4 # This script helps me to check the Linux kernel Kconfig option list
5 # against my hardening preferences for X86_64, ARM64, X86_32, and ARM.
6 # Let the computers do their job!
8 # Author: Alexander Popov <alex.popov@linux.com>
10 # Please don't cry if my Python code looks like C.
13 # N.B Hardening command line parameters:
18 # kernel.kptr_restrict=1
21 # Mitigations of CPU vulnerabilities:
23 # mitigations=auto,nosmt
27 # spec_store_bypass_disable=on
31 # ? CONFIG_HARDEN_BRANCH_PREDICTOR
35 # N.B. Hardening sysctl's:
36 # net.core.bpf_jit_harden
40 from argparse import ArgumentParser
41 from collections import OrderedDict
44 debug_mode = False # set it to True to print the unknown options from the config
45 json_mode = False # if True, print results in JSON format
47 supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ]
53 def __init__(self, name, expected, decision, reason):
55 self.expected = expected
56 self.decision = decision
62 if self.expected == self.state:
64 elif self.state is None:
65 if self.expected == 'is not set':
66 self.result = 'OK: not found'
68 self.result = 'FAIL: not found'
70 self.result = 'FAIL: "' + self.state + '"'
72 if self.result.startswith('OK'):
73 return True, self.result
75 return False, self.result
78 return '{} = {}'.format(self.name, self.state)
81 class ComplexOptCheck:
82 def __init__(self, *opts):
88 return self.opts[0].name
92 return self.opts[0].expected
96 return self.opts[0].state
100 return self.opts[0].decision
104 return self.opts[0].reason
107 class OR(ComplexOptCheck):
108 # self.opts[0] is the option which this OR-check is about.
110 # OR(<X_is_hardened>, <X_is_disabled>)
111 # OR(<X_is_hardened>, <X_is_hardened_old>)
115 sys.exit('[!] ERROR: invalid OR check')
117 for i, opt in enumerate(self.opts):
118 ret, msg = opt.check()
121 self.result = opt.result
123 self.result = 'OK: CONFIG_{} "{}"'.format(opt.name, opt.expected)
124 return True, self.result
125 self.result = self.opts[0].result
126 return False, self.result
129 class AND(ComplexOptCheck):
130 # self.opts[0] is the option which this AND-check is about.
131 # Use case: AND(<suboption>, <main_option>)
132 # Suboption is not checked if checking of the main_option is failed.
135 for i, opt in reversed(list(enumerate(self.opts))):
136 ret, msg = opt.check()
138 self.result = opt.result
139 return ret, self.result
141 self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name)
142 return False, self.result
144 sys.exit('[!] ERROR: invalid AND check')
147 def detect_arch(fname):
148 with open(fname, 'r') as f:
149 arch_pattern = re.compile("CONFIG_[a-zA-Z0-9_]*=y")
153 print('[+] Trying to detect architecture in "{}"...'.format(fname))
154 for line in f.readlines():
155 if arch_pattern.match(line):
156 option, value = line[7:].split('=', 1)
157 if option in supported_archs:
161 return None, 'more than one supported architecture is detected'
163 return None, 'failed to detect architecture'
168 def construct_checklist(arch):
169 modules_not_set = OptCheck('MODULES', 'is not set', 'kspp', 'cut_attack_surface')
170 devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCK_DOWN_KERNEL
172 checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection'))
173 checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \
174 OptCheck('DEBUG_RODATA', 'y', 'defconfig', 'self_protection'))) # before v4.11
175 checklist.append(OR(OptCheck('STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'), \
176 OptCheck('CC_STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection')))
177 checklist.append(OptCheck('SLUB_DEBUG', 'y', 'defconfig', 'self_protection'))
178 checklist.append(OR(OptCheck('STRICT_MODULE_RWX', 'y', 'defconfig', 'self_protection'), \
179 OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \
180 modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
181 if debug_mode or arch == 'X86_64':
182 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection'))
183 checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection'))
184 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
185 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection'))
186 checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection'))
187 checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection'))
188 checklist.append(OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection'))
189 checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason?
