stuart at bmsi
Aug 7, 2008, 1:00 PM
Post #4 of 4
(5070 views)
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On Thu, 7 Aug 2008, Stuart D. Gathman wrote:
> > assume I need to run something that will allow the rewriteing. What does
> > any one suggest to use?
>
> Until postfix allows plugins to modify MAIL FROM (are you sure that is
> still an issue?), you will have to use an smtp proxy. I looked at this
> for sendmail as possibly preferable to CF code, but sendmail now supports
> modifying MAIL FROM via milter, so it is a non-issue.
There is even a proxy class already provided in the smtpd module.
Just derive from smtpd.PureProxy and override process_message().
Since SMTPServer collects the entire HELO+MFROM+RCPTs+DATA before
calling process_message, I'm not sure about timing for large messages.
But it may do the trick for you.
Untested code:
import asyncore
import smtpd
import SRS
from ConfigParser import ConfigParser
cp = ConfigParser({
'secret': 'shhhh!',
'maxage': '8',
'hashlength': '8',
'separator': '=',
'socket': '/var/run/milter/pysrs'
})
class SRSProxy(smtpd.PureProxy):
def __init__(self,listen,relay):
self.srs = SRS.new(
secret=cp.get('srs','secret'),
maxage=cp.getint('srs','maxage'),
hashlength=cp.getint('srs','hashlength'),
separator=cp.get('srs','separator'),
alwaysrewrite=True # skip calling us for local domains
)
self.fwdomain = cp.get('srs','fwdomain',None)
smtpd.PureProxy.__init__(self,listen,relay)
def process_message(self,helo,mfrom,rcpts,data):
# ... lots of special cases for no-srs, signonly, etc excluded
new_address = self.srs.forward(mfrom,self.fwdomain)
smtpd.PureProxy.process_message(self,helo,new_address,rcpts,data)
# prolly want to log stuff
cp.read(["/etc/mail/pysrs.cfg"])
proxy = SRSProxy('127.0.0.2','relay.fwdomain.com')
asyncore.loop()
--
Stuart D. Gathman <stuart [at] bmsi>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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