python: Straight port of tarslip#9551
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Also, remove the `toLowerCase` again, as I do not know what effect it will have.
python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll
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RasmusWL
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A few minor things, otherwise looks fine 👍
python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll
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| attr.getName() = "name" and | ||
| attr.getObject() = tarInfo | ||
| | | ||
| // Assume that any test with "path" in it is a sanitizer |
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| // Assume that any test with "path" in it is a sanitizer | |
| // Assume that any test ending with "path" in it is a sanitizer |
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I think it would match something like utilities.pathlib.filters.relative().
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nope, try for yourself with
from string s
where
s in ["ends_with_path", "path_foo"] and
s.matches("%path")
select sThere was a problem hiding this comment.
Ah, right. My example should have been utilities.path.filters.relative().
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Right, I'm still not 100% happy about the comment. I have two suggestions:
- change the comment entirely, so it reads something like
// the assumption that any test that matches%pathis a sanitizer might be too broad - make the comment more precise
After having written out (1), I'm very much in favor of that version, since I guess that is what highlights the intent behind the initial comment: that the sanitizer might be too broad.
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Right, that does seem more helpful.
python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll
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| override predicate checks(ControlFlowNode checked, boolean branch) { | ||
| checked = tarInfo and | ||
| branch in [true, false] |
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the old code only clears taint on the false edge. I don't see any mention of why this was changed, but the fact that our tests results did not change because of this, hints that our tests could have been better 😄
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True, I never got to write this down. I felt that the heuristic "contains path" did not warrant an assumption about whether the function tested for good or bad paths...
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I guess that's a fair point... although this doesn't make it a "straight port", I'll allow it 😊
python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll
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Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>
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Performance test looks slightly bad. It could be because I changed the guard. I will make it a straight port and run again.. |
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Besides a few minor things, looks good 👍
python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll
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| attr.getName() = "name" and | ||
| attr.getObject() = tarInfo | ||
| | | ||
| // Assume that any test with "path" in it is a sanitizer |
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Right, I'm still not 100% happy about the comment. I have two suggestions:
- change the comment entirely, so it reads something like
// the assumption that any test that matches%pathis a sanitizer might be too broad - make the comment more precise
After having written out (1), I'm very much in favor of that version, since I guess that is what highlights the intent behind the initial comment: that the sanitizer might be too broad.
…tions.qll Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>
Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>
RasmusWL
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LGTM (as long as newest performance test ends up looking good)
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Newest performance test is basically "nothing to report". |
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A straight port, which does not manually handle nested
not(since I think that is not the job of a query).I want to change the heuristic that any function with a name that contains
pathis a sanitizer..Flow states were not necessary.
I wonder if I should make it similar to the path injection query instead of how it is now. It depends on which sanitizers we would like to support.