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annotate mod_sasl2_fast/mod_sasl2_fast.lua @ 5818:d3b69859553a

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mod_password_policy: Change error type from 'cancel' to 'modify' This makes more sense, as the problem relates to the data that has been entered, and therefore the request could be retried with different data.
author Matthew Wild <mwild1@gmail.com>
date Mon, 08 Jan 2024 17:28:39 +0000
parents b10a7082b3c3
children
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1 local usermanager = require "core.usermanager";
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2
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3 local sasl = require "util.sasl";
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4 local dt = require "util.datetime";
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5 local id = require "util.id";
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6 local jid = require "util.jid";
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7 local st = require "util.stanza";
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8 local now = require "util.time".now;
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9 local hash = require "util.hashes";
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10
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11 module:depends("sasl2");
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12
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13 -- Tokens expire after 21 days by default
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14 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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15 -- Tokens are automatically rotated daily
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16 local fast_token_min_ttl = module:get_option_number("sasl2_fast_token_min_ttl", 86400);
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17
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18 local xmlns_fast = "urn:xmpp:fast:0";
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19 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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20
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21 local token_store = module:open_store("fast_tokens", "map");
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22
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23 local log = module._log;
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24
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25 local function make_token(username, client_id, mechanism)
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26 local new_token = "secret-token:fast-"..id.long();
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27 local key = hash.sha256(client_id, true).."-new";
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28 local issued_at = now();
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29 local token_info = {
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30 mechanism = mechanism;
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31 secret = new_token;
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32 issued_at = issued_at;
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33 expires_at = issued_at + fast_token_ttl;
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34 };
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35 if not token_store:set(username, key, token_info) then
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36 return nil;
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37 end
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38 return token_info;
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39 end
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40
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41 local function new_token_tester(hmac_f)
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42 return function (mechanism, username, client_id, token_hash, cb_data, invalidate)
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43 local account_info = usermanager.get_account_info(username, module.host);
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44 local last_password_change = account_info and account_info.password_updated;
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45 local tried_current_token = false;
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46 local key = hash.sha256(client_id, true).."-new";
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47 local token;
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48 repeat
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49 log("debug", "Looking for %s token %s/%s", mechanism, username, key);
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50 token = token_store:get(username, key);
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51 if token and token.mechanism == mechanism then
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52 local expected_hash = hmac_f(token.secret, "Initiator"..cb_data);
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53 if hash.equals(expected_hash, token_hash) then
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54 local current_time = now();
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55 if token.expires_at < current_time then
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56 log("debug", "Token found, but it has expired (%ds ago). Cleaning up...", current_time - token.expires_at);
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57 token_store:set(username, key, nil);
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58 return nil, "credentials-expired";
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59 elseif last_password_change and token.issued_at < last_password_change then
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60 log("debug", "Token found, but issued prior to password change (%ds ago). Cleaning up...",
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61 current_time - last_password_change
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62 );
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63 token_store:set(username, key, nil);
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64 return nil, "credentials-expired";
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65 end
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66 if not tried_current_token and not invalidate then
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67 -- The new token is becoming the current token
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68 token_store:set_keys(username, {
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69 [key] = token_store.remove;
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70 [key:sub(1, -5).."-cur"] = token;
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71 });
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72 end
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73 local rotation_needed;
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74 if invalidate then
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75 token_store:set(username, key, nil);
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76 elseif current_time - token.issued_at > fast_token_min_ttl then
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77 log("debug", "FAST token due for rotation (age: %d)", current_time - token.issued_at);
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78 rotation_needed = true;
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79 end
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80 return true, username, hmac_f(token.secret, "Responder"..cb_data), rotation_needed;
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81 end
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82 end
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83 if not tried_current_token then
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84 log("debug", "Trying next token...");
