}
static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx);
+static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
namespace OpenSSL
{
class Context
{
SSL_CTX* const ctx;
+ long ctx_options;
public:
Context(SSL_CTX* context)
{
// Sane default options for OpenSSL see https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
// and when choosing a cipher, use the server's preferences instead of the client preferences.
- SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CIPHER_SERVER_PREFERENCE);
+ long opts = SSL_OP_NO_SSLv2 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_SINGLE_DH_USE;
+ // Only turn options on if they exist
+#ifdef SSL_OP_SINGLE_ECDH_USE
+ opts |= SSL_OP_SINGLE_ECDH_USE;
+#endif
+#ifdef SSL_OP_NO_TICKET
+ opts |= SSL_OP_NO_TICKET;
+#endif
+
+ ctx_options = SSL_CTX_set_options(ctx, opts);
SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
-
- const unsigned char session_id[] = "inspircd";
- SSL_CTX_set_session_id_context(ctx, session_id, sizeof(session_id) - 1);
+ SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
+ SSL_CTX_set_info_callback(ctx, StaticSSLInfoCallback);
}
~Context()
bool SetDH(DHParams& dh)
{
+ ERR_clear_error();
return (SSL_CTX_set_tmp_dh(ctx, dh.get()) >= 0);
}
+#ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
+ void SetECDH(const std::string& curvename)
+ {
+ int nid = OBJ_sn2nid(curvename.c_str());
+ if (nid == 0)
+ throw Exception("Unknown curve: " + curvename);
+
+ EC_KEY* eckey = EC_KEY_new_by_curve_name(nid);
+ if (!eckey)
+ throw Exception("Unable to create EC key object");
+
+ ERR_clear_error();
+ bool ret = (SSL_CTX_set_tmp_ecdh(ctx, eckey) >= 0);
+ EC_KEY_free(eckey);
+ if (!ret)
+ throw Exception("Couldn't set ECDH parameters");
+ }
+#endif
+
bool SetCiphers(const std::string& ciphers)
{
+ ERR_clear_error();
return SSL_CTX_set_cipher_list(ctx, ciphers.c_str());
}
bool SetCerts(const std::string& filename)
{
+ ERR_clear_error();
return SSL_CTX_use_certificate_chain_file(ctx, filename.c_str());
}
bool SetPrivateKey(const std::string& filename)
{
+ ERR_clear_error();
return SSL_CTX_use_PrivateKey_file(ctx, filename.c_str(), SSL_FILETYPE_PEM);
}
bool SetCA(const std::string& filename)
{
+ ERR_clear_error();
return SSL_CTX_load_verify_locations(ctx, filename.c_str(), 0);
}
+ long GetDefaultContextOptions() const
+ {
+ return ctx_options;
+ }
+
+ long SetRawContextOptions(long setoptions, long clearoptions)
+ {
+ // Clear everything
+ SSL_CTX_clear_options(ctx, SSL_CTX_get_options(ctx));
+
+ // Set the default options and what is in the conf
+ SSL_CTX_set_options(ctx, ctx_options | setoptions);
+ return SSL_CTX_clear_options(ctx, clearoptions);
+ }
+
SSL* CreateSession()
{
return SSL_new(ctx);
*/
std::string lasterr;
+ /** True if renegotiations are allowed, false if not
+ */
+ const bool allowrenego;
+
static int error_callback(const char* str, size_t len, void* u)
{
Profile* profile = reinterpret_cast<Profile*>(u);
return 0;
}
+ /** Set raw OpenSSL context (SSL_CTX) options from a config tag
+ * @param ctxname Name of the context, client or server
+ * @param tag Config tag defining this profile
+ * @param context Context object to manipulate
+ */
+ void SetContextOptions(const std::string& ctxname, ConfigTag* tag, Context& context)
+ {
+ long setoptions = tag->getInt(ctxname + "setoptions");
+ long clearoptions = tag->getInt(ctxname + "clearoptions");
+#ifdef SSL_OP_NO_COMPRESSION
+ if (!tag->getBool("compression", true))
+ setoptions |= SSL_OP_NO_COMPRESSION;
+#endif
+ if (!tag->getBool("sslv3", true))
+ setoptions |= SSL_OP_NO_SSLv3;
+ if (!tag->getBool("tlsv1", true))
+ setoptions |= SSL_OP_NO_TLSv1;
+
+ if (!setoptions && !clearoptions)
+ return; // Nothing to do
+
+ ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Setting %s %s context options, default: %ld set: %ld clear: %ld", name.c_str(), ctxname.c_str(), ctx.GetDefaultContextOptions(), setoptions, clearoptions);
+ long final = context.SetRawContextOptions(setoptions, clearoptions);
+ ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "%s %s context options: %ld", name.c_str(), ctxname.c_str(), final);
+ }
+
public:
Profile(const std::string& profilename, ConfigTag* tag)
: name(profilename)
, dh(ServerInstance->Config->Paths.PrependConfig(tag->getString("dhfile", "dh.pem")))
, ctx(SSL_CTX_new(SSLv23_server_method()))
, clictx(SSL_CTX_new(SSLv23_client_method()))
+ , allowrenego(tag->getBool("renegotiation", true))
{
if ((!ctx.SetDH(dh)) || (!clictx.SetDH(dh)))
throw Exception("Couldn't set DH parameters");
}
}
+#ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
+ std::string curvename = tag->getString("ecdhcurve", "prime256v1");
+ if (!curvename.empty())
+ ctx.SetECDH(curvename);
+#endif
+
+ SetContextOptions("server", tag, ctx);
+ SetContextOptions("client", tag, clictx);
+
/* Load our keys and certificates
* NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
*/
SSL* CreateServerSession() { return ctx.CreateSession(); }
SSL* CreateClientSession() { return clictx.CreateSession(); }
const EVP_MD* GetDigest() { return digest; }
+ bool AllowRenegotiation() const { return allowrenego; }
};
}
{
int ret;
+ ERR_clear_error();
if (outbound)
ret = SSL_connect(sess);
else
else if (ret == 0)
{
CloseSession();
- return true;
}
-
- return true;
+ return false;
}
void CloseSession()
sess = NULL;
certificate = NULL;
status = ISSL_NONE;
- errno = EIO;
}
void VerifyCertificate()
X509_free(cert);
}
+#ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
+ void SSLInfoCallback(int where, int rc)
+ {
+ if ((where & SSL_CB_HANDSHAKE_START) && (status == ISSL_OPEN))
+ {
+ if (profile->AllowRenegotiation())
+ return;
+
+ // The other side is trying to renegotiate, kill the connection and change status
+ // to ISSL_NONE so CheckRenego() closes the session
+ status = ISSL_NONE;
+ SocketEngine::Shutdown(SSL_get_fd(sess), 2);
+ }
+ }
+
+ bool CheckRenego(StreamSocket* sock)
+ {
+ if (status != ISSL_NONE)
+ return true;
+
+ ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Session %p killed, attempted to renegotiate", (void*)sess);
+ CloseSession();
+ sock->SetError("Renegotiation is not allowed");
+ return false;
+ }
+#endif
+
+ // Calls our private SSLInfoCallback()
+ friend void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
+
public:
OpenSSLIOHook(IOHookProvider* hookprov, StreamSocket* sock, bool is_outbound, SSL* session, const reference<OpenSSL::Profile>& sslprofile)
: SSLIOHook(hookprov)
if (status == ISSL_OPEN)
{
+ ERR_clear_error();
char* buffer = ServerInstance->GetReadBuffer();
size_t bufsiz = ServerInstance->Config->NetBufferSize;
int ret = SSL_read(sess, buffer, bufsiz);
+#ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
+ if (!CheckRenego(user))
+ return -1;
+#endif
+
if (ret > 0)
{
recvq.append(buffer, ret);
if (status == ISSL_OPEN)
{
+ ERR_clear_error();
int ret = SSL_write(sess, buffer.data(), buffer.size());
+
+#ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
+ if (!CheckRenego(user))
+ return -1;
+#endif
+
if (ret == (int)buffer.length())
{
data_to_write = false;
}
};
+static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc)
+{
+#ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
+ OpenSSLIOHook* hook = static_cast<OpenSSLIOHook*>(SSL_get_ex_data(ssl, exdataindex));
+ hook->SSLInfoCallback(where, rc);
+#endif
+}
+
class OpenSSLIOHookProvider : public refcountbase, public IOHookProvider
{
reference<OpenSSL::Profile> profile;
projects / user / henk / code / inspircd.git / blobdiff