1 /* $OpenBSD: pfctl_osfp.c,v 1.9 2014/08/14 12:44:44 mpi 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 <net/if.h> 24 #include <net/pfvar.h> 25 26 #include <ctype.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 33 #include <netinet/ip.h> 34 #include <netinet/ip6.h> 35 36 #include "privsep.h" 37 #include "pfctl_parser.h" 38 39 #ifndef MIN 40 # define MIN(a,b) (((a) < (b)) ? (a) : (b)) 41 #endif /* MIN */ 42 #ifndef MAX 43 # define MAX(a,b) (((a) > (b)) ? (a) : (b)) 44 #endif /* MAX */ 45 46 47 #if 0 48 # define DEBUG(fp, str, v...) \ 49 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 50 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 51 #else 52 # define DEBUG(fp, str, v...) ((void)0) 53 #endif 54 55 56 struct name_entry; 57 LIST_HEAD(name_list, name_entry); 58 struct name_entry { 59 LIST_ENTRY(name_entry) nm_entry; 60 int nm_num; 61 char nm_name[PF_OSFP_LEN]; 62 63 struct name_list nm_sublist; 64 int nm_sublist_num; 65 }; 66 struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 67 int class_count; 68 int fingerprint_count; 69 70 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 71 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 72 void pfctl_flush_my_fingerprints(struct name_list *); 73 char *get_field(u_char **, size_t *, int *); 74 int get_int(u_char **, size_t *, int *, int *, const char *, 75 int, int, const char *, int); 76 int get_str(u_char **, size_t *, char **, const char *, int, 77 const char *, int); 78 int get_tcpopts(const char *, int, const u_char *, 79 pf_tcpopts_t *, int *, int *, int *, int *, int *, 80 int *); 81 void import_fingerprint(struct pf_osfp_ioctl *); 82 const char *print_ioctl(struct pf_osfp_ioctl *); 83 void print_name_list(int, struct name_list *, const char *); 84 void sort_name_list(int, struct name_list *); 85 struct name_entry *lookup_name_list(struct name_list *, const char *); 86 87 /* XXX arbitrary */ 88 #define MAX_FP_LINE 1024 89 90 /* Load fingerprints from a file */ 91 int 92 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 93 { 94 u_char buf[MAX_FP_LINE]; 95 u_char *line; 96 size_t len; 97 int i, lineno = 0; 98 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 99 wscale_mod, optcnt, ts0; 100 pf_tcpopts_t packed_tcpopts; 101 char *class, *version, *subtype, *desc, *tcpopts; 102 struct pf_osfp_ioctl fp; 103 104 pfctl_flush_my_fingerprints(&classes); 105 class = version = subtype = desc = tcpopts = NULL; 106 107 if ((opts & PF_OPT_NOACTION) == 0) 108 pfctl_clear_fingerprints(dev, opts); 109 110 priv_getlines(FTAB_PFOSFP); 111 while ((len = priv_getline(buf, sizeof(buf))) > 0) { 112 buf[len -1] = '\n'; 113 line = buf; 114 lineno++; 115 if (class) 116 free(class); 117 if (version) 118 free(version); 119 if (subtype) 120 free(subtype); 121 if (desc) 122 free(desc); 123 if (tcpopts) 124 free(tcpopts); 125 class = version = subtype = desc = tcpopts = NULL; 126 memset(&fp, 0, sizeof(fp)); 127 128 /* Chop off comment */ 129 for (i = 0; i < len; i++) 130 if (line[i] == '#') { 131 len = i; 132 break; 133 } 134 /* Chop off whitespace */ 135 while (len > 0 && isspace(line[len - 1])) 136 len--; 137 while (len > 0 && isspace(line[0])) { 138 len--; 139 line++; 140 } 141 if (len == 0) 142 continue; 143 144 #define T_DC 0x01 /* Allow don't care */ 145 #define T_MSS 0x02 /* Allow MSS multiple */ 146 #define T_MTU 0x04 /* Allow MTU multiple */ 147 #define T_MOD 0x08 /* Allow modulus */ 148 149 #define GET_INT(v, mod, n, ty, mx) \ 150 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 151 #define GET_STR(v, n, mn) \ 152 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 153 154 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 155 T_MOD, 0xffff) || 156 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 157 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 158 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 159 8192) || 160 GET_STR(tcpopts, "TCP Options", 1) || 161 GET_STR(class, "OS class", 1) || 162 GET_STR(version, "OS version", 0) || 163 GET_STR(subtype, "OS subtype", 0) || 164 GET_STR(desc, "OS description", 2)) 165 continue; 166 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 167 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 168 continue; 169 if (len != 0) { 170 fprintf(stderr, "%s:%d excess field\n", fp_filename, 171 lineno); 172 continue; 173 } 174 175 fp.fp_ttl = ttl; 176 if (df) 177 fp.fp_flags |= PF_OSFP_DF; 178 switch (w_mod) { 179 case 0: 180 break; 181 case T_DC: 182 fp.fp_flags |= PF_OSFP_WSIZE_DC; 183 break; 184 case T_MSS: 185 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 186 break; 187 case T_MTU: 188 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 189 break; 190 case T_MOD: 191 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 192 break; 193 } 194 fp.fp_wsize = window; 195 196 switch (p_mod) { 197 case T_DC: 198 fp.fp_flags |= PF_OSFP_PSIZE_DC; 199 break; 200 case T_MOD: 201 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 202 } 203 fp.fp_psize = psize; 204 205 206 switch (wscale_mod) { 207 case T_DC: 208 fp.fp_flags |= PF_OSFP_WSCALE_DC; 209 break; 210 case T_MOD: 211 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 212 } 213 fp.fp_wscale = wscale; 214 215 switch (mss_mod) { 216 case T_DC: 217 fp.fp_flags |= PF_OSFP_MSS_DC; 218 break; 219 case T_MOD: 220 fp.fp_flags |= PF_OSFP_MSS_MOD; 221 break; 222 } 223 fp.fp_mss = mss; 224 225 fp.fp_tcpopts = packed_tcpopts; 226 fp.fp_optcnt = optcnt; 227 if (ts0) 228 fp.fp_flags |= PF_OSFP_TS0; 229 230 if (class[0] == '@') 231 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 232 if (class[0] == '*') 233 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 234 235 if (class[0] == '@' || class[0] == '*') 236 strlcpy(fp.fp_os.fp_class_nm, class + 1, 237 sizeof(fp.fp_os.fp_class_nm)); 238 else 239 strlcpy(fp.fp_os.fp_class_nm, class, 240 sizeof(fp.fp_os.fp_class_nm)); 241 strlcpy(fp.fp_os.fp_version_nm, version, 242 sizeof(fp.fp_os.fp_version_nm)); 243 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 244 sizeof(fp.fp_os.fp_subtype_nm)); 245 246 add_fingerprint(dev, opts, &fp); 247 248 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6); 249 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip); 250 add_fingerprint(dev, opts, &fp); 251 } 252 253 if (class) 254 free(class); 255 if (version) 256 free(version); 257 if (subtype) 258 free(subtype); 259 if (desc) 260 free(desc); 261 262 if (opts & PF_OPT_VERBOSE2) 263 printf("Loaded %d passive OS fingerprints\n", 264 fingerprint_count); 265 return (0); 266 } 267 268 /* flush the kernel's fingerprints */ 269 void 270 pfctl_clear_fingerprints(int dev, int opts) 271 { 272 if (ioctl(dev, DIOCOSFPFLUSH)) 273 err(1, "DIOCOSFPFLUSH"); 274 } 275 276 /* flush pfctl's view of the fingerprints */ 277 void 278 pfctl_flush_my_fingerprints(struct name_list *list) 279 { 280 struct name_entry *nm; 281 282 while ((nm = LIST_FIRST(list)) != NULL) { 283 LIST_REMOVE(nm, nm_entry); 284 pfctl_flush_my_fingerprints(&nm->nm_sublist); 285 fingerprint_count--; 286 free(nm); 287 } 288 class_count = 0; 289 } 290 291 /* Fetch the active fingerprints from the kernel */ 292 int 293 pfctl_load_fingerprints(int dev, int opts) 294 { 295 struct pf_osfp_ioctl io; 296 int i; 297 298 pfctl_flush_my_fingerprints(&classes); 299 300 for (i = 0; i >= 0; i++) { 301 memset(&io, 0, sizeof(io)); 302 io.fp_getnum = i; 303 if (ioctl(dev, DIOCOSFPGET, &io)) { 304 if (errno == EBUSY) 305 break; 306 warn("DIOCOSFPGET"); 307 return (1); 308 } 309 import_fingerprint(&io); 310 } 311 return (0); 312 } 313 314 /* List the fingerprints */ 315 void 316 pfctl_show_fingerprints(int opts) 317 { 318 printf("Passive OS Fingerprints:\n"); 319 printf("\tClass\tVersion\tSubtype(subversion)\n"); 320 printf("\t-----\t-------\t-------------------\n"); 321 sort_name_list(opts, &classes); 322 print_name_list(opts, &classes, "\t"); 323 } 324 325 /* Lookup a fingerprint */ 326 pf_osfp_t 327 pfctl_get_fingerprint(const char *name) 328 { 329 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 330 pf_osfp_t ret = PF_OSFP_NOMATCH; 331 int class, version, subtype; 332 int unp_class, unp_version, unp_subtype; 333 int wr_len, version_len, subtype_len; 334 char *ptr, *wr_name; 335 336 if (strcasecmp(name, "unknown") == 0) 337 return (PF_OSFP_UNKNOWN); 338 339 /* Try most likely no version and no subtype */ 340 if ((nm = lookup_name_list(&classes, name))) { 341 class = nm->nm_num; 342 version = PF_OSFP_ANY; 343 subtype = PF_OSFP_ANY; 344 goto found; 345 } else { 346 347 /* Chop it up into class/version/subtype */ 348 349 if ((wr_name = strdup(name)) == NULL) 350 err(1, "malloc"); 351 if ((ptr = strchr(wr_name, ' ')) == NULL) { 352 free(wr_name); 353 return (PF_OSFP_NOMATCH); 354 } 355 *ptr++ = '\0'; 356 357 /* The class is easy to find since it is delimited by a space */ 358 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 359 free(wr_name); 360 return (PF_OSFP_NOMATCH); 361 } 362 class = class_nm->nm_num; 363 364 /* Try no subtype */ 365 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 366 { 367 version = version_nm->nm_num; 368 subtype = PF_OSFP_ANY; 369 free(wr_name); 370 goto found; 371 } 372 373 374 /* 375 * There must be a version and a subtype. 376 * We'll do some fuzzy matching to pick up things like: 377 * Linux 2.2.14 (version=2.2 subtype=14) 378 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 379 * Windows 2000 SP2 (version=2000 subtype=SP2) 380 */ 381 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 382 wr_len = strlen(ptr); 383 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 384 version_len = strlen(version_nm->nm_name); 385 if (wr_len < version_len + 2 || 386 !CONNECTOR(ptr[version_len])) 387 continue; 388 /* first part of the string must be version */ 389 if (strncasecmp(ptr, version_nm->nm_name, 390 version_len)) 391 continue; 392 393 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 394 nm_entry) { 395 subtype_len = strlen(subtype_nm->nm_name); 396 if (wr_len != version_len + subtype_len + 1) 397 continue; 398 399 /* last part of the string must be subtype */ 400 if (strcasecmp(&ptr[version_len+1], 401 subtype_nm->nm_name) != 0) 402 continue; 403 404 /* Found it!! */ 405 version = version_nm->nm_num; 406 subtype = subtype_nm->nm_num; 407 free(wr_name); 408 goto found; 409 } 410 } 411 412 free(wr_name); 413 return (PF_OSFP_NOMATCH); 414 } 415 416 found: 417 PF_OSFP_PACK(ret, class, version, subtype); 418 if (ret != PF_OSFP_NOMATCH) { 419 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 420 if (class != unp_class) { 421 fprintf(stderr, "warning: fingerprint table overflowed " 422 "classes\n"); 423 return (PF_OSFP_NOMATCH); 424 } 425 if (version != unp_version) { 426 fprintf(stderr, "warning: fingerprint table overflowed " 427 "versions\n"); 428 return (PF_OSFP_NOMATCH); 429 } 430 if (subtype != unp_subtype) { 431 fprintf(stderr, "warning: fingerprint table overflowed " 432 "subtypes\n"); 433 return (PF_OSFP_NOMATCH); 434 } 435 } 436 if (ret == PF_OSFP_ANY) { 437 /* should never happen */ 438 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 439 return (PF_OSFP_NOMATCH); 440 } 441 442 return (ret); 443 } 444 445 /* Lookup a fingerprint name by ID */ 446 char * 447 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 448 { 449 int class, version, subtype; 450 struct name_list *list; 451 struct name_entry *nm; 452 453 u_char *class_name, *version_name, *subtype_name; 454 class_name = version_name = subtype_name = NULL; 455 456 if (fp == PF_OSFP_UNKNOWN) { 457 strlcpy(buf, "unknown", len); 458 return (buf); 459 } 460 if (fp == PF_OSFP_ANY) { 461 strlcpy(buf, "any", len); 462 return (buf); 463 } 464 465 PF_OSFP_UNPACK(fp, class, version, subtype); 466 if (class >= (1 << _FP_CLASS_BITS) || 467 version >= (1 << _FP_VERSION_BITS) || 468 subtype >= (1 << _FP_SUBTYPE_BITS)) { 469 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 470 strlcpy(buf, "nomatch", len); 471 return (buf); 472 } 473 474 LIST_FOREACH(nm, &classes, nm_entry) { 475 if (nm->nm_num == class) { 476 class_name = nm->nm_name; 477 if (version == PF_OSFP_ANY) 478 goto found; 479 list = &nm->nm_sublist; 480 LIST_FOREACH(nm, list, nm_entry) { 481 if (nm->nm_num == version) { 482 version_name = nm->nm_name; 483 if (subtype == PF_OSFP_ANY) 484 goto found; 485 list = &nm->nm_sublist; 486 LIST_FOREACH(nm, list, nm_entry) { 487 if (nm->nm_num == subtype) { 488 subtype_name = 489 nm->nm_name; 490 goto found; 491 } 492 } /* foreach subtype */ 493 strlcpy(buf, "nomatch", len); 494 return (buf); 495 } 496 } /* foreach version */ 497 strlcpy(buf, "nomatch", len); 498 return (buf); 499 } 500 } /* foreach class */ 501 502 strlcpy(buf, "nomatch", len); 503 return (buf); 504 505 found: 506 snprintf(buf, len, "%s", class_name); 507 if (version_name) { 508 strlcat(buf, " ", len); 509 strlcat(buf, version_name, len); 510 if (subtype_name) { 511 if (strchr(version_name, ' ')) 512 strlcat(buf, " ", len); 513 else if (strchr(version_name, '.') && 514 isdigit(*subtype_name)) 515 strlcat(buf, ".", len); 516 else 517 strlcat(buf, " ", len); 518 strlcat(buf, subtype_name, len); 519 } 520 } 521 return (buf); 522 } 523 524 /* lookup a name in a list */ 525 struct name_entry * 526 lookup_name_list(struct name_list *list, const char *name) 527 { 528 struct name_entry *nm; 529 LIST_FOREACH(nm, list, nm_entry) 530 if (strcasecmp(name, nm->nm_name) == 0) 531 return (nm); 532 533 return (NULL); 534 } 535 536 537 void 538 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 539 { 540 struct pf_osfp_ioctl fptmp; 541 struct name_entry *nm_class, *nm_version, *nm_subtype; 542 int class, version, subtype; 543 544 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 545 #define EXPAND(field) do { \ 546 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 547 /* pick major version out of #.# */ \ 548 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ 549 _dot = fp->field[_i] - '0'; \ 550 _i += 2; \ 551 } \ 552 if (isdigit(fp->field[_i])) \ 553 _start = fp->field[_i++] - '0'; \ 554 else \ 555 break; \ 556 if (isdigit(fp->field[_i])) \ 557 _start = (_start * 10) + fp->field[_i++] - '0'; \ 558 if (fp->field[_i++] != '-') \ 559 break; \ 560 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ 561 fp->field[_i] - '0' == _dot) \ 562 _i += 2; \ 563 else if (_dot != -1) \ 564 break; \ 565 if (isdigit(fp->field[_i])) \ 566 _end = fp->field[_i++] - '0'; \ 567 else \ 568 break; \ 569 if (isdigit(fp->field[_i])) \ 570 _end = (_end * 10) + fp->field[_i++] - '0'; \ 571 if (isdigit(fp->field[_i])) \ 572 _end = (_end * 10) + fp->field[_i++] - '0'; \ 573 if (fp->field[_i] != '\0') \ 574 break; \ 575 memcpy(&fptmp, fp, sizeof(fptmp)); \ 576 for (;_start <= _end; _start++) { \ 577 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 578 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 579 if (_dot == -1) \ 580 snprintf(fptmp.field, sizeof(fptmp.field), \ 581 "%d", _start); \ 582 else \ 583 snprintf(fptmp.field, sizeof(fptmp.field), \ 584 "%d.%d", _dot, _start); \ 585 add_fingerprint(dev, opts, &fptmp); \ 586 } \ 587 } while(0) 588 589 /* We allow "#-#" as a version or subtype and we'll expand it */ 590 EXPAND(fp_os.fp_version_nm); 591 EXPAND(fp_os.fp_subtype_nm); 592 593 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 594 errx(1, "fingerprint class \"nomatch\" is reserved"); 595 596 version = PF_OSFP_ANY; 597 subtype = PF_OSFP_ANY; 598 599 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 600 if (nm_class->nm_num == 0) 601 nm_class->nm_num = ++class_count; 602 class = nm_class->nm_num; 603 604 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 605 fp->fp_os.fp_version_nm); 606 if (nm_version) { 607 if (nm_version->nm_num == 0) 608 nm_version->nm_num = ++nm_class->nm_sublist_num; 609 version = nm_version->nm_num; 610 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 611 fp->fp_os.fp_subtype_nm); 612 if (nm_subtype) { 613 if (nm_subtype->nm_num == 0) 614 nm_subtype->nm_num = 615 ++nm_version->nm_sublist_num; 616 subtype = nm_subtype->nm_num; 617 } 618 } 619 620 621 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 622 print_ioctl(fp)); 623 624 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 625 fingerprint_count++; 626 627 #ifdef FAKE_PF_KERNEL 628 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 629 if ((errno = pf_osfp_add(fp))) 630 #else 631 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) 632 #endif /* FAKE_PF_KERNEL */ 633 { 634 if (errno == EEXIST) { 635 warn("Duplicate signature for %s %s %s", 636 fp->fp_os.fp_class_nm, 637 fp->fp_os.fp_version_nm, 638 fp->fp_os.fp_subtype_nm); 639 640 } else { 641 err(1, "DIOCOSFPADD"); 642 } 643 } 644 } 645 646 /* import a fingerprint from the kernel */ 647 void 648 import_fingerprint(struct pf_osfp_ioctl *fp) 649 { 650 struct name_entry *nm_class, *nm_version, *nm_subtype; 651 int class, version, subtype; 652 653 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 654 655 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 656 if (nm_class->nm_num == 0) { 657 nm_class->nm_num = class; 658 class_count = MAX(class_count, class); 659 } 660 661 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 662 fp->fp_os.fp_version_nm); 663 if (nm_version) { 664 if (nm_version->nm_num == 0) { 665 nm_version->nm_num = version; 666 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, 667 version); 668 } 669 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 670 fp->fp_os.fp_subtype_nm); 671 if (nm_subtype) { 672 if (nm_subtype->nm_num == 0) { 673 nm_subtype->nm_num = subtype; 674 nm_version->nm_sublist_num = 675 MAX(nm_version->nm_sublist_num, subtype); 676 } 677 } 678 } 679 680 681 fingerprint_count++; 682 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 683 } 684 685 /* Find an entry for a fingerprints class/version/subtype */ 686 struct name_entry * 687 fingerprint_name_entry(struct name_list *list, char *name) 688 { 689 struct name_entry *nm_entry; 690 691 if (name == NULL || strlen(name) == 0) 692 return (NULL); 693 694 LIST_FOREACH(nm_entry, list, nm_entry) { 695 if (strcasecmp(nm_entry->nm_name, name) == 0) { 696 /* We'll move this to the front of the list later */ 697 LIST_REMOVE(nm_entry, nm_entry); 698 break; 699 } 700 } 701 if (nm_entry == NULL) { 702 nm_entry = calloc(1, sizeof(*nm_entry)); 703 if (nm_entry == NULL) 704 err(1, "calloc"); 705 LIST_INIT(&nm_entry->nm_sublist); 706 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 707 } 708 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 709 return (nm_entry); 710 } 711 712 713 void 714 print_name_list(int opts, struct name_list *nml, const char *prefix) 715 { 716 char newprefix[32]; 717 struct name_entry *nm; 718 719 LIST_FOREACH(nm, nml, nm_entry) { 720 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 721 nm->nm_name); 722 printf("%s\n", newprefix); 723 print_name_list(opts, &nm->nm_sublist, newprefix); 724 } 725 } 726 727 void 728 sort_name_list(int opts, struct name_list *nml) 729 { 730 struct name_list new; 731 struct name_entry *nm, *nmsearch, *nmlast; 732 733 /* yes yes, it's a very slow sort. so sue me */ 734 735 LIST_INIT(&new); 736 737 while ((nm = LIST_FIRST(nml)) != NULL) { 738 LIST_REMOVE(nm, nm_entry); 739 nmlast = NULL; 740 LIST_FOREACH(nmsearch, &new, nm_entry) { 741 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 742 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 743 break; 744 } 745 nmlast = nmsearch; 746 } 747 if (nmsearch == NULL) { 748 if (nmlast) 749 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 750 else 751 LIST_INSERT_HEAD(&new, nm, nm_entry); 752 } 753 754 sort_name_list(opts, &nm->nm_sublist); 755 } 756 nmlast = NULL; 757 while ((nm = LIST_FIRST(&new)) != NULL) { 758 LIST_REMOVE(nm, nm_entry); 759 if (nmlast == NULL) 760 LIST_INSERT_HEAD(nml, nm, nm_entry); 761 else 762 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 763 nmlast = nm; 764 } 765 return; 766 } 767 768 /* parse the next integer in a formatted config file line */ 769 int 770 get_int(u_char **line, size_t *len, int *var, int *mod, 771 const char *name, int flags, int max, const char *filename, int lineno) 772 { 773 int fieldlen, i; 774 u_char *field; 775 long val = 0; 776 777 if (mod) 778 *mod = 0; 779 *var = 0; 780 781 field = get_field(line, len, &fieldlen); 782 if (field == NULL) 783 return (1); 784 if (fieldlen == 0) { 785 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 786 return (1); 787 } 788 789 i = 0; 790 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 791 && fieldlen >= 1) { 792 switch (*field) { 793 case 'S': 794 if (mod && (flags & T_MSS)) 795 *mod = T_MSS; 796 if (fieldlen == 1) 797 return (0); 798 break; 799 case 'T': 800 if (mod && (flags & T_MTU)) 801 *mod = T_MTU; 802 if (fieldlen == 1) 803 return (0); 804 break; 805 case '*': 806 if (fieldlen != 1) { 807 fprintf(stderr, "%s:%d long '%c' %s\n", 808 filename, lineno, *field, name); 809 return (1); 810 } 811 if (mod && (flags & T_DC)) { 812 *mod = T_DC; 813 return (0); 814 } 815 case '%': 816 if (mod && (flags & T_MOD)) 817 *mod = T_MOD; 818 if (fieldlen == 1) { 819 fprintf(stderr, "%s:%d modulus %s must have a " 820 "value\n", filename, lineno, name); 821 return (1); 822 } 823 break; 824 } 825 if (mod == NULL || *mod == 0) { 826 fprintf(stderr, "%s:%d does not allow %c' %s\n", 827 filename, lineno, *field, name); 828 return (1); 829 } 830 i++; 831 } 832 833 for (; i < fieldlen; i++) { 834 if (field[i] < '0' || field[i] > '9') { 835 fprintf(stderr, "%s:%d non-digit character in %s\n", 836 filename, lineno, name); 837 return (1); 838 } 839 val = val * 10 + field[i] - '0'; 840 if (val < 0) { 841 fprintf(stderr, "%s:%d %s overflowed\n", filename, 842 lineno, name); 843 return (1); 844 } 845 } 846 847 if (val > max) { 848 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 849 name, val, max); 850 return (1); 851 } 852 *var = (int)val; 853 854 return (0); 855 } 856 857 /* parse the next string in a formatted config file line */ 858 int 859 get_str(u_char **line, size_t *len, char **v, const char *name, int minlen, 860 const char *filename, int lineno) 861 { 862 int fieldlen; 863 char *ptr; 864 865 ptr = get_field(line, len, &fieldlen); 866 if (ptr == NULL) 867 return (1); 868 if (fieldlen < minlen) { 869 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 870 return (1); 871 } 872 if ((*v = malloc(fieldlen + 1)) == NULL) { 873 perror("malloc()"); 874 return (1); 875 } 876 memcpy(*v, ptr, fieldlen); 877 (*v)[fieldlen] = '\0'; 878 879 return (0); 880 } 881 882 /* Parse out the TCP opts */ 883 int 884 get_tcpopts(const char *filename, int lineno, const u_char *tcpopts, 885 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 886 int *wscale_mod, int *ts0) 887 { 888 int i, opt; 889 890 *packed = 0; 891 *optcnt = 0; 892 *wscale = 0; 893 *wscale_mod = T_DC; 894 *mss = 0; 895 *mss_mod = T_DC; 896 *ts0 = 0; 897 if (strcmp(tcpopts, ".") == 0) 898 return (0); 899 900 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 901 switch ((opt = toupper(tcpopts[i++]))) { 902 case 'N': /* FALLTHROUGH */ 903 case 'S': 904 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 905 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 906 PF_OSFP_TCPOPT_SACK); 907 break; 908 case 'W': /* FALLTHROUGH */ 909 case 'M': { 910 int *this_mod, *this; 911 912 if (opt == 'W') { 913 this = wscale; 914 this_mod = wscale_mod; 915 } else { 916 this = mss; 917 this_mod = mss_mod; 918 } 919 *this = 0; 920 *this_mod = 0; 921 922 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 923 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 924 PF_OSFP_TCPOPT_MSS); 925 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 926 tcpopts[i + 1] == ',')) { 927 *this_mod = T_DC; 928 i++; 929 break; 930 } 931 932 if (tcpopts[i] == '%') { 933 *this_mod = T_MOD; 934 i++; 935 } 936 do { 937 if (!isdigit(tcpopts[i])) { 938 fprintf(stderr, "%s:%d unknown " 939 "character '%c' in %c TCP opt\n", 940 filename, lineno, tcpopts[i], opt); 941 return (1); 942 } 943 *this = (*this * 10) + tcpopts[i++] - '0'; 944 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 945 break; 946 } 947 case 'T': 948 if (tcpopts[i] == '0') { 949 *ts0 = 1; 950 i++; 951 } 952 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 953 PF_OSFP_TCPOPT_TS; 954 break; 955 } 956 (*optcnt) ++; 957 if (tcpopts[i] == '\0') 958 break; 959 if (tcpopts[i] != ',') { 960 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 961 filename, lineno, opt); 962 return (1); 963 } 964 i++; 965 } 966 967 return (0); 968 } 969 970 /* rip the next field ouf of a formatted config file line */ 971 char * 972 get_field(u_char **line, size_t *len, int *fieldlen) 973 { 974 char *ret, *ptr = *line; 975 size_t plen = *len; 976 977 978 while (plen && isspace((unsigned char)*ptr)) { 979 plen--; 980 ptr++; 981 } 982 ret = ptr; 983 *fieldlen = 0; 984 985 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 986 (*fieldlen)++; 987 if (plen) { 988 *line = ptr + 1; 989 *len = plen - 1; 990 } else { 991 *len = 0; 992 } 993 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1])) 994 (*fieldlen)--; 995 return (ret); 996 } 997 998 999 const char * 1000 print_ioctl(struct pf_osfp_ioctl *fp) 1001 { 1002 static char buf[1024]; 1003 char tmp[32]; 1004 int i, opt; 1005 1006 *buf = '\0'; 1007 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1008 strlcat(buf, "*", sizeof(buf)); 1009 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1010 strlcat(buf, "S", sizeof(buf)); 1011 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1012 strlcat(buf, "T", sizeof(buf)); 1013 else { 1014 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1015 strlcat(buf, "%", sizeof(buf)); 1016 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1017 strlcat(buf, tmp, sizeof(buf)); 1018 } 1019 strlcat(buf, ":", sizeof(buf)); 1020 1021 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1022 strlcat(buf, tmp, sizeof(buf)); 1023 strlcat(buf, ":", sizeof(buf)); 1024 1025 if (fp->fp_flags & PF_OSFP_DF) 1026 strlcat(buf, "1", sizeof(buf)); 1027 else 1028 strlcat(buf, "0", sizeof(buf)); 1029 strlcat(buf, ":", sizeof(buf)); 1030 1031 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1032 strlcat(buf, "*", sizeof(buf)); 1033 else { 1034 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1035 strlcat(buf, "%", sizeof(buf)); 1036 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1037 strlcat(buf, tmp, sizeof(buf)); 1038 } 1039 strlcat(buf, ":", sizeof(buf)); 1040 1041 if (fp->fp_optcnt == 0) 1042 strlcat(buf, ".", sizeof(buf)); 1043 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1044 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1045 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1046 switch (opt) { 1047 case PF_OSFP_TCPOPT_NOP: 1048 strlcat(buf, "N", sizeof(buf)); 1049 break; 1050 case PF_OSFP_TCPOPT_SACK: 1051 strlcat(buf, "S", sizeof(buf)); 1052 break; 1053 case PF_OSFP_TCPOPT_TS: 1054 strlcat(buf, "T", sizeof(buf)); 1055 if (fp->fp_flags & PF_OSFP_TS0) 1056 strlcat(buf, "0", sizeof(buf)); 1057 break; 1058 case PF_OSFP_TCPOPT_MSS: 1059 strlcat(buf, "M", sizeof(buf)); 1060 if (fp->fp_flags & PF_OSFP_MSS_DC) 1061 strlcat(buf, "*", sizeof(buf)); 1062 else { 1063 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1064 strlcat(buf, "%", sizeof(buf)); 1065 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1066 strlcat(buf, tmp, sizeof(buf)); 1067 } 1068 break; 1069 case PF_OSFP_TCPOPT_WSCALE: 1070 strlcat(buf, "W", sizeof(buf)); 1071 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1072 strlcat(buf, "*", sizeof(buf)); 1073 else { 1074 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1075 strlcat(buf, "%", sizeof(buf)); 1076 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1077 strlcat(buf, tmp, sizeof(buf)); 1078 } 1079 break; 1080 } 1081 1082 if (i != 0) 1083 strlcat(buf, ",", sizeof(buf)); 1084 } 1085 strlcat(buf, ":", sizeof(buf)); 1086 1087 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1088 strlcat(buf, ":", sizeof(buf)); 1089 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1090 strlcat(buf, ":", sizeof(buf)); 1091 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1092 strlcat(buf, ":", sizeof(buf)); 1093 1094 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1095 (long long int)fp->fp_tcpopts); 1096 strlcat(buf, tmp, sizeof(buf)); 1097 1098 return (buf); 1099 } 1100