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Vegard Engen
2025-06-22 20:41:52 +02:00
commit 88d5f3ca89
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# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib
# Test binary, build with `go test -c`
*.test
/_out/
# Output of the go coverage tool, specifically when used with LiteIDE
*.out
# Ignore the built binary
./cert-manager-webhook-linode

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FROM golang:1.22-alpine3.19 AS build_deps
RUN apk add --no-cache git
WORKDIR /workspace
COPY go.mod .
COPY go.sum .
RUN go mod download
FROM build_deps AS build
COPY . .
RUN CGO_ENABLED=0 go build -o webhook -ldflags '-w -extldflags "-static"' .
FROM alpine:3.18
RUN apk add --no-cache ca-certificates
COPY --from=build /workspace/webhook /usr/local/bin/webhook
ENTRYPOINT ["webhook"]

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IMAGE_NAME := "registry.engen.priv.no/cert-manager-webhook-linode"
IMAGE_TAG := "v0.3.0"
K8S_VERSION := "1.28.0"
OUT := $(shell pwd)/_out
$(shell mkdir -p "$(OUT)")
.DEFAULT_GOAL := build
.PHONY: verify test build clean _out/kubebuilder rendered-manifest.yaml
verify: _out/kubebuilder
TEST_ASSET_ETCD=_out/kubebuilder/bin/etcd \
TEST_ASSET_KUBECTL=_out/kubebuilder/bin/kubectl \
TEST_ASSET_KUBE_APISERVER=_out/kubebuilder/bin/kube-apiserver \
go test -v
_out/kubebuilder:
mkdir -p _out/kubebuilder
curl -fsSLo envtest-bins.tar.gz "https://go.kubebuilder.io/test-tools/${K8S_VERSION}/$(shell go env GOOS)/$(shell go env GOARCH)"
tar -C _out/kubebuilder --strip-components=1 -zvxf envtest-bins.tar.gz
rm envtest-bins.tar.gz
test: verify
build:
docker build --rm -t "${IMAGE_NAME}:${IMAGE_TAG}" -t "${IMAGE_NAME}:latest" .
clean:
rm -r "${OUT}"
rendered-manifest.yaml:
helm template \
--set image.repository=${IMAGE_NAME} \
--set image.tag=${IMAGE_TAG} \
deploy/cert-manager-webhook-linode > "${OUT}/rendered-manifest.yaml"

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# Cert-Manager ACME DNS01 Webhook Solver for Linode DNS Manager
[![Go Report Card](https://goreportcard.com/badge/github.com/slicen/cert-manager-webhook-linode)](https://goreportcard.com/report/github.com/slicen/cert-manager-webhook-linode)
[![Releases](https://img.shields.io/github/v/release/slicen/cert-manager-webhook-linode?include_prereleases)](https://github.com/slicen/cert-manager-webhook-linode/releases)
[![LICENSE](https://img.shields.io/github/license/slicen/cert-manager-webhook-linode)](https://github.com/slicen/cert-manager-webhook-linode/blob/master/LICENSE)
A webhook to use [Linode DNS
Manager](https://www.linode.com/docs/platform/manager/dns-manager) as a DNS01
ACME Issuer for [cert-manager](https://github.com/jetstack/cert-manager).
## Installation
```bash
helm install cert-manager-webhook-linode \
--namespace cert-manager \
https://github.com/linode/cert-manager-webhook-linode/releases/download/v0.3.0/cert-manager-webhook-linode-v0.3.0.tgz
```
## Usage
### Create Linode API Token Secret
```bash
kubectl create secret generic linode-credentials \
--namespace=cert-manager \
--from-literal=token=<LINODE TOKEN>
```
### Create Issuer
#### Cluster-wide Linode API Token
```yaml
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-staging
spec:
acme:
server: https://acme-staging-v02.api.letsencrypt.org/directory
email: example@example.com
privateKeySecretRef:
name: letsencrypt-staging
solvers:
- dns01:
webhook:
solverName: linode
groupName: acme.slicen.me
```
By default, the Linode API token used will be obtained from the
linode-credentials Secret in the same namespace as the webhook.
#### Per Namespace Linode API Tokens
If you would prefer to use separate Linode API tokens for each namespace (e.g.
in a multi-tenant environment):
```yaml
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
name: letsencrypt-staging
namespace: default
spec:
acme:
server: https://acme-staging-v02.api.letsencrypt.org/directory
email: example@example.com
privateKeySecretRef:
name: letsencrypt-staging
solvers:
- dns01:
webhook:
solverName: linode
groupName: acme.slicen.me
config:
apiKeySecretRef:
name: linode-credentials
key: token
```
## Development
### Running the test suite
Conformance testing is achieved through Kubernetes emulation via the
kubebuilder-tools suite, in conjunction with real calls to the Linode API on an
test domain, using a valid API token.
The test configures a cert-manager-dns01-tests TXT entry, attempts to verify its
presence, and removes the entry, thereby verifying the Prepare and CleanUp
functions.
Run the test suite with:
```bash
export LINODE_TOKEN=$(echo -n "<your API token>" | base64 -w 0)
envsubst < testdata/linode/secret.yaml.example > testdata/linode/secret.yaml
TEST_ZONE_NAME=yourdomain.com. make verify
```

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# Patterns to ignore when building packages.
# This supports shell glob matching, relative path matching, and
# negation (prefixed with !). Only one pattern per line.
.DS_Store
# Common VCS dirs
.git/
.gitignore
.bzr/
.bzrignore
.hg/
.hgignore
.svn/
# Common backup files
*.swp
*.bak
*.tmp
*~
# Various IDEs
.project
.idea/
*.tmproj

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apiVersion: v2
appVersion: "v0.3.0"
description: A Helm chart for cert-manager-webhook-linode
name: cert-manager-webhook-linode
version: v0.3.0

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{{/* vim: set filetype=mustache: */}}
{{/*
Expand the name of the chart.
*/}}
{{- define "cert-manager-webhook-linode.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
{{- end -}}
{{/*
Create a default fully qualified app name.
We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
If release name contains chart name it will be used as a full name.
*/}}
{{- define "cert-manager-webhook-linode.fullname" -}}
{{- if .Values.fullnameOverride -}}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- $name := default .Chart.Name .Values.nameOverride -}}
{{- if contains $name .Release.Name -}}
{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
{{- end -}}
{{- end -}}
{{- end -}}
{{/*
Create chart name and version as used by the chart label.
*/}}
{{- define "cert-manager-webhook-linode.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
{{- end -}}
{{- define "cert-manager-webhook-linode.selfSignedIssuer" -}}
{{ printf "%s-selfsign" (include "cert-manager-webhook-linode.fullname" .) }}
{{- end -}}
{{- define "cert-manager-webhook-linode.rootCAIssuer" -}}
{{ printf "%s-ca" (include "cert-manager-webhook-linode.fullname" .) }}
{{- end -}}
{{- define "cert-manager-webhook-linode.rootCACertificate" -}}
{{ printf "%s-ca" (include "cert-manager-webhook-linode.fullname" .) }}
{{- end -}}
{{- define "cert-manager-webhook-linode.servingCertificate" -}}
{{ printf "%s-webhook-tls" (include "cert-manager-webhook-linode.fullname" .) }}
{{- end -}}

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apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
name: v1alpha1.{{ .Values.api.groupName }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
annotations:
cert-manager.io/inject-ca-from: "{{ .Release.Namespace }}/{{ include "cert-manager-webhook-linode.servingCertificate" . }}"
spec:
group: {{ .Values.api.groupName }}
groupPriorityMinimum: 1000
versionPriority: 15
service:
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
version: v1alpha1

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apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
replicas: {{ .Values.replicaCount }}
selector:
matchLabels:
app: {{ include "cert-manager-webhook-linode.name" . }}
release: {{ .Release.Name }}
template:
metadata:
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
release: {{ .Release.Name }}
spec:
serviceAccountName: {{ include "cert-manager-webhook-linode.fullname" . }}
containers:
- name: {{ .Chart.Name }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
args:
- --tls-cert-file=/tls/tls.crt
- --tls-private-key-file=/tls/tls.key
{{- if .Values.deployment.logLevel }}
- --v={{ .Values.deployment.logLevel }}
{{- end }}
env:
- name: GROUP_NAME
value: {{ .Values.api.groupName | quote }}
- name: POD_SECRET_NAME
value: {{ .Values.deployment.secretName | quote }}
- name: POD_SECRET_KEY
value: {{ .Values.deployment.secretKey | quote }}
ports:
- name: https
containerPort: 443
protocol: TCP
livenessProbe:
httpGet:
scheme: HTTPS
path: /healthz
port: https
readinessProbe:
httpGet:
scheme: HTTPS
path: /healthz
port: https
volumeMounts:
- name: certs
mountPath: /tls
readOnly: true
resources:
{{ toYaml .Values.resources | indent 12 }}
volumes:
- name: certs
secret:
secretName: {{ include "cert-manager-webhook-linode.servingCertificate" . }}
{{- with .Values.nodeSelector }}
nodeSelector:
{{ toYaml . | indent 8 }}
{{- end }}
{{- with .Values.affinity }}
affinity:
{{ toYaml . | indent 8 }}
{{- end }}
{{- with .Values.tolerations }}
tolerations:
{{ toYaml . | indent 8 }}
{{- end }}

