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add hook to pacf that allows users to modify all rules or implement

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This commit is contained in:
Johanna Amann 2015-06-02 14:23:25 -07:00
parent ed40855152
commit 1439c244fc
3 changed files with 55 additions and 0 deletions
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10
scripts/base/frameworks/pacf/main.bro
View file

@ -159,6 +159,13 @@ export {
## msg: An optional informational message by the plugin. ## msg: An optional informational message by the plugin.
global rule_error: event(r: Rule, p: PluginState, msg: string &default=""); global rule_error: event(r: Rule, p: PluginState, msg: string &default="");
## Hook that allows the modification of rules passed to add_rule before they
## are passed on to the plugins. If one of the hooks uses break, the rule is
## ignored and not passed on to any plugin.
##
## r: The rule to be added
global Pacf::rule_policy: hook(r: Rule);
## Type of an entry in the PACF log. ## Type of an entry in the PACF log.
type InfoCategory: enum { type InfoCategory: enum {
## A log entry reflecting a framework message. ## A log entry reflecting a framework message.
@ -402,6 +409,9 @@ function add_rule_impl(rule: Rule) : string
if ( ! rule?$id || rule$id == "" ) if ( ! rule?$id || rule$id == "" )
rule$id = cat(rule$cid); rule$id = cat(rule$cid);
if ( ! hook Pacf::rule_policy(rule) )
return "";
local accepted = F; local accepted = F;
local priority: int = +0; local priority: int = +0;
local r = rule; local r = rule;

18
testing/btest/Baseline/scripts.base.frameworks.pacf.hook/pacf.log Normal file
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@ -0,0 +1,18 @@
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path pacf
#open 2015-06-02-21-23-05
#fields ts category cmd state action target entity_type entity msg location plugin
#types time enum string enum string enum string string string string string
0.000000 Pacf::MESSAGE - - - - - - activated plugin with priority 0 - Debug-All
1254722767.875996 Pacf::RULE ADD Pacf::REQUESTED Pacf::DROP Pacf::MONITOR Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722767.875996 Pacf::RULE ADD Pacf::REQUESTED Pacf::REDIRECT Pacf::FORWARD Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722767.875996 Pacf::RULE ADD Pacf::SUCCEEDED Pacf::DROP Pacf::MONITOR Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722767.875996 Pacf::RULE ADD Pacf::SUCCEEDED Pacf::REDIRECT Pacf::FORWARD Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722776.690444 Pacf::RULE REMOVE Pacf::REQUESTED Pacf::REDIRECT Pacf::FORWARD Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722776.690444 Pacf::RULE REMOVE Pacf::REQUESTED Pacf::DROP Pacf::MONITOR Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722776.690444 Pacf::RULE REMOVE Pacf::SUCCEEDED Pacf::REDIRECT Pacf::FORWARD Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
1254722776.690444 Pacf::RULE REMOVE Pacf::SUCCEEDED Pacf::DROP Pacf::MONITOR Pacf::FLOW 0.0.0.0/0/1470->74.53.140.153/32/25 - (empty) Debug-All
#close 2015-06-02-21-23-05

27
testing/btest/scripts/base/frameworks/pacf/hook.bro Normal file
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@ -0,0 +1,27 @@
# @TEST-EXEC: bro -r $TRACES/smtp.trace %INPUT
# @TEST-EXEC: btest-diff pacf.log
@load base/frameworks/pacf
event bro_init()
{
local pacf_debug = Pacf::create_debug(T);
Pacf::activate(pacf_debug, 0);
}
event connection_established(c: connection)
{
local id = c$id;
Pacf::shunt_flow([$src_h=id$orig_h, $src_p=id$orig_p, $dst_h=id$resp_h, $dst_p=id$resp_p], 30sec);
Pacf::drop_address(id$orig_h, 15sec);
Pacf::whitelist_address(id$orig_h, 15sec);
Pacf::redirect_flow([$src_h=id$orig_h, $src_p=id$orig_p, $dst_h=id$resp_h, $dst_p=id$resp_p], 5, 30sec);
}
hook Pacf::rule_policy(r: Pacf::Rule)
{
if ( r$expire == 15sec )
break;
r$entity$flow$src_h = 0.0.0.0/0;
}