[mirror_ubuntu-jammy-kernel.git] / fs / cifs / xattr.c

// SPDX-License-Identifier: LGPL-2.1
/*
 *
 *   Copyright (c) International Business Machines  Corp., 2003, 2007
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 */

#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "cifs_ioctl.h"

#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
#define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */
#define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */
/*
 * Although these three are just aliases for the above, need to move away from
 * confusing users and using the 20+ year old term 'cifs' when it is no longer
 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
 */
#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
#define SMB3_XATTR_ATTRIB "smb3.dosattrib"  /* full name: user.smb3.dosattrib */
#define SMB3_XATTR_CREATETIME "smb3.creationtime"  /* user.smb3.creationtime */
/* BB need to add server (Samba e.g) support for security and trusted prefix */

enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
	XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };

static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
			   struct inode *inode, const char *full_path,
			   const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u32 *pattrib = (__u32 *)value;
	__u32 attrib;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u32)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	attrib = *pattrib;
	info_buf.Attributes = cpu_to_le32(attrib);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->cifsAttrs = attrib;

	return rc;
}

static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
				  struct inode *inode, const char *full_path,
				  const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u64 *pcreation_time = (__u64 *)value;
	__u64 creation_time;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u64)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	creation_time = *pcreation_time;
	info_buf.CreationTime = cpu_to_le64(creation_time);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->createtime = creation_time;

	return rc;
}

static int cifs_xattr_set(const struct xattr_handler *handler,
			  struct user_namespace *mnt_userns,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, const void *value,
			  size_t size, int flags)
{
	int rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	const char *full_path;
	void *page;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(dentry, page);
	if (IS_ERR(full_path)) {
		rc = PTR_ERR(full_path);
		goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */
	if (size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto out;
	}

	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
		if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_set(xid, pTcon, inode, full_path,
					value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
			   (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
			rc = cifs_creation_time_set(xid, pTcon, inode,
					full_path, value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, name, value, (__u16)size,
				cifs_sb->local_nls, cifs_sb);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD:
	case XATTR_CIFS_NTSD_FULL: {
		struct cifs_ntsd *pacl;

		if (!value)
			goto out;
		pacl = kmalloc(size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, value, size);
			if (pTcon->ses->server->ops->set_acl) {
				int aclflags = 0;
				rc = 0;

				switch (handler->flags) {
				case XATTR_CIFS_NTSD_FULL:
					aclflags = (CIFS_ACL_OWNER |
						    CIFS_ACL_DACL |
						    CIFS_ACL_SACL);
					break;
				case XATTR_CIFS_NTSD:
					aclflags = (CIFS_ACL_OWNER |
						    CIFS_ACL_DACL);
					break;
				case XATTR_CIFS_ACL:
				default:
					aclflags = CIFS_ACL_DACL;
				}

				rc = pTcon->ses->server->ops->set_acl(pacl,
					size, inode, full_path, aclflags);
			} else {
				rc = -EOPNOTSUPP;
			}
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			kfree(pacl);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_ACCESS, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_DEFAULT, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

out:
	free_dentry_path(page);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static int cifs_attrib_get(struct dentry *dentry,
			   struct inode *inode, void *value,
			   size_t size)
{
	ssize_t rc;
	__u32 *pattribute;

	rc = cifs_revalidate_dentry_attr(dentry);

	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u32);
	else if (size < sizeof(__u32))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pattribute = (__u32 *)value;
	*pattribute = CIFS_I(inode)->cifsAttrs;

	return sizeof(__u32);
}

static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
				  void *value, size_t size)
{
	ssize_t rc;
	__u64 *pcreatetime;

	rc = cifs_revalidate_dentry_attr(dentry);
	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u64);
	else if (size < sizeof(__u64))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pcreatetime = (__u64 *)value;
	*pcreatetime = CIFS_I(inode)->createtime;
	return sizeof(__u64);
}


static int cifs_xattr_get(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	const char *full_path;
	void *page;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(dentry, page);
	if (IS_ERR(full_path)) {
		rc = PTR_ERR(full_path);
		goto out;
	}

