Deny access to resources

This page explains how to deny principals access by preventing them from using specific Identity and Access Management (IAM) permissions.

In IAM, you deny access with deny policies. Each deny policy is attached to a Google Cloud organization, folder, or project. A deny policy contains deny rules, which identify principals and list the permissions that the principals cannot use.

Deny policies are separate from allow policies, also known as IAM policies. An allow policy provides access to resources by granting IAM roles to principals.

You can manage deny policies with the Google Cloud console, Google Cloud CLI, or the IAM v2 REST API.

Before you begin

  • Enable the IAM API.

    Enable the API

  • Set up authentication.

    Select the tab for how you plan to use the samples on this page:

    Console

    When you use the Google Cloud console to access Google Cloud services and APIs, you don't need to set up authentication.

    gcloud

    In the Google Cloud console, activate Cloud Shell.

    Activate Cloud Shell

    At the bottom of the Google Cloud console, a Cloud Shell session starts and displays a command-line prompt. Cloud Shell is a shell environment with the Google Cloud CLI already installed and with values already set for your current project. It can take a few seconds for the session to initialize.

    Terraform

    To use the Terraform samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

    1. Install the Google Cloud CLI.

    2. To initialize the gcloud CLI, run the following command: 

      gcloud init

    3. If you're using a local shell, then create local authentication credentials for your user account: 

      gcloud auth application-default login

      You don't need to do this if you're using Cloud Shell.

    For more information, see Set up authentication for a local development environment in the Google Cloud authentication documentation.

    Go

    To use the Go samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

    1. Install the Google Cloud CLI.

    2. To initialize the gcloud CLI, run the following command: 

      gcloud init

    3. If you're using a local shell, then create local authentication credentials for your user account: 

      gcloud auth application-default login

      You don't need to do this if you're using Cloud Shell.

    For more information, see Set up authentication for a local development environment in the Google Cloud authentication documentation.

    Java

    To use the Java samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

    1. Install the Google Cloud CLI.

    2. To initialize the gcloud CLI, run the following command: 

      gcloud init

    3. If you're using a local shell, then create local authentication credentials for your user account: 

      gcloud auth application-default login

      You don't need to do this if you're using Cloud Shell.

    For more information, see Set up authentication for a local development environment in the Google Cloud authentication documentation.

    Node.js

    To use the Node.js samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

    1. Install the Google Cloud CLI.

    2. To initialize the gcloud CLI, run the following command: 

      gcloud init

    3. If you're using a local shell, then create local authentication credentials for your user account: 

      gcloud auth application-default login

      You don't need to do this if you're using Cloud Shell.

    For more information, see Set up authentication for a local development environment in the Google Cloud authentication documentation.

    Python

    To use the Python samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

    1. Install the Google Cloud CLI.

    2. To initialize the gcloud CLI, run the following command: 

      gcloud init

    3. If you're using a local shell, then create local authentication credentials for your user account: 

      gcloud auth application-default login

      You don't need to do this if you're using Cloud Shell.

    For more information, see Set up authentication for a local development environment in the Google Cloud authentication documentation.

    REST

    To use the REST API samples on this page in a local development environment, you use the credentials you provide to the gcloud CLI.

      Install the Google Cloud CLI, then initialize it by running the following command: 

      gcloud init

    For more information, see Authenticate for using REST in the Google Cloud authentication documentation.

  • Read the overview of deny policies.

Required roles

To get the permissions that you need to manage deny policies, ask your administrator to grant you the following IAM roles on the organization:

  • To view deny policies: Deny Reviewer (roles/iam.denyReviewer)
  • To view, create, update, and delete deny policies: Deny Admin (roles/iam.denyAdmin)

For more information about granting roles, see Manage access to projects, folders, and organizations.

These predefined roles contain the permissions required to manage deny policies. To see the exact permissions that are required, expand the Required permissions section:

Required permissions

The following permissions are required to manage deny policies:

  • To view deny policies:
    • iam.denypolicies.get
    • iam.denypolicies.list
  • To create, update, and delete deny policies:
    • iam.denypolicies.create
    • iam.denypolicies.delete
    • iam.denypolicies.get
    • iam.denypolicies.update

You might also be able to get these permissions with custom roles or other predefined roles.

Identify permissions to deny

Before you create a deny policy, you must decide which permissions you want to deny, and which principals should be denied these permissions.

Only some permissions can be denied. For a list of permissions that you can deny, see Permissions supported in deny policies.

In some cases, you can also use permission groups to deny sets of permissions. For more information, see Permission groups.

You manage deny policies with the v2 REST API, which requires a special format for permission names. For example, the permission to create an IAM custom role is named as follows:

  • v1 API: iam.roles.create
  • v2 API: iam.googleapis.com/roles.create

Create a deny policy

You can add deny policies to organizations, folders, and projects. Each resource can have up to 500 deny policies.

Deny policies contain deny rules, which specify the following:

  • The permissions to deny.
  • The principals that are denied those permissions.

  • Optional: Principals that are exempt from the denial of permissions.

    For example, you can deny a permission to a group, but exempt specific users who belong to that group.

  • Optional: A condition expression that specifies when the principals cannot use the permissions. In deny policies, condition expressions can only use functions for resource tags—other functions and operators are not supported.

Each resource can have up to 500 deny rules across all of its attached deny policies.

Deny policies are inherited through the resource hierarchy. For example, if you deny a permission at the organization level, that permission will also be denied on the folders and projects within that organization, and on the service-specific resources within each project.

Deny policies override allow policies. If a principal is granted a role that contains a specific permission, but a deny policy says that the principal cannot use that permission, then the principal cannot use the permission.

Console

  1. In the Google Cloud console, go to the Deny tab on the IAM page.

    Go to IAM

  2. Select a project, folder, or organization.

  3. Click Create deny policy.

  4. In the Policy name section, define the policy ID by doing one of the following:

    • In the Display name field, enter a display name for the policy. Filling out this field automatically fills out the ID field. If you want to change the ID of the policy, update the text in the ID field.
    • In the ID field, enter an ID for the policy.

  5. In the Deny rules section, define the policy's deny rules. Each deny policy must have at least one deny rule. To add additional deny rules, click Add deny rule.

    For each deny rule, do the following:

    1. In the Denied principals field, add one or more principals that you want to prevent from using the specified permissions. The principal can be any of the principal types in the list of IAM v2 principal identifiers, except the principals whose IDs begin with deleted:.
    2. Optional: In the Exception principals field, add the principals that you want to be able to use the specified permissions, even if those principals are included in Denied principals section. For example, you can use this field to make an exception for specific users who belong to a denied group.

    3. In the Denied permissions sections, add the permissions that you want to deny. The permissions must be supported in deny policies.

      In some cases, you can also use permission groups to deny sets of permissions. For more information, see Permission groups.

    4. Optional: Add exception permissions. Exception permissions are permissions that you don't want this deny rule to deny, even if they're included in the list of denied permissions. For example, you can use this field to make exceptions for specific permissions in a permission group.

      To add exception permissions, click Exception permissions, click Add another permission, and then enter the permission in the Permission 1 field. Continue adding permissions until you've added all permissions that you want to exempt from the deny policy.

    5. Optional: Add a denial condition to specify when the principals can't use the permission. To add a denial condition, click Add denial condition, and then define the following fields:

      • Title: Optional. A brief summary of the purpose of the condition.
      • Description: Optional. A longer description of the condition.

      • Condition expression: You can add a condition expression using the Condition builder or Condition editor. The condition builder provides an interactive interface to select your desired condition type, operator, and other applicable details about the expression. The condition editor provides a text-based interface to manually enter an expression using Common Expression Language (CEL) syntax.

        Denial conditions must be based on resource tags. Other functions and operators aren't supported.

  6. Click Create.

gcloud

To create a deny policy for a resource, start by creating a JSON file that contains the policy. A deny policy uses the following format:

{
  "displayName": "POLICY_NAME",
  "rules": [
    {
      "denyRule": DENY_RULE_1
    },
    {
      "denyRule": DENY_RULE_2
    },
    {
      "denyRule": DENY_RULE_N
    }
  ]
}

Provide the following values:

  • POLICY_NAME: The display name for the deny policy.

  • DENY_RULE_1, DENY_RULE_2, ...DENY_RULE_N: The deny rules in the policy. Each deny rule can contain these fields:

    • deniedPermissions: A list of permissions that the specified principals cannot use. The permissions must be supported in deny policies.

