1/*- 2 * Copyright (c) 1999-2001 Robert N. M. Watson 3 * Copyright (c) 2008 Edward Tomasz Napierała <trasz@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This software was developed by Robert Watson for the TrustedBSD Project. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31/* 32 * Developed by the TrustedBSD Project. 33 * Support for POSIX.1e and NFSv4 access control lists. 34 */ 35 36#ifndef _SYS_ACL_H_ 37#define _SYS_ACL_H_ 38 39#include <sys/param.h> 40#include <sys/queue.h> 41#include <vm/uma.h> 42 43/* 44 * POSIX.1e and NFSv4 ACL types and related constants. 45 */ 46 47typedef uint32_t acl_tag_t; 48typedef uint32_t acl_perm_t; 49typedef uint16_t acl_entry_type_t; 50typedef uint16_t acl_flag_t; 51typedef int acl_type_t; 52typedef int *acl_permset_t; 53typedef uint16_t *acl_flagset_t; 54 55/* 56 * With 254 entries, "struct acl_t_struct" is exactly one 4kB page big. 57 * Note that with NFSv4 ACLs, the maximum number of ACL entries one 58 * may set on file or directory is about half of ACL_MAX_ENTRIES. 59 * 60 * If you increase this, you might also need to increase 61 * _ACL_T_ALIGNMENT_BITS in lib/libc/posix1e/acl_support.h. 62 * 63 * The maximum number of POSIX.1e ACLs is controlled 64 * by OLDACL_MAX_ENTRIES. Changing that one will break binary 65 * compatibility with pre-8.0 userland and change on-disk ACL layout. 66 */ 67#define ACL_MAX_ENTRIES 254 68 69#if defined(_KERNEL) || defined(_ACL_PRIVATE) 70 71#define POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE EXTATTR_NAMESPACE_SYSTEM 72#define POSIX1E_ACL_ACCESS_EXTATTR_NAME "posix1e.acl_access" 73#define POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE EXTATTR_NAMESPACE_SYSTEM 74#define POSIX1E_ACL_DEFAULT_EXTATTR_NAME "posix1e.acl_default" 75#define NFS4_ACL_EXTATTR_NAMESPACE EXTATTR_NAMESPACE_SYSTEM 76#define NFS4_ACL_EXTATTR_NAME "nfs4.acl" 77#define OLDACL_MAX_ENTRIES 32 78 79/* 80 * "struct oldacl" is used in compatibility ACL syscalls and for on-disk 81 * storage of POSIX.1e ACLs. 82 */ 83typedef int oldacl_tag_t; 84typedef mode_t oldacl_perm_t; 85 86struct oldacl_entry { 87 oldacl_tag_t ae_tag; 88 uid_t ae_id; 89 oldacl_perm_t ae_perm; 90}; 91typedef struct oldacl_entry *oldacl_entry_t; 92 93struct oldacl { 94 int acl_cnt; 95 struct oldacl_entry acl_entry[OLDACL_MAX_ENTRIES]; 96}; 97 98/* 99 * Current "struct acl". 100 */ 101struct acl_entry { 102 acl_tag_t ae_tag; 103 uid_t ae_id; 104 acl_perm_t ae_perm; 105 /* NFSv4 entry type, "allow" or "deny". Unused in POSIX.1e ACLs. */ 106 acl_entry_type_t ae_entry_type; 107 /* NFSv4 ACL inheritance. Unused in POSIX.1e ACLs. */ 108 acl_flag_t ae_flags; 109}; 110typedef struct acl_entry *acl_entry_t; 111 112/* 113 * Internal ACL structure, used in libc, kernel APIs and for on-disk 114 * storage of NFSv4 ACLs. POSIX.1e ACLs use "struct oldacl" for on-disk 115 * storage. 116 */ 117struct acl { 118 unsigned int acl_maxcnt; 119 unsigned int acl_cnt; 120 /* Will be required e.g. to implement NFSv4.1 ACL inheritance. */ 121 int acl_spare[4]; 122 struct acl_entry acl_entry[ACL_MAX_ENTRIES]; 123}; 124 125/* 126 * ACL structure internal to libc. 127 */ 128struct acl_t_struct { 129 struct acl ats_acl; 130 int ats_cur_entry; 131 /* 132 * ats_brand is for libc internal bookkeeping only. 133 * Applications should use acl_get_brand_np(3). 134 * Kernel code should use the "type" argument passed 135 * to VOP_SETACL, VOP_GETACL or VOP_ACLCHECK calls; 136 * ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT mean POSIX.1e 137 * ACL, ACL_TYPE_NFS4 means NFSv4 ACL. 138 */ 139 int ats_brand; 140}; 141typedef struct acl_t_struct *acl_t; 142 143#else /* _KERNEL || _ACL_PRIVATE */ 144 145typedef void *acl_entry_t; 146typedef void *acl_t; 147 148#endif /* !_KERNEL && !_ACL_PRIVATE */ 149 150/* 151 * Possible valid values for ats_brand field. 152 */ 153#define ACL_BRAND_UNKNOWN 0 154#define ACL_BRAND_POSIX 1 155#define ACL_BRAND_NFS4 2 156 157/* 158 * Possible valid values for ae_tag field. For explanation, see acl(9). 159 */ 160#define ACL_UNDEFINED_TAG 0x00000000 161#define ACL_USER_OBJ 0x00000001 162#define ACL_USER 0x00000002 163#define ACL_GROUP_OBJ 0x00000004 164#define ACL_GROUP 0x00000008 165#define ACL_MASK 0x00000010 166#define ACL_OTHER 0x00000020 167#define ACL_OTHER_OBJ ACL_OTHER 168#define ACL_EVERYONE 0x00000040 169 170/* 171 * Possible valid values for ae_entry_type field, valid only for NFSv4 ACLs. 172 */ 173#define ACL_ENTRY_TYPE_ALLOW 0x0100 174#define ACL_ENTRY_TYPE_DENY 0x0200 175#define ACL_ENTRY_TYPE_AUDIT 0x0400 176#define ACL_ENTRY_TYPE_ALARM 0x0800 177 178/* 179 * Possible valid values for acl_type_t arguments. First two 180 * are provided only for backwards binary compatibility. 181 */ 182#define ACL_TYPE_ACCESS_OLD 0x00000000 183#define ACL_TYPE_DEFAULT_OLD 0x00000001 184#define ACL_TYPE_ACCESS 0x00000002 185#define ACL_TYPE_DEFAULT 0x00000003 186#define ACL_TYPE_NFS4 0x00000004 187 188/* 189 * Possible bits in ae_perm field for POSIX.1e ACLs. Note 190 * that ACL_EXECUTE may be used in both NFSv4 and POSIX.1e ACLs. 191 */ 192#define ACL_EXECUTE 0x0001 193#define ACL_WRITE 0x0002 194#define ACL_READ 0x0004 195#define ACL_PERM_NONE 0x0000 196#define ACL_PERM_BITS (ACL_EXECUTE | ACL_WRITE | ACL_READ) 197#define ACL_POSIX1E_BITS (ACL_EXECUTE | ACL_WRITE | ACL_READ) 198 199/* 200 * Possible bits in ae_perm field for NFSv4 ACLs. 201 */ 202#define ACL_READ_DATA 0x00000008 203#define ACL_LIST_DIRECTORY 0x00000008 204#define ACL_WRITE_DATA 0x00000010 205#define ACL_ADD_FILE 0x00000010 206#define ACL_APPEND_DATA 0x00000020 207#define ACL_ADD_SUBDIRECTORY 0x00000020 208#define ACL_READ_NAMED_ATTRS 0x00000040 209#define ACL_WRITE_NAMED_ATTRS 0x00000080 210/* ACL_EXECUTE is defined above. */ 211#define ACL_DELETE_CHILD 0x00000100 212#define ACL_READ_ATTRIBUTES 0x00000200 213#define ACL_WRITE_ATTRIBUTES 0x00000400 214#define ACL_DELETE 0x00000800 215#define ACL_READ_ACL 0x00001000 216#define ACL_WRITE_ACL 0x00002000 217#define ACL_WRITE_OWNER 0x00004000 218#define ACL_SYNCHRONIZE 0x00008000 219 220#define ACL_FULL_SET (ACL_READ_DATA | ACL_WRITE_DATA | \ 221 ACL_APPEND_DATA | ACL_READ_NAMED_ATTRS | ACL_WRITE_NAMED_ATTRS | \ 222 ACL_EXECUTE | ACL_DELETE_CHILD | ACL_READ_ATTRIBUTES | \ 223 ACL_WRITE_ATTRIBUTES | ACL_DELETE | ACL_READ_ACL | ACL_WRITE_ACL | \ 224 ACL_WRITE_OWNER | ACL_SYNCHRONIZE) 225 226#define ACL_MODIFY_SET (ACL_FULL_SET & \ 227 ~(ACL_WRITE_ACL | ACL_WRITE_OWNER)) 228 229#define ACL_READ_SET (ACL_READ_DATA | ACL_READ_NAMED_ATTRS | \ 230 ACL_READ_ATTRIBUTES | ACL_READ_ACL) 231 232#define ACL_WRITE_SET (ACL_WRITE_DATA | ACL_APPEND_DATA | \ 233 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES) 234 235#define ACL_NFS4_PERM_BITS ACL_FULL_SET 236 237/* 238 * Possible entry_id values for acl_get_entry(3). 239 */ 240#define ACL_FIRST_ENTRY 0 241#define ACL_NEXT_ENTRY 1 242 243/* 244 * Possible values in ae_flags field; valid only for NFSv4 ACLs. 245 */ 246#define ACL_ENTRY_FILE_INHERIT 0x0001 247#define ACL_ENTRY_DIRECTORY_INHERIT 0x0002 248#define ACL_ENTRY_NO_PROPAGATE_INHERIT 0x0004 249#define ACL_ENTRY_INHERIT_ONLY 0x0008 250#define ACL_ENTRY_SUCCESSFUL_ACCESS 0x0010 251#define ACL_ENTRY_FAILED_ACCESS 0x0020 252 253#define ACL_FLAGS_BITS (ACL_ENTRY_FILE_INHERIT | \ 254 ACL_ENTRY_DIRECTORY_INHERIT | ACL_ENTRY_NO_PROPAGATE_INHERIT | \ 255 ACL_ENTRY_INHERIT_ONLY | ACL_ENTRY_SUCCESSFUL_ACCESS | \ 256 ACL_ENTRY_FAILED_ACCESS) 257 258/* 259 * Undefined value in ae_id field. ae_id should be set to this value 260 * iff ae_tag is ACL_USER_OBJ, ACL_GROUP_OBJ, ACL_OTHER or ACL_EVERYONE. 261 */ 262#define ACL_UNDEFINED_ID ((uid_t)-1) 263 264/* 265 * Possible values for _flags parameter in acl_to_text_np(3). 266 */ 267#define ACL_TEXT_VERBOSE 0x01 268#define ACL_TEXT_NUMERIC_IDS 0x02 269#define ACL_TEXT_APPEND_ID 0x04 270 271/* 272 * POSIX.1e ACLs are capable of expressing the read, write, and execute bits 273 * of the POSIX mode field. We provide two masks: one that defines the bits 274 * the ACL will replace in the mode, and the other that defines the bits that 275 * must be preseved when an ACL is updating a mode. 276 */ 277#define ACL_OVERRIDE_MASK (S_IRWXU | S_IRWXG | S_IRWXO) 278#define ACL_PRESERVE_MASK (~ACL_OVERRIDE_MASK) 279 280#ifdef _KERNEL 281 282/* 283 * Filesystem-independent code to move back and forth between POSIX mode and 284 * POSIX.1e ACL representations. 285 */ 286acl_perm_t acl_posix1e_mode_to_perm(acl_tag_t tag, mode_t mode); 287struct acl_entry acl_posix1e_mode_to_entry(acl_tag_t tag, uid_t uid, 288 gid_t gid, mode_t mode); 289mode_t acl_posix1e_perms_to_mode( 290 struct acl_entry *acl_user_obj_entry, 291 struct acl_entry *acl_group_obj_entry, 292 struct acl_entry *acl_other_entry); 293mode_t acl_posix1e_acl_to_mode(struct acl *acl); 294mode_t acl_posix1e_newfilemode(mode_t cmode, 295 struct acl *dacl); 296struct acl *acl_alloc(int flags); 297void acl_free(struct acl *aclp); 298 299void acl_nfs4_sync_acl_from_mode(struct acl *aclp, 300 mode_t mode, int file_owner_id); 301void acl_nfs4_sync_mode_from_acl(mode_t *mode, 302 const struct acl *aclp); 303int acl_nfs4_is_trivial(const struct acl *aclp, 304 int file_owner_id); 305void acl_nfs4_compute_inherited_acl( 306 const struct acl *parent_aclp, 307 struct acl *child_aclp, mode_t mode, 308 int file_owner_id, int is_directory); 309int acl_copy_oldacl_into_acl(const struct oldacl *source, 310 struct acl *dest); 311int acl_copy_acl_into_oldacl(const struct acl *source, 312 struct oldacl *dest); 313 314/* 315 * To allocate 'struct acl', use acl_alloc()/acl_free() instead of this. 316 */ 317MALLOC_DECLARE(M_ACL); 318/* 319 * Filesystem-independent syntax check for a POSIX.1e ACL. 320 */ 321int acl_posix1e_check(struct acl *acl); 322int acl_nfs4_check(const struct acl *aclp, int is_directory); 323 324#else /* !_KERNEL */ 325 326#if defined(_ACL_PRIVATE) 327 328/* 329 * Syscall interface -- use the library calls instead as the syscalls have 330 * strict ACL entry ordering requirements. 331 */ 332__BEGIN_DECLS 333int __acl_aclcheck_fd(int _filedes, acl_type_t _type, struct acl *_aclp); 334int __acl_aclcheck_file(const char *_path, acl_type_t _type, 335 struct acl *_aclp); 336int __acl_aclcheck_link(const char *_path, acl_type_t _type, 337 struct acl *_aclp); 338int __acl_delete_fd(int _filedes, acl_type_t _type); 339int __acl_delete_file(const char *_path_p, acl_type_t _type); 340int __acl_delete_link(const char *_path_p, acl_type_t _type); 341int __acl_get_fd(int _filedes, acl_type_t _type, struct acl *_aclp); 342int __acl_get_file(const char *_path, acl_type_t _type, struct acl *_aclp); 343int __acl_get_link(const char *_path, acl_type_t _type, struct acl *_aclp); 344int __acl_set_fd(int _filedes, acl_type_t _type, struct acl *_aclp); 345int __acl_set_file(const char *_path, acl_type_t _type, struct acl *_aclp); 346int __acl_set_link(const char *_path, acl_type_t _type, struct acl *_aclp); 347__END_DECLS 348 349#endif /* _ACL_PRIVATE */ 350 351/* 352 * Supported POSIX.1e ACL manipulation and assignment/retrieval API _np calls 353 * are local extensions that reflect an environment capable of opening file 354 * descriptors of directories, and allowing additional ACL type for different 355 * filesystems (i.e., AFS). 356 */ 357__BEGIN_DECLS 358int acl_add_flag_np(acl_flagset_t _flagset_d, acl_flag_t _flag); 359int acl_add_perm(acl_permset_t _permset_d, acl_perm_t _perm); 360int acl_calc_mask(acl_t *_acl_p); 361int acl_clear_flags_np(acl_flagset_t _flagset_d); 362int acl_clear_perms(acl_permset_t _permset_d); 363int acl_copy_entry(acl_entry_t _dest_d, acl_entry_t _src_d); 364ssize_t acl_copy_ext(void *_buf_p, acl_t _acl, ssize_t _size); 365acl_t acl_copy_int(const void *_buf_p); 366int acl_create_entry(acl_t *_acl_p, acl_entry_t *_entry_p); 367int acl_create_entry_np(acl_t *_acl_p, acl_entry_t *_entry_p, int _index); 368int acl_delete_entry(acl_t _acl, acl_entry_t _entry_d); 369int acl_delete_entry_np(acl_t _acl, int _index); 370int acl_delete_fd_np(int _filedes, acl_type_t _type); 371int acl_delete_file_np(const char *_path_p, acl_type_t _type); 372int acl_delete_link_np(const char *_path_p, acl_type_t _type); 373int acl_delete_def_file(const char *_path_p); 374int acl_delete_def_link_np(const char *_path_p); 375int acl_delete_flag_np(acl_flagset_t _flagset_d, acl_flag_t _flag); 376int acl_delete_perm(acl_permset_t _permset_d, acl_perm_t _perm); 377acl_t acl_dup(acl_t _acl); 378int acl_free(void *_obj_p); 379acl_t acl_from_text(const char *_buf_p); 380int acl_get_brand_np(acl_t _acl, int *_brand_p); 381int acl_get_entry(acl_t _acl, int _entry_id, acl_entry_t *_entry_p); 382acl_t acl_get_fd(int _fd); 383acl_t acl_get_fd_np(int fd, acl_type_t _type); 384acl_t acl_get_file(const char *_path_p, acl_type_t _type); 385int acl_get_entry_type_np(acl_entry_t _entry_d, acl_entry_type_t *_entry_type_p); 386acl_t acl_get_link_np(const char *_path_p, acl_type_t _type); 387void *acl_get_qualifier(acl_entry_t _entry_d); 388int acl_get_flag_np(acl_flagset_t _flagset_d, acl_flag_t _flag); 389int acl_get_perm_np(acl_permset_t _permset_d, acl_perm_t _perm); 390int acl_get_flagset_np(acl_entry_t _entry_d, acl_flagset_t *_flagset_p); 391int acl_get_permset(acl_entry_t _entry_d, acl_permset_t *_permset_p); 392int acl_get_tag_type(acl_entry_t _entry_d, acl_tag_t *_tag_type_p); 393acl_t acl_init(int _count); 394int acl_set_fd(int _fd, acl_t _acl); 395int acl_set_fd_np(int _fd, acl_t _acl, acl_type_t _type); 396int acl_set_file(const char *_path_p, acl_type_t _type, acl_t _acl); 397int acl_set_entry_type_np(acl_entry_t _entry_d, acl_entry_type_t _entry_type); 398int acl_set_link_np(const char *_path_p, acl_type_t _type, acl_t _acl); 399int acl_set_flagset_np(acl_entry_t _entry_d, acl_flagset_t _flagset_d); 400int acl_set_permset(acl_entry_t _entry_d, acl_permset_t _permset_d); 401int acl_set_qualifier(acl_entry_t _entry_d, const void *_tag_qualifier_p); 402int acl_set_tag_type(acl_entry_t _entry_d, acl_tag_t _tag_type); 403ssize_t acl_size(acl_t _acl); 404char *acl_to_text(acl_t _acl, ssize_t *_len_p); 405char *acl_to_text_np(acl_t _acl, ssize_t *_len_p, int _flags); 406int acl_valid(acl_t _acl); 407int acl_valid_fd_np(int _fd, acl_type_t _type, acl_t _acl); 408int acl_valid_file_np(const char *_path_p, acl_type_t _type, acl_t _acl); 409int acl_valid_link_np(const char *_path_p, acl_type_t _type, acl_t _acl); 410int acl_is_trivial_np(const acl_t _acl, int *_trivialp); 411acl_t acl_strip_np(const acl_t _acl, int recalculate_mask); 412__END_DECLS 413 414#endif /* !_KERNEL */ 415 416#endif /* !_SYS_ACL_H_ */ 417