text: /*
   * Copyright (C) 2012 Free Software Foundation, Inc.
   *
   * Author: Nikos Mavrogiannopoulos
   *
   * This file is part of GnuTLS.
   *
   * GnuTLS is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 3 of the License, or
   * (at your option) any later version.
   *
   * GnuTLS is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with GnuTLS; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #if defined(_WIN32)
  
  int main()
  {
  	exit(77);
  }
  
  #else
  
  #include <string.h>
  #include <sys/types.h>
  #include <netinet/in.h>
  #include <sys/socket.h>
  #include <sys/wait.h>
  #include <arpa/inet.h>
  #include <unistd.h>
  #include <gnutls/gnutls.h>
  #include <signal.h>
  #include <assert.h>
  #include <errno.h>
  
  //#define USE_RDTSC
  //#define TEST_ETM
  
  #include <time.h>
  #include <sys/time.h>
  #include <sys/resource.h>
  #ifdef USE_RDTSC
  #include <x86intrin.h>
  #endif
  
  #ifdef DEBUG
  static void server_log_func(int level, const char *str)
  {
  	fprintf(stderr, "server|<%d>| %s", level, str);
  }
  
  static void client_log_func(int level, const char *str)
  {
  	fprintf(stderr, "client|<%d>| %s", level, str);
  }
  #endif
  
  
  
  #ifndef _POSIX_TIMERS
  #error need posix timers
  #endif
  
  #define CLOCK_TO_USE CLOCK_MONOTONIC
  //#define CLOCK_TO_USE CLOCK_MONOTONIC_RAW
  //#define CLOCK_TO_USE CLOCK_PROCESS_CPUTIME_ID
  
  /* This program tests the robustness of record
   * decoding.
   */
  #define MAX_PER_POINT (8*1024)
  #define WARM_UP (2)
  #define MAX_BUF 1024
  
  struct point_st {
  	unsigned char byte1;
  	unsigned char byte2;
  	unsigned midx;
  	unsigned taken;
  	unsigned long *smeasurements;
  };
  
  struct test_st {
  	struct point_st *points;
  	unsigned int npoints;
  	const char *desc;
  	const char *file;
  	const char *name;
  	unsigned text_size;
  	uint8_t fill;
  };
  
  struct point_st *prev_point_ptr = NULL;
  unsigned int point_idx = 0;
  static gnutls_session_t cli_session = NULL;
  
  static ssize_t
  push(gnutls_transport_ptr_t tr, const void *_data, size_t len)
  {
  	int fd = (long int) tr;
  
  	return send(fd, _data, len, 0);
  }
  
  static ssize_t
  push_crippled(gnutls_transport_ptr_t tr, const void *_data, size_t len)
  {
  	int fd = (long int) tr;
  	unsigned char *data = (void *) _data;
  	struct point_st *p;
  	unsigned p_size;
  	struct test_st *test = gnutls_session_get_ptr(cli_session);
  
  	p_size = test->npoints;
  
  	if (point_idx >= p_size)
  		abort();
  
  	p = &test->points[point_idx];
  
  
  	if (test->fill != 0xff) {
  		/* original lucky13 attack */
  		memmove(&data[len - 32], data + 5, 32);
  		data[len - 17] ^= p->byte1;
  		data[len - 18] ^= p->byte2;
  	} else {
  		/* a revised attack which depends on chosen-plaintext */
  		assert(len>512);
  		memmove(data+len-256-32, data+5, 256+32);
  		data[len - 257] ^= p->byte1;
  	}
  
  	return send(fd, data, len, 0);
  }
  
  
  #ifndef USE_RDTSC
  static unsigned long timespec_sub_ns(struct timespec *a,
  				     struct timespec *b)
  {
  	return (a->tv_sec - b->tv_sec) * 1000 * 1000 * 1000 + a->tv_nsec -
  		b->tv_nsec;
  }
  #endif
  
  static void
  client(int fd, const char *prio, unsigned int text_size,
         struct test_st *test)
  {
  	int ret;
  	char buffer[MAX_BUF + 1];
  	char *text;
  	gnutls_psk_client_credentials_t pskcred;
  	gnutls_session_t session;
  	static unsigned long measurement;
  	const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
  	const char *err;
  	unsigned j;
  
  	gnutls_global_init();
  
  	text = malloc(text_size);
  	assert(text != NULL);
  
  	setpriority(PRIO_PROCESS, getpid(), -15);
  
  	memset(text, test->fill, text_size);
  
  #ifdef DEBUG
  	gnutls_global_set_log_function(client_log_func);
  	gnutls_global_set_log_level(6);
  #endif
  
  	gnutls_psk_allocate_client_credentials(&pskcred);
  	gnutls_psk_set_client_credentials(pskcred, "test", &key,
  					  GNUTLS_PSK_KEY_HEX);
  
  	/* Initialize TLS session
  	 */
  	assert(gnutls_init(&session, GNUTLS_CLIENT) >= 0);
  	gnutls_session_set_ptr(session, test);
  	cli_session = session;
  
  	/* Use default priorities */
  	if ((ret = gnutls_priority_set_direct(session, prio, &err)) < 0) {
  		fprintf(stderr, "Error in priority string %s: %s\n",
  			gnutls_strerror(ret), err);
  		exit(1);
  	}
  
  	/* put the anonymous credentials to the current session
  	 */
  	gnutls_credentials_set(session, GNUTLS_CRD_PSK, pskcred);
  	gnutls_transport_set_int(session, fd);
  
  	/* Perform the TLS handshake
  	 */
  	do {
  		ret = gnutls_handshake(session);
  	}
  	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
  
  	if (ret < 0) {
  		fprintf(stderr, "client: Handshake failed: %s\n", gnutls_strerror(ret));
  		exit(1);
  	}
  
  	ret = gnutls_protocol_get_version(session);
  	if (ret < GNUTLS_TLS1_1) {
  		fprintf(stderr,
  			"client: Handshake didn't negotiate TLS 1.1 (or later)\n");
  		exit(1);
  	}
  
  	gnutls_transport_set_push_function(session, push_crippled);
  
   restart:
  	do {
  		ret = gnutls_record_send(session, text, sizeof(text));
  	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
  	/* measure peer's processing time */
  
  	do {
  		ret = gnutls_record_recv(session, buffer, sizeof(buffer));
  	} while (ret < 0
  		 && (ret == GNUTLS_E_AGAIN
  		     || ret == GNUTLS_E_INTERRUPTED));
  
  	if (ret > 0) {
  		struct point_st *point_ptr = NULL;
  
  		assert(ret == sizeof(measurement));
  
  		point_ptr = &test->points[point_idx];
  		point_ptr->taken++;
  
  		if (point_idx == 0) {
  			printf("%s: measurement: %u / %d\r", test->name, (unsigned)point_ptr->taken+1, MAX_PER_POINT+WARM_UP);
  		}
  
  		if (point_idx == 0 && point_ptr->midx+1 >= MAX_PER_POINT) {
  			goto finish;
  		}
  
  		if (point_ptr->taken >= WARM_UP) {
  			memcpy(&measurement, buffer, sizeof(measurement));
  			if (point_ptr->midx < MAX_PER_POINT) {
  				point_ptr->smeasurements[point_ptr->midx] =
  				    measurement;
  				point_ptr->midx++;
  				point_idx++;
  
  				if (point_idx >= test->npoints)
  					point_idx = 0;
  			}
  		}
  
  		goto restart;
  	} else {
  		abort();
  	}
  
  finish:
  	fprintf(stderr, "\ntest completed\n");
  
  	gnutls_transport_set_push_function(session, push);
  
  	gnutls_bye(session, GNUTLS_SHUT_WR);
  
  	{
  		unsigned i;
  		FILE *fp = NULL;
  
  		fp = fopen(test->file, "w");
  		assert(fp != NULL);
  
  		fprintf(fp, "Delta,");
  		for (j = 0; j < MAX_PER_POINT; j++) {
  			fprintf(fp, "measurement-%u%s", j, j!=(MAX_PER_POINT-1)?",":"");
  		}
  		fprintf(fp, "\n");
  		for (i = 0; i < test->npoints; i++) {
  			fprintf(fp, "%u,", (unsigned)test->points[i].byte1);
  			for (j = 0; j < MAX_PER_POINT; j++) {
  				fprintf(fp, "%u%s",
  					(unsigned) test->points[i].smeasurements[j],
  					(j!=MAX_PER_POINT-1)?",":"");
  
  			}
  			fprintf(fp, "\n");
  		}
  		printf("\n");
  
  		fclose(fp);
  	}
  
  	if (test->desc)
  		fprintf(stderr, "Description: %s\n", test->desc);
  
  	close(fd);
  
  	gnutls_deinit(session);
  
  	gnutls_psk_free_client_credentials(pskcred);
  
  	gnutls_global_deinit();
  	free(text);
  }
  
  static int
  pskfunc(gnutls_session_t session, const char *username,
  	gnutls_datum_t * key)
  {
  	key->data = gnutls_malloc(4);
  	key->data[0] = 0xDE;
  	key->data[1] = 0xAD;
  	key->data[2] = 0xBE;
  	key->data[3] = 0xEF;
  	key->size = 4;
  	return 0;
  }
  
  static void server(int fd, const char *prio)
  {
  	int ret;
  	char buffer[MAX_BUF + 1];
  	gnutls_session_t session;
  	gnutls_psk_server_credentials_t server_pskcred;
  	const char *err;
  #ifndef USE_RDTSC
  	struct timespec start, stop;
  #else
  	uint64_t c1, c2;
  	unsigned int i1;
  #endif
  	static unsigned long measurement;
  
  	setpriority(PRIO_PROCESS, getpid(), -15);
  
  	gnutls_global_init();
  	memset(buffer, 0, sizeof(buffer));
  
  #ifdef DEBUG
  	gnutls_global_set_log_function(server_log_func);
  	gnutls_global_set_log_level(6);
  #endif
  	assert(gnutls_psk_allocate_server_credentials(&server_pskcred)>=0);
  	gnutls_psk_set_server_credentials_function(server_pskcred,
  						   pskfunc);
  	assert(gnutls_init(&session, GNUTLS_SERVER)>=0);
  
  	/* avoid calling all the priority functions, since the defaults
  	 * are adequate.
  	 */
  	if ((ret = gnutls_priority_set_direct(session, prio, &err)) < 0) {
  		fprintf(stderr, "Error in priority string %s: %s\n",
  			gnutls_strerror(ret), err);
  		exit(1);
  	}
  
  	gnutls_credentials_set(session, GNUTLS_CRD_PSK, server_pskcred);
  	gnutls_transport_set_int(session, fd);
  
  	do {
  		ret = gnutls_handshake(session);
  	}
  	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
  	if (ret < 0) {
  #ifdef GNUTLS_E_PREMATURE_TERMINATION
  		if (ret != GNUTLS_E_PREMATURE_TERMINATION
  		    && ret != GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
  #else
  		if (ret != GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
  #endif
  		{
  			fprintf(stderr,
  				"server: Handshake has failed (%s)\n\n",
  				gnutls_strerror(ret));
  			exit(1);
  		}
  		goto finish;
  	}
  #ifdef TEST_ETM
  	assert(gnutls_session_etm_status(session)!=0);
  #else
  	assert(gnutls_session_etm_status(session)==0);
  #endif
  
   restart:
  	do {
  		ret = recv(fd, buffer, 1, MSG_PEEK);
  	} while (ret == -1 && errno == EAGAIN);
  
  #ifdef USE_RDTSC
  	c1 = __rdtscp(&i1);
  #else
  	clock_gettime(CLOCK_TO_USE, &start);
  #endif
  
  	do {
  		ret = gnutls_record_recv(session, buffer, sizeof(buffer));
  	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
  
  #ifdef USE_RDTSC
  	c2 = __rdtscp(&i1);
  	measurement = c2 - c1;
  #else
  	clock_gettime(CLOCK_TO_USE, &stop);
  	measurement = timespec_sub_ns(&stop, &start);
  #endif
  
  	if (ret == GNUTLS_E_DECRYPTION_FAILED) {
  		gnutls_session_force_valid(session);
  		do {
  			ret =
  			    gnutls_record_send(session, &measurement,
  					       sizeof(measurement));
  			/* GNUTLS_AL_FATAL, GNUTLS_A_BAD_RECORD_MAC); */
  		} while (ret == GNUTLS_E_AGAIN
  			 || ret == GNUTLS_E_INTERRUPTED);
  
  		if (ret >= 0) {
  			goto restart;
  		}
  	} else if (ret > 0) {
  		goto restart;
  	}
  
  	assert(ret <= 0);
  
  	/* do not wait for the peer to close the connection.
  	 */
  	gnutls_bye(session, GNUTLS_SHUT_WR);
  
        finish:
  	close(fd);
  	gnutls_deinit(session);
  
  	gnutls_psk_free_server_credentials(server_pskcred);
  
  	gnutls_global_deinit();
  }
  
  static void start(const char *prio, unsigned int text_size,
  		  struct test_st *p)
  {
  	int fd[2];
  	int ret;
  	pid_t child;
  
  	ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
  	if (ret < 0) {
  		perror("socketpair");
  		exit(1);
  	}
  
  	child = fork();
  	if (child < 0) {
  		perror("fork");
  		fprintf(stderr, "fork");
  		exit(1);
  	}
  
  	if (child != 0) {
  		/* parent */
  		close(fd[1]);
  		server(fd[0], prio);
  		kill(child, SIGTERM);
  	} else if (child == 0) {
  		close(fd[0]);
  		client(fd[1], prio, text_size, p);
  		exit(0);
  	}
  }
  
  static void ch_handler(int sig)
  {
  	int status;
  	wait(&status);
  	if (WEXITSTATUS(status) != 0 ||
  	    (WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV)) {
  		if (WIFSIGNALED(status))
  			fprintf(stderr, "Child died with sigsegv\n");
  		else
  			fprintf(stderr, "Child died with status %d\n",
  				WEXITSTATUS(status));
  	}
  	return;
  }
  
  #define NPOINTS 256
  static struct point_st all_points[NPOINTS];
  static struct point_st all_points_one[NPOINTS];
  
  /* Test that outputs a graph of the timings
   * when manipulating the last record byte (pad)
   * for AES-SHA1.
   */
  static struct test_st test_sha1 = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 18 * 16,
  	.name = "sha1",
  	.file = "out-sha1.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  /* Test that outputs a graph of the timings
   * when manipulating the last record byte (pad)
   * for AES-SHA256.
   */
  static struct test_st test_sha256 = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 17 * 16,
  	.name = "sha256",
  	.file = "out-sha256.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  static struct test_st test_sha256_new = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 1024 * 16,
  	.name = "sha256-new",
  	.file = "out-sha256-new.txt",
  	.fill = 0xff,
  	.desc = NULL
  };
  
  static struct test_st test_sha384 = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 33 * 16,
  	.name = "sha384",
  	.file = "out-sha384.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  /* Test that outputs a graph of the timings
   * when manipulating the last record byte (pad)
   * for AES-SHA1, on a short message.
   */
  static struct test_st test_sha1_short = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 16 * 2,
  	.name = "sha1-short",
  	.file = "out-sha1-short.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  /* Test that outputs a graph of the timings
   * when manipulating the last record byte (pad)
   * for AES-SHA256.
   */
  static struct test_st test_sha256_short = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 16 * 2,
  	.name = "sha256-short",
  	.file = "out-sha256-short.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  static struct test_st test_sha384_short = {
  	.points = all_points,
  	.npoints = NPOINTS,
  	.text_size = 16 * 2,
  	.name = "sha384-short",
  	.file = "out-sha384-short.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  /* Test that outputs a graph of the timings
   * when manipulating the last record byte (pad)
   * for AES-SHA1, on a short message and
   * the byte before the last is set to one.
   * (i.e. we want to see whether the padding
   *  [1,1] shows up in the measurements)
   */
  static struct test_st test_sha1_one = {
  	.points = all_points_one,
  	.npoints = NPOINTS,
  	.text_size = 16 * 2,
  	.name = "sha1-one",
  	.file = "out-sha1-one.txt",
  	.fill = 0x00,
  	.desc = NULL
  };
  
  int main(int argc, char **argv)
  {
  	unsigned int i;
  	struct test_st *test;
  	const char *hash;
  	char prio[512];
  	struct timespec res;
  
  	assert(clock_getres(CLOCK_TO_USE, &res) >= 0);
  	assert(res.tv_nsec < 100);
  
  	signal(SIGCHLD, ch_handler);
  	signal(SIGPIPE, SIG_IGN);
  
  	if (argc > 1) {
  		if (strcmp(argv[1], "sha1") == 0) {
  			test = &test_sha1;
  			hash = "SHA1";
  		} else if (strcmp(argv[1], "sha1-short") == 0) {
  			test = &test_sha1_short;
  			hash = "SHA1";
  		} else if (strcmp(argv[1], "sha256-short") == 0) {
  			test = &test_sha256_short;
  			hash = "SHA256";
  		} else if (strcmp(argv[1], "sha256-new") == 0) {
  			test = &test_sha256_new;
  			hash = "SHA256";
  		} else if (strcmp(argv[1], "sha256") == 0) {
  			test = &test_sha256;
  			hash = "SHA256";
  		} else if (strcmp(argv[1], "sha384-short") == 0) {
  			test = &test_sha384_short;
  			hash = "SHA384";
  		} else if (strcmp(argv[1], "sha384") == 0) {
  			test = &test_sha384;
  			hash = "SHA384";
  		} else if (strcmp(argv[1], "sha1-one") == 0) {
  			test = &test_sha1_one;
  			hash = "SHA1";
  		} else {
  			fprintf(stderr, "Unknown test: %s\n", argv[1]);
  			exit(1);
  		}
  	} else {
  		fprintf(stderr,
  			"Please specify the test, sha1, sha1-one, sha256, sha1-short, sha256-short\n");
  		exit(1);
  	}
  
  	memset(&all_points, 0, sizeof(all_points));
  	for (i = 0; i < 256; i++) {
  		all_points[i].byte1 = i;
  		all_points[i].byte2 = 0;
  		all_points[i].smeasurements =
  		    malloc(MAX_PER_POINT *
  			   sizeof(all_points[i].smeasurements[0]));
  	}
  
  	memset(&all_points_one, 0, sizeof(all_points_one));
  	for (i = 0; i < 256; i++) {
  		all_points_one[i].byte1 = i;
  		all_points_one[i].byte2 = 1;
  		all_points_one[i].smeasurements =
  		    all_points[i].smeasurements;
  	}
  
  
  	remove(test->file);
  	snprintf(prio, sizeof(prio),
  #ifdef TEST_ETM
  		 "NONE:+COMP-NULL:+AES-128-CBC:+AES-256-CBC:+%s:+PSK:+VERS-TLS1.2:+VERS-TLS1.1:+SIGN-ALL:+CURVE-ALL",
  #else
  		 "NONE:+COMP-NULL:+AES-128-CBC:+AES-256-CBC:+%s:+PSK:%%NO_ETM:+VERS-TLS1.2:+VERS-TLS1.1:+SIGN-ALL:+CURVE-ALL",
  #endif
  		 hash);
  
  	printf("\nAES-%s (calculating different padding timings)\n", hash);
  	start(prio, test->text_size, test);
  
  	signal(SIGCHLD, SIG_IGN);
  
  	return 0;
  }
  
  #endif				/* _WIN32 */
  