使用python檢查SSL證書到期情況

結合郵件告警和頁面展示，再多的域名證書到期情況即可立馬知道

代碼示例：

# coding: utf-8 
# 查詢域名證書到期情況

import re
import time
import subprocess
from datetime import datetime
from io import StringIO

def main(domain):
    f = StringIO()
    comm = f"curl -Ivs https://{domain} --connect-timeout 10"

    result = subprocess.getstatusoutput(comm)
    f.write(result[1])

    m = re.search('start date: (.*?)\n.*?expire date: (.*?)\n.*?common name: (.*?)\n.*?issuer: CN=(.*?)\n', f.getvalue(), re.S)
    start_date = m.group(1)
    expire_date = m.group(2)
    common_name = m.group(3)
    issuer = m.group(4)

    # time 字符串轉時間數組
    start_date = time.strptime(start_date, "%b %d %H:%M:%S %Y GMT")
    start_date_st = time.strftime("%Y-%m-%d %H:%M:%S", start_date)
    # datetime 字符串轉時間數組
    expire_date = datetime.strptime(expire_date, "%b %d %H:%M:%S %Y GMT")
    expire_date_st = datetime.strftime(expire_date,"%Y-%m-%d %H:%M:%S")

    # 剩余天數
    remaining = (expire_date-datetime.now()).days

    print ('域名:', domain)
    print ('通用名:', common_name)
    print ('開始時間:', start_date_st)
    print ('到期時間:', expire_date_st)
    print (f'剩余時間: {remaining}天')
    print ('頒發機構:', issuer)
    print ('*'*30)

    time.sleep(0.5)

if __name__ == "__main__":
    domains = ['www.baidu.com'] 
    for domain in domains:
        main(domain)

結果示例：

域名: www.baidu.com
通用名: baidu.com
開始時間: 2019-05-09 01:22:02
到期時間: 2020-06-25 05:31:02
剩余時間: 82天
頒發機構: GlobalSign Organization Validation CA - SHA256 - G2,O=GlobalSign nv-sa,C=BE
******************************