secur32: Use gnutls_record_get_max_size() to get the maximum message size.

dlls/secur32/schannel.c

@@ -821,13 +821,15 @@ static SECURITY_STATUS SEC_ENTRY schan_QueryContextAttributesW(
                 SecPkgContext_StreamSizes *stream_sizes = buffer;
                 SIZE_T mac_size = info.dwHashStrength;
                 unsigned int block_size = schan_imp_get_session_cipher_block_size(ctx->session);
+                unsigned int message_size = schan_imp_get_max_message_size(ctx->session);
 
-                TRACE("Using %lu mac bytes, block size %u\n", mac_size, block_size);
+                TRACE("Using %lu mac bytes, message size %u, block size %u\n",
+                        mac_size, message_size, block_size);
 
                 /* These are defined by the TLS RFC */
                 stream_sizes->cbHeader = 5;
                 stream_sizes->cbTrailer = mac_size + 256; /* Max 255 bytes padding + 1 for padding size */
-                stream_sizes->cbMaximumMessage = 1 << 14;
+                stream_sizes->cbMaximumMessage = message_size;
                 stream_sizes->cbBuffers = 4;
                 stream_sizes->cbBlockSize = block_size;
             }

dlls/secur32/schannel_gnutls.c

@@ -62,6 +62,7 @@ MAKE_FUNCPTR(gnutls_mac_get_key_size);
 MAKE_FUNCPTR(gnutls_perror);
 MAKE_FUNCPTR(gnutls_protocol_get_version);
 MAKE_FUNCPTR(gnutls_set_default_priority);
+MAKE_FUNCPTR(gnutls_record_get_max_size);
 MAKE_FUNCPTR(gnutls_record_recv);
 MAKE_FUNCPTR(gnutls_record_send);
 MAKE_FUNCPTR(gnutls_transport_set_errno);
@@ -289,6 +290,11 @@ unsigned int schan_imp_get_session_cipher_block_size(schan_imp_session session)
     return schannel_get_cipher_block_size(cipher);
 }
 
+unsigned int schan_imp_get_max_message_size(schan_imp_session session)
+{
+    return pgnutls_record_get_max_size((gnutls_session_t)session);
+}
+
 SECURITY_STATUS schan_imp_get_connection_info(schan_imp_session session,
                                               SecPkgContext_ConnectionInfo *info)
 {
@@ -423,6 +429,7 @@ BOOL schan_imp_init(void)
     LOAD_FUNCPTR(gnutls_perror)
     LOAD_FUNCPTR(gnutls_protocol_get_version)
     LOAD_FUNCPTR(gnutls_set_default_priority)
+    LOAD_FUNCPTR(gnutls_record_get_max_size);
     LOAD_FUNCPTR(gnutls_record_recv);
     LOAD_FUNCPTR(gnutls_record_send);
     LOAD_FUNCPTR(gnutls_transport_set_errno)

dlls/secur32/schannel_macosx.c

@@ -628,6 +628,12 @@ unsigned int schan_imp_get_session_cipher_block_size(schan_imp_session session)
     }
 }
 
+unsigned int schan_imp_get_max_message_size(schan_imp_session session)
+{
+    FIXME("Returning 1 << 14.\n");
+    return 1 << 14;
+}
+
 SECURITY_STATUS schan_imp_get_connection_info(schan_imp_session session,
                                               SecPkgContext_ConnectionInfo *info)
 {

dlls/secur32/secur32_priv.h

@@ -196,6 +196,7 @@ extern void schan_imp_set_session_transport(schan_imp_session session,
                                             struct schan_transport *t) DECLSPEC_HIDDEN;
 extern SECURITY_STATUS schan_imp_handshake(schan_imp_session session) DECLSPEC_HIDDEN;
 extern unsigned int schan_imp_get_session_cipher_block_size(schan_imp_session session) DECLSPEC_HIDDEN;
+extern unsigned int schan_imp_get_max_message_size(schan_imp_session session) DECLSPEC_HIDDEN;
 extern SECURITY_STATUS schan_imp_get_connection_info(schan_imp_session session,
                                                      SecPkgContext_ConnectionInfo *info) DECLSPEC_HIDDEN;
 extern SECURITY_STATUS schan_imp_get_session_peer_certificate(schan_imp_session session,