| 1 | #! /usr/bin/env python
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| 2 | """An RFC 2821 smtp proxy.
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| 3 |
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| 4 | Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]]
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| 5 |
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| 6 | Options:
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| 7 |
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| 8 | --nosetuid
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| 9 | -n
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| 10 | This program generally tries to setuid `nobody', unless this flag is
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| 11 | set. The setuid call will fail if this program is not run as root (in
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| 12 | which case, use this flag).
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| 13 |
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| 14 | --version
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| 15 | -V
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| 16 | Print the version number and exit.
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| 17 |
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| 18 | --class classname
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| 19 | -c classname
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| 20 | Use `classname' as the concrete SMTP proxy class. Uses `PureProxy' by
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| 21 | default.
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| 22 |
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| 23 | --debug
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| 24 | -d
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| 25 | Turn on debugging prints.
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| 26 |
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| 27 | --help
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| 28 | -h
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| 29 | Print this message and exit.
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| 30 |
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| 31 | Version: %(__version__)s
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| 32 |
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| 33 | If localhost is not given then `localhost' is used, and if localport is not
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| 34 | given then 8025 is used. If remotehost is not given then `localhost' is used,
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| 35 | and if remoteport is not given, then 25 is used.
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| 36 | """
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| 37 |
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| 38 | # Overview:
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| 39 | #
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| 40 | # This file implements the minimal SMTP protocol as defined in RFC 821. It
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| 41 | # has a hierarchy of classes which implement the backend functionality for the
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| 42 | # smtpd. A number of classes are provided:
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| 43 | #
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| 44 | # SMTPServer - the base class for the backend. Raises NotImplementedError
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| 45 | # if you try to use it.
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| 46 | #
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| 47 | # DebuggingServer - simply prints each message it receives on stdout.
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| 48 | #
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| 49 | # PureProxy - Proxies all messages to a real smtpd which does final
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| 50 | # delivery. One known problem with this class is that it doesn't handle
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| 51 | # SMTP errors from the backend server at all. This should be fixed
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| 52 | # (contributions are welcome!).
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| 53 | #
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| 54 | # MailmanProxy - An experimental hack to work with GNU Mailman
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| 55 | # <www.list.org>. Using this server as your real incoming smtpd, your
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| 56 | # mailhost will automatically recognize and accept mail destined to Mailman
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| 57 | # lists when those lists are created. Every message not destined for a list
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| 58 | # gets forwarded to a real backend smtpd, as with PureProxy. Again, errors
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| 59 | # are not handled correctly yet.
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| 60 | #
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| 61 | # Please note that this script requires Python 2.0
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| 62 | #
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| 63 | # Author: Barry Warsaw <barry@python.org>
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| 64 | #
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| 65 | # TODO:
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| 66 | #
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| 67 | # - support mailbox delivery
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| 68 | # - alias files
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| 69 | # - ESMTP
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| 70 | # - handle error codes from the backend smtpd
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| 71 |
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| 72 | import sys
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| 73 | import os
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| 74 | import errno
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| 75 | import getopt
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| 76 | import time
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| 77 | import socket
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| 78 | import asyncore
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| 79 | import asynchat
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| 80 |
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| 81 | __all__ = ["SMTPServer","DebuggingServer","PureProxy","MailmanProxy"]
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| 82 |
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| 83 | program = sys.argv[0]
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| 84 | __version__ = 'Python SMTP proxy version 0.2'
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| 85 |
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| 86 |
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| 87 | class Devnull:
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| 88 | def write(self, msg): pass
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| 89 | def flush(self): pass
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| 90 |
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| 91 |
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| 92 | DEBUGSTREAM = Devnull()
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| 93 | NEWLINE = '\n'
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| 94 | EMPTYSTRING = ''
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| 95 | COMMASPACE = ', '
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| 96 |
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| 97 |
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| 98 | def usage(code, msg=''):
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| 99 | print >> sys.stderr, __doc__ % globals()
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| 100 | if msg:
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| 101 | print >> sys.stderr, msg
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| 102 | sys.exit(code)
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| 103 |
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| 104 |
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| 105 | class SMTPChannel(asynchat.async_chat):
