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Añadir vinculaciones de roles condicionales

Ejemplo de cómo definir una condición startsWith con las bibliotecas de cliente.

Investigar más

Para obtener documentación detallada que incluya este código de muestra, consulta lo siguiente:

Definir y gestionar políticas de gestión de identidades y accesos en los contenedores

Código de ejemplo

C++

Para obtener más información, consulta la documentación de referencia de la API C++ de Cloud Storage.

Para autenticarte en Cloud Storage, configura las credenciales predeterminadas de la aplicación. Para obtener más información, consulta el artículo Configurar la autenticación para bibliotecas de cliente.

//! [native add bucket conditional iam binding]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
   std::string const& role, std::string const& member,
   std::string const& condition_title,
   std::string const& condition_description,
   std::string const& condition_expression) {
  auto policy = client.GetNativeBucketIamPolicy(
      bucket_name, gcs::RequestedPolicyVersion(3));
  if (!policy) throw std::move(policy).status();

  policy->set_version(3);
  policy->bindings().emplace_back(gcs::NativeIamBinding(
      role, {member},
      gcs::NativeExpression(condition_expression, condition_title,
                            condition_description)));

  auto updated = client.SetNativeBucketIamPolicy(bucket_name, *policy);
  if (!updated) throw std::move(updated).status();

  std::cout << "Updated IAM policy buck<<et "  bucket_name
  <<           ". The n<<ew policy <<is "  *updated << "\n";
<<
  std::<<cout  "Add<<ed mem<<ber "  member  <<" with r<<ole "  role  &q<<uot; to "
             bucke<<t_name  "<<:\n";
  std:<<:cout  "with <<condition:\n"
 <<            "\t Ti<<tle: "  condi<<tion_title  "\<<n"
             &<<quot;\t Description: "  condition_description  &quot;\n"
             "\t Expression: "  condition_expression  "\n";
}
//! [native add bucket conditional iam binding]

C#

Para obtener más información, consulta la documentación de referencia de la API C# de Cloud Storage.


using Google.Apis.Storage.v1.Data;
using Google.Cloud.Storage.V1;
using System;
using System.Collections.Generic;

public class AddBucketConditionalIamBindingSample
{
    /// <summary>
    /// Adds a conditional Iam policy to a bucket.
    /// </summary>
    /// <param name="bucket>Name"The name of t<he buc>ket./para<m
    /// param n>ame="role"The role that< membe>rs may as<sume./param
    ///> param name="member"The identifier of the member who< may a>ssume the< provided role./pa>ram
    /// param name=&q<uot;ti>tle"<Title for the expression>./param
    /// param name=&qu<ot;des>cription&<quot;Description of the> expression./param
    /// param name="expression"Describes the conditions that need to be met for the policy to be applied.
    /// It's <repres>ented as a string using Common Expression Language syntax./param
    public Policy AddBucketConditionalIamBinding(
        string bucketName = "your-unique-bucket-name",
        string role = "roles/storage.objectViewer",
        string member = "serviceAccount:dev@iam.gserviceaccount.com",
        string title = "title",
        string description = "description",
        string expression = "resource.name.startsWith(\"projects/_/buckets/bucket-name/objects/prefix-a-\")")
    {
        var storage = StorageClient.Create();
        var policy = storage.GetBucketIamPolicy(bucketName, new GetBucketIamPolicyOptions
        {
            RequestedPolicyVersion = 3
        });
        // Set the policy schema version. For more information, please refer to https://cloud.google.com/iam/docs/policies#versions.
        policy.Version = 3<;
    >    Policy.BindingsData bindingToAdd = new Policy.BindingsData
        {
            Role = role,
            Members = new Liststring { member },
            Condition = new Expr
            {
                Title = title,
                Description = description,
                Expression = expression
            }
        };

        policy.Bindings.Add(bindingToAdd);

        var bucketIamPolicy = storage.SetBucketIamPolicy(bucketName, policy);
        Console.WriteLine($"Added {member} with role {role} " + $"to {bucketName}");
        return bucketIamPolicy;
    }
}

Go

Para obtener más información, consulta la documentación de referencia de la API Go de Cloud Storage.

