draft-ietf-ipsecme-split-dns-06.txt		draft-ietf-ipsecme-split-dns-07.txt
	Network T. Pauly		Network T. Pauly
	Internet-Draft Apple Inc.		Internet-Draft Apple Inc.
	Intended status: Standards Track P. Wouters		Intended status: Standards Track P. Wouters
	Expires: August 13, 2018 Red Hat		Expires: August 31, 2018 Red Hat
	February 9, 2018		February 27, 2018
	Split DNS Configuration for IKEv2		Split DNS Configuration for IKEv2
	draft-ietf-ipsecme-split-dns-06		draft-ietf-ipsecme-split-dns-07
	Abstract		Abstract
	This document defines two Configuration Payload Attribute Types for		This document defines two Configuration Payload Attribute Types for
	the IKEv2 protocol that add support for private DNS domains. These		the IKEv2 protocol that add support for private DNS domains. These
	domains should be resolved using DNS servers reachable through an		domains are intended to be resolved using DNS servers reachable
	IPsec connection, while leaving all other DNS resolution unchanged.		through an IPsec connection, while leaving all other DNS resolution
	This approach of resolving a subset of domains using non-public DNS		unchanged. This approach of resolving a subset of domains using non-
	servers is referred to as "Split DNS".		public DNS servers is referred to as "Split DNS".
	Status of This Memo		Status of This Memo
	This Internet-Draft is submitted in full conformance with the		This Internet-Draft is submitted in full conformance with the
	provisions of BCP 78 and BCP 79.		provisions of BCP 78 and BCP 79.
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at http://datatracker.ietf.org/drafts/current/.		Drafts is at https://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on August 13, 2018.		This Internet-Draft will expire on August 31, 2018.
	Copyright Notice		Copyright Notice
	Copyright (c) 2018 IETF Trust and the persons identified as the		Copyright (c) 2018 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(https://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
	skipping to change at page 2, line 21 ¶		skipping to change at page 2, line 21 ¶
	2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 3		2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 3
	3. Protocol Exchange . . . . . . . . . . . . . . . . . . . . . . 3		3. Protocol Exchange . . . . . . . . . . . . . . . . . . . . . . 3
	3.1. Configuration Request . . . . . . . . . . . . . . . . . . 4		3.1. Configuration Request . . . . . . . . . . . . . . . . . . 4
	3.2. Configuration Reply . . . . . . . . . . . . . . . . . . . 4		3.2. Configuration Reply . . . . . . . . . . . . . . . . . . . 4
	3.3. Mapping DNS Servers to Domains . . . . . . . . . . . . . 5		3.3. Mapping DNS Servers to Domains . . . . . . . . . . . . . 5
	3.4. Example Exchanges . . . . . . . . . . . . . . . . . . . . 5		3.4. Example Exchanges . . . . . . . . . . . . . . . . . . . . 5
	3.4.1. Simple Case . . . . . . . . . . . . . . . . . . . . . 5		3.4.1. Simple Case . . . . . . . . . . . . . . . . . . . . . 5
	3.4.2. Requesting Domains and DNSSEC trust anchors . . . . . 6		3.4.2. Requesting Domains and DNSSEC trust anchors . . . . . 6
	4. Payload Formats . . . . . . . . . . . . . . . . . . . . . . . 6		4. Payload Formats . . . . . . . . . . . . . . . . . . . . . . . 6
	4.1. INTERNAL_DNS_DOMAIN Configuration Attribute Type Request		4.1. INTERNAL_DNS_DOMAIN Configuration Attribute Type Request
	and Reply . . . . . . . . . . . . . . . . . . . . . . . . 6		and Reply . . . . . . . . . . . . . . . . . . . . . . . . 7
	4.2. INTERNAL_DNSSEC_TA Configuration Attribute . . . . . . . 7		4.2. INTERNAL_DNSSEC_TA Configuration Attribute . . . . . . . 7
	5. Split DNS Usage Guidelines . . . . . . . . . . . . . . . . . 8		5. Split DNS Usage Guidelines . . . . . . . . . . . . . . . . . 8
	6. Security Considerations . . . . . . . . . . . . . . . . . . . 9		6. Security Considerations . . . . . . . . . . . . . . . . . . . 10
	7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10		7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
	8. References . . . . . . . . . . . . . . . . . . . . . . . . . 10		8. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
	8.1. Normative References . . . . . . . . . . . . . . . . . . 10		8.1. Normative References . . . . . . . . . . . . . . . . . . 11
	8.2. Informative References . . . . . . . . . . . . . . . . . 11		8.2. Informative References . . . . . . . . . . . . . . . . . 11
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
	1. Introduction		1. Introduction
	Split DNS is a common configuration for secure tunnels, such as		Split DNS is a common configuration for secure tunnels, such as
	Virtual Private Networks in which host machines private to an		Virtual Private Networks in which host machines private to an
	organization can only be resolved using internal DNS resolvers		organization can only be resolved using internal DNS resolvers
	[RFC2775]. In such configurations, it is often desirable to only		[RFC2775]. In such configurations, it is often desirable to only
	resolve hosts within a set of private domains using the tunnel, while		resolve hosts within a set of private domains using the tunnel, while
	letting resolutions for public hosts be handled by a device's default		letting resolutions for public hosts be handled by a device's default
	DNS configuration.		DNS configuration.