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| 106 | COMMAND = 0
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| 107 | DATA = 1
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| 108 |
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| 109 | def __init__(self, server, conn, addr):
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| 110 | asynchat.async_chat.__init__(self, conn)
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| 111 | self.__server = server
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| 112 | self.__conn = conn
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| 113 | self.__addr = addr
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| 114 | self.__line = []
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| 115 | self.__state = self.COMMAND
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| 116 | self.__greeting = 0
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| 117 | self.__mailfrom = None
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| 118 | self.__rcpttos = []
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| 119 | self.__data = ''
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| 120 | self.__fqdn = socket.getfqdn()
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| 121 | try:
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| 122 | self.__peer = conn.getpeername()
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| 123 | except socket.error, err:
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| 124 | # a race condition may occur if the other end is closing
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| 125 | # before we can get the peername
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| 126 | self.close()
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| 127 | if err[0] != errno.ENOTCONN:
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| 128 | raise
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| 129 | return
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| 130 | print >> DEBUGSTREAM, 'Peer:', repr(self.__peer)
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| 131 | self.push('220 %s %s' % (self.__fqdn, __version__))
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| 132 | self.set_terminator('\r\n')
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| 133 |
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| 134 | # Overrides base class for convenience
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| 135 | def push(self, msg):
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| 136 | asynchat.async_chat.push(self, msg + '\r\n')
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| 137 |
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| 138 | # Implementation of base class abstract method
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| 139 | def collect_incoming_data(self, data):
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| 140 | self.__line.append(data)
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| 141 |
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| 142 | # Implementation of base class abstract method
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| 143 | def found_terminator(self):
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| 144 | line = EMPTYSTRING.join(self.__line)
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| 145 | print >> DEBUGSTREAM, 'Data:', repr(line)
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| 146 | self.__line = []
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| 147 | if self.__state == self.COMMAND:
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| 148 | if not line:
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| 149 | self.push('500 Error: bad syntax')
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| 150 | return
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| 151 | method = None
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| 152 | i = line.find(' ')
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| 153 | if i < 0:
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| 154 | command = line.upper()
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| 155 | arg = None
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| 156 | else:
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| 157 | command = line[:i].upper()
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| 158 | arg = line[i+1:].strip()
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| 159 | method = getattr(self, 'smtp_' + command, None)
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| 160 | if not method:
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| 161 | self.push('502 Error: command "%s" not implemented' % command)
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| 162 | return
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| 163 | method(arg)
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| 164 | return
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| 165 | else:
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| 166 | if self.__state != self.DATA:
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| 167 | self.push('451 Internal confusion')
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| 168 | return
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| 169 | # Remove extraneous carriage returns and de-transparency according
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| 170 | # to RFC 821, Section 4.5.2.
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| 171 | data = []
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| 172 | for text in line.split('\r\n'):
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| 173 | if text and text[0] == '.':
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| 174 | data.append(text[1:])
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| 175 | else:
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| 176 | data.append(text)
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| 177 | self.__data = NEWLINE.join(data)
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| 178 | status = self.__server.process_message(self.__peer,
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| 179 | self.__mailfrom,
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| 180 | self.__rcpttos,
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| 181 | self.__data)
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| 182 | self.__rcpttos = []
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| 183 | self.__mailfrom = None
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| 184 | self.__state = self.COMMAND
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| 185 | self.set_terminator('\r\n')
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| 186 | if not status:
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| 187 | self.push('250 Ok')
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| 188 | else:
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| 189 | self.push(status)
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| 190 |
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| 191 | # SMTP and ESMTP commands
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| 192 | def smtp_HELO(self, arg):
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| 193 | if not arg:
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| 194 | self.push('501 Syntax: HELO hostname')
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| 195 | return
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| 196 | if self.__greeting:
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| 197 | self.push('503 Duplicate HELO/EHLO')
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| 198 | else:
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| 199 | self.__greeting = arg
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| 200 | self.push('250 %s' % self.__fqdn)
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| 201 |
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| 202 | def smtp_NOOP(self, arg):
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| 203 | if arg:
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| 204 | self.push('501 Syntax: NOOP')
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| 205 | else:
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| 206 | self.push('250 Ok')
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| 207 |
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| 208 | def smtp_QUIT(self, arg):
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| 209 | # args is ignored
