99 lines
2.9 KiB
Bash
99 lines
2.9 KiB
Bash
test@tn01:~$ cat setup_ssh_nopass.sh
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#!/usr/bin/env bash
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set -Eeuo pipefail
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usage() {
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cat <<'USAGE'
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用法:
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setup_ssh_nopass.sh [-u 远端用户] [-p 端口] [-k 私钥路径] 主机
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或者:
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setup_ssh_nopass.sh 用户@主机 [-p 端口] [-k 私钥路径]
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示例:
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setup_ssh_nopass.sh -u root -p 22 192.168.1.10
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setup_ssh_nopass.sh alice@server.example.com
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USAGE
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}
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REMOTE_USER="${USER}"
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PORT=22
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KEY_PATH="${HOME}/.ssh/id_ed25519"
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# 解析形如 user@host 的参数
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parse_user_host() {
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local s="$1"
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if [[ "$s" == *"@"* ]]; then
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REMOTE_USER="${s%@*}"
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HOST="${s#*@}"
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else
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HOST="$s"
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fi
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}
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# 参数
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while getopts ":u:p:k:h" opt; do
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case "$opt" in
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u) REMOTE_USER="$OPTARG" ;;
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p) PORT="$OPTARG" ;;
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k) KEY_PATH="$OPTARG" ;;
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h) usage; exit 0 ;;
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\?) echo "未知选项: -$OPTARG" >&2; usage; exit 2 ;;
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:) echo "选项 -$OPTARG 需要参数" >&2; usage; exit 2 ;;
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esac
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done
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shift $((OPTIND-1))
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[[ $# -ge 1 ]] || { usage; exit 2; }
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parse_user_host "$1"
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# 生成密钥（若不存在）
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if [[ ! -f "$KEY_PATH" ]]; then
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mkdir -p "$(dirname "$KEY_PATH")"
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ssh-keygen -t ed25519 -a 100 -N "" \
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-C "${USER}@$(hostname -f 2>/dev/null || hostname)-$(date +%Y%m%d)" \
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-f "$KEY_PATH"
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fi
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chmod 600 "$KEY_PATH" || true
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PUB_KEY_CONTENT="$(cat "${KEY_PATH}.pub")"
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PUB_KEY_B64="$(base64 -w0 2>/dev/null < "${KEY_PATH}.pub" || base64 < "${KEY_PATH}.pub" | tr -d '\n')"
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# 可选：预先抓取远端主机指纹，避免交互确认（注意：生产环境请先核对指纹！）
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mkdir -p "${HOME}/.ssh"
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touch "${HOME}/.ssh/known_hosts"
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if command -v ssh-keyscan >/dev/null 2>&1; then
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ssh-keyscan -p "$PORT" -H "$HOST" >> "${HOME}/.ssh/known_hosts" 2>/dev/null || true
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fi
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# 把公钥追加到远端 authorized_keys（去重、修权限、SELinux 兼容）
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ssh -p "$PORT" "${REMOTE_USER}@${HOST}" bash -s <<'REMOTE' "$PUB_KEY_B64"
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set -Eeuo pipefail
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PUB_B64="$1"
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umask 077
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mkdir -p "$HOME/.ssh"
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touch "$HOME/.ssh/authorized_keys"
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chmod 700 "$HOME/.ssh"
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chmod 600 "$HOME/.ssh/authorized_keys"
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# 解码公钥并去重追加
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PUB_DEC="$(printf '%s' "$PUB_B64" | (base64 -d 2>/dev/null || openssl base64 -d))"
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if ! grep -qxF "$PUB_DEC" "$HOME/.ssh/authorized_keys"; then
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printf '%s\n' "$PUB_DEC" >> "$HOME/.ssh/authorized_keys"
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fi
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# SELinux 环境修复上下文（如有）
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command -v restorecon >/dev/null 2>&1 && restorecon -R "$HOME/.ssh" || true
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REMOTE
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# 自检免密是否生效
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if ssh -p "$PORT" -o BatchMode=yes -o PasswordAuthentication=no \
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"${REMOTE_USER}@${HOST}" 'echo OK' 2>/dev/null | grep -qx 'OK'; then
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echo "✅ 已配置免密：${REMOTE_USER}@${HOST}（端口 ${PORT}） 使用密钥 ${KEY_PATH}"
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else
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echo "⚠️ 看起来免密未生效。请检查远端 /etc/ssh/sshd_config 中的以下项："
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echo " PubkeyAuthentication yes"
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echo " AuthorizedKeysFile .ssh/authorized_keys"
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echo " （如果远端禁止密码登录，首次安装密钥需用其他方式复制过去）"
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exit 1
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fi
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