1 | /*
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2 | setfiles: based on policycoreutils 2.0.19
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3 | policycoreutils was released under GPL 2.
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4 | Port to BusyBox (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
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5 | */
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6 |
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7 | #include "libbb.h"
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8 | #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
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9 | #include <sepol/sepol.h>
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10 | #endif
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11 |
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12 | #define MAX_EXCLUDES 50
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13 |
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14 | struct edir {
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15 | char *directory;
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16 | size_t size;
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17 | };
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18 |
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19 | struct globals {
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20 | FILE *outfile;
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21 | char *policyfile;
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22 | char *rootpath;
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23 | int rootpathlen;
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24 | unsigned count;
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25 | int excludeCtr;
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26 | int errors;
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27 | int verbose; /* getopt32 uses it, has to be int */
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28 | smallint recurse; /* Recursive descent */
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29 | smallint follow_mounts;
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30 | /* Behavior flags determined based on setfiles vs. restorecon */
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31 | smallint expand_realpath; /* Expand paths via realpath */
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32 | smallint abort_on_error; /* Abort the file tree walk upon an error */
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33 | int add_assoc; /* Track inode associations for conflict detection */
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34 | int matchpathcon_flags; /* Flags to matchpathcon */
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35 | dev_t dev_id; /* Device id where target file exists */
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36 | int nerr;
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37 | struct edir excludeArray[MAX_EXCLUDES];
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38 | };
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39 |
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40 | #define G (*(struct globals*)&bb_common_bufsiz1)
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41 | void BUG_setfiles_globals_too_big(void);
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42 | #define INIT_G() do { \
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43 | if (sizeof(G) > COMMON_BUFSIZE) \
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44 | BUG_setfiles_globals_too_big(); \
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45 | /* memset(&G, 0, sizeof(G)); - already is */ \
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46 | } while (0)
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47 | #define outfile (G.outfile )
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48 | #define policyfile (G.policyfile )
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49 | #define rootpath (G.rootpath )
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50 | #define rootpathlen (G.rootpathlen )
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51 | #define count (G.count )
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52 | #define excludeCtr (G.excludeCtr )
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53 | #define errors (G.errors )
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54 | #define verbose (G.verbose )
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55 | #define recurse (G.recurse )
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56 | #define follow_mounts (G.follow_mounts )
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57 | #define expand_realpath (G.expand_realpath )
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58 | #define abort_on_error (G.abort_on_error )
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59 | #define add_assoc (G.add_assoc )
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60 | #define matchpathcon_flags (G.matchpathcon_flags)
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61 | #define dev_id (G.dev_id )
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62 | #define nerr (G.nerr )
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63 | #define excludeArray (G.excludeArray )
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64 |
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65 | /* Must match getopt32 string! */
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66 | enum {
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67 | OPT_d = (1 << 0),
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68 | OPT_e = (1 << 1),
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69 | OPT_f = (1 << 2),
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70 | OPT_i = (1 << 3),
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71 | OPT_l = (1 << 4),
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72 | OPT_n = (1 << 5),
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73 | OPT_p = (1 << 6),
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74 | OPT_q = (1 << 7),
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75 | OPT_r = (1 << 8),
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76 | OPT_s = (1 << 9),
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77 | OPT_v = (1 << 10),
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78 | OPT_o = (1 << 11),
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79 | OPT_F = (1 << 12),
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80 | OPT_W = (1 << 13),
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81 | OPT_c = (1 << 14), /* c only for setfiles */
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82 | OPT_R = (1 << 14), /* R only for restorecon */
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83 | };
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84 | #define FLAG_d_debug (option_mask32 & OPT_d)
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85 | #define FLAG_e (option_mask32 & OPT_e)
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86 | #define FLAG_f (option_mask32 & OPT_f)
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87 | #define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
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88 | #define FLAG_l_take_log (option_mask32 & OPT_l)
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89 | #define FLAG_n_dry_run (option_mask32 & OPT_n)
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90 | #define FLAG_p_progress (option_mask32 & OPT_p)
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91 | #define FLAG_q_quiet (option_mask32 & OPT_q)
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92 | #define FLAG_r (option_mask32 & OPT_r)
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93 | #define FLAG_s (option_mask32 & OPT_s)
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94 | #define FLAG_v (option_mask32 & OPT_v)
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95 | #define FLAG_o (option_mask32 & OPT_o)
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96 | #define FLAG_F_force (option_mask32 & OPT_F)
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97 | #define FLAG_W_warn_no_match (option_mask32 & OPT_W)
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98 | #define FLAG_c (option_mask32 & OPT_c)
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99 | #define FLAG_R (option_mask32 & OPT_R)
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100 |
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101 |
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102 | static void qprintf(const char *fmt, ...)
