| File: | src/libexec/spamd/spamd.c |
| Warning: | line 644, column 2 Value stored to 's' is never read |
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| 1 | /* $OpenBSD: spamd.c,v 1.158 2021/07/14 13:33:57 kn 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 <limits.h> |
| 43 | #include <tls.h> |
| 44 | |
| 45 | #include <netdb.h> |
| 46 | |
| 47 | #include "sdl.h" |
| 48 | #include "grey.h" |
| 49 | #include "sync.h" |
| 50 | |
| 51 | struct con { |
| 52 | struct pollfd *pfd; |
| 53 | int state; |
| 54 | int laststate; |
| 55 | int af; |
| 56 | int il; |
| 57 | struct sockaddr_storage ss; |
| 58 | void *ia; |
| 59 | char addr[32]; |
| 60 | char caddr[32]; |
| 61 | char helo[MAX_MAIL1024], mail[MAX_MAIL1024], rcpt[MAX_MAIL1024]; |
| 62 | struct sdlist **blacklists; |
| 63 | struct tls *cctx; |
| 64 | |
| 65 | /* |
| 66 | * we will do stuttering by changing these to time_t's of |
| 67 | * now + n, and only advancing when the time is in the past/now |
| 68 | */ |
| 69 | time_t r; |
| 70 | time_t w; |
| 71 | time_t s; |
| 72 | |
| 73 | char ibuf[8192]; |
| 74 | char *ip; |
| 75 | char rend[5]; /* any chars in here causes input termination */ |
| 76 | |
| 77 | char *obuf; |
| 78 | char *lists; |
| 79 | size_t osize; |
| 80 | char *op; |
| 81 | int ol; |
| 82 | int data_lines; |
| 83 | int data_body; |
| 84 | int stutter; |
| 85 | int badcmd; |
| 86 | int sr; |
| 87 | int tlsaction; |
| 88 | } *con; |
| 89 | |
| 90 | #define SPAMD_TLS_ACT_NONE0 0 |
| 91 | #define SPAMD_TLS_ACT_READ_POLLIN1 1 |
| 92 | #define SPAMD_TLS_ACT_READ_POLLOUT2 2 |
| 93 | #define SPAMD_TLS_ACT_WRITE_POLLIN3 3 |
| 94 | #define SPAMD_TLS_ACT_WRITE_POLLOUT4 4 |
| 95 | |
| 96 | #define SPAMD_USER"_spamd" "_spamd" |
| 97 | |
| 98 | void usage(void); |
| 99 | char *grow_obuf(struct con *, int); |
| 100 | int parse_configline(char *); |
| 101 | void parse_configs(void); |
| 102 | void do_config(void); |
| 103 | int append_error_string (struct con *, size_t, char *, int, void *); |
| 104 | void doreply(struct con *); |
| 105 | void setlog(char *, size_t, char *); |
| 106 | void initcon(struct con *, int, struct sockaddr *); |
| 107 | void closecon(struct con *); |
| 108 | int match(const char *, const char *); |
| 109 | void nextstate(struct con *); |
| 110 | void handler(struct con *); |
| 111 | void handlew(struct con *, int one); |
| 112 | char *loglists(struct con *); |
| 113 | void getcaddr(struct con *); |
| 114 | void gethelo(char *, size_t, char *); |
| 115 | int read_configline(FILE *); |
| 116 | void spamd_tls_init(void); |
| 117 | void check_spamd_db(void); |
| 118 | void blackcheck(int); |
| 119 | |
| 120 | char hostname[HOST_NAME_MAX255+1]; |
| 121 | struct syslog_data sdata = SYSLOG_DATA_INIT{0, (const char *)0, (1<<3), 0xff}; |
| 122 | char *nreply = "450"; |
| 123 | char *spamd = "spamd IP-based SPAM blocker"; |
| 124 | int greyback[2]; |
| 125 | int greypipe[2]; |
| 126 | int trappipe[2]; |
| 127 | FILE *grey; |
| 128 | FILE *trapcfg; |
| 129 | time_t passtime = PASSTIME(60 * 25); |
| 130 | time_t greyexp = GREYEXP(60 * 60 * 4); |
| 131 | time_t whiteexp = WHITEEXP(60 * 60 * 24 * 36); |
| 132 | time_t trapexp = TRAPEXP(60 * 60 * 24); |
| 133 | struct passwd *pw; |
| 134 | pid_t jail_pid = -1; |
| 135 | u_short cfg_port; |
| 136 | u_short sync_port; |
| 137 | struct tls_config *tlscfg; |
| 138 | struct tls *tlsctx; |
| 139 | char *tlskeyfile = NULL((void*)0); |
| 140 | char *tlscertfile = NULL((void*)0); |
| 141 | |
| 142 | extern struct sdlist *blacklists; |
| 143 | extern int pfdev; |
| 144 | extern char *low_prio_mx_ip; |
| 145 | |
| 146 | time_t slowdowntill; |
| 147 | |
| 148 | int conffd = -1; |
| 149 | int trapfd = -1; |
| 150 | char *cb; |
| 151 | size_t cbs, cbu; |
| 152 | |
| 153 | time_t t; |
| 154 | |
| 155 | #define MAXCON800 800 |
| 156 | int maxfiles; |
| 157 | int maxcon = MAXCON800; |
| 158 | int maxblack = MAXCON800; |
| 159 | int blackcount; |
| 160 | int clients; |
| 161 | int debug; |
| 162 | int greylist = 1; |
| 163 | int grey_stutter = 10; |
| 164 | int verbose; |
| 165 | int stutter = 1; |
| 166 | int window; |
| 167 | int syncrecv; |
| 168 | int syncsend; |
| 169 | #define MAXTIME400 400 |
| 170 | |
| 171 | #define MAXIMUM(a,b)(((a)>(b))?(a):(b)) (((a)>(b))?(a):(b)) |
| 172 | |
| 173 | void |
| 174 | usage(void) |
| 175 | { |
| 176 | extern char *__progname; |
| 177 | |
| 178 | fprintf(stderr(&__sF[2]), |
| 179 | "usage: %s [-45bdv] [-B maxblack] [-C file] [-c maxcon] " |
| 180 | "[-G passtime:greyexp:whiteexp]\n" |
| 181 | "\t[-h hostname] [-K file] [-l address] [-M address] [-n name]\n" |
| 182 | "\t[-p port] [-S secs] [-s secs] " |
| 183 | "[-w window] [-Y synctarget] [-y synclisten]\n", |
| 184 | __progname); |
| 185 | |
| 186 | exit(1); |
| 187 | } |
| 188 | |
| 189 | char * |
| 190 | grow_obuf(struct con *cp, int off) |
| 191 | { |
| 192 | char *tmp; |
| 193 | |
| 194 | tmp = realloc(cp->obuf, cp->osize + 8192); |
| 195 | if (tmp == NULL((void*)0)) { |
| 196 | free(cp->obuf); |
| 197 | cp->obuf = NULL((void*)0); |
| 198 | cp->osize = 0; |
| 199 | return (NULL((void*)0)); |
| 200 | } else { |
| 201 | cp->osize += 8192; |
| 202 | cp->obuf = tmp; |
| 203 | return (cp->obuf + off); |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | int |
| 208 | parse_configline(char *line) |
| 209 | { |
| 210 | char *cp, prev, *name, *msg, *tmp; |
| 211 | char **v4 = NULL((void*)0), **v6 = NULL((void*)0); |
| 212 | const char *errstr; |
| 213 | u_int nv4 = 0, nv6 = 0; |
| 214 | int mdone = 0; |
| 215 | sa_family_t af; |
| 216 | |
| 217 | name = line; |
| 218 | |
| 219 | for (cp = name; *cp && *cp != ';'; cp++) |
| 220 | ; |
| 221 | if (*cp != ';') |
| 222 | goto parse_error; |
| 223 | *cp++ = '\0'; |
| 224 | if (!*cp) { |
| 225 | sdl_del(name); |
| 226 | return (0); |
| 227 | } |
| 228 | msg = cp; |
| 229 | if (*cp++ != '"') |
| 230 | goto parse_error; |
| 231 | prev = '\0'; |
| 232 | for (; !mdone; cp++) { |
| 233 | switch (*cp) { |
| 234 | case '\\': |
| 235 | if (!prev) |
| 236 | prev = *cp; |
| 237 | else |
| 238 | prev = '\0'; |
| 239 | break; |
| 240 | case '"': |
| 241 | if (prev != '\\') { |
| 242 | cp++; |
| 243 | if (*cp == ';') { |
| 244 | mdone = 1; |
| 245 | *cp = '\0'; |
| 246 | } else { |
| 247 | if (debug > 0) |
| 248 | printf("bad message: %s\n", msg); |
| 249 | goto parse_error; |
| 250 | } |
| 251 | } |
| 252 | break; |
| 253 | case '\0': |
| 254 | if (debug > 0) |
| 255 | printf("bad message: %s\n", msg); |
| 256 | goto parse_error; |
| 257 | default: |
| 258 | prev = '\0'; |
| 259 | break; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | while ((tmp = strsep(&cp, ";")) != NULL((void*)0)) { |
| 264 | char **av; |
| 265 | u_int au, ac; |
| 266 | |
| 267 | if (*tmp == '\0') |
| 268 | continue; |
