draft-ietf-httpbis-p7-auth-05.txt		draft-ietf-httpbis-p7-auth-06.txt
	Network Working Group R. Fielding, Ed.		HTTPbis Working Group R. Fielding, Ed.
	Internet-Draft Day Software		Internet-Draft Day Software
	Obsoletes: 2616 (if approved) J. Gettys		Obsoletes: 2616 (if approved) J. Gettys
	Updates: 2617 (if approved) One Laptop per Child		Updates: 2617 (if approved) One Laptop per Child
	Intended status: Standards Track J. Mogul		Intended status: Standards Track J. Mogul
	Expires: May 20, 2009 HP		Expires: September 10, 2009 HP
	H. Frystyk		H. Frystyk
	Microsoft		Microsoft
	L. Masinter		L. Masinter
	Adobe Systems		Adobe Systems
	P. Leach		P. Leach
	Microsoft		Microsoft
	T. Berners-Lee		T. Berners-Lee
	W3C/MIT		W3C/MIT
	Y. Lafon, Ed.		Y. Lafon, Ed.
	W3C		W3C
	J. Reschke, Ed.		J. Reschke, Ed.
	greenbytes		greenbytes
	November 16, 2008		March 9, 2009
	HTTP/1.1, part 7: Authentication		HTTP/1.1, part 7: Authentication
	draft-ietf-httpbis-p7-auth-05		draft-ietf-httpbis-p7-auth-06
	Status of this Memo		Status of this Memo
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	Abstract		Abstract
	The Hypertext Transfer Protocol (HTTP) is an application-level		The Hypertext Transfer Protocol (HTTP) is an application-level
	protocol for distributed, collaborative, hypermedia information		protocol for distributed, collaborative, hypermedia information
	systems. HTTP has been in use by the World Wide Web global		systems. HTTP has been in use by the World Wide Web global
	information initiative since 1990. This document is Part 7 of the		information initiative since 1990. This document is Part 7 of the
	seven-part specification that defines the protocol referred to as		seven-part specification that defines the protocol referred to as
	"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 7 defines		"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 7 defines
	HTTP Authentication.		HTTP Authentication.
	Editorial Note (To be removed by RFC Editor)		Editorial Note (To be removed by RFC Editor)
	Discussion of this draft should take place on the HTTPBIS working		Discussion of this draft should take place on the HTTPBIS working
	group mailing list (ietf-http-wg@w3.org). The current issues list is		group mailing list (ietf-http-wg@w3.org). The current issues list is
	at <http://tools.ietf.org/wg/httpbis/trac/report/11> and related		at <http://tools.ietf.org/wg/httpbis/trac/report/11> and related
	documents (including fancy diffs) can be found at		documents (including fancy diffs) can be found at
	<http://tools.ietf.org/wg/httpbis/>.		<http://tools.ietf.org/wg/httpbis/>.
	The changes in this draft are summarized in Appendix B.6.		The changes in this draft are summarized in Appendix C.7.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
	1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4		1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4
	2. Notational Conventions and Generic Grammar . . . . . . . . . . 4		1.2. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 4
	3. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5		1.2.1. Core Rules . . . . . . . . . . . . . . . . . . . . . . 5
	3.1. 401 Unauthorized . . . . . . . . . . . . . . . . . . . . . 5		1.2.2. ABNF Rules defined in other Parts of the
	3.2. 407 Proxy Authentication Required . . . . . . . . . . . . 5		Specification . . . . . . . . . . . . . . . . . . . . 5
	4. Header Field Definitions . . . . . . . . . . . . . . . . . . . 5		2. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5
	4.1. Authorization . . . . . . . . . . . . . . . . . . . . . . 5		2.1. 401 Unauthorized . . . . . . . . . . . . . . . . . . . . . 5
	4.2. Proxy-Authenticate . . . . . . . . . . . . . . . . . . . . 6		2.2. 407 Proxy Authentication Required . . . . . . . . . . . . 5
	4.3. Proxy-Authorization . . . . . . . . . . . . . . . . . . . 7		3. Header Field Definitions . . . . . . . . . . . . . . . . . . . 5
	4.4. WWW-Authenticate . . . . . . . . . . . . . . . . . . . . . 7		3.1. Authorization . . . . . . . . . . . . . . . . . . . . . . 6
	5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7		3.2. Proxy-Authenticate . . . . . . . . . . . . . . . . . . . . 7
	5.1. Message Header Registration . . . . . . . . . . . . . . . 8		3.3. Proxy-Authorization . . . . . . . . . . . . . . . . . . . 7
	6. Security Considerations . . . . . . . . . . . . . . . . . . . 8		3.4. WWW-Authenticate . . . . . . . . . . . . . . . . . . . . . 7
