net: lib: wifi_credentials: Add support for Enterprise security

Add support for configuring enterprise mode security.

Signed-off-by: Ravi Dondaputi <ravi.dondaputi@nordicsemi.no>

subsys/net/lib/wifi_credentials/Kconfig

@@ -73,6 +73,32 @@ config WIFI_CREDENTIALS_CONNECT_STORED_CONNECTION_TIMEOUT
 	help
 	   Wait period before falling back to the next entry in the list of stored SSIDs.
 
+
+if WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
+
+config WIFI_CREDENTIALS_RUNTIME_CERTIFICATES
+	bool "Provide Wi-Fi enterprise security certificates at run-time"
+	select TLS_CREDENTIALS
+	select TLS_CREDENTIALS_SHELL
+	select BASE64
+	default y if WIFI_SHELL_RUNTIME_CERTIFICATES
+	help
+	  This option enables providing Wi-Fi enterprise security certificates at run-time.
+	  Uses the TLS credentials subsystem to store and manage the certificates.
+
+if WIFI_CREDENTIALS_RUNTIME_CERTIFICATES
+
+config HEAP_MEM_POOL_ADD_SIZE_WIFI_CERT
+	int "Wi-Fi enterprise security certificates memory pool size"
+	# STA - 6 certs and each assume 1500 bytes
+	default 12000
+	help
+	   The size of the memory pool used by the Wi-Fi enterprise security certificates.
+
+endif # WIFI_CREDENTIALS_RUNTIME_CERTIFICATES
+
+endif # WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
+
 endif # WIFI_CREDENTIALS_CONNECT_STORED
 
 endif # WIFI_CREDENTIALS

subsys/net/lib/wifi_credentials/wifi_credentials_shell.c

@@ -22,10 +22,33 @@
 
 #include <zephyr/net/wifi_credentials.h>
 
+LOG_MODULE_REGISTER(wifi_credentials_shell, CONFIG_WIFI_CREDENTIALS_LOG_LEVEL);
+
 #define MAX_BANDS_STR_LEN 64
 #define MACSTR "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
 
 #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
+#ifdef CONFIG_WIFI_CREDENTIALS_RUNTIME_CERTIFICATES
+#include <zephyr/net/tls_credentials.h>
+enum wifi_enterprise_cert_sec_tags {
+	WIFI_CERT_CA_SEC_TAG = 0x1020001,
+	WIFI_CERT_CLIENT_KEY_SEC_TAG,
+	WIFI_CERT_SERVER_KEY_SEC_TAG,
+	WIFI_CERT_CLIENT_SEC_TAG,
+	WIFI_CERT_SERVER_SEC_TAG,
+	/* Phase 2 */
+	WIFI_CERT_CA_P2_SEC_TAG,
+	WIFI_CERT_CLIENT_KEY_P2_SEC_TAG,
+	WIFI_CERT_CLIENT_P2_SEC_TAG,
+};
+
+struct wifi_cert_data {
+	enum tls_credential_type type;
+	uint32_t sec_tag;
+	uint8_t **data;
+	size_t *len;
+};
+#else
 static const char ca_cert_test[] = {
 	#include <wifi_enterprise_test_certs/ca.pem.inc>
 	'\0'
@@ -52,25 +75,184 @@ static const char client_cert2_test[] = {
 static const char client_key2_test[] = {
 	#include <wifi_enterprise_test_certs/client-key2.pem.inc>
 	'\0'};
+#endif /* CONFIG_WIFI_CREDENTIALS_RUNTIME_CERTIFICATES */
 #endif /* CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE */
 
