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-rw-r--r--netwerk/dns/TRR.cpp1110
1 files changed, 1110 insertions, 0 deletions
diff --git a/netwerk/dns/TRR.cpp b/netwerk/dns/TRR.cpp
new file mode 100644
index 0000000000..3bfc892c65
--- /dev/null
+++ b/netwerk/dns/TRR.cpp
@@ -0,0 +1,1110 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=4 sw=2 sts=2 et cin: */
+/* 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 "DNS.h"
+#include "DNSUtils.h"
+#include "nsCharSeparatedTokenizer.h"
+#include "nsContentUtils.h"
+#include "nsHttpHandler.h"
+#include "nsHttpChannel.h"
+#include "nsHostResolver.h"
+#include "nsIHttpChannel.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIIOService.h"
+#include "nsIInputStream.h"
+#include "nsIObliviousHttp.h"
+#include "nsISupports.h"
+#include "nsISupportsUtils.h"
+#include "nsITimedChannel.h"
+#include "nsIUploadChannel2.h"
+#include "nsIURIMutator.h"
+#include "nsNetUtil.h"
+#include "nsQueryObject.h"
+#include "nsStringStream.h"
+#include "nsThreadUtils.h"
+#include "nsURLHelper.h"
+#include "ObliviousHttpChannel.h"
+#include "TRR.h"
+#include "TRRService.h"
+#include "TRRServiceChannel.h"
+#include "TRRLoadInfo.h"
+
+#include "mozilla/Base64.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Tokenizer.h"
+#include "mozilla/UniquePtr.h"
+// Put DNSLogging.h at the end to avoid LOG being overwritten by other headers.
+#include "DNSLogging.h"
+
+namespace mozilla {
+namespace net {
+
+NS_IMPL_ISUPPORTS(TRR, nsIHttpPushListener, nsIInterfaceRequestor,
+ nsIStreamListener, nsIRunnable, nsITimerCallback)
+
+// when firing off a normal A or AAAA query
+TRR::TRR(AHostResolver* aResolver, nsHostRecord* aRec, enum TrrType aType)
+ : mozilla::Runnable("TRR"),
+ mRec(aRec),
+ mHostResolver(aResolver),
+ mType(aType),
+ mOriginSuffix(aRec->originSuffix) {
+ mHost = aRec->host;
+ mPB = aRec->pb;
+ MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess() || XRE_IsSocketProcess(),
+ "TRR must be in parent or socket process");
+}
+
+// when following CNAMEs
+TRR::TRR(AHostResolver* aResolver, nsHostRecord* aRec, nsCString& aHost,
+ enum TrrType& aType, unsigned int aLoopCount, bool aPB)
+ : mozilla::Runnable("TRR"),
+ mHost(aHost),
+ mRec(aRec),
+ mHostResolver(aResolver),
+ mType(aType),
+ mPB(aPB),
+ mCnameLoop(aLoopCount),
+ mOriginSuffix(aRec ? aRec->originSuffix : ""_ns) {
+ MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess() || XRE_IsSocketProcess(),
+ "TRR must be in parent or socket process");
+}
+
+// used on push
+TRR::TRR(AHostResolver* aResolver, bool aPB)
+ : mozilla::Runnable("TRR"), mHostResolver(aResolver), mPB(aPB) {
+ MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess() || XRE_IsSocketProcess(),
+ "TRR must be in parent or socket process");
+}
+
+// to verify a domain
+TRR::TRR(AHostResolver* aResolver, nsACString& aHost, enum TrrType aType,
+ const nsACString& aOriginSuffix, bool aPB, bool aUseFreshConnection)
+ : mozilla::Runnable("TRR"),
+ mHost(aHost),
+ mRec(nullptr),
+ mHostResolver(aResolver),
+ mType(aType),
+ mPB(aPB),
+ mOriginSuffix(aOriginSuffix),
+ mUseFreshConnection(aUseFreshConnection) {
+ MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess() || XRE_IsSocketProcess(),
+ "TRR must be in parent or socket process");
+}
+
+void TRR::HandleTimeout() {
+ mTimeout = nullptr;
+ RecordReason(TRRSkippedReason::TRR_TIMEOUT);
+ Cancel(NS_ERROR_NET_TIMEOUT_EXTERNAL);
+}
+
+NS_IMETHODIMP
+TRR::Notify(nsITimer* aTimer) {
+ if (aTimer == mTimeout) {
+ HandleTimeout();
+ } else {
+ MOZ_CRASH("Unknown timer");
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+TRR::Run() {
+ MOZ_ASSERT_IF(XRE_IsParentProcess() && TRRService::Get(),
+ NS_IsMainThread() || TRRService::Get()->IsOnTRRThread());
+ MOZ_ASSERT_IF(XRE_IsSocketProcess(), NS_IsMainThread());
+
+ if ((TRRService::Get() == nullptr) || NS_FAILED(SendHTTPRequest())) {
+ RecordReason(TRRSkippedReason::TRR_SEND_FAILED);
+ FailData(NS_ERROR_FAILURE);
+ // The dtor will now be run
+ }
+ return NS_OK;
+}
+
+DNSPacket* TRR::GetOrCreateDNSPacket() {
+ if (!mPacket) {
+ mPacket = MakeUnique<DNSPacket>();
+ }
+
+ return mPacket.get();
+}
+
+nsresult TRR::CreateQueryURI(nsIURI** aOutURI) {
+ nsAutoCString uri;
+ nsCOMPtr<nsIURI> dnsURI;
+ if (UseDefaultServer()) {
+ TRRService::Get()->GetURI(uri);
+ } else {
+ uri = mRec->mTrrServer;
+ }
+
+ nsresult rv = NS_NewURI(getter_AddRefs(dnsURI), uri);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ dnsURI.forget(aOutURI);
+ return NS_OK;
+}
+
+bool TRR::MaybeBlockRequest() {
+ if (((mType == TRRTYPE_A) || (mType == TRRTYPE_AAAA)) &&
+ mRec->mEffectiveTRRMode != nsIRequest::TRR_ONLY_MODE) {
+ // let NS resolves skip the blocklist check
+ // we also don't check the blocklist for TRR only requests
+ MOZ_ASSERT(mRec);
+
+ // If TRRService isn't enabled anymore for the req, don't do TRR.