| 269 | |
| 270 | if (strncmp(tmp, "inet", 4) != 0) |
| 271 | goto parse_error; |
| 272 | switch (tmp[4]) { |
| 273 | case '\0': |
| 274 | af = AF_INET2; |
| 275 | break; |
| 276 | case '6': |
| 277 | if (tmp[5] == '\0') { |
| 278 | af = AF_INET624; |
| 279 | break; |
| 280 | } |
| 281 | /* FALLTHROUGH */ |
| 282 | default: |
| 283 | if (debug > 0) |
| 284 | printf("unsupported address family: %s\n", tmp); |
| 285 | goto parse_error; |
| 286 | } |
| 287 | |
| 288 | tmp = strsep(&cp, ";"); |
| 289 | if (tmp == NULL((void*)0)) { |
| 290 | if (debug > 0) |
| 291 | printf("missing address count\n"); |
| 292 | goto parse_error; |
| 293 | } |
| 294 | ac = strtonum(tmp, 0, UINT_MAX(2147483647 *2U +1U), &errstr); |
| 295 | if (errstr != NULL((void*)0)) { |
| 296 | if (debug > 0) |
| 297 | printf("count \"%s\" is %s\n", tmp, errstr); |
| 298 | goto parse_error; |
| 299 | } |
| 300 | |
| 301 | av = reallocarray(NULL((void*)0), ac, sizeof(char *)); |
| 302 | for (au = 0; au < ac; au++) { |
| 303 | tmp = strsep(&cp, ";"); |
| 304 | if (tmp == NULL((void*)0)) { |
| 305 | if (debug > 0) |
| 306 | printf("expected %u addrs, got %u\n", |
| 307 | ac, au + 1); |
| 308 | free(av); |
| 309 | goto parse_error; |
| 310 | } |
| 311 | if (*tmp == '\0') |
| 312 | continue; |
| 313 | av[au] = tmp; |
| 314 | } |
| 315 | if (af == AF_INET2) { |
| 316 | if (v4 != NULL((void*)0)) { |
| 317 | if (debug > 0) |
| 318 | printf("duplicate inet\n"); |
| 319 | goto parse_error; |
| 320 | } |
| 321 | v4 = av; |
| 322 | nv4 = ac; |
| 323 | } else { |
| 324 | if (v6 != NULL((void*)0)) { |
| 325 | if (debug > 0) |
| 326 | printf("duplicate inet6\n"); |
| 327 | goto parse_error; |
| 328 | } |
| 329 | v6 = av; |
| 330 | nv6 = ac; |
| 331 | } |
| 332 | } |
| 333 | if (nv4 == 0 && nv6 == 0) { |
| 334 | if (debug > 0) |
| 335 | printf("no addresses\n"); |
| 336 | goto parse_error; |
| 337 | } |
| 338 | sdl_add(name, msg, v4, nv4, v6, nv6); |
| 339 | free(v4); |
| 340 | free(v6); |
| 341 | return (0); |
| 342 | |
| 343 | parse_error: |
| 344 | if (debug > 0) |
| 345 | printf("bogus config line - need 'tag;message;af;count;a/m;a/m;a/m...'\n"); |
| 346 | free(v4); |
| 347 | free(v6); |
| 348 | return (-1); |
| 349 | } |
| 350 | |
| 351 | void |
| 352 | parse_configs(void) |
| 353 | { |
| 354 | char *start, *end; |
| 355 | size_t i; |
| 356 | |
| 357 | /* We always leave an extra byte for the NUL. */ |
| 358 | cb[cbu++] = '\0'; |
| 359 | |
| 360 | start = cb; |
| 361 | end = start; |
| 362 | for (i = 0; i < cbu; i++) { |
| 363 | if (*end == '\n') { |
| 364 | *end = '\0'; |
| 365 | if (end > start + 1) |
| 366 | parse_configline(start); |
| 367 | start = ++end; |
| 368 | } else |
| 369 | ++end; |
| 370 | } |
| 371 | if (end > start + 1) |
| 372 | parse_configline(start); |
| 373 | } |
| 374 | |
| 375 | void |
| 376 | do_config(void) |
| 377 | { |
| 378 | int n; |
| 379 | |
| 380 | if (debug > 0) |
| 381 | printf("got configuration connection\n"); |
| 382 | |
| 383 | /* Leave an extra byte for the terminating NUL. */ |
| 384 | if (cbu + 1 >= cbs) { |
| 385 | char *tmp; |
| 386 | |
| 387 | tmp = realloc(cb, cbs + (1024 * 1024)); |
| 388 | if (tmp == NULL((void*)0)) { |
| 389 | if (debug > 0) |
| 390 | warn("realloc"); |
| 391 | goto configdone; |
| 392 | } |
| 393 | cbs += 1024 * 1024; |
| 394 | cb = tmp; |
| 395 | } |
| 396 | |
| 397 | n = read(conffd, cb + cbu, cbs - cbu); |
| 398 | if (debug > 0) |
| 399 | printf("read %d config bytes\n", n); |
| 400 | if (n == 0) { |
| 401 | if (cbu != 0) |
| 402 | parse_configs(); |
| 403 | goto configdone; |
| 404 | } else if (n == -1) { |
| 405 | if (debug > 0) |
| 406 | warn("read"); |
| 407 | goto configdone; |
| 408 | } else |
| 409 | cbu += n; |
| 410 | return; |
| 411 | |
| 412 | configdone: |
| 413 | free(cb); |
| 414 | cb = NULL((void*)0); |
| 415 | cbs = 0; |
| 416 | cbu = 0; |
| 417 | close(conffd); |
| 418 | conffd = -1; |
| 419 | slowdowntill = 0; |
| 420 | } |
| 421 | |
| 422 | int |
| 423 | read_configline(FILE *config) |
| 424 | { |
| 425 | char *buf; |
| 426 | size_t len; |
| 427 | |
| 428 | if ((buf = fgetln(config, &len))) { |
| 429 | if (buf[len - 1] == '\n') |
| 430 | buf[len - 1] = '\0'; |
| 431 | else |
| 432 | return (-1); /* all valid lines end in \n */ |
| 433 | parse_configline(buf); |
| 434 | } else { |
| 435 | syslog_r(LOG_DEBUG7, &sdata, "read_configline: fgetln (%m)"); |
| 436 | return (-1); |
| 437 | } |
| 438 | return (0); |
| 439 | } |
| 440 | |
| 441 | void |
| 442 | spamd_tls_init() |
| 443 | { |
| 444 | if (tlskeyfile == NULL((void*)0) && tlscertfile == NULL((void*)0)) |
| 445 | return; |
| 446 | if (tlskeyfile == NULL((void*)0) || tlscertfile == NULL((void*)0)) |
| 447 | errx(1, "need key and certificate for TLS"); |
| 448 | |
| 449 | if ((tlscfg = tls_config_new()) == NULL((void*)0)) |
| 450 | errx(1, "failed to get tls config"); |
| 451 | if ((tlsctx = tls_server()) == NULL((void*)0)) |
| 452 | errx(1, "failed to get tls server"); |
| 453 | |
| 454 | if (tls_config_set_protocols(tlscfg, TLS_PROTOCOLS_ALL((1 << 1)|(1 << 2)| (1 << 3)|(1 << 4) )) != 0) |
| 455 | errx(1, "failed to set tls protocols"); |
| 456 | |
| 457 | /* might need user-specified ciphers, tls_config_set_ciphers */ |
| 458 | if (tls_config_set_ciphers(tlscfg, "all") != 0) |
| 459 | errx(1, "failed to set tls ciphers"); |
| 460 | |
| 461 | if (tls_config_set_cert_file(tlscfg, tlscertfile) == -1) |
| 462 | errx(1, "unable to set TLS certificate file %s", tlscertfile); |
| 463 | if (tls_config_set_key_file(tlscfg, tlskeyfile) == -1) |
| 464 | errx(1, "unable to set TLS key file %s", tlskeyfile); |
| 465 | if (tls_configure(tlsctx, tlscfg) != 0) |
| 466 | errx(1, "failed to configure TLS - %s", tls_error(tlsctx)); |
| 467 | |
| 468 | /* set hostname to cert's CN unless explicitly given? */ |
| 469 | } |
| 470 | |
| 471 | int |
| 472 | append_error_string(struct con *cp, size_t off, char *fmt, int af, void *ia) |
| 473 | { |
| 474 | char sav = '\0'; |
| 475 | static int lastcont = 0; |
| 476 | char *c = cp->obuf + off; |
| 477 | char *s = fmt; |
| 478 | size_t len = cp->osize - off; |
| 479 | int i = 0; |
| 480 | |
| 481 | if (off == 0) |
| 482 | lastcont = 0; |
| 483 | |
| 484 | if (lastcont != 0) |
| 485 | cp->obuf[lastcont] = '-'; |
| 486 | snprintf(c, len, "%s ", nreply); |
| 487 | i += strlen(c); |
| 488 | lastcont = off + i - 1; |
| 489 | if (*s == '"') |
| 490 | s++; |
| 491 | while (*s) { |
| 492 | /* |
| 493 | * Make sure we at minimum, have room to add a |
| 494 | * format code (4 bytes), and a v6 address(39 bytes) |
| 495 | * and a byte saved in sav. |
| 496 | */ |
| 497 | if (i >= len - 46) { |
| 498 | c = grow_obuf(cp, off); |
| 499 | if (c == NULL((void*)0)) |
| 500 | return (-1); |
| 501 | len = cp->osize - (off + i); |
