src/acl/DestinationIp.cc

   1 /*
   2  * $Id$
   3  *
   4  * DEBUG: section 28    Access Control
   5  * AUTHOR: Duane Wessels
   6  *
   7  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   8  * ----------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from
  11  *  the Internet community; see the CONTRIBUTORS file for full
  12  *  details.   Many organizations have provided support for Squid's
  13  *  development; see the SPONSORS file for full details.  Squid is
  14  *  Copyrighted (C) 2001 by the Regents of the University of
  15  *  California; see the COPYRIGHT file for full details.  Squid
  16  *  incorporates software developed and/or copyrighted by other
  17  *  sources; see the CREDITS file for full details.
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  32  *
  33  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  34  */
  35
  36 #include "squid.h"
  37 #include "acl/DestinationIp.h"
  38 #include "acl/FilledChecklist.h"
  39 #include "client_side.h"
  40 #include "comm/Connection.h"
  41 #include "HttpRequest.h"
  42 #include "structs.h"
  43
  44 char const *
  45 ACLDestinationIP::typeString() const
  46 {
  47     return "dst";
  48 }
  49
  50 int
  51 ACLDestinationIP::match(ACLChecklist *cl)
  52 {
  53     ACLFilledChecklist *checklist = Filled(cl);
  54
  55     // Bug 3243: CVE 2009-0801
  56     // Bypass of browser same-origin access control in intercepted communication
  57     // To resolve this we will force DIRECT and only to the original client destination.
  58     // In which case, we also need this ACL to accurately match the destination
  59     if (Config.onoff.client_dst_passthru && checklist->request &&
  60             (checklist->request->flags.intercepted || checklist->request->flags.spoof_client_ip)) {
  61         assert(checklist->conn() && checklist->conn()->clientConnection != NULL);
  62         return ACLIP::match(checklist->conn()->clientConnection->local);
  63     }
  64
  65     const ipcache_addrs *ia = ipcache_gethostbyname(checklist->request->GetHost(), IP_LOOKUP_IF_MISS);
  66
  67     if (ia) {
  68         /* Entry in cache found */
  69
  70         for (int k = 0; k < (int) ia->count; ++k) {
  71             if (ACLIP::match(ia->in_addrs[k]))
  72                 return 1;
  73         }
  74
  75         return 0;
  76     } else if (!checklist->request->flags.destinationIPLookedUp()) {
  77         /* No entry in cache, lookup not attempted */
  78         debugs(28, 3, "aclMatchAcl: Can't yet compare '" << name << "' ACL for '" << checklist->request->GetHost() << "'");
  79         checklist->changeState (DestinationIPLookup::Instance());
  80         return 0;
  81     } else {
  82         return 0;
  83     }
  84 }
  85
  86 DestinationIPLookup DestinationIPLookup::instance_;
  87
  88 DestinationIPLookup *
  89 DestinationIPLookup::Instance()
  90 {
  91     return &instance_;
  92 }
  93
  94 void
  95 DestinationIPLookup::checkForAsync(ACLChecklist *cl)const
  96 {
  97     ACLFilledChecklist *checklist = Filled(cl);
  98     checklist->asyncInProgress(true);
  99     ipcache_nbgethostbyname(checklist->request->GetHost(), LookupDone, checklist);
 100 }
 101
 102 void
 103 DestinationIPLookup::LookupDone(const ipcache_addrs *, const DnsLookupDetails &details, void *data)
 104 {
 105     ACLFilledChecklist *checklist = Filled((ACLChecklist*)data);
 106     assert (checklist->asyncState() == DestinationIPLookup::Instance());
 107     checklist->request->flags.destinationIPLookupCompleted();
 108     checklist->request->recordLookup(details);
 109     checklist->asyncInProgress(false);
 110     checklist->changeState (ACLChecklist::NullState::Instance());
 111     checklist->matchNonBlocking();
 112 }
 113
 114 ACL *
 115 ACLDestinationIP::clone() const
 116 {
 117     return new ACLDestinationIP(*this);
 118 }