+ if (!TRRService::Get()->Enabled(mRec->mEffectiveTRRMode)) {
+ RecordReason(TRRSkippedReason::TRR_MODE_NOT_ENABLED);
+ return true;
+ }
+
+ if (!StaticPrefs::network_trr_strict_native_fallback() &&
+ UseDefaultServer() &&
+ TRRService::Get()->IsTemporarilyBlocked(mHost, mOriginSuffix, mPB,
+ true)) {
+ if (mType == TRRTYPE_A) {
+ // count only blocklist for A records to avoid double counts
+ Telemetry::Accumulate(Telemetry::DNS_TRR_BLACKLISTED3,
+ TRRService::ProviderKey(), true);
+ }
+
+ RecordReason(TRRSkippedReason::TRR_HOST_BLOCKED_TEMPORARY);
+ // not really an error but no TRR is issued
+ return true;
+ }
+
+ if (TRRService::Get()->IsExcludedFromTRR(mHost)) {
+ RecordReason(TRRSkippedReason::TRR_EXCLUDED);
+ return true;
+ }
+
+ if (UseDefaultServer() && (mType == TRRTYPE_A)) {
+ Telemetry::Accumulate(Telemetry::DNS_TRR_BLACKLISTED3,
+ TRRService::ProviderKey(), false);
+ }
+ }
+
+ return false;
+}
+
+nsresult TRR::SendHTTPRequest() {
+ // This is essentially the "run" method - created from nsHostResolver
+ if (mCancelled) {
+ return NS_ERROR_FAILURE;
+ }
+
+ if ((mType != TRRTYPE_A) && (mType != TRRTYPE_AAAA) &&
+ (mType != TRRTYPE_NS) && (mType != TRRTYPE_TXT) &&
+ (mType != TRRTYPE_HTTPSSVC)) {
+ // limit the calling interface because nsHostResolver has explicit slots for
+ // these types
+ return NS_ERROR_FAILURE;
+ }
+
+ if (MaybeBlockRequest()) {
+ return NS_ERROR_UNKNOWN_HOST;
+ }
+
+ LOG(("TRR::SendHTTPRequest resolve %s type %u\n", mHost.get(), mType));
+
+ nsAutoCString body;
+ bool disableECS = StaticPrefs::network_trr_disable_ECS();
+ nsresult rv =
+ GetOrCreateDNSPacket()->EncodeRequest(body, mHost, mType, disableECS);
+ if (NS_FAILED(rv)) {
+ HandleEncodeError(rv);
+ return rv;
+ }
+
+ bool useGet = StaticPrefs::network_trr_useGET();
+ nsCOMPtr<nsIURI> dnsURI;
+ rv = CreateQueryURI(getter_AddRefs(dnsURI));
+ if (NS_FAILED(rv)) {
+ LOG(("TRR:SendHTTPRequest: NewURI failed!\n"));
+ return rv;
+ }
+
+ if (useGet) {
+ /* For GET requests, the outgoing packet needs to be Base64url-encoded and
+ then appended to the end of the URI. */
+ nsAutoCString encoded;
+ rv = Base64URLEncode(body.Length(),
+ reinterpret_cast<const unsigned char*>(body.get()),
+ Base64URLEncodePaddingPolicy::Omit, encoded);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsAutoCString query;
+ rv = dnsURI->GetQuery(query);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (query.IsEmpty()) {
+ query.Assign("?dns="_ns);
+ } else {
+ query.Append("&dns="_ns);
+ }
+ query.Append(encoded);
+
+ rv = NS_MutateURI(dnsURI).SetQuery(query).Finalize(dnsURI);
+ LOG(("TRR::SendHTTPRequest GET dns=%s\n", body.get()));
+ }
+
+ nsCOMPtr<nsIChannel> channel;
+ bool useOHTTP = StaticPrefs::network_trr_use_ohttp();
+ if (useOHTTP) {
+ nsCOMPtr<nsIObliviousHttpService> ohttpService(
+ do_GetService("@mozilla.org/network/oblivious-http-service;1"));
+ if (!ohttpService) {
+ return NS_ERROR_FAILURE;
+ }
+ nsCOMPtr<nsIURI> relayURI;
+ nsTArray<uint8_t> encodedConfig;
+ rv = ohttpService->GetTRRSettings(getter_AddRefs(relayURI), encodedConfig);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (!relayURI) {
+ return NS_ERROR_FAILURE;
+ }
+ rv = ohttpService->NewChannel(relayURI, dnsURI, encodedConfig,
+ getter_AddRefs(channel));
+ } else {
+ rv = DNSUtils::CreateChannelHelper(dnsURI, getter_AddRefs(channel));
+ }
+ if (NS_FAILED(rv) || !channel) {
+ LOG(("TRR:SendHTTPRequest: NewChannel failed!\n"));
+ return rv;
+ }
+
+ auto loadFlags = nsIRequest::LOAD_ANONYMOUS | nsIRequest::INHIBIT_CACHING |
+ nsIRequest::LOAD_BYPASS_CACHE |
+ nsIChannel::LOAD_BYPASS_URL_CLASSIFIER;
+ if (mUseFreshConnection) {
+ // Causes TRRServiceChannel to tell the connection manager
+ // to clear out any connection with the current conn info.
