Support TLS client authentication Extended Key Usage in x509 generation

src/charon/plugins/stroke/stroke_list.c

@@ -699,7 +699,8 @@ static void stroke_list_certs(linked_list_t *list, char *label,
 	x509_flag_t flag_mask;
 
 	/* mask all auxiliary flags */
-	flag_mask = ~(X509_SELF_SIGNED | X509_SERVER_AUTH | X509_IP_ADDR_BLOCKS ); 
+	flag_mask = ~(X509_SERVER_AUTH | X509_CLIENT_AUTH |
+				  X509_SELF_SIGNED | X509_IP_ADDR_BLOCKS );
 
 	enumerator = list->create_enumerator(list);
 	while (enumerator->enumerate(enumerator, (void**)&cert))

src/libstrongswan/asn1/oid.txt

@@ -191,7 +191,7 @@
               0x02           "unotice"
             0x03             "id-kp"
               0x01           "serverAuth"				OID_SERVER_AUTH
-              0x02           "clientAuth"
+              0x02           "clientAuth"				OID_CLIENT_AUTH
               0x03           "codeSigning"
               0x04           "emailProtection"
               0x05           "ipsecEndSystem"

src/libstrongswan/credentials/certificates/x509.c

@@ -15,12 +15,14 @@
 
 #include "x509.h"
 
-ENUM(x509_flag_names, X509_NONE, X509_SELF_SIGNED,
+ENUM(x509_flag_names, X509_NONE, X509_IP_ADDR_BLOCKS,
 	"X509_NONE",
 	"X509_CA",
 	"X509_AA",
 	"X509_OCSP_SIGNER",
 	"X509_SERVER_AUTH",
+	"X509_CLIENT_AUTH",
 	"X509_SELF_SIGNED",
+	"X509_IP_ADDR_BLOCKS",
 );
 

src/libstrongswan/credentials/certificates/x509.h

@@ -35,19 +35,21 @@ typedef enum x509_flag_t x509_flag_t;
  */
 enum x509_flag_t {
 	/** cert has no constraints */
-	X509_NONE =			   0, 
+	X509_NONE =				0,
 	/** cert has CA constraint */
-	X509_CA = 			  (1<<0),
+	X509_CA = 				(1<<0),
 	/** cert has AA constraint */
-	X509_AA = 			  (1<<1),
+	X509_AA = 				(1<<1),
 	/** cert has OCSP signer constraint */
-	X509_OCSP_SIGNER = 	  (1<<2),
+	X509_OCSP_SIGNER = 		(1<<2),
-	/** cert has serverAuth constraint */
+	/** cert has serverAuth key usage */
-	X509_SERVER_AUTH = 	  (1<<3),
+	X509_SERVER_AUTH = 		(1<<3),
+	/** cert has clientAuth key usage */
+	X509_CLIENT_AUTH =		(1<<4),
 	/** cert is self-signed */
-	X509_SELF_SIGNED =    (1<<4),
+	X509_SELF_SIGNED =		(1<<5),
 	/** cert has an ipAddrBlocks extension */
-	X509_IP_ADDR_BLOCKS = (1<<5),
+	X509_IP_ADDR_BLOCKS =	(1<<6),
 };
 
 /**

src/libstrongswan/plugins/x509/x509_cert.c

@@ -596,6 +596,9 @@ static void parse_extendedKeyUsage(chunk_t blob, int level0,
 				case OID_SERVER_AUTH:
 					this->flags |= X509_SERVER_AUTH;
 					break;
+				case OID_CLIENT_AUTH:
+					this->flags |= X509_CLIENT_AUTH;
+					break;
 				case OID_OCSP_SIGNING:
 					this->flags |= X509_OCSP_SIGNER;
 					break;
@@ -1476,7 +1479,8 @@ static bool generate(private_x509_cert_t *cert, certificate_t *sign_cert,
 					 private_key_t *sign_key, int digest_alg)
 {
 	chunk_t extensions = chunk_empty, extendedKeyUsage = chunk_empty;
-	chunk_t serverAuth = chunk_empty, ocspSigning = chunk_empty;
+	chunk_t serverAuth = chunk_empty, clientAuth = chunk_empty;
+	chunk_t ocspSigning = chunk_empty;
 	chunk_t basicConstraints = chunk_empty, subjectAltNames = chunk_empty;
 	chunk_t subjectKeyIdentifier = chunk_empty, authKeyIdentifier = chunk_empty;
 	chunk_t crlDistributionPoints = chunk_empty, authorityInfoAccess = chunk_empty;
@@ -1606,6 +1610,10 @@ static bool generate(private_x509_cert_t *cert, certificate_t *sign_cert,
 	{
 		serverAuth = asn1_build_known_oid(OID_SERVER_AUTH);
 	}
+	if (cert->flags & X509_CLIENT_AUTH)
+	{
+		clientAuth = asn1_build_known_oid(OID_CLIENT_AUTH);
+	}
 
 	/* add ocspSigning extendedKeyUsage flag */
 	if (cert->flags & X509_OCSP_SIGNER)
@@ -1613,13 +1621,13 @@ static bool generate(private_x509_cert_t *cert, certificate_t *sign_cert,
 		ocspSigning = asn1_build_known_oid(OID_OCSP_SIGNING);
 	}
 
-	if (serverAuth.ptr || ocspSigning.ptr)
+	if (serverAuth.ptr || clientAuth.ptr || ocspSigning.ptr)
 	{
 		extendedKeyUsage = asn1_wrap(ASN1_SEQUENCE, "mm",
 								asn1_build_known_oid(OID_EXTENDED_KEY_USAGE),
 								asn1_wrap(ASN1_OCTET_STRING, "m",
-									asn1_wrap(ASN1_SEQUENCE, "mm",
+									asn1_wrap(ASN1_SEQUENCE, "mmm",
-										serverAuth, ocspSigning)));
+										serverAuth, clientAuth, ocspSigning)));
 	}
 
 	/* add subjectKeyIdentifier to CA and OCSP signer certificates */

src/pki/commands/issue.c

@@ -112,6 +112,10 @@ static int issue()
 				{
 					flags |= X509_SERVER_AUTH;
 				}
+				else if (streq(arg, "clientAuth"))
+				{
+					flags |= X509_CLIENT_AUTH;
+				}
 				else if (streq(arg, "ocspSigning"))
 				{
 					flags |= X509_OCSP_SIGNER;
@@ -342,7 +346,7 @@ static void __attribute__ ((constructor))reg()
 		{"[--in file] [--type pub|pkcs10]",
 		 " --cacert file --cakey file --dn subject-dn [--san subjectAltName]+",
 		 "[--lifetime days] [--serial hex] [--crl uri]+ [--ocsp uri]+",
-		 "[--ca] [--pathlen len] [--flag serverAuth|ocspSigning]+",
+		 "[--ca] [--pathlen len] [--flag serverAuth|clientAuth|ocspSigning]+",
 		 "[--digest md5|sha1|sha224|sha256|sha384|sha512]"},
 		{
 			{"help",	'h', 0, "show usage information"},