      In some cases, you can also use permission groups to deny sets of permissions. For more information, see Permission groups.

    • exceptionPermissions: A list of permissions that the specified principals can use, even if those permissions are included in deniedPermissions. For example, you can use this field to make exceptions for specific permissions in a group of permissions.
    • deniedPrincipals: A list of principals that cannot use the specified permissions. Use the v2 API format for principal identifiers.
    • exceptionPrincipals: Optional. A list of principals that can use the specified permissions, even if those principals are included in deniedPrincipals. For example, you can use this field to make an exception for specific users who belong to a denied group. Use the v2 API format for principal identifiers.

    • denialCondition: Optional. A condition expression that specifies when the principals cannot use the permissions. Contains the following fields:

    For examples of deny rules, see Common use cases.

For example, the following deny policy contains one deny rule, which denies one permission to Lucian:

{
  "displayName": "My deny policy.",
  "rules": [
    {
      "denyRule": {
        "deniedPrincipals": [
          "principal://goog/subject/lucian@example.com"
        ],
        "deniedPermissions": [
          "iam.googleapis.com/roles.create"
        ]
      }
    }
  ]
}

Next, run the gcloud iam policies create command:

gcloud iam policies create POLICY_ID \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies \
    --policy-file=POLICY_FILE

Provide the following values:

  • POLICY_ID: The identifier for the deny policy.

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_FILE: The filepath for the JSON file that contains the deny policy.

By default, if this command succeeds, it does not print any output. To print a detailed response, add the flag --format=json to the command.

For example, the following command creates a deny policy named my-deny-policy for the project my-project, using a file named policy.json:

gcloud iam policies create my-deny-policy \
    --attachment-point=cloudresourcemanager.googleapis.com/projects/my-project \
    --kind=denypolicies \
    --policy-file=policy.json

Terraform

To learn how to apply or remove a Terraform configuration, see Basic Terraform commands. For more information, see the Terraform provider reference documentation. 

data "google_project" "default" {
}

# Create a service account
resource "google_service_account" "default" {
  display_name = "IAM Deny Example - Service Account"
  account_id   = "example-sa"
  project      = data.google_project.default.project_id
}

# Create an IAM deny policy that denies a permission for the service account
resource "google_iam_deny_policy" "default" {
  provider     = google-beta
  parent       = urlencode("cloudresourcemanager.googleapis.com/projects/${data.google_project.default.project_id}")
  name         = "my-deny-policy"
  display_name = "My deny policy."
  rules {
    deny_rule {
      denied_principals  = ["principal://iam.googleapis.com/projects/-/serviceAccounts/${google_service_account.default.email}"]
      denied_permissions = ["iam.googleapis.com/roles.create"]
    }
  }
}

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"
	"cloud.google.com/go/iam/apiv2/iampb"

	"google.golang.org/genproto/googleapis/type/expr"
)

// createDenyPolicy creates a deny policy.
func createDenyPolicy(w io.Writer, projectID, policyID string) error {
	// You can add deny policies to organizations, folders, and projects.
	// Each of these resources can have up to 5 deny policies.
	// Deny policies contain deny rules, which specify the following:
	// 1. The permissions to deny and/or exempt.
	// 2. The principals that are denied, or exempted from denial.
	// 3. An optional condition on when to enforce the deny rules.

	// projectID := "your_project_id"
	// policyID := "your_policy_id"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	denyRule := &iampb.DenyRule{
		// Add one or more principals who should be denied the permissions specified in this rule.
		// For more information on allowed values,
		// see: https://cloud.google.com/iam/help/deny/principal-identifiers
		DeniedPrincipals: []string{"principalSet://goog/public:all"},
		// Optionally, set the principals who should be exempted from the
		// list of denied principals. For example, if you want to deny certain permissions
		// to a group but exempt a few principals, then add those here.
		// ExceptionPrincipals: []string{"principalSet://goog/group/project-admins@example.com"},
		//
		// Set the permissions to deny.
		// The permission value is of the format: service_fqdn/resource.action
		// For the list of supported permissions,
		// see: https://cloud.google.com/iam/help/deny/supported-permissions
		DeniedPermissions: []string{"cloudresourcemanager.googleapis.com/projects.delete"},
		// Optionally, add the permissions to be exempted from this rule.
		// Meaning, the deny rule will not be applicable to these permissions.
		// ExceptionPermissions: []string{"cloudresourcemanager.googleapis.com/projects.create"},
		//
		// Set the condition which will enforce the deny rule.
		// If this condition is true, the deny rule will be applicable.
		// Else, the rule will not be enforced.
		// The expression uses Common Expression Language syntax (CEL).
		// Here we block access based on tags.
		//
		// Here, we create a deny rule that denies the
		// cloudresourcemanager.googleapis.com/projects.delete permission
		// to everyone except project-admins@example.com for resources that are tagged test.
		// A tag is a key-value pair that can be attached to an organization, folder, or project.
		// For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
		DenialCondition: &expr.Expr{
			Expression: "!resource.matchTag('12345678/env', 'test')",
		},
	}

	// Add the deny rule and a description for it.
	policyRule := &iampb.PolicyRule{
		Description: "block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value test",
		Kind: &iampb.PolicyRule_DenyRule{
			DenyRule: denyRule,
		},
	}

	policy := &iampb.Policy{
		DisplayName: "Restrict project deletion access",
		Rules:       [](*iampb.PolicyRule){policyRule},
	}

	req := &iampb.CreatePolicyRequest{
		// Construct the full path of the resource's deny policies.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies"
		Parent:   fmt.Sprintf("policies/%s/denypolicies", attachmentPoint),
		Policy:   policy,
		PolicyId: policyID,
	}
	op, err := policiesClient.CreatePolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create policy: %w", err)
	}

	policy, err = op.Wait(ctx)
	if err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Policy %s created\n", policy.GetName())

	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.CreatePolicyRequest;
import com.google.iam.v2.DenyRule;
import com.google.iam.v2.PoliciesClient;
import com.google.iam.v2.Policy;
import com.google.iam.v2.PolicyRule;
import com.google.longrunning.Operation;
import com.google.type.Expr;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateDenyPolicy {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    // Specify the id of the Deny policy you want to create.
    String policyId = "deny-policy-id";

    createDenyPolicy(projectId, policyId);
  }

  // Create a deny policy.
  // You can add deny policies to organizations, folders, and projects.
  // Each of these resources can have up to 5 deny policies.
  //
  // Deny policies contain deny rules, which specify the following:
  // 1. The permissions to deny and/or exempt.
  // 2. The principals that are denied, or exempted from denial.
  // 3. An optional condition on when to enforce the deny rules.
  public static void createDenyPolicy(String projectId, String policyId)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    try (PoliciesClient policiesClient = PoliciesClient.create()) {
      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached.
      // Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
      String policyParent = String.format("policies/%s/denypolicies", attachmentPoint);

      DenyRule denyRule =
          DenyRule.newBuilder()
              // Add one or more principals who should be denied the permissions specified in this
              // rule.
              // For more information on allowed values, see:
              // https://cloud.google.com/iam/docs/principal-identifiers
              .addDeniedPrincipals("principalSet://goog/public:all")

              // Optionally, set the principals who should be exempted from the
              // list of denied principals. For example, if you want to deny certain permissions
              // to a group but exempt a few principals, then add those here.
              // .addExceptionPrincipals(
              //     "principalSet://goog/group/project-admins@example.com")

              // Set the permissions to deny.
              // The permission value is of the format: service_fqdn/resource.action
              // For the list of supported permissions, see:
              // https://cloud.google.com/iam/help/deny/supported-permissions
              .addDeniedPermissions("cloudresourcemanager.googleapis.com/projects.delete")

              // Optionally, add the permissions to be exempted from this rule.
              // Meaning, the deny rule will not be applicable to these permissions.
              // .addExceptionPermissions("cloudresourcemanager.googleapis.com/projects.create")

