From ff373fa178ceaf9a7cd86df56bdbe804fddb31a2 Mon Sep 17 00:00:00 2001 From: Jason Hall Date: Fri, 31 Mar 2023 13:40:37 -0400 Subject: [PATCH] initial commit --- .gitignore | 9 ++ LICENSE | 201 +++++++++++++++++++++++ image-copy/README.md | 11 ++ image-copy/cmd/app/event.go | 67 ++++++++ image-copy/cmd/app/main.go | 164 +++++++++++++++++++ image-copy/go.mod | 53 +++++++ image-copy/go.sum | 256 ++++++++++++++++++++++++++++++ image-copy/hack/update-codegen.sh | 19 +++ image-copy/hack/update-deps.sh | 14 ++ image-copy/iac/main.tf | 115 ++++++++++++++ image-copy/iac/outputs.tf | 3 + image-copy/iac/terraform.tfvars | 4 + image-copy/iac/variables.tf | 30 ++++ 13 files changed, 946 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 image-copy/README.md create mode 100644 image-copy/cmd/app/event.go create mode 100644 image-copy/cmd/app/main.go create mode 100644 image-copy/go.mod create mode 100644 image-copy/go.sum create mode 100755 image-copy/hack/update-codegen.sh create mode 100755 image-copy/hack/update-deps.sh create mode 100644 image-copy/iac/main.tf create mode 100644 image-copy/iac/outputs.tf create mode 100644 image-copy/iac/terraform.tfvars create mode 100644 image-copy/iac/variables.tf diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..e5e3aa5 --- /dev/null +++ b/.gitignore @@ -0,0 +1,9 @@ +app + +# Terraform generated +.terraform/ +terraform.tfstate +terraform.tfstate.backup +terraform.tfstate.*.backup +.terraform.tfstate.lock.* +.terraform.lock.hcl diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..261eeb9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/image-copy/README.md b/image-copy/README.md new file mode 100644 index 0000000..a04942a --- /dev/null +++ b/image-copy/README.md @@ -0,0 +1,11 @@ +# `image-copy` + +This sets up a Cloud Run app to listen for `registry.push` events to a private Chainguard Registry group, and mirrors those new images to a repository in Google Artifact Registry. + +The Terraform does everything: + +- builds the mirroring app into an image using `ko_build` +- deploys the app to a Cloud Run service +- sets up a Chainguard Identity with permissions to pull from the private cgr.dev repo +- allows the Cloud Run service's SA to assume the puller identity +- sets up a subscription to notify the Cloud Run service when pushes happen to cgr.dev diff --git a/image-copy/cmd/app/event.go b/image-copy/cmd/app/event.go new file mode 100644 index 0000000..138f326 --- /dev/null +++ b/image-copy/cmd/app/event.go @@ -0,0 +1,67 @@ +/* +Copyright 2022 Chainguard, Inc. +SPDX-License-Identifier: Apache-2.0 +*/ + +package main + +// NOTE: these types will eventually be made available as part of a Chainguard +// SDK along with our API clients. + +// Occurrence is the CloudEvent payload for events. +type Occurrence struct { + Actor *Actor `json:"actor,omitempty"` + + // Body is the resource that was created. + // For this sample, it will always be RegistryPush. + Body RegistryPush `json:"body,omitempty"` +} + +// Actor is the event payload form of which identity was responsible for the +// event. +type Actor struct { + // Subject is the identity that triggered this event. + Subject string `json:"subject"` + + // Actor contains the name/value pairs for each of the claims that were + // validated to assume the identity whose UIDP appears in Subject above. + Actor map[string]string `json:"act,omitempty"` +} + +// ChangedEventType is the cloudevents event type for registry push events. +const PushEventType = "dev.chainguard.registry.push.v1" + +// RegistryPush describes an item being pushed to the registry. +type RegistryPush struct { + // Repository identifies the repository being pushed + Repository string `json:"repository"` + + // Tag holds the tag being pushed, if there is one. + Tag string `json:"tag,omitempty"` + + // Digest holds the digest being pushed. + // Digest will hold the sha256 of the content being pushed, whether that is + // a blob or a manifest. + Digest string `json:"digest"` + + // Type determines whether the object being pushed is a manifest or blob. + Type string `json:"type"` + + // When holds when the push occurred. + //When civil.DateTime `json:"when"` + + // Location holds the detected approximate location of the client who pulled. + // For example, "ColumbusOHUS" or "Minato City13JP". + Location string `json:"location"` + + // UserAgent