discourse/app/controllers/session_controller.rb

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require_dependency 'rate_limiter'
require_dependency 'single_sign_on'
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class SessionController < ApplicationController
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class LocalLoginNotAllowed < StandardError; end
rescue_from LocalLoginNotAllowed do
render body: nil, status: 500
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end
before_action :check_local_login_allowed, only: %i(create forgot_password)
skip_before_action :redirect_to_login_if_required
skip_before_action :preload_json, :check_xhr, only: ['sso', 'sso_login', 'become', 'sso_provider', 'destroy']
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ACTIVATE_USER_KEY = "activate_user"
def csrf
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render json: { csrf: form_authenticity_token }
end
def sso
destination_url = cookies[:destination_url] || session[:destination_url]
return_path = params[:return_path] || path('/')
if destination_url && return_path == path('/')
uri = URI::parse(destination_url)
return_path = "#{uri.path}#{uri.query ? "?" << uri.query : ""}"
end
session.delete(:destination_url)
cookies.delete(:destination_url)
if SiteSetting.enable_sso?
sso = DiscourseSingleSignOn.generate_sso(return_path)
if SiteSetting.verbose_sso_logging
Rails.logger.warn("Verbose SSO log: Started SSO process\n\n#{sso.diagnostics}")
end
redirect_to sso.to_url
else
render body: nil, status: 404
end
end
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def sso_provider(payload = nil)
payload ||= request.query_string
if SiteSetting.enable_sso_provider
sso = SingleSignOn.parse(payload, SiteSetting.sso_secret)
if current_user
sso.name = current_user.name
sso.username = current_user.username
sso.email = current_user.email
sso.external_id = current_user.id.to_s
sso.admin = current_user.admin?
sso.moderator = current_user.moderator?
if sso.return_sso_url.blank?
render plain: "return_sso_url is blank, it must be provided", status: 400
return
end
if request.xhr?
cookies[:sso_destination_url] = sso.to_url(sso.return_sso_url)
else
redirect_to sso.to_url(sso.return_sso_url)
end
else
session[:sso_payload] = request.query_string
redirect_to path('/login')
end
else
render body: nil, status: 404
end
end
# For use in development mode only when login options could be limited or disabled.
# NEVER allow this to work in production.
def become
raise Discourse::InvalidAccess.new unless Rails.env.development?
user = User.find_by_username(params[:session_id])
raise "User #{params[:session_id]} not found" if user.blank?
log_on_user(user)
redirect_to path("/")
end
def sso_login
raise Discourse::NotFound.new unless SiteSetting.enable_sso
sso = DiscourseSingleSignOn.parse(request.query_string)
if !sso.nonce_valid?
if SiteSetting.verbose_sso_logging
Rails.logger.warn("Verbose SSO log: Nonce has already expired\n\n#{sso.diagnostics}")
end
return render_sso_error(text: I18n.t("sso.timeout_expired"), status: 419)
end
if ScreenedIpAddress.should_block?(request.remote_ip)
if SiteSetting.verbose_sso_logging
Rails.logger.warn("Verbose SSO log: IP address is blocked #{request.remote_ip}\n\n#{sso.diagnostics}")
end
return render_sso_error(text: I18n.t("sso.unknown_error"), status: 500)
end
return_path = sso.return_path
sso.expire_nonce!
begin
if user = sso.lookup_or_create_user(request.remote_ip)
if SiteSetting.must_approve_users? && !user.approved?
if SiteSetting.sso_not_approved_url.present?
redirect_to SiteSetting.sso_not_approved_url
else
render_sso_error(text: I18n.t("sso.account_not_approved"), status: 403)
end
return
elsif !user.active?
activation = UserActivator.new(user, request, session, cookies)
activation.finish
session["user_created_message"] = activation.message
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redirect_to(users_account_created_path) && (return)
else
if SiteSetting.verbose_sso_logging
Rails.logger.warn("Verbose SSO log: User was logged on #{user.username}\n\n#{sso.diagnostics}")
end
log_on_user user
end
# If it's not a relative URL check the host
if return_path !~ /^\/[^\/]/
begin
uri = URI(return_path)
return_path = path("/") unless SiteSetting.sso_allows_all_return_paths || uri.host == Discourse.current_hostname
rescue
return_path = path("/")
end
end
redirect_to return_path
else
render_sso_error(text: I18n.t("sso.not_found"), status: 500)
end
rescue ActiveRecord::RecordInvalid => e
if SiteSetting.verbose_sso_logging
Rails.logger.warn(<<~EOF)
Verbose SSO log: Record was invalid: #{e.record.class.name} #{e.record.id}
#{e.record.errors.to_h}
Attributes:
#{e.record.attributes.slice(*SingleSignOn::ACCESSORS.map(&:to_s))}
SSO Diagnostics:
#{sso.diagnostics}
EOF
end
text = nil
# If there's a problem with the email we can explain that
if (e.record.is_a?(User) && e.record.errors[:email].present?)
if e.record.email.blank?
text = I18n.t("sso.no_email")
else
text = I18n.t("sso.email_error", email: ERB::Util.html_escape(e.record.email))
end
end
render_sso_error(text: text || I18n.t("sso.unknown_error"), status: 500)
rescue => e
message = "Failed to create or lookup user: #{e}."
message << "\n\n" << "-" * 100 << "\n\n"
message << sso.diagnostics
message << "\n\n" << "-" * 100 << "\n\n"
message << e.backtrace.join("\n")
Rails.logger.error(message)
render_sso_error(text: I18n.t("sso.unknown_error"), status: 500)
end
end
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def create
RateLimiter.new(nil, "login-hr-#{request.remote_ip}", SiteSetting.max_logins_per_ip_per_hour, 1.hour).performed!
RateLimiter.new(nil, "login-min-#{request.remote_ip}", SiteSetting.max_logins_per_ip_per_minute, 1.minute).performed!
params.require(:login)
params.require(:password)
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return invalid_credentials if params[:password].length > User.max_password_length
login = params[:login].strip
login = login[1..-1] if login[0] == "@"
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if user = User.find_by_username_or_email(login)
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# If their password is correct
unless user.confirm_password?(params[:password])
invalid_credentials
return
end
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# If the site requires user approval and the user is not approved yet
if login_not_approved_for?(user)
login_not_approved
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return
end
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# User signed on with username and password, so let's prevent the invite link
# from being used to log in (if one exists).
Invite.invalidate_for_email(user.email)
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else
invalid_credentials
return
end
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if user.suspended?
failed_to_login(user)
return
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end
if ScreenedIpAddress.should_block?(request.remote_ip)
return not_allowed_from_ip_address(user)
end
if ScreenedIpAddress.block_admin_login?(user, request.remote_ip)
return admin_not_allowed_from_ip_address(user)
end
(user.active && user.email_confirmed?) ? login(user) : not_activated(user)
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end
def forgot_password
params.require(:login)
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RateLimiter.new(nil, "forgot-password-hr-#{request.remote_ip}", 6, 1.hour).performed!
RateLimiter.new(nil, "forgot-password-min-#{request.remote_ip}", 3, 1.minute).performed!
RateLimiter.new(nil, "forgot-password-login-hour-#{params[:login].to_s[0..100]}", 12, 1.hour).performed!
RateLimiter.new(nil, "forgot-password-login-min-#{params[:login].to_s[0..100]}", 3, 1.minute).performed!
user = User.find_by_username_or_email(params[:login])
user_presence = user.present? && user.id > 0 && !user.staged
if user_presence
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email_token = user.email_tokens.create(email: user.email)
Jobs.enqueue(:critical_user_email, type: :forgot_password, user_id: user.id, email_token: email_token.token)
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end
json = { result: "ok" }
unless SiteSetting.forgot_password_strict
json[:user_found] = user_presence
end
render json: json
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rescue RateLimiter::LimitExceeded
render_json_error(I18n.t("rate_limiter.slow_down"))
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end
def current
if current_user.present?
render_serialized(current_user, CurrentUserSerializer)
else
render body: nil, status: 404
end
end
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def destroy
reset_session
log_off_user
if request.xhr?
render body: nil
else
redirect_to (params[:return_url] || path("/"))
end
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end
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protected
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def check_local_login_allowed
if SiteSetting.enable_sso || !SiteSetting.enable_local_logins
raise LocalLoginNotAllowed, "SSO takes over local login or the local login is disallowed."
end
end
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private
def login_not_approved_for?(user)
SiteSetting.must_approve_users? && !user.approved? && !user.admin?
end
def invalid_credentials
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render json: { error: I18n.t("login.incorrect_username_email_or_password") }
end
def login_not_approved
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render json: { error: I18n.t("login.not_approved") }
end
def not_activated(user)
session[ACTIVATE_USER_KEY] = user.id
render json: {
error: I18n.t("login.not_activated"),
reason: 'not_activated',
sent_to_email: user.find_email || user.email,
current_email: user.email
}
end
def not_allowed_from_ip_address(user)
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render json: { error: I18n.t("login.not_allowed_from_ip_address", username: user.username) }
end
def admin_not_allowed_from_ip_address(user)
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render json: { error: I18n.t("login.admin_not_allowed_from_ip_address", username: user.username) }
end
def failed_to_login(user)
message = user.suspend_reason ? "login.suspended_with_reason" : "login.suspended"
render json: {
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error: I18n.t(message, date: I18n.l(user.suspended_till, format: :date_only),
reason: Rack::Utils.escape_html(user.suspend_reason)),
reason: 'suspended'
}
end
def login(user)
session.delete(ACTIVATE_USER_KEY)
log_on_user(user)
if payload = session.delete(:sso_payload)
sso_provider(payload)
else
render_serialized(user, UserSerializer)
end
end
def render_sso_error(status:, text:)
@sso_error = text
render status: status, layout: 'no_ember'
end
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end