Add DTLS replay protection test

Injects a record from epoch 1 during epoch 0 handshake, with a record
sequence number in the future, to test that the record replay protection
feature works as expected. This is described more fully in the next commit.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 16 insertions, 4 deletions

diff --git a/test/dtlstest.c b/test/dtlstest.c
index c2aa7ee71a..06db5d28bd 100644
--- a/test/dtlstest.c
+++ b/test/dtlstest.c
@@ -18,6 +18,8 @@
 static char *cert = NULL;
 static char *privkey = NULL;
 
+#define NUM_TESTS   2
+
 
 #define DUMMY_CERT_STATUS_LEN  12
 
@@ -36,13 +38,17 @@ unsigned char certstatus[] = {
     0x80, 0x80, 0x80, 0x80, 0x80 /* Dummy data */
 };
 
-static int test_dtls_unprocessed(void)
+#define RECORD_SEQUENCE 10
+
+static int test_dtls_unprocessed(int testidx)
 {
     SSL_CTX *sctx = NULL, *cctx = NULL;
     SSL *serverssl1 = NULL, *clientssl1 = NULL;
     BIO *c_to_s_fbio, *c_to_s_mempacket;
     int testresult = 0;
 
+    printf("Starting Test %d\n", testidx);
+
     if (!create_ssl_ctx_pair(DTLS_server_method(), DTLS_client_method(), &sctx,
                              &cctx, cert, privkey)) {
         printf("Unable to create SSL_CTX pair\n");
@@ -67,9 +73,15 @@ static int test_dtls_unprocessed(void)
         goto end;
     }
 
+    if (testidx == 1)
+        certstatus[RECORD_SEQUENCE] = 0xff;
+
     /*
-     * Inject a dummy record from the next epoch. This should never get used
-     * because the message sequence number is too big
+     * Inject a dummy record from the next epoch. In test 0, this should never
+     * get used because the message sequence number is too big. In test 1 we set
+     * the record sequence number to be way off in the future. This should not
+     * have an impact on the record replay protection because the record should
+     * be dropped before it is marked as arrived
      */
     c_to_s_mempacket = SSL_get_wbio(clientssl1);
     c_to_s_mempacket = BIO_next(c_to_s_mempacket);
@@ -110,7 +122,7 @@ int main(int argc, char *argv[])
     CRYPTO_set_mem_debug(1);
     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 
-    ADD_TEST(test_dtls_unprocessed);
+    ADD_ALL_TESTS(test_dtls_unprocessed, NUM_TESTS);
 
     testresult = run_tests(argv[0]);