diff options
Diffstat (limited to 'plugins/mod_http.lua')
| -rw-r--r-- | plugins/mod_http.lua | 85 |
1 files changed, 76 insertions, 9 deletions
diff --git a/plugins/mod_http.lua b/plugins/mod_http.lua index a1d409bd..cf63ecfb 100644 --- a/plugins/mod_http.lua +++ b/plugins/mod_http.lua @@ -7,13 +7,21 @@ -- module:set_global(); -module:depends("http_errors"); +pcall(function () + module:depends("http_errors"); +end); local portmanager = require "core.portmanager"; local moduleapi = require "core.moduleapi"; local url_parse = require "socket.url".parse; local url_build = require "socket.url".build; local normalize_path = require "util.http".normalize_path; +local set = require "util.set"; + +local ip_util = require "util.ip"; +local new_ip = ip_util.new_ip; +local match_ip = ip_util.match; +local parse_cidr = ip_util.parse_cidr; local server = require "net.http.server"; @@ -22,6 +30,12 @@ server.set_default_host(module:get_option_string("http_default_host")); server.set_option("body_size_limit", module:get_option_number("http_max_content_size")); server.set_option("buffer_size_limit", module:get_option_number("http_max_buffer_size")); +-- CORS settigs +local opt_methods = module:get_option_set("access_control_allow_methods", { "GET", "OPTIONS" }); +local opt_headers = module:get_option_set("access_control_allow_headers", { "Content-Type" }); +local opt_credentials = module:get_option_boolean("access_control_allow_credentials", false); +local opt_max_age = module:get_option_number("access_control_max_age", 2 * 60 * 60); + local function get_http_event(host, app_path, key) local method, path = key:match("^(%S+)%s+(.+)$"); if not method then -- No path specified, default to "" (base path) @@ -83,6 +97,16 @@ function moduleapi.http_url(module, app_name, default_path) return "http://disabled.invalid/"; end +local function apply_cors_headers(response, methods, headers, max_age, allow_credentials, origin) + response.headers.access_control_allow_methods = tostring(methods); + response.headers.access_control_allow_headers = tostring(headers); + response.headers.access_control_max_age = tostring(max_age) + response.headers.access_control_allow_origin = origin or "*"; + if allow_credentials then + response.headers.access_control_allow_credentials = "true"; + end +end + function module.add_host(module) local host = module.host; if host ~= "*" then @@ -101,9 +125,27 @@ function module.add_host(module) end apps[app_name] = apps[app_name] or {}; local app_handlers = apps[app_name]; + + local app_methods = opt_methods; + + local function cors_handler(event_data) + local request, response = event_data.request, event_data.response; + apply_cors_headers(response, app_methods, opt_headers, opt_max_age, opt_credentials, request.headers.origin); + end + + local function options_handler(event_data) + cors_handler(event_data); + return ""; + end + for key, handler in pairs(event.item.route or {}) do local event_name = get_http_event(host, app_path, key); if event_name then + local method = event_name:match("^%S+"); + if not app_methods:contains(method) then + app_methods = app_methods + set.new{ method }; + end + local options_event_name = event_name:gsub("^%S+", "OPTIONS"); if type(handler) ~= "function" then local data = handler; handler = function () return data; end @@ -119,8 +161,14 @@ function module.add_host(module) module:hook_object_event(server, event_name:sub(1, -2), redir_handler, -1); end if not app_handlers[event_name] then - app_handlers[event_name] = handler; + app_handlers[event_name] = { + main = handler; + cors = cors_handler; + options = options_handler; + }; module:hook_object_event(server, event_name, handler); + module:hook_object_event(server, event_name, cors_handler, 1); + module:hook_object_event(server, options_event_name, options_handler, -1); else module:log("warn", "App %s added handler twice for '%s', ignoring", app_name, event_name); end @@ -130,7 +178,7 @@ function module.add_host(module) end local services = portmanager.get_active_services(); if services:get("https") or services:get("http") then - module:log("debug", "Serving '%s' at %s", app_name, module:http_url(app_name, app_path)); + module:log("info", "Serving '%s' at %s", app_name, module:http_url(app_name, app_path)); else module:log("warn", "Not listening on any ports, '%s' will be unreachable", app_name); end @@ -139,8 +187,11 @@ function module.add_host(module) local function http_app_removed(event) local app_handlers = apps[event.item.name]; apps[event.item.name] = nil; - for event_name, handler in pairs(app_handlers) do - module:unhook_object_event(server, event_name, handler); + for event_name, handlers in pairs(app_handlers) do + module:unhook_object_event(server, event_name, handlers.main); + module:unhook_object_event(server, event_name, handlers.cors); + local options_event_name = event_name:gsub("^%S+", "OPTIONS"); + module:unhook_object_event(server, options_event_name, handlers.options); end end @@ -158,13 +209,31 @@ module.add_host(module); -- set up handling on global context too local trusted_proxies = module:get_option_set("trusted_proxies", { "127.0.0.1", "::1" })._items; +local function is_trusted_proxy(ip) + local parsed_ip = new_ip(ip) + for trusted_proxy in trusted_proxies do + if match_ip(parsed_ip, parse_cidr(trusted_proxy)) then + return true; + end + end + return false +end + local function get_ip_from_request(request) local ip = request.conn:ip(); local forwarded_for = request.headers.x_forwarded_for; if forwarded_for then + -- luacheck: ignore 631 + -- This logic looks weird at first, but it makes sense. + -- The for loop will take the last non-trusted-proxy IP from `forwarded_for`. + -- We append the original request IP to the header. Then, since the last IP wins, there are two cases: + -- Case a) The original request IP is *not* in trusted proxies, in which case the X-Forwarded-For header will, effectively, be ineffective; the original request IP will win because it overrides any other IP in the header. + -- Case b) The original request IP is in trusted proxies. In that case, the if branch in the for loop will skip the last IP, causing it to be ignored. The second-to-last IP will be taken instead. + -- Case c) If the second-to-last IP is also a trusted proxy, it will also be ignored, iteratively, up to the last IP which isn’t in trusted proxies. + -- Case d) If all IPs are in trusted proxies, something went obviously wrong and the logic never overwrites `ip`, leaving it at the original request IP. forwarded_for = forwarded_for..", "..ip; for forwarded_ip in forwarded_for:gmatch("[^%s,]+") do - if not trusted_proxies[forwarded_ip] then + if not is_trusted_proxy(forwarded_ip) then ip = forwarded_ip; end end @@ -195,10 +264,8 @@ module:provides("net", { listener = server.listener; default_port = 5281; encryption = "ssl"; - ssl_config = { - verify = "none"; - }; multiplex = { + protocol = "http/1.1"; pattern = "^[A-Z]"; }; }); |