2039 lines
58 KiB
C
2039 lines
58 KiB
C
/************************************************************
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Author: Eamon Walsh <ewalsh@epoch.ncsc.mil>
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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this permission notice appear in supporting documentation. This permission
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notice shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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********************************************************/
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/*
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* Portions of this code copyright (c) 2005 by Trusted Computer Solutions, Inc.
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* All rights reserved.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <sys/socket.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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#include <selinux/avc.h>
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#include <libaudit.h>
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#include <X11/Xatom.h>
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#include "globals.h"
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#include "resource.h"
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#include "privates.h"
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#include "registry.h"
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#include "dixstruct.h"
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#include "inputstr.h"
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#include "windowstr.h"
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#include "propertyst.h"
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#include "extnsionst.h"
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#include "scrnintstr.h"
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#include "selection.h"
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#include "xacestr.h"
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#include "xselinux.h"
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#define XSERV_t
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#define TRANS_SERVER
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#include <X11/Xtrans/Xtrans.h>
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#include "../os/osdep.h"
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#include "modinit.h"
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/*
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* Globals
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*/
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/* private state keys */
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static DevPrivateKey subjectKey = &subjectKey;
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static DevPrivateKey objectKey = &objectKey;
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static DevPrivateKey dataKey = &dataKey;
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/* subject state (clients and devices only) */
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typedef struct {
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security_id_t sid;
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security_id_t dev_create_sid;
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security_id_t win_create_sid;
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security_id_t sel_create_sid;
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security_id_t prp_create_sid;
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security_id_t sel_use_sid;
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security_id_t prp_use_sid;
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struct avc_entry_ref aeref;
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char *command;
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int privileged;
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} SELinuxSubjectRec;
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/* object state */
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typedef struct {
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security_id_t sid;
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int poly;
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} SELinuxObjectRec;
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/* selection and property atom cache */
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typedef struct {
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SELinuxObjectRec prp;
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SELinuxObjectRec sel;
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} SELinuxAtomRec;
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/* audit file descriptor */
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static int audit_fd;
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/* structure passed to auditing callback */
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typedef struct {
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ClientPtr client; /* client */
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DeviceIntPtr dev; /* device */
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char *command; /* client's executable path */
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unsigned id; /* resource id, if any */
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int restype; /* resource type, if any */
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int event; /* event type, if any */
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Atom property; /* property name, if any */
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Atom selection; /* selection name, if any */
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char *extension; /* extension name, if any */
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} SELinuxAuditRec;
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/* labeling handle */
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static struct selabel_handle *label_hnd;
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/* whether AVC is active */
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static int avc_active;
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/* atoms for window label properties */
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static Atom atom_ctx;
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static Atom atom_client_ctx;
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/* The unlabeled SID */
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static security_id_t unlabeled_sid;
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/* Array of object classes indexed by resource type */
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static security_class_t *knownTypes;
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static unsigned numKnownTypes;
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/* Array of event SIDs indexed by event type */
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static security_id_t *knownEvents;
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static unsigned numKnownEvents;
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/* Array of property and selection SID structures */
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static SELinuxAtomRec *knownAtoms;
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static unsigned numKnownAtoms;
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/* dynamically allocated security classes and permissions */
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static struct security_class_mapping map[] = {
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{ "x_drawable", { "read", "write", "destroy", "create", "getattr", "setattr", "list_property", "get_property", "set_property", "", "", "list_child", "add_child", "remove_child", "hide", "show", "blend", "override", "", "", "", "", "send", "receive", "", "manage", NULL }},
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{ "x_screen", { "", "", "", "", "getattr", "setattr", "saver_getattr", "saver_setattr", "", "", "", "", "", "", "hide_cursor", "show_cursor", "saver_hide", "saver_show", NULL }},
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{ "x_gc", { "", "", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
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{ "x_font", { "", "", "destroy", "create", "getattr", "", "", "", "", "", "", "", "add_glyph", "remove_glyph", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
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{ "x_colormap", { "read", "write", "destroy", "create", "getattr", "", "", "", "", "", "", "", "add_color", "remove_color", "", "", "", "", "", "", "install", "uninstall", "", "", "use", NULL }},
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{ "x_property", { "read", "write", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "write", NULL }},
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{ "x_selection", { "read", "", "", "setattr", "getattr", "setattr", NULL }},
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{ "x_cursor", { "read", "write", "destroy", "create", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
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{ "x_client", { "", "", "destroy", "", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "manage", NULL }},
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{ "x_device", { "read", "write", "", "", "getattr", "setattr", "", "", "", "getfocus", "setfocus", "", "", "", "", "", "", "grab", "freeze", "force_cursor", "", "", "", "", "use", "manage", "", "bell", NULL }},
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{ "x_server", { "record", "", "", "", "getattr", "setattr", "", "", "", "", "", "", "", "", "", "", "", "grab", "", "", "", "", "", "", "", "manage", "debug", NULL }},
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{ "x_extension", { "", "", "", "", "query", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "use", NULL }},
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{ "x_event", { "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "send", "receive", NULL }},
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{ "x_synthetic_event", { "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "send", "receive", NULL }},
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{ "x_resource", { "read", "write", "write", "write", "read", "write", "read", "read", "write", "read", "write", "read", "write", "write", "write", "read", "read", "write", "write", "write", "write", "write", "write", "read", "read", "write", "read", "write", NULL }},
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{ NULL }
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};
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/* x_resource "read" bits from the list above */
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#define SELinuxReadMask (DixReadAccess|DixGetAttrAccess|DixListPropAccess| \
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DixGetPropAccess|DixGetFocusAccess|DixListAccess| \
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DixShowAccess|DixBlendAccess|DixReceiveAccess| \
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DixUseAccess|DixDebugAccess)
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/* forward declarations */
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static void SELinuxScreen(CallbackListPtr *, pointer, pointer);
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/* "true" pointer value for use as callback data */
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static pointer truep = (pointer)1;
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/*
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* Support Routines
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*/
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/*
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* Looks up a name in the selection or property mappings
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*/
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static int
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SELinuxAtomToSIDLookup(Atom atom, SELinuxObjectRec *obj, int map, int polymap)
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{
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const char *name = NameForAtom(atom);
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security_context_t ctx;
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int rc = Success;
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obj->poly = 1;
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/* Look in the mappings of names to contexts */
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if (selabel_lookup(label_hnd, &ctx, name, map) == 0) {
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obj->poly = 0;
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} else if (errno != ENOENT) {
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ErrorF("SELinux: a property label lookup failed!\n");
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return BadValue;
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} else if (selabel_lookup(label_hnd, &ctx, name, polymap) < 0) {
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ErrorF("SELinux: a property label lookup failed!\n");
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return BadValue;
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}
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/* Get a SID for context */
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if (avc_context_to_sid(ctx, &obj->sid) < 0) {
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ErrorF("SELinux: a context_to_SID call failed!\n");
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rc = BadAlloc;
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}
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freecon(ctx);
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return rc;
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}
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/*
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* Looks up the SID corresponding to the given property or selection atom
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*/
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static int
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SELinuxAtomToSID(Atom atom, int prop, SELinuxObjectRec **obj_rtn)
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{
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SELinuxObjectRec *obj;
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int rc, map, polymap;
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if (atom >= numKnownAtoms) {
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/* Need to increase size of atoms array */
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unsigned size = sizeof(SELinuxAtomRec);
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knownAtoms = xrealloc(knownAtoms, (atom + 1) * size);
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if (!knownAtoms)
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return BadAlloc;
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memset(knownAtoms + numKnownAtoms, 0,
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(atom - numKnownAtoms + 1) * size);
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numKnownAtoms = atom + 1;
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}
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if (prop) {
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obj = &knownAtoms[atom].prp;
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map = SELABEL_X_PROP;
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polymap = SELABEL_X_POLYPROP;
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} else {
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obj = &knownAtoms[atom].sel;
