--- /dev/null
+/* $XConsortium: security.c /main/13 1996/12/15 21:24:27 rws $ */
+/*
+Copyright (c) 1996 X Consortium, Inc.
+
+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 X CONSORTIUM 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 OF
+OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of the X Consortium shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from the X Consortium.
+*/
+/* $XFree86: xc/programs/Xserver/Xext/security.c,v 1.2 1997/01/27 06:57:17 dawes Exp $ */
+
+#include "dixstruct.h"
+#include "extnsionst.h"
+#include "windowstr.h"
+#include "inputstr.h"
+#include "gcstruct.h"
+#include "colormapst.h"
+#include "propertyst.h"
+#define _SECURITY_SERVER
+#include "securstr.h"
+#include <assert.h>
+#include <stdarg.h>
+#ifdef LBX
+#define _XLBX_SERVER_
+#include "XLbx.h"
+extern unsigned char LbxReqCode;
+#endif
+#ifdef XAPPGROUP
+#include "Xagsrv.h"
+#endif
+#include <stdio.h> /* for file reading operations */
+#include "Xatom.h" /* for XA_STRING */
+
+#ifndef DEFAULTPOLICYFILE
+# define DEFAULTPOLICYFILE NULL
+#endif
+#ifdef WIN32
+#include <X11/Xos.h>
+#undef index
+#endif
+
+static int SecurityErrorBase; /* first Security error number */
+static int SecurityEventBase; /* first Security event number */
+
+CallbackListPtr SecurityValidateGroupCallback = NULL; /* see security.h */
+
+RESTYPE SecurityAuthorizationResType; /* resource type for authorizations */
+
+static RESTYPE RTEventClient;
+
+/* Proc vectors for untrusted clients, swapped and unswapped versions.
+ * These are the same as the normal proc vectors except that extensions
+ * that haven't declared themselves secure will have ProcBadRequest plugged
+ * in for their major opcode dispatcher. This prevents untrusted clients
+ * from guessing extension major opcodes and using the extension even though
+ * the extension can't be listed or queried.
+ */
+int (*UntrustedProcVector[256])(
+#if NeedNestedPrototypes
+ ClientPtr /*client*/
+#endif
+);
+int (*SwappedUntrustedProcVector[256])(
+#if NeedNestedPrototypes
+ ClientPtr /*client*/
+#endif
+);
+
+extern int ProcBadRequest();
+
+
+/* SecurityAudit
+ *
+ * Arguments:
+ * format is the formatting string to be used to interpret the
+ * remaining arguments.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * Writes the message to the log file if security logging is on.
+ */
+
+void
+SecurityAudit(char *format, ...)
+{
+ va_list args;
+
+ if (auditTrailLevel < SECURITY_AUDIT_LEVEL)
+ return;
+ AuditPrefix(format);
+ va_start(args, format);
+ VErrorF(format, args);
+ va_end(args);
+} /* SecurityAudit */
+
+#define rClient(obj) (clients[CLIENT_ID((obj)->resource)])
+
+/* SecurityDeleteAuthorization
+ *
+ * Arguments:
+ * value is the authorization to delete.
+ * id is its resource ID.
+ *
+ * Returns: Success.
+ *
+ * Side Effects:
+ * Frees everything associated with the authorization.
+ */
+
+static int
+SecurityDeleteAuthorization(value, id)
+ pointer value;
+ XID id;
+{
+ SecurityAuthorizationPtr pAuth = (SecurityAuthorizationPtr)value;
+ unsigned short name_len, data_len;
+ char *name, *data;
+ int status;
+ int i;
+ OtherClientsPtr pEventClient;
+
+ /* Remove the auth using the os layer auth manager */
+
+ status = AuthorizationFromID(pAuth->id, &name_len, &name,
+ &data_len, &data);
+ assert(status);
+ status = RemoveAuthorization(name_len, name, data_len, data);
+ assert(status);
+
+ /* free the auth timer if there is one */
+
+ if (pAuth->timer) TimerFree(pAuth->timer);
+
+ /* send revoke events */
+
+ while (pEventClient = pAuth->eventClients)
+ {
+ /* send revocation event event */
+ ClientPtr client = rClient(pEventClient);
+
+ if (!client->clientGone)
+ {
+ xSecurityAuthorizationRevokedEvent are;
+ are.type = SecurityEventBase + XSecurityAuthorizationRevoked;
+ are.sequenceNumber = client->sequence;
+ are.authId = pAuth->id;
+ WriteEventsToClient(client, 1, (xEvent *)&are);
+ }
+ FreeResource(pEventClient->resource, RT_NONE);
+ }
+
+ /* kill all clients using this auth */
+
+ for (i = 1; i<currentMaxClients; i++)
+ {
+ if (clients[i] && (clients[i]->authId == pAuth->id))
+ CloseDownClient(clients[i]);
+ }
+
+ SecurityAudit("revoked authorization ID %d\n", pAuth->id);
+ xfree(pAuth);
+ return Success;
+
+} /* SecurityDeleteAuthorization */
+
+
+/* resource delete function for RTEventClient */
+static int
+SecurityDeleteAuthorizationEventClient(value, id)
+ pointer value;
+ XID id;
+{
+ OtherClientsPtr pEventClient, prev = NULL;
+ SecurityAuthorizationPtr pAuth = (SecurityAuthorizationPtr)value;
+
+ for (pEventClient = pAuth->eventClients;
+ pEventClient;
+ pEventClient = pEventClient->next)
+ {
+ if (pEventClient->resource == id)
+ {
+ if (prev)
+ prev->next = pEventClient->next;
+ else
+ pAuth->eventClients = pEventClient->next;
+ xfree(pEventClient);
+ return(Success);
+ }
+ prev = pEventClient;
+ }
+ /*NOTREACHED*/
+ return -1; /* make compiler happy */
+} /* SecurityDeleteAuthorizationEventClient */
+
+
+/* SecurityComputeAuthorizationTimeout
+ *
+ * Arguments:
+ * pAuth is the authorization for which we are computing the timeout
+ * seconds is the number of seconds we want to wait
+ *
+ * Returns:
+ * the number of milliseconds that the auth timer should be set to
+ *
+ * Side Effects:
+ * Sets pAuth->secondsRemaining to any "overflow" amount of time
+ * that didn't fit in 32 bits worth of milliseconds
+ */
+
+static CARD32
+SecurityComputeAuthorizationTimeout(pAuth, seconds)
+ SecurityAuthorizationPtr pAuth;
+ unsigned int seconds;
+{
+ /* maxSecs is the number of full seconds that can be expressed in
+ * 32 bits worth of milliseconds
+ */
+ CARD32 maxSecs = (CARD32)(~0) / (CARD32)MILLI_PER_SECOND;
+
+ if (seconds > maxSecs)
+ { /* only come here if we want to wait more than 49 days */
+ pAuth->secondsRemaining = seconds - maxSecs;
+ return maxSecs * MILLI_PER_SECOND;
+ }
+ else
+ { /* by far the common case */
+ pAuth->secondsRemaining = 0;
+ return seconds * MILLI_PER_SECOND;
+ }
+} /* SecurityStartAuthorizationTimer */
+
+/* SecurityAuthorizationExpired
+ *
+ * This function is passed as an argument to TimerSet and gets called from
+ * the timer manager in the os layer when its time is up.
+ *
+ * Arguments:
+ * timer is the timer for this authorization.
+ * time is the current time.
+ * pval is the authorization whose time is up.
+ *
+ * Returns:
+ * A new time delay in milliseconds if the timer should wait some
+ * more, else zero.
+ *
+ * Side Effects:
+ * Frees the authorization resource if the timeout period is really
+ * over, otherwise recomputes pAuth->secondsRemaining.
