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-rw-r--r--board/gdsys/a38x/hre.c516
1 files changed, 516 insertions, 0 deletions
diff --git a/board/gdsys/a38x/hre.c b/board/gdsys/a38x/hre.c
new file mode 100644
index 0000000000..1689d44db6
--- /dev/null
+++ b/board/gdsys/a38x/hre.c
@@ -0,0 +1,516 @@
+/*
+ * (C) Copyright 2013
+ * Reinhard Pfau, Guntermann & Drunck GmbH, reinhard.pfau@gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <fs.h>
+#include <i2c.h>
+#include <mmc.h>
+#include <tpm.h>
+#include <u-boot/sha1.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+#include <pca9698.h>
+
+#include "hre.h"
+
+/* other constants */
+enum {
+ ESDHC_BOOT_IMAGE_SIG_OFS = 0x40,
+ ESDHC_BOOT_IMAGE_SIZE_OFS = 0x48,
+ ESDHC_BOOT_IMAGE_ADDR_OFS = 0x50,
+ ESDHC_BOOT_IMAGE_TARGET_OFS = 0x58,
+ ESDHC_BOOT_IMAGE_ENTRY_OFS = 0x60,
+};
+
+enum {
+ I2C_SOC_0 = 0,
+ I2C_SOC_1 = 1,
+};
+
+enum access_mode {
+ HREG_NONE = 0,
+ HREG_RD = 1,
+ HREG_WR = 2,
+ HREG_RDWR = 3,
+};
+
+/* register constants */
+enum {
+ FIX_HREG_DEVICE_ID_HASH = 0,
+ FIX_HREG_UNUSED1 = 1,
+ FIX_HREG_UNUSED2 = 2,
+ FIX_HREG_VENDOR = 3,
+ COUNT_FIX_HREGS
+};
+
+static struct h_reg pcr_hregs[24];
+static struct h_reg fix_hregs[COUNT_FIX_HREGS];
+static struct h_reg var_hregs[8];
+
+/* hre opcodes */
+enum {
+ /* opcodes w/o data */
+ HRE_NOP = 0x00,
+ HRE_SYNC = HRE_NOP,
+ HRE_CHECK0 = 0x01,
+ /* opcodes w/o data, w/ sync dst */
+ /* opcodes w/ data */
+ HRE_LOAD = 0x81,
+ /* opcodes w/data, w/sync dst */
+ HRE_XOR = 0xC1,
+ HRE_AND = 0xC2,
+ HRE_OR = 0xC3,
+ HRE_EXTEND = 0xC4,
+ HRE_LOADKEY = 0xC5,
+};
+
+/* hre errors */
+enum {
+ HRE_E_OK = 0,
+ HRE_E_TPM_FAILURE,
+ HRE_E_INVALID_HREG,
+};
+
+static uint64_t device_id;
+static uint64_t device_cl;
+static uint64_t device_type;
+
+static uint32_t platform_key_handle;
+
+static uint32_t hre_tpm_err;
+static int hre_err = HRE_E_OK;
+
+#define IS_PCR_HREG(spec) ((spec) & 0x20)
+#define IS_FIX_HREG(spec) (((spec) & 0x38) == 0x08)
+#define IS_VAR_HREG(spec) (((spec) & 0x38) == 0x10)
+#define HREG_IDX(spec) ((spec) & (IS_PCR_HREG(spec) ? 0x1f : 0x7))
+
+static const uint8_t vendor[] = "Guntermann & Drunck";
+
+/**
+ * @brief get the size of a given (TPM) NV area
+ * @param index NV index of the area to get size for
+ * @param size pointer to the size
+ * @return 0 on success, != 0 on error
+ */
+static int get_tpm_nv_size(uint32_t index, uint32_t *size)
+{
+ uint32_t err;
+ uint8_t info[72];
+ uint8_t *ptr;
+ uint16_t v16;
+
+ err = tpm_get_capability(TPM_CAP_NV_INDEX, index,
+ info, sizeof(info));
+ if (err) {
+ printf("tpm_get_capability(CAP_NV_INDEX, %08x) failed: %u\n",
+ index, err);
+ return 1;
+ }
+
+ /* skip tag and nvIndex */
+ ptr = info + 6;
+ /* skip 2 pcr info fields */
+ v16 = get_unaligned_be16(ptr);
+ ptr += 2 + v16 + 1 + 20;
+ v16 = get_unaligned_be16(ptr);
+ ptr += 2 + v16 + 1 + 20;
+ /* skip permission and flags */
+ ptr += 6 + 3;
+
+ *size = get_unaligned_be32(ptr);
+ return 0;
+}
+
+/**
+ * @brief search for a key by usage auth and pub key hash.