holds the user-agent of the client who pulled. + UserAgent string `json:"user_agent" bigquery:"user_agent"` + + Error *Error `json:"error,omitempty"` +} + +type Error struct { + Status int `json:"status"` + Code string `json:"code"` + Message string `json:"message"` +} diff --git a/image-copy/cmd/app/main.go b/image-copy/cmd/app/main.go new file mode 100644 index 0000000..8feaeb3 --- /dev/null +++ b/image-copy/cmd/app/main.go @@ -0,0 +1,164 @@ +/* +Copyright 2022 Chainguard, Inc. +SPDX-License-Identifier: Apache-2.0 +*/ + +package main + +import ( + "context" + "fmt" + "io" + "log" + "net/http" + "strings" + + "cloud.google.com/go/compute/metadata" + cloudevents "github.com/cloudevents/sdk-go/v2" + cehttp "github.com/cloudevents/sdk-go/v2/protocol/http" + "github.com/coreos/go-oidc/v3/oidc" + "github.com/google/go-containerregistry/pkg/authn" + "github.com/google/go-containerregistry/pkg/crane" + "github.com/google/go-containerregistry/pkg/name" + "github.com/google/go-containerregistry/pkg/v1/google" + "github.com/kelseyhightower/envconfig" + "google.golang.org/api/idtoken" +) + +type envConfig struct { + Issuer string `envconfig:"ISSUER_URL" required:"true"` + Group string `envconfig:"GROUP" required:"true"` + Identity string `envconfig:"IDENTITY" required:"true"` + Port int `envconfig:"PORT" default:"8080" required:"true"` + DstRepo string `envconfig:"DST_REPO" required:"true"` // Fully qualified at this point. +} + +var location, sa string +var srcRepo name.Repository + +func init() { + var err error + location, err = metadata.Zone() + if err != nil { + log.Panicf("getting location: %v", err) + } + sa, err = metadata.Email("default") + if err != nil { + log.Panicf("getting SA: %v", err) + } +} + +func main() { + var env envConfig + if err := envconfig.Process("", &env); err != nil { + log.Fatalf("failed to process env var: %s", err) + } + log.Printf("env: %+v", env) + log.Printf("location: %s", location) + log.Printf("sa: %s", sa) + + c, err := cloudevents.NewClientHTTP(cloudevents.WithPort(env.Port), + // We need to infuse the request onto context, so we can + // authenticate requests. + cehttp.WithRequestDataAtContextMiddleware()) + if err != nil { + log.Fatalf("failed to create client, %v", err) + } + ctx := context.Background() + + // Construct a verifier that ensures tokens are issued by the Chainguard + // issuer we expect and are intended for a customer webhook. + provider, err := oidc.NewProvider(ctx, env.Issuer) + if err != nil { + log.Fatalf("failed to create provider: %v", err) + } + verifier := provider.Verifier(&oidc.Config{ + ClientID: "customer", + }) + + receiver := func(ctx context.Context, event cloudevents.Event) error { + // We expect Chainguard webhooks to pass an Authorization header. + auth := strings.TrimPrefix(cehttp.RequestDataFromContext(ctx).Header.Get("Authorization"), "Bearer ") + if auth == "" { + return cloudevents.NewHTTPResult(http.StatusUnauthorized, "Unauthorized") + } + + // Verify that the token is well-formed, and in fact intended for us! + if tok, err := verifier.Verify(ctx, auth); err != nil { + return cloudevents.NewHTTPResult(http.StatusForbidden, "unable to verify token: %w", err) + } else if !strings.HasPrefix(tok.Subject, "webhook:") { + return cloudevents.NewHTTPResult(http.StatusForbidden, "subject should be from the Chainguard webhook component, got: %s", tok.Subject) + } else if group := strings.TrimPrefix(tok.Subject, "webhook:"); group != env.Group { + return cloudevents.NewHTTPResult(http.StatusForbidden, "this token is intended for %s, wanted one for %s", group, env.Group) + } + + // We are handling a specific event type, so filter the rest. + if event.Type() != PushEventType { + return nil + } + + data := Occurrence{} + if err := event.DataAs(&data); err != nil { + return cloudevents.NewHTTPResult(http.StatusInternalServerError, "unable to unmarshal data: %w", err) + } + + log.Printf("got event: %+v", data) + + src := "cgr.dev/" + data.Body.Repository + dst := env.DstRepo + if err := crane.Copy(src, dst, + crane.WithAuthFromKeychain(authn.NewMultiKeychain( + google.Keychain, + cgKeychain{env.Issuer, env.Identity}, + ))); err != nil { + return fmt.Errorf("copying image: %w", err) + } + + return nil + } + + if err := c.StartReceiver(ctx, func(ctx context.Context, event cloudevents.Event) error { + // This