java - 使用 JSch 无需用户名或密码即可连接到服务器

Question

我正在使用 com.jcraft.jsch.JSch 创建 SFTP 连接。

我的 SSH key 已设置为无需用户名或密码即可直接 SSH 到服务器的位置。

ssh test_server

我的公钥位于 me@test_server:~/.ssh/ 的authorized_key 文件中
我本地计算机上的 SSH key 位于 C:\cygwin\home\me\.ssh\
此外，我在该目录中还有一个配置文件和一个 known_hosts 文件。

Host test_server
User user_name
HostName test_server.domain.com
ForwardAgent yes

为了仔细检查，我确保 C:\cygwin\home\me\.ssh 中的公钥位于远程服务器的 authorized_keys 文件中。

我正在开发一个创建文件的 GUI 程序。有了该文件，我希望能够将其存储在远程服务器上，并通过 SFTP 将其放置在该文件夹中。我怎样才能做到这一点？

这是我到目前为止所拥有的:

public static void main(String[] arg) {
    try {
        JSch jsch = new JSch();

        String user = "";
        String host = "test_server";
        int port = 22;
        String privateKey = "C:/cygwin/home/me/.ssh/id_rsa";

        jsch.addIdentity(privateKey);
        System.out.println("identity added ");

        Session session = jsch.getSession("", host);
        System.out.println("session created.");

        session.connect();
        System.out.println("session connected.....");

        Channel channel = session.openChannel("sftp");
        channel.setInputStream(System.in);
        channel.setOutputStream(System.out);
        channel.connect();
        System.out.println("shell channel connected....");

        ChannelSftp c = (ChannelSftp) channel;

        String fileName = "test.txt";
        c.put(fileName, "./in/");
        c.exit();
        System.out.println("done");

    } catch (Exception e) {
        System.err.println(e);
    }
}

我不断收到

com.jcraft.jsch.JSchException: Auth fail error.

有人知道这个问题的解决办法吗？

其他信息(这可能有用......不确定):
当我打开 cmd 时，它会将我带到 C:\Users\me。
但是当我传递“pwd”命令时，它会打印出 /cygdrive/c/Users/me。
我也对任何新的库持开放态度，或者也许只是一种更好的方法来做到这一点。

非常感谢!

ssh -v test_server 的输出:

OpenSSH_7.4p1, OpenSSL 1.0.2k  26 Jan 2017
debug1: Reading configuration data /home/me/.ssh/config
debug1: /home/me/.ssh/config line 1: Applying options for *
debug1: /home/me/.ssh/config line 9: Applying options for wmpos1
debug1: Control socket "/home/me/.ssh/master-user_name@test_server:22" d
oes not exist
debug1: Connecting to test_server [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/me/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/me/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.2
debug1: match: OpenSSH_6.2 pat OpenSSH* compat 0x04000000
debug1: Authenticating to test_server:22 as 'user_name'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: ecdh-sha2-nistp256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: aes128-ctr MAC: umac-64-etm@openssh.com comp
ression: none
debug1: kex: client->server cipher: aes128-ctr MAC: umac-64-etm@openssh.com comp
ression: none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:aV1o2Laclf7vRU2QOH+iWpuYYmy2
bokk8uQrVEaPL8k
debug1: Host 'test_server' is known and matches the ECDSA host key.
debug1: Found key in /home/me/.ssh/known_hosts:2
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/me/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 151
debug1: Authentication succeeded (publickey).
Authenticated to test_server ([127.0.0.1]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network

Answer 1

您没有在 ssh 命令行上显式指定用户名这一事实并不意味着不使用用户名。

默认情况下，ssh 隐式使用本地用户名。 JSch不会这样做。您必须显式指定用户名，即使它与本地用户名相同。