filters: Add sample gentoo script
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Jason A. Donenfeld
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filters/gentoo-ldap-authentication.lua
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320
filters/gentoo-ldap-authentication.lua
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-- This script may be used with the auth-filter. Be sure to configure it as you wish.
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--
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-- Requirements:
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-- luacrypto >= 0.3
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-- <http://mkottman.github.io/luacrypto/>
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-- lualdap >= 1.2
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-- <http://git.zx2c4.com/lualdap/about/>
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--
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--
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--
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-- Configure these variables for your settings.
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--
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--
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-- A list of password protected repositories, with which gentooAccess
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-- group is allowed to access each one.
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local protected_repos = {
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glouglou = "infra",
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portage = "dev"
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}
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-- All cookies will be authenticated based on this secret. Make it something
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-- totally random and impossible to guess. It should be large.
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local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
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--
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--
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-- Authentication functions follow below. Swap these out if you want different authentication semantics.
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--
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--
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-- Sets HTTP cookie headers based on post and sets up redirection.
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function authenticate_post()
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local redirect = validate_value("redirect", post["redirect"])
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if redirect == nil then
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not_found()
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return 0
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end
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redirect_to(redirect)
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local groups = gentoo_ldap_user_groups(post["username"], post["password"])
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if groups == nil then
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set_cookie("cgitauth", "")
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else
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-- One week expiration time
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set_cookie("cgitauth", secure_value("gentoogroups", table.concat(groups, ","), os.time() + 604800))
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end
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html("\n")
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return 0
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end
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-- Returns 1 if the cookie is valid and 0 if it is not.
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function authenticate_cookie()
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local required_group = protected_repos[cgit["repo"]]
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if required_group == nil then
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-- We return as valid if the repo is not protected.
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return 1
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end
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local user_groups = validate_value("gentoogroups", get_cookie(http["cookie"], "cgitauth"))
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if user_groups == nil or user_groups == "" then
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return 0
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end
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for group in string.gmatch(user_groups, "[^,]+") do
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if group == required_group then
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return 1
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end
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end
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return 0
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end
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-- Prints the html for the login form.
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function body()
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html("<h2>Gentoo LDAP Authentication Required</h2>")
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html("<form method='post' action='")
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html_attr(cgit["login"])
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html("'>")
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html("<input type='hidden' name='redirect' value='")
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html_attr(secure_value("redirect", cgit["url"], 0))
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html("' />")
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html("<table>")
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html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
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html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
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html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
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html("</table></form>")
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return 0
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end
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--
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--
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-- Gentoo LDAP support.
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--
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--
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local lualdap = require("lualdap")
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function gentoo_ldap_user_groups(username, password)
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-- Ensure the user is alphanumeric
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if username:match("%W") then
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return nil
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end
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local who = "uid=" .. username .. ",ou=devs,dc=gentoo,dc=org"
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local ldap, err = lualdap.open_simple {
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uri = "ldap://ldap1.gentoo.org",
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who = who,
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password = password,
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starttls = true,
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certfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.crt",
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keyfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.key",
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cacertfile = "/var/www/uwsgi/cgit/gentoo-ldap/ca.pem"
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}
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if ldap == nil then
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return nil
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end
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local group_suffix = ".group"
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local group_suffix_len = group_suffix:len()
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local groups = {}
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for dn, attribs in ldap:search { base = who, scope = "subtree" } do
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local access = attribs["gentooAccess"]
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if dn == who and access ~= nil then
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for i, v in ipairs(access) do
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local vlen = v:len()
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if vlen > group_suffix_len and v:sub(-group_suffix_len) == group_suffix then
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table.insert(groups, v:sub(1, vlen - group_suffix_len))
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end
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end
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end
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end
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ldap:close()
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return groups
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end
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--
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--
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-- Wrapper around filter API, exposing the http table, the cgit table, and the post table to the above functions.
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--
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--
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local actions = {}
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actions["authenticate-post"] = authenticate_post
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actions["authenticate-cookie"] = authenticate_cookie
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actions["body"] = body
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function filter_open(...)
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action = actions[select(1, ...)]
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http = {}
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http["cookie"] = select(2, ...)
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http["method"] = select(3, ...)
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http["query"] = select(4, ...)
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http["referer"] = select(5, ...)
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http["path"] = select(6, ...)
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http["host"] = select(7, ...)
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http["https"] = select(8, ...)
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cgit = {}
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cgit["repo"] = select(9, ...)
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cgit["page"] = select(10, ...)
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cgit["url"] = select(11, ...)
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cgit["login"] = select(12, ...)
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end
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function filter_close()
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return action()
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end
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function filter_write(str)
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post = parse_qs(str)
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end
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--
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--
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-- Utility functions based on keplerproject/wsapi.
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--
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--
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function url_decode(str)
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if not str then
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return ""
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end
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str = string.gsub(str, "+", " ")
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str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
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str = string.gsub(str, "\r\n", "\n")
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return str
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end
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function url_encode(str)
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if not str then
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return ""
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end
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str = string.gsub(str, "\n", "\r\n")
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str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
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str = string.gsub(str, " ", "+")
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return str
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end
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function parse_qs(qs)
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local tab = {}
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for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
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tab[url_decode(key)] = url_decode(val)
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end
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return tab
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end
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function get_cookie(cookies, name)
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cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
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return string.match(cookies, ";" .. name .. "=(.-);")
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end
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--
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--
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-- Cookie construction and validation helpers.
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--
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--
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local crypto = require("crypto")
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-- Returns value of cookie if cookie is valid. Otherwise returns nil.
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function validate_value(expected_field, cookie)
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local i = 0
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local value = ""
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local field = ""
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local expiration = 0
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local salt = ""
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local hmac = ""
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if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
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return nil
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end
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for component in string.gmatch(cookie, "[^|]+") do
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if i == 0 then
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field = component
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elseif i == 1 then
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value = component
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elseif i == 2 then
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expiration = tonumber(component)
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if expiration == nil then
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expiration = -1
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end
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elseif i == 3 then
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salt = component
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elseif i == 4 then
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hmac = component
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else
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break
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end
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i = i + 1
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end
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if hmac == nil or hmac:len() == 0 then
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return nil
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end
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-- Lua hashes strings, so these comparisons are time invariant.
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if hmac ~= crypto.hmac.digest("sha1", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
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return nil
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end
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if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then
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return nil
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end
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if url_decode(field) ~= expected_field then
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return nil
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end
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return url_decode(value)
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end
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function secure_value(field, value, expiration)
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if value == nil or value:len() <= 0 then
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return ""
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end
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local authstr = ""
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local salt = crypto.hex(crypto.rand.bytes(16))
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value = url_encode(value)
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field = url_encode(field)
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authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
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authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret)
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return authstr
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end
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function set_cookie(cookie, value)
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html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly")
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if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
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html("; secure")
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end
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html("\n")
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end
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function redirect_to(url)
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html("Status: 302 Redirect\n")
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html("Cache-Control: no-cache, no-store\n")
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html("Location: " .. url .. "\n")
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end
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function not_found()
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html("Status: 404 Not Found\n")
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html("Cache-Control: no-cache, no-store\n\n")
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end
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