diff options
Diffstat (limited to '')
| -rw-r--r-- | filters/simple-authentication.lua | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua index 77d1fd0..23d3457 100644 --- a/filters/simple-authentication.lua +++ b/filters/simple-authentication.lua @@ -1,15 +1,15 @@ -- 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> -- luaposix -- <https://github.com/luaposix/luaposix> -- local sysstat = require("posix.sys.stat") local unistd = require("posix.unistd") -local crypto = require("crypto") - +local rand = require("openssl.rand") +local hmac = require("openssl.hmac") -- -- @@ -180,6 +180,13 @@ function get_cookie(cookies, name) return url_decode(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 -- -- @@ -197,12 +204,12 @@ 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) @@ -227,7 +234,7 @@ 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 @@ -246,19 +253,19 @@ 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 @@ -279,11 +286,11 @@ 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 |