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annotate mod_sasl2_fast/mod_sasl2_fast.lua @ 5078:36d3f11724c8

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mod_sasl2_fast: Implement rotation and invalidation
author Matthew Wild <mwild1@gmail.com>
date Sat, 15 Oct 2022 21:01:04 +0100
parents e900bbd2e70d
children ddb1940b08e0
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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 -- Tokens expire after 21 days by default
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10 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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11 -- Tokens are automatically rotated daily
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12 local fast_token_min_ttl = module:get_option_number("sasl2_fast_token_min_ttl", 86400);
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13
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14 local xmlns_fast = "urn:xmpp:fast:0";
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15 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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16
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17 local token_store = module:open_store("fast_tokens", "map");
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18
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19 local log = module._log;
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20
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21 local function make_token(username, client_id, mechanism)
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22 local new_token = "secret-token:fast-"..id.long();
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23 local key = hash.sha256(client_id, true).."-new";
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24 local issued_at = now();
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25 local token_info = {
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26 mechanism = mechanism;
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27 secret = new_token;
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28 issued_at = issued_at;
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29 expires_at = issued_at + fast_token_ttl;
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30 };
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31 if not token_store:set(username, key, token_info) then
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32 return nil;
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33 end
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34 return token_info;
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35 end
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36
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37 local function new_token_tester(hmac_f)
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38 return function (mechanism, username, client_id, token_hash, cb_data, invalidate)
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39 local tried_current_token = false;
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40 local key = hash.sha256(client_id, true).."-new";
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41 local token;
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42 repeat
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43 log("debug", "Looking for %s token %s/%s", mechanism, username, key);
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44 token = token_store:get(username, key);
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45 if token and token.mechanism == mechanism then
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46 local expected_hash = hmac_f(token.secret, "Initiator"..cb_data);
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47 if hash.equals(expected_hash, token_hash) then
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48 local current_time = now();
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49 if token.expires_at < current_time then
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50 token_store:set(username, key, nil);
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51 return nil, "credentials-expired";
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52 end
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53 if not tried_current_token and not invalidate then
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54 -- The new token is becoming the current token
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55 token_store:set_keys(username, {
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56 [key] = token_store.remove;
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57 [key:sub(1, -4).."-cur"] = token;
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58 });
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59 end
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60 local rotation_needed;
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61 if invalidate then
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62 token_store:set(username, key, nil);
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63 elseif current_time - token.issued_at > fast_token_min_ttl then
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64 rotation_needed = true;
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65 end
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66 return true, username, hmac_f(token.secret, "Responder"..cb_data), token, rotation_needed;
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67 end
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68 end
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69 if not tried_current_token then
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70 log("debug", "Trying next token...");
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71 -- Try again with the current token instead
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72 tried_current_token = true;
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73 key = key:sub(1, -4).."-cur";
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74 else
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75 log("debug", "No matching %s token found for %s/%s", mechanism, username, key);
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76 return nil;
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77 end
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78 until false;
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79 end
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80 end
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81
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82 function get_sasl_handler()
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83 local token_auth_profile = {
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84 ht_sha_256 = new_token_tester(hash.hmac_sha256);
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85 };
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86 local handler = sasl.new(module.host, token_auth_profile);
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87 handler.fast = true;
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88 return handler;
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89 end
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90
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91 -- Advertise FAST to connecting clients
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92 module:hook("advertise-sasl-features", function (event)
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93 local session = event.origin;
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94 local username = session.username;
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95 if not username then
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96 username = jid.node(event.stream.from);
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97 if not username then return; end
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98 end
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99 local sasl_handler = get_sasl_handler(username);
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100 if not sasl_handler then return; end
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101 session.fast_sasl_handler = sasl_handler;
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102 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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103 for mech in pairs(sasl_handler:mechanisms()) do
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104 fast:text_tag("mechanism", mech);
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105 end
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106 event.features:add_child(fast);
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107 end);
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108
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109 -- Process any FAST elements in <authenticate/>
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110 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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111 -- Cache action for future processing (after auth success)
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112 local fast_auth = auth:get_child("fast", xmlns_fast);
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113 if fast_auth then
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114 -- Client says it is using FAST auth, so set our SASL handler
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115 local fast_sasl_handler = session.fast_sasl_handler;
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116 local client_id = auth:get_child_attr("user-agent", nil, "id");
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117 if fast_sasl_handler and client_id then
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118 session.log("debug", "Client is authenticating using FAST");
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119 fast_sasl_handler.client_id = client_id;
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120 fast_sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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121 fast_sasl_handler.userdata = session.sasl_handler.userdata;
5078
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122 local invalidate = fast_auth.attr.invalidate;
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123 fast_sasl_handler.invalidate = invalidate == "1" or invalidate == "true";
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124 -- Set our SASL handler as the session's SASL handler
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125 session.sasl_handler = fast_sasl_handler;
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126 else
5076
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127 session.log("warn", "Client asked to auth via FAST, but SASL handler or client id missing");
5068
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128 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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129 :tag("malformed-request"):up()
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130 :text_tag("text", "FAST is not available on this stream");
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131 session.send(failure);
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132 return true;
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133 end
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134 end
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135 session.fast_sasl_handler = nil;
5072
d41677929f68 mod_sasl2_fast: Fixes for <authenticate> processing
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136 local fast_token_request = auth:get_child("request-token", xmlns_fast);
5062
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137 if fast_token_request then
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diff changeset
138 local mech = fast_token_request.attr.mechanism;
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diff changeset
139 session.log("debug", "Client requested new FAST token for %s", mech);
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140 session.fast_token_request = {
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141 mechanism = mech;
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parents:
diff changeset
142 };
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diff changeset
143 end
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diff changeset
144 end, 100);
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diff changeset
145
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146 -- Process post-success (new token generation, etc.)
