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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "builtin/endian.h"
#include "console.h"
#include "dcrypto.h"
#include "ec_commands.h"
#include "extension.h"
#include "fips.h"
#include "fips_rand.h"
#include "flash_log.h"
#include "hooks.h"
#include "new_nvmem.h"
#include "nvmem.h"
#include "nvmem_vars.h"
#include "registers.h"
#include "scratch_reg1.h"
#include "shared_mem.h"
#include "system.h"
#include "task.h"
#include "tpm_nvmem_ops.h"
#include "u2f_impl.h"
/**
* Create IRQ handler calling FIPS module's dcrypto_done_interrupt() on
* interrupt. Generated code calls some of the EC OS task management
* functions which are not security/crypto related, so to avoid rewriting
* macro using FIPS vtable, move it outside FIPS module.
*/
DECLARE_IRQ(GC_IRQNUM_CRYPTO0_HOST_CMD_DONE_INT, dcrypto_done_interrupt, 1);
#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ##args)
/* Print on console current FIPS mode. */
static void fips_print_mode(void)
{
enum fips_status status = fips_status();
if (status == FIPS_UNINITIALIZED)
CPRINTS("FIPS mode not initialized");
else if (status & FIPS_ERROR_MASK)
CPRINTS("FIPS error code 0x%08x, not-approved", status);
else
CPRINTS("Running in FIPS 140-2 %s mode",
((status & FIPS_MODE_ACTIVE) &&
(status & FIPS_POWER_UP_TEST_DONE)) ?
"approved" :
"not-approved");
}
/* Print time it took tests to run or print error message. */
static void fips_print_test_time(void)
{
if (fips_last_kat_test_duration != -1ULL)
CPRINTS("FIPS power-up tests completed in %llu",
fips_last_kat_test_duration);
}
static void fips_print_status(void)
{
/* Once FIPS power-up tests completed we can enable console output. */
console_enable_output();
fips_print_test_time();
fips_print_mode();
}
DECLARE_HOOK(HOOK_INIT, fips_print_status, HOOK_PRIO_INIT_PRINT_FIPS_STATUS);
#ifdef CRYPTO_TEST_SETUP
static const uint8_t k_salt = NVMEM_VAR_G2F_SALT;
/* Can't include TPM2 headers, so just define constant locally. */
#define HR_NV_INDEX (1U << 24)
/* Wipe old U2F keys. */
static void u2f_zeroize_non_fips(void)
{
const uint32_t u2fobjs[] = { TPM_HIDDEN_U2F_KEK | HR_NV_INDEX,
TPM_HIDDEN_U2F_KH_SALT | HR_NV_INDEX, 0 };
/* Delete NVMEM_VAR_G2F_SALT. */
setvar(&k_salt, sizeof(k_salt), NULL, 0);
/* Remove U2F keys and wipe all deleted objects. */
nvmem_erase_tpm_data_selective(u2fobjs);
}
/* Set U2F keys to old or new version. */
static void fips_set_u2f_keys(bool active)
{
if (!active) {
/* Old version. */
uint8_t random[32];
/* Create fake u2f keys old style */
fips_trng_bytes(random, sizeof(random));
setvar(&k_salt, sizeof(k_salt), random, sizeof(random));
fips_trng_bytes(random, sizeof(random));
write_tpm_nvmem_hidden(TPM_HIDDEN_U2F_KEK, sizeof(random),
random, 1);
fips_trng_bytes(random, sizeof(random));
write_tpm_nvmem_hidden(TPM_HIDDEN_U2F_KH_SALT, sizeof(random),
random, 1);
} else {
/**
* TODO(sukhomlinov): Implement new key generation after merging
* https://crrev.com/c/3034852 and adding FIPS key gen.
