ci: split up aead tests

tests/unit/s2n_aead_aes128_test.c

@@ -0,0 +1,213 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 <stdio.h>
+#include <string.h>
+
+#include "api/s2n.h"
+#include "crypto/s2n_cipher.h"
+#include "crypto/s2n_hmac.h"
+#include "s2n_aead_test_utils.h"
+#include "s2n_test.h"
+#include "stuffer/s2n_stuffer.h"
+#include "testlib/s2n_testlib.h"
+#include "tls/s2n_cipher_suites.h"
+#include "tls/s2n_prf.h"
+#include "tls/s2n_record.h"
+#include "utils/s2n_random.h"
+#include "utils/s2n_safety.h"
+
+int main(int argc, char **argv)
+{
+    struct s2n_connection *conn = NULL;
+    uint8_t random_data[S2N_SMALL_FRAGMENT_LENGTH + 1];
+    uint8_t aes128_key[] = "123456789012345";
+    struct s2n_blob aes128 = { 0 };
+    EXPECT_SUCCESS(s2n_blob_init(&aes128, aes128_key, sizeof(aes128_key)));
+    struct s2n_blob r = { 0 };
+    EXPECT_SUCCESS(s2n_blob_init(&r, random_data, sizeof(random_data)));
+
+    BEGIN_TEST();
+    EXPECT_SUCCESS(s2n_disable_tls13_in_test());
+
+    EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
+    EXPECT_OK(s2n_get_public_random_data(&r));
+
+    /* Peer and we are in sync */
+    conn->server = conn->initial;
+    conn->client = conn->initial;
+
+    /* test the AES128 cipher */
+    conn->initial->cipher_suite->record_alg = &s2n_record_alg_aes128_gcm;
+    EXPECT_SUCCESS(s2n_aead_test_setup_keys(conn, &aes128));
+
+    int max_fragment = S2N_SMALL_FRAGMENT_LENGTH;
+    for (size_t i = 0; i <= max_fragment + 1; i++) {
+        struct s2n_blob in = { 0 };
+        EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
+        int bytes_written = 0;
+
+        /* TLS packet on the wire using AES-GCM:
+         * https://tools.ietf.org/html/rfc5246#section-6.2.3.3
+         * https://tools.ietf.org/html/rfc5288#section-3
+         * ----------------------------------------------
+         * |TLS header|explicit IV|encrypted payload|TAG|
+         * ----------------------------------------------
+         * Length:
+         * S2N_TLS_RECORD_HEADER_LENGTH + S2N_TLS_GCM_EXPLICIT_IV_LEN + i + S2N_TLS_GCM_TAG_LEN
+         */
+
+        EXPECT_SUCCESS(s2n_aead_test_prep_connection(conn, &s2n_record_alg_aes128_gcm, &aes128));
+        EXPECT_SUCCESS(s2n_connection_prefer_low_latency(conn));
+
+        s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
+        if (i <= max_fragment) {
+            EXPECT_OK(result);
+            bytes_written = i;
+        } else {
+            EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
+            bytes_written = max_fragment;
+        }
+
+        uint16_t predicted_length = bytes_written;
+        predicted_length += conn->initial->cipher_suite->record_alg->cipher->io.aead.record_iv_size;
+        predicted_length += conn->initial->cipher_suite->record_alg->cipher->io.aead.tag_size;
+
+        const int overhead = S2N_TLS_GCM_EXPLICIT_IV_LEN /* Explicit IV */
+                + S2N_TLS_GCM_TAG_LEN /* TAG */;
+        EXPECT_EQUAL(predicted_length, bytes_written + overhead);
+
+        EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
+        EXPECT_EQUAL(conn->out.blob.data[1], 3);
+        EXPECT_EQUAL(conn->out.blob.data[2], 3);
+        EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
+        EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
+
+        /* The data should be encrypted */
+        if (bytes_written > 10) {
+            EXPECT_NOT_EQUAL(memcmp(conn->out.blob.data + S2N_TLS_RECORD_HEADER_LENGTH, random_data, bytes_written), 0);
+        }
+
+        /* Copy the encrypted out data to the in data */
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+        EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
+        EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
+
+        /* Let's decrypt it */
+        uint8_t content_type = 0;
+        uint16_t fragment_length = 0;
+        EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
+        EXPECT_SUCCESS(s2n_record_parse(conn));
+        EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
+        EXPECT_EQUAL(fragment_length, predicted_length);
+
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+
+        /* Start over */
