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666753c3ef
When mounting with smb2 (or smb2.1 or smb3) we need to check to make sure that attempts to query or set extended attributes do not attempt to send the request with the older cifs protocol instead (eventually we also need to add the support in SMB2 to query/set extended attributes but this patch prevents us from using the wrong protocol for extended attribute operations). Signed-off-by: Steve French <smfrench@gmail.com>
426 lines
12 KiB
C
426 lines
12 KiB
C
/*
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* fs/cifs/xattr.c
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*
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* Copyright (c) International Business Machines Corp., 2003, 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#define MAX_EA_VALUE_SIZE 65535
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#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
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#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
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/* BB need to add server (Samba e.g) support for security and trusted prefix */
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int cifs_removexattr(struct dentry *direntry, const char *ea_name)
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{
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int rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path = NULL;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto remove_ea_exit;
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}
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
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cifs_dbg(FYI,
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"illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* BB what if no namespace prefix? */
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/* Should we just pass them to server, except for
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system and perhaps security prefixes? */
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} else {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto remove_ea_exit;
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, NULL, (__u16)0,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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}
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remove_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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int cifs_setxattr(struct dentry *direntry, const char *ea_name,
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const void *ea_value, size_t value_size, int flags)
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{
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int rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto set_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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/* if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (value_size > MAX_EA_VALUE_SIZE) {
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cifs_dbg(FYI, "size of EA value too large\n");
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rc = -EOPNOTSUPP;
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goto set_ea_exit;
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}
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto set_ea_exit;
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if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
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cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, ea_value, (__u16)value_size,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto set_ea_exit;
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ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, ea_value, (__u16)value_size,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
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strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
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#ifdef CONFIG_CIFS_ACL
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struct cifs_ntsd *pacl;
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pacl = kmalloc(value_size, GFP_KERNEL);
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if (!pacl) {
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rc = -ENOMEM;
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} else {
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memcpy(pacl, ea_value, value_size);
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rc = set_cifs_acl(pacl, value_size,
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direntry->d_inode, full_path, CIFS_ACL_DACL);
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if (rc == 0) /* force revalidate of the inode */
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CIFS_I(direntry->d_inode)->time = 0;
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kfree(pacl);
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}
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#else
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cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
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#endif /* CONFIG_CIFS_ACL */
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} else {
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int temp;
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temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
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strlen(POSIX_ACL_XATTR_ACCESS));
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if (temp == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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ea_value, (const int)value_size,
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ACL_TYPE_ACCESS, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
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#else
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cifs_dbg(FYI, "set POSIX ACL not supported\n");
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#endif
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
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strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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ea_value, (const int)value_size,
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ACL_TYPE_DEFAULT, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
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#else
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cifs_dbg(FYI, "set default POSIX ACL not supported\n");
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#endif
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} else {
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cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* BB what if no namespace prefix? */
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/* Should we just pass them to server, except for
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system and perhaps security prefixes? */
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}
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}
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set_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
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void *ea_value, size_t buf_size)
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{
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ssize_t rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto get_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto get_ea_exit;
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if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
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cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
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/* revalidate/getattr then populate from inode */
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} /* BB add else when above is implemented */
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, ea_name, ea_value, buf_size,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto get_ea_exit;
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ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, ea_name, ea_value, buf_size,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
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strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
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ea_value, buf_size, ACL_TYPE_ACCESS,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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#else
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cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
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#endif /* CONFIG_CIFS_POSIX */
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
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strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
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ea_value, buf_size, ACL_TYPE_DEFAULT,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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#else
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cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
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#endif /* CONFIG_CIFS_POSIX */
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} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
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strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
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#ifdef CONFIG_CIFS_ACL
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u32 acllen;
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struct cifs_ntsd *pacl;
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pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
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full_path, &acllen);
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if (IS_ERR(pacl)) {
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rc = PTR_ERR(pacl);
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cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
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__func__, rc);
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} else {
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if (ea_value) {
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if (acllen > buf_size)
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acllen = -ERANGE;
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else
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memcpy(ea_value, pacl, acllen);
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}
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rc = acllen;
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kfree(pacl);
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}
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#else
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cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
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#endif /* CONFIG_CIFS_ACL */
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} else if (strncmp(ea_name,
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XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
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cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
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} else if (strncmp(ea_name,
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XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
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cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
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} else
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cifs_dbg(FYI,
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"illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* We could add an additional check for streams ie
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if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (rc == -EINVAL)
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rc = -EOPNOTSUPP;
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get_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
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{
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ssize_t rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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return -EOPNOTSUPP;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto list_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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/* if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, NULL, data, buf_size,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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list_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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