298 lines
9.2 KiB
Python
298 lines
9.2 KiB
Python
"""
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.. module: lemur.notifications.messaging
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:platform: Unix
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:copyright: (c) 2018 by Netflix Inc., see AUTHORS for more
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:license: Apache, see LICENSE for more details.
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.. moduleauthor:: Kevin Glisson <kglisson@netflix.com>
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"""
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import sys
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from collections import defaultdict
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from datetime import timedelta
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from itertools import groupby
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import arrow
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from flask import current_app
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from sqlalchemy import and_
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from sqlalchemy.sql.expression import false, true
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from lemur import database
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from lemur.certificates.models import Certificate
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from lemur.certificates.schemas import certificate_notification_output_schema
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from lemur.common.utils import windowed_query
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from lemur.constants import FAILURE_METRIC_STATUS, SUCCESS_METRIC_STATUS
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from lemur.extensions import metrics, sentry
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from lemur.pending_certificates.schemas import pending_certificate_output_schema
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from lemur.plugins import plugins
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from lemur.plugins.utils import get_plugin_option
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def get_certificates(exclude=None):
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"""
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Finds all certificates that are eligible for expiration notifications.
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:param exclude:
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:return:
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"""
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now = arrow.utcnow()
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max = now + timedelta(days=90)
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q = (
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database.db.session.query(Certificate)
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.filter(Certificate.not_after <= max)
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.filter(Certificate.notify == true())
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.filter(Certificate.expired == false())
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.filter(Certificate.revoked == false())
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)
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exclude_conditions = []
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if exclude:
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for e in exclude:
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exclude_conditions.append(~Certificate.name.ilike("%{}%".format(e)))
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q = q.filter(and_(*exclude_conditions))
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certs = []
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for c in windowed_query(q, Certificate.id, 10000):
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if needs_notification(c):
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certs.append(c)
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return certs
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def get_eligible_certificates(exclude=None):
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"""
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Finds all certificates that are eligible for certificate expiration notification.
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Returns the set of all eligible certificates, grouped by owner, with a list of applicable notifications.
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:param exclude:
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:return:
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"""
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certificates = defaultdict(dict)
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certs = get_certificates(exclude=exclude)
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# group by owner
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for owner, items in groupby(certs, lambda x: x.owner):
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notification_groups = []
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for certificate in items:
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notifications = needs_notification(certificate)
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if notifications:
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for notification in notifications:
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notification_groups.append((notification, certificate))
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# group by notification
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for notification, items in groupby(notification_groups, lambda x: x[0].label):
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certificates[owner][notification] = list(items)
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return certificates
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def send_plugin_notification(event_type, data, recipients, notification):
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"""
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Executes the plugin and handles failure.
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:param event_type:
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:param data:
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:param recipients:
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:param notification:
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:return:
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"""
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function = f"{__name__}.{sys._getframe().f_code.co_name}"
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log_data = {
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"function": function,
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"message": f"Sending expiration notification for to recipients {recipients}",
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"notification_type": "expiration",
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"certificate_targets": recipients,
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}
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status = FAILURE_METRIC_STATUS
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try:
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current_app.logger.debug(log_data)
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notification.plugin.send(event_type, data, recipients, notification.options)
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status = SUCCESS_METRIC_STATUS
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except Exception as e:
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log_data["message"] = f"Unable to send {event_type} notification to recipients {recipients}"
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current_app.logger.error(log_data, exc_info=True)
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sentry.captureException()
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metrics.send(
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"notification",
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"counter",
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1,
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metric_tags={"status": status, "event_type": event_type},
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)
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if status == SUCCESS_METRIC_STATUS:
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return True
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def send_expiration_notifications(exclude):
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"""
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This function will check for upcoming certificate expiration,
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and send out notification emails at given intervals.