*/
u2f_zeroize_non_fips();
}
system_reset(EC_RESET_FLAG_SECURITY);
}
#endif
/* Console command 'fips' to report and change status, run tests */
static int cmd_fips_status(int argc, char **argv)
{
fips_print_mode();
fips_print_test_time();
CPRINTS("FIPS crypto allowed: %u", fips_crypto_allowed());
cflush();
if (argc == 2) {
if (!strncmp(argv[1], "test", 4)) {
fips_power_up_tests();
fips_print_test_time();
fips_print_mode();
}
#ifdef CRYPTO_TEST_SETUP
else if (!strncmp(argv[1], "new", 3))
fips_set_u2f_keys(true); /* we can reboot here... */
else if (!strncmp(argv[1], "old", 3))
fips_set_u2f_keys(false); /* we can reboot here... */
else if (!strncmp(argv[1], "trng", 4))
fips_break_cmd = FIPS_BREAK_TRNG;
else if (!strncmp(argv[1], "sha", 3))
fips_break_cmd = FIPS_BREAK_SHA256;
#endif
}
return 0;
}
DECLARE_SAFE_CONSOLE_COMMAND(
fips, cmd_fips_status,
#ifdef CRYPTO_TEST_SETUP
"[test | new | old | trng | sha]",
"Report FIPS status, switch U2F key, run tests, simulate errors");
#else
"[test]", "Report FIPS status, run tests");
#endif
/**
* Vendor command implementation to report & change status, run tests.
* Command structure:
*
* field | size | note
* =========================================================================
* op | 1 | 0 - get status, 1 - set FIPS ON (remove old U2F)
* | | 2 - run tests, 3 .. 8 - simulate errors
*/
static enum vendor_cmd_rc fips_cmd(enum vendor_cmd_cc code, void *buf,
size_t input_size, size_t *response_size)
{
uint8_t *cmd = buf;
uint32_t fips_reverse;
*response_size = 0;
if (input_size != 1)
return VENDOR_RC_BOGUS_ARGS;
switch ((enum fips_cmd) *cmd) {
case FIPS_CMD_GET_STATUS:
fips_reverse = htobe32(fips_status());
memcpy(buf, &fips_reverse, sizeof(fips_reverse));
*response_size = sizeof(fips_reverse);
break;
case FIPS_CMD_TEST:
fips_power_up_tests();
fips_reverse = htobe32(fips_status());
memcpy(buf, &fips_reverse, sizeof(fips_reverse));
*response_size = sizeof(fips_reverse);
break;
#ifdef CRYPTO_TEST_SETUP
case FIPS_CMD_ON:
fips_set_u2f_keys(true); /* we can reboot here... */
break;
case FIPS_CMD_BREAK_TRNG:
fips_break_cmd = FIPS_BREAK_TRNG;
break;
case FIPS_CMD_BREAK_SHA256:
fips_break_cmd = FIPS_BREAK_SHA256;
break;
case FIPS_CMD_BREAK_HMAC_SHA256:
fips_break_cmd = FIPS_BREAK_HMAC_SHA256;
break;
case FIPS_CMD_BREAK_HMAC_DRBG:
fips_break_cmd = FIPS_BREAK_HMAC_DRBG;
break;
case FIPS_CMD_BREAK_ECDSA:
fips_break_cmd = FIPS_BREAK_ECDSA;
break;
#ifdef CONFIG_FIPS_AES_CBC_256
case FIPS_CMD_BREAK_AES256:
fips_break_cmd = FIPS_BREAK_AES256;
break;
#endif /* CONFIG_FIPS_AES_CBC_256 */
#ifdef CONFIG_FIPS_RSA2048
case FIPS_CMD_BREAK_RSA2048:
fips_break_cmd = FIPS_BREAK_RSA2048;
break;
#endif /* CONFIG_FIPS_RSA2048 */
case FIPS_CMD_NO_BREAK:
fips_break_cmd = FIPS_NO_BREAK;
break;
#endif /* CRYPTO_TEST_SETUP */
default:
return VENDOR_RC_BOGUS_ARGS;
}
return VENDOR_RC_SUCCESS;
}
DECLARE_VENDOR_COMMAND(VENDOR_CC_FIPS_CMD, fips_cmd);
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