python - SSL 错误握手错误 10054 "WSAECONNRESET"

Question

注意事项:

versions

Python 2.7.11 and my requests version is '2.10.0'
'OpenSSL 1.0.2d 9 Jul 2015'
Please read the below comment by Martijn Pieters before reproducing 

最初我尝试使用如下代码从 https://www.neco.navy.mil/necoattach/N6945016R0626_2016-06-20__INFO_NAS_Pensacola_Base_Access.docx 获取 pdf

代码1:

>>> import requests
>>> requests.get("https://www.neco.navy.mil/necoattach/N6945016R0626_2016-06-20__INFO_NAS_Pensacola_Base_Access.docx",verify=False)

错误:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\api.py", line 67, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\api.py", line 53, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\sessions.py", line 468, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\adapters.py", line 447, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: ("bad handshake: SysCallError(10054, 'WSAECONNRESE
T')",)

经过google和搜索我发现你已经使用了SSL验证并且使用session with adapters可以解决问题。但是我仍然有错误，请在下面找到代码和错误

代码2:

import requests
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.poolmanager import PoolManager
import ssl
import traceback

class MyAdapter(HTTPAdapter):
    def init_poolmanager(self, connections, maxsize, block=False):
        self.poolmanager = PoolManager(num_pools=connections,
                                       maxsize=maxsize,
                                       block=block,
                                       ssl_version=ssl.PROTOCOL_TLSv1)


s = requests.Session()
s.mount('https://', MyAdapter())
print "Mounted    "
r = s.get("https://www.neco.navy.mil/necoattach/N6945016R0626_2016-06-20__INFO_NAS_Pensacola_Base_Access.docx", stream=True, timeout=120)

错误:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\sessions.py", line 480, in get
    return self.request('GET', url, **kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\sessions.py", line 468, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "C:\Users\mob140003207\AppData\Local\Enthought\Canopy\User\lib\site-packa
ges\requests\adapters.py", line 447, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: ("bad handshake: SysCallError(10054, 'WSAECONNRESET')",)

Answer 1

首先，我确认无法从任何地方访问主机 www.neco.navy.mil。从某些网络(地理位置)它可以工作*，从其他网络连接只是挂起:

$ curl www.neco.navy.mil
curl: (7) couldn't connect to host
$ curl https://www.neco.navy.mil
curl: (7) couldn't connect to host

其次，当可以建立连接时出现证书问题:

$ curl -v https://www.neco.navy.mil
* Rebuilt URL to: https://www.neco.navy.mil/
* Hostname was NOT found in DNS cache
*   Trying 205.85.2.133...
* Connected to www.neco.navy.mil (205.85.2.133) port 443 (#0)
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS alert, Server hello (2):
* SSL certificate problem: unable to get local issuer certificate
* Closing connection 0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

为了确保，您只需将它提供给 Qualys SSL tester :

CA(DoD 根 CA 2)不受信任。而且它不在链中。注意 OpenSSL validation process needs whole chain :

Firstly a certificate chain is built up starting from the supplied certificate and ending in the root CA. It is an error if the whole chain cannot be built up.

但只有 www.neco.navy.mil -> DODCA-28。它可能与 TLD 和额外的安全措施有关，但 C 级本身并不多 ;-)

在 Python 方面并没有太大的不同。如果您无权访问 CA，则只能完全禁用证书验证(当然，在解决连接问题之后)。如果你有它，你可以使用 cafile。

#!/usr/bin/env python
# -*- coding: utf-8 -*-


import urllib2
import ssl


ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

r = urllib2.urlopen('https://www.neco.navy.mil/'
  'necoattach/N6945016R0626_2016-06-20__INFO_NAS_Pensacola_Base_Access.docx', 
  timeout = 5, context = ctx)
print(len(r.read()))

r = urllib2.urlopen('https://www.neco.navy.mil/'
  'necoattach/N6945016R0626_2016-06-20__INFO_NAS_Pensacola_Base_Access.docx', 
  timeout = 5, cafile = '/path/to/DODCA-28_and_DoD_Root_CA_2.pem')
print(len(r.read()))

要使用特定版本的 Python 进行重现，请使用如下简单的 Dockerfile:

FROM python:2.7.11

WORKDIR /opt
ADD . ./

CMD dpkg -s openssl | grep Version && ./app.py

然后运行:

docker build -t ssl-test .
docker run --rm ssl-test