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85 -- Try again with the current token instead
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86 tried_current_token = true;
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87 key = key:sub(1, -5).."-cur";
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88 else
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89 log("debug", "No matching %s token found for %s/%s", mechanism, username, key);
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90 return nil;
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91 end
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92 until false;
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93 end
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94 end
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95
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96 function get_sasl_handler()
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97 local token_auth_profile = {
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98 ht_sha_256 = new_token_tester(hash.hmac_sha256);
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99 };
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100 local handler = sasl.new(module.host, token_auth_profile);
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101 handler.fast = true;
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102 return handler;
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103 end
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104
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105 -- Advertise FAST to connecting clients
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106 module:hook("advertise-sasl-features", function (event)
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107 local session = event.origin;
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108 local username = session.username;
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109 if not username then
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110 username = jid.node(event.stream.from);
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111 if not username then return; end
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112 end
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113 local sasl_handler = get_sasl_handler(username);
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114 if not sasl_handler then return; end
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115 sasl_handler.fast_auth = true; -- For informational purposes
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116 -- Copy channel binding info from primary SASL handler
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117 sasl_handler.profile.cb = session.sasl_handler.profile.cb;
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118 sasl_handler.userdata = session.sasl_handler.userdata;
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119 -- Store this handler, in case we later want to use it for authenticating
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diff changeset
120 session.fast_sasl_handler = sasl_handler;
5062
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
121 local fast = st.stanza("fast", { xmlns = xmlns_fast });
5066
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diff changeset
122 for mech in pairs(sasl_handler:mechanisms()) do
5062
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parents:
diff changeset
123 fast:text_tag("mechanism", mech);
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parents:
diff changeset
124 end
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parents:
diff changeset
125 event.features:add_child(fast);
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
126 end);
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parents:
diff changeset
127
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
128 -- Process any FAST elements in <authenticate/>
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parents:
diff changeset
129 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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diff changeset
130 -- Cache action for future processing (after auth success)
5072
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diff changeset
131 local fast_auth = auth:get_child("fast", xmlns_fast);
5062
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132 if fast_auth then
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diff changeset
133 -- Client says it is using FAST auth, so set our SASL handler
5066
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diff changeset
134 local fast_sasl_handler = session.fast_sasl_handler;
5072
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parents: 5071
diff changeset
135 local client_id = auth:get_child_attr("user-agent", nil, "id");
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parents: 5071
diff changeset
136 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
diff changeset
137 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
138 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
139 fast_sasl_handler.profile.cb = session.sasl_handler.profile.cb;
f158f18704c0 mod_sasl2_fast: Copy channel binding data state from original SASL handler
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parents: 5072
diff changeset
140 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
141 local invalidate = fast_auth.attr.invalidate;
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parents: 5077
diff changeset
142 fast_sasl_handler.invalidate = invalidate == "1" or invalidate == "true";
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parents: 5077
diff changeset
143 -- Set our SASL handler as the session's SASL handler
5068
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diff changeset
144 session.sasl_handler = fast_sasl_handler;
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diff changeset
145 else
5076
eb46abc65dfd mod_sasl2_fast: Improved logging
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parents: 5075
diff changeset
146 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
147 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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parents: 5066
diff changeset
148 :tag("malformed-request"):up()
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149 :text_tag("text", "FAST is not available on this stream");
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diff changeset
150 session.send(failure);
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diff changeset
151 return true;
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diff changeset
152 end
5062
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parents:
diff changeset
153 end
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parents:
diff changeset
154 session.fast_sasl_handler = nil;
5072
d41677929f68 mod_sasl2_fast: Fixes for <authenticate> processing
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parents: 5071
diff changeset
155 local fast_token_request = auth:get_child("request-token", xmlns_fast);
5062
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
156 if fast_token_request then
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
157 local mech = fast_token_request.attr.mechanism;
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parents:
diff changeset
158 session.log("debug", "Client requested new FAST token for %s", mech);
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parents:
diff changeset
159 session.fast_token_request = {
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parents:
diff changeset
160 mechanism = mech;
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parents:
diff changeset
161 };
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parents:
diff changeset
162 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
163 end, 100);
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parents:
diff changeset
164
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
165 -- Process post-success (new token generation, etc.)
