| /* |
| * Copyright 2016 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "2sysincludes.h" |
| #include "2common.h" |
| |
| #include "tpm2_marshaling.h" |
| #include "utility.h" |
| |
| static uint16_t tpm_tag; /* Depends on the command type. */ |
| static int ph_disabled; /* Platform hierarchy disabled. */ |
| |
| static void write_be16(void *dest, uint16_t val) |
| { |
| uint8_t *byte_dest = dest; |
| |
| byte_dest[0] = val >> 8; |
| byte_dest[1] = val; |
| } |
| |
| static void write_be32(void *dest, uint32_t val) |
| { |
| uint8_t *byte_dest = dest; |
| |
| byte_dest[0] = val >> 24; |
| byte_dest[1] = val >> 16; |
| byte_dest[2] = val >> 8; |
| byte_dest[3] = val; |
| } |
| |
| static uint16_t read_be16(const void *src) |
| { |
| const uint8_t *s = src; |
| return (((uint16_t)s[0]) << 8) | (((uint16_t)s[1]) << 0); |
| } |
| |
| static inline uint32_t read_be32(const void *src) |
| { |
| const uint8_t *s = src; |
| |
| return (((uint32_t)s[0]) << 24) | (((uint32_t)s[1]) << 16) | |
| (((uint32_t)s[2]) << 8) | (((uint32_t)s[3]) << 0); |
| } |
| |
| /* |
| * Each unmarshaling function receives a pointer to the buffer pointer and a |
| * pointer to the size of data still in the buffer. The function extracts data |
| * from the buffer and adjusts both buffer pointer and remaining data size. |
| * |
| * Should there be not enough data in the buffer to unmarshal the required |
| * object, the remaining data size is set to -1 to indicate the error. The |
| * remaining data size is expected to be set to zero once the last data item |
| * has been extracted from the buffer. |
| */ |
| |
| static uint8_t unmarshal_u8(void **buffer, int *buffer_space) |
| { |
| uint8_t value; |
| |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; /* Indicate a failure. */ |
| return 0; |
| } |
| |
| value = *(uint8_t *)(*buffer); |
| *buffer = (void *) ((uintptr_t) (*buffer) + sizeof(value)); |
| *buffer_space -= sizeof(value); |
| |
| return value; |
| } |
| |
| static uint16_t unmarshal_u16(void **buffer, int *buffer_space) |
| { |
| uint16_t value; |
| |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; /* Indicate a failure. */ |
| return 0; |
| } |
| |
| value = read_be16(*buffer); |
| *buffer = (void *) ((uintptr_t) (*buffer) + sizeof(value)); |
| *buffer_space -= sizeof(value); |
| |
| return value; |
| } |
| |
| static uint32_t unmarshal_u32(void **buffer, int *buffer_space) |
| { |
| uint32_t value; |
| |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; /* Indicate a failure. */ |
| return 0; |
| } |
| |
| value = read_be32(*buffer); |
| *buffer = (void *) ((uintptr_t) (*buffer) + sizeof(value)); |
| *buffer_space -= sizeof(value); |
| |
| return value; |
| } |
| |
| #define unmarshal_TPM_HANDLE(a, b) unmarshal_u32(a, b) |
| #define unmarshal_ALG_ID(a, b) unmarshal_u16(a, b) |
| |
| static void unmarshal_TPM2B_MAX_NV_BUFFER(void **buffer, |
| int *size, |
| TPM2B_MAX_NV_BUFFER *nv_buffer) |
| { |
| nv_buffer->t.size = unmarshal_u16(buffer, size); |
| if (nv_buffer->t.size > *size) { |
| VB2_DEBUG("size mismatch: expected %d, remaining %d\n", |
| nv_buffer->t.size, *size); |
| return; |
| } |
| |
| nv_buffer->t.buffer = *buffer; |
| |
| *buffer = ((uint8_t *)(*buffer)) + nv_buffer->t.size; |
| *size -= nv_buffer->t.size; |
| } |
| |
| static void unmarshal_authorization_section(void **buffer, int *size, |
| char *cmd_name) |
| { |
| /* |
| * Let's ignore the authorisation section. It should be 5 bytes total, |
| * just confirm that this is the case and report any discrepancy. |
| */ |
| if (*size != 5) |
| VB2_DEBUG("unexpected authorisation section size %d for %s\n", |
| *size, cmd_name); |
| |
| *buffer = ((uint8_t *)(*buffer)) + *size; |
| *size = 0; |
| } |
| |
| static void unmarshal_nv_read(void **buffer, int *size, |
| struct nv_read_response *nvr) |
| { |
| /* Total size of the parameter field. */ |
| nvr->params_size = unmarshal_u32(buffer, size); |
| unmarshal_TPM2B_MAX_NV_BUFFER(buffer, size, &nvr->buffer); |
| |
| if (nvr->params_size != |
| (nvr->buffer.t.size + sizeof(nvr->buffer.t.size))) { |
| VB2_DEBUG("parameter/buffer %d/%d size mismatch", |
| nvr->params_size, nvr->buffer.t.size); |
| return; |
| } |
| |
| if (*size < 0) |
| return; |
| |
| unmarshal_authorization_section(buffer, size, "NV_Read"); |
| } |
| |
| static void unmarshal_TPM2B(void **buffer, |
| int *size, |
| TPM2B *tpm2b) |
| { |
| tpm2b->size = unmarshal_u16(buffer, size); |
| if (tpm2b->size > *size) { |
| VB2_DEBUG("size mismatch: expected %d, remaining %d\n", |
| tpm2b->size, *size); |
| *size = -1; |
| return; |
| } |
| |
| tpm2b->buffer = *buffer; |
| |
| *buffer = ((uint8_t *)(*buffer)) + tpm2b->size; |
| *size -= tpm2b->size; |
| } |
| |
| static void unmarshal_TPMS_NV_PUBLIC(void **buffer, |
| int *size, |
| TPMS_NV_PUBLIC *pub) |
| { |
| int tpm2b_size = unmarshal_u16(buffer, size); |
| if (tpm2b_size > *size) { |
| VB2_DEBUG("size mismatch: expected %d, remaining %d\n", |
| tpm2b_size, *size); |
| *size = -1; |
| return; |
| } |
| *size -= tpm2b_size; |
| |
| pub->nvIndex = unmarshal_TPM_HANDLE(buffer, &tpm2b_size); |
| pub->nameAlg = unmarshal_ALG_ID(buffer, &tpm2b_size); |
| pub->attributes = unmarshal_u32(buffer, &tpm2b_size); |
| unmarshal_TPM2B(buffer, &tpm2b_size, &pub->authPolicy); |
| pub->dataSize = unmarshal_u16(buffer, &tpm2b_size); |
| |
| if (tpm2b_size != 0) { |
| VB2_DEBUG("TPMS_NV_PUBLIC size doesn't match size field\n"); |
| *size = -1; |
| return; |
| } |
| } |
| |
| static void unmarshal_nv_read_public(void **buffer, int *size, |
| struct nv_read_public_response *nv_pub) |
| { |
| unmarshal_TPMS_NV_PUBLIC(buffer, size, &nv_pub->nvPublic); |
| unmarshal_TPM2B(buffer, size, &nv_pub->nvName); |
| |
| if (*size > 0) { |
| VB2_DEBUG("extra %d bytes after nvName\n", *size); |
| *size = -1; |
| return; |
| } |
| } |
| |
| static void unmarshal_TPML_TAGGED_TPM_PROPERTY(void **buffer, int *size, |
| TPML_TAGGED_TPM_PROPERTY *prop) |
| { |
| prop->count = unmarshal_u32(buffer, size); |
| |
| if (prop->count != 1) { |
| *size = -1; |
| VB2_DEBUG("Request to unmarshal unsupported " |
| "number of properties: %u\n", |
| prop->count); |
| return; |
| } |
| |
| prop->tpm_property[0].property = unmarshal_u32(buffer, size); |
| prop->tpm_property[0].value = unmarshal_u32(buffer, size); |
| } |
| |
| static void unmarshal_TPMS_CAPABILITY_DATA(void **buffer, int *size, |
| TPMS_CAPABILITY_DATA *cap_data) |
| { |
| cap_data->capability = unmarshal_u32(buffer, size); |
| |
| switch (cap_data->capability) { |
| |
| case TPM_CAP_TPM_PROPERTIES: |
| unmarshal_TPML_TAGGED_TPM_PROPERTY(buffer, size, |
| &cap_data->data. |
| tpm_properties); |
| break; |
| |
| default: |
| *size = -1; |
| VB2_DEBUG("Request to unmarshal unsupported capability %#x\n", |
| cap_data->capability); |
| } |
| } |
| |
| static void unmarshal_get_capability(void **buffer, int *size, |
| struct get_capability_response *cap) |
| { |
| /* Total size of the parameter field. */ |
| cap->more_data = unmarshal_u8(buffer, size); |
| unmarshal_TPMS_CAPABILITY_DATA(buffer, size, &cap->capability_data); |
| } |
| |
| |
| /* |
| * Each marshaling function receives a pointer to the buffer to marshal into, |
| * a pointer to the data item to be marshaled, and a pointer to the remaining |
| * room in the buffer. |
| */ |
| |
| /* |
| * Marshaling an arbitrary blob requires its size in addition to common |
| * parameter set. |
| */ |
| static void marshal_blob(void **buffer, void *blob, |
| size_t blob_size, int *buffer_space) |
| { |
| if (*buffer_space < blob_size) { |
