initial oidc change

.drone.yml

@@ -5,6 +5,7 @@ name: default
 pool:
   use: ubuntu
 
+
 platform:
   os: linux
   arch: amd64

README.md

@@ -44,6 +44,11 @@ docker build \
   --label org.label-schema.build-date=$(date -u +"%Y-%m-%dT%H:%M:%SZ") \
   --label org.label-schema.vcs-ref=$(git rev-parse --short HEAD) \
   --file docker/ecr/Dockerfile.linux.amd64 --tag plugins/kaniko-ecr .
+  
+  docker build \
+  --label org.label-schema.build-date=$(date -u +"%Y-%m-%dT%H:%M:%SZ") \
+  --label org.label-schema.vcs-ref=$(git rev-parse --short HEAD) \
+  --file docker/gar/Dockerfile.linux.amd64 --tag plugins/kaniko-gar .
 ```
 
 ## Usage

cmd/kaniko-gar/main.go

@@ -1,10 +1,14 @@
 package main
 
 import (
+	"encoding/base64"
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"os"
 
+	"github.com/drone/drone-kaniko/internal"
+
 	"github.com/joho/godotenv"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -164,6 +168,31 @@ func main() {
 			Usage:  "build only used stages",
 			EnvVar: "PLUGIN_SKIP_UNUSED_STAGES",
 		},
+		cli.StringFlag{
+			Name:   "oidc-token",
+			Usage:  "OIDC token to use for authentication",
+			EnvVar: "PLUGIN_OIDC_TOKEN_ID",
+		},
+		cli.StringFlag{
+			Name:   "project-number",
+			Usage:  "Google project number",
+			EnvVar: "PLUGIN_PROJECT_NUMBER",
+		},
+		cli.StringFlag{
+			Name:   "pool-id",
+			Usage:  "Google pool id",
+			EnvVar: "PLUGIN_POOL_ID",
+		},
+		cli.StringFlag{
+			Name:   "provider-id",
+			Usage:  "Google provider id",
+			EnvVar: "PLUGIN_PROVIDER_ID",
+		},
+		cli.StringFlag{
+			Name:   "service-account-email",
+			Usage:  "Google service account email",
+			EnvVar: "PLUGIN_SERVICE_ACCOUNT_EMAIL",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {
@@ -174,7 +203,12 @@ func main() {
 func run(c *cli.Context) error {
 	noPush := c.Bool("no-push")
 	jsonKey := c.String("json-key")
-
+	idToken := c.String("oidc-token")
+	projectNumber := c.String("project-number")
+	poolId := c.String("pool-id")
+	providerId := c.String("provider-id")
+	serviceAccountEmail := c.String("service-account-email")
+	registry := c.String("registry")
 	// JSON key may not be set in the following cases:
 	// 1. Image does not need to be pushed to GAR.
 	// 2. Workload identity is set on GKE in which pod will inherit the credentials via service account.
@@ -182,6 +216,13 @@ func run(c *cli.Context) error {
 		if err := setupGARAuth(jsonKey); err != nil {
 			return err
 		}
+	} else if idToken != "" {
+		accessToken := setupOIDCAuth(idToken, projectNumber, poolId, providerId, serviceAccountEmail)
+		if accessToken != "" {
+			if err := setupAccessTokenAuth(accessToken, registry); err != nil {
+				return err
+			}
+		}
 	}
 
 	plugin := kaniko.Plugin{
@@ -212,7 +253,7 @@ func run(c *cli.Context) error {
 		Artifact: kaniko.Artifact{
 			Tags:         c.StringSlice("tags"),
 			Repo:         c.String("repo"),
-			Registry:     c.String("registry"),
+			Registry:     registry,
 			ArtifactFile: c.String("artifact-file"),
 			RegistryType: artifact.GAR,
 		},
@@ -232,3 +273,41 @@ func setupGARAuth(jsonKey string) error {
 	}
 	return nil
 }
+
+func setupAccessTokenAuth(accessToken, registryURL string) error {
+	dockerConfig := map[string]interface{}{
+		"auths": map[string]interface{}{
+			registryURL: map[string]string{
+				"auth": encodeAccessToken(accessToken),
+			},
+		},
+	}
+
+	dockerConfigJson, err := json.Marshal(dockerConfig)
+	if err != nil {
+		return fmt.Errorf("failed to marshal docker config: %w", err)
+	}
+
+	if err := ioutil.WriteFile("/root/.docker/config.json", dockerConfigJson, 0600); err != nil {
+		return fmt.Errorf("failed to write docker config file: %w", err)
+	}
+
+	return nil
+}
+
+func encodeAccessToken(token string) string {
+	auth := base64.StdEncoding.EncodeToString([]byte("_json_key:" + token))
+	return auth
+}
+
+func setupOIDCAuth(idToken, projectId, poolId, providerId, serviceAccountEmail string) string {
