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 //usage: "\n -n Don't change any file labels"
21 //usage: "\n -q Suppress warnings"
22 //usage: "\n -r DIR Use an alternate root path"
23 //usage: "\n -e DIR Exclude DIR"
24 //usage: "\n -F Force reset of context to match file_context for customizable files"
25 //usage: "\n -o FILE Save list of files with incorrect context"
26 //usage: "\n -s Take a list of files from stdin (instead of command line)"
27 //usage: "\n -v Show changes in file labels, if type or role are changing"
28 //usage: "\n -vv Show changes in file labels, if type, role, or user are changing"
29 //usage: "\n -W Display warnings about entries that had no matching files"
31 //usage:#define restorecon_trivial_usage
32 //usage: "[-iFnRv] [-e EXCLUDEDIR]... [-o FILE] [-f FILE]"
33 //usage:#define restorecon_full_usage "\n\n"
34 //usage: "Reset security contexts of files in pathname\n"
35 //usage: "\n -i Ignore files that don't exist"
36 //usage: "\n -f FILE File with list of files to process"
37 //usage: "\n -e DIR Directory to exclude"
38 //usage: "\n -R,-r Recurse"
39 //usage: "\n -n Don't change any file labels"
40 //usage: "\n -o FILE Save list of files with incorrect context"
41 //usage: "\n -v Verbose"
42 //usage: "\n -vv Show changed labels"
43 //usage: "\n -F Force reset of context to match file_context"
44 //usage: "\n for customizable files, or the user section,"
45 //usage: "\n if it has changed"
48 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
49 #include <sepol/sepol.h>
52 #define MAX_EXCLUDES 50
67 int verbose; /* getopt32 uses it, has to be int */
68 smallint recurse; /* Recursive descent */
69 smallint follow_mounts;
70 /* Behavior flags determined based on setfiles vs. restorecon */
71 smallint expand_realpath; /* Expand paths via realpath */
72 smallint abort_on_error; /* Abort the file tree walk upon an error */
73 int add_assoc; /* Track inode associations for conflict detection */
74 int matchpathcon_flags; /* Flags to matchpathcon */
75 dev_t dev_id; /* Device id where target file exists */
77 struct edir excludeArray[MAX_EXCLUDES];
79 #define G (*(struct globals*)&bb_common_bufsiz1)
80 void BUG_setfiles_globals_too_big(void);
81 #define INIT_G() do { \
82 if (sizeof(G) > COMMON_BUFSIZE) \
83 BUG_setfiles_globals_too_big(); \
84 /* memset(&G, 0, sizeof(G)); - already is */ \
86 #define outfile (G.outfile )
87 #define policyfile (G.policyfile )
88 #define rootpath (G.rootpath )
89 #define rootpathlen (G.rootpathlen )
90 #define count (G.count )
91 #define excludeCtr (G.excludeCtr )
92 #define errors (G.errors )
93 #define verbose (G.verbose )
94 #define recurse (G.recurse )
95 #define follow_mounts (G.follow_mounts )
96 #define expand_realpath (G.expand_realpath )
97 #define abort_on_error (G.abort_on_error )
98 #define add_assoc (G.add_assoc )
99 #define matchpathcon_flags (G.matchpathcon_flags)
100 #define dev_id (G.dev_id )
101 #define nerr (G.nerr )
102 #define excludeArray (G.excludeArray )
104 /* Must match getopt32 string! */
120 OPT_c = (1 << 14), /* c only for setfiles */
121 OPT_R = (1 << 14), /* R only for restorecon */
123 #define FLAG_d_debug (option_mask32 & OPT_d)
124 #define FLAG_e (option_mask32 & OPT_e)
125 #define FLAG_f (option_mask32 & OPT_f)
126 #define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
127 #define FLAG_l_take_log (option_mask32 & OPT_l)
128 #define FLAG_n_dry_run (option_mask32 & OPT_n)
129 #define FLAG_p_progress (option_mask32 & OPT_p)
130 #define FLAG_q_quiet (option_mask32 & OPT_q)
131 #define FLAG_r (option_mask32 & OPT_r)
132 #define FLAG_s (option_mask32 & OPT_s)
133 #define FLAG_v (option_mask32 & OPT_v)
134 #define FLAG_o (option_mask32 & OPT_o)
135 #define FLAG_F_force (option_mask32 & OPT_F)
136 #define FLAG_W_warn_no_match (option_mask32 & OPT_W)
137 #define FLAG_c (option_mask32 & OPT_c)
138 #define FLAG_R (option_mask32 & OPT_R)
141 static void qprintf(const char *fmt UNUSED_PARAM, ...)
143 /* quiet, do nothing */
146 static void inc_err(void)
149 if (nerr > 9 && !FLAG_d_debug) {
150 bb_error_msg_and_die("exiting after 10 errors");
154 static void add_exclude(const char *directory)
159 if (directory == NULL || directory[0] != '/') {
160 bb_error_msg_and_die("full path required for exclude: %s", directory);
162 if (lstat(directory, &sb)) {
163 bb_error_msg("directory \"%s\" not found, ignoring", directory);
166 if ((sb.st_mode & S_IFDIR) == 0) {
167 bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
168 directory, sb.st_mode);
171 if (excludeCtr == MAX_EXCLUDES) {
172 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
175 len = strlen(directory);
176 while (len > 1 && directory[len - 1] == '/') {
179 excludeArray[excludeCtr].directory = xstrndup(directory, len);
180 excludeArray[excludeCtr++].size = len;
183 static bool exclude(const char *file)
186 for (i = 0; i < excludeCtr; i++) {
187 if (strncmp(file, excludeArray[i].directory,
188 excludeArray[i].size) == 0) {
189 if (file[excludeArray[i].size] == '\0'
190 || file[excludeArray[i].size] == '/') {
198 static int match(const char *name, struct stat *sb, char **con)
201 char path[PATH_MAX + 1];
202 char *tmp_path = xstrdup(name);
204 if (excludeCtr > 0 && exclude(name)) {
207 ret = lstat(name, sb);
209 if (FLAG_i_ignore_enoent && errno == ENOENT) {
213 bb_error_msg("stat(%s)", name);
217 if (expand_realpath) {
218 if (S_ISLNK(sb->st_mode)) {
225 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
227 file_sep = strrchr(tmp_path, '/');
228 if (file_sep == tmp_path) {
232 } else if (file_sep) {
234 p = realpath(tmp_path, path);
237 p = realpath("./", path);
241 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
242 bb_perror_msg("realpath(%s) failed", name);
246 /* ensure trailing slash of directory name */
247 if (len == 0 || p[-1] != '/') {
252 if (excludeCtr > 0 && exclude(name))
257 p = realpath(name, path);
259 bb_perror_msg("realpath(%s)", name);
263 if (excludeCtr > 0 && exclude(name))
268 /* name will be what is matched in the policy */
269 if (NULL != rootpath) {
270 if (0 != strncmp(rootpath, name, rootpathlen)) {
271 bb_error_msg("%s is not located in %s",
279 if (rootpath != NULL && name[0] == '\0')
280 /* this is actually the root dir of the alt root */
281 return matchpathcon_index("/", sb->st_mode, con);
282 return matchpathcon_index(name, sb->st_mode, con);
288 /* Compare two contexts to see if their differences are "significant",
289 * or whether the only difference is in the user. */
290 static bool only_changed_user(const char *a, const char *b)
296 a = strchr(a, ':'); /* Rest of the context after the user */
300 return (strcmp(a, b) == 0);
303 static int restore(const char *file)
308 char *context = NULL;
310 bool user_only_changed = 0;
313 my_file = bb_simplify_path(file);
315 i = match(my_file, &my_sb, &newcon);
317 if (i < 0) /* No matching specification. */
320 if (FLAG_p_progress) {
322 if (count % 0x400 == 0) { /* every 1024 times */
323 count = (count % (80*0x400));
332 * Try to add an association between this inode and
333 * this specification. If there is already an association
334 * for this inode and it conflicts with this specification,
335 * then use the last matching specification.
338 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
343 /* There was already an association and it took precedence. */
349 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
351 /* Get the current context of the file. */
352 ret = lgetfilecon_raw(my_file, &context);
354 if (errno == ENODATA) {
355 context = NULL; /* paranoia */
357 bb_perror_msg("lgetfilecon_raw on %s", my_file);
360 user_only_changed = 0;
362 user_only_changed = only_changed_user(context, newcon);
365 * Do not relabel the file if the matching specification is
366 * <<none>> or the file is already labeled according to the
369 if ((strcmp(newcon, "<<none>>") == 0)
370 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
374 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
376 bb_error_msg("skipping %s. %s is customizable_types",
383 /* If we're just doing "-v", trim out any relabels where
384 * the user has changed but the role and type are the
385 * same. For "-vv", emit everything. */
386 if (verbose > 1 || !user_only_changed) {
387 bb_info_msg("%s: reset %s context %s->%s",
388 applet_name, my_file, context ? context : "", newcon);
392 if (FLAG_l_take_log && !user_only_changed) {
394 bb_info_msg("relabeling %s from %s to %s", my_file, context, newcon);
396 bb_info_msg("labeling %s to %s", my_file, newcon);
399 if (outfile && !user_only_changed)
400 fprintf(outfile, "%s\n", my_file);
403 * Do not relabel the file if -n was used.
405 if (FLAG_n_dry_run || user_only_changed)
409 * Relabel the file to the specified context.
411 ret = lsetfilecon(my_file, newcon);
413 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
428 * Apply the last matching specification to a file.
429 * This function is called by recursive_action on each file during
430 * the directory traversal.
432 static int FAST_FUNC apply_spec(
435 void *userData UNUSED_PARAM,
436 int depth UNUSED_PARAM)
438 if (!follow_mounts) {
439 /* setfiles does not process across different mount points */
440 if (sb->st_dev != dev_id) {
444 errors |= restore(file);
445 if (abort_on_error && errors)
451 static int canoncon(const char *path, unsigned lineno, char **contextp)
453 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
456 char *context = *contextp;
459 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
461 if (sepol_check_context(context) >= 0)
463 /* Exit immediately if we're in checking mode. */
464 bb_error_msg_and_die(err_msg, path, lineno, context);
468 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
469 if (errno != ENOENT) {
479 bb_error_msg(err_msg, path, lineno, context);
485 static int process_one(char *name)
490 rc = lstat(name, &sb);
492 if (FLAG_i_ignore_enoent && errno == ENOENT)
494 bb_perror_msg("stat(%s)", name);
499 if (S_ISDIR(sb.st_mode) && recurse) {
500 if (recursive_action(name,
505 bb_error_msg("error while labeling %s", name);
517 set_matchpathcon_printf(&qprintf);
518 matchpathcon_filespec_eval();
519 set_matchpathcon_printf(NULL);
520 matchpathcon_filespec_destroy();
530 int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
531 int setfiles_main(int argc UNUSED_PARAM, char **argv)
535 const char *input_filename = NULL;
539 llist_t *exclude_dir = NULL;
540 char *out_filename = NULL;
544 if (applet_name[0] == 's') { /* "setfiles" */
548 * Does not expand paths via realpath,
549 * Aborts on errors during the file tree walk,
550 * Try to track inode associations for conflict detection,
551 * Does not follow mounts,
552 * Validates all file contexts at init time.
557 /* follow_mounts = 0; - already is */
558 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
562 * No recursive descent unless -r/-R,
563 * Expands paths via realpath,
564 * Do not abort on errors during the file tree walk,
565 * Do not try to track inode associations for conflict detection,
567 * Does lazy validation of contexts upon use.
571 matchpathcon_flags = MATCHPATHCON_NOTRANS;
572 /* restorecon only */
576 set_matchpathcon_flags(matchpathcon_flags);
578 opt_complementary = "e::vv:v--p:p--v:v--q:q--v";
579 /* Option order must match OPT_x definitions! */
580 if (applet_name[0] == 'r') { /* restorecon */
581 flags = getopt32(argv, "de:f:ilnpqrsvo:FWR",
582 &exclude_dir, &input_filename, &out_filename, &verbose);
583 } else { /* setfiles */
584 flags = getopt32(argv, "de:f:ilnpqr:svo:FW"
585 IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
586 &exclude_dir, &input_filename, &rootpath, &out_filename,
587 IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
592 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
593 if ((applet_name[0] == 's') && (flags & OPT_c)) {
596 policystream = xfopen_for_read(policyfile);
597 if (sepol_set_policydb_from_file(policystream) < 0) {
598 bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile);
600 fclose(policystream);
602 /* Only process the specified file_contexts file, not
603 any .homedirs or .local files, and do not perform
604 context translations. */
605 set_matchpathcon_flags(MATCHPATHCON_BASEONLY |
606 MATCHPATHCON_NOTRANS |
607 MATCHPATHCON_VALIDATE);
612 add_exclude(llist_pop(&exclude_dir));
616 if (NOT_LONE_CHAR(out_filename, '-')) {
617 outfile = xfopen_for_write(out_filename);
620 if (applet_name[0] == 'r') { /* restorecon */
621 if (flags & (OPT_r | OPT_R))
623 } else { /* setfiles */
625 rootpathlen = strlen(rootpath);
628 input_filename = "-";
632 if (applet_name[0] == 's') { /* setfiles */
633 /* Use our own invalid context checking function so that
634 we can support either checking against the active policy or
635 checking against a binary policy file. */
636 set_matchpathcon_canoncon(&canoncon);
640 if (!S_ISREG(sb.st_mode)) {
641 bb_error_msg_and_die("spec file %s is not a regular file", argv[0]);
643 /* Load the file contexts configuration and check it. */
644 rc = matchpathcon_init(argv[0]);
646 bb_simple_perror_msg_and_die(argv[0]);
653 if (input_filename) {
657 if (NOT_LONE_CHAR(input_filename, '-'))
658 f = xfopen_for_read(input_filename);
659 while ((len = getline(&buf, &buf_len, f)) > 0) {
661 errors |= process_one(buf);
663 if (ENABLE_FEATURE_CLEAN_UP)
664 fclose_if_not_stdin(f);
668 for (i = 0; argv[i]; i++) {
669 errors |= process_one(argv[i]);
673 if (FLAG_W_warn_no_match)
674 matchpathcon_checkmatches(argv[0]);
676 if (ENABLE_FEATURE_CLEAN_UP && outfile)