	6.1. Authentication Credentials and Idle Clients . . . . . . . 8		4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
	7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9		4.1. Message Header Registration . . . . . . . . . . . . . . . 8
	8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9		5. Security Considerations . . . . . . . . . . . . . . . . . . . 8
	8.1. Normative References . . . . . . . . . . . . . . . . . . . 9		5.1. Authentication Credentials and Idle Clients . . . . . . . 8
	8.2. Informative References . . . . . . . . . . . . . . . . . . 9		6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
			7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
			7.1. Normative References . . . . . . . . . . . . . . . . . . . 9
			7.2. Informative References . . . . . . . . . . . . . . . . . . 10
	Appendix A. Compatibility with Previous Versions . . . . . . . . 10		Appendix A. Compatibility with Previous Versions . . . . . . . . 10
	A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 10		A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 10
	Appendix B. Change Log (to be removed by RFC Editor before		Appendix B. Collected ABNF . . . . . . . . . . . . . . . . . . . 10
	publication) . . . . . . . . . . . . . . . . . . . . 10		Appendix C. Change Log (to be removed by RFC Editor before
	B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 10		publication) . . . . . . . . . . . . . . . . . . . . 11
	B.2. Since draft-ietf-httpbis-p7-auth-00 . . . . . . . . . . . 10		C.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 11
	B.3. Since draft-ietf-httpbis-p7-auth-01 . . . . . . . . . . . 10		C.2. Since draft-ietf-httpbis-p7-auth-00 . . . . . . . . . . . 11
	B.4. Since draft-ietf-httpbis-p7-auth-02 . . . . . . . . . . . 10		C.3. Since draft-ietf-httpbis-p7-auth-01 . . . . . . . . . . . 11
	B.5. Since draft-ietf-httpbis-p7-auth-03 . . . . . . . . . . . 10		C.4. Since draft-ietf-httpbis-p7-auth-02 . . . . . . . . . . . 11
	B.6. Since draft-ietf-httpbis-p7-auth-04 . . . . . . . . . . . 10		C.5. Since draft-ietf-httpbis-p7-auth-03 . . . . . . . . . . . 11
	Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11		C.6. Since draft-ietf-httpbis-p7-auth-04 . . . . . . . . . . . 11
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11		C.7. Since draft-ietf-httpbis-p7-auth-05 . . . . . . . . . . . 12
	Intellectual Property and Copyright Statements . . . . . . . . . . 15		Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
			Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13
	1. Introduction		1. Introduction
	This document defines HTTP/1.1 access control and authentication.		This document defines HTTP/1.1 access control and authentication.
	Right now it includes the extracted relevant sections of RFC 2616		Right now it includes the extracted relevant sections of RFC 2616
	with only minor changes. The intention is to move the general		with only minor changes. The intention is to move the general
	framework for HTTP authentication here, as currently specified in		framework for HTTP authentication here, as currently specified in
	[RFC2617], and allow the individual authentication mechanisms to be		[RFC2617], and allow the individual authentication mechanisms to be
	defined elsewhere. This introduction will be rewritten when that		defined elsewhere. This introduction will be rewritten when that
	occurs.		occurs.
	skipping to change at page 4, line 39		skipping to change at page 4, line 39
	An implementation is not compliant if it fails to satisfy one or more		An implementation is not compliant if it fails to satisfy one or more
	of the MUST or REQUIRED level requirements for the protocols it		of the MUST or REQUIRED level requirements for the protocols it
	implements. An implementation that satisfies all the MUST or		implements. An implementation that satisfies all the MUST or
	REQUIRED level and all the SHOULD level requirements for its		REQUIRED level and all the SHOULD level requirements for its
	protocols is said to be "unconditionally compliant"; one that		protocols is said to be "unconditionally compliant"; one that
	satisfies all the MUST level requirements but not all the SHOULD		satisfies all the MUST level requirements but not all the SHOULD
	level requirements for its protocols is said to be "conditionally		level requirements for its protocols is said to be "conditionally
	compliant."		compliant."
