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src/subversion/subversion/libsvn_subr/crypto.c  view on Meta::CPAN

                            _("OpenSSL crypto driver error"));
  if (driver == NULL)
    return svn_error_create(APR_EGENERAL,
                            err_from_apu_err(APR_EGENERAL, apu_err),
                            _("Bad return value while loading crypto "
                              "driver"));

  apr_err = apr_crypto_make(&apr_crypto, driver, NULL, result_pool);
  if (apr_err != APR_SUCCESS || apr_crypto == NULL)
    return svn_error_create(apr_err, NULL,
                            _("Error creating OpenSSL crypto context"));

  /* Allocate and initialize our crypto context. */
  *ctx = apr_palloc(result_pool, sizeof(**ctx));
  (*ctx)->crypto = apr_crypto;

  return SVN_NO_ERROR;
#else /* SVN_HAVE_CRYPTO */
  return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
                          "Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}


svn_error_t *
svn_crypto__encrypt_password(const svn_string_t **ciphertext,
                             const svn_string_t **iv,
                             const svn_string_t **salt,
                             svn_crypto__ctx_t *ctx,
                             const char *password,
                             const svn_string_t *master,
                             apr_pool_t *result_pool,
                             apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
  svn_error_t *err = SVN_NO_ERROR;
  const unsigned char *salt_vector;
  const unsigned char *iv_vector;
  apr_size_t iv_len;
  apr_crypto_key_t *key = NULL;
  apr_status_t apr_err;
  const unsigned char *prefix;
  apr_crypto_block_t *block_ctx = NULL;
  apr_size_t block_size;
  unsigned char *assembled;
  apr_size_t password_len, assembled_len = 0;
  apr_size_t result_len;
  unsigned char *result;
  apr_size_t ignored_result_len = 0;

  SVN_ERR_ASSERT(ctx != NULL);

  /* Generate the salt. */
#define SALT_LEN 8
  SVN_ERR(get_random_bytes(&salt_vector, ctx, SALT_LEN, result_pool));

  /* Initialize the passphrase.  */
  apr_err = apr_crypto_passphrase(&key, &iv_len,
                                  master->data, master->len,
                                  salt_vector, SALT_LEN,
                                  APR_KEY_AES_256, APR_MODE_CBC,
                                  FALSE /* doPad */, NUM_ITERATIONS,
                                  ctx->crypto,
                                  scratch_pool);
  if (apr_err != APR_SUCCESS)
    return svn_error_trace(crypto_error_create(
                               ctx, apr_err,
                               _("Error creating derived key")));
  if (! key)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Error creating derived key"));
  if (iv_len == 0)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Unexpected IV length returned"));

  /* Generate the proper length IV.  */
  SVN_ERR(get_random_bytes(&iv_vector, ctx, iv_len, result_pool));

  /* Initialize block encryption. */
  apr_err = apr_crypto_block_encrypt_init(&block_ctx, &iv_vector, key,
                                          &block_size, scratch_pool);
  if ((apr_err != APR_SUCCESS) || (! block_ctx))
    return svn_error_trace(crypto_error_create(
                             ctx, apr_err,
                             _("Error initializing block encryption")));

  /* Generate a 4-byte prefix. */
  SVN_ERR(get_random_bytes(&prefix, ctx, RANDOM_PREFIX_LEN, scratch_pool));

  /* Combine our prefix, original password, and appropriate padding.
     We won't bother padding if the prefix and password combined
     perfectly align on the block boundary.  If they don't,
     however, we'll drop a NUL byte after the password and pad with
     random stuff after that to the block boundary. */
  password_len = strlen(password);
  assembled_len = RANDOM_PREFIX_LEN + password_len;
  if ((assembled_len % block_size) == 0)
    {
      assembled = apr_palloc(scratch_pool, assembled_len);
      memcpy(assembled, prefix, RANDOM_PREFIX_LEN);
      memcpy(assembled + RANDOM_PREFIX_LEN, password, password_len);
    }
  else
    {
      const unsigned char *padding;
      apr_size_t pad_len = block_size - (assembled_len % block_size) - 1;

