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[bug-mailutils] sieve and mime
From: |
Alfred M. Szmidt |
Subject: |
[bug-mailutils] sieve and mime |
Date: |
Wed, 29 Jul 2009 02:51:19 -0400 |
Does sieve implement the IETF draft of `Sieve MIME operations'?
===File ~/draft-ietf-sieve-mime-loop-09.txt=================
Internet Engineering Task Force T. Hansen
Internet-Draft AT&T Laboratories
Intended status: Standards Track C. Daboo
Expires: January 14, 2010 Apple Inc.
July 13, 2009
Sieve Email Filtering: MIME part Tests, Iteration, Extraction,
Replacement and Enclosure
draft-ietf-sieve-mime-loop-09
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. This document may contain material
from IETF Documents or IETF Contributions published or made publicly
available before November 10, 2008. The person(s) controlling the
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Trust the right to allow modifications of such material outside the
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the person(s) controlling the copyright in such materials, this
document may not be modified outside the IETF Standards Process, and
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This Internet-Draft will expire on January 14, 2010.
Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved.
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This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
Abstract
This document defines extensions to the Sieve email filtering
language to permit analysis and manipulation of the MIME body parts
of an email message.
Note
This document is being discussed on the MTA-FILTERS mailing list,
address@hidden
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions Used in This Document . . . . . . . . . . . . . . 4
3. Sieve Loops: Actions "foreverypart" and "break" . . . . . . . 4
4. Changes to Sieve Tests . . . . . . . . . . . . . . . . . . . . 5
4.1. Test "header" . . . . . . . . . . . . . . . . . . . . . . 5
4.2. Test "address" . . . . . . . . . . . . . . . . . . . . . 8
4.3. Test "exists" . . . . . . . . . . . . . . . . . . . . . . 9
5. Action "replace" . . . . . . . . . . . . . . . . . . . . . . . 9
6. Action "enclose" . . . . . . . . . . . . . . . . . . . . . . . 11
7. Action "extracttext" . . . . . . . . . . . . . . . . . . . . . 12
8. Sieve Capability Strings . . . . . . . . . . . . . . . . . . . 12
9. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Example 1 . . . . . . . . . . . . . . . . . . . . . . . . 13
9.2. Example 2 . . . . . . . . . . . . . . . . . . . . . . . . 13
9.3. Example 3 . . . . . . . . . . . . . . . . . . . . . . . . 14
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14
11. Security Considerations . . . . . . . . . . . . . . . . . . . 14
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
12.1. foreverypart capability . . . . . . . . . . . . . . . . . 15
12.2. mime capability . . . . . . . . . . . . . . . . . . . . . 16
12.3. replace capability . . . . . . . . . . . . . . . . . . . 16
12.4. enclose capability . . . . . . . . . . . . . . . . . . . 16
12.5. extracttext capability . . . . . . . . . . . . . . . . . 17
13. Change History . . . . . . . . . . . . . . . . . . . . . . . . 17
13.1. draft-ietf-sieve-mime-09 . . . . . . . . . . . . . . . . 17
13.2. draft-ietf-sieve-mime-08 . . . . . . . . . . . . . . . . 17
13.3. draft-ietf-sieve-mime-07 . . . . . . . . . . . . . . . . 18
13.4. draft-ietf-sieve-mime-06 . . . . . . . . . . . . . . . . 18
13.5. draft-ietf-sieve-mime-05 . . . . . . . . . . . . . . . . 18
13.6. draft-ietf-sieve-mime-04 . . . . . . . . . . . . . . . . 18
13.7. draft-ietf-sieve-mime-03 . . . . . . . . . . . . . . . . 19
13.8. draft-ietf-sieve-mime-02 . . . . . . . . . . . . . . . . 19
13.9. draft-ietf-sieve-mime-01 . . . . . . . . . . . . . . . . 19
13.10. draft-ietf-sieve-mime-00 . . . . . . . . . . . . . . . . 19
13.11. draft-sieve-mime-loop-04 . . . . . . . . . . . . . . . . 20
13.12. draft-hansen-sieve-loop-03 . . . . . . . . . . . . . . . 20
13.13. draft-hansen-sieve-loop-02 . . . . . . . . . . . . . . . 20
13.14. draft-hansen-sieve-loop-01 . . . . . . . . . . . . . . . 20
14. References . . . . . . . . . . . . . . . . . . . . . . . . . . 21
14.1. Normative References . . . . . . . . . . . . . . . . . . 21
14.2. Informative References . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22
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1. Introduction
MIME messages ([RFC2045]) are often complex objects, consisting of
many parts and sub-parts. This extension defines mechanisms for
performing tests on MIME body parts, looping through the MIME body
parts, extracting information from a MIME body part, changing the
contents of a MIME body part, and enclosing the entire message within
a wrapper.
