python ssl库似乎只有在具有有效签名的情况下才能为您解析证书。
"""Returns a formatted version of the data in the
certificate provided by the other end of the SSL channel.
Return None if no certificate was provided, {} if a
certificate was provided, but not validated."""
您仍然可以使用该ssl.get_server_certificate()功能获取服务器证书，但是它将以PEM格式返回。（或者，您可以调用c.getpeercert(True)，以二进制DER格式返回证书，而不管其是否经过验证。）
>>> print ssl.get_server_certificate(('server.test.com', 443))
-----BEGIN CERTIFICATE-----
MIID4zCCAsugAwIBA.....
从这里，我将使用M2Crypto或OpenSSL来读取证书并获取值：
# M2Crypto
cert = ssl.get_server_certificate(('www.google.com', 443))
x509 = M2Crypto.X509.load_cert_string(cert)
x509.get_subject().as_text()
# 'C=US, ST=California, L=Mountain View, O=Google Inc, CN=www.google.com'
# OpenSSL
x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)
x509.get_subject().get_components()
#[('C', 'US'),
# ('ST', 'California'),
# ('L', 'Mountain View'),
# ('O', 'Google Inc'),
# ('CN', 'www.google.com')]
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