Do you have ca-certificates installed? On April 7, 2018 5:33:35 PM Skip Montanaro <skip.montanaro@gmail.com> wrote:

It's been a long while since I rebuilt Python from the Git source. I tried for the first time the other day. Everything passed except test_poplib and test_asyncio. The former just runs and runs and runs. Here's the first traceback I encounter when executing ./python Lib/test/test_poplib.py:

test_stls_context (__main__.TestPOP3Class) ... Exception in thread Thread-16: Traceback (most recent call last): File "/home/skip/src/python/cpython/Lib/threading.py", line 917, in _bootstrap_inner self.run() File "Lib/test/test_poplib.py", line 227, in run asyncore.loop(timeout=0.1, count=1) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 207, in loop poll_fun(timeout, map) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 150, in poll read(obj) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 87, in read obj.handle_error() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 83, in read obj.handle_read_event() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 422, in handle_read_event self.handle_read() File "Lib/test/test_poplib.py", line 194, in handle_read self._do_tls_handshake() File "Lib/test/test_poplib.py", line 174, in _do_tls_handshake self.socket.do_handshake() File "/home/skip/src/python/cpython/Lib/ssl.py", line 1108, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: SSLV3_ALERT_CERTIFICATE_UNKNOWN] sslv3 alert certificate unknown (_ssl.c:1049)

I thought perhaps I was missing something, but _ssl built just fine. I believe I have a recent enough version of libssl (1.0.2g), and I'm on a pretty vanilla system (up-to-date Ubuntu 17.10). SSL-wise:

% apt search ssl | grep installed | egrep '^lib' | egrep ssl

libgnutls-openssl27/artful,now 3.5.8-6ubuntu3 amd64 [installed] libio-socket-ssl-perl/artful,artful,now 2.050-1 all [installed] libnet-smtp-ssl-perl/artful,artful,now 1.04-1 all [installed] libnet-ssleay-perl/artful,now 1.80-1build1 amd64 [installed] libssl-dev/artful-updates,artful-security,now 1.0.2g-1ubuntu13.4 amd64 [installed] libssl-doc/artful-updates,artful-updates,artful-security,artful-security,now 1.0.2g-1ubuntu13.4 all [installed,automatic] libssl1.0.0/artful-updates,artful-security,now 1.0.2g-1ubuntu13.4 amd64 [installed]

Any clues about what I might be missing from my setup would be appreciated.

Not sure what was wrong with test_asyncio. I ran it in isolation and it passed.

Thx,

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On Sat, 7 Apr 2018 17:31:47 -0500 Skip Montanaro <skip.montanaro@gmail.com> wrote:

It's been a long while since I rebuilt Python from the Git source. I tried for the first time the other day. Everything passed except test_poplib and test_asyncio. The former just runs and runs and runs. Here's the first traceback I encounter when executing ./python Lib/test/test_poplib.py:

test_stls_context (__main__.TestPOP3Class) ... Exception in thread Thread-16: Traceback (most recent call last): File "/home/skip/src/python/cpython/Lib/threading.py", line 917, in _bootstrap_inner self.run() File "Lib/test/test_poplib.py", line 227, in run asyncore.loop(timeout=0.1, count=1) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 207, in loop poll_fun(timeout, map) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 150, in poll read(obj) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 87, in read obj.handle_error() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 83, in read obj.handle_read_event() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 422, in handle_read_event self.handle_read() File "Lib/test/test_poplib.py", line 194, in handle_read self._do_tls_handshake() File "Lib/test/test_poplib.py", line 174, in _do_tls_handshake self.socket.do_handshake() File "/home/skip/src/python/cpython/Lib/ssl.py", line 1108, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: SSLV3_ALERT_CERTIFICATE_UNKNOWN] sslv3 alert certificate unknown (_ssl.c:1049) [...]

I get the same issues too, and this has been happening for quite some time. The tests and/or poplib itself may be written in a fragile way. Regards Antoine.

On 2018-04-08 01:33, Skip Montanaro wrote:

...

Do you have ca-certificates installed?

It seems so:

% apt search ca-certificates | grep installed

ca-certificates/artful,artful,now 20170717 all [installed] ca-certificates-mono/artful,artful,now 4.6.2.7+dfsg-1ubuntu1 all [installed,automatic] liblwp-protocol-https-perl/artful,artful,now 6.07-2 all [installed]

Skip, it's a red herring. Python's test_poplib suite doesn't depend on public CA certs.

On 2018-04-09 10:30, Serhiy Storchaka wrote:

...

I get the same issues too, and this has been happening for quite some time.  The tests and/or poplib itself may be written in a fragile way.

I get the different issue with test_poplib (running with the -j option). All tests except test_multiprocessing_fork are passed, and test_poplib hangs. I thought it is a misconfiguration on my computer.

It's not your computer, it's the test suite. It uses the old asyncore library. The test has become unstable since the ssl module properly checks host names, see https://bugs.python.org/issue32706 and https://bugs.python.org/issue32753. In Python 3.6 and earlier, a hostname verification error resulted in a closed connection. Starting with Python 3.7, the ssl module checks the hostname earlier in the TLS handshake. A verification error results in a TLS handshake alert and an exception on the server side. Sometimes the old server code in asyncore runs into a race condition and the test fails. The whole test framework needs to be rewritten from scratch and replaced with something better. I haven't had time to work on it. Christian