diff options
Diffstat (limited to 'REORG.TODO/sysdeps/posix/euidaccess.c')
| -rw-r--r-- | REORG.TODO/sysdeps/posix/euidaccess.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/posix/euidaccess.c b/REORG.TODO/sysdeps/posix/euidaccess.c new file mode 100644 index 0000000000..0c6f4d0c54 --- /dev/null +++ b/REORG.TODO/sysdeps/posix/euidaccess.c @@ -0,0 +1,215 @@ +/* Check if effective user id can access file + Copyright (C) 1990-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* Written by David MacKenzie and Torbjorn Granlund. + Adapted for GNU C library by Roland McGrath. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <sys/types.h> +#include <sys/stat.h> + +#ifdef S_IEXEC +# ifndef S_IXUSR +# define S_IXUSR S_IEXEC +# endif +# ifndef S_IXGRP +# define S_IXGRP (S_IEXEC >> 3) +# endif +# ifndef S_IXOTH +# define S_IXOTH (S_IEXEC >> 6) +# endif +#endif /* S_IEXEC */ + +#if defined HAVE_UNISTD_H || defined _LIBC +# include <unistd.h> +#endif + +#ifndef _POSIX_VERSION +uid_t getuid (); +gid_t getgid (); +uid_t geteuid (); +gid_t getegid (); +#endif /* not POSIX_VERSION */ + +#include <errno.h> +#ifndef errno +extern int errno; +#endif +#ifndef __set_errno +# define __set_errno(val) errno = (val) +#endif + +#if defined EACCES && !defined EACCESS +# define EACCESS EACCES +#endif + +#ifndef F_OK +# define F_OK 0 +# define X_OK 1 +# define W_OK 2 +# define R_OK 4 +#endif + +#if !defined S_IROTH && defined R_OK +# define S_IROTH R_OK +#endif +#if !defined S_IWOTH && defined W_OK +# define S_IWOTH W_OK +#endif +#if !defined S_IXOTH && defined X_OK +# define S_IXOTH X_OK +#endif + + +#ifdef _LIBC + +# define group_member __group_member +# define euidaccess __euidaccess + +#else + +/* The user's real user id. */ +static uid_t uid; + +/* The user's real group id. */ +static gid_t gid; + +/* The user's effective user id. */ +static uid_t euid; + +/* The user's effective group id. */ +static gid_t egid; + +/* Nonzero if UID, GID, EUID, and EGID have valid values. */ +static int have_ids; + +# ifdef HAVE_GETGROUPS +int group_member (); +# else +# define group_member(gid) 0 +# endif + +#endif + + +/* Return 0 if the user has permission of type MODE on file PATH; + otherwise, return -1 and set `errno' to EACCESS. + Like access, except that it uses the effective user and group + id's instead of the real ones, and it does not check for read-only + filesystem, text busy, etc. */ + +int +euidaccess (const char *path, int mode) +{ + struct stat64 stats; + int granted; + +#ifdef _LIBC + uid_t euid; + gid_t egid; +#else + if (have_ids == 0) + { + have_ids = 1; + uid = getuid (); + gid = getgid (); + euid = geteuid (); + egid = getegid (); + } + + if (uid == euid && gid == egid) + /* If we are not set-uid or set-gid, access does the same. */ + return access (path, mode); +#endif + + if (stat64 (path, &stats)) + return -1; + + mode &= (X_OK | W_OK | R_OK); /* Clear any bogus bits. */ +#if R_OK != S_IROTH || W_OK != S_IWOTH || X_OK != S_IXOTH + ?error Oops, portability assumptions incorrect. +#endif + + if (mode == F_OK) + return 0; /* The file exists. */ + +#ifdef _LIBC + /* Now we need the IDs. */ + euid = __geteuid (); + egid = __getegid (); + + if (__getuid () == euid && __getgid () == egid) + /* If we are not set-uid or set-gid, access does the same. */ + return __access (path, mode); +#endif + + /* The super-user can read and write any file, and execute any file + that anyone can execute. */ + if (euid == 0 && ((mode & X_OK) == 0 + || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))) + return 0; + + if (euid == stats.st_uid) + granted = (unsigned int) (stats.st_mode & (mode << 6)) >> 6; + else if (egid == stats.st_gid || group_member (stats.st_gid)) + granted = (unsigned int) (stats.st_mode & (mode << 3)) >> 3; + else + granted = (stats.st_mode & mode); + /* XXX Add support for ACLs. */ + if (granted == mode) + return 0; + __set_errno (EACCESS); + return -1; +} +#undef euidaccess +#undef eaccess +#ifdef weak_alias +weak_alias (__euidaccess, euidaccess) +weak_alias (__euidaccess, eaccess) +#endif + +#ifdef TEST +# include <stdio.h> +# include <errno.h> +# include "error.h" + +char *program_name; + +int +main (int argc, char **argv) +{ + char *file; + int mode; + int err; + + program_name = argv[0]; + if (argc < 3) + abort (); + file = argv[1]; + mode = atoi (argv[2]); + + err = euidaccess (file, mode); + printf ("%d\n", err); + if (err != 0) + error (0, errno, "%s", file); + exit (0); +} +#endif |