2. Conventions Used in This Document
Conventions for notations are as in [RFC5228] section 1.1.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. Sieve Loops: Actions "foreverypart" and "break"
The base Sieve language has no looping mechanism. Given that
messages may contain multiple parts, in order to support filters that
apply to any and all parts, we introduce a new control command:
"foreverypart", which is an iterator that walks though every MIME
part of a message, including nested parts, depth first, and applies
the commands in the specified block to each of them. The iterator
will start with the first MIME part (as its current context) and will
execute a command block (Sieve commands enclosed by {...}). Upon
completion of this command block, the iterator advances to the next
MIME part (as its current context) and executes the same command
block again.
The iterator can be terminated prematurely by a new Sieve command,
"break".
Usage: foreverypart [":name" string] block
Usage: break [":name" string];
"foreverypart" commands can be nested inside other "foreverypart"
commands. When this occurs, the nested "foreverypart" iterates over
the MIME parts contained within the MIME part currently being
targeted by the nearest enclosing "foreverypart" command. (That is,
the inner loop only operates on children of the bodypart currently
accessed by the outer loop.) If that MIME part is a terminal MIME
part (i.e. does not contain other MIME parts) then the nested
"foreverypart" loop is simply ignored.
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Sieve implementations MAY limit the number of nested loops that occur
within one another, however they MUST support at least one nested
loop inside another loop.
If a name is given to a "break" command, it terminates the closest
enclosing loop with the identical matching name. (If a nested
"foreverypart" name is the same as a "foreverpart" name in an outer
level, the outer level name is hidden.) It is an error if there is
no enclosing loop with that name.
4. Changes to Sieve Tests
This specification extends the base Sieve "header", "address" and
"exists" tests to support targeting those tests at a specific MIME
part or at all MIME parts in the enclosing scope.
4.1. Test "header"
The "header" test is extended with the addition of new ":mime" and
":anychild" tagged arguments and their associated options.
Usage: header [":mime"] [":anychild"] [MIMEOPTS]
[COMPARATOR] [MATCH-TYPE]
<header-names: string-list> <key-list: string-list>
Usage: The definition of [MIMEOPTS] is:
Syntax: ":type" / ":subtype" / ":contenttype" /
":param" <param-list: string-list>
When the ":mime" tagged argument is present in the "header" test, it
will parse the MIME header lines in the message so that tests can be
performed on specific elements.
When used outside the context of a "foreverypart" iterator, and
without an ":anychild" tagged argument, the "header" test will
examine only the outer top-level [RFC5322] headers of the message.
When used inside the context of a "foreverypart" iterator, and
without an ":anychild" tagged argument, the "header" test will
examine the headers associated with the current MIME part context
from the loop.
When used outside the context of a "foreverypart" iterator, and with
an ":anychild" tagged argument, the "header" test will examine all
MIME body parts and return true if any of them satisfies the test.
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When used inside the context of a "foreverypart" iterator, and with
an ":anychild" tagged argument, the "header" test will examine the
current MIME part context and all its nested MIME body parts,
returning true if any of them satisfies the test.
The "header" test with the ":mime" tagged argument can test various
aspects of certain structured MIME headers. Implementations SHOULD
support desegmentation, decoding, and charset translation of
parameter values encoded according to [RFC2231] as part of this test.
Additionally, [RFC2047] describes a process whereby [RFC5322] headers
can be encoded in various ways. That encoding is not strictly
allowed in MIME parameters, however in practice it has been used in
many email implementations. So, SIEVE implementations MAY decode
[RFC2047] encoded words in parameter values as part of this test.
