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annotate lib/euidaccess.c @ 9659:5680cf5b5595

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md2: clarify comments to say that alignment is not required. * lib/md2.h: Remove warning about alignment in comment. * lib/md2.c (md2_read_ctx, md2_finish_ctx): Doc fix, alignment has never been required.
author Simon Josefsson <simon@josefsson.org>
date Thu, 31 Jan 2008 11:10:36 +0100
parents bbbbbf4cd1c5
children ad36db29dad7
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rev   line source
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1 /* euidaccess -- check if effective user id can access file
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2
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3 Copyright (C) 1990, 1991, 1995, 1998, 2000, 2003, 2004, 2005, 2006
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4 Free Software Foundation, Inc.
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5
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6 This file is part of the GNU C Library.
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7
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8 This program is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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20
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21 /* Written by David MacKenzie and Torbjorn Granlund.
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22 Adapted for GNU C library by Roland McGrath. */
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23
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24 #ifndef _LIBC
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25 # include <config.h>
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26 # include "euidaccess.h"
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27 #endif
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28
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29 #include <sys/types.h>
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30 #include <sys/stat.h>
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31 #include <unistd.h>
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32
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33 #if HAVE_LIBGEN_H
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34 # include <libgen.h>
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35 #endif
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36
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37 #include <errno.h>
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38 #ifndef __set_errno
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39 # define __set_errno(val) errno = (val)
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40 #endif
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41
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42 #if defined EACCES && !defined EACCESS
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43 # define EACCESS EACCES
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44 #endif
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45
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46 #ifndef F_OK
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47 # define F_OK 0
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48 # define X_OK 1
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49 # define W_OK 2
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50 # define R_OK 4
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51 #endif
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52
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53
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54 #ifdef _LIBC
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55
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56 # define access __access
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57 # define getuid __getuid
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58 # define getgid __getgid
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59 # define geteuid __geteuid
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60 # define getegid __getegid
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61 # define group_member __group_member
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62 # define euidaccess __euidaccess
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63 # undef stat
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64 # define stat stat64
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65
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66 #else
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67
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68 # include "group-member.h"
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69
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70 #endif
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71
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72 /* Return 0 if the user has permission of type MODE on FILE;
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73 otherwise, return -1 and set `errno'.
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74 Like access, except that it uses the effective user and group
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75 id's instead of the real ones, and it does not always check for read-only
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76 file system, text busy, etc. */
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77
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78 int
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79 euidaccess (const char *file, int mode)
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80 {
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81 #if defined EFF_ONLY_OK
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82 return access (file, mode | EFF_ONLY_OK);
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83 #elif defined ACC_SELF
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84 return accessx (file, mode, ACC_SELF);
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85 #elif HAVE_EACCESS
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86 return eaccess (file, mode);
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87 #else
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88
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89 uid_t uid = getuid ();
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90 gid_t gid = getgid ();
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91 uid_t euid = geteuid ();
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92 gid_t egid = getegid ();
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93 struct stat stats;
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94
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95 # if HAVE_DECL_SETREGID && PREFER_NONREENTRANT_EUIDACCESS
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96
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97 /* Define PREFER_NONREENTRANT_EUIDACCESS if you prefer euidaccess to
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98 return the correct result even if this would make it
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99 nonreentrant. Define this only if your entire application is
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100 safe even if the uid or gid might temporarily change. If your
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101 application uses signal handlers or threads it is probably not
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102 safe. */
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103
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104 if (mode == F_OK)
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105 return stat (file, &stats);
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106 else
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107 {
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108 int result;
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109 int saved_errno;
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110
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111 if (uid != euid)
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112 setreuid (euid, uid);
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113 if (gid != egid)
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114 setregid (egid, gid);
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115
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116 result = access (file, mode);
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117 saved_errno = errno;
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118
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119 /* Restore them. */
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120 if (uid != euid)
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121 setreuid (uid, euid);
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122 if (gid != egid)
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123 setregid (gid, egid);
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124
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125 errno = saved_errno;
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126 return result;
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127 }
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128
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129 # else
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130
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131 /* The following code assumes the traditional Unix model, and is not
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132 correct on systems that have ACLs or the like. However, it's
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133 better than nothing, and it is reentrant. */
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134
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135 unsigned int granted;
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136 if (uid == euid && gid == egid)
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137 /* If we are not set-uid or set-gid, access does the same. */
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138 return access (file, mode);
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139
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140 if (stat (file, &stats) != 0)
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141 return -1;
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142
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143 /* The super-user can read and write any file, and execute any file
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144 that anyone can execute. */
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145 if (euid == 0 && ((mode & X_OK) == 0
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146 || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
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147 return 0;
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148
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149 /* Convert the mode to traditional form, clearing any bogus bits. */
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150 if (R_OK == 4 && W_OK == 2 && X_OK == 1 && F_OK == 0)
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151 mode &= 7;
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152 else
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153 mode = ((mode & R_OK ? 4 : 0)
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154 + (mode & W_OK ? 2 : 0)
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155 + (mode & X_OK ? 1 : 0));
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156
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157 if (mode == 0)
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158 return 0; /* The file exists. */
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159
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160 /* Convert the file's permission bits to traditional form. */
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161 if (S_IRUSR == (4 << 6) && S_IWUSR == (2 << 6) && S_IXUSR == (1 << 6)
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162 && S_IRGRP == (4 << 3) && S_IWGRP == (2 << 3) && S_IXGRP == (1 << 3)
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163 && S_IROTH == (4 << 0) && S_IWOTH == (2 << 0) && S_IXOTH == (1 << 0))
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164 granted = stats.st_mode;
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165 else
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166 granted = ((stats.st_mode & S_IRUSR ? 4 << 6 : 0)
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167 + (stats.st_mode & S_IWUSR ? 2 << 6 : 0)
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168 + (stats.st_mode & S_IXUSR ? 1 << 6 : 0)
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169 + (stats.st_mode & S_IRGRP ? 4 << 3 : 0)
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170 + (stats.st_mode & S_IWGRP ? 2 << 3 : 0)
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171 + (stats.st_mode & S_IXGRP ? 1 << 3 : 0)
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172 + (stats.st_mode & S_IROTH ? 4 << 0 : 0)
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173 + (stats.st_mode & S_IWOTH ? 2 << 0 : 0)
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174 + (stats.st_mode & S_IXOTH ? 1 << 0 : 0));
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175
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176 if (euid == stats.st_uid)
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177 granted >>= 6;
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178 else if (egid == stats.st_gid || group_member (stats.st_gid))
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179 granted >>= 3;
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180
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181 if ((mode & ~granted) == 0)
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182 return 0;
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183 __set_errno (EACCESS);
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184 return -1;
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185
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186 # endif
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187 #endif
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188 }
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189 #undef euidaccess
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190 #ifdef weak_alias
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191 weak_alias (__euidaccess, euidaccess)
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192 #endif
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193
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194 #ifdef TEST
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195 # include <error.h>
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196 # include <stdio.h>
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197 # include <stdlib.h>
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198
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199 char *program_name;
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200
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201 int
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202 main (int argc, char **argv)
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203 {
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204 char *file;
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205 int mode;
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206 int err;
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207
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208 program_name = argv[0];
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209 if (argc < 3)
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210 abort ();
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211 file = argv[1];
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212 mode = atoi (argv[2]);
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213
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214 err = euidaccess (file, mode);
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215 printf ("%d\n", err);
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216 if (err != 0)
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217 error (0, errno, "%s", file);
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218 exit (0);
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219 }
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220 #endif