[crypto] Add support for iPAddress subject alternative names

Originally-implemented-by: Jarrod Johnson <jarrod.b.johnson@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/x509.c

@@ -33,6 +33,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/rsa.h>
 #include <ipxe/rootcert.h>
 #include <ipxe/certstore.h>
+#include <ipxe/socket.h>
+#include <ipxe/in.h>
 #include <ipxe/x509.h>
 #include <config/crypto.h>
 
@@ -1417,6 +1419,57 @@ static int x509_check_dnsname ( struct x509_certificate *cert,
 	return 0;
 }
 
+/**
+ * Check X.509 certificate alternative iPAddress
+ *
+ * @v cert		X.509 certificate
+ * @v raw		ASN.1 cursor
+ * @v name		Name
+ * @ret rc		Return status code
+ */
+static int x509_check_ipaddress ( struct x509_certificate *cert,
+				  const struct asn1_cursor *raw,
+				  const char *name ) {
+	struct sockaddr sa;
+	sa_family_t family;
+	const void *address;
+	int rc;
+
+	/* Determine address family */
+	if ( raw->len == sizeof ( struct in_addr ) ) {
+		struct sockaddr_in *sin = ( ( struct sockaddr_in * ) &sa );
+		family = AF_INET;
+		address = &sin->sin_addr;
+	} else if ( raw->len == sizeof ( struct in6_addr ) ) {
+		struct sockaddr_in6 *sin6 = ( ( struct sockaddr_in6 * ) &sa );
+		family = AF_INET6;
+		address = &sin6->sin6_addr;
+	} else {
+		DBGC ( cert, "X509 %p \"%s\" has iPAddress with unexpected "
+		       "length %zd\n", cert, x509_name ( cert ), raw->len );
+		DBGC_HDA ( cert, 0, raw->data, raw->len );
+		return -EINVAL;
+	}
+
+	/* Attempt to convert name to a socket address */
+	if ( ( rc = sock_aton ( name, &sa ) ) != 0 ) {
+		DBGC2 ( cert, "X509 %p \"%s\" cannot parse \"%s\" as "
+			"iPAddress: %s\n", cert, x509_name ( cert ), name,
+			strerror ( rc ) );
+		return rc;
+	}
+	if ( sa.sa_family != family )
+		return -ENOENT;
+
+	/* Compare addresses */
+	if ( memcmp ( address, raw->data, raw->len ) != 0 )
+		return -ENOENT;
+
+	DBGC2 ( cert, "X509 %p \"%s\" found iPAddress match for \"%s\"\n",
+		cert, x509_name ( cert ), sock_ntoa ( &sa ) );
+	return 0;
+}
+
 /**
  * Check X.509 certificate alternative name
  *
@@ -1440,6 +1493,8 @@ static int x509_check_alt_name ( struct x509_certificate *cert,
 	switch ( type ) {
 	case X509_GENERAL_NAME_DNS :
 		return x509_check_dnsname ( cert, &alt_name, name );
+	case X509_GENERAL_NAME_IP :
+		return x509_check_ipaddress ( cert, &alt_name, name );
 	default:
 		DBGC2 ( cert, "X509 %p \"%s\" unknown name of type %#02x:\n",
 			cert, x509_name ( cert ), type );

src/include/ipxe/x509.h

@@ -146,6 +146,7 @@ struct x509_subject_alt_name {
 enum x509_general_name_types {
 	X509_GENERAL_NAME_DNS = ASN1_IMPLICIT_TAG ( 2 ),
 	X509_GENERAL_NAME_URI = ASN1_IMPLICIT_TAG ( 6 ),
+	X509_GENERAL_NAME_IP = ASN1_IMPLICIT_TAG ( 7 ),
 };
 
