fs/smb/client/cifsacl.h

   1 /* SPDX-License-Identifier: LGPL-2.1 */
   2 /*
   3  *
   4  *   Copyright (c) International Business Machines  Corp., 2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  */
   8
   9 #ifndef _CIFSACL_H
  10 #define _CIFSACL_H
  11
  12 #include "../common/smbacl.h"
  13
  14 #define READ_BIT        0x4
  15 #define WRITE_BIT       0x2
  16 #define EXEC_BIT        0x1
  17
  18 #define ACL_OWNER_MASK 0700
  19 #define ACL_GROUP_MASK 0070
  20 #define ACL_EVERYONE_MASK 0007
  21
  22 #define UBITSHIFT       6
  23 #define GBITSHIFT       3
  24
  25 /*
  26  * Security Descriptor length containing DACL with 3 ACEs (one each for
  27  * owner, group and world).
  28  */
  29 #define DEFAULT_SEC_DESC_LEN (sizeof(struct smb_ntsd) + \
  30                               sizeof(struct smb_acl) + \
  31                               (sizeof(struct smb_ace) * 4))
  32
  33 /*
  34  * The current SMB3 form of security descriptor is similar to what was used for
  35  * cifs (see above) but some fields are split, and fields in the struct below
  36  * matches names of fields to the spec, MS-DTYP (see sections 2.4.5 and
  37  * 2.4.6). Note that "CamelCase" fields are used in this struct in order to
  38  * match the MS-DTYP and MS-SMB2 specs which define the wire format.
  39  */
  40 struct smb3_sd {
  41         __u8 Revision; /* revision level, MUST be one */
  42         __u8 Sbz1; /* only meaningful if 'RM' flag set below */
  43         __le16 Control;
  44         __le32 OffsetOwner;
  45         __le32 OffsetGroup;
  46         __le32 OffsetSacl;
  47         __le32 OffsetDacl;
  48 } __packed;
  49
  50 /* Meaning of 'Control' field flags */
  51 #define ACL_CONTROL_SR  0x8000  /* Self relative */
  52 #define ACL_CONTROL_RM  0x4000  /* Resource manager control bits */
  53 #define ACL_CONTROL_PS  0x2000  /* SACL protected from inherits */
  54 #define ACL_CONTROL_PD  0x1000  /* DACL protected from inherits */
  55 #define ACL_CONTROL_SI  0x0800  /* SACL Auto-Inherited */
  56 #define ACL_CONTROL_DI  0x0400  /* DACL Auto-Inherited */
  57 #define ACL_CONTROL_SC  0x0200  /* SACL computed through inheritance */
  58 #define ACL_CONTROL_DC  0x0100  /* DACL computed through inheritance */
  59 #define ACL_CONTROL_SS  0x0080  /* Create server ACL */
  60 #define ACL_CONTROL_DT  0x0040  /* DACL provided by trusted source */
  61 #define ACL_CONTROL_SD  0x0020  /* SACL defaulted */
  62 #define ACL_CONTROL_SP  0x0010  /* SACL is present on object */
  63 #define ACL_CONTROL_DD  0x0008  /* DACL defaulted */
  64 #define ACL_CONTROL_DP  0x0004  /* DACL is present on object */
  65 #define ACL_CONTROL_GD  0x0002  /* Group was defaulted */
  66 #define ACL_CONTROL_OD  0x0001  /* User was defaulted */
  67
  68 /* Meaning of AclRevision flags */
  69 #define ACL_REVISION    0x02 /* See section 2.4.4.1 of MS-DTYP */
  70 #define ACL_REVISION_DS 0x04 /* Additional AceTypes allowed */
  71
  72 struct smb3_acl {
  73         u8 AclRevision; /* revision level */
  74         u8 Sbz1; /* MBZ */
  75         __le16 AclSize;
  76         __le16 AceCount;
  77         __le16 Sbz2; /* MBZ */
  78 } __packed;
  79
  80 /*
  81  * Used to store the special 'NFS SIDs' used to persist the POSIX uid and gid
  82  * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
  83  */
  84 struct owner_sid {
  85         u8 Revision;
  86         u8 NumAuth;
  87         u8 Authority[6];
  88         __le32 SubAuthorities[3];
  89 } __packed;
  90
  91 struct owner_group_sids {
  92         struct owner_sid owner;
  93         struct owner_sid group;
  94 } __packed;
  95
  96 /*
  97  * Minimum security identifier can be one for system defined Users
  98  * and Groups such as NULL SID and World or Built-in accounts such
  99  * as Administrator and Guest and consists of
 100  * Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
 101  */
 102 #define MIN_SID_LEN  (1 + 1 + 6 + 4) /* in bytes */
 103
 104 /*
 105  * Minimum security descriptor can be one without any SACL and DACL and can
 106  * consist of revision, type, and two sids of minimum size for owner and group
 107  */
 108 #define MIN_SEC_DESC_LEN  (sizeof(struct smb_ntsd) + (2 * MIN_SID_LEN))
 109
 110 #endif /* _CIFSACL_H */