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| 210 | self.push('221 Bye')
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| 211 | self.close_when_done()
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| 212 |
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| 213 | # factored
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| 214 | def __getaddr(self, keyword, arg):
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| 215 | address = None
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| 216 | keylen = len(keyword)
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| 217 | if arg[:keylen].upper() == keyword:
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| 218 | address = arg[keylen:].strip()
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| 219 | if not address:
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| 220 | pass
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| 221 | elif address[0] == '<' and address[-1] == '>' and address != '<>':
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| 222 | # Addresses can be in the form <person@dom.com> but watch out
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| 223 | # for null address, e.g. <>
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| 224 | address = address[1:-1]
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| 225 | return address
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| 226 |
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| 227 | def smtp_MAIL(self, arg):
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| 228 | print >> DEBUGSTREAM, '===> MAIL', arg
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| 229 | address = self.__getaddr('FROM:', arg) if arg else None
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| 230 | if not address:
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| 231 | self.push('501 Syntax: MAIL FROM:<address>')
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| 232 | return
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| 233 | if self.__mailfrom:
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| 234 | self.push('503 Error: nested MAIL command')
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| 235 | return
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| 236 | self.__mailfrom = address
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| 237 | print >> DEBUGSTREAM, 'sender:', self.__mailfrom
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| 238 | self.push('250 Ok')
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| 239 |
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| 240 | def smtp_RCPT(self, arg):
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| 241 | print >> DEBUGSTREAM, '===> RCPT', arg
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| 242 | if not self.__mailfrom:
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| 243 | self.push('503 Error: need MAIL command')
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| 244 | return
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| 245 | address = self.__getaddr('TO:', arg) if arg else None
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| 246 | if not address:
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| 247 | self.push('501 Syntax: RCPT TO: <address>')
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| 248 | return
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| 249 | self.__rcpttos.append(address)
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| 250 | print >> DEBUGSTREAM, 'recips:', self.__rcpttos
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| 251 | self.push('250 Ok')
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| 252 |
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| 253 | def smtp_RSET(self, arg):
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| 254 | if arg:
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| 255 | self.push('501 Syntax: RSET')
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| 256 | return
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| 257 | # Resets the sender, recipients, and data, but not the greeting
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| 258 | self.__mailfrom = None
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| 259 | self.__rcpttos = []
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| 260 | self.__data = ''
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| 261 | self.__state = self.COMMAND
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| 262 | self.push('250 Ok')
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| 263 |
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| 264 | def smtp_DATA(self, arg):
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| 265 | if not self.__rcpttos:
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| 266 | self.push('503 Error: need RCPT command')
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| 267 | return
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| 268 | if arg:
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| 269 | self.push('501 Syntax: DATA')
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| 270 | return
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| 271 | self.__state = self.DATA
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| 272 | self.set_terminator('\r\n.\r\n')
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| 273 | self.push('354 End data with <CR><LF>.<CR><LF>')
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| 274 |
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| 275 |
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| 276 | class SMTPServer(asyncore.dispatcher):
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| 277 | def __init__(self, localaddr, remoteaddr):
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| 278 | self._localaddr = localaddr
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| 279 | self._remoteaddr = remoteaddr
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| 280 | asyncore.dispatcher.__init__(self)
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| 281 | try:
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| 282 | self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
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| 283 | # try to re-use a server port if possible
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| 284 | self.set_reuse_addr()
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| 285 | self.bind(localaddr)
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| 286 | self.listen(5)
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| 287 | except:
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| 288 | # cleanup asyncore.socket_map before raising
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| 289 | self.close()
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| 290 | raise
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| 291 | else:
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| 292 | print >> DEBUGSTREAM, \
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| 293 | '%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % (
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| 294 | self.__class__.__name__, time.ctime(time.time()),
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| 295 | localaddr, remoteaddr)
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| 296 |
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| 297 | def handle_accept(self):
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| 298 | pair = self.accept()
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| 299 | if pair is not None:
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| 300 | conn, addr = pair
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| 301 | print >> DEBUGSTREAM, 'Incoming connection from %s' % repr(addr)
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| 302 | channel = SMTPChannel(self, conn, addr)
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| 303 |
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| 304 | # API for "doing something useful with the message"
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| 305 | def process_message(self, peer, mailfrom, rcpttos, data):
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| 306 | """Override this abstract method to handle messages from the client.
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| 307 |
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| 308 | peer is a tuple containing (ipaddr, port) of the client that made the
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| 309 | socket connection to our smtp port.