 /** An X.509 certificate extensions set */

src/tests/x509_test.c

@@ -413,8 +413,8 @@ CERTIFICATE ( useless_crt,
  * issuer	iPXE self-test leaf CA
  */
 CERTIFICATE ( server_crt,
-	DATA ( 0x30, 0x82, 0x02, 0xba, 0x30, 0x82, 0x02, 0x23, 0xa0, 0x03,
-	       0x02, 0x01, 0x02, 0x02, 0x01, 0x18, 0x30, 0x0d, 0x06, 0x09,
+	DATA ( 0x30, 0x82, 0x02, 0xd2, 0x30, 0x82, 0x02, 0x3b, 0xa0, 0x03,
+	       0x02, 0x01, 0x02, 0x02, 0x01, 0x1e, 0x30, 0x0d, 0x06, 0x09,
 	       0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05,
 	       0x00, 0x30, 0x81, 0x88, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03,
 	       0x55, 0x04, 0x06, 0x13, 0x02, 0x47, 0x42, 0x31, 0x17, 0x30,
@@ -431,9 +431,9 @@ CERTIFICATE ( server_crt,
 	       0x58, 0x45, 0x20, 0x73, 0x65, 0x6c, 0x66, 0x2d, 0x74, 0x65,
 	       0x73, 0x74, 0x20, 0x6c, 0x65, 0x61, 0x66, 0x20, 0x43, 0x41,
 	       0x30, 0x1e, 0x17, 0x0d, 0x31, 0x32, 0x30, 0x33, 0x30, 0x35,
-	       0x31, 0x33, 0x34, 0x35, 0x30, 0x30, 0x5a, 0x17, 0x0d, 0x31,
+	       0x31, 0x33, 0x34, 0x35, 0x30, 0x35, 0x5a, 0x17, 0x0d, 0x31,
 	       0x33, 0x30, 0x33, 0x30, 0x35, 0x31, 0x33, 0x34, 0x35, 0x30,
-	       0x30, 0x5a, 0x30, 0x81, 0x84, 0x31, 0x0b, 0x30, 0x09, 0x06,
+	       0x35, 0x5a, 0x30, 0x81, 0x84, 0x31, 0x0b, 0x30, 0x09, 0x06,
 	       0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x47, 0x42, 0x31, 0x17,
 	       0x30, 0x15, 0x06, 0x03, 0x55, 0x04, 0x08, 0x0c, 0x0e, 0x43,
 	       0x61, 0x6d, 0x62, 0x72, 0x69, 0x64, 0x67, 0x65, 0x73, 0x68,
@@ -449,45 +449,47 @@ CERTIFICATE ( server_crt,
 	       0x70, 0x78, 0x65, 0x2e, 0x6f, 0x72, 0x67, 0x30, 0x81, 0x9f,
 	       0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
 	       0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81, 0x8d, 0x00, 0x30,
-	       0x81, 0x89, 0x02, 0x81, 0x81, 0x00, 0x9d, 0x87, 0xe4, 0xa7,
-	       0xcf, 0x12, 0x08, 0x43, 0x4c, 0x90, 0x8b, 0x10, 0x7d, 0xcc,
-	       0x94, 0x1e, 0x5e, 0xef, 0xa7, 0x90, 0xbc, 0xe8, 0xe4, 0xee,
-	       0xd9, 0xb4, 0xd9, 0x63, 0x55, 0xc7, 0x03, 0x98, 0x42, 0xd7,
-	       0x4e, 0xaf, 0xd7, 0xdc, 0x40, 0x83, 0x61, 0x1b, 0xcc, 0x7b,
-	       0xf5, 0x1d, 0xba, 0x9f, 0x66, 0xfb, 0xe7, 0x42, 0xbd, 0xd7,
-	       0xac, 0xeb, 0x3c, 0xa2, 0x99, 0x6a, 0xe4, 0x8f, 0xb4, 0x06,
-	       0x4e, 0xc3, 0x3b, 0x62, 0xcd, 0x6a, 0x30, 0x0a, 0xe0, 0xb1,
-	       0x50, 0x83, 0x77, 0xc4, 0x97, 0x15, 0xc4, 0x7c, 0x40, 0xb8,
-	       0x60, 0x39, 0x07, 0x72, 0x4b, 0xd2, 0x61, 0x5c, 0xd0, 0xac,
-	       0x21, 0x9b, 0x85, 0xba, 0x53, 0x39, 0x1d, 0xef, 0xe9, 0xb7,
-	       0x69, 0xed, 0x7f, 0x1c, 0x38, 0x56, 0x0a, 0xe5, 0x24, 0xd0,
