Fix Listener Filter bugs and cover more Envoy Listener Filter Types

CHANGELOG.md

@@ -37,10 +37,14 @@ IMPROVEMENTS:
   * Display clusters by their short names rather than FQDNs for the `proxy read` command. [[GH-1412](https://github.com/hashicorp/consul-k8s/pull/1412)]
   * Display a message when `proxy list` returns no results. [[GH-1412](https://github.com/hashicorp/consul-k8s/pull/1412)]
   * Display a warning when a user passes a field and table filter combination to `proxy read` where the given field is not present in any of the output tables. [[GH-1412](https://github.com/hashicorp/consul-k8s/pull/1412)]
+  * Extend the timeout for `consul-k8s proxy read` to establish a connection from 5s to 10s.
+  * Expand the set of Envoy Listener Filters that may be parsed and output to the Listeners table.
 
 BUG FIXES:
 * Helm
   * API Gateway: Configure ACL auth for controller correctly when deployed in secondary datacenter with federation enabled [[GH-1462](https://github.com/hashicorp/consul-k8s/pull/1462)]
+* CLI
+  * Fix issue where SNI filters for Terminating Gateways showed up as blank lines.
 
 ## 0.47.1 (August 12, 2022)
 

acceptance/tests/connect/connect_inject_test.go

@@ -114,7 +114,7 @@ func TestConnectInject(t *testing.T) {
 					// Static Client must have Static Server as a cluster and endpoint.
 					if strings.Contains(podName, "static-client") {
 						require.Regexp(r, "static-server.*static-server\\.default\\.dc1\\.internal.*EDS", output)
-						require.Regexp(r, ipv4RegEx+".*static-server.default.dc1.internal", output)
+						require.Regexp(r, ipv4RegEx+".*static-server", output)
 					}
 
 				}

cli/cmd/proxy/read/command.go

@@ -413,12 +413,15 @@ func (c *ReadCommand) outputJSON(configs map[string]*EnvoyConfig) error {
 		cfgs[name] = cfg
 	}
 
-	out, err := json.MarshalIndent(cfgs, "", "\t")
+	escaped, err := json.MarshalIndent(cfgs, "", "\t")
 	if err != nil {
 		return err
 	}
 
-	c.UI.Output(string(out))
+	// Unescape `>` the cheap way.
+	out := strings.ReplaceAll(string(escaped), "\\u003e", ">")
+
+	c.UI.Output(out)
 
 	return nil
 }

cli/cmd/proxy/read/command_test.go

@@ -80,10 +80,10 @@ func TestReadCommandOutput(t *testing.T) {
 
 		"-listeners": {"==> Listeners \\(2\\)",
 			"Name.*Address:Port.*Direction.*Filter Chain Match.*Filters.*Last Updated",
-			"public_listener.*192\\.168\\.69\\.179:20000.*INBOUND.*Any.*\\* to local_app/",
-			"outbound_listener.*127.0.0.1:15001.*OUTBOUND.*10\\.100\\.134\\.173/32, 240\\.0\\.0\\.3/32.*to client.default.dc1.internal.bc3815c2-1a0f-f3ff-a2e9-20d791f08d00.consul",
-			"10\\.100\\.31\\.2/32, 240\\.0\\.0\\.5/32.*to frontend\\.default\\.dc1\\.internal\\.bc3815c2-1a0f-f3ff-a2e9-20d791f08d00\\.consul",
-			"Any.*to original-destination"},
+			"public_listener.*192\\.168\\.69\\.179:20000.*INBOUND.*Any.*\\* -> local_app/",
+			"outbound_listener.*127.0.0.1:15001.*OUTBOUND.*10\\.100\\.134\\.173/32, 240\\.0\\.0\\.3/32.*TCP: -> client",
+			"10\\.100\\.31\\.2/32, 240\\.0\\.0\\.5/32.*TCP: -> frontend",
+			"Any.*TCP: -> original-destination"},
 
 		"-routes": {"==> Routes \\(1\\)",
 			"Name.*Destination Cluster.*Last Updated",

cli/cmd/proxy/read/config.go

@@ -303,7 +303,7 @@ func parseListeners(rawCfg map[string]interface{}) ([]Listener, error) {
 
 			filterChain = append(filterChain, FilterChain{
 				FilterChainMatch: strings.Join(filterChainMatch, ", "),
-				Filters:          formatFilters(chain),
+				Filters:          formatFilters(chain.Filters),
 			})
 		}
 
