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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "platform/feature_policy/FeaturePolicy.h" |
| 6 |
| 7 #include "platform/json/JSONValues.h" |
| 8 #include "platform/network/HTTPParsers.h" |
| 9 #include "platform/weborigin/KURL.h" |
| 10 #include "platform/weborigin/SecurityOrigin.h" |
| 11 #include "wtf/text/StringBuilder.h" |
| 12 |
| 13 namespace blink { |
| 14 |
| 15 namespace { |
| 16 |
| 17 // Given a string name, return the matching feature struct, or nullptr if it is |
| 18 // not the name of a policy-controlled feature. |
| 19 const FeaturePolicy::Feature* featureForName( |
| 20 const String& featureName, |
| 21 FeaturePolicy::FeatureList& features) { |
| 22 for (const FeaturePolicy::Feature* feature : features) { |
| 23 if (featureName == feature->featureName) |
| 24 return feature; |
| 25 } |
| 26 return nullptr; |
| 27 } |
| 28 |
| 29 // Converts a list of JSON feature policy items into a mapping of features to |
| 30 // whitelists. For future compatibility, unrecognized features are simply |
| 31 // ignored, as are unparseable origins. Any errors in the input will cause an |
| 32 // error message appended to |messages|. |
| 33 HashMap<const FeaturePolicy::Feature*, |
| 34 std::unique_ptr<FeaturePolicy::Whitelist>> |
| 35 parseFeaturePolicyString(std::unique_ptr<JSONArray> policyItems, |
| 36 RefPtr<SecurityOrigin> origin, |
| 37 FeaturePolicy::FeatureList& features, |
| 38 Vector<String>& messages) { |
| 39 HashMap<const FeaturePolicy::Feature*, |
| 40 std::unique_ptr<FeaturePolicy::Whitelist>> |
| 41 whitelists; |
| 42 |
| 43 for (size_t i = 0; i < policyItems->size(); ++i) { |
| 44 JSONObject* item = JSONObject::cast(policyItems->at(i)); |
| 45 if (!item) { |
| 46 messages.append("Policy is not an object"); |
| 47 continue; // Array element is not an object; skip |
| 48 } |
| 49 |
| 50 for (size_t j = 0; j < item->size(); ++j) { |
| 51 JSONObject::Entry entry = item->at(j); |
| 52 String featureName = entry.first; |
| 53 JSONArray* targets = JSONArray::cast(entry.second); |
| 54 if (!targets) { |
| 55 messages.append("Whitelist is not an array of strings."); |
| 56 continue; |
| 57 } |
| 58 |
| 59 const FeaturePolicy::Feature* feature = |
| 60 featureForName(featureName, features); |
| 61 if (!feature) |
| 62 continue; // Feature is not recognized; skip |
| 63 |
| 64 std::unique_ptr<FeaturePolicy::Whitelist> whitelist( |
| 65 new FeaturePolicy::Whitelist); |
| 66 String targetString; |
| 67 for (size_t j = 0; j < targets->size(); ++j) { |
| 68 if (targets->at(j)->asString(&targetString)) { |
| 69 if (equalIgnoringCase(targetString, "self")) { |
| 70 whitelist->add(origin); |
| 71 } else if (targetString == "*") { |
| 72 whitelist->addAll(); |
| 73 } else { |
| 74 KURL originUrl = KURL(KURL(), targetString); |
| 75 if (originUrl.isValid()) { |
| 76 whitelist->add(SecurityOrigin::create(originUrl)); |
| 77 } |
| 78 } |
| 79 } else { |
| 80 messages.append("Whitelist is not an array of strings."); |
| 81 } |
| 82 } |
| 83 whitelists.set(feature, std::move(whitelist)); |
| 84 } |
| 85 } |
| 86 return whitelists; |
| 87 } |
| 88 |
| 89 } // namespace |
| 90 |
| 91 // Definitions of all features controlled by Feature Policy should appear here. |
