1 /*- 2 * Copyright (c) 2002, 2004 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by NAI Labs, the 6 * Security Research Division of Network Associates, Inc. under 7 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 8 * CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include <sys/types.h> 35 #include <sys/mac.h> 36 #include <sys/queue.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <fts.h> 43 #include <libgen.h> 44 #include <regex.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 struct label_spec { 51 struct label_spec_entry { 52 regex_t regex; /* compiled regular expression to match */ 53 char *regexstr; /* uncompiled regular expression */ 54 mode_t mode; /* mode to possibly match */ 55 const char *modestr; /* print-worthy ",-?" mode string */ 56 char *mactext; /* MAC label to apply */ 57 int flags; /* miscellaneous flags */ 58 #define F_DONTLABEL 0x01 59 #define F_ALWAYSMATCH 0x02 60 } *entries, /* entries[0..nentries] */ 61 *match; /* cached decision for MAC label to apply */ 62 size_t nentries; /* size of entries list */ 63 STAILQ_ENTRY(label_spec) link; 64 }; 65 66 struct label_specs { 67 STAILQ_HEAD(label_specs_head, label_spec) head; 68 }; 69 70 void usage(int) __dead2; 71 struct label_specs *new_specs(void); 72 void add_specs(struct label_specs *, const char *, int); 73 void add_setfmac_specs(struct label_specs *, char *); 74 void add_spec_line(const char *, int, struct label_spec_entry *, char *); 75 int apply_specs(struct label_specs *, FTSENT *, int, int); 76 int specs_empty(struct label_specs *); 77 78 static int qflag; 79 80 int 81 main(int argc, char **argv) 82 { 83 FTSENT *ftsent; 84 FTS *fts; 85 struct label_specs *specs; 86 int eflag = 0, xflag = 0, vflag = 0, Rflag = 0, hflag; 87 int ch, is_setfmac; 88 char *bn; 89 90 bn = basename(argv[0]); 91 if (bn == NULL) 92 err(1, "basename"); 93 is_setfmac = strcmp(bn, "setfmac") == 0; 94 hflag = is_setfmac ? FTS_LOGICAL : FTS_PHYSICAL; 95 specs = new_specs(); 96 while ((ch = getopt(argc, argv, is_setfmac ? "Rhq" : "ef:qs:vx")) != 97 -1) { 98 switch (ch) { 99 case 'R': 100 Rflag = 1; 101 break; 102 case 'e': 103 eflag = 1; 104 break; 105 case 'f': 106 add_specs(specs, optarg, 0); 107 break; 108 case 'h': 109 hflag = FTS_PHYSICAL; 110 break; 111 case 'q': 112 qflag = 1; 113 break; 114 case 's': 115 add_specs(specs, optarg, 1); 116 break; 117 case 'v': 118 vflag++; 119 break; 120 case 'x': 121 xflag = FTS_XDEV; 122 break; 123 default: 124 usage(is_setfmac); 125 } 126 } 127 argc -= optind; 128 argv += optind; 129 130 if (is_setfmac) { 131 if (argc <= 1) 132 usage(is_setfmac); 133 add_setfmac_specs(specs, *argv); 134 argc--; 135 argv++; 136 } else { 137 if (argc == 0 || specs_empty(specs)) 138 usage(is_setfmac); 139 } 140 fts = fts_open(argv, hflag | xflag, NULL); 141 if (fts == NULL) 142 err(1, "cannot traverse filesystem%s", argc ? "s" : ""); 143 while ((ftsent = fts_read(fts)) != NULL) { 144 switch (ftsent->fts_info) { 145 case FTS_DP: /* skip post-order */ 146 break; 147 case FTS_D: /* do pre-order */ 148 case FTS_DC: /* do cyclic? */ 149 /* don't ever recurse directories as setfmac(8) */ 150 if (is_setfmac && !Rflag) 151 fts_set(fts, ftsent, FTS_SKIP); 152 case FTS_DEFAULT: /* do default */ 153 case FTS_F: /* do regular */ 154 case FTS_SL: /* do symlink */ 155 case FTS_SLNONE: /* do symlink */ 156 case FTS_W: /* do whiteout */ 157 if (apply_specs(specs, ftsent, hflag, vflag)) { 158 if (eflag) { 159 errx(1, "labeling not supported in " 160 "%.