+ * @param auth usage auth of the key to search for
+ * @param pubkey_digest (SHA1) hash of the pub key structure of the key
+ * @param[out] handle the handle of the key iff found
+ * @return 0 if key was found in TPM; != 0 if not.
+ */
+static int find_key(const uint8_t auth[20], const uint8_t pubkey_digest[20],
+ uint32_t *handle)
+{
+ uint16_t key_count;
+ uint32_t key_handles[10];
+ uint8_t buf[288];
+ uint8_t *ptr;
+ uint32_t err;
+ uint8_t digest[20];
+ size_t buf_len;
+ unsigned int i;
+
+ /* fetch list of already loaded keys in the TPM */
+ err = tpm_get_capability(TPM_CAP_HANDLE, TPM_RT_KEY, buf, sizeof(buf));
+ if (err)
+ return -1;
+ key_count = get_unaligned_be16(buf);
+ ptr = buf + 2;
+ for (i = 0; i < key_count; ++i, ptr += 4)
+ key_handles[i] = get_unaligned_be32(ptr);
+
+ /* now search a(/ the) key which we can access with the given auth */
+ for (i = 0; i < key_count; ++i) {
+ buf_len = sizeof(buf);
+ err = tpm_get_pub_key_oiap(key_handles[i], auth, buf, &buf_len);
+ if (err && err != TPM_AUTHFAIL)
+ return -1;
+ if (err)
+ continue;
+ sha1_csum(buf, buf_len, digest);
+ if (!memcmp(digest, pubkey_digest, 20)) {
+ *handle = key_handles[i];
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/**
+ * @brief read CCDM common data from TPM NV
+ * @return 0 if CCDM common data was found and read, !=0 if something failed.
+ */
+static int read_common_data(void)
+{
+ uint32_t size = 0;
+ uint32_t err;
+ uint8_t buf[256];
+ sha1_context ctx;
+
+ if (get_tpm_nv_size(NV_COMMON_DATA_INDEX, &size) ||
+ size < NV_COMMON_DATA_MIN_SIZE)
+ return 1;
+ err = tpm_nv_read_value(NV_COMMON_DATA_INDEX,
+ buf, min(sizeof(buf), size));
+ if (err) {
+ printf("tpm_nv_read_value() failed: %u\n", err);
+ return 1;
+ }
+
+ device_id = get_unaligned_be64(buf);
+ device_cl = get_unaligned_be64(buf + 8);
+ device_type = get_unaligned_be64(buf + 16);
+
+ sha1_starts(&ctx);
+ sha1_update(&ctx, buf, 24);
+ sha1_finish(&ctx, fix_hregs[FIX_HREG_DEVICE_ID_HASH].digest);
+ fix_hregs[FIX_HREG_DEVICE_ID_HASH].valid = true;
+
+ platform_key_handle = get_unaligned_be32(buf + 24);
+
+ return 0;
+}
+
+/**
+ * @brief get pointer to hash register by specification
+ * @param spec specification of a hash register
+ * @return pointer to hash register or NULL if @a spec does not qualify a
+ * valid hash register; NULL else.
+ */
+static struct h_reg *get_hreg(uint8_t spec)
+{
+ uint8_t idx;
+
+ idx = HREG_IDX(spec);
+ if (IS_FIX_HREG(spec)) {
+ if (idx < ARRAY_SIZE(fix_hregs))
+ return fix_hregs + idx;
+ hre_err = HRE_E_INVALID_HREG;
+ } else if (IS_PCR_HREG(spec)) {
+ if (idx < ARRAY_SIZE(pcr_hregs))
+ return pcr_hregs + idx;
+ hre_err = HRE_E_INVALID_HREG;
+ } else if (IS_VAR_HREG(spec)) {
+ if (idx < ARRAY_SIZE(var_hregs))
+ return var_hregs + idx;
+ hre_err = HRE_E_INVALID_HREG;
+ }
+ return NULL;
+}
+
+/**
+ * @brief get pointer of a hash register by specification and usage.
+ * @param spec specification of a hash register
+ * @param mode access mode (read or write or read/write)
+ * @return pointer to hash register if found and valid; NULL else.
+ *
+ * This func uses @a get_reg() to determine the hash register for a given spec.
+ * If a register is found it is validated according to the desired access mode.
+ * The value of automatic registers (PCR register and fixed registers) is
+ * loaded or computed on read access.
+ */
+static struct h_reg *access_hreg(uint8_t spec, enum access_mode mode)
+{
+ struct h_reg *result;
+
+ result = get_hreg(spec);
+ if (!result)
+ return NULL;
+
+ if (mode & HREG_WR) {
+ if (IS_FIX_HREG(spec)) {
+ hre_err = HRE_E_INVALID_HREG;
+ return NULL;
+ }
+ }
+ if (mode & HREG_RD) {
+ if (!result->valid) {
+ if (IS_PCR_HREG(spec)) {
+ hre_tpm_err = tpm_pcr_read(HREG_IDX(spec),
+ result->digest, 20);
+ result->valid = (hre_tpm_err == TPM_SUCCESS);
+ } else if (IS_FIX_HREG(spec)) {
+ switch (HREG_IDX(spec)) {
+ case FIX_HREG_DEVICE_ID_HASH:
+ read_common_data();
+ break;
+ case FIX_HREG_VENDOR:
+ memcpy(result->digest, vendor, 20);
+ result->valid = true;
+ break;
+ }
+ } else {
+ result->valid = true;
+ }
+ }
+ if (!result->valid) {
+ hre_err = HRE_E_INVALID_HREG;
+ return NULL;
+ }
+ }
+
+ return result;
+}
+
+static void *compute_and(void *_dst, const void *_src, size_t n)
+{
+ uint8_t *dst = _dst;
+ const uint8_t *src = _src;
+ size_t i;
+
+ for (i = n; i-- > 0; )
+ *dst++ &= *src++;
+
+ return _dst;
+}
+
+static void *compute_or(void *_dst, const void *_src, size_t n)
+{
+ uint8_t *dst = _dst;
+ const uint8_t *src = _src;
+ size_t i;
+
+ for (i = n; i-- > 0; )
+ *dst++ |= *src++;
+
+ return _dst;
+}
+
+static void *compute_xor(void *_dst, const void *_src, size_t n)
+{
+ uint8_t *dst = _dst;
+ const uint8_t *src = _src;
+ size_t i;
+
+ for (i = n; i-- > 0; )
+ *dst++ ^= *src++;
+
+ return _dst;
+}
+
+static void *compute_extend(void *_dst, const void *_src, size_t n)
+{
+ uint8_t digest[20];
+ sha1_context ctx;
+
+ sha1_starts(&ctx);
+ sha1_update(&ctx, _dst, n);
+ sha1_update(&ctx, _src, n);
+ sha1_finish(&ctx, digest);
+ memcpy(_dst, digest, min(n, sizeof(digest)));
+
+ return _dst;
+}
+
+static int hre_op_loadkey(struct h_reg *src_reg, struct h_reg *dst_reg,
+ const void *key, size_t key_size)
+{
+ uint32_t parent_handle;
+ uint32_t key_handle;
+
+ if (!src_reg || !dst_reg || !src_reg->valid || !dst_reg->valid)
+ return -1;
+ if (find_key(src_reg->digest, dst_reg->digest, &parent_handle))
+ return -1;
+ hre_tpm_err = tpm_load_key2_oiap(parent_handle, key, key_size,
+ src_reg->digest, &key_handle);
+ if (hre_tpm_err) {
+ hre_err = HRE_E_TPM_FAILURE;
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * @brief executes the next opcode on the hash register engine.
+ * @param[in,out] ip pointer to the opcode (instruction pointer)
+ * @param[in,out] code_size (remaining) size of the code
+ * @return new instruction pointer on success, NULL on error.
