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272 lines
9.2 KiB
272 lines
9.2 KiB
// Mint, (C) 2018 Minio, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"crypto/tls"
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"encoding/json"
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"fmt"
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"os"
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"time"
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log "github.com/sirupsen/logrus"
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)
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const testName = "TLS-tests"
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const (
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// PASS indicate that a test passed
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PASS = "PASS"
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// FAIL indicate that a test failed
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FAIL = "FAIL"
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// NA indicates that a test is not applicable
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NA = "NA"
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)
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func main() {
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log.SetOutput(os.Stdout)
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log.SetFormatter(&mintJSONFormatter{})
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log.SetLevel(log.InfoLevel)
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endpoint := os.Getenv("SERVER_ENDPOINT")
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secure := os.Getenv("ENABLE_HTTPS")
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if secure != "1" {
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log.WithFields(log.Fields{"name:": testName, "status": NA, "message": "TLS is not enabled"}).Info()
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return
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}
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testTLSVersions(endpoint)
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testTLSCiphers(endpoint)
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testTLSEllipticCurves(endpoint)
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}
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// Tests whether the endpoint accepts TLS1.0 or TLS1.1 connections - fail if so.
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// Tests whether the endpoint accepts TLS1.2 connections - fail if not.
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func testTLSVersions(endpoint string) {
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const function = "TLSVersions"
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startTime := time.Now()
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// Tests whether the endpoint accepts TLS1.0 or TLS1.1 connections
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args := map[string]interface{}{
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"MinVersion": "tls.VersionTLS10",
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"MaxVersion": "tls.VersionTLS11",
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}
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_, err := tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS10,
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MaxVersion: tls.VersionTLS11,
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})
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if err == nil {
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failureLog(function, args, startTime, "", "Endpoint accepts insecure connection", err).Error()
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return
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}
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// Tests whether the endpoint accepts TLS1.2 connections
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args = map[string]interface{}{
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"MinVersion": "tls.VersionTLS12",
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}
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_, err = tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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})
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if err != nil {
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failureLog(function, args, startTime, "", "Endpoint rejects secure connection", err).Error()
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return
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}
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successLog(function, args, startTime)
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}
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// Tests whether the endpoint accepts SSL3.0, TLS1.0 or TLS1.1 connections - fail if so.
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// Tests whether the endpoint accepts TLS1.2 connections - fail if not.
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func testTLSCiphers(endpoint string) {
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const function = "TLSCiphers"
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startTime := time.Now()
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// Tests whether the endpoint accepts insecure ciphers
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args := map[string]interface{}{
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"MinVersion": "tls.VersionTLS12",
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"CipherSuites": unsupportedCipherSuites,
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}
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_, err := tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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CipherSuites: unsupportedCipherSuites,
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})
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if err == nil {
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failureLog(function, args, startTime, "", "Endpoint accepts insecure cipher suites", err).Error()
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return
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}
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// Tests whether the endpoint accepts at least one secure cipher
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args = map[string]interface{}{
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"MinVersion": "tls.VersionTLS12",
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"CipherSuites": supportedCipherSuites,
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}
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_, err = tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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CipherSuites: supportedCipherSuites,
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})
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if err != nil {
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failureLog(function, args, startTime, "", "Endpoint rejects all secure cipher suites", err).Error()
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return
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}
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// Tests whether the endpoint accepts at least one default cipher
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args = map[string]interface{}{
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"MinVersion": "tls.VersionTLS12",
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"CipherSuites": nil,
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}
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_, err = tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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CipherSuites: nil, // default value
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})
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if err != nil {
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failureLog(function, args, startTime, "", "Endpoint rejects default cipher suites", err).Error()
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return
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}
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successLog(function, args, startTime)
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}
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// Tests whether the endpoint accepts the P-384 or P-521 elliptic curve - fail if so.
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// Tests whether the endpoint accepts Curve25519 or P-256 - fail if not.
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func testTLSEllipticCurves(endpoint string) {
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const function = "TLSEllipticCurves"
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startTime := time.Now()
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// Tests whether the endpoint accepts curves using non-constant time implementations.