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---
# Create a selfsigned Issuer, in order to create a root CA certificate for
# signing webhook serving certificates
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
name: {{ include "cert-manager-webhook-linode.selfSignedIssuer" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
selfSigned: {}
---
# Generate a CA Certificate used to sign certificates for the webhook
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
name: {{ include "cert-manager-webhook-linode.rootCACertificate" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
secretName: {{ include "cert-manager-webhook-linode.rootCACertificate" . }}
duration: 43800h # 5y
issuerRef:
name: {{ include "cert-manager-webhook-linode.selfSignedIssuer" . }}
commonName: "ca.cert-manager-webhook-linode.cert-manager"
isCA: true
---
# Create an Issuer that uses the above generated CA certificate to issue certs
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
name: {{ include "cert-manager-webhook-linode.rootCAIssuer" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
ca:
secretName: {{ include "cert-manager-webhook-linode.rootCACertificate" . }}
---
# Finally, generate a serving certificate for the webhook to use
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
name: {{ include "cert-manager-webhook-linode.servingCertificate" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
secretName: {{ include "cert-manager-webhook-linode.servingCertificate" . }}
duration: 8760h # 1y
issuerRef:
name: {{ include "cert-manager-webhook-linode.rootCAIssuer" . }}
dnsNames:
- {{ include "cert-manager-webhook-linode.fullname" . }}
- {{ include "cert-manager-webhook-linode.fullname" . }}.{{ .Values.certManager.namespace }}
- {{ include "cert-manager-webhook-linode.fullname" . }}.{{ .Values.certManager.namespace }}.svc

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apiVersion: v1
kind: ServiceAccount
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
---
# Grant the webhook permission to read the ConfigMap containing the Kubernetes
# apiserver's requestheader-ca-certificate.
# This ConfigMap is automatically created by the Kubernetes apiserver.
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:webhook-authentication-reader
namespace: kube-system
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: extension-apiserver-authentication-reader
subjects:
- apiGroup: ""
kind: ServiceAccount
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
---
# apiserver gets the auth-delegator role to delegate auth decisions to
# the core apiserver
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:auth-delegator
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:auth-delegator
subjects:
- apiGroup: ""
kind: ServiceAccount
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
---
# Grant cert-manager permission to validate using our apiserver
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:domain-solver
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
rules:
- apiGroups:
- {{ .Values.api.groupName }}
resources:
- "*"
verbs:
- "create"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:domain-solver
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: {{ include "cert-manager-webhook-linode.fullname" . }}:domain-solver
subjects:
- apiGroup: ""
kind: ServiceAccount
name: {{ .Values.certManager.serviceAccountName }}
namespace: {{ .Values.certManager.namespace | quote }}
---
# Grant the webhook permission to read the Secret containing the Linode API token
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:secret-reader
namespace: {{ .Values.certManager.namespace | quote }}
rules:
- apiGroups: [""]
resources: ["secrets"]
resourceNames: [{{ .Values.deployment.secretName }}]
verbs: ["get", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}:secret-reader
namespace: {{ .Values.certManager.namespace | quote }}
subjects:
- apiGroup: ""
kind: ServiceAccount
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
roleRef:
kind: Role
name: {{ include "cert-manager-webhook-linode.fullname" . }}:secret-reader
apiGroup: rbac.authorization.k8s.io

20
deploy/cert-manager-webhook-linode/templates/service.yaml Normal file
View File

@@ -0,0 +1,20 @@
apiVersion: v1
kind: Service
metadata:
name: {{ include "cert-manager-webhook-linode.fullname" . }}
namespace: {{ .Values.certManager.namespace | quote }}
labels:
app: {{ include "cert-manager-webhook-linode.name" . }}
chart: {{ include "cert-manager-webhook-linode.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
spec:
type: {{ .Values.service.type }}
ports:
- port: {{ .Values.service.port }}
targetPort: https
protocol: TCP
name: https
selector:
app: {{ include "cert-manager-webhook-linode.name" . }}
release: {{ .Release.Name }}

49
deploy/cert-manager-webhook-linode/values.yaml Normal file
View File

@@ -0,0 +1,49 @@
# The GroupName here is used to identify your company or business unit that
# created this webhook.
# For example, this may be "acme.mycompany.com".
# This name will need to be referenced in each Issuer's `webhook` stanza to
# inform cert-manager of where to send ChallengePayload resources in order to
# solve the DNS01 challenge.
# This group name should be **unique**, hence using your own company's domain
# here is recommended.
api:
groupName: acme.slicen.me
certManager:
namespace: cert-manager
serviceAccountName: cert-manager
deployment:
secretName: linode-credentials
secretKey: token
logLevel: 6
image:
repository: registry.engen.priv.no/cert-manager-webhook-linode
tag: latest
pullPolicy: IfNotPresent
nameOverride: ""
fullnameOverride: ""
service:
type: ClusterIP
port: 443
resources: {}
# We usually recommend not to specify default resources and to leave this as a conscious
# choice for the user. This also increases chances charts run on environments with little
# resources, such as Minikube. If you do want to specify resources, uncomment the following
# lines, adjust them as necessary, and remove the curly braces after 'resources:'.
# limits:
# cpu: 100m
# memory: 128Mi
# requests:
# cpu: 100m
# memory: 128Mi
nodeSelector: {}
tolerations: []
affinity: {}

