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First prototype of new analyzer framework.

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This is a larger internal change that moves the analyzer
infrastructure to a more flexible model where the available analyzers
don't need to be hardcoded at compile time anymore. While currently
they actually still are, this will in the future enable external
analyzer plugins. For now, it does already add the capability to
dynamically enable/disable analyzers from script-land, replacing the
old Analyzer::Available() methods.

There are three major parts going into this:

    - A new plugin infrastructure in src/plugin. This is independent
      of analyzers and will eventually support plugins for other parts
      of Bro as well (think: readers and writers). The goal is that
      plugins can be alternatively compiled in statically or loadead
      dynamically at runtime from a shared library. While the latter
      isn't there yet, there'll be almost no code change for a plugin
      to make it dynamic later (hopefully :)

    - New analyzer infrastructure in src/analyzer. I've moved a number
      of analyzer-related classes here, including Analyzer and DPM;
      the latter now renamed to Analyzer::Manager. More will move here
      later. Currently, there's only one plugin here, which provides
      *all* existing analyzers. We can modularize this further in the
      future (or not).

    - A new script interface in base/framework/analyzer. I think that
      this will eventually replace the dpm framework, but for now
      that's still there as well, though some parts have moved over.

I've also remove the dpd_config table; ports are now configured via
the analyzer framework. For exmaple, for SSH:

    const ports = { 22/tcp } &redef;

    event bro_init() &priority=5
        {
        ...
        Analyzer::register_for_ports(Analyzer::ANALYZER_SSH, ports);
        }

As you can see, the old ANALYZER_SSH constants have more into an enum
in the Analyzer namespace.

This is all hardly tested right now, and not everything works yet.
There's also a lot more cleanup to do (moving more classes around;
removing no longer used functionality; documenting script and C++
interfaces; regression tests). But it seems to generally work with a
small trace at least.

The debug stream "dpm" shows more about the loaded/enabled analyzers.

A new option -N lists loaded plugins and what they provide (including
those compiled in statically; i.e., right now it outputs all the
analyzers).

This is all not cast-in-stone yet, for some things we need to see if
they make sense this way. Feedback welcome.
This commit is contained in:
Robin Sommer 2013-03-20 13:32:36 -07:00
parent 9caf6e4884
commit af1809aaa3
166 changed files with 2717 additions and 1642 deletions
Download patch file Download diff file Expand all files Collapse all files

39
scripts/policy/frameworks/dpd/detect-protocols.bro
View file

@ -21,22 +21,22 @@ export {
type dir: enum { NONE, INCOMING, OUTGOING, BOTH };
const valids: table[count, addr, port] of dir = {
const valids: table[Analyzer::Tag, addr, port] of dir = {
# A couple of ports commonly used for benign HTTP servers.
# For now we want to see everything.
# [ANALYZER_HTTP, 0.0.0.0, 81/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 82/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 83/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 88/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 8001/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 8090/tcp] = OUTGOING,
# [ANALYZER_HTTP, 0.0.0.0, 8081/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 81/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 82/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 83/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 88/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 8001/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 8090/tcp] = OUTGOING,
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 8081/tcp] = OUTGOING,
#
# [ANALYZER_HTTP, 0.0.0.0, 6346/tcp] = BOTH, # Gnutella
# [ANALYZER_HTTP, 0.0.0.0, 6347/tcp] = BOTH, # Gnutella
# [ANALYZER_HTTP, 0.0.0.0, 6348/tcp] = BOTH, # Gnutella
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 6346/tcp] = BOTH, # Gnutella
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 6347/tcp] = BOTH, # Gnutella
# [Analyzer::ANALYZER_HTTP, 0.0.0.0, 6348/tcp] = BOTH, # Gnutella
} &redef;
# Set of analyzers for which we suppress Server_Found notices
@ -44,8 +44,8 @@ export {
# log files, this also saves memory because for these we don't
# need to remember which servers we already have reported, which
# for some can be a lot.
const suppress_servers: set [count] = {
# ANALYZER_HTTP
const suppress_servers: set [Analyzer::Tag] = {
# Analyzer::ANALYZER_HTTP
} &redef;
# We consider a connection to use a protocol X if the analyzer for X
@ -60,7 +60,7 @@ export {
# Entry point for other analyzers to report that they recognized
# a certain (sub-)protocol.
global found_protocol: function(c: connection, analyzer: count,
global found_protocol: function(c: connection, analyzer: Analyzer::Tag,
protocol: string);
# Table keeping reported (server, port, analyzer) tuples (and their
@ -89,7 +89,7 @@ function get_protocol(c: connection, a: count) : protocol
str = |str| > 0 ? fmt("%s/%s", str, p) : p;
}
return [$a=analyzer_name(a), $sub=str];
return [$a=Analyzer::name(a), $sub=str];
}
function fmt_protocol(p: protocol) : string
@ -194,10 +194,10 @@ event connection_state_remove(c: connection)
report_protocols(c);
}
event protocol_confirmation(c: connection, atype: count, aid: count)
event protocol_confirmation(c: connection, atype: Analyzer::Tag, aid: count)
{
# Don't report anything running on a well-known port.
if ( atype in dpd_config && c$id$resp_p in dpd_config[atype]$ports )
if ( c$id$resp_p in Analyzer::registered_ports(atype) )
return;
if ( c$id in conns )
@ -214,11 +214,10 @@ event protocol_confirmation(c: connection, atype: count, aid: count)
}
}
function found_protocol(c: connection, analyzer: count, protocol: string)
function found_protocol(c: connection, analyzer: Analyzer::tag, protocol: string)
{
# Don't report anything running on a well-known port.
if ( analyzer in dpd_config &&
c$id$resp_p in dpd_config[analyzer]$ports )
if ( c$id$resp_p in Analyzer::registered_ports(atype) )
return;
if ( c$id !in protocols )