/* copy-acl.c - copy access control list from one file to another file
- Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
+ Copyright (C) 2002-2003, 2005-2013 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
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
- Written by Paul Eggert and Andreas Gruenbacher. */
+ Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */
#include <config.h>
#include "acl-internal.h"
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
/* Copy access control lists from one file to another. If SOURCE_DESC is
a valid file descriptor, use file descriptor operations, else use
Return -2 and set errno for an error relating to the source file.
Return -1 and set errno for an error relating to the destination file. */
-static int
+int
qcopy_acl (const char *src_name, int source_desc, const char *dst_name,
- int dest_desc, mode_t mode)
+ int dest_desc, mode_t mode)
{
#if USE_ACL && HAVE_ACL_GET_FILE
/* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
- /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
+ /* Linux, FreeBSD, Mac OS X, IRIX, Tru64 */
+# if !HAVE_ACL_TYPE_EXTENDED
+ /* Linux, FreeBSD, IRIX, Tru64 */
acl_t acl;
int ret;
if (acl == NULL)
{
if (ACL_NOT_WELL_SUPPORTED (errno))
- return qset_acl (dst_name, dest_desc, mode);
+ return qset_acl (dst_name, dest_desc, mode);
else
return -2;
}
{
int saved_errno = errno;
- if (ACL_NOT_WELL_SUPPORTED (errno))
+ if (ACL_NOT_WELL_SUPPORTED (errno) && !acl_access_nontrivial (acl))
{
- int nontrivial = acl_access_nontrivial (acl);
-
- acl_free (acl);
-
- if (!nontrivial)
- {
- if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
- saved_errno = errno;
- else
- return 0;
- }
- else
- chmod_or_fchmod (dst_name, dest_desc, mode);
- }
+ acl_free (acl);
+ return chmod_or_fchmod (dst_name, dest_desc, mode);
+ }
else
- {
- acl_free (acl);
- chmod_or_fchmod (dst_name, dest_desc, mode);
- }
- errno = saved_errno;
- return -1;
+ {
+ acl_free (acl);
+ chmod_or_fchmod (dst_name, dest_desc, mode);
+ errno = saved_errno;
+ return -1;
+ }
}
else
acl_free (acl);
if (!MODE_INSIDE_ACL || (mode & (S_ISUID | S_ISGID | S_ISVTX)))
{
/* We did not call chmod so far, and either the mode and the ACL are
- separate or special bits are to be set which don't fit into ACLs. */
+ separate or special bits are to be set which don't fit into ACLs. */
if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
- return -1;
+ return -1;
}
if (S_ISDIR (mode))
{
acl = acl_get_file (src_name, ACL_TYPE_DEFAULT);
if (acl == NULL)
- return -2;
+ return -2;
if (acl_set_file (dst_name, ACL_TYPE_DEFAULT, acl))
- {
- int saved_errno = errno;
+ {
+ int saved_errno = errno;
- acl_free (acl);
- errno = saved_errno;
- return -1;
- }
+ acl_free (acl);
+ errno = saved_errno;
+ return -1;
+ }
else
acl_free (acl);
}
return 0;
-#elif USE_ACL && defined ACL_NO_TRIVIAL
- /* Solaris 10 NFSv4 ACLs. */
+# 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. */
+ acl_t acl;
int ret;
- acl_t *aclp = NULL;
- ret = (source_desc < 0
- ? acl_get (src_name, ACL_NO_TRIVIAL, &aclp)
- : facl_get (source_desc, ACL_NO_TRIVIAL, &aclp));
- if (ret != 0 && errno != ENOSYS)
- return -2;
- ret = qset_acl (dst_name, dest_desc, mode);
+ if (HAVE_ACL_GET_FD && source_desc != -1)
+ acl = acl_get_fd (source_desc);
+ else
+ acl = acl_get_file (src_name, ACL_TYPE_EXTENDED);
+ if (acl == NULL)
+ {
+ if (ACL_NOT_WELL_SUPPORTED (errno))
+ return qset_acl (dst_name, dest_desc, mode);
+ else
+ return -2;
+ }
+
+ if (HAVE_ACL_SET_FD && dest_desc != -1)
+ ret = acl_set_fd (dest_desc, acl);
+ else
+ ret = acl_set_file (dst_name, ACL_TYPE_EXTENDED, acl);
if (ret != 0)
- return -1;
+ {
+ int saved_errno = errno;
+
+ if (ACL_NOT_WELL_SUPPORTED (errno) && !acl_extended_nontrivial (acl))
+ {
+ acl_free (acl);
+ return chmod_or_fchmod (dst_name, dest_desc, mode);
+ }
+ else
+ {
+ acl_free (acl);
+ chmod_or_fchmod (dst_name, dest_desc, mode);
+ errno = saved_errno;
+ return -1;
+ }
+ }
+ else
+ acl_free (acl);
+
+ /* Since !MODE_INSIDE_ACL, we have to call chmod explicitly. */
+ return chmod_or_fchmod (dst_name, dest_desc, mode);
+
+# endif
+
+#elif USE_ACL && 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. */
+# ifdef ACE_GETACL
+ int ace_count;
+ ace_t *ace_entries;
+# endif
+ int count;
+ aclent_t *entries;
+ int did_chmod;
+ int saved_errno;
+ int ret;
+
+# 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).