190 if debug_mode or arch == 'ARM64':
191 checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection'))
192 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
193 checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection'))
194 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
195 checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection'))
196 if debug_mode or arch == 'ARM':
197 checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'self_protection'))
198 checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection'))
199 if debug_mode or arch == 'ARM64' or arch == 'ARM':
200 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'))
202 checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection'))
203 checklist.append(OptCheck('DEBUG_WX', 'y', 'kspp', 'self_protection'))
204 checklist.append(OptCheck('SCHED_STACK_END_CHECK', 'y', 'kspp', 'self_protection'))
205 checklist.append(OptCheck('SLAB_FREELIST_HARDENED', 'y', 'kspp', 'self_protection'))
206 checklist.append(OptCheck('SLAB_FREELIST_RANDOM', 'y', 'kspp', 'self_protection'))
207 checklist.append(OptCheck('FORTIFY_SOURCE', 'y', 'kspp', 'self_protection'))
208 checklist.append(OptCheck('GCC_PLUGINS', 'y', 'kspp', 'self_protection'))
209 randstruct_is_set = OptCheck('GCC_PLUGIN_RANDSTRUCT', 'y', 'kspp', 'self_protection')
210 checklist.append(randstruct_is_set)
211 checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK', 'y', 'kspp', 'self_protection'))
212 checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection'))
213 checklist.append(OptCheck('GCC_PLUGIN_LATENT_ENTROPY', 'y', 'kspp', 'self_protection'))
214 checklist.append(OptCheck('DEBUG_LIST', 'y', 'kspp', 'self_protection'))
215 checklist.append(OptCheck('DEBUG_SG', 'y', 'kspp', 'self_protection'))
216 checklist.append(OptCheck('DEBUG_CREDENTIALS', 'y', 'kspp', 'self_protection'))
217 checklist.append(OptCheck('DEBUG_NOTIFIERS', 'y', 'kspp', 'self_protection'))
218 page_poisoning_is_set = OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')
219 checklist.append(page_poisoning_is_set)
220 hardened_usercopy_is_set = OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection')
221 checklist.append(hardened_usercopy_is_set)
222 checklist.append(AND(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection'), \
223 hardened_usercopy_is_set))
224 checklist.append(OR(OptCheck('MODULE_SIG', 'y', 'kspp', 'self_protection'), \
226 checklist.append(OR(OptCheck('MODULE_SIG_ALL', 'y', 'kspp', 'self_protection'), \
228 checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \
230 checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \
231 modules_not_set)) # refers to LOCK_DOWN_KERNEL
232 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
233 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection'))
234 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection'))
235 if debug_mode or arch == 'X86_32':
236 checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection'))
237 checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection'))
238 if debug_mode or arch == 'ARM64':
239 checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection'))
240 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'kspp', 'self_protection'))
241 if debug_mode or arch == 'ARM64' or arch == 'ARM':
242 checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason?
243 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection'))
245 checklist.append(OptCheck('LOCK_DOWN_KERNEL', 'y', 'clipos', 'self_protection')) # remember about LOCK_DOWN_MANDATORY
246 checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection'))
247 checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection'))
248 checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd)
249 checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge
250 checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \
252 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
253 stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection')
254 checklist.append(stackleak_is_set)
255 checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
257 checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE','is not set', 'clipos', 'self_protection'), \
259 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
260 checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection'))
261 checklist.append(OptCheck('MICROCODE', 'y', 'clipos', 'self_protection')) # is needed for mitigating CPU bugs
262 iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'clipos', 'self_protection') # is needed for mitigating DMA attacks
263 checklist.append(iommu_support_is_set)
264 checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'clipos', 'self_protection'), \
265 iommu_support_is_set))
266 checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \
267 iommu_support_is_set))
268 checklist.append(AND(OptCheck('INTEL_IOMMU_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
269 iommu_support_is_set))
