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, char *path);
  33
  34 int
  35 kpersona_alloc(struct kpersona_info *info, uid_t *id)
  36 {
  37         size_t idlen = 1;
  38         return __persona(PERSONA_OP_ALLOC, 0, info, id, &idlen, NULL);
  39 }
  40
  41 int
  42 kpersona_palloc(struct kpersona_info *info, uid_t *id, char path[MAXPATHLEN])
  43 {
  44         size_t idlen = 1;
  45         return __persona(PERSONA_OP_PALLOC, 0, info, id, &idlen, path);
  46 }
  47
  48 int
  49 kpersona_dealloc(uid_t id)
  50 {
  51         size_t idlen = 1;
  52         return __persona(PERSONA_OP_DEALLOC, 0, NULL, &id, &idlen, NULL);
  53 }
  54
  55 int
  56 kpersona_get(uid_t *id)
  57 {
  58         /* persona is a process-static identifier: cache it in a global */
  59         static uid_t p_id = PERSONA_ID_NONE;
  60         if (p_id == PERSONA_ID_NONE) {
  61                 int ret = 0;
  62                 size_t idlen = 1;
  63                 ret = __persona(PERSONA_OP_GET, 0, NULL, &p_id, &idlen, NULL);
  64                 if (ret != 0) {
  65                         return ret;
  66                 }
  67         }
  68         *id = p_id;
  69         return 0;
  70 }
  71
  72 int
  73 kpersona_getpath(uid_t id, char path[MAXPATHLEN])
  74 {
  75         size_t idlen = 1;
  76         return __persona(PERSONA_OP_GETPATH, 0, NULL, &id, &idlen, path);
  77 }
  78
  79 int
  80 kpersona_info(uid_t id, struct kpersona_info *info)
  81 {
  82         size_t idlen = 1;
  83         return __persona(PERSONA_OP_INFO, 0, info, &id, &idlen, NULL);
  84 }
  85
  86 int
  87 kpersona_pidinfo(pid_t pid, struct kpersona_info *info)
  88 {
  89         size_t idlen = 1;
  90         uid_t id = (uid_t)pid;
  91         return __persona(PERSONA_OP_PIDINFO, 0, info, &id, &idlen, NULL);
  92 }
  93
  94 int
  95 kpersona_find(const char *name, uid_t uid, uid_t *id, size_t *idlen)
  96 {
  97         int ret;
  98         struct kpersona_info kinfo;
  99         kinfo.persona_info_version = PERSONA_INFO_V1;
 100         kinfo.persona_id = uid;
 101         kinfo.persona_type = 0;
 102         kinfo.persona_gid = 0;
 103         kinfo.persona_ngroups = 0;
 104         kinfo.persona_groups[0] = 0;
 105         kinfo.persona_name[0] = 0;
 106         if (name) {
 107                 strlcpy(kinfo.persona_name, name, sizeof(kinfo.persona_name));
 108         }
 109         ret = __persona(PERSONA_OP_FIND, 0, &kinfo, id, idlen, NULL);
 110         if (ret < 0) {
 111                 return ret;
 112         }
 113         return (int)(*idlen);
 114 }
 115
 116 int
 117 kpersona_find_by_type(int persona_type, uid_t *id, size_t *idlen)
 118 {
 119         int ret;
 120         struct kpersona_info kinfo;
 121         kinfo.persona_info_version = PERSONA_INFO_V1;
 122         kinfo.persona_type = persona_type;
 123         kinfo.persona_id = -1;
 124         kinfo.persona_gid = 0;
 125         kinfo.persona_ngroups = 0;
 126         kinfo.persona_groups[0] = 0;
 127         kinfo.persona_name[0] = 0;
 128         ret = __persona(PERSONA_OP_FIND_BY_TYPE, 0, &kinfo, id, idlen, NULL);
 129         if (ret < 0) {
 130                 return ret;
 131         }
 132         return (int)(*idlen);
 133 }