[RFC-0010] Introduce KMS provider decryption with service account

Signed-off-by: Matheus Pimenta <matheuscscp@gmail.com>

Author: matheuscscp

api/v1/kustomization_types.go

@@ -205,7 +205,18 @@ type Decryption struct {
 	// +required
 	Provider string `json:"provider"`
 
+	// ServiceAccountName is the name of the service account used to
+	// authenticate with KMS services from cloud providers. If a
+	// static credential for a given cloud provider is defined
+	// inside the Secret referenced by SecretRef, that static
+	// credential takes priority.
+	// +optional
+	ServiceAccountName string `json:"serviceAccountName,omitempty"`
+
 	// The secret name containing the private OpenPGP keys used for decryption.
+	// A static credential for a cloud provider defined inside the Secret
+	// takes priority to secret-less authentication with the ServiceAccountName
+	// field.
 	// +optional
 	SecretRef *meta.LocalObjectReference `json:"secretRef,omitempty"`
 }

config/crd/bases/kustomize.toolkit.fluxcd.io_kustomizations.yaml

@@ -86,15 +86,26 @@ spec:
                     - sops
                     type: string
                   secretRef:
-                    description: The secret name containing the private OpenPGP keys
-                      used for decryption.
+                    description: |-
+                      The secret name containing the private OpenPGP keys used for decryption.
+                      A static credential for a cloud provider defined inside the Secret
+                      takes priority to secret-less authentication with the ServiceAccountName
+                      field.
                     properties:
                       name:
                         description: Name of the referent.
                         type: string
                     required:
                     - name
                     type: object
+                  serviceAccountName:
+                    description: |-
+                      ServiceAccountName is the name of the service account used to
+                      authenticate with KMS services from cloud providers. If a
+                      static credential for a given cloud provider is defined
+                      inside the Secret referenced by SecretRef, that static
+                      credential takes priority.
+                    type: string
                 required:
                 - provider
                 type: object

docs/api/v1/kustomize.md

@@ -574,6 +574,22 @@ string
 </tr>
 <tr>
 <td>
+<code>serviceAccountName</code><br>
+<em>
+string
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>ServiceAccountName is the name of the service account used to
+authenticate with KMS services from cloud providers. If a
+static credential for a given cloud provider is defined
+inside the Secret referenced by SecretRef, that static
+credential takes priority.</p>
+</td>
+</tr>
+<tr>
+<td>
 <code>secretRef</code><br>
 <em>
 <a href="https://godoc.org/github.com/fluxcd/pkg/apis/meta#LocalObjectReference">
@@ -583,7 +599,10 @@ github.com/fluxcd/pkg/apis/meta.LocalObjectReference
 </td>
 <td>
 <em>(Optional)</em>
-<p>The secret name containing the private OpenPGP keys used for decryption.</p>
+<p>The secret name containing the private OpenPGP keys used for decryption.
+A static credential for a cloud provider defined inside the Secret
+takes priority to secret-less authentication with the ServiceAccountName
+field.</p>
 </td>
 </tr>
 </tbody>

