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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "console.h"
#include "flash.h"
#include "printf.h"
#include "sha256.h"
#include "system.h"
#include "test/drivers/test_state.h"
#include "vboot_hash.h"
#include <string.h>
#include <zephyr/fff.h>
#include <zephyr/shell/shell_dummy.h>
#include <zephyr/sys/util.h>
#include <zephyr/ztest.h>
#define CUSTOM_HASH_LENGTH (32)
struct console_cmd_hash_fixture {
uint8_t rw_hash[SHA256_DIGEST_SIZE];
uint8_t ro_hash[SHA256_DIGEST_SIZE];
};
ZTEST_F(console_cmd_hash, get_rw)
{
const char *outbuffer;
size_t buffer_size;
/* Start calculating the RW image hash */
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash rw"), NULL);
/* Wait for completion */
WAIT_FOR(!vboot_hash_in_progress(), 1000000, k_sleep(K_MSEC(10)));
/* Call again with no args to see the resulting hash */
shell_backend_dummy_clear_output(get_ec_shell());
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash"), NULL);
outbuffer =
shell_backend_dummy_get_output(get_ec_shell(), &buffer_size);
/* The RW hash should be reported. */
char hash_buf[hex_str_buf_size(SHA256_DIGEST_SIZE)];
snprintf_hex_buffer(hash_buf, sizeof(hash_buf),
HEX_BUF(fixture->rw_hash, SHA256_DIGEST_SIZE));
zassert_ok(!strstr(outbuffer, hash_buf), "Output was: `%s`", outbuffer);
}
ZTEST_F(console_cmd_hash, get_ro)
{
const char *outbuffer;
size_t buffer_size;
/* Start calculating the RW image hash */
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash ro"), NULL);
/* Wait for completion */
WAIT_FOR(!vboot_hash_in_progress(), 1000000, k_sleep(K_MSEC(10)));
/* Call again with no args to see the resulting hash */
shell_backend_dummy_clear_output(get_ec_shell());
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash"), NULL);
outbuffer =
shell_backend_dummy_get_output(get_ec_shell(), &buffer_size);
/* The RO hash should be reported. */
char hash_buf[hex_str_buf_size(SHA256_DIGEST_SIZE)];
snprintf_hex_buffer(hash_buf, sizeof(hash_buf),
HEX_BUF(fixture->ro_hash, SHA256_DIGEST_SIZE));
zassert_ok(!strstr(outbuffer, hash_buf), "Output was: `%s`", outbuffer);
}
ZTEST_F(console_cmd_hash, abort)
{
const char *outbuffer;
size_t buffer_size;
/* Start calculating the RO image hash */
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash ro"), NULL);
/* Immediately cancel */
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash abort"), NULL);
/* Call again with no args to check status */
shell_backend_dummy_clear_output(get_ec_shell());
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash"), NULL);
outbuffer =
shell_backend_dummy_get_output(get_ec_shell(), &buffer_size);
/* Depending on timing, we should see one of these statuses */
zassert_true(strstr(outbuffer, "(invalid)") ||
strstr(outbuffer, "(aborting)"),
"Output was: `%s`", outbuffer);
}
ZTEST_F(console_cmd_hash, custom_range)
{
char command[256];
uint32_t offset = flash_get_rw_offset(system_get_active_copy());
/* Hash an arbitrary portion of the flash */
snprintf(command, sizeof(command), "hash 0x%x %u", offset,
CUSTOM_HASH_LENGTH);
zassert_ok(shell_execute_cmd(get_ec_shell(), command));
WAIT_FOR(!vboot_hash_in_progress(), 1000000, k_sleep(K_MSEC(10)));
/* Calculate the expected hash */
struct sha256_ctx hash_ctx;
uint8_t *hash;
uint8_t buf[CUSTOM_HASH_LENGTH];
zassert_ok(crec_flash_read(offset, sizeof(buf), buf));
SHA256_init(&hash_ctx);
SHA256_update(&hash_ctx, buf, sizeof(buf));
hash = SHA256_final(&hash_ctx);
/* Call again with no args to check status */
const char *outbuffer;
size_t buffer_size;
shell_backend_dummy_clear_output(get_ec_shell());
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash"));
outbuffer =
shell_backend_dummy_get_output(get_ec_shell(), &buffer_size);
/* Compare hashes */
char hash_buf[hex_str_buf_size(SHA256_DIGEST_SIZE)];
snprintf_hex_buffer(hash_buf, sizeof(hash_buf),
HEX_BUF(hash, SHA256_DIGEST_SIZE));
zassert_ok(!strstr(outbuffer, hash_buf), "Output was: `%s`. Actual: %s",
outbuffer, hash_buf);
}
ZTEST_F(console_cmd_hash, custom_range_with_nonce)
{
char command[256];
uint32_t offset = flash_get_rw_offset(system_get_active_copy());
int nonce = 1234;
/* Hash an arbitrary portion of the flash w/ nonce */
snprintf(command, sizeof(command), "hash 0x%x %u %d", offset,
CUSTOM_HASH_LENGTH, nonce);
zassert_ok(shell_execute_cmd(get_ec_shell(), command));
WAIT_FOR(!vboot_hash_in_progress(), 1000000, k_sleep(K_MSEC(10)));
/* Calculate the expected hash */
struct sha256_ctx hash_ctx;
uint8_t *hash;
uint8_t buf[CUSTOM_HASH_LENGTH];
zassert_ok(crec_flash_read(offset, sizeof(buf), buf));
SHA256_init(&hash_ctx);
SHA256_update(&hash_ctx, (const uint8_t *)&nonce, sizeof(nonce));
SHA256_update(&hash_ctx, buf, sizeof(buf));
hash = SHA256_final(&hash_ctx);
/* Call again with no args to check status */
const char *outbuffer;
size_t buffer_size;
shell_backend_dummy_clear_output(get_ec_shell());
zassert_ok(shell_execute_cmd(get_ec_shell(), "hash"));
outbuffer =
shell_backend_dummy_get_output(get_ec_shell(), &buffer_size);
/* Compare hashes */
char hash_buf[hex_str_buf_size(SHA256_DIGEST_SIZE)];
snprintf_hex_buffer(hash_buf, sizeof(hash_buf),
HEX_BUF(hash, SHA256_DIGEST_SIZE));
zassert_ok(!strstr(outbuffer, hash_buf), "Output was: `%s`. Actual: %s",
outbuffer, hash_buf);
}
ZTEST(console_cmd_hash, invalid)
{
/* Invalid subcommand */
zassert_ok(!shell_execute_cmd(get_ec_shell(), "hash foo"));
/* For custom ranges, non-numbers are invalid */
zassert_ok(!shell_execute_cmd(get_ec_shell(), "hash a b"));
zassert_ok(!shell_execute_cmd(get_ec_shell(), "hash 1 b"));
zassert_ok(!shell_execute_cmd(get_ec_shell(), "hash 1 2 c"));
}
static void *setup(void)
{
static struct console_cmd_hash_fixture f;
return &f;
}
static void before(void *data)
{
struct console_cmd_hash_fixture *f =
(struct console_cmd_hash_fixture *)data;
const uint8_t *hash_ptr;
int rv;
/* Stop and clear current hash */
vboot_hash_abort();
/* Get the RW hash and save it to our fixture */
rv = vboot_get_rw_hash(&hash_ptr);
zassert_ok(rv, "Got %d", rv);
memcpy(f->rw_hash, hash_ptr, sizeof(f->rw_hash));
/* Compute the RO hash, too */
rv = vboot_get_ro_hash(&hash_ptr);
zassert_ok(rv, "Got %d", rv);
memcpy(f->ro_hash, hash_ptr, sizeof(f->ro_hash));
}
static void after(void *data)
{
ARG_UNUSED(data);
/* Stop and clear current hash */
vboot_hash_abort();
/* Wait a moment to allow the hashing to stop */
k_sleep(K_MSEC(100));
}
ZTEST_SUITE(console_cmd_hash, drivers_predicate_post_main, setup, before, after,
NULL);
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