This commit was manufactured by cvs2svn to create tag 'milter-0_8_1'.

Sprout from bmsi 2005-05-31 18:23:49 UTC Stuart Gathman <stuart@gathman.org> 'Development changes since 0.7.2'
Cherrypick from master 2005-06-17 02:23:34 UTC Stuart Gathman <stuart@gathman.org> 'Release 0.8.1':
    COPYING
    MANIFEST.in
    Milter/__init__.py
    Milter/dsn.py
    Milter/dynip.py
    NEWS
    TODO
    bms.py
    faq.html
    milter.cfg
    milter.html
    milter.spec
    miltermodule.c
    mime.py
    setup.cfg
    setup.py
    softfail.txt
    spf.py
    spfquery.py
    strike3.txt
    test/zip1
    test/ziploop
    testmime.py

COPYING

@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
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+These restrictions translate to certain responsibilities for you if you
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+
+  For example, if you distribute copies of such a program, whether
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+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
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+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
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+  The precise terms and conditions for copying, distribution and
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+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+You may charge a fee for the physical act of transferring a copy, and
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+
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+
+These requirements apply to the modified work as a whole.  If
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+
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+
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+license would not permit royalty-free redistribution of the Program by
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+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
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+
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+to distribute software through any other system and a licensee cannot
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
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+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
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+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

MANIFEST.in

@@ -15,8 +15,12 @@ include spfquery.py
 include test.py
 include sample.py
 include test/*
+include Milter/*.py
 include *.spec
 include start.sh
 include milter.rc
 include milter.rc7
 include milter.cfg
+include rhsbl.m4
+include softfail.txt
+include strike3.txt

Milter.py

@@ -8,15 +8,12 @@ import milter
 import thread
 
 from milter import ACCEPT,CONTINUE,REJECT,DISCARD,TEMPFAIL,	\
-  set_flags, setdbg, \
+  set_flags, setdbg, setbacklog, settimeout, \
   ADDHDRS, CHGBODY, ADDRCPT, DELRCPT, CHGHDRS,	\
   V1_ACTS, V2_ACTS, CURR_ACTS
 
-try:
-  from milter import QUARANTINE
-except:
-  #print 'No QUARANTINE support'
-  pass
+try: from milter import QUARANTINE
+except: pass
 
 _seq_lock = thread.allocate_lock()
 _seq = 0
@@ -100,8 +97,10 @@ class Milter:
   def getsymval(self,sym):
     return self.__ctx.getsymval(sym)
 
-  def setreply(self,rcode,xcode,msg):
-    return self.__ctx.setreply(rcode,xcode,msg)
+  # If sendmail does not support setmlreply, then only the
+  # first msg line is used.
+  def setreply(self,rcode,xcode=None,msg=None,*ml):
+    return self.__ctx.setreply(rcode,xcode,msg,*ml)
 
   # Milter methods which can only be called from eom callback.
   def addheader(self,field,value):
@@ -119,6 +118,8 @@ class Milter:
   def replacebody(self,body):
     return self.__ctx.replacebody(body)
 
+  # When quarantined, a message goes into the mailq as if to be delivered,
+  # but delivery is deferred until the message is unquarantined.
   def quarantine(self,reason):
     return self.__ctx.quarantine(reason)
 

Milter/__init__.py

@@ -0,0 +1,220 @@
+# Author: Stuart D. Gathman <stuart@bmsi.com>
+# Copyright 2001 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
+
+# A thin OO wrapper for the milter module
+
+import os
+import milter
+import thread
+
+from milter import ACCEPT,CONTINUE,REJECT,DISCARD,TEMPFAIL,	\
+  set_flags, setdbg, setbacklog, settimeout, \
+  ADDHDRS, CHGBODY, ADDRCPT, DELRCPT, CHGHDRS,	\
+  V1_ACTS, V2_ACTS, CURR_ACTS
+
+try: from milter import QUARANTINE
+except: pass
+
+_seq_lock = thread.allocate_lock()
+_seq = 0
+
+def uniqueID():
+  """Return a sequence number unique to this process.
+  """
+  global _seq
+  _seq_lock.acquire()
+  seqno = _seq = _seq + 1
+  _seq_lock.release()
+  return seqno
+  
+class Milter:
+  """A simple class interface to the milter module.
+  """
+  def _setctx(self,ctx):
+    self.__ctx = ctx
+    if ctx:
+      ctx.setpriv(self)
+
+  # user replaceable callbacks
+  def log(self,*msg):
+    print 'Milter:',
+    for i in msg: print i,
+    print
+
+  def connect(self,hostname,unused,hostaddr):
+    "Called for each connection to sendmail."
+    self.log("connect from %s at %s" % (hostname,hostaddr))
+    return CONTINUE
+
+  def hello(self,hostname):
+    "Called after the HELO command."
+    self.log("hello from %s" % hostname)
+    return CONTINUE
+
+  def envfrom(self,f,*str):
+    """Called to begin each message.
+    f -> string		message sender
+    str -> tuple	additional ESMTP parameters
+    """
+    self.log("mail from",f,str)
+    return CONTINUE
+
+  def envrcpt(self,to,*str):
+    "Called for each message recipient."
+    self.log("rcpt to",to,str)
+    return CONTINUE
+
+  def header(self,field,value):
+    "Called for each message header."
+    self.log("%s: %s" % (field,value))
+    return CONTINUE
+
+  def eoh(self):
+    "Called after all headers are processed."
+    self.log("eoh")
+    return CONTINUE
+
+  def body(self,unused):
+    "Called to transfer the message body."
+    return CONTINUE
+
+  def eom(self):
+    "Called at the end of message."
+    self.log("eom")
+    return CONTINUE
+
+  def abort(self):
+    "Called if the connection is terminated abnormally."
+    self.log("abort")
+    return CONTINUE
+
+  def close(self):
+    "Called at the end of connection, even if aborted."
+    self.log("close")
+    return CONTINUE
+
+  # Milter methods which can be invoked from callbacks
+  def getsymval(self,sym):
+    return self.__ctx.getsymval(sym)
+
+  # If sendmail does not support setmlreply, then only the
+  # first msg line is used.
+  def setreply(self,rcode,xcode=None,msg=None,*ml):
+    return self.__ctx.setreply(rcode,xcode,msg,*ml)
+
+  # Milter methods which can only be called from eom callback.
+  def addheader(self,field,value):
+    return self.__ctx.addheader(field,value)
+
+  def chgheader(self,field,idx,value):
+    return self.__ctx.chgheader(field,idx,value)
+
+  def addrcpt(self,rcpt):
+    return self.__ctx.addrcpt(rcpt)
+
+  def delrcpt(self,rcpt):
+    return self.__ctx.delrcpt(rcpt)
+
+  def replacebody(self,body):
+    return self.__ctx.replacebody(body)
+
+  # When quarantined, a message goes into the mailq as if to be delivered,
+  # but delivery is deferred until the message is unquarantined.
+  def quarantine(self,reason):
+    return self.__ctx.quarantine(reason)
+
+  def progress(self):
+    return self.__ctx.progress()
+
+factory = Milter
+
+def connectcallback(ctx,hostname,family,hostaddr):
+  m = factory()
+  m._setctx(ctx)
+  return m.connect(hostname,family,hostaddr)
+
+def closecallback(ctx):
+  m = ctx.getpriv()
+  if not m: return CONTINUE
+  rc = m.close()
+  m._setctx(None)	# release milterContext
+  return rc
+
+def dictfromlist(args):
+  "Convert ESMTP parm list to keyword dictionary."
+  kw = {}
+  for s in args:
+    pos = s.find('=')
+    if pos > 0:
+      kw[s[:pos].upper()] = s[pos+1:]
+  return kw
+
+def envcallback(c,args):
+  """Call function c with ESMTP parms converted to keyword parameters.
+  Can be used in the envfrom and/or envrcpt callbacks to process
+  ESMTP parameters as python keyword parameters."""
+  kw = {}
+  pargs = [args[0]]
+  for s in args[1:]:
+    pos = s.find('=')
+    if pos > 0:
+      kw[s[:pos].upper()] = s[pos+1:]
+    else:
+      pargs.append(s)
+  return c(*pargs,**kw)
+
+def runmilter(name,socketname,timeout = 0):
+  # This bit is here on the assumption that you will be starting this filter
+  # before sendmail.  If sendmail is not running and the socket already exists,
+  # libmilter will throw a warning.  If sendmail is running, this is still
+  # safe if there are no messages currently being processed.  It's safer to
+  # shutdown sendmail, kill the filter process, restart the filter, and then
+  # restart sendmail.
+  pos = socketname.find(':')
+  if pos > 1:
+    s = socketname[:pos]
+    fname = socketname[pos+1:]
+  else:
+    s = "unix"
+    fname = socketname
+  if s == "unix" or s == "local":
+    print "Removing %s" % fname
+    try:
+      os.unlink(fname)
+    except:
+      pass
+
+  # The default flags set include everything
+  # milter.set_flags(milter.ADDHDRS)
+  milter.set_connect_callback(connectcallback)
+  milter.set_helo_callback(lambda ctx, host: ctx.getpriv().hello(host))
+  # For envfrom and envrcpt, we would like to convert ESMTP parms to keyword
+  # parms, but then all existing users would have to include **kw to accept
+  # arbitrary keywords without crashing.  We do provide envcallback and
+  # dictfromlist to make parsing the ESMTP args convenient.
+  milter.set_envfrom_callback(lambda ctx,*str: ctx.getpriv().envfrom(*str))
+  milter.set_envrcpt_callback(lambda ctx,*str: ctx.getpriv().envrcpt(*str))
+  milter.set_header_callback(lambda ctx,fld,val: ctx.getpriv().header(fld,val))
+  milter.set_eoh_callback(lambda ctx: ctx.getpriv().eoh())
+  milter.set_body_callback(lambda ctx,chunk: ctx.getpriv().body(chunk))
+  milter.set_eom_callback(lambda ctx: ctx.getpriv().eom())
+  milter.set_abort_callback(lambda ctx: ctx.getpriv().abort())
+  milter.set_close_callback(closecallback)
+
+  milter.setconn(socketname)
+  if timeout > 0: milter.settimeout(timeout)
+  # The name *must* match the X line in sendmail.cf (supposedly)
+  milter.register(name)
+  start_seq = _seq
+  try:
+    milter.main()
+  except milter.error:
+    if start_seq == _seq: raise	# couldn't start
+    # milter has been running for a while, but now it can't start new threads
+    raise milter.error("out of thread resources")
+
+__all__ = globals().copy()
+for priv in ('os','milter','thread','factory','_seq','_seq_lock'):
+  del __all__[priv]
+__all__ = __all__.keys()

Milter/dsn.py

@@ -0,0 +1,188 @@
+# Author: Stuart D. Gathman <stuart@bmsi.com>
+# Copyright 2005 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
+
+# Send DSNs, do call back verification,
+# and generate DSN messages from a template
+
+import smtplib
+import spf
+import socket
+from email.Message import Message
+
+nospf_msg = """Subject: Critical mail server configuration error
+
+This is an automatically generated Delivery Status Notification.
+
+THIS IS A WARNING MESSAGE ONLY.
+
+YOU DO *NOT* NEED TO RESEND YOUR MESSAGE.
+
+Delivery to the following recipients has been delayed.
+
+	%(rcpt)s
+
+Subject: %(subject)s 
+
+Someone at IP address %(connectip)s sent an email claiming
+to be from %(sender)s.  
+
+If that wasn't you, then your domain, %(sender_domain)s,
+was forged - i.e. used without your knowlege or authorization by
+someone attempting to steal your mail identity.  This is a very
+serious problem, and you need to provide authentication for your
+SMTP (email) servers to prevent criminals from forging your
+domain.  The simplest step is usually to publish an SPF record
+with your Sender Policy.  
+
+For more information, see: http://spfhelp.net
+
+I hate to annoy you with a DSN (Delivery Status
+Notification) from a possibly forged email, but since you
+have not published a sender policy, there is no other way
+of bringing this to your attention.
+
+If it *was* you that sent the email, then your email domain
+or configuration is in error.  If you don't know anything
+about mail servers, then pass this on to your SMTP (mail)
+server administrator.  We have accepted the email anyway, in
+case it is important, but we couldn't find anything about
+the mail submitter at %(connectip)s to distinguish it from a
+zombie (compromised/infected computer - usually a Windows
+PC).  There was no PTR record for its IP address (PTR names
+that contain the IP address don't count).  RFC2821 requires
+that your hello name be a FQN (Fully Qualified domain Name,
+i.e. at least one dot) that resolves to the IP address of
+the mail sender.  In addition, just like for PTR, we don't
+accept a helo name that contains the IP, since this doesn't
+help to identify you.  The hello name you used,
+%(heloname)s, was invalid.
+
+Furthermore, there was no SPF record for the sending domain
+%(sender_domain)s.  We even tried to find its IP in any A or
+MX records for your domain, but that failed also.  We really
+should reject mail from anonymous mail clients, but in case
+it is important, we are accepting it anyway.
+
+We are sending you this message to alert you to the fact that
+
+Either - Someone is forging your domain.
+Or - You have problems with your email configuration.
+Or - Possibly both.
+
+If you need further assistance, please do not hesitate to
+contact me again.
+
+Kind regards,
+
+postmaster@%(receiver)s
+"""
+
+softfail_msg = """Subject: SPF softfail (POSSIBLE FORGERY)
+
+This is an automatically generated Delivery Status Notification.
+
+THIS IS A WARNING MESSAGE ONLY.
+
+YOU DO *NOT* NEED TO RESEND YOUR MESSAGE.
+
+Delivery to the following recipients has been delayed.
+
+       %(rcpt)s
+
+Subject: %(subject)s
+Received-SPF: %(spf_result)s
+"""
+
+def send_dsn(mailfrom,receiver,msg=None):
+  """Send DSN.  If msg is None, do callback verification.
+     Mailfrom is original sender we are sending DSN or CBV to.
+     Receiver is the MTA sending the DSN.
+     Return None for success or (code,msg) for failure."""
+  user,domain = mailfrom.split('@')
+  q = spf.query(None,None,None)
+  mxlist = q.dns(domain,'MX')
+  if not mxlist:
+    mxlist = (0,domain),
+  else:
+    mxlist.sort()
+  smtp = smtplib.SMTP()
+  for prior,host in mxlist:
+    try:
+      smtp.connect(host)
+      code,resp = smtp.helo(receiver)
+      # some wiley spammers have MX records that resolve to 127.0.0.1
+      if resp.split()[0] == receiver:
+        return (553,'Fraudulent MX for %s' % domain)
+      if not (200 <= code <= 299):
+	raise smtplib.SMTPHeloError(code, resp)
+      if msg:
+        try:
+	  smtp.sendmail('<>',mailfrom,msg)
+	except smtplib.SMTPSenderRefused:
+	  # does not accept DSN, try postmaster (at the risk of mail loops)
+	  smtp.sendmail('<postmaster@%s>'%receiver,mailfrom,msg)
+      else:	# CBV
+	code,resp = smtp.docmd('MAIL FROM: <>')
+	if code != 250:
+	  raise smtplib.SMTPSenderRefused(code, resp, '<>')
+	code,resp = smtp.rcpt(mailfrom)
+	if code not in (250,251):
+	  return (code,resp)		# permanent error
+	smtp.quit()
+      return None			# success
+    except smtplib.SMTPRecipientsRefused,x:
+      return x.recipients[mailfrom]	# permanent error
+    except smtplib.SMTPSenderRefused,x:
+      return x.args[:2]			# does not accept DSN
+    except smtplib.SMTPDataError,x:
+      return x.args			# permanent error
+    except smtplib.SMTPException:
+      pass		# any other error, try next MX
+    except socket.error:
+      pass		# MX didn't accept connections, try next one
+    smtp.close()
+  return (450,'No MX servers available')	# temp error
+
+def create_msg(q,rcptlist,origmsg=None,template=None):
+  "Create a DSN message from a template.  Template must be '\n' separated."
+  heloname = q.h
+  sender = q.s
+  connectip = q.i
+  receiver = q.r
+  sender_domain = q.o
+  rcpt = '\n\t'.join(rcptlist)
+  try: subject = origmsg['Subject']
+  except: subject = '(none)'
+  try:
+    spf_result = origmsg['Received-SPF']
+    if not spf_result.startswith('softfail'):
+      spf_result = None
+  except: spf_result = None
+
+  msg = Message()
+
+  msg.add_header('To',sender)
+  msg.add_header('From','postmaster@%s'%receiver)
+  msg.add_header('Auto-Submitted','auto-generated (configuration error)')
+  msg.set_type('text/plain')
+
+  if not template:
+    if spf_result: template = softfail_msg
+    else: template = nospf_msg
+  hdrs,body = template.split('\n',1)
+  for ln in hdrs.splitlines():
+    name,val = ln.split(':',1)
+    msg.add_header(name,(val % locals()).strip())
+  msg.set_payload(body % locals())
+
+  return msg
+
+if __name__ == '__main__':
+  q = spf.query('192.168.9.50',
+  'SRS0=pmeHL=RH=bmsi.com=stuart@bmsi.com',
+  'bmsred.bmsi.com',receiver='mail.bmsi.com')
+  msg = create_msg(q,['charlie@jsconnor.com'],None,None)
+  print msg.as_string()
+  # print send_dsn(f,msg.as_string())
+  print send_dsn(q.s,'mail.bmsi.com',msg.as_string())

Milter/dynip.py

@@ -0,0 +1,93 @@
+# Author: Stuart D. Gathman <stuart@bmsi.com>
+# Copyright 2005 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
+
+# Heuristically determine whether a domain name is for a dynamic IP.
+
+# examples we don't yet recognize:
+#
+# wiley-268-8196.roadrunner.nf.net at ('205.251.174.46', 4810)
+# cbl-sd-02-79.aster.com.do at ('200.88.62.79', 4153)
+
+import re
+
+ip3 = re.compile('[0-9]{1,3}')
+hpats = (
+ 'h[0-9a-f]{12}[.]',
+ 'h\d*n\d*c\d*o\d*\.',
+ 'pcp\d{6,10}pcs[.]',
+ 'no-reverse',
+ 'S[0-9a-f]{16}[.][a-z]{2}[.]',
+ 'user<3>\.',
+ '[Cc]ust<3>\.',
+ '^<3>\.',
+ 'ppp[^.]*<3>\.',
+ '-ppp\d*\.',
+ '\d*-<3>\.',
+ '[0-9a-f]{1,3}-<3>\.',
+ 'p<3>\.pool',
+ 'h<3>\.',
+ 'xdsl-\d*\.',
+ '-\d*-\d*\.',
+ '\.adsl\.',
+ '\.cable\.'
+)
+rehmac = re.compile('|'.join(hpats))
+
+def is_dynip(host,addr):
+  """Return True if hostname is for a dynamic ip.
+  Examples:
+
+  >>> is_dynip('post3.fabulousdealz.com','69.60.99.112')
+  False
+  >>> is_dynip('adsl-69-208-201-177.dsl.emhril.ameritech.net','69.208.201.177')
+  True
+  >>> is_dynip('[1.2.3.4]','1.2.3.4')
+  True
+  """
+  if host.startswith('[') and host.endswith(']'):
+    return True
+  if addr:
+    if host.find(addr) >= 0: return True
+    a = addr.split('.')
+    ia = map(int,a)
+    h = host
+    m = ip3.findall(host)
+    if m:
+      g = map(int,m)
+      ia3 = (ia[1:],ia[:3])
+      if g[-3:] in ia3: return True
+      if g[0] == ia[3] and g[1:3] == ia[:2]: return True
+      if g[-2:] == ia[2:]: return True
+      g.reverse()
+      if g[:3] in ia3: return True
+      if g[:2] == ia[2:]: return True
+      if ia[2:] in (g[:2],g[-2:]): return True
+      for m in ip3.finditer(host):
+        if int(m.group()) == ia[3]:
+	  h = host[:m.start()] + '<3>' + host[m.end():]
+	  break
+    if rehmac.search(h): return True
+    if host.find(''.join(a[:3])) >= 0: return True
+    if host.find(''.join(a[1:])) >= 0: return True
+    x = "%02x%02x%02x%02x" % tuple(ia)
+    if host.lower().find(x) >= 0: return True
+  return False
+
+if __name__ == '__main__':
+  import fileinput
+  import sets
+  seen = sets.Set()
+  for ln in fileinput.input():
+    a = ln.split()
+    if a[3:5] == ['connect','from']:
+      host = a[5]
+      if host.startswith('[') and host.endswith(']'):
+	continue	# no PTR
+      ip = a[7][2:-2]
+      if ip in seen: continue
+      seen.add(ip)
+      if is_dynip(host,ip):
+        print '%s\t%s DYN' % (ip,host)
+      else:
+        print '%s\t%s' % (ip,host)

NEWS

@@ -1,5 +1,29 @@
 Here is a history of user visible changes to Python milter.
 
