XACE: Add generic support for property and selection polyinstantiation.

Xext/security.c

@@ -910,7 +910,7 @@ SecurityProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
 {    
     XacePropertyAccessRec *rec = calldata;
     SecurityStateRec *subj, *obj;
-    ATOM name = rec->pProp->propertyName;
+    ATOM name = (*rec->ppProp)->propertyName;
     Mask requested = rec->access_mode;
     Mask allowed = SecurityResourceMask | DixReadAccess;
 

Xext/xace.c

@@ -56,16 +56,17 @@ int XaceHookDispatch(ClientPtr client, int major)
 }
 
 int XaceHookPropertyAccess(ClientPtr client, WindowPtr pWin,
-			   PropertyPtr pProp, Mask access_mode)
+			   PropertyPtr *ppProp, Mask access_mode)
 {
-    XacePropertyAccessRec rec = { client, pWin, pProp, access_mode, Success };
+    XacePropertyAccessRec rec = { client, pWin, ppProp, access_mode, Success };
     CallCallbacks(&XaceHooks[XACE_PROPERTY_ACCESS], &rec);
     return rec.status;
 }
 
-int XaceHookSelectionAccess(ClientPtr client, Atom name, Mask access_mode)
+int XaceHookSelectionAccess(ClientPtr client,
+			    Selection **ppSel, Mask access_mode)
 {
-    XaceSelectionAccessRec rec = { client, name, access_mode, Success };
+    XaceSelectionAccessRec rec = { client, ppSel, access_mode, Success };
     CallCallbacks(&XaceHooks[XACE_SELECTION_ACCESS], &rec);
     return rec.status;
 }

Xext/xace.h

@@ -29,6 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "region.h"
 #include "window.h"
 #include "property.h"
+#include "selection.h"
 
 /* Default window background */
 #define XaceBackgroundNoneState(w) ((w)->forcedBG ? BackgroundPixel : None)
@@ -68,9 +69,9 @@ extern int XaceHook(
  */
 extern int XaceHookDispatch(ClientPtr ptr, int major);
 extern int XaceHookPropertyAccess(ClientPtr ptr, WindowPtr pWin,
-				  PropertyPtr pProp, Mask access_mode);
+				  PropertyPtr *ppProp, Mask access_mode);
-extern int XaceHookSelectionAccess(ClientPtr ptr, Atom name,
+extern int XaceHookSelectionAccess(ClientPtr ptr,
-				   Mask access_mode);
+				   Selection **ppSel, Mask access_mode);
 extern void XaceHookAuditEnd(ClientPtr ptr, int result);
 
 /* Register a callback for a given hook.

Xext/xacestr.h

@@ -59,7 +59,7 @@ typedef struct {
 typedef struct {
     ClientPtr client;
     WindowPtr pWin;
-    PropertyPtr pProp;
+    PropertyPtr *ppProp;
     Mask access_mode;
     int status;
 } XacePropertyAccessRec;
@@ -110,7 +110,7 @@ typedef struct {
 /* XACE_SELECTION_ACCESS */
 typedef struct {
     ClientPtr client;
-    Atom name;
+    Selection **ppSel;
     Mask access_mode;
     int status;
 } XaceSelectionAccessRec;

Xext/xselinux.c

@@ -134,7 +134,7 @@ static struct security_class_mapping map[] = {
     { "x_gc", { "", "", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
     { "x_font", { "", "", "destroy", "create", "getattr", "", "", "", "", "", "", "", "add_glyph", "remove_glyph", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
     { "x_colormap", { "read", "write", "destroy", "create", "getattr", "", "", "", "", "", "", "", "add_color", "remove_color", "", "", "", "", "", "", "install", "uninstall", "", "", "use", NULL }},
-    { "x_property", { "read", "write", "destroy", "create", "getattr", "setattr", NULL }},
+    { "x_property", { "read", "write", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "write", NULL }},
     { "x_selection", { "read", "", "", "", "getattr", "setattr", NULL }},
     { "x_cursor", { "read", "write", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
     { "x_client", { "", "", "destroy", "", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "manage", NULL }},
@@ -691,14 +691,15 @@ SELinuxProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
     SELinuxSubjectRec *subj;
     SELinuxObjectRec *obj;
     SELinuxAuditRec auditdata = { .client = rec->client };
+    PropertyPtr pProp = *rec->ppProp;
     int rc;
 
     subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
-    obj = dixLookupPrivate(&rec->pProp->devPrivates, objectKey);
+    obj = dixLookupPrivate(&pProp->devPrivates, objectKey);
 
     /* If this is a new object that needs labeling, do it now */
     if (rec->access_mode & DixCreateAccess) {
-	const char *name = NameForAtom(rec->pProp->propertyName);
+	const char *name = NameForAtom(pProp->propertyName);
 	security_context_t con;
 	security_id_t sid;
 
@@ -729,7 +730,7 @@ SELinuxProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
     }
 