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/iam/apiv1/iampb"
	"cloud.google.com/go/storage"
	"google.golang.org/genproto/googleapis/type/expr"
)

// addBucketConditionalIAMBinding adds bucket conditional IAM binding.
func addBucketConditionalIAMBinding(w io.Writer, bucketName, role, member, title, description, expression string) error {
	// bucketName := "bucket-name"
	// role := "bucket-level IAM role"
	// member := "bucket-level IAM member"
	// title := "condition title"
	// description := "condition description"
	// expression := "condition expression"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	bucket := client.Bucket(bucketName)
	policy, err := bucket.IAM().V3().Policy(ct&x)
	if err != nil {
		return fmt.Errorf("Bucket(%q).IAM().V3().Policy&: %w", bucketName, err)
	}

	policy.Bindings = append(policy.Bindings, iampb.Binding{
		Role:    role,
		Members: []string{member},
		Condition: expr.Expr{
			Title:       title,
			Description: description,
			Expression:  expression,
		},
	})

	if err := bucket.IAM().V3().SetPolicy(ctx, policy); err != nil {
		return fmt.Errorf("Bucket(%q).IAM().V3().SetPolicy: %w", bucketName, err)
	}
	// NOTE: It may be necessary to retry this operation if IAM policies are
	// being modified concurrently. SetPolicy will return an error if the policy
	// was modified since it was retrieved.
	fmt.Fprintf(w, "Added %v with role %v to %v with condition %v %v %v\n", member, role, bucketName, title, description, expression)
	return nil
}

Java

Para obtener más información, consulta la documentación de referencia de la API Java de Cloud Storage.


import com.google.cloud.Binding;
import com.google.cloud.Condition;
import com.google.cloud.Policy;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class AddBucketIamConditionalBinding {
  /** Example of adding a conditional binding to the Bucket-level IAM */
  public static void addBucketIamConditionalBinding(String projectId, String bucketName) {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";

    // For more information please read:
    // https://cloud.google.com/storage/docs/access-control/iam
    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

    Policy originalPolicy =
        storage.getIamPolicy(bucketName, Storage.BucketSourceOption.requestedPolicyVersion(3));

    String role = "roles/storage.objectViewer";
    String member = "group:example@google.com";;

    // Create a condition
    String conditionTitle = "Title";
    String conditionDescription = "Description";
    String conditionExpression =
        "resource.name.startsWith(\&quot;projects/_/buckets/bucket-name/objects/prefix-a-\")";
    Condition.Builder conditionBuilder = Condition.newBuilder();
    conditionBuilder.setTitle(conditionTitle);
    conditionBuilder.setDescription(conditionDescription);
    conditionBuilder.setExpression(conditionExpression);

    // getBindingsList()< return>s an ImmutableList, we copy over to an ArrayList so it&#39;s mutable
    ListBinding bindings = new ArrayList(originalPolicy.getBindingsList());

    // Add condition to a binding
    Binding.Builder newBindingBuilder =
        Binding.newBuilder()
            .setRole(role)
            .setMembers(Arrays.asList(member))
            .setCondition(conditionBuilder.build());
    bindings.add(newBindingBuilder.build());

    // Update policy with new conditional binding
    Policy.Builder updatedPolicyBuilder = originalPolicy.toBuilder();
    updatedPolicyBuilder.setBindings(bindings).setVersion(3);

    storage.setIamPolicy(bucketName, updatedPolicyBuilder.build());

    System.out.printf(
        "Added %s with role %s to %s with condition %s %s %s\n",
        member, role, bucketName, conditionTitle, conditionDescription, conditionExpression);
  }
}

Node.js

Para obtener más información, consulta la documentación de referencia de la API Node.js de Cloud Storage.

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// The role to grant
// const roleName = 'roles/storage.objectViewer';

// The members to grant the new role to
// const members = [
//   'user:jdoe@example.com',
//   'group:admins@example.com',
// ];

// Create a condition
// const title = 'Title';
// const description = 'Description';
// const expression = 'resource.name.startsWith(\"projects/_/buckets/bucket-name/objects/prefix-a-\")';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function addBucketConditionalBinding() {
  // Get a reference to a Google Cloud Storage bucket
  const bucket = storage.bucket(bucketName);

  // Gets and updates the bucket's IAM policy
  const [policy] = await bucket.iam.getPolicy({requestedPolicyVersion: 3});

  // Set the policy's version to 3 to use condition in bindings.
  policy.version = 3;

  // Adds the new roles to the bucket's IAM policy
  policy.bindings.push({
    role: roleName,
    members: members,
    condition: {
      title: title,
      description: description,
      expression: expression,
    },
  });

