| 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 | #ifdef AF_INET6 |
| 40 | #define HAVE_IPV6 1 |
| 41 | #endif |
| 42 | |
| 43 | #ifndef S_ADDR_TYPE |
| 44 | #define S_ADDR_TYPE u_long |
| 45 | #endif |
| 46 | |
| 47 | typedef unsigned char uschar; |
| 48 | |
| 49 | #define CS (char *) |
| 50 | #define US (unsigned char *) |
| 51 | |
| 52 | #define FALSE 0 |
| 53 | #define TRUE 1 |
| 54 | |
| 55 | |
| 56 | |
| 57 | static int sigalrm_seen = 0; |
| 58 | |
| 59 | |
| 60 | /* TLS support can be optionally included, either for OpenSSL or GnuTLS. The |
| 61 | latter needs a whole pile of tables. */ |
| 62 | #ifdef HAVE_OPENSSL |
| 63 | # define HAVE_TLS |
| 64 | # include <openssl/crypto.h> |
| 65 | # include <openssl/x509.h> |
| 66 | # include <openssl/pem.h> |
| 67 | # include <openssl/ssl.h> |
| 68 | # include <openssl/err.h> |
| 69 | # include <openssl/rand.h> |
| 70 | |
| 71 | # if OPENSSL_VERSION_NUMBER < 0x0090806fL && !defined(DISABLE_OCSP) && !defined(OPENSSL_NO_TLSEXT) |
| 72 | # warning "OpenSSL library version too old; define DISABLE_OCSP in Makefile" |
| 73 | # define DISABLE_OCSP |
| 74 | # endif |
| 75 | # ifndef DISABLE_OCSP |
| 76 | # include <openssl/ocsp.h> |
| 77 | # endif |
| 78 | #endif |
| 79 | |
| 80 | |
| 81 | #ifdef HAVE_GNUTLS |
| 82 | # define HAVE_TLS |
| 83 | # include <gnutls/gnutls.h> |
| 84 | # include <gnutls/x509.h> |
| 85 | # if GNUTLS_VERSION_NUMBER >= 0x030103 |
| 86 | # define HAVE_OCSP |
| 87 | # include <gnutls/ocsp.h> |
| 88 | # endif |
| 89 | # ifndef GNUTLS_NO_EXTENSIONS |
| 90 | # define GNUTLS_NO_EXTENSIONS 0 |
| 91 | # endif |
| 92 | |
| 93 | # define DH_BITS 768 |
| 94 | |
| 95 | /* Local static variables for GNUTLS */ |
| 96 | |
| 97 | static gnutls_dh_params_t dh_params = NULL; |
| 98 | |
| 99 | static gnutls_certificate_credentials_t x509_cred = NULL; |
| 100 | static gnutls_session_t tls_session = NULL; |
| 101 | |
| 102 | static int ssl_session_timeout = 200; |
| 103 | |
| 104 | /* Priorities for TLS algorithms to use. */ |
| 105 | |
| 106 | #if GNUTLS_VERSION_NUMBER < 0x030400 |
| 107 | static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 }; |
| 108 | |
| 109 | static const int kx_priority[16] = { |
| 110 | GNUTLS_KX_RSA, |
| 111 | GNUTLS_KX_DHE_DSS, |
| 112 | GNUTLS_KX_DHE_RSA, |
| 113 | 0 }; |
| 114 | |
| 115 | static int default_cipher_priority[16] = { |
| 116 | GNUTLS_CIPHER_AES_256_CBC, |
| 117 | GNUTLS_CIPHER_AES_128_CBC, |
| 118 | GNUTLS_CIPHER_3DES_CBC, |
| 119 | GNUTLS_CIPHER_ARCFOUR_128, |
| 120 | 0 }; |
| 121 | |
| 122 | static const int mac_priority[16] = { |
| 123 | GNUTLS_MAC_SHA, |
| 124 | GNUTLS_MAC_MD5, |
| 125 | 0 }; |
| 126 | |
| 127 | static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 }; |
| 128 | #endif |
| 129 | |
| 130 | #endif /*HAVE_GNUTLS*/ |
| 131 | |
| 132 | |
| 133 | |
| 134 | #ifdef HAVE_TLS |
| 135 | char * ocsp_stapling = NULL; |
| 136 | #endif |
| 137 | |
| 138 | |
| 139 | /************************************************* |
| 140 | * SIGALRM handler - crash out * |
| 141 | *************************************************/ |
| 142 | |
| 143 | static void |
| 144 | sigalrm_handler_crash(int sig) |
| 145 | { |
| 146 | sig = sig; /* Keep picky compilers happy */ |
| 147 | printf("\nClient timed out\n"); |
| 148 | exit(99); |
| 149 | } |
| 150 | |
| 151 | |
| 152 | /************************************************* |
| 153 | * SIGALRM handler - set flag * |
| 154 | *************************************************/ |
| 155 | |
| 156 | static void |
| 157 | sigalrm_handler_flag(int sig) |
| 158 | { |
| 159 | sig = sig; /* Keep picky compilers happy */ |
| 160 | sigalrm_seen = 1; |
| 161 | } |
| 162 | |
| 163 | |
| 164 | |
| 165 | /****************************************************************************/ |
| 166 | /****************************************************************************/ |
| 167 | |
| 168 | #ifdef HAVE_OPENSSL |
| 169 | # ifndef DISABLE_OCSP |
| 170 | |
| 171 | static STACK_OF(X509) * |
| 172 | chain_from_pem_file(const uschar * file) |
| 173 | { |
| 174 | BIO * bp; |
| 175 | X509 * x; |
| 176 | STACK_OF(X509) * sk; |
| 177 | |
