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 1.6 2008/04/20 13:44:24 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 <netdb.h> 51 #include <setjmp.h> 52 #include <signal.h> 53 #include <syslog.h> 54 #include <unistd.h> 55 56 #include "dma.h" 57 58 extern struct config *config; 59 extern struct authusers authusers; 60 static jmp_buf timeout_alarm; 61 62 static void 63 sig_alarm(int signo __unused) 64 { 65 longjmp(timeout_alarm, 1); 66 } 67 68 ssize_t 69 send_remote_command(int fd, const char* fmt, ...) 70 { 71 va_list va; 72 char cmd[4096]; 73 ssize_t len = 0; 74 75 va_start(va, fmt); 76 vsprintf(cmd, fmt, va); 77 78 if (((config->features & SECURETRANS) != 0) && 79 ((config->features & NOSSL) == 0)) { 80 len = SSL_write(config->ssl, (const char*)cmd, strlen(cmd)); 81 SSL_write(config->ssl, "\r\n", 2); 82 } 83 else { 84 len = write(fd, cmd, strlen(cmd)); 85 write(fd, "\r\n", 2); 86 } 87 va_end(va); 88 89 return (len+2); 90 } 91 92 int 93 read_remote(int fd) 94 { 95 ssize_t rlen = 0; 96 size_t pos, len; 97 char buff[BUF_SIZE]; 98 int done = 0, status = 0; 99 100 if (signal(SIGALRM, sig_alarm) == SIG_ERR) { 101 syslog(LOG_ERR, "SIGALRM error: %m"); 102 } 103 if (setjmp(timeout_alarm) != 0) { 104 syslog(LOG_ERR, "Timeout reached"); 105 return (1); 106 } 107 alarm(CON_TIMEOUT); 108 109 /* 110 * Remote reading code from femail.c written by Henning Brauer of 111 * OpenBSD and released under a BSD style license. 112 */ 113 for (len = pos = 0; !done; ) { 114 if (pos == 0 || 115 (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) { 116 memmove(buff, buff + pos, len - pos); 117 len -= pos; 118 pos = 0; 119 if (((config->features & SECURETRANS) != 0) && 120 (config->features & NOSSL) == 0) { 121 if ((rlen = SSL_read(config->ssl, buff + len, 122 sizeof(buff) - len)) == -1) 123 err(1, "read"); 124 } else { 125 if ((rlen = read(fd, buff + len, 126 sizeof(buff) - len)) == -1) 127 err(1, "read"); 128 } 129 len += rlen; 130 } 131 for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++) 132 ; /* Do nothing */ 133 134 if (pos == len) 135 return (0); 136 137 if (buff[pos] == ' ') 138 done = 1; 139 else if (buff[pos] != '-') 140 syslog(LOG_ERR, "invalid syntax in reply from server"); 141 142 /* skip up to \n */ 143 for (; pos < len && buff[pos - 1] != '\n'; pos++) 144 ; /* Do nothing */ 145 146 } 147 alarm(0); 148 149 status = atoi(buff); 150 return (status/100); 151 } 152 153 /* 154 * Handle SMTP authentication 155 * 156 * XXX TODO: give me AUTH CRAM-MD5 157 */ 158 static int 159 smtp_login(struct qitem *it, int fd, char *login, char* password) 160 { 161 char *temp; 162 int len, res = 0; 163 164 /* Send AUTH command according to RFC 2554 */ 165 send_remote_command(fd, "AUTH LOGIN"); 166 if (read_remote(fd) != 3) { 167 syslog(LOG_ERR, "%s: remote delivery deferred:" 168 " AUTH login not available: %m", it->queueid); 169 return (1); 170 } 171 172 len = base64_encode(login, strlen(login), &temp); 173 if (len <= 0) 174 return (-1); 175 176 send_remote_command(fd, "%s", temp); 177 if (read_remote(fd) != 3) { 178 syslog(LOG_ERR, "%s: remote delivery deferred:" 179 " AUTH login failed: %m", it->queueid); 180 return (-1); 181 } 182 183 len = base64_encode(password, strlen(password), &temp); 184 if (len <= 0) 185 return (-1); 186 187 send_remote_command(fd, "%s", temp); 188 res = read_remote(fd); 189 if (res == 5) { 190 syslog(LOG_ERR, "%s: remote delivery failed:" 191 " Authentication failed: %m", it->queueid); 192 return (-1); 193 } else if (res != 2) { 194 syslog(LOG_ERR, "%s: remote delivery failed:" 195 " AUTH password failed: %m", it->queueid); 196 return (-1); 197 } 198 199 return (0); 200 } 201 202 static int 203 open_connection(struct qitem *it, const char *host) 204 { 205 struct addrinfo hints, *res, *res0; 206 char servname[128]; 207 const char *errmsg = NULL; 208 int fd, error = 0, port; 209 210 if (config->port != 0) 211 port = config->port; 212 else 213 port = SMTP_PORT; 214 215 /* Shamelessly taken from getaddrinfo(3) */ 216 memset(&hints, 0, sizeof(hints)); 217 hints.ai_family = PF_UNSPEC; 218 hints.ai_socktype = SOCK_STREAM; 219 hints.ai_protocol = IPPROTO_TCP; 220 221 snprintf(servname, sizeof(servname), "%d", port); 222 error = getaddrinfo(host, servname, &hints, &res0); 223 if (error) { 224 syslog(LOG_ERR, "%s: remote delivery deferred: " 225 "%s: %m", it->queueid, gai_strerror(error)); 226 return (-1); 227 } 228 fd = -1; 229 for (res = res0; res; res = res->ai_next) { 230 fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol); 231 if (fd < 0) { 232 errmsg = "socket failed"; 233 continue; 234 } 235 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) { 236 errmsg = "connect failed"; 237 close(fd); 238 fd = -1; 239 continue; 240 } 241 break; 242 } 243 if (fd < 0) { 244 syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)", 245 it->queueid, errmsg, host, servname); 246 freeaddrinfo(res0); 247 return (-1); 248 } 249 freeaddrinfo(res0); 250 return (fd); 251 } 252 253 int 254 deliver_remote(struct qitem *it, const char **errmsg) 255 { 256 struct authuser *a; 257 char *host, line[1000]; 258 int fd, error = 0, do_auth = 0, res = 0; 259 size_t linelen; 260 261 host = strrchr(it->addr, '@'); 262 /* Should not happen */ 263 if (host == NULL) 264 return(-1); 265 else 266 /* Step over the @ */ 267 host++; 268 269 /* Smarthost support? */ 270 if (config->smarthost != NULL && strlen(config->smarthost) > 0) { 271 syslog(LOG_INFO, "%s: using smarthost (%s)", 272 it->queueid, config->smarthost); 273 host = config->smarthost; 274 } 275 276 fd = open_connection(it, host); 277 if (fd < 0) 278 return (1); 279 280 /* Check first reply from remote host */ 281 config->features |= NOSSL; 282 res = read_remote(fd); 283 if (res != 2) { 284 syslog(LOG_INFO, "%s: Invalid initial response: %i", 285 it->queueid, res); 286 return(1); 287 } 288 config->features &= ~NOSSL; 289 290 #ifdef HAVE_CRYPTO 291 if ((config->features & SECURETRANS) != 0) { 292 error = smtp_init_crypto(it, fd, config->features); 293 if (error >= 0) 294 syslog(LOG_INFO, "%s: SSL initialization successful", 295 it->queueid); 296 else 297 goto out; 298 } 299 300 /* 301 * If the user doesn't want STARTTLS, but SSL encryption, we 302 * have to enable SSL first, then send EHLO 303 */ 304 if (((config->features & STARTTLS) == 0) && 305 ((config->features & SECURETRANS) != 0)) { 306 send_remote_command(fd, "EHLO %s", hostname()); 307 if (read_remote(fd) != 2) { 308 syslog(LOG_ERR, "%s: remote delivery deferred: " 309 " EHLO failed: %m", it->queueid); 