prosody-modules
3114b403362d
mod_auth_token/token_auth_utils.lib.lua

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mod_auth_token/token_auth_utils.lib.lua @ 3324:3114b403362d

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author Kim Alvefur <zash@zash.se>
date Thu, 20 Sep 2018 15:21:48 +0200
parent 2956:d0ca211e1b0e
child 3472:ac1f63cdb6d6
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1 local base64 = require "util.encodings".base64;
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2 local digest = require "openssl.digest";
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3 local hmac = require "openssl.hmac";
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4 local luatz = require "luatz";
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5 local otp = require "otp";
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6
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7 local DIGEST_TYPE = "SHA256";
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8 local OTP_DEVIATION = 1;
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9 local OTP_DIGITS = 8;
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10 local OTP_INTERVAL = 30;
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11
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12 local nonce_cache = {};
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13
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14 function check_nonce(jid, otp, nonce)
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15 -- We cache all nonces used per OTP, to ensure that a token cannot be used
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16 -- more than once.
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17 --
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18 -- We assume that the OTP is valid in the current time window. This is the
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19 -- case because we only call check_nonce *after* the OTP has been verified.
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20 --
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21 -- We only store one OTP per JID, so if a new OTP comes in, we wipe the
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22 -- previous OTP and its cached nonces.
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23 if nonce_cache[jid] == nil or nonce_cache[jid][otp] == nil then
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24 nonce_cache[jid] = {}
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25 nonce_cache[jid][otp] = {}
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26 nonce_cache[jid][otp][nonce] = true
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27 return true;
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28 end
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29 if nonce_cache[jid][otp][nonce] == true then
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30 return false;
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31 else
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32 nonce_cache[jid][otp][nonce] = true;
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33 return true;
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34 end
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35 end
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36
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37
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38 function verify_token(username, password, realm, otp_seed, token_secret, log)
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39 local totp = otp.new_totp_from_key(otp_seed, OTP_DIGITS, OTP_INTERVAL)
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40 local token = string.match(password, "(%d+) ")
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41 local otp = token:sub(1,8)
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42 local nonce = token:sub(9)
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43 local signature = base64.decode(string.match(password, " (.+)"))
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44 local jid = username.."@"..realm
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45
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46 if totp:verify(otp, OTP_DEVIATION, luatz.gmtime(luatz.time())) then
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47 -- log("debug", "**** THE OTP WAS VERIFIED ****** ");
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48 local hmac_ctx = hmac.new(token_secret, DIGEST_TYPE)
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49 if signature == hmac_ctx:final(otp..nonce..jid) then
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50 -- log("debug", "**** THE KEY WAS VERIFIED ****** ");
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51 if check_nonce(jid, otp, nonce) then
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52 -- log("debug", "**** THE NONCE WAS VERIFIED ****** ");
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53 return true;
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54 end
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55 end
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56 end
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57 -- log("debug", "**** VERIFICATION FAILED ****** ");
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58 return false;
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59 end
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60
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61 return {
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62 OTP_DEVIATION = OTP_DIGITS,
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63 OTP_DIGITS = OTP_DIGITS,
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64 OTP_INTERVAL = OTP_INTERVAL,
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65 DIGEST_TYPE = DIGEST_TYPE,
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66 verify_token = verify_token;
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67 }