397 lines
13 KiB
Lua
397 lines
13 KiB
Lua
--
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-- access.lua
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--
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-- This file is executed at every request on a protected domain or server.
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-- You just have to read this file normally to understand how and when the
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-- request is handled: redirected, forbidden, bypassed or served.
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--
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-- Get the `cache` persistent shared table
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local cache = ngx.shared.cache
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-- Generate a unique token if it has not been generated yet
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srvkey = cache:get("srvkey")
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if not srvkey then
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srvkey = random_string()
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cache:add("srvkey", srvkey)
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end
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-- Initialize and get configuration
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local conf = config.get_config()
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-- Import helpers
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local hlp = require "helpers"
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-- Just a note for the client to know that he passed through the SSO
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ngx.header["X-SSO-WAT"] = "You've just been SSOed"
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--
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-- 1. LOGIN
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--
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-- example: https://mydomain.org/?sso_login=a6e5320f
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--
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-- If the `sso_login` URI argument is set, try a cross-domain authentication
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-- with the token passed as argument
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--
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if ngx.var.host ~= conf["portal_domain"] and ngx.var.request_method == "GET" then
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uri_args = ngx.req.get_uri_args()
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if uri_args[conf.login_arg] then
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cda_key = uri_args[conf.login_arg]
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-- Use the `cache` shared table where a username is associated with
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-- a CDA key
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user = cache:get(cda_key)
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if user then
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hlp.set_auth_cookie(user, ngx.var.host)
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ngx.log(ngx.NOTICE, "Cross-domain authentication: "..user.." connected on "..ngx.var.host)
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cache:delete(cda_key)
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end
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uri_args[conf.login_arg] = nil
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return hlp.redirect(ngx.var.uri..hlp.uri_args_string(uri_args))
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end
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end
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--
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-- 2. PORTAL
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--
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-- example: https://mydomain.org/ssowat*
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--
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-- If the URL matches the portal URL, serve a portal file or proceed to a
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-- portal operation
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--
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if ngx.var.host == conf["portal_domain"]
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and hlp.string.starts(ngx.var.uri, string.sub(conf["portal_path"], 1, -2))
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then
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-- `GET` method will serve a portal file
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if ngx.var.request_method == "GET" then
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-- Force portal scheme
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if ngx.var.scheme ~= conf["portal_scheme"] then
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return hlp.redirect(conf.portal_url)
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end
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-- Add a trailing `/` if not present
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if ngx.var.uri.."/" == conf["portal_path"] then
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return hlp.redirect(conf.portal_url)
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end
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-- Get request arguments
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uri_args = ngx.req.get_uri_args()
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-- Logout is also called via a `GET` method
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-- TODO: change this ?
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if uri_args.action and uri_args.action == 'logout' then
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return hlp.logout()
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-- If the `r` URI argument is set, it means that we want to
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-- be redirected (typically after a login phase)
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elseif hlp.is_logged_in() and uri_args.r then
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-- Decode back url
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back_url = ngx.decode_base64(uri_args.r)
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-- If `back_url` contains line break, someone is probably trying to
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-- pass some additional headers
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if string.match(back_url, "(.*)\n") then
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hlp.flash("fail", hlp.t("redirection_error_invalid_url"))
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ngx.log(ngx.ERR, "Redirection url is invalid")
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return hlp.redirect(conf.portal_url)
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end
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-- Get managed domains
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conf = config.get_config()
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local managed_domain = false
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for _, domain in ipairs(conf["domains"]) do
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local escaped_domain = domain:gsub("-", "%%-") -- escape dash for pattern matching
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if string.match(back_url, "^http[s]?://"..escaped_domain.."/") then
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ngx.log(ngx.INFO, "Redirection to a managed domain found")
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managed_domain = true
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break
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end
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end
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-- If redirection does not match one of the managed domains
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-- redirect to portal home page
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if not managed_domain then
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hlp.flash("fail", hlp.t("redirection_error_unmanaged_domain"))
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ngx.log(ngx.ERR, "Redirection to an external domain aborted")
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return hlp.redirect(conf.portal_url)
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end
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-- In case the `back_url` is not on the same domain than the
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-- current one, create a redirection with a CDA key
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local ngx_host_escaped = ngx.var.host:gsub("-", "%%-") -- escape dash for pattern matching
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if not string.match(back_url, "^http[s]?://"..ngx_host_escaped.."/")
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and not string.match(back_url, ".*"..conf.login_arg.."=%d+$") then
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local cda_key = hlp.set_cda_key()
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if string.match(back_url, ".*?.*") then
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back_url = back_url.."&"
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else
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back_url = back_url.."?"