These options are available:
:type for a "Content-Type" MIME header field, parses and tests the
value of the MIME type specified in the header; for a "Content-
Disposition" MIME header field, parses and tests the value of the
disposition specified in the header; for other MIME headers, uses
a blank string for the test
:subtype for a "Content-Type" MIME header field, parses and tests
the value of the MIME subtype specified in the header; for a
"Content-Disposition" MIME header field, uses a blank string for
the test; for other MIME headers, uses a blank string for the test
:contenttype for a "Content-Type" MIME header field, parses and
tests the combined value of the MIME type and subtype specified in
the header; for a "Content-Disposition" MIME header field, behaves
the same as the :type option; for other MIME headers, uses a blank
string for the test
:param parses the header looking for MIME parameters in the header.
The supplied string-list lists the names of any parameters to be
tested. If any one named parameter value matches any of the test
string values, the test will return true.
When the :count option from [RFC5231] is used, the following applies:
a. for :type, :subtype or :contenttype, return a count of the number
of headers that parsed successfully
b. for :param, return a count of the number of parameters with the
given name that were found
Example:
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require ["mime", "fileinto"];
if header :mime :type "Content-Type" "image"
{
fileinto "INBOX.images";
}
In this example, any message that contains a MIME image type part at
the top-level is saved to the mailbox "INBOX.images".
Example:
require ["mime", "fileinto"];
if header :mime :anychild :contenttype
"Content-Type" "text/html"
{
fileinto "INBOX.html";
}
In this example, any message that contains any MIME part with a
content-type of "text/html" is saved to the mailbox "INBOX.html".
Example:
require ["mime", "foreverypart", "fileinto"];
foreverypart
{
if allof (
header :mime :param "filename" :contains
"Content-Disposition" "important",
header :mime :subtype "Content-Type" "pdf",
size :over "100K")
{
fileinto "INBOX.important";
break;
}
}
In this example, any message that contains a MIME part that has a
content-disposition with a filename parameter containing the text
"important", has a content-subtype of "pdf" and is bigger than 100 Kb
is saved to the mailbox "INBOX.important".
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4.2. Test "address"
The "address" test is extended with the addition of new ":mime" and
":anychild" tagged arguments and their associated options.
Usage: address [":mime"] [":anychild"] [COMPARATOR]
[ADDRESS-PART] [MATCH-TYPE]
<header-list: string-list> <key-list: string-list>
When the ":mime" tagged argument is present in the "address" test, it
will parse the MIME header lines as if they were standard address
header lines in a message so that tests can be performed on specific
elements.
The behavior of the ":anychild" tagged argument and the interaction
with the "foreverypart" iterator is the same as for the extended
"header" test Section 4.1.
That is,
the use of "address" with no ":mime" and ":anychild" tagged
argument is the test defined in [RFC5228], i.e. it will *only*
operate on top level header fields, whether it is inside
"foreverypart" or not.
the use of "address" with ":mime" and no ":anychild" operates on
the current MIME part only (or on the top level header fields, if
outside "foreverypart")
the use of "address" with ":mime" and ":anychild" operates on the
current MIME part and all of its descendants
Example:
require ["mime", "fileinto"];
if address :mime :is :all "content-from" "address@hidden"
{
fileinto "INBOX.part-from-tim";
}
In this example, any message that contains a MIME Content-From header
at the top-level matching the text "address@hidden" is saved to the
mailbox "INBOX.part-from-tim".
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4.3. Test "exists"
The "exists" test is extended with the addition of the new ":mime"
and ":anychild" tagged arguments and their associated options.
Usage: exists [":mime"] [":anychild"] <header-names: string-list>
When the ":mime" tagged argument is present in the "exists" test, the
test is extended to check for the existence of MIME headers in MIME
parts.
The behavior of the ":anychild" tagged argument and the interaction
with the "foreverypart" iterator is the same as for the extended
"header" test Section 4.1.
