/* acl.c - access control lists
- Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
- Written by Paul Eggert. */
+ Written by Paul Eggert and Andreas Gruenbacher. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#ifndef S_ISLNK
-# define S_ISLNK(Mode) 0
-#endif
+#include <config.h>
#include "acl.h"
-#include <errno.h>
-#ifndef ENOSYS
-# define ENOSYS (-1)
-#endif
+#include "acl-internal.h"
-#ifndef MIN_ACL_ENTRIES
-# define MIN_ACL_ENTRIES 4
-#endif
+/* If DESC is a valid file descriptor use fchmod to change the
+ file's mode to MODE on systems that have fchown. On systems
+ that don't have fchown and if DESC is invalid, use chown on
+ NAME instead. */
+
+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);
+}
-/* Return 1 if FILE has a nontrivial access control list, 0 if not,
- and -1 (setting errno) if an error is encountered. */
+/* Copy access control lists from one file to another. If SOURCE_DESC is
+ a valid file descriptor, use file descriptor operations, else use
+ filename based operations on SRC_NAME. Likewise for DEST_DESC and
+ DST_NAME.
+ 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. */
int
-file_has_acl (char const *file, struct stat const *filestat)
+copy_acl (const char *src_name, int source_desc, const char *dst_name,
+ int dest_desc, mode_t mode)
{
- /* FIXME: This implementation should work on recent-enough versions
- of HP-UX, Solaris, and Unixware, but it simply returns 0 with
- POSIX 1003.1e (draft 17 -- abandoned), AIX, GNU/Linux, Irix, and
- Tru64. Please see Samba's source/lib/sysacls.c file for
- fix-related ideas. */
+ int ret;
+
+#if USE_ACL && HAVE_ACL_GET_FILE && HAVE_ACL_SET_FILE && HAVE_ACL_FREE
+ /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
+
+ acl_t acl;
+ if (HAVE_ACL_GET_FD && source_desc != -1)
+ acl = acl_get_fd (source_desc);
+ else
+ acl = acl_get_file (src_name, ACL_TYPE_ACCESS);
+ if (acl == NULL)
+ {
+ if (ACL_NOT_WELL_SUPPORTED (errno))
+ return set_acl (dst_name, dest_desc, mode);
+ else
+ {
+ error (0, errno, "%s", quote (src_name));
+ return -1;
+ }
+ }
+
+ if (HAVE_ACL_SET_FD && dest_desc != -1)
+ ret = acl_set_fd (dest_desc, acl);
+ else
+ ret = acl_set_file (dst_name, ACL_TYPE_ACCESS, acl);
+ if (ret != 0)
+ {
+ int saved_errno = errno;
+
+ if (ACL_NOT_WELL_SUPPORTED (errno))
+ {
+ int n = acl_entries (acl);
+
+ acl_free (acl);
+ /* On most hosts an ACL is trivial if n == 3, and it cannot be
+ less than 3. On IRIX 6.5 it is also trivial if n == -1.
+ For simplicity and safety, assume the ACL is trivial if n <= 3.
+ Also see file-has-acl.c for some of the other possibilities;
+ it's not clear whether that complexity is needed here. */
+ if (n <= 3)
+ {
+ 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);
+ }
+ else
+ {
+ acl_free (acl);
+ chmod_or_fchmod (dst_name, dest_desc, mode);
+ }
+ error (0, saved_errno, _("preserving permissions for %s"),
+ quote (dst_name));
+ return -1;
+ }
+ else
+ acl_free (acl);
-#if HAVE_ACL && defined GETACLCNT
- if (! S_ISLNK (filestat->st_mode))
+ if (mode & (S_ISUID | S_ISGID | S_ISVTX))
{
- int n = acl (file, GETACLCNT, 0, NULL);
- return n < 0 ? (errno == ENOSYS ? 0 : -1) : (MIN_ACL_ENTRIES < n);
+ /* We did not call chmod so far, so the special bits have not yet
+ been set. */
+
+ if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0)
+ {
+ error (0, errno, _("preserving permissions for %s"),
+ quote (dst_name));
+ return -1;
+ }
+ }
+
+ if (S_ISDIR (mode))
+ {
+ acl = acl_get_file (src_name, ACL_TYPE_DEFAULT);
+ if (acl == NULL)
+ {
+ error (0, errno, "%s", quote (src_name));
+ return -1;
+ }
+
+ if (acl_set_file (dst_name, ACL_TYPE_DEFAULT, acl))
+ {
+ error (0, errno, _("preserving permissions for %s"),
+ quote (dst_name));
+ acl_free (acl);
+ return -1;
+ }
+ else
+ acl_free (acl);
+ }
+ return 0;
+
+#else
+
+# if USE_ACL && defined ACL_NO_TRIVIAL
+ /* Solaris 10 NFSv4 ACLs. */
+ 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)
+ {
+ error (0, errno, "%s", quote (src_name));
+ return ret;
+ }
+# endif
+
+ ret = qset_acl (dst_name, dest_desc, mode);
+ if (ret != 0)
+ error (0, errno, _("preserving permissions for %s"), quote (dst_name));
+
+# if USE_ACL && defined ACL_NO_TRIVIAL
+ if (ret == 0 && aclp)
+ {
+ ret = (dest_desc < 0
+ ? acl_set (dst_name, aclp)
+ : facl_set (dest_desc, aclp));
+ if (ret != 0)
+ error (0, errno, _("preserving permissions for %s"), quote (dst_name));
+ acl_free (aclp);
}
+# endif
+
+ return ret;
#endif
+}
+/* Set the access control lists of a file. If DESC is a valid file
+ descriptor, use file descriptor operations where available, else use
+ filename based operations on NAME. 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. System call return value
+ semantics. */
+
+int
+qset_acl (char const *name, int desc, mode_t mode)
+{
+#if USE_ACL && HAVE_ACL_SET_FILE && HAVE_ACL_FREE
+ /* POSIX 1003.1e draft 17 (abandoned) specific version. */
+
+ /* We must also have have_acl_from_text and acl_delete_def_file.
