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annotate mod_sasl2_fast/mod_sasl2_fast.lua @ 5077:e900bbd2e70d

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mod_sasl2_fast: Remove X-TOKEN-PLAIN and related profile handler
author Matthew Wild <mwild1@gmail.com>
date Sat, 15 Oct 2022 20:26:25 +0100
parents eb46abc65dfd
children 36d3f11724c8
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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 jid = require "util.jid";
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5 local st = require "util.stanza";
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6 local now = require "util.time".now;
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7 local hash = require "util.hashes";
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8
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9 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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10
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11 local xmlns_fast = "urn:xmpp:fast:0";
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12 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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13
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14 local token_store = module:open_store("fast_tokens", "map");
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15
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16 local log = module._log;
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17
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18 local function make_token(username, client_id, mechanism)
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19 local new_token = "secret-token:fast-"..id.long();
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20 local key = hash.sha256(client_id, true).."-new";
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21 local issued_at = now();
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22 local token_info = {
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23 mechanism = mechanism;
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24 secret = new_token;
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25 issued_at = issued_at;
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26 expires_at = issued_at + fast_token_ttl;
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27 };
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28 if not token_store:set(username, key, token_info) then
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29 return nil;
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30 end
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31 return token_info;
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32 end
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33
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34 local function new_token_tester(hmac_f)
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35 return function (mechanism, username, client_id, token_hash, cb_data)
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36 local tried_current_token = false;
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37 local key = hash.sha256(client_id, true).."-new";
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38 local token;
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39 repeat
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40 log("debug", "Looking for %s token %s/%s", mechanism, username, key);
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41 token = token_store:get(username, key);
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42 if token and token.mechanism == mechanism then
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43 local expected_hash = hmac_f(token.secret, "Initiator"..cb_data);
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44 if hash.equals(expected_hash, token_hash) then
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45 if token.expires_at < now() then
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46 token_store:set(username, key, nil);
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47 return nil, "credentials-expired";
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48 end
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49 if not tried_current_token then
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50 -- The new token is becoming the current token
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51 token_store:set_keys(username, {
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52 [key] = token_store.remove;
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53 [key:sub(1, -4).."-cur"] = token;
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54 });
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55 end
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56 return true, username, hmac_f(token.secret, "Responder"..cb_data);
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57 end
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58 end
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59 if not tried_current_token then
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60 log("debug", "Trying next token...");
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61 -- Try again with the current token instead
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62 tried_current_token = true;
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63 key = key:sub(1, -4).."-cur";
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64 else
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65 log("debug", "No matching %s token found for %s/%s", mechanism, username, key);
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66 return nil;
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67 end
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68 until false;
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69 end
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70 end
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71
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72 function get_sasl_handler()
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73 local token_auth_profile = {
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74 ht_sha_256 = new_token_tester(hash.hmac_sha256);
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75 };
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76 return sasl.new(module.host, token_auth_profile);
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77 end
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78
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79 -- Advertise FAST to connecting clients
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80 module:hook("advertise-sasl-features", function (event)
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81 local session = event.origin;
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82 local username = session.username;
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83 if not username then
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84 username = jid.node(event.stream.from);
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85 if not username then return; end
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86 end
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87 local sasl_handler = get_sasl_handler(username);
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88 if not sasl_handler then return; end
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89 session.fast_sasl_handler = sasl_handler;
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90 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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91 for mech in pairs(sasl_handler:mechanisms()) do
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92 fast:text_tag("mechanism", mech);
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93 end
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94 event.features:add_child(fast);
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95 end);
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96
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97 -- Process any FAST elements in <authenticate/>
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98 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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99 -- Cache action for future processing (after auth success)
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100 local fast_auth = auth:get_child("fast", xmlns_fast);
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101 if fast_auth then
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102 -- Client says it is using FAST auth, so set our SASL handler
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103 local fast_sasl_handler = session.fast_sasl_handler;
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104 local client_id = auth:get_child_attr("user-agent", nil, "id");
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105 if fast_sasl_handler and client_id then
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106 session.log("debug", "Client is authenticating using FAST");
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107 fast_sasl_handler.profile._client_id = client_id;
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108 fast_sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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109 fast_sasl_handler.userdata = session.sasl_handler.userdata;
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110 session.sasl_handler = fast_sasl_handler;
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111 else
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112 session.log("warn", "Client asked to auth via FAST, but SASL handler or client id missing");
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113 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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114 :tag("malformed-request"):up()
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115 :text_tag("text", "FAST is not available on this stream");
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116 session.send(failure);
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117 return true;
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118 end
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119 end
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120 session.fast_sasl_handler = nil;
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121 local fast_token_request = auth:get_child("request-token", xmlns_fast);
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122 if fast_token_request then
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123 local mech = fast_token_request.attr.mechanism;
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124 session.log("debug", "Client requested new FAST token for %s", mech);
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125 session.fast_token_request = {
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126 mechanism = mech;
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127 };
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128 end
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129 end, 100);
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130
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131 -- Process post-success (new token generation, etc.)
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132 module:hook("sasl2/c2s/success", function (event)
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133 local session = event.session;
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134
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135 local token_request = session.fast_token_request;
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136 local client_id = session.client_id;
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137 if token_request then
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138 if not client_id then
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139 session.log("warn", "FAST token requested, but missing client id");
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140 return;
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141 end
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142 local token_info = make_token(session.username, client_id, token_request.mechanism)
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143 if token_info then
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144 event.success:tag("token", {
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145 xmlns = xmlns_fast;
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146 expiry = dt.datetime(token_info.expires_at);
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147 token = token_info.secret;
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148 }):up();
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149 end
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150 end
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151 end, 75);
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152
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153 -- HT-* mechanisms
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154
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155 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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156 return function (sasl_handler, message)
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157 local backend = sasl_handler.profile[backend_profile_name];
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158 local username, token_hash = message:match("^([^%z]+)%z(.+)$");
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159 if not username then
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160 return "failure", "malformed-request";
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161 end
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162 local cb_data = cb_name and sasl_handler.profile.cb[cb_name](sasl_handler) or "";
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163 local ok, status, response = backend(mechanism_name, username, sasl_handler.profile._client_id, token_hash, cb_data);
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164 if not ok then
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165 return "failure", status or "not-authorized";
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166 end
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167 sasl_handler.username = status;
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168 return "success", response;
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169 end
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170 end
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171
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172 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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173 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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174 name,
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175 backend_profile_name,
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176 cb_name
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177 ),
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178 { cb_name });
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179 end
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180
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181 register_ht_mechanism("HT-SHA-256-NONE", "ht_sha_256", nil);
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182 register_ht_mechanism("HT-SHA-256-UNIQ", "ht_sha_256", "tls-unique");
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183 register_ht_mechanism("HT-SHA-256-ENDP", "ht_sha_256", "tls-endpoint");
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184 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha_256", "tls-exporter");