proftpd 1.3.5e can leave inconsistent error message if ftp or mod_sftp is used
Oct 2 15:45:31 ftp01 proftpd[5516]: 10.10.2.13 (10.10.2.189[10.10.2.189]) - SECURITY VIOLATION: Root login attempted
Oct 2 15:45:44 ftp01 proftpd[5517]: 10.10.2.13 (10.10.2.189[10.10.2.189]) - SECURITY VIOLATION: Root login attempted.
Fix regex to make trailing period optional, otherwise brute force attacks against root account using ftp are not blocked correctly.
- recognizes failures logged using another format (something like session-id, IP enclosed in square brackets);
- failregex extended to catch connections rejected for policy reasons (gh-2228);
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/
- extended with new default date-pattern `^(?:%%Y-)?%%m-%%d[ T]%%H:%%M:%%S(?:\.%%f)?` to cover
`YYYY-mm-dd HH:MM::SS.ms` as well as `mm-dd HH:MM::SS.ms` (so year is optional);
- more optional arguments in log-line (so accept [WARN] as well as [WARNING] and optional [SOFIA] hereafter);
If the "retry" variable is set in the service script, we don't have to
pass it to start-stop-daemon explicitly. While we can't immediately
eliminate any code with this change, it will be necessary later to
adopt the default OpenRC stop() function.
If our service is installed under some other name, then we don't want
the service script to say things like "Starting fail2ban..." because
the name "fail2ban" won't make any sense at that point. Instead, we
use the $RC_SVCNAME variable to ensure that the service name matches
what we tell the user. Typically, however, $RC_SVCNAME will still be
"fail2ban".
Our OpenRC service script performs two tasks before starting the service:
1. It removes any stake sockets (from e.g. a system crash).
2. It ensures that the PID file directory exists.
These have both been moved into the "start_pre" phase, which is
designed to do such things (and will allow us to simplify the "start"
phase in the future). The existing "mkdir -p" has also been converted
into a "checkpath -d" command which is built-in to OpenRC.
Sergey G. Brester