| File: | src/libexec/spamd/spamd.c |
| Warning: | line 643, column 2 Value stored to 's' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* $OpenBSD: spamd.c,v 1.161 2023/09/05 16:01:58 jca Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Henning Brauer <henning@openbsd.org> |
| 5 | * Copyright (c) 2002-2007 Bob Beck. All rights reserved. |
| 6 | * Copyright (c) 2002 Theo de Raadt. All rights reserved. |
| 7 | * |
| 8 | * Permission to use, copy, modify, and distribute this software for any |
| 9 | * purpose with or without fee is hereby granted, provided that the above |
| 10 | * copyright notice and this permission notice appear in all copies. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 19 | */ |
| 20 | |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/socket.h> |
| 23 | #include <sys/sysctl.h> |
| 24 | #include <sys/resource.h> |
| 25 | #include <sys/signal.h> |
| 26 | #include <sys/stat.h> |
| 27 | |
| 28 | #include <netinet/in.h> |
| 29 | #include <arpa/inet.h> |
| 30 | |
| 31 | #include <err.h> |
| 32 | #include <errno(*__errno()).h> |
| 33 | #include <fcntl.h> |
| 34 | #include <limits.h> |
| 35 | #include <poll.h> |
| 36 | #include <pwd.h> |
| 37 | #include <stdio.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <string.h> |
| 40 | #include <syslog.h> |
| 41 | #include <unistd.h> |
| 42 | #include <tls.h> |
| 43 | |
| 44 | #include <netdb.h> |
| 45 | |
| 46 | #include "sdl.h" |
| 47 | #include "grey.h" |
| 48 | #include "sync.h" |
| 49 | |
| 50 | struct con { |
| 51 | struct pollfd *pfd; |
| 52 | int state; |
| 53 | int laststate; |
| 54 | int af; |
| 55 | int il; |
| 56 | struct sockaddr_storage ss; |
| 57 | void *ia; |
| 58 | char addr[32]; |
| 59 | char caddr[32]; |
| 60 | char helo[MAX_MAIL1024], mail[MAX_MAIL1024], rcpt[MAX_MAIL1024]; |
| 61 | struct sdlist **blacklists; |
| 62 | struct tls *cctx; |
| 63 | |
| 64 | /* |
| 65 | * we will do stuttering by changing these to time_t's of |
| 66 | * now + n, and only advancing when the time is in the past/now |
| 67 | */ |
| 68 | time_t r; |
| 69 | time_t w; |
| 70 | time_t s; |
| 71 | |
| 72 | char ibuf[8192]; |
| 73 | char *ip; |
| 74 | char rend[5]; /* any chars in here causes input termination */ |
| 75 | |
| 76 | char *obuf; |
| 77 | char *lists; |
| 78 | size_t osize; |
| 79 | char *op; |
| 80 | int ol; |
| 81 | int data_lines; |
| 82 | int data_body; |
| 83 | int stutter; |
| 84 | int badcmd; |
| 85 | int sr; |
| 86 | int tlsaction; |
| 87 | } *con; |
| 88 | |
| 89 | #define SPAMD_TLS_ACT_NONE0 0 |
| 90 | #define SPAMD_TLS_ACT_READ_POLLIN1 1 |
| 91 | #define SPAMD_TLS_ACT_READ_POLLOUT2 2 |
| 92 | #define SPAMD_TLS_ACT_WRITE_POLLIN3 3 |
| 93 | #define SPAMD_TLS_ACT_WRITE_POLLOUT4 4 |
| 94 | |
| 95 | #define SPAMD_USER"_spamd" "_spamd" |
| 96 | |
| 97 | void usage(void); |
| 98 | char *grow_obuf(struct con *, int); |
| 99 | int parse_configline(char *); |
| 100 | void parse_configs(void); |
| 101 | void do_config(void); |
| 102 | int append_error_string (struct con *, size_t, char *, int, void *); |
| 103 | void doreply(struct con *); |
| 104 | void setlog(char *, size_t, char *); |
| 105 | void initcon(struct con *, int, struct sockaddr *); |
| 106 | void closecon(struct con *); |
| 107 | int match(const char *, const char *); |
| 108 | void nextstate(struct con *); |
| 109 | void handler(struct con *); |
| 110 | void handlew(struct con *, int one); |
| 111 | char *loglists(struct con *); |
| 112 | void getcaddr(struct con *); |
| 113 | void gethelo(char *, size_t, char *); |
| 114 | int read_configline(FILE *); |
| 115 | void spamd_tls_init(void); |
| 116 | void check_spamd_db(void); |
| 117 | void blackcheck(int); |
| 118 | |
| 119 | char hostname[HOST_NAME_MAX255+1]; |
| 120 | struct syslog_data sdata = SYSLOG_DATA_INIT{0, (const char *)0, (1<<3), 0xff}; |
| 121 | char *nreply = "450"; |
| 122 | char *spamd = "spamd IP-based SPAM blocker"; |
| 123 | int greyback[2]; |
| 124 | int greypipe[2]; |
| 125 | int trappipe[2]; |
| 126 | FILE *grey; |
| 127 | FILE *trapcfg; |
| 128 | time_t passtime = PASSTIME(60 * 25); |
| 129 | time_t greyexp = GREYEXP(60 * 60 * 4); |
| 130 | time_t whiteexp = WHITEEXP(60 * 60 * 24 * 36); |
| 131 | time_t trapexp = TRAPEXP(60 * 60 * 24); |
| 132 | struct passwd *pw; |
| 133 | pid_t jail_pid = -1; |
| 134 | u_short cfg_port; |
| 135 | u_short sync_port; |
| 136 | struct tls_config *tlscfg; |
| 137 | struct tls *tlsctx; |
| 138 | char *tlskeyfile = NULL((void *)0); |
| 139 | char *tlscertfile = NULL((void *)0); |
| 140 | |
| 141 | extern struct sdlist *blacklists; |
| 142 | extern int pfdev; |
| 143 | extern char *low_prio_mx_ip; |
| 144 | |
| 145 | time_t slowdowntill; |
| 146 | |
| 147 | int conffd = -1; |
| 148 | int trapfd = -1; |
| 149 | char *cb; |
| 150 | size_t cbs, cbu; |
| 151 | |
| 152 | time_t t; |
| 153 | |
| 154 | #define MAXCON800 800 |
| 155 | int maxfiles; |
| 156 | int maxcon = MAXCON800; |
| 157 | int maxblack = MAXCON800; |
| 158 | int blackcount; |
| 159 | int clients; |
| 160 | int debug; |
| 161 | int greylist = 1; |
| 162 | int grey_stutter = 10; |
| 163 | int verbose; |
| 164 | int stutter = 1; |
| 165 | int window; |
| 166 | int syncrecv; |
| 167 | int syncsend; |
| 168 | #define MAXTIME400 400 |
| 169 | |
| 170 | #define MAXIMUM(a,b)(((a)>(b))?(a):(b)) (((a)>(b))?(a):(b)) |
| 171 | |
| 172 | void |
| 173 | usage(void) |
| 174 | { |
| 175 | extern char *__progname; |
| 176 | |
| 177 | fprintf(stderr(&__sF[2]), |
| 178 | "usage: %s [-45bdv] [-B maxblack] [-C file] [-c maxcon] " |
| 179 | "[-G passtime:greyexp:whiteexp]\n" |
| 180 | "\t[-h hostname] [-K file] [-l address] [-M address] [-n name]\n" |
| 181 | "\t[-p port] [-S secs] [-s secs] " |
| 182 | "[-w window] [-Y synctarget] [-y synclisten]\n", |
| 183 | __progname); |
| 184 | |
| 185 | exit(1); |
| 186 | } |
| 187 | |
| 188 | char * |
| 189 | grow_obuf(struct con *cp, int off) |
| 190 | { |
| 191 | char *tmp; |
| 192 | |
| 193 | tmp = realloc(cp->obuf, cp->osize + 8192); |
| 194 | if (tmp == NULL((void *)0)) { |
| 195 | free(cp->obuf); |
| 196 | cp->obuf = NULL((void *)0); |
| 197 | cp->osize = 0; |
| 198 | return (NULL((void *)0)); |
| 199 | } else { |
| 200 | cp->osize += 8192; |
| 201 | cp->obuf = tmp; |
| 202 | return (cp->obuf + off); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | int |
| 207 | parse_configline(char *line) |
| 208 | { |
| 209 | char *cp, prev, *name, *msg, *tmp; |
| 210 | char **v4 = NULL((void *)0), **v6 = NULL((void *)0); |
| 211 | const char *errstr; |
| 212 | u_int nv4 = 0, nv6 = 0; |
| 213 | int mdone = 0; |
| 214 | sa_family_t af; |
| 215 | |
| 216 | name = line; |
| 217 | |
| 218 | for (cp = name; *cp && *cp != ';'; cp++) |
| 219 | ; |
| 220 | if (*cp != ';') |
| 221 | goto parse_error; |
| 222 | *cp++ = '\0'; |
| 223 | if (!*cp) { |
| 224 | sdl_del(name); |
| 225 | return (0); |
| 226 | } |
| 227 | msg = cp; |
| 228 | if (*cp++ != '"') |
| 229 | goto parse_error; |
| 230 | prev = '\0'; |
| 231 | for (; !mdone; cp++) { |
| 232 | switch (*cp) { |
| 233 | case '\\': |
