加密dns深度解析

sequenceDiagram
    Client->>DoH服务器: HTTPS POST /dns-query
    DoH服务器->>递归解析器: 标准DNS查询
    递归解析器->>DoH服务器: DNS响应
    DoH服务器->>Client: HTTPS 200 OK (DNS响应)

// Node.js DoT客户端示例
const tls = require('tls');
const dnsPacket = require('dns-packet');

const socket = tls.connect(853, 'dns.server.com', {
  servername: 'dns.server.com'
}, () => {
  const query = dnsPacket.encode({
    type: 'query',
    id: 1,
    questions: [{ type: 'A', name: 'example.com' }]
  });
  socket.write(query);
});

socket.on('data', (data) => {
  const response = dnsPacket.decode(data);
  console.log(response.answers);
});

# 查询最小化示例
def minimize_query(original_name):
    labels = original_name.split('.')
    for i in range(len(labels)):
        test_name = '.'.join(labels[i:])
        if is_zone_cut(test_name):  # 检查是否存在权限划分
            return test_name
    return original_name

# /etc/systemd/resolved.conf
[Resolve]
DNS=1.1.1.1
DNSOverTLS=yes

Set-DnsClientDohServerAddress -InterfaceIndex <ID> -ServerAddress "https://dns.server/dns-query"

graph TD
    A[客户端] -->|DoH/DoT| B(边缘代理)
    B --> C{策略引擎}
    C -->|允许| D[外部DoH]
    C -->|拦截| E[内部递归解析]
    E --> F[安全日志]

# DNS缓存服务器配置示例
options {
    forwarders {
        1.1.1.1;
        8.8.8.8;
    };
    forward only;
    max-cache-size 1G;
    prefetch 30 60;
};

// DNSSEC验证示例
func validateDNSSEC(msg *dns.Msg) bool {
    if msg.IsEdns0() == nil || !msg.AuthenticatedData {
        return false
    }
    // 实际验证逻辑...
    return true
}

# 策略示例
- action: ALLOW
  condition:
    - user: dev-team
    - device: corp-managed
    - query_type: !TXT