+ */
+
+static CARD32
+SecurityAuthorizationExpired(timer, time, pval)
+ OsTimerPtr timer;
+ CARD32 time;
+ pointer pval;
+{
+ SecurityAuthorizationPtr pAuth = (SecurityAuthorizationPtr)pval;
+
+ assert(pAuth->timer == timer);
+
+ if (pAuth->secondsRemaining)
+ {
+ return SecurityComputeAuthorizationTimeout(pAuth,
+ pAuth->secondsRemaining);
+ }
+ else
+ {
+ FreeResource(pAuth->id, RT_NONE);
+ return 0;
+ }
+} /* SecurityAuthorizationExpired */
+
+/* SecurityStartAuthorizationTimer
+ *
+ * Arguments:
+ * pAuth is the authorization whose timer should be started.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * A timer is started, set to expire after the timeout period for
+ * this authorization. When it expires, the function
+ * SecurityAuthorizationExpired will be called.
+ */
+
+static void
+SecurityStartAuthorizationTimer(pAuth)
+ SecurityAuthorizationPtr pAuth;
+{
+ pAuth->timer = TimerSet(pAuth->timer, 0,
+ SecurityComputeAuthorizationTimeout(pAuth, pAuth->timeout),
+ SecurityAuthorizationExpired, pAuth);
+} /* SecurityStartAuthorizationTimer */
+
+
+/* Proc functions all take a client argument, execute the request in
+ * client->requestBuffer, and return a protocol error status.
+ */
+
+static int
+ProcSecurityQueryVersion(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityQueryVersionReq);
+ xSecurityQueryVersionReply rep;
+
+ /* paranoia: this "can't happen" because this extension is hidden
+ * from untrusted clients, but just in case...
+ */
+ if (client->trustLevel != XSecurityClientTrusted)
+ return BadRequest;
+
+ REQUEST_SIZE_MATCH(xSecurityQueryVersionReq);
+ rep.type = X_Reply;
+ rep.sequenceNumber = client->sequence;
+ rep.length = 0;
+ rep.majorVersion = SECURITY_MAJOR_VERSION;
+ rep.minorVersion = SECURITY_MINOR_VERSION;
+ if(client->swapped)
+ {
+ register char n;
+ swaps(&rep.sequenceNumber, n);
+ swaps(&rep.majorVersion, n);
+ swaps(&rep.minorVersion, n);
+ }
+ (void)WriteToClient(client, SIZEOF(xSecurityQueryVersionReply),
+ (char *)&rep);
+ return (client->noClientException);
+} /* ProcSecurityQueryVersion */
+
+
+static int
+SecurityEventSelectForAuthorization(pAuth, client, mask)
+ SecurityAuthorizationPtr pAuth;
+ ClientPtr client;
+ Mask mask;
+{
+ OtherClients *pEventClient;
+
+ for (pEventClient = pAuth->eventClients;
+ pEventClient;
+ pEventClient = pEventClient->next)
+ {
+ if (SameClient(pEventClient, client))
+ {
+ if (mask == 0)
+ FreeResource(pEventClient->resource, RT_NONE);
+ else
+ pEventClient->mask = mask;
+ return Success;
+ }
+ }
+
+ pEventClient = (OtherClients *) xalloc(sizeof(OtherClients));
+ if (!pEventClient)
+ return BadAlloc;
+ pEventClient->mask = mask;
+ pEventClient->resource = FakeClientID(client->index);
+ pEventClient->next = pAuth->eventClients;
+ if (!AddResource(pEventClient->resource, RTEventClient,
+ (pointer)pAuth))
+ {
+ xfree(pEventClient);
+ return BadAlloc;
+ }
+ pAuth->eventClients = pEventClient;
+
+ return Success;
+} /* SecurityEventSelectForAuthorization */
+
+
+static int
+ProcSecurityGenerateAuthorization(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityGenerateAuthorizationReq);
+ int len; /* request length in CARD32s*/
+ Bool removeAuth = FALSE; /* if bailout, call RemoveAuthorization? */
+ SecurityAuthorizationPtr pAuth = NULL; /* auth we are creating */
+ int err; /* error to return from this function */
+ int status; /* return value from os functions */
+ XID authId; /* authorization ID assigned by os layer */
+ xSecurityGenerateAuthorizationReply rep; /* reply struct */
+ unsigned int trustLevel; /* trust level of new auth */
+ XID group; /* group of new auth */
+ CARD32 timeout; /* timeout of new auth */
+ CARD32 *values; /* list of supplied attributes */
+ char *protoname; /* auth proto name sent in request */
+ char *protodata; /* auth proto data sent in request */
+ unsigned int authdata_len; /* # bytes of generated auth data */
+ char *pAuthdata; /* generated auth data */
+ Mask eventMask; /* what events on this auth does client want */
+
+ /* paranoia: this "can't happen" because this extension is hidden
+ * from untrusted clients, but just in case...
+ */
+ if (client->trustLevel != XSecurityClientTrusted)
+ return BadRequest;
+
+ /* check request length */
+
+ REQUEST_AT_LEAST_SIZE(xSecurityGenerateAuthorizationReq);
+ len = SIZEOF(xSecurityGenerateAuthorizationReq) >> 2;
+ len += (stuff->nbytesAuthProto + (unsigned)3) >> 2;
+ len += (stuff->nbytesAuthData + (unsigned)3) >> 2;
+ values = ((CARD32 *)stuff) + len;
+ len += Ones(stuff->valueMask);
+ if (client->req_len != len)
+ return BadLength;
+
+ /* check valuemask */
+ if (stuff->valueMask & ~XSecurityAllAuthorizationAttributes)
+ {
+ client->errorValue = stuff->valueMask;
+ return BadValue;
+ }
+
+ /* check timeout */
+ timeout = 60;
+ if (stuff->valueMask & XSecurityTimeout)
+ {
+ timeout = *values++;
+ }
+
+ /* check trustLevel */
+ trustLevel = XSecurityClientUntrusted;
+ if (stuff->valueMask & XSecurityTrustLevel)
+ {
+ trustLevel = *values++;
+ if (trustLevel != XSecurityClientTrusted &&
+ trustLevel != XSecurityClientUntrusted)
+ {
+ client->errorValue = trustLevel;
+ return BadValue;
+ }
+ }
+
+ /* check group */
+ group = None;
+ if (stuff->valueMask & XSecurityGroup)
+ {
+ group = *values++;
+ if (SecurityValidateGroupCallback)
+ {
+ SecurityValidateGroupInfoRec vgi;
+ vgi.group = group;
+ vgi.valid = FALSE;
+ CallCallbacks(&SecurityValidateGroupCallback, (pointer)&vgi);
+
+ /* if nobody said they recognized it, it's an error */
+
+ if (!vgi.valid)
+ {
+ client->errorValue = group;
+ return BadValue;
+ }
+ }
+ }
+
+ /* check event mask */
+ eventMask = 0;
+ if (stuff->valueMask & XSecurityEventMask)
+ {
+ eventMask = *values++;
+ if (eventMask & ~XSecurityAllEventMasks)
+ {
+ client->errorValue = eventMask;
+ return BadValue;
+ }
+ }
+
+ protoname = (char *)&stuff[1];
+ protodata = protoname + ((stuff->nbytesAuthProto + (unsigned)3) >> 2);
+
+ /* call os layer to generate the authorization */
+
+ authId = GenerateAuthorization(stuff->nbytesAuthProto, protoname,
+ stuff->nbytesAuthData, protodata,
+ &authdata_len, &pAuthdata);
