使用 pyOpenSSL 解析证书的正确姿势

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前言

需求很简单，通过域名证书的私钥分析证书的DNS域名以及有效期

实现

分析后决定用pyOpenSSL来实现，具体代码如下

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from OpenSSL import crypto
from dateutil import parser

class Ssl():
    def parse(self, certificate):
        res = {
            "domain": []
        }
        cert = crypto.load_certificate(crypto.FILETYPE_PEM, certificate)
        # 有效期
        datetime_struct_start = parser.parse(cert.get_notBefore().decode("UTF-8"))
        datetime_struct_end = parser.parse(cert.get_notAfter().decode("UTF-8"))
        res['start_time'] = datetime_struct_start.strftime('%Y-%m-%d %H:%M:%S')
        res['end_time'] = datetime_struct_end.strftime('%Y-%m-%d %H:%M:%S')
        # 扩展
        count = cert.get_extension_count()
        for i in range(count):
            crt = cert.get_extension(i)
            name = str(crt.get_short_name(), encoding="utf-8")
            if name == "subjectAltName":
                _list = str(crt).split(',')
                _it = iter(_list)    # 创建迭代器对象
                for x in _it:
                    res["domain"].append(x.strip().replace("DNS:", ""))
                break
        return res

if __name__ == '__main__':
    _certificate="""证书私钥"""
    ssl = Ssl()
    print(ssl.parse(_certificate))
    # {'domain': ['*.jakehu.me', 'jakehu.me'], 'start_time': '2021-07-12 18:01:16', 'end_time': '2021-10-10 18:01:15'}

最后

通过get_subject()和get_issuer()获取证书的其他信息

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subject = cert.get_subject()
issuer = cert.get_issuer()

print("证书版本:", cert.get_version() + 1)
print("证书序列号:", hex(cert.get_serial_number()))
print("证书中使用的签名算法:", cert.get_signature_algorithm().decode("UTF-8"))
print("颁发者:", issuer.commonName)
datetime_struct = parser.parse(cert.get_notBefore().decode("UTF-8"))
print("有效期从:", datetime_struct.strftime('%Y-%m-%d %H:%M:%S'))
datetime_struct= parser.parse(cert.get_notAfter().decode("UTF-8"))
print("到:", datetime_struct.strftime('%Y-%m-%d %H:%M:%S'))
print("证书是否已经过期:", cert.has_expired())
print("公钥长度", cert.get_pubkey().bits())
print("公钥:\n", crypto.dump_publickey(crypto.FILETYPE_PEM, cert.get_pubkey()).decode("utf-8"))
print("主体信息:")
print("CN:通用名称  OU:机构单元名称")
print("O:机构名  L:地理位置")
print("S:州/省名  C:国名")
for item in issuer.get_components():
    print(item[0].decode("utf-8"), "  ——  ", item[1].decode("utf-8"))