1 /* $OpenBSD: pfctl_osfp.c,v 1.14 2006/04/08 02:13:14 ray Exp $ */
2
3 /*
4 * Copyright (c) 2003 Mike Frantzen <[email protected]>
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/cdefs.h>
20 __FBSDID("$FreeBSD$");
21
22 #include <sys/types.h>
23 #include <sys/ioctl.h>
24 #include <sys/socket.h>
25
26 #include <net/if.h>
27 #include <net/pfvar.h>
28
29 #include <netinet/in_systm.h>
30 #include <netinet/ip.h>
31 #include <netinet/ip6.h>
32
33 #include <ctype.h>
34 #include <err.h>
35 #include <errno.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #include "pfctl_parser.h"
41 #include "pfctl.h"
42
43 #ifndef MIN
44 # define MIN(a,b) (((a) < (b)) ? (a) : (b))
45 #endif /* MIN */
46 #ifndef MAX
47 # define MAX(a,b) (((a) > (b)) ? (a) : (b))
48 #endif /* MAX */
49
50
51 #if 0
52 # define DEBUG(fp, str, v...) \
53 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
54 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
55 #else
56 # define DEBUG(fp, str, v...) ((void)0)
57 #endif
58
59
60 struct name_entry;
61 LIST_HEAD(name_list, name_entry);
62 struct name_entry {
63 LIST_ENTRY(name_entry) nm_entry;
64 int nm_num;
65 char nm_name[PF_OSFP_LEN];
66
67 struct name_list nm_sublist;
68 int nm_sublist_num;
69 };
70 static struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
71 static int class_count;
72 static int fingerprint_count;
73
74 void add_fingerprint(int, int, struct pf_osfp_ioctl *);
75 struct name_entry *fingerprint_name_entry(struct name_list *, char *);
76 void pfctl_flush_my_fingerprints(struct name_list *);
77 char *get_field(char **, size_t *, int *);
78 int get_int(char **, size_t *, int *, int *, const char *,
79 int, int, const char *, int);
80 int get_str(char **, size_t *, char **, const char *, int,
81 const char *, int);
82 int get_tcpopts(const char *, int, const char *,
83 pf_tcpopts_t *, int *, int *, int *, int *, int *,
84 int *);
85 void import_fingerprint(struct pf_osfp_ioctl *);
86 const char *print_ioctl(struct pf_osfp_ioctl *);
87 void print_name_list(int, struct name_list *, const char *);
88 void sort_name_list(int, struct name_list *);
89 struct name_entry *lookup_name_list(struct name_list *, const char *);
90
91 /* Load fingerprints from a file */
92 int
pfctl_file_fingerprints(int dev,int opts,const char * fp_filename)93 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
94 {
95 FILE *in;
96 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
107 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) {
108 warn("%s", fp_filename);
109 return (1);
110 }
111 class = version = subtype = desc = tcpopts = NULL;
112
113 if ((opts & PF_OPT_NOACTION) == 0)
114 pfctl_clear_fingerprints(dev, opts);
115
116 while ((line = fgetln(in, &len)) != NULL) {
117 lineno++;
118 if (class)
119 free(class);
120 if (version)
121 free(version);
122 if (subtype)
123 free(subtype);
124 if (desc)
125 free(desc);
126 if (tcpopts)
127 free(tcpopts);
128 class = version = subtype = desc = tcpopts = NULL;
129 memset(&fp, 0, sizeof(fp));
130
131 /* Chop off comment */
132 for (i = 0; i < len; i++)
133 if (line[i] == '#') {
134 len = i;
135 break;
136 }
137 /* Chop off whitespace */
138 while (len > 0 && isspace(line[len - 1]))