              // Set the condition which will enforce the deny rule. If this condition is true,
              // the deny rule will be applicable. Else, the rule will not be enforced.
              .setDenialCondition(
                  Expr.newBuilder()
                      // The expression uses Common Expression Language syntax (CEL).
                      // Here we block access based on tags.
                      //
                      // A tag is a key-value pair that can be attached to an organization, folder,
                      // or project. You can use deny policies to deny permissions based on tags
                      // without adding an IAM Condition to every role grant.
                      // For example, imagine that you tag all of your projects as dev, test, or
                      // prod. You want only members of project-admins@example.com to be able to
                      // perform operations on projects that are tagged prod.
                      // To solve this problem, you create a deny rule that denies the
                      // cloudresourcemanager.googleapis.com/projects.delete permission to everyone
                      // except project-admins@example.com for resources that are tagged test.
                      .setExpression("!resource.matchTag('12345678/env', 'test')")
                      .setTitle("Only for test projects")
                      .build())
              .build();

      // Add the deny rule and a description for it.
      Policy policy =
          Policy.newBuilder()
              // Set the deny rule.
              .addRules(
                  PolicyRule.newBuilder()
                      // Set a description for the rule.
                      .setDescription(
                          "block all principals from deleting projects, unless the principal"
                              + " is a member of project-admins@example.com and the project"
                              + " being deleted has a tag with the value test")
                      .setDenyRule(denyRule)
                      .build())
              .build();

      // Set the policy resource path, policy rules and a unique ID for the policy.
      CreatePolicyRequest createPolicyRequest =
          CreatePolicyRequest.newBuilder()
              .setParent(policyParent)
              .setPolicy(policy)
              .setPolicyId(policyId)
              .build();

      // Build the create policy request.
      Operation operation =
          policiesClient
              .createPolicyCallable()
              .futureCall(createPolicyRequest)
              .get(3, TimeUnit.MINUTES);

      // Wait for the operation to complete.
      if (operation.hasError()) {
        System.out.println("Error in creating the policy " + operation.getError());
        return;
      }

      // Retrieve the policy name.
      Policy response = policiesClient.getPolicy(String.format("%s/%s", policyParent, policyId));
      String policyName = response.getName();
      System.out.println(
          "Created the deny policy: " + policyName.substring(policyName.lastIndexOf("/") + 1));
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const policyID = 'YOUR_POLICY_ID';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

const denyRule = {
  // Add one or more principals who should be denied the permissions specified in this rule.
  // For more information on allowed values, see: https://cloud.google.com/iam/help/deny/principal-identifiers
  deniedPrincipals: ['principalSet://goog/public:all'],
  // Optionally, set the principals who should be exempted from the
  // list of denied principals. For example, if you want to deny certain permissions
  // to a group but exempt a few principals, then add those here.
  // exceptionPrincipals: ['principalSet://goog/group/project-admins@example.com'],
  // Set the permissions to deny.
  // The permission value is of the format: service_fqdn/resource.action
  // For the list of supported permissions, see: https://cloud.google.com/iam/help/deny/supported-permissions
  deniedPermissions: ['cloudresourcemanager.googleapis.com/projects.delete'],
  // Optionally, add the permissions to be exempted from this rule.
  // Meaning, the deny rule will not be applicable to these permissions.
  // exceptionPermissions: ['cloudresourcemanager.googleapis.com/projects.create']
  //
  // Set the condition which will enforce the deny rule.
  // If this condition is true, the deny rule will be applicable. Else, the rule will not be enforced.
  // The expression uses Common Expression Language syntax (CEL).
  // Here we block access based on tags.
  //
  // Here, we create a deny rule that denies the cloudresourcemanager.googleapis.com/projects.delete permission to everyone except project-admins@example.com for resources that are tagged test.
  // A tag is a key-value pair that can be attached to an organization, folder, or project.
  // For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
  denialCondition: {
    expression: '!resource.matchTag("12345678/env", "test")',
  },
};

async function createDenyPolicy() {
  const request = {
    parent: `policies/${attachmentPoint}/denypolicies`,
    policy: {
      displayName: 'Restrict project deletion access',
      rules: [
        {
          description:
            'block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value test',
          denyRule,
        },
      ],
    },
    policyId,
  };

  const [operation] = await iamClient.createPolicy(request);
  const [policy] = await operation.promise();

  console.log(`Created the deny policy: ${policy.name}`);
}

createDenyPolicy();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 



def create_deny_policy(project_id: str, policy_id: str) -> None:
    from google.cloud import iam_v2
    from google.cloud.iam_v2 import types

    """
      Create a deny policy.
      You can add deny policies to organizations, folders, and projects.
      Each of these resources can have up to 5 deny policies.

      Deny policies contain deny rules, which specify the following:
      1. The permissions to deny and/or exempt.
      2. The principals that are denied, or exempted from denial.
      3. An optional condition on when to enforce the deny rules.

      Params:
      project_id: ID or number of the Google Cloud project you want to use.
      policy_id: Specify the ID of the deny policy you want to create.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    deny_rule = types.DenyRule()
    # Add one or more principals who should be denied the permissions specified in this rule.
    # For more information on allowed values, see: https://cloud.google.com/iam/help/deny/principal-identifiers
    deny_rule.denied_principals = ["principalSet://goog/public:all"]

    # Optionally, set the principals who should be exempted from the
    # list of denied principals. For example, if you want to deny certain permissions
    # to a group but exempt a few principals, then add those here.
    # deny_rule.exception_principals = ["principalSet://goog/group/project-admins@example.com"]

    # Set the permissions to deny.
    # The permission value is of the format: service_fqdn/resource.action
    # For the list of supported permissions, see: https://cloud.google.com/iam/help/deny/supported-permissions
    deny_rule.denied_permissions = [
        "cloudresourcemanager.googleapis.com/projects.delete"
    ]

    # Optionally, add the permissions to be exempted from this rule.
    # Meaning, the deny rule will not be applicable to these permissions.
    # deny_rule.exception_permissions = ["cloudresourcemanager.googleapis.com/projects.create"]

    # Set the condition which will enforce the deny rule.
    # If this condition is true, the deny rule will be applicable. Else, the rule will not be enforced.
    # The expression uses Common Expression Language syntax (CEL).
    # Here we block access based on tags.
    #
    # Here, we create a deny rule that denies the cloudresourcemanager.googleapis.com/projects.delete permission to everyone except project-admins@example.com for resources that are tagged test.
    # A tag is a key-value pair that can be attached to an organization, folder, or project.
    # For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
    deny_rule.denial_condition = {
        "expression": "!resource.matchTag('12345678/env', 'test')"
    }

    # Add the deny rule and a description for it.
    policy_rule = types.PolicyRule()
    policy_rule.description = "block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value test"
    policy_rule.deny_rule = deny_rule

    policy = types.Policy()
    policy.display_name = "Restrict project deletion access"
    policy.rules = [policy_rule]

    # Set the policy resource path, policy rules and a unique ID for the policy.
    request = types.CreatePolicyRequest()
    # Construct the full path of the resource's deny policies.
    # Its format is: "policies/{attachmentPoint}/denypolicies"
    request.parent = f"policies/{attachment_point}/denypolicies"
    request.policy = policy
    request.policy_id = policy_id

    # Build the create policy request and wait for the operation to complete.
    result = policies_client.create_policy(request=request).result()
    print(f"Created the deny policy: {result.name.rsplit('/')[-1]}")


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"

    # Test the policy lifecycle.
    create_deny_policy(project_id, policy_id)

REST

The policies.createPolicy method creates a deny policy for a resource.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_ID: An identifier for the deny policy.
  • POLICY_NAME: The display name for the deny policy.

  • DENY_RULE_1, DENY_RULE_2, ...DENY_RULE_N: The deny rules in the policy. Each deny rule can contain these fields:

    • deniedPermissions: A list of permissions that the specified principals cannot use. The permissions must be supported in deny policies.

      In some cases, you can also use permission groups to deny sets of permissions. For more information, see Permission groups.

    • exceptionPermissions: A list of permissions that the specified principals can use, even if those permissions are included in deniedPermissions. For example, you can use this field to make exceptions for specific permissions in a group of permissions.
    • deniedPrincipals: A list of principals that cannot use the specified permissions. Use the v2 API format for principal identifiers.
    • exceptionPrincipals: Optional. A list of principals that can use the specified permissions, even if those principals are included in deniedPrincipals. For example, you can use this field to make an exception for specific users who belong to a denied group. Use the v2 API format for principal identifiers.

    • denialCondition: Optional. A condition expression that specifies when the principals cannot use the permissions. Contains the following fields:

    For examples of deny rules, see Common use cases.

