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--- -- This module is designed to parse the <code>PERF_DATA_BLOCK</code> structure, which is -- stored in the registry under HKEY_PERFORMANCE_DATA. By querying this structure, you can -- get a whole lot of information about what's going on. -- -- To use this from a script, see <code>get_performance_data</code>, it is the only -- "public" function in this module. -- -- My primary sources of information were: -- * This 1996 journal by Matt Pietrek: <http://www.microsoft.com/msj/archive/S271.aspx> -- * The followup article: <http://www.microsoft.com/msj/archive/S2A9.aspx> -- * The WinPerf.h header file -- -- And my primary inspiration was PsTools, specifically, <code>pstasklist.exe</code>. -- --@author Ron Bowes <ron@skullsecurity.net> --@copyright Same as Nmap--See http://nmap.org/book/man-legal.html ----------------------------------------------------------------------- local bin = require "bin" local bit = require "bit" local msrpc = require "msrpc" local msrpctypes = require "msrpctypes" local stdnse = require "stdnse" _ENV = stdnse.module("msrpcperformance", stdnse.seeall) ---Parses the title database, which is a series of null-terminated string pairs. -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_title_database(data, pos) local result = {} local i = 1 repeat local number, name pos, number, name = bin.unpack("<zz", data, pos) if(number == nil) then return false, "Couldn't parse the title database: end of string encountered early" elseif(tonumber(number) == nil) then -- Not sure if this actually happens, but it doesn't hurt to check stdnse.print_debug(1, "MSRPC: ERROR: Couldn't parse the title database: string found where number expected (%d: '%s')", i, number) return false, "Couldn't parse the title database" end result[tonumber(number)] = name i = i + 1 until pos >= #data return true, pos, result end ---Parses a PERF_DATA_BLOCK, which has the following definition (from "WinPerf.h" on Visual Studio 8): -- --<code> -- typedef struct _PERF_DATA_BLOCK { -- WCHAR Signature[4]; // Signature: Unicode "PERF" -- DWORD LittleEndian; // 0 = Big Endian, 1 = Little Endian -- DWORD Version; // Version of these data structures -- // starting at 1 -- DWORD Revision; // Revision of these data structures -- // starting at 0 for each Version -- DWORD TotalByteLength; // Total length of data block -- DWORD HeaderLength; // Length of this structure -- DWORD NumObjectTypes; // Number of types of objects -- // being reported -- LONG DefaultObject; // Object Title Index of default -- // object to display when data from -- // this system is retrieved (-1 = -- // none, but this is not expected to -- // be used) -- SYSTEMTIME SystemTime; // Time at the system under -- // measurement -- LARGE_INTEGER PerfTime; // Performance counter value -- // at the system under measurement -- LARGE_INTEGER PerfFreq; // Performance counter frequency -- // at the system under measurement -- LARGE_INTEGER PerfTime100nSec; // Performance counter time in 100 nsec -- // units at the system under measurement -- DWORD SystemNameLength; // Length of the system name -- DWORD SystemNameOffset; // Offset, from beginning of this -- // structure, to name of system -- // being measured -- } PERF_DATA_BLOCK, *PPERF_DATA_BLOCK; --</code> -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_data_block(data, pos) local result = {} pos, result['Signature'] = msrpctypes.unicode_to_string(data, pos, 4, false) if(result['Signature'] ~= "PERF") then return false, "MSRPC: PERF_DATA_BLOCK signature is missing or incorrect" end pos, result['LittleEndian'] = msrpctypes.unmarshall_int32(data, pos) if(result['LittleEndian'] ~= 1) then return false, "MSRPC: PERF_DATA_BLOCK returned a non-understood endianness" end -- Parse the header pos, result['Version'] = msrpctypes.unmarshall_int32(data, pos) pos, result['Revision'] = msrpctypes.unmarshall_int32(data, pos) pos, result['TotalByteLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['HeaderLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['NumObjectTypes'] = msrpctypes.unmarshall_int32(data, pos) pos, result['DefaultObject'] = msrpctypes.unmarshall_int32(data, pos) pos, result['SystemTime'] = msrpctypes.unmarshall_SYSTEMTIME(data, pos) pos, result['PerfTime'] = msrpctypes.unmarshall_int64(data, pos) pos, result['PerfFreq'] = msrpctypes.unmarshall_int64(data, pos) pos, result['PerfTime100nSec'] = msrpctypes.unmarshall_int64(data, pos) pos = pos + 4 -- This value doesn't seem to line up, so add 4 pos, result['SystemNameLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['SystemNameOffset'] = msrpctypes.unmarshall_int32(data, pos) -- Ensure that the system name is directly after the header. This technically shouldn't matter, but Microsoft's documentation -- (in WinPref.h) says that the actual object comes "after the PERF_DATA_BLOCK", so it doesn't make sense that the SystemName -- could be anywhere else. if(pos ~= result['SystemNameOffset'] + 1) then return false, "MSRPC: PERF_DATA_BLOCK has SystemName in the wrong location" end -- Read the system name from the next location (which happens to be identical to SystemNameOffset, on a proper system) pos, result['SystemName'] = msrpctypes.unicode_to_string(data, pos, result['SystemNameLength'] / 2, true) pos = pos + 4 -- Again, we end up not lined up so here we fix it return true, pos, result end ---Parse a PERF_OBJECT_TYPE structure. From Microsoft's documentation: -- --<code> -- // -- // The _PERF_DATA_BLOCK structure is followed by NumObjectTypes of -- // data sections, one for each type of object measured. Each object -- // type section begins with a _PERF_OBJECT_TYPE structure. -- // -- typedef struct _PERF_OBJECT_TYPE { -- DWORD TotalByteLength; // Length of this object definition -- // including this structure, the -- // counter definitions, and the -- // instance definitions and the -- // counter blocks for each instance: -- // This is the offset from this -- // structure to the next object, if -- // any -- DWORD DefinitionLength; // Length of object definition, -- // which includes this structure -- // and the counter definition -- // structures for this object: this -- // is the offset of the first -- // instance or of the counters -- // for this object if there is -- // no instance -- DWORD HeaderLength; // Length of this structure: this -- // is the offset to the first -- // counter definition for this -- // object -- DWORD ObjectNameTitleIndex; -- // Index to name in Title Database -- #ifdef _WIN64 -- DWORD ObjectNameTitle; // Should use this as an offset -- #else -- LPWSTR ObjectNameTitle; // Initially NULL, for use by -- // analysis program to point to -- // retrieved title string -- #endif -- DWORD ObjectHelpTitleIndex; -- // Index to Help in Title Database -- #ifdef _WIN64 -- DWORD ObjectHelpTitle; // Should use this as an offset -- #else -- LPWSTR ObjectHelpTitle; // Initially NULL, for use by -- // analysis program to point to -- // retrieved title string -- #endif -- DWORD DetailLevel; // Object level of detail (for -- // controlling display complexity); -- // will be min of detail levels -- // for all this object's counters -- DWORD NumCounters; // Number of counters in each -- // counter block (one counter -- // block per instance) -- LONG DefaultCounter; // Default counter to display when -- // this object is selected, index -- // starting at 0 (-1 = none, but -- // this is not expected to be used) -- LONG NumInstances; // Number of object instances -- // for which counters are being -- // returned from the system under -- // measurement. If the object defined -- // will never have any instance data -- // structures (PERF_INSTANCE_DEFINITION) -- // then this value should be -1, if the -- // object can have 0 or more instances, -- // but has none present, then this -- // should be 0, otherwise this field -- // contains the number of instances of -- // this counter. -- DWORD CodePage; // 0 if instance strings are in -- // UNICODE, else the Code Page of -- // the instance names -- LARGE_INTEGER PerfTime; // Sample Time in "Object" units -- // -- LARGE_INTEGER PerfFreq; // Frequency of "Object" units in -- // counts per second. -- } PERF_OBJECT_TYPE, *PPERF_OBJECT_TYPE; --</code> -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_object_type(data, pos) local result = {} pos, result['TotalByteLength'] = msrpctypes.unmarshall_int32(data, pos) -- Offset to the next object pos, result['DefinitionLength'] = msrpctypes.unmarshall_int32(data, pos) -- Offset to the first instance (or counter, if no instances) pos, result['HeaderLength'] = msrpctypes.unmarshall_int32(data, pos) -- Offset to the first counter definition pos, result['ObjectNameTitleIndex'] = msrpctypes.unmarshall_int32(data, pos) -- Index in the Title Database pos, result['ObjectNameTitle'] = msrpctypes.unmarshall_int32(data, pos) -- TODO: will this work with 