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48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
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FORMAT_VERSION = 2
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BLOB_REF_KEY = "__file"
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def is_safe_blob_path(path: str) -> bool:
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"""Reject path-traversal and absolute references inside the tar.
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Allows spaces, unicode, and any printable character — restrictions
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target structural attacks only:
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- rejects empty strings
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- rejects absolute paths (leading "/")
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- rejects ".." segments
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- rejects NUL byte (forbidden in tar)
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"""
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if not isinstance(path, str) or not path:
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return False
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if path.startswith("/"):
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return False
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if "\x00" in path:
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return False
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return ".." not in path.split("/")
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def norm_mount_prefix(prefix: str) -> str:
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"""Normalize mount prefix to '/x/' form.
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Registry stores mounts with leading + trailing slash. Users may
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pass '/m', '/m/', 'm/', or 'm' — all should match the same mount.
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"""
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s = prefix.strip("/")
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return "/" + s + "/" if s else "/"
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