| 178 | if (!(sk = sk_X509_new_null())) return NULL; |
| 179 | if (!(bp = BIO_new_file(CS file, "r"))) return NULL; |
| 180 | while ((x = PEM_read_bio_X509(bp, NULL, 0, NULL))) |
| 181 | sk_X509_push(sk, x); |
| 182 | BIO_free(bp); |
| 183 | return sk; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | |
| 188 | static void |
| 189 | cert_stack_free(STACK_OF(X509) * sk) |
| 190 | { |
| 191 | while (sk_X509_num(sk) > 0) (void) sk_X509_pop(sk); |
| 192 | sk_X509_free(sk); |
| 193 | } |
| 194 | |
| 195 | |
| 196 | static int |
| 197 | tls_client_stapling_cb(SSL *s, void *arg) |
| 198 | { |
| 199 | const unsigned char *p; |
| 200 | int len; |
| 201 | OCSP_RESPONSE *rsp; |
| 202 | OCSP_BASICRESP *bs; |
| 203 | STACK_OF(X509) * sk; |
| 204 | int ret = 1; |
| 205 | |
| 206 | len = SSL_get_tlsext_status_ocsp_resp(s, &p); |
| 207 | /*BIO_printf(arg, "OCSP response: ");*/ |
| 208 | if (!p) |
| 209 | { |
| 210 | BIO_printf(arg, "no response received\n"); |
| 211 | return 1; |
| 212 | } |
| 213 | if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len))) |
| 214 | { |
| 215 | BIO_printf(arg, "response parse error\n"); |
| 216 | BIO_dump_indent(arg, (char *)p, len, 4); |
| 217 | return 0; |
| 218 | } |
| 219 | if(!(bs = OCSP_response_get1_basic(rsp))) |
| 220 | { |
| 221 | BIO_printf(arg, "error parsing response\n"); |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | |
| 226 | if (!(sk = chain_from_pem_file(ocsp_stapling))) |
| 227 | { |
| 228 | BIO_printf(arg, "error in cert setup\n"); |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* OCSP_basic_verify takes a "store" arg, but does not |
| 233 | use it for the chain verification, which is all we do |
| 234 | when OCSP_NOVERIFY is set. The content from the wire |
| 235 | (in "bs") and a cert-stack "sk" are all that is used. */ |
| 236 | |
| 237 | if(OCSP_basic_verify(bs, sk, NULL, OCSP_NOVERIFY) <= 0) |
| 238 | { |
| 239 | BIO_printf(arg, "Response Verify Failure\n"); |
| 240 | ERR_print_errors(arg); |
| 241 | ret = 0; |
| 242 | } |
| 243 | else |
| 244 | BIO_printf(arg, "Response verify OK\n"); |
| 245 | |
| 246 | cert_stack_free(sk); |
| 247 | return ret; |
| 248 | } |
| 249 | # endif /*DISABLE_OCSP*/ |
| 250 | |
| 251 | |
| 252 | /************************************************* |
| 253 | * Start an OpenSSL TLS session * |
| 254 | *************************************************/ |
| 255 | |
| 256 | int |
| 257 | tls_start(int sock, SSL **ssl, SSL_CTX *ctx) |
| 258 | { |
| 259 | int rc; |
| 260 | static const unsigned char *sid_ctx = US"exim"; |
| 261 | |
| 262 | RAND_load_file("client.c", -1); /* Not *very* random! */ |
| 263 | |
| 264 | *ssl = SSL_new (ctx); |
| 265 | SSL_set_session_id_context(*ssl, sid_ctx, strlen(CS sid_ctx)); |
| 266 | SSL_set_fd (*ssl, sock); |
| 267 | SSL_set_connect_state(*ssl); |
| 268 | |
| 269 | #ifndef DISABLE_OCSP |
| 270 | if (ocsp_stapling) |
| 271 | { |
| 272 | SSL_CTX_set_tlsext_status_cb(ctx, tls_client_stapling_cb); |
| 273 | SSL_CTX_set_tlsext_status_arg(ctx, BIO_new_fp(stdout, BIO_NOCLOSE)); |
| 274 | SSL_set_tlsext_status_type(*ssl, TLSEXT_STATUSTYPE_ocsp); |
| 275 | } |
| 276 | #endif |
| 277 | |
| 278 | signal(SIGALRM, sigalrm_handler_flag); |
| 279 | sigalrm_seen = 0; |
| 280 | alarm(5); |
| 281 | rc = SSL_connect (*ssl); |
| 282 | alarm(0); |
| 283 | |
| 284 | if (sigalrm_seen) |
| 285 | { |
| 286 | printf("SSL_connect timed out\n"); |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | if (rc <= 0) |
| 291 | { |
| 292 | ERR_print_errors_fp(stdout); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | printf("SSL connection using %s\n", SSL_get_cipher (*ssl)); |
| 297 | return 1; |
| 298 | } |
| 299 | |
| 300 | |
| 301 | /************************************************* |
| 302 | * SSL Information callback * |
| 303 | *************************************************/ |
| 304 | |
| 305 | static void |
| 306 | info_callback(SSL *s, int where, int ret) |
| 307 | { |
| 308 | where = where; |
| 309 | ret = ret; |
| 310 | printf("SSL info: %s\n", SSL_state_string_long(s)); |
| 311 | } |
| 312 | #endif |
| 313 | |
| 314 | |
| 315 | /****************************************************************************/ |
