abp-authorization

Development

ABP permission system - PermissionDefinitionProvider, [Authorize] attribute, CheckPolicyAsync, IsGrantedAsync, ICurrentUser, IPermissionManager, multi-tenancy side. Use when working with permissions, authorization, role-based access, or security in ABP projects.

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ABP Authorization

Docs: https://abp.io/docs/latest/framework/fundamentals/authorization

Permission Definition

Define permissions in *.Application.Contracts project:

public static class BookStorePermissions
{
    public const string GroupName = "BookStore";

    public static class Books
    {
        public const string Default = GroupName + ".Books";
        public const string Create = Default + ".Create";
        public const string Edit = Default + ".Edit";
        public const string Delete = Default + ".Delete";
    }
}

public class BookStorePermissionDefinitionProvider : PermissionDefinitionProvider
{
    public override void Define(IPermissionDefinitionContext context)
    {
        var bookStoreGroup = context.AddGroup(BookStorePermissions.GroupName, L("Permission:BookStore"));

        var booksPermission = bookStoreGroup.AddPermission(
            BookStorePermissions.Books.Default,
            L("Permission:Books"));

        booksPermission.AddChild(
            BookStorePermissions.Books.Create,
            L("Permission:Books.Create"));

        booksPermission.AddChild(
            BookStorePermissions.Books.Edit,
            L("Permission:Books.Edit"));

        booksPermission.AddChild(
            BookStorePermissions.Books.Delete,
            L("Permission:Books.Delete"));
    }

    private static LocalizableString L(string name)
    {
        return LocalizableString.Create<BookStoreResource>(name);
    }
}

Using Permissions

Declarative (Attribute)

[Authorize(BookStorePermissions.Books.Create)]
public virtual async Task<BookDto> CreateAsync(CreateBookDto input)
{
    // Only users with Books.Create permission can execute
}

Programmatic Check

public class BookAppService : ApplicationService
{
    public async Task DoSomethingAsync()
    {
        // Check and throw if not granted
        await CheckPolicyAsync(BookStorePermissions.Books.Edit);

        // Or check without throwing
        if (await IsGrantedAsync(BookStorePermissions.Books.Delete))
        {
            // Has permission
        }
    }
}

Allow Anonymous Access

[AllowAnonymous]
public virtual async Task<BookDto> GetPublicBookAsync(Guid id)
{
    // No authentication required
}

Current User

Access authenticated user info via CurrentUser property (available in base classes like ApplicationService, DomainService, AbpController):

public class BookAppService : ApplicationService
{
    public async Task DoSomethingAsync()
    {
        // CurrentUser is available from base class - no injection needed
        var userId = CurrentUser.Id;
        var userName = CurrentUser.UserName;
        var email = CurrentUser.Email;
        var isAuthenticated = CurrentUser.IsAuthenticated;
        var roles = CurrentUser.Roles;
        var tenantId = CurrentUser.TenantId;
    }
}

// In other services, inject ICurrentUser
public class MyService : ITransientDependency
{
    private readonly ICurrentUser _currentUser;
    public MyService(ICurrentUser currentUser) => _currentUser = currentUser;
}

Ownership Validation

public async Task UpdateMyBookAsync(Guid bookId, UpdateBookDto input)
{
    var book = await _bookRepository.GetAsync(bookId);

    if (book.CreatorId != CurrentUser.Id)
    {
        throw new AbpAuthorizationException();
    }

    // Update book...
}

Multi-Tenancy Permissions

Control permission availability per tenant side:

bookStoreGroup.AddPermission(
    BookStorePermissions.Books.Default,
    L("Permission:Books"),
    multiTenancySide: MultiTenancySides.Tenant // Only for tenants
);

Options: MultiTenancySides.Host, Tenant, or Both

Feature-Dependent Permissions

booksPermission.RequireFeatures("BookStore.PremiumFeature");

Permission Management

Grant/revoke permissions programmatically:

public class MyService : ITransientDependency
{
    private readonly IPermissionManager _permissionManager;

    public async Task GrantPermissionToUserAsync(Guid userId, string permissionName)
    {
        await _permissionManager.SetForUserAsync(userId, permissionName, true);
    }

    public async Task GrantPermissionToRoleAsync(string roleName, string permissionName)
    {
        await _permissionManager.SetForRoleAsync(roleName, permissionName, true);
    }
}

Security Best Practices

Never trust client input for user identity
Use CurrentUser property (from base class) or inject ICurrentUser
Validate ownership in application service methods
Filter queries by current user when appropriate
Don't expose sensitive fields in DTOs