Add SSL tests for IP addresses in certificates

This tests some scenarios that already work.  A subsequent patch will
introduce more functionality.

Author: Jacob Champion <pchampion@vmware.com>
Co-authored-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Co-authored-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/9f5f20974cd3a4091a788cf7f00ab663d5fcdffe.camel@vmware.com

Author: 3 people

src/test/ssl/conf/server-ip-cn-only.config

@@ -0,0 +1,12 @@
+# An OpenSSL format CSR config file for creating a server certificate.
+#
+
+[ req ]
+distinguished_name     = req_distinguished_name
+prompt                 = no
+
+[ req_distinguished_name ]
+CN = 192.0.2.1
+OU = PostgreSQL test suite
+
+# No Subject Alternative Names

src/test/ssl/conf/server-ip-in-dnsname.config

@@ -0,0 +1,18 @@
+# An OpenSSL format CSR config file for creating a server certificate.
+#
+
+[ req ]
+distinguished_name     = req_distinguished_name
+req_extensions         = v3_req
+prompt                 = no
+
+[ req_distinguished_name ]
+OU = PostgreSQL test suite
+
+# For Subject Alternative Names
+[ v3_req ]
+subjectAltName = @alt_names
+
+# Normally IP addresses should not go into a dNSName.
+[ alt_names ]
+DNS.1 = 192.0.2.1

src/test/ssl/ssl/server-ip-cn-only.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC8TCCAdkCCCAhESkRN1IAMA0GCSqGSIb3DQEBCwUAMEIxQDA+BgNVBAMMN1Rl
+c3QgQ0EgZm9yIFBvc3RncmVTUUwgU1NMIHJlZ3Jlc3Npb24gdGVzdCBzZXJ2ZXIg
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+-----END CERTIFICATE-----

src/test/ssl/ssl/server-ip-cn-only.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEA1azW5QvvWcdgX1mPqn4zcylgO/HfaIKNV20flraqlJYddODS
+tHx0tfTL3Zy85i8xcdFqNlPVq+kevx2ig9hJVpekYwo28X9CL5YVii9Fs/a+Z3XK
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+-----END RSA PRIVATE KEY-----

src/test/ssl/ssl/server-ip-in-dnsname.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC/DCCAeSgAwIBAgIIICIDFRVYUgAwDQYJKoZIhvcNAQELBQAwQjFAMD4GA1UE
+Aww3VGVzdCBDQSBmb3IgUG9zdGdyZVNRTCBTU0wgcmVncmVzc2lvbiB0ZXN0IHNl
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+-----END CERTIFICATE-----

src/test/ssl/ssl/server-ip-in-dnsname.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAymfls/X858FBH/K86Q4HPECsTWPVhKFVralyPz3r4JUMSBU3
+keW7PsodT8ljM1kIAdvlYAe69fEp6iPhOLlt7Uqyo7SY3Wn5Ew3tWUKkKlvQBZPP
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+-----END RSA PRIVATE KEY-----

src/test/ssl/sslfiles.mk

@@ -23,6 +23,8 @@
 #
 SERVERS := server-cn-and-alt-names \
 	server-cn-only \
+	server-ip-cn-only \
+	server-ip-in-dnsname \
 	server-single-alt-name \
 	server-multiple-alt-names \
 	server-no-names \

src/test/ssl/t/001_ssltests.pl

@@ -229,6 +229,30 @@ sub switch_server_cert
 	  qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/
 );
 
+# Test with an IP address in the Common Name. This is a strange corner case that
+# nevertheless is supported, as long as the address string matches exactly.
+switch_server_cert($node, certfile => 'server-ip-cn-only');
+
+$common_connstr =
+  "$default_ssl_connstr user=ssltestuser dbname=trustdb sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+
+$node->connect_ok("$common_connstr host=192.0.2.1",
+	"IP address in the Common Name");
+
+$node->connect_fails(
+	"$common_connstr host=192.000.002.001",
+	"mismatch between host name and server certificate IP address",
+	expected_stderr =>
+	  qr/\Qserver certificate for "192.0.2.1" does not match host name "192.000.002.001"\E/
+);
+
+# Similarly, we'll also match an IP address in a dNSName SAN. (This is
+# long-standing behavior.)
+switch_server_cert($node, certfile => 'server-ip-in-dnsname');
+
+$node->connect_ok("$common_connstr host=192.0.2.1",
+	"IP address in a dNSName");
+
 # Test Subject Alternative Names.
 switch_server_cert($node, certfile => 'server-multiple-alt-names');
 
@@ -281,7 +305,7 @@ sub switch_server_cert
 	  qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/
 );
 
-# Test server certificate with a CN and SANs. Per RFCs 2818 and 6125, the CN
+# Test server certificate with a CN and DNS SANs. Per RFCs 2818 and 6125, the CN
 # should be ignored when the certificate has both.
 switch_server_cert($node, certfile => 'server-cn-and-alt-names');