/usr/share/pyshared/pyew/pyew_core.py is in pyew 2.0-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# -*- coding: latin-1 -*-
"""
Pyew! A Python Tool like the populars radare and *iew
Copyright (C) 2009, Joxean Koret
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import re
import os
import sys
import dis
import time
import pickle
import pprint
import urllib
import operator
import StringIO
from gzip import GzipFile
from config import CODE_ANALYSIS, DEEP_CODE_ANALYSIS, CONFIG_ANALYSIS_TIMEOUT
from hashlib import md5, sha1, sha224, sha256, sha384, sha512, new as hashlib_new
from safer_pickle import SafeUnpickler
try:
import pefile
hasPefile = True
except ImportError:
hasPefile = False
try:
from Elf import Elf
hasElf = True
except ImportError:
hasElf = False
from binascii import unhexlify, hexlify
try:
from pydistorm import Decode, Decode16Bits, Decode32Bits, Decode64Bits
except:
try:
from distorm import Decode, Decode16Bits, Decode32Bits, Decode64Bits
except:
pass
from anal.x86analyzer import CX86CodeAnalyzer
from config import PLUGINS_PATH
FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])
def to_unicode(buf):
ret = ""
for c in buf:
ret += c + "\x00"
return ret
class CDisObj:
def __init__(self):
self.offset = None
self.size = None
self.mnemonic = None
self.instructionHex = None
self.operands = None
class EUnknownDisassemblyType(Exception):
pass
class CStrings:
def __init__(self, buf=None):
self.buf = buf
def getStrings(self, buf=None, unicode=False):
if buf:
self.buf = buf
scanner = re.compile('[\w| |{|}|\[|\]|,|\||\,|.|\-|_|?|/|\$|@|"|''|!|\\|&|\(|\)|\<|\>|\*|\+|\;|\:|\^|\=|\%|\#|\~|\`|\ñ|\ç|\€]{4,}',
re.MULTILINE | re.IGNORECASE)
ret = scanner.findall(self.buf)
return ret
class COffsetString:
def __init__(self):
self.buf = None
self.minsize = 3
self.offset = 4
def searchForStringAt(self, i):
initial = i
ret = self.buf[i:i+1]
while 1:
i += self.offset
tmp = self.buf[i:i+1]
if tmp.isalpha():
ret += tmp
elif tmp == "\x00":
if len(ret) > self.minsize:
return (ret, initial)
else:
return None
elif tmp == "":
return None
else:
return None
def findall(self):
i = 0
ret = []
while 1:
c = self.buf[i:i+1]
if not c:
break
if c.isalpha():
s = self.searchForStringAt(i)
if s is not None:
ret.append(s)
i += len(s[0])*4
else:
i += 1
else:
i += 1
return ret
class CPyew:
def __init__(self, plugins=True, batch=False):
self.debug = False
self.batch = False
self.antidebug = []
self.virtual = False
self.codeanalysis = CODE_ANALYSIS
self.deepcodeanalysis = DEEP_CODE_ANALYSIS
self.offset = 0
self.previousoffset = []
self.lastasmoffset = 0
self.minoffsetsize = 4
self.deltaoffset = 4
self.physical = False
self.format = "raw"
self.buf = None
self.mode = None
self.filename = None
self.processor="intel"
self.f = None
self.type=32
self.lines=40
self.bsize=512
self.hexcolumns=16
self.maxfilesize=1024*1024*1024
self.pe = None
self.elf = None
self.calls = []
self.plugins = {}
self.maxsize = None
self.names = {}
self.imports = {}
self.exports = {}
self.ep = 0
self.case = 'high'
self.database = None
self.names = {}
self.functions = {}
self.functions_address = {}
self.xrefs_to = {}
self.xrefs_from = {}
self.queue = []
self.analyzed = []
self.checking = []
self.tocheck = []
self.antidebug = []
self.function_stats = {}
self.basic_blocks = {}
self.analysis_timeout = CONFIG_ANALYSIS_TIMEOUT
self.warnings = []
self.batch = batch
self.loadPlugins()
def __del__(self):
if self.f:
self.f.close()
def log(self, msg=None, *args):
if not self.batch:
if msg and args:
print msg, " ".join(map(str, args))
elif msg:
print msg
else:
print
def NextHead(self, offset):
obj = self.disasm(offset, self.processor, self.type, 1)
return offset + obj.size
def GetMnem(self, offset):
return self.GetMnems(offset, num)
def GetMnems(self, offset, num):
obj = self.disasm(offset, self.processor, self.type, num)
ret = []
for x in obj:
ret.append(str(x.mnemonic))
return ret
def getByte(self, offset):
return self.getBytes(offset, 1)
def getBytes(self, offset, num):
moffset = self.offset
self.f.seek(offset)
buf = self.f.read(num)
self.seek(moffset)
return buf
def getVirtualAddressFromOffset(self, offset):
ret = None
if self.format == "PE":
try:
ret = self.pe.OPTIONAL_HEADER.ImageBase + self.pe.get_rva_from_offset(offset)
except:
pass
elif self.format == "ELF":
