src/acl/DestinationIp.cc

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