u-boot/cmd/tpm.c

803 lines
20 KiB
C
Raw Normal View History

/*
* Copyright (c) 2013 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <malloc.h>
#include <tpm.h>
#include <asm/unaligned.h>
#include <linux/string.h>
/* Useful constants */
enum {
DIGEST_LENGTH = 20,
/* max lengths, valid for RSA keys <= 2048 bits */
TPM_PUBKEY_MAX_LENGTH = 288,
};
/**
* Print a byte string in hexdecimal format, 16-bytes per line.
*
* @param data byte string to be printed
* @param count number of bytes to be printed
*/
static void print_byte_string(uint8_t *data, size_t count)
{
int i, print_newline = 0;
for (i = 0; i < count; i++) {
printf(" %02x", data[i]);
print_newline = (i % 16 == 15);
if (print_newline)
putc('\n');
}
/* Avoid duplicated newline at the end */
if (!print_newline)
putc('\n');
}
/**
* Convert a text string of hexdecimal values into a byte string.
*
* @param bytes text string of hexdecimal values with no space
* between them
* @param data output buffer for byte string. The caller has to make
* sure it is large enough for storing the output. If
* NULL is passed, a large enough buffer will be allocated,
* and the caller must free it.
* @param count_ptr output variable for the length of byte string
* @return pointer to output buffer
*/
static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
{
char byte[3];
size_t count, length;
int i;
if (!bytes)
return NULL;
length = strlen(bytes);
count = length / 2;
if (!data)
data = malloc(count);
if (!data)
return NULL;
byte[2] = '\0';
for (i = 0; i < length; i += 2) {
byte[0] = bytes[i];
byte[1] = bytes[i + 1];
data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16);
}
if (count_ptr)
*count_ptr = count;
return data;
}
/**
* report_return_code() - Report any error and return failure or success
*
* @param return_code TPM command return code
* @return value of enum command_ret_t
*/
static int report_return_code(int return_code)
{
if (return_code) {
printf("Error: %d\n", return_code);
return CMD_RET_FAILURE;
} else {
return CMD_RET_SUCCESS;
}
}
/**
* Return number of values defined by a type string.
*
* @param type_str type string
* @return number of values of type string
*/
static int type_string_get_num_values(const char *type_str)
{
return strlen(type_str);
}
/**
* Return total size of values defined by a type string.
*
* @param type_str type string
* @return total size of values of type string, or 0 if type string
* contains illegal type character.
*/
static size_t type_string_get_space_size(const char *type_str)
{
size_t size;
for (size = 0; *type_str; type_str++) {
switch (*type_str) {
case 'b':
size += 1;
break;
case 'w':
size += 2;
break;
case 'd':
size += 4;
break;
default:
return 0;
}
}
return size;
}
/**
* Allocate a buffer large enough to hold values defined by a type
* string. The caller has to free the buffer.
*
* @param type_str type string
* @param count pointer for storing size of buffer
* @return pointer to buffer or NULL on error
*/
static void *type_string_alloc(const char *type_str, uint32_t *count)
{
void *data;
size_t size;
size = type_string_get_space_size(type_str);
if (!size)
return NULL;
data = malloc(size);
if (data)
*count = size;
return data;
}
/**
* Pack values defined by a type string into a buffer. The buffer must have
* large enough space.
*
* @param type_str type string
* @param values text strings of values to be packed
* @param data output buffer of values
* @return 0 on success, non-0 on error
*/
static int type_string_pack(const char *type_str, char * const values[],
uint8_t *data)
{
size_t offset;
uint32_t value;
for (offset = 0; *type_str; type_str++, values++) {
value = simple_strtoul(values[0], NULL, 0);
switch (*type_str) {
case 'b':
data[offset] = value;
offset += 1;
break;
case 'w':
put_unaligned_be16(value, data + offset);
offset += 2;
break;
case 'd':
put_unaligned_be32(value, data + offset);
offset += 4;
break;
default:
return -1;
}
}
return 0;
}
/**
* Read values defined by a type string from a buffer, and write these values
* to environment variables.
