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>
6 //config:config SETFILES
7 //config: bool "setfiles"
9 //config: depends on SELINUX
11 //config: Enable support to modify to relabel files.
12 //config: Notice: If you built libselinux with -D_FILE_OFFSET_BITS=64,
13 //config: (It is default in libselinux's Makefile), you _must_ enable
16 //config:config FEATURE_SETFILES_CHECK_OPTION
17 //config: bool "Enable check option"
19 //config: depends on SETFILES
21 //config: Support "-c" option (check the validity of the contexts against
22 //config: the specified binary policy) for setfiles. Requires libsepol.
24 //config:config RESTORECON
25 //config: bool "restorecon"
27 //config: depends on SELINUX
29 //config: Enable support to relabel files. The feature is almost
30 //config: the same as setfiles, but usage is a little different.
32 //applet:IF_SETFILES(APPLET(setfiles, BB_DIR_SBIN, BB_SUID_DROP))
33 //applet:IF_RESTORECON(APPLET_ODDNAME(restorecon, setfiles, BB_DIR_SBIN, BB_SUID_DROP, restorecon))
35 //kbuild:lib-$(CONFIG_SETFILES) += setfiles.o
36 //kbuild:lib-$(CONFIG_RESTORECON) += setfiles.o
38 //usage:#define setfiles_trivial_usage
39 //usage: "[-dnpqsvW] [-e DIR]... [-o FILE] [-r alt_root_path]"
40 //usage: IF_FEATURE_SETFILES_CHECK_OPTION(
41 //usage: " [-c policyfile] spec_file"
44 //usage:#define setfiles_full_usage "\n\n"
45 //usage: "Reset file contexts under pathname according to spec_file\n"
46 //usage: IF_FEATURE_SETFILES_CHECK_OPTION(
47 //usage: "\n -c FILE Check the validity of the contexts against the specified binary policy"
49 //usage: "\n -d Show which specification matched each file"
50 //usage: "\n -l Log changes in file labels to syslog"
51 //TODO: log to syslog is not yet implemented, it goes to stdout only now
52 //usage: "\n -n Don't change any file labels"
53 //usage: "\n -q Suppress warnings"
54 //usage: "\n -r DIR Use an alternate root path"
55 //usage: "\n -e DIR Exclude DIR"
56 //usage: "\n -F Force reset of context to match file_context for customizable files"
57 //usage: "\n -o FILE Save list of files with incorrect context"
58 //usage: "\n -s Take a list of files from stdin (instead of command line)"
59 //usage: "\n -v Show changes in file labels, if type or role are changing"
60 //usage: "\n -vv Show changes in file labels, if type, role, or user are changing"
61 //usage: "\n -W Display warnings about entries that had no matching files"
63 //usage:#define restorecon_trivial_usage
64 //usage: "[-iFnRv] [-e EXCLUDEDIR]... [-o FILE] [-f FILE]"
65 //usage:#define restorecon_full_usage "\n\n"
66 //usage: "Reset security contexts of files in pathname\n"
67 //usage: "\n -i Ignore files that don't exist"
68 //usage: "\n -f FILE File with list of files to process"
69 //usage: "\n -e DIR Directory to exclude"
70 //usage: "\n -R,-r Recurse"
71 //usage: "\n -n Don't change any file labels"
72 //usage: "\n -o FILE Save list of files with incorrect context"
73 //usage: "\n -v Verbose"
74 //usage: "\n -vv Show changed labels"
75 //usage: "\n -F Force reset of context to match file_context"
76 //usage: "\n for customizable files, or the user section,"
77 //usage: "\n if it has changed"
80 #include "common_bufsiz.h"
81 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
82 #include <sepol/sepol.h>
85 #define MAX_EXCLUDES 50
100 int verbose; /* getopt32 uses it, has to be int */
101 smallint recurse; /* Recursive descent */
102 smallint follow_mounts;
103 /* Behavior flags determined based on setfiles vs. restorecon */
104 smallint expand_realpath; /* Expand paths via realpath */
