Software / code / prosody
Changeset
10224:94e341dee51c
core.certmanager: Move EECDH ciphers before EDH in default cipherstring
The original intent of having kEDH before kEECDH was that if a `dhparam`
file was specified, this would be interpreted as a preference by the
admin for old and well-tested Diffie-Hellman key agreement over newer
elliptic curve ones. Otherwise the faster elliptic curve ciphersuites
would be preferred. This didn't really work as intended since this
affects the ClientHello on outgoing s2s connections, leading to some
servers using poorly configured kEDH.
With Debian shipping OpenSSL settings that enforce a higher security
level, this caused interoperability problems with servers that use DH
params smaller than 2048 bits. E.g. jabber.org at the time of this
writing has 1024 bit DH params.
MattJ says
> Curves have won, and OpenSSL is less weird about them now
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Sun, 25 Aug 2019 20:22:35 +0200 |
| parents | 10223:d185c4961ee0 |
| children | 10225:9bdd9b6bf362 |
| files | core/certmanager.lua |
| diffstat | 1 files changed, 1 insertions(+), 1 deletions(-) [+] |
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--- a/core/certmanager.lua Fri Aug 23 01:28:53 2019 +0200 +++ b/core/certmanager.lua Sun Aug 25 20:22:35 2019 +0200 @@ -123,8 +123,8 @@ "P-521", }; ciphers = { -- Enabled ciphers in order of preference: + "HIGH+kEECDH", -- Ephemeral Elliptic curve Diffie-Hellman key exchange "HIGH+kEDH", -- Ephemeral Diffie-Hellman key exchange, if a 'dhparam' file is set - "HIGH+kEECDH", -- Ephemeral Elliptic curve Diffie-Hellman key exchange "HIGH", -- Other "High strength" ciphers -- Disabled cipher suites: "!PSK", -- Pre-Shared Key - not used for XMPP