	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
		if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
		    (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
			rc = cifs_creation_time_get(dentry, inode, value, size);
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, name, value, size, cifs_sb);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD:
	case XATTR_CIFS_NTSD_FULL: {
		/*
		 * fetch owner, DACL, and SACL if asked for full descriptor,
		 * fetch owner and DACL otherwise
		 */
		u32 acllen, extra_info;
		struct cifs_ntsd *pacl;

		if (pTcon->ses->server->ops->get_acl == NULL)
			goto out; /* rc already EOPNOTSUPP */

		if (handler->flags == XATTR_CIFS_NTSD_FULL) {
			extra_info = SACL_SECINFO;
		} else {
			extra_info = 0;
		}
		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen, extra_info);
		if (IS_ERR(pacl)) {
			rc = PTR_ERR(pacl);
			cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
				 __func__, rc);
		} else {
			if (value) {
				if (acllen > size)
					acllen = -ERANGE;
				else
					memcpy(value, pacl, acllen);
			}
			rc = acllen;
			kfree(pacl);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

	/* We could add an additional check for streams ie
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (rc == -EINVAL)
		rc = -EOPNOTSUPP;

out:
	free_dentry_path(page);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	const char *full_path;
	void *page;

	if (unlikely(cifs_forced_shutdown(cifs_sb)))
		return -EIO;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		return -EOPNOTSUPP;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(direntry, page);
	if (IS_ERR(full_path)) {
		rc = PTR_ERR(full_path);
		goto list_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (pTcon->ses->server->ops->query_all_EAs)
		rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, NULL, data, buf_size, cifs_sb);
list_ea_exit:
	free_dentry_path(page);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static const struct xattr_handler cifs_user_xattr_handler = {
	.prefix = XATTR_USER_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/* os2.* attributes are treated like user.* attributes */
static const struct xattr_handler cifs_os2_xattr_handler = {
	.prefix = XATTR_OS2_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	.name = CIFS_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_acl_xattr_handler = {
	.name = SMB3_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	.name = CIFS_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_ntsd_xattr_handler = {
	.name = SMB3_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
	.name = CIFS_XATTR_CIFS_NTSD_FULL,
	.flags = XATTR_CIFS_NTSD_FULL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
	.name = SMB3_XATTR_CIFS_NTSD_FULL,
	.flags = XATTR_CIFS_NTSD_FULL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};


