Wandering Thoughts archives


Sorting out the dates of Python 2's 'end of life'

Probably like many people, I've been hearing for years now that January of 2020 was the end of life for Python 2, specifically January 1st. As a result, I was rather surprised to hear that there will be another release of Python 2 in April, although I could have read the actual details in PEP 373 and avoided this.

The official dates, from PEP 373, are:

Planned future release dates:

  • 2.7.18 code freeze January, 2020
  • 2.7.18 release candidate early April, 2020
  • 2.7.18 mid-April, 2020

What this actually means is not clear to me, given the four month delay between the code freeze (now) and the planned release of even a 2.7.18 release candidate (April). At a minimum, I assume that the code freeze blocks new features, should anyone want to submit any. I suspect that the Python people would not accept fixes for new bugs or for existing bugs that did not have some version of a fix accepted before the code freeze. I assume that Python developers will still accept fixes for accepted bugfixes, if testing shows that any have problems.

(If Python isn't going to accept changes into what will be released as 2.7.18 for any reason at all, they might as well release tomorrow instead of in four months.)

Although the details are set out in PEP 373, this way of describing Python 2's end of life is a little bit unusual and different from what I (and likely other people) expected from an 'End of Life' date. The usual practice with EOL dates is that absolutely nothing will be released beyond that point, not that main development stops and then a final release will be made some time later.

(This is what Linux distributions do, for example; the EOL date for a distribution release is when the last package updates will come out. I believe it's similar for the BSD Unixes.)

It's very unclear to me how Linux distributions (and the BSDs) are likely to handle Python 2 versions in light of this. At least some of them will still be packaging Python 2 in versions released beyond April of 2020. They might freeze their Python 2 version on the current 2.7.17 (or whatever they already have), or upgrade to 2.7.18 as one last Python 2 (re-)packaging.

python/Python2EOLDates written at 22:18:50; Add Comment

How I now think you want to configure Apache for OCSP stapling

When I initially set up OCSP stapling while I was modernizing our Apache TLS configurations, I followed the standard setup from the Mozilla SSL configuration generator (as is my usual habit). For OCSP stapling, the configuration this generates was (and is) just:

SSLUseStapling On
SSLStaplingCache "shmcb:logs/ssl_stapling(32768)"

Then recently our web servers at work couldn't get a good answer from Let's Encrypt's OCSP servers, for reasons that aren't clear to us. Some people experienced issues where their Firefox would refuse to connect to these web servers, rejecting things with a SEC_ERROR_OCSP_TRY_SERVER_LATER error.

(It's possible that this actually comes from Firefox itself directly querying the LE OCSP servers. These people were inside the same networks as the web servers and our problem could well have been a firewall or network reachability issue to LE's OCSP servers, instead of an issue on LE's side.)

This experience made me look into what happens when OCSP stapling runs into errors, and also into the Apache documentation. The result of this is that I now think that you should always tell Apache to not return OCSP errors, by also adding the Apache configuration option for this:

SSLStaplingReturnResponderErrors off

(The default is 'on'.)

This does the most aggressive version of handling OCSP problems; if set to off, the documentation says 'only responses indicating a certificate status of "good" will be included in the TLS handshake'. Expired responses, any errors, and any other certificate status causes Apache to not include OCSP stapling information at all.

(You may also want to see this Apache bug.)

PS: Firefox still defaults to checking certificate status through OCSP if necessary, but you can change this if you want to. The normal preferences only let you turn this off entirely, but if you go into about:config and set security.OCSP.enabled to the value of '2', Firefox will do OCSP checks for EV certificates but not for normal ones. Given the increasing disuse of EV certificates, I don't think it's worth bothering; just turn off OCSP checking entirely.

web/ApacheOCSPStaplingSettings written at 01:08:34; Add Comment

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