sshd_config 一致ルールはターゲットホストをキャプチャします。

外部IPがワイルドカードと一致するDNSを持つSSH用のジャンプボックスサーバーがあります。つまり、その構造を持つすべてのアドレスは、*.mydomain.comジャンプボックスIPと同じIPアドレスになります。

私がやろうとしているのは、ユーザーとホストの条件に合ったルールを使用して内部コンピュータへの接続を中継することです。

これまで、私はユーザー標準に従ってこれを行いました。つまり、特定のユーザーを使用すると、Jumpbox の SSH は接続を自分の内部コンピュータに中継します。

一致ルールは次のとおりです。

Match User myuser
  ForceCommand ssh -i /home/someuser/.ssh/global-rsa myuser@internalmachine $SSH_ORIGINAL_COMMAND

これはユーザーがタスクを実行するときにうまく機能しますが、ここにホストを追加すると次のようになります。ssh [email protected]

Match User myuser Host usermachine.dev1.mydomain.com
  ForceCommand ssh -i /home/myuser/.ssh/global-rsa myuser@internalmachine $SSH_ORIGINAL_COMMAND

一致ルールを完全に無視します。

アイデアは、システムごとに異なるユーザー名を使用するのではなく、このユーザーが要求した特定のシステムにルーティングすることです。

追加後：UseDNS yesこれを行うと、次のようになります。ssh [email protected] -vvv

OpenSSH_7.4p1 Debian-10+deb9u6, OpenSSL 1.0.2r  26 Feb 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "usermachine.dev1.mydomain.com" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to usermachine.dev1.mydomain.com [xx.xx.xx.xx] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/myuser/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u6
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Debian-10+deb9u6
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u6 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to usermachine.dev1.mydomain.com:22 as 'myuser'
debug3: hostkeys_foreach: reading file "/home/myuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/myuser/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from usermachine.dev1.mydomain.com
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:eqPQ2fPZ9tVXyJ2me5VdBaHPHI9avXYUJjIETGmFTlM
debug3: hostkeys_foreach: reading file "/home/myuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/myuser/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from usermachine.dev1.mydomain.com
debug3: hostkeys_foreach: reading file "/home/myuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/myuser/.ssh/known_hosts:4
debug3: load_hostkeys: loaded 1 keys from xx.xx.xx.xx
debug1: Host 'usermachine.dev1.mydomain.com' is known and matches the ECDSA host key.
debug1: Found key in /home/myuser/.ssh/known_hosts:3
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/myuser/.ssh/id_rsa ((nil))
debug2: key: /home/myuser/.ssh/id_dsa ((nil))
debug2: key: /home/myuser/.ssh/id_ecdsa ((nil))
debug2: key: /home/myuser/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/myuser/.ssh/id_rsa
debug3: no such identity: /home/myuser/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/myuser/.ssh/id_dsa
debug3: no such identity: /home/myuser/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/myuser/.ssh/id_ecdsa
debug3: no such identity: /home/myuser/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/myuser/.ssh/id_ed25519
debug3: no such identity: /home/myuser/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (password).
Authenticated to usermachine.dev1.mydomain.com ([xx.xx.xx.xx]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 91
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env LS_COLORS
debug3: Ignored env SSH_CONNECTION
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env USER
debug3: Ignored env PWD
debug3: Ignored env HOME
debug3: Ignored env SSH_CLIENT
debug3: Ignored env SSH_TTY
debug3: Ignored env MAIL
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env SHLVL
debug3: Ignored env LOGNAME
debug3: Ignored env PATH
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Linux jumpbox-6ff6b97487-6x5mg 4.14.89+ #1 SMP Wed Jan 9 13:35:00 PST 2019 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Apr 10 12:35:19 2019 from 10.16.0.110
myuser@jumpbox-6ff6b97487-6x5mg:~$