prosody
0.11.12
util/dependencies.lua

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util/dependencies.lua @ 12181:783056b4e448 0.11 0.11.12

util.xml: Do not allow doctypes, comments or processing instructions Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 10 Jan 2022 18:23:54 +0100
parent 11140:e17b98feb0b7
child 11141:a5acd6354845
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1523
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Matthew Wild <mwild1@gmail.com>
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diff changeset
1 -- Prosody IM
2923
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2 -- Copyright (C) 2008-2010 Matthew Wild
b7049746bd29 Update copyright headers for 2010
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
b1885732e979 GPL->MIT!
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6 -- COPYING file in the source package for more information.
519
cccd610a0ef9 Insert copyright/license headers
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7 --
cccd610a0ef9 Insert copyright/license headers
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8
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9 local function softreq(...) local ok, lib = pcall(require, ...); if ok then return lib; else return nil, lib; end end
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10
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11 -- Required to be able to find packages installed with luarocks
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12 if not softreq "luarocks.loader" then -- LuaRocks 2.x
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13 softreq "luarocks.require"; -- LuaRocks <1.x
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14 end
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15
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16 local function missingdep(name, sources, msg)
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17 print("");
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18 print("**************************");
408
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19 print("Prosody was unable to find "..tostring(name));
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20 print("This package can be obtained in the following ways:");
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21 print("");
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22 local longest_platform = 0;
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23 for platform in pairs(sources) do
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24 longest_platform = math.max(longest_platform, #platform);
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25 end
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26 for platform, source in pairs(sources) do
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27 print("", platform..":"..(" "):rep(4+longest_platform-#platform)..source);
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28 end
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29 print("");
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30 print(msg or (name.." is required for Prosody to run, so we will now exit."));
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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31 print("More help can be found on our website, at https://prosody.im/doc/depends");
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32 print("**************************");
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33 print("");
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34 end
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35
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36 local function check_dependencies()
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37 if _VERSION < "Lua 5.1" then
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38 print "***********************************"
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39 print("Unsupported Lua version: ".._VERSION);
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40 print("At least Lua 5.1 is required.");
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41 print "***********************************"
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42 return false;
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43 end
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44
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45 local fatal;
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46
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47 local lxp = softreq "lxp"
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48
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49 if not lxp then
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50 missingdep("luaexpat", {
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51 ["Debian/Ubuntu"] = "sudo apt-get install lua-expat";
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52 ["luarocks"] = "luarocks install luaexpat";
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53 ["Source"] = "http://matthewwild.co.uk/projects/luaexpat/";
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54 });
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55 fatal = true;
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56 end
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57
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58 local socket = softreq "socket"
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59
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60 if not socket then
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61 missingdep("luasocket", {
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62 ["Debian/Ubuntu"] = "sudo apt-get install lua-socket";
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63 ["luarocks"] = "luarocks install luasocket";
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64 ["Source"] = "http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/";
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65 });
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66 fatal = true;
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67 elseif not socket.tcp4 then
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68 -- COMPAT LuaSocket before being IP-version agnostic
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69 socket.tcp4 = socket.tcp;
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70 socket.udp4 = socket.udp;
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71 end
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72
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73 local lfs, err = softreq "lfs"
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74 if not lfs then
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75 missingdep("luafilesystem", {
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76 ["luarocks"] = "luarocks install luafilesystem";
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77 ["Debian/Ubuntu"] = "sudo apt-get install lua-filesystem";
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78 ["Source"] = "http://www.keplerproject.org/luafilesystem/";
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79 });
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80 fatal = true;
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81 end
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82
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83 local ssl = softreq "ssl"
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84
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85 if not ssl then
