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The patch implements OCSP and CRL distribution point access for getpeercert(). I'll add tests and doc updates later.
Output for https://info.pca.dfn.de/
{'OCSP': ('http://ocsp.pca.dfn.de/OCSP-Server/OCSP',),
 'crlDistributionPoints': ('http://cdp1.pca.dfn.de/global-services-ca/pub/crl/cacrl.crl',
 'http://cdp2.pca.dfn.de/global-services-ca/pub/crl/cacrl.crl'),
 'issuer': ((('countryName', 'DE'),),
 (('organizationName', 'DFN-Verein'),),
 (('organizationalUnitName', 'DFN-PKI'),),
 (('commonName', 'DFN-Verein CA Services'),)),
 'notAfter': 'Oct 18 09:07:09 2014 GMT',
 'notBefore': 'Oct 19 09:07:09 2009 GMT',
 'serialNumber': '0EFBA9CC',
 'subject': ((('countryName', 'DE'),),
 (('organizationName', 'DFN-Verein'),),
 (('organizationalUnitName', 'DFN-PKI'),),
 (('commonName', 'info.pca.dfn.de'),)),
 'version': 3}

Updated patch with test, doc updates and a third field. I have added CDP and two AIA URIs: crlDistributionPoints, caIssuers and OCSP

Do you have to put those certs in capath? Things would probably be simpler if you didn't have to trigger capath loading using an actual SSL connection.
Also, please a versionadded tag in the doc entry.

It's just one certificate. The hash format of OpenSSL has changed over the years so we have to duplicate all certificates. But I don't need the extra stuff. I figured out that the Nokia test certificate has all new fields.
My initial patch has a versionchanged doc update. Did you have too much French wine again? *scnr* :)

> It's just one certificate.
Indeed, it's just the decision to use capath that I'm arguing with.
> My initial patch has a versionchanged doc update. Did you have too
> much French wine again? *scnr* :)
Not *too much*, no ;-)

Are you satisfied with my patch? I'd like to commit it before beta 1

New changeset 468d18bffdea by Christian Heimes in branch 'default':
Issue #18379: SSLSocket.getpeercert() returns CA issuer AIA fields, OCSP
http://hg.python.org/cpython/rev/468d18bffdea 

memo to me: update whatsnew

New changeset 40bfddda43d4 by Christian Heimes in branch 'default':
Issue #19682: Fix compatibility issue with old version of OpenSSL that
http://hg.python.org/cpython/rev/40bfddda43d4 

New changeset 7885876b6503 by R David Murray in branch 'default':
whatsnew: SSLSocket.getpeercert new values returned. (#18379)
http://hg.python.org/cpython/rev/7885876b6503