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Xnamespace: filter device access 

Filter device access, whitelist several commonly used operations that
should be safe (eg. query keyboard layout).

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2025-03-19 10:50:56 +01:00
parent 7afdba1952
commit e293308ef7
4 changed files with 56 additions and 0 deletions
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53
Xext/namespace/hook-device.c Normal file
View File

@ -0,0 +1,53 @@
#define HOOK_NAME "device"
#include <dix-config.h>
#include <X11/extensions/XKB.h>
#include "dix/dix_priv.h"
#include "dix/extension_priv.h"
#include "dix/registry_priv.h"
#include "Xext/xacestr.h"
#include "namespace.h"
#include "hooks.h"
void hookDevice(CallbackListPtr *pcbl, void *unused, void *calldata)
{
XNS_HOOK_HEAD(XaceDeviceAccessRec);
if (subj->ns->superPower)
goto pass;
// should be safe to pass for anybody
switch (client->majorOp) {
case X_QueryPointer:
case X_GetInputFocus:
case X_GetKeyboardMapping:
case X_GetModifierMapping:
case X_GrabButton: // needed by xterm -- should be safe
goto pass;
case EXTENSION_MAJOR_XKEYBOARD:
switch(client->minorOp) {
case X_kbSelectEvents: // needed by xterm
case X_kbGetMap: // needed by xterm
case X_kbBell: // needed by GIMP
case X_kbPerClientFlags: // needed by firefox
case X_kbGetState: // needed by firefox
case X_kbGetNames: // needed by firefox
case X_kbGetControls: // needed by firefox
goto pass;
default:
XNS_HOOK_LOG("BLOCKED unhandled XKEYBOARD %s\n", LookupRequestName(client->majorOp, client->minorOp));
goto block;
}
}
block:
param->status = BadAccess;
return;
pass:
param->status = Success;
return;
}

1
Xext/namespace/hooks.h
View File

@ -25,6 +25,7 @@
struct XnamespaceClientPriv *subj = XnsClientPriv(client);
void hookClientState(CallbackListPtr *pcbl, void *unused, void *calldata);
void hookDevice(CallbackListPtr *pcbl, void *unused, void *calldata);
void hookExtAccess(CallbackListPtr *pcbl, void *unused, void *calldata);
void hookExtDispatch(CallbackListPtr *pcbl, void *unused, void *calldata);
void hookInitRootWindow(CallbackListPtr *pcbl, void *unused, void *calldata);

1
Xext/namespace/meson.build
View File

@ -3,6 +3,7 @@ libxserver_namespace = static_library(
[
'config.c',
'hook-clientstate.c',
'hook-device.c',
'hook-ext-access.c',
'hook-ext-dispatch.c',
'hook-init-rootwindow.c',

1
Xext/namespace/namespace.c
View File

@ -34,6 +34,7 @@ NamespaceExtensionInit(void)
AddCallback(&PostInitRootWindowCallback, hookInitRootWindow, NULL) &&
AddCallback(&PropertyFilterCallback, hookWindowProperty, NULL) &&
AddCallback(&SelectionFilterCallback, hookSelectionFilter, NULL) &&
XaceRegisterCallback(XACE_DEVICE_ACCESS, hookDevice, NULL) &&
XaceRegisterCallback(XACE_EXT_DISPATCH, hookExtDispatch, NULL) &&
XaceRegisterCallback(XACE_EXT_ACCESS, hookExtAccess, NULL) &&
XaceRegisterCallback(XACE_RECEIVE_ACCESS, hookReceive, NULL) &&