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Diffstat (limited to 'actionpack/lib/action_dispatch/middleware/ssl.rb')
| -rw-r--r-- | actionpack/lib/action_dispatch/middleware/ssl.rb | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/ssl.rb b/actionpack/lib/action_dispatch/middleware/ssl.rb new file mode 100644 index 0000000000..fb2bfbb41e --- /dev/null +++ b/actionpack/lib/action_dispatch/middleware/ssl.rb @@ -0,0 +1,144 @@ +# frozen_string_literal: true + +module ActionDispatch + # This middleware is added to the stack when `config.force_ssl = true`, and is passed + # the options set in `config.ssl_options`. It does three jobs to enforce secure HTTP + # requests: + # + # 1. TLS redirect: Permanently redirects http:// requests to https:// + # with the same URL host, path, etc. Enabled by default. Set `config.ssl_options` + # to modify the destination URL + # (e.g. `redirect: { host: "secure.widgets.com", port: 8080 }`), or set + # `redirect: false` to disable this feature. + # + # 2. Secure cookies: Sets the `secure` flag on cookies to tell browsers they + # mustn't be sent along with http:// requests. Enabled by default. Set + # `config.ssl_options` with `secure_cookies: false` to disable this feature. + # + # 3. HTTP Strict Transport Security (HSTS): Tells the browser to remember + # this site as TLS-only and automatically redirect non-TLS requests. + # Enabled by default. Configure `config.ssl_options` with `hsts: false` to disable. + # + # Set `config.ssl_options` with `hsts: { … }` to configure HSTS: + # * `expires`: How long, in seconds, these settings will stick. The minimum + # required to qualify for browser preload lists is `18.weeks`. Defaults to + # `180.days` (recommended). + # * `subdomains`: Set to `true` to tell the browser to apply these settings + # to all subdomains. This protects your cookies from interception by a + # vulnerable site on a subdomain. Defaults to `true`. + # * `preload`: Advertise that this site may be included in browsers' + # preloaded HSTS lists. HSTS protects your site on every visit *except the + # first visit* since it hasn't seen your HSTS header yet. To close this + # gap, browser vendors include a baked-in list of HSTS-enabled sites. + # Go to https://hstspreload.appspot.com to submit your site for inclusion. + # Defaults to `false`. + # + # To turn off HSTS, omitting the header is not enough. Browsers will remember the + # original HSTS directive until it expires. Instead, use the header to tell browsers to + # expire HSTS immediately. Setting `hsts: false` is a shortcut for + # `hsts: { expires: 0 }`. + # + # Requests can opt-out of redirection with `exclude`: + # + # config.ssl_options = { redirect: { exclude: -> request { request.path =~ /healthcheck/ } } } + class SSL + # Default to 180 days, the low end for https://www.ssllabs.com/ssltest/ + # and greater than the 18-week requirement for browser preload lists. + HSTS_EXPIRES_IN = 15552000 + + def self.default_hsts_options + { expires: HSTS_EXPIRES_IN, subdomains: true, preload: false } + end + + def initialize(app, redirect: {}, hsts: {}, secure_cookies: true) + @app = app + + @redirect = redirect + + @exclude = @redirect && @redirect[:exclude] || proc { !@redirect } + @secure_cookies = secure_cookies + + @hsts_header = build_hsts_header(normalize_hsts_options(hsts)) + end + + def call(env) + request = Request.new env + + if request.ssl? + @app.call(env).tap do |status, headers, body| + set_hsts_header! headers + flag_cookies_as_secure! headers if @secure_cookies + end + else + return redirect_to_https request unless @exclude.call(request) + @app.call(env) + end + end + + private + def set_hsts_header!(headers) + headers["Strict-Transport-Security".freeze] ||= @hsts_header + end + + def normalize_hsts_options(options) + case options + # Explicitly disabling HSTS clears the existing setting from browsers + # by setting expiry to 0. + when false + self.class.default_hsts_options.merge(expires: 0) + # Default to enabled, with default options. + when nil, true + self.class.default_hsts_options + else + self.class.default_hsts_options.merge(options) + end + end + + # http://tools.ietf.org/html/rfc6797#section-6.1 + def build_hsts_header(hsts) + value = "max-age=#{hsts[:expires].to_i}".dup + value << "; includeSubDomains" if hsts[:subdomains] + value << "; preload" if hsts[:preload] + value + end + + def flag_cookies_as_secure!(headers) + if cookies = headers["Set-Cookie".freeze] + cookies = cookies.split("\n".freeze) + + headers["Set-Cookie".freeze] = cookies.map { |cookie| + if cookie !~ /;\s*secure\s*(;|$)/i + "#{cookie}; secure" + else + cookie + end + }.join("\n".freeze) + end + end + + def redirect_to_https(request) + [ @redirect.fetch(:status, redirection_status(request)), + { "Content-Type" => "text/html", + "Location" => https_location_for(request) }, + @redirect.fetch(:body, []) ] + end + + def redirection_status(request) + if request.get? || request.head? + 301 # Issue a permanent redirect via a GET request. + else + 307 # Issue a fresh request redirect to preserve the HTTP method. + end + end + + def https_location_for(request) + host = @redirect[:host] || request.host + port = @redirect[:port] || request.port + + location = "https://#{host}".dup + location << ":#{port}" if port != 80 && port != 443 + location << request.fullpath + location + end + end +end |