1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /*- |
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4 | * SPDX-License-Identifier: BSD-2-Clause-FreeBSD |
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5 | * |
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6 | * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson |
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7 | * Copyright (c) 2002, 2003 Networks Associates Technology, Inc. |
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8 | * All rights reserved. |
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9 | * |
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10 | * This software was developed by Robert Watson for the TrustedBSD Project. |
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11 | * |
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12 | * This software was developed for the FreeBSD Project in part by Network |
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13 | * Associates Laboratories, the Security Research Division of Network |
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14 | * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), |
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15 | * as part of the DARPA CHATS research program. |
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16 | * |
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17 | * Redistribution and use in source and binary forms, with or without |
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18 | * modification, are permitted provided that the following conditions |
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19 | * are met: |
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20 | * 1. Redistributions of source code must retain the above copyright |
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21 | * notice, this list of conditions and the following disclaimer. |
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22 | * 2. Redistributions in binary form must reproduce the above copyright |
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23 | * notice, this list of conditions and the following disclaimer in the |
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24 | * documentation and/or other materials provided with the distribution. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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36 | * SUCH DAMAGE. |
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37 | */ |
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38 | |
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39 | #include <sys/cdefs.h> |
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40 | __FBSDID("$FreeBSD$"); |
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41 | |
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42 | #include <sys/types.h> |
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43 | #include <sys/queue.h> |
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44 | #include <sys/sysctl.h> |
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45 | |
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46 | #include <dlfcn.h> |
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47 | #include <errno.h> |
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48 | #include <limits.h> |
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49 | #include <stdio.h> |
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50 | #include <stdlib.h> |
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51 | #include <string.h> |
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52 | #include <unistd.h> |
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53 | |
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54 | #include <sys/mac.h> |
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55 | |
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56 | static int internal_initialized; |
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57 | |
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58 | /* |
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59 | * Maintain a list of default label preparations for various object |
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60 | * types. Each name will appear only once in the list. |
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61 | * |
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62 | * XXXMAC: Not thread-safe. |
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63 | */ |
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64 | static LIST_HEAD(, label_default) label_default_head; |
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65 | struct label_default { |
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66 | char *ld_name; |
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67 | char *ld_labels; |
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68 | LIST_ENTRY(label_default) ld_entries; |
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69 | }; |
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70 | |
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71 | static void |
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72 | mac_destroy_labels(void) |
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73 | { |
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74 | struct label_default *ld; |
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75 | |
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76 | while ((ld = LIST_FIRST(&label_default_head))) { |
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77 | free(ld->ld_name); |
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78 | free(ld->ld_labels); |
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79 | LIST_REMOVE(ld, ld_entries); |
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80 | free(ld); |
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81 | } |
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82 | } |
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83 | |
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84 | static void |
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85 | mac_destroy_internal(void) |
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86 | { |
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87 | |
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88 | mac_destroy_labels(); |
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89 | |
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90 | internal_initialized = 0; |
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91 | } |
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92 | |
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93 | static int |
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94 | mac_add_type(const char *name, const char *labels) |
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95 | { |
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96 | struct label_default *ld, *ld_new; |
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97 | char *name_dup, *labels_dup; |
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98 | |
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99 | /* |
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100 | * Speculatively allocate all the memory now to avoid allocating |
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101 | * later when we will someday hold a mutex. |
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102 | */ |
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103 | name_dup = strdup(name); |
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104 | if (name_dup == NULL) { |
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105 | errno = ENOMEM; |
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106 | return (-1); |
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107 | } |
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108 | labels_dup = strdup(labels); |
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109 | if (labels_dup == NULL) { |
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110 | free(name_dup); |
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111 | errno = ENOMEM; |
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112 | return (-1); |
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113 | } |
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114 | ld_new = malloc(sizeof(*ld)); |
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115 | if (ld_new == NULL) { |
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116 | free(name_dup); |
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117 | free(labels_dup); |
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118 | errno = ENOMEM; |
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119 | return (-1); |
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120 | } |
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121 | |
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122 | /* |
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123 | * If the type is already present, replace the current entry |
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124 | * rather than add a new instance. |
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125 | */ |
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126 | for (ld = LIST_FIRST(&label_default_head); ld != NULL; |
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127 | ld = LIST_NEXT(ld, ld_entries)) { |
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128 | if (strcmp(name, ld->ld_name) == 0) |
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129 | break; |
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130 | } |
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131 | |
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132 | if (ld != NULL) { |
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133 | free(ld->ld_labels); |
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134 | ld->ld_labels = labels_dup; |
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135 | labels_dup = NULL; |
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136 | } else { |
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137 | ld = ld_new; |
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138 | ld->ld_name = name_dup; |
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139 | ld->ld_labels = labels_dup; |
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140 | |
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141 | ld_new = NULL; |
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142 | name_dup = NULL; |
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143 | labels_dup = NULL; |
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144 | |
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145 | LIST_INSERT_HEAD(&label_default_head, ld, ld_entries); |
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146 | } |
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147 | |
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148 | if (name_dup != NULL) |
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149 | free(name_dup); |
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150 | if (labels_dup != NULL) |
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151 | free(labels_dup); |
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152 | if (ld_new != NULL) |
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153 | free(ld_new); |
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154 | |
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155 | return (0); |
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156 | } |
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157 | |
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158 | static char * |
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159 | next_token(char **string) |
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160 | { |
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161 | char *token; |
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162 | |
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163 | token = strsep(string, " \t"); |
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164 | while (token != NULL && *token == '\0') |
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165 | token = strsep(string, " \t"); |
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166 | |
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167 | return (token); |
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168 | } |
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169 | |
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170 | static int |
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171 | mac_init_internal(int ignore_errors) |
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172 | { |
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173 | const char *filename; |
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174 | char line[LINE_MAX]; |
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175 | FILE *file; |
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176 | int error; |
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177 | |
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178 | error = 0; |
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179 | |
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180 | LIST_INIT(&label_default_head); |
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181 | |
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182 | if (!issetugid() && getenv("MAC_CONFFILE") != NULL) |
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183 | filename = getenv("MAC_CONFFILE"); |
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184 | else |
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185 | filename = MAC_CONFFILE; |
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186 | file = fopen(filename, "re"); |
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187 | if (file == NULL) |
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188 | return (0); |
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189 | |
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190 | while (fgets(line, LINE_MAX, file)) { |
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191 | char *comment, *parse, *statement; |
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192 | |
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193 | if (line[strlen(line)-1] == '\n') |
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194 | line[strlen(line)-1] = '\0'; |
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195 | else { |
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196 | if (ignore_errors) |
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197 | continue; |
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198 | fclose(file); |
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199 | error = EINVAL; |
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200 | goto just_return; |
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201 | } |
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202 | |
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203 | /* Remove any comment. */ |
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204 | comment = line; |
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205 | parse = strsep(&comment, "#"); |
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206 | |
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207 | /* Blank lines OK. */ |
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208 | statement = next_token(&parse); |
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209 | if (statement == NULL) |
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210 | continue; |
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211 | |
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212 | if (strcmp(statement, "default_labels") == 0) { |
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213 | char *name, *labels; |
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214 | |
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215 | name = next_token(&parse); |
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216 | labels = next_token(&parse); |
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217 | if (name == NULL || labels == NULL || |
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218 | next_token(&parse) != NULL) { |
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219 | if (ignore_errors) |
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220 | continue; |
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221 | error = EINVAL; |
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222 | fclose(file); |
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223 | goto just_return; |
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224 | } |
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225 | |
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226 | if (mac_add_type(name, labels) == -1) { |
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227 | if (ignore_errors) |
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228 | continue; |
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229 | fclose(file); |
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230 | goto just_return; |
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231 | } |
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232 | } else if (strcmp(statement, "default_ifnet_labels") == 0 || |
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233 | strcmp(statement, "default_file_labels") == 0 || |
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234 | strcmp(statement, "default_process_labels") == 0) { |
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235 | char *labels, *type; |
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236 | |
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237 | if (strcmp(statement, "default_ifnet_labels") == 0) |
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238 | type = "ifnet"; |
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239 | else if (strcmp(statement, "default_file_labels") == 0) |
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240 | type = "file"; |
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241 | else if (strcmp(statement, "default_process_labels") == |
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242 | 0) |
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243 | type = "process"; |
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244 | |
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245 | labels = next_token(&parse); |
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246 | if (labels == NULL || next_token(&parse) != NULL) { |
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247 | if (ignore_errors) |
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248 | continue; |
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249 | error = EINVAL; |
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250 | fclose(file); |
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251 | goto just_return; |
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252 | } |
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253 | |
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254 | if (mac_add_type(type, labels) == -1) { |
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255 | if (ignore_errors) |
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256 | continue; |
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257 | fclose(file); |
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258 | goto just_return; |
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259 | } |
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260 | } else { |
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261 | if (ignore_errors) |
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262 | continue; |
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263 | fclose(file); |
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264 | error = EINVAL; |
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265 | goto just_return; |
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266 | } |
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267 | } |
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268 | |
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269 | fclose(file); |
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270 | |
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271 | internal_initialized = 1; |
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272 | |
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273 | just_return: |
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274 | if (error != 0) |
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275 | mac_destroy_internal(); |
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276 | return (error); |
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277 | } |
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278 | |
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279 | static int |
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280 | mac_maybe_init_internal(void) |
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281 | { |
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282 | |
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283 | if (!internal_initialized) |
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284 | return (mac_init_internal(1)); |
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285 | else |
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286 | return (0); |
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287 | } |
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288 | |
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289 | int |
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290 | mac_reload(void) |
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291 | { |
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292 | |
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293 | if (internal_initialized) |
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294 | mac_destroy_internal(); |
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295 | return (mac_init_internal(0)); |
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296 | } |
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297 | |
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298 | int |
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299 | mac_free(struct mac *mac) |
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300 | { |
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301 | |
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302 | if (mac->m_string != NULL) |
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303 | free(mac->m_string); |
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304 | free(mac); |
