Add taint-tracking for mime/quotedprintable package.

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

@@ -14,6 +14,7 @@ import semmle.go.frameworks.stdlib.CompressLzw
 import semmle.go.frameworks.stdlib.CompressZlib
 import semmle.go.frameworks.stdlib.Mime
 import semmle.go.frameworks.stdlib.MimeMultipart
+import semmle.go.frameworks.stdlib.MimeQuotedprintable
 import semmle.go.frameworks.stdlib.Path
 import semmle.go.frameworks.stdlib.PathFilepath
 

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

@@ -0,0 +1,46 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `mime/quotedprintable` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `mime/quotedprintable` package. */
+module MimeQuotedprintable {
+  private class FunctionModels extends TaintTracking::FunctionModel {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    FunctionModels() {
+      // signature: func NewReader(r io.Reader) *Reader
+      hasQualifiedName("mime/quotedprintable", "NewReader") and
+      (inp.isParameter(0) and outp.isResult())
+      or
+      // signature: func NewWriter(w io.Writer) *Writer
+      hasQualifiedName("mime/quotedprintable", "NewWriter") and
+      (inp.isResult() and outp.isParameter(0))
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+
+  private class MethodModels extends TaintTracking::FunctionModel, Method {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    MethodModels() {
+      // signature: func (*Reader).Read(p []byte) (n int, err error)
+      this.hasQualifiedName("mime/quotedprintable", "Reader", "Read") and
+      (inp.isReceiver() and outp.isParameter(0))
+      or
+      // signature: func (*Writer).Write(p []byte) (n int, err error)
+      this.hasQualifiedName("mime/quotedprintable", "Writer", "Write") and
+      (inp.isParameter(0) and outp.isReceiver())
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}

ql/test/library-tests/semmle/go/frameworks/StdlibTaintFlow/MimeQuotedprintable.go

@@ -0,0 +1,59 @@
+// Code generated by https://github.com/gagliardetto/codebox. DO NOT EDIT.
+
+package main
+
+import (
+	"io"
+	"mime/quotedprintable"
+)
+
+func TaintStepTest_MimeQuotedprintableNewReader_B0I0O0(sourceCQL interface{}) interface{} {
+	fromReader656 := sourceCQL.(io.Reader)
+	intoReader414 := quotedprintable.NewReader(fromReader656)
+	return intoReader414
+}
+
+func TaintStepTest_MimeQuotedprintableNewWriter_B0I0O0(sourceCQL interface{}) interface{} {
+	fromWriter518 := sourceCQL.(*quotedprintable.Writer)
+	var intoWriter650 io.Writer
+	intermediateCQL := quotedprintable.NewWriter(intoWriter650)
+	link(fromWriter518, intermediateCQL)
+	return intoWriter650
+}
+
+func TaintStepTest_MimeQuotedprintableReaderRead_B0I0O0(sourceCQL interface{}) interface{} {
+	fromReader784 := sourceCQL.(quotedprintable.Reader)
+	var intoByte957 []byte
+	fromReader784.Read(intoByte957)
+	return intoByte957
+}
+
+func TaintStepTest_MimeQuotedprintableWriterWrite_B0I0O0(sourceCQL interface{}) interface{} {
+	fromByte520 := sourceCQL.([]byte)
+	var intoWriter443 quotedprintable.Writer
+	intoWriter443.Write(fromByte520)
+	return intoWriter443
+}
+
+func RunAllTaints_MimeQuotedprintable() {
+	{
+		source := newSource(0)
+		out := TaintStepTest_MimeQuotedprintableNewReader_B0I0O0(source)
+		sink(0, out)
+	}
+	{
+		source := newSource(1)
+		out := TaintStepTest_MimeQuotedprintableNewWriter_B0I0O0(source)
+		sink(1, out)
+	}
+	{
+		source := newSource(2)
+		out := TaintStepTest_MimeQuotedprintableReaderRead_B0I0O0(source)
+		sink(2, out)
+	}
+	{
+		source := newSource(3)
+		out := TaintStepTest_MimeQuotedprintableWriterWrite_B0I0O0(source)
+		sink(3, out)
+	}
+}