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EnableAuthenticator.cshtml.cs
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EnableAuthenticator.cshtml.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
namespace Microsoft.AspNetCore.Identity.UI.V5.Pages.Account.Manage.Internal
{
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
[IdentityDefaultUI(typeof(EnableAuthenticatorModel<>))]
public class EnableAuthenticatorModel : PageModel
{
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public string SharedKey { get; set; }
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public string AuthenticatorUri { get; set; }
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
[TempData]
public string[] RecoveryCodes { get; set; }
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
[TempData]
public string StatusMessage { get; set; }
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
[BindProperty]
public InputModel Input { get; set; }
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public class InputModel
{
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
[Required]
[StringLength(7, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 6)]
[DataType(DataType.Text)]
[Display(Name = "Verification Code")]
public string Code { get; set; }
}
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual Task<IActionResult> OnGetAsync() => throw new NotImplementedException();
/// <summary>
/// This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual Task<IActionResult> OnPostAsync() => throw new NotImplementedException();
}
internal class EnableAuthenticatorModel<TUser> : EnableAuthenticatorModel where TUser : class
{
private readonly UserManager<TUser> _userManager;
private readonly ILogger<EnableAuthenticatorModel> _logger;
private readonly UrlEncoder _urlEncoder;
private const string AuthenticatorUriFormat = "otpauth://totp/{0}:{1}?secret={2}&issuer={0}&digits=6";
public EnableAuthenticatorModel(
UserManager<TUser> userManager,
ILogger<EnableAuthenticatorModel> logger,
UrlEncoder urlEncoder)
{
_userManager = userManager;
_logger = logger;
_urlEncoder = urlEncoder;
}
public override async Task<IActionResult> OnGetAsync()
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
}
await LoadSharedKeyAndQrCodeUriAsync(user);
return Page();
}
public override async Task<IActionResult> OnPostAsync()
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
}
if (!ModelState.IsValid)
{
await LoadSharedKeyAndQrCodeUriAsync(user);
return Page();
}
// Strip spaces and hyphens
var verificationCode = Input.Code.Replace(" ", string.Empty).Replace("-", string.Empty);
var is2faTokenValid = await _userManager.VerifyTwoFactorTokenAsync(
user, _userManager.Options.Tokens.AuthenticatorTokenProvider, verificationCode);
if (!is2faTokenValid)
{
ModelState.AddModelError("Input.Code", "Verification code is invalid.");
await LoadSharedKeyAndQrCodeUriAsync(user);
return Page();
}
await _userManager.SetTwoFactorEnabledAsync(user, true);
var userId = await _userManager.GetUserIdAsync(user);
_logger.LogInformation(LoggerEventIds.TwoFAEnabled, "User has enabled 2FA with an authenticator app.");
StatusMessage = "Your authenticator app has been verified.";
if (await _userManager.CountRecoveryCodesAsync(user) == 0)
{
var recoveryCodes = await _userManager.GenerateNewTwoFactorRecoveryCodesAsync(user, 10);
RecoveryCodes = recoveryCodes.ToArray();
return RedirectToPage("./ShowRecoveryCodes");
}
else
{
return RedirectToPage("./TwoFactorAuthentication");
}
}
private async Task LoadSharedKeyAndQrCodeUriAsync(TUser user)
{
// Load the authenticator key & QR code URI to display on the form
var unformattedKey = await _userManager.GetAuthenticatorKeyAsync(user);
if (string.IsNullOrEmpty(unformattedKey))
{
await _userManager.ResetAuthenticatorKeyAsync(user);
unformattedKey = await _userManager.GetAuthenticatorKeyAsync(user);
}
SharedKey = FormatKey(unformattedKey);
var email = await _userManager.GetEmailAsync(user);
AuthenticatorUri = GenerateQrCodeUri(email, unformattedKey);
}
private string FormatKey(string unformattedKey)
{
var result = new StringBuilder();
int currentPosition = 0;
while (currentPosition + 4 < unformattedKey.Length)
{
result.Append(unformattedKey.AsSpan(currentPosition, 4)).Append(' ');
currentPosition += 4;
}
if (currentPosition < unformattedKey.Length)
{
result.Append(unformattedKey.AsSpan(currentPosition));
}
return result.ToString().ToLowerInvariant();
}
private string GenerateQrCodeUri(string email, string unformattedKey)
{
return string.Format(
CultureInfo.InvariantCulture,
AuthenticatorUriFormat,
_urlEncoder.Encode("Microsoft.AspNetCore.Identity.UI"),
_urlEncoder.Encode(email),
unformattedKey);
}
}
}