145 lines
5.1 KiB
Diff
145 lines
5.1 KiB
Diff
From b84b23845ec9730b783f4e6efcee70c8b2f09f29 Mon Sep 17 00:00:00 2001
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From: Gopal Tiwari <gtiwari@redhat.com>
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Date: Fri, 24 Apr 2020 16:27:58 +0530
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Subject: [PATCH BlueZ 2/2] HID accepts bonded device connections only.
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commit 3cccdbab2324086588df4ccf5f892fb3ce1f1787
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Author: Alain Michaud <alainm@chromium.org>
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Date: Tue Mar 10 02:35:18 2020 +0000
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HID accepts bonded device connections only.
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This change adds a configuration for platforms to choose a more secure
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posture for the HID profile. While some older mice are known to not
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support pairing or encryption, some platform may choose a more secure
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posture by requiring the device to be bonded and require the
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connection to be encrypted when bonding is required.
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Reference:
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https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00352.html
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---
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profiles/input/device.c | 23 ++++++++++++++++++++++-
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profiles/input/device.h | 1 +
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profiles/input/input.conf | 8 ++++++++
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profiles/input/manager.c | 13 ++++++++++++-
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4 files changed, 43 insertions(+), 2 deletions(-)
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diff --git a/profiles/input/device.c b/profiles/input/device.c
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index 84614784d..3abd2f592 100644
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--- a/profiles/input/device.c
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+++ b/profiles/input/device.c
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@@ -91,6 +91,7 @@ struct input_device {
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static int idle_timeout = 0;
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static bool uhid_enabled = false;
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+static bool classic_bonded_only = false;
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void input_set_idle_timeout(int timeout)
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{
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@@ -102,6 +103,11 @@ void input_enable_userspace_hid(bool state)
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uhid_enabled = state;
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}
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+void input_set_classic_bonded_only(bool state)
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+{
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+ classic_bonded_only = state;
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+}
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+
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static void input_device_enter_reconnect_mode(struct input_device *idev);
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static int connection_disconnect(struct input_device *idev, uint32_t flags);
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@@ -969,8 +975,18 @@ static int hidp_add_connection(struct input_device *idev)
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if (device_name_known(idev->device))
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device_get_name(idev->device, req->name, sizeof(req->name));
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+ /* Make sure the device is bonded if required */
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+ if (classic_bonded_only && !device_is_bonded(idev->device,
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+ btd_device_get_bdaddr_type(idev->device))) {
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+ error("Rejected connection from !bonded device %s", dst_addr);
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+ goto cleanup;
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+ }
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+
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/* Encryption is mandatory for keyboards */
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- if (req->subclass & 0x40) {
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+ /* Some platforms may choose to require encryption for all devices */
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+ /* Note that this only matters for pre 2.1 devices as otherwise the */
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+ /* device is encrypted by default by the lower layers */
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+ if (classic_bonded_only || req->subclass & 0x40) {
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if (!bt_io_set(idev->intr_io, &gerr,
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BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_MEDIUM,
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BT_IO_OPT_INVALID)) {
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@@ -1202,6 +1218,11 @@ static void input_device_enter_reconnect_mode(struct input_device *idev)
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DBG("path=%s reconnect_mode=%s", idev->path,
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reconnect_mode_to_string(idev->reconnect_mode));
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+ /* Make sure the device is bonded if required */
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+ if (classic_bonded_only && !device_is_bonded(idev->device,
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+ btd_device_get_bdaddr_type(idev->device)))
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+ return;
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+
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/* Only attempt an auto-reconnect when the device is required to
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* accept reconnections from the host.
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*/
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diff --git a/profiles/input/device.h b/profiles/input/device.h
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index 51a9aee18..3044db673 100644
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--- a/profiles/input/device.h
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+++ b/profiles/input/device.h
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@@ -29,6 +29,7 @@ struct input_conn;
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void input_set_idle_timeout(int timeout);
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void input_enable_userspace_hid(bool state);
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+void input_set_classic_bonded_only(bool state);
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int input_device_register(struct btd_service *service);
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void input_device_unregister(struct btd_service *service);
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diff --git a/profiles/input/input.conf b/profiles/input/input.conf
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index 3e1d65aae..166aff4a4 100644
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--- a/profiles/input/input.conf
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+++ b/profiles/input/input.conf
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@@ -11,3 +11,11 @@
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# Enable HID protocol handling in userspace input profile
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# Defaults to false (HIDP handled in HIDP kernel module)
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#UserspaceHID=true
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+
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+# Limit HID connections to bonded devices
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+# The HID Profile does not specify that devices must be bonded, however some
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+# platforms may want to make sure that input connections only come from bonded
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+# device connections. Several older mice have been known for not supporting
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+# pairing/encryption.
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+# Defaults to false to maximize device compatibility.
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+#ClassicBondedOnly=true
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diff --git a/profiles/input/manager.c b/profiles/input/manager.c
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index 1d31b0652..5cd27b839 100644
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--- a/profiles/input/manager.c
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+++ b/profiles/input/manager.c
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@@ -96,7 +96,7 @@ static int input_init(void)
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config = load_config_file(CONFIGDIR "/input.conf");
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if (config) {
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int idle_timeout;
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- gboolean uhid_enabled;
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+ gboolean uhid_enabled, classic_bonded_only;
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idle_timeout = g_key_file_get_integer(config, "General",
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"IdleTimeout", &err);
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@@ -114,6 +114,17 @@ static int input_init(void)
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input_enable_userspace_hid(uhid_enabled);
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} else
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g_clear_error(&err);
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+
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+ classic_bonded_only = g_key_file_get_boolean(config, "General",
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+ "ClassicBondedOnly", &err);
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+
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+ if (!err) {
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+ DBG("input.conf: ClassicBondedOnly=%s",
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+ classic_bonded_only ? "true" : "false");
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+ input_set_classic_bonded_only(classic_bonded_only);
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+ } else
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+ g_clear_error(&err);
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+
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}
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btd_profile_register(&input_profile);
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--
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2.21.1
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