-	       0x1a, 0xa5, 0x9a, 0xd2, 0x5e, 0x1b, 0x47, 0x42, 0x49, 0x08,
-	       0x0d, 0x68, 0x2d, 0xc9, 0x02, 0x03, 0x01, 0x00, 0x01, 0xa3,
-	       0x36, 0x30, 0x34, 0x30, 0x32, 0x06, 0x03, 0x55, 0x1d, 0x11,
-	       0x04, 0x2b, 0x30, 0x29, 0x82, 0x12, 0x64, 0x65, 0x6d, 0x6f,
+	       0x81, 0x89, 0x02, 0x81, 0x81, 0x00, 0xac, 0x7b, 0x54, 0xc1,
+	       0x97, 0x4d, 0x56, 0xbd, 0xb2, 0x52, 0xb3, 0x5c, 0x1b, 0x28,
+	       0xae, 0x91, 0x33, 0xf0, 0xc8, 0xc2, 0x3c, 0x7d, 0xe8, 0x95,
+	       0x72, 0xaf, 0xfe, 0xa1, 0x68, 0xe1, 0xbd, 0xe2, 0x9d, 0x4c,
+	       0xe8, 0x95, 0x56, 0x94, 0xce, 0x47, 0x57, 0x1b, 0xb1, 0x08,
+	       0xa1, 0x5b, 0x02, 0x8f, 0x56, 0x75, 0x1e, 0x4f, 0xfd, 0xc5,
+	       0x87, 0x5c, 0x1c, 0x3f, 0xab, 0x4f, 0xba, 0x25, 0x14, 0x6d,
+	       0xe3, 0xa2, 0x47, 0x33, 0xd0, 0x78, 0x63, 0xcc, 0x11, 0x37,
+	       0x08, 0x73, 0x25, 0x42, 0x20, 0xa9, 0x57, 0x29, 0xeb, 0x44,
+	       0x80, 0x0d, 0xe6, 0x76, 0x4b, 0x02, 0x8b, 0x67, 0xb2, 0x99,
+	       0xfe, 0xb3, 0x44, 0x62, 0xdf, 0x34, 0x0e, 0xf3, 0xe2, 0x17,
+	       0x42, 0x8f, 0x36, 0x42, 0x5a, 0x1c, 0x03, 0x3e, 0x06, 0x0d,
+	       0x5e, 0x08, 0x52, 0xd1, 0x06, 0xfb, 0xa9, 0xdb, 0x13, 0x15,
+	       0x08, 0x6d, 0x03, 0x85, 0x02, 0x03, 0x01, 0x00, 0x01, 0xa3,
+	       0x4e, 0x30, 0x4c, 0x30, 0x4a, 0x06, 0x03, 0x55, 0x1d, 0x11,
+	       0x04, 0x43, 0x30, 0x41, 0x82, 0x12, 0x64, 0x65, 0x6d, 0x6f,
 	       0x2e, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x69, 0x70, 0x78, 0x65,
 	       0x2e, 0x6f, 0x72, 0x67, 0x82, 0x13, 0x2a, 0x2e, 0x61, 0x6c,
 	       0x74, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x69, 0x70, 0x78,
-	       0x65, 0x2e, 0x6f, 0x72, 0x67, 0x30, 0x0d, 0x06, 0x09, 0x2a,
-	       0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00,
-	       0x03, 0x81, 0x81, 0x00, 0x23, 0x16, 0x6a, 0x10, 0x55, 0x44,
-	       0xb9, 0x9d, 0x9f, 0x9f, 0x53, 0x51, 0x3d, 0x7d, 0x33, 0xa1,
-	       0x84, 0xb2, 0x5a, 0xfb, 0x1d, 0x76, 0xd5, 0xb1, 0x79, 0x66,
-	       0xf5, 0xe3, 0xa6, 0x58, 0x2e, 0x3d, 0xec, 0x9f, 0xcf, 0x7d,
-	       0x75, 0x3b, 0xd7, 0xe8, 0xf6, 0x96, 0xd7, 0xdd, 0x89, 0x1e,
-	       0x30, 0x25, 0xd9, 0xbb, 0xc0, 0x99, 0xc0, 0x1f, 0x1b, 0x4f,
-	       0xa6, 0x8e, 0xd5, 0x76, 0x50, 0x18, 0xa1, 0x7a, 0x48, 0x08,
-	       0xd5, 0x75, 0xee, 0x20, 0x82, 0x12, 0xc0, 0xe8, 0xeb, 0xf1,
-	       0x50, 0xee, 0x9d, 0xbd, 0x73, 0x7c, 0xb5, 0x13, 0x05, 0x91,
-	       0x1f, 0xc6, 0x50, 0x08, 0xbc, 0x98, 0xde, 0x43, 0x9a, 0xa4,
-	       0x9f, 0x69, 0xf7, 0x6e, 0x36, 0x20, 0x42, 0x80, 0x72, 0xba,
-	       0x0d, 0x63, 0x4c, 0xc5, 0x00, 0x0d, 0x85, 0xaa, 0x14, 0x38,
