使用JSch连接到没有用户名或密码的服务器

Question

我正在使用com.jcraft.jsch.jsch创建一个SFTP连接。

我的SSH密钥被设置为可以直接SSH到服务器，而不需要用户名或密码。

ssh test_server

我的公钥在me@test_server:~/.SSH/中的authorized_key文件中
我在本地计算机上的SSH密钥在C:\cygwin\home\me\.SSH\
此外，我在此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

为了进行双重检查，我确保C:\cygwin\home\me\.ssh中的公钥在远程服务器的authorized_keys文件中。

我正在开发一个创建文件的GUI程序。有了这个文件，我希望能够将它存储在远程服务器上，并用SFTP将它放在那里的一个文件夹中。我怎么能做到这一点？

以下是我目前掌握的情况：

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);
    }
}

我一直收到一个

JSCHException：身份验证失败错误。

有人知道解决这个问题的办法吗？

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。
我还可以使用任何新库，或者更好的实现方法。

太感谢您了！

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: [e-mail] comp
ression: none
debug1: kex: client->server cipher: aes128-ctr MAC: [e-mail] 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 [e-mail]
debug1: Entering interactive session.
debug1: pledge: network

Answer 1

没有在ssh命令行上显式指定用户名这一事实并不意味着没有使用用户名。

ssh默认情况下隐式使用本地用户名。JSch不会那么做的。您必须显式指定用户名，即使它与本地用户名相同。