docs/spec/v1/kustomizations.md

@@ -847,6 +847,15 @@ It has two fields:
 - `.secretRef.name`: The name of the secret that contains the keys to be used for
   decryption. This field can be omitted when using the
   [global decryption](#controller-global-decryption) option.
+- `.serviceAccountName`: The name of the service account used for
+  secret-less authentication with KMS services from cloud providers.
+  If a static credential for a given cloud provider is defined
+  inside the secret referenced by `.secretRef`, that static
+  credential takes priority.
+  The configuration of this service account follows the same structure defined in the
+  [workload identity](/flux/installation/configuration/workload-identity/) documentation.
+  This field allows users to define individual cloud identities for each Kustomization
+  object. It's an alternative to using the cloud identity associated with the controller.
 
 ```yaml
 ---

go.mod

@@ -11,11 +11,13 @@ replace github.com/fluxcd/kustomize-controller/api => ./api
 replace github.com/opencontainers/go-digest => github.com/opencontainers/go-digest v1.0.1-0.20220411205349-bde1400a84be
 
 require (
+	cloud.google.com/go/kms v1.21.1
 	filippo.io/age v1.2.1
 	github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.1
 	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.2
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.65
+	github.com/aws/aws-sdk-go-v2 v1.36.3
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.67
 	github.com/cyphar/filepath-securejoin v0.4.1
 	github.com/dimchansky/utfbom v1.1.1
 	github.com/fluxcd/cli-utils v0.36.0-flux.12
@@ -24,6 +26,8 @@ require (
 	github.com/fluxcd/pkg/apis/event v0.16.0
 	github.com/fluxcd/pkg/apis/kustomize v1.9.0
 	github.com/fluxcd/pkg/apis/meta v1.10.0
+	github.com/fluxcd/pkg/auth v0.9.1-0.20250417205012-6cd2fbf01a6e
+	github.com/fluxcd/pkg/cache v0.7.0
 	github.com/fluxcd/pkg/http/fetch v0.15.0
 	github.com/fluxcd/pkg/kustomize v1.16.0
 	github.com/fluxcd/pkg/runtime v0.58.0
@@ -38,8 +42,9 @@ require (
 	github.com/ory/dockertest/v3 v3.11.0
 	github.com/spf13/pflag v1.0.6
 	golang.org/x/net v0.38.0
-	k8s.io/api v0.32.2
-	k8s.io/apimachinery v0.32.2
+	golang.org/x/oauth2 v0.28.0
+	k8s.io/api v0.32.3
+	k8s.io/apimachinery v0.32.3
 	k8s.io/client-go v0.32.2
 	k8s.io/utils v0.0.0-20241210054802-24370beab758
 	sigs.k8s.io/controller-runtime v0.20.4
@@ -63,7 +68,6 @@ require (
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.6.0 // indirect
 	cloud.google.com/go/iam v1.4.2 // indirect
-	cloud.google.com/go/kms v1.21.1 // indirect
 	cloud.google.com/go/longrunning v0.6.6 // indirect
 	cloud.google.com/go/monitoring v1.24.1 // indirect
 	cloud.google.com/go/storage v1.51.0 // indirect
@@ -82,24 +86,24 @@ require (
 	github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect
 	github.com/ProtonMail/go-crypto v1.1.6 // indirect
 	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
-	github.com/aws/aws-sdk-go-v2 v1.36.3 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.10 // indirect
-	github.com/aws/aws-sdk-go-v2/config v1.29.12 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.29.14 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.30 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.17.69 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.34 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.34 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.3 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.34 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ecr v1.43.3 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.3 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.7.0 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.15 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.18.15 // indirect
