xserver git update 15/5/2010

1 files changed, 938 insertions, 981 deletions

diff --git a/xorg-server/Xext/xselinux_hooks.c b/xorg-server/Xext/xselinux_hooks.c
index 6c8c8cdbe..6075a34e8 100644
--- a/xorg-server/Xext/xselinux_hooks.c
+++ b/xorg-server/Xext/xselinux_hooks.c
@@ -1,981 +1,938 @@
-/************************************************************
-
-Author: Eamon Walsh <ewalsh@tycho.nsa.gov>
-
-Permission to use, copy, modify, distribute, and sell this software and its
-documentation for any purpose is hereby granted without fee, provided that
-this permission notice appear in supporting documentation.  This permission
-notice shall be included in all copies or substantial portions of the
-Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
-AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-********************************************************/
-
-/*
- * Portions of this code copyright (c) 2005 by Trusted Computer Solutions, Inc.
- * All rights reserved.
- */
-
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include <sys/socket.h>
-#include <stdio.h>
-#include <stdarg.h>
-
-#include <libaudit.h>
-
-#include <X11/Xatom.h>
-#include "selection.h"
-#include "inputstr.h"
-#include "scrnintstr.h"
-#include "windowstr.h"
-#include "propertyst.h"
-#include "extnsionst.h"
-#include "xacestr.h"
-#include "../os/osdep.h"
-#define _XSELINUX_NEED_FLASK_MAP
-#include "xselinuxint.h"
-
-
-/* structure passed to auditing callback */
-typedef struct {
-    ClientPtr client;	/* client */
-    DeviceIntPtr dev;	/* device */
-    char *command;	/* client's executable path */
-    unsigned id;	/* resource id, if any */
-    int restype;	/* resource type, if any */
-    int event;		/* event type, if any */
-    Atom property;	/* property name, if any */
-    Atom selection;	/* selection name, if any */
-    char *extension;	/* extension name, if any */
-} SELinuxAuditRec;
-
-/* private state keys */
-static int subjectKeyIndex;
-DevPrivateKey subjectKey = &subjectKeyIndex;
-static int objectKeyIndex;
-DevPrivateKey objectKey = &objectKeyIndex;
-static int dataKeyIndex;
-DevPrivateKey dataKey = &dataKeyIndex;
-
-/* audit file descriptor */
-static int audit_fd;
-
-/* atoms for window label properties */
-static Atom atom_ctx;
-static Atom atom_client_ctx;
-
-/* The unlabeled SID */
-static security_id_t unlabeled_sid;
-
-/* forward declarations */
-static void SELinuxScreen(CallbackListPtr *, pointer, pointer);
-
-/* "true" pointer value for use as callback data */
-static pointer truep = (pointer)1;
-
-
-/*
- * Performs an SELinux permission check.
- */
-static int
-SELinuxDoCheck(SELinuxSubjectRec *subj, SELinuxObjectRec *obj,
-	       security_class_t class, Mask mode, SELinuxAuditRec *auditdata)
-{
-    /* serverClient requests OK */
-    if (subj->privileged)
-	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)
-{
-    int fd = XaceGetConnectionNumber(client);
-    SELinuxSubjectRec *subj;
-    SELinuxObjectRec *obj;
-    security_context_t ctx;
-
-    subj = dixLookupPrivate(&client->devPrivates, subjectKey);
-    obj = dixLookupPrivate(&client->devPrivates, objectKey);
-
-    /* Try to get a context from the socket */
-    if (fd < 0 || getpeercon_raw(fd, &ctx) < 0) {
-	/* Otherwise, fall back to a default context */
-	ctx = SELinuxDefaultClientLabel();
-    }
-
-    /* For local clients, try and determine the executable name */
-    if (XaceIsLocal(client)) {
-	struct ucred creds;
-	socklen_t len = sizeof(creds);
-	char path[PATH_MAX + 1];
-	size_t bytes;
-
-	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;
-    }
-
-finish:
-    /* Get a SID from the context */
-    if (avc_context_to_sid_raw(ctx, &subj->sid) < 0)
-	FatalError("SELinux: client %d: context_to_sid_raw(%s) failed\n",
-		   client->index, ctx);
-
-    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;
-
-    /* Use the context of the X server process for the serverClient */
-    if (getcon_raw(&ctx) < 0)
-	FatalError("SELinux: couldn't get context of X server process\n");
-
-    /* Get a SID from the context */
-    if (avc_context_to_sid_raw(ctx, &subj->sid) < 0)
-	FatalError("SELinux: serverClient: context_to_sid(%s) failed\n", ctx);
-
-    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 */
-	dixLookupResourceByType(&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 & RC_DRAWABLE && subj->win_create_sid) {
-	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];
-    const char *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;
-
-    switch (type) {
-    case SELINUX_INFO:
