469 lines
15 KiB
C
469 lines
15 KiB
C
/*
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* Copyright (c) 2015, Yanzi Networks AB.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup oma-lwm2m
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* @{
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*
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*/
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/**
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* \file
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* Implementation of the Contiki OMA LWM2M security
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* \author
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* Joakim Eriksson <joakime@sics.se>
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* Niclas Finne <nfi@sics.se>
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*/
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#include <stdint.h>
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#include <string.h>
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#include "lwm2m-object.h"
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#include "lwm2m-engine.h"
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#include "lwm2m-server.h"
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#include "lwm2m-security.h"
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#include "coap-keystore.h"
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#include "lib/list.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINTS(l,s,f) do { int i; \
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for(i = 0; i < l; i++) printf(f, s[i]); \
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} while(0)
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#define PRINTPRE(p,l,s) do { PRINTF(p);PRINTS(l,s,"%c"); } while(0);
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#define PRINTEP(ep) coap_endpoint_print(ep)
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#else
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#define PRINTF(...)
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#define PRINTS(l,s,f)
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#define PRINTPRE(p,l,s);
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#define PRINTEP(ep)
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#endif
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#ifdef LWM2M_SECURITY_CONF_REGISTER_KEY_STORE
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#define LWM2M_SECURITY_REGISTER_KEY_STORE LWM2M_SECURITY_CONF_REGISTER_KEY_STORE
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#else /* LWM2M_SECURITY_CONF_REGISTER_KEY_STORE */
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#define LWM2M_SECURITY_REGISTER_KEY_STORE 1
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#endif /* LWM2M_SECURITY_CONF_REGISTER_KEY_STORE */
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#define MAX_COUNT LWM2M_SERVER_MAX_COUNT
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static lwm2m_status_t lwm2m_callback(lwm2m_object_instance_t *object,
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lwm2m_context_t *ctx);
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static lwm2m_object_instance_t *get_by_id(uint16_t instance_id,
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lwm2m_status_t *status);
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static const lwm2m_resource_id_t resources[] = {
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LWM2M_SECURITY_SERVER_URI_ID, LWM2M_SECURITY_BOOTSTRAP_SERVER_ID,
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LWM2M_SECURITY_MODE_ID, LWM2M_SECURITY_CLIENT_PKI_ID,
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LWM2M_SECURITY_SERVER_PKI_ID, LWM2M_SECURITY_KEY_ID,
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LWM2M_SECURITY_SHORT_SERVER_ID
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};
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LIST(instances_list);
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static lwm2m_security_server_t instances[MAX_COUNT];
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/*---------------------------------------------------------------------------*/
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static lwm2m_object_instance_t *
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create_instance(uint16_t instance_id, lwm2m_status_t *status)
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{
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lwm2m_object_instance_t *instance;
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int i;
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instance = get_by_id(instance_id, NULL);
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if(instance != NULL) {
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/* An instance with this id is already registered */
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if(status) {
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*status = LWM2M_STATUS_OPERATION_NOT_ALLOWED;
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}
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return NULL;
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}
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for(i = 0; i < MAX_COUNT; i++) {
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if(instances[i].instance.instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
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memset(&instances[i], 0, sizeof(instances[i]));
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instances[i].instance.callback = lwm2m_callback;
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instances[i].instance.object_id = LWM2M_OBJECT_SECURITY_ID;
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instances[i].instance.instance_id = instance_id;
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instances[i].instance.resource_ids = resources;
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instances[i].instance.resource_count =
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sizeof(resources) / sizeof(lwm2m_resource_id_t);
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list_add(instances_list, &instances[i].instance);
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PRINTF("SEC: Create new security instance\n");
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return &instances[i].instance;
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}
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}
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if(status) {
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*status = LWM2M_STATUS_SERVICE_UNAVAILABLE;
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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static int
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delete_instance(uint16_t instance_id, lwm2m_status_t *status)
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{
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lwm2m_object_instance_t *instance;
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if(instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
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/* Remove all instances */
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while((instance = list_pop(instances_list)) != NULL) {
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instance->instance_id = LWM2M_OBJECT_INSTANCE_NONE;
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}
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return 1;
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}
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instance = get_by_id(instance_id, NULL);
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if(instance != NULL) {
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instance->instance_id = LWM2M_OBJECT_INSTANCE_NONE;
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list_remove(instances_list, instance);
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static lwm2m_object_instance_t *
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get_first(lwm2m_status_t *status)
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{
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return list_head(instances_list);
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}
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/*---------------------------------------------------------------------------*/
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static lwm2m_object_instance_t *
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get_next(lwm2m_object_instance_t *instance, lwm2m_status_t *status)
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{
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return instance == NULL ? NULL : instance->next;
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}
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/*---------------------------------------------------------------------------*/
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static lwm2m_object_instance_t *
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get_by_id(uint16_t instance_id, lwm2m_status_t *status)
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{
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lwm2m_object_instance_t *instance;
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for(instance = list_head(instances_list);
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instance != NULL;
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instance = instance->next) {
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if(instance->instance_id == instance_id) {
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return instance;
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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static lwm2m_status_t
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lwm2m_callback(lwm2m_object_instance_t *object,
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lwm2m_context_t *ctx)
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{
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/* NOTE: the create operation will only create an instance and should
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avoid reading out data */