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103 | {
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104 | /* quiet, do nothing */
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105 | }
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106 |
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107 | static void inc_err(void)
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108 | {
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109 | nerr++;
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110 | if (nerr > 9 && !FLAG_d_debug) {
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111 | bb_error_msg_and_die("exiting after 10 errors");
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112 | }
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113 | }
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114 |
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115 | static void add_exclude(const char *const directory)
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116 | {
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117 | struct stat sb;
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118 | size_t len;
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119 |
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120 | if (directory == NULL || directory[0] != '/') {
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121 | bb_error_msg_and_die("full path required for exclude: %s", directory);
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122 |
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123 | }
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124 | if (lstat(directory, &sb)) {
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125 | bb_error_msg("directory \"%s\" not found, ignoring", directory);
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126 | return;
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127 | }
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128 | if ((sb.st_mode & S_IFDIR) == 0) {
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129 | bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
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130 | directory, sb.st_mode);
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131 | return;
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132 | }
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133 | if (excludeCtr == MAX_EXCLUDES) {
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134 | bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
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135 | }
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136 |
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137 | len = strlen(directory);
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138 | while (len > 1 && directory[len - 1] == '/') {
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139 | len--;
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140 | }
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141 | excludeArray[excludeCtr].directory = xstrndup(directory, len);
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142 | excludeArray[excludeCtr++].size = len;
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143 | }
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144 |
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145 | static bool exclude(const char *file)
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146 | {
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147 | int i = 0;
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148 | for (i = 0; i < excludeCtr; i++) {
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149 | if (strncmp(file, excludeArray[i].directory,
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150 | excludeArray[i].size) == 0) {
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151 | if (file[excludeArray[i].size] == '\0'
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152 | || file[excludeArray[i].size] == '/') {
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153 | return 1;
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154 | }
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155 | }
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156 | }
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157 | return 0;
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158 | }
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159 |
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160 | static int match(const char *name, struct stat *sb, char **con)
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161 | {
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162 | int ret;
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163 | char path[PATH_MAX + 1];
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164 | char *tmp_path = xstrdup(name);
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165 |
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166 | if (excludeCtr > 0 && exclude(name)) {
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167 | goto err;
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168 | }
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169 | ret = lstat(name, sb);
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170 | if (ret) {
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171 | if (FLAG_i_ignore_enoent && errno == ENOENT) {
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172 | free(tmp_path);
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173 | return 0;
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174 | }
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175 | bb_error_msg("stat(%s)", name);
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176 | goto err;
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177 | }
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178 |
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179 | if (expand_realpath) {
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180 | if (S_ISLNK(sb->st_mode)) {
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181 | char *p = NULL;
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182 | char *file_sep;
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183 |
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184 | size_t len = 0;
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185 |
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186 | if (verbose > 1)
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187 | bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
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188 |
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189 | file_sep = strrchr(tmp_path, '/');
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190 | if (file_sep == tmp_path) {
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191 | file_sep++;
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192 | path[0] = '\0';
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193 | p = path;
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194 | } else if (file_sep) {
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195 | *file_sep++ = '\0';
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196 | p = realpath(tmp_path, path);
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197 | } else {
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198 | file_sep = tmp_path;
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199 | p = realpath("./", path);
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200 | }
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201 | if (p)
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202 | len = strlen(p);
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203 | if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
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204 | bb_perror_msg("realpath(%s) failed", name);
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205 | goto err;
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206 | }
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207 | p += len;
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208 | /* ensure trailing slash of directory name */
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209 | if (len == 0 || p[-1] != '/') {
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210 | *p++ = '/';
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211 | }
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212 | strcpy(p, file_sep);
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213 | name = path;
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214 | if (excludeCtr > 0 && exclude(name))
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215 | goto err;
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216 |
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217 | } else {
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218 | char *p;
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219 | p = realpath(name, path);
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220 | if (!p) {
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221 | bb_perror_msg("realpath(%s)", name);
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222 | goto err;
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223 | }
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224 | name = p;
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225 | if (excludeCtr > 0 && exclude(name))
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226 | goto err;
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227 | }
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228 | }
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229 |
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230 | /* name will be what is matched in the policy */
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231 | if (NULL != rootpath) {
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232 | if (0 != strncmp(rootpath, name, rootpathlen)) {
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233 | bb_error_msg("%s is not located in %s",
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234 | name, rootpath);
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235 | goto err;
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236 | }
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237 | name += rootpathlen;
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238 | }
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239 |
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240 | free(tmp_path);
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241 | if (rootpath != NULL && name[0] == '\0')
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242 | /* this is actually the root dir of the alt root */
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243 | return matchpathcon_index("/", sb->st_mode, con);
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244 | return matchpathcon_index(name, sb->st_mode, con);
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245 | err:
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246 | free(tmp_path);
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247 | return -1;
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248 | }
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249 |
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250 | /* Compare two contexts to see if their differences are "significant",
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251 | * or whether the only difference is in the user. */
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252 | static bool only_changed_user(const char *a, const char *b)
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253 | {
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254 | if (FLAG_F_force)
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255 | return 0;
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256 | if (!a || !b)
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257 | return 0;
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258 | a = strchr(a, ':'); /* Rest of the context after the user */
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259 | b = strchr(b, ':');
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260 | if (!a || !b)
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261 | return 0;
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262 | return (strcmp(a, b) == 0);
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263 | }
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264 |
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265 | static int restore(const char *file)
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266 | {
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267 | char *my_file;
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268 | struct stat my_sb;
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269 | int i, j, ret;
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270 | char *context = NULL;
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271 | char *newcon = NULL;
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272 | bool user_only_changed = 0;
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273 | int retval = 0;
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274 |
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275 | my_file = bb_simplify_path(file);
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276 |
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277 | i = match(my_file, &my_sb, &newcon);
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278 |
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279 | if (i < 0) /* No matching specification. */
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280 | goto out;
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281 |
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282 | if (FLAG_p_progress) {
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283 | count++;
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284 | if (count % 0x400 == 0) { /* every 1024 times */
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285 | count = (count % (80*0x400));
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286 | if (count == 0)
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287 | fputc('\n', stdout);
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288 | fputc('*', stdout);
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289 | fflush(stdout);
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290 | }
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291 | }
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292 |
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293 | /*
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294 | * Try to add an association between this inode and
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295 | * this specification. If there is already an association
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296 | * for this inode and it conflicts with this specification,
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297 | * then use the last matching specification.
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298 | */
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299 | if (add_assoc) {
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300 | j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
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301 | if (j < 0)
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302 | goto err;
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303 |
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304 | if (j != i) {
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305 | /* There was already an association and it took precedence. */
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306 | goto out;
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307 | }
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308 | }
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309 |
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310 | if (FLAG_d_debug)
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311 | printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
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312 |
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313 | /* Get the current context of the file. */
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314 | ret = lgetfilecon_raw(my_file, &context);
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315 | if (ret < 0) {
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316 | if (errno == ENODATA) {
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317 | context = NULL; /* paranoia */
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318 | } else {
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319 | bb_perror_msg("lgetfilecon_raw on %s", my_file);
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320 | goto err;
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321 | }
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322 | user_only_changed = 0;
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323 | } else
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324 | user_only_changed = only_changed_user(context, newcon);
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325 |
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326 | /*
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327 | * Do not relabel the file if the matching specification is
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328 | * <<none>> or the file is already labeled according to the
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329 | * specification.
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330 | */
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331 | if ((strcmp(newcon, "<<none>>") == 0)
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332 | || (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
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333 | goto out;
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334 | }
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335 |
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336 | if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
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337 | if (verbose > 1) {
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338 | bb_error_msg("skipping %s. %s is customizable_types",
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339 | my_file, context);
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340 | }
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341 | goto out;
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342 | }
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343 |
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344 | if (verbose) {
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345 | /* If we're just doing "-v", trim out any relabels where
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346 | * the user has changed but the role and type are the
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347 | * same. For "-vv", emit everything. */
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348 | if (verbose > 1 || !user_only_changed) {
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349 | bb_info_msg("%s: reset %s context %s->%s",
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350 | applet_name, my_file, context ?: "", newcon);
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351 | }
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352 | }
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353 |
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354 | if (FLAG_l_take_log && !user_only_changed) {
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355 | if (context)
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356 | bb_info_msg("relabeling %s from %s to %s", my_file, context, newcon);
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357 | else
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358 | bb_info_msg("labeling %s to %s", my_file, newcon);
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359 | }
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360 |
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361 | if (outfile && !user_only_changed)
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362 | fprintf(outfile, "%s\n", my_file);
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363 |
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364 | /*
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365 | * Do not relabel the file if -n was used.
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366 | */
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367 | if (FLAG_n_dry_run || user_only_changed)
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368 | goto out;
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369 |
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370 | /*
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371 | * Relabel the file to the specified context.
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372 | */
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373 | ret = lsetfilecon(my_file, newcon);
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374 | if (ret) {
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375 | bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
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376 | goto err;
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377 | }
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378 |
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379 | out:
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380 | freecon(context);
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381 | freecon(newcon);
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382 | free(my_file);
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383 | return retval;
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384 | err:
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385 | retval--; /* -1 */
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386 | goto out;
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387 | }
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388 |
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389 | /*
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390 | * Apply the last matching specification to a file.
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391 | * This function is called by recursive_action on each file during
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392 | * the directory traversal.
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393 | */
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394 | static int apply_spec(const char *file,
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395 | struct stat *sb, void *userData, int depth)
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396 | {
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397 | if (!follow_mounts) {
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398 | /* setfiles does not process across different mount points */
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399 | if (sb->st_dev != dev_id) {
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400 | return SKIP;
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401 | }
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402 | }
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403 | errors |= restore(file);
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404 | if (abort_on_error && errors)
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405 | return FALSE;
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406 | return TRUE;
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407 | }
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408 |
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409 |
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410 | static int canoncon(const char *path, unsigned lineno, char **contextp)
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411 | {
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412 | static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
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413 |
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414 | char *tmpcon;
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415 | char *context = *contextp;
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416 | int invalid = 0;
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417 |
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418 | #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
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419 | if (policyfile) {
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420 | if (sepol_check_context(context) >= 0)
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421 | return 0;
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422 | /* Exit immediately if we're in checking mode. */
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423 | bb_error_msg_and_die(err_msg, path, lineno, context);
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424 | }
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425 | #endif
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426 |
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427 | if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
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428 | if (errno != ENOENT) {
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429 | invalid = 1;
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430 | inc_err();
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431 | }
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432 | } else {
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433 | free(context);
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434 | *contextp = tmpcon;
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435 | }
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436 |
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437 | if (invalid) {
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438 | bb_error_msg(err_msg, path, lineno, context);
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439 | }
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440 |
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441 | return invalid;
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442 | }
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443 |
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444 | static int process_one(char *name)
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445 | {
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446 | struct stat sb;
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447 | int rc;
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448 |
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449 | rc = lstat(name, &sb);
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450 | if (rc < 0) {
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451 | if (FLAG_i_ignore_enoent && errno == ENOENT)
|
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452 | return 0;
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453 | bb_perror_msg("stat(%s)", name);
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454 | goto err;
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455 | }
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456 | dev_id = sb.st_dev;
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457 |
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458 | if (S_ISDIR(sb.st_mode) && recurse) {
|
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459 | if (recursive_action(name,
|
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460 | ACTION_RECURSE,
|
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461 | apply_spec,
|
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462 | apply_spec,
|
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463 | NULL, 0) != TRUE) {
|
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464 | bb_error_msg("error while labeling %s", name);
|
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465 | goto err;
|
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466 | }
|
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467 | } else {
|
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468 | rc = restore(name);
|
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469 | if (rc)
|
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470 | goto err;
|
---|
471 | }
|
---|
472 |
|
---|
473 | out:
|
---|
474 | if (add_assoc) {
|
---|
475 | if (FLAG_q_quiet)
|
---|
476 | set_matchpathcon_printf(&qprintf);
|
---|
477 | matchpathcon_filespec_eval();
|
---|
478 | set_matchpathcon_printf(NULL);
|
---|
479 | matchpathcon_filespec_destroy();
|
---|
480 | }
|
---|
481 |
|
---|
482 | return rc;
|
---|
483 |
|
---|
484 | err:
|
---|
485 | rc = -1;
|
---|
486 | goto out;
|
---|
487 | }
|
---|
488 |
|
---|
489 | int setfiles_main(int argc, char **argv);
|
---|
490 | int setfiles_main(int argc, char **argv)
|
---|
491 | {
|
---|
492 | struct stat sb;
|
---|
493 | int rc, i = 0;
|
---|
494 | const char *input_filename = NULL;
|
---|
495 | char *buf = NULL;
|
---|
496 | size_t buf_len;
|
---|
497 | int flags;
|
---|
498 | llist_t *exclude_dir = NULL;
|
---|
499 | char *out_filename = NULL;
|
---|
500 |
|
---|
501 | INIT_G();
|
---|
502 |
|
---|
503 | if (applet_name[0] == 's') { /* "setfiles" */
|
---|
504 | /*
|
---|
505 | * setfiles:
|
---|
506 | * Recursive descent,
|
---|
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.
|
---|
512 | */
|
---|
513 | recurse = 1;
|
---|
514 | abort_on_error = 1;
|
---|
515 | add_assoc = 1;
|
---|
516 | /* follow_mounts = 0; - already is */
|
---|
517 | matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
|
---|
518 | } else {
|
---|
519 | /*
|
---|
520 | * restorecon:
|
---|
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,
|
---|
525 | * Follows mounts,
|
---|
526 | * Does lazy validation of contexts upon use.
|
---|
527 | */
|
---|
528 | expand_realpath = 1;
|
---|
529 | follow_mounts = 1;
|
---|
530 | matchpathcon_flags = MATCHPATHCON_NOTRANS;
|
---|
531 | /* restorecon only */
|
---|
532 | selinux_or_die();
|
---|
533 | }
|
---|
534 |
|
---|
535 | set_matchpathcon_flags(matchpathcon_flags);
|
---|
536 |
|
---|
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,)
|
---|
547 | &verbose);
|
---|
548 | }
|
---|
549 |
|
---|
550 | #if ENABLE_FEATURE_SETFILES_CHECK_OPTION
|
---|
551 | if ((applet_name[0] == 's') && (flags & OPT_c)) {
|
---|
552 | FILE *policystream;
|
---|
553 |
|
---|
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);
|
---|
557 | }
|
---|
558 | fclose(policystream);
|
---|
559 |
|
---|
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);
|
---|
566 | }
|
---|
567 | #endif
|
---|
568 |
|
---|
569 | while (exclude_dir)
|
---|
570 | add_exclude(llist_pop(&exclude_dir));
|
---|
571 |
|
---|
572 | if (flags & OPT_o) {
|
---|
573 | outfile = stdout;
|
---|
574 | if (NOT_LONE_CHAR(out_filename, '-')) {
|
---|
575 | outfile = xfopen(out_filename, "w");
|
---|
576 | }
|
---|
577 | }
|
---|
578 | if (applet_name[0] == 'r') { /* restorecon */
|
---|
579 | if (flags & (OPT_r | OPT_R))
|
---|
580 | recurse = 1;
|
---|
581 | } else { /* setfiles */
|
---|
582 | if (flags & OPT_r)
|
---|
583 | rootpathlen = strlen(rootpath);
|
---|
584 | }
|
---|
585 | if (flags & OPT_s) {
|
---|
586 | input_filename = "-";
|
---|
587 | add_assoc = 0;
|
---|
588 | }
|
---|
589 |
|
---|
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);
|
---|
595 | if (argc == 1)
|
---|
596 | bb_show_usage();
|
---|
597 | if (stat(argv[optind], &sb) < 0) {
|
---|
598 | bb_perror_msg_and_die("%s", argv[optind]);
|
---|
599 | }
|
---|
600 | if (!S_ISREG(sb.st_mode)) {
|
---|
601 | bb_error_msg_and_die("spec file %s is not a regular file", argv[optind]);
|
---|
602 | }
|
---|
603 | /* Load the file contexts configuration and check it. */
|
---|
604 | rc = matchpathcon_init(argv[optind]);
|
---|
605 | if (rc < 0) {
|
---|
606 | bb_perror_msg_and_die("%s", argv[optind]);
|
---|
607 | }
|
---|
608 |
|
---|
609 | optind++;
|
---|
610 |
|
---|
611 | if (nerr)
|
---|
612 | exit(1);
|
---|
613 | }
|
---|
614 |
|
---|
615 | if (input_filename) {
|
---|
616 | ssize_t len;
|
---|
617 | FILE *f = stdin;
|
---|
618 |
|
---|
619 | if (NOT_LONE_CHAR(input_filename, '-'))
|
---|
620 | f = xfopen(input_filename, "r");
|
---|
621 | while ((len = getline(&buf, &buf_len, f)) > 0) {
|
---|
622 | buf[len - 1] = '\0';
|
---|
623 | errors |= process_one(buf);
|
---|
624 | }
|
---|
625 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
626 | fclose_if_not_stdin(f);
|
---|
627 | } else {
|
---|
628 | if (optind >= argc)
|
---|
629 | bb_show_usage();
|
---|
630 | for (i = optind; i < argc; i++) {
|
---|
631 | errors |= process_one(argv[i]);
|
---|
632 | }
|
---|
633 | }
|
---|
634 |
|
---|
635 | if (FLAG_W_warn_no_match)
|
---|
636 | matchpathcon_checkmatches(argv[0]);
|
---|
637 |
|
---|
638 | if (ENABLE_FEATURE_CLEAN_UP && outfile)
|
---|
639 | fclose(outfile);
|
---|
640 |
|
---|
641 | return errors;
|
---|
642 | }
|
---|