# 2. 实施步骤
# 步骤1：部署防火墙
# 步骤2：优化防火墙规则
# 步骤3：优化连接跟踪
# 步骤4：验证防火墙性能

# 3. 应用效果
# 提高了防火墙的性能
# 减少了防火墙对系统性能的影响
# 提高了系统的安全性

# 部署防火墙
dnf install -y firewalld nftables

# 启动防火墙服务
systemctl start firewalld
systemctl enable firewalld
systemctl start nftables
systemctl enable nftables

# 优化防火墙规则
# 清理现有规则
firewall-cmd –flush

# 添加必要的规则
firewall-cmd –permanent –add-service=ssh
firewall-cmd –permanent –add-service=http
firewall-cmd –permanent –add-service=https

# 重新加载规则
firewall-cmd –reload

# 优化连接跟踪
cat > /etc/sysctl.d/firewall.conf << 'EOF' # 连接跟踪优化 net.netfilter.nf_conntrack_max = 65536 net.netfilter.nf_conntrack_tcp_timeout_established = 86400 net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120 net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60 net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120 EOF # 应用sysctl配置 sysctl -p /etc/sysctl.d/firewall.conf # 验证防火墙性能 # 测试防火墙吞吐量 iperf3 -s & iperf3 -c localhost -t 60 # 测试防火墙延迟 ping -c 10 localhost # 查看防火墙状态 firewall-cmd --state firewall-cmd --list-all

# 2. 实施步骤
# 步骤1：部署OpenSSL
# 步骤2：优化加密算法
# 步骤3：优化密钥管理
# 步骤4：验证加密性能

# 3. 应用效果
# 提高了加密性能
# 减少了加密对系统性能的影响
# 提高了系统的安全性

# 部署OpenSSL
dnf install -y openssl

# 优化加密算法
# 生成更安全的密钥
openssl genrsa -out server.key 2048

# 生成证书签名请求
openssl req -new -key server.key -out server.csr

# 生成自签名证书
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

# 优化OpenSSL配置
cat > /etc/pki/tls/openssl.cnf << 'EOF' [openssl_conf] ssl_conf = ssl_sect [ssl_sect] system_default = system_default_sect [system_default_sect] MinProtocol = TLSv1.2 CipherString = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256 EOF # 验证加密性能 # 测试SSL/TLS性能 openssl speed rsa2048 openssl speed ecdsa # 测试HTTPS性能 ab -n 1000 -c 100 https://localhost/ # 查看加密配置 openssl version openssl ciphers

# 2. 实施步骤
# 步骤1：部署安全监控
# 步骤2：优化监控配置
# 步骤3：优化审计规则
# 步骤4：验证监控性能

# 3. 应用效果
# 提高了安全监控的性能
# 减少了监控对系统性能的影响
# 提高了系统的安全性

# 部署安全监控
dnf install -y audit policycoreutils-python-utils

# 启动auditd服务
systemctl start auditd
systemctl enable auditd

# 优化auditd配置
cat > /etc/audit/auditd.conf << 'EOF' # # This file controls the configuration of the audit daemon # local_events = yes write_logs = yes log_file = /var/log/audit/audit.log log_group = root log_format = RAW flush = INCREMENTAL freq = 20 max_log_file = 8 num_logs = 5 priority_boost = 4 disp_qos = lossy dispatcher = /sbin/audispd name_format = NONE ##name = mydomain max_log_file_action = rotate space_left = 75 space_left_action = SYSLOG action_mail_acct = root disk_full_action = SUSPEND disk_error_action = SUSPEND ##tcp_listen_port = 60 ##tcp_listen_queue = 5 ##tcp_max_per_addr = 1 ##tcp_client_ports = 1024-65535 ##tcp_client_max_idle = 0 enable_krb5 = no krb5_principal = auditd ##krb5_key_file = /etc/audit/audit.key EOF # 优化审计规则 cat > /etc/audit/rules.d/audit.rules << 'EOF' # Log all attempts to alter time through adjtimex -a always,exit -F arch=b64 -S adjtimex -S settimeofday -k time-change # Log all attempts to alter the local time -a always,exit -F arch=b64 -S clock_settime -k time-change # Log file modifications -w /etc/passwd -p wa -k identity -w /etc/group -p wa -k identity -w /etc/shadow -p wa -k identity -w /etc/sudoers -p wa -k identity # Log system calls -a always,exit -F arch=b64 -S execve -k exec # Log network access -a always,exit -F arch=b64 -S connect -k network EOF # 重启auditd服务 systemctl restart auditd # 优化SELinux配置 # 查看SELinux状态 getenforce # 设置SELinux为enforcing模式 setenforce 1 # 优化SELinux策略 semanage port -a -t http_port_t -p tcp 8080 # 验证监控性能 # 查看auditd状态 systemctl status auditd # 查看审计日志 ausearch -m AVC,USER_LOGIN # 查看SELinux状态 sestatus # 测试系统性能 iostat -x 1 10 vmstat 1 10