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' ]
51 def __init__(self, name, expected, decision, reason):
53 self.expected = expected
54 self.decision = decision
60 if self.expected == self.state:
62 elif self.state is None:
63 if self.expected == 'is not set':
64 self.result = 'OK: not found'
66 self.result = 'FAIL: not found'
68 self.result = 'FAIL: "' + self.state + '"'
70 if self.result.startswith('OK'):
71 return True, self.result
73 return False, self.result
76 return '{} = {}'.format(self.name, self.state)
79 class ComplexOptCheck:
80 def __init__(self, *opts):
86 return self.opts[0].name
90 return self.opts[0].expected
94 return self.opts[0].state
98 return self.opts[0].decision
102 return self.opts[0].reason
105 class OR(ComplexOptCheck):
106 # self.opts[0] is the option which this OR-check is about.
108 # OR(<X_is_hardened>, <X_is_disabled>)
109 # OR(<X_is_hardened>, <X_is_hardened_old>)
113 sys.exit('[!] ERROR: invalid OR check')
115 for i, opt in enumerate(self.opts):
116 ret, msg = opt.check()
119 self.result = opt.result
121 self.result = 'OK: CONFIG_{} "{}"'.format(opt.name, opt.expected)
122 return True, self.result
123 self.result = self.opts[0].result
124 return False, self.result
127 class AND(ComplexOptCheck):
128 # self.opts[0] is the option which this AND-check is about.
129 # Use case: AND(<suboption>, <main_option>)
130 # Suboption is not checked if checking of the main_option is failed.
133 for i, opt in reversed(list(enumerate(self.opts))):
134 ret, msg = opt.check()
136 self.result = opt.result
137 return ret, self.result
139 self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name)
140 return False, self.result
142 sys.exit('[!] ERROR: invalid AND check')
145 def detect_arch(fname):
146 with open(fname, 'r') as f:
147 arch_pattern = re.compile("CONFIG_[a-zA-Z0-9_]*=y")
151 print('[+] Trying to detect architecture in "{}"...'.format(fname))
152 for line in f.readlines():
153 if arch_pattern.match(line):
154 option, value = line[7:].split('=', 1)
155 if option in supported_archs:
159 return None, 'more than one supported architecture is detected'
161 return None, 'failed to detect architecture'
166 def construct_checklist(checklist, arch):
167 modules_not_set = OptCheck('MODULES', 'is not set', 'kspp', 'cut_attack_surface')
168 devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCK_DOWN_KERNEL
170 checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection'))
171 checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \
172 OptCheck('DEBUG_RODATA', 'y', 'defconfig', 'self_protection'))) # before v4.11
173 checklist.append(OR(OptCheck('STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'), \
174 OptCheck('CC_STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection')))
175 checklist.append(OptCheck('SLUB_DEBUG', 'y', 'defconfig', 'self_protection'))
176 checklist.append(OR(OptCheck('STRICT_MODULE_RWX', 'y', 'defconfig', 'self_protection'), \
177 OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \
178 modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
179 if debug_mode or arch == 'X86_64':
180 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection'))
181 checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection'))
182 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
183 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection'))
184 checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection'))
185 checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection'))
186 checklist.append(OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection'))
187 checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason?
