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# Copyright (C) 1998-2015 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
"""Cleanse certain headers from all messages."""
import re
from email.Utils import formataddr, getaddresses, parseaddr
from Mailman import mm_cfg
from Mailman.Utils import unique_message_id
from Mailman.Logging.Syslog import syslog
from Mailman.Handlers.CookHeaders import uheader
cres = []
for regexp in mm_cfg.ANONYMOUS_LIST_KEEP_HEADERS:
try:
if regexp.endswith(':'):
regexp = regexp[:-1] + '$'
cres.append(re.compile(regexp, re.IGNORECASE))
except re.error, e:
syslog('error',
'ANONYMOUS_LIST_KEEP_HEADERS: ignored bad regexp %s: %s',
regexp, e)
def remove_nonkeepers(msg):
for hdr in msg.keys():
keep = False
for cre in cres:
if cre.search(hdr):
keep = True
break
if not keep:
del msg[hdr]
def process(mlist, msg, msgdata):
# Always remove this header from any outgoing messages. Be sure to do
# this after the information on the header is actually used, but before a
# permanent record of the header is saved.
del msg['approved']
# Remove this one too.
del msg['approve']
# And these too.
del msg['x-approved']
del msg['x-approve']
# Also remove this header since it can contain a password
del msg['urgent']
# We remove other headers from anonymous lists
if mlist.anonymous_list:
syslog('post', 'post to %s from %s anonymized',
mlist.internal_name(), msg.get('from'))
del msg['from']
del msg['reply-to']
del msg['sender']
del msg['organization']
del msg['return-path']
# Hotmail sets this one
del msg['x-originating-email']
# And these can reveal the sender too
del msg['received']
# And so can the message-id so replace it.
del msg['message-id']
msg['Message-ID'] = unique_message_id(mlist)
# And something sets this
del msg['x-envelope-from']
# And now remove all but the keepers.
remove_nonkeepers(msg)
i18ndesc = str(uheader(mlist, mlist.description, 'From'))
msg['From'] = formataddr((i18ndesc, mlist.GetListEmail()))
msg['Reply-To'] = mlist.GetListEmail()
uf = msg.get_unixfrom()
if uf:
uf = re.sub(r'\S*@\S*', mlist.GetListEmail(), uf)
msg.set_unixfrom(uf)
# Some headers can be used to fish for membership
del msg['return-receipt-to']
del msg['disposition-notification-to']
del msg['x-confirm-reading-to']
# Pegasus mail uses this one... sigh
del msg['x-pmrqc']
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