crypto/rand/rand_vms.c

   1 /*
   2  * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "e_os.h"
  11
  12 #if defined(OPENSSL_SYS_VMS)
  13 # include "internal/cryptlib.h"
  14 # include <openssl/rand.h>
  15 # include "internal/rand_int.h"
  16 # include "rand_lcl.h"
  17 # include <descrip.h>
  18 # include <jpidef.h>
  19 # include <ssdef.h>
  20 # include <starlet.h>
  21 # include <efndef>
  22 # ifdef __DECC
  23 #  pragma message disable DOLLARID
  24 # endif
  25
  26 # ifndef OPENSSL_RAND_SEED_OS
  27 #  error "Unsupported seeding method configured; must be os"
  28 # endif
  29
  30 /*
  31  * Use 32-bit pointers almost everywhere.  Define the type to which to cast a
  32  * pointer passed to an external function.
  33  */
  34 # if __INITIAL_POINTER_SIZE == 64
  35 #  define PTR_T __void_ptr64
  36 #  pragma pointer_size save
  37 #  pragma pointer_size 32
  38 # else
  39 #  define PTR_T void *
  40 # endif
  41
  42 static struct items_data_st {
  43     short length, code;         /* length is number of bytes */
  44 } items_data[] = {
  45     {4, JPI$_BUFIO},
  46     {4, JPI$_CPUTIM},
  47     {4, JPI$_DIRIO},
  48     {4, JPI$_IMAGECOUNT},
  49     {8, JPI$_LAST_LOGIN_I},
  50     {8, JPI$_LOGINTIM},
  51     {4, JPI$_PAGEFLTS},
  52     {4, JPI$_PID},
  53     {4, JPI$_PPGCNT},
  54     {4, JPI$_WSPEAK},
  55     {4, JPI$_FINALEXC},
  56     {0, 0}
  57 };
  58
  59 /*
  60  * We assume there we get about 4 bits of entropy per byte from the items
  61  * above, with a bit of scrambling added rand_pool_acquire_entropy()
  62  */
  63 #define ENTROPY_BITS_PER_BYTE   4
  64
  65 size_t rand_pool_acquire_entropy(RAND_POOL *pool)
  66 {
  67     /* determine the number of items in the JPI array */
  68     struct items_data_st item_entry;
  69     size_t item_entry_count = OSSL_NELEM(items_data);
  70     /* Create the 32-bit JPI itemlist array to hold item_data content */
  71     struct {
  72         uint16_t length, code;
  73         uint32_t *buffer;
  74         uint32_t *retlen;
  75     } item[item_entry_count], *pitem;
  76     struct items_data_st *pitems_data;
  77     /* 8 bytes (two longs) per entry max */
  78     uint32_t data_buffer[(item_entry_count * 2) + 4];
  79     uint32_t iosb[2];
  80     uint32_t sys_time[2];
  81     uint32_t *ptr;
  82     size_t i, j ;
  83     size_t tmp_length   = 0;
  84     size_t total_length = 0;
  85     size_t bytes_needed = rand_pool_bytes_needed(pool, ENTROPY_BITS_PER_BYTE);
  86     size_t bytes_remaining = rand_pool_bytes_remaining(pool);
  87
  88     /* Setup itemlist for GETJPI */
  89     pitems_data = items_data;
  90     for (pitem = item; pitems_data->length != 0; pitem++) {
  91         pitem->length = pitems_data->length;
  92         pitem->code   = pitems_data->code;
  93         pitem->buffer = &data_buffer[total_length];
  94         pitem->retlen = 0;
  95         /* total_length is in longwords */
  96         total_length += pitems_data->length / 4;
  97         pitems_data++;
  98     }
  99     pitem->length = pitem->code = 0;
 100
 101     /* Fill data_buffer with various info bits from this process */
 102     if (sys$getjpiw(EFN$C_ENF, NULL, NULL, item, &iosb, 0, 0) != SS$_NORMAL)
 103         return 0;
 104
 105     /* Now twist that data to seed the SSL random number init */
 106     for (i = 0; i < total_length; i++) {
 107         sys$gettim((struct _generic_64 *)&sys_time[0]);
 108         srand(sys_time[0] * data_buffer[0] * data_buffer[1] + i);
 109
 110         if (i == (total_length - 1)) { /* for JPI$_FINALEXC */
 111             ptr = &data_buffer[i];
 112             for (j = 0; j < 4; j++) {
 113                 data_buffer[i + j] = ptr[j];
 114                 /* OK to use rand() just to scramble the seed */
 115                 data_buffer[i + j] ^= (sys_time[0] ^ rand());
 116                 tmp_length++;
 117             }
 118         } else {
 119             /* OK to use rand() just to scramble the seed */
 120             data_buffer[i] ^= (sys_time[0] ^ rand());
 121         }
 122     }
 123
 124     total_length += (tmp_length - 1);
 125
 126     /* Change the total length to number of bytes */
 127     total_length *= 4;
 128
 129     /*
 130      * If we can't feed the requirements from the caller, we're in deep trouble.
 131      */
 132     if (!ossl_assert(total_length >= bytes_needed)) {
 133         char neededstr[20];
 134         char availablestr[20];
 135
 136         BIO_snprintf(neededstr, sizeof(neededstr), "%zu", bytes_needed);
 137         BIO_snprintf(availablestr, sizeof(availablestr), "%zu", total_length);
 138         RANDerr(RAND_F_RAND_POOL_ACQUIRE_ENTROPY,
 139                 RAND_R_RANDOM_POOL_UNDERFLOW);
 140         ERR_add_error_data(4, "Needed: ", neededstr, ", Available: ",
 141                            availablestr);
 142         return 0;
 143     }
 144
 145     /*
 146      * Try not to overfeed the pool
 147      */
 148     if (total_length > bytes_remaining)
 149         total_length = bytes_remaining;
 150
 151     return rand_pool_add(pool, (PTR_T)data_buffer, total_length,
 152                          total_length * ENTROPY_BITS_PER_BYTE);
 153 }
 154
 155 #endif