 #if defined CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
-static int cmd_wifi_set_enterprise_creds(const struct shell *sh, struct net_if *iface)
+#ifdef CONFIG_WIFI_CREDENTIALS_RUNTIME_CERTIFICATES
+
+struct wifi_enterprise_creds_params enterprise_creds_params;
+
+static int process_certificates(struct wifi_cert_data *certs, size_t cert_count)
+{
+	for (size_t i = 0; i < cert_count; i++) {
+		int err;
+		size_t len = 0;
+		uint8_t *cert_tmp;
+
+		err = tls_credential_get(certs[i].sec_tag, certs[i].type, NULL, &len);
+		if (err != -EFBIG) {
+			LOG_ERR("Failed to get credential tag: %d length, err: %d",
+				certs[i].sec_tag, err);
+			return err;
+		}
+
+		cert_tmp = k_malloc(len);
+		if (!cert_tmp) {
+			LOG_ERR("Failed to allocate memory for credential tag: %d",
+				certs[i].sec_tag);
+			return -ENOMEM;
+		}
+
+		err = tls_credential_get(certs[i].sec_tag, certs[i].type, cert_tmp, &len);
+		if (err) {
+			LOG_ERR("Failed to get credential tag: %d", certs[i].sec_tag);
+			k_free(cert_tmp);
+			return err;
+		}
+
+		*certs[i].data = cert_tmp;
+		*certs[i].len = len;
+	}
+
+	return 0;
+}
+
+static void set_enterprise_creds_params(struct wifi_enterprise_creds_params *params,
+					bool is_ap)
+{
+	struct wifi_cert_data certs_common[] = {
+		{
+			.type = TLS_CREDENTIAL_CA_CERTIFICATE,
+			.sec_tag = WIFI_CERT_CA_SEC_TAG,
+			.data = &params->ca_cert,
+			.len = &params->ca_cert_len,
+		},
+	};
+
+	struct wifi_cert_data certs_sta[] = {
+		{
+			.type = TLS_CREDENTIAL_PRIVATE_KEY,
+			.sec_tag = WIFI_CERT_CLIENT_KEY_SEC_TAG,
+			.data = &params->client_key,
+			.len = &params->client_key_len,
+		},
+		{
+			.type = TLS_CREDENTIAL_PUBLIC_CERTIFICATE,
+			.sec_tag = WIFI_CERT_CLIENT_SEC_TAG,
+			.data = &params->client_cert,
+			.len = &params->client_cert_len,
+		},
+		{
+			.type = TLS_CREDENTIAL_CA_CERTIFICATE,
+			.sec_tag = WIFI_CERT_CA_P2_SEC_TAG,
+			.data = &params->ca_cert2,
+			.len = &params->ca_cert2_len,
+		},
+		{
+			.type = TLS_CREDENTIAL_PRIVATE_KEY,
+			.sec_tag = WIFI_CERT_CLIENT_KEY_P2_SEC_TAG,
+			.data = &params->client_key2,
+			.len = &params->client_key2_len,
+		},
+		{
+			.type = TLS_CREDENTIAL_PUBLIC_CERTIFICATE,
+			.sec_tag = WIFI_CERT_CLIENT_P2_SEC_TAG,
+			.data = &params->client_cert2,
+			.len = &params->client_cert2_len,
+		},
+	};
+
+	memset(params, 0, sizeof(*params));
+
+	/* Process common certificates */
+	if (process_certificates(certs_common, ARRAY_SIZE(certs_common)) != 0) {
+		goto cleanup;
+	}
+
+	/* Process STA-specific certificates */
+	if (!is_ap) {
+		if (process_certificates(certs_sta, ARRAY_SIZE(certs_sta)) != 0) {
+			goto cleanup;
+		}
+	}
+
+	memcpy(&enterprise_creds_params, params, sizeof(*params));
+	return;
+
+cleanup:
+	for (size_t i = 0; i < ARRAY_SIZE(certs_common); i++) {
+		if (certs_common[i].data) {
+			k_free(*certs_common[i].data);
+			*certs_common[i].data = NULL;
+		}
+	}
+
+	if (!is_ap) {
+		for (size_t i = 0; i < ARRAY_SIZE(certs_sta); i++) {
+			if (certs_sta[i].data) {
+				k_free(*certs_sta[i].data);
+				*certs_sta[i].data = NULL;
+			}
+		}
+	}
+
+}
+
+static void clear_enterprise_creds_params(struct wifi_enterprise_creds_params *params)
+{
+	if (params == NULL) {
+		return;
+	}
+
+	const uint8_t *certs[] = {
+		params->ca_cert,
+		params->client_cert,
+		params->client_key,
+		params->ca_cert2,
+		params->client_cert2,
+		params->client_key2,
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(certs); i++) {
+		k_free((void *)certs[i]);
+	}
+	memset(params, 0, sizeof(*params));
+}
+#else
+static void set_enterprise_creds_params(struct wifi_enterprise_creds_params *params,
+					 bool is_ap)
+{
+	params->ca_cert = (uint8_t *)ca_cert_test;
+	params->ca_cert_len = ARRAY_SIZE(ca_cert_test);
+
+	if (!is_ap) {
+		params->client_cert = (uint8_t *)client_cert_test;
+		params->client_cert_len = ARRAY_SIZE(client_cert_test);
+		params->client_key = (uint8_t *)client_key_test;
+		params->client_key_len = ARRAY_SIZE(client_key_test);
+		params->ca_cert2 = (uint8_t *)ca_cert2_test;
+		params->ca_cert2_len = ARRAY_SIZE(ca_cert2_test);
+		params->client_cert2 = (uint8_t *)client_cert2_test;
+		params->client_cert2_len = ARRAY_SIZE(client_cert2_test);
+		params->client_key2 = (uint8_t *)client_key2_test;
+		params->client_key2_len = ARRAY_SIZE(client_key2_test);
+
+		return;
+	}
+}
+#endif /* CONFIG_WIFI_CREDENTIALS_RUNTIME_CERTIFICATES */
+
+static int wifi_set_enterprise_creds(const struct shell *sh, struct net_if *iface,
+				     bool is_ap)
 {
 	struct wifi_enterprise_creds_params params = {0};
 
