forked from Minki/linux
CIFS: Add support for setting owner info, dos attributes, and create time
This is needed for backup/restore scenarios among others. Add extended attribute "system.cifs_ntsd" (and alias "system.smb3_ntsd") to allow for setting owner and DACL in the security descriptor. This is in addition to the existing "system.cifs_acl" and "system.smb3_acl" attributes that allow for setting DACL only. Add support for setting creation time and dos attributes using set_file_info() calls to complement the existing support for getting these attributes via query_path_info() calls. Signed-off-by: Boris Protopopov <bprotopopov@hotmail.com> Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Boris Protopopov
Steve French
parent
c4985c3d99
commit
438471b679
128
fs/cifs/xattr.c
128
fs/cifs/xattr.c
@ -32,7 +32,8 @@
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#include "cifs_unicode.h"
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#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
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#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
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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_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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@ -40,12 +41,62 @@
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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"
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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_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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enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
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XATTR_CIFS_NTSD };
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static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
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struct inode *inode, 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, 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 dentry *dentry, struct inode *inode,
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@ -86,6 +137,23 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
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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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@ -95,7 +163,8 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
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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_ACL:
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case XATTR_CIFS_NTSD: {
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struct cifs_ntsd *pacl;
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if (!value)
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@ -106,12 +175,25 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
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} else {
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memcpy(pacl, value, size);
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if (value &&
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pTcon->ses->server->ops->set_acl)
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rc = pTcon->ses->server->ops->set_acl(pacl,
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size, inode,
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full_path, CIFS_ACL_DACL);
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else
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pTcon->ses->server->ops->set_acl) {
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rc = 0;
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if (handler->flags == XATTR_CIFS_NTSD) {
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/* set owner and DACL */
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rc = pTcon->ses->server->ops->set_acl(
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pacl, size, inode,
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full_path,
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CIFS_ACL_OWNER);
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}
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if (rc == 0) {
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/* set DACL */
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rc = pTcon->ses->server->ops->set_acl(
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pacl, size, inode,
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full_path,
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CIFS_ACL_DACL);
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}
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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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@ -179,7 +261,7 @@ 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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__u64 *pcreatetime;
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rc = cifs_revalidate_dentry_attr(dentry);
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if (rc)
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@ -244,7 +326,9 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
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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_ACL:
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case XATTR_CIFS_NTSD: {
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/* the whole ntsd is fetched regardless */
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u32 acllen;
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struct cifs_ntsd *pacl;
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@ -382,6 +466,26 @@ static const struct xattr_handler smb3_acl_xattr_handler = {
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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_posix_acl_access_xattr_handler = {
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.name = XATTR_NAME_POSIX_ACL_ACCESS,
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.flags = XATTR_ACL_ACCESS,
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@ -401,6 +505,8 @@ const struct xattr_handler *cifs_xattr_handlers[] = {
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&cifs_os2_xattr_handler,
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&cifs_cifs_acl_xattr_handler,
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&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
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&cifs_cifs_ntsd_xattr_handler,
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&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
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&cifs_posix_acl_access_xattr_handler,
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&cifs_posix_acl_default_xattr_handler,
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NULL
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