require 'active_support/core_ext/hash/keys' require 'active_support/core_ext/module/attribute_accessors' require 'active_support/core_ext/object/blank' require 'active_support/key_generator' require 'active_support/message_verifier' module ActionDispatch class Request < Rack::Request def cookie_jar env['action_dispatch.cookies'] ||= Cookies::CookieJar.build(self) end end # \Cookies are read and written through ActionController#cookies. # # The cookies being read are the ones received along with the request, the cookies # being written will be sent out with the response. Reading a cookie does not get # the cookie object itself back, just the value it holds. # # Examples of writing: # # # Sets a simple session cookie. # # This cookie will be deleted when the user's browser is closed. # cookies[:user_name] = "david" # # # Cookie values are String based. Other data types need to be serialized. # cookies[:lat_lon] = JSON.generate([47.68, -122.37]) # # # Sets a cookie that expires in 1 hour. # cookies[:login] = { value: "XJ-122", expires: 1.hour.from_now } # # # Sets a signed cookie, which prevents users from tampering with its value. # # The cookie is signed by your app's `secrets.secret_key_base` value. # # It can be read using the signed method `cookies.signed[:name]` # cookies.signed[:user_id] = current_user.id # # # Sets a "permanent" cookie (which expires in 20 years from now). # cookies.permanent[:login] = "XJ-122" # # # You can also chain these methods: # cookies.permanent.signed[:login] = "XJ-122" # # Examples of reading: # # cookies[:user_name] # => "david" # cookies.size # => 2 # JSON.parse(cookies[:lat_lon]) # => [47.68, -122.37] # cookies.signed[:login] # => "XJ-122" # # Example for deleting: # # cookies.delete :user_name # # Please note that if you specify a :domain when setting a cookie, you must also specify the domain when deleting the cookie: # # cookies[:name] = { # value: 'a yummy cookie', # expires: 1.year.from_now, # domain: 'domain.com' # } # # cookies.delete(:name, domain: 'domain.com') # # The option symbols for setting cookies are: # # * :value - The cookie's value. # * :path - The path for which this cookie applies. Defaults to the root # of the application. # * :domain - The domain for which this cookie applies so you can # restrict to the domain level. If you use a schema like www.example.com # and want to share session with user.example.com set :domain # to :all. Make sure to specify the :domain option with # :all again when deleting cookies. # # domain: nil # Does not sets cookie domain. (default) # domain: :all # Allow the cookie for the top most level # domain and subdomains. # # * :expires - The time at which this cookie expires, as a \Time object. # * :secure - Whether this cookie is only transmitted to HTTPS servers. # Default is +false+. # * :httponly - Whether this cookie is accessible via scripting or # only HTTP. Defaults to +false+. class Cookies HTTP_HEADER = "Set-Cookie".freeze GENERATOR_KEY = "action_dispatch.key_generator".freeze SIGNED_COOKIE_SALT = "action_dispatch.signed_cookie_salt".freeze ENCRYPTED_COOKIE_SALT = "action_dispatch.encrypted_cookie_salt".freeze ENCRYPTED_SIGNED_COOKIE_SALT = "action_dispatch.encrypted_signed_cookie_salt".freeze SECRET_TOKEN = "action_dispatch.secret_token".freeze SECRET_KEY_BASE = "action_dispatch.secret_key_base".freeze COOKIES_SERIALIZER = "action_dispatch.cookies_serializer".freeze # Cookies can typically store 4096 bytes. MAX_COOKIE_SIZE = 4096 # Raised when storing more than 4K of session data. CookieOverflow = Class.new StandardError # Include in a cookie jar to allow chaining, e.g. cookies.permanent.signed module ChainedCookieJars # Returns a jar that'll automatically set the assigned cookies to have an expiration date 20 years from now. Example: # # cookies.permanent[:prefers_open_id] = true # # => Set-Cookie: prefers_open_id=true; path=/; expires=Sun, 16-Dec-2029 03:24:16 GMT # # This jar is only meant for writing. You'll read permanent cookies through the regular accessor. # # This jar allows chaining with the signed