietf.org
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namedroppers@ops.ietf.org
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This draft expires on July 10, 2002.
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This draft expires on September 25, 2002.
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Copyright Notice
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Copyright Notice
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@@ -53,9 +57,9 @@ Abstract
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Expires August 2002 [Page 1]
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Expires September 2002 [Page 1]
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INTERNET-DRAFT AD bit set on secure answers February 2002
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INTERNET-DRAFT AD bit set on secure answers March 2002
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1 - Introduction
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1 - Introduction
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As specified in RFC 2535 (section 6.1), the AD bit indicates in a
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As specified in RFC 2535 (section 6.1), the AD bit indicates in a
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response that all data included in the answer and authority sections
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response that all data included in the answer and authority sections
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of the response have been authenticated by the server according to
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of the response have been authenticated by the server according to
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the policies of that server. This is not especially to the policies
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the policies of that server. This is not especially useful in
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of that server. This is not especially useful in practice, since a
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practice, since a conformant server should never reply with data that
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conformant server should never reply with data that failed its
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failed its security policy.
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security policy.
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This draft proposes to redefine the AD bit such that it is only set
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This draft proposes to redefine the AD bit such that it is only set
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if all data in the response has been cryptographically verified or
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if all data in the response has been cryptographically verified or
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@@ -111,9 +114,10 @@ INTERNET-DRAFT AD bit set on secure answers February 2002
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Expires August 2002 [Page 2]
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INTERNET-DRAFT AD bit set on secure answers February 2002
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Expires September 2002 [Page 2]
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INTERNET-DRAFT AD bit set on secure answers March 2002
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"The AD bit MUST NOT be set on a response unless all of the RRsets in
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"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
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only set the AD bit when it has cryptographically verified the data
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in the answer.
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in the answer.
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2.2 - Setting of AD bit by authorative servers
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2.2 - Setting of AD bit by authoritative servers
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A primary server for a secure zone the data MAY have a policy of
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Primary server for a secure zone the data, MAY have the policy of
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treating authoritative secure zones as Authenticated. Secondary
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treating authoritative secure zones as Authenticated. Secondary
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servers MAY have the same policy, but SHOULD NOT consider zone data
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servers MAY have the same policy, but SHOULD NOT consider zone data
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Authenticated unless the zone was transfered securely and/or the data
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Authenticated unless the zone was transfered securely and/or the data
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The setting of the AD bit by authoritative servers affects only a
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The setting of the AD bit by authoritative servers affects only a
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small set of resolvers that are configured to directly query and
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small set of resolvers that are configured to directly query and
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trust authoritative servers. This only affects servers that function
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trust authoritative servers. This only affects servers that function
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as both recursive and authorative. All recursive resolvers SHOULD
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as both recursive and authoritative. All recursive resolvers SHOULD
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ignore the AD bit.
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ignore the AD bit.
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The cost of verifying all signatures on load by an authoritative
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The cost of verifying all signatures on load by an authoritative
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server can be high and increases the delay before it can answer begin
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server can be high and increases the delay before it can begin
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answering queries. Verifying signatures at query time is also
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answering queries. Verifying signatures at query time is also
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expensive and could lead to resolvers timing out on many queries
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expensive and could lead to resolvers timing out on many queries
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after the server reloads zones.
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after the server reloads zones.
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Expires August 2002 [Page 3]
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Expires September 2002 [Page 3]
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INTERNET-DRAFT AD bit set on secure answers February 2002
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INTERNET-DRAFT AD bit set on secure answers March 2002
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configured to trust the server.
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configured to trust the server.
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servers that act both as authoritative servers and recursive
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servers that act both as authoritative servers and recursive
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resolver.
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resolver.
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Authorative servers that set the AD bit on answers without doing
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Authoritative servers that set the AD bit on answers without doing
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cryptographic checks must only do so on explicit zone by zone
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cryptographic checks must only do so on explicit zone by zone
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enablement. This only affects resolvers that trust the server and
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enablement. This only affects resolvers that trust the server and
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this functionality should only be used on servers that act both as
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this functionality should only be used on servers that act both as
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authorative servers and recursive resolver.
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authoritative servers and recursive resolver.
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Resolvers (full or stub) that blindly trust the AD bit without
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Resolvers (full or stub) that blindly trust the AD bit without
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knowing the security policy of the server generating the answer can
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knowing the security policy of the server generating the answer can
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5 - IANA Considerations:
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5 - IANA Considerations:
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None
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None.
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6 - Internationalization Considerations:
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6 - Internationalization Considerations:
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@@ -227,9 +231,9 @@ References:
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Expires August 2002 [Page 4]
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Expires September 2002 [Page 4]
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INTERNET-DRAFT AD bit set on secure answers February 2002
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INTERNET-DRAFT AD bit set on secure answers March 2002
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2845, May 2000.
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2845, May 2000.
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@@ -254,7 +258,7 @@ Authors Addresses
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Full Copyright Statement
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Full Copyright Statement
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Copyright (C) The Internet Society (2001). All Rights Reserved.
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Copyright (C) The Internet Society (2002>. All Rights Reserved.
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This document and translations of it may be copied and furnished to
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This document and translations of it may be copied and furnished to
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others, and derivative works that comment on or otherwise explain it
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others, and derivative works that comment on or otherwise explain it
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@@ -285,5 +289,5 @@ Full Copyright Statement
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Expires August 2002 [Page 5]
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Expires September 2002 [Page 5]
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