139 len--;
140 while (len > 0 && isspace(line[0])) {
141 len--;
142 line++;
143 }
144 if (len == 0)
145 continue;
146
147 #define T_DC 0x01 /* Allow don't care */
148 #define T_MSS 0x02 /* Allow MSS multiple */
149 #define T_MTU 0x04 /* Allow MTU multiple */
150 #define T_MOD 0x08 /* Allow modulus */
151
152 #define GET_INT(v, mod, n, ty, mx) \
153 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
154 #define GET_STR(v, n, mn) \
155 get_str(&line, &len, &v, n, mn, fp_filename, lineno)
156
157 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
158 T_MOD, 0xffff) ||
159 GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
160 GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
161 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
162 8192) ||
163 GET_STR(tcpopts, "TCP Options", 1) ||
164 GET_STR(class, "OS class", 1) ||
165 GET_STR(version, "OS version", 0) ||
166 GET_STR(subtype, "OS subtype", 0) ||
167 GET_STR(desc, "OS description", 2))
168 continue;
169 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
170 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
171 continue;
172 if (len != 0) {
173 fprintf(stderr, "%s:%d excess field\n", fp_filename,
174 lineno);
175 continue;
176 }
177
178 fp.fp_ttl = ttl;
179 if (df)
180 fp.fp_flags |= PF_OSFP_DF;
181 switch (w_mod) {
182 case 0:
183 break;
184 case T_DC:
185 fp.fp_flags |= PF_OSFP_WSIZE_DC;
186 break;
187 case T_MSS:
188 fp.fp_flags |= PF_OSFP_WSIZE_MSS;
189 break;
190 case T_MTU:
191 fp.fp_flags |= PF_OSFP_WSIZE_MTU;
192 break;
193 case T_MOD:
194 fp.fp_flags |= PF_OSFP_WSIZE_MOD;
195 break;
196 }
197 fp.fp_wsize = window;
198
199 switch (p_mod) {
200 case T_DC:
201 fp.fp_flags |= PF_OSFP_PSIZE_DC;
202 break;
203 case T_MOD:
204 fp.fp_flags |= PF_OSFP_PSIZE_MOD;
205 }
206 fp.fp_psize = psize;
207
208
209 switch (wscale_mod) {
210 case T_DC:
211 fp.fp_flags |= PF_OSFP_WSCALE_DC;
212 break;
213 case T_MOD:
214 fp.fp_flags |= PF_OSFP_WSCALE_MOD;
215 }
216 fp.fp_wscale = wscale;
217
218 switch (mss_mod) {
219 case T_DC:
220 fp.fp_flags |= PF_OSFP_MSS_DC;
221 break;
222 case T_MOD:
223 fp.fp_flags |= PF_OSFP_MSS_MOD;
224 break;
225 }
226 fp.fp_mss = mss;
227
228 fp.fp_tcpopts = packed_tcpopts;
229 fp.fp_optcnt = optcnt;
230 if (ts0)
231 fp.fp_flags |= PF_OSFP_TS0;
232
233 if (class[0] == '@')
234 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
235 if (class[0] == '*')
236 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
237
238 if (class[0] == '@' || class[0] == '*')
239 strlcpy(fp.fp_os.fp_class_nm, class + 1,
240 sizeof(fp.fp_os.fp_class_nm));
241 else
242 strlcpy(fp.fp_os.fp_class_nm, class,
243 sizeof(fp.fp_os.fp_class_nm));
244 strlcpy(fp.fp_os.fp_version_nm, version,
245 sizeof(fp.fp_os.fp_version_nm));
246 strlcpy(fp.fp_os.fp_subtype_nm, subtype,
247 sizeof(fp.fp_os.fp_subtype_nm));
248
249 add_fingerprint(dev, opts, &fp);
250
251 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6);
252 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip);
253 add_fingerprint(dev, opts, &fp);
254 }
255
256 if (class)
257 free(class);
258 if (version)
259 free(version);
260 if (subtype)
261 free(subtype);
262 if (desc)
263 free(desc);
264 if (tcpopts)
