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e926136bb2
The current tpm2_pcr_extend is hardcoded using SHA256. Let's make the actual command to the TPM2 configurable so we can support a wider range of algorithms and keep the current command line as-is i.e limited to SHA256 only Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org>
470 lines
13 KiB
C
470 lines
13 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 <linux/bitops.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, u32 algorithm,
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const u8 *digest, u32 digest_len)
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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 + 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(algorithm), /* 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, digest_len);
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offset += 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).
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*/
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properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
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sizeof(u8) + 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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u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
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{
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const u8 command_v2[10] = {
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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_GET_RANDOM),
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};
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u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
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const size_t data_size_offset = 10;
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const size_t data_offset = 12;
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size_t response_length = sizeof(response);
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u32 data_size;
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u8 *out = data;
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while (count > 0) {
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u32 this_bytes = min((size_t)count,
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sizeof(response) - data_offset);
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u32 err;
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if (pack_byte_string(buf, sizeof(buf), "sw",
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0, command_v2, sizeof(command_v2),
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sizeof(command_v2), this_bytes))
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return TPM_LIB_ERROR;
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err = tpm_sendrecv_command(dev, buf, response,
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&response_length);
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if (err)
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return err;
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if (unpack_byte_string(response, response_length, "w",
|
|
data_size_offset, &data_size))
|
|
return TPM_LIB_ERROR;
|
|
if (data_size > this_bytes)
|
|
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;
|
|
}
|