bsd/sys/kauth.h

   1 /*
   2  * Copyright (c) 2004-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  30  * support for mandatory and extensible security protections.  This notice
  31  * is included in support of clause 2.2 (b) of the Apple Public License,
  32  * Version 2.0.
  33  */
  34
  35 #ifndef _SYS_KAUTH_H
  36 #define _SYS_KAUTH_H
  37
  38 #include <sys/appleapiopts.h>
  39 #include <sys/cdefs.h>
  40 #include <mach/boolean.h>
  41 #include <sys/_types.h>         /* __offsetof() */
  42
  43 #ifdef __APPLE_API_EVOLVING
  44
  45 /*
  46  * Identities.
  47  */
  48
  49 #define KAUTH_UID_NONE  (~(uid_t)0 - 100)       /* not a valid UID */
  50 #define KAUTH_GID_NONE  (~(gid_t)0 - 100)       /* not a valid GID */
  51
  52 #ifndef _KAUTH_GUID
  53 #define _KAUTH_GUID
  54 /* Apple-style globally unique identifier */
  55 typedef struct {
  56 #define KAUTH_GUID_SIZE 16      /* 128-bit identifier */
  57         unsigned char g_guid[KAUTH_GUID_SIZE];
  58 } guid_t;
  59 #define _GUID_T
  60 #endif /* _KAUTH_GUID */
  61
  62 /* NT Security Identifier, structure as defined by Microsoft */
  63 #pragma pack(1)    /* push packing of 1 byte */
  64 typedef struct {
  65         u_int8_t                sid_kind;
  66         u_int8_t                sid_authcount;
  67         u_int8_t                sid_authority[6];
  68 #define KAUTH_NTSID_MAX_AUTHORITIES 16
  69         u_int32_t       sid_authorities[KAUTH_NTSID_MAX_AUTHORITIES];
  70 } ntsid_t;
  71 #pragma pack()    /* pop packing to previous packing level */
  72 #define _NTSID_T
  73
  74 /* valid byte count inside a SID structure */
  75 #define KAUTH_NTSID_HDRSIZE     (8)
  76 #define KAUTH_NTSID_SIZE(_s)    (KAUTH_NTSID_HDRSIZE + ((_s)->sid_authcount * sizeof(u_int32_t)))
  77
  78 /*
  79  * External lookup message payload; this structure is shared between the
  80  * kernel group membership resolver, and the user space group membership
  81  * resolver daemon, and is use to communicate resolution requests from the
  82  * kernel to user space, and the result of that request from user space to
  83  * the kernel.
  84  */
  85 struct kauth_identity_extlookup {
  86         u_int32_t       el_seqno;       /* request sequence number */
  87         u_int32_t       el_result;      /* lookup result */
  88 #define KAUTH_EXTLOOKUP_SUCCESS         0       /* results here are good */
  89 #define KAUTH_EXTLOOKUP_BADRQ           1       /* request badly formatted */
  90 #define KAUTH_EXTLOOKUP_FAILURE         2       /* transient failure during lookup */
  91 #define KAUTH_EXTLOOKUP_FATAL           3       /* permanent failure during lookup */
  92 #define KAUTH_EXTLOOKUP_INPROG          100     /* request in progress */
  93         u_int32_t       el_flags;
  94 #define KAUTH_EXTLOOKUP_VALID_UID       (1<<0)
  95 #define KAUTH_EXTLOOKUP_VALID_UGUID     (1<<1)
  96 #define KAUTH_EXTLOOKUP_VALID_USID      (1<<2)
  97 #define KAUTH_EXTLOOKUP_VALID_GID       (1<<3)
  98 #define KAUTH_EXTLOOKUP_VALID_GGUID     (1<<4)
  99 #define KAUTH_EXTLOOKUP_VALID_GSID      (1<<5)
 100 #define KAUTH_EXTLOOKUP_WANT_UID        (1<<6)
 101 #define KAUTH_EXTLOOKUP_WANT_UGUID      (1<<7)
 102 #define KAUTH_EXTLOOKUP_WANT_USID       (1<<8)
 103 #define KAUTH_EXTLOOKUP_WANT_GID        (1<<9)
 104 #define KAUTH_EXTLOOKUP_WANT_GGUID      (1<<10)
 105 #define KAUTH_EXTLOOKUP_WANT_GSID       (1<<11)
 106 #define KAUTH_EXTLOOKUP_WANT_MEMBERSHIP (1<<12)
 107 #define KAUTH_EXTLOOKUP_VALID_MEMBERSHIP (1<<13)
 108 #define KAUTH_EXTLOOKUP_ISMEMBER        (1<<14)
 109 #define KAUTH_EXTLOOKUP_VALID_PWNAM     (1<<15)
 110 #define KAUTH_EXTLOOKUP_WANT_PWNAM      (1<<16)
 111 #define KAUTH_EXTLOOKUP_VALID_GRNAM     (1<<17)
 112 #define KAUTH_EXTLOOKUP_WANT_GRNAM      (1<<18)
 113
 114         __darwin_pid_t  el_info_pid;            /* request on behalf of PID */
 115         u_int64_t       el_extend;              /* extension field */
 116         u_int32_t       el_info_reserved_1;     /* reserved (APPLE) */
 117
 118         uid_t           el_uid;         /* user ID */
 119         guid_t          el_uguid;       /* user GUID */
 120         u_int32_t       el_uguid_valid; /* TTL on translation result (seconds) */
 121         ntsid_t         el_usid;        /* user NT SID */
 122         u_int32_t       el_usid_valid;  /* TTL on translation result (seconds) */
 123         gid_t           el_gid;         /* group ID */
 124         guid_t          el_gguid;       /* group GUID */
 125         u_int32_t       el_gguid_valid; /* TTL on translation result (seconds) */
 126         ntsid_t         el_gsid;        /* group SID */
 127         u_int32_t       el_gsid_valid;  /* TTL on translation result (seconds) */
 128         u_int32_t       el_member_valid; /* TTL on group lookup result */
 129 };
 130
 131 struct kauth_cache_sizes {
 132         u_int32_t kcs_group_size;
 133         u_int32_t kcs_id_size;
 134 };
 135
 136 #define KAUTH_EXTLOOKUP_REGISTER        (0)
 137 #define KAUTH_EXTLOOKUP_RESULT          (1<<0)
 138 #define KAUTH_EXTLOOKUP_WORKER          (1<<1)
 139 #define KAUTH_EXTLOOKUP_DEREGISTER      (1<<2)
 140 #define KAUTH_GET_CACHE_SIZES           (1<<3)
 141 #define KAUTH_SET_CACHE_SIZES           (1<<4)
 142 #define KAUTH_CLEAR_CACHES              (1<<5)
 143
 144
 145 #ifdef KERNEL
 146 /*
 147  * Credentials.
 148  */
 149
 150 #if 0
 151 /*
 152  * Supplemental credential data.
 153  *
 154  * This interface allows us to associate arbitrary data with a credential.
 155  * As with the credential, the data is considered immutable.
 156  */
 157 struct kauth_cred_supplement {
 158         TAILQ_ENTRY(kauth_cred_supplement) kcs_link;
 159
 160         int     kcs_ref;                /* reference count */
 161         int     kcs_id;                 /* vended identifier */
 162         size_t  kcs_size;               /* size of data field */
 163         char    kcs_data[0];
 164 };
 165
 166 typedef struct kauth_cred_supplement *kauth_cred_supplement_t;
 167
 168 struct kauth_cred {
 169         TAILQ_ENTRY(kauth_cred) kc_link;
 170
 171         int     kc_ref;                 /* reference count */
 172         uid_t   kc_uid;                 /* effective user id */
 173         uid_t   kc_ruid;                /* real user id */
 174         uid_t   kc_svuid;               /* saved user id */
 175         gid_t   kc_gid;                 /* effective group id */
 176         gid_t   kc_rgid;                /* real group id */
 177         gid_t   kc_svgid;               /* saved group id */
 178
 179         int     kc_flags;
 180 #define KAUTH_CRED_GRPOVERRIDE          (1<<0)  /* private group list is authoritative */
 181
 182         int     kc_npvtgroups;          /* private group list, advisory or authoritative */
 183         gid_t   kc_pvtgroups[NGROUPS];  /* based on KAUTH_CRED_GRPOVERRIDE flag */
 184
 185         int     kc_nsuppgroups;         /* supplementary group list */
 186         gid_t   *kc_suppgroups;
 187
 188         int     kc_nwhtgroups;          /* whiteout group list */
 189         gid_t   *kc_whtgroups;
 190
 191         struct au_session cr_audit;     /* user auditing data */
 192
 193         int     kc_nsupplement;         /* entry count in supplemental data pointer array */
 194         kauth_cred_supplement_t *kc_supplement;
 195 };
 196 #else
 197
 198 /* XXX just for now */
 199 #include <sys/ucred.h>
 200 // typedef struct ucred *kauth_cred_t;
 201 #endif
 202
 203 /* Kernel SPI for now */
 204 __BEGIN_DECLS
 205 /*
 206  * Routines specific to credentials with POSIX credential labels attached
 207  *
 208  * XXX  Should be in policy_posix.h, with struct posix_cred
 209  */
 210 extern kauth_cred_t posix_cred_create(posix_cred_t pcred);
 211 extern posix_cred_t posix_cred_get(kauth_cred_t cred);
 212 extern void posix_cred_label(kauth_cred_t cred, posix_cred_t pcred);
 213 extern int posix_cred_access(kauth_cred_t cred, id_t object_uid, id_t object_gid, mode_t object_mode, mode_t mode_req);
 214
 215 extern uid_t    kauth_getuid(void);
 216 extern uid_t    kauth_getruid(void);
 217 extern gid_t    kauth_getgid(void);
 218 extern kauth_cred_t kauth_cred_get(void);
 219 extern kauth_cred_t kauth_cred_get_with_ref(void);
 220 extern kauth_cred_t kauth_cred_proc_ref(proc_t procp);
 221 extern kauth_cred_t kauth_cred_create(kauth_cred_t cred);
 222 extern void     kauth_cred_ref(kauth_cred_t _cred);
 223 #ifndef __LP64__
 224 /* Use kauth_cred_unref(), not kauth_cred_rele() */
 225 extern void     kauth_cred_rele(kauth_cred_t _cred) __deprecated;
 226 #endif
 227 extern void     kauth_cred_unref(kauth_cred_t *_cred);
 228
 229 #if CONFIG_MACF
 230 struct label;
 231 extern kauth_cred_t     kauth_cred_label_update(kauth_cred_t cred, struct label *label);
 232 extern int kauth_proc_label_update(struct proc *p, struct label *label);
 233 #else
 234 /* this is a temp hack to cover us when MAC is not built in a kernel configuration.
 235  * Since we cannot build our export list based on the kernel configuration we need
 236  * to define a stub.
 237  */
 238 extern kauth_cred_t     kauth_cred_label_update(kauth_cred_t cred, void *label);
 239 extern int kauth_proc_label_update(struct proc *p, void *label);
 240 #endif
 241
 242 extern kauth_cred_t kauth_cred_find(kauth_cred_t cred);
 243 extern uid_t    kauth_cred_getuid(kauth_cred_t _cred);
 244 extern uid_t    kauth_cred_getruid(kauth_cred_t _cred);
 245 extern uid_t    kauth_cred_getsvuid(kauth_cred_t _cred);
 246 extern gid_t    kauth_cred_getgid(kauth_cred_t _cred);
 247 extern gid_t    kauth_cred_getrgid(kauth_cred_t _cred);
 248 extern gid_t    kauth_cred_getsvgid(kauth_cred_t _cred);
 249 extern int      kauth_cred_pwnam2guid(char *pwnam, guid_t *guidp);
 250 extern int      kauth_cred_grnam2guid(char *grnam, guid_t *guidp);
 251 extern int      kauth_cred_guid2pwnam(guid_t *guidp, char *pwnam);
 252 extern int      kauth_cred_guid2grnam(guid_t *guidp, char *grnam);
 253 extern int      kauth_cred_guid2uid(guid_t *_guid, uid_t *_uidp);
 254 extern int      kauth_cred_guid2gid(guid_t *_guid, gid_t *_gidp);
 255 extern int      kauth_cred_ntsid2uid(ntsid_t *_sid, uid_t *_uidp);
 256 extern int      kauth_cred_ntsid2gid(ntsid_t *_sid, gid_t *_gidp);
 257 extern int      kauth_cred_ntsid2guid(ntsid_t *_sid, guid_t *_guidp);
 258 extern int      kauth_cred_uid2guid(uid_t _uid, guid_t *_guidp);
 259 extern int      kauth_cred_getguid(kauth_cred_t _cred, guid_t *_guidp);
 260 extern int      kauth_cred_gid2guid(gid_t _gid, guid_t *_guidp);
 261 extern int      kauth_cred_uid2ntsid(uid_t _uid, ntsid_t *_sidp);
 262 extern int      kauth_cred_getntsid(kauth_cred_t _cred, ntsid_t *_sidp);
 263 extern int      kauth_cred_gid2ntsid(gid_t _gid, ntsid_t *_sidp);
 264 extern int      kauth_cred_guid2ntsid(guid_t *_guid, ntsid_t *_sidp);
 265 extern int      kauth_cred_ismember_gid(kauth_cred_t _cred, gid_t _gid, int *_resultp);
 266 extern int      kauth_cred_ismember_guid(kauth_cred_t _cred, guid_t *_guidp, int *_resultp);
 267
 268 extern int      groupmember(gid_t gid, kauth_cred_t cred);
 269
 270 /* currently only exported in unsupported for use by seatbelt */
 271 extern int      kauth_cred_issuser(kauth_cred_t _cred);
 272
 273
 274 /* GUID, NTSID helpers */
 275 extern guid_t   kauth_null_guid;
 276 extern int      kauth_guid_equal(guid_t *_guid1, guid_t *_guid2);
 277 #ifdef XNU_KERNEL_PRIVATE
 278 extern int      kauth_ntsid_equal(ntsid_t *_sid1, ntsid_t *_sid2);
 279 #endif /* XNU_KERNEL_PRIVATE */
 280
 281 #ifdef XNU_KERNEL_PRIVATE
 282 extern int      kauth_wellknown_guid(guid_t *_guid);
 283 #define KAUTH_WKG_NOT           0       /* not a well-known GUID */
 284 #define KAUTH_WKG_OWNER         1
 285 #define KAUTH_WKG_GROUP         2
 286 #define KAUTH_WKG_NOBODY        3
 287 #define KAUTH_WKG_EVERYBODY     4
 288
 289 extern kauth_cred_t kauth_cred_dup(kauth_cred_t cred);
 290 extern gid_t    kauth_getrgid(void);
 291 extern kauth_cred_t kauth_cred_alloc(void);
 292 extern int      cantrace(proc_t cur_procp, kauth_cred_t creds, proc_t traced_procp, int *errp);
 293 extern kauth_cred_t kauth_cred_copy_real(kauth_cred_t cred);
 294 extern kauth_cred_t     kauth_cred_setresuid(kauth_cred_t cred, uid_t ruid, uid_t euid, uid_t svuid, uid_t gmuid);
 295 extern kauth_cred_t     kauth_cred_setresgid(kauth_cred_t cred, gid_t rgid, gid_t egid, gid_t svgid);
 296 extern kauth_cred_t kauth_cred_setuidgid(kauth_cred_t cred, uid_t uid, gid_t gid);
 297 extern kauth_cred_t kauth_cred_setsvuidgid(kauth_cred_t cred, uid_t uid, gid_t gid);
 298 extern kauth_cred_t     kauth_cred_setgroups(kauth_cred_t cred, gid_t *groups, int groupcount, uid_t gmuid);
 299 struct uthread;
 300 extern void     kauth_cred_uthread_update(struct uthread *, proc_t);
 301 #ifdef CONFIG_MACF
 302 extern int kauth_proc_label_update_execve(struct proc *p, struct vfs_context *ctx, struct vnode *vp, struct label *scriptlabel, struct label *execlabel);
 303 #endif
 304 extern int      kauth_cred_getgroups(kauth_cred_t _cred, gid_t *_groups, int *_groupcount);
 305 extern int      kauth_cred_assume(uid_t _uid);
 306 extern int      kauth_cred_gid_subset(kauth_cred_t _cred1, kauth_cred_t _cred2, int *_resultp);
 307 struct auditinfo_addr;
 308 extern kauth_cred_t kauth_cred_setauditinfo(kauth_cred_t, au_session_t *);
 309 extern int      kauth_cred_supplementary_register(const char *name, int *ident);
 310 extern int      kauth_cred_supplementary_add(kauth_cred_t cred, int ident, const void *data, size_t datasize);
 311 extern int      kauth_cred_supplementary_remove(kauth_cred_t cred, int ident);
 312
 313 #endif /* XNU_KERNEL_PRIVATE */
 314 __END_DECLS
 315
 316 #endif /* KERNEL */
 317
 318 /*
 319  * Generic Access Control Lists.
 320  */
 321 #if defined(KERNEL) || defined (_SYS_ACL_H)
 322
 323 typedef u_int32_t kauth_ace_rights_t;
 324
 325 /* Access Control List Entry (ACE) */
 326 struct kauth_ace {
 327         guid_t          ace_applicable;
 328         u_int32_t       ace_flags;
 329 #define KAUTH_ACE_KINDMASK              0xf
 330 #define KAUTH_ACE_PERMIT                1
 331 #define KAUTH_ACE_DENY                  2
 332 #define KAUTH_ACE_AUDIT                 3       /* not implemented */
 333 #define KAUTH_ACE_ALARM                 4       /* not implemented */
 334 #define KAUTH_ACE_INHERITED             (1<<4)
 335 #define KAUTH_ACE_FILE_INHERIT          (1<<5)
 336 #define KAUTH_ACE_DIRECTORY_INHERIT     (1<<6)
 337 #define KAUTH_ACE_LIMIT_INHERIT         (1<<7)
 338 #define KAUTH_ACE_ONLY_INHERIT          (1<<8)
 339 #define KAUTH_ACE_SUCCESS               (1<<9)  /* not implemented (AUDIT/ALARM) */
 340 #define KAUTH_ACE_FAILURE               (1<<10) /* not implemented (AUDIT/ALARM) */
 341 /* All flag bits controlling ACE inheritance */
 342 #define KAUTH_ACE_INHERIT_CONTROL_FLAGS         \
 343                 (KAUTH_ACE_FILE_INHERIT |       \
 344                  KAUTH_ACE_DIRECTORY_INHERIT |  \
 345                  KAUTH_ACE_LIMIT_INHERIT |      \
 346                  KAUTH_ACE_ONLY_INHERIT)
 347         kauth_ace_rights_t ace_rights;          /* scope specific */
 348         /* These rights are never tested, but may be present in an ACL */
 349 #define KAUTH_ACE_GENERIC_ALL           (1<<21)
 350 #define KAUTH_ACE_GENERIC_EXECUTE       (1<<22)
 351 #define KAUTH_ACE_GENERIC_WRITE         (1<<23)
 352 #define KAUTH_ACE_GENERIC_READ          (1<<24)
 353
 354 };
 355
 356 #ifndef _KAUTH_ACE
 357 #define _KAUTH_ACE
 358 typedef struct kauth_ace *kauth_ace_t;
 359 #endif
 360
 361
 362 /* Access Control List */
 363 struct kauth_acl {
 364         u_int32_t       acl_entrycount;
 365         u_int32_t       acl_flags;
 366
 367         struct kauth_ace acl_ace[1];
 368 };
 369
 370 /*
 371  * XXX this value needs to be raised - 3893388
 372  */
 373 #define KAUTH_ACL_MAX_ENTRIES           128
 374
 375 /*
 376  * The low 16 bits of the flags field are reserved for filesystem
 377  * internal use and must be preserved by all APIs.  This includes
 378  * round-tripping flags through user-space interfaces.
 379  */
 380 #define KAUTH_ACL_FLAGS_PRIVATE (0xffff)
 381
 382 /*
 383  * The high 16 bits of the flags are used to store attributes and
 384  * to request specific handling of the ACL.
 385  */
 386
 387 /* inheritance will be deferred until the first rename operation */
 388 #define KAUTH_ACL_DEFER_INHERIT (1<<16)
 389 /* this ACL must not be overwritten as part of an inheritance operation */
 390 #define KAUTH_ACL_NO_INHERIT    (1<<17)
 391
 392 /* acl_entrycount that tells us the ACL is not valid */
 393 #define KAUTH_FILESEC_NOACL ((u_int32_t)(-1))
 394
 395 /*
 396  * If the acl_entrycount field is KAUTH_FILESEC_NOACL, then the size is the
 397  * same as a kauth_acl structure; the intent is to put an actual entrycount of
 398  * KAUTH_FILESEC_NOACL on disk to distinguish a kauth_filesec_t with an empty
 399  * entry (Windows treats this as "deny all") from one that merely indicates a
 400  * file group and/or owner guid values.
 401  */
 402 #define KAUTH_ACL_SIZE(c)       (__offsetof(struct kauth_acl, acl_ace) + ((u_int32_t)(c) != KAUTH_FILESEC_NOACL ? ((c) * sizeof(struct kauth_ace)) : 0))
 403 #define KAUTH_ACL_COPYSIZE(p)   KAUTH_ACL_SIZE((p)->acl_entrycount)
 404
 405
 406 #ifndef _KAUTH_ACL
 407 #define _KAUTH_ACL
 408 typedef struct kauth_acl *kauth_acl_t;
 409 #endif
 410
 411 #ifdef KERNEL
 412 __BEGIN_DECLS
 413 kauth_acl_t     kauth_acl_alloc(int size);
 414 void            kauth_acl_free(kauth_acl_t fsp);
 415 __END_DECLS
 416 #endif
 417
 418
 419 /*
 420  * Extended File Security.
 421  */
 422
 423 /* File Security information */
 424 struct kauth_filesec {
 425         u_int32_t       fsec_magic;
 426 #define KAUTH_FILESEC_MAGIC     0x012cc16d
 427         guid_t          fsec_owner;
 428         guid_t          fsec_group;
 429
 430         struct kauth_acl fsec_acl;
 431 };
 432
 433 /* backwards compatibility */
 434 #define fsec_entrycount fsec_acl.acl_entrycount
 435 #define fsec_flags      fsec_acl.acl_flags
 436 #define fsec_ace        fsec_acl.acl_ace
 437 #define KAUTH_FILESEC_FLAGS_PRIVATE     KAUTH_ACL_FLAGS_PRIVATE
 438 #define KAUTH_FILESEC_DEFER_INHERIT     KAUTH_ACL_DEFER_INHERIT
 439 #define KAUTH_FILESEC_NO_INHERIT        KAUTH_ACL_NO_INHERIT
 440 #define KAUTH_FILESEC_NONE      ((kauth_filesec_t)0)
 441 #define KAUTH_FILESEC_WANTED    ((kauth_filesec_t)1)
 442
 443 #ifndef _KAUTH_FILESEC
 444 #define _KAUTH_FILESEC
 445 typedef struct kauth_filesec *kauth_filesec_t;
 446 #endif
 447
 448 #define KAUTH_FILESEC_SIZE(c)           (__offsetof(struct kauth_filesec, fsec_acl) + __offsetof(struct kauth_acl, acl_ace) + (c) * sizeof(struct kauth_ace))
 449 #define KAUTH_FILESEC_COPYSIZE(p)       KAUTH_FILESEC_SIZE(((p)->fsec_entrycount == KAUTH_FILESEC_NOACL) ? 0 : (p)->fsec_entrycount)
 450 #define KAUTH_FILESEC_COUNT(s)          (((s)  - KAUTH_FILESEC_SIZE(0)) / sizeof(struct kauth_ace))
 451 #define KAUTH_FILESEC_VALID(s)          ((s) >= KAUTH_FILESEC_SIZE(0) && (((s) - KAUTH_FILESEC_SIZE(0)) % sizeof(struct kauth_ace)) == 0)
 452
 453 #define KAUTH_FILESEC_XATTR     "com.apple.system.Security"
 454
 455 /* Allowable first arguments to kauth_filesec_acl_setendian() */
 456 #define KAUTH_ENDIAN_HOST       0x00000001      /* set host endianness */
 457 #define KAUTH_ENDIAN_DISK       0x00000002      /* set disk endianness */
 458
 459 #endif /* KERNEL || <sys/acl.h> */
 460
 461
 462 #ifdef KERNEL
 463
 464
 465 /*
 466  * Scope management.
 467  */
 468 struct kauth_scope;
 469 typedef struct kauth_scope *kauth_scope_t;
 470 struct kauth_listener;
 471 typedef struct kauth_listener *kauth_listener_t;
 472 #ifndef _KAUTH_ACTION_T
 473 typedef int kauth_action_t;
 474 # define _KAUTH_ACTION_T
 475 #endif
 476
 477 typedef int (* kauth_scope_callback_t)(kauth_cred_t _credential,
 478                                 void *_idata,
 479                                 kauth_action_t _action,
 480                                 uintptr_t _arg0,
 481                                 uintptr_t _arg1,
 482                                 uintptr_t _arg2,
 483                                 uintptr_t _arg3);
 484
 485 #define KAUTH_RESULT_ALLOW      (1)
 486 #define KAUTH_RESULT_DENY       (2)
 487 #define KAUTH_RESULT_DEFER      (3)
 488
 489 struct kauth_acl_eval {
 490         kauth_ace_t             ae_acl;
 491         int                     ae_count;
 492         kauth_ace_rights_t      ae_requested;
 493         kauth_ace_rights_t      ae_residual;
 494         int                     ae_result;
 495         boolean_t               ae_found_deny;
 496         int                     ae_options;
 497 #define KAUTH_AEVAL_IS_OWNER    (1<<0)          /* authorizing operation for owner */
 498 #define KAUTH_AEVAL_IN_GROUP    (1<<1)          /* authorizing operation for groupmember */
 499 #define KAUTH_AEVAL_IN_GROUP_UNKNOWN    (1<<2)          /* authorizing operation for unknown group membership */
 500         /* expansions for 'generic' rights bits */
 501         kauth_ace_rights_t      ae_exp_gall;
 502         kauth_ace_rights_t      ae_exp_gread;
 503         kauth_ace_rights_t      ae_exp_gwrite;
 504         kauth_ace_rights_t      ae_exp_gexec;
 505 };
 506
 507 typedef struct kauth_acl_eval *kauth_acl_eval_t;
