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![Simon Glass](/assets/img/avatar_default.png)
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>
528 lines
12 KiB
C
528 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2013
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* Reinhard Pfau, Guntermann & Drunck GmbH, reinhard.pfau@gdsys.cc
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*/
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#include <common.h>
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#include <malloc.h>
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#include <fs.h>
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#include <i2c.h>
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#include <mmc.h>
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#include <tpm-v1.h>
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#include <u-boot/sha1.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <pca9698.h>
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#include "hre.h"
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/* other constants */
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enum {
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ESDHC_BOOT_IMAGE_SIG_OFS = 0x40,
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ESDHC_BOOT_IMAGE_SIZE_OFS = 0x48,
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ESDHC_BOOT_IMAGE_ADDR_OFS = 0x50,
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ESDHC_BOOT_IMAGE_TARGET_OFS = 0x58,
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ESDHC_BOOT_IMAGE_ENTRY_OFS = 0x60,
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};
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enum {
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I2C_SOC_0 = 0,
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I2C_SOC_1 = 1,
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};
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enum access_mode {
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HREG_NONE = 0,
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HREG_RD = 1,
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HREG_WR = 2,
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HREG_RDWR = 3,
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};
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/* register constants */
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enum {
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FIX_HREG_DEVICE_ID_HASH = 0,
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FIX_HREG_UNUSED1 = 1,
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FIX_HREG_UNUSED2 = 2,
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FIX_HREG_VENDOR = 3,
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COUNT_FIX_HREGS
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};
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static struct h_reg pcr_hregs[24];
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static struct h_reg fix_hregs[COUNT_FIX_HREGS];
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static struct h_reg var_hregs[8];
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/* hre opcodes */
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enum {
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/* opcodes w/o data */
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HRE_NOP = 0x00,
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HRE_SYNC = HRE_NOP,
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HRE_CHECK0 = 0x01,
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/* opcodes w/o data, w/ sync dst */
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/* opcodes w/ data */
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HRE_LOAD = 0x81,
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/* opcodes w/data, w/sync dst */
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HRE_XOR = 0xC1,
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HRE_AND = 0xC2,
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HRE_OR = 0xC3,
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HRE_EXTEND = 0xC4,
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HRE_LOADKEY = 0xC5,
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};
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/* hre errors */
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enum {
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HRE_E_OK = 0,
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HRE_E_TPM_FAILURE,
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HRE_E_INVALID_HREG,
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};
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static uint64_t device_id;
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static uint64_t device_cl;
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static uint64_t device_type;
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static uint32_t platform_key_handle;
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static uint32_t hre_tpm_err;
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static int hre_err = HRE_E_OK;
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#define IS_PCR_HREG(spec) ((spec) & 0x20)
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#define IS_FIX_HREG(spec) (((spec) & 0x38) == 0x08)
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#define IS_VAR_HREG(spec) (((spec) & 0x38) == 0x10)
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#define HREG_IDX(spec) ((spec) & (IS_PCR_HREG(spec) ? 0x1f : 0x7))
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static const uint8_t vendor[] = "Guntermann & Drunck";
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/**
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* @brief get the size of a given (TPM) NV area
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* @param tpm TPM device
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* @param index NV index of the area to get size for
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* @param size pointer to the size
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* @return 0 on success, != 0 on error
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*/
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static int get_tpm_nv_size(struct udevice *tpm, uint32_t index, uint32_t *size)
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{
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uint32_t err;
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uint8_t info[72];
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uint8_t *ptr;
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uint16_t v16;
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err = tpm_get_capability(tpm, TPM_CAP_NV_INDEX, index,
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info, sizeof(info));
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if (err) {
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printf("tpm_get_capability(CAP_NV_INDEX, %08x) failed: %u\n",
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index, err);
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return 1;
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}
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/* skip tag and nvIndex */
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ptr = info + 6;
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/* skip 2 pcr info fields */
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v16 = get_unaligned_be16(ptr);
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ptr += 2 + v16 + 1 + 20;
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v16 = get_unaligned_be16(ptr);
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ptr += 2 + v16 + 1 + 20;
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/* skip permission and flags */
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ptr += 6 + 3;
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*size = get_unaligned_be32(ptr);
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return 0;
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}
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/**
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* @brief search for a key by usage auth and pub key hash.
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* @param tpm TPM device
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* @param auth usage auth of the key to search for
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* @param pubkey_digest (SHA1) hash of the pub key structure of the key
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* @param[out] handle the handle of the key iff found
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* @return 0 if key was found in TPM; != 0 if not.
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*/
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static int find_key(struct udevice *tpm, const uint8_t auth[20],
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const uint8_t pubkey_digest[20], uint32_t *handle)
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{
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uint16_t key_count;
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uint32_t key_handles[10];
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uint8_t buf[288];
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uint8_t *ptr;
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uint32_t err;
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uint8_t digest[20];
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size_t buf_len;
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unsigned int i;
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/* fetch list of already loaded keys in the TPM */
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err = tpm_get_capability(tpm, TPM_CAP_HANDLE, TPM_RT_KEY, buf,
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sizeof(buf));
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if (err)
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return -1;
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key_count = get_unaligned_be16(buf);
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ptr = buf + 2;
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for (i = 0; i < key_count; ++i, ptr += 4)
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key_handles[i] = get_unaligned_be32(ptr);
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/* now search a(/ the) key which we can access with the given auth */
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for (i = 0; i < key_count; ++i) {
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buf_len = sizeof(buf);
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err = tpm_get_pub_key_oiap(tpm, key_handles[i], auth, buf,
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&buf_len);
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if (err && err != TPM_AUTHFAIL)
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return -1;
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if (err)
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continue;
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sha1_csum(buf, buf_len, digest);
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if (!memcmp(digest, pubkey_digest, 20)) {
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*handle = key_handles[i];
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return 0;
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}
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}
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return 1;
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}
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/**
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* @brief read CCDM common data from TPM NV
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* @param tpm TPM device
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* @return 0 if CCDM common data was found and read, !=0 if something failed.
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*/
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static int read_common_data(struct udevice *tpm)
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{
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uint32_t size = 0;
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uint32_t err;
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uint8_t buf[256];
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sha1_context ctx;
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if (get_tpm_nv_size(tpm, NV_COMMON_DATA_INDEX, &size) ||
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size < NV_COMMON_DATA_MIN_SIZE)
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return 1;
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err = tpm_nv_read_value(tpm, NV_COMMON_DATA_INDEX,
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buf, min(sizeof(buf), size));
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if (err) {
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printf("tpm_nv_read_value() failed: %u\n", err);
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return 1;
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}
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device_id = get_unaligned_be64(buf);
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device_cl = get_unaligned_be64(buf + 8);
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device_type = get_unaligned_be64(buf + 16);
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sha1_starts(&ctx);
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sha1_update(&ctx, buf, 24);
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sha1_finish(&ctx, fix_hregs[FIX_HREG_DEVICE_ID_HASH].digest);
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fix_hregs[FIX_HREG_DEVICE_ID_HASH].valid = true;
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platform_key_handle = get_unaligned_be32(buf + 24);
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return 0;
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}
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/**
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* @brief get pointer to hash register by specification
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* @param spec specification of a hash register
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* @return pointer to hash register or NULL if @a spec does not qualify a
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* valid hash register; NULL else.
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*/
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static struct h_reg *get_hreg(uint8_t spec)
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{
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uint8_t idx;
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idx = HREG_IDX(spec);
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if (IS_FIX_HREG(spec)) {
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if (idx < ARRAY_SIZE(fix_hregs))
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return fix_hregs + idx;
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hre_err = HRE_E_INVALID_HREG;
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} else if (IS_PCR_HREG(spec)) {
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if (idx < ARRAY_SIZE(pcr_hregs))
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return pcr_hregs + idx;
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hre_err = HRE_E_INVALID_HREG;
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} else if (IS_VAR_HREG(spec)) {
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if (idx < ARRAY_SIZE(var_hregs))
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return var_hregs + idx;
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hre_err = HRE_E_INVALID_HREG;
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}
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return NULL;
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}
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/**
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* @brief get pointer of a hash register by specification and usage.
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* @param tpm TPM device
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* @param spec specification of a hash register
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* @param mode access mode (read or write or read/write)
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* @return pointer to hash register if found and valid; NULL else.
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*
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* This func uses @a get_reg() to determine the hash register for a given spec.
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* If a register is found it is validated according to the desired access mode.
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* The value of automatic registers (PCR register and fixed registers) is
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* loaded or computed on read access.
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*/
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static struct h_reg *access_hreg(struct udevice *tpm, uint8_t spec,
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enum access_mode mode)
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{
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struct h_reg *result;
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result = get_hreg(spec);
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if (!result)
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return NULL;
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if (mode & HREG_WR) {
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if (IS_FIX_HREG(spec)) {
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hre_err = HRE_E_INVALID_HREG;
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return NULL;
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}
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}
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if (mode & HREG_RD) {
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if (!result->valid) {
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if (IS_PCR_HREG(spec)) {
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hre_tpm_err = tpm_pcr_read(tpm, HREG_IDX(spec),
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result->digest, 20);
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result->valid = (hre_tpm_err == TPM_SUCCESS);
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} else if (IS_FIX_HREG(spec)) {
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switch (HREG_IDX(spec)) {
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case FIX_HREG_DEVICE_ID_HASH:
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read_common_data(tpm);
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break;
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case FIX_HREG_VENDOR:
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memcpy(result->digest, vendor, 20);
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result->valid = true;
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break;
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}
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} else {
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result->valid = true;
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}
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}
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if (!result->valid) {
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hre_err = HRE_E_INVALID_HREG;
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return NULL;
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}
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}
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return result;
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}
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static void *compute_and(void *_dst, const void *_src, size_t n)
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{
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uint8_t *dst = _dst;
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const uint8_t *src = _src;
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size_t i;
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for (i = n; i-- > 0; )
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*dst++ &= *src++;
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return _dst;
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}
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static void *compute_or(void *_dst, const void *_src, size_t n)
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{
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uint8_t *dst = _dst;
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const uint8_t *src = _src;
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size_t i;
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for (i = n; i-- > 0; )
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*dst++ |= *src++;
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return _dst;
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}
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static void *compute_xor(void *_dst, const void *_src, size_t n)
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{
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uint8_t *dst = _dst;
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const uint8_t *src = _src;
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size_t i;
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for (i = n; i-- > 0; )
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*dst++ ^= *src++;
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return _dst;
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}
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static void *compute_extend(void *_dst, const void *_src, size_t n)
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{
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uint8_t digest[20];
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sha1_context ctx;
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sha1_starts(&ctx);
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sha1_update(&ctx, _dst, n);
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sha1_update(&ctx, _src, n);
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sha1_finish(&ctx, digest);
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memcpy(_dst, digest, min(n, sizeof(digest)));
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return _dst;
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}
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static int hre_op_loadkey(struct udevice *tpm, struct h_reg *src_reg,
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struct h_reg *dst_reg, const void *key,
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size_t key_size)
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{
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uint32_t parent_handle;
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uint32_t key_handle;
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if (!src_reg || !dst_reg || !src_reg->valid || !dst_reg->valid)
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return -1;
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if (find_key(tpm, src_reg->digest, dst_reg->digest, &parent_handle))
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return -1;
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hre_tpm_err = tpm_load_key2_oiap(tpm, parent_handle, key, key_size,
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src_reg->digest, &key_handle);
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if (hre_tpm_err) {
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hre_err = HRE_E_TPM_FAILURE;
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return -1;
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}
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return 0;
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}
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/**
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* @brief executes the next opcode on the hash register engine.
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* @param tpm TPM device
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* @param[in,out] ip pointer to the opcode (instruction pointer)
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* @param[in,out] code_size (remaining) size of the code
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* @return new instruction pointer on success, NULL on error.
