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annotate mod_sasl2_fast/mod_sasl2_fast.lua @ 5086:dec4b2e31d1c

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mod_rest: Do not allow replies to <iq type=result> from webhooks Replying to a result stanza could cause loops, just as replying to an error. No stanza.name check here but it should be fine since no other kinds of stanzas have type=result, and the boolean logic would most definitely be wrong on the first attempt.
author Kim Alvefur <zash@zash.se>
date Sun, 27 Nov 2022 00:10:38 +0100
parents dda2af7ed02f
children 745c7f4cca40
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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 log("debug", "Token found, but it has expired (%ds ago). Cleaning up...", current_time - token.expires_at);
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51 token_store:set(username, key, nil);
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52 return nil, "credentials-expired";
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53 end
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54 if not tried_current_token and not invalidate then
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55 -- The new token is becoming the current token
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56 token_store:set_keys(username, {
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57 [key] = token_store.remove;
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58 [key:sub(1, -4).."-cur"] = token;
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59 });
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60 end
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61 local rotation_needed;
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62 if invalidate then
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63 token_store:set(username, key, nil);
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64 elseif current_time - token.issued_at > fast_token_min_ttl then
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65 log("debug", "FAST token due for rotation (age: %d)", current_time - token.issued_at);
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66 rotation_needed = true;
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67 end
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68 return true, username, hmac_f(token.secret, "Responder"..cb_data), rotation_needed;
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69 end
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70 end
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71 if not tried_current_token then
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72 log("debug", "Trying next token...");
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73 -- Try again with the current token instead
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74 tried_current_token = true;
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75 key = key:sub(1, -4).."-cur";
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76 else
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77 log("debug", "No matching %s token found for %s/%s", mechanism, username, key);
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78 return nil;
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79 end
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80 until false;
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81 end
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82 end
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83
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84 function get_sasl_handler()
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85 local token_auth_profile = {
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86 ht_sha_256 = new_token_tester(hash.hmac_sha256);
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87 };
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88 local handler = sasl.new(module.host, token_auth_profile);
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89 handler.fast = true;
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90 return handler;
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91 end
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92
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93 -- Advertise FAST to connecting clients
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94 module:hook("advertise-sasl-features", function (event)
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95 local session = event.origin;
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96 local username = session.username;
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97 if not username then
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98 username = jid.node(event.stream.from);
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99 if not username then return; end
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100 end
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101 local sasl_handler = get_sasl_handler(username);
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102 if not sasl_handler then return; end
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103 sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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104 sasl_handler.userdata = session.sasl_handler.userdata;
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105 session.fast_sasl_handler = sasl_handler;
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106 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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107 for mech in pairs(sasl_handler:mechanisms()) do
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108 fast:text_tag("mechanism", mech);
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109 end
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110 event.features:add_child(fast);
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111 end);
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112
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113 -- Process any FAST elements in <authenticate/>
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114 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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115 -- Cache action for future processing (after auth success)
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116 local fast_auth = auth:get_child("fast", xmlns_fast);
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117 if fast_auth then
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118 -- Client says it is using FAST auth, so set our SASL handler
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parents: 5062
diff changeset
119 local fast_sasl_handler = session.fast_sasl_handler;
5072
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diff changeset
120 local client_id = auth:get_child_attr("user-agent", nil, "id");
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parents: 5071
diff changeset
121 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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parents: 5066
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122 session.log("debug", "Client is authenticating using FAST");
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
123 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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parents: 5072
diff changeset
124 fast_sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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diff changeset
125 fast_sasl_handler.userdata = session.sasl_handler.userdata;
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
126 local invalidate = fast_auth.attr.invalidate;
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diff changeset
127 fast_sasl_handler.invalidate = invalidate == "1" or invalidate == "true";
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128 -- Set our SASL handler as the session's SASL handler
5068
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129 session.sasl_handler = fast_sasl_handler;
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130 else
5076
eb46abc65dfd mod_sasl2_fast: Improved logging
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diff changeset
131 session.log("warn", "Client asked to auth via FAST, but SASL handler or client id missing");
5068
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parents: 5066
diff changeset
132 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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133 :tag("malformed-request"):up()
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134 :text_tag("text", "FAST is not available on this stream");
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135 session.send(failure);
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diff changeset
136 return true;
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diff changeset
137 end
5062
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parents:
diff changeset
138 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
139 session.fast_sasl_handler = nil;
5072
d41677929f68 mod_sasl2_fast: Fixes for <authenticate> processing
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diff changeset
140 local fast_token_request = auth:get_child("request-token", xmlns_fast);
5062
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parents:
diff changeset
141 if fast_token_request then
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 local mech = fast_token_request.attr.mechanism;
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parents:
diff changeset
143 session.log("debug", "Client requested new FAST token for %s", mech);
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parents:
diff changeset
144 session.fast_token_request = {
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parents:
diff changeset
145 mechanism = mech;
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parents:
diff changeset
146 };
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parents:
diff changeset
147 end
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parents:
diff changeset
148 end, 100);
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parents:
diff changeset
149
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
150 -- Process post-success (new token generation, etc.)
