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>
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"
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"
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"
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"
49 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
50 #include <sepol/sepol.h>
53 #define MAX_EXCLUDES 50
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 */
78 struct edir excludeArray[MAX_EXCLUDES];
80 #define G (*(struct globals*)bb_common_bufsiz1)
81 void 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 */ \
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 )
106 /* Must match getopt32 string! */
122 OPT_c = (1 << 14), /* c only for setfiles */
123 OPT_R = (1 << 14), /* R only for restorecon */
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)
143 static void qprintf(const char *fmt UNUSED_PARAM, ...)
145 /* quiet, do nothing */
148 static void inc_err(void)
151 if (nerr > 9 && !FLAG_d_debug) {
152 bb_error_msg_and_die("exiting after 10 errors");
156 static void add_exclude(const char *directory)
161 if (directory == NULL || directory[0] != '/') {
162 bb_error_msg_and_die("full path required for exclude: %s", directory);
164 if (lstat(directory, &sb)) {
165 bb_error_msg("directory \"%s\" not found, ignoring", directory);
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);
173 if (excludeCtr == MAX_EXCLUDES) {
174 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
177 len = strlen(directory);
178 while (len > 1 && directory[len - 1] == '/') {
181 excludeArray[excludeCtr].directory = xstrndup(directory, len);
182 excludeArray[excludeCtr++].size = len;
185 static bool exclude(const char *file)
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] == '/') {
200 static int match(const char *name, struct stat *sb, char **con)
203 char path[PATH_MAX + 1];
204 char *tmp_path = xstrdup(name);
206 if (excludeCtr > 0 && exclude(name)) {
209 ret = lstat(name, sb);
211 if (FLAG_i_ignore_enoent && errno == ENOENT) {
215 bb_error_msg("stat(%s)", name);
219 if (expand_realpath) {
220 if (S_ISLNK(sb->st_mode)) {
227 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
229 file_sep = strrchr(tmp_path, '/');
230 if (file_sep == tmp_path) {
234 } else if (file_sep) {
236 p = realpath(tmp_path, path);
239 p = realpath("./", path);
243 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
244 bb_perror_msg("realpath(%s) failed", name);
248 /* ensure trailing slash of directory name */
249 if (len == 0 || p[-1] != '/') {
254 if (excludeCtr > 0 && exclude(name))
258 p = realpath(name, path);
260 bb_perror_msg("realpath(%s)", name);
264 if (excludeCtr > 0 && exclude(name))
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",
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);
289 /* Compare two contexts to see if their differences are "significant",
290 * or whether the only difference is in the user. */
291 static bool only_changed_user(const char *a, const char *b)
297 a = strchr(a, ':'); /* Rest of the context after the user */
301 return (strcmp(a, b) == 0);
304 static int restore(const char *file)
309 char *context = NULL;
311 bool user_only_changed = 0;
314 my_file = bb_simplify_path(file);
316 i = match(my_file, &my_sb, &newcon);
318 if (i < 0) /* No matching specification. */
321 if (FLAG_p_progress) {
323 if (count % 0x400 == 0) { /* every 1024 times */
324 count = (count % (80*0x400));
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.
339 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
344 /* There was already an association and it took precedence. */
350 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
352 /* Get the current context of the file. */
353 ret = lgetfilecon_raw(my_file, &context);
355 if (errno == ENODATA) {
356 context = NULL; /* paranoia */
358 bb_perror_msg("lgetfilecon_raw on %s", my_file);
361 user_only_changed = 0;
363 user_only_changed = only_changed_user(context, newcon);
366 * Do not relabel the file if the matching specification is
367 * <<none>> or the file is already labeled according to the
370 if ((strcmp(newcon, "<<none>>") == 0)
371 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
375 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
377 bb_error_msg("skipping %s. %s is customizable_types",
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);
393 if (FLAG_l_take_log && !user_only_changed) {
395 printf("relabeling %s from %s to %s\n", my_file, context, newcon);
397 printf("labeling %s to %s\n", my_file, newcon);
400 if (outfile && !user_only_changed)
401 fprintf(outfile, "%s\n", my_file);
404 * Do not relabel the file if -n was used.
406 if (FLAG_n_dry_run || user_only_changed)
410 * Relabel the file to the specified context.
412 ret = lsetfilecon(my_file, newcon);
414 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
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.
433 static int FAST_FUNC apply_spec(
436 void *userData UNUSED_PARAM,
437 int depth UNUSED_PARAM)
439 if (!follow_mounts) {
440 /* setfiles does not process across different mount points */
441 if (sb->st_dev != dev_id) {
445 errors |= restore(file);
446 if (abort_on_error && errors)
452 static int canoncon(const char *path, unsigned lineno, char **contextp)
454 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
457 char *context = *contextp;
460 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
462 if (sepol_check_context(context) >= 0)
464 /* Exit immediately if we're in checking mode. */
465 bb_error_msg_and_die(err_msg, path, lineno, context);
469 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
470 if (errno != ENOENT) {
480 bb_error_msg(err_msg, path, lineno, context);
486 static int process_one(char *name)
491 rc = lstat(name, &sb);
493 if (FLAG_i_ignore_enoent && errno == ENOENT)
495 bb_perror_msg("stat(%s)", name);
500 if (S_ISDIR(sb.st_mode) && recurse) {
501 if (recursive_action(name,
507 bb_error_msg("error while labeling %s", name);
519 set_matchpathcon_printf(&qprintf);
520 matchpathcon_filespec_eval();
521 set_matchpathcon_printf(NULL);
522 matchpathcon_filespec_destroy();
532 int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
533 int setfiles_main(int argc UNUSED_PARAM, char **argv)
537 const char *input_filename = NULL;
541 llist_t *exclude_dir = NULL;
542 char *out_filename = NULL;
546 if (applet_name[0] == 's') { /* "setfiles" */
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.
559 /* follow_mounts = 0; - already is */
560 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
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,
569 * Does lazy validation of contexts upon use.
573 matchpathcon_flags = MATCHPATHCON_NOTRANS;
574 /* restorecon only */
578 set_matchpathcon_flags(matchpathcon_flags);
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,)
594 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
595 if ((applet_name[0] == 's') && (flags & OPT_c)) {
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);
602 fclose(policystream);
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);
614 add_exclude(llist_pop(&exclude_dir));
618 if (NOT_LONE_CHAR(out_filename, '-')) {
619 outfile = xfopen_for_write(out_filename);
622 if (applet_name[0] == 'r') { /* restorecon */
623 if (flags & (OPT_r | OPT_R))
625 } else { /* setfiles */
627 rootpathlen = strlen(rootpath);
630 input_filename = "-";
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);
642 if (!S_ISREG(sb.st_mode)) {
643 bb_error_msg_and_die("spec file %s is not a regular file", argv[0]);
645 /* Load the file contexts configuration and check it. */
646 rc = matchpathcon_init(argv[0]);
648 bb_simple_perror_msg_and_die(argv[0]);
655 if (input_filename) {
659 if (NOT_LONE_CHAR(input_filename, '-'))
660 f = xfopen_for_read(input_filename);
661 while ((len = getline(&buf, &buf_len, f)) > 0) {
663 errors |= process_one(buf);
665 if (ENABLE_FEATURE_CLEAN_UP)
666 fclose_if_not_stdin(f);
670 for (i = 0; argv[i]; i++) {
671 errors |= process_one(argv[i]);
675 if (FLAG_W_warn_no_match)
676 matchpathcon_checkmatches(argv[0]);
678 if (ENABLE_FEATURE_CLEAN_UP && outfile)