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https://github.com/brain-hackers/u-boot-brain
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abdc7b8a2d
At present many TPM calls assume there is only one TPM in the system and look up this TPM themselves. This is inconsistent with driver model, which expects all driver methods to have a device parameter. Update the code to correct this. Signed-off-by: Simon Glass <sjg@chromium.org>
424 lines
12 KiB
C
424 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Bootlin
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* Author: Miquel Raynal <miquel.raynal@bootlin.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <tpm-common.h>
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#include <tpm-v2.h>
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#include "tpm-utils.h"
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u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
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{
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const u8 command_v2[12] = {
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tpm_u16(TPM2_ST_NO_SESSIONS),
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tpm_u32(12),
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tpm_u32(TPM2_CC_STARTUP),
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tpm_u16(mode),
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};
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int ret;
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/*
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* Note TPM2_Startup command will return RC_SUCCESS the first time,
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* but will return RC_INITIALIZE otherwise.
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*/
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ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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if (ret && ret != TPM2_RC_INITIALIZE)
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return ret;
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return 0;
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}
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u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
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{
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const u8 command_v2[12] = {
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tpm_u16(TPM2_ST_NO_SESSIONS),
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tpm_u32(11),
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tpm_u32(TPM2_CC_SELF_TEST),
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full_test,
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};
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
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const ssize_t pw_sz)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(27 + pw_sz), /* Length */
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tpm_u32(TPM2_CC_CLEAR), /* Command code */
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/* HANDLE */
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tpm_u32(handle), /* TPM resource handle */
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/* AUTH_SESSION */
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tpm_u32(9 + pw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* Session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(pw_sz), /* Size of <hmac/password> */
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/* STRING(pw) <hmac/password> (if any) */
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};
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unsigned int offset = 27;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the password (if any)
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
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offset, pw, pw_sz);
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offset += pw_sz;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_pcr_extend(struct udevice *dev, u32 index, const uint8_t *digest)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(33 + TPM2_DIGEST_LEN), /* Length */
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tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */
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/* HANDLE */
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tpm_u32(index), /* Handle (PCR Index) */
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/* AUTH_SESSION */
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tpm_u32(9), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* Session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(0), /* Size of <hmac/password> */
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/* <hmac/password> (if any) */
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tpm_u32(1), /* Count (number of hashes) */
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tpm_u16(TPM2_ALG_SHA256), /* Algorithm of the hash */
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/* STRING(digest) Digest */
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};
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unsigned int offset = 33;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the digest
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
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offset, digest, TPM2_DIGEST_LEN);
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offset += TPM2_DIGEST_LEN;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
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void *data, unsigned int *updates)
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{
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u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
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tpm_u32(17 + idx_array_sz), /* Length */
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tpm_u32(TPM2_CC_PCR_READ), /* Command code */
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/* TPML_PCR_SELECTION */
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tpm_u32(1), /* Number of selections */
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tpm_u16(TPM2_ALG_SHA256), /* Algorithm of the hash */
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idx_array_sz, /* Array size for selection */
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/* bitmap(idx) Selected PCR bitmap */
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};
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size_t response_len = COMMAND_BUFFER_SIZE;
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u8 response[COMMAND_BUFFER_SIZE];
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unsigned int pcr_sel_idx = idx / 8;
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u8 pcr_sel_bit = BIT(idx % 8);
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unsigned int counter = 0;
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int ret;
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if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
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17 + pcr_sel_idx, pcr_sel_bit))
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return TPM_LIB_ERROR;
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ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
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if (ret)
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return ret;
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if (unpack_byte_string(response, response_len, "ds",
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10, &counter,
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response_len - TPM2_DIGEST_LEN, data,
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TPM2_DIGEST_LEN))
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return TPM_LIB_ERROR;
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if (updates)
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*updates = counter;
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return 0;
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}
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u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
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void *buf, size_t prop_count)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
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tpm_u32(22), /* Length */
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tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */
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tpm_u32(capability), /* Capability */
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tpm_u32(property), /* Property */
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tpm_u32(prop_count), /* Property count */
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};
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u8 response[COMMAND_BUFFER_SIZE];
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size_t response_len = COMMAND_BUFFER_SIZE;
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unsigned int properties_off;
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int ret;
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ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
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if (ret)
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return ret;
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/*
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* In the response buffer, the properties are located after the:
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* tag (u16), response size (u32), response code (u32),
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* YES/NO flag (u8), TPM_CAP (u32) and TPMU_CAPABILITIES (u32).
