d677bfe2f7
There are no changes in this commit but a new organization of the code
as follow.
* cmd/ directory:
> move existing code from cmd/tpm.c in cmd/tpm-common.c
> move specific code in cmd/tpm-v1.c
> create a specific header file with generic definitions for
commands only called cmd/tpm-user-utils.h
* lib/ directory:
> move existing code from lib/tpm.c in lib/tpm-common.c
> move specific code in lib/tpm-v1.c
> create a specific header file with generic definitions for
the library itself called lib/tpm-utils.h
* include/ directory:
> move existing code from include/tpm.h in include/tpm-common.h
> move specific code in include/tpm-v1.h
Code designated as 'common' is compiled if TPM are used. Code designated
as 'specific' is compiled only if the right specification has been
selected.
All files include tpm-common.h.
Files in cmd/ include tpm-user-utils.h.
Files in lib/ include tpm-utils.h.
Depending on the specification, files may include either (not both)
tpm-v1.h or tpm-v2.h.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
[trini: Fix a few more cases of tpm.h -> tpm-v1.h, some Kconfig logic]
Signed-off-by: Tom Rini <trini@konsulko.com>
853 lines
24 KiB
C
853 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2013 The Chromium OS Authors.
|
|
* Coypright (c) 2013 Guntermann & Drunck GmbH
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <asm/unaligned.h>
|
|
#include <u-boot/sha1.h>
|
|
#include <tpm-common.h>
|
|
#include <tpm-v1.h>
|
|
#include "tpm-utils.h"
|
|
|
|
#ifdef CONFIG_TPM_AUTH_SESSIONS
|
|
|
|
#ifndef CONFIG_SHA1
|
|
#error "TPM_AUTH_SESSIONS require SHA1 to be configured, too"
|
|
#endif /* !CONFIG_SHA1 */
|
|
|
|
struct session_data {
|
|
int valid;
|
|
u32 handle;
|
|
u8 nonce_even[DIGEST_LENGTH];
|
|
u8 nonce_odd[DIGEST_LENGTH];
|
|
};
|
|
|
|
static struct session_data oiap_session = {0, };
|
|
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
|
|
u32 tpm_startup(enum tpm_startup_type mode)
|
|
{
|
|
const u8 command[12] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x0,
|
|
};
|
|
const size_t mode_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE];
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sw",
|
|
0, command, sizeof(command),
|
|
mode_offset, mode))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return tpm_sendrecv_command(buf, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_self_test_full(void)
|
|
{
|
|
const u8 command[10] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x50,
|
|
};
|
|
return tpm_sendrecv_command(command, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_continue_self_test(void)
|
|
{
|
|
const u8 command[10] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x53,
|
|
};
|
|
return tpm_sendrecv_command(command, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_nv_define_space(u32 index, u32 perm, u32 size)
|
|
{
|
|
const u8 command[101] = {
|
|
0x0, 0xc1, /* TPM_TAG */
|
|
0x0, 0x0, 0x0, 0x65, /* parameter size */
|
|
0x0, 0x0, 0x0, 0xcc, /* TPM_COMMAND_CODE */
|
|
/* TPM_NV_DATA_PUBLIC->... */
|
|
0x0, 0x18, /* ...->TPM_STRUCTURE_TAG */
|
|
0, 0, 0, 0, /* ...->TPM_NV_INDEX */
|
|
/* TPM_NV_DATA_PUBLIC->TPM_PCR_INFO_SHORT */
|
|
0x0, 0x3,
|
|
0, 0, 0,
|
|
0x1f,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
/* TPM_NV_DATA_PUBLIC->TPM_PCR_INFO_SHORT */
|
|
0x0, 0x3,
|
|
0, 0, 0,
|
|
0x1f,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
/* TPM_NV_ATTRIBUTES->... */
|
|
0x0, 0x17, /* ...->TPM_STRUCTURE_TAG */
|
|
0, 0, 0, 0, /* ...->attributes */
|
|
/* End of TPM_NV_ATTRIBUTES */
|
|
0, /* bReadSTClear */
|
|
0, /* bWriteSTClear */
|
|
0, /* bWriteDefine */
|
|
0, 0, 0, 0, /* size */
|
|
};
|
|
const size_t index_offset = 12;
|
|
const size_t perm_offset = 70;
|
|
const size_t size_offset = 77;
|
|
u8 buf[COMMAND_BUFFER_SIZE];
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sddd",
|
|
0, command, sizeof(command),
|
|
index_offset, index,
|
|
perm_offset, perm,
|
|
size_offset, size))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return tpm_sendrecv_command(buf, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_nv_read_value(u32 index, void *data, u32 count)
|
|
{
|
|
const u8 command[22] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0x16, 0x0, 0x0, 0x0, 0xcf,
|
|
};
|
|
const size_t index_offset = 10;
|
|
const size_t length_offset = 18;
|
|
const size_t data_size_offset = 10;
|
|
const size_t data_offset = 14;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 data_size;
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sdd",
|
|
0, command, sizeof(command),
|
|
index_offset, index,
|
|
length_offset, count))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
data_size_offset, &data_size))
|
|
return TPM_LIB_ERROR;
|
|
if (data_size > count)
|
|
return TPM_LIB_ERROR;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
data_offset, data, data_size))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_nv_write_value(u32 index, const void *data, u32 length)
|
|
{
|
|
const u8 command[256] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xcd,
|
|
};
|
|
const size_t command_size_offset = 2;
|
|
const size_t index_offset = 10;
|
|
const size_t length_offset = 18;
|
|
const size_t data_offset = 22;
|
|
const size_t write_info_size = 12;
|
|
const u32 total_length =
|
|
TPM_REQUEST_HEADER_LENGTH + write_info_size + length;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sddds",
|
|
0, command, sizeof(command),
|
|
command_size_offset, total_length,
|
|
index_offset, index,
|
|
length_offset, length,
|
|
data_offset, data, length))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_extend(u32 index, const void *in_digest, void *out_digest)
|
|
{
|
|
const u8 command[34] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0x22, 0x0, 0x0, 0x0, 0x14,
|
|
};
|
|
const size_t index_offset = 10;
|
|
const size_t in_digest_offset = 14;
|
|
const size_t out_digest_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE];
|
|
u8 response[TPM_RESPONSE_HEADER_LENGTH + PCR_DIGEST_LENGTH];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sds",
|
|
0, command, sizeof(command),
|
|
index_offset, index,
|
|
in_digest_offset, in_digest,
|
|
PCR_DIGEST_LENGTH))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
out_digest_offset, out_digest,
|
|
PCR_DIGEST_LENGTH))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_pcr_read(u32 index, void *data, size_t count)
|
|
{
|
|
const u8 command[14] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xe, 0x0, 0x0, 0x0, 0x15,
|
|
};
|
|
const size_t index_offset = 10;
|
|
const size_t out_digest_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (count < PCR_DIGEST_LENGTH)
|
|
return TPM_LIB_ERROR;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sd",
|
|
0, command, sizeof(command),
|
|
index_offset, index))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
out_digest_offset, data, PCR_DIGEST_LENGTH))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_tsc_physical_presence(u16 presence)
|
|
{
|
|
const u8 command[12] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x40, 0x0, 0x0, 0xa, 0x0, 0x0,
|
|
};
|
|
const size_t presence_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE];
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sw",
|
|
0, command, sizeof(command),
|
|
presence_offset, presence))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return tpm_sendrecv_command(buf, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_read_pubek(void *data, size_t count)
|
|
{
|
|
const u8 command[30] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0x1e, 0x0, 0x0, 0x0, 0x7c,
|
|
};
|
|
const size_t response_size_offset = 2;
|
|
const size_t data_offset = 10;
|
|
const size_t header_and_checksum_size = TPM_RESPONSE_HEADER_LENGTH + 20;
|
|
u8 response[COMMAND_BUFFER_SIZE + TPM_PUBEK_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 data_size;
|
|
u32 err;
|
|
|
|
err = tpm_sendrecv_command(command, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
response_size_offset, &data_size))
|
|
return TPM_LIB_ERROR;
|
|
if (data_size < header_and_checksum_size)
|
|
return TPM_LIB_ERROR;
|
|
data_size -= header_and_checksum_size;
|
|
if (data_size > count)
|
|
return TPM_LIB_ERROR;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
data_offset, data, data_size))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_force_clear(void)
|
|
{
|
|
const u8 command[10] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x5d,
|
|
};
|
|
|
|
return tpm_sendrecv_command(command, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_physical_enable(void)
