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emacs/lib/set-permissions.c
Paul Eggert 3add626f14 Update from Gnulib by running admin/merge-gnulib
2024-01-20 11:45:38 -08:00

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/* Set permissions of a file. -*- coding: utf-8 -*-
Copyright (C) 2002-2003, 2005-2024 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 <config.h>
#include "acl.h"
#include "acl-internal.h"
#include "minmax.h"
#if USE_ACL
# if ! defined HAVE_ACL_FROM_MODE && defined HAVE_ACL_FROM_TEXT /* FreeBSD, IRIX, Tru64, Cygwin >= 2.5 */
# if HAVE_ACL_GET_FILE && !HAVE_ACL_TYPE_EXTENDED
static acl_t
acl_from_mode (mode_t mode)
{
# if HAVE_ACL_FREE_TEXT /* Tru64 */
char acl_text[] = "u::---,g::---,o::---,";
# else /* FreeBSD, IRIX, Cygwin >= 2.5 */
char acl_text[] = "u::---,g::---,o::---";
# endif
if (mode & S_IRUSR) acl_text[ 3] = 'r';
if (mode & S_IWUSR) acl_text[ 4] = 'w';
if (mode & S_IXUSR) acl_text[ 5] = 'x';
if (mode & S_IRGRP) acl_text[10] = 'r';
if (mode & S_IWGRP) acl_text[11] = 'w';
if (mode & S_IXGRP) acl_text[12] = 'x';
if (mode & S_IROTH) acl_text[17] = 'r';
if (mode & S_IWOTH) acl_text[18] = 'w';
if (mode & S_IXOTH) acl_text[19] = 'x';
return acl_from_text (acl_text);
}
# endif
# endif
# if HAVE_FACL && defined GETACL /* Solaris, Cygwin < 2.5, not HP-UX */
static int
set_acls_from_mode (const char *name, int desc, mode_t mode, bool *must_chmod)
{
# ifdef ACE_GETACL
/* Solaris also has a different variant of ACLs, used in ZFS and NFSv4
file systems (whereas the other ones are used in UFS file systems). */
/* The flags in the ace_t structure changed in a binary incompatible way
when ACL_NO_TRIVIAL etc. were introduced in <sys/acl.h> version 1.15.
How to distinguish the two conventions at runtime?
We fetch the existing ACL. In the old convention, usually three ACEs have
a_flags = ACE_OWNER / ACE_GROUP / ACE_OTHER, in the range 0x0100..0x0400.
In the new convention, these values are not used. */
int convention;
{
/* Initially, try to read the entries into a stack-allocated buffer.
Use malloc if it does not fit. */
enum
{
alloc_init = 4000 / sizeof (ace_t), /* >= 3 */
alloc_max = MIN (INT_MAX, SIZE_MAX / sizeof (ace_t))
};
ace_t buf[alloc_init];
size_t alloc = alloc_init;
ace_t *entries = buf;
ace_t *malloced = NULL;
int count;
for (;;)
{
count = (desc != -1
? facl (desc, ACE_GETACL, alloc, entries)
: acl (name, ACE_GETACL, alloc, entries));
if (count < 0 && errno == ENOSPC)
{
/* Increase the size of the buffer. */
free (malloced);
if (alloc > alloc_max / 2)
{
errno = ENOMEM;
return -1;
}
alloc = 2 * alloc; /* <= alloc_max */
entries = malloced = (ace_t *) malloc (alloc * sizeof (ace_t));
if (entries == NULL)
{
errno = ENOMEM;
return -1;
}
continue;
}
break;
}
if (count <= 0)
convention = -1;
else
{
int i;
convention = 0;
for (i = 0; i < count; i++)
if (entries[i].a_flags & (OLD_ACE_OWNER | OLD_ACE_GROUP | OLD_ACE_OTHER))
{
convention = 1;
break;
}
}
free (malloced);
}
if (convention >= 0)
{
ace_t entries[6];
int count;
int ret;
if (convention)
{
/* Running on Solaris 10. */
entries[0].a_type = OLD_ALLOW;
entries[0].a_flags = OLD_ACE_OWNER;
entries[0].a_who = 0; /* irrelevant */
entries[0].a_access_mask = (mode >> 6) & 7;
entries[1].a_type = OLD_ALLOW;
entries[1].a_flags = OLD_ACE_GROUP;
entries[1].a_who = 0; /* irrelevant */
entries[1].a_access_mask = (mode >> 3) & 7;
entries[2].a_type = OLD_ALLOW;
entries[2].a_flags = OLD_ACE_OTHER;
entries[2].a_who = 0;
entries[2].a_access_mask = mode & 7;
count = 3;
}
else
{
/* Running on Solaris 10 (newer version) or Solaris 11.