That is,
the use of "exists" with no ":mime" and ":anychild" tagged
argument is the test defined in [RFC5228], i.e. it will *only*
operate on top level header fields, whether it is inside
"foreverypart" or not.
the use of "exists" with ":mime" and no ":anychild" operates on
the current MIME part only (or on the top level header fields, if
outside "foreverypart")
the use of "exists" with ":mime" and ":anychild" operates on the
current MIME part and all of its descendants
Example:
require ["mime", "fileinto"];
if exists :mime :anychild "content-md5"
{
fileinto "INBOX.md5";
}
In this example, any message that contains a MIME Content-MD5 header
in any MIME part is saved to the mailbox "INBOX.md5".
5. Action "replace"
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Usage: replace [":mime"] [":subject" string] [":from" string]
<replacement: string>
The "replace" command is defined to allow a MIME part to be replaced
with the text supplied in the command.
When used in the context of a "foreverypart" iterator, the MIME part
to be replaced is the "current" MIME part. If the current MIME
context is a multipart MIME part, the entire multipart MIME part is
replaced, which would alter the MIME structure of the message by
eliminating all of the children of the multipart part. (Replacing a
non-multipart MIME part within a "foreverypart" loop context does not
alter the overall message structure.) If the MIME structure is
altered, the change takes effect immediately: the "foreverypart"
iterator that is executing does not go into the no-longer existing
body parts, and subsequent "foreverypart" iterators would use the new
message structure.
When used outside the context of a "foreverypart" loop, the MIME part
to be replaced is the entire message.
If the :mime parameter is not specified, the replacement string is a
text/plain part in UTF-8 [RFC3629].
If the :mime parameter is specified, then the replacement string is,
in fact, a MIME entity as defined in [RFC2045] section 2.4, including
both MIME headers and content.
If the entire message is being replaced, the optional ":subject"
parameter specifies a subject line to attach to the message that is
generated. UTF-8 characters can be used in the string argument;
implementations MUST convert the string to [RFC2047] encoded words if
and only if non-ASCII characters are present. Implementations MUST
preserve the previous Subject header as an Original-Subject header.
Implementations MUST preserve all other header fields from the
original message with the exception of those relating to the MIME
structure that is being replaced.
If the entire message is being replaced, as an indication that the
message is no longer as created by the original author of the
message, the optional ":from" parameter may be used to specify an
alternate address to use in the From field of the message that is
generated. The string must specify a valid [RFC5322] mailbox-list.
Implementations SHOULD check the syntax and generate an error when a
syntactically invalid ":from" parameter is specified.
Implementations MAY also impose restrictions on what addresses can be
specified in a ":from" parameter; it is suggested that values that
fail such a validity check simply be ignored rather than causing the
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replace action to fail. Implementations MUST preserve the previous
From header as an Original-From header.
Implementations that support the "editheader" extension [RFC5293]
MUST ensure that any Original-Subject or Original-From headers added
by the system cannot be modified or removed. Implementations MAY
prevent the addition of Original-Subject and Orignal-From headers via
the "editheader" extension.
If ":mime" is specified and either ":subject" or ":from" is
specified, the ":subject:" or ":from" parameter MUST be ignored.
This SHOULD be flagged as a compilation error.
6. Action "enclose"
Usage: enclose <:subject string> <:headers string-list> string
A new Sieve action command is defined to allow an entire message to
be enclosed as an attachment to a new message. After enclosure,
subsequent actions affecting the message header or content, as well
as tests operating on the MIME structure or accessing MIME header
fields, use the newly created message instead of the original
message; this means that any use of a "replace" action or other
similar actions should be executed before the "enclose" action.
If multiple "enclose" actions are executed by a script, the message
is enclosed multiple times. (If a Sieve script desires to choose
between different enclosures, or wants to delay the enclosure to the
end of the script, it can use variables with appropriate tests
[RFC5229].)
This action does not affect messages that are forwarded via a
"redirect" action.
Specifically, the original message becomes a multipart/mixed message
with two parts: a text/plain portion with the string argument as its
body, and a message/rfc822 portion with the original message
enclosed. The Content-Type: header field becomes multipart/mixed.
The optional Subject: header is specified by the :subject argument;
if not present the subject will be taken from the enclosed message.
Any headers specified by :headers are copied from the old message
into the new message. If not specified by :headers, Date: and From:
headers should be synthesized to reflect the current date and the
user running the Sieve action.