+ loadFlags |= nsIRequest::LOAD_FRESH_CONNECTION;
+ }
+ channel->SetLoadFlags(loadFlags);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = channel->SetNotificationCallbacks(this);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(channel);
+ if (!httpChannel) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ // This connection should not use TRR
+ rv = httpChannel->SetTRRMode(nsIRequest::TRR_DISABLED_MODE);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCString contentType(ContentType());
+ rv = httpChannel->SetRequestHeader("Accept"_ns, contentType, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsAutoCString cred;
+ if (UseDefaultServer()) {
+ TRRService::Get()->GetCredentials(cred);
+ }
+ if (!cred.IsEmpty()) {
+ rv = httpChannel->SetRequestHeader("Authorization"_ns, cred, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ nsCOMPtr<nsIHttpChannelInternal> internalChannel = do_QueryInterface(channel);
+ if (!internalChannel) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ // setting a small stream window means the h2 stack won't pipeline a window
+ // update with each HEADERS or reply to a DATA with a WINDOW UPDATE
+ rv = internalChannel->SetInitialRwin(127 * 1024);
+ NS_ENSURE_SUCCESS(rv, rv);
+ rv = internalChannel->SetIsTRRServiceChannel(true);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (UseDefaultServer() && StaticPrefs::network_trr_async_connInfo()) {
+ RefPtr<nsHttpConnectionInfo> trrConnInfo =
+ TRRService::Get()->TRRConnectionInfo();
+ if (trrConnInfo) {
+ nsAutoCString host;
+ dnsURI->GetHost(host);
+ if (host.Equals(trrConnInfo->GetOrigin())) {
+ internalChannel->SetConnectionInfo(trrConnInfo);
+ LOG(("TRR::SendHTTPRequest use conn info:%s\n",
+ trrConnInfo->HashKey().get()));
+ } else {
+ MOZ_DIAGNOSTIC_ASSERT(false);
+ }
+ } else {
+ TRRService::Get()->InitTRRConnectionInfo();
+ }
+ }
+
+ if (useGet) {
+ rv = httpChannel->SetRequestMethod("GET"_ns);
+ NS_ENSURE_SUCCESS(rv, rv);
+ } else {
+ nsCOMPtr<nsIUploadChannel2> uploadChannel = do_QueryInterface(httpChannel);
+ if (!uploadChannel) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ uint32_t streamLength = body.Length();
+ nsCOMPtr<nsIInputStream> uploadStream;
+ rv =
+ NS_NewCStringInputStream(getter_AddRefs(uploadStream), std::move(body));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = uploadChannel->ExplicitSetUploadStream(uploadStream, contentType,
+ streamLength, "POST"_ns, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ rv = SetupTRRServiceChannelInternal(httpChannel, useGet, contentType);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ rv = httpChannel->AsyncOpen(this);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // If the asyncOpen succeeded we can say that we actually attempted to
+ // use the TRR connection.
+ RefPtr<AddrHostRecord> addrRec = do_QueryObject(mRec);
+ if (addrRec) {
+ addrRec->mResolverType = ResolverType();
+ }
+
+ NS_NewTimerWithCallback(
+ getter_AddRefs(mTimeout), this,
+ mTimeoutMs ? mTimeoutMs : TRRService::Get()->GetRequestTimeout(),
+ nsITimer::TYPE_ONE_SHOT);
+
+ mChannel = channel;
+ return NS_OK;
+}
+
+// static
+nsresult TRR::SetupTRRServiceChannelInternal(nsIHttpChannel* aChannel,
+ bool aUseGet,
+ const nsACString& aContentType) {
+ nsCOMPtr<nsIHttpChannel> httpChannel = aChannel;
+ MOZ_ASSERT(httpChannel);
+
+ nsresult rv = NS_OK;
+ if (!aUseGet) {
+ rv =
+ httpChannel->SetRequestHeader("Cache-Control"_ns, "no-store"_ns, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ // Sanitize the request by removing the Accept-Language header so we minimize
+ // the amount of fingerprintable information we send to the server.
