| 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. */ |
| 5 | |
| 6 | /* ANSI C standard includes */ |
| 7 | |
| 8 | #include <ctype.h> |
| 9 | #include <signal.h> |
| 10 | #include <stdarg.h> |
| 11 | #include <stddef.h> |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <string.h> |
| 15 | #include <time.h> |
| 16 | |
| 17 | /* Unix includes */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <dirent.h> |
| 21 | #include <sys/types.h> |
| 22 | |
| 23 | #include <netinet/in_systm.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <netinet/ip.h> |
| 26 | |
| 27 | #include <netdb.h> |
| 28 | #include <arpa/inet.h> |
| 29 | #include <sys/time.h> |
| 30 | #include <sys/resource.h> |
| 31 | #include <sys/socket.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <fcntl.h> |
| 34 | #include <unistd.h> |
| 35 | #include <utime.h> |
| 36 | |
| 37 | #ifdef AF_INET6 |
| 38 | #define HAVE_IPV6 1 |
| 39 | #endif |
| 40 | |
| 41 | #ifndef S_ADDR_TYPE |
| 42 | #define S_ADDR_TYPE u_long |
| 43 | #endif |
| 44 | |
| 45 | typedef unsigned char uschar; |
| 46 | |
| 47 | #define CS (char *) |
| 48 | #define US (unsigned char *) |
| 49 | |
| 50 | #define FALSE 0 |
| 51 | #define TRUE 1 |
| 52 | |
| 53 | |
| 54 | |
| 55 | static int sigalrm_seen = 0; |
| 56 | |
| 57 | |
| 58 | /* TLS support can be optionally included, either for OpenSSL or GnuTLS. The |
| 59 | latter needs a whole pile of tables. */ |
| 60 | |
| 61 | #ifdef HAVE_OPENSSL |
| 62 | #define HAVE_TLS |
| 63 | #include <openssl/crypto.h> |
| 64 | #include <openssl/x509.h> |
| 65 | #include <openssl/pem.h> |
| 66 | #include <openssl/ssl.h> |
| 67 | #include <openssl/err.h> |
| 68 | #include <openssl/rand.h> |
| 69 | #endif |
| 70 | |
| 71 | |
| 72 | #ifdef HAVE_GNUTLS |
| 73 | #define HAVE_TLS |
| 74 | #include <gnutls/gnutls.h> |
| 75 | #include <gnutls/x509.h> |
| 76 | |
| 77 | #define DH_BITS 768 |
| 78 | |
| 79 | /* Local static variables for GNUTLS */ |
| 80 | |
| 81 | static gnutls_dh_params dh_params = NULL; |
| 82 | |
| 83 | static gnutls_certificate_credentials_t x509_cred = NULL; |
| 84 | static gnutls_session tls_session = NULL; |
| 85 | |
| 86 | static int ssl_session_timeout = 200; |
| 87 | |
| 88 | /* Priorities for TLS algorithms to use. */ |
| 89 | |
| 90 | static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 }; |
| 91 | |
| 92 | static const int kx_priority[16] = { |
| 93 | GNUTLS_KX_RSA, |
| 94 | GNUTLS_KX_DHE_DSS, |
| 95 | GNUTLS_KX_DHE_RSA, |
| 96 | 0 }; |
| 97 | |
| 98 | static int default_cipher_priority[16] = { |
| 99 | GNUTLS_CIPHER_AES_256_CBC, |
| 100 | GNUTLS_CIPHER_AES_128_CBC, |
| 101 | GNUTLS_CIPHER_3DES_CBC, |
| 102 | GNUTLS_CIPHER_ARCFOUR_128, |
| 103 | 0 }; |
| 104 | |
| 105 | static const int mac_priority[16] = { |
| 106 | GNUTLS_MAC_SHA, |
| 107 | GNUTLS_MAC_MD5, |
| 108 | 0 }; |
| 109 | |
| 110 | static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 }; |
| 111 | static const int cert_type_priority[16] = { GNUTLS_CRT_X509, 0 }; |
| 112 | |
| 113 | #endif |
| 114 | |
| 115 | |
| 116 | |
| 117 | |
| 118 | /************************************************* |
| 119 | * SIGALRM handler - crash out * |
| 120 | *************************************************/ |
| 121 | |
| 122 | static void |
| 123 | sigalrm_handler_crash(int sig) |
| 124 | { |
| 125 | sig = sig; /* Keep picky compilers happy */ |
| 126 | printf("\nClient timed out\n"); |
| 127 | exit(99); |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /************************************************* |
| 132 | * SIGALRM handler - set flag * |
| 133 | *************************************************/ |
| 134 | |
| 135 | static void |
| 136 | sigalrm_handler_flag(int sig) |
| 137 | { |
| 138 | sig = sig; /* Keep picky compilers happy */ |
| 139 | sigalrm_seen = 1; |
| 140 | } |
| 141 | |
| 142 | |
| 143 | |
| 144 | /****************************************************************************/ |
| 145 | /****************************************************************************/ |
| 146 | |
| 147 | #ifdef HAVE_OPENSSL |
| 148 | /************************************************* |
| 149 | * Start an OpenSSL TLS session * |
| 150 | *************************************************/ |
| 151 | |
| 152 | int tls_start(int sock, SSL **ssl, SSL_CTX *ctx) |
| 153 | { |
| 154 | int rc; |
| 155 | static const char *sid_ctx = "exim"; |
| 156 | |
| 157 | RAND_load_file("client.c", -1); /* Not *very* random! */ |
| 158 | |
| 159 | *ssl = SSL_new (ctx); |
| 160 | SSL_set_session_id_context(*ssl, sid_ctx, strlen(sid_ctx)); |
| 161 | SSL_set_fd (*ssl, sock); |
| 162 | SSL_set_connect_state(*ssl); |
| 163 | |
| 164 | signal(SIGALRM, sigalrm_handler_flag); |
| 165 | sigalrm_seen = 0; |
| 166 | alarm(5); |
| 167 | rc = SSL_connect (*ssl); |
| 168 | alarm(0); |
| 169 | |
| 170 | if (sigalrm_seen) |
| 171 | { |
| 172 | printf("SSL_connect timed out\n"); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | if (rc <= 0) |
| 177 | { |
| 178 | ERR_print_errors_fp(stdout); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | printf("SSL connection using %s\n", SSL_get_cipher (*ssl)); |
| 183 | return 1; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /************************************************* |
| 188 | * SSL Information callback * |
| 189 | *************************************************/ |
| 190 | |
| 191 | static void |
| 192 | info_callback(SSL *s, int where, int ret) |
| 193 | { |
| 194 | where = where; |
| 195 | ret = ret; |
| 196 | printf("SSL info: %s\n", SSL_state_string_long(s)); |
| 197 | } |
| 198 | #endif |
| 199 | |
| 200 | |
| 201 | /****************************************************************************/ |
| 202 | /****************************************************************************/ |
| 203 | |
| 204 | |
| 205 | #ifdef HAVE_GNUTLS |
| 206 | /************************************************* |
| 207 | * Handle GnuTLS error * |
| 208 | *************************************************/ |
| 209 | |
| 210 | /* Called from lots of places when errors occur before actually starting to do |
| 211 | the TLS handshake, that is, while the session is still in clear. |
| 212 | |
| 213 | Argument: |
| 214 | prefix prefix text |
| 215 | err a GnuTLS error number, or 0 if local error |
| 216 | |
| 217 | Returns: doesn't - it dies |
| 218 | */ |
| 219 | |
| 220 | static void |
| 221 | gnutls_error(uschar *prefix, int err) |
| 222 | { |
| 223 | fprintf(stderr, "GnuTLS connection error: %s:", prefix); |
| 224 | if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err)); |
| 225 | fprintf(stderr, "\n"); |
| 226 | exit(1); |
| 227 | } |
| 228 | |
| 229 | |
| 230 | |
| 231 | /************************************************* |
| 232 | * Setup up DH parameters * |
| 233 | *************************************************/ |
| 234 | |
| 235 | /* For the test suite, the parameters should always be available in the spool |
| 236 | directory. */ |
| 237 | |
| 238 | static void |
| 239 | init_dh(void) |
| 240 | { |
| 241 | int fd; |
| 242 | int ret; |
| 243 | gnutls_datum m; |
| 244 | uschar filename[200]; |
| 245 | struct stat statbuf; |
| 246 | |
| 247 | /* Initialize the data structures for holding the parameters */ |
| 248 | |
| 249 | ret = gnutls_dh_params_init(&dh_params); |
| 250 | if (ret < 0) gnutls_error(US"init dh_params", ret); |
| 251 | |
| 252 | /* Open the cache file for reading and if successful, read it and set up the |
| 253 | parameters. */ |
| 254 | |
| 255 | fd = open("aux-fixed/gnutls-params", O_RDONLY, 0); |
| 256 | if (fd < 0) |
| 257 | { |
| 258 | fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno)); |
| 259 | exit(1); |
| 260 | } |
| 261 | |
| 262 | if (fstat(fd, &statbuf) < 0) |
| 263 | { |
| 264 | (void)close(fd); |
| 265 | return gnutls_error(US"TLS cache stat failed", 0); |
| 266 | } |
| 267 | |
| 268 | m.size = statbuf.st_size; |
| 269 | m.data = malloc(m.size); |
| 270 | if (m.data == NULL) |
| 271 | return gnutls_error(US"memory allocation failed", 0); |
| 272 | if (read(fd, m.data, m.size) != m.size) |
| 273 | return gnutls_error(US"TLS cache read failed", 0); |
| 274 | (void)close(fd); |
| 275 | |
| 276 | ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM); |
| 277 | if (ret < 0) return gnutls_error(US"DH params import", ret); |
| 278 | free(m.data); |
| 279 | } |
| 280 | |
| 281 | |
| 282 | |
| 283 | |
| 284 | /************************************************* |
| 285 | * Initialize for GnuTLS * |
| 286 | *************************************************/ |
| 287 | |
| 288 | /* |
| 289 | Arguments: |
| 290 | certificate certificate file |
| 291 | privatekey private key file |
| 292 | */ |
| 293 | |
| 294 | static void |
| 295 | tls_init(uschar *certificate, uschar *privatekey) |
| 296 | { |
| 297 | int rc; |
| 298 | |
| 299 | rc = gnutls_global_init(); |
| 300 | if (rc < 0) gnutls_error(US"gnutls_global_init", rc); |
| 301 | |
| 302 | /* Read D-H parameters from the cache file. */ |
| 303 | |
| 304 | init_dh(); |
| 305 | |
| 306 | /* Create the credentials structure */ |
| 307 | |
| 308 | rc = gnutls_certificate_allocate_credentials(&x509_cred); |
| 309 | if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc); |
| 310 | |
| 311 | /* Set the certificate and private keys */ |
| 312 | |
| 313 | if (certificate != NULL) |
| 314 | { |
| 315 | rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate, |
| 316 | CS privatekey, GNUTLS_X509_FMT_PEM); |
| 317 | if (rc < 0) gnutls_error("gnutls_certificate", rc); |
| 318 | } |
| 319 | |
| 320 | /* Associate the parameters with the x509 credentials structure. */ |
| 321 | |
| 322 | gnutls_certificate_set_dh_params(x509_cred, dh_params); |
| 323 | } |
| 324 | |
| 325 | |
| 326 | |
| 327 | /************************************************* |
| 328 | * Initialize a single GNUTLS session * |
| 329 | *************************************************/ |
| 330 | |
| 331 | static gnutls_session |
| 332 | tls_session_init(void) |
| 333 | { |
| 334 | gnutls_session session; |
| 335 | |
| 336 | gnutls_init(&session, GNUTLS_CLIENT); |
| 337 | |
| 338 | gnutls_cipher_set_priority(session, default_cipher_priority); |
| 339 | gnutls_compression_set_priority(session, comp_priority); |
| 340 | gnutls_kx_set_priority(session, kx_priority); |
| 341 | gnutls_protocol_set_priority(session, protocol_priority); |
| 342 | gnutls_mac_set_priority(session, mac_priority); |
| 343 | |
| 344 | gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred); |
| 345 | |
| 346 | gnutls_dh_set_prime_bits(session, DH_BITS); |
| 347 | gnutls_db_set_cache_expiration(session, ssl_session_timeout); |
| 348 | |
| 349 | return session; |
| 350 | } |
| 351 | #endif |
| 352 | |
| 353 | |
| 354 | /****************************************************************************/ |
| 355 | /****************************************************************************/ |
| 356 | |
| 357 | |
| 358 | |
| 359 | |
| 360 | /************************************************* |
| 361 | * Main Program * |
| 362 | *************************************************/ |
| 363 | |
| 364 | const char * const HELP_MESSAGE = "\n\ |
| 365 | Usage: client\n\ |
| 366 | <IP address>\n\ |
| 367 | <port>\n\ |
| 368 | [<outgoing interface>]\n\ |
| 369 | [<cert file>]\n\ |
| 370 | [<key file>]\n\ |
| 371 | \n"; |
| 372 | |
| 373 | int main(int argc, char **argv) |
| 374 | { |
| 375 | struct sockaddr *s_ptr; |
| 376 | struct sockaddr_in s_in4; |
| 377 | char *interface = NULL; |
| 378 | char *address = NULL; |
| 379 | char *certfile = NULL; |
| 380 | char *keyfile = NULL; |
| 381 | char *end = NULL; |
| 382 | int argi = 1; |
| 383 | int host_af, port, s_len, rc, sock, save_errno; |
| 384 | int timeout = 1; |
| 385 | int tls_active = 0; |
| 386 | int sent_starttls = 0; |
| 387 | int tls_on_connect = 0; |
| 388 | long tmplong; |
| 389 | |
| 390 | #if HAVE_IPV6 |
| 391 | struct sockaddr_in6 s_in6; |
| 392 | #endif |
| 393 | |
| 394 | #ifdef HAVE_OPENSSL |
| 395 | SSL_CTX* ctx; |
| 396 | SSL* ssl; |
| 397 | #endif |
| 398 | |
| 399 | unsigned char outbuffer[10240]; |
| 400 | unsigned char inbuffer[10240]; |
| 401 | unsigned char *inptr = inbuffer; |
| 402 | |
| 403 | *inptr = 0; /* Buffer empty */ |
| 404 | |
| 405 | /* Options */ |
| 406 | |
| 407 | while (argc >= argi + 1 && argv[argi][0] == '-') |
| 408 | { |
| 409 | if (strcmp(argv[argi], "-help") == 0 || |
| 410 | strcmp(argv[argi], "--help") == 0 || |
| 411 | strcmp(argv[argi], "-h") == 0) |
| 412 | { |
| 413 | printf(HELP_MESSAGE); |
| 414 | exit(0); |
| 415 | } |
| 416 | if (strcmp(argv[argi], "-tls-on-connect") == 0) |
| 417 | { |
| 418 | tls_on_connect = 1; |
| 419 | argi++; |
| 420 | } |
| 421 | else if (argv[argi][1] == 't' && isdigit(argv[argi][2])) |
| 422 | { |
| 423 | tmplong = strtol(argv[argi]+2, &end, 10); |
| 424 | if (end == argv[argi]+2 || *end) |
| 425 | { |
| 426 | fprintf(stderr, "Failed to parse seconds from option <%s>\n", |
| 427 | argv[argi]); |
| 428 | exit(1); |
| 429 | } |
| 430 | if (tmplong > 10000L) |
| 431 | { |
| 432 | fprintf(stderr, "Unreasonably long wait of %d seconds requested\n", |
| 433 | tmplong); |
| 434 | exit(1); |
| 435 | } |
| 436 | if (tmplong < 0L) |
| 437 | { |
| 438 | fprintf(stderr, "Timeout must not be negative (%d)\n", tmplong); |
| 439 | exit(1); |
| 440 | } |
| 441 | timeout = (int) tmplong; |
| 442 | argi++; |
