Current File : //usr/lib/python3/dist-packages/twisted/mail/scripts/mailmail.py
# -*- test-case-name: twisted.mail.test.test_mailmail -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Implementation module for the I{mailmail} command.
"""
import email.utils
import getpass
import os
import sys
from configparser import ConfigParser
from io import StringIO
from twisted.copyright import version
from twisted.internet import reactor
from twisted.logger import Logger, textFileLogObserver
from twisted.mail import smtp
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 BaseException:
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 = StringIO()
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(f"From: {o.sender}\r\n")
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(f"Date: {smtp.rfc822date()}\r\n")
buffer.write(line)
if o.recipientsFromHeaders:
for a in o.excludeAddresses:
try:
o.to.remove(a)
except BaseException:
pass
buffer.seek(0, 0)
o.body = StringIO(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 = StringIO()
failure.printTraceback(file=error)
body = StringIO(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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