jar as well, so you can set permanent, signed cookies. Examples: # # cookies.permanent.signed[:remember_me] = current_user.id # # => Set-Cookie: remember_me=BAhU--848956038e692d7046deab32b7131856ab20e14e; path=/; expires=Sun, 16-Dec-2029 03:24:16 GMT def permanent @permanent ||= PermanentCookieJar.new(self, @key_generator, @options) end # Returns a jar that'll automatically generate a signed representation of cookie value and verify it when reading from # the cookie again. This is useful for creating cookies with values that the user is not supposed to change. If a signed # cookie was tampered with by the user (or a 3rd party), nil will be returned. # # If +secrets.secret_key_base+ and +config.secret_token+ (deprecated) are both set, # legacy cookies signed with the old key generator will be transparently upgraded. # # This jar requires that you set a suitable secret for the verification on your app's +secrets.secret_key_base+. # # Example: # # cookies.signed[:discount] = 45 # # => Set-Cookie: discount=BAhpMg==--2c1c6906c90a3bc4fd54a51ffb41dffa4bf6b5f7; path=/ # # cookies.signed[:discount] # => 45 def signed @signed ||= if @options[:upgrade_legacy_signed_cookies] UpgradeLegacySignedCookieJar.new(self, @key_generator, @options) else SignedCookieJar.new(self, @key_generator, @options) end end # Returns a jar that'll automatically encrypt cookie values before sending them to the client and will decrypt them for read. # If the cookie was tampered with by the user (or a 3rd party), nil will be returned. # # If +secrets.secret_key_base+ and +config.secret_token+ (deprecated) are both set, # legacy cookies signed with the old key generator will be transparently upgraded. # # This jar requires that you set a suitable secret for the verification on your app's +secrets.secret_key_base+. # # Example: # # cookies.encrypted[:discount] = 45 # # => Set-Cookie: discount=ZS9ZZ1R4cG1pcUJ1bm80anhQang3dz09LS1mbDZDSU5scGdOT3ltQ2dTdlhSdWpRPT0%3D--ab54663c9f4e3bc340c790d6d2b71e92f5b60315; path=/ # # cookies.encrypted[:discount] # => 45 def encrypted @encrypted ||= if @options[:upgrade_legacy_signed_cookies] UpgradeLegacyEncryptedCookieJar.new(self, @key_generator, @options) else EncryptedCookieJar.new(self, @key_generator, @options) end end # Returns the +signed+ or +encrypted+ jar, preferring +encrypted+ if +secret_key_base+ is set. # Used by ActionDispatch::Session::CookieStore to avoid the need to introduce new cookie stores. def signed_or_encrypted @signed_or_encrypted ||= if @options[:secret_key_base].present? encrypted else signed end end end module VerifyAndUpgradeLegacySignedMessage def initialize(*args) super @legacy_verifier = ActiveSupport::MessageVerifier.new(@options[:secret_token]) end def verify_and_upgrade_legacy_signed_message(name, signed_message) @legacy_verifier.verify(signed_message).tap do |value| self[name] = { value: value } end rescue ActiveSupport::MessageVerifier::InvalidSignature nil end end class CookieJar #:nodoc: include Enumerable, ChainedCookieJars # This regular expression is used to split the levels of a domain. # The top level domain can be any string without a period or # **.**, ***.** style TLDs like co.uk or com.au # # www.example.co.uk gives: # $& => example.co.uk # # example.com gives: # $& => example.com # # lots.of.subdomains.example.local gives: # $& => example.local DOMAIN_REGEXP = /[^.]*\.([^.]*|..\...|...\...)$/ def self.options_for_env(env) #:nodoc: { signed_cookie_salt: env[SIGNED_COOKIE_SALT] || '', encrypted_cookie_salt: env[ENCRYPTED_COOKIE_SALT] || '', encrypted_signed_cookie_salt: env[ENCRYPTED_SIGNED_COOKIE_SALT] || '', secret_token: env[SECRET_TOKEN], secret_key_base: env[SECRET_KEY_BASE], upgrade_legacy_signed_cookies: env[SECRET_TOKEN].present? && env[SECRET_KEY_BASE].present?, serializer: env[COOKIES_SERIALIZER] } end def self.build(request) env = request.env key_generator = env[GENERATOR_KEY] options = options_for_env env host = request.host secure = request.ssl? new(key_generator, host, secure, options).tap do |hash| hash.update(request.cookies) end end def initialize(key_generator, host = nil, secure = false, options = {}) @key_generator = key_generator @set_cookies = {} @delete_cookies = {} @host = host @secure = secure @options = options @cookies = {} end def each(&block) @cookies.each(&block) end # Returns the value of the cookie by +name+, or +nil+ if no such cookie exists. def [](name) @cookies[name.to_s] end def fetch(name, *args, &block) @cookies.fetch(name.to_s, *args, &block) end def key?