fallback to reading spiffe uri from csr (#9)

Signed-off-by: Abhijeet V <[email protected]>
AthenZ · Mar 27, 2024 · 08906b3 · 08906b3
1 parent 723da09
commit 08906b3
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Showing 16 changed files with 929 additions and 74 deletions.
diff --git a/controller/signer.go b/controller/signer.go
@@ -107,14 +107,26 @@ func (s *Signer) Check(ctx context.Context, issuerObject v1alpha1.Issuer) error
 	}
 
 	s.ztsClient = zts.NewClient(s.ztsEndpoint, tr)
-	s.ztsClient.AddCredentials("User-Agent", "athenz-issuer-v0.1.0")
+	s.ztsClient.AddCredentials("User-Agent", "athenz-issuer")
 	return nil
 }
 
 func (s *Signer) Sign(ctx context.Context, cr signer.CertificateRequestObject, issuerObject v1alpha1.Issuer) (signer.PEMBundle, error) {
 
+	// load client certificate request
+	clientCRTTemplate, _, csrBytes, err := cr.GetRequest()
+	if err != nil {
+		return signer.PEMBundle{}, err
+	}
+
 	// Get the service account name from cr
 	spiffeURI, err := issuerutil.ExtractSpiffeURIFromAnnotations(cr.GetAnnotations())
+	if err != nil {
+		fmt.Printf("Unable to extract spiffe uri from annotations, err: %v\n", err)
+		spiffeURI, err = issuerutil.ExtractSpiffeURIFromCSR(csrBytes)
+	}
+
+	fmt.Printf("spiffeURI=%s\n", spiffeURI)
 	spiffeNS, spiffeSA, err := issuerutil.ExtractNamespaceAndServiceAccountFromSpiffeURI(spiffeURI)
 
 	// use the token in zts api call
@@ -123,24 +135,14 @@ func (s *Signer) Sign(ctx context.Context, cr signer.CertificateRequestObject, i
 		return signer.PEMBundle{}, err
 	}
 
-	// load client certificate request
-	clientCRTTemplate, _, csrBytes, err := cr.GetRequest()
-	// _, _, csrBytes, err := cr.GetRequest()
-	if err != nil {
-		return signer.PEMBundle{}, err
-	}
-
 	athenzDomain, athenzService := issuerutil.ExtractDomainServiceFromServiceAccount(spiffeSA)
 	athenzProvider := fmt.Sprintf("%s.%s-%s", s.providerPrefix, s.cloud, s.region)
 
 	data, err := json.Marshal(&K8SAttestationData{
 		IdentityToken: string(saTok),
 	})
 
-	fmt.Println("+++++++++++++++++++++++")
-	fmt.Printf("athenzDomain: %s\n", athenzDomain)
-	fmt.Printf("athenzService: %s\n", athenzService)
-	fmt.Printf("athenzProvider: %s\n", athenzProvider)
+	fmt.Printf("athenzDomain=%s athenzService=%s athenzProvider=%s\n", athenzDomain, athenzService, athenzProvider)
 
 	if s.cloud == "local" {
 		// generate random ca private key
@@ -169,6 +171,7 @@ func (s *Signer) Sign(ctx context.Context, cr signer.CertificateRequestObject, i
 		}
 
 		clientCrt := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: clientCRTRaw})
+		fmt.Printf("clientCrt=%s\n", clientCrt)
 		return signer.PEMBundle{
 			ChainPEM: clientCrt,
 		}, nil
@@ -187,9 +190,7 @@ func (s *Signer) Sign(ctx context.Context, cr signer.CertificateRequestObject, i
 			return signer.PEMBundle{}, err
 		}
 
-		fmt.Println("+++++++++++++++++++++++")
 		if identity != nil {
-			// fmt.Printf("identity: %+v\n", identity)
 			return signer.PEMBundle{
 				ChainPEM: []byte(identity.X509Certificate),
 			}, nil

diff --git a/deploy/charts/athenz-issuer/Chart.yaml b/deploy/charts/athenz-issuer/Chart.yaml
@@ -5,7 +5,7 @@ type: application
 description: Athenz issuer is a sub-project of Athenz which acts as an external issuer for cert-manager to deliver Athenz X.509 certificate to pods
 
 home: https://www.athenz.io/projects.html#athenz-issuer
-icon: https://raw.githubusercontent.com/AthenZ/website/f3e94b8a8ecd2ff0b7948a891e73811dddfde453/favicon.ico
+icon: https://raw.githubusercontent.com/AthenZ/website/6630075617e71732059f8c40b6ae82a04b8a034f/images/athenz-logo.png
 keywords:
 - athenz
 - cert-manager

