source: MondoRescue/branches/3.3/mindi-busybox/selinux/setfiles.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
  • Property svn:eol-style set to native
File size: 17.5 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//usage:#define setfiles_trivial_usage
8//usage: "[-dnpqsvW] [-e DIR]... [-o FILE] [-r alt_root_path]"
9//usage: IF_FEATURE_SETFILES_CHECK_OPTION(
10//usage: " [-c policyfile] spec_file"
11//usage: )
12//usage: " pathname"
13//usage:#define setfiles_full_usage "\n\n"
14//usage: "Reset file contexts under pathname according to spec_file\n"
15//usage: IF_FEATURE_SETFILES_CHECK_OPTION(
16//usage: "\n -c FILE Check the validity of the contexts against the specified binary policy"
17//usage: )
18//usage: "\n -d Show which specification matched each file"
19//usage: "\n -l Log changes in file labels to syslog"
20//TODO: log to syslog is not yet implemented, it goes to stdout only now
21//usage: "\n -n Don't change any file labels"
22//usage: "\n -q Suppress warnings"
23//usage: "\n -r DIR Use an alternate root path"
24//usage: "\n -e DIR Exclude DIR"
25//usage: "\n -F Force reset of context to match file_context for customizable files"
26//usage: "\n -o FILE Save list of files with incorrect context"
27//usage: "\n -s Take a list of files from stdin (instead of command line)"
28//usage: "\n -v Show changes in file labels, if type or role are changing"
29//usage: "\n -vv Show changes in file labels, if type, role, or user are changing"
30//usage: "\n -W Display warnings about entries that had no matching files"
31//usage:
32//usage:#define restorecon_trivial_usage
33//usage: "[-iFnRv] [-e EXCLUDEDIR]... [-o FILE] [-f FILE]"
34//usage:#define restorecon_full_usage "\n\n"
35//usage: "Reset security contexts of files in pathname\n"
36//usage: "\n -i Ignore files that don't exist"
37//usage: "\n -f FILE File with list of files to process"
38//usage: "\n -e DIR Directory to exclude"
39//usage: "\n -R,-r Recurse"
40//usage: "\n -n Don't change any file labels"
41//usage: "\n -o FILE Save list of files with incorrect context"
42//usage: "\n -v Verbose"
43//usage: "\n -vv Show changed labels"
44//usage: "\n -F Force reset of context to match file_context"
45//usage: "\n for customizable files, or the user section,"
46//usage: "\n if it has changed"
47
48#include "libbb.h"
49#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
50#include <sepol/sepol.h>
51#endif
52
53#define MAX_EXCLUDES 50
54
55struct edir {
56 char *directory;
57 size_t size;
58};
59
60struct globals {
61 FILE *outfile;
62 char *policyfile;
63 char *rootpath;
64 int rootpathlen;
65 unsigned count;
66 int excludeCtr;
67 int errors;
68 int verbose; /* getopt32 uses it, has to be int */
69 smallint recurse; /* Recursive descent */
70 smallint follow_mounts;
71 /* Behavior flags determined based on setfiles vs. restorecon */
72 smallint expand_realpath; /* Expand paths via realpath */
73 smallint abort_on_error; /* Abort the file tree walk upon an error */
74 int add_assoc; /* Track inode associations for conflict detection */
75 int matchpathcon_flags; /* Flags to matchpathcon */
76 dev_t dev_id; /* Device id where target file exists */
77 int nerr;
78 struct edir excludeArray[MAX_EXCLUDES];
79} FIX_ALIASING;
80#define G (*(struct globals*)bb_common_bufsiz1)
81void BUG_setfiles_globals_too_big(void);
82#define INIT_G() do { \
83 setup_common_bufsiz(); \
84 if (sizeof(G) > COMMON_BUFSIZE) \
85 BUG_setfiles_globals_too_big(); \
86 /* memset(&G, 0, sizeof(G)); - already is */ \
87} while (0)
88#define outfile (G.outfile )
89#define policyfile (G.policyfile )
90#define rootpath (G.rootpath )
91#define rootpathlen (G.rootpathlen )
92#define count (G.count )
93#define excludeCtr (G.excludeCtr )
94#define errors (G.errors )
95#define verbose (G.verbose )
96#define recurse (G.recurse )
97#define follow_mounts (G.follow_mounts )
98#define expand_realpath (G.expand_realpath )
99#define abort_on_error (G.abort_on_error )
100#define add_assoc (G.add_assoc )
101#define matchpathcon_flags (G.matchpathcon_flags)
102#define dev_id (G.dev_id )
103#define nerr (G.nerr )
104#define excludeArray (G.excludeArray )
105
106/* Must match getopt32 string! */
107enum {
108 OPT_d = (1 << 0),
109 OPT_e = (1 << 1),
110 OPT_f = (1 << 2),
111 OPT_i = (1 << 3),
112 OPT_l = (1 << 4),
113 OPT_n = (1 << 5),
114 OPT_p = (1 << 6),
115 OPT_q = (1 << 7),
116 OPT_r = (1 << 8),
117 OPT_s = (1 << 9),
118 OPT_v = (1 << 10),
119 OPT_o = (1 << 11),
120 OPT_F = (1 << 12),
121 OPT_W = (1 << 13),
122 OPT_c = (1 << 14), /* c only for setfiles */
123 OPT_R = (1 << 14), /* R only for restorecon */
124};
125#define FLAG_d_debug (option_mask32 & OPT_d)
126#define FLAG_e (option_mask32 & OPT_e)
127#define FLAG_f (option_mask32 & OPT_f)
128#define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
129#define FLAG_l_take_log (option_mask32 & OPT_l)
130#define FLAG_n_dry_run (option_mask32 & OPT_n)
131#define FLAG_p_progress (option_mask32 & OPT_p)
132#define FLAG_q_quiet (option_mask32 & OPT_q)
133#define FLAG_r (option_mask32 & OPT_r)
134#define FLAG_s (option_mask32 & OPT_s)
135#define FLAG_v (option_mask32 & OPT_v)
136#define FLAG_o (option_mask32 & OPT_o)
137#define FLAG_F_force (option_mask32 & OPT_F)
138#define FLAG_W_warn_no_match (option_mask32 & OPT_W)
139#define FLAG_c (option_mask32 & OPT_c)
140#define FLAG_R (option_mask32 & OPT_R)
141
142
143static void qprintf(const char *fmt UNUSED_PARAM, ...)
144{
145 /* quiet, do nothing */
146}
147
148static void inc_err(void)
149{
150 nerr++;
151 if (nerr > 9 && !FLAG_d_debug) {
152 bb_error_msg_and_die("exiting after 10 errors");
153 }
154}
155
156static void add_exclude(const char *directory)
157{
158 struct stat sb;
159 size_t len;
160
161 if (directory == NULL || directory[0] != '/') {
162 bb_error_msg_and_die("full path required for exclude: %s", directory);
163 }
164 if (lstat(directory, &sb)) {
165 bb_error_msg("directory \"%s\" not found, ignoring", directory);
166 return;
167 }
168 if ((sb.st_mode & S_IFDIR) == 0) {
169 bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
170 directory, sb.st_mode);
171 return;
172 }
173 if (excludeCtr == MAX_EXCLUDES) {
174 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
175 }
176
177 len = strlen(directory);
178 while (len > 1 && directory[len - 1] == '/') {
179 len--;
180 }
181 excludeArray[excludeCtr].directory = xstrndup(directory, len);
182 excludeArray[excludeCtr++].size = len;
183}
184
185static bool exclude(const char *file)
186{
187 int i = 0;
188 for (i = 0; i < excludeCtr; i++) {
189 if (strncmp(file, excludeArray[i].directory,
190 excludeArray[i].size) == 0) {
191 if (file[excludeArray[i].size] == '\0'
192 || file[excludeArray[i].size] == '/') {
193 return 1;
194 }
195 }
196 }
197 return 0;
198}
199
200static int match(const char *name, struct stat *sb, char **con)
201{
202 int ret;
203 char path[PATH_MAX + 1];
204 char *tmp_path = xstrdup(name);
205
206 if (excludeCtr > 0 && exclude(name)) {
207 goto err;
208 }
209 ret = lstat(name, sb);
210 if (ret) {
211 if (FLAG_i_ignore_enoent && errno == ENOENT) {
212 free(tmp_path);
213 return 0;
214 }
215 bb_error_msg("stat(%s)", name);
216 goto err;
217 }
218
219 if (expand_realpath) {
220 if (S_ISLNK(sb->st_mode)) {
221 char *p = NULL;
222 char *file_sep;
223
224 size_t len = 0;
225
226 if (verbose > 1)
227 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
228
229 file_sep = strrchr(tmp_path, '/');
230 if (file_sep == tmp_path) {
231 file_sep++;
232 path[0] = '\0';
233 p = path;
234 } else if (file_sep) {
235 *file_sep++ = '\0';
236 p = realpath(tmp_path, path);
237 } else {
238 file_sep = tmp_path;
239 p = realpath("./", path);
240 }
241 if (p)
242 len = strlen(p);
243 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
244 bb_perror_msg("realpath(%s) failed", name);
245 goto err;
246 }
247 p += len;
248 /* ensure trailing slash of directory name */
249 if (len == 0 || p[-1] != '/') {
250 *p++ = '/';
251 }
252 strcpy(p, file_sep);
253 name = path;
254 if (excludeCtr > 0 && exclude(name))
255 goto err;
256 } else {
257 char *p;
258 p = realpath(name, path);
259 if (!p) {
260 bb_perror_msg("realpath(%s)", name);
261 goto err;
262 }
263 name = p;
264 if (excludeCtr > 0 && exclude(name))
265 goto err;
266 }
267 }
268
269 /* name will be what is matched in the policy */
270 if (NULL != rootpath) {
271 if (0 != strncmp(rootpath, name, rootpathlen)) {
272 bb_error_msg("%s is not located in %s",
273 name, rootpath);
274 goto err;
275 }
276 name += rootpathlen;
277 }
278
279 free(tmp_path);
280 if (rootpath != NULL && name[0] == '\0')
281 /* this is actually the root dir of the alt root */
282 return matchpathcon_index("/", sb->st_mode, con);
283 return matchpathcon_index(name, sb->st_mode, con);
284 err:
285 free(tmp_path);
286 return -1;
287}
288
289/* Compare two contexts to see if their differences are "significant",
290 * or whether the only difference is in the user. */
291static bool only_changed_user(const char *a, const char *b)
292{
293 if (FLAG_F_force)
294 return 0;
295 if (!a || !b)
296 return 0;
297 a = strchr(a, ':'); /* Rest of the context after the user */
298 b = strchr(b, ':');
299 if (!a || !b)
300 return 0;
301 return (strcmp(a, b) == 0);
302}
303
304static int restore(const char *file)
305{
306 char *my_file;
307 struct stat my_sb;
308 int i, j, ret;
309 char *context = NULL;
310 char *newcon = NULL;
311 bool user_only_changed = 0;
312 int retval = 0;
313
314 my_file = bb_simplify_path(file);
315
316 i = match(my_file, &my_sb, &newcon);
317
318 if (i < 0) /* No matching specification. */
319 goto out;
320
321 if (FLAG_p_progress) {
322 count++;
323 if (count % 0x400 == 0) { /* every 1024 times */
324 count = (count % (80*0x400));
325 if (count == 0)
326 bb_putchar('\n');
327 bb_putchar('*');
328 fflush_all();
329 }
330 }
331
332 /*
333 * Try to add an association between this inode and
334 * this specification. If there is already an association
335 * for this inode and it conflicts with this specification,
336 * then use the last matching specification.
337 */
338 if (add_assoc) {
339 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
340 if (j < 0)
341 goto err;
342
343 if (j != i) {
344 /* There was already an association and it took precedence. */
345 goto out;
346 }
347 }
348
349 if (FLAG_d_debug)
350 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
351
352 /* Get the current context of the file. */
353 ret = lgetfilecon_raw(my_file, &context);
354 if (ret < 0) {
355 if (errno == ENODATA) {
356 context = NULL; /* paranoia */
357 } else {
358 bb_perror_msg("lgetfilecon_raw on %s", my_file);
359 goto err;
360 }
361 user_only_changed = 0;
362 } else
363 user_only_changed = only_changed_user(context, newcon);
364
365 /*
366 * Do not relabel the file if the matching specification is
367 * <<none>> or the file is already labeled according to the
368 * specification.
369 */
370 if ((strcmp(newcon, "<<none>>") == 0)
371 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
372 goto out;
373 }
374
375 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
376 if (verbose > 1) {
377 bb_error_msg("skipping %s. %s is customizable_types",
378 my_file, context);
379 }
380 goto out;
381 }
382
383 if (verbose) {
384 /* If we're just doing "-v", trim out any relabels where
385 * the user has changed but the role and type are the
386 * same. For "-vv", emit everything. */
387 if (verbose > 1 || !user_only_changed) {
388 printf("%s: reset %s context %s->%s\n",
389 applet_name, my_file, context ? context : "", newcon);
390 }
391 }
392
393 if (FLAG_l_take_log && !user_only_changed) {
394 if (context)
395 printf("relabeling %s from %s to %s\n", my_file, context, newcon);
396 else
397 printf("labeling %s to %s\n", my_file, newcon);
398 }
399
400 if (outfile && !user_only_changed)
401 fprintf(outfile, "%s\n", my_file);
402
403 /*
404 * Do not relabel the file if -n was used.
405 */
406 if (FLAG_n_dry_run || user_only_changed)
407 goto out;
408
409 /*
410 * Relabel the file to the specified context.
411 */
412 ret = lsetfilecon(my_file, newcon);
413 if (ret) {
414 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
415 goto err;
416 }
417
418 out:
419 freecon(context);
420 freecon(newcon);
421 free(my_file);
422 return retval;
423 err:
424 retval--; /* -1 */
425 goto out;
426}
427
428/*
429 * Apply the last matching specification to a file.
430 * This function is called by recursive_action on each file during
431 * the directory traversal.
432 */
433static int FAST_FUNC apply_spec(
434 const char *file,
435 struct stat *sb,
436 void *userData UNUSED_PARAM,
437 int depth UNUSED_PARAM)
438{
439 if (!follow_mounts) {
440 /* setfiles does not process across different mount points */
441 if (sb->st_dev != dev_id) {
442 return SKIP;
443 }
444 }
445 errors |= restore(file);
446 if (abort_on_error && errors)
447 return FALSE;
448 return TRUE;
449}
450
451
452static int canoncon(const char *path, unsigned lineno, char **contextp)
453{
454 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
455
456 char *tmpcon;
457 char *context = *contextp;
458 int invalid = 0;
459
460#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
461 if (policyfile) {
462 if (sepol_check_context(context) >= 0)
463 return 0;
464 /* Exit immediately if we're in checking mode. */
465 bb_error_msg_and_die(err_msg, path, lineno, context);
466 }
467#endif
468
469 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
470 if (errno != ENOENT) {
471 invalid = 1;
472 inc_err();
473 }
474 } else {
475 free(context);
476 *contextp = tmpcon;
477 }
478
479 if (invalid) {
480 bb_error_msg(err_msg, path, lineno, context);
481 }
482
483 return invalid;
484}
485
486static int process_one(char *name)
487{
488 struct stat sb;
489 int rc;
490
491 rc = lstat(name, &sb);
492 if (rc < 0) {
493 if (FLAG_i_ignore_enoent && errno == ENOENT)
494 return 0;
495 bb_perror_msg("stat(%s)", name);
496 goto err;
497 }
498 dev_id = sb.st_dev;
499
500 if (S_ISDIR(sb.st_mode) && recurse) {
501 if (recursive_action(name,
502 ACTION_RECURSE,
503 apply_spec,
504 apply_spec,
505 NULL, 0) != TRUE
506 ) {
507 bb_error_msg("error while labeling %s", name);
508 goto err;
509 }
510 } else {
511 rc = restore(name);
512 if (rc)
513 goto err;
514 }
515
516 out:
517 if (add_assoc) {
518 if (FLAG_q_quiet)
519 set_matchpathcon_printf(&qprintf);
520 matchpathcon_filespec_eval();
521 set_matchpathcon_printf(NULL);
522 matchpathcon_filespec_destroy();
523 }
524
525 return rc;
526
527 err:
528 rc = -1;
529 goto out;
530}
531
532int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
533int setfiles_main(int argc UNUSED_PARAM, char **argv)
534{
535 struct stat sb;
536 int rc, i = 0;
537 const char *input_filename = NULL;
538 char *buf = NULL;
539 size_t buf_len;
540 int flags;
541 llist_t *exclude_dir = NULL;
542 char *out_filename = NULL;
543
544 INIT_G();
545
546 if (applet_name[0] == 's') { /* "setfiles" */
547 /*
548 * setfiles:
549 * Recursive descent,
550 * Does not expand paths via realpath,
551 * Aborts on errors during the file tree walk,
552 * Try to track inode associations for conflict detection,
553 * Does not follow mounts,
554 * Validates all file contexts at init time.
555 */
556 recurse = 1;
557 abort_on_error = 1;
558 add_assoc = 1;
559 /* follow_mounts = 0; - already is */
560 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
561 } else {
562 /*
563 * restorecon:
564 * No recursive descent unless -r/-R,
565 * Expands paths via realpath,
566 * Do not abort on errors during the file tree walk,
567 * Do not try to track inode associations for conflict detection,
568 * Follows mounts,
569 * Does lazy validation of contexts upon use.
570 */
571 expand_realpath = 1;
572 follow_mounts = 1;
573 matchpathcon_flags = MATCHPATHCON_NOTRANS;
574 /* restorecon only */
575 selinux_or_die();
576 }
577
578 set_matchpathcon_flags(matchpathcon_flags);
579
580 opt_complementary = "e::vv:v--p:p--v:v--q:q--v";
581 /* Option order must match OPT_x definitions! */
582 if (applet_name[0] == 'r') { /* restorecon */
583 flags = getopt32(argv, "de:f:ilnpqrsvo:FWR",
584 &exclude_dir, &input_filename, &out_filename, &verbose);
585 } else { /* setfiles */
586 flags = getopt32(argv, "de:f:ilnpqr:svo:FW"
587 IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
588 &exclude_dir, &input_filename, &rootpath, &out_filename,
589 IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
590 &verbose);
591 }
592 argv += optind;
593
594#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
595 if ((applet_name[0] == 's') && (flags & OPT_c)) {
596 FILE *policystream;
597
598 policystream = xfopen_for_read(policyfile);
599 if (sepol_set_policydb_from_file(policystream) < 0) {
600 bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile);
601 }
602 fclose(policystream);
603
604 /* Only process the specified file_contexts file, not
605 * any .homedirs or .local files, and do not perform
606 * context translations. */
607 set_matchpathcon_flags(MATCHPATHCON_BASEONLY |
608 MATCHPATHCON_NOTRANS |
609 MATCHPATHCON_VALIDATE);
610 }
611#endif
612
613 while (exclude_dir)
614 add_exclude(llist_pop(&exclude_dir));
615
616 if (flags & OPT_o) {
617 outfile = stdout;
618 if (NOT_LONE_CHAR(out_filename, '-')) {
619 outfile = xfopen_for_write(out_filename);
620 }
621 }
622 if (applet_name[0] == 'r') { /* restorecon */
623 if (flags & (OPT_r | OPT_R))
624 recurse = 1;
625 } else { /* setfiles */
626 if (flags & OPT_r)
627 rootpathlen = strlen(rootpath);
628 }
629 if (flags & OPT_s) {
630 input_filename = "-";
631 add_assoc = 0;
632 }
633
634 if (applet_name[0] == 's') { /* setfiles */
635 /* Use our own invalid context checking function so that
636 * we can support either checking against the active policy or
637 * checking against a binary policy file. */
638 set_matchpathcon_canoncon(&canoncon);
639 if (!argv[0])
640 bb_show_usage();
641 xstat(argv[0], &sb);
642 if (!S_ISREG(sb.st_mode)) {
643 bb_error_msg_and_die("spec file %s is not a regular file", argv[0]);
644 }
645 /* Load the file contexts configuration and check it. */
646 rc = matchpathcon_init(argv[0]);
647 if (rc < 0) {
648 bb_simple_perror_msg_and_die(argv[0]);
649 }
650 if (nerr)
651 exit(EXIT_FAILURE);
652 argv++;
653 }
654
655 if (input_filename) {
656 ssize_t len;
657 FILE *f = stdin;
658
659 if (NOT_LONE_CHAR(input_filename, '-'))
660 f = xfopen_for_read(input_filename);
661 while ((len = getline(&buf, &buf_len, f)) > 0) {
662 buf[len - 1] = '\0';
663 errors |= process_one(buf);
664 }
665 if (ENABLE_FEATURE_CLEAN_UP)
666 fclose_if_not_stdin(f);
667 } else {
668 if (!argv[0])
669 bb_show_usage();
670 for (i = 0; argv[i]; i++) {
671 errors |= process_one(argv[i]);
672 }
673 }
674
675 if (FLAG_W_warn_no_match)
676 matchpathcon_checkmatches(argv[0]);
677
678 if (ENABLE_FEATURE_CLEAN_UP && outfile)
679 fclose(outfile);
680
681 return errors;
682}
Note: See TracBrowser for help on using the repository browser.