Add CRL support.

Allow Kore to use per domain CRLs when requiring client certificates.
The require_client_cert configuration option has been renamed to a more
sane client_certificates and can optionally take a second argument
which is the CRL in pem format.

You'll need a restart in case the CRLs get updated.

conf/kore.conf.example

@@ -116,9 +116,9 @@ authentication auth_example {
 #
 #	accesslog
 #		- File where all requests are logged.
-#	require_client_cert
-#		- Asks the client to present a certificate
-#		matching the CA given to require_client_cert
+#	client_certificates [CA] [optional CRL]
+#		- Require client certificates to be sent for the given
+#		  CA with an optional CRL file.
 #
 # Handlers
 #
@@ -176,7 +176,7 @@ domain localhost {
 #	certfile		cert/other/server.crt
 #	certkey			cert/other/server.key
 #	accesslog		/var/log/other_kore_access.log
-#	require_client_cert	cert/other/ca.crt
+#	client_certificates	cert/other/ca.crt
 
 #	static		/css/style.css		serve_style_css
 #	static		/			serve_index

includes/kore.h

@@ -263,6 +263,7 @@ struct kore_domain {
 	char					*certfile;
 	char					*certkey;
 	char					*cafile;
+	char					*crlfile;
 	int					accesslog;
 	SSL_CTX					*ssl_ctx;
 	TAILQ_HEAD(, kore_module_handle)	handlers;
@@ -436,6 +437,7 @@ void		kore_module_onload(void);
 int		kore_module_loaded(void);
 void		kore_domain_closelogs(void);
 void		*kore_module_getsym(const char *);
+void		kore_domain_load_crl(void);
 void		kore_module_load(const char *, const char *);
 void		kore_domain_sslstart(struct kore_domain *);
 int		kore_module_handler_new(const char *, const char *,

src/config.c

@@ -55,7 +55,7 @@ static int		configure_http_keepalive_time(char **);
 static int		configure_validator(char **);
 static int		configure_params(char **);
 static int		configure_validate(char **);
-static int		configure_require_client_cert(char **);
+static int		configure_client_certificates(char **);
 static int		configure_authentication(char **);
 static int		configure_authentication_uri(char **);
 static int		configure_authentication_type(char **);
@@ -92,7 +92,7 @@ static struct {
 	{ "accesslog",			configure_accesslog },
 	{ "certfile",			configure_certfile },
 	{ "certkey",			configure_certkey },
-	{ "require_client_cert",	configure_require_client_cert },
+	{ "client_certificates",	configure_client_certificates },
 	{ "http_header_max",		configure_http_header_max },
 	{ "http_body_max",		configure_http_body_max },
 	{ "http_hsts_enable",		configure_http_hsts_enable },
@@ -370,10 +370,10 @@ configure_handler(char **argv)
 }
 
 static int
-configure_require_client_cert(char **argv)
+configure_client_certificates(char **argv)
 {
 	if (current_domain == NULL) {
-		printf("missing domain page require_client_cert\n");
+		printf("missing domain for require_client_cert\n");
 		return (KORE_RESULT_ERROR);
 	}
 
@@ -389,6 +389,9 @@ configure_require_client_cert(char **argv)
 	}
 
 	current_domain->cafile = kore_strdup(argv[1]);
+	if (argv[2] != NULL)
+		current_domain->crlfile = kore_strdup(argv[2]);
+
 	return (KORE_RESULT_OK);
 }
 

src/domain.c

@@ -24,6 +24,8 @@ struct kore_domain_h		domains;
 struct kore_domain		*primary_dom = NULL;
 DH				*ssl_dhparam = NULL;
 
+static void	domain_load_crl(struct kore_domain *);
+
 void
 kore_domain_init(void)
 {
@@ -61,7 +63,6 @@ kore_domain_sslstart(struct kore_domain *dom)
 {
 #if !defined(KORE_BENCHMARK)
 	STACK_OF(X509_NAME)	*certs;
-
 #if !defined(OPENSSL_NO_EC)
 	EC_KEY		*ecdh;
 #endif
@@ -164,3 +165,42 @@ kore_domain_closelogs(void)
 	TAILQ_FOREACH(dom, &domains, list)
 		close(dom->accesslog);
 }
+
+void
+kore_domain_load_crl(void)
+{
+	struct kore_domain	*dom;
+
+	TAILQ_FOREACH(dom, &domains, list)
+		domain_load_crl(dom);
+}
+
+static void
+domain_load_crl(struct kore_domain *dom)
+{
+	X509_STORE		*store;
+
+	ERR_clear_error();
+
+	if (dom->cafile == NULL)
+		return;
+
+	if (dom->crlfile == NULL) {
+		kore_log(LOG_WARNING, "WARNING: Running without CRL");
+		return;
+	}
+
+	if ((store = SSL_CTX_get_cert_store(dom->ssl_ctx)) == NULL) {
+		kore_log(LOG_ERR, "SSL_CTX_get_cert_store(): %S", ssl_errno_s);
+		return;
+	}
+
+	if (!X509_STORE_load_locations(store, dom->crlfile, NULL)) {
+		kore_log(LOG_ERR, "X509_STORE_load_locations(): %s",
+		    ssl_errno_s);
+		return;
+	}
+
+	X509_STORE_set_flags(store,
+	    X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
+}

src/worker.c

@@ -229,6 +229,7 @@ kore_worker_entry(struct kore_worker *kw)
 	net_init();
 	http_init();
 	kore_connection_init();
+	kore_domain_load_crl();
 	TAILQ_INIT(&disconnected);
 	TAILQ_INIT(&worker_clients);
 
@@ -255,6 +256,7 @@ kore_worker_entry(struct kore_worker *kw)
 				kore_module_reload(1);
 			else if (sig_recv == SIGQUIT || sig_recv == SIGINT)
 				quit = 1;
+
 			sig_recv = 0;
 		}