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gecko-dev
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gecko-dev/netwerk/dns/TRRService.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsAppDirectoryServiceDefs.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsComponentManagerUtils.h"
#include "nsDirectoryServiceUtils.h"
#include "nsICaptivePortalService.h"
#include "nsIFile.h"
#include "nsIParentalControlsService.h"
#include "nsINetworkLinkService.h"
#include "nsIObserverService.h"
#include "nsIOService.h"
#include "nsNetUtil.h"
#include "nsStandardURL.h"
#include "TRR.h"
#include "TRRService.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TelemetryComms.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/net/rust_helper.h"
// Put DNSLogging.h at the end to avoid LOG being overwritten by other headers.
#include "DNSLogging.h"
#if defined(XP_WIN) && !defined(__MINGW32__)
# include <shlobj_core.h> // for SHGetSpecialFolderPathA
#endif // XP_WIN
static const char kOpenCaptivePortalLoginEvent[] = "captive-portal-login";
static const char kClearPrivateData[] = "clear-private-data";
static const char kPurge[] = "browser:purge-session-history";
static const char kDisableIpv6Pref[] = "network.dns.disableIPv6";
#define TRR_PREF_PREFIX "network.trr."
#define TRR_PREF(x) TRR_PREF_PREFIX x
namespace mozilla {
namespace net {
TRRService* gTRRService = nullptr;
StaticRefPtr<nsIThread> sTRRBackgroundThread;
static Atomic<TRRService*> sTRRServicePtr;
static Atomic<size_t, Relaxed> sDomainIndex(0);
constexpr nsLiteralCString kTRRDomains[] = {
// clang-format off
"(other)"_ns,
"mozilla.cloudflare-dns.com"_ns,
"firefox.dns.nextdns.io"_ns,
"doh.xfinity.com"_ns, // Steered clients
// clang-format on
};
// static
const nsCString& TRRService::ProviderKey() { return kTRRDomains[sDomainIndex]; }
NS_IMPL_ISUPPORTS(TRRService, nsIObserver, nsISupportsWeakReference)
NS_IMPL_ADDREF_USING_AGGREGATOR(TRRService::ConfirmationContext, OwningObject())
NS_IMPL_RELEASE_USING_AGGREGATOR(TRRService::ConfirmationContext,
OwningObject())
NS_IMPL_QUERY_INTERFACE(TRRService::ConfirmationContext, nsITimerCallback)
TRRService::TRRService() { MOZ_ASSERT(NS_IsMainThread(), "wrong thread"); }
// static
void TRRService::AddObserver(nsIObserver* aObserver,
nsIObserverService* aObserverService) {
nsCOMPtr<nsIObserverService> observerService;
if (aObserverService) {
observerService = aObserverService;
} else {
observerService = mozilla::services::GetObserverService();
}
if (observerService) {
observerService->AddObserver(aObserver, NS_CAPTIVE_PORTAL_CONNECTIVITY,
true);
observerService->AddObserver(aObserver, kOpenCaptivePortalLoginEvent, true);
observerService->AddObserver(aObserver, kClearPrivateData, true);
observerService->AddObserver(aObserver, kPurge, true);
observerService->AddObserver(aObserver, NS_NETWORK_LINK_TOPIC, true);
observerService->AddObserver(aObserver, NS_DNS_SUFFIX_LIST_UPDATED_TOPIC,
true);
observerService->AddObserver(aObserver, "xpcom-shutdown-threads", true);
}
}
// static
bool TRRService::CheckCaptivePortalIsPassed() {
bool result = false;
nsCOMPtr<nsICaptivePortalService> captivePortalService =
do_GetService(NS_CAPTIVEPORTAL_CID);
if (captivePortalService) {
int32_t captiveState;
MOZ_ALWAYS_SUCCEEDS(captivePortalService->GetState(&captiveState));
if ((captiveState == nsICaptivePortalService::UNLOCKED_PORTAL) ||
(captiveState == nsICaptivePortalService::NOT_CAPTIVE)) {
result = true;
}
LOG(("TRRService::Init mCaptiveState=%d mCaptiveIsPassed=%d\n",
captiveState, (int)result));
}
return result;
}
static void RemoveTRRBlocklistFile() {
MOZ_ASSERT(NS_IsMainThread(), "Getting the profile dir on the main thread");
nsCOMPtr<nsIFile> file;
nsresult rv =
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(file));
if (NS_FAILED(rv)) {
return;
}
rv = file->AppendNative("TRRBlacklist.txt"_ns);
if (NS_FAILED(rv)) {
return;
}
// Dispatch an async task that removes the blocklist file from the profile.
rv = NS_DispatchBackgroundTask(
NS_NewRunnableFunction("RemoveTRRBlocklistFile::Remove",
[file] { file->Remove(false); }),
NS_DISPATCH_EVENT_MAY_BLOCK);
if (NS_FAILED(rv)) {
return;
}
Preferences::SetBool("network.trr.blocklist_cleanup_done", true);
}
static void EventTelemetryPrefChanged(const char* aPref, void* aData) {
Telemetry::SetEventRecordingEnabled(
"network.dns"_ns,
StaticPrefs::network_trr_confirmation_telemetry_enabled());
}
nsresult TRRService::Init() {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
if (mInitialized) {
return NS_OK;
}
mInitialized = true;
AddObserver(this);
nsCOMPtr<nsIPrefBranch> prefBranch;
GetPrefBranch(getter_AddRefs(prefBranch));
if (prefBranch) {
prefBranch->AddObserver(TRR_PREF_PREFIX, this, true);
prefBranch->AddObserver(kDisableIpv6Pref, this, true);
prefBranch->AddObserver(kRolloutURIPref, this, true);
prefBranch->AddObserver(kRolloutModePref, this, true);
}
gTRRService = this;
sTRRServicePtr = this;
ReadPrefs(nullptr);
mConfirmation.HandleEvent(ConfirmationEvent::Init);
if (XRE_IsParentProcess()) {
mCaptiveIsPassed = CheckCaptivePortalIsPassed();
mParentalControlEnabled = GetParentalControlEnabledInternal();
mLinkService = do_GetService(NS_NETWORK_LINK_SERVICE_CONTRACTID);
if (mLinkService) {
nsTArray<nsCString> suffixList;
mLinkService->GetDnsSuffixList(suffixList);
RebuildSuffixList(std::move(suffixList));
}
nsCOMPtr<nsIThread> thread;
if (NS_FAILED(
NS_NewNamedThread("TRR Background", getter_AddRefs(thread)))) {
NS_WARNING("NS_NewNamedThread failed!");
return NS_ERROR_FAILURE;
}
sTRRBackgroundThread = thread;
if (!StaticPrefs::network_trr_blocklist_cleanup_done()) {
// Dispatch an idle task to the main thread that gets the profile dir
// then attempts to delete the blocklist file on a background thread.
