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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2017-2020, Linaro Limited
*/
#include <assert.h>
#include <compiler.h>
#include <pkcs11_ta.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <string_ext.h>
#include <tee_internal_api.h>
#include <tee_internal_api_extensions.h>
#include <trace.h>
#include <util.h>
#include "attributes.h"
#include "pkcs11_helpers.h"
#include "serializer.h"
enum pkcs11_rc init_attributes_head(struct obj_attrs **head)
{
*head = TEE_Malloc(sizeof(**head), TEE_MALLOC_FILL_ZERO);
if (!*head)
return PKCS11_CKR_DEVICE_MEMORY;
return PKCS11_CKR_OK;
}
enum pkcs11_rc add_attribute(struct obj_attrs **head, uint32_t attribute,
void *data, size_t size)
{
size_t buf_len = sizeof(struct obj_attrs) + (*head)->attrs_size;
char **bstart = (void *)head;
enum pkcs11_rc rc = PKCS11_CKR_OK;
uint32_t data32 = 0;
data32 = attribute;
rc = serialize(bstart, &buf_len, &data32, sizeof(uint32_t));
if (rc)
return rc;
data32 = size;
rc = serialize(bstart, &buf_len, &data32, sizeof(uint32_t));
if (rc)
return rc;
rc = serialize(bstart, &buf_len, data, size);
if (rc)
return rc;
/* Alloced buffer is always well aligned */
head = (void *)bstart;
(*head)->attrs_size += 2 * sizeof(uint32_t) + size;
(*head)->attrs_count++;
return rc;
}
void get_attribute_ptrs(struct obj_attrs *head, uint32_t attribute,
void **attr, uint32_t *attr_size, size_t *count)
{
char *cur = (char *)head + sizeof(struct obj_attrs);
char *end = cur + head->attrs_size;
size_t next_off = 0;
size_t max_found = *count;
size_t found = 0;
void **attr_ptr = attr;
uint32_t *attr_size_ptr = attr_size;
for (; cur < end; cur += next_off) {
/* Structure aligned copy of the pkcs11_ref in the object */
struct pkcs11_attribute_head pkcs11_ref = { };
TEE_MemMove(&pkcs11_ref, cur, sizeof(pkcs11_ref));
next_off = sizeof(pkcs11_ref) + pkcs11_ref.size;
if (pkcs11_ref.id != attribute)
continue;
found++;
if (!max_found)
continue; /* only count matching attributes */
if (attr)
*attr_ptr++ = cur + sizeof(pkcs11_ref);
if (attr_size)
*attr_size_ptr++ = pkcs11_ref.size;
if (found == max_found)
break;
}
/* Sanity */
if (cur > end) {
DMSG("Exceeding serial object length");
TEE_Panic(0);
}
*count = found;
}
enum pkcs11_rc get_attribute_ptr(struct obj_attrs *head, uint32_t attribute,
void **attr_ptr, uint32_t *attr_size)
{
size_t count = 1;
get_attribute_ptrs(head, attribute, attr_ptr, attr_size, &count);
if (!count)
return PKCS11_RV_NOT_FOUND;
if (count != 1)
return PKCS11_CKR_GENERAL_ERROR;
return PKCS11_CKR_OK;
}
enum pkcs11_rc get_attribute(struct obj_attrs *head, uint32_t attribute,
void *attr, uint32_t *attr_size)
{
enum pkcs11_rc rc = PKCS11_CKR_OK;
void *attr_ptr = NULL;
uint32_t size = 0;
rc = get_attribute_ptr(head, attribute, &attr_ptr, &size);
if (rc)
return rc;
if (attr_size && *attr_size != size) {
*attr_size = size;
/* This reuses buffer-to-small for any bad size matching */
return PKCS11_CKR_BUFFER_TOO_SMALL;
}
if (attr)
TEE_MemMove(attr, attr_ptr, size);
if (attr_size)
*attr_size = size;
return PKCS11_CKR_OK;
}
bool get_bool(struct obj_attrs *head, uint32_t attribute)
{
enum pkcs11_rc rc = PKCS11_CKR_OK;
uint8_t bbool = 0;
uint32_t size = sizeof(bbool);
rc = get_attribute(head, attribute, &bbool, &size);
if (rc == PKCS11_RV_NOT_FOUND)
return false;
assert(rc == PKCS11_CKR_OK);
return bbool;
}
#if CFG_TEE_TA_LOG_LEVEL > 0
/*
* Debug: dump CK attribute array to output trace
*/
#define ATTR_TRACE_FMT "%s attr %s / %s\t(0x%04"PRIx32" %"PRIu32"-byte"
#define ATTR_FMT_0BYTE ATTR_TRACE_FMT ")"
#define ATTR_FMT_1BYTE ATTR_TRACE_FMT ": %02x)"
#define ATTR_FMT_2BYTE ATTR_TRACE_FMT ": %02x %02x)"
#define ATTR_FMT_3BYTE ATTR_TRACE_FMT ": %02x %02x %02x)"
#define ATTR_FMT_4BYTE ATTR_TRACE_FMT ": %02x %02x %02x %02x)"
#define ATTR_FMT_ARRAY ATTR_TRACE_FMT ": %02x %02x %02x %02x ...)"
