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119 lines
3.9 KiB
Plaintext
119 lines
3.9 KiB
Plaintext
## Version 2022/08/06
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# Fail2Ban configuration file for black-listing via nginx
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#
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# Author: Serg G. Brester (aka sebres)
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#
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# To use 'nginx-block-map' action you should define some special blocks in your nginx configuration,
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# and use it hereafter in your locations (to notify fail2ban by failure, resp. nginx by ban).
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#
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# Example (argument "token_id" resp. cookie "session_id" used here as unique identifier for user):
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#
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# http {
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# ...
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# # maps to check user is blacklisted (banned in f2b):
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# #map $arg_token_id $blck_lst_tok { include blacklisted-tokens.map; }
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# map $cookie_session_id $blck_lst_ses { include blacklisted-sessions.map; }
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# ...
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# # special log-format to notify fail2ban about failures:
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# log_format f2b_session_errors '$msec failure "$cookie_session_id" - $remote_addr - $remote_user '
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# ;# '"$request" $status $bytes_sent '
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# # '"$http_referer" "$http_user_agent"';
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#
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# # location checking blacklisted values:
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# location ... {
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# # check banned sessionid:
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# if ($blck_lst_ses != "") {
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# try_files "" @f2b-banned;
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# }
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# ...
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# # notify fail2ban about a failure inside nginx:
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# error_page 401 = @notify-f2b;
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# ...
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# }
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# ...
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# # location for return with "403 Forbidden" if banned:
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# location @f2b-banned {
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# default_type text/html;
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# return 403 "<br/><center>
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# <b style=\"color:red; font-size:18pt; border:2pt solid black; padding:5pt;\">
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# You are banned!</b></center>";
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# }
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# ...
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# # location to notify fail2ban about a failure inside nginx:
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# location @notify-f2b {
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# access_log /var/log/nginx/f2b-auth-errors.log f2b_session_errors;
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# }
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# }
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# ...
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#
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# Note that quote-character (and possibly other special characters) are not allowed currently as session-id.
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# Thus please add any session-id validation rule in your locations (or in the corresponding backend-service),
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# like in example below:
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#
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# location ... {
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# if ($cookie_session_id !~ "^[\w\-]+$") {
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# return 403 "Wrong session-id"
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# }
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# ...
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# }
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#
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# The parameters for jail corresponding log-format (f2b_session_errors):
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#
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# [nginx-blck-lst]
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# filter =
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# datepattern = ^Epoch
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# failregex = ^ failure "<F-ID>[^"]+</F-ID>" - <ADDR>
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# usedns = no
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#
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# The same log-file can be used for IP-related jail (additionally to session-related, to ban very bad IPs):
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#
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# [nginx-blck-ip]
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# maxretry = 100
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# filter =
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# datepattern = ^Epoch
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# failregex = ^ failure "[^"]+" - <ADDR>
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# usedns = no
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#
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[Definition]
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# path to configuration of nginx (used to target nginx-instance in multi-instance system,
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# and as path for the blacklisted map):
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srv_cfg_path = /etc/nginx/
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# cmd-line arguments to supply to test/reload nginx:
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#srv_cmd = nginx -c %(srv_cfg_path)s/nginx.conf
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srv_cmd = nginx
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# pid file (used to check nginx is running):
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srv_pid = /run/nginx.pid
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# command used to check whether nginx is running and configuration is valid:
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srv_is_running = [ -f "%(srv_pid)s" ]
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srv_check_cmd = %(srv_is_running)s && %(srv_cmd)s -qt
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# first test nginx is running and configuration is correct, hereafter send reload signal:
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blck_lst_reload = %(srv_check_cmd)s; if [ $? -eq 0 ]; then
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%(srv_cmd)s -s reload; if [ $? -ne 0 ]; then echo 'reload failed.'; fi;
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fi;
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# map-file for nginx, can be redefined using `action = nginx-block-map[blck_lst_file="/path/file.map"]`:
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blck_lst_file = %(srv_cfg_path)s/blacklisted-sessions.map
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# Action definition:
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actionstart_on_demand = false
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actionstart = touch '%(blck_lst_file)s'
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actionflush = truncate -s 0 '%(blck_lst_file)s'; %(blck_lst_reload)s
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actionstop = %(actionflush)s
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actioncheck =
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_echo_blck_row = printf '\%%s 1;\n' "<fid>"
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actionban = %(_echo_blck_row)s >> '%(blck_lst_file)s'; %(blck_lst_reload)s
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actionunban = id=$(%(_echo_blck_row)s | sed -e 's/[]\/$*.^|[]/\\&/g'); sed -i "/^$id$/d" %(blck_lst_file)s; %(blck_lst_reload)s
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