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303 lines
8.9 KiB
C
303 lines
8.9 KiB
C
/* Internal implementation of access control lists. -*- coding: utf-8 -*-
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Copyright (C) 2002-2003, 2005-2021 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */
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#include "acl.h"
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#include <stdbool.h>
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#include <stdlib.h>
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/* All systems define the ACL related API in <sys/acl.h>. */
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#if HAVE_SYS_ACL_H
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# include <sys/acl.h>
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#endif
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#if defined HAVE_FACL && ! defined GETACLCNT && defined ACL_CNT
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# define GETACLCNT ACL_CNT
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#endif
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/* On Linux and Cygwin >= 2.5, additional ACL related API is available in
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<acl/libacl.h>. */
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#ifdef HAVE_ACL_LIBACL_H
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# include <acl/libacl.h>
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#endif
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/* On HP-UX >= 11.11, additional ACL API is available in <aclv.h>. */
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#if HAVE_ACLV_H
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# include <sys/types.h>
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# include <aclv.h>
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/* HP-UX 11.11 lacks these declarations. */
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extern int acl (char *, int, int, struct acl *);
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extern int aclsort (int, int, struct acl *);
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#endif
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#include <errno.h>
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#include <limits.h>
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#ifndef MIN
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# define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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#ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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#endif
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#ifndef HAVE_FCHMOD
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# define HAVE_FCHMOD false
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# define fchmod(fd, mode) (-1)
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#endif
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#ifndef _GL_INLINE_HEADER_BEGIN
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#error "Please include config.h first."
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#endif
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_GL_INLINE_HEADER_BEGIN
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#ifndef ACL_INTERNAL_INLINE
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# define ACL_INTERNAL_INLINE _GL_INLINE
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#endif
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#if USE_ACL
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# if HAVE_ACL_GET_FILE
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/* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
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/* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */
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# ifndef MIN_ACL_ENTRIES
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# define MIN_ACL_ENTRIES 4
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# endif
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/* POSIX 1003.1e (draft 17) */
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# ifdef HAVE_ACL_GET_FD
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/* Most platforms have a 1-argument acl_get_fd, only OSF/1 has a 2-argument
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macro(!). */
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# if HAVE_ACL_FREE_TEXT /* OSF/1 */
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ACL_INTERNAL_INLINE acl_t
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rpl_acl_get_fd (int fd)
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{
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return acl_get_fd (fd, ACL_TYPE_ACCESS);
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}
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# undef acl_get_fd
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# define acl_get_fd rpl_acl_get_fd
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# endif
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# else
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# define HAVE_ACL_GET_FD false
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# undef acl_get_fd
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# define acl_get_fd(fd) (NULL)
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# endif
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/* POSIX 1003.1e (draft 17) */
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# ifdef HAVE_ACL_SET_FD
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/* Most platforms have a 2-argument acl_set_fd, only OSF/1 has a 3-argument
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macro(!). */
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# if HAVE_ACL_FREE_TEXT /* OSF/1 */
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ACL_INTERNAL_INLINE int
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rpl_acl_set_fd (int fd, acl_t acl)
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{
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return acl_set_fd (fd, ACL_TYPE_ACCESS, acl);
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}
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# undef acl_set_fd
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# define acl_set_fd rpl_acl_set_fd
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# endif
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# else
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# define HAVE_ACL_SET_FD false
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# undef acl_set_fd
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# define acl_set_fd(fd, acl) (-1)
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# endif
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/* POSIX 1003.1e (draft 13) */
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# if ! HAVE_ACL_FREE_TEXT
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# define acl_free_text(buf) acl_free (buf)
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# endif
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/* Linux-specific */
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/* Cygwin >= 2.5 implements this function, but it returns 1 for all
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directories, thus is unusable. */
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# if !defined HAVE_ACL_EXTENDED_FILE || defined __CYGWIN__
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# undef HAVE_ACL_EXTENDED_FILE
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# define HAVE_ACL_EXTENDED_FILE false
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# define acl_extended_file(name) (-1)
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# endif
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# if ! defined HAVE_ACL_FROM_MODE && ! defined HAVE_ACL_FROM_TEXT
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# define acl_from_mode (NULL)
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# endif
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/* Set to 0 if a file's mode is stored independently from the ACL. */
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# if (HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP) || defined __sgi /* Mac OS X, IRIX */
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# define MODE_INSIDE_ACL 0
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# endif
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/* Return the number of entries in ACL.
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Return -1 and set errno upon failure to determine it. */
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/* Define a replacement for acl_entries if needed. (Only Linux has it.) */
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# if !HAVE_ACL_ENTRIES
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# define acl_entries rpl_acl_entries
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extern int acl_entries (acl_t);
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# endif
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# if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */
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/* ACL is an ACL, from a file, stored as type ACL_TYPE_EXTENDED.
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Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial. */
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extern int acl_extended_nontrivial (acl_t);
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# else
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/* ACL is an ACL, from a file, stored as type ACL_TYPE_ACCESS.
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Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode.