+ if ((XID) ~0L == authId)
+ {
+ err = SecurityErrorBase + XSecurityBadAuthorizationProtocol;
+ goto bailout;
+ }
+
+ /* now that we've added the auth, remember to remove it if we have to
+ * abort the request for some reason (like allocation failure)
+ */
+ removeAuth = TRUE;
+
+ /* associate additional information with this auth ID */
+
+ pAuth = (SecurityAuthorizationPtr)xalloc(sizeof(SecurityAuthorizationRec));
+ if (!pAuth)
+ {
+ err = BadAlloc;
+ goto bailout;
+ }
+
+ /* fill in the auth fields */
+
+ pAuth->id = authId;
+ pAuth->timeout = timeout;
+ pAuth->group = group;
+ pAuth->trustLevel = trustLevel;
+ pAuth->refcnt = 0; /* the auth was just created; nobody's using it yet */
+ pAuth->secondsRemaining = 0;
+ pAuth->timer = NULL;
+ pAuth->eventClients = NULL;
+
+ /* handle event selection */
+ if (eventMask)
+ {
+ err = SecurityEventSelectForAuthorization(pAuth, client, eventMask);
+ if (err != Success)
+ goto bailout;
+ }
+
+ if (!AddResource(authId, SecurityAuthorizationResType, pAuth))
+ {
+ err = BadAlloc;
+ goto bailout;
+ }
+
+ /* start the timer ticking */
+
+ if (pAuth->timeout != 0)
+ SecurityStartAuthorizationTimer(pAuth);
+
+ /* tell client the auth id and data */
+
+ rep.type = X_Reply;
+ rep.length = (authdata_len + 3) >> 2;
+ rep.sequenceNumber = client->sequence;
+ rep.authId = authId;
+ rep.dataLength = authdata_len;
+
+ if (client->swapped)
+ {
+ register char n;
+ swapl(&rep.length, n);
+ swaps(&rep.sequenceNumber, n);
+ swapl(&rep.authId, n);
+ swaps(&rep.dataLength, n);
+ }
+
+ WriteToClient(client, SIZEOF(xSecurityGenerateAuthorizationReply),
+ (char *)&rep);
+ WriteToClient(client, authdata_len, pAuthdata);
+
+ SecurityAudit("client %d generated authorization %d trust %d timeout %d group %d events %d\n",
+ client->index, pAuth->id, pAuth->trustLevel, pAuth->timeout,
+ pAuth->group, eventMask);
+
+ /* the request succeeded; don't call RemoveAuthorization or free pAuth */
+
+ removeAuth = FALSE;
+ pAuth = NULL;
+ err = client->noClientException;
+
+bailout:
+ if (removeAuth)
+ RemoveAuthorization(stuff->nbytesAuthProto, protoname,
+ authdata_len, pAuthdata);
+ if (pAuth) xfree(pAuth);
+ return err;
+
+} /* ProcSecurityGenerateAuthorization */
+
+static int
+ProcSecurityRevokeAuthorization(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityRevokeAuthorizationReq);
+ SecurityAuthorizationPtr pAuth;
+
+ /* paranoia: this "can't happen" because this extension is hidden
+ * from untrusted clients, but just in case...
+ */
+ if (client->trustLevel != XSecurityClientTrusted)
+ return BadRequest;
+
+ REQUEST_SIZE_MATCH(xSecurityRevokeAuthorizationReq);
+
+ pAuth = (SecurityAuthorizationPtr)SecurityLookupIDByType(client,
+ stuff->authId, SecurityAuthorizationResType, SecurityDestroyAccess);
+ if (!pAuth)
+ return SecurityErrorBase + XSecurityBadAuthorization;
+
+ FreeResource(stuff->authId, RT_NONE);
+ return Success;
+} /* ProcSecurityRevokeAuthorization */
+
+
+static int
+ProcSecurityDispatch(client)
+ ClientPtr client;
+{
+ REQUEST(xReq);
+
+ switch (stuff->data)
+ {
+ case X_SecurityQueryVersion:
+ return ProcSecurityQueryVersion(client);
+ case X_SecurityGenerateAuthorization:
+ return ProcSecurityGenerateAuthorization(client);
+ case X_SecurityRevokeAuthorization:
+ return ProcSecurityRevokeAuthorization(client);
+ default:
+ return BadRequest;
+ }
+} /* ProcSecurityDispatch */
+
+static int
+SProcSecurityQueryVersion(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityQueryVersionReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH(xSecurityQueryVersionReq);
+ swaps(&stuff->majorVersion, n);
+ swaps(&stuff->minorVersion,n);
+ return ProcSecurityQueryVersion(client);
+} /* SProcSecurityQueryVersion */
+
+
+static int
+SProcSecurityGenerateAuthorization(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityGenerateAuthorizationReq);
+ register char n;
+ CARD32 *values;
+ unsigned long nvalues;
+
+ swaps(&stuff->length, n);
+ REQUEST_AT_LEAST_SIZE(xSecurityGenerateAuthorizationReq);
+ swaps(&stuff->nbytesAuthProto, n);
+ swaps(&stuff->nbytesAuthData, n);
+ swapl(&stuff->valueMask, n);
+ values = (CARD32 *)(&stuff[1]) +
+ ((stuff->nbytesAuthProto + (unsigned)3) >> 2) +
+ ((stuff->nbytesAuthData + (unsigned)3) >> 2);
+ nvalues = (((CARD32 *)stuff) + stuff->length) - values;
+ SwapLongs(values, nvalues);
+ return ProcSecurityGenerateAuthorization(client);
+} /* SProcSecurityGenerateAuthorization */
+
+
+static int
+SProcSecurityRevokeAuthorization(client)
+ ClientPtr client;
+{
+ REQUEST(xSecurityRevokeAuthorizationReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH(xSecurityRevokeAuthorizationReq);
+ swapl(&stuff->authId, n);
+ return ProcSecurityRevokeAuthorization(client);
+} /* SProcSecurityRevokeAuthorization */
+
+
+static int
+SProcSecurityDispatch(client)
+ ClientPtr client;
+{
+ REQUEST(xReq);
+
+ switch (stuff->data)
+ {
+ case X_SecurityQueryVersion:
+ return SProcSecurityQueryVersion(client);
+ case X_SecurityGenerateAuthorization:
+ return SProcSecurityGenerateAuthorization(client);
+ case X_SecurityRevokeAuthorization:
+ return SProcSecurityRevokeAuthorization(client);
+ default:
+ return BadRequest;
+ }
+} /* SProcSecurityDispatch */
+
+static void
+SwapSecurityAuthorizationRevokedEvent(from, to)
+ xSecurityAuthorizationRevokedEvent *from, *to;
+{
+ to->type = from->type;
+ to->detail = from->detail;
+ cpswaps(from->sequenceNumber, to->sequenceNumber);
+ cpswapl(from->authId, to->authId);
+}
+
+/* SecurityDetermineEventPropogationLimits
+ *
+ * This is a helper function for SecurityCheckDeviceAccess.
+ *
+ * Arguments:
+ * dev is the device for which the starting and stopping windows for
+ * event propogation should be determined.
+ * The values pointed to by ppWin and ppStopWin are not used.
+ *
+ * Returns:
+ * ppWin is filled in with a pointer to the window at which event
+ * propogation for the given device should start given the current
+ * state of the server (pointer position, window layout, etc.)
+ * ppStopWin is filled in with the window at which event propogation
+ * should stop; events should not go to ppStopWin.
+ *
+ * Side Effects: none.