The details here were found through "/bin/ls -lvd somefiles". */
entries[0].a_type = NEW_ACE_ACCESS_DENIED_ACE_TYPE;
entries[0].a_flags = NEW_ACE_OWNER;
entries[0].a_who = 0; /* irrelevant */
entries[0].a_access_mask = 0;
entries[1].a_type = NEW_ACE_ACCESS_ALLOWED_ACE_TYPE;
entries[1].a_flags = NEW_ACE_OWNER;
entries[1].a_who = 0; /* irrelevant */
entries[1].a_access_mask = NEW_ACE_WRITE_NAMED_ATTRS
| NEW_ACE_WRITE_ATTRIBUTES
| NEW_ACE_WRITE_ACL
| NEW_ACE_WRITE_OWNER;
if (mode & 0400)
entries[1].a_access_mask |= NEW_ACE_READ_DATA;
else
entries[0].a_access_mask |= NEW_ACE_READ_DATA;
if (mode & 0200)
entries[1].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
else
entries[0].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
if (mode & 0100)
entries[1].a_access_mask |= NEW_ACE_EXECUTE;
else
entries[0].a_access_mask |= NEW_ACE_EXECUTE;
entries[2].a_type = NEW_ACE_ACCESS_DENIED_ACE_TYPE;
entries[2].a_flags = NEW_ACE_GROUP | NEW_ACE_IDENTIFIER_GROUP;
entries[2].a_who = 0; /* irrelevant */
entries[2].a_access_mask = 0;
entries[3].a_type = NEW_ACE_ACCESS_ALLOWED_ACE_TYPE;
entries[3].a_flags = NEW_ACE_GROUP | NEW_ACE_IDENTIFIER_GROUP;
entries[3].a_who = 0; /* irrelevant */
entries[3].a_access_mask = 0;
if (mode & 0040)
entries[3].a_access_mask |= NEW_ACE_READ_DATA;
else
entries[2].a_access_mask |= NEW_ACE_READ_DATA;
if (mode & 0020)
entries[3].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
else
entries[2].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
if (mode & 0010)
entries[3].a_access_mask |= NEW_ACE_EXECUTE;
else
entries[2].a_access_mask |= NEW_ACE_EXECUTE;
entries[4].a_type = NEW_ACE_ACCESS_DENIED_ACE_TYPE;
entries[4].a_flags = NEW_ACE_EVERYONE;
entries[4].a_who = 0;
entries[4].a_access_mask = NEW_ACE_WRITE_NAMED_ATTRS
| NEW_ACE_WRITE_ATTRIBUTES
| NEW_ACE_WRITE_ACL
| NEW_ACE_WRITE_OWNER;
entries[5].a_type = NEW_ACE_ACCESS_ALLOWED_ACE_TYPE;
entries[5].a_flags = NEW_ACE_EVERYONE;
entries[5].a_who = 0;
entries[5].a_access_mask = NEW_ACE_READ_NAMED_ATTRS
| NEW_ACE_READ_ATTRIBUTES
| NEW_ACE_READ_ACL
| NEW_ACE_SYNCHRONIZE;
if (mode & 0004)
entries[5].a_access_mask |= NEW_ACE_READ_DATA;
else
entries[4].a_access_mask |= NEW_ACE_READ_DATA;
if (mode & 0002)
entries[5].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
else
entries[4].a_access_mask |= NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA;
if (mode & 0001)
entries[5].a_access_mask |= NEW_ACE_EXECUTE;
else
entries[4].a_access_mask |= NEW_ACE_EXECUTE;
count = 6;
}
if (desc != -1)
ret = facl (desc, ACE_SETACL, count, entries);
else
ret = acl (name, ACE_SETACL, count, entries);
if (ret < 0 && errno != EINVAL && errno != ENOTSUP)
{
if (errno == ENOSYS)