265 free(tcpopts);
266
267 fclose(in);
268
269 if (opts & PF_OPT_VERBOSE2)
270 printf("Loaded %d passive OS fingerprints\n",
271 fingerprint_count);
272 return (0);
273 }
274
275 /* flush the kernel's fingerprints */
276 void
pfctl_clear_fingerprints(int dev,int opts)277 pfctl_clear_fingerprints(int dev, int opts)
278 {
279 if (ioctl(dev, DIOCOSFPFLUSH))
280 err(1, "DIOCOSFPFLUSH");
281 }
282
283 /* flush pfctl's view of the fingerprints */
284 void
pfctl_flush_my_fingerprints(struct name_list * list)285 pfctl_flush_my_fingerprints(struct name_list *list)
286 {
287 struct name_entry *nm;
288
289 while ((nm = LIST_FIRST(list)) != NULL) {
290 LIST_REMOVE(nm, nm_entry);
291 pfctl_flush_my_fingerprints(&nm->nm_sublist);
292 free(nm);
293 }
294 fingerprint_count = 0;
295 class_count = 0;
296 }
297
298 /* Fetch the active fingerprints from the kernel */
299 int
pfctl_load_fingerprints(int dev,int opts)300 pfctl_load_fingerprints(int dev, int opts)
301 {
302 struct pf_osfp_ioctl io;
303 int i;
304
305 pfctl_flush_my_fingerprints(&classes);
306
307 for (i = 0; i >= 0; i++) {
308 memset(&io, 0, sizeof(io));
309 io.fp_getnum = i;
310 if (ioctl(dev, DIOCOSFPGET, &io)) {
311 if (errno == EBUSY)
312 break;
313 warn("DIOCOSFPGET");
314 return (1);
315 }
316 import_fingerprint(&io);
317 }
318 return (0);
319 }
320
321 /* List the fingerprints */
322 void
pfctl_show_fingerprints(int opts)323 pfctl_show_fingerprints(int opts)
324 {
325 if (LIST_FIRST(&classes) != NULL) {
326 if (opts & PF_OPT_SHOWALL) {
327 pfctl_print_title("OS FINGERPRINTS:");
328 printf("%u fingerprints loaded\n", fingerprint_count);
329 } else {
330 printf("Class\tVersion\tSubtype(subversion)\n");
331 printf("-----\t-------\t-------------------\n");
332 sort_name_list(opts, &classes);
333 print_name_list(opts, &classes, "");
334 }
335 }
336 }
337
338 /* Lookup a fingerprint */
339 pf_osfp_t
pfctl_get_fingerprint(const char * name)340 pfctl_get_fingerprint(const char *name)
341 {
342 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
343 pf_osfp_t ret = PF_OSFP_NOMATCH;
344 int class, version, subtype;
345 int unp_class, unp_version, unp_subtype;
346 int wr_len, version_len, subtype_len;
347 char *ptr, *wr_name;
348
349 if (strcasecmp(name, "unknown") == 0)
350 return (PF_OSFP_UNKNOWN);
351
352 /* Try most likely no version and no subtype */
353 if ((nm = lookup_name_list(&classes, name))) {
354 class = nm->nm_num;
355 version = PF_OSFP_ANY;
356 subtype = PF_OSFP_ANY;
357 goto found;
358 } else {
359
360 /* Chop it up into class/version/subtype */
361
362 if ((wr_name = strdup(name)) == NULL)
363 err(1, "malloc");
364 if ((ptr = strchr(wr_name, ' ')) == NULL) {
365 free(wr_name);
366 return (PF_OSFP_NOMATCH);
367 }
368 *ptr++ = '\0';
369
370 /* The class is easy to find since it is delimited by a space */
371 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
372 free(wr_name);
373 return (PF_OSFP_NOMATCH);
374 }
375 class = class_nm->nm_num;
376
377 /* Try no subtype */
378 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
379 {
380 version = version_nm->nm_num;
381 subtype = PF_OSFP_ANY;
382 free(wr_name);
383 goto found;
384 }
385
386
387 /*
388 * There must be a version and a subtype.
