143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
#define HOOK_NAME "resource"
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#include <dix-config.h>
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#include <X11/extensions/XI2proto.h>
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#include "dix/dix_priv.h"
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#include "dix/extension_priv.h"
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#include "dix/registry_priv.h"
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#include "dix/window_priv.h"
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#include "Xext/xacestr.h"
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#include "namespace.h"
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#include "hooks.h"
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static int checkAllowed(Mask requested, Mask allowed) {
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return ((requested & allowed) == requested);
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}
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void hookResourceAccess(CallbackListPtr *pcbl, void *unused, void *calldata)
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{
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XNS_HOOK_HEAD(XaceResourceAccessRec);
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ClientPtr owner = dixLookupXIDOwner(param->id);
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struct XnamespaceClientPriv *obj = XnsClientPriv(owner);
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// server can do anything
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if (param->client == serverClient)
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goto pass;
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// special filtering for windows: block transparency for untrusted clients
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if (param->rtype == X11_RESTYPE_WINDOW) {
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WindowPtr pWindow = (WindowPtr) param->res;
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if (param->access_mode & DixCreateAccess) {
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if (!subj->ns->allowTransparency) {
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pWindow->forcedBG = TRUE;
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}
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}
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}
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// resource access inside same container is always permitted
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if (XnsClientSameNS(subj, obj))
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goto pass;
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// check for root windows (screen or ns-virtual)
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if (param->rtype == X11_RESTYPE_WINDOW) {
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WindowPtr pWindow = (WindowPtr) param->res;
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/* white-listed operations on namespace's virtual root window */
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if (pWindow == subj->ns->rootWindow) {
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switch (client->majorOp) {
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case X_DeleteProperty:
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case X_ChangeProperty:
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case X_GetProperty:
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case X_RotateProperties:
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case X_QueryTree:
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goto pass;
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}
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XNS_HOOK_LOG("unhandled access to NS' virtual root window 0x%0x\n", pWindow->drawable.id);
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}
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/* white-listed operations on actual root window */
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if (pWindow && (pWindow == pWindow->drawable.pScreen->root)) {
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switch (client->majorOp) {
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case X_CreateWindow:
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if (checkAllowed(param->access_mode, DixAddAccess))
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goto pass;
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break;
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case X_CreateGC:
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case X_CreatePixmap:
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if (checkAllowed(param->access_mode, DixGetAttrAccess))
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goto pass;
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break;
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// we reach here when destroying a top-level window:
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// ProcDestroyWindow() checks whether one may remove a child
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// from it's parent.
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case X_DestroyWindow:
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if (param->access_mode == DixRemoveAccess)
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goto pass;
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break;
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case X_TranslateCoords:
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case X_QueryTree:
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goto pass;
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case X_ChangeWindowAttributes:
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case X_QueryPointer:
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goto reject;
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case X_SendEvent:
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/* send hook needs to take care of this */
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goto pass;
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case EXTENSION_MAJOR_XINPUT:
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switch(client->minorOp) {
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// needed by xeyes. we should filter the mask
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case X_XISelectEvents:
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goto pass;
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}
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XNS_HOOK_LOG("unhandled XI operation on (real) root window\n");
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goto reject;
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}
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}
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}
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/* server resources */
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if (obj->isServer) {
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if (param->rtype == X11_RESTYPE_COLORMAP) {
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if (checkAllowed(param->access_mode, DixReadAccess | DixGetPropAccess | DixUseAccess | DixGetAttrAccess | DixAddAccess))
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goto pass;
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}
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if (param->rtype == X11_RESTYPE_WINDOW) {
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/* allowed ones should already been catched above */
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XNS_HOOK_LOG("REJECT server owned window 0x%0x!\n", ((WindowPtr)param->res)->drawable.id);
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goto reject;
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}
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if (checkAllowed(param->access_mode, DixReadAccess))
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goto pass;
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}
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reject: ;
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char accModeStr[128];
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LookupDixAccessName(param->access_mode, (char*)&accModeStr, sizeof(accModeStr));
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XNS_HOOK_LOG("BLOCKED access 0x%07lx %s to %s 0x%06lx of client %d @ %s\n",
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(unsigned long)param->access_mode,
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accModeStr,
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LookupResourceName(param->rtype),
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(unsigned long)param->id,
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owner->index, // resource owner
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obj->ns->name);
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param->status = BadAccess;
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return;
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pass:
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// request is passed as it is (or already had been rewritten)
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param->status = Success;
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}
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