filters: Add sample gentoo script
This commit is contained in:
Jason A. Donenfeld
父節點
f3ab1f178f
當前提交
7511f4b4df
320
filters/gentoo-ldap-authentication.lua
Normal file
320
filters/gentoo-ldap-authentication.lua
Normal file
@ -0,0 +1,320 @@
|
||||
-- This script may be used with the auth-filter. Be sure to configure it as you wish.
|
||||
--
|
||||
-- Requirements:
|
||||
-- luacrypto >= 0.3
|
||||
-- <http://mkottman.github.io/luacrypto/>
|
||||
-- lualdap >= 1.2
|
||||
-- <http://git.zx2c4.com/lualdap/about/>
|
||||
--
|
||||
|
||||
|
||||
--
|
||||
--
|
||||
-- Configure these variables for your settings.
|
||||
--
|
||||
--
|
||||
|
||||
-- A list of password protected repositories, with which gentooAccess
|
||||
-- group is allowed to access each one.
|
||||
local protected_repos = {
|
||||
glouglou = "infra",
|
||||
portage = "dev"
|
||||
}
|
||||
|
||||
|
||||
-- All cookies will be authenticated based on this secret. Make it something
|
||||
-- totally random and impossible to guess. It should be large.
|
||||
local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
|
||||
|
||||
|
||||
|
||||
--
|
||||
--
|
||||
-- Authentication functions follow below. Swap these out if you want different authentication semantics.
|
||||
--
|
||||
--
|
||||
|
||||
-- Sets HTTP cookie headers based on post and sets up redirection.
|
||||
function authenticate_post()
|
||||
local redirect = validate_value("redirect", post["redirect"])
|
||||
|
||||
if redirect == nil then
|
||||
not_found()
|
||||
return 0
|
||||
end
|
||||
|
||||
redirect_to(redirect)
|
||||
|
||||
local groups = gentoo_ldap_user_groups(post["username"], post["password"])
|
||||
if groups == nil then
|
||||
set_cookie("cgitauth", "")
|
||||
else
|
||||
-- One week expiration time
|
||||
set_cookie("cgitauth", secure_value("gentoogroups", table.concat(groups, ","), os.time() + 604800))
|
||||
end
|
||||
|
||||
html("\n")
|
||||
return 0
|
||||
end
|
||||
|
||||
|
||||
-- Returns 1 if the cookie is valid and 0 if it is not.
|
||||
function authenticate_cookie()
|
||||
local required_group = protected_repos[cgit["repo"]]
|
||||
if required_group == nil then
|
||||
-- We return as valid if the repo is not protected.
|
||||
return 1
|
||||
end
|
||||
|
||||
local user_groups = validate_value("gentoogroups", get_cookie(http["cookie"], "cgitauth"))
|
||||
if user_groups == nil or user_groups == "" then
|
||||
return 0
|
||||
end
|
||||
for group in string.gmatch(user_groups, "[^,]+") do
|
||||
if group == required_group then
|
||||
return 1
|
||||
end
|
||||
end
|
||||
return 0
|
||||
end
|
||||
|
||||
-- Prints the html for the login form.
|
||||
function body()
|
||||
html("<h2>Gentoo LDAP Authentication Required</h2>")
|
||||
html("<form method='post' action='")
|
||||
html_attr(cgit["login"])
|
||||
html("'>")
|
||||
html("<input type='hidden' name='redirect' value='")
|
||||
html_attr(secure_value("redirect", cgit["url"], 0))
|
||||
html("' />")
|
||||
html("<table>")
|
||||
html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
|
||||
html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
|
||||
html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
|
||||
html("</table></form>")
|
||||
|
||||
return 0
|
||||
end
|
||||
|
||||
--
|
||||
--
|
||||
-- Gentoo LDAP support.
|
||||
--
|
||||
--
|
||||
|
||||
local lualdap = require("lualdap")
|
||||
|
||||
function gentoo_ldap_user_groups(username, password)
|
||||
-- Ensure the user is alphanumeric
|
||||
if username:match("%W") then
|
||||
return nil
|
||||
end
|
||||
|
||||
local who = "uid=" .. username .. ",ou=devs,dc=gentoo,dc=org"
|
||||
|
||||
local ldap, err = lualdap.open_simple {
|
||||
uri = "ldap://ldap1.gentoo.org",
|
||||
who = who,
|
||||
password = password,
|
||||
starttls = true,
|
||||
certfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.crt",
|
||||
keyfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.key",
|
||||
cacertfile = "/var/www/uwsgi/cgit/gentoo-ldap/ca.pem"
|
||||
}
|
||||
if ldap == nil then
|
||||
return nil
|
||||
end
|
||||
|
||||
local group_suffix = ".group"
|
||||
local group_suffix_len = group_suffix:len()
|
||||
local groups = {}
|
||||
for dn, attribs in ldap:search { base = who, scope = "subtree" } do
|
||||
local access = attribs["gentooAccess"]
|
||||
if dn == who and access ~= nil then
|
||||
for i, v in ipairs(access) do
|
||||
local vlen = v:len()
|
||||
if vlen > group_suffix_len and v:sub(-group_suffix_len) == group_suffix then
|
||||
table.insert(groups, v:sub(1, vlen - group_suffix_len))
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
ldap:close()
|
||||
|
||||
return groups
|
||||
end
|
||||
|
||||
--
|
||||
--
|
||||
-- Wrapper around filter API, exposing the http table, the cgit table, and the post table to the above functions.
