概述
这是相关的代码：
file = open("list.txt","r")
for x in file:
server = socket.getaddrinfo(x.rstrip(),"443")[0][4][0]
sslsocket = socket.socket()
sslsocket.connect((server,443))
sslsocket = ssl.wrap_socket(sslsocket,cert_reqs=ssl.CERT_required,ca_certs="cacerts.txt")
certificate = sslsocket.getpeercert()`import ssl
ssl.get_server_certificate(("www.sefaz.ce.gov.br",443))我认为函数doc字符串比python doc site更清晰：
"""Retrieve the certificate from the server at the specified address,and return it as a PEM-encoded string. If 'ca_certs' is specified,validate the server cert against it. If 'ssl_version' is specified,use it in the connection attempt."""
因此,您可以从二进制DER证书中提取通用名称,以搜索通用名称对象标识符：
def get_commonname(host,port=443):
oid='\x06\x03U\x04\x03' # Object Identifier 2.5.4.3 (COMMON NAME)
pem=ssl.get_server_certificate((host,port))
der=ssl.PEM_cert_to_DER_cert(pem)
i=der.find(oid) # find first common name (certificate authority)
if i!=-1:
i=der.find(oid,i+1) # skip and find second common name
if i!=-1:
begin=i+len(oid)+2
end=begin+ord(der[begin-1])
return der[begin:end]
return None总结
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