mirror of
https://github.com/miniflux/v2.git
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629 lines
16 KiB
Go
629 lines
16 KiB
Go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh
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import (
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"bytes"
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"crypto/rand"
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"errors"
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"fmt"
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"os"
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"strings"
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"testing"
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)
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type keyboardInteractive map[string]string
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func (cr keyboardInteractive) Challenge(user string, instruction string, questions []string, echos []bool) ([]string, error) {
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var answers []string
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for _, q := range questions {
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answers = append(answers, cr[q])
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}
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return answers, nil
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}
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// reused internally by tests
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var clientPassword = "tiger"
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// tryAuth runs a handshake with a given config against an SSH server
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// with config serverConfig
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func tryAuth(t *testing.T, config *ClientConfig) error {
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c1, c2, err := netPipe()
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if err != nil {
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t.Fatalf("netPipe: %v", err)
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}
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defer c1.Close()
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defer c2.Close()
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certChecker := CertChecker{
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IsUserAuthority: func(k PublicKey) bool {
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return bytes.Equal(k.Marshal(), testPublicKeys["ecdsa"].Marshal())
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},
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UserKeyFallback: func(conn ConnMetadata, key PublicKey) (*Permissions, error) {
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if conn.User() == "testuser" && bytes.Equal(key.Marshal(), testPublicKeys["rsa"].Marshal()) {
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return nil, nil
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}
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return nil, fmt.Errorf("pubkey for %q not acceptable", conn.User())
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},
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IsRevoked: func(c *Certificate) bool {
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return c.Serial == 666
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},
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}
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serverConfig := &ServerConfig{
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PasswordCallback: func(conn ConnMetadata, pass []byte) (*Permissions, error) {
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if conn.User() == "testuser" && string(pass) == clientPassword {
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return nil, nil
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}
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return nil, errors.New("password auth failed")
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},
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PublicKeyCallback: certChecker.Authenticate,
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KeyboardInteractiveCallback: func(conn ConnMetadata, challenge KeyboardInteractiveChallenge) (*Permissions, error) {
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ans, err := challenge("user",
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"instruction",
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[]string{"question1", "question2"},
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[]bool{true, true})
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if err != nil {
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return nil, err
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}
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ok := conn.User() == "testuser" && ans[0] == "answer1" && ans[1] == "answer2"
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if ok {
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challenge("user", "motd", nil, nil)
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return nil, nil
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}
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return nil, errors.New("keyboard-interactive failed")
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},
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}
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serverConfig.AddHostKey(testSigners["rsa"])
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go newServer(c1, serverConfig)
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_, _, _, err = NewClientConn(c2, "", config)
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return err
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}
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func TestClientAuthPublicKey(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(testSigners["rsa"]),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("unable to dial remote side: %s", err)
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}
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}
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func TestAuthMethodPassword(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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Password(clientPassword),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("unable to dial remote side: %s", err)
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}
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}
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func TestAuthMethodFallback(t *testing.T) {
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var passwordCalled bool
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(testSigners["rsa"]),
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PasswordCallback(
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func() (string, error) {
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passwordCalled = true
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return "WRONG", nil
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}),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("unable to dial remote side: %s", err)
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}
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if passwordCalled {
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t.Errorf("password auth tried before public-key auth.")
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}
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}
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func TestAuthMethodWrongPassword(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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Password("wrong"),
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PublicKeys(testSigners["rsa"]),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("unable to dial remote side: %s", err)
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}
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}
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func TestAuthMethodKeyboardInteractive(t *testing.T) {
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answers := keyboardInteractive(map[string]string{
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"question1": "answer1",
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"question2": "answer2",
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})
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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KeyboardInteractive(answers.Challenge),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("unable to dial remote side: %s", err)
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}
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}
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func TestAuthMethodWrongKeyboardInteractive(t *testing.T) {
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answers := keyboardInteractive(map[string]string{
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"question1": "answer1",
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"question2": "WRONG",
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})
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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KeyboardInteractive(answers.Challenge),
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},
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}
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if err := tryAuth(t, config); err == nil {
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t.Fatalf("wrong answers should not have authenticated with KeyboardInteractive")
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}
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}
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// the mock server will only authenticate ssh-rsa keys
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func TestAuthMethodInvalidPublicKey(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(testSigners["dsa"]),
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},
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}
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if err := tryAuth(t, config); err == nil {
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t.Fatalf("dsa private key should not have authenticated with rsa public key")
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}
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}
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// the client should authenticate with the second key
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func TestAuthMethodRSAandDSA(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(testSigners["dsa"], testSigners["rsa"]),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("client could not authenticate with rsa key: %v", err)
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}
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}
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func TestClientHMAC(t *testing.T) {
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for _, mac := range supportedMACs {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(testSigners["rsa"]),
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},
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Config: Config{
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MACs: []string{mac},
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err != nil {
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t.Fatalf("client could not authenticate with mac algo %s: %v", mac, err)
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}
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}
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}
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// issue 4285.
