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>
8 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
9 #include <sepol/sepol.h>
12 #define MAX_EXCLUDES 50
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 */
37 struct edir excludeArray[MAX_EXCLUDES];
40 #define G (*(struct globals*)&bb_common_bufsiz1)
41 void 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 */ \
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 )
65 /* Must match getopt32 string! */
81 OPT_c = (1 << 14), /* c only for setfiles */
82 OPT_R = (1 << 14), /* R only for restorecon */
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)
102 static void qprintf(const char *fmt, ...)
104 /* quiet, do nothing */
107 static void inc_err(void)
110 if (nerr > 9 && !FLAG_d_debug) {
111 bb_error_msg_and_die("exiting after 10 errors");
115 static void add_exclude(const char *const directory)
120 if (directory == NULL || directory[0] != '/') {
121 bb_error_msg_and_die("full path required for exclude: %s", directory);
124 if (lstat(directory, &sb)) {
125 bb_error_msg("directory \"%s\" not found, ignoring", directory);
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);
133 if (excludeCtr == MAX_EXCLUDES) {
134 bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
137 len = strlen(directory);
138 while (len > 1 && directory[len - 1] == '/') {
141 excludeArray[excludeCtr].directory = xstrndup(directory, len);
142 excludeArray[excludeCtr++].size = len;
145 static bool exclude(const char *file)
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] == '/') {
160 static int match(const char *name, struct stat *sb, char **con)
163 char path[PATH_MAX + 1];
164 char *tmp_path = xstrdup(name);
166 if (excludeCtr > 0 && exclude(name)) {
169 ret = lstat(name, sb);
171 if (FLAG_i_ignore_enoent && errno == ENOENT) {
175 bb_error_msg("stat(%s)", name);
179 if (expand_realpath) {
180 if (S_ISLNK(sb->st_mode)) {
187 bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
189 file_sep = strrchr(tmp_path, '/');
190 if (file_sep == tmp_path) {
194 } else if (file_sep) {
196 p = realpath(tmp_path, path);
199 p = realpath("./", path);
203 if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
204 bb_perror_msg("realpath(%s) failed", name);
208 /* ensure trailing slash of directory name */
209 if (len == 0 || p[-1] != '/') {
214 if (excludeCtr > 0 && exclude(name))
219 p = realpath(name, path);
221 bb_perror_msg("realpath(%s)", name);
225 if (excludeCtr > 0 && exclude(name))
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",
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);
250 /* Compare two contexts to see if their differences are "significant",
251 * or whether the only difference is in the user. */
252 static bool only_changed_user(const char *a, const char *b)
258 a = strchr(a, ':'); /* Rest of the context after the user */
262 return (strcmp(a, b) == 0);
265 static int restore(const char *file)
270 char *context = NULL;
272 bool user_only_changed = 0;
275 my_file = bb_simplify_path(file);
277 i = match(my_file, &my_sb, &newcon);
279 if (i < 0) /* No matching specification. */
282 if (FLAG_p_progress) {
284 if (count % 0x400 == 0) { /* every 1024 times */
285 count = (count % (80*0x400));
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.
300 j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
305 /* There was already an association and it took precedence. */
311 printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
313 /* Get the current context of the file. */
314 ret = lgetfilecon_raw(my_file, &context);
316 if (errno == ENODATA) {
317 context = NULL; /* paranoia */
319 bb_perror_msg("lgetfilecon_raw on %s", my_file);
322 user_only_changed = 0;
324 user_only_changed = only_changed_user(context, newcon);
327 * Do not relabel the file if the matching specification is
328 * <<none>> or the file is already labeled according to the
331 if ((strcmp(newcon, "<<none>>") == 0)
332 || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
336 if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
338 bb_error_msg("skipping %s. %s is customizable_types",
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);
354 if (FLAG_l_take_log && !user_only_changed) {
356 bb_info_msg("relabeling %s from %s to %s", my_file, context, newcon);
358 bb_info_msg("labeling %s to %s", my_file, newcon);
361 if (outfile && !user_only_changed)
362 fprintf(outfile, "%s\n", my_file);
365 * Do not relabel the file if -n was used.
367 if (FLAG_n_dry_run || user_only_changed)
371 * Relabel the file to the specified context.
373 ret = lsetfilecon(my_file, newcon);
375 bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
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.
394 static int apply_spec(const char *file,
395 struct stat *sb, void *userData, int depth)
397 if (!follow_mounts) {
398 /* setfiles does not process across different mount points */
399 if (sb->st_dev != dev_id) {
403 errors |= restore(file);
404 if (abort_on_error && errors)
410 static int canoncon(const char *path, unsigned lineno, char **contextp)
412 static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
415 char *context = *contextp;
418 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
420 if (sepol_check_context(context) >= 0)
422 /* Exit immediately if we're in checking mode. */
423 bb_error_msg_and_die(err_msg, path, lineno, context);
427 if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
428 if (errno != ENOENT) {
438 bb_error_msg(err_msg, path, lineno, context);
444 static int process_one(char *name)
449 rc = lstat(name, &sb);
451 if (FLAG_i_ignore_enoent && errno == ENOENT)
453 bb_perror_msg("stat(%s)", name);
458 if (S_ISDIR(sb.st_mode) && recurse) {
459 if (recursive_action(name,
464 bb_error_msg("error while labeling %s", name);
476 set_matchpathcon_printf(&qprintf);
477 matchpathcon_filespec_eval();
478 set_matchpathcon_printf(NULL);
479 matchpathcon_filespec_destroy();
489 int setfiles_main(int argc, char **argv);
490 int setfiles_main(int argc, char **argv)
494 const char *input_filename = NULL;
498 llist_t *exclude_dir = NULL;
499 char *out_filename = NULL;
503 if (applet_name[0] == 's') { /* "setfiles" */
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.
516 /* follow_mounts = 0; - already is */
517 matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
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,
526 * Does lazy validation of contexts upon use.
530 matchpathcon_flags = MATCHPATHCON_NOTRANS;
531 /* restorecon only */
535 set_matchpathcon_flags(matchpathcon_flags);
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,)
550 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
551 if ((applet_name[0] == 's') && (flags & OPT_c)) {
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);
558 fclose(policystream);
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);
570 add_exclude(llist_pop(&exclude_dir));
574 if (NOT_LONE_CHAR(out_filename, '-')) {
575 outfile = xfopen(out_filename, "w");
578 if (applet_name[0] == 'r') { /* restorecon */
579 if (flags & (OPT_r | OPT_R))
581 } else { /* setfiles */
583 rootpathlen = strlen(rootpath);
586 input_filename = "-";
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);
597 if (stat(argv[optind], &sb) < 0) {
598 bb_perror_msg_and_die("%s", argv[optind]);
600 if (!S_ISREG(sb.st_mode)) {
601 bb_error_msg_and_die("spec file %s is not a regular file", argv[optind]);
603 /* Load the file contexts configuration and check it. */
604 rc = matchpathcon_init(argv[optind]);
606 bb_perror_msg_and_die("%s", argv[optind]);
615 if (input_filename) {
619 if (NOT_LONE_CHAR(input_filename, '-'))
620 f = xfopen(input_filename, "r");
621 while ((len = getline(&buf, &buf_len, f)) > 0) {
623 errors |= process_one(buf);
625 if (ENABLE_FEATURE_CLEAN_UP)
626 fclose_if_not_stdin(f);
630 for (i = optind; i < argc; i++) {
631 errors |= process_one(argv[i]);
635 if (FLAG_W_warn_no_match)
636 matchpathcon_checkmatches(argv[0]);
638 if (ENABLE_FEATURE_CLEAN_UP && outfile)