我有一组 Bash 脚本，用于通过中间服务器建立从本地计算机到远程服务器的 SSH 连接。本地脚本使用 socat 启动隧道，中间服务器脚本生成隧道，但在尝试通过 SSH 进入最终目的地时，我遇到了“权限被拒绝”错误。密码似乎不正确，但事实并非如此，而且似乎由于尝试使用凭据登录中间服务器而不是目标而出现此错误。
本地脚本.sh
#!/usr/bin/env bash
SERIAL="$1"
USER="$2"
PASSWORD="$3"
function launch_socat(){
serial="$1"
ssh-keygen -f "$HOME/.ssh/known_hosts" -R "[middleserver]:7778" &> /dev/null
ssh-keygen -f "$HOME/.ssh/known_hosts" -R "[middleservername]:7778" &> /dev/null
tmux kill-session -t opentunnel >& /dev/null
tmux new -d -s opentunnel
tmux send-keys -t opentunnel 'ssh defaultuser@middleserver' C-m
tmux send-keys -t opentunnel "sleep 2 && /home/defaultuser/middle-script.sh $serial" C-m
sleep 10
}
launch_socat "$SERIAL"
sshpass -p "$PASSWORD" ssh -o UserKnownHostsFile=/dev/null -o "StrictHostKeyChecking=no" "$USER"@middleserver -p 7778
中间脚本.sh
#!/usr/bin/env bash
set -e
p1=7779
p2=7778
ser=$1
server_addr=middleip
nohup socat TCP4-LISTEN:$p1,reuseaddr TCP4-LISTEN:$p2,reuseaddr &
sleep 1
mosquitto_pub -h mymqtt -p mqttport -t "mymqttcommand/$ser/0/command/run_script" -u 'mymqttuser' -P 'mymqttpassword' -m "ssh_tunnel_spawn $server_addr $p1" -d --cafile /etc/ssl/certs/ca-certificates.crt
我已经在中间服务器的 sshd 配置中打开了必要的端口并设置了密码验证，但问题仍然存在。
已进行的尝试：
验证了所提供密码的正确性。检查了目标服务器上远程用户的存在和权限。查看了 SSH 服务器日志以获取详细的错误信息，但没有帮助。
任何见解或建议都将不胜感激。谢谢。
编辑：客户端 ssh 详细日志
OpenSSH_8.9p1 Ubuntu-3ubuntu0.6, OpenSSL 3.0.2 15 Mar 2022
debug1: Reading configuration data /home/myuser/.ssh/config
debug1: /home/myuser/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to middleip [middleip] port 7778.
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: identity file /home/myuser/.ssh/id_ecdsa type -1
debug1: identity file /home/myuser/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/myuser/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/myuser/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/myuser/.ssh/id_ed25519 type -1
debug1: identity file /home/myuser/.ssh/id_ed25519-cert type -1
debug1: identity file /home/myuser/.ssh/id_ed25519_sk type -1
debug1: identity file /home/myuser/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/myuser/.ssh/id_xmss type -1
debug1: identity file /home/myuser/.ssh/id_xmss-cert type -1
debug1: identity file /home/myuser/.ssh/id_dsa type -1
debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.11
debug1: compat_banner: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.11 pat OpenSSH* compat 0x04000000
debug1: Authenticating to middleip:7778 as 'attempteduser'
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:OLuDWVmWtP16hBFSL8mX9Y08lFy8iPwmYtJX0wwSRzw
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: checking without port identifier
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
Warning: Permanently added '[middleip]:7778' (ED25519) to the list of known hosts.
debug1: ssh_packet_send2_wrapped: resetting send seqnr 3
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: ssh_packet_read_poll2: resetting read seqnr 3
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey in after 134217728 blocks
debug1: get_agent_identities: bound agent to hostkey
debug1: get_agent_identities: ssh_fetch_identitylist: agent contains no identities
debug1: Will attempt key: /home/myuser/.ssh/id_rsa rsa sha256
debug1: Will attempt key: /home/myuser/.ssh/id_ecdsa
debug1: Will attempt key: /home/myuser/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/myuser/.ssh/id_ed25519
debug1: Will attempt key: /home/myuser/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/myuser/.ssh/id_xmss
debug1: Will attempt key: /home/myuser/.ssh/id_dsa
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]>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,hostbased
debug1: Next authentication method: publickey
debug1: Offering public key: /home/myuser/.ssh/id_rsa rsa sha256
debug1: Authentications that can continue: publickey,password,hostbased
debug1: Trying private key: /home/myuser/.ssh/id_ecdsa
debug1: Trying private key: /home/myuser/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/myuser/.ssh/id_ed25519
debug1: Trying private key: /home/myuser/.ssh/id_ed25519_sk
debug1: Trying private key: /home/myuser/.ssh/id_xmss
debug1: Trying private key: /home/myuser/.ssh/id_dsa
debug1: Next authentication method: password
debug1: Authentications that can continue: publickey,password,hostbased
Permission denied, please try again.
