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Add GUC checks for ssl_min_protocol_version and ssl_max_protocol_version

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Mixing incorrect bounds set in the SSL context leads to confusing error
messages generated by OpenSSL which are hard to act on.  New checks are
added within the GUC machinery to improve the user experience as they
apply to any SSL implementation, not only OpenSSL, and doing the checks
beforehand avoids the creation of a SSL during a reload (or startup)
which we know will never be used anyway.

Backpatch down to 12, as those parameters have been introduced by
e73e67c.

Author: Michael Paquier
Reviewed-by: Daniel Gustafsson
Discussion: https://postgr.es/m/20200114035420.GE1515@paquier.xyz
Backpatch-through: 12
This commit is contained in:
Michael Paquier
2020-01-18 12:32:43 +09:00
parent 4b754d6c16
commit 41aadeeb12
2 changed files with 68 additions and 3 deletions
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20
src/test/ssl/t/001_ssltests.pl
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@@ -13,7 +13,7 @@ use SSLServer;
if ($ENV{with_openssl} eq 'yes')
{
plan tests => 84;
plan tests => 86;
}
else
{
@@ -97,6 +97,24 @@ command_ok(
'restart succeeds with password-protected key file');
$node->_update_pid(1);
# Test compatibility of SSL protocols.
# TLSv1.1 is lower than TLSv1.2, so it won't work.
$node->append_conf(
'postgresql.conf',
qq{ssl_min_protocol_version='TLSv1.2'
ssl_max_protocol_version='TLSv1.1'});
command_fails(
[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
'restart fails with incorrect SSL protocol bounds');
# Go back to the defaults, this works.
$node->append_conf(
'postgresql.conf',
qq{ssl_min_protocol_version='TLSv1.2'
ssl_max_protocol_version=''});
command_ok(
[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
'restart succeeds with correct SSL protocol bounds');
### Run client-side tests.
###
### Test that libpq accepts/rejects the connection correctly, depending