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Add e-mail-based sign in challenge for users with disabled 2FA (#14013)

This commit is contained in:
Eugen Rochko 2020-06-09 10:23:06 +02:00 committed by GitHub
parent 8b6d97fb7c
commit 72a7cfaa39
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GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 368 additions and 51 deletions
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50
app/controllers/auth/sessions_controller.rb
View File

@ -8,7 +8,8 @@ class Auth::SessionsController < Devise::SessionsController
skip_before_action :require_no_authentication, only: [:create]
skip_before_action :require_functional!
prepend_before_action :authenticate_with_two_factor, if: :two_factor_enabled?, only: [:create]
include TwoFactorAuthenticationConcern
include SignInTokenAuthenticationConcern
before_action :set_instance_presenter, only: [:new]
before_action :set_body_classes
@ -39,8 +40,8 @@ class Auth::SessionsController < Devise::SessionsController
protected
def find_user
if session[:otp_user_id]
User.find(session[:otp_user_id])
if session[:attempt_user_id]
User.find(session[:attempt_user_id])
else
user = User.authenticate_with_ldap(user_params) if Devise.ldap_authentication
user ||= User.authenticate_with_pam(user_params) if Devise.pam_authentication
@ -49,7 +50,7 @@ class Auth::SessionsController < Devise::SessionsController
end
def user_params
params.require(:user).permit(:email, :password, :otp_attempt)
params.require(:user).permit(:email, :password, :otp_attempt, :sign_in_token_attempt)
end
def after_sign_in_path_for(resource)
@ -70,47 +71,6 @@ class Auth::SessionsController < Devise::SessionsController
super
end
def two_factor_enabled?
find_user&.otp_required_for_login?
end
def valid_otp_attempt?(user)
user.validate_and_consume_otp!(user_params[:otp_attempt]) ||
user.invalidate_otp_backup_code!(user_params[:otp_attempt])
rescue OpenSSL::Cipher::CipherError
false
end
def authenticate_with_two_factor
user = self.resource = find_user
if user_params[:otp_attempt].present? && session[:otp_user_id]
authenticate_with_two_factor_via_otp(user)
elsif user.present? && (user.encrypted_password.blank? || user.valid_password?(user_params[:password]))
# If encrypted_password is blank, we got the user from LDAP or PAM,
# so credentials are already valid
prompt_for_two_factor(user)
end
end
def authenticate_with_two_factor_via_otp(user)
if valid_otp_attempt?(user)
session.delete(:otp_user_id)
remember_me(user)
sign_in(user)
else
flash.now[:alert] = I18n.t('users.invalid_otp_token')
prompt_for_two_factor(user)
end
end
def prompt_for_two_factor(user)
session[:otp_user_id] = user.id
@body_classes = 'lighter'
render :two_factor
end
def require_no_authentication
super
# Delete flash message that isn't entirely useful and may be confusing in

49
app/controllers/concerns/sign_in_token_authentication_concern.rb Normal file
View File

@ -0,0 +1,49 @@
# frozen_string_literal: true
module SignInTokenAuthenticationConcern
extend ActiveSupport::Concern
included do
prepend_before_action :authenticate_with_sign_in_token, if: :sign_in_token_required?, only: [:create]
end
def sign_in_token_required?
find_user&.suspicious_sign_in?(request.remote_ip)
end
def valid_sign_in_token_attempt?(user)
Devise.secure_compare(user.sign_in_token, user_params[:sign_in_token_attempt])
end
def authenticate_with_sign_in_token
user = self.resource = find_user
if user_params[:sign_in_token_attempt].present? && session[:attempt_user_id]
authenticate_with_sign_in_token_attempt(user)
elsif user.present? && user.external_or_valid_password?(user_params[:password])
prompt_for_sign_in_token(user)
end
end
def authenticate_with_sign_in_token_attempt(user)
if valid_sign_in_token_attempt?(user)
session.delete(:attempt_user_id)
remember_me(user)
sign_in(user)
else
flash.now[:alert] = I18n.t('users.invalid_sign_in_token')
prompt_for_sign_in_token(user)
end
end
def prompt_for_sign_in_token(user)
if user.sign_in_token_expired?
user.generate_sign_in_token && user.save
UserMailer.sign_in_token(user, request.remote_ip, request.user_agent, Time.now.utc.to_s).deliver_later!
end
session[:attempt_user_id] = user.id
@body_classes = 'lighter'
render :sign_in_token
end
end

47
app/controllers/concerns/two_factor_authentication_concern.rb Normal file
View File

