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-rw-r--r--xorg-server/Xext/security.c1149
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diff --git a/xorg-server/Xext/security.c b/xorg-server/Xext/security.c
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+++ b/xorg-server/Xext/security.c
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+/*
+
+Copyright 1996, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and 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
+OPEN GROUP 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.
+
+Except as contained in this notice, the name of The Open Group 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 Open Group.
+
+*/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "scrnintstr.h"
+#include "inputstr.h"
+#include "windowstr.h"
+#include "propertyst.h"
+#include "colormapst.h"
+#include "privates.h"
+#include "registry.h"
+#include "xacestr.h"
+#include "securitysrv.h"
+#include <X11/extensions/securstr.h>
+#ifdef XAPPGROUP
+#include "appgroup.h"
+#endif
+#include "modinit.h"
+
+/* Extension stuff */
+static int SecurityErrorBase; /* first Security error number */
+static int SecurityEventBase; /* first Security event number */
+
+RESTYPE SecurityAuthorizationResType; /* resource type for authorizations */
+static RESTYPE RTEventClient;
+
+static CallbackListPtr SecurityValidateGroupCallback = NULL;
+
+/* Private state record */
+static DevPrivateKey stateKey = &stateKey;
+
+/* This is what we store as client security state */
+typedef struct {
+ int haveState;
+ unsigned int trustLevel;
+ XID authId;
+} SecurityStateRec;
+
+/* Extensions that untrusted clients shouldn't have access to */
+static char *SecurityUntrustedExtensions[] = {
+ "RandR",
+ "SECURITY",
+ "XFree86-DGA",
+ NULL
+};
+
+/*
+ * Access modes that untrusted clients are allowed on trusted objects.
+ */
+static const Mask SecurityResourceMask =
+ DixGetAttrAccess | DixReceiveAccess | DixListPropAccess |
+ DixGetPropAccess | DixListAccess;
+static const Mask SecurityRootWindowExtraMask =
+ DixReceiveAccess | DixSendAccess | DixAddAccess | DixRemoveAccess;
+static const Mask SecurityDeviceMask =
+ DixGetAttrAccess | DixReceiveAccess | DixGetFocusAccess |
+ DixGrabAccess | DixSetAttrAccess | DixUseAccess;
+static const Mask SecurityServerMask = DixGetAttrAccess | DixGrabAccess;
+static const Mask SecurityClientMask = DixGetAttrAccess;
+
+
+/* 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.
+ */
+
+static void
+SecurityAudit(char *format, ...)
+{
+ va_list args;
+
+ if (auditTrailLevel < SECURITY_AUDIT_LEVEL)
+ return;
+ va_start(args, format);
+ VAuditF(format, args);
+ va_end(args);
+} /* SecurityAudit */
+
+/*
+ * Performs a Security permission check.
+ */
+static int
+SecurityDoCheck(SecurityStateRec *subj, SecurityStateRec *obj,
+ Mask requested, Mask allowed)
+{
+ if (!subj->haveState || !obj->haveState)
+ return Success;
+ if (subj->trustLevel == XSecurityClientTrusted)
+ return Success;
+ if (obj->trustLevel != XSecurityClientTrusted)
+ return Success;
+ if ((requested | allowed) == allowed)
+ return Success;
+
+ return BadAccess;
+}
+
+/*
+ * Labels initial server objects.