+ if (!StaticPrefs::network_trr_send_accept_language_headers()) {
+ rv = httpChannel->SetRequestHeader("Accept-Language"_ns, ""_ns, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ // Sanitize the request by removing the User-Agent
+ if (!StaticPrefs::network_trr_send_user_agent_headers()) {
+ rv = httpChannel->SetRequestHeader("User-Agent"_ns, ""_ns, false);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ if (StaticPrefs::network_trr_send_empty_accept_encoding_headers()) {
+ rv = httpChannel->SetEmptyRequestHeader("Accept-Encoding"_ns);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ // set the *default* response content type
+ if (NS_FAILED(httpChannel->SetContentType(aContentType))) {
+ LOG(("TRR::SetupTRRServiceChannelInternal: couldn't set content-type!\n"));
+ }
+
+ nsCOMPtr<nsITimedChannel> timedChan(do_QueryInterface(httpChannel));
+ if (timedChan) {
+ timedChan->SetTimingEnabled(true);
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+TRR::GetInterface(const nsIID& iid, void** result) {
+ if (!iid.Equals(NS_GET_IID(nsIHttpPushListener))) {
+ return NS_ERROR_NO_INTERFACE;
+ }
+
+ nsCOMPtr<nsIHttpPushListener> copy(this);
+ *result = copy.forget().take();
+ return NS_OK;
+}
+
+nsresult TRR::DohDecodeQuery(const nsCString& query, nsCString& host,
+ enum TrrType& type) {
+ FallibleTArray<uint8_t> binary;
+ bool found_dns = false;
+ LOG(("TRR::DohDecodeQuery %s!\n", query.get()));
+
+ // extract "dns=" from the query string
+ nsAutoCString data;
+ for (const nsACString& token :
+ nsCCharSeparatedTokenizer(query, '&').ToRange()) {
+ nsDependentCSubstring dns = Substring(token, 0, 4);
+ nsAutoCString check(dns);
+ if (check.Equals("dns=")) {
+ nsDependentCSubstring q = Substring(token, 4, -1);
+ data = q;
+ found_dns = true;
+ break;
+ }
+ }
+ if (!found_dns) {
+ LOG(("TRR::DohDecodeQuery no dns= in pushed URI query string\n"));
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+
+ nsresult rv =
+ Base64URLDecode(data, Base64URLDecodePaddingPolicy::Ignore, binary);
+ NS_ENSURE_SUCCESS(rv, rv);
+ uint32_t avail = binary.Length();
+ if (avail < 12) {
+ return NS_ERROR_FAILURE;
+ }
+ // check the query bit and the opcode
+ if ((binary[2] & 0xf8) != 0) {
+ return NS_ERROR_FAILURE;
+ }
+ uint32_t qdcount = (binary[4] << 8) + binary[5];
+ if (!qdcount) {
+ return NS_ERROR_FAILURE;
+ }
+
+ uint32_t index = 12;
+ uint32_t length = 0;
+ host.Truncate();
+ do {
+ if (avail < (index + 1)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ length = binary[index];
+ if (length) {
+ if (host.Length()) {
+ host.Append(".");
+ }
+ if (avail < (index + 1 + length)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ host.Append((const char*)(&binary[0]) + index + 1, length);
+ }
+ index += 1 + length; // skip length byte + label
+ } while (length);
+
+ LOG(("TRR::DohDecodeQuery host %s\n", host.get()));
+
+ if (avail < (index + 2)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ uint16_t i16 = 0;
+ i16 += binary[index] << 8;
+ i16 += binary[index + 1];
+ type = (enum TrrType)i16;
+
+ LOG(("TRR::DohDecodeQuery type %d\n", (int)type));
+
+ return NS_OK;
+}
+
+nsresult TRR::ReceivePush(nsIHttpChannel* pushed, nsHostRecord* pushedRec) {
+ if (!mHostResolver) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ LOG(("TRR::ReceivePush: PUSH incoming!\n"));
+
+ nsCOMPtr<nsIURI> uri;
+ pushed->GetURI(getter_AddRefs(uri));
+ nsAutoCString query;
+ if (uri) {
+ uri->GetQuery(query);
+ }
+
+ if (NS_FAILED(DohDecodeQuery(query, mHost, mType)) ||
+ HostIsIPLiteral(mHost)) { // literal
+ LOG(("TRR::ReceivePush failed to decode %s\n", mHost.get()));
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ if ((mType != TRRTYPE_A) && (mType != TRRTYPE_AAAA) &&
+ (mType != TRRTYPE_TXT) && (mType != TRRTYPE_HTTPSSVC)) {
+ LOG(("TRR::ReceivePush unknown type %d\n", mType));
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ if (TRRService::Get()->IsExcludedFromTRR(mHost)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ uint32_t type = nsIDNSService::RESOLVE_TYPE_DEFAULT;
+ if (mType == TRRTYPE_TXT) {
+ type = nsIDNSService::RESOLVE_TYPE_TXT;
+ } else if (mType == TRRTYPE_HTTPSSVC) {
+ type = nsIDNSService::RESOLVE_TYPE_HTTPSSVC;
+ }
+
+ RefPtr<nsHostRecord> hostRecord;
+ nsresult rv;
+ rv = mHostResolver->GetHostRecord(
+ mHost, ""_ns, type, pushedRec->flags, pushedRec->af, pushedRec->pb,
+ pushedRec->originSuffix, getter_AddRefs(hostRecord));
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // Since we don't ever call nsHostResolver::NameLookup for this record,
+ // we need to copy the trr mode from the previous record
+ if (hostRecord->mEffectiveTRRMode == nsIRequest::TRR_DEFAULT_MODE) {
+ hostRecord->mEffectiveTRRMode =
+ static_cast<nsIRequest::TRRMode>(pushedRec->mEffectiveTRRMode);
+ }
+
+ rv = mHostResolver->TrrLookup_unlocked(hostRecord, this);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ rv = pushed->AsyncOpen(this);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // OK!