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147 module:hook("sasl2/c2s/success", function (event)
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148 local session = event.session;
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149
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150 local token_request = session.fast_token_request;
5066
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151 local client_id = session.client_id;
5078
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152 local sasl_handler = session.sasl_handler;
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153 if token_request or sasl_handler.fast and sasl_handler.rotation_needed then
5068
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154 if not client_id then
5066
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155 session.log("warn", "FAST token requested, but missing client id");
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156 return;
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157 end
5078
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diff changeset
158 local mechanism = token_request and token_request.mechanism or session.sasl_handler.selected;
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diff changeset
159 local token_info = make_token(session.username, client_id, mechanism)
5066
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160 if token_info then
5078
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diff changeset
161 session.log("debug", "Provided new FAST token to client");
5062
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parents:
diff changeset
162 event.success:tag("token", {
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diff changeset
163 xmlns = xmlns_fast;
5066
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diff changeset
164 expiry = dt.datetime(token_info.expires_at);
5074
1726050e9a4b mod_sasl2_fast: Fix field name for returned secret
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parents: 5073
diff changeset
165 token = token_info.secret;
5062
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parents:
diff changeset
166 }):up();
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parents:
diff changeset
167 end
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parents:
diff changeset
168 end
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parents:
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169 end, 75);
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parents:
diff changeset
170
5066
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diff changeset
171 -- HT-* mechanisms
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diff changeset
172
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diff changeset
173 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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174 return function (sasl_handler, message)
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diff changeset
175 local backend = sasl_handler.profile[backend_profile_name];
5071
bc983da908e6 mod_sasl2_fast: Take username from SASL exchange rather than stream@from
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parents: 5070
diff changeset
176 local username, token_hash = message:match("^([^%z]+)%z(.+)$");
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177 if not username then
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178 return "failure", "malformed-request";
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179 end
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180 local cb_data = cb_name and sasl_handler.profile.cb[cb_name](sasl_handler) or "";
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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diff changeset
181 local ok, status, response, rotation_needed = backend(
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diff changeset
182 mechanism_name,
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diff changeset
183 username,
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diff changeset
184 sasl_handler.client_id,
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185 token_hash,
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diff changeset
186 cb_data,
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diff changeset
187 sasl_handler.invalidate
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188 );
5066
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189 if not ok then
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diff changeset
190 return "failure", status or "not-authorized";
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diff changeset
191 end
5071
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diff changeset
192 sasl_handler.username = status;
5078
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diff changeset
193 sasl_handler.rotation_needed = rotation_needed;
5066
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diff changeset
194 return "success", response;
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diff changeset
195 end
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diff changeset
196 end
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diff changeset
197
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diff changeset
198 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
199 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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parents: 5062
diff changeset
200 name,
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parents: 5062
diff changeset
201 backend_profile_name,
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parents: 5062
diff changeset
202 cb_name
5075
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parents: 5074
diff changeset
203 ),
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parents: 5074
diff changeset
204 { cb_name });
5066
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parents: 5062
diff changeset
205 end
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parents: 5062
diff changeset
206
5069
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
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parents: 5068
diff changeset
207 register_ht_mechanism("HT-SHA-256-NONE", "ht_sha_256", nil);
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
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parents: 5068
diff changeset
208 register_ht_mechanism("HT-SHA-256-UNIQ", "ht_sha_256", "tls-unique");
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parents: 5068
diff changeset
209 register_ht_mechanism("HT-SHA-256-ENDP", "ht_sha_256", "tls-endpoint");
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
210 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha_256", "tls-exporter");