static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	.flags = XATTR_ACL_ACCESS,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	.flags = XATTR_ACL_DEFAULT,
	.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" */
	&cifs_posix_acl_access_xattr_handler,
	&cifs_posix_acl_default_xattr_handler,
	NULL
};
Commit	Line	Data
929be906	1	// SPDX-License-Identifier: LGPL-2.1
1da177e4	2	/*
1da177e4	3	*
79a58d1f	4	* Copyright (c) International Business Machines Corp., 2003, 2007
1da177e4 LT	5	* Author(s): Steve French (sfrench@us.ibm.com)
1da177e4 LT	6	*
1da177e4 LT	7	*/
	8
	9	#include <linux/fs.h>
	10	#include <linux/posix_acl_xattr.h>
5a0e3ad6	11	#include <linux/slab.h>
f995e740	12	#include <linux/xattr.h>
1da177e4 LT	13	#include "cifsfs.h"
	14	#include "cifspdu.h"
	15	#include "cifsglob.h"
	16	#include "cifsproto.h"
	17	#include "cifs_debug.h"
2baa2682 SF	18	#include "cifs_fs_sb.h"
2baa2682 SF	19	#include "cifs_unicode.h"
087f757b	20	#include "cifs_ioctl.h"
1da177e4	21
63d37fb4	22	#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
438471b6 BP	23	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
438471b6 BP	24	#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
3970acf7	25	#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
a958fff2	26	#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044	27	#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
c4f7173a SF	28	/*
	29	* Although these three are just aliases for the above, need to move away from
	30	* confusing users and using the 20+ year old term 'cifs' when it is no longer
	31	* secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
	32	*/
438471b6 BP	33	#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
438471b6 BP	34	#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
3970acf7	35	#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
c4f7173a SF	36	#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
c4f7173a SF	37	#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
f995e740	38	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	39
438471b6	40	enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
3970acf7	41	XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
438471b6 BP	42
438471b6 BP	43	static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
f6f1f179	44	struct inode inode, const char full_path,
438471b6 BP	45	const void *value, size_t size)
	46	{
	47	ssize_t rc = -EOPNOTSUPP;
	48	__u32 pattrib = (__u32 )value;
	49	__u32 attrib;
	50	FILE_BASIC_INFO info_buf;
	51
	52	if ((value == NULL) \|\| (size != sizeof(__u32)))
	53	return -ERANGE;
	54
	55	memset(&info_buf, 0, sizeof(info_buf));
	56	attrib = *pattrib;
	57	info_buf.Attributes = cpu_to_le32(attrib);
	58	if (pTcon->ses->server->ops->set_file_info)
	59	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	60	&info_buf, xid);
	61	if (rc == 0)
	62	CIFS_I(inode)->cifsAttrs = attrib;
	63
	64	return rc;
	65	}
	66
	67	static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
f6f1f179	68	struct inode inode, const char full_path,
438471b6 BP	69	const void *value, size_t size)
	70	{
	71	ssize_t rc = -EOPNOTSUPP;
	72	__u64 pcreation_time = (__u64 )value;
	73	__u64 creation_time;
	74	FILE_BASIC_INFO info_buf;
	75
	76	if ((value == NULL) \|\| (size != sizeof(__u64)))
	77	return -ERANGE;
	78
	79	memset(&info_buf, 0, sizeof(info_buf));
	80	creation_time = *pcreation_time;
	81	info_buf.CreationTime = cpu_to_le64(creation_time);
	82	if (pTcon->ses->server->ops->set_file_info)
	83	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	84	&info_buf, xid);
	85	if (rc == 0)
	86	CIFS_I(inode)->createtime = creation_time;
	87
	88	return rc;
	89	}
7ffec372	90
a9ae008f	91	static int cifs_xattr_set(const struct xattr_handler *handler,
e65ce2a5	92	struct user_namespace *mnt_userns,
