X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=kconfig-hardened-check.py;h=5df4997224b55737424f0da9536e77964cce63bd;hb=refs%2Ftags%2Fv0.5.5;hp=2084ea8bbb63a7b7d4421e984fc067d533c103d1;hpb=918b12cf6f652ad148c885d1a802459e73d20c48;p=kconfig-hardened-check.git diff --git a/kconfig-hardened-check.py b/kconfig-hardened-check.py index 2084ea8..5df4997 100755 --- a/kconfig-hardened-check.py +++ b/kconfig-hardened-check.py @@ -13,11 +13,12 @@ # N.B Hardening command line parameters: # slub_debug=FZP # slab_nomerge -# kernel.kptr_restrict=1 -# lockdown=1 (is it changed?) # page_alloc.shuffle=1 # iommu=force (does it help against DMA attacks?) # page_poison=1 (if enabled) +# init_on_alloc=1 +# init_on_free=1 +# loadpin.enforce=1 # # Mitigations of CPU vulnerabilities: # Аrch-independent: @@ -28,22 +29,30 @@ # spec_store_bypass_disable=on # l1tf=full,force # mds=full,nosmt +# tsx=off # ARM64: # kpti=on # ssbd=force-on # # N.B. Hardening sysctls: -# net.core.bpf_jit_harden=2 -# kptr_restrict=2 -# vm.unprivileged_userfaultfd=0 +# kernel.kptr_restrict=2 +# kernel.dmesg_restrict=1 # kernel.perf_event_paranoid=3 -# kernel.yama.ptrace_scope=1 (or even 3?) +# kernel.kexec_load_disabled=1 +# kernel.yama.ptrace_scope=3 +# user.max_user_namespaces=0 # kernel.unprivileged_bpf_disabled=1 +# net.core.bpf_jit_harden=2 +# +# vm.unprivileged_userfaultfd=0 +# +# dev.tty.ldisc_autoload=0 +# fs.protected_symlinks=1 +# fs.protected_hardlinks=1 +# fs.protected_fifos=2 +# fs.protected_regular=2 # fs.suid_dumpable=0 -# fs.protected_symlinks = 1 -# fs.protected_hardlinks = 1 -# fs.protected_fifos = 2 -# fs.protected_regular = 2 +# kernel.modules_disabled=1 import sys from argparse import ArgumentParser @@ -51,8 +60,13 @@ from collections import OrderedDict import re import json -debug_mode = False # set it to True to print the unknown options from the config -json_mode = False # if True, print results in JSON format +# debug_mode enables: +# - reporting about unknown kernel options in the config, +# - verbose printing of ComplexOptChecks (OR, AND). +debug_mode = False + +# json_mode is for printing results in JSON format +json_mode = False supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ] config_checklist = [] @@ -84,9 +98,6 @@ class OptCheck: else: return False, self.result - def __repr__(self): - return '{} = {}'.format(self.name, self.state) - class VerCheck: def __init__(self, ver_expected): @@ -135,7 +146,7 @@ class ComplexOptCheck: class OR(ComplexOptCheck): - # self.opts[0] is the option which this OR-check is about. + # self.opts[0] is the option that this OR-check is about. # Use case: # OR(, ) # OR(, ) @@ -157,7 +168,7 @@ class OR(ComplexOptCheck): class AND(ComplexOptCheck): - # self.opts[0] is the option which this AND-check is about. + # self.opts[0] is the option that this AND-check is about. # Use case: AND(, ) # Suboption is not checked if checking of the main_option is failed. @@ -220,7 +231,7 @@ def detect_version(fname): def construct_checklist(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 + devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCKDOWN checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection')) checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \ @@ -232,37 +243,37 @@ def construct_checklist(checklist, arch): OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \ modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11 checklist.append(OptCheck('GCC_PLUGINS', 'y', 'defconfig', 'self_protection')) - if debug_mode or arch == 'X86_64' or arch == 'X86_32': + checklist.append(OR(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'), \ + VerCheck((5, 5)))) # REFCOUNT_FULL is enabled by default since v5.5 + iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'defconfig', 'self_protection') # is needed for mitigating DMA attacks + checklist.append(iommu_support_is_set) + if arch == 'X86_64' or arch == 'X86_32': checklist.append(OptCheck('MICROCODE', 'y', 'defconfig', 'self_protection')) # is needed for mitigating CPU bugs checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection')) checklist.append(OR(OptCheck('X86_UMIP', 'y', 'defconfig', 'self_protection'), \ OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection'))) - iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'defconfig', 'self_protection') # is needed for mitigating DMA attacks - checklist.append(iommu_support_is_set) checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason? - if debug_mode or arch == 'X86_64': + if arch == 'X86_64': checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection')) checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'defconfig', 'self_protection'), \ iommu_support_is_set)) checklist.append(AND(OptCheck('AMD_IOMMU', 'y', 'defconfig', 'self_protection'), \ iommu_support_is_set)) - if debug_mode or arch == 'ARM64': + if arch == 'ARM64': checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('HARDEN_EL2_VECTORS', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('RODATA_FULL_DEFAULT_ENABLED', 'y', 'defconfig', 'self_protection')) - if debug_mode or arch == 'X86_64' or arch == 'ARM64': + if 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': + if arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection')) 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')) + if arch == 'ARM': checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'defconfig', 'self_protection')) - if debug_mode or arch == 'ARM64' or arch == 'ARM': - checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection')) + if arch == 'ARM64' or arch == 'ARM': checklist.append(OptCheck('HARDEN_BRANCH_PREDICTOR', 'y', 'defconfig', 'self_protection')) checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection')) @@ -290,103 +301,108 @@ def construct_checklist(checklist, arch): checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \ modules_not_set)) 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': + modules_not_set)) # refers to LOCKDOWN + checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'kspp', 'self_protection'), \ + OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection'))) + checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'kspp', 'self_protection')) + checklist.append(OR(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'kspp', 'self_protection'), \ + OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection'))) # before