+ mChannel = pushed;
+ mRec.swap(hostRecord);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+TRR::OnPush(nsIHttpChannel* associated, nsIHttpChannel* pushed) {
+ LOG(("TRR::OnPush entry\n"));
+ MOZ_ASSERT(associated == mChannel);
+ if (!mRec) {
+ return NS_ERROR_FAILURE;
+ }
+ if (!UseDefaultServer()) {
+ return NS_ERROR_FAILURE;
+ }
+
+ RefPtr<TRR> trr = new TRR(mHostResolver, mPB);
+ return trr->ReceivePush(pushed, mRec);
+}
+
+NS_IMETHODIMP
+TRR::OnStartRequest(nsIRequest* aRequest) {
+ LOG(("TRR::OnStartRequest %p %s %d\n", this, mHost.get(), mType));
+
+ nsresult status = NS_OK;
+ aRequest->GetStatus(&status);
+
+ if (NS_FAILED(status)) {
+ if (NS_IsOffline()) {
+ RecordReason(TRRSkippedReason::TRR_IS_OFFLINE);
+ }
+
+ switch (status) {
+ case NS_ERROR_UNKNOWN_HOST:
+ RecordReason(TRRSkippedReason::TRR_CHANNEL_DNS_FAIL);
+ break;
+ case NS_ERROR_OFFLINE:
+ RecordReason(TRRSkippedReason::TRR_IS_OFFLINE);
+ break;
+ case NS_ERROR_NET_RESET:
+ RecordReason(TRRSkippedReason::TRR_NET_RESET);
+ break;
+ case NS_ERROR_NET_TIMEOUT:
+ case NS_ERROR_NET_TIMEOUT_EXTERNAL:
+ RecordReason(TRRSkippedReason::TRR_NET_TIMEOUT);
+ break;
+ case NS_ERROR_PROXY_CONNECTION_REFUSED:
+ RecordReason(TRRSkippedReason::TRR_NET_REFUSED);
+ break;
+ case NS_ERROR_NET_INTERRUPT:
+ RecordReason(TRRSkippedReason::TRR_NET_INTERRUPT);
+ break;
+ case NS_ERROR_NET_INADEQUATE_SECURITY:
+ RecordReason(TRRSkippedReason::TRR_NET_INADEQ_SEQURITY);
+ break;
+ default:
+ RecordReason(TRRSkippedReason::TRR_UNKNOWN_CHANNEL_FAILURE);
+ }
+ }
+
+ return NS_OK;
+}
+
+void TRR::SaveAdditionalRecords(
+ const nsClassHashtable<nsCStringHashKey, DOHresp>& aRecords) {
+ if (!mRec) {
+ return;
+ }
+ nsresult rv;
+ for (const auto& recordEntry : aRecords) {
+ if (recordEntry.GetData() && recordEntry.GetData()->mAddresses.IsEmpty()) {
+ // no point in adding empty records.
+ continue;
+ }
+ RefPtr<nsHostRecord> hostRecord;
+ rv = mHostResolver->GetHostRecord(
+ recordEntry.GetKey(), EmptyCString(),
+ nsIDNSService::RESOLVE_TYPE_DEFAULT, mRec->flags, AF_UNSPEC, mRec->pb,
+ mRec->originSuffix, getter_AddRefs(hostRecord));
+ if (NS_FAILED(rv)) {
+ LOG(("Failed to get host record for additional record %s",
+ nsCString(recordEntry.GetKey()).get()));
+ continue;
+ }
+ RefPtr<AddrInfo> ai(
+ new AddrInfo(recordEntry.GetKey(), ResolverType(), TRRTYPE_A,
+ std::move(recordEntry.GetData()->mAddresses),
+ recordEntry.GetData()->mTtl));
+ mHostResolver->MaybeRenewHostRecord(hostRecord);
+
+ // Since we're not actually calling NameLookup for this record, we need
+ // to set these fields to avoid assertions in CompleteLookup.
+ // This is quite hacky, and should be fixed.
+ hostRecord->Reset();
+ hostRecord->mResolving++;
+ hostRecord->mEffectiveTRRMode =
+ static_cast<nsIRequest::TRRMode>(mRec->mEffectiveTRRMode);
+ LOG(("Completing lookup for additional: %s",
+ nsCString(recordEntry.GetKey()).get()));
+ (void)mHostResolver->CompleteLookup(hostRecord, NS_OK, ai, mPB,
+ mOriginSuffix, TRRSkippedReason::TRR_OK,
+ this);
+ }
+}
+
+void TRR::StoreIPHintAsDNSRecord(const struct SVCB& aSVCBRecord) {
+ LOG(("TRR::StoreIPHintAsDNSRecord [%p] [%s]", this,
+ aSVCBRecord.mSvcDomainName.get()));
+ CopyableTArray<NetAddr> addresses;
+ aSVCBRecord.GetIPHints(addresses);
+ if (addresses.IsEmpty()) {
+ return;
+ }
+
+ RefPtr<nsHostRecord> hostRecord;
+ nsresult rv = mHostResolver->GetHostRecord(
+ aSVCBRecord.mSvcDomainName, EmptyCString(),
+ nsIDNSService::RESOLVE_TYPE_DEFAULT,
+ mRec->flags | nsIDNSService::RESOLVE_IP_HINT, AF_UNSPEC, mRec->pb,
+ mRec->originSuffix, getter_AddRefs(hostRecord));
+ if (NS_FAILED(rv)) {
+ LOG(("Failed to get host record"));
+ return;
+ }
+
+ mHostResolver->MaybeRenewHostRecord(hostRecord);
+
+ RefPtr<AddrInfo> ai(new AddrInfo(aSVCBRecord.mSvcDomainName, ResolverType(),
+ TRRTYPE_A, std::move(addresses), mTTL));
+
+ // Since we're not actually calling NameLookup for this record, we need
+ // to set these fields to avoid assertions in CompleteLookup.