+	federalToken, err := internal.GetFederalToken(idToken, projectId, poolId, providerId)
+	if err != nil {
+		logrus.Fatalf("Error (getFederalToken): %s", err)
+	}
+	accessToken, err := internal.GetGoogleCloudAccessToken(federalToken, serviceAccountEmail)
+	if err != nil {
+		logrus.Fatalf("Error (getGoogleCloudAccessToken): %s", err)
+	}
+	return accessToken
+}

go.mod

@@ -10,16 +10,18 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/ecrpublic v1.13.8
 	github.com/aws/smithy-go v1.12.0
 	github.com/coreos/go-semver v0.3.0
-	github.com/google/go-cmp v0.5.8
+	github.com/google/go-cmp v0.6.0
 	github.com/hashicorp/go-version v1.6.0
 	github.com/joho/godotenv v1.4.0
 	github.com/pkg/errors v0.9.1
 	github.com/sirupsen/logrus v1.8.1
 	github.com/urfave/cli v1.22.9
-	golang.org/x/mod v0.5.1
+	golang.org/x/mod v0.8.0
 )
 
 require (
+	cloud.google.com/go/compute v1.23.1 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.0.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v0.5.3 // indirect
 	github.com/aws/aws-sdk-go-v2/credentials v1.12.9 // indirect
@@ -32,15 +34,27 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/sts v1.16.9 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
-	github.com/google/uuid v1.3.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/s2a-go v0.1.7 // indirect
+	github.com/google/uuid v1.4.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa // indirect
-	golang.org/x/net v0.0.0-20220725212005-46097bf591d3 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	golang.org/x/text v0.3.7 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/oauth2 v0.13.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	google.golang.org/api v0.151.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405 // indirect
+	google.golang.org/grpc v1.59.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 )
 
 go 1.21

go.sum

@@ -1,3 +1,8 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go/compute v1.23.1 h1:V97tBoDaZHb6leicZ1G6DLK2BAaZLJ/7+9BB/En3hR0=
+cloud.google.com/go/compute v1.23.1/go.mod h1:CqB3xpmPKKt3OJpW2ndFIXnA9A4xAy/F3Xp1ixncW78=
+cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
+cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.1.1 h1:tz19qLF65vuu2ibfTqGVJxG/zZAI27NEIIbvAOQwYbw=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.1.1/go.mod h1:uGG2W01BaETf0Ozp+QxxKJdMBNRWPdstHG0Fmdwn1/U=
 github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.1.0 h1:QkAcEIAKbNL4KoFr4SathZPhDhF4mVwpBMFlYjyAqy8=
@@ -35,6 +40,9 @@ github.com/aws/aws-sdk-go-v2/service/sts v1.16.9 h1:yOfILxyjmtr2ubRkRJldlHDFBhf5
 github.com/aws/aws-sdk-go-v2/service/sts v1.16.9/go.mod h1:O1IvkYxr+39hRf960Us6j0x1P8pDqhTX+oXM5kQNl/Y=
 github.com/aws/smithy-go v1.12.0 h1:gXpeZel/jPoWQ7OEmLIgCUnhkFftqNfwWUwAHSlp1v0=
 github.com/aws/smithy-go v1.12.0/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J3gBHzA=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
@@ -45,16 +53,55 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dnaeon/go-vcr v1.1.0 h1:ReYa/UBrRyQdant9B4fNHGoCNKw6qh6P0fsdGmZpR7c=
 github.com/dnaeon/go-vcr v1.1.0/go.mod h1:M7tiix8f0r6mKKJ3Yq/kqU1OYf3MnfmBWVbPx/yU9ko=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/golang-jwt/jwt v3.2.1+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY=
 github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/golang-jwt/jwt/v4 v4.2.0 h1:besgBTC8w8HjP6NzQdxwKH9Z5oQMZ24ThTrHp3cZ8eU=
 github.com/golang-jwt/jwt/v4 v4.2.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+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/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
+github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
+github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
+github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
+github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
