test/src/client.c

   1 /* A little hacked up program that makes a TCP/IP call and reads a script to
   2 drive it, for testing Exim server code running as a daemon. It's got a bit
   3 messy with the addition of support for either OpenSSL or GnuTLS. The code for
   4 those was hacked out of Exim itself, then code for OpenSSL OCSP stapling was
   5 ripped from the openssl ocsp and s_client utilities. */
   6
   7 /* ANSI C standard includes */
   8
   9 #include <ctype.h>
  10 #include <signal.h>
  11 #include <stdarg.h>
  12 #include <stddef.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <time.h>
  17
  18 /* Unix includes */
  19
  20 #include <errno.h>
  21 #include <dirent.h>
  22 #include <sys/types.h>
  23
  24 #include <netinet/in_systm.h>
  25 #include <netinet/in.h>
  26 #include <netinet/ip.h>
  27 #include <netinet/tcp.h>
  28
  29 #include <netdb.h>
  30 #include <arpa/inet.h>
  31 #include <sys/time.h>
  32 #include <sys/resource.h>
  33 #include <sys/socket.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <unistd.h>
  37 #include <utime.h>
  38
  39 /* Set to TRUE to enable debug output */
  40 #define DEBUG if (FALSE)
  41
  42 #ifdef AF_INET6
  43 #define HAVE_IPV6 1
  44 #endif
  45
  46 #ifndef S_ADDR_TYPE
  47 #define S_ADDR_TYPE u_long
  48 #endif
  49
  50 typedef unsigned char uschar;
  51
  52 #define CS   (char *)
  53 #define US   (unsigned char *)
  54
  55 #define FALSE         0
  56 #define TRUE          1
  57
  58
  59
  60 static int sigalrm_seen = 0;
  61
  62
  63 /* TLS support can be optionally included, either for OpenSSL or GnuTLS. The
  64 latter needs a whole pile of tables. */
  65 #ifdef HAVE_OPENSSL
  66 # define HAVE_TLS
  67 # include <openssl/crypto.h>
  68 # include <openssl/x509.h>
  69 # include <openssl/pem.h>
  70 # include <openssl/ssl.h>
  71 # include <openssl/err.h>
  72 # include <openssl/rand.h>
  73
  74 # if OPENSSL_VERSION_NUMBER < 0x0090806fL && !defined(DISABLE_OCSP) && !defined(OPENSSL_NO_TLSEXT)
  75 #  warning "OpenSSL library version too old; define DISABLE_OCSP in Makefile"
  76 #  define DISABLE_OCSP
  77 # endif
  78 # ifndef DISABLE_OCSP
  79 #  include <openssl/ocsp.h>
  80 # endif
  81 #endif
  82
  83
  84 #ifdef HAVE_GNUTLS
  85 # define HAVE_TLS
  86 # include <gnutls/gnutls.h>
  87 # include <gnutls/x509.h>
  88 # if GNUTLS_VERSION_NUMBER >= 0x030103
  89 #  define HAVE_OCSP
  90 #  include <gnutls/ocsp.h>
  91 # endif
  92 # ifndef GNUTLS_NO_EXTENSIONS
  93 #  define GNUTLS_NO_EXTENSIONS 0
  94 # endif
  95
  96 # define DH_BITS      768
  97
  98 /* Local static variables for GNUTLS */
  99
 100 static gnutls_dh_params_t dh_params = NULL;
 101
 102 static gnutls_certificate_credentials_t x509_cred = NULL;
 103 static gnutls_session_t tls_session = NULL;
 104
 105 static int  ssl_session_timeout = 200;
 106
 107 /* Priorities for TLS algorithms to use. */
 108
 109 # if GNUTLS_VERSION_NUMBER < 0x030400
 110 static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 };
 111
 112 static const int kx_priority[16] = {
 113   GNUTLS_KX_RSA,
 114   GNUTLS_KX_DHE_DSS,
 115   GNUTLS_KX_DHE_RSA,
 116   0 };
 117
 118 static int default_cipher_priority[16] = {
 119   GNUTLS_CIPHER_AES_256_CBC,
 120   GNUTLS_CIPHER_AES_128_CBC,
 121   GNUTLS_CIPHER_3DES_CBC,
 122   GNUTLS_CIPHER_ARCFOUR_128,
 123   0 };
 124
 125 static const int mac_priority[16] = {
 126   GNUTLS_MAC_SHA,
 127   GNUTLS_MAC_MD5,
 128   0 };
 129
 130 static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 };
 131 # endif
 132
 133 #endif  /*HAVE_GNUTLS*/
 134
 135
 136
 137 #ifdef HAVE_TLS
 138 char * ocsp_stapling = NULL;
 139 char * pri_string = NULL;
 140 #endif
 141
 142
 143 /*************************************************
 144 *            SIGALRM handler - crash out         *
 145 *************************************************/
 146
 147 static void
 148 sigalrm_handler_crash(int sig)
 149 {
 150 sig = sig;    /* Keep picky compilers happy */
 151 printf("\nClient timed out\n");
 152 exit(99);
 153 }
 154
 155
 156 /*************************************************
 157 *            SIGALRM handler - set flag          *
 158 *************************************************/
 159
 160 static void
 161 sigalrm_handler_flag(int sig)
 162 {
 163 sig = sig;    /* Keep picky compilers happy */
 164 sigalrm_seen = 1;
 165 }
 166
 167
 168
 169 /****************************************************************************/
 170 /****************************************************************************/
 171
 172 #ifdef HAVE_OPENSSL
 173 # ifndef DISABLE_OCSP
 174
 175 static STACK_OF(X509) *
 176 chain_from_pem_file(const uschar * file)
 177 {
 178 BIO * bp;
 179 X509 * x;
 180 STACK_OF(X509) * sk;
 181
 182 if (!(sk = sk_X509_new_null())) return NULL;
 183 if (!(bp = BIO_new_file(CS file, "r"))) return NULL;
 184 while ((x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
 185   sk_X509_push(sk, x);
 186 BIO_free(bp);
 187 return sk;
 188 }
 189
 190
 191
 192 static void
 193 cert_stack_free(STACK_OF(X509) * sk)
 194 {
 195 while (sk_X509_num(sk) > 0) (void) sk_X509_pop(sk);
 196 sk_X509_free(sk);
 197 }
 198
 199
 200 static int
 201 tls_client_stapling_cb(SSL *s, void *arg)
 202 {
 203 const unsigned char *p;
 204 int len;
 205 OCSP_RESPONSE *rsp;
 206 OCSP_BASICRESP *bs;
 207 STACK_OF(X509) * sk;
 208 int ret = 1;
 209
 210 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
 211 /*BIO_printf(arg, "OCSP response: ");*/
 212 if (!p)
 213         {
 214         BIO_printf(arg, "no response received\n");
 215         return 1;
 216         }
 217 if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len)))
 218         {
 219         BIO_printf(arg, "response parse error\n");
 220         BIO_dump_indent(arg, (char *)p, len, 4);
 221         return 0;
 222         }
 223 if(!(bs = OCSP_response_get1_basic(rsp)))
 224   {
 225   BIO_printf(arg, "error parsing response\n");
 226   return 0;
 227   }
 228
 229
 230 if (!(sk = chain_from_pem_file((const uschar *)ocsp_stapling)))
 231   {
 232   BIO_printf(arg, "error in cert setup\n");
 233   return 0;
 234   }
 235
 236 /* OCSP_basic_verify takes a "store" arg, but does not
 237 use it for the chain verification, which is all we do
 238 when OCSP_NOVERIFY is set.  The content from the wire
 239 (in "bs") and a cert-stack "sk" are all that is used. */
 240
 241 if(OCSP_basic_verify(bs, sk, NULL, OCSP_NOVERIFY) <= 0)
 242   {
 243   BIO_printf(arg, "Response Verify Failure\n");
 244   ERR_print_errors(arg);
 245   ret = 0;
 246   }
 247 else
 248   BIO_printf(arg, "Response verify OK\n");
 249
 250 cert_stack_free(sk);
 251 return ret;
 252 }
 253 # endif /*DISABLE_OCSP*/
 254
 255
 256 /*************************************************
 257 *         Start an OpenSSL TLS session           *
 258 *************************************************/
 259
 260 int
 261 tls_start(int sock, SSL **ssl, SSL_CTX *ctx)
 262 {
 263 int rc;
 264 static const unsigned char *sid_ctx = US"exim";
 265
 266 RAND_load_file("client.c", -1);   /* Not *very* random! */
 267
 268 *ssl = SSL_new (ctx);
 269 SSL_set_session_id_context(*ssl, sid_ctx, strlen(CS sid_ctx));
 270 SSL_set_fd (*ssl, sock);
 271 SSL_set_connect_state(*ssl);
 272
 273 #ifndef DISABLE_OCSP
 274 if (ocsp_stapling)
 275   {
 276   SSL_CTX_set_tlsext_status_cb(ctx, tls_client_stapling_cb);
 277   SSL_CTX_set_tlsext_status_arg(ctx, BIO_new_fp(stdout, BIO_NOCLOSE));
 278   SSL_set_tlsext_status_type(*ssl, TLSEXT_STATUSTYPE_ocsp);
 279   }
 280 #endif
 281
 282 signal(SIGALRM, sigalrm_handler_flag);
 283 sigalrm_seen = 0;
 284 alarm(5);
 285 rc = SSL_connect (*ssl);
 286 alarm(0);
 287
 288 if (sigalrm_seen)
 289   {
 290   printf("SSL_connect timed out\n");
 291   return 0;
 292   }
 293
 294 if (rc <= 0)
 295   {
 296   ERR_print_errors_fp(stdout);
 297   return 0;
 298   }
 299
 300 printf("SSL connection using %s\n", SSL_get_cipher (*ssl));
 301 return 1;
 302 }
 303
 304
 305 /*************************************************
 306 *           SSL Information callback             *
 307 *************************************************/
 308
 309 static void
 310 info_callback(SSL *s, int where, int ret)
 311 {
 312 where = where;
 313 ret = ret;
 314 printf("SSL info: %s\n", SSL_state_string_long(s));
 315 }
 316 #endif
 317
 318
 319 /****************************************************************************/
 320 /****************************************************************************/
 321
 322
 323 #ifdef HAVE_GNUTLS
 324 /*************************************************
 325 *            Handle GnuTLS error                 *
 326 *************************************************/
 327
 328 /* Called from lots of places when errors occur before actually starting to do
 329 the TLS handshake, that is, while the session is still in clear.
 330
 331 Argument:
 332   prefix    prefix text
 333   err       a GnuTLS error number, or 0 if local error
 334
 335 Returns:    doesn't - it dies
 336 */
 337
 338 static void
 339 gnutls_error(uschar *prefix, int err)
 340 {
 341 fprintf(stderr, "GnuTLS connection error: %s:", prefix);
 342 if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err));
 343 fprintf(stderr, "\n");
 344 exit(98);
 345 }
 346
 347
 348
 349 /*************************************************
 350 *             Setup up DH parameters             *
 351 *************************************************/
 352
 353 /* For the test suite, the parameters should always be available in the spool
 354 directory. */
 355
 356 static void
 357 init_dh(void)
 358 {
 359 int fd;
 360 int ret;
 361 gnutls_datum_t m;
 362 uschar filename[200];
 363 struct stat statbuf;
 364
 365 /* Initialize the data structures for holding the parameters */
 366
 367 ret = gnutls_dh_params_init(&dh_params);
 368 if (ret < 0) gnutls_error(US"init dh_params", ret);
 369
 370 /* Open the cache file for reading and if successful, read it and set up the
 371 parameters. */
 372
 373 fd = open("aux-fixed/gnutls-params", O_RDONLY, 0);
 374 if (fd < 0)
 375   {
 376   fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno));
 377   exit(97);
 378   }
 379
 380 if (fstat(fd, &statbuf) < 0)
 381   {
 382   (void)close(fd);
 383   return gnutls_error(US"TLS cache stat failed", 0);
 384   }
 385
 386 m.size = statbuf.st_size;
 387 m.data = malloc(m.size);
 388 if (m.data == NULL)
 389   return gnutls_error(US"memory allocation failed", 0);
 390 if (read(fd, m.data, m.size) != m.size)
 391   return gnutls_error(US"TLS cache read failed", 0);
 392 (void)close(fd);
 393
 394 ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM);
 395 if (ret < 0) return gnutls_error(US"DH params import", ret);
 396 free(m.data);
 397 }
 398
 399
 400
 401
 402 /*************************************************
 403 *            Initialize for GnuTLS               *
 404 *************************************************/
 405
 406 /*
 407 Arguments:
 408   certificate     certificate file
 409   privatekey      private key file
 410 */
 411
 412 static void
 413 tls_init(uschar *certificate, uschar *privatekey)
 414 {
 415 int rc;
 416
 417 rc = gnutls_global_init();
 418 if (rc < 0) gnutls_error(US"gnutls_global_init", rc);
 419
 420 /* Read D-H parameters from the cache file. */
 421
 422 init_dh();
 423
 424 /* Create the credentials structure */
 425
 426 rc = gnutls_certificate_allocate_credentials(&x509_cred);
 427 if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc);
 428
 429 /* Set the certificate and private keys */
 430
 431 if (certificate != NULL)
 432   {
 433   rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate,
 434     CS privatekey, GNUTLS_X509_FMT_PEM);
 435   if (rc < 0) gnutls_error(US"gnutls_certificate", rc);
 436   }
 437
 438 /* Associate the parameters with the x509 credentials structure. */
 439
 440 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 441
 442 /* set the CA info for server-cert verify */
 443 if (ocsp_stapling)
 444   gnutls_certificate_set_x509_trust_file(x509_cred, ocsp_stapling,
 445         GNUTLS_X509_FMT_PEM);
 446 }
 447
 448
 449
 450 /*************************************************
 451 *        Initialize a single GNUTLS session      *
 452 *************************************************/
 453
 454 static gnutls_session_t
 455 tls_session_init(void)
 456 {
 457 gnutls_session_t session;
 458
 459 gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_NO_EXTENSIONS);
 460
 461 # if GNUTLS_VERSION_NUMBER < 0x030400
 462 gnutls_cipher_set_priority(session, default_cipher_priority);
 463 gnutls_compression_set_priority(session, comp_priority);
 464 gnutls_kx_set_priority(session, kx_priority);
 465 gnutls_protocol_set_priority(session, protocol_priority);
 466 gnutls_mac_set_priority(session, mac_priority);
 467
 468 gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 469 # else
 470 if (pri_string)
 471   {
 472   gnutls_priority_t priority_cache;
 473   const char * errpos;
 474
 475   gnutls_priority_init(&priority_cache, pri_string, &errpos);
 476   gnutls_priority_set(session, priority_cache);
 477   }
 478 else
 479   gnutls_set_default_priority(session);
 480 gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 481 # endif
 482
 483 gnutls_dh_set_prime_bits(session, DH_BITS);
 484 gnutls_db_set_cache_expiration(session, ssl_session_timeout);
 485
 486 return session;
 487 }
 488 #endif
 489
 490
 491 /****************************************************************************/
 492 /* Turn "\n" and "\r" into the relevant characters. This is a hack. */
 493
 494 static int
 495 unescape_buf(unsigned char * buf, int len)
 496 {
 497 unsigned char * s;
 498 unsigned char c, t;
 499 unsigned shift;
 500
 501 for (s = buf; s < buf+len; s++) if (*s == '\\')
 502   {
 503   switch (s[1])
 504     {
 505     default:    c = s[1]; shift = 1; break;
 506     case 'n':   c = '\n'; shift = 1; break;
 507     case 'r':   c = '\r'; shift = 1; break;
 508     case 'x':
 509                 t = s[2];
 510                 if (t >= 'A' && t <= 'F') t -= 'A'-'9'-1;
 511                 else if (t >= 'a' && t <= 'f') t -= 'a'-'9'-1;
 512                 t -= '0';
 513                 c = (t<<4) & 0xf0;
 514                 t = s[3];
 515                 if (t >= 'A' && t <= 'F') t -= 'A'-'9'-1;
 516                 else if (t >= 'a' && t <= 'f') t -= 'a'-'9'-1;
 517                 t -= '0';
 518                 c |= t & 0xf;
 519                 shift = 3;
 520                 break;
 521     }
 522   *s = c;
 523   memmove(s+1, s+shift+1, len-shift);
 524   len -= shift;
 525   }
 526 return len;
 527 }
 528
 529
 530 /****************************************************************************/
 531 typedef struct {
 532   int   sock;
 533   int   tls_active;
 534 #ifdef HAVE_OPENSSL
 535   SSL_CTX * ctx;
 536   SSL * ssl;
 537 #endif
 538   int   sent_starttls;
 539 } srv_ctx;
 540
 541 static void
 542 do_file(srv_ctx * srv, FILE * f, int timeout,
 543   unsigned char * inbuffer, unsigned bsiz, unsigned char * inptr)
 544 {
 545 unsigned char outbuffer[1024 * 20];
 546
 547 while (fgets(CS outbuffer, sizeof(outbuffer), f) != NULL)
 548   {
 549   int n = (int)strlen(CS outbuffer);
 550   int crlf = 1;
 551   int rc;
 552
 553   /* Strip trailing newline */
 554   if (outbuffer[n-1] == '\n') outbuffer[--n] = 0;
 555
 556   /* Expect incoming */
 557
 558   if (  strncmp(CS outbuffer, "???", 3) == 0
 559      && (outbuffer[3] == ' ' || outbuffer[3] == '*' || outbuffer[3] == '?')
 560      )
 561     {
 562     unsigned char *lineptr;
 563     unsigned exp_eof = outbuffer[3] == '*';
 564     unsigned resp_optional = outbuffer[3] == '?';
 565
 566     printf("%s\n", outbuffer);
 567     n = unescape_buf(outbuffer, n);
 568
 569 nextinput:
 570     if (*inptr == 0)   /* Refill input buffer */
 571       {
 572       unsigned char *inbufferp = inbuffer;
 573
 574       alarm(timeout);
 575       for (;;)
 576         {
 577         if (srv->tls_active)
 578           {
 579 #ifdef HAVE_OPENSSL
 580           int error;
 581           DEBUG { printf("call SSL_read\n"); fflush(stdout); }
 582           rc = SSL_read(srv->ssl, inbufferp, bsiz - (inbufferp - inbuffer) - 1);
 583           DEBUG { printf("SSL_read: %d\n", rc); fflush(stdout); }
 584           if (rc <= 0)
 585             switch (error = SSL_get_error(srv->ssl, rc))
 586               {
 587               case SSL_ERROR_ZERO_RETURN:
 588                 break;
 589               case SSL_ERROR_SYSCALL:
 590                 printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
 591                 rc = -1;
 592                 break;
 593               case SSL_ERROR_SSL:
 594                 printf("%s\nTLS terminated\n", ERR_error_string(ERR_get_error(), NULL));
 595                 SSL_shutdown(srv->ssl);
 596                 SSL_free(srv->ssl);
 597                 srv->tls_active = FALSE;
 598                 {       /* OpenSSL leaves it in restartsys mode */
 599                 struct sigaction act = {.sa_handler = sigalrm_handler_flag, .sa_flags = 0};
 600                 sigalrm_seen = 1;
 601                 sigaction(SIGALRM, &act, NULL);
 602                 }
 603                 *inptr = 0;
 604                 DEBUG { printf("go round\n"); fflush(stdout); }
 605                 goto nextinput;
 606               default:
 607                 printf("SSL error code %d\n", error);
 608               }
 609 #endif
 610 #ifdef HAVE_GNUTLS
 611         retry1:
 612           DEBUG { printf("call gnutls_record_recv\n"); fflush(stdout); }
 613           rc = gnutls_record_recv(tls_session, CS inbufferp, bsiz - (inbufferp - inbuffer) - 1);
 614           if (rc < 0)
 615             {
 616             DEBUG { printf("gnutls_record_recv: %s\n", gnutls_strerror(rc)); fflush(stdout); }
 617             if (rc == GNUTLS_E_INTERRUPTED || rc == GNUTLS_E_AGAIN)
 618               goto retry1;
 619             printf("%s\n", gnutls_strerror(rc));
 620             srv->tls_active = FALSE;
 621             *inptr = 0;
 622             DEBUG { printf("go round\n"); fflush(stdout); }
 623             goto nextinput;
 624             }
 625           DEBUG { printf("gnutls_record_recv: %d\n", rc); fflush(stdout); }
 626 #endif
 627           }
 628         else
 629           {
 630           DEBUG { printf("call read\n"); fflush(stdout); }
 631           rc = read(srv->sock, inbufferp, bsiz - (inbufferp - inbuffer) - 1);
 632           DEBUG { printf("read: %d\n", rc); fflush(stdout); }
 633           }
 634
 635           if (rc > 0) inbufferp[rc] = '\0';
 636           if (rc <= 0 || strchr(inbufferp, '\n')) break;
 637           inbufferp += rc;
 638           if (inbufferp >= inbuffer + bsiz)
 639             {
 640             printf("Input buffer overrun, need more than %d bytes input buffer\n", bsiz);
 641             exit(73);
 642             }
 643           DEBUG { printf("read more\n"); }
 644         }
 645       alarm(0);
 646
 647       if (rc < 0)
 648         {
 649         if (errno == EINTR && sigalrm_seen && resp_optional)
 650           continue;     /* next scriptline */
 651         printf("Read error: %s\n", strerror(errno));
 652         exit(81);
 653         }
 654       else if (rc == 0)
 655         if (exp_eof)
 656           {
 657           printf("Expected EOF read\n");
 658           continue;
 659           }
 660         else if (resp_optional)
 661           continue;     /* next scriptline */
 662         else
 663           {
 664           printf("Unexpected EOF read\n");
 665           close(srv->sock);
 666           exit(80);
 667           }
 668       else if (exp_eof)
 669         {
 670         printf("Expected EOF not read\n");
 671         close(srv->sock);
 672         exit(74);
 673         }
 674       else
 675         inptr = inbuffer;
 676       }
 677     DEBUG { printf("read: '%s'\n", inptr); fflush(stdout); }
 678
 679     lineptr = inptr;
 680     while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++;
 681     if (*inptr != 0)
 682       {
 683       *inptr++ = 0;
 684       if (*inptr == '\n') inptr++;
 685       }
 686
 687     if (strncmp(CS lineptr, CS outbuffer + 4, n - 4) != 0)
 688       if (resp_optional)
 689         {
 690         inptr = lineptr;        /* consume scriptline, not inputline */
 691         continue;
 692         }
 693       else
 694         {
 695         printf("<<< %s\n", lineptr);
 696         printf("\n******** Input mismatch ********\n");
 697         exit(79);
 698         }
 699
 700     /* Input matched script.  Output the inputline, unless optional  */
 701     DEBUG { printf("read matched\n"); fflush(stdout); }
 702
 703     if (!resp_optional)
 704         printf("<<< %s\n", lineptr);
 705     else
 706
 707     /* If there is further input after this line, consume inputline but not
 708     scriptline in case there are several matching.  Nonmatches are dealt with
 709     above. */
 710
 711         if (*inptr != 0)
 712           goto nextinput;
 713
 714     #ifdef HAVE_TLS
 715     if (srv->sent_starttls)
 716       {
 717       if (lineptr[0] == '2')
 718         {
 719         unsigned int verify;
 720
 721         printf("Attempting to start TLS\n");
 722         fflush(stdout);
 723
 724         #ifdef HAVE_OPENSSL
 725         srv->tls_active = tls_start(srv->sock, &srv->ssl, srv->ctx);
 726         #endif
 727
 728         #ifdef HAVE_GNUTLS
 729           {
 730           int rc;
 731           fd_set rfd;
 732           struct timeval tv = { 0, 2000 };
 733
 734           sigalrm_seen = FALSE;
 735           alarm(timeout);
 736           do {
 737             rc = gnutls_handshake(tls_session);
 738           } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
 739           srv->tls_active = rc >= 0;
 740           alarm(0);
 741
 742           if (!srv->tls_active) printf("%s\n", gnutls_strerror(rc));
 743
 744           /* look for an error on the TLS conn */
 745           FD_ZERO(&rfd);
 746           FD_SET(srv->sock, &rfd);
 747           if (select(srv->sock+1, &rfd, NULL, NULL, &tv) > 0)
 748             {
 749           retry2:
 750             DEBUG { printf("call gnutls_record_recv\n"); fflush(stdout); }
 751             rc = gnutls_record_recv(tls_session, CS inbuffer, bsiz - 1);
 752             if (rc < 0)
 753               {
 754               DEBUG { printf("gnutls_record_recv: %s\n", gnutls_strerror(rc)); fflush(stdout); }
 755               if (rc == GNUTLS_E_INTERRUPTED || rc == GNUTLS_E_AGAIN)
 756                 goto retry2;
 757               printf("%s\n", gnutls_strerror(rc));
 758               srv->tls_active = FALSE;
 759               }
 760             DEBUG { printf("gnutls_record_recv: %d\n", rc); fflush(stdout); }
 761             }
 762           }
 763         #endif
 764
 765         if (!srv->tls_active)
 766           {
 767           printf("Failed to start TLS\n");
 768           fflush(stdout);
 769           }
 770         #ifdef HAVE_GNUTLS
 771         else if (ocsp_stapling)
 772           {
 773           if ((rc= gnutls_certificate_verify_peers2(tls_session, &verify)) < 0)
 774             {
 775             printf("Failed to verify certificate: %s\n", gnutls_strerror(rc));
 776             fflush(stdout);
 777             }
 778           else if (verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED))
 779             {
 780             printf("Bad certificate\n");
 781             fflush(stdout);
 782             }
 783           #ifdef HAVE_OCSP
 784           else if (gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
 785             {
 786             printf("Failed to verify certificate status\n");
 787               {
 788               gnutls_datum_t stapling;
 789               gnutls_ocsp_resp_t resp;
 790               gnutls_datum_t printed;
 791               if (  (rc= gnutls_ocsp_status_request_get(tls_session, &stapling)) == 0
 792                  && (rc= gnutls_ocsp_resp_init(&resp)) == 0
 793                  && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0
 794                  && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0
 795                  )
 796                 {
 797                 fprintf(stderr, "%.4096s", printed.data);
 798                 gnutls_free(printed.data);
 799                 }
 800               else
 801                 (void) fprintf(stderr,"ocsp decode: %s", gnutls_strerror(rc));
 802               }
 803             fflush(stdout);
 804             }
 805           #endif
 806           }
 807         #endif
 808         else
 809           printf("Succeeded in starting TLS\n");
 810         }
 811       else printf("Abandoning TLS start attempt\n");
 812       }
 813     srv->sent_starttls = 0;
 814     #endif
 815     }
 816
 817   /* Wait for a bit before proceeding */
 818
 819   else if (strncmp(CS outbuffer, "+++ ", 4) == 0)
 820     {
 821     printf("%s\n", outbuffer);
 822     sleep(atoi(CS outbuffer + 4));
 823     }
 824
 825   /* Stack new input file */
 826
 827   else if (strncmp(CS outbuffer, "<<< ", 4) == 0)
 828     {
 829     FILE * new_f;
 830     if (!(new_f = fopen((const char *)outbuffer+4 , "r")))
 831       {
 832       printf("Unable to open '%s': %s", inptr, strerror(errno));
 833       exit(74);
 834       }
 835     do_file(srv, new_f, timeout, inbuffer, bsiz, inptr);
 836     }
 837
 838
 839   /* Send line outgoing, but barf if unconsumed incoming */
 840
 841   else
 842     {
 843     unsigned char * out = outbuffer;
 844
 845     if (strncmp(CS outbuffer, ">>> ", 4) == 0)
 846       {
 847       crlf = 0;
 848       out += 4;
 849       n -= 4;
 850       }
 851
 852     if (*inptr != 0)
 853       {
 854       printf("Unconsumed input: %s", inptr);
 855       printf("   About to send: %s\n", out);
 856       exit(78);
 857       }
 858
 859     #ifdef HAVE_TLS
 860
 861     /* Shutdown TLS */
 862
 863     if (strcmp(CS out, "stoptls") == 0 ||
 864         strcmp(CS out, "STOPTLS") == 0)
 865       {
 866       if (!srv->tls_active)
 867         {
 868         printf("STOPTLS read when TLS not active\n");
 869         exit(77);
 870         }
 871       printf("Shutting down TLS encryption\n");
 872
 873       #ifdef HAVE_OPENSSL
 874       SSL_shutdown(srv->ssl);
 875       SSL_free(srv->ssl);
 876       #endif
 877
 878       #ifdef HAVE_GNUTLS
 879       gnutls_bye(tls_session, GNUTLS_SHUT_WR);
 880       gnutls_deinit(tls_session);
 881       tls_session = NULL;
 882       gnutls_global_deinit();
 883       #endif
 884
 885       srv->tls_active = 0;
 886       continue;
 887       }
 888
 889     /* Remember that we sent STARTTLS */
 890
 891     srv->sent_starttls = (strcmp(CS out, "starttls") == 0 ||
 892                      strcmp(CS out, "STARTTLS") == 0);
 893
 894     /* Fudge: if the command is "starttls_wait", we send the starttls bit,
 895     but we haven't set the flag, so that there is no negotiation. This is for
 896     testing the server's timeout. */
 897
 898     if (strcmp(CS out, "starttls_wait") == 0)
 899       {
 900       out[8] = 0;
 901       n = 8;
 902       }
 903     #endif
 904
 905     printf(">>> %s\n", out);
 906     if (crlf)
 907       {
 908       strcpy(CS out + n, "\r\n");
 909       n += 2;
 910       }
 911
 912     n = unescape_buf(out, n);
 913
 914     /* OK, do it */
 915
 916     alarm(timeout);
 917     if (srv->tls_active)
 918       {
 919       #ifdef HAVE_OPENSSL
 920         rc = SSL_write (srv->ssl, out, n);
 921       #endif
 922       #ifdef HAVE_GNUTLS
 923         if ((rc = gnutls_record_send(tls_session, CS out, n)) < 0)
 924           {
 925           printf("GnuTLS write error: %s\n", gnutls_strerror(rc));
 926           exit(76);
 927           }
 928       #endif
 929       }
 930     else
 931       rc = write(srv->sock, out, n);
 932     alarm(0);
 933
 934     if (rc < 0)
 935       {
 936       printf("Write error: %s\n", strerror(errno));
 937       exit(75);
 938       }
 939     }
 940   }
 941 }
 942
 943
 944
 945
 946 /*************************************************
 947 *                 Main Program                   *
 948 *************************************************/
 949
 950 const char * const HELP_MESSAGE = "\n\
 951 Usage: client\n"
 952 #ifdef HAVE_TLS
 953 "\
 954           [-tls-on-connect]\n\
 955           [-ocsp]\n"
 956 # ifdef HAVE_GNUTLS
 957 "\
 958           [-p priority-string]\n"
 959 # endif
 960 #endif
 961 "\
 962           [-tn] n seconds timeout\n\
 963           <IP address>\n\
 964           <port>\n\
 965           [<outgoing interface>]\n\
 966           [<cert file>]\n\
 967           [<key file>]\n\
 968 \n";
 969
 970 int
 971 main(int argc, char **argv)
 972 {
 973 struct sockaddr *s_ptr;
 974 struct sockaddr_in s_in4;
 975 char *interface = NULL;
 976 char *address = NULL;
 977 char *certfile = NULL;
 978 char *keyfile = NULL;
 979 char *end = NULL;
 980 int argi = 1;
 981 int host_af, port, s_len, rc, save_errno;
 982 int timeout = 5;
 983 int tls_on_connect = 0;
 984 long tmplong;
 985
 986 #if HAVE_IPV6
 987 struct sockaddr_in6 s_in6;
 988 #endif
 989
 990 srv_ctx srv;
 991
 992 unsigned char inbuffer[100 * 1024];
 993 unsigned char *inptr = inbuffer;
 994
 995 *inptr = 0;   /* Buffer empty */
 996 srv.tls_active = 0;
 997 srv.sent_starttls = 0;
 998
 999 /* Options */
1000
1001 while (argc >= argi + 1 && argv[argi][0] == '-')
1002   {
1003   if (strcmp(argv[argi], "-help") == 0 ||
1004       strcmp(argv[argi], "--help") == 0 ||
1005       strcmp(argv[argi], "-h") == 0)
1006     {
1007     puts(HELP_MESSAGE);
1008     exit(0);
1009     }
1010   if (strcmp(argv[argi], "-tls-on-connect") == 0)
1011     {
1012     tls_on_connect = 1;
1013     argi++;
1014     }
1015 #ifdef HAVE_TLS
1016   else if (strcmp(argv[argi], "-ocsp") == 0)
1017     {
1018     if (argc < ++argi + 1)
1019       {
1020       fprintf(stderr, "Missing required certificate file for ocsp option\n");
1021       exit(96);
1022       }
1023     ocsp_stapling = argv[argi++];
1024     }
1025 # ifdef HAVE_GNUTLS
1026   else if (strcmp(argv[argi], "-p") == 0)
1027     {
1028     if (argc < ++argi + 1)
1029       {
1030       fprintf(stderr, "Missing priority string\n");
1031       exit(96);
1032       }
1033     pri_string = argv[argi++];
1034     }
1035 #endif
1036
1037 #endif
1038   else if (argv[argi][1] == 't' && isdigit(argv[argi][2]))
1039     {
1040     tmplong = strtol(argv[argi]+2, &end, 10);
1041     if (end == argv[argi]+2 || *end)
1042       {
1043       fprintf(stderr, "Failed to parse seconds from option <%s>\n",
1044         argv[argi]);
1045       exit(95);
1046       }
1047     if (tmplong > 10000L)
1048       {
1049       fprintf(stderr, "Unreasonably long wait of %ld seconds requested\n",
1050         tmplong);
1051       exit(94);
1052       }
1053     if (tmplong < 0L)
1054       {
1055       fprintf(stderr, "Timeout must not be negative (%ld)\n", tmplong);
1056       exit(93);
1057       }
1058     timeout = (int) tmplong;
1059     argi++;
1060     }
1061   else
1062     {
1063     fprintf(stderr, "Unrecognized option %s\n", argv[argi]);
1064     exit(92);
1065     }
1066   }
1067
1068 /* Mandatory 1st arg is IP address */
1069
1070 if (argc < argi+1)
1071   {
1072   fprintf(stderr, "No IP address given\n");
1073   exit(91);
1074   }
1075
1076 address = argv[argi++];
1077 host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET;
1078
1079 /* Mandatory 2nd arg is port */
1080
1081 if (argc < argi+1)
1082   {
1083   fprintf(stderr, "No port number given\n");
1084   exit(90);
1085   }
1086
1087 port = atoi(argv[argi++]);
1088
1089 /* Optional next arg is interface */
1090
1091 if (argc > argi &&
1092   (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':'))
1093     interface = argv[argi++];
1094
1095 /* Any more arguments are the name of a certificate file and key file */
1096
1097 if (argc > argi) certfile = argv[argi++];
1098 if (argc > argi) keyfile = argv[argi++];
1099
1100
1101 #if HAVE_IPV6
1102 /* For an IPv6 address, use an IPv6 sockaddr structure. */
1103
1104 if (host_af == AF_INET6)
1105   {
1106   s_ptr = (struct sockaddr *)&s_in6;
1107   s_len = sizeof(s_in6);
1108   }
1109 else
1110 #endif
1111
1112 /* For an IPv4 address, use an IPv4 sockaddr structure,
1113 even on an IPv6 system. */
1114
1115   {
1116   s_ptr = (struct sockaddr *)&s_in4;
1117   s_len = sizeof(s_in4);
1118   }
1119
1120 printf("Connecting to %s port %d ... ", address, port);
1121
1122 srv.sock = socket(host_af, SOCK_STREAM, 0);
1123 if (srv.sock < 0)
1124   {
1125   printf("socket creation failed: %s\n", strerror(errno));
1126   exit(89);
1127   }
1128
1129 /* Bind to a specific interface if requested. On an IPv6 system, this has
1130 to be of the same family as the address we are calling. On an IPv4 system the
1131 test is redundant, but it keeps the code tidier. */
1132
1133 if (interface != NULL)
1134   {
1135   int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET;
1136
1137   if (interface_af == host_af)
1138     {
1139     #if HAVE_IPV6
1140
1141     /* Set up for IPv6 binding */
1142
1143     if (host_af == AF_INET6)
1144       {
1145       memset(&s_in6, 0, sizeof(s_in6));
1146       s_in6.sin6_family = AF_INET6;
1147       s_in6.sin6_port = 0;
1148       if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1)
1149         {
1150         printf("Unable to parse \"%s\"", interface);
1151         exit(88);
1152         }
1153       }
1154     else
1155     #endif
1156
1157     /* Set up for IPv4 binding */
1158
1159       {
1160       memset(&s_in4, 0, sizeof(s_in4));
1161       s_in4.sin_family = AF_INET;
1162       s_in4.sin_port = 0;
1163       s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface);
1164       }
1165
1166     /* Bind */
1167
1168     if (bind(srv.sock, s_ptr, s_len) < 0)
1169       {
1170       printf("Unable to bind outgoing SMTP call to %s: %s",
1171         interface, strerror(errno));
1172       exit(87);
1173       }
1174     }
1175   }
1176
1177 /* Set up a remote IPv6 address */
1178
1179 #if HAVE_IPV6
1180 if (host_af == AF_INET6)
1181   {
1182 # ifdef HAVE_GETADDRINFO
1183   struct addrinfo hints, *res;
1184   memset(&hints, 0, sizeof(hints));
1185   hints.ai_family = AF_INET6;
1186   hints.ai_socktype = SOCK_STREAM;
1187   hints.ai_flags = AI_NUMERICHOST;
1188   if ((rc = getaddrinfo(address, NULL, &hints, &res)) != 0 || res == NULL)
1189     {
1190     printf("unable to parse \"%s\" as an IP address: %s\n", address,
1191       rc == 0 ? "NULL result returned" : gai_strerror(rc));
1192     exit(86);
1193     }
1194   memcpy(&s_in6, res->ai_addr, res->ai_addrlen);
1195   freeaddrinfo(res);
1196 # else
1197   memset(&s_in6, 0, sizeof(s_in6));
1198   s_in6.sin6_family = AF_INET6;
1199   if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1)
1200     {
1201     printf("Unable to parse \"%s\"", address);
1202     exit(86);
1203     }
1204 # endif
1205   s_in6.sin6_port = htons(port);
1206   }
1207 else
1208 #endif
1209
1210 /* Set up a remote IPv4 address */
1211
1212   {
1213   memset(&s_in4, 0, sizeof(s_in4));
1214   s_in4.sin_family = AF_INET;
1215   s_in4.sin_port = htons(port);
1216   s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address);
1217   }
1218
1219 /* SIGALRM handler crashes out */
1220
1221 signal(SIGALRM, sigalrm_handler_crash);
1222 alarm(timeout);
1223 rc = connect(srv.sock, s_ptr, s_len);
1224 save_errno = errno;
1225 alarm(0);
1226
1227 /* A failure whose error code is "Interrupted system call" is in fact
1228 an externally applied timeout if the signal handler has been run. */
1229
1230 if (rc < 0)
1231   {
1232   close(srv.sock);
1233   printf("connect failed: %s\n", strerror(save_errno));
1234   exit(85);
1235   }
1236
1237 printf("connected\n");
1238
1239
1240 /* --------------- Set up for OpenSSL --------------- */
1241
1242 #ifdef HAVE_OPENSSL
1243 SSL_library_init();
1244 SSL_load_error_strings();
1245
1246 if (!(srv.ctx = SSL_CTX_new(SSLv23_method())))
1247   {
1248   printf ("SSL_CTX_new failed\n");
1249   exit(84);
1250   }
1251
1252 if (certfile)
1253   {
1254   if (!SSL_CTX_use_certificate_file(srv.ctx, certfile, SSL_FILETYPE_PEM))
1255     {
1256     printf("SSL_CTX_use_certificate_file failed\n");
1257     exit(83);
1258     }
1259   printf("Certificate file = %s\n", certfile);
1260   }
1261
1262 if (keyfile)
1263   {
1264   if (!SSL_CTX_use_PrivateKey_file(srv.ctx, keyfile, SSL_FILETYPE_PEM))
1265     {
1266     printf("SSL_CTX_use_PrivateKey_file failed\n");
1267     exit(82);
1268     }
1269   printf("Key file = %s\n", keyfile);
1270   }
1271
1272 SSL_CTX_set_session_cache_mode(srv.ctx, SSL_SESS_CACHE_BOTH);
1273 SSL_CTX_set_timeout(srv.ctx, 200);
1274 SSL_CTX_set_info_callback(srv.ctx, (void (*)())info_callback);
1275 #endif
1276
1277
1278 /* --------------- Set up for GnuTLS --------------- */
1279
1280 #ifdef HAVE_GNUTLS
1281 if (certfile != NULL) printf("Certificate file = %s\n", certfile);
1282 if (keyfile != NULL) printf("Key file = %s\n", keyfile);
1283 tls_init(US certfile, US keyfile);
1284 tls_session = tls_session_init();
1285 #ifdef HAVE_OCSP
1286 if (ocsp_stapling)
1287   gnutls_ocsp_status_request_enable_client(tls_session, NULL, 0, NULL);
1288 #endif
1289 gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr_t)(intptr_t)srv.sock);
1290
1291 /* When the server asks for a certificate and the client does not have one,
1292 there is a SIGPIPE error in the gnutls_handshake() function for some reason
1293 that is not understood. As luck would have it, this has never hit Exim itself
1294 because it ignores SIGPIPE errors. Doing the same here allows it all to work as
1295 one wants. */
1296
1297 signal(SIGPIPE, SIG_IGN);
1298 #endif
1299
1300 /* ---------------------------------------------- */
1301
1302
1303 /* Start TLS session if configured to do so without STARTTLS */
1304
1305 #ifdef HAVE_TLS
1306 if (tls_on_connect)
1307   {
1308   printf("Attempting to start TLS\n");
1309
1310 #ifdef HAVE_OPENSSL
1311   srv.tls_active = tls_start(srv.sock, &srv.ssl, srv.ctx);
1312 #endif
1313
1314 #ifdef HAVE_GNUTLS
1315   {
1316   int rc;
1317   sigalrm_seen = FALSE;
1318   alarm(timeout);
1319   do {
1320     rc = gnutls_handshake(tls_session);
1321   } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
1322   srv.tls_active = rc >= 0;
1323   alarm(0);
1324
1325   if (!srv.tls_active) printf("%s\n", gnutls_strerror(rc));
1326   }
1327 #endif
1328
1329   if (!srv.tls_active)
1330     printf("Failed to start TLS\n");
1331 #if defined(HAVE_GNUTLS) && defined(HAVE_OCSP)
1332   else if (  ocsp_stapling
1333           && gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
1334     printf("Failed to verify certificate status\n");
1335 #endif
1336   else
1337     printf("Succeeded in starting TLS\n");
1338   }
1339 #endif
1340
1341 do_file(&srv, stdin, timeout, inbuffer, sizeof(inbuffer), inptr);
1342
1343 printf("End of script\n");
1344 shutdown(srv.sock, SHUT_WR);
1345 if (fcntl(srv.sock, F_SETFL, O_NONBLOCK) == 0)
1346   while (read(srv.sock, inbuffer, sizeof(inbuffer)) > 0) ;
1347 close(srv.sock);
1348
1349 exit(0);
1350 }
1351
1352 /* End of client.c */