195 lines
6.5 KiB
C
195 lines
6.5 KiB
C
/*
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* fs/cifs/cifsacl.h
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*
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* Copyright (c) International Business Machines Corp., 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _CIFSACL_H
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#define _CIFSACL_H
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#define NUM_AUTHS (6) /* number of authority fields */
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#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
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#define READ_BIT 0x4
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#define WRITE_BIT 0x2
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#define EXEC_BIT 0x1
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#define UBITSHIFT 6
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#define GBITSHIFT 3
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#define ACCESS_ALLOWED 0
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#define ACCESS_DENIED 1
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#define SIDOWNER 1
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#define SIDGROUP 2
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/*
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* Security Descriptor length containing DACL with 3 ACEs (one each for
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* owner, group and world).
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*/
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#define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
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sizeof(struct cifs_acl) + \
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(sizeof(struct cifs_ace) * 4))
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/*
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* Maximum size of a string representation of a SID:
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*
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* The fields are unsigned values in decimal. So:
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*
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* u8: max 3 bytes in decimal
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* u32: max 10 bytes in decimal
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*
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* "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
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*
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* For authority field, max is when all 6 values are non-zero and it must be
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* represented in hex. So "-0x" + 12 hex digits.
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*
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* Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
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*/
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#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
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#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
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struct cifs_ntsd {
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__le16 revision; /* revision level */
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__le16 type;
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__le32 osidoffset;
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__le32 gsidoffset;
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__le32 sacloffset;
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__le32 dacloffset;
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} __attribute__((packed));
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struct cifs_sid {
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__u8 revision; /* revision level */
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__u8 num_subauth;
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__u8 authority[NUM_AUTHS];
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__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
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} __attribute__((packed));
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/* size of a struct cifs_sid, sans sub_auth array */
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#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
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struct cifs_acl {
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__le16 revision; /* revision level */
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__le16 size;
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__le32 num_aces;
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} __attribute__((packed));
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/* ACE types - see MS-DTYP 2.4.4.1 */
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#define ACCESS_ALLOWED_ACE_TYPE 0x00
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#define ACCESS_DENIED_ACE_TYPE 0x01
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#define SYSTEM_AUDIT_ACE_TYPE 0x02
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#define SYSTEM_ALARM_ACE_TYPE 0x03
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#define ACCESS_ALLOWED_COMPOUND_ACE_TYPE 0x04
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#define ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05
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#define ACCESS_DENIED_OBJECT_ACE_TYPE 0x06
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#define SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07
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#define SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08
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#define ACCESS_ALLOWED_CALLBACK_ACE_TYPE 0x09
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#define ACCESS_DENIED_CALLBACK_ACE_TYPE 0x0A
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#define ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE 0x0B
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#define ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE 0x0C
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#define SYSTEM_AUDIT_CALLBACK_ACE_TYPE 0x0D
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#define SYSTEM_ALARM_CALLBACK_ACE_TYPE 0x0E /* Reserved */
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#define SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE 0x0F
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#define SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 0x10 /* reserved */
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#define SYSTEM_MANDATORY_LABEL_ACE_TYPE 0x11
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#define SYSTEM_RESOURCE_ATTRIBUTE_ACE_TYPE 0x12
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#define SYSTEM_SCOPED_POLICY_ID_ACE_TYPE 0x13
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/* ACE flags */
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#define OBJECT_INHERIT_ACE 0x01
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#define CONTAINER_INHERIT_ACE 0x02
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#define NO_PROPAGATE_INHERIT_ACE 0x04
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#define INHERIT_ONLY_ACE 0x08
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#define INHERITED_ACE 0x10
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#define SUCCESSFUL_ACCESS_ACE_FLAG 0x40
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#define FAILED_ACCESS_ACE_FLAG 0x80
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struct cifs_ace {
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__u8 type; /* see above and MS-DTYP 2.4.4.1 */
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__u8 flags;
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__le16 size;
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__le32 access_req;
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struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
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} __attribute__((packed));
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/*
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* The current SMB3 form of security descriptor is similar to what was used for
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* cifs (see above) but some fields are split, and fields in the struct below
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* matches names of fields to the the spec, MS-DTYP (see sections 2.4.5 and
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* 2.4.6). Note that "CamelCase" fields are used in this struct in order to
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* match the MS-DTYP and MS-SMB2 specs which define the wire format.
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*/
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struct smb3_sd {
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__u8 Revision; /* revision level, MUST be one */
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__u8 Sbz1; /* only meaningful if 'RM' flag set below */
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__le16 Control;
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__le32 OffsetOwner;
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__le32 OffsetGroup;
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__le32 OffsetSacl;
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__le32 OffsetDacl;
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} __packed;
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/* Meaning of 'Control' field flags */
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#define ACL_CONTROL_SR 0x0001 /* Self relative */
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#define ACL_CONTROL_RM 0x0002 /* Resource manager control bits */
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#define ACL_CONTROL_PS 0x0004 /* SACL protected from inherits */
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#define ACL_CONTROL_PD 0x0008 /* DACL protected from inherits */
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#define ACL_CONTROL_SI 0x0010 /* SACL Auto-Inherited */
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#define ACL_CONTROL_DI 0x0020 /* DACL Auto-Inherited */
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#define ACL_CONTROL_SC 0x0040 /* SACL computed through inheritance */
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#define ACL_CONTROL_DC 0x0080 /* DACL computed through inheritence */
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#define ACL_CONTROL_SS 0x0100 /* Create server ACL */
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#define ACL_CONTROL_DT 0x0200 /* DACL provided by trusteed source */
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#define ACL_CONTROL_SD 0x0400 /* SACL defaulted */
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#define ACL_CONTROL_SP 0x0800 /* SACL is present on object */
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#define ACL_CONTROL_DD 0x1000 /* DACL defaulted */
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#define ACL_CONTROL_DP 0x2000 /* DACL is present on object */
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#define ACL_CONTROL_GD 0x4000 /* Group was defaulted */
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#define ACL_CONTROL_OD 0x8000 /* User was defaulted */
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/* Meaning of AclRevision flags */
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#define ACL_REVISION 0x02 /* See section 2.4.4.1 of MS-DTYP */
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#define ACL_REVISION_DS 0x04 /* Additional AceTypes allowed */
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struct smb3_acl {
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u8 AclRevision; /* revision level */
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u8 Sbz1; /* MBZ */
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__le16 AclSize;
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__le16 AceCount;
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__le16 Sbz2; /* MBZ */
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} __packed;
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/*
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* Minimum security identifier can be one for system defined Users
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* and Groups such as NULL SID and World or Built-in accounts such
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* as Administrator and Guest and consists of
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* Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
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*/
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#define MIN_SID_LEN (1 + 1 + 6 + 4) /* in bytes */
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/*
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* Minimum security descriptor can be one without any SACL and DACL and can
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* consist of revision, type, and two sids of minimum size for owner and group
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*/
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#define MIN_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + (2 * MIN_SID_LEN))
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#endif /* _CIFSACL_H */
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