diff --git a/contrib/k8sniff/Dockerfile b/contrib/k8sniff/Dockerfile index c6d44a0002..4bbbb1d283 100644 --- a/contrib/k8sniff/Dockerfile +++ b/contrib/k8sniff/Dockerfile @@ -1,19 +1,10 @@ -FROM keppel.eu-de-1.cloud.sap/ccloud-dockerhub-mirror/library/golang:1.16-alpine3.13 +FROM golang:1.22 as builder WORKDIR /go/src/github.com/kubermatic/k8sniff +ADD . . +RUN CGO_ENABLED=0 go build -ldflags '-s' -o /go/bin/k8sniff . -RUN apk add --no-cache curl git \ - && curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh -ARG VERSION=master -RUN git clone https://github.com/kubermatic/k8sniff.git . \ - && git checkout $VERSION - -RUN dep ensure - -RUN go build -v -o k8sniff . - -FROM alpine:3.9 +FROM alpine LABEL source_repository="https://github.com/sapcc/kubernikus" - -RUN apk add --no-cache ca-certificates -COPY --from=0 /go/src/github.com/kubermatic/k8sniff /pipeline/source/k8sniff +COPY --from=builder /go/bin/k8sniff /pipeline/source/k8sniff +CMD ["/pipeline/source/k8sniff"] diff --git a/contrib/k8sniff/LICENSE b/contrib/k8sniff/LICENSE new file mode 100644 index 0000000000..8f63e30d34 --- /dev/null +++ b/contrib/k8sniff/LICENSE @@ -0,0 +1,19 @@ +The MIT License + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the "Software"), +to deal in the Software without restriction, including without limitation +the rights to use, copy, modify, merge, publish, distribute, sublicense, +and/or sell copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/contrib/k8sniff/Makefile b/contrib/k8sniff/Makefile index aa8e92e865..58fb68325c 100644 --- a/contrib/k8sniff/Makefile +++ b/contrib/k8sniff/Makefile @@ -1,7 +1,8 @@ -IMAGE:= sapcc/k8sniff -VERSION := e7435d989925e8559b0e5ca26da69f84a1035c32 +IMAGE:=keppel.eu-de-1.cloud.sap/ccloud/k8sniff +VERSION:=$(shell git rev-parse --verify HEAD) build: - docker build --build-arg VERSION=$(VERSION) -t $(IMAGE):$(VERSION) . + docker build --network=host -t $(IMAGE):$(VERSION) . + push: docker push $(IMAGE):$(VERSION) diff --git a/contrib/k8sniff/README.md b/contrib/k8sniff/README.md new file mode 100644 index 0000000000..5a899dfe9d --- /dev/null +++ b/contrib/k8sniff/README.md @@ -0,0 +1,73 @@ +K8SNIff + +Forked from https://github.com/kubermatic/k8sniff + +K8SNIff - tcp ingress controller with SNI support +===== + +K8SNIff is a small ingress server that will accept incoming TLS connections and parse +TLS Client Hello messages for the SNI Extension. If one is found, we'll go +ahead and forward that connection to a Kubernetes service with a matching Ingress resource. + +sniff config +------------ + +The following config will K8SNIff listen on port `8443` and listen on Ingress resources + +```json +{ + "bind": { + "host": "localhost", + "port": 8443 + }, + "kubernetes": {} +} + +``` +The example ingress connect any requests to `foo` to service `foo` with port `443` and any requests to `bar` to service `bar` with port `443`. If nothing matches this, it will send the traffic to the default backend with the service `bar` on port `443`. + +```yaml +apiVersion: extensions/v1beta1 +kind: Ingress +metadata: + name: tcp + annotations: + kubernetes.io/ingress.class: k8sniff +spec: + backend: + serviceName: bar + servicePort: 443 + rules: + - host: foo + http: + paths: + - backend: + serviceName: foo + servicePort: 443 + - host: bar + http: + paths: + - backend: + serviceName: bar + servicePort: 443 +``` + +The requested domain name are interpreted as regular expressions. Each server and name will be checked in the order they appear in the file, stopping with the first match. If there is no match, then the request is sent to the first server with default `backend` set. + +using the parser +---------------- + +``` +import ( + "fmt" + + " kubermatic/k8sniff/parser" +) + +func main() { + listener, err := net.Listen("tcp", "localhost:2222") + if err != nil { + return err + } +} +``` diff --git a/contrib/k8sniff/config.go b/contrib/k8sniff/config.go new file mode 100644 index 0000000000..baf792b3d1 --- /dev/null +++ b/contrib/k8sniff/config.go @@ -0,0 +1,156 @@ +/* {{{ Copyright (c) Paul R. Tagliamonte , 2015 + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. }}} */ + +package main + +import ( + "encoding/json" + "errors" + "fmt" + "os" + "strings" + "sync" + + "github.com/golang/glog" + + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/cache" +) + +const ( + maxTCPPort = 65535 +) + +type Config struct { + Bind Bind + Metrics Metrics + Servers []Server + Kubernetes *Kubernetes + proxy *Proxy + lock sync.Mutex + + serviceController cache.Controller + serviceStore cache.Store + ingressController cache.Controller + ingressStore cache.Store +} + +// Valid returns an if the config is invalid +func (c *Config) Valid() error { + if len(c.Servers) > 0 && c.Kubernetes != nil { + return errors.New("Cannot set .Servers and .Kubernetes in config file") + } + + if err := c.Metrics.Valid(); err != nil { + return err + } + + return nil +} + +type Kubernetes struct { + Kubeconfig string + Client *kubernetes.Clientset + IngressClass string +} + +// Metrics contains the port & path for the +// prometheus endpoint +type Metrics struct { + Host string + Port int + Path string +} + +type Bind struct { + Host string + Port int +} + +type Server struct { + Default bool + Regexp bool + Host string + Names []string + Port int +} + +// Valid returns an error if the metrics config is invalid +func (m Metrics) Valid() error { + if m.Port > maxTCPPort { + return fmt.Errorf("Configured metrics port is above %d: port=%d", maxTCPPort, m.Port) + } + + return nil +} + +func LoadConfig(path string) (*Config, error) { + glog.V(5).Infof("Loading config from: %s", path) + + fd, err := os.Open(path) + if err != nil { + return nil, err + } + config := Config{} + err = json.NewDecoder(fd).Decode(&config) + if err != nil { + return nil, err + } + + if err = config.Valid(); err != nil { + return nil, err + } + + config.setDefaultsIfUnset() + + glog.V(5).Infof("Read config: %v", config) + + return &config, err +} + +func (c *Config) setDefaultsIfUnset() { + if c.Bind.Port == 0 { + c.Bind.Port = 8443 + } + + if c.Bind.Host == "" { + glog.V(5).Infof("Bind host not set. Using default: 0.0.0.0") + c.Bind.Host = "0.0.0.0" + } + + if c.Metrics.Host == "" { + glog.V(5).Infof("Metrics host not set. Using default: 0.0.0.0") + c.Metrics.Host = c.Bind.Host + } + + if c.Metrics.Port == 0 { + glog.V(5).Infof("Metrics port not set. Using default: 9091") + c.Metrics.Port = 9091 + } + + if c.Metrics.Path == "" { + glog.V(5).Infof("Metrics path not set. Using default: /metrics") + c.Metrics.Path = "/metrics" + } + if !strings.HasPrefix(c.Metrics.Path, "/") { + c.Metrics.Path = "/" + c.Metrics.Path + } + +} diff --git a/contrib/k8sniff/go.mod b/contrib/k8sniff/go.mod new file mode 100644 index 0000000000..efbaaa52a3 --- /dev/null +++ b/contrib/k8sniff/go.mod @@ -0,0 +1,57 @@ +module github.com/sapcc/kubernikus + +go 1.22 + +require ( + github.com/golang/glog v1.2.1 + github.com/kubermatic/k8sniff v0.0.0-20171019092931-e7435d989925 + github.com/prometheus/client_golang v1.19.0 + k8s.io/api v0.29.4 + k8s.io/apimachinery v0.29.4 + k8s.io/client-go v0.29.4 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/go-logr/logr v1.3.0 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.6.0 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/prometheus/client_model v0.5.0 // indirect + github.com/prometheus/common v0.48.0 // indirect + github.com/prometheus/procfs v0.12.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/net v0.23.0 // indirect + golang.org/x/oauth2 v0.16.0 // indirect + golang.org/x/sys v0.18.0 // indirect + golang.org/x/term v0.18.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.33.