*
* @param type_str type string
* @param data input buffer of values
* @param vars names of environment variables
* @return 0 on success, non-0 on error
*/
static int type_string_write_vars(const char *type_str, uint8_t *data,
char * const vars[])
{
size_t offset;
uint32_t value;
for (offset = 0; *type_str; type_str++, vars++) {
switch (*type_str) {
case 'b':
value = data[offset];
offset += 1;
break;
case 'w':
value = get_unaligned_be16(data + offset);
offset += 2;
break;
case 'd':
value = get_unaligned_be32(data + offset);
offset += 4;
break;
default:
return -1;
}
if (setenv_ulong(*vars, value))
return -1;
}
return 0;
}
static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
enum tpm_startup_type mode;
if (argc != 2)
return CMD_RET_USAGE;
if (!strcasecmp("TPM_ST_CLEAR", argv[1])) {
mode = TPM_ST_CLEAR;
} else if (!strcasecmp("TPM_ST_STATE", argv[1])) {
mode = TPM_ST_STATE;
} else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) {
mode = TPM_ST_DEACTIVATED;
} else {
printf("Couldn't recognize mode string: %s\n", argv[1]);
return CMD_RET_FAILURE;
}
return report_return_code(tpm_startup(mode));
}
static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, perm, size;
if (argc != 4)
return CMD_RET_USAGE;
index = simple_strtoul(argv[1], NULL, 0);
perm = simple_strtoul(argv[2], NULL, 0);
size = simple_strtoul(argv[3], NULL, 0);
return report_return_code(tpm_nv_define_space(index, perm, size));
}
static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, count, rc;
void *data;
if (argc != 4)
return CMD_RET_USAGE;
index = simple_strtoul(argv[1], NULL, 0);
data = (void *)simple_strtoul(argv[2], NULL, 0);
count = simple_strtoul(argv[3], NULL, 0);
rc = tpm_nv_read_value(index, data, count);
if (!rc) {
puts("area content:\n");
print_byte_string(data, count);
}
return report_return_code(rc);
}
static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, rc;
size_t count;
void *data;
if (argc != 3)
return CMD_RET_USAGE;
index = simple_strtoul(argv[1], NULL, 0);
data = parse_byte_string(argv[2], NULL, &count);
if (!data) {
printf("Couldn't parse byte string %s\n", argv[2]);
return CMD_RET_FAILURE;
}
rc = tpm_nv_write_value(index, data, count);
free(data);
return report_return_code(rc);
}
static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, rc;
uint8_t in_digest[20], out_digest[20];
if (argc != 3)
return CMD_RET_USAGE;
index = simple_strtoul(argv[1], NULL, 0);
if (!parse_byte_string(argv[2], in_digest, NULL)) {
printf("Couldn't parse byte string %s\n", argv[2]);
return CMD_RET_FAILURE;
}
rc = tpm_extend(index, in_digest, out_digest);
if (!rc) {
puts("PCR value after execution of the command:\n");
print_byte_string(out_digest, sizeof(out_digest));
}
return report_return_code(rc);
}
static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, count, rc;
void *data;
if (argc != 4)
return CMD_RET_USAGE;
index = simple_strtoul(argv[1], NULL, 0);
data = (void *)simple_strtoul(argv[2], NULL, 0);
count = simple_strtoul(argv[3], NULL, 0);
rc = tpm_pcr_read(index, data, count);
if (!rc) {
puts("Named PCR content:\n");
print_byte_string(data, count);
}
return report_return_code(rc);
}
static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint16_t presence;
if (argc != 2)
return CMD_RET_USAGE;
presence = (uint16_t)simple_strtoul(argv[1], NULL, 0);
return report_return_code(tpm_tsc_physical_presence(presence));
}
static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t count, rc;
void *data;
if (argc != 3)
return CMD_RET_USAGE;
data = (void *)simple_strtoul(argv[1], NULL, 0);
count = simple_strtoul(argv[2], NULL, 0);
rc = tpm_read_pubek(data, count);
if (!rc) {
puts("pubek value:\n");
print_byte_string(data, count);
}
return report_return_code(rc);
}
static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint8_t state;
if (argc != 2)
return CMD_RET_USAGE;
state = (uint8_t)simple_strtoul(argv[1], NULL, 0);
return report_return_code(tpm_physical_set_deactivated(state));
}
static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t cap_area, sub_cap, rc;
void *cap;
size_t count;
if (argc != 5)
return CMD_RET_USAGE;
cap_area = simple_strtoul(argv[1], NULL, 0);
sub_cap = simple_strtoul(argv[2], NULL, 0);
cap = (void *)simple_strtoul(argv[3], NULL, 0);
count = simple_strtoul(argv[4], NULL, 0);
rc = tpm_get_capability(cap_area, sub_cap, cap, count);
if (!rc) {
puts("capability information:\n");
print_byte_string(cap, count);
}
return report_return_code(rc);
}
#define TPM_COMMAND_NO_ARG(cmd) \
static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
int argc, char * const argv[]) \
{ \
if (argc != 1) \
return CMD_RET_USAGE; \
return report_return_code(cmd()); \
}
TPM_COMMAND_NO_ARG(tpm_init)
TPM_COMMAND_NO_ARG(tpm_self_test_full)
TPM_COMMAND_NO_ARG(tpm_continue_self_test)
TPM_COMMAND_NO_ARG(tpm_force_clear)
TPM_COMMAND_NO_ARG(tpm_physical_enable)
TPM_COMMAND_NO_ARG(tpm_physical_disable)
static int get_tpm(struct udevice **devp)
{
int rc;
rc = uclass_first_device(UCLASS_TPM, devp);
if (rc) {
printf("Could not find TPM (ret=%d)\n", rc);
return CMD_RET_FAILURE;
}
return 0;
}
static int do_tpm_info(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
struct udevice *dev;
char buf[80];
int rc;
rc = get_tpm(&dev);
if (rc)
return rc;
rc = tpm_get_desc(dev, buf, sizeof(buf));
if (rc < 0) {
printf("Couldn't get TPM info (%d)\n", rc);
return CMD_RET_FAILURE;
}
printf("%s\n", buf);
return 0;
}
static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
struct udevice *dev;
void *command;
uint8_t response[1024];
size_t count, response_length = sizeof(response);
uint32_t rc;
command = parse_byte_string(argv[1], NULL, &count);
if (!command) {
printf("Couldn't parse byte string %s\n", argv[1]);
return CMD_RET_FAILURE;
}
rc = get_tpm(&dev);
if (rc)
return rc;
rc = tpm_xfer(dev, command, count, response, &response_length);
free(command);
if (!rc) {
puts("tpm response:\n");
print_byte_string(response, response_length);
}
return report_return_code(rc);
}
static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, perm, size;
if (argc != 4)
return CMD_RET_USAGE;
size = type_string_get_space_size(argv[1]);
if (!size) {
printf("Couldn't parse arguments\n");
return CMD_RET_USAGE;
}
index = simple_strtoul(argv[2], NULL, 0);
perm = simple_strtoul(argv[3], NULL, 0);
return report_return_code(tpm_nv_define_space(index, perm, size));
}
static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, count, err;
void *data;
if (argc < 3)
return CMD_RET_USAGE;
if (argc != 3 + type_string_get_num_values(argv[1]))
return CMD_RET_USAGE;
index = simple_strtoul(argv[2], NULL, 0);
data = type_string_alloc(argv[1], &count);
if (!data) {
printf("Couldn't parse arguments\n");
return CMD_RET_USAGE;
}
err = tpm_nv_read_value(index, data, count);
if (!err) {
if (type_string_write_vars(argv[1], data, argv + 3)) {
printf("Couldn't write to variables\n");
err = ~0;
}
}
free(data);
return report_return_code(err);
}
static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t index, count, err;
void *data;
if (argc < 3)
return CMD_RET_USAGE;
if (argc != 3 + type_string_get_num_values(argv[1]))
return CMD_RET_USAGE;
index = simple_strtoul(argv[2], NULL, 0);
data = type_string_alloc(argv[1], &count);
if (!data) {
printf("Couldn't parse arguments\n");
return CMD_RET_USAGE;
}
if (type_string_pack(argv[1], argv + 3, data)) {
printf("Couldn't parse arguments\n");
free(data);
return CMD_RET_USAGE;
}
err = tpm_nv_write_value(index, data, count);
free(data);
return report_return_code(err);
}
#ifdef CONFIG_TPM_AUTH_SESSIONS
static int do_tpm_oiap(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t auth_handle, err;
err = tpm_oiap(&auth_handle);
return report_return_code(err);
}
static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t parent_handle, key_len, key_handle, err;
uint8_t usage_auth[DIGEST_LENGTH];
void *key;
if (argc < 5)
return CMD_RET_USAGE;
parent_handle = simple_strtoul(argv[1], NULL, 0);
key = (void *)simple_strtoul(argv[2], NULL, 0);
key_len = simple_strtoul(argv[3], NULL, 0);
if (strlen(argv[4]) != 2 * DIGEST_LENGTH)
return CMD_RET_FAILURE;
parse_byte_string(argv[4], usage_auth, NULL);
err = tpm_load_key2_oiap(parent_handle, key, key_len, usage_auth,
&key_handle);
if (!err)
printf("Key handle is 0x%x\n", key_handle);
return report_return_code(err);
}
static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
uint32_t key_handle, err;
uint8_t usage_auth[DIGEST_LENGTH];
uint8_t pub_key_buffer[TPM_PUBKEY_MAX_LENGTH];
size_t pub_key_len = sizeof(pub_key_buffer);
if (argc < 3)
return CMD_RET_USAGE;
key_handle = simple_strtoul(argv[1], NULL, 0);
if (strlen(argv[2]) != 2 * DIGEST_LENGTH)
return CMD_RET_FAILURE;
parse_byte_string(argv[2], usage_auth, NULL);
err = tpm_get_pub_key_oiap(key_handle, usage_auth,
pub_key_buffer, &pub_key_len);
if (!err) {
printf("dump of received pub key structure:\n");
print_byte_string(pub_key_buffer, pub_key_len);
}
return report_return_code(err);
}
TPM_COMMAND_NO_ARG(tpm_end_oiap)
#endif /* CONFIG_TPM_AUTH_SESSIONS */
#define MAKE_TPM_CMD_ENTRY(cmd) \
U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
static cmd_tbl_t tpm_commands[] = {
U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
U_BOOT_CMD_MKENT(init, 0, 1,
do_tpm_init, "", ""),
U_BOOT_CMD_MKENT(startup, 0, 1,
do_tpm_startup, "", ""),
U_BOOT_CMD_MKENT(self_test_full, 0, 1,
do_tpm_self_test_full, "", ""),
U_BOOT_CMD_MKENT(continue_self_test, 0, 1,
do_tpm_continue_self_test, "", ""),
U_BOOT_CMD_MKENT(force_clear, 0, 1,
do_tpm_force_clear, "", ""),
U_BOOT_CMD_MKENT(physical_enable, 0, 1,
do_tpm_physical_enable, "", ""),
U_BOOT_CMD_MKENT(physical_disable, 0, 1,
do_tpm_physical_disable, "", ""),
U_BOOT_CMD_MKENT(nv_define_space, 0, 1,
do_tpm_nv_define_space, "", ""),
U_BOOT_CMD_MKENT(nv_read_value, 0, 1,
do_tpm_nv_read_value, "", ""),
U_BOOT_CMD_MKENT(nv_write_value, 0, 1,
do_tpm_nv_write_value, "", ""),
U_BOOT_CMD_MKENT(extend, 0, 1,
do_tpm_extend, "", ""),
U_BOOT_CMD_MKENT(pcr_read, 0, 1,
do_tpm_pcr_read, "", ""),
U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1,
do_tpm_tsc_physical_presence, "", ""),
U_BOOT_CMD_MKENT(read_pubek, 0, 1,
do_tpm_read_pubek, "", ""),
U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1,
do_tpm_physical_set_deactivated, "", ""),
U_BOOT_CMD_MKENT(get_capability, 0, 1,
do_tpm_get_capability, "", ""),
U_BOOT_CMD_MKENT(raw_transfer, 0, 1,
do_tpm_raw_transfer, "", ""),
U_BOOT_CMD_MKENT(nv_define, 0, 1,
do_tpm_nv_define, "", ""),
U_BOOT_CMD_MKENT(nv_read, 0, 1,
do_tpm_nv_read, "", ""),
U_BOOT_CMD_MKENT(nv_write, 0, 1,
do_tpm_nv_write, "", ""),
#ifdef CONFIG_TPM_AUTH_SESSIONS
U_BOOT_CMD_MKENT(oiap, 0, 1,
do_tpm_oiap, "", ""),
U_BOOT_CMD_MKENT(end_oiap, 0, 1,
do_tpm_end_oiap, "", ""),
U_BOOT_CMD_MKENT(load_key2_oiap, 0, 1,
do_tpm_load_key2_oiap, "", ""),
U_BOOT_CMD_MKENT(get_pub_key_oiap, 0, 1,
do_tpm_get_pub_key_oiap, "", ""),
#endif /* CONFIG_TPM_AUTH_SESSIONS */
};
static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
cmd_tbl_t *tpm_cmd;
if (argc < 2)
return CMD_RET_USAGE;
tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands));
if (!tpm_cmd)
