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mod_unified_push/mod_unified_push.lua @ 5147:658658ea9323

mod_unified_push: Add ACL option to restrict access It defaults to the current host if on a VirtualHost, or parent host if a component.
author Matthew Wild <mwild1@gmail.com>
date Fri, 13 Jan 2023 16:41:48 +0000
parent 5146:a86022d702b2
child 5148:bf42f1401f1c
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1 local unified_push_secret = assert(module:get_option_string("unified_push_secret"), "required option: unified_push_secret");
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2 local push_registration_ttl = module:get_option_number("unified_push_registration_ttl", 86400);
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3
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4 local base64 = require "util.encodings".base64;
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5 local datetime = require "util.datetime";
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6 local id = require "util.id";
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7 local jwt = require "util.jwt";
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8 local st = require "util.stanza";
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9 local urlencode = require "util.http".urlencode;
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10
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11 local xmlns_up = "http://gultsch.de/xmpp/drafts/unified-push";
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12
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13 module:depends("http");
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14 module:depends("disco");
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15
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16 module:add_feature(xmlns_up);
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17
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18 local acl = module:get_option_set("unified_push_acl", {
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19 module:get_host_type() == "local" and module.host or module.host:match("^[^%.]%.(.+)$")
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20 });
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21
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22 local function is_jid_permitted(user_jid)
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23 for acl_entry in acl do
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24 if jid.compare(user_jid, acl_entry) then
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25 return true;
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26 end
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27 end
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28 return false;
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29 end
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30
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31 local function check_sha256(s)
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32 if not s then return nil, "no value provided"; end
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33 local d = base64.decode(s);
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34 if not d then return nil, "invalid base64"; end
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35 if #d ~= 32 then return nil, "incorrect decoded length, expected 32"; end
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36 return s;
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37 end
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38
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39 -- COMPAT w/0.12
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40 local function jwt_sign(data)
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41 return jwt.sign(unified_push_secret, data);
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42 end
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43
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44 -- COMPAT w/0.12: add expiry check
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45 local function jwt_verify(token)
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46 local ok, result = jwt.verify(unified_push_secret, token);
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47
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48 if not ok then
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49 return ok, result;
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50 end
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51 if result.exp and result.exp < os.time() then
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52 return nil, "token-expired";
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53 end
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54 return ok, result;
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55 end
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56
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57 -- Handle incoming registration from XMPP client
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58 function handle_register(event)
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59 local origin, stanza = event.origin, event.stanza;
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60 if not is_jid_permitted(stanza.attr.from) then
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61 return st.error_reply(stanza, "auth", "forbidden");
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62 end
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63 local instance, instance_err = check_sha256(stanza.tags[1].attr.instance);
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64 if not instance then
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65 return st.error_reply(stanza, "modify", "bad-request", "instance: "..instance_err);
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66 end
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67 local application, application_err = check_sha256(stanza.tags[1].attr.application);
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68 if not application then
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69 return st.error_reply(stanza, "modify", "bad-request", "application: "..application_err);
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70 end
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71 local expiry = os.time() + push_registration_ttl;
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72 local url = module:http_url("push").."/"..urlencode(jwt_sign({
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73 instance = instance;
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74 application = application;
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75 sub = stanza.attr.from;
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76 exp = expiry;
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77 }));
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78 module:log("debug", "New push registration successful");
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79 return origin.send(st.reply(stanza):tag("registered", {
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80 expiration = datetime.datetime(expiry);
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81 endpoint = url;
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82 xmlns = xmlns_up;
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83 }));
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84 end
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85
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86 module:hook("iq-set/host/"..xmlns_up..":register", handle_register);
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87
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88 -- Handle incoming POST
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89 function handle_push(event, subpath)
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90 module:log("debug", "Incoming push received!");
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91 local ok, data = jwt_verify(subpath);
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92 if not ok then
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93 module:log("debug", "Received push to unacceptable token (%s)", data);
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94 return 404;
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95 end
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96 local payload = event.request.body;
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97 if not payload or payload == "" then
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98 module:log("warn", "Missing or empty push payload");
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99 return 400;
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100 elseif #payload > 4096 then
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101 module:log("warn", "Push payload too large");
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102 return 413;
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103 end
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104 local push_id = event.request.id or id.short();
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105 module:log("debug", "Push notification received [%s], relaying to device...", push_id);
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106 local push_iq = st.iq({ type = "set", to = data.sub, from = module.host, id = push_id })
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107 :text_tag("push", base64.encode(payload), { instance = data.instance, application = data.application, xmlns = xmlns_up });
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108 return module:send_iq(push_iq):next(function ()
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109 module:log("debug", "Push notification delivered [%s]", push_id);
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110 return 201;
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111 end, function (error_event)
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112 local e_type, e_cond, e_text = error_event.stanza:get_error();
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113 if e_cond == "item-not-found" or e_cond == "feature-not-implemented" then
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114 module:log("debug", "Push rejected [%s]", push_id);
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115 return 404;
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116 elseif e_cond == "service-unavailable" or e_cond == "recipient-unavailable" then
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117 module:log("debug", "Recipient temporarily unavailable [%s]", push_id);
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118 return 503;
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119 end
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120 module:log("warn", "Unexpected push error response: %s/%s/%s", e_type, e_cond, e_text);
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121 return 500;
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122 end);
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123 end
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124
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125 module:provides("http", {
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126 name = "push";
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127 route = {
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128 ["GET /*"] = function (event)
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129 event.response.headers.content_type = "application/json";
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130 return [[{"unifiedpush":{"version":1}}]];
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131 end;
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
132 ["POST /*"] = handle_push;
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
133 };
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
134 });