188 if debug_mode or arch == 'ARM64':
189 checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection'))
190 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
191 checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection'))
192 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
193 checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection'))
194 if debug_mode or arch == 'ARM':
195 checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'self_protection'))
196 checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection'))
197 if debug_mode or arch == 'ARM64' or arch == 'ARM':
198 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'))
200 checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection'))
201 checklist.append(OptCheck('DEBUG_WX', 'y', 'kspp', 'self_protection'))
202 checklist.append(OptCheck('SCHED_STACK_END_CHECK', 'y', 'kspp', 'self_protection'))
203 checklist.append(OptCheck('SLAB_FREELIST_HARDENED', 'y', 'kspp', 'self_protection'))
204 checklist.append(OptCheck('SLAB_FREELIST_RANDOM', 'y', 'kspp', 'self_protection'))
205 checklist.append(OptCheck('FORTIFY_SOURCE', 'y', 'kspp', 'self_protection'))
206 checklist.append(OptCheck('GCC_PLUGINS', 'y', 'kspp', 'self_protection'))
207 randstruct_is_set = OptCheck('GCC_PLUGIN_RANDSTRUCT', 'y', 'kspp', 'self_protection')
208 checklist.append(randstruct_is_set)
209 checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK', 'y', 'kspp', 'self_protection'))
210 checklist.append(OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection'))
211 checklist.append(OptCheck('GCC_PLUGIN_LATENT_ENTROPY', 'y', 'kspp', 'self_protection'))
212 checklist.append(OptCheck('DEBUG_LIST', 'y', 'kspp', 'self_protection'))
213 checklist.append(OptCheck('DEBUG_SG', 'y', 'kspp', 'self_protection'))
214 checklist.append(OptCheck('DEBUG_CREDENTIALS', 'y', 'kspp', 'self_protection'))
215 checklist.append(OptCheck('DEBUG_NOTIFIERS', 'y', 'kspp', 'self_protection'))
216 page_poisoning_is_set = OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')
217 checklist.append(page_poisoning_is_set)
218 hardened_usercopy_is_set = OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection')
219 checklist.append(hardened_usercopy_is_set)
220 checklist.append(AND(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection'), \
221 hardened_usercopy_is_set))
222 checklist.append(OR(OptCheck('MODULE_SIG', 'y', 'kspp', 'self_protection'), \
224 checklist.append(OR(OptCheck('MODULE_SIG_ALL', 'y', 'kspp', 'self_protection'), \
226 checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \
228 checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \
229 modules_not_set)) # refers to LOCK_DOWN_KERNEL
230 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
231 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection'))
232 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection'))
233 if debug_mode or arch == 'X86_32':
234 checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection'))
235 checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection'))
236 if debug_mode or arch == 'ARM64':
237 checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection'))
238 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'kspp', 'self_protection'))
239 if debug_mode or arch == 'ARM64' or arch == 'ARM':
240 checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason?
241 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection'))
243 checklist.append(OptCheck('LOCK_DOWN_KERNEL', 'y', 'clipos', 'self_protection')) # remember about LOCK_DOWN_MANDATORY
244 checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection'))
245 checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection'))
246 checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd)
247 checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge
248 checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \
250 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
251 stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection')
252 checklist.append(stackleak_is_set)
253 checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
255 checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE','is not set', 'clipos', 'self_protection'), \
257 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
258 checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection'))
259 checklist.append(OptCheck('MICROCODE', 'y', 'clipos', 'self_protection')) # is needed for mitigating CPU bugs
260 iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'clipos', 'self_protection') # is needed for mitigating DMA attacks
261 checklist.append(iommu_support_is_set)
262 checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'clipos', 'self_protection'), \
263 iommu_support_is_set))
264 checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \
265 iommu_support_is_set))
266 checklist.append(AND(OptCheck('INTEL_IOMMU_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
267 iommu_support_is_set))
269 if debug_mode or arch == 'X86_64':
