Add some TLSv1.3 CCS tests

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/4701)

1 files changed, 492 insertions, 0 deletions

diff --git a/test/tls13ccstest.c b/test/tls13ccstest.c
new file mode 100644
index 0000000000..ef4a75ba35
--- /dev/null
+++ b/test/tls13ccstest.c
@@ -0,0 +1,492 @@
+/*
+ * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/ssl.h>
+#include <string.h>
+#include "ssltestlib.h"
+#include "testutil.h"
+#include "../ssl/packet_locl.h"
+
+static char *cert = NULL;
+static char *privkey = NULL;
+
+BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
+int chseen = 0, shseen = 0, sccsseen = 0, ccsaftersh = 0, ccsbeforesh = 0;
+int sappdataseen = 0, cappdataseen = 0, badccs = 0, badvers = 0, badsessid = 0;
+
+unsigned char chsessid[SSL_MAX_SSL_SESSION_ID_LENGTH];
+size_t chsessidlen = 0;
+
+static int watchccs_new(BIO *bi);
+static int watchccs_free(BIO *a);
+static int watchccs_read(BIO *b, char *out, int outl);
+static int watchccs_write(BIO *b, const char *in, int inl);
+static long watchccs_ctrl(BIO *b, int cmd, long num, void *ptr);
+static int watchccs_gets(BIO *bp, char *buf, int size);
+static int watchccs_puts(BIO *bp, const char *str);
+
+/* Choose a sufficiently large type likely to be unused for this custom BIO */
+# define BIO_TYPE_WATCHCCS_FILTER  (0x80 | BIO_TYPE_FILTER)
+
+static BIO_METHOD *method_watchccs = NULL;
+
+static const BIO_METHOD *bio_f_watchccs_filter()
+{
+    if (method_watchccs == NULL) {
+        method_watchccs = BIO_meth_new(BIO_TYPE_WATCHCCS_FILTER,
+                                       "Watch CCS filter");
+        if (   method_watchccs == NULL
+            || !BIO_meth_set_write(method_watchccs, watchccs_write)
+            || !BIO_meth_set_read(method_watchccs, watchccs_read)
+            || !BIO_meth_set_puts(method_watchccs, watchccs_puts)
+            || !BIO_meth_set_gets(method_watchccs, watchccs_gets)
+            || !BIO_meth_set_ctrl(method_watchccs, watchccs_ctrl)
+            || !BIO_meth_set_create(method_watchccs, watchccs_new)
+            || !BIO_meth_set_destroy(method_watchccs, watchccs_free))
+            return NULL;
+    }
+    return method_watchccs;
+}
+
+static int watchccs_new(BIO *bio)
+{
+    BIO_set_init(bio, 1);
+    return 1;
+}
+
+static int watchccs_free(BIO *bio)
+{
+    BIO_set_init(bio, 0);
+    return 1;
+}
+
+static int watchccs_read(BIO *bio, char *out, int outl)
+{
+    int ret = 0;
+    BIO *next = BIO_next(bio);
+
+    if (outl <= 0)
+        return 0;
+    if (next == NULL)
+        return 0;
+
+    BIO_clear_retry_flags(bio);
+
+    ret = BIO_read(next, out, outl);
+    if (ret <= 0 && BIO_should_read(next))
+        BIO_set_retry_read(bio);
+
+    return ret;
+}
+
+static int watchccs_write(BIO *bio, const char *in, int inl)
+{
+    int ret = 0;
+    BIO *next = BIO_next(bio);
+    PACKET pkt, msg, msgbody, sessionid;
+    unsigned int rectype, recvers, msgtype, expectedrecvers;
+
+    if (inl <= 0)
+        return 0;
+    if (next == NULL)
+        return 0;
+
+    BIO_clear_retry_flags(bio);
+
+    if (!PACKET_buf_init(&pkt, (const unsigned char *)in, inl))
+        return 0;
+
+    /* We assume that we always write complete records each time */
+    while (PACKET_remaining(&pkt)) {
+        if (!PACKET_get_1(&pkt, &rectype)
+                || !PACKET_get_net_2(&pkt, &recvers)
+                || !PACKET_get_length_prefixed_2(&pkt, &msg))
+            return 0;
+
+        expectedrecvers = TLS1_2_VERSION;
+
+        if (rectype == SSL3_RT_HANDSHAKE) {
+            if (!PACKET_get_1(&msg, &msgtype)
+                    || !PACKET_get_length_prefixed_3(&msg, &msgbody))
+                return 0;
+            if (msgtype == SSL3_MT_CLIENT_HELLO) {
+                chseen++;
+                expectedrecvers = TLS1_VERSION;
+                /*
+                 * Skip legacy_version (2 bytes) and Random (32 bytes) to read
+                 * session_id.