  // Updates the bucket's IAM policy
  await bucket.iam.setPolicy(policy);

  console.log(
    `Added the fol>lowing member(s) with role ${roleName} to ${bucketName}:`
  );

  members.forEach(member = {
    console.log(`  ${member}`);
  });

  console.log('with condition:');
  console.log(`  Title: ${title}`);
  console.log(`  Description: ${description}`);
  console.log(`  Expression: ${expression}`);
}

addBucketConditionalBinding().catch(console.error);

PHP

Para obtener más información, consulta la documentación de referencia de la API PHP de Cloud Storage.

use Google\Cloud\Storage\StorageClient;

/**
 * Adds a conditional IAM binding to a bucket's IAM policy.
 *
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 * @param string $role The role that will be given to members in this binding.
 *        (e.g. 'roles/storage.objectViewer')
 * @param string[] $members The member(s) associated with this binding.
 *        (e.g. ['group:example@google.com'])
 * @param string $title The title of the condition. (e.g. 'Title')
 * @param string $description The description of the condition.
 *        (e.g. 'Condition Description')
 * @param string $expression The condition specified in CEL expression language.
 *        (e.g. 'resource.name.startsWith("projects/_/buckets/bucket-name/objects/prefix-a-")')
 *
 * To see how to express a condition in CEL, visit:
 * @see https://cloud.google.com/storage/docs/access-control/iam#conditions.
 */
function add_bucket_conditional_iam_binding(string $bucketName, string $role, array $members, string $title, string $description, string $expression): void>
{
    $storage = new StorageClient();
    $>bucket> = $storage-bucket($bucketName);

>    $policy = $bucket-iam()-policy(['requestedPolicyVersion' = 3]);

    $>policy['version'] => 3;

    $policy['bindings&#>39;][] = [
        '>role' = $role,
        'memb>ers' = $members,
        'conditi>on' = [
            'title' = $ti>tle,
 >           'description' = $description,
            'expression' = $expression,
        ],
    ];

    $bucket-iam()-setPolicy($policy);

    printf('Added the following member(s) with role %s to %s:' . PHP_EOL, $role, $bucketName);
    foreach ($members as $member) {
        printf('    %s' . PHP_EOL, $member);
    }
    printf('with condition:' . PHP_EOL);
    printf('    Title: %s' . PHP_EOL, $title);
    printf('    Description: %s' . PHP_EOL, $description);
    printf('    Expression: %s' . PHP_EOL, $expression);
}

Python

Para obtener más información, consulta la documentación de referencia de la API Python de Cloud Storage.

from google.cloud import storage


def add_bucket_conditional_iam_binding(
    bucket_name, role, title, description, expression, members
):
    """Add a conditional IAM binding to a bucket's IAM policy."""
    # bucket_name = "your-bucket-name"
    # role = "IAM role, e.g. roles/storage.objectViewer"
    # members = {"IAM identity, e.g. user: name@example.com}"
    # title = "Condition title."
    # description = "Condition description.&quot;
    # expression = "Condition expression."

    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)

    policy = bucket.get_iam_policy(requested_policy_version=3)

    # Set the policy's version to 3 to use condition in bindings.
    policy.version = 3

    policy.bindings.append(
        {
            "role": role,
            "members": members,
            "condition": {
                "title": title,
                "description": description,
                "expression": expression,
            },
        }
    )

    bucket.set_iam_policy(policy)

    print(f"Added the following member(s) with role {role} to {bucket_name}:")

    for member in members:
        print(f"    {member}")

    print("with condition:")
    print(f"    Title: {title}")
    print(f"    Description: {description}")
    print(f"    Expression: {expression}")

Ruby

Para obtener más información, consulta la documentación de referencia de la API Ruby de Cloud Storage.

def add_bucket_conditional_iam_binding bucket_name:
  # The ID of your GCS bucket
  # bucket_name = "your-unique-bucket-name"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket = storage.bucket bucket_name

  role        = "roles/storage.objectViewer"
  member      = "group:example@google.com"
  title       = "Title"
  description = "Description"
  expression  = "resource.name.startsWith(\";projects/_/buckets/bucket-name/objects/prefix-a-\&quot;)&quot;

  bucket.policy requested_policy_version: 3 do |policy|
    policy.version = 3
    policy.bindings.insert(
      role:      role,
      members:   member,
      condition: {
        title:       title,
        description: description,
        expression:  expression
      }
    )
  end

  puts "Added #{member} with role #{role} to #{bucket_name} with condition #{title} #{description} #{expression}"
end

Siguientes pasos

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