	2. Notational Conventions and Generic Grammar		1.2. Syntax Notation
	This specification uses the ABNF syntax defined in Section 2.1 of		This specification uses the ABNF syntax defined in Section 1.2 of
	[Part1].		[Part1] (which extends the syntax defined in [RFC5234] with a list
			rule). Appendix B shows the collected ABNF, with the list rule
			expanded.
	The ABNF rules below are defined in other specifications:		The following core rules are included by reference, as defined in
			[RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF
			(CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),
			HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit
			sequence of data), SP (space), VCHAR (any visible USASCII character),
			and WSP (whitespace).
	OWS = <OWS, defined in [Part1], Section 2.2>		1.2.1. Core Rules
			The core rules below are defined in Section 1.2.2 of [Part1]:
			OWS = <OWS, defined in [Part1], Section 1.2.2>
			1.2.2. ABNF Rules defined in other Parts of the Specification
			The ABNF rules below are defined in other specifications:
	challenge = <challenge, defined in [RFC2617], Section 1.2>		challenge = <challenge, defined in [RFC2617], Section 1.2>
	credentials = <credentials, defined in [RFC2617], Section 1.2>		credentials = <credentials, defined in [RFC2617], Section 1.2>
	3. Status Code Definitions		2. Status Code Definitions
	3.1. 401 Unauthorized		2.1. 401 Unauthorized
	The request requires user authentication. The response MUST include		The request requires user authentication. The response MUST include
	a WWW-Authenticate header field (Section 4.4) containing a challenge		a WWW-Authenticate header field (Section 3.4) containing a challenge
	applicable to the requested resource. The client MAY repeat the		applicable to the requested resource. The client MAY repeat the
	request with a suitable Authorization header field (Section 4.1). If		request with a suitable Authorization header field (Section 3.1). If
	the request already included Authorization credentials, then the 401		the request already included Authorization credentials, then the 401
	response indicates that authorization has been refused for those		response indicates that authorization has been refused for those
	credentials. If the 401 response contains the same challenge as the		credentials. If the 401 response contains the same challenge as the
	prior response, and the user agent has already attempted		prior response, and the user agent has already attempted
	authentication at least once, then the user SHOULD be presented the		authentication at least once, then the user SHOULD be presented the
	entity that was given in the response, since that entity might		entity that was given in the response, since that entity might
	include relevant diagnostic information. HTTP access authentication		include relevant diagnostic information. HTTP access authentication
	is explained in "HTTP Authentication: Basic and Digest Access		is explained in "HTTP Authentication: Basic and Digest Access
	Authentication" [RFC2617].		Authentication" [RFC2617].
	3.2. 407 Proxy Authentication Required		2.2. 407 Proxy Authentication Required
	This code is similar to 401 (Unauthorized), but indicates that the		This code is similar to 401 (Unauthorized), but indicates that the
	client must first authenticate itself with the proxy. The proxy MUST		client must first authenticate itself with the proxy. The proxy MUST
	return a Proxy-Authenticate header field (Section 4.2) containing a		return a Proxy-Authenticate header field (Section 3.2) containing a
	challenge applicable to the proxy for the requested resource. The		challenge applicable to the proxy for the requested resource. The
	client MAY repeat the request with a suitable Proxy-Authorization		client MAY repeat the request with a suitable Proxy-Authorization
	header field (Section 4.3). HTTP access authentication is explained		header field (Section 3.3). HTTP access authentication is explained
	in "HTTP Authentication: Basic and Digest Access Authentication"		in "HTTP Authentication: Basic and Digest Access Authentication"
	[RFC2617].		[RFC2617].
