prosody
aade4a6179a3
plugins/mod_http_file_share.lua

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plugins/mod_http_file_share.lua @ 11312:aade4a6179a3

mod_http_file_share: Return proper error if unauthorized
author Kim Alvefur <zash@zash.se>
date Tue, 26 Jan 2021 14:51:55 +0100
parent 11311:9edda2026e57
child 11313:e53894d26092
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2021 Kim Alvefur
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7 -- XEP-0363: HTTP File Upload
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8 -- Again, from the top!
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9
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10 local t_insert = table.insert;
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11 local jid = require "util.jid";
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12 local st = require "util.stanza";
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13 local url = require "socket.url";
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14 local dm = require "core.storagemanager".olddm;
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15 local jwt = require "util.jwt";
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16 local errors = require "util.error";
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17
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18 local namespace = "urn:xmpp:http:upload:0";
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19
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20 module:depends("disco");
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21
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22 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload"));
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23 module:add_feature(namespace);
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24
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25 local uploads = module:open_store("uploads", "archive");
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26 -- id, <request>, time, owner
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27
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28 local secret = module:get_option_string(module.name.."_secret", require"util.id".long());
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29 local external_base_url = module:get_option_string(module.name .. "_base_url");
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30
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31 local access = module:get_option_set(module.name .. "_access", {});
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32
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33 if not external_base_url then
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34 module:depends("http");
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35 end
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36
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37 local upload_errors = errors.init(module.name, namespace, {
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38 access = { "auth"; "forbidden" };
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39 });
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40
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41 function may_upload(uploader, filename, filesize, filetype) -- > boolean, error
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42 local uploader_host = jid.host(uploader);
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43 if not ((access:empty() and prosody.hosts[uploader_host]) or access:contains(uploader) or access:contains(uploader_host)) then
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44 return false, upload_errors.new("access");
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45 end
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46
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47 return true;
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48 end
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49
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50 function get_authz(uploader, filename, filesize, filetype, slot)
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51 return "Bearer "..jwt.sign(secret, {
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52 sub = uploader;
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53 filename = filename;
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54 filesize = filesize;
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55 filetype = filetype;
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56 slot = slot;
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57 exp = os.time()+300;
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58 });
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59 end
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60
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61 function get_url(slot, filename)
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62 local base_url = external_base_url or module:http_url();
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63 local slot_url = url.parse(base_url);
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64 slot_url.path = url.parse_path(slot_url.path or "/");
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65 t_insert(slot_url.path, slot);
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66 if filename then
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67 t_insert(slot_url.path, filename);
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68 slot_url.path.is_directory = false;
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69 else
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70 slot_url.path.is_directory = true;
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71 end
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72 slot_url.path = url.build_path(slot_url.path);
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73 return url.build(slot_url);
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74 end
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75
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76 function handle_slot_request(event)
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77 local stanza, origin = event.stanza, event.origin;
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78
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79 local request = st.clone(stanza.tags[1], true);
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80 local filename = request.attr.filename;
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81 local filesize = tonumber(request.attr.size);
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82 local filetype = request.attr["content-type"];
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83 local uploader = jid.bare(stanza.attr.from);
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84
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85 local may, why_not = may_upload(uploader, filename, filesize, filetype);
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86 if not may then
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87 origin.send(st.error_reply(stanza, why_not));
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88 return true;
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89 end
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90
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91 local slot, storage_err = errors.coerce(uploads:append(nil, nil, request, os.time(), uploader))
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92 if not slot then
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93 origin.send(st.error_reply(stanza, storage_err));
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94 return true;
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95 end
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96
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97 local authz = get_authz(uploader, filename, filesize, filetype, slot);
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98 local slot_url = get_url(slot, filename);
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99 local upload_url = slot_url;
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100
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101 local reply = st.reply(stanza)
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102 :tag("slot", { xmlns = namespace })
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103 :tag("get", { url = slot_url }):up()
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104 :tag("put", { url = upload_url })
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105 :text_tag("header", authz, {name="Authorization"})
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106 :reset();
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107
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108 origin.send(reply);
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109 return true;
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110 end
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111
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112 function handle_upload(event, path) -- PUT /upload/:slot
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113 local request = event.request;
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114 local authz = request.headers.authorization;
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115 if not authz or not authz:find"^Bearer ." then
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116 return 403;
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117 end
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118 local authed, upload_info = jwt.verify(secret, authz:match("^Bearer (.*)"));
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119 if not (authed and type(upload_info) == "table" and type(upload_info.exp) == "number") then
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120 return 401;
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121 end
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122 if upload_info.exp < os.time() then
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123 return 410;
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124 end
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125 if not path or upload_info.slot ~= path:match("^[^/]+") then
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126 return 400;
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127 end
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128
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129 local filename = dm.getpath(upload_info.slot, module.host, module.name, nil, true);
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130
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131 if not request.body_sink then
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132 local fh, err = errors.coerce(io.open(filename.."~", "w"));
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133 if not fh then
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134 return err;
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135 end
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136 request.body_sink = fh;
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137 if request.body == false then
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138 return true;
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139 end
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140 end
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141
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142 if request.body then
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143 local written, err = errors.coerce(request.body_sink:write(request.body));
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144 if not written then
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145 return err;
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146 end
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147 request.body = nil;
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148 end
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149
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150 if request.body_sink then
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151 local uploaded, err = errors.coerce(request.body_sink:close());
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152 if uploaded then
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153 assert(os.rename(filename.."~", filename));
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154 return 201;
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155 else
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156 assert(os.remove(filename.."~"));
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157 return err;
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158 end
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159 end
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160
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161 end
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162
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163 function handle_download(event, path) -- GET /uploads/:slot+filename
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164 local request, response = event.request, event.response;
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165 local slot_id = path:match("^[^/]+");
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166 -- TODO cache
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167 local slot, when = errors.coerce(uploads:get(nil, slot_id));
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168 if not slot then
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169 module:log("debug", "uploads:get(%q) --> not-found, %s", slot_id, when);
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170 return 404;
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171 end
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172 module:log("debug", "uploads:get(%q) --> %s, %d", slot_id, slot, when);
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173 local last_modified = os.date('!%a, %d %b %Y %H:%M:%S GMT', when);
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174 if request.headers.if_modified_since == last_modified then
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175 return 304;
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176 end
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177 local filename = dm.getpath(slot_id, module.host, module.name);
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178 local handle, ferr = errors.coerce(io.open(filename));
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179 if not handle then
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180 return ferr or 410;
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181 end
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182 response.headers.last_modified = last_modified;
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183 response.headers.content_length = slot.attr.size;
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184 response.headers.content_type = slot.attr["content-type"];
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185 response.headers.content_disposition = string.format("attachment; filename=%q", slot.attr.filename);
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186
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187 response.headers.cache_control = "max-age=31556952, immutable";
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188 response.headers.content_security_policy = "default-src 'none'; frame-ancestors 'none';"
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189
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190 return response:send_file(handle);
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191 -- TODO
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192 -- Set security headers
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193 end
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194
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195 -- TODO periodic cleanup job
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196
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197 module:hook("iq-get/host/urn:xmpp:http:upload:0:request", handle_slot_request);
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198
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199 if not external_base_url then
11309
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200 module:provides("http", {
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201 streaming_uploads = true;
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202 route = {
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203 ["PUT /*"] = handle_upload;
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204 ["GET /*"] = handle_download;
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205 }
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206 });
11310
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parents: 11309
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207 end