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7. Action "extracttext"
Usage: extracttext [MODIFIER] [":first" number] <varname: string>
The "extracttext" action may be used within the context of a
"foreverypart" loop and is used to store text into a variable as
defined by [RFC5229]. Servers MUST support transcoding of any
textual body part into UTF-8 for use with this action. This requires
decoding any transfer encoding as well as transcoding from the
indicated character set into UTF-8. It stores at most :first
characters of the transcoded content of the current MIME body part in
the variable identified by varname. If the :first parameter is not
present, the whole content of the current MIME body part is stored.
In either case the actually stored data MAY be truncated to conform
to implementation specific limit on variable length and/or on MIME
body part length. If the transfer encoding or character set is
unrecognized by the implementation or recognized but invalid, an
empty string will result.
If "extracttext" is used outside the context of a "foreverypart"
loop, the action will set the variable identified by varname to the
empty string. This SHOULD be flagged as a compilation error.
Modifiers are applied on the extracted text before it is stored in
the variable.
8. Sieve Capability Strings
A Sieve implementation that defines the "foreverypart" and "break"
actions will advertise the capability string "foreverypart".
A Sieve implementation that defines the ":mime" and ":anychild"
tagged arguments to the "header", "address" and "exists" commands
will advertise the capability string "mime".
A Sieve implementation that defines the "replace" action will
advertise the capability string "replace".
A Sieve implementation that defines the "enclose" action will
advertise the capability string "enclose".
A Sieve implementation that defines the "extracttext" action will
advertise the capability string "extracttext". Note that to be
useful, the "extracttext" action also requires the "variables"
[RFC5229] and "foreverypart" capabilities.
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9. Examples
9.1. Example 1
A Sieve script to replace all the Windows executable attachments in a
message would be:
require [ "foreverypart", "mime", "replace" ];
foreverypart
{
if anyof (
header :mime :contenttype :is
"Content-Type" "application/exe",
header :mime :param "filename"
:matches ["Content-Type", "Content-Disposition"] "*.com" )
{
replace "Executable attachment removed by user filter";
}
}
9.2. Example 2
A Sieve script to warn the user about executable attachment types
would be:
require [ "foreverypart", "mime", "enclose" ];
foreverypart
{
if header :mime :param "filename"
:matches ["Content-Type", "Content-Disposition"]
["*.com", "*.exe", "*.vbs", "*.scr",
"*.pif", "*.hta", "*.bat", "*.zip" ]
{
# these attachment types are executable
enclose :subject "Warning" :text
WARNING! The enclosed message contains executable attachments.
These attachments types may contain a computer virus program
that can infect your computer and potentially damage your data.
Before clicking on these message attachments, you should verify
with the sender that this message was sent by them and not a
computer virus.
.
;
break;
}
}
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9.3. Example 3
A Sieve script to extract subject and text out of messages from the
boss:
require ["mime", "variables", "extracttext"];
if header :contains "from" "address@hidden"
{
# :matches is used to get the value of the Subject header
if header :matches "Subject" "*"
{
set "subject" "${1}";
}
# extract the first 100 characters of the first text/* part
foreverypart
{
if header :mime :type :is "Content-Type" "text"
{
extracttext :first 100 "msgcontent";
break;
}
}
# if it's not a 'for your information' message
if not header :contains "subject" "FYI:"
{
# do something using ${subject} and ${msgcontent}
# such as sending a notification using a
# notification extension
}
}
10. Acknowledgements
Comments from members of the MTA Filters Working Group, in particular
Ned Freed, Kjetil Torgrim Homme, Mark Mallett, Alexey Melnikov, Aaron
Stone and Nigel Swinson are gratefully acknowledged.
11. Security Considerations
The "enclose" action creates an entirely new message, as compared to
just redirecting or forwarding the existing message. Therefore, any
site policies applicable to message submission should be enforced.
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The looping specification specified here provides easier access to
information about the message contents, which may also be achieved
through other sieve tests. This is not believed to raise any
additional security issues beyond those for the Sieve "envelope" and
"body" [RFC5173] tests.
Any change in message content may interfere with digital signature
mechanisms that include that content in the signed material. In
particular, using "replace" makes direct changes to the body content
and will affect the body hash included in DKIM signatures [RFC4871],
or the message signature used for S/MIME [RFC3851], PGP [RFC1991] or
OpenPGP [RFC4880].
