# 创建登录密钥
ssh-keygen -t ed25519 -a 100 -f ~/.ssh/id_ed25519_linux_login

# 复制公钥到服务器
ssh-copy-id -i ~/.ssh/id_ed25519_linux_login.pub root@192.168.100.102

# 测试密钥登录
ssh -i ~/.ssh/id_ed25519_linux_login root@192.168.100.102

#!/bin/bash
[ "$EUID" -ne 0 ] && { echo "需要root权限"; exit 1; }

SSHD_CONFIG="/etc/ssh/sshd_config"

# 严格检查：文件必须存在
[ ! -f "$SSHD_CONFIG" ] && { echo "错误: $SSHD_CONFIG 不存在"; exit 1; }

# 清理旧配置
sed -i '/^\s*PasswordAuthentication\s/d' "$SSHD_CONFIG"
sed -i '/^\s*ChallengeResponseAuthentication\s/d' "$SSHD_CONFIG"
sed -i '/^\s*PubkeyAuthentication\s/d' "$SSHD_CONFIG"
sed -i '/^\s*UsePAM\s/d' "$SSHD_CONFIG"

echo >> "$SSHD_CONFIG"
echo '# 调整配置' >> "$SSHD_CONFIG"
# 追加安全配置
{
    echo "PasswordAuthentication no"
    echo "ChallengeResponseAuthentication no"
    echo "PubkeyAuthentication yes"
    echo "UsePAM yes"
} >> "$SSHD_CONFIG"