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*/
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properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
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sizeof(u8) + sizeof(u32) + sizeof(u32);
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memcpy(buf, &response[properties_off], response_len - properties_off);
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return 0;
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}
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u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(27 + pw_sz), /* Length */
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tpm_u32(TPM2_CC_DAM_RESET), /* Command code */
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/* HANDLE */
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tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */
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/* AUTH_SESSION */
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tpm_u32(9 + pw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* Session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(pw_sz), /* Size of <hmac/password> */
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/* STRING(pw) <hmac/password> (if any) */
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};
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unsigned int offset = 27;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the password (if any)
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
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offset, pw, pw_sz);
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offset += pw_sz;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
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const ssize_t pw_sz, unsigned int max_tries,
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unsigned int recovery_time,
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unsigned int lockout_recovery)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(27 + pw_sz + 12), /* Length */
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tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
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/* HANDLE */
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tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */
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/* AUTH_SESSION */
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tpm_u32(9 + pw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* Session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(pw_sz), /* Size of <hmac/password> */
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/* STRING(pw) <hmac/password> (if any) */
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/* LOCKOUT PARAMETERS */
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/* tpm_u32(max_tries) Max tries (0, always lock) */
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/* tpm_u32(recovery_time) Recovery time (0, no lock) */
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/* tpm_u32(lockout_recovery) Lockout recovery */
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};
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unsigned int offset = 27;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the password (if any)
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* - max tries
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* - recovery time
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* - lockout recovery
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
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offset, pw, pw_sz,
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offset + pw_sz, max_tries,
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offset + pw_sz + 4, recovery_time,
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offset + pw_sz + 8, lockout_recovery);
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offset += pw_sz + 12;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
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const ssize_t newpw_sz, const char *oldpw,
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const ssize_t oldpw_sz)
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{
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unsigned int offset = 27;
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
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tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
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/* HANDLE */
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tpm_u32(handle), /* TPM resource handle */
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/* AUTH_SESSION */
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tpm_u32(9 + oldpw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* Session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(oldpw_sz) /* Size of <hmac/password> */
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/* STRING(oldpw) <hmac/password> (if any) */
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/* TPM2B_AUTH (TPM2B_DIGEST) */
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/* tpm_u16(newpw_sz) Digest size, new pw length */
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/* STRING(newpw) Digest buffer, new pw */
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};
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the old password (if any)
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* - size of the new password
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* - new password
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
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offset, oldpw, oldpw_sz,
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offset + oldpw_sz, newpw_sz,
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offset + oldpw_sz + 2, newpw, newpw_sz);
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offset += oldpw_sz + 2 + newpw_sz;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
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const ssize_t pw_sz, u32 index, const char *key)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
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tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */
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/* HANDLE */
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tpm_u32(TPM2_RH_PLATFORM), /* TPM resource handle */
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/* AUTH_SESSION */
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tpm_u32(9 + pw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(pw_sz) /* Size of <hmac/password> */
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/* STRING(pw) <hmac/password> (if any) */
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/* TPM2B_AUTH (TPM2B_DIGEST) */
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/* tpm_u16(TPM2_DIGEST_LEN) Digest size length */
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/* STRING(key) Digest buffer (PCR key) */
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/* TPMI_ALG_HASH */
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/* tpm_u16(TPM2_ALG_SHA256) Algorithm of the hash */
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/* TPMI_DH_PCR */
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/* tpm_u32(index), PCR Index */
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};
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unsigned int offset = 27;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the password (if any)
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* - the PCR key length
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* - the PCR key
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* - the hash algorithm
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* - the PCR index
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
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offset, pw, pw_sz,
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offset + pw_sz, TPM2_DIGEST_LEN,
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offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
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offset + pw_sz + 2 + TPM2_DIGEST_LEN,
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TPM2_ALG_SHA256,
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offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
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offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
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const ssize_t pw_sz, u32 index, const char *key,
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const ssize_t key_sz)
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{
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u8 command_v2[COMMAND_BUFFER_SIZE] = {
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tpm_u16(TPM2_ST_SESSIONS), /* TAG */
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tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
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tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */
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/* HANDLE */
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tpm_u32(index), /* Handle (PCR Index) */
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/* AUTH_SESSION */
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tpm_u32(9 + pw_sz), /* Authorization size */
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tpm_u32(TPM2_RS_PW), /* session handle */
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tpm_u16(0), /* Size of <nonce> */
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/* <nonce> (if any) */
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0, /* Attributes: Cont/Excl/Rst */
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tpm_u16(pw_sz), /* Size of <hmac/password> */
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/* STRING(pw) <hmac/password> (if any) */
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/* TPM2B_DIGEST */
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/* tpm_u16(key_sz) Key length */
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/* STRING(key) Key */
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};
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unsigned int offset = 27;
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int ret;
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/*
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* Fill the command structure starting from the first buffer:
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* - the password (if any)
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* - the number of digests, 1 in our case
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* - the algorithm, sha256 in our case
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* - the digest (64 bytes)
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*/
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ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
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offset, pw, pw_sz,
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offset + pw_sz, key_sz,
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offset + pw_sz + 2, key, key_sz);
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offset += pw_sz + 2 + key_sz;
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if (ret)
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return TPM_LIB_ERROR;
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return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
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}
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