| 234 | if (!prev) |
| 235 | prev = *cp; |
| 236 | else |
| 237 | prev = '\0'; |
| 238 | break; |
| 239 | case '"': |
| 240 | if (prev != '\\') { |
| 241 | cp++; |
| 242 | if (*cp == ';') { |
| 243 | mdone = 1; |
| 244 | *cp = '\0'; |
| 245 | } else { |
| 246 | if (debug > 0) |
| 247 | printf("bad message: %s\n", msg); |
| 248 | goto parse_error; |
| 249 | } |
| 250 | } |
| 251 | break; |
| 252 | case '\0': |
| 253 | if (debug > 0) |
| 254 | printf("bad message: %s\n", msg); |
| 255 | goto parse_error; |
| 256 | default: |
| 257 | prev = '\0'; |
| 258 | break; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | while ((tmp = strsep(&cp, ";")) != NULL((void *)0)) { |
| 263 | char **av; |
| 264 | u_int au, ac; |
| 265 | |
| 266 | if (*tmp == '\0') |
| 267 | continue; |
| 268 | |
| 269 | if (strncmp(tmp, "inet", 4) != 0) |
| 270 | goto parse_error; |
| 271 | switch (tmp[4]) { |
| 272 | case '\0': |
| 273 | af = AF_INET2; |
| 274 | break; |
| 275 | case '6': |
| 276 | if (tmp[5] == '\0') { |
| 277 | af = AF_INET624; |
| 278 | break; |
| 279 | } |
| 280 | /* FALLTHROUGH */ |
| 281 | default: |
| 282 | if (debug > 0) |
| 283 | printf("unsupported address family: %s\n", tmp); |
| 284 | goto parse_error; |
| 285 | } |
| 286 | |
| 287 | tmp = strsep(&cp, ";"); |
| 288 | if (tmp == NULL((void *)0)) { |
| 289 | if (debug > 0) |
| 290 | printf("missing address count\n"); |
| 291 | goto parse_error; |
| 292 | } |
| 293 | ac = strtonum(tmp, 0, UINT_MAX0xffffffffU, &errstr); |
| 294 | if (errstr != NULL((void *)0)) { |
| 295 | if (debug > 0) |
| 296 | printf("count \"%s\" is %s\n", tmp, errstr); |
| 297 | goto parse_error; |
| 298 | } |
| 299 | |
| 300 | av = reallocarray(NULL((void *)0), ac, sizeof(char *)); |
| 301 | for (au = 0; au < ac; au++) { |
| 302 | tmp = strsep(&cp, ";"); |
| 303 | if (tmp == NULL((void *)0)) { |
| 304 | if (debug > 0) |
| 305 | printf("expected %u addrs, got %u\n", |
| 306 | ac, au + 1); |
| 307 | free(av); |
| 308 | goto parse_error; |
| 309 | } |
| 310 | if (*tmp == '\0') |
| 311 | continue; |
| 312 | av[au] = tmp; |
| 313 | } |
| 314 | if (af == AF_INET2) { |
| 315 | if (v4 != NULL((void *)0)) { |
| 316 | if (debug > 0) |
| 317 | printf("duplicate inet\n"); |
| 318 | goto parse_error; |
| 319 | } |
| 320 | v4 = av; |
| 321 | nv4 = ac; |
| 322 | } else { |
| 323 | if (v6 != NULL((void *)0)) { |
| 324 | if (debug > 0) |
| 325 | printf("duplicate inet6\n"); |
| 326 | goto parse_error; |
| 327 | } |
| 328 | v6 = av; |
| 329 | nv6 = ac; |
| 330 | } |
| 331 | } |
| 332 | if (nv4 == 0 && nv6 == 0) { |
| 333 | if (debug > 0) |
| 334 | printf("no addresses\n"); |
| 335 | goto parse_error; |
| 336 | } |
| 337 | sdl_add(name, msg, v4, nv4, v6, nv6); |
| 338 | free(v4); |
| 339 | free(v6); |
| 340 | return (0); |
| 341 | |
| 342 | parse_error: |
| 343 | if (debug > 0) |
| 344 | printf("bogus config line - need 'tag;message;af;count;a/m;a/m;a/m...'\n"); |
| 345 | free(v4); |
| 346 | free(v6); |
| 347 | return (-1); |
| 348 | } |
| 349 | |
| 350 | void |
| 351 | parse_configs(void) |
| 352 | { |
| 353 | char *start, *end; |
| 354 | size_t i; |
| 355 | |
| 356 | /* We always leave an extra byte for the NUL. */ |
| 357 | cb[cbu++] = '\0'; |
| 358 | |
| 359 | start = cb; |
| 360 | end = start; |
| 361 | for (i = 0; i < cbu; i++) { |
| 362 | if (*end == '\n') { |
| 363 | *end = '\0'; |
| 364 | if (end > start + 1) |
| 365 | parse_configline(start); |
| 366 | start = ++end; |
| 367 | } else |
| 368 | ++end; |
| 369 | } |
| 370 | if (end > start + 1) |
| 371 | parse_configline(start); |
| 372 | } |
| 373 | |
| 374 | void |
| 375 | do_config(void) |
| 376 | { |
| 377 | int n; |
| 378 | |
| 379 | if (debug > 0) |
| 380 | printf("got configuration connection\n"); |
| 381 | |
| 382 | /* Leave an extra byte for the terminating NUL. */ |
| 383 | if (cbu + 1 >= cbs) { |
| 384 | char *tmp; |
| 385 | |
| 386 | tmp = realloc(cb, cbs + (1024 * 1024)); |
| 387 | if (tmp == NULL((void *)0)) { |
| 388 | if (debug > 0) |
| 389 | warn("realloc"); |
| 390 | goto configdone; |
| 391 | } |
| 392 | cbs += 1024 * 1024; |
| 393 | cb = tmp; |
| 394 | } |
| 395 | |
| 396 | n = read(conffd, cb + cbu, cbs - cbu); |
| 397 | if (debug > 0) |
| 398 | printf("read %d config bytes\n", n); |
| 399 | if (n == 0) { |
| 400 | if (cbu != 0) |
| 401 | parse_configs(); |
| 402 | goto configdone; |
| 403 | } else if (n == -1) { |
| 404 | if (debug > 0) |
| 405 | warn("read"); |
| 406 | goto configdone; |
| 407 | } else |
| 408 | cbu += n; |
| 409 | return; |
| 410 | |
| 411 | configdone: |
| 412 | free(cb); |
| 413 | cb = NULL((void *)0); |
| 414 | cbs = 0; |
| 415 | cbu = 0; |
| 416 | close(conffd); |
| 417 | conffd = -1; |
| 418 | slowdowntill = 0; |
| 419 | } |
| 420 | |
| 421 | int |
| 422 | read_configline(FILE *config) |
| 423 | { |
| 424 | char *buf; |
| 425 | size_t len; |
| 426 | |
| 427 | if ((buf = fgetln(config, &len))) { |
| 428 | if (buf[len - 1] == '\n') |
| 429 | buf[len - 1] = '\0'; |
| 430 | else |
| 431 | return (-1); /* all valid lines end in \n */ |
| 432 | parse_configline(buf); |
| 433 | } else { |
| 434 | syslog_r(LOG_DEBUG7, &sdata, "read_configline: fgetln (%m)"); |
| 435 | return (-1); |
| 436 | } |
| 437 | return (0); |
| 438 | } |
| 439 | |
| 440 | void |
| 441 | spamd_tls_init(void) |
| 442 | { |
| 443 | if (tlskeyfile == NULL((void *)0) && tlscertfile == NULL((void *)0)) |
| 444 | return; |
| 445 | if (tlskeyfile == NULL((void *)0) || tlscertfile == NULL((void *)0)) |
| 446 | errx(1, "need key and certificate for TLS"); |
| 447 | |
| 448 | if ((tlscfg = tls_config_new()) == NULL((void *)0)) |
| 449 | errx(1, "failed to get tls config"); |
| 450 | if ((tlsctx = tls_server()) == NULL((void *)0)) |
| 451 | errx(1, "failed to get tls server"); |
| 452 | |
| 453 | if (tls_config_set_protocols(tlscfg, TLS_PROTOCOLS_ALL((1 << 3)|(1 << 4))) != 0) |
| 454 | errx(1, "failed to set tls protocols"); |
| 455 | |
| 456 | /* might need user-specified ciphers, tls_config_set_ciphers */ |
| 457 | if (tls_config_set_ciphers(tlscfg, "all") != 0) |
| 458 | errx(1, "failed to set tls ciphers"); |
| 459 | |
| 460 | if (tls_config_set_cert_file(tlscfg, tlscertfile) == -1) |
| 461 | errx(1, "unable to set TLS certificate file %s", tlscertfile); |
| 462 | if (tls_config_set_key_file(tlscfg, tlskeyfile) == -1) |
| 463 | errx(1, "unable to set TLS key file %s", tlskeyfile); |
| 464 | if (tls_configure(tlsctx, tlscfg) != 0) |
| 465 | errx(1, "failed to configure TLS - %s", tls_error(tlsctx)); |
| 466 | |
| 467 | /* set hostname to cert's CN unless explicitly given? */ |
| 468 | } |
| 469 | |
| 470 | int |
| 471 | append_error_string(struct con *cp, size_t off, char *fmt, int af, void *ia) |
| 472 | { |
| 473 | char sav = '\0'; |
| 474 | static int lastcont = 0; |
| 475 | char *c = cp->obuf + off; |
| 476 | char *s = fmt; |
| 477 | size_t len = cp->osize - off; |
| 478 | int i = 0; |
| 479 | |
| 480 | if (off == 0) |
| 481 | lastcont = 0; |
| 482 | |
| 483 | if (lastcont != 0) |
| 484 | cp->obuf[lastcont] = '-'; |
| 485 | snprintf(c, len, "%s ", nreply); |
