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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 softreq = require"util.dependencies".softreq;
local ssl = softreq"ssl";
if not ssl then
return {
create_context = function ()
return nil, "LuaSec (required for encryption) was not found";
end;
reload_ssl_config = function () end;
}
end
local configmanager = require "core.configmanager";
local log = require "util.logger".init("certmanager");
local ssl_context = ssl.context or softreq"ssl.context";
local ssl_x509 = ssl.x509 or softreq"ssl.x509";
local ssl_newcontext = ssl.newcontext;
local new_config = require"util.sslconfig".new;
local stat = require "lfs".attributes;
local tonumber, tostring = tonumber, tostring;
local pairs = pairs;
local type = type;
local io_open = io.open;
local select = select;
local prosody = prosody;
local resolve_path = require"util.paths".resolve_relative_path;
local config_path = prosody.paths.config or ".";
local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");
local luasec_version = tonumber(luasec_major) * 100 + tonumber(luasec_minor);
local luasec_has = {
-- TODO If LuaSec ever starts exposing these things itself, use that instead
cipher_server_preference = luasec_version >= 2;
no_ticket = luasec_version >= 4;
no_compression = luasec_version >= 5;
single_dh_use = luasec_version >= 2;
single_ecdh_use = luasec_version >= 2;
};
local _ENV = nil;
-- Global SSL options if not overridden per-host
local global_ssl_config = configmanager.get("*", "ssl");
local global_certificates = configmanager.get("*", "certificates") or "certs";
local crt_try = { "", "/%s.crt", "/%s/fullchain.pem", "/%s.pem", };
local key_try = { "", "/%s.key", "/%s/privkey.pem", "/%s.pem", };
local function find_cert(user_certs, name)
local certs = resolve_path(config_path, user_certs or global_certificates);
log("debug", "Searching %s for a key and certificate for %s...", certs, name);
for i = 1, #crt_try do
local crt_path = certs .. crt_try[i]:format(name);
local key_path = certs .. key_try[i]:format(name);
if stat(crt_path, "mode") == "file" then
if key_path:sub(-4) == ".crt" then
key_path = key_path:sub(1, -4) .. "key";
if stat(key_path, "mode") == "file" then
log("debug", "Selecting certificate %s with key %s for %s", crt_path, key_path, name);
return { certificate = crt_path, key = key_path };
end
elseif stat(key_path, "mode") == "file" then
log("debug", "Selecting certificate %s with key %s for %s", crt_path, key_path, name);
return { certificate = crt_path, key = key_path };
end
end
end
log("debug", "No certificate/key found for %s", name);
end
local function find_host_cert(host)
if not host then return nil; end
return find_cert(configmanager.get(host, "certificate"), host) or find_host_cert(host:match("%.(.+)$"));
end
local function find_service_cert(service, port)
local cert_config = configmanager.get("*", service.."_certificate");
if type(cert_config) == "table" then
cert_config = cert_config[port] or cert_config.default;
end
return find_cert(cert_config, service);
end
-- Built-in defaults
local core_defaults = {
capath = "/etc/ssl/certs";
depth = 9;
protocol = "tlsv1+";
verify = (ssl_x509 and { "peer", "client_once", }) or "none";
options = {
cipher_server_preference = luasec_has.cipher_server_preference;
no_ticket = luasec_has.no_ticket;
no_compression = luasec_has.no_compression and configmanager.get("*", "ssl_compression") ~= true;
single_dh_use = luasec_has.single_dh_use;
single_ecdh_use = luasec_has.single_ecdh_use;
};
verifyext = { "lsec_continue", "lsec_ignore_purpose" };
curve = "secp384r1";
ciphers = { -- Enabled ciphers in order of preference:
"HIGH+kEDH", -- Ephemeral Diffie-Hellman key exchange, if a 'dhparam' file is set
"HIGH+kEECDH", -- Ephemeral Elliptic curve Diffie-Hellman key exchange
"HIGH", -- Other "High strength" ciphers
-- Disabled cipher suites:
"!PSK", -- Pre-Shared Key - not used for XMPP
"!SRP", -- Secure Remote Password - not used for XMPP
"!3DES", -- 3DES - slow and of questionable security
"!aNULL", -- Ciphers that does not authenticate the connection
};
}
local path_options = { -- These we pass through resolve_path()
key = true, certificate = true, cafile = true, capath = true, dhparam = true
}
if luasec_version < 5 and ssl_x509 then
-- COMPAT mw/luasec-hg
for i=1,#core_defaults.verifyext do -- Remove lsec_ prefix
core_defaults.verify[#core_defaults.verify+1] = core_defaults.verifyext[i]:sub(6);
end
end
local function create_context(host, mode, ...)
local cfg = new_config();
cfg:apply(core_defaults);
local service_name, port = host:match("^(%w+) port (%d+)$");
if service_name then
cfg:apply(find_service_cert(service_name, tonumber(port)));
else
cfg:apply(find_host_cert(host));
end
cfg:apply({
mode = mode,
-- We can't read the password interactively when daemonized
password = function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;
});
cfg:apply(global_ssl_config);
for i = select('#', ...), 1, -1 do
cfg:apply(select(i, ...));
end
local user_ssl_config = cfg:final();
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
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]);
else
user_ssl_config[option] = nil;
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
local typ;
if file == "private key" then
typ = file;
file = user_ssl_config.key or "your private key";
elseif file == "certificate" then
typ = file;
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 == "no start line" then
reason = "Check that the file contains a "..(typ or file);
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, user_ssl_config;
end
local function reload_ssl_config()
global_ssl_config = configmanager.get("*", "ssl");
global_certificates = configmanager.get("*", "certificates") or "certs";
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 {
create_context = create_context;
reload_ssl_config = reload_ssl_config;
find_cert = find_cert;
};
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