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func TestClientUnsupportedCipher(t *testing.T) {
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(),
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},
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Config: Config{
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Ciphers: []string{"aes128-cbc"}, // not currently supported
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},
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}
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if err := tryAuth(t, config); err == nil {
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t.Errorf("expected no ciphers in common")
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}
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}
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func TestClientUnsupportedKex(t *testing.T) {
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if os.Getenv("GO_BUILDER_NAME") != "" {
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t.Skip("skipping known-flaky test on the Go build dashboard; see golang.org/issue/15198")
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}
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config := &ClientConfig{
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User: "testuser",
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Auth: []AuthMethod{
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PublicKeys(),
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},
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Config: Config{
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KeyExchanges: []string{"diffie-hellman-group-exchange-sha256"}, // not currently supported
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if err := tryAuth(t, config); err == nil || !strings.Contains(err.Error(), "common algorithm") {
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t.Errorf("got %v, expected 'common algorithm'", err)
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}
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}
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func TestClientLoginCert(t *testing.T) {
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cert := &Certificate{
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Key: testPublicKeys["rsa"],
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ValidBefore: CertTimeInfinity,
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CertType: UserCert,
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}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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certSigner, err := NewCertSigner(cert, testSigners["rsa"])
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if err != nil {
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t.Fatalf("NewCertSigner: %v", err)
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}
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clientConfig := &ClientConfig{
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User: "user",
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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clientConfig.Auth = append(clientConfig.Auth, PublicKeys(certSigner))
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// should succeed
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if err := tryAuth(t, clientConfig); err != nil {
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t.Errorf("cert login failed: %v", err)
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}
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// corrupted signature
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cert.Signature.Blob[0]++
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login passed with corrupted sig")
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}
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// revoked
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cert.Serial = 666
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("revoked cert login succeeded")
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}
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cert.Serial = 1
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// sign with wrong key
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cert.SignCert(rand.Reader, testSigners["dsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login passed with non-authoritative key")
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}
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// host cert
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cert.CertType = HostCert
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login passed with wrong type")
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}
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cert.CertType = UserCert
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// principal specified
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cert.ValidPrincipals = []string{"user"}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err != nil {
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t.Errorf("cert login failed: %v", err)
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}
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// wrong principal specified
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cert.ValidPrincipals = []string{"fred"}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login passed with wrong principal")
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}
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cert.ValidPrincipals = nil
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// added critical option
