X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=kconfig-hardened-check.py;h=35bcad78dd49e5a5107f456278bb09597fa15908;hb=53c4c5130aaaafc939812a82ecb2f93dfed59d1a;hp=c7b2c9bde797544c19ec92b84bee32f36bb643e0;hpb=f31d72a9ab6d7ae62bd1bf75f2ac768af5c17f0b;p=kconfig-hardened-check.git diff --git a/kconfig-hardened-check.py b/kconfig-hardened-check.py index c7b2c9b..35bcad7 100755 --- a/kconfig-hardened-check.py +++ b/kconfig-hardened-check.py @@ -35,6 +35,9 @@ from collections import OrderedDict import re debug_mode = False # set it to True to print the unknown options from the config + +supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ] + checklist = [] @@ -108,29 +111,59 @@ class OR: return False, self.result -def construct_checklist(): +def detect_arch(fname): + with open(fname, 'r') as f: + arch_pattern = re.compile("CONFIG_[a-zA-Z0-9_]*=y") + arch = None + msg = None + print('[+] Trying to detect architecture in "{}"...'.format(fname)) + for line in f.readlines(): + if arch_pattern.match(line): + option, value = line[7:].split('=', 1) + if option in supported_archs: + if not arch: + arch = option + else: + return None, 'more than one supported architecture is detected' + if not arch: + return None, 'failed to detect architecture' + else: + return arch, 'OK' + + +def construct_checklist(arch): modules_not_set = OptCheck('MODULES', 'is not set', 'kspp', 'cut_attack_surface') devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('X86_64', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection')) checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \ OptCheck('DEBUG_RODATA', 'y', 'defconfig', 'self_protection'))) # before v4.11 - checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection')) checklist.append(OR(OptCheck('STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'), \ OptCheck('CC_STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'))) - checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection')) - checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('SLUB_DEBUG', 'y', 'defconfig', 'self_protection')) checklist.append(OR(OptCheck('STRICT_MODULE_RWX', 'y', 'defconfig', 'self_protection'), \ OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \ modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11 - checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason? + if debug_mode or arch == 'X86_64': + checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection')) + if debug_mode or arch == 'X86_64' or arch == 'X86_32': + checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason? + if debug_mode or arch == 'ARM64': + checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection')) + if debug_mode or arch == 'X86_64' or arch == 'ARM64': + checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection')) + if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection')) + if debug_mode or arch == 'ARM': + checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'self_protection')) + checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection')) + if debug_mode or arch == 'ARM64' or arch == 'ARM': + checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('DEBUG_WX', 'y', 'kspp', 'self_protection')) @@ -146,7 +179,6 @@ def construct_checklist(): checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('GCC_PLUGIN_LATENT_ENTROPY', 'y', 'kspp', 'self_protection')) - checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('DEBUG_LIST', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('DEBUG_SG', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('DEBUG_CREDENTIALS', 'y', 'kspp', 'self_protection')) @@ -158,9 +190,21 @@ def construct_checklist(): checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \ modules_not_set)) checklist.append(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection')) # refers to LOCK_DOWN_KERNEL - checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection')) - - checklist.append(OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'my', 'self_protection')) + if debug_mode or arch == 'X86_64' or arch == 'X86_32': + checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection')) + checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection')) + if debug_mode or arch == 'X86_32': + checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection')) + checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection')) + if debug_mode or arch == 'ARM64': + checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection')) + checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'kspp', 'self_protection')) + if debug_mode or arch == 'ARM64' or arch == 'ARM': + checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason? + checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection')) + + if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + checklist.append(OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'my', 'self_protection')) checklist.append(OptCheck('LOCK_DOWN_KERNEL', 'y', 'my', 'self_protection')) # remember about LOCK_DOWN_MANDATORY checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection')) checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'my', 'self_protection')) @@ -169,19 +213,27 @@ def