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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> |
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date | Fri, 13 Jan 2023 16:41:48 +0000 |
parent | 5146:a86022d702b2 |
child | 5148:bf42f1401f1c |
rev | line source |
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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; |
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132 ["POST /*"] = handle_push; |
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133 }; |
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134 }); |