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"""
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success = failure = 0
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# security team gets all
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security_email = current_app.config.get("LEMUR_SECURITY_TEAM_EMAIL")
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for owner, notification_group in get_eligible_certificates(exclude=exclude).items():
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for notification_label, certificates in notification_group.items():
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notification_data = []
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security_data = []
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notification = certificates[0][0]
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for data in certificates:
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n, certificate = data
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cert_data = certificate_notification_output_schema.dump(
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certificate
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).data
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notification_data.append(cert_data)
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security_data.append(cert_data)
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if send_default_notification(
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"expiration", notification_data, [owner], notification.options
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):
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success += 1
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else:
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failure += 1
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recipients = notification.plugin.filter_recipients(notification.options, security_email + [owner])
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if send_plugin_notification(
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"expiration",
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notification_data,
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recipients,
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notification,
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):
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success += 1
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else:
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failure += 1
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if send_default_notification(
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"expiration", security_data, security_email, notification.options
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):
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success += 1
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else:
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failure += 1
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return success, failure
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def send_default_notification(notification_type, data, targets, notification_options=None):
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"""
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Sends a report to the specified target via the default notification plugin. Applicable for any notification_type.
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At present, "default" means email, as the other notification plugins do not support dynamically configured targets.
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:param notification_type:
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:param data:
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:param targets:
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:param notification_options:
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:return:
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"""
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function = f"{__name__}.{sys._getframe().f_code.co_name}"
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log_data = {
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"function": function,
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"message": f"Sending notification for certificate data {data}",
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"notification_type": notification_type,
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}
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status = FAILURE_METRIC_STATUS
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notification_plugin = plugins.get(
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current_app.config.get("LEMUR_DEFAULT_NOTIFICATION_PLUGIN", "email-notification")
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)
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try:
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current_app.logger.debug(log_data)
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# we need the notification.options here because the email templates utilize the interval/unit info
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notification_plugin.send(notification_type, data, targets, notification_options)
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status = SUCCESS_METRIC_STATUS
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except Exception as e:
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log_data["message"] = f"Unable to send {notification_type} notification for certificate data {data} " \
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f"to target {targets}"
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current_app.logger.error(log_data, exc_info=True)
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sentry.captureException()
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metrics.send(
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"notification",
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"counter",
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1,
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metric_tags={"status": status, "event_type": notification_type},
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)
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if status == SUCCESS_METRIC_STATUS:
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return True
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def send_rotation_notification(certificate):
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data = certificate_notification_output_schema.dump(certificate).data
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return send_default_notification("rotation", data, [data["owner"]])
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def send_pending_failure_notification(
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pending_cert, notify_owner=True, notify_security=True
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):
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"""
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Sends a report to certificate owners when their pending certificate failed to be created.
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:param pending_cert:
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:param notify_owner:
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:param notify_security:
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:return:
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"""
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data = pending_certificate_output_schema.dump(pending_cert).data
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data["security_email"] = current_app.config.get("LEMUR_SECURITY_TEAM_EMAIL")
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notify_owner_success = False
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if notify_owner:
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notify_owner_success = send_default_notification("failed", data, [data["owner"]], pending_cert)
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notify_security_success = False
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if notify_security:
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notify_security_success = send_default_notification("failed", data, data["security_email"], pending_cert)
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return notify_owner_success or notify_security_success
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def needs_notification(certificate):
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"""
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Determine if notifications for a given certificate should currently be sent.
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For each notification configured for the cert, verifies it is active, properly configured,
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and that the configured expiration period is currently met.
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:param certificate:
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:return:
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"""
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now = arrow.utcnow()
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days = (certificate.not_after - now).days
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notifications = []
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for notification in certificate.notifications:
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if not notification.active or not notification.options:
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continue
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interval = get_plugin_option("interval", notification.options)
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unit = get_plugin_option("unit", notification.options)
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if unit == "weeks":
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interval *= 7
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elif unit == "months":
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interval *= 30
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elif unit == "days": # it's nice to be explicit about the base unit
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pass
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else:
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raise Exception(
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f"Invalid base unit for expiration interval: {unit}"
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)
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if days == interval:
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notifications.append(notification)
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return notifications
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