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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 "internal/nelem.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"
#include "endecoder_local.h"
static int read_pem(PROV_CTX *provctx, OSSL_CORE_BIO *cin,
char **pem_name, char **pem_header,
unsigned char **data, long *len)
{
BIO *in = bio_new_from_core_bio(provctx, cin);
int ok = (PEM_read_bio(in, pem_name, pem_header, data, len) > 0);
BIO_free(in);
return ok;
}
static OSSL_FUNC_decoder_newctx_fn pem2der_newctx;
static OSSL_FUNC_decoder_freectx_fn pem2der_freectx;
static OSSL_FUNC_decoder_gettable_params_fn pem2der_gettable_params;
static OSSL_FUNC_decoder_get_params_fn pem2der_get_params;
static OSSL_FUNC_decoder_decode_fn pem2der_decode;
/*
* Context used for PEM to DER decoding.
*/
struct pem2der_ctx_st {
PROV_CTX *provctx;
};
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;
OPENSSL_free(ctx);
}
static const OSSL_PARAM *pem2der_gettable_params(void *provctx)
{
static const OSSL_PARAM gettables[] = {
{ OSSL_DECODER_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_DECODER_PARAM_INPUT_TYPE);
if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "PEM"))
return 0;
return 1;
}
/* pem_password_cb compatible function */
struct pem2der_pass_data_st {
OSSL_PASSPHRASE_CALLBACK *cb;
void *cbarg;
};
static int pem2der_pass_helper(char *buf, int num, int w, void *data)
{
struct pem2der_pass_data_st *pass_data = data;
size_t plen;
if (pass_data == NULL
|| pass_data->cb == NULL
|| !pass_data->cb(buf, num, &plen, NULL, pass_data->cbarg))
return -1;
return (int)plen;
}
/*
* The selection parameter in pem2der_decode() is not used by this function
* because it's not relevant just to decode PEM to DER.
*/
static int pem2der_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
/* Strings to peal off the pem name */
static const char *pealable_pem_name_endings[] = {
/*
* These entries should be in longest to shortest order to avoid
* mixups.
*/
"ENCRYPTED PRIVATE KEY",
"PRIVATE KEY",
"PUBLIC KEY",
"PARAMETERS"
/*
* Libcrypto currently only supports decoding keys with provider side
* decoders, so we don't try to peal any other PEM name. That's an
* exercise for when libcrypto starts to treat other types of objects
* via providers.
*/
};
struct pem2der_ctx_st *ctx = vctx;
char *pem_name = NULL, *pem_header = NULL;
size_t pem_name_len, i;
unsigned char *der = NULL;
long der_len = 0;
int ok = 0;
if (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;
struct pem2der_pass_data_st pass_data;
pass_data.cb = pw_cb;
pass_data.cbarg = pw_cbarg;
if (!PEM_get_EVP_CIPHER_INFO(pem_header, &cipher)
|| !PEM_do_header(&cipher, der, &der_len,
pem2der_pass_helper, &pass_data))
goto end;
}
/*
* Peal off certain strings from the end of |pem_name|, as they serve
* no further purpose.
*/
for (i = 0, pem_name_len = strlen(pem_name);
i < OSSL_NELEM(pealable_pem_name_endings);
i++) {
size_t peal_len = strlen(pealable_pem_name_endings[i]);
size_t pem_name_offset;
if (peal_len <= pem_name_len) {
pem_name_offset = pem_name_len - peal_len;
if (strcmp(pem_name + pem_name_offset,
pealable_pem_name_endings[i]) == 0) {
do {
pem_name[pem_name_offset] = '\0';
} while (pem_name_offset > 0
&& pem_name[--pem_name_offset] == ' ');
if (pem_name[0] == '\0') {
OPENSSL_free(pem_name);
pem_name = NULL;
}
break;
}
}
}
{
OSSL_PARAM params[3], *p = params;
if (pem_name != NULL)
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
pem_name, 0);
*p++ =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
der, der_len);
*p = 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 ossl_pem_to_der_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))pem2der_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))pem2der_freectx },
{ OSSL_FUNC_DECODER_GETTABLE_PARAMS,
(void (*)(void))pem2der_gettable_params },
{ OSSL_FUNC_DECODER_GET_PARAMS,
(void (*)(void))pem2der_get_params },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))pem2der_decode },
{ 0, NULL }
};
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