Allow specifying CRL directory

Add another method to specify CRLs, hashed directory method, for both
server and client side.  This offers a means for server or libpq to
load only CRLs that are required to verify a certificate.  The CRL
directory is specifed by separate GUC variables or connection options
ssl_crl_dir and sslcrldir, alongside the existing ssl_crl_file and
sslcrl, so both methods can be used at the same time.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/20200731.173911.904649928639357911.horikyota.ntt@gmail.com

2 files changed, 43 insertions, 3 deletions

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 7928de4e7c..864f6e209f 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -17,7 +17,7 @@ if ($ENV{with_ssl} ne 'openssl')
 }
 else
 {
-	plan tests => 93;
+	plan tests => 100;
 }
 
 #### Some configuration
@@ -215,12 +215,25 @@ test_connect_fails(
 	qr/SSL error/,
 	"CRL belonging to a different CA");
 
+# The same for CRL directory
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
+	qr/SSL error/,
+	"directory CRL belonging to a different CA");
+
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
 	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
 	"CRL with a non-revoked cert");
 
+# The same for CRL directory
+test_connect_ok(
+	$common_connstr,
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"directory CRL with a non-revoked cert");
+
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
@@ -346,7 +359,12 @@ test_connect_fails(
 	$common_connstr,
 	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
 	qr/SSL error/,
-	"does not connect with client-side CRL");
+	"does not connect with client-side CRL file");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	qr/SSL error/,
+	"does not connect with client-side CRL directory");
 
 # pg_stat_ssl
 command_like(
@@ -545,6 +563,16 @@ test_connect_ok(
 test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
 	qr/SSL error/, "intermediate client certificate is missing");
 
+# test server-side CRL directory
+switch_server_cert($node, 'server-cn-only', undef, undef, 'root+client-crldir');
+
+# revoked client cert
+test_connect_fails(
+	$common_connstr,
+	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	qr/SSL error/,
+	"certificate authorization fails with revoked client cert with server-side CRL directory");
+
 # clean up
 foreach my $key (@keys)
 {
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSLServer.pm
index f5987a003e..5ec5e0dac8 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSLServer.pm
@@ -150,6 +150,8 @@ sub configure_test_server_for_ssl
 	copy_files("ssl/root+client_ca.crt", $pgdata);
 	copy_files("ssl/root_ca.crt",        $pgdata);
 	copy_files("ssl/root+client.crl",    $pgdata);
+	mkdir("$pgdata/root+client-crldir");
+	copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -167,14 +169,24 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $crlfile  = "root+client.crl";
+	my $crldir;
 	my $pgdata   = $node->data_dir;
 
+	# defaults to use crl file
+	if (defined $_[3] || defined $_[4])
+	{
+		$crlfile = $_[3];
+		$crldir = $_[4];
+	}
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
 	print $sslconf "ssl_ca_file='$cafile.crt'\n";
 	print $sslconf "ssl_cert_file='$certfile.crt'\n";
 	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
+	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
 	close $sslconf;
 
 	$node->restart;