print(f'[+] Config check is finished: \'OK\' - {ok_count}{ok_suppressed} / \'FAIL\' - {fail_count}{fail_suppressed}')
-def parse_kconfig_file(parsed_options, fname):
+def parse_kconfig_file(mode, parsed_options, fname):
with _open(fname, 'rt', encoding='utf-8') as f:
opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]+=.+$")
opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]+ is not set$")
option, value = line[2:].split(' ', 1)
assert(value == 'is not set'), \
f'unexpected value of disabled Kconfig option "{line}"'
- elif line != '' and not line.startswith('#'):
+ elif line != '' and not line.startswith('#') and mode != 'json':
print(f'[!] WARNING: strange line in Kconfig file: "{line}"')
if option in parsed_options:
- sys.exit(f'[!] ERROR: Kconfig option "{line}" exists multiple times')
+ sys.exit(f'[!] ERROR: Kconfig option "{line}" is found multiple times')
if option:
parsed_options[option] = value
-def parse_cmdline_file(parsed_options, fname):
+def parse_cmdline_file(mode, parsed_options, fname):
with open(fname, 'r', encoding='utf-8') as f:
line = f.readline()
opts = line.split()
else:
name = opt
value = '' # '' is not None
- if name in parsed_options:
- print(f'[!] WARNING: cmdline option "{name}" exists multiple times')
+ if name in parsed_options and mode != 'json':
+ print(f'[!] WARNING: cmdline option "{name}" is found multiple times')
value = normalize_cmdline_options(name, value)
parsed_options[name] = value
-def parse_sysctl_file(parsed_options, fname):
- print('parse_sysctl_file: TODO')
+def parse_sysctl_file(mode, parsed_options, fname):
+ with open(fname, 'r', encoding='utf-8') as f:
+ sysctl_pattern = re.compile("[a-zA-Z0-9\._-]+ =.*$")
+ for line in f.readlines():
+ line = line.strip()
+ if not sysctl_pattern.match(line):
+ sys.exit(f'[!] ERROR: unexpected line in sysctl file: {line}')
+ option, value = line.split('=', 1)
+ option = option.strip()
+ value = value.strip()
+ # sysctl options may be found multiple times, let's save the last value:
+ parsed_options[option] = value
+
+ # let's check the presence of some ancient sysctl option
+ # to ensure that we are parsing the output of `sudo sysctl -a > file`
+ if 'kernel.printk' not in parsed_options:
+ sys.exit(f'[!] ERROR: {fname} doesn\'t look like a sysctl output file, please try `sudo sysctl -a > {fname}`')
+
+ # let's check the presence of a sysctl option available for root
+ if 'net.core.bpf_jit_harden' not in parsed_options and mode != 'json':
+ print(f'[!] WARNING: sysctl option "net.core.bpf_jit_harden" available for root is not found in {fname}, please try `sudo sysctl -a > {fname}`')
def main():
help='check the security hardening options in the kernel Kconfig file (also supports *.gz files)')
parser.add_argument('-l', '--cmdline',
help='check the security hardening options in the kernel cmdline file (contents of /proc/cmdline)')
-# parser.add_argument('-s', '--sysctl',
-# help='check the security hardening options in the sysctl output file (`sudo sysctl -a > file`)')
+ parser.add_argument('-s', '--sysctl',
+ help='check the security hardening options in the sysctl output file (`sudo sysctl -a > file`)')
parser.add_argument('-p', '--print', choices=supported_archs,
help='print the security hardening recommendations for the selected microarchitecture')
parser.add_argument('-g', '--generate', choices=supported_archs,
help='generate a Kconfig fragment with the security hardening options for the selected microarchitecture')
args = parser.parse_args()
- args.sysctl = None # FIXME
mode = None
if args.mode:
if args.cmdline:
print(f'[+] Kernel cmdline file to check: {args.cmdline}')
if args.sysctl:
- print(f'[+] Kernel sysctl output file to check: {args.sysctl}')
+ print(f'[+] Sysctl output file to check: {args.sysctl}')
arch, msg = detect_arch(args.config, supported_archs)
if arch is None:
# populate the checklist with the parsed Kconfig data
parsed_kconfig_options = OrderedDict()
- parse_kconfig_file(parsed_kconfig_options, args.config)
+ parse_kconfig_file(mode, parsed_kconfig_options, args.config)
populate_with_data(config_checklist, parsed_kconfig_options, 'kconfig')
# populate the checklist with the kernel version data
if args.cmdline:
# populate the checklist with the parsed cmdline data
parsed_cmdline_options = OrderedDict()
- parse_cmdline_file(parsed_cmdline_options, args.cmdline)
+ parse_cmdline_file(mode, parsed_cmdline_options, args.cmdline)
populate_with_data(config_checklist, parsed_cmdline_options, 'cmdline')
if args.sysctl:
# populate the checklist with the parsed sysctl data
parsed_sysctl_options = OrderedDict()
- parse_sysctl_file(parsed_sysctl_options, args.sysctl)
+ parse_sysctl_file(mode, parsed_sysctl_options, args.sysctl)
populate_with_data(config_checklist, parsed_sysctl_options, 'sysctl')
# hackish refinement of the CONFIG_ARCH_MMAP_RND_BITS check
if args.print:
assert(args.config is None and args.cmdline is None and args.sysctl is None), 'unexpected args'
+ if args.generate:
+ sys.exit('[!] ERROR: --print and --generate can\'t be used together')
if mode and mode not in ('verbose', 'json'):
sys.exit(f'[!] ERROR: wrong mode "{mode}" for --print')
arch = args.print
sys.exit(0)
if args.generate:
- assert(args.config is None and args.cmdline is None and args.sysctl is None), 'unexpected args'
+ assert(args.config is None and args.cmdline is None and args.sysctl is None and args.print is None), 'unexpected args'
if mode:
sys.exit(f'[!] ERROR: wrong mode "{mode}" for --generate')
arch = args.generate
projects / kconfig-hardened-check.git / blobdiff