	4. Header Field Definitions		3. Header Field Definitions
	This section defines the syntax and semantics of HTTP/1.1 header		This section defines the syntax and semantics of HTTP/1.1 header
	fields related to authentication.		fields related to authentication.
	4.1. Authorization		3.1. Authorization
	A user agent that wishes to authenticate itself with a server--		A user agent that wishes to authenticate itself with a server--
	usually, but not necessarily, after receiving a 401 response--does so		usually, but not necessarily, after receiving a 401 response--does so
	by including an Authorization request-header field with the request.		by including an Authorization request-header field with the request.
	The field "Authorization" consists of credentials containing the		The field "Authorization" consists of credentials containing the
	authentication information of the user agent for the realm of the		authentication information of the user agent for the realm of the
	resource being requested.		resource being requested.
	Authorization = "Authorization" ":" OWS Authorization-v		Authorization = "Authorization" ":" OWS Authorization-v
	Authorization-v = credentials		Authorization-v = credentials
	skipping to change at page 6, line 4		skipping to change at page 6, line 18
	usually, but not necessarily, after receiving a 401 response--does so		usually, but not necessarily, after receiving a 401 response--does so
	by including an Authorization request-header field with the request.		by including an Authorization request-header field with the request.
	The field "Authorization" consists of credentials containing the		The field "Authorization" consists of credentials containing the
	authentication information of the user agent for the realm of the		authentication information of the user agent for the realm of the
	resource being requested.		resource being requested.
	Authorization = "Authorization" ":" OWS Authorization-v		Authorization = "Authorization" ":" OWS Authorization-v
	Authorization-v = credentials		Authorization-v = credentials
	HTTP access authentication is described in "HTTP Authentication:		HTTP access authentication is described in "HTTP Authentication:
	Basic and Digest Access Authentication" [RFC2617]. If a request is		Basic and Digest Access Authentication" [RFC2617]. If a request is
	authenticated and a realm specified, the same credentials SHOULD be		authenticated and a realm specified, the same credentials SHOULD be
	valid for all other requests within this realm (assuming that the		valid for all other requests within this realm (assuming that the
	authentication scheme itself does not require otherwise, such as		authentication scheme itself does not require otherwise, such as
	credentials that vary according to a challenge value or using		credentials that vary according to a challenge value or using
	synchronized clocks).		synchronized clocks).
	When a shared cache (see Section 9 of [Part6]) receives a request		When a shared cache (see Section 1.2 of [Part6]) receives a request
	containing an Authorization field, it MUST NOT return the		containing an Authorization field, it MUST NOT return the
	corresponding response as a reply to any other request, unless one of		corresponding response as a reply to any other request, unless one of
	the following specific exceptions holds:		the following specific exceptions holds:
	1. If the response includes the "s-maxage" cache-control directive,		1. If the response includes the "s-maxage" cache-control directive,
	the cache MAY use that response in replying to a subsequent		the cache MAY use that response in replying to a subsequent
	request. But (if the specified maximum age has passed) a proxy		request. But (if the specified maximum age has passed) a proxy
	cache MUST first revalidate it with the origin server, using the		cache MUST first revalidate it with the origin server, using the
	request-headers from the new request to allow the origin server		request-headers from the new request to allow the origin server
	to authenticate the new request. (This is the defined behavior		to authenticate the new request. (This is the defined behavior
	skipping to change at page 6, line 36		skipping to change at page 7, line 5
	2. If the response includes the "must-revalidate" cache-control		2. If the response includes the "must-revalidate" cache-control
	directive, the cache MAY use that response in replying to a		directive, the cache MAY use that response in replying to a
	subsequent request. But if the response is stale, all caches		subsequent request. But if the response is stale, all caches
	MUST first revalidate it with the origin server, using the		MUST first revalidate it with the origin server, using the
	request-headers from the new request to allow the origin server		request-headers from the new request to allow the origin server
	to authenticate the new request.		to authenticate the new request.
	3. If the response includes the "public" cache-control directive, it		3. If the response includes the "public" cache-control directive, it
	MAY be returned in reply to any subsequent request.		MAY be returned in reply to any subsequent request.
