diff options
Diffstat (limited to 'actionpack/lib/action_dispatch/middleware/cookies.rb')
| -rw-r--r-- | actionpack/lib/action_dispatch/middleware/cookies.rb | 241 |
1 files changed, 125 insertions, 116 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/cookies.rb b/actionpack/lib/action_dispatch/middleware/cookies.rb index 533925ebe1..c45d947904 100644 --- a/actionpack/lib/action_dispatch/middleware/cookies.rb +++ b/actionpack/lib/action_dispatch/middleware/cookies.rb @@ -1,3 +1,5 @@ +# frozen_string_literal: true + require "active_support/core_ext/hash/keys" require "active_support/key_generator" require "active_support/message_verifier" @@ -47,6 +49,18 @@ module ActionDispatch get_header Cookies::AUTHENTICATED_ENCRYPTED_COOKIE_SALT end + def use_authenticated_cookie_encryption + get_header Cookies::USE_AUTHENTICATED_COOKIE_ENCRYPTION + end + + def encrypted_cookie_cipher + get_header Cookies::ENCRYPTED_COOKIE_CIPHER + end + + def signed_cookie_digest + get_header Cookies::SIGNED_COOKIE_DIGEST + end + def secret_token get_header Cookies::SECRET_TOKEN end @@ -62,6 +76,11 @@ module ActionDispatch def cookies_digest get_header Cookies::COOKIES_DIGEST end + + def cookies_rotations + get_header Cookies::COOKIES_ROTATIONS + end + # :startdoc: end @@ -81,16 +100,17 @@ module ActionDispatch # 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 } + # cookies[:login] = { value: "XJ-122", expires: 1.hour } + # + # # Sets a cookie that expires at a specific time. + # cookies[:login] = { value: "XJ-122", expires: Time.utc(2020, 10, 15, 5) } # # # 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 an encrypted cookie value before sending it to the client which # # prevent users from reading and tampering with its value. - # # The cookie is signed by your app's `secrets.secret_key_base` value. # # It can be read using the encrypted method `cookies.encrypted[:name]` # cookies.encrypted[:discount] = 45 # @@ -98,7 +118,7 @@ module ActionDispatch # cookies.permanent[:login] = "XJ-122" # # # You can also chain these methods: - # cookies.permanent.signed[:login] = "XJ-122" + # cookies.signed.permanent[:login] = "XJ-122" # # Examples of reading: # @@ -116,7 +136,7 @@ module ActionDispatch # # cookies[:name] = { # value: 'a yummy cookie', - # expires: 1.year.from_now, + # expires: 1.year, # domain: 'domain.com' # } # @@ -141,8 +161,8 @@ module ActionDispatch # # * <tt>:tld_length</tt> - When using <tt>:domain => :all</tt>, this option can be used to explicitly # set the TLD length when using a short (<= 3 character) domain that is being interpreted as part of a TLD. - # For example, to share cookies between user1.lvh.me and user2.lvh.me, set <tt>:tld_length</tt> to 1. - # * <tt>:expires</tt> - The time at which this cookie expires, as a \Time object. + # For example, to share cookies between user1.lvh.me and user2.lvh.me, set <tt>:tld_length</tt> to 2. + # * <tt>:expires</tt> - The time at which this cookie expires, as a \Time or ActiveSupport::Duration object. # * <tt>:secure</tt> - Whether this cookie is only transmitted to HTTPS servers. # Default is +false+. # * <tt>:httponly</tt> - Whether this cookie is accessible via scripting or @@ -154,10 +174,14 @@ module ActionDispatch ENCRYPTED_COOKIE_SALT = "action_dispatch.encrypted_cookie_salt".freeze ENCRYPTED_SIGNED_COOKIE_SALT = "action_dispatch.encrypted_signed_cookie_salt".freeze AUTHENTICATED_ENCRYPTED_COOKIE_SALT = "action_dispatch.authenticated_encrypted_cookie_salt".freeze + USE_AUTHENTICATED_COOKIE_ENCRYPTION = "action_dispatch.use_authenticated_cookie_encryption".freeze + ENCRYPTED_COOKIE_CIPHER = "action_dispatch.encrypted_cookie_cipher".freeze + SIGNED_COOKIE_DIGEST = "action_dispatch.signed_cookie_digest".