496 строки
13 KiB
C
496 строки
13 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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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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*/
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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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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#include "cifs_ioctl.h"
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#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
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#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
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#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
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#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
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#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
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#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
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/*
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* Although these three are just aliases for the above, need to move away from
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* confusing users and using the 20+ year old term 'cifs' when it is no longer
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* secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
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*/
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#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
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#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
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#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
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#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
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#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
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/* BB need to add server (Samba e.g) support for security and trusted prefix */
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enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
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XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
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static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
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struct inode *inode, const char *full_path,
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const void *value, size_t size)
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{
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ssize_t rc = -EOPNOTSUPP;
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__u32 *pattrib = (__u32 *)value;
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__u32 attrib;
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FILE_BASIC_INFO info_buf;
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if ((value == NULL) || (size != sizeof(__u32)))
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return -ERANGE;
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memset(&info_buf, 0, sizeof(info_buf));
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attrib = *pattrib;
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info_buf.Attributes = cpu_to_le32(attrib);
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if (pTcon->ses->server->ops->set_file_info)
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rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
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&info_buf, xid);
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if (rc == 0)
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CIFS_I(inode)->cifsAttrs = attrib;
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return rc;
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}
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static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
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struct inode *inode, const char *full_path,
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const void *value, size_t size)
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{
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ssize_t rc = -EOPNOTSUPP;
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__u64 *pcreation_time = (__u64 *)value;
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__u64 creation_time;
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FILE_BASIC_INFO info_buf;
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if ((value == NULL) || (size != sizeof(__u64)))
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return -ERANGE;
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memset(&info_buf, 0, sizeof(info_buf));
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creation_time = *pcreation_time;
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info_buf.CreationTime = cpu_to_le64(creation_time);
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if (pTcon->ses->server->ops->set_file_info)
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rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
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&info_buf, xid);
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if (rc == 0)
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CIFS_I(inode)->createtime = creation_time;
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return rc;
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}
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static int cifs_xattr_set(const struct xattr_handler *handler,
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struct user_namespace *mnt_userns,
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struct dentry *dentry, struct inode *inode,
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const char *name, const void *value,
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size_t size, int flags)
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{
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int rc = -EOPNOTSUPP;
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unsigned int xid;
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struct super_block *sb = dentry->d_sb;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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const char *full_path;
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void *page;
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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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page = alloc_dentry_path();
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full_path = build_path_from_dentry(dentry, page);
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if (IS_ERR(full_path)) {
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rc = PTR_ERR(full_path);
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goto out;
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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 (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 out;
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}
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switch (handler->flags) {
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case XATTR_USER:
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cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
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if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
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(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
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rc = cifs_attrib_set(xid, pTcon, inode, full_path,
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value, size);
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if (rc == 0) /* force revalidate of the inode */
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CIFS_I(inode)->time = 0;
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break;
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} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
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(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
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rc = cifs_creation_time_set(xid, pTcon, inode,
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full_path, value, size);
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if (rc == 0) /* force revalidate of the inode */
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CIFS_I(inode)->time = 0;
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break;
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}
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto out;
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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, name, value, (__u16)size,
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cifs_sb->local_nls, cifs_sb);
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break;
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case XATTR_CIFS_ACL:
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case XATTR_CIFS_NTSD:
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case XATTR_CIFS_NTSD_FULL: {
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struct cifs_ntsd *pacl;
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if (!value)
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goto out;
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pacl = kmalloc(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, value, size);
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if (pTcon->ses->server->ops->set_acl) {
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int aclflags = 0;
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rc = 0;
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switch (handler->flags) {
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case XATTR_CIFS_NTSD_FULL:
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aclflags = (CIFS_ACL_OWNER |
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CIFS_ACL_GROUP |
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CIFS_ACL_DACL |
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CIFS_ACL_SACL);
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break;
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case XATTR_CIFS_NTSD:
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aclflags = (CIFS_ACL_OWNER |
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CIFS_ACL_GROUP |
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CIFS_ACL_DACL);
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break;
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case XATTR_CIFS_ACL:
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default:
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aclflags = CIFS_ACL_DACL;
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}
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rc = pTcon->ses->server->ops->set_acl(pacl,
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size, inode, full_path, aclflags);
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} else {
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rc = -EOPNOTSUPP;
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}
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if (rc == 0) /* force revalidate of the inode */
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CIFS_I(inode)->time = 0;
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kfree(pacl);
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}
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break;
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}
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}
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out:
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free_dentry_path(page);
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free_xid(xid);
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cifs_put_tlink(tlink);
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return rc;
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}
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static int cifs_attrib_get(struct dentry *dentry,
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struct inode *inode, void *value,
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size_t size)
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{
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ssize_t rc;
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__u32 *pattribute;
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rc = cifs_revalidate_dentry_attr(dentry);
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if (rc)
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return rc;