中间服务器日志
Jan 17 08:15:14 my-middle-server sshd[1650086]: Connection from myip port 31093 on middleip port 7778 rdomain ""
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: Remote protocol version 2.0, remote software version OpenSSH_8.9p1 Ubuntu-3ubuntu0.6
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: match: OpenSSH_8.9p1 Ubuntu-3ubuntu0.6 pat OpenSSH* compat 0x04000000
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: permanently_set_uid: 112/65534 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: SSH2_MSG_KEXINIT sent [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: SSH2_MSG_KEXINIT received [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: kex: algorithm: curve25519-sha256 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: kex: host key algorithm: ssh-ed25519 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: resetting send seqnr 3 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: rekey out after 134217728 blocks [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: SSH2_MSG_NEWKEYS sent [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: Sending SSH2_MSG_EXT_INFO [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: expecting SSH2_MSG_NEWKEYS [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: resetting read seqnr 3 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: SSH2_MSG_NEWKEYS received [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: rekey in after 134217728 blocks [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: KEX done [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: userauth-request for user attempteduser service ssh-connection method none [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: attempt 0 failures 0 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: Invalid user attempteduser from myip port 31093
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: PAM: initializing for "attempteduser"
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: PAM: setting PAM_RHOST to "myip"
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: PAM: setting PAM_TTY to "ssh"
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: userauth-request for user attempteduser service ssh-connection method publickey [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: attempt 1 failures 0 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: userauth_pubkey: test pkalg rsa-sha2-512 pkblob rsa sha256 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: userauth-request for user attempteduser service ssh-connection method password [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: debug1: attempt 2 failures 1 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650086]: pam_unix(sshd:auth): check pass; user unknown
Jan 17 08:15:14 my-middle-server sshd[1650086]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=myip
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: Remote protocol version 2.0, remote software version Go
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: no match: Go
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: permanently_set_uid: 112/65534 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: SSH2_MSG_KEXINIT sent [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: SSH2_MSG_KEXINIT received [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: kex: algorithm: curve25519-sha256 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jan 17 08:15:14 my-middle-server sshd[1650085]: debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: rekey out after 4294967296 blocks [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: SSH2_MSG_NEWKEYS sent [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: Sending SSH2_MSG_EXT_INFO [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: expecting SSH2_MSG_NEWKEYS [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: SSH2_MSG_NEWKEYS received [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: rekey in after 4294967296 blocks [preauth]
Jan 17 08:15:15 my-middle-server sshd[1650085]: debug1: KEX done [preauth]
Jan 17 08:15:16 my-middle-server sshd[1650085]: debug1: userauth-request for user root service ssh-connection method none [preauth]
Jan 17 08:15:16 my-middle-server sshd[1650085]: debug1: attempt 0 failures 0 [preauth]
Jan 17 08:15:16 my-middle-server sshd[1650085]: debug1: PAM: initializing for "root"
Jan 17 08:15:16 my-middle-server sshd[1650085]: debug1: PAM: setting PAM_RHOST to "anotherip"
Jan 17 08:15:16 my-middle-server sshd[1650085]: debug1: PAM: setting PAM_TTY to "ssh"
Jan 17 08:15:16 my-middle-server sshd[1650086]: debug1: PAM: password authentication failed for an illegal user: Authentication failure
Jan 17 08:15:16 my-middle-server sshd[1650086]: Failed password for invalid user attempteduser from myip port 31093 ssh2
Jan 17 08:15:17 my-middle-server sshd[1650086]: Connection closed by invalid user attempteduser myip port 31093 [preauth]