DivestOS/Patches/LineageOS-15.1/android_system_bt/377020-backport.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Hui Peng <phui@google.com>
Date: Tue, 12 Sep 2023 23:54:08 +0000
Subject: [PATCH] Reorganize the code for checking auth requirement
Original bug
Bug: 294854926
regressions:
Bug: 299570702
Test: Test: m com.android.btservices
Test: QA validation
Ignore-AOSP-First: security
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0c488b2420befe0f8038957861072a8e63702f91)
Merged-In: I976a5a6d7bb819fd6accdc71eb1501b9606f3ae4
Change-Id: I976a5a6d7bb819fd6accdc71eb1501b9606f3ae4
---
stack/btm/btm_sec.cc | 99 ++++++++++++++++++++++++++------------------
1 file changed, 59 insertions(+), 40 deletions(-)
diff --git a/stack/btm/btm_sec.cc b/stack/btm/btm_sec.cc
index fb00cb230..005629c48 100644
--- a/stack/btm/btm_sec.cc
+++ b/stack/btm/btm_sec.cc
@@ -5202,52 +5202,71 @@ static tBTM_STATUS btm_sec_execute_procedure(tBTM_SEC_DEV_REC* p_dev_rec) {
/* If connection is not authenticated and authentication is required */
/* start authentication and return PENDING to the caller */
- if ((((!(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) &&
- ((p_dev_rec->is_originator &&
- (p_dev_rec->security_required & BTM_SEC_OUT_AUTHENTICATE)) ||
- (!p_dev_rec->is_originator &&
- (p_dev_rec->security_required & BTM_SEC_IN_AUTHENTICATE)))) ||
- (!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) &&
- (!p_dev_rec->is_originator &&
- (p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN)))) &&
- (p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE)) {
-/*
- * We rely on BTM_SEC_16_DIGIT_PIN_AUTHED being set if MITM is in use,
- * as 16 DIGIT is only needed if MITM is not used. Unfortunately, the
- * BTM_SEC_AUTHENTICATED is used for both MITM and non-MITM
- * authenticated connections, hence we cannot distinguish here.
- */
+ if (p_dev_rec->hci_handle != HCI_INVALID_HANDLE) {
+ bool start_auth = false;
+
+ // Check link status of BR/EDR
+ if (!(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) {
+ if (p_dev_rec->is_originator) {
+ if (p_dev_rec->security_required & BTM_SEC_OUT_AUTHENTICATE) {
+ LOG_DEBUG(LOG_TAG, "Outgoing authentication Required");
+ start_auth = true;
+ }
+ } else {
+ if (p_dev_rec->security_required & BTM_SEC_IN_AUTHENTICATE) {
+ LOG_DEBUG(LOG_TAG, "Incoming authentication Required");
+ start_auth = true;
+ }
+ }
+ }
+
+ if (!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED)) {
+ /*
+ * We rely on BTM_SEC_16_DIGIT_PIN_AUTHED being set if MITM is in use,
+ * as 16 DIGIT is only needed if MITM is not used. Unfortunately, the
+ * BTM_SEC_AUTHENTICATED is used for both MITM and non-MITM
+ * authenticated connections, hence we cannot distinguish here.
+ */
+ if (!p_dev_rec->is_originator) {
+ if (p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN) {
+ LOG_DEBUG(LOG_TAG, "BTM_SEC_IN_MIN_16_DIGIT_PIN Required");
+ start_auth = true;
+ }
+ }
+ }
+ if (start_auth) {
#if (L2CAP_UCD_INCLUDED == TRUE)
- /* if incoming UCD packet, discard it */
- if (!p_dev_rec->is_originator && (p_dev_rec->is_ucd == true))
- return (BTM_FAILED_ON_SECURITY);
+ /* if incoming UCD packet, discard it */
+ if (!p_dev_rec->is_originator && (p_dev_rec->is_ucd == true))
+ return (BTM_FAILED_ON_SECURITY);
#endif
- BTM_TRACE_EVENT("Security Manager: Start authentication");
+ LOG_DEBUG(LOG_TAG, "Security Manager: Start authentication");
- /*
- * If we do have a link-key, but we end up here because we need an
- * upgrade, then clear the link-key known and authenticated flag before
- * restarting authentication.
- * WARNING: If the controller has link-key, it is optional and
- * recommended for the controller to send a Link_Key_Request.
- * In case we need an upgrade, the only alternative would be to delete
- * the existing link-key. That could lead to very bad user experience
- * or even IOP issues, if a reconnect causes a new connection that
- * requires an upgrade.
- */
- if ((p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) &&
- (!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) &&
- (!p_dev_rec->is_originator &&
- (p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN)))) {
- p_dev_rec->sec_flags &=
- ~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED |
- BTM_SEC_AUTHENTICATED);
- }
+ /*
+ * If we do have a link-key, but we end up here because we need an
+ * upgrade, then clear the link-key known and authenticated flag before
+ * restarting authentication.
+ * WARNING: If the controller has link-key, it is optional and
+ * recommended for the controller to send a Link_Key_Request.
+ * In case we need an upgrade, the only alternative would be to delete
+ * the existing link-key. That could lead to very bad user experience
+ * or even IOP issues, if a reconnect causes a new connection that
+ * requires an upgrade.
+ */
+ if ((p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) &&
+ (!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) &&
+ (!p_dev_rec->is_originator &&
+ (p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN)))) {
+ p_dev_rec->sec_flags &=
+ ~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED |
+ BTM_SEC_AUTHENTICATED);
+ }
- btm_sec_start_authentication(p_dev_rec);
- return (BTM_CMD_STARTED);
+ btm_sec_start_authentication(p_dev_rec);
+ return (BTM_CMD_STARTED);
+ }
}
/* If connection is not encrypted and encryption is required */