270 checklist.append(AND(OptCheck('AMD_IOMMU', 'y', 'my', 'self_protection'), \
271 iommu_support_is_set))
272 checklist.append(AND(OptCheck('AMD_IOMMU_V2', 'y', 'my', 'self_protection'), \
273 iommu_support_is_set))
274 checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection'))
275 checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'self_protection')) # needs userspace support
276 checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd)
277 checklist.append(AND(OptCheck('PAGE_POISONING_NO_SANITY', 'is not set', 'my', 'self_protection'), \
278 page_poisoning_is_set))
279 checklist.append(AND(OptCheck('PAGE_POISONING_ZERO', 'is not set', 'my', 'self_protection'), \
280 page_poisoning_is_set))
281 if debug_mode or arch == 'X86_32':
282 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection'))
283 if debug_mode or arch == 'ARM':
284 checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'my', 'self_protection'))
286 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
287 checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) # and choose your favourite LSM
288 if debug_mode or arch == 'ARM':
289 checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) # and choose your favourite LSM
290 checklist.append(OptCheck('SECURITY_YAMA', 'y', 'kspp', 'security_policy'))
292 checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface'))
293 checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface'))
294 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
295 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \
296 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
298 checklist.append(modules_not_set)
299 checklist.append(devmem_not_set)
300 checklist.append(OR(OptCheck('IO_STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
301 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
302 if debug_mode or arch == 'ARM':
303 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
304 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
305 checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
306 checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface'))
307 checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface'))
308 checklist.append(OptCheck('COMPAT_VDSO', 'is not set', 'kspp', 'cut_attack_surface'))
309 checklist.append(OptCheck('BINFMT_MISC', 'is not set', 'kspp', 'cut_attack_surface'))
310 checklist.append(OptCheck('INET_DIAG', 'is not set', 'kspp', 'cut_attack_surface'))
311 checklist.append(OptCheck('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
312 checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
313 checklist.append(OptCheck('LEGACY_PTYS', 'is not set', 'kspp', 'cut_attack_surface'))
314 checklist.append(OptCheck('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
315 if debug_mode or arch == 'X86_64':
316 checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none'
317 checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface'))
318 checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface'))
319 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface'))
320 if debug_mode or arch == 'ARM':
321 checklist.append(OptCheck('OABI_COMPAT', 'is not set', 'kspp', 'cut_attack_surface'))
323 checklist.append(OptCheck('X86_PTDUMP', 'is not set', 'grsecurity', 'cut_attack_surface'))
324 checklist.append(OptCheck('ZSMALLOC_STAT', 'is not set', 'grsecurity', 'cut_attack_surface'))
325 checklist.append(OptCheck('PAGE_OWNER', 'is not set', 'grsecurity', 'cut_attack_surface'))
326 checklist.append(OptCheck('DEBUG_KMEMLEAK', 'is not set', 'grsecurity', 'cut_attack_surface'))
327 checklist.append(OptCheck('BINFMT_AOUT', 'is not set', 'grsecurity', 'cut_attack_surface'))
328 checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
329 checklist.append(OptCheck('UPROBES', 'is not set', 'grsecurity', 'cut_attack_surface'))
330 checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface'))
331 checklist.append(OptCheck('PROC_VMCORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
332 checklist.append(OptCheck('PROC_PAGE_MONITOR', 'is not set', 'grsecurity', 'cut_attack_surface'))
333 checklist.append(OptCheck('USELIB', 'is not set', 'grsecurity', 'cut_attack_surface'))
334 checklist.append(OptCheck('CHECKPOINT_RESTORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
335 checklist.append(OptCheck('USERFAULTFD', 'is not set', 'grsecurity', 'cut_attack_surface'))
336 checklist.append(OptCheck('HWPOISON_INJECT', 'is not set', 'grsecurity', 'cut_attack_surface'))
337 checklist.append(OptCheck('MEM_SOFT_DIRTY', 'is not set', 'grsecurity', 'cut_attack_surface'))
338 checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
339 checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
340 checklist.append(OptCheck('NOTIFIER_ERROR_INJECTION','is not set', 'grsecurity', 'cut_attack_surface'))
342 checklist.append(OptCheck('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
343 checklist.append(OptCheck('ACPI_APEI_EINJ', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
344 checklist.append(OptCheck('PROFILING', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
