source: MondoRescue/branches/2.2.5/mindi-busybox/selinux/setfiles.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 15.4 KB
Line 
1/*
2 setfiles: based on policycoreutils 2.0.19
3 policycoreutils was released under GPL 2.
4 Port to BusyBox (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
5*/
6
7#include "libbb.h"
8#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
9#include <sepol/sepol.h>
10#endif
11
12#define MAX_EXCLUDES 50
13
14struct edir {
15 char *directory;
16 size_t size;
17};
18
19struct globals {
20 FILE *outfile;
21 char *policyfile;
22 char *rootpath;
23 int rootpathlen;
24 unsigned count;
25 int excludeCtr;
26 int errors;
27 int verbose; /* getopt32 uses it, has to be int */
28 smallint recurse; /* Recursive descent */
29 smallint follow_mounts;
30 /* Behavior flags determined based on setfiles vs. restorecon */
31 smallint expand_realpath; /* Expand paths via realpath */
32 smallint abort_on_error; /* Abort the file tree walk upon an error */
33 int add_assoc; /* Track inode associations for conflict detection */
34 int matchpathcon_flags; /* Flags to matchpathcon */
35 dev_t dev_id; /* Device id where target file exists */
36 int nerr;
37 struct edir excludeArray[MAX_EXCLUDES];
38};
39
40#define G (*(struct globals*)&bb_common_bufsiz1)
41void BUG_setfiles_globals_too_big(void);
42#define INIT_G() do { \
43 if (sizeof(G) > COMMON_BUFSIZE) \
44 BUG_setfiles_globals_too_big(); \
45 /* memset(&G, 0, sizeof(G)); - already is */ \
46} while (0)
47#define outfile (G.outfile )
48#define policyfile (G.policyfile )
49#define rootpath (G.rootpath )
50#define rootpathlen (G.rootpathlen )
51#define count (G.count )
52#define excludeCtr (G.excludeCtr )
53#define errors (G.errors )
54#define verbose (G.verbose )
55#define recurse (G.recurse )
56#define follow_mounts (G.follow_mounts )
57#define expand_realpath (G.expand_realpath )
58#define abort_on_error (G.abort_on_error )
59#define add_assoc (G.add_assoc )
60#define matchpathcon_flags (G.matchpathcon_flags)
61#define dev_id (G.dev_id )
62#define nerr (G.nerr )
63#define excludeArray (G.excludeArray )
64
65/* Must match getopt32 string! */
66enum {
67 OPT_d = (1 << 0),
68 OPT_e = (1 << 1),
69 OPT_f = (1 << 2),
70 OPT_i = (1 << 3),
71 OPT_l = (1 << 4),
72 OPT_n = (1 << 5),
73 OPT_p = (1 << 6),
74 OPT_q = (1 << 7),
75 OPT_r = (1 << 8),
76 OPT_s = (1 << 9),
77 OPT_v = (1 << 10),
78 OPT_o = (1 << 11),
79 OPT_F = (1 << 12),
80 OPT_W = (1 << 13),
81 OPT_c = (1 << 14), /* c only for setfiles */
82 OPT_R = (1 << 14), /* R only for restorecon */
83};
84#define FLAG_d_debug (option_mask32 & OPT_d)
85#define FLAG_e (option_mask32 & OPT_e)
86#define FLAG_f (option_mask32 & OPT_f)
87#define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
88#define FLAG_l_take_log (option_mask32 & OPT_l)
89#define FLAG_n_dry_run (option_mask32 & OPT_n)
90#define FLAG_p_progress (option_mask32 & OPT_p)
91#define FLAG_q_quiet (option_mask32 & OPT_q)
92#define FLAG_r (option_mask32 & OPT_r)
93#define FLAG_s (option_mask32 & OPT_s)
94#define FLAG_v (option_mask32 & OPT_v)
95#define FLAG_o (option_mask32 & OPT_o)
96#define FLAG_F_force (option_mask32 & OPT_F)
97#define FLAG_W_warn_no_match (option_mask32 & OPT_W)
98#define FLAG_c (option_mask32 & OPT_c)
99#define FLAG_R (option_mask32 & OPT_R)
100
101
102static void qprintf(const char *fmt, ...)