-	aut = AUDIT_USER_MAC_POLICY_LOAD;
-	break;
-    case SELINUX_AVC:
-	aut = AUDIT_USER_AVC;
-	break;
-    default:
-	aut = AUDIT_USER_SELINUX_ERR;
-	break;
-    }
-
-    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 };
-    security_class_t cls;
-    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);
-
-	if (subj->dev_create_sid) {
-	    /* Label the device with the create context */
-	    obj->sid = subj->dev_create_sid;
-	    dsubj->sid = subj->dev_create_sid;
-	} else {
-	    /* Label the device directly with the process SID */
-	    obj->sid = subj->sid;
-	    dsubj->sid = subj->sid;
-	}
-    }
-
-    cls = IsPointerDevice(rec->dev) ? SECCLASS_X_POINTER : SECCLASS_X_KEYBOARD;
-    rc = SELinuxDoCheck(subj, obj, cls, 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) {
-	security_id_t sid;
-
-	serv = dixLookupPrivate(&serverClient->devPrivates, subjectKey);
-	rc = SELinuxExtensionToSID(rec->ext->name, &sid);
-	if (rc != Success) {
-	    rec->status = rc;
-	    return;
-	}
-
-	/* 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");
-	    rec->status = BadValue;
-	    return;
-	}
-    }
-
-    /* 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) {
-	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);
-	}
-
-	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);
-	if (subj->sel_create_sid)
-	    data->sid = subj->sel_create_sid;
-	else
-	    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;
-
-    /* Don't care about the new content check */
-    if (rec->access_mode & DixPostAccess)
-	return;
-
-    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) {
-	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);
-	}
-
-	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);
-	if (subj->prp_create_sid)
-	    data->sid = subj->prp_create_sid;
-	else
-	    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) {
-	/* 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;
-    if (rec->state != ResourceStateAdding)
-	return;
-
-    pWin = (WindowPtr)rec->value;
-    subj = dixLookupPrivate(&wClient(pWin)->devPrivates, subjectKey);
-
-    if (subj->sid) {
-	security_context_t ctx;
-	int rc = avc_sid_to_context_raw(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_raw(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;
-
-    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);
-}
-
-static void
-SELinuxObjectInit(CallbackListPtr *pcbl, pointer unused, pointer calldata)
-{
-    PrivateCallbackRec *rec = calldata;
-    SELinuxObjectRec *obj = *rec->value;
-
-    obj->sid = unlabeled_sid;
-}
-
-static int netlink_fd;
-
-static void
-SELinuxBlockHandler(void *data, struct timeval **tv, void *read_mask)
-{
-}
-
-static void
-SELinuxWakeupHandler(void *data, int err, void *read_mask)
-{
-    if (FD_ISSET(netlink_fd, (fd_set *)read_mask))
-        avc_netlink_check_nb();
-}
-
-void
-SELinuxFlaskReset(void)
-{
-    /* 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 */
-    audit_close(audit_fd);
-    avc_netlink_release_fd();
-    RemoveBlockAndWakeupHandlers(SELinuxBlockHandler, SELinuxWakeupHandler,
-                                 NULL);
-    RemoveGeneralSocket(netlink_fd);
-
-    avc_destroy();
-}
-
-void
-SELinuxFlaskInit(void)
-{
-    struct selinux_opt avc_option = { AVC_OPT_SETENFORCE, (char *)0 };
-    security_context_t ctx;
-    int ret = TRUE;
-
-    switch(selinuxEnforcingState) {
-    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");
-
-    if (security_get_initial_context_raw("unlabeled", &ctx) < 0)
-	FatalError("SELinux: Failed to look up unlabeled context\n");
-    if (avc_context_to_sid_raw(ctx, &unlabeled_sid) < 0)
-	FatalError("SELinux: a context_to_SID call failed!\n");
-    freecon(ctx);
-
-    /* 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");
-
-    netlink_fd = avc_netlink_acquire_fd();
-    AddGeneralSocket(netlink_fd);
-    RegisterBlockAndWakeupHandlers(SELinuxBlockHandler, SELinuxWakeupHandler,
-                                   NULL);
-
-    /* Register callbacks */
-    ret &= dixRegisterPrivateInitFunc(subjectKey, SELinuxSubjectInit, NULL);
-    ret &= dixRegisterPrivateDeleteFunc(subjectKey, SELinuxSubjectFree, NULL);
-    ret &= dixRegisterPrivateInitFunc(objectKey, SELinuxObjectInit, NULL);
-    ret &= dixRegisterPrivateInitFunc(dataKey, SELinuxObjectInit, 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");
-
-    /* Label objects that were created before we could register ourself */
-    SELinuxLabelInitial();
-}
+/************************************************************

