1 /* 2 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg, 6 * Germany. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $DragonFly: src/libexec/dma/net.c,v 1.9 2008/09/30 17:47:21 swildner Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/queue.h> 40 #include <sys/stat.h> 41 #include <sys/types.h> 42 #include <sys/socket.h> 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 46 #ifdef HAVE_CRYPTO 47 #include <openssl/ssl.h> 48 #endif /* HAVE_CRYPTO */ 49 50 #include <err.h> 51 #include <netdb.h> 52 #include <setjmp.h> 53 #include <signal.h> 54 #include <syslog.h> 55 #include <unistd.h> 56 57 #include "dma.h" 58 59 extern struct config *config; 60 extern struct authusers authusers; 61 static jmp_buf timeout_alarm; 62 63 static void 64 sig_alarm(int signo __unused) 65 { 66 longjmp(timeout_alarm, 1); 67 } 68 69 ssize_t 70 send_remote_command(int fd, const char* fmt, ...) 71 { 72 va_list va; 73 char cmd[4096]; 74 ssize_t len = 0; 75 76 va_start(va, fmt); 77 vsprintf(cmd, fmt, va); 78 79 if (((config->features & SECURETRANS) != 0) && 80 ((config->features & NOSSL) == 0)) { 81 len = SSL_write(config->ssl, (const char*)cmd, strlen(cmd)); 82 SSL_write(config->ssl, "\r\n", 2); 83 } 84 else { 85 len = write(fd, cmd, strlen(cmd)); 86 write(fd, "\r\n", 2); 87 } 88 va_end(va); 89 90 return (len+2); 91 } 92 93 int 94 read_remote(int fd, int extbufsize, char *extbuf) 95 { 96 ssize_t rlen = 0; 97 size_t pos, len; 98 char buff[BUF_SIZE]; 99 int done = 0, status = 0, extbufpos = 0; 100 101 if (signal(SIGALRM, sig_alarm) == SIG_ERR) { 102 syslog(LOG_ERR, "SIGALRM error: %m"); 103 } 104 if (setjmp(timeout_alarm) != 0) { 105 syslog(LOG_ERR, "Timeout reached"); 106 return (1); 107 } 108 alarm(CON_TIMEOUT); 109 110 /* 111 * Remote reading code from femail.c written by Henning Brauer of 112 * OpenBSD and released under a BSD style license. 113 */ 114 for (len = pos = 0; !done; ) { 115 rlen = 0; 116 if (pos == 0 || 117 (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) { 118 memmove(buff, buff + pos, len - pos); 119 len -= pos; 120 pos = 0; 121 if (((config->features & SECURETRANS) != 0) && 122 (config->features & NOSSL) == 0) { 123 if ((rlen = SSL_read(config->ssl, buff + len, 124 sizeof(buff) - len)) == -1) 125 err(1, "read"); 126 } else { 127 if ((rlen = read(fd, buff + len, 128 sizeof(buff) - len)) == -1) 129 err(1, "read"); 130 } 131 len += rlen; 132 } 133 /* 134 * If there is an external buffer with a size bigger than zero 135 * and as long as there is space in the external buffer and 136 * there are new characters read from the mailserver 137 * copy them to the external buffer 138 */ 139 if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0 140 && extbuf != NULL) { 141 /* do not write over the bounds of the buffer */ 142 if(extbufpos + rlen > (extbufsize - 1)) { 143 rlen = extbufsize - extbufpos; 144 } 145 memcpy(extbuf + extbufpos, buff + len - rlen, rlen); 146 extbufpos += rlen; 147 } 148 for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++) 149 ; /* Do nothing */ 150 151 if (pos == len) 152 return (0); 153 154 if (buff[pos] == ' ') 155 done = 1; 156 else if (buff[pos] != '-') 157 syslog(LOG_ERR, "invalid syntax in reply from server"); 158 159 /* skip up to \n */ 160 for (; pos < len && buff[pos - 1] != '\n'; pos++) 161 ; /* Do nothing */ 162 163 } 164 alarm(0); 165 166 status = atoi(buff); 167 return (status/100); 168 } 169 170 /* 171 * Handle SMTP authentication 172 */ 173 static int 174 smtp_login(struct qitem *it, int fd, char *login, char* password) 175 { 176 char *temp; 177 int len, res = 0; 178 179 #ifdef HAVE_CRYPTO 180 res = smtp_auth_md5(it, fd, login, password); 181 if (res == 0) { 182 return (0); 183 } else if (res == -2) { 184 /* 185 * If the return code is -2, then then the login attempt failed, 186 * do not try other login mechanisms 187 */ 188 return (-1); 189 } 190 #endif /* HAVE_CRYPTO */ 191 192 if ((config->features & INSECURE) != 0) { 193 /* Send AUTH command according to RFC 2554 */ 194 send_remote_command(fd, "AUTH LOGIN"); 195 if (read_remote(fd, 0, NULL) != 3) { 196 syslog(LOG_ERR, "%s: remote delivery deferred:" 197 " AUTH login not available: %m", it->queueid); 198 return (1); 199 } 200 201 len = base64_encode(login, strlen(login), &temp); 202 if (len <= 0) 203 return (-1); 204 205 send_remote_command(fd, "%s", temp); 206 if (read_remote(fd, 0, NULL) != 3) { 207 syslog(LOG_ERR, "%s: remote delivery deferred:" 208 " AUTH login failed: %m", it->queueid); 209 return (-1); 210 } 211 212 len = base64_encode(password, strlen(password), &temp); 213 if (len <= 0) 214 return (-1); 215 216 send_remote_command(fd, "%s", temp); 217 res = read_remote(fd, 0, NULL); 218 if (res == 5) { 219 syslog(LOG_ERR, "%s: remote delivery failed:" 220 " Authentication failed: %m", it->queueid); 221 return (-1); 222 } else if (res != 2) { 223 syslog(LOG_ERR, "%s: remote delivery failed:" 224 " AUTH password failed: %m", it->queueid); 225 return (-1); 226 } 227 } else { 228 syslog(LOG_ERR, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ", 229 it->queueid); 230 return (1); 231 } 232 233 return (0); 234 } 235 236 static int 237 open_connection(struct qitem *it, const char *host) 238 { 239 struct addrinfo hints, *res, *res0; 240 char servname[128]; 241 const char *errmsg = NULL; 242 int fd, error = 0, port; 243 244 if (config->port != 0) 245 port = config->port; 246 else 247 port = SMTP_PORT; 248 249 /* FIXME get MX record of host */ 250 /* Shamelessly taken from getaddrinfo(3) */ 251 memset(&hints, 0, sizeof(hints)); 252 hints.ai_family = PF_UNSPEC; 253 hints.ai_socktype = SOCK_STREAM; 254 hints.ai_protocol = IPPROTO_TCP; 255 256 snprintf(servname, sizeof(servname), "%d", port); 257 error = getaddrinfo(host, servname, &hints, &res0); 258 if (error) { 259 syslog(LOG_ERR, "%s: remote delivery deferred: " 260 "%s: %m", it->queueid, gai_strerror(error)); 261 return (-1); 262 } 263 fd = -1; 264 for (res = res0; res; res = res->ai_next) { 265 fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol); 266 if (fd < 0) { 267 errmsg = "socket failed"; 268 continue; 269 } 270 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) { 271 errmsg = "connect failed"; 272 close(fd); 273 fd = -1; 274 continue; 275 } 276 break; 277 } 278 if (fd < 0) { 279 syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)", 280 it->queueid, errmsg, host, servname); 281 freeaddrinfo(res0); 282 return (-1); 283 } 284 freeaddrinfo(res0); 285 return (fd); 286 } 287 288 static void 289 copy_qitem(struct qitem *target, struct qitem *it) { 290 target->sender = it->sender; 291 target->addr = it->addr; 292 target->pipeuser = it->pipeuser; 293 target->queuefn = it->queuefn; 294 target->queueid = it->queueid; 295 target->queuef = it->queuef; 296 target->hdrlen = it->hdrlen; 297 target->local = 0; 298 } 299 300 int 301 deliver_remote(struct qitem *it, const char **errmsg, struct queue **queue) 302 { 303 struct authuser *a; 304 char *host, line[1000]; 305 int fd, error = 0, do_auth = 0, res = 0; 306 size_t linelen; 307 308 host = strrchr(it->addr, '@'); 309 /* Should not happen */ 310 if (host == NULL) 311 return(-1); 312 else 313 /* Step over the @ */ 314 host++; 315 316 /* Smarthost support? */ 317 if (config->smarthost != NULL && strlen(config->smarthost) > 0) { 318 syslog(LOG_INFO, "%s: using smarthost (%s)", 319 it->queueid, config->smarthost); 320 host = config->smarthost; 321 } 322 323 fd = open_connection(it, host); 324 if (fd < 0) 325 return(1); 326 327 /* Check first reply from remote host */ 328 config->features |= NOSSL; 329 res = read_remote(fd, 0, NULL); 330 if (res != 2) { 331 syslog(LOG_INFO, "%s: Invalid initial response: %i", 332 it->queueid, res); 333 return(1); 334 } 335 config->features &= ~NOSSL; 336 337 #ifdef HAVE_CRYPTO 338 if ((config->features & SECURETRANS) != 0) { 339 error = smtp_init_crypto(it, fd, config->features); 340 if (error >= 0) 341 syslog(LOG_INFO, "%s: SSL initialization successful", 342 it->queueid); 343 else 344 goto out; 345 } 346 347 /* 348 * If the user doesn't want STARTTLS, but SSL encryption, we 349 * have to enable SSL first, then send EHLO 350 */ 351 if (((config->features & STARTTLS) == 0) && 352 ((config->features & SECURETRANS) != 0)) { 353 send_remote_command(fd, "EHLO %s", hostname()); 354 if (read_remote(fd, 0, NULL) != 2) { 355 syslog(LOG_ERR, "%s: remote delivery deferred: " 356 " EHLO failed: %m", it->queueid); 357 return (-1); 358 } 359 } 360 #endif /* HAVE_CRYPTO */ 361 if (((config->features & SECURETRANS) == 0)) { 362 send_remote_command(fd, "EHLO %s", hostname()); 363 if (read_remote(fd, 0, NULL) != 2) { 364 syslog(LOG_ERR, "%s: remote delivery deferred: " 365 " EHLO failed: %m", it->queueid); 366 return (-1); 367 } 368 } 369 370 /* 371 * Use SMTP authentication if the user defined an entry for the remote 372 * or smarthost 373 */ 374 SLIST_FOREACH(a, &authusers, next) { 375 if (strcmp(a->host, host) == 0) { 376 do_auth = 1; 377 break; 378 } 379 } 380 381 if (do_auth == 1) { 382 /* 383 * Check if the user wants plain text login without using 384 * encryption. 385 */ 386 syslog(LOG_INFO, "%s: Use SMTP authentication", 387 it->queueid); 388 error = smtp_login(it, fd, a->login, a->password); 389 if (error < 0) { 390 syslog(LOG_ERR, "%s: remote delivery failed:" 391 " SMTP login failed: %m", it->queueid); 392 return(-1); 393 } 394 /* SMTP login is not available, so try without */ 395 else if (error > 0) 396 syslog(LOG_ERR, "%s: SMTP login not available." 397 " Try without", it->queueid); 398 } 399 400 send_remote_command(fd, "MAIL FROM:<%s>", it->sender); 401 if (read_remote(fd, 0, NULL) != 2) { 402 syslog(LOG_ERR, "%s: remote delivery deferred:" 403 " MAIL FROM failed: %m", it->queueid); 404 return(1); 405 } 406 407 if (queue == NULL) { 408 /* without given queue send only to one receipient */ 409 send_remote_command(fd, "RCPT TO:<%s>", it->addr); 410 if (read_remote(fd, 0, NULL) != 2) { 411 syslog(LOG_ERR, "%s: remote delivery deferred:" 412 " RCPT TO failed: %m", it->queueid); 413 return(1); 414 } 415 } else { 416 /* Iterate over all recepients and open only one connection */ 417 /* 418 * we need 3 queues: 419 * -delivered addresses 420 * -temporary errors 421 * -permanent errors 422 * these 3 queues are