Add taint-tracking for mime package.

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

@@ -12,6 +12,7 @@ import semmle.go.frameworks.stdlib.CompressFlate
 import semmle.go.frameworks.stdlib.CompressGzip
 import semmle.go.frameworks.stdlib.CompressLzw
 import semmle.go.frameworks.stdlib.CompressZlib
+import semmle.go.frameworks.stdlib.Mime
 import semmle.go.frameworks.stdlib.Path
 import semmle.go.frameworks.stdlib.PathFilepath
 

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

@@ -0,0 +1,50 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `mime` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `mime` package. */
+module Mime {
+  private class FunctionModels extends TaintTracking::FunctionModel {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    FunctionModels() {
+      // signature: func FormatMediaType(t string, param map[string]string) string
+      hasQualifiedName("mime", "FormatMediaType") and
+      (inp.isParameter(_) and outp.isResult())
+      or
+      // signature: func ParseMediaType(v string) (mediatype string, params map[string]string, err error)
+      hasQualifiedName("mime", "ParseMediaType") and
+      (inp.isParameter(0) and outp.isResult([0, 1]))
+    }
+
+    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 (*WordDecoder).Decode(word string) (string, error)
+      this.hasQualifiedName("mime", "WordDecoder", "Decode") and
+      (inp.isParameter(0) and outp.isResult(0))
+      or
+      // signature: func (*WordDecoder).DecodeHeader(header string) (string, error)
+      this.hasQualifiedName("mime", "WordDecoder", "DecodeHeader") and
+      (inp.isParameter(0) and outp.isResult(0))
+      or
+      // signature: func (WordEncoder).Encode(charset string, s string) string
+      this.hasQualifiedName("mime", "WordEncoder", "Encode") and
+      (inp.isParameter(1) and outp.isResult())
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}

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

@@ -0,0 +1,88 @@
+// Code generated by https://github.com/gagliardetto/codebox. DO NOT EDIT.
+
+package main
+
+import "mime"
+
+func TaintStepTest_MimeFormatMediaType_B0I0O0(sourceCQL interface{}) interface{} {
+	fromString656 := sourceCQL.(string)
+	intoString414 := mime.FormatMediaType(fromString656, nil)
+	return intoString414
+}
+
+func TaintStepTest_MimeFormatMediaType_B0I1O0(sourceCQL interface{}) interface{} {
+	fromMapstringstring518 := sourceCQL.(map[string]string)
+	intoString650 := mime.FormatMediaType("", fromMapstringstring518)
+	return intoString650
+}
+
+func TaintStepTest_MimeParseMediaType_B0I0O0(sourceCQL interface{}) interface{} {
+	fromString784 := sourceCQL.(string)
+	intoString957, _, _ := mime.ParseMediaType(fromString784)
+	return intoString957
+}
+
+func TaintStepTest_MimeParseMediaType_B0I0O1(sourceCQL interface{}) interface{} {
+	fromString520 := sourceCQL.(string)
+	_, intoMapstringstring443, _ := mime.ParseMediaType(fromString520)
+	return intoMapstringstring443
+}
+
+func TaintStepTest_MimeWordDecoderDecode_B0I0O0(sourceCQL interface{}) interface{} {
+	fromString127 := sourceCQL.(string)
+	var mediumObjCQL mime.WordDecoder
+	intoString483, _ := mediumObjCQL.Decode(fromString127)
+	return intoString483
+}
+
+func TaintStepTest_MimeWordDecoderDecodeHeader_B0I0O0(sourceCQL interface{}) interface{} {
+	fromString989 := sourceCQL.(string)
+	var mediumObjCQL mime.WordDecoder
+	intoString982, _ := mediumObjCQL.DecodeHeader(fromString989)
+	return intoString982
+}
+
+func TaintStepTest_MimeWordEncoderEncode_B0I0O0(sourceCQL interface{}) interface{} {
+	fromString417 := sourceCQL.(string)
+	var mediumObjCQL mime.WordEncoder
+	intoString584 := mediumObjCQL.Encode("", fromString417)
+	return intoString584
+}
+
+func RunAllTaints_Mime() {
+	{
+		source := newSource(0)
+		out := TaintStepTest_MimeFormatMediaType_B0I0O0(source)
+		sink(0, out)
+	}
+	{
+		source := newSource(1)
+		out := TaintStepTest_MimeFormatMediaType_B0I1O0(source)
+		sink(1, out)
+	}
+	{
+		source := newSource(2)
+		out := TaintStepTest_MimeParseMediaType_B0I0O0(source)
+		sink(2, out)
+	}
+	{
+		source := newSource(3)
+		out := TaintStepTest_MimeParseMediaType_B0I0O1(source)
+		sink(3, out)
+	}
+	{
+		source := newSource(4)
+		out := TaintStepTest_MimeWordDecoderDecode_B0I0O0(source)
+		sink(4, out)
+	}
+	{
+		source := newSource(5)
+		out := TaintStepTest_MimeWordDecoderDecodeHeader_B0I0O0(source)
+		sink(5, out)
+	}
+	{
+		source := newSource(6)
+		out := TaintStepTest_MimeWordEncoderEncode_B0I0O0(source)
+		sink(6, out)
+	}
+}