#
# Configuration file for syslog-ng under Debian
#
# attempts at reproducing default syslog behavior

# the standard syslog levels are (in descending order of priority):
# emerg alert crit err warning notice info debug
# the aliases "error", "panic", and "warn" are deprecated
# the "none" priority found in the original syslogd configuration is
# only used in internal messages created by syslogd


######
# options

options {
        #
        long_hostnames(0);

        # the time to wait before a died connection is re-established
        # (default is 60)
        time_reopen(10);

        # the time to wait before an idle destination file is closed
        # (default is 60)
        time_reap(360);

        # the number of lines buffered before written to file
        # you might want to increase this if your disk isn't catching with
        # all the log messages you get or if you want less disk activity
        # (say on a laptop)
        # (default is 0)
        #sync(0);

        # the number of lines fitting in the output queue
        log_fifo_size(2048);

        # enable or disable directory creation for destination files
        create_dirs(yes);

        # default owner, group, and permissions for log files
        # (defaults are 0, 0, 0600)
        #owner(root);
        group(adm);
        perm(0640);

        # default owner, group, and permissions for created directories
        # (defaults are 0, 0, 0700)
        #dir_owner(root);
        #dir_group(root);
        dir_perm(0755);

        # enable or disable DNS usage
        # syslog-ng blocks on DNS queries, so enabling DNS may lead to
        # a Denial of Service attack
        # (default is yes)
        use_dns(no);

        # maximum length of message in bytes
        # this is only limited by the program listening on the /dev/log Unix
        # socket, glibc can handle arbitrary length log messages, but -- for
        # example -- syslogd accepts only 1024 bytes
        # (default is 2048)
        #log_msg_size(2048);
};


######
# sources

# all known message sources
source s_all {
        # message generated by Syslog-NG
        internal();
        # standard Linux log source (this is the default place for the syslog()
        # function to send logs to)
        unix-stream("/dev/log");
        # messages from the kernel
        file("/proc/kmsg" log_prefix("kernel: "));
        # use the above line if you want to receive remote UDP logging messages
        # (this is equivalent to the "-r" syslogd flag)
        # udp();
};


######
# destinations

# some standard log files
destination df_auth { file("/var/log/auth.log"); };
destination df_syslog { file("/var/log/syslog"); };
destination df_cron { file("/var/log/cron.log"); };
destination df_daemon { file("/var/log/daemon.log"); };
destination df_kern { file("/var/log/kern.log"); };
destination df_lpr { file("/var/log/lpr.log"); };
destination df_mail { file("/var/log/mail.log"); };
destination df_user { file("/var/log/user.log"); };
destination df_uucp { file("/var/log/uucp.log"); };

destination df_firewall { file("/var/log/firewall/firewall.log"); };
destination df_pureftpd { file("/var/log/pure-ftpd/ftp.log"); };
destination df_spamd { file("/var/log/spam/spam.log"); };
destination df_ssh { file("/var/log/ssh/ssh.log"); };

# these files are meant for the mail and news systems log files
# and provide re-usable destinations for {mail,news,...}.info,
# {mail,news,...}.notice, etc.
destination df_facility_dot_info { file("/var/log/$FACILITY.info"); };
destination df_facility_dot_notice { file("/var/log/$FACILITY.notice"); };
destination df_facility_dot_warn { file("/var/log/$FACILITY.warn"); };
destination df_facility_dot_err { file("/var/log/$FACILITY.err"); };
destination df_facility_dot_crit { file("/var/log/$FACILITY.crit"); };

# some more classical and useful files found in standard syslog configurations
destination df_debug { file("/var/log/debug"); };
destination df_messages { file("/var/log/messages"); };

# pipes
# a console to view log messages under X
destination dp_xconsole { pipe("/dev/xconsole"); };

# consoles
# this will send messages to everyone logged in
destination du_all { usertty("*"); };


######
# filters

# all messages from the auth and authpriv facilities
filter f_auth { facility(auth, authpriv); };

# all messages except from the auth and authpriv facilities
filter f_syslog { not facility(auth, authpriv) and not match(" ### Stealth Scan ### ") and not match(" ### XMAS Scan ### ") and not match(" ### SYN/RST Scan ### ") and not match(" ### Stealth FIN Scan ### ") and not match(" ### SYN/FIN Scan ### ") and not match(" ### Null Scan ### ") and not match(" ### Ping Scan ### ") and not match("## SCAN SYN/ACK ## ") and not match("## INPUT TCP sans SYN ## ") and not match("## INVALID INPUT ## ") and not match("## BAD INPUT ## ") and not match("## Connexion FTP ## ") and not match("## Connexion SSH ## ") and not match("## Identd ## ") and not match("pure-ftpd") and not match("spamd"); };

# respectively: messages from the cron, daemon, kern, lpr, mail, news, user,
# and uucp facilities
filter f_cron { facility(cron); };
filter f_daemon { facility(daemon); };
filter f_kern { facility(kern) and not match(" ### Stealth Scan ### ") and not match(" ### XMAS Scan ### ") and not match(" ### SYN/RST Scan ### ") and not match(" ### Stealth FIN Scan ### ") and not match(" ### SYN/FIN Scan ### ") and not match(" ### Null Scan ### ") and not match(" ### Ping Scan ### ") and not match("## SCAN SYN/ACK ## ") and not match("## INPUT TCP sans SYN ## ") and not match("## INVALID INPUT ## ") and not match("## BAD INPUT ## ") and not match("## Connexion FTP ## ") and not match("## Connexion SSH ## ")  and not match("## Identd ## ") and not match("pure-ftpd") and not match("spamd"); };
filter f_lpr { facility(lpr); };
filter f_mail { facility(mail); };
filter f_news { facility(news); };
filter f_user { facility(user); };
filter f_uucp { facility(uucp); };