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if ((value == NULL) || (size == 0))
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return sizeof(__u32);
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else if (size < sizeof(__u32))
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return -ERANGE;
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/* return dos attributes as pseudo xattr */
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pattribute = (__u32 *)value;
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*pattribute = CIFS_I(inode)->cifsAttrs;
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return sizeof(__u32);
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}
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static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
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void *value, size_t size)
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{
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ssize_t rc;
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__u64 *pcreatetime;
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rc = cifs_revalidate_dentry_attr(dentry);
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if (rc)
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return rc;
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if ((value == NULL) || (size == 0))
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return sizeof(__u64);
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else if (size < sizeof(__u64))
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return -ERANGE;
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/* return dos attributes as pseudo xattr */
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pcreatetime = (__u64 *)value;
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*pcreatetime = CIFS_I(inode)->createtime;
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return sizeof(__u64);
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}
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static int cifs_xattr_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, void *value, size_t size)
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{
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ssize_t rc = -EOPNOTSUPP;
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unsigned int xid;
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struct super_block *sb = dentry->d_sb;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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const char *full_path;
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void *page;
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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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page = alloc_dentry_path();
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full_path = build_path_from_dentry(dentry, page);
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if (IS_ERR(full_path)) {
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rc = PTR_ERR(full_path);
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goto out;
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}
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/* return alt name if available as pseudo attr */
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switch (handler->flags) {
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case XATTR_USER:
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cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
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if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
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(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
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rc = cifs_attrib_get(dentry, inode, value, size);
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break;
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} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
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(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
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rc = cifs_creation_time_get(dentry, inode, value, size);
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break;
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}
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto out;
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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, name, value, size, cifs_sb);
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break;
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case XATTR_CIFS_ACL:
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case XATTR_CIFS_NTSD:
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case XATTR_CIFS_NTSD_FULL: {
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/*
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* fetch owner, DACL, and SACL if asked for full descriptor,
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* fetch owner and DACL otherwise
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*/
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u32 acllen, extra_info;
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struct cifs_ntsd *pacl;
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if (pTcon->ses->server->ops->get_acl == NULL)
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goto out; /* rc already EOPNOTSUPP */
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if (handler->flags == XATTR_CIFS_NTSD_FULL) {
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extra_info = SACL_SECINFO;
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} else {
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extra_info = 0;
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}
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pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
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inode, full_path, &acllen, extra_info);
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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 (value) {
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if (acllen > size)
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acllen = -ERANGE;
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else
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memcpy(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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break;
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}
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}
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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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out:
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free_dentry_path(page);
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free_xid(xid);
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cifs_put_tlink(tlink);
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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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unsigned int xid;
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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const char *full_path;
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void *page;
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if (unlikely(cifs_forced_shutdown(cifs_sb)))
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return -EIO;
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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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page = alloc_dentry_path();
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full_path = build_path_from_dentry(direntry, page);
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if (IS_ERR(full_path)) {
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rc = PTR_ERR(full_path);
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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, cifs_sb);
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list_ea_exit:
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free_dentry_path(page);
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free_xid(xid);
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cifs_put_tlink(tlink);
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return rc;
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}
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static const struct xattr_handler cifs_user_xattr_handler = {
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.prefix = XATTR_USER_PREFIX,
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.flags = XATTR_USER,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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/* os2.* attributes are treated like user.* attributes */
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static const struct xattr_handler cifs_os2_xattr_handler = {
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.prefix = XATTR_OS2_PREFIX,
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.flags = XATTR_USER,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
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.name = CIFS_XATTR_CIFS_ACL,
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.flags = XATTR_CIFS_ACL,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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/*
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* Although this is just an alias for the above, need to move away from
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* confusing users and using the 20 year old term 'cifs' when it is no
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* longer secure and was replaced by SMB2/SMB3 a long time ago, and
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* SMB3 and later are highly secure.
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*/
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static const struct xattr_handler smb3_acl_xattr_handler = {
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.name = SMB3_XATTR_CIFS_ACL,
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.flags = XATTR_CIFS_ACL,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
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.name = CIFS_XATTR_CIFS_NTSD,
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.flags = XATTR_CIFS_NTSD,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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/*
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* Although this is just an alias for the above, need to move away from
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* confusing users and using the 20 year old term 'cifs' when it is no
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* longer secure and was replaced by SMB2/SMB3 a long time ago, and
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* SMB3 and later are highly secure.
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*/
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static const struct xattr_handler smb3_ntsd_xattr_handler = {
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.name = SMB3_XATTR_CIFS_NTSD,
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.flags = XATTR_CIFS_NTSD,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
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.name = CIFS_XATTR_CIFS_NTSD_FULL,
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.flags = XATTR_CIFS_NTSD_FULL,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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/*
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* Although this is just an alias for the above, need to move away from
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|
* confusing users and using the 20 year old term 'cifs' when it is no
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* longer secure and was replaced by SMB2/SMB3 a long time ago, and
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* SMB3 and later are highly secure.
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*/
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static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
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.name = SMB3_XATTR_CIFS_NTSD_FULL,
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.flags = XATTR_CIFS_NTSD_FULL,
|
|
.get = cifs_xattr_get,
|
|
.set = cifs_xattr_set,
|
|
};
|
|
|
|
const struct xattr_handler *cifs_xattr_handlers[] = {
|
|
&cifs_user_xattr_handler,
|
|
&cifs_os2_xattr_handler,
|
|
&cifs_cifs_acl_xattr_handler,
|
|
&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
|
|
&cifs_cifs_ntsd_xattr_handler,
|
|
&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
|
|
&cifs_cifs_ntsd_full_xattr_handler,
|
|
&smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
|
&posix_acl_access_xattr_handler,
|
|
&posix_acl_default_xattr_handler,
|
|
#endif
|
|
NULL
|
|
};
|