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end
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back_url = back_url.."sso_login="..cda_key
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end
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return hlp.redirect(back_url)
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-- In case we want to serve portal login or assets for portal, just
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-- serve it
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elseif hlp.is_logged_in()
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or ngx.var.uri == conf["portal_path"]
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or (hlp.string.starts(ngx.var.uri, conf["portal_path"].."assets")
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and (not ngx.var.http_referer
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or hlp.string.starts(ngx.var.http_referer, conf.portal_url)))
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then
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return hlp.serve(ngx.var.uri)
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-- If all the previous cases have failed, redirect to portal
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else
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hlp.flash("info", hlp.t("please_login"))
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return hlp.redirect(conf.portal_url)
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end
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-- `POST` method is basically use to achieve editing operations
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elseif ngx.var.request_method == "POST" then
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-- CSRF protection, only proceed if we are editing from the same
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-- domain
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if hlp.string.starts(ngx.var.http_referer, conf.portal_url) then
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if hlp.string.ends(ngx.var.uri, conf["portal_path"].."password.html")
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or hlp.string.ends(ngx.var.uri, conf["portal_path"].."edit.html")
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then
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return hlp.edit_user()
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else
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return hlp.login()
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end
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else
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-- Redirect to portal
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hlp.flash("fail", hlp.t("please_login_from_portal"))
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return hlp.redirect(conf.portal_url)
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end
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end
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end
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--
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-- 3. Redirected URLs
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--
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-- If the URL matches one of the `redirected_urls` in the configuration file,
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-- just redirect to the target URL/URI
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--
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function detect_redirection(redirect_url)
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if hlp.string.starts(redirect_url, "http://")
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or hlp.string.starts(redirect_url, "https://") then
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return hlp.redirect(redirect_url)
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elseif hlp.string.starts(redirect_url, "/") then
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return hlp.redirect(ngx.var.scheme.."://"..ngx.var.host..redirect_url)
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else
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return hlp.redirect(ngx.var.scheme.."://"..redirect_url)
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end
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end
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if conf["redirected_urls"] then
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for url, redirect_url in pairs(conf["redirected_urls"]) do
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if url == ngx.var.host..ngx.var.uri..hlp.uri_args_string()
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or url == ngx.var.scheme.."://"..ngx.var.host..ngx.var.uri..hlp.uri_args_string()
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or url == ngx.var.uri..hlp.uri_args_string() then
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detect_redirection(redirect_url)
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end
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end
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end
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if conf["redirected_regex"] then
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for regex, redirect_url in pairs(conf["redirected_regex"]) do
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if string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
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or string.match(ngx.var.scheme.."://"..ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
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or string.match(ngx.var.uri..hlp.uri_args_string(), regex) then
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detect_redirection(redirect_url)
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end
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end
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end
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--
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-- 4. Protected URLs
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--
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-- If the URL matches one of the `protected_urls` in the configuration file,
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-- we have to protect it even if the URL is also set in the `unprotected_urls`.
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-- It could be useful if you want to unprotect every URL except a few
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-- particular ones.
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--
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function is_protected()
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if not conf["protected_urls"] then
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conf["protected_urls"] = {}
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end
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if not conf["protected_regex"] then
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conf["protected_regex"] = {}
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end
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for _, url in ipairs(conf["protected_urls"]) do
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if hlp.string.starts(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), url)
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or hlp.string.starts(ngx.var.uri..hlp.uri_args_string(), url) then
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return true
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end
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end
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for _, regex in ipairs(conf["protected_regex"]) do
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if string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
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or string.match(ngx.var.uri..hlp.uri_args_string(), regex) then
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return true
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end
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end
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return false
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end
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--
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-- 5. Skipped URLs
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--
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-- If the URL matches one of the `skipped_urls` in the configuration file,
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-- it means that the URL should not be protected by the SSO and no header
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-- has to be sent, even if the user is already authenticated.
