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100 lines
4.1 KiB
Diff
100 lines
4.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hui Peng <phui@google.com>
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Date: Sat, 2 Sep 2023 04:20:10 +0000
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Subject: [PATCH] Reject access to secure service authenticated from a temp
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bonding [1]
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Rejecct access to services running on l2cap
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Backport of
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Idef4ea28eb3d17b0807ab7dc6849433ddc5581b3
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Bug: 294854926
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Test: m com.android.btservices
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Ignore-AOSP-First: security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a36757e967ab6d956127cac298134f28ce8f0d6d)
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Merged-In: Idef4ea28eb3d17b0807ab7dc6849433ddc5581b3
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Change-Id: Idef4ea28eb3d17b0807ab7dc6849433ddc5581b3
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---
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stack/btm/btm_sec.cc | 38 ++++++++++++++++++++++++++++++++++----
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1 file changed, 34 insertions(+), 4 deletions(-)
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diff --git a/stack/btm/btm_sec.cc b/stack/btm/btm_sec.cc
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index 9be18a42b..c0cade2f2 100644
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--- a/stack/btm/btm_sec.cc
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+++ b/stack/btm/btm_sec.cc
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@@ -100,7 +100,7 @@ static bool btm_sec_set_security_level(CONNECTION_TYPE conn_type,
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uint32_t mx_proto_id,
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uint32_t mx_chan_id);
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-static bool btm_dev_authenticated(tBTM_SEC_DEV_REC* p_dev_rec);
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+static bool btm_dev_authenticated(const tBTM_SEC_DEV_REC* p_dev_rec);
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static bool btm_dev_encrypted(tBTM_SEC_DEV_REC* p_dev_rec);
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static bool btm_dev_authorized(tBTM_SEC_DEV_REC* p_dev_rec);
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static bool btm_serv_trusted(tBTM_SEC_DEV_REC* p_dev_rec,
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@@ -142,7 +142,7 @@ static const bool btm_sec_io_map[BTM_IO_CAP_MAX][BTM_IO_CAP_MAX] = {
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* Returns bool true or false
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*
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******************************************************************************/
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-static bool btm_dev_authenticated(tBTM_SEC_DEV_REC* p_dev_rec) {
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+static bool btm_dev_authenticated(const tBTM_SEC_DEV_REC* p_dev_rec) {
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if (p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED) {
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return (true);
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}
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@@ -216,6 +216,25 @@ static bool btm_serv_trusted(tBTM_SEC_DEV_REC* p_dev_rec,
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return (false);
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}
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+/*******************************************************************************
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+ *
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+ * Function access_secure_service_from_temp_bond
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+ *
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+ * Description a utility function to test whether an access to
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+ * secure service from temp bonding is happening
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+ *
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+ * Returns true if the aforementioned condition holds,
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+ * false otherwise
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+ *
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+ ******************************************************************************/
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+static bool access_secure_service_from_temp_bond(const tBTM_SEC_DEV_REC* p_dev_rec,
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+ bool locally_initiated,
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+ uint16_t security_req) {
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+ return !locally_initiated && (security_req & BTM_SEC_IN_AUTHENTICATE) &&
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+ btm_dev_authenticated(p_dev_rec) &&
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+ p_dev_rec->bond_type == BOND_TYPE_TEMPORARY;
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+}
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+
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/*******************************************************************************
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*
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* Function BTM_SecRegister
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@@ -2212,9 +2231,13 @@ tBTM_STATUS btm_sec_l2cap_access_req(const RawAddress& bd_addr, uint16_t psm,
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}
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if (rc == BTM_SUCCESS) {
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+ if (access_secure_service_from_temp_bond(p_dev_rec, is_originator, security_required)) {
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+ LOG_ERROR(LOG_TAG, "Trying to access a secure service from a temp bonding, rejecting");
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+ rc = BTM_FAILED_ON_SECURITY;
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+ }
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if (p_callback)
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- (*p_callback)(&bd_addr, transport, (void*)p_ref_data, BTM_SUCCESS);
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- return (BTM_SUCCESS);
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+ (*p_callback)(&bd_addr, transport, (void*)p_ref_data, rc);
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+ return (rc);
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}
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}
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@@ -5271,6 +5294,13 @@ static tBTM_STATUS btm_sec_execute_procedure(tBTM_SEC_DEV_REC* p_dev_rec) {
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}
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}
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+ if (access_secure_service_from_temp_bond(p_dev_rec,
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+ p_dev_rec->is_originator,
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+ p_dev_rec->security_required)) {
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+ LOG_ERROR(LOG_TAG, "Trying to access a secure service from a temp bonding, rejecting");
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+ return (BTM_FAILED_ON_SECURITY);
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+ }
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+
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/* All required security procedures already established */
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p_dev_rec->security_required &=
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~(BTM_SEC_OUT_AUTHORIZE | BTM_SEC_IN_AUTHORIZE |
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