113
go.mod Normal file
View File

@@ -0,0 +1,113 @@
module github.com/linode/cert-manager-webhook-linode
go 1.22.0
toolchain go1.22.6
require (
github.com/cert-manager/cert-manager v1.15.3
github.com/linode/linodego v1.40.0
golang.org/x/oauth2 v0.22.0
k8s.io/apiextensions-apiserver v0.30.2
k8s.io/apimachinery v0.30.2
k8s.io/client-go v0.30.2
k8s.io/klog/v2 v2.130.1
)
require (
github.com/NYTimes/gziphandler v1.1.1 // indirect
github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df // indirect
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
github.com/beorn7/perks v1.0.1 // indirect
github.com/blang/semver/v4 v4.0.0 // indirect
github.com/cenkalti/backoff/v4 v4.3.0 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/coreos/go-semver v0.3.1 // indirect
github.com/coreos/go-systemd/v22 v22.5.0 // indirect
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
github.com/emicklei/go-restful/v3 v3.12.0 // indirect
github.com/evanphx/json-patch v5.9.0+incompatible // indirect
github.com/evanphx/json-patch/v5 v5.9.0 // indirect
github.com/felixge/httpsnoop v1.0.4 // indirect
github.com/fsnotify/fsnotify v1.7.0 // indirect
github.com/go-logr/logr v1.4.1 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/go-logr/zapr v1.3.0 // indirect
github.com/go-openapi/jsonpointer v0.21.0 // indirect
github.com/go-openapi/jsonreference v0.21.0 // indirect
github.com/go-openapi/swag v0.23.0 // indirect
github.com/go-resty/resty/v2 v2.13.1 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
github.com/golang/protobuf v1.5.4 // indirect
github.com/google/cel-go v0.17.8 // 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 v1.6.0 // indirect
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 // indirect
github.com/imdario/mergo v0.3.16 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // 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/miekg/dns v1.1.59 // 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/pkg/errors v0.9.1 // indirect
github.com/prometheus/client_golang v1.18.0 // indirect
github.com/prometheus/client_model v0.6.1 // indirect
github.com/prometheus/common v0.46.0 // indirect
github.com/prometheus/procfs v0.15.0 // indirect
github.com/spf13/cobra v1.8.0 // indirect
github.com/spf13/pflag v1.0.5 // indirect
github.com/stoewer/go-strcase v1.3.0 // indirect
go.etcd.io/etcd/api/v3 v3.5.13 // indirect
go.etcd.io/etcd/client/pkg/v3 v3.5.13 // indirect
go.etcd.io/etcd/client/v3 v3.5.13 // indirect
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.51.0 // indirect
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.51.0 // indirect
go.opentelemetry.io/otel v1.26.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.26.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.26.0 // indirect
go.opentelemetry.io/otel/metric v1.26.0 // indirect
go.opentelemetry.io/otel/sdk v1.26.0 // indirect
go.opentelemetry.io/otel/trace v1.26.0 // indirect
go.opentelemetry.io/proto/otlp v1.2.0 // indirect
go.uber.org/multierr v1.11.0 // indirect
go.uber.org/zap v1.27.0 // indirect
golang.org/x/crypto v0.26.0 // indirect
golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
golang.org/x/mod v0.17.0 // indirect
golang.org/x/net v0.28.0 // indirect
golang.org/x/sync v0.8.0 // indirect
golang.org/x/sys v0.23.0 // indirect
golang.org/x/term v0.23.0 // indirect
golang.org/x/text v0.17.0 // indirect
golang.org/x/time v0.5.0 // indirect
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20240515191416-fc5f0ca64291 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20240515191416-fc5f0ca64291 // indirect
google.golang.org/grpc v1.64.1 // indirect
google.golang.org/protobuf v1.34.1 // indirect
gopkg.in/inf.v0 v0.9.1 // indirect
gopkg.in/ini.v1 v1.67.0 // indirect
gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
gopkg.in/yaml.v2 v2.4.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
k8s.io/api v0.30.2 // indirect
k8s.io/apiserver v0.30.2 // indirect
k8s.io/component-base v0.30.2 // indirect
k8s.io/kms v0.30.2 // indirect
k8s.io/kube-openapi v0.0.0-20240430033511-f0e62f92d13f // indirect
k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0 // indirect
sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.3 // indirect
sigs.k8s.io/controller-runtime v0.18.2 // indirect
sigs.k8s.io/gateway-api v1.1.0 // 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 v1.4.0 // indirect
)

347
go.sum Normal file
View File

@@ -0,0 +1,347 @@
github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I=
github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df h1:7RFfzj4SSt6nnvCPbCqijJi1nWCd+TqAT3bYCStRC18=
github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df/go.mod h1:pSwJ0fSY5KhvocuWSx4fz3BA8OrA1bQn+K1Eli3BRwM=
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
github.com/cert-manager/cert-manager v1.15.3 h1:/u9T0griwd5MegPfWbB7v0KcVcT9OJrEvPNhc9tl7xQ=
github.com/cert-manager/cert-manager v1.15.3/go.mod h1:stBge/DTvrhfQMB/93+Y62s+gQgZBsfL1o0C/4AL/mI=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4=
github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec=
github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
github.com/emicklei/go-restful/v3 v3.12.0 h1:y2DdzBAURM29NFF94q6RaY4vjIH1rtwDapwQtU84iWk=
github.com/emicklei/go-restful/v3 v3.12.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
github.com/evanphx/json-patch v5.9.0+incompatible h1:fBXyNpNMuTTDdquAq/uisOr2lShz4oaXpDTX2bLe7ls=
github.com/evanphx/json-patch v5.9.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
github.com/evanphx/json-patch/v5 v5.9.0 h1:kcBlZQbplgElYIlo/n1hJbls2z/1awpXxpRi0/FOJfg=
github.com/evanphx/json-patch/v5 v5.9.0/go.mod h1:VNkHZ/282BpEyt/tObQO8s5CMPmYYq14uClGH4abBuQ=
github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/go-logr/zapr v1.3.0 h1:XGdV8XW8zdwFiwOA2Dryh1gj2KRQyOOoNmBy4EplIcQ=
github.com/go-logr/zapr v1.3.0/go.mod h1:YKepepNBd1u/oyhd/yQmtjVXmm9uML4IXUgMOwR8/Gg=
github.com/go-openapi/jsonpointer v0.21.0 h1:YgdVicSA9vH5RiHs9TZW5oyafXZFc6+2Vc1rr/O9oNQ=
github.com/go-openapi/jsonpointer v0.21.0/go.mod h1:IUyH9l/+uyhIYQ/PXVA41Rexl+kOkAPDdXEYns6fzUY=
github.com/go-openapi/jsonreference v0.21.0 h1:Rs+Y7hSXT83Jacb7kFyjn4ijOuVGSvOdF2+tg1TRrwQ=
github.com/go-openapi/jsonreference v0.21.0/go.mod h1:LmZmgsrTkVg9LG4EaHeY8cBDslNPMo06cago5JNLkm4=
github.com/go-openapi/swag v0.23.0 h1:vsEVJDUo2hPJ2tu0/Xc+4noaxyEffXNIs3cOULZ+GrE=
github.com/go-openapi/swag v0.23.0/go.mod h1:esZ8ITTYEsH1V2trKHjAN8Ai7xHb8RV+YSZ577vPjgQ=
github.com/go-resty/resty/v2 v2.13.1 h1:x+LHXBI2nMB1vqndymf26quycC4aggYJ7DECYbiz03g=
github.com/go-resty/resty/v2 v2.13.1/go.mod h1:GznXlLxkq6Nh4sU59rPmUw3VtgpO3aS96ORAI6Q7d+0=
github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
github.com/golang-jwt/jwt/v4 v4.5.0 h1:7cYmW1XlMY7h7ii7UhUyChSgS5wUJEnm9uZVTGqOWzg=
github.com/golang-jwt/jwt/v4 v4.5.0/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4=
github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA=
github.com/google/cel-go v0.17.8 h1:j9m730pMZt1Fc4oKhCLUHfjj6527LuhYcYw0Rl8gqto=
github.com/google/cel-go v0.17.8/go.mod h1:HXZKzB0LXqer5lHHgfWAnlYwJaQBDKMjxjulNQzhwhY=
github.com/google/gnostic-models v0.6.8 h1:yo/ABAfM5IMRsS1VnXjTBvUb61tFIHozhlYvRgGre9I=
github.com/google/gnostic-models v0.6.8/go.mod h1:5n7qKqH0f5wFt+aWF8CW6pZLLNOfYuF5OpfBSENuI8U=
github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
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go.opentelemetry.io/proto/otlp v1.2.0 h1:pVeZGk7nXDC9O2hncA6nHldxEjm6LByfA2aN8IOkz94=
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go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
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sigs.k8s.io/gateway-api v1.1.0/go.mod h1:ZH4lHrL2sDi0FHZ9jjneb8kKnGzFWyrTya35sWUTrRs=
sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
sigs.k8s.io/structured-merge-diff/v4 v4.4.1 h1:150L+0vs/8DA78h1u02ooW1/fFq/Lwr+sGiqlzvrtq4=
sigs.k8s.io/structured-merge-diff/v4 v4.4.1/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08=
sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=