+0.8.1	Fix zip in zip loop in mime.py
+	Fix HeaderParseError in bms.py header callback
+	Check internal_domains for outgoing mail
+	Fix inconsistent results from send_dsn
+0.8.0	Move Milter module to subpackage.
+	DSN support for Three strikes rule and SPF SOFTFAIL
+	Move /*mime*/ and dynip to Milter subpackage
+	Fix SPF unknown mechanism list not cleared
+	Make banned extensions configurable.
+	Option to scan zipfiles for bad extensions.
+	Properly log pydspam exceptions
+0.7.3	Experimental release with python2.4 support
+0.7.2	Return unknown for invalid ip address in mechanism
+	Recognize dynamic PTR names, and don't count them as authentication.
+	Three strikes and yer out rule.
+	Block softfail by default when no PTR or HELO
+	Return unknown for null mechanism
+	Try best guess on HELO also
+	Expand setreply for common errors
+	make rhsbl.m4 hack available for sendmail.mc
+0.7.1	Handle modifying mislabeled multipart messages without an exception
+	Support setbacklog, setmlreply
+	Allow multi-recipient CBV
+	Return TEMPFAIL for SPF softfail
 0.7.0	SPF check hello name
 	Move pythonsock to /var/run/milter
 	Move milter.cfg to /etc/mail/pymilter.cfg

README

@@ -92,7 +92,6 @@ milter.  This milter's socket is a unix-domain socket in the filesystem.
 See libmilter/README for the definitive list of options.
 NB: The name is specified in two places: here, in sendmail's cf file, and
 in the milter itself.  Make sure the two match.
-NB: OpenBSD must use an inet socket.  See the web page for details.
 NB: The above lines can be added in your .mc file with this line:
 
 INPUT_MAIL_FILTER(`pythonfilter', `S=local:/home/username/pythonsock')
@@ -124,16 +123,6 @@ and headers at
 
 http://www.bmsi.com/linux/sendmail-rh72.spec
 
-OpenBSD Notes
--------------
-
-Sendmail is broken on OpenBSD for unix domain sockets.  You must use an
-inet socket for milter.  The sendmail.cf 'X' config line would look like:
-
-Xpythonfilter,        S=inet:1234@localhost
-
-and the sample milter needs to be modified accordingly.
-
 IPv6 Notes
 ----------
 

TODO

@@ -1,21 +1,36 @@
-Message not saved for following traceback:
-Traceback (most recent call last):
-  File "/usr/lib/python2.3/site-packages/Milter.py", line 188, in <lambda>
-    milter.set_eom_callback(lambda ctx: ctx.getpriv().eom())
-  File "bms.py", line 935, in eom
-    msg.dump(out)
-  File "/usr/lib/python2.3/site-packages/mime.py", line 347, in dump
-    g.flatten(self,unixfrom=unixfrom)
-  File "/var/tmp/python2.3-2.3.3-root/usr/lib/python2.3/email/Generator.py", line 102, in flatten
-  File "/var/tmp/python2.3-2.3.3-root/usr/lib/python2.3/email/Generator.py", line 130, in _write
-  File "/var/tmp/python2.3-2.3.3-root/usr/lib/python2.3/email/Generator.py", line 156, in _dispatch
-  File "/var/tmp/python2.3-2.3.3-root/usr/lib/python2.3/email/Generator.py", line 199, in _handle_text
-TypeError: string payload expected: <type 'list'>
-------------
-spf.py has no recursion bound on CNAME lookup
+Defer TEMPERROR in SPF evaluation - give precedence to security
+(only defer for PASS mechanisms).
+
+Option to add Received-SPF header, but never reject on SPF.
+
+Create null config that does nothing - except maybe add Received-SPF
+headers.  Many admins would like to turn features on one at a time.
+
+Checking in mime.py;
+/bms/cvs/milter/mime.py,v  <--  mime.py
+new revision: 1.56; previous revision: 1.55
+done
+Checking in spf.py;
+/bms/cvs/milter/spf.py,v  <--  spf.py
+new revision: 1.18; previous revision: 1.17
+done
+Checking in testmime.py;
+/bms/cvs/milter/testmime.py,v  <--  testmime.py
+new revision: 1.19; previous revision: 1.18
+
+Auto whitelist based on outgoing email - perhaps with magic subject
+or recipient prefix.
+
+Can't output messages with malformed rfc822 attachments.
+
+Example malformed SPF:
+onvunvuvvx.usafisnews.org text "v=spf1 mx ptr ip4:207.44.199.970 -all"
+
+Move milter,Milter,mime,spf modules to pymilter
+milter package will have bms.py application
+
 Support SMTP AUTH and disable SPF checks when connection is authorized.
 Web admin interface
-RHSBL
 Check valid domains allowed by internal senders to detect PCs infected
 with spam trojans.
 Do CBV (callback verification) for mail with no published SPF record.
@@ -63,3 +78,4 @@ Wrap smfi_setbacklog(int) - but it is only available in sendmail >= 8.12.3,
 Need a test module to feed sample messages to a milter though a live 
 sendmail and SMTP.  The mockup currently used is probably not very accurate,
 and doesn't test the threading code.
+

bms.py

@@ -1,6 +1,96 @@
 #!/usr/bin/env python
-# A simple milter.
+# A simple milter that has grown quite a bit.
 # $Log$
+# Revision 1.10  2005/06/16 18:35:51  customdesigned
+# Ignore HeaderParseError decoding header
+#
+# Revision 1.9  2005/06/14 21:55:29  customdesigned
+# Check internal_domains for outgoing mail.
+#
+# Revision 1.8  2005/06/06 18:24:59  customdesigned
+# Properly log exceptions from pydspam
+#
+# Revision 1.7  2005/06/04 19:41:16  customdesigned
+# Fix bugs from testing RPM
+#
+# Revision 1.6  2005/06/03 04:57:05  customdesigned
+# Organize config reader by section.  Create defang section.
+#
+# Revision 1.5  2005/06/02 15:00:17  customdesigned
+# Configure banned extensions.  Scan zipfile option with test case.
+#
+# Revision 1.4  2005/06/02 04:18:55  customdesigned
+# Update copyright notices after reading article on /.
+#
+# Revision 1.3  2005/06/02 02:09:00  customdesigned
+# Record timestamp in send_dsn.log
+#
+# Revision 1.2  2005/06/02 01:00:36  customdesigned
+# Support configurable templates for DSNs.
+#
+#
+# Revision 1.134  2005/05/25 15:36:43  stuart
+# Use dynip module.
+# Support smart aliasing of wiretap destination.
+# Always send DSN for SOFTFAIL.
+# Close forged bounce loophole when there are no headers.
+#
+# Revision 1.133  2005/03/16 21:58:04  stuart
+# Auto DSN feature.
+#
+# Revision 1.132  2005/02/12 02:11:10  stuart
+# Pass unit tests with python2.4.
+#
+# Revision 1.131  2005/02/11 18:34:13  stuart
+# Handle garbage after quote in boundary.
+#
+# Revision 1.130  2005/02/10 01:10:58  stuart
+# Fixed MimeMessage.ismodified()
+#
+# Revision 1.129  2005/02/10 00:56:48  stuart
+# Runs with python2.4.  Defang not working correctly - more work needed.
+#
+# Revision 1.128  2005/02/09 17:53:34  stuart
+# Optionally run dspam on internal mail.
+#
+# Revision 1.127  2004/12/03 14:26:21  stuart
+# Mark DYN PTR, REJECT softfail, log Received-SPF from trusted MTA.
+#
+# Revision 1.126  2004/11/24 14:39:38  stuart
+# Also accept softfail if valid PTR or HELO.
+#
+# Revision 1.125  2004/11/19 16:40:14  stuart
+# Block softfail except for listed domains.
+#
+# Revision 1.124  2004/11/19 06:18:04  stuart
+# block softfail for configured domains only
+#
+# Revision 1.123  2004/11/18 20:36:49  stuart
+# Recognize more dynamic hosts.  Ignore dynamic PTR for best_guess.
+#
+# Revision 1.122  2004/11/18 17:16:10  stuart
+# Recognize more dynamic ips.
+#
+# Revision 1.121  2004/11/09 22:37:48  stuart
+# Don't accept helo names which are dynamic IP addresses.
+#
+# Revision 1.120  2004/11/09 20:33:50  stuart
+# Recognize more dynamic PTR variations.
+#
+# Revision 1.118  2004/08/30 21:19:50  stuart
+# Try best guess for HELO, expand setreply for common errors
+#
+# Revision 1.117  2004/08/23 02:27:53  stuart
+# Allow multi rcpt CBV.  Add some multiline replies.
+#
+# Revision 1.116  2004/08/20 22:27:52  stuart
+# Generate TEMPFAIL for SPF softfail.
+#
+# Revision 1.115  2004/08/19 20:55:49  stuart
+# Always show reversed SRS path.
+# Check if encodings are an ASCII superset.  Some messages were encoded as
+# BIG5 and getting rejected even though chars were all in ascii subset.
+#
 # Revision 1.114  2004/07/27 00:40:12  stuart
 # Make reject on no PTR optional.
 #
@@ -116,105 +206,9 @@
 # Revision 1.79  2003/12/04 23:46:06  stuart
 # Release 0.6.4
 #
-# Revision 1.78  2003/12/04 23:20:24  stuart
-# Make headerChange handle deleting absent header
-#
-# Revision 1.77  2003/12/04 22:01:40  stuart
-# Limit size of messages which will be dspammed.  This works around a bug
-# in dspam-2.6.5.2 where it scans large binary attachments.  I've never
-# seen really big spam anyway.
-#
-# Revision 1.76  2003/12/04 21:44:33  stuart
-# Pass header changes from Dspam to sendmail
-#
-# Revision 1.75  2003/11/25 17:43:07  stuart
-# Update FAQ.
-#
-# Revision 1.74  2003/11/25 17:36:58  stuart
-# dspam_reject
-#
-# Revision 1.73  2003/11/24 15:46:00  stuart
-# Missing global for dspam_whitelist
-#
-# Revision 1.72  2003/11/22 02:52:07  stuart
-# Handle multiple x-dspam-recipients properly on false positive
-#
-# Revision 1.71  2003/11/22 02:49:57  stuart
-# dspam whitelist
-#
-# Revision 1.70  2003/11/09 03:53:34  stuart
-# Don't block delivery of defanged false positives.
-#
-# Revision 1.69  2003/11/08 22:47:04  stuart
-# Exempt entire domains with '@domain.com'
-#
-# Revision 1.68  2003/11/02 03:06:16  stuart
-# Adjust error codes again.
-#
-# Revision 1.67  2003/11/02 03:01:46  stuart
-# Adjust SMTP error codes after careful reading of standard.
-#
-# Revision 1.66  2003/11/02 01:56:43  stuart
-# Use busy SMTP code.
-#
-# Revision 1.65  2003/11/02 01:44:11  stuart
-# Suppress traceback for Dspam lock timeouts
-#
-# Revision 1.64  2003/10/28 01:00:19  stuart
-# Dspam internal mail for dspam users
-#
-# Revision 1.63  2003/10/25 02:10:34  stuart
-# Match hostname for internal connection test, even if no ipaddr.
-#
-# Revision 1.62  2003/10/24 04:34:52  stuart
-# Fix for not saving defang of false positive triggered rejecting it
-# as a virus from self.
-#
-# Revision 1.61  2003/10/22 22:03:14  stuart
-# Apply dspam_exempt to screening
-#
-# Revision 1.60  2003/10/22 21:58:42  stuart
-# Don't save false positives as defang file.
-#
-# Revision 1.59  2003/10/22 05:02:27  stuart
-# Add support for dspam screeners
-#
-# Revision 1.58  2003/10/16 22:19:24  stuart
-# Redirect Dspam logging to bms milter
-#
-# Revision 1.57  2003/10/10 00:15:04  stuart
-# DISCARD message if quarrantined for any recipient.
-#
-# Revision 1.56  2003/10/06 19:30:27  stuart
-# REJECT messages with boundard errors
-#
-# Revision 1.55  2003/10/03 18:20:31  stuart
-# Opt-out feature to exempt certain recipients from header filtering.
-#
-# Revision 1.54  2003/09/22 13:36:04  stuart
-# Release 0.6.1
-#
-# Revision 1.53  2003/09/06 07:08:36  stuart
-# dspam support improvements.
-#
-# Revision 1.51  2003/09/02 00:27:27  stuart
-# Should have full milter based dspam support working
-#
-# Revision 1.50  2003/08/26 06:08:17  stuart
-# Use new python boolean since we now require 2.2.2
-#
-# Revision 1.49  2003/08/26 05:45:51  stuart
-# Fix conditional import of dspam.  Update web page.
-#
-# Revision 1.48  2003/08/26 05:10:43  stuart
-# Readability tweaks
-#
-# Revision 1.47  2003/08/26 05:01:38  stuart
-# Release 0.6.0
-#
 # Author: Stuart D. Gathman <stuart@bmsi.com>
-# Copyright 2001 Business Management Systems, Inc.
-# This code is under GPL.  See COPYING for details.
+# Copyright 2001,2002,2003,2004,2005 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
 
 import sys
 import os
@@ -224,9 +218,12 @@ import mime
 import email.Errors
 import Milter
 import tempfile
+import traceback
 import ConfigParser
 import time
 import re
+import Milter.dsn as dsn
+from Milter.dynip import is_dynip as dynip
 
 from fnmatch import fnmatchcase
 from email.Header import decode_header
@@ -261,6 +258,8 @@ log_headers = False
 block_chinese = False
 spam_words = ()
 porn_words = ()
+banned_exts = mime.extlist.split(',')
+scan_zip = False
 scan_html = True
 scan_rfc822 = True
 internal_connect = ()
@@ -281,16 +280,32 @@ srs = None
 srs_reject_spoofed = False
 srs_fwdomain = None
 spf_reject_neutral = ()
+spf_accept_softfail = ()
 spf_best_guess = False
 spf_reject_noptr = False
+multiple_bounce_recipients = True
+time_format = '%Y%b%d %H:%M:%S %Z'
 timeout = 600
+cbv_cache = {}
+try:
+  too_old = time.time() - 30*24*60*60	# 30 days
+  for ln in open('send_dsn.log'):
+    try:
+      rcpt,ts = ln.strip().split(None,1)
+      l = time.strptime(ts,time_format)
+      t = time.mktime(l)
+      if t > too_old:
+	cbv_cache[rcpt] = None
+    except:
+      cbv_cache[ln.strip()] = None
+except IOError: pass
 
 class MilterConfigParser(ConfigParser.ConfigParser):
 
   def getlist(self,sect,opt):
     if self.has_option(sect,opt):
       return [q.strip() for q in self.get(sect,opt).split(',')]
-    return ()
+    return []
 
   def getaddrset(self,sect,opt):
     if not self.has_option(sect,opt):
@@ -337,6 +352,7 @@ def read_config(list):
     'timeout': '600',
     'scan_html': 'no',
     'scan_rfc822': 'yes',
+    'scan_zip': 'no',
     'block_chinese': 'no',
     'log_headers': 'no',
     'blind_wiretap': 'yes',
@@ -344,22 +360,48 @@ def read_config(list):
     'hashlength': '8',
     'reject_spoofed': 'no',
     'reject_noptr': 'no',
-    'best_guess': 'no'
+    'best_guess': 'no',
+    'dspam_internal': 'yes'
   })
   cp.read(list)
+
+  # milter section
   tempfile.tempdir = cp.get('milter','tempdir')
-  global socketname, scan_rfc822, scan_html, block_chinese, timeout
+  global socketname, timeout, check_user, log_headers
+  global internal_connect, internal_domains, trusted_relay, hello_blacklist
   socketname = cp.get('milter','socket')
   timeout = cp.getint('milter','timeout')
-  scan_rfc822 = cp.getboolean('milter','scan_rfc822')
-  scan_html = cp.getboolean('milter','scan_html')
-  block_chinese = cp.getboolean('milter','block_chinese')
-
-  global hide_path, block_forward, log_headers
-  hide_path = cp.getlist('scrub','hide_path')
-  block_forward = cp.getaddrset('milter','block_forward')
+  check_user = cp.getaddrset('milter','check_user')
   log_headers = cp.getboolean('milter','log_headers')
+  internal_connect = cp.getlist('milter','internal_connect')
+  internal_domains = cp.getlist('milter','internal_domains')
+  trusted_relay = cp.getlist('milter','trusted_relay')
+  hello_blacklist = cp.getlist('milter','hello_blacklist')
 
+  # defang section
+  global scan_rfc822, scan_html, block_chinese, scan_zip, block_forward
+  global banned_exts, porn_words, spam_words
+  if cp.has_section('defang'):
+    section = 'defang'
+    # for backward compatibility,
+    # banned extensions defaults to empty only when defang section exists
+    banned_exts = cp.getlist(section,'banned_exts')
+  else:	# use milter section if no defang section for compatibility
+    section = 'milter'
+  scan_rfc822 = cp.getboolean(section,'scan_rfc822')
+  scan_zip = cp.getboolean(section,'scan_zip')
+  scan_html = cp.getboolean(section,'scan_html')
+  block_chinese = cp.getboolean(section,'block_chinese')
+  block_forward = cp.getaddrset(section,'block_forward')
+  porn_words = cp.getlist(section,'porn_words')
+  spam_words = cp.getlist(section,'spam_words')
+
+  # scrub section
+  global hide_path, reject_virus_from
+  hide_path = cp.getlist('scrub','hide_path')
+  reject_virus_from = cp.getlist('scrub','reject_virus_from')
+
+  # wiretap section
   global blind_wiretap, wiretap_users, wiretap_dest, discard_users
   blind_wiretap = cp.getboolean('wiretap','blind')
   wiretap_users = cp.getaddrset('wiretap','users')
@@ -367,17 +409,7 @@ def read_config(list):
   wiretap_dest = cp.getdefault('wiretap','dest')
   if wiretap_dest: wiretap_dest = '<%s>' % wiretap_dest
 
-  global check_user, reject_virus_from, internal_connect, internal_domains
-  check_user = cp.getaddrset('milter','check_user')
-  reject_virus_from = cp.getlist('scrub','reject_virus_from')
-  internal_connect = cp.getlist('milter','internal_connect')
-  internal_domains = cp.getlist('milter','internal_domains')
-
-  global porn_words, spam_words, smart_alias, trusted_relay, hello_blacklist
-  trusted_relay = cp.getlist('milter','trusted_relay')
-  porn_words = cp.getlist('milter','porn_words')
-  spam_words = cp.getlist('milter','spam_words')
-  hello_blacklist = cp.getlist('milter','hello_blacklist')
+  global smart_alias
   for sa in cp.getlist('wiretap','smart_alias'):
     sm = cp.getlist('wiretap',sa)
     if len(sm) < 2:
@@ -387,9 +419,9 @@ def read_config(list):
     key = (sm[0],sm[1])
     smart_alias[key] = sm[2:]
 
-  global dspam_dict, dspam_users, dspam_userdir, dspam_exempt
+  # dspam section
+  global dspam_dict, dspam_users, dspam_userdir, dspam_exempt, dspam_internal
   global dspam_screener,dspam_whitelist,dspam_reject,dspam_sizelimit
-  global spf_reject_neutral,spf_best_guess,SRS,spf_reject_noptr
   dspam_dict = cp.getdefault('dspam','dspam_dict')
   dspam_exempt = cp.getaddrset('dspam','dspam_exempt')
   dspam_whitelist = cp.getaddrset('dspam','dspam_whitelist')
@@ -397,12 +429,17 @@ def read_config(list):
   dspam_userdir = cp.getdefault('dspam','dspam_userdir')
   dspam_screener = cp.getlist('dspam','dspam_screener')
   dspam_reject = cp.getlist('dspam','dspam_reject')
+  dspam_internal = cp.getboolean('dspam','dspam_internal')
   if cp.has_option('dspam','dspam_sizelimit'):
     dspam_sizelimit = cp.getint('dspam','dspam_sizelimit')
 
+  # spf section
+  global spf_reject_neutral,spf_best_guess,SRS,spf_reject_noptr
+  global spf_accept_softfail
   if spf:
     spf.DELEGATE = cp.getdefault('spf','delegate')
     spf_reject_neutral = cp.getlist('spf','reject_neutral')
+    spf_accept_softfail = cp.getlist('spf','accept_softfail')
     spf_best_guess = cp.getboolean('spf','best_guess')
     spf_reject_noptr = cp.getboolean('spf','reject_noptr')
   srs_config = cp.getdefault('srs','config')
@@ -429,13 +466,16 @@ def parse_addr(t):
   return t.split('@')
 
 def parse_header(val):
-  h = decode_header(val)
-  if not len(h) or (not h[0][1] and len(h) == 1): return val
   try:
+    h = decode_header(val)
+    if not len(h) or (not h[0][1] and len(h) == 1): return val
     u = []
     for s,enc in h:
       if enc:
-	u.append(unicode(s,enc))
+        try:
+	  u.append(unicode(s,enc))
+	except LookupError:
+	  u.append(unicode(s))
       else:
 	u.append(unicode(s))
     u = ''.join(u)
@@ -443,13 +483,15 @@ def parse_header(val):
       try:
 	return u.encode(enc)
       except UnicodeError: continue
-  except UnicodeDecodeError:
-    return val
-  except LookupError:
-    return val
+  except UnicodeDecodeError: pass
+  except LookupError: pass
+  except email.errors.HeaderParseError: pass
+  return val
 
 class bmsMilter(Milter.Milter):
-  "Milter to replace attachments poisonous to Windows with a WARNING message."
+  """Milter to replace attachments poisonous to Windows with a WARNING message,
+     check SPF, and other anti-forgery features, and implement wiretapping
+     and smart alias redirection."""
 
   def log(self,*msg):
     print "%s [%d]" % (time.strftime('%Y%b%d %H:%M:%S'),self.id),
@@ -485,7 +527,6 @@ class bmsMilter(Milter.Milter):
     self.log('%s: %s' % (name,val))
 
   def connect(self,hostname,unused,hostaddr):
-    self.missing_ptr = hostname.startswith('[') and hostname.endswith(']')
     self.internal_connection = False
     self.trusted_relay = False
     self.receiver = self.getsymval('j')
@@ -499,9 +540,9 @@ class bmsMilter(Milter.Milter):
 	if fnmatchcase(ipaddr,pat):
 	  self.trusted_relay = True
 	  break
-      self.connectip = ipaddr
-    else:
-      self.connectip = None
+    else: ipaddr = ''
+    self.connectip = ipaddr
+    self.missing_ptr = dynip(hostname,self.connectip)
     for pat in internal_connect:
       if fnmatchcase(hostname,pat):
 	self.internal_connection = True
@@ -512,9 +553,16 @@ class bmsMilter(Milter.Milter):
       connecttype = 'EXTERNAL'
     if self.trusted_relay:
       connecttype += ' TRUSTED'
+    if self.missing_ptr:
+      connecttype += ' DYN'
     self.log("connect from %s at %s %s" % (hostname,hostaddr,connecttype))
     self.hello_name = None
     self.connecthost = hostname
+    if hostname == 'localhost' and not ipaddr.startswith('127.') \
+    or hostname == '.':
+      self.log("REJECT: PTR is",hostname)
+      self.setreply('550','5.7.1', '"%s" is not a reasonable PTR name'%hostname)
+      return Milter.REJECT
     return Milter.CONTINUE
 
   def hello(self,hostname):
@@ -530,6 +578,25 @@ class bmsMilter(Milter.Milter):
       return Milter.REJECT
     return Milter.CONTINUE
 