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int32_t value;
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int iv;
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lwm2m_security_server_t *security;
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security = (lwm2m_security_server_t *) object;
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if(ctx->operation == LWM2M_OP_WRITE) {
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/* Handle the writes */
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switch(ctx->resource_id) {
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case LWM2M_SECURITY_SERVER_URI_ID:
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PRINTF("Writing security URI value: len: %d\n", (int)ctx->inbuf->size);
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value = lwm2m_object_read_string(ctx, ctx->inbuf->buffer, ctx->inbuf->size, security->server_uri, URI_SIZE);
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/* This is string... */
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security->server_uri_len = ctx->last_value_len;
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break;
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case LWM2M_SECURITY_BOOTSTRAP_SERVER_ID:
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value = lwm2m_object_read_boolean(ctx, ctx->inbuf->buffer, ctx->inbuf->size, &iv);
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if(value > 0) {
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PRINTF("Set Bootstrap: %d\n", iv);
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security->bootstrap = (uint8_t) iv;
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} else {
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PRINTF("Failed to set bootstrap\n");
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}
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break;
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case LWM2M_SECURITY_MODE_ID:
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{
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int32_t v2;
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value = lwm2m_object_read_int(ctx, ctx->inbuf->buffer, ctx->inbuf->size, &v2);
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PRINTF("Writing security MODE value: %d len: %d\n", v2,
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(int)ctx->inbuf->size);
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security->security_mode = v2;
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}
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break;
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case LWM2M_SECURITY_CLIENT_PKI_ID:
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value = lwm2m_object_read_string(ctx, ctx->inbuf->buffer, ctx->inbuf->size, security->public_key, KEY_SIZE);
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security->public_key_len = ctx->last_value_len;
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PRINTF("Writing client PKI: len: %d '", (int)ctx->last_value_len);
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PRINTS(ctx->last_value_len, security->public_key, "%c");
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PRINTF("'\n");
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break;
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case LWM2M_SECURITY_KEY_ID:
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value = lwm2m_object_read_string(ctx, ctx->inbuf->buffer, ctx->inbuf->size, security->secret_key, URI_SIZE);
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security->secret_key_len = ctx->last_value_len;
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PRINTF("Writing secret key: len: %d '", (int)ctx->last_value_len);
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PRINTS(ctx->last_value_len, security->secret_key, "%c");
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PRINTF("'\n");
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break;
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}
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} else if(ctx->operation == LWM2M_OP_READ) {
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switch(ctx->resource_id) {
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case LWM2M_SECURITY_SERVER_URI_ID:
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lwm2m_object_write_string(ctx, (const char *) security->server_uri,
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security->server_uri_len);
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break;
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default:
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return LWM2M_STATUS_ERROR;
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}
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}
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return LWM2M_STATUS_OK;
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}
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/*---------------------------------------------------------------------------*/
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lwm2m_security_server_t *
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lwm2m_security_get_first(void)
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{
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return list_head(instances_list);
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}
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/*---------------------------------------------------------------------------*/
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lwm2m_security_server_t *
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lwm2m_security_get_next(lwm2m_security_server_t *last)
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{
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return last == NULL ? NULL : (lwm2m_security_server_t *)last->instance.next;
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}
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/*---------------------------------------------------------------------------*/
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lwm2m_security_server_t *
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lwm2m_security_add_server(uint16_t instance_id,
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uint16_t server_id,
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const uint8_t *server_uri,
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uint8_t server_uri_len)
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{
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lwm2m_security_server_t *server;
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int i;
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if(server_uri_len > URI_SIZE) {
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PRINTF("lwm2m-sec: too long server URI\n");
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return NULL;
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}
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for(server = lwm2m_security_get_first();
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server != NULL;
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server = lwm2m_security_get_next(server)) {
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if(server->server_id == server_id) {
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if(server->instance.instance_id != instance_id) {
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PRINTF("lwm2m-sec: wrong instance id\n");
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return NULL;
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}
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/* Correct server id and instance id */
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break;
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} else if(server->instance.instance_id == instance_id) {
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PRINTF("lwm2m-sec: wrong server id\n");
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return NULL;
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}
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}
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if(server == NULL) {
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for(i = 0; i < MAX_COUNT; i++) {
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if(instances[i].instance.instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
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memset(&instances[i], 0, sizeof(instances[i]));
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instances[i].instance.callback = lwm2m_callback;
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instances[i].instance.object_id = LWM2M_OBJECT_SECURITY_ID;
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instances[i].instance.instance_id = instance_id;
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instances[i].instance.resource_ids = resources;
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instances[i].instance.resource_count =
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sizeof(resources) / sizeof(lwm2m_resource_id_t);
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list_add(instances_list, &instances[i].instance);
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server = &instances[i];
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}
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}
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if(server == NULL) {
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PRINTF("lwm2m-sec: no space for more servers\n");
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return NULL;
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}
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}
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memcpy(server->server_uri, server_uri, server_uri_len);
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server->server_uri_len = server_uri_len;
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return server;
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}
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/*---------------------------------------------------------------------------*/
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int
