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Diffstat (limited to 'lib/python2.7/smtpd.py')
| -rwxr-xr-x | lib/python2.7/smtpd.py | 555 |
1 files changed, 0 insertions, 555 deletions
diff --git a/lib/python2.7/smtpd.py b/lib/python2.7/smtpd.py deleted file mode 100755 index b4d208b..0000000 --- a/lib/python2.7/smtpd.py +++ /dev/null @@ -1,555 +0,0 @@ -#! /usr/bin/env python -"""An RFC 2821 smtp proxy. - -Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]] - -Options: - - --nosetuid - -n - This program generally tries to setuid `nobody', unless this flag is - set. The setuid call will fail if this program is not run as root (in - which case, use this flag). - - --version - -V - Print the version number and exit. - - --class classname - -c classname - Use `classname' as the concrete SMTP proxy class. Uses `PureProxy' by - default. - - --debug - -d - Turn on debugging prints. - - --help - -h - Print this message and exit. - -Version: %(__version__)s - -If localhost is not given then `localhost' is used, and if localport is not -given then 8025 is used. If remotehost is not given then `localhost' is used, -and if remoteport is not given, then 25 is used. -""" - -# Overview: -# -# This file implements the minimal SMTP protocol as defined in RFC 821. It -# has a hierarchy of classes which implement the backend functionality for the -# smtpd. A number of classes are provided: -# -# SMTPServer - the base class for the backend. Raises NotImplementedError -# if you try to use it. -# -# DebuggingServer - simply prints each message it receives on stdout. -# -# PureProxy - Proxies all messages to a real smtpd which does final -# delivery. One known problem with this class is that it doesn't handle -# SMTP errors from the backend server at all. This should be fixed -# (contributions are welcome!). -# -# MailmanProxy - An experimental hack to work with GNU Mailman -# <www.list.org>. Using this server as your real incoming smtpd, your -# mailhost will automatically recognize and accept mail destined to Mailman -# lists when those lists are created. Every message not destined for a list -# gets forwarded to a real backend smtpd, as with PureProxy. Again, errors -# are not handled correctly yet. -# -# Please note that this script requires Python 2.0 -# -# Author: Barry Warsaw <barry@python.org> -# -# TODO: -# -# - support mailbox delivery -# - alias files -# - ESMTP -# - handle error codes from the backend smtpd - -import sys -import os -import errno -import getopt -import time -import socket -import asyncore -import asynchat - -__all__ = ["SMTPServer","DebuggingServer","PureProxy","MailmanProxy"] - -program = sys.argv[0] -__version__ = 'Python SMTP proxy version 0.2' - - -class Devnull: - def write(self, msg): pass - def flush(self): pass - - -DEBUGSTREAM = Devnull() -NEWLINE = '\n' -EMPTYSTRING = '' -COMMASPACE = ', ' - - -def usage(code, msg=''): - print >> sys.stderr, __doc__ % globals() - if msg: - print >> sys.stderr, msg - sys.exit(code) - - -class SMTPChannel(asynchat.async_chat): - COMMAND = 0 - DATA = 1 - - def __init__(self, server, conn, addr): - asynchat.async_chat.__init__(self, conn) - self.__server = server - self.__conn = conn - self.__addr = addr - self.__line = [] - self.__state = self.COMMAND - self.__greeting = 0 - self.__mailfrom = None - self.__rcpttos = [] - self.__data = '' - self.__fqdn = socket.getfqdn() - try: - self.__peer = conn.getpeername() - except socket.error, err: - # a race condition may occur if the other end is closing - # before we can get the peername - self.close() - if err[0] != errno.ENOTCONN: - raise - return - print >> DEBUGSTREAM, 'Peer:', repr(self.__peer) - self.push('220 %s %s' % (self.__fqdn, __version__)) - self.set_terminator('\r\n') - - # Overrides base class for convenience - def push(self, msg): - asynchat.async_chat.push(self, msg + '\r\n') - - # Implementation of base class abstract method - def collect_incoming_data(self, data): - self.