Commit ab0d9642 authored by Mike Bland's avatar Mike Bland Committed by Ben Laurie
Browse files

Unit/regression test for TLS heartbeats. 

Regression test against CVE-2014-0160 (Heartbleed).

More info: http://mike-bland.com/tags/heartbleed.html

(based on commit 35cb55988b75573105eefd00d27d0138eebe40b1)
parent dac3654e

ssl/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ KRB5_INCLUDES= 
CFLAGS= $(INCLUDES) $(CFLAG)



GENERAL=Makefile README ssl-lib.com install.com

TEST=ssltest.c

TEST=ssltest.c heartbeat_test.c

APPS=



LIB=$(TOP)/libssl.a

ssl/heartbeat_test.c

0 → 100644
+455 −0
Original line number Diff line number Diff line 
/* test/heartbeat_test.c */

/*

 * Unit test for TLS heartbeats.

 *

 * Acts as a regression test against the Heartbleed bug (CVE-2014-0160).

 *

 * Author:  Mike Bland (mbland@acm.org, http://mike-bland.com/)

 * Date:    2014-04-12

 * License: Creative Commons Attribution 4.0 International (CC By 4.0)

 *          http://creativecommons.org/licenses/by/4.0/deed.en_US

 *

 * OUTPUT

 * ------

 * The program returns zero on success. It will print a message with a count

 * of the number of failed tests and return nonzero if any tests fail.

 *

 * It will print the contents of the request and response buffers for each

 * failing test. In a "fixed" version, all the tests should pass and there

 * should be no output.

 *

 * In a "bleeding" version, you'll see:

 *

 *   test_dtls1_heartbleed failed:

 *     expected payload len: 0

 *     received: 1024

 *   sent 26 characters

 *     "HEARTBLEED                "

 *   received 1024 characters

 *     "HEARTBLEED                \xde\xad\xbe\xef..."

 *   ** test_dtls1_heartbleed failed **

 *

 * The contents of the returned buffer in the failing test will depend on the

 * contents of memory on your machine.

 *

 * MORE INFORMATION

 * ----------------

 * http://mike-bland.com/2014/04/12/heartbleed.html

 * http://mike-bland.com/tags/heartbleed.html

 */



#include "../ssl/ssl_locl.h"

#include <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



/* As per https://tools.ietf.org/html/rfc6520#section-4 */

#define MIN_PADDING_SIZE	16



/* Maximum number of payload characters to print as test output */

#define MAX_PRINTABLE_CHARACTERS	1024



typedef struct heartbeat_test_fixture

	{

	SSL_CTX *ctx;

	SSL *s;

	const char* test_case_name;

	int (*process_heartbeat)(SSL* s);

	unsigned char* payload;

	int sent_payload_len;

	int expected_return_value;

	int return_payload_offset;

	int expected_payload_len;

	const char* expected_return_payload;

	} HEARTBEAT_TEST_FIXTURE;



static HEARTBEAT_TEST_FIXTURE set_up(const char* const test_case_name,

	const SSL_METHOD* meth)

	{

	HEARTBEAT_TEST_FIXTURE fixture;

	int setup_ok = 1;

	memset(&fixture, 0, sizeof(fixture));

	fixture.test_case_name = test_case_name;



	fixture.ctx = SSL_CTX_new(meth);

	if (!fixture.ctx)

		{

		fprintf(stderr, "Failed to allocate SSL_CTX for test: %s\n",

			test_case_name);

		setup_ok = 0;

		goto fail;

		}



	fixture.s = SSL_new(fixture.ctx);

	if (!fixture.s)

		{

		fprintf(stderr, "Failed to allocate SSL for test: %s\n", test_case_name);

		setup_ok = 0;

		goto fail;

		}



	if (!ssl_init_wbio_buffer(fixture.s, 1))

		{

		fprintf(stderr, "Failed to set up wbio buffer for test: %s\n",

			test_case_name);

		setup_ok = 0;

		goto fail;

		}



	if (!ssl3_setup_buffers(fixture.s))

		{

		fprintf(stderr, "Failed to setup buffers for test: %s\n",

			test_case_name);

		setup_ok = 0;

		goto fail;

		}



	/* Clear the memory for the return buffer, since this isn't automatically

	 * zeroed in opt mode and will cause spurious test failures that will change

	 * with each execution.

	 */

	memset(fixture.s->s3->wbuf.buf, 0, fixture.s->s3->wbuf.len);



	fail:

	if (!setup_ok)

		{

		ERR_print_errors_fp(stderr);

		exit(EXIT_FAILURE);

		}

	return fixture;

	}



static HEARTBEAT_TEST_FIXTURE set_up_dtls(const char* const test_case_name)

	{

	HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,

		DTLSv1_server_method());

	fixture.process_heartbeat = dtls1_process_heartbeat;



	/* As per dtls1_get_record(), skipping the following from the beginning of

	 * the returned heartbeat message:

	 * type-1 byte; version-2 bytes; sequence number-8 bytes; length-2 bytes

	 *

	 * And then skipping the 1-byte type encoded by process_heartbeat for

	 * a total of 14 bytes, at which point we can grab the length and the

	 * payload we seek.

	 */

	fixture.return_payload_offset = 14;

	return fixture;

	}



/* Needed by ssl3_write_bytes() */

static int dummy_handshake(SSL* s)

	{

	return 1;

	}



static HEARTBEAT_TEST_FIXTURE set_up_tls(const char* const test_case_name)

	{

	HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,

		TLSv1_server_method());

	fixture.process_heartbeat = tls1_process_heartbeat;

	fixture.s->handshake_func = dummy_handshake;



	/* As per do_ssl3_write(), skipping the following from the beginning of

	 * the returned heartbeat message:

	 * type-1 byte; version-2 bytes; length-2 bytes

	 *

	 * And then skipping the 1-byte type encoded by process_heartbeat for

	 * a total of 6 bytes, at which point we can grab the length and the payload

	 * we seek.

	 */

	fixture.return_payload_offset = 6;

	return fixture;

	}



static void tear_down(HEARTBEAT_TEST_FIXTURE fixture)

	{

	ERR_print_errors_fp(stderr);

	SSL_free(fixture.s);

	SSL_CTX_free(fixture.ctx);

	}



static void print_payload(const char* const prefix,

		const unsigned char *payload, const int n)

	{

	const int end = n < MAX_PRINTABLE_CHARACTERS ? n

	    : MAX_PRINTABLE_CHARACTERS;

	int i = 0;



	printf("%s %d character%s", prefix, n, n == 1 ? "" : "s");

	if (end != n) printf(" (first %d shown)", end);

	printf("\n  \"");



	for (; i != end; ++i)

		{

		const unsigned char c = payload[i];

		if (isprint(c)) fputc(c, stdout);

		else printf("\\x%02x", c);

		}

	printf("\"\n");

	}



static int execute_heartbeat(HEARTBEAT_TEST_FIXTURE fixture)

	{

	int result = 0;

	SSL* s = fixture.s;

	unsigned char *payload = fixture.payload;

	unsigned char sent_buf[MAX_PRINTABLE_CHARACTERS + 1];

	int return_value;

	unsigned const char *p;

	int actual_payload_len;



	s->s3->rrec.data = payload;

	s->s3->rrec.length = strlen((const char*)payload);

	*payload++ = TLS1_HB_REQUEST;

	s2n(fixture.sent_payload_len, payload);



	/* Make a local copy of the request, since it gets overwritten at some

	 * point */

	memcpy((char *)sent_buf, (const char*)payload, sizeof(sent_buf));



	return_value = fixture.process_heartbeat(s);



	if (return_value != fixture.expected_return_value)

		{

		printf("%s failed: expected return value %d, received %d\n",

					 fixture.test_case_name, fixture.expected_return_value,

					 return_value);

		result = 1;

		}



	/* If there is any byte alignment, it will be stored in wbuf.offset. */

	p = &(s->s3->wbuf.buf[

			fixture.return_payload_offset + s->s3->wbuf.offset]);

	actual_payload_len = 0;

	n2s(p, actual_payload_len);



	if (actual_payload_len != fixture.expected_payload_len)

		{

		printf("%s failed:\n  expected payload len: %d\n  received: %d\n",

					 fixture.test_case_name, fixture.expected_payload_len,

					 actual_payload_len);

		print_payload("sent", sent_buf, strlen((const char*)sent_buf));

		print_payload("received", p, actual_payload_len);

		result = 1;

		}

	else

		{

		char* actual_payload = strndup((const char*)p, actual_payload_len);

		if (strcmp(actual_payload, fixture.expected_return_payload) != 0)

			{

			printf("%s failed:\n  expected payload: \"%s\"\n  received: \"%s\"\n",

						 fixture.test_case_name, fixture.expected_return_payload,

						 actual_payload);

			result = 1;

			}

		free(actual_payload);

		}



	if (result != 0)

		{

		printf("** %s failed **\n--------\n", fixture.test_case_name);

		}

	return result;

	}



static int honest_payload_size(unsigned char payload_buf[])

	{

	/* Omit three-byte pad at the beginning for type and payload length */

	return strlen((const char*)&payload_buf[3]) - MIN_PADDING_SIZE;

	}



#define SETUP_HEARTBEAT_TEST_FIXTURE(type)\

	HEARTBEAT_TEST_FIXTURE fixture = set_up_##type(__func__);\

	int result = 0



#define EXECUTE_HEARTBEAT_TEST()\

	if (execute_heartbeat(fixture) != 0) result = 1;\

	tear_down(fixture);\

	return result



static int test_dtls1_not_bleeding()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(dtls);

	/* Three-byte pad at the beginning for type and payload length */

	unsigned char payload_buf[] = "   Not bleeding, sixteen spaces of padding"

		"                ";

	const int payload_buf_len = honest_payload_size(payload_buf);



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = payload_buf_len;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = payload_buf_len;

	fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_dtls1_not_bleeding_empty_payload()

	{

	int payload_buf_len;



	SETUP_HEARTBEAT_TEST_FIXTURE(dtls);

	/* Three-byte pad at the beginning for type and payload length, plus a NUL

	 * at the end */

	unsigned char payload_buf[4 + MIN_PADDING_SIZE];

	memset(payload_buf, ' ', sizeof(payload_buf));

	payload_buf[sizeof(payload_buf) - 1] = '\0';

	payload_buf_len = honest_payload_size(payload_buf);



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = payload_buf_len;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = payload_buf_len;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_dtls1_heartbleed()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(dtls);

	/* Three-byte pad at the beginning for type and payload length */

	unsigned char payload_buf[] = "   HEARTBLEED                ";



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = 0;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_dtls1_heartbleed_empty_payload()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(dtls);

	/* Excluding the NUL at the end, one byte short of type + payload length +

	 * minimum padding */

	unsigned char payload_buf[MIN_PADDING_SIZE + 3];

	memset(payload_buf, ' ', sizeof(payload_buf));

	payload_buf[sizeof(payload_buf) - 1] = '\0';



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = 0;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_dtls1_heartbleed_excessive_plaintext_length()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(dtls);

	/* Excluding the NUL at the end, one byte in excess of maximum allowed

	 * heartbeat message length */

	unsigned char payload_buf[SSL3_RT_MAX_PLAIN_LENGTH + 2];

	memset(payload_buf, ' ', sizeof(payload_buf));

	payload_buf[sizeof(payload_buf) - 1] = '\0';



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = honest_payload_size(payload_buf);

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = 0;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_tls1_not_bleeding()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(tls);

	/* Three-byte pad at the beginning for type and payload length */

	unsigned char payload_buf[] = "   Not bleeding, sixteen spaces of padding"

					"                ";

	const int payload_buf_len = honest_payload_size(payload_buf);



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = payload_buf_len;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = payload_buf_len;

	fixture.expected_return_payload = "Not bleeding, sixteen spaces of padding";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_tls1_not_bleeding_empty_payload()

	{

	int payload_buf_len;



	SETUP_HEARTBEAT_TEST_FIXTURE(tls);

	/* Three-byte pad at the beginning for type and payload length, plus a NUL

	 * at the end */

	unsigned char payload_buf[4 + MIN_PADDING_SIZE];

	memset(payload_buf, ' ', sizeof(payload_buf));

	payload_buf[sizeof(payload_buf) - 1] = '\0';

	payload_buf_len = honest_payload_size(payload_buf);



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = payload_buf_len;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = payload_buf_len;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_tls1_heartbleed()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(tls);

	/* Three-byte pad at the beginning for type and payload length */

	unsigned char payload_buf[] = "   HEARTBLEED                ";



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = 0;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



static int test_tls1_heartbleed_empty_payload()

	{

	SETUP_HEARTBEAT_TEST_FIXTURE(tls);

	/* Excluding the NUL at the end, one byte short of type + payload length +

	 * minimum padding */

	unsigned char payload_buf[MIN_PADDING_SIZE + 3];

	memset(payload_buf, ' ', sizeof(payload_buf));

	payload_buf[sizeof(payload_buf) - 1] = '\0';



	fixture.payload = &payload_buf[0];

	fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;

	fixture.expected_return_value = 0;

	fixture.expected_payload_len = 0;

	fixture.expected_return_payload = "";

	EXECUTE_HEARTBEAT_TEST();

	}



#undef EXECUTE_HEARTBEAT_TEST

#undef SETUP_HEARTBEAT_TEST_FIXTURE



int main(int argc, char *argv[])

	{

	int num_failed;



	SSL_library_init();

	SSL_load_error_strings();



	num_failed = test_dtls1_not_bleeding() +

	    test_dtls1_not_bleeding_empty_payload() +

	    test_dtls1_heartbleed() +

	    test_dtls1_heartbleed_empty_payload() +

	    /* The following test causes an assertion failure at

	     * ssl/d1_pkt.c:dtls1_write_bytes() in versions prior to 1.0.1g: */

	    (OPENSSL_VERSION_NUMBER >= 0x1000107fL ?

	     test_dtls1_heartbleed_excessive_plaintext_length() : 0) +

	    test_tls1_not_bleeding() +

	    test_tls1_not_bleeding_empty_payload() +

	    test_tls1_heartbleed() +

	    test_tls1_heartbleed_empty_payload() +

	    0;



	ERR_print_errors_fp(stderr);



	if (num_failed != 0)

		{

		printf("%d test%s failed\n", num_failed, num_failed != 1 ? "s" : "");

		return EXIT_FAILURE;

		}

	return EXIT_SUCCESS;

	}

test/Makefile

+34 −4
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ IGETEST= igetest 
JPAKETEST=	jpaketest

SRPTEST=	srptest

ASN1TEST=	asn1test

HEARTBEATTEST= heartbeat_test



TESTS=		alltests
@@ -74,7 +75,7 @@ EXE= $(BNTEST)$(EXE_EXT) $(ECTEST)$(EXE_EXT) $(ECDSATEST)$(EXE_EXT) $(ECDHTEST) 
	$(RANDTEST)$(EXE_EXT) $(DHTEST)$(EXE_EXT) $(ENGINETEST)$(EXE_EXT) \

	$(BFTEST)$(EXE_EXT) $(CASTTEST)$(EXE_EXT) $(SSLTEST)$(EXE_EXT) $(EXPTEST)$(EXE_EXT) $(DSATEST)$(EXE_EXT) $(RSATEST)$(EXE_EXT) \

	$(EVPTEST)$(EXE_EXT) $(IGETEST)$(EXE_EXT) $(JPAKETEST)$(EXE_EXT) $(SRPTEST)$(EXE_EXT) \

	$(ASN1TEST)$(EXE_EXT)

	$(ASN1TEST)$(EXE_EXT) $(HEARTBEATTEST)$(EXE_EXT)



# $(METHTEST)$(EXE_EXT)
@@ -86,7 +87,8 @@ OBJ= $(BNTEST).o $(ECTEST).o $(ECDSATEST).o $(ECDHTEST).o $(IDEATEST).o \ 
	$(MDC2TEST).o $(RMDTEST).o \

	$(RANDTEST).o $(DHTEST).o $(ENGINETEST).o $(CASTTEST).o \

	$(BFTEST).o  $(SSLTEST).o  $(DSATEST).o  $(EXPTEST).o $(RSATEST).o \

	$(EVPTEST).o $(IGETEST).o $(JPAKETEST).o $(ASN1TEST).o

	$(EVPTEST).o $(IGETEST).o $(JPAKETEST).o $(ASN1TEST).o $(HEARTBEATTEST).o



SRC=	$(BNTEST).c $(ECTEST).c  $(ECDSATEST).c $(ECDHTEST).c $(IDEATEST).c \

	$(MD2TEST).c  $(MD4TEST).c $(MD5TEST).c \

	$(HMACTEST).c $(WPTEST).c \
@@ -94,7 +96,8 @@ SRC= $(BNTEST).c $(ECTEST).c $(ECDSATEST).c $(ECDHTEST).c $(IDEATEST).c \ 
	$(DESTEST).c $(SHATEST).c $(SHA1TEST).c $(MDC2TEST).c $(RMDTEST).c \

	$(RANDTEST).c $(DHTEST).c $(ENGINETEST).c $(CASTTEST).c \

	$(BFTEST).c  $(SSLTEST).c $(DSATEST).c   $(EXPTEST).c $(RSATEST).c \

	$(EVPTEST).c $(IGETEST).c $(JPAKETEST).c $(SRPTEST).c $(ASN1TEST).c

	$(EVPTEST).c $(IGETEST).c $(JPAKETEST).c $(SRPTEST).c $(ASN1TEST).c \

	$(HEARTBEATTEST).c



EXHEADER= 

HEADER=	$(EXHEADER)
@@ -137,7 +140,7 @@ alltests: \ 
	test_enc test_x509 test_rsa test_crl test_sid \

	test_gen test_req test_pkcs7 test_verify test_dh test_dsa \

	test_ss test_ca test_engine test_evp test_ssl test_tsa test_ige \

	test_jpake test_srp test_cms

	test_jpake test_srp test_cms test_heartbeat



test_evp:

	../util/shlib_wrap.sh ./$(EVPTEST) evptests.txt
@@ -318,6 +321,9 @@ test_srp: $(SRPTEST)$(EXE_EXT) 
	@echo "Test SRP"

	../util/shlib_wrap.sh ./srptest



test_heartbeat: $(HEARTBEATTEST)$(EXE_EXT)

	../util/shlib_wrap.sh ./$(HEARTBEATTEST)



lint:

	lint -DLINT $(INCLUDES) $(SRC)>fluff
@@ -469,6 +475,9 @@ $(ASN1TEST)$(EXE_EXT): $(ASN1TEST).o $(DLIBCRYPTO) 
$(SRPTEST)$(EXE_EXT): $(SRPTEST).o $(DLIBCRYPTO)

	@target=$(SRPTEST); $(BUILD_CMD)



$(HEARTBEATTEST)$(EXE_EXT): $(HEARTBEATTEST).o $(DLIBCRYPTO)

	@target=$(HEARTBEATTEST); $(BUILD_CMD)



#$(AESTEST).o: $(AESTEST).c

#	$(CC) -c $(CFLAGS) -DINTERMEDIATE_VALUE_KAT -DTRACE_KAT_MCT $(AESTEST).c
@@ -604,6 +613,27 @@ exptest.o: ../include/openssl/opensslconf.h ../include/openssl/opensslv.h 
exptest.o: ../include/openssl/ossl_typ.h ../include/openssl/rand.h

exptest.o: ../include/openssl/safestack.h ../include/openssl/stack.h

exptest.o: ../include/openssl/symhacks.h exptest.c

heartbeat_test.o: ../e_os.h ../include/openssl/asn1.h ../include/openssl/bio.h

heartbeat_test.o: ../include/openssl/buffer.h ../include/openssl/comp.h

heartbeat_test.o: ../include/openssl/crypto.h ../include/openssl/dsa.h

heartbeat_test.o: ../include/openssl/dtls1.h ../include/openssl/e_os2.h

heartbeat_test.o: ../include/openssl/ec.h ../include/openssl/ecdh.h

heartbeat_test.o: ../include/openssl/ecdsa.h ../include/openssl/err.h

heartbeat_test.o: ../include/openssl/evp.h ../include/openssl/hmac.h

heartbeat_test.o: ../include/openssl/kssl.h ../include/openssl/lhash.h

heartbeat_test.o: ../include/openssl/obj_mac.h ../include/openssl/objects.h

heartbeat_test.o: ../include/openssl/opensslconf.h

heartbeat_test.o: ../include/openssl/opensslv.h ../include/openssl/ossl_typ.h

heartbeat_test.o: ../include/openssl/pem.h ../include/openssl/pem2.h

heartbeat_test.o: ../include/openssl/pkcs7.h ../include/openssl/pqueue.h

heartbeat_test.o: ../include/openssl/rsa.h ../include/openssl/safestack.h

heartbeat_test.o: ../include/openssl/sha.h ../include/openssl/srtp.h

heartbeat_test.o: ../include/openssl/ssl.h ../include/openssl/ssl2.h

heartbeat_test.o: ../include/openssl/ssl23.h ../include/openssl/ssl3.h

heartbeat_test.o: ../include/openssl/stack.h ../include/openssl/symhacks.h

heartbeat_test.o: ../include/openssl/tls1.h ../include/openssl/x509.h

heartbeat_test.o: ../include/openssl/x509_vfy.h ../ssl/ssl_locl.h

heartbeat_test.o: heartbeat_test.c

hmactest.o: ../e_os.h ../include/openssl/asn1.h ../include/openssl/bio.h

hmactest.o: ../include/openssl/crypto.h ../include/openssl/e_os2.h

hmactest.o: ../include/openssl/evp.h ../include/openssl/hmac.h