/* * 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 ACL_OWNER_MASK 0700 #define ACL_GROUP_MASK 0070 #define ACL_EVERYONE_MASK 0007 #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 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 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 */