diff options
Diffstat (limited to 'netwerk/dns/TRR.cpp')
| -rw-r--r-- | netwerk/dns/TRR.cpp | 1110 |
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 |