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# -*- test-case-name: twisted.mail.test.test_mailmail -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Implementation module for the I{mailmail} command.
"""
from __future__ import print_function
import email.utils
import os
import sys
import getpass
try:
# Python 3
from configparser import ConfigParser
except ImportError:
# Python 2
from ConfigParser import ConfigParser
from twisted.copyright import version
from twisted.internet import reactor
from twisted.logger import Logger, textFileLogObserver
from twisted.mail import smtp
from twisted.python.compat import NativeStringIO
GLOBAL_CFG = "/etc/mailmail"
LOCAL_CFG = os.path.expanduser("~/.twisted/mailmail")
SMARTHOST = '127.0.0.1'
ERROR_FMT = """\
Subject: Failed Message Delivery
Message delivery failed. The following occurred:
%s
--
The Twisted sendmail application.
"""
_logObserver = textFileLogObserver(sys.stderr)
_log = Logger(observer=_logObserver)
class Options:
"""
Store the values of the parsed command-line options to the I{mailmail}
script.
@type to: L{list} of L{str}
@ivar to: The addresses to which to deliver this message.
@type sender: L{str}
@ivar sender: The address from which this message is being sent.
@type body: C{file}
@ivar body: The object from which the message is to be read.
"""
def getlogin():
try:
return os.getlogin()
except:
return getpass.getuser()
_unsupportedOption = SystemExit("Unsupported option.")
def parseOptions(argv):
o = Options()
o.to = [e for e in argv if not e.startswith('-')]
o.sender = getlogin()
# Just be very stupid
# Skip -bm -- it is the default
# Add a non-standard option for querying the version of this tool.
if '--version' in argv:
print('mailmail version:', version)
raise SystemExit()
# -bp lists queue information. Screw that.
if '-bp' in argv:
raise _unsupportedOption
# -bs makes sendmail use stdin/stdout as its transport. Screw that.
if '-bs' in argv:
raise _unsupportedOption
# -F sets who the mail is from, but is overridable by the From header
if '-F' in argv:
o.sender = argv[argv.index('-F') + 1]
o.to.remove(o.sender)
# -i and -oi makes us ignore lone "."
if ('-i' in argv) or ('-oi' in argv):
raise _unsupportedOption
# -odb is background delivery
if '-odb' in argv:
o.background = True
else:
o.background = False
# -odf is foreground delivery
if '-odf' in argv:
o.background = False
else:
o.background = True
# -oem and -em cause errors to be mailed back to the sender.
# It is also the default.
# -oep and -ep cause errors to be printed to stderr
if ('-oep' in argv) or ('-ep' in argv):
o.printErrors = True
else:
o.printErrors = False
# -om causes a copy of the message to be sent to the sender if the sender
# appears in an alias expansion. We do not support aliases.
if '-om' in argv:
raise _unsupportedOption
# -t causes us to pick the recipients of the message from
# the To, Cc, and Bcc headers, and to remove the Bcc header
# if present.
if '-t' in argv:
o.recipientsFromHeaders = True
o.excludeAddresses = o.to
o.to = []
else:
o.recipientsFromHeaders = False
o.exludeAddresses = []
requiredHeaders = {
'from': [],
'to': [],
'cc': [],
'bcc': [],
'date': [],
}
buffer = NativeStringIO()
while 1:
write = 1
line = sys.stdin.readline()
if not line.strip():
break
hdrs = line.split(': ', 1)
hdr = hdrs[0].lower()
if o.recipientsFromHeaders and hdr in ('to', 'cc', 'bcc'):
o.to.extend([
email.utils.parseaddr(hdrs[1])[1]
])
if hdr == 'bcc':
write = 0
elif hdr == 'from':
o.sender = email.utils.parseaddr(hdrs[1])[1]
if hdr in requiredHeaders:
requiredHeaders[hdr].append(hdrs[1])
if write:
buffer.write(line)
if not requiredHeaders['from']:
buffer.write('From: {}\r\n'.format(o.sender))
if not requiredHeaders['to']:
if not o.to:
raise SystemExit("No recipients specified.")
buffer.write('To: {}\r\n'.format(', '.join(o.to)))
if not requiredHeaders['date']:
buffer.write('Date: {}\r\n'.format(smtp.rfc822date()))
buffer.write(line)
if o.recipientsFromHeaders:
for a in o.excludeAddresses:
try:
o.to.remove(a)
except:
pass
buffer.seek(0, 0)
o.body = NativeStringIO(buffer.getvalue() + sys.stdin.read())
return o
class Configuration:
"""
@ivar allowUIDs: A list of UIDs which are allowed to send mail.
@ivar allowGIDs: A list of GIDs which are allowed to send mail.
@ivar denyUIDs: A list of UIDs which are not allowed to send mail.
@ivar denyGIDs: A list of GIDs which are not allowed to send mail.
