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annotate mod_sasl2_fast/mod_sasl2_fast.lua @ 5095:745c7f4cca40

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mod_sasl2_fast: Add explicit dependency on mod_sasl2 Ensures mod_sasl2 is installed and loaded so it can fire the relevant events.
author Kim Alvefur <zash@zash.se>
date Mon, 28 Nov 2022 19:12:37 +0100
parents dda2af7ed02f
children 471cbb583a1d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 module:depends("sasl2");
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10
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11 -- Tokens expire after 21 days by default
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12 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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13 -- Tokens are automatically rotated daily
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14 local fast_token_min_ttl = module:get_option_number("sasl2_fast_token_min_ttl", 86400);
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15
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16 local xmlns_fast = "urn:xmpp:fast:0";
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17 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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18
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19 local token_store = module:open_store("fast_tokens", "map");
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20
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21 local log = module._log;
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22
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23 local function make_token(username, client_id, mechanism)
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24 local new_token = "secret-token:fast-"..id.long();
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25 local key = hash.sha256(client_id, true).."-new";
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26 local issued_at = now();
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27 local token_info = {
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28 mechanism = mechanism;
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29 secret = new_token;
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30 issued_at = issued_at;
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31 expires_at = issued_at + fast_token_ttl;
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32 };
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33 if not token_store:set(username, key, token_info) then
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34 return nil;
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35 end
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36 return token_info;
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37 end
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38
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39 local function new_token_tester(hmac_f)
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40 return function (mechanism, username, client_id, token_hash, cb_data, invalidate)
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41 local tried_current_token = false;
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42 local key = hash.sha256(client_id, true).."-new";
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43 local token;
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44 repeat
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45 log("debug", "Looking for %s token %s/%s", mechanism, username, key);
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46 token = token_store:get(username, key);
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47 if token and token.mechanism == mechanism then
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48 local expected_hash = hmac_f(token.secret, "Initiator"..cb_data);
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49 if hash.equals(expected_hash, token_hash) then
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50 local current_time = now();
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51 if token.expires_at < current_time then
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52 log("debug", "Token found, but it has expired (%ds ago). Cleaning up...", current_time - token.expires_at);
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53 token_store:set(username, key, nil);
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54 return nil, "credentials-expired";
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55 end
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56 if not tried_current_token and not invalidate then
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57 -- The new token is becoming the current token
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58 token_store:set_keys(username, {
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59 [key] = token_store.remove;
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60 [key:sub(1, -4).."-cur"] = token;
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61 });
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62 end
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63 local rotation_needed;
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64 if invalidate then
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65 token_store:set(username, key, nil);
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66 elseif current_time - token.issued_at > fast_token_min_ttl then
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67 log("debug", "FAST token due for rotation (age: %d)", current_time - token.issued_at);
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68 rotation_needed = true;
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69 end
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70 return true, username, hmac_f(token.secret, "Responder"..cb_data), rotation_needed;
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71 end
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72 end
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73 if not tried_current_token then
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74 log("debug", "Trying next token...");
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75 -- Try again with the current token instead
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76 tried_current_token = true;
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77 key = key:sub(1, -4).."-cur";
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78 else
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79 log("debug", "No matching %s token found for %s/%s", mechanism, username, key);
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80 return nil;
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81 end
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82 until false;
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83 end
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84 end
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85
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86 function get_sasl_handler()
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87 local token_auth_profile = {
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88 ht_sha_256 = new_token_tester(hash.hmac_sha256);
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89 };
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90 local handler = sasl.new(module.host, token_auth_profile);
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91 handler.fast = true;
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92 return handler;
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93 end
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94
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95 -- Advertise FAST to connecting clients
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96 module:hook("advertise-sasl-features", function (event)
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97 local session = event.origin;
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98 local username = session.username;
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99 if not username then
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100 username = jid.node(event.stream.from);
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101 if not username then return; end
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102 end
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103 local sasl_handler = get_sasl_handler(username);
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104 if not sasl_handler then return; end
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105 sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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106 sasl_handler.userdata = session.sasl_handler.userdata;
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107 session.fast_sasl_handler = sasl_handler;
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108 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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109 for mech in pairs(sasl_handler:mechanisms()) do
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110 fast:text_tag("mechanism", mech);
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111 end
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112 event.features:add_child(fast);
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113 end);
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114
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115 -- Process any FAST elements in <authenticate/>
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116 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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117 -- Cache action for future processing (after auth success)
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118 local fast_auth = auth:get_child("fast", xmlns_fast);
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119 if fast_auth then
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diff changeset
120 -- Client says it is using FAST auth, so set our SASL handler
5066
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121 local fast_sasl_handler = session.fast_sasl_handler;
5072
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122 local client_id = auth:get_child_attr("user-agent", nil, "id");
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parents: 5071
diff changeset
123 if fast_sasl_handler and client_id then
5068
20e635eb4cdc mod_sasl2_fast: More robust handling of stream@from and user-agent@id
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124 session.log("debug", "Client is authenticating using FAST");
5078
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diff changeset
125 fast_sasl_handler.client_id = client_id;
5073
f158f18704c0 mod_sasl2_fast: Copy channel binding data state from original SASL handler
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diff changeset
126 fast_sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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diff changeset
127 fast_sasl_handler.userdata = session.sasl_handler.userdata;
5078
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diff changeset
128 local invalidate = fast_auth.attr.invalidate;
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129 fast_sasl_handler.invalidate = invalidate == "1" or invalidate == "true";
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130 -- Set our SASL handler as the session's SASL handler
5068
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131 session.sasl_handler = fast_sasl_handler;
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132 else
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133 session.log("warn", "Client asked to auth via FAST, but SASL handler or client id missing");
5068
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134 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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135 :tag("malformed-request"):up()
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136 :text_tag("text", "FAST is not available on this stream");
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137 session.send(failure);
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138 return true;
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diff changeset
139 end
5062
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diff changeset
140 end
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parents:
diff changeset
141 session.fast_sasl_handler = nil;
5072
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diff changeset
142 local fast_token_request = auth:get_child("request-token", xmlns_fast);
5062
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diff changeset
143 if fast_token_request then
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parents:
diff changeset
144 local mech = fast_token_request.attr.mechanism;
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diff changeset
145 session.log("debug", "Client requested new FAST token for %s", mech);
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parents:
diff changeset
146 session.fast_token_request = {
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diff changeset
147 mechanism = mech;
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parents:
diff changeset
148 };
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parents:
diff changeset
149 end
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parents:
diff changeset
150 end, 100);
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parents:
diff changeset
151
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parents:
diff changeset
152 -- Process post-success (new token generation, etc.)