Unused << NS_DispatchToMainThreadQueue(
NS_NewCancelableRunnableFunction("RemoveTRRBlocklistFile::GetDir",
[] { RemoveTRRBlocklistFile(); }),
EventQueuePriority::Idle);
}
}
mODoHService = new ODoHService();
if (!mODoHService->Init()) {
return NS_ERROR_FAILURE;
}
Preferences::RegisterCallbackAndCall(
EventTelemetryPrefChanged,
"network.trr.confirmation_telemetry_enabled"_ns);
LOG(("Initialized TRRService\n"));
return NS_OK;
}
// static
bool TRRService::GetParentalControlEnabledInternal() {
nsCOMPtr<nsIParentalControlsService> pc =
do_CreateInstance("@mozilla.org/parental-controls-service;1");
if (pc) {
bool result = false;
pc->GetParentalControlsEnabled(&result);
LOG(("TRRService::GetParentalControlEnabledInternal=%d\n", result));
return result;
}
return false;
}
void TRRService::SetDetectedTrrURI(const nsACString& aURI) {
LOG(("SetDetectedTrrURI(%s", nsPromiseFlatCString(aURI).get()));
// If the user has set a custom URI then we don't want to override that.
// If the URI is set via doh-rollout.uri, mURIPrefHasUserValue will be false
// (see TRRServiceBase::OnTRRURIChange)
if (mURIPrefHasUserValue) {
LOG(("Already has user value. Not setting URI"));
return;
}
mURISetByDetection = MaybeSetPrivateURI(aURI);
}
bool TRRService::Enabled(nsIRequest::TRRMode aRequestMode) {
if (mMode == nsIDNSService::MODE_TRROFF ||
aRequestMode == nsIRequest::TRR_DISABLED_MODE) {
LOG(("TRR service not enabled - off or disabled"));
return false;
}
// If already confirmed, service is enabled.
if (mConfirmation.State() == CONFIRM_OK ||
aRequestMode == nsIRequest::TRR_ONLY_MODE) {
LOG(("TRR service enabled - confirmed or trr_only request"));
return true;
}
// If this is a TRR_FIRST request but the resolver has a different mode,
// just go ahead and let it try to use TRR.
if (aRequestMode == nsIRequest::TRR_FIRST_MODE &&
mMode != nsIDNSService::MODE_TRRFIRST) {
LOG(("TRR service enabled - trr_first request"));
return true;
}
// In TRR_ONLY_MODE / confirmationNS == "skip" we don't try to confirm.
if (mConfirmation.State() == CONFIRM_DISABLED) {
LOG(("TRRService service enabled - confirmation is disabled"));
return true;
}
LOG(("TRRService::Enabled mConfirmation.mState=%d mCaptiveIsPassed=%d\n",
mConfirmation.State(), (int)mCaptiveIsPassed));
if (StaticPrefs::network_trr_wait_for_confirmation()) {
return mConfirmation.State() == CONFIRM_OK;
}
if (StaticPrefs::network_trr_attempt_when_retrying_confirmation()) {
return mConfirmation.State() == CONFIRM_OK ||
mConfirmation.State() == CONFIRM_TRYING_OK ||
mConfirmation.State() == CONFIRM_TRYING_FAILED;
}
return mConfirmation.State() == CONFIRM_OK ||
mConfirmation.State() == CONFIRM_TRYING_OK;
}
void TRRService::GetPrefBranch(nsIPrefBranch** result) {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
*result = nullptr;
CallGetService(NS_PREFSERVICE_CONTRACTID, result);
}
bool TRRService::MaybeSetPrivateURI(const nsACString& aURI) {
bool clearCache = false;
nsAutoCString newURI(aURI);
LOG(("MaybeSetPrivateURI(%s)", newURI.get()));
ProcessURITemplate(newURI);
{
MutexAutoLock lock(mLock);
if (mPrivateURI.Equals(newURI)) {
return false;
}
if (!mPrivateURI.IsEmpty()) {
LOG(("TRRService clearing blocklist because of change in uri service\n"));
auto bl = mTRRBLStorage.Lock();
bl->Clear();
clearCache = true;
}
nsCOMPtr<nsIURI> url;
nsresult rv =
NS_MutateURI(NS_STANDARDURLMUTATOR_CONTRACTID)
.Apply(NS_MutatorMethod(&nsIStandardURLMutator::Init,
nsIStandardURL::URLTYPE_STANDARD, 443,
newURI, nullptr, nullptr, nullptr))
.Finalize(url);
if (NS_FAILED(rv)) {
LOG(("TRRService::MaybeSetPrivateURI failed to create URI!\n"));
return false;
}
nsAutoCString host;
url->GetHost(host);
sDomainIndex = 0;
for (size_t i = 1; i < std::size(kTRRDomains); i++) {
if (host.Equals(kTRRDomains[i])) {
sDomainIndex = i;
break;
}
}
mPrivateURI = newURI;
// The URI has changed. We should trigger a new confirmation immediately.
