URL spam security for Flask.
IpBan is a Flask extension that can help protect against ip locations spamming url requests against unknown pages. Often this is to search for security issues.
The default configuration:
20 attempts before ban
1 hour blocking period
Once an ip address is banned any attempt to access a web address on your site from that ip will result in a 403 forbidden status response. After the default 1 hour blocking period of no access attempts the ban will be lifted. Any access attempt during the ban period will extend the ban period.
Ip addresses can be entered for banning by the api.
Url patterns can be entered to be excluded from ban calculations by the api.
Url patterns can be entered for banning by the api.
Installation & Basic Usage
Install via pip:
pip install flask-ipban
After installing, wrap your Flask app with an IpBan, or call ip_ban.init_app(app):
from flask import Flask from flask_ipban import IpBan app = Flask(__name__) IpBan(app, ban_seconds=200)
The repository includes a small example application
ban_count, default 20, Number of observations before banning
ban_seconds, default 60, Number of seconds ip address is banned
persist, default False, Persist, by the use of a file in the tmp folder, the ip ban list.
persist_file_name, default None, Override the name of the persistence file.
Config by env variable overrides options
These environment variables will override options from the initialisation.
IP_BAN_LIST_COUNT - number of observations before 403 exception
IP_BAN_LIST_SECONDS - number of seconds to retain memory of IP
block(ip_address, permanent=False) - block the specific address optionally forever
add(ip=None, url=None, reason='404') - increase the observations for the current request ip or given ip address
remove(ip_address) - remove the given ip address from the ban list. Returns true if ban removed.
url_pattern_add('reg-ex-pattern', match_type='regex') - exclude any url matching the pattern from checking
url_pattern_remove('reg-ex-pattern') - remove pattern from the url whitelist
url_block_pattern_add('reg-ex-pattern', match_type='regex') - add any url matching the pattern to the block list. match_type can be ‘string’ or ‘regex’. String is direct match. Regex is a regex pattern.
url_block_pattern_remove('reg-ex-pattern') - remove pattern from the url block list
ip_whitelist_add('ip-address') - exclude the given ip from checking
ip_whitelist_remove('ip-address') - remove the given ip from the ip whitelist
load_nuisances(file_name=None) - add a list of nuisances to url pattern block list from a file. See below for more information.
Example whitelist code
from flask import Flask from flask_ipban import IpBan app = Flask(__name__) ip_ban = IpBan(app) ip_ban.url_pattern_add('^/whitelist$') @app.route('/normal') def normal(): return 'Normal' @app.route('/whitelist') def whitelist(): parameter_value = request.args.get('parameter') return 'whitelist ' + parameter_value
Url matching match_type can be ‘string’ or ‘regex’. String is direct match. Regex is a regex pattern.
ip_ban includes a file of common web nuisances that should not be allowed on a flask site. It includes:
Blocking any non flask extension such as .jsp, .asp etc.
Known hacking urls.
Nuisance urls are only checked as a result of a 404. If you have legitimate routes that use nuisance url patterns they won’t result in a block.
Load them by calling ip_ban.load_nuisances()
You can add your own nuisance file by calling with the parameter file_name=.
See the nuisance.txt file in the source for formatting and details.
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