static bool
ConnSSL_Init_SSL(CONNECTION *c)
{
int ret;
assert(c != NULL);
#ifdef HAVE_LIBSSL
if (!ssl_ctx) {
Log(LOG_ERR, "Cannot init ssl_ctx: OpenSSL initialization failed at startup");
return false;
}
assert(c->ssl_state.ssl == NULL);
c->ssl_state.ssl = SSL_new(ssl_ctx);
if (!c->ssl_state.ssl) {
LogOpenSSLError("SSL_new()", NULL);
return false;
}
ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
if (ret != 1) {
LogOpenSSLError("SSL_set_fd()", NULL);
ConnSSL_Free(c);
return false;
}
#endif
#ifdef HAVE_LIBGNUTLS
ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
if (ret < 0) {
Log(LOG_ERR, "gnutls_set_default_priority: %s", gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
/*
* The intermediate (long) cast is here to avoid a warning like:
* "cast to pointer from integer of different size" on 64-bit platforms.
* There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
* http://www.mail-archive.com/[email protected]/msg00286.html
*/
gnutls_transport_set_ptr(c->ssl_state.gnutls_session, (gnutls_transport_ptr_t) (long) c->sock);
ret = gnutls_credentials_set(c->ssl_state.gnutls_session, GNUTLS_CRD_CERTIFICATE, x509_cred);
if (ret < 0) {
Log(LOG_ERR, "gnutls_credentials_set: %s", gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
#endif
Conn_OPTION_ADD(c, CONN_SSL);
return true;
}
bool
ConnSSL_InitLibrary( void )
{
#ifdef HAVE_LIBSSL
SSL_CTX *newctx;
if (!ssl_ctx) {
SSL_library_init();
SSL_load_error_strings();
}
if (!RAND_status()) {
Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
/*
* it is probably best to fail and let the user install EGD or a similar program if no kernel random device is available.
* According to OpenSSL RAND_egd(3): "The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7";
* so it makes little sense to deal with PRNGD seeding ourselves.
*/
return false;
}
newctx = SSL_CTX_new(SSLv23_method());
if (!newctx) {
LogOpenSSLError("SSL_CTX_new()", NULL);
return false;
}
if (!ConnSSL_LoadServerKey_openssl(newctx))
goto out;
SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_free(ssl_ctx);
ssl_ctx = newctx;
Log(LOG_INFO, "%s initialized.", SSLeay_version(SSLEAY_VERSION));
return true;
out:
SSL_CTX_free(newctx);
return false;
#endif
#ifdef HAVE_LIBGNUTLS
int err;
static bool initialized;
if (initialized) /* TODO: cannot reload gnutls keys: can't simply free x509 context -- it may still be in use */
return false;
err = gnutls_global_init();
if (err) {
Log(LOG_ERR, "gnutls_global_init(): %s", gnutls_strerror(err));
return false;
}
if (!ConnSSL_LoadServerKey_gnutls())
return false;
Log(LOG_INFO, "gnutls %s initialized.", gnutls_check_version(NULL));
initialized = true;
return true;
#endif
}
static bool
ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
{
char *cert_key;
assert(ctx);
if (!Conf_SSLOptions.KeyFile) {
Log(LOG_ERR, "No SSL server key configured!");
return false;
}
SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
LogOpenSSLError("Failed to add private key", Conf_SSLOptions.KeyFile);
return false;
}
cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
LogOpenSSLError("Failed to load certificate chain", cert_key);
return false;
}
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
if (!SSL_CTX_check_private_key(ctx)) {
LogOpenSSLError("Server private key does not match certificate", NULL);
return false;
}
if (Load_DH_params()) {
if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
LogOpenSSLError("Error setting DH parameters", Conf_SSLOptions.DHFile);
/* don't return false here: the non-DH modes will still work */
DH_free(dh_params);
dh_params = NULL;
}
return true;
}
/**
* Check and handle error return codes after failed calls to SSL functions.
*
* OpenSSL:
* SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or
* SSL_write() on ssl.
*
* GnuTLS:
* gnutlsssl_read(), gnutls_write() or gnutls_handshake().
*
* @param c The connection handle.
* @prarm code The return code.
* @param fname The name of the function in which the error occurred.
* @return -1 on fatal errors, 0 if we can try again later.