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cert.CriticalOptions = map[string]string{"root-access": "yes"}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login passed with unrecognized critical option")
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}
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// allowed source address
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cert.CriticalOptions = map[string]string{"source-address": "127.0.0.42/24,::42/120"}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err != nil {
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t.Errorf("cert login with source-address failed: %v", err)
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}
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// disallowed source address
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cert.CriticalOptions = map[string]string{"source-address": "127.0.0.42,::42"}
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cert.SignCert(rand.Reader, testSigners["ecdsa"])
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if err := tryAuth(t, clientConfig); err == nil {
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t.Errorf("cert login with source-address succeeded")
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}
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}
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func testPermissionsPassing(withPermissions bool, t *testing.T) {
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serverConfig := &ServerConfig{
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PublicKeyCallback: func(conn ConnMetadata, key PublicKey) (*Permissions, error) {
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if conn.User() == "nopermissions" {
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return nil, nil
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}
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return &Permissions{}, nil
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},
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}
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serverConfig.AddHostKey(testSigners["rsa"])
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clientConfig := &ClientConfig{
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Auth: []AuthMethod{
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PublicKeys(testSigners["rsa"]),
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},
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HostKeyCallback: InsecureIgnoreHostKey(),
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}
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if withPermissions {
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clientConfig.User = "permissions"
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} else {
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clientConfig.User = "nopermissions"
|
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}
|
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|
|
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c1, c2, err := netPipe()
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if err != nil {
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|
t.Fatalf("netPipe: %v", err)
|
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}
|
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defer c1.Close()
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defer c2.Close()
|
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|
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go NewClientConn(c2, "", clientConfig)
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serverConn, err := newServer(c1, serverConfig)
|
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|
if err != nil {
|
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t.Fatal(err)
|
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|
}
|
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|
if p := serverConn.Permissions; (p != nil) != withPermissions {
|
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|
t.Fatalf("withPermissions is %t, but Permissions object is %#v", withPermissions, p)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestPermissionsPassing(t *testing.T) {
|
||
|
testPermissionsPassing(true, t)
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|
}
|
||
|
|
||
|
func TestNoPermissionsPassing(t *testing.T) {
|
||
|
testPermissionsPassing(false, t)
|
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|
}
|
||
|
|
||
|
func TestRetryableAuth(t *testing.T) {
|
||
|
n := 0
|
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|
passwords := []string{"WRONG1", "WRONG2"}
|
||
|
|
||
|
config := &ClientConfig{
|
||
|
User: "testuser",
|
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|
Auth: []AuthMethod{
|
||
|
RetryableAuthMethod(PasswordCallback(func() (string, error) {
|
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|
p := passwords[n]
|
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|
n++
|
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|
return p, nil
|
||
|
}), 2),
|
||
|
PublicKeys(testSigners["rsa"]),
|
||
|
},
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
|
||
|
if err := tryAuth(t, config); err != nil {
|
||
|
t.Fatalf("unable to dial remote side: %s", err)
|
||
|
}
|
||
|
if n != 2 {
|
||
|
t.Fatalf("Did not try all passwords")
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func ExampleRetryableAuthMethod(t *testing.T) {
|
||
|
user := "testuser"
|
||
|
NumberOfPrompts := 3
|
||
|
|
||
|
// Normally this would be a callback that prompts the user to answer the
|
||
|
// provided questions
|
||
|
Cb := func(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
|
||
|
return []string{"answer1", "answer2"}, nil
|
||
|
}
|
||
|
|
||
|
config := &ClientConfig{
