From 2f91e7bb5643b3a828ee62dee51893a48fe1d080 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Tue, 28 Jul 2015 21:39:40 +0200 Subject: Disable ssl renegotiation by default. While postgres' use of SSL renegotiation is a good idea in theory, it turned out to not work well in practice. The specification and openssl's implementation of it have lead to several security issues. Postgres' use of renegotiation also had its share of bugs. Additionally OpenSSL has a bunch of bugs around renegotiation, reported and open for years, that regularly lead to connections breaking with obscure error messages. We tried increasingly complex workarounds to get around these bugs, but we didn't find anything complete. Since these connection breakages often lead to hard to debug problems, e.g. spuriously failing base backups and significant latency spikes when synchronous replication is used, we have decided to change the default setting for ssl renegotiation to 0 (disabled) in the released backbranches and remove it entirely in 9.5 and master.. Author: Michael Paquier, with changes by me Discussion: 20150624144148.GQ4797@alap3.anarazel.de Backpatch: 9.0-9.4; 9.5 and master get a different patch --- src/backend/utils/misc/postgresql.conf.sample | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/backend/utils/misc/postgresql.conf.sample') diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index 6fe69246580..9042b399fa7 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -80,7 +80,7 @@ #ssl = off # (change requires restart) #ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH' # allowed SSL ciphers # (change requires restart) -#ssl_renegotiation_limit = 512MB # amount of data between renegotiations +#ssl_renegotiation_limit = 0 # amount of data between renegotiations #ssl_cert_file = 'server.crt' # (change requires restart) #ssl_key_file = 'server.key' # (change requires restart) #ssl_ca_file = '' # (change requires restart) -- cgit v1.2.3