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 "../ssl/ssl_locl.h"
47 /* As per https://tools.ietf.org/html/rfc6520#section-4 */
48 #define MIN_PADDING_SIZE 16
50 /* Maximum number of payload characters to print as test output */
51 #define MAX_PRINTABLE_CHARACTERS 1024
53 typedef struct heartbeat_test_fixture
57 const char* test_case_name;
58 int (*process_heartbeat)(SSL* s);
59 unsigned char* payload;
61 int expected_return_value;
62 int return_payload_offset;
63 int expected_payload_len;
64 const char* expected_return_payload;
65 } HEARTBEAT_TEST_FIXTURE;
67 static HEARTBEAT_TEST_FIXTURE set_up(const char* const test_case_name,
68 const SSL_METHOD* meth)
70 HEARTBEAT_TEST_FIXTURE fixture;
71 memset(&fixture, 0, sizeof(fixture));
72 fixture.test_case_name = test_case_name;
74 fixture.ctx = SSL_CTX_new(meth);
77 fprintf(stderr, "Failed to allocate SSL_CTX for test: %s\n",
82 fixture.s = SSL_new(fixture.ctx);
85 fprintf(stderr, "Failed to allocate SSL for test: %s\n", test_case_name);
89 ssl_init_wbio_buffer(fixture.s, 1);
90 ssl3_setup_buffers(fixture.s);
95 ERR_print_errors_fp(stderr);
101 static HEARTBEAT_TEST_FIXTURE set_up_dtls(const char* const test_case_name)
103 HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
104 DTLSv1_server_method());
105 fixture.process_heartbeat = dtls1_process_heartbeat;
107 /* As per dtls1_get_record(), skipping the following from the beginning of
108 * the returned heartbeat message:
109 * type-1 byte; version-2 bytes; sequence number-8 bytes; length-2 bytes
111 * And then skipping the 1-byte type encoded by process_heartbeat for
112 * a total of 14 bytes, at which point we can grab the length and the
115 fixture.return_payload_offset = 14;
119 /* Needed by ssl3_write_bytes() */
120 static int dummy_handshake(SSL* s)
125 static HEARTBEAT_TEST_FIXTURE set_up_tls(const char* const test_case_name)
127 HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
128 TLSv1_server_method());
129 fixture.process_heartbeat = tls1_process_heartbeat;
130 fixture.s->handshake_func = dummy_handshake;
132 /* As per do_ssl3_write(), skipping the following from the beginning of
133 * the returned heartbeat message:
134 * type-1 byte; version-2 bytes; length-2 bytes
136 * And then skipping the 1-byte type encoded by process_heartbeat for
137 * a total of 6 bytes, at which point we can grab the length and the payload
140 fixture.return_payload_offset = 6;
144 static void tear_down(HEARTBEAT_TEST_FIXTURE fixture)
146 ERR_print_errors_fp(stderr);
147 memset(fixture.s, 0, sizeof(*fixture.s));
149 memset(fixture.ctx, 0, sizeof(*fixture.ctx));
150 SSL_CTX_free(fixture.ctx);
153 static void print_payload(const char* const prefix,
154 const unsigned char *payload, const int n)
156 const int end = n < MAX_PRINTABLE_CHARACTERS ? n : MAX_PRINTABLE_CHARACTERS;
157 printf("%s %d character%s", prefix, n, n == 1 ? "" : "s");
158 if (end != n) printf(" (first %d shown)", end);
162 for (; i != end; ++i)
164 const unsigned char c = payload[i];
165 if (isprint(c)) fputc(c, stdout);
166 else printf("\\x%02x", c);
171 static int execute_heartbeat(HEARTBEAT_TEST_FIXTURE fixture)
175 unsigned char *payload = fixture.payload;
176 unsigned char sent_buf[MAX_PRINTABLE_CHARACTERS + 1];
178 s->s3->rrec.data = payload;
179 s->s3->rrec.length = strlen((const char*)payload);
180 *payload++ = TLS1_HB_REQUEST;
181 s2n(fixture.sent_payload_len, payload);
183 /* Make a local copy of the request, since it gets overwritten at some
185 memcpy((char *)sent_buf, (const char*)payload, sizeof(sent_buf));
187 int return_value = fixture.process_heartbeat(s);
189 if (return_value != fixture.expected_return_value)
191 printf("%s failed: expected return value %d, received %d\n",
192 fixture.test_case_name, fixture.expected_return_value,
197 /* If there is any byte alignment, it will be stored in wbuf.offset. */
198 unsigned const char *p = &(s->s3->wbuf.buf[
199 fixture.return_payload_offset + s->s3->wbuf.offset]);
200 int actual_payload_len = 0;
201 n2s(p, actual_payload_len);
203 if (actual_payload_len != fixture.expected_payload_len)
205 printf("%s failed:\n expected payload len: %d\n received: %d\n",
206 fixture.test_case_name, fixture.expected_payload_len,
208 print_payload("sent", sent_buf, strlen((const char*)sent_buf));
209 print_payload("received", p, actual_payload_len);
214 char* actual_payload = strndup((const char*)p, actual_payload_len);
215 if (strcmp(actual_payload, fixture.expected_return_payload) != 0)
217 printf("%s failed:\n expected payload: \"%s\"\n received: \"%s\"\n",
218 fixture.test_case_name, fixture.expected_return_payload,
222 free(actual_payload);
227 printf("** %s failed **\n--------\n", fixture.test_case_name);
232 static int honest_payload_size(unsigned char payload_buf[])
234 /* Omit three-byte pad at the beginning for type and payload length */
235 return strlen((const char*)&payload_buf[3]) - MIN_PADDING_SIZE;
238 #define SETUP_HEARTBEAT_TEST_FIXTURE(type)\
239 HEARTBEAT_TEST_FIXTURE fixture = set_up_##type(__func__);\
242 #define EXECUTE_HEARTBEAT_TEST()\
243 if (execute_heartbeat(fixture) != 0) result = 1;\
247 static int test_dtls1_not_bleeding()
249 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
250 /* Three-byte pad at the beginning for type and payload length */
251 unsigned char payload_buf[] = " Not bleeding, sixteen spaces of padding"
253 const int payload_buf_len = honest_payload_size(payload_buf);
255 fixture.payload = &payload_buf[0];
256 fixture.sent_payload_len = payload_buf_len;
257 fixture.expected_return_value = 0;
258 fixture.expected_payload_len = payload_buf_len;
259 fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";
260 EXECUTE_HEARTBEAT_TEST();
263 static int test_dtls1_not_bleeding_empty_payload()
265 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
266 /* Three-byte pad at the beginning for type and payload length, plus a NUL
268 unsigned char payload_buf[4 + MIN_PADDING_SIZE];
269 memset(payload_buf, ' ', sizeof(payload_buf));
270 payload_buf[sizeof(payload_buf) - 1] = '\0';
271 const int payload_buf_len = honest_payload_size(payload_buf);
273 fixture.payload = &payload_buf[0];
274 fixture.sent_payload_len = payload_buf_len;
275 fixture.expected_return_value = 0;
276 fixture.expected_payload_len = payload_buf_len;
277 fixture.expected_return_payload = "";
278 EXECUTE_HEARTBEAT_TEST();
281 static int test_dtls1_heartbleed()
283 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
284 /* Three-byte pad at the beginning for type and payload length */
285 unsigned char payload_buf[] = " HEARTBLEED ";
287 fixture.payload = &payload_buf[0];
288 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
289 fixture.expected_return_value = 0;
290 fixture.expected_payload_len = 0;
291 fixture.expected_return_payload = "";
292 EXECUTE_HEARTBEAT_TEST();
295 static int test_dtls1_heartbleed_empty_payload()
297 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
298 /* Excluding the NUL at the end, one byte short of type + payload length +
300 unsigned char payload_buf[MIN_PADDING_SIZE + 3];
301 memset(payload_buf, ' ', sizeof(payload_buf));
302 payload_buf[sizeof(payload_buf) - 1] = '\0';
304 fixture.payload = &payload_buf[0];
305 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
306 fixture.expected_return_value = 0;
307 fixture.expected_payload_len = 0;
308 fixture.expected_return_payload = "";
309 EXECUTE_HEARTBEAT_TEST();
312 static int test_dtls1_heartbleed_excessive_plaintext_length()
314 SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
315 /* Excluding the NUL at the end, one byte in excess of maximum allowed
316 * heartbeat message length */
317 unsigned char payload_buf[SSL3_RT_MAX_PLAIN_LENGTH + 2];
318 memset(payload_buf, ' ', sizeof(payload_buf));
319 payload_buf[sizeof(payload_buf) - 1] = '\0';
321 fixture.payload = &payload_buf[0];
322 fixture.sent_payload_len = honest_payload_size(payload_buf);
323 fixture.expected_return_value = 0;
324 fixture.expected_payload_len = 0;
325 fixture.expected_return_payload = "";
326 EXECUTE_HEARTBEAT_TEST();
329 static int test_tls1_not_bleeding()
331 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
332 /* Three-byte pad at the beginning for type and payload length */
333 unsigned char payload_buf[] = " Not bleeding, sixteen spaces of padding"
335 const int payload_buf_len = honest_payload_size(payload_buf);
337 fixture.payload = &payload_buf[0];
338 fixture.sent_payload_len = payload_buf_len;
339 fixture.expected_return_value = 0;
340 fixture.expected_payload_len = payload_buf_len;
341 fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";
342 EXECUTE_HEARTBEAT_TEST();
345 static int test_tls1_not_bleeding_empty_payload()
347 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
348 /* Three-byte pad at the beginning for type and payload length, plus a NUL
350 unsigned char payload_buf[4 + MIN_PADDING_SIZE];
351 memset(payload_buf, ' ', sizeof(payload_buf));
352 payload_buf[sizeof(payload_buf) - 1] = '\0';
353 const int payload_buf_len = honest_payload_size(payload_buf);
355 fixture.payload = &payload_buf[0];
356 fixture.sent_payload_len = payload_buf_len;
357 fixture.expected_return_value = 0;
358 fixture.expected_payload_len = payload_buf_len;
359 fixture.expected_return_payload = "";
360 EXECUTE_HEARTBEAT_TEST();
363 static int test_tls1_heartbleed()
365 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
366 /* Three-byte pad at the beginning for type and payload length */
367 unsigned char payload_buf[] = " HEARTBLEED ";
369 fixture.payload = &payload_buf[0];
370 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
371 fixture.expected_return_value = 0;
372 fixture.expected_payload_len = 0;
373 fixture.expected_return_payload = "";
374 EXECUTE_HEARTBEAT_TEST();
377 static int test_tls1_heartbleed_empty_payload()
379 SETUP_HEARTBEAT_TEST_FIXTURE(tls);
380 /* Excluding the NUL at the end, one byte short of type + payload length +
382 unsigned char payload_buf[MIN_PADDING_SIZE + 3];
383 memset(payload_buf, ' ', sizeof(payload_buf));
384 payload_buf[sizeof(payload_buf) - 1] = '\0';
386 fixture.payload = &payload_buf[0];
387 fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
388 fixture.expected_return_value = 0;
389 fixture.expected_payload_len = 0;
390 fixture.expected_return_payload = "";
391 EXECUTE_HEARTBEAT_TEST();
394 #undef EXECUTE_HEARTBEAT_TEST
395 #undef SETUP_HEARTBEAT_TEST_FIXTURE
397 int main(int argc, char *argv[])
400 SSL_load_error_strings();
402 const int num_failed = test_dtls1_not_bleeding() +
403 test_dtls1_not_bleeding_empty_payload() +
404 test_dtls1_heartbleed() +
405 test_dtls1_heartbleed_empty_payload() +
406 /* The following test causes an assertion failure at
407 * ssl/d1_pkt.c:dtls1_write_bytes() in versions prior to 1.0.1g: */
408 (OPENSSL_VERSION_NUMBER >= 0x1000107fL ?
409 test_dtls1_heartbleed_excessive_plaintext_length() : 0) +
410 test_tls1_not_bleeding() +
411 test_tls1_not_bleeding_empty_payload() +
412 test_tls1_heartbleed() +
413 test_tls1_heartbleed_empty_payload() +
416 ERR_print_errors_fp(stderr);
420 printf("%d test%s failed\n", num_failed, num_failed != 1 ? "s" : "");