| *buffer_space = -1; |
| return; |
| } |
| |
| memcpy(*buffer, blob, blob_size); |
| buffer_space -= blob_size; |
| *buffer = (void *)((uintptr_t)(*buffer) + blob_size); |
| } |
| |
| static void marshal_u8(void **buffer, uint8_t value, int *buffer_space) |
| { |
| uint8_t *bp = *buffer; |
| |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; |
| return; |
| } |
| |
| *bp++ = value; |
| *buffer = bp; |
| *buffer_space -= sizeof(value); |
| } |
| |
| static void marshal_u16(void **buffer, uint16_t value, int *buffer_space) |
| { |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; |
| return; |
| } |
| write_be16(*buffer, value); |
| *buffer = (void *)((uintptr_t)(*buffer) + sizeof(value)); |
| *buffer_space -= sizeof(value); |
| } |
| |
| static void marshal_u32(void **buffer, uint32_t value, int *buffer_space) |
| { |
| if (*buffer_space < sizeof(value)) { |
| *buffer_space = -1; |
| return; |
| } |
| |
| write_be32(*buffer, value); |
| *buffer = (void *)((uintptr_t)(*buffer) + sizeof(value)); |
| *buffer_space -= sizeof(value); |
| } |
| |
| #define marshal_TPM_HANDLE(a, b, c) marshal_u32(a, b, c) |
| #define marshal_TPM_SU(a, b, c) marshal_u16(a, b, c) |
| #define marshal_ALG_ID(a, b, c) marshal_u16(a, b, c) |
| |
| /* |
| * For TPM2B* structures the size field (16 or 32 bits) goes before the data. |
| * When marshaling, we first reserve the space for the size field, then |
| * marshal the data, then fill the reserved size field with the actual size |
| * of the marshaled data. |
| */ |
| typedef struct { |
| int size; |
| void *location; |
| } tpm2_marshal_size_field; |
| |
| static void marshal_reserve_size_field(void **buffer, |
| tpm2_marshal_size_field *field, |
| int field_size, |
| int *buffer_space) |
| { |
| if (field_size != sizeof(uint32_t) && field_size != sizeof(uint16_t)) { |
| VB2_DEBUG("Unsupported size field size: %d\n", field_size); |
| *buffer_space = -1; |
| return; |
| } |
| if (*buffer_space < field_size) { |
| *buffer_space = -1; |
| return; |
| } |
| field->size = field_size; |
| field->location = *buffer; |
| *buffer_space -= field_size; |
| *buffer = (void *)(((uintptr_t) *buffer) + field_size); |
| } |
| |
| static void marshal_fill_size_field(void **buffer, |
| tpm2_marshal_size_field *field, |
| int include_size_field, |
| int *buffer_space) |
| { |
| uintptr_t size = (uintptr_t) *buffer - (uintptr_t) field->location; |
| |
| if (*buffer_space < 0) |
| return; /* The structure did not fit. */ |
| |
| if (!include_size_field) |
| size -= field->size; |
| if (field->size == sizeof(uint32_t)) |
| marshal_u32(&field->location, size, &field->size); |
| else /* if (field->size == sizeof(uint16_t)) */ |
| marshal_u16(&field->location, size, &field->size); |
| } |
| |
| static void marshal_session_header(void **buffer, |
| struct tpm2_session_header *session_header, |
| int *buffer_space) |
| { |
| tpm2_marshal_size_field size_field; |
| |
| /* Skip room for the session header size. */ |
| marshal_reserve_size_field(buffer, &size_field, |
| sizeof(uint32_t), buffer_space); |
| |
| marshal_u32(buffer, session_header->session_handle, buffer_space); |
| marshal_u16(buffer, session_header->nonce_size, buffer_space); |
| marshal_blob(buffer, session_header->nonce, |
| session_header->nonce_size, buffer_space); |
| marshal_u8(buffer, session_header->session_attrs, buffer_space); |
| marshal_u16(buffer, session_header->auth_size, buffer_space); |
| marshal_blob(buffer, session_header->auth, |
| session_header->auth_size, buffer_space); |
| |
| /* Paste in the session size. */ |
| marshal_fill_size_field(buffer, &size_field, 0, buffer_space); |
| } |
| |
| static void marshal_TPM2B(void **buffer, |
| TPM2B *data, |
| int *buffer_space) |
| { |
| size_t total_size = data->size + sizeof(data->size); |
| |
| if (total_size > *buffer_space) { |
| *buffer_space = -1; |
| return; |
| } |
| marshal_u16(buffer, data->size, buffer_space); |
| memcpy(*buffer, data->buffer, data->size); |
| *buffer = ((uint8_t *)(*buffer)) + data->size; |
| *buffer_space -= data->size; |
| } |
| |
| static void marshal_TPMS_NV_PUBLIC(void **buffer, |
| TPMS_NV_PUBLIC *data, |
| int *buffer_space) |
| { |
| tpm2_marshal_size_field size_field; |
| |
| /* Skip room for the size. */ |
| marshal_reserve_size_field(buffer, &size_field, |
| sizeof(uint16_t), buffer_space); |
| |
| marshal_TPM_HANDLE(buffer, data->nvIndex, buffer_space); |
| marshal_ALG_ID(buffer, data->nameAlg, buffer_space); |
| marshal_u32(buffer, data->attributes, buffer_space); |
| marshal_TPM2B(buffer, &data->authPolicy, buffer_space); |
| marshal_u16(buffer, data->dataSize, buffer_space); |
| |
| /* Paste in the structure size. */ |
| marshal_fill_size_field(buffer, &size_field, 0, buffer_space); |
| } |
| |
| static void marshal_nv_define_space(void **buffer, |
| struct tpm2_nv_define_space_cmd |
| *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| /* Use platform authorization if PLATFORMCREATE is set, and owner |
| * authorization otherwise (per TPM2 Spec. Part 2. Section 31.3.1). |
| * Owner authorization with empty password will work only until |
| * ownership is taken. Platform authorization will work only until |
| * platform hierarchy is disabled (i.e. in firmware or in recovery |
| * mode). |
| */ |
| if (command_body->publicInfo.attributes & TPMA_NV_PLATFORMCREATE) |
| marshal_TPM_HANDLE(buffer, TPM_RH_PLATFORM, buffer_space); |
| else |
| marshal_TPM_HANDLE(buffer, TPM_RH_OWNER, buffer_space); |
| |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| tpm_tag = TPM_ST_SESSIONS; |
| |
| marshal_TPM2B(buffer, &command_body->auth, buffer_space); |
| marshal_TPMS_NV_PUBLIC(buffer, &command_body->publicInfo, buffer_space); |
| } |
| |
| /* Determine which authorization should be used when writing or write-locking |
| * an NV index. |
| * |
| * Use a simplified approach: |
| * 1) Use platform auth for indexes defined by TPM and Platform, as |
| * specified in "Registry of reserved TPM 2.0 handles and localities". |
| * That will only work for indexes with PPWRITE, and until the platform |
| * hierarchy is disabled. |
| * 2) Use empty password auth for other indexes. |
| * That will only work for indexes with AUTHWRITE and empty auth value. |
| * |
| * A more honest approach would require the caller to specify the |
| * authorization, or would check the NV index attributes. |
| * But that's not needed now, as all indexes defined by firmware are |
| * in the TPM range and have PPWRITE. The indexes defined by the |
| * OS are in the Owner range and have either OWNERWRITE or AUTHWRITE, |
| * but we don't ever use Tlcl to write to OWNERWRITE indexes. |
| */ |
| static TPM_HANDLE get_nv_index_write_auth(TPMI_RH_NV_INDEX nvIndex) |
| { |
| return nvIndex >= TPMI_RH_NV_INDEX_OWNER_START ? |
| nvIndex : |
| TPM_RH_PLATFORM; |
| } |
| |
| static void marshal_nv_write(void **buffer, |
| struct tpm2_nv_write_cmd *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| marshal_TPM_HANDLE(buffer, |
| get_nv_index_write_auth(command_body->nvIndex), |
| buffer_space); |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| tpm_tag = TPM_ST_SESSIONS; |
| |
| marshal_TPM2B(buffer, &command_body->data.b, buffer_space); |
| marshal_u16(buffer, command_body->offset, buffer_space); |
| } |
| |
| static void marshal_nv_read(void **buffer, |
| struct tpm2_nv_read_cmd *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| /* Use empty password auth if platform hierarchy is disabled */ |
| if (ph_disabled) |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| else |
| marshal_TPM_HANDLE(buffer, TPM_RH_PLATFORM, buffer_space); |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| tpm_tag = TPM_ST_SESSIONS; |
| marshal_u16(buffer, command_body->size, buffer_space); |
| marshal_u16(buffer, command_body->offset, buffer_space); |
| } |
| |
| static void marshal_nv_read_lock(void **buffer, |
| struct tpm2_nv_read_lock_cmd *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| tpm_tag = TPM_ST_SESSIONS; |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| } |
| |
| static void marshal_nv_write_lock(void **buffer, |
| struct tpm2_nv_write_lock_cmd *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| tpm_tag = TPM_ST_SESSIONS; |
| marshal_TPM_HANDLE(buffer, |
| get_nv_index_write_auth(command_body->nvIndex), |
| buffer_space); |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| } |
| |
| static void marshal_nv_read_public(void **buffer, |
| struct tpm2_nv_read_public_cmd *command_body, |
| int *buffer_space) |
| { |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| marshal_TPM_HANDLE(buffer, command_body->nvIndex, buffer_space); |
| } |
| |
| static void marshal_hierarchy_control(void **buffer, |
| struct tpm2_hierarchy_control_cmd |
| *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| tpm_tag = TPM_ST_SESSIONS; |
| marshal_TPM_HANDLE(buffer, TPM_RH_PLATFORM, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| |
| marshal_TPM_HANDLE(buffer, command_body->enable, buffer_space); |
| marshal_u8(buffer, command_body->state, buffer_space); |
| } |
| |
| static void marshal_get_capability(void **buffer, |
| struct tpm2_get_capability_cmd |
| *command_body, |
| int *buffer_space) |
| { |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| marshal_u32(buffer, command_body->capability, buffer_space); |
| marshal_u32(buffer, command_body->property, buffer_space); |
| marshal_u32(buffer, command_body->property_count, buffer_space); |
| } |
| |
| static void marshal_clear(void **buffer, |
| void *command_body, |
| int *buffer_space) |
| { |
| struct tpm2_session_header session_header; |
| |
| tpm_tag = TPM_ST_SESSIONS; |
| marshal_TPM_HANDLE(buffer, TPM_RH_PLATFORM, buffer_space); |
| memset(&session_header, 0, sizeof(session_header)); |
| session_header.session_handle = TPM_RS_PW; |
| marshal_session_header(buffer, &session_header, buffer_space); |
| } |
| |
| static void marshal_self_test(void **buffer, |
| struct tpm2_self_test_cmd *command_body, |
| int *buffer_space) |
| { |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| marshal_u8(buffer, command_body->full_test, buffer_space); |
| } |
| |
| static void marshal_startup(void **buffer, |
| struct tpm2_startup_cmd *command_body, |
| int *buffer_space) |
| { |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| marshal_TPM_SU(buffer, command_body->startup_type, buffer_space); |
| } |
| |
| static void marshal_shutdown(void **buffer, |
| struct tpm2_shutdown_cmd *command_body, |
| int *buffer_space) |
| { |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| marshal_TPM_SU(buffer, command_body->shutdown_type, buffer_space); |
| } |
| |
| int tpm_marshal_command(TPM_CC command, void *tpm_command_body, |
| void *buffer, int buffer_size) |
| { |
| void *cmd_body = (uint8_t *)buffer + sizeof(struct tpm_header); |
| int max_body_size = buffer_size - sizeof(struct tpm_header); |
| int body_size = max_body_size; |
| |
| /* Will be modified when marshaling some commands. */ |
| tpm_tag = TPM_ST_NO_SESSIONS; |
| |
| switch (command) { |
| |
| case TPM2_NV_DefineSpace: |
| marshal_nv_define_space(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_NV_Read: |
| marshal_nv_read(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_NV_Write: |
| marshal_nv_write(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_NV_ReadLock: |
