2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002, 2004 Networks Associates Technology, Inc.
7 * This software was developed for the FreeBSD Project by NAI Labs, the
8 * Security Research Division of Network Associates, Inc. under
9 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
10 * CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/types.h>
38 #include <sys/queue.h>
53 struct label_spec_entry {
54 regex_t regex; /* compiled regular expression to match */
55 char *regexstr; /* uncompiled regular expression */
56 mode_t mode; /* mode to possibly match */
57 const char *modestr; /* print-worthy ",-?" mode string */
58 char *mactext; /* MAC label to apply */
59 int flags; /* miscellaneous flags */
60 #define F_DONTLABEL 0x01
61 #define F_ALWAYSMATCH 0x02
62 } *entries, /* entries[0..nentries] */
63 *match; /* cached decision for MAC label to apply */
64 size_t nentries; /* size of entries list */
65 STAILQ_ENTRY(label_spec) link;
69 STAILQ_HEAD(label_specs_head, label_spec) head;
72 void usage(int) __dead2;
73 struct label_specs *new_specs(void);
74 void add_specs(struct label_specs *, const char *, int);
75 void add_setfmac_specs(struct label_specs *, char *);
76 void add_spec_line(const char *, int, struct label_spec_entry *, char *);
77 int apply_specs(struct label_specs *, FTSENT *, int, int);
78 int specs_empty(struct label_specs *);
83 main(int argc, char **argv)
87 struct label_specs *specs;
88 int eflag = 0, xflag = 0, vflag = 0, Rflag = 0, hflag;
92 bn = basename(argv[0]);
95 is_setfmac = strcmp(bn, "setfmac") == 0;
96 hflag = is_setfmac ? FTS_LOGICAL : FTS_PHYSICAL;
98 while ((ch = getopt(argc, argv, is_setfmac ? "Rhq" : "ef:qs:vx")) !=
108 add_specs(specs, optarg, 0);
111 hflag = FTS_PHYSICAL;
117 add_specs(specs, optarg, 1);
135 add_setfmac_specs(specs, *argv);
139 if (argc == 0 || specs_empty(specs))
142 fts = fts_open(argv, hflag | xflag, NULL);
144 err(1, "cannot traverse filesystem%s", argc ? "s" : "");
145 while ((ftsent = fts_read(fts)) != NULL) {
146 switch (ftsent->fts_info) {
147 case FTS_DP: /* skip post-order */
149 case FTS_D: /* do pre-order */
150 case FTS_DC: /* do cyclic? */
151 /* don't ever recurse directories as setfmac(8) */
152 if (is_setfmac && !Rflag)
153 fts_set(fts, ftsent, FTS_SKIP);
154 case FTS_DEFAULT: /* do default */
155 case FTS_F: /* do regular */
156 case FTS_SL: /* do symlink */
157 case FTS_SLNONE: /* do symlink */
158 case FTS_W: /* do whiteout */
159 if (apply_specs(specs, ftsent, hflag, vflag)) {
161 errx(1, "labeling not supported in %s",
165 warnx("labeling not supported in %s",
167 fts_set(fts, ftsent, FTS_SKIP);
170 case FTS_DNR: /* die on all errors */
173 err(1, "traversing %s", ftsent->fts_path);
175 errx(1, "CANNOT HAPPEN (%d) traversing %s",
176 ftsent->fts_info, ftsent->fts_path);
184 usage(int is_setfmac)
188 fprintf(stderr, "usage: setfmac [-Rhq] label file ...\n");
190 fprintf(stderr, "usage: setfsmac [-ehqvx] [-f specfile [...]] [-s specfile [...]] file ...\n");
195 chomp_line(char **line, size_t *linesize)
200 for (s = *line; (unsigned)(s - *line) < *linesize; s++) {
209 memmove(*line, s, *linesize - (s - *line));
210 *linesize -= s - *line;
211 for (s = &(*line)[*linesize - 1]; s >= *line; s--) {
215 if (s != &(*line)[*linesize - 1]) {
216 *linesize = s - *line + 1;
218 s = malloc(*linesize + 1);
221 strncpy(s, *line, *linesize);
225 (*line)[*linesize] = '\0';
230 add_specs(struct label_specs *specs, const char *file, int is_sebsd)
232 struct label_spec *spec;
235 size_t nlines = 0, linesize;
238 spec = malloc(sizeof(*spec));
241 fp = fopen(file, "r");
243 err(1, "opening %s", file);
244 while ((line = fgetln(fp, &linesize)) != NULL) {
245 freeline = chomp_line(&line, &linesize);
246 if (linesize > 0) /* only allocate space for non-comments */
252 err(1, "fgetln on %s", file);
254 spec->entries = calloc(nlines, sizeof(*spec->entries));
255 if (spec->entries == NULL)
257 spec->nentries = nlines;
259 line = fgetln(fp, &linesize);
262 errx(1, "%s ended prematurely", file);
264 err(1, "failure reading %s", file);
266 freeline = chomp_line(&line, &linesize);
272 add_spec_line(file, is_sebsd, &spec->entries[--nlines], line);
278 warnx("%s: read %lu specifications", file,
279 (long)spec->nentries);
280 STAILQ_INSERT_TAIL(&specs->head, spec, link);
284 add_setfmac_specs(struct label_specs *specs, char *label)
286 struct label_spec *spec;
288 spec = malloc(sizeof(*spec));
292 spec->entries = calloc(spec->nentries, sizeof(*spec->entries));
293 if (spec->entries == NULL)
295 /* The _only_ thing specified here is the mactext! */
296 spec->entries->mactext = label;
297 spec->entries->flags |= F_ALWAYSMATCH;
298 STAILQ_INSERT_TAIL(&specs->head, spec, link);
302 add_spec_line(const char *file, int is_sebsd, struct label_spec_entry *entry,
305 char *regexstr, *modestr, *macstr, *regerrorstr;
309 regexstr = strtok(line, " \t");
310 if (regexstr == NULL)
311 errx(1, "%s: need regular expression", file);
312 modestr = strtok(NULL, " \t");
314 errx(1, "%s: need a label", file);
315 macstr = strtok(NULL, " \t");
316 if (macstr == NULL) { /* the mode is just optional */
320 if (strtok(NULL, " \t") != NULL)
321 errx(1, "%s: extraneous fields at end of line", file);
322 /* assume we need to anchor this regex */
323 if (asprintf(®exstr, "^%s$", regexstr) == -1)
324 err(1, "%s: processing regular expression", file);
325 entry->regexstr = regexstr;
326 error = regcomp(&entry->regex, regexstr, REG_EXTENDED | REG_NOSUB);
328 size = regerror(error, &entry->regex, NULL, 0);
329 regerrorstr = malloc(size);
330 if (regerrorstr == NULL)
332 (void)regerror(error, &entry->regex, regerrorstr, size);
333 errx(1, "%s: %s: %s", file, entry->regexstr, regerrorstr);
336 entry->mactext = strdup(macstr);
337 if (entry->mactext == NULL)
340 if (asprintf(&entry->mactext, "sebsd/%s", macstr) == -1)
342 if (strcmp(macstr, "<<none>>") == 0)
343 entry->flags |= F_DONTLABEL;
345 if (modestr != NULL) {
346 if (strlen(modestr) != 2 || modestr[0] != '-')
347 errx(1, "%s: invalid mode string: %s", file, modestr);
348 switch (modestr[1]) {
350 entry->mode = S_IFBLK;
351 entry->modestr = ",-b";
354 entry->mode = S_IFCHR;
355 entry->modestr = ",-c";
358 entry->mode = S_IFDIR;
359 entry->modestr = ",-d";
362 entry->mode = S_IFIFO;
363 entry->modestr = ",-p";
366 entry->mode = S_IFLNK;
367 entry->modestr = ",-l";
370 entry->mode = S_IFSOCK;
371 entry->modestr = ",-s";
374 entry->mode = S_IFREG;
375 entry->modestr = ",--";
378 errx(1, "%s: invalid mode string: %s", file, modestr);
386 specs_empty(struct label_specs *specs)
389 return (STAILQ_EMPTY(&specs->head));
393 apply_specs(struct label_specs *specs, FTSENT *ftsent, int hflag, int vflag)
396 struct label_spec *ls;
397 struct label_spec_entry *ent;
398 char *regerrorstr, *macstr;
401 int error, matchedby;
404 * Work through file context sources in order of specification
405 * on the command line, and through their entries in reverse
406 * order to find the "last" (hopefully "best") match.
409 STAILQ_FOREACH(ls, &specs->head, link) {
410 for (ls->match = NULL, ent = ls->entries;
411 ent < &ls->entries[ls->nentries]; ent++) {
412 if (ent->flags & F_ALWAYSMATCH)
414 if (ent->mode != 0 &&
415 (ftsent->fts_statp->st_mode & S_IFMT) != ent->mode)
418 pmatch.rm_eo = ftsent->fts_pathlen;
419 error = regexec(&ent->regex, ftsent->fts_path, 1,
420 &pmatch, REG_STARTEND);
427 size = regerror(error, &ent->regex, NULL, 0);
428 regerrorstr = malloc(size);
429 if (regerrorstr == NULL)
431 (void)regerror(error, &ent->regex, regerrorstr,
433 errx(1, "%s: %s", ent->regexstr, regerrorstr);
438 if (matchedby == 0) {
439 printf("%s matched by ",
443 printf("%s(%s%s,%s)", matchedby == 2 ? "," : "",
444 ent->regexstr, ent->modestr, ent->mactext);
451 if (vflag && matchedby)
454 STAILQ_FOREACH(ls, &specs->head, link) {
455 /* cached match decision */
456 if (ls->match && (ls->match->flags & F_DONTLABEL) == 0)
457 /* add length of "x\0"/"y," */
458 size += strlen(ls->match->mactext) + 1;
462 macstr = malloc(size);
466 STAILQ_FOREACH(ls, &specs->head, link) {
467 /* cached match decision */
468 if (ls->match && (ls->match->flags & F_DONTLABEL) == 0) {
471 strcat(macstr, ls->match->mactext);
474 if (mac_from_text(&mac, macstr))
475 err(1, "mac_from_text(%s)", macstr);
476 if ((hflag == FTS_PHYSICAL ? mac_set_link(ftsent->fts_accpath, mac) :
477 mac_set_file(ftsent->fts_accpath, mac)) != 0) {
478 if (errno == EOPNOTSUPP) {
483 err(1, "mac_set_link(%s, %s)", ftsent->fts_path, macstr);
493 struct label_specs *specs;
495 specs = malloc(sizeof(*specs));
498 STAILQ_INIT(&specs->head);