def __init__(self, raw_buff):
self.reset()
self.buff = bytecode.BuffHandle(raw_buff)
_type, _header_size, _size = unpack('<HHL', self.buff.read(8))
if _header_size == 28024:
# Can be a common error: the file is not an AXML but a plain XML
# The file will then usually start with '<?xm' / '3C 3F 78 6D'
print(
"Header size is 28024! Are you trying to parse a plain XML file?"
)
exit(1)
if _type != 0x0003:
print("header-type error")
exit(1)
# self.buff.read(4)
# self.buff.read(4)
self.sb = StringBlock(self.buff)
self.m_resourceIDs = []
self.m_prefixuri = {}
self.m_uriprefix = {}
self.m_prefixuriL = []
def __init__(self, raw_buff):
self.reset()
self.valid_axml = True
self.axml_tampered = False
self.packerwarning = False
self.buff = bytecode.BuffHandle(raw_buff)
axml_file, = unpack('<L', self.buff.read(4))
if axml_file != CHUNK_AXML_FILE:
if axml_file >> 16 == 0x0008:
self.axml_tampered = True
print "AXML file has an unusual header", format(self.buff)
else:
self.valid_axml = False
print "Not a valid AXML file. Header 0x{:08x}".format(
self.buff)
return
self.filesize, = unpack('<L', self.buff.read(4))
header = ARSCHeader(self.buff)
if header.type == 0x0001:
print "Expected String Pool header, got %x" % header.type
self.sb = StringBlock(self.buff, header)
self.m_resourceIDs = []
self.m_prefixuri = {}
self.m_uriprefix = {}
self.m_prefixuriL = []
def __init__(self, raw_buff):
self.reset()
self.buff = bytecode.BuffHandle(raw_buff)
self.buff.read(4)
self.buff.read(4)
self.sb = StringBlock(self.buff)
self.m_resourceIDs = []
self.m_prefixuri = {}
self.m_uriprefix = {}
self.m_prefixuriL = []
def __init__(self, raw_buff, debug=False):
self.log = logging.getLogger("pyaxmlparser.arscparser")
self.log.setLevel(logging.DEBUG if debug else logging.CRITICAL)
self.analyzed = False
self._resolved_strings = None
self.buff = bytecode.BuffHandle(raw_buff)
self.header = ARSCHeader(self.buff)
# TODO: assert header type
self.packageCount = unpack("<i", self.buff.read(4))[0]
self.packages = {}
self.values = {}
self.resource_values = collections.defaultdict(collections.defaultdict)
self.resource_configs = collections.defaultdict(
lambda: collections.defaultdict(set))
self.resource_keys = collections.defaultdict(
lambda: collections.defaultdict(collections.defaultdict))
self.string_pool_main = None
# skip to the start of the first chunk data, skipping trailing header bytes
self.buff.set_idx(self.header.start + self.header.header_size)
# Gives the offset inside the file of the end of this chunk
data_end = self.header.start + self.header.size
while self.buff.get_idx() <= data_end - ARSCHeader.SIZE:
res_header = ARSCHeader(self.buff)
if res_header.start + res_header.size > data_end:
# this inner chunk crosses the boundary of the table chunk
break
if (res_header.type == const.RES_STRING_POOL_TYPE
and not self.string_pool_main):
self.string_pool_main = StringBlock(self.buff, res_header)
elif res_header.type == const.RES_TABLE_PACKAGE_TYPE:
assert (len(self.packages) <
self.packageCount), "Got more packages than expected"
current_package = ARSCResTablePackage(self.buff, res_header)
package_name = current_package.get_name()
package_data_end = res_header.start + res_header.size
self.packages[package_name] = []
# After the Header, we have the resource type symbol table
self.buff.set_idx(current_package.header.start +
current_package.typeStrings)
type_sp_header = ARSCHeader(self.buff)
assert type_sp_header.type == const.RES_STRING_POOL_TYPE, (
"Expected String Pool header, got %x" %
type_sp_header.type)
table_strings = StringBlock(self.buff, type_sp_header)
# Next, we should have the resource key symbol table
self.buff.set_idx(current_package.header.start +
current_package.keyStrings)
key_sp_header = ARSCHeader(self.buff)
assert key_sp_header.type == const.RES_STRING_POOL_TYPE, (
"Expected String Pool header, got %x" % key_sp_header.type)
key_strings = StringBlock(self.buff, key_sp_header)
# Add them to the dict of read packages
self.packages[package_name].append(current_package)
self.packages[package_name].append(table_strings)
self.packages[package_name].append(key_strings)
pc = PackageContext(current_package, self.string_pool_main,
table_strings, key_strings)
# skip to the first header in this table package chunk
# FIXME is this correct? We have already read the first two sections!
# self.buff.set_idx(res_header.start + res_header.header_size)
# this looks more like we want: (???)
self.buff.set_idx(res_header.start + res_header.header_size +
type_sp_header.size + key_sp_header.size)
# Read all other headers
while self.buff.get_idx(
) <= package_data_end - ARSCHeader.SIZE:
pkg_chunk_header = ARSCHeader(self.buff)
self.log.debug(
"Found a header: {}".format(pkg_chunk_header))
if (pkg_chunk_header.start + pkg_chunk_header.size >
package_data_end):
# we are way off the package chunk; bail out
break
self.packages[package_name].append(pkg_chunk_header)
if pkg_chunk_header.type == const.RES_TABLE_TYPE_SPEC_TYPE:
self.packages[package_name].append(
ARSCResTypeSpec(self.buff, pc))
elif pkg_chunk_header.type == const.RES_TABLE_TYPE_TYPE:
a_res_type = ARSCResType(self.buff, pc)
self.packages[package_name].append(a_res_type)
self.resource_configs[package_name][a_res_type].add(
a_res_type.config)
self.log.debug("Config: {}".format(a_res_type.config))
entries = []
for i in range(0, a_res_type.entryCount):
current_package.resource_id = (
current_package.resource_id & 0xFFFF0000 | i)
entries.append((
unpack("<i", self.buff.read(4))[0],
current_package.resource_id,
))
self.packages[package_name].append(entries)
for entry, res_id in entries:
if self.buff.end():
break
if entry != -1:
ate = ARSCResTableEntry(self.buff, res_id, pc)
self.packages[package_name].append(ate)
if ate.is_weak():
# FIXME we are not sure how to implement the FLAG_WEAk!
# We saw the following: There is just a single Res_value after the ARSCResTableEntry
# and then comes the next ARSCHeader.
# Therefore we think this means all entries are somehow replicated?
# So we do some kind of hack here. We set the idx to the entry again...
# Now we will read all entries!
# Not sure if this is a good solution though
self.buff.set_idx(ate.start)
elif pkg_chunk_header.type == const.RES_TABLE_LIBRARY_TYPE:
self.log.warning(
"RES_TABLE_LIBRARY_TYPE chunk is not supported")
else:
# FIXME: silently skip other chunk types
pass
# skip to the next chunk
self.buff.set_idx(pkg_chunk_header.start +
pkg_chunk_header.size)
# move to the next resource chunk
self.buff.set_idx(res_header.start + res_header.size)
def __init__(self, raw_buff, debug=False):
self.log = logging.getLogger("pyaxmlparser.axmlparser")
self.log.setLevel(logging.DEBUG if debug else logging.CRITICAL)
self._reset()
self._valid = True
self.axml_tampered = False
self.buff = bytecode.BuffHandle(raw_buff)
# Minimum is a single ARSCHeader, which would be a strange edge case...
if self.buff.size() < 8:
self.log.error(
"Filesize is too small to be a valid AXML file! Filesize: {}".
format(self.buff.size()))
self._valid = False
return
# This would be even stranger, if an AXML file is larger than 4GB...
# But this is not possible as the maximum chunk size is a unsigned 4 byte int.
if self.buff.size() > 0xFFFFFFFF:
self.log.error(
"Filesize is too large to be a valid AXML file! Filesize: {}".
format(self.buff.size()))
self._valid = False
return
try:
axml_header = ARSCHeader(self.buff)
except AssertionError as e:
self.log.error("Error parsing first resource header: %s", e)
self._valid = False
return
self.filesize = axml_header.size
if axml_header.header_size == 28024:
# Can be a common error: the file is not an AXML but a plain XML
# The file will then usually start with '<?xm' / '3C 3F 78 6D'
self.log.warning(
"Header size is 28024! Are you trying to parse a plain XML file?"
)
if axml_header.header_size != 8:
self.log.error(
"This does not look like an AXML file. "
"header size does not equal 8! header size = {}".format(
axml_header.header_size))
self._valid = False
return
if self.filesize > self.buff.size():
self.log.error(
"This does not look like an AXML file. "
"Declared filesize does not match real size: {} vs {}".format(
self.filesize, self.buff.size()))
self._valid = False
return
if self.filesize < self.buff.size():
# The file can still be parsed up to the point where the chunk should end.
self.axml_tampered = True
self.log.warning(
"Declared filesize ({}) is smaller than total file size ({}). "
"Was something appended to the file? Trying to parse it anyways."
