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https://github.com/rclone/rclone
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sftp: add option to force the usage of an ssh-agent
Also adds the possibility to specify a specific key to request from the ssh-agent.
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parent
c1998c4efe
commit
0458b961c5
@ -66,7 +66,7 @@ func init() {
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IsPassword: true,
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}, {
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Name: "key_file",
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Help: "Path to PEM-encoded private key file, leave blank to use ssh-agent.",
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Help: "Path to PEM-encoded private key file, leave blank or set key-use-agent to use ssh-agent.",
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}, {
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Name: "key_file_pass",
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Help: `The passphrase to decrypt the PEM-encoded private key file.
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@ -74,6 +74,14 @@ func init() {
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Only PEM encrypted key files (old OpenSSH format) are supported. Encrypted keys
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in the new OpenSSH format can't be used.`,
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IsPassword: true,
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}, {
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Name: "key_use_agent",
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Help: `When set forces the usage of the ssh-agent.
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When key-file is also set, the ".pub" file of the specified key-file is read and only the associated key is
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requested from the ssh-agent. This allows to avoid ` + "`Too many authentication failures for *username*`" + ` errors
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when the ssh-agent contains many keys.`,
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Default: false,
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}, {
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Name: "use_insecure_cipher",
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Help: "Enable the use of the aes128-cbc cipher. This cipher is insecure and may allow plaintext data to be recovered by an attacker.",
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@ -130,6 +138,7 @@ type Options struct {
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Pass string `config:"pass"`
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KeyFile string `config:"key_file"`
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KeyFilePass string `config:"key_file_pass"`
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KeyUseAgent bool `config:"key_use_agent"`
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UseInsecureCipher bool `config:"use_insecure_cipher"`
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DisableHashCheck bool `config:"disable_hashcheck"`
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AskPassword bool `config:"ask_password"`
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@ -334,7 +343,7 @@ func NewFs(name, root string, m configmap.Mapper) (fs.Fs, error) {
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}
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// Add ssh agent-auth if no password or file specified
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if opt.Pass == "" && opt.KeyFile == "" {
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if (opt.Pass == "" && opt.KeyFile == "") || opt.KeyUseAgent {
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sshAgentClient, _, err := sshagent.New()
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if err != nil {
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return nil, errors.Wrap(err, "couldn't connect to ssh-agent")
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@ -343,7 +352,30 @@ func NewFs(name, root string, m configmap.Mapper) (fs.Fs, error) {
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if err != nil {
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return nil, errors.Wrap(err, "couldn't read ssh agent signers")
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}
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sshConfig.Auth = append(sshConfig.Auth, ssh.PublicKeys(signers...))
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if opt.KeyFile != "" {
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pubBytes, err := ioutil.ReadFile(opt.KeyFile + ".pub")
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if err != nil {
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return nil, errors.Wrap(err, "failed to read public key file")
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}
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pub, _, _, _, err := ssh.ParseAuthorizedKey(pubBytes)
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if err != nil {
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return nil, errors.Wrap(err, "failed to parse public key file")
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}
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pubM := pub.Marshal()
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found := false
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for _, s := range signers {
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if bytes.Equal(pubM, s.PublicKey().Marshal()) {
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sshConfig.Auth = append(sshConfig.Auth, ssh.PublicKeys(s))
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found = true
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break
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}
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}
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if !found {
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return nil, errors.New("private key not found in the ssh-agent")
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}
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} else {
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sshConfig.Auth = append(sshConfig.Auth, ssh.PublicKeys(signers...))
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}
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}
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// Load key file if specified
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@ -124,11 +124,15 @@ The SFTP remote supports three authentication methods:
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* Key file
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* ssh-agent
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Key files should be unencrypted PEM-encoded private key files. For
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instance `/home/$USER/.ssh/id_rsa`.
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Key files should be PEM-encoded private key files. For instance `/home/$USER/.ssh/id_rsa`.
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Only unencrypted OpenSSH or PEM encrypted files are supported.
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If you don't specify `pass` or `key_file` then rclone will attempt to
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contact an ssh-agent.
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If you don't specify `pass` or `key_file` then rclone will attempt to contact an ssh-agent.
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You can also specify `key_use_agent` to force the usage of an ssh-agent. In this case
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`key_file` can also be specified to force the usage of a specific key in the ssh-agent.
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Using an ssh-agent is the only way to load encrypted OpenSSH keys at the moment.
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If you set the `--sftp-ask-password` option, rclone will prompt for a
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password when needed and no password has been configured.
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@ -204,7 +208,7 @@ SSH password, leave blank to use ssh-agent.
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#### --sftp-key-file
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Path to PEM-encoded private key file, leave blank to use ssh-agent.
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Path to PEM-encoded private key file, leave blank or set key-use-agent to use ssh-agent.
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- Config: key_file
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- Env Var: RCLONE_SFTP_KEY_FILE
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@ -223,6 +227,19 @@ in the new OpenSSH format can't be used.
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- Type: string
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- Default: ""
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#### --sftp-key-use-agent
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When set forces the usage of the ssh-agent.
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When key-file is also set, the ".pub" file of the specified key-file is read and only the associated key is
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requested from the ssh-agent. This allows to avoid `Too many authentication failures for *username*` errors
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when the ssh-agent contains many keys.
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- Config: key_use_agent
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- Env Var: RCLONE_SFTP_KEY_USE_AGENT
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- Type: bool
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- Default: false
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#### --sftp-use-insecure-cipher
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Enable the use of the aes128-cbc cipher. This cipher is insecure and may allow plaintext data to be recovered by an attacker.
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