bsd/crypto/entropy/diag_entropy_sysctl.c

   1 /*
   2  * Copyright (c) 2019 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 #include <sys/sysctl.h>
  30 #include <crypto/entropy/diag_entropy_sysctl.h>
  31 #include <prng/entropy.h>
  32
  33 extern entropy_data_t EntropyData;
  34
  35 static int
  36 sysctl_entropy_collect(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
  37 {
  38         if (!req->oldptr || req->oldlen > EntropyData.buffer_size) {
  39                 return EINVAL;
  40         }
  41         return SYSCTL_OUT(req, EntropyData.buffer, req->oldlen);
  42 }
  43
  44 SYSCTL_NODE(_kern, OID_AUTO, entropy, CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_NOAUTO, 0, NULL);
  45 // Get current size of entropy buffer in bytes
  46 SYSCTL_UINT(_kern_entropy, OID_AUTO, entropy_buffer_size, CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_NOAUTO, &EntropyData.buffer_size, 0, NULL);
  47 // Collect contents from entropy buffer
  48 SYSCTL_PROC(_kern_entropy, OID_AUTO, entropy_collect, CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_NOAUTO, NULL, 0, sysctl_entropy_collect, "-", NULL);
  49
  50 void
  51 register_entropy_sysctl(void)
  52 {
  53         sysctl_register_oid(&sysctl__kern_entropy);
  54         sysctl_register_oid(&sysctl__kern_entropy_entropy_buffer_size);
  55         sysctl_register_oid(&sysctl__kern_entropy_entropy_collect);
  56 }