+ There is an API
+ pathconf (name, _PC_ACL_ENABLED)
+ fpathconf (desc, _PC_ACL_ENABLED)
+ that allows to determine which of the two kinds of ACLs is supported
+ for the given file. But some file systems may implement this call
+ incorrectly, so better not use it.
+ When fetching the source ACL, we simply fetch both ACL types.
+ When setting the destination ACL, we try either ACL types, assuming
+ that the kernel will translate the ACL from one form to the other.
+ (See in <http://docs.sun.com/app/docs/doc/819-2241/6n4huc7ia?l=en&a=view>
+ the description of ENOTSUP.) */
+ for (;;)
+ {
+ ace_count = (source_desc != -1
+ ? facl (source_desc, ACE_GETACLCNT, 0, NULL)
+ : acl (src_name, ACE_GETACLCNT, 0, NULL));
+
+ if (ace_count < 0)
+ {
+ if (errno == ENOSYS || errno == EINVAL)
+ {
+ ace_count = 0;
+ ace_entries = NULL;
+ break;
+ }
+ else
+ return -2;
+ }
+
+ if (ace_count == 0)
+ {
+ ace_entries = NULL;
+ break;
+ }
+
+ ace_entries = (ace_t *) malloc (ace_count * sizeof (ace_t));
+ if (ace_entries == NULL)
+ {
+ errno = ENOMEM;
+ return -2;
+ }
+
+ ret = (source_desc != -1
+ ? facl (source_desc, ACE_GETACL, ace_count, ace_entries)
+ : acl (src_name, ACE_GETACL, ace_count, ace_entries));
+ if (ret < 0)
+ {
+ free (ace_entries);
+ if (errno == ENOSYS || errno == EINVAL)
+ {
+ ace_count = 0;
+ ace_entries = NULL;
+ break;
+ }
+ else
+ return -2;
+ }
+ if (ret == ace_count)
+ break;
+ /* Huh? The number of ACL entries changed since the last call.
+ Repeat. */
+ }
+# endif
+
+ for (;;)
+ {
+ count = (source_desc != -1
+ ? facl (source_desc, GETACLCNT, 0, NULL)
+ : acl (src_name, GETACLCNT, 0, NULL));
+
+ if (count < 0)
+ {
+ if (errno == ENOSYS || errno == ENOTSUP || errno == EOPNOTSUPP)
+ {
+ count = 0;
+ entries = NULL;
+ break;
+ }
+ else
+ return -2;
+ }
+
+ if (count == 0)
+ {
+ entries = NULL;
+ break;
+ }
+
+ entries = (aclent_t *) malloc (count * sizeof (aclent_t));
+ if (entries == NULL)
+ {
+ errno = ENOMEM;
+ return -2;
+ }
+
+ if ((source_desc != -1
+ ? facl (source_desc, GETACL, count, entries)
+ : acl (src_name, GETACL, count, entries))
+ == count)
+ break;
+ /* Huh? The number of ACL entries changed since the last call.