	The Internet Key Exchange protocol version 2 [RFC7296] negotiates		The Internet Key Exchange protocol version 2 [RFC7296] negotiates
	configuration parameters using Configuration Payload Attribute Types.		configuration parameters using Configuration Payload Attribute Types.
	This document defines two Configuration Payload Attribute Types that		This document defines two Configuration Payload Attribute Types that
	add support for trusted Split DNS domains.		add support for trusted Split DNS domains.
	The INTERNAL_DNS_DOMAIN attribute type is used to convey one or more		The INTERNAL_DNS_DOMAIN attribute type is used to convey one or more
	DNS domains that should be resolved only using the provided DNS		DNS domains that SHOULD be resolved only using the provided DNS
	nameserver IP addresses, causing these requests to use the IPsec		nameserver IP addresses, causing these requests to use the IPsec
	connection.		connection.
	The INTERNAL_DNSSEC_TA attribute type is used to convey DNSSEC trust		The INTERNAL_DNSSEC_TA attribute type is used to convey DNSSEC trust
	anchors for those domains.		anchors for those domains.
	When only a subset of traffic is routed into a private network using		When only a subset of traffic is routed into a private network using
	an IPsec SA, these Configuration Payload options can be used to		an IPsec SA, these Configuration Payload options can be used to
	define which private domains should be resolved through the IPsec		define which private domains are intended to be resolved through the
	connection without affecting the client's global DNS resolution.		IPsec connection without affecting the client's global DNS
			resolution.
	For the purposes of this document, DNS resolution servers accessible		For the purposes of this document, DNS resolution servers accessible
	through an IPsec connection will be referred to as "internal DNS		through an IPsec connection will be referred to as "internal DNS
	servers", and other DNS servers will be referred to as "external DNS		servers", and other DNS servers will be referred to as "external DNS
	servers".		servers".
	A client using these configuration payloads will be able to request		A client using these configuration payloads will be able to request
	and receive Split DNS configurations using the INTERNAL_DNS_DOMAIN		and receive Split DNS configurations using the INTERNAL_DNS_DOMAIN
	and INTERNAL_DNSSEC_TA configuration attributes. The client device		and INTERNAL_DNSSEC_TA configuration attributes. The client device
	can use the internal DNS server(s) for any DNS queries within the		can use the internal DNS server(s) for any DNS queries within the
	assigned domains. DNS queries for other domains should be send to		assigned domains. DNS queries for other domains SHOULD be sent to
	regular external DNS server.		the regular external DNS server.
	1.1. Requirements Language		1.1. Requirements Language
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
	document are to be interpreted as described in RFC 2119 [RFC2119].		"OPTIONAL" in this document are to be interpreted as described in BCP
			14 [RFC2119] [RFC8174] when, and only when, they appear in all
			captials, as shown here.
