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# @(#) pm-jamime.rc -- subroutine to read mime boundary etc. variables
# @(#) $Id: pm-jamime.rc,v 2.1 2002/01/01 23:34:26 jaalto Exp $
#
# File id
#
# .Copyright (C) 1997-2002 Jari Aalto
# .$Maintainer: Jari Aalto <jari.aalto@poboxes.com> $
# .$Created: 1997-12 $
# .$Keywords: procmail, subroutine, mime $
#
# This code is free software in terms of GNU Gen. pub. Lic. v2 or later
# Refer to http://www.gnu.org/copyleft/gpl.html
#
# Documentation
#
# This includerc reads MIME boundary string from the message
# if it exists. The boudary string is typically found from
# Content-Type header.
#
# Mime-Version: 1.0
# Content-Type: multipart/mixed; boundary=9i9nmIyA2yEADZbW
#
# In addition it will define few other mime variables. See the
# returned values. You use these variables later in your MIME
# message processing.
#
# Mime Notes
#
# 1998-07-28 Brett Glass <brett@lariat.org> reported in PM-L that
# there was security exploit in long attachement filenames:
# http://www.xray.mpe.mpg.de/mailing-lists/procmail/1998-07/msg00248.html
#
# And here is the url to the matter:
#
# http://www.sjmercury.com/business/microsoft/docs/security0728.htm
#
#
# When you use this module to detect mime messages, you can check the
# filename length with recipe:
#
# # Recipe after calling $RC_MIME, this module,
#
# re = ".........." # regexp with 10 matches
# too_long = "$re$re$re$re" # allow 40 characters maximum
#
# :0
# *$ $SUPREME^0 MIME_H_ATTACHEMENT ?? $re
# *$ $SUPREME^0 MIME_B_ATTACHEMENT ?? $re
# {
# dummy = "** Dangerously long mime attachement filename"
# dummy = "** $MIME_H_ATTACHEMENT $MIME_B_ATTACHEMENT"
#
# :0 :
# /var/spool/mail/MimeDanger
# }
#
# Required settings
#
# PMSRC must point to source directory of procmail code. This subroutine
# will include
#
# o pm-javar.rc
#
# Call arguments (variables to set before calling)
#
# (none)
#
# Return values
#
# o Variable MIME is set to "yes" or "no" if messages has mime version
# string
# o MIME_VER contains the mime version string from the header.
# o MIME_TYPE contains the Content-Type from the header.
# o MIME_CTE contains Content-Transfer-Encoding from the header.
# o MIME_H_QP is "yes" if Content-Transfer-Encoding: quoted-printable
# is in the header.
# o MIME_B_QP is "yes" if Content-Transfer-Encoding: quoted-printable
# is found from the body.
# o MIME_BOUNDARY contains the boundary string, which is used to
# differentiate mime sections in the body.
# o MIME_BOUNDARY_COUNT is the number of boundary strings found
# from the body. The value is 3 if there is two mime sections,
# and 4 if 3 etc. MIME_BOUNDARY_COUNT -1 = count of sections.
# o MIME_H_ATTACHEMENT, contains the filename if there was attachement
# filename in the header. Content-Disposition: attachment;
# filename="..."
# o MIME_B_ATTACHEMENT. `body' file attachement. Note however that
# this is the match of first string in the body. There may be
# several attachements. MIME_B_ATTACHEMENT_FILE_COUNT tells you
# how many filenames are in the body.
#
# Usage example
#
# INCLUDERC = $PMSRC/pm-jamime-tag.rc
#
# Change Log (none)
# ............................................................ &code ...
id = "pm-jamime.rc"
dummy = "
========================================================================
$id: init:
"
:0
* ! WSPC ?? ( )
{
INCLUDERC = $PMSRC/pm-javar.rc
}
# ..................................................... &output-vars ...
# output variables
MIME = "no" # set default value
MIME_H_QP = "no"
MIME_B_QP = "no"
MIME_VER
MIME_CTE
MIME_TYPE
MIME_BOUNDARY
MIME_BOUNDARY_COUNT
# ........................................................... &do-it ...
# The WSPC ?? ( ) is there just double checking that we REALLY read
# the pm-javar.rc. We must not set any MIME variables if that wasn't
# read.
:0
* ^Mime-Version: *\/[0-9.]+
* WSPC ?? ( )
{
MIME = "yes"
MIME_VER = $MATCH
:0
* ^Content-Type: +\/.*
{
MIME_TYPE = $MATCH
}
:0
*$ ^Content-Transfer-Encoding:$s+\/.*
{
MIME_CTE = $MATCH
:0
* MIME_CTE ?? quoted-printable
{
MIME_H_QP = "yes"
}
}
:0
*$ B ?? ^Content-Transfer-Encoding:$s+quoted-printable
{
MIME_B_QP = "yes"
}
# What is the MIME tag in this message?
#
# Content-Type: multipart/mixed;
# boundary="---- =_NextPart_000_01BD04D4.A5AC6B00"
#
# Note that in the text, this string may not be excatly like this,
# Eg. in my messages there was "--" prepended to the tag.
#
:0
* boundary *= *\"\/[^\";]+
{
MIME_BOUNDARY = $MATCH
}
# Hm, the boundary string was not surrounded by double quotes.
# Search this kind of boundary string then:
#
# Content-Type: multipart/mixed; boundary=9i9nmIyA2yEADZbW
:0 E
* boundary *= *\/[^\";]+
{
# " Don't mind this, a dummy double quote to help Emacs
# to end starting quote below. Otherwise syntax colour
# highlighting would go beserk.
MIME_BOUNDARY = $MATCH
}
dummy = "$id: Do we have the boundary string?"
:0
*! MIME_BOUNDARY ?? ^^^^
{
# Count how many mime sections there are in the message.
# MIME_BOUNDARY_COUNT -1 = count of mime sections.
:0
*$ B ?? 1^1 $\MIME_BOUNDARY
{ }
MIME_BOUNDARY_COUNT = $=
}
# Mime-Version: 1.0 (generated by tm-edit 7.106)
# Content-Type: application/octet-stream
# Content-Disposition: attachment; filename="file.txt"
# Content-Transfer-Encoding: 7bit
#
# Note: the second regexp assumes "filename=file.txt"
mimeAttachementRegexp1 = "filename$s*=$s*[\"']\/[^\"\']+"
mimeAttachementRegexp2 = "filename$s*=$s*\/.*"
:0
*$ H ?? ^Content-Disposition:.*attachment$s*;$s*\/.*
*$ $SUPREME^0 MATCH ?? $mimeAttachementRegexp1
*$ $SUPREME^0 MATCH ?? $mimeAttachementRegexp2
{
MIME_H_ATTACHEMENT = $MATCH
}
:0 E
*$ B ?? ^Content-Disposition:.*attachment$s*;$s*\/.*
*$ $SUPREME^0 MATCH ?? $mimeAttachementRegexp1
*$ $SUPREME^0 MATCH ?? $mimeAttachementRegexp2
{
MIME_B_ATTACHEMENT = $MATCH
:0
*$ B ?? 1^1 ^Content-Disposition:.*attachment.*filename
{ }
MIME_B_ATTACHEMENT_FILE_COUNT = $=
}
}
dummy = "$id: end:"
# pm-jamime-tag.rc ends here
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