+ */
+
+static void
+SecurityDetermineEventPropogationLimits(dev, ppWin, ppStopWin)
+ DeviceIntPtr dev;
+ WindowPtr *ppWin;
+ WindowPtr *ppStopWin;
+{
+ WindowPtr pFocusWin = dev->focus ? dev->focus->win : NoneWin;
+
+ if (pFocusWin == NoneWin)
+ { /* no focus -- events don't go anywhere */
+ *ppWin = *ppStopWin = NULL;
+ return;
+ }
+
+ if (pFocusWin == PointerRootWin)
+ { /* focus follows the pointer */
+ *ppWin = GetSpriteWindow();
+ *ppStopWin = NULL; /* propogate all the way to the root */
+ }
+ else
+ { /* a real window is set for the focus */
+ WindowPtr pSpriteWin = GetSpriteWindow();
+ *ppStopWin = pFocusWin->parent; /* don't go past the focus window */
+
+ /* if the pointer is in a subwindow of the focus window, start
+ * at that subwindow, else start at the focus window itself
+ */
+ if (IsParent(pFocusWin, pSpriteWin))
+ *ppWin = pSpriteWin;
+ else *ppWin = pFocusWin;
+ }
+} /* SecurityDetermineEventPropogationLimits */
+
+
+/* SecurityCheckDeviceAccess
+ *
+ * Arguments:
+ * client is the client attempting to access a device.
+ * dev is the device being accessed.
+ * fromRequest is TRUE if the device access is a direct result of
+ * the client executing some request and FALSE if it is a
+ * result of the server trying to send an event (e.g. KeymapNotify)
+ * to the client.
+ * Returns:
+ * TRUE if the device access should be allowed, else FALSE.
+ *
+ * Side Effects:
+ * An audit message is generated if access is denied.
+ */
+
+Bool
+SecurityCheckDeviceAccess(client, dev, fromRequest)
+ ClientPtr client;
+ DeviceIntPtr dev;
+ Bool fromRequest;
+{
+ WindowPtr pWin, pStopWin;
+ Bool untrusted_got_event;
+ Bool found_event_window;
+ Mask eventmask;
+ int reqtype;
+
+ /* trusted clients always allowed to do anything */
+ if (client->trustLevel == XSecurityClientTrusted)
+ return TRUE;
+
+ /* device security other than keyboard is not implemented yet */
+ if (dev != inputInfo.keyboard)
+ return TRUE;
+
+ /* some untrusted client wants access */
+
+ if (fromRequest)
+ {
+ reqtype = ((xReq *)client->requestBuffer)->reqType;
+ switch (reqtype)
+ {
+ /* never allow these */
+ case X_ChangeKeyboardMapping:
+ case X_ChangeKeyboardControl:
+ case X_SetModifierMapping:
+ SecurityAudit("client %d attempted request %d\n",
+ client->index, reqtype);
+ return FALSE;
+ default:
+ break;
+ }
+ }
+
+ untrusted_got_event = FALSE;
+ found_event_window = FALSE;
+
+ if (dev->grab)
+ {
+ untrusted_got_event =
+ ((rClient(dev->grab))->trustLevel != XSecurityClientTrusted);
+ }
+ else
+ {
+ SecurityDetermineEventPropogationLimits(dev, &pWin, &pStopWin);
+
+ eventmask = KeyPressMask | KeyReleaseMask;
+ while ( (pWin != pStopWin) && !found_event_window)
+ {
+ OtherClients *other;
+
+ if (pWin->eventMask & eventmask)
+ {
+ found_event_window = TRUE;
+ client = wClient(pWin);
+ if (client->trustLevel != XSecurityClientTrusted)
+ {
+ untrusted_got_event = TRUE;
+ }
+ }
+ if (wOtherEventMasks(pWin) & eventmask)
+ {
+ found_event_window = TRUE;
+ for (other = wOtherClients(pWin); other; other = other->next)
+ {
+ if (other->mask & eventmask)
+ {
+ client = rClient(other);
+ if (client->trustLevel != XSecurityClientTrusted)
+ {
+ untrusted_got_event = TRUE;
+ break;
+ }
+ }
+ }
+ }
+ if (wDontPropagateMask(pWin) & eventmask)
+ break;
+ pWin = pWin->parent;
+ } /* while propogating the event */
+ }
+
+ /* allow access by untrusted clients only if an event would have gone
+ * to an untrusted client
+ */
+
+ if (!untrusted_got_event)
+ {
+ char *devname = dev->name;
+ if (!devname) devname = "unnamed";
+ if (fromRequest)
+ SecurityAudit("client %d attempted request %d device %d (%s)\n",
+ client->index, reqtype, dev->id, devname);
+ else
+ SecurityAudit("client %d attempted to access device %d (%s)\n",
+ client->index, dev->id, devname);
+ }
+ return untrusted_got_event;
+} /* SecurityCheckDeviceAccess */
+
+
+
+/* SecurityAuditResourceIDAccess
+ *
+ * Arguments:
+ * client is the client doing the resource access.
+ * id is the resource id.
+ *
+ * Returns: NULL
+ *
+ * Side Effects:
+ * An audit message is generated with details of the denied
+ * resource access.
+ */
+
+static pointer
+SecurityAuditResourceIDAccess(client, id)
+ ClientPtr client;
+ XID id;
+{
+ int cid = CLIENT_ID(id);
+ int reqtype = ((xReq *)client->requestBuffer)->reqType;
+ switch (reqtype)
+ {
+ case X_ChangeProperty:
+ case X_DeleteProperty:
+ case X_GetProperty:
+ {
+ xChangePropertyReq *req =
+ (xChangePropertyReq *)client->requestBuffer;
+ int propertyatom = req->property;
+ char *propertyname = NameForAtom(propertyatom);
+
+ SecurityAudit("client %d attempted request %d with window 0x%x property %s of client %d\n",
+ client->index, reqtype, id, propertyname, cid);
+ break;
+ }
+ default:
+ {
+ SecurityAudit("client %d attempted request %d with resource 0x%x of client %d\n",
+ client->index, reqtype, id, cid);
+ break;
+ }
+ }
+ return NULL;
+} /* SecurityAuditResourceIDAccess */
+
+
+/* SecurityCheckResourceIDAccess
+ *
+ * This function gets plugged into client->CheckAccess and is called from
+ * SecurityLookupIDByType/Class to determine if the client can access the
+ * resource.
+ *
+ * Arguments:
+ * client is the client doing the resource access.
+ * id is the resource id.
+ * rtype is its type or class.
+ * access_mode represents the intended use of the resource; see
+ * resource.h.
+ * rval is a pointer to the resource structure for this resource.
+ *
+ * Returns:
+ * If access is granted, the value of rval that was passed in, else NULL.
+ *
+ * Side Effects:
+ * Disallowed resource accesses are audited.
+ */
+
+static pointer
+SecurityCheckResourceIDAccess(client, id, rtype, access_mode, rval)
+ ClientPtr client;
+ XID id;
+ RESTYPE rtype;
+ Mask access_mode;
+ pointer rval;
+{
+ int cid = CLIENT_ID(id);
+ int reqtype = ((xReq *)client->requestBuffer)->reqType;
+
+ if (SecurityUnknownAccess == access_mode)
+ return rval; /* for compatibility, we have to allow access */
+
+ switch (reqtype)
+ { /* these are always allowed */
+ case X_QueryTree:
+ case X_TranslateCoords:
+ case X_GetGeometry:
+ /* property access is controlled in SecurityCheckPropertyAccess */
+ case X_GetProperty:
+ case X_ChangeProperty:
+ case X_DeleteProperty:
+ case X_RotateProperties:
+ case X_ListProperties:
+ return rval;
+ default:
+ break;
+ }
+
+ if (cid != 0)
+ { /* not a server-owned resource */
+ /*
+ * The following 'if' restricts clients to only access resources at
+ * the same trustLevel. Since there are currently only two trust levels,
+ * and trusted clients never call this function, this degenerates into
+ * saying that untrusted clients can only access resources of other
+ * untrusted clients. One way to add the notion of groups would be to
+ * allow values other than Trusted (0) and Untrusted (1) for this field.