| 316 | /****************************************************************************/ |
| 317 | |
| 318 | |
| 319 | #ifdef HAVE_GNUTLS |
| 320 | /************************************************* |
| 321 | * Handle GnuTLS error * |
| 322 | *************************************************/ |
| 323 | |
| 324 | /* Called from lots of places when errors occur before actually starting to do |
| 325 | the TLS handshake, that is, while the session is still in clear. |
| 326 | |
| 327 | Argument: |
| 328 | prefix prefix text |
| 329 | err a GnuTLS error number, or 0 if local error |
| 330 | |
| 331 | Returns: doesn't - it dies |
| 332 | */ |
| 333 | |
| 334 | static void |
| 335 | gnutls_error(uschar *prefix, int err) |
| 336 | { |
| 337 | fprintf(stderr, "GnuTLS connection error: %s:", prefix); |
| 338 | if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err)); |
| 339 | fprintf(stderr, "\n"); |
| 340 | exit(98); |
| 341 | } |
| 342 | |
| 343 | |
| 344 | |
| 345 | /************************************************* |
| 346 | * Setup up DH parameters * |
| 347 | *************************************************/ |
| 348 | |
| 349 | /* For the test suite, the parameters should always be available in the spool |
| 350 | directory. */ |
| 351 | |
| 352 | static void |
| 353 | init_dh(void) |
| 354 | { |
| 355 | int fd; |
| 356 | int ret; |
| 357 | gnutls_datum_t m; |
| 358 | uschar filename[200]; |
| 359 | struct stat statbuf; |
| 360 | |
| 361 | /* Initialize the data structures for holding the parameters */ |
| 362 | |
| 363 | ret = gnutls_dh_params_init(&dh_params); |
| 364 | if (ret < 0) gnutls_error(US"init dh_params", ret); |
| 365 | |
| 366 | /* Open the cache file for reading and if successful, read it and set up the |
| 367 | parameters. */ |
| 368 | |
| 369 | fd = open("aux-fixed/gnutls-params", O_RDONLY, 0); |
| 370 | if (fd < 0) |
| 371 | { |
| 372 | fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno)); |
| 373 | exit(97); |
| 374 | } |
| 375 | |
| 376 | if (fstat(fd, &statbuf) < 0) |
| 377 | { |
| 378 | (void)close(fd); |
| 379 | return gnutls_error(US"TLS cache stat failed", 0); |
| 380 | } |
| 381 | |
| 382 | m.size = statbuf.st_size; |
| 383 | m.data = malloc(m.size); |
| 384 | if (m.data == NULL) |
| 385 | return gnutls_error(US"memory allocation failed", 0); |
| 386 | if (read(fd, m.data, m.size) != m.size) |
| 387 | return gnutls_error(US"TLS cache read failed", 0); |
| 388 | (void)close(fd); |
| 389 | |
| 390 | ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM); |
| 391 | if (ret < 0) return gnutls_error(US"DH params import", ret); |
| 392 | free(m.data); |
| 393 | } |
| 394 | |
| 395 | |
| 396 | |
| 397 | |
| 398 | /************************************************* |
| 399 | * Initialize for GnuTLS * |
| 400 | *************************************************/ |
| 401 | |
| 402 | /* |
| 403 | Arguments: |
| 404 | certificate certificate file |
| 405 | privatekey private key file |
| 406 | */ |
| 407 | |
| 408 | static void |
| 409 | tls_init(uschar *certificate, uschar *privatekey) |
| 410 | { |
| 411 | int rc; |
| 412 | |
| 413 | rc = gnutls_global_init(); |
| 414 | if (rc < 0) gnutls_error(US"gnutls_global_init", rc); |
| 415 | |
| 416 | /* Read D-H parameters from the cache file. */ |
| 417 | |
| 418 | init_dh(); |
| 419 | |
| 420 | /* Create the credentials structure */ |
| 421 | |
| 422 | rc = gnutls_certificate_allocate_credentials(&x509_cred); |
| 423 | if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc); |
| 424 | |
| 425 | /* Set the certificate and private keys */ |
| 426 | |
| 427 | if (certificate != NULL) |
| 428 | { |
| 429 | rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate, |
| 430 | CS privatekey, GNUTLS_X509_FMT_PEM); |
| 431 | if (rc < 0) gnutls_error("gnutls_certificate", rc); |
| 432 | } |
| 433 | |
| 434 | /* Associate the parameters with the x509 credentials structure. */ |
| 435 | |
| 436 | gnutls_certificate_set_dh_params(x509_cred, dh_params); |
| 437 | |
| 438 | /* set the CA info for server-cert verify */ |
| 439 | if (ocsp_stapling) |
| 440 | gnutls_certificate_set_x509_trust_file(x509_cred, ocsp_stapling, |