thunk simply wraps the main receiver in one that logs any errors + // we encounter. + err := receiver(ctx, event) + if err != nil { + log.Printf("SAW: %v", err) + } + return err + }); err != nil { + log.Fatal(err) + } +} + +type cgKeychain struct { + issuer, identity string +} + +func (k cgKeychain) Resolve(res authn.Resource) (authn.Authenticator, error) { + if res.RegistryStr() != "cgr.dev" { + return authn.Anonymous, nil + } + + url := fmt.Sprintf("%s/sts/exchange?aud=%s&identity=%s", k.issuer, res.RegistryStr(), k.identity) + req, err := http.NewRequest(http.MethodPost, url, nil) + if err != nil { + return nil, err + } + client, err := idtoken.NewClient(context.Background(), k.issuer) + if err != nil { + return nil, err + } + resp, err := client.Do(req) + if err != nil { + return nil, err + } + defer resp.Body.Close() + all, _ := io.ReadAll(resp.Body) + if resp.StatusCode != http.StatusOK { + return nil, fmt.Errorf("got HTTP %d to /sts/exchange: %s", resp.StatusCode, all) + } + return &authn.Basic{ + Username: "", + Password: string(all), + }, nil +} diff --git a/image-copy/go.mod b/image-copy/go.mod new file mode 100644 index 0000000..c7ff10a --- /dev/null +++ b/image-copy/go.mod @@ -0,0 +1,53 @@ +module github.com/imjasonh/terraform-playground/image-copy + +go 1.20 + +require ( + cloud.google.com/go/compute/metadata v0.2.3 + github.com/cloudevents/sdk-go/v2 v2.13.0 + github.com/coreos/go-oidc/v3 v3.5.0 + github.com/google/go-containerregistry v0.14.0 + github.com/kelseyhightower/envconfig v1.4.0 + golang.org/x/oauth2 v0.6.0 + google.golang.org/api v0.108.0 +) + +require ( + cloud.google.com/go/compute v1.18.0 // indirect + github.com/containerd/stargz-snapshotter/estargz v0.14.3 // indirect + github.com/docker/cli v23.0.1+incompatible // indirect + github.com/docker/distribution v2.8.1+incompatible // indirect + github.com/docker/docker v23.0.1+incompatible // indirect + github.com/docker/docker-credential-helpers v0.7.0 // indirect + github.com/go-jose/go-jose/v3 v3.0.0 // indirect + github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.2.1 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/klauspost/compress v1.16.0 // indirect + github.com/mitchellh/go-homedir v1.1.0 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.1.0-rc2 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/sirupsen/logrus v1.9.0 // indirect + github.com/vbatts/tar-split v0.11.2 // indirect + go.opencensus.io v0.24.0 // indirect + go.uber.org/atomic v1.9.0 // indirect + go.uber.org/goleak v1.1.12 // indirect + go.uber.org/multierr v1.7.0 // indirect + go.uber.org/zap v1.21.0 // indirect + golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect + golang.org/x/net v0.8.0 // indirect + golang.org/x/sync v0.1.0 // indirect + golang.org/x/sys v0.6.0 // indirect + golang.org/x/text v0.8.0 // indirect + golang.org/x/time v0.0.0-20220609170525-579cf78fd858 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/genproto v0.0.0-20230124163310-31e0e69b6fc2 // indirect + google.golang.org/grpc v1.51.0 // indirect + google.golang.org/protobuf v1.29.0 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect +) diff --git a/image-copy/go.sum b/image-copy/go.sum new file mode 100644 index 0000000..17d6fc8 --- /dev/null +++ b/image-copy/go.sum @@ -0,0 +1,256 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go/compute v1.18.0 h1:FEigFqoDbys2cvFkZ9Fjq4gnHBP55anJ0yQyau2f9oY= +cloud.google.com/go/compute v1.18.0/go.mod h1:1X7yHxec2Ga+Ss6jPyjxRxpu2uu7PLgsOVXvgU0yacs= +cloud.google.com/go/compute/metadata 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+REPO_ROOT_DIR=$PWD/$(dirname "$0")/.. + +echo === Tidying up for Golang +go mod tidy -compat=1.17 + +echo === Generating for Golang +go generate ./... + +# Make sure our dependencies are up-to-date +${REPO_ROOT_DIR}/hack/update-deps.sh diff --git a/image-copy/hack/update-deps.sh b/image-copy/hack/update-deps.sh new file mode 100755 index 0000000..eab9bb8 --- /dev/null +++ b/image-copy/hack/update-deps.sh @@ -0,0 +1,14 @@ +#!