Diff: GaragemService.h

Revision:

9:329af8cdc923

Child:

10:80850cd6c29e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/GaragemService.h	Tue Aug 25 22:18:21 2015 +0000
@@ -0,0 +1,86 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __BLE_GARAGEM_SERVICE_H__
+#define __BLE_GARAGEM_SERVICE_H__
+#include "History.h"
+
+#define SHARED_SECRET   "ABRE-TE"
+
+#define GARAGEM_OK                          0
+#define GARAGEM_ERROR_REPETITION_ATTACK     1
+#define GARAGEM_ERROR_WRONG_SHARED_SECRET   2
+
+
+class GaragemService {
+public:
+    const static uint16_t GARAGEM_SERVICE_UUID              = 0x2000;
+    const static uint16_t GARAGEM_CHALLENGE_CHARACTERISTIC_UUID = 0x2001;
+    const static uint16_t GARAGEM_LAST_OPEN_TS_UUID = 0x2002;
+    const static uint16_t GARAGEM_LAST_OPEN_ID_UUID = 0x2003;
+
+    GaragemService(BLE &_ble) :
+        ble(_ble), 
+        GaragemChallenge(GARAGEM_CHALLENGE_CHARACTERISTIC_UUID, (uint8_t *)"INIT"),
+        GaragemLastOpenTS(GARAGEM_LAST_OPEN_TS_UUID, 0),
+        GaragemLastOpenID(GARAGEM_LAST_OPEN_ID_UUID, (uint8_t *)"INIT")
+    {
+        GattCharacteristic *charTable[] = {&GaragemChallenge, &GaragemLastOpenTS, &GaragemLastOpenID};
+        GattService         GaragemService(GARAGEM_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.gattServer().addService(GaragemService);
+    }
+
+    GattAttribute::Handle_t getChallengeHandle() const {
+        return GaragemChallenge.getValueHandle();
+    }
+    
+    int checkMessage(uint8_t *msg) {
+        DBG("WHAT ? %s\r\n", (char *) msg);
+
+        uint64_t token;
+        char syskey[8];
+        memcpy(&token, msg, 8);
+        memcpy(&syskey, &msg[8], 8);
+        DBG("TS=%lu\tID=%c%c%c%c\tSYSKEY=%s\r\n", *((uint32_t *) msg), msg[4], msg[5], msg[6], msg[7], &msg[8]); 
+
+        //check we are not a victim of a repetion attack
+        if(history.last_ts() >= (uint32_t) msg[0]) {
+            DBG("HA HA repetion here...\r\n");
+            return GARAGEM_ERROR_REPETITION_ATTACK;
+        }
+        
+        if (strncmp(syskey,SHARED_SECRET,7)==0) {//TODO MOVE TO 8 CHARS
+            //Save our success
+            history.save(token);
+            ble.gattServer().write(GaragemLastOpenTS.getValueHandle(), (const uint8_t *)&msg[0], 4*sizeof(uint8_t));
+            ble.gattServer().write(GaragemLastOpenID.getValueHandle(), (const uint8_t *)&msg[4], 4*sizeof(uint8_t));
+        
+            return GARAGEM_OK;
+        } else {
+            return GARAGEM_ERROR_WRONG_SHARED_SECRET;
+        }
+    }
+    
+private:
+    BLE   &ble;
+    WriteOnlyArrayGattCharacteristic<uint8_t, 16>  GaragemChallenge;
+    ReadOnlyGattCharacteristic<uint32_t> GaragemLastOpenTS;
+    ReadOnlyArrayGattCharacteristic<uint8_t, 4> GaragemLastOpenID;
+    
+    History<16> history;
+};
+
+#endif /* #ifndef __BLE_GARAGEM_SERVICE_H__ */