I am trying to create a python webhook to receive data from my ELastic SIEM (JSON format), when I try it I am getting this errors: (sorry It’s my first time using python, so couldn’t know what’s the problem)
* Serving Flask app "webhook3" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: on
* Running on http://10.10.13.135:8080/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 235-675-806
{"body": "test"}
10.13.81.254 - - [11/Dec/2020 16:43:02] "POST /webhook HTTP/1.1" 200 -
10.13.81.254 - - [11/Dec/2020 16:43:21] "POST /webhook HTTP/1.1" 500 -
Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2464, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2450, in wsgi_app
response = self.handle_exception(e)
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.8/dist-packages/flask/_compat.py", line 39, in reraise
raise value
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.8/dist-packages/flask/_compat.py", line 39, in reraise
raise value
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/opt/thehive/webhook3.py", line 20, in api_webhook_messages
my_info = json.loads(request.data)
File "/usr/local/lib/python3.8/dist-packages/flask/json/__init__.py", line 253, in loads
return _json.loads(s, **kwargs)
File "/usr/lib/python3/dist-packages/simplejson/__init__.py", line 535, in loads
return cls(encoding=encoding, **kw).decode(s)
File "/usr/lib/python3/dist-packages/simplejson/decoder.py", line 370, in decode
obj, end = self.raw_decode(s)
File "/usr/lib/python3/dist-packages/simplejson/decoder.py", line 400, in raw_decode
return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
The webhook configuration:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from flask import json # To read json data
from flask import request # To receive headers
from flask import Flask # To be able to start the application
app = Flask(__name__)
@app.route('/')
def api_root():
return 'Welcome guys'
@app.route('/webhook', methods=['POST'])
def api_webhook_messages():
my_info = json.loads(request.data)
print(json.dumps(my_info))
return 'Connection sucessful'
if __name__=='__main__':
app.run(port=8080, host='10.10.13.135',debug=True)
And here is the watcher that I have configured:
POST _watcher/watch/_execute
{
"watch": {
"trigger": {
"schedule": {
"interval": "1h"
}
},
"input": {
"search": {
"request": {
"indices": "firewall-*",
"body": {
"size": 0,
"query": {
"bool": {
"filter": {
"range": {
"@timestamp": {
"from": "now-1h",
"to": "now"
}
}
}
}
},
"aggs": {
"by_source_ip": {
"terms": {
"size": 100,
"field": "source.ip"
},
"aggs": {
"by_destination_ip": {
"terms": {
"size": 100,
"field": "destination.ip"
},
"aggs": {
"by_port_number": {
"terms": {
"size": 100,
"field": "destination.port",
"order": {
"_count": "asc"
}
}
}
}
}
}
}
}
}
}
}
},
"condition": {
"script":
"""
for (int i=0; i < ctx.payload.aggregations.by_source_ip.buckets.size(); i++)
{
for (int j=0; j < ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets.size() ; j++ )
{
if (ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets[j].by_port_number.buckets.size() > 15 ) // l'action ne sera exécuté seulement s'il y a un scan de 20 port par @IP source / @IP destination
{
return true;
}
}
}
"""
},
"transform":
{
"script":
"""
String[] source= new String[5]; // Un vercteur qui contient les addresse IP source des scan
String[] destination= new String[5]; // Un vercteur qui contient les adresse IP destination qui ont été scanné
int[] nombre_port= new int[5]; // Un vecteur qui contient le nombre de ports scanné pour (IP source / IP destination)
int n=0;
for (int i=0; i < ctx.payload.aggregations.by_source_ip.buckets.size(); i++)
{
for (int j=0; j < ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets.size() ; j++ )
{
if (ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets[j].by_port_number.buckets.size() > 15) // Pour entregistrer seulement les addresse IP source/destinations qui ont déclenché l'alarme
{
if (n<5) // Pour s'assurer qu'on dépasse pas 5 cases qu'on a alloué
{
source[n] = ctx.payload.aggregations.by_source_ip.buckets[i].key;
destination[n] = ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets[j].key;
nombre_port[n] = ctx.payload.aggregations.by_source_ip.buckets[i].by_destination_ip.buckets[j].by_port_number.buckets.size();
n++;
}
}
}
}
return [source,destination,nombre_port];
"""
},
"actions": {
"my_webhook": {
"webhook": {
"method": "POST",
"host": "10.10.13.135",
"path": "/webhook",
"port": 8080,
"body": "test"
}
}
}
}
}
Could you please help me to solve this error ! Thanks :)
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Answer
So I just found out that the data send wasn’t in a json format and to print I used:
def api_webhook_messages(): data = request.data print(data)
Thanks for your help