@type defaultAccess: L{bool}
@ivar defaultAccess: L{True} if access will be allowed when no other access
control rule matches or L{False} if it will be denied in that case.
@ivar useraccess: Either C{'allow'} to check C{allowUID} first
or C{'deny'} to check C{denyUID} first.
@ivar groupaccess: Either C{'allow'} to check C{allowGID} first or
C{'deny'} to check C{denyGID} first.
@ivar identities: A L{dict} mapping hostnames to credentials to use when
sending mail to that host.
@ivar smarthost: L{None} or a hostname through which all outgoing mail will
be sent.
@ivar domain: L{None} or the hostname with which to identify ourselves when
connecting to an MTA.
"""
def __init__(self):
self.allowUIDs = []
self.denyUIDs = []
self.allowGIDs = []
self.denyGIDs = []
self.useraccess = 'deny'
self.groupaccess = 'deny'
self.identities = {}
self.smarthost = None
self.domain = None
self.defaultAccess = True
def loadConfig(path):
# [useraccess]
# allow=uid1,uid2,...
# deny=uid1,uid2,...
# order=allow,deny
# [groupaccess]
# allow=gid1,gid2,...
# deny=gid1,gid2,...
# order=deny,allow
# [identity]
# host1=username:password
# host2=username:password
# [addresses]
# smarthost=a.b.c.d
# default_domain=x.y.z
c = Configuration()
if not os.access(path, os.R_OK):
return c
p = ConfigParser()
p.read(path)
au = c.allowUIDs
du = c.denyUIDs
ag = c.allowGIDs
dg = c.denyGIDs
for (section, a, d) in (('useraccess', au, du), ('groupaccess', ag, dg)):
if p.has_section(section):
for (mode, L) in (('allow', a), ('deny', d)):
if p.has_option(section, mode) and p.get(section, mode):
for sectionID in p.get(section, mode).split(','):
try:
sectionID = int(sectionID)
except ValueError:
_log.error(
"Illegal {prefix}ID in "
"[{section}] section: {sectionID}",
prefix=section[0].upper(),
section=section, sectionID=sectionID)
else:
L.append(sectionID)
order = p.get(section, 'order')
order = [s.split()
for s in [s.lower()
for s in order.split(',')]]
if order[0] == 'allow':
setattr(c, section, 'allow')
else:
setattr(c, section, 'deny')
if p.has_section('identity'):
for (host, up) in p.items('identity'):
parts = up.split(':', 1)
if len(parts) != 2:
_log.error("Illegal entry in [identity] section: {section}",
section=up)
continue
c.identities[host] = parts
if p.has_section('addresses'):
if p.has_option('addresses', 'smarthost'):
c.smarthost = p.get('addresses', 'smarthost')
if p.has_option('addresses', 'default_domain'):
c.domain = p.get('addresses', 'default_domain')
return c
def success(result):
reactor.stop()
failed = None
def failure(f):
global failed
reactor.stop()
failed = f
def sendmail(host, options, ident):
d = smtp.sendmail(host, options.sender, options.to, options.body)
d.addCallbacks(success, failure)
reactor.run()
def senderror(failure, options):
recipient = [options.sender]
sender = '"Internally Generated Message ({})"<postmaster@{}>'.format(
sys.argv[0], smtp.DNSNAME.decode("ascii"))
error = NativeStringIO()
failure.printTraceback(file=error)
body = NativeStringIO(ERROR_FMT % error.getvalue())
d = smtp.sendmail('localhost', sender, recipient, body)
d.addBoth(lambda _: reactor.stop())
def deny(conf):
uid = os.getuid()
gid = os.getgid()
if conf.useraccess == 'deny':
if uid in conf.denyUIDs:
return True
if uid in conf.allowUIDs:
return False
else:
if uid in conf.allowUIDs:
return False
if uid in conf.denyUIDs:
return True
if conf.groupaccess == 'deny':
if gid in conf.denyGIDs:
return True
if gid in conf.allowGIDs:
return False
else:
if gid in conf.allowGIDs:
return False
if gid in conf.denyGIDs:
return True
return not conf.defaultAccess
def run():
o = parseOptions(sys.argv[1:])
gConf = loadConfig(GLOBAL_CFG)
lConf = loadConfig(LOCAL_CFG)
if deny(gConf) or deny(lConf):
_log.error("Permission denied")
return
host = lConf.smarthost or gConf.smarthost or SMARTHOST
ident = gConf.identities.copy()
ident.update(lConf.identities)
if lConf.domain:
smtp.DNSNAME = lConf.domain
elif gConf.domain:
smtp.DNSNAME = gConf.domain
sendmail(host, o, ident)
if failed:
if o.printErrors:
failed.printTraceback(file=sys.stderr)
raise SystemExit(1)
else:
senderror(failed, o)
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