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| 310 |
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| 311 | mailfrom is the raw address the client claims the message is coming
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| 312 | from.
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| 313 |
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| 314 | rcpttos is a list of raw addresses the client wishes to deliver the
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| 315 | message to.
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| 316 |
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| 317 | data is a string containing the entire full text of the message,
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| 318 | headers (if supplied) and all. It has been `de-transparencied'
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| 319 | according to RFC 821, Section 4.5.2. In other words, a line
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| 320 | containing a `.' followed by other text has had the leading dot
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| 321 | removed.
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| 322 |
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| 323 | This function should return None, for a normal `250 Ok' response;
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| 324 | otherwise it returns the desired response string in RFC 821 format.
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| 325 |
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| 326 | """
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| 327 | raise NotImplementedError
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| 328 |
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| 329 |
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| 330 | class DebuggingServer(SMTPServer):
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| 331 | # Do something with the gathered message
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| 332 | def process_message(self, peer, mailfrom, rcpttos, data):
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| 333 | inheaders = 1
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| 334 | lines = data.split('\n')
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| 335 | print '---------- MESSAGE FOLLOWS ----------'
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| 336 | for line in lines:
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| 337 | # headers first
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| 338 | if inheaders and not line:
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| 339 | print 'X-Peer:', peer[0]
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| 340 | inheaders = 0
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| 341 | print line
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| 342 | print '------------ END MESSAGE ------------'
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| 343 |
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| 344 |
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| 345 | class PureProxy(SMTPServer):
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| 346 | def process_message(self, peer, mailfrom, rcpttos, data):
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| 347 | lines = data.split('\n')
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| 348 | # Look for the last header
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| 349 | i = 0
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| 350 | for line in lines:
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| 351 | if not line:
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| 352 | break
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| 353 | i += 1
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| 354 | lines.insert(i, 'X-Peer: %s' % peer[0])
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| 355 | data = NEWLINE.join(lines)
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| 356 | refused = self._deliver(mailfrom, rcpttos, data)
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| 357 | # TBD: what to do with refused addresses?
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| 358 | print >> DEBUGSTREAM, 'we got some refusals:', refused
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| 359 |
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| 360 | def _deliver(self, mailfrom, rcpttos, data):
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| 361 | import smtplib
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| 362 | refused = {}
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| 363 | try:
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| 364 | s = smtplib.SMTP()
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| 365 | s.connect(self._remoteaddr[0], self._remoteaddr[1])
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| 366 | try:
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| 367 | refused = s.sendmail(mailfrom, rcpttos, data)
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| 368 | finally:
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| 369 | s.quit()
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| 370 | except smtplib.SMTPRecipientsRefused, e:
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| 371 | print >> DEBUGSTREAM, 'got SMTPRecipientsRefused'
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| 372 | refused = e.recipients
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| 373 | except (socket.error, smtplib.SMTPException), e:
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| 374 | print >> DEBUGSTREAM, 'got', e.__class__
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| 375 | # All recipients were refused. If the exception had an associated
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| 376 | # error code, use it. Otherwise,fake it with a non-triggering
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| 377 | # exception code.
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| 378 | errcode = getattr(e, 'smtp_code', -1)
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| 379 | errmsg = getattr(e, 'smtp_error', 'ignore')
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| 380 | for r in rcpttos:
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| 381 | refused[r] = (errcode, errmsg)
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| 382 | return refused
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| 383 |
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| 384 |
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| 385 | class MailmanProxy(PureProxy):
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| 386 | def process_message(self, peer, mailfrom, rcpttos, data):
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| 387 | from cStringIO import StringIO
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| 388 | from Mailman import Utils
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| 389 | from Mailman import Message
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| 390 | from Mailman import MailList
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| 391 | # If the message is to a Mailman mailing list, then we'll invoke the
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| 392 | # Mailman script directly, without going through the real smtpd.
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| 393 | # Otherwise we'll forward it to the local proxy for disposition.
