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 |
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11 | //usage:#define chcon_trivial_usage
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12 | //usage: "[OPTIONS] CONTEXT FILE..."
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13 | //usage: "\n chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
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14 | //usage: IF_FEATURE_CHCON_LONG_OPTIONS(
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15 | //usage: "\n chcon [OPTIONS] --reference=RFILE FILE..."
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16 | //usage: )
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17 | //usage:#define chcon_full_usage "\n\n"
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18 | //usage: "Change the security context of each FILE to CONTEXT\n"
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19 | //usage: IF_FEATURE_CHCON_LONG_OPTIONS(
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20 | //usage: "\n -v,--verbose Verbose"
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21 | //usage: "\n -c,--changes Report changes made"
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22 | //usage: "\n -h,--no-dereference Affect symlinks instead of their targets"
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23 | //usage: "\n -f,--silent,--quiet Suppress most error messages"
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24 | //usage: "\n --reference=RFILE Use RFILE's group instead of using a CONTEXT value"
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25 | //usage: "\n -u,--user=USER Set user/role/type/range in the target"
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26 | //usage: "\n -r,--role=ROLE security context"
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27 | //usage: "\n -t,--type=TYPE"
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28 | //usage: "\n -l,--range=RANGE"
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29 | //usage: "\n -R,--recursive Recurse"
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30 | //usage: )
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31 | //usage: IF_NOT_FEATURE_CHCON_LONG_OPTIONS(
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32 | //usage: "\n -v Verbose"
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33 | //usage: "\n -c Report changes made"
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34 | //usage: "\n -h Affect symlinks instead of their targets"
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35 | //usage: "\n -f Suppress most error messages"
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36 | //usage: "\n -u USER Set user/role/type/range in the target security context"
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37 | //usage: "\n -r ROLE"
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38 | //usage: "\n -t TYPE"
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39 | //usage: "\n -l RNG"
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40 | //usage: "\n -R Recurse"
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41 | //usage: )
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42 |
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43 | #include <selinux/context.h>
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44 |
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45 | #include "libbb.h"
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46 |
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47 | #define OPT_RECURSIVE (1<<0) /* 'R' */
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48 | #define OPT_CHANHES (1<<1) /* 'c' */
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49 | #define OPT_NODEREFERENCE (1<<2) /* 'h' */
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50 | #define OPT_QUIET (1<<3) /* 'f' */
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51 | #define OPT_USER (1<<4) /* 'u' */
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52 | #define OPT_ROLE (1<<5) /* 'r' */
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53 | #define OPT_TYPE (1<<6) /* 't' */
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54 | #define OPT_RANGE (1<<7) /* 'l' */
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55 | #define OPT_VERBOSE (1<<8) /* 'v' */
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56 | #define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
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57 | #define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
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58 |
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59 | static char *user = NULL;
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60 | static char *role = NULL;
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61 | static char *type = NULL;
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62 | static char *range = NULL;
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63 | static char *specified_context = NULL;
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64 |
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65 | static int FAST_FUNC change_filedir_context(
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66 | const char *fname,
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67 | struct stat *stbuf UNUSED_PARAM,
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68 | void *userData UNUSED_PARAM,
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69 | int depth UNUSED_PARAM)
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70 | {
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71 | context_t context = NULL;
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72 | security_context_t file_context = NULL;
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73 | security_context_t context_string;
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74 | int rc = FALSE;
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75 | int status = 0;
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76 |
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77 | if (option_mask32 & OPT_NODEREFERENCE) {
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78 | status = lgetfilecon(fname, &file_context);
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79 | } else {
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80 | status = getfilecon(fname, &file_context);
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81 | }
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82 | if (status < 0 && errno != ENODATA) {
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83 | if ((option_mask32 & OPT_QUIET) == 0)
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84 | bb_error_msg("can't obtain security context: %s", fname);
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85 | goto skip;
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86 | }
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87 |
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88 | if (file_context == NULL && specified_context == NULL) {
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89 | bb_error_msg("can't apply partial context to unlabeled file %s", fname);
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90 | goto skip;
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91 | }
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92 |
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93 | if (specified_context == NULL) {
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94 | context = set_security_context_component(file_context,
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95 | user, role, type, range);
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96 | if (!context) {
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97 | bb_error_msg("can't compute security context from %s", file_context);
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98 | goto skip;
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99 | }
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100 | } else {
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101 | context = context_new(specified_context);
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102 | if (!context) {
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103 | bb_error_msg("invalid context: %s", specified_context);
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104 | goto skip;
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105 | }
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106 | }
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107 |
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108 | context_string = context_str(context);
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109 | if (!context_string) {
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110 | bb_error_msg("can't obtain security context in text expression");
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111 | goto skip;
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112 | }
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113 |
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114 | if (file_context == NULL || strcmp(context_string, file_context) != 0) {
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115 | int fail;
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116 |
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117 | if (option_mask32 & OPT_NODEREFERENCE) {
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118 | fail = lsetfilecon(fname, context_string);
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119 | } else {
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120 | fail = setfilecon(fname, context_string);
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121 | }
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122 | if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
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123 | printf(!fail
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124 | ? "context of %s changed to %s\n"
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125 | : "can't change context of %s to %s\n",
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126 | fname, context_string);
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127 | }
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128 | if (!fail) {
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129 | rc = TRUE;
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130 | } else if ((option_mask32 & OPT_QUIET) == 0) {
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131 | bb_error_msg("can't change context of %s to %s",
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132 | fname, context_string);
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133 | }
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134 | } else if (option_mask32 & OPT_VERBOSE) {
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135 | printf("context of %s retained as %s\n", fname, context_string);
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136 | rc = TRUE;
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137 | }
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138 | skip:
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139 | context_free(context);
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140 | freecon(file_context);
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141 |
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142 | return rc;
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143 | }
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144 |
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145 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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146 | static const char chcon_longopts[] ALIGN1 =
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147 | "recursive\0" No_argument "R"
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148 | "changes\0" No_argument "c"
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149 | "no-dereference\0" No_argument "h"
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150 | "silent\0" No_argument "f"
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151 | "quiet\0" No_argument "f"
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152 | "user\0" Required_argument "u"
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153 | "role\0" Required_argument "r"
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154 | "type\0" Required_argument "t"
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155 | "range\0" Required_argument "l"
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156 | "verbose\0" No_argument "v"
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157 | "reference\0" Required_argument "\xff" /* no short option */
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158 | ;
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159 | #endif
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160 |
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161 | int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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162 | int chcon_main(int argc UNUSED_PARAM, char **argv)
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163 | {
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164 | char *reference_file;
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165 | char *fname;
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166 | int i, errors = 0;
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167 |
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168 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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169 | applet_long_options = chcon_longopts;
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170 | #endif
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171 | opt_complementary = "-1" /* at least 1 param */
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172 | ":?" /* error if exclusivity constraints are violated */
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173 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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174 | ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
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175 | #endif
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176 | ":f--v:v--f"; /* 'verbose' and 'quiet' are exclusive */
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177 | getopt32(argv, "Rchfu:r:t:l:v",
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178 | &user, &role, &type, &range, &reference_file);
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179 | argv += optind;
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180 |
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181 | #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
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182 | if (option_mask32 & OPT_REFERENCE) {
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183 | /* FIXME: lgetfilecon() should be used when '-h' is specified.
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184 | * But current implementation follows the original one. */
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185 | if (getfilecon(reference_file, &specified_context) < 0)
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186 | bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
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187 | } else
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188 | #endif
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189 | if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
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190 | specified_context = *argv++;
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191 | /* specified_context is never NULL -
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192 | * "-1" in opt_complementary prevents this. */
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193 | if (!argv[0])
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194 | bb_error_msg_and_die("too few arguments");
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195 | }
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196 |
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197 | for (i = 0; (fname = argv[i]) != NULL; i++) {
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198 | int fname_len = strlen(fname);
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199 | while (fname_len > 1 && fname[fname_len - 1] == '/')
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200 | fname_len--;
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201 | fname[fname_len] = '\0';
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202 |
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203 | if (recursive_action(fname,
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204 | 1<<option_mask32 & OPT_RECURSIVE,
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205 | change_filedir_context,
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206 | change_filedir_context,
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207 | NULL, 0) != TRUE)
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208 | errors = 1;
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209 | }
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210 | return errors;
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211 | }
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