mirror of https://github.com/openssl/openssl.git
123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*
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* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_INTERNAL_PASSPHRASE_H
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# define OSSL_INTERNAL_PASSPHRASE_H
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# pragma once
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/*
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* This is a passphrase reader bridge with bells and whistles.
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*
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* On one hand, an API may wish to offer all sorts of passphrase callback
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* possibilities to users, or may have to do so for historical reasons.
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* On the other hand, that same API may have demands from other interfaces,
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* notably from the libcrypto <-> provider interface, which uses
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* OSSL_PASSPHRASE_CALLBACK consistently.
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*
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* The structure and functions below are the fundaments for bridging one
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* passphrase callback form to another.
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*
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* In addition, extra features are included (this may be a growing list):
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*
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* - password caching. This is to be used by APIs where it's likely
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* that the same passphrase may be asked for more than once, but the
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* user shouldn't get prompted more than once. For example, this is
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* useful for OSSL_DECODER, which may have to use a passphrase while
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* trying to find out what input it has.
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*/
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/*
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* Structure to hold whatever the calling user may specify. This structure
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* is intended to be integrated into API specific structures or to be used
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* as a local on-stack variable type. Therefore, no functions to allocate
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* or freed it on the heap is offered.
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*/
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struct ossl_passphrase_data_st {
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enum {
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is_expl_passphrase = 1, /* Explicit passphrase given by user */
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is_pem_password, /* pem_password_cb given by user */
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is_ossl_passphrase, /* OSSL_PASSPHRASE_CALLBACK given by user */
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is_ui_method /* UI_METHOD given by user */
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} type;
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union {
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struct {
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char *passphrase_copy;
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size_t passphrase_len;
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} expl_passphrase;
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struct {
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pem_password_cb *password_cb;
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void *password_cbarg;
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} pem_password;
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struct {
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OSSL_PASSPHRASE_CALLBACK *passphrase_cb;
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void *passphrase_cbarg;
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} ossl_passphrase;
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struct {
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const UI_METHOD *ui_method;
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void *ui_method_data;
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} ui_method;
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} _;
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/*-
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* Flags section
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*/
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/* Set to indicate that caching should be done */
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unsigned int flag_cache_passphrase:1;
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/*-
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* Misc section: caches and other
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*/
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char *cached_passphrase;
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size_t cached_passphrase_len;
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};
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/* Structure manipulation */
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void ossl_pw_clear_passphrase_data(struct ossl_passphrase_data_st *data);
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void ossl_pw_clear_passphrase_cache(struct ossl_passphrase_data_st *data);
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int ossl_pw_set_passphrase(struct ossl_passphrase_data_st *data,
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const unsigned char *passphrase,
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size_t passphrase_len);
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int ossl_pw_set_pem_password_cb(struct ossl_passphrase_data_st *data,
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pem_password_cb *cb, void *cbarg);
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int ossl_pw_set_ossl_passphrase_cb(struct ossl_passphrase_data_st *data,
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OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg);
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int ossl_pw_set_ui_method(struct ossl_passphrase_data_st *data,
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const UI_METHOD *ui_method, void *ui_data);
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int ossl_pw_enable_passphrase_caching(struct ossl_passphrase_data_st *data);
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int ossl_pw_disable_passphrase_caching(struct ossl_passphrase_data_st *data);
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/* Central function for direct calls */
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int ossl_pw_get_passphrase(char *pass, size_t pass_size, size_t *pass_len,
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const OSSL_PARAM params[], int verify,
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struct ossl_passphrase_data_st *data);
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/* Callback functions */
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/*
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* All of these callback expect that the callback argument is a
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* struct ossl_passphrase_data_st
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*/
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pem_password_cb ossl_pw_pem_password;
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pem_password_cb ossl_pw_pvk_password;
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/* One callback for encoding (verification prompt) and one for decoding */
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OSSL_PASSPHRASE_CALLBACK ossl_pw_passphrase_callback_enc;
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OSSL_PASSPHRASE_CALLBACK ossl_pw_passphrase_callback_dec;
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#endif
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