ssh - OpenSSH - 是 ssh-agent 转发吗？

Question

我正在尝试调试 CPU 变高的 OpenSSH 问题。但在此之前，我想确认此连接是否使用了 SSH-Agent 转发功能。以下是分配了两个 channel 的子 SSH 服务器的核心转储。
channel [1] 似乎正在与 ssh-agent 交谈。

我需要以下帮助:

1) As I know ssh-agent talks to SSH client, however here it seems to be talking to SSH server. Can we say that we have ssh-agent forwarding in role?

2) What can I do to reproduce this scenario?

3) Anything else that you may want to kindly tell me about from the data given.

(gdb) p *channels[0]
      type = 0x4,
      self = 0x0,
      remote_id = 0x0,
      istate = 0x0,
      ostate = 0x3,
      flags = 0x0,
      rfd = 0xd,
      wfd = 0xffffffff,
      efd = 0xffffffff,
      sock = 0xffffffff,
      ctl_chan = 0xffffffff,
      isatty = 0x1,
      client_tty = 0x0,
      path = 0x0,
      listening_port = 0x0,
      listening_addr = 0x0,
      host_port = 0x0,
      remote_name = 0xb0f2e4a0 "server-session",
      ctype = 0x187df64 "session",
      open_confirm = 0,
      open_confirm_ctx = 0x0,
      detach_user = 0x1855650 <session_close_by_channel>,
      detach_close = 0x1,
    =============================
(gdb) p *channels[1]
      type = 0x6,
      self = 0x1,
      remote_id = 0xffffffff,
      istate = 0x0,
      ostate = 0x0,
      flags = 0x0,
      rfd = 0x9,
      wfd = 0x9,
      efd = 0xffffffff,
      sock = 0x9,
      ctl_chan = 0xffffffff,
      path = 0xb0f2e7a0 "/tmp/ssh-00015945aa/agent.15945",
      listening_port = 0x0,
      listening_addr = 0x0,
      host_port = 0x0,
      remote_name = 0xb0f2e720 "auth socket",
      ctype = 0x187d92c "auth socket"

Answer 1

1) As I know ssh-agent talks to SSH client, however here it seems to be talking to SSH server. Can we say that we have ssh-agent forwarding in role?

这是另一种方式。客户与代理交谈。如果您将套接字转发到服务器，则该服务器上的其他客户端可以与您计算机上的代理通信。

就这样。服务器具有转发身份验证套接字的唯一作用。

2) What can I do to reproduce this scenario?

开始ssh-agent和使用ssh -A server启动与代理转发的连接。

3) Anything else that you may want to kindly tell me about from the data given.

(gdb) p *channels[0]
  type = 0x4, /* SSH_CHANNEL_OPEN -- shell or command */

(gdb) p *channels[1]
  type = 0x6, /* SSH_CHANNEL_AUTH_SOCKET -- ssh-agent forwarding */

是的，那是代理转发。