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parents:
diff changeset
151 module:hook("sasl2/c2s/success", function (event)
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parents:
diff changeset
152 local session = event.session;
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parents:
diff changeset
153
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
154 local token_request = session.fast_token_request;
5066
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diff changeset
155 local client_id = session.client_id;
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
156 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
157 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
158 if not client_id then
5066
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parents: 5062
diff changeset
159 session.log("warn", "FAST token requested, but missing client id");
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parents: 5062
diff changeset
160 return;
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parents: 5062
diff changeset
161 end
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
162 local mechanism = token_request and token_request.mechanism or session.sasl_handler.selected;
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
163 local token_info = make_token(session.username, client_id, mechanism)
5066
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parents: 5062
diff changeset
164 if token_info then
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
165 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
166 event.success:tag("token", {
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
167 xmlns = xmlns_fast;
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
168 expiry = dt.datetime(token_info.expires_at);
5074
1726050e9a4b mod_sasl2_fast: Fix field name for returned secret
Matthew Wild <mwild1@gmail.com>
parents: 5073
diff changeset
169 token = token_info.secret;
5062
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
170 }):up();
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
171 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
172 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
173 end, 75);
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
174
5066
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parents: 5062
diff changeset
175 -- HT-* mechanisms
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parents: 5062
diff changeset
176
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
177 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
178 return function (sasl_handler, message)
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parents: 5062
diff changeset
179 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
180 local authc_username, token_hash = message:match("^([^%z]+)%z(.+)$");
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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parents: 5078
diff changeset
181 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
182 return "failure", "malformed-request";
bc983da908e6 mod_sasl2_fast: Take username from SASL exchange rather than stream@from
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parents: 5070
diff changeset
183 end
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parents: 5070
diff changeset
184 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
185 local ok, authz_username, response, rotation_needed = backend(
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
186 mechanism_name,
5082
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parents: 5078
diff changeset
187 authc_username,
5078
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parents: 5077
diff changeset
188 sasl_handler.client_id,
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parents: 5077
diff changeset
189 token_hash,
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parents: 5077
diff changeset
190 cb_data,
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parents: 5077
diff changeset
191 sasl_handler.invalidate
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parents: 5077
diff changeset
192 );
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
193 if not ok then
5082
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parents: 5078
diff changeset
194 -- authz_username is error condition
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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parents: 5078
diff changeset
195 return "failure", authz_username or "not-authorized";
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
196 end
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
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parents: 5078
diff changeset
197 sasl_handler.username = authz_username;
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
198 sasl_handler.rotation_needed = rotation_needed;
5066
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parents: 5062
diff changeset
199 return "success", response;
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parents: 5062
diff changeset
200 end
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
201 end
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
202
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
203 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
204 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
205 name,
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
206 backend_profile_name,
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
207 cb_name
5075
ba2f1292d5fe mod_sasl2_fast: Register HT-* mechanisms with the required channel binding
Matthew Wild <mwild1@gmail.com>
parents: 5074
diff changeset
208 ),
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
Matthew Wild <mwild1@gmail.com>
parents: 5082
diff changeset
209 cb_name and { cb_name } or nil);
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
210 end
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
211
5069
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
212 register_ht_mechanism("HT-SHA-256-NONE", "ht_sha_256", nil);
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
213 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
214 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
215 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha_256", "tls-exporter");