389 * We'll do some fuzzy matching to pick up things like:
390 * Linux 2.2.14 (version=2.2 subtype=14)
391 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
392 * Windows 2000 SP2 (version=2000 subtype=SP2)
393 */
394 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
395 wr_len = strlen(ptr);
396 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
397 version_len = strlen(version_nm->nm_name);
398 if (wr_len < version_len + 2 ||
399 !CONNECTOR(ptr[version_len]))
400 continue;
401 /* first part of the string must be version */
402 if (strncasecmp(ptr, version_nm->nm_name,
403 version_len))
404 continue;
405
406 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
407 nm_entry) {
408 subtype_len = strlen(subtype_nm->nm_name);
409 if (wr_len != version_len + subtype_len + 1)
410 continue;
411
412 /* last part of the string must be subtype */
413 if (strcasecmp(&ptr[version_len+1],
414 subtype_nm->nm_name) != 0)
415 continue;
416
417 /* Found it!! */
418 version = version_nm->nm_num;
419 subtype = subtype_nm->nm_num;
420 free(wr_name);
421 goto found;
422 }
423 }
424
425 free(wr_name);
426 return (PF_OSFP_NOMATCH);
427 }
428
429 found:
430 PF_OSFP_PACK(ret, class, version, subtype);
431 if (ret != PF_OSFP_NOMATCH) {
432 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
433 if (class != unp_class) {
434 fprintf(stderr, "warning: fingerprint table overflowed "
435 "classes\n");
436 return (PF_OSFP_NOMATCH);
437 }
438 if (version != unp_version) {
439 fprintf(stderr, "warning: fingerprint table overflowed "
440 "versions\n");
441 return (PF_OSFP_NOMATCH);
442 }
443 if (subtype != unp_subtype) {
444 fprintf(stderr, "warning: fingerprint table overflowed "
445 "subtypes\n");
446 return (PF_OSFP_NOMATCH);
447 }
448 }
449 if (ret == PF_OSFP_ANY) {
450 /* should never happen */
451 fprintf(stderr, "warning: fingerprint packed to 'any'\n");
452 return (PF_OSFP_NOMATCH);
453 }
454
455 return (ret);
456 }
457
458 /* Lookup a fingerprint name by ID */
459 char *
pfctl_lookup_fingerprint(pf_osfp_t fp,char * buf,size_t len)460 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
461 {
462 int class, version, subtype;
463 struct name_list *list;
464 struct name_entry *nm;
465
466 char *class_name, *version_name, *subtype_name;
467 class_name = version_name = subtype_name = NULL;
468
469 if (fp == PF_OSFP_UNKNOWN) {
470 strlcpy(buf, "unknown", len);
471 return (buf);
472 }
473 if (fp == PF_OSFP_ANY) {
474 strlcpy(buf, "any", len);
475 return (buf);
476 }
477
478 PF_OSFP_UNPACK(fp, class, version, subtype);
479 if (class >= (1 << _FP_CLASS_BITS) ||
480 version >= (1 << _FP_VERSION_BITS) ||
481 subtype >= (1 << _FP_SUBTYPE_BITS)) {
482 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
483 strlcpy(buf, "nomatch", len);
484 return (buf);
485 }
486
487 LIST_FOREACH(nm, &classes, nm_entry) {
488 if (nm->nm_num == class) {
489 class_name = nm->nm_name;
490 if (version == PF_OSFP_ANY)
491 goto found;
492 list = &nm->nm_sublist;
493 LIST_FOREACH(nm, list, nm_entry) {
494 if (nm->nm_num == version) {
495 version_name = nm->nm_name;
496 if (subtype == PF_OSFP_ANY)
497 goto found;
498 list = &nm->nm_sublist;
499 LIST_FOREACH(nm, list, nm_entry) {
500 if (nm->nm_num == subtype) {
501 subtype_name =
502 nm->nm_name;
503 goto found;
504 }
505 } /* foreach subtype */
506 strlcpy(buf, "nomatch", len);
507 return (buf);
508 }
509 } /* foreach version */
510 strlcpy(buf, "nomatch", len);
511 return (buf);
512 }
513 } /* foreach class */
514
515 strlcpy(buf, "nomatch", len);
516 return (buf);
517
518 found:
519 snprintf(buf, len, "%s", class_name);
520 if (version_name) {
521 strlcat(buf, " ", len);
522 strlcat(buf, version_name, len);
523 if (subtype_name) {
524 if (strchr(version_name, ' '))
525 strlcat(buf, " ", len);
526 else if (strchr(version_name, '.') &&
527 isdigit(*subtype_name))
528 strlcat(buf, ".", len);
529 else
530 strlcat(buf, " ", len);
531 strlcat(buf, subtype_name, len);
532 }
533 }
534 return (buf);