	4.2. Proxy-Authenticate		3.2. Proxy-Authenticate
	The response-header field "Proxy-Authenticate" MUST be included as		The response-header field "Proxy-Authenticate" MUST be included as
	part of a 407 (Proxy Authentication Required) response. The field		part of a 407 (Proxy Authentication Required) response. The field
	value consists of a challenge that indicates the authentication		value consists of a challenge that indicates the authentication
	scheme and parameters applicable to the proxy for this Request-URI.		scheme and parameters applicable to the proxy for this request-
			target.
	Proxy-Authenticate = "Proxy-Authenticate" ":" OWS		Proxy-Authenticate = "Proxy-Authenticate" ":" OWS
	Proxy-Authenticate-v		Proxy-Authenticate-v
	Proxy-Authenticate-v = 1#challenge		Proxy-Authenticate-v = 1#challenge
	The HTTP access authentication process is described in "HTTP		The HTTP access authentication process is described in "HTTP
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	Unlike WWW-Authenticate, the Proxy-Authenticate header field applies		Unlike WWW-Authenticate, the Proxy-Authenticate header field applies
	only to the current connection and SHOULD NOT be passed on to		only to the current connection and SHOULD NOT be passed on to
	downstream clients. However, an intermediate proxy might need to		downstream clients. However, an intermediate proxy might need to
	obtain its own credentials by requesting them from the downstream		obtain its own credentials by requesting them from the downstream
	client, which in some circumstances will appear as if the proxy is		client, which in some circumstances will appear as if the proxy is
	forwarding the Proxy-Authenticate header field.		forwarding the Proxy-Authenticate header field.
	4.3. Proxy-Authorization		3.3. Proxy-Authorization
	The request-header field "Proxy-Authorization" allows the client to		The request-header field "Proxy-Authorization" allows the client to
	identify itself (or its user) to a proxy which requires		identify itself (or its user) to a proxy which requires
	authentication. The Proxy-Authorization field value consists of		authentication. The Proxy-Authorization field value consists of
	credentials containing the authentication information of the user		credentials containing the authentication information of the user
	agent for the proxy and/or realm of the resource being requested.		agent for the proxy and/or realm of the resource being requested.
	Proxy-Authorization = "Proxy-Authorization" ":" OWS		Proxy-Authorization = "Proxy-Authorization" ":" OWS
	Proxy-Authorization-v		Proxy-Authorization-v
	Proxy-Authorization-v = credentials		Proxy-Authorization-v = credentials
	skipping to change at page 7, line 30		skipping to change at page 7, line 49
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	Unlike Authorization, the Proxy-Authorization header field applies		Unlike Authorization, the Proxy-Authorization header field applies
	only to the next outbound proxy that demanded authentication using		only to the next outbound proxy that demanded authentication using
	the Proxy-Authenticate field. When multiple proxies are used in a		the Proxy-Authenticate field. When multiple proxies are used in a
	chain, the Proxy-Authorization header field is consumed by the first		chain, the Proxy-Authorization header field is consumed by the first
	outbound proxy that was expecting to receive credentials. A proxy		outbound proxy that was expecting to receive credentials. A proxy
	MAY relay the credentials from the client request to the next proxy		MAY relay the credentials from the client request to the next proxy
	if that is the mechanism by which the proxies cooperatively		if that is the mechanism by which the proxies cooperatively
	authenticate a given request.		authenticate a given request.
	4.4. WWW-Authenticate		3.4. WWW-Authenticate
	The WWW-Authenticate response-header field MUST be included in 401		The WWW-Authenticate response-header field MUST be included in 401
	(Unauthorized) response messages. The field value consists of at		(Unauthorized) response messages. The field value consists of at
	least one challenge that indicates the authentication scheme(s) and		least one challenge that indicates the authentication scheme(s) and
	parameters applicable to the Request-URI.		parameters applicable to the request-target.