+ * Clients at the same trust level would be able to use each other's
+ * resources, but not those of clients at other trust levels. I haven't
+ * tried it, but this probably mostly works already. The obvious
+ * competing alternative for grouping clients for security purposes is to
+ * use app groups. dpw
+ */
+ if (client->trustLevel == clients[cid]->trustLevel
+#ifdef XAPPGROUP
+ || (RT_COLORMAP == rtype &&
+ XagDefaultColormap (client) == (Colormap) id)
+#endif
+ )
+ return rval;
+ else
+ return SecurityAuditResourceIDAccess(client, id);
+ }
+ else /* server-owned resource - probably a default colormap or root window */
+ {
+ if (RT_WINDOW == rtype || RC_DRAWABLE == rtype)
+ {
+ switch (reqtype)
+ { /* the following operations are allowed on root windows */
+ case X_CreatePixmap:
+ case X_CreateGC:
+ case X_CreateWindow:
+ case X_CreateColormap:
+ case X_ListProperties:
+ case X_GrabPointer:
+ case X_UngrabButton:
+ case X_QueryBestSize:
+ case X_GetWindowAttributes:
+ break;
+ case X_SendEvent:
+ { /* see if it is an event specified by the ICCCM */
+ xSendEventReq *req = (xSendEventReq *)
+ (client->requestBuffer);
+ if (req->propagate == xTrue
+ ||
+ (req->eventMask != ColormapChangeMask &&
+ req->eventMask != StructureNotifyMask &&
+ req->eventMask !=
+ (SubstructureRedirectMask|SubstructureNotifyMask)
+ )
+ ||
+ (req->event.u.u.type != UnmapNotify &&
+ req->event.u.u.type != ConfigureRequest &&
+ req->event.u.u.type != ClientMessage
+ )
+ )
+ { /* not an ICCCM event */
+ return SecurityAuditResourceIDAccess(client, id);
+ }
+ break;
+ } /* case X_SendEvent on root */
+
+ case X_ChangeWindowAttributes:
+ { /* Allow selection of PropertyNotify and StructureNotify
+ * events on the root.
+ */
+ xChangeWindowAttributesReq *req =
+ (xChangeWindowAttributesReq *)(client->requestBuffer);
+ if (req->valueMask == CWEventMask)
+ {
+ CARD32 value = *((CARD32 *)(req + 1));
+ if ( (value &
+ ~(PropertyChangeMask|StructureNotifyMask)) == 0)
+ break;
+ }
+ return SecurityAuditResourceIDAccess(client, id);
+ } /* case X_ChangeWindowAttributes on root */
+
+ default:
+ {
+#ifdef LBX
+ /* XXX really need per extension dispatching */
+ if (reqtype == LbxReqCode) {
+ switch (((xReq *)client->requestBuffer)->data) {
+ case X_LbxGetProperty:
+ case X_LbxChangeProperty:
+ return rval;
+ default:
+ break;
+ }
+ }
+#endif
+ /* others not allowed */
+ return SecurityAuditResourceIDAccess(client, id);
+ }
+ }
+ } /* end server-owned window or drawable */
+ else if (SecurityAuthorizationResType == rtype)
+ {
+ SecurityAuthorizationPtr pAuth = (SecurityAuthorizationPtr)rval;
+ if (pAuth->trustLevel != client->trustLevel)
+ return SecurityAuditResourceIDAccess(client, id);
+ }
+ else if (RT_COLORMAP != rtype)
+ { /* don't allow anything else besides colormaps */
+ return SecurityAuditResourceIDAccess(client, id);
+ }
+ }
+ return rval;
+} /* SecurityCheckResourceIDAccess */
+
+
+/* SecurityClientStateCallback
+ *
+ * Arguments:
+ * pcbl is &ClientStateCallback.
+ * nullata is NULL.
+ * calldata is a pointer to a NewClientInfoRec (include/dixstruct.h)
+ * which contains information about client state changes.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ *
+ * If a new client is connecting, its authorization ID is copied to
+ * client->authID. If this is a generated authorization, its reference
+ * count is bumped, its timer is cancelled if it was running, and its
+ * trustlevel is copied to client->trustLevel.
+ *
+ * If a client is disconnecting and the client was using a generated
+ * authorization, the authorization's reference count is decremented, and
+ * if it is now zero, the timer for this authorization is started.
+ */
+
+static void
+SecurityClientStateCallback(pcbl, nulldata, calldata)
+ CallbackListPtr *pcbl;
+ pointer nulldata;
+ pointer calldata;
+{
+ NewClientInfoRec *pci = (NewClientInfoRec *)calldata;
+ ClientPtr client = pci->client;
+
+ switch (client->clientState)
+ {
+ case ClientStateRunning:
+ {
+ XID authId = AuthorizationIDOfClient(client);
+ SecurityAuthorizationPtr pAuth;
+
+ client->authId = authId;
+ pAuth = (SecurityAuthorizationPtr)LookupIDByType(authId,
+ SecurityAuthorizationResType);
+ if (pAuth)
+ { /* it is a generated authorization */
+ pAuth->refcnt++;
+ if (pAuth->refcnt == 1)
+ {
+ if (pAuth->timer) TimerCancel(pAuth->timer);
+ }
+ client->trustLevel = pAuth->trustLevel;
+ if (client->trustLevel != XSecurityClientTrusted)
+ {
+ client->CheckAccess = SecurityCheckResourceIDAccess;
+ client->requestVector = client->swapped ?
+ SwappedUntrustedProcVector : UntrustedProcVector;
+ }
+ }
+ break;
+ }
+ case ClientStateGone:
+ case ClientStateRetained: /* client disconnected */
+ {
+ XID authId = client->authId;
+ SecurityAuthorizationPtr pAuth;
+
+ pAuth = (SecurityAuthorizationPtr)LookupIDByType(authId,
+ SecurityAuthorizationResType);
+ if (pAuth)
+ { /* it is a generated authorization */
+ pAuth->refcnt--;
+ if (pAuth->refcnt == 0)
+ {
+ SecurityStartAuthorizationTimer(pAuth);
+ }
+ }
+ break;
+ }
+ default: break;
+ }
+} /* SecurityClientStateCallback */
+
+#ifdef LBX
+Bool
+SecuritySameLevel(client, authId)
+ ClientPtr client;
+ XID authId;
+{
+ SecurityAuthorizationPtr pAuth;
+
+ pAuth = (SecurityAuthorizationPtr)LookupIDByType(authId,
+ SecurityAuthorizationResType);
+ if (pAuth)
+ return client->trustLevel == pAuth->trustLevel;
+ return client->trustLevel == XSecurityClientTrusted;
+}
+#endif
+
+/* SecurityCensorImage
+ *
+ * Called after pScreen->GetImage to prevent pieces or trusted windows from
+ * being returned in image data from an untrusted window.
+ *
+ * Arguments:
+ * client is the client doing the GetImage.
+ * pVisibleRegion is the visible region of the window.
+ * widthBytesLine is the width in bytes of one horizontal line in pBuf.
+ * pDraw is the source window.
+ * x, y, w, h is the rectangle of image data from pDraw in pBuf.
+ * format is the format of the image data in pBuf: ZPixmap or XYPixmap.
+ * pBuf is the image data.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * Any part of the rectangle (x, y, w, h) that is outside the visible
+ * region of the window will be destroyed (overwritten) in pBuf.
