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nghttpx: Generate new ticket key every 1hr and its life time is now 12hrs

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This commit is contained in:
Tatsuhiro Tsujikawa 2015-07-23 21:09:16 +09:00
parent aa012f7a58
commit cd2c751f82
1 changed files with 71 additions and 33 deletions
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104
src/shrpx.cc
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@ -604,54 +604,91 @@ void graceful_shutdown_signal_cb(struct ev_loop *loop, ev_signal *w,
}
} // namespace
namespace {
int generate_ticket_key(TicketKey &ticket_key) {
ticket_key.cipher = get_config()->tls_ticket_cipher;
ticket_key.hmac = EVP_sha256();
ticket_key.hmac_keylen = EVP_MD_size(ticket_key.hmac);
assert(static_cast<size_t>(EVP_CIPHER_key_length(ticket_key.cipher)) <=
sizeof(ticket_key.data.enc_key));
assert(ticket_key.hmac_keylen <= sizeof(ticket_key.data.hmac_key));
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "enc_keylen=" << EVP_CIPHER_key_length(ticket_key.cipher)
<< ", hmac_keylen=" << ticket_key.hmac_keylen;
}
if (RAND_bytes(reinterpret_cast<unsigned char *>(&ticket_key.data),
sizeof(ticket_key.data)) == 0) {
return -1;
}
return 0;
}
} // namespace
namespace {
void renew_ticket_key_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn_handler = static_cast<ConnectionHandler *>(w->data);
const auto &old_ticket_keys = conn_handler->get_ticket_keys();
auto ticket_keys = std::make_shared<TicketKeys>();
LOG(NOTICE) << "Renew ticket keys: main";
LOG(NOTICE) << "Renew new ticket keys";
// We store at most 2 ticket keys
// If old_ticket_keys is not empty, it should contain at least 2
// keys: one for encryption, and last one for the next encryption
// key but decryption only. The keys in between are old keys and
// decryption only. The next key is provided to ensure to mitigate
// possible problem when one worker encrypt new key, but one worker,
// which did not take the that key yet, and cannot decrypt it.
//
// We keep keys for 12 hours. Thus the maximum ticket vector size
// is 12 + 1.
if (old_ticket_keys) {
auto &old_keys = old_ticket_keys->keys;
auto &new_keys = ticket_keys->keys;
assert(!old_keys.empty());
assert(old_keys.size() >= 2);
new_keys.resize(2);
new_keys[1] = old_keys[0];
new_keys.resize(std::min(13ul, old_keys.size() + 1));
std::copy_n(std::begin(old_keys), new_keys.size() - 2,
std::begin(new_keys) + 1);
new_keys[0] = old_keys.back();
} else {
ticket_keys->keys.resize(1);
}
auto &new_key = ticket_keys->keys[0];
new_key.cipher = get_config()->tls_ticket_cipher;
new_key.hmac = EVP_sha256();
new_key.hmac_keylen = EVP_MD_size(new_key.hmac);
assert(static_cast<size_t>(EVP_CIPHER_key_length(new_key.cipher)) <=
sizeof(new_key.data.enc_key));
assert(new_key.hmac_keylen <= sizeof(new_key.data.hmac_key));
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "enc_keylen=" << EVP_CIPHER_key_length(new_key.cipher)
<< ", hmac_keylen=" << new_key.hmac_keylen;
}
if (RAND_bytes(reinterpret_cast<unsigned char *>(&new_key.data),
sizeof(new_key.data)) == 0) {
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "failed to renew ticket key";
ticket_keys->keys.resize(2);
if (generate_ticket_key(ticket_keys->keys[0]) != 0) {
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "failed to generate ticket key";
}
conn_handler->set_ticket_keys(nullptr);
conn_handler->worker_renew_ticket_keys(nullptr);
return;
}
}
auto &new_key = ticket_keys->keys.back();
if (generate_ticket_key(new_key) != 0) {
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "failed to generate ticket key";
}
conn_handler->set_ticket_keys(nullptr);
conn_handler->worker_renew_ticket_keys(nullptr);
return;
}
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "ticket keys generation done";
for (auto &key : ticket_keys->keys) {
LOG(INFO) << "name: " << util::format_hex(key.data.name);
assert(ticket_keys->keys.size() >= 2);
LOG(INFO) << "enc+dec: "
<< util::format_hex(ticket_keys->keys[0].data.name);
for (size_t i = 1; i < ticket_keys->keys.size() - 1; ++i) {
auto &key = ticket_keys->keys[i];
LOG(INFO) << "dec: " << util::format_hex(key.data.name);
}
LOG(INFO) << "dec, next enc: "
<< util::format_hex(ticket_keys->keys.back().data.name);
}
conn_handler->set_ticket_keys(ticket_keys);
@ -740,8 +777,8 @@ int event_loop() {
}
}
if (auto_tls_ticket_key) {
// Renew ticket key every 12hrs
ev_timer_init(&renew_ticket_key_timer, renew_ticket_key_cb, 0., 12_h);
// Generate new ticket key every 1hr.
ev_timer_init(&renew_ticket_key_timer, renew_ticket_key_cb, 0., 1_h);
renew_ticket_key_timer.data = conn_handler.get();
ev_timer_again(loop, &renew_ticket_key_timer);
@ -1317,9 +1354,10 @@ SSL/TLS:
opening or reading given file fails, all loaded keys are
discarded and it is treated as if none of this option is
given. If this option is not given or an error occurred
while opening or reading a file, key is generated
automatically and renewed every 12hrs. At most 2 keys
are stored in memory.
while opening or reading a file, key is generated every
1 hour internally and they are valid for 12 hours. This
is recommended if ticket key sharing between nghttpx
instances is not required.
--tls-ticket-cipher=<TICKET_CIPHER>
Specify cipher to encrypt TLS session ticket. Specify
either aes-128-cbc or aes-256-cbc. By default,