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fix(userspace/engine): forcefully set PPME_PLUGINEVENT_E event type for "plugin" source events.

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This workaround an issue in libs, targeting Falco 0.31.0.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

Co-authored-by: Leonardo Grasso <me@leonardograsso.com>
Co-authored-by: Jason Dellaluce <jasondellaluce@gmail.com>
This commit is contained in:
Federico Di Pierro 2022-01-28 12:40:26 +01:00 committed by poiana
parent ce3598f801
commit 70bfb2426c
4 changed files with 32 additions and 9 deletions
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2
userspace/engine/falco_engine.cpp
View File

@ -420,7 +420,7 @@ void falco_engine::add_filter(std::shared_ptr<gen_event_filter> filter,
throw falco_exception(err);
}
it->second->add(rule, tags, filter);
it->second->add(source, rule, tags, filter);
}
bool falco_engine::is_source_valid(const std::string &source)

14
userspace/engine/rules.cpp
View File

@ -145,11 +145,19 @@ int falco_rules::add_filter(lua_State *ls)
lua_pop(ls, 1);
}
size_t num_evttypes = lp->filter()->evttypes().size();
// todo(jasondellaluce,leogr,fededp): temp workaround, remove when fixed in libs
size_t num_evttypes = 1; // assume plugin
if(source == "syscall" || source == "k8s_audit")
{
num_evttypes = lp->filter()->evttypes().size();
}
try {
try
{
rules->add_filter(lp->filter(), rule, source, tags);
} catch (exception &e) {
}
catch (exception &e)
{
std::string errstr = string("Could not add rule to falco engine: ") + e.what();
lua_pushstring(ls, errstr.c_str());
lua_error(ls);

10
userspace/engine/ruleset.cpp
View File

@ -66,7 +66,7 @@ void falco_ruleset::ruleset_filters::remove_wrapper_from_list(filter_wrapper_lis
void falco_ruleset::ruleset_filters::add_filter(std::shared_ptr<filter_wrapper> wrap)
{
std::set<uint16_t> fevttypes = wrap->filter->evttypes();
std::set<uint16_t> fevttypes = wrap->evttypes();
if(fevttypes.empty())
{
@ -91,7 +91,7 @@ void falco_ruleset::ruleset_filters::add_filter(std::shared_ptr<filter_wrapper>
void falco_ruleset::ruleset_filters::remove_filter(std::shared_ptr<filter_wrapper> wrap)
{
std::set<uint16_t> fevttypes = wrap->filter->evttypes();
std::set<uint16_t> fevttypes = wrap->evttypes();
if(fevttypes.empty())
{
@ -147,16 +147,18 @@ void falco_ruleset::ruleset_filters::evttypes_for_ruleset(std::set<uint16_t> &ev
for(auto &wrap : m_filters)
{
auto fevttypes = wrap->filter->evttypes();
auto fevttypes = wrap->evttypes();
evttypes.insert(fevttypes.begin(), fevttypes.end());
}
}
void falco_ruleset::add(string &name,
void falco_ruleset::add(string &source,
string &name,
set<string> &tags,
std::shared_ptr<gen_event_filter> filter)
{
std::shared_ptr<filter_wrapper> wrap(new filter_wrapper());
wrap->source = source;
wrap->name = name;
wrap->tags = tags;
wrap->filter = filter;

15
userspace/engine/ruleset.h
View File

@ -34,7 +34,8 @@ public:
falco_ruleset();
virtual ~falco_ruleset();
void add(std::string &name,
void add(string &source,
std::string &name,
std::set<std::string> &tags,
std::shared_ptr<gen_event_filter> filter);
@ -73,9 +74,21 @@ private:
class filter_wrapper {
public:
std::string source;
std::string name;
std::set<std::string> tags;
std::shared_ptr<gen_event_filter> filter;
std::set<uint16_t> evttypes()
{
// todo(jasondellaluce,leogr): temp workarond, remove when fixed in libs
if(source == "syscall" || source == "k8s_audit")
{
return filter->evttypes();
}
// else assume plugins
return {ppm_event_type::PPME_PLUGINEVENT_E};
// workaround end
}
};
typedef std::list<std::shared_ptr<filter_wrapper>> filter_wrapper_list;