| 443 | } |
| 444 | else |
| 445 | { |
| 446 | fprintf(stderr, "Unrecognized option %s\n", argv[argi]); |
| 447 | exit(1); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /* Mandatory 1st arg is IP address */ |
| 452 | |
| 453 | if (argc < argi+1) |
| 454 | { |
| 455 | fprintf(stderr, "No IP address given\n"); |
| 456 | exit(1); |
| 457 | } |
| 458 | |
| 459 | address = argv[argi++]; |
| 460 | host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET; |
| 461 | |
| 462 | /* Mandatory 2nd arg is port */ |
| 463 | |
| 464 | if (argc < argi+1) |
| 465 | { |
| 466 | fprintf(stderr, "No port number given\n"); |
| 467 | exit(1); |
| 468 | } |
| 469 | |
| 470 | port = atoi(argv[argi++]); |
| 471 | |
| 472 | /* Optional next arg is interface */ |
| 473 | |
| 474 | if (argc > argi && |
| 475 | (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':')) |
| 476 | interface = argv[argi++]; |
| 477 | |
| 478 | /* Any more arguments are the name of a certificate file and key file */ |
| 479 | |
| 480 | if (argc > argi) certfile = argv[argi++]; |
| 481 | if (argc > argi) keyfile = argv[argi++]; |
| 482 | |
| 483 | |
| 484 | #if HAVE_IPV6 |
| 485 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ |
| 486 | |
| 487 | if (host_af == AF_INET6) |
| 488 | { |
| 489 | s_ptr = (struct sockaddr *)&s_in6; |
| 490 | s_len = sizeof(s_in6); |
| 491 | } |
| 492 | else |
| 493 | #endif |
| 494 | |
| 495 | /* For an IPv4 address, use an IPv4 sockaddr structure, |
| 496 | even on an IPv6 system. */ |
| 497 | |
| 498 | { |
| 499 | s_ptr = (struct sockaddr *)&s_in4; |
| 500 | s_len = sizeof(s_in4); |
| 501 | } |
| 502 | |
| 503 | printf("Connecting to %s port %d ... ", address, port); |
| 504 | |
| 505 | sock = socket(host_af, SOCK_STREAM, 0); |
| 506 | if (sock < 0) |
| 507 | { |
| 508 | printf("socket creation failed: %s\n", strerror(errno)); |
| 509 | exit(1); |
| 510 | } |
| 511 | |
| 512 | /* Bind to a specific interface if requested. On an IPv6 system, this has |
| 513 | to be of the same family as the address we are calling. On an IPv4 system the |
| 514 | test is redundant, but it keeps the code tidier. */ |
| 515 | |
| 516 | if (interface != NULL) |
| 517 | { |
| 518 | int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET; |
| 519 | |
| 520 | if (interface_af == host_af) |
| 521 | { |
| 522 | #if HAVE_IPV6 |
| 523 | |
| 524 | /* Set up for IPv6 binding */ |
| 525 | |
| 526 | if (host_af == AF_INET6) |
| 527 | { |
| 528 | memset(&s_in6, 0, sizeof(s_in6)); |
| 529 | s_in6.sin6_family = AF_INET6; |
| 530 | s_in6.sin6_port = 0; |
| 531 | if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1) |
| 532 | { |
| 533 | printf("Unable to parse \"%s\"", interface); |
| 534 | exit(1); |
| 535 | } |
| 536 | } |
| 537 | else |
| 538 | #endif |
| 539 | |
| 540 | /* Set up for IPv4 binding */ |
| 541 | |
| 542 | { |
| 543 | memset(&s_in4, 0, sizeof(s_in4)); |
| 544 | s_in4.sin_family = AF_INET; |
| 545 | s_in4.sin_port = 0; |
| 546 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface); |
| 547 | } |
| 548 | |
| 549 | /* Bind */ |
| 550 | |
| 551 | if (bind(sock, s_ptr, s_len) < 0) |
| 552 | { |
| 553 | printf("Unable to bind outgoing SMTP call to %s: %s", |
| 554 | interface, strerror(errno)); |
| 555 | exit(1); |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | /* Set up a remote IPv6 address */ |
| 561 | |
| 562 | #if HAVE_IPV6 |
| 563 | if (host_af == AF_INET6) |
| 564 | { |
| 565 | memset(&s_in6, 0, sizeof(s_in6)); |
| 566 | s_in6.sin6_family = AF_INET6; |
| 567 | s_in6.sin6_port = htons(port); |
| 568 | if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1) |
| 569 | { |
| 570 | printf("Unable to parse \"%s\"", address); |
| 571 | exit(1); |
| 572 | } |
| 573 | } |
| 574 | else |
| 575 | #endif |
| 576 | |
| 577 | /* Set up a remote IPv4 address */ |
| 578 | |
| 579 | { |
| 580 | memset(&s_in4, 0, sizeof(s_in4)); |
| 581 | s_in4.sin_family = AF_INET; |
| 582 | s_in4.sin_port = htons(port); |
| 583 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address); |
| 584 | } |
| 585 | |
| 586 | /* SIGALRM handler crashes out */ |
| 587 | |
| 588 | signal(SIGALRM, sigalrm_handler_crash); |
| 589 | alarm(timeout); |
| 590 | rc = connect(sock, s_ptr, s_len); |
| 591 | save_errno = errno; |
| 592 | alarm(0); |
| 593 | |
| 594 | /* A failure whose error code is "Interrupted system call" is in fact |
| 595 | an externally applied timeout if the signal handler has been run. */ |
| 596 | |
| 597 | if (rc < 0) |
| 598 | { |
| 599 | close(sock); |
| 600 | printf("failed: %s\n", strerror(save_errno)); |
| 601 | exit(1); |
| 602 | } |
| 603 | |
| 604 | printf("connected\n"); |
| 605 | |
| 606 | |
| 607 | /* --------------- Set up for OpenSSL --------------- */ |
| 608 | |
| 609 | #ifdef HAVE_OPENSSL |
| 610 | SSL_library_init(); |
| 611 | SSL_load_error_strings(); |
| 612 | |
| 613 | ctx = SSL_CTX_new(SSLv23_method()); |
| 614 | if (ctx == NULL) |
| 615 | { |
| 616 | printf ("SSL_CTX_new failed\n"); |
| 617 | exit(1); |
| 618 | } |
| 619 | |
| 620 | if (certfile != NULL) |
| 621 | { |
| 622 | if (!SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM)) |
| 623 | { |
| 624 | printf("SSL_CTX_use_certificate_file failed\n"); |
| 625 | exit(1); |
| 626 | } |
| 627 | printf("Certificate file = %s\n", certfile); |
| 628 | } |
| 629 | |
| 630 | if (keyfile != NULL) |
| 631 | { |
| 632 | if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM)) |
| 633 | { |
| 634 | printf("SSL_CTX_use_PrivateKey_file failed\n"); |
| 635 | exit(1); |
| 636 | } |
| 637 | printf("Key file = %s\n", keyfile); |
| 638 | } |
| 639 | |
| 640 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); |
| 641 | SSL_CTX_set_timeout(ctx, 200); |
| 642 | SSL_CTX_set_info_callback(ctx, (void (*)())info_callback); |
| 643 | #endif |
| 644 | |
| 645 | |
| 646 | /* --------------- Set up for GnuTLS --------------- */ |
| 647 | |
| 648 | #ifdef HAVE_GNUTLS |
| 649 | if (certfile != NULL) printf("Certificate file = %s\n", certfile); |
| 650 | if (keyfile != NULL) printf("Key file = %s\n", keyfile); |
| 651 | tls_init(certfile, keyfile); |
| 652 | tls_session = tls_session_init(); |
| 653 | gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr)sock); |
| 654 | |
| 655 | /* When the server asks for a certificate and the client does not have one, |
| 656 | there is a SIGPIPE error in the gnutls_handshake() function for some reason |
| 657 | that is not understood. As luck would have it, this has never hit Exim itself |
| 658 | because it ignores SIGPIPE errors. Doing the same here allows it all to work as |
| 659 | one wants. */ |
| 660 | |
| 661 | signal(SIGPIPE, SIG_IGN); |
| 662 | #endif |
| 663 | |
| 664 | /* ---------------------------------------------- */ |
| 665 | |
| 666 | |
| 667 | /* Start TLS session if configured to do so without STARTTLS */ |
| 668 | |
| 669 | #ifdef HAVE_TLS |
| 670 | if (tls_on_connect) |
| 671 | { |
| 672 | printf("Attempting to start TLS\n"); |
| 673 | |
| 674 | #ifdef HAVE_OPENSSL |
| 675 | tls_active = tls_start(sock, &ssl, ctx); |
| 676 | #endif |
| 677 | |
| 678 | #ifdef HAVE_GNUTLS |
| 679 | sigalrm_seen = FALSE; |
| 680 | alarm(timeout); |
| 681 | tls_active = gnutls_handshake(tls_session) >= 0; |
| 682 | alarm(0); |
| 683 | #endif |
| 684 | |
| 685 | if (!tls_active) |
| 686 | printf("Failed to start TLS\n"); |
| 687 | else |
| 688 | printf("Succeeded in starting TLS\n"); |
| 689 | } |
| 690 | #endif |
| 691 | |
| 692 | while (fgets(outbuffer, sizeof(outbuffer), stdin) != NULL) |
| 693 | { |
| 694 | int n = (int)strlen(outbuffer); |
| 695 | while (n > 0 && isspace(outbuffer[n-1])) n--; |
| 696 | outbuffer[n] = 0; |
| 697 | |
| 698 | /* Expect incoming */ |
| 699 | |
| 700 | if (strncmp(outbuffer, "??? ", 4) == 0) |
| 701 | { |
| 702 | unsigned char *lineptr; |
| 703 | printf("%s\n", outbuffer); |
| 704 | |
| 705 | if (*inptr == 0) /* Refill input buffer */ |
| 706 | { |
| 707 | if (tls_active) |
| 708 | { |
| 709 | #ifdef HAVE_OPENSSL |
| 710 | rc = SSL_read (ssl, inbuffer, sizeof(inbuffer) - 1); |
| 711 | #endif |
| 712 | #ifdef HAVE_GNUTLS |
| 713 | rc = gnutls_record_recv(tls_session, CS inbuffer, sizeof(inbuffer) - 1); |
| 714 | #endif |
| 715 | } |
| 716 | else |
| 717 | { |
| 718 | alarm(timeout); |
| 719 | rc = read(sock, inbuffer, sizeof(inbuffer)); |
| 720 | alarm(0); |
| 721 | } |
| 722 | |
| 723 | if (rc < 0) |
| 724 | { |
| 725 | printf("Read error %s\n", strerror(errno)); |
| 726 | exit(1) ; |
| 727 | } |
| 728 | else if (rc == 0) |
| 729 | { |
| 730 | printf("Unexpected EOF read\n"); |
| 731 | close(sock); |
| 732 | exit(1); |
| 733 | } |
| 734 | else |
| 735 | { |
| 736 | inbuffer[rc] = 0; |
| 737 | inptr = inbuffer; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | lineptr = inptr; |
| 742 | while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++; |
| 743 | if (*inptr != 0) |
| 744 | { |
| 745 | *inptr++ = 0; |
| 746 | if (*inptr == '\n') inptr++; |
| 747 | } |
| 748 | |
| 749 | printf("<<< %s\n", lineptr); |
| 750 | if (strncmp(lineptr, outbuffer + 4, (int)strlen(outbuffer) - 4) != 0) |
| 751 | { |
| 752 | printf("\n******** Input mismatch ********\n"); |
| 753 | exit(1); |
| 754 | } |
| 755 | |
| 756 | #ifdef HAVE_TLS |
| 757 | if (sent_starttls) |
| 758 | { |
| 759 | if (lineptr[0] == '2') |
| 760 | { |
| 761 | printf("Attempting to start TLS\n"); |
| 762 | fflush(stdout); |
| 763 | |
| 764 | #ifdef HAVE_OPENSSL |
| 765 | tls_active = tls_start(sock, &ssl, ctx); |
| 766 | #endif |
| 767 | |
| 768 | #ifdef HAVE_GNUTLS |
| 769 | sigalrm_seen = FALSE; |
| 770 | alarm(timeout); |
| 771 | tls_active = gnutls_handshake(tls_session) >= 0; |
| 772 | alarm(0); |
| 773 | #endif |
| 774 | |
| 775 | if (!tls_active) |
| 776 | { |
| 777 | printf("Failed to start TLS\n"); |
| 778 | fflush(stdout); |
| 779 | } |
| 780 | else |
| 781 | printf("Succeeded in starting TLS\n"); |
| 782 | } |
| 783 | else printf("Abandoning TLS start attempt\n"); |
| 784 | } |
| 785 | sent_starttls = 0; |
| 786 | #endif |
| 787 | } |
| 788 | |
| 789 | /* Wait for a bit before proceeding */ |
| 790 | |
| 791 | else if (strncmp(outbuffer, "+++ ", 4) == 0) |
| 792 | { |
| 793 | printf("%s\n", outbuffer); |
| 794 | sleep(atoi(outbuffer + 4)); |
| 795 | } |
| 796 | |
| 797 | /* Send outgoing, but barf if unconsumed incoming */ |
| 798 | |
| 799 | else |
| 800 | { |
| 801 | unsigned char *escape; |
| 802 | |
| 803 | if (*inptr != 0) |
| 804 | { |
| 805 | printf("Unconsumed input: %s", inptr); |
| 806 | printf(" About to send: %s\n", outbuffer); |
| 807 | exit(1); |
| 808 | } |
| 809 | |
| 810 | #ifdef HAVE_TLS |
| 811 | |
| 812 | /* Shutdown TLS */ |
| 813 | |
| 814 | if (strcmp(outbuffer, "stoptls") == 0 || |
| 815 | strcmp(outbuffer, "STOPTLS") == 0) |
| 816 | { |
| 817 | if (!tls_active) |
| 818 | { |
| 819 | printf("STOPTLS read when TLS not active\n"); |
| 820 | exit(1); |
| 821 | } |
| 822 | printf("Shutting down TLS encryption\n"); |
| 823 | |
| 824 | #ifdef HAVE_OPENSSL |
| 825 | SSL_shutdown(ssl); |
| 826 | SSL_free(ssl); |
| 827 | #endif |
| 828 | |
| 829 | #ifdef HAVE_GNUTLS |
| 830 | gnutls_bye(tls_session, GNUTLS_SHUT_WR); |
| 831 | gnutls_deinit(tls_session); |
| 832 | tls_session = NULL; |
| 833 | gnutls_global_deinit(); |
| 834 | #endif |
| 835 | |
| 836 | tls_active = 0; |
| 837 | continue; |
| 838 | } |
| 839 | |
| 840 | /* Remember that we sent STARTTLS */ |
| 841 | |
| 842 | sent_starttls = (strcmp(outbuffer, "starttls") == 0 || |
| 843 | strcmp(outbuffer, "STARTTLS") == 0); |
| 844 | |
| 845 | /* Fudge: if the command is "starttls_wait", we send the starttls bit, |
| 846 | but we haven't set the flag, so that there is no negotiation. This is for |
| 847 | testing the server's timeout. */ |
| 848 | |
| 849 | if (strcmp(outbuffer, "starttls_wait") == 0) |
| 850 | { |
| 851 | outbuffer[8] = 0; |
| 852 | n = 8; |
| 853 | } |
| 854 | #endif |
| 855 | |
| 856 | printf(">>> %s\n", outbuffer); |
| 857 | strcpy(outbuffer + n, "\r\n"); |
| 858 | |
| 859 | /* Turn "\n" and "\r" into the relevant characters. This is a hack. */ |
| 860 | |
| 861 | while ((escape = strstr(outbuffer, "\\r")) != NULL) |
| 862 | { |
| 863 | *escape = '\r'; |
| 864 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); |
| 865 | n--; |
| 866 | } |
| 867 | |
| 868 | while ((escape = strstr(outbuffer, "\\n")) != NULL) |
| 869 | { |
| 870 | *escape = '\n'; |
| 871 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); |
| 872 | n--; |
| 873 | } |
| 874 | |
| 875 | /* OK, do it */ |
| 876 | |
| 877 | alarm(timeout); |
| 878 | if (tls_active) |
| 879 | { |
| 880 | #ifdef HAVE_OPENSSL |
| 881 | rc = SSL_write (ssl, outbuffer, n + 2); |
| 882 | #endif |
| 883 | #ifdef HAVE_GNUTLS |
| 884 | rc = gnutls_record_send(tls_session, CS outbuffer, n + 2); |
| 885 | if (rc < 0) |
| 886 | { |
| 887 | printf("GnuTLS write error: %s\n", gnutls_strerror(rc)); |
| 888 | exit(1); |
| 889 | } |
| 890 | #endif |
| 891 | } |
| 892 | else |
| 893 | { |
| 894 | rc = write(sock, outbuffer, n + 2); |
| 895 | } |
| 896 | alarm(0); |
| 897 | |
| 898 | if (rc < 0) |
| 899 | { |
| 900 | printf("Write error: %s\n", strerror(errno)); |
| 901 | exit(1); |
| 902 | } |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | printf("End of script\n"); |
| 907 | close(sock); |
| 908 | |
| 909 | exit(0); |
| 910 | } |
| 911 | |
| 912 | /* End of client.c */ |