MRG: update version of OpenSSL on Manylinux and Windows

[matthew-brett]

@njs - do I understand right, from your email on the distutils list,
that this should be a full fix?

@dvarrazzo - is there a good way for me to test the fix?

[dvarrazzo]

I've never been able to reproduce the issue, so I wouldn't know. I guess it would be a combination of multithread database connections and https requests.

[matthew-brett]

Am I right in thinking that the error here is due to something being encrypted to the main wheels repo? And therefore that pull request will always fail like this, if made from another repo, like a fork?

$ openssl aes-256-cbc -K $encrypted_bd656d6a5753_key -iv $encrypted_bd656d6a5753_iv -in id_rsa-travis-upload.enc -out /tmp/id_rsa-travis-upload -d
iv undefined
The command "openssl aes-256-cbc -K $encrypted_bd656d6a5753_key -iv $encrypted_bd656d6a5753_iv -in id_rsa-travis-upload.enc -out /tmp/id_rsa-travis-upload -d" failed and exited with 1 during .

https://travis-ci.org/psycopg/psycopg2-wheels/jobs/516942233#L469

[dvarrazzo]

That's uploading the artifacts to our servers, and requires and encrypted private key. You can comment out that line, I can make sure that change won't be merged.

[njsmith]

@njs - do I understand right, from your email on the distutils list,
that this should be a full fix?

It's @njsmith, but otherwise yes, I believe this is correct :-).

In openssl 1.0.2 and earlier, by default openssl is not thread safe at all, and you have to do some special setup to use it from multiple threads. psycopg2 doesn't do that setup, so of course you'd expect weird crashes when working with encrypted connections from multiple threads simultaneously. In openssl 1.1.0 and later, openssl does its own locking by default, so the user isn't required to do anything special to make threads work. There's some discussion in this blog post:

https://www.openssl.org/blog/blog/2017/02/21/threads/

Technically it's possible that there are multiple bugs, and this just fixes one of them. We won't know for 100% certain until it's released and people either report bugs or not. It would probably be a good idea to try to recruit some of the folks in the original issue threads who were hitting the issue, and asking them to try out the new wheels and confirm they fix their issues.

But the bug pattern of only happening with the wheels and not with source builds is very strange, and is exactly what you'd expect from this openssl locking thing, so I'm pretty confident that this will help a lot.

[matthew-brett]

OK - builds are working now. As you can see I:

• updated OpenSSL to 1.1.1b
• updated OpenLDAP to 2.4.47 (to allow compilation against OpenSSL 1.1.1b)
• removed --with-krb5-flavor=MIT from OpenSSL configure; OpenSSL dropped all the Kerberos configure stuff for 1.1 see this mailing list thread.

@njsmith - the Mac builds are, I guess, using the system SSL; is that going to be a problem?

[dvarrazzo]

Hi Matthew, thank you for this.

Could you please make sure the tests connect to the database using ssh? This wouldn't prove the issue is fixed but at least that some basic work is there.

It should be just a matter of setting the env var PGSSLMODE=require before running the tests.

According to psycopg/psycopg2#836 the issue is also on Windows. Would you be able to fix appveyor to build openssh 1.1 there too? @jerickso is usually the window person, I can try stabbing in the dark too... Just let me know if you have interest in working on it.

[matthew-brett]

I'm not nearly as comfortable on Windows, strange to relate. It also looks as if @jerickso has thought about this already: https://github.com/psycopg/psycopg2-wheels/blob/master/appveyor.yml#L162 - is it possible the fix is just to uncomment these lines?

[matthew-brett]

Is this enough to run the ssh / Postgres test? https://travis-ci.org/psycopg/psycopg2-wheels/jobs/517776358#L1121

The test count is the same as it was before, at 761.

[dvarrazzo]

is it possible the fix is just to uncomment these lines?

Maybe it is, as I said for me too is a bit stabbing in the dark. My approach would be to mung that appveyor file until it gives up and works, or I give up and decide I have better things to do :)

[dvarrazzo]

Is this enough to run the ssh

I think it is, all the db communication in the test suite should have happened on ssh.

Unfortunately that's not enough to prove the ssh concurrency problems are fixed, but it's what I'd release for next wheels, if we get window on the same library too (and, honestly, without that, too)

[matthew-brett]

Windows looks like it's working now:

https://ci.appveyor.com/project/matthew-brett/psycopg2-wheels

I had to patch setup.py to find the OpenSSL 1.1 libraries; they have different names:

https://github.com/psycopg/psycopg2-wheels/pull/8/files#diff-b41f560b111a0ae2ecc9843bcb0b50a3

[matthew-brett]

Well - yes - but then psycopg2 won't build against OpenSSL 1.0.x. Maybe that's a feature ...

[dvarrazzo]

I think it's fine. What we release is those binary packages and maybe the exe which Jason publishes (or used to) on his website. The psycopg2 project builds the library for Windows to run the tests and it seems wise to use the same ssh libraries we deploy; those artifacts are not distributed. And that's it, I don't think there are other uses.