+ */
+static void
+SecurityLabelInitial(void)
+{
+ SecurityStateRec *state;
+
+ /* Do the serverClient */
+ state = dixLookupPrivate(&serverClient->devPrivates, stateKey);
+ state->trustLevel = XSecurityClientTrusted;
+ state->haveState = TRUE;
+}
+
+/*
+ * Looks up a request name
+ */
+static _X_INLINE const char *
+SecurityLookupRequestName(ClientPtr client)
+{
+ int major = ((xReq *)client->requestBuffer)->reqType;
+ int minor = MinorOpcodeOfRequest(client);
+ return LookupRequestName(major, minor);
+}
+
+
+#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(
+ 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);
+ (void)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]) {
+ SecurityStateRec *state;
+ state = dixLookupPrivate(&clients[i]->devPrivates, stateKey);
+ if (state->haveState && state->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(
+ 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(
+ 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(
+ 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(
+ 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(
+ ClientPtr client)
+{
+ /* REQUEST(xSecurityQueryVersionReq); */
+ xSecurityQueryVersionReply rep;
+
+ 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(
+ 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(
+ 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 */
+ 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 */
+
+ /* 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(
+ ClientPtr client)
+{
+ REQUEST(xSecurityRevokeAuthorizationReq);
+ SecurityAuthorizationPtr pAuth;
+
+ REQUEST_SIZE_MATCH(xSecurityRevokeAuthorizationReq);
+
+ pAuth = (SecurityAuthorizationPtr)SecurityLookupIDByType(client,
+ stuff->authId, SecurityAuthorizationResType, DixDestroyAccess);
+ if (!pAuth)
+ return SecurityErrorBase + XSecurityBadAuthorization;
+
+ FreeResource(stuff->authId, RT_NONE);
+ return Success;
+} /* ProcSecurityRevokeAuthorization */
+
+
+static int
+ProcSecurityDispatch(
+ 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(
+ 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(
+ ClientPtr client)
+{
+ REQUEST(xSecurityGenerateAuthorizationReq);
+ register char n;
+ CARD32 *values;
+ unsigned long nvalues;
+ int values_offset;
+
+ swaps(&stuff->length, n);
+ REQUEST_AT_LEAST_SIZE(xSecurityGenerateAuthorizationReq);
+ swaps(&stuff->nbytesAuthProto, n);
+ swaps(&stuff->nbytesAuthData, n);
+ swapl(&stuff->valueMask, n);
+ values_offset = ((stuff->nbytesAuthProto + (unsigned)3) >> 2) +
+ ((stuff->nbytesAuthData + (unsigned)3) >> 2);
+ if (values_offset >
+ stuff->length - (sz_xSecurityGenerateAuthorizationReq >> 2))
+ return BadLength;
+ values = (CARD32 *)(&stuff[1]) + values_offset;
+ nvalues = (((CARD32 *)stuff) + stuff->length) - values;
+ SwapLongs(values, nvalues);
+ return ProcSecurityGenerateAuthorization(client);
+} /* SProcSecurityGenerateAuthorization */
+
+
+static int
+SProcSecurityRevokeAuthorization(
+ 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(
+ 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(
+ xSecurityAuthorizationRevokedEvent *from,
+ xSecurityAuthorizationRevokedEvent *to)
+{
+ to->type = from->type;
+ to->detail = from->detail;
+ cpswaps(from->sequenceNumber, to->sequenceNumber);
+ cpswapl(from->authId, to->authId);
+}
+
+/* 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.
+ */
+
+static void
+SecurityDevice(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceDeviceAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+ Mask requested = rec->access_mode;
+ Mask allowed = SecurityDeviceMask;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&serverClient->devPrivates, stateKey);
+
+ if (rec->dev != inputInfo.keyboard)
+ /* this extension only supports the core keyboard */
+ allowed = requested;
+
+ if (SecurityDoCheck(subj, obj, requested, allowed) != Success) {
+ SecurityAudit("Security denied client %d keyboard access on request "
+ "%s\n", rec->client->index,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess;
+ }
+}
+
+/* SecurityResource
+ *
+ * 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.
+ * res is a pointer to the resource structure for this resource.
+ *
+ * Returns:
+ * If access is granted, the value of rval that was passed in, else FALSE.
+ *
+ * Side Effects:
+ * Disallowed resource accesses are audited.
+ */
+
+static void
+SecurityResource(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceResourceAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+ int cid = CLIENT_ID(rec->id);
+ Mask requested = rec->access_mode;
+ Mask allowed = SecurityResourceMask;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&clients[cid]->devPrivates, stateKey);
+
+ /* disable background None for untrusted windows */
+ if ((requested & DixCreateAccess) && (rec->rtype == RT_WINDOW))