 	github.com/aws/aws-sdk-go-v2/service/kms v1.38.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.78.2 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.25.2 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.0 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.33.17 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.25.3 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.19 // indirect
 	github.com/aws/smithy-go v1.22.3 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/blang/semver v3.5.1+incompatible // indirect
@@ -225,7 +229,6 @@ require (
 	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/crypto v0.36.0 // indirect
 	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 // indirect
-	golang.org/x/oauth2 v0.28.0 // indirect
 	golang.org/x/sync v0.12.0 // indirect
 	golang.org/x/sys v0.31.0 // indirect
 	golang.org/x/term v0.30.0 // indirect

go.sum

@@ -75,10 +75,10 @@ github.com/aws/aws-sdk-go-v2 v1.36.3 h1:mJoei2CxPutQVxaATCzDUjcZEjVRdpsiiXi2o38y
 github.com/aws/aws-sdk-go-v2 v1.36.3/go.mod h1:LLXuLpgzEbD766Z5ECcRmi8AzSwfZItDtmABVkRLGzg=
 github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.10 h1:zAybnyUQXIZ5mok5Jqwlf58/TFE7uvd3IAsa1aF9cXs=
 github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.10/go.mod h1:qqvMj6gHLR/EXWZw4ZbqlPbQUyenf4h82UQUlKc+l14=
-github.com/aws/aws-sdk-go-v2/config v1.29.12 h1:Y/2a+jLPrPbHpFkpAAYkVEtJmxORlXoo5k2g1fa2sUo=
-github.com/aws/aws-sdk-go-v2/config v1.29.12/go.mod h1:xse1YTjmORlb/6fhkWi8qJh3cvZi4JoVNhc+NbJt4kI=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.65 h1:q+nV2yYegofO/SUXruT+pn4KxkxmaQ++1B/QedcKBFM=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.65/go.mod h1:4zyjAuGOdikpNYiSGpsGz8hLGmUzlY8pc8r9QQ/RXYQ=
+github.com/aws/aws-sdk-go-v2/config v1.29.14 h1:f+eEi/2cKCg9pqKBoAIwRGzVb70MRKqWX4dg1BDcSJM=
+github.com/aws/aws-sdk-go-v2/config v1.29.14/go.mod h1:wVPHWcIFv3WO89w0rE10gzf17ZYy+UVS1Geq8Iei34g=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.67 h1:9KxtdcIA/5xPNQyZRgUSpYOE6j9Bc4+D7nZua0KGYOM=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.67/go.mod h1:p3C44m+cfnbv763s52gCqrjaqyPikj9Sg47kUVaNZQQ=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.30 h1:x793wxmUWVDhshP8WW2mlnXuFrO4cOd3HLBroh1paFw=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.30/go.mod h1:Jpne2tDnYiFascUEs2AWHJL9Yp7A5ZVy3TNyxaAjD6M=
 github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.17.69 h1:6VFPH/Zi9xYFMJKPQOX5URYkQoXRWeJ7V/7Y6ZDYoms=
@@ -91,6 +91,8 @@ github.com/aws/aws-sdk-go-v2/internal/ini v1.8.3 h1:bIqFDwgGXXN1Kpp99pDOdKMTTb5d
 github.com/aws/aws-sdk-go-v2/internal/ini v1.8.3/go.mod h1:H5O/EsxDWyU+LP/V8i5sm8cxoZgc2fdNR9bxlOFrQTo=
 github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.34 h1:ZNTqv4nIdE/DiBfUUfXcLZ/Spcuz+RjeziUtNJackkM=
 github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.34/go.mod h1:zf7Vcd1ViW7cPqYWEHLHJkS50X0JS2IKz9Cgaj6ugrs=
+github.com/aws/aws-sdk-go-v2/service/ecr v1.43.3 h1:YyH8Hk73bYzdbvf6S8NF5z/fb/1stpiMnFSfL6jSfRA=
+github.com/aws/aws-sdk-go-v2/service/ecr v1.43.3/go.mod h1:iQ1skgw1XRK+6Lgkb0I9ODatAP72WoTILh0zXQ5DtbU=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.3 h1:eAh2A4b5IzM/lum78bZ590jy36+d/aFLgKF/4Vd1xPE=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.3/go.mod h1:0yKJC/kb8sAnmlYa6Zs3QVYqaC8ug2AbnNChv5Ox3uA=
 github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.7.0 h1:lguz0bmOoGzozP9XfRJR1QIayEYo+2vP/No3OfLF0pU=