105 smallint abort_on_error; /* Abort the file tree walk upon an error */
106 int add_assoc; /* Track inode associations for conflict detection */
107 int matchpathcon_flags; /* Flags to matchpathcon */
108 dev_t dev_id; /* Device id where target file exists */
110 struct edir excludeArray[MAX_EXCLUDES];
112 #define G (*(struct globals*)bb_common_bufsiz1)
113 void BUG_setfiles_globals_too_big(void);
114 #define INIT_G() do { \
115 setup_common_bufsiz(); \
116 if (sizeof(G) > COMMON_BUFSIZE) \
117 BUG_setfiles_globals_too_big(); \
118 /* memset(&G, 0, sizeof(G)); - already is */ \
120 #define outfile (G.outfile )
121 #define policyfile (G.policyfile )
122 #define rootpath (G.rootpath )
123 #define rootpathlen (G.rootpathlen )
124 #define count (G.count )
125 #define excludeCtr (G.excludeCtr )
126 #define errors (G.errors )
127 #define verbose (G.verbose )
128 #define recurse (G.recurse )
129 #define follow_mounts (G.follow_mounts )
130 #define expand_realpath (G.expand_realpath )
131 #define abort_on_error (G.abort_on_error )
132 #define add_assoc (G.add_assoc )
133 #define matchpathcon_flags (G.matchpathcon_flags)
134 #define dev_id (G.dev_id )
135 #define nerr (G.nerr )
136 #define excludeArray (G.excludeArray )
138 /* Must match getopt32 string! */
154 OPT_c = (1 << 14), /* c only for setfiles */
155 OPT_R = (1 << 14), /* R only for restorecon */
157 #define FLAG_d_debug (option_mask32 & OPT_d)
158 #define FLAG_e (option_mask32 & OPT_e)
159 #define FLAG_f (option_mask32 & OPT_f)
160 #define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
161 #define FLAG_l_take_log (option_mask32 & OPT_l)
162 #define FLAG_n_dry_run (option_mask32 & OPT_n)
163 #define FLAG_p_progress (option_mask32 & OPT_p)
164 #define FLAG_q_quiet (option_mask32 & OPT_q)
165 #define FLAG_r (option_mask32 & OPT_r)
166 #define FLAG_s (option_mask32 & OPT_s)
167 #define FLAG_v (option_mask32 & OPT_v)
168 #define FLAG_o (option_mask32 & OPT_o)
169 #define FLAG_F_force (option_mask32 & OPT_F)
170 #define FLAG_W_warn_no_match (option_mask32 & OPT_W)
171 #define FLAG_c (option_mask32 & OPT_c)
172 #define FLAG_R (option_mask32 & OPT_R)
175 static void qprintf(const char *fmt UNUSED_PARAM, ...)
177 /* quiet, do nothing */
180 static void inc_err(void)
183 if (nerr > 9 && !FLAG_d_debug) {
184 bb_error_msg_and_die("exiting after 10 errors");
188 static void add_exclude(const char *directory)
193 if (directory == NULL || directory[0] != '/') {
194 bb_error_msg_and_die("full path required for exclude: %s", directory);
196 if (lstat(directory, &sb)) {
197 bb_error_msg("directory \"%s\" not found, ignoring", directory);
200 if ((sb.st_mode & S_IFDIR) == 0) {
201 bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
202 directory, sb.st_mode);
205 if (excludeCtr == MAX_EXCLUDES) {
206 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
209 len = strlen(directory);
210 while (len > 1 && directory[len - 1] == '/') {
213 excludeArray[excludeCtr].directory = xstrndup(directory, len);
214 excludeArray[excludeCtr++].size = len;
217 static bool exclude(const char *file)
220 for (i = 0; i < excludeCtr; i++) {
221 if (strncmp(file, excludeArray[i].directory,
222 excludeArray[i].size) == 0) {
223 if (file[excludeArray[i].size] == '\0'
224 || file[excludeArray[i].size] == '/') {
232 static int match(const char *name, struct stat *sb, char **con)
235 char path[PATH_MAX + 1];
236 char *tmp_path = xstrdup(name);
238 if (excludeCtr > 0 && exclude(name)) {
241 ret = lstat(name, sb);
243 if (FLAG_i_ignore_enoent && errno == ENOENT) {
247 bb_error_msg("stat(%s)", name);
251 if (expand_realpath) {
252 if (S_ISLNK(sb->st_mode)) {
259 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
261 file_sep = strrchr(tmp_path, '/');
262 if (file_sep == tmp_path) {
266 } else if (file_sep) {
268 p = realpath(tmp_path, path);
271 p = realpath("./", path);
275 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
276 bb_perror_msg("realpath(%s) failed", name);
280 /* ensure trailing slash of directory name */
281 if (len == 0 || p[-1] != '/') {
286 if (excludeCtr > 0 && exclude(name))
290 p = realpath(name, path);
292 bb_perror_msg("realpath(%s)", name);
296 if (excludeCtr > 0 && exclude(name))
301 /* name will be what is matched in the policy */
302 if (NULL != rootpath) {
303 if (0 != strncmp(rootpath, name, rootpathlen)) {
304 bb_error_msg("%s is not located in %s",
312 if (rootpath != NULL && name[0] == '\0')
313 /* this is actually the root dir of the alt root */
314 return matchpathcon_index("/", sb->st_mode, con);
315 return matchpathcon_index(name, sb->st_mode, con);
321 /* Compare two contexts to see if their differences are "significant",
322 * or whether the only difference is in the user. */
323 static bool only_changed_user(const char *a, const char *b)
329 a = strchr(a, ':'); /* Rest of the context after the user */
333 return (strcmp(a, b) == 0);
336 static int restore(const char *file)
341 char *context = NULL;
343 bool user_only_changed = 0;
346 my_file = bb_simplify_path(file);
348 i = match(my_file, &my_sb, &newcon);
350 if (i < 0) /* No matching specification. */
353 if (FLAG_p_progress) {
355 if (count % 0x400 == 0) { /* every 1024 times */
356 count = (count % (80*0x400));
365 * Try to add an association between this inode and
366 * this specification. If there is already an association
367 * for this inode and it conflicts with this specification,
368 * then use the last matching specification.
371 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
376 /* There was already an association and it took precedence. */
382 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
384 /* Get the current context of the file. */
385 ret = lgetfilecon_raw(my_file, &context);
387 if (errno == ENODATA) {
388 context = NULL; /* paranoia */
390 bb_perror_msg("lgetfilecon_raw on %s", my_file);
393 user_only_changed = 0;
395 user_only_changed = only_changed_user(context, newcon);
398 * Do not relabel the file if the matching specification is
399 * <<none>> or the file is already labeled according to the
402 if ((strcmp(newcon, "<<none>>") == 0)
403 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
407 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
409 bb_error_msg("skipping %s. %s is customizable_types",
416 /* If we're just doing "-v", trim out any relabels where
417 * the user has changed but the role and type are the
418 * same. For "-vv", emit everything. */
419 if (verbose > 1 || !user_only_changed) {
420 printf("%s: reset %s context %s->%s\n",
421 applet_name, my_file, context ? context : "", newcon);
425 if (FLAG_l_take_log && !user_only_changed) {
427 printf("relabeling %s from %s to %s\n", my_file, context, newcon);
429 printf("labeling %s to %s\n", my_file, newcon);
432 if (outfile && !user_only_changed)
433 fprintf(outfile, "%s\n", my_file);
436 * Do not relabel the file if -n was used.
438 if (FLAG_n_dry_run || user_only_changed)
442 * Relabel the file to the specified context.
444 ret = lsetfilecon(my_file, newcon);
446 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
461 * Apply the last matching specification to a file.
462 * This function is called by recursive_action on each file during
463 * the directory traversal.
465 static int FAST_FUNC apply_spec(
468 void *userData UNUSED_PARAM,
469 int depth UNUSED_PARAM)
471 if (!follow_mounts) {
472 /* setfiles does not process across different mount points */
473 if (sb->st_dev != dev_id) {
477 errors |= restore(file);
478 if (abort_on_error && errors)
484 static int canoncon(const char *path, unsigned lineno, char **contextp)
486 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
489 char *context = *contextp;
492 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
494 if (sepol_check_context(context) >= 0)
496 /* Exit immediately if we're in checking mode. */
497 bb_error_msg_and_die(err_msg, path, lineno, context);
501 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
502 if (errno != ENOENT) {
512 bb_error_msg(err_msg, path, lineno, context);
518 static int process_one(char *name)
523 rc = lstat(name, &sb);
525 if (FLAG_i_ignore_enoent && errno == ENOENT)
527 bb_perror_msg("stat(%s)", name);
532 if (S_ISDIR(sb.st_mode) && recurse) {
533 if (recursive_action(name,
539 bb_error_msg("error while labeling %s", name);
551 set_matchpathcon_printf(&qprintf);
552 matchpathcon_filespec_eval();
553 set_matchpathcon_printf(NULL);
554 matchpathcon_filespec_destroy();
564 int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
565 int setfiles_main(int argc UNUSED_PARAM, char **argv)
569 const char *input_filename = NULL;
573 llist_t *exclude_dir = NULL;
574 char *out_filename = NULL;
578 if (applet_name[0] == 's') { /* "setfiles" */
582 * Does not expand paths via realpath,
583 * Aborts on errors during the file tree walk,
584 * Try to track inode associations for conflict detection,
585 * Does not follow mounts,
586 * Validates all file contexts at init time.
591 /* follow_mounts = 0; - already is */
592 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
596 * No recursive descent unless -r/-R,
597 * Expands paths via realpath,
598 * Do not abort on errors during the file tree walk,
599 * Do not try to track inode associations for conflict detection,
601 * Does lazy validation of contexts upon use.
605 matchpathcon_flags = MATCHPATHCON_NOTRANS;
606 /* restorecon only */
610 set_matchpathcon_flags(matchpathcon_flags);
612 opt_complementary = "vv:v--p:p--v:v--q:q--v";
613 /* Option order must match OPT_x definitions! */
614 if (applet_name[0] == 'r') { /* restorecon */
615 flags = getopt32(argv, "de:*f:ilnpqrsvo:FWR",
616 &exclude_dir, &input_filename, &out_filename, &verbose);
617 } else { /* setfiles */
618 flags = getopt32(argv, "de:*f:ilnpqr:svo:FW"
619 IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
620 &exclude_dir, &input_filename, &rootpath, &out_filename,
621 IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
626 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
627 if ((applet_name[0] == 's') && (flags & OPT_c)) {
630 policystream = xfopen_for_read(policyfile);
631 if (sepol_set_policydb_from_file(policystream) < 0) {
632 bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile);
634 fclose(policystream);
636 /* Only process the specified file_contexts file, not
637 * any .homedirs or .local files, and do not perform
638 * context translations. */
639 set_matchpathcon_flags(MATCHPATHCON_BASEONLY |
640 MATCHPATHCON_NOTRANS |
641 MATCHPATHCON_VALIDATE);
646 add_exclude(llist_pop(&exclude_dir));
650 if (NOT_LONE_CHAR(out_filename, '-')) {
651 outfile = xfopen_for_write(out_filename);
654 if (applet_name[0] == 'r') { /* restorecon */
655 if (flags & (OPT_r | OPT_R))
657 } else { /* setfiles */
659 rootpathlen = strlen(rootpath);
662 input_filename = "-";
666 if (applet_name[0] == 's') { /* setfiles */
667 /* Use our own invalid context checking function so that
668 * we can support either checking against the active policy or
669 * checking against a binary policy file. */
670 set_matchpathcon_canoncon(&canoncon);
674 if (!S_ISREG(sb.st_mode)) {
675 bb_error_msg_and_die("spec file %s is not a regular file", argv[0]);
677 /* Load the file contexts configuration and check it. */
678 rc = matchpathcon_init(argv[0]);
680 bb_simple_perror_msg_and_die(argv[0]);
687 if (input_filename) {
691 if (NOT_LONE_CHAR(input_filename, '-'))
692 f = xfopen_for_read(input_filename);
693 while ((len = getline(&buf, &buf_len, f)) > 0) {
695 errors |= process_one(buf);
697 if (ENABLE_FEATURE_CLEAN_UP)
698 fclose_if_not_stdin(f);
702 for (i = 0; argv[i]; i++) {
703 errors |= process_one(argv[i]);
707 if (FLAG_W_warn_no_match)
708 matchpathcon_checkmatches(argv[0]);
710 if (ENABLE_FEATURE_CLEAN_UP && outfile)