+ */
+void
+SecurityCensorImage(client, pVisibleRegion, widthBytesLine, pDraw, x, y, w, h,
+ format, pBuf)
+ ClientPtr client;
+ RegionPtr pVisibleRegion;
+ long widthBytesLine;
+ DrawablePtr pDraw;
+ int x, y, w, h;
+ unsigned int format;
+ char * pBuf;
+{
+ RegionRec imageRegion; /* region representing x,y,w,h */
+ RegionRec censorRegion; /* region to obliterate */
+ BoxRec imageBox;
+ int nRects;
+
+ imageBox.x1 = x;
+ imageBox.y1 = y;
+ imageBox.x2 = x + w;
+ imageBox.y2 = y + h;
+ REGION_INIT(pScreen, &imageRegion, &imageBox, 1);
+ REGION_INIT(pScreen, &censorRegion, NullBox, 0);
+
+ /* censorRegion = imageRegion - visibleRegion */
+ REGION_SUBTRACT(pScreen, &censorRegion, &imageRegion, pVisibleRegion);
+ nRects = REGION_NUM_RECTS(&censorRegion);
+ if (nRects > 0)
+ { /* we have something to censor */
+ GCPtr pScratchGC = NULL;
+ PixmapPtr pPix = NULL;
+ xRectangle *pRects = NULL;
+ Bool failed = FALSE;
+ int depth = 1;
+ int bitsPerPixel = 1;
+ int i;
+ BoxPtr pBox;
+
+ /* convert region to list-of-rectangles for PolyFillRect */
+
+ pRects = (xRectangle *)ALLOCATE_LOCAL(nRects * sizeof(xRectangle *));
+ if (!pRects)
+ {
+ failed = TRUE;
+ goto failSafe;
+ }
+ for (pBox = REGION_RECTS(&censorRegion), i = 0;
+ i < nRects;
+ i++, pBox++)
+ {
+ pRects[i].x = pBox->x1;
+ pRects[i].y = pBox->y1 - imageBox.y1;
+ pRects[i].width = pBox->x2 - pBox->x1;
+ pRects[i].height = pBox->y2 - pBox->y1;
+ }
+
+ /* use pBuf as a fake pixmap */
+
+ if (format == ZPixmap)
+ {
+ depth = pDraw->depth;
+ bitsPerPixel = pDraw->bitsPerPixel;
+ }
+
+ pPix = GetScratchPixmapHeader(pDraw->pScreen, w, h,
+ depth, bitsPerPixel,
+ widthBytesLine, (pointer)pBuf);
+ if (!pPix)
+ {
+ failed = TRUE;
+ goto failSafe;
+ }
+
+ pScratchGC = GetScratchGC(depth, pPix->drawable.pScreen);
+ if (!pScratchGC)
+ {
+ failed = TRUE;
+ goto failSafe;
+ }
+
+ ValidateGC(&pPix->drawable, pScratchGC);
+ (* pScratchGC->ops->PolyFillRect)(&pPix->drawable,
+ pScratchGC, nRects, pRects);
+
+ failSafe:
+ if (failed)
+ {
+ /* Censoring was not completed above. To be safe, wipe out
+ * all the image data so that nothing trusted gets out.
+ */
+ bzero(pBuf, (int)(widthBytesLine * h));
+ }
+ if (pRects) DEALLOCATE_LOCAL(pRects);
+ if (pScratchGC) FreeScratchGC(pScratchGC);
+ if (pPix) FreeScratchPixmapHeader(pPix);
+ }
+ REGION_UNINIT(pScreen, &imageRegion);
+ REGION_UNINIT(pScreen, &censorRegion);
+} /* SecurityCensorImage */
+
+/**********************************************************************/
+
+typedef struct _PropertyAccessRec {
+ ATOM name;
+ ATOM mustHaveProperty;
+ char *mustHaveValue;
+ char windowRestriction;
+#define SecurityAnyWindow 0
+#define SecurityRootWindow 1
+#define SecurityWindowWithProperty 2
+ char readAction;
+ char writeAction;
+ char destroyAction;
+ struct _PropertyAccessRec *next;
+} PropertyAccessRec, *PropertyAccessPtr;
+
+static PropertyAccessPtr PropertyAccessList = NULL;
+static char SecurityDefaultAction = SecurityErrorOperation;
+static char *SecurityPolicyFile = DEFAULTPOLICYFILE;
+static ATOM SecurityMaxPropertyName = 0;
+
+static char *SecurityKeywords[] = {
+#define SecurityKeywordComment 0
+ "#",
+#define SecurityKeywordProperty 1
+ "property",
+#define SecurityKeywordSitePolicy 2
+ "sitepolicy",
+#define SecurityKeywordRoot 3
+ "root",
+#define SecurityKeywordAny 4
+ "any"
+};
+
+#define NUMKEYWORDS (sizeof(SecurityKeywords) / sizeof(char *))
+
+#undef PROPDEBUG
+/*#define PROPDEBUG 1*/
+
+static void
+SecurityFreePropertyAccessList()
+{
+ while (PropertyAccessList)
+ {
+ PropertyAccessPtr freeit = PropertyAccessList;
+ PropertyAccessList = PropertyAccessList->next;
+ xfree(freeit);
+ }
+} /* SecurityFreePropertyAccessList */
+
+#ifndef __EMX__
+#define SecurityIsWhitespace(c) ( (c == ' ') || (c == '\t') || (c == '\n') )
+#else
+#define SecurityIsWhitespace(c) ( (c == ' ') || (c == '\t') || (c == '\n') || (c == '\r') )
+#endif
+
+static char *
+SecuritySkipWhitespace(p)
+ char *p;
+{
+ while (SecurityIsWhitespace(*p))
+ p++;
+ return p;
+} /* SecuritySkipWhitespace */
+
+
+static char *
+SecurityParseString(rest)
+ char **rest;
+{
+ char *startOfString;
+ char *s = *rest;
+ char endChar = 0;
+
+ s = SecuritySkipWhitespace(s);
+
+ if (*s == '"' || *s == '\'')
+ {
+ endChar = *s++;
+ startOfString = s;
+ while (*s && (*s != endChar))
+ s++;
+ }
+ else
+ {
+ startOfString = s;
+ while (*s && !SecurityIsWhitespace(*s))
+ s++;
+ }
+ if (*s)
+ {
+ *s = '\0';
+ *rest = s + 1;
+ return startOfString;
+ }
+ else
+ {
+ *rest = s;
+ return (endChar) ? NULL : startOfString;
+ }
+} /* SecurityParseString */
+
+
+static int
+SecurityParseKeyword(p)
+ char **p;
+{
+ int i;
+ char *s = *p;
+ s = SecuritySkipWhitespace(s);
+ for (i = 0; i < NUMKEYWORDS; i++)
+ {
+ int len = strlen(SecurityKeywords[i]);
+ if (strncmp(s, SecurityKeywords[i], len) == 0)
+ {
+ *p = s + len;
+ return (i);
+ }
+ }
+ *p = s;
+ return -1;
+} /* SecurityParseKeyword */
+
+
+static Bool
+SecurityParsePropertyAccessRule(p)
+ char *p;
+{
+ char *propname;
+ char c;
+ char action = SecurityDefaultAction;
+ char readAction, writeAction, destroyAction;
+ PropertyAccessPtr pacl, prev, cur;
+ ATOM atom;
+ char *mustHaveProperty = NULL;
+ char *mustHaveValue = NULL;
+ Bool invalid;
+ char windowRestriction;
+ int size;
+ int keyword;
+
+ /* get property name */
+ propname = SecurityParseString(&p);
+ if (!propname || (strlen(propname) == 0))
+ return FALSE;
+
+ /* get window on which property must reside for rule to apply */
+
+ keyword = SecurityParseKeyword(&p);
+ if (keyword == SecurityKeywordRoot)
+ windowRestriction = SecurityRootWindow;
+ else if (keyword == SecurityKeywordAny)
+ windowRestriction = SecurityAnyWindow;
+ else /* not root or any, must be a property name */
+ {
+ mustHaveProperty = SecurityParseString(&p);
+ if (!mustHaveProperty || (strlen(mustHaveProperty) == 0))
+ return FALSE;
+ windowRestriction = SecurityWindowWithProperty;
+ p = SecuritySkipWhitespace(p);
+ if (*p == '=')
+ { /* property value is specified too */
+ p++; /* skip over '=' */
+ mustHaveValue = SecurityParseString(&p);
+ if (!mustHaveValue)
+ return FALSE;
+ }
+ }
+
+ /* get operations and actions */
+
+ invalid = FALSE;
+ readAction = writeAction = destroyAction = SecurityDefaultAction;
+ while ( (c = *p++) && !invalid)
+ {
+ switch (c)
+ {
+ case 'i': action = SecurityIgnoreOperation; break;
+ case 'a': action = SecurityAllowOperation; break;
+ case 'e': action = SecurityErrorOperation; break;
+
+ case 'r': readAction = action; break;
+ case 'w': writeAction = action; break;
+ case 'd': destroyAction = action; break;
+
+ default :
+ if (!SecurityIsWhitespace(c))
+ invalid = TRUE;
+ break;
+ }
+ }
+ if (invalid)
+ return FALSE;
+
+ /* We've successfully collected all the information needed for this
+ * property access rule. Now record it in a PropertyAccessRec.
