SSH 密钥一键配置脚本是一套用于简化 SSH 密钥配置过程的解决方案。使用它以上操作只需要一行命

bash <(curl -fsSL git.io/key.sh) -g P3TERX -d

语法及选项说明

bash <(curl -fsSL git.io/key.sh) [选项...] <参数>

• -o – 覆盖模式，必须写在最前面才会生效
• -g – 从 GitHub 获取公钥，参数为 GitHub 用户名
• -u – 从 URL 获取公钥，参数为 URL
• -f – 从本地文件获取公钥，参数为本地文件路径
• -p – 修改 SSH 端口，参数为端口号
• -d – 禁用密码登录

生成自己的公钥和私钥保存好之后，可以使用一键本脚本将公钥一键安装到各个VPS，自己只需要保存好私钥文件，那样登录所有的VPS都可以用这一个私钥了。等于一把钥匙开所有的锁，不用每把锁配一把钥匙了。非常的方便和安全！

使用方法

生成 SSH 密钥对

如果没有密钥需要先生成，执行以下命令后一路回车即可。

ssh-keygen -t ecdsa -b 521

TIPS： 此方法适用于 Win­dows 10 (1803后)的 Pow­er­Shell 或 WSL，Linux 发行版和 ma­cOS 自带的终端，但不仅限于这些环境。

 

科普： 521 位的 ECDSA 密钥比起 RSA 密钥更安全且验证速度更快。

操作完后会在 ~/.ssh 目录中生两个密钥文件，id_ecdsa 为私钥，id_ecdsa.pub 为公钥。公钥就是我们需要安装在远程主机上的。

科普：~符号代表用户主目录，俗称家目录。其路径与当前登陆的用户有关，在 Linux 中普通用户家目录的路径是/home/用户名，而 root 用户是/root。Win­dows 10 中路径是C:\Users\用户名。在 ma­cOS 中路径是/Users/用户名。

安装公钥

从 GitHub 获取公钥

在 GitHub 密钥管理页面 添加公钥，比如我的用户名是 P3TERX，那么在主机上输入以下命令即可：

bash <(curl -fsSL git.io/key.sh) -g P3TERX

从 URL 获取公钥

把公钥上传到网盘，通过网盘链接获取公钥：

bash <(curl -fsSL git.io/key.sh) -u 这里替换成秘钥直链

从本地文件获取公钥

通过 FTP 的方式把公钥传到 VPS 上，然后指定公钥路径：

bash <(curl -fsSL git.io/key.sh) -f ~/key.pub

覆盖模式

使用覆盖模式（-o）将覆盖 /.ssh/authorized_keys 文件，之前的密钥会被完全替换掉，选项必须写在最前面才会生效，比如：

bash <(curl -fsSL git.io/key.sh) -o -g P3TERX

或者

bash <(curl -fsSL git.io/key.sh) -og P3TERX

禁用密码登录

在确定使用密钥能正常登录后禁用密码登录：

bash <(curl -fsSL git.io/key.sh) -d

修改 SSH 端口

把 SSH 端口修改为 2222：

bash <(curl -fsSL git.io/key.sh) -p 2222

一键操作

安装密钥、修改端口、禁用密码登录一键操作：

bash <(curl -fsSL git.io/key.sh) -og P3TERX -p 2222 -d

项目地址：

P3TERX/SSH_Key_Installer：通过 GitHub、URL 或本地文件安装 SSH 密钥

脚本备份：

#!/usr/bin/env bash
#=============================================================
# https://github.com/P3TERX/SSH_Key_Installer
# Description: Install SSH keys via GitHub, URL or local files
# Version: 2.7
# Author: P3TERX
# Blog: https://p3terx.com
#=============================================================

VERSION=2.7
RED_FONT_PREFIX="\033[31m"
LIGHT_GREEN_FONT_PREFIX="\033[1;32m"
FONT_COLOR_SUFFIX="\033[0m"
INFO="[${LIGHT_GREEN_FONT_PREFIX}INFO${FONT_COLOR_SUFFIX}]"
ERROR="[${RED_FONT_PREFIX}ERROR${FONT_COLOR_SUFFIX}]"
[ $EUID != 0 ] && SUDO=sudo

USAGE() {
    echo "
SSH Key Installer $VERSION

Usage:
  bash <(curl -fsSL git.io/key.sh) [options...] <arg>

Options:
  -o	Overwrite mode, this option is valid at the top
  -g	Get the public key from GitHub, the arguments is the GitHub ID
  -u	Get the public key from the URL, the arguments is the URL
  -f	Get the public key from the local file, the arguments is the local file path
  -p	Change SSH port, the arguments is port number
  -d	Disable password login"
}

if [ $# -eq 0 ]; then
    USAGE
    exit 1
fi

get_github_key() {
    if [ "${KEY_ID}" == '' ]; then
        read -e -p "Please enter the GitHub account:" KEY_ID
        [ "${KEY_ID}" == '' ] && echo -e "${ERROR} Invalid input." && exit 1
    fi
    echo -e "${INFO} The GitHub account is: ${KEY_ID}"
    echo -e "${INFO} Get key from GitHub..."
    PUB_KEY=$(curl -fsSL https://github.com/${KEY_ID}.keys)
    if [ "${PUB_KEY}" == 'Not Found' ]; then
        echo -e "${ERROR} GitHub account not found."
        exit 1
    elif [ "${PUB_KEY}" == '' ]; then
        echo -e "${ERROR} This account ssh key does not exist."
        exit 1
    fi
}