271 if debug_mode or arch == 'X86_64':
272 checklist.append(AND(OptCheck('AMD_IOMMU', 'y', 'my', 'self_protection'), \
273 iommu_support_is_set))
274 checklist.append(AND(OptCheck('AMD_IOMMU_V2', 'y', 'my', 'self_protection'), \
275 iommu_support_is_set))
276 checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection'))
277 checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'self_protection')) # needs userspace support
278 checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd)
279 checklist.append(AND(OptCheck('PAGE_POISONING_NO_SANITY', 'is not set', 'my', 'self_protection'), \
280 page_poisoning_is_set))
281 checklist.append(AND(OptCheck('PAGE_POISONING_ZERO', 'is not set', 'my', 'self_protection'), \
282 page_poisoning_is_set))
283 if debug_mode or arch == 'X86_32':
284 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection'))
285 if debug_mode or arch == 'ARM':
286 checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'my', 'self_protection'))
288 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
289 checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) # and choose your favourite LSM
290 if debug_mode or arch == 'ARM':
291 checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) # and choose your favourite LSM
292 checklist.append(OptCheck('SECURITY_YAMA', 'y', 'kspp', 'security_policy'))
294 checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface'))
295 checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface'))
296 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
297 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \
298 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
300 checklist.append(modules_not_set)
301 checklist.append(devmem_not_set)
302 checklist.append(OR(OptCheck('IO_STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
303 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
304 if debug_mode or arch == 'ARM':
305 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
306 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
307 checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
308 checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface'))
309 checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface'))
310 checklist.append(OptCheck('COMPAT_VDSO', 'is not set', 'kspp', 'cut_attack_surface'))
311 checklist.append(OptCheck('BINFMT_MISC', 'is not set', 'kspp', 'cut_attack_surface'))
312 checklist.append(OptCheck('INET_DIAG', 'is not set', 'kspp', 'cut_attack_surface'))
313 checklist.append(OptCheck('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
314 checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
315 checklist.append(OptCheck('LEGACY_PTYS', 'is not set', 'kspp', 'cut_attack_surface'))
316 checklist.append(OptCheck('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
317 if debug_mode or arch == 'X86_64':
318 checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none'
319 checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface'))
320 checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface'))
321 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface'))
322 if debug_mode or arch == 'ARM':
323 checklist.append(OptCheck('OABI_COMPAT', 'is not set', 'kspp', 'cut_attack_surface'))
325 checklist.append(OptCheck('X86_PTDUMP', 'is not set', 'grsecurity', 'cut_attack_surface'))
326 checklist.append(OptCheck('ZSMALLOC_STAT', 'is not set', 'grsecurity', 'cut_attack_surface'))
327 checklist.append(OptCheck('PAGE_OWNER', 'is not set', 'grsecurity', 'cut_attack_surface'))
328 checklist.append(OptCheck('DEBUG_KMEMLEAK', 'is not set', 'grsecurity', 'cut_attack_surface'))
329 checklist.append(OptCheck('BINFMT_AOUT', 'is not set', 'grsecurity', 'cut_attack_surface'))
330 checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
331 checklist.append(OptCheck('UPROBES', 'is not set', 'grsecurity', 'cut_attack_surface'))
332 checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface'))
333 checklist.append(OptCheck('PROC_VMCORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
334 checklist.append(OptCheck('PROC_PAGE_MONITOR', 'is not set', 'grsecurity', 'cut_attack_surface'))
335 checklist.append(OptCheck('USELIB', 'is not set', 'grsecurity', 'cut_attack_surface'))
336 checklist.append(OptCheck('CHECKPOINT_RESTORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
337 checklist.append(OptCheck('USERFAULTFD', 'is not set', 'grsecurity', 'cut_attack_surface'))
338 checklist.append(OptCheck('HWPOISON_INJECT', 'is not set', 'grsecurity', 'cut_attack_surface'))
339 checklist.append(OptCheck('MEM_SOFT_DIRTY', 'is not set', 'grsecurity', 'cut_attack_surface'))
340 checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
341 checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
342 checklist.append(OptCheck('NOTIFIER_ERROR_INJECTION','is not set', 'grsecurity', 'cut_attack_surface'))
344 checklist.append(OptCheck('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
