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zip.py
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zip.py
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################################################################################
#
# Copyright 2014-2016 Eric Lacombe <eric.lacombe@security-labs.org>
#
################################################################################
#
# This file is part of fuddly.
#
# fuddly 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 3 of the License, or
# (at your option) any later version.
#
# fuddly 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 fuddly. If not, see <http://www.gnu.org/licenses/>
#
################################################################################
import zlib
from framework.data_model import *
from framework.global_resources import *
from framework.value_types import *
class ZIP_DataModel(DataModel):
file_extension = 'zip'
name = 'zip'
def build_data_model(self):
MIN_FILE = 1
MAX_FILE = -1
zip_desc = \
{'name': 'ZIP',
'contents': [
{'name': 'start_padding',
'contents': String(size=0),
'qty': (0, 1),
'clear_attrs': MH.Attr.Mutable,
'alt': [
{'conf': 'ABS',
'contents': String(size=0),
'set_attrs': MH.Attr.Abs_Postpone,
'clear_attrs': MH.Attr.Mutable,
'absorb_csts': AbsNoCsts()}
]},
{'name': 'file_list',
'contents': [
{'name': 'file',
'qty': (MIN_FILE,MAX_FILE),
'contents': [
{'name': 'header',
'contents': [
{'name': 'sig',
'contents': UINT32_le(values=[0x04034b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'common_attrs',
'contents': [
{'name': 'version_needed',
'contents': UINT16_le()},
{'name': 'gp_bit_flag',
'contents': BitField(subfield_sizes=[2,1,13], endian=VT.LittleEndian,
subfield_values=[None, [0,1], None],
subfield_val_extremums=[[0,3], None, [0, 8191]])},
{'name': 'compression_method',
'contents': UINT16_le()},
{'name': 'last_mod_time',
'contents': UINT16_le()},
{'name': 'last_mod_date',
'contents': UINT16_le()},
{'name': 'crc32',
'contents': CRC(vt=UINT32_le, clear_attrs=[MH.Attr.Mutable]),
'node_args': 'data',
# 'clear_attrs': [MH.Attr.Freezable],
'alt': [
{'conf': 'ABS',
'contents': UINT32_le(max=2**10)}
]},
{'name': 'compressed_size',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
UINT32_le(values=[len(x.to_bytes())])),
'node_args': 'data',
'alt': [
{'conf': 'ABS',
'contents': UINT32_le(max=2**10)}
]},
{'name': 'uncompressed_size',
'contents': UINT32_le(max=2**10)}
]},
{'name': 'file_name_length',
'contents': UINT16_le(max=2**10)},
{'name': 'extra_field_length',
'contents': UINT16_le(max=2**10)},
{'name': 'file_name',
'type': MH.Generator,
'clear_attrs': [MH.Attr.Freezable],
'contents': lambda x: Node('cts', value_type=\
Filename(size=x.get_raw_value(), alphabet='ABC')),
'node_args': 'file_name_length'},
{'name': 'extra_field',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
String(size=x.get_raw_value())),
'node_args': 'extra_field_length'}
]},
{'name': 'data',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
String(values=[zlib.compress(b'a'*x.get_raw_value())])),
'node_args': 'uncompressed_size',
'alt': [
{'conf': 'ABS',
'type': MH.Generator,
'custo_clear': MH.Custo.Gen.ResetOnUnfreeze,
'contents': lambda x: Node('cts', value_type=\
String(size=x.get_raw_value())),
'node_args': 'compressed_size'}
]},
{'name': 'data_desc',
'exists_if': (BitFieldCondition(sf=1, val=1), 'gp_bit_flag'), # check 3rd bit of gp_flag
'contents': [
{'name': ('crc32', 2),
'clone': 'crc32'},
{'name': ('compressed_size', 2),
'clone': 'compressed_size'},
{'name': ('uncompressed_size', 2),
'clone': 'uncompressed_size'}
]},
{'name': 'no_data_desc',
'exists_if': (BitFieldCondition(sf=1, val=0), 'gp_bit_flag'),
'contents': String(size=0)}
]}
]},
{'name': 'archive_desc_header',
'qty': (0,1),
'contents': String(size=0),
'alt': [
{'conf': 'ABS',
'contents': [
{'name': 'archive_extra_data_sig',
'contents': UINT32_le(values=[0x08064b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'extra_enc_field_len',
'contents': UINT32_le(max=2**5)},
{'name': 'extra_enc_field',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
String(size=x.get_raw_value())),
'node_args': 'extra_enc_field_len'}
]}
]},
{'name': 'cdir',
'contents': [
{'name': 'cdir_hdr',
'qty': (MIN_FILE,MAX_FILE),
'sync_qty_with': 'file',
'contents': [
{'name': 'unsupported_fields',