59301226 AV	93	struct dentry dentry, struct inode inode,
	94	const char name, const void value,
	95	size_t size, int flags)
1da177e4 LT	96	{
1da177e4 LT	97	int rc = -EOPNOTSUPP;
6d5786a3	98	unsigned int xid;
a9ae008f	99	struct super_block *sb = dentry->d_sb;
5fdccfef	100	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	101	struct tcon_link *tlink;
96daf2b0	102	struct cifs_tcon *pTcon;
8e33cf20	103	const char *full_path;
f6a9bc33	104	void *page;
1da177e4	105
7ffec372 JL	106	tlink = cifs_sb_tlink(cifs_sb);
	107	if (IS_ERR(tlink))
	108	return PTR_ERR(tlink);
	109	pTcon = tlink_tcon(tlink);
	110
6d5786a3	111	xid = get_xid();
f6a9bc33	112	page = alloc_dentry_path();
1da177e4	113
f6a9bc33 AV	114	full_path = build_path_from_dentry(dentry, page);
	115	if (IS_ERR(full_path)) {
	116	rc = PTR_ERR(full_path);
a9ae008f	117	goto out;
1da177e4 LT	118	}
	119	/* return dos attributes as pseudo xattr */
	120	/* return alt name if available as pseudo attr */
	121
	122	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	123	search server for EAs or streams to
1da177e4	124	returns as xattrs */
a9ae008f	125	if (size > MAX_EA_VALUE_SIZE) {
f96637be	126	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372	127	rc = -EOPNOTSUPP;
a9ae008f	128	goto out;
1da177e4 LT	129	}
1da177e4 LT	130
a9ae008f AG	131	switch (handler->flags) {
a9ae008f AG	132	case XATTR_USER:
438471b6 BP	133	cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
	134	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
	135	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
	136	rc = cifs_attrib_set(xid, pTcon, inode, full_path,
	137	value, size);
	138	if (rc == 0) /* force revalidate of the inode */
	139	CIFS_I(inode)->time = 0;
	140	break;
	141	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
	142	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
	143	rc = cifs_creation_time_set(xid, pTcon, inode,
	144	full_path, value, size);
	145	if (rc == 0) /* force revalidate of the inode */
	146	CIFS_I(inode)->time = 0;
	147	break;
	148	}
	149
79a58d1f	150	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	151	goto out;
ad7a2926	152
666753c3 SF	153	if (pTcon->ses->server->ops->set_EA)
666753c3 SF	154	rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f	155	full_path, name, value, (__u16)size,
5517554e	156	cifs_sb->local_nls, cifs_sb);
a9ae008f	157	break;
1da177e4	158
438471b6	159	case XATTR_CIFS_ACL:
3970acf7 BP	160	case XATTR_CIFS_NTSD:
3970acf7 BP	161	case XATTR_CIFS_NTSD_FULL: {
b0f8ef20	162	struct cifs_ntsd *pacl;
a9ae008f AG	163
	164	if (!value)
	165	goto out;
	166	pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b	167	if (!pacl) {
b73b9a4b SF	168	rc = -ENOMEM;
b73b9a4b SF	169	} else {
a9ae008f	170	memcpy(pacl, value, size);
3970acf7 BP	171	if (pTcon->ses->server->ops->set_acl) {
3970acf7 BP	172	int aclflags = 0;
438471b6	173	rc = 0;
3970acf7 BP	174
	175	switch (handler->flags) {
	176	case XATTR_CIFS_NTSD_FULL:
	177	aclflags = (CIFS_ACL_OWNER \|
	178	CIFS_ACL_DACL \|
	179	CIFS_ACL_SACL);
	180	break;
	181	case XATTR_CIFS_NTSD:
	182	aclflags = (CIFS_ACL_OWNER \|
	183	CIFS_ACL_DACL);
	184	break;
	185	case XATTR_CIFS_ACL:
	186	default:
	187	aclflags = CIFS_ACL_DACL;
438471b6	188	}
3970acf7 BP	189
	190	rc = pTcon->ses->server->ops->set_acl(pacl,
	191	size, inode, full_path, aclflags);
438471b6	192	} else {
83e3bc23	193	rc = -EOPNOTSUPP;
438471b6	194	}
b73b9a4b	195	if (rc == 0) /* force revalidate of the inode */
59301226	196	CIFS_I(inode)->time = 0;
b73b9a4b	197	kfree(pacl);
b0f8ef20	198	}
a9ae008f AG	199	break;
	200	}
	201
	202	case XATTR_ACL_ACCESS:
1da177e4	203	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	204	if (!value)
a9ae008f AG	205	goto out;
