Initial commit, initial implementation of package pkg/crt.

.gitignore

+*~

COPYING

+See LICENSE for details.
+

LICENSE

+Copyright (c) 2020 UPLEX Nils Goroll Systemoptimierung
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.

Makefile

+# Copyright (c) 2020 UPLEX Nils Goroll Systemoptimierung
+# All rights reserved
+#
+# Author: Geoffrey Simmons <geoffrey.simmons@uplex.de>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+all: build
+
+CODE_SUBDIRS=./pkg/...
+build:
+	go fmt $(CODE_SUBDIRS)
+	go generate $(CODE_SUBDIRS)
+	go build $(CODE_SUBDIRS)
+
+check: build
+	golint ./pkg/crt/...
+	go test -v ./pkg/crt/...
+
+test: check
+
+clean:
+	go clean $(CODE_SUBDIRS)

README.md

+# Kubernetes Certiicate Downloader
+
+An application that watches TLS Secrets in a Kubernetes cluster, and
+provides a REST API with which a client can instruct the app to save
+Secrets as certificate/key files in a local directory, or to update or
+delete existing files.
+
+This application is primarily meant to support the use of
+[haproxy](http://www.haproxy.org/), in particular since it saves the
+TLS certificates and keys concatenated in single files, as haproxy
+requires.

go.mod

+module code.uplex.de/k8s/k8s-crt-dnldr
+
+require (
+	github.com/sirupsen/logrus v1.6.0
+	golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f
+	k8s.io/api v0.16.4
+	k8s.io/apimachinery v0.16.4
+	k8s.io/client-go v0.16.4
+)

go.sum

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pkg/crt/crt.go

+/*
+ * Copyright (c) 2020 UPLEX Nils Goroll Systemoptimierung
+ * All rights reserved
+ *
+ * Author: Geoffrey Simmons <geoffrey.simmons@uplex.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+// Package crt encapsulates the validation and retrieval of a TLS
+// Secret's data from a Kubernetes client-go lister. Only the
+// crt.Getter type should be used to access the contents of Secrets.
+package crt
+
+import (
+	"errors"
+
+	api_v1 "k8s.io/api/core/v1"
+	k8s_errors "k8s.io/apimachinery/pkg/api/errors"
+	core_v1_listers "k8s.io/client-go/listers/core/v1"
+)
+
+const (
+	crtKey = "tls.crt"
+	keyKey = "tls.key"
+)
+
+// A Getter retrieves and validates data from TLS Secrets.
+type Getter struct {
+	lister core_v1_listers.SecretLister
+}
+
+// NewGetter returns a new instance of Getter, which retrieves data
+// from the client-go SecretLister that is provided. This should be
+// the same lister that is populated by a client-go client that is
+// watching the cluster API.
+func NewGetter(lister core_v1_listers.SecretLister) *Getter {
+	return &Getter{lister: lister}
+}
+
+// Get retrieves a Secret's data based on its Namespace and Name, and
+// optionally on its UID and ResourceVersion. If found, the Secret is
+// checked for validity as a TLS Secret.
+//
+// ns and name MUST be set to the Namespace and Name of the desired
+// Secret. Either or both of uid and version MAY be empty. If uid
+// and/or version is non-empty, then the Secret is found iff the
+// corresponding UID and/or ResourceVersion of the Secret match. This
+// way, a client can request a specific version of the Secret, or just
+// the version of the Secret currently stored by the SecretLister.
+//
+// The return value found is true iff the Secret is found.
+//
+// If the Secret is found, then it is validated as a TLS Secret. Both
+// of the keys "tls.crt" and "tls.key" MUST be present in the Secret
+// data, and their values MUST be non-empty. If one of the two keys is
+// missing, then the return value valid is false, and err is non-nil,
+// returning the message "required field missing". If one of the
+// values is empty, then valid is false and non-nil err returns the
+// message "required field empty".
+//
+// Moreover, the Secret's type field MUST be set to
+// "kubernetes.io/tls".  Otherwise valid is false, and non-nil err
+// returns the message "invalid type value". (This should never happen
+// if the watcher that populates the SecretLister filters Secrets for
+// this value of type).
+//
+// No more than one of the return values found or valid will be false.
+// Retrieval and validation of the Secret was successful if found and
+// valid are both true, and err is nil.
+//
+// If the operation was successful, then the return values crt and key
+// contain the values from "tls.crt" and "tls.key" in the Secret data.
+// The return values suid and sversion contain the values of the
+// Secret's UID and ResourceVersion fields.
+func (getter *Getter) Get(
+	ns, name, uid, version string,
+) (crt, key []byte, suid, sversion string, found, valid bool, err error) {
+	valid = true
+	nsLister := getter.lister.Secrets(ns)
+	secret, err := nsLister.Get(name)
+	if err != nil {
+		if k8s_errors.IsNotFound(err) {
+			return
+		}
+		found = true
+		return
+	}
+	suid = string(secret.UID)
+	sversion = secret.ResourceVersion
+	if uid != "" && suid != uid {
+		return
+	}
+	if version != "" && sversion != version {
+		return
+	}
+	found = true
+
+	if secret.Type != api_v1.SecretTypeTLS {
+		err = errors.New("invalid type value")
+		valid = false
+		return
+	}
+	crt, valid = secret.Data[crtKey]
+	if !valid {
+		err = errors.New("required field missing")
+		return
+	}
+	if len(crt) == 0 {
+		valid = false
+		err = errors.New("required field empty")
+		return
+	}
+	key, valid = secret.Data[keyKey]
+	if !valid {
+		err = errors.New("required field missing")
+		return
+	}
+	if len(key) == 0 {
+		valid = false
+		err = errors.New("required field empty")
+	}
+	return
+}

