| 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 */ |