v5.3 + if arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'kspp', 'self_protection') + checklist.append(stackleak_is_set) + checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \ + stackleak_is_set)) + checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \ + stackleak_is_set)) + if 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': + if arch == 'X86_32': + checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection')) checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection')) - if debug_mode or arch == 'ARM64': + if arch == 'ARM64': checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection')) - if debug_mode or arch == 'ARM64' or arch == 'ARM': + if 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')) - checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'clipos', 'self_protection'), \ - OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection'))) - checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'clipos', 'self_protection')) - checklist.append(OR(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \ - OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection'))) checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection')) checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection')) checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd) checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \ randstruct_is_set)) - if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': - stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection') - checklist.append(stackleak_is_set) - checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \ - stackleak_is_set)) - checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \ - stackleak_is_set)) - if debug_mode or arch == 'X86_64' or arch == 'X86_32': - checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection')) + checklist.append(OptCheck('RANDOM_TRUST_BOOTLOADER', 'is not set', 'clipos', 'self_protection')) + checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection')) + if arch == 'X86_64' or arch == 'X86_32': checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \ iommu_support_is_set)) checklist.append(AND(OptCheck('INTEL_IOMMU_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \ iommu_support_is_set)) + if arch == 'X86_32': + checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'clipos', 'self_protection'), \ + iommu_support_is_set)) checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection')) checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd) - if debug_mode or arch == 'X86_64': + if arch == 'X86_64': checklist.append(AND(OptCheck('AMD_IOMMU_V2', 'y', 'my', 'self_protection'), \ iommu_support_is_set)) - if debug_mode or arch == 'X86_32': - checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection')) - if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + if 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': + if 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_LOADPIN', 'y', 'my', 'security_policy')) # needs userspace support - checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM', 'y', 'my', 'security_policy')) - checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM_EARLY', 'y', 'my', 'security_policy')) - checklist.append(OptCheck('LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y', 'my', 'security_policy')) + checklist.append(OR(OptCheck('SECURITY_WRITABLE_HOOKS', 'is not set', 'my', 'security_policy'), \ + OptCheck('SECURITY_SELINUX_DISABLE', 'is not set', 'kspp', 'security_policy'))) + checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM', 'y', 'clipos', 'security_policy')) + checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM_EARLY', 'y', 'clipos', 'security_policy')) + checklist.append(OptCheck('LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y', 'clipos', 'security_policy')) + loadpin_is_set = OptCheck('SECURITY_LOADPIN', 'y', 'my', 'security_policy') # needs userspace support + checklist.append(loadpin_is_set) + checklist.append(AND(OptCheck('SECURITY_LOADPIN_ENFORCE', 'y', 'my', 'security_policy'), \ + loadpin_is_set)) checklist.append(OptCheck('SECURITY_SAFESETID', 'y', 'my', 'security_policy')) - checklist.append(OptCheck('SECURITY_WRITABLE_HOOKS', 'is not set', 'my', 'security_policy')) checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface')) checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface')) - if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32': + if 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 + devmem_not_set)) # refers to LOCKDOWN 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 - if debug_mode or arch == 'ARM': + devmem_not_set)) # refers to LOCKDOWN + if 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 + devmem_not_set)) # refers to LOCKDOWN + if arch == 'X86_64': + checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none' + checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface')) - checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface')) + checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('COMPAT_VDSO', 'is not set', 'kspp', 'cut_attack_surface')) checklist.append(OptCheck('BINFMT_MISC', 'is not set', 'kspp', 'cut_attack_surface')) checklist.append(OptCheck('INET_DIAG', 'is not set', 'kspp', 'cut_attack_surface')) - 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('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('LEGACY_PTYS', '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('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCKDOWN + 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('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')) checklist.append(OptCheck('PAGE_OWNER', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('DEBUG_KMEMLEAK', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('BINFMT_AOUT', 'is not set', 'grsecurity', 'cut_attack_surface')) - checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL + checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('UPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) - checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface')) + checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('PROC_VMCORE', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('PROC_PAGE_MONITOR', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('USELIB', 'is not set', 