-
Notifications
You must be signed in to change notification settings - Fork 8
/
Copy pathbinaryview.py
173 lines (147 loc) · 6.41 KB
/
binaryview.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
"""BinaryView class for Binary Ninja plugin."""
import base64
import dataclasses
import json
from typing import Any, Set
from binaryninja.binaryview import BinaryView # type: ignore
from binaryninja.enums import ( # type: ignore
Endianness,
SectionSemantics,
SegmentFlag,
SymbolType,
)
from binaryninja.log import log_debug, log_error, log_warn # type: ignore
from binaryninja.platform import Platform # type: ignore
from binaryninja.plugin import BackgroundTaskThread # type: ignore
from binaryninja.types import Symbol # type: ignore
from .android.dex import AccessFlag, DexFile, parse_uint
class DataclassJSONEncoder(json.JSONEncoder):
def default(self, o: object) -> Any:
if isinstance(o, bytes):
return base64.b64encode(o).decode()
if dataclasses.is_dataclass(o):
return dataclasses.asdict(o)
if isinstance(o, AccessFlag):
return o.value
return super().default(o)
class JsonWriter(BackgroundTaskThread): # type: ignore
def __init__(self, obj: Any, fn: str) -> None:
BackgroundTaskThread.__init__(self, "Writing Dex structure as JSON")
self.obj = obj
self.fn = fn
def run(self) -> None:
with open(self.fn, "w") as f:
json.dump(self.obj.__dict__, f, cls=DataclassJSONEncoder)
class DexParser(BackgroundTaskThread): # type: ignore
progress_title = "Parsing Dex"
def __init__(self, bv: BinaryView) -> None:
BackgroundTaskThread.__init__(self, self.progress_title)
self.bv = bv
def run(self) -> None:
try:
df = DexFile(self.bv.raw.read(0, self.bv.raw.end))
if not hasattr(self.bv.arch, "dfs"):
self.bv.arch.dfs = dict()
self.bv.arch.dfs[self.bv.file.filename.rsplit("/", 1)[-1]] = df
except Exception:
log_error("caught error, writing json anyway")
raise
finally:
pass
# TODO add gui button to do this
# TODO make this depend on filename
# background_task = JsonWriter(df, "/tmp/out.json")
# background_task.start()
# Process classes and code blocks
# For each code block, add
# - binja section
# - binja function
# - binja symbol
# - comments for tries and catches
# TODO figure out where to put static field initializations
self.progress = self.progress_title + ": processing code blocks"
defined_functions: Set[str] = set()
for class_def in df.class_defs:
if not class_def.class_data:
continue
for method in (
class_def.class_data.direct_methods
+ class_def.class_data.virtual_methods
):
if method.code:
off = method.code._insns_off
# Add section
self.bv.add_auto_section(
f"code_{hex(off)}",
method.code._insns_off,
2 * method.code.insns_size,
SectionSemantics.ReadOnlyCodeSectionSemantics,
)
# Add function and symbol
function_name = f"{method.access_flags}{method.method.class_}->{method.method.name}("
for param in method.method.proto.parameters:
function_name += param
function_name += ")" + method.method.proto.return_type
if function_name in defined_functions:
log_error(f"Duplicate function name {function_name}")
defined_functions.add(function_name)
self.bv.define_auto_symbol(
Symbol(SymbolType.FunctionSymbol, off, function_name)
)
self.bv.add_function(off)
# Add tries and catches as comments
if method.code.tries_size:
for try_item in method.code.tries:
self.bv.set_comment_at(
off + try_item.start_addr * 2,
f":try_start_{try_item.start_addr:x}",
)
self.bv.set_comment_at(
off + try_item.start_addr * 2 + try_item.insn_count * 2,
f":try_end_{try_item.start_addr+try_item.insn_count:x}",
)
self.bv.set_comment_at(
off + try_item.start_addr * 2 + try_item.insn_count * 2,
f"{try_item.handler}",
)
# TODO create data sections for static fields
class Dex(BinaryView): # type: ignore
name = "Dex"
DEX_FILE_MAGICS = [b"dex\n039\0", b"dex\n038\0", b"dex\n037\0", b"dex\n035\0"]
def __init__(self, data: BinaryView) -> None:
BinaryView.__init__(self, parent_view=data, file_metadata=data.file)
self.raw = data
@classmethod
def is_valid_for_data(cls, data: BinaryView) -> bool:
return data.read(0, 8) in cls.DEX_FILE_MAGICS
def init(self) -> bool:
"""Main function, calls DexParser.run()"""
self.platform = Platform["Smali"]
self.hdr = self.raw.read(0, 0x70)
endian_bytes = self.hdr[40:44]
if endian_bytes == b"\x12\x34\x56\x78":
data_size = parse_uint(Endianness.BigEndian, self.hdr[104:108])
data_off = parse_uint(Endianness.BigEndian, self.hdr[108:112])
elif endian_bytes == b"\x78\x56\x34\x12":
data_size = parse_uint(Endianness.LittleEndian, self.hdr[104:108])
data_off = parse_uint(Endianness.LittleEndian, self.hdr[108:112])
else:
raise ValueError(f"Invalid endianness found: {endian_bytes!r}")
self.add_auto_segment(
data_off,
data_size,
data_off,
data_size,
SegmentFlag.SegmentReadable
| SegmentFlag.SegmentContainsData
| SegmentFlag.SegmentContainsCode,
)
background_parser = DexParser(self)
background_parser.start()
return True
def perform_get_address_size(self):
return 2
def perform_is_executable(self) -> bool:
return True
def perform_get_default_endianness(self) -> Endianness:
return Endianness.LittleEndian