@ -0,0 +1,47 @@
# frozen_string_literal: true
module TwoFactorAuthenticationConcern
extend ActiveSupport::Concern
included do
prepend_before_action :authenticate_with_two_factor, if: :two_factor_enabled?, only: [:create]
end
def two_factor_enabled?
find_user&.otp_required_for_login?
end
def valid_otp_attempt?(user)
user.validate_and_consume_otp!(user_params[:otp_attempt]) ||
user.invalidate_otp_backup_code!(user_params[:otp_attempt])
rescue OpenSSL::Cipher::CipherError
false
end
def authenticate_with_two_factor
user = self.resource = find_user
if user_params[:otp_attempt].present? && session[:attempt_user_id]
authenticate_with_two_factor_attempt(user)
elsif user.present? && user.external_or_valid_password?(user_params[:password])
prompt_for_two_factor(user)
end
end
def authenticate_with_two_factor_attempt(user)
if valid_otp_attempt?(user)
session.delete(:attempt_user_id)
remember_me(user)
sign_in(user)
else
flash.now[:alert] = I18n.t('users.invalid_otp_token')
prompt_for_two_factor(user)
end
end
def prompt_for_two_factor(user)
session[:attempt_user_id] = user.id
@body_classes = 'lighter'
render :two_factor
end
end

17
app/mailers/user_mailer.rb
View File

@ -126,4 +126,21 @@ class UserMailer < Devise::Mailer
reply_to: Setting.site_contact_email
end
end
def sign_in_token(user, remote_ip, user_agent, timestamp)
@resource = user
@instance = Rails.configuration.x.local_domain
@remote_ip = remote_ip
@user_agent = user_agent
@detection = Browser.new(user_agent)
@timestamp = timestamp.to_time.utc
return if @resource.disabled?
I18n.with_locale(@resource.locale || I18n.default_locale) do
mail to: @resource.email,
subject: I18n.t('user_mailer.sign_in_token.subject'),
reply_to: Setting.site_contact_email
end
end
end

28
app/models/user.rb
View File

@ -38,6 +38,8 @@
# chosen_languages :string is an Array
# created_by_application_id :bigint(8)
# approved :boolean default(TRUE), not null
# sign_in_token :string
# sign_in_token_sent_at :datetime
#
class User < ApplicationRecord
@ -113,7 +115,7 @@ class User < ApplicationRecord
:advanced_layout, :use_blurhash, :use_pending_items, :trends, :crop_images,
to: :settings, prefix: :setting, allow_nil: false
attr_reader :invite_code
attr_reader :invite_code, :sign_in_token_attempt
attr_writer :external
def confirmed?
@ -167,6 +169,10 @@ class User < ApplicationRecord
true
end
def suspicious_sign_in?(ip)
!otp_required_for_login? && current_sign_in_at.present? && current_sign_in_at < 2.weeks.ago && !recent_ip?(ip)
end
def functional?
confirmed? && approved? && !disabled? && !account.suspended? && account.moved_to_account_id.nil?
end
@ -269,6 +275,13 @@ class User < ApplicationRecord
super
end
def external_or_valid_password?(compare_password)
# If encrypted_password is blank, we got the user from LDAP or PAM,
# so credentials are already valid
encrypted_password.blank? || valid_password?(compare_password)
end
def send_reset_password_instructions
return false if encrypted_password.blank?
@ -304,6 +317,15 @@ class User < ApplicationRecord
end
end
def sign_in_token_expired?
sign_in_token_sent_at.nil? || sign_in_token_sent_at < 5.minutes.ago
end
def generate_sign_in_token
self.sign_in_token = Devise.friendly_token(6)
self.sign_in_token_sent_at = Time.now.utc
end
protected
def send_devise_notification(notification, *args)
@ -320,6 +342,10 @@ class User < ApplicationRecord
private
def recent_ip?(ip)
recent_ips.any? { |(_, recent_ip)| recent_ip == ip }
end
def send_pending_devise_notifications
pending_devise_notifications.each do |notification, args|
render_and_send_devise_message(notification, *args)

14
app/views/auth/sessions/sign_in_token.html.haml Normal file
View File

@ -0,0 +1,14 @@
- content_for :page_title do
= t('auth.login')
= simple_form_for(resource, as: resource_name, url: session_path(resource_name), method: :post) do |f|
%p.hint.otp-hint= t('users.suspicious_sign_in_confirmation')
.fields-group
= f.input :sign_in_token_attempt, type: :number, wrapper: :with_label, label: t('simple_form.labels.defaults.sign_in_token_attempt'), input_html: { 'aria-label' => t('simple_form.labels.defaults.sign_in_token_attempt'), :autocomplete => 'off' }, autofocus: true
.actions
= f.button :button, t('auth.login'), type: :submit
- if Setting.site_contact_email.present?
%p.hint.subtle-hint= t('users.generic_access_help_html', email: mail_to(Setting.site_contact_email, nil))