| 441 | GNUTLS_X509_FMT_PEM); |
| 442 | } |
| 443 | |
| 444 | |
| 445 | |
| 446 | /************************************************* |
| 447 | * Initialize a single GNUTLS session * |
| 448 | *************************************************/ |
| 449 | |
| 450 | static gnutls_session_t |
| 451 | tls_session_init(void) |
| 452 | { |
| 453 | gnutls_session_t session; |
| 454 | |
| 455 | gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_NO_EXTENSIONS); |
| 456 | |
| 457 | #if GNUTLS_VERSION_NUMBER < 0x030400 |
| 458 | gnutls_cipher_set_priority(session, default_cipher_priority); |
| 459 | gnutls_compression_set_priority(session, comp_priority); |
| 460 | gnutls_kx_set_priority(session, kx_priority); |
| 461 | gnutls_protocol_set_priority(session, protocol_priority); |
| 462 | gnutls_mac_set_priority(session, mac_priority); |
| 463 | |
| 464 | gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred); |
| 465 | #else |
| 466 | gnutls_set_default_priority(session); |
| 467 | gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred); |
| 468 | #endif |
| 469 | |
| 470 | gnutls_dh_set_prime_bits(session, DH_BITS); |
| 471 | gnutls_db_set_cache_expiration(session, ssl_session_timeout); |
| 472 | |
| 473 | return session; |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | |
| 478 | /****************************************************************************/ |
| 479 | /****************************************************************************/ |
| 480 | |
| 481 | |
| 482 | |
| 483 | |
| 484 | /************************************************* |
| 485 | * Main Program * |
| 486 | *************************************************/ |
| 487 | |
| 488 | const char * const HELP_MESSAGE = "\n\ |
| 489 | Usage: client\n" |
| 490 | #ifdef HAVE_TLS |
| 491 | "\ |
| 492 | [-tls-on-connect]\n\ |
| 493 | [-ocsp]\n" |
| 494 | #endif |
| 495 | "\ |
| 496 | [-tn] n seconds timeout\n\ |
| 497 | <IP address>\n\ |
| 498 | <port>\n\ |
| 499 | [<outgoing interface>]\n\ |
| 500 | [<cert file>]\n\ |
| 501 | [<key file>]\n\ |
| 502 | \n"; |
| 503 | |
| 504 | int main(int argc, char **argv) |
| 505 | { |
| 506 | struct sockaddr *s_ptr; |
| 507 | struct sockaddr_in s_in4; |
| 508 | char *interface = NULL; |
| 509 | char *address = NULL; |
| 510 | char *certfile = NULL; |
| 511 | char *keyfile = NULL; |
| 512 | char *end = NULL; |
| 513 | int argi = 1; |
| 514 | int host_af, port, s_len, rc, sock, save_errno; |
| 515 | int timeout = 5; |
| 516 | int tls_active = 0; |
| 517 | int sent_starttls = 0; |
| 518 | int tls_on_connect = 0; |
| 519 | long tmplong; |
| 520 | |
| 521 | #if HAVE_IPV6 |
| 522 | struct sockaddr_in6 s_in6; |
| 523 | #endif |
| 524 | |
| 525 | #ifdef HAVE_OPENSSL |
| 526 | SSL_CTX* ctx; |
| 527 | SSL* ssl; |
| 528 | #endif |
| 529 | |
| 530 | unsigned char outbuffer[10240]; |
| 531 | unsigned char inbuffer[10240]; |
| 532 | unsigned char *inptr = inbuffer; |
| 533 | |
| 534 | *inptr = 0; /* Buffer empty */ |
| 535 | |
| 536 | /* Options */ |
| 537 | |
| 538 | while (argc >= argi + 1 && argv[argi][0] == '-') |
| 539 | { |
| 540 | if (strcmp(argv[argi], "-help") == 0 || |
| 541 | strcmp(argv[argi], "--help") == 0 || |
| 542 | strcmp(argv[argi], "-h") == 0) |
| 543 | { |
| 544 | puts(HELP_MESSAGE); |
| 545 | exit(0); |
| 546 | } |
| 547 | if (strcmp(argv[argi], "-tls-on-connect") == 0) |
| 548 | { |
| 549 | tls_on_connect = 1; |
| 550 | argi++; |
| 551 | } |
| 552 | #ifdef HAVE_TLS |
| 553 | else if (strcmp(argv[argi], "-ocsp") == 0) |
| 554 | { |
| 555 | if (argc < ++argi + 1) |
| 556 | { |
| 557 | fprintf(stderr, "Missing required certificate file for ocsp option\n"); |
| 558 | exit(96); |
| 559 | } |
| 560 | ocsp_stapling = argv[argi++]; |
| 561 | } |
| 562 | |
| 563 | #endif |
| 564 | else if (argv[argi][1] == 't' && isdigit(argv[argi][2])) |
| 565 | { |
| 566 | tmplong = strtol(argv[argi]+2, &end, 10); |
| 567 | if (end == argv[argi]+2 || *end) |
| 568 | { |
| 569 | fprintf(stderr, "Failed to parse seconds from option <%s>\n", |
| 570 | argv[argi]); |
| 571 | exit(95); |
| 572 | } |
| 573 | if (tmplong > 10000L) |
| 574 | { |
| 575 | fprintf(stderr, "Unreasonably long wait of %ld seconds requested\n", |
| 576 | tmplong); |
| 577 | exit(94); |
| 578 | } |
| 579 | if (tmplong < 0L) |
| 580 | { |
| 581 | fprintf(stderr, "Timeout must not be negative (%ld)\n", tmplong); |
| 582 | exit(93); |
| 583 | } |
| 584 | timeout = (int) tmplong; |
| 585 | argi++; |
| 586 | } |
| 587 | else |
| 588 | { |
| 589 | fprintf(stderr, "Unrecognized option %s\n", argv[argi]); |
| 590 | exit(92); |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | /* Mandatory 1st arg is IP address */ |
| 595 | |
| 596 | if (argc < argi+1) |
| 597 | { |
| 598 | fprintf(stderr, "No IP address given\n"); |
| 599 | exit(91); |
| 600 | } |
| 601 | |
| 602 | address = argv[argi++]; |
| 603 | host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET; |
| 604 | |
| 605 | /* Mandatory 2nd arg is port */ |
| 606 | |
| 607 | if (argc < argi+1) |
| 608 | { |
| 609 | fprintf(stderr, "No port number given\n"); |
| 610 | exit(90); |
| 611 | } |
| 612 | |
| 613 | port = atoi(argv[argi++]); |
| 614 | |
| 615 | /* Optional next arg is interface */ |
| 616 | |
| 617 | if (argc > argi && |
| 618 | (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':')) |
| 619 | interface = argv[argi++]; |
| 620 | |
| 621 | /* Any more arguments are the name of a certificate file and key file */ |
| 622 | |
| 623 | if (argc > argi) certfile = argv[argi++]; |
| 624 | if (argc > argi) keyfile = argv[argi++]; |
| 625 | |
| 626 | |
| 627 | #if HAVE_IPV6 |
| 628 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ |
| 629 | |
| 630 | if (host_af == AF_INET6) |
| 631 | { |
| 632 | s_ptr = (struct sockaddr *)&s_in6; |
| 633 | s_len = sizeof(s_in6); |
| 634 | } |
| 635 | else |
| 636 | #endif |
| 637 | |
| 638 | /* For an IPv4 address, use an IPv4 sockaddr structure, |
| 639 | even on an IPv6 system. */ |
| 640 | |
| 641 | { |
| 642 | s_ptr = (struct sockaddr *)&s_in4; |
| 643 | s_len = sizeof(s_in4); |
| 644 | } |
| 645 | |
| 646 | printf("Connecting to %s port %d ... ", address, port); |
| 647 | |
| 648 | sock = socket(host_af, SOCK_STREAM, 0); |
| 649 | if (sock < 0) |
| 650 | { |
| 651 | printf("socket creation failed: %s\n", strerror(errno)); |
| 652 | exit(89); |
| 653 | } |
| 654 | |
| 655 | /* Bind to a specific interface if requested. On an IPv6 system, this has |
| 656 | to be of the same family as the address we are calling. On an IPv4 system the |
| 657 | test is redundant, but it keeps the code tidier. */ |
| 658 | |
| 659 | if (interface != NULL) |
| 660 | { |
| 661 | int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET; |
| 662 | |
| 663 | if (interface_af == host_af) |
| 664 | { |
| 665 | #if HAVE_IPV6 |
| 666 | |
| 667 | /* Set up for IPv6 binding */ |
| 668 | |
| 669 | if (host_af == AF_INET6) |
| 670 | { |
| 671 | memset(&s_in6, 0, sizeof(s_in6)); |
| 672 | s_in6.sin6_family = AF_INET6; |
| 673 | s_in6.sin6_port = 0; |
| 674 | if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1) |
| 675 | { |
| 676 | printf("Unable to parse \"%s\"", interface); |
| 677 | exit(88); |
| 678 | } |
| 679 | } |
| 680 | else |
| 681 | #endif |
| 682 | |
| 683 | /* Set up for IPv4 binding */ |
| 684 | |
| 685 | { |
| 686 | memset(&s_in4, 0, sizeof(s_in4)); |
| 687 | s_in4.sin_family = AF_INET; |
| 688 | s_in4.sin_port = 0; |
| 689 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface); |
| 690 | } |
| 691 | |
| 692 | /* Bind */ |
| 693 | |
| 694 | if (bind(sock, s_ptr, s_len) < 0) |
| 695 | { |
| 696 | printf("Unable to bind outgoing SMTP call to %s: %s", |
| 697 | interface, strerror(errno)); |
| 698 | exit(87); |
| 699 | } |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | /* Set up a remote IPv6 address */ |
| 704 | |
| 705 | #if HAVE_IPV6 |
| 706 | if (host_af == AF_INET6) |
| 707 | { |
| 708 | memset(&s_in6, 0, sizeof(s_in6)); |
| 709 | s_in6.sin6_family = AF_INET6; |
| 710 | s_in6.sin6_port = htons(port); |
| 711 | if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1) |
| 712 | { |
| 713 | printf("Unable to parse \"%s\"", address); |
| 714 | exit(86); |
| 715 | } |
| 716 | } |
| 717 | else |
| 718 | #endif |
| 719 | |
| 720 | /* Set up a remote IPv4 address */ |
| 721 | |
| 722 | { |
| 723 | memset(&s_in4, 0, sizeof(s_in4)); |
| 724 | s_in4.sin_family = AF_INET; |
| 725 | s_in4.sin_port = htons(port); |
| 726 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address); |
| 727 | } |
| 728 | |
| 729 | /* SIGALRM handler crashes out */ |
| 730 | |
| 731 | signal(SIGALRM, sigalrm_handler_crash); |
| 732 | alarm(timeout); |
| 733 | rc = connect(sock, s_ptr, s_len); |
| 734 | save_errno = errno; |
| 735 | alarm(0); |
| 736 | |
| 737 | /* A failure whose error code is "Interrupted system call" is in fact |
| 738 | an externally applied timeout if the signal handler has been run. */ |
| 739 | |
| 740 | if (rc < 0) |
| 741 | { |
| 742 | close(sock); |
| 743 | printf("connect failed: %s\n", strerror(save_errno)); |
| 744 | exit(85); |
| 745 | } |
| 746 | |
| 747 | printf("connected\n"); |
| 748 | |
| 749 | |
| 750 | /* --------------- Set up for OpenSSL --------------- */ |
| 751 | |
| 752 | #ifdef HAVE_OPENSSL |
| 753 | SSL_library_init(); |
| 754 | SSL_load_error_strings(); |
| 755 | |
| 756 | ctx = SSL_CTX_new(SSLv23_method()); |
| 757 | if (ctx == NULL) |
| 758 | { |
| 759 | printf ("SSL_CTX_new failed\n"); |
| 760 | exit(84); |
| 761 | } |
| 762 | |
| 763 | if (certfile != NULL) |
| 764 | { |
| 765 | if (!SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM)) |
| 766 | { |
| 767 | printf("SSL_CTX_use_certificate_file failed\n"); |
| 768 | exit(83); |
| 769 | } |
| 770 | printf("Certificate file = %s\n", certfile); |
| 771 | } |
| 772 | |
| 773 | if (keyfile != NULL) |
| 774 | { |
| 775 | if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM)) |
| 776 | { |
| 777 | printf("SSL_CTX_use_PrivateKey_file failed\n"); |
| 778 | exit(82); |
| 779 | } |
| 780 | printf("Key file = %s\n", keyfile); |
| 781 | } |
| 782 | |
| 783 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); |
| 784 | SSL_CTX_set_timeout(ctx, 200); |
| 785 | SSL_CTX_set_info_callback(ctx, (void (*)())info_callback); |
| 786 | #endif |
| 787 | |
| 788 | |
| 789 | /* --------------- Set up for GnuTLS --------------- */ |
| 790 | |
| 791 | #ifdef HAVE_GNUTLS |
| 792 | if (certfile != NULL) printf("Certificate file = %s\n", certfile); |
| 793 | if (keyfile != NULL) printf("Key file = %s\n", keyfile); |
| 794 | tls_init(certfile, keyfile); |
| 795 | tls_session = tls_session_init(); |
| 796 | #ifdef HAVE_OCSP |
| 797 | if (ocsp_stapling) |
| 798 | gnutls_ocsp_status_request_enable_client(tls_session, NULL, 0, NULL); |
| 799 | #endif |
| 800 | gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr_t)(intptr_t)sock); |
| 801 | |
| 802 | /* When the server asks for a certificate and the client does not have one, |
| 803 | there is a SIGPIPE error in the gnutls_handshake() function for some reason |
| 804 | that is not understood. As luck would have it, this has never hit Exim itself |
| 805 | because it ignores SIGPIPE errors. Doing the same here allows it all to work as |
| 806 | one wants. */ |
| 807 | |
| 808 | signal(SIGPIPE, SIG_IGN); |
| 809 | #endif |
| 810 | |
| 811 | /* ---------------------------------------------- */ |
| 812 | |
| 813 | |
| 814 | /* Start TLS session if configured to do so without STARTTLS */ |
| 815 | |
| 816 | #ifdef HAVE_TLS |
| 817 | if (tls_on_connect) |
| 818 | { |
| 819 | printf("Attempting to start TLS\n"); |
| 820 | |
| 821 | #ifdef HAVE_OPENSSL |
| 822 | tls_active = tls_start(sock, &ssl, ctx); |
| 823 | #endif |
| 824 | |
| 825 | #ifdef HAVE_GNUTLS |
| 826 | { |
| 827 | int rc; |
| 828 | sigalrm_seen = FALSE; |
| 829 | alarm(timeout); |
| 830 | do { |
| 831 | rc = gnutls_handshake(tls_session); |
| 832 | } while (rc < 0 && gnutls_error_is_fatal(rc) == 0); |
| 833 | tls_active = rc >= 0; |
| 834 | alarm(0); |
| 835 | |
| 836 | if (!tls_active) printf("%s\n", gnutls_strerror(rc)); |
| 837 | } |
| 838 | #endif |
| 839 | |
| 840 | if (!tls_active) |
| 841 | printf("Failed to start TLS\n"); |
| 842 | #if defined(HAVE_GNUTLS) && defined(HAVE_OCSP) |
| 843 | else if ( ocsp_stapling |
| 844 | && gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0) |
| 845 | printf("Failed to verify certificate status\n"); |
| 846 | #endif |
| 847 | else |