return CMD_RET_USAGE;
return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
}
U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
"Issue a TPM command",
"cmd args...\n"
" - Issue TPM command <cmd> with arguments <args...>.\n"
"Admin Startup and State Commands:\n"
" info - Show information about the TPM\n"
" init\n"
" - Put TPM into a state where it waits for 'startup' command.\n"
" startup mode\n"
" - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR,\n"
" TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
"Admin Testing Commands:\n"
" self_test_full\n"
" - Test all of the TPM capabilities.\n"
" continue_self_test\n"
" - Inform TPM that it should complete the self-test.\n"
"Admin Opt-in Commands:\n"
" physical_enable\n"
" - Set the PERMANENT disable flag to FALSE using physical presence as\n"
" authorization.\n"
" physical_disable\n"
" - Set the PERMANENT disable flag to TRUE using physical presence as\n"
" authorization.\n"
" physical_set_deactivated 0|1\n"
" - Set deactivated flag.\n"
"Admin Ownership Commands:\n"
" force_clear\n"
" - Issue TPM_ForceClear command.\n"
" tsc_physical_presence flags\n"
" - Set TPM device's Physical Presence flags to <flags>.\n"
"The Capability Commands:\n"
" get_capability cap_area sub_cap addr count\n"
" - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
" <sub_cap> to memory address <addr>.\n"
#ifdef CONFIG_TPM_AUTH_SESSIONS
"Storage functions\n"
" loadkey2_oiap parent_handle key_addr key_len usage_auth\n"
" - loads a key data from memory address <key_addr>, <key_len> bytes\n"
" into TPM using the parent key <parent_handle> with authorization\n"
" <usage_auth> (20 bytes hex string).\n"
" get_pub_key_oiap key_handle usage_auth\n"
" - get the public key portion of a loaded key <key_handle> using\n"
" authorization <usage auth> (20 bytes hex string)\n"
#endif /* CONFIG_TPM_AUTH_SESSIONS */
"Endorsement Key Handling Commands:\n"
" read_pubek addr count\n"
" - Read <count> bytes of the public endorsement key to memory\n"
" address <addr>\n"
"Integrity Collection and Reporting Commands:\n"
" extend index digest_hex_string\n"
" - Add a new measurement to a PCR. Update PCR <index> with the 20-bytes\n"
" <digest_hex_string>\n"
" pcr_read index addr count\n"
" - Read <count> bytes from PCR <index> to memory address <addr>.\n"
#ifdef CONFIG_TPM_AUTH_SESSIONS
"Authorization Sessions\n"
" oiap\n"
" - setup an OIAP session\n"
" end_oiap\n"
" - terminates an active OIAP session\n"
#endif /* CONFIG_TPM_AUTH_SESSIONS */
"Non-volatile Storage Commands:\n"
" nv_define_space index permission size\n"
" - Establish a space at index <index> with <permission> of <size> bytes.\n"
" nv_read_value index addr count\n"
" - Read <count> bytes from space <index> to memory address <addr>.\n"
" nv_write_value index addr count\n"
" - Write <count> bytes from memory address <addr> to space <index>.\n"
"Miscellaneous helper functions:\n"
" raw_transfer byte_string\n"
" - Send a byte string <byte_string> to TPM and print the response.\n"
" Non-volatile storage helper functions:\n"
" These helper functions treat a non-volatile space as a non-padded\n"
" sequence of integer values. These integer values are defined by a type\n"
" string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n"
" value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take\n"
" a type string as their first argument.\n"
" nv_define type_string index perm\n"
" - Define a space <index> with permission <perm>.\n"
" nv_read types_string index vars...\n"
" - Read from space <index> to environment variables <vars...>.\n"
" nv_write types_string index values...\n"
" - Write to space <index> from values <values...>.\n"
);