The Tor Browser / file comparison
comparison: netwerk/base/src/nsChannelClassifier.cpp
netwerk/base/src/nsChannelClassifier.cpp
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:dcbca83143f8 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "nsChannelClassifier.h" | |
| 6 | |
| 7 #include "nsNetUtil.h" | |
| 8 #include "nsIChannel.h" | |
| 9 #include "nsIProtocolHandler.h" | |
| 10 #include "nsICachingChannel.h" | |
| 11 #include "nsICacheEntryDescriptor.h" | |
| 12 #include "prlog.h" | |
| 13 #include "nsIScriptSecurityManager.h" | |
| 14 | |
| 15 #if defined(PR_LOGGING) | |
| 16 // | |
| 17 // NSPR_LOG_MODULES=nsChannelClassifier:5 | |
| 18 // | |
| 19 static PRLogModuleInfo *gChannelClassifierLog; | |
| 20 #endif | |
| 21 #undef LOG | |
| 22 #define LOG(args) PR_LOG(gChannelClassifierLog, PR_LOG_DEBUG, args) | |
| 23 | |
| 24 NS_IMPL_ISUPPORTS(nsChannelClassifier, | |
| 25 nsIURIClassifierCallback) | |
| 26 | |
| 27 nsChannelClassifier::nsChannelClassifier() | |
| 28 { | |
| 29 #if defined(PR_LOGGING) | |
| 30 if (!gChannelClassifierLog) | |
| 31 gChannelClassifierLog = PR_NewLogModule("nsChannelClassifier"); | |
| 32 #endif | |
| 33 } | |
| 34 | |
| 35 nsresult | |
| 36 nsChannelClassifier::Start(nsIChannel *aChannel) | |
| 37 { | |
| 38 // Don't bother to run the classifier on a load that has already failed. | |
| 39 // (this might happen after a redirect) | |
| 40 nsresult status; | |
| 41 aChannel->GetStatus(&status); | |
| 42 if (NS_FAILED(status)) | |
| 43 return NS_OK; | |
| 44 | |
| 45 // Don't bother to run the classifier on a cached load that was | |
| 46 // previously classified. | |
| 47 if (HasBeenClassified(aChannel)) { | |
| 48 return NS_OK; | |
| 49 } | |
| 50 | |
| 51 nsCOMPtr<nsIURI> uri; | |
| 52 nsresult rv = aChannel->GetURI(getter_AddRefs(uri)); | |
| 53 NS_ENSURE_SUCCESS(rv, rv); | |
| 54 | |
| 55 // Don't bother checking certain types of URIs. | |
| 56 bool hasFlags; | |
| 57 rv = NS_URIChainHasFlags(uri, | |
| 58 nsIProtocolHandler::URI_DANGEROUS_TO_LOAD, | |
| 59 &hasFlags); | |
| 60 NS_ENSURE_SUCCESS(rv, rv); | |
| 61 if (hasFlags) return NS_OK; | |
| 62 | |
| 63 rv = NS_URIChainHasFlags(uri, | |
| 64 nsIProtocolHandler::URI_IS_LOCAL_FILE, | |
| 65 &hasFlags); | |
| 66 NS_ENSURE_SUCCESS(rv, rv); | |
| 67 if (hasFlags) return NS_OK; | |
| 68 | |
| 69 rv = NS_URIChainHasFlags(uri, | |
| 70 nsIProtocolHandler::URI_IS_UI_RESOURCE, | |
| 71 &hasFlags); | |
| 72 NS_ENSURE_SUCCESS(rv, rv); | |
| 73 if (hasFlags) return NS_OK; | |
| 74 | |
| 75 rv = NS_URIChainHasFlags(uri, | |
| 76 nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, | |
| 77 &hasFlags); | |
| 78 NS_ENSURE_SUCCESS(rv, rv); | |
| 79 if (hasFlags) return NS_OK; | |
| 80 | |
| 81 nsCOMPtr<nsIURIClassifier> uriClassifier = | |
| 82 do_GetService(NS_URICLASSIFIERSERVICE_CONTRACTID, &rv); | |
| 83 if (rv == NS_ERROR_FACTORY_NOT_REGISTERED || | |
| 84 rv == NS_ERROR_NOT_AVAILABLE) { | |
| 85 // no URI classifier, ignore this failure. | |
| 86 return NS_OK; | |
| 87 } | |
| 88 NS_ENSURE_SUCCESS(rv, rv); | |
| 89 | |
| 90 nsCOMPtr<nsIScriptSecurityManager> securityManager = | |
| 91 do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv); | |
| 92 NS_ENSURE_SUCCESS(rv, rv); | |
| 93 | |
| 94 nsCOMPtr<nsIPrincipal> principal; | |
| 95 rv = securityManager->GetChannelPrincipal(aChannel, | |
| 96 getter_AddRefs(principal)); | |
| 97 NS_ENSURE_SUCCESS(rv, rv); | |
| 98 | |
| 99 bool expectCallback; | |
| 100 rv = uriClassifier->Classify(principal, this, &expectCallback); | |
