------------------------------------------------------------ revno: 1664 fixes bug: https://launchpad.net/bugs/558155 committer: Mark Sapiro <m...@msapiro.net> branch nick: 2.1 timestamp: Thu 2016-07-14 19:10:24 -0700 message: Match header_filter_rules as normalized unicodes. modified: Mailman/Defaults.py.in Mailman/Gui/Privacy.py Mailman/Handlers/SpamDetect.py Mailman/Utils.py Mailman/htmlformat.py NEWS
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=== modified file 'Mailman/Defaults.py.in' --- Mailman/Defaults.py.in 2016-05-27 04:24:56 +0000 +++ Mailman/Defaults.py.in 2016-07-15 02:10:24 +0000 @@ -218,6 +218,13 @@ # -owners address, unless the message is explicitly approved. KNOWN_SPAMMERS = [] +# The header_filter_rules in Privacy options... -> Spam filters are matched as +# normalized unicodes against normalized unicode headers. This setting +# determines the normalization form. It is one of 'NFC', 'NFD', 'NFKC' or +# 'NFKD'. See +# https://docs.python.org/2/library/unicodedata.html#unicodedata.normalize +NORMALIZE_FORM = 'NFKC' + ##### === modified file 'Mailman/Gui/Privacy.py' --- Mailman/Gui/Privacy.py 2016-02-02 20:17:20 +0000 +++ Mailman/Gui/Privacy.py 2016-07-15 02:10:24 +0000 @@ -17,6 +17,7 @@ """MailList mixin class managing the privacy options.""" +import os import re from Mailman import mm_cfg @@ -658,9 +659,20 @@ doc.addError(_("""Header filter rules require a pattern. Incomplete filter rules will be ignored.""")) continue - # Make sure the pattern was a legal regular expression + # Make sure the pattern was a legal regular expression. + # Convert it to unicode if necessary. + mo = re.match('.*charset=([-_a-z0-9]+)', + os.environ.get('CONTENT_TYPE', ''), + re.IGNORECASE + ) + if mo: + cset = mo.group(1) + else: + cset = Utils.GetCharSet(mlist.preferred_language) try: - re.compile(pattern) + upattern = Utils.xml_to_unicode(pattern, cset) + re.compile(upattern) + pattern = upattern except (re.error, TypeError): safepattern = Utils.websafe(pattern) doc.addError(_("""The header filter rule pattern === modified file 'Mailman/Handlers/SpamDetect.py' --- Mailman/Handlers/SpamDetect.py 2016-07-12 18:29:42 +0000 +++ Mailman/Handlers/SpamDetect.py 2016-07-15 02:10:24 +0000 @@ -27,6 +27,7 @@ import re +from unicodedata import normalize from email.Errors import HeaderParseError from email.Header import decode_header from email.Utils import parseaddr @@ -36,6 +37,7 @@ from Mailman import i18n from Mailman import Utils from Mailman.Handlers.Hold import hold_for_approval +from Mailman.Logging.Syslog import syslog try: True, False @@ -63,11 +65,11 @@ def getDecodedHeaders(msg, cset='utf-8'): - """Returns a string containing all the headers of msg, unfolded and - RFC 2047 decoded and encoded in cset. + """Returns a unicode containing all the headers of msg, unfolded and + RFC 2047 decoded, normalized and separated by new lines. """ - headers = '' + headers = u'' for h, v in msg.items(): uvalue = u'' try: @@ -86,7 +88,8 @@ # unicode it as iso-8859-1 which may result in a garbled # mess, but we have to do something. uvalue += unicode(frag, 'iso-8859-1', 'replace') - headers += '%s: %s\n' % (h, uvalue.encode(cset, 'xmlcharrefreplace')) + uhdr = h.decode('us-ascii', 'replace') + headers += u'%s: %s\n' % (h, normalize(mm_cfg.NORMALIZE_FORM, uvalue)) return headers @@ -150,7 +153,7 @@ # Now do header_filter_rules # TK: Collect headers in sub-parts because attachment filename # extension may be a clue to possible virus/spam. - headers = '' + headers = u'' # Get the character set of the lists preferred language for headers lcset = Utils.GetCharSet(mlist.preferred_language) for p in msg.walk(): @@ -164,7 +167,17 @@ # ignore 'empty' patterns if not pattern.strip(): continue - if re.search(pattern, headers, re.IGNORECASE|re.MULTILINE): + pattern = Utils.xml_to_unicode(pattern, lcset) + pattern = normalize(mm_cfg.NORMALIZE_FORM, pattern) + try: + mo = re.search(pattern, + headers, + re.IGNORECASE|re.MULTILINE|re.UNICODE) + except (re.error, TypeError): + syslog('error', + 'ignoring header_filter_rules invalid pattern: %s', + pattern) + if mo: if action == mm_cfg.DISCARD: raise Errors.DiscardMessage if action == mm_cfg.REJECT: === modified file 'Mailman/Utils.py' --- Mailman/Utils.py 2016-05-12 18:54:42 +0000 +++ Mailman/Utils.py 2016-07-15 02:10:24 +0000 @@ -1432,3 +1432,34 @@ return [local + '@' + x for x in domains if x != domain] return [] + +def _invert_xml(mo): + # This is used with re.sub below to convert XML char refs and textual \u + # escapes to unicodes. + try: + if mo.group(1)[:1] == '#': + return unichr(int(mo.group(1)[1:])) + elif mo.group(1)[:1].lower() == 'u': + return unichr(int(mo.group(1)[1:], 16)) + else: + return(u'\ufffd') + except ValueError: + # Value is out of range. Return the unicode replace character. + return(u'\ufffd') + + +def xml_to_unicode(s, cset): + """This converts a string s, encoded in cset to a unicode with translation + of XML character references and textual \uxxxx escapes. It is more or less + the inverse of unicode.decode(cset, errors='xmlcharrefreplace'). It is + similar to canonstr above except for replacing invalid refs with the + unicode replace character and recognizing \u escapes. + """ + if isinstance(s, str): + us = s.decode(cset, 'replace') + us = re.sub(u'&(#[0-9]+);', _invert_xml, us) + us = re.sub(u'(?i)\\\\(u[a-f0-9]{4})', _invert_xml, us) + return us + else: + return s + === modified file 'Mailman/htmlformat.py' --- Mailman/htmlformat.py 2015-01-11 05:22:36 +0000 +++ Mailman/htmlformat.py 2016-07-15 02:10:24 +0000 @@ -1,4 +1,4 @@ -# Copyright (C) 1998-2015 by the Free Software Foundation, Inc. +# Copyright (C) 1998-2016 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 @@ -453,7 +453,7 @@ output.append('>') ret = SPACE.join(output) if self.type == 'TEXT' and isinstance(ret, unicode): - ret = ret.encode(charset, 'replace') + ret = ret.encode(charset, 'xmlcharrefreplace') return ret @@ -504,7 +504,7 @@ output += ' READONLY' output += '>%s</TEXTAREA>' % self.text if isinstance(output, unicode): - output = output.encode(charset, 'replace') + output = output.encode(charset, 'xmlcharrefreplace') return output class FileUpload(InputObj): === modified file 'NEWS' --- NEWS 2016-07-14 21:27:49 +0000 +++ NEWS 2016-07-15 02:10:24 +0000 @@ -9,13 +9,30 @@ New Features - - RFC 2047 encoded headers are now decoded and re-encoded in the charset of - the list's preferred language for matching by header_filter_rules using - errors='xmlcharrefreplace' instead of the former errors='replace'. This - means that characters that can't be represented in the charset of the - list's preferred language will now be represented as '&#nnnn;' XML - character references rather than '?' enabling regexps to be constructed - to match specific characters or ranges. (LP: #558155) + - For header_filter_rules matching, both RFC 2047 encoded headers and + header_filter_rules patterns are now decoded to unicode as are. Both + XML character references of the form &#nnnn; and unicode escapes of the + form \Uxxxx in patterns are converted to unicodes as well. Both headers + and patterns are normalized to 'NFKC' normal form before matching, but + the normalization form can be set via a new NORMALIZE_FORM mm_cfg + setting. Also, the web UI has been updated to encode characters in text + fields that are invalid in the character set of the page's language as + XML character references instead of '?'. This should help with entering + header_filter_rules patterns to match 'odd' characters. This feature is + experimental and is problematic for some cases where it is desired to + have a header_filter_rules pattern with characters not in the character + set of the list's preferred language. For patterns without such + characters, the only change in behavior should be because of unicode + normalization which should improve matching. For other situations such + as trying to match a Subject: with CJK characters (range U+4E00..U+9FFF) + on an English language (ascii) list, one can enter a pattern like + '^subject:.*[一-鿿]' or '^subject:.*[\u4e00;-\u9fff;]' to + match a Subject with any character in the range, and it will work, but + depending on the actual characters and the browser, submitting another, + even unrelated change can garble the original entry although this + usually occurs only with ascii pages and characters in the range + \u0080-\u00ff. The \Uxxxx unicode escapes must have exactly 4 hex + digits, but they are case insensitive. (LP: #558155) - Thanks to Jim Popovitch REMOVE_DKIM_HEADERS can now be set to 3 to preserve the original headers as X-Mailman-Original-... before removing
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