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Java: Track taint through java.io.File constructor and #toURI; URI#toURL #4457

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Oct 12, 2020
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Java: Track taint through java.io.File constructor and #toURI; URI#toURL #4457

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11 changes: 11 additions & 0 deletions java/ql/src/semmle/code/java/dataflow/internal/TaintTrackingUtil.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,11 @@ private predicate constructorStep(Expr tracked, ConstructorCall sink) {
or
//a URI constructed from a tainted string is tainted.
s = "java.net.URI" and argi = 0 and sink.getNumArgument() = 1
or
//a File constructed from a tainted string is tainted.
s = "java.io.File" and argi = 0
or
s = "java.io.File" and argi = 1
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)
or
exists(RefType t | t.getQualifiedName() = "java.lang.Number" |
Expand Down Expand Up @@ -372,6 +377,12 @@ private predicate taintPreservingQualifierToMethod(Method m) {
m.getDeclaringType().hasQualifiedName("java.nio", "ByteBuffer") and
m.hasName("get")
or
m.getDeclaringType().hasQualifiedName("java.io", "File") and
m.hasName("toURI")
or
m.getDeclaringType().hasQualifiedName("java.net", "URI") and
m.hasName("toURL")
or
m = any(GuiceProvider gp).getAnOverridingGetMethod()
or
m = any(ProtobufMessageLite p).getAGetterMethod()
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3 changes: 3 additions & 0 deletions java/ql/test/library-tests/dataflow/taint/B.java
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Expand Up @@ -129,6 +129,9 @@ public static void maintest() {
String[][][] taintedArray3 = new String[][][] { { { s } } };
sink(taintedArray3);

// Tainted file path and URI
sink(new java.io.File(s).toURI().toURL());

return;
}

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1 change: 1 addition & 0 deletions java/ql/test/library-tests/dataflow/taint/test.expected
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Expand Up @@ -33,6 +33,7 @@
| B.java:15:21:15:27 | taint(...) | B.java:126:10:126:21 | taintedArray |
| B.java:15:21:15:27 | taint(...) | B.java:128:10:128:22 | taintedArray2 |
| B.java:15:21:15:27 | taint(...) | B.java:130:10:130:22 | taintedArray3 |
| B.java:15:21:15:27 | taint(...) | B.java:133:10:133:44 | toURL(...) |
| MethodFlow.java:7:22:7:28 | taint(...) | MethodFlow.java:8:10:8:16 | tainted |
| MethodFlow.java:9:31:9:37 | taint(...) | MethodFlow.java:10:10:10:17 | tainted2 |
| MethodFlow.java:11:35:11:41 | taint(...) | MethodFlow.java:12:10:12:17 | tainted3 |
Expand Down