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# frozen_string_literal: true
# Backing store for GitLab session data.
#
# The raw session information is stored by the Rails session store
# (config/initializers/session_store.rb). These entries are accessible by the
# rack_key_name class method and consistute the base of the session data
# entries. All other entries in the session store can be traced back to these
# entries.
#
# After a user logs in (config/initializers/warden.rb) a further entry is made
# in Redis. This entry holds a record of the user's logged in session. These
# are accessible with the key_name(user_id, session_id) class method. These
# entries will expire. Lookups to these entries are lazilly cleaned on future
# user access.
#
# There is a reference to all sessions that belong to a specific user. A
# user may login through multiple browsers/devices and thus record multiple
# login sessions. These are accessible through the lookup_key_name(user_id)
# class method.
#
class ActiveSession
include ActiveModel::Model
SESSION_BATCH_SIZE = 200
ALLOWED_NUMBER_OF_ACTIVE_SESSIONS = 100
attr_accessor :created_at, :updated_at,
:ip_address, :browser, :os,
:device_name, :device_type,
:is_impersonated, :session_id, :session_private_id
def current?(rack_session)
return false if session_private_id.nil? || rack_session.id.nil?
# Rack v2.0.8+ added private_id, which uses the hash of the
# public_id to avoid timing attacks.
session_private_id == rack_session.id.private_id
end
def human_device_type
device_type&.titleize
end
def self.set(user, request)
Gitlab::Redis::SharedState.with do |redis|
session_private_id = request.session.id.private_id
client = DeviceDetector.new(request.user_agent)
timestamp = Time.current
active_user_session = new(
ip_address: request.remote_ip,
browser: client.name,
os: client.os_name,
device_name: client.device_name,
device_type: client.device_type,
created_at: user.current_sign_in_at || timestamp,
updated_at: timestamp,
session_private_id: session_private_id,
is_impersonated: request.session[:impersonator_id].present?
)
redis.pipelined do
redis.setex(
key_name(user.id, session_private_id),
Settings.gitlab['session_expire_delay'] * 60,
Marshal.dump(active_user_session)
)
redis.sadd(
lookup_key_name(user.id),
session_private_id
)
end
end
end
def self.list(user)
Gitlab::Redis::SharedState.with do |redis|
cleaned_up_lookup_entries(redis, user).map do |raw_session|
load_raw_session(raw_session)
end
end
end
def self.cleanup(user)
Gitlab::Redis::SharedState.with do |redis|
clean_up_old_sessions(redis, user)
cleaned_up_lookup_entries(redis, user)
end
end
def self.destroy_sessions(redis, user, session_ids)
key_names = session_ids.map { |session_id| key_name(user.id, session_id) }
redis.srem(lookup_key_name(user.id), session_ids)
Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
redis.del(key_names)
redis.del(rack_session_keys(session_ids))
end
end
def self.destroy_session(user, session_id)
return unless session_id
Gitlab::Redis::SharedState.with do |redis|
destroy_sessions(redis, user, [session_id].compact)
end
end
def self.destroy_all_but_current(user, current_rack_session)
sessions = not_impersonated(user)
sessions.reject! { |session| session.current?(current_rack_session) } if current_rack_session
Gitlab::Redis::SharedState.with do |redis|
session_ids = (sessions.map(&:session_id) | sessions.map(&:session_private_id)).compact
destroy_sessions(redis, user, session_ids) if session_ids.any?
end
end
def self.not_impersonated(user)
list(user).reject(&:is_impersonated)
end
def self.rack_key_name(session_id)
"#{Gitlab::Redis::SharedState::SESSION_NAMESPACE}:#{session_id}"
end
def self.key_name(user_id, session_id = '*')
"#{Gitlab::Redis::SharedState::USER_SESSIONS_NAMESPACE}:#{user_id}:#{session_id}"
end
def self.lookup_key_name(user_id)
"#{Gitlab::Redis::SharedState::USER_SESSIONS_LOOKUP_NAMESPACE}:#{user_id}"
end
def self.list_sessions(user)
sessions_from_ids(session_ids_for_user(user.id))
end
# Lists the relevant session IDs for the user.
#
# Returns an array of strings
def self.session_ids_for_user(user_id)
Gitlab::Redis::SharedState.with do |redis|
redis.smembers(lookup_key_name(user_id))
end
end
# Lists the session Hash objects for the given session IDs.
#
# session_ids - An array of strings
#
# Returns an array of ActiveSession objects
def self.sessions_from_ids(session_ids)
return [] if session_ids.empty?
Gitlab::Redis::SharedState.with do |redis|
session_keys = rack_session_keys(session_ids)
session_keys.each_slice(SESSION_BATCH_SIZE).flat_map do |session_keys_batch|
Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
redis.mget(session_keys_batch).compact.map do |raw_session|
load_raw_session(raw_session)
end
end
end
end
end
# Deserializes a session Hash object from Redis.
#
# raw_session - Raw bytes from Redis
#
# Returns an ActiveSession object
def self.load_raw_session(raw_session)
# rubocop:disable Security/MarshalLoad
Marshal.load(raw_session)
# rubocop:enable Security/MarshalLoad
end
def self.rack_session_keys(rack_session_ids)
rack_session_ids.map { |session_id| rack_key_name(session_id)}
end
def self.raw_active_session_entries(redis, session_ids, user_id)
return [] if session_ids.empty?
entry_keys = session_ids.map { |session_id| key_name(user_id, session_id) }
Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
redis.mget(entry_keys)
end
end
def self.active_session_entries(session_ids, user_id, redis)
return [] if session_ids.empty?
entry_keys = raw_active_session_entries(redis, session_ids, user_id)
entry_keys.compact.map do |raw_session|
load_raw_session(raw_session)
end
end
def self.clean_up_old_sessions(redis, user)
session_ids = session_ids_for_user(user.id)
return if session_ids.count <= ALLOWED_NUMBER_OF_ACTIVE_SESSIONS
# remove sessions if there are more than ALLOWED_NUMBER_OF_ACTIVE_SESSIONS.
sessions = active_session_entries(session_ids, user.id, redis)
sessions.sort_by! {|session| session.updated_at }.reverse!
destroyable_sessions = sessions.drop(ALLOWED_NUMBER_OF_ACTIVE_SESSIONS)
destroyable_session_ids = destroyable_sessions.flat_map { |session| [session.session_id, session.session_private_id] }.compact
destroy_sessions(redis, user, destroyable_session_ids) if destroyable_session_ids.any?
end
# Cleans up the lookup set by removing any session IDs that are no longer present.
#
# Returns an array of marshalled ActiveModel objects that are still active.
def self.cleaned_up_lookup_entries(redis, user)
session_ids = session_ids_for_user(user.id)
entries = raw_active_session_entries(redis, session_ids, user.id)
# remove expired keys.
# only the single key entries are automatically expired by redis, the
# lookup entries in the set need to be removed manually.
session_ids_and_entries = session_ids.zip(entries)
redis.pipelined do
session_ids_and_entries.reject { |_session_id, entry| entry }.each do |session_id, _entry|
redis.srem(lookup_key_name(user.id), session_id)
end
end
entries.compact
end
end
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