mirror of
https://github.com/zeek/zeek.git
synced 2025-10-13 03:58:20 +00:00
extend and refactor several fields
This commit is contained in:
Palumbo Mauro
parent
19fd5f66e8
commit
411908a102
8 changed files with 209 additions and 178 deletions
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@ -1,12 +1,10 @@
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# Generated by binpac_quickstart
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include(BroPlugin)
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include_directories(BEFORE ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
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bro_plugin_begin(Bro NTP)
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bro_plugin_cc(NTP.cc Plugin.cc)
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bro_plugin_bif(types.bif)
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bro_plugin_bif(events.bif)
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bro_plugin_pac(ntp.pac ntp-analyzer.pac ntp-mode7.pac ntp-protocol.pac)
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bro_plugin_cc(NTP.cc Plugin.cc)
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bro_plugin_bif(types.bif events.bif)
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bro_plugin_pac(ntp.pac ntp-analyzer.pac ntp-mode7.pac ntp-protocol.pac)
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bro_plugin_end()
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@ -1,5 +1,3 @@
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// Generated by binpac_quickstart
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#include "NTP.h"
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#include "Reporter.h"
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@ -9,12 +7,9 @@
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using namespace analyzer::NTP;
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NTP_Analyzer::NTP_Analyzer(Connection* c)
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: analyzer::Analyzer("NTP", c)
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: analyzer::Analyzer("NTP", c)
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{
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interp = new binpac::NTP::NTP_Conn(this);
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}
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NTP_Analyzer::~NTP_Analyzer()
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@ -24,13 +19,11 @@ NTP_Analyzer::~NTP_Analyzer()
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void NTP_Analyzer::Done()
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{
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Analyzer::Done();
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}
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void NTP_Analyzer::DeliverPacket(int len, const u_char* data,
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bool orig, uint64 seq, const IP_Hdr* ip, int caplen)
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bool orig, uint64 seq, const IP_Hdr* ip, int caplen)
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{
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Analyzer::DeliverPacket(len, data, orig, seq, ip, caplen);
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@ -1,5 +1,3 @@
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// Generated by binpac_quickstart
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#ifndef ANALYZER_PROTOCOL_NTP_NTP_H
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#define ANALYZER_PROTOCOL_NTP_NTP_H
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@ -12,29 +10,23 @@
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namespace analyzer { namespace NTP {
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class NTP_Analyzer
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: public analyzer::Analyzer {
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class NTP_Analyzer : public analyzer::Analyzer {
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public:
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NTP_Analyzer(Connection* conn);
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virtual ~NTP_Analyzer();
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explicit NTP_Analyzer(Connection* conn);
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~NTP_Analyzer() override;
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// Overriden from Analyzer.
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virtual void Done();
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virtual void DeliverPacket(int len, const u_char* data, bool orig,
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uint64 seq, const IP_Hdr* ip, int caplen);
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void Done() override;
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void DeliverPacket(int len, const u_char* data, bool orig,
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uint64 seq, const IP_Hdr* ip, int caplen) override;
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static analyzer::Analyzer* InstantiateAnalyzer(Connection* conn)
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static analyzer::Analyzer* Instantiate(Connection* conn)
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{ return new NTP_Analyzer(conn); }
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protected:
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binpac::NTP::NTP_Conn* interp;
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};
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} } // namespace analyzer::*
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} } // namespace analyzer::*
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#endif
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@ -1,4 +1,4 @@
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// Generated by binpac_quickstart
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// See the file in the main distribution directory for copyright.
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#include "plugin/Plugin.h"
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@ -11,15 +11,14 @@ class Plugin : public plugin::Plugin {
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public:
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plugin::Configuration Configure()
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{
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AddComponent(new ::analyzer::Component("NTP",
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::analyzer::NTP::NTP_Analyzer::InstantiateAnalyzer));
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AddComponent(new ::analyzer::Component("NTP", ::analyzer::NTP::NTP_Analyzer::Instantiate));
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plugin::Configuration config;
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config.name = "Bro::NTP";
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config.description = "Network Time Protocol analyzer";
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config.description = "NTP analyzer";
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return config;
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}
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} plugin;
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}
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}
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}
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@ -1,9 +1,15 @@
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## Generated for NTP time synchronization messages
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## Generated for all NTP messages. Different from many other of Bro's events,
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## this one is generated for both client-side and server-side messages.