(name) @cookies.key?(name.to_s) end alias :has_key? :key? def update(other_hash) @cookies.update other_hash.stringify_keys self end def handle_options(options) #:nodoc: options[:path] ||= "/" if options[:domain] == :all # if there is a provided tld length then we use it otherwise default domain regexp domain_regexp = options[:tld_length] ? /([^.]+\.?){#{options[:tld_length]}}$/ : DOMAIN_REGEXP # if host is not ip and matches domain regexp # (ip confirms to domain regexp so we explicitly check for ip) options[:domain] = if (@host !~ /^[\d.]+$/) && (@host =~ domain_regexp) ".#{$&}" end elsif options[:domain].is_a? Array # if host matches one of the supplied domains without a dot in front of it options[:domain] = options[:domain].find {|domain| @host.include? domain.sub(/^\./, '') } end end # Sets the cookie named +name+. The second argument may be the very cookie # value, or a hash of options as documented above. def []=(name, options) if options.is_a?(Hash) options.symbolize_keys! value = options[:value] else value = options options = { :value => value } end handle_options(options) if @cookies[name.to_s] != value or options[:expires] @cookies[name.to_s] = value @set_cookies[name.to_s] = options @delete_cookies.delete(name.to_s) end value end # Removes the cookie on the client machine by setting the value to an empty string # and the expiration date in the past. Like []=, you can pass in # an options hash to delete cookies with extra data such as a :path. def delete(name, options = {}) return unless @cookies.has_key? name.to_s options.symbolize_keys! handle_options(options) value = @cookies.delete(name.to_s) @delete_cookies[name.to_s] = options value end # Whether the given cookie is to be deleted by this CookieJar. # Like []=, you can pass in an options hash to test if a # deletion applies to a specific :path, :domain etc. def deleted?(name, options = {}) options.symbolize_keys! handle_options(options) @delete_cookies[name.to_s] == options end # Removes all cookies on the client machine by calling delete for each cookie def clear(options = {}) @cookies.each_key{ |k| delete(k, options) } end def write(headers) @set_cookies.each { |k, v| ::Rack::Utils.set_cookie_header!(headers, k, v) if write_cookie?(v) } @delete_cookies.each { |k, v| ::Rack::Utils.delete_cookie_header!(headers, k, v) } end def recycle! #:nodoc: @set_cookies.clear @delete_cookies.clear end mattr_accessor :always_write_cookie self.always_write_cookie = false private def write_cookie?(cookie) @secure || !cookie[:secure] || always_write_cookie end end class PermanentCookieJar #:nodoc: include ChainedCookieJars def initialize(parent_jar, key_generator, options = {}) @parent_jar = parent_jar @key_generator = key_generator @options = options end def [](name) @parent_jar[name.to_s] end def []=(name, options) if options.is_a?(Hash) options.symbolize_keys! else options = { :value => options } end options[:expires] = 20.years.from_now @parent_jar[name] = options end end class JsonSerializer def self.load(value) JSON.parse(value, quirks_mode: true) end def self.dump(value) JSON.generate(value, quirks_mode: true) end end # Passing the NullSerializer downstream to the Message{Encryptor,Verifier} # allows us to handle the (de)serialization step within the cookie jar, # which gives us the opportunity to detect and migrate legacy cookies. class NullSerializer def self.load(value) value end def self.dump(value) value end end module SerializedCookieJars MARSHAL_SIGNATURE = "\x04\x08".freeze protected def needs_migration?(value) @options[:serializer] == :hybrid && value.start_with?