-- 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 0end -- 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 endend -- 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 0end ------ 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_postactions["authenticate-cookie"] = authenticate_cookieactions["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 strend 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 strend function parse_qs(qs) local tab = {} for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do tab[url_decode(key)] = url_decode(val) end return tabend 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 authstrend 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
-- 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