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openssl/crypto/rand/rand_vms.c
Richard Levitte 0a71b62107 VMS: Added new method to gather entropy on VMS, based on SYS$GET_ENTROPY. 
This system services is based on FreeBSD 12's getentropy(), and is
therefore treated the same way as getentropy() with regards to amount
of entropy bits per data bit.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8926)

(cherry picked from commit 8b9896eb293a0861f0b8c191b7a278f176b729e6)
2019-11-02 11:28:57 +01:00

611 lines
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C
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/*
* Copyright 2001-2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "e_os.h"
#if defined(OPENSSL_SYS_VMS)
# define __NEW_STARLET 1 /* New starlet definitions since VMS 7.0 */
# include <unistd.h>
# include "internal/cryptlib.h"
# include <openssl/rand.h>
# include "crypto/rand.h"
# include "rand_local.h"
# include <descrip.h>
# include <dvidef.h>
# include <jpidef.h>
# include <rmidef.h>
# include <syidef.h>
# include <ssdef.h>
# include <starlet.h>
# include <efndef.h>
# include <gen64def.h>
# include <iosbdef.h>
# include <iledef.h>
# include <lib$routines.h>
# ifdef __DECC
# pragma message disable DOLLARID
# endif
# include <dlfcn.h> /* SYS$GET_ENTROPY presence */
# ifndef OPENSSL_RAND_SEED_OS
# error "Unsupported seeding method configured; must be os"
# endif
/*
* DATA COLLECTION METHOD
* ======================
*
* This is a method to get low quality entropy.
* It works by collecting all kinds of statistical data that
* VMS offers and using them as random seed.
*/
/* We need to make sure we have the right size pointer in some cases */
# if __INITIAL_POINTER_SIZE == 64
# pragma pointer_size save
# pragma pointer_size 32
# endif
typedef uint32_t *uint32_t__ptr32;
# if __INITIAL_POINTER_SIZE == 64
# pragma pointer_size restore
# endif
struct item_st {
short length, code; /* length is number of bytes */
};
static const struct item_st DVI_item_data[] = {
{4, DVI$_ERRCNT},
{4, DVI$_REFCNT},
};
static const struct item_st JPI_item_data[] = {
{4, JPI$_BUFIO},
{4, JPI$_CPUTIM},
{4, JPI$_DIRIO},
{4, JPI$_IMAGECOUNT},
{4, JPI$_PAGEFLTS},
{4, JPI$_PID},
{4, JPI$_PPGCNT},
{4, JPI$_WSPEAK},
/*
* Note: the direct result is just a 32-bit address. However, it points
* to a list of 4 32-bit words, so we make extra space for them so we can
* do in-place replacement of values
*/
{16, JPI$_FINALEXC},
};
static const struct item_st JPI_item_data_64bit[] = {
{8, JPI$_LAST_LOGIN_I},
{8, JPI$_LOGINTIM},
};
static const struct item_st RMI_item_data[] = {
{4, RMI$_COLPG},
{4, RMI$_MWAIT},
{4, RMI$_CEF},
{4, RMI$_PFW},
{4, RMI$_LEF},
{4, RMI$_LEFO},
{4, RMI$_HIB},
{4, RMI$_HIBO},
{4, RMI$_SUSP},
{4, RMI$_SUSPO},
{4, RMI$_FPG},
{4, RMI$_COM},
{4, RMI$_COMO},
{4, RMI$_CUR},
#if defined __alpha
{4, RMI$_FRLIST},
{4, RMI$_MODLIST},
#endif
{4, RMI$_FAULTS},
{4, RMI$_PREADS},
{4, RMI$_PWRITES},
{4, RMI$_PWRITIO},
{4, RMI$_PREADIO},
{4, RMI$_GVALFLTS},
{4, RMI$_WRTINPROG},
{4, RMI$_FREFLTS},
{4, RMI$_DZROFLTS},
{4, RMI$_SYSFAULTS},
{4, RMI$_ISWPCNT},
{4, RMI$_DIRIO},
{4, RMI$_BUFIO},
{4, RMI$_MBREADS},
{4, RMI$_MBWRITES},
