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| author | tb <> | 2020-03-06 16:31:30 +0000 |
|---|---|---|
| committer | tb <> | 2020-03-06 16:31:30 +0000 |
| commit | 6326e46ece7f938469b33d5f69c4d12688618e6e (patch) | |
| tree | a651d369793dfeaba4db323fa66c76dc4b761c94 /src/lib/libssl/tls13_buffer.c | |
| parent | 26ef5580166bc8d9119f867542fa40e12a4b18a4 (diff) | |
| download | openbsd-6326e46ece7f938469b33d5f69c4d12688618e6e.tar.gz openbsd-6326e46ece7f938469b33d5f69c4d12688618e6e.tar.bz2 openbsd-6326e46ece7f938469b33d5f69c4d12688618e6e.zip | |
TLSv1.3 servers that intend to downgrade are required to set the last
eight bytes of the server's random to a magic cookie (RFC 8446, 4.1.3).
The TLSv1.3 spec changes the TLSv1.2 spec in that it recommends that
TLSv1.2 servers that negotiate TLSv1.1 or below do the same. This gives
a limited additional protection against downgrade attacks beyond what is
already present in the Finished exchange.
The TLSv1.3 part was already implemented in Hobart and can be trivially
modified to do the TLSv1.2 bit as well.
ok inoguchi, jsing
Diffstat (limited to 'src/lib/libssl/tls13_buffer.c')
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