Make sure that password_callback exercises UI

Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2040)

apps/apps.c

@@ -252,36 +252,27 @@ int password_callback(char *buf, int bufsiz, int verify, PW_CB_DATA *cb_tmp)
     int res = 0;
 #ifndef OPENSSL_NO_UI
     UI *ui = NULL;
-    const char *prompt_info = NULL;
 #endif
-    const char *password = NULL;
     PW_CB_DATA *cb_data = (PW_CB_DATA *)cb_tmp;
 
-    if (cb_data) {
-        if (cb_data->password)
-            password = cb_data->password;
-#ifndef OPENSSL_NO_UI
-        if (cb_data->prompt_info)
-            prompt_info = cb_data->prompt_info;
-#endif
-    }
-
-    if (password) {
-        res = strlen(password);
+#ifdef OPENSSL_NO_UI
+    if (cb_data != NULL && cb_data->password != NULL) {
+        res = strlen(cb_data->password);
         if (res > bufsiz)
             res = bufsiz;
-        memcpy(buf, password, res);
-        return res;
+        memcpy(buf, cb_data->password, res);
     }
-
-#ifndef OPENSSL_NO_UI
+#else
     ui = UI_new_method(ui_method);
     if (ui) {
         int ok = 0;
         char *buff = NULL;
         int ui_flags = 0;
+        const char *prompt_info = NULL;
         char *prompt;
 
+        if (cb_data != NULL && cb_data->prompt_info != NULL)
+            prompt_info = cb_data->prompt_info;
         prompt = UI_construct_prompt(ui, "pass phrase", prompt_info);
         if (!prompt) {
             BIO_printf(bio_err, "Out of memory\n");
@@ -292,6 +283,9 @@ int password_callback(char *buf, int bufsiz, int verify, PW_CB_DATA *cb_tmp)
         ui_flags |= UI_INPUT_FLAG_DEFAULT_PWD;
         UI_ctrl(ui, UI_CTRL_PRINT_ERRORS, 1, 0, 0);
 
+        /* We know that there is no previous user data to return to us */
+        (void)UI_add_user_data(ui, cb_data);
+
         if (ok >= 0)
             ok = UI_add_input_string(ui, prompt, ui_flags, buf,
                                      PW_MIN_LENGTH, bufsiz - 1);