| 848 | printf("Succeeded in starting TLS\n"); |
| 849 | } |
| 850 | #endif |
| 851 | |
| 852 | while (fgets(CS outbuffer, sizeof(outbuffer), stdin) != NULL) |
| 853 | { |
| 854 | int n = (int)strlen(CS outbuffer); |
| 855 | |
| 856 | /* Strip trailing newline */ |
| 857 | if (outbuffer[n-1] == '\n') outbuffer[--n] = 0; |
| 858 | |
| 859 | /* Expect incoming */ |
| 860 | |
| 861 | if ( strncmp(CS outbuffer, "???", 3) == 0 |
| 862 | && (outbuffer[3] == ' ' || outbuffer[3] == '*') |
| 863 | ) |
| 864 | { |
| 865 | unsigned char *lineptr; |
| 866 | unsigned exp_eof = outbuffer[3] == '*'; |
| 867 | |
| 868 | printf("%s\n", outbuffer); |
| 869 | |
| 870 | if (*inptr == 0) /* Refill input buffer */ |
| 871 | { |
| 872 | if (tls_active) |
| 873 | { |
| 874 | #ifdef HAVE_OPENSSL |
| 875 | rc = SSL_read (ssl, inbuffer, sizeof(inbuffer) - 1); |
| 876 | #endif |
| 877 | #ifdef HAVE_GNUTLS |
| 878 | rc = gnutls_record_recv(tls_session, CS inbuffer, sizeof(inbuffer) - 1); |
| 879 | #endif |
| 880 | } |
| 881 | else |
| 882 | { |
| 883 | alarm(timeout); |
| 884 | rc = read(sock, inbuffer, sizeof(inbuffer)); |
| 885 | alarm(0); |
| 886 | } |
| 887 | |
| 888 | if (rc < 0) |
| 889 | { |
| 890 | printf("Read error %s\n", strerror(errno)); |
| 891 | exit(81); |
| 892 | } |
| 893 | else if (rc == 0) |
| 894 | if (exp_eof) |
| 895 | { |
| 896 | printf("Expected EOF read\n"); |
| 897 | continue; |
| 898 | } |
| 899 | else |
| 900 | { |
| 901 | printf("Enexpected EOF read\n"); |
| 902 | close(sock); |
| 903 | exit(80); |
| 904 | } |
| 905 | else if (exp_eof) |
| 906 | { |
| 907 | printf("Expected EOF not read\n"); |
| 908 | close(sock); |
| 909 | exit(74); |
| 910 | } |
| 911 | else |
| 912 | { |
| 913 | inbuffer[rc] = 0; |
| 914 | inptr = inbuffer; |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | lineptr = inptr; |
| 919 | while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++; |
| 920 | if (*inptr != 0) |
| 921 | { |
| 922 | *inptr++ = 0; |
| 923 | if (*inptr == '\n') inptr++; |
| 924 | } |
| 925 | |
| 926 | printf("<<< %s\n", lineptr); |
| 927 | if (strncmp(CS lineptr, CS outbuffer + 4, (int)strlen(CS outbuffer) - 4) != 0) |
| 928 | { |
| 929 | printf("\n******** Input mismatch ********\n"); |
| 930 | exit(79); |
| 931 | } |
| 932 | |
| 933 | #ifdef HAVE_TLS |
| 934 | if (sent_starttls) |
| 935 | { |
| 936 | if (lineptr[0] == '2') |
| 937 | { |
| 938 | int rc; |
| 939 | unsigned int verify; |
| 940 | |
| 941 | printf("Attempting to start TLS\n"); |
| 942 | fflush(stdout); |
| 943 | |
| 944 | #ifdef HAVE_OPENSSL |
| 945 | tls_active = tls_start(sock, &ssl, ctx); |
| 946 | #endif |
| 947 | |
| 948 | #ifdef HAVE_GNUTLS |
| 949 | { |
| 950 | int rc; |
| 951 | sigalrm_seen = FALSE; |
| 952 | alarm(timeout); |
| 953 | do { |
| 954 | rc = gnutls_handshake(tls_session); |
| 955 | } while (rc < 0 && gnutls_error_is_fatal(rc) == 0); |
| 956 | tls_active = rc >= 0; |
| 957 | alarm(0); |
| 958 | |
| 959 | if (!tls_active) printf("%s\n", gnutls_strerror(rc)); |
| 960 | } |
| 961 | #endif |
| 962 | |
| 963 | if (!tls_active) |
| 964 | { |
| 965 | printf("Failed to start TLS\n"); |
| 966 | fflush(stdout); |
| 967 | } |
| 968 | #ifdef HAVE_GNUTLS |
| 969 | else if (ocsp_stapling) |
| 970 | { |
| 971 | if ((rc= gnutls_certificate_verify_peers2(tls_session, &verify)) < 0) |
| 972 | { |
| 973 | printf("Failed to verify certificate: %s\n", gnutls_strerror(rc)); |
| 974 | fflush(stdout); |
| 975 | } |
| 976 | else if (verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED)) |
| 977 | { |
| 978 | printf("Bad certificate\n"); |
| 979 | fflush(stdout); |
| 980 | } |
| 981 | #ifdef HAVE_OCSP |
| 982 | else if (gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0) |
| 983 | { |
| 984 | printf("Failed to verify certificate status\n"); |
| 985 | { |
| 986 | gnutls_datum_t stapling; |
| 987 | gnutls_ocsp_resp_t resp; |
| 988 | gnutls_datum_t printed; |
| 989 | if ( (rc= gnutls_ocsp_status_request_get(tls_session, &stapling)) == 0 |
| 990 | && (rc= gnutls_ocsp_resp_init(&resp)) == 0 |
| 991 | && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0 |
| 992 | && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0 |