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_DIGEST = "action_dispatch.cookies_digest".freeze + COOKIES_ROTATIONS = "action_dispatch.cookies_rotations".freeze # Cookies can typically store 4096 bytes. MAX_COOKIE_SIZE = 4096 @@ -186,10 +210,10 @@ module ActionDispatch # 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 +secrets.secret_token+ (deprecated) are both set, + # If +secret_key_base+ and +secrets.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+. + # This jar requires that you set a suitable secret for the verification on your app's +secret_key_base+. # # Example: # @@ -198,40 +222,28 @@ module ActionDispatch # # cookies.signed[:discount] # => 45 def signed - @signed ||= - if upgrade_legacy_signed_cookies? - UpgradeLegacySignedCookieJar.new(self) - else - SignedCookieJar.new(self) - end + @signed ||= SignedKeyRotatingCookieJar.new(self) 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 +secrets.secret_token+ (deprecated) are both set, + # If +secret_key_base+ and +secrets.secret_token+ (deprecated) are both set, # legacy cookies signed with the old key generator will be transparently upgraded. # # If +config.action_dispatch.encrypted_cookie_salt+ and +config.action_dispatch.encrypted_signed_cookie_salt+ # are both set, legacy cookies encrypted with HMAC AES-256-CBC will be transparently upgraded. # - # This jar requires that you set a suitable secret for the verification on your app's +secrets.secret_key_base+. + # This jar requires that you set a suitable secret for the verification on your app's +secret_key_base+. # # Example: # # cookies.encrypted[:discount] = 45 - # # => Set-Cookie: discount=ZS9ZZ1R4cG1pcUJ1bm80anhQang3dz09LS1mbDZDSU5scGdOT3ltQ2dTdlhSdWpRPT0%3D--ab54663c9f4e3bc340c790d6d2b71e92f5b60315; path=/ + # # => Set-Cookie: discount=DIQ7fw==--K3n//8vvnSbGq9dA--7Xh91HfLpwzbj1czhBiwOg==; path=/ # # cookies.encrypted[:discount] # => 45 def encrypted - @encrypted ||= - if upgrade_legacy_signed_cookies? - UpgradeLegacyEncryptedCookieJar.new(self) - elsif upgrade_legacy_hmac_aes_cbc_cookies? - UpgradeLegacyHmacAesCbcCookieJar.new(self) - else - EncryptedCookieJar.new(self) - end + @encrypted ||= EncryptedKeyRotatingCookieJar.new(self) end # Returns the +signed+ or +encrypted+ jar, preferring +encrypted+ if +secret_key_base+ is set. @@ -252,34 +264,18 @@ module ActionDispatch end def upgrade_legacy_hmac_aes_cbc_cookies? - request.secret_key_base.present? && - request.authenticated_encrypted_cookie_salt.present? && - request.encrypted_signed_cookie_salt.present? && - request.encrypted_cookie_salt.present? + request.secret_key_base.present? && + request.encrypted_signed_cookie_salt.present? && + request.encrypted_cookie_salt.present? && + request.use_authenticated_cookie_encryption end - end - # Passing the ActiveSupport::MessageEncryptor::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. - module VerifyAndUpgradeLegacySignedMessage # :nodoc: - def initialize(*args) - super - @legacy_verifier = ActiveSupport::MessageVerifier.new(request.secret_token, serializer: ActiveSupport::MessageEncryptor::NullSerializer) - end - - def verify_and_upgrade_legacy_signed_message(name, signed_message) - deserialize(name, @legacy_verifier.verify(signed_message)).tap do |value| - self[name] = { value: value } + def encrypted_cookie_cipher + request.encrypted_cookie_cipher || "aes-256-gcm" end - rescue ActiveSupport::MessageVerifier::InvalidSignature - nil - end - private - def parse(name, signed_message) - super || verify_and_upgrade_legacy_signed_message(name, signed_message) + def signed_cookie_digest + request.signed_cookie_digest || "SHA1" end end @@ -342,6 +338,9 @@ module ActionDispatch end alias :has_key? :key? + # Returns the cookies as Hash. + alias :to_hash :to_h + def update(other_hash) @cookies.update other_hash.stringify_keys self @@ -358,7 +357,11 @@ module ActionDispatch @cookies.map { |k, v| "#{escape(k)}=#{escape(v)}" }.join "; " end - def handle_options(options) #:nodoc: + def handle_options(options) # :nodoc: + if options[:expires].respond_to?