# XXX: FIXME!!!
ret = offset
return ret
def getOffsetFromVirtualAddress(self, va):
if self.format == "PE":
try:
ret = self.pe.get_offset_from_rva(va-self.pe.OPTIONAL_HEADER.ImageBase)
except:
print sys.exc_info()[1]
return None
return None
def showSettings(self):
for x in dir(self):
if x.startswith("_") or x in ["pe", "elf", "buf"] or operator.isCallable(eval("self." + x)) \
or x in ["plugins", "names", "imports", "exports", "functions_address", \
"names", "functions", "xrefs_from", "xrefs_to", "antidebug", \
"function_stats", "basic_blocks"]:
continue
else:
self.log("pyew." + x.ljust(16) + ":", eval("self." + x))
self.log()
self.log("Pyew Plugins:")
self.log()
for x in self.plugins:
self.log(x.ljust(8), self.plugins[x].__doc__)
def loadFile(self, filename, mode="rb"):
self.filename = filename
self.mode = mode
if self.filename.lower().startswith("http://") or \
self.filename.lower().startswith("https://") or \
self.filename.lower().startswith("ftp://"):
self.physical = False
tmp = urllib.urlopen(self.filename).read()
self.f = StringIO.StringIO(tmp)
self.maxsize = len(tmp)
else:
self.physical = True
self.f = file(filename, mode)
self.maxsize = os.path.getsize(filename)
self.seek(0)
self.fileTypeLoad()
self.offset = 0
def loadFromBuffer(self, buf, filename="<memory>"):
f = StringIO.StringIO(buf)
self.f = f
self.physical = False
self.filename = filename
self.maxsize = len(buf)
self.buf = buf[:self.bsize]
self.fileTypeLoad()
def saveDatabase(self, database):
self.database = database
try:
old_pyew = self
self.filename = old_pyew.f.name
self.f = None
self.plugins = {}
pickle.dump(self, GzipFile(database, "wb"))
self.f = old_pyew.f
self.plugins = old_pyew.plugins
except:
print "Error loading database: %s" % str(sys.exc_info()[1])
self = old_pyew
@staticmethod
def openDatabase(database, mode="rb"):
p = SafeUnpickler(GzipFile(database, "rb"))
new_pyew = p.load()
new_pyew.f = open(new_pyew.filename, mode)
return new_pyew
def fileTypeLoad(self):
try:
if self.buf.startswith("MZ") and hasPefile:
self.loadPE()
elif self.buf.startswith("\x7FELF") and hasElf:
self.loadElf()
elif self.buf.startswith("\xB3\xF2\x0D\x0A"):
self.loadPython()
elif self.buf[:255].find("%PDF-") > -1:
self.loadPDF()
elif self.buf.startswith("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1"):
self.loadOle2()
except:
print "Error loading file:", sys.exc_info()[1]
if self.debug or self.batch:
raise
def loadPDF(self):
self.format = "PDF"
if self.batch:
return
self.log("PDF File")
self.log()
self.plugins["pdf"](self)
def loadOle2(self):
self.format = "OLE2"
if self.batch:
return
self.log("OLE2 File")
self.log()
self.plugins["ole2"](self)
def loadPython(self):
self.format = "PYC"
if self.batch:
return
self.log("Python Compiled File")
self.log()
self.processor="python"
def createIntelFunctionsByPrologs(self):
total = 0
anal=CX86CodeAnalyzer(self)
anal.timeout = self.analysis_timeout
anal.antidebug = self.antidebug
anal.names.update(self.functions)
anal.names.update(self.names)
anal.functions = self.functions
anal.functions_address = self.functions_address
anal.xrefs_to = self.xrefs_to
anal.xrefs_from = self.xrefs_from
anal.basic_blocks = self.basic_blocks
anal.function_stats = self.function_stats
if self.type == 32:
prologs = ["8bff558b", "5589e5"]
else:
prologs = ["40554883ec", "554889e5"]
hints = []
for prolog in prologs:
hints += self.dosearch(self.f, "x", prolog, cols=60, doprint=False, offset=0)
self.log("\b"*80 + "Found %d possible function(s) using method #1" % len(hints) + " "*20 + "\b"*80)
for hint in hints:
anal.doCodeAnalysis(ep = False, addr = int(hint.keys()[0]))
prologs = ["558bec"]
for prolog in prologs:
hints += self.dosearch(self.f, "x", prolog, cols=60, doprint=False, offset=0)
self.log("\b"*80 + "Found %d possible function(s) using method #2" % len(hints) + " "*20)
for hint in hints:
anal.doCodeAnalysis(ep = False, addr = int(hint.keys()[0]))
self.log("\n")
def resolveName(self, ops):
orig = str(ops)
ops = str(ops)
if ops.startswith("["):
ops = ops.replace("[", "").replace("]", "")
try:
ops = int(ops, 16)
except ValueError:
return orig
if ops in self.names:
return self.names[ops]
else:
return orig
def findIntelFunctions(self):
anal = CX86CodeAnalyzer(self, self.type)
anal.timeout = self.analysis_timeout
anal.doCodeAnalysis()
if self.deepcodeanalysis:
self.log("\b"*80 + "Searching typical function's prologs..." + " "*20)
self.createIntelFunctionsByPrologs()
def findFunctions(self, proc):
if proc == "intel":
t = time.time()
self.log("Code Analysis ...")
self.findIntelFunctions()
if self.debug:
self.log("")
self.log("Total time %f second(s)" % (time.time()-t))
def loadElf(self):
if self.physical:
self.elf = Elf(self.filename)
else:
self.elf = Elf(self.getBuffer())
self.format = "ELF"
self.log("ELF Information")
self.log()
if self.elf.e_machine == 62: # x86_64
self.type = 64
self.processor = "intel"
elif self.elf.e_machine == 3: # x86
self.type = 32
self.processor = "intel"
else:
self.log("Warning! Unsupported architecture, defaulting to Intel x86 (32 bits)")
self.type = 32
for x in self.elf.secnames:
if self.elf.e_entry >= self.elf.secnames[x].sh_addr and self.elf.e_entry < self.elf.secnames[x].sh_addr + self.elf.secnames[x].sh_size:
self.ep = self.elf.secnames[x].sh_offset
#self.log("\t", self.elf.secnames[x].name, "0x%08x" % self.elf.secnames[x].sh_addr, self.elf.secnames[x].sh_size)
#self.log()
self.log("Entry Point at 0x%x" % self.ep)
if self.database is None:
self.loadElfFunctions(self.elf)
self.log()
def loadElfFunctions(self, elf):
try:
for x in self.elf.relocs:
self.names[x.r_offset] = x.name
self.imports[x.r_offset] = x.name
for x in self.elf.symbols:
if x.name != "" and x.st_value != 0:
self.names[name] = x.st_value
except:
pass
if self.codeanalysis:
if self.processor == "intel":
self.findFunctions(self.processor)
def loadPeFunctions(self, pe):
imps = False
try:
for entry in self.pe.DIRECTORY_ENTRY_IMPORT:
for imp in entry.imports:
if imp.name:
name = imp.name
else:
name = "#" + str(imp.ordinal)
