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SMB3: Add support for getting and setting SACLs 

Add SYSTEM_SECURITY access flag and use with smb2 when opening
files for getting/setting SACLs. Add "system.cifs_ntsd_full"
extended attribute to allow user-space access to the functionality.
Avoid multiple server calls when setting owner, DACL, and SACL.

Signed-off-by: Boris Protopopov <pboris@amazon.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Boris Protopopov 2020-12-18 11:30:12 -06:00 committed by Steve French
parent 0bf1bafb17
commit 3970acf7dd
8 changed files with 100 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/cifs/cifsacl.c
View File

@ -1195,7 +1195,8 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
}
struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
const struct cifs_fid *cifsfid, u32 *pacllen)
const struct cifs_fid *cifsfid, u32 *pacllen,
u32 __maybe_unused unused)
{
struct cifs_ntsd *pntsd = NULL;
unsigned int xid;
@ -1263,7 +1264,7 @@ static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
/* Retrieve an ACL from the server */
struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
struct inode *inode, const char *path,
u32 *pacllen)
u32 *pacllen, u32 info)
{
struct cifs_ntsd *pntsd = NULL;
struct cifsFileInfo *open_file = NULL;
@ -1273,7 +1274,7 @@ struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
if (!open_file)
return get_cifs_acl_by_path(cifs_sb, path, pacllen);
pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
cifsFileInfo_put(open_file);
return pntsd;
}
@ -1338,6 +1339,7 @@ cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
int rc = 0;
struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
struct smb_version_operations *ops;
const u32 info = 0;
cifs_dbg(NOISY, "converting ACL to mode for %s\n", path);
@ -1347,9 +1349,9 @@ cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
ops = tlink_tcon(tlink)->ses->server->ops;
if (pfid && (ops->get_acl_by_fid))
pntsd = ops->get_acl_by_fid(cifs_sb, pfid, &acllen);
pntsd = ops->get_acl_by_fid(cifs_sb, pfid, &acllen, info);
else if (ops->get_acl)
pntsd = ops->get_acl(cifs_sb, inode, path, &acllen);
pntsd = ops->get_acl(cifs_sb, inode, path, &acllen, info);
else {
cifs_put_tlink(tlink);
return -EOPNOTSUPP;
@ -1388,6 +1390,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode,
struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
struct smb_version_operations *ops;
bool mode_from_sid, id_from_sid;
const u32 info = 0;
if (IS_ERR(tlink))
return PTR_ERR(tlink);
@ -1403,7 +1406,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode,
return -EOPNOTSUPP;
}
pntsd = ops->get_acl(cifs_sb, inode, path, &secdesclen);
pntsd = ops->get_acl(cifs_sb, inode, path, &secdesclen, info);
if (IS_ERR(pntsd)) {
rc = PTR_ERR(pntsd);
cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc);

4
fs/cifs/cifsglob.h
View File

@ -456,9 +456,9 @@ struct smb_version_operations {
const char *, const void *, const __u16,
const struct nls_table *, struct cifs_sb_info *);
struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
const char *, u32 *);
const char *, u32 *, u32);
struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
const struct cifs_fid *, u32 *);
const struct cifs_fid *, u32 *, u32);
int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
int);
/* writepages retry size */

2
fs/cifs/cifspdu.h
View File

@ -240,6 +240,8 @@
#define SYNCHRONIZE 0x00100000 /* The file handle can waited on to */
/* synchronize with the completion */
/* of an input/output request */
#define SYSTEM_SECURITY 0x01000000 /* The system access control list */
/* can be read and changed */
#define GENERIC_ALL 0x10000000
#define GENERIC_EXECUTE 0x20000000
#define GENERIC_WRITE 0x40000000

4
fs/cifs/cifsproto.h
View File

@ -218,9 +218,9 @@ extern int cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb,
extern int id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode,
kuid_t uid, kgid_t gid);
extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *,
const char *, u32 *);
const char *, u32 *, u32);
extern struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *,
const struct cifs_fid *, u32 *);
const struct cifs_fid *, u32 *, u32);
extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *,
const char *, int);
extern unsigned int setup_authusers_ACE(struct cifs_ace *pace);

31
fs/cifs/smb2ops.c
View File

@ -3214,7 +3214,7 @@ smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
static struct cifs_ntsd *
get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
const struct cifs_fid *cifsfid, u32 *pacllen)
const struct cifs_fid *cifsfid, u32 *pacllen, u32 info)
{
struct cifs_ntsd *pntsd = NULL;
unsigned int xid;
@ -3228,7 +3228,8 @@ get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
cifs_dbg(FYI, "trying to get acl\n");
rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
cifsfid->volatile_fid, (void **)&pntsd, pacllen);
cifsfid->volatile_fid, (void **)&pntsd, pacllen,
info);
free_xid(xid);
cifs_put_tlink(tlink);
@ -3242,7 +3243,7 @@ get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
static struct cifs_ntsd *
get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
const char *path, u32 *pacllen)
const char *path, u32 *pacllen, u32 info)
{
struct cifs_ntsd *pntsd = NULL;
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
@ -3280,12 +3281,16 @@ get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
oparms.fid = &fid;
oparms.reconnect = false;
if (info & SACL_SECINFO)
oparms.desired_access |= SYSTEM_SECURITY;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
NULL);
kfree(utf16_path);
if (!rc) {
rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
fid.volatile_fid, (void **)&pntsd, pacllen);
fid.volatile_fid, (void **)&pntsd, pacllen,
info);
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
}
@ -3319,10 +3324,12 @@ set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
tcon = tlink_tcon(tlink);
xid = get_xid();
if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
access_flags = WRITE_OWNER;
else
access_flags = WRITE_DAC;
if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP)
access_flags |= WRITE_OWNER;
if (aclflag & CIFS_ACL_SACL)
access_flags |= SYSTEM_SECURITY;
if (aclflag & CIFS_ACL_DACL)
access_flags |= WRITE_DAC;
utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
if (!utf16_path) {
@ -3356,8 +3363,8 @@ set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
/* Retrieve an ACL from the server */
static struct cifs_ntsd *
get_smb2_acl(struct cifs_sb_info *cifs_sb,
struct inode *inode, const char *path,
u32 *pacllen)
struct inode *inode, const char *path,
u32 *pacllen, u32 info)
{
struct cifs_ntsd *pntsd = NULL;
struct cifsFileInfo *open_file = NULL;
@ -3365,9 +3372,9 @@ get_smb2_acl(struct cifs_sb_info *cifs_sb,
if (inode)
open_file = find_readable_file(CIFS_I(inode), true);
if (!open_file)
return get_smb2_acl_by_path(cifs_sb, path, pacllen);
return get_smb2_acl_by_path(cifs_sb, path, pacllen, info);
pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
cifsFileInfo_put(open_file);
return pntsd;
}

5
fs/cifs/smb2pdu.c
View File

@ -3479,10 +3479,9 @@ SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
int
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
void **data, u32 *plen)
u64 persistent_fid, u64 volatile_fid,
void **data, u32 *plen, u32 additional_info)
{
__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
*plen = 0;
return query_info(xid, tcon, persistent_fid, volatile_fid,

4
fs/cifs/smb2proto.h
View File

@ -200,8 +200,8 @@ extern int SMB2_query_info_init(struct cifs_tcon *tcon,
size_t input_len, void *input);
extern void SMB2_query_info_free(struct smb_rqst *rqst);
extern int SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_file_id, u64 volatile_file_id,
void **data, unsigned int *plen);
u64 persistent_file_id, u64 volatile_file_id,
void **data, unsigned int *plen, u32 info);
extern int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
__le64 *uniqueid);

83
fs/cifs/xattr.c
View File

@ -34,6 +34,7 @@
#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 */
/*
@ -43,12 +44,13 @@
*/
#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, XATTR_CIFS_NTSD_FULL };
static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
struct inode *inode, char *full_path,
@ -164,7 +166,8 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
break;
case XATTR_CIFS_ACL:
case XATTR_CIFS_NTSD: {
case XATTR_CIFS_NTSD:
case XATTR_CIFS_NTSD_FULL: {
struct cifs_ntsd *pacl;
if (!value)
@ -174,23 +177,27 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
rc = -ENOMEM;
} else {
memcpy(pacl, value, size);
if (value &&
pTcon->ses->server->ops->set_acl) {
if (pTcon->ses->server->ops->set_acl) {
int aclflags = 0;
rc = 0;
if (handler->flags == XATTR_CIFS_NTSD) {
/* set owner and DACL */
rc = pTcon->ses->server->ops->set_acl(
pacl, size, inode,
full_path,
CIFS_ACL_OWNER);
}
if (rc == 0) {
/* set DACL */
rc = pTcon->ses->server->ops->set_acl(
pacl, size, inode,
full_path,
CIFS_ACL_DACL);
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;
}
@ -327,16 +334,27 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
break;
case XATTR_CIFS_ACL:
case XATTR_CIFS_NTSD: {
/* the whole ntsd is fetched regardless */
u32 acllen;
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, additional_info = 0;
struct cifs_ntsd *pacl;
if (pTcon->ses->server->ops->get_acl == NULL)
goto out; /* rc already EOPNOTSUPP */
if (handler->flags == XATTR_CIFS_NTSD_FULL) {
additional_info = OWNER_SECINFO | GROUP_SECINFO |
DACL_SECINFO | SACL_SECINFO;
} else {
additional_info = OWNER_SECINFO | GROUP_SECINFO |
DACL_SECINFO;
}
pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
inode, full_path, &acllen);
inode, full_path, &acllen, additional_info);
if (IS_ERR(pacl)) {
rc = PTR_ERR(pacl);
cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
@ -486,6 +504,27 @@ static const struct xattr_handler smb3_ntsd_xattr_handler = {
.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,
@ -507,6 +546,8 @@ const struct xattr_handler *cifs_xattr_handlers[] = {
&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