+  def smart_alias(self,to):
+    if smart_alias:
+      t = parse_addr(to.lower())
+      if len(t) == 2:
+	ct = '@'.join(t)
+      else:
+	ct = t[0]
+      cf = self.canon_from
+      cf0 = cf.split('@',1)
+      if len(cf0) == 2:
+	cf0 = '@' + cf0[1]
+      else:
+	cf0 = cf
+      for key in ((cf,ct),(cf0,ct)):
+	if smart_alias.has_key(key):
+	  self.del_recipient(to)
+	  for t in smart_alias[key]:
+	    self.add_recipient('<%s>'%t)
+
   # multiple messages can be received on a single connection
   # envfrom (MAIL FROM in the SMTP protocol) seems to mark the start
   # of each message.
@@ -546,10 +613,12 @@ class bmsMilter(Milter.Milter):
     self.reject_spam = True
     self.data_allowed = True
     self.trust_received = self.trusted_relay
+    self.trust_spf = self.trusted_relay
     self.redirect_list = []
     self.discard_list = []
     self.new_headers = []
     self.recipients = []
+    self.cbv_needed = None
     t = parse_addr(f.lower())
     self.canon_from = '@'.join(t)
     self.fp.write('From %s %s\n' % (self.canon_from,time.ctime()))
@@ -561,9 +630,21 @@ class bmsMilter(Milter.Milter):
 	    self.log("REJECT: spam from self",pat)
 	    self.setreply('550','5.7.1','I hate talking to myself.')
 	    return Milter.REJECT
+      elif internal_domains:
+	for pat in internal_domains:
+	  if fnmatchcase(domain,pat): break
+	else:
+	  self.log("REJECT: zombie PC at ",self.connectip," sending MAIL FROM ",
+	  	self.canon_from)
+	  self.setreply('550','5.7.1','Get rid of your virus!',
+	  'Your PC is using an unauthorized MAIL FROM.',
+	  'It is either badly misconfigured or controlled by organized crime.'
+	  )
+	  return Milter.REJECT
       self.rejectvirus = domain in reject_virus_from
       if user in wiretap_users.get(domain,()):
         self.add_recipient(wiretap_dest)
+	self.smart_alias(wiretap_dest)
       if user in discard_users.get(domain,()):
 	self.discard = True
       exempt_users = dspam_whitelist.get(domain,())
@@ -583,42 +664,92 @@ class bmsMilter(Milter.Milter):
   def check_spf(self):
     t = parse_addr(self.mailfrom)
     if len(t) == 2: t[1] = t[1].lower()
-    q = spf.query(self.connectip,'@'.join(t),self.hello_name)
+    receiver = self.receiver
+    q = spf.query(self.connectip,'@'.join(t),self.hello_name,receiver=receiver)
     q.set_default_explanation('SPF fail: see http://spf.pobox.com/why.html')
     res,code,txt = q.check()
-    receiver = self.receiver
-    if res == 'none':
+    if res in ('none', 'softfail'):
       if self.mailfrom != '<>':
 	# check hello name via spf
-	hres,hcode,htxt = spf.check(self.connectip,'',self.hello_name)
+	h = spf.query(self.connectip,'',self.hello_name,receiver=receiver)
+	hres,hcode,htxt = h.check()
 	if hres in ('deny','fail','neutral','softfail'):
-	  self.log('REJECT: hello SPF: %s %i %s' % (hres,hcode,htxt))
-	  self.setreply('550','5.7.1',htxt)
+	  self.log('REJECT: hello SPF: %s 550 %s' % (hres,htxt))
+	  self.setreply('550','5.7.1',htxt,
+	    "The hostname given in your MTA's HELO response is not listed",
+	    "as a legitimate MTA in the SPF records for your domain.  If you",
+	    "get this bounce, the message was not in fact a forgery, and you",
+	    "should IMMEDIATELY notify your email administrator of the problem."
+	  )
 	  return Milter.REJECT
-      if spf_best_guess:
+	if hres == 'none' and spf_best_guess \
+	  and not dynip(self.hello_name,self.connectip):
+	  hres,hcode,htxt = h.best_guess()
+      else: hres = res
+      if spf_best_guess and res == 'none':
 	#self.log('SPF: no record published, guessing')
 	q.set_default_explanation(
 		'SPF guess: see http://spf.pobox.com/why.html')
 	# best_guess should not result in fail
-	res,code,txt = q.best_guess()
+	if self.missing_ptr:
+	  # ignore dynamic PTR for best guess
+	  res,code,txt = q.best_guess('v=spf1 a/24 mx/24')
+	else:
+	  res,code,txt = q.best_guess()
 	receiver += ': guessing'
-      if self.missing_ptr and res in ('neutral', 'none') and spf_reject_noptr:
-        self.log('REJECT: no PTR or SPF')
-	self.setreply('550','5.7.1',
-  'You must have a reverse lookup or publish SPF: http://spf.pobox.com'
-	)
-	return Milter.REJECT
+      if self.missing_ptr and res in ('neutral', 'none') and hres != 'pass':
+	if spf_reject_noptr:
+	  self.log('REJECT: no PTR, HELO or SPF')
+	  self.setreply('550','5.7.1',
+    'You must have a reverse lookup or publish SPF: http://spf.pobox.com',
+    'Contact your mail administrator IMMEDIATELY!  Your mail server is',
+    'severely misconfigured.  It has no PTR record (dynamic PTR records',
+    "that contain your IP don't count), an invalid HELO, and no SPF record."
+	  )
+	  return Milter.REJECT
+        if self.mailfrom != '<>':
+	  q.result = res
+	  self.cbv_needed = q
     if res in ('deny', 'fail'):
       self.log('REJECT: SPF %s %i %s' % (res,code,txt))
       self.setreply(str(code),'5.7.1',txt)
+      # A proper SPF fail error message would read:
+      # forger.biz [1.2.3.4] is not allowed to send mail with the domain
+      # "forged.org" in the sender address.  Contact <postmaster@forged.org>.
       return Milter.REJECT
+    if res == 'softfail' and not q.o in spf_accept_softfail:
+      if self.missing_ptr and hres != 'pass':
+        if spf_reject_noptr or q.o in spf_reject_neutral:
+	  self.log('REJECT: SPF %s %i %s' % (res,code,txt))
+	  self.setreply('550','5.7.1',
+	    'SPF softfail: If you get this Delivery Status Notice, your email',
+	    'was probably legitimate.  Your administrator has published SPF',
+	    'records in a testing mode.  The SPF record reported your email as',
+	    'a forgery, which is a mistake if you are reading this.  Please',
+	    'notify your administrator of the problem immediately.'
+	  )
+	  return Milter.REJECT
+      if self.mailfrom != '<>':
+        q.result = res
+	self.cbv_needed = q
     if res == 'neutral' and q.o in spf_reject_neutral:
       self.log('REJECT: SPF neutral for',q.s)
       self.setreply('550','5.7.1',
-	'mail from %s must pass SPF: http://spf.pobox.com/why.html' % q.o
+	'mail from %s must pass SPF: http://spf.pobox.com/why.html' % q.o,
+	'The %s domain is one that spammers love to forge.  Due to' % q.o,
+	'the volume of forged mail, we can only accept mail that',
+	'the SPF record for %s explicitly designates as legitimate.' % q.o,
+	'Sending your email through the recommended outgoing SMTP',
+	'servers for %s should accomplish this.' % q.o
       )
       return Milter.REJECT
     if res == 'error':
+      if code >= 500:
+        self.log('REJECT: SPF %s %i %s' % (res,code,txt))
+	# latest SPF draft recommends 5.5.2 instead of 5.7.1
+	self.setreply(str(code),'5.5.2',txt)
+	return Milter.REJECT
+      self.log('TEMPFAIL: SPF %s %i %s' % (res,code,txt))
       self.setreply(str(code),'4.3.0',txt)
       return Milter.TEMPFAIL
     self.add_header('Received-SPF',q.get_header(res,receiver))
@@ -638,23 +769,21 @@ class bmsMilter(Milter.Milter):
       user,domain = t
       if self.mailfrom == '<>' or self.canon_from.startswith('postmaster@') \
       	or self.canon_from.startswith('mailer-daemon@'):
-        if self.recipients:
-	  self.log('REJECT: Multiple bounce recipients')
-	  self.setreply('550','5.7.1','Multiple bounce recipients')
-	  return Milter.REJECT
-        if srs and not (self.internal_connection or self.trusted_relay) \
-		and domain == srs_fwdomain:
+        if self.recipients and not multiple_bounce_recipients:
+	  self.data_allowed = False
+        if srs and domain == srs_fwdomain:
 	  oldaddr = '@'.join(parse_addr(to))
 	  try:
 	    newaddr = srs.reverse(oldaddr)
 	    # Currently, a sendmail map reverses SRS.  We just log it here.
 	    self.log("srs rcpt:",newaddr)
 	  except:
-	    if srsre.match(oldaddr):
-	      self.log("REJECT: srs spoofed:",oldaddr)
-	      self.setreply('550','5.7.1','Invalid SRS signature')
-	      return Milter.REJECT
-	    self.data_allowed = not srs_reject_spoofed
+            if not (self.internal_connection or self.trusted_relay):
+	      if srsre.match(oldaddr):
+		self.log("REJECT: srs spoofed:",oldaddr)
+		self.setreply('550','5.7.1','Invalid SRS signature')
+		return Milter.REJECT
+	      self.data_allowed = not srs_reject_spoofed
       # non DSN mail to SRS address will bounce due to invalid local part
       self.recipients.append('@'.join(t))
       users = check_user.get(domain)
@@ -672,19 +801,7 @@ class bmsMilter(Milter.Milter):
         self.hidepath = True
       if not domain in dspam_reject:
         self.reject_spam = False
-    if smart_alias:
-      cf = self.canon_from
-      cf0 = cf.split('@',1)
-      if len(cf0) == 2:
-	cf0 = '@' + cf0[1]
-      else:
-	cf0 = cf
-      ct = '@'.join(t)
-      for key in ((cf,ct),(cf0,ct)):
-	if smart_alias.has_key(key):
-	  self.del_recipient(to)
-	  for t in smart_alias[key]:
-	    self.add_recipient('<%s>'%t)
+    self.smart_alias(to)
     #rcpt = self.getsymval("{rcpt_addr}")
     #self.log("rcpt-addr",rcpt);
     return Milter.CONTINUE
@@ -744,21 +861,36 @@ class bmsMilter(Milter.Milter):
     elif self.trust_received and lname == 'received':
       self.trust_received = False
       self.log('%s: %s' % (name,val.splitlines()[0]))
+    elif self.trust_spf and lname == 'received-spf':
+      self.trust_spf = False
+      self.log('%s: %s' % (name,val.splitlines()[0]))
     return Milter.CONTINUE
 
+  def forged_bounce(self):
+    if len(self.recipients) > 1:
+      self.log('REJECT: Multiple bounce recipients')
+      self.setreply('550','5.7.1','Multiple bounce recipients')
+    else:
+      self.log('REJECT: bounce with no SRS encoding')
+      self.setreply('550','5.7.1',
+      "I did not send you that message. Please consider implementing SPF",
+      "(http://spf.pobox.com) to avoid bouncing mail to spoofed senders.",
+      "Thank you."
+      )
+    return Milter.REJECT
+    
   def header(self,name,hval):
     if not self.data_allowed:
-      self.log('REJECT: bounce with no SRS encoding')
-      self.setreply('550','5.7.1',"I did not send you this message.")
-      return Milter.REJECT
+      return self.forged_bounce()
+	  
     lname = name.lower()
     # decode near ascii text to unobfuscate
     val = parse_header(hval)
     if not self.internal_connection:
       # even if we wanted the Taiwanese spam, we can't read Chinese
       if block_chinese and lname == 'subject':
-	if hval.startswith('=?big5') or hval.startswith('=?ISO-2022-JP'):
-	  self.log('REJECT: %s: %s' % (name,hval))
+	if val.startswith('=?big5') or val.startswith('=?ISO-2022-JP'):
+	  self.log('REJECT: %s: %s' % (name,val))
 	  self.setreply('550','5.7.1',"We don't understand chinese")
 	  return Milter.REJECT
       rc = self.check_header(name,val)
@@ -770,12 +902,14 @@ class bmsMilter(Milter.Milter):
       try:
         val = val.encode('us-ascii')
       except:
-        val = hval
+	val = hval
       self.fp.write("%s: %s\n" % (name,val))	# add header to buffer
     return Milter.CONTINUE
 
   def eoh(self):
     if not self.fp: return Milter.TEMPFAIL	# not seen by envfrom
+    if not self.data_allowed:
+      return self.forged_bounce()
     for name,val in self.new_headers:
       self.fp.write("%s: %s\n" % (name,val))	# add new headers to buffer
     self.fp.write("\n")				# terminate headers
@@ -783,8 +917,9 @@ class bmsMilter(Milter.Milter):
     # copy headers to a temp file for scanning the body
     headers = self.fp.getvalue()
     self.fp.close()
-    self.tempname = fname = tempfile.mktemp(".defang")
-    self.fp = open(fname,"w+b")
+    fd,fname = tempfile.mkstemp(".defang")
+    self.tempname = fname
+    self.fp = os.fdopen(fd,"w+b")
     self.fp.write(headers)	# IOError (e.g. disk full) causes TEMPFAIL
     # check if headers are really spammy
     if dspam_dict and not self.internal_connection:
@@ -816,15 +951,27 @@ class bmsMilter(Milter.Milter):
 	for i in range(len(h),0,-1):
 	  self.chgheader(name,i-1,'')
 
+  def _chk_ext(self,name):
+    "Check a name for dangerous Winblows extensions."
+    if not name: return name
+    lname = name.lower()
+    for ext in self.bad_extensions:
+      if lname.endswith(ext): return name
+    return None
+
+    
   def _chk_attach(self,msg):
     "Filter attachments by content."
-    mime.check_name(msg,self.tempname)	# check for bad extensions
+    # check for bad extensions
+    mime.check_name(msg,self.tempname,ckname=self._chk_ext,scan_zip=scan_zip)
+    # remove scripts from HTML
     if scan_html:
-      mime.check_html(msg,self.tempname)	# remove scripts from HTML
+      mime.check_html(msg,self.tempname)	
     # don't let a tricky virus slip one past us
     if scan_rfc822:
       msg = msg.get_submsg()
-      if msg: return mime.check_attachments(msg,self._chk_attach)
+      if isinstance(msg,email.Message.Message):
+	return mime.check_attachments(msg,self._chk_attach)
     return Milter.CONTINUE
 
   def alter_recipients(self,discard_list,redirect_list):
@@ -892,7 +1039,8 @@ class bmsMilter(Milter.Milter):
 	      self.fp = StringIO.StringIO(txt)
 	      modified = True
 	  except Exception,x:
-	    print x
+	    self.log("check_spam:",x)
+	    traceback.print_exc()
     # screen if no recipients are dspam_users
     if not modified and dspam_screener and not self.internal_connection \
     	and self.dspam:
@@ -926,11 +1074,13 @@ class bmsMilter(Milter.Milter):
 
       # analyze all mail for dangerous attachments and scripts
       self.fp.seek(0)
-      msg = mime.MimeMessage(self.fp)
+      msg = mime.message_from_file(self.fp)
       # pass header changes in top level message to sendmail
       msg.headerchange = self._headerChange
 
       # filter leaf attachments through _chk_attach
+      assert not msg.ismodified()
+      self.bad_extensions = ['.' + x for x in banned_exts]
       rc = mime.check_attachments(msg,self._chk_attach)
     except:	# milter crashed trying to analyze mail
       exc_type,exc_value = sys.exc_info()[0:2]
@@ -947,6 +1097,9 @@ class bmsMilter(Milter.Milter):
       self.tempname = None
       if exc_type == email.Errors.BoundaryError:
 	self.log("MALFORMED: %s" % fname)	# log filename
+        if self.internal_connection:
+	  # accept anyway for now
+	  return Milter.ACCEPT
 	self.setreply('554','5.7.7',
 		'Boundary error in your message, are you a spammer?')
         return Milter.REJECT
@@ -982,6 +1135,42 @@ class bmsMilter(Milter.Milter):
     for name,val in self.new_headers:
       self.addheader(name,val)
 
+    if self.cbv_needed:
+      q = self.cbv_needed
+      sender = q.s
+      cached = cbv_cache.has_key(sender)
+      if cached:
+	self.log('CBV:',sender,'(cached)')
+        res = cbv_cache[sender]
+      else:
+	self.log('CBV:',sender)
+	try:
+	  if q.result == 'softfail':
+	    template = file('softfail.txt').read()
+	  else:
+	    template = file('strike3.txt').read()
+	except IOError: template = None
+	m = dsn.create_msg(q,self.recipients,msg,template)
+        m = m.as_string()
+        print >>open('last_dsn','w'),m
+	res = dsn.send_dsn(sender,self.receiver,m)
+      if res:
+        desc = "CBV: %d %s" % res[:2]
+        if 400 <= res[0] < 500:
+	  self.log('TEMPFAIL:',desc)
+          self.setreply('450','4.2.0',*desc.splitlines())
+	  return Milter.TEMPFAIL
+	if len(res) < 3: res += time.time(),
+	cbv_cache[sender] = res
+	self.log('REJECT:',desc)
+        self.setreply('550','5.7.1',*desc.splitlines())
+	return Milter.REJECT
+      cbv_cache[sender] = res
+      if not cached:
+        s = time.strftime(time_format,time.localtime())
+	print >>open('send_dsn.log','a'),sender,s # log who we sent DSNs to
+      self.cbv_needed = None
+
     if not defanged and not spam_checked:
       os.remove(self.tempname)
       self.tempname = None	# prevent re-removal

faq.html

@@ -72,6 +72,9 @@ milter-0.4.5 or later to remove this dependency.
 <code>set_flags()</code> before calling <code>runmilter()</code>.  For
 instance, <code>Milter.set_flags(Milter.ADDRCPT)</code>.  You must add together
 all of <code>ADDHDRS, CHGBODY, ADDRCPT, DELRCPT, CHGHDRS</code> that apply.
+<p> NOTE - recent versions default flags to enabling all features.  You
+must now call <code>set_flags()</code> if you wish to disable features for
+efficiency.
 <p>
 
 <li> Q. Why does sendmail sometimes print something like:
@@ -94,14 +97,19 @@ for your specific needs.  We will of course continue to move generic
 code out of the sample as the project evolves.  Think of sample.py as
 an active config file.
 <p>
+If you are running bms.py, then the block_chinese option in 
+<code>/etc/mail/pymilter.cfg</code> controls this feature.
+<p>
 
 <li> Q. Why does sendmail coredump with milters on OpenBSD?
-<p>  A. Sendmail has a problem with unix sockets on OpenBSD.  Use
-an internet domain socket instead.  For example, in <code>sendmail.cf</code> use
+<p>  A. Sendmail has a problem with unix sockets on old versions of OpenBSD.
+Use an internet domain socket instead.  For example, in
+<code>sendmail.cf</code> use
 <pre>
 Xpythonfilter, S=inet:1234@localhost
 </pre>
 and change sample.py accordingly.
+<p> OpenBSD users report that this problem has been fixed.
 <p>
 
 <li> Q. How can I change the bounce message for an invalid recipient?
@@ -143,8 +151,8 @@ everything up for you.  For other systems:
 <li> Arrange to run bms.py in the background (as a service perhaps) and
      redirect output and errors to a logfile.  For instance, on AIX you'll want
      to use SRC (System Resource Controller).  
-<li> Copy milter.cfg to the directory you run bms.py in, and edit it.  The
-     comments should explain the options. 
+<li> Copy pymilter.cfg to the /etc/mail or the directory you run bms.py in,
+     and edit it.  The comments should explain the options. 
 <li> Start bms.py in the background as arranged.
 <li> Add Xpythonfilter to sendmail.cf or add an INPUT_MAIL_FILTER to
      sendmail.mc.  Regen sendmail.cf if you use sendmail.mc and restart 

milter.cfg

@@ -1,65 +1,96 @@
-# features intended to filter or block incoming mail
 [milter]
-;socket=/var/run/milter/pythonsock
+# the socket used to communicate with sendmail.  Must match sendmail.cf
+socket=/var/run/milter/pythonsock
+# where to save original copies of defanged and failed messages
 tempdir = /var/log/milter/save
+# how long to wait for a response from sendmail before giving up 
 ;timeout=600
-
-scan_rfc822 = 1
-# can be CPU intensive
-scan_html = 0
-# reject asian fonts because we can't read them
-block_chinese = 1
-# users who hate forwarded mail
-;block_forward = egghead@mycorp.com, busybee@mycorp.com
 log_headers = 0
-# Reject mail for domains mentioned unless user is mentioned here also
-;check_user = joe@mycorp.com, mary@mycorp.com, file:bigcorp.com
-# porn words are case insensitive
-porn_words = penis, breast, pussy, horse cock, porn, xenical, diet pill, d1ck,
-	vi*gra, vi-a-gra, viag, tits, p0rn, hunza, horny, sexy, c0ck,
-	p-e-n-i-s, hydrocodone, vicodin, xanax, vicod1n, x@nax, diazepam,
-	v1@gra, xan@x, cialis, ci@lis, frëe, xãnax, valíum, vãlium, via-gra,
-	x@n3x, vicod3n, penís, c0d1n, phentermine, en1arge, dip1oma, v1codin
-# spam words are case sensitive
-spam_words = $$$, !!!, XXX, FREE, HGH
-
 # connection ips and hostnames are matched against this glob style list
-# to recognize internal senders
+# to recognize internal senders.
 ;internal_connect = 192.168.*.*
+
 # mail that is not an internal_connect and claims to be from an
-# internal domain is rejected.
+# internal domain is rejected.  Furthermore, internal mail that
+# does not claim to be from an internal domain is rejected.
+# You should enable SPF instead if you can.  SPF is much more comprehensive and
+# flexible.  However, SPF is not currently checked for outgoing
+# (internal_connect) mail because it doesn't yet handle authorizing 
+# internal IPs locally.
 ;internal_domains = mycorp.com
+
 # connections from a trusted relay can trust the first Received header
+# SPF checks are bypassed for internal connections and trusted relays.
 ;trusted_relay = 1.2.3.4, 66.12.34.56
-# reject external senders with hello names no legit external sender would use
+
+# Reject external senders with hello names no legit external sender would use.
+# SPF will do this also, but listing your own domain and mailserver here
+# will save some DNS lookups when rejecting certain viruses.
 ;hello_blacklist = mycorp.com, 66.12.34.56
 
