1 /* $OpenBSD: pfctl_osfp.c,v 1.11 2015/12/05 19:27:17 mmcc 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 37 #include "privsep.h" 38 #include "pfctl_parser.h" 39 40 #ifndef MIN 41 # define MIN(a,b) (((a) < (b)) ? (a) : (b)) 42 #endif /* MIN */ 43 #ifndef MAX 44 # define MAX(a,b) (((a) > (b)) ? (a) : (b)) 45 #endif /* MAX */ 46 47 48 #if 0 49 # define DEBUG(fp, str, v...) \ 50 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 51 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 52 #else 53 # define DEBUG(fp, str, v...) ((void)0) 54 #endif 55 56 57 struct name_entry; 58 LIST_HEAD(name_list, name_entry); 59 struct name_entry { 60 LIST_ENTRY(name_entry) nm_entry; 61 int nm_num; 62 char nm_name[PF_OSFP_LEN]; 63 64 struct name_list nm_sublist; 65 int nm_sublist_num; 66 }; 67 struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 68 int class_count; 69 int fingerprint_count; 70 71 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 72 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 73 void pfctl_flush_my_fingerprints(struct name_list *); 74 char *get_field(u_char **, size_t *, int *); 75 int get_int(u_char **, size_t *, int *, int *, const char *, 76 int, int, const char *, int); 77 int get_str(u_char **, size_t *, char **, const char *, int, 78 const char *, int); 79 int get_tcpopts(const char *, int, const u_char *, 80 pf_tcpopts_t *, int *, int *, int *, int *, int *, 81 int *); 82 void import_fingerprint(struct pf_osfp_ioctl *); 83 const char *print_ioctl(struct pf_osfp_ioctl *); 84 void print_name_list(int, struct name_list *, const char *); 85 void sort_name_list(int, struct name_list *); 86 struct name_entry *lookup_name_list(struct name_list *, const char *); 87 88 /* XXX arbitrary */ 89 #define MAX_FP_LINE 1024 90 91 /* Load fingerprints from a file */ 92 int 93 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 94 { 95 u_char buf[MAX_FP_LINE]; 96 u_char *line; 97 size_t len; 98 int i, lineno = 0; 99 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 100 wscale_mod, optcnt, ts0; 101 pf_tcpopts_t packed_tcpopts; 102 char *class, *version, *subtype, *desc, *tcpopts; 103 struct pf_osfp_ioctl fp; 104 105 pfctl_flush_my_fingerprints(&classes); 106 class = version = subtype = desc = tcpopts = NULL; 107 108 if ((opts & PF_OPT_NOACTION) == 0) 109 pfctl_clear_fingerprints(dev, opts); 110 111 priv_getlines(FTAB_PFOSFP); 112 while ((len = priv_getline(buf, sizeof(buf))) > 0) { 113 buf[len -1] = '\n'; 114 line = buf; 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); 253 254 if (opts & PF_OPT_VERBOSE2) 255 printf("Loaded %d passive OS fingerprints\n", 256 fingerprint_count); 257 return (0); 258 } 259 260 /* flush the kernel's fingerprints */ 261 void 262 pfctl_clear_fingerprints(int dev, int opts) 263 { 264 if (ioctl(dev, DIOCOSFPFLUSH)) 265 err(1, "DIOCOSFPFLUSH"); 266 } 267 268 /* flush pfctl's view of the fingerprints */ 269 void 270 pfctl_flush_my_fingerprints(struct name_list *list) 271 { 272 struct name_entry *nm; 273 274 while ((nm = LIST_FIRST(list)) != NULL) { 275 LIST_REMOVE(nm, nm_entry); 276 pfctl_flush_my_fingerprints(&nm->nm_sublist); 277 fingerprint_count--; 278 free(nm); 279 } 280 class_count = 0; 281 } 282 283 /* Fetch the active fingerprints from the kernel */ 284 int 285 pfctl_load_fingerprints(int dev, int opts) 286 { 287 struct pf_osfp_ioctl io; 288 int i; 289 290 pfctl_flush_my_fingerprints(&classes); 291 292 for (i = 0; i >= 0; i++) { 293 memset(&io, 0, sizeof(io)); 294 io.fp_getnum = i; 295 if (ioctl(dev, DIOCOSFPGET, &io)) { 296 if (errno == EBUSY) 297 break; 298 warn("DIOCOSFPGET"); 299 return (1); 300 } 301 import_fingerprint(&io); 302 } 303 return (0); 304 } 305 306 /* List the fingerprints */ 307 void 308 pfctl_show_fingerprints(int opts) 309 { 310 printf("Passive OS Fingerprints:\n"); 311 printf("\tClass\tVersion\tSubtype(subversion)\n"); 312 printf("\t-----\t-------\t-------------------\n"); 313 sort_name_list(opts, &classes); 314 print_name_list(opts, &classes, "\t"); 315 } 316 317 /* Lookup a fingerprint */ 318 pf_osfp_t 319 pfctl_get_fingerprint(const char *name) 320 { 321 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 322 pf_osfp_t ret = PF_OSFP_NOMATCH; 323 int class, version, subtype; 324 int unp_class, unp_version, unp_subtype; 325 int wr_len, version_len, subtype_len; 326 char *ptr, *wr_name; 327 328 if (strcasecmp(name, "unknown") == 0) 329 return (PF_OSFP_UNKNOWN); 330 331 /* Try most likely no version and no subtype */ 332 if ((nm = lookup_name_list(&classes, name))) { 333 class = nm->nm_num; 334 version = PF_OSFP_ANY; 335 subtype = PF_OSFP_ANY; 336 goto found; 337 } else { 338 339 /* Chop it up into class/version/subtype */ 340 341 if ((wr_name = strdup(name)) == NULL) 342 err(1, "malloc"); 343 if ((ptr = strchr(wr_name, ' ')) == NULL) { 344 free(wr_name); 345 return (PF_OSFP_NOMATCH); 346 } 347 *ptr++ = '\0'; 348 349 /* The class is easy to find since it is delimited by a space */ 350 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 351 free(wr_name); 352 return (PF_OSFP_NOMATCH); 353 } 354 class = class_nm->nm_num; 355 356 /* Try no subtype */ 357 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 358 { 359 version = version_nm->nm_num; 360 subtype = PF_OSFP_ANY; 361 free(wr_name); 362 goto found; 363 } 364 365 366 /* 367 * There must be a version and a subtype. 368 * We'll do some fuzzy matching to pick up things like: 369 * Linux 2.2.14 (version=2.2 subtype=14) 370 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 371 * Windows 2000 SP2 (version=2000 subtype=SP2) 372 */ 373 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 374 wr_len = strlen(ptr); 375 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 376 version_len = strlen(version_nm->nm_name); 377 if (wr_len < version_len + 2 || 378 !CONNECTOR(ptr[version_len])) 379 continue; 380 /* first part of the string must be version */ 381 if (strncasecmp(ptr, version_nm->nm_name, 382 version_len)) 383 continue; 384 385 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 386 nm_entry) { 387 subtype_len = strlen(subtype_nm->nm_name); 388 if (wr_len != version_len + subtype_len + 1) 389 continue; 390 391 /* last part of the string must be subtype */ 392 if (strcasecmp(&ptr[version_len+1], 393 subtype_nm->nm_name) != 0) 394 continue; 395 396 /* Found it!! */ 397 version = version_nm->nm_num; 398 subtype = subtype_nm->nm_num; 399 free(wr_name); 400 goto found; 401 } 402 } 403 404 free(wr_name); 405 return (PF_OSFP_NOMATCH); 406 } 407 408 found: 409 PF_OSFP_PACK(ret, class, version, subtype); 410 if (ret != PF_OSFP_NOMATCH) { 411 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 412 if (class != unp_class) { 413 fprintf(stderr, "warning: fingerprint table overflowed " 414 "classes\n"); 415 return (PF_OSFP_NOMATCH); 416 } 417 if (version != unp_version) { 418 fprintf(stderr, "warning: fingerprint table overflowed " 419 "versions\n"); 420 return (PF_OSFP_NOMATCH); 421 } 422 if (subtype != unp_subtype) { 423 