New submission from Chi Hsuan Yen:
This was originally a post at python-ideas. Now I reformat it to be more like a
feature request.
Currently, Python raises SSLError with reason=CERTIFICATE_VERIFY_FAILED for all
kinds of certificate verification failures. This results in difficulties in
debugging SSL errors for others. (Some downstream bug reports: [1][2]) In
OpenSSL, such errors are further divided into several kinds. For example,
expired certificates result in X509_V_ERR_CERT_HAS_EXPIRED, and typical
self-signed certificates fall into X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT. The
error code can be retrieved via `SSL_get_verify_result` and human readable
messages are available from `X509_verify_cert_error_string`. I hope I can get
error messages like this: (Omit URLError to avoid verbose messages)
$ ./python -c 'import urllib.request;
urllib.request.urlopen("https://self-signed.badssl.com/";)'
Traceback (most recent call last):
File "/home/yen/Projects/cpython/Lib/urllib/request.py", line 1318, in do_open
encode_chunked=req.has_header('Transfer-encoding'))
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1239, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1285, in
_send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1234, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1026, in
_send_output
self.send(msg)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 964, in send
self.connect()
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1400, in connect
server_hostname=server_hostname)
File "/home/yen/Projects/cpython/Lib/ssl.py", line 401, in wrap_socket
_context=self, _session=session)
File "/home/yen/Projects/cpython/Lib/ssl.py", line 808, in __init__
self.do_handshake()
File "/home/yen/Projects/cpython/Lib/ssl.py", line 1061, in do_handshake
self._sslobj.do_handshake()
File "/home/yen/Projects/cpython/Lib/ssl.py", line 683, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED: DEPTH_ZERO_SELF_SIGNED_CERT]
certificate verify failed: self signed certificate (_ssl.c:752)
And for expired certificates:
$ ./python -c 'import urllib.request;
urllib.request.urlopen("https://expired.badssl.com/";)'
Traceback (most recent call last):
File "/home/yen/Projects/cpython/Lib/urllib/request.py", line 1318, in do_open
encode_chunked=req.has_header('Transfer-encoding'))
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1239, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1285, in
_send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1234, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1026, in
_send_output
self.send(msg)
File "/home/yen/Projects/cpython/Lib/http/client.py", line 964, in send
self.connect()
File "/home/yen/Projects/cpython/Lib/http/client.py", line 1400, in connect
server_hostname=server_hostname)
File "/home/yen/Projects/cpython/Lib/ssl.py", line 401, in wrap_socket
_context=self, _session=session)
File "/home/yen/Projects/cpython/Lib/ssl.py", line 808, in __init__
self.do_handshake()
File "/home/yen/Projects/cpython/Lib/ssl.py", line 1061, in do_handshake
self._sslobj.do_handshake()
File "/home/yen/Projects/cpython/Lib/ssl.py", line 683, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED: CERT_HAS_EXPIRED] certificate
verify failed: certificate has expired (_ssl.c:752)
I've once tried to achieve it, but my CPython knowledge is way too limited to
give a good enough patch.
[1] https://github.com/rg3/youtube-dl/issues/10574
[2] https://github.com/rg3/youtube-dl/issues/7309
----------
assignee: christian.heimes
components: SSL
messages: 276724
nosy: Chi Hsuan Yen, alex, christian.heimes, dstufft, janssen
priority: normal
severity: normal
status: open
title: Expose OpenSSL verification results in SSLError
type: enhancement
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28182>
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