test/sslcorrupttest.c

   1 /*
   2  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include "ssltestlib.h"
  12 #include "testutil.h"
  13
  14 static int docorrupt = 0;
  15
  16 static void copy_flags(BIO *bio)
  17 {
  18     int flags;
  19     BIO *next = BIO_next(bio);
  20
  21     flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  22     BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  23     BIO_set_flags(bio, flags);
  24 }
  25
  26 static int tls_corrupt_read(BIO *bio, char *out, int outl)
  27 {
  28     int ret;
  29     BIO *next = BIO_next(bio);
  30
  31     ret = BIO_read(next, out, outl);
  32     copy_flags(bio);
  33
  34     return ret;
  35 }
  36
  37 static int tls_corrupt_write(BIO *bio, const char *in, int inl)
  38 {
  39     int ret;
  40     BIO *next = BIO_next(bio);
  41     char *copy;
  42
  43     if (docorrupt) {
  44         copy = BUF_memdup(in, inl);
  45         TEST_check(copy != NULL);
  46         /* corrupt last bit of application data */
  47         copy[inl-1] ^= 1;
  48         ret = BIO_write(next, copy, inl);
  49         OPENSSL_free(copy);
  50     } else {
  51         ret = BIO_write(next, in, inl);
  52     }
  53     copy_flags(bio);
  54
  55     return ret;
  56 }
  57
  58 static long tls_corrupt_ctrl(BIO *bio, int cmd, long num, void *ptr)
  59 {
  60     long ret;
  61     BIO *next = BIO_next(bio);
  62
  63     if (next == NULL)
  64         return 0;
  65
  66     switch (cmd) {
  67     case BIO_CTRL_DUP:
  68         ret = 0L;
  69         break;
  70     default:
  71         ret = BIO_ctrl(next, cmd, num, ptr);
  72         break;
  73     }
  74     return ret;
  75 }
  76
  77 static int tls_corrupt_gets(BIO *bio, char *buf, int size)
  78 {
  79     /* We don't support this - not needed anyway */
  80     return -1;
  81 }
  82
  83 static int tls_corrupt_puts(BIO *bio, const char *str)
  84 {
  85     /* We don't support this - not needed anyway */
  86     return -1;
  87 }
  88
  89 static int tls_corrupt_new(BIO *bio)
  90 {
  91     BIO_set_init(bio, 1);
  92
  93     return 1;
  94 }
  95
  96 static int tls_corrupt_free(BIO *bio)
  97 {
  98     BIO_set_init(bio, 0);
  99
 100     return 1;
 101 }
 102
 103 #define BIO_TYPE_CUSTOM_FILTER  (0x80 | BIO_TYPE_FILTER)
 104
 105 static BIO_METHOD *method_tls_corrupt = NULL;
 106
 107 /* Note: Not thread safe! */
 108 static const BIO_METHOD *bio_f_tls_corrupt_filter(void)
 109 {
 110     if (method_tls_corrupt == NULL) {
 111         method_tls_corrupt = BIO_meth_new(BIO_TYPE_CUSTOM_FILTER,
 112                                           "TLS corrupt filter");
 113         if (   method_tls_corrupt == NULL
 114             || !BIO_meth_set_write(method_tls_corrupt, tls_corrupt_write)
 115             || !BIO_meth_set_read(method_tls_corrupt, tls_corrupt_read)
 116             || !BIO_meth_set_puts(method_tls_corrupt, tls_corrupt_puts)
 117             || !BIO_meth_set_gets(method_tls_corrupt, tls_corrupt_gets)
 118             || !BIO_meth_set_ctrl(method_tls_corrupt, tls_corrupt_ctrl)
 119             || !BIO_meth_set_create(method_tls_corrupt, tls_corrupt_new)
 120             || !BIO_meth_set_destroy(method_tls_corrupt, tls_corrupt_free))
 121             return NULL;
 122     }
 123     return method_tls_corrupt;
 124 }
 125
 126 static void bio_f_tls_corrupt_filter_free(void)
 127 {
 128     BIO_meth_free(method_tls_corrupt);
 129 }
 130
 131 /*
 132  * The test is supposed to be executed with RSA key, customarily
 133  * with apps/server.pem used even in other tests. For this reason
 134  * |cipher_list| is initialized with RSA ciphers' names. This
 135  * naturally means that if test is to be re-purposed for other
 136  * type of key, then NID_auth_* filter below would need adjustment.
 137  */
 138 static const char **cipher_list = NULL;
 139
 140 static int setup_cipher_list()
 141 {
 142     SSL_CTX *ctx = NULL;
 143     SSL *ssl = NULL;
 144     static STACK_OF(SSL_CIPHER) *sk_ciphers = NULL;
 145     int i, numciphers;
 146
 147     ctx = SSL_CTX_new(TLS_server_method());
 148     TEST_check(ctx != NULL);
 149     ssl = SSL_new(ctx);
 150     TEST_check(ssl != NULL);
 151     sk_ciphers = SSL_get1_supported_ciphers(ssl);
 152     TEST_check(sk_ciphers != NULL);
 153
 154     /*
 155      * The |cipher_list| will be filled only with names of RSA ciphers,
 156      * so that some of the allocated space will be wasted, but the loss
 157      * is deemed acceptable...