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.110.1 // indirect + k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 // indirect + k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/contrib/k8sniff/go.sum b/contrib/k8sniff/go.sum new file mode 100644 index 0000000000..b2079083e3 --- /dev/null +++ b/contrib/k8sniff/go.sum @@ -0,0 +1,796 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go 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h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= diff --git a/contrib/k8sniff/kubernetes/example/bar.yaml b/contrib/k8sniff/kubernetes/example/bar.yaml new file mode 100644 index 0000000000..2ed6cd72db --- /dev/null +++ b/contrib/k8sniff/kubernetes/example/bar.yaml @@ -0,0 +1,30 @@ +apiVersion: v1 +kind: Service +metadata: + name: bar +spec: + ports: + - port: 443 + selector: + app: bar +--- +kind: Pod +apiVersion: v1 +metadata: + name: bar + labels: + app: bar +spec: + containers: + - name: porter + image: gcr.io/google_containers/porter:cd5cb5791ebaa8641955f0e8c2a9bed669b1eaab + env: + - name: SERVE_TLS_PORT_443 + value: bar + - name: CERT_FILE + value: "/localhost.crt" + - name: KEY_FILE + value: "/localhost.key" + ports: + - name: https + containerPort: 443 diff --git a/contrib/k8sniff/kubernetes/example/foo.yaml b/contrib/k8sniff/kubernetes/example/foo.yaml new file mode 100644 index 0000000000..0b9da323f8 --- /dev/null +++ b/contrib/k8sniff/kubernetes/example/foo.yaml @@ -0,0 +1,30 @@ +apiVersion: v1 +kind: Service +metadata: + name: foo +spec: + ports: + - port: 443 + selector: + app: foo +--- +kind: Pod +apiVersion: v1 +metadata: + name: foo + labels: + app: foo +spec: + containers: + - name: porter + image: gcr.io/google_containers/porter:cd5cb5791ebaa8641955f0e8c2a9bed669b1eaab + env: + - name: SERVE_TLS_PORT_443 + value: foo + - name: CERT_FILE + value: "/localhost.crt" + - name: KEY_FILE + value: "/localhost.key" + ports: + - name: https + containerPort: 443 diff --git a/contrib/k8sniff/kubernetes/example/k8sniff.json b/contrib/k8sniff/kubernetes/example/k8sniff.json new file mode 100644 index 0000000000..85fab5e336 --- /dev/null +++ b/contrib/k8sniff/kubernetes/example/k8sniff.json @@ -0,0 +1,7 @@ +{ + "bind": { + "host": "localhost", + "port": 8443 + }, + "kubernetes": {} +} diff --git a/contrib/k8sniff/kubernetes/example/tcp-ingress.yaml b/contrib/k8sniff/kubernetes/example/tcp-ingress.yaml new file mode 100644 index 0000000000..71906ec891 --- /dev/null +++ b/contrib/k8sniff/kubernetes/example/tcp-ingress.yaml @@ -0,0 +1,23 @@ +apiVersion: extensions/v1beta1 +kind: Ingress +metadata: + name: tcp + annotations: + kubernetes.io/ingress.class: k8sniff +spec: + backend: + serviceName: bar + servicePort: 443 + rules: + - host: foo + http: + paths: + - backend: + serviceName: foo + servicePort: 443 + - host: bar + http: + paths: + - backend: + serviceName: bar + servicePort: 443 diff --git a/contrib/k8sniff/kubernetes/k8sniff-configmap.yaml b/contrib/k8sniff/kubernetes/k8sniff-configmap.yaml new file mode 100644 index 0000000000..869b907b07 --- /dev/null +++ b/contrib/k8sniff/kubernetes/k8sniff-configmap.yaml @@ -0,0 +1,19 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + name: k8sniff-configmap + namespace: k8sniff +data: + k8sniff.json: | + { + "bind": { + "host": "0.0.0.0", + "port": 8443 + }, + "metrics": { + "host": "0.0.0.0", + "port": 9091, + "path": "/metrics" + }, + "kubernetes": {} + } diff --git a/contrib/k8sniff/kubernetes/k8sniff-deployment.yaml b/contrib/k8sniff/kubernetes/k8sniff-deployment.yaml new file mode 100644 index 0000000000..1104544a02 --- /dev/null +++ b/contrib/k8sniff/kubernetes/k8sniff-deployment.yaml @@ -0,0 +1,37 @@ +apiVersion: extensions/v1beta1 +kind: Deployment +metadata: + name: k8sniff-ingress-lb + namespace: k8sniff + labels: + role: k8sniff-ingress-lb +spec: + replicas: 1 + selector: + matchLabels: + role: k8sniff-ingress-lb + template: + metadata: + labels: + role: k8sniff-ingress-lb + spec: + containers: + - image: kubermatic/k8sniff:latest + name: k8sniff-ingress-lb + imagePullPolicy: Always + command: + - /bin/sh + - -c + - -x + - "/pipeline/source/k8sniff -logtostderr --v=9 --config /etc/config/k8sniff.json" + ports: + - name: https + containerPort: 8443 + volumeMounts: + - name: k8sniff-config + mountPath: /etc/config + readOnly: true + volumes: + - name: k8sniff-config + configMap: + name: k8sniff-configmap diff --git a/contrib/k8sniff/kubernetes/k8sniff-namespace.yaml b/contrib/k8sniff/kubernetes/k8sniff-namespace.yaml new file mode 100644 index 0000000000..d64430a65b --- /dev/null +++ b/contrib/k8sniff/kubernetes/k8sniff-namespace.yaml @@ -0,0 +1,4 @@ +apiVersion: v1 +kind: Namespace +metadata: + name: k8sniff diff --git a/contrib/k8sniff/kubernetes/k8sniff-svc.yaml b/contrib/k8sniff/kubernetes/k8sniff-svc.yaml new file mode 100644 index 0000000000..e8cbde3104 --- /dev/null +++ b/contrib/k8sniff/kubernetes/k8sniff-svc.yaml @@ -0,0 +1,13 @@ +apiVersion: v1 +kind: Service +metadata: + name: k8sniff-ingress-lb + namespace: k8sniff +spec: + type: LoadBalancer + ports: + - port: 443 + targetPort: 8443 + protocol: TCP + selector: + role: k8sniff-ingress-lb diff --git a/contrib/k8sniff/logo/logo.png b/contrib/k8sniff/logo/logo.png new file mode 100644 index 0000000000..658725e0e4 Binary files /dev/null and b/contrib/k8sniff/logo/logo.png differ diff --git a/contrib/k8sniff/main.go b/contrib/k8sniff/main.go new file mode 100644 index 0000000000..d707c21f17 --- /dev/null +++ b/contrib/k8sniff/main.go @@ -0,0 +1,49 @@ +/* {{{ Copyright (c) Paul R. Tagliamonte , 2015 + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. }}} */ + +package main + +import ( + "flag" + "fmt" + + "github.com/kubermatic/k8sniff/metrics" +) + +func main() { + var k8sniffConfig, kubeconfig string + + flag.StringVar(&k8sniffConfig, "config", "k8sniff.json", "Config") + flag.StringVar(&kubeconfig, "kubeconfig", "", "absolute path to the kubeconfig file") + flag.Parse() + + config, err := LoadConfig(k8sniffConfig) + if err != nil { + panic(err) + } + config.Kubernetes.Kubeconfig = kubeconfig + + go metrics.Serve(fmt.Sprintf("%s:%d", config.Metrics.Host, config.Metrics.Port), config.Metrics.Path) + + stop := make(chan struct{}) + defer close(stop) + go panic(config.Serve(stop)) + <-stop +} diff --git a/contrib/k8sniff/metrics/backends.go b/contrib/k8sniff/metrics/backends.go new file mode 100644 index 0000000000..522798ce75 --- /dev/null +++ b/contrib/k8sniff/metrics/backends.go @@ -0,0 +1,18 @@ +package metrics + +import ( + "github.com/prometheus/client_golang/prometheus" +) + +var ( + backendGauge = prometheus.NewGauge( + prometheus.GaugeOpts{ + Name: Prefix + "configured_backends_count", + Help: "Number of configured backends", + }, + ) +) + +func SetBackendCount(count int) { + backendGauge.Set(float64(count)) +} diff --git a/contrib/k8sniff/metrics/connections.go b/contrib/k8sniff/metrics/connections.go new file mode 100644 index 0000000000..5c3b72bb06 --- /dev/null +++ b/contrib/k8sniff/metrics/connections.go @@ -0,0 +1,34 @@ +package metrics + +import ( + "time" + + "github.com/prometheus/client_golang/prometheus" +) + +var ( + connDurationsHisto = prometheus.NewHistogram(prometheus.HistogramOpts{ + Name: Prefix + "connection_durations_histogram_seconds", + Help: "Connection duration distributions.", + }) + connGauge = prometheus.NewGauge( + prometheus.GaugeOpts{ + Name: Prefix + "opened_connections_count", + Help: "Number of opened TCP connections", + }, + ) +) + +// IncConnections increments the total connections counter +func IncConnections() { + connGauge.Inc() +} + +func DecConnections() { + connGauge.Dec() +} + +// ConnectionTime gather the duration of a connection +func ConnectionTime(d time.Duration) { + connDurationsHisto.Observe(d.Seconds()) +} diff --git a/contrib/k8sniff/metrics/doc.go b/contrib/k8sniff/metrics/doc.go new file mode 100644 index 0000000000..e5d5019bb1 --- /dev/null +++ b/contrib/k8sniff/metrics/doc.go @@ -0,0 +1,3 @@ +// Package metrics contains some metrics that could be +// collected by Prometheus. +package metrics diff --git a/contrib/k8sniff/metrics/errors.go b/contrib/k8sniff/metrics/errors.go new file mode 100644 index 0000000000..2869926657 --- /dev/null +++ b/contrib/k8sniff/metrics/errors.go @@ -0,0 +1,26 @@ +package metrics + +import ( + "github.com/prometheus/client_golang/prometheus" +) + +const ( + Error = "error" + Fatal = "fatal" + Info = "info" +) + +var ( + errorCounterVec = prometheus.NewCounterVec( + prometheus.CounterOpts{ + Name: Prefix + "errors_total", + Help: "Total error count", + }, + []string{"type"}, + ) +) + +// IncErrors increments the total errors counter +func IncErrors(typ string) { + errorCounterVec.WithLabelValues(typ).Inc() +} diff --git a/contrib/k8sniff/metrics/init.go b/contrib/k8sniff/metrics/init.go new file mode 100644 index 0000000000..2e9d0e4644 --- /dev/null +++ b/contrib/k8sniff/metrics/init.go @@ -0,0 +1,14 @@ +package metrics + +import "github.com/prometheus/client_golang/prometheus" + +const ( + Prefix = "k8sniff_" +) + +func init() { + prometheus.MustRegister(connDurationsHisto) + prometheus.MustRegister(connGauge) + prometheus.MustRegister(errorCounterVec) + prometheus.MustRegister(backendGauge) +} diff --git a/contrib/k8sniff/metrics/serve.go b/contrib/k8sniff/metrics/serve.go new file mode 100644 index 0000000000..eee0ea243d --- /dev/null +++ b/contrib/k8sniff/metrics/serve.go @@ -0,0 +1,17 @@ +package metrics + +import ( + "log" + "net/http" + + "github.com/golang/glog" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +// Serve the prometheus metrics endpoint +func Serve(addr, path string) { + glog.V(1).Infof("Metrics exposed on %s%s", addr, path) + + http.Handle(path, promhttp.Handler()) + log.Fatal(http.ListenAndServe(addr, nil)) +} diff --git a/contrib/k8sniff/parser/parser.go b/contrib/k8sniff/parser/parser.go new file mode 100644 index 0000000000..edc75ef446 --- /dev/null +++ b/contrib/k8sniff/parser/parser.go @@ -0,0 +1,144 @@ +/* {{{ Copyright 2017 Paul Tagliamonte + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. }}} */ + +package parser + +import ( + "fmt" +) + +var TLSHeaderLength = 5 + +/* This function is basically all most folks want to invoke out of this + * jumble of bits. This will take an incoming TLS Client Hello (including + * all the fuzzy bits at the beginning of it - fresh out of the socket) and + * go ahead and give us the SNI Name they want. */ +func GetHostname(data []byte) (string, error) { + if len(data) == 0 || data[0] != 0x16 { + return "", fmt.Errorf("Doesn't look like a TLS Client Hello") + } + + extensions, err := GetExtensionBlock(data) + if err != nil { + return "", err + } + sn, err := GetSNBlock(extensions) + if err != nil { + return "", err + } + sni, err := GetSNIBlock(sn) + if err != nil { + return "", err + } + return string(sni), nil +} + +/* Given a Server Name TLS Extension block, parse out and return the SNI + * (Server Name Indication) payload */ +func GetSNIBlock(data []byte) ([]byte, error) { + index := 0 + + for { + if index >= len(data) { + break + } + length := int((data[index] << 8) + data[index+1]) + endIndex := index + 2 + length + if data[index+2] == 0x00 { /* SNI */ + sni := data[index+3:] + sniLength := int((sni[0] << 8) + sni[1]) + return sni[2 : sniLength+2], nil + } + index = endIndex + } + return []byte{}, fmt.Errorf( + "Finished parsing the SN block without finding an SNI", + ) +} + +/* Given a TLS Extensions data block, go ahead and find the SN block */ +func GetSNBlock(data []byte) ([]byte, error) { + index := 0 + + if len(data) < 2 { + return []byte{}, fmt.Errorf("Not enough bytes to be an SN block") + } + + extensionLength := int((data[index] << 8) + data[index+1]) + if extensionLength+2 > len(data) { + return []byte{}, fmt.Errorf("Extension looks bonkers") + } + data = data[2 : extensionLength+2] + + for { + if index+3 >= len(data) { + break + } + length := int((data[index+2] << 8) + data[index+3]) + endIndex := index + 4 + length + if data[index] == 0x00 && data[index+1] == 0x00 { + return data[index+4 : endIndex], nil + } + + index = endIndex + } + + return []byte{}, fmt.Errorf( + "Finished parsing the Extension block without finding an SN block", + ) +} + +/* Given a raw TLS Client Hello, go ahead and find all the Extensions */ +func GetExtensionBlock(data []byte) ([]byte, error) { + /* data[0] - content type + * data[1], data[2] - major/minor version + * data[3], data[4] - total length + * data[...38+5] - start of SessionID (length bit) + * data[38+5] - length of SessionID + */ + var index = TLSHeaderLength + 38 + + if len(data) <= index+1 { + return []byte{}, fmt.Errorf("Not enough bits to be a Client Hello") + } + + /* Index is at SessionID Length bit */ + if newIndex := index + 1 + int(data[index]); (newIndex + 2) < len(data) { + index = newIndex + } else { + return []byte{}, fmt.Errorf("Not enough bytes for the SessionID") + } + + /* Index is at Cipher List Length bits */ + if newIndex := (index + 2 + int((data[index]<<8)+data[index+1])); (newIndex + 1) < len(data) { + index = newIndex + } else { + return []byte{}, fmt.Errorf("Not enough bytes for the Cipher List") + } + + /* Index is now at the compression length bit */ + if newIndex := index + 1 + int(data[index]); newIndex < len(data) { + index = newIndex + } else { + return []byte{}, fmt.Errorf("Not enough bytes for the compression length") + } + + /* Now we're at the Extension start */ + if len(data[index:]) == 0 { + return nil, fmt.Errorf("No extensions") + } + return data[index:], nil +} + +// vim: foldmethod=marker diff --git a/contrib/k8sniff/server.go b/contrib/k8sniff/server.go new file mode 100644 index 0000000000..4100938fce --- /dev/null +++ b/contrib/k8sniff/server.go @@ -0,0 +1,443 @@ +/* {{{ Copyright (c) Paul R. Tagliamonte , 2015 + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. }}} */ + +package main + +import ( + "context" + "fmt" + "io" + "math/rand" + "net" + "reflect" + "regexp" + "strings" + "sync" + "time" + + "github.com/golang/glog" + "github.com/kubermatic/k8sniff/metrics" + "github.com/kubermatic/k8sniff/parser" + + v1 "k8s.io/api/core/v1" + netv1 "k8s.io/api/networking/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/util/wait" + "k8s.io/apimachinery/pkg/watch" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/cache" + "k8s.io/client-go/tools/clientcmd" +) + +const ( + // ingressClassKey picks a specific "class" for the Ingress. The controller + // only processes Ingresses with this annotation either unset, or set + // to either nginxIngressClass or the empty string. + ingressClassKey = "kubernetes.io/ingress.class" + + ConnectionClosedErr = "use of closed network connection" + ConnectionResetErr = "connection reset by peer" +) + +// now provides func() time.Time +// so it is easier to mock, if wou want to add tests +var now = time.Now + +type ServerAndRegexp struct { + Server *Server + Regexp *regexp.Regexp +} + +type Proxy struct { + Lock sync.RWMutex + ServerList []ServerAndRegexp + Default *Server +} + +func (p *Proxy) Get(host string) *Server { + p.Lock.RLock() + defer p.Lock.RUnlock() + + for _, tuple := range p.ServerList { + if tuple.Regexp.MatchString(host) { + return tuple.Server + } + } + return p.Default +} + +func (p *Proxy) Update(c *Config) error { + servers := []ServerAndRegexp{} + currentServers := c.Servers + for i, server := range currentServers { + for _, hostname := range server.Names { + var hostRegexp *regexp.Regexp + var err error + if server.Regexp { + hostRegexp, err = regexp.Compile(hostname) + } else { + hostRegexp, err = regexp.Compile("^" + regexp.QuoteMeta(hostname) + "$") + } + if err != nil { + return fmt.Errorf("cannot update proxy due to invalid regex: %v", err) + } + tuple := ServerAndRegexp{¤tServers[i], hostRegexp} + servers = append(servers, tuple) + } + } + var def *Server + for i, server := range currentServers { + if server.Default { + def = ¤tServers[i] + break + } + } + + p.Lock.Lock() + defer p.Lock.Unlock() + p.ServerList = servers + p.Default = def + + return nil +} + +func (c *Config) UpdateServers() error { + class := c.Kubernetes.IngressClass + if class == "" { + class = "k8sniff" + } + + serverForBackend := func(ing *netv1.Ingress, backend *netv1.IngressBackend) (*Server, error) { + obj, found, err := c.serviceStore.GetByKey(fmt.Sprintf("%s/%s", ing.Namespace, backend.Service.Name)) + if err != nil { + return nil, err + } + if !found { + return nil, fmt.Errorf("service %s/%s not found", ing.Namespace, backend.Service.Name) + } + svc := obj.(*v1.Service) + port := int(backend.Service.Port.Number) + return &Server{ + Host: svc.Spec.ClusterIP, + Port: port, + }, nil + } + + servers := []Server{} + ingressList := c.ingressStore.List() + for _, i := range ingressList { + i := i.