.format(self.filesize, self.buff.size()))
# Not that severe of an error, we have plenty files where this is not
# set correctly
if axml_header.type != const.RES_XML_TYPE:
self.axml_tampered = True
self.log.warning(
"AXML file has an unusual resource type! "
"Malware likes to to such stuff to anti androguard! "
"But we try to parse it anyways. "
"Resource Type: 0x{:04x}".format(axml_header.type))
# Now we parse the STRING POOL
try:
header = ARSCHeader(self.buff)
except AssertionError as e:
self.log.error("Error parsing resource header of string pool: %s",
e)
self._valid = False
return
if header.header_size != 0x1C:
self.log.error(
"This does not look like an AXML file. String chunk header "
"size does not equal 28! header size = {}".format(
header.header_size))
self._valid = False
return
if header.type != const.RES_STRING_POOL_TYPE:
self.log.error(
"Expected String Pool header, got resource type 0x{:04x} "
"instead".format(header.type))
self._valid = False
return
self.sb = StringBlock(self.buff, header)
# Stores resource ID mappings, if any
self.resource_ids = []
# Store a list of prefix/uri mappings encountered
self.namespaces = []
def __init__(self, raw_buff):
self.analyzed = False
self._resolved_strings = None
self.buff = bytecode.BuffHandle(raw_buff)
self.header = ARSCHeader(self.buff)
self.packageCount = unpack('<i', self.buff.read(4))[0]
self.packages = {}
self.values = {}
self.resource_values = collections.defaultdict(collections.defaultdict)
self.resource_configs = collections.defaultdict(
lambda: collections.defaultdict(set))
self.resource_keys = collections.defaultdict(
lambda: collections.defaultdict(collections.defaultdict))
self.stringpool_main = None
self.buff.set_idx(self.header.start + self.header.header_size)
data_end = self.header.start + self.header.size
while self.buff.get_idx() <= data_end - ARSCHeader.SIZE:
res_header = ARSCHeader(self.buff)
if res_header.start + res_header.size > data_end:
# this inner chunk crosses the boundary of the table chunk
break
if res_header.type == 0x0001 and not self.stringpool_main:
self.stringpool_main = StringBlock(self.buff, res_header)
elif res_header.type == 0x0200:
print len(
self.packages
) < self.packageCount, "Got more packages than expected"
current_package = ARSCResTablePackage(self.buff, res_header)
package_name = current_package.get_name()
package_data_end = res_header.start + res_header.size
self.packages[package_name] = []
self.buff.set_idx(current_package.header.start +
current_package.typeStrings)
type_sp_header = ARSCHeader(self.buff)
assert type_sp_header.type == 0x0001, \
"Expected String Pool header, got %x" % type_sp_header.type
mTableStrings = StringBlock(self.buff, type_sp_header)
self.buff.set_idx(current_package.header.start +
current_package.keyStrings)
key_sp_header = ARSCHeader(self.buff)
assert key_sp_header.type == 0x0001, \
"Expected String Pool header, got %x" % key_sp_header.type
mKeyStrings = StringBlock(self.buff, key_sp_header)
self.packages[package_name].append(current_package)
self.packages[package_name].append(mTableStrings)
self.packages[package_name].append(mKeyStrings)
pc = PackageContext(current_package, self.stringpool_main,
mTableStrings, mKeyStrings)
# skip to the first header in this table package chunk
self.buff.set_idx(res_header.start + res_header.header_size)
while self.buff.get_idx(
) <= package_data_end - ARSCHeader.SIZE:
pkg_chunk_header = ARSCHeader(self.buff)
if pkg_chunk_header.start + pkg_chunk_header.size > package_data_end:
# we are way off the package chunk; bail out
break
self.packages[package_name].append(pkg_chunk_header)
if pkg_chunk_header.type == RES_TABLE_TYPE_SPEC_TYPE:
self.packages[package_name].append(
ARSCResTypeSpec(self.buff, pc))
elif pkg_chunk_header.type == RES_TABLE_TYPE_TYPE:
a_res_type = ARSCResType(self.buff, pc)
self.packages[package_name].append(a_res_type)
self.resource_configs[package_name][a_res_type].add(
a_res_type.config)
entries = []
for i in range(0, a_res_type.entryCount):
current_package.mResId = current_package.mResId & 0xffff0000 | i
entries.append((unpack('<i', self.buff.read(4))[0],
current_package.mResId))
self.packages[package_name].append(entries)
for entry, res_id in entries:
if self.buff.end():
break
if entry != -1:
ate = ARSCResTableEntry(self.buff, res_id, pc)
self.packages[package_name].append(ate)
elif pkg_chunk_header.type == RES_TABLE_LIBRARY_TYPE:
print "RES_TABLE_LIBRARY_TYPE chunk is not supported"
else:
# silently skip other chunk types
pass
# skip to the next chunk
self.buff.set_idx(pkg_chunk_header.start +
pkg_chunk_header.size)
# move to the next resource chunk
self.buff.set_idx(res_header.start + res_header.size)
