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keyboard interactive: ask only the passcode if it is the second step

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Signed-off-by: Nicola Murino <nicola.murino@gmail.com>
This commit is contained in:
Nicola Murino 2024-02-05 19:02:01 +01:00
parent ae309d64c4
commit c49553abd0
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GPG key ID: 935D2952DEC4EECF
4 changed files with 133 additions and 23 deletions
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102
internal/common/protocol_test.go
View file

@ -81,6 +81,45 @@ const (
osWindows = "windows"
testFileName = "test_file_common_sftp.dat"
testDir = "test_dir_common"
testPubKey = "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC03jj0D+djk7pxIf/0OhrxrchJTRZklofJ1NoIu4752Sq02mdXmarMVsqJ1cAjV5LBVy3D1F5U6XW4rppkXeVtd04Pxb09ehtH0pRRPaoHHlALiJt8CoMpbKYMA8b3KXPPriGxgGomvtU2T2RMURSwOZbMtpsugfjYSWenyYX+VORYhylWnSXL961LTyC21ehd6d6QnW9G7E5hYMITMY9TuQZz3bROYzXiTsgN0+g6Hn7exFQp50p45StUMfV/SftCMdCxlxuyGny2CrN/vfjO7xxOo2uv7q1qm10Q46KPWJQv+pgZ/OfL+EDjy07n5QVSKHlbx+2nT4Q0EgOSQaCTYwn3YjtABfIxWwgAFdyj6YlPulCL22qU4MYhDcA6PSBwDdf8hvxBfvsiHdM+JcSHvv8/VeJhk6CmnZxGY0fxBupov27z3yEO8nAg8k+6PaUiW1MSUfuGMF/ktB8LOstXsEPXSszuyXiOv4DaryOXUiSn7bmRqKcEFlJusO6aZP0= nicola@p1"
testPrivateKey = `-----BEGIN OPENSSH PRIVATE KEY-----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-----END OPENSSH PRIVATE KEY-----`
)
var (
@ -7812,6 +7851,69 @@ func TestBuiltinKeyboardInteractiveAuthentication(t *testing.T) {
assert.NoError(t, err)
}
func TestMultiStepBuiltinKeyboardAuth(t *testing.T) {
u := getTestUser()
u.PublicKeys = []string{testPubKey}
u.Filters.DeniedLoginMethods = []string{
dataprovider.SSHLoginMethodPublicKey,
dataprovider.LoginMethodPassword,
dataprovider.SSHLoginMethodKeyboardInteractive,
}
user, _, err := httpdtest.AddUser(u, http.StatusCreated)
assert.NoError(t, err)
signer, err := ssh.ParsePrivateKey([]byte(testPrivateKey))
assert.NoError(t, err)
// public key + password
authMethods := []ssh.AuthMethod{
ssh.PublicKeys(signer),
ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) ([]string, error) {
return []string{defaultPassword}, nil
}),
}
conn, client, err := getCustomAuthSftpClient(user, authMethods)
if assert.NoError(t, err) {
defer conn.Close()
defer client.Close()
assert.NoError(t, checkBasicSFTP(client))
err = writeSFTPFile(testFileName, 4096, client)
assert.NoError(t, err)
}
// add multi-factor authentication
configName, key, _, err := mfa.GenerateTOTPSecret(mfa.GetAvailableTOTPConfigNames()[0], user.Username)
assert.NoError(t, err)
user.Password = defaultPassword
user.Filters.TOTPConfig = dataprovider.UserTOTPConfig{
Enabled: true,
ConfigName: configName,
Secret: kms.NewPlainSecret(key.Secret()),
Protocols: []string{common.ProtocolSSH},
}
err = dataprovider.UpdateUser(&user, "", "", "")
assert.NoError(t, err)
passcode, err := generateTOTPPasscode(key.Secret(), otp.AlgorithmSHA1)
assert.NoError(t, err)
// public key + passcode
authMethods = []ssh.AuthMethod{
ssh.PublicKeys(signer),
ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) ([]string, error) {
return []string{passcode}, nil
}),
}
conn, client, err = getCustomAuthSftpClient(user, authMethods)
if assert.NoError(t, err) {
defer conn.Close()
defer client.Close()
assert.NoError(t, checkBasicSFTP(client))
err = writeSFTPFile(testFileName, 4096, client)
assert.NoError(t, err)
}
_, err = httpdtest.RemoveUser(user, http.StatusOK)
assert.NoError(t, err)
err = os.RemoveAll(user.GetHomeDir())
assert.NoError(t, err)
}
func TestRenameSymlink(t *testing.T) {
u := getTestUser()
testDir := "/dir-no-create-links"