310 return (-1); 311 } 312 } 313 #endif /* HAVE_CRYPTO */ 314 if (((config->features & SECURETRANS) == 0)) { 315 send_remote_command(fd, "EHLO %s", hostname()); 316 if (read_remote(fd) != 2) { 317 syslog(LOG_ERR, "%s: remote delivery deferred: " 318 " EHLO failed: %m", it->queueid); 319 return (-1); 320 } 321 } 322 323 /* 324 * Use SMTP authentication if the user defined an entry for the remote 325 * or smarthost 326 */ 327 SLIST_FOREACH(a, &authusers, next) { 328 if (strcmp(a->host, host) == 0) { 329 do_auth = 1; 330 break; 331 } 332 } 333 334 if (do_auth == 1) { 335 /* 336 * Check if the user wants plain text login without using 337 * encryption. 338 */ 339 if ((config->features & INSECURE) != 0) { 340 syslog(LOG_INFO, "%s: Use SMTP authentication", 341 it->queueid); 342 error = smtp_login(it, fd, a->login, a->password); 343 if (error < 0) { 344 syslog(LOG_ERR, "%s: remote delivery failed:" 345 " SMTP login failed: %m", it->queueid); 346 return (-1); 347 } 348 /* SMTP login is not available, so try without */ 349 else if (error > 0) 350 syslog(LOG_ERR, "%s: SMTP login not available." 351 " Try without", it->queueid); 352 } else { 353 syslog(LOG_ERR, "%s: Skip SMTP login. ", 354 it->queueid); 355 } 356 } 357 358 send_remote_command(fd, "MAIL FROM:<%s>", it->sender); 359 if (read_remote(fd) != 2) { 360 syslog(LOG_ERR, "%s: remote delivery deferred:" 361 " MAIL FROM failed: %m", it->queueid); 362 return (1); 363 } 364 365 /* XXX TODO: 366 * Iterate over all recepients and open only one connection 367 */ 368 send_remote_command(fd, "RCPT TO:<%s>", it->addr); 369 if (read_remote(fd) != 2) { 370 syslog(LOG_ERR, "%s: remote delivery deferred:" 371 " RCPT TO failed: %m", it->queueid); 372 return (1); 373 } 374 375 send_remote_command(fd, "DATA"); 376 if (read_remote(fd) != 3) { 377 syslog(LOG_ERR, "%s: remote delivery deferred:" 378 " DATA failed: %m", it->queueid); 379 return (1); 380 } 381 382 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) { 383 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %m", 384 it->queueid); 385 return (1); 386 } 387 388 while (!feof(it->queuef)) { 389 if (fgets(line, sizeof(line), it->queuef) == NULL) 390 break; 391 linelen = strlen(line); 392 if (linelen == 0 || line[linelen - 1] != '\n') { 393 syslog(LOG_CRIT, "%s: remote delivery failed:" 394 "corrupted queue file", it->queueid); 395 *errmsg = "corrupted queue file"; 396 error = -1; 397 goto out; 398 } 399 400 /* Remove trailing \n's and escape leading dots */ 401 trim_line(line); 402 403 /* 404 * If the first character is a dot, we escape it so the line 405 * length increases 406 */ 407 if (line[0] == '.') 408 linelen++; 409 410 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) { 411 syslog(LOG_ERR, "%s: remote delivery deferred: " 412 "write error", it->queueid); 413 error = 1; 414 goto out; 415 } 416 } 417 418 send_remote_command(fd, "."); 419 if (read_remote(fd) != 2) { 420 syslog(LOG_ERR, "%s: remote delivery deferred: %m", 421 it->queueid); 422 return (1); 423 } 424 425 send_remote_command(fd, "QUIT"); 426 if (read_remote(fd) != 2) { 427 syslog(LOG_ERR, "%s: remote delivery deferred: " 428 "QUIT failed: %m", it->queueid); 429 return (1); 430 } 431 out: 432 433 close(fd); 434 return (error); 435 } 436 437