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http2_flood_integration_test.cc
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#include <algorithm>
#include <string>
#include "envoy/config/bootstrap/v3/bootstrap.pb.h"
#include "envoy/config/cluster/v3/cluster.pb.h"
#include "envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.pb.h"
#include "source/common/buffer/buffer_impl.h"
#include "source/common/common/random_generator.h"
#include "source/common/http/header_map_impl.h"
#include "source/common/network/socket_option_impl.h"
#include "test/integration/autonomous_upstream.h"
#include "test/integration/http_integration.h"
#include "test/integration/socket_interface_swap.h"
#include "test/integration/tracked_watermark_buffer.h"
#include "test/integration/utility.h"
#include "test/mocks/http/mocks.h"
#include "test/test_common/network_utility.h"
#include "test/test_common/printers.h"
#include "test/test_common/test_runtime.h"
#include "test/test_common/utility.h"
#include "gtest/gtest.h"
using ::testing::HasSubstr;
namespace Envoy {
namespace {
const uint32_t ControlFrameFloodLimit = 100;
const uint32_t AllFrameFloodLimit = 1000;
bool deferredProcessing(std::tuple<Network::Address::IpVersion, bool, bool> params) {
return std::get<2>(params);
}
} // namespace
std::string testParamsToString(
const ::testing::TestParamInfo<std::tuple<Network::Address::IpVersion, bool, bool>> params) {
const bool is_v4 = (std::get<0>(params.param) == Network::Address::IpVersion::v4);
const bool http2_new_codec_wrapper = std::get<1>(params.param);
return absl::StrCat(
is_v4 ? "IPv4" : "IPv6", http2_new_codec_wrapper ? "WrappedHttp2" : "BareHttp2",
deferredProcessing(params.param) ? "WithDeferredProcessing" : "NoDeferredProcessing");
}
// It is important that the new socket interface is installed before any I/O activity starts and
// the previous one is restored after all I/O activity stops. Since the HttpIntegrationTest
// destructor stops Envoy the SocketInterfaceSwap destructor needs to run after it. This order of
// multiple inheritance ensures that SocketInterfaceSwap destructor runs after
// Http2FrameIntegrationTest destructor completes.
class Http2FloodMitigationTest
: public SocketInterfaceSwap,
public testing::TestWithParam<std::tuple<Network::Address::IpVersion, bool, bool>>,
public Http2RawFrameIntegrationTest {
public:
Http2FloodMitigationTest() : Http2RawFrameIntegrationTest(std::get<0>(GetParam())) {
// This test tracks the number of buffers created, and the tag extraction check uses some
// buffers, so disable it in this test.
skip_tag_extraction_rule_check_ = true;
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) { hcm.mutable_delayed_close_timeout()->set_seconds(1); });
config_helper_.addConfigModifier(configureProxyStatus());
const bool enable_new_wrapper = std::get<1>(GetParam());
config_helper_.addRuntimeOverride("envoy.reloadable_features.http2_new_codec_wrapper",
enable_new_wrapper ? "true" : "false");
config_helper_.addRuntimeOverride(Runtime::defer_processing_backedup_streams,
deferredProcessing(GetParam()) ? "true" : "false");
}
protected:
void initializeUpstreamFloodTest();
std::vector<char> serializeFrames(const Http2Frame& frame, uint32_t num_frames);
void floodServer(const Http2Frame& frame, const std::string& flood_stat, uint32_t num_frames);
void floodServer(absl::string_view host, absl::string_view path,
Http2Frame::ResponseStatus expected_http_status, const std::string& flood_stat,
uint32_t num_frames);
void floodClient(const Http2Frame& frame, uint32_t num_frames, const std::string& flood_stat);
void setNetworkConnectionBufferSize();
void beginSession() override;
void prefillOutboundDownstreamQueue(uint32_t data_frame_count, uint32_t data_frame_size = 10);
IntegrationStreamDecoderPtr prefillOutboundUpstreamQueue(uint32_t frame_count);
void triggerListenerDrain();
};
INSTANTIATE_TEST_SUITE_P(
IpVersions, Http2FloodMitigationTest,
testing::Combine(testing::ValuesIn(TestEnvironment::getIpVersionsForTest()), ::testing::Bool(),
::testing::Bool()),
testParamsToString);
void Http2FloodMitigationTest::initializeUpstreamFloodTest() {
setDownstreamProtocol(Http::CodecType::HTTP2);
setUpstreamProtocol(Http::CodecType::HTTP2);
// set lower upstream outbound frame limits to make tests run faster
config_helper_.setUpstreamOutboundFramesLimits(AllFrameFloodLimit, ControlFrameFloodLimit);
initialize();
}
void Http2FloodMitigationTest::setNetworkConnectionBufferSize() {
// nghttp2 library has its own internal mitigation for outbound control frames (see
// NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM). The default nghttp2 mitigation threshold of 1K is modified
// to 10K in the ConnectionImpl::Http2Options::Http2Options. The mitigation is triggered when
// there are more than 10000 PING or SETTINGS frames with ACK flag in the nghttp2 internal
// outbound queue. It is possible to trigger this mitigation in nghttp2 before triggering Envoy's
// own flood mitigation. This can happen when a buffer large enough to contain over 10K PING or
// SETTINGS frames is dispatched to the nghttp2 library. To prevent this from happening the
// network connection receive buffer needs to be smaller than 90Kb (which is 10K SETTINGS frames).
// Set it to the arbitrarily chosen value of 32K. Note that this buffer has 16K lower bound.
config_helper_.addConfigModifier([](envoy::config::bootstrap::v3::Bootstrap& bootstrap) -> void {
RELEASE_ASSERT(bootstrap.mutable_static_resources()->listeners_size() >= 1, "");
auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
listener->mutable_per_connection_buffer_limit_bytes()->set_value(32 * 1024);
});
}
void Http2FloodMitigationTest::beginSession() {
setDownstreamProtocol(Http::CodecType::HTTP2);
setUpstreamProtocol(Http::CodecType::HTTP2);
// set lower outbound frame limits to make tests run faster
config_helper_.setDownstreamOutboundFramesLimits(AllFrameFloodLimit, ControlFrameFloodLimit);
initialize();
// Set up a raw connection to easily send requests without reading responses. Also, set a small
// TCP receive buffer to speed up connection backup.
auto options = std::make_shared<Network::Socket::Options>();
options->emplace_back(std::make_shared<Network::SocketOptionImpl>(
envoy::config::core::v3::SocketOption::STATE_PREBIND,
ENVOY_MAKE_SOCKET_OPTION_NAME(SOL_SOCKET, SO_RCVBUF), 1024));
write_matcher_->setSourcePort(lookupPort("http"));
tcp_client_ = makeTcpConnection(lookupPort("http"), options);
startHttp2Session();
}
std::vector<char> Http2FloodMitigationTest::serializeFrames(const Http2Frame& frame,
uint32_t num_frames) {
std::vector<char> buf(num_frames * frame.size());
for (auto pos = buf.begin(); pos != buf.end();) {
pos = std::copy(frame.begin(), frame.end(), pos);
}
return buf;
}
// Verify that the server detects the flood of the given frame.
void Http2FloodMitigationTest::floodServer(const Http2Frame& frame, const std::string& flood_stat,
uint32_t num_frames) {
auto buf = serializeFrames(frame, num_frames);
ASSERT_TRUE(tcp_client_->write({buf.begin(), buf.end()}, false, false));
// Envoy's flood mitigation should kill the connection
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter(flood_stat)->value());
test_server_->waitForCounterGe("http.config_test.downstream_cx_delayed_close_timeout", 1);
}
// Send header only request, flood client, and verify that the upstream is disconnected and client
// receives 502.
void Http2FloodMitigationTest::floodClient(const Http2Frame& frame, uint32_t num_frames,
const std::string& flood_stat) {
codec_client_ = makeHttpConnection(lookupPort("http"));
auto response = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
waitForNextUpstreamRequest();
// Make Envoy's writes into the upstream connection to return EAGAIN
write_matcher_->setDestinationPort(fake_upstreams_[0]->localAddress()->ip()->port());
auto buf = serializeFrames(frame, num_frames);
write_matcher_->setWriteReturnsEgain();
auto* upstream = fake_upstreams_.front().get();
ASSERT_TRUE(upstream->rawWriteConnection(0, std::string(buf.begin(), buf.end())));
// Upstream connection should be disconnected
ASSERT_TRUE(fake_upstream_connection_->waitForDisconnect());
// Downstream client should receive 502 since upstream did not send response headers yet
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ("502", response->headers().getStatusValue());
EXPECT_EQ(response->headers().getProxyStatusValue(),
"envoy; error=http_protocol_error; "
"details=\"upstream_reset_before_response_started{protocol_error}; UPE\"");
if (!flood_stat.empty()) {
EXPECT_EQ(1, test_server_->counter(flood_stat)->value());
}
}
// Verify that the server detects the flood using specified request parameters.
void Http2FloodMitigationTest::floodServer(absl::string_view host, absl::string_view path,
Http2Frame::ResponseStatus expected_http_status,
const std::string& flood_stat, uint32_t num_frames) {
uint32_t request_idx = 0;
auto request = Http2Frame::makeRequest(Http2Frame::makeClientStreamId(request_idx), host, path);
sendFrame(request);
auto frame = readFrame();
EXPECT_EQ(Http2Frame::Type::Headers, frame.type());
EXPECT_EQ(expected_http_status, frame.responseStatus());
write_matcher_->setWriteReturnsEgain();
for (uint32_t frame = 0; frame < num_frames; ++frame) {
request = Http2Frame::makeRequest(Http2Frame::makeClientStreamId(++request_idx), host, path);
sendFrame(request);
}
tcp_client_->waitForDisconnect();
if (!flood_stat.empty()) {
EXPECT_EQ(1, test_server_->counter(flood_stat)->value());
}
EXPECT_EQ(1,
test_server_->counter("http.config_test.downstream_cx_delayed_close_timeout")->value());
}
void Http2FloodMitigationTest::prefillOutboundDownstreamQueue(uint32_t data_frame_count,
uint32_t data_frame_size) {
// Set large buffer limits so the test is not affected by the flow control.
config_helper_.setBufferLimits(1024 * 1024 * 1024, 1024 * 1024 * 1024);
autonomous_upstream_ = true;
autonomous_allow_incomplete_streams_ = true;
beginSession();
// Do not read from the socket and send request that causes autonomous upstream to respond
// with the specified number of DATA frames. This pre-fills downstream outbound frame queue
// such the next response triggers flood protection.
// Simulate TCP push back on the Envoy's downstream network socket, so that outbound frames
// start to accumulate in the transport socket buffer.
write_matcher_->setWriteReturnsEgain();
const auto request = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(0), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", absl::StrCat(data_frame_count)),
Http2Frame::Header("response_size_bytes", absl::StrCat(data_frame_size)),
Http2Frame::Header("no_trailers", "0")});
sendFrame(request);
// Wait for some data to arrive and then wait for the upstream_rq_active to flip to 0 to indicate
// that the first request has completed.
test_server_->waitForCounterGe("cluster.cluster_0.upstream_cx_rx_bytes_total", 10000);
test_server_->waitForGaugeEq("cluster.cluster_0.upstream_rq_active", 0);
// Verify that pre-fill did not trigger flood protection
EXPECT_EQ(0, test_server_->counter("http2.outbound_flood")->value());
}
IntegrationStreamDecoderPtr
Http2FloodMitigationTest::prefillOutboundUpstreamQueue(uint32_t frame_count) {
// This complex exchange below is to ensure that the upstream outbound queue is empty before
// forcing upstream socket to return EAGAIN. Envoy's upstream codec will send a few frames (i.e.
// SETTINGS and ACKs) after a new stream was established, and the test needs to make sure these
// are flushed into the socket. To do so the test goes through the following steps:
// 1. send request headers, do not end stream
// 2. wait for headers to be received by the upstream and send response headers without ending
// the stream
// 3. wait for the client to receive response headers
// 4. send 1 byte of data from the client
// 5. wait for 1 byte of data at the upstream. Receiving this DATA frame means that all other
// frames that Envoy sent before it were also received by the upstream and the Envoy's upstream
// outbound queue is empty.
codec_client_ = makeHttpConnection(lookupPort("http"));
auto encoder_decoder = codec_client_->startRequest(default_request_headers_);
request_encoder_ = &encoder_decoder.first;
auto response = std::move(encoder_decoder.second);
EXPECT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
EXPECT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
EXPECT_TRUE(upstream_request_->waitForHeadersComplete());
upstream_request_->encodeHeaders(default_response_headers_, false);
response->waitForHeaders();
EXPECT_EQ("200", response->headers().getStatusValue());
codec_client_->sendData(*request_encoder_, 1, false);
EXPECT_TRUE(upstream_request_->waitForData(*dispatcher_, 1));
// Make Envoy's writes into the upstream connection to return EAGAIN
write_matcher_->setDestinationPort(fake_upstreams_[0]->localAddress()->ip()->port());
auto buf = serializeFrames(Http2Frame::makePingFrame(), frame_count);
write_matcher_->setWriteReturnsEgain();
auto* upstream = fake_upstreams_.front().get();
EXPECT_TRUE(upstream->rawWriteConnection(0, std::string(buf.begin(), buf.end())));
// Wait for pre-fill data to arrive to Envoy
test_server_->waitForCounterGe("cluster.cluster_0.upstream_cx_rx_bytes_total", 500);
// Verify that pre-fill did not kill upstream connection.
EXPECT_TRUE(fake_upstream_connection_->connected());
return response;
}
void Http2FloodMitigationTest::triggerListenerDrain() {
absl::Notification drain_sequence_started;
test_server_->server().dispatcher().post([this, &drain_sequence_started]() {
test_server_->drainManager().startDrainSequence([] {});
drain_sequence_started.Notify();
});
drain_sequence_started.WaitForNotification();
}
TEST_P(Http2FloodMitigationTest, Ping) {
setNetworkConnectionBufferSize();
beginSession();
write_matcher_->setWriteReturnsEgain();
floodServer(Http2Frame::makePingFrame(), "http2.outbound_control_flood",
ControlFrameFloodLimit + 1);
}
TEST_P(Http2FloodMitigationTest, Settings) {
setNetworkConnectionBufferSize();
beginSession();
write_matcher_->setWriteReturnsEgain();
floodServer(Http2Frame::makeEmptySettingsFrame(), "http2.outbound_control_flood",
ControlFrameFloodLimit + 1);
}
// Verify that the server can detect flood of internally generated 404 responses.
TEST_P(Http2FloodMitigationTest, 404) {
// Change the default route to be restrictive, and send a request to a non existent route.
config_helper_.setDefaultHostAndRoute("foo.com", "/found");
beginSession();
// Send requests to a non existent path to generate 404s
floodServer("host", "/notfound", Http2Frame::ResponseStatus::NotFound, "http2.outbound_flood",
AllFrameFloodLimit + 1);
}
// Verify that the server can detect flood of response DATA frames
TEST_P(Http2FloodMitigationTest, Data) {
auto buffer_factory = std::make_shared<Buffer::TrackedWatermarkBufferFactory>();
setServerBufferFactory(buffer_factory);
// Set large buffer limits so the test is not affected by the flow control.
config_helper_.setBufferLimits(1024 * 1024 * 1024, 1024 * 1024 * 1024);
autonomous_upstream_ = true;
autonomous_allow_incomplete_streams_ = true;
beginSession();
// Do not read from the socket and send request that causes autonomous upstream
// to respond with 1000 DATA frames. The Http2FloodMitigationTest::beginSession()
// sets 1000 flood limit for all frame types. Including 1 HEADERS response frame
// 1000 DATA frames should trigger flood protection.
// Simulate TCP push back on the Envoy's downstream network socket, so that outbound frames start
// to accumulate in the transport socket buffer.
write_matcher_->setWriteReturnsEgain();
const auto request = Http2Frame::makeRequest(1, "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "1000"),
Http2Frame::Header("response_size_bytes", "1"),
Http2Frame::Header("no_trailers", "0")});
sendFrame(request);
// Wait for connection to be flooded with outbound DATA frames and disconnected.
tcp_client_->waitForDisconnect();
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
// The factory will be used to create 4 buffers: the input and output buffers for request and
// response pipelines.
EXPECT_EQ(8, buffer_factory->numBuffersCreated());
// Expect at least 1000 1 byte data frames in the output buffer. Each data frame comes with a
// 9-byte frame header; 10 bytes per data frame, 10000 bytes total. The output buffer should also
// contain response headers, which should be less than 100 bytes.
EXPECT_LE(10000, buffer_factory->maxBufferSize());
EXPECT_GE(10100, buffer_factory->maxBufferSize());
// The response pipeline input buffer could end up with the full upstream response in 1 go, but
// there are no guarantees of that being the case.
EXPECT_LE(10000, buffer_factory->sumMaxBufferSizes());
// The max size of the input and output buffers used in the response pipeline is around 10kb each.
EXPECT_GE(22000, buffer_factory->sumMaxBufferSizes());
// Verify that all buffers have watermarks set.
EXPECT_THAT(buffer_factory->highWatermarkRange(),
testing::Pair(256 * 1024 * 1024, 1024 * 1024 * 1024));
}
// Verify that the server can detect flood triggered by a DATA frame from a decoder filter call
// to sendLocalReply().
// This test also verifies that RELEASE_ASSERT in the ConnectionImpl::StreamImpl::encodeDataHelper()
// is not fired when it is called by the sendLocalReply() in the dispatching context.
TEST_P(Http2FloodMitigationTest, DataOverflowFromDecoderFilterSendLocalReply) {
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
const std::string yaml_string = R"EOF(
name: send_local_reply_filter
typed_config:
"@type": type.googleapis.com/test.integration.filters.SetResponseCodeFilterConfig
prefix: "/call_send_local_reply"
code: 404
body: "something"
)EOF";
TestUtility::loadFromYaml(yaml_string, *hcm.add_http_filters());
// keep router the last
auto size = hcm.http_filters_size();
hcm.mutable_http_filters()->SwapElements(size - 2, size - 1);
});
// pre-fill 2 away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 2);
// At this point the outbound downstream frame queue should be 2 away from overflowing.
// Make the SetResponseCodeFilterConfig decoder filter call sendLocalReply with body.
// HEADERS + DATA frames should overflow the queue.
// Verify that connection was disconnected and appropriate counters were set.
auto request2 =
Http2Frame::makeRequest(Http2Frame::makeClientStreamId(1), "host", "/call_send_local_reply");
sendFrame(request2);
// Wait for connection to be flooded with outbound DATA frame and disconnected.
tcp_client_->waitForDisconnect();
// Verify that the upstream connection is still alive.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server can detect flood of response HEADERS frames
TEST_P(Http2FloodMitigationTest, Headers) {
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
// Send second request which should trigger headers only response.
// Verify that connection was disconnected and appropriate counters were set.
auto request2 = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(1), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "0"), Http2Frame::Header("no_trailers", "0")});
sendFrame(request2);
// Wait for connection to be flooded with outbound HEADERS frame and disconnected.
tcp_client_->waitForDisconnect();
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server can detect overflow by 100 continue response sent by Envoy itself
TEST_P(Http2FloodMitigationTest, Envoy1xxHeaders) {
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
// Send second request which should trigger Envoy to respond with 100 continue.
// Verify that connection was disconnected and appropriate counters were set.
auto request2 = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(1), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "0"), Http2Frame::Header("no_trailers", "0"),
Http2Frame::Header("expect", "100-continue")});
sendFrame(request2);
// Wait for connection to be flooded with outbound HEADERS frame and disconnected.
tcp_client_->waitForDisconnect();
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// The second upstream request should be reset since it is disconnected when sending 100 continue
// response
EXPECT_EQ(1, test_server_->counter("cluster.cluster_0.upstream_rq_tx_reset")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server can detect flood triggered by a HEADERS frame from a decoder filter call
// to sendLocalReply().
// This test also verifies that RELEASE_ASSERT in the
// ConnectionImpl::StreamImpl::encodeHeadersBase() is not fired when it is called by the
// sendLocalReply() in the dispatching context.
TEST_P(Http2FloodMitigationTest, HeadersOverflowFromDecoderFilterSendLocalReply) {
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
const std::string yaml_string = R"EOF(
name: send_local_reply_filter
typed_config:
"@type": type.googleapis.com/test.integration.filters.SetResponseCodeFilterConfig
prefix: "/call_send_local_reply"
code: 404
)EOF";
TestUtility::loadFromYaml(yaml_string, *hcm.add_http_filters());
// keep router the last
auto size = hcm.http_filters_size();
hcm.mutable_http_filters()->SwapElements(size - 2, size - 1);
});
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
// At this point the outbound downstream frame queue should be 1 away from overflowing.
// Make the SetResponseCodeFilterConfig decoder filter call sendLocalReply without body.
// Verify that connection was disconnected and appropriate counters were set.
auto request2 =
Http2Frame::makeRequest(Http2Frame::makeClientStreamId(1), "host", "/call_send_local_reply");
sendFrame(request2);
// Wait for connection to be flooded with outbound HEADERS frame and disconnected.
tcp_client_->waitForDisconnect();
// Verify that the upstream connection is still alive.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// TODO(yanavlasov): add the same tests as above for the encoder filters.
// This is currently blocked by the https://github.com/envoyproxy/envoy/pull/13256
// Verify that the server can detect flood of response METADATA frames
TEST_P(Http2FloodMitigationTest, Metadata) {
config_helper_.addConfigModifier([&](envoy::config::bootstrap::v3::Bootstrap& bootstrap) -> void {
RELEASE_ASSERT(bootstrap.mutable_static_resources()->clusters_size() >= 1, "");
ConfigHelper::HttpProtocolOptions protocol_options;
protocol_options.mutable_explicit_http_config()
->mutable_http2_protocol_options()
->set_allow_metadata(true);
ConfigHelper::setProtocolOptions(*bootstrap.mutable_static_resources()->mutable_clusters(0),
protocol_options);
});
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void { hcm.mutable_http2_protocol_options()->set_allow_metadata(true); });
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
// Send second request which should trigger response with METADATA frame.
auto metadata_map_vector_ptr = std::make_unique<Http::MetadataMapVector>();
Http::MetadataMap metadata_map = {
{"header_key1", "header_value1"},
{"header_key2", "header_value2"},
};
auto metadata_map_ptr = std::make_unique<Http::MetadataMap>(metadata_map);
metadata_map_vector_ptr->push_back(std::move(metadata_map_ptr));
static_cast<AutonomousUpstream*>(fake_upstreams_.front().get())
->setPreResponseHeadersMetadata(std::move(metadata_map_vector_ptr));
// Verify that connection was disconnected and appropriate counters were set.
auto request2 = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(1), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "0"), Http2Frame::Header("no_trailers", "0")});
sendFrame(request2);
// Wait for connection to be flooded with outbound METADATA frame and disconnected.
tcp_client_->waitForDisconnect();
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server can detect flood of response trailers.
TEST_P(Http2FloodMitigationTest, Trailers) {
// Set large buffer limits so the test is not affected by the flow control.
config_helper_.setBufferLimits(1024 * 1024 * 1024, 1024 * 1024 * 1024);
autonomous_upstream_ = true;
autonomous_allow_incomplete_streams_ = true;
beginSession();
// Do not read from the socket and send request that causes autonomous upstream
// to respond with 999 DATA frames and trailers. The Http2FloodMitigationTest::beginSession()
// sets 1000 flood limit for all frame types. Including 1 HEADERS response frame
// 999 DATA frames and trailers should trigger flood protection.
// Simulate TCP push back on the Envoy's downstream network socket, so that outbound frames start
// to accumulate in the transport socket buffer.
write_matcher_->setWriteReturnsEgain();
static_cast<AutonomousUpstream*>(fake_upstreams_.front().get())
->setResponseTrailers(std::make_unique<Http::TestResponseTrailerMapImpl>(
Http::TestResponseTrailerMapImpl({{"foo", "bar"}})));
const auto request =
Http2Frame::makeRequest(Http2Frame::makeClientStreamId(0), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "999")});
sendFrame(request);
// Wait for connection to be flooded with outbound trailers and disconnected.
tcp_client_->waitForDisconnect();
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify flood detection by the WINDOW_UPDATE frame when a decoder filter is resuming reading from
// the downstream via DecoderFilterBelowWriteBufferLowWatermark.
TEST_P(Http2FloodMitigationTest, WindowUpdateOnLowWatermarkFlood) {
// This test depends on data flowing through a backed up stream eagerly (e.g. the
// backpressure-filter triggers above watermark when it receives headers from
// the downstream, and only goes below watermark if the response body has
// passed through the filter.). With defer processing of backed up streams however
// the data won't be eagerly processed as the stream is backed up.
// TODO(kbaichoo): Remove this test when removing this feature tag.
if (deferredProcessing(GetParam())) {
return;
}
config_helper_.prependFilter(R"EOF(
name: backpressure-filter
)EOF");
config_helper_.setBufferLimits(1024 * 1024 * 1024, 1024 * 1024 * 1024);
// Set low window sizes in the server codec as nghttp2 sends WINDOW_UPDATE only after it consumes
// more than 25% of the window.
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
auto* h2_options = hcm.mutable_http2_protocol_options();
h2_options->mutable_initial_stream_window_size()->set_value(70000);
h2_options->mutable_initial_connection_window_size()->set_value(70000);
});
autonomous_upstream_ = true;
autonomous_allow_incomplete_streams_ = true;
beginSession();
write_matcher_->setWriteReturnsEgain();
// pre-fill two away from overflow
const auto request = Http2Frame::makePostRequest(
Http2Frame::makeClientStreamId(0), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "998"), Http2Frame::Header("no_trailers", "0")});
sendFrame(request);
// The backpressure-filter disables reading when it sees request headers, and it should prevent
// WINDOW_UPDATE to be sent on the following DATA frames. Send enough DATA to consume more than
// 25% of the 70K window so that nghttp2 will send WINDOW_UPDATE on read resumption.
auto data_frame =
Http2Frame::makeDataFrame(Http2Frame::makeClientStreamId(0), std::string(16384, '0'));
sendFrame(data_frame);
sendFrame(data_frame);
data_frame = Http2Frame::makeDataFrame(Http2Frame::makeClientStreamId(0), std::string(16384, '1'),
Http2Frame::DataFlags::EndStream);
sendFrame(data_frame);
// Upstream will respond with 998 DATA frames and the backpressure-filter filter will re-enable
// reading on the last DATA frame. This will cause nghttp2 to send two WINDOW_UPDATE frames for
// stream and connection windows. Together with response DATA frames it should overflow outbound
// frame queue. Wait for connection to be flooded with outbound WINDOW_UPDATE frame and
// disconnected.
tcp_client_->waitForDisconnect();
EXPECT_EQ(1,
test_server_->counter("http.config_test.downstream_flow_control_paused_reading_total")
->value());
// If the server codec had incorrectly thrown an exception on flood detection it would cause
// the entire upstream to be disconnected. Verify it is still active, and there are no destroyed
// connections.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// TODO(yanavlasov): add tests for WINDOW_UPDATE overflow from the router filter. These tests need
// missing support for write resumption from test sockets that were forced to return EAGAIN by the
// test.
// Verify that the server can detect flood of RST_STREAM frames.
TEST_P(Http2FloodMitigationTest, RST_STREAM) {
// Use invalid HTTP headers to trigger sending RST_STREAM frames.
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
hcm.mutable_http2_protocol_options()
->mutable_override_stream_error_on_invalid_http_message()
->set_value(true);
});
beginSession();
uint32_t stream_index = 0;
auto request =
Http::Http2::Http2Frame::makeMalformedRequest(Http2Frame::makeClientStreamId(stream_index));
sendFrame(request);
auto response = readFrame();
// Make sure we've got RST_STREAM from the server
EXPECT_EQ(Http2Frame::Type::RstStream, response.type());
// Simulate TCP push back on the Envoy's downstream network socket, so that outbound frames start
// to accumulate in the transport socket buffer.
write_matcher_->setWriteReturnsEgain();
for (++stream_index; stream_index < ControlFrameFloodLimit + 2; ++stream_index) {
request =
Http::Http2::Http2Frame::makeMalformedRequest(Http2Frame::makeClientStreamId(stream_index));
sendFrame(request);
}
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.outbound_control_flood")->value());
EXPECT_EQ(1,
test_server_->counter("http.config_test.downstream_cx_delayed_close_timeout")->value());
}
// Verify detection of flood by the RST_STREAM frame sent on pending flush timeout
TEST_P(Http2FloodMitigationTest, RstStreamOverflowOnPendingFlushTimeout) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
hcm.mutable_stream_idle_timeout()->set_seconds(0);
constexpr uint64_t IdleTimeoutMs = 400;
hcm.mutable_stream_idle_timeout()->set_nanos(IdleTimeoutMs * 1000 * 1000);
});
// Pending flush timer is started when upstream response has completed but there is no window to
// send DATA downstream. The test downstream client does not update WINDOW and as such Envoy will
// use the default 65535 bytes. First, pre-fill outbound queue with 65 byte frames, which should
// consume 65 * 997 = 64805 bytes of downstream connection window.
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 3, 65);
// At this point the outbound downstream frame queue should be 3 away from overflowing with 730
// byte window. Make response to be 1 DATA frame with 1024 payload. This should overflow the
// available downstream window and start pending flush timer. Envoy proxies 2 frames downstream,
// HEADERS and partial DATA frame, which makes the frame queue 1 away from overflow.
const auto request2 = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(1), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "1"),
Http2Frame::Header("response_size_bytes", "1024"), Http2Frame::Header("no_trailers", "0")});
sendFrame(request2);
// Pending flush timer sends RST_STREAM frame which should overflow outbound frame queue and
// disconnect the connection.
tcp_client_->waitForDisconnect();
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
// Verify that pending flush timeout was hit
EXPECT_EQ(1, test_server_->counter("http2.tx_flush_timeout")->value());
}
// Verify detection of frame flood when sending second GOAWAY frame on drain timeout
TEST_P(Http2FloodMitigationTest, GoAwayOverflowOnDrainTimeout) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
auto* drain_time_out = hcm.mutable_drain_timeout();
std::chrono::milliseconds timeout(1000);
auto seconds = std::chrono::duration_cast<std::chrono::seconds>(timeout);
drain_time_out->set_seconds(seconds.count());
auto* http_protocol_options = hcm.mutable_common_http_protocol_options();
auto* idle_time_out = http_protocol_options->mutable_idle_timeout();
idle_time_out->set_seconds(seconds.count());
});
// pre-fill two away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 2);
// connection idle timeout will send first GOAWAY frame and start drain timer
// drain timeout will send second GOAWAY frame which should trigger flood protection
// Wait for connection to be flooded with outbound GOAWAY frame and disconnected.
tcp_client_->waitForDisconnect();
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify detection of overflowing outbound frame queue with the GOAWAY frames sent after the
// downstream idle connection timeout disconnects the connection.
// The test verifies protocol constraint violation handling in the
// Http2::ConnectionImpl::shutdownNotice() method.
TEST_P(Http2FloodMitigationTest, DownstreamIdleTimeoutTriggersFloodProtection) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
auto* http_protocol_options = hcm.mutable_common_http_protocol_options();
auto* idle_time_out = http_protocol_options->mutable_idle_timeout();
std::chrono::milliseconds timeout(1000);
auto seconds = std::chrono::duration_cast<std::chrono::seconds>(timeout);
idle_time_out->set_seconds(seconds.count());
});
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
EXPECT_EQ(1, test_server_->counter("http.config_test.downstream_cx_idle_timeout")->value());
}
// Verify detection of overflowing outbound frame queue with the GOAWAY frames sent after the
// downstream connection duration timeout disconnects the connection.
// The test verifies protocol constraint violation handling in the
// Http2::ConnectionImpl::shutdownNotice() method.
TEST_P(Http2FloodMitigationTest, DownstreamConnectionDurationTimeoutTriggersFloodProtection) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
auto* http_protocol_options = hcm.mutable_common_http_protocol_options();
auto* max_connection_duration = http_protocol_options->mutable_max_connection_duration();
std::chrono::milliseconds timeout(1000);
auto seconds = std::chrono::duration_cast<std::chrono::seconds>(timeout);
max_connection_duration->set_seconds(seconds.count());
});
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
EXPECT_EQ(1,
test_server_->counter("http.config_test.downstream_cx_max_duration_reached")->value());
}
// Verify detection of frame flood when sending GOAWAY frame during processing of response headers
// on a draining listener.
TEST_P(Http2FloodMitigationTest, GoawayOverflowDuringResponseWhenDraining) {
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
triggerListenerDrain();
// Send second request which should trigger Envoy to send GOAWAY (since it is in the draining
// state) when processing response headers. Verify that connection was disconnected and
// appropriate counters were set.
auto request2 =
Http2Frame::makeRequest(Http2Frame::makeClientStreamId(1), "host", "/test/long/url");
sendFrame(request2);
// Wait for connection to be flooded with outbound GOAWAY frame and disconnected.
tcp_client_->waitForDisconnect();
// Verify that the upstream connection is still alive.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
EXPECT_EQ(1, test_server_->counter("http.config_test.downstream_cx_drain_close")->value());
}
// Verify detection of frame flood when sending GOAWAY frame during call to sendLocalReply()
// from decoder filter on a draining listener.
TEST_P(Http2FloodMitigationTest, GoawayOverflowFromDecoderFilterSendLocalReplyWhenDraining) {
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
const std::string yaml_string = R"EOF(
name: send_local_reply_filter
typed_config:
"@type": type.googleapis.com/test.integration.filters.SetResponseCodeFilterConfig
prefix: "/call_send_local_reply"
code: 404
)EOF";
TestUtility::loadFromYaml(yaml_string, *hcm.add_http_filters());
// keep router the last
auto size = hcm.http_filters_size();
hcm.mutable_http_filters()->SwapElements(size - 2, size - 1);
});
// pre-fill one away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
triggerListenerDrain();
// At this point the outbound downstream frame queue should be 1 away from overflowing.