@@ -103,12 +105,12 @@ github.com/aws/aws-sdk-go-v2/service/kms v1.38.1 h1:tecq7+mAav5byF+Mr+iONJnCBf4B
 github.com/aws/aws-sdk-go-v2/service/kms v1.38.1/go.mod h1:cQn6tAF77Di6m4huxovNM7NVAozWTZLsDRp9t8Z/WYk=
 github.com/aws/aws-sdk-go-v2/service/s3 v1.78.2 h1:jIiopHEV22b4yQP2q36Y0OmwLbsxNWdWwfZRR5QRRO4=
 github.com/aws/aws-sdk-go-v2/service/s3 v1.78.2/go.mod h1:U5SNqwhXB3Xe6F47kXvWihPl/ilGaEDe8HD/50Z9wxc=
-github.com/aws/aws-sdk-go-v2/service/sso v1.25.2 h1:pdgODsAhGo4dvzC3JAG5Ce0PX8kWXrTZGx+jxADD+5E=
-github.com/aws/aws-sdk-go-v2/service/sso v1.25.2/go.mod h1:qs4a9T5EMLl/Cajiw2TcbNt2UNo/Hqlyp+GiuG4CFDI=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.0 h1:90uX0veLKcdHVfvxhkWUQSCi5VabtwMLFutYiRke4oo=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.0/go.mod h1:MlYRNmYu/fGPoxBQVvBYr9nyr948aY/WLUvwBMBJubs=
-github.com/aws/aws-sdk-go-v2/service/sts v1.33.17 h1:PZV5W8yk4OtH1JAuhV2PXwwO9v5G5Aoj+eMCn4T+1Kc=
-github.com/aws/aws-sdk-go-v2/service/sts v1.33.17/go.mod h1:cQnB8CUnxbMU82JvlqjKR2HBOm3fe9pWorWBza6MBJ4=
+github.com/aws/aws-sdk-go-v2/service/sso v1.25.3 h1:1Gw+9ajCV1jogloEv1RRnvfRFia2cL6c9cuKV2Ps+G8=
+github.com/aws/aws-sdk-go-v2/service/sso v1.25.3/go.mod h1:qs4a9T5EMLl/Cajiw2TcbNt2UNo/Hqlyp+GiuG4CFDI=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.1 h1:hXmVKytPfTy5axZ+fYbR5d0cFmC3JvwLm5kM83luako=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.30.1/go.mod h1:MlYRNmYu/fGPoxBQVvBYr9nyr948aY/WLUvwBMBJubs=
+github.com/aws/aws-sdk-go-v2/service/sts v1.33.19 h1:1XuUZ8mYJw9B6lzAkXhqHlJd/XvaX32evhproijJEZY=
+github.com/aws/aws-sdk-go-v2/service/sts v1.33.19/go.mod h1:cQnB8CUnxbMU82JvlqjKR2HBOm3fe9pWorWBza6MBJ4=
 github.com/aws/smithy-go v1.22.3 h1:Z//5NuZCSW6R4PhQ93hShNbyBbn8BWCmCVCt+Q8Io5k=
 github.com/aws/smithy-go v1.22.3/go.mod h1:t1ufH5HMublsJYulve2RKmHDC15xu1f26kHCp/HgceI=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -129,6 +131,8 @@ github.com/cncf/xds/go v0.0.0-20250326154945-ae57f3c0d45f h1:C5bqEmzEPLsHm9Mv73l
 github.com/cncf/xds/go v0.0.0-20250326154945-ae57f3c0d45f/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
 github.com/containerd/continuity v0.4.5 h1:ZRoN1sXq9u7V6QoHMcVWGhOwDFqZ4B9i5H6un1Wh0x4=
 github.com/containerd/continuity v0.4.5/go.mod h1:/lNJvtJKUQStBzpVQ1+rasXO1LAWtUQssk28EZvJ3nE=
+github.com/coreos/go-oidc/v3 v3.14.1 h1:9ePWwfdwC4QKRlCXsJGou56adA/owXczOzwKdOumLqk=
+github.com/coreos/go-oidc/v3 v3.14.1/go.mod h1:HaZ3szPaZ0e4r6ebqvsLWlk2Tn+aejfmrfah6hnSYEU=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/cpuguy83/go-md2man/v2 v2.0.6 h1:XJtiaUW6dEEqVuZiMTn1ldk455QWwEIsMIJlo5vtkx0=
@@ -183,6 +187,10 @@ github.com/fluxcd/pkg/apis/kustomize v1.9.0 h1:SJpT1CK58AnTvCpDKeGfMNA0Xud/4VReZ
 github.com/fluxcd/pkg/apis/kustomize v1.9.0/go.mod h1:AZl2GU03oPVue6SUivdiIYd/3mvF94j7t1G2JO26d4s=
 github.com/fluxcd/pkg/apis/meta v1.10.0 h1:rqbAuyl5ug7A5jjRf/rNwBXmNl6tJ9wG2iIsriwnQUk=
 github.com/fluxcd/pkg/apis/meta v1.10.0/go.mod h1:n7NstXHDaleAUMajcXTVkhz0MYkvEXy1C/eLI/t1xoI=
+github.com/fluxcd/pkg/auth v0.9.1-0.20250417205012-6cd2fbf01a6e h1:sEg38mTa4+G5LEfE8AvrnQHiFcC7BjUifs1Knv/H/+U=
+github.com/fluxcd/pkg/auth v0.9.1-0.20250417205012-6cd2fbf01a6e/go.mod h1:Z+k3+eoqwCYjpIhmLPlhVrsaqPI2ngjSSAvWEc5nR2s=
+github.com/fluxcd/pkg/cache v0.7.0 h1:6TTWbxCyAxErIAT338KrLTy96ds+vSDw4sEyypSISfs=
+github.com/fluxcd/pkg/cache v0.7.0/go.mod h1:EHpyMSXf/ECKIoKEQmNCOesH2wfAdpmXR/ZXD6VwWRg=
 github.com/fluxcd/pkg/envsubst v1.3.0 h1:84Ain+8EBvyzu6y0FsKRwNsvaSiKuqhTqeh/4yoGFFU=
 github.com/fluxcd/pkg/envsubst v1.3.0/go.mod h1:lz6HvqDnxbX0sIqjr1fxw0oTGYACLVFcOE/srKS0VQQ=
