1 /* $OpenBSD: pfctl_osfp.c,v 1.27 2020/01/15 11:52:50 sashan 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 "pfctl_parser.h"
37 #include "pfctl.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(char **, size_t *, int *);
69 int get_int(char **, size_t *, int *, int *, const char *,
70 int, int, const char *, int);
71 int get_str(char **, size_t *, char **, const char *, int,
72 const char *, int);
73 int get_tcpopts(const char *, int, const 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
pfctl_file_fingerprints(int dev,int opts,const char * fp_filename)86 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
87 {
88 FILE *in;
89 char *line;
90 size_t len;
91 int i, 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 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) {
101 warn("%s", fp_filename);
102 return (1);
103 }
104 class = version = subtype = desc = tcpopts = NULL;
105
106 if ((opts & PF_OPT_NOACTION) == 0)
107 pfctl_clear_fingerprints(dev, opts);
108
109 while ((line = fgetln(in, &len)) != NULL) {
110 lineno++;
111 free(class);
112 free(version);
113 free(subtype);
114 free(desc);
115 free(tcpopts);
116 class = version = subtype = desc = tcpopts = NULL;
117 memset(&fp, 0, sizeof(fp));
118
119 /* Chop off comment */
120 for (i = 0; i < len; i++)
121 if (line[i] == '#') {
122 len = i;
123 break;
124 }
125 /* Chop off whitespace */
126 while (len > 0 && isspace((unsigned char)line[len - 1]))
127 len--;
128 while (len > 0 && isspace((unsigned char)line[0])) {
129 len--;
130 line++;
131 }
132 if (len == 0)
133 continue;
134
135 #define T_DC 0x01 /* Allow don't care */
136 #define T_MSS 0x02 /* Allow MSS multiple */
137 #define T_MTU 0x04 /* Allow MTU multiple */
138 #define T_MOD 0x08 /* Allow modulus */
139
140 #define GET_INT(v, mod, n, ty, mx) \
141 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
142 #define GET_STR(v, n, mn) \
143 get_str(&line, &len, &v, n, mn, fp_filename, lineno)
144
145 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
146 T_MOD, 0xffff) ||
147 GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
148 GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
149 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
150 8192) ||
151 GET_STR(tcpopts, "TCP Options", 1) ||
152 GET_STR(class, "OS class", 1) ||
153 GET_STR(version, "OS version", 0) ||
154 GET_STR(subtype, "OS subtype", 0) ||
155 GET_STR(desc, "OS description", 2))
156 continue;
157 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
158 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
159 continue;
160 if (len != 0) {
161 fprintf(stderr, "%s:%d excess field\n", fp_filename,
162 lineno);
163 continue;
164 }
165
166 fp.fp_ttl = ttl;
167 if (df)
168 fp.fp_flags |= PF_OSFP_DF;
169 switch (w_mod) {
170 case 0:
171 break;
172 case T_DC:
173 fp.fp_flags |= PF_OSFP_WSIZE_DC;
174 break;
175 case T_MSS:
176 fp.fp_flags |= PF_OSFP_WSIZE_MSS;
177 break;
178 case T_MTU:
179 fp.fp_flags |= PF_OSFP_WSIZE_MTU;
180 break;
181 case T_MOD:
182 fp.fp_flags |= PF_OSFP_WSIZE_MOD;
183 break;
184 }
185 fp.fp_wsize = window;
186
187 switch (p_mod) {
188 case T_DC:
189 fp.fp_flags |= PF_OSFP_PSIZE_DC;
190 break;
191 case T_MOD:
192 fp.fp_flags |= PF_OSFP_PSIZE_MOD;
193 }
194 fp.fp_psize = psize;
195
196
197 switch (wscale_mod) {
198 case T_DC:
199 fp.fp_flags |= PF_OSFP_WSCALE_DC;
200 break;
201 case T_MOD:
202 fp.fp_flags |= PF_OSFP_WSCALE_MOD;
203 }
204 fp.fp_wscale = wscale;
205
206 switch (mss_mod) {