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map = SELABEL_X_SELN;
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polymap = SELABEL_X_POLYSELN;
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}
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if (!obj->sid) {
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rc = SELinuxAtomToSIDLookup(atom, obj, map, polymap);
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if (rc != Success)
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goto out;
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}
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*obj_rtn = obj;
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rc = Success;
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out:
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return rc;
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}
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/*
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* Looks up a SID for a selection/subject pair
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*/
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static int
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SELinuxSelectionToSID(Atom selection, SELinuxSubjectRec *subj,
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security_id_t *sid_rtn, int *poly_rtn)
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{
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int rc;
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SELinuxObjectRec *obj;
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security_id_t tsid;
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/* Get the default context and polyinstantiation bit */
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rc = SELinuxAtomToSID(selection, 0, &obj);
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if (rc != Success)
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return rc;
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/* Check for an override context next */
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if (subj->sel_use_sid) {
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sidget(tsid = subj->sel_use_sid);
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goto out;
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}
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sidget(tsid = obj->sid);
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/* Polyinstantiate if necessary to obtain the final SID */
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if (obj->poly) {
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sidput(tsid);
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if (avc_compute_member(subj->sid, obj->sid,
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SECCLASS_X_SELECTION, &tsid) < 0) {
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ErrorF("SELinux: a compute_member call failed!\n");
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return BadValue;
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}
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}
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out:
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*sid_rtn = tsid;
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if (poly_rtn)
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*poly_rtn = obj->poly;
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return Success;
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}
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/*
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* Looks up a SID for a property/subject pair
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*/
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static int
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SELinuxPropertyToSID(Atom property, SELinuxSubjectRec *subj,
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security_id_t *sid_rtn, int *poly_rtn)
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{
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int rc;
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SELinuxObjectRec *obj;
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security_id_t tsid, tsid2;
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/* Get the default context and polyinstantiation bit */
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rc = SELinuxAtomToSID(property, 1, &obj);
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if (rc != Success)
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return rc;
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/* Check for an override context next */
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if (subj->prp_use_sid) {
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sidget(tsid = subj->prp_use_sid);
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goto out;
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}
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/* Perform a transition */
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if (avc_compute_create(subj->sid, obj->sid,
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SECCLASS_X_PROPERTY, &tsid) < 0) {
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ErrorF("SELinux: a compute_create call failed!\n");
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return BadValue;
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}
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/* Polyinstantiate if necessary to obtain the final SID */
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if (obj->poly) {
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tsid2 = tsid;
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if (avc_compute_member(subj->sid, tsid2,
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SECCLASS_X_PROPERTY, &tsid) < 0) {
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ErrorF("SELinux: a compute_member call failed!\n");
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sidput(tsid2);
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return BadValue;
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}
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sidput(tsid2);
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}
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out:
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*sid_rtn = tsid;
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if (poly_rtn)
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*poly_rtn = obj->poly;
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return Success;
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}
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/*
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* Looks up the SID corresponding to the given event type
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*/
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static int
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SELinuxEventToSID(unsigned type, security_id_t sid_of_window,
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SELinuxObjectRec *sid_return)
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{
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const char *name = LookupEventName(type);
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security_context_t con;
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type &= 127;
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if (type >= numKnownEvents) {
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/* Need to increase size of classes array */
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unsigned size = sizeof(security_id_t);
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knownEvents = xrealloc(knownEvents, (type + 1) * size);
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if (!knownEvents)
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return BadAlloc;
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memset(knownEvents + numKnownEvents, 0,
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(type - numKnownEvents + 1) * size);
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numKnownEvents = type + 1;
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}
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if (!knownEvents[type]) {
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/* Look in the mappings of event names to contexts */
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if (selabel_lookup(label_hnd, &con, name, SELABEL_X_EVENT) < 0) {
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ErrorF("SELinux: an event label lookup failed!\n");
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return BadValue;
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}
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/* Get a SID for context */
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if (avc_context_to_sid(con, knownEvents + type) < 0) {
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ErrorF("SELinux: a context_to_SID call failed!\n");
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return BadAlloc;
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}
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freecon(con);
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}
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|
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/* Perform a transition to obtain the final SID */
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if (avc_compute_create(sid_of_window, knownEvents[type], SECCLASS_X_EVENT,
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&sid_return->sid) < 0) {
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ErrorF("SELinux: a compute_create call failed!\n");
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return BadValue;
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}
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return Success;
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}
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|
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/*
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* Returns the object class corresponding to the given resource type.
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*/
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static security_class_t
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SELinuxTypeToClass(RESTYPE type)
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{
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RESTYPE fulltype = type;
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type &= TypeMask;
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|
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if (type >= numKnownTypes) {
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/* Need to increase size of classes array */
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unsigned size = sizeof(security_class_t);
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knownTypes = xrealloc(knownTypes, (type + 1) * size);
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if (!knownTypes)
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return 0;
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memset(knownTypes + numKnownTypes, 0,
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(type - numKnownTypes + 1) * size);
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numKnownTypes = type + 1;
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}
|
|
|
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if (!knownTypes[type]) {
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const char *str;
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knownTypes[type] = SECCLASS_X_RESOURCE;
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|
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if (fulltype & RC_DRAWABLE)
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knownTypes[type] = SECCLASS_X_DRAWABLE;
|
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if (fulltype == RT_GC)
|
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knownTypes[type] = SECCLASS_X_GC;
|
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if (fulltype == RT_FONT)
|
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knownTypes[type] = SECCLASS_X_FONT;
|
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if (fulltype == RT_CURSOR)
|
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knownTypes[type] = SECCLASS_X_CURSOR;
|
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if (fulltype == RT_COLORMAP)
|
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knownTypes[type] = SECCLASS_X_COLORMAP;
|
|
|
|
/* Need to do a string lookup */
|
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str = LookupResourceName(fulltype);
|
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if (!strcmp(str, "PICTURE"))
|
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knownTypes[type] = SECCLASS_X_DRAWABLE;
|
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if (!strcmp(str, "GLYPHSET"))
|
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knownTypes[type] = SECCLASS_X_FONT;
|
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}
|
|
|
|
return knownTypes[type];
|
|
}
|
|
|
|
/*
|
|
* Performs an SELinux permission check.
|
|
*/
|
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static int
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SELinuxDoCheck(SELinuxSubjectRec *subj, SELinuxObjectRec *obj,
|
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security_class_t class, Mask mode, SELinuxAuditRec *auditdata)
|
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{
|
|
/* serverClient requests OK */
|
|
if (subj->privileged)
|
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return Success;
|
|
|
|
auditdata->command = subj->command;
|
|
errno = 0;
|
|
|
|
if (avc_has_perm(subj->sid, obj->sid, class, mode, &subj->aeref,
|
|
auditdata) < 0) {
|
|
if (mode == DixUnknownAccess)
|
|
return Success; /* DixUnknownAccess requests OK ... for now */
|
|
if (errno == EACCES)
|
|
return BadAccess;
|
|
ErrorF("SELinux: avc_has_perm: unexpected error %d\n", errno);
|
|
return BadValue;
|
|
}
|
|
|
|
return Success;
|
|
}
|
|
|
|
/*
|
|
* Labels a newly connected client.
|
|
*/
|
|
static void
|
|
SELinuxLabelClient(ClientPtr client)
|
|
{
|
|
XtransConnInfo ci = ((OsCommPtr)client->osPrivate)->trans_conn;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
security_context_t ctx;
|
|
|
|
subj = dixLookupPrivate(&client->devPrivates, subjectKey);
|
|
sidput(subj->sid);
|
|
obj = dixLookupPrivate(&client->devPrivates, objectKey);
|
|
sidput(obj->sid);
|
|
|
|
if (_XSERVTransIsLocal(ci)) {
|
|
int fd = _XSERVTransGetConnectionNumber(ci);
|
|
struct ucred creds;
|
|
socklen_t len = sizeof(creds);
|
|
char path[PATH_MAX + 1];
|
|
size_t bytes;
|
|
|
|
/* For local clients, can get context from the socket */
|
|
if (getpeercon(fd, &ctx) < 0)
|
|
FatalError("SELinux: client %d: couldn't get context from socket\n",
|
|
client->index);
|
|
|
|
/* Try and determine the client's executable name */
|
|
memset(&creds, 0, sizeof(creds));
|
|
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &creds, &len) < 0)
|
|
goto finish;
|
|
|
|
snprintf(path, PATH_MAX + 1, "/proc/%d/cmdline", creds.pid);
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
goto finish;
|
|
|
|
bytes = read(fd, path, PATH_MAX + 1);
|
|
close(fd);
|
|
if (bytes <= 0)
|
|
goto finish;
|
|
|
|
subj->command = xalloc(bytes);
|
|
if (!subj->command)
|
|
goto finish;
|
|
|
|
memcpy(subj->command, path, bytes);
|
|
subj->command[bytes - 1] = 0;
|
|
} else
|
|
/* For remote clients, need to use a default context */
|
|
if (selabel_lookup(label_hnd, &ctx, NULL, SELABEL_X_CLIENT) < 0)
|
|
FatalError("SELinux: failed to look up remote-client context\n");
|
|
|
|
finish:
|
|
/* Get a SID from the context */
|
|
if (avc_context_to_sid(ctx, &subj->sid) < 0)
|
|
FatalError("SELinux: client %d: context_to_sid(%s) failed\n",
|
|
client->index, ctx);
|
|
|
|
sidget(obj->sid = subj->sid);
|
|
freecon(ctx);
|
|
}
|
|
|
|
/*
|
|
* Labels initial server objects.