|
||||
--
|
||||
--
|
||||
|
||||
local actions = {}
|
||||
actions["authenticate-post"] = authenticate_post
|
||||
actions["authenticate-cookie"] = authenticate_cookie
|
||||
actions["body"] = body
|
||||
|
||||
function filter_open(...)
|
||||
action = actions[select(1, ...)]
|
||||
|
||||
http = {}
|
||||
http["cookie"] = select(2, ...)
|
||||
http["method"] = select(3, ...)
|
||||
http["query"] = select(4, ...)
|
||||
http["referer"] = select(5, ...)
|
||||
http["path"] = select(6, ...)
|
||||
http["host"] = select(7, ...)
|
||||
http["https"] = select(8, ...)
|
||||
|
||||
cgit = {}
|
||||
cgit["repo"] = select(9, ...)
|
||||
cgit["page"] = select(10, ...)
|
||||
cgit["url"] = select(11, ...)
|
||||
cgit["login"] = select(12, ...)
|
||||
|
||||
end
|
||||
|
||||
function filter_close()
|
||||
return action()
|
||||
end
|
||||
|
||||
function filter_write(str)
|
||||
post = parse_qs(str)
|
||||
end
|
||||
|
||||
|
||||
--
|
||||
--
|
||||
-- Utility functions based on keplerproject/wsapi.
|
||||
--
|
||||
--
|
||||
|
||||
function url_decode(str)
|
||||
if not str then
|
||||
return ""
|
||||
end
|
||||
str = string.gsub(str, "+", " ")
|
||||
str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
|
||||
str = string.gsub(str, "\r\n", "\n")
|
||||
return str
|
||||
end
|
||||
|
||||
function url_encode(str)
|
||||
if not str then
|
||||
return ""
|
||||
end
|
||||
str = string.gsub(str, "\n", "\r\n")
|
||||
str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
|
||||
str = string.gsub(str, " ", "+")
|
||||
return str
|
||||
end
|
||||
|
||||
function parse_qs(qs)
|
||||
local tab = {}
|
||||
for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
|
||||
tab[url_decode(key)] = url_decode(val)
|
||||
end
|
||||
return tab
|
||||
end
|
||||
|
||||
function get_cookie(cookies, name)
|
||||
cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
|
||||
return string.match(cookies, ";" .. name .. "=(.-);")
|
||||
end
|
||||
|
||||
|
||||
--
|
||||
--
|
||||
-- Cookie construction and validation helpers.
|
||||
--
|
||||
--
|
||||
|
||||
local crypto = require("crypto")
|
||||
|
||||
-- Returns value of cookie if cookie is valid. Otherwise returns nil.
|
||||
function validate_value(expected_field, cookie)
|
||||
local i = 0
|
||||
local value = ""
|
||||
local field = ""
|
||||
local expiration = 0
|
||||
local salt = ""
|
||||
local hmac = ""
|
||||
|
||||
if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
|
||||
return nil
|
||||
end
|
||||
|
||||
for component in string.gmatch(cookie, "[^|]+") do
|
||||
if i == 0 then
|
||||
field = component
|
||||
elseif i == 1 then
|
||||
value = component
|
||||
elseif i == 2 then
|
||||
expiration = tonumber(component)
|
||||
if expiration == nil then
|
||||
expiration = -1
|
||||
end
|
||||
elseif i == 3 then
|
||||
salt = component
|
||||
elseif i == 4 then
|
||||
hmac = component
|
||||
else
|
||||
break
|
||||
end
|
||||
i = i + 1
|
||||
end
|
||||
|
||||
if hmac == nil or hmac:len() == 0 then
|
||||
return nil
|
||||
end
|
||||
|
||||
-- Lua hashes strings, so these comparisons are time invariant.
|
||||
if hmac ~= crypto.hmac.digest("sha1", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
|
||||
return nil
|
||||
end
|
||||
|
||||
if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then
|
||||
return nil
|
||||
end
|
||||
|
||||
if url_decode(field) ~= expected_field then
|
||||
return nil
|
||||
end
|
||||
|
||||
return url_decode(value)
|
||||
end
|
||||
|
||||
function secure_value(field, value, expiration)
|
||||
if value == nil or value:len() <= 0 then
|
||||
return ""
|
||||
end
|
||||
|
||||
local authstr = ""
|
||||
local salt = crypto.hex(crypto.rand.bytes(16))
|
||||
value = url_encode(value)
|
||||
field = url_encode(field)
|
||||
authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
|
||||
authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret)
|
||||
return authstr
|
||||
end
|
||||
|
||||
function set_cookie(cookie, value)
|
||||
html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly")
|
||||
if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
|
||||
html("; secure")
|
||||
end
|
||||
html("\n")
|
||||
end
|
||||
|
||||
function redirect_to(url)
|
||||
html("Status: 302 Redirect\n")
|
||||
html("Cache-Control: no-cache, no-store\n")
|
||||
html("Location: " .. url .. "\n")
|
||||
end
|
||||
|
||||
function not_found()
|
||||
html("Status: 404 Not Found\n")
|
||||
html("Cache-Control: no-cache, no-store\n\n")
|
||||
end
|
||||
Loading…
Reference in New Issue
Block a user