	2. Background		2. Background
	Split DNS is a common configuration for enterprise VPN deployments,		Split DNS is a common configuration for enterprise VPN deployments,
	in which only one or a few private DNS domains are accessible and		in which only one or a few private DNS domains are accessible and
	resolvable via an IPsec based VPN connection.		resolvable via an IPsec based VPN connection.
	Other tunnel-establishment protocols already support the assignment		Other tunnel-establishment protocols already support the assignment
	of Split DNS domains. For example, there are proprietary extensions		of Split DNS domains. For example, there are proprietary extensions
	to IKEv1 that allow a server to assign Split DNS domains to a client.		to IKEv1 that allow a server to assign Split DNS domains to a client.
	skipping to change at page 4, line 22 ¶		skipping to change at page 4, line 25 ¶
	The INTERNAL_DNS_DOMAIN attribute sent by the initiator is usually		The INTERNAL_DNS_DOMAIN attribute sent by the initiator is usually
	empty but MAY contain a suggested domain name.		empty but MAY contain a suggested domain name.
	The absence of INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST		The absence of INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST
	payload indicates that the initiator does not support or is unwilling		payload indicates that the initiator does not support or is unwilling
	to accept Split DNS configuration.		to accept Split DNS configuration.
	To indicate support for DNSSEC, an initiator includes one or more		To indicate support for DNSSEC, an initiator includes one or more
	INTERNAL_DNSSEC_TA attributes as defined in Section 4 as part of the		INTERNAL_DNSSEC_TA attributes as defined in Section 4 as part of the
	CFG_REQUEST payload. If an INTERNAL_DNSSEC_TA attriute is included		CFG_REQUEST payload. If an INTERNAL_DNSSEC_TA attribute is included
	in the CFG_REQUEST, the initiator SHOULD also include one or more		in the CFG_REQUEST, the initiator SHOULD also include one or more
	INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST.		INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST. If the initiator
			includes an INTERNAL_DNSSEC_TA attribute, but does not inclue an
			INTERNAL_DNS_DOMAIN attribute, the responder MAY still respond with
			both INTERNAL_DNSSEC_TA and INTERNAL_DNS_DOMAIN attributes.
	An initiator MAY convey its current DNSSEC trust anchors for the		An initiator MAY convey its current DNSSEC trust anchors for the
	domain specified in the INTERNAL_DNS_DOMAIN attribute. If it does		domain specified in the INTERNAL_DNS_DOMAIN attribute. If it does
	not wish to convey this information, it MUST use a length of 0.		not wish to convey this information, it MUST use a length of 0.
	The absence of INTERNAL_DNSSEC_TA attributes in the CFG_REQUEST		The absence of INTERNAL_DNSSEC_TA attributes in the CFG_REQUEST
	payload indicates that the initiator does not support or is unwilling		payload indicates that the initiator does not support or is unwilling
	to accept DNSSEC trust anchor configuration.		to accept DNSSEC trust anchor configuration.
	3.2. Configuration Reply		3.2. Configuration Reply
	Responders MAY send one or more INTERNAL_DNS_DOMAIN attributes in		Responders MAY send one or more INTERNAL_DNS_DOMAIN attributes in
	their CFG_REPLY payload. If an INTERNAL_DNS_DOMAIN attribute is		their CFG_REPLY payload. If an INTERNAL_DNS_DOMAIN attribute is
	included in the CFG_REPLY, the responder MUST also include one or		included in the CFG_REPLY, the responder MUST also include one or
	both of the INTERNAL_IP4_DNS and INTERNAL_IP6_DNS attributes in the		both of the INTERNAL_IP4_DNS and INTERNAL_IP6_DNS attributes in the
	CFG_REPLY. These DNS server configurations are necessary to define		CFG_REPLY. These DNS server configurations are necessary to define
	which servers should receive queries for hostnames in internal		which servers can receive queries for hostnames in internal domains.
	domains. If the CFG_REQUEST included an INTERNAL_DNS_DOMAIN		If the CFG_REQUEST included an INTERNAL_DNS_DOMAIN attribute, but the
	attribute, but the CFG_REPLY does not include an INTERNAL_DNS_DOMAIN		CFG_REPLY does not include an INTERNAL_DNS_DOMAIN attribute, the
	attribute, the initiator should behave as if Split DNS configurations		initiator SHOULD behave as if Split DNS configurations are not
	are not supported by the server.		supported by the server.