420
main.go Normal file
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package main
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
cmmeta "github.com/cert-manager/cert-manager/pkg/apis/meta/v1"
extapi "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/cmd"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/linode/linodego"
"golang.org/x/oauth2"
)
// GroupName is the K8s API group
var GroupName = os.Getenv("GROUP_NAME")
// PodNamespace is the namespace of the webhook pod
var PodNamespace = os.Getenv("POD_NAMESPACE")
// PodSecretName is the name of the secret to obtain the Linode API token from
var PodSecretName = os.Getenv("POD_SECRET_NAME")
// PodSecretKey is the key of the Linode API token within the secret POD_SECRET_NAME
var PodSecretKey = os.Getenv("POD_SECRET_KEY")
func main() {
if GroupName == "" {
panic("GROUP_NAME must be specified")
}
// This will register our external-dns DNS provider with the webhook serving
// library, making it available as an API under the provided GroupName.
// You can register multiple DNS provider implementations with a single
// webhook, where the Name() method will be used to disambiguate between
// the different implementations.
cmd.RunWebhookServer(GroupName,
&linodeDNSProviderSolver{},
)
}
// linodeDNSProviderSolver implements the provider-specific logic needed to
// 'present' an ACME challenge TXT record to Linode.
// To do so, it must implement the `github.com/jetstack/cert-manager/pkg/acme/webhook.Solver`
// interface.
type linodeDNSProviderSolver struct {
// If a Kubernetes 'clientset' is needed, you must:
// 1. uncomment the additional `client` field in this structure below
// 2. uncomment the "k8s.io/client-go/kubernetes" import at the top of the file
// 3. uncomment the relevant code in the Initialize method below
// 4. ensure your webhook's service account has the required RBAC role
// assigned to it for interacting with the Kubernetes APIs you need.
client *kubernetes.Clientset
ctx context.Context
}
// linodeDNSProviderConfig is a structure that is used to decode into when
// solving a DNS01 challenge.
// This information is provided by cert-manager, and may be a reference to
// additional configuration that's needed to solve the challenge for this
// particular certificate or issuer.
// This typically includes references to Secret resources containing DNS
// provider credentials, in cases where a 'multi-tenant' DNS solver is being
// created.
// If you do *not* require per-issuer or per-certificate configuration to be
// provided to your webhook, you can skip decoding altogether in favour of
// using CLI flags or similar to provide configuration.
// You should not include sensitive information here. If credentials need to
// be used by your provider here, you should reference a Kubernetes Secret
// resource and fetch these credentials using a Kubernetes clientset.
type linodeDNSProviderConfig struct {
// Change the two fields below according to the format of the configuration
// to be decoded.
// These fields will be set by users in the
// `issuer.spec.acme.dns01.providers.webhook.config` field.
// Expect apiKeySecretRef with name: <secret name> and key: <token field in secret>
APIKeySecretRef cmmeta.SecretKeySelector `json:"apiKeySecretRef"`
}
// Name is used as the name for this DNS solver when referencing it on the ACME
// Issuer resource.
// This should be unique **within the group name**, i.e. you can have two
// solvers configured with the same Name() **so long as they do not co-exist
// within a single webhook deployment**.
// For example, `cloudflare` may be used as the name of a solver.
func (c *linodeDNSProviderSolver) Name() string {
return "linode"
}
// Returns a linodego Client object, with Oauth token configured
func (c *linodeDNSProviderSolver) getLinodeClient(ch *v1alpha1.ChallengeRequest) (*linodego.Client, error) {
// Load config parsed from K8s
cfg, err := loadConfig(ch.Config)
if err != nil {
return nil, err
}
// Extract Linode token from K8s secret provided by config apiKeySecretRef
apiKey, err := c.getAPIKey(&cfg, ch.ResourceNamespace)
if err != nil {
return nil, fmt.Errorf("Failed to retrieve Linode API token from secret: %v", err)
}
// Create Linodego Client
tokenSource := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: *apiKey})
oauth2Client := &http.Client{
Transport: &oauth2.Transport{
Source: tokenSource,
},
}
linodeClient := linodego.NewClient(oauth2Client)
linodeClient.SetUserAgent(fmt.Sprintf("cert-manager-webhook-linode/v0.2.0 linodego/%s", linodego.Version))
return &linodeClient, nil
}
// Returns all record entries in a given Linode DNS Manager zone, specified by the domain parameter
func (c *linodeDNSProviderSolver) fetchZone(linodeClient *linodego.Client, domain string) (*linodego.Domain, error) {
// List domains
allZones, err := linodeClient.ListDomains(c.ctx, linodego.NewListOptions(0, ""))
if err != nil {
return nil, err
}
// Search for desired zone in domains
for _, zone := range allZones {
if zone.Domain == domain {
return &zone, nil
}
}
return nil, nil
}
// Returns the details of a given record entry in a given Linode DNS Manager zone, specified by the zone's ID and the record
func (c *linodeDNSProviderSolver) fetchRecord(linodeClient *linodego.Client, zoneID int, entry string) (*linodego.DomainRecord, error) {
// List records in zone
records, err := linodeClient.ListDomainRecords(c.ctx, zoneID, nil)
if err != nil {
return nil, err
}
// Find entry in zone records
for _, record := range records {
if record.Name == entry && string(record.Type) == "TXT" {
return &record, nil
}
}
return nil, nil
}
// Returns the details of a given record entry in Linode DNS Manager, specified by the domain and record
// Wraper for fetchZone and fetchRecord
func (c *linodeDNSProviderSolver) fetchZoneAndRecord(linodeClient *linodego.Client, domain string, entry string) (*linodego.Domain, *linodego.DomainRecord, error) {
zone, err := c.fetchZone(linodeClient, domain)
if err != nil {
return zone, nil, fmt.Errorf("Failed to fetch zone `%s`: %v", domain, err)
} else if zone == nil {
return zone, nil, fmt.Errorf("Failed to find zone for `%s`", domain)
}
record, err := c.fetchRecord(linodeClient, zone.ID, entry)
if err != nil {
return zone, record, fmt.Errorf("Failed to fetch record `%s` in zone `%s`: %v", entry, domain, err)
}
return zone, record, nil
}
// Present is responsible for actually presenting the DNS record with the
// Linode DNS provider.
// This method should tolerate being called multiple times with the same value.