| 993 | ) |
| 994 | { |
| 995 | fprintf(stderr, "%.4096s", printed.data); |
| 996 | gnutls_free(printed.data); |
| 997 | } |
| 998 | else |
| 999 | (void) fprintf(stderr,"ocsp decode: %s", gnutls_strerror(rc)); |
| 1000 | } |
| 1001 | fflush(stdout); |
| 1002 | } |
| 1003 | #endif |
| 1004 | } |
| 1005 | #endif |
| 1006 | else |
| 1007 | printf("Succeeded in starting TLS\n"); |
| 1008 | } |
| 1009 | else printf("Abandoning TLS start attempt\n"); |
| 1010 | } |
| 1011 | sent_starttls = 0; |
| 1012 | #endif |
| 1013 | } |
| 1014 | |
| 1015 | /* Wait for a bit before proceeding */ |
| 1016 | |
| 1017 | else if (strncmp(CS outbuffer, "+++ ", 4) == 0) |
| 1018 | { |
| 1019 | printf("%s\n", outbuffer); |
| 1020 | sleep(atoi(CS outbuffer + 4)); |
| 1021 | } |
| 1022 | |
| 1023 | /* Send outgoing, but barf if unconsumed incoming */ |
| 1024 | |
| 1025 | else |
| 1026 | { |
| 1027 | unsigned char *escape; |
| 1028 | |
| 1029 | if (*inptr != 0) |
| 1030 | { |
| 1031 | printf("Unconsumed input: %s", inptr); |
| 1032 | printf(" About to send: %s\n", outbuffer); |
| 1033 | exit(78); |
| 1034 | } |
| 1035 | |
| 1036 | #ifdef HAVE_TLS |
| 1037 | |
| 1038 | /* Shutdown TLS */ |
| 1039 | |
| 1040 | if (strcmp(CS outbuffer, "stoptls") == 0 || |
| 1041 | strcmp(CS outbuffer, "STOPTLS") == 0) |
| 1042 | { |
| 1043 | if (!tls_active) |
| 1044 | { |
| 1045 | printf("STOPTLS read when TLS not active\n"); |
| 1046 | exit(77); |
| 1047 | } |
| 1048 | printf("Shutting down TLS encryption\n"); |
| 1049 | |
| 1050 | #ifdef HAVE_OPENSSL |
| 1051 | SSL_shutdown(ssl); |
| 1052 | SSL_free(ssl); |
| 1053 | #endif |
| 1054 | |
| 1055 | #ifdef HAVE_GNUTLS |
| 1056 | gnutls_bye(tls_session, GNUTLS_SHUT_WR); |
| 1057 | gnutls_deinit(tls_session); |
| 1058 | tls_session = NULL; |
| 1059 | gnutls_global_deinit(); |
| 1060 | #endif |
| 1061 | |
| 1062 | tls_active = 0; |
| 1063 | continue; |
| 1064 | } |
| 1065 | |
| 1066 | /* Remember that we sent STARTTLS */ |
| 1067 | |
| 1068 | sent_starttls = (strcmp(CS outbuffer, "starttls") == 0 || |
| 1069 | strcmp(CS outbuffer, "STARTTLS") == 0); |
| 1070 | |
| 1071 | /* Fudge: if the command is "starttls_wait", we send the starttls bit, |
| 1072 | but we haven't set the flag, so that there is no negotiation. This is for |
| 1073 | testing the server's timeout. */ |
| 1074 | |
| 1075 | if (strcmp(CS outbuffer, "starttls_wait") == 0) |
| 1076 | { |
| 1077 | outbuffer[8] = 0; |
| 1078 | n = 8; |
| 1079 | } |
| 1080 | #endif |
| 1081 | |
| 1082 | printf(">>> %s\n", outbuffer); |
| 1083 | strcpy(CS outbuffer + n, "\r\n"); |
| 1084 | |
| 1085 | /* Turn "\n" and "\r" into the relevant characters. This is a hack. */ |
| 1086 | |
| 1087 | while ((escape = US strstr(CS outbuffer, "\\r")) != NULL) |
| 1088 | { |
| 1089 | *escape = '\r'; |
| 1090 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); |
| 1091 | n--; |
| 1092 | } |
| 1093 | |
| 1094 | while ((escape = US strstr(CS outbuffer, "\\n")) != NULL) |
| 1095 | { |
| 1096 | *escape = '\n'; |
| 1097 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); |
| 1098 | n--; |
| 1099 | } |
| 1100 | |
| 1101 | /* OK, do it */ |
| 1102 | |
| 1103 | alarm(timeout); |
| 1104 | if (tls_active) |
| 1105 | { |
| 1106 | #ifdef HAVE_OPENSSL |
| 1107 | rc = SSL_write (ssl, outbuffer, n + 2); |
| 1108 | #endif |
| 1109 | #ifdef HAVE_GNUTLS |
| 1110 | rc = gnutls_record_send(tls_session, CS outbuffer, n + 2); |
| 1111 | if (rc < 0) |
| 1112 | { |
| 1113 | printf("GnuTLS write error: %s\n", gnutls_strerror(rc)); |
| 1114 | exit(76); |
| 1115 | } |
| 1116 | #endif |
| 1117 | } |
| 1118 | else |
| 1119 | { |
| 1120 | rc = write(sock, outbuffer, n + 2); |
| 1121 | } |
| 1122 | alarm(0); |
| 1123 | |
| 1124 | if (rc < 0) |
| 1125 | { |
| 1126 | printf("Write error: %s\n", strerror(errno)); |
| 1127 | exit(75); |
| 1128 | } |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | printf("End of script\n"); |
| 1133 | shutdown(sock, SHUT_WR); |
| 1134 | while ((rc = read(sock, inbuffer, sizeof(inbuffer))) > 0) ; |
| 1135 | close(sock); |
| 1136 | |
| 1137 | exit(0); |
| 1138 | } |
| 1139 | |
| 1140 | /* End of client.c */ |