mirror of
https://git.zx2c4.com/cgit
synced 2024-11-29 20:06:21 +00:00
281 lines
6.8 KiB
Lua
281 lines
6.8 KiB
Lua
-- 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/>
|
|
--
|
|
|
|
|
|
--
|
|
--
|
|
-- Configure these variables for your settings.
|
|
--
|
|
--
|
|
|
|
-- A list of password protected repositories along with the users who can access them.
|
|
local protected_repos = {
|
|
glouglou = { laurent = true, jason = true },
|
|
qt = { jason = true, bob = true }
|
|
}
|
|
|
|
-- Please note that, in production, you'll want to replace this simple lookup
|
|
-- table with either a table of salted and hashed passwords (using something
|
|
-- smart like scrypt), or replace this table lookup with an external support,
|
|
-- such as consulting your system's pam / shadow system, or an external
|
|
-- database, or an external validating web service. For testing, or for
|
|
-- extremely low-security usage, you may be able, however, to get away with
|
|
-- compromising on hardcoding the passwords in cleartext, as we have done here.
|
|
local users = {
|
|
jason = "secretpassword",
|
|
laurent = "s3cr3t",
|
|
bob = "ilikelua"
|
|
}
|
|
|
|
-- 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 password = users[post["username"]]
|
|
local redirect = validate_value("redirect", post["redirect"])
|
|
|
|
if redirect == nil then
|
|
not_found()
|
|
return 0
|
|
end
|
|
|
|
redirect_to(redirect)
|
|
|
|
-- Lua hashes strings, so these comparisons are time invariant.
|
|
if password == nil or password ~= post["password"] then
|
|
set_cookie("cgitauth", "")
|
|
else
|
|
-- One week expiration time
|
|
local username = secure_value("username", post["username"], os.time() + 604800)
|
|
set_cookie("cgitauth", username)
|
|
end
|
|
|
|
html("\n")
|
|
return 0
|
|
end
|
|
|
|
|
|
-- Returns 1 if the cookie is valid and 0 if it is not.
|
|
function authenticate_cookie()
|
|
accepted_users = protected_repos[cgit["repo"]]
|
|
if accepted_users == nil then
|
|
-- We return as valid if the repo is not protected.
|
|
return 1
|
|
end
|
|
|
|
local username = validate_value("username", get_cookie(http["cookie"], "cgitauth"))
|
|
if username == nil or not accepted_users[username:lower()] then
|
|
return 0
|
|
else
|
|
return 1
|
|
end
|
|
end
|
|
|
|
-- Prints the html for the login form.
|
|
function body()
|
|
html("<h2>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
|
|
|
|
|
|
|
|
--
|
|
--
|
|
-- 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 url_decode(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
|