| 486 | i += strlen(c); |
| 487 | lastcont = off + i - 1; |
| 488 | if (*s == '"') |
| 489 | s++; |
| 490 | while (*s) { |
| 491 | /* |
| 492 | * Make sure we at minimum, have room to add a |
| 493 | * format code (4 bytes), and a v6 address(39 bytes) |
| 494 | * and a byte saved in sav. |
| 495 | */ |
| 496 | if (i >= len - 46) { |
| 497 | c = grow_obuf(cp, off); |
| 498 | if (c == NULL((void *)0)) |
| 499 | return (-1); |
| 500 | len = cp->osize - (off + i); |
| 501 | } |
| 502 | |
| 503 | if (c[i-1] == '\n') { |
| 504 | if (lastcont != 0) |
| 505 | cp->obuf[lastcont] = '-'; |
| 506 | snprintf(c + i, len, "%s ", nreply); |
| 507 | i += strlen(c); |
| 508 | lastcont = off + i - 1; |
| 509 | } |
| 510 | |
| 511 | switch (*s) { |
| 512 | case '\\': |
| 513 | case '%': |
| 514 | if (!sav) |
| 515 | sav = *s; |
| 516 | else { |
| 517 | c[i++] = sav; |
| 518 | sav = '\0'; |
| 519 | c[i] = '\0'; |
| 520 | } |
| 521 | break; |
| 522 | case '"': |
| 523 | case 'A': |
| 524 | case 'n': |
| 525 | if (*(s+1) == '\0') { |
| 526 | break; |
| 527 | } |
| 528 | if (sav == '\\' && *s == 'n') { |
| 529 | c[i++] = '\n'; |
| 530 | sav = '\0'; |
| 531 | c[i] = '\0'; |
| 532 | break; |
| 533 | } else if (sav == '\\' && *s == '"') { |
| 534 | c[i++] = '"'; |
| 535 | sav = '\0'; |
| 536 | c[i] = '\0'; |
| 537 | break; |
| 538 | } else if (sav == '%' && *s == 'A') { |
| 539 | inet_ntop(af, ia, c + i, (len - i)); |
| 540 | i += strlen(c + i); |
| 541 | sav = '\0'; |
| 542 | break; |
| 543 | } |
| 544 | /* FALLTHROUGH */ |
| 545 | default: |
| 546 | if (sav) |
| 547 | c[i++] = sav; |
| 548 | c[i++] = *s; |
| 549 | sav = '\0'; |
| 550 | c[i] = '\0'; |
| 551 | break; |
| 552 | } |
| 553 | s++; |
| 554 | } |
| 555 | return (i); |
| 556 | } |
| 557 | |
| 558 | char * |
| 559 | loglists(struct con *cp) |
| 560 | { |
| 561 | static char matchlists[80]; |
| 562 | struct sdlist **matches; |
| 563 | int s = sizeof(matchlists) - 4; |
| 564 | |
| 565 | matchlists[0] = '\0'; |
| 566 | matches = cp->blacklists; |
| 567 | if (matches == NULL((void *)0)) |
| 568 | return (NULL((void *)0)); |
| 569 | for (; *matches; matches++) { |
| 570 | |
| 571 | /* don't report an insane amount of lists in the logs. |
| 572 | * just truncate and indicate with ... |
| 573 | */ |
| 574 | if (strlen(matchlists) + strlen(matches[0]->tag) + 1 >= s) |
| 575 | strlcat(matchlists, " ...", sizeof(matchlists)); |
| 576 | else { |
| 577 | strlcat(matchlists, " ", s); |
| 578 | strlcat(matchlists, matches[0]->tag, s); |
| 579 | } |
| 580 | } |
| 581 | return matchlists; |
| 582 | } |
| 583 | |
| 584 | void |
| 585 | doreply(struct con *cp) |
| 586 | { |
| 587 | struct sdlist **matches; |
| 588 | int off = 0; |
| 589 | |
| 590 | matches = cp->blacklists; |
| 591 | if (matches == NULL((void *)0)) |
| 592 | goto nomatch; |
| 593 | for (; *matches; matches++) { |
| 594 | int used = 0; |
| 595 | int left = cp->osize - off; |
| 596 | |
| 597 | used = append_error_string(cp, off, matches[0]->string, |
| 598 | cp->af, cp->ia); |
| 599 | if (used == -1) |
| 600 | goto bad; |
| 601 | off += used; |
| 602 | left -= used; |
| 603 | if (cp->obuf[off - 1] != '\n') { |
| 604 | if (left < 1) { |
| 605 | if (grow_obuf(cp, off) == NULL((void *)0)) |
| 606 | goto bad; |
| 607 | } |
| 608 | cp->obuf[off++] = '\n'; |
| 609 | cp->obuf[off] = '\0'; |
| 610 | } |
| 611 | } |
| 612 | return; |
| 613 | nomatch: |
| 614 | /* No match. give generic reply */ |
| 615 | free(cp->obuf); |
| 616 | if (cp->blacklists != NULL((void *)0)) |
| 617 | cp->osize = asprintf(&cp->obuf, |
| 618 | "%s-Sorry %s\n" |
| 619 | "%s-You are trying to send mail from an address " |
| 620 | "listed by one\n" |
| 621 | "%s or more IP-based registries as being a SPAM source.\n", |
| 622 | nreply, cp->addr, nreply, nreply); |
| 623 | else |
| 624 | cp->osize = asprintf(&cp->obuf, |
| 625 | "451 Temporary failure, please try again later.\r\n"); |
| 626 | if (cp->osize == -1) |
| 627 | cp->obuf = NULL((void *)0); |
| 628 | cp->osize++; /* size includes the NUL (also changes -1 to 0) */ |
| 629 | return; |
| 630 | bad: |
| 631 | if (cp->obuf != NULL((void *)0)) { |
| 632 | free(cp->obuf); |
| 633 | cp->obuf = NULL((void *)0); |
| 634 | cp->osize = 0; |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | void |
| 639 | setlog(char *p, size_t len, char *f) |
| 640 | { |
| 641 | char *s; |
| 642 | |
| 643 | s = strsep(&f, ":"); |
Value stored to 's' is never read | |
| 644 | if (!f) |
| 645 | return; |
| 646 | while (*f == ' ' || *f == '\t') |
| 647 | f++; |
| 648 | s = strsep(&f, " \t"); |
| 649 | if (s == NULL((void *)0)) |
| 650 | return; |
| 651 | strlcpy(p, s, len); |
| 652 | s = strsep(&p, " \t\n\r"); |
| 653 | if (s == NULL((void *)0)) |
| 654 | return; |
| 655 | s = strsep(&p, " \t\n\r"); |
| 656 | if (s) |
| 657 | *s = '\0'; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Get address client connected to, by doing a getsockname call. |
| 662 | * Must not be used with a NAT'ed connection (use divert-to instead of rdr-to). |
| 663 | */ |
| 664 | void |
| 665 | getcaddr(struct con *cp) |
| 666 | { |
| 667 | struct sockaddr_storage original_destination; |
| 668 | struct sockaddr *odp = (struct sockaddr *) &original_destination; |
| 669 | socklen_t len = sizeof(struct sockaddr_storage); |
| 670 | int error; |
| 671 | |
| 672 | cp->caddr[0] = '\0'; |
| 673 | if (getsockname(cp->pfd->fd, odp, &len) == -1) |
| 674 | return; |
| 675 | error = getnameinfo(odp, odp->sa_len, cp->caddr, sizeof(cp->caddr), |
| 676 | NULL((void *)0), 0, NI_NUMERICHOST1); |
| 677 | if (error) |
| 678 | cp->caddr[0] = '\0'; |
| 679 | } |
| 680 | |
| 681 | void |
| 682 | gethelo(char *p, size_t len, char *f) |
| 683 | { |
| 684 | char *s; |
| 685 | |
| 686 | /* skip HELO/EHLO */ |
| 687 | f+=4; |
| 688 | /* skip whitespace */ |
| 689 | while (*f == ' ' || *f == '\t') |
| 690 | f++; |
| 691 | s = strsep(&f, " \t"); |
| 692 | if (s == NULL((void *)0)) |
| 693 | return; |
| 694 | strlcpy(p, s, len); |
| 695 | s = strsep(&p, " \t\n\r"); |
| 696 | if (s == NULL((void *)0)) |
| 697 | return; |
| 698 | s = strsep(&p, " \t\n\r"); |
| 699 | if (s) |
| 700 | *s = '\0'; |
| 701 | } |
| 702 | |
| 703 | void |
| 704 | initcon(struct con *cp, int fd, struct sockaddr *sa) |
| 705 | { |
| 706 | struct pollfd *pfd = cp->pfd; |
| 707 | char ctimebuf[26]; |
| 708 | time_t tt; |
| 709 | int error; |
| 710 | |
| 711 | if (sa->sa_family != AF_INET2) |
| 712 | errx(1, "not supported yet"); |
| 713 | |
| 714 | time(&tt); |
| 715 | free(cp->obuf); |
| 716 | free(cp->blacklists); |
| 717 | free(cp->lists); |
| 718 | memset(cp, 0, sizeof(*cp)); |
| 719 | if (grow_obuf(cp, 0) == NULL((void *)0)) |
| 720 | err(1, "malloc"); |
| 721 | cp->pfd = pfd; |
| 722 | cp->pfd->fd = fd; |
| 723 | memcpy(&cp->ss, sa, sa->sa_len); |
| 724 | cp->af = sa->sa_family; |
| 725 | cp->ia = &((struct sockaddr_in *)&cp->ss)->sin_addr; |
| 726 | cp->blacklists = sdl_lookup(blacklists, cp->af, cp->ia); |
| 727 | cp->stutter = (greylist && !grey_stutter && cp->blacklists == NULL((void *)0)) ? |
| 728 | 0 : stutter; |
| 729 | error = getnameinfo(sa, sa->sa_len, cp->addr, sizeof(cp->addr), NULL((void *)0), 0, |
| 730 | NI_NUMERICHOST1); |
| 731 | if (error) |
| 732 | strlcpy(cp->addr, "<unknown>", sizeof(cp->addr)); |
| 733 | ctime_r(&t, ctimebuf); |
| 734 | ctimebuf[sizeof(ctimebuf) - 2] = '\0'; /* nuke newline */ |
| 735 | snprintf(cp->obuf, cp->osize, "220 %s ESMTP %s; %s\r\n", |
| 736 | hostname, spamd, ctimebuf); |
| 737 | cp->op = cp->obuf; |
| 738 | cp->ol = strlen(cp->op); |
| 739 | cp->w = tt + cp->stutter; |
| 740 | cp->s = tt; |
| 741 | strlcpy(cp->rend, "\n", sizeof cp->rend); |
| 742 | clients++; |
| 743 | if (cp->blacklists != NULL((void *)0)) { |
| 744 | blackcount++; |
| 745 | if (greylist && blackcount > maxblack) |
| 746 | cp->stutter = 0; |
| 747 | cp->lists = strdup(loglists(cp)); |
| 748 | if (cp->lists == NULL((void *)0)) |
| 749 | err(1, "malloc"); |
| 750 | } |
| 751 | else |
| 752 | cp->lists = NULL((void *)0); |
| 753 | } |
| 754 | |
| 755 | void |
| 756 | closecon(struct con *cp) |
| 757 | { |
| 758 | time_t tt; |
| 759 | |
| 760 | if (cp->cctx) { |
| 761 | tls_close(cp->cctx); |
| 762 | tls_free(cp->cctx); |
| 763 | } |
| 764 | close(cp->pfd->fd); |
| 765 | cp->pfd->fd = -1; |
| 766 | |
| 767 | slowdowntill = 0; |
| 768 | |
| 769 | time(&tt); |
| 770 | syslog_r(LOG_INFO6, &sdata, "%s: disconnected after %lld seconds.%s%s", |
| 771 | cp->addr, (long long)(tt - cp->s), |
| 772 | ((cp->lists == NULL((void *)0)) ? "" : " lists:"), |
| 773 | ((cp->lists == NULL((void *)0)) ? "": cp->lists)); |
| 774 | if (debug > 0) |
| 775 | printf("%s connected for %lld seconds.\n", cp->addr, |
| 776 | (long long)(tt - cp->s)); |
| 777 | free(cp->lists); |
| 778 | cp->lists = NULL((void *)0); |
| 779 | if (cp->blacklists != NULL((void *)0)) { |
| 780 | blackcount--; |
| 781 | free(cp->blacklists); |
| 782 | cp->blacklists = NULL((void *)0); |
| 783 | } |
| 784 | if (cp->obuf != NULL((void *)0)) { |
| 785 | free(cp->obuf); |
| 786 | cp->obuf = NULL((void *)0); |
| 787 | cp->osize = 0; |
| 788 | } |
| 789 | clients--; |
| 790 | } |
| 791 | |
| 792 | int |
| 793 | match(const char *s1, const char *s2) |
| 794 | { |
| 795 | return (strncasecmp(s1, s2, strlen(s2)) == 0); |
| 796 | } |
| 797 | |
| 798 | void |
| 799 | nextstate(struct con *cp) |
| 800 | { |
| 801 | if (match(cp->ibuf, "QUIT") && cp->state < 99) { |
| 802 | snprintf(cp->obuf, cp->osize, "221 %s\r\n", hostname); |
| 803 | cp->op = cp->obuf; |
| 804 | cp->ol = strlen(cp->op); |
| 805 | cp->w = t + cp->stutter; |
| 806 | cp->laststate = cp->state; |
| 807 | cp->state = 99; |
| 808 | return; |
| 809 | } |
| 810 | |
| 811 | if (match(cp->ibuf, "RSET") && cp->state > 2 && cp->state < 50) { |
| 812 | snprintf(cp->obuf, cp->osize, |
| 813 | "250 Ok to start over.\r\n"); |
| 814 | cp->op = cp->obuf; |
| 815 | cp->ol = strlen(cp->op); |
| 816 | cp->w = t + cp->stutter; |
| 817 | cp->laststate = cp->state; |
| 818 | cp->state = 2; |
| 819 | return; |
| 820 | } |
| 821 | switch (cp->state) { |
| 822 | case 0: |
| 823 | tlsinitdone: |
| 824 | /* banner sent; wait for input */ |
| 825 | cp->ip = cp->ibuf; |
| 826 | cp->il = sizeof(cp->ibuf) - 1; |
| 827 | cp->laststate = cp->state; |
| 828 | cp->state = 1; |
| 829 | cp->r = t; |
| 830 | break; |
| 831 | case 1: |
| 832 | /* received input: parse, and select next state */ |
| 833 | if (match(cp->ibuf, "HELO") || |
| 834 | match(cp->ibuf, "EHLO")) { |
| 835 | int nextstate = 2; |
| 836 | cp->helo[0] = '\0'; |
| 837 | gethelo(cp->helo, sizeof cp->helo, cp->ibuf); |
| 838 | if (cp->helo[0] == '\0') { |
| 839 | nextstate = 0; |
| 840 | snprintf(cp->obuf, cp->osize, |
| 841 | "501 helo requires domain name.\r\n"); |
| 842 | } else { |
| 843 | if (cp->cctx == NULL((void *)0) && tlsctx != NULL((void *)0) && |
| 844 | cp->blacklists == NULL((void *)0) && |
| 845 | match(cp->ibuf, "EHLO")) { |
| 846 | snprintf(cp->obuf, cp->osize, |
| 847 | "250-%s\r\n" |
| 848 | "250 STARTTLS\r\n", |
| 849 | hostname); |
| 850 | nextstate = 7; |
| 851 | } else { |
| 852 | snprintf(cp->obuf, cp->osize, |
| 853 | "250 Hello, spam sender. Pleased " |
| 854 | "to be wasting your time.\r\n"); |
| 855 | } |
| 856 | } |
| 857 | cp->op = cp->obuf; |
| 858 | cp->ol = strlen(cp->op); |
| 859 | cp->laststate = cp->state; |
| 860 | cp->state = nextstate; |
| 861 | cp->w = t + cp->stutter; |
| 862 | break; |
| 863 | } |
| 864 | goto mail; |
| 865 | case 2: |
| 866 | /* sent 250 Hello, wait for input */ |
| 867 | cp->ip = cp->ibuf; |
| 868 | cp->il = sizeof(cp->ibuf) - 1; |
| 869 | cp->laststate = cp->state; |
| 870 | cp->state = 3; |
| 871 | cp->r = t; |
| 872 | break; |
| 873 | case 3: |
| 874 | mail: |
| 875 | if (match(cp->ibuf, "MAIL")) { |
| 876 | setlog(cp->mail, sizeof cp->mail, cp->ibuf); |
| 877 | snprintf(cp->obuf, cp->osize, |
| 878 | "250 You are about to try to deliver spam. " |
| 879 | "Your time will be spent, for nothing.\r\n"); |
| 880 | cp->op = cp->obuf; |
| 881 | cp->ol = strlen(cp->op); |
| 882 | cp->laststate = cp->state; |
| 883 | cp->state = 4; |
| 884 | cp->w = t + cp->stutter; |
| 885 | break; |
| 886 | } |
| 887 | goto rcpt; |
| 888 | case 4: |
| 889 | /* sent 250 Sender ok */ |
| 890 | cp->ip = cp->ibuf; |
| 891 | cp->il = sizeof(cp->ibuf) - 1; |
| 892 | cp->laststate = cp->state; |
| 893 | cp->state = 5; |
| 894 | cp->r = t; |
| 895 | break; |
| 896 | case 5: |
| 897 | rcpt: |
| 898 | if (match(cp->ibuf, "RCPT")) { |
| 899 | setlog(cp->rcpt, sizeof(cp->rcpt), cp->ibuf); |
| 900 | snprintf(cp->obuf, cp->osize, |
| 901 | "250 This is hurting you more than it is " |
| 902 | "hurting me.\r\n"); |
| 903 | cp->op = cp->obuf; |
| 904 | cp->ol = strlen(cp->op); |
| 905 | cp->laststate = cp->state; |
| 906 | cp->state = 6; |
| 907 | cp->w = t + cp->stutter; |
| 908 | |
| 909 | if (cp->mail[0] && cp->rcpt[0]) { |
| 910 | if (verbose) |
| 911 | syslog_r(LOG_INFO6, &sdata, |
| 912 | "(%s) %s: %s -> %s", |
| 913 | cp->blacklists ? "BLACK" : "GREY", |
| 914 | cp->addr, cp->mail, |
| 915 | cp->rcpt); |
| 916 | if (debug) |
| 917 | fprintf(stderr(&__sF[2]), "(%s) %s: %s -> %s\n", |
| 918 | cp->blacklists ? "BLACK" : "GREY", |
| 919 | cp->addr, cp->mail, cp->rcpt); |
| 920 | if (greylist && cp->blacklists == NULL((void *)0)) { |
| 921 | /* send this info to the greylister */ |
| 922 | getcaddr(cp); |
| 923 | fprintf(grey, |
| 924 | "CO:%s\nHE:%s\nIP:%s\nFR:%s\nTO:%s\n", |
| 925 | cp->caddr, cp->helo, cp->addr, |
| 926 | cp->mail, cp->rcpt); |
| 927 | fflush(grey); |
| 928 | } |
| 929 | } |
| 930 | break; |
| 931 | } |
| 932 | goto spam; |
| 933 | case 6: |
| 934 | /* sent 250 blah */ |
| 935 | cp->ip = cp->ibuf; |
| 936 | cp->il = sizeof(cp->ibuf) - 1; |
| 937 | cp->laststate = cp->state; |
| 938 | cp->state = 5; |
| 939 | cp->r = t; |
| 940 | break; |
| 941 | case 7: |
| 942 | /* sent 250 STARTTLS, wait for input */ |
| 943 | cp->ip = cp->ibuf; |
| 944 | cp->il = sizeof(cp->ibuf) - 1; |
| 945 | cp->laststate = cp->state; |
| 946 | cp->state = 8; |
| 947 | cp->r = t; |
| 948 | break; |
| 949 | case 8: |
| 950 | if (tlsctx != NULL((void *)0) && cp->blacklists == NULL((void *)0) && |
| 951 | cp->cctx == NULL((void *)0) && match(cp->ibuf, "STARTTLS")) { |
| 952 | snprintf(cp->obuf, cp->osize, |
| 953 | "220 glad you want to burn more CPU cycles on " |
| 954 | "your spam\r\n"); |
| 955 | cp->op = cp->obuf; |
| 956 | cp->ol = strlen(cp->op); |
| 957 | cp->laststate = cp->state; |
| 958 | cp->state = 9; |
| 959 | cp->w = t + cp->stutter; |
| 960 | break; |
| 961 | } |
| 962 | goto mail; |
| 963 | case 9: |
| 964 | if (tls_accept_socket(tlsctx, &cp->cctx, cp->pfd->fd) == -1) { |
| 965 | snprintf(cp->obuf, cp->osize, |
| 966 | "500 STARTTLS failed\r\n"); |
| 967 | cp->op = cp->obuf; |
| 968 | cp->ol = strlen(cp->op); |
| 969 | cp->laststate = cp->state; |
| 970 | cp->state = 98; |
| 971 | goto done; |
| 972 | } |
| 973 | goto tlsinitdone; |
| 974 | |
| 975 | case 50: |
| 976 | spam: |
| 977 | if (match(cp->ibuf, "DATA")) { |
| 978 | snprintf(cp->obuf, cp->osize, |
| 979 | "354 Enter spam, end with \".\" on a line by " |
| 980 | "itself\r\n"); |
| 981 | cp->state = 60; |
| 982 | if (window && setsockopt(cp->pfd->fd, SOL_SOCKET0xffff, |
| 983 | SO_RCVBUF0x1002, &window, sizeof(window)) == -1) { |
| 984 | syslog_r(LOG_DEBUG7, &sdata,"setsockopt: %m"); |
| 985 | /* don't fail if this doesn't work. */ |
| 986 | } |
| 987 | cp->ip = cp->ibuf; |
| 988 | cp->il = sizeof(cp->ibuf) - 1; |
| 989 | cp->op = cp->obuf; |
| 990 | cp->ol = strlen(cp->op); |
| 991 | cp->w = t + cp->stutter; |
| 992 | if (greylist && cp->blacklists == NULL((void *)0)) { |
| 993 | cp->laststate = cp->state; |
| 994 | cp->state = 98; |
| 995 | goto done; |
| 996 | } |
| 997 | } else { |
| 998 | if (match(cp->ibuf, "NOOP")) |
| 999 | snprintf(cp->obuf, cp->osize, |
| 1000 | "250 2.0.0 OK I did nothing\r\n"); |
| 1001 | else { |
| 1002 | snprintf(cp->obuf, cp->osize, |
| 1003 | "500 5.5.1 Command unrecognized\r\n"); |
| 1004 | cp->badcmd++; |
| 1005 | if (cp->badcmd > 20) { |
| 1006 | cp->laststate = cp->state; |
| 1007 | cp->state = 98; |
| 1008 | goto done; |
| 1009 | } |
| 1010 | } |
| 1011 | cp->state = cp->laststate; |
| 1012 | cp->ip = cp->ibuf; |
| 1013 | cp->il = sizeof(cp->ibuf) - 1; |
| 1014 | cp->op = cp->obuf; |
| 1015 | cp->ol = strlen(cp->op); |
| 1016 | cp->w = t + cp->stutter; |
| 1017 | } |
| 1018 | break; |
| 1019 | case 60: |
| 1020 | /* sent 354 blah */ |
| 1021 | cp->ip = cp->ibuf; |
| 1022 | cp->il = sizeof(cp->ibuf) - 1; |
| 1023 | cp->laststate = cp->state; |
| 1024 | cp->state = 70; |
| 1025 | cp->r = t; |
| 1026 | break; |
| 1027 | case 70: { |
| 1028 | char *p, *q; |
| 1029 | |
| 1030 | for (p = q = cp->ibuf; q <= cp->ip; ++q) |
| 1031 | if (*q == '\n' || q == cp->ip) { |
| 1032 | *q = 0; |
| 1033 | if (q > p && q[-1] == '\r') |
| 1034 | q[-1] = 0; |
| 1035 | if (!strcmp(p, ".") || |
| 1036 | (cp->data_body && ++cp->data_lines >= 10)) { |
| 1037 | cp->laststate = cp->state; |
| 1038 | cp->state = 98; |
| 1039 | goto done; |
| 1040 | } |
| 1041 | if (!cp->data_body && !*p) |
| 1042 | cp->data_body = 1; |
| 1043 | if (verbose && cp->data_body && *p) |
| 1044 | syslog_r(LOG_DEBUG7, &sdata, "%s: " |
| 1045 | "Body: %s", cp->addr, p); |
| 1046 | else if (verbose && (match(p, "FROM:") || |
| 1047 | match(p, "TO:") || match(p, "SUBJECT:"))) |
| 1048 | syslog_r(LOG_INFO6, &sdata, "%s: %s", |
| 1049 | cp->addr, p); |
| 1050 | p = ++q; |
| 1051 | } |
| 1052 | cp->ip = cp->ibuf; |
| 1053 | cp->il = sizeof(cp->ibuf) - 1; |
| 1054 | cp->r = t; |
| 1055 | break; |
| 1056 | } |
| 1057 | case 98: |
| 1058 | done: |
| 1059 | doreply(cp); |
| 1060 | cp->op = cp->obuf; |
| 1061 | cp->ol = strlen(cp->op); |
| 1062 | cp->w = t + cp->stutter; |
| 1063 | cp->laststate = cp->state; |
| 1064 | cp->state = 99; |
| 1065 | break; |
| 1066 | case 99: |
| 1067 | closecon(cp); |
| 1068 | break; |
| 1069 | default: |
| 1070 | errx(1, "illegal state %d", cp->state); |
| 1071 | break; |
| 1072 | } |
| 1073 | } |
| 1074 | |
| 1075 | void |
| 1076 | handler(struct con *cp) |
| 1077 | { |
| 1078 | int end = 0; |
| 1079 | ssize_t n; |
| 1080 | |
| 1081 | if (cp->r || cp->tlsaction != SPAMD_TLS_ACT_NONE0) { |
| 1082 | if (cp->cctx) { |
| 1083 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1084 | n = tls_read(cp->cctx, cp->ip, cp->il); |
| 1085 | if (n == TLS_WANT_POLLIN-2) |
| 1086 | cp->tlsaction = SPAMD_TLS_ACT_READ_POLLIN1; |
| 1087 | if (n == TLS_WANT_POLLOUT-3) |
| 1088 | cp->tlsaction = SPAMD_TLS_ACT_READ_POLLOUT2; |
| 1089 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1090 | return; |
| 1091 | } else |
| 1092 | n = read(cp->pfd->fd, cp->ip, cp->il); |
| 1093 | |
| 1094 | if (n == 0) |
| 1095 | closecon(cp); |
| 1096 | else if (n == -1) { |
| 1097 | if (errno(*__errno()) == EAGAIN35) |
| 1098 | return; |
| 1099 | if (debug > 0) |
| 1100 | warn("read"); |
| 1101 | closecon(cp); |
| 1102 | } else { |
| 1103 | cp->ip[n] = '\0'; |
| 1104 | if (cp->rend[0]) |
| 1105 | if (strpbrk(cp->ip, cp->rend)) |
| 1106 | end = 1; |
| 1107 | cp->ip += n; |
| 1108 | cp->il -= n; |
| 1109 | } |
| 1110 | } |
| 1111 | if (end || cp->il == 0) { |
| 1112 | while (cp->ip > cp->ibuf && |
| 1113 | (cp->ip[-1] == '\r' || cp->ip[-1] == '\n')) |
| 1114 | cp->ip--; |
| 1115 | *cp->ip = '\0'; |
| 1116 | cp->r = 0; |
| 1117 | nextstate(cp); |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | void |
| 1122 | handlew(struct con *cp, int one) |
| 1123 | { |
| 1124 | ssize_t n; |
| 1125 | |
| 1126 | /* kill stutter on greylisted connections after initial delay */ |
| 1127 | if (cp->stutter && greylist && cp->blacklists == NULL((void *)0) && |
| 1128 | (t - cp->s) > grey_stutter) |
| 1129 | cp->stutter=0; |
| 1130 | |
| 1131 | if (cp->w || cp->tlsaction != SPAMD_TLS_ACT_NONE0) { |
| 1132 | if (*cp->op == '\n' && !cp->sr) { |
| 1133 | /* insert \r before \n */ |
| 1134 | if (cp->cctx) { |
| 1135 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1136 | n = tls_write(cp->cctx, "\r", 1); |
| 1137 | if (n == TLS_WANT_POLLIN-2) |
| 1138 | cp->tlsaction = |
| 1139 | SPAMD_TLS_ACT_WRITE_POLLIN3; |
| 1140 | if (n == TLS_WANT_POLLOUT-3) |
| 1141 | cp->tlsaction = |
| 1142 | SPAMD_TLS_ACT_WRITE_POLLOUT4; |
| 1143 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1144 | return; |
| 1145 | } else |
| 1146 | n = write(cp->pfd->fd, "\r", 1); |
| 1147 | |
| 1148 | if (n == 0) { |
| 1149 | closecon(cp); |
| 1150 | goto handled; |
| 1151 | } else if (n == -1) { |
| 1152 | if (errno(*__errno()) == EAGAIN35) |
| 1153 | return; |
| 1154 | if (debug > 0 && errno(*__errno()) != EPIPE32) |
| 1155 | warn("write"); |
| 1156 | closecon(cp); |
| 1157 | goto handled; |
| 1158 | } |
| 1159 | } |
| 1160 | if (*cp->op == '\r') |
| 1161 | cp->sr = 1; |
| 1162 | else |
| 1163 | cp->sr = 0; |
| 1164 | if (cp->cctx) { |
| 1165 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1166 | n = tls_write(cp->cctx, cp->op, cp->ol); |
| 1167 | if (n == TLS_WANT_POLLIN-2) |
| 1168 | cp->tlsaction = SPAMD_TLS_ACT_WRITE_POLLIN3; |
| 1169 | if (n == TLS_WANT_POLLOUT-3) |
| 1170 | cp->tlsaction = SPAMD_TLS_ACT_WRITE_POLLOUT4; |
| 1171 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1172 | return; |
| 1173 | } else |
| 1174 | n = write(cp->pfd->fd, cp->op, |
| 1175 | (one && cp->stutter) ? 1 : cp->ol); |
| 1176 | |
| 1177 | if (n == 0) |
| 1178 | closecon(cp); |
| 1179 | else if (n == -1) { |
| 1180 | if (errno(*__errno()) == EAGAIN35) |
| 1181 | return; |
| 1182 | if (debug > 0 && errno(*__errno()) != EPIPE32) |
| 1183 | warn("write"); |
| 1184 | closecon(cp); |
| 1185 | } else { |
| 1186 | cp->op += n; |
| 1187 | cp->ol -= n; |
| 1188 | } |
| 1189 | } |
| 1190 | handled: |
| 1191 | cp->w = t + cp->stutter; |
| 1192 | if (cp->ol == 0) { |
| 1193 | cp->w = 0; |
| 1194 | nextstate(cp); |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | static int |
| 1199 | get_maxfiles(void) |
| 1200 | { |
| 1201 | int mib[2], maxfiles; |
| 1202 | size_t len; |
| 1203 | |
| 1204 | mib[0] = CTL_KERN1; |
| 1205 | mib[1] = KERN_MAXFILES7; |
| 1206 | len = sizeof(maxfiles); |
| 1207 | if (sysctl(mib, 2, &maxfiles, &len, NULL((void *)0), 0) == -1) |
| 1208 | return(MAXCON800); |
| 1209 | if ((maxfiles - 200) < 10) |
| 1210 | errx(1, "kern.maxfiles is only %d, can not continue\n", |
| 1211 | maxfiles); |
| 1212 | else |
| 1213 | return(maxfiles - 200); |
| 1214 | } |
| 1215 | |
| 1216 | /* Symbolic indexes for pfd[] below */ |
| 1217 | #define PFD_SMTPLISTEN0 0 |
| 1218 | #define PFD_CONFLISTEN1 1 |
| 1219 | #define PFD_SYNCFD2 2 |
| 1220 | #define PFD_CONFFD3 3 |
| 1221 | #define PFD_TRAPFD4 4 |
| 1222 | #define PFD_GREYBACK5 5 |
| 1223 | #define PFD_FIRSTCON6 6 |
| 1224 | |
| 1225 | int |
| 1226 | main(int argc, char *argv[]) |
| 1227 | { |
| 1228 | struct pollfd *pfd; |
| 1229 | struct sockaddr_in sin; |
| 1230 | struct sockaddr_in lin; |
| 1231 | int ch, smtplisten, conflisten, syncfd = -1, i, one = 1; |
| 1232 | u_short port; |
| 1233 | long long passt, greyt, whitet; |
| 1234 | struct servent *ent; |
| 1235 | struct rlimit rlp; |
| 1236 | char *bind_address = NULL((void *)0); |
| 1237 | const char *errstr; |
| 1238 | char *sync_iface = NULL((void *)0); |
| 1239 | char *sync_baddr = NULL((void *)0); |
| 1240 | struct addrinfo hints, *res; |
| 1241 | char *addr; |
| 1242 | char portstr[6]; |
| 1243 | int error; |
| 1244 | |
| 1245 | tzset(); |
| 1246 | openlog_r("spamd", LOG_PID0x01 | LOG_NDELAY0x08, LOG_DAEMON(3<<3), &sdata); |
| 1247 | |
| 1248 | if ((ent = getservbyname("spamd", "tcp")) == NULL((void *)0)) |
| 1249 | errx(1, "Can't find service \"spamd\" in /etc/services"); |
| 1250 | port = ntohs(ent->s_port)(__uint16_t)(__builtin_constant_p(ent->s_port) ? (__uint16_t )(((__uint16_t)(ent->s_port) & 0xffU) << 8 | ((__uint16_t )(ent->s_port) & 0xff00U) >> 8) : __swap16md(ent ->s_port)); |
| 1251 | if ((ent = getservbyname("spamd-cfg", "tcp")) == NULL((void *)0)) |
| 1252 | errx(1, "Can't find service \"spamd-cfg\" in /etc/services"); |
| 1253 | cfg_port = ntohs(ent->s_port)(__uint16_t)(__builtin_constant_p(ent->s_port) ? (__uint16_t )(((__uint16_t)(ent->s_port) & 0xffU) << 8 | ((__uint16_t )(ent->s_port) & 0xff00U) >> 8) : __swap16md(ent ->s_port)); |
| 1254 | if ((ent = getservbyname("spamd-sync", "udp")) == NULL((void *)0)) |
| 1255 | errx(1, "Can't find service \"spamd-sync\" in /etc/services"); |
| 1256 | sync_port = ntohs(ent->s_port)(__uint16_t)(__builtin_constant_p(ent->s_port) ? (__uint16_t )(((__uint16_t)(ent->s_port) & 0xffU) << 8 | ((__uint16_t )(ent->s_port) & 0xff00U) >> 8) : __swap16md(ent ->s_port)); |
| 1257 | |
| 1258 | if (gethostname(hostname, sizeof hostname) == -1) |
| 1259 | err(1, "gethostname"); |
| 1260 | maxfiles = get_maxfiles(); |
| 1261 | if (maxcon > maxfiles) |
| 1262 | maxcon = maxfiles; |
| 1263 | if (maxblack > maxfiles) |
| 1264 | maxblack = maxfiles; |
| 1265 | while ((ch = |
| 1266 | getopt(argc, argv, "45l:c:B:p:bdG:h:s:S:M:n:vw:y:Y:C:K:")) != -1) { |
| 1267 | switch (ch) { |
| 1268 | case '4': |
| 1269 | nreply = "450"; |
| 1270 | break; |
| 1271 | case '5': |
| 1272 | nreply = "550"; |
| 1273 | break; |
| 1274 | case 'l': |
| 1275 | bind_address = optarg; |
| 1276 | break; |
| 1277 | case 'B': |
| 1278 | maxblack = strtonum(optarg, 0, INT_MAX0x7fffffff, &errstr); |
| 1279 | if (errstr) |
| 1280 | errx(1, "-B %s: %s", optarg, errstr); |
| 1281 | break; |
| 1282 | case 'c': |
| 1283 | maxcon = strtonum(optarg, 1, maxfiles, &errstr); |
| 1284 | if (errstr) { |
| 1285 | fprintf(stderr(&__sF[2]), "-c %s: %s\n", optarg, errstr); |
| 1286 | usage(); |
| 1287 | } |
| 1288 | break; |
| 1289 | case 'p': |
| 1290 | port = strtonum(optarg, 1, USHRT_MAX0xffff, &errstr); |
| 1291 | if (errstr) |
| 1292 | errx(1, "-p %s: %s", optarg, errstr); |
| 1293 | break; |
| 1294 | case 'd': |
| 1295 | debug = 1; |
| 1296 | break; |
| 1297 | case 'b': |
| 1298 | greylist = 0; |
| 1299 | break; |
| 1300 | case 'G': |
| 1301 | if (sscanf(optarg, "%lld:%lld:%lld", &passt, &greyt, |
| 1302 | &whitet) != 3) |
| 1303 | usage(); |
| 1304 | passtime = passt; |
| 1305 | greyexp = greyt; |
| 1306 | whiteexp = whitet; |
| 1307 | /* convert to seconds from minutes */ |
| 1308 | passtime *= 60; |
| 1309 | /* convert to seconds from hours */ |
| 1310 | whiteexp *= (60 * 60); |
| 1311 | /* convert to seconds from hours */ |
| 1312 | greyexp *= (60 * 60); |
| 1313 | break; |
| 1314 | case 'h': |
| 1315 | memset(hostname, 0, sizeof(hostname)); |
| 1316 | if (strlcpy(hostname, optarg, sizeof(hostname)) >= |
| 1317 | sizeof(hostname)) |
| 1318 | errx(1, "-h arg too long"); |
| 1319 | break; |
| 1320 | case 's': |
| 1321 | stutter = strtonum(optarg, 0, 10, &errstr); |
| 1322 | if (errstr) |
| 1323 | usage(); |
| 1324 | break; |
| 1325 | case 'S': |
| 1326 | grey_stutter = strtonum(optarg, 0, 90, &errstr); |
| 1327 | if (errstr) |
| 1328 | usage(); |
| 1329 | break; |
| 1330 | case 'M': |
| 1331 | low_prio_mx_ip = optarg; |
| 1332 | break; |
| 1333 | case 'n': |
| 1334 | spamd = optarg; |
| 1335 | break; |
| 1336 | case 'v': |
| 1337 | verbose = 1; |
| 1338 | break; |
| 1339 | case 'w': |
| 1340 | window = strtonum(optarg, 1, INT_MAX0x7fffffff, &errstr); |
| 1341 | if (errstr) |
| 1342 | errx(1, "-w %s: %s", optarg, errstr); |
| 1343 | break; |
| 1344 | case 'Y': |
| 1345 | if (sync_addhost(optarg, sync_port) != 0) |
| 1346 | sync_iface = optarg; |
| 1347 | syncsend++; |
| 1348 | break; |
| 1349 | case 'y': |
| 1350 | sync_baddr = optarg; |
| 1351 | syncrecv++; |
| 1352 | break; |
| 1353 | case 'C': |
| 1354 | tlscertfile = optarg; |
| 1355 | break; |
| 1356 | case 'K': |
| 1357 | tlskeyfile = optarg; |
| 1358 | break; |
| 1359 | default: |
| 1360 | usage(); |
| 1361 | break; |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | setproctitle("[priv]%s%s", |
| 1366 | greylist ? " (greylist)" : "", |
| 1367 | (syncrecv || syncsend) ? " (sync)" : ""); |
| 1368 | |
| 1369 | if (syncsend || syncrecv) { |
| 1370 | syncfd = sync_init(sync_iface, sync_baddr, sync_port); |
| 1371 | if (syncfd == -1) |
| 1372 | err(1, "sync init"); |
| 1373 | } |
| 1374 | |
| 1375 | if (geteuid()) |
| 1376 | errx(1, "need root privileges"); |
| 1377 | |
| 1378 | if ((pw = getpwnam(SPAMD_USER"_spamd")) == NULL((void *)0)) |
| 1379 | errx(1, "no such user %s", SPAMD_USER"_spamd"); |
| 1380 | |
| 1381 | if (!greylist) { |
| 1382 | maxblack = maxcon; |
| 1383 | } else if (maxblack > maxcon) |
| 1384 | usage(); |
| 1385 | |
| 1386 | spamd_tls_init(); |
| 1387 | |
| 1388 | rlp.rlim_cur = rlp.rlim_max = maxcon + 15; |
| 1389 | if (setrlimit(RLIMIT_NOFILE8, &rlp) == -1) |
| 1390 | err(1, "setrlimit"); |
| 1391 | |
| 1392 | pfd = reallocarray(NULL((void *)0), PFD_FIRSTCON6 + maxcon, sizeof(*pfd)); |
| 1393 | if (pfd == NULL((void *)0)) |
| 1394 | err(1, "reallocarray"); |
| 1395 | |
| 1396 | con = calloc(maxcon, sizeof(*con)); |
| 1397 | if (con == NULL((void *)0)) |
| 1398 | err(1, "calloc"); |
| 1399 | |
| 1400 | con->obuf = malloc(8192); |
| 1401 | |
| 1402 | if (con->obuf == NULL((void *)0)) |
| 1403 | err(1, "malloc"); |
| 1404 | con->osize = 8192; |
| 1405 | |
| 1406 | for (i = 0; i < maxcon; i++) { |
| 1407 | con[i].pfd = &pfd[PFD_FIRSTCON6 + i]; |
| 1408 | con[i].pfd->fd = -1; |
| 1409 | } |
| 1410 | |
| 1411 | signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1412 | |
| 1413 | smtplisten = socket(AF_INET2, SOCK_STREAM1, 0); |
| 1414 | if (smtplisten == -1) |
| 1415 | err(1, "socket"); |
| 1416 | |
| 1417 | if (setsockopt(smtplisten, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &one, |
| 1418 | sizeof(one)) == -1) |
| 1419 | return (-1); |
| 1420 | |
| 1421 | conflisten = socket(AF_INET2, SOCK_STREAM1, 0); |
| 1422 | if (conflisten == -1) |
| 1423 | err(1, "socket"); |
| 1424 | |
| 1425 | if (setsockopt(conflisten, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &one, |
| 1426 | sizeof(one)) == -1) |
| 1427 | return (-1); |
| 1428 | |
| 1429 | memset(&hints, 0, sizeof(hints)); |
| 1430 | hints.ai_family = AF_INET2; |
| 1431 | addr = bind_address; |
| 1432 | snprintf(portstr, sizeof(portstr), "%hu", port); |
| 1433 | |
| 1434 | if ((error = getaddrinfo(addr, portstr, &hints, &res)) != 0) { |
| 1435 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 1436 | } |
| 1437 | |
| 1438 | if (bind(smtplisten, res->ai_addr, res->ai_addrlen) == -1) { |
| 1439 | freeaddrinfo(res); |
| 1440 | err(1, "bind"); |
| 1441 | } |
| 1442 | freeaddrinfo(res); |
| 1443 | |
| 1444 | memset(&lin, 0, sizeof sin); |
| 1445 | lin.sin_len = sizeof(sin); |
| 1446 | lin.sin_addr.s_addr = htonl(INADDR_LOOPBACK)(__uint32_t)(__builtin_constant_p(((u_int32_t)(0x7f000001))) ? (__uint32_t)(((__uint32_t)(((u_int32_t)(0x7f000001))) & 0xff ) << 24 | ((__uint32_t)(((u_int32_t)(0x7f000001))) & 0xff00) << 8 | ((__uint32_t)(((u_int32_t)(0x7f000001)) ) & 0xff0000) >> 8 | ((__uint32_t)(((u_int32_t)(0x7f000001 ))) & 0xff000000) >> 24) : __swap32md(((u_int32_t)( 0x7f000001)))); |
| 1447 | lin.sin_family = AF_INET2; |
| 1448 | lin.sin_port = htons(cfg_port)(__uint16_t)(__builtin_constant_p(cfg_port) ? (__uint16_t)((( __uint16_t)(cfg_port) & 0xffU) << 8 | ((__uint16_t) (cfg_port) & 0xff00U) >> 8) : __swap16md(cfg_port)); |
| 1449 | |
| 1450 | if (bind(conflisten, (struct sockaddr *)&lin, sizeof lin) == -1) |
| 1451 | err(1, "bind local"); |
| 1452 | |
| 1453 | if (debug == 0) { |
| 1454 | if (daemon(1, 1) == -1) |
| 1455 | err(1, "daemon"); |
| 1456 | } |
| 1457 | |
| 1458 | if (greylist) { |
| 1459 | pfdev = open("/dev/pf", O_RDWR0x0002); |
| 1460 | if (pfdev == -1) { |
| 1461 | syslog_r(LOG_ERR3, &sdata, "open /dev/pf: %m"); |
| 1462 | exit(1); |
| 1463 | } |
| 1464 | |
| 1465 | check_spamd_db(); |
| 1466 | |
| 1467 | maxblack = (maxblack >= maxcon) ? maxcon - 100 : maxblack; |
| 1468 | if (maxblack < 0) |
| 1469 | maxblack = 0; |
| 1470 | |
| 1471 | /* open pipe to talk to greylister */ |
| 1472 | if (socketpair(AF_UNIX1, SOCK_DGRAM2, 0, greyback) == -1) { |
| 1473 | syslog(LOG_ERR3, "socketpair (%m)"); |
| 1474 | exit(1); |
| 1475 | } |
| 1476 | if (pipe(greypipe) == -1) { |
| 1477 | syslog(LOG_ERR3, "pipe (%m)"); |
| 1478 | exit(1); |
| 1479 | } |
| 1480 | /* open pipe to receive spamtrap configs */ |
| 1481 | if (pipe(trappipe) == -1) { |
| 1482 | syslog(LOG_ERR3, "pipe (%m)"); |
| 1483 | exit(1); |
| 1484 | } |
| 1485 | jail_pid = fork(); |
| 1486 | switch (jail_pid) { |
| 1487 | case -1: |
| 1488 | syslog(LOG_ERR3, "fork (%m)"); |
| 1489 | exit(1); |
| 1490 | case 0: |
| 1491 | /* child - continue */ |
| 1492 | signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1493 | grey = fdopen(greypipe[1], "w"); |
| 1494 | if (grey == NULL((void *)0)) { |
| 1495 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1496 | _exit(1); |
| 1497 | } |
| 1498 | close(greyback[0]); |
| 1499 | close(greypipe[0]); |
| 1500 | trapfd = trappipe[0]; |
| 1501 | trapcfg = fdopen(trappipe[0], "r"); |
| 1502 | if (trapcfg == NULL((void *)0)) { |
| 1503 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1504 | _exit(1); |
| 1505 | } |
| 1506 | close(trappipe[1]); |
| 1507 | |
| 1508 | if (setgroups(1, &pw->pw_gid) || |
| 1509 | setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || |
| 1510 | setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) |
| 1511 | err(1, "failed to drop privs"); |
| 1512 | |
| 1513 | goto jail; |
| 1514 | } |
| 1515 | /* parent - run greylister */ |
| 1516 | close(greyback[1]); |
| 1517 | grey = fdopen(greypipe[0], "r"); |
| 1518 | if (grey == NULL((void *)0)) { |
| 1519 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1520 | exit(1); |
| 1521 | } |
| 1522 | close(greypipe[1]); |
| 1523 | trapcfg = fdopen(trappipe[1], "w"); |
| 1524 | if (trapcfg == NULL((void *)0)) { |
| 1525 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1526 | exit(1); |
| 1527 | } |
| 1528 | close(trappipe[0]); |
| 1529 | return (greywatcher()); |
| 1530 | } |
| 1531 | |
| 1532 | jail: |
| 1533 | if (pledge("stdio inet", NULL((void *)0)) == -1) |
| 1534 | err(1, "pledge"); |
| 1535 | |
| 1536 | if (listen(smtplisten, 10) == -1) |
| 1537 | err(1, "listen"); |
| 1538 | |
| 1539 | if (listen(conflisten, 10) == -1) |
| 1540 | err(1, "listen"); |
| 1541 | |
| 1542 | if (debug != 0) |
| 1543 | printf("listening for incoming connections.\n"); |
| 1544 | syslog_r(LOG_WARNING4, &sdata, "listening for incoming connections."); |
| 1545 | |
| 1546 | /* We always check for trap and sync events if configured. */ |
| 1547 | if (trapfd != -1) { |
| 1548 | pfd[PFD_TRAPFD4].fd = trapfd; |
| 1549 | pfd[PFD_TRAPFD4].events = POLLIN0x0001; |
| 1550 | } else { |
| 1551 | pfd[PFD_TRAPFD4].fd = -1; |
| 1552 | pfd[PFD_TRAPFD4].events = 0; |
| 1553 | } |
| 1554 | if (syncrecv) { |
| 1555 | pfd[PFD_SYNCFD2].fd = syncfd; |
| 1556 | pfd[PFD_SYNCFD2].events = POLLIN0x0001; |
| 1557 | } else { |
| 1558 | pfd[PFD_SYNCFD2].fd = -1; |
| 1559 | pfd[PFD_SYNCFD2].events = 0; |
| 1560 | } |
| 1561 | if (greylist) { |
| 1562 | pfd[PFD_GREYBACK5].fd = greyback[1]; |
| 1563 | pfd[PFD_GREYBACK5].events = POLLIN0x0001; |
| 1564 | } else { |
| 1565 | pfd[PFD_GREYBACK5].fd = -1; |
| 1566 | pfd[PFD_GREYBACK5].events = 0; |
| 1567 | } |
| 1568 | |
| 1569 | /* events and pfd entries for con[] are filled in below. */ |
| 1570 | pfd[PFD_SMTPLISTEN0].fd = smtplisten; |
| 1571 | pfd[PFD_CONFLISTEN1].fd = conflisten; |
| 1572 | |
| 1573 | while (1) { |
| 1574 | int numcon = 0, n, timeout, writers; |
| 1575 | |
| 1576 | time(&t); |
| 1577 | |
| 1578 | writers = 0; |
| 1579 | for (i = 0; i < maxcon; i++) { |
| 1580 | if (con[i].pfd->fd == -1) |
| 1581 | continue; |
| 1582 | con[i].pfd->events = 0; |
| 1583 | if (con[i].r) { |
| 1584 | if (con[i].r + MAXTIME400 <= t) { |
| 1585 | closecon(&con[i]); |
| 1586 | continue; |
| 1587 | } |
| 1588 | con[i].pfd->events |= POLLIN0x0001; |
| 1589 | } |
| 1590 | if (con[i].w) { |
| 1591 | if (con[i].w + MAXTIME400 <= t) { |
| 1592 | closecon(&con[i]); |
| 1593 | continue; |
| 1594 | } |
| 1595 | if (con[i].w <= t) |
| 1596 | con[i].pfd->events |= POLLOUT0x0004; |
| 1597 | writers = 1; |
| 1598 | } |
| 1599 | if (con[i].tlsaction == SPAMD_TLS_ACT_READ_POLLIN1 || |
| 1600 | con[i].tlsaction == SPAMD_TLS_ACT_WRITE_POLLIN3) |
| 1601 | con[i].pfd->events = POLLIN0x0001; |
| 1602 | if (con[i].tlsaction == SPAMD_TLS_ACT_READ_POLLOUT2 || |
| 1603 | con[i].tlsaction == SPAMD_TLS_ACT_WRITE_POLLOUT4) |
| 1604 | con[i].pfd->events = POLLOUT0x0004; |
| 1605 | if (i + 1 > numcon) |
| 1606 | numcon = i + 1; |
| 1607 | } |
| 1608 | pfd[PFD_SMTPLISTEN0].events = 0; |
| 1609 | pfd[PFD_CONFLISTEN1].events = 0; |
| 1610 | pfd[PFD_CONFFD3].events = 0; |
| 1611 | pfd[PFD_CONFFD3].fd = conffd; |
| 1612 | if (slowdowntill == 0) { |
| 1613 | pfd[PFD_SMTPLISTEN0].events = POLLIN0x0001; |
| 1614 | |
| 1615 | /* only one active config conn at a time */ |
| 1616 | if (conffd == -1) |
| 1617 | pfd[PFD_CONFLISTEN1].events = POLLIN0x0001; |
| 1618 | else |
| 1619 | pfd[PFD_CONFFD3].events = POLLIN0x0001; |
| 1620 | } |
| 1621 | |
| 1622 | /* If we are not listening, wake up at least once a second */ |
| 1623 | if (writers == 0 && slowdowntill == 0) |
| 1624 | timeout = INFTIM(-1); |
| 1625 | else |
| 1626 | timeout = 1000; |
| 1627 | |
| 1628 | n = poll(pfd, PFD_FIRSTCON6 + numcon, timeout); |
| 1629 | if (n == -1) { |
| 1630 | if (errno(*__errno()) != EINTR4) |
| 1631 | err(1, "poll"); |
| 1632 | continue; |
| 1633 | } |
| 1634 | |
| 1635 | /* Check if we can speed up accept() calls */ |
| 1636 | if (slowdowntill && slowdowntill > t) |
| 1637 | slowdowntill = 0; |
| 1638 | |
| 1639 | for (i = 0; i < maxcon; i++) { |
| 1640 | if (con[i].pfd->fd == -1) |
| 1641 | continue; |
| 1642 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLHUP0x0010) { |
| 1643 | closecon(&con[i]); |
| 1644 | continue; |
| 1645 | } |
| 1646 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLIN0x0001) { |
| 1647 | if (con[i].tlsaction == |
| 1648 | SPAMD_TLS_ACT_WRITE_POLLIN3) |
| 1649 | handlew(&con[i], clients + 5 < maxcon); |
| 1650 | else |
| 1651 | handler(&con[i]); |
| 1652 | } |
| 1653 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLOUT0x0004) { |
| 1654 | if (con[i].tlsaction == |
| 1655 | SPAMD_TLS_ACT_READ_POLLOUT2) |
| 1656 | handler(&con[i]); |
| 1657 | else |
| 1658 | handlew(&con[i], clients + 5 < maxcon); |
| 1659 | } |
| 1660 | } |
| 1661 | if (pfd[PFD_SMTPLISTEN0].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 1662 | socklen_t sinlen; |
| 1663 | int s2; |
| 1664 | |
| 1665 | sinlen = sizeof(sin); |
| 1666 | s2 = accept4(smtplisten, (struct sockaddr *)&sin, &sinlen, |
| 1667 | SOCK_NONBLOCK0x4000); |
| 1668 | if (s2 == -1) { |
| 1669 | switch (errno(*__errno())) { |
| 1670 | case EINTR4: |
| 1671 | case ECONNABORTED53: |
| 1672 | break; |
| 1673 | case EMFILE24: |
| 1674 | case ENFILE23: |
| 1675 | slowdowntill = time(NULL((void *)0)) + 1; |
| 1676 | break; |
| 1677 | default: |
| 1678 | errx(1, "accept"); |
| 1679 | } |
| 1680 | } else { |
| 1681 | /* Check if we hit the chosen fd limit */ |
| 1682 | for (i = 0; i < maxcon; i++) |
| 1683 | if (con[i].pfd->fd == -1) |
| 1684 | break; |
| 1685 | if (i == maxcon) { |
| 1686 | close(s2); |
| 1687 | slowdowntill = 0; |
| 1688 | } else { |
| 1689 | initcon(&con[i], s2, |
| 1690 | (struct sockaddr *)&sin); |
| 1691 | syslog_r(LOG_INFO6, &sdata, |
| 1692 | "%s: connected (%d/%d)%s%s", |
| 1693 | con[i].addr, clients, blackcount, |
| 1694 | ((con[i].lists == NULL((void *)0)) ? "" : |
| 1695 | ", lists:"), |
| 1696 | ((con[i].lists == NULL((void *)0)) ? "": |
| 1697 | con[i].lists)); |
| 1698 | } |
| 1699 | } |
| 1700 | } |
| 1701 | if (pfd[PFD_CONFLISTEN1].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 1702 | socklen_t sinlen; |
| 1703 | |
| 1704 | sinlen = sizeof(lin); |
| 1705 | conffd = accept(conflisten, (struct sockaddr *)&lin, |
| 1706 | &sinlen); |
| 1707 | if (conffd == -1) { |
| 1708 | switch (errno(*__errno())) { |
| 1709 | case EINTR4: |
| 1710 | case ECONNABORTED53: |
| 1711 | break; |
| 1712 | case EMFILE24: |
| 1713 | case ENFILE23: |
| 1714 | slowdowntill = time(NULL((void *)0)) + 1; |
| 1715 | break; |
| 1716 | default: |
| 1717 | errx(1, "accept"); |
| 1718 | } |
| 1719 | } else if (ntohs(lin.sin_port)(__uint16_t)(__builtin_constant_p(lin.sin_port) ? (__uint16_t )(((__uint16_t)(lin.sin_port) & 0xffU) << 8 | ((__uint16_t )(lin.sin_port) & 0xff00U) >> 8) : __swap16md(lin.sin_port )) >= IPPORT_RESERVED1024) { |
| 1720 | close(conffd); |
| 1721 | conffd = -1; |
| 1722 | slowdowntill = 0; |
| 1723 | } |
| 1724 | } else if (pfd[PFD_CONFFD3].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1725 | do_config(); |
| 1726 | if (pfd[PFD_TRAPFD4].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1727 | read_configline(trapcfg); |
| 1728 | if (pfd[PFD_SYNCFD2].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1729 | sync_recv(); |
| 1730 | if (pfd[PFD_GREYBACK5].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1731 | blackcheck(greyback[1]); |
| 1732 | } |
| 1733 | exit(1); |
| 1734 | } |
| 1735 | |
| 1736 | void |
| 1737 | blackcheck(int fd) |
| 1738 | { |
| 1739 | struct sockaddr_storage ss; |
| 1740 | ssize_t nread; |
| 1741 | void *ia; |
| 1742 | char ch; |
| 1743 | |
| 1744 | /* Read sockaddr from greylister and look it up in the blacklists. */ |
| 1745 | nread = recv(fd, &ss, sizeof(ss), 0); |
| 1746 | if (nread == -1) { |
| 1747 | syslog(LOG_ERR3, "%s: recv: %m", __func__); |
| 1748 | return; |
| 1749 | } |
| 1750 | if (nread != sizeof(struct sockaddr_in) && |
| 1751 | nread != sizeof(struct sockaddr_in6)) { |
| 1752 | syslog(LOG_ERR3, "%s: invalid size %zd", __func__, nread); |
| 1753 | return; |
| 1754 | } |
| 1755 | if (ss.ss_family == AF_INET2) { |
| 1756 | ia = &((struct sockaddr_in *)&ss)->sin_addr; |
| 1757 | } else if (ss.ss_family == AF_INET624) { |
| 1758 | ia = &((struct sockaddr_in6 *)&ss)->sin6_addr; |
| 1759 | } else { |
| 1760 | syslog(LOG_ERR3, "%s: bad family %d", __func__, ss.ss_family); |
| 1761 | return; |
| 1762 | } |
| 1763 | ch = sdl_check(blacklists, ss.ss_family, ia) ? '1' : '0'; |
| 1764 | |
| 1765 | /* Send '1' for match or '0' for no match. */ |
| 1766 | if (send(fd, &ch, sizeof(ch), 0) == -1) { |
| 1767 | syslog(LOG_ERR3, "%s: send: %m", __func__); |
| 1768 | return; |
| 1769 | } |
| 1770 | } |