X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=kconfig-hardened-check.py;h=4c53b15c31ffde81eac373a0e15b495f08ee80f1;hb=e18ade0645ad4cca683281323d3469ea2bb89fa7;hp=f22437ac3a4c1660db3f26a6bc5e7b025984e83a;hpb=6e51c138b7ec93c528f9f5ff516bf761856b8d0d;p=kconfig-hardened-check.git diff --git a/kconfig-hardened-check.py b/kconfig-hardened-check.py index f22437a..4c53b15 100755 --- a/kconfig-hardened-check.py +++ b/kconfig-hardened-check.py @@ -2,7 +2,8 @@ # # This script helps me to check the Linux kernel Kconfig option list -# against my hardening preferences for x86_64. Let the computers do their job! +# against my hardening preferences for X86_64, ARM64, X86_32, and ARM. +# Let the computers do their job! # # Author: Alexander Popov # @@ -17,17 +18,23 @@ # kernel.kptr_restrict=1 # lockdown=1 # -# spectre_v2=on -# pti=on -# spec_store_bypass_disable=on -# l1tf=full,force -# +# Mitigations of CPU vulnerabilities: +# Аrch-independent: +# mitigations=auto,nosmt +# X86: +# spectre_v2=on +# pti=on +# spec_store_bypass_disable=on +# l1tf=full,force +# mds=full,nosmt +# ARM64: +# ? CONFIG_HARDEN_BRANCH_PREDICTOR +# kpti=on +# ssbd=force-on # # N.B. Hardening sysctl's: # net.core.bpf_jit_harden -# -# -# TODO: add hardening preferences for ARM +# kptr_restrict=2 import sys from argparse import ArgumentParser @@ -36,7 +43,7 @@ import re debug_mode = False # set it to True to print the unknown options from the config -supported_archs = [ 'X86_64' ] +supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ] checklist = [] @@ -70,14 +77,11 @@ class OptCheck: return '{} = {}'.format(self.name, self.state) -class OR: +class ComplexOptCheck: def __init__(self, *opts): self.opts = opts self.result = None - # self.opts[0] is the option which this OR-check is about. - # Use case: OR(, ) - @property def name(self): return self.opts[0].name @@ -98,19 +102,47 @@ class OR: def reason(self): return self.opts[0].reason + +class OR(ComplexOptCheck): + # self.opts[0] is the option which this OR-check is about. + # Use case: + # OR(, ) + # OR(, ) + def check(self): + if not self.opts: + sys.exit('[!] ERROR: invalid OR check') + for i, opt in enumerate(self.opts): - result, msg = opt.check() - if result: + ret, msg = opt.check() + if ret: if i == 0: self.result = opt.result else: - self.result = 'CONFIG_{}: {} ("{}")'.format(opt.name, opt.result, opt.expected) + self.result = 'OK: CONFIG_{} "{}"'.format(opt.name, opt.expected) return True, self.result self.result = self.opts[0].result return False, self.result +class AND(ComplexOptCheck): + # self.opts[0] is the option which this AND-check is about. + # Use case: AND(, ) + # Suboption is not checked if checking of the main_option is failed. + + def check(self): + for i, opt in reversed(list(enumerate(self.opts))): + ret, msg = opt.check() + if i == 0: + self.result = opt.result + return ret, self.result + elif not ret: + self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name) + return False, self.result + + sys.exit('[!] ERROR: invalid AND check') + + def detect_arch(fname): with open(fname, 'r') as f: arch_pattern = re.compile("CONFIG_[a-zA-Z0-9_]*=y") @@ -136,74 +168,119 @@ def construct_checklist(arch): 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_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')) checklist.append(OptCheck('SCHED_STACK_END_CHECK', 'y', 'kspp', 'self_protection')) - checklist.append(OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('SLAB_FREELIST_HARDENED', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('SLAB_FREELIST_RANDOM', 'y', 'kspp', 'self_protection')) - checklist.append(OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection')) - checklist.append(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection')) checklist.append(OptCheck('FORTIFY_SOURCE', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('GCC_PLUGINS', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('GCC_PLUGIN_RANDSTRUCT', 'y', 'kspp', 'self_protection')) 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')) checklist.append(OptCheck('DEBUG_NOTIFIERS', 'y', 'kspp', 'self_protection')) + page_poisoning_is_set = OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection') + checklist.append(page_poisoning_is_set) + hardened_usercopy_is_set = OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection') + checklist.append(hardened_usercopy_is_set) + checklist.append(AND(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection'), \ + hardened_usercopy_is_set)) checklist.append(OR(OptCheck('MODULE_SIG', 'y', 'kspp', 'self_protection'), \ modules_not_set)) checklist.append(OR(OptCheck('MODULE_SIG_ALL', 'y', 