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mod_http_upload_external/mod_http_upload_external.lua @ 4868:57311c545013
mod_http_xep227: Fix validation of resulting export XML
author | Matthew Wild <mwild1@gmail.com> |
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date | Sat, 15 Jan 2022 14:06:19 +0000 |
parent | 4509:16995e7624f0 |
rev | line source |
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1 -- mod_http_upload_external |
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2 -- |
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3 -- Copyright (C) 2015-2016 Kim Alvefur |
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4 -- |
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5 -- This file is MIT/X11 licensed. |
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6 -- |
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7 |
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8 -- imports |
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9 local st = require"util.stanza"; |
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10 local uuid = require"util.uuid".generate; |
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11 local http = require "util.http"; |
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12 local dataform = require "util.dataforms".new; |
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13 local HMAC = require "util.hashes".hmac_sha256; |
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14 local jid = require "util.jid"; |
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15 |
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16 -- config |
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17 local file_size_limit = module:get_option_number(module.name .. "_file_size_limit", 100 * 1024 * 1024); -- 100 MB |
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18 local base_url = assert(module:get_option_string(module.name .. "_base_url"), |
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19 module.name .. "_base_url is a required option"); |
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20 local secret = assert(module:get_option_string(module.name .. "_secret"), |
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21 module.name .. "_secret is a required option"); |
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22 local access = module:get_option_set(module.name .. "_access", {}); |
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23 |
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24 local token_protocol = module:get_option_string(module.name .. "_protocol", "v1"); |
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25 |
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26 -- depends |
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27 module:depends("disco"); |
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28 |
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29 -- namespace |
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30 local legacy_namespace = "urn:xmpp:http:upload"; |
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31 local namespace = "urn:xmpp:http:upload:0"; |
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32 |
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33 -- identity and feature advertising |
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34 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload")) |
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35 module:add_feature(namespace); |
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36 module:add_feature(legacy_namespace); |
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37 |
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38 module:add_extension(dataform { |
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39 { name = "FORM_TYPE", type = "hidden", value = namespace }, |
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40 { name = "max-file-size", type = "text-single" }, |
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41 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result")); |
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42 |
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43 module:add_extension(dataform { |
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44 { name = "FORM_TYPE", type = "hidden", value = legacy_namespace }, |
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45 { name = "max-file-size", type = "text-single" }, |
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46 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result")); |
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47 |
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48 local function magic_crypto_dust(random, filename, filesize, filetype) |
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49 local param, message; |
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50 if token_protocol == "v1" then |
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51 param, message = "v", string.format("%s/%s %d", random, filename, filesize); |
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52 else |
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53 param, message = "v2", string.format("%s/%s\0%d\0%s", random, filename, filesize, filetype); |
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54 end |
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55 local digest = HMAC(secret, message, true); |
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56 random, filename = http.urlencode(random), http.urlencode(filename); |
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57 return base_url .. random .. "/" .. filename, "?"..param.."=" .. digest; |
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58 end |
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59 |
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60 local function handle_request(origin, stanza, xmlns, filename, filesize, filetype) |
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61 local user_bare = jid.bare(stanza.attr.from); |
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62 local user_host = jid.host(user_bare); |
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63 |
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64 -- local clients or whitelisted jids/hosts only |
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65 if not (origin.type == "c2s" or access:contains(user_bare) or access:contains(user_host)) then |
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66 module:log("debug", "Request for upload slot from a %s", origin.type); |
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67 origin.send(st.error_reply(stanza, "cancel", "not-authorized")); |
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68 return nil, nil; |
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69 end |
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70 -- validate |
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71 if not filename or filename:find("/") then |
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72 module:log("debug", "Filename %q not allowed", filename or ""); |
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73 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename")); |
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74 return nil, nil; |
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75 end |
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76 if not filesize then |
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77 module:log("debug", "Missing file size"); |
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78 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size")); |
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79 return nil, nil; |
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80 elseif filesize > file_size_limit then |
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81 module:log("debug", "File too large (%d > %d)", filesize, file_size_limit); |
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82 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large", |
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83 st.stanza("file-too-large", {xmlns=xmlns}) |
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84 :tag("max-size"):text(tostring(file_size_limit)))); |
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85 return nil, nil; |
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86 end |
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87 local random = uuid(); |
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88 local get_url, verify = magic_crypto_dust(random, filename, filesize, filetype); |
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89 local put_url = get_url .. verify; |
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90 |
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91 module:log("debug", "Handing out upload slot %s to %s@%s [%d %s]", get_url, origin.username, origin.host, filesize, filetype); |
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92 |
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93 return get_url, put_url; |
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94 end |
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95 |
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96 -- hooks |
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97 module:hook("iq/host/"..legacy_namespace..":request", function (event) |
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98 local stanza, origin = event.stanza, event.origin; |
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99 local request = stanza.tags[1]; |
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100 local filename = request:get_child_text("filename"); |
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101 local filesize = tonumber(request:get_child_text("size")); |
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102 local filetype = request:get_child_text("content-type") or "application/octet-stream"; |
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103 |
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104 local get_url, put_url = handle_request( |
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105 origin, stanza, legacy_namespace, filename, filesize, filetype); |
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106 |
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107 if not get_url then |
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108 -- error was already sent |
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109 return true; |
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110 end |
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111 |
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112 local reply = st.reply(stanza) |
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113 :tag("slot", { xmlns = legacy_namespace }) |
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114 :tag("get"):text(get_url):up() |
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115 :tag("put"):text(put_url):up() |
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116 :up(); |
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117 origin.send(reply); |
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118 return true; |
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119 end); |
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120 |
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121 module:hook("iq/host/"..namespace..":request", function (event) |
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122 local stanza, origin = event.stanza, event.origin; |
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123 local request = stanza.tags[1]; |
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124 local filename = request.attr.filename; |
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125 local filesize = tonumber(request.attr.size); |
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126 local filetype = request.attr["content-type"] or "application/octet-stream"; |
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127 |
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128 local get_url, put_url = handle_request( |
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129 origin, stanza, namespace, filename, filesize, filetype); |
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130 |
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131 if not get_url then |
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132 -- error was already sent |
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133 return true; |
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134 end |
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135 |
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136 local reply = st.reply(stanza) |
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137 :tag("slot", { xmlns = namespace}) |
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138 :tag("get", { url = get_url }):up() |
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139 :tag("put", { url = put_url }):up() |
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140 :up(); |
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141 origin.send(reply); |
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142 return true; |
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143 end); |