 158      */
 159     cipher_list = OPENSSL_malloc(sk_SSL_CIPHER_num(sk_ciphers) *
 160                                  sizeof(cipher_list[0]));
 161     TEST_check(cipher_list != NULL);
 162
 163     for (numciphers = 0, i = 0; i < sk_SSL_CIPHER_num(sk_ciphers); i++) {
 164         const SSL_CIPHER *cipher = sk_SSL_CIPHER_value(sk_ciphers, i);
 165
 166         if (SSL_CIPHER_get_auth_nid(cipher) == NID_auth_rsa)
 167             cipher_list[numciphers++] = SSL_CIPHER_get_name(cipher);
 168     }
 169     TEST_check(numciphers != 0);
 170
 171     sk_SSL_CIPHER_free(sk_ciphers);
 172     SSL_free(ssl);
 173     SSL_CTX_free(ctx);
 174
 175     return numciphers;
 176 }
 177
 178 static char *cert = NULL;
 179 static char *privkey = NULL;
 180
 181 static int test_ssl_corrupt(int testidx)
 182 {
 183     static unsigned char junk[16000] = { 0 };
 184     SSL_CTX *sctx = NULL, *cctx = NULL;
 185     SSL *server = NULL, *client = NULL;
 186     BIO *c_to_s_fbio;
 187     int testresult = 0;
 188     STACK_OF(SSL_CIPHER) *ciphers;
 189     const SSL_CIPHER *currcipher;
 190
 191     docorrupt = 0;
 192
 193     TEST_info("Starting #%d, %s", testidx, cipher_list[testidx]);
 194
 195     if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(),
 196                                        TLS_client_method(), &sctx,
 197                                        &cctx, cert, privkey)))
 198         return 0;
 199
 200     if (!TEST_true(SSL_CTX_set_cipher_list(cctx, cipher_list[testidx])))
 201         goto end;
 202
 203     if (!TEST_ptr(ciphers = SSL_CTX_get_ciphers(cctx))
 204             || !TEST_int_eq(sk_SSL_CIPHER_num(ciphers), 1)
 205             || !TEST_ptr(currcipher = sk_SSL_CIPHER_value(ciphers, 0)))
 206         goto end;
 207
 208     /*
 209      * If we haven't got a TLSv1.3 cipher, then we mustn't attempt to use
 210      * TLSv1.3. Version negotiation happens before cipher selection, so we will
 211      * get a "no shared cipher" error.
 212      */
 213     if (strcmp(SSL_CIPHER_get_version(currcipher), "TLSv1.3") != 0) {
 214         if (!TEST_true(SSL_CTX_set_max_proto_version(cctx, TLS1_2_VERSION)))
 215             goto end;
 216     }
 217
 218     if (!TEST_ptr(c_to_s_fbio = BIO_new(bio_f_tls_corrupt_filter())))
 219         goto end;
 220
 221     /* BIO is freed by create_ssl_connection on error */
 222     if (!TEST_true(create_ssl_objects(sctx, cctx, &server, &client, NULL,
 223                                       c_to_s_fbio)))
 224         goto end;
 225
 226     if (!TEST_true(create_ssl_connection(server, client, SSL_ERROR_NONE)))
 227         goto end;
 228
 229     docorrupt = 1;
 230
 231     if (!TEST_int_ge(SSL_write(client, junk, sizeof(junk)), 0))
 232         goto end;
 233
 234     if (!TEST_int_lt(SSL_read(server, junk, sizeof(junk)), 0))
 235         goto end;
 236
 237     if (!TEST_int_eq(ERR_GET_REASON(ERR_peek_error()),
 238                      SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC))
 239         goto end;
 240
 241     testresult = 1;
 242  end:
 243     SSL_free(server);
 244     SSL_free(client);
 245     SSL_CTX_free(sctx);
 246     SSL_CTX_free(cctx);
 247     return testresult;
 248 }
 249
 250 int test_main(int argc, char *argv[])
 251 {
 252     int ret;
 253
 254     if (argc != 3) {
 255         TEST_error("Usage error");
 256         return 0;
 257     }
 258     cert = argv[1];
 259     privkey = argv[2];
 260
 261     ADD_ALL_TESTS(test_ssl_corrupt, setup_cipher_list());
 262
 263     ret = run_tests(argv[0]);
 264     bio_f_tls_corrupt_filter_free();
 265     OPENSSL_free(cipher_list);
 266
 267     return ret;
 268 }