pkg/crt/crt_test.go

+/*
+ * Copyright (c) 2020 UPLEX Nils Goroll Systemoptimierung
+ * All rights reserved
+ *
+ * Author: Geoffrey Simmons <geoffrey.simmons@uplex.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+package crt
+
+import (
+	"context"
+	"testing"
+
+	api_v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes/fake"
+	core_v1_listers "k8s.io/client-go/listers/core/v1"
+	"k8s.io/client-go/tools/cache"
+)
+
+func setupSecretLister(client *fake.Clientset) core_v1_listers.SecretLister {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	infFactory := informers.NewSharedInformerFactory(client, 0)
+	informer := infFactory.Core().V1().Secrets().Informer()
+	lister := infFactory.Core().V1().Secrets().Lister()
+
+	infFactory.Start(ctx.Done())
+	cache.WaitForCacheSync(ctx.Done(), informer.HasSynced)
+	return lister
+}
+
+func TestGetter(t *testing.T) {
+	client := fake.NewSimpleClientset(
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "ns",
+				Name:            "secret",
+				UID:             "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1",
+				ResourceVersion: "4711",
+			},
+			Data: map[string][]byte{
+				crtKey: []byte("crtSecret"),
+				keyKey: []byte("keySecret"),
+			},
+			Type: api_v1.SecretType("kubernetes.io/tls"),
+		},
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "missing",
+				Name:            "crtField",
+				UID:             "3acf5e0a-1642-48f4-886f-4de83fd17f41",
+				ResourceVersion: "0815",
+			},
+			Data: map[string][]byte{
+				"foo":  []byte("fooVal"),
+				keyKey: []byte("keySecret"),
+			},
+			Type: api_v1.SecretType("kubernetes.io/tls"),
+		},
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "missing",
+				Name:            "keyField",
+				UID:             "ea49b70e-c4ec-4b77-82e8-9c02e542f7af",
+				ResourceVersion: "123456",
+			},
+			Data: map[string][]byte{
+				crtKey: []byte("crtSecret"),
+				"foo":  []byte("fooVal"),
+			},
+			Type: api_v1.SecretType("kubernetes.io/tls"),
+		},
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "empty",
+				Name:            "crtField",
+				UID:             "50dabc9a-d4e4-4db7-9b2a-563becd5fb06",
+				ResourceVersion: "347360",
+			},
+			Data: map[string][]byte{
+				crtKey: []byte{},
+				keyKey: []byte("keySecret"),
+			},
+			Type: api_v1.SecretType("kubernetes.io/tls"),
+		},
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "empty",
+				Name:            "keyField",
+				UID:             "35df2a46-4299-4fe7-9d81-04314a0ef4b4",
+				ResourceVersion: "956928",
+			},
+			Data: map[string][]byte{
+				crtKey: []byte("crtSecret"),
+				keyKey: []byte{},
+			},
+			Type: api_v1.SecretType("kubernetes.io/tls"),
+		},
+		&api_v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:       "invalid",
+				Name:            "typeField",
+				UID:             "688d59a2-6853-41bc-880c-62ea1e29e24a",
+				ResourceVersion: "654321",
+			},
+			Data: map[string][]byte{
+				crtKey: []byte("crtSecret"),
+				keyKey: []byte("keySecret"),
+			},
+			Type: api_v1.SecretType("foo/bar"),
+		},
+	)
+	lister := setupSecretLister(client)
+	getter := NewGetter(lister)
+
+	crt, key, suid, sversion, found, valid, err := getter.Get(
+		"ns", "secret", "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1", "4711")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+	if string(crt) != "crtSecret" {
+		t.Errorf("crt: got %s want crtSecret", string(crt))
+	}
+	if string(key) != "keySecret" {
+		t.Errorf("key: got %s want keySecret", string(key))
+	}
+	if suid != "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1" {
+		t.Errorf("suid: got %s want %s", suid,
+			"4cfffc85-1e86-4ebf-92f2-1d3fd61242f1")
+	}
+	if sversion != "4711" {
+		t.Errorf("sversion: got %s want 4711", sversion)
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "secret", "", "4711")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+	if string(crt) != "crtSecret" {
+		t.Errorf("crt: got %s want crtSecret", string(crt))
+	}
+	if string(key) != "keySecret" {
+		t.Errorf("key: got %s want keySecret", string(key))
+	}
+	if suid != "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1" {