{
*must_chmod = true;
return 0;
}
return -1;
}
if (ret == 0)
return 0;
}
# endif
{
aclent_t entries[3];
int ret;
entries[0].a_type = USER_OBJ;
entries[0].a_id = 0; /* irrelevant */
entries[0].a_perm = (mode >> 6) & 7;
entries[1].a_type = GROUP_OBJ;
entries[1].a_id = 0; /* irrelevant */
entries[1].a_perm = (mode >> 3) & 7;
entries[2].a_type = OTHER_OBJ;
entries[2].a_id = 0;
entries[2].a_perm = mode & 7;
if (desc != -1)
ret = facl (desc, SETACL,
sizeof (entries) / sizeof (aclent_t), entries);
else
ret = acl (name, SETACL,
sizeof (entries) / sizeof (aclent_t), entries);
if (ret < 0)
{
if (errno == ENOSYS || errno == EOPNOTSUPP)
{
*must_chmod = true;
return 0;
}
return -1;
}
return 0;
}
}
# elif HAVE_GETACL /* HP-UX */
static int
context_acl_from_mode (struct permission_context *ctx, const char *name, int desc)
{
struct stat statbuf;
int ret;
if (desc != -1)
ret = fstat (desc, &statbuf);
else
ret = stat (name, &statbuf);
if (ret < 0)
return -1;
ctx->entries[0].uid = statbuf.st_uid;
ctx->entries[0].gid = ACL_NSGROUP;
ctx->entries[0].mode = (ctx->mode >> 6) & 7;
ctx->entries[1].uid = ACL_NSUSER;
ctx->entries[1].gid = statbuf.st_gid;
ctx->entries[1].mode = (ctx->mode >> 3) & 7;
ctx->entries[2].uid = ACL_NSUSER;
ctx->entries[2].gid = ACL_NSGROUP;
ctx->entries[2].mode = ctx->mode & 7;
ctx->count = 3;
return 0;
}
# if HAVE_ACLV_H /* HP-UX >= 11.11 */
static int
context_aclv_from_mode (struct permission_context *ctx)
{
int ret;
ctx->aclv_entries[0].a_type = USER_OBJ;
ctx->aclv_entries[0].a_id = 0; /* irrelevant */
ctx->aclv_entries[0].a_perm = (ctx->mode >> 6) & 7;
ctx->aclv_entries[1].a_type = GROUP_OBJ;
ctx->aclv_entries[1].a_id = 0; /* irrelevant */
ctx->aclv_entries[1].a_perm = (ctx->mode >> 3) & 7;
ctx->aclv_entries[2].a_type = CLASS_OBJ;
ctx->aclv_entries[2].a_id = 0;
ctx->aclv_entries[2].a_perm = (ctx->mode >> 3) & 7;
ctx->aclv_entries[3].a_type = OTHER_OBJ;
ctx->aclv_entries[3].a_id = 0;
ctx->aclv_entries[3].a_perm = ctx->mode & 7;
ctx->aclv_count = 4;
ret = aclsort (ctx->aclv_count, 1, ctx->aclv_entries);
if (ret > 0)
abort ();
return ret;
}
# endif
# elif HAVE_ACLX_GET && defined ACL_AIX_WIP /* AIX */
static int
set_acls_from_mode (const char *name, int desc, mode_t mode, bool *must_chmod)
{
acl_type_list_t types;
size_t types_size = sizeof (types);
acl_type_t type;
if (aclx_gettypes (name, &types, &types_size) < 0
|| types.num_entries == 0)
{
*must_chmod = true;
return 0;
}
/* XXX Do we need to clear all types of ACLs for the given file, or is it
sufficient to clear the first one? */
type = types.entries[0];
if (type.u64 == ACL_AIXC)
{
union { struct acl a; char room[128]; } u;
int ret;