	Each INTERNAL_DNS_DOMAIN represents a domain that the DNS servers		Each INTERNAL_DNS_DOMAIN represents a domain that the DNS servers
	address listed in INTERNAL_IP4_DNS and INTERNAL_IP6_DNS can resolve.		address listed in INTERNAL_IP4_DNS and INTERNAL_IP6_DNS can resolve.
	If the CFG_REQUEST included INTERNAL_DNS_DOMAIN attributes with non-		If the CFG_REQUEST included INTERNAL_DNS_DOMAIN attributes with non-
	zero lengths, the content MAY be ignored or be interpreted as a		zero lengths, the content MAY be ignored or be interpreted as a
	suggestion by the responder.		suggestion by the responder.
	For each DNS domain specified in an INTERNAL_DNS_DOMAIN attribute,		For each DNS domain specified in an INTERNAL_DNS_DOMAIN attribute,
	one or more INTERNAL_DNSSEC_TA attributes MAY be included by the		one or more INTERNAL_DNSSEC_TA attributes MAY be included by the
	skipping to change at page 5, line 28 ¶		skipping to change at page 5, line 35 ¶
	single list of Split DNS domains that applies to the entire list of		single list of Split DNS domains that applies to the entire list of
	INTERNAL_IP4_DNS and INTERNAL_IP6_DNS attributes.		INTERNAL_IP4_DNS and INTERNAL_IP6_DNS attributes.
	3.4. Example Exchanges		3.4. Example Exchanges
	3.4.1. Simple Case		3.4.1. Simple Case
	In this example exchange, the initiator requests INTERNAL_IP4_DNS and		In this example exchange, the initiator requests INTERNAL_IP4_DNS and
	INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST, but does not		INTERNAL_DNS_DOMAIN attributes in the CFG_REQUEST, but does not
	specify any value for either. This indicates that it supports Split		specify any value for either. This indicates that it supports Split
	DNS, but has no preference for which DNS requests should be routed		DNS, but has no preference for which DNS requests will be routed
	through the tunnel.		through the tunnel.
	The responder replies with two DNS server addresses, and two internal		The responder replies with two DNS server addresses, and two internal
	domains, "example.com" and "city.other.com".		domains, "example.com" and "city.other.com".
	Any subsequent DNS queries from the initiator for domains such as		Any subsequent DNS queries from the initiator for domains such as
	"www.example.com" should use 198.51.100.2 or 198.51.100.4 to resolve.		"www.example.com" SHOULD use 198.51.100.2 or 198.51.100.4 to resolve.
	CP(CFG_REQUEST) =		CP(CFG_REQUEST) =
	INTERNAL_IP4_ADDRESS()		INTERNAL_IP4_ADDRESS()
	INTERNAL_IP4_DNS()		INTERNAL_IP4_DNS()
	INTERNAL_DNS_DOMAIN()		INTERNAL_DNS_DOMAIN()
	CP(CFG_REPLY) =		CP(CFG_REPLY) =
	INTERNAL_IP4_ADDRESS(198.51.100.234)		INTERNAL_IP4_ADDRESS(198.51.100.234)
	INTERNAL_IP4_DNS(198.51.100.2)		INTERNAL_IP4_DNS(198.51.100.2)
	INTERNAL_IP4_DNS(198.51.100.4)		INTERNAL_IP4_DNS(198.51.100.4)
	INTERNAL_DNS_DOMAIN(example.com)		INTERNAL_DNS_DOMAIN(example.com)
	INTERNAL_DNS_DOMAIN(city.other.com)		INTERNAL_DNS_DOMAIN(city.other.com)
	3.4.2. Requesting Domains and DNSSEC trust anchors		3.4.2. Requesting Domains and DNSSEC trust anchors
	In this example exchange, the initiator requests INTERNAL_IP4_DNS,		In this example exchange, the initiator requests INTERNAL_IP4_DNS,
	INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA attributess in the		INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA attributes in the
	CFG_REQUEST		CFG_REQUEST.