+

+Author: Eamon Walsh <ewalsh@tycho.nsa.gov>

+

+Permission to use, copy, modify, distribute, and sell this software and its

+documentation for any purpose is hereby granted without fee, provided that

+this permission notice appear in supporting documentation.  This permission

+notice shall be included in all copies or substantial portions of the

+Software.

+

+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

+AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+

+********************************************************/

+

+/*

+ * Portions of this code copyright (c) 2005 by Trusted Computer Solutions, Inc.

+ * All rights reserved.

+ */

+

+#ifdef HAVE_DIX_CONFIG_H

+#include <dix-config.h>

+#endif

+

+#include <sys/socket.h>

+#include <stdio.h>

+#include <stdarg.h>

+

+#include <libaudit.h>

+

+#include <X11/Xatom.h>

+#include "selection.h"

+#include "inputstr.h"

+#include "scrnintstr.h"

+#include "windowstr.h"

+#include "propertyst.h"

+#include "extnsionst.h"

+#include "xacestr.h"

+#include "../os/osdep.h"

+#define _XSELINUX_NEED_FLASK_MAP

+#include "xselinuxint.h"

+

+

+/* structure passed to auditing callback */

+typedef struct {

+    ClientPtr client;	/* client */

+    DeviceIntPtr dev;	/* device */

+    char *command;	/* client's executable path */

+    unsigned id;	/* resource id, if any */

+    int restype;	/* resource type, if any */

+    int event;		/* event type, if any */

+    Atom property;	/* property name, if any */

+    Atom selection;	/* selection name, if any */

+    char *extension;	/* extension name, if any */

+} SELinuxAuditRec;

+

+/* private state keys */

+static int subjectKeyIndex;

+DevPrivateKey subjectKey = &subjectKeyIndex;

+static int objectKeyIndex;

+DevPrivateKey objectKey = &objectKeyIndex;

+static int dataKeyIndex;

+DevPrivateKey dataKey = &dataKeyIndex;

+

+/* audit file descriptor */

+static int audit_fd;

+

+/* atoms for window label properties */

+static Atom atom_ctx;

+static Atom atom_client_ctx;

+

+/* The unlabeled SID */

+static security_id_t unlabeled_sid;

+

+/* forward declarations */

+static void SELinuxScreen(CallbackListPtr *, pointer, pointer);

+

+/* "true" pointer value for use as callback data */

+static pointer truep = (pointer)1;

+

+

+/*

+ * Performs an SELinux permission check.

+ */

+static int

+SELinuxDoCheck(SELinuxSubjectRec *subj, SELinuxObjectRec *obj,

+	       security_class_t class, Mask mode, SELinuxAuditRec *auditdata)

+{

+    /* serverClient requests OK */

+    if (subj->privileged)

+	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)

+{

+    int fd = XaceGetConnectionNumber(client);

+    SELinuxSubjectRec *subj;

+    SELinuxObjectRec *obj;

+    security_context_t ctx;

+

+    subj = dixLookupPrivate(&client->devPrivates, subjectKey);

+    obj = dixLookupPrivate(&client->devPrivates, objectKey);

+

+    /* Try to get a context from the socket */

+    if (fd < 0 || getpeercon_raw(fd, &ctx) < 0) {

+	/* Otherwise, fall back to a default context */

+	ctx = SELinuxDefaultClientLabel();

+    }

+

+    /* For local clients, try and determine the executable name */

+    if (XaceIsLocal(client)) {

+	struct ucred creds;

+	socklen_t len = sizeof(creds);

+	char path[PATH_MAX + 1];

+	size_t bytes;

+

+	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;

+

+	strncpy(subj->command, path, COMMAND_LEN - 1);

+    }

+

+finish:

+    /* Get a SID from the context */

+    if (avc_context_to_sid_raw(ctx, &subj->sid) < 0)

+	FatalError("SELinux: client %d: context_to_sid_raw(%s) failed\n",

+		   client->index, ctx);

+

+    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;

+

+    /* Use the context of the X server process for the serverClient */

+    if (getcon_raw(&ctx) < 0)

