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Support for log filter policy hooks

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This adds a "policy" hook into the logging framework's streams and
filters to replace the existing log filter predicates. The hook
signature is as follows:

    hook(rec: any, id: Log::ID, filter: Log::Filter);

The logging manager invokes hooks on each log record. Hooks can veto
log records via a break, and modify them if necessary. Log filters
inherit the stream-level hook, but can override or remove the hook as
needed.

The distribution's existing log streams now come with pre-defined
hooks that users can add handlers to. Their name is standardized as
"log_policy" by convention, with additional suffixes when a module
provides multiple streams. The following adds a handler to the Conn
module's default log policy hook:

    hook Conn::log_policy(rec: Conn::Info, id: Log::ID, filter: Log::Filter)
            {
            if ( some_veto_reason(rec) )
                break;
            }

By default, this handler will get invoked for any log filter
associated with the Conn::LOG stream.

The existing predicates are deprecated for removal in 4.1 but continue
to work.
This commit is contained in:
Christian Kreibich 2020-09-21 16:09:36 -07:00
parent c8545c85d8
commit 1bd658da8f
61 changed files with 289 additions and 85 deletions
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4
scripts/base/frameworks/intel/main.zeek
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@ -10,6 +10,8 @@ module Intel;
export {
redef enum Log::ID += { LOG };
global log_policy: Log::PolicyHook;
## Enum type to represent various types of intelligence data.
type Type: enum {
## An IP address.
@ -225,7 +227,7 @@ global min_data_store: MinDataStore &redef;
event zeek_init() &priority=5
{
Log::create_stream(LOG, [$columns=Info, $ev=log_intel, $path="intel"]);
Log::create_stream(LOG, [$columns=Info, $ev=log_intel, $path="intel", $policy=log_policy]);
}
# Function that abstracts expiration of different types.