64-bit? pos, result['ObjectHelpTitleIndex'] = msrpctypes.unmarshall_int32(data, pos) -- Index in the Help Database pos, result['ObjectHelpTitle'] = msrpctypes.unmarshall_int32(data, pos) -- TODO: will this workw ith 64-bit? pos, result['DetailLevel'] = msrpctypes.unmarshall_int32(data, pos) pos, result['NumCounters'] = msrpctypes.unmarshall_int32(data, pos) -- The number of counters in each counter block pos, result['DefaultCounter'] = msrpctypes.unmarshall_int32(data, pos) pos, result['NumInstances'] = msrpctypes.unmarshall_int32(data, pos) -- Numer of object instances for which counters are being returned pos, result['CodePage'] = msrpctypes.unmarshall_int32(data, pos) -- 0 if strings are in UNICODE, otherwise the Code Page -- if(result['CodePage'] ~= 0) then -- return false, string.format("Unknown Code Page for data: %d\n", result['CodePage']) -- end pos, result['PerfTime'] = msrpctypes.unmarshall_int64(data, pos) -- Sample time in "Object" units pos, result['PerfFreq'] = msrpctypes.unmarshall_int64(data, pos) -- Frequency of "Object" units in counts/second return true, pos, result end ---Parse a PERF_COUNTER_DEFINITION structure. From Microsoft's documentation: -- --<code> -- // There is one of the following for each of the -- // PERF_OBJECT_TYPE.NumCounters. The Unicode names in this structure MUST -- // come from a message file. -- typedef struct _PERF_COUNTER_DEFINITION { -- DWORD ByteLength; // Length in bytes of this structure -- DWORD CounterNameTitleIndex; -- // Index of Counter name into -- // Title Database -- #ifdef _WIN64 -- DWORD CounterNameTitle; -- #else -- LPWSTR CounterNameTitle; // Initially NULL, for use by -- // analysis program to point to -- // retrieved title string -- #endif -- DWORD CounterHelpTitleIndex; -- // Index of Counter Help into -- // Title Database -- #ifdef _WIN64 -- DWORD CounterHelpTitle; -- #else -- LPWSTR CounterHelpTitle; // Initially NULL, for use by -- // analysis program to point to -- // retrieved title string -- #endif -- LONG DefaultScale; // Power of 10 by which to scale -- // chart line if vertical axis is 100 -- // 0 ==> 1, 1 ==> 10, -1 ==>1/10, etc. -- DWORD DetailLevel; // Counter level of detail (for -- // controlling display complexity) -- DWORD CounterType; // Type of counter -- DWORD CounterSize; // Size of counter in bytes -- DWORD CounterOffset; // Offset from the start of the -- // PERF_COUNTER_BLOCK to the first -- // byte of this counter -- } PERF_COUNTER_DEFINITION, *PPERF_COUNTER_DEFINITION; --</code> -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_counter_definition(data, pos) local result = {} local initial_pos = pos pos, result['ByteLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterNameTitleIndex'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterNameTitle'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterHelpTitleIndex'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterHelpTitle'] = msrpctypes.unmarshall_int32(data, pos) pos, result['DefaultScale'] = msrpctypes.unmarshall_int32(data, pos) pos, result['DetailLevel'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterType'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterSize'] = msrpctypes.unmarshall_int32(data, pos) pos, result['CounterOffset'] = msrpctypes.unmarshall_int32(data, pos) pos = initial_pos + result['ByteLength'] return true, pos, result end ---Parse the actual counter value. This is a fairly simple function, it takes a counter -- definition and pulls out data based on it. -- -- Note: I don't think this is doing the 8-byte values right, I suspect that they're supposed -- to be doubles. -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@param counter_definition The matching counter_definition. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_counter(data, pos, counter_definition) local result if(counter_definition['CounterSize'] == 4) then pos, result = msrpctypes.unmarshall_int32(data, pos) elseif(counter_definition['CounterSize'] == 8) then pos, result = msrpctypes.unmarshall_int64(data, pos) -- pos, result = bin.unpack("<d", data, pos) else pos, result = msrpctypes.unmarshall_raw(data, pos, counter_definition['CounterSize']) end return true, pos, result end ---Parse a PERF_INSTANCE_DEFINITION structure. From Microsoft's documentation: -- --<code> -- // If (PERF_DATA_BLOCK.NumInstances >= 0) then there will be -- // PERF_DATA_BLOCK.NumInstances of a (PERF_INSTANCE_DEFINITION -- // followed by a PERF_COUNTER_BLOCK followed by the