ssl.SSLError: tlsv1 警报协议版本 [英] ssl.SSLError: tlsv1 alert protocol version

问题描述

我将 REST API 用于 Cisco CMX 设备，并尝试编写向 API 发出 GET 请求以获取信息的 Python 代码.代码如下，除了必要的信息有所改变外，与文件中的代码相同.

I'm using the REST API for a Cisco CMX device, and trying to write Python code which makes a GET request to the API for information. The code is as follows and is the same as that in the file except with the necessary information changed.

from http.client import HTTPSConnection
from base64 import b64encode


# Create HTTPS connection
c = HTTPSConnection("0.0.0.0")

# encode as Base64
# decode to ascii (python3 stores as byte string, need to pass as ascii 
value for auth)
username_password = b64encode(b"admin:password").decode("ascii")
headers = {'Authorization': 'Basic {0}'.format(username_password)}

# connect and ask for resource
c.request('GET', '/api/config/v1/aaa/users', headers=headers)

# response
res = c.getresponse()

data = res.read()

但是，我不断收到以下错误:

However, I am continuously getting the following error:

Traceback (most recent call last):
  File "/Users/finaris/PycharmProjects/test/test/test.py", line 14, in <module>
    c.request('GET', '/api/config/v1/aaa/users', headers=headers)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 1106, in request
    self._send_request(method, url, body, headers)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 1151, in _send_request
    self.endheaders(body)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 1102, in endheaders
    self._send_output(message_body)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 934, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 877, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/http/client.py", line 1260, in connect
    server_hostname=server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/ssl.py", line 377, in wrap_socket
    _context=self)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/ssl.py", line 752, in __init__
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/ssl.py", line 988, in do_handshake
    self._sslobj.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/ssl.py", line 633, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645)

我也尝试更新 OpenSSL，但没有效果.

I also tried updating OpenSSL but that had no effect.

推荐答案

我遇到了同样的错误，谷歌把我带到了这个问题，所以我做了这个，希望它可以帮助处于类似情况的其他人.

I had the same error and google brought me to this question, so here is what I did, hoping that it helps others in a similar situation.

这适用于 OS X.

在终端中检查我拥有的 OpenSSL 版本:

Check in the Terminal which version of OpenSSL I had:

$ python3 -c "import ssl; print(ssl.OPENSSL_VERSION)"
>> OpenSSL 0.9.8zh 14 Jan 2016

由于我的 OpenSSL 版本太旧，接受的答案不起作用.

As my version of OpenSSL was too old, the accepted answer did not work.

所以我不得不更新 OpenSSL.为此，我按照 此处建议的一些步骤，使用 Homebrew 将 Python 更新到最新版本(从 3.5 版到 3.6 版)/a>:

So I had to update OpenSSL. To do this, I updated Python to the latest version (from version 3.5 to version 3.6) with Homebrew, following some of the steps suggested here:

$ brew update
$ brew install openssl
$ brew install python3

然后我遇到了 PATH 和正在使用的 python 版本的问题，所以我创建了一个新的 virtualenv 以确保使用最新版本的 python:

Then I was having problems with the PATH and the version of python being used, so I just created a new virtualenv making sure that the newest version of python was taken:

$ virtualenv webapp --python=python3.6

问题已解决.

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