diff options
Diffstat (limited to 'lib/euidaccess-stat.c')
| -rw-r--r-- | lib/euidaccess-stat.c | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/lib/euidaccess-stat.c b/lib/euidaccess-stat.c deleted file mode 100644 index 7663c46..0000000 --- a/lib/euidaccess-stat.c +++ /dev/null @@ -1,143 +0,0 @@ -/* euidaccess-stat -- check if effective user id can access lstat'd file - This function is probably useful only for choosing whether to issue - a prompt in an implementation of POSIX-specified rm. - - Copyright (C) 2005, 2006 Free Software Foundation, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -/* Adapted for use in GNU remove.c by Jim Meyering. */ - -#include <config.h> - -#include "euidaccess-stat.h" - -#include <unistd.h> - -#ifndef F_OK -# define F_OK 0 -# define X_OK 1 -# define W_OK 2 -# define R_OK 4 -#endif - -#include "group-member.h" -#include "stat-macros.h" - -/* Return true if the current user has permission of type MODE - on the file from which stat buffer *ST was obtained, ignoring - ACLs, attributes, `read-only'ness, etc... - Otherwise, return false. - - Like the reentrant version of euidaccess, but starting with - a stat buffer rather than a file name. Hence, this function - never calls access or accessx, and doesn't take into account - whether the file has ACLs or other attributes, or resides on - a read-only file system. */ - -bool -euidaccess_stat (struct stat const *st, int mode) -{ - uid_t euid; - unsigned int granted; - - /* Convert the mode to traditional form, clearing any bogus bits. */ - if (R_OK == 4 && W_OK == 2 && X_OK == 1 && F_OK == 0) - mode &= 7; - else - mode = ((mode & R_OK ? 4 : 0) - + (mode & W_OK ? 2 : 0) - + (mode & X_OK ? 1 : 0)); - - if (mode == 0) - return true; /* The file exists. */ - - euid = geteuid (); - - /* The super-user can read and write any file, and execute any file - that anyone can execute. */ - if (euid == 0 && ((mode & X_OK) == 0 - || (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))) - return true; - - /* Convert the file's permission bits to traditional form. */ - if ( S_IRUSR == (4 << 6) - && S_IWUSR == (2 << 6) - && S_IXUSR == (1 << 6) - && S_IRGRP == (4 << 3) - && S_IWGRP == (2 << 3) - && S_IXGRP == (1 << 3) - && S_IROTH == (4 << 0) - && S_IWOTH == (2 << 0) - && S_IXOTH == (1 << 0)) - granted = st->st_mode; - else - granted = ( (st->st_mode & S_IRUSR ? 4 << 6 : 0) - + (st->st_mode & S_IWUSR ? 2 << 6 : 0) - + (st->st_mode & S_IXUSR ? 1 << 6 : 0) - + (st->st_mode & S_IRGRP ? 4 << 3 : 0) - + (st->st_mode & S_IWGRP ? 2 << 3 : 0) - + (st->st_mode & S_IXGRP ? 1 << 3 : 0) - + (st->st_mode & S_IROTH ? 4 << 0 : 0) - + (st->st_mode & S_IWOTH ? 2 << 0 : 0) - + (st->st_mode & S_IXOTH ? 1 << 0 : 0)); - - if (euid == st->st_uid) - granted >>= 6; - else - { - gid_t egid = getegid (); - if (egid == st->st_gid || group_member (st->st_gid)) - granted >>= 3; - } - - if ((mode & ~granted) == 0) - return true; - - return false; -} - - -#ifdef TEST -# include <errno.h> -# include <stdio.h> -# include <stdlib.h> - -# include "error.h" -# define _(msg) msg - -char *program_name; - -int -main (int argc, char **argv) -{ - char *file; - int mode; - bool ok; - struct stat st; - - program_name = argv[0]; - if (argc < 3) - abort (); - file = argv[1]; - mode = atoi (argv[2]); - if (lstat (file, &st) != 0) - error (EXIT_FAILURE, errno, _("cannot stat %s"), file); - - ok = euidaccess_stat (&st, mode); - printf ("%s: %s\n", file, ok ? "y" : "n"); - exit (0); -} -#endif |