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305 | |
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306 | return (0); |
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307 | } |
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308 | |
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309 | int |
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310 | mac_from_text(struct mac **mac, const char *text) |
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311 | { |
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312 | |
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313 | *mac = (struct mac *) malloc(sizeof(**mac)); |
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314 | if (*mac == NULL) |
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315 | return (ENOMEM); |
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316 | |
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317 | (*mac)->m_string = strdup(text); |
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318 | if ((*mac)->m_string == NULL) { |
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319 | free(*mac); |
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320 | *mac = NULL; |
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321 | return (ENOMEM); |
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322 | } |
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323 | |
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324 | (*mac)->m_buflen = strlen((*mac)->m_string)+1; |
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325 | |
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326 | return (0); |
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327 | } |
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328 | |
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329 | int |
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330 | mac_to_text(struct mac *mac, char **text) |
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331 | { |
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332 | |
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333 | *text = strdup(mac->m_string); |
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334 | if (*text == NULL) |
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335 | return (ENOMEM); |
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336 | return (0); |
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337 | } |
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338 | |
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339 | int |
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340 | mac_prepare(struct mac **mac, const char *elements) |
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341 | { |
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342 | |
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343 | if (strlen(elements) >= MAC_MAX_LABEL_BUF_LEN) |
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344 | return (EINVAL); |
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345 | |
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346 | *mac = (struct mac *) malloc(sizeof(**mac)); |
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347 | if (*mac == NULL) |
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348 | return (ENOMEM); |
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349 | |
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350 | (*mac)->m_string = malloc(MAC_MAX_LABEL_BUF_LEN); |
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351 | if ((*mac)->m_string == NULL) { |
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352 | free(*mac); |
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353 | *mac = NULL; |
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354 | return (ENOMEM); |
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355 | } |
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356 | |
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357 | strcpy((*mac)->m_string, elements); |
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358 | (*mac)->m_buflen = MAC_MAX_LABEL_BUF_LEN; |
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359 | |
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360 | return (0); |
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361 | } |
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362 | |
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363 | int |
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364 | mac_prepare_type(struct mac **mac, const char *name) |
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365 | { |
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366 | struct label_default *ld; |
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367 | int error; |
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368 | |
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369 | error = mac_maybe_init_internal(); |
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370 | if (error != 0) |
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371 | return (error); |
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372 | |
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373 | for (ld = LIST_FIRST(&label_default_head); ld != NULL; |
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374 | ld = LIST_NEXT(ld, ld_entries)) { |
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375 | if (strcmp(name, ld->ld_name) == 0) |
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376 | return (mac_prepare(mac, ld->ld_labels)); |
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377 | } |
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378 | |
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379 | errno = ENOENT; |
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380 | return (-1); /* XXXMAC: ENOLABEL */ |
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381 | } |
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382 | |
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383 | int |
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384 | mac_prepare_ifnet_label(struct mac **mac) |
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385 | { |
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386 | |
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387 | return (mac_prepare_type(mac, "ifnet")); |
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388 | } |
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389 | |
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390 | int |
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391 | mac_prepare_file_label(struct mac **mac) |
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392 | { |
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393 | |
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394 | return (mac_prepare_type(mac, "file")); |
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395 | } |
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396 | |
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397 | int |
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398 | mac_prepare_packet_label(struct mac **mac) |
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399 | { |
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400 | |
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401 | return (mac_prepare_type(mac, "packet")); |
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402 | } |
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403 | |
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404 | int |
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405 | mac_prepare_process_label(struct mac **mac) |
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406 | { |
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407 | |
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408 | return (mac_prepare_type(mac, "process")); |
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409 | } |
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410 | |
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411 | /* |
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412 | * Simply test whether the TrustedBSD/MAC MIB tree is present; if so, |
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413 | * return 1 to indicate that the system has MAC enabled overall or for |
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414 | * a given policy. |
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415 | */ |
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416 | int |
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417 | mac_is_present(const char *policyname) |
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418 | { |
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419 | int mib[5]; |
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420 | size_t siz; |
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421 | char *mibname; |
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422 | int error; |
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423 | |
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424 | if (policyname != NULL) { |
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425 | if (policyname[strcspn(policyname, ".=")] != '\0') { |
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426 | errno = EINVAL; |
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427 | return (-1); |
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428 | } |
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429 | mibname = malloc(sizeof("security.mac.") - 1 + |
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430 | strlen(policyname) + sizeof(".enabled")); |
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431 | if (mibname == NULL) |
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432 | return (-1); |
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433 | strcpy(mibname, "security.mac."); |
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434 | strcat(mibname, policyname); |
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435 | strcat(mibname, ".enabled"); |
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436 | siz = 5; |
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437 | error = sysctlnametomib(mibname, mib, &siz); |
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438 | free(mibname); |
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439 | } else { |
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440 | siz = 3; |
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441 | error = sysctlnametomib("security.mac", mib, &siz); |
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442 | } |
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443 | if (error == -1) { |
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444 | switch (errno) { |
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445 | case ENOTDIR: |
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446 | case ENOENT: |
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447 | return (0); |
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448 | default: |
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449 | return (error); |
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450 | } |
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451 | } |
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452 | return (1); |
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453 | } |
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