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72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
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# -*- coding:utf-8 -*-
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#
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# Copyright (c) 2016 Rackspace, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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r"""
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===============================
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B506: Test for use of yaml load
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===============================
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This plugin test checks for the unsafe usage of the ``yaml.load`` function from
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the PyYAML package. The yaml.load function provides the ability to construct
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an arbitrary Python object, which may be dangerous if you receive a YAML
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document from an untrusted source. The function yaml.safe_load limits this
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ability to simple Python objects like integers or lists.
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Please see
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http://pyyaml.org/wiki/PyYAMLDocumentation#LoadingYAML for more information
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on ``yaml.load`` and yaml.safe_load
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:Example:
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>> Issue: [yaml_load] Use of unsafe yaml load. Allows instantiation of
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arbitrary objects. Consider yaml.safe_load().
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Severity: Medium Confidence: High
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Location: examples/yaml_load.py:5
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4 ystr = yaml.dump({'a' : 1, 'b' : 2, 'c' : 3})
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5 y = yaml.load(ystr)
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6 yaml.dump(y)
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.. seealso::
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- http://pyyaml.org/wiki/PyYAMLDocumentation#LoadingYAML
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.. versionadded:: 1.0.0
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"""
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import bandit
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from bandit.core import test_properties as test
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@test.test_id('B506')
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@test.checks('Call')
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def yaml_load(context):
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imported = context.is_module_imported_exact('yaml')
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qualname = context.call_function_name_qual
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if imported and isinstance(qualname, str):
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qualname_list = qualname.split('.')
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func = qualname_list[-1]
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if 'yaml' in qualname_list and func == 'load':
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if not context.check_call_arg_value('Loader', 'SafeLoader'):
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return bandit.Issue(
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severity=bandit.MEDIUM,
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confidence=bandit.HIGH,
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text="Use of unsafe yaml load. Allows instantiation of"
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" arbitrary objects. Consider yaml.safe_load().",
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lineno=context.node.lineno,
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)
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