I would considering a non-segfaulting library a nice feature to have, yes 😁

[matthew-brett]

Ok - do you want me to do a PR to the main repo for the library name changes?

[dvarrazzo]

I would say, unless @jerickso thinks what we are doing is a bad idea, this is what I would do.

[njsmith]

In case anyone else was confused reading this comment thread, I think every time someone said "ssh" they actually meant "ssl"?

[jerickso]

Looking over the appveyor yml, I did have comments on the steps I thought needed for building OpenSSL 1.1.0, but as @matthew-brett noted, the 1.1.x OpenSSL library names are different than the 1.0.x and got side tracked with life.

Since @njsmith mentioned that OpenSSL 1.1.x is more thread safe because it does some locking for us, I think requiring OpenSSL 1.1.x is a sensible requirement.

[matthew-brett]

OK - PR to master, for library name change, at psycopg/psycopg2#894

Maybe build wheels for current version using patch to setup.py here, and then revert a728c13, ready for next version?

[matthew-brett]

@njsmith - any thoughts on the Mac / SSL threading?

[njsmith]

By "system SSL" do you mean the openssl that ships with macOS? You want to get off that ASAP regardless of any threading issues. I'm surprised you can even build anything against it. Are you sure you aren't actually getting openssl through homebrew or something?

[matthew-brett]

Ah yes, the wheel build picks up a homebrew postgresql install:

https://travis-ci.org/psycopg/psycopg2-wheels/jobs/518044937#L384

The build uses xcode9.2, which corresponds to macOS 10.12: https://docs.travis-ci.com/user/reference/osx

I have macOS 10.14 on my machines; the homebrew versions somewhat depend on the macOS version. Even on 10.14, installing postgresql now:

$ otool -L /usr/local/Cellar/postgresql/11.2/lib/libpq.dylib 
/usr/local/Cellar/postgresql/11.2/lib/libpq.dylib:
	/usr/local/opt/postgresql/lib/libpq.5.dylib (compatibility version 5.0.0, current version 5.11.0)
	/usr/local/opt/openssl/lib/libssl.1.0.0.dylib (compatibility version 1.0.0, current version 1.0.0)
	/usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos (compatibility version 5.0.0, current version 6.0.0)
	/System/Library/Frameworks/LDAP.framework/Versions/A/LDAP (compatibility version 1.0.0, current version 2.4.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.200.5)

What do you think? Are we going to have to rebuild everything, until homebrew catches up?

[njsmith]

You know infinitely more about building wheels on macOS than I do :-).

The pyca/cryptography project definitely builds wheels that use the latest openssl on macOS... maybe @reaperhulk or @alex could say something about how they manage it?

[alex]

I'm not totally sure I understand the question, but I think https://github.com/pyca/cryptography/blob/master/.jenkins/Jenkinsfile-Update-Homebrew-OpenSSL is the relevant bit -- we rebuild openssl from homebrew.

[reaperhulk]

We build against the openssl@1.1 formula artifacts (and statically link!). It's not actually necessary to rebuild the way we do if you're on a new enough macOS to have bottles available. We do our rebuild process for both legacy and older macOS CI reasons.

[matthew-brett]

As a data point, running the tests on my macOS 10.14 laptop, with export PGSSLMODE=require, and an install from psycopg2-binary, does not generate an error. So I assume that test isn't very sensitive to psycopg/psycopg2#543

[dvarrazzo]

Hi @matthew-brett,

I have applied your patch to psycopg2 setup.py to the main project (psycopg/psycopg2@72fe91c), and I've changed your branch (into our branch update-openssl) to make use of it (plus some minimal rebasing and re-enabling artifacts upload).

I understand everything is ready for openssl 1.1 on Windows and Linux. Do you think it's ok to leave OSX on 1.0 for the moment?

Thank you very much!

[dvarrazzo]

I have also added a commit to master to skip upload if the keys are missing, in case you want to rebase your branch on ours.

[njsmith]

I understand everything is ready for openssl 1.1 on Windows and Linux. Do you think it's ok to leave OSX on 1.0 for the moment?

Presumably you wouldn't want to upload psycopg2 wheels for OSX until OSX gets the upgrade to 1.1, but there's no reason you can't upload Window and Linux wheels while waiting for OSX to catch up.

[dvarrazzo]

Ok @njsmith, I'm building all the packages as of the current state then, to be pushed to testpypi, and merge to branch if there are no obvious problems.

[dvarrazzo]

I have created test packages: could you please test if they work correctly?

pip install -i https://test.pypi.org/simple/ psycopg2-binary==2.8.2.dev0

I've asked to run some tests for windows on psycopg/psycopg2#836 because appveyor doesn't seem supporting ssl on the server. Once I have a go on windows about basic ssl functionality I can release 2.8.2

Thank you everyone!

[dvarrazzo]

Merged to master after further adjustments by @jerickso. Thank you @matthew-brett!