+ */
+static const uint8_t *hre_execute_op(const uint8_t **ip, size_t *code_size)
+{
+ bool dst_modified = false;
+ uint32_t ins;
+ uint8_t opcode;
+ uint8_t src_spec;
+ uint8_t dst_spec;
+ uint16_t data_size;
+ struct h_reg *src_reg, *dst_reg;
+ uint8_t buf[20];
+ const uint8_t *src_buf, *data;
+ uint8_t *ptr;
+ int i;
+ void * (*bin_func)(void *, const void *, size_t);
+
+ if (*code_size < 4)
+ return NULL;
+
+ ins = get_unaligned_be32(*ip);
+ opcode = **ip;
+ data = *ip + 4;
+ src_spec = (ins >> 18) & 0x3f;
+ dst_spec = (ins >> 12) & 0x3f;
+ data_size = (ins & 0x7ff);
+
+ debug("HRE: ins=%08x (op=%02x, s=%02x, d=%02x, L=%d)\n", ins,
+ opcode, src_spec, dst_spec, data_size);
+
+ if ((opcode & 0x80) && (data_size + 4) > *code_size)
+ return NULL;
+
+ src_reg = access_hreg(src_spec, HREG_RD);
+ if (hre_err || hre_tpm_err)
+ return NULL;
+ dst_reg = access_hreg(dst_spec, (opcode & 0x40) ? HREG_RDWR : HREG_WR);
+ if (hre_err || hre_tpm_err)
+ return NULL;
+
+ switch (opcode) {
+ case HRE_NOP:
+ goto end;
+ case HRE_CHECK0:
+ if (src_reg) {
+ for (i = 0; i < 20; ++i) {
+ if (src_reg->digest[i])
+ return NULL;
+ }
+ }
+ break;
+ case HRE_LOAD:
+ bin_func = memcpy;
+ goto do_bin_func;
+ case HRE_XOR:
+ bin_func = compute_xor;
+ goto do_bin_func;
+ case HRE_AND:
+ bin_func = compute_and;
+ goto do_bin_func;
+ case HRE_OR:
+ bin_func = compute_or;
+ goto do_bin_func;
+ case HRE_EXTEND:
+ bin_func = compute_extend;
+do_bin_func:
+ if (!dst_reg)
+ return NULL;
+ if (src_reg) {
+ src_buf = src_reg->digest;
+ } else {
+ if (!data_size) {
+ memset(buf, 0, 20);
+ src_buf = buf;
+ } else if (data_size == 1) {
+ memset(buf, *data, 20);
+ src_buf = buf;
+ } else if (data_size >= 20) {
+ src_buf = data;
+ } else {
+ src_buf = buf;
+ for (ptr = (uint8_t *)src_buf, i = 20; i > 0;
+ i -= data_size, ptr += data_size)
+ memcpy(ptr, data,
+ min_t(size_t, i, data_size));
+ }
+ }
+ bin_func(dst_reg->digest, src_buf, 20);
+ dst_reg->valid = true;
+ dst_modified = true;
+ break;
+ case HRE_LOADKEY:
+ if (hre_op_loadkey(src_reg, dst_reg, data, data_size))
+ return NULL;
+ break;
+ default:
+ return NULL;
+ }
+
+ if (dst_reg && dst_modified && IS_PCR_HREG(dst_spec)) {
+ hre_tpm_err = tpm_extend(HREG_IDX(dst_spec), dst_reg->digest,
+ dst_reg->digest);
+ if (hre_tpm_err) {
+ hre_err = HRE_E_TPM_FAILURE;
+ return NULL;
+ }
+ }
+end:
+ *ip += 4;
+ *code_size -= 4;
+ if (opcode & 0x80) {
+ *ip += data_size;
+ *code_size -= data_size;
+ }
+
+ return *ip;
+}
+
+/**
+ * @brief runs a program on the hash register engine.
+ * @param code pointer to the (HRE) code.
+ * @param code_size size of the code (in bytes).
+ * @return 0 on success, != 0 on failure.
+ */
+int hre_run_program(const uint8_t *code, size_t code_size)
+{
+ size_t code_left;
+ const uint8_t *ip = code;
+
+ code_left = code_size;
+ hre_tpm_err = 0;
+ hre_err = HRE_E_OK;
+ while (code_left > 0)
+ if (!hre_execute_op(&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;
+}
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