__line.append(data) - - # Implementation of base class abstract method - def found_terminator(self): - line = EMPTYSTRING.join(self.__line) - print >> DEBUGSTREAM, 'Data:', repr(line) - self.__line = [] - if self.__state == self.COMMAND: - if not line: - self.push('500 Error: bad syntax') - return - method = None - i = line.find(' ') - if i < 0: - command = line.upper() - arg = None - else: - command = line[:i].upper() - arg = line[i+1:].strip() - method = getattr(self, 'smtp_' + command, None) - if not method: - self.push('502 Error: command "%s" not implemented' % command) - return - method(arg) - return - else: - if self.__state != self.DATA: - self.push('451 Internal confusion') - return - # Remove extraneous carriage returns and de-transparency according - # to RFC 821, Section 4.5.2. - data = [] - for text in line.split('\r\n'): - if text and text[0] == '.': - data.append(text[1:]) - else: - data.append(text) - self.__data = NEWLINE.join(data) - status = self.__server.process_message(self.__peer, - self.__mailfrom, - self.__rcpttos, - self.__data) - self.__rcpttos = [] - self.__mailfrom = None - self.__state = self.COMMAND - self.set_terminator('\r\n') - if not status: - self.push('250 Ok') - else: - self.push(status) - - # SMTP and ESMTP commands - def smtp_HELO(self, arg): - if not arg: - self.push('501 Syntax: HELO hostname') - return - if self.__greeting: - self.push('503 Duplicate HELO/EHLO') - else: - self.__greeting = arg - self.push('250 %s' % self.__fqdn) - - def smtp_NOOP(self, arg): - if arg: - self.push('501 Syntax: NOOP') - else: - self.push('250 Ok') - - def smtp_QUIT(self, arg): - # args is ignored - self.push('221 Bye') - self.close_when_done() - - # factored - def __getaddr(self, keyword, arg): - address = None - keylen = len(keyword) - if arg[:keylen].upper() == keyword: - address = arg[keylen:].strip() - if not address: - pass - elif address[0] == '<' and address[-1] == '>' and address != '<>': - # Addresses can be in the form <person@dom.com> but watch out - # for null address, e.g. <> - address = address[1:-1] - return address - - def smtp_MAIL(self, arg): - print >> DEBUGSTREAM, '===> MAIL', arg - address = self.__getaddr('FROM:', arg) if arg else None - if not address: - self.push('501 Syntax: MAIL FROM:<address>') - return - if self.__mailfrom: - self.push('503 Error: nested MAIL command') - return - self.__mailfrom = address - print >> DEBUGSTREAM, 'sender:', self.__mailfrom - self.push('250 Ok') - - def smtp_RCPT(self, arg): - print >> DEBUGSTREAM, '===> RCPT', arg - if not self.__mailfrom: - self.push('503 Error: need MAIL command') - return - address = self.__getaddr('TO:', arg) if arg else None - if not address: - self.push('501 Syntax: RCPT TO: <address>') - return - self.__rcpttos.append(address) - print >> DEBUGSTREAM, 'recips:', self.__rcpttos - self.push('250 Ok') - - def smtp_RSET(self, arg): - if arg: - self.push('501 Syntax: RSET') - return - # Resets the sender, recipients, and data, but not the greeting - self.__mailfrom = None - self.__rcpttos = [] - self.__data = '' - self.__state = self.COMMAND - self.push('250 Ok') - - def smtp_DATA(self, arg): - if not self.__rcpttos: - self.push('503 Error: need RCPT command') - return - if arg: - self.push('501 Syntax: DATA') - return - self.__state = self.DATA - self.set_terminator('\r\n.\r\n') - self.push('354 End data with <CR><LF>.<CR><LF>') - - -class SMTPServer(asyncore.dispatcher): - def __init__(self, localaddr, remoteaddr): - self._localaddr = localaddr - self._remoteaddr = remoteaddr - asyncore.dispatcher.__init__(self) - try: - self.create_socket(socket.AF_INET, socket.SOCK_STREAM) - # try to re-use a server port if possible - self.set_reuse_addr() - self.bind(localaddr) - self.listen(5) - except: - # cleanup asyncore.socket_map before raising - self.close() - raise - else: - print >> DEBUGSTREAM, \ - '%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % ( - self.