libcli:smb: Use GnuTLS AES128 CMAC in smb2_signing_check_pdu()

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c
index 466fe9a49e36413257603998ad13eee0756e4308..5bf61bd477b18665087d78a2f96fee4df5a64262 100644 (file)
--- a/libcli/smb/smb2_signing.c
+++ b/libcli/smb/smb2_signing.c
@@ -216,6 +216,43 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
        sig = hdr+SMB2_HDR_SIGNATURE;
 
        if (protocol >= PROTOCOL_SMB2_24) {
+#ifdef HAVE_GNUTLS_AES_CMAC
+               gnutls_datum_t key = {
+                       .data = signing_key->blob.data,
+                       .size = MIN(signing_key->blob.length, 16),
+               };
+               int rc;
+
+               if (signing_key->hmac_hnd == NULL) {
+                       rc = gnutls_hmac_init(&signing_key->hmac_hnd,
+                                             GNUTLS_MAC_AES_CMAC_128,
+                                             key.data,
+                                             key.size);
+                       if (rc < 0) {
+                               return NT_STATUS_NO_MEMORY;
+                       }
+               }
+
+               rc = gnutls_hmac(signing_key->hmac_hnd, hdr, SMB2_HDR_SIGNATURE);
+               if (rc < 0) {
+                       return NT_STATUS_INTERNAL_ERROR;
+               }
+
+               rc = gnutls_hmac(signing_key->hmac_hnd, zero_sig, 16);
+               if (rc < 0) {
+                       return NT_STATUS_INTERNAL_ERROR;
+               }
+
+               for (i = 1; i < count; i++) {
+                       rc = gnutls_hmac(signing_key->hmac_hnd,
+                                        vector[i].iov_base,
+                                        vector[i].iov_len);
+                       if (rc < 0) {
+                               return NT_STATUS_INTERNAL_ERROR;
+                       }
+               }
+               gnutls_hmac_output(signing_key->hmac_hnd, res);
+#else /* NOT HAVE_GNUTLS_AES_CMAC */
                struct aes_cmac_128_context ctx;
                uint8_t key[AES_BLOCK_SIZE] = {0};
 
@@ -234,6 +271,7 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
                aes_cmac_128_final(&ctx, res);
 
                ZERO_ARRAY(key);
+#endif
        } else {
                uint8_t digest[gnutls_hash_get_len(GNUTLS_MAC_SHA256)];
                int rc;