backport to 1.16: proxy protocol: set downstreamRemoteAddress on Stre…

…amInfo

This fixes a regression which resulted in the downstreamRemoteAddress
on the StreamInfo for a connection not having the address supplied by
the proxy protocol filter, but instead having the address of the
directly connected peer.

This issue does not affect HTTP filters.

Fixes envoyproxy#14087

Signed-off-by: Greg Greenway <ggreenway@apple.com>

docs/root/version_history/current.rst

@@ -15,6 +15,8 @@ Bug Fixes
 * examples: examples use v3 configs.
 * listener: fix crash when disabling or re-enabling listeners due to overload while processing LDS updates.
 * proxy_proto: fixed a bug where the wrong downstream address got sent to upstream connections.
+* proxy_proto: fixed a bug where network filters would not have the correct downstreamRemoteAddress() when accessed from the StreamInfo. This could result in incorrect enforcement of RBAC rules in the RBAC network filter (but not in the RBAC HTTP filter), or incorrect access log addresses from tcp_proxy.
+* tls: fix detection of the upstream connection close event.
 * tls: fix read resumption after triggering buffer high-watermark and all remaining request/response bytes are stored in the SSL connection's internal buffers.
 * udp: fixed issue in which receiving truncated UDP datagrams would cause Envoy to crash.
 

source/server/connection_handler_impl.cc

@@ -437,6 +437,11 @@ void ConnectionHandlerImpl::ActiveTcpListener::resumeListening() {
 
 void ConnectionHandlerImpl::ActiveTcpListener::newConnection(
     Network::ConnectionSocketPtr&& socket, std::unique_ptr<StreamInfo::StreamInfo> stream_info) {
+  // Refresh addresses in case they are modified by listener filters, such as proxy protocol or
+  // original_dst.
+  stream_info->setDownstreamLocalAddress(socket->localAddress());
+  stream_info->setDownstreamRemoteAddress(socket->remoteAddress());
+
   // Find matching filter chain.
   const auto filter_chain = config_->filterChainManager().findFilterChain(*socket);
   if (filter_chain == nullptr) {

test/integration/BUILD

@@ -1036,10 +1036,14 @@ envoy_cc_test(
         ":http_integration_lib",
         "//source/common/buffer:buffer_lib",
         "//source/common/http:codec_client_lib",
+        "//source/extensions/access_loggers/file:config",
         "//source/extensions/filters/listener/proxy_protocol:config",
+        "//source/extensions/filters/network/tcp_proxy:config",
         "//test/test_common:utility_lib",
         "@envoy_api//envoy/config/bootstrap/v3:pkg_cc_proto",
         "@envoy_api//envoy/config/cluster/v3:pkg_cc_proto",
+        "@envoy_api//envoy/extensions/access_loggers/file/v3:pkg_cc_proto",
+        "@envoy_api//envoy/extensions/filters/network/tcp_proxy/v3:pkg_cc_proto",
     ],
 )
 

test/integration/proxy_proto_integration_test.cc

@@ -2,6 +2,8 @@
 
 #include "envoy/config/bootstrap/v3/bootstrap.pb.h"
 #include "envoy/config/cluster/v3/cluster.pb.h"
+#include "envoy/extensions/access_loggers/file/v3/file.pb.h"
+#include "envoy/extensions/filters/network/tcp_proxy/v3/tcp_proxy.pb.h"
 
 #include "common/buffer/buffer_impl.h"
 
@@ -14,6 +16,24 @@
 
 namespace Envoy {
 
+static void
+insertProxyProtocolFilterConfigModifier(envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
+  ::envoy::extensions::filters::listener::proxy_protocol::v3::ProxyProtocol proxy_protocol;
+  auto rule = proxy_protocol.add_rules();
+  rule->set_tlv_type(0x02);
+  rule->mutable_on_tlv_present()->set_key("PP2TypeAuthority");
+
+  auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
+  auto* ppv_filter = listener->add_listener_filters();
+  ppv_filter->set_name("envoy.listener.proxy_protocol");
+  ppv_filter->mutable_typed_config()->PackFrom(proxy_protocol);
+}
+
+ProxyProtoIntegrationTest::ProxyProtoIntegrationTest()
+    : HttpIntegrationTest(Http::CodecClient::Type::HTTP1, GetParam()) {
+  config_helper_.addConfigModifier(insertProxyProtocolFilterConfigModifier);
+}
+
 INSTANTIATE_TEST_SUITE_P(IpVersions, ProxyProtoIntegrationTest,
                          testing::ValuesIn(TestEnvironment::getIpVersionsForTest()),
                          TestUtility::ipTestParamsToString);
@@ -201,4 +221,61 @@ TEST_P(ProxyProtoIntegrationTest, ClusterProvided) {
   testRouterRequestAndResponseWithBody(1024, 512, false, false, &creator);
 }
 
