332 lines
11 KiB
Ruby
332 lines
11 KiB
Ruby
#
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# Copyright (C) 2011 - 2013 Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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module AuthenticationMethods
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def authorized(*groups)
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authorized_roles = groups
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return true
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end
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def authorized_roles
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@authorized_roles ||= []
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end
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def consume_authorized_roles
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authorized_roles = []
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end
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def load_pseudonym_from_policy
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if (policy_encoded = params['Policy']) &&
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(signature = params['Signature']) &&
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signature == Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), Attachment.shared_secret, policy_encoded)).gsub(/\n/, '') &&
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(policy = JSON.parse(Base64.decode64(policy_encoded)) rescue nil) &&
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policy['conditions'] &&
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(credential = policy['conditions'].detect{ |cond| cond.is_a?(Hash) && cond.has_key?("pseudonym_id") })
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@policy_pseudonym_id = credential['pseudonym_id']
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# so that we don't have to explicitly skip verify_authenticity_token
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params[self.class.request_forgery_protection_token] ||= form_authenticity_token
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end
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yield if block_given?
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end
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class AccessTokenError < Exception
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end
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class LoggedOutError < Exception
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end
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def self.access_token(request, params_method = :params)
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auth_header = request.authorization
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if auth_header.present? && (header_parts = auth_header.split(' ', 2)) && header_parts[0] == 'Bearer'
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header_parts[1]
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else
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request.send(params_method)['access_token'].presence
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end
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end
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def self.user_id(request)
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request.session[:user_id]
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end
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def load_pseudonym_from_jwt
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return unless api_request?
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token_string = AuthenticationMethods.access_token(request)
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return unless token_string.present?
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begin
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services_jwt = Canvas::Security::ServicesJwt.new(token_string)
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@current_user = User.find(services_jwt.user_global_id)
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@current_pseudonym = @current_user.find_pseudonym_for_account(@domain_root_account, true)
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unless @current_user && @current_pseudonym
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raise AccessTokenError
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end
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@authenticated_with_jwt = true
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rescue JSON::JWT::InvalidFormat, Canvas::Security::TokenExpired, Canvas::Security::InvalidToken
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# could still be a regular access token
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return
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end
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end
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def load_pseudonym_from_access_token
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return unless api_request? || (params[:controller] == 'oauth2_provider' && params[:action] == 'destroy')
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token_string = AuthenticationMethods.access_token(request)
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if token_string
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@access_token = AccessToken.authenticate(token_string)
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if !@access_token
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raise AccessTokenError
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end
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if !@access_token.authorized_for_account?(@domain_root_account)
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raise AccessTokenError
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end
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@current_user = @access_token.user
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@current_pseudonym = @current_user.find_pseudonym_for_account(@domain_root_account, true)
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unless @current_user && @current_pseudonym
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raise AccessTokenError
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end
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@access_token.used!
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RequestContextGenerator.add_meta_header('at', @access_token.global_id)
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RequestContextGenerator.add_meta_header('dk', @access_token.global_developer_key_id) if @access_token.developer_key_id
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end
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end
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def load_user
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@current_user = @current_pseudonym = nil
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masked_authenticity_token # ensure that the cookie is set
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load_pseudonym_from_jwt
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unless @current_pseudonym.present?
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load_pseudonym_from_access_token
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end
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if !@current_pseudonym
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if @policy_pseudonym_id
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@current_pseudonym = Pseudonym.where(id: @policy_pseudonym_id).first
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elsif @pseudonym_session = PseudonymSession.find
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@current_pseudonym = @pseudonym_session.record
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# if the session was created before the last time the user explicitly
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# logged out (of any session for any of their pseudonyms), invalidate
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# this session
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invalid_before = @current_pseudonym.user.last_logged_out
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# they logged out in the future?!? something's busted; just ignore it -
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# either my clock is off or whoever set this value's clock is off
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invalid_before = nil if invalid_before && invalid_before > Time.now.utc
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if invalid_before &&
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(session_refreshed_at = request.env['encrypted_cookie_store.session_refreshed_at']) &&
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session_refreshed_at < invalid_before
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logger.info "Invalidating session: Session created before user logged out."
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destroy_session
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@current_pseudonym = nil
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if api_request? || request.format.json?
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raise LoggedOutError
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end
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end
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if @current_pseudonym &&
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session[:cas_session] &&
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@current_pseudonym.cas_ticket_expired?(session[:cas_session])
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logger.info "Invalidating session: CAS ticket expired - #{session[:cas_session]}."
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destroy_session
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@current_pseudonym = nil
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raise LoggedOutError if api_request? || request.format.json?
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redirect_to_login
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end
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end
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if params[:login_success] == '1' && !@current_pseudonym
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# they just logged in successfully, but we can't find the pseudonym now?
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# sounds like somebody hates cookies.
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return redirect_to(login_url(:needs_cookies => '1'))
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end
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@current_user = @current_pseudonym && @current_pseudonym.user
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end
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if @current_user && @current_user.unavailable?
