Add taint-tracking for encoding/binary

Author: gagliardetto

ql/src/semmle/go/frameworks/Stdlib.qll

@@ -20,6 +20,7 @@ import semmle.go.frameworks.stdlib.EncodingAscii85
 import semmle.go.frameworks.stdlib.EncodingAsn1
 import semmle.go.frameworks.stdlib.EncodingBase32
 import semmle.go.frameworks.stdlib.EncodingBase64
+import semmle.go.frameworks.stdlib.EncodingBinary
 import semmle.go.frameworks.stdlib.Path
 import semmle.go.frameworks.stdlib.PathFilepath
 import semmle.go.frameworks.stdlib.Reflect

ql/src/semmle/go/frameworks/stdlib/EncodingBinary.qll

@@ -0,0 +1,27 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `encoding/binary` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `encoding/binary` package. */
+module EncodingBinary {
+  private class FunctionModels extends TaintTracking::FunctionModel {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    FunctionModels() {
+      // signature: func Read(r io.Reader, order ByteOrder, data interface{}) error
+      hasQualifiedName("encoding/binary", "Read") and
+      (inp.isParameter(0) and outp.isParameter(2))
+      or
+      // signature: func Write(w io.Writer, order ByteOrder, data interface{}) error
+      hasQualifiedName("encoding/binary", "Write") and
+      (inp.isParameter(2) and outp.isParameter(0))
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}