| 92 const FeaturePolicy::Feature kDocumentCookie{ |
| 93 "cookie", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 94 const FeaturePolicy::Feature kDocumentDomain{ |
| 95 "domain", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 96 const FeaturePolicy::Feature kDocumentWrite{ |
| 97 "docwrite", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 98 const FeaturePolicy::Feature kGeolocationFeature{ |
| 99 "geolocation", FeaturePolicy::FeatureDefault::EnableForSelf}; |
| 100 const FeaturePolicy::Feature kMidiFeature{ |
| 101 "midi", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 102 const FeaturePolicy::Feature kNotificationsFeature{ |
| 103 "notifications", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 104 const FeaturePolicy::Feature kPaymentFeature{ |
| 105 "payment", FeaturePolicy::FeatureDefault::EnableForSelf}; |
| 106 const FeaturePolicy::Feature kPushFeature{ |
| 107 "push", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 108 const FeaturePolicy::Feature kSyncScript{ |
| 109 "sync-script", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 110 const FeaturePolicy::Feature kSyncXHR{ |
| 111 "sync-xhr", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 112 const FeaturePolicy::Feature kUsermedia{ |
| 113 "usermedia", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 114 const FeaturePolicy::Feature kVibrateFeature{ |
| 115 "vibrate", FeaturePolicy::FeatureDefault::EnableForSelf}; |
| 116 const FeaturePolicy::Feature kWebRTC{ |
| 117 "webrtc", FeaturePolicy::FeatureDefault::EnableForAll}; |
| 118 |
| 119 FeaturePolicy::Whitelist::Whitelist() : m_matchesAllOrigins(false) {} |
| 120 |
| 121 void FeaturePolicy::Whitelist::addAll() { |
| 122 m_matchesAllOrigins = true; |
| 123 } |
| 124 |
| 125 void FeaturePolicy::Whitelist::add(RefPtr<SecurityOrigin> origin) { |
| 126 m_origins.append(std::move(origin)); |
| 127 } |
| 128 |
| 129 bool FeaturePolicy::Whitelist::contains(const SecurityOrigin& origin) const { |
| 130 if (m_matchesAllOrigins) |
| 131 return true; |
| 132 for (const auto& targetOrigin : m_origins) { |
| 133 if (targetOrigin->isSameSchemeHostPortAndSuborigin(&origin)) |
| 134 return true; |
| 135 } |
| 136 return false; |
| 137 } |
| 138 |
| 139 String FeaturePolicy::Whitelist::toString() { |
| 140 StringBuilder sb; |
| 141 sb.append("["); |
| 142 if (m_matchesAllOrigins) { |
| 143 sb.append("*"); |
| 144 } else { |
| 145 for (size_t i = 0; i < m_origins.size(); ++i) { |
| 146 if (i > 0) { |
| 147 sb.append(", "); |
| 148 } |
| 149 sb.append(m_origins[i]->toString()); |
| 150 } |
| 151 } |
| 152 sb.append("]"); |
| 153 return sb.toString(); |
| 154 } |
| 155 |
| 156 // static |
| 157 const FeaturePolicy::FeatureList& FeaturePolicy::getDefaultFeatureList() { |
| 158 DEFINE_STATIC_LOCAL( |
| 159 Vector<const FeaturePolicy::Feature*>, defaultFeatureList, |
| 160 ({&kDocumentCookie, &kDocumentDomain, &kDocumentWrite, |
| 161 &kGeolocationFeature, &kMidiFeature, &kNotificationsFeature, |
| 162 &kPaymentFeature, &kPushFeature, &kSyncScript, &kSyncXHR, &kUsermedia, |
| 163 &kVibrateFeature, &kWebRTC})); |
| 164 return defaultFeatureList; |
| 165 } |
| 166 |
| 167 // static |
| 168 FeaturePolicy* FeaturePolicy::createFromParentPolicy( |
| 169 const FeaturePolicy* parent, |
| 170 RefPtr<SecurityOrigin> currentOrigin, |