+# Reject mail for domains mentioned unless user is mentioned here also
+;check_user = joe@mycorp.com, mary@mycorp.com, file:bigcorp.com
+
+# features intended to filter or block incoming mail
+[defang]
+
+# do virus scanning on attached messages also
+scan_rfc822 = 1
+# do virus scanning on attached zipfiles also
+scan_zip = 0
+# Comment out scripts in HTML attachments.  Can be CPU intensive.
+scan_html = 0
+# reject messages with asian fonts because we can't read them
+block_chinese = 1
+# list users who hate forwarded mail
+;block_forward = egghead@mycorp.com, busybee@mycorp.com
+# reject mail with these case insensitive strings in the subject
+porn_words = penis, breast, pussy, horse cock, porn, xenical, diet pill, d1ck,
+	vi*gra, vi-a-gra, viag, tits, p0rn, hunza, horny, sexy, c0ck, xanaax,
+	p-e-n-i-s, hydrocodone, vicodin, xanax, vicod1n, x@nax, diazepam,
+	v1@gra, xan@x, cialis, ci@lis, frëe, xãnax, valíum, vãlium, via-gra,
+	x@n3x, vicod3n, penís, c0d1n, phentermine, en1arge, dip1oma, v1codin,
+	valium, rolex, sexual, fuck
+# reject mail with these case sensitive strings in the subject
+spam_words = $$$, !!!, XXX, FREE, HGH
+# attachments with these extensions will be replaced with a warning
+# message.  A copy of the original will be saved. 
+banned_exts = ade,adp,asd,asx,asp,bas,bat,chm,cmd,com,cpl,crt,dll,exe,hlp,hta,
+	inf,ins,isp,js,jse,lnk,mdb,mde,msc,msi,msp,mst,ocx,pcd,pif,reg,scr,sct,
+	shs,url,vb,vbe,vbs,wsc,wsf,wsh 
+
+# See http://bmsi.com/python/pysrs.html for details
 [srs]
 config=/etc/mail/pysrs.cfg
+# SRS options can be set here also, but must match the sendmail plugin
 ;secret="shhhh!"
 ;maxage=21
 ;hashlength=4
 ;database=/var/log/milter/srsdata
 ;fwdomain = mydomain.com
-# turn this on after a grace period
+# turn this on after a grace period to reject spoofed DSNs
 reject_spoofed = 0
 
+# See http://spf.pobox.com for more info on SPF.
 [spf]
 # namespace where SPF records can be supplied for domains without one
-# records are search for under _spf.domain.com
+# records are searched for under _spf.domain.com
 ;delegate = domain.com
 # domains where a neutral SPF result should cause mail to be rejected
 ;reject_neutral = aol.com
 # use a default (v=spf1 a/24 mx/24 ptr) when no SPF records are published
 ;best_guess = 0
-# reject senders that have neither PTR nor SPF records
+# Reject senders that have neither PTR nor valid HELO nor SPF records, or send
+# DSN otherwise
 ;reject_noptr = 0
+# always accept softfail from these domains, or send DSN otherwise
+;accept_softfail = bounces.amazon.com
 
 # features intended to clean up outgoing mail
 [scrub]
-# domains that stupidly block visible private nodes
+# domains that block visible private nodes
 ;hide_path = jcpenney.com	
-# block, don't just replace with warning, viruses from these domains
+# reject, don't just replace with warning, viruses from these domains
 ;reject_virus_from = mycorp.com
 
 # features intended for spying on users and coworkers
@@ -87,18 +118,24 @@ blind = 1
 # additional copies can be added
 ;walter1 = cust@othercorp.com,walter@bigcorp.com,boss@bigcorp.com,
 ;	walter@bigcorp.com
+;bulk = soruce@telex.com,bob@jsconnor.com
+;bulk = soruce@telex.com,larry@jsconnor.com
 
+# See http://bmsi.com/python/dspam.html
 [dspam]
-# Select a well moderated dspam dictionary to reject spammy headers
-# dspam-python must be installed to use: http://bmsi.com/python/dspam.html
+# Select a well moderated dspam dictionary to reject spammy headers.
+# To filter on the entire message, use the full setup below.
 # only EXTERNAL messages are dspam filtered
 ;dspam_dict=/var/lib/dspam/moderator.dict
+
 # Opt-opt recipients from dspam screening and header triage
 ;dspam_exempt=getitall@mycorp.com
 # Do not scan mail (ostensibly) from these senders
 ;dspam_whitelist=getitall@sender.com
-# Reject spam to these domains, perhaps because we are a backup MX server
+# Reject spam to these domains instead of quarantining it.
 ;dspam_reject=othercorp.com
+# Scan internal mail - often a good source of stats on legit mail.
+;dspam_internal=1
 
 # directory for dspam user quarantine, signature db, and dictionaries
 # defining this activates the dspam application
@@ -115,8 +152,9 @@ blind = 1
 ;spam=spam@foocorp.com
 # address to forward false positives to.  milter will process and not deliver
 ;falsepositive=ham@foocorp.com
-# the dspam_screener is used to screen mail for all recipients who are
-# not dspam_users.  Spam goes to the screeners quarantine, and the original
-# recipients saved so that false positives can be properly delivered.
-
+# the dspam_screener is a list of dspam users who screen mail for all
+# recipients who are not dspam_users.  Spam goes to the screeners quarantine,
+# and the original recipients are saved so that false positives can be properly
+# delivered.
+;dspam_screener=david,goliath
 # The dspam CGI can also be used: logins must match dspam users

milter.html

@@ -13,8 +13,8 @@ ALT="Viewable With Any Browser" BORDER="0"></A>
 	usemap="#banner_4" alt="Your vote?">
 <map name="banner_4">
   <area shape="rect" coords="330,25,426,59"
-  	href="http://www.sepschool.org/survey/" alt="I Disagree">
-  <area shape="rect" coords="234,28,304,57" href="http://sepschool.org/" alt="I Agree">
+  	href="http://education-survey.org/" alt="I Disagree">
+  <area shape="rect" coords="234,28,304,57" href="http://www.honestEd.com/" alt="I Agree">
 </map>
 
 </P>
@@ -24,12 +24,16 @@ ALT="Viewable With Any Browser" BORDER="0"></A>
   Stuart D. Gathman</a><br>
 This web page is written by Stuart D. Gathman<br>and<br>sponsored by
 <a href="http://www.bmsi.com">Business Management Systems, Inc.</a> <br>
-Last updated Jun 08, 2004</h4>
+Last updated Jun 09, 2005</h4>
 
-See the <a href="faq.html">FAQ</a> | <a href="#download">Download now</a> |
-<a href="/mailman/listinfo/pymilter">Subscribe to mailing list</a>
+See the <a href="faq.html">FAQ</a> | <a href="http://sourceforge.net/project/showfiles.php?group_id=139894">Download now</a> |
+<a href="/mailman/listinfo/pymilter">Subscribe to mailing list</a> |
+<a href="#overview">Overview</a> |
+<a href="/python/dspam.html">pydspam</a> |
+<a href="/libdspam/dspam.html">libdspam</a>
 <p>
-<img src="python55.gif" align=left alt="A Python">
+<a href="//www.python.org">
+<img src="python55.gif" align=left alt="A Python"></a>
 <a href="//www.sendmail.org/">Sendmail</a> introduced a
 <a href="http://www.milter.org/milter_api/api.html"> new API</a> beginning with version 8.10 -
 libmilter.  The milter module for <a href="//www.python.org">Python</a>
@@ -37,11 +41,91 @@ provides a python interface to libmilter that exploits all its features.
 <p>
 Sendmail 8.12 officially releases libmilter.  
 Version 8.12 seems to be more robust, and includes new privilege
-separation features to enhance security.
-I recommend upgrading.
+separation features to enhance security.  Even better, sendmail 8.13
+supports socket maps, which makes <a href="pysrs.html">pysrs</a> much more
+efficient and secure.  I recommend upgrading.
 
 <h2> Recent Changes </h2>
 
+Python milter is being moved to 
+<a href="http://sourceforge.net/projects/pymilter/">pymilter Sourceforge
+project</a> for development.
+<p>
+Release 0.8.0 is the first <a href="http://sourceforge.net/">Sourceforge</a>
+release.  It supports Python-2.4, and provides an option to accept mail
+that gets an SPF softfail or fails the 3 strikes rule, provided the
+alleged sender accepts a DSN explaining the problem.  Python-2.3 is
+no longer supported by the reworked mime.py module, although API changes
+could be backported.  There are too many incompatible changes to the
+python email package.
+<p>
+Release 0.7.2 tightens the authentication screws with a "3 strikes and
+you're out" policy.  A sender must have a valid PTR, HELO, or SPF record
+to send email.  Specific senders can be whitelisted using the
+"delegate" option in the spf configuration section by adding a
+default SPF record for them.  The PTR and HELO are required
+by RFC anyway, so this is not an unreasonable requirement.
+There is now a coherent policy for an SPF softfail result.  A softfail
+is accepted if there is a valid PTR or HELO, or if the domain
+is listed in the "accept_softfail" option of the spf configuration section.
+A neutral result is accepted by default if there is a valid PTR or
+HELO, (and the SPF record was not guessed), unless the domain is listed in the
+"reject_neutral" option.  Common forms of PTR records for dynamic IPs are
+recognized, and do not count as a valid PTR.  This does not prevent anyone
+from sending mail from a dynamic IP - they just need to configure a
+valid HELO name or publish an SPF record.
+<p>
+As SPF adoption continues to rise, forged spam is not getting through.  So
+spammers are publishing their SPF records as predicted.  The 0.7.2 RPM
+now provides the <code>rhsbl</code> sendmail hack so that spammer domains
+can be blacklisted.  With the RPM installed, add a line like the following
+to your <code>sendmail.mc</code>.
+<pre>
+HACK(rhsbl,`blackholes.example.com',"550 Rejected: " $&{RHS} " has been spamming our customers.")dnl
+</pre>
+<p>
+Of course, spammers are now starting to register
+throwaway domains.  The next thing we need is a custom DNS server,
+in Python, that
+can recognize patterns.  For instance, one spammer registers ded304.com,
+ded305.com, ded306.com, etc.  We also need the custom DNS server to
+let SPF classic clients check SES (which will be part of pysrs).  
+The <a href="http://twistedmatrix.com/products/twisted">Twisted Python</a>
+framework provides a custom DNS server - but I
+would like a smaller implementation for our use.
+<p>
+The RPM for release 0.7.0 moves the config file and socket locations to
+/etc/mail and /var/run/milter respectively.  We now parse Microsoft CID records
+- but only hotmail.com uses them.  They seem to have applied for a patent on
+the brilliant idea of examining the mail headers to see who the message is
+from.  We aren't doing that here, so not to worry - but I am not a lawyer, so
+if you are worried, change spf.py around line 626 to return None instead of
+calling CIDParser().  There is a new option to reject mail with no PTR
+and no SPF.
+<p>
+Microsoft is pushing an anti-opensource license for their pending patent
+along with their sender-ID proposal before the IETF.
+It is royalty free - but requires anyone distributing a binary they've
+compiled from source to sign a license agreement.  The Apache Software
+Foundation <a
+href="http://www.apache.org/foundation/docs/sender-id-position.html"> explains
+the problem with sender-ID</a>, and Debian <a
+href="http://www.debian.org/News/2004/20040904">concurs</a>.  Since 
+the <a href="http://download.microsoft.com/download/4/3/9/439b024b-09fd-44ee-8ff0-10e834004c36/senderid_FAQ.PDF">Microsoft license</a> is
+<a href="http://www.circleid.com/article/732_0_1_0_C/">incompatible with free
+software in general</a> and the <a
+href="http://www.imc.org/ietf-mxcomp/mail-archive/msg03678.html">GPL in
+particular</a>, Python milter will not be able to implement sender-ID in its
+current form.  This was, no doubt, Microsoft's intent all along.
+<p>
+Sender-ID attempts to do for RFC2822 headers what SPF does for RFC2821 headers.
+Unlike SPF, it has never been tried, and is encumbered by a stupid patent.  I
+recommend ignoring it and continuing to implement and improve SPF until a
+working and unencumbered proposal for RFC2822 headers surfaces.
+
+<p>
+<a href="http://spf.pobox.com">
+<img src="SPF.gif" align=left alt="SPF logo"></a>
 Release 0.6.6 adds support for <a href="http://spf.pobox.com/">SPF</a>,
 a protocol to prevent forging of the envelope from address.  
 SPF support requires <a href="http://pydns.sourceforge.net/">pydns</a>.
@@ -106,7 +190,7 @@ entries.  Be sure to handle both Bcc and file copies, and designating what
 mail should be copied.  How should "outgoing" be defined?  Implementing it is
 easy once the configuration is designed.
 
-<h3>Overview</h3>
+<h3><a name=overview>Overview</a></h3>
 
 This package provides a robust toolkit for Python <a
 href="#milter">milters</a>, and the beginnings of a general purpose mail
@@ -138,244 +222,24 @@ methods that
 do nothing, and also provides wrappers for the libmilter methods to mutate
 the message.
 <p>
+The 'spf' module provides an implementation of <a href="http://spf.pobox.com">
+SPF</a> useful for detecting email forgery.
+<p>
+The 'mime' module provides a wrapper for the Python email package that
+fixes some bugs, and simplifies modifying selected parts of a MIME message.
+<p>
 Finally, the bms.py application is both a sample of how to use the
-Milter module, and the beginnings of a general purpose SPAM filtering,
-wiretapping, and Win32 virus protection milter.
-
-<h3><a name=download>Downloading</a></h3>
-
-The latest stable release is <a href="#stable">0.6.9</a>. A stable
-release is one which has been installed (and working correctly) on
-production systems long enough to convince me that it is stable.  As
-the package gains more features and complexity, stable will mean no
-bug reports from outside users either.
-<p>
-The latest version is 0.6.9-1.  See the <a href=NEWS>Change Log</a>.
-<p>
-<a name="stable"><b>Stable</b></a>
-<a href="http://bmsi.com/python/milter-0.6.9.tar.gz">
-milter-0.6.9.tar.gz</a> Add SPF test suite driver, and validate
-spf.py against test suite.  Add best_guess and get_header to spf.py.
-Libmilter timeout option in config.
-<br>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.9-1.i386.rpm">
-milter-0.6.9-1.i386.rpm</a> Binary RPM for Redhat 7.x, now requires 
-	sendmail-8.12 and <a href="http://www.python.org/2.3.3/rpms.html">
-	python2.3</a>.
-<br>
-<a href="http://bmsi.com/linux/rh9/milter-0.6.9-1.src.rpm">
-milter-0.6.9-1.src.rpm</a> Source RPM for Redhat 9,7.x.  
-<p>
-<a href="http://bmsi.com/python/milter-0.6.8.tar.gz">
-milter-0.6.8.tar.gz</a> Include Received-SPF headers in Dspam analysis.
-Fix sysv init for Redhat 9 and later.  Reject bounces with multiple
-recipients.
-<br>
-<a href="http://bmsi.com/python/milter-0.6.8.patch">milter-0.6.8.patch</a>
-Last minutes fixes from production testing.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.8-3.i386.rpm">
-milter-0.6.8-3.i386.rpm</a> Binary RPM for Redhat 7.x, now requires 
-	sendmail-8.12 and <a href="http://www.python.org/2.3.3/rpms.html">
-	python2.3</a>. 
-<br>
-<a href="http://bmsi.com/linux/rh9/milter-0.6.8-3.src.rpm">
-milter-0.6.8-3.src.rpm</a> Source RPM for Redhat 9,7.x.  
-<p>
-<a href="http://bmsi.com/python/milter-0.6.7.tar.gz">
-milter-0.6.7.tar.gz</a> Explicit local socket bug,
-<a href="http://spf.pobox.com/srs.html">SRS</a> forgery detection,
-thread resource starvation detection.
-SRS support requires <a href="http://bmsi.com/python/pysrs.html">pysrs</a>.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.7-3.i386.rpm">
-milter-0.6.7-3.i386.rpm</a> Binary RPM for Redhat 7.x, now requires 
-	sendmail-8.12 and <a href="http://www.python.org/2.3.3/rpms.html">
-	python2.3</a>. 
-<br>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.7-3.src.rpm">
-milter-0.6.7-3.src.rpm</a> Source RPM for Redhat 7.x. 
-Release 0.6.7-3 patches:
-<ul>
-<li> Defang message/rfc822 content_type with boundary 
-<li> Support SPF delegation
-<li> Reject neutral SPF result for selected domains
-</ul>
-<p>
-<a href="http://bmsi.com/python/milter-0.6.6.tar.gz">
-milter-0.6.6.tar.gz</a> Plug another memory leak, 
-<a href="http://spf.pobox.com/">SPF</a> support, hello blacklist.
-SPF support requires <a href="http://pydns.sourceforge.net/">pydns</a>.
-NOTE - the spf.py module included is modified from the official 1.6
-version at <a href="http://www.wayforward.net/spf/">wayforward.net</a>.
-I neglected to add the CVS log.  The changes are expanded result codes
-and tolerating common method misspellings in SPF records.  I have notified the
-author, but haven't heard back.  At some point, the RPM will
-include the official pyspf tarball and apply patches.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.6-2.i386.rpm">
-milter-0.6.6-2.i386.rpm</a> Binary RPM for Redhat 7.x, now requires 
-	sendmail-8.12 and <a href="http://www.python.org/2.3.3/rpms.html">
-	python2.3</a>.  Release 2 fixes sysv init script bug for python2.3.
-<br>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.6-2.src.rpm">
-milter-0.6.6-2.src.rpm</a> Source RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/python/milter-0.6.5.tar.gz">
-milter-0.6.5.tar.gz</a> Plug memory leak, progress reporting, trusted relay.
-Redhat RPM now requires sendmail-8.12.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.5-2.i386.rpm">
-milter-0.6.5-2.i386.rpm</a> Binary RPM for Redhat 7.x
-<br>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.5-2.src.rpm">
-milter-0.6.5-2.src.rpm</a> Source RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/python/milter-0.6.4.tar.gz">
-milter-0.6.4.tar.gz</a> Numerous Dspam fixes.  Requires
-<a href="dspam.html">pydspam-1.1.5</a> and 
-<a href="/libdspam/dspam.html">dspam-2.6.5.2</a>
-for Dspam features.  The dspam-python RPM has been replaced by pydspam.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.4-1.i386.rpm">
-milter-0.6.4-1.i386.rpm</a> Binary RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/python/milter-0.6.3.1.tar.gz">
-milter-0.6.3.1.tar.gz</a> New dspam SCREENER feature with pydspam-1.1.4.
-Don't save a defang copy of false positives.  Fixed an oops from last fix,
-rejecting false positives.  BUG: sendmail-8.11 doesn't invoke milter
-when sending mail via sendmail from command line (8.12 works).  Therefore,
-the supplied falsepositive script for milter based dspam doesn't work
-with stock RedHat 7.x.  I am writing a HOWTO for configuring milter
-based dspam that will address this (and a fix in the next version).
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.3-1.i386.rpm">
-milter-0.6.3-1.i386.rpm</a> Binary RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/python/milter-0.6.2.tar.gz">
-milter-0.6.2.tar.gz</a> work around email.Message.get_filename bug,
-dspam_exempt list, REJECT messages with missing MIME boundaries (which
-are almost always spam),
-DISCARD messages which any dspam user flags as spam,
-start.sh was calling python instead of python2 on Linux.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.2-1.src.rpm">
-milter-0.6.2-1.src.rpm</a> Source RPM for Redhat 7.x (and likely
-higher versions)
-<p>
-<a href="http://bmsi.com/python/milter-0.6.1.tar.gz">
-milter-0.6.1.tar.gz</a> dspam milter application, python-2.2.3 support.
-<p>
-You must have <a href=dspam.html>dspam and dspam-python</a> loaded for
-the dspam feature to work.  Brief instructions for configuring are
-in the default config file.  This is working at a customer, but I'm
-sure a few more iterations will be required to make setup as smooth
-as possible.
-<p>
-NOTE: Outlook destroys dspam tags when forwarding mail (while converting
-HTML to text).  Perhaps some config option will turn this abominable
-"feature" off.  Working around this by making dspam tags visble on
-HTML mail is ugly.  My suggestion is to not use Outlook, for this and
-many other reasons - especially security.  Any other suggestions for
-those married to Microsoft are welcome.  The DSPAM LDA works around this
-by making the tags visible in HTML attachments.  This is ugly, and
-occasionally corrupts attachments.
-<p>
-We have to supply workarounds for bugs in the email module (reported
-to sourceforge).  The workarounds reference some internal variables
-which change with python versions.
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.1-1.i386.rpm">
-milter-0.6.1-1.i386.rpm</a> Binary RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.1-1.src.rpm">
-milter-0.6.1-1.src.rpm</a> Source RPM for Redhat 7.x (and likely
-higher versions)
-<p>
-<a href="http://bmsi.com/python/milter-0.6.0.tar.gz">
-milter-0.6.0.tar.gz</a> simple dspam pre-filtering, use email module,
-requires python &gt;= 2.2.2.  
-<ul>
-<li> The milter.so module from 0.5.4
-is needed to run this release on AIX.  Haven't tracked this down yet.
-<li> The patches to fix the email packages in mime.py don't work
-on python-2.2.3.  The email package is still broken in 2.3, and patches
-required for that will likely be different still.
-</ul>
-
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.0-1.i386.rpm">
-milter-0.6.0-1.i386.rpm</a> Binary RPM for Redhat 7.x
-<p>
-<a href="http://bmsi.com/linux/rh72/milter-0.6.0-1.src.rpm">
-milter-0.6.0-1.src.rpm</a> Source RPM for Redhat 7.x (and likely
-higher versions)
-<p>
-<a href="http://www.bmsi.com/python/milter-0.5.5.tar.gz">
-milter-0.5.5.tar.gz</a> IPV6 support, passing None to set_XXX_callback,
-set_reply, chg_header, detect internal connections.  Note, this release
-did not work on AIX4.1.5, probably due to IPV6 support breaking something.
-The milter.so module from 0.5.4 can be installed to use this release 
-with AIX.
-<p>
-<a href="http://www.bmsi.com/python/milter-0.5.4.tar.gz">
-milter-0.5.4.tar.gz</a> wiretap, smart alias features, quarantine support.
-<p>
-The name of the production "sample" milter "bms.py" now
-stands for "Basic Milter System" until someone suggests a better name.
-The test coverage is rather
-  sparse at present.  
-  Please <a href="mailto:%73%74%75%61%72%74%40%62%6D%73%69%2E%63%6F%6D">email</a> with proposals for what
-  to name the milter application.
-<h4>NOTES</h4>
-<ul>
-<li>
-  Quarantine support requires that you define _FFR_QUARANTINE 
-  when compiling miltermodule.c.  I am not sure how to make setup.py
-  do that for you iff sendmail was actually compiled with _FFR_QUARANTINE.
-<li>
-  While 0.6.0 will use the new email package in Python-2.2, that
-  package seems to be buggy in Python-2.2.1.  The list example in the docs
-  doesn't find all MIME parts.  Update: Python-2.2.2 has fixed the email
-  package.  It can now parse my test cases.
-<li>
-  Preliminary testing with python-2.2 shows that most things work after
-  adding <code>self.readahead = ""</code> to <code>mimepart.seek</code>.
-  Python-2.2 <code>multifile</code> reads one less newline per section than
-  2.1.  I'm not not sure which is correct.  After adding some calls to
-  <code>rstrip()</code> in testmime.py, all milter modules pass unit testing
-  with python-2.2.  Python-2.2 patches have been released since 0.5.3.
-<li>
-  sgmlop-1.1a3 has a memory leak (at least Python milter has a
-  memory leak when using sgmlop instead of sgmllib).  Do not make Python
-  milter use sgmlop-1.1a2 or a3 in a production
-  system unless you can restart your milter periodically.  The amount
-  of memory leaked seems roughly proportional to the amount of HTML
-  parsed.
-<li>
-  There are a number of ways that malformed MIME attachments
-  can cause a python traceback.  Uncaught exceptions cause a 415
-  error to be returned to sendmail.  So far, all the malformed messages
-  I've investigated have been SPAM - so good riddance.  I would prefer,
-  however, that the mime handling libraries were more precise.  Beginning
-  with 0.5.1, bms.py will save messages that cause a traceback during
-  scanning in the tempfile directory with a ".fail" extension.  This
-  makes it easier to get samples of mail that causes parsing problems
-  for incorporation into the unit tests.
-</ul>
-<p>
-<a href="http://www.bmsi.com/python/milter-0.5.2.tar.gz">
-milter-0.5.2.tar.gz</a> Fix and unittest another HTML parsing bug.<br>
-<a href="http://www.bmsi.com/python/milter-0.5.1.tar.gz">
-milter-0.5.1.tar.gz</a> Handle encoded rfc822 attachments.<br>
-<a href="http://www.bmsi.com/python/milter-0.5.0.tar.gz">
-milter-0.5.0.tar.gz</a> Use a config file so users don't have to
-keep syncing with bms.py.  <br>
-<a href="http://www.bmsi.com/python/milter-0.4.5.tar.gz">
-milter-0.4.5.tar.gz</a> Work with sgmlop. Reduce local hacks to config variables.
+Milter and spf modules, and the beginnings of a general purpose SPAM filtering,
+wiretapping, SPF checking, and Win32 virus protecting milter.  It can
+make use of the <a href="pysrs.html">pysrs</a> package when available for
+SRS/SES checking and the <a href="dspam.html">pydspam</a> package for Bayesian
+content filtering.  SPF checking
+requires <a href="http://pydns.sourceforge.net/">
+pydns</a>.  Configuration documentation is currently included as comments
+in the <a href="milter.cfg">sample config file</a> for the bms.py milter.
 <p>
 Python milter is under GPL.  The authors can probably be convinced to
-change this to LGPL.
+change this to LGPL if needed.
 