105
app/views/user_mailer/sign_in_token.html.haml Normal file
View File

@ -0,0 +1,105 @@
%table.email-table{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.email-body
.email-container
%table.content-section{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.content-cell.hero
.email-row
.col-6
%table.column{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.column-cell.text-center.padded
%table.hero-icon.alert-icon{ align: 'center', cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td
= image_tag full_pack_url('media/images/mailer/icon_email.png'), alt: ''
%h1= t 'user_mailer.sign_in_token.title'
%p.lead= t 'user_mailer.sign_in_token.explanation'
%table.email-table{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.email-body
.email-container
%table.content-section{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.content-cell.content-start
%table.column{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.column-cell.input-cell
%table.input{ align: 'center', cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td= @resource.sign_in_token
%table.email-table{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.email-body
.email-container
%table.content-section{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.content-cell
.email-row
.col-6
%table.column{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.column-cell.text-center
%p= t 'user_mailer.sign_in_token.details'
%tr
%td.column-cell.text-center
%p
%strong= "#{t('sessions.ip')}:"
= @remote_ip
%br/
%strong= "#{t('sessions.browser')}:"
%span{ title: @user_agent }= t 'sessions.description', browser: t("sessions.browsers.#{@detection.id}", default: "#{@detection.id}"), platform: t("sessions.platforms.#{@detection.platform.id}", default: "#{@detection.platform.id}")
%br/
= l(@timestamp)
%table.email-table{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.email-body
.email-container
%table.content-section{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.content-cell
.email-row
.col-6
%table.column{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.column-cell.text-center
%p= t 'user_mailer.sign_in_token.further_actions'
%table.email-table{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.email-body
.email-container
%table.content-section{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.content-cell
%table.column{ cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.column-cell.button-cell
%table.button{ align: 'center', cellspacing: 0, cellpadding: 0 }
%tbody
%tr
%td.button-primary
= link_to edit_user_registration_url do
%span= t 'settings.account_settings'

17
app/views/user_mailer/sign_in_token.text.erb Normal file
View File

@ -0,0 +1,17 @@
<%= t 'user_mailer.sign_in_token.title' %>
===
<%= t 'user_mailer.sign_in_token.explanation' %>
=> <%= @resource.sign_in_token %>
<%= t 'user_mailer.sign_in_token.details' %>
<%= t('sessions.ip') %>: <%= @remote_ip %>
<%= t('sessions.browser') %>: <%= t('sessions.description', browser: t("sessions.browsers.#{@detection.id}", default: "#{@detection.id}"), platform: t("sessions.platforms.#{@detection.platform.id}", default: "#{@detection.platform.id}")) %>
<%= l(@timestamp) %>
<%= t 'user_mailer.sign_in_token.further_actions' %>
=> <%= edit_user_registration_url %>

9
config/locales/en.yml
View File

@ -1273,6 +1273,12 @@ en:
explanation: You requested a full backup of your Mastodon account. It's now ready for download!
subject: Your archive is ready for download
title: Archive takeout
sign_in_token:
details: 'Here are details of the attempt:'
explanation: 'We detected an attempt to sign in to your account from an unrecognized IP address. If this is you, please enter the security code below on the sign in challenge page:'
further_actions: 'If this wasn''t you, please change your password and enable two-factor authentication on your account. You can do so here:'
subject: Please confirm attempted sign in
title: Sign in attempt
warning:
explanation:
disable: While your account is frozen, your account data remains intact, but you cannot perform any actions until it is unlocked.
@ -1310,11 +1316,14 @@ en:
title: Welcome aboard, %{name}!
users:
follow_limit_reached: You cannot follow more than %{limit} people
generic_access_help_html: Trouble accessing your account? You may get in touch with %{email} for assistance
invalid_email: The e-mail address is invalid
invalid_otp_token: Invalid two-factor code
invalid_sign_in_token: Invalid security code
otp_lost_help_html: If you lost access to both, you may get in touch with %{email}
seamless_external_login: You are logged in via an external service, so password and e-mail settings are not available.
signed_in_as: 'Signed in as:'
suspicious_sign_in_confirmation: You appear to not have logged in from this device before, and you haven't logged in for a while, so we're sending a security code to your e-mail address to confirm that it's you.
verification:
explanation_html: 'You can <strong>verify yourself as the owner of the links in your profile metadata</strong>. For that, the linked website must contain a link back to your Mastodon profile. The link back <strong>must</strong> have a <code>rel="me"</code> attribute. The text content of the link does not matter. Here is an example:'
verification: Verification

1
config/locales/simple_form.en.yml
View File

@ -151,6 +151,7 @@ en:
setting_use_blurhash: Show colorful gradients for hidden media
setting_use_pending_items: Slow mode
severity: Severity
sign_in_token_attempt: Security code
type: Import type
username: Username
username_or_email: Username or Email

