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
,
506 bb_error_msg("error while labeling %s", name
);
518 set_matchpathcon_printf(&qprintf
);
519 matchpathcon_filespec_eval();
520 set_matchpathcon_printf(NULL
);
521 matchpathcon_filespec_destroy();
531 int setfiles_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
532 int setfiles_main(int argc UNUSED_PARAM
, char **argv
)
536 const char *input_filename
= NULL
;
540 llist_t
*exclude_dir
= NULL
;
541 char *out_filename
= NULL
;
545 if (applet_name
[0] == 's') { /* "setfiles" */
549 * Does not expand paths via realpath,
550 * Aborts on errors during the file tree walk,
551 * Try to track inode associations for conflict detection,
552 * Does not follow mounts,
553 * Validates all file contexts at init time.
558 /* follow_mounts = 0; - already is */
559 matchpathcon_flags
= MATCHPATHCON_VALIDATE
| MATCHPATHCON_NOTRANS
;
563 * No recursive descent unless -r/-R,
564 * Expands paths via realpath,
565 * Do not abort on errors during the file tree walk,
566 * Do not try to track inode associations for conflict detection,
568 * Does lazy validation of contexts upon use.
572 matchpathcon_flags
= MATCHPATHCON_NOTRANS
;
573 /* restorecon only */
577 set_matchpathcon_flags(matchpathcon_flags
);
579 opt_complementary
= "e::vv:v--p:p--v:v--q:q--v";
580 /* Option order must match OPT_x definitions! */
581 if (applet_name
[0] == 'r') { /* restorecon */
582 flags
= getopt32(argv
, "de:f:ilnpqrsvo:FWR",
583 &exclude_dir
, &input_filename
, &out_filename
, &verbose
);
584 } else { /* setfiles */
585 flags
= getopt32(argv
, "de:f:ilnpqr:svo:FW"
586 IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
587 &exclude_dir
, &input_filename
, &rootpath
, &out_filename
,
588 IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile
,)
593 #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
594 if ((applet_name
[0] == 's') && (flags
& OPT_c
)) {
597 policystream
= xfopen_for_read(policyfile
);
598 if (sepol_set_policydb_from_file(policystream
) < 0) {
599 bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile
);
601 fclose(policystream
);
603 /* Only process the specified file_contexts file, not
604 * any .homedirs or .local files, and do not perform
605 * context translations. */
606 set_matchpathcon_flags(MATCHPATHCON_BASEONLY
|
607 MATCHPATHCON_NOTRANS
|
608 MATCHPATHCON_VALIDATE
);
613 add_exclude(llist_pop(&exclude_dir
));
617 if (NOT_LONE_CHAR(out_filename
, '-')) {
618 outfile
= xfopen_for_write(out_filename
);
621 if (applet_name
[0] == 'r') { /* restorecon */
622 if (flags
& (OPT_r
| OPT_R
))
624 } else { /* setfiles */
626 rootpathlen
= strlen(rootpath
);
629 input_filename
= "-";
633 if (applet_name
[0] == 's') { /* setfiles */
634 /* Use our own invalid context checking function so that
635 * we can support either checking against the active policy or
636 * checking against a binary policy file. */
637 set_matchpathcon_canoncon(&canoncon
);
641 if (!S_ISREG(sb
.st_mode
)) {
642 bb_error_msg_and_die("spec file %s is not a regular file", argv
[0]);
644 /* Load the file contexts configuration and check it. */
645 rc
= matchpathcon_init(argv
[0]);
647 bb_simple_perror_msg_and_die(argv
[0]);
654 if (input_filename
) {
658 if (NOT_LONE_CHAR(input_filename
, '-'))
659 f
= xfopen_for_read(input_filename
);
660 while ((len
= getline(&buf
, &buf_len
, f
)) > 0) {
662 errors
|= process_one(buf
);
664 if (ENABLE_FEATURE_CLEAN_UP
)
665 fclose_if_not_stdin(f
);
669 for (i
= 0; argv
[i
]; i
++) {
670 errors
|= process_one(argv
[i
]);
674 if (FLAG_W_warn_no_match
)
675 matchpathcon_checkmatches(argv
[0]);
677 if (ENABLE_FEATURE_CLEAN_UP
&& outfile
)