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/* 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
#include "HTTPSSVC.h"
#include "mozilla/net/DNS.h"
#include "mozilla/glean/GleanMetrics.h"
#include "mozilla/StaticPrefs_network.h"
#include "nsHttp.h"
#include "nsHttpHandler.h"
#include "nsNetAddr.h"
#include "nsNetUtil.h"
#include "nsIDNSService.h"
namespace mozilla {
namespace net {
NS_IMPL_ISUPPORTS(SVCBRecord, nsISVCBRecord)
class SvcParam : public nsISVCParam,
public nsISVCParamAlpn,
public nsISVCParamNoDefaultAlpn,
public nsISVCParamPort,
public nsISVCParamIPv4Hint,
public nsISVCParamEchConfig,
public nsISVCParamIPv6Hint,
public nsISVCParamODoHConfig {
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSISVCPARAM
NS_DECL_NSISVCPARAMALPN
NS_DECL_NSISVCPARAMNODEFAULTALPN
NS_DECL_NSISVCPARAMPORT
NS_DECL_NSISVCPARAMIPV4HINT
NS_DECL_NSISVCPARAMECHCONFIG
NS_DECL_NSISVCPARAMIPV6HINT
NS_DECL_NSISVCPARAMODOHCONFIG
public:
explicit SvcParam(const SvcParamType& value) : mValue(value) {};
private:
virtual ~SvcParam() = default;
SvcParamType mValue;
};
NS_IMPL_ADDREF(SvcParam)
NS_IMPL_RELEASE(SvcParam)
NS_INTERFACE_MAP_BEGIN(SvcParam)
NS_INTERFACE_MAP_ENTRY(nsISVCParam)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISVCParam)
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamAlpn, mValue.is<SvcParamAlpn>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamNoDefaultAlpn,
mValue.is<SvcParamNoDefaultAlpn>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamPort, mValue.is<SvcParamPort>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamIPv4Hint,
mValue.is<SvcParamIpv4Hint>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamEchConfig,
mValue.is<SvcParamEchConfig>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamIPv6Hint,
mValue.is<SvcParamIpv6Hint>())
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISVCParamODoHConfig,
mValue.is<SvcParamODoHConfig>())
NS_INTERFACE_MAP_END
NS_IMETHODIMP
SvcParam::GetType(uint16_t* aType) {
*aType = mValue.match(
[](Nothing&) { return SvcParamKeyMandatory; },
[](SvcParamAlpn&) { return SvcParamKeyAlpn; },
[](SvcParamNoDefaultAlpn&) { return SvcParamKeyNoDefaultAlpn; },
[](SvcParamPort&) { return SvcParamKeyPort; },
[](SvcParamIpv4Hint&) { return SvcParamKeyIpv4Hint; },
[](SvcParamEchConfig&) { return SvcParamKeyEchConfig; },
[](SvcParamIpv6Hint&) { return SvcParamKeyIpv6Hint; },
[](SvcParamODoHConfig&) { return SvcParamKeyODoHConfig; });
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetAlpn(nsTArray<nsCString>& aAlpn) {
if (!mValue.is<SvcParamAlpn>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
aAlpn.AppendElements(mValue.as<SvcParamAlpn>().mValue);
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetPort(uint16_t* aPort) {
if (!mValue.is<SvcParamPort>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
*aPort = mValue.as<SvcParamPort>().mValue;
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetEchconfig(nsACString& aEchConfig) {
if (!mValue.is<SvcParamEchConfig>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
aEchConfig = mValue.as<SvcParamEchConfig>().mValue;
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetIpv4Hint(nsTArray<RefPtr<nsINetAddr>>& aIpv4Hint) {
if (!mValue.is<SvcParamIpv4Hint>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
const auto& results = mValue.as<SvcParamIpv4Hint>().mValue;
for (const auto& ip : results) {
if (ip.raw.family != AF_INET) {
return NS_ERROR_UNEXPECTED;
}
RefPtr<nsINetAddr> hint = new nsNetAddr(&ip);
aIpv4Hint.AppendElement(hint);
}
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetIpv6Hint(nsTArray<RefPtr<nsINetAddr>>& aIpv6Hint) {
if (!mValue.is<SvcParamIpv6Hint>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
const auto& results = mValue.as<SvcParamIpv6Hint>().mValue;
for (const auto& ip : results) {
if (ip.raw.family != AF_INET6) {
return NS_ERROR_UNEXPECTED;
}
RefPtr<nsINetAddr> hint = new nsNetAddr(&ip);
aIpv6Hint.AppendElement(hint);
}
return NS_OK;
}
NS_IMETHODIMP