u.a.acl_len = (char *) &u.a.acl_ext[0] - (char *) &u.a; /* no entries */
u.a.acl_mode = mode & ~(S_IXACL | 0777);
u.a.u_access = (mode >> 6) & 7;
u.a.g_access = (mode >> 3) & 7;
u.a.o_access = mode & 7;
if (desc != -1)
ret = aclx_fput (desc, SET_ACL | SET_MODE_S_BITS,
type, &u.a, u.a.acl_len, mode);
else
ret = aclx_put (name, SET_ACL | SET_MODE_S_BITS,
type, &u.a, u.a.acl_len, mode);
if (!(ret < 0 && errno == ENOSYS))
return ret;
}
else if (type.u64 == ACL_NFS4)
{
union { nfs4_acl_int_t a; char room[128]; } u;
nfs4_ace_int_t *ace;
int ret;
u.a.aclVersion = NFS4_ACL_INT_STRUCT_VERSION;
u.a.aclEntryN = 0;
ace = &u.a.aclEntry[0];
{
ace->flags = ACE4_ID_SPECIAL;
ace->aceWho.special_whoid = ACE4_WHO_OWNER;
ace->aceType = ACE4_ACCESS_ALLOWED_ACE_TYPE;
ace->aceFlags = 0;
ace->aceMask =
(mode & 0400 ? ACE4_READ_DATA | ACE4_LIST_DIRECTORY : 0)
| (mode & 0200
? ACE4_WRITE_DATA | ACE4_ADD_FILE | ACE4_APPEND_DATA
| ACE4_ADD_SUBDIRECTORY
: 0)
| (mode & 0100 ? ACE4_EXECUTE : 0);
ace->aceWhoString[0] = '\0';
ace->entryLen = (char *) &ace->aceWhoString[4] - (char *) ace;
ace = (nfs4_ace_int_t *) (char *) &ace->aceWhoString[4];
u.a.aclEntryN++;
}
{
ace->flags = ACE4_ID_SPECIAL;
ace->aceWho.special_whoid = ACE4_WHO_GROUP;
ace->aceType = ACE4_ACCESS_ALLOWED_ACE_TYPE;
ace->aceFlags = 0;
ace->aceMask =
(mode & 0040 ? ACE4_READ_DATA | ACE4_LIST_DIRECTORY : 0)
| (mode & 0020
? ACE4_WRITE_DATA | ACE4_ADD_FILE | ACE4_APPEND_DATA
| ACE4_ADD_SUBDIRECTORY
: 0)
| (mode & 0010 ? ACE4_EXECUTE : 0);
ace->aceWhoString[0] = '\0';
ace->entryLen = (char *) &ace->aceWhoString[4] - (char *) ace;
ace = (nfs4_ace_int_t *) (char *) &ace->aceWhoString[4];
u.a.aclEntryN++;
}
{
ace->flags = ACE4_ID_SPECIAL;
ace->aceWho.special_whoid = ACE4_WHO_EVERYONE;
ace->aceType = ACE4_ACCESS_ALLOWED_ACE_TYPE;
ace->aceFlags = 0;
ace->aceMask =
(mode & 0004 ? ACE4_READ_DATA | ACE4_LIST_DIRECTORY : 0)
| (mode & 0002
? ACE4_WRITE_DATA | ACE4_ADD_FILE | ACE4_APPEND_DATA
| ACE4_ADD_SUBDIRECTORY
: 0)
| (mode & 0001 ? ACE4_EXECUTE : 0);
ace->aceWhoString[0] = '\0';
ace->entryLen = (char *) &ace->aceWhoString[4] - (char *) ace;
ace = (nfs4_ace_int_t *) (char *) &ace->aceWhoString[4];
u.a.aclEntryN++;
}
u.a.aclLength = (char *) ace - (char *) &u.a;
if (desc != -1)
ret = aclx_fput (desc, SET_ACL | SET_MODE_S_BITS,
type, &u.a, u.a.aclLength, mode);
else
ret = aclx_put (name, SET_ACL | SET_MODE_S_BITS,
type, &u.a, u.a.aclLength, mode);
if (!(ret < 0 && errno == ENOSYS))
return ret;
}
*must_chmod = true;
return 0;
}
# elif HAVE_STATACL /* older AIX */
static int
context_acl_from_mode (struct permission_context *ctx)
{
ctx->u.a.acl_len = (char *) &ctx->u.a.acl_ext[0] - (char *) &ctx->u.a; /* no entries */
ctx->u.a.acl_mode = ctx->mode & ~(S_IXACL | 0777);
ctx->u.a.u_access = (ctx->mode >> 6) & 7;
ctx->u.a.g_access = (ctx->mode >> 3) & 7;
ctx->u.a.o_access = ctx->mode & 7;
ctx->have_u = true;
return 0;
}
# elif HAVE_ACLSORT /* NonStop Kernel */
static int
context_acl_from_mode (struct permission_context *ctx)
{
int ret;
ctx->entries[0].a_type = USER_OBJ;
ctx->entries[0].a_id = 0; /* irrelevant */
ctx->entries[0].a_perm = (ctx->mode >> 6) & 7;
ctx->entries[1].a_type = GROUP_OBJ;
ctx->entries[1].a_id = 0; /* irrelevant */
ctx->entries[1].a_perm = (ctx->mode >> 3) & 7;
ctx->entries[2].a_type = CLASS_OBJ;
ctx->entries[2].a_id = 0;
ctx->entries[2].a_perm = (ctx->mode >> 3) & 7;
ctx->entries[3].a_type = OTHER_OBJ;
ctx->entries[3].a_id = 0;
ctx->entries[3].a_perm = ctx->mode & 7;
ctx->count = 4;
ret = aclsort (ctx->count, 1, entries);
if (ret > 0)
abort ();
return ret;
}
# endif
static int
set_acls (struct permission_context *ctx, const char *name, int desc,
int from_mode, bool *must_chmod, bool *acls_set)
{
int ret = 0;
# if HAVE_ACL_GET_FILE
/* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
/* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */
# if !HAVE_ACL_TYPE_EXTENDED
/* Linux, FreeBSD, IRIX, Tru64, Cygwin >= 2.5 */
# ifndef HAVE_ACL_FROM_TEXT
# error Must have acl_from_text (see POSIX 1003.1e draft 17).
# endif
# ifndef HAVE_ACL_DELETE_DEF_FILE
# error Must have acl_delete_def_file (see POSIX 1003.1e draft 17).
# endif
if (! ctx->acls_not_supported)
{
if (ret == 0 && from_mode)
{
if (ctx->acl)
acl_free (ctx->acl);
ctx->acl = acl_from_mode (ctx->mode);
if (ctx->acl == NULL)
ret = -1;
}
if (ret == 0 && ctx->acl)
{
if (HAVE_ACL_SET_FD && desc != -1)
ret = acl_set_fd (desc, ctx->acl);
else
ret = acl_set_file (name, ACL_TYPE_ACCESS, ctx->acl);
if (ret != 0)
{
if (! acl_errno_valid (errno))
{
ctx->acls_not_supported = true;
if (from_mode || acl_access_nontrivial (ctx->acl) == 0)
ret = 0;
}
}
else
{
*acls_set = true;
if (S_ISDIR(ctx->mode))
{
if (! from_mode && ctx->default_acl &&
acl_default_nontrivial (ctx->default_acl))
ret = acl_set_file (name, ACL_TYPE_DEFAULT,
ctx->default_acl);
else
ret = acl_delete_def_file (name);
}
}
}
}
# if HAVE_ACL_TYPE_NFS4 /* FreeBSD */
/* File systems either support POSIX ACLs (for example, ufs) or NFS4 ACLs
(for example, zfs). */
/* TODO: Implement setting ACLs once get_permissions() reads them. */
# endif
# else /* HAVE_ACL_TYPE_EXTENDED */
/* Mac OS X */
/* On Mac OS X, acl_get_file (name, ACL_TYPE_ACCESS)
and acl_get_file (name, ACL_TYPE_DEFAULT)
always return NULL / EINVAL. You have to use
acl_get_file (name, ACL_TYPE_EXTENDED)
or acl_get_fd (open (name, ...))
to retrieve an ACL.