-	       0x28, 0x11, 0x3e, 0xa2, 0xcc, 0xc2, 0xac, 0xe8, 0xa7, 0xbe,
-	       0x0a, 0xa0 ),
-	FINGERPRINT ( 0x2f, 0xd3, 0xe0, 0x69, 0xde, 0xbc, 0x7c, 0x39,
-		      0xa7, 0xee, 0x23, 0x3b, 0xf5, 0x92, 0xf5, 0xbe,
-		      0x05, 0xab, 0xb5, 0xf8, 0x42, 0x9e, 0xf5, 0x9c,
-		      0x24, 0xde, 0x9e, 0x1f, 0xeb, 0xed, 0xd1, 0x20 ) );
+	       0x65, 0x2e, 0x6f, 0x72, 0x67, 0x87, 0x04, 0xc0, 0xa8, 0x00,
+	       0x01, 0x87, 0x10, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+	       0x00, 0x00, 0x00, 0x69, 0xff, 0xfe, 0x50, 0x58, 0x45, 0x30,
+	       0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01,
+	       0x01, 0x05, 0x05, 0x00, 0x03, 0x81, 0x81, 0x00, 0x63, 0x83,
+	       0xf5, 0xde, 0xf7, 0x59, 0x81, 0xd3, 0x34, 0x61, 0xfd, 0x2c,
+	       0x0c, 0xec, 0x1c, 0x25, 0xd2, 0x2c, 0xe8, 0x90, 0x4f, 0x34,
+	       0x43, 0x2c, 0x86, 0x18, 0x9e, 0x66, 0x26, 0x0d, 0x02, 0x2a,
+	       0xea, 0x28, 0xc6, 0xbb, 0x51, 0x02, 0xbe, 0x8f, 0x51, 0x50,
+	       0xc7, 0x04, 0x49, 0x97, 0xb9, 0xd4, 0xa5, 0x74, 0x39, 0xaa,
+	       0x22, 0xbb, 0x4e, 0x46, 0x57, 0x15, 0x0e, 0xcf, 0x64, 0x60,
+	       0xc8, 0x13, 0xdf, 0x82, 0x09, 0x3b, 0x92, 0xf5, 0x69, 0x80,
+	       0xd2, 0x5e, 0x53, 0x9d, 0x3a, 0xcd, 0x9e, 0x81, 0xa1, 0xbd,
+	       0x5b, 0x66, 0x89, 0x4d, 0xf7, 0xa4, 0xd6, 0x92, 0xe4, 0xe1,
+	       0x80, 0x87, 0xfa, 0xa5, 0x47, 0x25, 0x9c, 0x35, 0x77, 0xa5,
+	       0x11, 0x1b, 0x48, 0x4c, 0x5e, 0x5e, 0x2f, 0xc7, 0xf8, 0x78,
+	       0x4c, 0x36, 0x41, 0xfb, 0x91, 0x5d, 0xf6, 0x43, 0x99, 0x7c,
+	       0xcd, 0x7f, 0x27, 0x4c, 0x75, 0xca ),
+	FINGERPRINT ( 0x82, 0xd3, 0xa0, 0x4c, 0x0d, 0x7d, 0x3c, 0xb1,
+		      0x90, 0x63, 0xd8, 0xef, 0x1e, 0xd2, 0xdd, 0x10,
+		      0xd5, 0x89, 0x40, 0x35, 0xb9, 0x5e, 0x98, 0x44,
+		      0x30, 0xa2, 0x48, 0x9a, 0xb8, 0x2f, 0xcf, 0xe3 ) );
 
 /*
  * subject	not.a.ca.test.ipxe.org
@@ -1033,6 +1035,11 @@ static void x509_test_exec ( void ) {
 	x509_check_name_fail_ok ( &server_crt, "ipxe.org" );
 	x509_check_name_fail_ok ( &server_crt, "org" );
 	x509_check_name_fail_ok ( &server_crt, "" );
+	x509_check_name_ok ( &server_crt, "192.168.0.1" );
+	x509_check_name_fail_ok ( &server_crt, "192.168.0.2" );
+	x509_check_name_ok ( &server_crt, "fe80::69ff:fe50:5845" );
+	x509_check_name_ok ( &server_crt, "FE80:0:0:0:0:69FF:FE50:5845" );
+	x509_check_name_fail_ok ( &server_crt, "fe80::69ff:fe50:5846" );
 
 	/* Parse all certificate chains */
 	x509_chain_ok ( &server_chain );
@@ -1101,3 +1108,5 @@ struct self_test x509_test __self_test = {
 REQUIRE_OBJECT ( rsa );
 REQUIRE_OBJECT ( sha1 );
 REQUIRE_OBJECT ( sha256 );
+REQUIRE_OBJECT ( ipv4 );
+REQUIRE_OBJECT ( ipv6 );