+ */
+ size = sizeof(PropertyAccessRec);
+
+ /* If there is a property value string, allocate space for it
+ * right after the PropertyAccessRec.
+ */
+ if (mustHaveValue)
+ size += strlen(mustHaveValue) + 1;
+ pacl = (PropertyAccessPtr)Xalloc(size);
+ if (!pacl)
+ return FALSE;
+
+ pacl->name = MakeAtom(propname, strlen(propname), TRUE);
+ if (pacl->name == BAD_RESOURCE)
+ {
+ Xfree(pacl);
+ return FALSE;
+ }
+ if (mustHaveProperty)
+ {
+ pacl->mustHaveProperty = MakeAtom(mustHaveProperty,
+ strlen(mustHaveProperty), TRUE);
+ if (pacl->mustHaveProperty == BAD_RESOURCE)
+ {
+ Xfree(pacl);
+ return FALSE;
+ }
+ }
+ else
+ pacl->mustHaveProperty = 0;
+
+ if (mustHaveValue)
+ {
+ pacl->mustHaveValue = (char *)(pacl + 1);
+ strcpy(pacl->mustHaveValue, mustHaveValue);
+ }
+ else
+ pacl->mustHaveValue = NULL;
+
+ SecurityMaxPropertyName = max(SecurityMaxPropertyName, pacl->name);
+
+ pacl->windowRestriction = windowRestriction;
+ pacl->readAction = readAction;
+ pacl->writeAction = writeAction;
+ pacl->destroyAction = destroyAction;
+
+ /* link the new rule into the list of rules in order of increasing
+ * property name (atom) value to make searching easier
+ */
+
+ for (prev = NULL, cur = PropertyAccessList;
+ cur && cur->name <= pacl->name;
+ prev = cur, cur = cur->next)
+ ;
+ if (!prev)
+ {
+ pacl->next = cur;
+ PropertyAccessList = pacl;
+ }
+ else
+ {
+ prev->next = pacl;
+ pacl->next = cur;
+ }
+ return TRUE;
+} /* SecurityParsePropertyAccessRule */
+
+static char **SecurityPolicyStrings = NULL;
+static int nSecurityPolicyStrings = 0;
+
+static Bool
+SecurityParseSitePolicy(p)
+ char *p;
+{
+ char *policyStr = SecurityParseString(&p);
+ char *copyPolicyStr;
+ char **newStrings;
+
+ if (!policyStr)
+ return FALSE;
+
+ copyPolicyStr = (char *)Xalloc(strlen(policyStr) + 1);
+ if (!copyPolicyStr)
+ return TRUE;
+ strcpy(copyPolicyStr, policyStr);
+ newStrings = (char **)Xrealloc(SecurityPolicyStrings,
+ sizeof (char *) * (nSecurityPolicyStrings + 1));
+ if (!newStrings)
+ {
+ Xfree(copyPolicyStr);
+ return TRUE;
+ }
+
+ SecurityPolicyStrings = newStrings;
+ SecurityPolicyStrings[nSecurityPolicyStrings++] = copyPolicyStr;
+
+} /* SecurityParseSitePolicy */
+
+
+char **
+SecurityGetSitePolicyStrings(n)
+ int *n;
+{
+ *n = nSecurityPolicyStrings;
+ return SecurityPolicyStrings;
+} /* SecurityGetSitePolicyStrings */
+
+static void
+SecurityFreeSitePolicyStrings()
+{
+ if (SecurityPolicyStrings)
+ {
+ assert(nSecurityPolicyStrings);
+ while (nSecurityPolicyStrings--)
+ {
+ Xfree(SecurityPolicyStrings[nSecurityPolicyStrings]);
+ }
+ Xfree(SecurityPolicyStrings);
+ SecurityPolicyStrings = NULL;
+ nSecurityPolicyStrings = 0;
+ }
+} /* SecurityFreeSitePolicyStrings */
+
+
+static void
+SecurityLoadPropertyAccessList()
+{
+ FILE *f;
+ int lineNumber = 0;
+
+ SecurityMaxPropertyName = 0;
+
+ if (!SecurityPolicyFile)
+ return;
+
+#ifndef __EMX__
+ f = fopen(SecurityPolicyFile, "r");
+#else
+ f = fopen((char*)__XOS2RedirRoot(SecurityPolicyFile), "r");
+#endif
+ if (!f)
+ {
+ ErrorF("error opening security policy file %s\n",
+ SecurityPolicyFile);
+ return;
+ }
+
+ while (!feof(f))
+ {
+ char buf[200];
+ Bool validLine;
+ char *p;
+
+ if (!(p = fgets(buf, sizeof(buf), f)))
+ break;
+ lineNumber++;
+
+ /* if first line, check version number */
+ if (lineNumber == 1)
+ {
+ char *v = SecurityParseString(&p);
+ if (strcmp(v, SECURITY_POLICY_FILE_VERSION) != 0)
+ {
+ ErrorF("%s: invalid security policy file version, ignoring file\n",
+ SecurityPolicyFile);
+ break;
+ }
+ validLine = TRUE;
+ }
+ else
+ {
+ switch (SecurityParseKeyword(&p))
+ {
+ case SecurityKeywordComment:
+ validLine = TRUE;
+ break;
+
+ case SecurityKeywordProperty:
+ validLine = SecurityParsePropertyAccessRule(p);
+ break;
+
+ case SecurityKeywordSitePolicy:
+ validLine = SecurityParseSitePolicy(p);
+ break;
+
+ default:
+ validLine = (*p == '\0'); /* blank lines OK, others not */
+ break;
+ }
+ }
+
+ if (!validLine)
+ ErrorF("Line %d of %s invalid, ignoring\n",
+ lineNumber, SecurityPolicyFile);
+ } /* end while more input */
+
+#ifdef PROPDEBUG
+ {
+ PropertyAccessPtr pacl;
+ char *op = "aie";
+ for (pacl = PropertyAccessList; pacl; pacl = pacl->next)
+ {
+ ErrorF("property %s ", NameForAtom(pacl->name));
+ switch (pacl->windowRestriction)
+ {
+ case SecurityAnyWindow: ErrorF("any "); break;
+ case SecurityRootWindow: ErrorF("root "); break;
+ case SecurityWindowWithProperty:
+ {
+ ErrorF("%s ", NameForAtom(pacl->mustHaveProperty));
+ if (pacl->mustHaveValue)
+ ErrorF(" = \"%s\" ", pacl->mustHaveValue);
+
+ }
+ break;
+ }
+ ErrorF("%cr %cw %cd\n", op[pacl->readAction],
+ op[pacl->writeAction], op[pacl->destroyAction]);
+ }
+ }
+#endif /* PROPDEBUG */
+
+ fclose(f);
+} /* SecurityLoadPropertyAccessList */
+
+
+static Bool
+SecurityMatchString(ws, cs)
+ char *ws;
+ char *cs;
+{
+ while (*ws && *cs)
+ {
+ if (*ws == '*')
+ {
+ Bool match = FALSE;
+ ws++;
+ while (!(match = SecurityMatchString(ws, cs)) && *cs)
+ {
+ cs++;
+ }
+ return match;
+ }
+ else if (*ws == *cs)
+ {
+ ws++;
+ cs++;
+ }
+ else break;
+ }
+ return ( ( (*ws == '\0') || ((*ws == '*') && *(ws+1) == '\0') )
+ && (*cs == '\0') );
+} /* SecurityMatchString */
+
+#ifdef PROPDEBUG
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+
+
+char
+SecurityCheckPropertyAccess(client, pWin, propertyName, access_mode)
+ ClientPtr client;
+ WindowPtr pWin;
+ ATOM propertyName;
+ Mask access_mode;
+{
+ PropertyAccessPtr pacl;
+ char action = SecurityDefaultAction;
+
+ /* if client trusted or window untrusted, allow operation */
+
+ if ( (client->trustLevel == XSecurityClientTrusted) ||
+ (wClient(pWin)->trustLevel != XSecurityClientTrusted) )
+ return SecurityAllowOperation;
+
+#ifdef PROPDEBUG
+ /* For testing, it's more convenient if the property rules file gets
+ * reloaded whenever it changes, so we can rapidly try things without
+ * having to reset the server.