1751e8a6	206	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	207	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	208	value, (const int)size,
	209	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	210	cifs_remap(cifs_sb));
	211	#endif /* CONFIG_CIFS_POSIX */
	212	break;
	213
	214	case XATTR_ACL_DEFAULT:
1da177e4	215	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	216	if (!value)
a9ae008f AG	217	goto out;
1751e8a6	218	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	219	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	220	value, (const int)size,
	221	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	222	cifs_remap(cifs_sb));
	223	#endif /* CONFIG_CIFS_POSIX */
	224	break;
1da177e4 LT	225	}
1da177e4 LT	226
a9ae008f	227	out:
f6a9bc33	228	free_dentry_path(page);
6d5786a3	229	free_xid(xid);
7ffec372	230	cifs_put_tlink(tlink);
1da177e4 LT	231	return rc;
	232	}
	233
a958fff2 SF	234	static int cifs_attrib_get(struct dentry *dentry,
	235	struct inode inode, void value,
	236	size_t size)
	237	{
	238	ssize_t rc;
	239	__u32 *pattribute;
	240
	241	rc = cifs_revalidate_dentry_attr(dentry);
	242
	243	if (rc)
	244	return rc;
	245
	246	if ((value == NULL) \|\| (size == 0))
	247	return sizeof(__u32);
	248	else if (size < sizeof(__u32))
	249	return -ERANGE;
	250
	251	/* return dos attributes as pseudo xattr */
	252	pattribute = (__u32 *)value;
	253	*pattribute = CIFS_I(inode)->cifsAttrs;
	254
	255	return sizeof(__u32);
	256	}
	257
66098044 SF	258	static int cifs_creation_time_get(struct dentry dentry, struct inode inode,
	259	void *value, size_t size)
	260	{
	261	ssize_t rc;
438471b6	262	__u64 *pcreatetime;
66098044 SF	263
	264	rc = cifs_revalidate_dentry_attr(dentry);
	265	if (rc)
	266	return rc;
	267
	268	if ((value == NULL) \|\| (size == 0))
	269	return sizeof(__u64);
	270	else if (size < sizeof(__u64))
	271	return -ERANGE;
	272
	273	/* return dos attributes as pseudo xattr */
	274	pcreatetime = (__u64 *)value;
	275	*pcreatetime = CIFS_I(inode)->createtime;
	276	return sizeof(__u64);
66098044 SF	277	}
66098044 SF	278
a958fff2	279
a9ae008f AG	280	static int cifs_xattr_get(const struct xattr_handler *handler,
	281	struct dentry dentry, struct inode inode,
	282	const char name, void value, size_t size)
1da177e4 LT	283	{
1da177e4 LT	284	ssize_t rc = -EOPNOTSUPP;
6d5786a3	285	unsigned int xid;
a9ae008f	286	struct super_block *sb = dentry->d_sb;
5fdccfef	287	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	288	struct tcon_link *tlink;
96daf2b0	289	struct cifs_tcon *pTcon;
8e33cf20	290	const char *full_path;
f6a9bc33	291	void *page;
1da177e4	292
7ffec372 JL	293	tlink = cifs_sb_tlink(cifs_sb);
	294	if (IS_ERR(tlink))
	295	return PTR_ERR(tlink);
	296	pTcon = tlink_tcon(tlink);
	297
6d5786a3	298	xid = get_xid();
f6a9bc33	299	page = alloc_dentry_path();
1da177e4	300
f6a9bc33 AV	301	full_path = build_path_from_dentry(dentry, page);
	302	if (IS_ERR(full_path)) {
	303	rc = PTR_ERR(full_path);
a9ae008f	304	goto out;
1da177e4	305	}
a958fff2	306
1da177e4	307	/* return alt name if available as pseudo attr */
a9ae008f AG	308	switch (handler->flags) {
a9ae008f AG	309	case XATTR_USER:
a958fff2	310	cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
c4f7173a SF	311	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
c4f7173a SF	312	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
a958fff2 SF	313	rc = cifs_attrib_get(dentry, inode, value, size);
a958fff2 SF	314	break;
c4f7173a SF	315	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
c4f7173a SF	316	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
66098044 SF	317	rc = cifs_creation_time_get(dentry, inode, value, size);
66098044 SF	318	break;
a958fff2 SF	319	}
a958fff2 SF	320
79a58d1f	321	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	322	goto out;