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86 missingdep("LuaSec", {
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87 ["Debian/Ubuntu"] = "sudo apt-get install lua-sec";
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88 ["luarocks"] = "luarocks install luasec";
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89 ["Source"] = "https://github.com/brunoos/luasec";
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90 }, "SSL/TLS support will not be available");
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91 end
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92
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93 local bit = softreq"bit" or softreq"bit32";
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94
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95 if not bit then
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96 missingdep("lua-bitops", {
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97 ["Debian/Ubuntu"] = "sudo apt-get install lua-bitop";
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98 ["luarocks"] = "luarocks install luabitop";
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99 ["Source"] = "http://bitop.luajit.org/";
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100 }, "WebSocket support will not be available");
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101 end
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102
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103 local encodings, err = softreq "util.encodings"
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104 if not encodings then
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105 if err:match("module '[^']*' not found") then
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106 missingdep("util.encodings", {
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107 ["Windows"] = "Make sure you have encodings.dll from the Prosody distribution in util/";
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108 ["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/encodings.so";
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109 });
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110 else
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parents: 2299
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111 print "***********************************"
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
112 print("util/encodings couldn't be loaded. Check that you have a recent version of libidn");
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
113 print ""
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
114 print("The full error was:");
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
115 print(err)
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
116 print "***********************************"
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
117 end
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
118 fatal = true;
2169
c06fdb6b57bd util.dependencies: Log an error if the current version of LuaSec installed contains The Bug (thanks Remko)
Matthew Wild <mwild1@gmail.com>
parents: 2158
diff changeset
119 end
408
eb1a0960cefb Friendlier messages on missing dependencies
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
120
2510
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
121 local hashes, err = softreq "util.hashes"
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
122 if not hashes then
7264
6d97895c2bd7 util.dependencies: Show the full error when a symbol is not found (i.e., when running Prosody with the wrong version of Lua).
Thijs Alkemade <me@thijsalkema.de>
parents: 7007
diff changeset
123 if err:match("module '[^']*' not found") then
7875
3fbfd7210d78 util.dependencies: Normalize whitespace
Kim Alvefur <zash@zash.se>
parents: 7813
diff changeset
124 missingdep("util.hashes", {
3fbfd7210d78 util.dependencies: Normalize whitespace
Kim Alvefur <zash@zash.se>
parents: 7813
diff changeset
125 ["Windows"] = "Make sure you have hashes.dll from the Prosody distribution in util/";
3fbfd7210d78 util.dependencies: Normalize whitespace
Kim Alvefur <zash@zash.se>
parents: 7813
diff changeset
126 ["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/hashes.so";
3fbfd7210d78 util.dependencies: Normalize whitespace
Kim Alvefur <zash@zash.se>
parents: 7813
diff changeset
127 });
3fbfd7210d78 util.dependencies: Normalize whitespace
Kim Alvefur <zash@zash.se>
parents: 7813
diff changeset
128 else
2510
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
129 print "***********************************"
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
130 print("util/hashes couldn't be loaded. Check that you have a recent version of OpenSSL (libcrypto in particular)");
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
131 print ""
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
132 print("The full error was:");
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
133 print(err)
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
134 print "***********************************"
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
135 end
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
136 fatal = true;
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
137 end
7767
36bf9ed87ae1 util.dependencies: Add check and info about lua-bitops (for mod_websockets)
Kim Alvefur <zash@zash.se>
parents: 7766
diff changeset
138
2510
97b5ea975cb9 util.dependencies, prosody, prosodyctl: Give util.dependencies a check_dependencies() function so the caller can decide what to do when dependencies aren't met - update prosody/prosodyctl for this change
Matthew Wild <mwild1@gmail.com>
parents: 2299
diff changeset
139 return not fatal;
408
eb1a0960cefb Friendlier messages on missing dependencies
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 end
eb1a0960cefb Friendlier messages on missing dependencies
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
142 local function log_warnings()
7721
92f771147de8 util.dependencies: Disable warning about Lua 5.2 (but still warn about 5.3)
Kim Alvefur <zash@zash.se>
parents: 7679
diff changeset
143 if _VERSION > "Lua 5.2" then
7007
e28fbe6dd424 util.dependencies: Use prosody.log() instead of global log()
Matthew Wild <mwild1@gmail.com>
parents: 6778
diff changeset
144 prosody.log("warn", "Support for %s is experimental, please report any issues", _VERSION);
6778
4009ae66e0f0 util.dependencies: Only abort on Lua versions before 5.1, log a warning about 5.2 and above for now
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
145 end
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
146 local ssl = softreq"ssl";
3904
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
147 if ssl then
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
148 local major, minor, veryminor, patched = ssl._VERSION:match("(%d+)%.(%d+)%.?(%d*)(M?)");
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
149 if not major or ((tonumber(major) == 0 and (tonumber(minor) or 0) <= 3 and (tonumber(veryminor) or 0) <= 2) and patched ~= "M") then
7359
a5a080c12c96 Update every link to the documentation to use HTTPS
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 7264
diff changeset
150 prosody.log("error", "This version of LuaSec contains a known bug that causes disconnects, see https://prosody.im/doc/depends");
3904
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
151 end
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
152 end
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
153 local lxp = softreq"lxp";
4426
ee65aa40ef60 util.dependencies, util.xmppstream: Move LuaExpat version checking to util.dependencies.
Waqas Hussain <waqas20@gmail.com>
parents: 4236
diff changeset
154 if lxp then
ee65aa40ef60 util.dependencies, util.xmppstream: Move LuaExpat version checking to util.dependencies.
Waqas Hussain <waqas20@gmail.com>
parents: 4236
diff changeset
155 if not pcall(lxp.new, { StartDoctypeDecl = false }) then
7007
e28fbe6dd424 util.dependencies: Use prosody.log() instead of global log()
Matthew Wild <mwild1@gmail.com>
parents: 6778
diff changeset
156 prosody.log("error", "The version of LuaExpat on your system leaves Prosody "
4426
ee65aa40ef60 util.dependencies, util.xmppstream: Move LuaExpat version checking to util.dependencies.
Waqas Hussain <waqas20@gmail.com>
parents: 4236
diff changeset
157 .."vulnerable to denial-of-service attacks. You should upgrade to "
6043
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
158 .."LuaExpat 1.3.0 or higher as soon as possible. See "
7359
a5a080c12c96 Update every link to the documentation to use HTTPS
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 7264
diff changeset
159 .."https://prosody.im/doc/depends#luaexpat for more information.");
6043
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
160 end
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
161 if not lxp.new({}).getcurrentbytecount then
7007
e28fbe6dd424 util.dependencies: Use prosody.log() instead of global log()
Matthew Wild <mwild1@gmail.com>
parents: 6778
diff changeset
162 prosody.log("error", "The version of LuaExpat on your system does not support "
6043
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
163 .."stanza size limits, which may leave servers on untrusted "
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
164 .."networks (e.g. the internet) vulnerable to denial-of-service "
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
165 .."attacks. You should upgrade to LuaExpat 1.3.0 or higher as "
29d2dd705148 util.dependencies: Log error when LuaExpat is not capable of enforcing stanza size limits
Matthew Wild <mwild1@gmail.com>
parents: 4426
diff changeset
166 .."soon as possible. See "
7359
a5a080c12c96 Update every link to the documentation to use HTTPS
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 7264
diff changeset
167 .."https://prosody.im/doc/depends#luaexpat for more information.");
4426
ee65aa40ef60 util.dependencies, util.xmppstream: Move LuaExpat version checking to util.dependencies.
Waqas Hussain <waqas20@gmail.com>
parents: 4236
diff changeset
168 end
ee65aa40ef60 util.dependencies, util.xmppstream: Move LuaExpat version checking to util.dependencies.
Waqas Hussain <waqas20@gmail.com>
parents: 4236
diff changeset
169 end
3904
f93163081b3c prosody, prosodyctl, util.dependencies: Split checking and logging of dependencies so we can check hard deps before the config and logging is loaded
Matthew Wild <mwild1@gmail.com>
parents: 2925
diff changeset
170 end
742
b9f59372eb4e util.dependencies: Show useful messages when our own libraries are not found, too
Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
171
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
172 return {
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
173 softreq = softreq;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
174 missingdep = missingdep;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
175 check_dependencies = check_dependencies;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
176 log_warnings = log_warnings;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6067
diff changeset
177 };