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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
/*
* This is a very simple provider that does absolutely nothing except respond
* to provider global parameter requests. It does this by simply echoing back
* a parameter request it makes to the loading library.
*/
#include <string.h>
#include <stdio.h>
/*
* When built as an object file to link the application with, we get the
* init function name through the macro PROVIDER_INIT_FUNCTION_NAME. If
* not defined, we use the standard init function name for the shared
* object form.
*/
#ifdef PROVIDER_INIT_FUNCTION_NAME
# define OSSL_provider_init PROVIDER_INIT_FUNCTION_NAME
#endif
#include <openssl/core.h>
#include <openssl/core_numbers.h>
static OSSL_core_gettable_params_fn *c_gettable_params = NULL;
static OSSL_core_get_params_fn *c_get_params = NULL;
/* Tell the core what params we provide and what type they are */
static const OSSL_PARAM p_param_types[] = {
{ "greeting", OSSL_PARAM_UTF8_STRING, NULL, 0, 0 },
{ NULL, 0, NULL, 0, 0 }
};
/* This is a trick to ensure we define the provider functions correctly */
static OSSL_provider_gettable_params_fn p_gettable_params;
static OSSL_provider_get_params_fn p_get_params;
static OSSL_provider_get_reason_strings_fn p_get_reason_strings;
static const OSSL_PARAM *p_gettable_params(void *_)
{
return p_param_types;
}
static int p_get_params(void *vhand, OSSL_PARAM params[])
{
const OSSL_CORE_HANDLE *hand = vhand;
OSSL_PARAM *p = params;
int ok = 1;
for (; ok && p->key != NULL; p++) {
if (strcmp(p->key, "greeting") == 0) {
static char *opensslv;
static char *provname;
static char *greeting;
static OSSL_PARAM counter_request[] = {
/* Known libcrypto provided parameters */
{ "openssl-version", OSSL_PARAM_UTF8_PTR,
&opensslv, sizeof(&opensslv), 0 },
{ "provider-name", OSSL_PARAM_UTF8_PTR,
&provname, sizeof(&provname), 0},
/* This might be present, if there's such a configuration */
{ "greeting", OSSL_PARAM_UTF8_PTR,
&greeting, sizeof(&greeting), 0 },
{ NULL, 0, NULL, 0, 0 }
};
char buf[256];
size_t buf_l;
opensslv = provname = greeting = NULL;
if (c_get_params(hand, counter_request)) {
if (greeting) {
strcpy(buf, greeting);
} else {
const char *versionp = *(void **)counter_request[0].data;
const char *namep = *(void **)counter_request[1].data;
sprintf(buf, "Hello OpenSSL %.20s, greetings from %s!",
versionp, namep);
}
} else {
sprintf(buf, "Howdy stranger...");
}
p->return_size = buf_l = strlen(buf) + 1;
if (p->data_size >= buf_l)
strcpy(p->data, buf);
else
ok = 0;
}
}
return ok;
}
static const OSSL_ITEM *p_get_reason_strings(void *_)
{
static const OSSL_ITEM reason_strings[] = {
{1, "dummy reason string"},
{0, NULL}
};
return reason_strings;
}
static const OSSL_DISPATCH p_test_table[] = {
{ OSSL_FUNC_PROVIDER_GETTABLE_PARAMS, (void (*)(void))p_gettable_params },
{ OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))p_get_params },
{ OSSL_FUNC_PROVIDER_GET_REASON_STRINGS,
(void (*)(void))p_get_reason_strings},
{ 0, NULL }
};
int OSSL_provider_init(const OSSL_CORE_HANDLE *handle,
const OSSL_DISPATCH *in,
const OSSL_DISPATCH **out,
void **provctx)
{
for (; in->function_id != 0; in++) {
switch (in->function_id) {
case OSSL_FUNC_CORE_GETTABLE_PARAMS:
c_gettable_params = OSSL_get_core_gettable_params(in);
break;
case OSSL_FUNC_CORE_GET_PARAMS:
c_get_params = OSSL_get_core_get_params(in);
break;
default:
/* Just ignore anything we don't understand */
break;
}
}
/* Because we use this in get_params, we need to pass it back */
*provctx = (void *)handle;
*out = p_test_table;
return 1;
}
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