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diff changeset
153 module:hook("sasl2/c2s/success", function (event)
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154 local session = event.session;
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diff changeset
155
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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diff changeset
156 local token_request = session.fast_token_request;
5066
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diff changeset
157 local client_id = session.client_id;
5078
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diff changeset
158 local sasl_handler = session.sasl_handler;
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
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parents: 5082
diff changeset
159 if token_request or (sasl_handler.fast and sasl_handler.rotation_needed) then
5068
20e635eb4cdc mod_sasl2_fast: More robust handling of stream@from and user-agent@id
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parents: 5066
diff changeset
160 if not client_id then
5066
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parents: 5062
diff changeset
161 session.log("warn", "FAST token requested, but missing client id");
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diff changeset
162 return;
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parents: 5062
diff changeset
163 end
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
164 local mechanism = token_request and token_request.mechanism or session.sasl_handler.selected;
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parents: 5077
diff changeset
165 local token_info = make_token(session.username, client_id, mechanism)
5066
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parents: 5062
diff changeset
166 if token_info then
5078
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parents: 5077
diff changeset
167 session.log("debug", "Provided new FAST token to client");
5062
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
168 event.success:tag("token", {
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parents:
diff changeset
169 xmlns = xmlns_fast;
5066
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parents: 5062
diff changeset
170 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
171 token = token_info.secret;
5062
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parents:
diff changeset
172 }):up();
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parents:
diff changeset
173 end
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parents:
diff changeset
174 end
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parents:
diff changeset
175 end, 75);
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parents:
diff changeset
176
5066
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diff changeset
177 -- HT-* mechanisms
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diff changeset
178
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diff changeset
179 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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diff changeset
180 return function (sasl_handler, message)
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parents: 5062
diff changeset
181 local backend = sasl_handler.profile[backend_profile_name];
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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parents: 5078
diff changeset
182 local authc_username, token_hash = message:match("^([^%z]+)%z(.+)$");
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parents: 5078
diff changeset
183 if not authc_username then
5071
bc983da908e6 mod_sasl2_fast: Take username from SASL exchange rather than stream@from
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parents: 5070
diff changeset
184 return "failure", "malformed-request";
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diff changeset
185 end
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parents: 5070
diff changeset
186 local cb_data = cb_name and sasl_handler.profile.cb[cb_name](sasl_handler) or "";
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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parents: 5078
diff changeset
187 local ok, authz_username, response, rotation_needed = backend(
5078
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diff changeset
188 mechanism_name,
5082
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diff changeset
189 authc_username,
5078
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diff changeset
190 sasl_handler.client_id,
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diff changeset
191 token_hash,
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diff changeset
192 cb_data,
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diff changeset
193 sasl_handler.invalidate
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parents: 5077
diff changeset
194 );
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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diff changeset
195 if not ok then
5082
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parents: 5078
diff changeset
196 -- authz_username is error condition
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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diff changeset
197 return "failure", authz_username or "not-authorized";
5066
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parents: 5062
diff changeset
198 end
5082
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parents: 5078
diff changeset
199 sasl_handler.username = authz_username;
5078
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parents: 5077
diff changeset
200 sasl_handler.rotation_needed = rotation_needed;
5066
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parents: 5062
diff changeset
201 return "success", response;
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parents: 5062
diff changeset
202 end
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parents: 5062
diff changeset
203 end
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parents: 5062
diff changeset
204
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
205 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
206 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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parents: 5062
diff changeset
207 name,
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parents: 5062
diff changeset
208 backend_profile_name,
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parents: 5062
diff changeset
209 cb_name
5075
ba2f1292d5fe mod_sasl2_fast: Register HT-* mechanisms with the required channel binding
Matthew Wild <mwild1@gmail.com>
parents: 5074
diff changeset
210 ),
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
Matthew Wild <mwild1@gmail.com>
parents: 5082
diff changeset
211 cb_name and { cb_name } or nil);
5066
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parents: 5062
diff changeset
212 end
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parents: 5062
diff changeset
213
5069
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
214 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
215 register_ht_mechanism("HT-SHA-256-UNIQ", "ht_sha_256", "tls-unique");
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
Matthew Wild <mwild1@gmail.com>
parents: 5082
diff changeset
216 register_ht_mechanism("HT-SHA-256-ENDP", "ht_sha_256", "tls-server-end-point");
5069
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
217 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha_256", "tls-exporter");