prosody
82bca7191f13
util/paseto.lua

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util/paseto.lua @ 12714:82bca7191f13

util.crypto: Use stack space buffers Removes assumption that LUAL_BUFFERSIZE is known at pre-processing time, which it is not in Lua 5.3 and 5.4, where it is a computed macro based on sizeof. Allocation of stack space is safer and faster, no need to worry about luaL_prepbuffer failing to allocate memory and skipping free()
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 17:01:55 +0200
parent 12713:52eead170bb8
child 12716:0b68b021ce46
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local crypto = require "util.crypto";
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2 local json = require "util.json";
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3 local base64_encode = require "util.encodings".base64.encode;
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4 local base64_decode = require "util.encodings".base64.decode;
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5 local secure_equals = require "util.hashes".equals;
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6 local bit = require "util.bitcompat";
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7 local s_pack = require "util.struct".pack;
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8
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9 local s_gsub = string.gsub;
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10
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11 local v4_public = {};
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12
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13 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
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14 local function b64url(data)
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15 return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
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16 end
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17 local function unb64url(data)
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18 return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
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19 end
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20
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21 local function le64(n)
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22 return s_pack("<I8", bit.band(n, 0x7F));
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23 end
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24
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25 local function pae(parts)
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26 local o = { le64(#parts) };
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27 for _, part in ipairs(parts) do
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28 table.insert(o, le64(#part)..part);
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29 end
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30 return table.concat(o);
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31 end
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32
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33 function v4_public.sign(m, sk, f, i)
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34 if type(m) ~= "table" then
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35 return nil, "PASETO payloads must be a table";
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36 end
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37 m = json.encode(m);
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38 local h = "v4.public.";
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39 local m2 = pae({ h, m, f or "", i or "" });
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40 local sig = crypto.ed25519_sign(sk, m2);
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41 if not f or f == "" then
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42 return h..b64url(m..sig);
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43 else
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44 return h..b64url(m..sig).."."..b64url(f);
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45 end
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46 end
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47
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48 function v4_public.verify(tok, pk, expected_f, i)
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49 local h, sm, f = tok:match("^(v4%.public%.)([^%.]+)%.?(.*)$");
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50 if not h then
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51 return nil, "invalid-token-format";
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52 end
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53 f = f and unb64url(f) or nil;
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54 if expected_f then
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55 if not f or not secure_equals(expected_f, f) then
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56 return nil, "invalid-footer";
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57 end
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58 end
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59 local raw_sm = unb64url(sm);
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60 if not raw_sm or #raw_sm <= 64 then
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61 return nil, "invalid-token-format";
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62 end
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63 local s, m = raw_sm:sub(-64), raw_sm:sub(1, -65);
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64 local m2 = pae({ h, m, f or "", i or "" });
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65 local ok = crypto.ed25519_verify(pk, m2, s);
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66 if not ok then
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67 return nil, "invalid-token";
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68 end
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69 local payload, err = json.decode(m);
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70 if err ~= nil or type(payload) ~= "table" then
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71 return nil, "json-decode-error";
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72 end
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73 return payload;
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74 end
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75
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76 v4_public.import_private_key = crypto.import_private_pem;
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77 v4_public.import_public_key = crypto.import_public_pem;
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78 function v4_public.new_keypair()
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79 return crypto.generate_ed25519_keypair();
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80 end
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81
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82 function v4_public.init(private_key_pem, public_key_pem, options)
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83 local sign, verify = v4_public.sign, v4_public.verify;
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84 local public_key = public_key_pem and v4_public.import_public_key(public_key_pem);
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85 local private_key = private_key_pem and v4_public.import_private_key(private_key_pem);
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86 local default_footer = options and options.default_footer;
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87 local default_assertion = options and options.default_implicit_assertion;
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88 return private_key and function (token, token_footer, token_assertion)
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89 return sign(token, private_key, token_footer or default_footer, token_assertion or default_assertion);
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90 end, public_key and function (token, expected_footer, token_assertion)
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91 return verify(token, public_key, expected_footer or default_footer, token_assertion or default_assertion);
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92 end;
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93 end
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94
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95 function v4_public.new_signer(private_key_pem, options)
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96 return (v4_public.init(private_key_pem, nil, options));
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97 end
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98
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99 function v4_public.new_verifier(public_key_pem, options)
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100 return (select(2, v4_public.init(public_key_pem, options)));
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101 end
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102
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103 return {
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104 pae = pae;
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105 v4_public = v4_public;
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106 };