|
|
*/
|
|
static void
|
|
SELinuxLabelInitial(void)
|
|
{
|
|
int i;
|
|
XaceScreenAccessRec srec;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
security_context_t ctx;
|
|
pointer unused;
|
|
|
|
/* Do the serverClient */
|
|
subj = dixLookupPrivate(&serverClient->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&serverClient->devPrivates, objectKey);
|
|
subj->privileged = 1;
|
|
sidput(subj->sid);
|
|
|
|
/* Use the context of the X server process for the serverClient */
|
|
if (getcon(&ctx) < 0)
|
|
FatalError("SELinux: couldn't get context of X server process\n");
|
|
|
|
/* Get a SID from the context */
|
|
if (avc_context_to_sid(ctx, &subj->sid) < 0)
|
|
FatalError("SELinux: serverClient: context_to_sid(%s) failed\n", ctx);
|
|
|
|
sidget(obj->sid = subj->sid);
|
|
freecon(ctx);
|
|
|
|
srec.client = serverClient;
|
|
srec.access_mode = DixCreateAccess;
|
|
srec.status = Success;
|
|
|
|
for (i = 0; i < screenInfo.numScreens; i++) {
|
|
/* Do the screen object */
|
|
srec.screen = screenInfo.screens[i];
|
|
SELinuxScreen(NULL, NULL, &srec);
|
|
|
|
/* Do the default colormap */
|
|
dixLookupResource(&unused, screenInfo.screens[i]->defColormap,
|
|
RT_COLORMAP, serverClient, DixCreateAccess);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Labels new resource objects.
|
|
*/
|
|
static int
|
|
SELinuxLabelResource(XaceResourceAccessRec *rec, SELinuxSubjectRec *subj,
|
|
SELinuxObjectRec *obj, security_class_t class)
|
|
{
|
|
int offset;
|
|
security_id_t tsid;
|
|
|
|
/* Check for a create context */
|
|
if (rec->rtype == RT_WINDOW && subj->win_create_sid) {
|
|
sidget(obj->sid = subj->win_create_sid);
|
|
return Success;
|
|
}
|
|
|
|
if (rec->parent)
|
|
offset = dixLookupPrivateOffset(rec->ptype);
|
|
|
|
if (rec->parent && offset >= 0) {
|
|
/* Use the SID of the parent object in the labeling operation */
|
|
PrivateRec **privatePtr = DEVPRIV_AT(rec->parent, offset);
|
|
SELinuxObjectRec *pobj = dixLookupPrivate(privatePtr, objectKey);
|
|
tsid = pobj->sid;
|
|
} else {
|
|
/* Use the SID of the subject */
|
|
tsid = subj->sid;
|
|
}
|
|
|
|
/* Perform a transition to obtain the final SID */
|
|
if (avc_compute_create(subj->sid, tsid, class, &obj->sid) < 0) {
|
|
ErrorF("SELinux: a compute_create call failed!\n");
|
|
return BadValue;
|
|
}
|
|
|
|
return Success;
|
|
}
|
|
|
|
|
|
/*
|
|
* Libselinux Callbacks
|
|
*/
|
|
|
|
static int
|
|
SELinuxAudit(void *auditdata,
|
|
security_class_t class,
|
|
char *msgbuf,
|
|
size_t msgbufsize)
|
|
{
|
|
SELinuxAuditRec *audit = auditdata;
|
|
ClientPtr client = audit->client;
|
|
char idNum[16], *propertyName, *selectionName;
|
|
int major = -1, minor = -1;
|
|
|
|
if (client) {
|
|
REQUEST(xReq);
|
|
if (stuff) {
|
|
major = stuff->reqType;
|
|
minor = MinorOpcodeOfRequest(client);
|
|
}
|
|
}
|
|
if (audit->id)
|
|
snprintf(idNum, 16, "%x", audit->id);
|
|
|
|
propertyName = audit->property ? NameForAtom(audit->property) : NULL;
|
|
selectionName = audit->selection ? NameForAtom(audit->selection) : NULL;
|
|
|
|
return snprintf(msgbuf, msgbufsize,
|
|
"%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
|
|
(major >= 0) ? "request=" : "",
|
|
(major >= 0) ? LookupRequestName(major, minor) : "",
|
|
audit->command ? " comm=" : "",
|
|
audit->command ? audit->command : "",
|
|
audit->dev ? " xdevice=\"" : "",
|
|
audit->dev ? audit->dev->name : "",
|
|
audit->dev ? "\"" : "",
|
|
audit->id ? " resid=" : "",
|
|
audit->id ? idNum : "",
|
|
audit->restype ? " restype=" : "",
|
|
audit->restype ? LookupResourceName(audit->restype) : "",
|
|
audit->event ? " event=" : "",
|
|
audit->event ? LookupEventName(audit->event & 127) : "",
|
|
audit->property ? " property=" : "",
|
|
audit->property ? propertyName : "",
|
|
audit->selection ? " selection=" : "",
|
|
audit->selection ? selectionName : "",
|
|
audit->extension ? " extension=" : "",
|
|
audit->extension ? audit->extension : "");
|
|
}
|
|
|
|
static int
|
|
SELinuxLog(int type, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char buf[MAX_AUDIT_MESSAGE_LENGTH];
|
|
int rc, aut = AUDIT_USER_AVC;
|
|
|
|
va_start(ap, fmt);
|
|
vsnprintf(buf, MAX_AUDIT_MESSAGE_LENGTH, fmt, ap);
|
|
rc = audit_log_user_avc_message(audit_fd, aut, buf, NULL, NULL, NULL, 0);
|
|
va_end(ap);
|
|
LogMessageVerb(X_WARNING, 0, "%s", buf);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XACE Callbacks
|
|
*/
|
|
|
|
static void
|
|
SELinuxDevice(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceDeviceAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client, .dev = rec->dev };
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&rec->dev->devPrivates, objectKey);
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
if (rec->access_mode & DixCreateAccess) {
|
|
SELinuxSubjectRec *dsubj;
|
|
dsubj = dixLookupPrivate(&rec->dev->devPrivates, subjectKey);
|
|
|
|
sidput(dsubj->sid);
|
|
sidput(obj->sid);
|
|
|
|
if (subj->dev_create_sid) {
|
|
/* Label the device with the create context */
|
|
sidget(obj->sid = subj->dev_create_sid);
|
|
sidget(dsubj->sid = subj->dev_create_sid);
|
|
} else {
|
|
/* Label the device directly with the process SID */
|
|
sidget(obj->sid = subj->sid);
|
|
sidget(dsubj->sid = subj->sid);
|
|
}
|
|
}
|
|
|
|
/* XXX only check read permission on XQueryKeymap */
|
|
/* This is to allow the numerous apps that call XQueryPointer to work */
|
|
if (rec->access_mode & DixReadAccess) {
|
|
ClientPtr client = rec->client;
|
|
REQUEST(xReq);
|
|
if (stuff && stuff->reqType != X_QueryKeymap) {
|
|
rec->access_mode &= ~DixReadAccess;
|
|
rec->access_mode |= DixGetAttrAccess;
|
|
}
|
|
}
|
|
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_DEVICE, rec->access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxSend(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceSendAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj, ev_sid;
|
|
SELinuxAuditRec auditdata = { .client = rec->client, .dev = rec->dev };
|
|
security_class_t class;
|
|
int rc, i, type;
|
|
|
|
if (rec->dev)
|
|
subj = dixLookupPrivate(&rec->dev->devPrivates, subjectKey);
|
|
else
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
|
|
obj = dixLookupPrivate(&rec->pWin->devPrivates, objectKey);
|
|
|
|
/* Check send permission on window */
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_DRAWABLE, DixSendAccess,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
goto err;
|
|
|
|
/* Check send permission on specific event types */
|
|
for (i = 0; i < rec->count; i++) {
|
|
type = rec->events[i].u.u.type;
|
|
class = (type & 128) ? SECCLASS_X_FAKEEVENT : SECCLASS_X_EVENT;
|
|
|
|
rc = SELinuxEventToSID(type, obj->sid, &ev_sid);
|
|
if (rc != Success)
|
|
goto err;
|
|
|
|
auditdata.event = type;
|
|
rc = SELinuxDoCheck(subj, &ev_sid, class, DixSendAccess, &auditdata);
|
|
if (rc != Success)
|
|
goto err;
|
|
}
|
|
return;
|
|
err:
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxReceive(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceReceiveAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj, ev_sid;
|
|
SELinuxAuditRec auditdata = { .client = NULL };
|
|
security_class_t class;
|
|
int rc, i, type;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&rec->pWin->devPrivates, objectKey);
|
|
|
|
/* Check receive permission on window */
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_DRAWABLE, DixReceiveAccess,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
goto err;
