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;
}
GLOBAL bool
Zip_InitConn( CONN_ID Idx )
{
/* initialize zlib compression on this link */
assert( Idx > NONE );
My_Connections[Idx].zip.in.avail_in = 0;
My_Connections[Idx].zip.in.total_in = 0;
My_Connections[Idx].zip.in.total_out = 0;
My_Connections[Idx].zip.in.zalloc = NULL;
My_Connections[Idx].zip.in.zfree = NULL;
My_Connections[Idx].zip.in.data_type = Z_ASCII;
if (inflateInit( &My_Connections[Idx].zip.in ) != Z_OK) {
Log(LOG_ALERT, "Can't initialize compression on connection %d (zlib inflate)!", Idx);
return false;
}
My_Connections[Idx].zip.out.total_in = 0;
My_Connections[Idx].zip.out.total_in = 0;
My_Connections[Idx].zip.out.zalloc = NULL;
My_Connections[Idx].zip.out.zfree = NULL;
My_Connections[Idx].zip.out.data_type = Z_ASCII;
if (deflateInit( &My_Connections[Idx].zip.out, Z_DEFAULT_COMPRESSION ) != Z_OK) {
Log(LOG_ALERT, "Can't initialize compression on connection %d (zlib deflate)!", Idx);
return false;
}
My_Connections[Idx].zip.bytes_in = My_Connections[Idx].bytes_in;
My_Connections[Idx].zip.bytes_out = My_Connections[Idx].bytes_out;
Log(LOG_INFO, "Enabled link compression (zlib) on connection %d.", Idx);
Conn_OPTION_ADD( &My_Connections[Idx], CONN_ZIP );
return true;
} /* Zip_InitConn */
bool
ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
{
bool ret;
#ifdef HAVE_LIBGNUTLS
int err;
err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
if (err) {
Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
return false;
}
#endif
ret = ConnSSL_Init_SSL(c);
if (!ret)
return false;
Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
#ifdef HAVE_LIBSSL
assert(c->ssl_state.ssl);
SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
#endif
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;
}