| 171 FeaturePolicy::FeatureList& features) { |
| 172 DCHECK(currentOrigin); |
| 173 FeaturePolicy* newPolicy = new FeaturePolicy(currentOrigin, features); |
| 174 for (const FeaturePolicy::Feature* feature : features) { |
| 175 if (!parent || parent->isFeatureEnabledForOrigin(feature, *currentOrigin)) { |
| 176 newPolicy->m_inheritedFeatures.set(feature, true); |
| 177 } else { |
| 178 newPolicy->m_inheritedFeatures.set(feature, false); |
| 179 } |
| 180 } |
| 181 return newPolicy; |
| 182 } |
| 183 |
| 184 // static |
| 185 FeaturePolicy* FeaturePolicy::createFromParentPolicy( |
| 186 const FeaturePolicy* parent, |
| 187 RefPtr<SecurityOrigin> currentOrigin) { |
| 188 return createFromParentPolicy(parent, currentOrigin, getDefaultFeatureList()); |
| 189 } |
| 190 |
| 191 void FeaturePolicy::setHeaderPolicy(const String& policy, |
| 192 Vector<String>& messages) { |
| 193 DCHECK(m_headerWhitelists.isEmpty()); |
| 194 std::unique_ptr<JSONArray> policyJSON = parseJSONHeader(policy); |
| 195 if (!policyJSON) { |
| 196 messages.append("Unable to parse header"); |
| 197 return; |
| 198 } |
| 199 m_headerWhitelists = parseFeaturePolicyString(std::move(policyJSON), m_origin, |
| 200 m_features, messages); |
| 201 } |
| 202 |
| 203 bool FeaturePolicy::isFeatureEnabledForOrigin( |
| 204 const FeaturePolicy::Feature* feature, |
| 205 const SecurityOrigin& origin) const { |
| 206 DCHECK(m_inheritedFeatures.contains(feature)); |
| 207 if (!m_inheritedFeatures.get(feature)) { |
| 208 return false; |
| 209 } |
| 210 if (m_headerWhitelists.contains(feature)) { |
| 211 return m_headerWhitelists.get(feature)->contains(origin); |
| 212 } |
| 213 if (feature->defaultPolicy == FeaturePolicy::FeatureDefault::EnableForAll) { |
| 214 return true; |
| 215 } |
| 216 if (feature->defaultPolicy == FeaturePolicy::FeatureDefault::EnableForSelf) { |
| 217 return m_origin->isSameSchemeHostPortAndSuborigin(&origin); |
| 218 } |
| 219 return false; |
| 220 } |
| 221 |
| 222 bool FeaturePolicy::isFeatureEnabled( |
| 223 const FeaturePolicy::Feature* feature) const { |
| 224 DCHECK(m_origin); |
| 225 return isFeatureEnabledForOrigin(feature, *m_origin); |
| 226 } |
| 227 |
| 228 FeaturePolicy::FeaturePolicy(RefPtr<SecurityOrigin> currentOrigin, |
| 229 FeaturePolicy::FeatureList& features) |
| 230 : m_origin(std::move(currentOrigin)), m_features(features) {} |
| 231 |
| 232 String FeaturePolicy::toString() { |
| 233 StringBuilder sb; |
| 234 sb.append("Feature Policy for frame in origin: "); |
| 235 sb.append(m_origin->toString()); |
| 236 sb.append("\n"); |
| 237 sb.append("Inherited features:\n"); |
| 238 for (const auto& inheritedFeature : m_inheritedFeatures) { |
| 239 sb.append(" "); |
| 240 sb.append(inheritedFeature.key->featureName); |
| 241 sb.append(": "); |
| 242 sb.append(inheritedFeature.value ? "true" : "false"); |
| 243 sb.append("\n"); |
| 244 } |
| 245 sb.append("Header whitelists:\n"); |
| 246 for (const auto& whitelist : m_headerWhitelists) { |
| 247 sb.append(" "); |
| 248 sb.append(whitelist.key->featureName); |
| 249 sb.append(": "); |
| 250 sb.append(whitelist.value->toString()); |
| 251 sb.append("\n"); |
| 252 } |
| 253 return sb.toString(); |
| 254 } |
| 255 |
| 256 } // namespace blink |
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