| marshal_nv_read_lock(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_NV_WriteLock: |
| marshal_nv_write_lock(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_NV_ReadPublic: |
| marshal_nv_read_public(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_Hierarchy_Control: |
| marshal_hierarchy_control(&cmd_body, |
| tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_GetCapability: |
| marshal_get_capability(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_Clear: |
| marshal_clear(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_SelfTest: |
| marshal_self_test(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_Startup: |
| marshal_startup(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| case TPM2_Shutdown: |
| marshal_shutdown(&cmd_body, tpm_command_body, &body_size); |
| break; |
| |
| default: |
| body_size = -1; |
| VB2_DEBUG("Request to marshal unsupported command %#x\n", |
| command); |
| } |
| |
| if (body_size > 0) { |
| |
| /* See how much room was taken by marshaling. */ |
| body_size = max_body_size - body_size; |
| |
| body_size += sizeof(struct tpm_header); |
| |
| marshal_u16(&buffer, tpm_tag, &max_body_size); |
| marshal_u32(&buffer, body_size, &max_body_size); |
| marshal_u32(&buffer, command, &max_body_size); |
| } |
| |
| return body_size; |
| } |
| |
| int tpm_unmarshal_response(TPM_CC command, |
| void *response_body, |
| int cr_size, |
| struct tpm2_response *response) |
| { |
| if (cr_size < sizeof(struct tpm_header)) |
| return -1; |
| |
| response->hdr.tpm_tag = unmarshal_u16(&response_body, &cr_size); |
| response->hdr.tpm_size = unmarshal_u32(&response_body, &cr_size); |
| response->hdr.tpm_code = unmarshal_u32(&response_body, &cr_size); |
| |
| if (!cr_size) { |
| if (response->hdr.tpm_size != sizeof(response->hdr)) |
| VB2_DEBUG("size mismatch in response to command %#x\n", |
| command); |
| return 0; |
| } |
| |
| switch (command) { |
| case TPM2_NV_Read: |
| unmarshal_nv_read(&response_body, &cr_size, |
| &response->nvr); |
| break; |
| |
| case TPM2_NV_ReadPublic: |
| unmarshal_nv_read_public(&response_body, &cr_size, |
| &response->nv_read_public); |
| break; |
| |
| case TPM2_GetCapability: |
| unmarshal_get_capability(&response_body, &cr_size, |
| &response->cap); |
| break; |
| |
| case TPM2_Hierarchy_Control: |
| case TPM2_NV_Write: |
| case TPM2_NV_WriteLock: |
| case TPM2_NV_ReadLock: |
| case TPM2_Clear: |
| case TPM2_SelfTest: |
| case TPM2_Startup: |
| case TPM2_Shutdown: |
| case TPM2_NV_DefineSpace: |
| /* Session data included in response can be safely ignored. */ |
| cr_size = 0; |
| break; |
| |
| default: |
| { |
| int i; |
| |
| VB2_DEBUG("Request to unmarshal unexpected command %#x," |
| " code %#x", |
| command, |
| response->hdr.tpm_code); |
| |
| for (i = 0; i < cr_size; i++) { |
| if (!(i % 16)) |
| VB2_DEBUG_RAW("\n"); |
| VB2_DEBUG_RAW("%2.2x ", |
| ((uint8_t *)response_body)[i]); |
| } |
| } |
| VB2_DEBUG("\n"); |
| return -1; |
| } |
| |
| if (cr_size) { |
| VB2_DEBUG("got %d bytes back in response to %#x," |
| " failed to parse (%d)\n", |
| response->hdr.tpm_size, |
| command, cr_size); |
| return -1; |
| } |
| |
| /* The entire message have been parsed. */ |
| return 0; |
| } |
| |
| uint32_t tpm_get_packet_size(const uint8_t *packet) |
| { |
| /* 0: tag (16 bit) |
| * 2: size (32 bit) |
| */ |
| return read_be32(packet + 2); |
| } |
| |
| uint32_t tpm_get_packet_response_code(const uint8_t *packet) |
| { |
| /* 0: tag (16 bit) |
| * 2: size (32 bit) |
| * 6: resp code (32 bit) |
| */ |
| return read_be32(packet + 6); |
| } |
| |
| void tpm_set_ph_disabled(int flag) |
| { |
| ph_disabled = flag; |
| } |
| |
| int tpm_is_ph_disabled(void) |
| { |
| return ph_disabled; |
| } |