| 502 | } |
| 503 | |
| 504 | if (c[i-1] == '\n') { |
| 505 | if (lastcont != 0) |
| 506 | cp->obuf[lastcont] = '-'; |
| 507 | snprintf(c + i, len, "%s ", nreply); |
| 508 | i += strlen(c); |
| 509 | lastcont = off + i - 1; |
| 510 | } |
| 511 | |
| 512 | switch (*s) { |
| 513 | case '\\': |
| 514 | case '%': |
| 515 | if (!sav) |
| 516 | sav = *s; |
| 517 | else { |
| 518 | c[i++] = sav; |
| 519 | sav = '\0'; |
| 520 | c[i] = '\0'; |
| 521 | } |
| 522 | break; |
| 523 | case '"': |
| 524 | case 'A': |
| 525 | case 'n': |
| 526 | if (*(s+1) == '\0') { |
| 527 | break; |
| 528 | } |
| 529 | if (sav == '\\' && *s == 'n') { |
| 530 | c[i++] = '\n'; |
| 531 | sav = '\0'; |
| 532 | c[i] = '\0'; |
| 533 | break; |
| 534 | } else if (sav == '\\' && *s == '"') { |
| 535 | c[i++] = '"'; |
| 536 | sav = '\0'; |
| 537 | c[i] = '\0'; |
| 538 | break; |
| 539 | } else if (sav == '%' && *s == 'A') { |
| 540 | inet_ntop(af, ia, c + i, (len - i)); |
| 541 | i += strlen(c + i); |
| 542 | sav = '\0'; |
| 543 | break; |
| 544 | } |
| 545 | /* FALLTHROUGH */ |
| 546 | default: |
| 547 | if (sav) |
| 548 | c[i++] = sav; |
| 549 | c[i++] = *s; |
| 550 | sav = '\0'; |
| 551 | c[i] = '\0'; |
| 552 | break; |
| 553 | } |
| 554 | s++; |
| 555 | } |
| 556 | return (i); |
| 557 | } |
| 558 | |
| 559 | char * |
| 560 | loglists(struct con *cp) |
| 561 | { |
| 562 | static char matchlists[80]; |
| 563 | struct sdlist **matches; |
| 564 | int s = sizeof(matchlists) - 4; |
| 565 | |
| 566 | matchlists[0] = '\0'; |
| 567 | matches = cp->blacklists; |
| 568 | if (matches == NULL((void*)0)) |
| 569 | return (NULL((void*)0)); |
| 570 | for (; *matches; matches++) { |
| 571 | |
| 572 | /* don't report an insane amount of lists in the logs. |
| 573 | * just truncate and indicate with ... |
| 574 | */ |
| 575 | if (strlen(matchlists) + strlen(matches[0]->tag) + 1 >= s) |
| 576 | strlcat(matchlists, " ...", sizeof(matchlists)); |
| 577 | else { |
| 578 | strlcat(matchlists, " ", s); |
| 579 | strlcat(matchlists, matches[0]->tag, s); |
| 580 | } |
| 581 | } |
| 582 | return matchlists; |
| 583 | } |
| 584 | |
| 585 | void |
| 586 | doreply(struct con *cp) |
| 587 | { |
| 588 | struct sdlist **matches; |
| 589 | int off = 0; |
| 590 | |
| 591 | matches = cp->blacklists; |
| 592 | if (matches == NULL((void*)0)) |
| 593 | goto nomatch; |
| 594 | for (; *matches; matches++) { |
| 595 | int used = 0; |
| 596 | int left = cp->osize - off; |
| 597 | |
| 598 | used = append_error_string(cp, off, matches[0]->string, |
| 599 | cp->af, cp->ia); |
| 600 | if (used == -1) |
| 601 | goto bad; |
| 602 | off += used; |
| 603 | left -= used; |
| 604 | if (cp->obuf[off - 1] != '\n') { |
| 605 | if (left < 1) { |
| 606 | if (grow_obuf(cp, off) == NULL((void*)0)) |
| 607 | goto bad; |
| 608 | } |
| 609 | cp->obuf[off++] = '\n'; |
| 610 | cp->obuf[off] = '\0'; |
| 611 | } |
| 612 | } |
| 613 | return; |
| 614 | nomatch: |
| 615 | /* No match. give generic reply */ |
| 616 | free(cp->obuf); |
| 617 | if (cp->blacklists != NULL((void*)0)) |
| 618 | cp->osize = asprintf(&cp->obuf, |
| 619 | "%s-Sorry %s\n" |
| 620 | "%s-You are trying to send mail from an address " |
| 621 | "listed by one\n" |
| 622 | "%s or more IP-based registries as being a SPAM source.\n", |
| 623 | nreply, cp->addr, nreply, nreply); |
| 624 | else |
| 625 | cp->osize = asprintf(&cp->obuf, |
| 626 | "451 Temporary failure, please try again later.\r\n"); |
| 627 | if (cp->osize == -1) |
| 628 | cp->obuf = NULL((void*)0); |
| 629 | cp->osize++; /* size includes the NUL (also changes -1 to 0) */ |
| 630 | return; |
| 631 | bad: |
| 632 | if (cp->obuf != NULL((void*)0)) { |
| 633 | free(cp->obuf); |
| 634 | cp->obuf = NULL((void*)0); |
| 635 | cp->osize = 0; |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | void |
| 640 | setlog(char *p, size_t len, char *f) |
| 641 | { |
| 642 | char *s; |
| 643 | |
| 644 | s = strsep(&f, ":"); |
Value stored to 's' is never read | |
| 645 | if (!f) |
| 646 | return; |
| 647 | while (*f == ' ' || *f == '\t') |
| 648 | f++; |
| 649 | s = strsep(&f, " \t"); |
| 650 | if (s == NULL((void*)0)) |
| 651 | return; |
| 652 | strlcpy(p, s, len); |
| 653 | s = strsep(&p, " \t\n\r"); |
| 654 | if (s == NULL((void*)0)) |
| 655 | return; |
| 656 | s = strsep(&p, " \t\n\r"); |
| 657 | if (s) |
| 658 | *s = '\0'; |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * Get address client connected to, by doing a getsockname call. |
| 663 | * Must not be used with a NAT'ed connection (use divert-to instead of rdr-to). |
| 664 | */ |
| 665 | void |
| 666 | getcaddr(struct con *cp) |
| 667 | { |
| 668 | struct sockaddr_storage original_destination; |
| 669 | struct sockaddr *odp = (struct sockaddr *) &original_destination; |
| 670 | socklen_t len = sizeof(struct sockaddr_storage); |
| 671 | int error; |
| 672 | |
| 673 | cp->caddr[0] = '\0'; |
| 674 | if (getsockname(cp->pfd->fd, odp, &len) == -1) |
| 675 | return; |
| 676 | error = getnameinfo(odp, odp->sa_len, cp->caddr, sizeof(cp->caddr), |
| 677 | NULL((void*)0), 0, NI_NUMERICHOST1); |
| 678 | if (error) |
| 679 | cp->caddr[0] = '\0'; |
| 680 | } |
| 681 | |
| 682 | void |
| 683 | gethelo(char *p, size_t len, char *f) |
| 684 | { |
| 685 | char *s; |
| 686 | |
| 687 | /* skip HELO/EHLO */ |
| 688 | f+=4; |
| 689 | /* skip whitespace */ |
| 690 | while (*f == ' ' || *f == '\t') |
| 691 | f++; |
| 692 | s = strsep(&f, " \t"); |
| 693 | if (s == NULL((void*)0)) |
| 694 | return; |
| 695 | strlcpy(p, s, len); |
| 696 | s = strsep(&p, " \t\n\r"); |
| 697 | if (s == NULL((void*)0)) |
| 698 | return; |
| 699 | s = strsep(&p, " \t\n\r"); |
| 700 | if (s) |
| 701 | *s = '\0'; |
| 702 | } |
| 703 | |
| 704 | void |
| 705 | initcon(struct con *cp, int fd, struct sockaddr *sa) |
| 706 | { |
| 707 | struct pollfd *pfd = cp->pfd; |
| 708 | char ctimebuf[26]; |
| 709 | time_t tt; |
| 710 | int error; |
| 711 | |
| 712 | if (sa->sa_family != AF_INET2) |
| 713 | errx(1, "not supported yet"); |
| 714 | |
| 715 | time(&tt); |
| 716 | free(cp->obuf); |
| 717 | free(cp->blacklists); |
| 718 | free(cp->lists); |
| 719 | memset(cp, 0, sizeof(*cp)); |
| 720 | if (grow_obuf(cp, 0) == NULL((void*)0)) |
| 721 | err(1, "malloc"); |
| 722 | cp->pfd = pfd; |
| 723 | cp->pfd->fd = fd; |
| 724 | memcpy(&cp->ss, sa, sa->sa_len); |
| 725 | cp->af = sa->sa_family; |
| 726 | cp->ia = &((struct sockaddr_in *)&cp->ss)->sin_addr; |
| 727 | cp->blacklists = sdl_lookup(blacklists, cp->af, cp->ia); |
| 728 | cp->stutter = (greylist && !grey_stutter && cp->blacklists == NULL((void*)0)) ? |
| 729 | 0 : stutter; |
| 730 | error = getnameinfo(sa, sa->sa_len, cp->addr, sizeof(cp->addr), NULL((void*)0), 0, |
| 731 | NI_NUMERICHOST1); |
| 732 | #ifdef useless |
| 733 | if (error) |
