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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 "weborigin/SecurityPolicy.h"
     31 
     32 #include <wtf/MainThread.h>
     33 #include <wtf/OwnPtr.h>
     34 #include <wtf/PassOwnPtr.h>
     35 #include <wtf/text/StringHash.h>
     36 #include "weborigin/KURL.h"
     37 #include "weborigin/OriginAccessEntry.h"
     38 #include "weborigin/SecurityOrigin.h"
     39 
     40 namespace WebCore {
     41 
     42 typedef Vector<OriginAccessEntry> OriginAccessWhiteList;
     43 typedef HashMap<String, OwnPtr<OriginAccessWhiteList> > OriginAccessMap;
     44 
     45 static OriginAccessMap& originAccessMap()
     46 {
     47     DEFINE_STATIC_LOCAL(OriginAccessMap, originAccessMap, ());
     48     return originAccessMap;
     49 }
     50 
     51 bool SecurityPolicy::shouldHideReferrer(const KURL& url, const String& referrer)
     52 {
     53     bool referrerIsSecureURL = protocolIs(referrer, "https");
     54     bool referrerIsWebURL = referrerIsSecureURL || protocolIs(referrer, "http");
     55 
     56     if (!referrerIsWebURL)
     57         return true;
     58 
     59     if (!referrerIsSecureURL)
     60         return false;
     61 
     62     bool URLIsSecureURL = url.protocolIs("https");
     63 
     64     return !URLIsSecureURL;
     65 }
     66 
     67 String SecurityPolicy::generateReferrerHeader(ReferrerPolicy referrerPolicy, const KURL& url, const String& referrer)
     68 {
     69     if (referrer.isEmpty())
     70         return String();
     71 
     72     switch (referrerPolicy) {
     73     case ReferrerPolicyNever:
     74         return String();
     75     case ReferrerPolicyAlways:
     76         return referrer;
     77     case ReferrerPolicyOrigin: {
     78         String origin = SecurityOrigin::createFromString(referrer)->toString();
     79         if (origin == "null")
     80             return String();
     81         // A security origin is not a canonical URL as it lacks a path. Add /
     82         // to turn it into a canonical URL we can use as referrer.
     83         return origin + "/";
     84     }
     85     case ReferrerPolicyDefault:
     86         break;
     87     }
     88 
     89     return shouldHideReferrer(url, referrer) ? String() : referrer;
     90 }
     91 
     92 bool SecurityPolicy::isAccessWhiteListed(const SecurityOrigin* activeOrigin, const SecurityOrigin* targetOrigin)
     93 {
     94     if (OriginAccessWhiteList* list = originAccessMap().get(activeOrigin->toString())) {
     95         for (size_t i = 0; i < list->size();  ++i) {
     96            if (list->at(i).matchesOrigin(*targetOrigin))
     97                return true;
     98        }
     99     }
    100     return false;
    101 }
    102 
    103 bool SecurityPolicy::isAccessToURLWhiteListed(const SecurityOrigin* activeOrigin, const KURL& url)
    104 {
    105     RefPtr<SecurityOrigin> targetOrigin = SecurityOrigin::create(url);
    106     return isAccessWhiteListed(activeOrigin, targetOrigin.get());
    107 }
    108 
    109 void SecurityPolicy::addOriginAccessWhitelistEntry(const SecurityOrigin& sourceOrigin, const String& destinationProtocol, const String& destinationDomain, bool allowDestinationSubdomains)
    110 {
    111     ASSERT(isMainThread());
    112     ASSERT(!sourceOrigin.isUnique());
    113     if (sourceOrigin.isUnique())
    114         return;
    115 
    116     String sourceString = sourceOrigin.toString();
    117     OriginAccessMap::AddResult result = originAccessMap().add(sourceString, nullptr);
    118     if (result.isNewEntry)
    119         result.iterator->value = adoptPtr(new OriginAccessWhiteList);
    120 
    121     OriginAccessWhiteList* list = result.iterator->value.get();
    122     list->append(OriginAccessEntry(destinationProtocol, destinationDomain, allowDestinationSubdomains ? OriginAccessEntry::AllowSubdomains : OriginAccessEntry::DisallowSubdomains));
    123 }
    124 
    125 void SecurityPolicy::removeOriginAccessWhitelistEntry(const SecurityOrigin& sourceOrigin, const String& destinationProtocol, const String& destinationDomain, bool allowDestinationSubdomains)
    126 {
    127     ASSERT(isMainThread());
    128     ASSERT(!sourceOrigin.isUnique());
    129     if (sourceOrigin.isUnique())
    130         return;
    131 
    132     String sourceString = sourceOrigin.toString();
    133     OriginAccessMap& map = originAccessMap();
    134     OriginAccessMap::iterator it = map.find(sourceString);
    135     if (it == map.end())
    136         return;
    137 
    138     OriginAccessWhiteList* list = it->value.get();
    139     size_t index = list->find(OriginAccessEntry(destinationProtocol, destinationDomain, allowDestinationSubdomains ? OriginAccessEntry::AllowSubdomains : OriginAccessEntry::DisallowSubdomains));
    140     if (index == notFound)
    141         return;
    142 
    143     list->remove(index);
    144 
    145     if (list->isEmpty())
    146         map.remove(it);
    147 }
    148 
    149 void SecurityPolicy::resetOriginAccessWhitelists()
    150 {
    151     ASSERT(isMainThread());
    152     originAccessMap().clear();
    153 }
    154 
    155 } // namespace WebCore
    156