(:from_now) + options[:expires] = options[:expires].from_now + end + options[:path] ||= "/" if options[:domain] == :all || options[:domain] == "all" @@ -486,6 +489,14 @@ module ActionDispatch def request; @parent_jar.request; end private + def expiry_options(options) + if options[:expires].respond_to?(:from_now) + { expires_in: options[:expires] } + else + { expires_at: options[:expires] } + end + end + def parse(name, data); data; end def commit(options); end end @@ -509,6 +520,7 @@ module ActionDispatch module SerializedCookieJars # :nodoc: MARSHAL_SIGNATURE = "\x04\x08".freeze + SERIALIZER = ActiveSupport::MessageEncryptor::NullSerializer protected def needs_migration?(value) @@ -519,12 +531,16 @@ module ActionDispatch serializer.dump(value) end - def deserialize(name, value) + def deserialize(name) + rotate = false + value = yield -> { rotate = true } + if value - if needs_migration?(value) - Marshal.load(value).tap do |v| - self[name] = { value: v } - end + case + when needs_migration?(value) + self[name] = Marshal.load(value) + when rotate + self[name] = serializer.load(value) else serializer.load(value) end @@ -546,104 +562,97 @@ module ActionDispatch def digest request.cookies_digest || "SHA1" end - - def key_generator - request.key_generator - end end - class SignedCookieJar < AbstractCookieJar # :nodoc: + class SignedKeyRotatingCookieJar < AbstractCookieJar # :nodoc: include SerializedCookieJars def initialize(parent_jar) super - secret = key_generator.generate_key(request.signed_cookie_salt) - @verifier = ActiveSupport::MessageVerifier.new(secret, digest: digest, serializer: ActiveSupport::MessageEncryptor::NullSerializer) + + secret = request.key_generator.generate_key(request.signed_cookie_salt) + @verifier = ActiveSupport::MessageVerifier.new(secret, digest: signed_cookie_digest, serializer: SERIALIZER) + + request.cookies_rotations.signed.each do |*secrets, **options| + @verifier.rotate(*secrets, serializer: SERIALIZER, **options) + end + + if upgrade_legacy_signed_cookies? + @verifier.rotate request.secret_token, serializer: SERIALIZER + end end private def parse(name, signed_message) - deserialize name, @verifier.verified(signed_message) + deserialize(name) do |rotate| + @verifier.verified(signed_message, on_rotation: rotate) + end end def commit(options) - options[:value] = @verifier.generate(serialize(options[:value])) + options[:value] = @verifier.generate(serialize(options[:value]), expiry_options(options)) raise CookieOverflow if options[:value].bytesize > MAX_COOKIE_SIZE end end - # UpgradeLegacySignedCookieJar is used instead of SignedCookieJar if - # secrets.secret_token and secrets.secret_key_base are both set. It reads - # legacy cookies signed with the old dummy key generator and signs and - # re-saves them using the new key generator to provide a smooth upgrade path. - class UpgradeLegacySignedCookieJar < SignedCookieJar #:nodoc: - include VerifyAndUpgradeLegacySignedMessage - end - - class EncryptedCookieJar < AbstractCookieJar # :nodoc: + class EncryptedKeyRotatingCookieJar < AbstractCookieJar # :nodoc: include SerializedCookieJars def initialize(parent_jar) super - 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." + if request.use_authenticated_cookie_encryption + key_len = ActiveSupport::MessageEncryptor.key_len(encrypted_cookie_cipher) + secret = request.key_generator.generate_key(request.authenticated_encrypted_cookie_salt, key_len) + @encryptor = ActiveSupport::MessageEncryptor.new(secret, cipher: encrypted_cookie_cipher, serializer: SERIALIZER) + else + key_len = ActiveSupport::MessageEncryptor.key_len("aes-256-cbc") + secret = request.key_generator.generate_key(request.encrypted_cookie_salt, key_len) + sign_secret = request.key_generator.generate_key(request.encrypted_signed_cookie_salt) + @encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret, cipher: "aes-256-cbc", serializer: SERIALIZER) + end + + request.cookies_rotations.encrypted.each do |*secrets, **options| + @encryptor.rotate(*secrets, serializer: SERIALIZER, **options) end - cipher = "aes-256-gcm" - key_len = ActiveSupport::MessageEncryptor.key_len(cipher) - secret = key_generator.generate_key(request.authenticated_encrypted_cookie_salt || "")[0, key_len] + if upgrade_legacy_hmac_aes_cbc_cookies? + legacy_cipher = "aes-256-cbc" + secret = request.key_generator.generate_key(request.encrypted_cookie_salt, ActiveSupport::MessageEncryptor.key_len(legacy_cipher)) + sign_secret = request.key_generator.generate_key(request.encrypted_signed_cookie_salt) - @encryptor = ActiveSupport::MessageEncryptor.new(secret, cipher: cipher, serializer: ActiveSupport::MessageEncryptor::NullSerializer) + @encryptor.rotate(secret, sign_secret, cipher: legacy_cipher, digest: digest, serializer: SERIALIZER) + end + + if upgrade_legacy_signed_cookies? + @legacy_verifier = ActiveSupport::MessageVerifier.new(request.secret_token, digest: digest, serializer: SERIALIZER) + end end private def parse(name, encrypted_message) - deserialize name, @encryptor.decrypt_and_verify(encrypted_message) - rescue ActiveSupport::MessageVerifier::InvalidSignature, ActiveSupport::MessageEncryptor::InvalidMessage - nil + deserialize(name) do |rotate| + @encryptor.decrypt_and_verify(encrypted_message, on_rotation: rotate) + end + rescue ActiveSupport::MessageEncryptor::InvalidMessage, ActiveSupport::MessageVerifier::InvalidSignature + parse_legacy_signed_message(name, encrypted_message) end def commit(options) - options[:value] = @encryptor.encrypt_and_sign(serialize(options[:value])) + options[:value] = @encryptor.encrypt_and_sign(serialize(options[:value]), expiry_options(options)) raise CookieOverflow if options[:value].bytesize > MAX_COOKIE_SIZE end - end - - # UpgradeLegacyEncryptedCookieJar is used by ActionDispatch::Session::CookieStore - # instead of EncryptedCookieJar if secrets.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 - end - - # UpgradeLegacyHmacAesCbcCookieJar is used by ActionDispatch::Session::CookieStore - # to upgrade cookies encrypted with AES-256-CBC with HMAC to AES-256-GCM - class UpgradeLegacyHmacAesCbcCookieJar < EncryptedCookieJar - def initialize(parent_jar) - super - secret = key_generator.generate_key(request.encrypted_cookie_salt || "")[0, ActiveSupport::MessageEncryptor.key_len] - sign_secret = key_generator.generate_key(request.encrypted_signed_cookie_salt || "") - - @legacy_encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret, cipher: "aes-256-cbc", digest: digest, serializer: ActiveSupport::MessageEncryptor::NullSerializer) - end + def parse_legacy_signed_message(name, legacy_signed_message) + if defined?(@legacy_verifier) + deserialize(name) do |rotate| + rotate.call - def decrypt_and_verify_legacy_encrypted_message(name, signed_message) - deserialize(name, @legacy_encryptor.decrypt_and_verify(signed_message)).tap do |value| - self[name] = { value: value } - end - rescue ActiveSupport::MessageVerifier::InvalidSignature, ActiveSupport::MessageEncryptor::InvalidMessage - nil - end - - private - def parse(name, signed_message) - super || decrypt_and_verify_legacy_encrypted_message(name, signed_message) + @legacy_verifier.verified(legacy_signed_message) + end + end end end |