+github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/s2a-go v0.1.7 h1:60BLSyTrOV4/haCDW4zb1guZItoSq8foHCXrAnjBo/o=
+github.com/google/s2a-go v0.1.7/go.mod h1:50CgR4k1jNlWBu4UfS4AcfhVe1r6pdZPygJ3R8F0Qdw=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.4.0 h1:MtMxsa51/r9yyhkyLsVeVt0B+BGQZzpQiTQ4eHZ8bc4=
+github.com/google/uuid v1.4.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/googleapis/enterprise-certificate-proxy v0.3.2 h1:Vie5ybvEvT75RniqhfFxPRy3Bf7vr3h0cechB90XaQs=
+github.com/googleapis/enterprise-certificate-proxy v0.3.2/go.mod h1:VLSiSSBs/ksPL8kq3OBOQ6WRI2QnaFynd1DCjZ62+V0=
+github.com/googleapis/gax-go/v2 v2.12.0 h1:A+gCJKdRfqXkr+BIRGtZLibNXf0m1f9E4HG56etFpas=
+github.com/googleapis/gax-go/v2 v2.12.0/go.mod h1:y+aIqrI5eb1YGMVJfuV3185Ts/D7qKpsEkdD5+I6QGU=
 github.com/hashicorp/go-version v1.6.0 h1:feTTfFNnjP967rlCxM/I9g701jU+RN74YKx2mOkIeek=
 github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
@@ -73,6 +120,7 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
@@ -80,33 +128,117 @@ github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeV
 github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
 github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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internal/tokenutil.go

@@ -0,0 +1,65 @@
+package internal
+
+import (
+	"context"
+	"fmt"
+
+	"golang.org/x/oauth2"
+	"google.golang.org/api/iamcredentials/v1"
+	"google.golang.org/api/option"
+	"google.golang.org/api/sts/v1"
+)
+
+type staticTokenSource struct {
+	token *oauth2.Token
+}
+
+func (s *staticTokenSource) Token() (*oauth2.Token, error) {
+	return s.token, nil
+}
+
+func GetFederalToken(idToken, projectNumber, poolId, providerId string) (string, error) {
+	ctx := context.Background()
+	stsService, err := sts.NewService(ctx, option.WithoutAuthentication())
+	if err != nil {
+		return "", err
+	}
+	audience := fmt.Sprintf("//iam.googleapis.com/projects/%s/locations/global/workloadIdentityPools/%s/providers/%s", projectNumber, poolId, providerId)
+	tokenRequest := &sts.GoogleIdentityStsV1ExchangeTokenRequest{
+		GrantType:          "urn:ietf:params:oauth:grant-type:token-exchange",
+		SubjectToken:       idToken,
+		Audience:           audience,
+		Scope:              "https://www.googleapis.com/auth/cloud-platform",
+		RequestedTokenType: "urn:ietf:params:oauth:token-type:access_token",
+		SubjectTokenType:   "urn:ietf:params:oauth:token-type:id_token",
+	}
+	tokenResponse, err := stsService.V1.Token(tokenRequest).Do()
+	if err != nil {
+		return "", err
+	}
+
+	return tokenResponse.AccessToken, nil
+}
+
+func GetGoogleCloudAccessToken(federatedToken string, serviceAccountEmail string) (string, error) {
+	ctx := context.Background()
+	tokenSource := &staticTokenSource{
+		token: &oauth2.Token{AccessToken: federatedToken},
+	}
+	service, err := iamcredentials.NewService(ctx, option.WithTokenSource(tokenSource))
+	if err != nil {
+		return "", err
+	}
+
+	name := "projects/-/serviceAccounts/" + serviceAccountEmail
+	rb := &iamcredentials.GenerateAccessTokenRequest{
+		Scope: []string{"https://www.googleapis.com/auth/cloud-platform"},
+	}
+
+	resp, err := service.Projects.ServiceAccounts.GenerateAccessToken(name, rb).Do()
+	if err != nil {
+		return "", err
+	}
+
+	return resp.AccessToken, nil
+}

kaniko.go

@@ -49,6 +49,7 @@ type (
 		Registry     string                    // Docker artifact registry
 		RegistryType artifact.RegistryTypeEnum // Rocker artifact registry type
 		ArtifactFile string                    // Artifact file location
+		AccessToken  string                    // Access token for registry
 	}
 
 	// Output defines content of output file
@@ -224,7 +225,7 @@ func (p Plugin) Exec() error {
 	if p.Build.TarPath != "" {
 		cmdArgs = append(cmdArgs, fmt.Sprintf("--tar-path=%s", p.Build.TarPath))
 	}
-	
+
 	cmd := exec.Command("/kaniko/executor", cmdArgs...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr