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/*
* Copyright 2020-2021 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/core_object.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/pem.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "prov/bio.h"
#include "prov/implementations.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 = ossl_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_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);
}
/* 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 peel off the pem name */
static struct peelablee_pem_name_endings_st {
const char *ending;
const char *data_structure;
} peelable_pem_name_endings[] = {
/*
* These entries should be in longest to shortest order to avoid
* mixups.
*/
{ "ENCRYPTED PRIVATE KEY", "pkcs8" },
{ "PRIVATE KEY", "pkcs8" },
{ "PUBLIC KEY", "SubjectPublicKeyInfo" },
{ "PARAMETERS", NULL }
/*
* Libcrypto currently only supports decoding keys with provider side
* decoders, so we don't try to peel 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;
int objtype = OSSL_OBJECT_UNKNOWN;
const char *data_structure = NULL;
ok = read_pem(ctx->provctx, cin, &pem_name, &pem_header,
&der, &der_len) > 0;
/* We return "empty handed". This is not an error. */
if (!ok)
return 1;
/*
* 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;
ok = 0; /* Assume that we fail */
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;
}
/*
* Indicated that we successfully decoded something, or not at all.
* Ending up "empty handed" is not an error.
*/
ok = 1;
/*
* 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(peelable_pem_name_endings);
i++) {
size_t peel_len = strlen(peelable_pem_name_endings[i].ending);
size_t pem_name_offset;
if (peel_len <= pem_name_len) {
pem_name_offset = pem_name_len - peel_len;
if (strcmp(pem_name + pem_name_offset,
peelable_pem_name_endings[i].ending) == 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;
}
/* All of these peelable endings are for EVP_PKEYs */
objtype = OSSL_OBJECT_PKEY;
if (pem_name == NULL) {
data_structure = peelable_pem_name_endings[i].data_structure;
if (data_structure == NULL)
goto end;
} else {
/*
* If there is an algorithm name prefix then it is a
* type-specific data structure
*/
data_structure = "type-specific";
}
break;
}
}
}
/* If we don't know the object type yet check if it's one we know about */
if (objtype == OSSL_OBJECT_UNKNOWN) {
if (strcmp(pem_name, PEM_STRING_X509) == 0
|| strcmp(pem_name, PEM_STRING_X509_TRUSTED) == 0
|| strcmp(pem_name, PEM_STRING_X509_OLD) == 0)
objtype = OSSL_OBJECT_CERT;
else if (strcmp(pem_name, PEM_STRING_X509_CRL) == 0)
objtype = OSSL_OBJECT_CRL;
}
{
OSSL_PARAM params[5], *p = params;
if (pem_name != NULL)
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
pem_name, 0);
/* We expect this to be read only so casting away the const is ok */
if (data_structure != NULL)
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
(char *)data_structure, 0);
*p++ =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
der, der_len);
*p++ =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
*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_DECODE, (void (*)(void))pem2der_decode },
{ 0, NULL }
};
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