ssh

ssh

SSH and SFTP client for Flutter. Wraps iOS library NMSSH and Android library JSch.

Installation

Add ssh as a dependency in your pubspec.yaml file.

Known issue

• Platform exception in release mode for Android:

  PlatformException(connection_failure, java.lang.ClassNotFoundException: com.jcraft.jsch.jce.Random, null)
  

  There are 2 workarounds:

  • Disable shrink:

    flutter build apk --no-shrink

  • Configure proguard-rules. Refer to this comment for details.

Usage

Create a client using password authentication

import 'package:ssh/ssh.dart';

var client = new SSHClient(
  host: "my.sshtest",
  port: 22,
  username: "sha",
  passwordOrKey: "Password01.",
);

Create a client using public key authentication

import 'package:ssh/ssh.dart';

var client = new SSHClient(
  host: "my.sshtest",
  port: 22,
  username: "sha",
  passwordOrKey: {
    "privateKey": """-----BEGIN RSA PRIVATE KEY-----
    ......
-----END RSA PRIVATE KEY-----""",
    "passphrase": "passphrase-for-key",
  },
);

OpenSSH keys

Recent versions of OpenSSH introduce a proprietary key format that is not supported by most other software, including this one, you must convert it to a PEM-format RSA key using the puttygen tool. On Windows this is a graphical tool. On the Mac, install it per these instructions. On Linux install your distribution's putty or puttygen packages.

• Temporarily remove the passphrase from the original key (enter blank password as the new password)
  ssh-keygen -p -f id_rsa
• convert to RSA PEM format
  puttygen id_rsa -O private-openssh -o id_rsa_unencrypted
• re-apply the passphrase to the original key
  ssh-keygen -p -f id_rsa
• apply a passphrase to the converted key:
  puttygen id_rsa_unencrypted -P -O private-openssh -o id_rsa_flutter
• remove the unencrypted version:
  rm id_rsa_unencrypted

Connect client

await client.connect();

Close client

await client.disconnect();

Execute SSH command

var result = await client.execute("ps");

Shell

Start shell:

• Supported ptyType: vanilla, vt100, vt102, vt220, ansi, xterm

var result = await client.startShell(
  ptyType: "xterm", // defaults to vanilla
  callback: (dynamic res) {
    print(res);     // read from shell
  }
);

Write to shell:

await client.writeToShell("ls\n");

Close shell:

await client.closeShell();

SFTP

Connect SFTP:

await client.connectSFTP();

List directory:

var array = await client.sftpLs("/home"); // defaults to .

Create directory:

await client.sftpMkdir("testdir");

Rename file or directory:

await client.sftpRename(
  oldPath: "testfile",
  newPath: "newtestfile",
);

Remove directory:

await client.sftpRmdir("testdir");

Remove file:

await client.sftpRm("testfile");

Download file:

var filePath = await client.sftpDownload(
  path: "testfile",
  toPath: tempPath,
  callback: (progress) {
    print(progress); // read download progress
  },
);

// Cancel download:
await client.sftpCancelDownload();

Upload file:

await client.sftpUpload(
  path: filePath,
  toPath: ".",
  callback: (progress) {
    print(progress); // read upload progress
  },
);

// Cancel upload:
await client.sftpCancelUpload();

Close SFTP:

await client.disconnectSFTP();

Demo

Refer to the example.