SvcParam::GetODoHConfig(nsACString& aODoHConfig) {
if (!mValue.is<SvcParamODoHConfig>()) {
MOZ_ASSERT(false, "Unexpected type for variant");
return NS_ERROR_NOT_AVAILABLE;
}
aODoHConfig = mValue.as<SvcParamODoHConfig>().mValue;
return NS_OK;
}
bool SVCB::operator<(const SVCB& aOther) const {
if (gHttpHandler->EchConfigEnabled()) {
if (mHasEchConfig && !aOther.mHasEchConfig) {
return true;
}
if (!mHasEchConfig && aOther.mHasEchConfig) {
return false;
}
}
return mSvcFieldPriority < aOther.mSvcFieldPriority;
}
Maybe<uint16_t> SVCB::GetPort() const {
Maybe<uint16_t> port;
for (const auto& value : mSvcFieldValue) {
if (value.mValue.is<SvcParamPort>()) {
port.emplace(value.mValue.as<SvcParamPort>().mValue);
if (NS_FAILED(NS_CheckPortSafety(*port, "https"))) {
*port = 0;
}
return port;
}
}
return Nothing();
}
bool SVCB::NoDefaultAlpn() const {
for (const auto& value : mSvcFieldValue) {
if (value.mValue.is<SvcParamKeyNoDefaultAlpn>()) {
return true;
}
}
return false;
}
void SVCB::GetIPHints(CopyableTArray<mozilla::net::NetAddr>& aAddresses) const {
if (mSvcFieldPriority == 0) {
return;
}
for (const auto& value : mSvcFieldValue) {
if (value.mValue.is<SvcParamIpv4Hint>()) {
aAddresses.AppendElements(value.mValue.as<SvcParamIpv4Hint>().mValue);
} else if (value.mValue.is<SvcParamIpv6Hint>()) {
aAddresses.AppendElements(value.mValue.as<SvcParamIpv6Hint>().mValue);
}
}
}
class AlpnComparator {
public:
bool Equals(const std::tuple<nsCString, SupportedAlpnRank>& aA,
const std::tuple<nsCString, SupportedAlpnRank>& aB) const {
return std::get<1>(aA) == std::get<1>(aB);
}
bool LessThan(const std::tuple<nsCString, SupportedAlpnRank>& aA,
const std::tuple<nsCString, SupportedAlpnRank>& aB) const {
return std::get<1>(aA) > std::get<1>(aB);
}
};
nsTArray<std::tuple<nsCString, SupportedAlpnRank>> SVCB::GetAllAlpn() const {
nsTArray<std::tuple<nsCString, SupportedAlpnRank>> alpnList;
for (const auto& value : mSvcFieldValue) {
if (value.mValue.is<SvcParamAlpn>()) {
for (const auto& alpn : value.mValue.as<SvcParamAlpn>().mValue) {
alpnList.AppendElement(std::make_tuple(alpn, IsAlpnSupported(alpn)));
}
}
}
alpnList.Sort(AlpnComparator());
return alpnList;
}
SVCBRecord::SVCBRecord(const SVCB& data,
Maybe<std::tuple<nsCString, SupportedAlpnRank>> aAlpn)
: mData(data), mAlpn(aAlpn) {
mPort = mData.GetPort();
}
NS_IMETHODIMP SVCBRecord::GetPriority(uint16_t* aPriority) {
*aPriority = mData.mSvcFieldPriority;
return NS_OK;
}
NS_IMETHODIMP SVCBRecord::GetName(nsACString& aName) {
aName = mData.mSvcDomainName;
return NS_OK;
}
Maybe<uint16_t> SVCBRecord::GetPort() { return mPort; }
Maybe<std::tuple<nsCString, SupportedAlpnRank>> SVCBRecord::GetAlpn() {
return mAlpn;
}
NS_IMETHODIMP SVCBRecord::GetSelectedAlpn(nsACString& aAlpn) {
if (!mAlpn) {
return NS_ERROR_NOT_AVAILABLE;
}
aAlpn = std::get<0>(*mAlpn);
return NS_OK;
}
NS_IMETHODIMP SVCBRecord::GetEchConfig(nsACString& aEchConfig) {
aEchConfig = mData.mEchConfig;
return NS_OK;
}
NS_IMETHODIMP SVCBRecord::GetODoHConfig(nsACString& aODoHConfig) {
aODoHConfig = mData.mODoHConfig;
return NS_OK;
}
NS_IMETHODIMP SVCBRecord::GetValues(nsTArray<RefPtr<nsISVCParam>>& aValues) {
for (const auto& v : mData.mSvcFieldValue) {
RefPtr<nsISVCParam> param = new SvcParam(v.mValue);
aValues.AppendElement(param);
}
return NS_OK;
}
NS_IMETHODIMP SVCBRecord::GetHasIPHintAddress(bool* aHasIPHintAddress) {
*aHasIPHintAddress = mData.mHasIPHints;
return NS_OK;
}
static bool CheckRecordIsUsableWithCname(const SVCB& aRecord,
const nsACString& aCname) {
if (StaticPrefs::network_dns_https_rr_check_record_with_cname() &&
!aCname.IsEmpty() && !aRecord.mSvcDomainName.Equals(aCname)) {
return false;
}
return true;
}
static bool CheckRecordIsUsable(const SVCB& aRecord, nsIDNSService* aDNSService,
const nsACString& aHost,
uint32_t& aExcludedCount) {
if (!aHost.IsEmpty()) {
bool excluded = false;
if (NS_SUCCEEDED(aDNSService->IsSVCDomainNameFailed(
aHost, aRecord.mSvcDomainName, &excluded)) &&
excluded) {
// Skip if the domain name of this record was failed to connect before.
