From 5d0a0dc793f21cd084f931d1df514538a83dd97e Mon Sep 17 00:00:00 2001 From: Sara Kalupa Date: Tue, 2 Jan 2024 15:24:08 -0600 Subject: [PATCH] Optional Kafka Producer Adds in a toggleable feature to send logs via configurable Kafka Producer --- build/docker-compose.yaml | 2 +- build/go/frontend/Dockerfile | 14 +- configs/go/frontend/frontend.yaml | 7 + docs/README.md | 18 +++ go.mod | 3 + go.sum | 205 ++++++++++++++++++++++++++++ src/go/cmd/strelka-frontend/main.go | 81 ++++++++++- src/go/pkg/rpc/rpc.go | 13 ++ src/go/pkg/structs/structs.go | 10 ++ 9 files changed, 342 insertions(+), 11 deletions(-) diff --git a/build/docker-compose.yaml b/build/docker-compose.yaml index 6f74df53..5ca19df4 100644 --- a/build/docker-compose.yaml +++ b/build/docker-compose.yaml @@ -11,7 +11,7 @@ services: build: context: .. dockerfile: build/go/frontend/Dockerfile - command: strelka-frontend + command: strelka-frontend -locallog=true -kafkalog=false ports: - 57314:57314 # must match the port in frontend.yaml networks: diff --git a/build/go/frontend/Dockerfile b/build/go/frontend/Dockerfile index 5ad969d9..8ad7dea2 100644 --- a/build/go/frontend/Dockerfile +++ b/build/go/frontend/Dockerfile @@ -1,9 +1,11 @@ # Strelka Frontend # The frontend for a cluster in which clients can connect directly via Envoy. # For more information, please see: https://target.github.io/strelka/#/?id=strelka-frontend -FROM golang:1.17.6 AS build +FROM golang:1.17.6-alpine AS build LABEL maintainer="Target Brands, Inc. TTS-CFC-OpenSource@target.com" +RUN apk add openssl-dev bash build-base pkgconfig librdkafka librdkafka-dev + # Copy source files and set the working directory COPY ./src/go/ /go/src/github.com/target/strelka/src/go/ WORKDIR /go/src/github.com/target/strelka/src/go/ @@ -11,23 +13,23 @@ COPY go.* /go/src/github.com/target/strelka/ # Statically compile and output to tmp RUN go mod download && \ - CGO_ENABLED=0 go build -o /tmp/strelka-frontend cmd/strelka-frontend/main.go + CGO_ENABLED=1 go build -tags musl -o /tmp/strelka-frontend cmd/strelka-frontend/main.go # Initialize runtime container FROM alpine LABEL maintainer="Target Brands, Inc. TTS-CFC-OpenSource@target.com" +RUN apk add librdkafka + # Copy binary COPY --from=build /tmp/strelka-frontend /usr/local/bin/strelka-frontend +COPY --from=build /usr/local/lib/ /usr/local/lib/ # Create logging directory RUN mkdir /var/log/strelka/ && \ chgrp -R 0 /var/log/strelka/ && \ chmod -R g=u /var/log/strelka/ -# Initialize with non-root user -USER 1001 - # Set container entrypoint. This could be set/overridden elsewhere in deployment (e.g. k8s, docker-compose, etc.) # Currently overwritten in ./build/docker-compose.yml -ENTRYPOINT ["strelka-frontend"] +ENTRYPOINT ["strelka-frontend", "-locallog=true", "-kafkalog=false"] diff --git a/configs/go/frontend/frontend.yaml b/configs/go/frontend/frontend.yaml index d40125a6..9e338eaf 100644 --- a/configs/go/frontend/frontend.yaml +++ b/configs/go/frontend/frontend.yaml @@ -13,3 +13,10 @@ gatekeeper: ttl: 1h response: log: "/var/log/strelka/strelka.log" +broker: + bootstrap: "full broker here" + protocol: "protocol here" + certlocation: "path to cert location" + keylocation: "path to key location" + calocation: "path to target ca bundle" + topic: "topic name here" diff --git a/docs/README.md b/docs/README.md index fe37b5fd..38739a01 100644 --- a/docs/README.md +++ b/docs/README.md @@ -473,6 +473,12 @@ For the options below, only one response setting may be configured. * "gatekeeper.ttl": time-to-live for events added to the gatekeeper (defaults to 1 hour) * "response.log": location where worker scan results are logged to (defaults to /var/log/strelka/strelka.log) * "response.report": frequency at which the frontend reports the number of files processed (no default) +* "broker.bootstrap": Full name of kafka topic to produce to (Optional) +* "broker.protocol": Authentication protocol that Kafka will attempt to use to connect to Kafka Topic e.g SSL (Optional) +* "broker.certlocation": File Path to certificate file to be used to authenticate to Kafka