// cert-manager itself will later perform a self check to ensure that the
// solver has correctly configured the DNS provider.
func (c *linodeDNSProviderSolver) Present(ch *v1alpha1.ChallengeRequest) error {
klog.Infof("Presented with challenge for fqdn=%s zone=%s", ch.ResolvedFQDN, ch.ResolvedZone)
linodeClient, err := c.getLinodeClient(ch)
if err != nil {
return err
}
entry, domain := c.getDomainAndEntry(ch)
zone, record, err := c.fetchZoneAndRecord(linodeClient, domain, entry)
if err != nil {
return err
}
if record != nil {
// If entry already exists, update it
klog.Infof("Updating record for `%s` in zone `%s`", record.Name, zone.Domain)
_, err := linodeClient.UpdateDomainRecord(
c.ctx,
zone.ID,
record.ID,
linodego.DomainRecordUpdateOptions{
Name: record.Name,
Target: ch.Key,
Type: linodego.RecordTypeTXT,
Weight: getWeight(),
Port: getPort(),
Priority: getPriority(),
TTLSec: 180,
})
if err != nil {
return fmt.Errorf("Failed to update record: %v", err)
}
} else {
// Create if it does not exist
klog.Infof("Creating new record `%s` in zone `%s`", entry, zone.Domain)
_, err := linodeClient.CreateDomainRecord(
c.ctx,
zone.ID,
linodego.DomainRecordCreateOptions{
Name: entry,
Target: ch.Key,
Type: linodego.RecordTypeTXT,
Weight: getWeight(),
Port: getPort(),
Priority: getPriority(),
TTLSec: 180,
})
if err != nil {
return fmt.Errorf("Failed to create record: %v", err)
}
}
return nil
}
// Pointer int wrappers
func getWeight() *int {
weight := 1
return &weight
}
func getPort() *int {
port := 0
return &port
}
func getPriority() *int {
priority := 0
return &priority
}
// CleanUp should delete the relevant TXT record from the DNS provider console.
// If multiple TXT records exist with the same record name (e.g.
// _acme-challenge.example.com) then **only** the record with the same `key`
// value provided on the ChallengeRequest should be cleaned up.
// This is in order to facilitate multiple DNS validations for the same domain
// concurrently.
func (c *linodeDNSProviderSolver) CleanUp(ch *v1alpha1.ChallengeRequest) error {
klog.Infof("Cleaning up challenge for fqdn=%s zone=%s", ch.ResolvedFQDN, ch.ResolvedZone)
linodeClient, err := c.getLinodeClient(ch)
if err != nil {
return err
}
entry, domain := c.getDomainAndEntry(ch)
zone, record, err := c.fetchZoneAndRecord(linodeClient, domain, entry)
if err != nil {
return err
}
if record != nil {
// If entry already exists, delete it
klog.Infof("Deleting record `%s` from zone `%s`", record.Name, zone.Domain)
err := linodeClient.DeleteDomainRecord(c.ctx, zone.ID, record.ID)
if err != nil {
return fmt.Errorf("Failed to delete record: %v", err)
}
}
return nil
}
// Initialize will be called when the webhook first starts.
// This method can be used to instantiate the webhook, i.e. initialising
// connections or warming up caches.
// Typically, the kubeClientConfig parameter is used to build a Kubernetes
// client that can be used to fetch resources from the Kubernetes API, e.g.
// Secret resources containing credentials used to authenticate with DNS
// provider accounts.
// The stopCh can be used to handle early termination of the webhook, in cases
// where a SIGTERM or similar signal is sent to the webhook process.
func (c *linodeDNSProviderSolver) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
klog.Info("Initializing")
// Make a Kubernetes clientset available
var err error
c.client, err = kubernetes.NewForConfig(kubeClientConfig)
if err != nil {
return err
}
// Make context
c.ctx = context.Background()
return nil
}
// Returns a given data key from a given secret as a string
func (c *linodeDNSProviderSolver) stringFromSecret(namespace, secretName, key string) (*string, error) {
// Get secret
secret, err := c.client.CoreV1().Secrets(namespace).Get(c.ctx,
secretName, metav1.GetOptions{})
if err != nil {
return nil, err
}
// Extract token from secret
tokenBinary, ok := secret.Data[key]
if !ok {
return nil, fmt.Errorf("Key `%q` not found in secret `%s/%s`",
key, namespace, secretName)
}
token := string(tokenBinary)
return &token, nil
}
func (c *linodeDNSProviderSolver) certNamespaceToken(namespace string, secretRef cmmeta.SecretKeySelector) (*string, error) {
if secretRef.LocalObjectReference.Name == "" {
return nil, fmt.Errorf("Linode API token secret in certificate namespace not specified")
}
token, err := c.stringFromSecret(namespace, secretRef.LocalObjectReference.Name, secretRef.Key)
if err != nil {
return nil, err
}
return token, nil
}
func (c *linodeDNSProviderSolver) podNamespaceToken() (*string, error) {
// Get pod namespace
namespace := PodNamespace
if namespace == "" {
data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
if err != nil {
return nil, fmt.Errorf("Failed to find the webhook pod namespace: %v", err)
}
namespace = strings.TrimSpace(string(data))
if len(namespace) == 0 {
return nil, fmt.Errorf("Invalid webhook pod namespace provided")
}
}
// Get secret
token, err := c.stringFromSecret(namespace, PodSecretName, PodSecretKey)
if err != nil {
return nil, err
}
return token, nil
}
// Get Linode API token from Kubernetes secret.
func (c *linodeDNSProviderSolver) getAPIKey(cfg *linodeDNSProviderConfig, namespace string) (*string, error) {
// Get token from secret in the same namespace as the certificate if possible
token, err := c.certNamespaceToken(namespace, cfg.APIKeySecretRef)
if err == nil {
return token, nil
}
// Fallback to default secret in the same namespace as the webhook pod
klog.Infof("Failed to use certificate namespace Linode API token secret: %v", err)
klog.Info("Trying webhook pod namespace Linode API token secret")
token, err = c.podNamespaceToken()
if err == nil {
return token, nil
}
return nil, fmt.Errorf("Failed to read Linode API token secret: %v", err)
}
// loadConfig is a small helper function that decodes JSON configuration into
// the typed config struct.
func loadConfig(cfgJSON *extapi.JSON) (linodeDNSProviderConfig, error) {
cfg := linodeDNSProviderConfig{}
// handle the 'base case' where no configuration has been provided
if cfgJSON == nil {
return cfg, nil
}
if err := json.Unmarshal(cfgJSON.Raw, &cfg); err != nil {
return cfg, fmt.Errorf("error decoding solver config: %v", err)
}
return cfg, nil
}
func (c *linodeDNSProviderSolver) getDomainAndEntry(ch *v1alpha1.ChallengeRequest) (string, string) {
// Strip the zone from the fqdn to yield the entry (subdomain)
entry := strings.TrimSuffix(ch.ResolvedFQDN, ch.ResolvedZone)
entry = strings.TrimSuffix(entry, ".") // Also remove any stray .
// Remove trailing . from domain
domain := strings.TrimSuffix(ch.ResolvedZone, ".")
return entry, domain
}

