fs/cifs/cifsacl.h - linux - Git at Google

 /*
  *   fs/cifs/cifsacl.h
  *
  *   Copyright (c) International Business Machines  Corp., 2007
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  *   This library is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU Lesser General Public License as published
  *   by the Free Software Foundation; either version 2.1 of the License, or
  *   (at your option) any later version.
  *
  *   This library is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  *   the GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
  *   along with this library; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #ifndef _CIFSACL_H
 #define _CIFSACL_H


 #define NUM_AUTHS (6)	/* number of authority fields */
 #define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */

 #define READ_BIT        0x4
 #define WRITE_BIT       0x2
 #define EXEC_BIT        0x1

 #define UBITSHIFT	6
 #define GBITSHIFT	3

 #define ACCESS_ALLOWED	0
 #define ACCESS_DENIED	1

 #define SIDOWNER 1
 #define SIDGROUP 2

 /*
  * Security Descriptor length containing DACL with 3 ACEs (one each for
  * owner, group and world).
  */
 #define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
 			      sizeof(struct cifs_acl) + \
 			      (sizeof(struct cifs_ace) * 4))

 /*
  * Maximum size of a string representation of a SID:
  *
  * The fields are unsigned values in decimal. So:
  *
  * u8:  max 3 bytes in decimal
  * u32: max 10 bytes in decimal
  *
  * "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
  *
  * For authority field, max is when all 6 values are non-zero and it must be
  * represented in hex. So "-0x" + 12 hex digits.
  *
  * Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
  */
 #define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
 #define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */

 struct cifs_ntsd {
 	__le16 revision; /* revision level */
 	__le16 type;
 	__le32 osidoffset;
 	__le32 gsidoffset;
 	__le32 sacloffset;
 	__le32 dacloffset;
 } __attribute__((packed));

 struct cifs_sid {
 	__u8 revision; /* revision level */
 	__u8 num_subauth;
 	__u8 authority[NUM_AUTHS];
 	__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
 } __attribute__((packed));

 /* size of a struct cifs_sid, sans sub_auth array */
 #define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)

 struct cifs_acl {
 	__le16 revision; /* revision level */
 	__le16 size;
 	__le32 num_aces;
 } __attribute__((packed));

 /* ACE types - see MS-DTYP 2.4.4.1 */
 #define ACCESS_ALLOWED_ACE_TYPE	0x00
 #define ACCESS_DENIED_ACE_TYPE	0x01
 #define SYSTEM_AUDIT_ACE_TYPE	0x02
 #define SYSTEM_ALARM_ACE_TYPE	0x03
 #define ACCESS_ALLOWED_COMPOUND_ACE_TYPE 0x04
 #define ACCESS_ALLOWED_OBJECT_ACE_TYPE	0x05
 #define ACCESS_DENIED_OBJECT_ACE_TYPE	0x06
 #define SYSTEM_AUDIT_OBJECT_ACE_TYPE	0x07
 #define SYSTEM_ALARM_OBJECT_ACE_TYPE	0x08
 #define ACCESS_ALLOWED_CALLBACK_ACE_TYPE 0x09
 #define ACCESS_DENIED_CALLBACK_ACE_TYPE	0x0A
 #define ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE 0x0B
 #define ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE  0x0C
 #define SYSTEM_AUDIT_CALLBACK_ACE_TYPE	0x0D
 #define SYSTEM_ALARM_CALLBACK_ACE_TYPE	0x0E /* Reserved */
 #define SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE 0x0F
 #define SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 0x10 /* reserved */
 #define SYSTEM_MANDATORY_LABEL_ACE_TYPE	0x11
 #define SYSTEM_RESOURCE_ATTRIBUTE_ACE_TYPE 0x12
 #define SYSTEM_SCOPED_POLICY_ID_ACE_TYPE 0x13

 /* ACE flags */
 #define OBJECT_INHERIT_ACE	0x01
 #define CONTAINER_INHERIT_ACE	0x02
 #define NO_PROPAGATE_INHERIT_ACE 0x04
 #define INHERIT_ONLY_ACE	0x08
 #define INHERITED_ACE		0x10
 #define SUCCESSFUL_ACCESS_ACE_FLAG 0x40
 #define FAILED_ACCESS_ACE_FLAG	0x80

 struct cifs_ace {
 	__u8 type; /* see above and MS-DTYP 2.4.4.1 */
 	__u8 flags;
 	__le16 size;
 	__le32 access_req;
 	struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
 } __attribute__((packed));

 /*
  * The current SMB3 form of security descriptor is similar to what was used for
  * cifs (see above) but some fields are split, and fields in the struct below
  * matches names of fields to the the spec, MS-DTYP (see sections 2.4.5 and
  * 2.4.6). Note that "CamelCase" fields are used in this struct in order to
  * match the MS-DTYP and MS-SMB2 specs which define the wire format.
  */
 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 inheritence */
 #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 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 cifs_ntsd) + (2 * MIN_SID_LEN))

