2021-10-26 21:41:14 +02:00
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import os
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2022-02-20 09:09:02 +01:00
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2023-07-09 12:38:03 +02:00
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class SuspiciousFileOperationError(Exception):
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2021-10-26 21:41:14 +02:00
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pass
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2022-02-20 09:09:02 +01:00
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2021-10-26 21:41:14 +02:00
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def path_traversal_check(unsafe_path, known_safe_path):
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known_safe_path = os.path.abspath(known_safe_path)
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unsafe_path = os.path.abspath(unsafe_path)
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if (os.path.commonprefix([known_safe_path, unsafe_path]) != known_safe_path):
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2023-07-09 12:38:03 +02:00
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raise SuspiciousFileOperationError(f"{unsafe_path} is not safe")
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2021-10-26 21:41:14 +02:00
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# Passes the check
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2023-07-09 12:38:03 +02:00
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return unsafe_path
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