'grsecurity', 'cut_attack_surface')) @@ -394,45 +410,61 @@ def construct_checklist(checklist, arch): checklist.append(OptCheck('USERFAULTFD', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('HWPOISON_INJECT', 'is not set', 'grsecurity', 'cut_attack_surface')) checklist.append(OptCheck('MEM_SOFT_DIRTY', 'is not set', 'grsecurity', 'cut_attack_surface')) - checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL - checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL + checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('NOTIFIER_ERROR_INJECTION','is not set', 'grsecurity', 'cut_attack_surface')) - checklist.append(OptCheck('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL - checklist.append(OptCheck('ACPI_APEI_EINJ', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL - checklist.append(OptCheck('PROFILING', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL - 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('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('X86_IOPL_IOPERM', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('EFI_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCKDOWN + if arch == 'X86_64' or arch == 'X86_32': + checklist.append(OptCheck('X86_INTEL_TSX_MODE_OFF', 'y', 'clipos', 'cut_attack_surface')) # tsx=off + checklist.append(OptCheck('STAGING', 'is not set', 'clipos', 'cut_attack_surface')) 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')) # no, this info is needed for this check :) 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('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive) + checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCKDOWN (permissive) checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0 - checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(OptCheck('X86_MSR', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCKDOWN + checklist.append(OptCheck('X86_CPUID', 'is not set', 'clipos', 'cut_attack_surface')) + checklist.append(AND(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'), \ + VerCheck((5, 1)))) # LDISC_AUTOLOAD can be disabled since v5.1 + + checklist.append(OptCheck('AIO', 'is not set', 'grapheneos', 'cut_attack_surface')) - checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive) + checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCKDOWN (permissive) checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface')) checklist.append(OptCheck('IP_DCCP', 'is not set', 'my', 'cut_attack_surface')) 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('FTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCKDOWN checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface')) checklist.append(OptCheck('VIDEO_VIVID', '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')) - if debug_mode or arch == 'ARM64': + checklist.append(OptCheck('INTEGRITY', 'y', 'defconfig', 'userspace_hardening')) + if arch == 'ARM64': checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', 'userspace_hardening')) - if debug_mode or arch == 'X86_64' or arch == 'ARM64': + if arch == 'ARM' or arch == 'X86_32': + checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'userspace_hardening')) + if arch == 'X86_64' or arch == 'ARM64': checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'clipos', 'userspace_hardening')) - if debug_mode or arch == 'X86_32' or arch == 'ARM': + if arch == 'X86_32' or arch == 'ARM': checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_hardening')) # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test')) +def print_opt(opt, with_results): + print('CONFIG_{:<38}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='') + if with_results: + print('| {}'.format(opt.result), end='') + print() + + def print_checklist(checklist, with_results): if json_mode: opts = [] @@ -444,21 +476,37 @@ def print_checklist(checklist, with_results): print(json.dumps(opts)) return - # header - print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='') + # table header sep_line_len = 91 if with_results: - print('| {}'.format('check result'), end='') sep_line_len += 30 + print('=' * sep_line_len) + print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='') + if with_results: + print('| {}'.format('check result'), end='') print() - print('=' * sep_line_len) + # table contents for opt in checklist: - print('CONFIG_{:<38}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='') - if with_results: - print('| {}'.format(opt.result), end='') - print() + if debug_mode and hasattr(opt, 'opts'): + print(' {:87}'.format('<<< ' + opt.__class__.__name__ + ' >>>'), end='') + if with_results: + print('| {}'.format(opt.result), end='') + print() + for o in opt.opts: + if hasattr(o, 'ver_expected'): + ver_req = 'kernel version >= ' + str(o.ver_expected[0]) + '.' + str(o.ver_expected[1]) + print('{:<91}'.format(ver_req), end='') + if with_results: + print('| {}'.format(o.result), end='') + print() + else: + print_opt(o, with_results) + else: + print_opt(opt, with_results) + if debug_mode: + print('-' * sep_line_len) print() @@ -484,7 +532,7 @@ def check_config_file(checklist, fname): opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]* is not set") if not json_mode: - print('[+] Checking "{}" against hardening preferences...'.format(fname)) + print('[+] Checking "{}" against {} hardening preferences...'.format(fname, arch)) for line in f.readlines(): line = line.strip() option = None @@ -506,10 +554,17 @@ def check_config_file(checklist, fname): perform_checks(checklist, parsed_options) if debug_mode: - known_options = [opt.name for opt in checklist] + known_options = [] + for opt in checklist: + if hasattr(opt, 'opts'): + for o in opt.opts: + if hasattr(o, 'name'): + known_options.append(o.name) + else: + known_options.append(opt.name) for option, value in parsed_options.items(): if option not in known_options: - print("DEBUG: dunno about option {} ({})".format(option, value)) + print('DEBUG: dunno about option {} ({})'.format(option, value)) print_checklist(checklist, True) @@ -521,13 +576,14 @@ if __name__ == '__main__': 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') + help='enable verbose debug mode') parser.add_argument('--json', action='store_true', help='print results in JSON format') args = parser.parse_args() if args.debug: debug_mode = True + print('[!] WARNING: debug mode is enabled') if args.json: json_mode = True if debug_mode and json_mode: