我正在尝试用 Python 连接到我的一台服务器。
当我发出以下命令时，在我的 Windows 10 系统上：
openssl s_client -connect host_ip:443
结果是：
---
SSL handshake has read 858 bytes and written 494 bytes
---
New, TLSv1/SSLv3, Cipher is RC4-SHA
Server public key is 1024 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1.1
Cipher : RC4-SHA
来到 python，我尝试设置 SSL 上下文和密码：
ssl_context = ssl.create_default_context()
### The Following Changes Worked setting up the cipher ####
ciphers = ssl._DEFAULT_CIPHERS
# print (ciphers)
ciphers = re.sub(r":!RC4", "", ciphers)
# print(ciphers)
ciphers = ciphers + ":RC4-SHA"
ssl_context.set_ciphers(ciphers)
######################################################
ssl_context.options &= ~ssl.OP_NO_SSLv3 # I need to connect to a old server.
ssl_context.check_hostname = False
ssl_context.verify_mode = ssl.CERT_NONE
.
.
.
但是在建立连接时出现错误：
[SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:1108)
系统版本：
> openssl version
WARNING: can't open config file: /z/extlib/_openssl__/ssl/openssl.cnf
OpenSSL 1.0.2o 27 Mar 2018
> python --version
Python 3.8.3
> pip show pyOpenSSL
Name: pyOpenSSL
Version: 19.1.0