207 case T_DC:
208 fp.fp_flags |= PF_OSFP_MSS_DC;
209 break;
210 case T_MOD:
211 fp.fp_flags |= PF_OSFP_MSS_MOD;
212 break;
213 }
214 fp.fp_mss = mss;
215
216 fp.fp_tcpopts = packed_tcpopts;
217 fp.fp_optcnt = optcnt;
218 if (ts0)
219 fp.fp_flags |= PF_OSFP_TS0;
220
221 if (class[0] == '@')
222 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
223 if (class[0] == '*')
224 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
225
226 if (class[0] == '@' || class[0] == '*')
227 strlcpy(fp.fp_os.fp_class_nm, class + 1,
228 sizeof(fp.fp_os.fp_class_nm));
229 else
230 strlcpy(fp.fp_os.fp_class_nm, class,
231 sizeof(fp.fp_os.fp_class_nm));
232 strlcpy(fp.fp_os.fp_version_nm, version,
233 sizeof(fp.fp_os.fp_version_nm));
234 strlcpy(fp.fp_os.fp_subtype_nm, subtype,
235 sizeof(fp.fp_os.fp_subtype_nm));
236
237 add_fingerprint(dev, opts, &fp);
238
239 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6);
240 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip);
241 add_fingerprint(dev, opts, &fp);
242 }
243
244 free(class);
245 free(version);
246 free(subtype);
247 free(desc);
248 free(tcpopts);
249
250 fclose(in);
251
252 if (opts & PF_OPT_VERBOSE2)
253 printf("Loaded %d passive OS fingerprints\n",
254 fingerprint_count);
255 return (0);
256 }
257
258 /* flush the kernel's fingerprints */
259 void
pfctl_clear_fingerprints(int dev,int opts)260 pfctl_clear_fingerprints(int dev, int opts)
261 {
262 if (ioctl(dev, DIOCOSFPFLUSH) == -1)
263 pfctl_err(opts, 1, "DIOCOSFPFLUSH");
264 }
265
266 /* flush pfctl's view of the fingerprints */
267 void
pfctl_flush_my_fingerprints(struct name_list * list)268 pfctl_flush_my_fingerprints(struct name_list *list)
269 {
270 struct name_entry *nm;
271
272 while ((nm = LIST_FIRST(list)) != NULL) {
273 LIST_REMOVE(nm, nm_entry);
274 pfctl_flush_my_fingerprints(&nm->nm_sublist);
275 free(nm);
276 }
277 fingerprint_count = 0;
278 class_count = 0;
279 }
280
281 /* Fetch the active fingerprints from the kernel */
282 int
pfctl_load_fingerprints(int dev,int opts)283 pfctl_load_fingerprints(int dev, int opts)
284 {
285 struct pf_osfp_ioctl io;
286 int i;
287
288 pfctl_flush_my_fingerprints(&classes);
289
290 for (i = 0; i >= 0; i++) {
291 memset(&io, 0, sizeof(io));
292 io.fp_getnum = i;
293 if (ioctl(dev, DIOCOSFPGET, &io) == -1) {
294 if (errno == EBUSY)
295 break;
296 warn("DIOCOSFPGET");
297 return (1);
298 }
299 import_fingerprint(&io);
300 }
301 return (0);
302 }
303
304 /* List the fingerprints */
305 void
pfctl_show_fingerprints(int opts)306 pfctl_show_fingerprints(int opts)
307 {
308 if (LIST_FIRST(&classes) != NULL) {
309 if (opts & PF_OPT_SHOWALL) {
310 pfctl_print_title("OS FINGERPRINTS:");
311 printf("%u fingerprints loaded\n", fingerprint_count);
312 } else {
313 printf("Class\tVersion\tSubtype(subversion)\n");
314 printf("-----\t-------\t-------------------\n");
315 sort_name_list(opts, &classes);
316 print_name_list(opts, &classes, "");
317 }
318 }
319 }
320
321 /* Lookup a fingerprint */
322 pf_osfp_t
pfctl_get_fingerprint(const char * name)323 pfctl_get_fingerprint(const char *name)
324 {
325 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
326 pf_osfp_t ret = PF_OSFP_NOMATCH;
327 int class, version, subtype;
328 int unp_class, unp_version, unp_subtype;
329 int wr_len, version_len, subtype_len;
330 char *ptr, *wr_name;
331
332 if (strcasecmp(name, "unknown") == 0)
333 return (PF_OSFP_UNKNOWN);
334
335 /* Try most likely no version and no subtype */