It is not possible to examine the MIME structure of decrypted content
in a multipart/encrypted MIME part.
When "enclose" is used on a message containing a multipart/signed
MIME part, the SIEVE implementation MUST ensure that the original
message is copied octet-for-octet to maintain the validity of the
digital signature.
The system MUST be sized and restricted in such a manner that even
malicious use of mime part matching does not deny service to other
users of the host system.
All of the security considerations given in the base Sieve
specification also apply to these extensions.
12. IANA Considerations
The Original-Subject: and Original-From: headers are to be registered
in the Permanent Message Header Fields registry.
The following templates specify the IANA registrations of the Sieve
extensions specified in this document. This information should be
added to the IANA registry of Sieve Extensions (currently found at
http://www.iana.org/assignments/sieve-extensions).
[[ RFC Editor Note: replace RFC XXXX with a reference to this RFC. ]]
12.1. foreverypart capability
To: address@hidden
Subject: Registration of new Sieve extension
Capability name: foreverypart
Description: adds the "foreverypart" and "break" actions for
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iterating through MIME parts of a message.
RFC number: RFC XXXX
Contact address: The Sieve discussion list
<address@hidden>.
12.2. mime capability
To: address@hidden
Subject: Registration of new Sieve extension
Capability name: mime
Description: adds the ":mime" and ":anychild" tagged arguments to the
"header", "address" and "exists" tests. Adds the :type, :subtype,
:contenttype and :param options when ":mime" is used with the
"header" test.
RFC number: RFC XXXX
Contact address: The Sieve discussion list
<address@hidden>.
12.3. replace capability
To: address@hidden
Subject: Registration of new Sieve extension
Capability name: replace
Description: adds the "replace" action for replacing a MIME body part
of a message.
RFC number: RFC XXXX
Contact address: The Sieve discussion list
<address@hidden>.
12.4. enclose capability
To: address@hidden
Subject: Registration of new Sieve extension
Capability name: enclose
Description: adds the "enclose" action for enclosing a message with a
wrapper.
RFC number: RFC XXXX
Contact address: The Sieve discussion list
<address@hidden>.
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12.5. extracttext capability
To: address@hidden
Subject: Registration of new Sieve extension
Capability name: extracttext
Description: adds the "extracttext" action for extracting text from a
MIME body part.
RFC number: RFC XXXX
Contact address: The Sieve discussion list
<address@hidden>.
13. Change History
[[ RFC Editor NOTE: This section is to be removed prior to
publication as an RFC. ]]
13.1. draft-ietf-sieve-mime-09
Allow for 2231 processing.
Optional 2047 decoding.
Explain what test options do against a Content-Disposition header.
Explain interaction with :count.
Updated to SIEVE body reference.
Updated IANA section for :mime to also indicate the four options are
added.
Added comments on the interaction of editheader and replace action.
Made variables normative as extracttext requires it.
Fixed some examples.
13.2. draft-ietf-sieve-mime-08
enhance description of enclose and multiple enclose.
Minor nits
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13.3. draft-ietf-sieve-mime-07
List :anychild parameter next to :mime, where it was added.
Expand description of "address" and "exists".
In replace, discuss interaction of :mime with :subject/:from.
In enclose, expand discussion o fmultiple enclosures.
Mention compilation error if extracttext is used outside of a
foreverypart loop.
13.4. draft-ietf-sieve-mime-06
Added note to foreverypart about nested identical names hiding outer
names.
Added notes to Security Considerations section about it not working
on multipart/signed sections, and how replace/enclose may affect
signatures.
13.5. draft-ietf-sieve-mime-05
Changed for_every_part to foreverypart, and extract_text to
extracttext.
Add option :name parameter to foreverypart and break. break :name
"string" will break out of closest enclosing foreverypart loop
with that name.
Clarify nesting a bit more.
Minor consistency nit picking.
13.6. draft-ietf-sieve-mime-04
loops are depth first
:anychild clarifications
update examples
grammar nits
transcoding for extract_text
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13.7. draft-ietf-sieve-mime-03
add extraction
add security considerations
fill in iana considerations
13.8. draft-ietf-sieve-mime-02
minor syntax glitches in examples
Add clarification on "replace" affecting subsequent for_every_part
loops?
