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main.py
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main.py
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# -*- coding:utf-8 -*-
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# SPDX-License-Identifier: Apache-2.0
"""Bandit is a tool designed to find common security issues in Python code."""
import argparse
import fnmatch
import logging
import os
import sys
import textwrap
import bandit
from bandit.core import config as b_config
from bandit.core import constants
from bandit.core import manager as b_manager
from bandit.core import utils
BASE_CONFIG = 'bandit.yaml'
LOG = logging.getLogger()
def _init_logger(log_level=logging.INFO, log_format=None):
"""Initialize the logger.
:param debug: Whether to enable debug mode
:return: An instantiated logging instance
"""
LOG.handlers = []
if not log_format:
# default log format
log_format_string = constants.log_format_string
else:
log_format_string = log_format
logging.captureWarnings(True)
LOG.setLevel(log_level)
handler = logging.StreamHandler(sys.stderr)
handler.setFormatter(logging.Formatter(log_format_string))
LOG.addHandler(handler)
LOG.debug("logging initialized")
def _get_options_from_ini(ini_path, target):
"""Return a dictionary of config options or None if we can't load any."""
ini_file = None
if ini_path:
ini_file = ini_path
else:
bandit_files = []
for t in target:
for root, _, filenames in os.walk(t):
for filename in fnmatch.filter(filenames, '.bandit'):
bandit_files.append(os.path.join(root, filename))
if len(bandit_files) > 1:
LOG.error('Multiple .bandit files found - scan separately or '
'choose one with --ini\n\t%s', ', '.join(bandit_files))
sys.exit(2)
elif len(bandit_files) == 1:
ini_file = bandit_files[0]
LOG.info('Found project level .bandit file: %s', bandit_files[0])
if ini_file:
return utils.parse_ini_file(ini_file)
else:
return None
def _init_extensions():
from bandit.core import extension_loader as ext_loader
return ext_loader.MANAGER
def _log_option_source(default_val, arg_val, ini_val, option_name):
"""It's useful to show the source of each option."""
# When default value is not defined, arg_val and ini_val is deterministic
if default_val is None:
if arg_val:
LOG.info("Using command line arg for %s", option_name)
return arg_val
elif ini_val:
LOG.info("Using ini file for %s", option_name)
return ini_val
else:
return None
# No value passed to commad line and default value is used
elif default_val == arg_val:
return ini_val if ini_val else arg_val
# Certainly a value is passed to commad line
else:
return arg_val
def _running_under_virtualenv():
if hasattr(sys, 'real_prefix'):
return True
elif sys.prefix != getattr(sys, 'base_prefix', sys.prefix):
return True
def _get_profile(config, profile_name, config_path):
profile = {}
if profile_name:
profiles = config.get_option('profiles') or {}
profile = profiles.get(profile_name)
if profile is None:
raise utils.ProfileNotFound(config_path, profile_name)
LOG.debug("read in legacy profile '%s': %s", profile_name, profile)
else:
profile['include'] = set(config.get_option('tests') or [])
profile['exclude'] = set(config.get_option('skips') or [])
return profile
def _log_info(args, profile):
inc = ",".join([t for t in profile['include']]) or "None"
exc = ",".join([t for t in profile['exclude']]) or "None"
LOG.info("profile include tests: %s", inc)
LOG.info("profile exclude tests: %s", exc)
LOG.info("cli include tests: %s", args.tests)
LOG.info("cli exclude tests: %s", args.skips)
def main():
"""Bandit CLI."""
