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Code Issues Releases Wiki Activity

filters: migrate from luacrypto to luaossl

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luaossl has no upstream anymore and doesn't support OpenSSL 1.1,
whereas luaossl is quite active.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2019-01-03 02:11:14 +01:00
parent e23f63461f
commit 7d87cd3a21
5 changed files with 83 additions and 44 deletions
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31
filters/gentoo-ldap-authentication.lua
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@@ -1,8 +1,8 @@
-- 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/>
-- luaossl
-- <http://25thandclement.com/~william/projects/luaossl.html>
-- lualdap >= 1.2
-- <https://git.zx2c4.com/lualdap/about/>
-- luaposix
@@ -10,9 +10,9 @@
--
local sysstat = require("posix.sys.stat")
local unistd = require("posix.unistd")
local crypto = require("crypto")
local lualdap = require("lualdap")
local rand = require("openssl.rand")
local hmac = require("openssl.hmac")
--
--
@@ -226,6 +226,13 @@ function get_cookie(cookies, name)
return string.match(cookies, ";" .. name .. "=(.-);")
end
function tohex(b)
local x = ""
for i = 1, #b do
x = x .. string.format("%.2x", string.byte(b, i))
end
return x
end
--
--
@@ -243,12 +250,12 @@ function get_secret()
local secret_file = io.open(secret_filename, "r")
if secret_file == nil then
local old_umask = sysstat.umask(63)
local temporary_filename = secret_filename .. ".tmp." .. crypto.hex(crypto.rand.bytes(16))
local temporary_filename = secret_filename .. ".tmp." .. tohex(rand.bytes(16))
local temporary_file = io.open(temporary_filename, "w")
if temporary_file == nil then
os.exit(177)
end
temporary_file:write(crypto.hex(crypto.rand.bytes(32)))
temporary_file:write(tohex(rand.bytes(32)))
temporary_file:close()
unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
unistd.unlink(temporary_filename)
@@ -273,7 +280,7 @@ function validate_value(expected_field, cookie)
local field = ""
local expiration = 0
local salt = ""
local hmac = ""
local chmac = ""
if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
return nil
@@ -292,19 +299,19 @@ function validate_value(expected_field, cookie)
elseif i == 3 then
salt = component
elseif i == 4 then
hmac = component
chmac = component
else
break
end
i = i + 1
end
if hmac == nil or hmac:len() == 0 then
if chmac == nil or chmac:len() == 0 then
return nil
end
-- Lua hashes strings, so these comparisons are time invariant.
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, get_secret()) then
if chmac ~= tohex(hmac.new(get_secret(), "sha256"):final(field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt)) then
return nil
end
@@ -325,11 +332,11 @@ function secure_value(field, value, expiration)
end
local authstr = ""
local salt = crypto.hex(crypto.rand.bytes(16))
local salt = tohex(rand.bytes(16))
value = url_encode(value)
field = url_encode(field)
authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
authstr = authstr .. "|" .. crypto.hmac.digest("sha256", authstr, get_secret())
authstr = authstr .. "|" .. tohex(hmac.new(get_secret(), "sha256"):final(authstr))
return authstr
end