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lwm2m_security_set_server_psk(lwm2m_security_server_t *server,
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const uint8_t *identity,
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uint8_t identity_len,
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const uint8_t *key,
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uint8_t key_len)
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{
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if(server == NULL || identity == NULL || key == NULL) {
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return 0;
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}
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if(identity_len > KEY_SIZE) {
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PRINTF("lwm2m-sec: too large identity\n");
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return 0;
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}
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if(key_len > KEY_SIZE) {
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PRINTF("lwm2m-sec: too large identity\n");
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return 0;
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}
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memcpy(server->public_key, identity, identity_len);
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server->public_key_len = identity_len;
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memcpy(server->secret_key, key, key_len);
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server->secret_key_len = key_len;
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server->security_mode = LWM2M_SECURITY_MODE_PSK;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static const lwm2m_object_impl_t impl = {
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.object_id = LWM2M_OBJECT_SECURITY_ID,
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.get_first = get_first,
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.get_next = get_next,
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.get_by_id = get_by_id,
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.create_instance = create_instance,
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.delete_instance = delete_instance,
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};
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static lwm2m_object_t reg_object = {
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.impl = &impl,
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};
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/*---------------------------------------------------------------------------*/
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#ifdef WITH_DTLS
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#if LWM2M_SECURITY_REGISTER_KEY_STORE
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static int
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get_psk_info(const coap_endpoint_t *address_info,
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coap_keystore_psk_entry_t *info)
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{
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/* Find matching security object based on address */
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lwm2m_security_server_t *e;
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coap_endpoint_t ep;
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if(info == NULL || address_info == NULL) {
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return 0;
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}
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for(e = lwm2m_security_get_first();
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e != NULL;
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e = lwm2m_security_get_next(e)) {
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if(e->server_uri_len == 0) {
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continue;
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}
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if(e->security_mode != LWM2M_SECURITY_MODE_PSK) {
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/* Only PSK supported for now */
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continue;
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}
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if(!coap_endpoint_parse((char *)e->server_uri, e->server_uri_len, &ep)) {
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/* Failed to parse URI to endpoint */
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PRINTF("lwm2m-sec: failed to parse server URI ");
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PRINTS(e->server_uri_len, e->server_uri, "%c");
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PRINTF("\n");
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continue;
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}
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if(!coap_endpoint_cmp(address_info, &ep)) {
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/* Wrong server */
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PRINTF("lwm2m-sec: wrong server ");
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PRINTEP(address_info);
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PRINTF(" != ");
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PRINTEP(&ep);
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PRINTF("\n");
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continue;
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}
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if(info->identity_len > 0 && info->identity != NULL) {
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/* Searching for a specific identity */
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if(info->identity_len != e->public_key_len ||
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memcmp(info->identity, e->public_key, info->identity_len)) {
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/* Identity not matching */
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PRINTF("lwm2m-sec: identity not matching\n");
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continue;
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}
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}
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/* Found security information for this server */
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PRINTF("lwm2m-sec: found security match!\n");
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break;
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}
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if(e == NULL) {
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/* No matching security object found */
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return 0;
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}
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if(info->identity == NULL || info->identity_len == 0) {
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/* Identity requested */
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info->identity = e->public_key;
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info->identity_len = e->public_key_len;
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return 1;
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}
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if(e->secret_key_len == 0) {
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/* No secret key / password */
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return 0;
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}
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info->key = e->secret_key;
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info->key_len = e->secret_key_len;
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return 1;
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}
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#endif /* LWM2M_SECURITY_REGISTER_KEY_STORE */
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#endif /* WITH_DTLS */
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/*---------------------------------------------------------------------------*/
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#ifdef WITH_DTLS
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#if LWM2M_SECURITY_REGISTER_KEY_STORE
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static const coap_keystore_t key_store = {
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.coap_get_psk_info = get_psk_info
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};
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#endif /* LWM2M_SECURITY_REGISTER_KEY_STORE */
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#endif /* WITH_DTLS */
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/*---------------------------------------------------------------------------*/
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void
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lwm2m_security_init(void)
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{
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int i;
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PRINTF("*** Init lwm2m-security\n");
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list_init(instances_list);
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for(i = 0; i < MAX_COUNT; i++) {
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instances[i].instance.instance_id = LWM2M_OBJECT_INSTANCE_NONE;
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}
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if(lwm2m_engine_add_generic_object(®_object)) {
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#ifdef WITH_DTLS
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#if LWM2M_SECURITY_REGISTER_KEY_STORE
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/* Security object handler added - register keystore */
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coap_set_keystore(&key_store);
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#endif /* LWM2M_SECURITY_REGISTER_KEY_STORE */
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#endif /* WITH_DTLS */
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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