# some filters to select messages of priority greater or equal to info, warn,
# and err
# (equivalents of syslogd's *.info, *.warn, and *.err)
filter f_at_least_info { level(info..emerg); };
filter f_at_least_notice { level(notice..emerg); };
filter f_at_least_warn { level(warn..emerg); };
filter f_at_least_err { level(err..emerg); };
filter f_at_least_crit { level(crit..emerg); };

# all messages of priority debug not coming from the auth, authpriv, news, and
# mail facilities
filter f_debug { level(debug) and not facility(auth, authpriv, news, mail); };

# all messages of info, notice, or warn priority not coming form the auth,
# authpriv, cron, daemon, mail, and news facilities
filter f_messages {
        level(info,notice,warn)
            and not facility(auth,authpriv,cron,daemon,mail,news)and not match (".*IN=.*OUT=.*MAC=.*") and not match ("pure-ftpd*") and not match("spamd*") and not match("syslog-ng*:*STATS:*dropped"); };


# messages with priority emerg
filter f_emerg { level(emerg); };

# complex filter for messages usually sent to the xconsole
filter f_xconsole {
    facility(daemon,mail)
        or level(debug,info,notice,warn)
        or (facility(news)
                and level(crit,err,notice));
};

filter f_iptables { match("IN=.*OUT=.*MAC=.*"); };
filter f_pureftpd { match("pure-ftpd*"); };
filter f_spamd { match("spamd*"); };
filter f_ssh { match("sshd*"); };

######
# logs
# order matters if you use "flags(final);" to mark the end of processing in a
# "log" statement

# these rules provide the same behavior as the commented original syslogd rules

# auth,authpriv.*                 /var/log/auth.log
log {
        source(s_all);
        filter(f_auth);
        destination(df_auth);
};

# *.*;auth,authpriv.none          -/var/log/syslog
log {
        source(s_all);
        filter(f_syslog);
        destination(df_syslog);
};

# this is commented out in the default syslog.conf
# cron.*                         /var/log/cron.log
#log {
#        source(s_all);
#        filter(f_cron);
#        destination(df_cron);
#};

# daemon.*                        -/var/log/daemon.log
log {
        source(s_all);
        filter(f_daemon);
        destination(df_daemon);
};

# kern.*                          -/var/log/kern.log
log {
        source(s_all);
        filter(f_kern);
        destination(df_kern);
};

# lpr.*                           -/var/log/lpr.log
log {
        source(s_all);
        filter(f_lpr);
        destination(df_lpr);
};

# mail.*                          -/var/log/mail.log
log {
        source(s_all);
        filter(f_mail);
        destination(df_mail);
};

# user.*                          -/var/log/user.log
log {
        source(s_all);
        filter(f_user);
        destination(df_user);
};

# uucp.*                          /var/log/uucp.log
log {
        source(s_all);
        filter(f_uucp);
        destination(df_uucp);
};

# mail.info                       -/var/log/mail.info
log {
        source(s_all);
        filter(f_mail);
        filter(f_at_least_info);
        destination(df_facility_dot_info);
};

# mail.warn                       -/var/log/mail.warn
log {
        source(s_all);
        filter(f_mail);
        filter(f_at_least_warn);
        destination(df_facility_dot_warn);
};

# mail.err                        /var/log/mail.err
log {
        source(s_all);
        filter(f_mail);
        filter(f_at_least_err);
        destination(df_facility_dot_err);
};

# news.crit                       /var/log/news/news.crit
log {
        source(s_all);
        filter(f_news);
        filter(f_at_least_crit);
        destination(df_facility_dot_crit);
};

# news.err                        /var/log/news/news.err
log {
        source(s_all);
        filter(f_news);
        filter(f_at_least_err);
        destination(df_facility_dot_err);
};

# news.notice                     /var/log/news/news.notice
log {
        source(s_all);
        filter(f_news);
        filter(f_at_least_notice);
        destination(df_facility_dot_notice);
};


# *.=debug;
#         auth,authpriv.none;
#         news.none;mail.none     -/var/log/debug
log {
        source(s_all);
        filter(f_debug);
        destination(df_debug);
};


# *.=info;*.=notice;*.=warn;
#         auth,authpriv.none;
#         cron,daemon.none;
#         mail,news.none          -/var/log/messages
log {
        source(s_all);
        filter(f_messages);
        destination(df_messages);
};

# *.emerg                         *
log {
        source(s_all);
        filter(f_emerg);
        destination(du_all);
};


# daemon.*;mail.*;
#         news.crit;news.err;news.notice;
#         *.=debug;*.=info;
#         *.=notice;*.=warn       |/dev/xconsole
log {
        source(s_all);
        filter(f_xconsole);
        destination(dp_xconsole);
};

# Firewall
log {
   source(s_all);
   filter(f_iptables);
   destination(df_firewall);
};

# FTP
log {
   source(s_all);
   filter(f_pureftpd);
   destination(df_pureftpd);
};

# Spam
log {
   source(s_all);
   filter(f_spamd);
   destination(df_spamd);
};

# SSH
log {
   source(s_all);
   filter(f_ssh);
   destination(df_ssh);
};

iptables -A INPUT -p TCP --tcp-flags ! ALL SYN -m state --state NEW -m limit --limit 3/s -j LOG --log-tcp-option  --log-ip-options --log-level info --log-prefix "## INPUT TCP sans SYN ## "