prosody
26a004c96ef8
plugins/mod_tokenauth.lua

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plugins/mod_tokenauth.lua @ 12694:26a004c96ef8

util.paseto: Implementation of PASETO v4.public tokens PASETO provides an alternative to JWT with the promise of fewer implementation pitfalls. The v4.public algorithm allows asymmetric cryptographically-verified token issuance and validation. In summary, such tokens can be issued by one party and securely verified by any other party independently using the public key of the issuer. This has a number of potential applications in a decentralized network and ecosystem such as XMPP. For example, such tokens could be combined with XEP-0317 to allow hats to be verified even in the context of a third-party MUC service.
author Matthew Wild <mwild1@gmail.com>
date Fri, 24 Jun 2022 17:03:28 +0100
parent 12662:07424992d7fc
child 12742:126aefd2c4c6
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1 local id = require "util.id";
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2 local jid = require "util.jid";
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3 local base64 = require "util.encodings".base64;
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4 local usermanager = require "core.usermanager";
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5 local generate_identifier = require "util.id".short;
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6
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7 local token_store = module:open_store("auth_tokens", "map");
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8
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9 local function select_role(username, host, role)
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10 if role then
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11 return prosody.hosts[host].authz.get_role_by_name(role);
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12 end
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13 return usermanager.get_user_role(username, host);
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14 end
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15
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16 function create_jid_token(actor_jid, token_jid, token_role, token_ttl)
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17 token_jid = jid.prep(token_jid);
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18 if not actor_jid or token_jid ~= actor_jid and not jid.compare(token_jid, actor_jid) then
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19 return nil, "not-authorized";
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20 end
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21
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22 local token_username, token_host, token_resource = jid.split(token_jid);
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23
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24 if token_host ~= module.host then
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25 return nil, "invalid-host";
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26 end
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27
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28 local token_info = {
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29 owner = actor_jid;
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30 created = os.time();
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31 expires = token_ttl and (os.time() + token_ttl) or nil;
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32 jid = token_jid;
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33
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34 resource = token_resource;
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35 role = token_role;
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36 };
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37
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38 local token_id = id.long();
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39 local token = base64.encode("1;"..jid.join(token_username, token_host)..";"..token_id);
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40 token_store:set(token_username, token_id, token_info);
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41
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42 return token, token_info;
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43 end
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44
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45 local function parse_token(encoded_token)
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46 local token = base64.decode(encoded_token);
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47 if not token then return nil; end
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48 local token_jid, token_id = token:match("^1;([^;]+);(.+)$");
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49 if not token_jid then return nil; end
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50 local token_user, token_host = jid.split(token_jid);
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51 return token_id, token_user, token_host;
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52 end
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53
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54 local function _get_parsed_token_info(token_id, token_user, token_host)
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55 if token_host ~= module.host then
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56 return nil, "invalid-host";
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57 end
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58
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59 local token_info, err = token_store:get(token_user, token_id);
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60 if not token_info then
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61 if err then
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62 return nil, "internal-error";
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63 end
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64 return nil, "not-authorized";
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65 end
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66
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67 if token_info.expires and token_info.expires < os.time() then
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68 return nil, "not-authorized";
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69 end
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70
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71 return token_info
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72 end
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73
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74 function get_token_info(token)
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75 local token_id, token_user, token_host = parse_token(token);
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76 if not token_id then
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77 return nil, "invalid-token-format";
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78 end
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79 return _get_parsed_token_info(token_id, token_user, token_host);
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80 end
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81
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82 function get_token_session(token, resource)
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83 local token_id, token_user, token_host = parse_token(token);
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84 if not token_id then
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85 return nil, "invalid-token-format";
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86 end
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87
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88 local token_info, err = _get_parsed_token_info(token_id, token_user, token_host);
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89 if not token_info then return nil, err; end
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90
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91 return {
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92 username = token_user;
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93 host = token_host;
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94 resource = token_info.resource or resource or generate_identifier();
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95
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96 role = select_role(token_user, token_host, token_info.role);
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97 };
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98 end
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99
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100
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101 function revoke_token(token)
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102 local token_id, token_user, token_host = parse_token(token);
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103 if not token_id then
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104 return nil, "invalid-token-format";
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105 end
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106 if token_host ~= module.host then
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107 return nil, "invalid-host";
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108 end
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109 return token_store:set(token_user, token_id, nil);
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110 end