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annotate common/util.h @ 1278:19c1ce008ba4

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author Bernhard Reiter <bernhard@intevation.de>
date Mon, 29 Sep 2014 11:22:08 +0200
parents 0a803c3fb5a6
children 8362e30f7b55
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #ifndef COMMON_UTIL_H
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9 #define COMMON_UTIL_H
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10 /* @file util.h
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11 * @brief The usual useful stuff that fit nowhere else
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12 */
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13 #include <stdbool.h>
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14
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15 #ifdef WIN32
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16 #include <windows.h>
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17 #include <psapi.h>
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18 #endif
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19
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20 #ifdef __cplusplus
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21 extern "C" {
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22 #endif
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23
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24 #ifndef WIN32
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25 /**@def Some value to use as equivalent as MAX_PATH on windows */
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26 #define MAX_PATH_LINUX 4000
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27 #endif
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28
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29 /**@brief Check if the current process is running with elevated privileges.
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30 *
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31 * Elevates the current process token to check if it is marked as elevated.
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32 * Uses TokenElevation on windows and checks effective UID on Linux.
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33 *
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34 * @returns true if the current process is elevated.*/
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35 bool is_elevated();
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36
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37 /**@brief Check if the Software is installed system wide
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38 *
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39 * On Windows this checks if a registry key under HKLM exists for
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40 * trustbridge and that the installation path mentioned there matches
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41 * the current module path.
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42 *
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43 * On linux this looks for the installation configuration in /etc
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44 * and checks if the current process is inside the installation prefix.
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45 *
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46 * The checked path is limited to MAX_PATH on Windows and \@MAX_PATH_LINUX on
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47 * Linux.
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48 */
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49 bool is_system_install();
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50
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51 /**@brief Check if the user is in the administrators group.
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52 *
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53 * The function checks if the account that startet this process
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54 * belongs to a user that is a member of the Administrators group.
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55 *
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56 * @returns True if the user is in the admin group. False otherwise or on error.
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57 */
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58 bool is_admin();
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59
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60 /**@brief Get the directory in which the current process resides in
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61 *
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62 * Look up the directory in which the current process is placed.
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63 * If the path is longer then MAX_PATH NULL is returned.
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64 *
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65 * Returns a utf-8 encoded string that has to be freed by the caller
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66 * on linux the path is returned as is including the last /.
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67 *
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68 * @returns The directory of the current process
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69 */
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70 char * get_install_dir();
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71
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72 #ifdef WIN32
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73 /**@brief Get a copy of the processes owner sid
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74 *
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75 * Copy the SID of the owner of the process hProcess.
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76 *
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77 * The returned sid structure has to be freed with free by the caller
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78 *
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79 * @param[in] hProcess A handle to the process whose user should be obtained.
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80 * The process must have the PROCESS_QUERY_INFORMATION access permission.
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81 *
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82 * @returns A copy of the process owners sid or NULL on error.
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83 */
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84 PSID get_process_owner(HANDLE hProcess);
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85
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86 /**@brief Read (and expand if necessary) a registry string.
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87 *
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88 * Reads a registry string and calls ExpandEnvironmentString
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89 * if necessary on it. Returns a newly allocated string array
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90 * with the expanded registry value converted to UTF-8
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91 *
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92 * Caller has to free return value with free.
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93 *
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94 * @param [in] root the root key (e.g. HKEY_LOCAL_MACHINE)
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95 * @param [in] key the key
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96 * @param [in] name the name of the value to read.
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97 *
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98 * @returns the expanded, null terminated utf-8 string of the value.
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99 * or NULL on error.
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100 */
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101 char * read_registry_string (const HKEY root, const wchar_t *key,
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102 const wchar_t *name);
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103
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104 /**@brief Get the utf-8 encoded path to the program files folder.
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105 *
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106 * Uses SHGetKnownFolderPath to look up the ProgramFiles folder.
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107 * @returns a newly allocated string containing the value or NULL on
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108 * error.
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109 */
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110 char * get_program_files_folder ();
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111
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112 /**@brief Get the path to the program data folder.
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113 *
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114 * Uses SHGetKnownFolderPath to look up the ProgramData folder.
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115 * The return value should be freed with CoTaskMemFree
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116 * @returns a reference containing the value or NULL on error.
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117 */
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118 wchar_t * get_program_data_folder ();
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119
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120 /**@brief Create a directory with restricted access rights
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121 *
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122 * This creates a security attributes structure that restricts
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123 * write access to the Administrators group but allows everyone to read files
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124 * in that directory.
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125 * Basically a very complicated version of mkdir path -m 644
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126 *
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127 * If the directory exists and propagate_acl is set the permissions
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128 * of that directory are overwritten with the DACL that would have
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129 * been used to create the directory.
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130 *
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131 * Code based on msdn example:
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132 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa446595%28v=vs.85%29.aspx
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133 *
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134 * @param[in] path Path of the directory to create
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135 * @param[in] propagate_acl weather or not objects should inherit
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136 * the ACL of this directory.
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137 * @param[out] rACL optional pointer to an PACL pointer that should be
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138 * the returned value. If rACL is not NULL the caller needs to free the
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139 * returned pointer with LocalFree.
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140 *
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141 * @returns true on success of if the directory exists, false on error
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142 */
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143 bool create_restricted_directory (LPWSTR path, bool propagate_acl, PACL *rACL);
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144
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145 /**@brief Check the integrity level of the token
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146 *
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147 * Returns true if the token has at least SECURITY_MANADTORY_HIGH_RID or
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148 * higher.
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149 *
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150 * @param[in] hToken the Token to check
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151 *
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152 * @returns true if the token has at least high integrity. False on error
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153 * or otherwise.
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154 */
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155 bool has_high_integrity(HANDLE hToken);
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156
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157 /** @brief get a restricted access token to execute nss process
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158 *
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159 * This function uses the Software Restriction API to obtain the
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160 * access token for a process run als normal user.
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161 *
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162 * @returns A restricted handle or NULL on error.
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163 */
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164 HANDLE get_restricted_token();
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165
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166 /** @brief get a normal user access token
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167 *
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168 * The trusted acces token is not elevated but has the normal user rights.
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169 *
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170 * @returns A normal user handle or NULL on error.
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171 */
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172 HANDLE get_normal_token();
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173
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174 #endif
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175
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176 #ifdef __cplusplus
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177 }
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178 #endif
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179
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180 #endif // COMMON_UTIL_H
http://wald.intevation.org/projects/trustbridge/