|
|
|
|
/* Check receive permission on specific event types */
|
|
for (i = 0; i < rec->count; i++) {
|
|
type = rec->events[i].u.u.type;
|
|
class = (type & 128) ? SECCLASS_X_FAKEEVENT : SECCLASS_X_EVENT;
|
|
|
|
rc = SELinuxEventToSID(type, obj->sid, &ev_sid);
|
|
if (rc != Success)
|
|
goto err;
|
|
|
|
auditdata.event = type;
|
|
rc = SELinuxDoCheck(subj, &ev_sid, class, DixReceiveAccess, &auditdata);
|
|
if (rc != Success)
|
|
goto err;
|
|
}
|
|
return;
|
|
err:
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxExtension(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceExtAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj, *serv;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client };
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&rec->ext->devPrivates, objectKey);
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
/* XXX there should be a separate callback for this */
|
|
if (obj->sid == unlabeled_sid) {
|
|
const char *name = rec->ext->name;
|
|
security_context_t con;
|
|
security_id_t sid;
|
|
|
|
serv = dixLookupPrivate(&serverClient->devPrivates, subjectKey);
|
|
|
|
/* Look in the mappings of extension names to contexts */
|
|
if (selabel_lookup(label_hnd, &con, name, SELABEL_X_EXT) < 0) {
|
|
ErrorF("SELinux: a property label lookup failed!\n");
|
|
rec->status = BadValue;
|
|
return;
|
|
}
|
|
/* Get a SID for context */
|
|
if (avc_context_to_sid(con, &sid) < 0) {
|
|
ErrorF("SELinux: a context_to_SID call failed!\n");
|
|
rec->status = BadAlloc;
|
|
return;
|
|
}
|
|
|
|
sidput(obj->sid);
|
|
|
|
/* Perform a transition to obtain the final SID */
|
|
if (avc_compute_create(serv->sid, sid, SECCLASS_X_EXTENSION,
|
|
&obj->sid) < 0) {
|
|
ErrorF("SELinux: a SID transition call failed!\n");
|
|
freecon(con);
|
|
rec->status = BadValue;
|
|
return;
|
|
}
|
|
freecon(con);
|
|
}
|
|
|
|
/* Perform the security check */
|
|
auditdata.extension = rec->ext->name;
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_EXTENSION, rec->access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxSelection(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceSelectionAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj, *data;
|
|
Selection *pSel = *rec->ppSel;
|
|
Atom name = pSel->selection;
|
|
Mask access_mode = rec->access_mode;
|
|
SELinuxAuditRec auditdata = { .client = rec->client, .selection = name };
|
|
security_id_t tsid;
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&pSel->devPrivates, objectKey);
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
if (access_mode & DixCreateAccess) {
|
|
sidput(obj->sid);
|
|
rc = SELinuxSelectionToSID(name, subj, &obj->sid, &obj->poly);
|
|
if (rc != Success)
|
|
obj->sid = unlabeled_sid;
|
|
access_mode = DixSetAttrAccess;
|
|
}
|
|
/* If this is a polyinstantiated object, find the right instance */
|
|
else if (obj->poly) {
|
|
rc = SELinuxSelectionToSID(name, subj, &tsid, NULL);
|
|
if (rc != Success) {
|
|
rec->status = rc;
|
|
return;
|
|
}
|
|
while (pSel->selection != name || obj->sid != tsid) {
|
|
if ((pSel = pSel->next) == NULL)
|
|
break;
|
|
obj = dixLookupPrivate(&pSel->devPrivates, objectKey);
|
|
}
|
|
sidput(tsid);
|
|
|
|
if (pSel)
|
|
*rec->ppSel = pSel;
|
|
else {
|
|
rec->status = BadMatch;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Perform the security check */
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_SELECTION, access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
|
|
/* Label the content (advisory only) */
|
|
if (access_mode & DixSetAttrAccess) {
|
|
data = dixLookupPrivate(&pSel->devPrivates, dataKey);
|
|
sidput(data->sid);
|
|
if (subj->sel_create_sid)
|
|
sidget(data->sid = subj->sel_create_sid);
|
|
else
|
|
sidget(data->sid = obj->sid);
|
|
}
|
|
}
|
|
|
|
static void
|
|
SELinuxProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XacePropertyAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj, *data;
|
|
PropertyPtr pProp = *rec->ppProp;
|
|
Atom name = pProp->propertyName;
|
|
SELinuxAuditRec auditdata = { .client = rec->client, .property = name };
|
|
security_id_t tsid;
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&pProp->devPrivates, objectKey);
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
if (rec->access_mode & DixCreateAccess) {
|
|
sidput(obj->sid);
|
|
rc = SELinuxPropertyToSID(name, subj, &obj->sid, &obj->poly);
|
|
if (rc != Success) {
|
|
rec->status = rc;
|
|
return;
|
|
}
|
|
}
|
|
/* If this is a polyinstantiated object, find the right instance */
|
|
else if (obj->poly) {
|
|
rc = SELinuxPropertyToSID(name, subj, &tsid, NULL);
|
|
if (rc != Success) {
|
|
rec->status = rc;
|
|
return;
|
|
}
|
|
while (pProp->propertyName != name || obj->sid != tsid) {
|
|
if ((pProp = pProp->next) == NULL)
|
|
break;
|
|
obj = dixLookupPrivate(&pProp->devPrivates, objectKey);
|
|
}
|
|
sidput(tsid);
|
|
|
|
if (pProp)
|
|
*rec->ppProp = pProp;
|
|
else {
|
|
rec->status = BadMatch;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Perform the security check */
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_PROPERTY, rec->access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
|
|
/* Label the content (advisory only) */
|
|
if (rec->access_mode & DixWriteAccess) {
|
|
data = dixLookupPrivate(&pProp->devPrivates, dataKey);
|
|
sidput(data->sid);
|
|
if (subj->prp_create_sid)
|
|
sidget(data->sid = subj->prp_create_sid);
|
|
else
|
|
sidget(data->sid = obj->sid);
|
|
}
|
|
}
|
|
|
|
static void
|
|
SELinuxResource(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceResourceAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client };
|
|
Mask access_mode = rec->access_mode;
|
|
PrivateRec **privatePtr;
|
|
security_class_t class;
|
|
int rc, offset;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
|
|
/* Determine if the resource object has a devPrivates field */
|
|
offset = dixLookupPrivateOffset(rec->rtype);
|
|
if (offset < 0) {
|
|
/* No: use the SID of the owning client */
|
|
class = SECCLASS_X_RESOURCE;
|
|
privatePtr = &clients[CLIENT_ID(rec->id)]->devPrivates;
|
|
obj = dixLookupPrivate(privatePtr, objectKey);
|
|
} else {
|
|
/* Yes: use the SID from the resource object itself */
|
|
class = SELinuxTypeToClass(rec->rtype);
|
|
privatePtr = DEVPRIV_AT(rec->res, offset);
|
|
obj = dixLookupPrivate(privatePtr, objectKey);
|
|
}
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
if (access_mode & DixCreateAccess && offset >= 0) {
|
|
rc = SELinuxLabelResource(rec, subj, obj, class);
|
|
if (rc != Success) {
|
|
rec->status = rc;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Collapse generic resource permissions down to read/write */
|
|
if (class == SECCLASS_X_RESOURCE) {
|
|
access_mode = !!(rec->access_mode & SELinuxReadMask); /* rd */
|
|
access_mode |= !!(rec->access_mode & ~SELinuxReadMask) << 1; /* wr */
|
|
}
|
|
|
|
/* Perform the security check */
|
|
auditdata.restype = rec->rtype;
|
|
auditdata.id = rec->id;
|
|
rc = SELinuxDoCheck(subj, obj, class, access_mode, &auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
|
|
/* Perform the background none check on windows */
|
|
if (access_mode & DixCreateAccess && rec->rtype == RT_WINDOW) {
|
|
rc = SELinuxDoCheck(subj, obj, class, DixBlendAccess, &auditdata);
|
|
if (rc != Success)
|
|
((WindowPtr)rec->res)->forcedBG = TRUE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
SELinuxScreen(CallbackListPtr *pcbl, pointer is_saver, pointer calldata)