'kspp', 'self_protection'), \ modules_not_set)) 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')) + checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \ + modules_not_set)) # refers to LOCK_DOWN_KERNEL + 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': + stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'my', 'self_protection') + checklist.append(stackleak_is_set) + checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'my', 'self_protection'), \ + stackleak_is_set)) + checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE','is not set', 'my', 'self_protection'), \ + stackleak_is_set)) 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')) - checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'my', 'self_protection')) # breaks systemd? - checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'self_protection')) - 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('STATIC_USERMODEHELPER', 'y', 'my', 'self_protection')) # needs userspace support (systemd) + checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'self_protection')) # needs userspace support + checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd) checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'my', 'self_protection')) # slab_nomerge - - checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) + checklist.append(AND(OptCheck('PAGE_POISONING_NO_SANITY', 'is not set', 'my', 'self_protection'), \ + page_poisoning_is_set)) + checklist.append(AND(OptCheck('PAGE_POISONING_ZERO', 'is not set', 'my', 'self_protection'), \ + page_poisoning_is_set)) + if debug_mode or arch == 'X86_32': + checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection')) + if debug_mode or arch == 'ARM': + checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'my', 'self_protection')) + + if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) # and choose your favourite LSM + if debug_mode or arch == 'ARM': + checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) # and choose your favourite LSM 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(modules_not_set) + checklist.append(devmem_not_set) 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')) @@ -213,10 +290,14 @@ def construct_checklist(arch): 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')) @@ -243,6 +324,12 @@ def construct_checklist(arch): checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL + checklist.append(OptCheck('KSM', 'is not set', 'clipos', 'cut_attack_surface')) # to prevent FLUSH+RELOAD attack + checklist.append(OptCheck('IKCONFIG', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(OptCheck('KALLSYMS', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(OptCheck('X86_VSYSCALL_EMULATION', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive) checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive) checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface')) @@ -251,29 +338,36 @@ def construct_checklist(arch): 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 == 'ARM64': + checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', '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(arch): print('[+] Printing kernel hardening preferences for {}...'.format(arch)) - print(' {:<39}|{:^13}|{:^10}|{:^20}'.format( + print('{:^40}|{:^13}|{:^10}|{:^20}'.format( 'option name', 'desired val', 'decision', 'reason')) - print(' ' + '=' * 86) + print('=' * 87) for opt in checklist: - print(' CONFIG_{:<32}|{:^13}|{:^10}|{:^20}'.format( + print('CONFIG_{:<33}|{:^13}|{:^10}|{:^20}'.format( opt.name, opt.expected, opt.decision, opt.reason)) print() def print_check_results(): - print(' {:<39}|{:^13}|{:^10}|{:^20}||{:^28}'.format( + print('{:^40}|{:^13}|{:^10}|{:^20}||{:^28}'.format( 'option name', 'desired val', 'decision', 'reason', 'check result')) - print(' ' + '=' * 115) + print('=' * 116) for opt in checklist: - print(' CONFIG_{:<32}|{:^13}|{:^10}|{:^20}||{:^28}'.format( + print('CONFIG_{:<33}|{:^13}|{:^10}|{:^20}||{:^28}'.format( opt.name, opt.expected, opt.decision, opt.reason, opt.result)) print() @@ -351,11 +445,11 @@ if __name__ == '__main__': construct_checklist(arch) check_config_file(args.config) error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), checklist))) - if error_count == 0: - print('[+] config check is PASSED') + ok_count = len(list(filter(lambda opt: opt.result.startswith('OK'), checklist))) + if debug_mode: sys.exit(0) - else: - sys.exit('[-] config check is NOT PASSED: {} errors'.format(error_count)) + print('[+] config check is finished: \'OK\' - {} / \'FAIL\' - {}'.format(ok_count, error_count)) + sys.exit(0) if args.print: arch = args.print