[3320] | 1 | /*
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| 2 | * chcon -- change security context, based on coreutils-5.97-13
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| 3 | *
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| 4 | * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
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| 5 | *
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| 6 | * Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
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| 7 | *
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| 8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 9 | */
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| 10 | #include <getopt.h>
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| 11 | #include <selinux/context.h>
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | #define OPT_RECURSIVE (1<<0) /* 'R' */
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| 16 | #define OPT_CHANHES (1<<1) /* 'c' */
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| 17 | #define OPT_NODEREFERENCE (1<<2) /* 'h' */
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| 18 | #define OPT_QUIET (1<<3) /* 'f' */
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| 19 | #define OPT_USER (1<<4) /* 'u' */
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| 20 | #define OPT_ROLE (1<<5) /* 'r' */
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| 21 | #define OPT_TYPE (1<<6) /* 't' */
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| 22 | #define OPT_RANGE (1<<7) /* 'l' */
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| 23 | #define OPT_VERBOSE (1<<8) /* 'v' */
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| 24 | #define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
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| 25 | #define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
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| 26 |
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| 27 | static char *user = NULL;
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| 28 | static char *role = NULL;
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| 29 | static char *type = NULL;
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| 30 | static char *range = NULL;
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| 31 | static char *specified_context = NULL;
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| 32 |
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| 33 | static int FAST_FUNC change_filedir_context(
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| 34 | const char *fname,
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| 35 | struct stat *stbuf UNUSED_PARAM,
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| 36 | void *userData UNUSED_PARAM,
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| 37 | int depth UNUSED_PARAM)
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| 38 | {
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| 39 | context_t context = NULL;
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| 40 | security_context_t file_context = NULL;
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| 41 | security_context_t context_string;
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| 42 | int rc = FALSE;
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| 43 | int status = 0;
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| 44 |
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| 45 | if (option_mask32 & OPT_NODEREFERENCE) {
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| 46 | status = lgetfilecon(fname, &file_context);
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| 47 | } else {
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| 48 | status = getfilecon(fname, &file_context);
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| 49 | }
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| 50 | if (status < 0 && errno != ENODATA) {
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| 51 | if ((option_mask32 & OPT_QUIET) == 0)
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| 52 | bb_error_msg("can't obtain security context: %s", fname);
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| 53 | goto skip;
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| 54 | }
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| 55 |
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| 56 | if (file_context == NULL && specified_context == NULL) {
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| 57 | bb_error_msg("can't apply partial context to unlabeled file %s", fname);
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| 58 | goto skip;
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| 59 | }
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| 60 |
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| 61 | if (specified_context == NULL) {
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| 62 | context = set_security_context_component(file_context,
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| 63 | user, role, type, range);
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| 64 | if (!context) {
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| 65 | bb_error_msg("can't compute security context from %s", file_context);
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| 66 | goto skip;
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| 67 | }
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| 68 | } else {
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| 69 | context = context_new(specified_context);
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| 70 | if (!context) {
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| 71 | bb_error_msg("invalid context: %s", specified_context);
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| 72 | goto skip;
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| 73 | }
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| 74 | }
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| 75 |
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| 76 | context_string = context_str(context);
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| 77 | if (!context_string) {
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| 78 | bb_error_msg("can't obtain security context in text expression");
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| 79 | goto skip;
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| 80 | }
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| 81 |
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| 82 | if (file_context == NULL || strcmp(context_string, file_context) != 0) {
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| 83 | int fail;
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| 84 |
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| 85 | if (option_mask32 & OPT_NODEREFERENCE) {
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| 86 | fail = lsetfilecon(fname, context_string);
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| 87 | } else {
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| 88 | fail = setfilecon(fname, context_string);
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| 89 | }
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| 90 | if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
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| 91 | printf(!fail
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| 92 | ? "context of %s changed to %s\n"
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| 93 | : "can't change context of %s to %s\n",
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| 94 | fname, context_string);
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| 95 | }
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| 96 | if (!fail) {
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| 97 | rc = TRUE;
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| 98 | } else if ((option_mask32 & OPT_QUIET) == 0) {
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| 99 | bb_error_msg("can't change context of %s to %s",
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| 100 | fname, context_string);
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| 101 | }
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| 102 | } else if (option_mask32 & OPT_VERBOSE) {
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| 103 | printf("context of %s retained as %s\n", fname, context_string);
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| 104 | rc = TRUE;
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| 105 | }
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| 106 | skip:
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| 107 | context_free(context);
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| 108 | freecon(file_context);
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| 109 |
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| 110 | return rc;
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| 111 | }
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| 112 |
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| 113 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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| 114 | static const char chcon_longopts[] ALIGN1 =
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| 115 | "recursive\0" No_argument "R"
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| 116 | "changes\0" No_argument "c"
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| 117 | "no-dereference\0" No_argument "h"
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| 118 | "silent\0" No_argument "f"
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| 119 | "quiet\0" No_argument "f"
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| 120 | "user\0" Required_argument "u"
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| 121 | "role\0" Required_argument "r"
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| 122 | "type\0" Required_argument "t"
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| 123 | "range\0" Required_argument "l"
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| 124 | "verbose\0" No_argument "v"
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| 125 | "reference\0" Required_argument "\xff" /* no short option */
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| 126 | ;
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| 127 | #endif
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| 128 |
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| 129 | int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 130 | int chcon_main(int argc UNUSED_PARAM, char **argv)
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| 131 | {
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| 132 | char *reference_file;
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| 133 | char *fname;
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| 134 | int i, errors = 0;
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| 135 |
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| 136 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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| 137 | applet_long_options = chcon_longopts;
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| 138 | #endif
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| 139 | opt_complementary = "-1" /* at least 1 param */
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| 140 | ":?" /* error if exclusivity constraints are violated */
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| 141 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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| 142 | ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
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| 143 | #endif
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| 144 | ":f--v:v--f"; /* 'verbose' and 'quiet' are exclusive */
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| 145 | getopt32(argv, "Rchfu:r:t:l:v",
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| 146 | &user, &role, &type, &range, &reference_file);
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| 147 | argv += optind;
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| 148 |
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| 149 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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| 150 | if (option_mask32 & OPT_REFERENCE) {
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| 151 | /* FIXME: lgetfilecon() should be used when '-h' is specified.
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| 152 | But current implementation follows the original one. */
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| 153 | if (getfilecon(reference_file, &specified_context) < 0)
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| 154 | bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
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| 155 | } else
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| 156 | #endif
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| 157 | if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
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| 158 | specified_context = *argv++;
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| 159 | /* specified_context is never NULL -
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| 160 | * "-1" in opt_complementary prevents this. */
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| 161 | if (!argv[0])
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| 162 | bb_error_msg_and_die("too few arguments");
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| 163 | }
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| 164 |
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| 165 | for (i = 0; (fname = argv[i]) != NULL; i++) {
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| 166 | int fname_len = strlen(fname);
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| 167 | while (fname_len > 1 && fname[fname_len - 1] == '/')
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| 168 | fname_len--;
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| 169 | fname[fname_len] = '\0';
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| 170 |
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| 171 | if (recursive_action(fname,
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| 172 | 1<<option_mask32 & OPT_RECURSIVE,
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| 173 | change_filedir_context,
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| 174 | change_filedir_context,
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| 175 | NULL, 0) != TRUE)
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| 176 | errors = 1;
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| 177 | }
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| 178 | return errors;
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| 179 | }
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