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/* Internal implementation of access control lists. -*- coding: utf-8 -*-
Copyright (C) 2002-2003, 2005-2020 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. */
#include "acl.h"
#include <stdbool.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
#ifndef _GL_INLINE_HEADER_BEGIN
#error "Please include config.h first."
#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
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