mirror of https://github.com/searxng/searxng.git
149 lines
4.3 KiB
ReStructuredText
149 lines
4.3 KiB
ReStructuredText
==========================
|
|
How to protect an instance
|
|
==========================
|
|
|
|
Searx depens on external search services. To avoid the abuse of these services
|
|
it is advised to limit the number of requests processed by searx.
|
|
|
|
An application firewall, ``filtron`` solves exactly this problem. Information
|
|
on how to install it can be found at the `project page of filtron
|
|
<https://github.com/asciimoo/filtron>`__.
|
|
|
|
|
|
Sample configuration of filtron
|
|
===============================
|
|
|
|
An example configuration can be find below. This configuration limits the access
|
|
of:
|
|
|
|
- scripts or applications (roboagent limit)
|
|
- webcrawlers (botlimit)
|
|
- IPs which send too many requests (IP limit)
|
|
- too many json, csv, etc. requests (rss/json limit)
|
|
- the same UserAgent of if too many requests (useragent limit)
|
|
|
|
.. code:: json
|
|
|
|
[{
|
|
"name":"search request",
|
|
"filters":[
|
|
"Param:q",
|
|
"Path=^(/|/search)$"
|
|
],
|
|
"interval":"<time-interval-in-sec (int)>",
|
|
"limit":"<max-request-number-in-interval (int)>",
|
|
"subrules":[
|
|
{
|
|
"name":"roboagent limit",
|
|
"interval":"<time-interval-in-sec (int)>",
|
|
"limit":"<max-request-number-in-interval (int)>",
|
|
"filters":[
|
|
"Header:User-Agent=(curl|cURL|Wget|python-requests|Scrapy|FeedFetcher|Go-http-client)"
|
|
],
|
|
"actions":[
|
|
{
|
|
"name":"block",
|
|
"params":{
|
|
"message":"Rate limit exceeded"
|
|
}
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"name":"botlimit",
|
|
"limit":0,
|
|
"stop":true,
|
|
"filters":[
|
|
"Header:User-Agent=(Googlebot|bingbot|Baiduspider|yacybot|YandexMobileBot|YandexBot|Yahoo! Slurp|MJ12bot|AhrefsBot|archive.org_bot|msnbot|MJ12bot|SeznamBot|linkdexbot|Netvibes|SMTBot|zgrab|James BOT)"
|
|
],
|
|
"actions":[
|
|
{
|
|
"name":"block",
|
|
"params":{
|
|
"message":"Rate limit exceeded"
|
|
}
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"name":"IP limit",
|
|
"interval":"<time-interval-in-sec (int)>",
|
|
"limit":"<max-request-number-in-interval (int)>",
|
|
"stop":true,
|
|
"aggregations":[
|
|
"Header:X-Forwarded-For"
|
|
],
|
|
"actions":[
|
|
{
|
|
"name":"block",
|
|
"params":{
|
|
"message":"Rate limit exceeded"
|
|
}
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"name":"rss/json limit",
|
|
"interval":"<time-interval-in-sec (int)>",
|
|
"limit":"<max-request-number-in-interval (int)>",
|
|
"stop":true,
|
|
"filters":[
|
|
"Param:format=(csv|json|rss)"
|
|
],
|
|
"actions":[
|
|
{
|
|
"name":"block",
|
|
"params":{
|
|
"message":"Rate limit exceeded"
|
|
}
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"name":"useragent limit",
|
|
"interval":"<time-interval-in-sec (int)>",
|
|
"limit":"<max-request-number-in-interval (int)>",
|
|
"aggregations":[
|
|
"Header:User-Agent"
|
|
],
|
|
"actions":[
|
|
{
|
|
"name":"block",
|
|
"params":{
|
|
"message":"Rate limit exceeded"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}]
|
|
|
|
|
|
|
|
Route request through filtron
|
|
=============================
|
|
|
|
Filtron can be started using the following command:
|
|
|
|
.. code:: sh
|
|
|
|
$ filtron -rules rules.json
|
|
|
|
It listens on ``127.0.0.1:4004`` and forwards filtered requests to
|
|
``127.0.0.1:8888`` by default.
|
|
|
|
Use it along with ``nginx`` with the following example configuration.
|
|
|
|
.. code:: nginx
|
|
|
|
location / {
|
|
proxy_set_header Host $http_host;
|
|
proxy_set_header X-Real-IP $remote_addr;
|
|
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
|
|
proxy_set_header X-Scheme $scheme;
|
|
proxy_pass http://127.0.0.1:4004/;
|
|
}
|
|
|
|
Requests are coming from port 4004 going through filtron and then forwarded to
|
|
port 8888 where a searx is being run.
|