get_url_key() {
    if [ "${KEY_URL}" == '' ]; then
        read -e -p "Please enter the URL:" KEY_URL
        [ "${KEY_URL}" == '' ] && echo -e "${ERROR} Invalid input." && exit 1
    fi
    echo -e "${INFO} Get key from URL..."
    PUB_KEY=$(curl -fsSL ${KEY_URL})
}

get_loacl_key() {
    if [ "${KEY_PATH}" == '' ]; then
        read -e -p "Please enter the path:" KEY_PATH
        [ "${KEY_PATH}" == '' ] && echo -e "${ERROR} Invalid input." && exit 1
    fi
    echo -e "${INFO} Get key from $(${KEY_PATH})..."
    PUB_KEY=$(cat ${KEY_PATH})
}

install_key() {
    [ "${PUB_KEY}" == '' ] && echo "${ERROR} ssh key does not exist." && exit 1
    if [ ! -f "${HOME}/.ssh/authorized_keys" ]; then
        echo -e "${INFO} '${HOME}/.ssh/authorized_keys' is missing..."
        echo -e "${INFO} Creating ${HOME}/.ssh/authorized_keys..."
        mkdir -p ${HOME}/.ssh/
        touch ${HOME}/.ssh/authorized_keys
        if [ ! -f "${HOME}/.ssh/authorized_keys" ]; then
            echo -e "${ERROR} Failed to create SSH key file."
        else
            echo -e "${INFO} Key file created, proceeding..."
        fi
    fi
    if [ "${OVERWRITE}" == 1 ]; then
        echo -e "${INFO} Overwriting SSH key..."
        echo -e "${PUB_KEY}\n" >${HOME}/.ssh/authorized_keys
    else
        echo -e "${INFO} Adding SSH key..."
        echo -e "\n${PUB_KEY}\n" >>${HOME}/.ssh/authorized_keys
    fi
    chmod 700 ${HOME}/.ssh/
    chmod 600 ${HOME}/.ssh/authorized_keys
    [[ $(grep "${PUB_KEY}" "${HOME}/.ssh/authorized_keys") ]] &&
        echo -e "${INFO} SSH Key installed successfully!" || {
        echo -e "${ERROR} SSH key installation failed!"
        exit 1
    }
}

change_port() {
    echo -e "${INFO} Changing SSH port to ${SSH_PORT} ..."
    if [ $(uname -o) == Android ]; then
        [[ -z $(grep "Port " "$PREFIX/etc/ssh/sshd_config") ]] &&
            echo -e "${INFO} Port ${SSH_PORT}" >>$PREFIX/etc/ssh/sshd_config ||
            sed -i "s@.*\(Port \).*@\1${SSH_PORT}@" $PREFIX/etc/ssh/sshd_config
        [[ $(grep "Port " "$PREFIX/etc/ssh/sshd_config") ]] && {
            echo -e "${INFO} SSH port changed successfully!"
            RESTART_SSHD=2
        } || {
            RESTART_SSHD=0
            echo -e "${ERROR} SSH port change failed!"
            exit 1
        }
    else
        $SUDO sed -i "s@.*\(Port \).*@\1${SSH_PORT}@" /etc/ssh/sshd_config && {
            echo -e "${INFO} SSH port changed successfully!"
            RESTART_SSHD=1
        } || {
            RESTART_SSHD=0
            echo -e "${ERROR} SSH port change failed!"
            exit 1
        }
    fi
}

disable_password() {
    if [ $(uname -o) == Android ]; then
        sed -i "s@.*\(PasswordAuthentication \).*@\1no@" $PREFIX/etc/ssh/sshd_config && {
            RESTART_SSHD=2
            echo -e "${INFO} Disabled password login in SSH."
        } || {
            RESTART_SSHD=0
            echo -e "${ERROR} Disable password login failed!"
            exit 1
        }
    else
        $SUDO sed -i "s@.*\(PasswordAuthentication \).*@\1no@" /etc/ssh/sshd_config && {
            RESTART_SSHD=1
            echo -e "${INFO} Disabled password login in SSH."
        } || {
            RESTART_SSHD=0
            echo -e "${ERROR} Disable password login failed!"
            exit 1
        }
    fi
}

while getopts "og:u:f:p:d" OPT; do
    case $OPT in
    o)
        OVERWRITE=1
        ;;
    g)
        KEY_ID=$OPTARG
        get_github_key
        install_key
        ;;
    u)
        KEY_URL=$OPTARG
        get_url_key
        install_key
        ;;
    f)
        KEY_PATH=$OPTARG
        get_loacl_key
        install_key
        ;;
    p)
        SSH_PORT=$OPTARG
        change_port
        ;;
    d)
        disable_password
        ;;
    ?)
        USAGE
        exit 1
        ;;
    :)
        USAGE
        exit 1
        ;;
    *)
        USAGE
        exit 1
        ;;
    esac
done

if [ "$RESTART_SSHD" = 1 ]; then
    echo -e "${INFO} Restarting sshd..."
    $SUDO systemctl restart sshd && echo -e "${INFO} Done."
elif [ "$RESTART_SSHD" = 2 ]; then
    echo -e "${INFO} Restart sshd or Termux App to take effect."
fi