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| 394 | listnames = []
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| 395 | for rcpt in rcpttos:
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| 396 | local = rcpt.lower().split('@')[0]
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| 397 | # We allow the following variations on the theme
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| 398 | # listname
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| 399 | # listname-admin
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| 400 | # listname-owner
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| 401 | # listname-request
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| 402 | # listname-join
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| 403 | # listname-leave
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| 404 | parts = local.split('-')
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| 405 | if len(parts) > 2:
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| 406 | continue
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| 407 | listname = parts[0]
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| 408 | if len(parts) == 2:
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| 409 | command = parts[1]
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| 410 | else:
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| 411 | command = ''
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| 412 | if not Utils.list_exists(listname) or command not in (
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| 413 | '', 'admin', 'owner', 'request', 'join', 'leave'):
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| 414 | continue
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| 415 | listnames.append((rcpt, listname, command))
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| 416 | # Remove all list recipients from rcpttos and forward what we're not
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| 417 | # going to take care of ourselves. Linear removal should be fine
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| 418 | # since we don't expect a large number of recipients.
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| 419 | for rcpt, listname, command in listnames:
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| 420 | rcpttos.remove(rcpt)
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| 421 | # If there's any non-list destined recipients left,
|
|---|
| 422 | print >> DEBUGSTREAM, 'forwarding recips:', ' '.join(rcpttos)
|
|---|
| 423 | if rcpttos:
|
|---|
| 424 | refused = self._deliver(mailfrom, rcpttos, data)
|
|---|
| 425 | # TBD: what to do with refused addresses?
|
|---|
| 426 | print >> DEBUGSTREAM, 'we got refusals:', refused
|
|---|
| 427 | # Now deliver directly to the list commands
|
|---|
| 428 | mlists = {}
|
|---|
| 429 | s = StringIO(data)
|
|---|
| 430 | msg = Message.Message(s)
|
|---|
| 431 | # These headers are required for the proper execution of Mailman. All
|
|---|
| 432 | # MTAs in existence seem to add these if the original message doesn't
|
|---|
| 433 | # have them.
|
|---|
| 434 | if not msg.getheader('from'):
|
|---|
| 435 | msg['From'] = mailfrom
|
|---|
| 436 | if not msg.getheader('date'):
|
|---|
| 437 | msg['Date'] = time.ctime(time.time())
|
|---|
| 438 | for rcpt, listname, command in listnames:
|
|---|
| 439 | print >> DEBUGSTREAM, 'sending message to', rcpt
|
|---|
| 440 | mlist = mlists.get(listname)
|
|---|
| 441 | if not mlist:
|
|---|
| 442 | mlist = MailList.MailList(listname, lock=0)
|
|---|
| 443 | mlists[listname] = mlist
|
|---|
| 444 | # dispatch on the type of command
|
|---|
| 445 | if command == '':
|
|---|
| 446 | # post
|
|---|
| 447 | msg.Enqueue(mlist, tolist=1)
|
|---|
| 448 | elif command == 'admin':
|
|---|
| 449 | msg.Enqueue(mlist, toadmin=1)
|
|---|
| 450 | elif command == 'owner':
|
|---|
| 451 | msg.Enqueue(mlist, toowner=1)
|
|---|
| 452 | elif command == 'request':
|
|---|
| 453 | msg.Enqueue(mlist, torequest=1)
|
|---|
| 454 | elif command in ('join', 'leave'):
|
|---|
| 455 | # TBD: this is a hack!