*s", ftsent->fts_pathlen, 161 ftsent->fts_path); 162 } 163 if (!qflag) 164 warnx("labeling not supported in %.*s", 165 ftsent->fts_pathlen, 166 ftsent->fts_path); 167 fts_set(fts, ftsent, FTS_SKIP); 168 } 169 break; 170 case FTS_DNR: /* die on all errors */ 171 case FTS_ERR: 172 case FTS_NS: 173 err(1, "traversing %.*s", ftsent->fts_pathlen, 174 ftsent->fts_path); 175 default: 176 errx(1, "CANNOT HAPPEN (%d) traversing %.*s", 177 ftsent->fts_info, ftsent->fts_pathlen, 178 ftsent->fts_path); 179 } 180 } 181 fts_close(fts); 182 exit(0); 183 } 184 185 void 186 usage(int is_setfmac) 187 { 188 189 if (is_setfmac) 190 fprintf(stderr, "usage: setfmac [-Rhq] label file ...\n"); 191 else 192 fprintf(stderr, "usage: setfsmac [-ehqvx] [-f specfile [...]] [-s specfile [...]] file ...\n"); 193 exit(1); 194 } 195 196 static int 197 chomp_line(char **line, size_t *linesize) 198 { 199 char *s; 200 int freeme = 0; 201 202 for (s = *line; (unsigned)(s - *line) < *linesize; s++) { 203 if (!isspace(*s)) 204 break; 205 } 206 if (*s == '#') { 207 **line = '\0'; 208 *linesize = 0; 209 return (freeme); 210 } 211 memmove(*line, s, *linesize - (s - *line)); 212 *linesize -= s - *line; 213 for (s = &(*line)[*linesize - 1]; s >= *line; s--) { 214 if (!isspace(*s)) 215 break; 216 } 217 if (s != &(*line)[*linesize - 1]) { 218 *linesize = s - *line + 1; 219 } else { 220 s = malloc(*linesize + 1); 221 if (s == NULL) 222 err(1, "malloc"); 223 strncpy(s, *line, *linesize); 224 *line = s; 225 freeme = 1; 226 } 227 (*line)[*linesize] = '\0'; 228 return (freeme); 229 } 230 231 void 232 add_specs(struct label_specs *specs, const char *file, int is_sebsd) 233 { 234 struct label_spec *spec; 235 FILE *fp; 236 char *line; 237 size_t nlines = 0, linesize; 238 int freeline; 239 240 spec = malloc(sizeof(*spec)); 241 if (spec == NULL) 242 err(1, "malloc"); 243 fp = fopen(file, "r"); 244 if (fp == NULL) 245 err(1, "opening %s", file); 246 while ((line = fgetln(fp, &linesize)) != NULL) { 247 freeline = chomp_line(&line, &linesize); 248 if (linesize > 0) /* only allocate space for non-comments */ 249 nlines++; 250 if (freeline) 251 free(line); 252 } 253 if (ferror(fp)) 254 err(1, "fgetln on %s", file); 255 rewind(fp); 256 spec->entries = calloc(nlines, sizeof(*spec->entries)); 257 if (spec->entries == NULL) 258 err(1, "malloc"); 259 spec->nentries = nlines; 260 while (nlines > 0) { 261 line = fgetln(fp, &linesize); 262 if (line == NULL) { 263 if (feof(fp)) 264 errx(1, "%s ended prematurely", file); 265 else 266 err(1, "failure reading %s", file); 267 } 268 freeline = chomp_line(&line, &linesize); 269 if (linesize == 0) { 270 if (freeline) 271 free(line); 272 continue; 273 } 274 add_spec_line(file, is_sebsd, &spec->entries[--nlines], line); 275 if (freeline) 276 free(line); 277 } 278 fclose(fp); 279 if (!qflag) 280 warnx("%s: read %lu specifications", file, 281 (long)spec->nentries); 282 STAILQ_INSERT_TAIL(&specs->head, spec, link); 283 } 284 285 void 286 add_setfmac_specs(struct label_specs *specs, char *label) 287 { 288 struct label_spec *spec; 289 290 spec = malloc(sizeof(*spec)); 291 if (spec == NULL) 292 err(1, "malloc"); 293 spec->nentries = 1; 294 spec->entries = calloc(spec->nentries, sizeof(*spec->entries)); 295 if (spec->entries == NULL) 296 err(1, "malloc"); 297 /* The _only_ thing specified here is the mactext! */ 298 spec->entries->mactext = label; 299 spec->entries->flags |= F_ALWAYSMATCH; 300 STAILQ_INSERT_TAIL(&specs->head, spec, link); 301 } 302 303 void 304 add_spec_line(const char *file, int is_sebsd, struct label_spec_entry *entry, 305 char *line) 306 { 307 char *regexstr, *modestr, *macstr, *regerrorstr; 308 size_t size; 309 int error; 310 311 regexstr = strtok(line, " \t"); 312 if (regexstr == NULL) 313 errx(1, "%s: need regular expression", file); 314 modestr = strtok(NULL, " \t"); 315 if (modestr == NULL) 316 errx(1, "%s: need a label", file); 317 macstr = strtok(NULL, " \t"); 318 if (macstr == NULL) { /* the mode is just optional */ 319 macstr = modestr; 320 modestr = NULL; 321 } 322 if (strtok(NULL, " \t") != NULL) 323 errx(1, "%s: extraneous fields at end of line", file); 324 /* assume we need to anchor this regex */ 325 if (asprintf(®exstr, "^%s$", regexstr) == -1) 326 err(1, "%s: processing regular expression", file); 327 entry->regexstr = regexstr; 328 error = regcomp(&entry->regex, regexstr, REG_EXTENDED | REG_NOSUB); 329 if (error) { 330 size = regerror(error, &entry->regex, NULL, 0); 331 regerrorstr = malloc(size); 332 if (regerrorstr == NULL) 333 err(1, "malloc"); 334 (void)regerror(error, &entry->regex, regerrorstr, size); 335 errx(1, "%s: %s: %s", file, entry->regexstr, regerrorstr); 336 } 337 if (!is_sebsd) { 338 entry->mactext = strdup(macstr); 339 if (entry->mactext == NULL) 340 err(1, "strdup"); 341 } else { 342 if (asprintf(&entry->mactext, "sebsd/%s", macstr) == -1) 343 err(1, "asprintf"); 344 if (strcmp(macstr, "<<none>>") == 0) 345 entry->flags |= F_DONTLABEL; 346 } 347 if (modestr != NULL) { 348 if (strlen(modestr) != 2 || modestr[0] != '-') 349 errx(1, "%s: invalid mode string: %s", file, modestr); 350 switch (modestr[1]) { 351 case 'b': 352 entry->mode = S_IFBLK; 353 entry->modestr = ",-b"; 354 break; 355 case 'c': 356 entry->mode = S_IFCHR; 357 entry->modestr = ",-c"; 358 break; 359 case 'd': 360 entry->mode = S_IFDIR; 361 entry->modestr = ",-d"; 362 break; 363 case 'p': 364 entry->mode = S_IFIFO; 365 entry->modestr = ",-p"; 366 break; 367 case 'l': 368 entry->mode = S_IFLNK; 369 entry->modestr = ",-l"; 370 break; 371 case 's': 372 entry->mode = S_IFSOCK; 373 entry->modestr = ",-s"; 374 break; 375 case '-': 376 entry->mode = S_IFREG; 377 entry->modestr = ",--"; 378 break; 379 default: 380 errx(1, "%s: invalid mode string: %s", file, modestr); 381 } 382 } else { 383 entry->modestr = ""; 384 } 385 } 386 387 int 388 specs_empty(struct label_specs *specs) 389 { 390 391 return (STAILQ_EMPTY(&specs->head)); 392 } 393 394 int 395 apply_specs(struct label_specs *specs, FTSENT *ftsent, int hflag, int vflag) 396 { 397 regmatch_t pmatch; 398 struct label_spec *ls; 399 struct label_spec_entry *ent; 400 char *regerrorstr, *macstr; 401 size_t size; 402 mac_t mac; 403 int error, matchedby; 404 405 /* 406 * Work through file context sources in order of specification 407 * on the command line, and through their entries in reverse 408 * order to find the "last" (hopefully "best") match. 409 */ 410 matchedby = 0; 411 STAILQ_FOREACH(ls, &specs->head, link) { 412 for (ls->match = NULL, ent = ls->entries; 413 ent < &ls->entries[ls->nentries]; ent++) { 414 if (ent->flags & F_ALWAYSMATCH) 415 goto matched; 416 if (ent->mode != 0 && 417 (ftsent->fts_statp->st_mode & S_IFMT) != ent->mode) 418 continue; 419 pmatch.rm_so = 0; 420 pmatch.rm_eo = ftsent->fts_pathlen; 421 error = regexec(&ent->regex, ftsent->fts_path, 1, 422 &pmatch, REG_STARTEND); 423 switch (error) { 424 case REG_NOMATCH: 425 continue; 426 case 0: 427 break; 428 default: 429 size = regerror(error, &ent->regex, NULL, 0); 430 regerrorstr = malloc(size); 431 if (regerrorstr == NULL) 432 err(1, "malloc"); 433 (void)regerror(error, &ent->regex, regerrorstr, 434 size); 435 errx(1, "%s: %s", ent->regexstr, regerrorstr); 436 } 437 matched: 438 ls->match = ent; 439 if (vflag) { 440 if (matchedby == 0) { 441 printf("%.*s matched by ", 442 ftsent->fts_pathlen, 443 ftsent->fts_path); 444 matchedby = 1; 445 } 446 printf("%s(%s%s,%s)", matchedby == 2 ? "," : "", 447 ent->regexstr, ent->modestr, ent->mactext); 448 if (matchedby == 1) 449 matchedby = 2; 450 } 451 break; 452 } 453 } 454 if (vflag && matchedby) 455 printf("\n"); 456 size = 0; 457 STAILQ_FOREACH(ls, &specs->head, link) { 458 /* cached match decision */ 459 if (ls->match && (ls->match->flags & F_DONTLABEL) == 0) 460 /* add length of "x\0"/"y," */ 461 size += strlen(ls->match->mactext) + 1; 462 } 463 if (size == 0) 464 return (0); 465 macstr = malloc(size); 466 if (macstr == NULL) 467 err(1, "malloc"); 468 *macstr = '\0'; 469 STAILQ_FOREACH(ls, &specs->head, link) { 470 /* cached match decision */ 471 if (ls->match && (ls->match->flags & F_DONTLABEL) == 0) { 472 if (*macstr != '\0') 473 strcat(macstr, ","); 474 strcat(macstr, ls->match->mactext); 475 } 476 } 477 if (mac_from_text(&mac, macstr)) 478 err(1, "mac_from_text(%s)", macstr); 479 if ((hflag == FTS_PHYSICAL ? mac_set_link(ftsent->fts_accpath, mac) : 480 mac_set_file(ftsent->fts_accpath, mac)) != 0) { 481 if (errno == EOPNOTSUPP) { 482 mac_free(mac); 483 free(macstr); 484 return (1); 485 } 486 err(1, "mac_set_link(%.*s, %s)", ftsent->fts_pathlen, 487 ftsent->fts_path, macstr); 488 } 489 mac_free(mac); 490 free(macstr); 491 return (0); 492 } 493 494 struct label_specs * 495 new_specs(void) 496 { 497 struct label_specs *specs; 498 499 specs = malloc(sizeof(*specs)); 500 if (specs == NULL) 501 err(1, "malloc"); 502 STAILQ_INIT(&specs->head); 503 return (specs); 504 } 505