From 1fb7ffe759f5d4ff73a6d271c5b98c8c18a0ad1c Mon Sep 17 00:00:00 2001 From: Michele Bologna Date: Fri, 14 Sep 2018 22:12:52 +0200 Subject: [PATCH 1/4] Feat: ban nginx forbidden accesses If you have configured nginx to forbid some paths in your webserver, e.g.: location ~ /\. { deny all; } if a client tries to access https://yoursite/.user.ini then you will see in nginx error log: 2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 10.20.30.40, server: www.example.net, request: "GET /.user.ini HTTP/1.1", host: "www.example.net", referrer: "https://www.example.net" By carefully setting this filter we ban every IP that tries too many times to access forbidden resources. Author: Michele Bologna https://www.michelebologna.net/ --- config/filter.d/nginx-forbidden.conf | 21 +++++++++++++++++++++ fail2ban/tests/files/logs/nginx-forbidden | 5 +++++ 2 files changed, 26 insertions(+) create mode 100644 config/filter.d/nginx-forbidden.conf create mode 100644 fail2ban/tests/files/logs/nginx-forbidden diff --git a/config/filter.d/nginx-forbidden.conf b/config/filter.d/nginx-forbidden.conf new file mode 100644 index 00000000..3c54e61e --- /dev/null +++ b/config/filter.d/nginx-forbidden.conf @@ -0,0 +1,21 @@ +# fail2ban filter configuration for nginx forbidden accesses +# +# If you have configured nginx to forbid some paths in your webserver, e.g.: +# +# location ~ /\. { +# deny all; +# } +# +# if a client tries to access https://yoursite/.user.ini then you will see +# in nginx error log: +# +# 2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 10.20.30.40, server: www.example.net, request: "GET /.user.ini HTTP/1.1", host: "www.example.net", referrer: "https://www.example.net" +# +# By carefully setting this filter we ban every IP that tries too many times to +# access forbidden resources. +# +# Author: Michele Bologna https://www.michelebologna.net/ + +[Definition] +failregex = \[error\] \d+#\d+: \*\d+ access forbidden by rule, client: +ignoreregex = diff --git a/fail2ban/tests/files/logs/nginx-forbidden b/fail2ban/tests/files/logs/nginx-forbidden new file mode 100644 index 00000000..6da3ed01 --- /dev/null +++ b/fail2ban/tests/files/logs/nginx-forbidden @@ -0,0 +1,5 @@ +# failJSON: { "time": "2018-09-14T19:03:05", "match": true , "host": "12.34.56.78" } +2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 12.34.56.78, server: www.example.net, request: "GET /wp-content/themes/evolve/js/back-end/libraries/fileuploader/upload_handler.php HTTP/1.1", host: "www.example.net", referrer: "http://example.net/foo.php" + +# failJSON: { "time": "2018-09-13T15:42:05", "match": true , "host": "12.34.56.78" } +2018/09/13 15:42:05 [error] 2035#2035: *287 access forbidden by rule, client: 12.34.56.78, server: www.example.com, request: "GET /wp-config.php~ HTTP/1.1", host: "www.example.com" From 7e88ae0ee66628893a283d6fed06a347f9f6673e Mon Sep 17 00:00:00 2001 From: Michele Bologna Date: Fri, 14 Sep 2018 23:08:12 +0200 Subject: [PATCH 2/4] Feat: add forbidden to jail.conf --- config/jail.conf | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/config/jail.conf b/config/jail.conf index 697c81dd..a6f2ac5a 100644 --- a/config/jail.conf +++ b/config/jail.conf @@ -390,6 +390,11 @@ port = http,https logpath = %(nginx_error_log)s maxretry = 2 +[nginx-forbidden] + +port = http,https +logpath = %(nginx_error_log)s +maxretry = 10 # Ban attackers that try to use PHP's URL-fopen() functionality # through GET/POST variables. - Experimental, with more than a year From 212a4c236aaeeac79a8f24cf8758d4e7aa4375e5 Mon Sep 17 00:00:00 2001 From: "Sergey G. Brester" Date: Thu, 23 Mar 2023 12:12:55 +0100 Subject: [PATCH 3/4] update changeLog, nginx-forbidden, gh-2226 --- ChangeLog | 1 + 1 file changed, 1 insertion(+) diff --git a/ChangeLog b/ChangeLog index 0cc088eb..d13057c9 100644 --- a/ChangeLog +++ b/ChangeLog @@ -19,6 +19,7 @@ ver. 1.0.3-dev-1 (20??/??/??) - development nightly edition (value read from `/proc/sys/net/ipv6/conf/all/disable_ipv6`) if available, otherwise seeks over local IPv6 from network interfaces if available for platform and uses DNS to find local IPv6 as a fallback only * improve `ignoreself` by considering all local addresses from network interfaces additionally to IPs from hostnames (gh-3132) +* `filter.d/nginx-forbidden.conf` - new filter to ban forbidden locations, e. g. using `deny` directive (gh-2226) ver. 1.0.2 (2022/11/09) - finally-war-game-test-tape-not-a-nuclear-alarm From 9cbf59c82718a82887f7326d8f58bc0a185dc292 Mon Sep 17 00:00:00 2001 From: "Sergey G. Brester" Date: Thu, 23 Mar 2023 12:16:13 +0100 Subject: [PATCH 4/4] anchored datepattern and added journalmatch (if monitoring systemd journal) --- config/filter.d/nginx-forbidden.conf | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/config/filter.d/nginx-forbidden.conf b/config/filter.d/nginx-forbidden.conf index 3c54e61e..62d15a41 100644 --- a/config/filter.d/nginx-forbidden.conf +++ b/config/filter.d/nginx-forbidden.conf @@ -19,3 +19,7 @@ [Definition] failregex = \[error\] \d+#\d+: \*\d+ access forbidden by rule, client: ignoreregex = + +datepattern = {^LN-BEG} + +journalmatch = _SYSTEMD_UNIT=nginx.service + _COMM=nginx