Topic (Optional) +* "broker.keylocation": File Path to key file to be used to authenticate to Kafka Topic (Optional) +* "broker.calocation": File Path to CA Certificate bundle to be used to authenticate to Kafka Topic (Optional) +* "broker.topic": Full topic name of the Kafka Topic to connect to (Optional) #### manager * "coordinator.addr": network address of the coordinator (defaults to strelka_coordinator_1:6379) @@ -732,6 +738,18 @@ Navigate to the Jaeger UI at http://localhost:16686/ to view traces. ![jaeger trace view](images/strelka-traces-008.jpg?raw=true) +## Logging + +### Local +The historical, and default, means of logging in Strelka is via a local log file that is instatiated upon the creation of the Strelka Frontend container. While other logging methodologies have recently been added (see Kafka section), in cases where other optional logging methodologies have been enable but fail some time after the instance has started running, the instance will always default to the local log such that no data is lost in the event of the alternative logging methodology failing. + +### Kafka +The Frontend allows for the creation of a Kafka producer at runtime for an alternative means of logging Strelka output such that logs can be streamed to a Kafka Topic of the user's choice. This logging option is useful when there is a high volume of data being processed by Strelka and the production of that data to a down stream analysis tool (such as a SIEM system) must be highly availible for data enrichment purposes. + +Currently this is toggled on and off in the Frontend Dockerfile, which is overwritten in the build/docker-compose.yaml file. Specifically, to toggle the Kafka Producer log option on, the locallog command line option must be set to false, and the kafkalog function must be set to true. If both command line options are set to true, then the Frontend will default to the local logging option, which is how the logging has functioned historically. + +The Kafka Producer that is created with the abbove command line options is fully configurable, and placeholder fields have already been added to the frontend.yaml configuration file. This file will need to be updated in order to point to an existing Kafka Topic, as desired. In cases where some fields are not used (e.g when security has not been enable on the desired Kafka Topic, etc) then unused fields in the broker configuration section of the frontend.yaml file may simply be replaced with an empty string. + ## Scanners Each scanner parses files of a specific flavor and performs data collection and/or file extraction on them. Scanners are typically named after the type of file they are intended to scan (e.g. "ScanHtml", "ScanPe", "ScanRar") but may also be named after the type of function or tool they use to perform their tasks (e.g. "ScanExiftool", "ScanHeader", "ScanOcr"). diff --git a/go.mod b/go.mod index 7593cfa1..0eb356ec 100644 --- a/go.mod +++ b/go.mod @@ -11,8 +11,11 @@ require ( gopkg.in/yaml.v2 v2.4.0 ) +require gopkg.in/confluentinc/confluent-kafka-go.v1 v1.8.2 // indirect + require ( github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/confluentinc/confluent-kafka-go v1.9.2 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect golang.org/x/net v0.17.0 // indirect golang.org/x/sys v0.13.0 // indirect diff --git a/go.sum b/go.sum index 9ce8f07d..a1fcae36 100644 --- a/go.sum +++ b/go.sum @@ -1,45 +1,250 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod 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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/src/go/cmd/strelka-frontend/main.go b/src/go/cmd/strelka-frontend/main.go index bd7837b1..c13cf0cf 100644 --- a/src/go/cmd/strelka-frontend/main.go +++ b/src/go/cmd/strelka-frontend/main.go @@ -22,6 +22,8 @@ import ( "github.com/target/strelka/src/go/api/strelka" "github.com/target/strelka/src/go/pkg/rpc" "github.com/target/strelka/src/go/pkg/structs" + + "github.com/confluentinc/confluent-kafka-go/kafka" ) type coord struct { @@ -248,6 +250,17 @@ func main() { "/etc/strelka/frontend.yaml", "path