	WWW-Authenticate = "WWW-Authenticate" ":" OWS WWW-Authenticate-v		WWW-Authenticate = "WWW-Authenticate" ":" OWS WWW-Authenticate-v
	WWW-Authenticate-v = 1#challenge		WWW-Authenticate-v = 1#challenge
	The HTTP access authentication process is described in "HTTP		The HTTP access authentication process is described in "HTTP
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	User agents are advised to take special care in parsing the WWW-		User agents are advised to take special care in parsing the WWW-
	Authenticate field value as it might contain more than one challenge,		Authenticate field value as it might contain more than one challenge,
	or if more than one WWW-Authenticate header field is provided, the		or if more than one WWW-Authenticate header field is provided, the
	contents of a challenge itself can contain a comma-separated list of		contents of a challenge itself can contain a comma-separated list of
	authentication parameters.		authentication parameters.
	5. IANA Considerations		4. IANA Considerations
	5.1. Message Header Registration		4.1. Message Header Registration
	The Message Header Registry located at <http://www.iana.org/		The Message Header Registry located at <http://www.iana.org/
	assignments/message-headers/message-header-index.html> should be		assignments/message-headers/message-header-index.html> should be
	updated with the permanent registrations below (see [RFC3864]):		updated with the permanent registrations below (see [RFC3864]):
	+---------------------+----------+----------+-------------+		+---------------------+----------+----------+-------------+
	| Header Field Name | Protocol | Status | Reference |		| Header Field Name | Protocol | Status | Reference |
	+---------------------+----------+----------+-------------+		+---------------------+----------+----------+-------------+
	| Authorization | http | standard | Section 4.1 |		| Authorization | http | standard | Section 3.1 |
	| Proxy-Authenticate | http | standard | Section 4.2 |		| Proxy-Authenticate | http | standard | Section 3.2 |
	| Proxy-Authorization | http | standard | Section 4.3 |		| Proxy-Authorization | http | standard | Section 3.3 |
	| WWW-Authenticate | http | standard | Section 4.4 |		| WWW-Authenticate | http | standard | Section 3.4 |
	+---------------------+----------+----------+-------------+		+---------------------+----------+----------+-------------+
	The change controller is: "IETF (iesg@ietf.org) - Internet		The change controller is: "IETF (iesg@ietf.org) - Internet
	Engineering Task Force".		Engineering Task Force".
	6. Security Considerations		5. Security Considerations
	This section is meant to inform application developers, information		This section is meant to inform application developers, information
	providers, and users of the security limitations in HTTP/1.1 as		providers, and users of the security limitations in HTTP/1.1 as
	described by this document. The discussion does not include		described by this document. The discussion does not include
	definitive solutions to the problems revealed, though it does make		definitive solutions to the problems revealed, though it does make
	some suggestions for reducing security risks.		some suggestions for reducing security risks.
	6.1. Authentication Credentials and Idle Clients		5.1. Authentication Credentials and Idle Clients
	Existing HTTP clients and user agents typically retain authentication		Existing HTTP clients and user agents typically retain authentication
	information indefinitely. HTTP/1.1 does not provide a method for a		information indefinitely. HTTP/1.1 does not provide a method for a
	server to direct clients to discard these cached credentials. This		server to direct clients to discard these cached credentials. This
	is a significant defect that requires further extensions to HTTP.		is a significant defect that requires further extensions to HTTP.
	Circumstances under which credential caching can interfere with the		Circumstances under which credential caching can interfere with the
	application's security model include but are not limited to:		application's security model include but are not limited to:
	o Clients which have been idle for an extended period following		o Clients which have been idle for an extended period following
	which the server might wish to cause the client to reprompt the		which the server might wish to cause the client to reprompt the
	skipping to change at page 9, line 9		skipping to change at page 9, line 26
	for the client to retain the credentials.		for the client to retain the credentials.
	This is currently under separate study. There are a number of work-		This is currently under separate study. There are a number of work-
	arounds to parts of this problem, and we encourage the use of		arounds to parts of this problem, and we encourage the use of
	password protection in screen savers, idle time-outs, and other		password protection in screen savers, idle time-outs, and other
	methods which mitigate the security problems inherent in this		methods which mitigate the security problems inherent in this
	problem. In particular, user agents which cache credentials are		problem. In particular, user agents which cache credentials are
	encouraged to provide a readily accessible mechanism for discarding		encouraged to provide a readily accessible mechanism for discarding
	cached credentials under user control.		cached credentials under user control.
