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/*
* Copyright 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
*/
/*
* RSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <string.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/pem.h>
#include "prov/bio.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"
#include "serializer_local.h"
static OSSL_FUNC_deserializer_newctx_fn pem2der_newctx;
static OSSL_FUNC_deserializer_freectx_fn pem2der_freectx;
static OSSL_FUNC_deserializer_gettable_params_fn pem2der_gettable_params;
static OSSL_FUNC_deserializer_get_params_fn pem2der_get_params;
static OSSL_FUNC_deserializer_deserialize_fn pem2der_deserialize;
/*
* Context used for PEM to DER deserialization.
*/
struct pem2der_ctx_st {
PROV_CTX *provctx;
/* Set to 1 if intending to encrypt/decrypt, otherwise 0 */
int cipher_intent;
EVP_CIPHER *cipher;
/* Passphrase that was passed by the caller */
void *cipher_pass;
size_t cipher_pass_length;
/* This callback is only used if |cipher_pass| is NULL */
OSSL_PASSPHRASE_CALLBACK *cb;
void *cbarg;
};
static void *pem2der_newctx(void *provctx)
{
struct pem2der_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void pem2der_freectx(void *vctx)
{
struct pem2der_ctx_st *ctx = vctx;
EVP_CIPHER_free(ctx->cipher);
OPENSSL_clear_free(ctx->cipher_pass, ctx->cipher_pass_length);
OPENSSL_free(ctx);
}
static const OSSL_PARAM *pem2der_gettable_params(void)
{
static const OSSL_PARAM gettables[] = {
{ OSSL_DESERIALIZER_PARAM_INPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
OSSL_PARAM_END,
};
return gettables;
}
static int pem2der_get_params(OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_DESERIALIZER_PARAM_INPUT_TYPE);
if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "PEM"))
return 0;
return 1;
}
static const OSSL_PARAM *pem2der_settable_ctx_params(void)
{
static const OSSL_PARAM settables[] = {
OSSL_PARAM_octet_string(OSSL_DESERIALIZER_PARAM_PASS, NULL, 0),
OSSL_PARAM_END,
};
return settables;
}
static int pem2der_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
struct pem2der_ctx_st *ctx = vctx;
const OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate_const(params, OSSL_DESERIALIZER_PARAM_PASS))
!= NULL) {
OPENSSL_clear_free(ctx->cipher_pass, ctx->cipher_pass_length);
ctx->cipher_pass = NULL;
if (!OSSL_PARAM_get_octet_string(p, &ctx->cipher_pass, 0,
&ctx->cipher_pass_length))
return 0;
}
return 1;
}
/* pem_password_cb compatible function */
static int pem2der_pass_helper(char *buf, int num, int w, void *data)
{
struct pem2der_ctx_st *ctx = data;
size_t plen;
if (ctx->cipher_pass != NULL) {
if (ctx->cipher_pass_length < (size_t)num - 1) {
strncpy(buf, ctx->cipher_pass, ctx->cipher_pass_length);
buf[ctx->cipher_pass_length] = '\0';
} else {
OPENSSL_strlcpy(buf, ctx->cipher_pass, num);
}
} else if (ctx->cb == NULL
|| !ctx->cb(buf, num, &plen, NULL, ctx->cbarg)) {
return -1;
}
return (int)ctx->cipher_pass_length;
}
static int pem2der_deserialize(void *vctx, OSSL_CORE_BIO *cin,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct pem2der_ctx_st *ctx = vctx;
char *pem_name = NULL, *pem_header = NULL;
unsigned char *der = NULL;
long der_len = 0;
int ok = 0;
if (ossl_prov_read_pem(ctx->provctx, cin, &pem_name, &pem_header,
&der, &der_len) <= 0)
return 0;
/*
* 10 is the number of characters in "Proc-Type:", which
* PEM_get_EVP_CIPHER_INFO() requires to be present.
* If the PEM header has less characters than that, it's
* not worth spending cycles on it.
*/
if (strlen(pem_header) > 10) {
EVP_CIPHER_INFO cipher;
if (!PEM_get_EVP_CIPHER_INFO(pem_header, &cipher)
|| !PEM_do_header(&cipher, der, &der_len, pem2der_pass_helper, ctx))
goto end;
}
{
OSSL_PARAM params[3];
params[0] =
OSSL_PARAM_construct_utf8_string(OSSL_DESERIALIZER_PARAM_DATA_TYPE,
pem_name, 0);
params[1] =
OSSL_PARAM_construct_octet_string(OSSL_DESERIALIZER_PARAM_DATA,
der, der_len);
params[2] = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
end:
OPENSSL_free(pem_name);
OPENSSL_free(pem_header);
OPENSSL_free(der);
return ok;
}
const OSSL_DISPATCH pem_to_der_deserializer_functions[] = {
{ OSSL_FUNC_DESERIALIZER_NEWCTX, (void (*)(void))pem2der_newctx },
{ OSSL_FUNC_DESERIALIZER_FREECTX, (void (*)(void))pem2der_freectx },
{ OSSL_FUNC_DESERIALIZER_GETTABLE_PARAMS,
(void (*)(void))pem2der_gettable_params },
{ OSSL_FUNC_DESERIALIZER_GET_PARAMS,
(void (*)(void))pem2der_get_params },
{ OSSL_FUNC_DESERIALIZER_SETTABLE_CTX_PARAMS,
(void (*)(void))pem2der_settable_ctx_params },
{ OSSL_FUNC_DESERIALIZER_SET_CTX_PARAMS,
(void (*)(void))pem2der_set_ctx_params },
{ OSSL_FUNC_DESERIALIZER_DESERIALIZE, (void (*)(void))pem2der_deserialize },
{ 0, NULL }
};
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