self.names[imp.address] = str(entry.dll) + "!" + str(name)
self.imports[imp.address] = str(entry.dll) + "!" + str(name)
imps = True
except:
if not self.batch:
print "***Error loading imports", sys.exc_info()[1]
self.warnings.append("Error loading imports: %s" % sys.exc_info()[1])
try:
addr = None
for exp in pe.DIRECTORY_ENTRY_EXPORT.symbols:
try:
addr = self.pe.get_offset_from_rva(exp.address)
except:
addr = exp.address
if exp.name and exp.name != "":
self.names[addr] = exp.name
self.exports[addr] = exp.name
else:
self.names[addr] = expordinal
self.exports[addr] = "#" + str(expordinal)
except:
pass
if self.codeanalysis:
if self.processor == "intel":
self.findFunctions(self.processor)
if not imps or len(self.functions) <= 1 and self.deepcodeanalysis:
self.createIntelFunctionsByPrologs()
def loadPE(self):
try:
if self.physical:
self.pe = pefile.PE(self.filename)
else:
self.f.seek(0)
buf = self.f.read()
self.pe = pefile.PE(data=buf)
self.seek(0)
self.format = "PE"
self.log("PE Information")
self.log()
self.virtual = True
if self.pe.FILE_HEADER.Machine == 0x14C: # IMAGE_FILE_MACHINE_I386
self.processor="intel"
self.type = 32
elif self.pe.FILE_HEADER.Machine == 0x8664: # IMAGE_FILE_MACHINE_AMD64
self.processor="intel"
self.type = 64
self.log("64 Bits binary")
self.log("Sections:")
for section in self.pe.sections:
self.log(" ", section.Name, hex(section.VirtualAddress), hex(section.Misc_VirtualSize), section.SizeOfRawData)
self.log()
x = self.pe.OPTIONAL_HEADER.AddressOfEntryPoint
for s in self.pe.sections:
if x >= s.VirtualAddress and x <= s.VirtualAddress + s.SizeOfRawData:
break
x = x - s.VirtualAddress
x += s.PointerToRawData
ep = x
self.log("Entry Point at 0x%x" % x)
try:
self.log("Virtual Address is 0x%0x" % (self.pe.OPTIONAL_HEADER.ImageBase + self.pe.get_rva_from_offset(x)))
self.offset = x
self.ep = x
except:
self.log(sys.exc_info()[1])
if self.database is None:
self.loadPeFunctions(self.pe)
self.log()
except:
if self.batch:
raise
self.log("PEFILE:", sys.exc_info()[1])
raise
def loadPlugins(self):
path = PLUGINS_PATH
sys.path.append(path)
for f in os.listdir(path):
if f.startswith("_") or f.startswith(".") or not f.endswith(".py"):
continue
f = f.rstrip(".py")
try:
m = __import__(f)
if not "functions" in dir(m):
continue
if self.plugins == {}:
self.plugins = m.functions
else:
self.plugins.update(m.functions)
except:
if self.debug:
raise
def seek(self, pos):
if pos > self.maxsize:
self.log("End of file reached")
self.offset = self.maxsize
elif pos < 0:
self.log("Begin of file reached")
self.offset = 0
else:
self.offset = pos
self.f.seek(self.offset)
self.buf = self.f.read(self.bsize)
def hexdump(self, src=None, length=8, baseoffset=0, bsize=512):
""" Show hexadecimal dump for the the given buffer """
if not src:
src = self.buf[:bsize]
N=0; result=''
while src:
s,src = src[:length],src[length:]
hexa = ' '.join(["%02X"%ord(x) for x in s])
s = s.translate(FILTER)
result += "%04X %-*s %s\n" % (N+baseoffset, length*3, hexa, s)
N+=length
if N>=bsize:
break
return result
def belongToSection(self, x):
if self.format == "PE":
for s in self.pe.sections:
if x >= s.VirtualAddress and x <= s.VirtualAddress + s.SizeOfRawData:
return s
return None
def getDisassembleObject(self, obj, idx=0):
if type(obj) is tuple:
ret = CDisObj()
ret.offset = obj[0]
ret.size = obj[1]
ret.mnemonic = "".join(obj[2])
ret.mnemonic = ret.mnemonic.split(" ")[0]
data = obj[2].split(" ")
if len(data) > 1:
operands = ""
for x in data[1:]:
operands += x + " "
else:
operands = ""
ret.operands = operands
ret.instructionHex = obj[3]
return ret
else:
ret = CDisObj()
ret.offset = obj.offset
ret.size = obj.size
ret.mnemonic = obj.mnemonic
ret.operands = obj.operands
ret.instructionHex = obj.instructionHex
return ret
#return obj
def disasm(self, offset=0, processor="intel", mtype=32, lines=1, bsize=512):
if processor == "intel":
if mtype == 32:
decode = Decode32Bits
elif mtype == 16:
decode = Decode16Bits
elif mtype == 64:
decode = Decode64Bits
else:
raise EUnknownDisassemblyType()
ret = []
self.calls = []
i = None
ilines = 0
try:
buf = self.getBytes(offset, bsize)
except OverflowError:
# OverflowError: long int too large to convert to int
return []
for i in Decode(offset, buf, decode):
i = self.getDisassembleObject(i, ilines)
ret.append(i)
ilines += 1
if ilines == lines:
break
return ret
def disassemble(self, buf, processor="intel", type=32, lines=40, bsize=512, baseoffset=0):
""" Disassemble a given buffer using Distorm """
if processor == "intel":
if type == 32:
decode = Decode32Bits
elif type == 16:
decode = Decode16Bits
elif type == 64:
decode = Decode64Bits
else:
raise EUnknownDisassemblyType()
pos = 0
ret = ""
index = 0
self.calls = []
offset = 0
i = None
for i in Decode(baseoffset, buf, decode):
i = self.getDisassembleObject(i)
pos += 1
ops = str(i.operands)
comment = ""
func = ""
if str(i.mnemonic).lower().startswith("call") or \
str(i.mnemonic).lower().startswith("j") or \
str(i.mnemonic).lower().startswith("loop"):
try:
if str(i.operands).startswith("["):
ops = str(i.operands).replace("[", "").replace("]", "")
else:
ops = str(i.operands)
ops = int(ops, 16)
if self.names.has_key(ops):
func = self.names[ops]
if self.maxsize >= ops and ops > 0:
index += 1
comment = "\t; %d %s" % (index, func)
self.calls.append(ops)
ops = "0x%08x" % ops
else:
#comment = "\t; %s" % func
if func != "":
ops = func
else:
ops = "0x%08x" % ops
comment = ""
except:
ops = str(i.operands)
elif str(i.operands).find("[") > -1:
tmp = re.findall("\[(0x[0-9A-F]+)\]", str(i.operands), re.IGNORECASE)
if len(tmp) > 0:
tmp = int(tmp[0], 16)
if self.names.has_key(tmp):
if self.imports.has_key(tmp):
comment = "\t; %s" % self.names[tmp]
else:
index += 1
comment = "\t; %d %s" % (index, self.names[tmp])
else:
if self.names.has_key(i.offset):
mxrefs = []
if self.xrefs_to.has_key(i.offset):
tmpidx = 0
for tmp in self.xrefs_to[i.offset]:
tmpidx += 1
if self.names.has_key(tmp):
mxrefs.append(self.names[tmp])
else:
mxrefs.append("sub_%08x" % tmp)
if tmpidx == 3:
mxrefs.append("...")