345 checklist.append(OptCheck('ACPI_APEI_EINJ', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
346 checklist.append(OptCheck('PROFILING', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
347 checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
348 checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
350 checklist.append(OptCheck('KSM', 'is not set', 'clipos', 'cut_attack_surface')) # to prevent FLUSH+RELOAD attack
351 checklist.append(OptCheck('IKCONFIG', 'is not set', 'clipos', 'cut_attack_surface'))
352 checklist.append(OptCheck('KALLSYMS', 'is not set', 'clipos', 'cut_attack_surface'))
353 checklist.append(OptCheck('X86_VSYSCALL_EMULATION', 'is not set', 'clipos', 'cut_attack_surface'))
354 checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface'))
355 checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
356 checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0
357 checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'))
359 checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
360 checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface'))
361 checklist.append(OptCheck('IP_DCCP', 'is not set', 'my', 'cut_attack_surface'))
362 checklist.append(OptCheck('IP_SCTP', 'is not set', 'my', 'cut_attack_surface'))
363 checklist.append(OptCheck('FTRACE', 'is not set', 'my', 'cut_attack_surface'))
364 checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface'))
365 if debug_mode or arch == 'X86_32':
366 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'my', 'cut_attack_surface'))
368 if debug_mode or arch == 'ARM64':
369 checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', 'userspace_protection'))
370 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
371 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'clipos', 'userspace_protection'))
372 if debug_mode or arch == 'X86_32' or arch == 'ARM':
373 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_protection'))
375 # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test'))
378 def print_checks(arch=None):
382 opt = ['CONFIG_'+o.name, o.expected, o.decision, o.reason]
389 print('[+] Printing kernel hardening preferences for {}...'.format(arch))
392 print('{:^40}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
395 print('||{:^28}'.format('check result'), end='')
399 print('=' * sep_line_len)
401 for opt in checklist:
402 print('CONFIG_{:<33}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='')
404 print('||{:^28}'.format(opt.result), end='')
409 def get_option_state(options, name):
410 return options.get(name, None)
413 def perform_checks(parsed_options):
414 for opt in checklist:
415 if hasattr(opt, 'opts'):
417 o.state = get_option_state(parsed_options, o.name)
419 opt.state = get_option_state(parsed_options, opt.name)
423 def check_config_file(fname):
424 with open(fname, 'r') as f:
425 parsed_options = OrderedDict()
426 opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]*=[a-zA-Z0-9_\"]*")
427 opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]* is not set")
430 print('[+] Checking "{}" against hardening preferences...'.format(fname))
431 for line in f.readlines():
436 if opt_is_on.match(line):
437 option, value = line[7:].split('=', 1)
438 elif opt_is_off.match(line):
439 option, value = line[9:].split(' ', 1)
440 if value != 'is not set':
441 sys.exit('[!] ERROR: bad disabled config option "{}"'.format(line))
443 if option in parsed_options:
444 sys.exit('[!] ERROR: config option "{}" exists multiple times'.format(line))
446 if option is not None:
447 parsed_options[option] = value
449 perform_checks(parsed_options)
452 known_options = [opt.name for opt in checklist]
453 for option, value in parsed_options.items():
454 if option not in known_options:
455 print("DEBUG: dunno about option {} ({})".format(option, value))
460 if __name__ == '__main__':
461 parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config')
462 parser.add_argument('-p', '--print', choices=supported_archs,
463 help='print hardening preferences for selected architecture')
464 parser.add_argument('-c', '--config',
465 help='check the config_file against these preferences')
466 parser.add_argument('--debug', action='store_true',
467 help='enable internal debug mode')
468 parser.add_argument('--json', action='store_true',
469 help='print results in JSON format')
470 args = parser.parse_args()
476 if debug_mode and json_mode:
477 sys.exit('[!] ERROR: options --debug and --json cannot be used simultaneously')
480 arch, msg = detect_arch(args.config)
482 sys.exit('[!] ERROR: {}'.format(msg))
484 print('[+] Detected architecture: {}'.format(arch))
486 construct_checklist(arch)
487 check_config_file(args.config)
488 error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), checklist)))
489 ok_count = len(list(filter(lambda opt: opt.result.startswith('OK'), checklist)))
493 print('[+] config check is finished: \'OK\' - {} / \'FAIL\' - {}'.format(ok_count, error_count))
498 construct_checklist(arch)