/* Copyright (c) 2013 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.
 *
 * Tests for firmware image library.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cryptolib.h"
#include "file_keys.h"
#include "host_common.h"
#include "test_common.h"
#include "vboot_common.h"


static void ReChecksumKeyBlock(VbKeyBlockHeader *h) {
  uint8_t* newchk = DigestBuf((const uint8_t*)h,
                              h->key_block_checksum.data_size,
                              SHA512_DIGEST_ALGORITHM);
  Memcpy(GetSignatureData(&h->key_block_checksum), newchk, SHA512_DIGEST_SIZE);
  free(newchk);
}


static void KeyBlockVerifyTest(const VbPublicKey* public_key,
                               const VbPrivateKey* private_key,
                               const VbPublicKey* data_key) {

  VbKeyBlockHeader *hdr;
  VbKeyBlockHeader *h;
  unsigned hsize;

  hdr = KeyBlockCreate(data_key, private_key, 0x1234);
  TEST_NEQ((size_t)hdr, 0, "KeyBlockVerify() prerequisites");
  if (!hdr)
    return;
  hsize = (unsigned) hdr->key_block_size;
  h = (VbKeyBlockHeader*)malloc(hsize + 1024);

  TEST_EQ(KeyBlockVerify(hdr, hsize, NULL, 1), 0,
          "KeyBlockVerify() ok using checksum");
  TEST_EQ(KeyBlockVerify(hdr, hsize, public_key, 0), 0,
          "KeyBlockVerify() ok using key");
  TEST_NEQ(KeyBlockVerify(hdr, hsize, NULL, 0), 0,
           "KeyBlockVerify() missing key");

  TEST_NEQ(KeyBlockVerify(hdr, hsize - 1, NULL, 1), 0,
           "KeyBlockVerify() size--");
  TEST_EQ(KeyBlockVerify(hdr, hsize + 1, NULL, 1), 0,
          "KeyBlockVerify() size++");

  Memcpy(h, hdr, hsize);
  h->magic[0] &= 0x12;
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0, "KeyBlockVerify() magic");

  /* Care about major version but not minor */
  Memcpy(h, hdr, hsize);
  h->header_version_major++;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0, "KeyBlockVerify() major++");

  Memcpy(h, hdr, hsize);
  h->header_version_major--;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0, "KeyBlockVerify() major--");

  Memcpy(h, hdr, hsize);
  h->header_version_minor++;
  ReChecksumKeyBlock(h);
  TEST_EQ(KeyBlockVerify(h, hsize, NULL, 1), 0, "KeyBlockVerify() minor++");

  Memcpy(h, hdr, hsize);
  h->header_version_minor--;
  ReChecksumKeyBlock(h);
  TEST_EQ(KeyBlockVerify(h, hsize, NULL, 1), 0, "KeyBlockVerify() minor--");

  /* Check hash */
  Memcpy(h, hdr, hsize);
  h->key_block_checksum.sig_offset = hsize;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
           "KeyBlockVerify() checksum off end");

  Memcpy(h, hdr, hsize);
  h->key_block_checksum.sig_size /= 2;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
           "KeyBlockVerify() checksum too small");

  Memcpy(h, hdr, hsize);
  GetPublicKeyData(&h->data_key)[0] ^= 0x34;
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
           "KeyBlockVerify() checksum mismatch");

  /* Check signature */
  Memcpy(h, hdr, hsize);
  h->key_block_signature.sig_offset = hsize;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
           "KeyBlockVerify() sig off end");

  Memcpy(h, hdr, hsize);
  h->key_block_signature.sig_size--;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
           "KeyBlockVerify() sig too small");

  Memcpy(h, hdr, hsize);
  GetPublicKeyData(&h->data_key)[0] ^= 0x34;
  TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
           "KeyBlockVerify() sig mismatch");

  Memcpy(h, hdr, hsize);
  //ReChecksumKeyBlock(h);
  h->key_block_checksum.data_size = h->key_block_size + 1;
  TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 1), 0,
           "KeyBlockVerify() checksum data past end of block");

  /* Check that we signed header and data key */
  Memcpy(h, hdr, hsize);
  h->key_block_checksum.data_size = 4;
  h->data_key.key_offset = 0;
  h->data_key.key_size = 0;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
           "KeyBlockVerify() didn't sign header");

  Memcpy(h, hdr, hsize);
  h->data_key.key_offset = hsize;
  ReChecksumKeyBlock(h);
  TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
           "KeyBlockVerify() data key off end");

  /* Corner cases for error checking */
  TEST_NEQ(KeyBlockVerify(NULL, 4, NULL, 1), 0,
	  "KeyBlockVerify size too small");

  /* TODO: verify parser can support a bigger header (i.e., one where
   * data_key.key_offset is bigger than expected). */

  free(h);
  free(hdr);
}


static void ReSignFirmwarePreamble(VbFirmwarePreambleHeader* h,
                                   const VbPrivateKey* key) {
  VbSignature *sig = CalculateSignature((const uint8_t*)h,
                                        h->preamble_signature.data_size, key);

  SignatureCopy(&h->preamble_signature, sig);
  free(sig);
}


static void VerifyFirmwarePreambleTest(const VbPublicKey* public_key,
                                       const VbPrivateKey* private_key,
                                       const VbPublicKey* kernel_subkey) {

  VbFirmwarePreambleHeader* hdr;
  VbFirmwarePreambleHeader* h;
  RSAPublicKey* rsa;
  unsigned hsize;

  /* Create a dummy signature */
  VbSignature* body_sig = SignatureAlloc(56, 78);

  rsa = PublicKeyToRSA(public_key);
  hdr = CreateFirmwarePreamble(0x1234, kernel_subkey, body_sig, private_key,
                               0x5678);
  TEST_NEQ(hdr && rsa, 0, "VerifyFirmwarePreamble() prerequisites");
  if (!hdr)
    return;
  hsize = (unsigned) hdr->preamble_size;
  h = (VbFirmwarePreambleHeader*)malloc(hsize + 16384);

  TEST_EQ(VerifyFirmwarePreamble(hdr, hsize, rsa), 0,
          "VerifyFirmwarePreamble() ok using key");
  TEST_NEQ(VerifyFirmwarePreamble(hdr, 4, rsa), 0,
           "VerifyFirmwarePreamble() size tiny");
  TEST_NEQ(VerifyFirmwarePreamble(hdr, hsize - 1, rsa), 0,
           "VerifyFirmwarePreamble() size--");
  TEST_EQ(VerifyFirmwarePreamble(hdr, hsize + 1, rsa), 0,
           "VerifyFirmwarePreamble() size++");

  /* Care about major version but not minor */
  Memcpy(h, hdr, hsize);
  h->header_version_major++;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() major++");

  Memcpy(h, hdr, hsize);
  h->header_version_major--;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() major--");

  Memcpy(h, hdr, hsize);
  h->header_version_minor++;
  ReSignFirmwarePreamble(h, private_key);
  TEST_EQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
          "VerifyFirmwarePreamble() minor++");

  Memcpy(h, hdr, hsize);
  h->header_version_minor--;
  ReSignFirmwarePreamble(h, private_key);
  TEST_EQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
          "VerifyFirmwarePreamble() minor--");

  /* Check signature */
  Memcpy(h, hdr, hsize);
  h->preamble_signature.sig_offset = hsize;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() sig off end");

  Memcpy(h, hdr, hsize);
  h->preamble_signature.sig_size--;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() sig too small");

  Memcpy(h, hdr, hsize);
  GetPublicKeyData(&h->kernel_subkey)[0] ^= 0x34;
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() sig mismatch");

  /* Check that we signed header, kernel subkey, and body sig */
  Memcpy(h, hdr, hsize);
  h->preamble_signature.data_size = 4;
  h->kernel_subkey.key_offset = 0;
  h->kernel_subkey.key_size = 0;
  h->body_signature.sig_offset = 0;
  h->body_signature.sig_size = 0;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() didn't sign header");

  Memcpy(h, hdr, hsize);
  h->kernel_subkey.key_offset = hsize;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() kernel subkey off end");