# bring our logging stuff up as early as possible
debug = (logging.DEBUG if '-d' in sys.argv or '--debug' in sys.argv else
logging.INFO)
_init_logger(debug)
extension_mgr = _init_extensions()
baseline_formatters = [f.name for f in filter(lambda x:
hasattr(x.plugin,
'_accepts_baseline'),
extension_mgr.formatters)]
# now do normal startup
parser = argparse.ArgumentParser(
description='Bandit - a Python source code security analyzer',
formatter_class=argparse.RawDescriptionHelpFormatter
)
parser.add_argument(
'targets', metavar='targets', type=str, nargs='*',
help='source file(s) or directory(s) to be tested'
)
parser.add_argument(
'-r', '--recursive', dest='recursive',
action='store_true', help='find and process files in subdirectories'
)
parser.add_argument(
'-a', '--aggregate', dest='agg_type',
action='store', default='file', type=str,
choices=['file', 'vuln'],
help='aggregate output by vulnerability (default) or by filename'
)
parser.add_argument(
'-n', '--number', dest='context_lines',
action='store', default=3, type=int,
help='maximum number of code lines to output for each issue'
)
parser.add_argument(
'-c', '--configfile', dest='config_file',
action='store', default=None, type=str,
help='optional config file to use for selecting plugins and '
'overriding defaults'
)
parser.add_argument(
'-p', '--profile', dest='profile',
action='store', default=None, type=str,
help='profile to use (defaults to executing all tests)'
)
parser.add_argument(
'-t', '--tests', dest='tests',
action='store', default=None, type=str,
help='comma-separated list of test IDs to run'
)
parser.add_argument(
'-s', '--skip', dest='skips',
action='store', default=None, type=str,
help='comma-separated list of test IDs to skip'
)
severity_group = parser.add_mutually_exclusive_group(required=False)
severity_group.add_argument(
'-l', '--level', dest='severity', action='count',
default=1, help='report only issues of a given severity level or '
'higher (-l for LOW, -ll for MEDIUM, -lll for HIGH)'
)
severity_group.add_argument(
'--severity-level', dest='severity_string', action='store',
help='report only issues of a given severity level or higher.'
' "all" and "low" are likely to produce the same results, but it'
' is possible for rules to be undefined which will'
' not be listed in "low".',
choices=['all', 'low', 'medium', 'high']
)
confidence_group = parser.add_mutually_exclusive_group(required=False)
confidence_group.add_argument(
'-i', '--confidence', dest='confidence', action='count',
default=1, help='report only issues of a given confidence level or '
'higher (-i for LOW, -ii for MEDIUM, -iii for HIGH)'
)
confidence_group.add_argument(
'--confidence-level', dest='confidence_string', action='store',
help='report only issues of a given confidence level or higher.'
' "all" and "low" are likely to produce the same results, but it'
' is possible for rules to be undefined which will'
' not be listed in "low".',
choices=["all", "low", "medium", "high"]
)
output_format = 'screen' if sys.stdout.isatty() else 'txt'
parser.add_argument(
'-f', '--format', dest='output_format', action='store',
default=output_format, help='specify output format',
choices=sorted(extension_mgr.formatter_names)
)
parser.add_argument(
'--msg-template', action='store',
default=None, help='specify output message template'
' (only usable with --format custom),'
' see CUSTOM FORMAT section'
' for list of available values',
)
parser.add_argument(
'-o', '--output', dest='output_file', action='store', nargs='?',
type=argparse.FileType('w', encoding='utf-8'), default=sys.stdout,
help='write report to filename'
)
group = parser.add_mutually_exclusive_group(required=False)
group.add_argument(
'-v', '--verbose', dest='verbose', action='store_true',
help='output extra information like excluded and included files'
)
parser.add_argument(
'-d', '--debug', dest='debug', action='store_true',
help='turn on debug mode'
)
group.add_argument(
'-q', '--quiet', '--silent', dest='quiet', action='store_true',
help='only show output in the case of an error'
)
parser.add_argument(
'--ignore-nosec', dest='ignore_nosec', action='store_true',
help='do not skip lines with # nosec comments'