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parents:
diff changeset
166 module:hook("sasl2/c2s/success", function (event)
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parents:
diff changeset
167 local session = event.session;
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parents:
diff changeset
168
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
169 local token_request = session.fast_token_request;
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
170 local client_id = session.client_id;
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
171 local sasl_handler = session.sasl_handler;
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
Matthew Wild <mwild1@gmail.com>
parents: 5082
diff changeset
172 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
Matthew Wild <mwild1@gmail.com>
parents: 5066
diff changeset
173 if not client_id then
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
174 session.log("warn", "FAST token requested, but missing client id");
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parents: 5062
diff changeset
175 return;
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
176 end
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
177 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
178 local token_info = make_token(session.username, client_id, mechanism)
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
179 if token_info then
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
180 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
181 event.success:tag("token", {
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parents:
diff changeset
182 xmlns = xmlns_fast;
5066
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parents: 5062
diff changeset
183 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
184 token = token_info.secret;
5062
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parents:
diff changeset
185 }):up();
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
186 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
187 end
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
188 end, 75);
38a0e3621181 mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
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parents:
diff changeset
189
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
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parents: 5062
diff changeset
190 -- HT-* mechanisms
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
191
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
192 local function new_ht_mechanism(mechanism_name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
193 return function (sasl_handler, message)
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parents: 5062
diff changeset
194 local backend = sasl_handler.profile[backend_profile_name];
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
195 local authc_username, token_hash = message:match("^([^%z]+)%z(.+)$");
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
196 if not authc_username then
5071
bc983da908e6 mod_sasl2_fast: Take username from SASL exchange rather than stream@from
Matthew Wild <mwild1@gmail.com>
parents: 5070
diff changeset
197 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
198 end
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parents: 5070
diff changeset
199 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)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
200 local ok, authz_username, response, rotation_needed = backend(
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
201 mechanism_name,
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
202 authc_username,
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
203 sasl_handler.client_id,
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
204 token_hash,
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
205 cb_data,
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
206 sasl_handler.invalidate
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
Matthew Wild <mwild1@gmail.com>
parents: 5077
diff changeset
207 );
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
208 if not ok then
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
209 -- authz_username is error condition
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
210 return "failure", authz_username or "not-authorized";
5066
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
211 end
5082
ddb1940b08e0 mod_sasl2_fast: Clean up backend return values (fixes constant rotation)
Matthew Wild <mwild1@gmail.com>
parents: 5078
diff changeset
212 sasl_handler.username = authz_username;
5078
36d3f11724c8 mod_sasl2_fast: Implement rotation and invalidation
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parents: 5077
diff changeset
213 sasl_handler.rotation_needed = rotation_needed;
5066
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parents: 5062
diff changeset
214 return "success", response;
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parents: 5062
diff changeset
215 end
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
216 end
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
217
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
218 local function register_ht_mechanism(name, backend_profile_name, cb_name)
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parents: 5062
diff changeset
219 return sasl.registerMechanism(name, { backend_profile_name }, new_ht_mechanism(
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parents: 5062
diff changeset
220 name,
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
221 backend_profile_name,
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Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
222 cb_name
5075
ba2f1292d5fe mod_sasl2_fast: Register HT-* mechanisms with the required channel binding
Matthew Wild <mwild1@gmail.com>
parents: 5074
diff changeset
223 ),
5083
4837232474ca mod_sasl2_fast: Fixes to make channel binding work again
Matthew Wild <mwild1@gmail.com>
parents: 5082
diff changeset
224 cb_name and { cb_name } or nil);
5066
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parents: 5062
diff changeset
225 end
74145faceba2 mod_sasl2_fast: Implement most of FAST + SASL HT-SHA-256
Matthew Wild <mwild1@gmail.com>
parents: 5062
diff changeset
226
5069
e8342ae5ae12 mod_sasl2_fast: Improve backend profile name and correctly use it everywhere
Matthew Wild <mwild1@gmail.com>
parents: 5068
diff changeset
227 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
228 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
229 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
230 register_ht_mechanism("HT-SHA-256-EXPR", "ht_sha_256", "tls-exporter");
5287
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
231
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
232 -- Public API
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
233
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
234 --luacheck: ignore 131
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
235 function is_client_fast(username, client_id, last_password_change)
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
236 local client_id_hash = hash.sha256(client_id, true);
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
237 local curr_time = now();
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
238 local cur = token_store:get(username, client_id_hash.."-cur");
4834eaf24fc1 mod_sasl2_fast: Add an API that allows modules to check if a client has FAST
Matthew Wild <mwild1@gmail.com>
parents: 5286
diff changeset
239 if cur and cur.expires_at >= curr_time and (not last_password_change or last_password_change < cur.issued_at) then
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240 return true;
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241 end
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242 local new = token_store:get(username, client_id_hash.."-new");
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243 if new and new.expires_at >= curr_time and (not last_password_change or last_password_change < new.issued_at) then
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244 return true;
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245 end
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246 return false;
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247 end
5303
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248
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249 function revoke_fast_tokens(username, client_id)
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250 local client_id_hash = hash.sha256(client_id, true);
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251 local cur_ok = token_store:set(username, client_id_hash.."-cur", nil);
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252 local new_ok = token_store:set(username, client_id_hash.."-new", nil);
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253 return cur_ok and new_ok;
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254 end