1da177e4	323
666753c3 SF	324	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	325	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	326	full_path, name, value, size, cifs_sb);
a9ae008f	327	break;
1da177e4	328
438471b6	329	case XATTR_CIFS_ACL:
3970acf7 BP	330	case XATTR_CIFS_NTSD:
	331	case XATTR_CIFS_NTSD_FULL: {
	332	/*
	333	* fetch owner, DACL, and SACL if asked for full descriptor,
	334	* fetch owner and DACL otherwise
	335	*/
9541b813	336	u32 acllen, extra_info;
a9ae008f AG	337	struct cifs_ntsd *pacl;
	338
	339	if (pTcon->ses->server->ops->get_acl == NULL)
	340	goto out; /* rc already EOPNOTSUPP */
	341
3970acf7	342	if (handler->flags == XATTR_CIFS_NTSD_FULL) {
9541b813	343	extra_info = SACL_SECINFO;
3970acf7	344	} else {
9541b813	345	extra_info = 0;
3970acf7	346	}
a9ae008f	347	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
9541b813	348	inode, full_path, &acllen, extra_info);
a9ae008f AG	349	if (IS_ERR(pacl)) {
	350	rc = PTR_ERR(pacl);
	351	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
	352	__func__, rc);
	353	} else {
	354	if (value) {
	355	if (acllen > size)
	356	acllen = -ERANGE;
	357	else
	358	memcpy(value, pacl, acllen);
	359	}
	360	rc = acllen;
	361	kfree(pacl);
	362	}
a9ae008f AG	363	break;
	364	}
	365
	366	case XATTR_ACL_ACCESS:
1da177e4	367	#ifdef CONFIG_CIFS_POSIX
1751e8a6	368	if (sb->s_flags & SB_POSIXACL)
1da0c78b	369	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	370	value, size, ACL_TYPE_ACCESS,
737b758c	371	cifs_sb->local_nls,
2baa2682	372	cifs_remap(cifs_sb));
a9ae008f AG	373	#endif /* CONFIG_CIFS_POSIX */
	374	break;
	375
	376	case XATTR_ACL_DEFAULT:
1da177e4	377	#ifdef CONFIG_CIFS_POSIX
1751e8a6	378	if (sb->s_flags & SB_POSIXACL)
1da0c78b	379	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	380	value, size, ACL_TYPE_DEFAULT,
737b758c	381	cifs_sb->local_nls,
2baa2682	382	cifs_remap(cifs_sb));
a9ae008f AG	383	#endif /* CONFIG_CIFS_POSIX */
	384	break;
	385	}
1da177e4	386
79a58d1f	387	/* We could add an additional check for streams ie
1da177e4	388	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	389	search server for EAs or streams to
1da177e4 LT	390	returns as xattrs */
1da177e4 LT	391
79a58d1f SF	392	if (rc == -EINVAL)
79a58d1f SF	393	rc = -EOPNOTSUPP;
1da177e4	394
a9ae008f	395	out:
f6a9bc33	396	free_dentry_path(page);
6d5786a3	397	free_xid(xid);
7ffec372	398	cifs_put_tlink(tlink);
1da177e4 LT	399	return rc;
	400	}
	401
79a58d1f	402	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	403	{
1da177e4 LT	404	ssize_t rc = -EOPNOTSUPP;
6d5786a3	405	unsigned int xid;
5fdccfef	406	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372	407	struct tcon_link *tlink;
96daf2b0	408	struct cifs_tcon *pTcon;
8e33cf20	409	const char *full_path;
f6a9bc33	410	void *page;
1da177e4	411
087f757b SF	412	if (unlikely(cifs_forced_shutdown(cifs_sb)))
	413	return -EIO;
	414
79a58d1f	415	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	416	return -EOPNOTSUPP;
ea4c07d7 SF	417
7ffec372 JL	418	tlink = cifs_sb_tlink(cifs_sb);
	419	if (IS_ERR(tlink))
	420	return PTR_ERR(tlink);
	421	pTcon = tlink_tcon(tlink);
	422
6d5786a3	423	xid = get_xid();
f6a9bc33	424	page = alloc_dentry_path();
ea4c07d7	425
f6a9bc33 AV	426	full_path = build_path_from_dentry(direntry, page);
	427	if (IS_ERR(full_path)) {
	428	rc = PTR_ERR(full_path);
7ffec372	429	goto list_ea_exit;
1da177e4 LT	430	}
	431	/* return dos attributes as pseudo xattr */
	432	/* return alt name if available as pseudo attr */
	433
	434	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	435	search server for EAs or streams to
1da177e4	436	returns as xattrs */
1da177e4	437
666753c3 SF	438	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	439	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	440	full_path, NULL, data, buf_size, cifs_sb);
