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/* Copy POSIX 1003.1e draft 17 (abandoned) ACLs between files. */
/* Copyright (C) 2002 Andreas Gruenbacher <agruen@suse.de>, SuSE Linux AG.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <https://www.gnu.org/licenses/>.
*/
#if defined (HAVE_CONFIG_H)
#include "config.h"
#endif
#if defined(HAVE_LIBACL_LIBACL_H)
# include "libacl.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#if defined(HAVE_SYS_ACL_H)
#include <sys/acl.h>
#endif
#if defined(HAVE_ACL_LIBACL_H)
#include <acl/libacl.h>
#endif
#define ERROR_CONTEXT_MACROS
#ifdef HAVE_ATTR_ERROR_CONTEXT_H
#include <attr/error_context.h>
#else
#include "error_context.h"
#endif
#if !defined(ENOTSUP)
# define ENOTSUP (-1)
#endif
#if !defined(HAVE_ACL_FREE)
static int
acl_free(void *obj_p)
{
free (obj_p);
return 0;
}
#endif
#if !defined(HAVE_ACL_ENTRIES)
static int
acl_entries(acl_t acl)
{
# if defined(HAVE_ACL_GET_ENTRY)
/* POSIX 1003.1e draft 17 (abandoned) compatible version. */
acl_entry_t entry;
int entries = 0;
int entries = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
if (entries > 0) {
while (acl_get_entry(acl, ACL_NEXT_ENTRY, &entry) > 0)
entries++;
}
return entries;
# else
return -1;
# endif
}
#endif
#if !defined(HAVE_ACL_FROM_MODE) && defined(HAVE_ACL_FROM_TEXT)
# define HAVE_ACL_FROM_MODE
static acl_t
acl_from_mode(mode_t mode)
{
char acl_text[] = "u::---,g::---,o::---";
acl_t acl;
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
/* Set the access control list of path to the permissions defined by mode. */
static int
set_acl_fd (char const *path, int fd, mode_t mode, struct error_context *ctx)
{
int ret = 0;
#if defined(HAVE_ACL_FROM_MODE) && defined(HAVE_ACL_SET_FD)
/* POSIX 1003.1e draft 17 (abandoned) specific version. */
acl_t acl = acl_from_mode (mode);
if (!acl) {
error (ctx, "");
return -1;
}
if (acl_set_fd (fd, acl) != 0) {
ret = -1;
if (errno == ENOTSUP || errno == ENOSYS) {
(void) acl_free (acl);
goto chmod_only;
} else {
const char *qpath = quote (ctx, path);
error (ctx, _("setting permissions for %s"), qpath);
quote_free (ctx, qpath);
}
}
(void) acl_free (acl);
return ret;
#endif
chmod_only:
ret = fchmod (fd, mode);
if (ret != 0) {
const char *qpath = quote (ctx, path);
error (ctx, _("setting permissions for %s"), qpath);
quote_free (ctx, qpath);
}
return ret;
}
/* Copy the permissions of src_path to dst_path. This includes the
file mode permission bits and ACLs. File ownership is not copied.
*/
int
perm_copy_fd (const char *src_path, int src_fd,
const char *dst_path, int dst_fd,
struct error_context *ctx)
{
#if defined(HAVE_ACL_GET_FD) && defined(HAVE_ACL_SET_FD)
acl_t acl;
#endif
struct stat st;
int ret = 0;
ret = fstat(src_fd, &st);
if (ret != 0) {
const char *qpath = quote (ctx, src_path);
error (ctx, "%s", qpath);
quote_free (ctx, qpath);
return -1;
}
#if defined(HAVE_ACL_GET_FD) && defined(HAVE_ACL_SET_FD)
/* POSIX 1003.1e draft 17 (abandoned) specific version. */
acl = acl_get_fd (src_fd);
if (acl == NULL) {
ret = -1;
if (errno == ENOSYS || errno == ENOTSUP)
ret = set_acl_fd (dst_path, dst_fd, st.st_mode, ctx);
else {
const char *qpath = quote (ctx, src_path);
error (ctx, "%s", qpath);
quote_free (ctx, qpath);
}
return ret;
}
if (acl_set_fd (dst_fd, acl) != 0) {
int saved_errno = errno;
__apply_mask_to_mode(&st.st_mode, acl);
ret = fchmod (dst_fd, st.st_mode);
if ((errno != ENOSYS && errno != ENOTSUP) ||
acl_entries (acl) != 3) {
const char *qpath = quote (ctx, dst_path);
errno = saved_errno;
error (ctx, _("preserving permissions for %s"), qpath);
quote_free (ctx, qpath);
ret = -1;
}
}
(void) acl_free (acl);
return ret;
#else
/* POSIX.1 version. */
ret = fchmod (dst_fd, st.st_mode);
if (ret != 0) {
const char *qpath = quote (ctx, dst_path);
error (ctx, _("setting permissions for %s"), qpath);
quote_free (ctx, qpath);
}
return ret;
#endif
}
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