	Any subsequent DNS queries from the initiator for domains such as		Any subsequent DNS queries from the initiator for domains such as
	"www.example.com" or "city.other.com" would be DNSSEC validated using		"www.example.com" or "city.other.com" would be DNSSEC validated using
	the DNSSEC trust anchor received in the CFG_REPLY		the DNSSEC trust anchor received in the CFG_REPLY.
	In this example, the initiator has no existing DNSSEC trust anchors		In this example, the initiator has no existing DNSSEC trust anchors
	would the requested domain. the "example.com" dommain has DNSSEC		would the requested domain. the "example.com" dommain has DNSSEC
	trust anchors that are returned, while the "other.com" domain has no		trust anchors that are returned, while the "other.com" domain has no
	DNSSEC trust anchors		DNSSEC trust anchors.
	CP(CFG_REQUEST) =		CP(CFG_REQUEST) =
	INTERNAL_IP4_ADDRESS()		INTERNAL_IP4_ADDRESS()
	INTERNAL_IP4_DNS()		INTERNAL_IP4_DNS()
	INTERNAL_DNS_DOMAIN()		INTERNAL_DNS_DOMAIN()
	INTERNAL_DNSSEC_TA()		INTERNAL_DNSSEC_TA()
	CP(CFG_REPLY) =		CP(CFG_REPLY) =
	INTERNAL_IP4_ADDRESS(198.51.100.234)		INTERNAL_IP4_ADDRESS(198.51.100.234)
	INTERNAL_IP4_DNS(198.51.100.2)		INTERNAL_IP4_DNS(198.51.100.2)
	INTERNAL_IP4_DNS(198.51.100.4)		INTERNAL_IP4_DNS(198.51.100.4)
	INTERNAL_DNS_DOMAIN(example.com)		INTERNAL_DNS_DOMAIN(example.com)
	INTERNAL_DNSSEC_TA(43547,8,1,B6225AB2CC613E0DCA7962BDC2342EA4F1B56083)		INTERNAL_DNSSEC_TA(43547,8,1,B6225AB2CC613E0DCA7962BDC2342EA4...)
	INTERNAL_DNSSEC_TA(31406,8,2,F78CF3344F72137235098ECBBD08947C2C90....)		INTERNAL_DNSSEC_TA(31406,8,2,F78CF3344F72137235098ECBBD08947C...)
	INTERNAL_DNS_DOMAIN(city.other.com)		INTERNAL_DNS_DOMAIN(city.other.com)
	4. Payload Formats		4. Payload Formats
	All multi-octet fields representing integers are laid out in big		All multi-octet fields representing integers are laid out in big
	endian order (also known as "most significant byte first", or		endian order (also known as "most significant byte first", or
	"network byte order").		"network byte order").
	4.1. INTERNAL_DNS_DOMAIN Configuration Attribute Type Request and Reply		4.1. INTERNAL_DNS_DOMAIN Configuration Attribute Type Request and Reply
	1 2 3		1 2 3
	skipping to change at page 7, line 50 ¶		skipping to change at page 8, line 32 ¶
	| |		| |
	~ Digest Data ~		~ Digest Data ~
	| |		| |
	+---------------------------------------------------------------+		+---------------------------------------------------------------+
	o Reserved (1 bit) - Defined in IKEv2 RFC [RFC7296].		o Reserved (1 bit) - Defined in IKEv2 RFC [RFC7296].
	o Attribute Type (15 bits) set to value 26 for INTERNAL_DNSSEC_TA.		o Attribute Type (15 bits) set to value 26 for INTERNAL_DNSSEC_TA.
	o Length (0 or 2 octets) - Length of DNSSEC Trust Anchor data (4		o Length (0 or 2 octets) - Length of DNSSEC Trust Anchor data (4
	octets plus the length of the Digest Data)		octets plus the length of the Digest Data).
	o DNSKEY Key Tag value (0 or 2 octets) - Delegation Signer (DS) Key		o DNSKEY Key Tag value (0 or 2 octets) - Delegation Signer (DS) Key
	Tag as specified in [RFC4034] Section 5.1		Tag as specified in [RFC4034] Section 5.1.
