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Fix hang when scanning a Java resource adapter (.rar) file (#5348)

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* fix: scan a Java resource adapter (.rar) given as a file source

The file source picks an extractor for the scan target from its file name
alone. A Java resource adapter archive (JCA) uses the .rar extension but is
a zip file, so it was handed to the RAR extractor. With rardecode v2.2.0 the
RAR extractor does not return on non-RAR input (an infinite loop in its
signature search), so `syft scan --from file adapter.rar` never finished.
The same bytes named .jar scan in under a second.

When the name says RAR but the content is a zip archive, leave the file
unextracted, the same way .jar, .war and .ear scan targets are handled. The
java cataloger already reads .rar files (anchore/syft#4136) and now finds the
resource adapter and its nested jars. Real RAR archives are still extracted.

Signed-off-by: Ismael Donmez <ismael.donmez@chainguard.dev>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* chore(deps): bump github.com/nwaples/rardecode/v2 from 2.2.0 to 2.4.1

rardecode v2.2.0 loops forever in its RAR signature search when the input
does not start with a RAR signature (fixed upstream in nwaples/rardecode
f501ac8, "fix infinite loop in findSig", released in v2.2.2). syft reaches
that search for any file source whose name contains ".rar", so a scan of a
self-extracting RAR, or of any other file with such a name, never finished.
With v2.4.1 a self-extracting RAR is extracted, and a file that is not a RAR
archive fails fast with "rardecode: RAR signature not found", the same way a
file named .zip that is not a zip archive fails today.

github.com/mholt/archives v0.1.5 (the latest release) still requires v2.2.0,
so the newer version is selected here.

Signed-off-by: Ismael Donmez <ismael.donmez@chainguard.dev>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* fix: clarify the .rar zip log line and cover self-extracting RAR sources

- the debug line no longer calls every `.rar`-named zip a resource adapter
- a self-extracting RAR (stub before the signature) given as a file source is
  still extracted

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Ismael Donmez <ismael.donmez@chainguard.dev>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>
This commit is contained in:
Ismael Dönmez
2026-09-30 15:54:36 +00:00
committed by GitHub
co-authored by Claude Opus 5.5 Alex Goodman
parent f21e439a63
commit 0bbcff1ae3
6 changed files with 201 additions and 3 deletions
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@@ -758,8 +758,8 @@ github.com/nix-community/go-nix v0.0.0-20250101154619-4bdde671e0a1 h1:kpt9ZfKcm+
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github.com/nsf/jsondiff v0.0.0-20210926074059-1e845ec5d249/go.mod h1:mpRZBD8SJ55OIICQ3iWH0Yz3cjzA61JdqMLoWXeB2+8=
github.com/nwaples/rardecode/v2 v2.2.0 h1:4ufPGHiNe1rYJxYfehALLjup4Ls3ck42CWwjKiOqu0A=
github.com/nwaples/rardecode/v2 v2.2.0/go.mod h1:7uz379lSxPe6j9nvzxUZ+n7mnJNgjsRNb6IbvGVHRmw=
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github.com/olekukonko/errors v1.2.0 h1:10Zcn4GeV59t/EGqJc8fUjtFT/FuUh5bTMzZ1XwmCRo=