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Added -L option to list built-in policies.

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This commit is contained in:
Joe Testa 2020-07-14 19:38:10 -04:00
parent b95969bbc0
commit 17f5eb0b38
1 changed files with 65 additions and 5 deletions
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70
ssh-audit.py
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@ -46,6 +46,7 @@ from typing import Callable, Optional, Union, Any
VERSION = 'v2.2.1-dev'
SSH_HEADER = 'SSH-{0}-OpenSSH_8.0' # SSH software to impersonate
GITHUB_ISSUES_URL = 'https://github.com/jtesta/ssh-audit/issues' # The URL to the Github issues tracker.
# The program return values corresponding to failure(s) encountered, warning(s) encountered, connection errors, and no problems found, respectively.
PROGRAM_RETVAL_FAILURE = 3
@ -67,7 +68,7 @@ def usage(err: Optional[str] = None) -> None:
uout.head('# {} {}, https://github.com/jtesta/ssh-audit\n'.format(p, VERSION))
if err is not None and len(err) > 0:
uout.fail('\n' + err)
uout.info('usage: {0} [-h1246ptbcPjlnv] <host>\n'.format(p))
uout.info('usage: {0} [-h1246ptbcMPjlLnv] <host>\n'.format(p))
uout.info(' -h, --help print this help')
uout.info(' -1, --ssh1 force ssh version 1 only')
uout.info(' -2, --ssh2 force ssh version 2 only')
@ -84,6 +85,7 @@ def usage(err: Optional[str] = None) -> None:
uout.info('')
uout.info(' -j, --json JSON output')
uout.info(' -l, --level=<level> minimum output level (info|warn|fail)')
uout.info(' -L, --list-policies list all the official, built-in policies')
uout.info(' -n, --no-colors disable colors')
uout.info(' -v, --verbose verbose output')
uout.sep()
@ -421,10 +423,11 @@ class AuditConf:
self.timeout_set = False # Set to True when the user explicitly sets it.
self.target_file = None # type: Optional[str]
self.target_list = [] # type: List[str]
self.list_policies = False
def __setattr__(self, name: str, value: Union[str, int, float, bool, Sequence[int]]) -> None:
valid = False
if name in ['ssh1', 'ssh2', 'batch', 'client_audit', 'colors', 'verbose', 'timeout_set', 'json', 'make_policy']:
if name in ['ssh1', 'ssh2', 'batch', 'client_audit', 'colors', 'verbose', 'timeout_set', 'json', 'make_policy', 'list_policies']:
valid, value = True, bool(value)
elif name in ['ipv4', 'ipv6']:
valid = False
@ -473,8 +476,8 @@ class AuditConf:
# pylint: disable=too-many-branches
aconf = cls()
try:
sopts = 'h1246M:p:P:jbcnvl:t:T:'
lopts = ['help', 'ssh1', 'ssh2', 'ipv4', 'ipv6', 'make-policy=', 'port=', 'policy=', 'json', 'batch', 'client-audit', 'no-colors', 'verbose', 'level=', 'timeout=', 'targets=']
sopts = 'h1246M:p:P:jbcnvl:t:T:L'
lopts = ['help', 'ssh1', 'ssh2', 'ipv4', 'ipv6', 'make-policy=', 'port=', 'policy=', 'json', 'batch', 'client-audit', 'no-colors', 'verbose', 'level=', 'timeout=', 'targets=', 'list-policies']
opts, args = getopt.gnu_getopt(args, sopts, lopts)
except getopt.GetoptError as err:
usage_cb(str(err))
@ -520,10 +523,16 @@ class AuditConf:
aconf.policy_file = a
elif o in ('-T', '--targets'):
aconf.target_file = a
elif o in ('-L', '--list-policies'):
aconf.list_policies = True
if len(args) == 0 and aconf.client_audit is False and aconf.target_file is None:
if len(args) == 0 and aconf.client_audit is False and aconf.target_file is None and aconf.list_policies is False:
usage_cb()
if aconf.list_policies:
list_policies()
sys.exit(PROGRAM_RETVAL_GOOD)
if aconf.client_audit is False and aconf.target_file is None:
if oport is not None:
host = args[0]
@ -3282,6 +3291,57 @@ def evaluate_policy(aconf: AuditConf, banner: Optional['SSH.Banner'], client_hos
return passed
def list_policies() -> None:
# Get a list of all the files in the policies sub-directory, relative to the path of this script.
installed_dir = os.path.dirname(os.path.abspath(__file__))
policies_dir = os.path.join(installed_dir, 'policies')
# If the path is not a directory, print a useful error and exit.
if not os.path.isdir(policies_dir):
print("Error: could not find policies directory. Please report this full output to <%s>:" % GITHUB_ISSUES_URL)
print("\n__file__: %s" % __file__)
print("policies_dir: %s" % policies_dir)
sys.exit(PROGRAM_RETVAL_UNKNOWN_ERROR)
# Get a list of all the files in the policies sub-directory.
files = []
for f in os.listdir(policies_dir):
files.append(f)
files.sort() # Now the files will be in order, like 'ubuntu_client_16_04.txt', 'ubuntu_client_18_04.txt', 'ubuntu_client_20_04.txt', ...
server_policies_summary = []
client_policies_summary = []
for f in files:
# Load each policy, and generate a short summary from its name and absolute file path.
policy_file = os.path.join(policies_dir, f)
policy = Policy(policy_file=policy_file)
policy_summary = "Name: %s\nPolicy path: %s" % (policy.get_name_and_version(), policy_file)
# We will print the server policies separately from thee client policies...
if policy.is_server_policy():
server_policies_summary.append(policy_summary)
else:
client_policies_summary.append(policy_summary)
if len(server_policies_summary) > 0:
out.head('\nServer policies:\n')
print("\n\n".join(server_policies_summary))
print()
if len(client_policies_summary) > 0:
out.head('\nClient policies:\n')
print("\n\n".join(client_policies_summary))
print()
if len(server_policies_summary) == 0 and len(client_policies_summary) == 0:
print("Error: no built-in policies found in %s." % policies_dir)
else:
print("\nHint: Use -P and provide the path to a policy to run a policy scan.\n")
def make_policy(aconf: AuditConf, banner: Optional['SSH.Banner'], kex: Optional['SSH2.Kex'], client_host: Optional[str]) -> None:
# Set the source of this policy to the server host if this is a server audit, otherwise set it to the client address.