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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Google, Inc. ("Google") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY GOOGLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "platform/weborigin/SecurityPolicy.h"
     31 
     32 #include "platform/weborigin/KURL.h"
     33 #include "platform/weborigin/OriginAccessEntry.h"
     34 #include "platform/weborigin/SecurityOrigin.h"
     35 #include "wtf/HashMap.h"
     36 #include "wtf/MainThread.h"
     37 #include "wtf/OwnPtr.h"
     38 #include "wtf/PassOwnPtr.h"
     39 #include "wtf/text/StringHash.h"
     40 
     41 namespace WebCore {
     42 
     43 typedef Vector<OriginAccessEntry> OriginAccessWhiteList;
     44 typedef HashMap<String, OwnPtr<OriginAccessWhiteList> > OriginAccessMap;
     45 
     46 static OriginAccessMap& originAccessMap()
     47 {
     48     DEFINE_STATIC_LOCAL(OriginAccessMap, originAccessMap, ());
     49     return originAccessMap;
     50 }
     51 
     52 bool SecurityPolicy::shouldHideReferrer(const KURL& url, const String& referrer)
     53 {
     54     bool referrerIsSecureURL = protocolIs(referrer, "https");
     55     bool referrerIsWebURL = referrerIsSecureURL || protocolIs(referrer, "http");
     56 
     57     if (!referrerIsWebURL)
     58         return true;
     59 
     60     if (!referrerIsSecureURL)
     61         return false;
     62 
     63     bool URLIsSecureURL = url.protocolIs("https");
     64 
     65     return !URLIsSecureURL;
     66 }
     67 
     68 String SecurityPolicy::generateReferrerHeader(ReferrerPolicy referrerPolicy, const KURL& url, const String& referrer)
     69 {
     70     if (referrer.isEmpty())
     71         return String();
     72 
     73     switch (referrerPolicy) {
     74     case ReferrerPolicyNever:
     75         return String();
     76     case ReferrerPolicyAlways:
     77         return referrer;
     78     case ReferrerPolicyOrigin: {
     79         String origin = SecurityOrigin::createFromString(referrer)->toString();
     80         if (origin == "null")
     81             return String();
     82         // A security origin is not a canonical URL as it lacks a path. Add /
     83         // to turn it into a canonical URL we can use as referrer.
     84         return origin + "/";
     85     }
     86     case ReferrerPolicyDefault:
     87         break;
     88     }
     89 
     90     return shouldHideReferrer(url, referrer) ? String() : referrer;
     91 }
     92 
     93 bool SecurityPolicy::isAccessWhiteListed(const SecurityOrigin* activeOrigin, const SecurityOrigin* targetOrigin)
     94 {
     95     if (OriginAccessWhiteList* list = originAccessMap().get(activeOrigin->toString())) {
     96         for (size_t i = 0; i < list->size();  ++i) {
     97             if (list->at(i).matchesOrigin(*targetOrigin) != OriginAccessEntry::DoesNotMatchOrigin)
     98                 return true;
     99         }
    100     }
    101     return false;
    102 }
    103 
    104 bool SecurityPolicy::isAccessToURLWhiteListed(const SecurityOrigin* activeOrigin, const KURL& url)
    105 {
    106     RefPtr<SecurityOrigin> targetOrigin = SecurityOrigin::create(url);
    107     return isAccessWhiteListed(activeOrigin, targetOrigin.get());
    108 }
    109 
    110 void SecurityPolicy::addOriginAccessWhitelistEntry(const SecurityOrigin& sourceOrigin, const String& destinationProtocol, const String& destinationDomain, bool allowDestinationSubdomains)
    111 {
    112     ASSERT(isMainThread());
    113     ASSERT(!sourceOrigin.isUnique());
    114     if (sourceOrigin.isUnique())
    115         return;
    116 
    117     String sourceString = sourceOrigin.toString();
    118     OriginAccessMap::AddResult result = originAccessMap().add(sourceString, nullptr);
    119     if (result.isNewEntry)
    120         result.iterator->value = adoptPtr(new OriginAccessWhiteList);
    121 
    122     OriginAccessWhiteList* list = result.iterator->value.get();
    123     list->append(OriginAccessEntry(destinationProtocol, destinationDomain, allowDestinationSubdomains ? OriginAccessEntry::AllowSubdomains : OriginAccessEntry::DisallowSubdomains, OriginAccessEntry::TreatIPAddressAsIPAddress));
    124 }
    125 
    126 void SecurityPolicy::removeOriginAccessWhitelistEntry(const SecurityOrigin& sourceOrigin, const String& destinationProtocol, const String& destinationDomain, bool allowDestinationSubdomains)
    127 {
    128     ASSERT(isMainThread());
    129     ASSERT(!sourceOrigin.isUnique());
    130     if (sourceOrigin.isUnique())
    131         return;
    132 
    133     String sourceString = sourceOrigin.toString();
    134     OriginAccessMap& map = originAccessMap();
    135     OriginAccessMap::iterator it = map.find(sourceString);
    136     if (it == map.end())
    137         return;
    138 
    139     OriginAccessWhiteList* list = it->value.get();
    140     size_t index = list->find(OriginAccessEntry(destinationProtocol, destinationDomain, allowDestinationSubdomains ? OriginAccessEntry::AllowSubdomains : OriginAccessEntry::DisallowSubdomains, OriginAccessEntry::TreatIPAddressAsIPAddress));
    141     if (index == kNotFound)
    142         return;
    143 
    144     list->remove(index);
    145 
    146     if (list->isEmpty())
    147         map.remove(it);
    148 }
    149 
    150 void SecurityPolicy::resetOriginAccessWhitelists()
    151 {
    152     ASSERT(isMainThread());
    153     originAccessMap().clear();
    154 }
    155 
    156 } // namespace WebCore
    157