Name:      caller.PodServiceAccount,
	}
	// First, make sure the caller is allowed to impersonate, in general
	if _, f := na.trustedNodeAccounts[callerSa]; !f {
		return fmt.Errorf("caller (%v) is not allowed to impersonate", caller)
	}
	// Next, make sure the identity they want to impersonate is valid, in general
	requestedIdentity, err := spiffe.ParseIdentity(requestedIdentityString)
	if err != nil {

apiVersion: release-notes/v2
kind: feature
area: security
issue:
  - 47489
releaseNotes:
  - |-
    **Added** support for istio CA to handle node authorization for CSRs with impersonate identity from remote clusters.

			return nil, status.Error(codes.Unauthenticated, "request impersonation authentication failure")
		}
		// Node is authorized to impersonate; overwrite the SAN to the impersonated identity.
		sans = []string{impersonatedIdentity}
	}
	serverCaLog.Debugf("generating a certificate, sans: %v, requested ttl: %s", sans, time.Duration(request.ValidityDuration*int64(time.Second)))

			// since it is normally only used for building the toolchain in the first
			// place. However, 'go tool dist list' is useful for listing all supported
			// platforms.
			//
			// If the dist tool does not exist, impersonate this command.
			if impersonateDistList(args[2:]) {
				// If it becomes necessary, we could increment an additional counter to indicate
				// that we're impersonating dist list if knowing that becomes important?

// SelfSubjectReview contains the user information that the kube-apiserver has about the user making this request.
// When using impersonation, users will receive the user info of the user being impersonated.  If impersonation or
// request header authentication is used, any extra keys will have their case ignored and returned as lowercase.
message SelfSubjectReview {
  // Standard object's metadata.

// SelfSubjectReview contains the user information that the kube-apiserver has about the user making this request.
// When using impersonation, users will receive the user info of the user being impersonated.  If impersonation or
// request header authentication is used, any extra keys will have their case ignored and returned as lowercase.
message SelfSubjectReview {
  // Standard object's metadata.

  repeated string items = 1;
}

// SelfSubjectReview contains the user information that the kube-apiserver has about the user making this request.
// When using impersonation, users will receive the user info of the user being impersonated.  If impersonation or
// request header authentication is used, any extra keys will have their case ignored and returned as lowercase.
message SelfSubjectReview {
  // Standard object's metadata.

  repeated string items = 1;
}

// SelfSubjectReview contains the user information that the kube-apiserver has about the user making this request.
// When using impersonation, users will receive the user info of the user being impersonated.  If impersonation or
// request header authentication is used, any extra keys will have their case ignored and returned as lowercase.
message SelfSubjectReview {
  // Standard object's metadata.

  repeated string items = 1;
}

// SelfSubjectReview contains the user information that the kube-apiserver has about the user making this request.
// When using impersonation, users will receive the user info of the user being impersonated.  If impersonation or
// request header authentication is used, any extra keys will have their case ignored and returned as lowercase.
message SelfSubjectReview {
  // Standard object's metadata.