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
User: user,
|
||
|
Auth: []AuthMethod{
|
||
|
RetryableAuthMethod(KeyboardInteractiveChallenge(Cb), NumberOfPrompts),
|
||
|
},
|
||
|
}
|
||
|
|
||
|
if err := tryAuth(t, config); err != nil {
|
||
|
t.Fatalf("unable to dial remote side: %s", err)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if username is received on server side when NoClientAuth is used
|
||
|
func TestClientAuthNone(t *testing.T) {
|
||
|
user := "testuser"
|
||
|
serverConfig := &ServerConfig{
|
||
|
NoClientAuth: true,
|
||
|
}
|
||
|
serverConfig.AddHostKey(testSigners["rsa"])
|
||
|
|
||
|
clientConfig := &ClientConfig{
|
||
|
User: user,
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
|
||
|
c1, c2, err := netPipe()
|
||
|
if err != nil {
|
||
|
t.Fatalf("netPipe: %v", err)
|
||
|
}
|
||
|
defer c1.Close()
|
||
|
defer c2.Close()
|
||
|
|
||
|
go NewClientConn(c2, "", clientConfig)
|
||
|
serverConn, err := newServer(c1, serverConfig)
|
||
|
if err != nil {
|
||
|
t.Fatalf("newServer: %v", err)
|
||
|
}
|
||
|
if serverConn.User() != user {
|
||
|
t.Fatalf("server: got %q, want %q", serverConn.User(), user)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if authentication attempts are limited on server when MaxAuthTries is set
|
||
|
func TestClientAuthMaxAuthTries(t *testing.T) {
|
||
|
user := "testuser"
|
||
|
|
||
|
serverConfig := &ServerConfig{
|
||
|
MaxAuthTries: 2,
|
||
|
PasswordCallback: func(conn ConnMetadata, pass []byte) (*Permissions, error) {
|
||
|
if conn.User() == "testuser" && string(pass) == "right" {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return nil, errors.New("password auth failed")
|
||
|
},
|
||
|
}
|
||
|
serverConfig.AddHostKey(testSigners["rsa"])
|
||
|
|
||
|
expectedErr := fmt.Errorf("ssh: handshake failed: %v", &disconnectMsg{
|
||
|
Reason: 2,
|
||
|
Message: "too many authentication failures",
|
||
|
})
|
||
|
|
||
|
for tries := 2; tries < 4; tries++ {
|
||
|
n := tries
|
||
|
clientConfig := &ClientConfig{
|
||
|
User: user,
|
||
|
Auth: []AuthMethod{
|
||
|
RetryableAuthMethod(PasswordCallback(func() (string, error) {
|
||
|
n--
|
||
|
if n == 0 {
|
||
|
return "right", nil
|
||
|
}
|
||
|
return "wrong", nil
|
||
|
}), tries),
|
||
|
},
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
|
||
|
c1, c2, err := netPipe()
|
||
|
if err != nil {
|
||
|
t.Fatalf("netPipe: %v", err)
|
||
|
}
|
||
|
defer c1.Close()
|
||
|
defer c2.Close()
|
||
|
|
||
|
go newServer(c1, serverConfig)
|
||
|
_, _, _, err = NewClientConn(c2, "", clientConfig)
|
||
|
if tries > 2 {
|
||
|
if err == nil {
|
||
|
t.Fatalf("client: got no error, want %s", expectedErr)
|
||
|
} else if err.Error() != expectedErr.Error() {
|
||
|
t.Fatalf("client: got %s, want %s", err, expectedErr)
|
||
|
}
|
||
|
} else {
|
||
|
if err != nil {
|
||
|
t.Fatalf("client: got %s, want no error", err)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if authentication attempts are correctly limited on server
|
||
|
// when more public keys are provided then MaxAuthTries
|
||
|
func TestClientAuthMaxAuthTriesPublicKey(t *testing.T) {
|
||
|
signers := []Signer{}
|
||
|
for i := 0; i < 6; i++ {
|
||
|
signers = append(signers, testSigners["dsa"])
|
||
|
}
|
||
|
|
||
|
validConfig := &ClientConfig{
|
||
|
User: "testuser",
|
||
|
Auth: []AuthMethod{
|
||
|
PublicKeys(append([]Signer{testSigners["rsa"]}, signers...)...),
|
||
|
},
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
if err := tryAuth(t, validConfig); err != nil {
|
||
|
t.Fatalf("unable to dial remote side: %s", err)
|
||
|
}
|
||
|
|
||
|
expectedErr := fmt.Errorf("ssh: handshake failed: %v", &disconnectMsg{
|
||
|
Reason: 2,
|
||
|
Message: "too many authentication failures",
|
||
|
})
|
||
|
invalidConfig := &ClientConfig{
|
||
|
User: "testuser",
|
||
|
Auth: []AuthMethod{
|
||
|
PublicKeys(append(signers, testSigners["rsa"])...),
|
||
|
},
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
if err := tryAuth(t, invalidConfig); err == nil {
|
||
|
t.Fatalf("client: got no error, want %s", expectedErr)
|
||
|
} else if err.Error() != expectedErr.Error() {
|
||
|
t.Fatalf("client: got %s, want %s", err, expectedErr)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test whether authentication errors are being properly logged if all
|
||
|
// authentication methods have been exhausted
|
||
|
func TestClientAuthErrorList(t *testing.T) {
|
||
|
publicKeyErr := errors.New("This is an error from PublicKeyCallback")
|
||
|
|
||
|
clientConfig := &ClientConfig{
|
||
|
Auth: []AuthMethod{
|
||
|
PublicKeys(testSigners["rsa"]),
|
||
|
},
|
||
|
HostKeyCallback: InsecureIgnoreHostKey(),
|
||
|
}
|
||
|
serverConfig := &ServerConfig{
|
||
|
PublicKeyCallback: func(_ ConnMetadata, _ PublicKey) (*Permissions, error) {
|
||
|
return nil, publicKeyErr
|
||
|
},
|
||
|
}
|
||
|
serverConfig.AddHostKey(testSigners["rsa"])
|
||
|
|
||
|
c1, c2, err := netPipe()
|
||
|
if err != nil {
|
||
|
t.Fatalf("netPipe: %v", err)
|
||
|
}
|
||
|
defer c1.Close()
|
||
|
defer c2.Close()
|
||
|
|
||
|
go NewClientConn(c2, "", clientConfig)
|
||
|
_, err = newServer(c1, serverConfig)
|
||
|
if err == nil {
|
||
|
t.Fatal("newServer: got nil, expected errors")
|
||
|
}
|
||
|
|
||
|
authErrs, ok := err.(*ServerAuthError)
|
||
|
if !ok {
|
||
|
t.Fatalf("errors: got %T, want *ssh.ServerAuthError", err)
|
||
|
}
|
||
|
for i, e := range authErrs.Errors {
|
||
|
switch i {
|
||
|
case 0:
|
||
|
if e.Error() != "no auth passed yet" {
|
||
|
t.Fatalf("errors: got %v, want no auth passed yet", e.Error())
|
||
|
}
|
||
|
case 1:
|
||
|
if e != publicKeyErr {
|
||
|
t.Fatalf("errors: got %v, want %v", e, publicKeyErr)
|
||
|
}
|
||
|
default:
|
||
|
t.Fatalf("errors: got %v, expected 2 errors", authErrs.Errors)
|
||
|
}
|
||
|
}
|
||
|
}
|