| 734 | errx(1, "%s", gai_strerror(error)); |
| 735 | #endif |
| 736 | ctime_r(&t, ctimebuf); |
| 737 | ctimebuf[sizeof(ctimebuf) - 2] = '\0'; /* nuke newline */ |
| 738 | snprintf(cp->obuf, cp->osize, "220 %s ESMTP %s; %s\r\n", |
| 739 | hostname, spamd, ctimebuf); |
| 740 | cp->op = cp->obuf; |
| 741 | cp->ol = strlen(cp->op); |
| 742 | cp->w = tt + cp->stutter; |
| 743 | cp->s = tt; |
| 744 | strlcpy(cp->rend, "\n", sizeof cp->rend); |
| 745 | clients++; |
| 746 | if (cp->blacklists != NULL((void*)0)) { |
| 747 | blackcount++; |
| 748 | if (greylist && blackcount > maxblack) |
| 749 | cp->stutter = 0; |
| 750 | cp->lists = strdup(loglists(cp)); |
| 751 | if (cp->lists == NULL((void*)0)) |
| 752 | err(1, "malloc"); |
| 753 | } |
| 754 | else |
| 755 | cp->lists = NULL((void*)0); |
| 756 | } |
| 757 | |
| 758 | void |
| 759 | closecon(struct con *cp) |
| 760 | { |
| 761 | time_t tt; |
| 762 | |
| 763 | if (cp->cctx) { |
| 764 | tls_close(cp->cctx); |
| 765 | tls_free(cp->cctx); |
| 766 | } |
| 767 | close(cp->pfd->fd); |
| 768 | cp->pfd->fd = -1; |
| 769 | |
| 770 | slowdowntill = 0; |
| 771 | |
| 772 | time(&tt); |
| 773 | syslog_r(LOG_INFO6, &sdata, "%s: disconnected after %lld seconds.%s%s", |
| 774 | cp->addr, (long long)(tt - cp->s), |
| 775 | ((cp->lists == NULL((void*)0)) ? "" : " lists:"), |
| 776 | ((cp->lists == NULL((void*)0)) ? "": cp->lists)); |
| 777 | if (debug > 0) |
| 778 | printf("%s connected for %lld seconds.\n", cp->addr, |
| 779 | (long long)(tt - cp->s)); |
| 780 | free(cp->lists); |
| 781 | cp->lists = NULL((void*)0); |
| 782 | if (cp->blacklists != NULL((void*)0)) { |
| 783 | blackcount--; |
| 784 | free(cp->blacklists); |
| 785 | cp->blacklists = NULL((void*)0); |
| 786 | } |
| 787 | if (cp->obuf != NULL((void*)0)) { |
| 788 | free(cp->obuf); |
| 789 | cp->obuf = NULL((void*)0); |
| 790 | cp->osize = 0; |
| 791 | } |
| 792 | clients--; |
| 793 | } |
| 794 | |
| 795 | int |
| 796 | match(const char *s1, const char *s2) |
| 797 | { |
| 798 | return (strncasecmp(s1, s2, strlen(s2)) == 0); |
| 799 | } |
| 800 | |
| 801 | void |
| 802 | nextstate(struct con *cp) |
| 803 | { |
| 804 | if (match(cp->ibuf, "QUIT") && cp->state < 99) { |
| 805 | snprintf(cp->obuf, cp->osize, "221 %s\r\n", hostname); |
| 806 | cp->op = cp->obuf; |
| 807 | cp->ol = strlen(cp->op); |
| 808 | cp->w = t + cp->stutter; |
| 809 | cp->laststate = cp->state; |
| 810 | cp->state = 99; |
| 811 | return; |
| 812 | } |
| 813 | |
| 814 | if (match(cp->ibuf, "RSET") && cp->state > 2 && cp->state < 50) { |
| 815 | snprintf(cp->obuf, cp->osize, |
| 816 | "250 Ok to start over.\r\n"); |
| 817 | cp->op = cp->obuf; |
| 818 | cp->ol = strlen(cp->op); |
| 819 | cp->w = t + cp->stutter; |
| 820 | cp->laststate = cp->state; |
| 821 | cp->state = 2; |
| 822 | return; |
| 823 | } |
| 824 | switch (cp->state) { |
| 825 | case 0: |
| 826 | tlsinitdone: |
| 827 | /* banner sent; wait for input */ |
| 828 | cp->ip = cp->ibuf; |
| 829 | cp->il = sizeof(cp->ibuf) - 1; |
| 830 | cp->laststate = cp->state; |
| 831 | cp->state = 1; |
| 832 | cp->r = t; |
| 833 | break; |
| 834 | case 1: |
| 835 | /* received input: parse, and select next state */ |
| 836 | if (match(cp->ibuf, "HELO") || |
| 837 | match(cp->ibuf, "EHLO")) { |
| 838 | int nextstate = 2; |
| 839 | cp->helo[0] = '\0'; |
| 840 | gethelo(cp->helo, sizeof cp->helo, cp->ibuf); |
| 841 | if (cp->helo[0] == '\0') { |
| 842 | nextstate = 0; |
| 843 | snprintf(cp->obuf, cp->osize, |
| 844 | "501 helo requires domain name.\r\n"); |
| 845 | } else { |
| 846 | if (cp->cctx == NULL((void*)0) && tlsctx != NULL((void*)0) && |
| 847 | cp->blacklists == NULL((void*)0) && |
| 848 | match(cp->ibuf, "EHLO")) { |
| 849 | snprintf(cp->obuf, cp->osize, |
| 850 | "250-%s\r\n" |
| 851 | "250 STARTTLS\r\n", |
| 852 | hostname); |
| 853 | nextstate = 7; |
| 854 | } else { |
| 855 | snprintf(cp->obuf, cp->osize, |
| 856 | "250 Hello, spam sender. Pleased " |
| 857 | "to be wasting your time.\r\n"); |
| 858 | } |
| 859 | } |
| 860 | cp->op = cp->obuf; |
| 861 | cp->ol = strlen(cp->op); |
| 862 | cp->laststate = cp->state; |
| 863 | cp->state = nextstate; |
| 864 | cp->w = t + cp->stutter; |
| 865 | break; |
| 866 | } |
| 867 | goto mail; |
| 868 | case 2: |
| 869 | /* sent 250 Hello, wait for input */ |
| 870 | cp->ip = cp->ibuf; |
| 871 | cp->il = sizeof(cp->ibuf) - 1; |
| 872 | cp->laststate = cp->state; |
| 873 | cp->state = 3; |
| 874 | cp->r = t; |
| 875 | break; |
| 876 | case 3: |
| 877 | mail: |
| 878 | if (match(cp->ibuf, "MAIL")) { |
| 879 | setlog(cp->mail, sizeof cp->mail, cp->ibuf); |
| 880 | snprintf(cp->obuf, cp->osize, |
| 881 | "250 You are about to try to deliver spam. " |
| 882 | "Your time will be spent, for nothing.\r\n"); |
| 883 | cp->op = cp->obuf; |
| 884 | cp->ol = strlen(cp->op); |
| 885 | cp->laststate = cp->state; |
| 886 | cp->state = 4; |
| 887 | cp->w = t + cp->stutter; |
| 888 | break; |
| 889 | } |
| 890 | goto rcpt; |
| 891 | case 4: |
| 892 | /* sent 250 Sender ok */ |
| 893 | cp->ip = cp->ibuf; |
| 894 | cp->il = sizeof(cp->ibuf) - 1; |
| 895 | cp->laststate = cp->state; |
| 896 | cp->state = 5; |
| 897 | cp->r = t; |
| 898 | break; |
| 899 | case 5: |
| 900 | rcpt: |
| 901 | if (match(cp->ibuf, "RCPT")) { |
| 902 | setlog(cp->rcpt, sizeof(cp->rcpt), cp->ibuf); |
| 903 | snprintf(cp->obuf, cp->osize, |
| 904 | "250 This is hurting you more than it is " |
| 905 | "hurting me.\r\n"); |
| 906 | cp->op = cp->obuf; |
| 907 | cp->ol = strlen(cp->op); |
| 908 | cp->laststate = cp->state; |
| 909 | cp->state = 6; |
| 910 | cp->w = t + cp->stutter; |
| 911 | |
| 912 | if (cp->mail[0] && cp->rcpt[0]) { |
| 913 | if (verbose) |
| 914 | syslog_r(LOG_INFO6, &sdata, |
| 915 | "(%s) %s: %s -> %s", |
| 916 | cp->blacklists ? "BLACK" : "GREY", |
| 917 | cp->addr, cp->mail, |
| 918 | cp->rcpt); |
| 919 | if (debug) |
| 920 | fprintf(stderr(&__sF[2]), "(%s) %s: %s -> %s\n", |
| 921 | cp->blacklists ? "BLACK" : "GREY", |
| 922 | cp->addr, cp->mail, cp->rcpt); |
| 923 | if (greylist && cp->blacklists == NULL((void*)0)) { |
| 924 | /* send this info to the greylister */ |
| 925 | getcaddr(cp); |
| 926 | fprintf(grey, |
| 927 | "CO:%s\nHE:%s\nIP:%s\nFR:%s\nTO:%s\n", |
| 928 | cp->caddr, cp->helo, cp->addr, |
| 929 | cp->mail, cp->rcpt); |
| 930 | fflush(grey); |
| 931 | } |
| 932 | } |
| 933 | break; |
| 934 | } |
| 935 | goto spam; |
| 936 | case 6: |
| 937 | /* sent 250 blah */ |
| 938 | cp->ip = cp->ibuf; |
| 939 | cp->il = sizeof(cp->ibuf) - 1; |
| 940 | cp->laststate = cp->state; |
| 941 | cp->state = 5; |
| 942 | cp->r = t; |
| 943 | break; |
| 944 | case 7: |
| 945 | /* sent 250 STARTTLS, wait for input */ |
| 946 | cp->ip = cp->ibuf; |
| 947 | cp->il = sizeof(cp->ibuf) - 1; |
| 948 | cp->laststate = cp->state; |
| 949 | cp->state = 8; |
| 950 | cp->r = t; |
| 951 | break; |
| 952 | case 8: |
| 953 | if (tlsctx != NULL((void*)0) && cp->blacklists == NULL((void*)0) && |
| 954 | cp->cctx == NULL((void*)0) && match(cp->ibuf, "STARTTLS")) { |
| 955 | snprintf(cp->obuf, cp->osize, |
| 956 | "220 glad you want to burn more CPU cycles on " |
| 957 | "your spam\r\n"); |
| 958 | cp->op = cp->obuf; |
| 959 | cp->ol = strlen(cp->op); |
| 960 | cp->laststate = cp->state; |
| 961 | cp->state = 9; |
| 962 | cp->w = t + cp->stutter; |
| 963 | break; |
| 964 | } |
| 965 | goto mail; |
| 966 | case 9: |
| 967 | if (tls_accept_socket(tlsctx, &cp->cctx, cp->pfd->fd) == -1) { |
| 968 | snprintf(cp->obuf, cp->osize, |
| 969 | "500 STARTTLS failed\r\n"); |
| 970 | cp->op = cp->obuf; |
| 971 | cp->ol = strlen(cp->op); |
| 972 | cp->laststate = cp->state; |
| 973 | cp->state = 98; |
| 974 | goto done; |
| 975 | } |
| 976 | goto tlsinitdone; |
| 977 | |
| 978 | case 50: |
| 979 | spam: |
| 980 | if (match(cp->ibuf, "DATA")) { |
| 981 | snprintf(cp->obuf, cp->osize, |
| 982 | "354 Enter spam, end with \".\" on a line by " |
| 983 | "itself\r\n"); |
| 984 | cp->state = 60; |
| 985 | if (window && setsockopt(cp->pfd->fd, SOL_SOCKET0xffff, |
| 986 | SO_RCVBUF0x1002, &window, sizeof(window)) == -1) { |
| 987 | syslog_r(LOG_DEBUG7, &sdata,"setsockopt: %m"); |
| 988 | /* don't fail if this doesn't work. */ |
| 989 | } |
| 990 | cp->ip = cp->ibuf; |
| 991 | cp->il = sizeof(cp->ibuf) - 1; |
| 992 | cp->op = cp->obuf; |
| 993 | cp->ol = strlen(cp->op); |
| 994 | cp->w = t + cp->stutter; |
| 995 | if (greylist && cp->blacklists == NULL((void*)0)) { |
| 996 | cp->laststate = cp->state; |
| 997 | cp->state = 98; |
| 998 | goto done; |
| 999 | } |
| 1000 | } else { |
| 1001 | if (match(cp->ibuf, "NOOP")) |
| 1002 | snprintf(cp->obuf, cp->osize, |
| 1003 | "250 2.0.0 OK I did nothing\r\n"); |
| 1004 | else { |
| 1005 | snprintf(cp->obuf, cp->osize, |
| 1006 | "500 5.5.1 Command unrecognized\r\n"); |
| 1007 | cp->badcmd++; |
| 1008 | if (cp->badcmd > 20) { |
| 1009 | cp->laststate = cp->state; |
| 1010 | cp->state = 98; |
| 1011 | goto done; |
| 1012 | } |
| 1013 | } |
| 1014 | cp->state = cp->laststate; |
| 1015 | cp->ip = cp->ibuf; |
| 1016 | cp->il = sizeof(cp->ibuf) - 1; |
| 1017 | cp->op = cp->obuf; |
| 1018 | cp->ol = strlen(cp->op); |
| 1019 | cp->w = t + cp->stutter; |
| 1020 | } |
| 1021 | break; |
| 1022 | case 60: |
| 1023 | /* sent 354 blah */ |
| 1024 | cp->ip = cp->ibuf; |
| 1025 | cp->il = sizeof(cp->ibuf) - 1; |
| 1026 | cp->laststate = cp->state; |
| 1027 | cp->state = 70; |
| 1028 | cp->r = t; |
| 1029 | break; |
| 1030 | case 70: { |
| 1031 | char *p, *q; |
| 1032 | |
| 1033 | for (p = q = cp->ibuf; q <= cp->ip; ++q) |
| 1034 | if (*q == '\n' || q == cp->ip) { |
| 1035 | *q = 0; |
| 1036 | if (q > p && q[-1] == '\r') |
| 1037 | q[-1] = 0; |
| 1038 | if (!strcmp(p, ".") || |
| 1039 | (cp->data_body && ++cp->data_lines >= 10)) { |
| 1040 | cp->laststate = cp->state; |
| 1041 | cp->state = 98; |
| 1042 | goto done; |
| 1043 | } |
| 1044 | if (!cp->data_body && !*p) |
| 1045 | cp->data_body = 1; |
| 1046 | if (verbose && cp->data_body && *p) |
| 1047 | syslog_r(LOG_DEBUG7, &sdata, "%s: " |
| 1048 | "Body: %s", cp->addr, p); |
| 1049 | else if (verbose && (match(p, "FROM:") || |
| 1050 | match(p, "TO:") || match(p, "SUBJECT:"))) |
| 1051 | syslog_r(LOG_INFO6, &sdata, "%s: %s", |
| 1052 | cp->addr, p); |
| 1053 | p = ++q; |
| 1054 | } |
| 1055 | cp->ip = cp->ibuf; |
| 1056 | cp->il = sizeof(cp->ibuf) - 1; |
| 1057 | cp->r = t; |
| 1058 | break; |
| 1059 | } |
| 1060 | case 98: |
| 1061 | done: |
| 1062 | doreply(cp); |
| 1063 | cp->op = cp->obuf; |
| 1064 | cp->ol = strlen(cp->op); |
| 1065 | cp->w = t + cp->stutter; |
| 1066 | cp->laststate = cp->state; |
| 1067 | cp->state = 99; |
| 1068 | break; |
| 1069 | case 99: |
| 1070 | closecon(cp); |
| 1071 | break; |
| 1072 | default: |
| 1073 | errx(1, "illegal state %d", cp->state); |
| 1074 | break; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | void |
| 1079 | handler(struct con *cp) |
| 1080 | { |
| 1081 | int end = 0; |
| 1082 | ssize_t n; |
| 1083 | |
| 1084 | if (cp->r || cp->tlsaction != SPAMD_TLS_ACT_NONE0) { |
| 1085 | if (cp->cctx) { |
| 1086 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1087 | n = tls_read(cp->cctx, cp->ip, cp->il); |
| 1088 | if (n == TLS_WANT_POLLIN-2) |
| 1089 | cp->tlsaction = SPAMD_TLS_ACT_READ_POLLIN1; |
| 1090 | if (n == TLS_WANT_POLLOUT-3) |
| 1091 | cp->tlsaction = SPAMD_TLS_ACT_READ_POLLOUT2; |
| 1092 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1093 | return; |
| 1094 | } else |
| 1095 | n = read(cp->pfd->fd, cp->ip, cp->il); |
| 1096 | |
| 1097 | if (n == 0) |
| 1098 | closecon(cp); |
| 1099 | else if (n == -1) { |
| 1100 | if (errno(*__errno()) == EAGAIN35) |
| 1101 | return; |
| 1102 | if (debug > 0) |
| 1103 | warn("read"); |
| 1104 | closecon(cp); |
| 1105 | } else { |
| 1106 | cp->ip[n] = '\0'; |
| 1107 | if (cp->rend[0]) |
| 1108 | if (strpbrk(cp->ip, cp->rend)) |
| 1109 | end = 1; |
| 1110 | cp->ip += n; |
| 1111 | cp->il -= n; |
| 1112 | } |
| 1113 | } |
| 1114 | if (end || cp->il == 0) { |
| 1115 | while (cp->ip > cp->ibuf && |
| 1116 | (cp->ip[-1] == '\r' || cp->ip[-1] == '\n')) |
| 1117 | cp->ip--; |
| 1118 | *cp->ip = '\0'; |
| 1119 | cp->r = 0; |
| 1120 | nextstate(cp); |
| 1121 | } |
| 1122 | } |
| 1123 | |
| 1124 | void |
| 1125 | handlew(struct con *cp, int one) |
| 1126 | { |
| 1127 | ssize_t n; |
| 1128 | |
| 1129 | /* kill stutter on greylisted connections after initial delay */ |
| 1130 | if (cp->stutter && greylist && cp->blacklists == NULL((void*)0) && |
| 1131 | (t - cp->s) > grey_stutter) |
| 1132 | cp->stutter=0; |
| 1133 | |
| 1134 | if (cp->w || cp->tlsaction != SPAMD_TLS_ACT_NONE0) { |
| 1135 | if (*cp->op == '\n' && !cp->sr) { |
| 1136 | /* insert \r before \n */ |
| 1137 | if (cp->cctx) { |
| 1138 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1139 | n = tls_write(cp->cctx, "\r", 1); |
| 1140 | if (n == TLS_WANT_POLLIN-2) |
| 1141 | cp->tlsaction = |
| 1142 | SPAMD_TLS_ACT_WRITE_POLLIN3; |
| 1143 | if (n == TLS_WANT_POLLOUT-3) |
| 1144 | cp->tlsaction = |
| 1145 | SPAMD_TLS_ACT_WRITE_POLLOUT4; |
| 1146 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1147 | return; |
| 1148 | } else |
| 1149 | n = write(cp->pfd->fd, "\r", 1); |
| 1150 | |
| 1151 | if (n == 0) { |
| 1152 | closecon(cp); |
| 1153 | goto handled; |
| 1154 | } else if (n == -1) { |
| 1155 | if (errno(*__errno()) == EAGAIN35) |
| 1156 | return; |
| 1157 | if (debug > 0 && errno(*__errno()) != EPIPE32) |
| 1158 | warn("write"); |
| 1159 | closecon(cp); |
| 1160 | goto handled; |
| 1161 | } |
| 1162 | } |
| 1163 | if (*cp->op == '\r') |
| 1164 | cp->sr = 1; |
| 1165 | else |
| 1166 | cp->sr = 0; |
| 1167 | if (cp->cctx) { |
| 1168 | cp->tlsaction = SPAMD_TLS_ACT_NONE0; |
| 1169 | n = tls_write(cp->cctx, cp->op, cp->ol); |
| 1170 | if (n == TLS_WANT_POLLIN-2) |
| 1171 | cp->tlsaction = SPAMD_TLS_ACT_WRITE_POLLIN3; |
| 1172 | if (n == TLS_WANT_POLLOUT-3) |
| 1173 | cp->tlsaction = SPAMD_TLS_ACT_WRITE_POLLOUT4; |
| 1174 | if (cp->tlsaction != SPAMD_TLS_ACT_NONE0) |
| 1175 | return; |
| 1176 | } else |
| 1177 | n = write(cp->pfd->fd, cp->op, |
| 1178 | (one && cp->stutter) ? 1 : cp->ol); |
| 1179 | |
| 1180 | if (n == 0) |
| 1181 | closecon(cp); |
| 1182 | else if (n == -1) { |
| 1183 | if (errno(*__errno()) == EAGAIN35) |
| 1184 | return; |
| 1185 | if (debug > 0 && errno(*__errno()) != EPIPE32) |
| 1186 | warn("write"); |
| 1187 | closecon(cp); |
| 1188 | } else { |
| 1189 | cp->op += n; |
| 1190 | cp->ol -= n; |
| 1191 | } |
| 1192 | } |
| 1193 | handled: |
| 1194 | cp->w = t + cp->stutter; |
| 1195 | if (cp->ol == 0) { |
| 1196 | cp->w = 0; |
| 1197 | nextstate(cp); |
| 1198 | } |
| 1199 | } |
| 1200 | |
| 1201 | static int |
| 1202 | get_maxfiles(void) |
| 1203 | { |
| 1204 | int mib[2], maxfiles; |
| 1205 | size_t len; |
| 1206 | |
| 1207 | mib[0] = CTL_KERN1; |
| 1208 | mib[1] = KERN_MAXFILES7; |
| 1209 | len = sizeof(maxfiles); |
| 1210 | if (sysctl(mib, 2, &maxfiles, &len, NULL((void*)0), 0) == -1) |
| 1211 | return(MAXCON800); |
| 1212 | if ((maxfiles - 200) < 10) |
| 1213 | errx(1, "kern.maxfiles is only %d, can not continue\n", |
| 1214 | maxfiles); |
| 1215 | else |
| 1216 | return(maxfiles - 200); |
| 1217 | } |
| 1218 | |
| 1219 | /* Symbolic indexes for pfd[] below */ |
| 1220 | #define PFD_SMTPLISTEN0 0 |
| 1221 | #define PFD_CONFLISTEN1 1 |
| 1222 | #define PFD_SYNCFD2 2 |
| 1223 | #define PFD_CONFFD3 3 |
| 1224 | #define PFD_TRAPFD4 4 |
| 1225 | #define PFD_GREYBACK5 5 |
| 1226 | #define PFD_FIRSTCON6 6 |
| 1227 | |
| 1228 | int |
| 1229 | main(int argc, char *argv[]) |
| 1230 | { |
| 1231 | struct pollfd *pfd; |
| 1232 | struct sockaddr_in sin; |
| 1233 | struct sockaddr_in lin; |
| 1234 | int ch, smtplisten, conflisten, syncfd = -1, i, one = 1; |
| 1235 | u_short port; |
| 1236 | long long passt, greyt, whitet; |
| 1237 | struct servent *ent; |
| 1238 | struct rlimit rlp; |
| 1239 | char *bind_address = NULL((void*)0); |
| 1240 | const char *errstr; |
| 1241 | char *sync_iface = NULL((void*)0); |
| 1242 | char *sync_baddr = NULL((void*)0); |
| 1243 | struct addrinfo hints, *res; |
| 1244 | char *addr; |
| 1245 | char portstr[6]; |
| 1246 | int error; |
| 1247 | |
| 1248 | tzset(); |
| 1249 | openlog_r("spamd", LOG_PID0x01 | LOG_NDELAY0x08, LOG_DAEMON(3<<3), &sdata); |
| 1250 | |
| 1251 | if ((ent = getservbyname("spamd", "tcp")) == NULL((void*)0)) |
| 1252 | errx(1, "Can't find service \"spamd\" in /etc/services"); |
| 1253 | 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-cfg", "tcp")) == NULL((void*)0)) |
| 1255 | errx(1, "Can't find service \"spamd-cfg\" in /etc/services"); |
| 1256 | 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)); |
| 1257 | if ((ent = getservbyname("spamd-sync", "udp")) == NULL((void*)0)) |
| 1258 | errx(1, "Can't find service \"spamd-sync\" in /etc/services"); |
| 1259 | 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)); |
| 1260 | |
| 1261 | if (gethostname(hostname, sizeof hostname) == -1) |
| 1262 | err(1, "gethostname"); |
| 1263 | maxfiles = get_maxfiles(); |
| 1264 | if (maxcon > maxfiles) |
| 1265 | maxcon = maxfiles; |
| 1266 | if (maxblack > maxfiles) |
| 1267 | maxblack = maxfiles; |
| 1268 | while ((ch = |
| 1269 | getopt(argc, argv, "45l:c:B:p:bdG:h:s:S:M:n:vw:y:Y:C:K:")) != -1) { |
| 1270 | switch (ch) { |
| 1271 | case '4': |
| 1272 | nreply = "450"; |
| 1273 | break; |
| 1274 | case '5': |
| 1275 | nreply = "550"; |
| 1276 | break; |
| 1277 | case 'l': |
| 1278 | bind_address = optarg; |
| 1279 | break; |
| 1280 | case 'B': |
| 1281 | maxblack = strtonum(optarg, 0, INT_MAX2147483647, &errstr); |
| 1282 | if (errstr) |
| 1283 | errx(1, "-B %s: %s", optarg, errstr); |
| 1284 | break; |
| 1285 | case 'c': |
| 1286 | maxcon = strtonum(optarg, 1, maxfiles, &errstr); |
| 1287 | if (errstr) { |
| 1288 | fprintf(stderr(&__sF[2]), "-c %s: %s\n", optarg, errstr); |
| 1289 | usage(); |
| 1290 | } |
| 1291 | break; |
| 1292 | case 'p': |
| 1293 | port = strtonum(optarg, 1, USHRT_MAX(32767 *2 +1), &errstr); |
| 1294 | if (errstr) |
| 1295 | errx(1, "-p %s: %s", optarg, errstr); |
| 1296 | break; |
| 1297 | case 'd': |
| 1298 | debug = 1; |
| 1299 | break; |
| 1300 | case 'b': |
| 1301 | greylist = 0; |
| 1302 | break; |
| 1303 | case 'G': |
| 1304 | if (sscanf(optarg, "%lld:%lld:%lld", &passt, &greyt, |
| 1305 | &whitet) != 3) |
| 1306 | usage(); |
| 1307 | passtime = passt; |
| 1308 | greyexp = greyt; |
| 1309 | whiteexp = whitet; |
| 1310 | /* convert to seconds from minutes */ |
| 1311 | passtime *= 60; |
| 1312 | /* convert to seconds from hours */ |
| 1313 | whiteexp *= (60 * 60); |
| 1314 | /* convert to seconds from hours */ |
| 1315 | greyexp *= (60 * 60); |
| 1316 | break; |
| 1317 | case 'h': |
| 1318 | memset(hostname, 0, sizeof(hostname)); |
| 1319 | if (strlcpy(hostname, optarg, sizeof(hostname)) >= |
| 1320 | sizeof(hostname)) |
| 1321 | errx(1, "-h arg too long"); |
| 1322 | break; |
| 1323 | case 's': |
| 1324 | stutter = strtonum(optarg, 0, 10, &errstr); |
| 1325 | if (errstr) |
| 1326 | usage(); |
| 1327 | break; |
| 1328 | case 'S': |
| 1329 | grey_stutter = strtonum(optarg, 0, 90, &errstr); |
| 1330 | if (errstr) |
| 1331 | usage(); |
| 1332 | break; |
| 1333 | case 'M': |
| 1334 | low_prio_mx_ip = optarg; |
| 1335 | break; |
| 1336 | case 'n': |
| 1337 | spamd = optarg; |
| 1338 | break; |
| 1339 | case 'v': |
| 1340 | verbose = 1; |
| 1341 | break; |
| 1342 | case 'w': |
| 1343 | window = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 1344 | if (errstr) |
| 1345 | errx(1, "-w %s: %s", optarg, errstr); |
| 1346 | break; |
| 1347 | case 'Y': |
| 1348 | if (sync_addhost(optarg, sync_port) != 0) |
| 1349 | sync_iface = optarg; |
| 1350 | syncsend++; |
| 1351 | break; |
| 1352 | case 'y': |
| 1353 | sync_baddr = optarg; |
| 1354 | syncrecv++; |
| 1355 | break; |
| 1356 | case 'C': |
| 1357 | tlscertfile = optarg; |
| 1358 | break; |
| 1359 | case 'K': |
| 1360 | tlskeyfile = optarg; |
| 1361 | break; |
| 1362 | default: |
| 1363 | usage(); |
| 1364 | break; |
| 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | setproctitle("[priv]%s%s", |
| 1369 | greylist ? " (greylist)" : "", |
| 1370 | (syncrecv || syncsend) ? " (sync)" : ""); |
| 1371 | |
| 1372 | if (syncsend || syncrecv) { |
| 1373 | syncfd = sync_init(sync_iface, sync_baddr, sync_port); |
| 1374 | if (syncfd == -1) |
| 1375 | err(1, "sync init"); |
| 1376 | } |
| 1377 | |
| 1378 | if (geteuid()) |
| 1379 | errx(1, "need root privileges"); |
| 1380 | |
| 1381 | if ((pw = getpwnam(SPAMD_USER"_spamd")) == NULL((void*)0)) |
| 1382 | errx(1, "no such user %s", SPAMD_USER"_spamd"); |
| 1383 | |
| 1384 | if (!greylist) { |
| 1385 | maxblack = maxcon; |
| 1386 | } else if (maxblack > maxcon) |
| 1387 | usage(); |
| 1388 | |
| 1389 | spamd_tls_init(); |
| 1390 | |
| 1391 | rlp.rlim_cur = rlp.rlim_max = maxcon + 15; |
| 1392 | if (setrlimit(RLIMIT_NOFILE8, &rlp) == -1) |
| 1393 | err(1, "setrlimit"); |
| 1394 | |
| 1395 | pfd = reallocarray(NULL((void*)0), PFD_FIRSTCON6 + maxcon, sizeof(*pfd)); |
| 1396 | if (pfd == NULL((void*)0)) |
| 1397 | err(1, "reallocarray"); |
| 1398 | |
| 1399 | con = calloc(maxcon, sizeof(*con)); |
| 1400 | if (con == NULL((void*)0)) |
| 1401 | err(1, "calloc"); |
| 1402 | |
| 1403 | con->obuf = malloc(8192); |
| 1404 | |
| 1405 | if (con->obuf == NULL((void*)0)) |
| 1406 | err(1, "malloc"); |
| 1407 | con->osize = 8192; |
| 1408 | |
| 1409 | for (i = 0; i < maxcon; i++) { |
| 1410 | con[i].pfd = &pfd[PFD_FIRSTCON6 + i]; |
| 1411 | con[i].pfd->fd = -1; |
| 1412 | } |
| 1413 | |
| 1414 | signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1415 | |
| 1416 | smtplisten = socket(AF_INET2, SOCK_STREAM1, 0); |
| 1417 | if (smtplisten == -1) |
| 1418 | err(1, "socket"); |
| 1419 | |
| 1420 | if (setsockopt(smtplisten, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &one, |
| 1421 | sizeof(one)) == -1) |
| 1422 | return (-1); |
| 1423 | |
| 1424 | conflisten = socket(AF_INET2, SOCK_STREAM1, 0); |
| 1425 | if (conflisten == -1) |
| 1426 | err(1, "socket"); |
| 1427 | |
| 1428 | if (setsockopt(conflisten, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &one, |
| 1429 | sizeof(one)) == -1) |
| 1430 | return (-1); |
| 1431 | |
| 1432 | memset(&hints, 0, sizeof(hints)); |
| 1433 | hints.ai_family = AF_INET2; |
| 1434 | addr = bind_address; |
| 1435 | snprintf(portstr, sizeof(portstr), "%hu", port); |
| 1436 | |
| 1437 | if ((error = getaddrinfo(addr, portstr, &hints, &res)) != 0) { |
| 1438 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 1439 | } |
| 1440 | |
| 1441 | if (bind(smtplisten, res->ai_addr, res->ai_addrlen) == -1) { |
| 1442 | freeaddrinfo(res); |
| 1443 | err(1, "bind"); |
| 1444 | } |
| 1445 | freeaddrinfo(res); |
| 1446 | |
| 1447 | memset(&lin, 0, sizeof sin); |
| 1448 | lin.sin_len = sizeof(sin); |
| 1449 | 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)))); |
| 1450 | lin.sin_family = AF_INET2; |
| 1451 | 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)); |
| 1452 | |
| 1453 | if (bind(conflisten, (struct sockaddr *)&lin, sizeof lin) == -1) |
| 1454 | err(1, "bind local"); |
| 1455 | |
| 1456 | if (debug == 0) { |
| 1457 | if (daemon(1, 1) == -1) |
| 1458 | err(1, "daemon"); |
| 1459 | } |
| 1460 | |
| 1461 | if (greylist) { |
| 1462 | pfdev = open("/dev/pf", O_RDWR0x0002); |
| 1463 | if (pfdev == -1) { |
| 1464 | syslog_r(LOG_ERR3, &sdata, "open /dev/pf: %m"); |
| 1465 | exit(1); |
| 1466 | } |
| 1467 | |
| 1468 | check_spamd_db(); |
| 1469 | |
| 1470 | maxblack = (maxblack >= maxcon) ? maxcon - 100 : maxblack; |
| 1471 | if (maxblack < 0) |
| 1472 | maxblack = 0; |
| 1473 | |
| 1474 | /* open pipe to talk to greylister */ |
| 1475 | if (socketpair(AF_UNIX1, SOCK_DGRAM2, 0, greyback) == -1) { |
| 1476 | syslog(LOG_ERR3, "socketpair (%m)"); |
| 1477 | exit(1); |
| 1478 | } |
| 1479 | if (pipe(greypipe) == -1) { |
| 1480 | syslog(LOG_ERR3, "pipe (%m)"); |
| 1481 | exit(1); |
| 1482 | } |
| 1483 | /* open pipe to receive spamtrap configs */ |
| 1484 | if (pipe(trappipe) == -1) { |
| 1485 | syslog(LOG_ERR3, "pipe (%m)"); |
| 1486 | exit(1); |
| 1487 | } |
| 1488 | jail_pid = fork(); |
| 1489 | switch (jail_pid) { |
| 1490 | case -1: |
| 1491 | syslog(LOG_ERR3, "fork (%m)"); |
| 1492 | exit(1); |
| 1493 | case 0: |
| 1494 | /* child - continue */ |
| 1495 | signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1496 | grey = fdopen(greypipe[1], "w"); |
| 1497 | if (grey == NULL((void*)0)) { |
| 1498 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1499 | _exit(1); |
| 1500 | } |
| 1501 | close(greyback[0]); |
| 1502 | close(greypipe[0]); |
| 1503 | trapfd = trappipe[0]; |
| 1504 | trapcfg = fdopen(trappipe[0], "r"); |
| 1505 | if (trapcfg == NULL((void*)0)) { |
| 1506 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1507 | _exit(1); |
| 1508 | } |
| 1509 | close(trappipe[1]); |
| 1510 | |
| 1511 | if (setgroups(1, &pw->pw_gid) || |
| 1512 | setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || |
| 1513 | setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) |
| 1514 | err(1, "failed to drop privs"); |
| 1515 | |
| 1516 | goto jail; |
| 1517 | } |
| 1518 | /* parent - run greylister */ |
| 1519 | close(greyback[1]); |
| 1520 | grey = fdopen(greypipe[0], "r"); |
| 1521 | if (grey == NULL((void*)0)) { |
| 1522 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1523 | exit(1); |
| 1524 | } |
| 1525 | close(greypipe[1]); |
| 1526 | trapcfg = fdopen(trappipe[1], "w"); |
| 1527 | if (trapcfg == NULL((void*)0)) { |
| 1528 | syslog(LOG_ERR3, "fdopen (%m)"); |
| 1529 | exit(1); |
| 1530 | } |
| 1531 | close(trappipe[0]); |
| 1532 | return (greywatcher()); |
| 1533 | } |
| 1534 | |
| 1535 | jail: |
| 1536 | if (pledge("stdio inet", NULL((void*)0)) == -1) |
| 1537 | err(1, "pledge"); |
| 1538 | |
| 1539 | if (listen(smtplisten, 10) == -1) |
| 1540 | err(1, "listen"); |
| 1541 | |
| 1542 | if (listen(conflisten, 10) == -1) |
| 1543 | err(1, "listen"); |
| 1544 | |
| 1545 | if (debug != 0) |
| 1546 | printf("listening for incoming connections.\n"); |
| 1547 | syslog_r(LOG_WARNING4, &sdata, "listening for incoming connections."); |
| 1548 | |
| 1549 | /* We always check for trap and sync events if configured. */ |
| 1550 | if (trapfd != -1) { |
| 1551 | pfd[PFD_TRAPFD4].fd = trapfd; |
| 1552 | pfd[PFD_TRAPFD4].events = POLLIN0x0001; |
| 1553 | } else { |
| 1554 | pfd[PFD_TRAPFD4].fd = -1; |
| 1555 | pfd[PFD_TRAPFD4].events = 0; |
| 1556 | } |
| 1557 | if (syncrecv) { |
| 1558 | pfd[PFD_SYNCFD2].fd = syncfd; |
| 1559 | pfd[PFD_SYNCFD2].events = POLLIN0x0001; |
| 1560 | } else { |
| 1561 | pfd[PFD_SYNCFD2].fd = -1; |
| 1562 | pfd[PFD_SYNCFD2].events = 0; |
| 1563 | } |
| 1564 | if (greylist) { |
| 1565 | pfd[PFD_GREYBACK5].fd = greyback[1]; |
| 1566 | pfd[PFD_GREYBACK5].events = POLLIN0x0001; |
| 1567 | } else { |
| 1568 | pfd[PFD_GREYBACK5].fd = -1; |
| 1569 | pfd[PFD_GREYBACK5].events = 0; |
| 1570 | } |
| 1571 | |
| 1572 | /* events and pfd entries for con[] are filled in below. */ |
| 1573 | pfd[PFD_SMTPLISTEN0].fd = smtplisten; |
