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Merge #18796: scripts: security-check.py refactors
eacedfb0230978748cbcfb13817fed7e7c756ba7 scripts: add additional type annotations to security-check.py (fanquake) 83d063e9541cc9ea41ea86919eb9435c73efb14e scripts: add run_command to security-check.py (fanquake) 13f606b4f940e5820ff21ea62fc27a5a91774b05 scripts: remove NONFATAL from security-check.py (fanquake) 061acf62a15ad3dbb9f055b7c2569b9832ed623a scripts: no-longer check for 32 bit windows in security-check.py (fanquake) Pull request description: * Remove 32-bit Windows checks. * Remove NONFATAL checking. Added in #8249, however unused since #13764. * Add `run_command` to de-duplicate all of the subprocess calls. Mentioned in #18713. * Add additional type annotations. * Print stderr when there is an issue running a command. ACKs for top commit: laanwj: ACK eacedfb0230978748cbcfb13817fed7e7c756ba7 Tree-SHA512: 69a7ccfdf346ee202b3e8f940634c5daed1d2b5a5d15ac9800252866ba3284ec66e391a66a0b341f5a4e5e8482fe1b614d4671e8e766112ff059405081184a85
This commit is contained in:
Wladimir J. van der Laan
pasta
parent
f7a94b58d4
commit
33c473a8e3
@ -12,33 +12,33 @@ import subprocess
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import sys
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import os
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from typing import List, Optional
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READELF_CMD = os.getenv('READELF', '/usr/bin/readelf')
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OBJDUMP_CMD = os.getenv('OBJDUMP', '/usr/bin/objdump')
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OTOOL_CMD = os.getenv('OTOOL', '/usr/bin/otool')
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NONFATAL = {} # checks which are non-fatal for now but only generate a warning
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def check_ELF_PIE(executable):
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def run_command(command) -> str:
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p = subprocess.run(command, stdout=subprocess.PIPE, check=True, universal_newlines=True)
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return p.stdout
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def check_ELF_PIE(executable) -> bool:
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'''
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Check for position independent executable (PIE), allowing for address space randomization.
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'''
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p = subprocess.Popen([READELF_CMD, '-h', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([READELF_CMD, '-h', '-W', executable])
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ok = False
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for line in stdout.splitlines():
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line = line.split()
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if len(line)>=2 and line[0] == 'Type:' and line[1] == 'DYN':
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tokens = line.split()
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if len(line)>=2 and tokens[0] == 'Type:' and tokens[1] == 'DYN':
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ok = True
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return ok
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def get_ELF_program_headers(executable):
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'''Return type and flags for ELF program headers'''
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p = subprocess.Popen([READELF_CMD, '-l', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([READELF_CMD, '-l', '-W', executable])
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in_headers = False
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count = 0
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headers = []
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@ -62,7 +62,7 @@ def get_ELF_program_headers(executable):
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count += 1
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return headers
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def check_ELF_NX(executable):
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def check_ELF_NX(executable) -> bool:
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'''
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Check that no sections are writable and executable (including the stack)
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'''
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@ -75,7 +75,7 @@ def check_ELF_NX(executable):
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have_wx = True
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return have_gnu_stack and not have_wx
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def check_ELF_RELRO(executable):
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def check_ELF_RELRO(executable) -> bool:
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'''
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Check for read-only relocations.
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GNU_RELRO program header must exist
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@ -84,7 +84,8 @@ def check_ELF_RELRO(executable):
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have_gnu_relro = False
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for (typ, flags) in get_ELF_program_headers(executable):
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# Note: not checking flags == 'R': here as linkers set the permission differently
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# This does not affect security: the permission flags of the GNU_RELRO program header are ignored, the PT_LOAD header determines the effective permissions.
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# This does not affect security: the permission flags of the GNU_RELRO program
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# header are ignored, the PT_LOAD header determines the effective permissions.
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# However, the dynamic linker need to write to this area so these are RW.
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# Glibc itself takes care of mprotecting this area R after relocations are finished.
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# See also https://marc.info/?l=binutils&m=1498883354122353
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@ -92,93 +93,69 @@ def check_ELF_RELRO(executable):
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have_gnu_relro = True
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have_bindnow = False
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p = subprocess.Popen([READELF_CMD, '-d', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([READELF_CMD, '-d', '-W', executable])
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for line in stdout.splitlines():
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tokens = line.split()
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if len(tokens)>1 and tokens[1] == '(BIND_NOW)' or (len(tokens)>2 and tokens[1] == '(FLAGS)' and 'BIND_NOW' in tokens[2:]):
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have_bindnow = True
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return have_gnu_relro and have_bindnow
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def check_ELF_Canary(executable):
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def check_ELF_Canary(executable) -> bool:
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'''
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Check for use of stack canary
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'''
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p = subprocess.Popen([READELF_CMD, '--dyn-syms', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([READELF_CMD, '--dyn-syms', '-W', executable])
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ok = False
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for line in stdout.splitlines():
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if '__stack_chk_fail' in line:
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ok = True
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return ok
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def get_PE_dll_characteristics(executable):
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'''
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Get PE DllCharacteristics bits.