+ // This is quite hacky, and should be fixed.
+ hostRecord->mResolving++;
+ hostRecord->mEffectiveTRRMode =
+ static_cast<nsIRequest::TRRMode>(mRec->mEffectiveTRRMode);
+ (void)mHostResolver->CompleteLookup(hostRecord, NS_OK, ai, mPB, mOriginSuffix,
+ TRRSkippedReason::TRR_OK, this);
+}
+
+nsresult TRR::ReturnData(nsIChannel* aChannel) {
+ if (mType != TRRTYPE_TXT && mType != TRRTYPE_HTTPSSVC) {
+ // create and populate an AddrInfo instance to pass on
+ RefPtr<AddrInfo> ai(new AddrInfo(mHost, ResolverType(), mType,
+ nsTArray<NetAddr>(), mDNS.mTtl));
+ auto builder = ai->Build();
+ builder.SetAddresses(std::move(mDNS.mAddresses));
+ builder.SetCanonicalHostname(mCname);
+
+ // Set timings.
+ nsCOMPtr<nsITimedChannel> timedChan = do_QueryInterface(aChannel);
+ if (timedChan) {
+ TimeStamp asyncOpen, start, end;
+ if (NS_SUCCEEDED(timedChan->GetAsyncOpen(&asyncOpen)) &&
+ !asyncOpen.IsNull()) {
+ builder.SetTrrFetchDuration(
+ (TimeStamp::Now() - asyncOpen).ToMilliseconds());
+ }
+ if (NS_SUCCEEDED(timedChan->GetRequestStart(&start)) &&
+ NS_SUCCEEDED(timedChan->GetResponseEnd(&end)) && !start.IsNull() &&
+ !end.IsNull()) {
+ builder.SetTrrFetchDurationNetworkOnly((end - start).ToMilliseconds());
+ }
+ }
+ ai = builder.Finish();
+
+ if (!mHostResolver) {
+ return NS_ERROR_FAILURE;
+ }
+ (void)mHostResolver->CompleteLookup(mRec, NS_OK, ai, mPB, mOriginSuffix,
+ mTRRSkippedReason, this);
+ mHostResolver = nullptr;
+ mRec = nullptr;
+ } else {
+ (void)mHostResolver->CompleteLookupByType(mRec, NS_OK, mResult, mTTL, mPB);
+ }
+ return NS_OK;
+}
+
+nsresult TRR::FailData(nsresult error) {
+ if (!mHostResolver) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // If we didn't record a reason until now, record a default one.
+ RecordReason(TRRSkippedReason::TRR_FAILED);
+
+ if (mType == TRRTYPE_TXT || mType == TRRTYPE_HTTPSSVC) {
+ TypeRecordResultType empty(Nothing{});
+ (void)mHostResolver->CompleteLookupByType(mRec, error, empty, 0, mPB);
+ } else {
+ // create and populate an TRR AddrInfo instance to pass on to signal that
+ // this comes from TRR
+ nsTArray<NetAddr> noAddresses;
+ RefPtr<AddrInfo> ai =
+ new AddrInfo(mHost, ResolverType(), mType, std::move(noAddresses));
+
+ (void)mHostResolver->CompleteLookup(mRec, error, ai, mPB, mOriginSuffix,
+ mTRRSkippedReason, this);
+ }
+
+ mHostResolver = nullptr;
+ mRec = nullptr;
+ return NS_OK;
+}
+
+void TRR::HandleDecodeError(nsresult aStatusCode) {
+ auto rcode = mPacket->GetRCode();
+ if (rcode.isOk() && rcode.unwrap() != 0) {
+ if (rcode.unwrap() == 0x03) {
+ RecordReason(TRRSkippedReason::TRR_NXDOMAIN);
+ } else {
+ RecordReason(TRRSkippedReason::TRR_RCODE_FAIL);
+ }
+ } else if (aStatusCode == NS_ERROR_UNKNOWN_HOST ||
+ aStatusCode == NS_ERROR_DEFINITIVE_UNKNOWN_HOST) {
+ RecordReason(TRRSkippedReason::TRR_NO_ANSWERS);
+ } else {
+ RecordReason(TRRSkippedReason::TRR_DECODE_FAILED);
+ }
+}
+
+bool TRR::HasUsableResponse() {
+ if (mType == TRRTYPE_A || mType == TRRTYPE_AAAA) {
+ return !mDNS.mAddresses.IsEmpty();
+ }
+ if (mType == TRRTYPE_TXT) {
+ return mResult.is<TypeRecordTxt>();
+ }
+ if (mType == TRRTYPE_HTTPSSVC) {
+ return mResult.is<TypeRecordHTTPSSVC>();
+ }
+ return false;
+}
+
+nsresult TRR::FollowCname(nsIChannel* aChannel) {
+ nsresult rv = NS_OK;
+ nsAutoCString cname;
+ while (NS_SUCCEEDED(rv) && mDNS.mAddresses.IsEmpty() && !mCname.IsEmpty() &&
+ mCnameLoop > 0) {
+ mCnameLoop--;
+ LOG(("TRR::On200Response CNAME %s => %s (%u)\n", mHost.get(), mCname.get(),
+ mCnameLoop));
+ cname = mCname;
+ mCname.Truncate();
+
+ LOG(("TRR: check for CNAME record for %s within previous response\n",
+ cname.get()));
+ nsClassHashtable<nsCStringHashKey, DOHresp> additionalRecords;
+ rv = GetOrCreateDNSPacket()->Decode(
+ cname, mType, mCname, StaticPrefs::network_trr_allow_rfc1918(), mDNS,
+ mResult, additionalRecords, mTTL);
+ if (NS_FAILED(rv)) {
+ LOG(("TRR::FollowCname DohDecode %x\n", (int)rv));
+ HandleDecodeError(rv);
+ }
+ }
+
+ // restore mCname as DohDecode() change it
+ mCname = cname;
+ if (NS_SUCCEEDED(rv) && HasUsableResponse()) {
+ ReturnData(aChannel);
+ return NS_OK;
+ }
+
+ bool ra = mPacket && mPacket->RecursionAvailable().unwrapOr(false);
+ LOG(("ra = %d", ra));
+ if (rv == NS_ERROR_UNKNOWN_HOST && ra) {
+ // If recursion is available, but no addresses have been returned,
+ // we can just return a failure here.
