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/*
* chcon -- change security context, based on coreutils-5.97-13
*
* Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
*
* Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config CHCON
//config: bool "chcon"
//config: default n
//config: depends on SELINUX
//config: help
//config: Enable support to change the security context of file.
//config:
//config:config FEATURE_CHCON_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on CHCON && LONG_OPTS
//applet:IF_CHCON(APPLET(chcon, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_CHCON) += chcon.o
//usage:#define chcon_trivial_usage
//usage: "[OPTIONS] CONTEXT FILE..."
//usage: "\n chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
//usage: IF_FEATURE_CHCON_LONG_OPTIONS(
//usage: "\n chcon [OPTIONS] --reference=RFILE FILE..."
//usage: )
//usage:#define chcon_full_usage "\n\n"
//usage: "Change the security context of each FILE to CONTEXT\n"
//usage: IF_FEATURE_CHCON_LONG_OPTIONS(
//usage: "\n -v,--verbose Verbose"
//usage: "\n -c,--changes Report changes made"
//usage: "\n -h,--no-dereference Affect symlinks instead of their targets"
//usage: "\n -f,--silent,--quiet Suppress most error messages"
//usage: "\n --reference=RFILE Use RFILE's group instead of using a CONTEXT value"
//usage: "\n -u,--user=USER Set user/role/type/range in the target"
//usage: "\n -r,--role=ROLE security context"
//usage: "\n -t,--type=TYPE"
//usage: "\n -l,--range=RANGE"
//usage: "\n -R,--recursive Recurse"
//usage: )
//usage: IF_NOT_FEATURE_CHCON_LONG_OPTIONS(
//usage: "\n -v Verbose"
//usage: "\n -c Report changes made"
//usage: "\n -h Affect symlinks instead of their targets"
//usage: "\n -f Suppress most error messages"
//usage: "\n -u USER Set user/role/type/range in the target security context"
//usage: "\n -r ROLE"
//usage: "\n -t TYPE"
//usage: "\n -l RNG"
//usage: "\n -R Recurse"
//usage: )
#include <selinux/context.h>
#include "libbb.h"
#define OPT_RECURSIVE (1<<0) /* 'R' */
#define OPT_CHANHES (1<<1) /* 'c' */
#define OPT_NODEREFERENCE (1<<2) /* 'h' */
#define OPT_QUIET (1<<3) /* 'f' */
#define OPT_USER (1<<4) /* 'u' */
#define OPT_ROLE (1<<5) /* 'r' */
#define OPT_TYPE (1<<6) /* 't' */
#define OPT_RANGE (1<<7) /* 'l' */
#define OPT_VERBOSE (1<<8) /* 'v' */
#define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
#define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
static char *user = NULL;
static char *role = NULL;
static char *type = NULL;
static char *range = NULL;
static char *specified_context = NULL;
static int FAST_FUNC change_filedir_context(
const char *fname,
struct stat *stbuf UNUSED_PARAM,
void *userData UNUSED_PARAM,
int depth UNUSED_PARAM)
{
context_t context = NULL;
security_context_t file_context = NULL;
security_context_t context_string;
int rc = FALSE;
int status = 0;
if (option_mask32 & OPT_NODEREFERENCE) {
status = lgetfilecon(fname, &file_context);
} else {
status = getfilecon(fname, &file_context);
}
if (status < 0 && errno != ENODATA) {
if ((option_mask32 & OPT_QUIET) == 0)
bb_error_msg("can't obtain security context: %s", fname);
goto skip;
}
if (file_context == NULL && specified_context == NULL) {
bb_error_msg("can't apply partial context to unlabeled file %s", fname);
goto skip;
}
if (specified_context == NULL) {
context = set_security_context_component(file_context,
user, role, type, range);
if (!context) {
bb_error_msg("can't compute security context from %s", file_context);
goto skip;
}
} else {
context = context_new(specified_context);
if (!context) {
bb_error_msg("invalid context: %s", specified_context);
goto skip;
}
}
context_string = context_str(context);
if (!context_string) {
bb_error_msg("can't obtain security context in text expression");
goto skip;
}
if (file_context == NULL || strcmp(context_string, file_context) != 0) {
int fail;
if (option_mask32 & OPT_NODEREFERENCE) {
fail = lsetfilecon(fname, context_string);
} else {
fail = setfilecon(fname, context_string);
}
if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
printf(!fail
? "context of %s changed to %s\n"
: "can't change context of %s to %s\n",
fname, context_string);
}
if (!fail) {
rc = TRUE;
} else if ((option_mask32 & OPT_QUIET) == 0) {
bb_error_msg("can't change context of %s to %s",
fname, context_string);
}
} else if (option_mask32 & OPT_VERBOSE) {
printf("context of %s retained as %s\n", fname, context_string);
rc = TRUE;
}
skip:
context_free(context);
freecon(file_context);
return rc;
}
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
static const char chcon_longopts[] ALIGN1 =
"recursive\0" No_argument "R"
"changes\0" No_argument "c"
"no-dereference\0" No_argument "h"
"silent\0" No_argument "f"
"quiet\0" No_argument "f"
"user\0" Required_argument "u"
"role\0" Required_argument "r"
"type\0" Required_argument "t"
"range\0" Required_argument "l"
"verbose\0" No_argument "v"
"reference\0" Required_argument "\xff" /* no short option */
;
#endif
int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chcon_main(int argc UNUSED_PARAM, char **argv)
{
char *reference_file;
char *fname;
int i, errors = 0;
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
applet_long_options = chcon_longopts;
#endif
opt_complementary = "-1" /* at least 1 param */
":?" /* error if exclusivity constraints are violated */
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
#endif
":f--v:v--f"; /* 'verbose' and 'quiet' are exclusive */
getopt32(argv, "Rchfu:r:t:l:v",
&user, &role, &type, &range, &reference_file);
argv += optind;
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
if (option_mask32 & OPT_REFERENCE) {
/* FIXME: lgetfilecon() should be used when '-h' is specified.
* But current implementation follows the original one. */
if (getfilecon(reference_file, &specified_context) < 0)
bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
} else
#endif
if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
specified_context = *argv++;
/* specified_context is never NULL -
* "-1" in opt_complementary prevents this. */
if (!argv[0])
bb_error_msg_and_die("too few arguments");
}
for (i = 0; (fname = argv[i]) != NULL; i++) {
int fname_len = strlen(fname);
while (fname_len > 1 && fname[fname_len - 1] == '/')
fname_len--;
fname[fname_len] = '\0';
if (recursive_action(fname,
1<<option_mask32 & OPT_RECURSIVE,
change_filedir_context,
change_filedir_context,
NULL, 0) != TRUE)
errors = 1;
}
return errors;
}
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