|
|
{
|
|
XaceScreenAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client };
|
|
Mask access_mode = rec->access_mode;
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&rec->screen->devPrivates, objectKey);
|
|
|
|
/* If this is a new object that needs labeling, do it now */
|
|
if (access_mode & DixCreateAccess) {
|
|
sidput(obj->sid);
|
|
|
|
/* Perform a transition to obtain the final SID */
|
|
if (avc_compute_create(subj->sid, subj->sid, SECCLASS_X_SCREEN,
|
|
&obj->sid) < 0) {
|
|
ErrorF("SELinux: a compute_create call failed!\n");
|
|
rec->status = BadValue;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (is_saver)
|
|
access_mode <<= 2;
|
|
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_SCREEN, access_mode, &auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxClient(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceClientAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client };
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&rec->target->devPrivates, objectKey);
|
|
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_CLIENT, rec->access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
}
|
|
|
|
static void
|
|
SELinuxServer(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
XaceServerAccessRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
SELinuxAuditRec auditdata = { .client = rec->client };
|
|
int rc;
|
|
|
|
subj = dixLookupPrivate(&rec->client->devPrivates, subjectKey);
|
|
obj = dixLookupPrivate(&serverClient->devPrivates, objectKey);
|
|
|
|
rc = SELinuxDoCheck(subj, obj, SECCLASS_X_SERVER, rec->access_mode,
|
|
&auditdata);
|
|
if (rc != Success)
|
|
rec->status = rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* DIX Callbacks
|
|
*/
|
|
|
|
static void
|
|
SELinuxClientState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
NewClientInfoRec *pci = calldata;
|
|
|
|
switch (pci->client->clientState) {
|
|
case ClientStateInitial:
|
|
SELinuxLabelClient(pci->client);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
SELinuxResourceState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
ResourceStateInfoRec *rec = calldata;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
WindowPtr pWin;
|
|
|
|
if (rec->type != RT_WINDOW)
|
|
return;
|
|
|
|
pWin = (WindowPtr)rec->value;
|
|
subj = dixLookupPrivate(&wClient(pWin)->devPrivates, subjectKey);
|
|
|
|
if (subj->sid) {
|
|
security_context_t ctx;
|
|
int rc = avc_sid_to_context(subj->sid, &ctx);
|
|
if (rc < 0)
|
|
FatalError("SELinux: Failed to get security context!\n");
|
|
rc = dixChangeWindowProperty(serverClient,
|
|
pWin, atom_client_ctx, XA_STRING, 8,
|
|
PropModeReplace, strlen(ctx), ctx, FALSE);
|
|
if (rc != Success)
|
|
FatalError("SELinux: Failed to set label property on window!\n");
|
|
freecon(ctx);
|
|
} else
|
|
FatalError("SELinux: Unexpected unlabeled client found\n");
|
|
|
|
obj = dixLookupPrivate(&pWin->devPrivates, objectKey);
|
|
|
|
if (obj->sid) {
|
|
security_context_t ctx;
|
|
int rc = avc_sid_to_context(obj->sid, &ctx);
|
|
if (rc < 0)
|
|
FatalError("SELinux: Failed to get security context!\n");
|
|
rc = dixChangeWindowProperty(serverClient,
|
|
pWin, atom_ctx, XA_STRING, 8,
|
|
PropModeReplace, strlen(ctx), ctx, FALSE);
|
|
if (rc != Success)
|
|
FatalError("SELinux: Failed to set label property on window!\n");
|
|
freecon(ctx);
|
|
} else
|
|
FatalError("SELinux: Unexpected unlabeled window found\n");
|
|
}
|
|
|
|
|
|
/*
|
|
* DevPrivates Callbacks
|
|
*/
|
|
|
|
static void
|
|
SELinuxSubjectInit(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
PrivateCallbackRec *rec = calldata;
|
|
SELinuxSubjectRec *subj = *rec->value;
|
|
|
|
sidget(unlabeled_sid);
|
|
subj->sid = unlabeled_sid;
|
|
|
|
avc_entry_ref_init(&subj->aeref);
|
|
}
|
|
|
|
static void
|
|
SELinuxSubjectFree(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
PrivateCallbackRec *rec = calldata;
|
|
SELinuxSubjectRec *subj = *rec->value;
|
|
|
|
xfree(subj->command);
|
|
|
|
if (avc_active) {
|
|
sidput(subj->sid);
|
|
sidput(subj->dev_create_sid);
|
|
sidput(subj->win_create_sid);
|
|
sidput(subj->sel_create_sid);
|
|
sidput(subj->prp_create_sid);
|
|
}
|
|
}
|
|
|
|
static void
|
|
SELinuxObjectInit(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
PrivateCallbackRec *rec = calldata;
|
|
SELinuxObjectRec *obj = *rec->value;
|
|
|
|
sidget(unlabeled_sid);
|
|
obj->sid = unlabeled_sid;
|
|
}
|
|
|
|
static void
|
|
SELinuxObjectFree(CallbackListPtr *pcbl, pointer unused, pointer calldata)
|
|
{
|
|
PrivateCallbackRec *rec = calldata;
|
|
SELinuxObjectRec *obj = *rec->value;
|
|
|
|
if (avc_active)
|
|
sidput(obj->sid);
|
|
}
|
|
|
|
|
|
/*
|
|
* Extension Dispatch
|
|
*/
|
|
|
|
#define CTX_DEV offsetof(SELinuxSubjectRec, dev_create_sid)
|
|
#define CTX_WIN offsetof(SELinuxSubjectRec, win_create_sid)
|
|
#define CTX_PRP offsetof(SELinuxSubjectRec, prp_create_sid)
|
|
#define CTX_SEL offsetof(SELinuxSubjectRec, sel_create_sid)
|
|
#define USE_PRP offsetof(SELinuxSubjectRec, prp_use_sid)
|
|
#define USE_SEL offsetof(SELinuxSubjectRec, sel_use_sid)
|
|
|
|
typedef struct {
|
|
security_context_t octx;
|
|
security_context_t dctx;
|
|
CARD32 octx_len;
|
|
CARD32 dctx_len;
|
|
CARD32 id;
|
|
} SELinuxListItemRec;
|
|
|
|
static int
|
|
ProcSELinuxQueryVersion(ClientPtr client)
|
|
{
|
|
SELinuxQueryVersionReply rep;
|
|
|
|
rep.type = X_Reply;
|
|
rep.length = 0;
|
|
rep.sequenceNumber = client->sequence;
|
|
rep.server_major = SELINUX_MAJOR_VERSION;
|
|
rep.server_minor = SELINUX_MINOR_VERSION;
|
|
if (client->swapped) {
|
|
int n;
|
|
swaps(&rep.sequenceNumber, n);
|
|
swapl(&rep.length, n);
|
|
swaps(&rep.server_major, n);
|
|
swaps(&rep.server_minor, n);
|
|
}
|
|
WriteToClient(client, sizeof(rep), (char *)&rep);
|
|
return (client->noClientException);
|
|
}
|
|
|
|
static int
|
|
SELinuxSendContextReply(ClientPtr client, security_id_t sid)
|
|
{
|
|
SELinuxGetContextReply rep;
|
|
security_context_t ctx = NULL;
|
|
int len = 0;
|
|
|
|
if (sid) {
|
|
if (avc_sid_to_context(sid, &ctx) < 0)
|
|
return BadValue;
|
|
len = strlen(ctx) + 1;
|
|
}
|
|
|
|
rep.type = X_Reply;
|
|
rep.length = (len + 3) >> 2;
|
|
rep.sequenceNumber = client->sequence;
|
|
rep.context_len = len;
|
|
|
|
if (client->swapped) {
|
|
int n;
|
|
swapl(&rep.length, n);
|
|
swaps(&rep.sequenceNumber, n);
|
|
swapl(&rep.context_len, n);
|
|
}
|
|
|
|
WriteToClient(client, sizeof(SELinuxGetContextReply), (char *)&rep);
|
|
WriteToClient(client, len, ctx);
|
|
freecon(ctx);
|
|
return client->noClientException;
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxSetCreateContext(ClientPtr client, unsigned offset)
|
|
{
|
|
PrivateRec **privPtr = &client->devPrivates;
|
|
security_id_t *pSid;
|
|
security_context_t ctx;
|
|
char *ptr;
|
|
|
|
REQUEST(SELinuxSetCreateContextReq);
|
|
REQUEST_FIXED_SIZE(SELinuxSetCreateContextReq, stuff->context_len);
|
|
|
|
ctx = (char *)(stuff + 1);
|
|
if (stuff->context_len > 0 && ctx[stuff->context_len - 1])
|
|
return BadLength;
|
|
|
|
if (offset == CTX_DEV) {
|
|
/* Device create context currently requires manage permission */
|
|
int rc = XaceHook(XACE_SERVER_ACCESS, client, DixManageAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
privPtr = &serverClient->devPrivates;
|
|
}
|
|
else if (offset == USE_SEL) {
|
|
/* Selection use context currently requires no selections owned */
|
|
Selection *pSel;
|
|