diff --git a/go.mod b/go.mod
@@ -5,16 +5,16 @@ go 1.21
 toolchain go1.21.8
 
 require (
-	github.com/AthenZ/athenz v1.11.53
+	github.com/AthenZ/athenz v1.11.54
 	github.com/cert-manager/cert-manager v1.14.4
 	github.com/cert-manager/issuer-lib v0.6.0
 	github.com/go-logr/logr v1.4.1
 	github.com/stretchr/testify v1.9.0
 	go.uber.org/zap v1.27.0
-	k8s.io/api v0.29.2
-	k8s.io/apiextensions-apiserver v0.29.2
-	k8s.io/apimachinery v0.29.2
-	k8s.io/client-go v0.29.2
+	k8s.io/api v0.29.3
+	k8s.io/apiextensions-apiserver v0.29.3
+	k8s.io/apimachinery v0.29.3
+	k8s.io/client-go v0.29.3
 	k8s.io/klog/v2 v2.120.1
 	k8s.io/utils v0.0.0-20240310230437-4693a0247e57
 	sigs.k8s.io/controller-runtime v0.17.2
@@ -38,7 +38,7 @@ require (
 	github.com/go-openapi/swag v0.22.7 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/golang/protobuf v1.5.4 // 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
@@ -63,12 +63,12 @@ require (
 	github.com/spf13/cobra v1.8.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/crypto v0.20.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
 	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
-	golang.org/x/net v0.21.0 // indirect
-	golang.org/x/oauth2 v0.16.0 // indirect
-	golang.org/x/sys v0.17.0 // indirect
-	golang.org/x/term v0.17.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
+	golang.org/x/oauth2 v0.17.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/term v0.18.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
@@ -77,7 +77,7 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/component-base v0.29.2 // indirect
+	k8s.io/component-base v0.29.3 // indirect
 	k8s.io/kube-openapi v0.0.0-20240103051144-eec4567ac022 // indirect
 	sigs.k8s.io/gateway-api v1.0.0 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect

diff --git a/go.sum b/go.sum
@@ -1,5 +1,5 @@
-github.com/AthenZ/athenz v1.11.53 h1:aJtSiKtw++yYwbPL0PWllbbbhz4J8ysdHOkhBYEpg7k=
-github.com/AthenZ/athenz v1.11.53/go.mod h1:B+EDdrlHJ/SlS5IqH3GIC7e4E0cpSox+DNrJdGIutEA=
+github.com/AthenZ/athenz v1.11.54 h1:3rnUAOwMSk9ipFXhzB/UWjrBZ0yrKP1/aDDkj7RIWVE=
+github.com/AthenZ/athenz v1.11.54/go.mod h1:zpJZxAtX6YLEeMRpJzTC3TI6MQv3lrzz7YiPAPFvcDU=
 github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 h1:mFRzDkZVAjdal+s7s0MwaRv9igoPqLRdzOLzw/8Xvq8=
 github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
 github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74 h1:Kk6a4nehpJ3UuJRqlA3JxYxBZEqCeOmATOvrbT4p9RA=
@@ -51,8 +51,8 @@ github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
-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/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 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 v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -83,7 +83,6 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
-github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
 github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 h1:jWpvCLoY8Z/e3VKvlsiIGKtc+UG6U5vzxaoagmhXfyg=
 github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0/go.mod h1:QUyp042oQthUoa9bqDv0ER0wrtXnBruoNd7aNjkbP+k=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
@@ -138,8 +137,8 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
-golang.org/x/crypto v0.20.0 h1:jmAMJJZXr5KiCw05dfYK9QnqaqKLYXijU23lsEdcQqg=
-golang.org/x/crypto v0.20.0/go.mod h1:Xwo95rrVNIoSMx9wa1JroENMToLWn3RNVrTBpLHgZPQ=
+golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
+golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
 golang.org/x/exp v0.0.0-20231226003508-02704c960a9b h1:kLiC65FbiHWFAOu+lxwNPujcsl8VYyTYYEZnsOO1WK4=
 golang.org/x/exp v0.0.0-20231226003508-02704c960a9b/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@@ -154,10 +153,10 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
-golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
-golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
-golang.org/x/oauth2 v0.16.0 h1:aDkGMBSYxElaoP81NpoUoz2oo2R2wHdZpGToUxfyQrQ=
-golang.org/x/oauth2 v0.16.0/go.mod h1:hqZ+0LWXsiVoZpeld6jVt06P3adbS2Uu911W1SsJv2o=
+golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
+golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/oauth2 v0.17.0 h1:6m3ZPmLEFdVxKKWnKq4VqZ60gutO35zm+zrAHVmHyDQ=
+golang.org/x/oauth2 v0.17.0/go.mod h1:OzPDGQiuQMguemayvdylqddI7qcD9lnSDb+1FiwQ5HA=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -175,15 +174,15 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
-golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
 golang.org/x/term v0.12.0/go.mod h1:owVbMEjm3cBLCHdkQu9b1opXd4ETQWc3BhuQGKgXgvU=
-golang.org/x/term v0.17.0 h1:mkTF7LCd6WGJNL3K1Ad7kwxNfYAW6a8a8QqtMblp/4U=
-golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
+golang.org/x/term v0.18.0 h1:FcHjZXDMxI8mM3nwhX9HlKop4C0YQvCVCdwYl2wOtE8=
+golang.org/x/term v0.18.0/go.mod h1:ILwASektA3OnRv7amZ1xhE/KTR+u50pbXfZ03+6Nx58=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
@@ -226,16 +225,16 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-k8s.io/api v0.29.2 h1:hBC7B9+MU+ptchxEqTNW2DkUosJpp1P+Wn6YncZ474A=
-k8s.io/api v0.29.2/go.mod h1:sdIaaKuU7P44aoyyLlikSLayT6Vb7bvJNCX105xZXY0=
-k8s.io/apiextensions-apiserver v0.29.2 h1:UK3xB5lOWSnhaCk0RFZ0LUacPZz9RY4wi/yt2Iu+btg=
-k8s.io/apiextensions-apiserver v0.29.2/go.mod h1:aLfYjpA5p3OwtqNXQFkhJ56TB+spV8Gc4wfMhUA3/b8=
-k8s.io/apimachinery v0.29.2 h1:EWGpfJ856oj11C52NRCHuU7rFDwxev48z+6DSlGNsV8=
-k8s.io/apimachinery v0.29.2/go.mod h1:6HVkd1FwxIagpYrHSwJlQqZI3G9LfYWRPAkUvLnXTKU=
-k8s.io/client-go v0.29.2 h1:FEg85el1TeZp+/vYJM7hkDlSTFZ+c5nnK44DJ4FyoRg=
-k8s.io/client-go v0.29.2/go.mod h1:knlvFZE58VpqbQpJNbCbctTVXcd35mMyAAwBdpt4jrA=
-k8s.io/component-base v0.29.2 h1:lpiLyuvPA9yV1aQwGLENYyK7n/8t6l3nn3zAtFTJYe8=
-k8s.io/component-base v0.29.2/go.mod h1:BfB3SLrefbZXiBfbM+2H1dlat21Uewg/5qtKOl8degM=
+k8s.io/api v0.29.3 h1:2ORfZ7+bGC3YJqGpV0KSDDEVf8hdGQ6A03/50vj8pmw=
+k8s.io/api v0.29.3/go.mod h1:y2yg2NTyHUUkIoTC+phinTnEa3KFM6RZ3szxt014a80=
+k8s.io/apiextensions-apiserver v0.29.3 h1:9HF+EtZaVpFjStakF4yVufnXGPRppWFEQ87qnO91YeI=
+k8s.io/apiextensions-apiserver v0.29.3/go.mod h1:po0XiY5scnpJfFizNGo6puNU6Fq6D70UJY2Cb2KwAVc=
+k8s.io/apimachinery v0.29.3 h1:2tbx+5L7RNvqJjn7RIuIKu9XTsIZ9Z5wX2G22XAa5EU=
+k8s.io/apimachinery v0.29.3/go.mod h1:hx/S4V2PNW4OMg3WizRrHutyB5la0iCUbZym+W0EQIU=
+k8s.io/client-go v0.29.3 h1:R/zaZbEAxqComZ9FHeQwOh3Y1ZUs7FaHKZdQtIc2WZg=
+k8s.io/client-go v0.29.3/go.mod h1:tkDisCvgPfiRpxGnOORfkljmS+UrW+WtXAy2fTvXJB0=
+k8s.io/component-base v0.29.3 h1:Oq9/nddUxlnrCuuR2K/jp6aflVvc0uDvxMzAWxnGzAo=
+k8s.io/component-base v0.29.3/go.mod h1:Yuj33XXjuOk2BAaHsIGHhCKZQAgYKhqIxIjIr2UXYio=
 k8s.io/klog/v2 v2.120.1 h1:QXU6cPEOIslTGvZaXvFWiP9VKyeet3sawzTOvdXb4Vw=
 k8s.io/klog/v2 v2.120.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kube-openapi v0.0.0-20240103051144-eec4567ac022 h1:avRdiaB03v88Mfvum2S3BBwkNuTlmuar4LlfO9Hajko=

diff --git a/internal/util.go b/internal/util.go
@@ -16,6 +16,8 @@ limitations under the License.
 package issuerutil
 
 import (
+	"crypto/x509"
+	"encoding/pem"
 	"fmt"
 	"regexp"
 	"strings"
@@ -64,4 +66,33 @@ func ExtractDomainServiceFromServiceAccount(saName string) (string, string) {
 		service = saName[idx+1:]
 	}
 	return domain, service
-}
+}
+
+func ExtractSpiffeURIFromCSR(csrBytes []byte) (string, error) {
+	// Decode the PEM encoded CSR
+	block, rest := pem.Decode(csrBytes)
+	if block == nil {
+		return "", fmt.Errorf("no PEM block found in input")
+	}
+	if block.Type != "CERTIFICATE REQUEST" {
+		return "", fmt.Errorf("not a certificate request PEM block")
+	}
+
+	if len(rest) > 0 {
+		return "", fmt.Errorf("unexpected data found after PEM block")
+	}
+
+	// Parse the CSR
+	csr, err := x509.ParseCertificateRequest(block.Bytes)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse CSR: %v", err)
+	}
+
+	for _, uri := range csr.URIs {
+		if strings.HasPrefix(uri.String(), "spiffe://") {
+			return uri.String(), nil
+		}
+	}
+
+	return "", fmt.Errorf("unable to extract SPIFFE URI from CSR")
+}