Annotate

mod_pubsub_post/mod_pubsub_post.lua @ 3503:882180b459a0

mod_pubsub_post: Restructure authentication and authorization (BC) This deprecates the default "superuser" actor model and makes the default equivalent to the previous "request.id". A single actor and secret per node is supported because HTTP and WebHooks don't normally include any authorization identity. Allowing authentication bypass when no secret is given should be relatively safe when the actor is unprivileged, as will be unless explicitly configured otherwise.
author Kim Alvefur <zash@zash.se>
date Sat, 30 Mar 2019 21:16:13 +0100
parent 3501:1df139b157fb
child 3504:9ef5b229f73e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 module:depends("http");
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2
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3 local st = require "util.stanza";
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4 local json = require "util.json";
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5 local xml = require "util.xml";
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6 local uuid_generate = require "util.uuid".generate;
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7 local timestamp_generate = require "util.datetime".datetime;
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8 local hashes = require "util.hashes";
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9 local from_hex = require "util.hex".from;
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10 local hmacs = {
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11 sha1 = hashes.hmac_sha1;
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12 sha256 = hashes.hmac_sha256;
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13 sha384 = hashes.hmac_sha384;
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14 sha512 = hashes.hmac_sha512;
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15 };
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16
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17 local pubsub_service = module:depends("pubsub").service;
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18
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19 local error_mapping = {
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20 ["forbidden"] = 403;
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21 ["item-not-found"] = 404;
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22 ["internal-server-error"] = 500;
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23 ["conflict"] = 409;
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24 };
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25
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26 local function publish_payload(node, actor, item_id, payload)
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27 local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
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28 :add_child(payload);
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29 local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
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30 module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
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31 if not ok then
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32 return error_mapping[err] or 500;
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33 end
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34 return 202;
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35 end
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36
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37 local function handle_json(node, actor, data)
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38 local parsed, err = json.decode(data);
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39 if not parsed then
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40 return { status_code = 400; body = tostring(err); }
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41 end
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42 if type(parsed) ~= "table" then
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43 return { status_code = 400; body = "object or array expected"; };
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44 end
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45 local wrapper = st.stanza("json", { xmlns="urn:xmpp:json:0" }):text(data);
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46 return publish_payload(node, actor, data.id or "current", wrapper);
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47 end
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48
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49 local function publish_atom(node, actor, feed)
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50 for entry in feed:childtags("entry") do
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51 local item_id = entry:get_child_text("id");
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52 if not item_id then
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53 item_id = uuid_generate();
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54 entry:tag("id"):text(item_id):up();
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55 end
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56 if not entry:get_child_text("published") then
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57 entry:tag("published"):text(timestamp_generate()):up();
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58 end
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59 local resp = publish_payload(node, actor, item_id, entry);
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60 if resp ~= 202 then return resp; end
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61 end
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62 return 202;
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63 end
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64
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65 local function handle_xml(node, actor, payload)
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66 local xmlpayload, err = xml.parse(payload);
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67 if not xmlpayload then
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68 module:log("debug", "XML parse error: %s\n%q", err, payload);
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69 return { status_code = 400, body = tostring(err) };
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70 end
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71 if xmlpayload.attr.xmlns == "http://www.w3.org/2005/Atom" and xmlpayload.name == "feed" then
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72 return publish_atom(node, actor, xmlpayload);
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73 else
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74 return publish_payload(node, actor, "current", xmlpayload);
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75 end
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76 end
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77
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78 local actor_source = module:get_option_string("pubsub_post_actor"); -- COMPAT
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79 local default_secret = module:get_option_string("pubsub_post_default_secret");
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80 local actor_secrets = module:get_option("pubsub_post_secrets");
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81 local actors = module:get_option("pubsub_post_actors");
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82 local default_actor = module:get_option_string("pubsub_post_default_actor");
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83 if not default_actor and actor_source == "superuser" then
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84 default_actor = true;
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85 end
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86
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87 local function verify_signature(secret, body, signature)
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88 if not signature then return false; end
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89 local algo, digest = signature:match("^([^=]+)=(%x+)");
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90 if not algo then return false; end
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91 local hmac = hmacs[algo];
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92 if not algo then return false; end
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93 return hmac(secret, body) == from_hex(digest);
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94 end
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95
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96 function handle_POST(event, path)
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97 local request = event.request;
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98 module:log("debug", "Handling POST: \n%s\n", tostring(request.body));
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99
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100 local content_type = request.headers.content_type or "application/octet-stream";
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101 local actor = actors and actors[path] or default_actor or request.ip;
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102 local secret = actor_secrets and actor_secrets[path] or default_secret;
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103
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104 if secret and not verify_signature(secret, request.body, request.headers.x_hub_signature) then
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105 return 401;
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106 end
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107
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108 if not actor then
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109 return 401;
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110 end
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111
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112 if content_type == "application/xml" or content_type:sub(-4) == "+xml" then
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113 return handle_xml(path, actor, request.body);
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114 elseif content_type == "application/json" or content_type:sub(-5) == "+json" then
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115 return handle_json(path, actor, request.body);
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116 end
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117
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118 module:log("debug", "Unsupported content-type: %q", content_type);
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119 return 415;
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120 end
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121
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122 module:provides("http", {
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123 route = {
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124 ["POST /*"] = handle_POST;
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125 };
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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126 });
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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127
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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128 function module.load()
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129 module:log("debug", "Loaded at %s", module:http_url());
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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130 end