336 if ((nm = lookup_name_list(&classes, name))) {
337 class = nm->nm_num;
338 version = PF_OSFP_ANY;
339 subtype = PF_OSFP_ANY;
340 goto found;
341 } else {
342
343 /* Chop it up into class/version/subtype */
344
345 if ((wr_name = strdup(name)) == NULL)
346 err(1, "malloc");
347 if ((ptr = strchr(wr_name, ' ')) == NULL) {
348 free(wr_name);
349 return (PF_OSFP_NOMATCH);
350 }
351 *ptr++ = '\0';
352
353 /* The class is easy to find since it is delimited by a space */
354 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
355 free(wr_name);
356 return (PF_OSFP_NOMATCH);
357 }
358 class = class_nm->nm_num;
359
360 /* Try no subtype */
361 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
362 {
363 version = version_nm->nm_num;
364 subtype = PF_OSFP_ANY;
365 free(wr_name);
366 goto found;
367 }
368
369
370 /*
371 * There must be a version and a subtype.
372 * We'll do some fuzzy matching to pick up things like:
373 * Linux 2.2.14 (version=2.2 subtype=14)
374 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
375 * Windows 2000 SP2 (version=2000 subtype=SP2)
376 */
377 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
378 wr_len = strlen(ptr);
379 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
380 version_len = strlen(version_nm->nm_name);
381 if (wr_len < version_len + 2 ||
382 !CONNECTOR(ptr[version_len]))
383 continue;
384 /* first part of the string must be version */
385 if (strncasecmp(ptr, version_nm->nm_name,
386 version_len))
387 continue;
388
389 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
390 nm_entry) {
391 subtype_len = strlen(subtype_nm->nm_name);
392 if (wr_len != version_len + subtype_len + 1)
393 continue;
394
395 /* last part of the string must be subtype */
396 if (strcasecmp(&ptr[version_len+1],
397 subtype_nm->nm_name) != 0)
398 continue;
399
400 /* Found it!! */
401 version = version_nm->nm_num;
402 subtype = subtype_nm->nm_num;
403 free(wr_name);
404 goto found;
405 }
406 }
407
408 free(wr_name);
409 return (PF_OSFP_NOMATCH);
410 }
411
412 found:
413 PF_OSFP_PACK(ret, class, version, subtype);
414 if (ret != PF_OSFP_NOMATCH) {
415 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
416 if (class != unp_class) {
417 fprintf(stderr, "warning: fingerprint table overflowed "
418 "classes\n");
419 return (PF_OSFP_NOMATCH);
420 }
421 if (version != unp_version) {
422 fprintf(stderr, "warning: fingerprint table overflowed "
423 "versions\n");
424 return (PF_OSFP_NOMATCH);
425 }
426 if (subtype != unp_subtype) {
427 fprintf(stderr, "warning: fingerprint table overflowed "
428 "subtypes\n");
429 return (PF_OSFP_NOMATCH);
430 }
431 }
432 if (ret == PF_OSFP_ANY) {
433 /* should never happen */
434 fprintf(stderr, "warning: fingerprint packed to 'any'\n");
435 return (PF_OSFP_NOMATCH);
436 }
437
438 return (ret);
439 }
440
441 /* Lookup a fingerprint name by ID */
442 char *
pfctl_lookup_fingerprint(pf_osfp_t fp,char * buf,size_t len)443 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
444 {
445 int class, version, subtype;
446 struct name_list *list;
447 struct name_entry *nm;
448
449 char *class_name, *version_name, *subtype_name;
450 class_name = version_name = subtype_name = NULL;
451
452 if (fp == PF_OSFP_UNKNOWN) {
453 strlcpy(buf, "unknown", len);
454 return (buf);
455 }
456 if (fp == PF_OSFP_ANY) {
457 strlcpy(buf, "any", len);
458 return (buf);
459 }
460
461 PF_OSFP_UNPACK(fp, class, version, subtype);
462 if (class >= (1 << _FP_CLASS_BITS) ||