for (pSel = CurrentSelections; pSel; pSel = pSel->next)
|
|
if (pSel->client == client)
|
|
return BadMatch;
|
|
}
|
|
|
|
ptr = dixLookupPrivate(privPtr, subjectKey);
|
|
pSid = (security_id_t *)(ptr + offset);
|
|
sidput(*pSid);
|
|
*pSid = NULL;
|
|
|
|
if (stuff->context_len > 0) {
|
|
if (security_check_context(ctx) < 0)
|
|
return BadValue;
|
|
if (avc_context_to_sid(ctx, pSid) < 0)
|
|
return BadValue;
|
|
}
|
|
return Success;
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetCreateContext(ClientPtr client, unsigned offset)
|
|
{
|
|
security_id_t *pSid;
|
|
char *ptr;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetCreateContextReq);
|
|
|
|
if (offset == CTX_DEV)
|
|
ptr = dixLookupPrivate(&serverClient->devPrivates, subjectKey);
|
|
else
|
|
ptr = dixLookupPrivate(&client->devPrivates, subjectKey);
|
|
|
|
pSid = (security_id_t *)(ptr + offset);
|
|
return SELinuxSendContextReply(client, *pSid);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxSetDeviceContext(ClientPtr client)
|
|
{
|
|
security_context_t ctx;
|
|
security_id_t sid;
|
|
DeviceIntPtr dev;
|
|
SELinuxSubjectRec *subj;
|
|
SELinuxObjectRec *obj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxSetContextReq);
|
|
REQUEST_FIXED_SIZE(SELinuxSetContextReq, stuff->context_len);
|
|
|
|
ctx = (char *)(stuff + 1);
|
|
if (stuff->context_len < 1 || ctx[stuff->context_len - 1])
|
|
return BadLength;
|
|
|
|
rc = dixLookupDevice(&dev, stuff->id, client, DixManageAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
if (security_check_context(ctx) < 0)
|
|
return BadValue;
|
|
if (avc_context_to_sid(ctx, &sid) < 0)
|
|
return BadValue;
|
|
|
|
subj = dixLookupPrivate(&dev->devPrivates, subjectKey);
|
|
sidput(subj->sid);
|
|
subj->sid = sid;
|
|
obj = dixLookupPrivate(&dev->devPrivates, objectKey);
|
|
sidput(obj->sid);
|
|
sidget(obj->sid = sid);
|
|
|
|
return Success;
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetDeviceContext(ClientPtr client)
|
|
{
|
|
DeviceIntPtr dev;
|
|
SELinuxSubjectRec *subj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxGetContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
|
|
rc = dixLookupDevice(&dev, stuff->id, client, DixGetAttrAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
subj = dixLookupPrivate(&dev->devPrivates, subjectKey);
|
|
return SELinuxSendContextReply(client, subj->sid);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetWindowContext(ClientPtr client)
|
|
{
|
|
WindowPtr pWin;
|
|
SELinuxObjectRec *obj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxGetContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
|
|
rc = dixLookupWindow(&pWin, stuff->id, client, DixGetAttrAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
obj = dixLookupPrivate(&pWin->devPrivates, objectKey);
|
|
return SELinuxSendContextReply(client, obj->sid);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetPropertyContext(ClientPtr client, pointer privKey)
|
|
{
|
|
WindowPtr pWin;
|
|
PropertyPtr pProp;
|
|
SELinuxObjectRec *obj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxGetPropertyContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetPropertyContextReq);
|
|
|
|
rc = dixLookupWindow(&pWin, stuff->window, client, DixGetPropAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
rc = dixLookupProperty(&pProp, pWin, stuff->property, client,
|
|
DixGetAttrAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
obj = dixLookupPrivate(&pProp->devPrivates, privKey);
|
|
return SELinuxSendContextReply(client, obj->sid);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetSelectionContext(ClientPtr client, pointer privKey)
|
|
{
|
|
Selection *pSel;
|
|
SELinuxObjectRec *obj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxGetContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
|
|
rc = dixLookupSelection(&pSel, stuff->id, client, DixGetAttrAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
obj = dixLookupPrivate(&pSel->devPrivates, privKey);
|
|
return SELinuxSendContextReply(client, obj->sid);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxGetClientContext(ClientPtr client)
|
|
{
|
|
ClientPtr target;
|
|
SELinuxSubjectRec *subj;
|
|
int rc;
|
|
|
|
REQUEST(SELinuxGetContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
|
|
rc = dixLookupClient(&target, stuff->id, client, DixGetAttrAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
subj = dixLookupPrivate(&target->devPrivates, subjectKey);
|
|
return SELinuxSendContextReply(client, subj->sid);
|
|
}
|
|
|
|
static int
|
|
SELinuxPopulateItem(SELinuxListItemRec *i, PrivateRec **privPtr, CARD32 id,
|
|
int *size)
|
|
{
|
|
SELinuxObjectRec *obj = dixLookupPrivate(privPtr, objectKey);
|
|
SELinuxObjectRec *data = dixLookupPrivate(privPtr, dataKey);
|
|
|
|
if (avc_sid_to_context(obj->sid, &i->octx) < 0)
|
|
return BadValue;
|
|
if (avc_sid_to_context(data->sid, &i->dctx) < 0)
|
|
return BadValue;
|
|
|
|
i->id = id;
|
|
i->octx_len = (strlen(i->octx) + 4) >> 2;
|
|
i->dctx_len = (strlen(i->dctx) + 4) >> 2;
|
|
|
|
*size += i->octx_len + i->dctx_len + 3;
|
|
return Success;
|
|
}
|
|
|
|
static void
|
|
SELinuxFreeItems(SELinuxListItemRec *items, int count)
|
|
{
|
|
int k;
|
|
for (k = 0; k < count; k++) {
|
|
freecon(items[k].octx);
|
|
freecon(items[k].dctx);
|
|
}
|
|
xfree(items);
|
|
}
|
|
|
|
static int
|
|
SELinuxSendItemsToClient(ClientPtr client, SELinuxListItemRec *items,
|
|
int size, int count)
|
|
{
|
|
int rc, k, n, pos = 0;
|
|
SELinuxListItemsReply rep;
|
|
CARD32 *buf;
|
|
|
|
buf = xcalloc(size, sizeof(CARD32));
|
|
if (!buf) {
|
|
rc = BadAlloc;
|
|
goto out;
|
|
}
|
|
|
|
/* Fill in the buffer */
|
|
for (k = 0; k < count; k++) {
|
|
buf[pos] = items[k].id;
|
|
if (client->swapped)
|
|
swapl(buf + pos, n);
|
|
pos++;
|
|
|
|
buf[pos] = items[k].octx_len * 4;
|
|
if (client->swapped)
|
|
swapl(buf + pos, n);
|
|
pos++;
|
|
|
|
buf[pos] = items[k].dctx_len * 4;
|
|
if (client->swapped)
|
|
swapl(buf + pos, n);
|
|
pos++;
|
|
|
|
memcpy((char *)(buf + pos), items[k].octx, strlen(items[k].octx) + 1);
|
|
pos += items[k].octx_len;
|
|
memcpy((char *)(buf + pos), items[k].dctx, strlen(items[k].dctx) + 1);
|
|
pos += items[k].dctx_len;
|
|
}
|
|
|
|
/* Send reply to client */
|
|
rep.type = X_Reply;
|
|
rep.length = size;
|
|
rep.sequenceNumber = client->sequence;
|
|
rep.count = count;
|
|
|
|
if (client->swapped) {
|
|
swapl(&rep.length, n);
|
|
swaps(&rep.sequenceNumber, n);
|
|
swapl(&rep.count, n);
|
|
}
|
|
|
|
WriteToClient(client, sizeof(SELinuxListItemsReply), (char *)&rep);
|
|
WriteToClient(client, size * 4, (char *)buf);
|
|
|
|
/* Free stuff and return */
|
|
rc = client->noClientException;
|
|
xfree(buf);
|
|
out:
|
|
SELinuxFreeItems(items, count);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxListProperties(ClientPtr client)
|
|
{
|
|
WindowPtr pWin;
|
|
PropertyPtr pProp;
|
|
SELinuxListItemRec *items;
|
|
int rc, count, size, i;
|
|
CARD32 id;
|
|
|
|
REQUEST(SELinuxGetContextReq);
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
|
|
rc = dixLookupWindow(&pWin, stuff->id, client, DixListPropAccess);
|
|
if (rc != Success)
|
|
return rc;
|
|
|
|
/* Count the number of properties and allocate items */
|
|
count = 0;
|
|
for (pProp = wUserProps(pWin); pProp; pProp = pProp->next)
|
|
count++;
|
|
items = xcalloc(count, sizeof(SELinuxListItemRec));
|
|
if (!items)
|
|
return BadAlloc;
|
|
|
|
/* Fill in the items and calculate size */
|
|
i = 0;
|
|
size = 0;
|