+		t.Errorf("suid: got %s want %s", suid,
+			"4cfffc85-1e86-4ebf-92f2-1d3fd61242f1")
+	}
+	if sversion != "4711" {
+		t.Errorf("sversion: got %s want 4711", sversion)
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "secret", "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1", "")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+	if string(crt) != "crtSecret" {
+		t.Errorf("crt: got %s want crtSecret", string(crt))
+	}
+	if string(key) != "keySecret" {
+		t.Errorf("key: got %s want keySecret", string(key))
+	}
+	if suid != "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1" {
+		t.Errorf("suid: got %s want %s", suid,
+			"4cfffc85-1e86-4ebf-92f2-1d3fd61242f1")
+	}
+	if sversion != "4711" {
+		t.Errorf("sversion: got %s want 4711", sversion)
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "secret", "", "")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+	if string(crt) != "crtSecret" {
+		t.Errorf("crt: got %s want crtSecret", string(crt))
+	}
+	if string(key) != "keySecret" {
+		t.Errorf("key: got %s want keySecret", string(key))
+	}
+	if suid != "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1" {
+		t.Errorf("suid: got %s want %s", suid,
+			"4cfffc85-1e86-4ebf-92f2-1d3fd61242f1")
+	}
+	if sversion != "4711" {
+		t.Errorf("sversion: got %s want 4711", sversion)
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "foo", "", "")
+	if err == nil {
+		t.Error("err: got nil want non-nil")
+	}
+	if found {
+		t.Error("found: got true want false")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "foo", "", "")
+	if err == nil {
+		t.Error("err: got nil want non-nil")
+	}
+	if found {
+		t.Error("found: got true want false")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"foo", "secret", "", "")
+	if err == nil {
+		t.Error("err: got nil want non-nil")
+	}
+	if found {
+		t.Error("found: got true want false")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "secret", "0815", "4711")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if found {
+		t.Error("found: got true want false")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"ns", "secret", "4cfffc85-1e86-4ebf-92f2-1d3fd61242f1", "0815")
+	if err != nil {
+		t.Errorf("err: got %+v want nil", err)
+	}
+	if found {
+		t.Error("found: got true want false")
+	}
+	if !valid {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"missing", "crtField", "", "")
+	if valid {
+		t.Error("valid: got true want false")
+	}
+	if err == nil {
+		t.Fatal("err: got nil want non-nil")
+	}
+	if err.Error() != "required field missing" {
+		t.Errorf("err msg: want \"required field missing\" got %s",
+			err.Error())
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"missing", "keyField", "", "")
+	if valid {
+		t.Error("valid: got true want false")
+	}
+	if err == nil {
+		t.Fatal("err: got nil want non-nil")
+	}
+	if err.Error() != "required field missing" {
+		t.Errorf("err msg: want \"required field missing\" got %s",
+			err.Error())
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"empty", "crtField", "", "")
+	if valid {
+		t.Error("valid: got true want false")
+	}
+	if err == nil {
+		t.Fatal("err: got nil want non-nil")
+	}
+	if err.Error() != "required field empty" {
+		t.Errorf("err msg: want \"required field empty\" got %s",
+			err.Error())
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"empty", "keyField", "", "")
+	if valid {
+		t.Error("valid: got true want false")
+	}
+	if err == nil {
+		t.Fatal("err: got nil want non-nil")
+	}
+	if err.Error() != "required field empty" {
+		t.Errorf("err msg: want \"required field empty\" got %s",
+			err.Error())
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+
+	crt, key, suid, sversion, found, valid, err = getter.Get(
+		"invalid", "typeField", "", "")
+	if valid {
+		t.Error("valid: got true want false")
+	}
+	if err == nil {
+		t.Fatal("err: got nil want non-nil")
+	}
+	if err.Error() != "invalid type value" {
+		t.Errorf("err msg: want \"invalid type value\" got %s",
+			err.Error())
+	}
+	if !found {
+		t.Error("found: got false want true")
+	}
+}