fs/cifs/cifsacl.h

   1 /*
   2  *   fs/cifs/cifsacl.h
   3  *
   4  *   Copyright (c) International Business Machines  Corp., 2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #ifndef _CIFSACL_H
  23 #define _CIFSACL_H
  24
  25
  26 #define NUM_AUTHS (6)   /* number of authority fields */
  27 #define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
  28
  29 #define READ_BIT        0x4
  30 #define WRITE_BIT       0x2
  31 #define EXEC_BIT        0x1
  32
  33 #define ACL_OWNER_MASK 0700
  34 #define ACL_GROUP_MASK 0770
  35 #define ACL_EVERYONE_MASK 0777
  36
  37 #define UBITSHIFT       6
  38 #define GBITSHIFT       3
  39
  40 #define ACCESS_ALLOWED  0
  41 #define ACCESS_DENIED   1
  42
  43 #define SIDOWNER 1
  44 #define SIDGROUP 2
  45
  46 /*
  47  * Security Descriptor length containing DACL with 3 ACEs (one each for
  48  * owner, group and world).
  49  */
  50 #define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
  51                               sizeof(struct cifs_acl) + \
  52                               (sizeof(struct cifs_ace) * 4))
  53
  54 /*
  55  * Maximum size of a string representation of a SID:
  56  *
  57  * The fields are unsigned values in decimal. So:
  58  *
  59  * u8:  max 3 bytes in decimal
  60  * u32: max 10 bytes in decimal
  61  *
  62  * "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
  63  *
  64  * For authority field, max is when all 6 values are non-zero and it must be
  65  * represented in hex. So "-0x" + 12 hex digits.
  66  *
  67  * Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
  68  */
  69 #define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
  70 #define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
  71
  72 struct cifs_ntsd {
  73         __le16 revision; /* revision level */
  74         __le16 type;
  75         __le32 osidoffset;
  76         __le32 gsidoffset;
  77         __le32 sacloffset;
  78         __le32 dacloffset;
  79 } __attribute__((packed));
  80
  81 struct cifs_sid {
  82         __u8 revision; /* revision level */
  83         __u8 num_subauth;
  84         __u8 authority[NUM_AUTHS];
  85         __le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
  86 } __attribute__((packed));
  87
  88 /* size of a struct cifs_sid, sans sub_auth array */
  89 #define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
  90
  91 struct cifs_acl {
  92         __le16 revision; /* revision level */
  93         __le16 size;
  94         __le32 num_aces;
  95 } __attribute__((packed));
  96
  97 /* ACE types - see MS-DTYP 2.4.4.1 */
  98 #define ACCESS_ALLOWED_ACE_TYPE 0x00
  99 #define ACCESS_DENIED_ACE_TYPE  0x01
 100 #define SYSTEM_AUDIT_ACE_TYPE   0x02
 101 #define SYSTEM_ALARM_ACE_TYPE   0x03
 102 #define ACCESS_ALLOWED_COMPOUND_ACE_TYPE 0x04
 103 #define ACCESS_ALLOWED_OBJECT_ACE_TYPE  0x05
 104 #define ACCESS_DENIED_OBJECT_ACE_TYPE   0x06
 105 #define SYSTEM_AUDIT_OBJECT_ACE_TYPE    0x07
 106 #define SYSTEM_ALARM_OBJECT_ACE_TYPE    0x08
 107 #define ACCESS_ALLOWED_CALLBACK_ACE_TYPE 0x09
 108 #define ACCESS_DENIED_CALLBACK_ACE_TYPE 0x0A
 109 #define ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE 0x0B
 110 #define ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE  0x0C
 111 #define SYSTEM_AUDIT_CALLBACK_ACE_TYPE  0x0D
 112 #define SYSTEM_ALARM_CALLBACK_ACE_TYPE  0x0E /* Reserved */
 113 #define SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE 0x0F
 114 #define SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 0x10 /* reserved */
 115 #define SYSTEM_MANDATORY_LABEL_ACE_TYPE 0x11
 116 #define SYSTEM_RESOURCE_ATTRIBUTE_ACE_TYPE 0x12
 117 #define SYSTEM_SCOPED_POLICY_ID_ACE_TYPE 0x13
 118
 119 /* ACE flags */
 120 #define OBJECT_INHERIT_ACE      0x01
 121 #define CONTAINER_INHERIT_ACE   0x02
 122 #define NO_PROPAGATE_INHERIT_ACE 0x04
 123 #define INHERIT_ONLY_ACE        0x08
 124 #define INHERITED_ACE           0x10
 125 #define SUCCESSFUL_ACCESS_ACE_FLAG 0x40
 126 #define FAILED_ACCESS_ACE_FLAG  0x80
 127
 128 struct cifs_ace {
 129         __u8 type; /* see above and MS-DTYP 2.4.4.1 */
 130         __u8 flags;
 131         __le16 size;
 132         __le32 access_req;
 133         struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
 134 } __attribute__((packed));
 135
 136 /*
 137  * The current SMB3 form of security descriptor is similar to what was used for
 138  * cifs (see above) but some fields are split, and fields in the struct below
 139  * matches names of fields to the spec, MS-DTYP (see sections 2.4.5 and
 140  * 2.4.6). Note that "CamelCase" fields are used in this struct in order to
 141  * match the MS-DTYP and MS-SMB2 specs which define the wire format.
 142  */
 143 struct smb3_sd {
 144         __u8 Revision; /* revision level, MUST be one */
 145         __u8 Sbz1; /* only meaningful if 'RM' flag set below */
 146         __le16 Control;
 147         __le32 OffsetOwner;
 148         __le32 OffsetGroup;
 149         __le32 OffsetSacl;
 150         __le32 OffsetDacl;
 151 } __packed;
 152
 153 /* Meaning of 'Control' field flags */
 154 #define ACL_CONTROL_SR  0x8000  /* Self relative */
 155 #define ACL_CONTROL_RM  0x4000  /* Resource manager control bits */
 156 #define ACL_CONTROL_PS  0x2000  /* SACL protected from inherits */
 157 #define ACL_CONTROL_PD  0x1000  /* DACL protected from inherits */
 158 #define ACL_CONTROL_SI  0x0800  /* SACL Auto-Inherited */
 159 #define ACL_CONTROL_DI  0x0400  /* DACL Auto-Inherited */
 160 #define ACL_CONTROL_SC  0x0200  /* SACL computed through inheritance */
 161 #define ACL_CONTROL_DC  0x0100  /* DACL computed through inheritence */
 162 #define ACL_CONTROL_SS  0x0080  /* Create server ACL */
 163 #define ACL_CONTROL_DT  0x0040  /* DACL provided by trusted source */
 164 #define ACL_CONTROL_SD  0x0020  /* SACL defaulted */
 165 #define ACL_CONTROL_SP  0x0010  /* SACL is present on object */
 166 #define ACL_CONTROL_DD  0x0008  /* DACL defaulted */
 167 #define ACL_CONTROL_DP  0x0004  /* DACL is present on object */
 168 #define ACL_CONTROL_GD  0x0002  /* Group was defaulted */
 169 #define ACL_CONTROL_OD  0x0001  /* User was defaulted */
 170
 171 /* Meaning of AclRevision flags */
 172 #define ACL_REVISION    0x02 /* See section 2.4.4.1 of MS-DTYP */
 173 #define ACL_REVISION_DS 0x04 /* Additional AceTypes allowed */
 174
 175 struct smb3_acl {
 176         u8 AclRevision; /* revision level */
 177         u8 Sbz1; /* MBZ */
 178         __le16 AclSize;
 179         __le16 AceCount;
 180         __le16 Sbz2; /* MBZ */
 181 } __packed;
 182
 183 /*
 184  * Used to store the special 'NFS SIDs' used to persist the POSIX uid and gid
 185  * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
 186  */
 187 struct owner_sid {
 188         u8 Revision;
 189         u8 NumAuth;
 190         u8 Authority[6];
 191         __le32 SubAuthorities[3];
 192 } __packed;
 193
 194 struct owner_group_sids {
 195         struct owner_sid owner;
 196         struct owner_sid group;
 197 } __packed;
 198
 199 /*
 200  * Minimum security identifier can be one for system defined Users
 201  * and Groups such as NULL SID and World or Built-in accounts such
 202  * as Administrator and Guest and consists of
 203  * Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
 204  */
 205 #define MIN_SID_LEN  (1 + 1 + 6 + 4) /* in bytes */
 206
 207 /*
 208  * Minimum security descriptor can be one without any SACL and DACL and can
 209  * consist of revision, type, and two sids of minimum size for owner and group
 210  */
 211 #define MIN_SEC_DESC_LEN  (sizeof(struct cifs_ntsd) + (2 * MIN_SID_LEN))
 212
 213 #endif /* _CIFSACL_H */