fprintf(stderr, "warning: fingerprint table overflowed " 424 "subtypes\n"); 425 return (PF_OSFP_NOMATCH); 426 } 427 } 428 if (ret == PF_OSFP_ANY) { 429 /* should never happen */ 430 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 431 return (PF_OSFP_NOMATCH); 432 } 433 434 return (ret); 435 } 436 437 /* Lookup a fingerprint name by ID */ 438 char * 439 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 440 { 441 int class, version, subtype; 442 struct name_list *list; 443 struct name_entry *nm; 444 445 u_char *class_name, *version_name, *subtype_name; 446 class_name = version_name = subtype_name = NULL; 447 448 if (fp == PF_OSFP_UNKNOWN) { 449 strlcpy(buf, "unknown", len); 450 return (buf); 451 } 452 if (fp == PF_OSFP_ANY) { 453 strlcpy(buf, "any", len); 454 return (buf); 455 } 456 457 PF_OSFP_UNPACK(fp, class, version, subtype); 458 if (class >= (1 << _FP_CLASS_BITS) || 459 version >= (1 << _FP_VERSION_BITS) || 460 subtype >= (1 << _FP_SUBTYPE_BITS)) { 461 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 462 strlcpy(buf, "nomatch", len); 463 return (buf); 464 } 465 466 LIST_FOREACH(nm, &classes, nm_entry) { 467 if (nm->nm_num == class) { 468 class_name = nm->nm_name; 469 if (version == PF_OSFP_ANY) 470 goto found; 471 list = &nm->nm_sublist; 472 LIST_FOREACH(nm, list, nm_entry) { 473 if (nm->nm_num == version) { 474 version_name = nm->nm_name; 475 if (subtype == PF_OSFP_ANY) 476 goto found; 477 list = &nm->nm_sublist; 478 LIST_FOREACH(nm, list, nm_entry) { 479 if (nm->nm_num == subtype) { 480 subtype_name = 481 nm->nm_name; 482 goto found; 483 } 484 } /* foreach subtype */ 485 strlcpy(buf, "nomatch", len); 486 return (buf); 487 } 488 } /* foreach version */ 489 strlcpy(buf, "nomatch", len); 490 return (buf); 491 } 492 } /* foreach class */ 493 494 strlcpy(buf, "nomatch", len); 495 return (buf); 496 497 found: 498 snprintf(buf, len, "%s", class_name); 499 if (version_name) { 500 strlcat(buf, " ", len); 501 strlcat(buf, version_name, len); 502 if (subtype_name) { 503 if (strchr(version_name, ' ')) 504 strlcat(buf, " ", len); 505 else if (strchr(version_name, '.') && 506 isdigit(*subtype_name)) 507 strlcat(buf, ".", len); 508 else 509 strlcat(buf, " ", len); 510 strlcat(buf, subtype_name, len); 511 } 512 } 513 return (buf); 514 } 515 516 /* lookup a name in a list */ 517 struct name_entry * 518 lookup_name_list(struct name_list *list, const char *name) 519 { 520 struct name_entry *nm; 521 LIST_FOREACH(nm, list, nm_entry) 522 if (strcasecmp(name, nm->nm_name) == 0) 523 return (nm); 524 525 return (NULL); 526 } 527 528 529 void 530 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 531 { 532 struct pf_osfp_ioctl fptmp; 533 struct name_entry *nm_class, *nm_version, *nm_subtype; 534 int class, version, subtype; 535 536 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 537 #define EXPAND(field) do { \ 538 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 539 /* pick major version out of #.# */ \ 540 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ 541 _dot = fp->field[_i] - '0'; \ 542 _i += 2; \ 543 } \ 544 if (isdigit(fp->field[_i])) \ 545 _start = fp->field[_i++] - '0'; \ 546 else \ 547 break; \ 548 if (isdigit(fp->field[_i])) \ 549 _start = (_start * 10) + fp->field[_i++] - '0'; \ 550 if (fp->field[_i++] != '-') \ 551 break; \ 552 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ 553 fp->field[_i] - '0' == _dot) \ 554 _i += 2; \ 555 else if (_dot != -1) \ 556 break; \ 557 if (isdigit(fp->field[_i])) \ 