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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "PartitioningExceptionList.h"
#include "AntiTrackingLog.h"
#include "nsContentUtils.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
namespace mozilla {
namespace {
static constexpr std::array<nsLiteralCString, 2> kSupportedSchemes = {
{"https://"_ns, "http://"_ns}};
StaticRefPtr<PartitioningExceptionList> gPartitioningExceptionList;
} // namespace
NS_IMPL_ISUPPORTS(PartitioningExceptionList,
nsIPartitioningExceptionListObserver)
bool PartitioningExceptionList::Check(const nsACString& aFirstPartyOrigin,
const nsACString& aThirdPartyOrigin) {
if (!StaticPrefs::privacy_antitracking_enableWebcompat()) {
LOG(("Partition exception list disabled via pref"));
return false;
}
if (aFirstPartyOrigin.IsEmpty() || aFirstPartyOrigin == "null" ||
aThirdPartyOrigin.IsEmpty() || aThirdPartyOrigin == "null") {
return false;
}
LOG(("Check partitioning exception list for url %s and %s",
PromiseFlatCString(aFirstPartyOrigin).get(),
PromiseFlatCString(aThirdPartyOrigin).get()));
for (PartitionExceptionListEntry& entry : GetOrCreate()->mExceptionList) {
if (OriginMatchesPattern(aFirstPartyOrigin, entry.mFirstParty) &&
OriginMatchesPattern(aThirdPartyOrigin, entry.mThirdParty)) {
LOG(("Found partitioning exception list entry for %s and %s",
PromiseFlatCString(aFirstPartyOrigin).get(),
PromiseFlatCString(aThirdPartyOrigin).get()));
return true;
}
}
return false;
}
PartitioningExceptionList* PartitioningExceptionList::GetOrCreate() {
if (!gPartitioningExceptionList) {
gPartitioningExceptionList = new PartitioningExceptionList();
gPartitioningExceptionList->Init();
RunOnShutdown([&] {
gPartitioningExceptionList->Shutdown();
gPartitioningExceptionList = nullptr;
});
}
return gPartitioningExceptionList;
}
nsresult PartitioningExceptionList::Init() {
mService =
do_GetService("@mozilla.org/partitioning/exception-list-service;1");
if (NS_WARN_IF(!mService)) {
return NS_ERROR_FAILURE;
}
mService->RegisterAndRunExceptionListObserver(this);
return NS_OK;
}
void PartitioningExceptionList::Shutdown() {
if (mService) {
mService->UnregisterExceptionListObserver(this);
mService = nullptr;
}
mExceptionList.Clear();
}
NS_IMETHODIMP
PartitioningExceptionList::OnExceptionListUpdate(const nsACString& aList) {
mExceptionList.Clear();
nsresult rv;
for (const nsACString& item : aList.Split(';')) {
auto origins = item.Split(',');
auto originsIt = origins.begin();
if (originsIt == origins.end()) {
LOG(("Ignoring empty exception entry"));
continue;
}
PartitionExceptionListEntry entry;
rv = GetExceptionListPattern(*originsIt, entry.mFirstParty);
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
++originsIt;
if (originsIt == origins.end()) {
LOG(("Ignoring incomplete exception entry"));
continue;
}
rv = GetExceptionListPattern(*originsIt, entry.mThirdParty);
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
if (entry.mFirstParty.mSuffix == "*" && entry.mThirdParty.mSuffix == "*") {
LOG(("Ignoring *,* exception entry"));
continue;
}
LOG(("onExceptionListUpdate: %s%s - %s%s", entry.mFirstParty.mScheme.get(),
entry.mFirstParty.mSuffix.get(), entry.mThirdParty.mScheme.get(),
entry.mThirdParty.mSuffix.get()));
mExceptionList.AppendElement(entry);
}
return NS_OK;
}
nsresult PartitioningExceptionList::GetSchemeFromOrigin(
const nsACString& aOrigin, nsACString& aScheme,
nsACString& aOriginNoScheme) {
NS_ENSURE_FALSE(aOrigin.IsEmpty(), NS_ERROR_INVALID_ARG);
for (const auto& scheme : kSupportedSchemes) {
if (aOrigin.Length() <= scheme.Length() ||
!StringBeginsWith(aOrigin, scheme)) {
continue;
}
aScheme = Substring(aOrigin, 0, scheme.Length());
aOriginNoScheme = Substring(aOrigin, scheme.Length());
return NS_OK;
}
return NS_ERROR_FAILURE;
}
bool PartitioningExceptionList::OriginMatchesPattern(
const nsACString& aOrigin, const PartitionExceptionListPattern& aPattern) {
if (NS_WARN_IF(aOrigin.IsEmpty())) {
return false;
}
if (aPattern.mSuffix == "*") {
return true;
}
nsAutoCString scheme, originNoScheme;
nsresult rv = GetSchemeFromOrigin(aOrigin, scheme, originNoScheme);
NS_ENSURE_SUCCESS(rv, false);
// Always strict match scheme.
if (scheme != aPattern.mScheme) {
return false;
}
if (!aPattern.mIsWildCard) {
// aPattern is not a wildcard, match strict.
return originNoScheme == aPattern.mSuffix;
}
// For wildcard patterns, check if origin suffix matches pattern suffix.
return StringEndsWith(originNoScheme, aPattern.mSuffix);
}
// Parses a string with an origin or an origin-pattern into a
// PartitionExceptionListPattern.
nsresult PartitioningExceptionList::GetExceptionListPattern(
const nsACString& aOriginPattern, PartitionExceptionListPattern& aPattern) {
NS_ENSURE_FALSE(aOriginPattern.IsEmpty(), NS_ERROR_INVALID_ARG);
if (aOriginPattern == "*") {
aPattern.mIsWildCard = true;
aPattern.mSuffix = "*";
return NS_OK;
}
nsAutoCString originPatternNoScheme;
nsresult rv = GetSchemeFromOrigin(aOriginPattern, aPattern.mScheme,
originPatternNoScheme);
NS_ENSURE_SUCCESS(rv, rv);
if (StringBeginsWith(originPatternNoScheme, "*"_ns)) {
NS_ENSURE_TRUE(originPatternNoScheme.Length() > 2, NS_ERROR_INVALID_ARG);
aPattern.mIsWildCard = true;
aPattern.mSuffix = Substring(originPatternNoScheme, 1);
return NS_OK;
}
aPattern.mIsWildCard = false;
aPattern.mSuffix = originPatternNoScheme;
return NS_OK;
}
} // namespace mozilla
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