HTTP method and URL: 

POST https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies?policyId=POLICY_ID

Request JSON body: 

{
  "displayName": "POLICY_NAME",
  "rules": [
    {
      "denyRule": DENY_RULE_1
    },
    {
      "denyRule": DENY_RULE_2
    },

    {
      "denyRule": DENY_RULE_N
    }
  ]
}

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy/operations/89cb3e508bf1ff01",
  "metadata": {
    "@type": "type.googleapis.com/google.iam.v2.PolicyOperationMetadata",
    "createTime": "2022-06-28T19:06:12.455151Z"
  },
  "response": {
    "@type": "type.googleapis.com/google.iam.v2.Policy",
    "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
    "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
    "kind": "DenyPolicy",
    "displayName": "My deny policy.",
    "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
    "createTime": "2022-06-28T19:06:12.455151Z",
    "updateTime": "2022-06-28T22:26:21.968687Z"
    "rules": [
      {
        "denyRule": {
          "deniedPrincipals": [
            "principal://goog/subject/lucian@example.com"
          ],
          "deniedPermissions": [
            "iam.googleapis.com/roles.create"
          ]
        }
      }
    ]
  }
}

The response identifies a long-running operation. You can monitor the status of the long-running operation to find out when it's complete. For details, see Check the status of a long-running operation on this page.

List deny policies

A resource can have multiple deny policies. You can list all of the deny policies that are attached to a resource, and then view each deny policy to see the deny rules in each policy.

Console

  1. In the Google Cloud console, go to the Deny tab on the IAM page.

    Go to IAM

  2. Select a project, folder, or organization.

    The Google Cloud console lists all deny policies that apply to that project, folder, or organization. This includes deny policies that have been inherited from other resources. For more information about deny policy inheritance, see Deny policy inheritance.

gcloud

To list the deny policies for a resource, run the gcloud iam policies list command:

gcloud iam policies list \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies \
    --format=json

Provide the following value:

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

For example, the following command lists deny policies attached to an organization whose numeric ID is 123456789012:

gcloud iam policies list \
    --attachment-point=cloudresourcemanager.googleapis.com/organizations/123456789012 \
    --kind=denypolicies \
    --format=json

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"
	"cloud.google.com/go/iam/apiv2/iampb"
	"google.golang.org/api/iterator"
)

// listDenyPolicies lists all the deny policies that are attached to a resource.
// A resource can have up to 5 deny policies.
func listDenyPolicies(w io.Writer, projectID string) error {
	// projectID := "your_project_id"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	req := &iampb.ListPoliciesRequest{
		// Construct the full path of the resource's deny policies.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies"
		Parent: fmt.Sprintf("policies/%s/denypolicies", attachmentPoint),
	}
	it := policiesClient.ListPolicies(ctx, req)
	fmt.Fprintf(w, "Policies found in project %s:\n", projectID)

	for {
		policy, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Fprintf(w, "- %s\n", policy.GetName())
	}
	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.PoliciesClient;
import com.google.iam.v2.Policy;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

public class ListDenyPolicies {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    listDenyPolicies(projectId);
  }

  // List all the deny policies that are attached to a resource.
  // A resource can have up to 5 deny policies.
  public static void listDenyPolicies(String projectId) throws IOException {
    // Initialize the Policies client.
    try (PoliciesClient policiesClient = PoliciesClient.create()) {

      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached.
      // Its format is: "policies/{attachmentPoint}/denypolicies"
      String policyParent = String.format("policies/%s/denypolicies", attachmentPoint);

      // Create a list request and iterate over the returned policies.
      for (Policy policy : policiesClient.listPolicies(policyParent).iterateAll()) {
        System.out.println(policy.getName());
      }
      System.out.println("Listed all deny policies");
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

async function listDenyPolicies() {
  const request = {
    parent: `policies/${attachmentPoint}/denypolicies`,
  };

  const policies = await iamClient.listPoliciesAsync(request);
  for await (const policy of policies) {
    console.log(`- ${policy.name}`);
  }
}

listDenyPolicies();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

def list_deny_policy(project_id: str) -> None:
    from google.cloud import iam_v2
    from google.cloud.iam_v2 import types

    """
    List all the deny policies that are attached to a resource.
    A resource can have up to 5 deny policies.

    project_id: ID or number of the Google Cloud project you want to use.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    request = types.ListPoliciesRequest()
    # Construct the full path of the resource's deny policies.
    # Its format is: "policies/{attachmentPoint}/denypolicies"
    request.parent = f"policies/{attachment_point}/denypolicies"

    # Create a list request and iterate over the returned policies.
    policies = policies_client.list_policies(request=request)

    for policy in policies:
        print(policy.name)
    print("Listed all deny policies")


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"

    list_deny_policy(project_id)

REST

The policies.listPolicies method lists the deny policies for a resource.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

HTTP method and URL: 

GET https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "policies": [
    {
      "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1067607927478/denypolicies/test-policy",
      "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
      "kind": "DenyPolicy",
      "displayName": "My deny policy.",
      "createTime": "2022-06-28T19:06:12.455151Z",
      "updateTime": "2022-06-28T22:26:21.968687Z"
    },
    {
      "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1067607927478/denypolicies/test-policy-2",
      "uid": "8465d710-ea20-0a08-d92c-b2a3ebf766ab",
      "kind": "DenyPolicy",
      "displayName": "My second deny policy.",
      "createTime": "2022-06-05T19:21:53.595455Z",
      "updateTime": "2022-06-05T19:21:53.595455Z"
    },
    {
      "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1067607927478/denypolicies/test-policy-3",
      "uid": "ee9f7c2f-7e8c-b05c-d4e5-e03bfb2954e0",
      "kind": "DenyPolicy",
      "displayName": "My third deny policy.",
      "createTime": "2022-06-05T19:22:26.770543Z",
      "updateTime": "2022-06-05T19:22:26.770543Z"
    }
  ]
}

View a deny policy

You can view a deny policy to see the deny rules that it contains, including the permissions that are denied and the principals who cannot use those permissions.

Console

  1. In the Google Cloud console, go to the Deny tab on the IAM page.

    Go to IAM

  2. Select a project, folder, or organization.

  3. In the Policy ID column, click the ID of the policy that you want to view.

    The Google Cloud console shows the details of the deny policy, including the policy ID, when the policy was created, and the deny rules in the deny policy.

gcloud

To get the deny policy for a resource, run the gcloud iam policies get command:

gcloud iam policies get POLICY_ID \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies \
    --format=json

Provide the following values:

  • POLICY_ID: The identifier for the deny policy.

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

For example, the following command gets the deny policy named my-deny-policy for the project my-project and saves it in a file named policy.json:

gcloud iam policies get my-deny-policy \
    --attachment-point=cloudresourcemanager.googleapis.com/projects/my-project \
    --kind=denypolicies \
    --format=json \
    > ./policy.json

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"
	"cloud.google.com/go/iam/apiv2/iampb"
)

// getDenyPolicy retrieves the deny policy given the project ID and policy ID.
func getDenyPolicy(w io.Writer, projectID, policyID string) error {
	// projectID := "your_project_id"
	// policyID := "your_policy_id"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	req := &iampb.GetPolicyRequest{
		// Construct the full path of the policy.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies/POLICY_ID"
		Name: fmt.Sprintf("policies/%s/denypolicies/%s", attachmentPoint, policyID),
	}
	policy, err := policiesClient.GetPolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to get policy: %w", err)
	}

	fmt.Fprintf(w, "Policy %s retrieved\n", policy.GetName())

	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.GetPolicyRequest;
import com.google.iam.v2.PoliciesClient;
import com.google.iam.v2.Policy;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

public class GetDenyPolicy {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.