	7. Acknowledgments		6. Acknowledgments
	[[anchor2: TBD.]]		[[anchor2: TBD.]]
	8. References		7. References
	8.1. Normative References		7.1. Normative References
	[Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,		[Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
	Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,		Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
	and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,		and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,
	and Message Parsing", draft-ietf-httpbis-p1-messaging-05		and Message Parsing", draft-ietf-httpbis-p1-messaging-06
	(work in progress), November 2008.		(work in progress), March 2009.
	[Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,		[Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
	Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,		Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
	and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",		and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",
	draft-ietf-httpbis-p6-cache-05 (work in progress),		draft-ietf-httpbis-p6-cache-06 (work in progress),
	November 2008.		March 2009.
	[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, March 1997.		Requirement Levels", BCP 14, RFC 2119, March 1997.
	[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,		[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,
	Leach, P., Luotonen, A., and L. Stewart, "HTTP		Leach, P., Luotonen, A., and L. Stewart, "HTTP
	Authentication: Basic and Digest Access Authentication",		Authentication: Basic and Digest Access Authentication",
	RFC 2617, June 1999.		RFC 2617, June 1999.
	8.2. Informative References		[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
			Specifications: ABNF", STD 68, RFC 5234, January 2008.
			7.2. Informative References
	[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,		[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
	Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext		Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
	Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.		Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
	[RFC3864] Klyne, G., Nottingham, M., and J. Mogul, "Registration		[RFC3864] Klyne, G., Nottingham, M., and J. Mogul, "Registration
	Procedures for Message Header Fields", BCP 90, RFC 3864,		Procedures for Message Header Fields", BCP 90, RFC 3864,
	September 2004.		September 2004.
	Appendix A. Compatibility with Previous Versions		Appendix A. Compatibility with Previous Versions
	A.1. Changes from RFC 2616		A.1. Changes from RFC 2616
	Appendix B. Change Log (to be removed by RFC Editor before publication)		Appendix B. Collected ABNF
	B.1. Since RFC2616		Authorization = "Authorization:" OWS Authorization-v
			Authorization-v = credentials
			OWS = <OWS, defined in [Part1], Section 1.2.2>
			Proxy-Authenticate = "Proxy-Authenticate:" OWS Proxy-Authenticate-v
			Proxy-Authenticate-v = *( "," OWS ) challenge *( OWS "," [ OWS
			challenge ] )
			Proxy-Authorization = "Proxy-Authorization:" OWS
			Proxy-Authorization-v
			Proxy-Authorization-v = credentials
			WWW-Authenticate = "WWW-Authenticate:" OWS WWW-Authenticate-v
			WWW-Authenticate-v = *( "," OWS ) challenge *( OWS "," [ OWS
			challenge ] )
			challenge = <challenge, defined in [RFC2617], Section 1.2>
			credentials = <credentials, defined in [RFC2617], Section 1.2>
			ABNF diagnostics:
			; Authorization defined but not used
			; Proxy-Authenticate defined but not used
			; Proxy-Authorization defined but not used
			; WWW-Authenticate defined but not used
			Appendix C. Change Log (to be removed by RFC Editor before publication)
			C.1. Since RFC2616
	Extracted relevant partitions from [RFC2616].		Extracted relevant partitions from [RFC2616].
	B.2. Since draft-ietf-httpbis-p7-auth-00		C.2. Since draft-ietf-httpbis-p7-auth-00
	Closed issues:		Closed issues:
	o <http://tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative and		o <http://tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative and
	Informative references"		Informative references"
	B.3. Since draft-ietf-httpbis-p7-auth-01		C.3. Since draft-ietf-httpbis-p7-auth-01
	Ongoing work on ABNF conversion		Ongoing work on ABNF conversion
	(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):		(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):
	o Explicitly import BNF rules for "challenge" and "credentials" from		o Explicitly import BNF rules for "challenge" and "credentials" from
	RFC2617.		RFC2617.
	o Add explicit references to BNF syntax and rules imported from		o Add explicit references to BNF syntax and rules imported from
	other parts of the specification.		other parts of the specification.
