contrib/devtools/symbol-check.py
#!/usr/bin/env python3
# Copyright (c) 2014 Wladimir J. van der Laan
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
'''
A script to check that release executables only contain certain symbols
and are only linked against allowed libraries.
Example usage:
find ../path/to/binaries -type f -executable | xargs python3 contrib/devtools/symbol-check.py
'''
import sys
import lief
# Debian 10 (Buster) EOL: 2024. https://wiki.debian.org/LTS
#
# - libgcc version 8.3.0 (https://packages.debian.org/search?suite=buster&arch=any&searchon=names&keywords=libgcc1)
# - libc version 2.28 (https://packages.debian.org/search?suite=buster&arch=any&searchon=names&keywords=libc6)
#
# Ubuntu 18.04 (Bionic) EOL: 2028. https://wiki.ubuntu.com/ReleaseTeam
#
# - libgcc version 8.4.0 (https://packages.ubuntu.com/bionic/libgcc1)
# - libc version 2.27 (https://packages.ubuntu.com/bionic/libc6)
#
# CentOS Stream 8 EOL: 2024. https://wiki.centos.org/About/Product
#
# - libgcc version 8.5.0 (http://mirror.centos.org/centos/8-stream/AppStream/x86_64/os/Packages/)
# - libc version 2.28 (http://mirror.centos.org/centos/8-stream/AppStream/x86_64/os/Packages/)
#
# See https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html for more info.
MAX_VERSIONS = {
'GCC': (4,3,0),
'GLIBC': {
lief.ELF.ARCH.x86_64: (2,27),
lief.ELF.ARCH.ARM: (2,27),
lief.ELF.ARCH.AARCH64:(2,27),
lief.ELF.ARCH.PPC64: (2,27),
lief.ELF.ARCH.RISCV: (2,27),
},
'LIBATOMIC': (1,0),
'V': (0,5,0), # xkb (bitcoin-qt only)
}
# Ignore symbols that are exported as part of every executable
IGNORE_EXPORTS = {
'environ', '_environ', '__environ', '_fini', '_init', 'stdin',
'stdout', 'stderr',
}
# Expected linker-loader names can be found here:
# https://sourceware.org/glibc/wiki/ABIList?action=recall&rev=16
ELF_INTERPRETER_NAMES: dict[lief.ELF.ARCH, dict[lief.ENDIANNESS, str]] = {
lief.ELF.ARCH.x86_64: {
lief.ENDIANNESS.LITTLE: "/lib64/ld-linux-x86-64.so.2",
},
lief.ELF.ARCH.ARM: {
lief.ENDIANNESS.LITTLE: "/lib/ld-linux-armhf.so.3",
},
lief.ELF.ARCH.AARCH64: {
lief.ENDIANNESS.LITTLE: "/lib/ld-linux-aarch64.so.1",
},
lief.ELF.ARCH.PPC64: {
lief.ENDIANNESS.BIG: "/lib64/ld64.so.1",
lief.ENDIANNESS.LITTLE: "/lib64/ld64.so.2",
},
lief.ELF.ARCH.RISCV: {
lief.ENDIANNESS.LITTLE: "/lib/ld-linux-riscv64-lp64d.so.1",
},
}
ELF_ABIS: dict[lief.ELF.ARCH, dict[lief.ENDIANNESS, list[int]]] = {
lief.ELF.ARCH.x86_64: {
lief.ENDIANNESS.LITTLE: [3,2,0],
},
lief.ELF.ARCH.ARM: {
lief.ENDIANNESS.LITTLE: [3,2,0],
},
lief.ELF.ARCH.AARCH64: {
lief.ENDIANNESS.LITTLE: [3,7,0],
},
lief.ELF.ARCH.PPC64: {
lief.ENDIANNESS.LITTLE: [3,10,0],
lief.ENDIANNESS.BIG: [3,2,0],
},
lief.ELF.ARCH.RISCV: {
lief.ENDIANNESS.LITTLE: [4,15,0],
},
}
# Allowed NEEDED libraries
ELF_ALLOWED_LIBRARIES = {
