115 lines
4.1 KiB
ReStructuredText
115 lines
4.1 KiB
ReStructuredText
How to protect an instance
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==========================
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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.
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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>`__.
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Sample configuration of filtron
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-------------------------------
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An example configuration can be find below. This configuration limits the access of
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* scripts or applications (roboagent limit)
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* webcrawlers (botlimit)
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* IPs which send too many requests (IP limit)
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* too many json, csv, etc. requests (rss/json limit)
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* the same UserAgent of if too many requests (useragent limit)
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.. code:: json
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[
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{
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"name": "search request",
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"filters": ["Param:q", "Path=^(/|/search)$"],
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"interval": <time-interval-in-sec>,
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"limit": <max-request-number-in-interval>,
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"subrules": [
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{
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"name": "roboagent limit",
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"interval": <time-interval-in-sec>,
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"limit": <max-request-number-in-interval>,
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"filters": ["Header:User-Agent=(curl|cURL|Wget|python-requests|Scrapy|FeedFetcher|Go-http-client)"],
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"actions": [
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{"name": "block",
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"params": {"message": "Rate limit exceeded"}}
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]
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},
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{
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"name": "botlimit",
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"limit": 0,
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"stop": true,
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"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)"],
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"actions": [
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{"name": "block",
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"params": {"message": "Rate limit exceeded"}}
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]
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},
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{
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"name": "IP limit",
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"interval": <time-interval-in-sec>,
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"limit": <max-request-number-in-interval>,
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"stop": true,
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"aggregations": ["Header:X-Forwarded-For"],
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"actions": [
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{"name": "block",
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"params": {"message": "Rate limit exceeded"}}
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]
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},
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{
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"name": "rss/json limit",
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"interval": <time-interval-in-sec>,
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"limit": <max-request-number-in-interval>,
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"stop": true,
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"filters": ["Param:format=(csv|json|rss)"],
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"actions": [
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{"name": "block",
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"params": {"message": "Rate limit exceeded"}}
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]
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},
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{
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"name": "useragent limit",
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"interval": <time-interval-in-sec>,
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"limit": <max-request-number-in-interval>,
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"aggregations": ["Header:User-Agent"],
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"actions": [
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{"name": "block",
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"params": {"message": "Rate limit exceeded"}}
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]
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}
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]
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}
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]
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Route request through filtron
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-----------------------------
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Filtron can be started using the following command:
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.. code:: bash
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$ filtron -rules rules.json
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It listens on 127.0.0.1:4004 and forwards filtered requests to 127.0.0.1:8888 by default.
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Use it along with ``nginx`` with the following example configuration.
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.. code:: bash
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location / {
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proxy_set_header Host $http_host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Scheme $scheme;
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proxy_pass http://127.0.0.1:4004/;
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}
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Requests are coming from port 4004 going through filtron and then forwarded to port 8888 where a searx is being run.
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