	B.4. Since draft-ietf-httpbis-p7-auth-02		C.4. Since draft-ietf-httpbis-p7-auth-02
	Ongoing work on IANA Message Header Registration		Ongoing work on IANA Message Header Registration
	(<http://tools.ietf.org/wg/httpbis/trac/ticket/40>):		(<http://tools.ietf.org/wg/httpbis/trac/ticket/40>):
	o Reference RFC 3984, and update header registrations for headers		o Reference RFC 3984, and update header registrations for headers
	defined in this document.		defined in this document.
	B.5. Since draft-ietf-httpbis-p7-auth-03		C.5. Since draft-ietf-httpbis-p7-auth-03
	B.6. Since draft-ietf-httpbis-p7-auth-04		C.6. Since draft-ietf-httpbis-p7-auth-04
	Ongoing work on ABNF conversion		Ongoing work on ABNF conversion
	(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):		(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):
	o Use "/" instead of "|" for alternatives.		o Use "/" instead of "|" for alternatives.
	o Introduce new ABNF rules for "bad" whitespace ("BWS"), optional		o Introduce new ABNF rules for "bad" whitespace ("BWS"), optional
	whitespace ("OWS") and required whitespace ("RWS").		whitespace ("OWS") and required whitespace ("RWS").
	o Rewrite ABNFs to spell out whitespace rules, factor out header		o Rewrite ABNFs to spell out whitespace rules, factor out header
	value format definitions.		value format definitions.
			C.7. Since draft-ietf-httpbis-p7-auth-05
			Final work on ABNF conversion
			(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):
			o Add appendix containing collected and expanded ABNF, reorganize
			ABNF introduction.
	Index		Index
	4		4
	401 Unauthorized (status code) 5		401 Unauthorized (status code) 5
	407 Proxy Authentication Required (status code) 5		407 Proxy Authentication Required (status code) 5
	A		A
	Authorization header 5		Authorization header 6
	G		G
	Grammar		Grammar
	Authorization 5		Authorization 6
	Authorization-v 5		Authorization-v 6
	challenge 4		challenge 5
	credentials 4		credentials 5
	Proxy-Authenticate 6		Proxy-Authenticate 7
	Proxy-Authenticate-v 6		Proxy-Authenticate-v 7
	Proxy-Authorization 7		Proxy-Authorization 7
	Proxy-Authorization-v 7		Proxy-Authorization-v 7
	WWW-Authenticate 7		WWW-Authenticate 8
	WWW-Authenticate-v 7		WWW-Authenticate-v 8
	H		H
	Headers		Headers
	Authorization 5		Authorization 6
	Proxy-Authenticate 6		Proxy-Authenticate 7
	Proxy-Authorization 7		Proxy-Authorization 7
	WWW-Authenticate 7		WWW-Authenticate 7
	P		P
	Proxy-Authenticate header 6		Proxy-Authenticate header 7
	Proxy-Authorization header 7		Proxy-Authorization header 7
	S		S
	Status Codes		Status Codes
	401 Unauthorized 5		401 Unauthorized 5
	407 Proxy Authentication Required 5		407 Proxy Authentication Required 5
	W		W
	WWW-Authenticate header 7		WWW-Authenticate header 7
	skipping to change at page 15, line 4		skipping to change at line 634
	Julian F. Reschke (editor)		Julian F. Reschke (editor)
	greenbytes GmbH		greenbytes GmbH
	Hafenweg 16		Hafenweg 16
	Muenster, NW 48155		Muenster, NW 48155
	Germany		Germany
	Phone: +49 251 2807760		Phone: +49 251 2807760
	Fax: +49 251 2807761		Fax: +49 251 2807761
	Email: julian.reschke@greenbytes.de		Email: julian.reschke@greenbytes.de
	URI: http://greenbytes.de/tech/webdav/		URI: http://greenbytes.de/tech/webdav/
	Full Copyright Statement
	Copyright (C) The IETF Trust (2008).
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	contained in BCP 78, and except as set forth therein, the authors
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