*/
static int
ConnSSL_HandleError(CONNECTION * c, const int code, const char *fname)
{
#ifdef HAVE_LIBSSL
int ret = SSL_ERROR_SYSCALL;
unsigned long sslerr;
int real_errno = errno;
ret = SSL_get_error(c->ssl_state.ssl, code);
switch (ret) {
case SSL_ERROR_WANT_READ:
io_event_del(c->sock, IO_WANTWRITE);
Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
return 0; /* try again later */
case SSL_ERROR_WANT_WRITE:
io_event_del(c->sock, IO_WANTREAD);
Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
case SSL_ERROR_NONE:
return 0; /* try again later */
case SSL_ERROR_ZERO_RETURN:
LogDebug("SSL connection shut down normally.");
break;
case SSL_ERROR_SYSCALL:
/* SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT,
* and SSL_ERROR_WANT_X509_LOOKUP */
sslerr = ERR_get_error();
if (sslerr) {
Log(LOG_ERR, "SSL error: %s [in %s()]!",
ERR_error_string(sslerr, NULL), fname);
} else {
switch (code) { /* EOF that violated protocol */
case 0:
Log(LOG_ERR,
"SSL error, client disconnected [in %s()]!",
fname);
break;
case -1: /* low level socket I/O error, check errno */
Log(LOG_ERR, "SSL error: %s [in %s()]!",
strerror(real_errno), fname);
}
}
break;
case SSL_ERROR_SSL:
LogOpenSSLError("SSL protocol error", fname);
break;
default:
Log(LOG_ERR, "Unknown SSL error %d [in %s()]!", ret, fname);
}
ConnSSL_Free(c);
return -1;
#endif
#ifdef HAVE_LIBGNUTLS
switch (code) {
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) {
Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE);
io_event_del(c->sock, IO_WANTREAD);
} else {
Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
io_event_del(c->sock, IO_WANTWRITE);
}
break;
default:
assert(code < 0);
if (gnutls_error_is_fatal(code)) {
Log(LOG_ERR, "SSL error: %s [%s].",
gnutls_strerror(code), fname);
ConnSSL_Free(c);
return -1;
}
}
return 0;
#endif
}
static bool
ConnSSL_Init_SSL(CONNECTION *c)
{
int ret;
LogDebug("Initializing SSL ...");
assert(c != NULL);
#ifdef HAVE_LIBSSL
if (!ssl_ctx) {
Log(LOG_ERR,
"Can't initialize SSL context, OpenSSL initialization failed at startup!");
return false;
}
assert(c->ssl_state.ssl == NULL);
assert(c->ssl_state.fingerprint == NULL);
c->ssl_state.ssl = SSL_new(ssl_ctx);
if (!c->ssl_state.ssl) {
LogOpenSSLError("Failed to create SSL structure", NULL);
return false;
}
Conn_OPTION_ADD(c, CONN_SSL);
ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
if (ret != 1) {
LogOpenSSLError("Failed to set SSL file descriptor", NULL);
ConnSSL_Free(c);
return false;
}
#endif
#ifdef HAVE_LIBGNUTLS
Conn_OPTION_ADD(c, CONN_SSL);
ret = gnutls_priority_set(c->ssl_state.gnutls_session, priorities_cache);
if (ret != GNUTLS_E_SUCCESS) {
Log(LOG_ERR, "Failed to set GnuTLS session priorities: %s",
gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
/*
* The intermediate (long) cast is here to avoid a warning like:
* "cast to pointer from integer of different size" on 64-bit platforms.
* There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
* http://www.mail-archive.com/[email protected]/msg00286.html
*/
gnutls_transport_set_ptr(c->ssl_state.gnutls_session,
(gnutls_transport_ptr_t) (long) c->sock);
gnutls_certificate_server_set_request(c->ssl_state.gnutls_session,
GNUTLS_CERT_REQUEST);
ret = gnutls_credentials_set(c->ssl_state.gnutls_session,
GNUTLS_CRD_CERTIFICATE, x509_cred);
if (ret != 0) {
Log(LOG_ERR, "Failed to set SSL credentials: %s",
gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
#endif
return true;
}
bool
ConnSSL_InitLibrary( void )
{
if (!Conf_SSLInUse()) {
LogDebug("SSL not in use, skipping initialization.");
return true;
}
#ifdef HAVE_LIBSSL
SSL_CTX *newctx;
if (!ssl_ctx) {
SSL_library_init();
SSL_load_error_strings();
}
if (!RAND_status()) {
Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
/*
* it is probably best to fail and let the user install EGD or
* a similar program if no kernel random device is available.
* According to OpenSSL RAND_egd(3): "The automatic query of
* /var/run/egd-pool et al was added in OpenSSL 0.9.7";
* so it makes little sense to deal with PRNGD seeding ourselves.
*/
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
newctx = SSL_CTX_new(SSLv23_method());
if (!newctx) {
LogOpenSSLError("Failed to create SSL context", NULL);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
if (!ConnSSL_LoadServerKey_openssl(newctx))
goto out;
if (SSL_CTX_set_cipher_list(newctx, Conf_SSLOptions.CipherList) == 0) {
Log(LOG_ERR, "Failed to apply OpenSSL cipher list \"%s\"!",
Conf_SSLOptions.CipherList);
goto out;
}
SSL_CTX_set_session_id_context(newctx, (unsigned char *)"ngircd", 6);
SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_verify(newctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
Verify_openssl);
SSL_CTX_free(ssl_ctx);
ssl_ctx = newctx;
Log(LOG_INFO, "%s initialized.", SSLeay_version(SSLEAY_VERSION));
return true;
out:
SSL_CTX_free(newctx);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
#endif
#ifdef HAVE_LIBGNUTLS
int err;
static bool initialized;
if (initialized) {
/* TODO: cannot reload gnutls keys: can't simply free x509
* context -- it may still be in use */
return false;
}
err = gnutls_global_init();
if (err) {
Log(LOG_ERR, "Failed to initialize GnuTLS: %s",
gnutls_strerror(err));
goto out;
}
if (!ConnSSL_LoadServerKey_gnutls())
goto out;
if (gnutls_priority_init(&priorities_cache, Conf_SSLOptions.CipherList,
NULL) != GNUTLS_E_SUCCESS) {
Log(LOG_ERR,
"Failed to apply GnuTLS cipher list \"%s\"!",
Conf_SSLOptions.CipherList);
goto out;
}
Log(LOG_INFO, "GnuTLS %s initialized.", gnutls_check_version(NULL));
initialized = true;
return true;
out:
array_free(&Conf_SSLOptions.ListenPorts);
return false;
#endif
}
