[3.7] [bpo-28414] Make all hostnames in SSL module IDN A-labels (GH-5128)#5843
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) Previously, the ssl module stored international domain names (IDNs) as U-labels. This is problematic for a number of reasons -- for example, it made it impossible for users to use a different version of IDNA than the one built into Python. After this change, we always convert to A-labels as soon as possible, and use them for all internal processing. In particular, server_hostname attribute is now an A-label, and on the server side there's a new sni_callback that receives the SNI servername as an A-label rather than a U-label. (cherry picked from commit 11a1493) Co-authored-by: Christian Heimes <christian@python.org>
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@ned-deily Hi Ned, here's a PR for 3.7b2 (cf https://bugs.python.org/issue28414#msg310992). |
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@njsmith Thanks! When it's ready, just merge it into the 3.7 branch and it will get picked up for 3.7.0b2. |
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Thanks, @njsmith! |
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Previously, the ssl module stored international domain names (IDNs)
as U-labels. This is problematic for a number of reasons -- for
example, it made it impossible for users to use a different version
of IDNA than the one built into Python.
After this change, we always convert to A-labels as soon as possible,
and use them for all internal processing. In particular, server_hostname
attribute is now an A-label, and on the server side there's a new
sni_callback that receives the SNI servername as an A-label rather than
a U-label.
(cherry picked from commit 11a1493)
Co-authored-by: Christian Heimes christian@python.org
https://bugs.python.org/issue28414