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u-boot/cmd/tpm-v2.c
Ilias Apalodimas e663b2ff4b tpm: Add 'tpm autostart' shell command 
For a TPM device to be operational we need to initialize it and
perform its startup sequence.  The 'tpm init' command currently calls
tpm_init() which ends up calling the ->open() per-device callback and
performs the initial hardware configuration as well as requesting
locality 0 for the caller.  There no code that currently calls
tpm_init() without following up with a tpm_startup() and tpm_self_test_full()
or tpm_continue_self_test().

So let's add a 'tpm autostart' command and call tpm_auto_start() which
leaves the device in an operational state.

It's worth noting that calling tpm_init() only, doesn't allow a someone
to use the TPM since the startup sequence is mandatory. We always
repeat the pattern of calling
- tpm_init()
- tpm_startup()
- tpm_self_test_full() or tpm_continue_self_test()

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
2023-06-13 08:51:07 +03:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Bootlin
* Author: Miquel Raynal <miquel.raynal@bootlin.com>
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <mapmem.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include "tpm-user-utils.h"
static int do_tpm2_startup(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
enum tpm2_startup_types mode;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc != 2)
return CMD_RET_USAGE;
if (!strcasecmp("TPM2_SU_CLEAR", argv[1])) {
mode = TPM2_SU_CLEAR;
} else if (!strcasecmp("TPM2_SU_STATE", argv[1])) {
mode = TPM2_SU_STATE;
} else {
printf("Couldn't recognize mode string: %s\n", argv[1]);
return CMD_RET_FAILURE;
}
return report_return_code(tpm2_startup(dev, mode));
}
static int do_tpm2_self_test(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
enum tpm2_yes_no full_test;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc != 2)
return CMD_RET_USAGE;
if (!strcasecmp("full", argv[1])) {
full_test = TPMI_YES;
} else if (!strcasecmp("continue", argv[1])) {
full_test = TPMI_NO;
} else {
printf("Couldn't recognize test mode: %s\n", argv[1]);
return CMD_RET_FAILURE;
}
return report_return_code(tpm2_self_test(dev, full_test));
}
static int do_tpm2_clear(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u32 handle = 0;
const char *pw = (argc < 3) ? NULL : argv[2];
const ssize_t pw_sz = pw ? strlen(pw) : 0;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc < 2 || argc > 3)
return CMD_RET_USAGE;
if (pw_sz > TPM2_DIGEST_LEN)
return -EINVAL;
if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1]))
handle = TPM2_RH_LOCKOUT;
else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1]))
handle = TPM2_RH_PLATFORM;
else
return CMD_RET_USAGE;
return report_return_code(tpm2_clear(dev, handle, pw, pw_sz));
}
static int do_tpm2_pcr_extend(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
struct udevice *dev;
struct tpm_chip_priv *priv;
u32 index = simple_strtoul(argv[1], NULL, 0);
void *digest = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0);
int ret;
u32 rc;
if (argc != 3)
return CMD_RET_USAGE;
ret = get_tpm(&dev);
if (ret)
return ret;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -EINVAL;
if (index >= priv->pcr_count)
return -EINVAL;
rc = tpm2_pcr_extend(dev, index, TPM2_ALG_SHA256, digest,
TPM2_DIGEST_LEN);
unmap_sysmem(digest);
return report_return_code(rc);
}
static int do_tpm_pcr_read(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
struct udevice *dev;
struct tpm_chip_priv *priv;
u32 index, rc;
unsigned int updates;
void *data;
int ret;
if (argc != 3)
return CMD_RET_USAGE;
ret = get_tpm(&dev);
if (ret)
return ret;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -EINVAL;
index = simple_strtoul(argv[1], NULL, 0);
if (index >= priv->pcr_count)
return -EINVAL;
data = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0);
rc = tpm2_pcr_read(dev, index, priv->pcr_select_min, TPM2_ALG_SHA256,
data, TPM2_DIGEST_LEN, &updates);
if (!rc) {
printf("PCR #%u content (%u known updates):\n", index, updates);
print_byte_string(data, TPM2_DIGEST_LEN);
}
unmap_sysmem(data);
return report_return_code(rc);
}
static int do_tpm_get_capability(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u32 capability, property, rc;
u8 *data;
size_t count;
int i, j;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc != 5)
return CMD_RET_USAGE;
capability = simple_strtoul(argv[1], NULL, 0);
property = simple_strtoul(argv[2], NULL, 0);
data = map_sysmem(simple_strtoul(argv[3], NULL, 0), 0);
count = simple_strtoul(argv[4], NULL, 0);
rc = tpm2_get_capability(dev, capability, property, data, count);
if (rc)
goto unmap_data;
printf("Capabilities read from TPM:\n");
for (i = 0; i < count; i++) {
printf("Property 0x");
for (j = 0; j < 4; j++)
printf("%02x", data[(i * 8) + j + sizeof(u32)]);
printf(": 0x");
for (j = 4; j < 8; j++)
printf("%02x", data[(i * 8) + j + sizeof(u32)]);
printf("\n");
}
unmap_data:
unmap_sysmem(data);
return report_return_code(rc);
}
static int do_tpm_dam_reset(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
const char *pw = (argc < 2) ? NULL : argv[1];
const ssize_t pw_sz = pw ? strlen(pw) : 0;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc > 2)
return CMD_RET_USAGE;
if (pw_sz > TPM2_DIGEST_LEN)
return -EINVAL;
return report_return_code(tpm2_dam_reset(dev, pw, pw_sz));
}
static int do_tpm_dam_parameters(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
const char *pw = (argc < 5) ? NULL : argv[4];
const ssize_t pw_sz = pw ? strlen(pw) : 0;
/*
* No Dictionary Attack Mitigation (DAM) means:
* maxtries = 0xFFFFFFFF, recovery_time = 1, lockout_recovery = 0
*/
unsigned long int max_tries;
unsigned long int recovery_time;
unsigned long int lockout_recovery;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc < 4 || argc > 5)
return CMD_RET_USAGE;
if (pw_sz > TPM2_DIGEST_LEN)
return -EINVAL;
if (strict_strtoul(argv[1], 0, &max_tries))
return CMD_RET_USAGE;
if (strict_strtoul(argv[2], 0, &recovery_time))
return CMD_RET_USAGE;
if (strict_strtoul(argv[3], 0, &lockout_recovery))
return CMD_RET_USAGE;
log(LOGC_NONE, LOGL_INFO, "Changing dictionary attack parameters:\n");
log(LOGC_NONE, LOGL_INFO, "- maxTries: %lu", max_tries);
log(LOGC_NONE, LOGL_INFO, "- recoveryTime: %lu\n", recovery_time);
log(LOGC_NONE, LOGL_INFO, "- lockoutRecovery: %lu\n", lockout_recovery);
return report_return_code(tpm2_dam_parameters(dev, pw, pw_sz, max_tries,
recovery_time,
lockout_recovery));
}
static int do_tpm_change_auth(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u32 handle;
const char *newpw = argv[2];
const char *oldpw = (argc == 3) ? NULL : argv[3];
const ssize_t newpw_sz = strlen(newpw);
const ssize_t oldpw_sz = oldpw ? strlen(oldpw) : 0;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc < 3 || argc > 4)
return CMD_RET_USAGE;
if (newpw_sz > TPM2_DIGEST_LEN || oldpw_sz > TPM2_DIGEST_LEN)
return -EINVAL;
if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1]))
handle = TPM2_RH_LOCKOUT;
else if (!strcasecmp("TPM2_RH_ENDORSEMENT", argv[1]))
handle = TPM2_RH_ENDORSEMENT;
else if (!strcasecmp("TPM2_RH_OWNER", argv[1]))
handle = TPM2_RH_OWNER;
else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1]))
handle = TPM2_RH_PLATFORM;
else
return CMD_RET_USAGE;
return report_return_code(tpm2_change_auth(dev, handle, newpw, newpw_sz,
oldpw, oldpw_sz));
}
static int do_tpm_pcr_setauthpolicy(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u32 index = simple_strtoul(argv[1], NULL, 0);
char *key = argv[2];
const char *pw = (argc < 4) ? NULL : argv[3];
const ssize_t pw_sz = pw ? strlen(pw) : 0;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (strlen(key) != TPM2_DIGEST_LEN)
return -EINVAL;
if (argc < 3 || argc > 4)
return CMD_RET_USAGE;
return report_return_code(tpm2_pcr_setauthpolicy(dev, pw, pw_sz, index,
key));
}
static int do_tpm_pcr_setauthvalue(struct cmd_tbl *cmdtp, int flag,
int argc, char *const argv[])
{
u32 index = simple_strtoul(argv[1], NULL, 0);
char *key = argv[2];
const ssize_t key_sz = strlen(key);
const char *pw = (argc < 4) ? NULL : argv[3];
const ssize_t pw_sz = pw ? strlen(pw) : 0;
struct udevice *dev;
int ret;
ret = get_tpm(&dev);
if (ret)
return ret;
if (strlen(key) != TPM2_DIGEST_LEN)
return -EINVAL;
if (argc < 3 || argc > 4)
return CMD_RET_USAGE;
