Mercurial > prosody-modules

annotate mod_http_upload_external/mod_http_upload_external.lua @ 5401:c8d04ac200fc

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mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents 16995e7624f0
children
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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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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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24 local token_protocol = module:get_option_string(module.name .. "_protocol", "v1");
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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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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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parents:
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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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Matthew Wild <mwild1@gmail.com>
parents: 2939
diff changeset
126 local filetype = request.attr["content-type"] or "application/octet-stream";
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parents: 2939
diff changeset
127
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128 local get_url, put_url = handle_request(
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diff changeset
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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diff changeset
135
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diff changeset
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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diff changeset
140 :up();
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diff changeset
141 origin.send(reply);
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142 return true;
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143 end);