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-rw-r--r--lib/acl.c256
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diff --git a/lib/acl.c b/lib/acl.c
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+/* acl.c - access control lists
+
+ Copyright (C) 2002, 2003, 2005, 2006, 2007 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 2, 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, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+ Written by Paul Eggert and Andreas Gruenbacher. */
+
+#include <config.h>
+
+#include "acl.h"
+
+#include "acl-internal.h"
+
+/* 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);
+}
+
+/* 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
+ DEST_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
+copy_acl (const char *src_name, int source_desc, const char *dst_name,
+ int dest_desc, mode_t mode)
+{
+ 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);
+ 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 (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 (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
+ ret = chmod_or_fchmod (dst_name, dest_desc, mode);
+ if (ret != 0)
+ error (0, errno, _("preserving permissions for %s"), quote (dst_name));
+ 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
+set_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)
+ {
+ error (0, errno, "%s", quote (name));
+ 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)
+ {
+ error (0, errno, "%s", quote (name));
+ 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;
+ }
+ error (0, saved_errno, _("setting permissions for %s"), quote (name));
+ return -1;
+ }
+ else
+ acl_free (acl);
+
+ if (S_ISDIR (mode) && acl_delete_def_file (name))
+ {
+ error (0, errno, _("setting permissions for %s"), quote (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))
+ {
+ error (0, errno, _("preserving permissions for %s"), quote (name));
+ return -1;
+ }
+ }
+ return 0;
+#else
+ int ret = chmod_or_fchmod (name, desc, mode);
+ if (ret)
+ error (0, errno, _("setting permissions for %s"), quote (name));
+ return ret;
+#endif
+}
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