+ Repeat. */
+ }
+
+ /* Is there an ACL of either kind? */
+# ifdef ACE_GETACL
+ if (ace_count == 0)
+# endif
+ if (count == 0)
+ return qset_acl (dst_name, dest_desc, mode);
+
+ did_chmod = 0; /* set to 1 once the mode bits in 0777 have been set */
+ saved_errno = 0; /* the first non-ignorable error code */
+
+ if (!MODE_INSIDE_ACL)
+ {
+ /* 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). */
+ if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
+ saved_errno = errno;
+ did_chmod = 1;
+ }
+
+ /* If both ace_entries and entries are available, try SETACL before
+ ACE_SETACL, because SETACL cannot fail with ENOTSUP whereas ACE_SETACL
+ can. */
+
+ if (count > 0)
+ {
+ ret = (dest_desc != -1
+ ? facl (dest_desc, SETACL, count, entries)
+ : acl (dst_name, SETACL, count, entries));
+ if (ret < 0 && saved_errno == 0)
+ {
+ saved_errno = errno;
+ if ((errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL)
+ && !acl_nontrivial (count, entries))
+ saved_errno = 0;
+ }
+ else
+ did_chmod = 1;
+ }
+ free (entries);
+
+# ifdef ACE_GETACL
+ if (ace_count > 0)
+ {
+ ret = (dest_desc != -1
+ ? facl (dest_desc, ACE_SETACL, ace_count, ace_entries)
+ : acl (dst_name, ACE_SETACL, ace_count, ace_entries));
+ if (ret < 0 && saved_errno == 0)
+ {
+ saved_errno = errno;
+ if ((errno == ENOSYS || errno == EINVAL || errno == ENOTSUP)
+ && !acl_ace_nontrivial (ace_count, ace_entries))
+ saved_errno = 0;
+ }
+ }
+ free (ace_entries);
+# endif
+
+ if (MODE_INSIDE_ACL
+ && did_chmod <= ((mode & (S_ISUID | S_ISGID | S_ISVTX)) ? 1 : 0))
+ {
+ /* We did not call chmod so far, and either the mode and the ACL are
+ separate or special bits are to be set which don't fit into ACLs. */
+
+ if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
+ {
+ if (saved_errno == 0)
+ saved_errno = errno;
+ }
+ }
+
+ if (saved_errno)
+ {
+ errno = saved_errno;
+ return -1;
+ }
+ return 0;
+
+#elif USE_ACL && HAVE_GETACL /* HP-UX */
+
+ struct acl_entry entries[NACLENTRIES];
+ int count;
+# if HAVE_ACLV_H
+ struct acl aclv_entries[NACLVENTRIES];
+ int aclv_count;
+# endif
+ int did_chmod;
+ int saved_errno;
+ int ret;
+
+ count = (source_desc != -1
+ ? fgetacl (source_desc, NACLENTRIES, entries)
+ : getacl (src_name, NACLENTRIES, entries));
+
+ if (count < 0)
+ {
+ if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP)
+ count = 0;
+ else
+ return -2;
+ }
+ else if (count > 0)
+ {
+ if (count > NACLENTRIES)
+ /* If NACLENTRIES cannot be trusted, use dynamic memory allocation. */
+ abort ();
+ }
+
+# if HAVE_ACLV_H
+ aclv_count = acl ((char *) src_name, ACL_GET, NACLVENTRIES, aclv_entries);
+
+ if (aclv_count < 0)
+ {
+ if (errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL)
+ count = 0;
+ else
+ return -2;
+ }
+ else if (aclv_count > 0)
+ {
+ if (aclv_count > NACLVENTRIES)
+ /* If NACLVENTRIES cannot be trusted, use dynamic memory allocation. */
+ abort ();
+ }
+# endif
+
+ if (count == 0)
+# if HAVE_ACLV_H
+ if (aclv_count == 0)
+# endif
+ return qset_acl (dst_name, dest_desc, mode);
+
+ did_chmod = 0; /* set to 1 once the mode bits in 0777 have been set */
+ saved_errno = 0; /* the first non-ignorable error code */
+
+ if (count > 0)
+ {
+ ret = (dest_desc != -1
+ ? fsetacl (dest_desc, count, entries)
+ : setacl (dst_name, count, entries));
+ if (ret < 0 && saved_errno == 0)
+ {
+ saved_errno = errno;
+ if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP)
+ {
+ struct stat source_statbuf;
+
+ if ((source_desc != -1
+ ? fstat (source_desc, &source_statbuf)
+ : stat (src_name, &source_statbuf)) == 0)
+ {
+ if (!acl_nontrivial (count, entries, &source_statbuf))
+ saved_errno = 0;
+ }
