libsyscall/wrappers/persona.c

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #include <sys/cdefs.h>
  24 #include <sys/types.h>
  25 #include <stdarg.h>
  26 #include <stdint.h>
  27 #include <sys/persona.h>
  28
  29 #include "strings.h"
  30
  31 /* syscall entry point */
  32 int __persona(uint32_t operation, uint32_t flags, struct kpersona_info *info, uid_t *id, size_t *idlen);
  33
  34 int kpersona_alloc(struct kpersona_info *info, uid_t *id)
  35 {
  36         size_t idlen = 1;
  37         return __persona(PERSONA_OP_ALLOC, 0, info, id, &idlen);
  38 }
  39
  40 int kpersona_dealloc(uid_t id)
  41 {
  42         size_t idlen = 1;
  43         return __persona(PERSONA_OP_DEALLOC, 0, NULL, &id, &idlen);
  44 }
  45
  46 int kpersona_get(uid_t *id)
  47 {
  48         /* persona is a process-static identifier: cache it in a global */
  49         static uid_t p_id = PERSONA_ID_NONE;
  50         if (p_id == PERSONA_ID_NONE) {
  51                 int ret = 0;
  52                 size_t idlen = 1;
  53                 ret = __persona(PERSONA_OP_GET, 0, NULL, &p_id, &idlen);
  54                 if (ret != 0)
  55                         return ret;
  56         }
  57         *id = p_id;
  58         return 0;
  59 }
  60
  61 int kpersona_info(uid_t id, struct kpersona_info *info)
  62 {
  63         size_t idlen = 1;
  64         return __persona(PERSONA_OP_INFO, 0, info, &id, &idlen);
  65 }
  66
  67 int kpersona_pidinfo(pid_t pid, struct kpersona_info *info)
  68 {
  69         size_t idlen = 1;
  70         uid_t id = (uid_t)pid;
  71         return __persona(PERSONA_OP_PIDINFO, 0, info, &id, &idlen);
  72 }
  73
  74 int kpersona_find(const char *name, uid_t uid, uid_t *id, size_t *idlen)
  75 {
  76         int ret;
  77         struct kpersona_info kinfo;
  78         kinfo.persona_info_version = PERSONA_INFO_V1;
  79         kinfo.persona_id = uid;
  80         kinfo.persona_type = 0;
  81         kinfo.persona_gid = 0;
  82         kinfo.persona_ngroups = 0;
  83         kinfo.persona_groups[0] = 0;
  84         kinfo.persona_name[0] = 0;
  85         if (name)
  86                 strlcpy(kinfo.persona_name, name, sizeof(kinfo.persona_name));
  87         ret = __persona(PERSONA_OP_FIND, 0, &kinfo, id, idlen);
  88         if (ret < 0)
  89                 return ret;
  90         return (int)(*idlen);
  91 }