+        EXPECT_SUCCESS(s2n_aead_test_prep_connection(conn, &s2n_record_alg_aes128_gcm, &aes128));
+        EXPECT_OK(s2n_record_write(conn, TLS_APPLICATION_DATA, &in));
+
+        /* Now lets corrupt some data and ensure the tests pass */
+        /* Copy the encrypted out data to the in data */
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+        EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
+        EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
+
+        /* Tamper the protocol version in the header, and ensure decryption fails, as we use this in the AAD */
+        EXPECT_EQUAL(conn->header_in.blob.data[0], TLS_APPLICATION_DATA);
+        conn->header_in.blob.data[0] ^= 1; /* Flip a bit in the content_type of the TLS Record Header */
+
+        EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
+        EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA ^ 1);
+
+        /**
+         * We are trying to test the case when the Additional Authenticated Data in AEAD ciphers is tampered with.
+         *
+         * AEAD Ciphers authenticate several fields, including the TLS Record content_type, so this should fail since
+         * we flipped a bit. See s2n_aead_aad_init() for which fields are added to the additional authenticated data.
+         *
+         * We can't flip the TLS Protocol Version bits here because s2n_record_header_parse() will error before we
+         * attempt decryption with AES-GCM because the Protocol version doesn't match "conn->actual_protocol_version".
+         */
+        EXPECT_FAILURE(s2n_record_parse(conn));
+
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+        EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+
+        /* Tamper with the explicit IV and ensure decryption fails */
+        for (size_t j = 0; j < S2N_TLS_GCM_EXPLICIT_IV_LEN; j++) {
+            EXPECT_SUCCESS(s2n_aead_test_prep_connection(conn, &s2n_record_alg_aes128_gcm, &aes128));
+            EXPECT_OK(s2n_record_write(conn, TLS_APPLICATION_DATA, &in));
+
+            /* Copy the encrypted out data to the in data */
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
+            conn->in.blob.data[j]++;
+            EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
+            EXPECT_FAILURE(s2n_record_parse(conn));
+            EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
+
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+        }
+
+        /* Tamper with the TAG and ensure decryption fails */
+        for (size_t j = 0; j < S2N_TLS_GCM_TAG_LEN; j++) {
+            EXPECT_SUCCESS(s2n_aead_test_prep_connection(conn, &s2n_record_alg_aes128_gcm, &aes128));
+            EXPECT_OK(s2n_record_write(conn, TLS_APPLICATION_DATA, &in));
+
+            /* Copy the encrypted out data to the in data */
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
+            conn->in.blob.data[s2n_stuffer_data_available(&conn->in) - j - 1]++;
+            EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
+            EXPECT_FAILURE(s2n_record_parse(conn));
+            EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
+
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+        }
+
+        /* Tamper with the encrypted payload in the ciphertext and ensure decryption fails */
+        for (size_t j = 0; j < i; j++) {
+            EXPECT_SUCCESS(s2n_aead_test_prep_connection(conn, &s2n_record_alg_aes128_gcm, &aes128));
+            EXPECT_OK(s2n_record_write(conn, TLS_APPLICATION_DATA, &in));
+
+            /* Copy the encrypted out data to the in data */
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
+            EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
+            conn->in.blob.data[S2N_TLS_GCM_EXPLICIT_IV_LEN + j]++;
+            EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
+            EXPECT_FAILURE(s2n_record_parse(conn));
+            EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
+
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
+            EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
+        }
+    }
+    EXPECT_SUCCESS(s2n_aead_test_destroy_keys(conn));
+    EXPECT_SUCCESS(s2n_connection_free(conn));
+
+    END_TEST();
+}