(*netv1.Ingress) + name := fmt.Sprintf("%s/%s", i.Namespace, i.Name) + if i.Annotations[ingressClassKey] != class { + glog.V(6).Infof("Skipping ingress %s due to missing annotation. Expected %s=%s Got %s=%s", name, ingressClassKey, class, ingressClassKey, i.Annotations[ingressClassKey]) + continue + } + + if i.Spec.DefaultBackend != nil { + s, err := serverForBackend(i, i.Spec.DefaultBackend) + if err != nil { + metrics.IncErrors(metrics.Error) + glog.V(0).Infof("Ingress %s error with default backend, skipping: %v", name, err) + } else { + s.Default = true + servers = append(servers, *s) + } + } + for _, r := range i.Spec.Rules { + if r.HTTP == nil { + metrics.IncErrors(metrics.Error) + glog.V(0).Infof("Ingress %s error with rule, skipping: http must be set", name) + continue + } + for _, p := range r.HTTP.Paths { + if p.Path != "" && p.Path != "/" { + metrics.IncErrors(metrics.Error) + glog.V(0).Infof("Ingress %s error with rule, skipping: path is not empty", name) + continue + } + s, err := serverForBackend(i, &p.Backend) + if err != nil { + metrics.IncErrors(metrics.Error) + glog.V(0).Infof("Ingress %s error with rule %q path %q, skipping: %v", name, r.Host, p.Path, err) + continue + } + s.Names = []string{r.Host} + glog.V(6).Infof("Adding backend %q -> %s:%d", r.Host, s.Host, s.Port) + servers = append(servers, *s) + } + } + } + c.lock.Lock() + defer c.lock.Unlock() + if !reflect.DeepEqual(c.Servers, servers) { + c.Servers = servers + glog.V(2).Infof("Updating proxy configuration") + err := c.proxy.Update(c) + if err != nil { + time.Sleep(time.Second) + return fmt.Errorf("failed to update proxy: %v", err) + } + glog.V(2).Infof("================================================") + glog.V(2).Infof("Updated servers. New servers:") + c.PrintCurrentServers(2) + glog.V(2).Infof("================================================") + } + + metrics.SetBackendCount(len(c.Servers) - 1) + + return nil +} + +func (c *Config) PrintCurrentServers(logLevel glog.Level) { + for _, s := range c.Servers { + hostnames := strings.Join(s.Names, ",") + if hostnames == "" { + hostnames = "default backend" + } + glog.V(logLevel).Infof("%s -> %s", hostnames, s.Host) + } +} + +func (c *Config) Debug() { + glog.V(4).Info("================================================") + glog.V(4).Info("Current configured servers:") + c.PrintCurrentServers(4) + glog.V(4).Info("================================================") +} + +func (c *Config) TriggerUpdate() { + if !c.ControllersHaveSynced() { + return + } + err := c.UpdateServers() + if err != nil { + metrics.IncErrors(metrics.Info) + glog.V(0).Infof("failed to update servers list: %v", err) + } +} + +func (c *Config) ControllersHaveSynced() bool { + return c.ingressController.HasSynced() && c.serviceController.HasSynced() +} + +func (c *Config) Serve(stopCh chan struct{}) error { + glog.V(0).Infof("Listening on %s:%d", c.Bind.Host, c.Bind.Port) + listener, err := net.Listen("tcp", fmt.Sprintf( + "%s:%d", c.Bind.Host, c.Bind.Port, + )) + if err != nil { + metrics.IncErrors(metrics.Fatal) + return err + } + + c.proxy = &Proxy{} + err = c.proxy.Update(c) + if err != nil { + metrics.IncErrors(metrics.Fatal) + return err + } + + if c.Kubernetes != nil { + cfg, err := clientcmd.BuildConfigFromFlags("", c.Kubernetes.Kubeconfig) + if err != nil { + panic(err) + } + c.Kubernetes.Client = kubernetes.NewForConfigOrDie(cfg) + c.ingressStore, c.ingressController = cache.NewInformer( + &cache.ListWatch{ + ListFunc: func(options metav1.ListOptions) (runtime.Object, error) { + return c.Kubernetes.Client.NetworkingV1().Ingresses("").List(context.TODO(), options) + }, + WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) { + return c.Kubernetes.Client.NetworkingV1().Ingresses("").Watch(context.TODO(), options) + }, + }, + &netv1.Ingress{}, + 30*time.Minute, + cache.ResourceEventHandlerFuncs{ + AddFunc: func(obj interface{}) { + go c.TriggerUpdate() + }, + UpdateFunc: func(old, cur interface{}) { + go c.TriggerUpdate() + }, + DeleteFunc: func(obj interface{}) { + go c.TriggerUpdate() + }, + }, + ) + + c.serviceStore, c.serviceController = cache.NewInformer( + &cache.ListWatch{ + ListFunc: func(options metav1.ListOptions) (runtime.Object, error) { + return