Fix authentication failures after going halfway through a sign-in attempt (#16607)

* Add tests

* Add security-related tests

My first (unpublished) attempt at fixing the issues introduced (extremely
hard-to-exploit) security vulnerabilities, addressing them in a test.

* Fix authentication failures after going halfway through a sign-in attempt

* Refactor `authenticate_with_sign_in_token` and `authenticate_with_two_factor` to make the two authentication steps more obvious
This commit is contained in:
Claire 2021-08-25 22:52:41 +02:00
parent e10920eb20
commit edc55002cf
4 changed files with 143 additions and 22 deletions

View file

@ -58,16 +58,20 @@ class Auth::SessionsController < Devise::SessionsController
protected
def find_user
if session[:attempt_user_id]
if user_params[:email].present?
find_user_from_params
elsif session[:attempt_user_id]
User.find_by(id: 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
user ||= User.find_for_authentication(email: user_params[:email])
user
end
end
def find_user_from_params
user = User.authenticate_with_ldap(user_params) if Devise.ldap_authentication
user ||= User.authenticate_with_pam(user_params) if Devise.pam_authentication
user ||= User.find_for_authentication(email: user_params[:email])
user
end
def user_params
params.require(:user).permit(:email, :password, :otp_attempt, :sign_in_token_attempt, credential: {})
end

View file

@ -16,14 +16,18 @@ module SignInTokenAuthenticationConcern
end
def authenticate_with_sign_in_token
user = self.resource = find_user
if user_params[:email].present?
user = self.resource = find_user_from_params
prompt_for_sign_in_token(user) if user&.external_or_valid_password?(user_params[:password])
elsif session[:attempt_user_id]
user = self.resource = User.find_by(id: session[:attempt_user_id])
return if user.nil?
if user.present? && session[:attempt_user_id].present? && session[:attempt_user_updated_at] != user.updated_at.to_s
restart_session
elsif user_params.key?(:sign_in_token_attempt) && 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)
if session[:attempt_user_updated_at] != user.updated_at.to_s
restart_session
elsif user_params.key?(:sign_in_token_attempt)
authenticate_with_sign_in_token_attempt(user)
end
end
end

View file

@ -35,16 +35,20 @@ module TwoFactorAuthenticationConcern
end
def authenticate_with_two_factor
user = self.resource = find_user
if user_params[:email].present?
user = self.resource = find_user_from_params
prompt_for_two_factor(user) if user&.external_or_valid_password?(user_params[:password])
elsif session[:attempt_user_id]
user = self.resource = User.find_by(id: session[:attempt_user_id])
return if user.nil?
if user.present? && session[:attempt_user_id].present? && session[:attempt_user_updated_at] != user.updated_at.to_s
restart_session
elsif user.webauthn_enabled? && user_params.key?(:credential) && session[:attempt_user_id]
authenticate_with_two_factor_via_webauthn(user)
elsif user_params.key?(:otp_attempt) && session[:attempt_user_id]
authenticate_with_two_factor_via_otp(user)
elsif user.present? && user.external_or_valid_password?(user_params[:password])
prompt_for_two_factor(user)
if session[:attempt_user_updated_at] != user.updated_at.to_s
restart_session
elsif user.webauthn_enabled? && user_params.key?(:credential)
authenticate_with_two_factor_via_webauthn(user)
elsif user_params.key?(:otp_attempt)
authenticate_with_two_factor_via_otp(user)
end
end
end

View file

@ -206,6 +206,38 @@ RSpec.describe Auth::SessionsController, type: :controller do
end
end
context 'using email and password after an unfinished log-in attempt to a 2FA-protected account' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: true, otp_secret: User.generate_otp_secret(32))
end
before do
post :create, params: { user: { email: other_user.email, password: other_user.password } }
post :create, params: { user: { email: user.email, password: user.password } }
end
it 'renders two factor authentication page' do
expect(controller).to render_template("two_factor")
expect(controller).to render_template(partial: "_otp_authentication_form")
end
end
context 'using email and password after an unfinished log-in attempt with a sign-in token challenge' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: false, current_sign_in_at: 1.month.ago)
end
before do
post :create, params: { user: { email: other_user.email, password: other_user.password } }
post :create, params: { user: { email: user.email, password: user.password } }
end
it 'renders two factor authentication page' do
expect(controller).to render_template("two_factor")
expect(controller).to render_template(partial: "_otp_authentication_form")
end
end
context 'using upcase email and password' do
before do
post :create, params: { user: { email: user.email.upcase, password: user.password } }
@ -231,6 +263,21 @@ RSpec.describe Auth::SessionsController, type: :controller do
end
end
context 'using a valid OTP, attempting to leverage previous half-login to bypass password auth' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: false, current_sign_in_at: 1.month.ago)
end
before do
post :create, params: { user: { email: other_user.email, password: other_user.password } }
post :create, params: { user: { email: user.email, otp_attempt: user.current_otp } }, session: { attempt_user_updated_at: user.updated_at.to_s }
end
it "doesn't log the user in" do
expect(controller.current_user).to be_nil
end
end
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)
@ -380,6 +427,52 @@ RSpec.describe Auth::SessionsController, type: :controller do
end
end
context 'using email and password after an unfinished log-in attempt to a 2FA-protected account' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: true, otp_secret: User.generate_otp_secret(32))
end
before do
post :create, params: { user: { email: other_user.email, password: other_user.password } }
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 email and password after an unfinished log-in attempt with a sign-in token challenge' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: false, current_sign_in_at: 1.month.ago)
end
before do
post :create, params: { user: { email: other_user.email, password: other_user.password } }
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).with(user, any_args)
end
end
context 'using a valid sign in token' do
before do
user.generate_sign_in_token && user.save
@ -395,6 +488,22 @@ RSpec.describe Auth::SessionsController, type: :controller do
end
end
context 'using a valid sign in token, attempting to leverage previous half-login to bypass password auth' do
let!(:other_user) do
Fabricate(:user, email: 'z@y.com', password: 'abcdefgh', otp_required_for_login: false, current_sign_in_at: 1.month.ago)
end
before do
user.generate_sign_in_token && user.save
post :create, params: { user: { email: other_user.email, password: other_user.password } }
post :create, params: { user: { email: user.email, sign_in_token_attempt: user.sign_in_token } }, session: { attempt_user_updated_at: user.updated_at.to_s }
end
it "doesn't log the user in" do
expect(controller.current_user).to be_nil
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, attempt_user_updated_at: user.updated_at.to_s }