| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (c) 2013 The Chromium OS Authors. |
| * Coypright (c) 2013 Guntermann & Drunck GmbH |
| */ |
| |
| #define LOG_CATEGORY UCLASS_TPM |
| |
| #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(struct udevice *dev, 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(dev, buf, NULL, NULL); |
| } |
| |
| u32 tpm_resume(struct udevice *dev) |
| { |
| return tpm_startup(dev, TPM_ST_STATE); |
| } |
| |
| u32 tpm_self_test_full(struct udevice *dev) |
| { |
| const u8 command[10] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x50, |
| }; |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_continue_self_test(struct udevice *dev) |
| { |
| const u8 command[10] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x53, |
| }; |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_clear_and_reenable(struct udevice *dev) |
| { |
| u32 ret; |
| |
| log_info("TPM: Clear and re-enable\n"); |
| ret = tpm_force_clear(dev); |
| if (ret != TPM_SUCCESS) { |
| log_err("Can't initiate a force clear\n"); |
| return ret; |
| } |
| |
| if (tpm_get_version(dev) == TPM_V1) { |
| ret = tpm_physical_enable(dev); |
| if (ret != TPM_SUCCESS) { |
| log_err("TPM: Can't set enabled state\n"); |
| return ret; |
| } |
| |
| ret = tpm_physical_set_deactivated(dev, 0); |
| if (ret != TPM_SUCCESS) { |
| log_err("TPM: Can't set deactivated state\n"); |
| return ret; |
| } |
| } |
| |
| return TPM_SUCCESS; |
| } |
| |
| u32 tpm_nv_define_space(struct udevice *dev, 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(dev, buf, NULL, NULL); |
| } |
| |
| u32 tpm_nv_set_locked(struct udevice *dev) |
| { |
| return tpm_nv_define_space(dev, TPM_NV_INDEX_LOCK, 0, 0); |
| } |
| |
| u32 tpm_nv_read_value(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, buf, response, &response_length); |
| if (err) |
| return err; |
| |
| return 0; |
| } |
| |
| uint32_t tpm_set_global_lock(struct udevice *dev) |
| { |
| return tpm_nv_write_value(dev, TPM_NV_INDEX_0, NULL, 0); |
| } |
| |
| u32 tpm_extend(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, buf, NULL, NULL); |
| } |
| |
| u32 tpm_finalise_physical_presence(struct udevice *dev) |
| { |
| const u8 command[12] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x40, 0x0, 0x0, 0xa, 0x2, 0xa0, |
| }; |
| |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_read_pubek(struct udevice *dev, 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(dev, 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(struct udevice *dev) |
| { |
| const u8 command[10] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x5d, |
| }; |
| |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_physical_enable(struct udevice *dev) |
| { |
| const u8 command[10] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x6f, |
| }; |
| |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_physical_disable(struct udevice *dev) |
| { |
| const u8 command[10] = { |
| 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x70, |
| }; |
| |
| return tpm_sendrecv_command(dev, command, NULL, NULL); |
| } |
| |
| u32 tpm_physical_set_deactivated(struct udevice *dev, 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(dev, buf, NULL, NULL); |
| } |
| |
| u32 tpm_get_capability(struct udevice *dev, 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(dev, 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 udevice *dev, |
| 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(dev, command, response, &response_length); |
| if (err) |
| return err; |
| if (unpack_byte_string(response, response_length, "d", |
| data_size_offset, &data_size)) { |
| log_err("Cannot unpack data size\n"); |
| return TPM_LIB_ERROR; |
| } |
| if (data_size < sizeof(*pflags)) { |
| log_err("Data size too small\n"); |
| return TPM_LIB_ERROR; |
| } |
| if (unpack_byte_string(response, response_length, "s", |
| data_offset, pflags, sizeof(*pflags))) { |
| log_err("Cannot unpack pflags\n"); |
| return TPM_LIB_ERROR; |
| } |
| |
| return 0; |
| } |
| |
| u32 tpm_get_permissions(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, request, NULL, NULL); |
| } |
| |
| u32 tpm_end_oiap(struct udevice *dev) |
| { |
| u32 err = TPM_SUCCESS; |
| |
| if (oiap_session.valid) |
| err = tpm_terminate_auth_session(dev, oiap_session.handle); |
| return err; |
| } |
| |
| u32 tpm_oiap(struct udevice *dev, 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(dev, oiap_session.handle); |
| |
| err = tpm_sendrecv_command(dev, 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(struct udevice *dev, 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(dev, 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(dev, 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(struct udevice *dev, 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(dev, 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(dev, 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(struct udevice *dev, 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(dev, 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(struct udevice *dev, 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(dev, 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; |
| } |