net.server_epoll: Add support for systemd socket activation
Allows creating listening sockets and accepting client connections
before Prosody starts.
This is unlike normal Prosody dynamic resource management, where ports
may added and removed at any time, and the ports defined by the config.
Weird things happen if these are closed (e.g. due to reload) so here we
prevent closing and ensure sockets are reused when opened again.
local crypto = require "prosody.util.crypto";
local json = require "prosody.util.json";
local hashes = require "prosody.util.hashes";
local base64_encode = require "prosody.util.encodings".base64.encode;
local base64_decode = require "prosody.util.encodings".base64.decode;
local secure_equals = require "prosody.util.hashes".equals;
local bit = require "prosody.util.bitcompat";
local hex = require "prosody.util.hex";
local rand = require "prosody.util.random";
local s_pack = require "prosody.util.struct".pack;
local s_gsub = string.gsub;
local v4_public = {};
local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
local function b64url(data)
return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
end
local valid_tails = {
nil; -- Always invalid
"^.[AQgw]$"; -- b??????00
"^..[AQgwEUk0IYo4Mcs8]$"; -- b????0000
}
local function unb64url(data)
local rem = #data%4;
if data:sub(-1,-1) == "=" or rem == 1 or (rem > 1 and not data:sub(-rem):match(valid_tails[rem])) then
return nil;
end
return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
end
local function le64(n)
return s_pack("<I8", bit.band(n, 0x7F));
end
local function pae(parts)
if type(parts) ~= "table" then
error("bad argument #1 to 'pae' (table expected, got "..type(parts)..")");
end
local o = { le64(#parts) };
for _, part in ipairs(parts) do
table.insert(o, le64(#part)..part);
end
return table.concat(o);
end
function v4_public.sign(m, sk, f, i)
if type(m) ~= "table" then
return nil, "PASETO payloads must be a table";
end
m = json.encode(m);
local h = "v4.public.";
local m2 = pae({ h, m, f or "", i or "" });
local sig = crypto.ed25519_sign(sk, m2);
if not f or f == "" then
return h..b64url(m..sig);
else
return h..b64url(m..sig).."."..b64url(f);
end
end
function v4_public.verify(tok, pk, expected_f, i)
local h, sm, f = tok:match("^(v4%.public%.)([^%.]+)%.?(.*)$");
if not h then
return nil, "invalid-token-format";
end
f = f and unb64url(f) or nil;
if expected_f then
if not f or not secure_equals(expected_f, f) then
return nil, "invalid-footer";
end
end
local raw_sm = unb64url(sm);
if not raw_sm or #raw_sm <= 64 then
return nil, "invalid-token-format";
end
local s, m = raw_sm:sub(-64), raw_sm:sub(1, -65);
local m2 = pae({ h, m, f or "", i or "" });
local ok = crypto.ed25519_verify(pk, m2, s);
if not ok then
return nil, "invalid-token";
end
local payload, err = json.decode(m);
if err ~= nil or type(payload) ~= "table" then
return nil, "json-decode-error";
end
return payload;
end
v4_public.import_private_key = crypto.import_private_pem;
v4_public.import_public_key = crypto.import_public_pem;
function v4_public.new_keypair()
return crypto.generate_ed25519_keypair();
end
function v4_public.init(private_key_pem, public_key_pem, options)
local sign, verify = v4_public.sign, v4_public.verify;
local public_key = public_key_pem and v4_public.import_public_key(public_key_pem);
local private_key = private_key_pem and v4_public.import_private_key(private_key_pem);
local default_footer = options and options.default_footer;
local default_assertion = options and options.default_implicit_assertion;
return private_key and function (token, token_footer, token_assertion)
return sign(token, private_key, token_footer or default_footer, token_assertion or default_assertion);
end, public_key and function (token, expected_footer, token_assertion)
return verify(token, public_key, expected_footer or default_footer, token_assertion or default_assertion);
end;
end
function v4_public.new_signer(private_key_pem, options)
return (v4_public.init(private_key_pem, nil, options));
end
function v4_public.new_verifier(public_key_pem, options)
return (select(2, v4_public.init(nil, public_key_pem, options)));
end
local v3_local = { _key_mt = {} };
local function v3_local_derive_keys(k, n)
local tmp = hashes.hkdf_hmac_sha384(48, k, nil, "paseto-encryption-key"..n);
local Ek = tmp:sub(1, 32);
local n2 = tmp:sub(33);
local Ak = hashes.hkdf_hmac_sha384(48, k, nil, "paseto-auth-key-for-aead"..n);
return Ek, Ak, n2;
end
function v3_local.encrypt(m, k, f, i)
assert(#k == 32)
if type(m) ~= "table" then
return nil, "PASETO payloads must be a table";
end
m = json.encode(m);
local h = "v3.local.";
local n = rand.bytes(32);
local Ek, Ak, n2 = v3_local_derive_keys(k, n);
local c = crypto.aes_256_ctr_encrypt(Ek, n2, m);
local m2 = pae({ h, n, c, f or "", i or "" });
local t = hashes.hmac_sha384(Ak, m2);
if not f or f == "" then
return h..b64url(n..c..t);
else
return h..b64url(n..c..t).."."..b64url(f);
end
end
function v3_local.decrypt(tok, k, expected_f, i)
assert(#k == 32)
local h, sm, f = tok:match("^(v3%.local%.)([^%.]+)%.?(.*)$");
if not h then
return nil, "invalid-token-format";
end
f = f and unb64url(f) or nil;
if expected_f then
if not f or not secure_equals(expected_f, f) then
return nil, "invalid-footer";
end
end
local m = unb64url(sm);
if not m or #m <= 80 then
return nil, "invalid-token-format";
end
local n, c, t = m:sub(1, 32), m:sub(33, -49), m:sub(-48);
local Ek, Ak, n2 = v3_local_derive_keys(k, n);
local preAuth = pae({ h, n, c, f or "", i or "" });
local t2 = hashes.hmac_sha384(Ak, preAuth);
if not secure_equals(t, t2) then
return nil, "invalid-token";
end
local m2 = crypto.aes_256_ctr_decrypt(Ek, n2, c);
if not m2 then
return nil, "invalid-token";
end
local payload, err = json.decode(m2);
if err ~= nil or type(payload) ~= "table" then
return nil, "json-decode-error";
end
return payload;
end
function v3_local.new_key()
return "secret-token:paseto.v3.local:"..hex.encode(rand.bytes(32));
end
function v3_local.init(key, options)
local encoded_key = key:match("^secret%-token:paseto%.v3%.local:(%x+)$");
if not encoded_key or #encoded_key ~= 64 then
return error("invalid key for v3.local");
end
local raw_key = hex.decode(encoded_key);
local default_footer = options and options.default_footer;
local default_assertion = options and options.default_implicit_assertion;
return function (token, token_footer, token_assertion)
return v3_local.encrypt(token, raw_key, token_footer or default_footer, token_assertion or default_assertion);
end, function (token, token_footer, token_assertion)
return v3_local.decrypt(token, raw_key, token_footer or default_footer, token_assertion or default_assertion);
end;
end
function v3_local.new_signer(key, options)
return (v3_local.init(key, options));
end
function v3_local.new_verifier(key, options)
return (select(2, v3_local.init(key, options)));
end
return {
pae = pae;
v3_local = v3_local;
v4_public = v4_public;
};