(MARSHAL_SIGNATURE) end def serialize(name, value) serializer.dump(value) end def deserialize(name, value) if value if needs_migration?(value) Marshal.load(value).tap do |v| self[name] = { value: v } end else serializer.load(value) end end end def serializer serializer = @options[:serializer] || :marshal case serializer when :marshal Marshal when :json, :hybrid JsonSerializer else serializer end end end class SignedCookieJar #:nodoc: include ChainedCookieJars include SerializedCookieJars def initialize(parent_jar, key_generator, options = {}) @parent_jar = parent_jar @options = options secret = key_generator.generate_key(@options[:signed_cookie_salt]) @verifier = ActiveSupport::MessageVerifier.new(secret, serializer: NullSerializer) end def [](name) if signed_message = @parent_jar[name] deserialize name, verify(signed_message) end end def []=(name, options) if options.is_a?(Hash) options.symbolize_keys! options[:value] = @verifier.generate(serialize(name, options[:value])) else options = { :value => @verifier.generate(serialize(name, options)) } end raise CookieOverflow if options[:value].size > MAX_COOKIE_SIZE @parent_jar[name] = options end private def verify(signed_message) @verifier.verify(signed_message) rescue ActiveSupport::MessageVerifier::InvalidSignature nil end end # UpgradeLegacySignedCookieJar is used instead of SignedCookieJar if # config.secret_token and secrets.secret_key_base are both set. It reads # legacy cookies signed with the old dummy key generator and re-saves # them using the new key generator to provide a smooth upgrade path. class UpgradeLegacySignedCookieJar < SignedCookieJar #:nodoc: include VerifyAndUpgradeLegacySignedMessage def [](name) if signed_message = @parent_jar[name] deserialize(name, verify(signed_message)) || verify_and_upgrade_legacy_signed_message(name, signed_message) end end end class EncryptedCookieJar #:nodoc: include ChainedCookieJars include SerializedCookieJars def initialize(parent_jar, key_generator, options = {}) if ActiveSupport::LegacyKeyGenerator === key_generator raise "You didn't set secrets.secret_key_base, which is required for this cookie jar. " + "Read the upgrade documentation to learn more about this new config option." end @parent_jar = parent_jar @options = options secret = key_generator.generate_key(@options[:encrypted_cookie_salt]) sign_secret = key_generator.generate_key(@options[:encrypted_signed_cookie_salt]) @encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret, serializer: NullSerializer) end def [](name) if encrypted_message = @parent_jar[name] deserialize name, decrypt_and_verify(encrypted_message) end end def []=(name, options) if options.is_a?(Hash) options.symbolize_keys! else options = { :value => options } end options[:value] = @encryptor.encrypt_and_sign(serialize(name, options[:value])) raise CookieOverflow if options[:value].size > MAX_COOKIE_SIZE @parent_jar[name] = options end private def decrypt_and_verify(encrypted_message) @encryptor.decrypt_and_verify(encrypted_message) rescue ActiveSupport::MessageVerifier::InvalidSignature, ActiveSupport::MessageEncryptor::InvalidMessage nil end end # UpgradeLegacyEncryptedCookieJar is used by ActionDispatch::Session::CookieStore # instead of EncryptedCookieJar if config.secret_token and secrets.secret_key_base # are both set. It reads legacy cookies signed with the old dummy key generator and # encrypts and re-saves them using the new key generator to provide a smooth upgrade path. class UpgradeLegacyEncryptedCookieJar < EncryptedCookieJar #:nodoc: include VerifyAndUpgradeLegacySignedMessage def [](name) if encrypted_or_signed_message = @parent_jar[name] deserialize(name, decrypt_and_verify(encrypted_or_signed_message)) || verify_and_upgrade_legacy_signed_message(name, encrypted_or_signed_message) end end end def initialize(app) @app = app end def call(env) status, headers, body = @app.call(env) if cookie_jar = env['action_dispatch.cookies'] cookie_jar.write(headers) if headers[HTTP_HEADER].respond_to?(:join) headers[HTTP_HEADER] = headers[HTTP_HEADER].join("\n") end end [status, headers, body] end end end