 <h3>What is a <a name="milter">milter</a>?</h3>
 
@@ -426,7 +290,7 @@ The "defang" function of the sample milter was inspired by
 a Perl milter with flexible attachment processing options.  The latest
 version of MIMEDefang uses an apache style process pool to avoid reloading
 the Perl interpreter for each message.  This makes it fast enough for
-production and does not use Perl threading.
+production without using Perl threading.
 <p>
 <a href="http://sourceforge.net/projects/mailchecker">mailchecker</a> is
 a Python project to provide flexible attachment processing for mail.  I
@@ -500,18 +364,10 @@ me if you successfully install milter on a system not mentioned below.
 <td>0.5.4</td><tr>
 <td>RedHat 7.1</td><td>gcc-2.96</td><td>?</td><td>8.12.1</td>
 <td>0.3.5</td><tr>
-<td>RedHat 7.2</td><td>gcc-2.96</td><td>2.1.1</td><td>8.11.6</td>
-<td>0.4.1</td><tr>
-<td>RedHat 7.2</td><td>gcc-2.96</td><td>2.2.1</td><td>8.11.6</td>
-<td>0.4.5</td><tr>
-<td>RedHat 7.2</td><td>gcc-2.96</td><td>2.2.2</td><td>8.11.6</td>
-<td>0.5.5</td><tr>
-<td>RedHat 7.2</td><td>gcc-2.96</td><td>2.3.3</td><td>8.12.10</td>
-<td>0.6.6</td><tr>
 <td>RedHat 7.3</td><td>gcc-2.96</td><td>2.2.2</td><td>8.11.6</td>
 <td>0.5.5</td><tr>
-<td>RedHat 7.3</td><td>gcc-2.96</td><td>2.3.3</td><td>8.12.10</td>
-<td>0.6.6</td><tr>
+<td>RedHat 7.3</td><td>gcc-2.96</td><td>2.3.3</td><td>8.13.1</td>
+<td>0.7.2</td><tr>
 <td>RedHat 8.0</td><td>gcc-3.2</td><td>2.2.1</td><td>8.12.6</td>
 <td>0.5.2</td><tr>
 <td>Debian Linux</td><td>gcc-2.95.2</td><td>2.1.1</td><td>8.12.0</td>
@@ -524,14 +380,14 @@ me if you successfully install milter on a system not mentioned below.
 <td>0.3.4</td><tr>
 <td>AIX-4.1.5</td><td>gcc-2.95.2</td><td>2.1.3</td><td>8.12.3</td>
 <td>0.4.2</td><tr>
-<td>AIX-4.1.5</td><td>gcc-2.95.2</td><td>2.2.2</td><td>8.12.6</td>
-<td>0.5.4</td><tr>
+<td>AIX-4.1.5</td><td>gcc-2.95.2</td><td>2.2.3</td><td>8.13.1</td>
+<td>0.7.1</td><tr>
 <td>Slackware 7.1</td><td>?</td><td>?</td><td>8.12.1</td>
 <td>0.3.8</td><tr>
 <td>Slackware 9.0</td><td>gcc-3.2.2</td><td>2.2.3</td><td>8.12.9</td>
 <td>0.5.4</td><tr>
-<td>OpenBSD</td><td>?</td><td>2.1.1</td><td>8.11.6</td>
-<td>0.3.9</td><tr>
+<td>OpenBSD</td><td>?</td><td>2.3.3?</td><td>8.13.1?</td>
+<td>0.7.2</td><tr>
 <td>SuSE 7.3</td><td>gcc-2.95.3</td><td>2.1.1</td><td>8.12.2</td>
 <td>0.3.9</td><tr>
 <td>FreeBSD</td><td>gcc-2.95.3</td><td>2.2.1</td><td>8.12.3</td>

milter.spec

@@ -1,12 +1,27 @@
 %define name milter
-%define version 0.7.0
-%define release 1
-# Redhat 7.x and earlier (multiple ps lines per thread)
+%define version 0.8.1
+%define release 1.RH7
+# what version of RH are we building for?
+%define redhat9 0
+%define redhat7 1
+%define redhat6 0
+
+# Options for Redhat version 6.x:
+# rpm -ba|--rebuild --define "rh6 1"
+%{?rh6:%define redhat7 0}
+%{?rh6:%define redhat6 1}
+
+# some systems dont have initrddir defined
+%{?_initrddir:%define _initrddir /etc/rc.d/init.d}
+
+%if %{redhat9}
+%define sysvinit milter.rc
+%else	# Redhat 7.x and earlier (multiple ps lines per thread)
 %define sysvinit milter.rc7
+%endif
 # RH9, other systems (single ps line per process)
-#define sysvinit milter.rc
 %ifos Linux
-%define python python2.3
+%define python python2.4
 %else
 %define python python
 %endif
@@ -24,8 +39,11 @@ Prefix: %{_prefix}
 Vendor: Stuart D. Gathman <stuart@bmsi.com>
 Packager: Stuart D. Gathman <stuart@bmsi.com>
 Url: http://www.bmsi.com/python/milter.html
-Requires: %{python} >= 2.2.2, sendmail >= 8.12
-BuildRequires: %{python}-devel >= 2.2.2, sendmail-devel >= 8.12
+Requires: %{python} >= 2.4, sendmail >= 8.12.10
+%ifos Linux
+Requires: chkconfig
+%endif
+BuildRequires: %{python}-devel , sendmail-devel >= 8.12.10
 
 %description
 This is a python extension module to enable python scripts to
@@ -45,7 +63,7 @@ rm -rf $RPM_BUILD_ROOT
 mkdir -p $RPM_BUILD_ROOT/var/log/milter
 mkdir -p $RPM_BUILD_ROOT/etc/mail
 mkdir $RPM_BUILD_ROOT/var/log/milter/save
-cp bms.py $RPM_BUILD_ROOT/var/log/milter
+cp bms.py strike3.txt softfail.txt $RPM_BUILD_ROOT/var/log/milter
 cp milter.cfg $RPM_BUILD_ROOT/etc/mail/pymilter.cfg
 
 # logfile rotation
@@ -59,10 +77,15 @@ EOF
 
 # purge saved defanged message copies
 mkdir -p $RPM_BUILD_ROOT/etc/cron.daily
+%ifos aix4.1
+R=
+%else
+R='-r'
+%endif
 cat >$RPM_BUILD_ROOT/etc/cron.daily/milter <<'EOF'
 #!/bin/sh
 
-find /var/log/milter/save -mtime +7 | xargs -r rm
+find /var/log/milter/save -mtime +7 | xargs $R rm
 EOF
 chmod a+x $RPM_BUILD_ROOT/etc/cron.daily/milter
 
@@ -96,6 +119,8 @@ EOF
 chmod a+x $RPM_BUILD_ROOT/var/log/milter/start.sh
 
 mkdir -p $RPM_BUILD_ROOT/var/run/milter
+mkdir -p $RPM_BUILD_ROOT/usr/share/sendmail-cf/hack
+cp -p rhsbl.m4 $RPM_BUILD_ROOT/usr/share/sendmail-cf/hack
 
 %ifos aix4.1
 %post
@@ -107,7 +132,13 @@ if [ $1 = 0 ]; then
 fi
 %else
 %post
-echo "pythonsock has moved to /var/run/milter, update /etc/mail/sendmail.cf"
+#echo "pythonsock has moved to /var/run/milter, update /etc/mail/sendmail.cf"
+/sbin/chkconfig --add milter
+
+%preun
+if [ $1 = 0 ]; then
+  /sbin/chkconfig --del milter
+fi
 %endif
 
 %clean
@@ -129,9 +160,45 @@ rm -rf $RPM_BUILD_ROOT
 %dir /var/log/milter/save
 %config /var/log/milter/start.sh
 %config /var/log/milter/bms.py
+%config /var/log/milter/strike3.txt
+%config /var/log/milter/softfail.txt
 %config(noreplace) /etc/mail/pymilter.cfg
+/usr/share/sendmail-cf/hack/rhsbl.m4
 
 %changelog
+* Thu Jun 16 2005 Stuart Gathman <stuart@bmsi.com> 0.8.1-1
+- Fix zip in zip loop in mime.py
+- Fix HeaderParseError in bms.py header callback
+- Check internal_domains for outgoing mail
+- Fix inconsistent results from send_dsn
+* Mon Jun 06 2005 Stuart Gathman <stuart@bmsi.com> 0.8.0-3
+- properly log pydspam exceptions
+* Sat Jun 04 2005 Stuart Gathman <stuart@bmsi.com> 0.8.0-2
+- Include default softfail, strike3 templates
+* Wed May 25 2005 Stuart Gathman <stuart@bmsi.com> 0.8.0-1
+- Move Milter module to subpackage.
+- DSN support for Three strikes rule and SPF SOFTFAIL
+- Move /*mime*/ and dynip to Milter subpackage
+- Fix SPF unknown mechanism list not cleared
+- Make banned extensions configurable.
+- Option to scan zipfiles for bad extensions.
+* Tue Feb 08 2005 Stuart Gathman <stuart@bmsi.com> 0.7.3-1.EL3
+- Support EL3 and Python2.4 (some scanning/defang support broken)
+* Mon Aug 30 2004 Stuart Gathman <stuart@bmsi.com> 0.7.2-1
+- Fix various SPF bugs
+- Recognize dynamic PTR names, and don't count them as authentication.
+- Three strikes and yer out rule.
+- Block softfail by default unless valid PTR or HELO
+- Return unknown for null mechanism
+- Return unknown for invalid ip address in mechanism
+- Try best guess on HELO also
+- Expand setreply for common errors
+- make rhsbl.m4 hack available for sendmail.mc
+* Sun Aug 22 2004 Stuart Gathman <stuart@bmsi.com> 0.7.1-1
+- Handle modifying mislabeled multipart messages without an exception
+- Support setbacklog, setmlreply
+- allow multi-recipient CBV
+- return TEMPFAIL for SPF softfail
 * Fri Jul 23 2004 Stuart Gathman <stuart@bmsi.com> 0.7.0-1
 - SPF check hello name
 - Move pythonsock to /var/run/milter

miltermodule.c

@@ -1,4 +1,5 @@
 /* Copyright (C) 2001  James Niemira (niemira@colltech.com, urmane@urmane.org)
+ * Portions Copyright (C) 2001,2002,2003,2004  Stuart Gathman (stuart@bmsi.com)
  * 
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -33,6 +34,21 @@ $ python setup.py help
      libraries=["milter","smutil","resolv"]
 
  * $Log$
+ * Revision 1.1.1.2  2005/05/31 18:09:06  customdesigned
+ * Release 0.7.1
+ *
+ * Revision 2.31  2004/08/23 02:24:36  stuart
+ * Support setbacklog
+ *
+ * Revision 2.30  2004/08/21 20:29:53  stuart
+ * Support option of 11 lines max for mlreply.
+ *
+ * Revision 2.29  2004/08/21 04:14:29  stuart
+ * mlreply support
+ *
+ * Revision 2.28  2004/08/21 02:45:21  stuart
+ * Don't leak int constants if module unloaded.
+ *
  * Revision 2.27  2004/04/06 03:19:59  stuart
  * Release 0.6.8
  *
@@ -127,11 +143,20 @@ $ python setup.py help
  *
  */
 
+#ifndef MAX_ML_REPLY
+#define MAX_ML_REPLY 32
+#endif
+#if MAX_ML_REPLY != 1 && MAX_ML_REPLY != 32 && MAX_ML_REPLY != 11
+#error MAX_ML_REPLY must be 1 or 11 or 32
+#endif
+#define _FFR_MULTILINE (MAX_ML_REPLY > 1)
+
 #include <pthread.h>
 #include <netinet/in.h>
 #include <Python.h>
 #include <libmilter/mfapi.h>
 
+
 /* See if we have IPv4 and/or IPv6 support in this OS and in
  * libmilter.  We need to make several macro tests because some OS's
  * may define some if IPv6 is only partially supported, and we may
@@ -746,6 +771,18 @@ milter_setdbg(PyObject *self, PyObject *args) {
   return _generic_return(smfi_setdbg(val), "cannot set debug value");
 }
 
+static char milter_setbacklog__doc__[] =
+"setbacklog(int) -> None\n\
+Set the TCP connection queue size for the milter socket.";
+
+static PyObject *
+milter_setbacklog(PyObject *self, PyObject *args) {
+   int val;
+
+   if (!PyArg_ParseTuple(args, "i:setbacklog", &val)) return NULL;
+   return _generic_return(smfi_setbacklog(val), "cannot set backlog");
+}
+
 static char milter_settimeout__doc__[] =
 "settimeout(int) -> None\n\
 Set the time (in seconds) that sendmail will wait before\n\
@@ -820,13 +857,54 @@ static PyObject *
 milter_setreply(PyObject *self, PyObject *args) {
   char *rcode;
   char *xcode;
-  char *message;
+  char *message[MAX_ML_REPLY];
+  char fmt[MAX_ML_REPLY + 16];
   SMFICTX *ctx;
-  if (!PyArg_ParseTuple(args, "szz:setreply", &rcode, &xcode, &message))
+  int i;
+  strcpy(fmt,"sz|");
+  for (i = 0; i < MAX_ML_REPLY; ++i) {
+    message[i] = 0;
+    fmt[i+3] = 's';
+  }
+  strcpy(fmt+i+3,":setreply");
+  if (!PyArg_ParseTuple(args, fmt,
+	&rcode, &xcode, message
+#if MAX_ML_REPLY > 1
+	,message+1,message+2,message+3,message+4,message+5,message+6,
+	message+7,message+8,message+9,message+10
+#if MAX_ML_REPLY > 11
+	,message+11,message+12,message+13,message+14,message+15,
+	message+16,message+17,message+18,message+19,message+20,
+	message+21,message+22,message+23,message+24,message+25,
+	message+26,message+27,message+28,message+29,message+30,
+	message+31
+#endif
+#endif
+  ))
     return NULL;
   ctx = _find_context(self);
   if (ctx == NULL) return NULL;
-  return _generic_return(smfi_setreply(ctx, rcode, xcode, message),
+#if MAX_ML_REPLY > 1
+  /*
+   * C varargs might be convenient for some things, but they sure are a pain
+   * when the number of args is not known at compile time.
+   */
+  if (message[0] && message[1])
+    return _generic_return(smfi_setmlreply(ctx, rcode, xcode,
+	  message[0],
+	  message[1],message[2],message[3],message[4],message[5],
+	  message[6],message[7],message[8],message[9],message[10],
+#if MAX_ML_REPLY > 11
+	  message[11],message[12],message[13],message[14],message[15],
+	  message[16],message[17],message[18],message[19],message[20],
+	  message[21],message[22],message[23],message[24],message[25],
+	  message[26],message[27],message[28],message[29],message[30],
+	  message[31],
+#endif
+	  (char *)0
+    ), "cannot set reply");
+#endif
+  return _generic_return(smfi_setreply(ctx, rcode, xcode, message[0]),
 			 "cannot set reply");
 }
 
@@ -986,7 +1064,7 @@ milter_getpriv(PyObject *self, PyObject *args) {
   return o;
 }
 
-#if _FFR_QUARANTINE
+#ifdef SMFIF_QUARANTINE
 static char milter_quarantine__doc__[] =
 "quarantine(string) -> None\n\
 Place the message in quarantine.  A string with a description of the reason\n\
@@ -1035,7 +1113,7 @@ static PyMethodDef context_methods[] = {
   { "replacebody", milter_replacebody, METH_VARARGS, milter_replacebody__doc__},
   { "setpriv",     milter_setpriv,     METH_VARARGS, milter_setpriv__doc__},
   { "getpriv",     milter_getpriv,     METH_VARARGS, milter_getpriv__doc__},
-#if _FFR_QUARANTINE
+#ifdef SMFIF_QUARANTINE
   { "quarantine",  milter_quarantine,  METH_VARARGS, milter_quarantine__doc__},
 #endif
 #if _FFR_SMFI_PROGRESS
@@ -1081,6 +1159,7 @@ static PyMethodDef milter_methods[] = {
    { "main",                 milter_main,                 METH_VARARGS, milter_main__doc__},
    { "setdbg",               milter_setdbg,               METH_VARARGS, milter_setdbg__doc__},
    { "settimeout",           milter_settimeout,           METH_VARARGS, milter_settimeout__doc__},
+   { "setbacklog",           milter_setbacklog,           METH_VARARGS, milter_setbacklog__doc__},
    { "setconn",              milter_setconn,              METH_VARARGS, milter_setconn__doc__},
    { "stop",                 milter_stop,                 METH_VARARGS, milter_stop__doc__},
    { NULL, NULL }
@@ -1116,6 +1195,12 @@ allowing one to write email filters directly in Python.\n\
 Libmilter is currently marked FFR, and needs to be explicitly installed.\n\
 See <sendmailsource>/libmilter/README for details on setting it up.\n";
 
+static void setitem(PyObject *d,const char *name,long val) {
+  PyObject *v = PyInt_FromLong(val);
+  PyDict_SetItemString(d,name,v);
+  Py_DECREF(v);
+}
+
 void
 initmilter(void) {
    PyObject *m, *d;
@@ -1125,24 +1210,24 @@ initmilter(void) {
    d = PyModule_GetDict(m);
    MilterError = PyErr_NewException("milter.error", NULL, NULL);
    PyDict_SetItemString(d,"error", MilterError);
-   PyDict_SetItemString(d,"SUCCESS", PyInt_FromLong((long) MI_SUCCESS));
-   PyDict_SetItemString(d,"FAILURE", PyInt_FromLong((long) MI_FAILURE));
-   PyDict_SetItemString(d,"VERSION", PyInt_FromLong((long) SMFI_VERSION));
-   PyDict_SetItemString(d,"ADDHDRS", PyInt_FromLong((long) SMFIF_ADDHDRS));
-   PyDict_SetItemString(d,"CHGBODY", PyInt_FromLong((long) SMFIF_CHGBODY));
-   PyDict_SetItemString(d,"MODBODY", PyInt_FromLong((long) SMFIF_MODBODY));
-   PyDict_SetItemString(d,"ADDRCPT", PyInt_FromLong((long) SMFIF_ADDRCPT));
-   PyDict_SetItemString(d,"DELRCPT", PyInt_FromLong((long) SMFIF_DELRCPT));
-   PyDict_SetItemString(d,"CHGHDRS", PyInt_FromLong((long) SMFIF_CHGHDRS));
-   PyDict_SetItemString(d,"V1_ACTS", PyInt_FromLong((long) SMFI_V1_ACTS));
-   PyDict_SetItemString(d,"V2_ACTS", PyInt_FromLong((long) SMFI_V2_ACTS));
-   PyDict_SetItemString(d,"CURR_ACTS", PyInt_FromLong((long) SMFI_CURR_ACTS));
+   setitem(d,"SUCCESS",  MI_SUCCESS);
+   setitem(d,"FAILURE",  MI_FAILURE);
+   setitem(d,"VERSION",  SMFI_VERSION);
+   setitem(d,"ADDHDRS",  SMFIF_ADDHDRS);
+   setitem(d,"CHGBODY",  SMFIF_CHGBODY);
+   setitem(d,"MODBODY",  SMFIF_MODBODY);
+   setitem(d,"ADDRCPT",  SMFIF_ADDRCPT);
+   setitem(d,"DELRCPT",  SMFIF_DELRCPT);
+   setitem(d,"CHGHDRS",  SMFIF_CHGHDRS);
+   setitem(d,"V1_ACTS",  SMFI_V1_ACTS);
+   setitem(d,"V2_ACTS",  SMFI_V2_ACTS);
+   setitem(d,"CURR_ACTS",  SMFI_CURR_ACTS);
 #ifdef SMFIF_QUARANTINE
-   PyDict_SetItemString(d,"QUARANTINE",PyInt_FromLong((long)SMFIF_QUARANTINE));
+   setitem(d,"QUARANTINE",SMFIF_QUARANTINE);
 #endif
-   PyDict_SetItemString(d,"CONTINUE", PyInt_FromLong((long) SMFIS_CONTINUE));
-   PyDict_SetItemString(d,"REJECT", PyInt_FromLong((long) SMFIS_REJECT));
-   PyDict_SetItemString(d,"DISCARD", PyInt_FromLong((long) SMFIS_DISCARD));
-   PyDict_SetItemString(d,"ACCEPT", PyInt_FromLong((long) SMFIS_ACCEPT));
-   PyDict_SetItemString(d,"TEMPFAIL", PyInt_FromLong((long) SMFIS_TEMPFAIL));
+   setitem(d,"CONTINUE",  SMFIS_CONTINUE);
+   setitem(d,"REJECT",  SMFIS_REJECT);
+   setitem(d,"DISCARD",  SMFIS_DISCARD);
+   setitem(d,"ACCEPT",  SMFIS_ACCEPT);
+   setitem(d,"TEMPFAIL",  SMFIS_TEMPFAIL);
 }

mime.py

@@ -1,4 +1,41 @@
 # $Log$
+# Revision 1.3  2005/06/02 15:00:17  customdesigned
+# Configure banned extensions.  Scan zipfile option with test case.
+#
+# Revision 1.2  2005/06/02 04:18:55  customdesigned
+# Update copyright notices after reading article on /.
+#
+# Revision 1.1.1.4  2005/05/31 18:23:49  customdesigned
+# Development changes since 0.7.2
+#
+# Revision 1.62  2005/02/14 22:31:17  stuart
+# _parseparam replacement not needed for python2.4
+#
+# Revision 1.61  2005/02/12 02:11:11  stuart
+# Pass unit tests with python2.4.
+#
+# Revision 1.60  2005/02/11 18:34:14  stuart
+# Handle garbage after quote in boundary.
+#
+# Revision 1.59  2005/02/10 01:10:59  stuart
+# Fixed MimeMessage.ismodified()
+#
+# Revision 1.58  2005/02/10 00:56:49  stuart
+# Runs with python2.4.  Defang not working correctly - more work needed.
+#
+# Revision 1.57  2004/11/20 16:37:52  stuart
+# fix regex for splitting header and body
+#
+# Revision 1.56  2004/11/09 20:33:51  stuart
+# Recognize more dynamic PTR variations.
+#
+# Revision 1.55  2004/10/06 21:39:20  stuart
+# Handle message attachments with boundary errors by not parsing them
+# until needed.
+#
+# Revision 1.54  2004/08/18 01:59:46  stuart
+# Handle mislabeled multipart messages
+#
 # Revision 1.53  2004/04/24 22:53:20  stuart
 # Rename some local variables to avoid shadowing builtins
 #
@@ -34,169 +71,46 @@
 # with a warning message.
 