'contents': String(size=0),
'alt': [
{'conf': 'ABS',
'contents': String(size=10),
'set_attrs': [MH.Attr.Abs_Postpone],
'absorb_csts': AbsNoCsts()}
]},
{'name': ('sig', 2),
'contents': UINT32_le(values=[0x02014b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'version_made_by',
'contents': UINT16_le()},
{'name': ('common_attrs', 2),
'contents': COPY_VALUE(path='header/common_attrs$', depth=1),
'node_args': 'file_list',
'clear_attrs': [MH.Attr.Mutable]},
{'name': ('file_name_length', 2),
'contents': COPY_VALUE(path='header/file_name_length', depth=1),
'node_args': 'file_list'},
{'name': ('extra_field_length', 2),
'contents': COPY_VALUE(path='header/extra_field_length', depth=1),
'node_args': 'file_list'},
{'name': 'file_comment_length',
'contents': UINT16_le(max=2**10)},
{'name': 'disk_number_start',
'contents': UINT16_le()},
{'name': 'internal_file_attr',
'contents': UINT16_le()},
{'name': 'external_file_attr',
'contents': UINT32_le()},
{'name': 'file_hdr_off',
'fuzz_weight': 10,
# 'custo_set': MH.Custo.Gen.ResetOnUnfreeze,
'contents': OFFSET(vt=UINT32_le),
'node_args': ['start_padding', 'file_list']},
{'name': ('file_name', 2),
'contents': COPY_VALUE(path='header/file_name/cts$', depth=1),
'node_args': 'file_list',
'alt': [
{'conf': 'ABS',
'contents': lambda x: Node('cts', value_type=\
String(size=x.cc.generated_node.get_raw_value())),
'node_args': ('file_name_length', 2)} ]},
{'name': ('extra_field', 2),
'contents': COPY_VALUE(path='header/extra_field/cts$', depth=1),
'node_args': 'file_list',
'alt': [
{'conf': 'ABS',
'contents': lambda x: Node('cts', value_type=\
String(size=x.cc.generated_node.get_raw_value())),
'node_args': ('extra_field_length', 2)} ]},
{'name': 'file_comment',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
String(size=x.get_raw_value())),
'node_args': 'file_comment_length'}
]}
]},
{'name': 'ZIP64_specifics',
'contents': [
{'weight': 5,
'contents': [
{'name': 'empty',
'contents': String(size=0)},
]},
{'weight': 1,
'contents': [
{'name': 'full',
'contents': String(values=['PK\x06\x06'+'A'*20+'PK\x06\x07'+'B'*16])},
]},
],
'alt': [
{'conf': 'ABS',
'contents': [
{'section_type': MH.Pick,
'duplicate_mode': MH.Copy,
'contents': [
{'name': 'end_of_cdir',
'contents': [
{'name': 'zip64_sig_record',
'contents': UINT32_le(values=[0x06064b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'record_meta_data',
'contents': String(size=0),
'set_attrs': [MH.Attr.Abs_Postpone],
'absorb_csts': AbsNoCsts()},
{'name': 'zip64_sig_locator',
'contents': UINT32_le(values=[0x07064b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'locator_meta_data',
'contents': String(size=16)}
]},
{'name': 'empty_end_of_cdir',
'contents': String(size=0)}
]}
]}
]},
{'name': 'end_central_dir',
'exists_if_not': 'ZIP64_specifics',
'contents': [
{'name': ('ecd_sig', 3),
'contents': UINT32_le(values=[0x06054b50]),
'absorb_csts': AbsFullCsts(),
'clear_attrs': [MH.Attr.Mutable]},
{'name': 'disk_number',
'contents': UINT16_le()},
{'name': 'disk_number_with_cdir_start',
'contents': UINT16_le()},
{'name': 'total_nb_of_cdir_entries_in_this_disk',
'contents': lambda x: Node('cts', value_type=\
UINT16_le(values=[x.get_subnode_qty()])),
'node_args': 'cdir'},
{'name': 'total_nb_of_cdir_entries',
'clone': 'total_nb_of_cdir_entries_in_this_disk'},
{'name': 'size_of_cdir',
'contents': UINT32_le()},
{'name': 'off_of_cdir',
'type': MH.Generator,
'contents': lambda x: Node('cts', value_type=\
UINT32_le(values=[len(x[0].to_bytes()) \
+ len(x[1].to_bytes()) #])),
+ len(x[2].to_bytes())])),
'node_args': ['start_padding', 'file_list', 'archive_desc_header']},
{'name': 'optional',
'qty': (0,1),
'contents': [
{'name': 'ZIP_comment_len',
'contents': UINT32_le(max=2**10)},
{'name': 'ZIP_comment',
'contents': lambda x: Node('cts', value_type=\
String(size=x.get_raw_value())),
'node_args': 'ZIP_comment_len'}
]}
]},
{'name': 'end_padding',
'contents': String(size=0),
'qty': (0,1),
'alt': [
{'conf': 'ABS',
'contents': String(size=0),
'absorb_csts': AbsNoCsts()}
]}
]}
mb = NodeBuilder(delayed_jobs=True)
pkzip = mb.create_graph_from_desc(zip_desc)
self.register(pkzip)
pkzip_abs = pkzip.get_clone(new_env=True)
pkzip_abs.set_current_conf('ABS', recursive=True)
self.register_atom_for_decoding(pkzip_abs,
absorb_constraints=AbsNoCsts(size=True, struct=True))
data_model = ZIP_DataModel()