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@current_pseudonym = nil
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@current_user = nil
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end
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# required by the user throttling middleware
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session[:user_id] = @current_user.global_id if @current_user
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if @current_user && %w(become_user_id me become_teacher become_student).any? { |k| params.key?(k) }
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request_become_user = nil
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if params[:become_user_id]
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request_become_user = User.where(id: params[:become_user_id]).first
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elsif params.keys.include?('me')
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request_become_user = @current_user
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elsif params.keys.include?('become_teacher')
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course = Course.find(params[:course_id] || params[:id]) rescue nil
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teacher = course.teachers.first if course
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if teacher
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request_become_user = teacher
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else
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flash[:error] = I18n.t('lib.auth.errors.teacher_not_found', "No teacher found")
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end
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elsif params.keys.include?('become_student')
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course = Course.find(params[:course_id] || params[:id]) rescue nil
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student = course.students.first if course
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if student
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request_become_user = student
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else
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flash[:error] = I18n.t('lib.auth.errors.student_not_found', "No student found")
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end
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end
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if request_become_user && request_become_user.id != session[:become_user_id].to_i && request_become_user.can_masquerade?(@current_user, @domain_root_account)
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params_without_become = params.dup
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params_without_become.delete_if {|k,v| [ 'become_user_id', 'become_teacher', 'become_student', 'me' ].include? k }
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params_without_become[:only_path] = true
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session[:masquerade_return_to] = url_for(params_without_become)
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return redirect_to user_masquerade_url(request_become_user.id)
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end
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end
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as_user_id = api_request? && params[:as_user_id].presence
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as_user_id ||= session[:become_user_id]
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if as_user_id
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begin
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user = api_find(User, as_user_id)
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rescue ActiveRecord::RecordNotFound
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end
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if user && user.can_masquerade?(@current_user, @domain_root_account)
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@real_current_user = @current_user
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@current_user = user
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@real_current_pseudonym = @current_pseudonym
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@current_pseudonym = @current_user.find_pseudonym_for_account(@domain_root_account, true)
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logger.warn "#{@real_current_user.name}(#{@real_current_user.id}) impersonating #{@current_user.name} on page #{request.url}"
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elsif api_request?
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# fail silently for UI, but not for API
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render :json => {:errors => "Invalid as_user_id"}, :status => :unauthorized
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return false
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end
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end
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@current_user
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end
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private :load_user
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def require_user
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if @current_user && @current_pseudonym
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true
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else
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redirect_to_login
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false
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end
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end
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protected :require_user
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def clean_return_to(url)
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return nil if url.blank?
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begin
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uri = URI.parse(url)
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rescue URI::Error
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return nil
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end
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return nil unless uri.path[0] == '/'
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return "#{request.protocol}#{request.host_with_port}#{uri.path}#{uri.query && "?#{uri.query}"}#{uri.fragment && "##{uri.fragment}"}"
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end
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def return_to(url, fallback)
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url = clean_return_to(url) || clean_return_to(fallback)
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redirect_to url
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end
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def store_location(uri=nil, overwrite=true)
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if overwrite || !session[:return_to]
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uri ||= request.get? ? request.fullpath : request.referrer
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session[:return_to] = clean_return_to(uri)
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end
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end
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protected :store_location
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def redirect_back_or_default(default)
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redirect_to(session[:return_to] || default)
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session.delete(:return_to)
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end
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protected :redirect_back_or_default
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def redirect_to_referrer_or_default(default)
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redirect_to(:back)
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rescue ActionController::RedirectBackError
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redirect_to(default)
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end
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def redirect_to_login
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return unless fix_ms_office_redirects
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respond_to do |format|
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format.html {
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store_location
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flash[:warning] = I18n.t('lib.auth.errors.not_authenticated', "You must be logged in to access this page") unless request.path == '/'
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redirect_to login_url(params.slice(:canvas_login, :authentication_provider))
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}
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format.json { render_json_unauthorized }
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end
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end
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def render_json_unauthorized
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add_www_authenticate_header if api_request? && !@current_user
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if @current_user
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render :json => {
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:status => I18n.t('lib.auth.status_unauthorized', 'unauthorized'),
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:errors => [{ :message => I18n.t('lib.auth.not_authorized', "user not authorized to perform that action") }]
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},
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:status => :unauthorized
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else
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render :json => {
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:status => I18n.t('lib.auth.status_unauthenticated', 'unauthenticated'),
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:errors => [{ :message => I18n.t('lib.auth.authentication_required', "user authorization required") }]
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},
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:status => :unauthorized
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end
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end
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def add_www_authenticate_header
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response['WWW-Authenticate'] = %{Bearer realm="canvas-lms"}
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end
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# Reset the session, and copy the specified keys over to the new session.
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# Please consider the security implications of any keys you copy over.
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def reset_session_saving_keys(*keys)
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# can't use slice, because session has a different ctor than a normal hash
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saved = {}
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keys.each { |k| saved[k] = session[k] if session[k] }
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reset_session
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saved.each_pair { |k, v| session[k] = v }
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end
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# this really belongs on Login::Shared, but is left here for plugins that
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# have always overridden it here
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def delegated_auth_redirect_uri(uri)
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uri
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end
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end
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