1 /* $OpenBSD: pfctl_osfp.c,v 1.16 2019/06/28 13:32:51 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/ioctl.h> 21 #include <sys/socket.h> 22 23 #include <netinet/in.h> 24 #include <netinet/ip.h> 25 #include <netinet/ip6.h> 26 #include <net/if.h> 27 #include <net/pfvar.h> 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include "privsep.h" 37 #include "pfctl_parser.h" 38 39 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 40 41 /* #define OSFP_DEBUG 1 */ 42 #ifdef OSFP_DEBUG 43 # define DEBUG(fp, str, v...) \ 44 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 45 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 46 #else 47 # define DEBUG(fp, str, v...) ((void)0) 48 #endif 49 50 51 struct name_entry; 52 LIST_HEAD(name_list, name_entry); 53 struct name_entry { 54 LIST_ENTRY(name_entry) nm_entry; 55 int nm_num; 56 char nm_name[PF_OSFP_LEN]; 57 58 struct name_list nm_sublist; 59 int nm_sublist_num; 60 }; 61 struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 62 int class_count; 63 int fingerprint_count; 64 65 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 66 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 67 void pfctl_flush_my_fingerprints(struct name_list *); 68 char *get_field(u_char **, size_t *, int *); 69 int get_int(u_char **, size_t *, int *, int *, const char *, 70 int, int, const char *, int); 71 int get_str(u_char **, size_t *, char **, const char *, int, 72 const char *, int); 73 int get_tcpopts(const char *, int, const u_char *, 74 pf_tcpopts_t *, int *, int *, int *, int *, int *, 75 int *); 76 void import_fingerprint(struct pf_osfp_ioctl *); 77 #ifdef OSFP_DEBUG 78 const char *print_ioctl(struct pf_osfp_ioctl *); 79 #endif 80 void print_name_list(int, struct name_list *, const char *); 81 void sort_name_list(int, struct name_list *); 82 struct name_entry *lookup_name_list(struct name_list *, const char *); 83 84 /* Load fingerprints from a file */ 85 int 86 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 87 { 88 FILE *in; 89 u_char *line; 90 size_t len; 91 int i, fd, lineno = 0; 92 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 93 wscale_mod, optcnt, ts0; 94 pf_tcpopts_t packed_tcpopts; 95 char *class, *version, *subtype, *desc, *tcpopts; 96 struct pf_osfp_ioctl fp; 97 98 pfctl_flush_my_fingerprints(&classes); 99 100 fd = priv_open_pfosfp(); 101 if (fd < 0) 102 return (1); 103 104 if ((in = fdopen(fd, "r")) == NULL) { 105 warn("%s", fp_filename); 106 return (1); 107 } 108 109 class = version = subtype = desc = tcpopts = NULL; 110 111 if ((opts & PF_OPT_NOACTION) == 0) 112 pfctl_clear_fingerprints(dev, opts); 113 114 while ((line = fgetln(in, &len)) != NULL) { 115 lineno++; 116 free(class); 117 free(version); 118 free(subtype); 119 free(desc); 120 free(tcpopts); 121 class = version = subtype = desc = tcpopts = NULL; 122 memset(&fp, 0, sizeof(fp)); 123 124 /* Chop off comment */ 125 for (i = 0; i < len; i++) 126 if (line[i] == '#') { 127 len = i; 128 break; 129 } 130 /* Chop off whitespace */ 131 while (len > 0 && isspace(line[len - 1])) 132 len--; 133 while (len > 0 && isspace(line[0])) { 134 len--; 135 line++; 136 } 137 if (len == 0) 138 continue; 139 140 #define T_DC 0x01 /* Allow don't care */ 141 #define T_MSS 0x02 /* Allow MSS multiple */ 142 #define T_MTU 0x04 /* Allow MTU multiple */ 143 #define T_MOD 0x08 /* Allow modulus */ 144 145 #define GET_INT(v, mod, n, ty, mx) \ 146 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 147 #define GET_STR(v, n, mn) \ 148 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 