counter data fields) -- // for each instance. -- // -- // If (PERF_DATA_BLOCK.NumInstances < 0) then the counter definition -- // strucutre above will be followed by only a PERF_COUNTER_BLOCK and the -- // counter data for that COUNTER. -- typedef struct _PERF_INSTANCE_DEFINITION { -- DWORD ByteLength; // Length in bytes of this structure, -- // including the subsequent name -- DWORD ParentObjectTitleIndex; -- // Title Index to name of "parent" -- // object (e.g., if thread, then -- // process is parent object type); -- // if logical drive, the physical -- // drive is parent object type -- DWORD ParentObjectInstance; -- // Index to instance of parent object -- // type which is the parent of this -- // instance. -- LONG UniqueID; // A unique ID used instead of -- // matching the name to identify -- // this instance, -1 = none -- DWORD NameOffset; // Offset from beginning of -- // this struct to the Unicode name -- // of this instance -- DWORD NameLength; // Length in bytes of name; 0 = none -- // this length includes the characters -- // in the string plus the size of the -- // terminating NULL char. It does not -- // include any additional pad bytes to -- // correct structure alignment -- } PERF_INSTANCE_DEFINITION, *PPERF_INSTANCE_DEFINITION; --</code> -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_instance_definition(data, pos) local result = {} -- Remember where we started. I noticed that where the counter part starts can move around, so we have to -- determine it by adding ByteLength to the initial position local initial_pos = pos pos, result['ByteLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['ParentObjectTitleIndex'] = msrpctypes.unmarshall_int32(data, pos) pos, result['ParentObjectInstance'] = msrpctypes.unmarshall_int32(data, pos) pos, result['UniqueID'] = msrpctypes.unmarshall_int32(data, pos) pos, result['NameOffset'] = msrpctypes.unmarshall_int32(data, pos) pos, result['NameLength'] = msrpctypes.unmarshall_int32(data, pos) pos, result['InstanceName'] = msrpctypes.unicode_to_string(data, pos, result['NameLength'] / 2, true) pos = initial_pos + result['ByteLength'] return true, pos, result end ---Parse a PERF_COUNTER_BLOCK structure. From Microsoft's documentation: -- --<code> -- typedef struct _PERF_COUNTER_BLOCK { -- DWORD ByteLength; // Length in bytes of this structure, -- // including the following counters -- } PERF_COUNTER_BLOCK, *PPERF_COUNTER_BLOCK; -- --</code> -- --@param data The data being processed. --@param pos The position within <code>data</code>. --@return (status, pos, result) The status (true if successful), the new position in <code>data</code> (or an error -- message), and a table representing the datatype, if any. local function parse_perf_counter_block(data, pos) local result = {} pos, result['ByteLength'] = msrpctypes.unmarshall_int32(data, pos) return true, pos, result end ---Retrieve the parsed performance data from the given host for the requested object values. To get a list of possible -- object values, leave 'objects' blank and look at <code>result['title_database']</code> -- it'll contain a list of -- indexes that can be looked up. These indexes are passed as a string or as a series of space-separated strings (eg, -- "230" for "Process" and "238" for "Process" and "Processor"). -- --@param host The host object --@param objects [optional] The space-separated list of object numbers to retrieve. Default: only retrieve the database. function get_performance_data(host, objects) -- Create the SMB session local status, smbstate = msrpc.start_smb(host, msrpc.WINREG_PATH) if(status == false) then return false, smbstate end -- Bind to WINREG service local status, bind_result = msrpc.bind(smbstate, msrpc.WINREG_UUID, msrpc.WINREG_VERSION, nil) if(status == false) then msrpc.stop_smb(smbstate) return false, bind_result end -- Open HKEY_PERFORMANCE_DATA local status, openhkpd_result = msrpc.winreg_openhkpd(smbstate) if(status == false) then msrpc.stop_smb(smbstate) return false, openhkpd_result end local status, queryvalue_result = msrpc.winreg_queryvalue(smbstate, openhkpd_result['handle'], "Counter 009") if(status == false) then msrpc.stop_smb(smbstate) return false, queryvalue_result end -- Parse the title database local pos = 1 local status local result = {} status, pos, result['title_database'] = parse_perf_title_database(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end result['title_database'][0] = "<null>" if(objects ~= nil and #objects > 0) then -- Query for the objects local status, queryvalue_result = msrpc.winreg_queryvalue(smbstate, openhkpd_result['handle'], objects) if(status == false) then msrpc.stop_smb(smbstate) return false, queryvalue_result end -- Parse the header pos = 1 local status, data_block status, pos, data_block = parse_perf_data_block(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end -- Move past the header pos = 1 + data_block['HeaderLength'] -- Parse the data sections for i = 1, data_block['NumObjectTypes'], 1 do local object_start = pos local counter_definitions = {} local object_instances = {} local counter_definitions = {} -- Get the type of the object (this is basically the class definition -- info about the object instances) local status, object_type status, pos, object_type = parse_perf_object_type(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end -- Start setting up the result object --stdnse.print_debug("Index = %d\n", object_type['ObjectNameTitleIndex']) local object_name = result['title_database'][object_type['ObjectNameTitleIndex']] result[object_name] = {} --stdnse.print_debug("\n\nOBJECT: %s\n", object_name) --stdnse.print_debug(" Counters: %d\n", object_type['NumCounters']) --stdnse.print_debug(" Instances: %d\n", object_type['NumInstances']) --stdnse.print_debug("-----------------\n") -- Bring the position to the beginning of the counter definitions pos = object_start + object_type['HeaderLength'] -- Parse the counter definitions for j = 1, object_type['NumCounters'], 1 do status, pos, counter_definitions[j] = parse_perf_counter_definition(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end --stdnse.print_debug(" Counter definition #%2d: [%d bytes] %s\n", j, counter_definitions[j]['CounterSize'], result['title_database'][counter_definitions[j]['CounterNameTitleIndex']]) end -- Bring the position to the beginning of the instances (or counters) pos = object_start + object_type['DefinitionLength'] -- Check if we have any instances (sometimes we don't -- if we don't, the value returned is a negative) if(bit.band(object_type['NumInstances'], 0x80000000) == 0) then -- Parse the object instances and counters for j = 1, object_type['NumInstances'], 1 do local instance_start = pos -- Instance definition local status status, pos, object_instances[j] = parse_perf_instance_definition(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end -- Set up the instance array local instance_name = object_instances[j]['InstanceName'] result[object_name][instance_name] = {} -- Bring the pos to the start of the counter block pos = instance_start + object_instances[j]['ByteLength'] --stdnse.print_debug("\n INSTANCE: %s\n", instance_name) --stdnse.print_debug(" Length: %d\n", object_instances[j]['ByteLength']) --stdnse.print_debug(" NameOffset: %d\n", object_instances[j]['NameOffset']) --stdnse.print_debug(" NameLength: %d\n", object_instances[j]['NameLength']) --stdnse.print_debug(" --------------\n") -- The counter block local status, counter_block status, pos, counter_block = parse_perf_counter_block(queryvalue_result['value'], pos) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end for k = 1, object_type['NumCounters'], 1 do -- Each individual counter local status, counter_result status, pos, counter_result = parse_perf_counter(queryvalue_result['value'], pos, counter_definitions[k]) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end local counter_name = result['title_database'][counter_definitions[k]['CounterNameTitleIndex']] --stdnse.print_debug(" %s: %s\n", counter_name, counter_result) -- Save it in the result result[object_name][instance_name][counter_name] = counter_result end -- Bring the pos to the end of the next section pos = instance_start + object_instances[j]['ByteLength'] + counter_block['ByteLength'] end else for k = 1, object_type['NumCounters'], 1 do -- Each individual counter local status, counter_result status, pos, counter_result = parse_perf_counter(queryvalue_result['value'], pos, counter_definitions[k]) if(status == false) then msrpc.stop_smb(smbstate) return false, pos end local counter_name = result['title_database'][counter_definitions[k]['CounterNameTitleIndex']] --stdnse.print_debug(" %s: %s\n", counter_name, counter_result) -- Save it in the result result[object_name][counter_name] = counter_result end end end -- Blank out the database result['title_database'] = nil end msrpc.stop_smb(smbstate) return true, result end return _ENV;