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/* Copyright (C) 2023 James Bottomley <James.Bottomley@HansenPartnership.com>
*
* SPDX-License-Identifier: LGPL-2.1-only
*/
#include "provider.h"
static int tpm2_pem_decode(void *ctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
int ret = 1; /* carry on decoding, even if we can't decode this */
OSSL_LIB_CTX *libctx = ctx;
BIO *in = BIO_new_from_core_bio(libctx, cin);
unsigned char *der_data;
long der_len;
char *pem_name, *pem_header;
OSSL_PARAM params[3];
if (!in)
/* stop decoding */
return 0;
if (PEM_read_bio(in, &pem_name, &pem_header, &der_data, &der_len) <= 0)
goto out;
if (strcmp(pem_name, TSSPRIVKEY_PEM_STRING) != 0 &&
strcmp(pem_name, TSSLOADABLE_PEM_STRING) != 0)
goto out;
params[0] = OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
der_data, der_len);
params[1] = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
"TPM2", 0);
params[2] = OSSL_PARAM_construct_end();
ret = data_cb(params, data_cbarg);
out:
OPENSSL_free(pem_name);
OPENSSL_free(pem_header);
OPENSSL_free(der_data);
BIO_free(in);
return ret;
}
static int tpm2_pkey_decode(void *ctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg,
TPM_ALG_ID alg)
{
struct app_data *ad = tpm2_keymgmt_new(ctx);
OSSL_LIB_CTX *libctx = ctx;
BIO *in = BIO_new_from_core_bio(libctx, cin);
int ret = 0;
OSSL_PARAM params[4];
int type;
char *keytype;
if (!ad || !in) {
BIO_free(in);
OPENSSL_free(ad);
return 0;
}
ret = tpm2_load_bf(in, ad, NULL);
BIO_free(in);
if (!ret)
goto out_free;
ret = 1;
if (ad->Public.publicArea.type != alg)
goto out_free;
if (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) {
if (!ad->empty_auth) {
char pass[SHA512_DIGEST_LENGTH];
size_t len;
if (!pw_cb(pass, sizeof(pass), &len, NULL, pw_cbarg))
goto out_free;
ad->auth = OPENSSL_malloc(len + 1);
if (!ad->auth)
goto out_free;
memcpy(ad->auth, pass, len);
ad->auth[len] = '\0';
OPENSSL_cleanse(pass, len);
}
} else {
OPENSSL_free(ad->priv);
ad->priv = NULL;
}
type = OSSL_OBJECT_PKEY;
keytype = alg == TPM_ALG_RSA ? "RSA" : "EC";
params[0] = OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE,
&type);
params[1] = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
keytype, 0);
params[2] = OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
&ad, sizeof(ad));
params[3] = OSSL_PARAM_construct_end();
ret = data_cb(params, data_cbarg);
if (ret)
/* here the key must not be freed. It is freed
* instead by keymgmt_free once all references are
* dropped */
return ret;
out_free:
tpm2_delete(ad);
return ret;
}
static int tpm2_rsa_decode(void *ctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
return tpm2_pkey_decode(ctx, cin, selection, data_cb, data_cbarg,
pw_cb, pw_cbarg, TPM_ALG_RSA);
}
static int tpm2_ec_decode(void *ctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
return tpm2_pkey_decode(ctx, cin, selection, data_cb, data_cbarg,
pw_cb, pw_cbarg, TPM_ALG_ECC);
}
static int
tpm2_encode_text(void *ctx, OSSL_CORE_BIO *cout, const void *key,
const OSSL_PARAM key_abstract[], int selection,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
OSSL_LIB_CTX *libctx = ctx;
BIO *out = BIO_new_from_core_bio(libctx, cout);
const struct app_data *ad = key;
if (!out)
return 0;
BIO_printf(out, "TPM %s key, parent=%08x\n",
ad->Public.publicArea.type == TPM_ALG_RSA ? "RSA" : "EC",
ad->parent);
BIO_free(out);
return 1;
}
static const OSSL_DISPATCH encode_text_fns[] = {
{ OSSL_FUNC_ENCODER_NEWCTX, (void (*)(void))tpm2_passthrough_newctx },
{ OSSL_FUNC_ENCODER_FREECTX, (void (*)(void))tpm2_passthrough_freectx },
{ OSSL_FUNC_ENCODER_ENCODE, (void (*)(void))tpm2_encode_text },
{ 0, NULL }
};
static const OSSL_DISPATCH decode_pem_fns[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))tpm2_passthrough_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))tpm2_passthrough_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))tpm2_pem_decode },
{ 0, NULL }
};
static const OSSL_DISPATCH decode_rsa_fns[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))tpm2_passthrough_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))tpm2_passthrough_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))tpm2_rsa_decode },
{ 0, NULL }
};
static const OSSL_DISPATCH decode_ec_fns[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))tpm2_passthrough_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))tpm2_passthrough_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))tpm2_ec_decode },
{ 0, NULL }
};
/* only provide pretty print encoders. All other key saves
* are done by keymgmt export (which means only public keys) */
const OSSL_ALGORITHM encoders[] = {
{ "RSA", "provider=tpm2,output=text", encode_text_fns },
{ "EC", "provider=tpm2,output=text", encode_text_fns },
{ NULL, NULL, NULL }
};
const OSSL_ALGORITHM decoders[] = {
{ "DER", "provider=tpm2,input=pem", decode_pem_fns },
{ "RSA", "provider=tpm2,input=der,structure=TPM2", decode_rsa_fns },
{ "EC", "provider=tpm2,input=der,structure=TPM2", decode_ec_fns },
{ NULL, NULL, NULL }
};
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