|
|
{
|
|
const u8 command[10] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x6f,
|
|
};
|
|
|
|
return tpm_sendrecv_command(command, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_physical_disable(void)
|
|
{
|
|
const u8 command[10] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x70,
|
|
};
|
|
|
|
return tpm_sendrecv_command(command, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_physical_set_deactivated(u8 state)
|
|
{
|
|
const u8 command[11] = {
|
|
0x0, 0xc1, 0x0, 0x0, 0x0, 0xb, 0x0, 0x0, 0x0, 0x72,
|
|
};
|
|
const size_t state_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE];
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sb",
|
|
0, command, sizeof(command),
|
|
state_offset, state))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return tpm_sendrecv_command(buf, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_get_capability(u32 cap_area, u32 sub_cap, void *cap, size_t count)
|
|
{
|
|
const u8 command[22] = {
|
|
0x0, 0xc1, /* TPM_TAG */
|
|
0x0, 0x0, 0x0, 0x16, /* parameter size */
|
|
0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */
|
|
0x0, 0x0, 0x0, 0x0, /* TPM_CAPABILITY_AREA */
|
|
0x0, 0x0, 0x0, 0x4, /* subcap size */
|
|
0x0, 0x0, 0x0, 0x0, /* subcap value */
|
|
};
|
|
const size_t cap_area_offset = 10;
|
|
const size_t sub_cap_offset = 18;
|
|
const size_t cap_offset = 14;
|
|
const size_t cap_size_offset = 10;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 cap_size;
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sdd",
|
|
0, command, sizeof(command),
|
|
cap_area_offset, cap_area,
|
|
sub_cap_offset, sub_cap))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
cap_size_offset, &cap_size))
|
|
return TPM_LIB_ERROR;
|
|
if (cap_size > response_length || cap_size > count)
|
|
return TPM_LIB_ERROR;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
cap_offset, cap, cap_size))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_get_permanent_flags(struct tpm_permanent_flags *pflags)
|
|
{
|
|
const u8 command[22] = {
|
|
0x0, 0xc1, /* TPM_TAG */
|
|
0x0, 0x0, 0x0, 0x16, /* parameter size */
|
|
0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */
|
|
0x0, 0x0, 0x0, 0x4, /* TPM_CAP_FLAG_PERM */
|
|
0x0, 0x0, 0x0, 0x4, /* subcap size */
|
|
0x0, 0x0, 0x1, 0x8, /* subcap value */
|
|
};
|
|
const size_t data_size_offset = TPM_HEADER_SIZE;
|
|
const size_t data_offset = TPM_HEADER_SIZE + sizeof(u32);
|
|
u8 response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
u32 data_size;
|
|
|
|
err = tpm_sendrecv_command(command, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
data_size_offset, &data_size))
|
|
return TPM_LIB_ERROR;
|
|
if (data_size < sizeof(*pflags))
|
|
return TPM_LIB_ERROR;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
data_offset, pflags, sizeof(*pflags)))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_get_permissions(u32 index, u32 *perm)
|
|
{
|
|
const u8 command[22] = {
|
|
0x0, 0xc1, /* TPM_TAG */
|
|
0x0, 0x0, 0x0, 0x16, /* parameter size */
|
|
0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */
|
|
0x0, 0x0, 0x0, 0x11,
|
|
0x0, 0x0, 0x0, 0x4,
|
|
};
|
|
const size_t index_offset = 18;
|
|
const size_t perm_offset = 60;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "d", 0, command, sizeof(command),
|
|
index_offset, index))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
perm_offset, perm))
|
|
return TPM_LIB_ERROR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_TPM_FLUSH_RESOURCES
|
|
u32 tpm_flush_specific(u32 key_handle, u32 resource_type)
|
|
{
|
|
const u8 command[18] = {
|
|
0x00, 0xc1, /* TPM_TAG */
|
|
0x00, 0x00, 0x00, 0x12, /* parameter size */
|
|
0x00, 0x00, 0x00, 0xba, /* TPM_COMMAND_CODE */
|
|
0x00, 0x00, 0x00, 0x00, /* key handle */
|
|
0x00, 0x00, 0x00, 0x00, /* resource type */
|
|
};
|
|
const size_t key_handle_offset = 10;
|
|
const size_t resource_type_offset = 14;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sdd",
|
|
0, command, sizeof(command),
|
|
key_handle_offset, key_handle,
|
|
resource_type_offset, resource_type))
|
|
return TPM_LIB_ERROR;
|
|
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_TPM_FLUSH_RESOURCES */
|
|
|
|
#ifdef CONFIG_TPM_AUTH_SESSIONS
|
|
|
|
/**
|
|
* Fill an authentication block in a request.