558 _end = fp->field[_i++] - '0'; \ 559 else \ 560 break; \ 561 if (isdigit(fp->field[_i])) \ 562 _end = (_end * 10) + fp->field[_i++] - '0'; \ 563 if (isdigit(fp->field[_i])) \ 564 _end = (_end * 10) + fp->field[_i++] - '0'; \ 565 if (fp->field[_i] != '\0') \ 566 break; \ 567 memcpy(&fptmp, fp, sizeof(fptmp)); \ 568 for (;_start <= _end; _start++) { \ 569 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 570 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 571 if (_dot == -1) \ 572 snprintf(fptmp.field, sizeof(fptmp.field), \ 573 "%d", _start); \ 574 else \ 575 snprintf(fptmp.field, sizeof(fptmp.field), \ 576 "%d.%d", _dot, _start); \ 577 add_fingerprint(dev, opts, &fptmp); \ 578 } \ 579 } while(0) 580 581 /* We allow "#-#" as a version or subtype and we'll expand it */ 582 EXPAND(fp_os.fp_version_nm); 583 EXPAND(fp_os.fp_subtype_nm); 584 585 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 586 errx(1, "fingerprint class \"nomatch\" is reserved"); 587 588 version = PF_OSFP_ANY; 589 subtype = PF_OSFP_ANY; 590 591 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 592 if (nm_class->nm_num == 0) 593 nm_class->nm_num = ++class_count; 594 class = nm_class->nm_num; 595 596 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 597 fp->fp_os.fp_version_nm); 598 if (nm_version) { 599 if (nm_version->nm_num == 0) 600 nm_version->nm_num = ++nm_class->nm_sublist_num; 601 version = nm_version->nm_num; 602 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 603 fp->fp_os.fp_subtype_nm); 604 if (nm_subtype) { 605 if (nm_subtype->nm_num == 0) 606 nm_subtype->nm_num = 607 ++nm_version->nm_sublist_num; 608 subtype = nm_subtype->nm_num; 609 } 610 } 611 612 613 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 614 print_ioctl(fp)); 615 616 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 617 fingerprint_count++; 618 619 #ifdef FAKE_PF_KERNEL 620 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 621 if ((errno = pf_osfp_add(fp))) 622 #else 623 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) 624 #endif /* FAKE_PF_KERNEL */ 625 { 626 if (errno == EEXIST) { 627 warn("Duplicate signature for %s %s %s", 628 fp->fp_os.fp_class_nm, 629 fp->fp_os.fp_version_nm, 630 fp->fp_os.fp_subtype_nm); 631 632 } else { 633 err(1, "DIOCOSFPADD"); 634 } 635 } 636 } 637 638 /* import a fingerprint from the kernel */ 639 void 640 import_fingerprint(struct pf_osfp_ioctl *fp) 641 { 642 struct name_entry *nm_class, *nm_version, *nm_subtype; 643 int class, version, subtype; 644 645 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 646 647 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 648 if (nm_class->nm_num == 0) { 649 nm_class->nm_num = class; 650 class_count = MAX(class_count, class); 651 } 652 653 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 654 fp->fp_os.fp_version_nm); 655 if (nm_version) { 656 if (nm_version->nm_num == 0) { 657 nm_version->nm_num = version; 658 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, 659 version); 660 } 661 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 662 fp->fp_os.fp_subtype_nm); 663 if (nm_subtype) { 664 if (nm_subtype->nm_num == 0) { 665 nm_subtype->nm_num = subtype; 666 nm_version->nm_sublist_num = 667 MAX(nm_version->nm_sublist_num, subtype); 668 } 669 } 670 } 671 672 673 fingerprint_count++; 674 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 675 } 676 677 /* Find an entry for a fingerprints class/version/subtype */ 678 struct name_entry * 679 fingerprint_name_entry(struct name_list *list, char *name) 680 { 681 struct name_entry *nm_entry; 682 683 if (name == NULL || strlen(name) == 0) 684 return (NULL); 685 686 LIST_FOREACH(nm_entry, list, nm_entry) { 687 if (strcasecmp(nm_entry->nm_name, name) == 0) { 688 /* We'll move this to the front of the list later */ 689 LIST_REMOVE(nm_entry, nm_entry); 690 break; 691 } 692 } 693 if (nm_entry == NULL) { 694 nm_entry = calloc(1, sizeof(*nm_entry)); 695 if (nm_entry == NULL) 696 err(1, "calloc"); 697 LIST_INIT(&nm_entry->nm_sublist); 698 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 699 } 700 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 701 return (nm_entry); 702 } 703 704 705 void 706 print_name_list(int opts, struct name_list *nml, const char *prefix) 707 { 708 char newprefix[32]; 709 struct name_entry *nm; 710 711 LIST_FOREACH(nm, nml, nm_entry) { 712 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 713 nm->nm_name); 714 printf("%s\n", newprefix); 715 print_name_list(opts, &nm->nm_sublist, newprefix); 716 } 717 } 718 719 void 720 sort_name_list(int opts, struct name_list *nml) 721 { 722 struct name_list new; 723 struct name_entry *nm, *nmsearch, *nmlast; 724 725 /* yes yes, it's a very slow sort. so sue me */ 726 727 LIST_INIT(&new); 728 729 while ((nm = LIST_FIRST(nml)) != NULL) { 730 LIST_REMOVE(nm, nm_entry); 731 nmlast = NULL; 732 LIST_FOREACH(nmsearch, &new, nm_entry) { 733 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 734 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 735 break; 736 } 737 nmlast = nmsearch; 738 } 739 if (nmsearch == NULL) { 740 if (nmlast) 741 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 742 else 743 LIST_INSERT_HEAD(&new, nm, nm_entry); 744 } 745 746 sort_name_list(opts, &nm->nm_sublist); 747 } 748 nmlast = NULL; 749 while ((nm = LIST_FIRST(&new)) != NULL) { 750 LIST_REMOVE(nm, nm_entry); 751 if (nmlast == NULL) 752 LIST_INSERT_HEAD(nml, nm, nm_entry); 753 else 754 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 755 nmlast = nm; 756 } 757 return; 758 } 759 760 /* parse the next integer in a formatted config file line */ 761 int 762 get_int(u_char **line, size_t *len, int *var, int *mod, 763 const char *name, int flags, int max, const char *filename, int lineno) 764 { 765 int fieldlen, i; 766 u_char *field; 767 long val = 0; 768 769 if (mod) 770 *mod = 0; 771 *var = 0; 772 773 field = get_field(line, len, &fieldlen); 774 if (field == NULL) 775 return (1); 776 if (fieldlen == 0) { 777 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 778 return (1); 779 } 780 781 i = 0; 782 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 783 && fieldlen >= 1) { 784 switch (*field) { 785 case 'S': 786 if (mod && (flags & T_MSS)) 787 *mod = T_MSS; 788 if (fieldlen == 1) 789 return (0); 790 break; 791 case 'T': 792 if (mod && (flags & T_MTU)) 793 *mod = T_MTU; 794 if (fieldlen == 1) 795 return (0); 796 break; 797 case '*': 798 if (fieldlen != 1) { 799 fprintf(stderr, "%s:%d long '%c' %s\n", 800 filename, lineno, *field, name); 801 return (1); 802 } 803 if (mod && (flags & T_DC)) { 804 *mod = T_DC; 805 return (0); 806 } 807 case '%': 808 if (mod && (flags & T_MOD)) 809 *mod = T_MOD; 810 if (fieldlen == 1) { 811 fprintf(stderr, "%s:%d modulus %s must have a " 812 "value\n", filename, lineno, name); 813 return (1); 814 } 815 break; 816 } 817 if (mod == NULL || *mod == 0) { 818 fprintf(stderr, "%s:%d does not allow %c' %s\n", 819 filename, lineno, *field, name); 820 return (1); 821 } 822 i++; 823 } 824 825 for (; i < fieldlen; i++) { 826 if (field[i] < '0' || field[i] > '9') { 827 fprintf(stderr, "%s:%d non-digit character in %s\n", 828 filename, lineno, name); 829 return (1); 830 } 831 val = val * 10 + field[i] - '0'; 832 if (val < 0) { 833 fprintf(stderr, "%s:%d %s overflowed\n", filename, 834 lineno, name); 835 return (1); 836 } 837 } 838 839 if (val > max) { 840 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 841 name, val, max); 842 return (1); 843 } 844 *var = (int)val; 845 846 return (0); 847 } 848 849 /* parse the next string in a formatted config file line */ 850 int 851 get_str(u_char **line, size_t *len, char **v, const char *name, int minlen, 852 const char *filename, int lineno) 853 { 854 int fieldlen; 855 char *ptr; 856 857 ptr = get_field(line, len, &fieldlen); 858 if (ptr == NULL) 859 return (1); 860 if (fieldlen < minlen) { 861 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 862 return (1); 863 } 864 if ((*v = malloc(fieldlen + 1)) == NULL) { 865 perror("malloc()"); 866 return (1); 867 } 868 memcpy(*v, ptr, fieldlen); 869 (*v)[fieldlen] = '\0'; 870 871 return (0); 872 } 873 874 /* Parse out the TCP opts */ 875 int 876 get_tcpopts(const char *filename, int lineno, const u_char *tcpopts, 877 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 878 int *wscale_mod, int *ts0) 879 { 880 int i, opt; 881 882 *packed = 0; 883 *optcnt = 0; 884 *wscale = 0; 885 *wscale_mod = T_DC; 886 *mss = 0; 887 *mss_mod = T_DC; 888 *ts0 = 0; 889 if (strcmp(tcpopts, ".") == 0) 890 return (0); 891 892 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 893 switch ((opt = toupper(tcpopts[i++]))) { 894 case 'N': /* FALLTHROUGH */ 895 case 'S': 896 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 897 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 898 PF_OSFP_TCPOPT_SACK); 899 break; 900 case 'W': /* FALLTHROUGH */ 901 case 'M': { 902 int *this_mod, *this; 903 904 if (opt == 'W') { 905 this = wscale; 906 this_mod = wscale_mod; 907 } else { 908 this = mss; 909 this_mod = mss_mod; 910 } 911 *this = 0; 912 *this_mod = 0; 913 914 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 915 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 916 PF_OSFP_TCPOPT_MSS); 917 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 918 tcpopts[i + 1] == ',')) { 919 *this_mod = T_DC; 920 i++; 921 break; 922 } 923 924 if (tcpopts[i] == '%') { 925 *this_mod = T_MOD; 926 i++; 927 } 928 do { 929 if (!isdigit(tcpopts[i])) { 930 fprintf(stderr, "%s:%d unknown " 931 "character '%c' in %c TCP opt\n", 932 filename, lineno, tcpopts[i], opt); 933 return (1); 934 } 935 *this = (*this * 10) + tcpopts[i++] - '0'; 936 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 937 break; 938 } 939 case 'T': 940 if (tcpopts[i] == '0') { 941 *ts0 = 1; 942 i++; 943 } 944 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 945 PF_OSFP_TCPOPT_TS; 946 break; 947 } 948 (*optcnt) ++; 949 if (tcpopts[i] == '\0') 950 break; 951 if (tcpopts[i] != ',') { 952 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 953 filename, lineno, opt); 954 return (1); 955 } 956 i++; 957 } 958 959 return (0); 960 } 961 962 /* rip the next field ouf of a formatted config file line */ 963 char * 964 get_field(u_char **line, size_t *len, int *fieldlen) 965 { 966 char *ret, *ptr = *line; 967 size_t plen = *len; 968 969 970 while (plen && isspace((unsigned char)*ptr)) { 971 plen--; 972 ptr++; 973 } 974 ret = ptr; 975 *fieldlen = 0; 976 977 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 978 (*fieldlen)++; 979 if (plen) { 980 *line = ptr + 1; 981 *len = plen - 1; 982 } else { 983 *len = 0; 984 } 985 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1])) 986 (*fieldlen)--; 987 return (ret); 988 } 989 990 991 const char * 992 print_ioctl(struct pf_osfp_ioctl *fp) 993 { 994 static char buf[1024]; 995 char tmp[32]; 996 int i, opt; 997 998 *buf = '\0'; 999 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1000 strlcat(buf, "*", sizeof(buf)); 1001 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1002 strlcat(buf, "S", sizeof(buf)); 1003 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1004 strlcat(buf, "T", sizeof(buf)); 1005 else { 1006 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1007 strlcat(buf, "%", sizeof(buf)); 1008 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1009 strlcat(buf, tmp, sizeof(buf)); 1010 } 1011 strlcat(buf, ":", sizeof(buf)); 1012 1013 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1014 strlcat(buf, tmp, sizeof(buf)); 1015 strlcat(buf, ":", sizeof(buf)); 1016 1017 if (fp->fp_flags & PF_OSFP_DF) 1018 strlcat(buf, "1", sizeof(buf)); 1019 else 1020 strlcat(buf, "0", sizeof(buf)); 1021 strlcat(buf, ":", sizeof(buf)); 1022 1023 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1024 strlcat(buf, "*", sizeof(buf)); 1025 else { 1026 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1027 strlcat(buf, "%", sizeof(buf)); 1028 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1029 strlcat(buf, tmp, sizeof(buf)); 1030 } 1031 strlcat(buf, ":", sizeof(buf)); 1032 1033 if (fp->fp_optcnt == 0) 1034 strlcat(buf, ".", sizeof(buf)); 1035 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1036 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1037 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1038 switch (opt) { 1039 case PF_OSFP_TCPOPT_NOP: 1040 strlcat(buf, "N", sizeof(buf)); 1041 break; 1042 case PF_OSFP_TCPOPT_SACK: 1043 strlcat(buf, "S", sizeof(buf)); 1044 break; 1045 case PF_OSFP_TCPOPT_TS: 1046 strlcat(buf, "T", sizeof(buf)); 1047 if (fp->fp_flags & PF_OSFP_TS0) 1048 strlcat(buf, "0", sizeof(buf)); 1049 break; 1050 case PF_OSFP_TCPOPT_MSS: 1051 strlcat(buf, "M", sizeof(buf)); 1052 if (fp->fp_flags & PF_OSFP_MSS_DC) 1053 strlcat(buf, "*", sizeof(buf)); 1054 else { 1055 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1056 strlcat(buf, "%", sizeof(buf)); 1057 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1058 strlcat(buf, tmp, sizeof(buf)); 1059 } 1060 break; 1061 case PF_OSFP_TCPOPT_WSCALE: 1062 strlcat(buf, "W", sizeof(buf)); 1063 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1064 strlcat(buf, "*", sizeof(buf)); 1065 else { 1066 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1067 strlcat(buf, "%", sizeof(buf)); 1068 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1069 strlcat(buf, tmp, sizeof(buf)); 1070 } 1071 break; 1072 } 1073 1074 if (i != 0) 1075 strlcat(buf, ",", sizeof(buf)); 1076 } 1077 strlcat(buf, ":", sizeof(buf)); 1078 1079 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1080 strlcat(buf, ":", sizeof(buf)); 1081 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1082 strlcat(buf, ":", sizeof(buf)); 1083 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1084 strlcat(buf, ":", sizeof(buf)); 1085 1086 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1087 (long long int)fp->fp_tcpopts); 1088 strlcat(buf, tmp, sizeof(buf)); 1089 1090 return (buf); 1091 } 1092