/*

 * Copyright 2002-2016 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/pem.h>         /* PEM_def_callback() */

#include "internal/thread_once.h"

#include "ui_local.h"

#ifndef BUFSIZ

#define BUFSIZ 256

#endif

int UI_UTIL_read_pw_string(char *buf, int length, const char *prompt,

                           int verify)

{

    char buff[BUFSIZ];

    int ret;

    ret =

        UI_UTIL_read_pw(buf, buff, (length > BUFSIZ) ? BUFSIZ : length,

                        prompt, verify);

    OPENSSL_cleanse(buff, BUFSIZ);

    return ret;

}

int UI_UTIL_read_pw(char *buf, char *buff, int size, const char *prompt,

                    int verify)

{

    int ok = 0;

    UI *ui;

    if (size < 1)

        return -1;

    ui = UI_new();

    if (ui != NULL) {

        ok = UI_add_input_string(ui, prompt, 0, buf, 0, size - 1);

        if (ok >= 0 && verify)

            ok = UI_add_verify_string(ui, prompt, 0, buff, 0, size - 1, buf);

        if (ok >= 0)

            ok = UI_process(ui);

        UI_free(ui);

    }

    if (ok > 0)

        ok = 0;

    return ok;

}

/*

 * Wrapper around pem_password_cb, a method to help older APIs use newer

 * ones.

 */

struct pem_password_cb_data {

    pem_password_cb *cb;

    int rwflag;

};

static void ui_new_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad,

                               int idx, long argl, void *argp)

{

    /*

     * Do nothing, the data is allocated externally and assigned later with

     * CRYPTO_set_ex_data()

     */

}

static int ui_dup_method_data(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,

                              void *from_d, int idx, long argl, void *argp)

{

    void **pptr = (void **)from_d;

    if (*pptr != NULL)

        *pptr = OPENSSL_memdup(*pptr, sizeof(struct pem_password_cb_data));

    return 1;

}

static void ui_free_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad,

                                int idx, long argl, void *argp)

{

    OPENSSL_free(ptr);

}

static CRYPTO_ONCE get_index_once = CRYPTO_ONCE_STATIC_INIT;

static int ui_method_data_index = -1;

DEFINE_RUN_ONCE_STATIC(ui_method_data_index_init)

{

    ui_method_data_index = CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI_METHOD,

                                                   0, NULL, ui_new_method_data,

                                                   ui_dup_method_data,

                                                   ui_free_method_data);

    return 1;

}

static int ui_open(UI *ui)

{

    return 1;

}

static int ui_read(UI *ui, UI_STRING *uis)

{

    switch (UI_get_string_type(uis)) {

    case UIT_PROMPT:

        {

            char result[PEM_BUFSIZE + 1];

            const struct pem_password_cb_data *data =

                UI_method_get_ex_data(UI_get_method(ui), ui_method_data_index);

            int maxsize = UI_get_result_maxsize(uis);

            int len = data->cb(result,

                               maxsize > PEM_BUFSIZE ? PEM_BUFSIZE : maxsize,

                               data->rwflag, UI_get0_user_data(ui));

            if (len >= 0)

                result[len] = '\0';

            if (len <= 0)

                return len;

            if (UI_set_result_ex(ui, uis, result, len) >= 0)

                return 1;

            return 0;

        }

    case UIT_VERIFY:

    case UIT_NONE:

    case UIT_BOOLEAN:

    case UIT_INFO:

    case UIT_ERROR:

        break;

    }

    return 1;

}

static int ui_write(UI *ui, UI_STRING *uis)

{

    return 1;

}

static int ui_close(UI *ui)

{

    return 1;

}

UI_METHOD *UI_UTIL_wrap_read_pem_callback(pem_password_cb *cb, int rwflag)

{

    struct pem_password_cb_data *data = NULL;

    UI_METHOD *ui_method = NULL;

    if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL

        || (ui_method = UI_create_method("PEM password callback wrapper")) == NULL

        || UI_method_set_opener(ui_method, ui_open) < 0

        || UI_method_set_reader(ui_method, ui_read) < 0

        || UI_method_set_writer(ui_method, ui_write) < 0

        || UI_method_set_closer(ui_method, ui_close) < 0

        || !RUN_ONCE(&get_index_once, ui_method_data_index_init)

        || UI_method_set_ex_data(ui_method, ui_method_data_index, data) < 0) {

        UI_destroy_method(ui_method);

        OPENSSL_free(data);

        return NULL;

    }

    data->rwflag = rwflag;

    data->cb = cb != NULL ? cb : PEM_def_callback;

    return ui_method;

}