+ if (subj->haveState && subj->trustLevel != XSecurityClientTrusted)
+ ((WindowPtr)rec->res)->forcedBG = TRUE;
+
+ /* special checks for server-owned resources */
+ if (cid == 0) {
+ if (rec->rtype & RC_DRAWABLE)
+ /* additional operations allowed on root windows */
+ allowed |= SecurityRootWindowExtraMask;
+
+ else if (rec->rtype == RT_COLORMAP)
+ /* allow access to default colormaps */
+ allowed = requested;
+
+ else
+ /* allow read access to other server-owned resources */
+ allowed |= DixReadAccess;
+ }
+
+ if (SecurityDoCheck(subj, obj, requested, allowed) == Success)
+ return;
+
+#ifdef XAPPGROUP
+ if (rec->id == XagDefaultColormap(rec->client))
+ return;
+#endif
+
+ SecurityAudit("Security: denied client %d access %x to resource 0x%x "
+ "of client %d on request %s\n", rec->client->index,
+ requested, rec->id, cid,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess; /* deny access */
+}
+
+
+static void
+SecurityExtension(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceExtAccessRec *rec = calldata;
+ SecurityStateRec *subj;
+ int i = 0;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+
+ if (subj->haveState && subj->trustLevel != XSecurityClientTrusted)
+ while (SecurityUntrustedExtensions[i])
+ if (!strcmp(SecurityUntrustedExtensions[i++], rec->ext->name)) {
+ SecurityAudit("Security: denied client %d access to extension "
+ "%s on request %s\n",
+ rec->client->index, rec->ext->name,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess;
+ return;
+ }
+}
+
+static void
+SecurityServer(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceServerAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+ Mask requested = rec->access_mode;
+ Mask allowed = SecurityServerMask;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&serverClient->devPrivates, stateKey);
+
+ if (SecurityDoCheck(subj, obj, requested, allowed) != Success) {
+ SecurityAudit("Security: denied client %d access to server "
+ "configuration request %s\n", rec->client->index,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess;
+ }
+}
+
+static void
+SecurityClient(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceClientAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+ Mask requested = rec->access_mode;
+ Mask allowed = SecurityClientMask;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&rec->target->devPrivates, stateKey);
+
+ if (SecurityDoCheck(subj, obj, requested, allowed) != Success) {
+ SecurityAudit("Security: denied client %d access to client %d on "
+ "request %s\n", rec->client->index, rec->target->index,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess;
+ }
+}
+
+static void
+SecurityProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XacePropertyAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+ ATOM name = (*rec->ppProp)->propertyName;
+ Mask requested = rec->access_mode;
+ Mask allowed = SecurityResourceMask | DixReadAccess;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&wClient(rec->pWin)->devPrivates, stateKey);
+
+ if (SecurityDoCheck(subj, obj, requested, allowed) != Success) {
+ SecurityAudit("Security: denied client %d access to property %s "
+ "(atom 0x%x) window 0x%x of client %d on request %s\n",
+ rec->client->index, NameForAtom(name), name,
+ rec->pWin->drawable.id, wClient(rec->pWin)->index,
+ SecurityLookupRequestName(rec->client));
+ rec->status = BadAccess;
+ }
+}
+
+static void
+SecuritySend(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceSendAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+
+ if (rec->client) {
+ int i;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&wClient(rec->pWin)->devPrivates, stateKey);
+
+ if (SecurityDoCheck(subj, obj, DixSendAccess, 0) == Success)
+ return;
+
+ for (i = 0; i < rec->count; i++)
+ if (rec->events[i].u.u.type != UnmapNotify &&
+ rec->events[i].u.u.type != ConfigureRequest &&
+ rec->events[i].u.u.type != ClientMessage) {
+
+ SecurityAudit("Security: denied client %d from sending event "
+ "of type %s to window 0x%x of client %d\n",
+ rec->client->index, rec->pWin->drawable.id,
+ wClient(rec->pWin)->index,
+ LookupEventName(rec->events[i].u.u.type));
+ rec->status = BadAccess;
+ return;
+ }
+ }
+}
+
+static void
+SecurityReceive(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ XaceReceiveAccessRec *rec = calldata;
+ SecurityStateRec *subj, *obj;
+
+ subj = dixLookupPrivate(&rec->client->devPrivates, stateKey);
+ obj = dixLookupPrivate(&wClient(rec->pWin)->devPrivates, stateKey);
+
+ if (SecurityDoCheck(subj, obj, DixReceiveAccess, 0) == Success)
+ return;
+
+ SecurityAudit("Security: denied client %d from receiving an event "
+ "sent to window 0x%x of client %d\n",
+ rec->client->index, rec->pWin->drawable.id,
+ wClient(rec->pWin)->index);
+ rec->status = BadAccess;
+}
+
+/* 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 TRUSTLEVEL(client).