__class__.__name__, time.ctime(time.time()), - localaddr, remoteaddr) - - def handle_accept(self): - pair = self.accept() - if pair is not None: - conn, addr = pair - print >> DEBUGSTREAM, 'Incoming connection from %s' % repr(addr) - channel = SMTPChannel(self, conn, addr) - - # API for "doing something useful with the message" - def process_message(self, peer, mailfrom, rcpttos, data): - """Override this abstract method to handle messages from the client. - - peer is a tuple containing (ipaddr, port) of the client that made the - socket connection to our smtp port. - - mailfrom is the raw address the client claims the message is coming - from. - - rcpttos is a list of raw addresses the client wishes to deliver the - message to. - - data is a string containing the entire full text of the message, - headers (if supplied) and all. It has been `de-transparencied' - according to RFC 821, Section 4.5.2. In other words, a line - containing a `.' followed by other text has had the leading dot - removed. - - This function should return None, for a normal `250 Ok' response; - otherwise it returns the desired response string in RFC 821 format. - - """ - raise NotImplementedError - - -class DebuggingServer(SMTPServer): - # Do something with the gathered message - def process_message(self, peer, mailfrom, rcpttos, data): - inheaders = 1 - lines = data.split('\n') - print '---------- MESSAGE FOLLOWS ----------' - for line in lines: - # headers first - if inheaders and not line: - print 'X-Peer:', peer[0] - inheaders = 0 - print line - print '------------ END MESSAGE ------------' - - -class PureProxy(SMTPServer): - def process_message(self, peer, mailfrom, rcpttos, data): - lines = data.split('\n') - # Look for the last header - i = 0 - for line in lines: - if not line: - break - i += 1 - lines.insert(i, 'X-Peer: %s' % peer[0]) - data = NEWLINE.join(lines) - refused = self._deliver(mailfrom, rcpttos, data) - # TBD: what to do with refused addresses? - print >> DEBUGSTREAM, 'we got some refusals:', refused - - def _deliver(self, mailfrom, rcpttos, data): - import smtplib - refused = {} - try: - s = smtplib.SMTP() - s.connect(self._remoteaddr[0], self._remoteaddr[1]) - try: - refused = s.sendmail(mailfrom, rcpttos, data) - finally: - s.quit() - except smtplib.SMTPRecipientsRefused, e: - print >> DEBUGSTREAM, 'got SMTPRecipientsRefused' - refused = e.recipients - except (socket.error, smtplib.SMTPException), e: - print >> DEBUGSTREAM, 'got', e.__class__ - # All recipients were refused. If the exception had an associated - # error code, use it. Otherwise,fake it with a non-triggering - # exception code. - errcode = getattr(e, 'smtp_code', -1) - errmsg = getattr(e, 'smtp_error', 'ignore') - for r in rcpttos: - refused[r] = (errcode, errmsg) - return refused - - -class MailmanProxy(PureProxy): - def process_message(self, peer, mailfrom, rcpttos, data): - from cStringIO import StringIO - from Mailman import Utils - from Mailman import Message - from Mailman import MailList - # If the message is to a Mailman mailing list, then we'll invoke the - # Mailman script directly, without going through the real smtpd. - # Otherwise we'll forward it to the local proxy for disposition. - listnames = [] - for rcpt in rcpttos: - local = rcpt.lower().split('@')[0] - # We allow the following variations on the theme - # listname - # listname-admin - # listname-owner - # listname-request - # listname-join - # listname-leave - parts = local.split('-') - if len(parts) > 2: - continue - listname = parts[0] - if len(parts) == 2: - command = parts[1] - else: - command = '' - if not Utils.list_exists(listname) or command not in ( - '', 'admin', 'owner', 'request', 'join', 'leave'): - continue - listnames.append((rcpt, listname, command)) - # Remove all list recipients from rcpttos and forward