+                 */
+                if (!PACKET_forward(&msgbody, 34)
+                        || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
+                    return 0;
+
+                if (chseen == 1) {
+                    /* Save the session id for later */
+                    chsessidlen = PACKET_remaining(&sessionid);
+                    if (!PACKET_copy_bytes(&sessionid, chsessid, chsessidlen))
+                        return 0;
+                } else {
+                    /*
+                     * Check the session id for the second ClientHello is the
+                     * same as the first one.
+                     */
+                    if (PACKET_remaining(&sessionid) != chsessidlen
+                            || (chsessidlen > 0
+                                && memcmp(chsessid, PACKET_data(&sessionid),
+                                          chsessidlen) != 0))
+                        badsessid = 1;
+                }
+            } else if (msgtype == SSL3_MT_SERVER_HELLO) {
+                shseen++;
+                /*
+                 * Skip legacy_version (2 bytes) and Random (32 bytes) to read
+                 * session_id.
+                 */
+                if (!PACKET_forward(&msgbody, 34)
+                        || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
+                    return 0;
+
+                /*
+                 * Check the session id is the same as the one in the
+                 * ClientHello
+                 */
+                if (PACKET_remaining(&sessionid) != chsessidlen
+                        || (chsessidlen > 0
+                            && memcmp(chsessid, PACKET_data(&sessionid),
+                                      chsessidlen) != 0))
+                    badsessid = 1;
+            }
+        } else if (rectype == SSL3_RT_CHANGE_CIPHER_SPEC) {
+            if (bio == s_to_c_fbio) {
+                /*
+                 * Server writing. We shouldn't have written any app data
+                 * yet, and we should have seen both the ClientHello and the
+                 * ServerHello
+                 */
+                if (!sappdataseen
+                        && chseen == 1
+                        && shseen == 1
+                        && !sccsseen)
+                    sccsseen = 1;
+                else
+                    badccs = 1;
+            } else if (!cappdataseen) {
+                /*
+                 * Client writing. We shouldn't have written any app data
+                 * yet, and we should have seen the ClientHello
+                 */
+                if (shseen == 1 && !ccsaftersh)
+                    ccsaftersh = 1;
+                else if (shseen == 0 && !ccsbeforesh)
+                    ccsbeforesh = 1;
+                else
+                    badccs = 1;
+            } else {
+                badccs = 1;
+            }
+        } else if(rectype == SSL3_RT_APPLICATION_DATA) {
+            if (bio == s_to_c_fbio)
+                sappdataseen = 1;
+            else
+                cappdataseen = 1;
+        }
+        if (recvers != expectedrecvers)
+            badvers = 1;
+    }
+
+    ret = BIO_write(next, in, inl);
+    if (ret <= 0 && BIO_should_write(next))
+        BIO_set_retry_write(bio);
+
+    return ret;
+}
+
+static long watchccs_ctrl(BIO *bio, int cmd, long num, void *ptr)
+{
+    long ret;
+    BIO *next = BIO_next(bio);
+
+    if (next == NULL)
+        return 0;
+
+    switch (cmd) {
+    case BIO_CTRL_DUP:
+        ret = 0;
+        break;
+    default:
+        ret = BIO_ctrl(next, cmd, num, ptr);
+        break;
+    }
+    return ret;
+}
+
+static int watchccs_gets(BIO *bio, char *buf, int size)
+{
+    /* We don't support this - not needed anyway */
+    return -1;
+}
+
+static int watchccs_puts(BIO *bio, const char *str)
+{
+    return watchccs_write(bio, str, strlen(str));
+}
+
+static int test_tls13ccs(int tst)
+{
+    SSL_CTX *sctx = NULL, *cctx = NULL;
+    SSL *sssl = NULL, *cssl = NULL;
+    int ret = 0;
+    const char msg[] = "Dummy data";
+    char buf[80];
+    size_t written, readbytes;
+    SSL_SESSION *sess = NULL;
+
+    chseen = shseen = sccsseen = ccsaftersh = ccsbeforesh = 0;
+    sappdataseen = cappdataseen = badccs = badvers = badsessid = 0;
+    chsessidlen = 0;
+
+    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
+                                       &sctx, &cctx, cert, privkey)))
+        goto err;
+
+    /*
+     * Test 0: Simple Handshake
+     * Test 1: Simple Handshake, client middlebox compat mode disabled
+     * Test 2: Simple Handshake, server middlebox compat mode disabled
+     * Test 3: HRR Handshake
+     * Test 4: HRR Handshake, client middlebox compat mode disabled
+     * Test 5: HRR Handshake, server middlebox compat mode disabled
+     * Test 6: Early data handshake
+     * Test 7: Early data handshake, client middlebox compat mode disabled
+     * Test 8: Early data handshake, server middlebox compat mode disabled
+     * Test 9: Early data then HRR
+     * Test 10: Early data then HRR, client middlebox compat mode disabled
+     * Test 11: Early data then HRR, server middlebox compat mode disabled