On the other hand,
acl_set_file (name, ACL_TYPE_ACCESS, acl)
and acl_set_file (name, ACL_TYPE_DEFAULT, acl)
have the same effect as
acl_set_file (name, ACL_TYPE_EXTENDED, acl):
Each of these calls sets the file's ACL. */
if (ctx->acl == NULL)
{
acl_t acl;
/* Remove ACLs if the file has ACLs. */
if (HAVE_ACL_GET_FD && desc != -1)
acl = acl_get_fd (desc);
else
acl = acl_get_file (name, ACL_TYPE_EXTENDED);
if (acl)
{
acl_free (acl);
acl = acl_init (0);
if (acl)
{
if (HAVE_ACL_SET_FD && desc != -1)
ret = acl_set_fd (desc, acl);
else
ret = acl_set_file (name, ACL_TYPE_EXTENDED, acl);
acl_free (acl);
}
else
ret = -1;
}
}
else
{
if (HAVE_ACL_SET_FD && desc != -1)
ret = acl_set_fd (desc, ctx->acl);
else
ret = acl_set_file (name, ACL_TYPE_EXTENDED, ctx->acl);
if (ret != 0)
{
if (! acl_errno_valid (errno)
&& ! acl_extended_nontrivial (ctx->acl))
ret = 0;
}
}
*acls_set = true;
# endif
# elif defined GETACL /* Solaris, Cygwin, not HP-UX */
/* Solaris 2.5 through Solaris 10, Cygwin, and contemporaneous versions
of Unixware. The acl() call returns the access and default ACL both
at once. */
/* If both ace_entries and entries are available, try SETACL before
ACE_SETACL, because SETACL cannot fail with ENOTSUP whereas ACE_SETACL
can. */
if (from_mode)
return set_acls_from_mode (name, desc, ctx->mode, must_chmod);
if (ret == 0 && ctx->count)
{
if (desc != -1)
ret = facl (desc, SETACL, ctx->count, ctx->entries);
else
ret = acl (name, SETACL, ctx->count, ctx->entries);
if (ret < 0)
{
if ((errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL)
&& acl_nontrivial (ctx->count, ctx->entries) == 0)
ret = 0;
}
else
*acls_set = true;
}
# ifdef ACE_GETACL
if (ret == 0 && ctx->ace_count)
{
if (desc != -1)
ret = facl (desc, ACE_SETACL, ctx->ace_count, ctx->ace_entries);
else
ret = acl (name, ACE_SETACL, ctx->ace_count, ctx->ace_entries);
if (ret < 0)
{
if ((errno == ENOSYS || errno == EINVAL || errno == ENOTSUP)
&& acl_ace_nontrivial (ctx->ace_count, ctx->ace_entries) == 0)
ret = 0;
}
else
*acls_set = true;
}
# endif
# elif HAVE_GETACL /* HP-UX */
if (from_mode)
ret = context_acl_from_mode (ctx, name, desc);
if (ret == 0 && ctx->count > 0)
{
if (desc != -1)
ret = fsetacl (desc, ctx->count, ctx->entries);
else
ret = setacl (name, ctx->count, ctx->entries);
if (ret < 0)
{
if ((errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP)
&& (from_mode || !acl_nontrivial (ctx->count, ctx->entries)))
ret = 0;
}
else
*acls_set = true;
}
# if HAVE_ACLV_H
if (from_mode)
ret = context_aclv_from_mode (ctx);
if (ret == 0 && ctx->aclv_count > 0)
{
ret = acl ((char *) name, ACL_SET, ctx->aclv_count, ctx->aclv_entries);
if (ret < 0)
{
if ((errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL)
&& (from_mode || !aclv_nontrivial (ctx->aclv_count, ctx->aclv_entries)))
ret = 0;
}
else
*acls_set = true;
}
# endif
# elif HAVE_ACLX_GET && ACL_AIX_WIP /* AIX */
/* TODO: Implement setting ACLs once get_permissions() reads them. */
if (from_mode)
ret = set_acls_from_mode (name, desc, mode, must_chmod);
