Update OpenSSL initialization

- Set env variables such as OPENSSL_CONF and OPENSSL_MODULES
- Replace deprecated initialization (since OpenSSL 1.1.0)
  by OpenSSL_init_crypto()

Signed-off-by: Selva Nair <selva.nair@gmail.com>

main.c

@@ -53,8 +53,7 @@
 #include "as.h"
 
 #ifndef DISABLE_CHANGE_PASSWORD
-#include <openssl/evp.h>
-#include <openssl/err.h>
+#include <openssl/crypto.h>
 #endif
 
 #define OVPN_EXITCODE_ERROR      1
@@ -287,9 +286,9 @@ int WINAPI _tWinMain (HINSTANCE hThisInstance,
 
 #ifndef DISABLE_CHANGE_PASSWORD
   /* Initialize OpenSSL */
-  OpenSSL_add_all_algorithms();
-  ERR_load_crypto_strings();
-#endif
+  set_openssl_env_vars();
+  OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
+#endif /* DISABLE_CHANGE_PASSWORD */
 
   /* The Window structure */
   wincl.hInstance = hThisInstance;

misc.c

@@ -713,3 +713,28 @@ ImportConfigFile(const TCHAR* source, bool prompt_user)
     /* destroy popup menus, based on existing num_configs, rescan file list and recreate menus */
     RecreatePopupMenus();
 }
+
+void
+set_openssl_env_vars()
+{
+    struct {
+        WCHAR *name;
+        WCHAR *value;
+    } ossl_env[] = {
+        {L"OPENSSL_CONF", L"ssl\\openssl.cnf"},
+        {L"OPENSSL_ENGINES", L"ssl\\engines"},
+        {L"OPENSSL_MODULES", L"ssl\\modules"}
+    };
+    for (size_t i = 0; i < _countof(ossl_env); i++)
+    {
+        size_t size = 0;
+
+        _wgetenv_s(&size, NULL, 0, ossl_env[i].name);
+        if (size == 0)
+        {
+            WCHAR val[MAX_PATH] = {0};
+            _sntprintf_0(val, L"%ls%ls", o.install_path, ossl_env[i].value);
+            _wputenv_s(ossl_env[i].name, val);
+        }
+    }
+}

misc.h

@@ -81,4 +81,9 @@ void ImportConfigFile(const TCHAR* path, bool prompt_user);
 BOOL
 GetDlgItemTextUtf8(HWND hDlg, int id, LPSTR* str, int* len);
 
+/*
+ * Set env vars used by OpenSSL to sane values.
+ */
+void set_openssl_env_vars(void);
+
 #endif

options.c

@@ -78,6 +78,7 @@ ExpandOptions (void)
     ExpandString (o.log_dir, _countof(o.log_dir));
     ExpandString (o.editor, _countof(o.editor));
     ExpandString (o.log_viewer, _countof(o.log_viewer));
+    ExpandString (o.install_path, _countof(o.install_path));
 }
 
 static int

options.h

@@ -185,6 +185,7 @@ typedef struct {
 
     /* HKLM Registry values */
     TCHAR exe_path[MAX_PATH];
+    TCHAR install_path[MAX_PATH];
     TCHAR global_config_dir[MAX_PATH];
     TCHAR priority_string[64];
     TCHAR ovpn_admin_group[MAX_NAME];

registry.c

@@ -78,7 +78,6 @@ static int
 GetGlobalRegistryKeys()
 {
   TCHAR windows_dir[MAX_PATH];
-  TCHAR openvpn_path[MAX_PATH];
   HKEY regkey;
 
   if (!GetWindowsDirectory(windows_dir, _countof(windows_dir))) {
@@ -100,23 +99,23 @@ GetGlobalRegistryKeys()
       regkey = NULL;
       ShowLocalizedMsg(IDS_ERR_OPEN_REGISTRY);
     }
-  if (!regkey || !GetRegistryValue(regkey, _T(""), openvpn_path, _countof(openvpn_path))
-      || _tcslen(openvpn_path) == 0)
+  if (!regkey || !GetRegistryValue(regkey, _T(""), o.install_path, _countof(o.install_path))
+      || _tcslen(o.install_path) == 0)
     {
       /* error reading registry value */
       if (regkey)
           ShowLocalizedMsg(IDS_ERR_READING_REGISTRY);
       /* Use a sane default value */
-      _sntprintf_0(openvpn_path, _T("%ls"), _T("C:\\Program Files\\OpenVPN\\"));
+      _sntprintf_0(o.install_path, _T("%ls"), _T("C:\\Program Files\\OpenVPN\\"));
     }
-  if (openvpn_path[_tcslen(openvpn_path) - 1] != _T('\\'))
-    _tcscat(openvpn_path, _T("\\"));
+  if (o.install_path[_tcslen(o.install_path) - 1] != _T('\\'))
+    _tcscat(o.install_path, _T("\\"));
 
   /* an admin-defined global config dir defined in HKLM\OpenVPN\config_dir */
   if (!regkey || !GetRegistryValue(regkey, _T("config_dir"), o.global_config_dir, _countof(o.global_config_dir)))
     {
       /* use default = openvpnpath\config */
-      _sntprintf_0(o.global_config_dir, _T("%lsconfig"), openvpn_path);
+      _sntprintf_0(o.global_config_dir, _T("%lsconfig"), o.install_path);
     }
 
   if (!regkey || !GetRegistryValue(regkey, _T("ovpn_admin_group"), o.ovpn_admin_group, _countof(o.ovpn_admin_group)))
@@ -126,7 +125,7 @@ GetGlobalRegistryKeys()
 
   if (!regkey || !GetRegistryValue(regkey, _T("exe_path"), o.exe_path, _countof(o.exe_path)))
     {
-      _sntprintf_0(o.exe_path, _T("%lsbin\\openvpn.exe"), openvpn_path);
+      _sntprintf_0(o.exe_path, _T("%lsbin\\openvpn.exe"), o.install_path);
     }
 
   if (!regkey || !GetRegistryValue(regkey, _T("priority"), o.priority_string, _countof(o.priority_string)))