kernel/fs/zfs/sys/zfs_acl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #ifndef _SYS_FS_ZFS_ACL_H
  26 #define _SYS_FS_ZFS_ACL_H
  27
  28 #ifdef _KERNEL
  29 #include <sys/isa_defs.h>
  30 #include <sys/types32.h>
  31 #endif
  32 #include <sys/acl.h>
  33 #include <sys/dmu.h>
  34 #include <sys/zfs_fuid.h>
  35 #include <sys/sa.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 struct znode_phys;
  42
  43 #define ACE_SLOT_CNT    6
  44 #define ZFS_ACL_VERSION_INITIAL 0ULL
  45 #define ZFS_ACL_VERSION_FUID    1ULL
  46 #define ZFS_ACL_VERSION         ZFS_ACL_VERSION_FUID
  47
  48 /*
  49  * ZFS ACLs (Access Control Lists) are stored in various forms.
  50  *
  51  * Files created with ACL version ZFS_ACL_VERSION_INITIAL
  52  * will all be created with fixed length ACEs of type
  53  * zfs_oldace_t.
  54  *
  55  * Files with ACL version ZFS_ACL_VERSION_FUID will be created
  56  * with various sized ACEs.  The abstraction entries will utilize
  57  * zfs_ace_hdr_t, normal user/group entries will use zfs_ace_t
  58  * and some specialized CIFS ACEs will use zfs_object_ace_t.
  59  */
  60
  61 /*
  62  * All ACEs have a common hdr.  For
  63  * owner@, group@, and everyone@ this is all
  64  * thats needed.
  65  */
  66 typedef struct zfs_ace_hdr {
  67         uint16_t z_type;
  68         uint16_t z_flags;
  69         uint32_t z_access_mask;
  70 } zfs_ace_hdr_t;
  71
  72 typedef zfs_ace_hdr_t zfs_ace_abstract_t;
  73
  74 /*
  75  * Standard ACE
  76  */
  77 typedef struct zfs_ace {
  78         zfs_ace_hdr_t   z_hdr;
  79         uint64_t        z_fuid;
  80 } zfs_ace_t;
  81
  82 /*
  83  * The following type only applies to ACE_ACCESS_ALLOWED|DENIED_OBJECT_ACE_TYPE
  84  * and will only be set/retrieved in a CIFS context.
  85  */
  86
  87 typedef struct zfs_object_ace {
  88         zfs_ace_t       z_ace;
  89         uint8_t         z_object_type[16]; /* object type */
  90         uint8_t         z_inherit_type[16]; /* inherited object type */
  91 } zfs_object_ace_t;
  92
  93 typedef struct zfs_oldace {
  94         uint32_t        z_fuid;         /* "who" */
  95         uint32_t        z_access_mask;  /* access mask */
  96         uint16_t        z_flags;        /* flags, i.e inheritance */
  97         uint16_t        z_type;         /* type of entry allow/deny */
  98 } zfs_oldace_t;
  99
 100 typedef struct zfs_acl_phys_v0 {
 101         uint64_t        z_acl_extern_obj;       /* ext acl pieces */
 102         uint32_t        z_acl_count;            /* Number of ACEs */
 103         uint16_t        z_acl_version;          /* acl version */
 104         uint16_t        z_acl_pad;              /* pad */
 105         zfs_oldace_t    z_ace_data[ACE_SLOT_CNT]; /* 6 standard ACEs */
 106 } zfs_acl_phys_v0_t;
 107
 108 #define ZFS_ACE_SPACE   (sizeof (zfs_oldace_t) * ACE_SLOT_CNT)
 109
 110 /*
 111  * Size of ACL count is always 2 bytes.
 112  * Necessary to for dealing with both V0 ACL and V1 ACL layout
 113  */
 114 #define ZFS_ACL_COUNT_SIZE      (sizeof (uint16_t))
 115
 116 typedef struct zfs_acl_phys {
 117         uint64_t        z_acl_extern_obj;         /* ext acl pieces */
 118         uint32_t        z_acl_size;               /* Number of bytes in ACL */
 119         uint16_t        z_acl_version;            /* acl version */
 120         uint16_t        z_acl_count;              /* ace count */
 121         uint8_t z_ace_data[ZFS_ACE_SPACE]; /* space for embedded ACEs */
 122 } zfs_acl_phys_t;
 123
 124 typedef struct acl_ops {
 125         uint32_t        (*ace_mask_get) (void *acep); /* get  access mask */
 126         void            (*ace_mask_set) (void *acep,
 127                             uint32_t mask); /* set access mask */
 128         uint16_t        (*ace_flags_get) (void *acep);  /* get flags */
 129         void            (*ace_flags_set) (void *acep,
 130                             uint16_t flags); /* set flags */
 131         uint16_t        (*ace_type_get)(void *acep); /* get type */
 132         void            (*ace_type_set)(void *acep,
 133                             uint16_t type); /* set type */
 134         uint64_t        (*ace_who_get)(void *acep); /* get who/fuid */
 135         void            (*ace_who_set)(void *acep,
 136                             uint64_t who); /* set who/fuid */
 137         size_t          (*ace_size)(void *acep); /* how big is this ace */
 138         size_t          (*ace_abstract_size)(void); /* sizeof abstract entry */
 139         int             (*ace_mask_off)(void); /* off of access mask in ace */
 140         /* ptr to data if any */
 141         int             (*ace_data)(void *acep, void **datap);
 142 } acl_ops_t;
 143
 144 /*
 145  * A zfs_acl_t structure is composed of a list of zfs_acl_node_t's.
 146  * Each node will have one or more ACEs associated with it.  You will
 147  * only have multiple nodes during a chmod operation.   Normally only
 148  * one node is required.
 149  */
 150 typedef struct zfs_acl_node {
 151         list_node_t     z_next;         /* Next chunk of ACEs */
 152         void            *z_acldata;     /* pointer into actual ACE(s) */
 153         void            *z_allocdata;   /* pointer to kmem allocated memory */
 154         size_t          z_allocsize;    /* Size of blob in bytes */
 155         size_t          z_size;         /* length of ACL data */
 156         uint64_t        z_ace_count;    /* number of ACEs in this acl node */
 157         int             z_ace_idx;      /* ace iterator positioned on */
 158 } zfs_acl_node_t;
 159
 160 typedef struct zfs_acl {
 161         uint64_t        z_acl_count;    /* Number of ACEs */
 162         size_t          z_acl_bytes;    /* Number of bytes in ACL */
 163         uint_t          z_version;      /* version of ACL */
 164         void            *z_next_ace;    /* pointer to next ACE */
 165         uint64_t        z_hints;        /* ACL hints (ZFS_INHERIT_ACE ...) */
 166         zfs_acl_node_t  *z_curr_node;   /* current node iterator is handling */
 167         list_t          z_acl;          /* chunks of ACE data */
 168         acl_ops_t       z_ops;          /* ACL operations */
 169 } zfs_acl_t;
 170
 171 typedef struct acl_locator_cb {
 172         zfs_acl_t *cb_aclp;
 173         zfs_acl_node_t *cb_acl_node;
 174 } zfs_acl_locator_cb_t;
 175
 176 #define ACL_DATA_ALLOCED        0x1
 177 #define ZFS_ACL_SIZE(aclcnt)    (sizeof (ace_t) * (aclcnt))
 178
 179 struct zfs_fuid_info;
 180
 181 typedef struct zfs_acl_ids {
 182         uint64_t                z_fuid;         /* file owner fuid */
 183         uint64_t                z_fgid;         /* file group owner fuid */
 184         uint64_t                z_mode;         /* mode to set on create */
 185         zfs_acl_t               *z_aclp;        /* ACL to create with file */
 186         struct zfs_fuid_info    *z_fuidp;       /* for tracking fuids for log */
 187 } zfs_acl_ids_t;
 188
 189 /*
 190  * Property values for acl_mode and acl_inherit.
 191  *
 192  * acl_mode can take discard, noallow, groupmask and passthrough.
 193  * whereas acl_inherit has secure instead of groupmask.
 194  */
 195
 196 #define ZFS_ACL_DISCARD         0
 197 #define ZFS_ACL_NOALLOW         1
 198 #define ZFS_ACL_GROUPMASK       2
 199 #define ZFS_ACL_PASSTHROUGH     3
 200 #define ZFS_ACL_RESTRICTED      4
 201 #define ZFS_ACL_PASSTHROUGH_X   5
 202
 203 struct znode;
 204 struct zfsvfs;
 205
 206 #ifdef _KERNEL
 207 int zfs_acl_ids_create(struct znode *, int, vattr_t *,
 208     cred_t *, vsecattr_t *, zfs_acl_ids_t *);
 209 void zfs_acl_ids_free(zfs_acl_ids_t *);
 210 boolean_t zfs_acl_ids_overquota(struct zfsvfs *, zfs_acl_ids_t *);
 211 int zfs_getacl(struct znode *, vsecattr_t *, boolean_t, cred_t *);
 212 int zfs_setacl(struct znode *, vsecattr_t *, boolean_t, cred_t *);
 213 void zfs_acl_rele(void *);
 214 void zfs_oldace_byteswap(ace_t *, int);
 215 void zfs_ace_byteswap(void *, size_t, boolean_t);
 216 extern boolean_t zfs_has_access(struct znode *zp, cred_t *cr);
 217 extern int zfs_zaccess(struct znode *, int, int, boolean_t, cred_t *);
 218 int zfs_fastaccesschk_execute(struct znode *, cred_t *);
 219 extern int zfs_zaccess_rwx(struct znode *, mode_t, int, cred_t *);
 220 extern int zfs_zaccess_unix(struct znode *, mode_t, cred_t *);
 221 extern int zfs_acl_access(struct znode *, int, cred_t *);
 222 int zfs_acl_chmod_setattr(struct znode *, zfs_acl_t **, uint64_t);
 223 int zfs_zaccess_delete(struct znode *, struct znode *, cred_t *);
 224 int zfs_zaccess_rename(struct znode *, struct znode *,
 225     struct znode *, struct znode *, cred_t *cr);
 226 void zfs_acl_free(zfs_acl_t *);
 227 int zfs_vsec_2_aclp(struct zfsvfs *, vtype_t, vsecattr_t *, cred_t *,
 228     struct zfs_fuid_info **, zfs_acl_t **);
 229 int zfs_aclset_common(struct znode *, zfs_acl_t *, cred_t *, dmu_tx_t *);
 230 uint64_t zfs_external_acl(struct znode *);
 231 int zfs_znode_acl_version(struct znode *);
 232 int zfs_acl_size(struct znode *, int *);
 233 zfs_acl_t *zfs_acl_alloc(int);
 234 zfs_acl_node_t *zfs_acl_node_alloc(size_t);
 235 void zfs_acl_xform(struct znode *, zfs_acl_t *, cred_t *);
 236 void zfs_acl_data_locator(void **, uint32_t *, uint32_t, boolean_t, void *);
 237 uint64_t zfs_mode_compute(uint64_t, zfs_acl_t *,
 238     uint64_t *, uint64_t, uint64_t);
 239 int zfs_acl_chown_setattr(struct znode *);
 240
 241 #endif
 242
 243 #ifdef  __cplusplus
 244 }
 245 #endif
 246 #endif  /* _SYS_FS_ZFS_ACL_H */