# bitcoind and bitcoin-qt
'libgcc_s.so.1', # GCC base support
'libc.so.6', # C library
'libpthread.so.0', # threading
'libm.so.6', # math library
'libatomic.so.1',
'ld-linux-x86-64.so.2', # 64-bit dynamic linker
'ld-linux.so.2', # 32-bit dynamic linker
'ld-linux-aarch64.so.1', # 64-bit ARM dynamic linker
'ld-linux-armhf.so.3', # 32-bit ARM dynamic linker
'ld64.so.1', # POWER64 ABIv1 dynamic linker
'ld64.so.2', # POWER64 ABIv2 dynamic linker
'ld-linux-riscv64-lp64d.so.1', # 64-bit RISC-V dynamic linker
# bitcoin-qt only
'libxcb.so.1', # part of X11
'libxkbcommon.so.0', # keyboard keymapping
'libxkbcommon-x11.so.0', # keyboard keymapping
'libfontconfig.so.1', # font support
'libfreetype.so.6', # font parsing
'libdl.so.2', # programming interface to dynamic linker
'libxcb-icccm.so.4',
'libxcb-image.so.0',
'libxcb-shm.so.0',
'libxcb-keysyms.so.1',
'libxcb-randr.so.0',
'libxcb-render-util.so.0',
'libxcb-render.so.0',
'libxcb-shape.so.0',
'libxcb-sync.so.1',
'libxcb-xfixes.so.0',
'libxcb-xinerama.so.0',
'libxcb-xkb.so.1',
}
MACHO_ALLOWED_LIBRARIES = {
# bitcoind and bitcoin-qt
'libc++.1.dylib', # C++ Standard Library
'libSystem.B.dylib', # libc, libm, libpthread, libinfo
# bitcoin-qt only
'AppKit', # user interface
'ApplicationServices', # common application tasks.
'Carbon', # deprecated c back-compat API
'ColorSync',
'CoreFoundation', # low level func, data types
'CoreGraphics', # 2D rendering
'CoreServices', # operating system services
'CoreText', # interface for laying out text and handling fonts.
'CoreVideo', # video processing
'Foundation', # base layer functionality for apps/frameworks
'ImageIO', # read and write image file formats.
'IOKit', # user-space access to hardware devices and drivers.
'IOSurface', # cross process image/drawing buffers
'libobjc.A.dylib', # Objective-C runtime library
'Metal', # 3D graphics
'Security', # access control and authentication
'QuartzCore', # animation
}
PE_ALLOWED_LIBRARIES = {
'ADVAPI32.dll', # security & registry
'IPHLPAPI.DLL', # IP helper API
'KERNEL32.dll', # win32 base APIs
'msvcrt.dll', # C standard library for MSVC
'SHELL32.dll', # shell API
'WS2_32.dll', # sockets
# bitcoin-qt only
'dwmapi.dll', # desktop window manager
'GDI32.dll', # graphics device interface
'IMM32.dll', # input method editor
'NETAPI32.dll', # network management
'ole32.dll', # component object model
'OLEAUT32.dll', # OLE Automation API
'SHLWAPI.dll', # light weight shell API
'USER32.dll', # user interface
'USERENV.dll', # user management
'UxTheme.dll', # visual style
'VERSION.dll', # version checking
'WINMM.dll', # WinMM audio API
'WTSAPI32.dll', # Remote Desktop
}
def check_version(max_versions, version, arch) -> bool:
(lib, _, ver) = version.rpartition('_')
ver = tuple([int(x) for x in ver.split('.')])