|
|
* This func can create the first as well as the second auth block (for
|
|
* double authorized commands).
|
|
*
|
|
* @param request pointer to the request (w/ uninitialised auth data)
|
|
* @param request_len0 length of the request without auth data
|
|
* @param handles_len length of the handles area in request
|
|
* @param auth_session pointer to the (valid) auth session to be used
|
|
* @param request_auth pointer to the auth block of the request to be filled
|
|
* @param auth authentication data (HMAC key)
|
|
*/
|
|
static u32 create_request_auth(const void *request, size_t request_len0,
|
|
size_t handles_len,
|
|
struct session_data *auth_session,
|
|
void *request_auth, const void *auth)
|
|
{
|
|
u8 hmac_data[DIGEST_LENGTH * 3 + 1];
|
|
sha1_context hash_ctx;
|
|
const size_t command_code_offset = 6;
|
|
const size_t auth_nonce_odd_offset = 4;
|
|
const size_t auth_continue_offset = 24;
|
|
const size_t auth_auth_offset = 25;
|
|
|
|
if (!auth_session || !auth_session->valid)
|
|
return TPM_LIB_ERROR;
|
|
|
|
sha1_starts(&hash_ctx);
|
|
sha1_update(&hash_ctx, request + command_code_offset, 4);
|
|
if (request_len0 > TPM_REQUEST_HEADER_LENGTH + handles_len)
|
|
sha1_update(&hash_ctx,
|
|
request + TPM_REQUEST_HEADER_LENGTH + handles_len,
|
|
request_len0 - TPM_REQUEST_HEADER_LENGTH
|
|
- handles_len);
|
|
sha1_finish(&hash_ctx, hmac_data);
|
|
|
|
sha1_starts(&hash_ctx);
|
|
sha1_update(&hash_ctx, auth_session->nonce_odd, DIGEST_LENGTH);
|
|
sha1_update(&hash_ctx, hmac_data, sizeof(hmac_data));
|
|
sha1_finish(&hash_ctx, auth_session->nonce_odd);
|
|
|
|
if (pack_byte_string(request_auth, TPM_REQUEST_AUTH_LENGTH, "dsb",
|
|
0, auth_session->handle,
|
|
auth_nonce_odd_offset, auth_session->nonce_odd,
|
|
DIGEST_LENGTH,
|
|
auth_continue_offset, 1))
|
|
return TPM_LIB_ERROR;
|
|
if (pack_byte_string(hmac_data, sizeof(hmac_data), "ss",
|
|
DIGEST_LENGTH,
|
|
auth_session->nonce_even,
|
|
DIGEST_LENGTH,
|
|
2 * DIGEST_LENGTH,
|
|
request_auth + auth_nonce_odd_offset,
|
|
DIGEST_LENGTH + 1))
|
|
return TPM_LIB_ERROR;
|
|
sha1_hmac(auth, DIGEST_LENGTH, hmac_data, sizeof(hmac_data),
|
|
request_auth + auth_auth_offset);
|
|
|
|
return TPM_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Verify an authentication block in a response.
|
|
* Since this func updates the nonce_even in the session data it has to be
|
|
* called when receiving a succesfull AUTH response.
|
|
* This func can verify the first as well as the second auth block (for
|
|
* double authorized commands).
