gosec/rules/rand_test.go

// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package rules

import (
	"testing"

	"github.com/GoASTScanner/gas"
)

func TestRandOk(t *testing.T) {
	config := map[string]interface{}{"ignoreNosec": false}
	analyzer := gas.NewAnalyzer(config, nil)
	analyzer.AddRule(NewWeakRandCheck(config))

	issues := gasTestRunner(
		`
		package main

		import "crypto/rand"

		func main() {
			good, _ := rand.Read(nil)
			println(good)
		}`, analyzer)

	checkTestResults(t, issues, 0, "Not expected to match")
}

func TestRandBad(t *testing.T) {
	config := map[string]interface{}{"ignoreNosec": false}
	analyzer := gas.NewAnalyzer(config, nil)
	analyzer.AddRule(NewWeakRandCheck(config))

	issues := gasTestRunner(
		`
		package main

		import "math/rand"

		func main() {
			bad := rand.Int()
			println(bad)

		}`, analyzer)

	checkTestResults(t, issues, 1, "Use of weak random number generator (math/rand instead of crypto/rand)")
}

func TestRandRenamed(t *testing.T) {
	config := map[string]interface{}{"ignoreNosec": false}
	analyzer := gas.NewAnalyzer(config, nil)
	analyzer.AddRule(NewWeakRandCheck(config))

	issues := gasTestRunner(
		`
		package main

		import (
			"crypto/rand"
			mrand "math/rand"
		)


		func main() {
			good, _ := rand.Read(nil)
			println(good)
			i := mrand.Int31()
			println(i)
		}`, analyzer)

	checkTestResults(t, issues, 0, "Not expected to match")
}