mirror of
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141 lines
4.4 KiB
Python
141 lines
4.4 KiB
Python
# Webhooks for external integrations.
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from typing import Any, Dict, Optional, Tuple
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from django.http import HttpRequest, HttpResponse
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from zerver.decorator import webhook_view
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from zerver.lib.request import REQ, has_request_variables
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from zerver.lib.response import json_success
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from zerver.lib.webhooks.common import check_send_webhook_message
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from zerver.models import UserProfile
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def is_canarytoken(message: Dict[str, Any]) -> bool:
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"""
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Requests sent from Thinkst canaries are either from canarytokens or
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canaries, which can be differentiated by the value of the `AlertType`
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field.
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"""
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return message["AlertType"] == "CanarytokenIncident"
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def canary_name(message: Dict[str, Any]) -> str:
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"""
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Returns the name of the canary or canarytoken.
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"""
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if is_canarytoken(message):
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return message["Reminder"]
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else:
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return message["CanaryName"]
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def canary_kind(message: Dict[str, Any]) -> str:
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"""
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Returns a description of the kind of request - canary or canarytoken.
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"""
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if is_canarytoken(message):
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return "canarytoken"
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else:
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return "canary"
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def source_ip_and_reverse_dns(message: Dict[str, Any]) -> Tuple[Optional[str], Optional[str]]:
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"""
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Extract the source IP and reverse DNS information from a canary request.
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"""
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reverse_dns, source_ip = (None, None)
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if "SourceIP" in message:
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source_ip = message["SourceIP"]
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# `ReverseDNS` can sometimes exist and still be empty.
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if "ReverseDNS" in message and message["ReverseDNS"]:
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reverse_dns = message["ReverseDNS"]
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return (source_ip, reverse_dns)
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def body(message: Dict[str, Any]) -> str:
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"""
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Construct the response to a canary or canarytoken request.
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"""
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title = canary_kind(message).title()
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name = canary_name(message)
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body = f"**:alert: {title} *{name}* has been triggered!**\n\n{message['Intro']}\n\n"
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if "IncidentHash" in message:
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body += f"**Incident Id:** `{message['IncidentHash']}`\n"
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if "Token" in message:
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body += f"**Token:** `{message['Token']}`\n"
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if "Description" in message:
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body += f"**Kind:** {message['Description']}\n"
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if "Timestamp" in message:
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body += f"**Timestamp:** {message['Timestamp']}\n"
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if "CanaryIP" in message:
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body += f"**Canary IP:** `{message['CanaryIP']}`\n"
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if "CanaryLocation" in message:
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body += f"**Canary Location:** {message['CanaryLocation']}\n"
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if "Triggered" in message:
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unit = "times" if message["Triggered"] > 1 else "time"
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body += f"**Triggered:** {message['Triggered']} {unit}\n"
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source_ip, reverse_dns = source_ip_and_reverse_dns(message)
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if source_ip:
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body += f"**Source IP:** `{source_ip}`\n"
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if reverse_dns:
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body += f"**Reverse DNS:** `{reverse_dns}`\n"
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if "AdditionalDetails" in message:
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for detail in message["AdditionalDetails"]:
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if isinstance(detail[1], str) and "*" in detail[1]:
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# Thinkst sends passwords as a series of stars which can mess with
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# formatting, so wrap these in backticks.
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body += f"**{detail[0]}:** `{detail[1]}`\n"
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else:
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body += f"**{detail[0]}:** {detail[1]}\n"
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return body
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@webhook_view("Thinkst")
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@has_request_variables
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def api_thinkst_webhook(
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request: HttpRequest,
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user_profile: UserProfile,
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message: Dict[str, Any] = REQ(argument_type="body"),
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user_specified_topic: Optional[str] = REQ("topic", default=None),
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) -> HttpResponse:
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"""
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Construct a response to a webhook event from a Thinkst canary or canarytoken.
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Thinkst offers public canarytokens with canarytokens.org and with their canary
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product, but the schema returned by these identically named services are
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completely different - canarytokens from canarytokens.org are handled by a
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different Zulip integration.
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Thinkst's documentation for the schema is linked below, but in practice the JSON
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received doesn't always conform.
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https://help.canary.tools/hc/en-gb/articles/360002426577-How-do-I-configure-notifications-for-a-Generic-Webhook-
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"""
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response = body(message)
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topic = None
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if user_specified_topic:
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topic = user_specified_topic
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else:
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name = canary_name(message)
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kind = canary_kind(message)
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topic = f"{kind} alert - {name}"
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check_send_webhook_message(request, user_profile, topic, response)
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return json_success()
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