Return-Path: From: Lukasz Rymanowski To: linux-bluetooth@vger.kernel.org Cc: szymon.janc@tieto.com, johan.hedberg@gmail.com, Lukasz Rymanowski Subject: [PATCH v2 09/12] android/bluetooth: Store sign counter needed for aes-cmac sign Date: Thu, 22 May 2014 10:07:39 +0200 Message-Id: <1400746062-24766-10-git-send-email-lukasz.rymanowski@tieto.com> In-Reply-To: <1400746062-24766-1-git-send-email-lukasz.rymanowski@tieto.com> References: <1400746062-24766-1-git-send-email-lukasz.rymanowski@tieto.com> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: If CSRK is valid between sessions we should remember sign counter. Therefor store it. --- android/bluetooth.c | 41 +++++++++++++++++++++++++++++++++++++++-- 1 file changed, 39 insertions(+), 2 deletions(-) diff --git a/android/bluetooth.c b/android/bluetooth.c index 83aae9f..082441f 100644 --- a/android/bluetooth.c +++ b/android/bluetooth.c @@ -1877,8 +1877,6 @@ static void new_csrk_callback(uint16_t index, uint16_t length, if (ev->store_hint) store_csrk(dev); - - /*TODO: Store sign counter */ } static void register_mgmt_handlers(void) @@ -2352,6 +2350,9 @@ static struct device *create_device_from_info(GKeyFile *key_file, sscanf(str + (i * 2), "%02hhX", &dev->local_csrk[i]); g_free(str); + + dev->local_sign_cnt = g_key_file_get_integer(key_file, peer, + "LocalCSRKSignCounter", NULL); } str = g_key_file_get_string(key_file, peer, "RemoteCSRK", NULL); @@ -2363,6 +2364,9 @@ static struct device *create_device_from_info(GKeyFile *key_file, sscanf(str + (i * 2), "%02hhX", &dev->remote_csrk[i]); g_free(str); + + dev->remote_sign_cnt = g_key_file_get_integer(key_file, peer, + "RemoteCSRKSignCounter", NULL); } str = g_key_file_get_string(key_file, peer, "Name", NULL); @@ -3333,6 +3337,37 @@ bool bt_get_csrk(const bdaddr_t *addr, enum bt_csrk_type type, uint8_t key[16], return true; } +static void store_sign_counter(struct device *dev, enum bt_csrk_type type) +{ + const char *sign_cnt_s; + uint32_t sign_cnt; + GKeyFile *key_file; + bool local = (type == LOCAL_CSRK); + + gsize length = 0; + char addr[18]; + char *data; + + key_file = g_key_file_new(); + if (!g_key_file_load_from_file(key_file, DEVICES_FILE, 0, NULL)) { + g_key_file_free(key_file); + return; + } + + ba2str(&dev->bdaddr, addr); + + sign_cnt_s = local ? "LocalCSRKSignCounter" : "RemoteCSRKSignCounter"; + sign_cnt = local ? dev->local_sign_cnt : dev->remote_sign_cnt; + + g_key_file_set_integer(key_file, addr, sign_cnt_s, sign_cnt); + + data = g_key_file_to_data(key_file, &length, NULL); + g_file_set_contents(DEVICES_FILE, data, length, NULL); + g_free(data); + + g_key_file_free(key_file); +} + void bt_update_sign_counter(const bdaddr_t *addr, enum bt_csrk_type type) { struct device *dev; @@ -3345,6 +3380,8 @@ void bt_update_sign_counter(const bdaddr_t *addr, enum bt_csrk_type type) dev->local_sign_cnt++; else dev->remote_sign_cnt++; + + store_sign_counter(dev, type); } static uint8_t set_adapter_scan_mode(const void *buf, uint16_t len) -- 1.8.4