2024-08-17 12:35:07 -04:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2024-07-17 16:09:08 -04:00
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From: Brian Delwiche <delwiche@google.com>
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Date: Mon, 22 Apr 2024 21:14:56 +0000
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Subject: [PATCH] Fix an authentication bypass bug in SMP
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When pairing with BLE legacy pairing initiated
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from remote, authentication can be bypassed.
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This change fixes it.
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Bug: 251514170
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Test: m com.android.btservices
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Test: manual run against PoC
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Ignore-AOSP-First: security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8a3dbadc71428a30b172a74343be08498c656747)
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Merged-In: I66b1f9a80060f48a604001829db8ea7c96c7b7f8
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Change-Id: I66b1f9a80060f48a604001829db8ea7c96c7b7f8
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---
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stack/smp/smp_act.cc | 12 ++++++++++++
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stack/smp/smp_int.h | 1 +
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2 files changed, 13 insertions(+)
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diff --git a/stack/smp/smp_act.cc b/stack/smp/smp_act.cc
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2024-08-17 12:35:07 -04:00
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index f530218fb..05e0b91a4 100644
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2024-07-17 16:09:08 -04:00
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--- a/stack/smp/smp_act.cc
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+++ b/stack/smp/smp_act.cc
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@@ -281,6 +281,7 @@ void smp_send_pair_rsp(tSMP_CB* p_cb, tSMP_INT_DATA* p_data) {
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void smp_send_confirm(tSMP_CB* p_cb, tSMP_INT_DATA* p_data) {
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SMP_TRACE_DEBUG("%s", __func__);
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smp_send_cmd(SMP_OPCODE_CONFIRM, p_cb);
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+ p_cb->flags |= SMP_PAIR_FLAGS_CMD_CONFIRM_SENT;
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}
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/*******************************************************************************
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@@ -639,6 +640,17 @@ void smp_proc_init(tSMP_CB* p_cb, tSMP_INT_DATA* p_data) {
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return;
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}
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+ if (!((p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT) &&
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+ (p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT)) &&
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+ !(p_cb->flags & SMP_PAIR_FLAGS_CMD_CONFIRM_SENT)) {
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+ // in legacy pairing, the peer should send its rand after
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+ // we send our confirm
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+ tSMP_INT_DATA smp_int_data{};
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+ smp_int_data.status = SMP_INVALID_PARAMETERS;
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+ smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
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+ return;
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+ }
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+
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/* save the SRand for comparison */
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STREAM_TO_ARRAY(p_cb->rrand, p, BT_OCTET16_LEN);
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}
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diff --git a/stack/smp/smp_int.h b/stack/smp/smp_int.h
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2024-08-17 12:35:07 -04:00
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index e0e27a4b2..3ccb4ad6f 100644
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2024-07-17 16:09:08 -04:00
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--- a/stack/smp/smp_int.h
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+++ b/stack/smp/smp_int.h
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@@ -240,6 +240,7 @@ typedef union {
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(1 << 7) /* used to resolve race condition */
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#define SMP_PAIR_FLAG_HAVE_LOCAL_PUBL_KEY \
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(1 << 8) /* used on slave to resolve race condition */
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+#define SMP_PAIR_FLAGS_CMD_CONFIRM_SENT (1 << 9)
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/* check if authentication requirement need MITM protection */
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#define SMP_NO_MITM_REQUIRED(x) (((x)&SMP_AUTH_YN_BIT) == 0)
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