ENG-1640: Confine untrusted archive extraction under the destination root#3815
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…1640) Private ingredient wheels come from untrusted sources, so their extraction must not be able to write or point anywhere outside the destination directory. Unarchive now takes a WithUntrustedSource option. When set, every entry path, symlink target, and hardlink target is confined under the destination root and anything that would escape aborts extraction. It is off by default: trusted Platform artifacts may legitimately contain absolute symlinks (for example into /usr/share), so their extraction is unchanged. The ENG-1635 decrypt path will extract private wheels WithUntrustedSource; per- user isolation of decrypted content and the decrypt temp dir are handled there. testfile.tar.gz is a contained fixture backing the successful-extraction test; the previous fixture, which has a root-level escaping symlink, is renamed to testfile-escapes.tar.gz and backs the rejection test. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Test failures are known or sporadic and unrelated to this PR. |
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ENG-1640: Contain decrypted installs: path sanitization, private temps, user isolation
Part of the private ingredient work (ENG-1563). Private ingredient wheels come from untrusted sources, so their extraction must not be able to write or point anywhere outside the destination directory.
Unarchivenow takes aWithUntrustedSourceoption. When set, every entry path, symlink target, and hardlink target is confined under the destination root, and anything that escapes aborts extraction. It's off by default — trusted Platform artifacts may legitimately contain absolute symlinks (e.g. into/usr/share), so their extraction is unchanged. The decrypt-and-install path (ENG-1635) will extract private wheels with this option.Scope: just the extraction sanitizer. The decrypt temp dir and per-user isolation of decrypted content are deferred to ENG-1635, where they're applied at the deploy site.
Base branch: targets
mitchell/eng-1632(in review) so the diff is only this change; GitHub will retarget it toversion/0-48-1-RC2once the upstream PRs land.Tested with successful and rejected (untrusted) tar.gz fixtures, the same escaping archive extracting when trusted, a zip happy path, and contained symlink/hardlink extraction.
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