    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    // Specify the ID of the deny policy you want to retrieve.
    String policyId = "deny-policy-id";

    getDenyPolicy(projectId, policyId);
  }

  // Retrieve the deny policy given the project ID and policy ID.
  public static void getDenyPolicy(String projectId, String policyId) throws IOException {
    // Create the IAM Policies client.
    try (PoliciesClient policiesClient = PoliciesClient.create()) {

      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached.
      // Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
      String policyParent = String.format("policies/%s/denypolicies/%s", attachmentPoint, policyId);

      // Specify the policyParent and execute the GetPolicy request.
      GetPolicyRequest getPolicyRequest =
          GetPolicyRequest.newBuilder().setName(policyParent).build();

      Policy policy = policiesClient.getPolicy(getPolicyRequest);
      System.out.printf("Retrieved the deny policy: %s : %s%n", policyId, policy);
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const policyID = 'YOUR_POLICY_ID';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

async function getDenyPolicy() {
  const request = {
    name: `policies/${attachmentPoint}/denypolicies/${policyId}`,
  };

  const [policy] = await iamClient.getPolicy(request);

  console.log(`Retrieved the deny policy: ${policy.name}`);
}

getDenyPolicy();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

from google.cloud import iam_v2
from google.cloud.iam_v2 import Policy, types


def get_deny_policy(project_id: str, policy_id: str) -> Policy:
    """
    Retrieve the deny policy given the project ID and policy ID.

    project_id: ID or number of the Google Cloud project you want to use.
    policy_id: The ID of the deny policy you want to retrieve.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    request = types.GetPolicyRequest()
    # Construct the full path of the policy.
    # Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
    request.name = f"policies/{attachment_point}/denypolicies/{policy_id}"

    # Execute the GetPolicy request.
    policy = policies_client.get_policy(request=request)
    print(f"Retrieved the deny policy: {policy_id} : {policy}")
    return policy


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"

    policy = get_deny_policy(project_id, policy_id)

REST

The policies.get method gets a deny policy for a resource.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_ID: An identifier for the deny policy.

HTTP method and URL: 

GET https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies/POLICY_ID

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
  "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
  "kind": "DenyPolicy",
  "displayName": "My deny policy.",
  "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
  "createTime": "2022-06-05T19:22:26.770543Z",
  "updateTime": "2022-06-05T19:22:26.770543Z",
  "rules": [
    {
      "denyRule": {
        "deniedPrincipals": [
          "principal://goog/subject/lucian@example.com"
        ],
        "deniedPermissions": [
          "iam.googleapis.com/roles.create"
        ]
      }
    }
  ]
}

Update a deny policy

After you create a deny policy, you can update the deny rules that it contains, as well as its display name.

You can update a deny policy using the Google Cloud console, or using one of the following programmatic methods:

  • The gcloud CLI
  • The REST API
  • The IAM client libraries

Update a deny policy using the Google Cloud console

  1. In the Google Cloud console, go to the Deny tab on the IAM page.

    Go to IAM

  2. Select a project, folder, or organization.

  3. In the Policy ID column, click the ID of the policy that you want to edit.

  4. Click Edit.

  5. Update the deny policy:

    • To change the policy display name, edit the Display name field.
    • To edit an existing deny rule, click the deny rule, and then modify the rule's principals, exception principals, denied permissions, exception permissions, or denial condition.
    • To remove a deny rule, find the deny rule that you want to delete, and then click Delete in that row.
    • To add a deny rule, click Add deny rule, and then create a deny rule like you do when you create a deny policy.

  6. When you're done updating the deny policy, click Save.

Update a deny policy programmatically

To update a deny policy using the gcloud CLI, the REST API, or the IAM client libraries, use the read-modify-write pattern:

  1. Read the current version of the policy.
  2. Modify the information in the policy as needed.
  3. Write the updated policy.

Read the deny policy

gcloud

To get the deny policy for a resource, run the gcloud iam policies get command:

gcloud iam policies get POLICY_ID \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies \
    --format=json

Provide the following values:

  • POLICY_ID: The identifier for the deny policy.

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

For example, the following command gets the deny policy named my-deny-policy for the project my-project and saves it in a file named policy.json:

gcloud iam policies get my-deny-policy \
    --attachment-point=cloudresourcemanager.googleapis.com/projects/my-project \
    --kind=denypolicies \
    --format=json \
    > ./policy.json

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"
	"cloud.google.com/go/iam/apiv2/iampb"
)

// getDenyPolicy retrieves the deny policy given the project ID and policy ID.
func getDenyPolicy(w io.Writer, projectID, policyID string) error {
	// projectID := "your_project_id"
	// policyID := "your_policy_id"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	req := &iampb.GetPolicyRequest{
		// Construct the full path of the policy.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies/POLICY_ID"
		Name: fmt.Sprintf("policies/%s/denypolicies/%s", attachmentPoint, policyID),
	}
	policy, err := policiesClient.GetPolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to get policy: %w", err)
	}

	fmt.Fprintf(w, "Policy %s retrieved\n", policy.GetName())

	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.GetPolicyRequest;
import com.google.iam.v2.PoliciesClient;
import com.google.iam.v2.Policy;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

public class GetDenyPolicy {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.

    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    // Specify the ID of the deny policy you want to retrieve.
    String policyId = "deny-policy-id";

    getDenyPolicy(projectId, policyId);
  }

  // Retrieve the deny policy given the project ID and policy ID.
  public static void getDenyPolicy(String projectId, String policyId) throws IOException {
    // Create the IAM Policies client.
    try (PoliciesClient policiesClient = PoliciesClient.create()) {

      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached.
      // Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
      String policyParent = String.format("policies/%s/denypolicies/%s", attachmentPoint, policyId);

      // Specify the policyParent and execute the GetPolicy request.
      GetPolicyRequest getPolicyRequest =
          GetPolicyRequest.newBuilder().setName(policyParent).build();

      Policy policy = policiesClient.getPolicy(getPolicyRequest);
      System.out.printf("Retrieved the deny policy: %s : %s%n", policyId, policy);
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const policyID = 'YOUR_POLICY_ID';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

async function getDenyPolicy() {
  const request = {
    name: `policies/${attachmentPoint}/denypolicies/${policyId}`,
  };

  const [policy] = await iamClient.getPolicy(request);

  console.log(`Retrieved the deny policy: ${policy.name}`);
}

getDenyPolicy();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

from google.cloud import iam_v2
from google.cloud.iam_v2 import Policy, types


def get_deny_policy(project_id: str, policy_id: str) -> Policy:
    """
    Retrieve the deny policy given the project ID and policy ID.

    project_id: ID or number of the Google Cloud project you want to use.
    policy_id: The ID of the deny policy you want to retrieve.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    request = types.GetPolicyRequest()
    # Construct the full path of the policy.
    # Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
    request.name = f"policies/{attachment_point}/denypolicies/{policy_id}"

    # Execute the GetPolicy request.
    policy = policies_client.get_policy(request=request)
    print(f"Retrieved the deny policy: {policy_id} : {policy}")
    return policy


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"

    policy = get_deny_policy(project_id, policy_id)

REST

The policies.get method gets a deny policy for a resource.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_ID: An identifier for the deny policy.

HTTP method and URL: 

GET https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies/POLICY_ID

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
  "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
  "kind": "DenyPolicy",
  "displayName": "My deny policy.",
  "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
  "createTime": "2022-06-05T19:22:26.770543Z",
  "updateTime": "2022-06-05T19:22:26.770543Z",
  "rules": [
    {
      "denyRule": {
        "deniedPrincipals": [
          "principal://goog/subject/lucian@example.com"
        ],
        "deniedPermissions": [
          "iam.googleapis.com/roles.create"
        ]
      }
    }
  ]
}

Modify the deny policy

To modify the deny policy, you make changes to the copy of the policy that you previously read from IAM. You can update the display name, or you can add, change, or remove deny rules. The changes don't take effect until you write the updated policy.

For example, you could add a permission to an existing deny rule:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
  "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
  "kind": "DenyPolicy",
  "displayName": "My deny policy.",
  "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
  "createTime": "2021-10-05T19:22:26.770543Z",
  "updateTime": "2021-10-05T19:22:26.770543Z",
  "rules": [
    {
      "denyRule": {
        "deniedPrincipals": [
          "principal://goog/subject/lucian@example.com"
        ],
        "deniedPermissions": [
          "iam.googleapis.com/roles.create",
          "iam.googleapis.com/roles.delete"
        ]
      }
    }
  ]
}

Write the updated deny policy

After you modify the deny policy locally, you must write the updated deny policy to IAM.

Each deny policy contains an etag field that identifies the policy version. The etag changes each time you update the policy. When you write the updated policy, the etag in your request must match the current etag stored in IAM; if the values do not match, the request fails. This feature helps prevent concurrent changes from overwriting each other.

gcloud

To update the deny policy for a resource, run the gcloud iam policies update command:

gcloud iam policies update POLICY_ID \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies \
    --policy-file=POLICY_FILE

Provide the following values:

  • POLICY_ID: The identifier for the deny policy.

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_FILE: The filepath for the JSON file that contains the deny policy.

By default, if this command succeeds, it does not print any output. To print a detailed response, add the flag --format=json to the command.