| 101 if (NS_FAILED(rv)) return rv; | |
| 102 | |
| 103 if (expectCallback) { | |
| 104 // Suspend the channel, it will be resumed when we get the classifier | |
| 105 // callback. | |
| 106 rv = aChannel->Suspend(); | |
| 107 if (NS_FAILED(rv)) { | |
| 108 // Some channels (including nsJSChannel) fail on Suspend. This | |
| 109 // shouldn't be fatal, but will prevent malware from being | |
| 110 // blocked on these channels. | |
| 111 return NS_OK; | |
| 112 } | |
| 113 | |
| 114 mSuspendedChannel = aChannel; | |
| 115 #ifdef DEBUG | |
| 116 LOG(("nsChannelClassifier[%p]: suspended channel %p", | |
| 117 this, mSuspendedChannel.get())); | |
| 118 #endif | |
| 119 } | |
| 120 | |
| 121 return NS_OK; | |
| 122 } | |
| 123 | |
| 124 // Note in the cache entry that this URL was classified, so that future | |
| 125 // cached loads don't need to be checked. | |
| 126 void | |
| 127 nsChannelClassifier::MarkEntryClassified(nsresult status) | |
| 128 { | |
| 129 nsCOMPtr<nsICachingChannel> cachingChannel = | |
| 130 do_QueryInterface(mSuspendedChannel); | |
| 131 if (!cachingChannel) { | |
| 132 return; | |
| 133 } | |
| 134 | |
| 135 nsCOMPtr<nsISupports> cacheToken; | |
| 136 cachingChannel->GetCacheToken(getter_AddRefs(cacheToken)); | |
| 137 if (!cacheToken) { | |
| 138 return; | |
| 139 } | |
| 140 | |
| 141 nsCOMPtr<nsICacheEntryDescriptor> cacheEntry = | |
| 142 do_QueryInterface(cacheToken); | |
| 143 if (!cacheEntry) { | |
| 144 return; | |
| 145 } | |
| 146 | |
| 147 cacheEntry->SetMetaDataElement("necko:classified", | |
| 148 NS_SUCCEEDED(status) ? "1" : nullptr); | |
| 149 } | |
| 150 | |
| 151 bool | |
| 152 nsChannelClassifier::HasBeenClassified(nsIChannel *aChannel) | |
| 153 { | |
| 154 nsCOMPtr<nsICachingChannel> cachingChannel = | |
| 155 do_QueryInterface(aChannel); | |
| 156 if (!cachingChannel) { | |
| 157 return false; | |
| 158 } | |
| 159 | |
| 160 // Only check the tag if we are loading from the cache without | |
| 161 // validation. | |
| 162 bool fromCache; | |
| 163 if (NS_FAILED(cachingChannel->IsFromCache(&fromCache)) || !fromCache) { | |
| 164 return false; | |
| 165 } | |
| 166 | |
| 167 nsCOMPtr<nsISupports> cacheToken; | |
| 168 cachingChannel->GetCacheToken(getter_AddRefs(cacheToken)); | |
| 169 if (!cacheToken) { | |
| 170 return false; | |
| 171 } | |
| 172 | |
| 173 nsCOMPtr<nsICacheEntryDescriptor> cacheEntry = | |
| 174 do_QueryInterface(cacheToken); | |
| 175 if (!cacheEntry) { | |
| 176 return false; | |
| 177 } | |
| 178 | |
| 179 nsXPIDLCString tag; | |
| 180 cacheEntry->GetMetaDataElement("necko:classified", getter_Copies(tag)); | |
| 181 return tag.EqualsLiteral("1"); | |
| 182 } | |
| 183 | |
| 184 NS_IMETHODIMP | |
| 185 nsChannelClassifier::OnClassifyComplete(nsresult aErrorCode) | |
| 186 { | |
| 187 if (mSuspendedChannel) { | |
| 188 MarkEntryClassified(aErrorCode); | |
| 189 | |
| 190 if (NS_FAILED(aErrorCode)) { | |
| 191 #ifdef DEBUG | |
| 192 LOG(("nsChannelClassifier[%p]: cancelling channel %p with error " | |
| 193 "code: %x", this, mSuspendedChannel.get(), aErrorCode)); | |
| 194 #endif | |
| 195 mSuspendedChannel->Cancel(aErrorCode); | |
| 196 } | |
| 197 #ifdef DEBUG | |
| 198 LOG(("nsChannelClassifier[%p]: resuming channel %p from " | |
| 199 "OnClassifyComplete", this, mSuspendedChannel.get())); | |
| 200 #endif | |
| 201 mSuspendedChannel->Resume(); | |
| 202 mSuspendedChannel = nullptr; | |
| 203 } | |
| 204 | |
| 205 return NS_OK; | |
| 206 } |