-	params.ca_cert = (uint8_t *)ca_cert_test;
+#ifdef CONFIG_WIFI_SHELL_RUNTIME_CERTIFICATES
-	params.ca_cert_len = ARRAY_SIZE(ca_cert_test);
+	clear_enterprise_creds_params(&enterprise_creds_params);
-	params.client_cert = (uint8_t *)client_cert_test;
+#endif /* CONFIG_WIFI_SHELL_RUNTIME_CERTIFICATES */
-	params.client_cert_len = ARRAY_SIZE(client_cert_test);
+
-	params.client_key = (uint8_t *)client_key_test;
+	set_enterprise_creds_params(&params, is_ap);
-	params.client_key_len = ARRAY_SIZE(client_key_test);
-	params.ca_cert2 = (uint8_t *)ca_cert2_test;
-	params.ca_cert2_len = ARRAY_SIZE(ca_cert2_test);
-	params.client_cert2 = (uint8_t *)client_cert2_test;
-	params.client_cert2_len = ARRAY_SIZE(client_cert2_test);
-	params.client_key2 = (uint8_t *)client_key2_test;
-	params.client_key2_len = ARRAY_SIZE(client_key2_test);
 
 	if (net_mgmt(NET_REQUEST_WIFI_ENTERPRISE_CREDS, iface, &params, sizeof(params))) {
 		shell_warn(sh, "Set enterprise credentials failed\n");
@@ -340,7 +522,7 @@ static int cmd_add_network(const struct shell *sh, size_t argc, char *argv[])
 	}
 
 #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
-	struct net_if *iface = net_if_get_first_by_type(&NET_L2_GET_NAME(ETHERNET));
+	struct net_if *iface = net_if_get_wifi_sta();
 
 	/* Load the enterprise credentials if needed */
 	if (creds.header.type == WIFI_SECURITY_TYPE_EAP_TLS ||
@@ -348,7 +530,7 @@ static int cmd_add_network(const struct shell *sh, size_t argc, char *argv[])
 	    creds.header.type == WIFI_SECURITY_TYPE_EAP_PEAP_GTC ||
 	    creds.header.type == WIFI_SECURITY_TYPE_EAP_TTLS_MSCHAPV2 ||
 	    creds.header.type == WIFI_SECURITY_TYPE_EAP_PEAP_TLS) {
-		cmd_wifi_set_enterprise_creds(sh, iface);
+		wifi_set_enterprise_creds(sh, iface, 0);
 	}
 #endif /* CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE */
 
@@ -368,6 +550,12 @@ static int cmd_delete_network(const struct shell *sh, size_t argc, char *argv[])
 	}
 
 	shell_print(sh, "\tDeleting network ssid: \"%s\", ssid_len: %d", argv[1], strlen(argv[1]));
+
+#ifdef CONFIG_WIFI_SHELL_RUNTIME_CERTIFICATES
+	/* Clear the certificates */
+	clear_enterprise_creds_params(&enterprise_creds_params);
+#endif /* CONFIG_WIFI_SHELL_RUNTIME_CERTIFICATES */
+
 	return wifi_credentials_delete_by_ssid(argv[1], strlen(argv[1]));
 }
 
@@ -381,7 +569,11 @@ static int cmd_list_networks(const struct shell *sh, size_t argc, char *argv[])
 
 static int cmd_auto_connect(const struct shell *sh, size_t argc, char *argv[])
 {
-	struct net_if *iface = net_if_get_first_by_type(&NET_L2_GET_NAME(ETHERNET));
+	struct net_if *iface = net_if_get_wifi_sta();
+
+#ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
+	wifi_set_enterprise_creds(sh, iface, 0);
+#endif /* CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE */
 	int rc = net_mgmt(NET_REQUEST_WIFI_CONNECT_STORED, iface, NULL, 0);
 
 	if (rc) {