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 int 289 deliver_remote(struct qitem *it, const char **errmsg) 290 { 291 struct authuser *a; 292 char *host, line[1000]; 293 int fd, error = 0, do_auth = 0, res = 0; 294 size_t linelen; 295 296 host = strrchr(it->addr, '@'); 297 /* Should not happen */ 298 if (host == NULL) 299 return(-1); 300 else 301 /* Step over the @ */ 302 host++; 303 304 /* Smarthost support? */ 305 if (config->smarthost != NULL && strlen(config->smarthost) > 0) { 306 syslog(LOG_INFO, "%s: using smarthost (%s:%i)", 307 it->queueid, config->smarthost, config->port); 308 host = config->smarthost; 309 } 310 311 fd = open_connection(it, host); 312 if (fd < 0) 313 return (1); 314 315 /* Check first reply from remote host */ 316 config->features |= NOSSL; 317 res = read_remote(fd, 0, NULL); 318 if (res != 2) { 319 syslog(LOG_INFO, "%s: Invalid initial response: %i", 320 it->queueid, res); 321 return(1); 322 } 323 config->features &= ~NOSSL; 324 325 #ifdef HAVE_CRYPTO 326 if ((config->features & SECURETRANS) != 0) { 327 error = smtp_init_crypto(it, fd, config->features); 328 if (error >= 0) 329 syslog(LOG_INFO, "%s: SSL initialization successful", 330 it->queueid); 331 else 332 goto out; 333 } 334 335 /* 336 * If the user doesn't want STARTTLS, but SSL encryption, we 337 * have to enable SSL first, then send EHLO 338 */ 339 if (((config->features & STARTTLS) == 0) && 340 ((config->features & SECURETRANS) != 0)) { 341 send_remote_command(fd, "EHLO %s", hostname()); 342 if (read_remote(fd, 0, NULL) != 2) { 343 syslog(LOG_ERR, "%s: remote delivery deferred: " 344 " EHLO failed: %m", it->queueid); 345 return (-1); 346 } 347 } 348 #endif /* HAVE_CRYPTO */ 349 if (((config->features & SECURETRANS) == 0)) { 350 send_remote_command(fd, "EHLO %s", hostname()); 351 if (read_remote(fd, 0, NULL) != 2) { 352 syslog(LOG_ERR, "%s: remote delivery deferred: " 353 " EHLO failed: %m", it->queueid); 354 return (-1); 355 } 356 } 357 358 /* 359 * Use SMTP authentication if the user defined an entry for the remote 360 * or smarthost 361 */ 362 SLIST_FOREACH(a, &authusers, next) { 363 if (strcmp(a->host, host) == 0) { 364 do_auth = 1; 365 break; 366 } 367 } 368 369 if (do_auth == 1) { 370 /* 371 * Check if the user wants plain text login without using 372 * encryption. 373 */ 374 syslog(LOG_INFO, "%s: Use SMTP authentication", 375 it->queueid); 376 error = smtp_login(it, fd, a->login, a->password); 377 if (error < 0) { 378 syslog(LOG_ERR, "%s: remote delivery failed:" 379 " SMTP login failed: %m", it->queueid); 380 return (-1); 381 } 382 /* SMTP login is not available, so try without */ 383 else if (error > 0) 384 syslog(LOG_ERR, "%s: SMTP login not available." 385 " Try without", it->queueid); 386 } 387 388 send_remote_command(fd, "MAIL FROM:<%s>", it->sender); 389 if (read_remote(fd, 0, NULL) != 2) { 390 syslog(LOG_ERR, "%s: remote delivery deferred:" 391 " MAIL FROM failed: %m", it->queueid); 392 return (1); 393 } 394 395 send_remote_command(fd, "RCPT TO:<%s>", it->addr); 396 if (read_remote(fd, 0, NULL) != 2) { 397 syslog(LOG_ERR, "%s: remote delivery deferred:" 398 " RCPT TO failed: %m", it->queueid); 399 return (1); 400 } 401 402 send_remote_command(fd, "DATA"); 403 if (read_remote(fd, 0, NULL) != 3) { 404 syslog(LOG_ERR, "%s: remote delivery deferred:" 405 " DATA failed: %m", it->queueid); 406 return (1); 407 } 408 409 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) { 410 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %m", 411 it->queueid); 412 return (1); 413 } 414 415 while (!feof(it->queuef)) { 416 if (fgets(line, sizeof(line), it->queuef) == NULL) 417 break; 418 linelen = strlen(line); 419 if (linelen == 0 || line[linelen - 1] != '\n') { 420 syslog(LOG_CRIT, "%s: remote delivery failed:" 421 "corrupted queue file", it->queueid); 422 *errmsg = "corrupted queue file"; 423 error = -1; 424 goto out; 425 } 426 427 /* Remove trailing \n's and escape leading dots */ 428 trim_line(line); 429 430 /* 431 * If the first character is a dot, we escape it so the line 432 * length increases 433 */ 434 if (line[0] == '.') 435 linelen++; 436 437 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) { 438 syslog(LOG_ERR, "%s: remote delivery deferred: " 439 "write error", it->queueid); 440 error = 1; 441 goto out; 442 } 443 } 444 445 send_remote_command(fd, "."); 446 if (read_remote(fd, 0, NULL) != 2) { 447 syslog(LOG_ERR, "%s: remote delivery deferred: %m", 448 it->queueid); 449 return (1); 450 } 451 452 send_remote_command(fd, "QUIT"); 453 if (read_remote(fd, 0, NULL) != 2) { 454 syslog(LOG_ERR, "%s: remote delivery deferred: " 455 "QUIT failed: %m", it->queueid); 456 return (1); 457 } 458 out: 459 460 close(fd); 461 return (error); 462 } 463 464