+ProxyProtoTcpIntegrationTest::ProxyProtoTcpIntegrationTest()
+    : BaseIntegrationTest(GetParam(), ConfigHelper::tcpProxyConfig()) {
+  enable_half_close_ = true;
+
+  config_helper_.addConfigModifier(insertProxyProtocolFilterConfigModifier);
+  config_helper_.renameListener("tcp_proxy");
+}
+
+INSTANTIATE_TEST_SUITE_P(IpVersions, ProxyProtoTcpIntegrationTest,
+                         testing::ValuesIn(TestEnvironment::getIpVersionsForTest()),
+                         TestUtility::ipTestParamsToString);
+
+// This tests that the StreamInfo contains the correct addresses.
+TEST_P(ProxyProtoTcpIntegrationTest, AccessLog) {
+  std::string access_log_path = TestEnvironment::temporaryPath(
+      fmt::format("access_log{}.txt", version_ == Network::Address::IpVersion::v4 ? "v4" : "v6"));
+  config_helper_.addConfigModifier([&](envoy::config::bootstrap::v3::Bootstrap& bootstrap) -> void {
+    auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
+    auto* filter_chain = listener->mutable_filter_chains(0);
+    auto* config_blob = filter_chain->mutable_filters(0)->mutable_typed_config();
+
+    ASSERT_TRUE(
+        config_blob
+            ->Is<API_NO_BOOST(envoy::extensions::filters::network::tcp_proxy::v3::TcpProxy)>());
+    auto tcp_proxy_config = MessageUtil::anyConvert<API_NO_BOOST(
+        envoy::extensions::filters::network::tcp_proxy::v3::TcpProxy)>(*config_blob);
+
+    auto* access_log = tcp_proxy_config.add_access_log();
+    access_log->set_name("accesslog");
+    envoy::extensions::access_loggers::file::v3::FileAccessLog access_log_config;
+    access_log_config.set_path(access_log_path);
+    access_log_config.mutable_log_format()->set_text_format(
+        "remote=%DOWNSTREAM_REMOTE_ADDRESS% local=%DOWNSTREAM_LOCAL_ADDRESS%");
+    access_log->mutable_typed_config()->PackFrom(access_log_config);
+    config_blob->PackFrom(tcp_proxy_config);
+  });
+  initialize();
+
+  IntegrationTcpClientPtr tcp_client = makeTcpConnection(lookupPort("tcp_proxy"));
+  ASSERT_TRUE(tcp_client->write("PROXY TCP4 1.2.3.4 254.254.254.254 12345 1234\r\nhello", true));
+
+  FakeRawConnectionPtr fake_upstream_connection;
+  ASSERT_TRUE(fake_upstreams_[0]->waitForRawConnection(fake_upstream_connection));
+  ASSERT_TRUE(fake_upstream_connection->waitForHalfClose());
+  ASSERT_TRUE(fake_upstream_connection->write("", true));
+  tcp_client->waitForHalfClose();
+  ASSERT_TRUE(fake_upstream_connection->waitForDisconnect());
+
+  std::string log_result;
+  // Access logs only get flushed to disk periodically, so poll until the log is non-empty
+  do {
+    log_result = api_->fileSystem().fileReadToEnd(access_log_path);
+  } while (log_result.empty());
+
+  EXPECT_EQ(log_result, "remote=1.2.3.4:12345 local=254.254.254.254:1234");
+}
+
 } // namespace Envoy

test/integration/proxy_proto_integration_test.h

@@ -16,19 +16,13 @@ namespace Envoy {
 class ProxyProtoIntegrationTest : public testing::TestWithParam<Network::Address::IpVersion>,
                                   public HttpIntegrationTest {
 public:
-  ProxyProtoIntegrationTest() : HttpIntegrationTest(Http::CodecClient::Type::HTTP1, GetParam()) {
-    config_helper_.addConfigModifier(
-        [&](envoy::config::bootstrap::v3::Bootstrap& bootstrap) -> void {
-          ::envoy::extensions::filters::listener::proxy_protocol::v3::ProxyProtocol proxy_protocol;
-          auto rule = proxy_protocol.add_rules();
-          rule->set_tlv_type(0x02);
-          rule->mutable_on_tlv_present()->set_key("PP2TypeAuthority");
-
-          auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
-          auto* ppv_filter = listener->add_listener_filters();
-          ppv_filter->set_name("envoy.listener.proxy_protocol");
-          ppv_filter->mutable_typed_config()->PackFrom(proxy_protocol);
-        });
-  }
+  ProxyProtoIntegrationTest();
 };
+
+class ProxyProtoTcpIntegrationTest : public testing::TestWithParam<Network::Address::IpVersion>,
+                                     public BaseIntegrationTest {
+public:
+  ProxyProtoTcpIntegrationTest();
+};
+
 } // namespace Envoy