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Committer:
Vladimir Homutov
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Date:
2021-10-20 06:45:34 UTC
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Revision ID:
git-v1:1fecec0cbf1554c0473d5cca0fb55f8dc006e4ba
Mail: connections with wrong ALPN protocols are now rejected.
This is a recommended behavior by RFC 7301 and is useful
for mitigation of protocol confusion attacks [1].
For POP3 and IMAP protocols IANA-assigned ALPN IDs are used [2].
For the SMTP protocol "smtp" is used.
[1] https://alpaca-attack.com/
[2] https://www.iana.org/assignments/tls-extensiontype-values/