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main_test.go Normal file
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package main
import (
"os"
"testing"
acmetest "github.com/cert-manager/cert-manager/test/acme"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
)
var (
zone = os.Getenv("TEST_ZONE_NAME")
)
func TestRunsSuite(t *testing.T) {
/* The manifest path should contain a file named config.json that is a
snippet of valid configuration that should be included on the
ChallengeRequest passed as part of the test cases.*/
log.SetLogger(zap.New(zap.UseDevMode(true)))
fixture := acmetest.NewFixture(&linodeDNSProviderSolver{},
acmetest.SetManifestPath("testdata/linode"),
acmetest.SetResolvedZone(zone),
acmetest.SetAllowAmbientCredentials(false),
acmetest.SetDNSServer("ns1.linode.com:53"),
)
fixture.RunConformance(t)
}

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/secret.yaml

11
testdata/linode/README.md vendored Normal file
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# Cert-Manager ACME DNS01 Webhook Solver for Linode DNS Manager
## testdata Directory
Copy the example Secret files, replacing $LINODE_TOKEN with your Linode API
token:
```bash
$ export LINODE_TOKEN=$(echo -n "<token>" | base64 -w 0)
$ envsubst < secret.yaml.example > secret.yaml
```

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testdata/linode/config.json vendored Normal file
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{
"apiKeySecretRef": {
"name": "linode-credentials",
"key": "token"
}
}

7
testdata/linode/secret.yaml.example vendored Normal file
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apiVersion: v1
kind: Secret
metadata:
name: linode-credentials
type: Opaque
data:
token: $LINODE_TOKEN