+ else
+ saved_errno = errno;
+ }
+ }
+ else
+ did_chmod = 1;
+ }
+
+# if HAVE_ACLV_H
+ if (aclv_count > 0)
+ {
+ ret = acl ((char *) dst_name, ACL_SET, aclv_count, aclv_entries);
+ if (ret < 0 && saved_errno == 0)
+ {
+ saved_errno = errno;
+ if (errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL)
+ {
+ if (!aclv_nontrivial (aclv_count, aclv_entries))
+ saved_errno = 0;
+ }
+ }
+ else
+ did_chmod = 1;
+ }
+# endif
+
+ if (did_chmod <= ((mode & (S_ISUID | S_ISGID | S_ISVTX)) ? 1 : 0))
+ {
+ /* We did not call chmod so far, and special bits are to be set which
+ don't fit into ACLs. */
+
+ if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
+ {
+ if (saved_errno == 0)
+ saved_errno = errno;
+ }
+ }
+
+ if (saved_errno)
+ {
+ errno = saved_errno;
+ return -1;
+ }
+ return 0;
+
+#elif USE_ACL && HAVE_ACLX_GET && 0 /* AIX */
+
+ /* TODO */
+
+#elif USE_ACL && HAVE_STATACL /* older AIX */
+
+ union { struct acl a; char room[4096]; } u;
+ int ret;
+
+ if ((source_desc != -1
+ ? fstatacl (source_desc, STX_NORMAL, &u.a, sizeof (u))
+ : statacl (src_name, STX_NORMAL, &u.a, sizeof (u)))
+ < 0)
+ return -2;
+
+ ret = (dest_desc != -1
+ ? fchacl (dest_desc, &u.a, u.a.acl_len)
+ : chacl (dst_name, &u.a, u.a.acl_len));
+ if (ret < 0)
+ {
+ int saved_errno = errno;
+
+ chmod_or_fchmod (dst_name, dest_desc, mode);
+ errno = saved_errno;
+ return -1;
+ }
+
+ /* No need to call chmod_or_fchmod at this point, since the mode bits
+ S_ISUID, S_ISGID, S_ISVTX are also stored in the ACL. */
+
+ return 0;
+
+#elif USE_ACL && HAVE_ACLSORT /* NonStop Kernel */
+
+ struct acl entries[NACLENTRIES];
+ int count;
+ int ret;
+
+ count = acl ((char *) src_name, ACL_GET, NACLENTRIES, entries);
- if (aclp)
+ if (count < 0)
+ {
+ if (0)
+ count = 0;
+ else
+ return -2;
+ }
+ else if (count > 0)
{
- ret = (dest_desc < 0
- ? acl_set (dst_name, aclp)
- : facl_set (dest_desc, aclp));
- if (ret != 0)
- {
- int saved_errno = errno;
+ if (count > NACLENTRIES)
+ /* If NACLENTRIES cannot be trusted, use dynamic memory allocation. */
+ abort ();
+ }
+
+ if (count == 0)
+ return qset_acl (dst_name, dest_desc, mode);
+
+ ret = acl ((char *) dst_name, ACL_SET, count, entries);
+ if (ret < 0)
+ {
+ int saved_errno = errno;
- acl_free (aclp);
- errno = saved_errno;
- return -1;
- }
- acl_free (aclp);
+ if (0)
+ {
+ if (!acl_nontrivial (count, entries))
+ return chmod_or_fchmod (dst_name, dest_desc, mode);
+ }
+
+ chmod_or_fchmod (dst_name, dest_desc, mode);
+ errno = saved_errno;
+ return -1;
}
+ if (mode & (S_ISUID | S_ISGID | S_ISVTX))
+ {
+ /* We did not call chmod so far, and either the mode and the ACL are
+ separate or special bits are to be set which don't fit into ACLs. */
+
+ return chmod_or_fchmod (dst_name, dest_desc, mode);
+ }
return 0;
#else
If access control lists are not available, fchmod the target file to
MODE. Also sets the non-permission bits of the destination file
(S_ISUID, S_ISGID, S_ISVTX) to those from MODE if any are set.
- Return 0 if successful, otherwise output a diagnostic and return -1. */
+ Return 0 if successful, otherwise output a diagnostic and return a
+ negative error code. */
int
copy_acl (const char *src_name, int source_desc, const char *dst_name,
- int dest_desc, mode_t mode)
+ int dest_desc, mode_t mode)
{
int ret = qcopy_acl (src_name, source_desc, dst_name, dest_desc, mode);
switch (ret)
{
case -2:
error (0, errno, "%s", quote (src_name));
- return -1;
+ break;
case -1:
error (0, errno, _("preserving permissions for %s"), quote (dst_name));
- return -1;
+ break;
default:
- return 0;
+ break;
}
+ return ret;
}
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