)
parser.add_argument(
'-x', '--exclude', dest='excluded_paths', action='store',
default=','.join(constants.EXCLUDE),
help='comma-separated list of paths (glob patterns '
'supported) to exclude from scan '
'(note that these are in addition to the excluded '
'paths provided in the config file) (default: ' +
','.join(constants.EXCLUDE) + ')'
)
parser.add_argument(
'-b', '--baseline', dest='baseline', action='store',
default=None, help='path of a baseline report to compare against '
'(only JSON-formatted files are accepted)'
)
parser.add_argument(
'--ini', dest='ini_path', action='store', default=None,
help='path to a .bandit file that supplies command line arguments'
)
parser.add_argument('--exit-zero', action='store_true', dest='exit_zero',
default=False, help='exit with 0, '
'even with results found')
python_ver = sys.version.replace('\n', '')
parser.add_argument(
'--version', action='version',
version='%(prog)s {version}\n python version = {python}'.format(
version=bandit.__version__, python=python_ver)
)
parser.set_defaults(debug=False)
parser.set_defaults(verbose=False)
parser.set_defaults(quiet=False)
parser.set_defaults(ignore_nosec=False)
plugin_info = ["%s\t%s" % (a[0], a[1].name) for a in
extension_mgr.plugins_by_id.items()]
blacklist_info = []
for a in extension_mgr.blacklist.items():
for b in a[1]:
blacklist_info.append('%s\t%s' % (b['id'], b['name']))
plugin_list = '\n\t'.join(sorted(set(plugin_info + blacklist_info)))
dedent_text = textwrap.dedent('''
CUSTOM FORMATTING
-----------------
Available tags:
{abspath}, {relpath}, {line}, {col}, {test_id},
{severity}, {msg}, {confidence}, {range}
Example usage:
Default template:
bandit -r examples/ --format custom --msg-template \\
"{abspath}:{line}: {test_id}[bandit]: {severity}: {msg}"
Provides same output as:
bandit -r examples/ --format custom
Tags can also be formatted in python string.format() style:
bandit -r examples/ --format custom --msg-template \\
"{relpath:20.20s}: {line:03}: {test_id:^8}: DEFECT: {msg:>20}"
See python documentation for more information about formatting style:
https://docs.python.org/3/library/string.html
The following tests were discovered and loaded:
-----------------------------------------------
''')
parser.epilog = dedent_text + "\t{0}".format(plugin_list)
# setup work - parse arguments, and initialize BanditManager
args = parser.parse_args()
# Check if `--msg-template` is not present without custom formatter
if args.output_format != 'custom' and args.msg_template is not None:
parser.error("--msg-template can only be used with --format=custom")
# Check if confidence or severity level have been specified with strings
if args.severity_string is not None:
if args.severity_string == "all":
args.severity = 1
elif args.severity_string == "low":
args.severity = 2
elif args.severity_string == "medium":
args.severity = 3
elif args.severity_string == "high":
args.severity = 4
# Other strings will be blocked by argparse
if args.confidence_string is not None:
if args.confidence_string == "all":
args.confidence = 1
elif args.confidence_string == "low":
args.confidence = 2
elif args.confidence_string == "medium":
args.confidence = 3
elif args.confidence_string == "high":
args.confidence = 4
# Other strings will be blocked by argparse
try:
b_conf = b_config.BanditConfig(config_file=args.config_file)
except utils.ConfigError as e:
LOG.error(e)
sys.exit(2)
# Handle .bandit files in projects to pass cmdline args from file
ini_options = _get_options_from_ini(args.ini_path, args.targets)
if ini_options:
# prefer command line, then ini file
args.excluded_paths = _log_option_source(
parser.get_default('excluded_paths'),
args.excluded_paths,
ini_options.get('exclude'),
'excluded paths')
args.skips = _log_option_source(
parser.get_default('skips'),
args.skips,
ini_options.get('skips'),
'skipped tests')
args.tests = _log_option_source(
parser.get_default('tests'),
args.tests,
ini_options.get('tests'),
'selected tests')
ini_targets = ini_options.get('targets')
if ini_targets:
ini_targets = ini_targets.split(',')
args.targets = _log_option_source(
parser.get_default('targets'),
args.targets,
ini_targets,
'selected targets')