static void __trace_attributes(char *prefix, void *src, void *end)
{
size_t next_off = 0;
char *prefix2 = NULL;
size_t prefix_len = strlen(prefix);
char *cur = src;
/* append 4 spaces to the prefix plus terminal '\0' */
prefix2 = TEE_Malloc(prefix_len + 1 + 4, TEE_MALLOC_FILL_ZERO);
if (!prefix2)
return;
TEE_MemMove(prefix2, prefix, prefix_len + 1);
TEE_MemFill(prefix2 + prefix_len, ' ', 4);
*(prefix2 + prefix_len + 4) = '\0';
for (; cur < (char *)end; cur += next_off) {
struct pkcs11_attribute_head pkcs11_ref = { };
uint8_t data[4] = { 0 };
TEE_MemMove(&pkcs11_ref, cur, sizeof(pkcs11_ref));
TEE_MemMove(&data[0], cur + sizeof(pkcs11_ref),
MIN(pkcs11_ref.size, sizeof(data)));
next_off = sizeof(pkcs11_ref) + pkcs11_ref.size;
switch (pkcs11_ref.size) {
case 0:
IMSG_RAW(ATTR_FMT_0BYTE,
prefix, id2str_attr(pkcs11_ref.id), "*",
pkcs11_ref.id, pkcs11_ref.size);
break;
case 1:
IMSG_RAW(ATTR_FMT_1BYTE,
prefix, id2str_attr(pkcs11_ref.id),
id2str_attr_value(pkcs11_ref.id,
pkcs11_ref.size,
cur + sizeof(pkcs11_ref)),
pkcs11_ref.id, pkcs11_ref.size, data[0]);
break;
case 2:
IMSG_RAW(ATTR_FMT_2BYTE,
prefix, id2str_attr(pkcs11_ref.id),
id2str_attr_value(pkcs11_ref.id,
pkcs11_ref.size,
cur + sizeof(pkcs11_ref)),
pkcs11_ref.id, pkcs11_ref.size, data[0],
data[1]);
break;
case 3:
IMSG_RAW(ATTR_FMT_3BYTE,
prefix, id2str_attr(pkcs11_ref.id),
id2str_attr_value(pkcs11_ref.id,
pkcs11_ref.size,
cur + sizeof(pkcs11_ref)),
pkcs11_ref.id, pkcs11_ref.size,
data[0], data[1], data[2]);
break;
case 4:
IMSG_RAW(ATTR_FMT_4BYTE,
prefix, id2str_attr(pkcs11_ref.id),
id2str_attr_value(pkcs11_ref.id,
pkcs11_ref.size,
cur + sizeof(pkcs11_ref)),
pkcs11_ref.id, pkcs11_ref.size,
data[0], data[1], data[2], data[3]);
break;
default:
IMSG_RAW(ATTR_FMT_ARRAY,
prefix, id2str_attr(pkcs11_ref.id),
id2str_attr_value(pkcs11_ref.id,
pkcs11_ref.size,
cur + sizeof(pkcs11_ref)),
pkcs11_ref.id, pkcs11_ref.size,
data[0], data[1], data[2], data[3]);
break;
}
switch (pkcs11_ref.id) {
case PKCS11_CKA_WRAP_TEMPLATE:
case PKCS11_CKA_UNWRAP_TEMPLATE:
case PKCS11_CKA_DERIVE_TEMPLATE:
trace_attributes(prefix2, cur + sizeof(pkcs11_ref));
break;
default:
break;
}
}
/* Sanity */
if (cur != end)
EMSG("Warning: unexpected alignment in object attributes");
TEE_Free(prefix2);
}
void trace_attributes(const char *prefix, void *ref)
{
struct obj_attrs head;
char *pre = NULL;
TEE_MemMove(&head, ref, sizeof(head));
pre = TEE_Malloc(prefix ? strlen(prefix) + 2 : 2, TEE_MALLOC_FILL_ZERO);
if (!pre) {
EMSG("%s: out of memory", prefix);
return;
}
if (prefix)
TEE_MemMove(pre, prefix, strlen(prefix));
IMSG_RAW("%s,--- (serial object) Attributes list --------", pre);
IMSG_RAW("%s| %"PRIu32" item(s) - %"PRIu32" bytes",
pre, head.attrs_count, head.attrs_size);
pre[prefix ? strlen(prefix) : 0] = '|';
__trace_attributes(pre, (char *)ref + sizeof(head),
(char *)ref + sizeof(head) + head.attrs_size);
IMSG_RAW("%s`-----------------------", prefix ? prefix : "");
TEE_Free(pre);
}
#endif /*CFG_TEE_TA_LOG_LEVEL*/
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