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##
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## For more information about NTP, refer to :rfc:`5905`
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## See `Wikipedia <http://en.wikipedia.org/wiki/Network_Time_Protocol>`__ for
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## more information about the NTP protocol.
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##
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## c: The connection
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## c: The connection record describing the corresponding UDP flow.
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##
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## msg: The NTP message record
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## is_orig:
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##
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## msg: The parsed NTP message.
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##
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## .. zeek:see::
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##
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event ntp_message%(c: connection, is_orig: bool, msg: NTP::Message%);
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@ -1,91 +1,131 @@
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%extern{
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#include <math.h>
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#define FRAC_16 pow(2,-16)
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#define FRAC_32 pow(2,-32)
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// NTP defines the epoch from 1900, not 1970
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#define EPOCH_OFFSET -2208988800
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#include <math.h>
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#define FRAC_16 pow(2,-16)
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#define FRAC_32 pow(2,-32)
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// NTP defines the epoch from 1900, not 1970
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#define EPOCH_OFFSET -2208988800
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%}
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%header{
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Val* proc_ntp_short(const NTP_Short_Time* t);
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Val* proc_ntp_timestamp(const NTP_Time* t);
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Val* proc_ntp_short(const NTP_Short_Time* t);
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Val* proc_ntp_timestamp(const NTP_Time* t);
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%}
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%code{
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Val* proc_ntp_short(const NTP_Short_Time* t)
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Val* proc_ntp_short(const NTP_Short_Time* t)
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{
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if ( t->seconds() == 0 && t->fractions() == 0 )
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return new Val(0.0, TYPE_INTERVAL);
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return new Val(t->seconds() + t->fractions()*FRAC_16, TYPE_INTERVAL);
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if ( t->seconds() == 0 && t->fractions() == 0 )
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return new Val(0.0, TYPE_INTERVAL);
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return new Val(t->seconds() + t->fractions()*FRAC_16, TYPE_INTERVAL);
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}
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Val* proc_ntp_timestamp(const NTP_Time* t)
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{
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if ( t->seconds() == 0 && t->fractions() == 0)
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return new Val(0.0, TYPE_TIME);
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return new Val(EPOCH_OFFSET + t->seconds() + (t->fractions()*FRAC_32), TYPE_TIME);
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}
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Val* proc_ntp_timestamp(const NTP_Time* t)
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{
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if ( t->seconds() == 0 && t->fractions() == 0)
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return new Val(0.0, TYPE_TIME);
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return new Val(EPOCH_OFFSET + t->seconds() + (t->fractions()*FRAC_32), TYPE_TIME);
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}
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%}
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refine flow NTP_Flow += {
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function proc_ntp_association(msg: NTP_Association): bool
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%{
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RecordVal* rv = new RecordVal(BifType::Record::NTP::Message);
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rv->Assign(0, new Val(${msg.version}, TYPE_COUNT));
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rv->Assign(1, new Val(${msg.mode}, TYPE_COUNT));
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rv->Assign(2, new Val(${msg.stratum}, TYPE_COUNT));
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rv->Assign(3, new Val(pow(2, ${msg.poll}), TYPE_INTERVAL));
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rv->Assign(4, new Val(pow(2, ${msg.precision}), TYPE_INTERVAL));
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rv->Assign(5, proc_ntp_short(${msg.root_delay}));
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rv->Assign(6, proc_ntp_short(${msg.root_dispersion}));
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switch ( ${msg.stratum} )
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{
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case 0:
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// unknown stratum => kiss code
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rv->Assign(7, bytestring_to_val(${msg.reference_id}));
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break;
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case 1:
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// reference clock => ref clock string
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rv->Assign(8, bytestring_to_val(${msg.reference_id}));
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break;
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default:
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// TODO: Check for v4/v6
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const uint8* d = ${msg.reference_id}.data();
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rv->Assign(9, new AddrVal(IPAddr(IPv4, (const uint32*) d, IPAddr::Network)));
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break;
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}
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# This builds the standard msg record
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function BuildNTPStdMsg(nsm: NTP_std_msg): BroVal
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%{
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RecordVal* rv = new RecordVal(BifType::Record::NTP::std);
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rv->Assign(11, proc_ntp_timestamp(${msg.reference_ts}));
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rv->Assign(12, proc_ntp_timestamp(${msg.origin_ts}));
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rv->Assign(13, proc_ntp_timestamp(${msg.receive_ts}));
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rv->Assign(14, proc_ntp_timestamp(${msg.transmit_ts}));
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rv->Assign(0, new Val(${nsm.stratum}, TYPE_COUNT));
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rv->Assign(1, new Val(pow(2, ${nsm.poll}), TYPE_INTERVAL));
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rv->Assign(2, new Val(pow(2, ${nsm.precision}), TYPE_INTERVAL));
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rv->Assign(3, proc_ntp_short(${nsm.root_delay}));
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rv->Assign(4, proc_ntp_short(${nsm.root_dispersion}));
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rv->Assign(17, new Val((uint32) ${msg.extensions}->size(), TYPE_COUNT));
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switch ( ${nsm.stratum} )
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{
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case 0:
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// unknown stratum => kiss code
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rv->Assign(7, bytestring_to_val(${nsm.reference_id}));
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break;
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case 1:
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// reference clock => ref clock string
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rv->Assign(8, bytestring_to_val(${nsm.reference_id}));
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break;
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default:
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// TODO: Check for v4/v6
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const uint8* d = ${nsm.reference_id}.data();
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rv->Assign(9, new AddrVal(IPAddr(IPv4, (const uint32*) d, IPAddr::Network)));
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break;
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}
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BifEvent::generate_ntp_message(connection()->bro_analyzer(),
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connection()->bro_analyzer()->Conn(),
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is_orig(), rv);
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return true;
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%}
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rv->Assign(9, proc_ntp_timestamp(${nsm.reference_ts}));
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rv->Assign(10, proc_ntp_timestamp(${nsm.origin_ts}));
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rv->Assign(11, proc_ntp_timestamp(${nsm.receive_ts}));
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rv->Assign(12, proc_ntp_timestamp(${nsm.transmit_ts}));
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function proc_ntp_mode6(msg: NTP_Mode6): bool
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%{
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BifEvent::generate_ntp_mode6_message(connection()->bro_analyzer(),
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connection()->bro_analyzer()->Conn(),
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is_orig(), ${msg.opcode});
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return true;
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%}
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rv->Assign(15, new Val((uint32) ${nsm.extensions}->size(), TYPE_COUNT));
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function proc_ntp_mode7(msg: NTP_Mode7): bool
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%{
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BifEvent::generate_ntp_mode7_message(connection()->bro_analyzer(),
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connection()->bro_analyzer()->Conn(),
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is_orig(), ${msg.request_code});
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return true;
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%}
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return rv;
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%}
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# This builds the control msg record
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function BuildNTPControlMsg(ncm: NTP_control_msg): BroVal
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%{
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RecordVal* rv = new RecordVal(BifType::Record::NTP::control);
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rv->Assign(0, new Val(${ncm.OpCode}, TYPE_COUNT));
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rv->Assign(1, new Val(${ncm.R}, TYPE_BOOL));
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rv->Assign(2, new Val(${ncm.E}, TYPE_BOOL));
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rv->Assign(3, new Val(${ncm.M}, TYPE_BOOL));
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rv->Assign(4, new Val(${ncm.sequence}, TYPE_COUNT));
