mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
b77d357ea3
* lib/dirent-private.h, m4/codeset.m4, m4/locale-fr.m4, m4/musl.m4: New files, from Gnulib.
304 lines
8.9 KiB
C
304 lines
8.9 KiB
C
/* Internal implementation of access control lists. -*- coding: utf-8 -*-
|
|
|
|
Copyright (C) 2002-2003, 2005-2023 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 3 of the License, 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, see <https://www.gnu.org/licenses/>.
|
|
|
|
Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */
|
|
|
|
/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_ATTRIBUTE_PURE. */
|
|
#if !_GL_CONFIG_H_INCLUDED
|
|
#error "Please include config.h first."
|
|
#endif
|
|
|
|
#include "acl.h"
|
|
|
|
#include <stdlib.h>
|
|
|
|
/* All systems define the ACL related API in <sys/acl.h>. */
|
|
#if HAVE_SYS_ACL_H
|
|
# include <sys/acl.h>
|
|
#endif
|
|
#if defined HAVE_FACL && ! defined GETACLCNT && defined ACL_CNT
|
|
# define GETACLCNT ACL_CNT
|
|
#endif
|
|
|
|
/* On Linux and Cygwin >= 2.5, additional ACL related API is available in
|
|
<acl/libacl.h>. */
|
|
#ifdef HAVE_ACL_LIBACL_H
|
|
# include <acl/libacl.h>
|
|
#endif
|
|
|
|
/* On HP-UX >= 11.11, additional ACL API is available in <aclv.h>. */
|
|
#if HAVE_ACLV_H
|
|
# include <sys/types.h>
|
|
# include <aclv.h>
|
|
/* HP-UX 11.11 lacks these declarations. */
|
|
extern int acl (char *, int, int, struct acl *);
|
|
extern int aclsort (int, int, struct acl *);
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
|
|
#include <limits.h>
|
|
#ifndef MIN
|
|
# define MIN(a,b) ((a) < (b) ? (a) : (b))
|
|
#endif
|
|
|
|
#ifndef SIZE_MAX
|
|
# define SIZE_MAX ((size_t) -1)
|
|
#endif
|
|
|
|
#ifndef HAVE_FCHMOD
|
|
# define HAVE_FCHMOD false
|
|
# define fchmod(fd, mode) (-1)
|
|
#endif
|
|
|
|
_GL_INLINE_HEADER_BEGIN
|
|
#ifndef ACL_INTERNAL_INLINE
|
|
# define ACL_INTERNAL_INLINE _GL_INLINE
|
|
#endif
|
|
|
|
#if USE_ACL
|
|
|
|
# if HAVE_ACL_GET_FILE
|
|
/* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
|
|
/* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */
|
|
|
|
# ifndef MIN_ACL_ENTRIES
|
|
# define MIN_ACL_ENTRIES 4
|
|
# endif
|
|
|
|
/* POSIX 1003.1e (draft 17) */
|
|
# ifdef HAVE_ACL_GET_FD
|
|
/* Most platforms have a 1-argument acl_get_fd, only OSF/1 has a 2-argument
|
|
macro(!). */
|
|
# if HAVE_ACL_FREE_TEXT /* OSF/1 */
|
|
ACL_INTERNAL_INLINE acl_t
|
|
rpl_acl_get_fd (int fd)
|
|
{
|
|
return acl_get_fd (fd, ACL_TYPE_ACCESS);
|
|
}
|
|
# undef acl_get_fd
|
|
# define acl_get_fd rpl_acl_get_fd
|
|
# endif
|
|
# else
|
|
# define HAVE_ACL_GET_FD false
|
|
# undef acl_get_fd
|
|
# define acl_get_fd(fd) (NULL)
|
|
# endif
|
|
|
|
/* POSIX 1003.1e (draft 17) */
|
|
# ifdef HAVE_ACL_SET_FD
|
|
/* Most platforms have a 2-argument acl_set_fd, only OSF/1 has a 3-argument
|
|
macro(!). */
|
|
# if HAVE_ACL_FREE_TEXT /* OSF/1 */
|
|
ACL_INTERNAL_INLINE int
|
|
rpl_acl_set_fd (int fd, acl_t acl)
|
|
{
|
|
return acl_set_fd (fd, ACL_TYPE_ACCESS, acl);
|
|
}
|
|
# undef acl_set_fd
|
|
# define acl_set_fd rpl_acl_set_fd
|
|
# endif
|
|
# else
|
|
# define HAVE_ACL_SET_FD false
|
|
# undef acl_set_fd
|
|
# define acl_set_fd(fd, acl) (-1)
|
|
# endif
|
|
|
|
/* POSIX 1003.1e (draft 13) */
|
|
# if ! HAVE_ACL_FREE_TEXT
|
|
# define acl_free_text(buf) acl_free (buf)
|
|
# endif
|
|
|
|
/* Linux-specific */
|
|
/* Cygwin >= 2.5 implements this function, but it returns 1 for all
|
|
directories, thus is unusable. */
|
|
# if !defined HAVE_ACL_EXTENDED_FILE || defined __CYGWIN__
|
|
# undef HAVE_ACL_EXTENDED_FILE
|
|
# define HAVE_ACL_EXTENDED_FILE false
|
|
# define acl_extended_file(name) (-1)
|
|
# endif
|
|
|
|
# if ! defined HAVE_ACL_FROM_MODE && ! defined HAVE_ACL_FROM_TEXT
|
|
# define acl_from_mode (NULL)
|
|
# endif
|
|
|
|
/* Set to 0 if a file's mode is stored independently from the ACL. */
|
|
# if (HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP) || defined __sgi /* Mac OS X, IRIX */
|
|
# define MODE_INSIDE_ACL 0
|
|
# endif
|
|
|
|
/* Return the number of entries in ACL.
|
|
Return -1 and set errno upon failure to determine it. */
|
|
/* Define a replacement for acl_entries if needed. (Only Linux has it.) */
|
|
# if !HAVE_ACL_ENTRIES
|
|
# define acl_entries rpl_acl_entries
|
|
extern int acl_entries (acl_t);
|
|
# endif
|
|
|
|
# if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */
|
|
/* ACL is an ACL, from a file, stored as type ACL_TYPE_EXTENDED.
|
|
Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial. */
|
|
extern int acl_extended_nontrivial (acl_t);
|
|
# else
|
|
/* ACL is an ACL, from a file, stored as type ACL_TYPE_ACCESS.
|
|
Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode.
|
|
Return -1 and set errno upon failure to determine it. */
|
|
extern int acl_access_nontrivial (acl_t);
|
|
|
|
/* ACL is an ACL, from a file, stored as type ACL_TYPE_DEFAULT.
|
|
Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode.
|
|
Return -1 and set errno upon failure to determine it. */
|
|
extern int acl_default_nontrivial (acl_t);
|
|
# endif
|
|
|
|
# elif HAVE_FACL && defined GETACL /* Solaris, Cygwin < 2.5, not HP-UX */
|
|
|
|
/* Set to 0 if a file's mode is stored independently from the ACL. */
|
|
# if defined __CYGWIN__ /* Cygwin */
|
|
# define MODE_INSIDE_ACL 0
|
|
# endif
|
|
|
|
/* Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int acl_nontrivial (int count, aclent_t *entries) _GL_ATTRIBUTE_PURE;
|
|
|
|
# ifdef ACE_GETACL /* Solaris 10 */
|
|
|
|
/* Test an ACL retrieved with ACE_GETACL.
