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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 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");
local core_defaults = {
capath = "/etc/ssl/certs";
protocol = "sslv23";
verify = (ssl and ssl.x509 and { "peer", "client_once", }) or "none";
options = { "no_sslv2", luasec_has_noticket and "no_ticket" or nil };
verifyext = { "lsec_continue", "lsec_ignore_purpose" };
curve = "secp384r1";
ciphers = "HIGH:!DSS:!aNULL@STRENGTH";
}
local path_options = { -- These we pass through resolve_path()
key = true, certificate = true, cafile = true, capath = true, dhparam = 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
if luasec_has_no_compression and configmanager.get("*", "ssl_compression") ~= true then
core_defaults.options[#core_defaults.options+1] = "no_compression";
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 not user_ssl_config[option] then
user_ssl_config[option] = default_value;
end
end
end
for option,default_value in pairs(core_defaults) do
if not user_ssl_config[option] then
user_ssl_config[option] = default_value;
end
end
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
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
-- 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");
end
prosody.events.add_handler("config-reloaded", reload_ssl_config);
return _M;
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