149 150 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 151 T_MOD, 0xffff) || 152 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 153 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 154 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 155 8192) || 156 GET_STR(tcpopts, "TCP Options", 1) || 157 GET_STR(class, "OS class", 1) || 158 GET_STR(version, "OS version", 0) || 159 GET_STR(subtype, "OS subtype", 0) || 160 GET_STR(desc, "OS description", 2)) 161 continue; 162 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 163 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 164 continue; 165 if (len != 0) { 166 fprintf(stderr, "%s:%d excess field\n", fp_filename, 167 lineno); 168 continue; 169 } 170 171 fp.fp_ttl = ttl; 172 if (df) 173 fp.fp_flags |= PF_OSFP_DF; 174 switch (w_mod) { 175 case 0: 176 break; 177 case T_DC: 178 fp.fp_flags |= PF_OSFP_WSIZE_DC; 179 break; 180 case T_MSS: 181 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 182 break; 183 case T_MTU: 184 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 185 break; 186 case T_MOD: 187 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 188 break; 189 } 190 fp.fp_wsize = window; 191 192 switch (p_mod) { 193 case T_DC: 194 fp.fp_flags |= PF_OSFP_PSIZE_DC; 195 break; 196 case T_MOD: 197 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 198 } 199 fp.fp_psize = psize; 200 201 202 switch (wscale_mod) { 203 case T_DC: 204 fp.fp_flags |= PF_OSFP_WSCALE_DC; 205 break; 206 case T_MOD: 207 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 208 } 209 fp.fp_wscale = wscale; 210 211 switch (mss_mod) { 212 case T_DC: 213 fp.fp_flags |= PF_OSFP_MSS_DC; 214 break; 215 case T_MOD: 216 fp.fp_flags |= PF_OSFP_MSS_MOD; 217 break; 218 } 219 fp.fp_mss = mss; 220 221 fp.fp_tcpopts = packed_tcpopts; 222 fp.fp_optcnt = optcnt; 223 if (ts0) 224 fp.fp_flags |= PF_OSFP_TS0; 225 226 if (class[0] == '@') 227 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 228 if (class[0] == '*') 229 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 230 231 if (class[0] == '@' || class[0] == '*') 232 strlcpy(fp.fp_os.fp_class_nm, class + 1, 233 sizeof(fp.fp_os.fp_class_nm)); 234 else 235 strlcpy(fp.fp_os.fp_class_nm, class, 236 sizeof(fp.fp_os.fp_class_nm)); 237 strlcpy(fp.fp_os.fp_version_nm, version, 238 sizeof(fp.fp_os.fp_version_nm)); 239 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 240 sizeof(fp.fp_os.fp_subtype_nm)); 241 242 add_fingerprint(dev, opts, &fp); 243 244 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6); 245 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip); 246 add_fingerprint(dev, opts, &fp); 247 } 248 249 free(class); 250 free(version); 251 free(subtype); 252 free(desc); 253 free(tcpopts); 254 255 if (opts & PF_OPT_VERBOSE2) 256 printf("Loaded %d passive OS fingerprints\n", 257 fingerprint_count); 258 fclose(in); 259 return (0); 260 } 261 262 /* flush the kernel's fingerprints */ 263 void 264 pfctl_clear_fingerprints(int dev, int opts) 265 { 266 if (ioctl(dev, DIOCOSFPFLUSH) == -1) 267 err(1, "DIOCOSFPFLUSH"); 268 } 269 270 /* flush pfctl's view of the fingerprints */ 271 void 272 pfctl_flush_my_fingerprints(struct name_list *list) 273 { 274 struct name_entry *nm; 275 276 while ((nm = LIST_FIRST(list)) != NULL) { 277 LIST_REMOVE(nm, nm_entry); 278 pfctl_flush_my_fingerprints(&nm->nm_sublist); 279 free(nm); 280 } 281 fingerprint_count = 0; 282 class_count = 0; 283 } 284 285 /* Fetch the active fingerprints from the kernel */ 286 int 287 pfctl_load_fingerprints(int dev, int opts) 288 { 289 struct pf_osfp_ioctl io; 290 int i; 291 292 pfctl_flush_my_fingerprints(&classes); 293 294 for (i = 0; i >= 0; i++) { 295 memset(&io, 0, sizeof(io)); 296 io.fp_getnum = i; 297 if (ioctl(dev, DIOCOSFPGET, &io) == -1) { 298 if (errno == EBUSY) 299 break; 300 warn("DIOCOSFPGET"); 301 return (1); 302 } 303 import_fingerprint(&io); 304 } 305 return (0); 306 } 307 308 /* List the fingerprints */ 309 void 310 pfctl_show_fingerprints(int opts) 311 { 312 printf("Passive OS Fingerprints:\n"); 313 printf("\tClass\tVersion\tSubtype(subversion)\n"); 314 printf("\t-----\t-------\t-------------------\n"); 315 sort_name_list(opts, &classes); 316 print_name_list(opts, &classes, "\t"); 317 } 318 319 /* Lookup a fingerprint */ 320 pf_osfp_t 321 pfctl_get_fingerprint(const char *name) 322 { 323 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 324 pf_osfp_t ret = PF_OSFP_NOMATCH; 325 int class, version, subtype; 326 int unp_class, unp_version, unp_subtype; 327 int wr_len, version_len, subtype_len; 328 char *ptr, *wr_name; 329 330 if (strcasecmp(name, "unknown") == 0) 331 return (PF_OSFP_UNKNOWN); 332 333 /* Try most likely no version and no subtype */ 334 if ((nm = lookup_name_list(&classes, name))) { 335 class = nm->nm_num; 336 version = PF_OSFP_ANY; 337 subtype = PF_OSFP_ANY; 338 goto found; 339 } else { 340 341 /* Chop it up into class/version/subtype */ 342 343 if ((wr_name = strdup(name)) == NULL) 344 err(1, "malloc"); 345 if ((ptr = strchr(wr_name, ' ')) == NULL) { 346 free(wr_name); 347 return (PF_OSFP_NOMATCH); 348 } 349 *ptr++ = '\0'; 350 351 /* The class is easy to find since it is delimited by a space */ 352 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 353 free(wr_name); 354 return (PF_OSFP_NOMATCH); 355 } 356 class = class_nm->nm_num; 357 358 /* Try no subtype */ 359 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 360 { 361 version = version_nm->nm_num; 362 subtype = PF_OSFP_ANY; 363 free(wr_name); 364 goto found; 365 } 366 367 368 /* 369 * There must be a version and a subtype. 370 * We'll do some fuzzy matching to pick up things like: 371 * Linux 2.2.14 (version=2.2 subtype=14) 372 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 373 * Windows 2000 SP2 (version=2000 subtype=SP2) 374 */ 375 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 376 wr_len = strlen(ptr); 377 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 378 version_len = strlen(version_nm->nm_name); 379 if (wr_len < version_len + 2 || 380 !CONNECTOR(ptr[version_len])) 381 continue; 382 /* first part of the string must be version */ 383 if (strncasecmp(ptr, version_nm->nm_name, 384 version_len)) 385 continue; 386 387 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 388 nm_entry) { 389 subtype_len = strlen(subtype_nm->nm_name); 390 if (wr_len != version_len + subtype_len + 1) 391 continue; 392 393 /* last part of the string must be subtype */ 394 if (strcasecmp(&ptr[version_len+1], 395 subtype_nm->nm_name) != 0) 396 continue; 397 398 /* Found it!! */ 399 version = version_nm->nm_num; 400 subtype = subtype_nm->nm_num; 401 free(wr_name); 402 goto found; 403 } 404 } 405 406 free(wr_name); 407 return (PF_OSFP_NOMATCH); 408 } 409 410 found: 411 PF_OSFP_PACK(ret, class, version, subtype); 412 if (ret != PF_OSFP_NOMATCH) { 413 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 414 if (class != unp_class) { 415 fprintf(stderr, "warning: fingerprint table overflowed " 416 "classes\n"); 417 return (PF_OSFP_NOMATCH); 418 } 419 if (version != unp_version) { 420 fprintf(stderr, "warning: fingerprint table overflowed " 421 "versions\n"); 422 return (PF_OSFP_NOMATCH); 423 } 424 if (subtype != unp_subtype) { 425 fprintf(stderr, "warning: fingerprint table overflowed " 426 "subtypes\n"); 427 return (PF_OSFP_NOMATCH); 428 } 429 } 430 if (ret == PF_OSFP_ANY) { 431 /* should never happen */ 432 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 433 return (PF_OSFP_NOMATCH); 434 } 435 436 return (ret); 437 } 438 439 /* Lookup a fingerprint name by ID */ 440 char * 441 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 442 { 443 int class, version, subtype; 444 struct name_list *list; 445 struct name_entry *nm; 446 447 u_char *class_name, *version_name, *subtype_name; 448 class_name = version_name = subtype_name = NULL; 449 450 if (fp == PF_OSFP_UNKNOWN) { 451 strlcpy(buf, "unknown", len); 452 return (buf); 453 } 454 if (fp == PF_OSFP_ANY) { 455 strlcpy(buf, "any", len); 456 return (buf); 457 } 458 459 PF_OSFP_UNPACK(fp, class, version, subtype); 460 if (class >= (1 << _FP_CLASS_BITS) || 461 version >= (1 << _FP_VERSION_BITS) || 462 subtype >= (1 << _FP_SUBTYPE_BITS)) { 463 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 464 strlcpy(buf, "nomatch", len); 465 return (buf); 466 } 467 468 LIST_FOREACH(nm, &classes, nm_entry) { 469 if (nm->nm_num == class) { 470 class_name = nm->nm_name; 471 if (version == PF_OSFP_ANY) 472 goto found; 473 list = &nm->nm_sublist; 474 LIST_FOREACH(nm, list, nm_entry) { 475 if (nm->nm_num == version) { 476 version_name = nm->nm_name; 477 if (subtype == PF_OSFP_ANY) 478 goto found; 479 list = &nm->nm_sublist; 480 LIST_FOREACH(nm, list, nm_entry) { 481 if (nm->nm_num == subtype) { 482 subtype_name = 483 nm->nm_name; 484 goto found; 485 } 486 } /* foreach subtype */ 487 strlcpy(buf, "nomatch", len); 488 return (buf); 489 } 490 } /* foreach version */ 491 strlcpy(buf, "nomatch", len); 492 return (buf); 493 } 494 } /* foreach class */ 495 496 strlcpy(buf, "nomatch", len); 497 return (buf); 498 499 found: 500 snprintf(buf, len, "%s", class_name); 501 if (version_name) { 502 strlcat(buf, " ", len); 503 strlcat(buf, version_name, len); 504 if (subtype_name) { 505 if (strchr(version_name, ' ')) 506 strlcat(buf, " ", len); 507 else if (strchr(version_name, '.') && 508 isdigit(*subtype_name)) 509 strlcat(buf, ".", len); 510 else 511 strlcat(buf, " ", len); 512 strlcat(buf, subtype_name, len); 513 } 514 } 515 return (buf); 516 } 517 518 /* lookup a name in a list */ 519 struct name_entry * 520 lookup_name_list(struct name_list *list, const char *name) 521 { 522 struct name_entry *nm; 523 LIST_FOREACH(nm, list, nm_entry) 524 if (strcasecmp(name, nm->nm_name) == 0) 525 return (nm); 526 527 return (NULL); 528 } 529 530 531 void 532 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 533 { 534 struct pf_osfp_ioctl fptmp; 535 struct name_entry *nm_class, *nm_version, *nm_subtype; 536 int class, version, subtype; 537 538 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 539 #define EXPAND(field) do { \ 540 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 541 /* pick major version out of #.# */ \ 542 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ 543 _dot = fp->field[_i] - '0'; \ 544 _i += 2; \ 545 } \ 546 if (isdigit(fp->field[_i])) \ 547 _start = fp->field[_i++] - '0'; \ 548 else \ 549 break; \ 550 if (isdigit(fp->field[_i])) \ 551 _start = (_start * 10) + fp->field[_i++] - '0'; \ 552 if (fp->field[_i++] != '-') \ 553 break; \ 554 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ 555 fp->field[_i] - '0' == _dot) \ 556 _i += 2; \ 557 else if (_dot != -1) \ 558 break; \ 559 if (isdigit(fp->field[_i])) \ 560 _end = fp->field[_i++] - '0'; \ 561 else \ 562 break; \ 563 if (isdigit(fp->field[_i])) \ 564 _end = (_end * 10) + fp->field[_i++] - '0'; \ 565 if (isdigit(fp->field[_i])) \ 566 _end = (_end * 10) + fp->field[_i++] - '0'; \ 567 if (fp->field[_i] != '\0') \ 568 break; \ 569 memcpy(&fptmp, fp, sizeof(fptmp)); \ 570 for (;_start <= _end; _start++) { \ 571 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 572 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 573 if (_dot == -1) \ 574 snprintf(fptmp.field, sizeof(fptmp.field), \ 575 "%d", _start); \ 576 else \ 577 snprintf(fptmp.field, sizeof(fptmp.field), \ 578 "%d.%d", _dot, _start); \ 579 add_fingerprint(dev, opts, &fptmp); \ 580 } \ 581 } while(0) 582 583 /* We allow "#-#" as a version or subtype and we'll expand it */ 584 EXPAND(fp_os.fp_version_nm); 585 EXPAND(fp_os.fp_subtype_nm); 586 587 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 588 errx(1, "fingerprint class \"nomatch\" is reserved"); 589 590 version = PF_OSFP_ANY; 591 subtype = PF_OSFP_ANY; 592 593 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 594 if (nm_class->nm_num == 0) 595 nm_class->nm_num = ++class_count; 596 class = nm_class->nm_num; 597 598 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 599 fp->fp_os.fp_version_nm); 600 if (nm_version) { 601 if (nm_version->nm_num == 0) 602 nm_version->nm_num = ++nm_class->nm_sublist_num; 603 version = nm_version->nm_num; 604 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 605 fp->fp_os.fp_subtype_nm); 606 if (nm_subtype) { 607 if (nm_subtype->nm_num == 0) 608 nm_subtype->nm_num = 609 ++nm_version->nm_sublist_num; 610 subtype = nm_subtype->nm_num; 611 } 612 } 613 614 615 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 616 print_ioctl(fp)); 617 618 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 619 fingerprint_count++; 620 621 #ifdef FAKE_PF_KERNEL 622 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 623 if ((errno = pf_osfp_add(fp))) 624 #else 625 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp) == -1) 626 #endif /* FAKE_PF_KERNEL */ 627 { 628 if (errno == EEXIST) { 629 warn("Duplicate signature for %s %s %s", 630 fp->fp_os.fp_class_nm, 631 fp->fp_os.fp_version_nm, 632 fp->fp_os.fp_subtype_nm); 633 634 } else { 635 err(1, "DIOCOSFPADD"); 636 } 637 } 638 } 639 640 /* import a fingerprint from the kernel */ 641 void 642 import_fingerprint(struct pf_osfp_ioctl *fp) 643 { 644 struct name_entry *nm_class, *nm_version, *nm_subtype; 645 int class, version, subtype; 646 647 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 648 649 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 650 if (nm_class->nm_num == 0) { 651 nm_class->nm_num = class; 652 class_count = MAXIMUM(class_count, class); 653 } 654 655 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 656 fp->fp_os.fp_version_nm); 657 if (nm_version) { 658 if (nm_version->nm_num == 0) { 659 nm_version->nm_num = version; 660 nm_class->nm_sublist_num = MAXIMUM(nm_class->nm_sublist_num, 661 version); 662 } 663 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 664 fp->fp_os.fp_subtype_nm); 665 if (nm_subtype) { 666 if (nm_subtype->nm_num == 0) { 667 nm_subtype->nm_num = subtype; 668 nm_version->nm_sublist_num = 669 MAXIMUM(nm_version->nm_sublist_num, subtype); 670 } 671 } 672 } 673 674 675 fingerprint_count++; 676 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 677 } 678 679 /* Find an entry for a fingerprints class/version/subtype */ 680 struct name_entry * 681 fingerprint_name_entry(struct name_list *list, char *name) 682 { 683 struct name_entry *nm_entry; 684 685 if (name == NULL || strlen(name) == 0) 686 return (NULL); 687 688 LIST_FOREACH(nm_entry, list, nm_entry) { 689 if (strcasecmp(nm_entry->nm_name, name) == 0) { 690 /* We'll move this to the front of the list later */ 691 LIST_REMOVE(nm_entry, nm_entry); 692 break; 693 } 694 } 695 if (nm_entry == NULL) { 696 nm_entry = calloc(1, sizeof(*nm_entry)); 697 if (nm_entry == NULL) 698 err(1, "calloc"); 699 LIST_INIT(&nm_entry->nm_sublist); 700 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 701 } 702 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 703 return (nm_entry); 704 } 705 706 707 void 708 print_name_list(int opts, struct name_list *nml, const char *prefix) 709 { 710 char newprefix[32]; 711 struct name_entry *nm; 712 713 LIST_FOREACH(nm, nml, nm_entry) { 714 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 715 nm->nm_name); 716 printf("%s\n", newprefix); 717 print_name_list(opts, &nm->nm_sublist, newprefix); 718 } 719 } 720 721 void 722 sort_name_list(int opts, struct name_list *nml) 723 { 724 struct name_list new; 725 struct name_entry *nm, *nmsearch, *nmlast; 726 727 /* yes yes, it's a very slow sort. so sue me */ 728 729 LIST_INIT(&new); 730 731 while ((nm = LIST_FIRST(nml)) != NULL) { 732 LIST_REMOVE(nm, nm_entry); 733 nmlast = NULL; 734 LIST_FOREACH(nmsearch, &new, nm_entry) { 735 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 736 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 737 break; 738 } 739 nmlast = nmsearch; 740 } 741 if (nmsearch == NULL) { 742 if (nmlast) 743 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 744 else 745 LIST_INSERT_HEAD(&new, nm, nm_entry); 746 } 747 748 sort_name_list(opts, &nm->nm_sublist); 749 } 750 nmlast = NULL; 751 while ((nm = LIST_FIRST(&new)) != NULL) { 752 LIST_REMOVE(nm, nm_entry); 753 if (nmlast == NULL) 754 LIST_INSERT_HEAD(nml, nm, nm_entry); 755 else 756 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 757 nmlast = nm; 758 } 759 } 760 761 /* parse the next integer in a formatted config file line */ 762 int 763 get_int(u_char **line, size_t *len, int *var, int *mod, 764 const char *name, int flags, int max, const char *filename, int lineno) 765 { 766 int fieldlen, i; 767 u_char *field; 768 long val = 0; 769 770 if (mod) 771 *mod = 0; 772 *var = 0; 773 774 field = get_field(line, len, &fieldlen); 775 if (field == NULL) 776 return (1); 777 if (fieldlen == 0) { 778 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 779 return (1); 780 } 781 782 i = 0; 783 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 784 && fieldlen >= 1) { 785 switch (*field) { 786 case 'S': 787 if (mod && (flags & T_MSS)) 788 *mod = T_MSS; 789 if (fieldlen == 1) 790 return (0); 791 break; 792 case 'T': 793 if (mod && (flags & T_MTU)) 794 *mod = T_MTU; 795 if (fieldlen == 1) 796 return (0); 797 break; 798 case '*': 799 if (fieldlen != 1) { 800 fprintf(stderr, "%s:%d long '%c' %s\n", 801 filename, lineno, *field, name); 802 return (1); 803 } 804 if (mod && (flags & T_DC)) { 805 *mod = T_DC; 806 return (0); 807 } 808 case '%': 809 if (mod && (flags & T_MOD)) 810 *mod = T_MOD; 811 if (fieldlen == 1) { 812 fprintf(stderr, "%s:%d modulus %s must have a " 813 "value\n", filename, lineno, name); 814 return (1); 815 } 816 break; 817 } 818 if (mod == NULL || *mod == 0) { 819 fprintf(stderr, "%s:%d does not allow %c' %s\n", 820 filename, lineno, *field, name); 821 return (1); 822 } 823 i++; 824 } 825 826 for (; i < fieldlen; i++) { 827 if (field[i] < '0' || field[i] > '9') { 828 fprintf(stderr, "%s:%d non-digit character in %s\n", 829 filename, lineno, name); 830 return (1); 831 } 832 val = val * 10 + field[i] - '0'; 833 if (val < 0) { 834 fprintf(stderr, "%s:%d %s overflowed\n", filename, 835 lineno, name); 836 return (1); 837 } 838 } 839 840 if (val > max) { 841 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 842 name, val, max); 843 return (1); 844 } 845 *var = (int)val; 846 847 return (0); 848 } 849 850 /* parse the next string in a formatted config file line */ 851 int 852 get_str(u_char **line, size_t *len, char **v, const char *name, int minlen, 853 const char *filename, int lineno) 854 { 855 int fieldlen; 856 char *ptr; 857 858 ptr = get_field(line, len, &fieldlen); 859 if (ptr == NULL) 860 return (1); 861 if (fieldlen < minlen) { 862 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 863 return (1); 864 } 865 if ((*v = malloc(fieldlen + 1)) == NULL) { 866 perror("malloc()"); 867 return (1); 868 } 869 memcpy(*v, ptr, fieldlen); 870 (*v)[fieldlen] = '\0'; 871 872 return (0); 873 } 874 875 /* Parse out the TCP opts */ 876 int 877 get_tcpopts(const char *filename, int lineno, const u_char *tcpopts, 878 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 879 int *wscale_mod, int *ts0) 880 { 881 int i, opt; 882 883 *packed = 0; 884 *optcnt = 0; 885 *wscale = 0; 886 *wscale_mod = T_DC; 887 *mss = 0; 888 *mss_mod = T_DC; 889 *ts0 = 0; 890 if (strcmp(tcpopts, ".") == 0) 891 return (0); 892 893 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 894 switch ((opt = toupper(tcpopts[i++]))) { 895 case 'N': /* FALLTHROUGH */ 896 case 'S': 897 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 898 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 899 PF_OSFP_TCPOPT_SACK); 900 break; 901 case 'W': /* FALLTHROUGH */ 902 case 'M': { 903 int *this_mod, *this; 904 905 if (opt == 'W') { 906 this = wscale; 907 this_mod = wscale_mod; 908 } else { 909 this = mss; 910 this_mod = mss_mod; 911 } 912 *this = 0; 913 *this_mod = 0; 914 915 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 916 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 917 PF_OSFP_TCPOPT_MSS); 918 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 919 tcpopts[i + 1] == ',')) { 920 *this_mod = T_DC; 921 i++; 922 break; 923 } 924 925 if (tcpopts[i] == '%') { 926 *this_mod = T_MOD; 927 i++; 928 } 929 do { 930 if (!isdigit(tcpopts[i])) { 931 fprintf(stderr, "%s:%d unknown " 932 "character '%c' in %c TCP opt\n", 933 filename, lineno, tcpopts[i], opt); 934 return (1); 935 } 936 *this = (*this * 10) + tcpopts[i++] - '0'; 937 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 938 break; 939 } 940 case 'T': 941 if (tcpopts[i] == '0') { 942 *ts0 = 1; 943 i++; 944 } 945 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 946 PF_OSFP_TCPOPT_TS; 947 break; 948 } 949 (*optcnt) ++; 950 if (tcpopts[i] == '\0') 951 break; 952 if (tcpopts[i] != ',') { 953 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 954 filename, lineno, opt); 955 return (1); 956 } 957 i++; 958 } 959 960 return (0); 961 } 962 963 /* rip the next field out of a formatted config file line */ 964 char * 965 get_field(u_char **line, size_t *len, int *fieldlen) 966 { 967 char *ret, *ptr = *line; 968 size_t plen = *len; 969 970 971 while (plen && isspace((unsigned char)*ptr)) { 972 plen--; 973 ptr++; 974 } 975 ret = ptr; 976 *fieldlen = 0; 977 978 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 979 (*fieldlen)++; 980 if (plen) { 981 *line = ptr + 1; 982 *len = plen - 1; 983 } else { 984 *len = 0; 985 } 986 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1])) 987 (*fieldlen)--; 988 return (ret); 989 } 990 991 992 #ifdef OSFP_DEBUG 993 const char * 994 print_ioctl(struct pf_osfp_ioctl *fp) 995 { 996 static char buf[1024]; 997 char tmp[32]; 998 int i, opt; 999 1000 *buf = '\0'; 1001 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1002 strlcat(buf, "*", sizeof(buf)); 1003 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1004 strlcat(buf, "S", sizeof(buf)); 1005 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1006 strlcat(buf, "T", sizeof(buf)); 1007 else { 1008 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1009 strlcat(buf, "%", sizeof(buf)); 1010 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1011 strlcat(buf, tmp, sizeof(buf)); 1012 } 1013 strlcat(buf, ":", sizeof(buf)); 1014 1015 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1016 strlcat(buf, tmp, sizeof(buf)); 1017 strlcat(buf, ":", sizeof(buf)); 1018 1019 if (fp->fp_flags & PF_OSFP_DF) 1020 strlcat(buf, "1", sizeof(buf)); 1021 else 1022 strlcat(buf, "0", sizeof(buf)); 1023 strlcat(buf, ":", sizeof(buf)); 1024 1025 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1026 strlcat(buf, "*", sizeof(buf)); 1027 else { 1028 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1029 strlcat(buf, "%", sizeof(buf)); 1030 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1031 strlcat(buf, tmp, sizeof(buf)); 1032 } 1033 strlcat(buf, ":", sizeof(buf)); 1034 1035 if (fp->fp_optcnt == 0) 1036 strlcat(buf, ".", sizeof(buf)); 1037 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1038 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1039 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1040 switch (opt) { 1041 case PF_OSFP_TCPOPT_NOP: 1042 strlcat(buf, "N", sizeof(buf)); 1043 break; 1044 case PF_OSFP_TCPOPT_SACK: 1045 strlcat(buf, "S", sizeof(buf)); 1046 break; 1047 case PF_OSFP_TCPOPT_TS: 1048 strlcat(buf, "T", sizeof(buf)); 1049 if (fp->fp_flags & PF_OSFP_TS0) 1050 strlcat(buf, "0", sizeof(buf)); 1051 break; 1052 case PF_OSFP_TCPOPT_MSS: 1053 strlcat(buf, "M", sizeof(buf)); 1054 if (fp->fp_flags & PF_OSFP_MSS_DC) 1055 strlcat(buf, "*", sizeof(buf)); 1056 else { 1057 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1058 strlcat(buf, "%", sizeof(buf)); 1059 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1060 strlcat(buf, tmp, sizeof(buf)); 1061 } 1062 break; 1063 case PF_OSFP_TCPOPT_WSCALE: 1064 strlcat(buf, "W", sizeof(buf)); 1065 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1066 strlcat(buf, "*", sizeof(buf)); 1067 else { 1068 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1069 strlcat(buf, "%", sizeof(buf)); 1070 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1071 strlcat(buf, tmp, sizeof(buf)); 1072 } 1073 break; 1074 } 1075 1076 if (i != 0) 1077 strlcat(buf, ",", sizeof(buf)); 1078 } 1079 strlcat(buf, ":", sizeof(buf)); 1080 1081 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1082 strlcat(buf, ":", sizeof(buf)); 1083 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1084 strlcat(buf, ":", sizeof(buf)); 1085 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1086 strlcat(buf, ":", sizeof(buf)); 1087 1088 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1089 (long long int)fp->fp_tcpopts); 1090 strlcat(buf, tmp, sizeof(buf)); 1091 1092 return (buf); 1093 } 1094 #endif 1095