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rv->Assign(5, new Val(${ncm.status}, TYPE_COUNT));
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rv->Assign(6, new Val(${ncm.association_id}, TYPE_COUNT));
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rv->Assign(7, new Val(${ncm.offs}, TYPE_COUNT));
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rv->Assign(8, new Val(${ncm.c}, TYPE_COUNT));
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rv->Assign(9, bytestring_to_val(${ncm.data}));
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return rv;
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%}
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# This builds the mode7 msg record
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function BuildNTPMode7Msg(m7: NTP_mode7_msg): BroVal
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%{
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RecordVal* rv = new RecordVal(BifType::Record::NTP::mode7);
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rv->Assign(0, new Val(${m7.request_code}, TYPE_COUNT));
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rv->Assign(1, new Val(${m7.auth_bit}, TYPE_BOOL));
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rv->Assign(2, new Val(${m7.sequence}, TYPE_COUNT));
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rv->Assign(3, new Val(${m7.implementation}, TYPE_COUNT));
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rv->Assign(4, new Val(${m7.error_code}, TYPE_COUNT));
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rv->Assign(5, bytestring_to_val(${m7.data}));
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return rv;
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%}
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function proc_ntp_message(msg: NTP_PDU): bool
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%{
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RecordVal* rv = new RecordVal(BifType::Record::NTP::Message);
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rv->Assign(0, new Val(${msg.version}, TYPE_COUNT));
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rv->Assign(1, new Val(${msg.mode}, TYPE_COUNT));
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// The standard record
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if ( ${msg.mode}>0 && ${msg.mode}<6 ) {
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rv->Assign(2, BuildNTPStdMsg(${msg.std}));
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} else if ( ${msg.mode}==6 ) {
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rv->Assign(3, BuildNTPControlMsg(${msg.control}));
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} else if ( ${msg.mode}==7 ) {
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rv->Assign(4, BuildNTPMode7Msg(${msg.mode7}));
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}
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BifEvent::generate_ntp_message(connection()->bro_analyzer(), connection()->bro_analyzer()->Conn(), is_orig(), rv);
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return true;
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%}
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};
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refine typeattr NTP_Association += &let {
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proc: bool = $context.flow.proc_ntp_association(this);
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refine typeattr NTP_PDU += &let {
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proc: bool = $context.flow.proc_ntp_message(this);
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};
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@ -1,49 +1,71 @@
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# This is the common part in the header format.
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# See RFC 5905 for details
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type NTP_PDU(is_orig: bool) = record {
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first_byte : uint8;
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# Modes 1-5 are standard NTP time sync
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mode_chk_1 : case (mode>=1 && mode<=5) of {
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true -> msg: NTP_Association(first_byte, mode, version);
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false -> unk: empty;
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} &requires(version);
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mode_chk_2 : case (mode) of {
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6 -> ctl_msg : NTP_Mode6(first_byte, version) &restofdata;
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7 -> mode_7 : NTP_Mode7(first_byte, version) &restofdata;
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default -> unknown: bytestring &restofdata;
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} &requires(version);
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# The first byte of the NTP header contains the leap indicator,
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# the version and the mode
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first_byte : uint8;
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# Modes 1-5 are standard NTP time sync
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standard_modes : case (mode>=1 && mode<=5) of {
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true -> std : NTP_std_msg;
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false -> emp : empty;
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};
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modes_6_7 : case (mode) of {
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# mode 6 is for control messages (format is different from modes 6-7)
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6 -> control : NTP_control_msg;
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# mode 7 is reserved or private (and implementation dependent). For example used for some commands such as MONLIST
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7 -> mode7 : NTP_mode7_msg;
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default -> unknown : bytestring &restofdata;
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};
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} &let {
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mode: uint8 = (first_byte & 0x7); # Bytes 6-8 of 8-byte value
