fs/smb/client/cifsacl.h

Source file repositories/reference/linux-study-clean/fs/smb/client/cifsacl.h

File Facts

System
Linux kernel
Corpus path
fs/smb/client/cifsacl.h
Extension
.h
Size
3537 bytes
Lines
111
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct smb3_sd {
	__u8 Revision; /* revision level, MUST be one */
	__u8 Sbz1; /* only meaningful if 'RM' flag set below */
	__le16 Control;
	__le32 OffsetOwner;
	__le32 OffsetGroup;
	__le32 OffsetSacl;
	__le32 OffsetDacl;
} __packed;

/* Meaning of 'Control' field flags */
#define ACL_CONTROL_SR	0x8000	/* Self relative */
#define ACL_CONTROL_RM	0x4000	/* Resource manager control bits */
#define ACL_CONTROL_PS	0x2000	/* SACL protected from inherits */
#define ACL_CONTROL_PD	0x1000	/* DACL protected from inherits */
#define ACL_CONTROL_SI	0x0800	/* SACL Auto-Inherited */
#define ACL_CONTROL_DI	0x0400	/* DACL Auto-Inherited */
#define ACL_CONTROL_SC	0x0200	/* SACL computed through inheritance */
#define ACL_CONTROL_DC	0x0100	/* DACL computed through inheritance */
#define ACL_CONTROL_SS	0x0080	/* Create server ACL */
#define ACL_CONTROL_DT	0x0040	/* DACL provided by trusted source */
#define ACL_CONTROL_SD	0x0020	/* SACL defaulted */
#define ACL_CONTROL_SP	0x0010	/* SACL is present on object */
#define ACL_CONTROL_DD	0x0008	/* DACL defaulted */
#define ACL_CONTROL_DP	0x0004	/* DACL is present on object */
#define ACL_CONTROL_GD	0x0002	/* Group was defaulted */
#define ACL_CONTROL_OD	0x0001	/* User was defaulted */

/* Meaning of AclRevision flags */
#define ACL_REVISION	0x02 /* See section 2.4.4.1 of MS-DTYP */
#define ACL_REVISION_DS	0x04 /* Additional AceTypes allowed */

struct smb3_acl {
	u8 AclRevision; /* revision level */
	u8 Sbz1; /* MBZ */
	__le16 AclSize;
	__le16 AceCount;
	__le16 Sbz2; /* MBZ */
} __packed;

/*
 * Used to store the special 'NFS SIDs' used to persist the POSIX uid and gid
 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
 */
struct owner_sid {
	u8 Revision;
	u8 NumAuth;
	u8 Authority[6];
	__le32 SubAuthorities[3];
} __packed;

struct owner_group_sids {
	struct owner_sid owner;
	struct owner_sid group;
} __packed;

/*
 * Minimum security identifier can be one for system defined Users
 * and Groups such as NULL SID and World or Built-in accounts such
 * as Administrator and Guest and consists of
 * Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
 */
#define MIN_SID_LEN  (1 + 1 + 6 + 4) /* in bytes */

/*
 * Minimum security descriptor can be one without any SACL and DACL and can
 * consist of revision, type, and two sids of minimum size for owner and group
 */
#define MIN_SEC_DESC_LEN  (sizeof(struct smb_ntsd) + (2 * MIN_SID_LEN))

#endif /* _CIFSACL_H */

Annotation

Implementation Notes