// We must do this here because the URI could also change because of
// steering.
mConfirmation.HandleEvent(ConfirmationEvent::URIChange, lock);
}
// Clear the cache because we changed the URI
if (clearCache) {
ClearEntireCache();
}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, NS_NETWORK_TRR_URI_CHANGED_TOPIC, nullptr);
}
return true;
}
nsresult TRRService::ReadPrefs(const char* name) {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
// Whenever a pref change occurs that would cause us to clear the cache
// we set this to true then do it at the end of the method.
bool clearEntireCache = false;
if (!name || !strcmp(name, TRR_PREF("mode")) ||
!strcmp(name, kRolloutModePref)) {
nsIDNSService::ResolverMode prevMode = Mode();
OnTRRModeChange();
// When the TRR service gets disabled we should purge the TRR cache to
// make sure we don't use any of the cached entries on a network where
// they are invalid - for example after turning on a VPN.
if (TRR_DISABLED(Mode()) && !TRR_DISABLED(prevMode)) {
clearEntireCache = true;
}
}
if (!name || !strcmp(name, TRR_PREF("uri")) ||
!strcmp(name, TRR_PREF("default_provider_uri")) ||
!strcmp(name, kRolloutURIPref)) {
OnTRRURIChange();
}
if (!name || !strcmp(name, TRR_PREF("credentials"))) {
MutexAutoLock lock(mLock);
Preferences::GetCString(TRR_PREF("credentials"), mPrivateCred);
}
if (!name || !strcmp(name, TRR_PREF("confirmationNS"))) {
MutexAutoLock lock(mLock);
Preferences::GetCString(TRR_PREF("confirmationNS"), mConfirmationNS);
LOG(("confirmationNS = %s", mConfirmationNS.get()));
}
if (!name || !strcmp(name, TRR_PREF("bootstrapAddr"))) {
MutexAutoLock lock(mLock);
Preferences::GetCString(TRR_PREF("bootstrapAddr"), mBootstrapAddr);
clearEntireCache = true;
}
if (!name || !strcmp(name, TRR_PREF("blacklist-duration"))) {
// prefs is given in number of seconds
uint32_t secs;
if (NS_SUCCEEDED(
Preferences::GetUint(TRR_PREF("blacklist-duration"), &secs))) {
mBlocklistDurationSeconds = secs;
}
}
if (!name || !strcmp(name, kDisableIpv6Pref)) {
bool tmp;
if (NS_SUCCEEDED(Preferences::GetBool(kDisableIpv6Pref, &tmp))) {
mDisableIPv6 = tmp;
}
}
if (!name || !strcmp(name, TRR_PREF("excluded-domains")) ||
!strcmp(name, TRR_PREF("builtin-excluded-domains"))) {
MutexAutoLock lock(mLock);
mExcludedDomains.Clear();
auto parseExcludedDomains = [this](const char* aPrefName) {
nsAutoCString excludedDomains;
Preferences::GetCString(aPrefName, excludedDomains);
if (excludedDomains.IsEmpty()) {
return;
}
for (const nsACString& tokenSubstring :
nsCCharSeparatedTokenizerTemplate<
NS_IsAsciiWhitespace, nsTokenizerFlags::SeparatorOptional>(
excludedDomains, ',')
.ToRange()) {
nsCString token{tokenSubstring};
LOG(("TRRService::ReadPrefs %s host:[%s]\n", aPrefName, token.get()));
mExcludedDomains.Insert(token);
}
};
parseExcludedDomains(TRR_PREF("excluded-domains"));
parseExcludedDomains(TRR_PREF("builtin-excluded-domains"));
clearEntireCache = true;
}
// if name is null, then we're just now initializing. In that case we don't
// need to clear the cache.
if (name && clearEntireCache) {
ClearEntireCache();
}
return NS_OK;
}
void TRRService::ClearEntireCache() {
if (!StaticPrefs::network_trr_clear_cache_on_pref_change()) {
return;
}
nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID);
if (!dns) {
return;
}
dns->ClearCache(true);
}
void TRRService::AddEtcHosts(const nsTArray<nsCString>& aArray) {
MutexAutoLock lock(mLock);
for (const auto& item : aArray) {
LOG(("Adding %s from /etc/hosts to excluded domains", item.get()));
mEtcHostsDomains.Insert(item);
}
}
void TRRService::ReadEtcHostsFile() {
if (!StaticPrefs::network_trr_exclude_etc_hosts()) {
return;
}
auto readHostsTask = []() {
MOZ_ASSERT(!NS_IsMainThread(), "Must not run on the main thread");
#if defined(XP_WIN) && !defined(__MINGW32__)
// Inspired by libevent/evdns.c
// Windows is a little coy about where it puts its configuration
// files. Sure, they're _usually_ in C:\windows\system32, but
// there's no reason in principle they couldn't be in
// W:\hoboken chicken emergency
nsCString path;
path.SetLength(MAX_PATH + 1);
if (!SHGetSpecialFolderPathA(NULL, path.BeginWriting(), CSIDL_SYSTEM,
false)) {
LOG(("Calling SHGetSpecialFolderPathA failed"));
return;
}
path.SetLength(strlen(path.get()));
path.Append("\\drivers\\etc\\hosts");
#elif defined(__MINGW32__)
nsAutoCString path("C:\\windows\\system32\\drivers\\etc\\hosts"_ns);
#else
nsAutoCString path("/etc/hosts"_ns);
#endif
LOG(("Reading hosts file at %s", path.get()));
rust_parse_etc_hosts(&path, [](const nsTArray<nsCString>* aArray) -> bool {
