背景

云平台https的域名服务器如果超过上百条，如果都分布在不同的服务器或者负载均衡上，如果即将过期， 做完替换SSL证书动作后，如何批量检查域名的SSL证书是否替换网站，可通过如下脚本实现。

Python脚本

保存domain-ssl-check.py文件内容如下：

#!/usr/bin/env python3  

import ssl, socket  
import requests  
from dateutil import parser  
import pytz  

requests.packages.urllib3.disable_warnings()  

try:  
    _create_unverified_https_context = ssl._create_unverified_context  
except AttributeError:  
    # Legacy Python that doesn't verify HTTPS certificates by default  
    pass  
else:  
    # Handle target environment that doesn't support HTTPS verification  
    ssl._create_default_https_context = _create_unverified_https_context  

def get_domain_content(domain):  
    requests.packages.urllib3.disable_warnings()  
    url = 'https://' + domain  
    response = requests.get(url, verify=False).headers  
    print(response)  

def get_my_domain(mydomain):  
    try:  
        socket.setdefaulttimeout(5)  
        my_addr = socket.getaddrinfo(mydomain, None)  
        c = ssl.create_default_context()  
        s = c.wrap_socket(socket.socket(), server_hostname=mydomain)  
        s.connect((mydomain, 443))  
        my_cert = s.getpeercert()  
        get_my_cert_dated(mydomain, my_cert, my_addr)  
    except ssl.CertificateError and socket.gaierror as e:  
        pass  

def get_my_cert_dated(domain, certs, my_addr):  
    cert_beginning_time = parser.parse(certs['notBefore']).astimezone(pytz.utc)  
    cert_end_time = parser.parse(certs['notAfter']).astimezone(pytz.utc)  

    print('域名:(%s)  证书失效时间: %s' % (domain,  cert_end_time))  

def read_domain_files():  
    with open('./domain.txt', 'r',  
              encoding="utf-8") as file:  
        for domain in file:  
            try:  
                get_my_domain(domain.strip())  
            except Exception as e:  
                print('域名: (%s)-%s' %(domain.strip(), e))  

if __name__ == "__main__":  
    read_domain_files()  

使用方法

准备domain.txt一个域名一行，可从DNS导出记录

cat > domain.txt << EOF  
linuxeye.com  
www.linuxeye.com  
oneinstack.com  
www.linuxeye.com  
EOF  

执行：

python3 domain-ssl-check.py

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