	o DNSKEY Algorithm (0 or 1 octet) - DNSKEY algorithm value from the		o DNSKEY Algorithm (0 or 1 octet) - DNSKEY algorithm value from the
	IANA DNS Security Algorithm Numbers Registry		IANA DNS Security Algorithm Numbers Registry.
	o Digest Type (0 or 1 octet) - DS algorithm value from the IANA		o Digest Type (0 or 1 octet) - DS algorithm value from the IANA
	Delegation Signer (DS) Resource Record (RR) Type Digest Algorithms		Delegation Signer (DS) Resource Record (RR) Type Digest Algorithms
	Registry		Registry.
	o Digest Data (0 or more octets) - The DNSKEY digest as specified in		o Digest Data (0 or more octets) - The DNSKEY digest as specified in
	[RFC4034] Section 5.1 in presentation format.		[RFC4034] Section 5.1 in presentation format.
	5. Split DNS Usage Guidelines		5. Split DNS Usage Guidelines
	If a CFG_REPLY payload contains no INTERNAL_DNS_DOMAIN attributes,		If a CFG_REPLY payload contains no INTERNAL_DNS_DOMAIN attributes,
	the client MAY use the provided INTERNAL_IP4_DNS or INTERNAL_IP6_DNS		the client MAY use the provided INTERNAL_IP4_DNS or INTERNAL_IP6_DNS
	servers as the default DNS server(s) for all queries.		servers as the default DNS server(s) for all queries.
	skipping to change at page 9, line 7 ¶		skipping to change at page 9, line 37 ¶
	using some other external DNS resolver(s), configured independently		using some other external DNS resolver(s), configured independently
	from IKE. Queries for these other domains MAY be sent to the		from IKE. Queries for these other domains MAY be sent to the
	internal DNS resolver(s) listed in that CFG_REPLY message, but have		internal DNS resolver(s) listed in that CFG_REPLY message, but have
	no guarantee of being answered. For example, if the		no guarantee of being answered. For example, if the
	INTERNAL_DNS_DOMAIN attribute specifies "example.com", then		INTERNAL_DNS_DOMAIN attribute specifies "example.com", then
	"example.com", "www.example.com" and "mail.eng.example.com" MUST be		"example.com", "www.example.com" and "mail.eng.example.com" MUST be
	resolved using the internal DNS resolver(s), but "anotherexample.com"		resolved using the internal DNS resolver(s), but "anotherexample.com"
	and "ample.com" SHOULD NOT be resolved using the internal resolver		and "ample.com" SHOULD NOT be resolved using the internal resolver
	and SHOULD use the system's external DNS resolver(s).		and SHOULD use the system's external DNS resolver(s).
	When an IKE SA is terminated, the DNS forwarding must be		When an IKE SA is terminated, the DNS forwarding MUST be
	unconfigured. The DNS forwarding itself MUST be be deleted. All		unconfigured. This includes deleting the DNS forwarding rules;
	cached data of the INTERNAL_DNS_DOMAIN provided DNS domainis MUST be		flushing all cached data for DNS domains provided by the
	flushed. This includes negative cache entries. Obtained DNSSEC		INTERNAL_DNS_DOMAIN attribute, including negative cache entries;
	trust anchors MUST be removed from the list of trust anchors. The		removing any obtained DNSSEC trust anchors from the list of trust
	outstanding DNS request queue MUST be cleared.		anchors; and clearing the outstanding DNS request queue.
	INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA attributes SHOULD only be		INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA attributes SHOULD only be
	used on split tunnel configurations where only a subset of traffic is		used on split tunnel configurations where only a subset of traffic is
	routed into a private remote network using the IPsec connection. If		routed into a private remote network using the IPsec connection. If
	all traffic is routed over the IPsec connection, the existing global		all traffic is routed over the IPsec connection, the existing global
	INTERNAL_IP4_DNS and INTERNAL_IP6_DNS can be used without creating		INTERNAL_IP4_DNS and INTERNAL_IP6_DNS can be used without creating
	specific DNS exemptions.		specific DNS exemptions.