|
for (pProp = wUserProps(pWin); pProp; pProp = pProp->next) {
|
|
id = pProp->propertyName;
|
|
rc = SELinuxPopulateItem(items + i, &pProp->devPrivates, id, &size);
|
|
if (rc != Success) {
|
|
SELinuxFreeItems(items, count);
|
|
return rc;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
return SELinuxSendItemsToClient(client, items, size, count);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxListSelections(ClientPtr client)
|
|
{
|
|
Selection *pSel;
|
|
SELinuxListItemRec *items;
|
|
int rc, count, size, i;
|
|
CARD32 id;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetCreateContextReq);
|
|
|
|
/* Count the number of selections and allocate items */
|
|
count = 0;
|
|
for (pSel = CurrentSelections; pSel; pSel = pSel->next)
|
|
count++;
|
|
items = xcalloc(count, sizeof(SELinuxListItemRec));
|
|
if (!items)
|
|
return BadAlloc;
|
|
|
|
/* Fill in the items and calculate size */
|
|
i = 0;
|
|
size = 0;
|
|
for (pSel = CurrentSelections; pSel; pSel = pSel->next) {
|
|
id = pSel->selection;
|
|
rc = SELinuxPopulateItem(items + i, &pSel->devPrivates, id, &size);
|
|
if (rc != Success) {
|
|
SELinuxFreeItems(items, count);
|
|
return rc;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
return SELinuxSendItemsToClient(client, items, size, count);
|
|
}
|
|
|
|
static int
|
|
ProcSELinuxDispatch(ClientPtr client)
|
|
{
|
|
REQUEST(xReq);
|
|
switch (stuff->data) {
|
|
case X_SELinuxQueryVersion:
|
|
return ProcSELinuxQueryVersion(client);
|
|
case X_SELinuxSetDeviceCreateContext:
|
|
return ProcSELinuxSetCreateContext(client, CTX_DEV);
|
|
case X_SELinuxGetDeviceCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_DEV);
|
|
case X_SELinuxSetDeviceContext:
|
|
return ProcSELinuxSetDeviceContext(client);
|
|
case X_SELinuxGetDeviceContext:
|
|
return ProcSELinuxGetDeviceContext(client);
|
|
case X_SELinuxSetWindowCreateContext:
|
|
return ProcSELinuxSetCreateContext(client, CTX_WIN);
|
|
case X_SELinuxGetWindowCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_WIN);
|
|
case X_SELinuxGetWindowContext:
|
|
return ProcSELinuxGetWindowContext(client);
|
|
case X_SELinuxSetPropertyCreateContext:
|
|
return ProcSELinuxSetCreateContext(client, CTX_PRP);
|
|
case X_SELinuxGetPropertyCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_PRP);
|
|
case X_SELinuxSetPropertyUseContext:
|
|
return ProcSELinuxSetCreateContext(client, USE_PRP);
|
|
case X_SELinuxGetPropertyUseContext:
|
|
return ProcSELinuxGetCreateContext(client, USE_PRP);
|
|
case X_SELinuxGetPropertyContext:
|
|
return ProcSELinuxGetPropertyContext(client, objectKey);
|
|
case X_SELinuxGetPropertyDataContext:
|
|
return ProcSELinuxGetPropertyContext(client, dataKey);
|
|
case X_SELinuxListProperties:
|
|
return ProcSELinuxListProperties(client);
|
|
case X_SELinuxSetSelectionCreateContext:
|
|
return ProcSELinuxSetCreateContext(client, CTX_SEL);
|
|
case X_SELinuxGetSelectionCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_SEL);
|
|
case X_SELinuxSetSelectionUseContext:
|
|
return ProcSELinuxSetCreateContext(client, USE_SEL);
|
|
case X_SELinuxGetSelectionUseContext:
|
|
return ProcSELinuxGetCreateContext(client, USE_SEL);
|
|
case X_SELinuxGetSelectionContext:
|
|
return ProcSELinuxGetSelectionContext(client, objectKey);
|
|
case X_SELinuxGetSelectionDataContext:
|
|
return ProcSELinuxGetSelectionContext(client, dataKey);
|
|
case X_SELinuxListSelections:
|
|
return ProcSELinuxListSelections(client);
|
|
case X_SELinuxGetClientContext:
|
|
return ProcSELinuxGetClientContext(client);
|
|
default:
|
|
return BadRequest;
|
|
}
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxQueryVersion(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxQueryVersionReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxQueryVersionReq);
|
|
swaps(&stuff->client_major, n);
|
|
swaps(&stuff->client_minor, n);
|
|
return ProcSELinuxQueryVersion(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxSetCreateContext(ClientPtr client, unsigned offset)
|
|
{
|
|
REQUEST(SELinuxSetCreateContextReq);
|
|
int n;
|
|
|
|
REQUEST_AT_LEAST_SIZE(SELinuxSetCreateContextReq);
|
|
swapl(&stuff->context_len, n);
|
|
return ProcSELinuxSetCreateContext(client, offset);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxSetDeviceContext(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxSetContextReq);
|
|
int n;
|
|
|
|
REQUEST_AT_LEAST_SIZE(SELinuxSetContextReq);
|
|
swapl(&stuff->id, n);
|
|
swapl(&stuff->context_len, n);
|
|
return ProcSELinuxSetDeviceContext(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxGetDeviceContext(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxGetContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
swapl(&stuff->id, n);
|
|
return ProcSELinuxGetDeviceContext(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxGetWindowContext(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxGetContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
swapl(&stuff->id, n);
|
|
return ProcSELinuxGetWindowContext(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxGetPropertyContext(ClientPtr client, pointer privKey)
|
|
{
|
|
REQUEST(SELinuxGetPropertyContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetPropertyContextReq);
|
|
swapl(&stuff->window, n);
|
|
swapl(&stuff->property, n);
|
|
return ProcSELinuxGetPropertyContext(client, privKey);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxGetSelectionContext(ClientPtr client, pointer privKey)
|
|
{
|
|
REQUEST(SELinuxGetContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
swapl(&stuff->id, n);
|
|
return ProcSELinuxGetSelectionContext(client, privKey);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxListProperties(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxGetContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
swapl(&stuff->id, n);
|
|
return ProcSELinuxListProperties(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxGetClientContext(ClientPtr client)
|
|
{
|
|
REQUEST(SELinuxGetContextReq);
|
|
int n;
|
|
|
|
REQUEST_SIZE_MATCH(SELinuxGetContextReq);
|
|
swapl(&stuff->id, n);
|
|
return ProcSELinuxGetClientContext(client);
|
|
}
|
|
|
|
static int
|
|
SProcSELinuxDispatch(ClientPtr client)
|
|
{
|
|
REQUEST(xReq);
|
|
int n;
|
|
|
|
swaps(&stuff->length, n);
|
|
|
|
switch (stuff->data) {
|
|
case X_SELinuxQueryVersion:
|
|
return SProcSELinuxQueryVersion(client);
|
|
case X_SELinuxSetDeviceCreateContext:
|
|
return SProcSELinuxSetCreateContext(client, CTX_DEV);
|
|
case X_SELinuxGetDeviceCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_DEV);
|
|
case X_SELinuxSetDeviceContext:
|
|
return SProcSELinuxSetDeviceContext(client);
|
|
case X_SELinuxGetDeviceContext:
|
|
return SProcSELinuxGetDeviceContext(client);
|
|
case X_SELinuxSetWindowCreateContext:
|
|
return SProcSELinuxSetCreateContext(client, CTX_WIN);
|
|
case X_SELinuxGetWindowCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_WIN);
|
|
case X_SELinuxGetWindowContext:
|
|
return SProcSELinuxGetWindowContext(client);
|
|
case X_SELinuxSetPropertyCreateContext:
|
|
return SProcSELinuxSetCreateContext(client, CTX_PRP);
|
|
case X_SELinuxGetPropertyCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_PRP);
|
|
case X_SELinuxSetPropertyUseContext:
|
|
return SProcSELinuxSetCreateContext(client, USE_PRP);
|
|
case X_SELinuxGetPropertyUseContext:
|
|
return ProcSELinuxGetCreateContext(client, USE_PRP);
|
|
case X_SELinuxGetPropertyContext:
|
|