RefPtr<TRRService> service(sTRRServicePtr);
if (service && aArray) {
service->AddEtcHosts(*aArray);
}
return !!service;
});
};
Unused << NS_DispatchBackgroundTask(
NS_NewRunnableFunction("Read /etc/hosts file", readHostsTask),
NS_DISPATCH_EVENT_MAY_BLOCK);
}
nsresult TRRService::GetURI(nsACString& result) {
MutexAutoLock lock(mLock);
result = mPrivateURI;
return NS_OK;
}
nsresult TRRService::GetCredentials(nsCString& result) {
MutexAutoLock lock(mLock);
result = mPrivateCred;
return NS_OK;
}
uint32_t TRRService::GetRequestTimeout() {
if (mMode == nsIDNSService::MODE_TRRONLY) {
return StaticPrefs::network_trr_request_timeout_mode_trronly_ms();
}
return StaticPrefs::network_trr_request_timeout_ms();
}
nsresult TRRService::Start() {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
if (!mInitialized) {
return NS_ERROR_NOT_INITIALIZED;
}
return NS_OK;
}
TRRService::~TRRService() {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
LOG(("Exiting TRRService\n"));
gTRRService = nullptr;
}
nsresult TRRService::DispatchTRRRequest(TRR* aTrrRequest) {
return DispatchTRRRequestInternal(aTrrRequest, true);
}
nsresult TRRService::DispatchTRRRequestInternal(TRR* aTrrRequest,
bool aWithLock) {
NS_ENSURE_ARG_POINTER(aTrrRequest);
nsCOMPtr<nsIThread> thread = MainThreadOrTRRThread(aWithLock);
if (!thread) {
return NS_ERROR_FAILURE;
}
RefPtr<TRR> trr = aTrrRequest;
return thread->Dispatch(trr.forget());
}
already_AddRefed<nsIThread> TRRService::MainThreadOrTRRThread(bool aWithLock) {
if (!StaticPrefs::network_trr_fetch_off_main_thread() ||
XRE_IsSocketProcess()) {
return do_GetMainThread();
}
nsCOMPtr<nsIThread> thread = aWithLock ? TRRThread() : TRRThread_locked();
return thread.forget();
}
already_AddRefed<nsIThread> TRRService::TRRThread() {
MutexAutoLock lock(mLock);
return TRRThread_locked();
}
already_AddRefed<nsIThread> TRRService::TRRThread_locked() {
RefPtr<nsIThread> thread = sTRRBackgroundThread;
return thread.forget();
}
bool TRRService::IsOnTRRThread() {
nsCOMPtr<nsIThread> thread;
{
MutexAutoLock lock(mLock);
thread = sTRRBackgroundThread;
}
if (!thread) {
return false;
}
return thread->IsOnCurrentThread();
}
NS_IMETHODIMP
TRRService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
LOG(("TRR::Observe() topic=%s\n", aTopic));
if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
auto prevConf = mConfirmation.TaskAddr();
ReadPrefs(NS_ConvertUTF16toUTF8(aData).get());
mConfirmation.RecordEvent("pref-change");
// We should only trigger a new confirmation if reading the prefs didn't
// already trigger one.
if (prevConf == mConfirmation.TaskAddr()) {
mConfirmation.HandleEvent(ConfirmationEvent::PrefChange);
}
} else if (!strcmp(aTopic, kOpenCaptivePortalLoginEvent)) {
// We are in a captive portal
LOG(("TRRservice in captive portal\n"));
mCaptiveIsPassed = false;
mConfirmation.SetCaptivePortalStatus(
nsICaptivePortalService::LOCKED_PORTAL);
} else if (!strcmp(aTopic, NS_CAPTIVE_PORTAL_CONNECTIVITY)) {
nsAutoCString data = NS_ConvertUTF16toUTF8(aData);
LOG(("TRRservice captive portal was %s\n", data.get()));
nsCOMPtr<nsICaptivePortalService> cps = do_QueryInterface(aSubject);
if (cps) {
mConfirmation.SetCaptivePortalStatus(cps->State());
}
// If we were previously in a captive portal, this event means we will
// need to trigger confirmation again. Otherwise it's just a periodical
// captive-portal check that completed and we don't need to react to it.
if (!mCaptiveIsPassed) {
mConfirmation.HandleEvent(ConfirmationEvent::CaptivePortalConnectivity);
}
mCaptiveIsPassed = true;
} else if (!strcmp(aTopic, kClearPrivateData) || !strcmp(aTopic, kPurge)) {
// flush the TRR blocklist
auto bl = mTRRBLStorage.Lock();
bl->Clear();
} else if (!strcmp(aTopic, NS_DNS_SUFFIX_LIST_UPDATED_TOPIC) ||
!strcmp(aTopic, NS_NETWORK_LINK_TOPIC)) {
// nsINetworkLinkService is only available on parent process.
if (XRE_IsParentProcess()) {
nsCOMPtr<nsINetworkLinkService> link = do_QueryInterface(aSubject);
// The network link service notification normally passes itself as the
// subject, but some unit tests will sometimes pass a null subject.
if (link) {
nsTArray<nsCString> suffixList;
link->GetDnsSuffixList(suffixList);
RebuildSuffixList(std::move(suffixList));
}
}
if (!strcmp(aTopic, NS_NETWORK_LINK_TOPIC)) {
if (NS_ConvertUTF16toUTF8(aData).EqualsLiteral(
NS_NETWORK_LINK_DATA_DOWN)) {
mConfirmation.RecordEvent("network-change");
}
if (mURISetByDetection) {
// If the URI was set via SetDetectedTrrURI we need to restore it to the
// default pref when a network link change occurs.
CheckURIPrefs();
}
if (NS_ConvertUTF16toUTF8(aData).EqualsLiteral(NS_NETWORK_LINK_DATA_UP)) {
mConfirmation.HandleEvent(ConfirmationEvent::NetworkUp);
}
}
} else if (!strcmp(aTopic, "xpcom-shutdown-threads")) {
// If a confirmation is still in progress we record the event.
// Since there should be no more confirmations after this, the shutdown
// reason would not really be recorded in telemetry.
mConfirmation.RecordEvent("shutdown");
if (sTRRBackgroundThread) {
nsCOMPtr<nsIThread> thread;
{
MutexAutoLock lock(mLock);
thread = sTRRBackgroundThread.get();
sTRRBackgroundThread = nullptr;
}
MOZ_ALWAYS_SUCCEEDS(thread->Shutdown());
sTRRServicePtr = nullptr;
}
}
return NS_OK;
}
void TRRService::RebuildSuffixList(nsTArray<nsCString>&& aSuffixList) {
if (!StaticPrefs::network_trr_split_horizon_mitigations()) {
return;
}
MutexAutoLock lock(mLock);
mDNSSuffixDomains.Clear();
for (const auto& item : aSuffixList) {
LOG(("TRRService adding %s to suffix list", item.get()));
mDNSSuffixDomains.Insert(item);
}
}
void TRRService::ConfirmationContext::HandleEvent(ConfirmationEvent aEvent) {
MutexAutoLock lock(OwningObject()->mLock);
HandleEvent(aEvent, lock);
}
void TRRService::ConfirmationContext::HandleEvent(ConfirmationEvent aEvent,
const MutexAutoLock&) {
TRRService* service = OwningObject();
service->mLock.AssertCurrentThreadOwns();
nsIDNSService::ResolverMode mode = service->Mode();
auto resetConfirmation = [&]() {
mTask = nullptr;
nsCOMPtr<nsITimer> timer = std::move(mTimer);
if (timer) {
timer->Cancel();
}
mRetryInterval = StaticPrefs::network_trr_retry_timeout_ms();
mTRRFailures = 0;
if (TRR_DISABLED(mode)) {
LOG(("TRR is disabled. mConfirmation.mState -> CONFIRM_OFF"));
mState = CONFIRM_OFF;
return;
}
if (mode == nsIDNSService::MODE_TRRONLY) {
LOG(("TRR_ONLY_MODE. mConfirmation.mState -> CONFIRM_DISABLED"));
mState = CONFIRM_DISABLED;
return;
}
if (service->mConfirmationNS.Equals("skip"_ns)) {
LOG((
"mConfirmationNS == skip. mConfirmation.mState -> CONFIRM_DISABLED"));
mState = CONFIRM_DISABLED;
return;
}
// The next call to maybeConfirm will transition to CONFIRM_TRYING_OK
LOG(("mConfirmation.mState -> CONFIRM_OK"));
mState = CONFIRM_OK;
};
auto maybeConfirm = [&](const char* aReason) {
if (TRR_DISABLED(mode) || mState == CONFIRM_DISABLED || mTask) {
LOG(
("TRRService:MaybeConfirm(%s) mode=%d, mTask=%p "
"mState=%d\n",
aReason, (int)mode, (void*)mTask, (int)mState));
return;
}
MOZ_ASSERT(mode != nsIDNSService::MODE_TRRONLY,
"Confirmation should be disabled");
MOZ_ASSERT(!service->mConfirmationNS.Equals("skip"),
"Confirmation should be disabled");
LOG(("maybeConfirm(%s) starting confirmation test %s %s\n", aReason,
service->mPrivateURI.get(), service->mConfirmationNS.get()));
MOZ_ASSERT(mState == CONFIRM_OK || mState == CONFIRM_FAILED);
if (mState == CONFIRM_FAILED) {
LOG(("mConfirmation.mState -> CONFIRM_TRYING_FAILED"));
mState = CONFIRM_TRYING_FAILED;
} else {
LOG(("mConfirmation.mState -> CONFIRM_TRYING_OK"));
mState = CONFIRM_TRYING_OK;
}
nsCOMPtr<nsITimer> timer = std::move(mTimer);
if (timer) {
timer->Cancel();
}
MOZ_ASSERT(mode == nsIDNSService::MODE_TRRFIRST,
"Should only confirm in TRR first mode");
mTask =
new TRR(service, service->mConfirmationNS, TRRTYPE_NS, ""_ns, false);
mTask->SetTimeout(StaticPrefs::network_trr_confirmation_timeout_ms());
mTask->SetPurpose(TRR::Confirmation);
if (service->mLinkService) {
service->mLinkService->GetNetworkID(mNetworkId);
}
if (mFirstRequestTime.IsNull()) {
mFirstRequestTime = TimeStamp::Now();
}
if (mTrigger.IsEmpty()) {
mTrigger.Assign(aReason);
}
LOG(("Dispatching confirmation task: %p", mTask.get()));
service->DispatchTRRRequestInternal(mTask, false);
};
switch (aEvent) {
case ConfirmationEvent::Init:
resetConfirmation();
maybeConfirm("context-init");
break;
case ConfirmationEvent::PrefChange:
resetConfirmation();
maybeConfirm("pref-change");
break;
case ConfirmationEvent::Retry:
MOZ_ASSERT(mState == CONFIRM_FAILED);
if (mState == CONFIRM_FAILED) {
maybeConfirm("retry");
}
break;
case ConfirmationEvent::FailedLookups:
MOZ_ASSERT(mState == CONFIRM_OK);
maybeConfirm("failed-lookups");
break;
case ConfirmationEvent::URIChange:
resetConfirmation();
maybeConfirm("uri-change");
break;
case ConfirmationEvent::CaptivePortalConnectivity:
// If we area already confirmed then we're fine.