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*/
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static const uint8_t *hre_execute_op(struct udevice *tpm, const uint8_t **ip,
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size_t *code_size)
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{
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bool dst_modified = false;
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uint32_t ins;
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uint8_t opcode;
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uint8_t src_spec;
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uint8_t dst_spec;
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uint16_t data_size;
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struct h_reg *src_reg, *dst_reg;
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uint8_t buf[20];
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const uint8_t *src_buf, *data;
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uint8_t *ptr;
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int i;
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void * (*bin_func)(void *, const void *, size_t);
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if (*code_size < 4)
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return NULL;
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ins = get_unaligned_be32(*ip);
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opcode = **ip;
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data = *ip + 4;
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src_spec = (ins >> 18) & 0x3f;
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dst_spec = (ins >> 12) & 0x3f;
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data_size = (ins & 0x7ff);
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debug("HRE: ins=%08x (op=%02x, s=%02x, d=%02x, L=%d)\n", ins,
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opcode, src_spec, dst_spec, data_size);
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if ((opcode & 0x80) && (data_size + 4) > *code_size)
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return NULL;
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src_reg = access_hreg(tpm, src_spec, HREG_RD);
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if (hre_err || hre_tpm_err)
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return NULL;
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dst_reg = access_hreg(tpm, dst_spec,
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(opcode & 0x40) ? HREG_RDWR : HREG_WR);
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if (hre_err || hre_tpm_err)
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return NULL;
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switch (opcode) {
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case HRE_NOP:
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goto end;
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case HRE_CHECK0:
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if (src_reg) {
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for (i = 0; i < 20; ++i) {
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if (src_reg->digest[i])
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return NULL;
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}
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}
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break;
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case HRE_LOAD:
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bin_func = memcpy;
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goto do_bin_func;
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case HRE_XOR:
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bin_func = compute_xor;
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goto do_bin_func;
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case HRE_AND:
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bin_func = compute_and;
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goto do_bin_func;
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case HRE_OR:
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bin_func = compute_or;
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goto do_bin_func;
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case HRE_EXTEND:
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bin_func = compute_extend;
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do_bin_func:
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if (!dst_reg)
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return NULL;
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if (src_reg) {
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src_buf = src_reg->digest;
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} else {
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if (!data_size) {
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memset(buf, 0, 20);
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src_buf = buf;
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} else if (data_size == 1) {
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memset(buf, *data, 20);
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src_buf = buf;
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} else if (data_size >= 20) {
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src_buf = data;
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} else {
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src_buf = buf;
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for (ptr = (uint8_t *)src_buf, i = 20; i > 0;
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i -= data_size, ptr += data_size)
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memcpy(ptr, data,
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min_t(size_t, i, data_size));
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}
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}
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bin_func(dst_reg->digest, src_buf, 20);
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dst_reg->valid = true;
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dst_modified = true;
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break;
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case HRE_LOADKEY:
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if (hre_op_loadkey(tpm, src_reg, dst_reg, data, data_size))
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return NULL;
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break;
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default:
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return NULL;
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}
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if (dst_reg && dst_modified && IS_PCR_HREG(dst_spec)) {
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hre_tpm_err = tpm_extend(tpm, HREG_IDX(dst_spec),
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dst_reg->digest, dst_reg->digest);
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if (hre_tpm_err) {
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hre_err = HRE_E_TPM_FAILURE;
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return NULL;
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}
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}
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end:
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*ip += 4;
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*code_size -= 4;
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if (opcode & 0x80) {
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*ip += data_size;
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*code_size -= data_size;
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}
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return *ip;
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}
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/**
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* @brief runs a program on the hash register engine.
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* @param tpm TPM device
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* @param code pointer to the (HRE) code.
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* @param code_size size of the code (in bytes).
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* @return 0 on success, != 0 on failure.
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*/
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int hre_run_program(struct udevice *tpm, const uint8_t *code, size_t code_size)
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{
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size_t code_left;
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const uint8_t *ip = code;
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code_left = code_size;
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|
hre_tpm_err = 0;
|
|
hre_err = HRE_E_OK;
|
|
while (code_left > 0)
|
|
if (!hre_execute_op(tpm, &ip, &code_left))
|
|
return -1;
|
|
|
|
return hre_err;
|
|
}
|
|
|
|
int hre_verify_program(struct key_program *prg)
|
|
{
|
|
uint32_t crc;
|
|
|
|
crc = crc32(0, prg->code, prg->code_size);
|
|
|
|
if (crc != prg->code_crc) {
|
|
printf("HRC crc mismatch: %08x != %08x\n",
|
|
crc, prg->code_crc);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|