535 }
536
537 /* lookup a name in a list */
538 struct name_entry *
lookup_name_list(struct name_list * list,const char * name)539 lookup_name_list(struct name_list *list, const char *name)
540 {
541 struct name_entry *nm;
542 LIST_FOREACH(nm, list, nm_entry)
543 if (strcasecmp(name, nm->nm_name) == 0)
544 return (nm);
545
546 return (NULL);
547 }
548
549
550 void
add_fingerprint(int dev,int opts,struct pf_osfp_ioctl * fp)551 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
552 {
553 struct pf_osfp_ioctl fptmp;
554 struct name_entry *nm_class, *nm_version, *nm_subtype;
555 int class, version, subtype;
556
557 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
558 #define EXPAND(field) do { \
559 int _dot = -1, _start = -1, _end = -1, _i = 0; \
560 /* pick major version out of #.# */ \
561 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \
562 _dot = fp->field[_i] - '0'; \
563 _i += 2; \
564 } \
565 if (isdigit(fp->field[_i])) \
566 _start = fp->field[_i++] - '0'; \
567 else \
568 break; \
569 if (isdigit(fp->field[_i])) \
570 _start = (_start * 10) + fp->field[_i++] - '0'; \
571 if (fp->field[_i++] != '-') \
572 break; \
573 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \
574 fp->field[_i] - '0' == _dot) \
575 _i += 2; \
576 else if (_dot != -1) \
577 break; \
578 if (isdigit(fp->field[_i])) \
579 _end = fp->field[_i++] - '0'; \
580 else \
581 break; \
582 if (isdigit(fp->field[_i])) \
583 _end = (_end * 10) + fp->field[_i++] - '0'; \
584 if (isdigit(fp->field[_i])) \
585 _end = (_end * 10) + fp->field[_i++] - '0'; \
586 if (fp->field[_i] != '\0') \
587 break; \
588 memcpy(&fptmp, fp, sizeof(fptmp)); \
589 for (;_start <= _end; _start++) { \
590 memset(fptmp.field, 0, sizeof(fptmp.field)); \
591 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
592 if (_dot == -1) \
593 snprintf(fptmp.field, sizeof(fptmp.field), \
594 "%d", _start); \
595 else \
596 snprintf(fptmp.field, sizeof(fptmp.field), \
597 "%d.%d", _dot, _start); \
598 add_fingerprint(dev, opts, &fptmp); \
599 } \
600 } while(0)
601
602 /* We allow "#-#" as a version or subtype and we'll expand it */
603 EXPAND(fp_os.fp_version_nm);
604 EXPAND(fp_os.fp_subtype_nm);
605
606 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
607 errx(1, "fingerprint class \"nomatch\" is reserved");
608
609 version = PF_OSFP_ANY;
610 subtype = PF_OSFP_ANY;
611
612 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
613 if (nm_class->nm_num == 0)
614 nm_class->nm_num = ++class_count;
615 class = nm_class->nm_num;
616
617 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
618 fp->fp_os.fp_version_nm);
619 if (nm_version) {
620 if (nm_version->nm_num == 0)
621 nm_version->nm_num = ++nm_class->nm_sublist_num;
622 version = nm_version->nm_num;
623 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
624 fp->fp_os.fp_subtype_nm);
625 if (nm_subtype) {
626 if (nm_subtype->nm_num == 0)
627 nm_subtype->nm_num =
628 ++nm_version->nm_sublist_num;
629 subtype = nm_subtype->nm_num;
630 }
631 }
632
633
634 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
635 print_ioctl(fp));
636
637 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
638 fingerprint_count++;
639
640 #ifdef FAKE_PF_KERNEL
641 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
642 if ((errno = pf_osfp_add(fp)))
643 #else
644 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
645 #endif /* FAKE_PF_KERNEL */
646 {
647 if (errno == EEXIST) {
648 warn("Duplicate signature for %s %s %s",
649 fp->fp_os.fp_class_nm,
650 fp->fp_os.fp_version_nm,
651 fp->fp_os.fp_subtype_nm);
652
653 } else {
654 err(1, "DIOCOSFPADD");
655 }
656 }
657 }
658
659 /* import a fingerprint from the kernel */
660 void
import_fingerprint(struct pf_osfp_ioctl * fp)661 import_fingerprint(struct pf_osfp_ioctl *fp)
662 {
663 struct name_entry *nm_class, *nm_version, *nm_subtype;
664 int class, version, subtype;
665
666 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
667
668 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
669 if (nm_class->nm_num == 0) {
670 nm_class->nm_num = class;
671 class_count = MAX(class_count, class);
672 }
673
674 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
675 fp->fp_os.fp_version_nm);
676 if (nm_version) {
677 if (nm_version->nm_num == 0) {
678 nm_version->nm_num = version;
679 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
680 version);
681 }
682 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
683 fp->fp_os.fp_subtype_nm);
684 if (nm_subtype) {
685 if (nm_subtype->nm_num == 0) {
686 nm_subtype->nm_num = subtype;
687 nm_version->nm_sublist_num =
688 MAX(nm_version->nm_sublist_num, subtype);
689 }
690 }
691 }
692
693
694 fingerprint_count++;
695 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
696 }
697
698 /* Find an entry for a fingerprints class/version/subtype */
699 struct name_entry *
fingerprint_name_entry(struct name_list * list,char * name)700 fingerprint_name_entry(struct name_list *list, char *name)
701 {
702 struct name_entry *nm_entry;
703
704 if (name == NULL || strlen(name) == 0)
705 return (NULL);
706
707 LIST_FOREACH(nm_entry, list, nm_entry) {
708 if (strcasecmp(nm_entry->nm_name, name) == 0) {
709 /* We'll move this to the front of the list later */
710 LIST_REMOVE(nm_entry, nm_entry);
711 break;
712 }
713 }
714 if (nm_entry == NULL) {
715 nm_entry = calloc(1, sizeof(*nm_entry));
716 if (nm_entry == NULL)
717 err(1, "calloc");
718 LIST_INIT(&nm_entry->nm_sublist);
719 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
720 }
721 LIST_INSERT_HEAD(list, nm_entry, nm_entry);
722 return (nm_entry);
723 }
724
725
726 void
print_name_list(int opts,struct name_list * nml,const char * prefix)727 print_name_list(int opts, struct name_list *nml, const char *prefix)
728 {
729 char newprefix[32];
730 struct name_entry *nm;
731
732 LIST_FOREACH(nm, nml, nm_entry) {
733 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
734 nm->nm_name);
735 printf("%s\n", newprefix);
736 print_name_list(opts, &nm->nm_sublist, newprefix);
737 }
738 }
739
740 void
sort_name_list(int opts,struct name_list * nml)741 sort_name_list(int opts, struct name_list *nml)
742 {
743 struct name_list new;
744 struct name_entry *nm, *nmsearch, *nmlast;
745
746 /* yes yes, it's a very slow sort. so sue me */
747
748 LIST_INIT(&new);
749
750 while ((nm = LIST_FIRST(nml)) != NULL) {
751 LIST_REMOVE(nm, nm_entry);
752 nmlast = NULL;
753 LIST_FOREACH(nmsearch, &new, nm_entry) {
754 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
755 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
756 break;
757 }
758 nmlast = nmsearch;
759 }
760 if (nmsearch == NULL) {
761 if (nmlast)
762 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
763 else
764 LIST_INSERT_HEAD(&new, nm, nm_entry);
765 }
766
767 sort_name_list(opts, &nm->nm_sublist);
768 }
769 nmlast = NULL;
770 while ((nm = LIST_FIRST(&new)) != NULL) {
771 LIST_REMOVE(nm, nm_entry);
772 if (nmlast == NULL)
773 LIST_INSERT_HEAD(nml, nm, nm_entry);
774 else
775 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
776 nmlast = nm;
777 }
778 }
779
780 /* parse the next integer in a formatted config file line */
781 int
get_int(char ** line,size_t * len,int * var,int * mod,const char * name,int flags,int max,const char * filename,int lineno)782 get_int(char **line, size_t *len, int *var, int *mod,
783 const char *name, int flags, int max, const char *filename, int lineno)
784 {
785 int fieldlen, i;
786 char *field;
787 long val = 0;
788
789 if (mod)
790 *mod = 0;
791 *var = 0;
792
793 field = get_field(line, len, &fieldlen);
794 if (field == NULL)
795 return (1);
796 if (fieldlen == 0) {
797 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
798 return (1);
799 }
800
801 i = 0;
802 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
803 && fieldlen >= 1) {
804 switch (*field) {
805 case 'S':
806 if (mod && (flags & T_MSS))
807 *mod = T_MSS;
808 if (fieldlen == 1)
809 return (0);
810 break;
811 case 'T':
812 if (mod && (flags & T_MTU))
813 *mod = T_MTU;
814 if (fieldlen == 1)
815 return (0);
816 break;
817 case '*':
818 if (fieldlen != 1) {
819 fprintf(stderr, "%s:%d long '%c' %s\n",
820 filename, lineno, *field, name);
821 return (1);
822 }
823 if (mod && (flags & T_DC)) {
824 *mod = T_DC;
825 return (0);
826 }
827 case '%':
828 if (mod && (flags & T_MOD))
829 *mod = T_MOD;
830 if (fieldlen == 1) {
831 fprintf(stderr, "%s:%d modulus %s must have a "
832 "value\n", filename, lineno, name);
833 return (1);
834 }
835 break;
836 }
837 if (mod == NULL || *mod == 0) {
838 fprintf(stderr, "%s:%d does not allow %c' %s\n",
839 filename, lineno, *field, name);
840 return (1);
841 }
842 i++;
843 }
844
845 for (; i < fieldlen; i++) {
846 if (field[i] < '0' || field[i] > '9') {
847 fprintf(stderr, "%s:%d non-digit character in %s\n",
848 filename, lineno, name);
849 return (1);
850 }
851 val = val * 10 + field[i] - '0';
852 if (val < 0) {
853 fprintf(stderr, "%s:%d %s overflowed\n", filename,
854 lineno, name);
855 return (1);
856 }
857 }
858
859 if (val > max) {
860 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
861 name, val, max);
862 return (1);
863 }
864 *var = (int)val;
865
866 return (0);
867 }
868
869 /* parse the next string in a formatted config file line */
870 int
get_str(char ** line,size_t * len,char ** v,const char * name,int minlen,const char * filename,int lineno)871 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
872 const char *filename, int lineno)
873 {
874 int fieldlen;
875 char *ptr;
876
877 ptr = get_field(line, len, &fieldlen);
878 if (ptr == NULL)
879 return (1);
880 if (fieldlen < minlen) {
881 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
882 return (1);
883 }
884 if ((*v = malloc(fieldlen + 1)) == NULL) {
885 perror("malloc()");
886 return (1);
887 }
888 memcpy(*v, ptr, fieldlen);
889 (*v)[fieldlen] = '\0';
890
891 return (0);
892 }
893
894 /* Parse out the TCP opts */
895 int
get_tcpopts(const char * filename,int lineno,const char * tcpopts,pf_tcpopts_t * packed,int * optcnt,int * mss,int * mss_mod,int * wscale,int * wscale_mod,int * ts0)896 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
897 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
898 int *wscale_mod, int *ts0)
899 {
900 int i, opt;
901
902 *packed = 0;
903 *optcnt = 0;
904 *wscale = 0;
905 *wscale_mod = T_DC;
906 *mss = 0;
907 *mss_mod = T_DC;
908 *ts0 = 0;
909 if (strcmp(tcpopts, ".") == 0)
910 return (0);
911
912 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
913 switch ((opt = toupper(tcpopts[i++]))) {
914 case 'N': /* FALLTHROUGH */
915 case 'S':
916 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
917 (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
918 PF_OSFP_TCPOPT_SACK);
919 break;
920 case 'W': /* FALLTHROUGH */
921 case 'M': {
922 int *this_mod, *this;
923
924 if (opt == 'W') {
925 this = wscale;
926 this_mod = wscale_mod;
927 } else {
928 this = mss;
929 this_mod = mss_mod;
930 }
931 *this = 0;
932 *this_mod = 0;
933
934 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
935 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
936 PF_OSFP_TCPOPT_MSS);
937 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
938 tcpopts[i + 1] == ',')) {
939 *this_mod = T_DC;
940 i++;
941 break;
942 }
943
944 if (tcpopts[i] == '%') {
945 *this_mod = T_MOD;
946 i++;
947 }
948 do {
949 if (!isdigit(tcpopts[i])) {
950 fprintf(stderr, "%s:%d unknown "
951 "character '%c' in %c TCP opt\n",
952 filename, lineno, tcpopts[i], opt);
953 return (1);
954 }
955 *this = (*this * 10) + tcpopts[i++] - '0';
956 } while(tcpopts[i] != ',' && tcpopts[i] != '\0');
957 break;
958 }
959 case 'T':
960 if (tcpopts[i] == '0') {
961 *ts0 = 1;
962 i++;
963 }
964 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
965 PF_OSFP_TCPOPT_TS;
966 break;
967 }
968 (*optcnt) ++;
969 if (tcpopts[i] == '\0')
970 break;
971 if (tcpopts[i] != ',') {
972 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
973 filename, lineno, opt);
974 return (1);
975 }
976 i++;
977 }
978
979 return (0);
980 }
981
982 /* rip the next field ouf of a formatted config file line */
983 char *
get_field(char ** line,size_t * len,int * fieldlen)984 get_field(char **line, size_t *len, int *fieldlen)
985 {
986 char *ret, *ptr = *line;
987 size_t plen = *len;
988
989
990 while (plen && isspace(*ptr)) {
991 plen--;
992 ptr++;
993 }
994 ret = ptr;
995 *fieldlen = 0;
996
997 for (; plen > 0 && *ptr != ':'; plen--, ptr++)
998 (*fieldlen)++;
999 if (plen) {
1000 *line = ptr + 1;
1001 *len = plen - 1;
1002 } else {
1003 *len = 0;
1004 }
1005 while (*fieldlen && isspace(ret[*fieldlen - 1]))
1006 (*fieldlen)--;
1007 return (ret);
1008 }
1009
1010
1011 const char *
print_ioctl(struct pf_osfp_ioctl * fp)1012 print_ioctl(struct pf_osfp_ioctl *fp)
1013 {
1014 static char buf[1024];
1015 char tmp[32];
1016 int i, opt;
1017
1018 *buf = '\0';
1019 if (fp->fp_flags & PF_OSFP_WSIZE_DC)
1020 strlcat(buf, "*", sizeof(buf));
1021 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
1022 strlcat(buf, "S", sizeof(buf));
1023 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
1024 strlcat(buf, "T", sizeof(buf));
1025 else {
1026 if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
1027 strlcat(buf, "%", sizeof(buf));
1028 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
1029 strlcat(buf, tmp, sizeof(buf));
1030 }
1031 strlcat(buf, ":", sizeof(buf));
1032
1033 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
1034 strlcat(buf, tmp, sizeof(buf));
1035 strlcat(buf, ":", sizeof(buf));
1036
1037 if (fp->fp_flags & PF_OSFP_DF)
1038 strlcat(buf, "1", sizeof(buf));
1039 else
1040 strlcat(buf, "0", sizeof(buf));
1041 strlcat(buf, ":", sizeof(buf));
1042
1043 if (fp->fp_flags & PF_OSFP_PSIZE_DC)
1044 strlcat(buf, "*", sizeof(buf));
1045 else {
1046 if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
1047 strlcat(buf, "%", sizeof(buf));
1048 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
1049 strlcat(buf, tmp, sizeof(buf));
1050 }
1051 strlcat(buf, ":", sizeof(buf));
1052
1053 if (fp->fp_optcnt == 0)
1054 strlcat(buf, ".", sizeof(buf));
1055 for (i = fp->fp_optcnt - 1; i >= 0; i--) {
1056 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
1057 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
1058 switch (opt) {
1059 case PF_OSFP_TCPOPT_NOP:
1060 strlcat(buf, "N", sizeof(buf));
1061 break;
1062 case PF_OSFP_TCPOPT_SACK:
1063 strlcat(buf, "S", sizeof(buf));
1064 break;
1065 case PF_OSFP_TCPOPT_TS:
1066 strlcat(buf, "T", sizeof(buf));
1067 if (fp->fp_flags & PF_OSFP_TS0)
1068 strlcat(buf, "0", sizeof(buf));
1069 break;
1070 case PF_OSFP_TCPOPT_MSS:
1071 strlcat(buf, "M", sizeof(buf));
1072 if (fp->fp_flags & PF_OSFP_MSS_DC)
1073 strlcat(buf, "*", sizeof(buf));
1074 else {
1075 if (fp->fp_flags & PF_OSFP_MSS_MOD)
1076 strlcat(buf, "%", sizeof(buf));
1077 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
1078 strlcat(buf, tmp, sizeof(buf));
1079 }
1080 break;
1081 case PF_OSFP_TCPOPT_WSCALE:
1082 strlcat(buf, "W", sizeof(buf));
1083 if (fp->fp_flags & PF_OSFP_WSCALE_DC)
1084 strlcat(buf, "*", sizeof(buf));
1085 else {
1086 if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
1087 strlcat(buf, "%", sizeof(buf));
1088 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
1089 strlcat(buf, tmp, sizeof(buf));
1090 }
1091 break;
1092 }
1093
1094 if (i != 0)
1095 strlcat(buf, ",", sizeof(buf));
1096 }
1097 strlcat(buf, ":", sizeof(buf));
1098
1099 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
1100 strlcat(buf, ":", sizeof(buf));
1101 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
1102 strlcat(buf, ":", sizeof(buf));
1103 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
1104 strlcat(buf, ":", sizeof(buf));
1105
1106 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
1107 (long long int)fp->fp_tcpopts);
1108 strlcat(buf, tmp, sizeof(buf));
1109
1110 return (buf);
1111 }
1112