break
pos += 1
if len(mxrefs) > 0:
ret += "0x%08x ; FUNCTION %s\t XREFS %s\n" % (i.offset, self.names[i.offset], ", ".join(mxrefs))
else:
ret += "0x%08x ; FUNCTION %s\n" % (i.offset, self.names[i.offset])
#comment = "\t; Function %s" % self.names[i.offset]
else:
comment = ""
if self.case == 'high':
ret += "0x%08x (%02x) %-20s %s%s\n" % (i.offset, i.size, i.instructionHex, str(i.mnemonic) + " " + str(ops), comment)
# if pyew.case is 'low' or wrong
else:
ret += "0x%08x (%02x) %-20s %s%s\n" % (i.offset, i.size, i.instructionHex, str(i.mnemonic).lower() + " " + str(ops).lower(), comment)
if str(i.mnemonic).lower().startswith("j") or \
str(i.mnemonic).lower() == "ret" or \
str(i.mnemonic).lower().find("loop") > -1:
pos += 1
ret += "0x%08x " % i.offset + "-"*70 + "\n"
if pos >= lines:
break
if i:
self.lastasmoffset = i.offset + i.size
elif processor == "python":
moffset = self.offset
self.seek(0)
buf = self.f.read()
self.log(dis.dis(buf))
self.seek(moffset)
ret = ""
return ret
def strings(self, buf, doprint=True, offset=0):
strs = CStrings(buf)
ret = strs.getStrings()
hints = []
for x in ret:
pos = buf.find(x)
hints.append({pos+offset:x})
if doprint:
self.log("HINT[0x%08x]: %s" % (pos, x))
return hints
def extract(self, buf, strre, doprint=True, offset=0):
obj = re.compile(strre, re.IGNORECASE | re.MULTILINE)
ret = obj.findall(buf)
hints = []
for x in ret:
pos = buf.find(x)
hints.append({pos+offset:x})
if doprint:
self.log("HINT[0x%08x]: %s" % (pos, x))
return hints
def extractoffsetstring(self, buf, doprint=True, offset=0):
strs = COffsetString()
strs.minsize = self.minoffsetsize
strs.offset = self.deltaoffset
strs.buf = buf
l = strs.findall()
if doprint:
for x in l:
pos = x[1]+offset
val = x[0]
self.log("HINT[0x%08x]: %s" % (pos, val))
return l
def dosearch(self, f, mtype, search, cols=32, doprint=True, offset=0):
if (search == None or search == "") and mtype not in ["s", "o"]:
return []
oldpos = f.tell()
f.seek(offset)
buf = f.read()
moffset = 0
hints = []
if mtype == "s" and search=="":
hints = self.strings(buf, doprint, offset=offset)
elif mtype == "u" and search == "":
hints = self.strings(buf, doprint, offset=offset)
elif mtype == "r":
hints = self.extract(buf, strre=search, doprint=doprint, offset=offset)
elif mtype == "o":
hints = self.extractoffsetstring(buf, doprint=doprint, offset=offset)
else:
try:
self.calls = []
while 1:
if mtype == "s":
pos = buf.find(search)
elif mtype == "i":
pos = buf.lower().find(search.lower())
elif mtype == "x":
pos = buf.find(unhexlify(search))
elif mtype == "X":
pos = buf.lower().find(unhexlify(search).lower())
elif mtype == "u":
pos = buf.find(to_unicode(search))
elif mtype == "U":
pos = buf.lower().find(to_unicode(search.lower()))
else:
self.log("Unknown search type!")
break
if pos > -1:
if doprint:
s = buf[pos:pos+cols]
s = s.translate(FILTER)
tmp = moffset+pos+offset
self.calls.append(tmp)
self.log("HINT[0x%08x]: %s" % (tmp, s))
hints.append({moffset+pos+offset:buf[pos:pos+cols]})
moffset += pos + len(search)
buf = buf[pos+len(search):]
if buf == "":
break
else:
break
except KeyboardInterrupt:
self.log("Aborted")
except:
self.log("Error:", sys.exc_info()[1])
raise
f.seek(oldpos)
return hints
def getBuffer(self):
moffset = self.offset
self.f.seek(0)
buf = self.f.read()
self.seek(moffset)
return buf
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