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-rw-r--r--fs/smb/client/xattr.c491
1 files changed, 491 insertions, 0 deletions
diff --git a/fs/smb/client/xattr.c b/fs/smb/client/xattr.c
new file mode 100644
index 000000000000..4ad5531686d8
--- /dev/null
+++ b/fs/smb/client/xattr.c
@@ -0,0 +1,491 @@
+// 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 mnt_idmap *idmap,
+ 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_GROUP |
+ CIFS_ACL_DACL |
+ CIFS_ACL_SACL);
+ break;
+ case XATTR_CIFS_NTSD:
+ aclflags = (CIFS_ACL_OWNER |
+ CIFS_ACL_GROUP |
+ 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;
+ }
+ }
+
+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;
+ }
+ }
+
+ /* 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,
+};
+
+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" */
+ NULL
+};
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