|
|
*
|
|
* @param command_code command code of the request
|
|
* @param response pointer to the request (w/ uninitialised auth data)
|
|
* @param handles_len length of the handles area in response
|
|
* @param auth_session pointer to the (valid) auth session to be used
|
|
* @param response_auth pointer to the auth block of the response to be verified
|
|
* @param auth authentication data (HMAC key)
|
|
*/
|
|
static u32 verify_response_auth(u32 command_code, const void *response,
|
|
size_t response_len0, size_t handles_len,
|
|
struct session_data *auth_session,
|
|
const void *response_auth, const void *auth)
|
|
{
|
|
u8 hmac_data[DIGEST_LENGTH * 3 + 1];
|
|
u8 computed_auth[DIGEST_LENGTH];
|
|
sha1_context hash_ctx;
|
|
const size_t return_code_offset = 6;
|
|
const size_t auth_continue_offset = 20;
|
|
const size_t auth_auth_offset = 21;
|
|
u8 auth_continue;
|
|
|
|
if (!auth_session || !auth_session->valid)
|
|
return TPM_AUTHFAIL;
|
|
if (pack_byte_string(hmac_data, sizeof(hmac_data), "d",
|
|
0, command_code))
|
|
return TPM_LIB_ERROR;
|
|
if (response_len0 < TPM_RESPONSE_HEADER_LENGTH)
|
|
return TPM_LIB_ERROR;
|
|
|
|
sha1_starts(&hash_ctx);
|
|
sha1_update(&hash_ctx, response + return_code_offset, 4);
|
|
sha1_update(&hash_ctx, hmac_data, 4);
|
|
if (response_len0 > TPM_RESPONSE_HEADER_LENGTH + handles_len)
|
|
sha1_update(&hash_ctx,
|
|
response + TPM_RESPONSE_HEADER_LENGTH + handles_len,
|
|
response_len0 - TPM_RESPONSE_HEADER_LENGTH
|
|
- handles_len);
|
|
sha1_finish(&hash_ctx, hmac_data);
|
|
|
|
memcpy(auth_session->nonce_even, response_auth, DIGEST_LENGTH);
|
|
auth_continue = ((u8 *)response_auth)[auth_continue_offset];
|
|
if (pack_byte_string(hmac_data, sizeof(hmac_data), "ssb",
|
|
DIGEST_LENGTH,
|
|
response_auth,
|
|
DIGEST_LENGTH,
|
|
2 * DIGEST_LENGTH,
|
|
auth_session->nonce_odd,
|
|
DIGEST_LENGTH,
|
|
3 * DIGEST_LENGTH,
|
|
auth_continue))
|
|
return TPM_LIB_ERROR;
|
|
|
|
sha1_hmac(auth, DIGEST_LENGTH, hmac_data, sizeof(hmac_data),
|
|
computed_auth);
|
|
|
|
if (memcmp(computed_auth, response_auth + auth_auth_offset,
|
|
DIGEST_LENGTH))
|
|
return TPM_AUTHFAIL;
|
|
|
|
return TPM_SUCCESS;
|
|
}
|
|
|
|
u32 tpm_terminate_auth_session(u32 auth_handle)
|
|
{
|
|
const u8 command[18] = {
|
|
0x00, 0xc1, /* TPM_TAG */
|
|
0x00, 0x00, 0x00, 0x00, /* parameter size */
|
|
0x00, 0x00, 0x00, 0xba, /* TPM_COMMAND_CODE */
|
|
0x00, 0x00, 0x00, 0x00, /* TPM_HANDLE */
|
|
0x00, 0x00, 0x00, 0x02, /* TPM_RESOURCE_TYPE */
|
|
};
|
|
const size_t req_handle_offset = TPM_REQUEST_HEADER_LENGTH;
|
|
u8 request[COMMAND_BUFFER_SIZE];
|
|
|
|
if (pack_byte_string(request, sizeof(request), "sd",
|
|
0, command, sizeof(command),
|
|
req_handle_offset, auth_handle))
|
|
return TPM_LIB_ERROR;
|
|
if (oiap_session.valid && oiap_session.handle == auth_handle)
|
|
oiap_session.valid = 0;
|
|
|
|
return tpm_sendrecv_command(request, NULL, NULL);
|
|
}
|
|
|
|
u32 tpm_end_oiap(void)
|
|
{
|
|
u32 err = TPM_SUCCESS;
|
|
|
|
if (oiap_session.valid)
|
|
err = tpm_terminate_auth_session(oiap_session.handle);
|
|
return err;
|
|
}
|
|
|
|
u32 tpm_oiap(u32 *auth_handle)
|
|
{
|
|
const u8 command[10] = {
|
|
0x00, 0xc1, /* TPM_TAG */
|
|
0x00, 0x00, 0x00, 0x0a, /* parameter size */
|
|
0x00, 0x00, 0x00, 0x0a, /* TPM_COMMAND_CODE */
|
|
};
|
|
const size_t res_auth_handle_offset = TPM_RESPONSE_HEADER_LENGTH;
|
|
const size_t res_nonce_even_offset = TPM_RESPONSE_HEADER_LENGTH + 4;
