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channel_output_email.py
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"""
Output channel that sends emails. Relies on Mandrill, Sendgrid or SMTP to actually send mails.
"""
import settings
import pprint
from twisted.logger import Logger
log = Logger()
import mandrill
import requests
from htmlmin import minify
from httpd_site import env
from channel import OutputChannel
from constants import OUTPUT_CHANNEL_EMAIL
import sendgrid
from sendgrid.helpers.mail import *
from email.MIMEText import MIMEText
import smtplib
try:
# Python 3
import urllib.request as urllib
except ImportError:
# Python 2
import urllib2 as urllib
class EmailOutputChannel(OutputChannel):
CHANNEL = OUTPUT_CHANNEL_EMAIL
DESCRIPTION = 'Canarytoken triggered'
TIME_FORMAT = '%Y-%m-%d %H:%M:%S (UTC)'
def format_report_html(self,):
"""Returns a string containing an incident report in HTML,
suitable for emailing"""
# Use the Flask app context to render the emails
# (this generates the urls + schemes correctly)
rendered_html = env.get_template('emails/notification.html').render(
Title=self.DESCRIPTION,
Intro=self.format_report_intro(),
BasicDetails=self.get_basic_details(),
ManageLink=self.data['manage'],
HistoryLink=self.data['history']
)
return minify(rendered_html)
def format_report_intro(self,):
if self.data['channel'] == 'HTTP' or self.data['channel'] == 'AWS API Key Token':
template = ("An {Type} Canarytoken has been triggered")
else:
template = ("A {Type} Canarytoken has been triggered")
if 'src_ip' in self.data:
template += " by the Source IP {src}.".format(src=self.data['src_ip'])
if self.data['channel'] == 'DNS':
template += "\n\nPlease note that the source IP refers to a DNS server," \
" rather than the host that triggered the token. "
if self.data['channel'] == 'DNS' and self.data.get('tokentype') == "my_sql":
template = ("Your MySQL token was tripped, but the attackers machine was unable to connect " +
"to the server directly. Instead, we can tell that it happened, and merely report " +
"on their DNS server. Source IP therefore refers to the DNS server used by the attacker.")
return template.format(
Type=self.data['channel'])
def get_basic_details(self,):
vars = { 'Description' : self.data['description'],
'Channel' : self.data['channel'],
'Time' : self.data['time'],
'Canarytoken' : self.data['canarytoken']
}
if 'src_ip' in self.data:
vars['src_ip'] = self.data['src_ip']
vars['SourceIP'] = self.data['src_ip']
if 'useragent' in self.data:
vars['User-Agent'] = self.data['useragent']
if 'tokentype' in self.data:
vars['TokenType'] = self.data['tokentype']
if 'referer' in self.data:
vars['Referer'] = self.data['referer']
if 'location' in self.data:
try:
vars['Location'] = self.data['location'].decode('utf-8')
except Exception:
vars['Location'] = self.data['location']
if 'log4_shell_computer_name' in self.data:
vars['Log4JComputerName'] = self.data['log4_shell_computer_name']
return vars
def do_send_alert(self, input_channel=None, canarydrop=None, **kwargs):
msg = input_channel.format_canaryalert(
params={'subject_required':True,
'from_display_required':True,
'from_address_required':True},
canarydrop=canarydrop,
**kwargs)
self.data = msg
if 'type' in canarydrop._drop:
self.data['tokentype'] = canarydrop._drop['type']
self.data['canarytoken'] = canarydrop['canarytoken']
self.data['description'] = unicode(canarydrop['memo'], "utf8") if canarydrop['memo'] is not None else ''
if settings.MAILGUN_DOMAIN_NAME and settings.MAILGUN_API_KEY:
self.mailgun_send(msg=msg,canarydrop=canarydrop)
elif settings.MANDRILL_API_KEY:
self.mandrill_send(msg=msg,canarydrop=canarydrop)