 # Author: Stuart D. Gathman <stuart@bmsi.com>
-# Copyright 2001 Business Management Systems, Inc.
-# This code is under GPL.  See COPYING for details.
+# Copyright 2001,2002,2003,2004,2005 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
 
 import StringIO
 import socket
 import Milter
+import zipfile
+
 import email
 import email.Message
 from email.Message import Message
 from email.Generator import Generator
 from email.Utils import quote
 from email import Utils
+from email.Parser import Parser
+from email import Errors
 
 from types import ListType,StringType
 
-# Enhance email.Parser
-# - Fix _parsebody to decode message attachments before parsing
+def zipnames(txt):
+  fp =  StringIO.StringIO(txt)
+  zipf = zipfile.ZipFile(fp,'r')
+  names = []
+  for nm in zipf.namelist():
+    names.append(('zipname',nm))
+    if nm.lower().endswith('.zip'):
+      names += zipnames(zipf.read(nm))
+  return names
 
-from email.Parser import Parser
-try: from email.Parser import NLCRE
-except: from email.Parser import nlcre as NLCRE
-
-from email import Errors
-
-class MimeParser(Parser):
-
-    # This is a copy of _parsebody from email.Parser, with a fix
-    # for message attachments.  I couldn't find a smaller way to patch it
-    # in a subclass.
-
-    def _parsebody(self, container, fp, firstbodyline=None):
-        # Parse the body, but first split the payload on the content-type
-        # boundary if present.
-        boundary = container.get_boundary()
-        isdigest = (container.get_content_type() == 'multipart/digest')
-        # If there's a boundary, split the payload text into its constituent
-        # parts and parse each separately.  Otherwise, just parse the rest of
-        # the body as a single message.  Note: any exceptions raised in the
-        # recursive parse need to have their line numbers coerced.
-        if boundary:
-            preamble = epilogue = None
-            # Split into subparts.  The first boundary we're looking for won't
-            # always have a leading newline since we're at the start of the
-            # body text, and there's not always a preamble before the first
-            # boundary.
-            separator = '--' + boundary
-            payload = fp.read()
-            if firstbodyline is not None:
-                payload = firstbodyline + '\n' + payload
-            # We use an RE here because boundaries can have trailing
-            # whitespace.
-            mo = re.search(
-                r'(?P<sep>' + re.escape(separator) + r')(?P<ws>[ \t]*)',
-                payload)
-            if not mo:
-                if self._strict:
-                    raise Errors.BoundaryError(
-                        "Couldn't find starting boundary: %s" % boundary)
-                container.set_payload(payload)
-                return
-            start = mo.start()
-            if start > 0:
-                # there's some pre-MIME boundary preamble
-                preamble = payload[0:start]
-            # Find out what kind of line endings we're using
-            start += len(mo.group('sep')) + len(mo.group('ws'))
-            mo = NLCRE.search(payload, start)
-            if mo:
-                start += len(mo.group(0))
-            # We create a compiled regexp first because we need to be able to
-            # specify the start position, and the module function doesn't
-            # support this signature. :(
-            cre = re.compile('(?P<sep>\r\n|\r|\n)' +
-                             re.escape(separator) + '--')
-            mo = cre.search(payload, start)
-            if mo:
-                terminator = mo.start()
-                linesep = mo.group('sep')
-                if mo.end() < len(payload):
-                    # There's some post-MIME boundary epilogue
-                    epilogue = payload[mo.end():]
-            elif self._strict:
-                raise Errors.BoundaryError(
-                        "Couldn't find terminating boundary: %s" % boundary)
-            else:
-                # Handle the case of no trailing boundary.  Check that it ends
-                # in a blank line.  Some cases (spamspamspam) don't even have
-                # that!
-                mo = re.search('(?P<sep>\r\n|\r|\n){2}$', payload)
-                if not mo:
-                    mo = re.search('(?P<sep>\r\n|\r|\n)$', payload)
-                    if not mo:
-                        raise Errors.BoundaryError(
-                          'No terminating boundary and no trailing empty line')
-                linesep = mo.group('sep')
-                terminator = len(payload)
-            # We split the textual payload on the boundary separator, which
-            # includes the trailing newline. If the container is a
-            # multipart/digest then the subparts are by default message/rfc822
-            # instead of text/plain.  In that case, they'll have a optional
-            # block of MIME headers, then an empty line followed by the
-            # message headers.
-            parts = re.split(
-                linesep + re.escape(separator) + r'[ \t]*' + linesep,
-                payload[start:terminator])
-            for part in parts:
-                if isdigest:
-                    if part.startswith(linesep):
-                        # There's no header block so create an empty message
-                        # object as the container, and lop off the newline so
-                        # we can parse the sub-subobject
-                        msgobj = self._class()
-                        part = part[len(linesep):]
-                    else:
-                        parthdrs, part = part.split(linesep+linesep, 1)
-                        # msgobj in this case is the "message/rfc822" container
-                        msgobj = self.parsestr(parthdrs, headersonly=1)
-                    # while submsgobj is the message itself
-                    msgobj.set_default_type('message/rfc822')
-                    maintype = msgobj.get_content_maintype()
-                    if maintype in ('message', 'multipart'):
-                        submsgobj = self.parsestr(part)
-                        msgobj.attach(submsgobj)
-                    else:
-                        msgobj.set_payload(part)
-                else:
-                    msgobj = self.parsestr(part)
-                container.preamble = preamble
-                container.epilogue = epilogue
-                container.attach(msgobj)
-        elif container.get_main_type() == 'multipart':
-            # Very bad.  A message is a multipart with no boundary!
-            raise Errors.BoundaryError(
-                'multipart message with no defined boundary')
-        elif container.get_type() == 'message/delivery-status':
-            # This special kind of type contains blocks of headers separated
-            # by a blank line.  We'll represent each header block as a
-            # separate Message object
-            blocks = []
-            while True:
-                blockmsg = self._class()
-                self._parseheaders(blockmsg, fp)
-                if not len(blockmsg):
-                    # No more header blocks left
-                    break
-                blocks.append(blockmsg)
-            container.set_payload(blocks)
-        elif container.get_main_type() == 'message':
-            # Create a container for the payload, but watch out for there not
-            # being any headers left
-            container.set_payload(fp.read())
-	    fp = StringIO.StringIO(container.get_payload(decode=True))
-            try:
-                msg = self.parse(fp)
-            except Errors.HeaderParseError:
-                msg = self._class()
-                self._parsebody(msg, fp)
-            container.set_payload([msg])
-        else:
-            text = fp.read()
-            if firstbodyline is not None:
-                text = firstbodyline + '\n' + text
-            container.set_payload(text)
+class MimeGenerator(Generator):
+    def _dispatch(self, msg):
+        # Get the Content-Type: for the message, then try to dispatch to
+        # self._handle_<maintype>_<subtype>().  If there's no handler for the
+        # full MIME type, then dispatch to self._handle_<maintype>().  If
+        # that's missing too, then dispatch to self._writeBody().
+        main = msg.get_content_maintype()
+	if msg.is_multipart() and main.lower() != 'multipart':
+	  self._handle_multipart(msg)
+	else:
+	  Generator._dispatch(self,msg)
 
 def unquote(s):
     """Remove quotes from a string."""
@@ -206,10 +120,11 @@ def unquote(s):
             s = s[1:-1]
 	  else: # remove garbage after trailing quote
 	    try: s = s[1:s[1:].index('"')+1]
-	    except: return s
+	    except:
+	      return s
 	  return s.replace('\\\\', '\\').replace('\\"', '"')
         if s.startswith('<') and s.endswith('>'):
-            return s[1:-1]
+	  return s[1:-1]
     return s
 
 from types import TupleType
@@ -220,27 +135,11 @@ def _unquotevalue(value):
   else:
       return unquote(value)
 
-email.Message._unquotevalue = _unquotevalue
+#email.Message._unquotevalue = _unquotevalue
 
-def _parseparam(s):
-    plist = []
-    while s[:1] == ';':
-	s = s[1:]
-	end = s.find(';')
-	while end > 0 and (s.count('"',0,end) & 1):
-	  end = s.find(';',end + 1)
-	if end < 0: end = len(s)
-	f = s[:end]
-	if '=' in f:
-	    i = f.index('=')
-	    f = f[:i].strip().lower() + \
-		    '=' + f[i+1:].strip()
-	plist.append(f.strip())
-	s = s[end:]
-    return plist
+from email.Message import _parseparam
 
 # Enhance email.Message 
-# - Fix getparam to parse attributes IE style
 # - Provide a headerchange event for integration with Milter
 #   Headerchange attribute can be assigned a function to be called when
 #   changing headers.  The signature is:
@@ -251,64 +150,19 @@ class MimeMessage(Message):
   """Version of email.Message.Message compatible with old mime module
   """
   def __init__(self,fp=None,seekable=1):
+    Message.__init__(self)
     self.headerchange = None
     self.submsg = None
-    Message.__init__(self)
-    self.fp = fp
-    if fp:
-      parser = MimeParser(MimeMessage)
-      self.startofheaders = fp.tell()
-      parser._parseheaders(self,fp)
-      self.startofbody = fp.tell()
-      parser._parsebody(self,fp)
-    for part in self.walk():
-      part.modified = False
+    self.modified = False
 
-  def rewindbody(self):
-    return self.fp.seek(self.startofbody)
+  def get_param(self, param, failobj=None, header='content-type', unquote=True):
+    val = Message.get_param(self,param,failobj,header,unquote)
+    if val != failobj and param == 'boundary' and unquote:
+      # unquote boundaries an extra time, test case testDefang5
+      return _unquotevalue(val)
+    return val
 
-  # override param parsing to handle quotes
-  def _get_params_preserve(self,failobj=None,header='content-type'):
-    "Return all parameter names and values. Use parser that handles quotes."
-    missing = []
-    value = self.get(header, missing)
-    if value is missing:
-	return failobj
-    params = []
-    for p in _parseparam(';' + value):
-	  try:
-	      name, val = p.split('=', 1)
-	      name = name.strip()
-	      val = val.strip()
-	  except ValueError:
-	      # Must have been a bare attribute
-	      name = p.strip()
-	      val = ''
-	  params.append((name, val))
-    params = Utils.decode_params(params)
-    return params
-
-  def get_filename(self, failobj=None):
-      """Return the filename associated with the payload if present.
-
-      The filename is extracted from the Content-Disposition header's
-      `filename' parameter, and it is unquoted.
-      """
-      missing = []
-      filename = self.get_param('filename', missing, 'content-disposition')
-      if filename is missing:
-	  return failobj
-      if isinstance(filename, TupleType):
-	  # It's an RFC 2231 encoded parameter
-	  newvalue = _unquotevalue(filename)
-	  if newvalue[0]:
-	    return unicode(newvalue[2], newvalue[0])
-	  return unicode(newvalue[2])
-      else:
-	  newvalue = _unquotevalue(filename.strip())
-	  return newvalue
-
-  getfilename = get_filename
+  getfilename = Message.get_filename
   ismultipart = Message.is_multipart
   getheaders = Message.get_all
   gettype = Message.get_content_type
@@ -319,11 +173,11 @@ class MimeMessage(Message):
   def getname(self):
     return self.get_param('name')
 
-  def getnames(self):
+  def getnames(self,scan_zip=False):
     """Return a list of (attr,name) pairs of attributes that IE might
        interpret as a name - and hence decide to execute this message."""
     names = []
-    for attr,val in self.get_params([]):
+    for attr,val in self._get_params_preserve([],'content-type'):
       if isinstance(val, TupleType):
 	  # It's an RFC 2231 encoded parameter
 	  newvalue = _unquotevalue(val)
@@ -334,12 +188,18 @@ class MimeMessage(Message):
       else:
 	  val = _unquotevalue(val.strip())
       names.append((attr,val))
-    return names + [("filename",self.get_filename())]
+    names += [("filename",self.get_filename())]
+    if scan_zip:
+      for key,name in tuple(names):	# copy by converting to tuple
+	if name and name.lower().endswith('.zip'):
+	  txt = self.get_payload(decode=True)
+	  names += zipnames(txt)
+    return names
 
   def ismodified(self):
     "True if this message or a subpart has been modified."
     if not self.is_multipart():
-      if self.submsg:
+      if isinstance(self.submsg,Message):
         return self.submsg.ismodified()
       return self.modified
     if self.modified: return True
@@ -349,9 +209,15 @@ class MimeMessage(Message):
 
   def dump(self,file,unixfrom=False):
     "Write this message (and all subparts) to a file"
-    g = Generator(file)
+    g = MimeGenerator(file)
     g.flatten(self,unixfrom=unixfrom)
 
+  def as_string(self, unixfrom=False):
+      "Return the entire formatted message as a string."
+      fp = StringIO.StringIO()
+      self.dump(fp,unixfrom=unixfrom)
+      return fp.getvalue()
+
   def getencoding(self):
     return self.get('content-transfer-encoding',None)
 
@@ -380,7 +246,7 @@ class MimeMessage(Message):
 
   def get_payload(self,i=None,decode=False):
     msg = self.submsg
-    if msg and msg.ismodified():
+    if isinstance(msg,Message) and msg.ismodified():
       self.set_payload([msg])
     return Message.get_payload(self,i,decode)
 
@@ -394,18 +260,27 @@ class MimeMessage(Message):
     self.submsg = None
 
   def get_submsg(self):
-    if self.get_content_type().lower() == 'message/rfc822':
+    t = self.get_content_type().lower()
+    if t == 'message/rfc822' or t.startswith('multipart/'):
       if not self.submsg:
         txt = self.get_payload()
 	if type(txt) == str:
 	  txt = self.get_payload(decode=True)
-	  parser = MimeParser(MimeMessage)
-	  self.submsg = parser.parsestr(txt)
+	  self.submsg = email.message_from_string(txt,MimeMessage)
+	  for part in self.submsg.walk():
+	    part.modified = False
 	else:
 	  self.submsg = txt[0]
       return self.submsg
     return None
 
+def message_from_file(fp):
+  msg = email.message_from_file(fp,MimeMessage)
+  for part in msg.walk():
+    part.modified = False
+  assert not msg.ismodified()
+  return msg
+
 extlist = ''.join("""
 ade,adp,asd,asx,asp,bas,bat,chm,cmd,com,cpl,crt,dll,exe,hlp,hta,inf,ins,isp,js,
 jse,lnk,mdb,mde,msc,msi,msp,mst,ocx,pcd,pif,reg,scr,sct,shs,url,vb,vbe,vbs,wsc,
@@ -427,12 +302,14 @@ A copy of your original message was saved as '%s:%s'.
 See your administrator.
 """
 
-def check_name(msg,savname=None,ckname=check_ext):
+def check_name(msg,savname=None,ckname=check_ext,scan_zip=False):
   "Replace attachment with a warning if its name is suspicious."
-  for key,name in msg.getnames():
+  for key,name in msg.getnames(scan_zip):
     badname = ckname(name)
     if badname:
       hostname = socket.gethostname()
+      if key == 'zipname':
+        badname = msg.get_filename()
       msg.set_payload(virus_msg % (badname,hostname,savname))
       del msg["content-type"]
       del msg["content-disposition"]
@@ -450,7 +327,7 @@ msg	MimeMessage
 check	function(MimeMessage): int
 	Return CONTINUE, REJECT, ACCEPT
   """
-  if msg.ismultipart() and not msg.get_content_type() == 'message/rfc822':
+  if msg.is_multipart():
     for i in msg.get_payload():
       rc = check_attachments(i,check)
       if rc != Milter.CONTINUE: return rc
@@ -459,28 +336,35 @@ check	function(MimeMessage): int
 
 # save call context for Python without nested_scopes
 class _defang:
-  def __init__(self,savname,check):
-    self._savname = savname
-    self._check = check
-    self.scan_rfc822 = True
-    self.scan_html = True
+
+  def __init__(self,scan_html=True):
+    self.scan_html = scan_html
+
   def _chk_name(self,msg):
-    rc = check_name(msg,self._savname,self._check)
+    rc = check_name(msg,self._savname,self._check,self.scan_zip)
     if self.scan_html:
       check_html(msg,self._savname)	# remove scripts from HTML
     if self.scan_rfc822:
       msg = msg.get_submsg()
-      if msg: return check_attachments(msg,self._chk_name)
+      if isinstance(msg,Message):
+        return check_attachments(msg,self._chk_name)
     return rc
 
+  def __call__(self,msg,savname=None,check=check_ext,scan_rfc822=True,
+  		scan_zip=False):
+    """Compatible entry point.
+    Replace all attachments with dangerous names."""
+    self._savname = savname
+    self._check = check
+    self.scan_rfc822 = scan_rfc822
+    self.scan_zip = scan_zip
+    check_attachments(msg,self._chk_name)
+    if msg.ismodified():
+      return True
+    return False
+
 # emulate old defang function
-def defang(msg,savname=None,check=check_ext):
-  """Compatible entry point.
-Replace all attachments with dangerous names."""
-  check_attachments(msg,_defang(savname,check)._chk_name)
-  if msg.ismodified():
-    return 1;
-  return 0
+defang = _defang()
 
 import sgmllib
 
@@ -577,7 +461,6 @@ class HTMLScriptFilter(SGMLFilter):
   def handle_comment(self,comment):
     if not self.ignoring: SGMLFilter.handle_comment(self,comment)
 
-
 def check_html(msg,savname=None):
   "Remove scripts from HTML attachments."
   msgtype = msg.get_content_type().lower()
@@ -611,3 +494,20 @@ def check_html(msg,savname=None):
       del msg["content-transfer-encoding"]
       email.Encoders.encode_quopri(msg)
   return Milter.CONTINUE
+
+if __name__ == '__main__':
+  import sys
+  def _list_attach(msg):
+    t = msg.get_content_type()
+    p = msg.get_payload(decode=True)
+    print msg.get_filename(),msg.get_content_type(),type(p)
+    msg = msg.get_submsg()
+    if isinstance(msg,Message):
+      return check_attachments(msg,_list_attach)
+    return Milter.CONTINUE
+
+  for fname in sys.argv[1:]:
+    fp = open(fname)
+    msg = message_from_file(fp)
+    email.Iterators._structure(msg)
+    check_attachments(msg,_list_attach)

rhsbl.m4

@@ -0,0 +1,44 @@
+divert(-1)
+#
+# Copyright (c) 2002 Derek J. Balling
+#	All rights reserved.
+#
+# Permission to use granted for all purposes. If modifications are made
+# they are requested to be sent to <dredd@megacity.org> for inclusion in future
+# versions 
+#
+# Allows (hopefully) for checking of access.db whitelisting now. This ONLY
+# works on sendmail-8.12.x ... use on any other version may require tinkering
+# by you the downloader.
+#
+# Incorporates many changes by Sergey S. Mokryshev <mokr@mokr.net>
+#
+#
+
+divert(0)
+ifdef(`_RHSBL_R_',`dnl',`dnl
+VERSIONID(`$Id$')
+define(`_RHSBL_R_',`')
+ifdef(`_DNSBL_R_',`dnl',`dnl
+LOCAL_CONFIG
+# map for DNS based blacklist lookups based on the sender RHS
+Kdnsbl host -T<TMP>')')
+divert(-1)
+define(`_RHSBL_SRV_', `_ARG_')dnl
+define(`_RHSBL_MSG_', `ifelse(len(X`'_ARG2_),`1',`"550 Mail from " $`'&{RHS} " refused by blackhole site '_RHSBL_SRV_`"',`_ARG2_')')dnl
+define(`_RHSBL_MSG_TMP_', `ifelse(_ARG3_,`t',`"451 Temporary lookup failure of " $`'&{RHS} " at '_RHSBL_SRV_`"',`_ARG3_')')dnl
+
+MAILER_DEFINITIONS
+
+SLocal_check_mail
+# DNS based RHS spam list blackholes.bmsi.com
+R$*			$: <?> $>CanonAddr $1
+R<?> $*<@$+.>		$: <?> $1<@$2.> $| $>SearchList <+ rhs> $| <F:$1@$2> <D:$2> <>
+R<?> $* $| <$={Accept}>	$: OKSOFAR
+R<?> $*<@$+.> $| $*	$: <?> $(dnsbl $2._RHSBL_SRV_. $: OK $) $(macro {RHS} $@ $2 $)
+R<?> OK			$: OKSOFAR
+R<?> $*<@$*>		$: OKSOFAR
+ifelse(len(X`'_ARG3_),`1',
+`R<?>$+<TMP>		$: TMPOK',
+`R<?>$+<TMP>		$#error $@ 4.7.1 $: _RHSBL_MSG_TMP_')
+R<?>$+			$#error $@ 5.7.1 $: _RHSBL_MSG_

sample.py

@@ -126,7 +126,7 @@ class sampleMilter(Milter.Milter):
   def eom(self):
     if not self.fp: return Milter.ACCEPT
     self.fp.seek(0)
-    msg = mime.MimeMessage(self.fp)
+    msg = mime.message_from_file(self.fp)
     msg.headerchange = self._headerChange
     if not mime.defang(msg,self.tempname):
       os.remove(self.tempname)

setup.cfg

@@ -2,3 +2,4 @@
 python=python2
 doc_files=README NEWS TODO
 packager=Stuart D. Gathman <stuart@bmsi.com>
+release=2.4

setup.py

@@ -12,7 +12,7 @@ if sys.version < '2.2.3':
   DistributionMetadata.classifiers = None
   DistributionMetadata.download_url = None
 
