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Add X25519 to the default set of curves

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Since many clients default to the X25519 curve in the TLS handshake,
the fact that the server by defualt doesn't support it cause an extra
roundtrip for each TLS connection.  By adding multiple curves, which
is supported since 3d1ef3a15c, we can reduce the risk of extra
roundtrips.

Author: Daniel Gustafsson <daniel@yesql.se>
Co-authored-by: Jacob Champion <jacob.champion@enterprisedb.com>
Reported-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com>
Discussion: https://postgr.es/m/20240616234612.6cslu7nqexquvwj7@awork3.anarazel.de
This commit is contained in:
Daniel Gustafsson
2025-03-18 15:26:27 +01:00
parent 4fd02bf7cf
commit daa02c6bd9
4 changed files with 4 additions and 4 deletions
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2
doc/src/sgml/config.sgml
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@ -1520,7 +1520,7 @@ include_dir 'conf.d'
It does not need to be the same curve used by the server's Elliptic
Curve key. This parameter can only be set in the
<filename>postgresql.conf</filename> file or on the server command line.
The default is <literal>prime256v1</literal>.
The default is <literal>X25519:prime256v1</literal>.
</para>
<para>

2
src/backend/utils/misc/guc_tables.c
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@ -4768,7 +4768,7 @@ struct config_string ConfigureNamesString[] =
},
&SSLECDHCurve,
#ifdef USE_SSL
"prime256v1",
"X25519:prime256v1",
#else
"none",
#endif

2
src/backend/utils/misc/postgresql.conf.sample
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@ -114,7 +114,7 @@
#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed TLSv1.2 ciphers
#ssl_tls13_ciphers = '' # allowed TLSv1.3 cipher suites, blank for default
#ssl_prefer_server_ciphers = on
#ssl_groups = 'prime256v1'
#ssl_groups = 'X25519:prime256v1'
#ssl_min_protocol_version = 'TLSv1.2'
#ssl_max_protocol_version = ''
#ssl_dh_params_file = ''

2
src/test/ssl/t/SSL/Server.pm
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@ -301,7 +301,7 @@ sub switch_server_cert
$node->append_conf('sslconfig.conf', "ssl=on");
$node->append_conf('sslconfig.conf', $backend->set_server_cert(\%params));
# use lists of ECDH curves and cipher suites for syntax testing
$node->append_conf('sslconfig.conf', 'ssl_groups=prime256v1:secp521r1');
$node->append_conf('sslconfig.conf', 'ssl_groups=X25519:prime256v1:secp521r1');
$node->append_conf('sslconfig.conf',
'ssl_tls13_ciphers=TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256');