[#480] Add fuzzing tests

Signed-off-by: Roman Ognev <r.ognev@yadro.com>

api/auth/center_fuzz_test.go

@@ -0,0 +1,88 @@
+//go:build gofuzz
+// +build gofuzz
+
+package auth
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	utils "github.com/trailofbits/go-fuzz-utils"
+)
+
+const (
+	fuzzSuccessExitCode = 0
+	fuzzFailExitCode    = -1
+)
+
+func InitFuzzAuthenticate() {
+}
+
+func DoFuzzAuthenticate(input []byte) int {
+	// FUZZER INIT
+	if len(input) < 100 {
+		return fuzzFailExitCode
+	}
+
+	tp, err := utils.NewTypeProvider(input)
+	if err != nil {
+		return fuzzFailExitCode
+	}
+
+	var accessKeyAddr oid.Address
+	err = tp.Fill(accessKeyAddr)
+	if err != nil {
+		return fuzzFailExitCode
+	}
+
+	accessKeyID := strings.ReplaceAll(accessKeyAddr.String(), "/", "0")
+	secretKey, err := tp.GetString()
+	awsCreds := credentials.NewStaticCredentials(accessKeyID, secretKey, "")
+
+	reqData := RequestData{
+		Method:   "GET",
+		Endpoint: "http://localhost:8084",
+		Bucket:   "my-bucket",
+		Object:   "@obj/name",
+	}
+	presignData := PresignData{
+		Service:  "s3",
+		Region:   "spb",
+		Lifetime: 10 * time.Minute,
+		SignTime: time.Now().UTC(),
+	}
+
+	req, err := PresignRequest(awsCreds, reqData, presignData)
+	if req == nil {
+		return fuzzFailExitCode
+	}
+
+	expBox := &accessbox.Box{
+		Gate: &accessbox.GateData{
+			SecretKey: secretKey,
+		},
+	}
+
+	mock := newTokensFrostfsMock()
+	mock.addBox(accessKeyAddr, expBox)
+
+	c := &Center{
+		cli:     mock,
+		reg:     NewRegexpMatcher(authorizationFieldRegexp),
+		postReg: NewRegexpMatcher(postPolicyCredentialRegexp),
+	}
+
+	_, _ = c.Authenticate(req)
+
+	return fuzzSuccessExitCode
+}
+
+func FuzzAuthenticate(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte) {
+		DoFuzzAuthenticate(data)
+	})
+}