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ssh 配置多个代理跳转

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ssh 配置多个代理跳转

我有一个设置，我需要进行 2 次代理跳转才能连接到我的服务器D。实际上，从A，我需要连接到B，从 我需要连接到C（仅允许来自 的连接B）然后我可以连接到D（仅接受来自 的连接C）。

在 上B，使用 ssh 配置，我D只需输入即可连接到ssh D，这就是为什么我认为我可以使用此配置来A连接到D：

Host B
    hostname 127.0.0.1
    user myUser
    Port 43099
    IdentityFile ~/.ssh/id_rsa

Host D
    hostname D
    ProxyJump B

然后从A连接到D通过ssh D。

但是，这是我从中得到的错误：

debug1: Reading configuration data /home/MyUser/.ssh/config
debug1: /home/MyUser/.ssh/config line 17: Applying options for D
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Setting implicit ProxyCommand from ProxyJump: ssh -v -W '[%h]:%p' B
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Executing proxy command: exec ssh -v -W '[D]:22' B
debug1: Local version string SSH-2.0-OpenSSH_8.8
OpenSSH_8.8p1, OpenSSL 1.1.1m  14 Dec 2021
debug1: Reading configuration data /home/MyUser/.ssh/config
debug1: /home/MyUser/.ssh/config line 7: Applying options for B
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to 127.0.0.1 [127.0.0.1] port 43023.
debug1: Connection established.
debug1: identity file /home/MyUser/.ssh/id_rsa type 0
debug1: identity file /home/MyUser/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.6
debug1: compat_banner: match: OpenSSH_8.6 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 127.0.0.1:43023 as 'MyUser'
debug1: load_hostkeys: fopen /home/MyUser/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519 SHA256:to5+n56a6Zj+sbTnMghZGehX2OX5cn29HWbje55WJHU
debug1: load_hostkeys: fopen /home/MyUser/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host '[127.0.0.1]:43023' is known and matches the ED25519 host key.
debug1: Found key in /home/MyUser/.ssh/known_hosts:45
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /home/MyUser/.ssh/id_rsa RSA SHA256:d6hsPtnc6TWfm9j5lOClBzD4ylE+ww/tg9BE7qP8DlE explicit
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,[email protected],ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected]>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering public key: /home/MyUser/.ssh/id_rsa RSA SHA256:d6hsPtnc6TWfm9j5lOClBzD4ylE+ww/tg9BE7qP8DlE explicit
debug1: Server accepts key: /home/MyUser/.ssh/id_rsa RSA SHA256:d6hsPtnc6TWfm9j5lOClBzD4ylE+ww/tg9BE7qP8DlE explicit
Authenticated to 127.0.0.1 ([127.0.0.1]:43023) using "publickey".
debug1: channel_connect_stdio_fwd: D:22
debug1: channel 0: new [stdio-forward]
debug1: getpeername failed: Bad file descriptor
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug1: pledge: filesystem full
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug1: client_input_hostkeys: searching /home/MyUser/.ssh/known_hosts for [127.0.0.1]:43023 / (none)
debug1: client_input_hostkeys: searching /home/MyUser/.ssh/known_hosts2 for [127.0.0.1]:43023 / (none)
debug1: client_input_hostkeys: hostkeys file /home/MyUser/.ssh/known_hosts2 does not exist
debug1: client_input_hostkeys: host key found matching a different name/address, skipping UserKnownHostsFile update
debug1: Remote: /Users/Hendrik/.ssh/authorized_keys:3: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug1: Remote: /Users/Hendrik/.ssh/authorized_keys:3: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
channel 0: open failed: connect failed: nodename nor servname provided, or not known
stdio forwarding failed
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535

看起来 ssh 配置根本B没有被读取。

我的 ssh 配置B如下：


Host C
  HostName C
  User MyUser
  ForwardX11Trusted yes
  ForwardX11 yes

Host D
  User MyUser
  HostName D
  ProxyCommand ssh %r@C -W %h:22
  RemoteForward 26512 github.com:22
  Compression yes
  ForwardX11Trusted yes
  ForwardX11 yes
  DynamicForward 10080
  ControlMaster auto
  ControlPath ~/.ssh/masters/%C

有没有办法编辑 ssh 配置，A以便我可以从A到D进行连接ssh D？

答案1

使用代理跳转时，所有 ssh 连接都源自原始客户端（本例中为 A），中间节点只是隧道端点。因此，在您的情况下，所有配置（包括私钥文件）都需要位于 A 上，并且看起来像这样（假设您对所有 3 个主机使用相同的身份文件）：

Host B
    hostname 127.0.0.1
    user myUser
    Port 43099
    IdentityFile ~/.ssh/id_rsa
Host C
    ProxyJump B
    IdentityFile ~/.ssh/id_rsa
    # Any additional options for connecting to C
Host D
    ProxyJump C
    IdentityFile ~/.ssh/id_rsa
    # Any additional options for connecting to D

当你 时ssh D，A 上的 ssh 客户端将进行以下一系列 ssh 会话：

  1. A -> B（直接通过网络）
  2. A -> C（通过 A->B 连接进行隧道传输，然后直接通过网络从 B 传输到 C）
  3. A -> D（通过 A->C 连接（通过 A->B 建立隧道）进行隧道传输，然后直接通过网络从 C 传输到 D）

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