@@ -396,45 +396,156 @@ func parseSecrets(rawCfg map[string]interface{}) ([]Secret, error) {
 	return secrets, nil
 }
 
-func formatFilters(filterChain filterChain) (filters []string) {
+func formatFilters(filters []filter) []string {
+	formatted := []string{}
+
 	// Filters can have many custom configurations, each must be handled differently.
-	formatters := map[string]func(typedConfig) string{
+	// [List of known extensions](https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/listener/v3/listener_components.proto).
+	formatters := map[string]func(filter) string{
+		"type.googleapis.com/envoy.extensions.filters.network.connection_limit.v3.ConnectionLimit":              formatFilterConnectionLimit,
+		"type.googleapis.com/envoy.extensions.filters.network.direct_response.v3.Config":                        formatFilterDirectResponse,
+		"type.googleapis.com/envoy.extensions.filters.network.echo.v3.Echo":                                     formatFilterEcho,
+		"type.googleapis.com/envoy.extensions.filters.network.ext_authz.v3.ExtAuthz":                            formatFilterExtAuthz,
+		"type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager": formatFilterHTTPConnectionManager,
+		"type.googleapis.com/envoy.extensions.filters.network.local_ratelimit.v3.LocalRateLimit":                formatFilterLocalRatelimit,
+		"type.googleapis.com/envoy.extensions.filters.network.ratelimit.v3.RateLimit":                           formatFilterRatelimit,
 		"type.googleapis.com/envoy.extensions.filters.network.rbac.v3.RBAC":                                     formatFilterRBAC,
+		"type.googleapis.com/envoy.extensions.filters.network.sni_cluster.v3.SniCluster":                        formatFilterSniCluster,
 		"type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy":                            formatFilterTCPProxy,
-		"type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager": formatFilterHTTPConnectionManager,
 	}
 
-	for _, chainFilter := range filterChain.Filters {
-		if formatter, ok := formatters[chainFilter.TypedConfig.Type]; ok {
-			filters = append(filters, formatter(chainFilter.TypedConfig))
+	for _, filter := range filters {
+		if formatter, ok := formatters[filter.TypedConfig.Type]; ok {
+			formatted = append(formatted, formatter(filter))
+		} else {
+			formatted = append(formatted, fmt.Sprintf("Unknown filter: %s", filter.TypedConfig.Type))
 		}
 	}
-	return
+	return formatted
 }
 
-func formatFilterTCPProxy(config typedConfig) (filter string) {
-	return "to " + config.Cluster
+func formatFilterConnectionLimit(config filter) string {
+	return fmt.Sprintf("Connection limit: %d max connections with %s delay", config.TypedConfig.MaxConnections, config.TypedConfig.Delay)
 }
 
-func formatFilterRBAC(cfg typedConfig) (filter string) {
-	action := cfg.Rules.Action
-	for _, principal := range cfg.Rules.Policies.ConsulIntentions.Principals {
-		regex := principal.Authenticated.PrincipalName.SafeRegex.Regex
-		filter += fmt.Sprintf("%s %s", action, regex)
+func formatFilterDirectResponse(config filter) string {
+	out := []string{"Direct response: ->"}
+	if file := config.TypedConfig.Response.Filename; file != "" {
+		out = append(out, fmt.Sprintf("file:%s", file))
+	}
+	if inlineBytes := config.TypedConfig.Response.InlineBytes; len(inlineBytes) != 0 {
+		if len(inlineBytes) > 24 {
+			out = append(out, fmt.Sprintf("bytes:%s...", string(inlineBytes)[:24]))
+		} else {
+			out = append(out, fmt.Sprintf("bytes:%s", string(inlineBytes)))
+		}
+	}
+	if inlineString := config.TypedConfig.Response.InlineString; inlineString != "" {
+		if len(inlineString) > 24 {
+			out = append(out, fmt.Sprintf("string:%s...", inlineString[:24]))
+		} else {
+			out = append(out, fmt.Sprintf("string:%s", inlineString))
+		}
+	}
+	if envVar := config.TypedConfig.Response.EnvironmentVariable; envVar != "" {
+		out = append(out, fmt.Sprintf("env:%s", envVar))
+	}
+
+	return strings.Join(out, " ")
+}
+
+func formatFilterEcho(config filter) string {
+	return "Echo: upstream will respond with the data it receives."
+}
+
+func formatFilterExtAuthz(config filter) string {
+	var upstream string
+	if config.TypedConfig.GrpcService.EnvoyGrpc.ClusterName != "" {
+		upstream = config.TypedConfig.GrpcService.EnvoyGrpc.ClusterName
+	} else if config.TypedConfig.GrpcService.GoogleGrpc.TargetUri != "" {
+		upstream = config.TypedConfig.GrpcService.GoogleGrpc.TargetUri
+	} else {
+		upstream = "No upstream configured."
 	}
-	return
+
+	return fmt.Sprintf("External authorization: %s", upstream)
 }
 
