diff options
Diffstat (limited to 'gl')
| -rw-r--r-- | gl/lib/acl.c | 426 |
1 files changed, 0 insertions, 426 deletions
diff --git a/gl/lib/acl.c b/gl/lib/acl.c deleted file mode 100644 index 96153d41c..000000000 --- a/gl/lib/acl.c +++ /dev/null @@ -1,426 +0,0 @@ -/* 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 <stdbool.h> -#include <stdlib.h> -#include <string.h> -#ifndef S_ISLNK -# define S_ISLNK(Mode) 0 -#endif - -#ifdef HAVE_ACL_LIBACL_H -# include <acl/libacl.h> -#endif - -#include "error.h" -#include "quote.h" - -#include <errno.h> -#ifndef ENOSYS -# define ENOSYS (-1) -#endif -#ifndef ENOTSUP -# define ENOTSUP (-1) -#endif - -#if ENABLE_NLS -# include <libintl.h> -# define _(Text) gettext (Text) -#else -# define _(Text) Text -#endif - -#ifndef HAVE_FCHMOD -# define HAVE_FCHMOD false -# define fchmod(fd, mode) (-1) -#endif - -/* POSIX 1003.1e (draft 17) */ -#ifndef HAVE_ACL_GET_FD -# define HAVE_ACL_GET_FD false -# define acl_get_fd(fd) (NULL) -#endif - -/* POSIX 1003.1e (draft 17) */ -#ifndef HAVE_ACL_SET_FD -# define HAVE_ACL_SET_FD false -# define acl_set_fd(fd, acl) (-1) -#endif - -/* Linux-specific */ -#ifndef HAVE_ACL_EXTENDED_FILE -# define HAVE_ACL_EXTENDED_FILE false -# define acl_extended_file(name) (-1) -#endif - -/* Linux-specific */ -#ifndef HAVE_ACL_FROM_MODE -# define HAVE_ACL_FROM_MODE false -# define acl_from_mode(mode) (NULL) -#endif - -#define ACL_NOT_WELL_SUPPORTED(Errno) \ - (Errno == ENOTSUP || Errno == ENOSYS || Errno == EINVAL) - -/* We detect the presence of POSIX 1003.1e (draft 17 -- abandoned) support - by checking for HAVE_ACL_GET_FILE, HAVE_ACL_SET_FILE, and HAVE_ACL_FREE. - Systems that have acl_get_file, acl_set_file, and acl_free must also - have acl_to_text, acl_from_text, and acl_delete_def_file (all defined - in the draft); systems that don't would hit #error statements here. */ - -#if USE_ACL && HAVE_ACL_GET_FILE && !HAVE_ACL_ENTRIES -# ifndef HAVE_ACL_TO_TEXT -# error Must have acl_to_text (see POSIX 1003.1e draft 17). -# endif - -/* Return the number of entries in ACL. Linux implements acl_entries - as a more efficient extension than using this workaround. */ - -static int -acl_entries (acl_t acl) -{ - char *text = acl_to_text (acl, NULL), *t; - int entries; - if (text == NULL) - return -1; - for (entries = 0, t = text; ; t++, entries++) { - t = strchr (t, '\n'); - if (t == NULL) - break; - } - acl_free (text); - return entries; -} -#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); -} - -#if USE_ACL && HAVE_ACL_GET_FILE && HAVE_ACL_SET_FILE && HAVE_ACL_FREE -/* FIXME: use acl_trivial instead, once we have a replacement function */ -static bool -is_trivial_acl (acl_t acl) -{ - int n = acl_entries (acl); - if (n <= 3) - return true; - if (5 <= n) - return false; - - /* Here, we know there are exactly 4 entries. - If they are for user, group, mask, and other, then return true; */ - /* FIXME */ - return false; -} -#endif - -/* Return 1 if NAME has a nontrivial access control list, 0 if - NAME only has no or a base access control list, and -1 on - error. SB must be set to the stat buffer of FILE. */ - -int -file_has_acl (char const *name, struct stat const *sb) -{ -#if USE_ACL && HAVE_ACL && defined GETACLCNT - /* This implementation should work on recent-enough versions of HP-UX, - Solaris, and Unixware. */ - -# ifndef MIN_ACL_ENTRIES -# define MIN_ACL_ENTRIES 4 -# endif - - if (! S_ISLNK (sb->st_mode)) - { - int n = acl (name, GETACLCNT, 0, NULL); - return n < 0 ? (errno == ENOSYS ? 0 : -1) : (MIN_ACL_ENTRIES < n); - } -#elif USE_ACL && HAVE_ACL_GET_FILE && HAVE_ACL_FREE - /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */ - - if (! S_ISLNK (sb->st_mode)) - { - int ret; - - if (HAVE_ACL_EXTENDED_FILE) - ret = acl_extended_file (name); - else - { - acl_t acl = acl_get_file (name, ACL_TYPE_ACCESS); - if (acl) - { - ret = !is_trivial_acl (acl); - acl_free (acl); - if (ret == 0 && S_ISDIR (sb->st_mode)) - { - acl = acl_get_file (name, ACL_TYPE_DEFAULT); - if (acl) - { - ret = (0 < acl_entries (acl)); - acl_free (acl); - } - else - ret = -1; - } - } - else - ret = -1; - } - if (ret < 0) - return ACL_NOT_WELL_SUPPORTED (errno) ? 0 : -1; - return ret; - } -#endif - - /* FIXME: Add support for AIX, Irix, and Tru64. Please see Samba's - source/lib/sysacls.c file for fix-related ideas. */ - - return 0; -} - -/* 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)) - { - bool trivial = is_trivial_acl (acl); - acl_free (acl); - if (trivial) - { - 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 -} |