261 lines
8.6 KiB
Bash
261 lines
8.6 KiB
Bash
#!/bin/bash
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# SSH密钥部署及安全加固脚本
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# 功能：
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# 1. 自动生成SSH密钥对（默认密码：88888888）
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# 2. 部署公钥到多台服务器
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# 3. 安全加固：禁用密码登录（仅在所有密钥部署验证成功后）
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# 4. 提供回滚机制防止锁定
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# 配置参数
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KEY_DIR="$HOME/.ssh" # 密钥存放目录
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KEY_NAME="auto_key" # 密钥名称
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KEY_PASSWORD="88888888" # 固定密钥密码
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KEY_TYPE="ed25519" # 默认使用更安全的Ed25519算法
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SSH_PORT="22" # 默认SSH端口
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TEMP_BACKUP="/tmp/ssh_backup" # 临时备份目录
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LOCKFILE="/tmp/ssh_secure.lock" # 安全操作锁文件
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# 颜色定义
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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BLUE='\033[0;34m'
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NC='\033[0m' # No Color
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# 检查并安装依赖
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install_deps() {
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local deps=(ssh-keygen ssh sshpass expect)
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local missing=()
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for dep in "${deps[@]}"; do
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if ! command -v "$dep" &>/dev/null; then
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missing+=("$dep")
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fi
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done
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if [ ${#missing[@]} -gt 0 ]; then
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echo -e "${YELLOW}正在安装依赖: ${missing[*]}${NC}"
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if command -v apt-get &>/dev/null; then
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apt-get update -qq && apt-get install -y -qq "${missing[@]}" >/dev/null || {
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echo -e "${RED}依赖安装失败${NC}"; return 1
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}
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elif command -v yum &>/dev/null; then
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yum install -y -q "${missing[@]}" >/dev/null || {
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echo -e "${RED}依赖安装失败${NC}"; return 1
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}
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else
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echo -e "${RED}不支持的包管理器，请手动安装: ${missing[*]}${NC}"
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return 1
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fi
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fi
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return 0
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}
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# 生成SSH密钥
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generate_key() {
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echo -e "${BLUE}正在生成${NC} ${YELLOW}${KEY_TYPE}${NC} ${BLUE}类型SSH密钥...${NC}"
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[ -d "$KEY_DIR" ] || mkdir -p "$KEY_DIR"
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chmod 700 "$KEY_DIR"
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ssh-keygen -t "$KEY_TYPE" -C "auto-deploy-key" -N "$KEY_PASSWORD" -f "${KEY_DIR}/${KEY_NAME}" -q || {
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echo -e "${RED}密钥生成失败${NC}"; return 1
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}
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chmod 600 "${KEY_DIR}/${KEY_NAME}"
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chmod 644 "${KEY_DIR}/${KEY_NAME}.pub"
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echo -e "${GREEN}密钥生成成功:${NC}"
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echo -e "私钥: ${KEY_DIR}/${KEY_NAME}"
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echo -e "公钥: ${KEY_DIR}/${KEY_NAME}.pub"
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return 0
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}
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# 测试密钥登录
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test_key_login() {
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local server="$1"
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local user="${2:-root}"
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echo -e "${BLUE}测试密钥登录 ${user}@${server}...${NC}"
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if ! ssh -i "${KEY_DIR}/${KEY_NAME}" -o PasswordAuthentication=no -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
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"${user}@${server}" "echo -n" >/dev/null 2>&1; then
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echo -e "${RED}密钥登录测试失败 - ${user}@${server}${NC}"
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return 1
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fi
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echo -e "${GREEN}密钥登录测试成功 - ${user}@${server}${NC}"
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return 0
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}
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# 部署公钥到服务器
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deploy_key() {
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local server="$1"
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local user="${2:-root}"
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local port="${3:-22}"
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echo -e "${BLUE}正在部署到 ${user}@${server}:${port}...${NC}"
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# 备份原authorized_keys
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sshpass -p "$KEY_PASSWORD" ssh -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"[ -f ~/.ssh/authorized_keys ] && cp ~/.ssh/authorized_keys ~/.ssh/authorized_keys.bak" 2>/dev/null
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# 部署新密钥
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if ! sshpass -p "$KEY_PASSWORD" ssh -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"mkdir -p ~/.ssh && chmod 700 ~/.ssh && \
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grep -q \"\$(cat ${KEY_DIR}/${KEY_NAME}.pub)\" ~/.ssh/authorized_keys 2>/dev/null || \
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cat ${KEY_DIR}/${KEY_NAME}.pub >> ~/.ssh/authorized_keys && \
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chmod 600 ~/.ssh/authorized_keys" 2>/dev/null; then
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echo -e "${RED}公钥部署失败 - ${user}@${server}${NC}"
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return 1
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fi
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# 验证部署
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if ! test_key_login "$server" "$user"; then
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echo -e "${RED}部署验证失败 - ${user}@${server}${NC}"
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# 尝试回滚
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sshpass -p "$KEY_PASSWORD" ssh -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"[ -f ~/.ssh/authorized_keys.bak ] && mv -f ~/.ssh/authorized_keys.bak ~/.ssh/authorized_keys" 2>/dev/null
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return 1
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fi
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echo -e "${GREEN}成功部署到 ${user}@${server}${NC}"
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return 0
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}
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# 安全加固 - 禁用密码登录
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secure_server() {
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local server="$1"
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local user="${2:-root}"
