IABSD.fr/xenocara/xserver/os/secauth.c

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• Author : matthieu
  Date : 2006-11-26 18:13:41
  Hash : 889b8606
  Message : Importing xserver from X.Org 7.2RC2

• xserver/os/secauth.c

• /*
  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 <X11/X.h>
  #include "os.h"
  #include "osdep.h"
  #include "dixstruct.h"
  #include "swaprep.h"
  
  #ifdef XCSECURITY
  #include "securitysrv.h"
  #endif
  
  static char InvalidPolicyReason[] = "invalid policy specification";
  static char PolicyViolationReason[] = "policy violation";
  
  static Bool
  AuthCheckSitePolicy(
      unsigned short *data_lengthP,
      char	**dataP,
      ClientPtr	client,
      char	**reason)
  {
      CARD8	*policy = *(CARD8 **)dataP;
      int		length;
      Bool	permit;
      int		nPolicies;
      char	**sitePolicies;
      int		nSitePolicies;
      Bool	found = FALSE;
  
      if ((length = *data_lengthP) < 2) {
  	*reason = InvalidPolicyReason;
  	return FALSE;
      }
  
      permit = (*policy++ == 0);
      nPolicies = (CARD8) *policy++;
  
      length -= 2;
  
      sitePolicies = SecurityGetSitePolicyStrings(&nSitePolicies);
  
      while (nPolicies) {
  	int strLen, sitePolicy;
  
  	if (length == 0) {
  	    *reason = InvalidPolicyReason;
  	    return FALSE;
  	}
  
  	strLen = (CARD8) *policy++;
  	if (--length < strLen) {
  	    *reason = InvalidPolicyReason;
  	    return FALSE;
  	}
  
  	if (!found)
  	{
  	    for (sitePolicy = 0; sitePolicy < nSitePolicies; sitePolicy++)
  	    {
  		char *testPolicy = sitePolicies[sitePolicy];
  		if ((strLen == strlen(testPolicy)) &&
  		    (strncmp((char *)policy, testPolicy, strLen) == 0))
  		{
  		    found = TRUE; /* need to continue parsing the policy... */
  		    break;
  		}
  	    }
  	}
  
  	policy += strLen;
  	length -= strLen;
  	nPolicies--;
      }
  
      if (found != permit)
      {
  	*reason = PolicyViolationReason;
  	return FALSE;
      }
  
      *data_lengthP = length;
      *dataP = (char *)policy;
      return TRUE;
  }
  
  XID
  AuthSecurityCheck (
      unsigned short	data_length,
      char		*data,
      ClientPtr		client,
      char		**reason)
  {
  #ifdef XCSECURITY
      xConnSetupPrefix csp;
      xReq freq;
  
      if (client->clientState == ClientStateCheckedSecurity)
      {
  	*reason = "repeated security check not permitted";
  	return (XID) -1;
      }
      else if (data_length > 0)
      {
  	char policy_mask = *data++;
  
  	if (--data_length == 1) {
  	    *reason = InvalidPolicyReason;
  	    return (XID) -1;
  	}
  
  	if (policy_mask & 0x01)	/* Extensions policy */
  	{
  	 /* AuthCheckExtensionPolicy(&data_length, &data, client, reason) */
  	    *reason = "security policy not implemented";
  	    return (XID) -1;
  	}
  
  	if (policy_mask & 0x02)	/* Site policy */
  	{
  	    if (!AuthCheckSitePolicy(&data_length, &data, client, reason))
  		return (XID) -1;
  	}
  
  	if (data_length > 0) {	/* did we consume the whole policy? */
  	    *reason = InvalidPolicyReason;
  	    return (XID) -1;
  	}
  
      }
      else if (!GetAccessControl())
      {
  	/*
  	 * The client - possibly the X FireWall Proxy - gave
  	 * no auth data and host-based authorization is turned
  	 * off.  In this case, the client should be denied
  	 * access to the X server.
  	 */
  	*reason = "server host access control is disabled";
  	return (XID) -1;
      }
  
      client->clientState = ClientStateCheckingSecurity;
  
      csp.success = 2 /* Authenticate */;
      csp.lengthReason = 0;
      csp.length = 0;
      csp.majorVersion = X_PROTOCOL;
      csp.minorVersion = X_PROTOCOL_REVISION;
      if (client->swapped)
  	WriteSConnSetupPrefix(client, &csp);
      else
  	(void)WriteToClient(client, sz_xConnSetupPrefix, (char *) &csp);
  
      /*
       * Next time the client sends the real auth data, we want
       * ProcEstablishConnection to be called.
       */
  
      freq.reqType = 1;
      freq.length = (sz_xReq + sz_xConnClientPrefix) >> 2;
      client->swapped = FALSE;
      if (!InsertFakeRequest(client, (char *)&freq, sz_xReq))
      {
  	*reason = "internal error";
  	return (XID) -1;
      }
  
      return (XID) 0;
  #else
      *reason = "method not supported";
      return (XID) -1;
  #endif
  }