Snort3 (PulledPork)

PulledPork

・Perl module

    [root]# cpan LWP::UserAgent::Determined Net::SSLeay
                            LWP::Protocol::https Sys::Syslog Archive::Tar

・Installation

    [root]# mkdir -p /usr/local/pulledpork/etc
    [root]# git clone https://github.com/shirkdog/pulledpork.git
    [root]# cp -v pulledpork/pulledpork.pl /usr/local/pulledpork/
    [root]# cp -v pulledpork/etc/* /usr/local/pulledpork/etc/
    [root]# chown -R snort:snort /usr/local/pulledpork/
    [root]# chmod 755 /usr/local/pulledpork/pulledpork.pl

・Constitution

    [root]# vim /usr/local/pulledpork/etc/pulledpork.conf

rule_url=https://www.snort.org/reg-rules/|snortrules-snapshot.tar.gz|<OINKCODE>

#ignore=deleted.rules,experimental.rules,local.rules

rule_path=/usr/local/snort/rules/snort.rules

local_rules=/usr/local/snort/rules/local.rules

sid_msg=/usr/local/snort/etc/snort/sid-msg.map

sid_changelog=/var/log/sid_changes.log

snort_path=/usr/local/snort/bin/snort

config_path=/usr/local/snort/etc/snort/snort.lua

distro=Centos-8

block_list=/usr/local/snort/intel/ip-blocklist

IPRVersion=/usr/local/snort/intel/

snort_control=/usr/local/bin/snort_control

pid_path=/var/log/snort/snort.pid

snort_version=3.9.0.0

enablesid=/usr/local/pulledpork/etc/enablesid.conf
dropsid=/usr/local/pulledpork/etc/dropsid.conf
disablesid=/usr/local/pulledpork/etc/disablesid.conf
modifysid=/usr/local/pulledpork/etc/modifysid.conf

#ips_policy=security  <-- comment out

version=0.8.0

・Run PulledPork and update rule file

    [root]# /usr/local/pulledpork/pulledpork.pl
                -c /usr/local/pulledpork/etc/pulledpork.conf -PE -v -T -H SIGHUP

    ※ If the rule file cannot be updated.

    [root]# curl -Lo snortrules-snapshot-3900.tar.gz
                https://www.snort.org/rules/snortrules-snapshot-3900.tar.gz?oinkcode=<OINKCODE>

    [root]# tar xvfz snortrules-snapshot-3900.tar.gz
    [root]# ls

      builtins  etc  rules  snortrules-snapshot-3900.tar.gz  so_rules

    [root]# cat rules/*.rules > /usr/local/snort/rules/snort.rules
    [root]# cp -v builtins/builtins.rules /usr/local/snort/builtin_rules/

・Periodically run PulledPork with systemd timer instead of cron

    [root]# vim /etc/systemd/system/pulledpork.service

[Unit]
Description=PulledPork service for updating Snort 3 rules
Wants=pulledpork.timer

[Service]
Type=oneshot
RemainAfterExit = yes
ExecStart=perl /usr/local/pulledpork/pulledpork.pl \
    -c /usr/local/pulledpork/etc/pulledpork.conf -PE -v -I security -T -H SIGHUP

SystemCallArchitectures = native
SystemCallFilter=~@clock
SystemCallFilter=~@cpu-emulation
SystemCallFilter=~@debug
SystemCallFilter=~@module
#× SystemCallFilter=~@mount
SystemCallFilter=~@obsolete
#× SystemCallFilter=~@privileged
SystemCallFilter=~@raw-io
SystemCallFilter=~@reboot
SystemCallFilter=~@resources
SystemCallFilter=~@swap

RestrictRealtime = yes

RemoveIPC = yes
PrivateIPC = yes

CapabilityBoundingSet =~ CAP_SYS_TIME CAP_SYS_PACCT CAP_KILL CAP_WAKE_ALARM \
    CAP_(DAC_*|FOWNER|IPC_OWNER) CAP_BPF CAP_LINUX_IMMUTABLE \
    CAP_IPC_LOCK CAP_SYS_MODULE CAP_SYS_TTY_CONFIG CAP_SYS_BOOT CAP_SYS_CHROOT \
    CAP_BLOCK_SUSPEND CAP_LEASE CAP_(CHOWN|FSETID|SETFCAP) CAP_SET(UID|GID|PCAP) \
    CAP_SYS_PTRACE CAP_SYS_(NICE|RESOURCE) CAP_SYS_RAWIO CAP_NET_ADMIN \
    CAP_NET_(BIND_SERVICE|BROADCAST|RAW) CAP_AUDIT_* CAP_SYS_ADMIN CAP_SYSLOG \
    CAP_MKNOD CAP_MAC_*

UMask = 0077

RestrictNamespaces = yes

#× ProtectSystem = strict
#× PrivateTmp = yes
PrivateMounts = yes
ProtectHome = yes
ReadWritePaths = /usr/local/snort /usr/local/pulledpork

PrivateDevices = yes
ProtectClock = yes
ProtectKernelLogs = yes
ProtectKernelModules = yes
ProtectKernelTunables = yes
ProtectControlGroups = yes

NoNewPrivileges = yes
MemoryDenyWriteExecute = yes
ProcSubset = pid

RestrictSUIDSGID = yes
ProtectHostname = yes
LockPersonality = yes
ProtectProc = invisible

[Install]
WantedBy = multi-user.target


    [root]# vim /etc/systemd/system/pulledpork.timer

[Unit]
Description=PulledPork service timer for updating Snort 3 rules
Requires=pulledpork.service

[Timer]
Unit=pulledpork.service
OnCalendar=*-*-* 00:15:00
AccuracySec=1us

[Install]
WantedBy=timers.target

    [root]# systemctl daemon-reload
    [root]# systemctl enable pulledpork.timer