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/*
* Copyright 2019-present MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongocrypt-ciphertext-private.h"
#include "mongocrypt-crypto-private.h"
#include "mongocrypt-marking-private.h"
#include "mongocrypt-private.h"
#include "test-mongocrypt.h"
/* From BSON Binary subtype 6 specification:
struct fle_blob {
uint8 fle_blob_subtype = (1 or 2);
uint8 key_uuid[16];
uint8 original_bson_type;
uint8 ciphertext[ciphertext_length];
}
*/
static void _test_ciphertext_serialization(_mongocrypt_tester_t *tester) {
_mongocrypt_ciphertext_t original, returned;
_mongocrypt_buffer_t serialized;
char *expected = "\x01\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C"
"\x0D\x0E\x0F\x02\x00\x01";
mongocrypt_status_t *status;
_mongocrypt_ciphertext_init(&original);
_mongocrypt_ciphertext_init(&returned);
_mongocrypt_buffer_init(&serialized);
status = mongocrypt_status_new();
original.blob_subtype = 1;
original.original_bson_type = 2;
_mongocrypt_tester_fill_buffer(&original.data, 2);
_mongocrypt_tester_fill_buffer(&original.key_id, 16);
BSON_ASSERT(_mongocrypt_serialize_ciphertext(&original, &serialized));
BSON_ASSERT(0 == memcmp(expected, serialized.data, serialized.len));
/* Now parse it back, should get the same ciphertext. */
BSON_ASSERT(_mongocrypt_ciphertext_parse_unowned(&serialized, &returned, status));
BSON_ASSERT(original.blob_subtype == returned.blob_subtype);
BSON_ASSERT(original.original_bson_type == returned.original_bson_type);
BSON_ASSERT(0 == _mongocrypt_buffer_cmp(&original.key_id, &returned.key_id));
BSON_ASSERT(0 == _mongocrypt_buffer_cmp(&original.data, &returned.data));
_mongocrypt_ciphertext_cleanup(&original);
_mongocrypt_ciphertext_cleanup(&returned);
_mongocrypt_buffer_cleanup(&serialized);
mongocrypt_status_destroy(status);
}
static void _test_malformed_ciphertext(_mongocrypt_tester_t *tester) {
_mongocrypt_buffer_t serialized;
_mongocrypt_ciphertext_t returned;
mongocrypt_status_t *status;
status = mongocrypt_status_new();
/* the minimum size for a ciphertext is 19 bytes. */
_mongocrypt_tester_fill_buffer(&serialized, 18);
BSON_ASSERT(!_mongocrypt_ciphertext_parse_unowned(&serialized, &returned, status));
BSON_ASSERT(0 == strcmp(mongocrypt_status_message(status, NULL), "malformed ciphertext, too small"));
_mongocrypt_buffer_cleanup(&serialized);
_mongocrypt_tester_fill_buffer(&serialized, 19);
/* give a valid blob_subtype. */
serialized.data[0] = 1;
BSON_ASSERT(_mongocrypt_ciphertext_parse_unowned(&serialized, &returned, status));
/* now an invalid blob_subtype. */
serialized.data[0] = 16;
BSON_ASSERT(!_mongocrypt_ciphertext_parse_unowned(&serialized, &returned, status));
BSON_ASSERT(
0 == strcmp(mongocrypt_status_message(status, NULL), "malformed ciphertext, expected blob subtype of 1 or 2"));
_mongocrypt_ciphertext_cleanup(&returned);
_mongocrypt_buffer_cleanup(&serialized);
mongocrypt_status_destroy(status);
}
static void _test_ciphertext_algorithm(_mongocrypt_tester_t *tester) {
mongocrypt_t *crypt;
mongocrypt_ctx_t *ctx;
mongocrypt_status_t *status;
_mongocrypt_key_broker_t *kb;
_mongocrypt_buffer_t zeros;
_mongocrypt_ciphertext_t type1_valueA, type1_valueA_again, type2_valueA, type1_valueB;
_mongocrypt_marking_t marking = {0};
bson_iter_t a_iter, b_iter;
bson_t *bson;
bool res;
status = mongocrypt_status_new();
_mongocrypt_ciphertext_init(&type1_valueA);
_mongocrypt_ciphertext_init(&type1_valueA_again);
_mongocrypt_ciphertext_init(&type2_valueA);
_mongocrypt_ciphertext_init(&type1_valueB);
_mongocrypt_buffer_init(&zeros);
_mongocrypt_buffer_resize(&zeros, MONGOCRYPT_IV_LEN);
memset(zeros.data, 0, MONGOCRYPT_IV_LEN);
crypt = _mongocrypt_tester_mongocrypt(TESTER_MONGOCRYPT_DEFAULT);
/* use a mongocrypt_ctx_t to get a key broker */
ctx = mongocrypt_ctx_new(crypt);
ASSERT_OK(mongocrypt_ctx_encrypt_init(ctx, "test", -1, TEST_FILE("./test/example/cmd.json")), ctx);
_mongocrypt_buffer_from_binary(&marking.u.fle1.key_id, TEST_BIN(16));
marking.u.fle1.key_id.subtype = BSON_SUBTYPE_UUID;
kb = &ctx->kb;
_mongocrypt_key_broker_add_test_key(kb, &marking.u.fle1.key_id);
bson = BCON_NEW("v", "a", "v", "b");
bson_iter_init(&a_iter, bson);
bson_iter_next(&a_iter);
bson_iter_init(&b_iter, bson);
bson_iter_next(&b_iter);
bson_iter_next(&b_iter);
/* Marking type = 1, plaintext = a */
marking.u.fle1.algorithm = 1;
memcpy(&marking.u.fle1.v_iter, &a_iter, sizeof(bson_iter_t));
res = _mongocrypt_marking_to_ciphertext((void *)kb, &marking, &type1_valueA, status);
ASSERT_OR_PRINT(res, status);
/* Marking type = 1, plaintext = a */
marking.u.fle1.algorithm = 1;
memcpy(&marking.u.fle1.v_iter, &a_iter, sizeof(bson_iter_t));
res = _mongocrypt_marking_to_ciphertext((void *)kb, &marking, &type1_valueA_again, status);
ASSERT_OR_PRINT(res, status);
/* Marking type = 2, plaintext = a */
marking.u.fle1.algorithm = 2;
memcpy(&marking.u.fle1.v_iter, &a_iter, sizeof(bson_iter_t));
res = _mongocrypt_marking_to_ciphertext((void *)kb, &marking, &type2_valueA, status);
ASSERT_OR_PRINT(res, status);
/* Marking type = 1, plaintext = b */
marking.u.fle1.algorithm = 1;
memcpy(&marking.u.fle1.v_iter, &b_iter, sizeof(bson_iter_t));
res = _mongocrypt_marking_to_ciphertext((void *)kb, &marking, &type1_valueB, status);
ASSERT_OR_PRINT(res, status);
/* Shorten all buffers to their IV length's */
type1_valueA.data.len = MONGOCRYPT_IV_LEN;
type1_valueA_again.data.len = MONGOCRYPT_IV_LEN;
type2_valueA.data.len = MONGOCRYPT_IV_LEN;
type1_valueB.data.len = MONGOCRYPT_IV_LEN;
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type1_valueA.data, &zeros));
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type1_valueA_again.data, &zeros));
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type2_valueA.data, &zeros));
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type1_valueB.data, &zeros));
/* Type 1 IV should be repeatable for same plaintext. */
BSON_ASSERT(0 == _mongocrypt_buffer_cmp(&type1_valueA.data, &type1_valueA_again.data));
/* Type 1 IV should differ from type 2 random IV. */
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type1_valueA.data, &type2_valueA.data));
/* Type 1 IV should differ if plaintext differs. */
BSON_ASSERT(0 != _mongocrypt_buffer_cmp(&type1_valueA.data, &type1_valueB.data));
_mongocrypt_ciphertext_cleanup(&type1_valueA);
_mongocrypt_ciphertext_cleanup(&type1_valueA_again);
_mongocrypt_ciphertext_cleanup(&type2_valueA);
_mongocrypt_ciphertext_cleanup(&type1_valueB);
_mongocrypt_buffer_cleanup(&zeros);
_mongocrypt_marking_cleanup(&marking);
mongocrypt_ctx_destroy(ctx);
mongocrypt_destroy(crypt);
bson_destroy(bson);
mongocrypt_status_destroy(status);
}
static void _test_ciphertext_serialize_associated_data(_mongocrypt_tester_t *tester) {
_mongocrypt_ciphertext_t ciphertext;
_mongocrypt_buffer_t serialized;
/* Expected associated data is:
* One byte for blob subtype for deterministic encryption:
* \x01
* Followed by 16 byte UUID, a repeating 123 pattern:
* \x01\x02\x03\x01\x02\x03\x01\x02\x03\x01\x02\x03\x01\x02\x03\x01
* Followed by the BSON type for UTF8
* \x02
*/
char *expected = "\x01\x01\x02\x03\x01\x02\x03\x01\x02\x03\x01\x02\x03\x01"
"\x02\x03\x01\x02";
_mongocrypt_ciphertext_init(&ciphertext);
_mongocrypt_buffer_init(&serialized);
/* Create a UUID */
_mongocrypt_buffer_from_binary(&ciphertext.key_id, TEST_BIN(16));
ciphertext.key_id.subtype = BSON_SUBTYPE_UUID;
ciphertext.original_bson_type = BSON_TYPE_UTF8;
ciphertext.blob_subtype = MC_SUBTYPE_FLE1DeterministicEncryptedValue;
BSON_ASSERT(_mongocrypt_ciphertext_serialize_associated_data(&ciphertext, &serialized));
BSON_ASSERT(serialized.len == 18);
BSON_ASSERT(0 == memcmp(serialized.data, expected, strlen(expected)));
_mongocrypt_ciphertext_cleanup(&ciphertext);
_mongocrypt_buffer_cleanup(&serialized);
}
void _mongocrypt_tester_install_ciphertext(_mongocrypt_tester_t *tester) {
INSTALL_TEST(_test_malformed_ciphertext);
INSTALL_TEST(_test_ciphertext_serialization);
INSTALL_TEST(_test_ciphertext_algorithm);
INSTALL_TEST(_test_ciphertext_serialize_associated_data);
}
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