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local port="${3:-22}"
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# 创建锁文件防止重复操作
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touch "$LOCKFILE"
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echo -e "${YELLOW}正在安全加固 ${user}@${server}...${NC}"
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# 备份原sshd配置
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ssh -i "${KEY_DIR}/${KEY_NAME}" -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak" || {
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echo -e "${RED}配置备份失败 - ${user}@${server}${NC}"; return 1
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}
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# 修改配置禁用密码登录
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ssh -i "${KEY_DIR}/${KEY_NAME}" -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"sudo sed -i 's/^#*PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config && \
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sudo sed -i 's/^#*PermitRootLogin.*/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config && \
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sudo systemctl reload sshd" || {
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echo -e "${RED}安全配置失败 - ${user}@${server}${NC}"
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# 尝试回滚
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ssh -i "${KEY_DIR}/${KEY_NAME}" -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"sudo mv -f /etc/ssh/sshd_config.bak /etc/ssh/sshd_config && sudo systemctl reload sshd" 2>/dev/null
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return 1
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}
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# 二次验证
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if ! test_key_login "$server" "$user"; then
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echo -e "${RED}安全加固后验证失败 - 正在回滚${NC}"
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ssh -i "${KEY_DIR}/${KEY_NAME}" -o StrictHostKeyChecking=no -p "$port" "${user}@${server}" \
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"sudo mv -f /etc/ssh/sshd_config.bak /etc/ssh/sshd_config && sudo systemctl reload sshd" 2>/dev/null
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return 1
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fi
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echo -e "${GREEN}安全加固成功 - ${user}@${server}${NC}"
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return 0
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}
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# 显示帮助
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show_help() {
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echo -e "${BLUE}使用说明:${NC}"
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echo "1. 仅生成密钥: $0"
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echo "2. 生成并部署到服务器: $0 [用户名] 服务器1 [服务器2 ...] [端口]"
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echo -e "\n${YELLOW}示例:${NC}"
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echo "生成密钥: $0"
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echo "部署到多台服务器: $0 root server1.example.com server2.example.com 22"
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}
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# 主函数
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main() {
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# 检查root权限
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if [ "$(id -u)" -ne 0 ]; then
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echo -e "${RED}请使用root用户运行此脚本${NC}"
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exit 1
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fi
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# 安装依赖
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install_deps || exit 1
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# 生成密钥
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generate_key || exit 1
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# 如果没有提供服务器参数，则只生成密钥
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if [ $# -eq 0 ]; then
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echo -e "${GREEN}SSH密钥已生成，但没有指定部署服务器${NC}"
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show_help
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exit 0
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fi
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# 解析参数
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local user="root"
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local servers=()
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local port="22"
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# 第一个参数可能是用户名
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if [[ "$1" != *.* ]] && [[ "$1" != *:* ]] && [[ "$1" != "root" ]]; then
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user="$1"
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shift
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fi
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# 最后一个参数可能是端口号
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if [[ "${@: -1}" =~ ^[0-9]+$ ]]; then
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port="${@: -1}"
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servers=("${@:1:$#-1}")
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else
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servers=("$@")
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fi
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# 部署到所有服务器
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local all_success=true
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for server in "${servers[@]}"; do
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deploy_key "$server" "$user" "$port" || {
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all_success=false
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echo -e "${RED}${server} 部署失败，跳过安全加固${NC}"
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continue
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}
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done
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# 只有所有服务器都部署成功才进行安全加固
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if $all_success; then
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echo -e "${YELLOW}所有服务器部署成功，开始安全加固...${NC}"
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for server in "${servers[@]}"; do
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secure_server "$server" "$user" "$port" || {
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echo -e "${RED}${server} 安全加固失败${NC}"
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all_success=false
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}
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done
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fi
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# 清理锁文件
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rm -f "$LOCKFILE"
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# 最终状态报告
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if $all_success; then
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echo -e "\n${GREEN}所有操作成功完成!${NC}"
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echo -e "${YELLOW}重要信息:${NC}"
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echo -e "密钥位置: ${KEY_DIR}/${KEY_NAME}"
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echo -e "密钥密码: ${KEY_PASSWORD}"
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echo -e "已禁用密码登录的服务器: ${servers[*]}"
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echo -e "\n${BLUE}您现在可以使用密钥登录这些服务器:${NC}"
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echo "ssh -i ${KEY_DIR}/${KEY_NAME} ${user}@服务器地址 -p ${port}"
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else
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echo -e "\n${RED}部分操作失败，请检查上述错误信息${NC}"
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echo -e "${YELLOW}注意: 未成功加固的服务器仍允许密码登录${NC}"
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exit 1
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fi
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}
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# 执行主函数
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main "$@"
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