Initial commit

Author: ansd

.gitignore

@@ -0,0 +1 @@
+default-user-credential-updater

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.17 as builder
+
+WORKDIR /go/src/app
+ADD . /go/src/app
+
+RUN go get -d -v ./...
+
+ENV CGO_ENABLED=0
+RUN go build -o /go/bin/app
+
+FROM scratch
+COPY --from=builder /go/bin/app /default-user-credential-updater
+ENTRYPOINT ["/default-user-credential-updater"]

LICENSE

@@ -0,0 +1,23 @@
+module github.com/rabbitmq/default-user-credential-updater
+
+go 1.17
+
+require (
+	github.com/fsnotify/fsnotify v1.5.1
+	github.com/go-logr/logr v1.0.0
+	github.com/michaelklishin/rabbit-hole/v2 v2.10.0
+	github.com/onsi/ginkgo v1.16.4
+	github.com/onsi/gomega v1.16.0
+	gopkg.in/ini.v1 v1.63.0
+	k8s.io/klog/v2 v2.20.0
+)
+
+require (
+	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/smartystreets/goconvey v1.6.4 // indirect
+	golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
+	golang.org/x/text v0.3.6 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

go.mod

@@ -0,0 +1,123 @@
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+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+k8s.io/klog/v2 v2.20.0 h1:tlyxlSvd63k7axjhuchckaRJm+a92z5GSOrTOQY5sHw=
+k8s.io/klog/v2 v2.20.0/go.mod h1:Gm8eSIfQN6457haJuPaMxZw4wyP5k+ykPFlrhQDvhvw=

go.sum

@@ -0,0 +1,153 @@
+package main
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"flag"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"k8s.io/klog/v2"
+	"k8s.io/klog/v2/klogr"
+
+	"github.com/fsnotify/fsnotify"
+	"github.com/go-logr/logr"
+	rabbithole "github.com/michaelklishin/rabbit-hole/v2"
+	"github.com/rabbitmq/default-user-credential-updater/updater"
+	"gopkg.in/ini.v1"
+)
+
+func main() {
+	var managementURI, caFile string
+	u := &updater.PasswordUpdater{}
+
+	flag.StringVar(
+		&u.DefaultUserFile,
+		"default-user-file",
+		"/etc/rabbitmq/conf.d/11-default_user.conf",
+		"Absolute path to file containing default user username and (updated) password. "+
+			"Its directory will be watched for changes.")
+	flag.StringVar(
+		&u.AdminFile,
+		"admin-file",
+		"/var/lib/rabbitmq/.rabbitmqadmin.conf",
+		"Absolute path to file used by rabbitmqadmin CLI. "+
+			"It contains RabbitMQ admin username (must be the same as default user username) and (old) password.")
+	flag.StringVar(
+		&managementURI,
+		"management-uri",
+		"http://127.0.0.1:15672",
+		"RabbitMQ Management URI")
+	flag.StringVar(
+		&caFile,
+		"ca-file",
+		"/etc/rabbitmq-tls/ca.crt",
+		"This file contains the trusted certificate for RabbitMQ server authentication.")
+	klog.InitFlags(nil)
+	flag.Parse()
+	log := klogr.New().WithName("password-updater")
+	u.Log = log
+
+	rabbitClient, err := newRabbitClient(log, managementURI, caFile)
+	if err != nil {
+		log.Error(err, "failed to create RabbitMQ client")
+		return
+	}
+	u.Rmqc = rabbitClient
+
+	// Watch the directory because the file gets re-created (i.e. first removed and then created)
+	// when password is updated by Vault agent and fsnotify will stop watching a re-created file.
+	watchDir := filepath.Dir(u.DefaultUserFile)
+	u.WatchDir = watchDir
+
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		log.Error(err, "failed to create watcher")
+		return
+	}
+	defer watcher.Close()
+	u.Watcher = watcher
+
+	// Remove trailing new line (.rabbitmqadmin.conf has only one section).
+	ini.PrettySection = false
+
+	// This channel will contain a value when the Pod gets terminated.
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGTERM, syscall.SIGINT)
+
+	// This channel will contain a value when our program terminates itself.
+	// This is preferred over calling os.Exit() because os.Exit() does not run deferred functions.
+	done := make(chan bool, 1)
+	u.Done = done
+
+	go u.HandleEvents()
+
+	log.V(1).Info("start watching", "directory", watchDir)
+	if err := watcher.Add(watchDir); err != nil {
+		log.Error(err, "cannot watch", "directory", watchDir)
+		return
+	}
+
+	select {
+	case sig := <-sigs:
+		log.V(1).Info("terminating", "signal", sig.String())
+	case <-done:
+		log.V(1).Info("terminating")
+	}
+}
+
+func newRabbitClient(log logr.Logger, managementURI, caFile string) (updater.RabbitClient, error) {
+	if strings.HasPrefix(managementURI, "https") {
+		caCert, err := ioutil.ReadFile(caFile)
+		if err != nil {
+			log.Error(err, "failed to read CA file", "file", caFile)
+			return nil, err
+		}
+		caCertPool := x509.NewCertPool()
+		caCertPool.AppendCertsFromPEM(caCert)
+		tlsConfig := &tls.Config{
+			RootCAs: caCertPool,
+		}
+		transport := &http.Transport{TLSClientConfig: tlsConfig}
+		rmqc, err := rabbithole.NewTLSClient(managementURI, "", "", transport)
+		if err != nil {
+			log.Error(err, "failed to create rabbithole TLS client", "uri", managementURI, "ca-file", caFile)
+			return nil, err
+		}
+		return rabbitHoleClientWrapper{rmqc}, nil
+	}
+	rmqc, err := rabbithole.NewClient(managementURI, "", "")
+	if err != nil {
+		log.Error(err, "failed to create rabbithole client", "uri", managementURI)
+		return nil, err
+	}
+	return rabbitHoleClientWrapper{rmqc}, nil
+}
+
+type rabbitHoleClientWrapper struct {
+	rabbitHoleClient *rabbithole.Client
+}
+
+func (w rabbitHoleClientWrapper) GetUser(username string) (*rabbithole.UserInfo, error) {
+	return w.rabbitHoleClient.GetUser(username)
+}
+func (w rabbitHoleClientWrapper) PutUser(username string, info rabbithole.UserSettings) (*http.Response, error) {
+	return w.rabbitHoleClient.PutUser(username, info)
+}
+func (w rabbitHoleClientWrapper) Whoami() (*rabbithole.WhoamiInfo, error) {
+	return w.rabbitHoleClient.Whoami()
+}
+func (w rabbitHoleClientWrapper) GetUsername() string {
+	return w.rabbitHoleClient.Username
+}
+func (w rabbitHoleClientWrapper) SetUsername(username string) {
+	w.rabbitHoleClient.Username = username
+}
+func (w rabbitHoleClientWrapper) SetPassword(passwd string) {
+	w.rabbitHoleClient.Password = passwd
+}