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Return -1 and set errno upon failure to determine it. */
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extern int acl_access_nontrivial (acl_t);
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/* ACL is an ACL, from a file, stored as type ACL_TYPE_DEFAULT.
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Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode.
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Return -1 and set errno upon failure to determine it. */
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extern int acl_default_nontrivial (acl_t);
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# endif
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# elif HAVE_FACL && defined GETACL /* Solaris, Cygwin < 2.5, not HP-UX */
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/* Set to 0 if a file's mode is stored independently from the ACL. */
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# if defined __CYGWIN__ /* Cygwin */
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# define MODE_INSIDE_ACL 0
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# endif
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/* Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int acl_nontrivial (int count, aclent_t *entries) _GL_ATTRIBUTE_PURE;
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# ifdef ACE_GETACL /* Solaris 10 */
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/* Test an ACL retrieved with ACE_GETACL.
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Return 1 if the given ACL, consisting of COUNT entries, is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int acl_ace_nontrivial (int count, ace_t *entries) _GL_ATTRIBUTE_PURE;
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/* Definitions for when the built executable is executed on Solaris 10
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(newer version) or Solaris 11. */
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/* For a_type. */
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# define OLD_ALLOW 0
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# define OLD_DENY 1
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# define NEW_ACE_ACCESS_ALLOWED_ACE_TYPE 0 /* replaces ALLOW */
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# define NEW_ACE_ACCESS_DENIED_ACE_TYPE 1 /* replaces DENY */
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/* For a_flags. */
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# define OLD_ACE_OWNER 0x0100
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# define OLD_ACE_GROUP 0x0200
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# define OLD_ACE_OTHER 0x0400
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# define NEW_ACE_OWNER 0x1000
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# define NEW_ACE_GROUP 0x2000
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# define NEW_ACE_IDENTIFIER_GROUP 0x0040
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# define NEW_ACE_EVERYONE 0x4000
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/* For a_access_mask. */
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# define NEW_ACE_READ_DATA 0x001 /* corresponds to 'r' */
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# define NEW_ACE_WRITE_DATA 0x002 /* corresponds to 'w' */
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# define NEW_ACE_APPEND_DATA 0x004
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# define NEW_ACE_READ_NAMED_ATTRS 0x008
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# define NEW_ACE_WRITE_NAMED_ATTRS 0x010
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# define NEW_ACE_EXECUTE 0x020
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# define NEW_ACE_DELETE_CHILD 0x040
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# define NEW_ACE_READ_ATTRIBUTES 0x080
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# define NEW_ACE_WRITE_ATTRIBUTES 0x100
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# define NEW_ACE_DELETE 0x10000
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# define NEW_ACE_READ_ACL 0x20000
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# define NEW_ACE_WRITE_ACL 0x40000
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# define NEW_ACE_WRITE_OWNER 0x80000
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# define NEW_ACE_SYNCHRONIZE 0x100000
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# endif
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# elif HAVE_GETACL /* HP-UX */
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/* Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int acl_nontrivial (int count, struct acl_entry *entries);
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# if HAVE_ACLV_H /* HP-UX >= 11.11 */
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/* Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int aclv_nontrivial (int count, struct acl *entries);
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# endif
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# elif HAVE_ACLX_GET && 0 /* AIX */
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/* TODO */
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# elif HAVE_STATACL /* older AIX */
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/* Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int acl_nontrivial (struct acl *a);
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# elif HAVE_ACLSORT /* NonStop Kernel */
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/* Return 1 if the given ACL is non-trivial.
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Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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extern int acl_nontrivial (int count, struct acl *entries);
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# endif
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/* Set to 1 if a file's mode is implicit by the ACL. */
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# ifndef MODE_INSIDE_ACL
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# define MODE_INSIDE_ACL 1
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# endif
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#endif
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struct permission_context {
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mode_t mode;
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#if USE_ACL
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# if HAVE_ACL_GET_FILE /* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */
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acl_t acl;
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# if !HAVE_ACL_TYPE_EXTENDED
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acl_t default_acl;
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# endif
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bool acls_not_supported;
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# elif defined GETACL /* Solaris, Cygwin < 2.5 */
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int count;
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aclent_t *entries;
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# ifdef ACE_GETACL
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int ace_count;
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ace_t *ace_entries;
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# endif
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# elif HAVE_GETACL /* HP-UX */
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struct acl_entry entries[NACLENTRIES];
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int count;
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# if HAVE_ACLV_H
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struct acl aclv_entries[NACLVENTRIES];
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int aclv_count;
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# endif
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# elif HAVE_STATACL /* older AIX */
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union { struct acl a; char room[4096]; } u;
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bool have_u;
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# elif HAVE_ACLSORT /* NonStop Kernel */
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struct acl entries[NACLENTRIES];
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int count;
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# endif
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#endif
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};
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int get_permissions (const char *, int, mode_t, struct permission_context *);
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int set_permissions (struct permission_context *, const char *, int);
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void free_permission_context (struct permission_context *);
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_GL_INLINE_HEADER_END
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