44
internal/dataprovider/dataprovider.go
View file

@ -1371,7 +1371,9 @@ func CheckUserAndPubKey(username string, pubKey []byte, ip, protocol string, isS
// CheckKeyboardInteractiveAuth checks the keyboard interactive authentication and returns
// the authenticated user or an error
func CheckKeyboardInteractiveAuth(username, authHook string, client ssh.KeyboardInteractiveChallenge, ip, protocol string) (User, error) {
func CheckKeyboardInteractiveAuth(username, authHook string, client ssh.KeyboardInteractiveChallenge,
ip, protocol string, isPartialAuth bool,
) (User, error) {
var user User
var err error
username = config.convertName(username)
@ -1387,7 +1389,7 @@ func CheckKeyboardInteractiveAuth(username, authHook string, client ssh.Keyboard
if err != nil {
return user, err
}
return doKeyboardInteractiveAuth(&user, authHook, client, ip, protocol)
return doKeyboardInteractiveAuth(&user, authHook, client, ip, protocol, isPartialAuth)
}
// GetFTPPreAuthUser returns the SFTPGo user with the specified username
@ -3624,21 +3626,25 @@ func sendKeyboardAuthHTTPReq(url string, request *plugin.KeyboardAuthRequest) (*
return &response, err
}
func doBuiltinKeyboardInteractiveAuth(user *User, client ssh.KeyboardInteractiveChallenge, ip, protocol string) (int, error) {
answers, err := client("", "", []string{"Password: "}, []bool{false})
if err != nil {
func doBuiltinKeyboardInteractiveAuth(user *User, client ssh.KeyboardInteractiveChallenge,
ip, protocol string, isPartialAuth bool,
) (int, error) {
if err := user.LoadAndApplyGroupSettings(); err != nil {
return 0, err
}
if len(answers) != 1 {
return 0, fmt.Errorf("unexpected number of answers: %d", len(answers))
}
err = user.LoadAndApplyGroupSettings()
if err != nil {
return 0, err
}
_, err = checkUserAndPass(user, answers[0], ip, protocol)
if err != nil {
return 0, err
hasSecondFactor := user.Filters.TOTPConfig.Enabled && util.Contains(user.Filters.TOTPConfig.Protocols, protocolSSH)
if !isPartialAuth || !hasSecondFactor {
answers, err := client("", "", []string{"Password: "}, []bool{false})
if err != nil {
return 0, err
}
if len(answers) != 1 {
return 0, fmt.Errorf("unexpected number of answers: %d", len(answers))
}
_, err = checkUserAndPass(user, answers[0], ip, protocol)
if err != nil {
return 0, err
}
}
return checkKeyboardInteractiveSecondFactor(user, client, protocol)
}
@ -3881,7 +3887,9 @@ func executeKeyboardInteractiveProgram(user *User, authHook string, client ssh.K
return authResult, err
}
func doKeyboardInteractiveAuth(user *User, authHook string, client ssh.KeyboardInteractiveChallenge, ip, protocol string) (User, error) {
func doKeyboardInteractiveAuth(user *User, authHook string, client ssh.KeyboardInteractiveChallenge,
ip, protocol string, isPartialAuth bool,
) (User, error) {
if err := user.LoadAndApplyGroupSettings(); err != nil {
return *user, err
}
@ -3900,10 +3908,10 @@ func doKeyboardInteractiveAuth(user *User, authHook string, client ssh.KeyboardI
authResult, err = executeKeyboardInteractiveProgram(user, authHook, client, ip, protocol)
}
} else {
authResult, err = doBuiltinKeyboardInteractiveAuth(user, client, ip, protocol)
authResult, err = doBuiltinKeyboardInteractiveAuth(user, client, ip, protocol, isPartialAuth)
}
} else {
authResult, err = doBuiltinKeyboardInteractiveAuth(user, client, ip, protocol)
authResult, err = doBuiltinKeyboardInteractiveAuth(user, client, ip, protocol, isPartialAuth)
}
if err != nil {
return *user, err

8
internal/sftpd/server.go
View file

@ -588,7 +588,7 @@ func (c *Configuration) configureKeyboardInteractiveAuth(serverConfig *ssh.Serve
}
}
serverConfig.KeyboardInteractiveCallback = func(conn ssh.ConnMetadata, client ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
return c.validateKeyboardInteractiveCredentials(conn, client, dataprovider.SSHLoginMethodKeyboardInteractive)
return c.validateKeyboardInteractiveCredentials(conn, client, dataprovider.SSHLoginMethodKeyboardInteractive, false)
}
serviceStatus.Authentications = append(serviceStatus.Authentications, dataprovider.SSHLoginMethodKeyboardInteractive)
@ -1193,7 +1193,7 @@ func (c *Configuration) getPartialSuccessError(nextAuthMethods []string) error {
}
if c.KeyboardInteractiveAuthentication && util.Contains(nextAuthMethods, dataprovider.SSHLoginMethodKeyboardInteractive) {
err.KeyboardInteractiveCallback = func(conn ssh.ConnMetadata, client ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
return c.validateKeyboardInteractiveCredentials(conn, client, dataprovider.SSHLoginMethodKeyAndKeyboardInt)
return c.validateKeyboardInteractiveCredentials(conn, client, dataprovider.SSHLoginMethodKeyAndKeyboardInt, true)
}
}
return err
@ -1288,7 +1288,7 @@ func (c *Configuration) validatePasswordCredentials(conn ssh.ConnMetadata, pass
}
func (c *Configuration) validateKeyboardInteractiveCredentials(conn ssh.ConnMetadata, client ssh.KeyboardInteractiveChallenge,
method string,
method string, isPartialAuth bool,
) (*ssh.Permissions, error) {
var err error
var user dataprovider.User
@ -1296,7 +1296,7 @@ func (c *Configuration) validateKeyboardInteractiveCredentials(conn ssh.ConnMeta
ipAddr := util.GetIPFromRemoteAddress(conn.RemoteAddr().String())
if user, err = dataprovider.CheckKeyboardInteractiveAuth(conn.User(), c.KeyboardInteractiveHook, client,
ipAddr, common.ProtocolSSH); err == nil {
ipAddr, common.ProtocolSSH, isPartialAuth); err == nil {
sshPerm, err = loginUser(&user, method, "", conn)
}
user.Username = conn.User()

2
internal/sftpd/sftpd_test.go
View file

@ -11310,7 +11310,7 @@ func getCustomAuthSftpClient(user dataprovider.User, authMethods []ssh.AuthMetho
}
var err error
var conn *ssh.Client
if len(addr) > 0 {
if addr != "" {
conn, err = ssh.Dial("tcp", addr, config)
} else {
conn, err = ssh.Dial("tcp", sftpServerAddr, config)