| 1 | import json |
| 2 | import os |
| 3 | |
| 4 | from fastapi import APIRouter |
| 5 | from fastapi import Depends |
| 6 | from fastapi import Header |
| 7 | from fastapi import HTTPException |
| 8 | from loguru import logger |
| 9 | |
| 10 | from app.active_response.schema.active_response import InvokeActiveResponseResponse |
| 11 | from app.active_response.schema.graylog import GraylogEventNotification |
| 12 | from app.connectors.wazuh_manager.utils.universal import send_put_request |
| 13 | |
| 14 | active_response_graylog_router = APIRouter() |
| 15 | |
| 16 | |
| 17 | # Function to validate the Graylog header |
| 18 | async def verify_graylog_header(graylog: str = Header(None)): |
| 19 | """Verify that the request has the correct Graylog header.""" |
| 20 | # Get the header value from environment variable or use "ab73de7a-6f61-4dde-87cd-3af5175a7281" as default |
| 21 | expected_header = os.getenv("GRAYLOG_API_HEADER_VALUE", "ab73de7a-6f61-4dde-87cd-3af5175a7281") |
| 22 | |
| 23 | if graylog != expected_header: |
| 24 | logger.error("Invalid or missing Graylog header") |
| 25 | raise HTTPException(status_code=403, detail="Invalid or missing Graylog header") |
| 26 | return graylog |
| 27 | |
| 28 | |
| 29 | @active_response_graylog_router.post( |
| 30 | "/invoke", |
| 31 | response_model=InvokeActiveResponseResponse, |
| 32 | description="Invoke an active response via a Graylog Alert notification.", |
| 33 | dependencies=[Depends(verify_graylog_header)], |
| 34 | ) |
| 35 | async def invoke_active_response_graylog_route( |
| 36 | request: GraylogEventNotification, |
| 37 | ) -> InvokeActiveResponseResponse: |
| 38 | """ |
| 39 | This route accepts an HTTP Post from Graylog. Required fields are: |
| 40 | 1. Agent ID - The ID of the agent that triggered the alert |
| 41 | 2. Command - The command to execute (i.e. 'dns_block.py') |
| 42 | 3. Arguments - The arguments to pass to the command such as IP addresses, domains, etc. |
| 43 | 4. Required Graylog Event Fields: |
| 44 | COMMAND: str - this is the active response command to execute i.e 'domain_sinkhole' (do not include the '.py') |
| 45 | AGENT_ID: str - the agent ID that triggered the alert |
| 46 | ACTION: str - the action to take i.e 'sinkhole' - this is defined in the python script of the valid actions |
| 47 | VALUE: str - the value to use i.e 'example.com' - this is the value that the action will be taken on |
| 48 | |
| 49 | #### IMPORTANT: IF THE MANAGERS ARE IN A CLUSTER, THE WORKER FOR THE AGENT MUST GET THE COMMAND AND ACTIVE RESPONSE BLOCKS |
| 50 | |
| 51 | Args: |
| 52 | request (InvokeActiveResponseRequest): The request object containing the command, custom, arguments, and alert. |
| 53 | |
| 54 | Returns: |
| 55 | InvokeActiveResponseResponse: The response object indicating the success or failure of the active response invocation. |
| 56 | """ |
| 57 | logger.info("Invoking Wazuh Active Response...") |
| 58 | # Append '0' to the command - This is required for Wazuh Active Response |
| 59 | command = f"{request.event.fields.COMMAND}0" |
| 60 | # Create a dictionary with the request data |
| 61 | # {"endpoint":"active-response","arguments":[],"command":"windows_firewall","custom":true,"alert":{"action":"block","ip":"1.1.1.1"},"params":{"wait_for_complete":true,"agents_list":["086"]}} |
| 62 | |
| 63 | data_dict = {"command": command, "arguments": [], "alert": {"action": request.event.fields.ACTION, "value": request.event.fields.VALUE}} |
| 64 | await send_put_request( |
| 65 | endpoint="/active-response", |
| 66 | data=json.dumps(data_dict), |
| 67 | params={"wait_for_complete": True, "agents_list": [request.event.fields.AGENT_ID]}, |
| 68 | debug=True, |
| 69 | ) |
| 70 | |
| 71 | return InvokeActiveResponseResponse(success=True, message="Wazuh Active Response invoked successfully") |