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Returns a tuple (arch,bits) where arch is 'i386:x86-64' or 'i386'
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and bits is the DllCharacteristics value.
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'''
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p = subprocess.Popen([OBJDUMP_CMD, '-x', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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arch = ''
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def get_PE_dll_characteristics(executable) -> int:
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'''Get PE DllCharacteristics bits'''
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stdout = run_command([OBJDUMP_CMD, '-x', executable])
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bits = 0
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for line in stdout.splitlines():
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tokens = line.split()
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if len(tokens)>=2 and tokens[0] == 'architecture:':
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arch = tokens[1].rstrip(',')
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if len(tokens)>=2 and tokens[0] == 'DllCharacteristics':
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bits = int(tokens[1],16)
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return (arch,bits)
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return bits
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IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA = 0x0020
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IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE = 0x0040
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IMAGE_DLL_CHARACTERISTICS_NX_COMPAT = 0x0100
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def check_PE_DYNAMIC_BASE(executable):
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def check_PE_DYNAMIC_BASE(executable) -> bool:
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'''PIE: DllCharacteristics bit 0x40 signifies dynamicbase (ASLR)'''
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(arch,bits) = get_PE_dll_characteristics(executable)
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reqbits = IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE
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return (bits & reqbits) == reqbits
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bits = get_PE_dll_characteristics(executable)
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return (bits & IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE) == IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE
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# On 64 bit, must support high-entropy 64-bit address space layout randomization in addition to DYNAMIC_BASE
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# to have secure ASLR.
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def check_PE_HIGH_ENTROPY_VA(executable):
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# Must support high-entropy 64-bit address space layout randomization
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# in addition to DYNAMIC_BASE to have secure ASLR.
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def check_PE_HIGH_ENTROPY_VA(executable) -> bool:
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'''PIE: DllCharacteristics bit 0x20 signifies high-entropy ASLR'''
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(arch,bits) = get_PE_dll_characteristics(executable)
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if arch == 'i386:x86-64':
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reqbits = IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA
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else: # Unnecessary on 32-bit
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assert(arch == 'i386')
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reqbits = 0
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return (bits & reqbits) == reqbits
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bits = get_PE_dll_characteristics(executable)
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return (bits & IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA) == IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA
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def check_PE_RELOC_SECTION(executable) -> bool:
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'''Check for a reloc section. This is required for functional ASLR.'''
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p = subprocess.Popen([OBJDUMP_CMD, '-h', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([OBJDUMP_CMD, '-h', executable])
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for line in stdout.splitlines():
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if '.reloc' in line:
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return True
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return False
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def check_PE_NX(executable):
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def check_PE_NX(executable) -> bool:
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'''NX: DllCharacteristics bit 0x100 signifies nxcompat (DEP)'''
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(arch,bits) = get_PE_dll_characteristics(executable)
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bits = get_PE_dll_characteristics(executable)
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return (bits & IMAGE_DLL_CHARACTERISTICS_NX_COMPAT) == IMAGE_DLL_CHARACTERISTICS_NX_COMPAT
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def get_MACHO_executable_flags(executable):
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p = subprocess.Popen([OTOOL_CMD, '-vh', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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def get_MACHO_executable_flags(executable) -> List[str]:
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stdout = run_command([OTOOL_CMD, '-vh', executable])
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flags = []
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for line in stdout.splitlines():
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@ -222,10 +199,7 @@ def check_MACHO_LAZY_BINDINGS(executable) -> bool:
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Check for no lazy bindings.
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We don't use or check for MH_BINDATLOAD. See #18295.
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'''
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p = subprocess.Popen([OTOOL_CMD, '-l', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([OTOOL_CMD, '-l', executable])
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for line in stdout.splitlines():
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tokens = line.split()
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@ -238,10 +212,8 @@ def check_MACHO_Canary(executable) -> bool:
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'''
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Check for use of stack canary
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'''
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p = subprocess.Popen([OTOOL_CMD, '-Iv', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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stdout = run_command([OTOOL_CMD, '-Iv', executable])
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ok = False
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for line in stdout.splitlines():
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if '___stack_chk_fail' in line:
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@ -270,7 +242,7 @@ CHECKS = {
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]
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}
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def identify_executable(executable):
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def identify_executable(executable) -> Optional[str]:
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with open(filename, 'rb') as f:
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magic = f.read(4)
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if magic.startswith(b'MZ'):
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@ -292,18 +264,12 @@ if __name__ == '__main__':
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continue
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failed = []
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warning = []
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for (name, func) in CHECKS[etype]:
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if not func(filename):
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if name in NONFATAL:
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warning.append(name)
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else:
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failed.append(name)
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if failed:
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print('%s: failed %s' % (filename, ' '.join(failed)))
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retval = 1
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if warning:
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print('%s: warning %s' % (filename, ' '.join(warning)))
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except IOError:
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print('%s: cannot open' % filename)
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retval = 1
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