+ */
+ {
+ struct stat buf;
+ static time_t lastmod = 0;
+ int ret = stat(SecurityPolicyFile , &buf);
+ if ( (ret == 0) && (buf.st_mtime > lastmod) )
+ {
+ ErrorF("reloading property rules\n");
+ SecurityFreePropertyAccessList();
+ SecurityLoadPropertyAccessList();
+ lastmod = buf.st_mtime;
+ }
+ }
+#endif
+
+ /* If the property atom is bigger than any atoms on the list,
+ * we know we won't find it, so don't even bother looking.
+ */
+ if (propertyName <= SecurityMaxPropertyName)
+ {
+ /* untrusted client operating on trusted window; see if it's allowed */
+
+ for (pacl = PropertyAccessList; pacl; pacl = pacl->next)
+ {
+ if (pacl->name < propertyName)
+ continue;
+ if (pacl->name > propertyName)
+ break;
+
+ /* pacl->name == propertyName, so see if it applies to this window */
+
+ switch (pacl->windowRestriction)
+ {
+ case SecurityAnyWindow: /* always applies */
+ break;
+
+ case SecurityRootWindow:
+ {
+ /* if not a root window, this rule doesn't apply */
+ if (pWin->parent)
+ continue;
+ }
+ break;
+
+ case SecurityWindowWithProperty:
+ {
+ PropertyPtr pProp = wUserProps (pWin);
+ Bool match = FALSE;
+ char *p;
+ char *pEndData;
+
+ while (pProp)
+ {
+ if (pProp->propertyName == pacl->mustHaveProperty)
+ break;
+ pProp = pProp->next;
+ }
+ if (!pProp)
+ continue;
+ if (!pacl->mustHaveValue)
+ break;
+ if (pProp->type != XA_STRING || pProp->format != 8)
+ continue;
+
+ p = pProp->data;
+ pEndData = ((char *)pProp->data) + pProp->size;
+ while (!match && p < pEndData)
+ {
+ if (SecurityMatchString(pacl->mustHaveValue, p))
+ match = TRUE;
+ else
+ { /* skip to the next string */
+ while (*p++ && p < pEndData)
+ ;
+ }
+ }
+ if (!match)
+ continue;
+ }
+ break; /* end case SecurityWindowWithProperty */
+ } /* end switch on windowRestriction */
+
+ /* If we get here, the property access rule pacl applies.
+ * If pacl doesn't apply, something above should have
+ * executed a continue, which will skip the follwing code.
+ */
+ action = SecurityAllowOperation;
+ if (access_mode & SecurityReadAccess)
+ action = max(action, pacl->readAction);
+ if (access_mode & SecurityWriteAccess)
+ action = max(action, pacl->writeAction);
+ if (access_mode & SecurityDestroyAccess)
+ action = max(action, pacl->destroyAction);
+ break;
+ } /* end for each pacl */
+ } /* end if propertyName <= SecurityMaxPropertyName */
+
+ if (SecurityAllowOperation != action)
+ { /* audit the access violation */
+ int cid = CLIENT_ID(pWin->drawable.id);
+ int reqtype = ((xReq *)client->requestBuffer)->reqType;
+ char *actionstr = (SecurityIgnoreOperation == action) ?
+ "ignored" : "error";
+ SecurityAudit("client %d attempted request %d with window 0x%x property %s (atom 0x%x) of client %d, %s\n",
+ client->index, reqtype, pWin->drawable.id,
+ NameForAtom(propertyName), propertyName, cid, actionstr);
+ }
+ return action;
+} /* SecurityCheckPropertyAccess */
+
+
+/* SecurityResetProc
+ *
+ * Arguments:
+ * extEntry is the extension information for the security extension.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * Performs any cleanup needed by Security at server shutdown time.
+ */
+
+static void
+SecurityResetProc(extEntry)
+ ExtensionEntry *extEntry;
+{
+ SecurityFreePropertyAccessList();
+ SecurityFreeSitePolicyStrings();
+} /* SecurityResetProc */
+
+
+int
+XSecurityOptions(argc, argv, i)
+ int argc;
+ char **argv;
+ int i;
+{
+ if (strcmp(argv[i], "-sp") == 0)
+ {
+ if (i < argc)
+ SecurityPolicyFile = argv[++i];
+ return (i + 1);
+ }
+ return (i);
+} /* XSecurityOptions */
+
+
+
+/* SecurityExtensionInit
+ *
+ * Arguments: none.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * Enables the Security extension if possible.
+ */
+
+void
+SecurityExtensionInit()
+{
+ ExtensionEntry *extEntry;
+ int i;
+
+ SecurityAuthorizationResType =
+ CreateNewResourceType(SecurityDeleteAuthorization);
+
+ RTEventClient = CreateNewResourceType(
+ SecurityDeleteAuthorizationEventClient);
+
+ if (!SecurityAuthorizationResType || !RTEventClient)
+ return;
+
+ RTEventClient |= RC_NEVERRETAIN;
+
+ if (!AddCallback(&ClientStateCallback, SecurityClientStateCallback, NULL))
+ return;
+
+ extEntry = AddExtension(SECURITY_EXTENSION_NAME,
+ XSecurityNumberEvents, XSecurityNumberErrors,
+ ProcSecurityDispatch, SProcSecurityDispatch,
+ SecurityResetProc, StandardMinorOpcode);
+
+ SecurityErrorBase = extEntry->errorBase;
+ SecurityEventBase = extEntry->eventBase;
+
+ EventSwapVector[SecurityEventBase + XSecurityAuthorizationRevoked] =
+ SwapSecurityAuthorizationRevokedEvent;
+
+ /* initialize untrusted proc vectors */
+
+ for (i = 0; i < 128; i++)
+ {
+ UntrustedProcVector[i] = ProcVector[i];
+ SwappedUntrustedProcVector[i] = SwappedProcVector[i];
+ }
+
+ /* make sure insecure extensions are not allowed */
+
+ for (i = 128; i < 256; i++)
+ {
+ if (!UntrustedProcVector[i])
+ {
+ UntrustedProcVector[i] = ProcBadRequest;
+ SwappedUntrustedProcVector[i] = ProcBadRequest;
+ }
+ }
+
+ SecurityLoadPropertyAccessList();
+
+} /* SecurityExtensionInit */
projects / rdpsrv / blobdiff