For example, the following command updates a deny policy named my-deny-policy for the project my-project, using a file named policy.json:

gcloud iam policies update my-deny-policy \
    --attachment-point=cloudresourcemanager.googleapis.com/projects/my-project \
    --kind=denypolicies \
    --policy-file=policy.json

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"

	"cloud.google.com/go/iam/apiv2/iampb"
	"google.golang.org/genproto/googleapis/type/expr"
)

// updateDenyPolicy updates the deny rules and/ or its display name after policy creation.
func updateDenyPolicy(w io.Writer, projectID, policyID, etag string) error {
	// projectID := "your_project_id"
	// policyID := "your_policy_id"
	// etag := "your_etag"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	denyRule := &iampb.DenyRule{
		// Add one or more principals who should be denied the permissions specified in this rule.
		// For more information on allowed values,
		// see: https://cloud.google.com/iam/help/deny/principal-identifiers
		DeniedPrincipals: []string{"principalSet://goog/public:all"},
		// Optionally, set the principals who should be exempted from the
		// list of denied principals. For example, if you want to deny certain permissions
		// to a group but exempt a few principals, then add those here.
		// ExceptionPrincipals: []string{"principalSet://goog/group/project-admins@example.com"},
		//
		// Set the permissions to deny.
		// The permission value is of the format: service_fqdn/resource.action
		// For the list of supported permissions,
		// see: https://cloud.google.com/iam/help/deny/supported-permissions
		DeniedPermissions: []string{"cloudresourcemanager.googleapis.com/projects.delete"},
		// Optionally, add the permissions to be exempted from this rule.
		// Meaning, the deny rule will not be applicable to these permissions.
		// ExceptionPermissions: []string{"cloudresourcemanager.googleapis.com/projects.create"},
		//
		// Set the condition which will enforce the deny rule.
		// If this condition is true, the deny rule will be applicable.
		// Else, the rule will not be enforced.
		// The expression uses Common Expression Language syntax (CEL).
		// Here we block access based on tags.
		//
		// Here, we create a deny rule that denies the
		// cloudresourcemanager.googleapis.com/projects.delete permission
		// to everyone except project-admins@example.com for resources that are tagged prod.
		// A tag is a key-value pair that can be attached to an organization, folder, or project.
		// For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
		DenialCondition: &expr.Expr{
			Expression: "!resource.matchTag('12345678/env', 'prod')",
		},
	}

	// Set the rule description and deny rule to update.
	policyRule := &iampb.PolicyRule{
		Description: "block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value prod",
		Kind: &iampb.PolicyRule_DenyRule{
			DenyRule: denyRule,
		},
	}

	// Set the policy resource path, version (etag) and the updated deny rules.
	policy := &iampb.Policy{
		// Construct the full path of the policy.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies/POLICY_ID"
		Name:  fmt.Sprintf("policies/%s/denypolicies/%s", attachmentPoint, policyID),
		Etag:  etag,
		Rules: [](*iampb.PolicyRule){policyRule},
	}

	// Create the update policy request.
	req := &iampb.UpdatePolicyRequest{
		Policy: policy,
	}
	op, err := policiesClient.UpdatePolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to update policy: %w", err)
	}

	policy, err = op.Wait(ctx)
	if err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Policy %s updated\n", policy.GetName())

	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.DenyRule;
import com.google.iam.v2.PoliciesClient;
import com.google.iam.v2.Policy;
import com.google.iam.v2.PolicyRule;
import com.google.iam.v2.UpdatePolicyRequest;
import com.google.longrunning.Operation;
import com.google.type.Expr;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class UpdateDenyPolicy {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    // Specify the ID of the Deny policy you want to retrieve.
    String policyId = "deny-policy-id";

    // Etag field that identifies the policy version. The etag changes each time
    // you update the policy. Get the etag of an existing policy by performing a GetPolicy request.
    String etag = "policy_etag";

    updateDenyPolicy(projectId, policyId, etag);
  }

  // Update the deny rules and/ or its display name after policy creation.
  public static void updateDenyPolicy(String projectId, String policyId, String etag)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    try (PoliciesClient policiesClient = PoliciesClient.create()) {

      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached to.
      // Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
      String policyParent = String.format("policies/%s/denypolicies/%s", attachmentPoint, policyId);

      DenyRule denyRule =
          DenyRule.newBuilder()
              // Add one or more principals who should be denied the permissions specified in this
              // rule.
              // For more information on allowed values, see:
              // https://cloud.google.com/iam/docs/principal-identifiers
              .addDeniedPrincipals("principalSet://goog/public:all")

              // Optionally, set the principals who should be exempted from the list of principals
              // added in "DeniedPrincipals".
              // Example, if you want to deny certain permissions to a group but exempt a few
              // principals, then add those here.
              // .addExceptionPrincipals(
              //     "principalSet://goog/group/project-admins@example.com")

              // Set the permissions to deny.
              // The permission value is of the format: service_fqdn/resource.action
              // For the list of supported permissions, see:
              // https://cloud.google.com/iam/help/deny/supported-permissions
              .addDeniedPermissions("cloudresourcemanager.googleapis.com/projects.delete")

              // Add the permissions to be exempted from this rule.
              // Meaning, the deny rule will not be applicable to these permissions.
              // .addExceptionPermissions("cloudresourcemanager.googleapis.com/projects.get")

              // Set the condition which will enforce the deny rule.
              // If this condition is true, the deny rule will be applicable. Else, the rule will
              // not be enforced.
              .setDenialCondition(
                  Expr.newBuilder()
                      // The expression uses Common Expression Language syntax (CEL). Here we block
                      // access based on tags.
                      //
                      // A tag is a key-value pair that can be attached to an organization, folder,
                      // or project. You can use deny policies to deny permissions based on tags
                      // without adding an IAM Condition to every role grant.
                      // For example, imagine that you tag all of your projects as dev, test, or
                      // prod. You want only members of project-admins@example.com to be able to
                      // perform operations on projects that are tagged prod.
                      // To solve this problem, you create a deny rule that denies the
                      // cloudresourcemanager.googleapis.com/projects.delete permission to everyone
                      // except project-admins@example.com for resources that are tagged prod.
                      .setExpression("!resource.matchTag('12345678/env', 'prod')")
                      .setTitle("Only for prod projects")
                      .build())
              .build();

      // Set the policy resource path, version (etag) and the updated deny rules.
      Policy policy =
          Policy.newBuilder()
              .setName(policyParent)
              .setEtag(etag)
              .addRules(
                  PolicyRule.newBuilder()
                      // Set the rule description to update.
                      .setDescription(
                          "Block all principals from deleting projects, unless the principal"
                              + " is a member of project-admins@example.com and the project"
                              + "being deleted has a tag with the value prod")
                      // Set the deny rule to update.
                      .setDenyRule(denyRule)
                      .build())
              .build();

      // Create the update policy request.
      UpdatePolicyRequest updatePolicyRequest =
          UpdatePolicyRequest.newBuilder().setPolicy(policy).build();

      // Wait for the operation to complete.
      Operation operation =
          policiesClient
              .updatePolicyCallable()
              .futureCall(updatePolicyRequest)
              .get(3, TimeUnit.MINUTES);

      if (operation.hasError()) {
        System.out.println("Error in updating the policy " + operation.getError());
        return;
      }