return report_return_code(tpm2_pcr_setauthvalue(dev, pw, pw_sz, index,
key, key_sz));
}
static struct cmd_tbl tpm2_commands[] = {
U_BOOT_CMD_MKENT(device, 0, 1, do_tpm_device, "", ""),
U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
U_BOOT_CMD_MKENT(state, 0, 1, do_tpm_report_state, "", ""),
U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""),
U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""),
U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""),
U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""),
U_BOOT_CMD_MKENT(pcr_extend, 0, 1, do_tpm2_pcr_extend, "", ""),
U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""),
U_BOOT_CMD_MKENT(get_capability, 0, 1, do_tpm_get_capability, "", ""),
U_BOOT_CMD_MKENT(dam_reset, 0, 1, do_tpm_dam_reset, "", ""),
U_BOOT_CMD_MKENT(dam_parameters, 0, 1, do_tpm_dam_parameters, "", ""),
U_BOOT_CMD_MKENT(change_auth, 0, 1, do_tpm_change_auth, "", ""),
U_BOOT_CMD_MKENT(autostart, 0, 1, do_tpm_autostart, "", ""),
U_BOOT_CMD_MKENT(pcr_setauthpolicy, 0, 1,
do_tpm_pcr_setauthpolicy, "", ""),
U_BOOT_CMD_MKENT(pcr_setauthvalue, 0, 1,
do_tpm_pcr_setauthvalue, "", ""),
};
struct cmd_tbl *get_tpm2_commands(unsigned int *size)
{
*size = ARRAY_SIZE(tpm2_commands);
return tpm2_commands;
}
U_BOOT_CMD(tpm2, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
"<command> [<arguments>]\n"
"\n"
"device [num device]\n"
" Show all devices or set the specified device\n"
"info\n"
" Show information about the TPM.\n"
"state\n"
" Show internal state from the TPM (if available)\n"
"autostart\n"
" Initalize the tpm, perform a Startup(clear) and run a full selftest\n"
" sequence\n"
"init\n"
" Initialize the software stack. Always the first command to issue.\n"
" 'tpm startup' is the only acceptable command after a 'tpm init' has been\n"
" issued\n"
"startup <mode>\n"
" Issue a TPM2_Startup command.\n"
" <mode> is one of:\n"
" * TPM2_SU_CLEAR (reset state)\n"
" * TPM2_SU_STATE (preserved state)\n"
"self_test <type>\n"
" Test the TPM capabilities.\n"
" <type> is one of:\n"
" * full (perform all tests)\n"
" * continue (only check untested tests)\n"
"clear <hierarchy>\n"
" Issue a TPM2_Clear command.\n"
" <hierarchy> is one of:\n"
" * TPM2_RH_LOCKOUT\n"
" * TPM2_RH_PLATFORM\n"
"pcr_extend <pcr> <digest_addr>\n"
" Extend PCR #<pcr> with digest at <digest_addr>.\n"
" <pcr>: index of the PCR\n"
" <digest_addr>: address of a 32-byte SHA256 digest\n"
"pcr_read <pcr> <digest_addr>\n"
" Read PCR #<pcr> to memory address <digest_addr>.\n"
" <pcr>: index of the PCR\n"
" <digest_addr>: address to store the a 32-byte SHA256 digest\n"
"get_capability <capability> <property> <addr> <count>\n"
" Read and display <count> entries indexed by <capability>/<property>.\n"
" Values are 4 bytes long and are written at <addr>.\n"
" <capability>: capability\n"
" <property>: property\n"
" <addr>: address to store <count> entries of 4 bytes\n"
" <count>: number of entries to retrieve\n"
"dam_reset [<password>]\n"
" If the TPM is not in a LOCKOUT state, reset the internal error counter.\n"
" <password>: optional password\n"
"dam_parameters <max_tries> <recovery_time> <lockout_recovery> [<password>]\n"
" If the TPM is not in a LOCKOUT state, set the DAM parameters\n"
" <maxTries>: maximum number of failures before lockout,\n"
" 0 means always locking\n"
" <recoveryTime>: time before decrement of the error counter,\n"
" 0 means no lockout\n"
" <lockoutRecovery>: time of a lockout (before the next try),\n"
" 0 means a reboot is needed\n"
" <password>: optional password of the LOCKOUT hierarchy\n"
"change_auth <hierarchy> <new_pw> [<old_pw>]\n"
" <hierarchy>: the hierarchy\n"
" <new_pw>: new password for <hierarchy>\n"
" <old_pw>: optional previous password of <hierarchy>\n"
"pcr_setauthpolicy|pcr_setauthvalue <pcr> <key> [<password>]\n"
" Change the <key> to access PCR #<pcr>.\n"
" hierarchy and may be empty.\n"
" /!\\WARNING: untested function, use at your own risks !\n"
" <pcr>: index of the PCR\n"
" <key>: secret to protect the access of PCR #<pcr>\n"
" <password>: optional password of the PLATFORM hierarchy\n"
);
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