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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2018-2020, Linaro Limited
*/
#include <assert.h>
#include <pkcs11_ta.h>
#include <string.h>
#include <string_ext.h>
#include <tee_internal_api_extensions.h>
#include <util.h>
#include "pkcs11_token.h"
#include "pkcs11_helpers.h"
#define PERSISTENT_OBJECT_ID_LEN 32
/*
* Token persistent objects
*/
static TEE_Result get_db_file_name(struct ck_token *token,
char *name, size_t size)
{
int n = snprintf(name, size, "token.db.%u", get_token_id(token));
if (n < 0 || (size_t)n >= size)
return TEE_ERROR_SECURITY;
else
return TEE_SUCCESS;
}
static TEE_Result open_db_file(struct ck_token *token,
TEE_ObjectHandle *out_hdl)
{
char file[PERSISTENT_OBJECT_ID_LEN] = { };
TEE_Result res = TEE_ERROR_GENERIC;
res = get_db_file_name(token, file, sizeof(file));
if (res)
return res;
return TEE_OpenPersistentObject(TEE_STORAGE_PRIVATE, file, sizeof(file),
TEE_DATA_FLAG_ACCESS_READ |
TEE_DATA_FLAG_ACCESS_WRITE,
out_hdl);
}
void update_persistent_db(struct ck_token *token)
{
TEE_Result res = TEE_ERROR_GENERIC;
TEE_ObjectHandle db_hdl = TEE_HANDLE_NULL;
res = open_db_file(token, &db_hdl);
if (res) {
EMSG("Failed to open token persistent db: %#"PRIx32, res);
TEE_Panic(0);
}
res = TEE_WriteObjectData(db_hdl, token->db_main,
sizeof(*token->db_main));
if (res) {
EMSG("Failed to write to token persistent db: %#"PRIx32, res);
TEE_Panic(0);
}
TEE_CloseObject(db_hdl);
}
static enum pkcs11_rc do_hash(uint32_t user, const uint8_t *pin,
size_t pin_size, uint32_t salt,
uint8_t hash[TEE_MAX_HASH_SIZE])
{
TEE_Result res = TEE_SUCCESS;
TEE_OperationHandle oh = TEE_HANDLE_NULL;
uint32_t sz = TEE_MAX_HASH_SIZE;
res = TEE_AllocateOperation(&oh, TEE_ALG_SHA256, TEE_MODE_DIGEST, 0);
if (res)
return tee2pkcs_error(res);
TEE_DigestUpdate(oh, &user, sizeof(user));
TEE_DigestUpdate(oh, &salt, sizeof(salt));
res = TEE_DigestDoFinal(oh, pin, pin_size, hash, &sz);
TEE_FreeOperation(oh);
if (res)
return PKCS11_CKR_GENERAL_ERROR;
memset(hash + sz, 0, TEE_MAX_HASH_SIZE - sz);
return PKCS11_CKR_OK;
}
enum pkcs11_rc hash_pin(enum pkcs11_user_type user, const uint8_t *pin,
size_t pin_size, uint32_t *salt,
uint8_t hash[TEE_MAX_HASH_SIZE])
{
enum pkcs11_rc rc = PKCS11_CKR_OK;
uint32_t s = 0;
TEE_GenerateRandom(&s, sizeof(s));
if (!s)
s++;
rc = do_hash(user, pin, pin_size, s, hash);
if (!rc)
*salt = s;
return rc;
}
enum pkcs11_rc verify_pin(enum pkcs11_user_type user, const uint8_t *pin,
size_t pin_size, uint32_t salt,
const uint8_t hash[TEE_MAX_HASH_SIZE])
{
uint8_t tmp_hash[TEE_MAX_HASH_SIZE] = { 0 };
enum pkcs11_rc rc = PKCS11_CKR_OK;
rc = do_hash(user, pin, pin_size, salt, tmp_hash);
if (rc)
return rc;
if (buf_compare_ct(tmp_hash, hash, TEE_MAX_HASH_SIZE))
rc = PKCS11_CKR_PIN_INCORRECT;
return rc;
}
/*
* Release resources relate to persistent database
*/
void close_persistent_db(struct ck_token *token __unused)
{
}
/*
* Return the token instance, either initialized from reset or initialized
* from the token persistent state if found.
*/
struct ck_token *init_persistent_db(unsigned int token_id)
{
struct ck_token *token = get_token(token_id);
TEE_Result res = TEE_ERROR_GENERIC;
TEE_ObjectHandle db_hdl = TEE_HANDLE_NULL;
/* Copy persistent database: main db and object db */
struct token_persistent_main *db_main = NULL;
if (!token)
return NULL;
db_main = TEE_Malloc(sizeof(*db_main), TEE_MALLOC_FILL_ZERO);
if (!db_main)
goto error;
res = open_db_file(token, &db_hdl);
if (res == TEE_SUCCESS) {
uint32_t size = 0;
IMSG("PKCS11 token %u: load db", token_id);
size = sizeof(*db_main);
res = TEE_ReadObjectData(db_hdl, db_main, size, &size);
if (res || size != sizeof(*db_main))
TEE_Panic(0);
} else if (res == TEE_ERROR_ITEM_NOT_FOUND) {
char file[PERSISTENT_OBJECT_ID_LEN] = { };
IMSG("PKCS11 token %u: init db", token_id);
TEE_MemFill(db_main, 0, sizeof(*db_main));
TEE_MemFill(db_main->label, '*', sizeof(db_main->label));
db_main->flags = PKCS11_CKFT_SO_PIN_TO_BE_CHANGED |
PKCS11_CKFT_USER_PIN_TO_BE_CHANGED |
PKCS11_CKFT_RNG |
PKCS11_CKFT_DUAL_CRYPTO_OPERATIONS |
PKCS11_CKFT_LOGIN_REQUIRED;
res = get_db_file_name(token, file, sizeof(file));
if (res)
TEE_Panic(0);
res = TEE_CreatePersistentObject(TEE_STORAGE_PRIVATE,
file, sizeof(file),
TEE_DATA_FLAG_ACCESS_READ |
TEE_DATA_FLAG_ACCESS_WRITE,
TEE_HANDLE_NULL,
db_main, sizeof(*db_main),
&db_hdl);
if (res) {
EMSG("Failed to create db: %"PRIx32, res);
goto error;
}
} else {
goto error;
}
token->db_main = db_main;
TEE_CloseObject(db_hdl);
return token;
error:
TEE_Free(db_main);
if (db_hdl != TEE_HANDLE_NULL)
TEE_CloseObject(db_hdl);
return NULL;
}
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