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Specify vulnerable args instead of safe ones

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This commit is contained in:
Owen Mansel-Chan
2026-01-30 14:10:03 +00:00
parent a3885cd8b2
commit 0222159df5
3 changed files with 19 additions and 11 deletions
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20
python/ql/lib/semmle/python/Concepts.qll
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@@ -118,10 +118,14 @@ class FileSystemAccess extends DataFlow::Node instanceof FileSystemAccess::Range
DataFlow::Node getAPathArgument() { result = super.getAPathArgument() }
/**
* Gets an argument to this file system access that is interpreted as a path,
* but which is not vulnerable to path injection.
* Gets an argument to this file system access that is interpreted as a path
* which is vulnerable to path injection.
*
* By default all path arguments are considered vulnerable, but this can be overridden to
* exclude certain arguments that are known to be safe, for example because they are
* restricted to a specific directory.
*/
DataFlow::Node getASafePathArgument() { result = super.getASafePathArgument() }
DataFlow::Node getAVulnerablePathArgument() { result = super.getAVulnerablePathArgument() }
}
/** Provides a class for modeling new file system access APIs. */
@@ -138,10 +142,14 @@ module FileSystemAccess {
abstract DataFlow::Node getAPathArgument();
/**
* Gets an argument to this file system access that is interpreted as a path,
* but which is not vulnerable to path injection.
* Gets an argument to this file system access that is interpreted as a path
* which is vulnerable to path injection.
*
* By default all path arguments are considered vulnerable, but this can be overridden to
* exclude certain arguments that are known to be safe, for example because they are
* restricted to a specific directory.
*/
DataFlow::Node getASafePathArgument() { none() }
DataFlow::Node getAVulnerablePathArgument() { result = this.getAPathArgument() }
}
}

7
python/ql/lib/semmle/python/frameworks/Flask.qll
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@@ -625,10 +625,11 @@ module Flask {
result = this.getArgByName(["directory", "filename"])
}
override DataFlow::Node getASafePathArgument() {
// as described in the docs, the `filename` argument is restrained to be within
override DataFlow::Node getAVulnerablePathArgument() {
result = this.getAPathArgument() and
// as described in the docs, the `filename` argument is restricted to be within
// the provided directory, so is not exposed to path-injection.
result in [this.getArg(1), this.getArgByName("filename")]
not result in [this.getArg(1), this.getArgByName("filename")]
}
}

3
python/ql/lib/semmle/python/security/dataflow/PathInjectionCustomizations.qll
View File

@@ -57,8 +57,7 @@ module PathInjection {
*/
class FileSystemAccessAsSink extends Sink {
FileSystemAccessAsSink() {
this = any(FileSystemAccess e).getAPathArgument() and
not this = any(FileSystemAccess e).getASafePathArgument() and
this = any(FileSystemAccess e).getAVulnerablePathArgument() and
// since implementation of Path.open in pathlib.py is like
// ```py
// def open(self, ...):