+	FatalError("SELinux: couldn't get context of X server process\n");

+

+    /* Get a SID from the context */

+    if (avc_context_to_sid_raw(ctx, &subj->sid) < 0)

+	FatalError("SELinux: serverClient: context_to_sid(%s) failed\n", ctx);

+

+    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 */

+	dixLookupResourceByType(&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 & RC_DRAWABLE && subj->win_create_sid) {

+	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];

+    const char *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;

+

+    switch (type) {

+    case SELINUX_INFO:

+	aut = AUDIT_USER_MAC_POLICY_LOAD;

+	break;

+    case SELINUX_AVC:

+	aut = AUDIT_USER_AVC;

+	break;

+    default:

+	aut = AUDIT_USER_SELINUX_ERR;

+	break;

+    }

+

+    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 };

+    security_class_t cls;

+    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);

+

+	if (subj->dev_create_sid) {

+	    /* Label the device with the create context */

+	    obj->sid = subj->dev_create_sid;

+	    dsubj->sid = subj->dev_create_sid;

+	} else {

+	    /* Label the device directly with the process SID */

+	    obj->sid = subj->sid;

+	    dsubj->sid = subj->sid;

+	}

+    }

+

+    cls = IsPointerDevice(rec->dev) ? SECCLASS_X_POINTER : SECCLASS_X_KEYBOARD;

+    rc = SELinuxDoCheck(subj, obj, cls, 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 == NULL) {

+	security_id_t sid;

+

+	serv = dixLookupPrivate(&serverClient->devPrivates, subjectKey);

+	rc = SELinuxExtensionToSID(rec->ext->name, &sid);

+	if (rc != Success) {

+	    rec->status = rc;

+	    return;

+	}

+

+	/* 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");

+	    rec->status = BadValue;

+	    return;

+	}

+    }

+

+    /* 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) {

+	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);

+	}

+

+	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);

+	if (subj->sel_create_sid)

+	    data->sid = subj->sel_create_sid;

+	else

+	    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;

+

+    /* Don't care about the new content check */

+    if (rec->access_mode & DixPostAccess)

+	return;

+

+    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) {

+	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);

+	}

+

+	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);

+	if (subj->prp_create_sid)

+	    data->sid = subj->prp_create_sid;

+	else

+	    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) {

+	/* 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;

+    if (rec->state != ResourceStateAdding)

+	return;

+

+    pWin = (WindowPtr)rec->value;

+    subj = dixLookupPrivate(&wClient(pWin)->devPrivates, subjectKey);

+

+    if (subj->sid) {

+	security_context_t ctx;

+	int rc = avc_sid_to_context_raw(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_raw(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");

+}

+

+

+static int netlink_fd;

+

+static void

+SELinuxBlockHandler(void *data, struct timeval **tv, void *read_mask)

+{

+}

+

+static void

+SELinuxWakeupHandler(void *data, int err, void *read_mask)

+{

+    if (FD_ISSET(netlink_fd, (fd_set *)read_mask))

+        avc_netlink_check_nb();

+}

+

+void

+SELinuxFlaskReset(void)

+{

+    /* 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 */

+    audit_close(audit_fd);

+    avc_netlink_release_fd();

+    RemoveBlockAndWakeupHandlers(SELinuxBlockHandler, SELinuxWakeupHandler,

+                                 NULL);

+    RemoveGeneralSocket(netlink_fd);

+

+    avc_destroy();

+}

+

+void

+SELinuxFlaskInit(void)

+{

+    struct selinux_opt avc_option = { AVC_OPT_SETENFORCE, (char *)0 };

+    security_context_t ctx;

+    int ret = TRUE;

+

+    switch(selinuxEnforcingState) {

+    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");

+

+    if (security_get_initial_context_raw("unlabeled", &ctx) < 0)

+	FatalError("SELinux: Failed to look up unlabeled context\n");

+    if (avc_context_to_sid_raw(ctx, &unlabeled_sid) < 0)

+	FatalError("SELinux: a context_to_SID call failed!\n");

+    freecon(ctx);

+

+    /* 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");

+

+    netlink_fd = avc_netlink_acquire_fd();

+    AddGeneralSocket(netlink_fd);

+    RegisterBlockAndWakeupHandlers(SELinuxBlockHandler, SELinuxWakeupHandler,

+                                   NULL);

+

+    /* Register callbacks */

+    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");

+

+    /* Label objects that were created before we could register ourself */

+    SELinuxLabelInitial();

+}