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version: uint8 = (first_byte & 0x38) >> 3; # Bytes 3-5 of 8-byte value
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} &byteorder=bigendian;
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leap: uint8 = (first_byte & 0xc0)>>6; # First 2 bits of 8-bits value
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version: uint8 = (first_byte & 0x38)>>3; # Bits 3-5 of 8-bits value
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mode: uint8 = (first_byte & 0x07); # Bits 6-8 of 8-bits value
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} &byteorder=bigendian &exportsourcedata;
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type NTP_Association(first_byte: uint8, mode: uint8, version: uint8) = record {
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stratum : uint8;
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poll : int8;
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precision : int8;
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|
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root_delay : NTP_Short_Time;
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root_dispersion: NTP_Short_Time;
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reference_id : bytestring &length=4;
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reference_ts : NTP_Time;
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origin_ts : NTP_Time;
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receive_ts : NTP_Time;
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transmit_ts : NTP_Time;
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# This is the most common type of message, corresponding to modes 1-5
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# This kind of msg are used for normal operation of syncronization
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# See RFC 5905 for details
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type NTP_std_msg = record {
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stratum : uint8;
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poll : int8;
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precision : int8;
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extensions : Extension_Field[] &until($input.length() <= 18);
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have_mac : case (offsetof(have_mac) < length) of {
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true -> mac : NTP_MAC;
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false -> nil : empty;
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} &requires(length);
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root_delay : NTP_Short_Time;
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root_dispersion: NTP_Short_Time;
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reference_id : bytestring &length=4;
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reference_ts : NTP_Time;
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origin_ts : NTP_Time;
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receive_ts : NTP_Time;
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transmit_ts : NTP_Time;
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extensions : Extension_Field[] &until($input.length() <= 18);
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have_mac : case (offsetof(have_mac) < length) of {
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true -> mac : NTP_MAC;
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false -> nil : empty;
|
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} &requires(length);
|
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} &let {
|
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leap: bool = (first_byte & 0xc0); # First 2 bytes of 8-byte value
|
||||
leap_61: bool = (leap & 0x40) > 0; # leap_indicator == 1
|
||||
leap_59: bool = (leap & 0x80) > 0; # leap_indicator == 2
|
||||
leap_unk: bool = (leap & 0xc0) > 0; # leap_indicator == 3
|
||||
length = sourcedata.length();
|
||||
} &exportsourcedata;
|
||||
length = sourcedata.length();
|
||||
} &byteorder=bigendian &exportsourcedata;
|
||||
|
||||
# This format is for mode==6, control msg
|
||||
# See RFC 1119 for details
|
||||
type NTP_control_msg = record {
|
||||
second_byte : uint8;
|
||||
sequence : uint16;
|
||||
status : uint16; #TODO: this must be further specified
|
||||
association_id : uint16;
|
||||
offs : uint16;
|
||||
c : uint16;
|
||||
data : bytestring &restofdata;
|
||||
#auth : #TODO
|
||||
} &let {
|
||||
R: bool = (second_byte & 0x80) > 0; # First bit of 8-bits value
|
||||
E: bool = (second_byte & 0x40) > 0; # Second bit of 8-bits value
|
||||
M: bool = (second_byte & 0x20) > 0; # Third bit of 8-bits value
|
||||
OpCode: uint8 = (second_byte & 0x1F); # Last 5 bits of 8-bits value
|
||||
} &byteorder=bigendian &exportsourcedata;
|
||||
|
||||
|
||||
type NTP_MAC = record {
|
||||
key_id: uint32;
|
||||
|
|
@ -51,37 +73,17 @@ type NTP_MAC = record {
|
|||
} &length=18;
|
||||
|
||||
type Extension_Field = record {
|
||||
field_type: uint16;
|
||||
length : uint16;
|
||||
data : bytestring &length=length-4;
|
||||
field_type: uint16;
|
||||
length : uint16;
|
||||
data : bytestring &length=length-4;
|
||||
};
|
||||
|
||||
type NTP_Short_Time = record {
|
||||
seconds: int16;
|
||||
fractions: int16;
|
||||
seconds: int16;
|
||||
fractions: int16;
|
||||
};
|
||||
|
||||
type NTP_Time = record {
|
||||
seconds: uint32;
|
||||
fractions: uint32;
|
||||
};
|
||||
|
||||
|
||||
# From RFC 1305, Appendix B:
|
||||
type NTP_Mode6(first_byte: uint8, version: uint8) = record {
|
||||
rem_op : uint8;
|
||||
sequence: uint16;
|
||||
status : uint16;
|
||||
assoc_id: uint16;
|
||||
offset : uint16;
|
||||
count : uint16;
|
||||
data : bytestring &length=count;
|
||||
pad : padding[pad_length];
|
||||
opt_auth: bytestring &restofdata;
|
||||
} &let {
|
||||
response_bit: bool = (rem_op & 0x80) > 0;
|
||||
error_bit : bool = (rem_op & 0x40) > 0;
|
||||
more_bit : bool = (rem_op & 0x20) > 0;
|
||||
opcode : uint8 = (rem_op & 0x1f);
|
||||
pad_length : uint8 = (count % 32 == 0) ? 0 : 32 - (count % 32);
|
||||
seconds: uint32;
|
||||
fractions: uint32;
|
||||
};
|
||||
|
|
|
|||
|
|
@ -1,5 +1,6 @@
|
|||
module NTP;
|
||||
|
||||
type NTP::std: record;
|
||||
type NTP::control: record;
|
||||
type NTP::mode7: record;
|
||||
type NTP::Message: record;
|
||||
|
||||
module GLOBAL;
|
||||
Loading…
Add table
Add a link
Reference in a new issue