      SVN_ERR(get_random_bytes(&padding, ctx, pad_len, scratch_pool));
      assembled_len = assembled_len + 1 + pad_len;
      assembled = apr_palloc(scratch_pool, assembled_len);
      memcpy(assembled, prefix, RANDOM_PREFIX_LEN);
      memcpy(assembled + RANDOM_PREFIX_LEN, password, password_len);
      *(assembled + RANDOM_PREFIX_LEN + password_len) = '\0';
      memcpy(assembled + RANDOM_PREFIX_LEN + password_len + 1,
             padding, pad_len);
    }

  /* Get the length that we need to allocate.  */
  apr_err = apr_crypto_block_encrypt(NULL, &result_len, assembled,
                                     assembled_len, block_ctx);
  if (apr_err != APR_SUCCESS)

src/subversion/subversion/libsvn_subr/crypto.c  view on Meta::CPAN

  /* Encrypt the block. */
  apr_err = apr_crypto_block_encrypt(&result, &result_len, assembled,
                                     assembled_len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error during block encryption"));
      goto cleanup;
    }

  /* Finalize the block encryption. Since we padded everything, this should
     not produce any more encrypted output.  */
  apr_err = apr_crypto_block_encrypt_finish(NULL,
                                            &ignored_result_len,
                                            block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error finalizing block encryption"));
      goto cleanup;
    }

  *ciphertext = wrap_as_string(result, result_len, result_pool);
  *iv = wrap_as_string(iv_vector, iv_len, result_pool);
  *salt = wrap_as_string(salt_vector, SALT_LEN, result_pool);

 cleanup:
  apr_crypto_block_cleanup(block_ctx);
  return err;
#else /* SVN_HAVE_CRYPTO */
  return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
                          "Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}


svn_error_t *
svn_crypto__decrypt_password(const char **plaintext,
                             svn_crypto__ctx_t *ctx,
                             const svn_string_t *ciphertext,
                             const svn_string_t *iv,
                             const svn_string_t *salt,
                             const svn_string_t *master,
                             apr_pool_t *result_pool,
                             apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
  svn_error_t *err = SVN_NO_ERROR;
  apr_status_t apr_err;
  apr_crypto_block_t *block_ctx = NULL;
  apr_size_t block_size, iv_len;
  apr_crypto_key_t *key = NULL;
  unsigned char *result;
  apr_size_t result_len = 0, final_len = 0;

  /* Initialize the passphrase.  */
  apr_err = apr_crypto_passphrase(&key, &iv_len,
                                  master->data, master->len,
                                  (unsigned char *)salt->data, salt->len,
                                  APR_KEY_AES_256, APR_MODE_CBC,
                                  FALSE /* doPad */, NUM_ITERATIONS,
                                  ctx->crypto, scratch_pool);
  if (apr_err != APR_SUCCESS)
    return svn_error_trace(crypto_error_create(
                               ctx, apr_err,
                               _("Error creating derived key")));
  if (! key)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Error creating derived key"));
  if (iv_len == 0)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Unexpected IV length returned"));
  if (iv_len != iv->len)
    return svn_error_create(SVN_ERR_INCORRECT_PARAMS, NULL,
                            _("Provided IV has incorrect length"));

  apr_err = apr_crypto_block_decrypt_init(&block_ctx, &block_size,
                                          (unsigned char *)iv->data,
                                          key, scratch_pool);
  if ((apr_err != APR_SUCCESS) || (! block_ctx))
    return svn_error_trace(crypto_error_create(
                             ctx, apr_err,
                             _("Error initializing block decryption")));

  apr_err = apr_crypto_block_decrypt(NULL, &result_len,
                                     (unsigned char *)ciphertext->data,
                                     ciphertext->len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error fetching result length"));
      goto cleanup;
    }

  result = apr_palloc(scratch_pool, result_len);
  apr_err = apr_crypto_block_decrypt(&result, &result_len,
                                     (unsigned char *)ciphertext->data,
                                     ciphertext->len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error during block decryption"));
      goto cleanup;
    }

  apr_err = apr_crypto_block_decrypt_finish(result + result_len, &final_len,
                                            block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error finalizing block decryption"));
      goto cleanup;
    }

  /* Copy the non-random bits of the resulting plaintext, skipping the
     prefix and ignoring any trailing padding. */
  *plaintext = apr_pstrndup(result_pool,
                            (const char *)(result + RANDOM_PREFIX_LEN),
                            result_len + final_len - RANDOM_PREFIX_LEN);

 cleanup:
  apr_crypto_block_cleanup(block_ctx);
  return err;
#else /* SVN_HAVE_CRYPTO */
  return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
                          "Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}


svn_error_t *
svn_crypto__generate_secret_checktext(const svn_string_t **ciphertext,
                                      const svn_string_t **iv,
                                      const svn_string_t **salt,
                                      const char **checktext,
                                      svn_crypto__ctx_t *ctx,
                                      const svn_string_t *master,
                                      apr_pool_t *result_pool,
                                      apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
  svn_error_t *err = SVN_NO_ERROR;
  const unsigned char *salt_vector;
  const unsigned char *iv_vector;
  const unsigned char *stuff_vector;
  apr_size_t iv_len;
  apr_crypto_key_t *key = NULL;
  apr_status_t apr_err;
  apr_crypto_block_t *block_ctx = NULL;
  apr_size_t block_size;
  apr_size_t result_len;
  unsigned char *result;
  apr_size_t ignored_result_len = 0;
  apr_size_t stuff_len;
  svn_checksum_t *stuff_sum;

  SVN_ERR_ASSERT(ctx != NULL);

  /* Generate the salt. */
  SVN_ERR(get_random_bytes(&salt_vector, ctx, SALT_LEN, result_pool));

  /* Initialize the passphrase.  */
  apr_err = apr_crypto_passphrase(&key, &iv_len,
                                  master->data, master->len,
                                  salt_vector, SALT_LEN,
                                  APR_KEY_AES_256, APR_MODE_CBC,
                                  FALSE /* doPad */, NUM_ITERATIONS,
                                  ctx->crypto,
                                  scratch_pool);
  if (apr_err != APR_SUCCESS)
    return svn_error_trace(crypto_error_create(
                               ctx, apr_err,
                               _("Error creating derived key")));
  if (! key)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Error creating derived key"));
  if (iv_len == 0)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Unexpected IV length returned"));

  /* Generate the proper length IV.  */
  SVN_ERR(get_random_bytes(&iv_vector, ctx, iv_len, result_pool));

  /* Initialize block encryption. */
  apr_err = apr_crypto_block_encrypt_init(&block_ctx, &iv_vector, key,
                                          &block_size, scratch_pool);
  if ((apr_err != APR_SUCCESS) || (! block_ctx))
    return svn_error_trace(crypto_error_create(
                             ctx, apr_err,
                             _("Error initializing block encryption")));

  /* Generate a blob of random data, block-aligned per the
     requirements of the encryption algorithm, but with a minimum size
     of our choosing.  */
#define MIN_STUFF_LEN 32
  if (MIN_STUFF_LEN % block_size)
    stuff_len = MIN_STUFF_LEN + (block_size - (MIN_STUFF_LEN % block_size));
  else
    stuff_len = MIN_STUFF_LEN;
  SVN_ERR(get_random_bytes(&stuff_vector, ctx, stuff_len, scratch_pool));

  /* ### FIXME:  This should be a SHA-256.  */
  SVN_ERR(svn_checksum(&stuff_sum, svn_checksum_sha1, stuff_vector,
                       stuff_len, scratch_pool));

  /* Get the length that we need to allocate.  */
  apr_err = apr_crypto_block_encrypt(NULL, &result_len, stuff_vector,
                                     stuff_len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error fetching result length"));
      goto cleanup;
    }

  /* Allocate our result buffer.  */
  result = apr_palloc(result_pool, result_len);

  /* Encrypt the block. */
  apr_err = apr_crypto_block_encrypt(&result, &result_len, stuff_vector,
                                     stuff_len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error during block encryption"));
      goto cleanup;
    }

  /* Finalize the block encryption. Since we padded everything, this should
     not produce any more encrypted output.  */
  apr_err = apr_crypto_block_encrypt_finish(NULL,
                                            &ignored_result_len,
                                            block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error finalizing block encryption"));
      goto cleanup;
    }

  *ciphertext = wrap_as_string(result, result_len, result_pool);
  *iv = wrap_as_string(iv_vector, iv_len, result_pool);
  *salt = wrap_as_string(salt_vector, SALT_LEN, result_pool);
  *checktext = svn_checksum_to_cstring(stuff_sum, result_pool);

 cleanup:
  apr_crypto_block_cleanup(block_ctx);
  return err;
#else /* SVN_HAVE_CRYPTO */
  return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
                          "Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}


svn_error_t *
svn_crypto__verify_secret(svn_boolean_t *is_valid,
                          svn_crypto__ctx_t *ctx,
                          const svn_string_t *master,
                          const svn_string_t *ciphertext,
                          const svn_string_t *iv,
                          const svn_string_t *salt,
                          const char *checktext,
                          apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
  svn_error_t *err = SVN_NO_ERROR;
  apr_status_t apr_err;
  apr_crypto_block_t *block_ctx = NULL;
  apr_size_t block_size, iv_len;
  apr_crypto_key_t *key = NULL;
  unsigned char *result;
  apr_size_t result_len = 0, final_len = 0;
  svn_checksum_t *result_sum;

  *is_valid = FALSE;

  /* Initialize the passphrase.  */
  apr_err = apr_crypto_passphrase(&key, &iv_len,
                                  master->data, master->len,
                                  (unsigned char *)salt->data, salt->len,
                                  APR_KEY_AES_256, APR_MODE_CBC,
                                  FALSE /* doPad */, NUM_ITERATIONS,
                                  ctx->crypto, scratch_pool);
  if (apr_err != APR_SUCCESS)
    return svn_error_trace(crypto_error_create(
                               ctx, apr_err,
                               _("Error creating derived key")));
  if (! key)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Error creating derived key"));
  if (iv_len == 0)
    return svn_error_create(APR_EGENERAL, NULL,
                            _("Unexpected IV length returned"));
  if (iv_len != iv->len)
    return svn_error_create(SVN_ERR_INCORRECT_PARAMS, NULL,
                            _("Provided IV has incorrect length"));

  apr_err = apr_crypto_block_decrypt_init(&block_ctx, &block_size,
                                          (unsigned char *)iv->data,
                                          key, scratch_pool);
  if ((apr_err != APR_SUCCESS) || (! block_ctx))
    return svn_error_trace(crypto_error_create(
                             ctx, apr_err,
                             _("Error initializing block decryption")));

  apr_err = apr_crypto_block_decrypt(NULL, &result_len,
                                     (unsigned char *)ciphertext->data,
                                     ciphertext->len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error fetching result length"));
      goto cleanup;
    }

  result = apr_palloc(scratch_pool, result_len);
  apr_err = apr_crypto_block_decrypt(&result, &result_len,
                                     (unsigned char *)ciphertext->data,
                                     ciphertext->len, block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error during block decryption"));
      goto cleanup;
    }

  apr_err = apr_crypto_block_decrypt_finish(result + result_len, &final_len,
                                            block_ctx);
  if (apr_err != APR_SUCCESS)
    {
      err = crypto_error_create(ctx, apr_err,
                                _("Error finalizing block decryption"));
      goto cleanup;
    }

  /* ### FIXME:  This should be a SHA-256.  */
  SVN_ERR(svn_checksum(&result_sum, svn_checksum_sha1, result,
                       result_len + final_len, scratch_pool));

  *is_valid = strcmp(checktext,
                     svn_checksum_to_cstring(result_sum, scratch_pool)) == 0;