  Memcpy(h, hdr, hsize);
  h->body_signature.sig_offset = hsize;
  ReSignFirmwarePreamble(h, private_key);
  TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
           "VerifyFirmwarePreamble() body sig off end");

  /* Check that we return flags properly for new and old structs */
  Memcpy(h, hdr, hsize);
  TEST_EQ(VbGetFirmwarePreambleFlags(h), 0x5678,
          "VbGetFirmwarePreambleFlags() v2.1");
  h->header_version_minor = 0;
  TEST_EQ(VbGetFirmwarePreambleFlags(h), 0,
          "VbGetFirmwarePreambleFlags() v2.0");

  /* TODO: verify with extra padding at end of header. */

  free(h);
  RSAPublicKeyFree(rsa);
  free(hdr);
}

int test_permutation(int signing_key_algorithm, int data_key_algorithm,
		     const char *keys_dir)
{
	char filename[1024];
	int signing_rsa_len = siglen_map[signing_key_algorithm] * 8;;
	int data_rsa_len = siglen_map[data_key_algorithm] * 8;;

	VbPrivateKey* signing_private_key = NULL;
	VbPublicKey* signing_public_key = NULL;
	VbPublicKey* data_public_key = NULL;

	printf("***Testing signing algorithm: %s\n",
	       algo_strings[signing_key_algorithm]);
	printf("***With data key algorithm: %s\n",
	       algo_strings[data_key_algorithm]);

	sprintf(filename, "%s/key_rsa%d.pem", keys_dir, signing_rsa_len);
	signing_private_key = PrivateKeyReadPem(filename,
						signing_key_algorithm);
	if (!signing_private_key) {
		fprintf(stderr, "Error reading signing_private_key: %s\n",
			filename);
		return 1;
	}

	sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, signing_rsa_len);
	signing_public_key = PublicKeyReadKeyb(filename,
					       signing_key_algorithm, 1);
	if (!signing_public_key) {
		fprintf(stderr, "Error reading signing_public_key: %s\n",
			filename);
		return 1;
	}

	sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, data_rsa_len);
	data_public_key = PublicKeyReadKeyb(filename,
					       data_key_algorithm, 1);
	if (!data_public_key) {
		fprintf(stderr, "Error reading data_public_key: %s\n",
			filename);
		return 1;
	}

	KeyBlockVerifyTest(signing_public_key, signing_private_key,
			   data_public_key);
	VerifyFirmwarePreambleTest(signing_public_key, signing_private_key,
				   data_public_key);

	if (signing_public_key)
		free(signing_public_key);
	if (signing_private_key)
		free(signing_private_key);
	if (data_public_key)
		free(data_public_key);

	return 0;
}

struct test_perm
{
	int signing_algorithm;
	int data_key_algorithm;
};

/*
 * Permutations of signing and data key algorithms in active use:
 * 7 (rsa4096 sha256) - 4 (rsa2048 sha256)
 * 11 (rsa8192 sha512) - 4 (rsa2048 sha256)
 * 11 (rsa8192 sha512) - 7 (rsa4096 sha256)
 */
const struct test_perm test_perms[] = {{7, 4}, {11, 4}, {11, 7}};

int main(int argc, char* argv[])
{
	if (argc == 2) {
		/* Test only the algorithms we use */
		int i;

		for (i = 0; i < ARRAY_SIZE(test_perms); i++) {
			if (test_permutation(test_perms[i].signing_algorithm,
					     test_perms[i].data_key_algorithm,
					     argv[1]))
				return 1;
		}

	} else if (argc == 3 && !strcasecmp(argv[2], "--all")) {
		/* Test all the algorithms */
		int sign_alg, data_alg;

		for (sign_alg = 0; sign_alg < kNumAlgorithms; sign_alg++) {
			for (data_alg = 0; data_alg < kNumAlgorithms;
			     data_alg++) {
				if (test_permutation(sign_alg, data_alg,
						     argv[1]))
					return 1;
			}
		}
	} else {
		fprintf(stderr,	"Usage: %s <keys_dir> [--all]",	argv[0]);
		return -1;
	}

	return gTestSuccess ? 0 : 255;
}