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# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
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# vi: set ft=python sts=4 ts=4 sw=4 noet :
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# This file is part of Fail2Ban.
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#
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# Fail2Ban is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Fail2Ban is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Fail2Ban; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import socket
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import smtplib
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from email.mime.text import MIMEText
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from email.utils import formatdate, formataddr
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from fail2ban.server.actions import ActionBase, CallingMap
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messages = {}
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messages['start'] = \
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"""Hi,
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The jail %(jailname)s has been started successfully.
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Regards,
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Fail2Ban"""
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messages['stop'] = \
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"""Hi,
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The jail %(jailname)s has been stopped.
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Regards,
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Fail2Ban"""
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messages['ban'] = {}
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messages['ban']['head'] = \
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"""Hi,
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The IP %(ip)s has just been banned for %(bantime)i seconds
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by Fail2Ban after %(failures)i attempts against %(jailname)s.
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"""
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messages['ban']['tail'] = \
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"""
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Regards,
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Fail2Ban"""
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messages['ban']['matches'] = \
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"""
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Matches for this ban:
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%(matches)s
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"""
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messages['ban']['ipmatches'] = \
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"""
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Matches for %(ip)s:
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%(ipmatches)s
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"""
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messages['ban']['ipjailmatches'] = \
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"""
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Matches for %(ip)s for jail %(jailname)s:
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%(ipjailmatches)s
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"""
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class SMTPAction(ActionBase):
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"""Fail2Ban action which sends emails to inform on jail starting,
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stopping and bans.
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"""
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def __init__(
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self, jail, name, host="localhost", user=None, password=None,
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sendername="Fail2Ban", sender="fail2ban", dest="root", matches=None):
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"""Initialise action.
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Parameters
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----------
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jail : Jail
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The jail which the action belongs to.
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name : str
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Named assigned to the action.
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host : str, optional
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SMTP host, of host:port format. Default host "localhost" and
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port "25"
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user : str, optional
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Username used for authentication with SMTP server.
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password : str, optional
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Password used for authentication with SMTP server.
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sendername : str, optional
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Name to use for from address in email. Default "Fail2Ban".
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sender : str, optional
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Email address to use for from address in email.
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Default "fail2ban".
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dest : str, optional
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Email addresses of intended recipient(s) in comma space ", "
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delimited format. Default "root".
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matches : str, optional
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Type of matches to be included from ban in email. Can be one
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of "matches", "ipmatches" or "ipjailmatches". Default None
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(see man jail.conf.5).
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"""
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super(SMTPAction, self).__init__(jail, name)
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self.host = host
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#TODO: self.ssl = ssl
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self.user = user
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self.password =password
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self.fromname = sendername
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self.fromaddr = sender
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self.toaddr = dest
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self.matches = matches
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self.message_values = CallingMap(
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jailname = self._jail.name,
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hostname = socket.gethostname,
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bantime = self._jail.actions.getBanTime,
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)
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def _sendMessage(self, subject, text):
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"""Sends message based on arguments and instance's properties.
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Parameters
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----------
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subject : str
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Subject of the email.
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text : str
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Body of the email.
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Raises
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------
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SMTPConnectionError
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Error on connecting to host.
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SMTPAuthenticationError
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Error authenticating with SMTP server.
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SMTPException
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See Python `smtplib` for full list of other possible
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exceptions.
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"""
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msg = MIMEText(text)
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msg['Subject'] = subject
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msg['From'] = formataddr((self.fromname, self.fromaddr))
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msg['To'] = self.toaddr
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msg['Date'] = formatdate()
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smtp = smtplib.SMTP()
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try:
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self._logSys.debug("Connected to SMTP '%s', response: %i: %s",
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self.host, *smtp.connect(self.host))
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if self.user and self.password:
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smtp.login(self.user, self.password)
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failed_recipients = smtp.sendmail(
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self.fromaddr, self.toaddr.split(", "), msg.as_string())
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except smtplib.SMTPConnectError:
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self._logSys.error("Error connecting to host '%s'", self.host)
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raise
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except smtplib.SMTPAuthenticationError:
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self._logSys.error(
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"Failed to authenticate with host '%s' user '%s'",
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self.host, self.user)
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raise
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except smtplib.SMTPException:
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self._logSys.error(
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"Error sending mail to host '%s' from '%s' to '%s'",
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self.host, self.fromaddr, self.toaddr)
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raise
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else:
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if failed_recipients:
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self._logSys.warning(
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"Email to '%s' failed to following recipients: %r",
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self.toaddr, failed_recipients)
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self._logSys.debug("Email '%s' successfully sent", subject)
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finally:
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try:
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self._logSys.debug("Disconnected from '%s', response %i: %s",
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self.host, *smtp.quit())
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except smtplib.SMTPServerDisconnected:
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pass # Not connected
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def start(self):
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"""Sends email to recipients informing that the jail has started.
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"""
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self._sendMessage(
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"[Fail2Ban] %(jailname)s: started on %(hostname)s" %
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self.message_values,
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messages['start'] % self.message_values)
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def stop(self):
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"""Sends email to recipients informing that the jail has stopped.
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"""
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self._sendMessage(
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"[Fail2Ban] %(jailname)s: stopped on %(hostname)s" %
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self.message_values,
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messages['stop'] % self.message_values)
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def ban(self, aInfo):
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"""Sends email to recipients informing that ban has occurred.
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Parameters
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----------
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aInfo : dict
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Dictionary which includes information in relation to
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the ban.
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"""
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aInfo.update(self.message_values)
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message = "".join([
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messages['ban']['head'],
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messages['ban'].get(self.matches, ""),
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messages['ban']['tail']
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])
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self._sendMessage(
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"[Fail2Ban] %(jailname)s: banned %(ip)s from %(hostname)s" %
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aInfo,
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message % aInfo)
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Action = SMTPAction
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