to frontend config", ) + locallog := flag.Bool( + "locallog", + true, + "Boolean to use base local logging for Strelka, defaults to True", + ) + + kafkalog := flag.Bool( + "kafkalog", + false, + "Boolean use Kafka logging, locallog must be false for function to work. Defaults to False", + ) flag.Parse() confData, err := ioutil.ReadFile(*confPath) @@ -269,10 +282,70 @@ func main() { responses := make(chan *strelka.ScanResponse, 100) defer close(responses) if conf.Response.Log != "" { - go func() { - rpc.LogResponses(responses, conf.Response.Log) - }() - log.Printf("responses will be logged to %v", conf.Response.Log) + if *locallog { + go func() { + rpc.LogResponses(responses, conf.Response.Log) + }() + log.Printf("responses will be logged to %v", conf.Response.Log) + } + if !*locallog && *kafkalog { + log.Printf("Creating new Kafka producer.") + p, err := kafka.NewProducer(&kafka.ConfigMap{ + "bootstrap.servers": conf.Broker.Bootstrap, + "security.protocol": conf.Broker.Protocol, + "ssl.certificate.location": conf.Broker.Certlocation, + "ssl.key.location": conf.Broker.Keylocation, + "ssl.ca.location": conf.Broker.Calocation, + }) + if err != nil { + log.Fatalf("FAILED TO CREATE KAFKA PRODUCER: ERROR %v", err) + } + + log.Printf("Producer is created, waiting for logs.") + + go func() { + for e := range p.Events() { + switch ev := e.(type) { + case *kafka.Message: + if ev.TopicPartition.Error != nil { + log.Printf("Delivery failed to Kafka topic: %v\n", ev.TopicPartition) + var rawEvent = ev.Value + + //Fail safe for if Kafka delivery production fails, will prevent indefinite streaming to local log + rpc.LogIndividualResponse(string(rawEvent), conf.Response.Log) + } else { + log.Printf("Delivered message to %v\n", ev.TopicPartition) + } + } + } + }() + + // Produce to Kafka from logs + go func() { + // Produce messages to topic (asynchronously) + topic := conf.Broker.Topic + for r := range responses { + rawIn := json.RawMessage(r.Event) + bytes, err := rawIn.MarshalJSON() + + if err != nil { + log.Fatalf("Unable to marshal byte encoded event, check error message for more details: %v", err) + } + + if err != nil { + log.Printf("ERROR %s", err.Error()) + return + } + p.Produce(&kafka.Message{ + TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: -1}, + Value: bytes, + Headers: []kafka.Header{ + {Key: "@timestamp", Value: []byte(time.Now().Format("2006-01-02T15:04:05-0700"))}, + }, + }, nil) + } + }() + } } else if conf.Response.Report != 0 { go func() { rpc.ReportResponses(responses, conf.Response.Report) diff --git a/src/go/pkg/rpc/rpc.go b/src/go/pkg/rpc/rpc.go index 9ae2fa08..bbc547c2 100644 --- a/src/go/pkg/rpc/rpc.go +++ b/src/go/pkg/rpc/rpc.go @@ -106,6 +106,19 @@ func LogResponses(responses <-chan *strelka.ScanResponse, path string) { } } +// Logs String for individual responses +func LogIndividualResponse(individualLog string, path string) { + f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) + if err != nil { + log.Fatalf("failed to create file %s: %v", path, err) + } + defer f.Close() + + nl := osNewline() + f.WriteString(fmt.Sprintf("%s%s", individualLog, nl)) + +} + // Logs events in responses to stdout func PrintResponses(responses <-chan *strelka.ScanResponse) { nl := osNewline() diff --git a/src/go/pkg/structs/structs.go b/src/go/pkg/structs/structs.go index bf721595..8f37fc2c 100644 --- a/src/go/pkg/structs/structs.go +++ b/src/go/pkg/structs/structs.go @@ -47,6 +47,15 @@ type ConfCoordinator struct { BlockingPopTime time.Duration // optional, defaults to 0/non-blocking (polling). } +type ConfKafka struct { + Bootstrap string //required + Protocol string //required + Certlocation string //required + Keylocation string //required + Calocation string //required + Topic string //required +} + type ConfGatekeeper struct { Addr string // required DB int // required @@ -86,6 +95,7 @@ type Frontend struct { Coordinator ConfCoordinator // required Gatekeeper ConfGatekeeper // required Response ConfResponse // optional + Broker ConfKafka //required } type Manager struct {