+ LOG(("TRR::FollowCname not sending another request as RA flag is set."));
+ FailData(NS_ERROR_UNKNOWN_HOST);
+ return NS_OK;
+ }
+
+ if (!mCnameLoop) {
+ LOG(("TRR::On200Response CNAME loop, eject!\n"));
+ return NS_ERROR_REDIRECT_LOOP;
+ }
+
+ LOG(("TRR::On200Response CNAME %s => %s (%u)\n", mHost.get(), mCname.get(),
+ mCnameLoop));
+ RefPtr<TRR> trr =
+ new TRR(mHostResolver, mRec, mCname, mType, mCnameLoop, mPB);
+ if (!TRRService::Get()) {
+ return NS_ERROR_FAILURE;
+ }
+ return TRRService::Get()->DispatchTRRRequest(trr);
+}
+
+nsresult TRR::On200Response(nsIChannel* aChannel) {
+ // decode body and create an AddrInfo struct for the response
+ nsClassHashtable<nsCStringHashKey, DOHresp> additionalRecords;
+ RefPtr<TypeHostRecord> typeRec = do_QueryObject(mRec);
+ if (typeRec && typeRec->mOriginHost) {
+ GetOrCreateDNSPacket()->SetOriginHost(typeRec->mOriginHost);
+ }
+ nsresult rv = GetOrCreateDNSPacket()->Decode(
+ mHost, mType, mCname, StaticPrefs::network_trr_allow_rfc1918(), mDNS,
+ mResult, additionalRecords, mTTL);
+ if (NS_FAILED(rv)) {
+ LOG(("TRR::On200Response DohDecode %x\n", (int)rv));
+ HandleDecodeError(rv);
+ return rv;
+ }
+ SaveAdditionalRecords(additionalRecords);
+
+ if (mResult.is<TypeRecordHTTPSSVC>()) {
+ auto& results = mResult.as<TypeRecordHTTPSSVC>();
+ for (const auto& rec : results) {
+ StoreIPHintAsDNSRecord(rec);
+ }
+ }
+
+ if (!mDNS.mAddresses.IsEmpty() || mType == TRRTYPE_TXT || mCname.IsEmpty()) {
+ // pass back the response data
+ ReturnData(aChannel);
+ return NS_OK;
+ }
+
+ LOG(("TRR::On200Response trying CNAME %s", mCname.get()));
+ return FollowCname(aChannel);
+}
+
+void TRR::RecordProcessingTime(nsIChannel* aChannel) {
+ // This method records the time it took from the last received byte of the
+ // DoH response until we've notified the consumer with a host record.
+ nsCOMPtr<nsITimedChannel> timedChan = do_QueryInterface(aChannel);
+ if (!timedChan) {
+ return;
+ }
+ TimeStamp end;
+ if (NS_FAILED(timedChan->GetResponseEnd(&end))) {
+ return;
+ }
+
+ if (end.IsNull()) {
+ return;
+ }
+
+ Telemetry::AccumulateTimeDelta(Telemetry::DNS_TRR_PROCESSING_TIME, end);
+
+ LOG(("Processing DoH response took %f ms",
+ (TimeStamp::Now() - end).ToMilliseconds()));
+}
+
+void TRR::ReportStatus(nsresult aStatusCode) {
+ // If the TRR was cancelled by nsHostResolver, then we don't need to report
+ // it as failed; otherwise it can cause the confirmation to fail.
+ if (UseDefaultServer() && aStatusCode != NS_ERROR_ABORT) {
+ // Bad content is still considered "okay" if the HTTP response is okay
+ TRRService::Get()->RecordTRRStatus(this);
+ }
+}
+
+static void RecordHttpVersion(nsIHttpChannel* aHttpChannel) {
+ nsCOMPtr<nsIHttpChannelInternal> internalChannel =
+ do_QueryInterface(aHttpChannel);
+ if (!internalChannel) {
+ LOG(("RecordHttpVersion: Failed to QI nsIHttpChannelInternal"));
+ return;
+ }
+
+ uint32_t major, minor;
+ if (NS_FAILED(internalChannel->GetResponseVersion(&major, &minor))) {
+ LOG(("RecordHttpVersion: Failed to get protocol version"));
+ return;
+ }
+
+ auto label = Telemetry::LABELS_DNS_TRR_HTTP_VERSION2::h_1;
+ if (major == 2) {
+ label = Telemetry::LABELS_DNS_TRR_HTTP_VERSION2::h_2;
+ } else if (major == 3) {
+ label = Telemetry::LABELS_DNS_TRR_HTTP_VERSION2::h_3;
+ }
+
+ Telemetry::AccumulateCategoricalKeyed(TRRService::ProviderKey(), label);
+
+ LOG(("RecordHttpVersion: Provider responded using HTTP version: %d", major));
+}
+
+NS_IMETHODIMP
+TRR::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
+ // The dtor will be run after the function returns
+ LOG(("TRR:OnStopRequest %p %s %d failed=%d code=%X\n", this, mHost.get(),
+ mType, mFailed, (unsigned int)aStatusCode));
+ nsCOMPtr<nsIChannel> channel;
+ channel.swap(mChannel);
+
+ mChannelStatus = aStatusCode;
+
+ {
+ // Cancel the timer since we don't need it anymore.
