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无法在 Bash 脚本中使用变量替换 SSH KeyFile 和 SSH_Username

tag-icon • tag-icon bash ssh ssh-agent
无法在 Bash 脚本中使用变量替换 SSH KeyFile 和 SSH_Username

我在 ubuntu 20.04 上，我正在运行一个 bash 脚本，我想将其移植到我的其他服务器上，但我无法同时用变量替换身份文件和 ssh_username，否则会出现 pubkey 错误。

首先我用来shellcheck.net验证我的基本语法是否正确

#!/bin/bash
source_ssh_user="admin"
source_ssh_host="123.456.789.12"
connecting_keyfile="/home/username/.ssh/id_my_rsa"


#this does NOT work, but it should:

ssh -i $connecting_keyfile $source_ssh_user@$source_ssh_host

当我将-vvv标志添加到命令时，它会验证是否向服务器提供了正确的 ssh 密钥文件：

...
...
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred 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: Offering public key: /home/username/.ssh/id_my_rsa RSA SHA256:UXXXXXXXXUx/w1dY explicit agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug1: Offering public key: /home/username/.ssh/id_my_rsa RSA SHA256:UGKOXXXXXXXXXx/w1dY explicit
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
[email protected]: Permission denied (publickey).

奇怪之处：

当我用这个命令替换上面的命令时，明确定义用户名，那么相同的密钥文件变量就可以完美运行

ssh -p22 -i $connecting_keyfile username@$source_ssh_host

问题：

似乎当我用变量替换 ssh_username 时，管理我的密码的 ssh-agent 不知何故失去了发送密码凭证的能力

为了管理我的密码，我在 .bashrc 中有以下内容：

#Add passphrase to ssh-agent
SSH_ENV="$HOME/.ssh/agent-environment"

function start_agent {
    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
    chmod 600 "${SSH_ENV}"
    . "${SSH_ENV}" > /dev/null
}

if [ -f "${SSH_ENV}" ]; then
    . "${SSH_ENV}" > /dev/null
    #ps ${SSH_AGENT_PID} doesn't work under cywgin
    ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
        start_agent;
    }
else
    start_agent;
fi

这在我的~/.ssh/config


Host *
    AddKeysToAgent yes
    User username
    Port 22
    IdentityFile /home/username/.ssh/id_my_rsa

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