// If there is a confirmation in progress, likely it started before
// we had full connectivity, so it may be hanging. We reset and try again.
if (mState == CONFIRM_FAILED || mState == CONFIRM_TRYING_FAILED ||
mState == CONFIRM_TRYING_OK) {
resetConfirmation();
maybeConfirm("cp-connectivity");
}
break;
case ConfirmationEvent::NetworkUp:
if (mState != CONFIRM_OK) {
resetConfirmation();
maybeConfirm("network-up");
}
break;
case ConfirmationEvent::ConfirmOK:
mState = CONFIRM_OK;
mTask = nullptr;
break;
case ConfirmationEvent::ConfirmFail:
MOZ_ASSERT(mState == CONFIRM_TRYING_OK ||
mState == CONFIRM_TRYING_FAILED);
mState = CONFIRM_FAILED;
mTask = nullptr;
// retry failed NS confirmation
NS_NewTimerWithCallback(getter_AddRefs(mTimer), this, mRetryInterval,
nsITimer::TYPE_ONE_SHOT);
if (mRetryInterval < 64000) {
// double the interval up to this point
mRetryInterval *= 2;
}
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected ConfirmationEvent");
}
}
bool TRRService::MaybeBootstrap(const nsACString& aPossible,
nsACString& aResult) {
MutexAutoLock lock(mLock);
if (mMode == nsIDNSService::MODE_TRROFF || mBootstrapAddr.IsEmpty()) {
return false;
}
nsCOMPtr<nsIURI> url;
nsresult rv =
NS_MutateURI(NS_STANDARDURLMUTATOR_CONTRACTID)
.Apply(NS_MutatorMethod(&nsIStandardURLMutator::Init,
nsIStandardURL::URLTYPE_STANDARD, 443,
mPrivateURI, nullptr, nullptr, nullptr))
.Finalize(url);
if (NS_FAILED(rv)) {
LOG(("TRRService::MaybeBootstrap failed to create URI!\n"));
return false;
}
nsAutoCString host;
url->GetHost(host);
if (!aPossible.Equals(host)) {
return false;
}
LOG(("TRRService::MaybeBootstrap: use %s instead of %s\n",
mBootstrapAddr.get(), host.get()));
aResult = mBootstrapAddr;
return true;
}
bool TRRService::IsDomainBlocked(const nsACString& aHost,
const nsACString& aOriginSuffix,
bool aPrivateBrowsing) {
auto bl = mTRRBLStorage.Lock();
if (bl->IsEmpty()) {
return false;
}
// use a unified casing for the hashkey
nsAutoCString hashkey(aHost + aOriginSuffix);
if (auto val = bl->Lookup(hashkey)) {
int32_t until = *val + mBlocklistDurationSeconds;
int32_t expire = NowInSeconds();
if (until > expire) {
LOG(("Host [%s] is TRR blocklisted\n", nsCString(aHost).get()));
return true;
}
// the blocklisted entry has expired
val.Remove();
}
return false;
}
// When running in TRR-only mode, the blocklist is not used and it will also
// try resolving the localhost / .local names.
bool TRRService::IsTemporarilyBlocked(const nsACString& aHost,
const nsACString& aOriginSuffix,
bool aPrivateBrowsing,
bool aParentsToo) // false if domain
{
if (mMode == nsIDNSService::MODE_TRRONLY) {
return false; // might as well try
}
LOG(("Checking if host [%s] is blocklisted", aHost.BeginReading()));
int32_t dot = aHost.FindChar('.');
if ((dot == kNotFound) && aParentsToo) {
// Only if a full host name. Domains can be dotless to be able to
// blocklist entire TLDs
return true;
}
if (IsDomainBlocked(aHost, aOriginSuffix, aPrivateBrowsing)) {
return true;
}
nsDependentCSubstring domain = Substring(aHost, 0);
while (dot != kNotFound) {
dot++;
domain.Rebind(domain, dot, domain.Length() - dot);
if (IsDomainBlocked(domain, aOriginSuffix, aPrivateBrowsing)) {
return true;
}
dot = domain.FindChar('.');
}
return false;
}
bool TRRService::IsExcludedFromTRR(const nsACString& aHost) {
// This method may be called off the main thread. We need to lock so
// mExcludedDomains and mDNSSuffixDomains don't change while this code
// is running.
MutexAutoLock lock(mLock);
return IsExcludedFromTRR_unlocked(aHost);
}
bool TRRService::IsExcludedFromTRR_unlocked(const nsACString& aHost) {
if (!NS_IsMainThread()) {
mLock.AssertCurrentThreadOwns();
}
int32_t dot = 0;
// iteratively check the sub-domain of |aHost|
while (dot < static_cast<int32_t>(aHost.Length())) {
nsDependentCSubstring subdomain =
Substring(aHost, dot, aHost.Length() - dot);
if (mExcludedDomains.Contains(subdomain)) {
LOG(("Subdomain [%s] of host [%s] Is Excluded From TRR via pref\n",
subdomain.BeginReading(), aHost.BeginReading()));
return true;
}
if (mDNSSuffixDomains.Contains(subdomain)) {
LOG(("Subdomain [%s] of host [%s] Is Excluded From TRR via pref\n",
subdomain.BeginReading(), aHost.BeginReading()));
return true;
}
if (mEtcHostsDomains.Contains(subdomain)) {
LOG(("Subdomain [%s] of host [%s] Is Excluded From TRR by /etc/hosts\n",
subdomain.BeginReading(), aHost.BeginReading()));
return true;
}
dot = aHost.FindChar('.', dot + 1);
if (dot == kNotFound) {
break;
}
dot++;
}
return false;
}
void TRRService::AddToBlocklist(const nsACString& aHost,
const nsACString& aOriginSuffix,
bool privateBrowsing, bool aParentsToo) {
LOG(("TRR blocklist %s\n", nsCString(aHost).get()));
nsAutoCString hashkey(aHost + aOriginSuffix);
// this overwrites any existing entry
{
auto bl = mTRRBLStorage.Lock();
bl->InsertOrUpdate(hashkey, NowInSeconds());
}
// See bug 1700405. Some test expects 15 trr consecutive failures, but the NS
// check against the base domain is successful. So, we skip this NS check when
// the pref said so in order to pass the test reliably.