{4, RMI$_LOGNAM},
{4, RMI$_FCPCALLS},
{4, RMI$_FCPREAD},
{4, RMI$_FCPWRITE},
{4, RMI$_FCPCACHE},
{4, RMI$_FCPCPU},
{4, RMI$_FCPHIT},
{4, RMI$_FCPSPLIT},
{4, RMI$_FCPFAULT},
{4, RMI$_ENQNEW},
{4, RMI$_ENQCVT},
{4, RMI$_DEQ},
{4, RMI$_BLKAST},
{4, RMI$_ENQWAIT},
{4, RMI$_ENQNOTQD},
{4, RMI$_DLCKSRCH},
{4, RMI$_DLCKFND},
{4, RMI$_NUMLOCKS},
{4, RMI$_NUMRES},
{4, RMI$_ARRLOCPK},
{4, RMI$_DEPLOCPK},
{4, RMI$_ARRTRAPK},
{4, RMI$_TRCNGLOS},
{4, RMI$_RCVBUFFL},
{4, RMI$_ENQNEWLOC},
{4, RMI$_ENQNEWIN},
{4, RMI$_ENQNEWOUT},
{4, RMI$_ENQCVTLOC},
{4, RMI$_ENQCVTIN},
{4, RMI$_ENQCVTOUT},
{4, RMI$_DEQLOC},
{4, RMI$_DEQIN},
{4, RMI$_DEQOUT},
{4, RMI$_BLKLOC},
{4, RMI$_BLKIN},
{4, RMI$_BLKOUT},
{4, RMI$_DIRIN},
{4, RMI$_DIROUT},
/* We currently get a fault when trying these. TODO: To be figured out. */
#if 0
{140, RMI$_MSCP_EVERYTHING}, /* 35 32-bit words */
{152, RMI$_DDTM_ALL}, /* 38 32-bit words */
{80, RMI$_TMSCP_EVERYTHING} /* 20 32-bit words */
#endif
{4, RMI$_LPZ_PAGCNT},
{4, RMI$_LPZ_HITS},
{4, RMI$_LPZ_MISSES},
{4, RMI$_LPZ_EXPCNT},
{4, RMI$_LPZ_ALLOCF},
{4, RMI$_LPZ_ALLOC2},
{4, RMI$_ACCESS},
{4, RMI$_ALLOC},
{4, RMI$_FCPCREATE},
{4, RMI$_VOLWAIT},
{4, RMI$_FCPTURN},
{4, RMI$_FCPERASE},
{4, RMI$_OPENS},
{4, RMI$_FIDHIT},
{4, RMI$_FIDMISS},
{4, RMI$_FILHDR_HIT},
{4, RMI$_DIRFCB_HIT},
{4, RMI$_DIRFCB_MISS},
{4, RMI$_DIRDATA_HIT},
{4, RMI$_EXTHIT},
{4, RMI$_EXTMISS},
{4, RMI$_QUOHIT},
{4, RMI$_QUOMISS},
{4, RMI$_STORAGMAP_HIT},
{4, RMI$_VOLLCK},
{4, RMI$_SYNCHLCK},
{4, RMI$_SYNCHWAIT},
{4, RMI$_ACCLCK},
{4, RMI$_XQPCACHEWAIT},
{4, RMI$_DIRDATA_MISS},
{4, RMI$_FILHDR_MISS},
{4, RMI$_STORAGMAP_MISS},
{4, RMI$_PROCCNTMAX},
{4, RMI$_PROCBATCNT},
{4, RMI$_PROCINTCNT},
{4, RMI$_PROCNETCNT},
{4, RMI$_PROCSWITCHCNT},
{4, RMI$_PROCBALSETCNT},
{4, RMI$_PROCLOADCNT},
{4, RMI$_BADFLTS},
{4, RMI$_EXEFAULTS},
{4, RMI$_HDRINSWAPS},
{4, RMI$_HDROUTSWAPS},
{4, RMI$_IOPAGCNT},
{4, RMI$_ISWPCNTPG},
{4, RMI$_OSWPCNT},
{4, RMI$_OSWPCNTPG},
{4, RMI$_RDFAULTS},
{4, RMI$_TRANSFLTS},
{4, RMI$_WRTFAULTS},
#if defined __alpha
{4, RMI$_USERPAGES},
#endif
{4, RMI$_VMSPAGES},
{4, RMI$_TTWRITES},
{4, RMI$_BUFOBJPAG},
{4, RMI$_BUFOBJPAGPEAK},
{4, RMI$_BUFOBJPAGS01},
{4, RMI$_BUFOBJPAGS2},
{4, RMI$_BUFOBJPAGMAXS01},
{4, RMI$_BUFOBJPAGMAXS2},
{4, RMI$_BUFOBJPAGPEAKS01},
{4, RMI$_BUFOBJPAGPEAKS2},
{4, RMI$_BUFOBJPGLTMAXS01},
{4, RMI$_BUFOBJPGLTMAXS2},
{4, RMI$_DLCK_INCMPLT},
{4, RMI$_DLCKMSGS_IN},
{4, RMI$_DLCKMSGS_OUT},
{4, RMI$_MCHKERRS},
{4, RMI$_MEMERRS},
};
static const struct item_st RMI_item_data_64bit[] = {
#if defined __ia64
{8, RMI$_FRLIST},
{8, RMI$_MODLIST},
#endif
{8, RMI$_LCKMGR_REQCNT},
{8, RMI$_LCKMGR_REQTIME},
{8, RMI$_LCKMGR_SPINCNT},
{8, RMI$_LCKMGR_SPINTIME},
{8, RMI$_CPUINTSTK},
{8, RMI$_CPUMPSYNCH},
{8, RMI$_CPUKERNEL},
{8, RMI$_CPUEXEC},
{8, RMI$_CPUSUPER},
{8, RMI$_CPUUSER},
#if defined __ia64
{8, RMI$_USERPAGES},
#endif
{8, RMI$_TQETOTAL},
{8, RMI$_TQESYSUB},
{8, RMI$_TQEUSRTIMR},
{8, RMI$_TQEUSRWAKE},
};
static const struct item_st SYI_item_data[] = {
{4, SYI$_PAGEFILE_FREE},
};
/*
* Input:
* items_data - an array of lengths and codes
* items_data_num - number of elements in that array
*
* Output:
* items - pre-allocated ILE3 array to be filled.