elif settings.SENDGRID_API_KEY:
self.sendgrid_send(msg=msg,canarydrop=canarydrop)
elif settings.SMTP_SERVER:
self.smtp_send(msg=msg,canarydrop=canarydrop)
else:
log.error("No email settings found")
def mailgun_send(self, msg=None, canarydrop=None):
try:
base_url = 'https://api.mailgun.net'
if settings.MAILGUN_BASE_URL:
base_url = settings.MAILGUN_BASE_URL
url = '{}/v3/{}/messages'.format(base_url, settings.MAILGUN_DOMAIN_NAME)
auth = ('api', settings.MAILGUN_API_KEY)
data = {
'from': '{name} <{address}>'.format(name=msg['from_display'],address=msg['from_address']),
'to': canarydrop['alert_email_recipient'],
'subject': msg['subject'],
'text': msg['body'],
'html': self.format_report_html()
}
if settings.DEBUG:
pprint.pprint(data)
else:
result = requests.post(url, auth=auth, data=data)
#Raise an error if the returned status is 4xx or 5xx
result.raise_for_status()
log.info('Sent alert to {recipient} for token {token}'\
.format(recipient=canarydrop['alert_email_recipient'],
token=canarydrop.canarytoken.value()))
except requests.exceptions.HTTPError as e:
log.error('A mailgun error occurred: %s - %s' % (e.__class__, e))
def mandrill_send(self, msg=None, canarydrop=None):
try:
mandrill_client = mandrill.Mandrill(settings.MANDRILL_API_KEY)
message = {
'auto_html': None,
'auto_text': None,
'from_email': msg['from_address'],
'from_name': msg['from_display'],
'text': msg['body'],
'html':self.format_report_html(),
'subject': msg['subject'],
'to': [{'email': canarydrop['alert_email_recipient'],
'name': '',
'type': 'to'}],
}
if settings.DEBUG:
pprint.pprint(message)
else:
result = mandrill_client.messages.send(message=message,
async=False,
ip_pool='Main Pool')
log.info('Sent alert to {recipient} for token {token}'\
.format(recipient=canarydrop['alert_email_recipient'],
token=canarydrop.canarytoken.value()))
except mandrill.Error, e:
# Mandrill errors are thrown as exceptions
log.error('A mandrill error occurred: %s - %s' % (e.__class__, e))
# A mandrill error occurred: <class 'mandrill.UnknownSubaccountError'> - No subaccount exists with the id 'customer-123'....
def sendgrid_send(self, msg=None, canarydrop=None):
try:
sg = sendgrid.SendGridAPIClient(apikey=settings.SENDGRID_API_KEY)
from_email = Email(msg['from_address'], msg['from_display'])
subject = msg['subject']
to_email = Email(canarydrop['alert_email_recipient'])
text = msg['body']
content = Content("text/html", self.format_report_html())
mail = Mail(from_email, subject, to_email, content)
if settings.DEBUG:
pprint.pprint(mail)
else:
response = sg.client.mail.send.post(request_body=mail.get())
log.info('Sent alert to {recipient} for token {token}'\
.format(recipient=canarydrop['alert_email_recipient'],
token=canarydrop.canarytoken.value()))
except urllib.HTTPError as e:
log.error('A sendgrid error occurred: %s - %s' % (e.__class__, e))
def smtp_send(self, msg=None, canarydrop=None):
try:
fromaddr = msg['from_address']
toaddr = canarydrop['alert_email_recipient']
smtpmsg = MIMEText(msg['body'])
smtpmsg['From'] = fromaddr
smtpmsg['To'] = toaddr
smtpmsg['Subject'] = msg['subject']
if settings.DEBUG:
pprint.pprint(message)
else:
server = smtplib.SMTP(settings.SMTP_SERVER, settings.SMTP_PORT)
server.ehlo()
server.starttls()
server.ehlo()
server.login(settings.SMTP_USERNAME, settings.SMTP_PASSWORD)
text = smtpmsg.as_string()
server.sendmail(fromaddr, toaddr, text)
log.info('Sent alert to {recipient} for token {token}'\
.format(recipient=canarydrop['alert_email_recipient'],
token=canarydrop.canarytoken.value()))
except smtplib.SMTPException as e:
log.error('A smtp error occurred: %s - %s' % (e.__class__, e))