// Make the SetResponseCodeFilterConfig decoder filter call sendLocalReply without body which
// should trigger Envoy to send GOAWAY (since it is in the draining state) when processing
// sendLocalReply() headers. Verify that connection was disconnected and appropriate counters were
// set.
auto request2 =
Http2Frame::makeRequest(Http2Frame::makeClientStreamId(1), "host", "/call_send_local_reply");
sendFrame(request2);
// Wait for connection to be flooded with outbound GOAWAY frame and disconnected.
tcp_client_->waitForDisconnect();
// Verify that the upstream connection is still alive.
ASSERT_EQ(1, test_server_->gauge("cluster.cluster_0.upstream_cx_active")->value());
ASSERT_EQ(0, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
EXPECT_EQ(1, test_server_->counter("http.config_test.downstream_cx_drain_close")->value());
}
// Verify that the server can detect flooding by the RST_STREAM on when upstream disconnects
// before sending response headers.
TEST_P(Http2FloodMitigationTest, RstStreamOnUpstreamRemoteCloseBeforeResponseHeaders) {
// pre-fill 3 away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 3);
// Start second request.
auto request2 =
Http2Frame::makePostRequest(Http2Frame::makeClientStreamId(1), "host", "/test/long/url");
sendFrame(request2);
// Wait for it to be proxied
test_server_->waitForCounterGe("cluster.cluster_0.upstream_rq_total", 2);
// Disconnect upstream connection. Since there no response headers were sent yet the router
// filter will send 503 with body and then RST_STREAM. With these 3 frames the downstream outbound
// frame queue should overflow.
ASSERT_TRUE(static_cast<AutonomousUpstream*>(fake_upstreams_.front().get())->closeConnection(0));
// Wait for connection to be flooded with outbound RST_STREAM frame and disconnected.
tcp_client_->waitForDisconnect();
ASSERT_EQ(1, test_server_->counter("cluster.cluster_0.upstream_cx_destroy")->value());
// Verify that the flood check was triggered
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server can detect flooding by the RST_STREAM on stream idle timeout
// after sending response headers.
TEST_P(Http2FloodMitigationTest, RstStreamOnStreamIdleTimeoutAfterResponseHeaders) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
auto* stream_idle_timeout = hcm.mutable_stream_idle_timeout();
std::chrono::milliseconds timeout(1000);
auto seconds = std::chrono::duration_cast<std::chrono::seconds>(timeout);
stream_idle_timeout->set_seconds(seconds.count());
});
// pre-fill 2 away from overflow
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 2);
// Start second request, which should result in response headers to be sent but the stream kept
// open.
auto request2 = Http2Frame::makeRequest(
Http2Frame::makeClientStreamId(1), "host", "/test/long/url",
{Http2Frame::Header("response_data_blocks", "0"), Http2Frame::Header("no_end_stream", "0")});
sendFrame(request2);
// Wait for stream idle timeout to send RST_STREAM. With the response headers frame from the
// second response the downstream outbound frame queue should overflow.
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
EXPECT_EQ(1, test_server_->counter("http.config_test.downstream_rq_idle_timeout")->value());
}
// Verify detection of overflowing outbound frame queue with the PING frames sent by the keep alive
// timer. The test verifies protocol constraint violation handling in the
// Http2::ConnectionImpl::sendKeepalive() method.
TEST_P(Http2FloodMitigationTest, KeepAliveTimeeTriggersFloodProtection) {
DISABLE_UNDER_COVERAGE; // https://github.com/envoyproxy/envoy/issues/21019
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) {
auto* keep_alive = hcm.mutable_http2_protocol_options()->mutable_connection_keepalive();
keep_alive->mutable_interval()->set_nanos(500 * 1000 * 1000);
keep_alive->mutable_timeout()->set_seconds(1);
});
prefillOutboundDownstreamQueue(AllFrameFloodLimit - 1);
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.outbound_flood")->value());
}
// Verify that the server stop reading downstream connection on protocol error.
TEST_P(Http2FloodMitigationTest, TooManyStreams) {
config_helper_.addConfigModifier(
[](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
hcm.mutable_http2_protocol_options()->mutable_max_concurrent_streams()->set_value(2);
});
autonomous_upstream_ = true;
beginSession();
// To prevent Envoy from closing client streams the upstream connection needs to push back on
// writing by the upstream server. In this case Envoy will not see upstream responses and will
// keep client streams open, eventually maxing them out and causing client connection to be
// closed.
write_matcher_->setSourcePort(fake_upstreams_[0]->localAddress()->ip()->port());
// Exceed the number of streams allowed by the server. The server should stop reading from the
// client.
floodServer("host", "/test/long/url", Http2Frame::ResponseStatus::Ok, "", 3);
}
TEST_P(Http2FloodMitigationTest, EmptyHeaders) {
config_helper_.addConfigModifier(
[&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
hcm) -> void {
hcm.mutable_http2_protocol_options()
->mutable_max_consecutive_inbound_frames_with_empty_payload()
->set_value(0);
});
beginSession();
const auto request = Http2Frame::makeEmptyHeadersFrame(Http2Frame::makeClientStreamId(0));
sendFrame(request);
tcp_client_->waitForDisconnect();
EXPECT_EQ(1, test_server_->counter("http2.inbound_empty_frames_flood")->value());