-func formatFilterHTTPConnectionManager(cfg typedConfig) (filter string) {
-	for _, host := range cfg.RouteConfig.VirtualHosts {
-		filter += strings.Join(host.Domains, ", ")
-		filter += " to "
+func formatFilterHTTPConnectionManager(config filter) string {
+	out := "HTTP: "
+	for _, host := range config.TypedConfig.RouteConfig.VirtualHosts {
+		out += strings.Join(host.Domains, ", ")
+		out += " -> "
 
 		routes := ""
 		for _, route := range host.Routes {
 			routes += fmt.Sprintf("%s%s", route.Route.Cluster, route.Match.Prefix)
 		}
-		filter += routes
+		out += routes
+	}
+	return out
+}
+
+func formatFilterLocalRatelimit(config filter) string {
+	return fmt.Sprintf("Local rate limit: tokens: max %d per-fill %d, interval: %s",
+		config.TypedConfig.TokenBucket.MaxTokens,
+		config.TypedConfig.TokenBucket.TokensPerFill,
+		config.TypedConfig.TokenBucket.FillInterval)
+}
+
+func formatFilterRatelimit(config filter) string {
+	out := "Rate limit: "
+
+	if config.TypedConfig.Domain != "" {
+		out += config.TypedConfig.Domain + " "
 	}
-	return
+
+	// Rate limit using descriptors.
+	if len(config.TypedConfig.Descriptors) != 0 {
+		for _, descriptor := range config.TypedConfig.Descriptors {
+			for _, entry := range descriptor.Entries {
+				out += fmt.Sprintf("%s:%s ", entry.Key, entry.Value)
+			}
+			out += fmt.Sprintf("%d req per %s", descriptor.Limit.RequestsPerUnit, strings.ToLower(descriptor.Limit.Unit))
+		}
+	}
+
+	// Rate limit using an external Envoy gRPC service.
+	if config.TypedConfig.RateLimitService.GrpcService.EnvoyGrpc.ClusterName != "" {
+		out += fmt.Sprintf("using %s ", config.TypedConfig.RateLimitService.GrpcService.EnvoyGrpc.ClusterName)
+	}
+
+	// Rate limit using an external Google gRPC service.
+	if config.TypedConfig.RateLimitService.GrpcService.GoogleGrpc.TargetUri != "" {
+		out += fmt.Sprintf("using %s ", config.TypedConfig.RateLimitService.GrpcService.GoogleGrpc.TargetUri)
+	}
+
+	// Notify the user that failure to reach the rate limiting service will deny the caller.
+	if config.TypedConfig.FailureModeDeny {
+		out += "will deny if unreachable"
+	}
+
+	return strings.Trim(out, " ")
+}
+
+func formatFilterRBAC(config filter) string {
+	out := "RBAC: "
+	action := config.TypedConfig.Rules.Action
+	for _, principal := range config.TypedConfig.Rules.Policies.ConsulIntentions.Principals {
+		regex := principal.Authenticated.PrincipalName.SafeRegex.Regex
+		out += fmt.Sprintf("%s %s", action, regex)
+	}
+	return out
+}
+
+func formatFilterSniCluster(config filter) string {
+	return "SNI: Upstream cluster name set by SNI field in TLS connection."
+}
+
+func formatFilterTCPProxy(config filter) string {
+	if config.TypedConfig.Cluster == "" {
+		return "TCP: No upstream cluster configured."
+	}
+
+	return "TCP: -> " + strings.Split(config.TypedConfig.Cluster, ".")[0]
 }