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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 configmanager = require "core.configmanager";
local log = require "util.logger".init("certmanager");
local ssl = ssl;
local ssl_newcontext = ssl and ssl.newcontext;
local tostring = tostring;
local pairs = pairs;
local type = type;
local io_open = io.open;
local t_concat = table.concat;
local prosody = prosody;
local resolve_path = configmanager.resolve_relative_path;
local config_path = prosody.paths.config;
local luasec_has_noticket, luasec_has_verifyext, luasec_has_no_compression;
if ssl then
local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");
luasec_has_noticket = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=4;
luasec_has_verifyext = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
luasec_has_no_compression = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
end
module "certmanager"
-- Global SSL options if not overridden per-host
local global_ssl_config = configmanager.get("*", "ssl");
-- Built-in defaults
local core_defaults = {
capath = "/etc/ssl/certs";
protocol = "tlsv1+";
verify = (ssl and ssl.x509 and { "peer", "client_once", }) or "none";
options = {
cipher_server_preference = true;
no_ticket = luasec_has_noticket;
no_compression = luasec_has_no_compression and configmanager.get("*", "ssl_compression") ~= true;
-- Has no_compression? Then it has these too...
single_dh_use = luasec_has_no_compression;
single_ecdh_use = luasec_has_no_compression;
};
verifyext = { "lsec_continue", "lsec_ignore_purpose" };
curve = "secp384r1";
ciphers = "HIGH+kEDH:HIGH+kEECDH:HIGH:!PSK:!SRP:!3DES:!aNULL";
}
local path_options = { -- These we pass through resolve_path()
key = true, certificate = true, cafile = true, capath = true, dhparam = true
}
local set_options = {
options = true, verify = true, verifyext = true
}
if ssl and not luasec_has_verifyext and ssl.x509 then
-- COMPAT mw/luasec-hg
for i=1,#core_defaults.verifyext do -- Remove lsec_ prefix
core_defaults.verify[#core_defaults.verify+1] = core_defaults.verifyext[i]:sub(6);
end
end
local function merge_set(t, o)
if type(t) ~= "table" then t = { t } end
for k,v in pairs(t) do
if v == true or v == false then
o[k] = v;
else
o[v] = true;
end
end
return o;
end
local protocols = { "sslv2", "sslv3", "tlsv1", "tlsv1_1", "tlsv1_2" };
for i = 1, #protocols do protocols[protocols[i] .. "+"] = i - 1; end
function create_context(host, mode, user_ssl_config)
user_ssl_config = user_ssl_config or {}
user_ssl_config.mode = mode;
if not ssl then return nil, "LuaSec (required for encryption) was not found"; end
if global_ssl_config then
for option,default_value in pairs(global_ssl_config) do
if user_ssl_config[option] == nil then
user_ssl_config[option] = default_value;
end
end
end
for option,default_value in pairs(core_defaults) do
if user_ssl_config[option] == nil then
user_ssl_config[option] = default_value;
end
end
local min_protocol = protocols[user_ssl_config.protocol];
if min_protocol then
user_ssl_config.protocol = "sslv23";
for i = min_protocol, 1, -1 do
user_ssl_config.options["no_"..protocols[i]] = true;
end
end
for option in pairs(set_options) do
local merged = {};
merge_set(core_defaults[option], merged);
merge_set(global_ssl_config[option], merged);
merge_set(user_ssl_config[option], merged);
local final_array = {};
for opt, enable in pairs(merged) do
if enable then
final_array[#final_array+1] = opt;
end
end
user_ssl_config[option] = final_array;
end
-- We can't read the password interactively when daemonized
user_ssl_config.password = user_ssl_config.password or
function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;
for option in pairs(path_options) do
if type(user_ssl_config[option]) == "string" then
user_ssl_config[option] = resolve_path(config_path, user_ssl_config[option]);
end
end
-- Allow the cipher list to be a table
if type(user_ssl_config.ciphers) == "table" then
user_ssl_config.ciphers = t_concat(user_ssl_config.ciphers, ":")
end
if mode == "server" then
if not user_ssl_config.key then return nil, "No key present in SSL/TLS configuration for "..host; end
if not user_ssl_config.certificate then return nil, "No certificate present in SSL/TLS configuration for "..host; end
end
-- LuaSec expects dhparam to be a callback that takes two arguments.
-- We ignore those because it is mostly used for having a separate
-- set of params for EXPORT ciphers, which we don't have by default.
if type(user_ssl_config.dhparam) == "string" then
local f, err = io_open(user_ssl_config.dhparam);
if not f then return nil, "Could not open DH parameters: "..err end
local dhparam = f:read("*a");
f:close();
user_ssl_config.dhparam = function() return dhparam; end
end
local ctx, err = ssl_newcontext(user_ssl_config);
-- COMPAT Older LuaSec ignores the cipher list from the config, so we have to take care
-- of it ourselves (W/A for #x)
if ctx and user_ssl_config.ciphers then
local success;
success, err = ssl.context.setcipher(ctx, user_ssl_config.ciphers);
if not success then ctx = nil; end
end
if not ctx then
err = err or "invalid ssl config"
local file = err:match("^error loading (.-) %(");
if file then
if file == "private key" then
file = user_ssl_config.key or "your private key";
elseif file == "certificate" then
file = user_ssl_config.certificate or "your certificate file";
end
local reason = err:match("%((.+)%)$") or "some reason";
if reason == "Permission denied" then
reason = "Check that the permissions allow Prosody to read this file.";
elseif reason == "No such file or directory" then
reason = "Check that the path is correct, and the file exists.";
elseif reason == "system lib" then
reason = "Previous error (see logs), or other system error.";
elseif reason == "(null)" or not reason then
reason = "Check that the file exists and the permissions are correct";
else
reason = "Reason: "..tostring(reason):lower();
end
log("error", "SSL/TLS: Failed to load '%s': %s (for %s)", file, reason, host);
else
log("error", "SSL/TLS: Error initialising for %s: %s", host, err);
end
end
return ctx, err;
end
function reload_ssl_config()
global_ssl_config = configmanager.get("*", "ssl");
if luasec_has_no_compression then
core_defaults.options.no_compression = configmanager.get("*", "ssl_compression") ~= true;
end
end
prosody.events.add_handler("config-reloaded", reload_ssl_config);
return _M;
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