[Fuzzing] Add fuzz testing (#448)

* [Fuzzing] Add fuzz testing

Signed-off-by: Arjun Singh <[email protected]>

* [Fuzzing]  remove FuzzEscapeFilter

Signed-off-by: Arjun Singh <[email protected]>

Makefile

@@ -55,6 +55,11 @@ test:
 quicktest:
 	go test ./...
 
+fuzz:
+	go test -fuzz=FuzzParseDN				-fuzztime=600s .
+	go test -fuzz=FuzzDecodeEscapedSymbols	-fuzztime=600s .
+	go test -fuzz=FuzzEscapeDN 				-fuzztime=600s .
+
 # Capture output and force failure when there is non-empty output
 fmt:
 	@echo gofmt -l .

fuzz_test.go

@@ -0,0 +1,47 @@
+//go:build go1.18
+// +build go1.18
+
+package ldap
+
+import "testing"
+
+func FuzzParseDN(f *testing.F) {
+
+	f.Add("*")
+	f.Add("cn=Jim\\0Test")
+	f.Add("cn=Jim\\0")
+	f.Add("DC=example,=net")
+	f.Add("o=a+o=B")
+
+	f.Fuzz(func(t *testing.T, input_data string) {
+		_, _ = ParseDN(input_data)
+	})
+}
+
+func FuzzDecodeEscapedSymbols(f *testing.F) {
+
+	f.Add([]byte("a\u0100\x80"))
+	f.Add([]byte(`start\d`))
+	f.Add([]byte(`\`))
+	f.Add([]byte(`start\--end`))
+	f.Add([]byte(`start\d0\hh`))
+
+	f.Fuzz(func(t *testing.T, input_data []byte) {
+		_, _ = decodeEscapedSymbols(input_data)
+	})
+}
+
+func FuzzEscapeDN(f *testing.F) {
+
+	f.Add("test,user")
+	f.Add("#test#user#")
+	f.Add("\\test\\user\\")
+	f.Add("  test user  ")
+	f.Add("\u0000te\x00st\x00user" + string(rune(0)))
+	f.Add("test\"+,;<>\\-_user")
+	f.Add("test\u0391user ")
+
+	f.Fuzz(func(t *testing.T, input_data string) {
+		_ = EscapeDN(input_data)
+	})
+}