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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/err.h>
#include <openssl/ui.h>
#include "apps_ui.h"
static UI_METHOD *ui_method = NULL;
static const UI_METHOD *ui_fallback_method = NULL;
static int ui_open(UI *ui)
{
int (*opener)(UI *ui) = UI_method_get_opener(ui_fallback_method);
if (opener)
return opener(ui);
return 1;
}
static int ui_read(UI *ui, UI_STRING *uis)
{
int (*reader)(UI *ui, UI_STRING *uis) = NULL;
if (UI_get_input_flags(uis) & UI_INPUT_FLAG_DEFAULT_PWD
&& UI_get0_user_data(ui)) {
switch (UI_get_string_type(uis)) {
case UIT_PROMPT:
case UIT_VERIFY:
{
const char *password =
((PW_CB_DATA *)UI_get0_user_data(ui))->password;
if (password && password[0] != '\0') {
UI_set_result(ui, uis, password);
return 1;
}
}
break;
case UIT_NONE:
case UIT_BOOLEAN:
case UIT_INFO:
case UIT_ERROR:
break;
}
}
reader = UI_method_get_reader(ui_fallback_method);
if (reader)
return reader(ui, uis);
return 1;
}
static int ui_write(UI *ui, UI_STRING *uis)
{
int (*writer)(UI *ui, UI_STRING *uis) = NULL;
if (UI_get_input_flags(uis) & UI_INPUT_FLAG_DEFAULT_PWD
&& UI_get0_user_data(ui)) {
switch (UI_get_string_type(uis)) {
case UIT_PROMPT:
case UIT_VERIFY:
{
const char *password =
((PW_CB_DATA *)UI_get0_user_data(ui))->password;
if (password && password[0] != '\0')
return 1;
}
break;
case UIT_NONE:
case UIT_BOOLEAN:
case UIT_INFO:
case UIT_ERROR:
break;
}
}
writer = UI_method_get_writer(ui_fallback_method);
if (writer)
return writer(ui, uis);
return 1;
}
static int ui_close(UI *ui)
{
int (*closer)(UI *ui) = UI_method_get_closer(ui_fallback_method);
if (closer)
return closer(ui);
return 1;
}
int setup_ui_method(void)
{
ui_fallback_method = UI_null();
#ifndef OPENSSL_NO_UI_CONSOLE
ui_fallback_method = UI_OpenSSL();
#endif
ui_method = UI_create_method("OpenSSL application user interface");
UI_method_set_opener(ui_method, ui_open);
UI_method_set_reader(ui_method, ui_read);
UI_method_set_writer(ui_method, ui_write);
UI_method_set_closer(ui_method, ui_close);
return 0;
}
void destroy_ui_method(void)
{
if (ui_method) {
UI_destroy_method(ui_method);
ui_method = NULL;
}
}
const UI_METHOD *get_ui_method(void)
{
return ui_method;
}
static void *ui_malloc(int sz, const char *what)
{
void *vp = OPENSSL_malloc(sz);
if (vp == NULL) {
BIO_printf(bio_err, "Could not allocate %d bytes for %s\n", sz, what);
ERR_print_errors(bio_err);
exit(1);
}
return vp;
}
int password_callback(char *buf, int bufsiz, int verify, PW_CB_DATA *cb_data)
{
int res = 0;
UI *ui;
int ok = 0;
char *buff = NULL;
int ui_flags = 0;
const char *prompt_info = NULL;
char *prompt;
if ((ui = UI_new_method(ui_method)) == NULL)
return 0;
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 == NULL) {
BIO_printf(bio_err, "Out of memory\n");
UI_free(ui);
return 0;
}
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);
ok = UI_add_input_string(ui, prompt, ui_flags, buf,
PW_MIN_LENGTH, bufsiz - 1);
if (ok >= 0 && verify) {
buff = ui_malloc(bufsiz, "password buffer");
ok = UI_add_verify_string(ui, prompt, ui_flags, buff,
PW_MIN_LENGTH, bufsiz - 1, buf);
}
if (ok >= 0)
do {
ok = UI_process(ui);
} while (ok < 0 && UI_ctrl(ui, UI_CTRL_IS_REDOABLE, 0, 0, 0));
OPENSSL_clear_free(buff, (unsigned int)bufsiz);
if (ok >= 0)
res = strlen(buf);
if (ok == -1) {
BIO_printf(bio_err, "User interface error\n");
ERR_print_errors(bio_err);
OPENSSL_cleanse(buf, (unsigned int)bufsiz);
res = 0;
}
if (ok == -2) {
BIO_printf(bio_err, "aborted!\n");
OPENSSL_cleanse(buf, (unsigned int)bufsiz);
res = 0;
}
UI_free(ui);
OPENSSL_free(prompt);
return res;
}
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