construct_checklist(): checklist.append(OptCheck('PAGE_POISONING_NO_SANITY', 'is not set', 'my', 'self_protection')) checklist.append(OptCheck('PAGE_POISONING_ZERO', 'is not set', 'my', 'self_protection')) checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'my', 'self_protection')) # slab_nomerge + if debug_mode or arch == 'X86_32': + checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection')) - checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) + if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) + if debug_mode or arch == 'ARM': + checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) checklist.append(OptCheck('SECURITY_YAMA', 'y', 'kspp', 'security_policy')) checklist.append(OptCheck('SECURITY_SELINUX_DISABLE', 'is not set', 'kspp', 'security_policy')) checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface')) checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface')) - checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \ - devmem_not_set)) # refers to LOCK_DOWN_KERNEL + if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \ + devmem_not_set)) # refers to LOCK_DOWN_KERNEL checklist.append(OR(OptCheck('IO_STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \ devmem_not_set)) # refers to LOCK_DOWN_KERNEL - checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none' + if debug_mode or arch == 'ARM': + checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \ + devmem_not_set)) # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface')) checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface')) @@ -191,10 +243,14 @@ def construct_checklist(): checklist.append(OptCheck('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('LEGACY_PTYS', 'is not set', 'kspp', 'cut_attack_surface')) - checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface')) - checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface')) - checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface')) checklist.append(OptCheck('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL + if debug_mode or arch == 'X86_64': + checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none' + checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface')) + checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface')) + checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface')) + if debug_mode or arch == 'ARM': + checklist.append(OptCheck('OABI_COMPAT', 'is not set', 'kspp', 'cut_attack_surface')) checklist.append(OptCheck('X86_PTDUMP', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('ZSMALLOC_STAT', 'is not set', 'grsecurity', 'cut_attack_surface')) @@ -229,14 +285,19 @@ def construct_checklist(): checklist.append(OptCheck('IP_SCTP', 'is not set', 'my', 'cut_attack_surface')) checklist.append(OptCheck('FTRACE', 'is not set', 'my', 'cut_attack_surface')) checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface')) + if debug_mode or arch == 'X86_32': + checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'my', 'cut_attack_surface')) - checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'my', 'userspace_protection')) + if debug_mode or arch == 'X86_64' or arch == 'ARM64': + checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'my', 'userspace_protection')) + if debug_mode or arch == 'X86_32' or arch == 'ARM': + checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_protection')) # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test')) -def print_checklist(): - print('[+] Printing kernel hardening preferences...') +def print_checklist(arch): + print('[+] Printing kernel hardening preferences for {}...'.format(arch)) print(' {:<39}|{:^13}|{:^10}|{:^20}'.format( 'option name', 'desired val', 'decision', 'reason')) print(' ' + '=' * 86) @@ -308,27 +369,39 @@ def check_config_file(fname): if __name__ == '__main__': parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config') - parser.add_argument('-p', '--print', action='store_true', help='print hardening preferences') - parser.add_argument('-c', '--config', help='check the config_file against these preferences') - parser.add_argument('--debug', action='store_true', help='enable internal debug mode') + parser.add_argument('-p', '--print', choices=supported_archs, + help='print hardening preferences for selected architecture') + parser.add_argument('-c', '--config', + help='check the config_file against these preferences') + parser.add_argument('--debug', action='store_true', + help='enable internal debug mode') args = parser.parse_args() - construct_checklist() - - if args.print: - print_checklist() - sys.exit(0) - if args.debug: debug_mode = True if args.config: + arch, msg = detect_arch(args.config) + if not arch: + sys.exit('[!] ERROR: {}'.format(msg)) + else: + print('[+] Detected architecture: {}'.format(arch)) + + construct_checklist(arch) check_config_file(args.config) error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), checklist))) + if debug_mode: + sys.exit(0) if error_count == 0: print('[+] config check is PASSED') sys.exit(0) else: sys.exit('[-] config check is NOT PASSED: {} errors'.format(error_count)) + if args.print: + arch = args.print + construct_checklist(arch) + print_checklist(arch) + sys.exit(0) + parser.print_help()