103{
104 /* quiet, do nothing */
105}
106
107static void inc_err(void)
108{
109 nerr++;
110 if (nerr > 9 && !FLAG_d_debug) {
111 bb_error_msg_and_die("exiting after 10 errors");
112 }
113}
114
115static void add_exclude(const char *const directory)
116{
117 struct stat sb;
118 size_t len;
119
120 if (directory == NULL || directory[0] != '/') {
121 bb_error_msg_and_die("full path required for exclude: %s", directory);
122
123 }
124 if (lstat(directory, &sb)) {
125 bb_error_msg("directory \"%s\" not found, ignoring", directory);
126 return;
127 }
128 if ((sb.st_mode & S_IFDIR) == 0) {
129 bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
130 directory, sb.st_mode);
131 return;
132 }
133 if (excludeCtr == MAX_EXCLUDES) {
134 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
135 }
136
137 len = strlen(directory);
138 while (len > 1 && directory[len - 1] == '/') {
139 len--;
140 }
141 excludeArray[excludeCtr].directory = xstrndup(directory, len);
142 excludeArray[excludeCtr++].size = len;
143}
144
145static bool exclude(const char *file)
146{
147 int i = 0;
148 for (i = 0; i < excludeCtr; i++) {
149 if (strncmp(file, excludeArray[i].directory,
150 excludeArray[i].size) == 0) {
151 if (file[excludeArray[i].size] == '\0'
152 || file[excludeArray[i].size] == '/') {
153 return 1;
154 }
155 }
156 }
157 return 0;
158}
159
160static int match(const char *name, struct stat *sb, char **con)
161{
162 int ret;
163 char path[PATH_MAX + 1];
164 char *tmp_path = xstrdup(name);
165
166 if (excludeCtr > 0 && exclude(name)) {
167 goto err;
168 }
169 ret = lstat(name, sb);
170 if (ret) {
171 if (FLAG_i_ignore_enoent && errno == ENOENT) {
172 free(tmp_path);
173 return 0;
174 }
175 bb_error_msg("stat(%s)", name);
176 goto err;
177 }
178
179 if (expand_realpath) {
180 if (S_ISLNK(sb->st_mode)) {
181 char *p = NULL;
182 char *file_sep;
183
184 size_t len = 0;
185
186 if (verbose > 1)
187 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
188
189 file_sep = strrchr(tmp_path, '/');
190 if (file_sep == tmp_path) {
191 file_sep++;
192 path[0] = '\0';
193 p = path;
194 } else if (file_sep) {
195 *file_sep++ = '\0';
196 p = realpath(tmp_path, path);
197 } else {
198 file_sep = tmp_path;
199 p = realpath("./", path);
200 }
201 if (p)
202 len = strlen(p);
203 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
204 bb_perror_msg("realpath(%s) failed", name);
205 goto err;
206 }
207 p += len;
208 /* ensure trailing slash of directory name */
209 if (len == 0 || p[-1] != '/') {
210 *p++ = '/';
211 }
212 strcpy(p, file_sep);
213 name = path;
214 if (excludeCtr > 0 && exclude(name))
215 goto err;
216
217 } else {
218 char *p;
219 p = realpath(name, path);
220 if (!p) {
221 bb_perror_msg("realpath(%s)", name);
222 goto err;
223 }
224 name = p;
225 if (excludeCtr > 0 && exclude(name))
226 goto err;
227 }
228 }
229
230 /* name will be what is matched in the policy */
231 if (NULL != rootpath) {
232 if (0 != strncmp(rootpath, name, rootpathlen)) {
233 bb_error_msg("%s is not located in %s",
234 name, rootpath);
235 goto err;
236 }
237 name += rootpathlen;
238 }
239
240 free(tmp_path);
241 if (rootpath != NULL && name[0] == '\0')
242 /* this is actually the root dir of the alt root */
243 return matchpathcon_index("/", sb->st_mode, con);
244 return matchpathcon_index(name, sb->st_mode, con);
245 err:
246 free(tmp_path);
247 return -1;
248}
249
250/* Compare two contexts to see if their differences are "significant",
251 * or whether the only difference is in the user. */
252static bool only_changed_user(const char *a, const char *b)
253{
254 if (FLAG_F_force)
255 return 0;
256 if (!a || !b)
257 return 0;
258 a = strchr(a, ':'); /* Rest of the context after the user */
259 b = strchr(b, ':');
260 if (!a || !b)
261 return 0;
262 return (strcmp(a, b) == 0);
263}
264
265static int restore(const char *file)
266{
267 char *my_file;
268 struct stat my_sb;
269 int i, j, ret;
270 char *context = NULL;
271 char *newcon = NULL;
272 bool user_only_changed = 0;
273 int retval = 0;
274
275 my_file = bb_simplify_path(file);
276
277 i = match(my_file, &my_sb, &newcon);
278
279 if (i < 0) /* No matching specification. */
280 goto out;
281
282 if (FLAG_p_progress) {
283 count++;
284 if (count % 0x400 == 0) { /* every 1024 times */
285 count = (count % (80*0x400));
286 if (count == 0)
287 fputc('\n', stdout);
288 fputc('*', stdout);
289 fflush(stdout);
290 }
291 }
292
293 /*
294 * Try to add an association between this inode and
295 * this specification. If there is already an association
296 * for this inode and it conflicts with this specification,
297 * then use the last matching specification.
298 */
299 if (add_assoc) {
300 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
301 if (j < 0)
302 goto err;
303
304 if (j != i) {
305 /* There was already an association and it took precedence. */
306 goto out;
307 }
308 }
309
310 if (FLAG_d_debug)
311 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
312
313 /* Get the current context of the file. */
314 ret = lgetfilecon_raw(my_file, &context);
315 if (ret < 0) {
316 if (errno == ENODATA) {
317 context = NULL; /* paranoia */
318 } else {
319 bb_perror_msg("lgetfilecon_raw on %s", my_file);
320 goto err;
321 }
322 user_only_changed = 0;
323 } else
324 user_only_changed = only_changed_user(context, newcon);
325
326 /*
327 * Do not relabel the file if the matching specification is
328 * <<none>> or the file is already labeled according to the
329 * specification.
330 */
331 if ((strcmp(newcon, "<<none>>") == 0)
332 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
333 goto out;
334 }
335
336 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
337 if (verbose > 1) {
338 bb_error_msg("skipping %s. %s is customizable_types",
339 my_file, context);
340 }
341 goto out;
342 }
343
344 if (verbose) {
345 /* If we're just doing "-v", trim out any relabels where
346 * the user has changed but the role and type are the
347 * same. For "-vv", emit everything. */
348 if (verbose > 1 || !user_only_changed) {
349 bb_info_msg("%s: reset %s context %s->%s",
350 applet_name, my_file, context ?: "", newcon);
351 }
352 }
353
354 if (FLAG_l_take_log && !user_only_changed) {
355 if (context)
356 bb_info_msg("relabeling %s from %s to %s", my_file, context, newcon);
357 else
358 bb_info_msg("labeling %s to %s", my_file, newcon);
359 }
360
361 if (outfile && !user_only_changed)
362 fprintf(outfile, "%s\n", my_file);
363
364 /*
365 * Do not relabel the file if -n was used.
366 */
367 if (FLAG_n_dry_run || user_only_changed)
368 goto out;
369
370 /*
371 * Relabel the file to the specified context.
372 */
373 ret = lsetfilecon(my_file, newcon);
374 if (ret) {
375 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
376 goto err;
377 }
378
379 out:
380 freecon(context);
381 freecon(newcon);
382 free(my_file);
383 return retval;
384 err:
385 retval--; /* -1 */
386 goto out;
387}
388
389/*
390 * Apply the last matching specification to a file.
391 * This function is called by recursive_action on each file during
392 * the directory traversal.
393 */
394static int apply_spec(const char *file,
395 struct stat *sb, void *userData, int depth)
396{
397 if (!follow_mounts) {
398 /* setfiles does not process across different mount points */
399 if (sb->st_dev != dev_id) {
400 return SKIP;
401 }
402 }
403 errors |= restore(file);
404 if (abort_on_error && errors)
405 return FALSE;
406 return TRUE;
407}
408
409
410static int canoncon(const char *path, unsigned lineno, char **contextp)
411{
412 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
413
414 char *tmpcon;
415 char *context = *contextp;
416 int invalid = 0;
417
418#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
419 if (policyfile) {
420 if (sepol_check_context(context) >= 0)
421 return 0;
422 /* Exit immediately if we're in checking mode. */
423 bb_error_msg_and_die(err_msg, path, lineno, context);
424 }
425#endif
426
427 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
428 if (errno != ENOENT) {
429 invalid = 1;
430 inc_err();
431 }
432 } else {
433 free(context);
434 *contextp = tmpcon;
435 }
436
437 if (invalid) {
438 bb_error_msg(err_msg, path, lineno, context);
439 }
440
441 return invalid;
442}
443
444static int process_one(char *name)
445{
446 struct stat sb;
447 int rc;
448
449 rc = lstat(name, &sb);
450 if (rc < 0) {
451 if (FLAG_i_ignore_enoent && errno == ENOENT)
452 return 0;
453 bb_perror_msg("stat(%s)", name);
454 goto err;
455 }
456 dev_id = sb.st_dev;
457
458 if (S_ISDIR(sb.st_mode) && recurse) {
459 if (recursive_action(name,
460 ACTION_RECURSE,
461 apply_spec,
462 apply_spec,
463 NULL, 0) != TRUE) {
464 bb_error_msg("error while labeling %s", name);
465 goto err;
466 }
467 } else {
468 rc = restore(name);
469 if (rc)
470 goto err;
471 }
472
473 out:
474 if (add_assoc) {
475 if (FLAG_q_quiet)
476 set_matchpathcon_printf(&qprintf);
477 matchpathcon_filespec_eval();
478 set_matchpathcon_printf(NULL);
479 matchpathcon_filespec_destroy();
480 }
481
482 return rc;
483
484 err:
485 rc = -1;
486 goto out;
487}
488
489int setfiles_main(int argc, char **argv);
490int setfiles_main(int argc, char **argv)
491{
492 struct stat sb;
493 int rc, i = 0;
494 const char *input_filename = NULL;
495 char *buf = NULL;
496 size_t buf_len;
497 int flags;
498 llist_t *exclude_dir = NULL;
499 char *out_filename = NULL;
500
501 INIT_G();
502
503 if (applet_name[0] == 's') { /* "setfiles" */
504 /*
505 * setfiles:
506 * Recursive descent,
507 * Does not expand paths via realpath,
508 * Aborts on errors during the file tree walk,
509 * Try to track inode associations for conflict detection,
510 * Does not follow mounts,
511 * Validates all file contexts at init time.
512 */
513 recurse = 1;
514 abort_on_error = 1;
515 add_assoc = 1;
516 /* follow_mounts = 0; - already is */
517 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
518 } else {
519 /*
520 * restorecon:
521 * No recursive descent unless -r/-R,
522 * Expands paths via realpath,
523 * Do not abort on errors during the file tree walk,
524 * Do not try to track inode associations for conflict detection,
525 * Follows mounts,
526 * Does lazy validation of contexts upon use.
527 */
528 expand_realpath = 1;
529 follow_mounts = 1;
530 matchpathcon_flags = MATCHPATHCON_NOTRANS;
531 /* restorecon only */
532 selinux_or_die();
533 }
534
535 set_matchpathcon_flags(matchpathcon_flags);
536
537 opt_complementary = "e::vv:v--p:p--v:v--q:q--v";
538 /* Option order must match OPT_x definitions! */
539 if (applet_name[0] == 'r') { /* restorecon */
540 flags = getopt32(argv, "de:f:ilnpqrsvo:FWR",
541 &exclude_dir, &input_filename, &out_filename, &verbose);
542 } else { /* setfiles */
543 flags = getopt32(argv, "de:f:ilnpqr:svo:FW"
544 USE_FEATURE_SETFILES_CHECK_OPTION("c:"),
545 &exclude_dir, &input_filename, &rootpath, &out_filename,
546 USE_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
547 &verbose);
548 }
549
550#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
551 if ((applet_name[0] == 's') && (flags & OPT_c)) {
552 FILE *policystream;
553
554 policystream = xfopen(policyfile, "r");
555 if (sepol_set_policydb_from_file(policystream) < 0) {
556 bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile);
557 }
558 fclose(policystream);
559
560 /* Only process the specified file_contexts file, not
561 any .homedirs or .local files, and do not perform
562 context translations. */
563 set_matchpathcon_flags(MATCHPATHCON_BASEONLY |
564 MATCHPATHCON_NOTRANS |
565 MATCHPATHCON_VALIDATE);
566 }
567#endif
568
569 while (exclude_dir)
570 add_exclude(llist_pop(&exclude_dir));
571
572 if (flags & OPT_o) {
573 outfile = stdout;
574 if (NOT_LONE_CHAR(out_filename, '-')) {
575 outfile = xfopen(out_filename, "w");
576 }
577 }
578 if (applet_name[0] == 'r') { /* restorecon */
579 if (flags & (OPT_r | OPT_R))
580 recurse = 1;
581 } else { /* setfiles */
582 if (flags & OPT_r)
583 rootpathlen = strlen(rootpath);
584 }
585 if (flags & OPT_s) {
586 input_filename = "-";
587 add_assoc = 0;
588 }
589
590 if (applet_name[0] == 's') { /* setfiles */
591 /* Use our own invalid context checking function so that
592 we can support either checking against the active policy or
593 checking against a binary policy file. */
594 set_matchpathcon_canoncon(&canoncon);
595 if (argc == 1)
596 bb_show_usage();
597 if (stat(argv[optind], &sb) < 0) {
598 bb_perror_msg_and_die("%s", argv[optind]);
599 }
600 if (!S_ISREG(sb.st_mode)) {
601 bb_error_msg_and_die("spec file %s is not a regular file", argv[optind]);
602 }
603 /* Load the file contexts configuration and check it. */
604 rc = matchpathcon_init(argv[optind]);
605 if (rc < 0) {
606 bb_perror_msg_and_die("%s", argv[optind]);
607 }
608
609 optind++;
610
611 if (nerr)
612 exit(1);
613 }
614
615 if (input_filename) {
616 ssize_t len;
617 FILE *f = stdin;
618
619 if (NOT_LONE_CHAR(input_filename, '-'))
620 f = xfopen(input_filename, "r");
621 while ((len = getline(&buf, &buf_len, f)) > 0) {
622 buf[len - 1] = '\0';
623 errors |= process_one(buf);
624 }
625 if (ENABLE_FEATURE_CLEAN_UP)
626 fclose_if_not_stdin(f);
627 } else {
628 if (optind >= argc)
629 bb_show_usage();
630 for (i = optind; i < argc; i++) {
631 errors |= process_one(argv[i]);
632 }
633 }
634
635 if (FLAG_W_warn_no_match)
636 matchpathcon_checkmatches(argv[0]);
637
638 if (ENABLE_FEATURE_CLEAN_UP && outfile)
639 fclose(outfile);
640
641 return errors;
642}
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