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false negative testing - before rewrite for variable dataflow

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This commit is contained in:
Jami Cogswell
2022-10-04 11:59:20 -04:00
parent 7d94590d79
commit 75794ec7a7
2 changed files with 34 additions and 3 deletions
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14
java/ql/lib/semmle/code/java/security/InsufficientKeySizeQuery.qll
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@@ -1,5 +1,6 @@
import semmle.code.java.security.Encryption
import semmle.code.java.dataflow.TaintTracking
import semmle.code.java.dataflow.DataFlow3
/** The Java class `java.security.spec.ECGenParameterSpec`. */
private class ECGenParameterSpec extends RefType {
@@ -86,9 +87,18 @@ private predicate hasShortSymmetricKey(MethodAccess ma, string msg, string type)
jcg.getAlgoSpec().(StringLiteral).getValue() = type and
source.getNode().asExpr() = jcg and
dest.getNode().asExpr() = ma.getQualifier() and
cc.hasFlowPath(source, dest)
//ma.getArgument(0) = var and // ! me
//var.getVariable().getInitializer().getUnderlyingExpr() instanceof IntegerLiteral and // ! me
cc.hasFlowPath(source, dest) //and
//var.getVariable().getInitializer().getUnderlyingExpr().toString().toInt() < 128 // ! me
) and
exists(VarAccess var |
var.getVariable().getInitializer().getUnderlyingExpr() instanceof IntegerLiteral and
var.getVariable().getInitializer().getUnderlyingExpr().toString().toInt() < 128 and
//DataFlow3::localExprFlow(var, ma.getArgument(0)) and
ma.getArgument(0) = var
//ma.getArgument(0).(IntegerLiteral).getIntValue() < 128
) and
ma.getArgument(0).(IntegerLiteral).getIntValue() < 128 and
msg = "Key size should be at least 128 bits for " + type + " encryption."
}