if (aParentsToo && !StaticPrefs::network_trr_skip_check_for_blocked_host()) {
// when given a full host name, verify its domain as well
int32_t dot = aHost.FindChar('.');
if (dot != kNotFound) {
// this has a domain to be checked
dot++;
nsDependentCSubstring domain =
Substring(aHost, dot, aHost.Length() - dot);
nsAutoCString check(domain);
if (IsTemporarilyBlocked(check, aOriginSuffix, privateBrowsing, false)) {
// the domain part is already blocklisted, no need to add this entry
return;
}
// verify 'check' over TRR
LOG(("TRR: verify if '%s' resolves as NS\n", check.get()));
// check if there's an NS entry for this name
RefPtr<TRR> trr =
new TRR(this, check, TRRTYPE_NS, aOriginSuffix, privateBrowsing);
trr->SetPurpose(TRR::Blocklist);
DispatchTRRRequest(trr);
}
}
}
NS_IMETHODIMP
TRRService::ConfirmationContext::Notify(nsITimer* aTimer) {
MutexAutoLock lock(OwningObject()->mLock);
if (aTimer == mTimer) {
HandleEvent(ConfirmationEvent::Retry, lock);
return NS_OK;
}
MOZ_CRASH("Unknown timer");
return NS_OK;
}
static char StatusToChar(nsresult aLookupStatus, nsresult aChannelStatus) {
// If the resolution fails in the TRR channel then we'll have a failed
// aChannelStatus. Otherwise, we parse the response - if it's not a valid DNS
// packet or doesn't contain the correct responses aLookupStatus will be a
// failure code.
if (aChannelStatus == NS_OK) {
// Return + if confirmation was OK, or - if confirmation failed
return aLookupStatus == NS_OK ? '+' : '-';
}
if (nsCOMPtr<nsIIOService> ios = do_GetIOService()) {
bool hasConnectiviy = true;
ios->GetConnectivity(&hasConnectiviy);
if (!hasConnectiviy) {
// Browser has no active network interfaces = is offline.
return 'o';
}
}
switch (aChannelStatus) {
case NS_ERROR_NET_TIMEOUT_EXTERNAL:
// TRR timeout expired
return 't';
case NS_ERROR_UNKNOWN_HOST:
// TRRServiceChannel failed to due to unresolved host
return 'd';
default:
break;
}
// The error is a network error
if (NS_ERROR_GET_MODULE(aChannelStatus) == NS_ERROR_MODULE_NETWORK) {
return 'n';
}
// Some other kind of failure.
return '?';
}
void TRRService::RecordTRRStatus(nsresult aChannelStatus) {
MOZ_ASSERT_IF(XRE_IsParentProcess(), NS_IsMainThread() || IsOnTRRThread());
MOZ_ASSERT_IF(XRE_IsSocketProcess(), NS_IsMainThread());
Telemetry::AccumulateCategoricalKeyed(
ProviderKey(), NS_SUCCEEDED(aChannelStatus)
? Telemetry::LABELS_DNS_TRR_SUCCESS3::Fine
: (aChannelStatus == NS_ERROR_NET_TIMEOUT_EXTERNAL
? Telemetry::LABELS_DNS_TRR_SUCCESS3::Timeout
: Telemetry::LABELS_DNS_TRR_SUCCESS3::Bad));
mConfirmation.RecordTRRStatus(aChannelStatus);
}
void TRRService::ConfirmationContext::RecordTRRStatus(nsresult aChannelStatus) {
if (NS_SUCCEEDED(aChannelStatus)) {
LOG(("TRRService::RecordTRRStatus channel success"));
mTRRFailures = 0;
return;
}
if (OwningObject()->Mode() != nsIDNSService::MODE_TRRFIRST) {
return;
}
// only count failures while in OK state
if (State() != CONFIRM_OK) {
return;
}
mFailureReasons[mTRRFailures % ConfirmationContext::RESULTS_SIZE] =
StatusToChar(NS_OK, aChannelStatus);
uint32_t fails = ++mTRRFailures;
LOG(("TRRService::RecordTRRStatus fails=%u", fails));
if (fails >= StaticPrefs::network_trr_max_fails()) {
LOG(("TRRService had %u failures in a row\n", fails));
// When several failures occur we trigger a confirmation causing
// us to transition into the CONFIRM_TRYING_OK state.
// Only after the confirmation fails do we finally go into CONFIRM_FAILED
// and start skipping TRR.
mTrigger.Assign("failed-lookups");
mFailedLookups = nsDependentCSubstring(
mFailureReasons, fails % ConfirmationContext::RESULTS_SIZE);
// Trigger a confirmation immediately.
// If it fails, it will fire off a timer to start retrying again.
HandleEvent(ConfirmationEvent::FailedLookups);
}
}
void TRRService::ConfirmationContext::RecordEvent(const char* aReason) {
// Reset the confirmation context attributes
// Only resets the attributes that we keep for telemetry purposes.
auto reset = [&]() {
mAttemptCount = 0;
mNetworkId.Truncate();
mFirstRequestTime = TimeStamp();
mContextChangeReason.Assign(aReason);
mTrigger.Truncate();
mFailedLookups.Truncate();
mRetryInterval = StaticPrefs::network_trr_retry_timeout_ms();
};
if (mAttemptCount == 0) {
// XXX: resetting everything might not be the best thing here, even if the
// context changes, because there might still be a confirmation pending.