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--
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if conf["skipped_urls"] then
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for _, url in ipairs(conf["skipped_urls"]) do
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if (hlp.string.starts(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), url)
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or hlp.string.starts(ngx.var.uri..hlp.uri_args_string(), url))
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and not is_protected() then
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return hlp.pass()
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end
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end
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end
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if conf["skipped_regex"] then
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for _, regex in ipairs(conf["skipped_regex"]) do
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if (string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
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or string.match(ngx.var.uri..hlp.uri_args_string(), regex))
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and not is_protected() then
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return hlp.pass()
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end
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end
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end
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--
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-- 6. Specific files (used in YunoHost)
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--
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-- We want to serve specific portal assets right at the root of the domain.
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--
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-- For example: `https://mydomain.org/ynhpanel.js` will serve the
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-- `/yunohost/sso/assets/js/ynhpanel.js` file.
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--
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if hlp.is_logged_in() then
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if string.match(ngx.var.uri, "^/ynhpanel.js$") then
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hlp.serve("/yunohost/sso/assets/js/ynhpanel.js")
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end
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if string.match(ngx.var.uri, "^/ynhpanel.css$") then
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hlp.serve("/yunohost/sso/assets/css/ynhpanel.css")
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end
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if string.match(ngx.var.uri, "^/ynhpanel.json$") then
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hlp.serve("/yunohost/sso/assets/js/ynhpanel.json")
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end
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-- If user has no access to this URL, redirect him to the portal
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if not hlp.has_access() then
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return hlp.redirect(conf.portal_url)
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end
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-- If the user is authenticated and has access to the URL, set the headers
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-- and let it be
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hlp.set_headers()
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return hlp.pass()
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end
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--
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-- 7. Unprotected URLs
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--
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-- If the URL matches one of the `unprotected_urls` in the configuration file,
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-- it means that the URL should not be protected by the SSO *but* headers have
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-- to be sent if the user is already authenticated.
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--
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-- It means that you can let anyone access to an app, but if a user has already
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-- been authenticated on the portal, he can have his authentication headers
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-- passed to the app.
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--
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if conf["unprotected_urls"] then
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for _, url in ipairs(conf["unprotected_urls"]) do
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if (hlp.string.starts(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), url)
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or hlp.string.starts(ngx.var.uri..hlp.uri_args_string(), url))
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and not is_protected() then
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if hlp.is_logged_in() then
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hlp.set_headers()
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end
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return hlp.pass()
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end
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end
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end
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if conf["unprotected_regex"] then
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for _, regex in ipairs(conf["unprotected_regex"]) do
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if (string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
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or string.match(ngx.var.uri..hlp.uri_args_string(), regex))
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and not is_protected() then
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if hlp.is_logged_in() then
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hlp.set_headers()
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end
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return hlp.pass()
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end
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end
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end
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--
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-- 8. Basic HTTP Authentication
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--
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-- If the `Authorization` header is set before reaching the SSO, we want to
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-- match user and password against the user database.
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--
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-- It allows you to bypass the cookie-based procedure with a per-request
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-- authentication. Very usefull when you are trying to reach a specific URL
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-- via cURL for example.
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--
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local auth_header = ngx.req.get_headers()["Authorization"]
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if auth_header then
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_, _, b64_cred = string.find(auth_header, "^Basic%s+(.+)$")
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_, _, user, password = string.find(ngx.decode_base64(b64_cred), "^(.+):(.+)$")
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user = hlp.authenticate(user, password)
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if user then
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hlp.set_headers(user)
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-- If user has no access to this URL, redirect him to the portal
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if not hlp.has_access(user) then
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return hlp.redirect(conf.portal_url)
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end
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return hlp.pass()
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end
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end
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--
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-- 9. Redirect to login
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--
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-- If no previous rule has matched, just redirect to the portal login.
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-- The default is to protect every URL by default.
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--
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hlp.flash("info", hlp.t("please_login"))
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local back_url = ngx.var.scheme .. "://" .. ngx.var.host .. ngx.var.uri .. hlp.uri_args_string()
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return hlp.redirect(conf.portal_url.."?r="..ngx.encode_base64(back_url))
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