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Configurable SSH cipher suite (#913)
* Configurable SSH cipher suite * Update configuration file comment * Add default in settings loading code * Fix fmt and log messsage * Remove default from code as this could probably might not be good idea
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3
conf/app.ini
vendored
3
conf/app.ini
vendored
@ -125,6 +125,9 @@ SSH_PORT = 22
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SSH_LISTEN_PORT = %(SSH_PORT)s
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; Root path of SSH directory, default is '~/.ssh', but you have to use '/home/git/.ssh'.
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SSH_ROOT_PATH =
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; For built-in SSH server only, choose the ciphers to support for SSH connections,
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; for system SSH this setting has no effect
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SSH_SERVER_CIPHERS = aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, arcfour256, arcfour128
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; Directory to create temporary files when test public key using ssh-keygen,
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; default is system temporary directory.
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SSH_KEY_TEST_PATH =
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@ -96,6 +96,7 @@ var (
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ListenHost string `ini:"SSH_LISTEN_HOST"`
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ListenPort int `ini:"SSH_LISTEN_PORT"`
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RootPath string `ini:"SSH_ROOT_PATH"`
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ServerCiphers []string `ini:"SSH_SERVER_CIPHERS"`
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KeyTestPath string `ini:"SSH_KEY_TEST_PATH"`
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KeygenPath string `ini:"SSH_KEYGEN_PATH"`
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AuthorizedKeysBackup bool `ini:"SSH_AUTHORIZED_KEYS_BACKUP"`
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@ -708,6 +709,7 @@ func NewContext() {
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SSH.Domain = Domain
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}
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SSH.RootPath = path.Join(homeDir, ".ssh")
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SSH.ServerCiphers = sec.Key("SSH_SERVER_CIPHERS").Strings(",")
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SSH.KeyTestPath = os.TempDir()
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if err = Cfg.Section("server").MapTo(&SSH); err != nil {
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log.Fatal(4, "Failed to map SSH settings: %v", err)
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@ -151,8 +151,11 @@ func listen(config *ssh.ServerConfig, host string, port int) {
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}
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// Listen starts a SSH server listens on given port.
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func Listen(host string, port int) {
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func Listen(host string, port int, ciphers []string) {
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config := &ssh.ServerConfig{
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Config: ssh.Config{
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Ciphers: ciphers,
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},
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PublicKeyCallback: func(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
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pkey, err := models.SearchPublicKeyByContent(strings.TrimSpace(string(ssh.MarshalAuthorizedKey(key))))
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if err != nil {
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@ -77,7 +77,7 @@ func GlobalInit() {
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checkRunMode()
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if setting.InstallLock && setting.SSH.StartBuiltinServer {
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ssh.Listen(setting.SSH.ListenHost, setting.SSH.ListenPort)
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log.Info("SSH server started on %s:%v", setting.SSH.ListenHost, setting.SSH.ListenPort)
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ssh.Listen(setting.SSH.ListenHost, setting.SSH.ListenPort, setting.SSH.ServerCiphers)
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log.Info("SSH server started on %s:%d. Cipher list (%v)", setting.SSH.ListenHost, setting.SSH.ListenPort, setting.SSH.ServerCiphers)
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}
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}
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