++aExcludedCount;
return false;
}
}
Maybe<uint16_t> port = aRecord.GetPort();
if (port && *port == 0) {
// Found an unsafe port, skip this record.
return false;
}
return true;
}
static bool CheckAlpnIsUsable(SupportedAlpnRank aAlpnType, bool aNoHttp2,
bool aNoHttp3, bool aCheckHttp3ExcludedList,
const nsACString& aTargetName,
uint32_t& aExcludedCount) {
// Skip if this alpn is not supported.
if (aAlpnType == SupportedAlpnRank::NOT_SUPPORTED) {
return false;
}
// Skip if we don't want to use http2.
if (aNoHttp2 && aAlpnType == SupportedAlpnRank::HTTP_2) {
return false;
}
if (IsHttp3(aAlpnType)) {
if (aCheckHttp3ExcludedList && gHttpHandler->IsHttp3Excluded(aTargetName)) {
aExcludedCount++;
return false;
}
if (aNoHttp3) {
return false;
}
}
return true;
}
static nsTArray<SVCBWrapper> FlattenRecords(const nsTArray<SVCB>& aRecords) {
nsTArray<SVCBWrapper> result;
for (const auto& record : aRecords) {
nsTArray<std::tuple<nsCString, SupportedAlpnRank>> alpnList =
record.GetAllAlpn();
if (alpnList.IsEmpty()) {
result.AppendElement(SVCBWrapper(record));
} else {
for (const auto& alpn : alpnList) {
SVCBWrapper wrapper(record);
wrapper.mAlpn = Some(alpn);
result.AppendElement(wrapper);
}
}
}
return result;
}
static void TelemetryForServiceModeRecord(const nsACString& aKey) {
#ifndef ANDROID
glean::networking::https_record_state.Get(aKey).Add(1);
#endif
}
already_AddRefed<nsISVCBRecord>
DNSHTTPSSVCRecordBase::GetServiceModeRecordInternal(
bool aNoHttp2, bool aNoHttp3, const nsTArray<SVCB>& aRecords,
bool& aRecordsAllExcluded, bool aCheckHttp3ExcludedList,
const nsACString& aCname) {
RefPtr<SVCBRecord> selectedRecord;
RefPtr<SVCBRecord> h3RecordWithEchConfig;
uint32_t recordHasNoDefaultAlpnCount = 0;
uint32_t recordExcludedCount = 0;
uint32_t recordHasUnmatchedCname = 0;
aRecordsAllExcluded = false;
nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID);
uint32_t h3ExcludedCount = 0;
nsTArray<SVCBWrapper> records = FlattenRecords(aRecords);
for (const auto& record : records) {
if (record.mRecord.mSvcFieldPriority == 0) {
// In ServiceMode, the SvcPriority should never be 0.
TelemetryForServiceModeRecord("invalid"_ns);
return nullptr;
}
if (record.mRecord.NoDefaultAlpn()) {
++recordHasNoDefaultAlpnCount;
}
if (!CheckRecordIsUsable(record.mRecord, dns, mHost, recordExcludedCount)) {
// Skip if this record is not usable.
continue;
}
if (!CheckRecordIsUsableWithCname(record.mRecord, aCname)) {
recordHasUnmatchedCname++;
continue;
}
if (record.mAlpn) {
if (!CheckAlpnIsUsable(std::get<1>(*(record.mAlpn)), aNoHttp2, aNoHttp3,
aCheckHttp3ExcludedList,
record.mRecord.mSvcDomainName, h3ExcludedCount)) {
continue;
}
if (IsHttp3(std::get<1>(*(record.mAlpn)))) {
// If the selected alpn is h3 and ech for h3 is disabled, we want
// to find out if there is another non-h3 record that has
// echConfig. If yes, we'll use the non-h3 record with echConfig
// to connect. If not, we'll use h3 to connect without echConfig.
if (record.mRecord.mHasEchConfig &&
(gHttpHandler->EchConfigEnabled() &&
!gHttpHandler->EchConfigEnabled(true))) {
if (!h3RecordWithEchConfig) {
// Save this h3 record for later use.