c.Kubernetes.Client.CoreV1().Services("").List(context.TODO(), options) + }, + WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) { + return c.Kubernetes.Client.CoreV1().Services("").Watch(context.TODO(), options) + }, + }, + &v1.Service{}, + 30*time.Minute, + cache.ResourceEventHandlerFuncs{ + AddFunc: func(obj interface{}) { + go c.TriggerUpdate() + }, + UpdateFunc: func(old, cur interface{}) { + go c.TriggerUpdate() + }, + DeleteFunc: func(obj interface{}) { + go c.TriggerUpdate() + }, + }, + ) + + go c.serviceController.Run(stopCh) + go c.ingressController.Run(stopCh) + } + c.TriggerUpdate() + + go wait.Forever(func() { + c.Debug() + }, 30*time.Second) + + for { + conn, err := listener.Accept() + if err != nil { + metrics.IncErrors(metrics.Error) + return err + } + + connectionID := RandomString(8) + glog.V(4).Infof( + "[%s] Proxy: %s -> %s", + connectionID, + conn.RemoteAddr(), + conn.LocalAddr(), + ) + go c.proxy.Handle(conn, connectionID) + } +} + +func (p *Proxy) Handle(conn net.Conn, connectionID string) { + metrics.IncConnections() + start := now() + defer func(s time.Time) { + err := conn.Close() + if err != nil { + glog.V(0).Infof("[%s] Failed closing connection: %v", connectionID, err) + metrics.IncErrors(metrics.Error) + } + metrics.DecConnections() + metrics.ConnectionTime(now().Sub(s)) + }(start) + data := make([]byte, 4096) + + length, err := conn.Read(data) + if err != nil { + metrics.IncErrors(metrics.Error) + glog.V(4).Infof("[%s] Error reading the first 4k of the connection: %v", connectionID, err) + return + } + + var proxy *Server + hostname, hostnameErr := parser.GetHostname(data[:]) + if hostnameErr == nil { + glog.V(6).Infof("[%s] Parsed hostname: %s", connectionID, hostname) + + proxy = p.Get(hostname) + if proxy == nil { + glog.V(4).Infof("[%s] No proxy matched %s", connectionID, hostname) + return + } else { + glog.V(4).Infof("[%s] Host found %s", connectionID, proxy.Host) + } + } else { + glog.V(6).Infof("[%s] Parsed request without hostname", connectionID) + + proxy = p.Default + if proxy == nil { + glog.V(4).Infof("[%s] No default proxy", connectionID) + return + } + } + + clientConn, err := net.Dial("tcp", fmt.Sprintf( + "%s:%d", proxy.Host, proxy.Port, + )) + if err != nil { + metrics.IncErrors(metrics.Error) + glog.V(0).Infof("[%s] Error connecting to backend: %v", connectionID, err) + return + } + + defer func() { + err := clientConn.Close() + if err != nil { + glog.V(0).Infof("[%s] Failed closing client connection: %v", connectionID, err) + metrics.IncErrors(metrics.Error) + } + }() + + n, err := clientConn.Write(data[:length]) + glog.V(7).Infof("[%s] Wrote %d bytes", connectionID, n) + if err != nil { + metrics.IncErrors(metrics.Info) + glog.V(7).Infof("[%s] Error sending data to backend: %v", connectionID, err) + return + } + Copycat(clientConn, conn, connectionID) +} + +func Copycat(client, server net.Conn, connectionID string) { + glog.V(6).Infof("[%s] Initiating copy between %s and %s", connectionID, client.RemoteAddr().String(), server.RemoteAddr().String()) + + doCopy := func(s, c net.Conn, cancel chan<- bool) { + glog.V(7).Infof("[%s] Established connection %s -> %s", connectionID, s.RemoteAddr().String(), c.RemoteAddr().String()) + _, err := io.Copy(s, c) + if err != nil && !strings.Contains(err.Error(), ConnectionClosedErr) && !strings.Contains(err.Error(), ConnectionResetErr) { + glog.V(0).Infof("[%s] Failed copying connection data: %v", connectionID, err) + metrics.IncErrors(metrics.Error) + } + glog.V(7).Infof("[%s] Destroyed connection %s -> %s", connectionID, s.RemoteAddr().String(), c.RemoteAddr().String()) + cancel <- true + } + + cancel := make(chan bool, 2) + + go doCopy(server, client, cancel) + go doCopy(client, server, cancel) + + select { + case <-cancel: + glog.V(6).Infof("[%s] Disconnected", connectionID) + return + } +} + +func RandomString(strlen int) string { + rand.Seed(time.Now().UTC().UnixNano()) + const chars = "abcdefghijklmnopqrstuvwxyz0123456789" + result := make([]byte, strlen) + for i := 0; i < strlen; i++ { + result[i] = chars[rand.Intn(len(chars))] + } + return string(result) +}