# TODO(tmcpeak): any other useful options to pass from .bandit?
args.recursive = _log_option_source(
parser.get_default('recursive'),
args.recursive,
ini_options.get('recursive'),
'recursive scan')
args.agg_type = _log_option_source(
parser.get_default('agg_type'),
args.agg_type,
ini_options.get('aggregate'),
'aggregate output type')
args.context_lines = _log_option_source(
parser.get_default('context_lines'),
args.context_lines,
ini_options.get('number'),
'max code lines output for issue')
args.profile = _log_option_source(
parser.get_default('profile'),
args.profile,
ini_options.get('profile'),
'profile')
args.severity = _log_option_source(
parser.get_default('severity'),
args.severity,
ini_options.get('level'),
'severity level')
args.confidence = _log_option_source(
parser.get_default('confidence'),
args.confidence,
ini_options.get('confidence'),
'confidence level')
args.output_format = _log_option_source(
parser.get_default('output_format'),
args.output_format,
ini_options.get('format'),
'output format')
args.msg_template = _log_option_source(
parser.get_default('msg_template'),
args.msg_template,
ini_options.get('msg-template'),
'output message template')
args.output_file = _log_option_source(
parser.get_default('output_file'),
args.output_file,
ini_options.get('output'),
'output file')
args.verbose = _log_option_source(
parser.get_default('verbose'),
args.verbose,
ini_options.get('verbose'),
'output extra information')
args.debug = _log_option_source(
parser.get_default('debug'),
args.debug,
ini_options.get('debug'),
'debug mode')
args.quiet = _log_option_source(
parser.get_default('quiet'),
args.quiet,
ini_options.get('quiet'),
'silent mode')
args.ignore_nosec = _log_option_source(
parser.get_default('ignore_nosec'),
args.ignore_nosec,
ini_options.get('ignore-nosec'),
'do not skip lines with # nosec')
args.baseline = _log_option_source(
parser.get_default('baseline'),
args.baseline,
ini_options.get('baseline'),
'path of a baseline report')
if not args.targets:
LOG.error("No targets found in CLI or ini files, exiting.")
sys.exit(2)
# if the log format string was set in the options, reinitialize
if b_conf.get_option('log_format'):
log_format = b_conf.get_option('log_format')
_init_logger(log_level=logging.DEBUG, log_format=log_format)
if args.quiet:
_init_logger(log_level=logging.WARN)
try:
profile = _get_profile(b_conf, args.profile, args.config_file)
_log_info(args, profile)
profile['include'].update(args.tests.split(',') if args.tests else [])
profile['exclude'].update(args.skips.split(',') if args.skips else [])
extension_mgr.validate_profile(profile)
except (utils.ProfileNotFound, ValueError) as e:
LOG.error(e)
sys.exit(2)
b_mgr = b_manager.BanditManager(b_conf, args.agg_type, args.debug,
profile=profile, verbose=args.verbose,
quiet=args.quiet,
ignore_nosec=args.ignore_nosec)
if args.baseline is not None:
try:
with open(args.baseline) as bl:
data = bl.read()
b_mgr.populate_baseline(data)
except IOError:
LOG.warning("Could not open baseline report: %s", args.baseline)
sys.exit(2)
if args.output_format not in baseline_formatters:
LOG.warning('Baseline must be used with one of the following '
'formats: ' + str(baseline_formatters))
sys.exit(2)
if args.output_format != "json":
if args.config_file:
LOG.info("using config: %s", args.config_file)
LOG.info("running on Python %d.%d.%d", sys.version_info.major,
sys.version_info.minor, sys.version_info.micro)
# initiate file discovery step within Bandit Manager
b_mgr.discover_files(args.targets, args.recursive, args.excluded_paths)
if not b_mgr.b_ts.tests:
LOG.error('No tests would be run, please check the profile.')
sys.exit(2)
# initiate execution of tests within Bandit Manager
b_mgr.run_tests()
LOG.debug(b_mgr.b_ma)
LOG.debug(b_mgr.metrics)
# trigger output of results by Bandit Manager
sev_level = constants.RANKING[args.severity - 1]
conf_level = constants.RANKING[args.confidence - 1]
b_mgr.output_results(args.context_lines,
sev_level,
conf_level,
args.output_file,
args.output_format,
args.msg_template)
if (b_mgr.results_count(sev_filter=sev_level, conf_filter=conf_level) > 0
and not args.exit_zero):
sys.exit(1)
else:
sys.exit(0)
if __name__ == '__main__':
main()