      System.out.println("Updated the deny policy: " + policyId);
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const policyID = 'YOUR_POLICY_ID';
// const etag = 'YOUR_ETAG';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

const denyRule = {
  // Add one or more principals who should be denied the permissions specified in this rule.
  // For more information on allowed values, see: https://cloud.google.com/iam/help/deny/principal-identifiers
  deniedPrincipals: ['principalSet://goog/public:all'],
  // Optionally, set the principals who should be exempted from the
  // list of denied principals. For example, if you want to deny certain permissions
  // to a group but exempt a few principals, then add those here.
  // exceptionPrincipals: ['principalSet://goog/group/project-admins@example.com'],
  // Set the permissions to deny.
  // The permission value is of the format: service_fqdn/resource.action
  // For the list of supported permissions, see: https://cloud.google.com/iam/help/deny/supported-permissions
  deniedPermissions: ['cloudresourcemanager.googleapis.com/projects.delete'],
  // Optionally, add the permissions to be exempted from this rule.
  // Meaning, the deny rule will not be applicable to these permissions.
  // exceptionPermissions: ['cloudresourcemanager.googleapis.com/projects.create']
  //
  // Set the condition which will enforce the deny rule.
  // If this condition is true, the deny rule will be applicable. Else, the rule will not be enforced.
  // The expression uses Common Expression Language syntax (CEL).
  // Here we block access based on tags.
  //
  // Here, we create a deny rule that denies the cloudresourcemanager.googleapis.com/projects.delete permission to everyone except project-admins@example.com for resources that are tagged test.
  // A tag is a key-value pair that can be attached to an organization, folder, or project.
  // For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
  denialCondition: {
    expression: '!resource.matchTag("12345678/env", "prod")',
  },
};

async function updateDenyPolicy() {
  const request = {
    policy: {
      name: `policies/${attachmentPoint}/denypolicies/${policyId}`,
      etag,
      rules: [
        {
          description:
            'block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value prod',
          denyRule,
        },
      ],
    },
    policyId,
  };

  const [operation] = await iamClient.updatePolicy(request);
  const [policy] = await operation.promise();

  console.log(`Updated the deny policy: ${policy.name}`);
}

updateDenyPolicy();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

def update_deny_policy(project_id: str, policy_id: str, etag: str) -> None:
    from google.cloud import iam_v2
    from google.cloud.iam_v2 import types

    """
    Update the deny rules and/ or its display name after policy creation.

    project_id: ID or number of the Google Cloud project you want to use.

    policy_id: The ID of the deny policy you want to retrieve.

    etag: Etag field that identifies the policy version. The etag changes each time
    you update the policy. Get the etag of an existing policy by performing a GetPolicy request.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    deny_rule = types.DenyRule()

    # Add one or more principals who should be denied the permissions specified in this rule.
    # For more information on allowed values, see: https://cloud.google.com/iam/help/deny/principal-identifiers
    deny_rule.denied_principals = ["principalSet://goog/public:all"]

    # Optionally, set the principals who should be exempted from the list of principals added in "DeniedPrincipals".
    # Example, if you want to deny certain permissions to a group but exempt a few principals, then add those here.
    # deny_rule.exception_principals = ["principalSet://goog/group/project-admins@example.com"]

    # Set the permissions to deny.
    # The permission value is of the format: service_fqdn/resource.action
    # For the list of supported permissions, see: https://cloud.google.com/iam/help/deny/supported-permissions
    deny_rule.denied_permissions = [
        "cloudresourcemanager.googleapis.com/projects.delete"
    ]

    # Add the permissions to be exempted from this rule.
    # Meaning, the deny rule will not be applicable to these permissions.
    # deny_rule.exception_permissions = ["cloudresourcemanager.googleapis.com/projects.get"]

    # Set the condition which will enforce the deny rule.
    # If this condition is true, the deny rule will be applicable. Else, the rule will not be enforced.
    #
    # The expression uses Common Expression Language syntax (CEL). Here we block access based on tags.
    #
    # Here, we create a deny rule that denies the cloudresourcemanager.googleapis.com/projects.delete permission to everyone except project-admins@example.com for resources that are tagged prod.
    # A tag is a key-value pair that can be attached to an organization, folder, or project.
    # For more info, see: https://cloud.google.com/iam/docs/deny-access#create-deny-policy
    deny_rule.denial_condition = {
        "expression": "!resource.matchTag('12345678/env', 'prod')"
    }

    # Set the rule description and deny rule to update.
    policy_rule = types.PolicyRule()
    policy_rule.description = "block all principals from deleting projects, unless the principal is a member of project-admins@example.com and the project being deleted has a tag with the value prod"
    policy_rule.deny_rule = deny_rule

    # Set the policy resource path, version (etag) and the updated deny rules.
    policy = types.Policy()
    # Construct the full path of the policy.
    # Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
    policy.name = f"policies/{attachment_point}/denypolicies/{policy_id}"
    policy.etag = etag
    policy.rules = [policy_rule]

    # Create the update policy request.
    request = types.UpdatePolicyRequest()
    request.policy = policy

    result = policies_client.update_policy(request=request).result()
    print(f"Updated the deny policy: {result.name.rsplit('/')[-1]}")


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"
    # Get the etag by performing a Get policy request.
    etag = "etag"

    update_deny_policy(project_id, policy_id, etag)

REST

The policies.update method updates a deny policy.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_ID: An identifier for the deny policy.

  • POLICY: The updated deny policy.

    For example, to add a permission to the policy shown in the previous step, replace POLICY with the following: 

    {
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
  "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
  "kind": "DenyPolicy",
  "displayName": "My deny policy.",
  "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
  "createTime": "2022-06-05T19:22:26.770543Z",
  "updateTime": "2022-06-05T19:22:26.770543Z",
  "rules": [
    {
      "denyRule": {
        "deniedPrincipals": [
          "principal://goog/subject/lucian@example.com"
        ],
        "deniedPermissions": [
          "iam.googleapis.com/roles.create",
          "iam.googleapis.com/roles.delete"
        ]
      }
    }
  ]
}

HTTP method and URL: 

PUT https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies/POLICY_ID

Request JSON body: 

POLICY

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy/operations/8b2d0ab2daf1ff01",
  "metadata": {
    "@type": "type.googleapis.com/google.iam.v2.PolicyOperationMetadata",
    "createTime": "2021-10-05T22:26:21.968687Z"
  },
  "response": {
    "@type": "type.googleapis.com/google.iam.v2.Policy",
    "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
    "uid": "6665c437-a3b2-a018-6934-54dd16d3426e",
    "kind": "DenyPolicy",
    "displayName": "My deny policy.",
    "etag": "MTgxNTIxNDE3NTYxNjQxODYxMTI=",
    "createTime": "2022-06-05T19:22:26.770543Z",
    "updateTime": "2022-06-05T22:26:21.968687Z",
    "rules": [
      {
        "denyRule": {
          "deniedPrincipals": [
            "principal://goog/subject/lucian@example.com"
          ],
          "deniedPermissions": [
            "iam.googleapis.com/roles.create",
            "iam.googleapis.com/roles.delete"
          ]
        }
      }
    ]
  }
}

The response identifies a long-running operation. You can monitor the status of the long-running operation to find out when it's complete. For details, see Check the status of a long-running operation on this page.

Delete a deny policy

If you no longer want to enforce the rules in a deny policy, you can delete the deny policy.

Optionally, you can specify the etag for the policy version that you are deleting. If you specify the etag, it must match the current etag stored by IAM; if the values do not match, the request fails. You can use this feature to ensure that you are deleting the intended policy, rather than an updated version of that policy.

If you omit the etag from the request, IAM deletes the policy unconditionally.

Console

  1. In the Google Cloud console, go to the Deny tab on the IAM page.

    Go to IAM

  2. Select a project, folder, or organization.

  3. In the Policy ID column, click the ID of the policy that you want to delete.

  4. Click Delete. In the confirmation dialog, click Confirm.

gcloud

To delete a deny policy from a resource, run the gcloud iam policies delete command:

gcloud iam policies delete POLICY_ID \
    --attachment-point=ATTACHMENT_POINT \
    --kind=denypolicies

Provide the following values:

  • POLICY_ID: The identifier for the deny policy.

  • ATTACHMENT_POINT: An identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

Optionally, you can add the flag --etag=ETAG. Replace ETAG with the current etag value for the deny policy.

By default, if this command succeeds, it does not print any output. To print a detailed response, add the flag --format=json to the command.

