1 /* test/heartbeat_test.c */
3 * Unit test for TLS heartbeats.
5 * Acts as a regression test against the Heartbleed bug (CVE-2014-0160).
7 * Author: Mike Bland (mbland@acm.org, http://mike-bland.com/)
9 * License: Creative Commons Attribution 4.0 International (CC By 4.0)
10 * http://creativecommons.org/licenses/by/4.0/deed.en_US
14 * The program returns zero on success. It will print a message with a count
15 * of the number of failed tests and return nonzero if any tests fail.
17 * It will print the contents of the request and response buffers for each
18 * failing test. In a "fixed" version, all the tests should pass and there
19 * should be no output.
21 * In a "bleeding" version, you'll see:
23 * test_dtls1_heartbleed failed:
24 * expected payload len: 0
28 * received 1024 characters
29 * "HEARTBLEED \xde\xad\xbe\xef..."
30 * ** test_dtls1_heartbleed failed **
32 * The contents of the returned buffer in the failing test will depend on the
33 * contents of memory on your machine.
37 * http://mike-bland.com/2014/04/12/heartbleed.html
38 * http://mike-bland.com/tags/heartbleed.html
41 #include "../test/testutil.h"
42 #include "../ssl/ssl_locl.h"
48 #if !defined(OPENSSL_NO_HEARTBEATS) && !defined(OPENSSL_SYS_WINDOWS)
50 /* As per https://tools.ietf.org/html/rfc6520#section-4 */
51 #define MIN_PADDING_SIZE 16
53 /* Maximum number of payload characters to print as test output */
54 #define MAX_PRINTABLE_CHARACTERS 1024
56 typedef struct heartbeat_test_fixture
60 const char* test_case_name;
61 int (*process_heartbeat)(SSL* s);
62 unsigned char* payload;
64 int expected_return_value;
65 int return_payload_offset;
66 int expected_payload_len;
67 const char* expected_return_payload;
68 } HEARTBEAT_TEST_FIXTURE;
70 static HEARTBEAT_TEST_FIXTURE set_up(const char* const test_case_name,
71 const SSL_METHOD* meth)
73 HEARTBEAT_TEST_FIXTURE fixture;
75 memset(&fixture, 0, sizeof(fixture));
76 fixture.test_case_name = test_case_name;
78 fixture.ctx = SSL_CTX_new(meth);
81 fprintf(stderr, "Failed to allocate SSL_CTX for test: %s\n",
87 fixture.s = SSL_new(fixture.ctx);
90 fprintf(stderr, "Failed to allocate SSL for test: %s\n", test_case_name);
95 if (!ssl_init_wbio_buffer(fixture.s, 1))
97 fprintf(stderr, "Failed to set up wbio buffer for test: %s\n",
103 if (!ssl3_setup_buffers(fixture.s))
105 fprintf(stderr, "Failed to setup buffers for test: %s\n",
111 /* Clear the memory for the return buffer, since this isn't automatically
112 * zeroed in opt mode and will cause spurious test failures that will change
113 * with each execution.
115 memset(fixture.s->s3->wbuf.buf, 0, fixture.s->s3->wbuf.len);
120 ERR_print_errors_fp(stderr);
126 static HEARTBEAT_TEST_FIXTURE set_up_dtls(const char* const test_case_name)
128 HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
129 DTLSv1_server_method());
130 fixture.process_heartbeat = dtls1_process_heartbeat;
132 /* As per dtls1_get_record(), skipping the following from the beginning of
133 * the returned heartbeat message:
134 * type-1 byte; version-2 bytes; sequence number-8 bytes; length-2 bytes
136 * And then skipping the 1-byte type encoded by process_heartbeat for
137 * a total of 14 bytes, at which point we can grab the length and the
140 fixture.return_payload_offset = 14;
144 /* Needed by ssl3_write_bytes() */
145 static int dummy_handshake(SSL* s)
150 static HEARTBEAT_TEST_FIXTURE set_up_tls(const char* const test_case_name)
152 HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
153 TLSv1_server_method());
154 fixture.process_heartbeat = tls1_process_heartbeat;
155 fixture.s->handshake_func = dummy_handshake;
157 /* As per do_ssl3_write(), skipping the following from the beginning of
158 * the returned heartbeat message:
159 * type-1 byte; version-2 bytes; length-2 bytes
161 * And then skipping the 1-byte type encoded by process_heartbeat for
162 * a total of 6 bytes, at which point we can grab the length and the payload
165 fixture.return_payload_offset = 6;
169 static void tear_down(HEARTBEAT_TEST_FIXTURE fixture)
171 ERR_print_errors_fp(stderr);
173 SSL_CTX_free(fixture.ctx);
176 static void print_payload(const char* const prefix,
177 const unsigned char *payload, const int n)
179 const int end = n < MAX_PRINTABLE_CHARACTERS ? n
180 : MAX_PRINTABLE_CHARACTERS;
183 printf("%s %d character%s", prefix, n, n == 1 ? "" : "s");
184 if (end != n) printf(" (first %d shown)", end);
187 for (; i != end; ++i)
189 const unsigned char c = payload[i];
190 if (isprint(c)) fputc(c, stdout);
191 else printf("\\x%02x", c);
196 static int execute_heartbeat(HEARTBEAT_TEST_FIXTURE fixture)
200 unsigned char *payload = fixture.payload;
201 unsigned char sent_buf[MAX_PRINTABLE_CHARACTERS + 1];
203 unsigned const char *p;
204 int actual_payload_len;
206 s->s3->rrec.data = payload;
207 s->s3->rrec.length = strlen((const char*)payload);
208 *payload++ = TLS1_HB_REQUEST;
209 s2n(fixture.sent_payload_len, payload);
211 /* Make a local copy of the request, since it gets overwritten at some
213 memcpy((char *)sent_buf, (const char*)payload, sizeof(sent_buf));
215 return_value = fixture.process_heartbeat(s);
217 if (return_value != fixture.expected_return_value)
219 printf("%s failed: expected return value %d, received %d\n",
220 fixture.test_case_name, fixture.expected_return_value,
225 /* If there is any byte alignment, it will be stored in wbuf.offset. */
226 p = &(s->s3->wbuf.buf[
227 fixture.return_payload_offset + s->s3->wbuf.offset]);
228 actual_payload_len = 0;
229 n2s(p, actual_payload_len);
231 if (actual_payload_len != fixture.expected_payload_len)
233 printf("%s failed:\n expected payload len: %d\n received: %d\n",
234 fixture.test_case_name, fixture.expected_payload_len,
236 print_payload("sent", sent_buf, strlen((const char*)sent_buf));
237 print_payload("received", p, actual_payload_len);
242 char* actual_payload = BUF_strndup((const char*)p, actual_payload_len);
243 if (strcmp(actual_payload, fixture.expected_return_payload) != 0)
245 printf("%s failed:\n expected payload: \"%s\"\n received: \"%s\"\n",
246 fixture.test_case_name, fixture.expected_return_payload,
250 OPENSSL_free(actual_payload);
255 printf("** %s failed **\n--------\n", fixture.test_case_name);
260 static int honest_payload_size(unsigned char payload_buf[])
262 /* Omit three-byte pad at the beginning for type and payload length */
263 return strlen((const char*)&payload_buf[3]) - MIN_PADDING_SIZE;
266 #define SETUP_HEARTBEAT_TEST_FIXTURE(type)\
267 SETUP_TEST_FIXTURE(HEARTBEAT_TEST_FIXTURE, set_up_##type)
269 #define EXECUTE_HEARTBEAT_TEST()\
270 EXECUTE_TEST(execute_heartbeat, tear_down)
272 static int test_dtls1_not_bleeding()
274 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
275 /* Three-byte pad at the beginning for type and payload length */
276 unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS+4] =
277 " Not bleeding, sixteen spaces of padding"
279 const int payload_buf_len = honest_payload_size(payload_buf);
281 fixture.payload = &payload_buf[0];
282 fixture.sent_payload_len = payload_buf_len;
283 fixture.expected_return_value = 0;
284 fixture.expected_payload_len = payload_buf_len;
285 fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";
286 EXECUTE_HEARTBEAT_TEST();
289 static int test_dtls1_not_bleeding_empty_payload()
293 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
294 /* Three-byte pad at the beginning for type and payload length, plus a NUL
296 unsigned char payload_buf[4 + MAX_PRINTABLE_CHARACTERS];
297 memset(payload_buf, ' ', MIN_PADDING_SIZE+3);
298 payload_buf[MIN_PADDING_SIZE+3] = '\0';
299 payload_buf_len = honest_payload_size(payload_buf);
301 fixture.payload = &payload_buf[0];
302 fixture.sent_payload_len = payload_buf_len;
303 fixture.expected_return_value = 0;
304 fixture.expected_payload_len = payload_buf_len;
305 fixture.expected_return_payload = "";
306 EXECUTE_HEARTBEAT_TEST();
309 static int test_dtls1_heartbleed()
311 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
312 /* Three-byte pad at the beginning for type and payload length */
313 unsigned char payload_buf[4+MAX_PRINTABLE_CHARACTERS] =
316 fixture.payload = &payload_buf[0];
317 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
318 fixture.expected_return_value = 0;
319 fixture.expected_payload_len = 0;
320 fixture.expected_return_payload = "";
321 EXECUTE_HEARTBEAT_TEST();
324 static int test_dtls1_heartbleed_empty_payload()
326 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
327 /* Excluding the NUL at the end, one byte short of type + payload length +
329 unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4];
330 memset(payload_buf, ' ', MIN_PADDING_SIZE+2);
331 payload_buf[MIN_PADDING_SIZE+2] = '\0';
333 fixture.payload = &payload_buf[0];
334 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
335 fixture.expected_return_value = 0;
336 fixture.expected_payload_len = 0;
337 fixture.expected_return_payload = "";
338 EXECUTE_HEARTBEAT_TEST();
341 static int test_dtls1_heartbleed_excessive_plaintext_length()
343 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
344 /* Excluding the NUL at the end, one byte in excess of maximum allowed
345 * heartbeat message length */
346 unsigned char payload_buf[SSL3_RT_MAX_PLAIN_LENGTH + 2];
347 memset(payload_buf, ' ', sizeof(payload_buf));
348 payload_buf[sizeof(payload_buf) - 1] = '\0';
350 fixture.payload = &payload_buf[0];
351 fixture.sent_payload_len = honest_payload_size(payload_buf);
352 fixture.expected_return_value = 0;
353 fixture.expected_payload_len = 0;
354 fixture.expected_return_payload = "";
355 EXECUTE_HEARTBEAT_TEST();
358 static int test_tls1_not_bleeding()
360 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
361 /* Three-byte pad at the beginning for type and payload length */
362 unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS+4] =
363 " Not bleeding, sixteen spaces of padding"
365 const int payload_buf_len = honest_payload_size(payload_buf);
367 fixture.payload = &payload_buf[0];
368 fixture.sent_payload_len = payload_buf_len;
369 fixture.expected_return_value = 0;
370 fixture.expected_payload_len = payload_buf_len;
371 fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";
372 EXECUTE_HEARTBEAT_TEST();
375 static int test_tls1_not_bleeding_empty_payload()
379 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
380 /* Three-byte pad at the beginning for type and payload length, plus a NUL
382 unsigned char payload_buf[4 + MAX_PRINTABLE_CHARACTERS];
383 memset(payload_buf, ' ', MIN_PADDING_SIZE+3);
384 payload_buf[MIN_PADDING_SIZE+3] = '\0';
385 payload_buf_len = honest_payload_size(payload_buf);
387 fixture.payload = &payload_buf[0];
388 fixture.sent_payload_len = payload_buf_len;
389 fixture.expected_return_value = 0;
390 fixture.expected_payload_len = payload_buf_len;
391 fixture.expected_return_payload = "";
392 EXECUTE_HEARTBEAT_TEST();
395 static int test_tls1_heartbleed()
397 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
398 /* Three-byte pad at the beginning for type and payload length */
399 unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS+4] =
402 fixture.payload = &payload_buf[0];
403 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
404 fixture.expected_return_value = 0;
405 fixture.expected_payload_len = 0;
406 fixture.expected_return_payload = "";
407 EXECUTE_HEARTBEAT_TEST();
410 static int test_tls1_heartbleed_empty_payload()
412 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
413 /* Excluding the NUL at the end, one byte short of type + payload length +
415 unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4];
416 memset(payload_buf, ' ', MIN_PADDING_SIZE+2);
417 payload_buf[MIN_PADDING_SIZE+2] = '\0';
419 fixture.payload = &payload_buf[0];
420 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
421 fixture.expected_return_value = 0;
422 fixture.expected_payload_len = 0;
423 fixture.expected_return_payload = "";
424 EXECUTE_HEARTBEAT_TEST();
427 #undef EXECUTE_HEARTBEAT_TEST
428 #undef SETUP_HEARTBEAT_TEST_FIXTURE
430 int main(int argc, char *argv[])
435 SSL_load_error_strings();
437 num_failed = test_dtls1_not_bleeding() +
438 test_dtls1_not_bleeding_empty_payload() +
439 test_dtls1_heartbleed() +
440 test_dtls1_heartbleed_empty_payload() +
441 /* The following test causes an assertion failure at
442 * ssl/d1_pkt.c:dtls1_write_bytes() in versions prior to 1.0.1g: */
443 (OPENSSL_VERSION_NUMBER >= 0x1000107fL ?
444 test_dtls1_heartbleed_excessive_plaintext_length() : 0) +
445 test_tls1_not_bleeding() +
446 test_tls1_not_bleeding_empty_payload() +
447 test_tls1_heartbleed() +
448 test_tls1_heartbleed_empty_payload() +
451 ERR_print_errors_fp(stderr);
455 printf("%d test%s failed\n", num_failed, num_failed != 1 ? "s" : "");
461 #else /* OPENSSL_NO_HEARTBEATS*/
463 int main(int argc, char *argv[])
467 #endif /* OPENSSL_NO_HEARTBEATS */