	6. Security Considerations		6. Security Considerations
	The use of Split DNS configurations assigned by an IKEv2 responder is		The use of Split DNS configurations assigned by an IKEv2 responder is
	predicated on the trust established during IKE SA authentication.		predicated on the trust established during IKE SA authentication.
	However, if IKEv2 is being negotiated with an anonymous or unknown		However, if IKEv2 is being negotiated with an anonymous or unknown
	endpoint (such as for Opportunistic Security [RFC7435]), the		endpoint (such as for Opportunistic Security [RFC7435]), the
	initiator MUST ignore Split DNS configurations assigned by the		initiator MUST ignore Split DNS configurations assigned by the
	responder.		responder.
	If a host connected to an authenticated IKE peer is connecting to		If a host connected to an authenticated IKE peer is connecting to
	another IKE peer that attempts to claim the same domain via the		another IKE peer that attempts to claim the same domain via the
	INTERNAL_DNS_DOMAIN attribute, the IKE connection should only process		INTERNAL_DNS_DOMAIN attribute, the IKE connection SHOULD only process
	the DNS information if the two connections are part of the same		the DNS information if the two connections are part of the same
	logical entity. Otherwise, the client should refuse the DNS		logical entity. Otherwise, the client SHOULD refuse the DNS
	information and potentially warn the enduser.		information and potentially warn the end-user.
	INTERNAL_DNSSEC_TA payloads MUST immediately follow an		INTERNAL_DNSSEC_TA payloads MUST immediately follow an
	INTERNAL_DNS_DOMAIN payload. As the INTERNAL_DNSSEC_TA format itself		INTERNAL_DNS_DOMAIN payload. As the INTERNAL_DNSSEC_TA format itself
	does not contain the domain name, it relies on the preceding		does not contain the domain name, it relies on the preceding
	INTERNAL_DNS_DOMAIN to provide the domain for which it specifies the		INTERNAL_DNS_DOMAIN to provide the domain for which it specifies the
	trust anchor.		trust anchor.
	If the initiator is using DNSSEC validation for a domain in its		If the initiator is using DNSSEC validation for a domain in its
	public DNS view, and it requests and receives an INTERNAL_DNS_DOMAIN		public DNS view, and it requests and receives an INTERNAL_DNS_DOMAIN
	attribute without an INTERNAL_DNSSEC_TA, it will need to reconfigure		attribute without an INTERNAL_DNSSEC_TA, it will need to reconfigure
	its DNS resolver to allow for an insecure delegation. It SHOULD NOT		its DNS resolver to allow for an insecure delegation. It SHOULD NOT
	accept insecure delegations for domains that are DNSSEC signed in the		accept insecure delegations for domains that are DNSSEC signed in the
	public DNS view, for which it has not explicitely requested such		public DNS view, for which it has not explicitely requested such
	deletation by specifying the domain specifically using a		deletation by specifying the domain specifically using a
	INTERNAL_DNS_DOMAIN(domain) request.		INTERNAL_DNS_DOMAIN(domain) request.
	A domain that is served via INTERNAL_DNS_DOMAIN should pay close		Deployments that configure INTERNAL_DNS_DOMAIN domains should pay
	attention to their use of indirect reference RRtypes such as CNAME,		close attention to their use of indirect reference RRtypes such as
	DNAME, MX or SRV records so that resolving works as intended when		CNAME, DNAME, MX or SRV records so that resolving works as intended
	all, some or none of the IPsec connections are established.		when all, some, or none of the IPsec connections are established.
	The content of INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA may be		The content of INTERNAL_DNS_DOMAIN and INTERNAL_DNSSEC_TA may be
	passed to another (DNS) program for processing. As with any network		passed to another (DNS) program for processing. As with any network
	input, the content should be considered untrusted and handled		input, the content SHOULD be considered untrusted and handled
	accordingly.		accordingly.
	7. IANA Considerations		7. IANA Considerations
	This document defines two new IKEv2 Configuration Payload Attribute		This document defines two new IKEv2 Configuration Payload Attribute
	Types, which are allocated from the "IKEv2 Configuration Payload		Types, which are allocated from the "IKEv2 Configuration Payload
	Attribute Types" namespace.		Attribute Types" namespace.