h3RecordWithEchConfig =
new SVCBRecord(record.mRecord, record.mAlpn);
// Make sure the next record is not h3.
aNoHttp3 = true;
continue;
}
}
}
}
if (!selectedRecord) {
selectedRecord = new SVCBRecord(record.mRecord, record.mAlpn);
}
}
if (!selectedRecord && !h3RecordWithEchConfig) {
// If all records indicate "no-default-alpn", we should not use this RRSet.
if (recordHasNoDefaultAlpnCount == records.Length()) {
TelemetryForServiceModeRecord("no_default_alpn"_ns);
return nullptr;
}
if (recordExcludedCount == records.Length()) {
aRecordsAllExcluded = true;
TelemetryForServiceModeRecord("all_excluded"_ns);
return nullptr;
}
if (recordHasUnmatchedCname == records.Length()) {
TelemetryForServiceModeRecord("unmatched_cname"_ns);
return nullptr;
}
// If all records are in http3 excluded list, try again without checking the
// excluded list. This is better than returning nothing.
if (h3ExcludedCount == records.Length() && aCheckHttp3ExcludedList) {
return GetServiceModeRecordInternal(aNoHttp2, aNoHttp3, aRecords,
aRecordsAllExcluded, false, aCname);
}
}
if (h3RecordWithEchConfig) {
TelemetryForServiceModeRecord("succeeded"_ns);
if (selectedRecord && selectedRecord->mData.mHasEchConfig) {
return selectedRecord.forget();
}
return h3RecordWithEchConfig.forget();
}
if (selectedRecord) {
TelemetryForServiceModeRecord("succeeded"_ns);
} else {
TelemetryForServiceModeRecord("others"_ns);
}
return selectedRecord.forget();
}
void DNSHTTPSSVCRecordBase::GetAllRecordsWithEchConfigInternal(
bool aNoHttp2, bool aNoHttp3, const nsACString& aCname,
const nsTArray<SVCB>& aRecords, bool* aAllRecordsHaveEchConfig,
bool* aAllRecordsInH3ExcludedList, nsTArray<RefPtr<nsISVCBRecord>>& aResult,
bool aCheckHttp3ExcludedList) {
if (aRecords.IsEmpty()) {
return;
}
*aAllRecordsHaveEchConfig = aRecords[0].mHasEchConfig;
*aAllRecordsInH3ExcludedList = false;
// The first record should have echConfig.
if (!(*aAllRecordsHaveEchConfig)) {
return;
}
uint32_t h3ExcludedCount = 0;
nsTArray<SVCBWrapper> records = FlattenRecords(aRecords);
for (const auto& record : records) {
if (record.mRecord.mSvcFieldPriority == 0) {
// This should not happen, since GetAllRecordsWithEchConfigInternal()
// should be called only if GetServiceModeRecordInternal() returns a
// non-null record.
MOZ_ASSERT(false);
return;
}
// Records with echConfig are in front of records without echConfig, so we
// don't have to continue.
*aAllRecordsHaveEchConfig &= record.mRecord.mHasEchConfig;
if (!(*aAllRecordsHaveEchConfig)) {
aResult.Clear();
return;
}
if (!CheckRecordIsUsableWithCname(record.mRecord, aCname)) {
continue;
}
Maybe<uint16_t> port = record.mRecord.GetPort();
if (port && *port == 0) {
// Found an unsafe port, skip this record.
continue;
}
if (record.mAlpn) {
if (!CheckAlpnIsUsable(std::get<1>(*(record.mAlpn)), aNoHttp2, aNoHttp3,
aCheckHttp3ExcludedList,
record.mRecord.mSvcDomainName, h3ExcludedCount)) {
continue;
}
}
RefPtr<nsISVCBRecord> svcbRecord =
new SVCBRecord(record.mRecord, record.mAlpn);
aResult.AppendElement(svcbRecord);
}
// If all records are in http3 excluded list, try again without checking the
// excluded list. This is better than returning nothing.
if (h3ExcludedCount == records.Length() && aCheckHttp3ExcludedList) {
GetAllRecordsWithEchConfigInternal(
aNoHttp2, aNoHttp3, aCname, aRecords, aAllRecordsHaveEchConfig,
aAllRecordsInH3ExcludedList, aResult, false);
*aAllRecordsInH3ExcludedList = true;
}
}
bool DNSHTTPSSVCRecordBase::HasIPAddressesInternal(
const nsTArray<SVCB>& aRecords) {
for (const SVCB& record : aRecords) {
if (record.mSvcFieldPriority != 0) {
for (const auto& value : record.mSvcFieldValue) {
if (value.mValue.is<SvcParamIpv4Hint>()) {
return true;
}
if (value.mValue.is<SvcParamIpv6Hint>()) {
return true;
}
}
}
}
return false;
}
} // namespace net
} // namespace mozilla