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secur32: Check for supported protocols when loading gnutls. 

We mostly need to know if TLS1.3 is supported before attempting to
handle it. It's just in gnutls backend now, so it will not be actually
enabled yet.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2018-12-07 15:29:51 +01:00 committed by Alexandre Julliard
parent ea77ba04f3
commit 9dd0f8f4b7
1 changed files with 36 additions and 2 deletions
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38
dlls/secur32/schannel_gnutls.c
View File

@ -23,6 +23,7 @@
#include "wine/port.h"
#include <stdarg.h>
#include <stdio.h>
#ifdef SONAME_LIBGNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
@ -150,6 +151,7 @@ static const struct {
DWORD enable_flag;
const char *gnutls_flag;
} protocol_priority_flags[] = {
{SP_PROT_TLS1_3_CLIENT, "VERS-TLS1.3"},
{SP_PROT_TLS1_2_CLIENT, "VERS-TLS1.2"},
{SP_PROT_TLS1_1_CLIENT, "VERS-TLS1.1"},
{SP_PROT_TLS1_0_CLIENT, "VERS-TLS1.0"},
@ -157,10 +159,41 @@ static const struct {
/* {SP_PROT_SSL2_CLIENT} is not supported by GnuTLS */
};
static DWORD supported_protocols;
static void check_supported_protocols(void)
{
gnutls_session_t session;
char priority[64];
unsigned i;
int err;
err = pgnutls_init(&session, GNUTLS_CLIENT);
if (err != GNUTLS_E_SUCCESS)
{
pgnutls_perror(err);
return;
}
for(i = 0; i < ARRAY_SIZE(protocol_priority_flags); i++)
{
sprintf(priority, "NORMAL:-%s", protocol_priority_flags[i].gnutls_flag);
err = pgnutls_priority_set_direct(session, priority, NULL);
if (err == GNUTLS_E_SUCCESS)
{
TRACE("%s is supported\n", protocol_priority_flags[i].gnutls_flag);
supported_protocols |= protocol_priority_flags[i].enable_flag;
}
else
TRACE("%s is not supported\n", protocol_priority_flags[i].gnutls_flag);
}
pgnutls_deinit(session);
}
DWORD schan_imp_enabled_protocols(void)
{
/* NOTE: No support for SSL 2.0 */
return SP_PROT_SSL3_CLIENT | SP_PROT_TLS1_0_CLIENT | SP_PROT_TLS1_1_CLIENT | SP_PROT_TLS1_2_CLIENT;
return supported_protocols;
}
BOOL schan_imp_create_session(schan_imp_session *session, schan_credentials *cred)
@ -593,6 +626,7 @@ BOOL schan_imp_init(void)
pgnutls_global_set_log_function(schan_gnutls_log);
}
check_supported_protocols();
return TRUE;
fail: