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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Tests for ssh client multi-auth
//
// These tests run a simple go ssh client against OpenSSH server
// over unix domain sockets. The tests use multiple combinations
// of password, keyboard-interactive and publickey authentication
// methods.
//
// A wrapper library for making sshd PAM authentication use test
// passwords is required in ./sshd_test_pw.so. If the library does
// not exist these tests will be skipped. See compile instructions
// (for linux) in file ./sshd_test_pw.c.
// +build linux
package test
import (
"fmt"
"strings"
"testing"
"golang.org/x/crypto/ssh"
)
// test cases
type multiAuthTestCase struct {
authMethods []string
expectedPasswordCbs int
expectedKbdIntCbs int
}
// test context
type multiAuthTestCtx struct {
password string
numPasswordCbs int
numKbdIntCbs int
}
// create test context
func newMultiAuthTestCtx(t *testing.T) *multiAuthTestCtx {
password, err := randomPassword()
if err != nil {
t.Fatalf("Failed to generate random test password: %s", err.Error())
}
return &multiAuthTestCtx{
password: password,
}
}
// password callback
func (ctx *multiAuthTestCtx) passwordCb() (secret string, err error) {
ctx.numPasswordCbs++
return ctx.password, nil
}
// keyboard-interactive callback
func (ctx *multiAuthTestCtx) kbdIntCb(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
if len(questions) == 0 {
return nil, nil
}
ctx.numKbdIntCbs++
if len(questions) == 1 {
return []string{ctx.password}, nil
}
return nil, fmt.Errorf("unsupported keyboard-interactive flow")
}
// TestMultiAuth runs several subtests for different combinations of password, keyboard-interactive and publickey authentication methods
func TestMultiAuth(t *testing.T) {
testCases := []multiAuthTestCase{
// Test password,publickey authentication, assert that password callback is called 1 time
multiAuthTestCase{
authMethods: []string{"password", "publickey"},
expectedPasswordCbs: 1,
},
// Test keyboard-interactive,publickey authentication, assert that keyboard-interactive callback is called 1 time
multiAuthTestCase{
authMethods: []string{"keyboard-interactive", "publickey"},
expectedKbdIntCbs: 1,
},
// Test publickey,password authentication, assert that password callback is called 1 time
multiAuthTestCase{
authMethods: []string{"publickey", "password"},
expectedPasswordCbs: 1,
},
// Test publickey,keyboard-interactive authentication, assert that keyboard-interactive callback is called 1 time
multiAuthTestCase{
authMethods: []string{"publickey", "keyboard-interactive"},
expectedKbdIntCbs: 1,
},
// Test password,password authentication, assert that password callback is called 2 times
multiAuthTestCase{
authMethods: []string{"password", "password"},
expectedPasswordCbs: 2,
},
}
for _, testCase := range testCases {
t.Run(strings.Join(testCase.authMethods, ","), func(t *testing.T) {
ctx := newMultiAuthTestCtx(t)
server := newServerForConfig(t, "MultiAuth", map[string]string{"AuthMethods": strings.Join(testCase.authMethods, ",")})
defer server.Shutdown()
clientConfig := clientConfig()
server.setTestPassword(clientConfig.User, ctx.password)
publicKeyAuthMethod := clientConfig.Auth[0]
clientConfig.Auth = nil
for _, authMethod := range testCase.authMethods {
switch authMethod {
case "publickey":
clientConfig.Auth = append(clientConfig.Auth, publicKeyAuthMethod)
case "password":
clientConfig.Auth = append(clientConfig.Auth,
ssh.RetryableAuthMethod(ssh.PasswordCallback(ctx.passwordCb), 5))
case "keyboard-interactive":
clientConfig.Auth = append(clientConfig.Auth,
ssh.RetryableAuthMethod(ssh.KeyboardInteractive(ctx.kbdIntCb), 5))
default:
t.Fatalf("Unknown authentication method %s", authMethod)
}
}
conn := server.Dial(clientConfig)
defer conn.Close()
if ctx.numPasswordCbs != testCase.expectedPasswordCbs {
t.Fatalf("passwordCallback was called %d times, expected %d times", ctx.numPasswordCbs, testCase.expectedPasswordCbs)
}
if ctx.numKbdIntCbs != testCase.expectedKbdIntCbs {
t.Fatalf("keyboardInteractiveCallback was called %d times, expected %d times", ctx.numKbdIntCbs, testCase.expectedKbdIntCbs)
}
})
}
}
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