7ffec372	441	list_ea_exit:
f6a9bc33	442	free_dentry_path(page);
6d5786a3	443	free_xid(xid);
7ffec372	444	cifs_put_tlink(tlink);
1da177e4 LT	445	return rc;
1da177e4 LT	446	}
a9ae008f AG	447
	448	static const struct xattr_handler cifs_user_xattr_handler = {
	449	.prefix = XATTR_USER_PREFIX,
	450	.flags = XATTR_USER,
	451	.get = cifs_xattr_get,
	452	.set = cifs_xattr_set,
	453	};
	454
	455	/* os2.* attributes are treated like user.* attributes */
	456	static const struct xattr_handler cifs_os2_xattr_handler = {
	457	.prefix = XATTR_OS2_PREFIX,
	458	.flags = XATTR_USER,
	459	.get = cifs_xattr_get,
	460	.set = cifs_xattr_set,
	461	};
	462
	463	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	464	.name = CIFS_XATTR_CIFS_ACL,
	465	.flags = XATTR_CIFS_ACL,
	466	.get = cifs_xattr_get,
	467	.set = cifs_xattr_set,
	468	};
	469
c4f7173a SF	470	/*
	471	* Although this is just an alias for the above, need to move away from
	472	* confusing users and using the 20 year old term 'cifs' when it is no
	473	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	474	* SMB3 and later are highly secure.
	475	*/
	476	static const struct xattr_handler smb3_acl_xattr_handler = {
	477	.name = SMB3_XATTR_CIFS_ACL,
	478	.flags = XATTR_CIFS_ACL,
	479	.get = cifs_xattr_get,
	480	.set = cifs_xattr_set,
	481	};
	482
438471b6 BP	483	static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	484	.name = CIFS_XATTR_CIFS_NTSD,
	485	.flags = XATTR_CIFS_NTSD,
	486	.get = cifs_xattr_get,
	487	.set = cifs_xattr_set,
	488	};
	489
	490	/*
	491	* Although this is just an alias for the above, need to move away from
	492	* confusing users and using the 20 year old term 'cifs' when it is no
	493	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	494	* SMB3 and later are highly secure.
	495	*/
	496	static const struct xattr_handler smb3_ntsd_xattr_handler = {
	497	.name = SMB3_XATTR_CIFS_NTSD,
	498	.flags = XATTR_CIFS_NTSD,
	499	.get = cifs_xattr_get,
	500	.set = cifs_xattr_set,
	501	};
	502
3970acf7 BP	503	static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
	504	.name = CIFS_XATTR_CIFS_NTSD_FULL,
	505	.flags = XATTR_CIFS_NTSD_FULL,
	506	.get = cifs_xattr_get,
	507	.set = cifs_xattr_set,
	508	};
	509
	510	/*
	511	* Although this is just an alias for the above, need to move away from
	512	* confusing users and using the 20 year old term 'cifs' when it is no
	513	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	514	* SMB3 and later are highly secure.
	515	*/
	516	static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
	517	.name = SMB3_XATTR_CIFS_NTSD_FULL,
	518	.flags = XATTR_CIFS_NTSD_FULL,
	519	.get = cifs_xattr_get,
	520	.set = cifs_xattr_set,
	521	};
	522
	523
a9ae008f AG	524	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	525	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	526	.flags = XATTR_ACL_ACCESS,
	527	.get = cifs_xattr_get,
	528	.set = cifs_xattr_set,
	529	};
	530
	531	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	532	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	533	.flags = XATTR_ACL_DEFAULT,
	534	.get = cifs_xattr_get,
	535	.set = cifs_xattr_set,
	536	};
	537
	538	const struct xattr_handler *cifs_xattr_handlers[] = {
	539	&cifs_user_xattr_handler,
	540	&cifs_os2_xattr_handler,
	541	&cifs_cifs_acl_xattr_handler,
c4f7173a	542	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
438471b6 BP	543	&cifs_cifs_ntsd_xattr_handler,
438471b6 BP	544	&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
3970acf7 BP	545	&cifs_cifs_ntsd_full_xattr_handler,
3970acf7 BP	546	&smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
a9ae008f AG	547	&cifs_posix_acl_access_xattr_handler,
	548	&cifs_posix_acl_default_xattr_handler,
	549	NULL
	550	};