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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2021-03-11 01:13:08 +0300
committerMarcel Holtmann <marcel@holtmann.org>2021-03-11 13:45:51 +0300
commit6d19628f539fccf899298ff02ee4c73e4bf6df3f (patch)
tree5567ed750cf53ec71683c21a430e51c448b4956b /net/bluetooth
parentd00745da644d42c2f97293eb3fe19cfd5c0b073c (diff)
downloadlinux-6d19628f539fccf899298ff02ee4c73e4bf6df3f.tar.xz
Bluetooth: SMP: Fail if remote and local public keys are identical
This fails the pairing procedure when both remote and local non-debug public keys are identical. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/smp.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index b0c1ee110eff..e03cc284161c 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -2732,6 +2732,15 @@ static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
if (skb->len < sizeof(*key))
return SMP_INVALID_PARAMS;
+ /* Check if remote and local public keys are the same and debug key is
+ * not in use.
+ */
+ if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) &&
+ !crypto_memneq(key, smp->local_pk, 64)) {
+ bt_dev_err(hdev, "Remote and local public keys are identical");
+ return SMP_UNSPECIFIED;
+ }
+
memcpy(smp->remote_pk, key, 64);
if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {