Software /
code /
prosody
File
util/dependencies.lua @ 11749:83d6d6a70edf
net.http: fail open if surrounding code does not configure TLS
Previously, if surrounding code was not configuring the TLS context
used default in net.http, it would not validate certificates at all.
This is not a security issue with prosody, because prosody updates the
context with `verify = "peer"` as well as paths to CA certificates in
util.startup.init_http_client.
Nevertheless... Let's not leave this pitfall out there in the open.
author | Jonas Schäfer <jonas@wielicki.name> |
---|---|
date | Sun, 29 Aug 2021 15:04:47 +0200 |
parent | 11141:a5acd6354845 |
child | 11958:31f83a645ce6 |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local function softreq(...) local ok, lib = pcall(require, ...); if ok then return lib; else return nil, lib; end end local platform_table = require "util.human.io".table({ { width = 15, align = "right" }, { width = "100%" } }); -- Required to be able to find packages installed with luarocks if not softreq "luarocks.loader" then -- LuaRocks 2.x softreq "luarocks.require"; -- LuaRocks <1.x end local function missingdep(name, sources, msg, err) -- luacheck: ignore err -- TODO print something about the underlying error, useful for debugging print(""); print("**************************"); print("Prosody was unable to find "..tostring(name)); print("This package can be obtained in the following ways:"); print(""); for _, row in ipairs(sources) do print(platform_table(row)); end print(""); print(msg or (name.." is required for Prosody to run, so we will now exit.")); print("More help can be found on our website, at https://prosody.im/doc/depends"); print("**************************"); print(""); end local function check_dependencies() if _VERSION < "Lua 5.1" then print "***********************************" print("Unsupported Lua version: ".._VERSION); print("At least Lua 5.1 is required."); print "***********************************" return false; end local fatal; local lxp, err = softreq "lxp" if not lxp then missingdep("luaexpat", { { "Debian/Ubuntu", "sudo apt-get install lua-expat" }; { "luarocks", "luarocks install luaexpat" }; { "Source", "http://matthewwild.co.uk/projects/luaexpat/" }; }, nil, err); fatal = true; end local socket, err = softreq "socket" if not socket then missingdep("luasocket", { { "Debian/Ubuntu", "sudo apt-get install lua-socket" }; { "luarocks", "luarocks install luasocket" }; { "Source", "http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/" }; }, nil, err); fatal = true; elseif not socket.tcp4 then -- COMPAT LuaSocket before being IP-version agnostic socket.tcp4 = socket.tcp; socket.udp4 = socket.udp; end local lfs, err = softreq "lfs" if not lfs then missingdep("luafilesystem", { { "luarocks", "luarocks install luafilesystem" }; { "Debian/Ubuntu", "sudo apt-get install lua-filesystem" }; { "Source", "http://www.keplerproject.org/luafilesystem/" }; }, nil, err); fatal = true; end local ssl, err = softreq "ssl" if not ssl then missingdep("LuaSec", { { "Debian/Ubuntu", "sudo apt-get install lua-sec" }; { "luarocks", "luarocks install luasec" }; { "Source", "https://github.com/brunoos/luasec" }; }, "SSL/TLS support will not be available", err); end local bit, err = softreq"util.bitcompat"; if not bit then missingdep("lua-bitops", { { "Debian/Ubuntu", "sudo apt-get install lua-bitop" }; { "luarocks", "luarocks install luabitop" }; { "Source", "http://bitop.luajit.org/" }; }, "WebSocket support will not be available", err); end local unbound, err = softreq"lunbound"; -- luacheck: ignore 211/err if not unbound then -- luacheck: ignore 542 --[[ TODO Re-enable once packages are available missingdep("lua-unbound", { { "luarocks", "luarocks install luaunbound" }; { "Source", "https://www.zash.se/luaunbound.html" }; }, "Old DNS resolver library will be used", err); --]] else package.preload["net.adns"] = function () local ub = require "net.unbound"; return ub; end end local encodings, err = softreq "util.encodings" if not encodings then if err:match("module '[^']*' not found") then missingdep("util.encodings", { { "Windows", "Make sure you have encodings.dll from the Prosody distribution in util/" }; { "GNU/Linux", "Run './configure' and 'make' in the Prosody source directory to build util/encodings.so" }; }); else print "***********************************" print("util/encodings couldn't be loaded. Check that you have a recent version of libidn"); print "" print("The full error was:"); print(err) print "***********************************" end fatal = true; end local hashes, err = softreq "util.hashes" if not hashes then if err:match("module '[^']*' not found") then missingdep("util.hashes", { { "Windows", "Make sure you have hashes.dll from the Prosody distribution in util/" }; { "GNU/Linux", "Run './configure' and 'make' in the Prosody source directory to build util/hashes.so" }; }); else print "***********************************" print("util/hashes couldn't be loaded. Check that you have a recent version of OpenSSL (libcrypto in particular)"); print "" print("The full error was:"); print(err) print "***********************************" end fatal = true; end return not fatal; end local function log_warnings() if _VERSION > "Lua 5.3" then prosody.log("warn", "Support for %s is experimental, please report any issues", _VERSION); end local ssl = softreq"ssl"; if ssl then local major, minor, veryminor, patched = ssl._VERSION:match("(%d+)%.(%d+)%.?(%d*)(M?)"); if not major or ((tonumber(major) == 0 and (tonumber(minor) or 0) <= 3 and (tonumber(veryminor) or 0) <= 2) and patched ~= "M") then prosody.log("error", "This version of LuaSec contains a known bug that causes disconnects, see https://prosody.im/doc/depends"); end end local lxp = softreq"lxp"; if lxp then if not pcall(lxp.new, { StartDoctypeDecl = false }) then prosody.log("error", "The version of LuaExpat on your system leaves Prosody " .."vulnerable to denial-of-service attacks. You should upgrade to " .."LuaExpat 1.3.0 or higher as soon as possible. See " .."https://prosody.im/doc/depends#luaexpat for more information."); end if not lxp.new({}).getcurrentbytecount then prosody.log("error", "The version of LuaExpat on your system does not support " .."stanza size limits, which may leave servers on untrusted " .."networks (e.g. the internet) vulnerable to denial-of-service " .."attacks. You should upgrade to LuaExpat 1.3.0 or higher as " .."soon as possible. See " .."https://prosody.im/doc/depends#luaexpat for more information."); end end end return { softreq = softreq; missingdep = missingdep; check_dependencies = check_dependencies; log_warnings = log_warnings; };