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通过 SSH 建立隧道

tag-icon • tag-icon linux ssh centos tunnel
通过 SSH 建立隧道

我有一台运行 CentOS 6.5 的 VPS 服务器，还有一台运行 CentOS 6.5 的客户端

我正在尝试通过 SSH 协议建立隧道连接。

我使用 -v 选项进行调试，我找不到任何问题，但我无法建立隧道。另外，如果您在调试中发现任何安全问题，请告诉我。

ssh -vfN [email protected] -p 3032 -L 8182:127.0.0.1:22

[root@localhost ~]# ssh -vfN [email protected] -p 3032 -L 8182:127.0.0.1:22
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 198.23.xxx.xxx [198.23.xxx.xxx] port 3032.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/identity type -1
debug1: identity file /root/.ssh/identity-cert type -1
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '[198.23.xxx.xxx]:3032' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/identity
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Next authentication method: password
[email protected]'s password: 
debug1: Authentication succeeded (password).
debug1: Local connections to LOCALHOST:8182 forwarded to remote address 127.0.0.1:22
debug1: Local forwarding listening on ::1 port 8182.
bind: Address already in use
debug1: Local forwarding listening on 127.0.0.1 port 8182.
bind: Address already in use
channel_setup_fwd_listener: cannot listen to port: 8182
Could not request local forwarding.
debug1: Requesting [email protected]
debug1: Entering interactive session.

答案1

debug1: Local forwarding listening on ::1 port 8182. 
bind: Address already in use
debug1: Local forwarding listening on 127.0.0.1 port 8182.
bind: Address already in use

这意味着您已经将一些进程绑定到本地环回上的端口 8182。

可能是您尝试过的其他方法。阅读

$ man netstat

寻找找出哪个过程是罪魁祸首的几种方法之一。

如果要将多个隧道绑定到本地环回，可以绑定到其他端口号或者您可以绑定到其他 IP 地址。因为任何以 开头的地址lo的网络掩码都可以。255.0.0.0127.

$ ssh -vfN [email protected] -p 3032 -L 127.0.0.2:8182:127.0.0.1:22

如果您在调试中发现任何安全问题，请告诉我。

好吧，这对你的 ssh 来说不是问题，但你将你的 OpenSSH 链接到了容易受到 heartbleed 攻击的 OpenSSL（OpenSSL 1.0.1e-fips）。如果你已经链接了任何其他程序做使用它的 TLS 协议实现，可能建议对其进行修补并更新密钥材料。

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