345 checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
346 checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
348 checklist.append(OptCheck('KSM', 'is not set', 'clipos', 'cut_attack_surface')) # to prevent FLUSH+RELOAD attack
349 checklist.append(OptCheck('IKCONFIG', 'is not set', 'clipos', 'cut_attack_surface'))
350 checklist.append(OptCheck('KALLSYMS', 'is not set', 'clipos', 'cut_attack_surface'))
351 checklist.append(OptCheck('X86_VSYSCALL_EMULATION', 'is not set', 'clipos', 'cut_attack_surface'))
352 checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface'))
353 checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
354 checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0
355 checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'))
357 checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
358 checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface'))
359 checklist.append(OptCheck('IP_DCCP', 'is not set', 'my', 'cut_attack_surface'))
360 checklist.append(OptCheck('IP_SCTP', 'is not set', 'my', 'cut_attack_surface'))
361 checklist.append(OptCheck('FTRACE', 'is not set', 'my', 'cut_attack_surface'))
362 checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface'))
363 if debug_mode or arch == 'X86_32':
364 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'my', 'cut_attack_surface'))
366 if debug_mode or arch == 'ARM64':
367 checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', 'userspace_protection'))
368 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
369 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'clipos', 'userspace_protection'))
370 if debug_mode or arch == 'X86_32' or arch == 'ARM':
371 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_protection'))
373 # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test'))
376 def print_checklist(checklist, with_results):
380 opt = ['CONFIG_'+o.name, o.expected, o.decision, o.reason]
388 print('{:^40}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
391 print('||{:^28}'.format('check result'), end='')
395 print('=' * sep_line_len)
397 for opt in checklist:
398 print('CONFIG_{:<33}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='')
400 print('||{:^28}'.format(opt.result), end='')
405 def get_option_state(options, name):
406 return options.get(name, None)
409 def perform_checks(checklist, parsed_options):
410 for opt in checklist:
411 if hasattr(opt, 'opts'):
413 o.state = get_option_state(parsed_options, o.name)
415 opt.state = get_option_state(parsed_options, opt.name)
419 def check_config_file(checklist, fname):
420 with open(fname, 'r') as f:
421 parsed_options = OrderedDict()
422 opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]*=[a-zA-Z0-9_\"]*")
423 opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]* is not set")
426 print('[+] Checking "{}" against hardening preferences...'.format(fname))
427 for line in f.readlines():
432 if opt_is_on.match(line):
433 option, value = line[7:].split('=', 1)
434 elif opt_is_off.match(line):
435 option, value = line[9:].split(' ', 1)
436 if value != 'is not set':
437 sys.exit('[!] ERROR: bad disabled config option "{}"'.format(line))
439 if option in parsed_options:
440 sys.exit('[!] ERROR: config option "{}" exists multiple times'.format(line))
442 if option is not None:
443 parsed_options[option] = value
445 perform_checks(checklist, parsed_options)
448 known_options = [opt.name for opt in checklist]
449 for option, value in parsed_options.items():
450 if option not in known_options:
451 print("DEBUG: dunno about option {} ({})".format(option, value))
453 print_checklist(checklist, True)
456 if __name__ == '__main__':
457 config_checklist = []
459 parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config')
460 parser.add_argument('-p', '--print', choices=supported_archs,
461 help='print hardening preferences for selected architecture')
462 parser.add_argument('-c', '--config',
463 help='check the config_file against these preferences')
464 parser.add_argument('--debug', action='store_true',
465 help='enable internal debug mode')
466 parser.add_argument('--json', action='store_true',
467 help='print results in JSON format')
468 args = parser.parse_args()
474 if debug_mode and json_mode:
475 sys.exit('[!] ERROR: options --debug and --json cannot be used simultaneously')
478 arch, msg = detect_arch(args.config)
480 sys.exit('[!] ERROR: {}'.format(msg))
482 print('[+] Detected architecture: {}'.format(arch))
484 construct_checklist(config_checklist, arch)
485 check_config_file(config_checklist, args.config)
486 error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), config_checklist)))
487 ok_count = len(list(filter(lambda opt: opt.result.startswith('OK'), config_checklist)))
491 print('[+] config check is finished: \'OK\' - {} / \'FAIL\' - {}'.format(ok_count, error_count))
496 construct_checklist(config_checklist, arch)
498 print('[+] Printing kernel hardening preferences for {}...'.format(arch))
499 print_checklist(config_checklist, False)