-setup(name = "milter", version = "0.7.0",
+setup(name = "milter", version = "0.8.1",
 	description="Python interface to sendmail milter API",
 	long_description="""\
 This is a python extension module to enable python scripts to
@@ -26,9 +26,13 @@ querying SPF records.
 	maintainer_email="stuart@bmsi.com",
 	license="GPL",
 	url="http://www.bmsi.com/python/milter.html",
-	py_modules=["Milter","mime","spf"],
+	py_modules=["mime","spf"],
+	packages = ['Milter'],
 	ext_modules=[
-	  Extension("milter", ["miltermodule.c"],libraries=libs),
+	  Extension("milter", ["miltermodule.c"],
+	    libraries=libs,
+	    define_macros = [ ('MAX_ML_REPLY',32) ]
+	  ),
 	],
 	keywords = ['sendmail','milter'],
 	classifiers = [
@@ -39,6 +43,7 @@ querying SPF records.
 	  'Natural Language :: English',
 	  'Operating System :: POSIX',
 	  'Programming Language :: Python',
-	  'Topic :: Communications :: Email :: Mail Transport Agents'
+	  'Topic :: Communications :: Email :: Mail Transport Agents',
+	  'Topic :: Communications :: Email :: Filters'
 	]
 )

softfail.txt

@@ -0,0 +1,23 @@
+Subject: SPF softfail (POSSIBLE FORGERY)
+
+This is an automatically generated Delivery Status Notification.
+
+THIS IS A WARNING MESSAGE ONLY.
+
+YOU DO *NOT* NEED TO RESEND YOUR MESSAGE.
+
+Delivery to the following recipients has been delayed.
+
+       %(rcpt)s
+
+Subject: %(subject)s
+Received-SPF: %(spf_result)s
+
+Your sender policy indicated that the above email was likely forged and that
+feedback was desired.
+
+If you need further assistance, please do not hesitate to contact me.
+
+Kind regards,
+
+postmaster@%(receiver)s

spf.py

@@ -2,6 +2,7 @@
 """SPF (Sender-Permitted From) implementation.
 
 Copyright (c) 2003, Terence Way
+Portions Copyright (c) 2004,2005 Stuart Gathman <stuart@bmsi.com>
 This module is free software, and you may redistribute it and/or modify
 it under the same terms as Python itself, so long as this copyright message
 and disclaimer are retained in their original form.
@@ -45,6 +46,43 @@ For news, bugfixes, etc. visit the home page for this implementation at
 # Terrence is not responding to email.
 #
 # $Log$
+# Revision 1.4  2005/06/02 04:18:55  customdesigned
+# Update copyright notices after reading article on /.
+#
+# Revision 1.3  2005/06/02 02:08:12  customdesigned
+# Reject on PermErr
+#
+# Revision 1.2  2005/05/31 18:57:59  customdesigned
+# Clear unknown mechanism list at proper time.
+#
+# Revision 1.24  2005/03/16 21:58:39  stuart
+# Change Milter module to package.
+#
+# Revision 1.22  2005/02/09 17:52:59  stuart
+# Report DNS errors as PermError rather than unknown.
+#
+# Revision 1.21  2004/11/20 16:37:03  stuart
+# Handle multi-segment TXT records.
+#
+# Revision 1.20  2004/11/19 06:10:30  stuart
+# Use PermError exception instead of reporting unknown.
+#
+# Revision 1.19  2004/11/09 23:00:18  stuart
+# Limit recursion and DNS lookups separately.
+#
+#
+# Revision 1.17  2004/09/10 18:08:26  stuart
+# Return unknown for null mechanism
+#
+# Revision 1.16  2004/09/04 23:27:06  stuart
+# More mechanism aliases.
+#
+# Revision 1.15  2004/08/30 21:19:05  stuart
+# Return unknown for invalid ip syntax in mechanism
+#
+# Revision 1.14  2004/08/23 02:28:24  stuart
+# Remove Perl usage message.
+#
 # Revision 1.13  2004/07/23 19:23:12  stuart
 # Always fail to match on ip6, until we support it properly.
 #
@@ -115,18 +153,9 @@ import xml.sax
 # (c) 2004 Python version by Stuart Gathman
 #
 # Date: 2004-02-25
-# Version: 1.0
-#
-# Usage:
-#  ./cid2spf.pl "<ep xmlns='http://ms.net/1'>...</ep>"
-#
-# Note that the 'include' directives will also have to be checked and
-# "translated". Future versions of this script might be able to get a
-# domain name as an argument and "crawl" the DNS for the necessary
-# information.
 #
 # A complete reverse translation (SPF -> CID) might be impossible, since
-# there are no way to handle:
+# there are no ways to handle:
 # - PTR and EXISTS mechanism 
 # - MX mechanism with an different domain as argument
 # - macros
@@ -290,7 +319,25 @@ except NameError:
 # standard default SPF record
 DEFAULT_SPF = 'v=spf1 a/24 mx/24 ptr'
 
-def check(i, s, h,local=None):
+# maximum DNS lookups allowed
+MAX_LOOKUP = 100
+MAX_RECURSION = 20
+
+class TempError(Exception):
+	"Temporary SPF error"
+
+class PermError(Exception):
+	"Permanent SPF error"
+	def __init__(self,msg,mech=None):
+	  Exception.__init__(self,msg,mech)
+	  self.msg = msg
+	  self.mech = mech
+	def __str__(self):
+	  if self.mech:
+	    return '%s: %s'%(self.msg,self.mech)
+	  return self.msg
+
+def check(i, s, h,local=None,receiver=None):
 	"""Test an incoming MAIL FROM:<s>, from a client with ip address i.
 	h is the HELO/EHLO domain name.
 
@@ -304,7 +351,7 @@ def check(i, s, h,local=None):
 	#>>> check(i='61.51.192.42', s='liukebing@bcc.com', h='bmsi.com')
 
 	"""
-	return query(i=i, s=s, h=h,local=local).check()
+	return query(i=i, s=s, h=h,local=local,receiver=receiver).check()
 
 class query(object):
 	"""A query object keeps the relevant information about a single SPF
@@ -325,16 +372,21 @@ class query(object):
 
 	Also keeps cache: DNS cache.
 	"""
-	def __init__(self, i, s, h,local=None):
+	def __init__(self, i, s, h,local=None,receiver=None):
 		self.i, self.s, self.h = i, s, h
+		if not s and h:
+		  self.s = 'postmaster@' + h
 		self.l, self.o = split_email(s, h)
 		self.t = str(int(time.time()))
 		self.v = 'in-addr'
 		self.d = self.o
 		self.p = None
+		if receiver:
+		  self.r = receiver
 		self.cache = {}
 		self.exps = dict(EXPLANATIONS)
 		self.local = local	# local policy
+    		self.lookups = 0
 
 	def set_default_explanation(self,exp):
 		exps = self.exps
@@ -359,31 +411,42 @@ class query(object):
 	Returns (result, mta-status-code, explanation) where
 	result in ['fail', 'softfail', 'neutral' 'unknown', 'pass', 'error']
 		"""
+		self.mech = []		# unknown mechanisms
 		if self.i.startswith('127.'):
 			return ('pass', 250, 'local connections always pass')
 
 		try:
+			self.lookups = 0
 			if not spf:
 			    spf = self.dns_spf(self.d)
 			if self.local and spf:
 			    spf += ' ' + self.local
 			return self.check1(spf, self.d, 0)
-		except DNS.DNSError:
-			return ('error', 450, 'SPF DNS Error')
+		except DNS.DNSError,x:
+			return ('error', 450, 'SPF DNS Error: ' + str(x))
+		except TempError,x:
+			return ('error', 450, 'SPF Temporary Error: ' + str(x))
+		except PermError,x:
+		    self.prob = x.msg
+		    self.mech.append(x.mech)
+		    # Pre-Lentczner draft treats this as an unknown result
+		    # and equivalent to no SPF record.
+		    # return ('unknown', 550, 'SPF Permanent Error: ' + str(x))
+		    return ('error', 550, 'SPF Permanent Error: ' + str(x))
 
 	def check1(self, spf, domain, recursion):
 		# spf rfc: 3.7 Processing Limits
 		#
-		if recursion > 20:
-			self.prob =  'Mechanisms used too many DNS lookups'
+		if recursion > MAX_RECURSION:
+			self.prob =  'Too many levels of recursion'
 			return ('unknown', 250, 'SPF recursion limit exceeded')
 		try:
 			tmp, self.d = self.d, domain
-			return self.check0(spf, recursion)
+			return self.check0(spf,recursion)
 		finally:
 			self.d = tmp
 
-	def check0(self, spf, recursion):
+	def check0(self, spf,recursion):
 		"""Test this query information against SPF text.
 
 		Returns (result, mta-status-code, explanation) where
@@ -405,7 +468,6 @@ class query(object):
 		# overridden with 'default=' modifier
 		#
 		default = 'neutral'
-		self.mech = []		# unknown mechanisms
 
 		# Look for modifiers
 		#
@@ -427,89 +489,86 @@ class query(object):
 		# Look for mechanisms
 		#
 		for mech in spf:
-			if RE_MODIFIER.match(mech): continue
-			m, arg, cidrlength = parse_mechanism(mech, self.d)
+		    if RE_MODIFIER.match(mech): continue
+		    m, arg, cidrlength = parse_mechanism(mech, self.d)
 
-			# map '?' '+' or '-' to 'unknown' 'pass' or 'fail'
-			result = RESULTS.get(m[0])
-			if result:
-				# eat '?' '+' or '-'
-				m = m[1:]
-			else:
-				# default pass
-				result = 'pass'
+		    # map '?' '+' or '-' to 'unknown' 'pass' or 'fail'
+		    if m:
+		      result = RESULTS.get(m[0])
+		      if result:
+			    # eat '?' '+' or '-'
+			    m = m[1:]
+		      else:
+			    # default pass
+			    result = 'pass'
 
-			if m in ['a', 'mx', 'ptr', 'exists', 'include']:
-				arg = self.expand(arg)
+		    if m in ['a', 'mx', 'ptr', 'prt', 'exists', 'include']:
+			    arg = self.expand(arg)
 
-			if m == 'include':
-			    if arg != self.d:
-				res,code,txt = self.check1(self.dns_spf(arg),
-						  arg, recursion + 1)
-				if res == 'pass':
-					break
-				if res in ('fail','neutral','softfail'):
-					continue
-				if res == 'none':
-				  	self.prob = \
-					  'Could not find a valid SPF record'
-				  	res = 'unknown'
-				return res,code,txt
-			    else:
-			    	self.prob = 'Required option is missing'
-				self.mech.append(mech)
-				return ('unknown', 250, 'missing SPF option')
+		    if m == 'include':
+		      if arg != self.d:
+			res,code,txt = self.check1(self.dns_spf(arg),
+					  arg, recursion + 1)
+			if res == 'pass':
+			  break
+			if res == 'none':
+			  raise PermError(
+			    'No valid SPF record for included domain: %s'%arg,
+			    mech)
+			continue
+		      else:
+			raise PermError('include mechanism missing domain',mech)
+		    elif m == 'all':
+			    break
 
-			elif m == 'all':
+		    elif m == 'exists':
+			    if len(self.dns_a(arg)) > 0:
+				    break
+
+		    elif m == 'a':
+			    if cidrmatch(self.i, self.dns_a(arg),
+					 cidrlength):
+				    break
+
+		    elif m == 'mx':
+			    if cidrmatch(self.i, self.dns_mx(arg),
+					 cidrlength):
+				    break
+
+		    elif m in ('ip4', 'ipv4', 'ip') and arg != self.d:
+			try:
+			    if cidrmatch(self.i, [arg], cidrlength):
 				break
+			except socket.error:
+			    raise PermError('syntax error',mech)
 			    
-			elif m == 'exists':
-				if len(self.dns_a(arg)) > 0:
-					break
+		    elif m in ('ip6', 'ipv6'):
+		    # Until we support IPV6, we should never
+		    # get an IPv6 connection.  So this mech
+		    # will never match.
+			    pass
 
-			elif m == 'a':
-				if cidrmatch(self.i, self.dns_a(arg),
-				             cidrlength):
-					break
-
-			elif m == 'mx':
-				if cidrmatch(self.i, self.dns_mx(arg),
-				             cidrlength):
-					break
-
-			elif m in ('ip4', 'ipv4', 'ip') and arg != self.d:
-				if cidrmatch(self.i, [arg], cidrlength):
-					break
-			elif m == 'ip6':
-			# Until we support IPV6, we should never
-			# get an IPv6 connection.  So this mech
-			# will never match.
-				pass
-
-			elif m in ('ptr', 'prt'):
-				if domainmatch(self.validated_ptrs(self.i),
-				               arg):
-					break
-
-			else:
-				# unknown mechanisms cause immediate unknown
-				# abort results
-				self.mech.append(mech)
-				self.prob = 'Unknown mechanism found'
-				return ('unknown',250,'unknown SPF mechanism')
+		    elif m in ('ptr', 'prt'):
+			    if domainmatch(self.validated_ptrs(self.i),
+					   arg):
+				    break
 
+		    else:
+		      # unknown mechanisms cause immediate unknown
+		      # abort results
+		      raise PermError('Unknown mechanism found',mech)
 		else:
-			# no matches
-			if redirect:
-				return self.check1(self.dns_spf(redirect),
-				                   redirect, recursion+1)
-			else:
-				result = default
+		    # no matches
+		    if redirect:
+			return self.check1(self.dns_spf(redirect),
+					       redirect, recursion + 1)
+		    else:
+			result = default
 
 		if result == 'fail':
-			return (result, 550, exps[result])
+		    return (result, 550, exps[result])
 		else:
-			return (result, 250, exps[result])
+		    return (result, 250, exps[result])
 
 	def get_explanation(self, spec):
 		"""Expand an explanation."""
@@ -626,17 +685,19 @@ class query(object):
 		  if not a:
 		    # No SPF record: convert and return CID if present
 		    p = CIDParser(q=self)
-		    return p.spf_txt(domain)
+		    try:
+		      return p.spf_txt(domain)
+		    except xml.sax._exceptions.SAXParseException:
+		      raise PermError("Caller-ID parse error",domain)
 
 		if len(a) == 1:
 			return a[0]
-		else:
-			return None
+		return None
 
 	def dns_txt(self, domainname):
 		"Get a list of TXT records for a domain name."
 		if domainname:
-		  return [t for a in self.dns(domainname, 'TXT') for t in a]
+		  return [''.join(a) for a in self.dns(domainname, 'TXT')]
 		return []
 
 	def dns_mx(self, domainname):
@@ -678,6 +739,9 @@ class query(object):
 		pre: qtype in ['A', 'AAAA', 'MX', 'PTR', 'TXT', 'SPF']
 		post: isinstance(__return__, types.ListType)
 		"""
+		self.lookups += 1
+		if self.lookups > MAX_LOOKUP:
+			raise PermError('Too many DNS lookups')
 		result = self.cache.get( (name, qtype) )
 		cname = None
 		if not result:
@@ -695,7 +759,7 @@ class query(object):
 		return result
 
 	def get_header(self,res,receiver):
-	  if res in ('pass','fail'):
+	  if res in ('pass','fail','softfail'):
 	    return '%s (%s: %s) client-ip=%s; envelope-from=%s; helo=%s;' % (
 	  	res,receiver,self.get_header_comment(res),self.i,
 	        self.l + '@' + self.o, self.h)
@@ -912,12 +976,12 @@ def bin2addr(addr):
 def expand_one(expansion, str, joiner):
 	if not str:
 		return expansion
-	len, reverse, delimiters = RE_ARGS.split(str)[1:4]
+	ln, reverse, delimiters = RE_ARGS.split(str)[1:4]
 	if not delimiters:
 		delimiters = '.'
 	expansion = split(expansion, delimiters, joiner)
 	if reverse: expansion.reverse()
-	if len: expansion = expansion[-int(len)*2+1:]
+	if ln: expansion = expansion[-int(ln)*2+1:]
 	return ''.join(expansion)
 
 def split(str, delimiters, joiner=None):
@@ -961,13 +1025,15 @@ if __name__ == '__main__':
 		print USAGE
 		_test()
 	elif len(sys.argv) == 2:
-		q = query(i='127.0.0.1', s='localhost', h='unknown')
+		q = query(i='127.0.0.1', s='localhost', h='unknown',
+			receiver=socket.gethostname())
 		print q.dns_spf(sys.argv[1])
 	elif len(sys.argv) == 4:
-		print check(i=sys.argv[1], s=sys.argv[2], h=sys.argv[3])
+		print check(i=sys.argv[1], s=sys.argv[2], h=sys.argv[3],
+			receiver=socket.gethostname())
 	elif len(sys.argv) == 5:
 		i, s, h = sys.argv[2:]
-		q = query(i=i, s=s, h=h)
+		q = query(i=i, s=s, h=h, receiver=socket.gethostname())
 		print q.check(sys.argv[1])
 	else:
 		print USAGE

spfquery.py

@@ -1,5 +1,13 @@
 #!/usr/bin/python2.3
+
+# Author: Stuart D. Gathman <stuart@bmsi.com>
+# Copyright 2004 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
+
 # $Log$
+# Revision 1.1.1.1  2005/05/31 18:07:19  customdesigned
+# Release 0.6.9
+#
 # Revision 2.3  2004/04/19 22:12:11  stuart
 # Release 0.6.9
 #

strike3.txt

@@ -0,0 +1,66 @@
+Subject: Critical mail server configuration error
+
+This is an automatically generated Delivery Status Notification.
+
+THIS IS A WARNING MESSAGE ONLY.
+
+YOU DO *NOT* NEED TO RESEND YOUR MESSAGE.
+
+Delivery to the following recipients has been delayed.
+
+	%(rcpt)s
+
+Subject: %(subject)s 
+
+Someone at IP address %(connectip)s sent an email claiming
+to be from %(sender)s.  
+
+If that wasn't you, then your domain, %(sender_domain)s,
+was forged - i.e. used without your knowlege or authorization by
+someone attempting to steal your mail identity.  This is a very
+serious problem, and you need to provide authentication for your
+SMTP (email) servers to prevent criminals from forging your
+domain.  The simplest step is usually to publish an SPF record
+with your Sender Policy.  
+
+For more information, see: http://spf.pobox.com
+
+I hate to annoy you with a DSN (Delivery Status
+Notification) from a possibly forged email, but since you
+have not published a sender policy, there is no other way
+of bringing this to your attention.
+
+If it *was* you that sent the email, then your email domain
+or configuration is in error.  If you don't know anything
+about mail servers, then pass this on to your SMTP (mail)
+server administrator.  We have accepted the email anyway, in
+case it is important, but we couldn't find anything about
+the mail submitter at %(connectip)s to distinguish it from a
+zombie (compromised/infected computer - usually a Windows
+PC).  There was no PTR record for its IP address (PTR names
+that contain the IP address don't count).  RFC2821 requires
+that your hello name be a FQN (Fully Qualified domain Name,
+i.e. at least one dot) that resolves to the IP address of
+the mail sender.  In addition, just like for PTR, we don't
+accept a helo name that contains the IP, since this doesn't
+help to identify you.  The hello name you used,
+%(heloname)s, was invalid.
+
+Furthermore, there was no SPF record for the sending domain
+%(sender_domain)s.  We even tried to find its IP in any A or
+MX records for your domain, but that failed also.  We really
+should reject mail from anonymous mail clients, but in case
+it is important, we are accepting it anyway.
+
+We are sending you this message to alert you to the fact that
+
+Either - Someone is forging your domain.
+Or - You have problems with your email configuration.
+Or - Possibly both.
+
+If you need further assistance, please do not hesitate to
+contact me again.
+
+Kind regards,
+
+postmaster@%(receiver)s