|
|
u8 response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (oiap_session.valid)
|
|
tpm_terminate_auth_session(oiap_session.handle);
|
|
|
|
err = tpm_sendrecv_command(command, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "ds",
|
|
res_auth_handle_offset, &oiap_session.handle,
|
|
res_nonce_even_offset, &oiap_session.nonce_even,
|
|
(u32)DIGEST_LENGTH))
|
|
return TPM_LIB_ERROR;
|
|
oiap_session.valid = 1;
|
|
if (auth_handle)
|
|
*auth_handle = oiap_session.handle;
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_load_key2_oiap(u32 parent_handle, const void *key, size_t key_length,
|
|
const void *parent_key_usage_auth, u32 *key_handle)
|
|
{
|
|
const u8 command[14] = {
|
|
0x00, 0xc2, /* TPM_TAG */
|
|
0x00, 0x00, 0x00, 0x00, /* parameter size */
|
|
0x00, 0x00, 0x00, 0x41, /* TPM_COMMAND_CODE */
|
|
0x00, 0x00, 0x00, 0x00, /* parent handle */
|
|
};
|
|
const size_t req_size_offset = 2;
|
|
const size_t req_parent_handle_offset = TPM_REQUEST_HEADER_LENGTH;
|
|
const size_t req_key_offset = TPM_REQUEST_HEADER_LENGTH + 4;
|
|
const size_t res_handle_offset = TPM_RESPONSE_HEADER_LENGTH;
|
|
u8 request[sizeof(command) + TPM_KEY12_MAX_LENGTH +
|
|
TPM_REQUEST_AUTH_LENGTH];
|
|
u8 response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (!oiap_session.valid) {
|
|
err = tpm_oiap(NULL);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (pack_byte_string(request, sizeof(request), "sdds",
|
|
0, command, sizeof(command),
|
|
req_size_offset,
|
|
sizeof(command) + key_length
|
|
+ TPM_REQUEST_AUTH_LENGTH,
|
|
req_parent_handle_offset, parent_handle,
|
|
req_key_offset, key, key_length
|
|
))
|
|
return TPM_LIB_ERROR;
|
|
|
|
err = create_request_auth(request, sizeof(command) + key_length, 4,
|
|
&oiap_session,
|
|
request + sizeof(command) + key_length,
|
|
parent_key_usage_auth);
|
|
if (err)
|
|
return err;
|
|
err = tpm_sendrecv_command(request, response, &response_length);
|
|
if (err) {
|
|
if (err == TPM_AUTHFAIL)
|
|
oiap_session.valid = 0;
|
|
return err;
|
|
}
|
|
|
|
err = verify_response_auth(0x00000041, response,
|
|
response_length - TPM_RESPONSE_AUTH_LENGTH,
|
|
4, &oiap_session,
|
|
response + response_length -
|
|
TPM_RESPONSE_AUTH_LENGTH,
|
|
parent_key_usage_auth);
|
|
if (err)
|
|
return err;
|
|
|
|
if (key_handle) {
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
res_handle_offset, key_handle))
|
|
return TPM_LIB_ERROR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
u32 tpm_get_pub_key_oiap(u32 key_handle, const void *usage_auth, void *pubkey,
|
|
size_t *pubkey_len)
|
|
{
|
|
const u8 command[14] = {
|
|
0x00, 0xc2, /* TPM_TAG */
|
|
0x00, 0x00, 0x00, 0x00, /* parameter size */
|
|
0x00, 0x00, 0x00, 0x21, /* TPM_COMMAND_CODE */
|
|
0x00, 0x00, 0x00, 0x00, /* key handle */
|
|
};
|
|
const size_t req_size_offset = 2;
|
|
const size_t req_key_handle_offset = TPM_REQUEST_HEADER_LENGTH;
|
|
const size_t res_pubkey_offset = TPM_RESPONSE_HEADER_LENGTH;
|
|
u8 request[sizeof(command) + TPM_REQUEST_AUTH_LENGTH];
|
|
u8 response[TPM_RESPONSE_HEADER_LENGTH + TPM_PUBKEY_MAX_LENGTH +
|
|
TPM_RESPONSE_AUTH_LENGTH];
|
|
size_t response_length = sizeof(response);
|
|
u32 err;
|
|
|
|
if (!oiap_session.valid) {
|
|
err = tpm_oiap(NULL);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (pack_byte_string(request, sizeof(request), "sdd",
|
|
0, command, sizeof(command),
|
|
req_size_offset,
|
|
(u32)(sizeof(command)