6
db/migrate/20200608113046_add_sign_in_token_to_users.rb Normal file
View File

@ -0,0 +1,6 @@
class AddSignInTokenToUsers < ActiveRecord::Migration[5.2]
def change
add_column :users, :sign_in_token, :string
add_column :users, :sign_in_token_sent_at, :datetime
end
end

5
db/schema.rb
View File

@ -10,7 +10,8 @@
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 2020_06_05_155027) do
ActiveRecord::Schema.define(version: 2020_06_08_113046) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
@ -869,6 +870,8 @@ ActiveRecord::Schema.define(version: 2020_06_05_155027) do
t.string "chosen_languages", array: true
t.bigint "created_by_application_id"
t.boolean "approved", default: true, null: false
t.string "sign_in_token"
t.datetime "sign_in_token_sent_at"
t.index ["account_id"], name: "index_users_on_account_id"
t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
t.index ["created_by_application_id"], name: "index_users_on_created_by_application_id"

66
spec/controllers/auth/sessions_controller_spec.rb
View File

@ -215,7 +215,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
context 'using a valid OTP' do
before do
post :create, params: { user: { otp_attempt: user.current_otp } }, session: { otp_user_id: user.id }
post :create, params: { user: { otp_attempt: user.current_otp } }, session: { attempt_user_id: user.id }
end
it 'redirects to home' do
@ -230,7 +230,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
context 'when the server has an decryption error' do
before do
allow_any_instance_of(User).to receive(:validate_and_consume_otp!).and_raise(OpenSSL::Cipher::CipherError)
post :create, params: { user: { otp_attempt: user.current_otp } }, session: { otp_user_id: user.id }
post :create, params: { user: { otp_attempt: user.current_otp } }, session: { attempt_user_id: user.id }
end
it 'shows a login error' do
@ -244,7 +244,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
context 'using a valid recovery code' do
before do
post :create, params: { user: { otp_attempt: recovery_codes.first } }, session: { otp_user_id: user.id }
post :create, params: { user: { otp_attempt: recovery_codes.first } }, session: { attempt_user_id: user.id }
end
it 'redirects to home' do
@ -258,7 +258,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
context 'using an invalid OTP' do
before do
post :create, params: { user: { otp_attempt: 'wrongotp' } }, session: { otp_user_id: user.id }
post :create, params: { user: { otp_attempt: 'wrongotp' } }, session: { attempt_user_id: user.id }
end
it 'shows a login error' do
@ -270,5 +270,63 @@ RSpec.describe Auth::SessionsController, type: :controller do
end
end
end
context 'when 2FA is disabled and IP is unfamiliar' do
let!(:user) { Fabricate(:user, email: 'x@y.com', password: 'abcdefgh', current_sign_in_at: 3.weeks.ago, current_sign_in_ip: '0.0.0.0') }
before do
request.remote_ip = '10.10.10.10'
request.user_agent = 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0'
allow(UserMailer).to receive(:sign_in_token).and_return(double('email', deliver_later!: nil))
end
context 'using email and password' do
before do
post :create, params: { user: { email: user.email, password: user.password } }
end
it 'renders sign in token authentication page' do
expect(controller).to render_template("sign_in_token")
end
it 'generates sign in token' do
expect(user.reload.sign_in_token).to_not be_nil
end
it 'sends sign in token e-mail' do
expect(UserMailer).to have_received(:sign_in_token)
end
end
context 'using a valid sign in token' do
before do
user.generate_sign_in_token && user.save
post :create, params: { user: { sign_in_token_attempt: user.sign_in_token } }, session: { attempt_user_id: user.id }
end
it 'redirects to home' do
expect(response).to redirect_to(root_path)
end
it 'logs the user in' do
expect(controller.current_user).to eq user
end
end
context 'using an invalid sign in token' do
before do
post :create, params: { user: { sign_in_token_attempt: 'wrongotp' } }, session: { attempt_user_id: user.id }
end
it 'shows a login error' do
expect(flash[:alert]).to match I18n.t('users.invalid_sign_in_token')
end
it "doesn't log the user in" do
expect(controller.current_user).to be_nil
end
end
end
end
end

5
spec/mailers/previews/user_mailer_preview.rb
View File

@ -59,4 +59,9 @@ class UserMailerPreview < ActionMailer::Preview
def warning
UserMailer.warning(User.first, AccountWarning.new(text: '', action: :silence), [Status.first.id])
end
# Preview this email at http://localhost:3000/rails/mailers/user_mailer/sign_in_token
def sign_in_token
UserMailer.sign_in_token(User.first.tap { |user| user.generate_sign_in_token }, '127.0.0.1', 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0', Time.now.utc)
end
end