// But cancelling and retrying that confirmation might just make the whole
// confirmation longer for no reason.
reset();
return;
}
Telemetry::EventID eventType =
Telemetry::EventID::NetworkDns_Trrconfirmation_Context;
nsAutoCString results;
static_assert(RESULTS_SIZE < 64);
// mResults is a circular buffer ending at mAttemptCount
if (mAttemptCount <= RESULTS_SIZE) {
// We have fewer attempts than the size of the buffer, so all of the
// results are in the buffer.
results.Append(nsDependentCSubstring(mResults, mAttemptCount));
} else {
// More attempts than the buffer size.
// That means past RESULTS_SIZE attempts in order are
// [posInResults .. end-of-buffer) + [start-of-buffer .. posInResults)
uint32_t posInResults = mAttemptCount % RESULTS_SIZE;
results.Append(nsDependentCSubstring(mResults + posInResults,
RESULTS_SIZE - posInResults));
results.Append(nsDependentCSubstring(mResults, posInResults));
}
auto extra = Some<nsTArray<mozilla::Telemetry::EventExtraEntry>>({
Telemetry::EventExtraEntry{"trigger"_ns, mTrigger},
Telemetry::EventExtraEntry{"contextReason"_ns, mContextChangeReason},
Telemetry::EventExtraEntry{"attemptCount"_ns,
nsPrintfCString("%u", mAttemptCount)},
Telemetry::EventExtraEntry{"results"_ns, results},
Telemetry::EventExtraEntry{
"time"_ns,
nsPrintfCString(
"%f",
!mFirstRequestTime.IsNull()
? (TimeStamp::Now() - mFirstRequestTime).ToMilliseconds()
: 0.0)},
Telemetry::EventExtraEntry{"networkID"_ns, mNetworkId},
Telemetry::EventExtraEntry{"captivePortal"_ns,
nsPrintfCString("%i", mCaptivePortalStatus)},
});
if (mTrigger.Equals("failed-lookups"_ns)) {
extra.ref().AppendElement(
Telemetry::EventExtraEntry{"failedLookups"_ns, mFailedLookups});
}
enum ConfirmationState state = mState;
Telemetry::RecordEvent(eventType, mozilla::Some(nsPrintfCString("%u", state)),
extra);
reset();
}
void TRRService::ConfirmationContext::RequestCompleted(
nsresult aLookupStatus, nsresult aChannelStatus) {
mResults[mAttemptCount % RESULTS_SIZE] =
StatusToChar(aLookupStatus, aChannelStatus);
mAttemptCount++;
}
void TRRService::ConfirmationContext::CompleteConfirmation(nsresult aStatus,
TRR* aTRRRequest) {
{
MutexAutoLock lock(OwningObject()->mLock);
// Ignore confirmations that dont match the pending task.
if (mTask != aTRRRequest) {
return;
}
MOZ_ASSERT(State() == CONFIRM_TRYING_OK ||
State() == CONFIRM_TRYING_FAILED);
if (State() != CONFIRM_TRYING_OK && State() != CONFIRM_TRYING_FAILED) {
return;
}
RequestCompleted(aStatus, aTRRRequest->ChannelStatus());
MOZ_ASSERT(mTask);
if (NS_SUCCEEDED(aStatus)) {
HandleEvent(ConfirmationEvent::ConfirmOK, lock);
} else {
HandleEvent(ConfirmationEvent::ConfirmFail, lock);
}
LOG(("TRRService finishing confirmation test %s %d %X\n",
OwningObject()->mPrivateURI.get(), State(), (unsigned int)aStatus));
}
if (State() == CONFIRM_OK) {
// Record event and start new confirmation context
RecordEvent("success");
// A fresh confirmation means previous blocked entries might not
// be valid anymore.
auto bl = OwningObject()->mTRRBLStorage.Lock();
bl->Clear();
} else {
MOZ_ASSERT(State() == CONFIRM_FAILED);
}
Telemetry::Accumulate(Telemetry::DNS_TRR_NS_VERFIFIED3,
TRRService::ProviderKey(), (State() == CONFIRM_OK));
}
AHostResolver::LookupStatus TRRService::CompleteLookup(
nsHostRecord* rec, nsresult status, AddrInfo* aNewRRSet, bool pb,
const nsACString& aOriginSuffix, TRRSkippedReason aReason,
TRR* aTRRRequest) {
// this is an NS check for the TRR blocklist or confirmationNS check
MOZ_ASSERT_IF(XRE_IsParentProcess(), NS_IsMainThread() || IsOnTRRThread());
MOZ_ASSERT_IF(XRE_IsSocketProcess(), NS_IsMainThread());
MOZ_ASSERT(!rec);
RefPtr<AddrInfo> newRRSet(aNewRRSet);
MOZ_ASSERT(newRRSet && newRRSet->TRRType() == TRRTYPE_NS);
if (aTRRRequest->Purpose() == TRR::Confirmation) {
mConfirmation.CompleteConfirmation(status, aTRRRequest);
return LOOKUP_OK;
}
if (aTRRRequest->Purpose() == TRR::Blocklist) {
if (NS_SUCCEEDED(status)) {
LOG(("TRR verified %s to be fine!\n", newRRSet->Hostname().get()));
} else {
LOG(("TRR says %s doesn't resolve as NS!\n", newRRSet->Hostname().get()));
AddToBlocklist(newRRSet->Hostname(), aOriginSuffix, pb, false);
}
return LOOKUP_OK;
}
MOZ_ASSERT_UNREACHABLE(
"TRRService::CompleteLookup called for unexpected request");
return LOOKUP_OK;
}
AHostResolver::LookupStatus TRRService::CompleteLookupByType(
nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
uint32_t aTtl, bool aPb) {
return LOOKUP_OK;
}
} // namespace net
} // namespace mozilla
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