For example, the following command deletes a deny policy named my-deny-policy from the project my-project:

gcloud iam policies delete my-deny-policy \
    --attachment-point=cloudresourcemanager.googleapis.com/projects/my-project \
    --kind=denypolicies

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv2"

	"cloud.google.com/go/iam/apiv2/iampb"
)

// deleteDenyPolicy deletes the policy if you no longer want to enforce the rules in a deny policy.
func deleteDenyPolicy(w io.Writer, projectID, policyID string) error {
	// projectID := "your_project_id"
	// policyID := "your_policy_id"

	ctx := context.Background()
	policiesClient, err := iam.NewPoliciesClient(ctx)
	if err != nil {
		return fmt.Errorf("NewPoliciesClient: %w", err)
	}
	defer policiesClient.Close()

	// Each deny policy is attached to an organization, folder, or project.
	// To work with deny policies, specify the attachment point.
	//
	// Its format can be one of the following:
	// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
	// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
	// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
	//
	// The attachment point is identified by its URL-encoded resource name. Hence, replace
	// the "/" with "%%2F".
	attachmentPoint := fmt.Sprintf(
		"cloudresourcemanager.googleapis.com%%2Fprojects%%2F%s",
		projectID,
	)

	req := &iampb.DeletePolicyRequest{
		// Construct the full path of the policy.
		// Its format is: "policies/ATTACHMENT_POINT/denypolicies/POLICY_ID"
		Name: fmt.Sprintf("policies/%s/denypolicies/%s", attachmentPoint, policyID),
	}
	op, err := policiesClient.DeletePolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to delete policy: %w", err)
	}

	policy, err := op.Wait(ctx)
	if err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Policy %s deleted\n", policy.GetName())

	return nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 


import com.google.iam.v2.DeletePolicyRequest;
import com.google.iam.v2.PoliciesClient;
import com.google.longrunning.Operation;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class DeleteDenyPolicy {

  public static void main(String[] args)
      throws IOException, InterruptedException, ExecutionException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // ID or number of the Google Cloud project you want to use.
    String projectId = "your-google-cloud-project-id";

    // Specify the ID of the deny policy you want to retrieve.
    String policyId = "deny-policy-id";

    deleteDenyPolicy(projectId, policyId);
  }

  // Delete the policy if you no longer want to enforce the rules in a deny policy.
  public static void deleteDenyPolicy(String projectId, String policyId)
      throws IOException, InterruptedException, ExecutionException, TimeoutException {
    try (PoliciesClient policiesClient = PoliciesClient.create()) {

      // Each deny policy is attached to an organization, folder, or project.
      // To work with deny policies, specify the attachment point.
      //
      // Its format can be one of the following:
      // 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
      // 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
      // 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
      //
      // The attachment point is identified by its URL-encoded resource name.
      String urlEncodedResource =
          URLEncoder.encode(
              "cloudresourcemanager.googleapis.com/projects/", StandardCharsets.UTF_8);
      String attachmentPoint = String.format("%s%s", urlEncodedResource, projectId);

      // Construct the full path of the resource to which the policy is attached.
      // Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
      String policyParent = String.format("policies/%s/denypolicies/%s", attachmentPoint, policyId);

      // Create the DeletePolicy request.
      DeletePolicyRequest deletePolicyRequest =
          DeletePolicyRequest.newBuilder().setName(policyParent).build();

      // Delete the policy and wait for the operation to complete.
      Operation operation =
          policiesClient
              .deletePolicyCallable()
              .futureCall(deletePolicyRequest)
              .get(3, TimeUnit.MINUTES);

      if (operation.hasError()) {
        System.out.println("Error in deleting the policy " + operation.getError());
        return;
      }

      System.out.println("Deleted the deny policy: " + policyId);
    }
  }
}

Node.js

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Node.js API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const policyID = 'YOUR_POLICY_ID';

const {PoliciesClient} = require('@google-cloud/iam').v2;

const iamClient = new PoliciesClient();

// Each deny policy is attached to an organization, folder, or project.
// To work with deny policies, specify the attachment point.
//
// Its format can be one of the following:
// 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
// 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
// 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
//
// The attachment point is identified by its URL-encoded resource name. Hence, replace
// the "/" with "%2F".
const attachmentPoint = `cloudresourcemanager.googleapis.com%2Fprojects%2F${projectId}`;

async function deleteDenyPolicy() {
  const request = {
    name: `policies/${attachmentPoint}/denypolicies/${policyId}`,
  };

  const [operation] = await iamClient.deletePolicy(request);
  const [policy] = await operation.promise();

  console.log(`Deleted the deny policy: ${policy.name}`);
}

deleteDenyPolicy();

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Before you begin. 

def delete_deny_policy(project_id: str, policy_id: str) -> None:
    from google.cloud import iam_v2
    from google.cloud.iam_v2 import types

    """
    Delete the policy if you no longer want to enforce the rules in a deny policy.

    project_id: ID or number of the Google Cloud project you want to use.
    policy_id: The ID of the deny policy you want to retrieve.
    """
    policies_client = iam_v2.PoliciesClient()

    # Each deny policy is attached to an organization, folder, or project.
    # To work with deny policies, specify the attachment point.
    #
    # Its format can be one of the following:
    # 1. cloudresourcemanager.googleapis.com/organizations/ORG_ID
    # 2. cloudresourcemanager.googleapis.com/folders/FOLDER_ID
    # 3. cloudresourcemanager.googleapis.com/projects/PROJECT_ID
    #
    # The attachment point is identified by its URL-encoded resource name. Hence, replace
    # the "/" with "%2F".
    attachment_point = f"cloudresourcemanager.googleapis.com%2Fprojects%2F{project_id}"

    request = types.DeletePolicyRequest()
    # Construct the full path of the policy.
    # Its format is: "policies/{attachmentPoint}/denypolicies/{policyId}"
    request.name = f"policies/{attachment_point}/denypolicies/{policy_id}"

    # Create the DeletePolicy request.
    result = policies_client.delete_policy(request=request).result()
    print(f"Deleted the deny policy: {result.name.rsplit('/')[-1]}")


if __name__ == "__main__":
    import uuid

    # Your Google Cloud project ID.
    project_id = "your-google-cloud-project-id"
    # Any unique ID (0 to 63 chars) starting with a lowercase letter.
    policy_id = f"deny-{uuid.uuid4()}"

    delete_deny_policy(project_id, policy_id)

REST

The policies.delete method deletes a deny policy from a resource.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • POLICY_ID: An identifier for the deny policy.
  • ETAG: Optional. An identifier for the version of the policy. If present, this value must match the current etag value for the policy.

HTTP method and URL: 

DELETE https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/denypolicies/POLICY_ID?etag=ETAG

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy/operations/8223fe308bf1ff01",
  "metadata": {
    "@type": "type.googleapis.com/google.iam.v2.PolicyOperationMetadata",
    "createTime": "2021-10-05T19:45:00.133311Z"
  },
  "response": {
    "@type": "type.googleapis.com/google.iam.v2.Policy",
    "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy",
    "kind": "DenyPolicy",
    "displayName": "My deny policy.",
    "etag": "MTc3NDU4MjM4OTY0MzU5MjQ5OTI=",
    "createTime": "2022-06-28T19:06:12.455151Z",
    "updateTime": "2022-07-05T19:45:00.133311Z",
    "deleteTime": "2022-07-05T19:45:00.133311Z",
    "rules": [
      {
        "denyRule": {
          "deniedPrincipals": [
            "principal://goog/subject/lucian@example.com"
          ],
          "deniedPermissions": [
            "iam.googleapis.com/roles.create"
          ]
        }
      }
    ]
  }
}

The response identifies a long-running operation. You can monitor the status of the long-running operation to find out when it's complete. For details, see Check the status of a long-running operation on this page.

Check the status of a long-running operation

When you use the REST API or the client libraries, any method that changes a deny policy returns a long-running operation, or LRO. The long-running operation tracks the status of the request and indicates whether the change to the policy is complete.

Go

The code samples on this page show how to wait for a long-running operation to finish, and then access its result.

Java

The code samples on this page show how to wait for a long-running operation to finish, and then access its result.

Node.js

The code samples on this page show how to wait for a long-running operation to finish, and then access its result.

Python

The code samples on this page show how to wait for a long-running operation to finish, and then access its result.

REST

The policies.operations.get method returns the status of a long-running operation.

Before using any of the request data, make the following replacements:

  • ENCODED_ATTACHMENT_POINT: A URL-encoded identifier for the resource that the deny policy is attached to. To learn how to format this value, see Attachment point.

  • OPERATION_ID: The identifier for the operation. You receive this identifier in the response to your original request, as part of the operation name. Use the hexadecimal value at the end of the operation name. For example, 89cb3e508bf1ff01.

HTTP method and URL: 

GET https://iam.googleapis.com/v2/policies/ENCODED_ATTACHMENT_POINT/operations/OPERATION_ID

To send your request, expand one of these options:

You should receive a JSON response similar to the following:

{
  "name": "policies/cloudresourcemanager.googleapis.com%2Fprojects%2F1234567890123/denypolicies/my-policy/operations/89cb3e508bf1ff01",
  "done": true
}

If the operation's done field is not present, continue to monitor its status by getting the operation repeatedly. Use truncated exponential backoff to introduce a delay between each request. When the done field is set to true, the operation is complete, and you can stop getting the operation.

What's next