return SProcSELinuxGetPropertyContext(client, objectKey);
|
|
case X_SELinuxGetPropertyDataContext:
|
|
return SProcSELinuxGetPropertyContext(client, dataKey);
|
|
case X_SELinuxListProperties:
|
|
return SProcSELinuxListProperties(client);
|
|
case X_SELinuxSetSelectionCreateContext:
|
|
return SProcSELinuxSetCreateContext(client, CTX_SEL);
|
|
case X_SELinuxGetSelectionCreateContext:
|
|
return ProcSELinuxGetCreateContext(client, CTX_SEL);
|
|
case X_SELinuxSetSelectionUseContext:
|
|
return SProcSELinuxSetCreateContext(client, USE_SEL);
|
|
case X_SELinuxGetSelectionUseContext:
|
|
return ProcSELinuxGetCreateContext(client, USE_SEL);
|
|
case X_SELinuxGetSelectionContext:
|
|
return SProcSELinuxGetSelectionContext(client, objectKey);
|
|
case X_SELinuxGetSelectionDataContext:
|
|
return SProcSELinuxGetSelectionContext(client, dataKey);
|
|
case X_SELinuxListSelections:
|
|
return ProcSELinuxListSelections(client);
|
|
case X_SELinuxGetClientContext:
|
|
return SProcSELinuxGetClientContext(client);
|
|
default:
|
|
return BadRequest;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Extension Setup / Teardown
|
|
*/
|
|
|
|
static void
|
|
SELinuxResetProc(ExtensionEntry *extEntry)
|
|
{
|
|
/* Unregister callbacks */
|
|
DeleteCallback(&ClientStateCallback, SELinuxClientState, NULL);
|
|
DeleteCallback(&ResourceStateCallback, SELinuxResourceState, NULL);
|
|
|
|
XaceDeleteCallback(XACE_EXT_DISPATCH, SELinuxExtension, NULL);
|
|
XaceDeleteCallback(XACE_RESOURCE_ACCESS, SELinuxResource, NULL);
|
|
XaceDeleteCallback(XACE_DEVICE_ACCESS, SELinuxDevice, NULL);
|
|
XaceDeleteCallback(XACE_PROPERTY_ACCESS, SELinuxProperty, NULL);
|
|
XaceDeleteCallback(XACE_SEND_ACCESS, SELinuxSend, NULL);
|
|
XaceDeleteCallback(XACE_RECEIVE_ACCESS, SELinuxReceive, NULL);
|
|
XaceDeleteCallback(XACE_CLIENT_ACCESS, SELinuxClient, NULL);
|
|
XaceDeleteCallback(XACE_EXT_ACCESS, SELinuxExtension, NULL);
|
|
XaceDeleteCallback(XACE_SERVER_ACCESS, SELinuxServer, NULL);
|
|
XaceDeleteCallback(XACE_SELECTION_ACCESS, SELinuxSelection, NULL);
|
|
XaceDeleteCallback(XACE_SCREEN_ACCESS, SELinuxScreen, NULL);
|
|
XaceDeleteCallback(XACE_SCREENSAVER_ACCESS, SELinuxScreen, truep);
|
|
|
|
/* Tear down SELinux stuff */
|
|
selabel_close(label_hnd);
|
|
label_hnd = NULL;
|
|
|
|
audit_close(audit_fd);
|
|
|
|
avc_destroy();
|
|
avc_active = 0;
|
|
|
|
/* Free local state */
|
|
xfree(knownAtoms);
|
|
knownAtoms = NULL;
|
|
numKnownAtoms = 0;
|
|
|
|
xfree(knownEvents);
|
|
knownEvents = NULL;
|
|
numKnownEvents = 0;
|
|
|
|
xfree(knownTypes);
|
|
knownTypes = NULL;
|
|
numKnownTypes = 0;
|
|
}
|
|
|
|
void
|
|
SELinuxExtensionInit(INITARGS)
|
|
{
|
|
ExtensionEntry *extEntry;
|
|
struct selinux_opt selabel_option = { SELABEL_OPT_VALIDATE, (char *)1 };
|
|
struct selinux_opt avc_option = { AVC_OPT_SETENFORCE, (char *)0 };
|
|
security_context_t con;
|
|
int ret = TRUE;
|
|
|
|
/* Check SELinux mode on system */
|
|
if (!is_selinux_enabled()) {
|
|
ErrorF("SELinux: Disabled on system, not enabling in X server\n");
|
|
return;
|
|
}
|
|
|
|
/* Check SELinux mode in configuration file */
|
|
switch(selinuxEnforcingState) {
|
|
case SELINUX_MODE_DISABLED:
|
|
LogMessage(X_INFO, "SELinux: Disabled in configuration file\n");
|
|
return;
|
|
case SELINUX_MODE_ENFORCING:
|
|
LogMessage(X_INFO, "SELinux: Configured in enforcing mode\n");
|
|
avc_option.value = (char *)1;
|
|
break;
|
|
case SELINUX_MODE_PERMISSIVE:
|
|
LogMessage(X_INFO, "SELinux: Configured in permissive mode\n");
|
|
avc_option.value = (char *)0;
|
|
break;
|
|
default:
|
|
avc_option.type = AVC_OPT_UNUSED;
|
|
break;
|
|
}
|
|
|
|
/* Set up SELinux stuff */
|
|
selinux_set_callback(SELINUX_CB_LOG, (union selinux_callback)SELinuxLog);
|
|
selinux_set_callback(SELINUX_CB_AUDIT, (union selinux_callback)SELinuxAudit);
|
|
|
|
if (selinux_set_mapping(map) < 0) {
|
|
if (errno == EINVAL) {
|
|
ErrorF("SELinux: Invalid object class mapping, disabling SELinux support.\n");
|
|
return;
|
|
}
|
|
FatalError("SELinux: Failed to set up security class mapping\n");
|
|
}
|
|
|
|
if (avc_open(&avc_option, 1) < 0)
|
|
FatalError("SELinux: Couldn't initialize SELinux userspace AVC\n");
|
|
avc_active = 1;
|
|
|
|
label_hnd = selabel_open(SELABEL_CTX_X, &selabel_option, 1);
|
|
if (!label_hnd)
|
|
FatalError("SELinux: Failed to open x_contexts mapping in policy\n");
|
|
|
|
if (security_get_initial_context("unlabeled", &con) < 0)
|
|
FatalError("SELinux: Failed to look up unlabeled context\n");
|
|
if (avc_context_to_sid(con, &unlabeled_sid) < 0)
|
|
FatalError("SELinux: a context_to_SID call failed!\n");
|
|
freecon(con);
|
|
|
|
/* Prepare for auditing */
|
|
audit_fd = audit_open();
|
|
if (audit_fd < 0)
|
|
FatalError("SELinux: Failed to open the system audit log\n");
|
|
|
|
/* Allocate private storage */
|
|
if (!dixRequestPrivate(subjectKey, sizeof(SELinuxSubjectRec)) ||
|
|
!dixRequestPrivate(objectKey, sizeof(SELinuxObjectRec)) ||
|
|
!dixRequestPrivate(dataKey, sizeof(SELinuxObjectRec)))
|
|
FatalError("SELinux: Failed to allocate private storage.\n");
|
|
|
|
/* Create atoms for doing window labeling */
|
|
atom_ctx = MakeAtom("_SELINUX_CONTEXT", 16, TRUE);
|
|
if (atom_ctx == BAD_RESOURCE)
|
|
FatalError("SELinux: Failed to create atom\n");
|
|
atom_client_ctx = MakeAtom("_SELINUX_CLIENT_CONTEXT", 23, TRUE);
|
|
if (atom_client_ctx == BAD_RESOURCE)
|
|
FatalError("SELinux: Failed to create atom\n");
|
|
|
|
/* Register callbacks */
|
|
ret &= dixRegisterPrivateInitFunc(subjectKey, SELinuxSubjectInit, NULL);
|
|
ret &= dixRegisterPrivateDeleteFunc(subjectKey, SELinuxSubjectFree, NULL);
|
|
ret &= dixRegisterPrivateInitFunc(objectKey, SELinuxObjectInit, NULL);
|
|
ret &= dixRegisterPrivateDeleteFunc(objectKey, SELinuxObjectFree, NULL);
|
|
ret &= dixRegisterPrivateInitFunc(dataKey, SELinuxObjectInit, NULL);
|
|
ret &= dixRegisterPrivateDeleteFunc(dataKey, SELinuxObjectFree, NULL);
|
|
|
|
ret &= AddCallback(&ClientStateCallback, SELinuxClientState, NULL);
|
|
ret &= AddCallback(&ResourceStateCallback, SELinuxResourceState, NULL);
|
|
|
|
ret &= XaceRegisterCallback(XACE_EXT_DISPATCH, SELinuxExtension, NULL);
|
|
ret &= XaceRegisterCallback(XACE_RESOURCE_ACCESS, SELinuxResource, NULL);
|
|
ret &= XaceRegisterCallback(XACE_DEVICE_ACCESS, SELinuxDevice, NULL);
|
|
ret &= XaceRegisterCallback(XACE_PROPERTY_ACCESS, SELinuxProperty, NULL);
|
|
ret &= XaceRegisterCallback(XACE_SEND_ACCESS, SELinuxSend, NULL);
|
|
ret &= XaceRegisterCallback(XACE_RECEIVE_ACCESS, SELinuxReceive, NULL);
|
|
ret &= XaceRegisterCallback(XACE_CLIENT_ACCESS, SELinuxClient, NULL);
|
|
ret &= XaceRegisterCallback(XACE_EXT_ACCESS, SELinuxExtension, NULL);
|
|
ret &= XaceRegisterCallback(XACE_SERVER_ACCESS, SELinuxServer, NULL);
|
|
ret &= XaceRegisterCallback(XACE_SELECTION_ACCESS, SELinuxSelection, NULL);
|
|
ret &= XaceRegisterCallback(XACE_SCREEN_ACCESS, SELinuxScreen, NULL);
|
|
ret &= XaceRegisterCallback(XACE_SCREENSAVER_ACCESS, SELinuxScreen, truep);
|
|
if (!ret)
|
|
FatalError("SELinux: Failed to register one or more callbacks\n");
|
|
|
|
/* Add extension to server */
|
|
extEntry = AddExtension(SELINUX_EXTENSION_NAME,
|
|
SELinuxNumberEvents, SELinuxNumberErrors,
|
|
ProcSELinuxDispatch, SProcSELinuxDispatch,
|
|
SELinuxResetProc, StandardMinorOpcode);
|
|
|
|
AddExtensionAlias("Flask", extEntry);
|
|
|
|
/* Label objects that were created before we could register ourself */
|
|
SELinuxLabelInitial();
|
|
}
|