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{%
// Copyright (c) 2023 Eric Fahlgren <eric.fahlgren@gmail.com>
// SPDX-License-Identifier: GPL-2.0
// Create some snort-format-specific items.
let home_net = snort.home_net == 'any' ? "'any'" : snort.home_net;
let external_net = snort.external_net;
let line_mode = snort.mode == "ids" ? "tap" : "inline";
let mod_mode = snort.mode == "ids" ? "passive" : "inline";
let inputs = null;
let vars = null;
switch (snort.method) {
case "pcap":
case "afpacket":
inputs = `{ '${snort.interface}' }`;
vars = "{}";
break;
case "nfq":
inputs = "{ ";
for (let i = int(nfq.queue_start); i < int(nfq.queue_start)+int(nfq.queue_count); i++) {
inputs += `'${i}', `
}
inputs += "}";
vars = `{ 'device=${snort.interface}', 'queue_maxlen=${nfq.queue_maxlen}', 'fanout_type=${nfq.fanout_type}', 'fail_open', }`;
break;
}
-%}
-- Do not edit, automatically generated. See /usr/share/snort/templates.
-- These must be defined before processing snort.lua
HOME_NET = [[ {{ home_net }} ]]
EXTERNAL_NET = [[ {{ external_net }} ]]
include('{{ snort.config_dir }}/snort.lua')
snort = {
{% if (snort.mode == 'ips'): %}
['-Q'] = true,
{% endif %}
['--daq'] = '{{ snort.method }}',
--['--daq-dir'] = '/usr/lib/daq/',
{% if (snort.method == 'nfq'): %}
['--max-packet-threads'] = {{ nfq.thread_count }},
{% endif %}
}
ips = {
mode = '{{ line_mode }}',
variables = default_variables,
{% if (snort.action != 'default'): %}
action_override = '{{ snort.action }}',
{% endif %}
{% if (getenv("_SNORT_WITHOUT_RULES") == "1"): %}
-- WARNING: THIS IS A TEST-ONLY CONFIGURATION WITHOUT ANY RULES.
{% else %}
include = '{{ snort.config_dir }}/' .. RULE_PATH .. '/snort.rules',
{% endif -%}
}
daq = {
inputs = {{ inputs }},
snaplen = {{ snort.snaplen }},
module_dirs = { '/usr/lib/daq/', },
modules = {
{
name = '{{ snort.method }}',
mode = '{{ mod_mode }}',
variables = {{ vars }},
}
}
}
alert_syslog = {
level = 'info',
}
{% if (int(snort.logging)): %}
-- Note that this is also the location of the PID file, if you use it.
output.logdir = '{{ snort.log_dir }}'
-- alert_full = { file = true, }
--[[
alert_fast = {
-- bool alert_fast.file = false: output to alert_fast.txt instead of stdout
-- bool alert_fast.packet = false: output packet dump with alert
-- int alert_fast.limit = 0: set maximum size in MB before rollover (0 is unlimited) { 0:maxSZ }
file = true,
packet = false,
}
--]]
alert_json = {
-- bool alert_json.file = false: output to alert_json.txt instead of stdout
-- int alert_json.limit = 0: set maximum size in MB before rollover (0 is unlimited) { 0:maxSZ }
-- string alert_json.separator = , : separate fields with this character sequence
-- multi alert_json.fields = 'timestamp pkt_num proto pkt_gen pkt_len dir src_ap dst_ap'
-- Rule action: selected fields will be output in given order left to right.
-- { action | class | b64_data | client_bytes | client_pkts | dir
-- | dst_addr | dst_ap | dst_port | eth_dst | eth_len | eth_src
-- | eth_type | flowstart_time | geneve_vni | gid | icmp_code
-- | icmp_id | icmp_seq | icmp_type | iface | ip_id | ip_len
-- | msg | mpls | pkt_gen | pkt_len | pkt_num | priority
-- | proto | rev | rule | seconds | server_bytes | server_pkts
-- | service | sgt | sid | src_addr | src_ap | src_port | target
-- | tcp_ack | tcp_flags | tcp_len | tcp_seq | tcp_win | timestamp
-- | tos | ttl | udp_len | vlan }
-- This is a minimal set of fields that simply supports 'snort-mgr report'
-- and minimizes log size:
fields = 'dir src_ap dst_ap msg',
-- This set also supports the report, but closely matches 'alert_fast' contents.
--fields = 'timestamp pkt_num proto pkt_gen pkt_len dir src_ap dst_ap rule action msg',
file = true,
}
--[[
unified2 = {
limit = 10, -- int unified2.limit = 0: set maximum size in MB before rollover (0 is unlimited) { 0:maxSZ }
}
--]]
{% endif -%}
normalizer = {
tcp = {
ips = true,
}
}
file_policy = {
enable_type = true,
enable_signature = true,
rules = {
use = {
verdict = 'log',
enable_file_type = true,
enable_file_signature = true,
}
}
}
-- To use openappid with snort, 'opkg install openappid' and enable in config.
{% if (int(snort.openappid)): %}
appid = {
log_stats = true,
app_detector_dir = '/usr/lib/openappid',
app_stats_period = 60,
}
{% endif %}
{%
if (snort.include) {
// We use the ucode include here, so that the included file is also
// part of the template and can use values passed in from the config.
printf("-- The following content from included file '%s'\n", snort.include);
include(snort.include, { snort, nfq });
}
%}
|