 github.com/fluxcd/pkg/http/fetch v0.15.0 h1:AJ1JuE2asuK4QMfbHjxctFURke5FvZtyljjI1Qv4ArQ=
@@ -555,12 +563,12 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=
 gotest.tools/v3 v3.5.1/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=
-k8s.io/api v0.32.2 h1:bZrMLEkgizC24G9eViHGOPbW+aRo9duEISRIJKfdJuw=
-k8s.io/api v0.32.2/go.mod h1:hKlhk4x1sJyYnHENsrdCWw31FEmCijNGPJO5WzHiJ6Y=
+k8s.io/api v0.32.3 h1:Hw7KqxRusq+6QSplE3NYG4MBxZw1BZnq4aP4cJVINls=
+k8s.io/api v0.32.3/go.mod h1:2wEDTXADtm/HA7CCMD8D8bK4yuBUptzaRhYcYEEYA3k=
 k8s.io/apiextensions-apiserver v0.32.2 h1:2YMk285jWMk2188V2AERy5yDwBYrjgWYggscghPCvV4=
 k8s.io/apiextensions-apiserver v0.32.2/go.mod h1:GPwf8sph7YlJT3H6aKUWtd0E+oyShk/YHWQHf/OOgCA=
-k8s.io/apimachinery v0.32.2 h1:yoQBR9ZGkA6Rgmhbp/yuT9/g+4lxtsGYwW6dR6BDPLQ=
-k8s.io/apimachinery v0.32.2/go.mod h1:GpHVgxoKlTxClKcteaeuF1Ul/lDVb74KpZcxcmLDElE=
+k8s.io/apimachinery v0.32.3 h1:JmDuDarhDmA/Li7j3aPrwhpNBA94Nvk5zLeOge9HH1U=
+k8s.io/apimachinery v0.32.3/go.mod h1:GpHVgxoKlTxClKcteaeuF1Ul/lDVb74KpZcxcmLDElE=
 k8s.io/cli-runtime v0.32.2 h1:aKQR4foh9qeyckKRkNXUccP9moxzffyndZAvr+IXMks=
 k8s.io/cli-runtime v0.32.2/go.mod h1:a/JpeMztz3xDa7GCyyShcwe55p8pbcCVQxvqZnIwXN8=
 k8s.io/client-go v0.32.2 h1:4dYCD4Nz+9RApM2b/3BtVvBHw54QjMFUl1OLcJG5yOA=

internal/controller/kustomization_controller.go

@@ -27,8 +27,6 @@ import (
 	"time"
 
 	securejoin "github.com/cyphar/filepath-securejoin"
-	"github.com/fluxcd/pkg/ssa/normalize"
-	ssautil "github.com/fluxcd/pkg/ssa/utils"
 	corev1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	apimeta "k8s.io/apimachinery/pkg/api/meta"
@@ -53,6 +51,7 @@ import (
 	apiacl "github.com/fluxcd/pkg/apis/acl"
 	eventv1 "github.com/fluxcd/pkg/apis/event/v1beta1"
 	"github.com/fluxcd/pkg/apis/meta"
+	"github.com/fluxcd/pkg/cache"
 	"github.com/fluxcd/pkg/http/fetch"
 	generator "github.com/fluxcd/pkg/kustomize"
 	"github.com/fluxcd/pkg/runtime/acl"
@@ -64,6 +63,8 @@ import (
 	"github.com/fluxcd/pkg/runtime/patch"
 	"github.com/fluxcd/pkg/runtime/predicates"
 	"github.com/fluxcd/pkg/ssa"
+	"github.com/fluxcd/pkg/ssa/normalize"
+	ssautil "github.com/fluxcd/pkg/ssa/utils"
 	"github.com/fluxcd/pkg/tar"
 	sourcev1 "github.com/fluxcd/source-controller/api/v1"
 	sourcev1b2 "github.com/fluxcd/source-controller/api/v1beta2"
@@ -104,6 +105,7 @@ type KustomizationReconciler struct {
 	DisallowedFieldManagers []string
 	StrictSubstitutions     bool
 	GroupChangeLog          bool
+	TokenCache              *cache.TokenCache
 }
 
 // KustomizationReconcilerOptions contains options for the KustomizationReconciler.
@@ -615,17 +617,23 @@ func (r *KustomizationReconciler) generate(obj unstructured.Unstructured,
 func (r *KustomizationReconciler) build(ctx context.Context,
 	obj *kustomizev1.Kustomization, u unstructured.Unstructured,
 	workDir, dirPath string) ([]byte, error) {
-	dec, cleanup, err := decryptor.NewTempDecryptor(workDir, r.Client, obj)
+	dec, cleanup, err := decryptor.NewTempDecryptor(workDir, r.Client, obj, r.TokenCache)
 	if err != nil {
 		return nil, err
 	}
 	defer cleanup()
 
-	// Import decryption keys
+	// First, we import decryption keys or cloud provider static
+	// credentials from the secret.
 	if err := dec.ImportKeys(ctx); err != nil {
 		return nil, err
 	}
 
+	// Then we set the secret-less authentication options for the
+	// cloud providers that do not have static credentials after
+	// importing the keys.
+	dec.SetAuthOptions(ctx)
+
 	// Decrypt Kustomize EnvSources files before build
 	if err = dec.DecryptSources(dirPath); err != nil {
 		return nil, fmt.Errorf("error decrypting sources: %w", err)