|
|
Return 1 if the given ACL, consisting of COUNT entries, is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int acl_ace_nontrivial (int count, ace_t *entries) _GL_ATTRIBUTE_PURE;
|
|
|
|
/* Definitions for when the built executable is executed on Solaris 10
|
|
(newer version) or Solaris 11. */
|
|
/* For a_type. */
|
|
# define OLD_ALLOW 0
|
|
# define OLD_DENY 1
|
|
# define NEW_ACE_ACCESS_ALLOWED_ACE_TYPE 0 /* replaces ALLOW */
|
|
# define NEW_ACE_ACCESS_DENIED_ACE_TYPE 1 /* replaces DENY */
|
|
/* For a_flags. */
|
|
# define OLD_ACE_OWNER 0x0100
|
|
# define OLD_ACE_GROUP 0x0200
|
|
# define OLD_ACE_OTHER 0x0400
|
|
# define NEW_ACE_OWNER 0x1000
|
|
# define NEW_ACE_GROUP 0x2000
|
|
# define NEW_ACE_IDENTIFIER_GROUP 0x0040
|
|
# define NEW_ACE_EVERYONE 0x4000
|
|
/* For a_access_mask. */
|
|
# define NEW_ACE_READ_DATA 0x001 /* corresponds to 'r' */
|
|
# define NEW_ACE_WRITE_DATA 0x002 /* corresponds to 'w' */
|
|
# define NEW_ACE_APPEND_DATA 0x004
|
|
# define NEW_ACE_READ_NAMED_ATTRS 0x008
|
|
# define NEW_ACE_WRITE_NAMED_ATTRS 0x010
|
|
# define NEW_ACE_EXECUTE 0x020
|
|
# define NEW_ACE_DELETE_CHILD 0x040
|
|
# define NEW_ACE_READ_ATTRIBUTES 0x080
|
|
# define NEW_ACE_WRITE_ATTRIBUTES 0x100
|
|
# define NEW_ACE_DELETE 0x10000
|
|
# define NEW_ACE_READ_ACL 0x20000
|
|
# define NEW_ACE_WRITE_ACL 0x40000
|
|
# define NEW_ACE_WRITE_OWNER 0x80000
|
|
# define NEW_ACE_SYNCHRONIZE 0x100000
|
|
|
|
# endif
|
|
|
|
# elif HAVE_GETACL /* HP-UX */
|
|
|
|
/* Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int acl_nontrivial (int count, struct acl_entry *entries);
|
|
|
|
# if HAVE_ACLV_H /* HP-UX >= 11.11 */
|
|
|
|
/* Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int aclv_nontrivial (int count, struct acl *entries);
|
|
|
|
# endif
|
|
|
|
# elif HAVE_ACLX_GET && 0 /* AIX */
|
|
|
|
/* TODO */
|
|
|
|
# elif HAVE_STATACL /* older AIX */
|
|
|
|
/* Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int acl_nontrivial (struct acl *a);
|
|
|
|
# elif HAVE_ACLSORT /* NonStop Kernel */
|
|
|
|
/* Return 1 if the given ACL is non-trivial.
|
|
Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
|
|
extern int acl_nontrivial (int count, struct acl *entries);
|
|
|
|
# endif
|
|
|
|
/* Set to 1 if a file's mode is implicit by the ACL. */
|
|
# ifndef MODE_INSIDE_ACL
|
|
# define MODE_INSIDE_ACL 1
|
|
# endif
|
|
|
|
#endif
|
|
|
|
struct permission_context {
|
|
mode_t mode;
|
|
#if USE_ACL
|
|
# if HAVE_ACL_GET_FILE /* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */
|
|
acl_t acl;
|
|
# if !HAVE_ACL_TYPE_EXTENDED
|
|
acl_t default_acl;
|
|
# endif
|
|
bool acls_not_supported;
|
|
|
|
# elif defined GETACL /* Solaris, Cygwin < 2.5 */
|
|
int count;
|
|
aclent_t *entries;
|
|
# ifdef ACE_GETACL
|
|
int ace_count;
|
|
ace_t *ace_entries;
|
|
# endif
|
|
|
|
# elif HAVE_GETACL /* HP-UX */
|
|
struct acl_entry entries[NACLENTRIES];
|
|
int count;
|
|
# if HAVE_ACLV_H
|
|
struct acl aclv_entries[NACLVENTRIES];
|
|
int aclv_count;
|
|
# endif
|
|
|
|
# elif HAVE_STATACL /* older AIX */
|
|
union { struct acl a; char room[4096]; } u;
|
|
bool have_u;
|
|
|
|
# elif HAVE_ACLSORT /* NonStop Kernel */
|
|
struct acl entries[NACLENTRIES];
|
|
int count;
|
|
|
|
# endif
|
|
#endif
|
|
};
|
|
|
|
int get_permissions (const char *, int, mode_t, struct permission_context *);
|
|
int set_permissions (struct permission_context *, const char *, int);
|
|
void free_permission_context (struct permission_context *);
|
|
|
|
_GL_INLINE_HEADER_END
|