/usr/bin/env bash + +# Copyright 2022 Chainguard, Inc. +# SPDX-License-Identifier: Apache-2.0 + +set -o errexit +set -o nounset +set -o pipefail + +REPO_ROOT_DIR=$(dirname "$0")/.. +pushd ${REPO_ROOT_DIR} + +echo === Update Deps for Golang +go mod tidy -compat=1.17 diff --git a/image-copy/iac/main.tf b/image-copy/iac/main.tf new file mode 100644 index 0000000..842fff5 --- /dev/null +++ b/image-copy/iac/main.tf @@ -0,0 +1,115 @@ +terraform { + required_providers { + ko = { + source = "ko-build/ko" + } + google = { + source = "hashicorp/google" + } + chainguard = { + source = "chainguard/chainguard" + } + } +} + +provider "google" { + project = var.project_id +} + +resource "google_service_account" "image-copy" { + account_id = "${var.name}-image-copy" +} + +resource "ko_build" "image" { + importpath = "github.com/imjasonh/terraform-playground/image-copy/cmd/app" + working_dir = path.module +} + +resource "google_cloud_run_service" "image-copy" { + name = "${var.name}-image-copy" + location = var.location + + template { + spec { + service_account_name = google_service_account.image-copy.email + containers { + image = ko_build.image.image_ref + env { + name = "ISSUER_URL" + value = "https://issuer.${var.env}" + } + env { + name = "GROUP" + value = var.group + } + env { + name = "IDENTITY" + value = chainguard_identity.puller-identity.id + } + env { + name = "DST_REPO" + value = "${var.location}-docker.pkg.dev/${var.project_id}/${var.dst_repo}" + } + } + } + } +} + +data "google_iam_policy" "noauth" { + binding { + role = "roles/run.invoker" + members = [ + "allUsers", + ] + } +} + +resource "google_cloud_run_service_iam_policy" "noauth" { + location = google_cloud_run_service.image-copy.location + service = google_cloud_run_service.image-copy.name + + policy_data = data.google_iam_policy.noauth.policy_data +} + +resource "google_artifact_registry_repository" "dst-repo" { + location = var.location + repository_id = var.dst_repo + description = "image-copy repository" + format = "DOCKER" +} + +resource "google_artifact_registry_repository_iam_member" "member" { + location = google_artifact_registry_repository.dst-repo.location + repository = google_artifact_registry_repository.dst-repo.name + role = "roles/artifactregistry.writer" + member = "serviceAccount:${google_service_account.image-copy.email}" +} + +# Create the identity for our Cloud Run service to assume. +resource "chainguard_identity" "puller-identity" { + parent_id = var.group + name = "image-copy cgr puller" + + claim_match { + issuer = "https://accounts.google.com" + subject = google_service_account.image-copy.unique_id + } +} + +# Look up the registry.pull role to grant the identity. +data "chainguard_roles" "puller" { + name = "registry.pull" +} + +# Grant the identity the "registry.pull" role on the root group. +resource "chainguard_rolebinding" "puller" { + identity = chainguard_identity.puller-identity.id + group = var.group + role = data.chainguard_roles.puller.items[0].id +} + +# Create a subscription to notify the Cloud Run service on changes under the root group. +resource "chainguard_subscription" "subscription" { + parent_id = var.group + sink = google_cloud_run_service.image-copy.status[0].url +} diff --git a/image-copy/iac/outputs.tf b/image-copy/iac/outputs.tf new file mode 100644 index 0000000..3b0fd0b --- /dev/null +++ b/image-copy/iac/outputs.tf @@ -0,0 +1,3 @@ +output "url" { + value = google_cloud_run_service.image-copy.status[0].url +} diff --git a/image-copy/iac/terraform.tfvars b/image-copy/iac/terraform.tfvars new file mode 100644 index 0000000..d8061b9 --- /dev/null +++ b/image-copy/iac/terraform.tfvars @@ -0,0 +1,4 @@ +name = "chainguard-dev" +project_id = "jason-chainguard" +group = "7bf08061e47a927f78ffa39cd6393f4a83ec6eb7" +dst_repo = "image-copy" diff --git a/image-copy/iac/variables.tf b/image-copy/iac/variables.tf new file mode 100644 index 0000000..fa7b732 --- /dev/null +++ b/image-copy/iac/variables.tf @@ -0,0 +1,30 @@ +variable "name" { + description = "Name to prefix to created resources." +} + +variable "project_id" { + type = string + description = "The project that will host this solution." +} + +variable "location" { + type = string + default = "us-central1" + description = "Where to run the Cloud Run service." +} + +variable "env" { + type = string + default = "enforce.dev" + description = "The Chainguard environment against which this solution is configured." +} + +variable "group" { + type = string + description = "The Chainguard group that we are subscribing to policy violations under." +} + +variable "dst_repo" { + type = string + description = "The destination repo where images should be copied to." +}