what we're not - # going to take care of ourselves. Linear removal should be fine - # since we don't expect a large number of recipients. - for rcpt, listname, command in listnames: - rcpttos.remove(rcpt) - # If there's any non-list destined recipients left, - print >> DEBUGSTREAM, 'forwarding recips:', ' '.join(rcpttos) - if rcpttos: - refused = self._deliver(mailfrom, rcpttos, data) - # TBD: what to do with refused addresses? - print >> DEBUGSTREAM, 'we got refusals:', refused - # Now deliver directly to the list commands - mlists = {} - s = StringIO(data) - msg = Message.Message(s) - # These headers are required for the proper execution of Mailman. All - # MTAs in existence seem to add these if the original message doesn't - # have them. - if not msg.getheader('from'): - msg['From'] = mailfrom - if not msg.getheader('date'): - msg['Date'] = time.ctime(time.time()) - for rcpt, listname, command in listnames: - print >> DEBUGSTREAM, 'sending message to', rcpt - mlist = mlists.get(listname) - if not mlist: - mlist = MailList.MailList(listname, lock=0) - mlists[listname] = mlist - # dispatch on the type of command - if command == '': - # post - msg.Enqueue(mlist, tolist=1) - elif command == 'admin': - msg.Enqueue(mlist, toadmin=1) - elif command == 'owner': - msg.Enqueue(mlist, toowner=1) - elif command == 'request': - msg.Enqueue(mlist, torequest=1) - elif command in ('join', 'leave'): - # TBD: this is a hack! - if command == 'join': - msg['Subject'] = 'subscribe' - else: - msg['Subject'] = 'unsubscribe' - msg.Enqueue(mlist, torequest=1) - - -class Options: - setuid = 1 - classname = 'PureProxy' - - -def parseargs(): - global DEBUGSTREAM - try: - opts, args = getopt.getopt( - sys.argv[1:], 'nVhc:d', - ['class=', 'nosetuid', 'version', 'help', 'debug']) - except getopt.error, e: - usage(1, e) - - options = Options() - for opt, arg in opts: - if opt in ('-h', '--help'): - usage(0) - elif opt in ('-V', '--version'): - print >> sys.stderr, __version__ - sys.exit(0) - elif opt in ('-n', '--nosetuid'): - options.setuid = 0 - elif opt in ('-c', '--class'): - options.classname = arg - elif opt in ('-d', '--debug'): - DEBUGSTREAM = sys.stderr - - # parse the rest of the arguments - if len(args) < 1: - localspec = 'localhost:8025' - remotespec = 'localhost:25' - elif len(args) < 2: - localspec = args[0] - remotespec = 'localhost:25' - elif len(args) < 3: - localspec = args[0] - remotespec = args[1] - else: - usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args)) - - # split into host/port pairs - i = localspec.find(':') - if i < 0: - usage(1, 'Bad local spec: %s' % localspec) - options.localhost = localspec[:i] - try: - options.localport = int(localspec[i+1:]) - except ValueError: - usage(1, 'Bad local port: %s' % localspec) - i = remotespec.find(':') - if i < 0: - usage(1, 'Bad remote spec: %s' % remotespec) - options.remotehost = remotespec[:i] - try: - options.remoteport = int(remotespec[i+1:]) - except ValueError: - usage(1, 'Bad remote port: %s' % remotespec) - return options - - -if __name__ == '__main__': - options = parseargs() - # Become nobody - classname = options.classname - if "." in classname: - lastdot = classname.rfind(".") - mod = __import__(classname[:lastdot], globals(), locals(), [""]) - classname = classname[lastdot+1:] - else: - import __main__ as mod - class_ = getattr(mod, classname) - proxy = class_((options.localhost, options.localport), - (options.remotehost, options.remoteport)) - if options.setuid: - try: - import pwd - except ImportError: - print >> sys.stderr, \ - 'Cannot import module "pwd"; try running with -n option.' - sys.exit(1) - nobody = pwd.getpwnam('nobody')[2] - try: - os.setuid(nobody) - except OSError, e: - if e.errno != errno.EPERM: raise - print >> sys.stderr, \ - 'Cannot setuid "nobody"; try running with -n option.' - sys.exit(1) - try: - asyncore.loop() - except KeyboardInterrupt: - pass |