+ (acl_delete_def_file could be emulated with acl_init followed
+ by acl_set_file, but acl_set_file with an empty acl is
+ unspecified.) */
+
+# 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
+
+ acl_t acl;
+ int ret;
+
+ if (HAVE_ACL_FROM_MODE)
+ {
+ acl = acl_from_mode (mode);
+ if (!acl)
+ return -1;
+ }
+ else
+ {
+ char acl_text[] = "u::---,g::---,o::---";
+
+ 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';
+
+ acl = acl_from_text (acl_text);
+ if (!acl)
+ return -1;
+ }
+ if (HAVE_ACL_SET_FD && desc != -1)
+ ret = acl_set_fd (desc, acl);
+ else
+ ret = acl_set_file (name, ACL_TYPE_ACCESS, acl);
+ if (ret != 0)
+ {
+ int saved_errno = errno;
+ acl_free (acl);
+
+ if (ACL_NOT_WELL_SUPPORTED (errno))
+ {
+ if (chmod_or_fchmod (name, desc, mode) != 0)
+ saved_errno = errno;
+ else
+ return 0;
+ }
+ errno = saved_errno;
+ return -1;
+ }
+ else
+ acl_free (acl);
+
+ if (S_ISDIR (mode) && acl_delete_def_file (name))
+ return -1;
+
+ if (mode & (S_ISUID | S_ISGID | S_ISVTX))
+ {
+ /* We did not call chmod so far, so the special bits have not yet
+ been set. */
+
+ if (chmod_or_fchmod (name, desc, mode))
+ return -1;
+ }
return 0;
+#else
+
+# if USE_ACL && defined ACL_NO_TRIVIAL
+
+ /* Solaris 10, with NFSv4 ACLs. */
+ acl_t *aclp;
+ char acl_text[] = "user::---,group::---,mask:---,other:---";
+
+ if (mode & S_IRUSR) acl_text[ 6] = 'r';
+ if (mode & S_IWUSR) acl_text[ 7] = 'w';
+ if (mode & S_IXUSR) acl_text[ 8] = 'x';
+ if (mode & S_IRGRP) acl_text[17] = acl_text[26] = 'r';
+ if (mode & S_IWGRP) acl_text[18] = acl_text[27] = 'w';
+ if (mode & S_IXGRP) acl_text[19] = acl_text[28] = 'x';
+ if (mode & S_IROTH) acl_text[36] = 'r';
+ if (mode & S_IWOTH) acl_text[37] = 'w';
+ if (mode & S_IXOTH) acl_text[38] = 'x';
+
+ if (acl_fromtext (acl_text, &aclp) != 0)
+ {
+ errno = ENOMEM;
+ return -1;
+ }
+ else
+ {
+ int acl_result = (desc < 0 ? acl_set (name, aclp) : facl_set (desc, aclp));
+ int acl_errno = errno;
+ acl_free (aclp);
+ if (acl_result == 0 || acl_errno != ENOSYS)
+ {
+ errno = acl_errno;
+ return acl_result;
+ }
+ }
+# endif
+
+ return chmod_or_fchmod (name, desc, mode);
+
+#endif
+}
+
+/* As with qset_acl, but also output a diagnostic on failure. */
+
+int
+set_acl (char const *name, int desc, mode_t mode)
+{
+ int r = qset_acl (name, desc, mode);
+ if (r != 0)
+ error (0, errno, _("setting permissions for %s"), quote (name));
+ return r;
}
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