 508
 509 __BEGIN_DECLS
 510 kauth_filesec_t kauth_filesec_alloc(int size);
 511 void            kauth_filesec_free(kauth_filesec_t fsp);
 512 extern kauth_scope_t kauth_register_scope(const char *_identifier, kauth_scope_callback_t _callback, void *_idata);
 513 extern void     kauth_deregister_scope(kauth_scope_t _scope);
 514 extern kauth_listener_t kauth_listen_scope(const char *_identifier, kauth_scope_callback_t _callback, void *_idata);
 515 extern void     kauth_unlisten_scope(kauth_listener_t _scope);
 516 extern int      kauth_authorize_action(kauth_scope_t _scope, kauth_cred_t _credential, kauth_action_t _action,
 517                         uintptr_t _arg0, uintptr_t _arg1, uintptr_t _arg2, uintptr_t _arg3);
 518
 519 /* default scope handlers */
 520 extern int      kauth_authorize_allow(kauth_cred_t _credential, void *_idata, kauth_action_t _action,
 521     uintptr_t _arg0, uintptr_t _arg1, uintptr_t _arg2, uintptr_t _arg3);
 522
 523
 524 #ifdef XNU_KERNEL_PRIVATE
 525 void            kauth_filesec_acl_setendian(int, kauth_filesec_t, kauth_acl_t);
 526 int             kauth_copyinfilesec(user_addr_t xsecurity, kauth_filesec_t *xsecdestpp);
 527 extern int      kauth_acl_evaluate(kauth_cred_t _credential, kauth_acl_eval_t _eval);
 528 extern int      kauth_acl_inherit(vnode_t _dvp, kauth_acl_t _initial, kauth_acl_t *_product, int _isdir, vfs_context_t _ctx);
 529
 530 #endif /* XNU_KERNEL_PRIVATE */
 531
 532
 533 __END_DECLS
 534
 535 /*
 536  * Generic scope.
 537  */
 538 #define KAUTH_SCOPE_GENERIC     "com.apple.kauth.generic"
 539
 540 /* Actions */
 541 #define KAUTH_GENERIC_ISSUSER                   1
 542
 543 #ifdef XNU_KERNEL_PRIVATE
 544 __BEGIN_DECLS
 545 extern int      kauth_authorize_generic(kauth_cred_t credential, kauth_action_t action);
 546 __END_DECLS
 547 #endif /* XNU_KERNEL_PRIVATE */
 548
 549 /*
 550  * Process/task scope.
 551  */
 552 #define KAUTH_SCOPE_PROCESS     "com.apple.kauth.process"
 553
 554 /* Actions */
 555 #define KAUTH_PROCESS_CANSIGNAL                 1
 556 #define KAUTH_PROCESS_CANTRACE                  2
 557
 558 __BEGIN_DECLS
 559 extern int      kauth_authorize_process(kauth_cred_t _credential, kauth_action_t _action,
 560     struct proc *_process, uintptr_t _arg1, uintptr_t _arg2, uintptr_t _arg3);
 561 __END_DECLS
 562
 563 /*
 564  * Vnode operation scope.
 565  *
 566  * Prototype for vnode_authorize is in vnode.h
 567  */
 568 #define KAUTH_SCOPE_VNODE       "com.apple.kauth.vnode"
 569
 570 /*
 571  * File system operation scope.
 572  *
 573  */
 574 #define KAUTH_SCOPE_FILEOP      "com.apple.kauth.fileop"
 575
 576 /* Actions */
 577 #define KAUTH_FILEOP_OPEN                       1
 578 #define KAUTH_FILEOP_CLOSE                      2
 579 #define KAUTH_FILEOP_RENAME                     3
 580 #define KAUTH_FILEOP_EXCHANGE                   4
 581 #define KAUTH_FILEOP_LINK                       5
 582 #define KAUTH_FILEOP_EXEC                       6
 583 #define KAUTH_FILEOP_DELETE                     7
 584
 585 /*
 586  * arguments passed to KAUTH_FILEOP_OPEN listeners
 587  *              arg0 is pointer to vnode (vnode *) for given user path.
 588  *              arg1 is pointer to path (char *) passed in to open.
 589  * arguments passed to KAUTH_FILEOP_CLOSE listeners
 590  *              arg0 is pointer to vnode (vnode *) for file to be closed.
 591  *              arg1 is pointer to path (char *) of file to be closed.
 592  *              arg2 is close flags.
 593  * arguments passed to KAUTH_FILEOP_RENAME listeners
 594  *              arg0 is pointer to "from" path (char *).
 595  *              arg1 is pointer to "to" path (char *).
 596  * arguments passed to KAUTH_FILEOP_EXCHANGE listeners
 597  *              arg0 is pointer to file 1 path (char *).
 598  *              arg1 is pointer to file 2 path (char *).
 599  * arguments passed to KAUTH_FILEOP_LINK listeners
 600  *              arg0 is pointer to path to file we are linking to (char *).
 601  *              arg1 is pointer to path to the new link file (char *).
 602  * arguments passed to KAUTH_FILEOP_EXEC listeners
 603  *              arg0 is pointer to vnode (vnode *) for executable.
 604  *              arg1 is pointer to path (char *) to executable.