if not lib in max_versions:
return False
if isinstance(max_versions[lib], tuple):
return ver <= max_versions[lib]
else:
return ver <= max_versions[lib][arch]
def check_imported_symbols(binary) -> bool:
ok: bool = True
for symbol in binary.imported_symbols:
if not symbol.imported:
continue
version = symbol.symbol_version if symbol.has_version else None
if version:
aux_version = version.symbol_version_auxiliary.name if version.has_auxiliary_version else None
if aux_version and not check_version(MAX_VERSIONS, aux_version, binary.header.machine_type):
print(f'{filename}: symbol {symbol.name} from unsupported version {version}')
ok = False
return ok
def check_exported_symbols(binary) -> bool:
ok: bool = True
for symbol in binary.dynamic_symbols:
if not symbol.exported:
continue
name = symbol.name
if binary.header.machine_type == lief.ELF.ARCH.RISCV or name in IGNORE_EXPORTS:
continue
print(f'{binary.name}: export of symbol {name} not allowed!')
ok = False
return ok
def check_ELF_libraries(binary) -> bool:
ok: bool = True
for library in binary.libraries:
if library not in ELF_ALLOWED_LIBRARIES:
print(f'{filename}: {library} is not in ALLOWED_LIBRARIES!')
ok = False
return ok
def check_MACHO_libraries(binary) -> bool:
ok: bool = True
for dylib in binary.libraries:
split = dylib.name.split('/')
if split[-1] not in MACHO_ALLOWED_LIBRARIES:
print(f'{split[-1]} is not in ALLOWED_LIBRARIES!')
ok = False
return ok
def check_MACHO_min_os(binary) -> bool:
if binary.build_version.minos == [11,0,0]:
return True
return False
def check_MACHO_sdk(binary) -> bool:
if binary.build_version.sdk == [14, 0, 0]:
return True
return False
def check_MACHO_ld64(binary) -> bool:
if binary.build_version.tools[0].version == [17, 0, 6]:
return True
return False
def check_PE_libraries(binary) -> bool:
ok: bool = True
for dylib in binary.libraries:
if dylib not in PE_ALLOWED_LIBRARIES:
print(f'{dylib} is not in ALLOWED_LIBRARIES!')
ok = False
return ok
def check_PE_subsystem_version(binary) -> bool:
major: int = binary.optional_header.major_subsystem_version
minor: int = binary.optional_header.minor_subsystem_version
if major == 6 and minor == 1:
return True
return False
def check_ELF_interpreter(binary) -> bool:
expected_interpreter = ELF_INTERPRETER_NAMES[binary.header.machine_type][binary.abstract.header.endianness]
return binary.concrete.interpreter == expected_interpreter
def check_ELF_ABI(binary) -> bool:
expected_abi = ELF_ABIS[binary.header.machine_type][binary.abstract.header.endianness]
note = binary.concrete.get(lief.ELF.NOTE_TYPES.ABI_TAG)
assert note.details.abi == lief.ELF.NOTE_ABIS.LINUX
return note.details.version == expected_abi
CHECKS = {
lief.EXE_FORMATS.ELF: [
('IMPORTED_SYMBOLS', check_imported_symbols),
('EXPORTED_SYMBOLS', check_exported_symbols),
('LIBRARY_DEPENDENCIES', check_ELF_libraries),
('INTERPRETER_NAME', check_ELF_interpreter),
('ABI', check_ELF_ABI),
],
lief.EXE_FORMATS.MACHO: [
('DYNAMIC_LIBRARIES', check_MACHO_libraries),
('MIN_OS', check_MACHO_min_os),
('SDK', check_MACHO_sdk),
('LD64', check_MACHO_ld64),
],
lief.EXE_FORMATS.PE: [
('DYNAMIC_LIBRARIES', check_PE_libraries),
('SUBSYSTEM_VERSION', check_PE_subsystem_version),
]
}
if __name__ == '__main__':
retval: int = 0
for filename in sys.argv[1:]:
try:
binary = lief.parse(filename)
etype = binary.format
if etype == lief.EXE_FORMATS.UNKNOWN:
print(f'{filename}: unknown executable format')
retval = 1
continue
failed: list[str] = []
for (name, func) in CHECKS[etype]:
if not func(binary):
failed.append(name)
if failed:
print(f'{filename}: failed {" ".join(failed)}')
retval = 1
except IOError:
print(f'{filename}: cannot open')
retval = 1
sys.exit(retval)