 #endif /* _CIFSACL_H */
	/*
	* fs/cifs/cifsacl.h
	*
	* Copyright (c) International Business Machines Corp., 2007
	* Author(s): Steve French (sfrench@us.ibm.com)
	*
	* This library is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Lesser General Public License as published
	* by the Free Software Foundation; either version 2.1 of the License, or
	* (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	* the GNU Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with this library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#ifndef _CIFSACL_H
	#define _CIFSACL_H


	#define NUM_AUTHS (6) /* number of authority fields */
	#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */

	#define READ_BIT 0x4
	#define WRITE_BIT 0x2
	#define EXEC_BIT 0x1

	#define UBITSHIFT 6
	#define GBITSHIFT 3

	#define ACCESS_ALLOWED 0
	#define ACCESS_DENIED 1

	#define SIDOWNER 1
	#define SIDGROUP 2

	/*
	* Security Descriptor length containing DACL with 3 ACEs (one each for
	* owner, group and world).
	*/
	#define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
	sizeof(struct cifs_acl) + \
	(sizeof(struct cifs_ace) * 4))

	/*
	* Maximum size of a string representation of a SID:
	*
	* The fields are unsigned values in decimal. So:
	*
	* u8: max 3 bytes in decimal
	* u32: max 10 bytes in decimal
	*
	* "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
	*
	* For authority field, max is when all 6 values are non-zero and it must be
	* represented in hex. So "-0x" + 12 hex digits.
	*
	* Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
	*/
	#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
	#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */

	struct cifs_ntsd {
	__le16 revision; /* revision level */
	__le16 type;
	__le32 osidoffset;
	__le32 gsidoffset;
	__le32 sacloffset;
	__le32 dacloffset;
	} __attribute__((packed));

	struct cifs_sid {
	__u8 revision; /* revision level */
	__u8 num_subauth;
	__u8 authority[NUM_AUTHS];
	__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
	} __attribute__((packed));

	/* size of a struct cifs_sid, sans sub_auth array */
	#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)

	struct cifs_acl {
	__le16 revision; /* revision level */
	__le16 size;
	__le32 num_aces;
	} __attribute__((packed));

	/* ACE types - see MS-DTYP 2.4.4.1 */
	#define ACCESS_ALLOWED_ACE_TYPE 0x00
	#define ACCESS_DENIED_ACE_TYPE 0x01
	#define SYSTEM_AUDIT_ACE_TYPE 0x02
	#define SYSTEM_ALARM_ACE_TYPE 0x03
	#define ACCESS_ALLOWED_COMPOUND_ACE_TYPE 0x04
	#define ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05
	#define ACCESS_DENIED_OBJECT_ACE_TYPE 0x06
	#define SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07
	#define SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08
	#define ACCESS_ALLOWED_CALLBACK_ACE_TYPE 0x09
	#define ACCESS_DENIED_CALLBACK_ACE_TYPE 0x0A
	#define ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE 0x0B
	#define ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE 0x0C
	#define SYSTEM_AUDIT_CALLBACK_ACE_TYPE 0x0D
	#define SYSTEM_ALARM_CALLBACK_ACE_TYPE 0x0E /* Reserved */
	#define SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE 0x0F
	#define SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 0x10 /* reserved */
	#define SYSTEM_MANDATORY_LABEL_ACE_TYPE 0x11
	#define SYSTEM_RESOURCE_ATTRIBUTE_ACE_TYPE 0x12
	#define SYSTEM_SCOPED_POLICY_ID_ACE_TYPE 0x13

	/* ACE flags */
	#define OBJECT_INHERIT_ACE 0x01
	#define CONTAINER_INHERIT_ACE 0x02
	#define NO_PROPAGATE_INHERIT_ACE 0x04
	#define INHERIT_ONLY_ACE 0x08
	#define INHERITED_ACE 0x10
	#define SUCCESSFUL_ACCESS_ACE_FLAG 0x40
	#define FAILED_ACCESS_ACE_FLAG 0x80

	struct cifs_ace {
	__u8 type; /* see above and MS-DTYP 2.4.4.1 */
	__u8 flags;
	__le16 size;
	__le32 access_req;
	struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
	} __attribute__((packed));

	/*
	* The current SMB3 form of security descriptor is similar to what was used for
	* cifs (see above) but some fields are split, and fields in the struct below
	* matches names of fields to the the spec, MS-DTYP (see sections 2.4.5 and
	* 2.4.6). Note that "CamelCase" fields are used in this struct in order to
	* match the MS-DTYP and MS-SMB2 specs which define the wire format.
	*/
	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 inheritence */
	#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 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 cifs_ntsd) + (2 * MIN_SID_LEN))

	#endif /* _CIFSACL_H */