|
|---|
| 456 | if command == 'join':
|
|---|
| 457 | msg['Subject'] = 'subscribe'
|
|---|
| 458 | else:
|
|---|
| 459 | msg['Subject'] = 'unsubscribe'
|
|---|
| 460 | msg.Enqueue(mlist, torequest=1)
|
|---|
| 461 |
|
|---|
| 462 |
|
|---|
| 463 | class Options:
|
|---|
| 464 | setuid = 1
|
|---|
| 465 | classname = 'PureProxy'
|
|---|
| 466 |
|
|---|
| 467 |
|
|---|
| 468 | def parseargs():
|
|---|
| 469 | global DEBUGSTREAM
|
|---|
| 470 | try:
|
|---|
| 471 | opts, args = getopt.getopt(
|
|---|
| 472 | sys.argv[1:], 'nVhc:d',
|
|---|
| 473 | ['class=', 'nosetuid', 'version', 'help', 'debug'])
|
|---|
| 474 | except getopt.error, e:
|
|---|
| 475 | usage(1, e)
|
|---|
| 476 |
|
|---|
| 477 | options = Options()
|
|---|
| 478 | for opt, arg in opts:
|
|---|
| 479 | if opt in ('-h', '--help'):
|
|---|
| 480 | usage(0)
|
|---|
| 481 | elif opt in ('-V', '--version'):
|
|---|
| 482 | print >> sys.stderr, __version__
|
|---|
| 483 | sys.exit(0)
|
|---|
| 484 | elif opt in ('-n', '--nosetuid'):
|
|---|
| 485 | options.setuid = 0
|
|---|
| 486 | elif opt in ('-c', '--class'):
|
|---|
| 487 | options.classname = arg
|
|---|
| 488 | elif opt in ('-d', '--debug'):
|
|---|
| 489 | DEBUGSTREAM = sys.stderr
|
|---|
| 490 |
|
|---|
| 491 | # parse the rest of the arguments
|
|---|
| 492 | if len(args) < 1:
|
|---|
| 493 | localspec = 'localhost:8025'
|
|---|
| 494 | remotespec = 'localhost:25'
|
|---|
| 495 | elif len(args) < 2:
|
|---|
| 496 | localspec = args[0]
|
|---|
| 497 | remotespec = 'localhost:25'
|
|---|
| 498 | elif len(args) < 3:
|
|---|
| 499 | localspec = args[0]
|
|---|
| 500 | remotespec = args[1]
|
|---|
| 501 | else:
|
|---|
| 502 | usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args))
|
|---|
| 503 |
|
|---|
| 504 | # split into host/port pairs
|
|---|
| 505 | i = localspec.find(':')
|
|---|
| 506 | if i < 0:
|
|---|
| 507 | usage(1, 'Bad local spec: %s' % localspec)
|
|---|
| 508 | options.localhost = localspec[:i]
|
|---|
| 509 | try:
|
|---|
| 510 | options.localport = int(localspec[i+1:])
|
|---|
| 511 | except ValueError:
|
|---|
| 512 | usage(1, 'Bad local port: %s' % localspec)
|
|---|
| 513 | i = remotespec.find(':')
|
|---|
| 514 | if i < 0:
|
|---|
| 515 | usage(1, 'Bad remote spec: %s' % remotespec)
|
|---|
| 516 | options.remotehost = remotespec[:i]
|
|---|
| 517 | try:
|
|---|
| 518 | options.remoteport = int(remotespec[i+1:])
|
|---|
| 519 | except ValueError:
|
|---|
| 520 | usage(1, 'Bad remote port: %s' % remotespec)
|
|---|
| 521 | return options
|
|---|
| 522 |
|
|---|
| 523 |
|
|---|
| 524 | if __name__ == '__main__':
|
|---|
| 525 | options = parseargs()
|
|---|
| 526 | # Become nobody
|
|---|
| 527 | classname = options.classname
|
|---|
| 528 | if "." in classname:
|
|---|
| 529 | lastdot = classname.rfind(".")
|
|---|
| 530 | mod = __import__(classname[:lastdot], globals(), locals(), [""])
|
|---|
| 531 | classname = classname[lastdot+1:]
|
|---|
| 532 | else:
|
|---|
| 533 | import __main__ as mod
|
|---|
| 534 | class_ = getattr(mod, classname)
|
|---|
| 535 | proxy = class_((options.localhost, options.localport),
|
|---|
| 536 | (options.remotehost, options.remoteport))
|
|---|
| 537 | if options.setuid:
|
|---|
| 538 | try:
|
|---|
| 539 | import pwd
|
|---|
| 540 | except ImportError:
|
|---|
| 541 | print >> sys.stderr, \
|
|---|
| 542 | 'Cannot import module "pwd"; try running with -n option.'
|
|---|
| 543 | sys.exit(1)
|
|---|
| 544 | nobody = pwd.getpwnam('nobody')[2]
|
|---|
| 545 | try:
|
|---|
| 546 | os.setuid(nobody)
|
|---|
| 547 | except OSError, e:
|
|---|
| 548 | if e.errno != errno.EPERM: raise
|
|---|
| 549 | print >> sys.stderr, \
|
|---|
| 550 | 'Cannot setuid "nobody"; try running with -n option.'
|
|---|
| 551 | sys.exit(1)
|
|---|
| 552 | try:
|
|---|
| 553 | asyncore.loop()
|
|---|
| 554 | except KeyboardInterrupt:
|
|---|
| 555 | pass
|
|---|