| 1574 | pfd[PFD_CONFLISTEN1].fd = conflisten; |
| 1575 | |
| 1576 | while (1) { |
| 1577 | int numcon = 0, n, timeout, writers; |
| 1578 | |
| 1579 | time(&t); |
| 1580 | |
| 1581 | writers = 0; |
| 1582 | for (i = 0; i < maxcon; i++) { |
| 1583 | if (con[i].pfd->fd == -1) |
| 1584 | continue; |
| 1585 | con[i].pfd->events = 0; |
| 1586 | if (con[i].r) { |
| 1587 | if (con[i].r + MAXTIME400 <= t) { |
| 1588 | closecon(&con[i]); |
| 1589 | continue; |
| 1590 | } |
| 1591 | con[i].pfd->events |= POLLIN0x0001; |
| 1592 | } |
| 1593 | if (con[i].w) { |
| 1594 | if (con[i].w + MAXTIME400 <= t) { |
| 1595 | closecon(&con[i]); |
| 1596 | continue; |
| 1597 | } |
| 1598 | if (con[i].w <= t) |
| 1599 | con[i].pfd->events |= POLLOUT0x0004; |
| 1600 | writers = 1; |
| 1601 | } |
| 1602 | if (con[i].tlsaction == SPAMD_TLS_ACT_READ_POLLIN1 || |
| 1603 | con[i].tlsaction == SPAMD_TLS_ACT_WRITE_POLLIN3) |
| 1604 | con[i].pfd->events = POLLIN0x0001; |
| 1605 | if (con[i].tlsaction == SPAMD_TLS_ACT_READ_POLLOUT2 || |
| 1606 | con[i].tlsaction == SPAMD_TLS_ACT_WRITE_POLLOUT4) |
| 1607 | con[i].pfd->events = POLLOUT0x0004; |
| 1608 | if (i + 1 > numcon) |
| 1609 | numcon = i + 1; |
| 1610 | } |
| 1611 | pfd[PFD_SMTPLISTEN0].events = 0; |
| 1612 | pfd[PFD_CONFLISTEN1].events = 0; |
| 1613 | pfd[PFD_CONFFD3].events = 0; |
| 1614 | pfd[PFD_CONFFD3].fd = conffd; |
| 1615 | if (slowdowntill == 0) { |
| 1616 | pfd[PFD_SMTPLISTEN0].events = POLLIN0x0001; |
| 1617 | |
| 1618 | /* only one active config conn at a time */ |
| 1619 | if (conffd == -1) |
| 1620 | pfd[PFD_CONFLISTEN1].events = POLLIN0x0001; |
| 1621 | else |
| 1622 | pfd[PFD_CONFFD3].events = POLLIN0x0001; |
| 1623 | } |
| 1624 | |
| 1625 | /* If we are not listening, wake up at least once a second */ |
| 1626 | if (writers == 0 && slowdowntill == 0) |
| 1627 | timeout = INFTIM(-1); |
| 1628 | else |
| 1629 | timeout = 1000; |
| 1630 | |
| 1631 | n = poll(pfd, PFD_FIRSTCON6 + numcon, timeout); |
| 1632 | if (n == -1) { |
| 1633 | if (errno(*__errno()) != EINTR4) |
| 1634 | err(1, "poll"); |
| 1635 | continue; |
| 1636 | } |
| 1637 | |
| 1638 | /* Check if we can speed up accept() calls */ |
| 1639 | if (slowdowntill && slowdowntill > t) |
| 1640 | slowdowntill = 0; |
| 1641 | |
| 1642 | for (i = 0; i < maxcon; i++) { |
| 1643 | if (con[i].pfd->fd == -1) |
| 1644 | continue; |
| 1645 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLHUP0x0010) { |
| 1646 | closecon(&con[i]); |
| 1647 | continue; |
| 1648 | } |
| 1649 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLIN0x0001) { |
| 1650 | if (con[i].tlsaction == |
| 1651 | SPAMD_TLS_ACT_WRITE_POLLIN3) |
| 1652 | handlew(&con[i], clients + 5 < maxcon); |
| 1653 | else |
| 1654 | handler(&con[i]); |
| 1655 | } |
| 1656 | if (pfd[PFD_FIRSTCON6 + i].revents & POLLOUT0x0004) { |
| 1657 | if (con[i].tlsaction == |
| 1658 | SPAMD_TLS_ACT_READ_POLLOUT2) |
| 1659 | handler(&con[i]); |
| 1660 | else |
| 1661 | handlew(&con[i], clients + 5 < maxcon); |
| 1662 | } |
| 1663 | } |
| 1664 | if (pfd[PFD_SMTPLISTEN0].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 1665 | socklen_t sinlen; |
| 1666 | int s2; |
| 1667 | |
| 1668 | sinlen = sizeof(sin); |
| 1669 | s2 = accept4(smtplisten, (struct sockaddr *)&sin, &sinlen, |
| 1670 | SOCK_NONBLOCK0x4000); |
| 1671 | if (s2 == -1) { |
| 1672 | switch (errno(*__errno())) { |
| 1673 | case EINTR4: |
| 1674 | case ECONNABORTED53: |
| 1675 | break; |
| 1676 | case EMFILE24: |
| 1677 | case ENFILE23: |
| 1678 | slowdowntill = time(NULL((void*)0)) + 1; |
| 1679 | break; |
| 1680 | default: |
| 1681 | errx(1, "accept"); |
| 1682 | } |
| 1683 | } else { |
| 1684 | /* Check if we hit the chosen fd limit */ |
| 1685 | for (i = 0; i < maxcon; i++) |
| 1686 | if (con[i].pfd->fd == -1) |
| 1687 | break; |
| 1688 | if (i == maxcon) { |
| 1689 | close(s2); |
| 1690 | slowdowntill = 0; |
| 1691 | } else { |
| 1692 | initcon(&con[i], s2, |
| 1693 | (struct sockaddr *)&sin); |
| 1694 | syslog_r(LOG_INFO6, &sdata, |
| 1695 | "%s: connected (%d/%d)%s%s", |
| 1696 | con[i].addr, clients, blackcount, |
| 1697 | ((con[i].lists == NULL((void*)0)) ? "" : |
| 1698 | ", lists:"), |
| 1699 | ((con[i].lists == NULL((void*)0)) ? "": |
| 1700 | con[i].lists)); |
| 1701 | } |
| 1702 | } |
| 1703 | } |
| 1704 | if (pfd[PFD_CONFLISTEN1].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 1705 | socklen_t sinlen; |
| 1706 | |
| 1707 | sinlen = sizeof(lin); |
| 1708 | conffd = accept(conflisten, (struct sockaddr *)&lin, |
| 1709 | &sinlen); |
| 1710 | if (conffd == -1) { |
| 1711 | switch (errno(*__errno())) { |
| 1712 | case EINTR4: |
| 1713 | case ECONNABORTED53: |
| 1714 | break; |
| 1715 | case EMFILE24: |
| 1716 | case ENFILE23: |
| 1717 | slowdowntill = time(NULL((void*)0)) + 1; |
| 1718 | break; |
| 1719 | default: |
| 1720 | errx(1, "accept"); |
| 1721 | } |
| 1722 | } 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) { |
| 1723 | close(conffd); |
| 1724 | conffd = -1; |
| 1725 | slowdowntill = 0; |
| 1726 | } |
| 1727 | } else if (pfd[PFD_CONFFD3].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1728 | do_config(); |
| 1729 | if (pfd[PFD_TRAPFD4].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1730 | read_configline(trapcfg); |
| 1731 | if (pfd[PFD_SYNCFD2].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1732 | sync_recv(); |
| 1733 | if (pfd[PFD_GREYBACK5].revents & (POLLIN0x0001|POLLHUP0x0010)) |
| 1734 | blackcheck(greyback[1]); |
| 1735 | } |
| 1736 | exit(1); |
| 1737 | } |
| 1738 | |
| 1739 | void |
| 1740 | blackcheck(int fd) |
| 1741 | { |
| 1742 | struct sockaddr_storage ss; |
| 1743 | ssize_t nread; |
| 1744 | void *ia; |
| 1745 | char ch; |
| 1746 | |
| 1747 | /* Read sockaddr from greylister and look it up in the blacklists. */ |
| 1748 | nread = recv(fd, &ss, sizeof(ss), 0); |
| 1749 | if (nread == -1) { |
| 1750 | syslog(LOG_ERR3, "%s: recv: %m", __func__); |
| 1751 | return; |
| 1752 | } |
| 1753 | if (nread != sizeof(struct sockaddr_in) && |
| 1754 | nread != sizeof(struct sockaddr_in6)) { |
| 1755 | syslog(LOG_ERR3, "%s: invalid size %zd", __func__, nread); |
| 1756 | return; |
| 1757 | } |
| 1758 | if (ss.ss_family == AF_INET2) { |
| 1759 | ia = &((struct sockaddr_in *)&ss)->sin_addr; |
| 1760 | } else if (ss.ss_family == AF_INET624) { |
| 1761 | ia = &((struct sockaddr_in6 *)&ss)->sin6_addr; |
| 1762 | } else { |
| 1763 | syslog(LOG_ERR3, "%s: bad family %d", __func__, ss.ss_family); |
| 1764 | return; |
| 1765 | } |
| 1766 | ch = sdl_check(blacklists, ss.ss_family, ia) ? '1' : '0'; |
| 1767 | |
| 1768 | /* Send '1' for match or '0' for no match. */ |
| 1769 | if (send(fd, &ch, sizeof(ch), 0) == -1) { |
| 1770 | syslog(LOG_ERR3, "%s: send: %m", __func__); |
| 1771 | return; |
| 1772 | } |
| 1773 | } |