 605  * arguments passed to KAUTH_FILEOP_DELETE listeners
 606  *              arg0 is pointer to vnode (vnode *) of file/dir that was deleted.
 607  *              arg1 is pointer to path (char *) of file/dir that was deleted.
 608  */
 609
 610 /* Flag values returned to close listeners. */
 611 #define KAUTH_FILEOP_CLOSE_MODIFIED                     (1<<1)
 612
 613 __BEGIN_DECLS
 614 #ifdef XNU_KERNEL_PRIVATE
 615 extern int      kauth_authorize_fileop_has_listeners(void);
 616 #endif /* XNU_KERNEL_PRIVATE */
 617 extern int      kauth_authorize_fileop(kauth_cred_t _credential, kauth_action_t _action,
 618     uintptr_t _arg0, uintptr_t _arg1);
 619 __END_DECLS
 620
 621 #endif /* KERNEL */
 622
 623 /* Actions, also rights bits in an ACE */
 624
 625 #if defined(KERNEL) || defined (_SYS_ACL_H)
 626 #define KAUTH_VNODE_READ_DATA                   (1<<1)
 627 #define KAUTH_VNODE_LIST_DIRECTORY              KAUTH_VNODE_READ_DATA
 628 #define KAUTH_VNODE_WRITE_DATA                  (1<<2)
 629 #define KAUTH_VNODE_ADD_FILE                    KAUTH_VNODE_WRITE_DATA
 630 #define KAUTH_VNODE_EXECUTE                     (1<<3)
 631 #define KAUTH_VNODE_SEARCH                      KAUTH_VNODE_EXECUTE
 632 #define KAUTH_VNODE_DELETE                      (1<<4)
 633 #define KAUTH_VNODE_APPEND_DATA                 (1<<5)
 634 #define KAUTH_VNODE_ADD_SUBDIRECTORY            KAUTH_VNODE_APPEND_DATA
 635 #define KAUTH_VNODE_DELETE_CHILD                (1<<6)
 636 #define KAUTH_VNODE_READ_ATTRIBUTES             (1<<7)
 637 #define KAUTH_VNODE_WRITE_ATTRIBUTES            (1<<8)
 638 #define KAUTH_VNODE_READ_EXTATTRIBUTES          (1<<9)
 639 #define KAUTH_VNODE_WRITE_EXTATTRIBUTES         (1<<10)
 640 #define KAUTH_VNODE_READ_SECURITY               (1<<11)
 641 #define KAUTH_VNODE_WRITE_SECURITY              (1<<12)
 642 #define KAUTH_VNODE_TAKE_OWNERSHIP              (1<<13)
 643
 644 /* backwards compatibility only */
 645 #define KAUTH_VNODE_CHANGE_OWNER                KAUTH_VNODE_TAKE_OWNERSHIP
 646
 647 /* For Windows interoperability only */
 648 #define KAUTH_VNODE_SYNCHRONIZE                 (1<<20)
 649
 650 /* (1<<21) - (1<<24) are reserved for generic rights bits */
 651
 652 /* Actions not expressed as rights bits */
 653 /*
 654  * Authorizes the vnode as the target of a hard link.
 655  */
 656 #define KAUTH_VNODE_LINKTARGET                  (1<<25)
 657
 658 /*
 659  * Indicates that other steps have been taken to authorise the action,
 660  * but authorisation should be denied for immutable objects.
 661  */
 662 #define KAUTH_VNODE_CHECKIMMUTABLE              (1<<26)
 663
 664 /* Action modifiers */
 665 /*
 666  * The KAUTH_VNODE_ACCESS bit is passed to the callback if the authorisation
 667  * request in progress is advisory, rather than authoritative.  Listeners
 668  * performing consequential work (i.e. not strictly checking authorisation)
 669  * may test this flag to avoid performing unnecessary work.
 670  *
 671  * This bit will never be present in an ACE.
 672  */
 673 #define KAUTH_VNODE_ACCESS                      (1<<31)
 674
 675 /*
 676  * The KAUTH_VNODE_NOIMMUTABLE bit is passed to the callback along with the
 677  * KAUTH_VNODE_WRITE_SECURITY bit (and no others) to indicate that the
 678  * caller wishes to change one or more of the immutable flags, and the
 679  * state of these flags should not be considered when authorizing the request.
 680  * The system immutable flags are only ignored when the system securelevel
 681  * is low enough to allow their removal.
 682  */
 683 #define KAUTH_VNODE_NOIMMUTABLE                 (1<<30)
 684
 685
 686 /*
 687  * fake right that is composed by the following...