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args := map[string]interface{}{
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"CurvePreferences": unsupportedCurves,
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}
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_, err := tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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CurvePreferences: unsupportedCurves,
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CipherSuites: supportedCipherSuites,
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})
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if err == nil {
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failureLog(function, args, startTime, "", "Endpoint accepts insecure elliptic curves", err).Error()
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return
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}
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// Tests whether the endpoint accepts curves using constant time implementations.
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args = map[string]interface{}{
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"CurvePreferences": unsupportedCurves,
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}
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_, err = tls.Dial("tcp", endpoint, &tls.Config{
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MinVersion: tls.VersionTLS12,
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CurvePreferences: supportedCurves,
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CipherSuites: supportedCipherSuites,
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})
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if err != nil {
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failureLog(function, args, startTime, "", "Endpoint does not accept secure elliptic curves", err).Error()
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return
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}
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successLog(function, args, startTime)
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}
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func successLog(function string, args map[string]interface{}, startTime time.Time) *log.Entry {
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duration := time.Since(startTime).Nanoseconds() / 1000000
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return log.WithFields(log.Fields{
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"name": testName,
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"function": function,
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"args": args,
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"duration": duration,
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"status": PASS,
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})
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}
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func failureLog(function string, args map[string]interface{}, startTime time.Time, alert string, message string, err error) *log.Entry {
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duration := time.Since(startTime).Nanoseconds() / 1000000
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fields := log.Fields{
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"name": testName,
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"function": function,
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"args": args,
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"duration": duration,
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"status": FAIL,
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"alert": alert,
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"message": message,
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}
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if err != nil {
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fields["error"] = err
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}
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return log.WithFields(fields)
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}
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type mintJSONFormatter struct {
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}
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func (f *mintJSONFormatter) Format(entry *log.Entry) ([]byte, error) {
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data := make(log.Fields, len(entry.Data))
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for k, v := range entry.Data {
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switch v := v.(type) {
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case error:
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// Otherwise errors are ignored by `encoding/json`
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// https://github.com/sirupsen/logrus/issues/137
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data[k] = v.Error()
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default:
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data[k] = v
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}
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}
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serialized, err := json.Marshal(data)
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if err != nil {
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return nil, fmt.Errorf("Failed to marshal fields to JSON, %w", err)
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}
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return append(serialized, '\n'), nil
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}
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// Secure Go implementations of modern TLS ciphers
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// The following ciphers are excluded because:
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// - RC4 ciphers: RC4 is broken
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// - 3DES ciphers: Because of the 64 bit blocksize of DES (Sweet32)
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// - CBC-SHA256 ciphers: No countermeasures against Lucky13 timing attack
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// - CBC-SHA ciphers: Legacy ciphers (SHA-1) and non-constant time
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// implementation of CBC.
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// (CBC-SHA ciphers can be enabled again if required)
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// - RSA key exchange ciphers: Disabled because of dangerous PKCS1-v1.5 RSA
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// padding scheme. See Bleichenbacher attacks.
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var supportedCipherSuites = []uint16{
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tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
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tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
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tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
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tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
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}
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// Supported elliptic curves: Implementations are constant-time.
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var supportedCurves = []tls.CurveID{tls.X25519, tls.CurveP256}
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var unsupportedCipherSuites = []uint16{
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, // No countermeasures against timing attacks
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, // Broken cipher
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tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, // Sweet32
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tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, // No countermeasures against timing attacks
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tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA, // Broken cipher
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// all RSA-PKCS1-v1.5 ciphers are disabled - danger of Bleichenbacher attack variants
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tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA, // Sweet32
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tls.TLS_RSA_WITH_AES_128_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_RSA_WITH_AES_128_CBC_SHA256, // No countermeasures against timing attacks
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tls.TLS_RSA_WITH_AES_256_CBC_SHA, // Go stack contains (some) countermeasures against timing attacks (Lucky13)
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tls.TLS_RSA_WITH_RC4_128_SHA, // Broken cipher
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tls.TLS_RSA_WITH_AES_128_GCM_SHA256, // Disabled because of RSA-PKCS1-v1.5 - AES-GCM is considered secure.
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tls.TLS_RSA_WITH_AES_256_GCM_SHA384, // Disabled because of RSA-PKCS1-v1.5 - AES-GCM is considered secure.
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}
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// Unsupported elliptic curves: Implementations are not constant-time.
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var unsupportedCurves = []tls.CurveID{tls.CurveP384, tls.CurveP521}
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