+ nsCOMPtr<nsITimer> timer;
+ mTimeout.swap(timer);
+ if (timer) {
+ timer->Cancel();
+ }
+ }
+
+ auto scopeExit = MakeScopeExit([&] { ReportStatus(aStatusCode); });
+
+ nsresult rv = NS_OK;
+ // if status was "fine", parse the response and pass on the answer
+ if (!mFailed && NS_SUCCEEDED(aStatusCode)) {
+ nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest);
+ if (!httpChannel) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ nsAutoCString contentType;
+ httpChannel->GetContentType(contentType);
+ if (contentType.Length() &&
+ !contentType.LowerCaseEqualsASCII(ContentType())) {
+ LOG(("TRR:OnStopRequest %p %s %d wrong content type %s\n", this,
+ mHost.get(), mType, contentType.get()));
+ FailData(NS_ERROR_UNEXPECTED);
+ return NS_OK;
+ }
+
+ uint32_t httpStatus;
+ rv = httpChannel->GetResponseStatus(&httpStatus);
+ if (NS_SUCCEEDED(rv) && httpStatus == 200) {
+ rv = On200Response(channel);
+ if (NS_SUCCEEDED(rv) && UseDefaultServer()) {
+ RecordReason(TRRSkippedReason::TRR_OK);
+ RecordProcessingTime(channel);
+ RecordHttpVersion(httpChannel);
+ return rv;
+ }
+ } else {
+ RecordReason(TRRSkippedReason::TRR_SERVER_RESPONSE_ERR);
+ LOG(("TRR:OnStopRequest:%d %p rv %x httpStatus %d\n", __LINE__, this,
+ (int)rv, httpStatus));
+ }
+ }
+
+ LOG(("TRR:OnStopRequest %p status %x mFailed %d\n", this, (int)aStatusCode,
+ mFailed));
+ FailData(NS_SUCCEEDED(rv) ? NS_ERROR_UNKNOWN_HOST : rv);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+TRR::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInputStream,
+ uint64_t aOffset, const uint32_t aCount) {
+ LOG(("TRR:OnDataAvailable %p %s %d failed=%d aCount=%u\n", this, mHost.get(),
+ mType, mFailed, (unsigned int)aCount));
+ // receive DNS response into the local buffer
+ if (mFailed) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsresult rv = GetOrCreateDNSPacket()->OnDataAvailable(aRequest, aInputStream,
+ aOffset, aCount);
+ if (NS_FAILED(rv)) {
+ LOG(("TRR::OnDataAvailable:%d fail\n", __LINE__));
+ mFailed = true;
+ return rv;
+ }
+ return NS_OK;
+}
+
+void TRR::Cancel(nsresult aStatus) {
+ bool isTRRServiceChannel = false;
+ nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal(
+ do_QueryInterface(mChannel));
+ if (httpChannelInternal) {
+ nsresult rv =
+ httpChannelInternal->GetIsTRRServiceChannel(&isTRRServiceChannel);
+ if (NS_FAILED(rv)) {
+ isTRRServiceChannel = false;
+ }
+ }
+ // nsHttpChannel can be only canceled on the main thread.
+ RefPtr<nsHttpChannel> httpChannel = do_QueryObject(mChannel);
+ if (isTRRServiceChannel && !XRE_IsSocketProcess() && !httpChannel) {
+ if (TRRService::Get()) {
+ nsCOMPtr<nsIThread> thread = TRRService::Get()->TRRThread();
+ if (thread && !thread->IsOnCurrentThread()) {
+ thread->Dispatch(NS_NewRunnableFunction(
+ "TRR::Cancel",
+ [self = RefPtr(this), aStatus]() { self->Cancel(aStatus); }));
+ return;
+ }
+ }
+ } else {
+ if (!NS_IsMainThread()) {
+ NS_DispatchToMainThread(NS_NewRunnableFunction(
+ "TRR::Cancel",
+ [self = RefPtr(this), aStatus]() { self->Cancel(aStatus); }));
+ return;
+ }
+ }
+
+ if (mCancelled) {
+ return;
+ }
+ mCancelled = true;
+
+ if (mChannel) {
+ RecordReason(TRRSkippedReason::TRR_REQ_CANCELLED);
+ LOG(("TRR: %p canceling Channel %p %s %d status=%" PRIx32 "\n", this,
+ mChannel.get(), mHost.get(), mType, static_cast<uint32_t>(aStatus)));
+ mChannel->Cancel(aStatus);
+ }
+}
+
+bool TRR::UseDefaultServer() { return !mRec || mRec->mTrrServer.IsEmpty(); }
+
+} // namespace net
+} // namespace mozilla