 688  * vnode must have search for owner, group and world allowed
 689  * plus there must be no deny modes present for SEARCH... this fake
 690  * right is used by the fast lookup path to avoid checking
 691  * for an exact match on the last credential to lookup
 692  * the component being acted on
 693  */
 694 #define KAUTH_VNODE_SEARCHBYANYONE              (1<<29)
 695
 696
 697 /*
 698  * when passed as an 'action' to "vnode_uncache_authorized_actions"
 699  * it indicates that all of the cached authorizations for that
 700  * vnode should be invalidated
 701  */
 702 #define KAUTH_INVALIDATE_CACHED_RIGHTS          ((kauth_action_t)~0)
 703
 704
 705
 706 /* The expansions of the GENERIC bits at evaluation time */
 707 #define KAUTH_VNODE_GENERIC_READ_BITS   (KAUTH_VNODE_READ_DATA |                \
 708                                         KAUTH_VNODE_READ_ATTRIBUTES |           \
 709                                         KAUTH_VNODE_READ_EXTATTRIBUTES |        \
 710                                         KAUTH_VNODE_READ_SECURITY)
 711
 712 #define KAUTH_VNODE_GENERIC_WRITE_BITS  (KAUTH_VNODE_WRITE_DATA |               \
 713                                         KAUTH_VNODE_APPEND_DATA |               \
 714                                         KAUTH_VNODE_DELETE |                    \
 715                                         KAUTH_VNODE_DELETE_CHILD |              \
 716                                         KAUTH_VNODE_WRITE_ATTRIBUTES |          \
 717                                         KAUTH_VNODE_WRITE_EXTATTRIBUTES |       \
 718                                         KAUTH_VNODE_WRITE_SECURITY)
 719
 720 #define KAUTH_VNODE_GENERIC_EXECUTE_BITS (KAUTH_VNODE_EXECUTE)
 721
 722 #define KAUTH_VNODE_GENERIC_ALL_BITS    (KAUTH_VNODE_GENERIC_READ_BITS |        \
 723                                         KAUTH_VNODE_GENERIC_WRITE_BITS |        \
 724                                         KAUTH_VNODE_GENERIC_EXECUTE_BITS)
 725
 726 /*
 727  * Some sets of bits, defined here for convenience.
 728  */
 729 #define KAUTH_VNODE_WRITE_RIGHTS        (KAUTH_VNODE_ADD_FILE |                         \
 730                                         KAUTH_VNODE_ADD_SUBDIRECTORY |                  \
 731                                         KAUTH_VNODE_DELETE_CHILD |                      \
 732                                         KAUTH_VNODE_WRITE_DATA |                        \
 733                                         KAUTH_VNODE_APPEND_DATA |                       \
 734                                         KAUTH_VNODE_DELETE |                            \
 735                                         KAUTH_VNODE_WRITE_ATTRIBUTES |                  \
 736                                         KAUTH_VNODE_WRITE_EXTATTRIBUTES |               \
 737                                         KAUTH_VNODE_WRITE_SECURITY |                    \
 738                                         KAUTH_VNODE_TAKE_OWNERSHIP |                    \
 739                                         KAUTH_VNODE_LINKTARGET |                        \
 740                                         KAUTH_VNODE_CHECKIMMUTABLE)
 741
 742
 743 #endif /* KERNEL || <sys/acl.h> */
 744
 745 #ifdef KERNEL
 746 #include <sys/lock.h>   /* lck_grp_t */
 747
 748 /*
 749  * Debugging
 750  *
 751  * XXX this wouldn't be necessary if we had a *real* debug-logging system.
 752  */
 753 #if 0
 754 # ifndef _FN_KPRINTF
 755 #  define       _FN_KPRINTF
 756 void kprintf(const char *fmt, ...);
 757 # endif /* !_FN_KPRINTF */
 758 # define KAUTH_DEBUG_ENABLE
 759 # define K_UUID_FMT "%08x:%08x:%08x:%08x"
 760 # define K_UUID_ARG(_u) *(int *)&_u.g_guid[0],*(int *)&_u.g_guid[4],*(int *)&_u.g_guid[8],*(int *)&_u.g_guid[12]
 761 # define KAUTH_DEBUG(fmt, args...)      do { kprintf("%s:%d: " fmt "\n", __PRETTY_FUNCTION__, __LINE__ , ##args); } while (0)
 762 # define KAUTH_DEBUG_CTX(_c)            KAUTH_DEBUG("p = %p c = %p", _c->vc_proc, _c->vc_ucred)
 763 # define VFS_DEBUG(_ctx, _vp, fmt, args...)                                             \
 764         do {                                                                            \
 765                 kprintf("%p '%s' %s:%d " fmt "\n",                                      \
 766                     _ctx,                                                               \
 767                     (_vp != NULL && _vp->v_name != NULL) ? _vp->v_name : "????",        \
 768                     __PRETTY_FUNCTION__, __LINE__ ,                                     \
 769                     ##args);                                                            \
 770         } while(0)
 771 #else   /* !0 */
 772 # define KAUTH_DEBUG(fmt, args...)              do { } while (0)
 773 # define VFS_DEBUG(ctx, vp, fmt, args...)       do { } while(0)
 774 #endif  /* !0 */
 775
 776 /*
 777  * Initialisation.
 778  */
 779 extern lck_grp_t *kauth_lck_grp;
 780 #ifdef XNU_KERNEL_PRIVATE
 781 __BEGIN_DECLS
 782 extern void     kauth_init(void) __attribute__((section("__TEXT, initcode")));
 783 extern void     kauth_cred_init(void) __attribute__((section("__TEXT, initcode")));
 784 #if CONFIG_EXT_RESOLVER
 785 extern void     kauth_identity_init(void) __attribute__((section("__TEXT, initcode")));
 786 extern void     kauth_groups_init(void) __attribute__((section("__TEXT, initcode")));
 787 extern void     kauth_resolver_init(void) __attribute__((section("__TEXT, initcode")));
 788 #endif
 789 __END_DECLS
 790 #endif /* XNU_KERNEL_PRIVATE */
 791
 792 #endif  /* KERNEL */
 793
 794 #endif /* __APPLE_API_EVOLVING */
 795 #endif /* _SYS_KAUTH_H */