+ *
+ * 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
+SecurityClientState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
+{
+ NewClientInfoRec *pci = calldata;
+ SecurityStateRec *state;
+ SecurityAuthorizationPtr pAuth;
+ int rc;
+
+ state = dixLookupPrivate(&pci->client->devPrivates, stateKey);
+
+ switch (pci->client->clientState) {
+ case ClientStateInitial:
+ state->trustLevel = XSecurityClientTrusted;
+ state->authId = None;
+ state->haveState = TRUE;
+ break;
+
+ case ClientStateRunning:
+ state->authId = AuthorizationIDOfClient(pci->client);
+ rc = dixLookupResource((pointer *)&pAuth, state->authId,
+ SecurityAuthorizationResType, serverClient,
+ DixGetAttrAccess);
+ if (rc == Success) {
+ /* it is a generated authorization */
+ pAuth->refcnt++;
+ if (pAuth->refcnt == 1 && pAuth->timer)
+ TimerCancel(pAuth->timer);
+
+ state->trustLevel = pAuth->trustLevel;
+ }
+ break;
+
+ case ClientStateGone:
+ case ClientStateRetained:
+ rc = dixLookupResource((pointer *)&pAuth, state->authId,
+ SecurityAuthorizationResType, serverClient,
+ DixGetAttrAccess);
+ if (rc == Success) {
+ /* it is a generated authorization */
+ pAuth->refcnt--;
+ if (pAuth->refcnt == 0)
+ SecurityStartAuthorizationTimer(pAuth);
+ }
+ break;
+
+ default:
+ break;
+ }
+}
+
+/* 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(
+ ExtensionEntry *extEntry)
+{
+ /* Unregister callbacks */
+ DeleteCallback(&ClientStateCallback, SecurityClientState, NULL);
+
+ XaceDeleteCallback(XACE_EXT_DISPATCH, SecurityExtension, NULL);
+ XaceDeleteCallback(XACE_RESOURCE_ACCESS, SecurityResource, NULL);
+ XaceDeleteCallback(XACE_DEVICE_ACCESS, SecurityDevice, NULL);
+ XaceDeleteCallback(XACE_PROPERTY_ACCESS, SecurityProperty, NULL);
+ XaceDeleteCallback(XACE_SEND_ACCESS, SecuritySend, NULL);
+ XaceDeleteCallback(XACE_RECEIVE_ACCESS, SecurityReceive, NULL);
+ XaceDeleteCallback(XACE_CLIENT_ACCESS, SecurityClient, NULL);
+ XaceDeleteCallback(XACE_EXT_ACCESS, SecurityExtension, NULL);
+ XaceDeleteCallback(XACE_SERVER_ACCESS, SecurityServer, NULL);
+}
+
+
+/* SecurityExtensionInit
+ *
+ * Arguments: none.
+ *
+ * Returns: nothing.
+ *
+ * Side Effects:
+ * Enables the Security extension if possible.
+ */
+
+void
+SecurityExtensionInit(INITARGS)
+{
+ ExtensionEntry *extEntry;
+ int ret = TRUE;
+
+ SecurityAuthorizationResType =
+ CreateNewResourceType(SecurityDeleteAuthorization);
+
+ RTEventClient = CreateNewResourceType(
+ SecurityDeleteAuthorizationEventClient);
+
+ if (!SecurityAuthorizationResType || !RTEventClient)
+ return;
+
+ RTEventClient |= RC_NEVERRETAIN;
+ RegisterResourceName(SecurityAuthorizationResType, "SecurityAuthorization");
+ RegisterResourceName(RTEventClient, "SecurityEventClient");
+
+ /* Allocate the private storage */
+ if (!dixRequestPrivate(stateKey, sizeof(SecurityStateRec)))
+ FatalError("SecurityExtensionSetup: Can't allocate client private.\n");
+
+ /* Register callbacks */
+ ret &= AddCallback(&ClientStateCallback, SecurityClientState, NULL);
+
+ ret &= XaceRegisterCallback(XACE_EXT_DISPATCH, SecurityExtension, NULL);
+ ret &= XaceRegisterCallback(XACE_RESOURCE_ACCESS, SecurityResource, NULL);
+ ret &= XaceRegisterCallback(XACE_DEVICE_ACCESS, SecurityDevice, NULL);
+ ret &= XaceRegisterCallback(XACE_PROPERTY_ACCESS, SecurityProperty, NULL);
+ ret &= XaceRegisterCallback(XACE_SEND_ACCESS, SecuritySend, NULL);
+ ret &= XaceRegisterCallback(XACE_RECEIVE_ACCESS, SecurityReceive, NULL);
+ ret &= XaceRegisterCallback(XACE_CLIENT_ACCESS, SecurityClient, NULL);
+ ret &= XaceRegisterCallback(XACE_EXT_ACCESS, SecurityExtension, NULL);
+ ret &= XaceRegisterCallback(XACE_SERVER_ACCESS, SecurityServer, NULL);
+
+ if (!ret)
+ FatalError("SecurityExtensionSetup: Failed to register callbacks\n");
+
+ /* Add extension to server */
+ extEntry = AddExtension(SECURITY_EXTENSION_NAME,
+ XSecurityNumberEvents, XSecurityNumberErrors,
+ ProcSecurityDispatch, SProcSecurityDispatch,
+ SecurityResetProc, StandardMinorOpcode);
+
+ SecurityErrorBase = extEntry->errorBase;
+ SecurityEventBase = extEntry->eventBase;
+
+ EventSwapVector[SecurityEventBase + XSecurityAuthorizationRevoked] =
+ (EventSwapPtr)SwapSecurityAuthorizationRevokedEvent;
+
+ /* Label objects that were created before we could register ourself */
+ SecurityLabelInitial();
+}