|
|
+ TPM_REQUEST_AUTH_LENGTH),
|
|
req_key_handle_offset, key_handle
|
|
))
|
|
return TPM_LIB_ERROR;
|
|
err = create_request_auth(request, sizeof(command), 4, &oiap_session,
|
|
request + sizeof(command), usage_auth);
|
|
if (err)
|
|
return err;
|
|
err = tpm_sendrecv_command(request, response, &response_length);
|
|
if (err) {
|
|
if (err == TPM_AUTHFAIL)
|
|
oiap_session.valid = 0;
|
|
return err;
|
|
}
|
|
err = verify_response_auth(0x00000021, response,
|
|
response_length - TPM_RESPONSE_AUTH_LENGTH,
|
|
0, &oiap_session,
|
|
response + response_length -
|
|
TPM_RESPONSE_AUTH_LENGTH,
|
|
usage_auth);
|
|
if (err)
|
|
return err;
|
|
|
|
if (pubkey) {
|
|
if ((response_length - TPM_RESPONSE_HEADER_LENGTH
|
|
- TPM_RESPONSE_AUTH_LENGTH) > *pubkey_len)
|
|
return TPM_LIB_ERROR;
|
|
*pubkey_len = response_length - TPM_RESPONSE_HEADER_LENGTH
|
|
- TPM_RESPONSE_AUTH_LENGTH;
|
|
memcpy(pubkey, response + res_pubkey_offset,
|
|
response_length - TPM_RESPONSE_HEADER_LENGTH
|
|
- TPM_RESPONSE_AUTH_LENGTH);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1
|
|
u32 tpm_find_key_sha1(const u8 auth[20], const u8 pubkey_digest[20],
|
|
u32 *handle)
|
|
{
|
|
u16 key_count;
|
|
u32 key_handles[10];
|
|
u8 buf[288];
|
|
u8 *ptr;
|
|
u32 err;
|
|
u8 digest[20];
|
|
size_t buf_len;
|
|
unsigned int i;
|
|
|
|
/* fetch list of already loaded keys in the TPM */
|
|
err = tpm_get_capability(TPM_CAP_HANDLE, TPM_RT_KEY, buf, sizeof(buf));
|
|
if (err)
|
|
return -1;
|
|
key_count = get_unaligned_be16(buf);
|
|
ptr = buf + 2;
|
|
for (i = 0; i < key_count; ++i, ptr += 4)
|
|
key_handles[i] = get_unaligned_be32(ptr);
|
|
|
|
/* now search a(/ the) key which we can access with the given auth */
|
|
for (i = 0; i < key_count; ++i) {
|
|
buf_len = sizeof(buf);
|
|
err = tpm_get_pub_key_oiap(key_handles[i], auth, buf, &buf_len);
|
|
if (err && err != TPM_AUTHFAIL)
|
|
return -1;
|
|
if (err)
|
|
continue;
|
|
sha1_csum(buf, buf_len, digest);
|
|
if (!memcmp(digest, pubkey_digest, 20)) {
|
|
*handle = key_handles[i];
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
#endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
|
|
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
|
|
u32 tpm_get_random(void *data, u32 count)
|
|
{
|
|
const u8 command[14] = {
|
|
0x0, 0xc1, /* TPM_TAG */
|
|
0x0, 0x0, 0x0, 0xe, /* parameter size */
|
|
0x0, 0x0, 0x0, 0x46, /* TPM_COMMAND_CODE */
|
|
};
|
|
const size_t length_offset = 10;
|
|
const size_t data_size_offset = 10;
|
|
const size_t data_offset = 14;
|
|
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
|
|
size_t response_length = sizeof(response);
|
|
u32 data_size;
|
|
u8 *out = data;
|
|
|
|
while (count > 0) {
|
|
u32 this_bytes = min((size_t)count,
|
|
sizeof(response) - data_offset);
|
|
u32 err;
|
|
|
|
if (pack_byte_string(buf, sizeof(buf), "sd",
|
|
0, command, sizeof(command),
|
|
length_offset, this_bytes))
|
|
return TPM_LIB_ERROR;
|
|
err = tpm_sendrecv_command(buf, response, &response_length);
|
|
if (err)
|
|
return err;
|
|
if (unpack_byte_string(response, response_length, "d",
|
|
data_size_offset, &data_size))
|
|
return TPM_LIB_ERROR;
|
|
if (data_size > count)
|
|
return TPM_LIB_ERROR;
|
|
if (unpack_byte_string(response, response_length, "s",
|
|
data_offset, out, data_size))
|
|
return TPM_LIB_ERROR;
|
|
|
|
count -= data_size;
|
|
out += data_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|