libcli:smb2: Use constant time memcmp() to verify the signature

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c
index b72355429ef27f56676084d66e34822d5024a84a..90d80cc9ba06811334e1c2cbe96f83364992dc88 100644 (file)
--- a/libcli/smb/smb2_signing.c
+++ b/libcli/smb/smb2_signing.c
@@ -167,7 +167,7 @@ NTSTATUS smb2_signing_check_pdu(DATA_BLOB signing_key,
                memcpy(res, digest, 16);
        }
 
-       if (memcmp(res, sig, 16) != 0) {
+       if (memcmp_const_time(res, sig, 16) != 0) {
                DEBUG(0,("Bad SMB2 signature for message\n"));
                dump_data(0, sig, 16);
                dump_data(0, res, 16);