+     */
+    switch (tst) {
+    case 0:
+    case 3:
+    case 6:
+    case 9:
+        break;
+    case 1:
+    case 4:
+    case 7:
+    case 10:
+        SSL_CTX_clear_options(cctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
+        break;
+    case 2:
+    case 5:
+    case 8:
+    case 11:
+        SSL_CTX_clear_options(sctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
+        break;
+    default:
+        TEST_error("Invalid test value");
+        goto err;
+    }
+
+    if (tst >= 6) {
+        /* Get a session suitable for early_data */
+        if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, NULL, NULL))
+                || !TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
+            goto err;
+        sess = SSL_get1_session(cssl);
+        if (!TEST_ptr(sess))
+            goto err;
+        SSL_shutdown(cssl);
+        SSL_shutdown(sssl);
+        SSL_free(sssl);
+        SSL_free(cssl);
+        sssl = cssl = NULL;
+    }
+
+    if ((tst >= 3 && tst <= 5) || tst >= 9) {
+        /* HRR handshake */
+        if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "P-256")))
+            goto err;
+    }
+
+    s_to_c_fbio = BIO_new(bio_f_watchccs_filter());
+    c_to_s_fbio = BIO_new(bio_f_watchccs_filter());
+    if (!TEST_ptr(s_to_c_fbio)
+            || !TEST_ptr(c_to_s_fbio)) {
+        BIO_free(s_to_c_fbio);
+        BIO_free(c_to_s_fbio);
+        goto err;
+    }
+
+    /* BIOs get freed on error */
+    if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, s_to_c_fbio,
+                                      c_to_s_fbio)))
+        goto err;
+
+    if (tst >= 6) {
+        /* Early data */
+        if (!TEST_true(SSL_set_session(cssl, sess))
+                || !TEST_true(SSL_write_early_data(cssl, msg, strlen(msg),
+                                                   &written))
+                || (tst <= 8
+                    && !TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
+                                                &readbytes),
+                                                SSL_READ_EARLY_DATA_SUCCESS)))
+            goto err;
+        if (tst <= 8) {
+            if (!TEST_int_gt(SSL_connect(cssl), 0))
+                goto err;
+        } else {
+            if (!TEST_int_le(SSL_connect(cssl), 0))
+                goto err;
+        }
+        if (!TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
+                                             &readbytes),
+                         SSL_READ_EARLY_DATA_FINISH))
+            goto err;
+    }
+
+    /* Perform handshake (or complete it if doing early data ) */
+    if (!TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
+        goto err;
+
+    /*
+     * Check there were no unexpected CCS messages, all record versions
+     * were as expected, and that the session ids were reflected by the server
+     * correctly.
+     */
+    if (!TEST_false(badccs) || !TEST_false(badvers) || !TEST_false(badsessid))
+        goto err;
+
+    switch (tst) {
+    case 0:
+        if (!TEST_true(sccsseen)
+                || !TEST_true(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 1:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_eq(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 2:
+        if (!TEST_false(sccsseen)
+                || !TEST_true(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 3:
+        if (!TEST_true(sccsseen)
+                || !TEST_true(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 4:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_eq(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 5:
+        if (!TEST_false(sccsseen)
+                || !TEST_true(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 6:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_true(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 7:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_eq(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 8:
+        if (!TEST_false(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_true(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 9:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_true(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 10:
+        if (!TEST_true(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_false(ccsbeforesh)
+                || !TEST_size_t_eq(chsessidlen, 0))
+            goto err;
+        break;
+
+    case 11:
+        if (!TEST_false(sccsseen)
+                || !TEST_false(ccsaftersh)
+                || !TEST_true(ccsbeforesh)
+                || !TEST_size_t_gt(chsessidlen, 0))
+            goto err;
+        break;
+
+    default:
+        TEST_error("Invalid test value");
+        goto err;
+    }
+
+    ret = 1;
+ err:
+    SSL_SESSION_free(sess);
+    SSL_free(sssl);
+    SSL_free(cssl);
+    SSL_CTX_free(sctx);
+    SSL_CTX_free(cctx);
+
+    return ret;
+}
+
+int setup_tests(void)
+{
+    if (!TEST_ptr(cert = test_get_argument(0))
+            || !TEST_ptr(privkey = test_get_argument(1)))
+        return 0;
+
+    ADD_ALL_TESTS(test_tls13ccs, 12);
+
+    return 1;
+}
+
+void cleanup_tests(void)
+{
+    BIO_meth_free(method_watchccs);
+}