given in **queues (+the first queue with all the qitems to send) 423 * 424 */ 425 426 struct qitem *tit; 427 int rcpt_success = 0; 428 struct stat st; 429 LIST_FOREACH(tit, &queue[0]->queue, next) { 430 struct qitem *qit; 431 qit = calloc(1, sizeof(struct qitem)); 432 copy_qitem(qit, tit); 433 434 if (stat(tit->queuefn, &st) != 0) { 435 syslog(LOG_ERR, "%s: lost queue file `%s'", 436 tit->queueid, tit->queuefn); 437 /* drop qitem and mark it as successfully sent */ 438 LIST_INSERT_HEAD(&queue[1]->queue, qit, next); 439 continue; 440 } 441 442 send_remote_command(fd, "RCPT TO:<%s>", tit->addr); 443 switch (read_remote(fd, 0, NULL)) { 444 case 2: /* everythings fine, receipient accepted */ 445 /* add item to temporary queue, these items will be deleted in deliver_smarthost */ 446 rcpt_success = 1; 447 LIST_INSERT_HEAD(&queue[1]->queue, qit, next); 448 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>", 449 tit->queueid, tit->sender, tit->addr); 450 break; 451 case 4: /* temporary error, try again later */ 452 /* add item to a temporary queue, these items will be tried again */ 453 LIST_INSERT_HEAD(&queue[2]->queue, qit, next); 454 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>", 455 tit->queueid, tit->sender, tit->addr); 456 syslog(LOG_ERR, "%s: remote delivery deferred:" 457 " RCPT TO failed: %m", tit->queueid); 458 break; 459 case 5: /* permanent error, bounce */ 460 /* add item to a queue, which will be returned to deliver_smarthost */ 461 LIST_INSERT_HEAD(&queue[3]->queue, qit, next); 462 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>", 463 tit->queueid, tit->sender, tit->addr); 464 syslog(LOG_ERR, "%s: remote delivery failed:" 465 " RCPT TO failed: %m", tit->queueid); 466 break; 467 } 468 } 469 /* if there was no successful RCPT TO, return _WITHOUT_ error */ 470 if (!rcpt_success) 471 goto out; 472 } 473 474 send_remote_command(fd, "DATA"); 475 if (read_remote(fd, 0, NULL) != 3) { 476 syslog(LOG_ERR, "%s: remote delivery deferred:" 477 " DATA failed: %m", it->queueid); 478 return (1); 479 } 480 481 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) { 482 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %m", 483 it->queueid); 484 return (1); 485 } 486 487 while (!feof(it->queuef)) { 488 if (fgets(line, sizeof(line), it->queuef) == NULL) 489 break; 490 linelen = strlen(line); 491 if (linelen == 0 || line[linelen - 1] != '\n') { 492 syslog(LOG_CRIT, "%s: remote delivery failed:" 493 "corrupted queue file", it->queueid); 494 *errmsg = "corrupted queue file"; 495 error = -1; 496 goto out; 497 } 498 499 /* Remove trailing \n's and escape leading dots */ 500 trim_line(line); 501 502 /* 503 * If the first character is a dot, we escape it so the line 504 * length increases 505 */ 506 if (line[0] == '.') 507 linelen++; 508 509 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) { 510 syslog(LOG_ERR, "%s: remote delivery deferred: " 511 "write error", it->queueid); 512 error = 1; 513 goto out; 514 } 515 } 516 517 send_remote_command(fd, "."); 518 if (read_remote(fd, 0, NULL) != 2) { 519 syslog(LOG_ERR, "%s: remote delivery deferred: %m", 520 it->queueid); 521 return (1); 522 } 523 524 send_remote_command(fd, "QUIT"); 525 if (read_remote(fd, 0, NULL) != 2) { 526 syslog(LOG_ERR, "%s: remote delivery deferred: " 527 "QUIT failed: %m", it->queueid); 528 return (1); 529 } 530 out: 531 532 close(fd); 533 return (error); 534 } 535 536