prosody-modules
74145faceba2
mod_sasl2_fast/mod_sasl2_fast.lua

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mod_sasl2_fast/mod_sasl2_fast.lua @ 5066:74145faceba2

mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
author Matthew Wild <mwild1@gmail.com>
date Fri, 14 Oct 2022 14:44:27 +0100
parent 5062:38a0e3621181
child 5068:20e635eb4cdc
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1 local sasl = require "util.sasl";
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2 local dt = require "util.datetime";
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3 local id = require "util.id";
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4 local st = require "util.stanza";
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5 local now = require "util.time".now;
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6 local hash = require "util.hashes";
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7
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8 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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9
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10 local xmlns_fast = "urn:xmpp:fast:0";
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11 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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12
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13 local token_store = module:open_store("fast_tokens", "map");
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14
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15 local function make_token(username, client_id, mechanism)
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16 local new_token = "secret-token:fast-"..id.long();
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17 local key = hash.sha256(client_id, true).."-new";
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18 local issued_at = now();
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19 token_store:set(username, key, {
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20 mechanism = mechanism;
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21 secret = new_token;
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22 issued_at = issued_at;
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23 expires_at = issued_at + fast_token_ttl;
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24 });
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25 end
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26
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27 local function new_token_tester(username, hmac_f)
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28 return function (mechanism, client_id, token_hash, cb_data)
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29 local tried_current_token = false;
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30 local key = hash.sha256(client_id, true).."-new";
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31 local token;
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32 repeat
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33 token = token_store:get(username, key);
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34 if token and token.mechanism == mechanism then
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35 local expected_hash = hmac_f(token.secret, "Initiator"..cb_data);
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36 if hash.equals(expected_hash, token_hash) then
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37 if token.expires_at < now() then
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38 token_store:set(username, key, nil);
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39 return nil, "credentials-expired";
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40 end
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41 if not tried_current_token then
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42 -- The new token is becoming the current token
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43 token_store:set_keys(username, {
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44 [key] = token_store.remove;
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45 [key:sub(1, -4).."-cur"] = token;
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46 });
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47 end
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48 return true, username, hmac_f(token.secret, "Responder"..cb_data);
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49 end
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50 end
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51 if not tried_current_token then
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52 -- Try again with the current token instead
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53 tried_current_token = true;
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54 key = key:sub(1, -4).."-cur";
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55 else
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56 return nil;
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57 end
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58 until false;
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59 end
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60 end
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61
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62 function get_sasl_handler(session)
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63 local username = session.username;
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64 local token_auth_profile = {
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65 ht_256 = new_token_tester(username, hash.hmac_sha256);
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66 token_test = function (_, client_id, token, mech_name, counter) --luacheck: ignore
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67 return false; -- FIXME
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68 end;
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69 };
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70 return sasl.new(module.host, token_auth_profile);
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71 end
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72
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73 -- Advertise FAST to connecting clients
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74 module:hook("advertise-sasl-features", function (event)
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75 local session = event.origin;
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76 local sasl_handler = get_sasl_handler(session);
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77 if not sasl_handler then return; end
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78 session.fast_sasl_handler = sasl_handler;
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79 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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80 for mech in pairs(sasl_handler:mechanisms()) do
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81 fast:text_tag("mechanism", mech);
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82 end
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83 event.features:add_child(fast);
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84 end);
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85
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86 -- Process any FAST elements in <authenticate/>
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87 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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88 -- Cache action for future processing (after auth success)
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89 local fast_auth = auth:get_child(xmlns_fast, "fast");
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90 if fast_auth then
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91 -- Client says it is using FAST auth, so set our SASL handler
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92 session.log("debug", "Client is authenticating using FAST");
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93 local fast_sasl_handler = session.fast_sasl_handler;
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94 fast_sasl_handler.profile._client_id = session.client_id;
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95 session.sasl_handler = fast_sasl_handler;
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96 end
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97 session.fast_sasl_handler = nil;
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98 local fast_token_request = auth:get_child(xmlns_fast, "request-token");
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99 if fast_token_request then
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100 local mech = fast_token_request.attr.mechanism;
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101 session.log("debug", "Client requested new FAST token for %s", mech);
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102 session.fast_token_request = {
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103 mechanism = mech;
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104 };
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105 end
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106 end, 100);
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107
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108 -- Process post-success (new token generation, etc.)
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109 module:hook("sasl2/c2s/success", function (event)
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110 local session = event.session;
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111
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112 local token_request = session.fast_token_request;
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113 local client_id = session.client_id;
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114 local stream_from = event.stream.from;
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115 if token_request then
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116 if not client_id or not stream_from then
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117 session.log("warn", "FAST token requested, but missing client id");
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118 return;
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119 end
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120 local token_info = make_token(session.username, client_id, token_request.mechanism)
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121 if token_info then
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122 event.success:tag("token", {
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123 xmlns = xmlns_fast;
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124 expiry = dt.datetime(token_info.expires_at);
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125 token = token_info.token;
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126 }):up();
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127 end
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128 end
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129 end, 75);
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130
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131
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132 -- X-PLAIN-TOKEN mechanism
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133
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134 local function x_plain_token(self, message) --luacheck: ignore 212/self
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135 if not message then
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136 return nil, "malformed-request";
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137 end
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138 return nil, "temporary-auth-failure"; -- FIXME
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139 end
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140
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141 sasl.registerMechanism("X-PLAIN-TOKEN", { "token_test" }, x_plain_token);
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142
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143
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144 -- HT-* mechanisms
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145
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146 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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147 return function (sasl_handler, message)
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148 local backend = sasl_handler.profile[backend_profile_name];
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149 local ok, status, response = backend(mechanism_name, sasl_handler._client_id, message, cb_name and sasl_handler.profile.cb[cb_name] or "");
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150 if not ok then
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151 return "failure", status or "not-authorized";
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152 end
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153 return "success", response;
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154 end
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155 end
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156
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157 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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158 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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159 name,
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160 backend_profile_name,
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161 cb_name
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162 ));
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163 end
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164
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165 register_ht_mechanism("HT-SHA-256-NONE", "ht_sha256", nil);
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166 register_ht_mechanism("HT-SHA-256-UNIQ", "ht_sha256", "tls-unique");
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167 register_ht_mechanism("HT-SHA-256-ENDP", "ht_sha256", "tls-endpoint");
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168 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha256", "tls-exporter");