tests: added check to verify that the server will bail out after many alerts

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6cf4a2dab219689e05cb01668ffff528fc1a11d6..50884c7bc6016edef0c04ac15edc05a883904149 100644 (file)
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -113,7 +113,8 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid       \
         safe-renegotiation/srn3 safe-renegotiation/srn4 safe-renegotiation/srn5 \
         rsa-illegal-import set_x509_key_file_ocsp_multi set_key set_x509_key_file_ocsp_multi2 \
         set_key_utf8 set_x509_key_utf8 insecure_key handshake-large-packet \
-        client_dsa_key server_ecdsa_key tls-session-ext-register tls-session-supplemental
+        client_dsa_key server_ecdsa_key tls-session-ext-register tls-session-supplemental \
+        multi-alerts
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp

diff --git a/tests/multi-alerts.c b/tests/multi-alerts.c
new file mode 100644 (file)
index 0000000..1506547
--- /dev/null
+++ b/tests/multi-alerts.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GnuTLS; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* In this test we check whether the server will bail out after receiving
+ * a bunch of warning alerts. That is to avoid DoS due to the assymetry of
+ * cost of sending an alert vs the cost of receiving.
+ */
+
+#if defined(_WIN32)
+
+/* socketpair isn't supported on Win32. */
+int main(int argc, char **argv)
+{
+       exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#if !defined(_WIN32)
+#include <sys/wait.h>
+#endif
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+
+#include "utils.h"
+#include "cert-common.h"
+
+pid_t child;
+
+static void tls_log_func(int level, const char *str)
+{
+       fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,
+               str);
+}
+
+static unsigned char tls_hello[] =
+       "\x16\x03\x01\x01\x38\x01\x00\x01"
+       "\x34\x03\x03\xfc\x77\xa8\xc7\x46"
+       "\xf7\xfd\x04\x5b\x3c\xc6\xfa\xa4"
+       "\xea\x3e\xfa\x76\x99\xfe\x1a\x2e"
+       "\xe0\x79\x17\xb2\x27\x06\xc4\x5c"
+       "\xd8\x78\x31\x00\x00\xb6\xc0\x30"
+       "\xc0\x2c\xc0\x28\xc0\x24\xc0\x14"
+       "\xc0\x0a\x00\xa5\x00\xa3\x00\xa1"
+       "\x00\x9f\x00\x6b\x00\x6a\x00\x69"
+       "\x00\x68\x00\x39\x00\x38\x00\x37"
+       "\x00\x36\x00\x88\x00\x87\x00\x86"
+       "\x00\x85\xc0\x32\xc0\x2e\xc0\x2a"
+       "\xc0\x26\xc0\x0f\xc0\x05\x00\x9d"
+       "\x00\x3d\x00\x35\x00\x84\xc0\x2f"
+       "\xc0\x2b\xc0\x27\xc0\x23\xc0\x13"
+       "\xc0\x09\x00\xa4\x00\xa2\x00\xa0"
+       "\x00\x9e\x00\x67\x00\x40\x00\x3f"
+       "\x00\x3e\x00\x33\x00\x32\x00\x31"
+       "\x00\x30\x00\x9a\x00\x99\x00\x98"
+       "\x00\x97\x00\x45\x00\x44\x00\x43"
+       "\x00\x42\xc0\x31\xc0\x2d\xc0\x29"
+       "\xc0\x25\xc0\x0e\xc0\x04\x00\x9c"
+       "\x00\x3c\x00\x2f\x00\x96\x00\x41"
+       "\x00\x07\xc0\x11\xc0\x07\xc0\x0c"
+       "\xc0\x02\x00\x05\x00\x04\xc0\x12"
+       "\xc0\x08\x00\x16\x00\x13\x00\x10"
+       "\x00\x0d\xc0\x0d\xc0\x03\x00\x0a"
+       "\x00\x15\x00\x12\x00\x0f\x00\x0c"
+       "\x00\x09\x00\xff\x01\x00\x00\x55"
+       "\x00\x0b\x00\x04\x03\x00\x01\x02"
+       "\x00\x0a\x00\x1c\x00\x1a\x00\x17"
+       "\x00\x19\x00\x1c\x00\x1b\x00\x18"
+       "\x00\x1a\x00\x16\x00\x0e\x00\x0d"
+       "\x00\x0b\x00\x0c\x00\x09\x00\x0a"
+       "\x00\x23\x00\x00\x00\x0d\x00\x20"
+       "\x00\x1e\x06\x01\x06\x02\x06\x03"
+       "\x05\x01\x05\x02\x05\x03\x04\x01"
+       "\x04\x02\x04\x03\x03\x01\x03\x02"
+       "\x03\x03\x02\x01\x02\x02\x02\x03"
+       "\x00\x0f\x00\x01\x01";
+
+static unsigned char tls_alert[] = 
+       "\x15\x03\x03\x00\x02\x00\x0A";
+
+static void client(int sd)
+{
+       char buf[1024];
+       int ret;
+       unsigned i;
+
+       /* send a TLS hello, and then a list of warning alerts */
+
+       ret = send(sd, tls_hello, sizeof(tls_hello)-1, 0);
+       if (ret < 0)
+               fail("error sending hello\n");
+
+       ret = recv(sd, buf, sizeof(buf), 0);
+       if (ret < 0)
+               fail("error receiving hello\n");
+
+       for (i=0;i<128;i++) {
+               ret = send(sd, tls_alert, sizeof(tls_alert)-1, 0);
+               if (ret < 0)
+                       fail("error sending hello\n");
+       }
+
+       close(sd);
+}
+
+static void server(int sd)
+{
+       gnutls_certificate_credentials_t x509_cred;
+       gnutls_session_t session;
+       int ret;
+       unsigned loops;
+
+       /* this must be called once in the program
+        */
+       global_init();
+
+       gnutls_global_set_log_function(tls_log_func);
+       if (debug)
+               gnutls_global_set_log_level(6);
+
+       gnutls_certificate_allocate_credentials(&x509_cred);
+       gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,
+                                             GNUTLS_X509_FMT_PEM);
+
+       gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,
+                                           &server_ca3_key,
+                                           GNUTLS_X509_FMT_PEM);
+
+       if (debug)
+               success("Launched, generating DH parameters...\n");
+
+       gnutls_init(&session, GNUTLS_SERVER);
+
+       /* avoid calling all the priority functions, since the defaults
+        * are adequate.
+        */
+       gnutls_priority_set_direct(session, "NORMAL", NULL);
+
+       gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+       gnutls_transport_set_int(session, sd);
+       loops = 0;
+       do {
+               ret = gnutls_handshake(session);
+               loops++;
+               if (loops > 64)
+                       fail("Too many loops in the handshake!\n");
+       } while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_WARNING_ALERT_RECEIVED);
+
+       if (ret >= 0) {
+               fail("server: Handshake succeeded unexpectedly\n");
+       }
+
+       close(sd);
+       gnutls_deinit(session);
+
+       gnutls_certificate_free_credentials(x509_cred);
+
+       gnutls_global_deinit();
+
+       if (debug)
+               success("server: finished\n");
+}
+
+
+void doit(void)
+{
+       int sockets[2];
+       int err;
+
+       err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+       if (err == -1) {
+               perror("socketpair");
+               fail("socketpair failed\n");
+               return;
+       }
+
+       child = fork();
+       if (child < 0) {
+               perror("fork");
+               fail("fork");
+               return;
+       }
+
+       if (child) {
+               int status;
+
+               server(sockets[0]);
+               wait(&status);
+       } else
+               client(sockets[1]);
+}
+
+#endif                         /* _WIN32 */