	Multi-		Multi-
	Value Attribute Type Valued Length Reference		Value Attribute Type Valued Length Reference
	skipping to change at page 10, line 40 ¶		skipping to change at page 11, line 24 ¶
	8.1. Normative References		8.1. Normative References
	[RFC1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,		[RFC1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,
	and E. Lear, "Address Allocation for Private Internets",		and E. Lear, "Address Allocation for Private Internets",
	BCP 5, RFC 1918, DOI 10.17487/RFC1918, February 1996,		BCP 5, RFC 1918, DOI 10.17487/RFC1918, February 1996,
	<https://www.rfc-editor.org/info/rfc1918>.		<https://www.rfc-editor.org/info/rfc1918>.
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997, <https://www.rfc-		DOI 10.17487/RFC2119, March 1997,
	editor.org/info/rfc2119>.		<https://www.rfc-editor.org/info/rfc2119>.
	[RFC4034] Arends, R., Austein, R., Larson, M., Massey, D., and S.		[RFC4034] Arends, R., Austein, R., Larson, M., Massey, D., and S.
	Rose, "Resource Records for the DNS Security Extensions",		Rose, "Resource Records for the DNS Security Extensions",
	RFC 4034, DOI 10.17487/RFC4034, March 2005,		RFC 4034, DOI 10.17487/RFC4034, March 2005,
	<https://www.rfc-editor.org/info/rfc4034>.		<https://www.rfc-editor.org/info/rfc4034>.
	[RFC5890] Klensin, J., "Internationalized Domain Names for		[RFC5890] Klensin, J., "Internationalized Domain Names for
	Applications (IDNA): Definitions and Document Framework",		Applications (IDNA): Definitions and Document Framework",
	RFC 5890, DOI 10.17487/RFC5890, August 2010,		RFC 5890, DOI 10.17487/RFC5890, August 2010,
	<https://www.rfc-editor.org/info/rfc5890>.		<https://www.rfc-editor.org/info/rfc5890>.
	[RFC7296] Kaufman, C., Hoffman, P., Nir, Y., Eronen, P., and T.		[RFC7296] Kaufman, C., Hoffman, P., Nir, Y., Eronen, P., and T.
	Kivinen, "Internet Key Exchange Protocol Version 2		Kivinen, "Internet Key Exchange Protocol Version 2
	(IKEv2)", STD 79, RFC 7296, DOI 10.17487/RFC7296, October		(IKEv2)", STD 79, RFC 7296, DOI 10.17487/RFC7296, October
	2014, <https://www.rfc-editor.org/info/rfc7296>.		2014, <https://www.rfc-editor.org/info/rfc7296>.
			[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
			2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
			May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	8.2. Informative References		8.2. Informative References
	[RFC2775] Carpenter, B., "Internet Transparency", RFC 2775,		[RFC2775] Carpenter, B., "Internet Transparency", RFC 2775,
	DOI 10.17487/RFC2775, February 2000, <https://www.rfc-		DOI 10.17487/RFC2775, February 2000,
	editor.org/info/rfc2775>.		<https://www.rfc-editor.org/info/rfc2775>.
	[RFC7435] Dukhovni, V., "Opportunistic Security: Some Protection		[RFC7435] Dukhovni, V., "Opportunistic Security: Some Protection
	Most of the Time", RFC 7435, DOI 10.17487/RFC7435,		Most of the Time", RFC 7435, DOI 10.17487/RFC7435,
	December 2014, <https://www.rfc-editor.org/info/rfc7435>.		December 2014, <https://www.rfc-editor.org/info/rfc7435>.
	Authors' Addresses		Authors' Addresses
	Tommy Pauly		Tommy Pauly
	Apple Inc.		Apple Inc.
	1 Infinite Loop		One Apple Park Way
	Cupertino, California 95014		Cupertino, California 95014
	US		US
	Email: tpauly@apple.com		Email: tpauly@apple.com
	Paul Wouters		Paul Wouters
	Red Hat		Red Hat
	Email: pwouters@redhat.com		Email: pwouters@redhat.com
End of changes. 37 change blocks.
	71 lines changed or deleted		81 lines changed or added
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