# elif HAVE_STATACL /* older AIX */
if (from_mode)
ret = context_acl_from_mode (ctx);
if (ret == 0 && ctx->have_u)
{
if (desc != -1)
ret = fchacl (desc, &ctx->u.a, ctx->u.a.acl_len);
else
ret = chacl ((char *) name, &ctx->u.a, ctx->u.a.acl_len);
if (ret < 0)
{
if (errno == ENOSYS && from_mode)
ret = 0;
}
else
*acls_set = true;
}
# elif HAVE_ACLSORT /* NonStop Kernel */
if (from_mode)
ret = context_acl_from_mode (ctx);
if (ret == 0 && ctx->count)
{
ret = acl ((char *) name, ACL_SET, ctx->count, ctx->entries);
if (ret != 0)
{
if (!acl_nontrivial (ctx->count, ctx->entries))
ret = 0;
}
else
*acls_set = true;
}
# else /* No ACLs */
/* Nothing to do. */
# endif
return ret;
}
#endif
/* If DESC is a valid file descriptor use fchmod to change the
file's mode to MODE on systems that have fchmod. On systems
that don't have fchmod and if DESC is invalid, use chmod on
NAME instead.
Return 0 if successful. Return -1 and set errno upon failure. */
int
chmod_or_fchmod (const char *name, int desc, mode_t mode)
{
if (HAVE_FCHMOD && desc != -1)
return fchmod (desc, mode);
else
return chmod (name, mode);
}
/* Set the permissions in CTX on a file. If DESC is a valid file descriptor,
use file descriptor operations, else use filename based operations on NAME.
If access control lists are not available, fchmod the target file to the
mode in CTX. Also sets the non-permission bits of the destination file
(S_ISUID, S_ISGID, S_ISVTX) to those from the mode in CTX if any are set.
Return 0 if successful. Return -1 and set errno upon failure. */
int
set_permissions (struct permission_context *ctx, const char *name, int desc)
{
_GL_UNUSED bool acls_set = false;
bool early_chmod;
bool must_chmod = false;
int ret = 0;
#if USE_ACL
# if HAVE_STATACL
/* older AIX */
/* There is no need to call chmod_or_fchmod, since the mode
bits S_ISUID, S_ISGID, S_ISVTX are also stored in the ACL. */
early_chmod = false;
# else
/* All other platforms */
/* On Cygwin, it is necessary to call chmod before acl, because
chmod can change the contents of the ACL (in ways that don't
change the allowed accesses, but still visible). */
early_chmod = (! MODE_INSIDE_ACL || (ctx->mode & (S_ISUID | S_ISGID | S_ISVTX)));
# endif
#else
/* No ACLs */
early_chmod = true;
#endif
if (early_chmod)
{
ret = chmod_or_fchmod (name, desc, ctx->mode);
if (ret != 0)
return -1;
}
#if USE_ACL
ret = set_acls (ctx, name, desc, false, &must_chmod, &acls_set);
if (! acls_set)
{
int saved_errno = ret ? errno : 0;
/* If we can't set an acl which we expect to be able to set, try setting
the permissions to ctx->mode. Due to possible inherited permissions,
we cannot simply chmod. */
ret = set_acls (ctx, name, desc, true, &must_chmod, &acls_set);
if (! acls_set)
must_chmod = true;
if (saved_errno)
{
errno = saved_errno;
ret = -1;
}
}
#endif
if (must_chmod && ! early_chmod)
{
int saved_errno = ret ? errno : 0;
ret = chmod_or_fchmod (name, desc, ctx->mode);
if (saved_errno)
{
errno = saved_errno;
ret = -1;
}
}
return ret;
}
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