Add IANA considerations for Original-Subject: and Original-From:.
Add note on "enclose" creating From: and Date: headers.
13.9. draft-ietf-sieve-mime-01
what happens when nested for_every_part loop's
a "mime" shorthand for testing the type/subtype, without requiring
interactions with variables
notifications
notifications to calendar service
address tests, exists tests
mimeheader, mimeparameter tests
13.10. draft-ietf-sieve-mime-00
Changed title and text to emphasize MIME Tests.
Changed for.every.part to for_every_part.
Added :anychild to mime test. Default is to use the current
context or outer envelope; specifying :anychild will look at all
children.
Added clarifications to replacing parts affecting the structure.
Added :mime option to replace, ala draft-ietf-sieve-vacation-06.
Various other minor nit fixes.
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13.11. draft-sieve-mime-loop-04
update reference for recent published rfcs
extract-text now required to do decode transfer encoding and
transcode to UTF-8
removed editheader reference since its not actually used
several text changes as suggested by Nigel Swinson, including re-
writes to abstract and introduction
13.12. draft-hansen-sieve-loop-03
after enclosure, subsequent actions affect newly created message
synthesis of Date/From headers by the enclose action is no longer
controversial
Filled in Security Considerations
Picked up extract_text action from draft-ietf-sieve-notify
Expanded the IANA considerations section
13.13. draft-hansen-sieve-loop-02
Update to 3028bis reference.
Added 2119 conventions section.
Terminology/title tweaks.
Added informative references to body and editheader extensions.
Added description of nested loops.
Replaced mime test by extensions to header, address and exists
tests.
13.14. draft-hansen-sieve-loop-01
Merged with draft-daboo-sieve-mime-00.txt.
14. References
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14.1. Normative References
[RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part One: Format of Internet Message
Bodies", RFC 2045, November 1996.
[RFC2047] Moore, K., "MIME (Multipurpose Internet Mail Extensions)
Part Three: Message Header Extensions for Non-ASCII Text",
RFC 2047, November 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2231] Freed, N. and K. Moore, "MIME Parameter Value and Encoded
Word Extensions:
Character Sets, Languages, and Continuations", RFC 2231,
November 1997.
[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO
10646", STD 63, RFC 3629, November 2003.
[RFC5173] Degener, J. and P. Guenther, "Sieve Email Filtering: Body
Extension", RFC 5173, April 2008.
[RFC5228] Guenther, P. and T. Showalter, "Sieve: An Email Filtering
Language", RFC 5228, January 2008.
[RFC5229] Homme, K., "Sieve Email Filtering: Variables Extension",
RFC 5229, January 2008.
[RFC5231] Segmuller, W. and B. Leiba, "Sieve Email Filtering:
Relational Extension", RFC 5231, January 2008.
[RFC5293] Degener, J. and P. Guenther, "Sieve Email Filtering:
Editheader Extension", RFC 5293, August 2008.
[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,
October 2008.
14.2. Informative References
[RFC1991] Atkins, D., Stallings, W., and P. Zimmermann, "PGP Message
Exchange Formats", RFC 1991, August 1996.
[RFC3851] Ramsdell, B., "Secure/Multipurpose Internet Mail
Extensions (S/MIME) Version 3.1 Message Specification",
RFC 3851, July 2004.
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[RFC4871] Allman, E., Callas, J., Delany, M., Libbey, M., Fenton,
J., and M. Thomas, "DomainKeys Identified Mail (DKIM)
Signatures", RFC 4871, May 2007.
[RFC4880] Callas, J., Donnerhacke, L., Finney, H., Shaw, D., and R.
Thayer, "OpenPGP Message Format", RFC 4880, November 2007.
Authors' Addresses
Tony Hansen
AT&T Laboratories
200 Laurel Ave.
Middletown, NJ 07748
USA
Email: address@hidden
Cyrus Daboo
Apple Inc.
1 Infinite Loop
Cupertino, CA 95014
USA
Email: address@hidden
URI: http://www.apple.com/
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============================================================
- [bug-mailutils] sieve and mime,
Alfred M. Szmidt <=