test/missingboundary

@@ -0,0 +1,128 @@
+From leec@windowsshop.com Fri Sep 10 11:48:25 2004
+Message-ID: <4141CDD4.7040305@windowsshop.com>
+Date: Fri, 10 Sep 2004 11:52:52 -0400
+From: Lee Connor <leec@windowsshop.com>
+User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)
+X-Accept-Language: en-us, en
+MIME-Version: 1.0
+To: Cleo Matthews-Conley <cleom@windowsshop.com>, 
+ Tony Collini <tonyc@windowsshop.com>,
+ John Higinbothom <johnh@windowsshop.com>
+CC: Rich Higgins <richh@windowsshop.com>
+Subject: [Fwd: [Fwd: Customer Concerns]]
+Content-Type: multipart/mixed;
+ boundary="------------020209070802060007090105"
+
+This is a multi-part message in MIME format.
+--------------020209070802060007090105
+Content-Type: text/plain; charset=us-ascii; format=flowed
+Content-Transfer-Encoding: 7bit
+
+Cleo - please review attached feedback from Sales team.......I recall at 
+an early meeting after we moved in you and Tony (and maybe 1 or 2 
+others) were going to develop a voice mail procedure or instruction 
+sheet for all staff. It looks like we really need this to get what we 
+are looking for from the system. Please let me know when you can produce 
+this and give a draft to the managers here for review.
+Thanks,
+Lee
+
+
+--------------020209070802060007090105
+Content-Type: message/rfc822;
+ name="[Fwd: Customer Concerns]"
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline;
+ filename="[Fwd: Customer Concerns]"
+
+Return-Path: <richh@windowsshop.com>
+Received: from windowsshop.com (pc147.windowsshop.com [192.168.100.147] (may be forged))
+	by lord.windowsshop.com (8.12.10/8.12.10) with ESMTP id i89KCClX003425
+	for <leec@windowsshop.com>; Thu, 9 Sep 2004 16:12:12 -0400
+Message-ID: <4140B851.3020501@windowsshop.com>
+Date: Thu, 09 Sep 2004 16:08:49 -0400
+From: Rich <richh@windowsshop.com>
+User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01
+X-Accept-Language: en-us, en
+MIME-Version: 1.0
+To: Lee Connor <leec@windowsshop.com>
+Subject: [Fwd: Customer Concerns]
+Content-Type: multipart/mixed;
+ boundary="------------030301030706020401010801"
+X-DSpam-Score: 0.000000
+
+This is a multi-part message in MIME format.
+--------------030301030706020401010801
+Content-Type: text/plain; charset=us-ascii; format=flowed
+Content-Transfer-Encoding: 7bit
+
+Lee - do you want me to do anything else with this?
+
+Rich
+
+<!DSPAM:FEE4D3278234264874834386>
+
+
+--------------030301030706020401010801
+Content-Type: message/rfc822; name="Customer Concerns";
+	boundary="===============0045392615=="
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline;
+ filename="Customer Concerns"
+
+
+Return-Path: <joes@windowsshop.com>
+Received: from joes (pc148.windowsshop.com [192.168.100.148] (may be forged))
+	by lord.windowsshop.com (8.12.10/8.12.10) with SMTP id i89K9BlX003262
+	for <richh@windowsshop.com>; Thu, 9 Sep 2004 16:09:11 -0400
+From: "Joe Schmuck" <joes@windowsshop.com>
+To: <richh@windowsshop.com>
+Subject: Customer Concerns
+Date: Thu, 9 Sep 2004 16:08:26 -0400
+Message-ID: <OFEPKHCCLPIECLFBLDHBAEAECAAA.joes@windowsshop.com>
+MIME-Version: 1.0
+Content-Type: text/plain;
+	charset="iso-8859-1"
+Content-Transfer-Encoding: 7bit
+X-Priority: 3 (Normal)
+X-MSMail-Priority: Normal
+X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
+Importance: Normal
+X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
+X-DSpam-Score: 0.000000
+
+Rich:
+
+Following is a summary of concerns from customers regarding internal
+communications within WS:
+
+	- Not all employees have activated their voice mail - when this is the
+case, the system will automatically cut you off
+	- When employees are out of the office, phones are not forwarded to a back
+up, ie manager
+	- Reception has no record of employee attendance, and therefore will
+forward call to individual requested - see point 2
+ 	- Reception directs calls to incorrect individuals
+ 	- When entering voice mail, if you press '0', system does not default to
+operator, but puts you back into individual 	voice mail
+	- Reception phone demeanor has no 'pep'
+
+Thanks
+Joe
+
+
+
+
+---
+Outgoing mail is certified Virus Free.
+Checked by AVG anti-virus system (http://www.grisoft.com).
+Version: 6.0.752 / Virus Database: 503 - Release Date: 9/3/2004
+
+
+<!DSPAM:FEE4D05F1332634871908793>
+
+--===============0045392615==--
+--------------030301030706020401010801--
+
+--------------020209070802060007090105--
+

test/zip1

@@ -0,0 +1,51 @@
+From paulp@go2net.com  Wed Jun  1 22:35:12 2005
+Return-Path: <paulp@go2net.com>
+Received: from mail.bmsi.com (spidey.bmsi.com [192.168.9.81])
+	by bmsred.bmsi.com (8.13.1/8.12.10) with ESMTP id j522ZCQg014058
+	for <stuart@bmsred.bmsi.com>; Wed, 1 Jun 2005 22:35:12 -0400
+Received: from 127.0.0.1 ([220.117.92.241])
+	by mail.bmsi.com (8.13.1/8.13.1) with ESMTP id j522Ynjm028604
+	for stuart@bmsi.com; Wed, 1 Jun 2005 22:34:51 -0400
+Message-Id: <200506020234.j522Ynjm028604@mail.bmsi.com>
+SUBJECT: urgent
+FROM: paulp@go2net.com
+TO: stuart@bmsi.com
+DATE: [[ ¸ñ, 02 6 2005 ¿ÀÀü 11:34:47 ]]
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="--------bound--"
+X-DSpam-Score: 0.081200
+Received-SPF: neutral (mail.bmsi.com: guessing: 220.117.92.241 is neither permitted nor denied by domain of go2net.com)
+Status: RO
+X-Status: 
+X-Keywords: NonJunk         
+
+----------bound--
+Content-Type: text/plain; charset=us-ascii
+Content-Transfer-Encoding: 7bit
+
+Hi 
+
+Sorry, I forgot to send an important
+document to you in that last email. I had an important phone call.
+Please checkout attached doc file when you have a moment.
+
+Best Regards
+
+<!DSPAM:1043AE6B6492860536935410>
+
+
+----------bound--
+Content-Type: application/x-msdownload; name="zip.zip"
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment; filename="zip.zip"
+
+UEsDBAoAAAAAADVVwjLaV2nEGgAAABoAAAAzABUAemlwLmRvYyAgICAgICAgICAgICAgICAg
+ICAgICAgICAgICAgICAgICAgICAgICAuZXhlVVQJAAOmGp9CphqfQlV4BACGA2UAVGhpcyBw
+cm9ncmFtIHdhcyBhIHZpcnVzLgpQSwECFwMKAAAAAAA1VcIy2ldpxBoAAAAaAAAAMwANAAAA
+AAABAAAAtIEAAAAAemlwLmRvYyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg
+ICAgICAuZXhlVVQFAAOmGp9CVXgAAFBLBQYAAAAAAQABAG4AAACAAAAAAAA=
+----------bound--
+
+
+----------bound----
+

test/ziploop

@@ -0,0 +1,47 @@
+From ttaie1@thfalcon.com Thu Jun 16 10:23:13 2005
+Received: from thfalcon.com (unknown [202.90.113.150])
+	by thfalcon.com (Postfix) with ESMTP id 32F0DD819C
+	for <stuart@bmsi.com>; Thu, 16 Jun 2005 15:42:08 +0700 (ICT)
+From: ttaie1@thfalcon.com
+To: stuart@bmsi.com
+Subject: Returned mail: see transcript for details
+Date: Thu, 16 Jun 2005 15:50:10 +0700
+MIME-Version: 1.0
+Content-Type: multipart/mixed;
+	boundary="----=_NextPart_000_0014_E4E04420.5619685C"
+X-Priority: 3
+X-MSMail-Priority: Normal
+X-Mailer: Microsoft Outlook Express 6.00.2600.0000
+X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
+Message-Id: <20050616084208.32F0DD819C@thfalcon.com>
+Received-SPF: pass (mail.bmsi.com: guessing: domain of thfalcon.com designates 203.147.3.44 as permitted sender) client-ip=203.147.3.44; envelope-from=ttaie1@thfalcon.com; helo=thfalcon.com;
+
+This is a multi-part message in MIME format.
+
+------=_NextPart_000_0014_E4E04420.5619685C
+Content-Type: text/plain;
+	charset=us-ascii
+Content-Transfer-Encoding: 7bit
+
+Message could not be delivered
+
+
+------=_NextPart_000_0014_E4E04420.5619685C
+Content-Type: application/octet-stream;
+	name="stuart@bmsi.com.zip"
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment;
+	filename="stuart@bmsi.com.zip"
+
+UEsDBAoAAAAAAM6r0DL7SfbCBAEAAAQBAAAFABUAdC56aXBVVAkAA7MnskK4J7JCVXgEAIYD
+ZQBQSwMECgAAAAAANVXCMtpXacQaAAAAGgAAADMAFQB6aXAuZG9jICAgICAgICAgICAgICAg
+ICAgICAgICAgICAgICAgICAgICAgICAgIC5leGVVVAkAA6Yan0KmGp9CVXgEAIYDZQBUaGlz
+IHByb2dyYW0gd2FzIGEgdmlydXMuClBLAQIXAwoAAAAAADVVwjLaV2nEGgAAABoAAAAzAA0A
+AAAAAAEAAAC0gQAAAAB6aXAuZG9jICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg
+ICAgICAgIC5leGVVVAUAA6Yan0JVeAAAUEsFBgAAAAABAAEAbgAAAIAAAAAAAFBLAQIXAwoA
+AAAAAM6r0DL7SfbCBAEAAAQBAAAFAA0AAAAAAAAAAAC0gQAAAAB0LnppcFVUBQADsyeyQlV4
+AABQSwUGAAAAAAEAAQBAAAAAPAEAAAAA
+
+------=_NextPart_000_0014_E4E04420.5619685C--
+
+

testbms.py

@@ -4,6 +4,8 @@ import bms
 import mime
 import rfc822
 import StringIO
+import email
+import sys
 #import pdb
 
 class TestMilter(bms.bmsMilter):
@@ -25,7 +27,7 @@ class TestMilter(bms.bmsMilter):
   def replacebody(self,chunk):
     if self._body:
       self._body.write(chunk)
-      self.bodyreplaced = 1
+      self.bodyreplaced = True
     else:
       raise IOError,"replacebody not called from eom()"
 
@@ -39,14 +41,14 @@ class TestMilter(bms.bmsMilter):
       del self._msg[field]
     else:
       self._msg[field] = value
-    self.headerschanged = 1
+    self.headerschanged = True
 
   def addheader(self,field,value):
     if not self._body:
       raise IOError,"addheader not called from eom()"
     self.log('addheader: %s=%s' % (field,value))
     self._msg[field] = value
-    self.headerschanged = 1
+    self.headerschanged = True
 
   def delrcpt(self,rcpt):
     if not self._body:
@@ -63,8 +65,8 @@ class TestMilter(bms.bmsMilter):
 
   def feedFile(self,fp,sender="spam@adv.com",rcpt="victim@lamb.com"):
     self._body = None
-    self.bodyreplaced = 0
-    self.headerschanged = 0
+    self.bodyreplaced = False
+    self.headerschanged = False
     self.reply = None
     msg = rfc822.Message(fp)
     rc = self.envfrom('<%s>'%sender)
@@ -118,7 +120,7 @@ class TestMilter(bms.bmsMilter):
 
   def connect(self,host='localhost'):
     self._body = None
-    self.bodyreplaced = 0
+    self.bodyreplaced = False
     rc =  bms.bmsMilter.connect(self,host,1,('1.2.3.4',1234)) 
     if rc != Milter.CONTINUE and rc != Milter.ACCEPT:
       self.close()
@@ -141,7 +143,7 @@ class BMSMilterTestCase(unittest.TestCase):
     open('test/'+fname+".tstout","w").write(fp.getvalue())
     #self.failUnless(fp.getvalue() == open("test/virus1.out","r").read())
     fp.seek(0)
-    msg = mime.MimeMessage(fp)
+    msg = mime.message_from_file(fp)
     str = msg.get_payload(1).get_payload()
     milter.log(str)
     milter.close()
@@ -218,7 +220,9 @@ class BMSMilterTestCase(unittest.TestCase):
     #pdb.set_trace()
     rc = milter.feedMsg('test8')
     self.assertEqual(rc,Milter.ACCEPT)
-    self.failUnless(milter.bodyreplaced,"Message body not replaced")
+    # python2.4 doesn't scan encoded message attachments
+    if sys.hexversion < 0x02040000:
+      self.failUnless(milter.bodyreplaced,"Message body not replaced")
     #self.failIf(milter.bodyreplaced,"Message body replaced")
     fp = milter._body
     open("test/test8.tstout","w").write(fp.getvalue())
@@ -237,9 +241,12 @@ class BMSMilterTestCase(unittest.TestCase):
     bms.smart_alias[key] = ['ham@eggs.com']
     rc = milter.feedMsg('test8',key[0],key[1])
     self.assertEqual(rc,Milter.ACCEPT)
-    self.failUnless(milter.bodyreplaced,"Message body not replaced")
     self.failUnless(milter._delrcpt == ['<baz@bat.com>'])
     self.failUnless(milter._addrcpt == ['<ham@eggs.com>'])
+    # python2.4 email does not decode message attachments, so script
+    # is not replaced
+    if sys.hexversion < 0x02040000:
+      self.failUnless(milter.bodyreplaced,"Message body not replaced")
 
   def testBadBoundary(self):
     milter = TestMilter()
@@ -247,8 +254,11 @@ class BMSMilterTestCase(unittest.TestCase):
     # test rfc822 attachment with invalid boundaries
     #pdb.set_trace()
     rc = milter.feedMsg('bound')
-    self.assertEqual(rc,Milter.REJECT)
-    self.assertEqual(milter.reply[0],'554')
+    if sys.hexversion < 0x02040000:
+      # python2.4 adds invalid boundaries to decects list and makes
+      # payload a str
+      self.assertEqual(rc,Milter.REJECT)
+      self.assertEqual(milter.reply[0],'554')
     #self.failUnless(milter.bodyreplaced,"Message body not replaced")
     self.failIf(milter.bodyreplaced,"Message body replaced")
     fp = milter._body
@@ -277,7 +287,6 @@ class BMSMilterTestCase(unittest.TestCase):
 def suite(): return unittest.makeSuite(BMSMilterTestCase,'test')
 
 if __name__ == '__main__':
-  import sys
   if len(sys.argv) > 1:
     for fname in sys.argv[1:]:
       milter = TestMilter()

testmime.py

@@ -1,8 +1,29 @@
+# $Log$
+# Revision 1.2  2005/06/02 15:00:17  customdesigned
+# Configure banned extensions.  Scan zipfile option with test case.
+#
+# Revision 1.1.1.2  2005/05/31 18:23:49  customdesigned
+# Development changes since 0.7.2
+#
+# Revision 1.23  2005/02/11 18:34:14  stuart
+# Handle garbage after quote in boundary.
+#
+# Revision 1.22  2005/02/10 01:10:59  stuart
+# Fixed MimeMessage.ismodified()
+#
+# Revision 1.21  2005/02/10 00:56:49  stuart
+# Runs with python2.4.  Defang not working correctly - more work needed.
+#
+# Revision 1.20  2004/11/20 16:38:17  stuart
+# Add rcs log
+#
 import unittest
 import mime
 import socket
 import StringIO
 import email
+import sys
+from email import Errors
 
 samp1_txt1 = """Dear Agent 1
 I hope you can read this.  Whenever you write label it  P.B.S kids.
@@ -24,23 +45,40 @@ class MimeTestCase(unittest.TestCase):
     self.failUnless(plist[0] == 'name="Jim&Girlz.jpg"')
 
   def testParse(self,fname='samp1'):
-    msg = mime.MimeMessage(open('test/'+fname,"r"))
+    msg = mime.message_from_file(open('test/'+fname,"r"))
     self.failUnless(msg.ismultipart())
     parts = msg.get_payload()
     self.failUnless(len(parts) == 2)
     txt1 = parts[0].get_payload()
     self.failUnless(txt1.rstrip() == samp1_txt1,txt1)
+    msg = mime.message_from_file(open('test/missingboundary',"r"))
+    # should get no exception as long as we don't try to parse
+    # message attachments
+    mime.defang(msg,scan_rfc822=False)
+    msg.dump(open('test/missingboundary.out','w'))
+    msg = mime.message_from_file(open('test/missingboundary',"r"))
+    try:
+      mime.defang(msg)
+      # python 2.4 doesn't get exceptions on missing boundaries, and
+      # if message is modified, output is readable by mail clients
+      if sys.hexversion < 0x02040000:
+	self.fail('should get boundary error parsing bad rfc822 attachment')
+    except Errors.BoundaryError:
+      pass
   
   def testDefang(self,vname='virus1',part=1,
   	fname='LOVE-LETTER-FOR-YOU.TXT.vbs'):
-    msg = mime.MimeMessage(open('test/'+vname,"r"))
-    mime.defang(msg)
+    msg = mime.message_from_file(open('test/'+vname,"r"))
+    mime.defang(msg,scan_zip=True)
+    self.failUnless(msg.ismodified(),"virus not removed")
     oname = vname + '.out'
     msg.dump(open('test/'+oname,"w"))
-    msg = mime.MimeMessage(open('test/'+oname,"r"))
-    parts = msg.get_payload()
-    txt2 = parts[part].get_payload()
-    self.failUnless(txt2.rstrip()+'\n' == mime.virus_msg % (fname,hostname,None),txt2)
+    msg = mime.message_from_file(open('test/'+oname,"r"))
+    txt2 = msg.get_payload()
+    if type(txt2) == list:
+      txt2 = txt2[part].get_payload()
+    self.failUnless(
+      txt2.rstrip()+'\n' == mime.virus_msg % (fname,hostname,None),txt2)
 
   def testDefang3(self):
     self.testDefang('virus3',0,'READER_DIGEST_LETTER.TXT.pif')
@@ -55,11 +93,11 @@ class MimeTestCase(unittest.TestCase):
 
   # virus6 has no parts - the virus is directly inline
   def testDefang6(self,vname="virus6",fname='FAX20.exe'):
-    msg = mime.MimeMessage(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"r"))
     mime.defang(msg)
     oname = vname + '.out'
     msg.dump(open('test/'+oname,"w"))
-    msg = mime.MimeMessage(open('test/'+oname,"r"))
+    msg = mime.message_from_file(open('test/'+oname,"r"))
     self.failIf(msg.ismultipart())
     txt2 = msg.get_payload()
     self.failUnless(txt2 == mime.virus_msg % \
@@ -68,11 +106,11 @@ class MimeTestCase(unittest.TestCase):
   # honey virus has a sneaky ASP payload which is parsed correctly
   # by email package in python-2.2.2, but not by mime.MimeMessage or 2.2.1
   def testDefang7(self,vname="honey",fname='story[1].scr'):
-    msg = mime.MimeMessage(open('test/'+vname,"r"))
+    msg = mime.message_from_file(open('test/'+vname,"r"))
     mime.defang(msg)
     oname = vname + '.out'
     msg.dump(open('test/'+oname,"w"))
-    msg = mime.MimeMessage(open('test/'+oname,"r"))
+    msg = mime.message_from_file(open('test/'+oname,"r"))
     parts = msg.get_payload()
     txt2 = parts[1].get_payload()
     txt3 = parts[2].get_payload()
@@ -83,13 +121,21 @@ class MimeTestCase(unittest.TestCase):
 	  ('story[1].asp',hostname,None),txt3)
 
   def testParse2(self,fname="spam7"):
-    msg = mime.MimeMessage(open('test/'+fname,"r"))
+    msg = mime.message_from_file(open('test/'+fname,"r"))
     self.failUnless(msg.ismultipart())
     parts = msg.get_payload()
     self.failUnless(len(parts) == 2)
     name = parts[1].getname()
     self.failUnless(name == "Jim&amp;amp;Girlz.jpg","name=%s"%name)
 
+  def testZip(self,vname="zip1",fname='zip.zip'):
+    self.testDefang(vname,1,'zip.zip')
+    msg = mime.message_from_file(open('test/'+vname,"r"))
+    mime.defang(msg,scan_zip=False)
+    self.failIf(msg.ismodified())
+    # test zip within zip
+    self.testDefang('ziploop',1,'stuart@bmsi.com.zip')
+
   def testHTML(self,fname=""):
     result = StringIO.StringIO()
     filter = mime.HTMLScriptFilter(result)
@@ -106,10 +152,11 @@ class MimeTestCase(unittest.TestCase):
 def suite(): return unittest.makeSuite(MimeTestCase,'test')
 
 if __name__ == '__main__':
-  import sys
   if len(sys.argv) < 2:
     unittest.main()
   else:
     for fname in sys.argv[1:]:
       fp = open(fname,'r')
-      msg = mime.MimeMessage(fp)
+      msg = mime.message_from_file(fp)
+      mime.defang(msg,scan_zip=True)
+      print msg.as_string()

testsample.py

@@ -17,7 +17,7 @@ class TestMilter(sample.sampleMilter):
   def replacebody(self,chunk):
     if self._body:
       self._body.write(chunk)
-      self.bodyreplaced = 1
+      self.bodyreplaced = True
     else:
       raise IOError,"replacebody not called from eom()"
 
@@ -29,16 +29,16 @@ class TestMilter(sample.sampleMilter):
       del self._msg[field]
     else:
       self._msg[field] = value
-    self.headerschanged = 1
+    self.headerschanged = True
 
   def addheader(self,field,value):
     self.log('addheader: %s=%s' % (field,value))
     self._msg[field] = value
-    self.headerschanged = 1
+    self.headerschanged = True
 
   def feedMsg(self,fname):
     self._body = None
-    self.bodyreplaced = 0
+    self.bodyreplaced = False
     self.headerschanged = 0
     fp = open('test/'+fname,'r')
     msg = rfc822.Message(fp)
@@ -85,7 +85,7 @@ class TestMilter(sample.sampleMilter):
 
   def connect(self,host='localhost'):
     self._body = None
-    self.bodyreplaced = 0
+    self.bodyreplaced = False
     rc =  sample.sampleMilter.connect(self,host,1,0) 
     if rc != Milter.CONTINUE and rc != Milter.ACCEPT:
       self.close()
@@ -108,7 +108,7 @@ class BMSMilterTestCase(unittest.TestCase):
     open('test/'+fname+".tstout","w").write(fp.getvalue())
     #self.failUnless(fp.getvalue() == open("test/virus1.out","r").read())
     fp.seek(0)
-    msg = mime.MimeMessage(fp)
+    msg = mime.message_from_file(fp)
     s = msg.get_payload(1).get_payload()
     milter.log(s)
     milter.close()