     /* Perform the security check */
-    auditdata.property = rec->pProp->propertyName;
+    auditdata.property = pProp->propertyName;
     rc = SELinuxDoCheck(subj, obj, SECCLASS_X_PROPERTY, rec->access_mode,
 			&auditdata);
     if (rc != Success)
@@ -870,17 +871,21 @@ SELinuxSelection(CallbackListPtr *pcbl, pointer unused, pointer calldata)
     SELinuxSubjectRec *subj;
     SELinuxObjectRec sel_sid;
     SELinuxAuditRec auditdata = { .client = rec->client };
+    Selection *pSel = *rec->ppSel;
     int rc;
 
+    if (rec->access_mode & DixCreateAccess)
+	return; /* don't use create currently */
+
     subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
 
-    rc = SELinuxSelectionToSID(rec->name, &sel_sid);
+    rc = SELinuxSelectionToSID(pSel->selection, &sel_sid);
     if (rc != Success) {
 	rec->status = rc;
 	return;
     }
 
-    auditdata.selection = rec->name;
+    auditdata.selection = pSel->selection;
     rc = SELinuxDoCheck(subj, &sel_sid, SECCLASS_X_SELECTION, rec->access_mode,
 			&auditdata);
     if (rc != Success)
@@ -1206,16 +1211,8 @@ ProcSELinuxGetPropertyContext(ClientPtr client)
     if (rc != Success)
 	return rc;
 
-    pProp = wUserProps(pWin);
+    rc = dixLookupProperty(&pProp, pWin, stuff->property, client,
-    while (pProp) {
+			   DixGetAttrAccess);
-	if (pProp->propertyName == stuff->property)
-	    break;
-	pProp = pProp->next;
-    }
-    if (!pProp)
-	return BadValue;
-
-    rc = XaceHookPropertyAccess(client, pWin, pProp, DixGetAttrAccess);
     if (rc != Success)
 	return rc;
 

dix/property.c

@@ -103,7 +103,7 @@ dixLookupProperty(PropertyPtr *result, WindowPtr pWin, Atom propertyName,
 	    break;
 
     if (pProp)
-	rc = XaceHookPropertyAccess(client, pWin, pProp, access_mode);
+	rc = XaceHookPropertyAccess(client, pWin, &pProp, access_mode);
     *result = pProp;
     return rc;
 }
@@ -256,12 +256,14 @@ dixChangeWindowProperty(ClientPtr pClient, WindowPtr pWin, Atom property,
     PropertyPtr pProp;
     int sizeInBytes, totalSize, rc;
     pointer data;
+    Mask access_mode;
 
     sizeInBytes = format>>3;
     totalSize = len * sizeInBytes;
+    access_mode = (mode == PropModeReplace) ? DixWriteAccess : DixBlendAccess;
 
     /* first see if property already exists */
-    rc = dixLookupProperty(&pProp, pWin, property, pClient, DixWriteAccess);
+    rc = dixLookupProperty(&pProp, pWin, property, pClient, access_mode);
 
     if (rc == BadMatch)   /* just add to list */
     {
@@ -284,7 +286,7 @@ dixChangeWindowProperty(ClientPtr pClient, WindowPtr pWin, Atom property,
 	    memmove((char *)data, (char *)value, totalSize);
 	pProp->size = len;
 	pProp->devPrivates = NULL;
-	rc = XaceHookPropertyAccess(pClient, pWin, pProp,
+	rc = XaceHookPropertyAccess(pClient, pWin, &pProp,
 				    DixCreateAccess|DixWriteAccess);
 	if (rc != Success) {
 	    xfree(data);
@@ -588,7 +590,7 @@ ProcListProperties(ClientPtr client)
     temppAtoms = pAtoms;
     for (pProp = wUserProps(pWin); pProp; pProp = pProp->next) {
 	realProp = pProp;
-	rc = XaceHookPropertyAccess(client, pWin, pProp, DixGetAttrAccess);
+	rc = XaceHookPropertyAccess(client, pWin, &realProp, DixGetAttrAccess);
 	if (rc == Success && realProp == pProp) {
 	    *temppAtoms++ = pProp->propertyName;
 	    numProps++;

dix/selection.c

@@ -80,7 +80,7 @@ dixLookupSelection(Selection **result, Atom selectionName,
     for (i = 0; i < NumCurrentSelections; i++)
 	if (CurrentSelections[i].selection == selectionName) {
 	    pSel = CurrentSelections + i;
-	    rc = XaceHookSelectionAccess(client, selectionName, access_mode);
+	    rc = XaceHookSelectionAccess(client, &pSel, access_mode);
 	    break;
 	}
 
@@ -206,6 +206,10 @@ ProcSetSelectionOwner(ClientPtr client)
 	pSel = CurrentSelections + NumCurrentSelections;
 	pSel->selection = stuff->selection;
 	pSel->devPrivates = NULL;
+
+	/* security creation/labeling check */
+	(void)XaceHookSelectionAccess(client, &pSel, DixCreateAccess);
+
 	pSel->next = NULL;
 	if (NumCurrentSelections > 0)
 	    CurrentSelections[NumCurrentSelections - 1].next = pSel;