463 version >= (1 << _FP_VERSION_BITS) ||
464 subtype >= (1 << _FP_SUBTYPE_BITS)) {
465 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
466 strlcpy(buf, "nomatch", len);
467 return (buf);
468 }
469
470 LIST_FOREACH(nm, &classes, nm_entry) {
471 if (nm->nm_num == class) {
472 class_name = nm->nm_name;
473 if (version == PF_OSFP_ANY)
474 goto found;
475 list = &nm->nm_sublist;
476 LIST_FOREACH(nm, list, nm_entry) {
477 if (nm->nm_num == version) {
478 version_name = nm->nm_name;
479 if (subtype == PF_OSFP_ANY)
480 goto found;
481 list = &nm->nm_sublist;
482 LIST_FOREACH(nm, list, nm_entry) {
483 if (nm->nm_num == subtype) {
484 subtype_name =
485 nm->nm_name;
486 goto found;
487 }
488 } /* foreach subtype */
489 strlcpy(buf, "nomatch", len);
490 return (buf);
491 }
492 } /* foreach version */
493 strlcpy(buf, "nomatch", len);
494 return (buf);
495 }
496 } /* foreach class */
497
498 strlcpy(buf, "nomatch", len);
499 return (buf);
500
501 found:
502 snprintf(buf, len, "%s", class_name);
503 if (version_name) {
504 strlcat(buf, " ", len);
505 strlcat(buf, version_name, len);
506 if (subtype_name) {
507 if (strchr(version_name, ' '))
508 strlcat(buf, " ", len);
509 else if (strchr(version_name, '.') &&
510 isdigit((unsigned char)*subtype_name))
511 strlcat(buf, ".", len);
512 else
513 strlcat(buf, " ", len);
514 strlcat(buf, subtype_name, len);
515 }
516 }
517 return (buf);
518 }
519
520 /* lookup a name in a list */
521 struct name_entry *
lookup_name_list(struct name_list * list,const char * name)522 lookup_name_list(struct name_list *list, const char *name)
523 {
524 struct name_entry *nm;
525 LIST_FOREACH(nm, list, nm_entry)
526 if (strcasecmp(name, nm->nm_name) == 0)
527 return (nm);
528
529 return (NULL);
530 }
531
532
533 void
add_fingerprint(int dev,int opts,struct pf_osfp_ioctl * fp)534 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
535 {
536 struct pf_osfp_ioctl fptmp;
537 struct name_entry *nm_class, *nm_version, *nm_subtype;
538 int class, version, subtype;
539
540 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
541 #define EXPAND(field) do { \
542 int _dot = -1, _start = -1, _end = -1, _i = 0; \
543 /* pick major version out of #.# */ \
544 if (isdigit((unsigned char)fp->field[_i]) && \
545 fp->field[_i+1] == '.') { \
546 _dot = fp->field[_i] - '0'; \
547 _i += 2; \
548 } \
549 if (isdigit((unsigned char)fp->field[_i])) \
550 _start = fp->field[_i++] - '0'; \
551 else \
552 break; \
553 if (isdigit((unsigned char)fp->field[_i])) \
554 _start = (_start * 10) + fp->field[_i++] - '0'; \
555 if (fp->field[_i++] != '-') \
556 break; \
557 if (isdigit((unsigned char)fp->field[_i]) && \
558 fp->field[_i+1] == '.' && fp->field[_i] - '0' == _dot) \
559 _i += 2; \
560 else if (_dot != -1) \
561 break; \
562 if (isdigit((unsigned char)fp->field[_i])) \
563 _end = fp->field[_i++] - '0'; \
564 else \
565 break; \
566 if (isdigit((unsigned char)fp->field[_i])) \
567 _end = (_end * 10) + fp->field[_i++] - '0'; \
568 if (isdigit((unsigned char)fp->field[_i])) \
569 _end = (_end * 10) + fp->field[_i++] - '0'; \
570 if (fp->field[_i] != '\0') \
571 break; \
572 memcpy(&fptmp, fp, sizeof(fptmp)); \
573 for (;_start <= _end; _start++) { \
574 memset(fptmp.field, 0, sizeof(fptmp.field)); \
575 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
576 if (_dot == -1) \
577 snprintf(fptmp.field, sizeof(fptmp.field), \
578 "%d", _start); \
579 else \
580 snprintf(fptmp.field, sizeof(fptmp.field), \
581 "%d.%d", _dot, _start); \
582 add_fingerprint(dev, opts, &fptmp); \
583 } \
584 } while(0)
585
586 /* We allow "#-#" as a version or subtype and we'll expand it */
587 EXPAND(fp_os.fp_version_nm);
588 EXPAND(fp_os.fp_subtype_nm);
589
590 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
591 errx(1, "fingerprint class \"nomatch\" is reserved");
592
593 version = PF_OSFP_ANY;
594 subtype = PF_OSFP_ANY;
595
596 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
597 if (nm_class->nm_num == 0)
598 nm_class->nm_num = ++class_count;
599 class = nm_class->nm_num;
600
601 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
602 fp->fp_os.fp_version_nm);
603 if (nm_version) {
604 if (nm_version->nm_num == 0)
605 nm_version->nm_num = ++nm_class->nm_sublist_num;
606 version = nm_version->nm_num;
607 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
608 fp->fp_os.fp_subtype_nm);
609 if (nm_subtype) {
610 if (nm_subtype->nm_num == 0)
611 nm_subtype->nm_num =
612 ++nm_version->nm_sublist_num;
613 subtype = nm_subtype->nm_num;
614 }
615 }
616
617
618 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
619 print_ioctl(fp));
620
621 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
622 fingerprint_count++;
623
624 #ifdef FAKE_PF_KERNEL
625 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
626 if ((errno = pf_osfp_add(fp)))
627 #else
628 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp) == -1)
629 #endif /* FAKE_PF_KERNEL */
630 {
631 if (errno == EEXIST) {
632 warn("Duplicate signature for %s %s %s",
633 fp->fp_os.fp_class_nm,
634 fp->fp_os.fp_version_nm,
635 fp->fp_os.fp_subtype_nm);
636
637 } else {
638 err(1, "DIOCOSFPADD");
639 }
640 }
641 }
642
643 /* import a fingerprint from the kernel */
644 void
import_fingerprint(struct pf_osfp_ioctl * fp)645 import_fingerprint(struct pf_osfp_ioctl *fp)
646 {
647 struct name_entry *nm_class, *nm_version, *nm_subtype;
648 int class, version, subtype;
649
650 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
651
652 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
653 if (nm_class->nm_num == 0) {
654 nm_class->nm_num = class;
655 class_count = MAXIMUM(class_count, class);
656 }
657
658 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
659 fp->fp_os.fp_version_nm);
660 if (nm_version) {
661 if (nm_version->nm_num == 0) {
662 nm_version->nm_num = version;
663 nm_class->nm_sublist_num = MAXIMUM(nm_class->nm_sublist_num,
664 version);
665 }
666 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
667 fp->fp_os.fp_subtype_nm);
668 if (nm_subtype) {
669 if (nm_subtype->nm_num == 0) {
670 nm_subtype->nm_num = subtype;
671 nm_version->nm_sublist_num =
672 MAXIMUM(nm_version->nm_sublist_num, subtype);
673 }
674 }
675 }
676
677
678 fingerprint_count++;
679 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
680 }
681
682 /* Find an entry for a fingerprints class/version/subtype */
683 struct name_entry *
fingerprint_name_entry(struct name_list * list,char * name)684 fingerprint_name_entry(struct name_list *list, char *name)
685 {
686 struct name_entry *nm_entry;
687
688 if (name == NULL || strlen(name) == 0)
689 return (NULL);
690
691 LIST_FOREACH(nm_entry, list, nm_entry) {
692 if (strcasecmp(nm_entry->nm_name, name) == 0) {
693 /* We'll move this to the front of the list later */
694 LIST_REMOVE(nm_entry, nm_entry);
695 break;
696 }
697 }
698 if (nm_entry == NULL) {
699 nm_entry = calloc(1, sizeof(*nm_entry));
700 if (nm_entry == NULL)
701 err(1, "calloc");
702 LIST_INIT(&nm_entry->nm_sublist);
703 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
704 }
705 LIST_INSERT_HEAD(list, nm_entry, nm_entry);
706 return (nm_entry);
707 }
708
709
710 void
print_name_list(int opts,struct name_list * nml,const char * prefix)711 print_name_list(int opts, struct name_list *nml, const char *prefix)
712 {
713 char newprefix[32];
714 struct name_entry *nm;
715
716 LIST_FOREACH(nm, nml, nm_entry) {
717 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
718 nm->nm_name);
719 printf("%s\n", newprefix);
720 print_name_list(opts, &nm->nm_sublist, newprefix);
721 }
722 }
723
724 void
sort_name_list(int opts,struct name_list * nml)725 sort_name_list(int opts, struct name_list *nml)
726 {
727 struct name_list new;
728 struct name_entry *nm, *nmsearch, *nmlast;
729
730 /* yes yes, it's a very slow sort. so sue me */
731
732 LIST_INIT(&new);
733
734 while ((nm = LIST_FIRST(nml)) != NULL) {
735 LIST_REMOVE(nm, nm_entry);
736 nmlast = NULL;
737 LIST_FOREACH(nmsearch, &new, nm_entry) {
738 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
739 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
740 break;
741 }
742 nmlast = nmsearch;
743 }
744 if (nmsearch == NULL) {
745 if (nmlast)
746 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
747 else
748 LIST_INSERT_HEAD(&new, nm, nm_entry);
749 }
750
751 sort_name_list(opts, &nm->nm_sublist);
752 }
753 nmlast = NULL;
754 while ((nm = LIST_FIRST(&new)) != NULL) {
755 LIST_REMOVE(nm, nm_entry);
756 if (nmlast == NULL)
757 LIST_INSERT_HEAD(nml, nm, nm_entry);
758 else
759 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
760 nmlast = nm;
761 }
762 }
763
764 /* parse the next integer in a formatted config file line */
765 int
get_int(char ** line,size_t * len,int * var,int * mod,const char * name,int flags,int max,const char * filename,int lineno)766 get_int(char **line, size_t *len, int *var, int *mod,
767 const char *name, int flags, int max, const char *filename, int lineno)
768 {
769 int fieldlen, i;
770 char *field;
771 long val = 0;
772
773 if (mod)
774 *mod = 0;
775 *var = 0;
776
777 field = get_field(line, len, &fieldlen);
778 if (field == NULL)
779 return (1);
780 if (fieldlen == 0) {
781 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
782 return (1);
783 }
784
785 i = 0;
786 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
787 && fieldlen >= 1) {
788 switch (*field) {
789 case 'S':
790 if (mod && (flags & T_MSS))
791 *mod = T_MSS;
792 if (fieldlen == 1)
793 return (0);
794 break;
795 case 'T':
796 if (mod && (flags & T_MTU))
797 *mod = T_MTU;
798 if (fieldlen == 1)
799 return (0);
800 break;
801 case '*':
802 if (fieldlen != 1) {
803 fprintf(stderr, "%s:%d long '%c' %s\n",
804 filename, lineno, *field, name);
805 return (1);
806 }
807 if (mod && (flags & T_DC)) {
808 *mod = T_DC;
809 return (0);
810 }
811 case '%':
812 if (mod && (flags & T_MOD))
813 *mod = T_MOD;
814 if (fieldlen == 1) {
815 fprintf(stderr, "%s:%d modulus %s must have a "
816 "value\n", filename, lineno, name);
817 return (1);
818 }
819 break;
820 }
821 if (mod == NULL || *mod == 0) {
822 fprintf(stderr, "%s:%d does not allow %c' %s\n",
823 filename, lineno, *field, name);
824 return (1);
825 }
826 i++;
827 }
828
829 for (; i < fieldlen; i++) {
830 if (field[i] < '0' || field[i] > '9') {
831 fprintf(stderr, "%s:%d non-digit character in %s\n",
832 filename, lineno, name);
833 return (1);
834 }
835 val = val * 10 + field[i] - '0';
836 if (val < 0) {
837 fprintf(stderr, "%s:%d %s overflowed\n", filename,
838 lineno, name);
839 return (1);
840 }
841 }
842
843 if (val > max) {
844 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
845 name, val, max);
846 return (1);
847 }
848 *var = (int)val;
849
850 return (0);
851 }
852
853 /* parse the next string in a formatted config file line */
854 int
get_str(char ** line,size_t * len,char ** v,const char * name,int minlen,const char * filename,int lineno)855 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
856 const char *filename, int lineno)
857 {
858 int fieldlen;
859 char *ptr;
860
861 ptr = get_field(line, len, &fieldlen);
862 if (ptr == NULL)
863 return (1);
864 if (fieldlen < minlen) {
865 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
866 return (1);
867 }
868 if ((*v = malloc(fieldlen + 1)) == NULL) {
869 perror("malloc()");
870 return (1);
871 }
872 memcpy(*v, ptr, fieldlen);
873 (*v)[fieldlen] = '\0';
874
875 return (0);
876 }
877
878 /* Parse out the TCP opts */
879 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)880 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
881 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
882 int *wscale_mod, int *ts0)
883 {
884 int i, opt;
885
886 *packed = 0;
887 *optcnt = 0;
888 *wscale = 0;
889 *wscale_mod = T_DC;
890 *mss = 0;
891 *mss_mod = T_DC;
892 *ts0 = 0;
893 if (strcmp(tcpopts, ".") == 0)
894 return (0);
895
896 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
897 switch ((opt = toupper((unsigned char)tcpopts[i++]))) {
898 case 'N': /* FALLTHROUGH */
899 case 'S':
900 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
901 (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
902 PF_OSFP_TCPOPT_SACK);
903 break;
904 case 'W': /* FALLTHROUGH */
905 case 'M': {
906 int *this_mod, *this;
907
908 if (opt == 'W') {
909 this = wscale;
910 this_mod = wscale_mod;
911 } else {
912 this = mss;
913 this_mod = mss_mod;
914 }
915 *this = 0;
916 *this_mod = 0;
917
918 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
919 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
920 PF_OSFP_TCPOPT_MSS);
921 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
922 tcpopts[i + 1] == ',')) {
923 *this_mod = T_DC;
924 i++;
925 break;
926 }
927
928 if (tcpopts[i] == '%') {
929 *this_mod = T_MOD;
930 i++;
931 }
932 do {
933 if (!isdigit((unsigned char)tcpopts[i])) {
934 fprintf(stderr, "%s:%d unknown "
935 "character '%c' in %c TCP opt\n",
936 filename, lineno, tcpopts[i], opt);
937 return (1);
938 }
939 *this = (*this * 10) + tcpopts[i++] - '0';
940 } while(tcpopts[i] != ',' && tcpopts[i] != '\0');
941 break;
942 }
943 case 'T':
944 if (tcpopts[i] == '0') {
945 *ts0 = 1;
946 i++;
947 }
948 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
949 PF_OSFP_TCPOPT_TS;
950 break;
951 }
952 (*optcnt) ++;
953 if (tcpopts[i] == '\0')
954 break;
955 if (tcpopts[i] != ',') {
956 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
957 filename, lineno, opt);
958 return (1);
959 }
960 i++;
961 }
962
963 return (0);
964 }
965
966 /* rip the next field out of a formatted config file line */
967 char *
get_field(char ** line,size_t * len,int * fieldlen)968 get_field(char **line, size_t *len, int *fieldlen)
969 {
970 char *ret, *ptr = *line;
971 size_t plen = *len;
972
973
974 while (plen && isspace((unsigned char)*ptr)) {
975 plen--;
976 ptr++;
977 }
978 ret = ptr;
979 *fieldlen = 0;
980
981 for (; plen > 0 && *ptr != ':'; plen--, ptr++)
982 (*fieldlen)++;
983 if (plen) {
984 *line = ptr + 1;
985 *len = plen - 1;
986 } else {
987 *len = 0;
988 }
989 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1]))
990 (*fieldlen)--;
991 return (ret);
992 }
993
994
995 #ifdef OSFP_DEBUG
996 const char *
print_ioctl(struct pf_osfp_ioctl * fp)997 print_ioctl(struct pf_osfp_ioctl *fp)
998 {
999 static char buf[1024];
1000 char tmp[32];
1001 int i, opt;
1002
1003 *buf = '\0';
1004 if (fp->fp_flags & PF_OSFP_WSIZE_DC)
1005 strlcat(buf, "*", sizeof(buf));
1006 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
1007 strlcat(buf, "S", sizeof(buf));
1008 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
1009 strlcat(buf, "T", sizeof(buf));
1010 else {
1011 if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
1012 strlcat(buf, "%", sizeof(buf));
1013 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
1014 strlcat(buf, tmp, sizeof(buf));
1015 }
1016 strlcat(buf, ":", sizeof(buf));
1017
1018 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
1019 strlcat(buf, tmp, sizeof(buf));
1020 strlcat(buf, ":", sizeof(buf));
1021
1022 if (fp->fp_flags & PF_OSFP_DF)
1023 strlcat(buf, "1", sizeof(buf));
1024 else
1025 strlcat(buf, "0", sizeof(buf));
1026 strlcat(buf, ":", sizeof(buf));
1027
1028 if (fp->fp_flags & PF_OSFP_PSIZE_DC)
1029 strlcat(buf, "*", sizeof(buf));
1030 else {
1031 if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
1032 strlcat(buf, "%", sizeof(buf));
1033 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
1034 strlcat(buf, tmp, sizeof(buf));
1035 }
1036 strlcat(buf, ":", sizeof(buf));
1037
1038 if (fp->fp_optcnt == 0)
1039 strlcat(buf, ".", sizeof(buf));
1040 for (i = fp->fp_optcnt - 1; i >= 0; i--) {
1041 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
1042 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
1043 switch (opt) {
1044 case PF_OSFP_TCPOPT_NOP:
1045 strlcat(buf, "N", sizeof(buf));
1046 break;
1047 case PF_OSFP_TCPOPT_SACK:
1048 strlcat(buf, "S", sizeof(buf));
1049 break;
1050 case PF_OSFP_TCPOPT_TS:
1051 strlcat(buf, "T", sizeof(buf));
1052 if (fp->fp_flags & PF_OSFP_TS0)
1053 strlcat(buf, "0", sizeof(buf));
1054 break;
1055 case PF_OSFP_TCPOPT_MSS:
1056 strlcat(buf, "M", sizeof(buf));
1057 if (fp->fp_flags & PF_OSFP_MSS_DC)
1058 strlcat(buf, "*", sizeof(buf));
1059 else {
1060 if (fp->fp_flags & PF_OSFP_MSS_MOD)
1061 strlcat(buf, "%", sizeof(buf));
1062 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
1063 strlcat(buf, tmp, sizeof(buf));
1064 }
1065 break;
1066 case PF_OSFP_TCPOPT_WSCALE:
1067 strlcat(buf, "W", sizeof(buf));
1068 if (fp->fp_flags & PF_OSFP_WSCALE_DC)
1069 strlcat(buf, "*", sizeof(buf));
1070 else {
1071 if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
1072 strlcat(buf, "%", sizeof(buf));
1073 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
1074 strlcat(buf, tmp, sizeof(buf));
1075 }
1076 break;
1077 }
1078
1079 if (i != 0)
1080 strlcat(buf, ",", sizeof(buf));
1081 }
1082 strlcat(buf, ":", sizeof(buf));
1083
1084 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
1085 strlcat(buf, ":", sizeof(buf));
1086 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
1087 strlcat(buf, ":", sizeof(buf));
1088 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
1089 strlcat(buf, ":", sizeof(buf));
1090
1091 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
1092 (long long int)fp->fp_tcpopts);
1093 strlcat(buf, tmp, sizeof(buf));
1094
1095 return (buf);
1096 }
1097 #endif
1098