* It's assumed to have items_data_num elements plus
* one extra for the terminating NULL element
* databuffer - pre-allocated 32-bit word array.
*
* Returns the number of elements used in databuffer
*/
static size_t prepare_item_list(const struct item_st *items_input,
size_t items_input_num,
ILE3 *items,
uint32_t__ptr32 databuffer)
{
size_t data_sz = 0;
for (; items_input_num-- > 0; items_input++, items++) {
items->ile3$w_code = items_input->code;
/* Special treatment of JPI$_FINALEXC */
if (items->ile3$w_code == JPI$_FINALEXC)
items->ile3$w_length = 4;
else
items->ile3$w_length = items_input->length;
items->ile3$ps_bufaddr = databuffer;
items->ile3$ps_retlen_addr = 0;
databuffer += items_input->length / sizeof(databuffer[0]);
data_sz += items_input->length;
}
/* Terminating NULL entry */
items->ile3$w_length = items->ile3$w_code = 0;
items->ile3$ps_bufaddr = items->ile3$ps_retlen_addr = NULL;
return data_sz / sizeof(databuffer[0]);
}
static void massage_JPI(ILE3 *items)
{
/*
* Special treatment of JPI$_FINALEXC
* The result of that item's data buffer is a 32-bit address to a list of
* 4 32-bit words.
*/
for (; items->ile3$w_length != 0; items++) {
if (items->ile3$w_code == JPI$_FINALEXC) {
uint32_t *data = items->ile3$ps_bufaddr;
uint32_t *ptr = (uint32_t *)*data;
size_t j;
/*
* We know we made space for 4 32-bit words, so we can do in-place
* replacement.
*/
for (j = 0; j < 4; j++)
data[j] = ptr[j];
break;
}
}
}
/*
* This number expresses how many bits of data contain 1 bit of entropy.
*
* For the moment, we assume about 0.05 entropy bits per data bit, or 1
* bit of entropy per 20 data bits.
*/
#define ENTROPY_FACTOR 20
size_t data_collect_method(RAND_POOL *pool)
{
ILE3 JPI_items_64bit[OSSL_NELEM(JPI_item_data_64bit) + 1];
ILE3 RMI_items_64bit[OSSL_NELEM(RMI_item_data_64bit) + 1];
ILE3 DVI_items[OSSL_NELEM(DVI_item_data) + 1];
ILE3 JPI_items[OSSL_NELEM(JPI_item_data) + 1];
ILE3 RMI_items[OSSL_NELEM(RMI_item_data) + 1];
ILE3 SYI_items[OSSL_NELEM(SYI_item_data) + 1];
union {
/* This ensures buffer starts at 64 bit boundary */
uint64_t dummy;
uint32_t buffer[OSSL_NELEM(JPI_item_data_64bit) * 2
+ OSSL_NELEM(RMI_item_data_64bit) * 2
+ OSSL_NELEM(DVI_item_data)
+ OSSL_NELEM(JPI_item_data)
+ OSSL_NELEM(RMI_item_data)
+ OSSL_NELEM(SYI_item_data)
+ 4 /* For JPI$_FINALEXC */];
} data;
size_t total_elems = 0;
size_t total_length = 0;
size_t bytes_needed = rand_pool_bytes_needed(pool, ENTROPY_FACTOR);
size_t bytes_remaining = rand_pool_bytes_remaining(pool);
/* Take all the 64-bit items first, to ensure proper alignment of data */
total_elems +=
prepare_item_list(JPI_item_data_64bit, OSSL_NELEM(JPI_item_data_64bit),
JPI_items_64bit, &data.buffer[total_elems]);
total_elems +=
prepare_item_list(RMI_item_data_64bit, OSSL_NELEM(RMI_item_data_64bit),
RMI_items_64bit, &data.buffer[total_elems]);
/* Now the 32-bit items */
total_elems += prepare_item_list(DVI_item_data, OSSL_NELEM(DVI_item_data),
DVI_items, &data.buffer[total_elems]);
total_elems += prepare_item_list(JPI_item_data, OSSL_NELEM(JPI_item_data),
JPI_items, &data.buffer[total_elems]);
total_elems += prepare_item_list(RMI_item_data, OSSL_NELEM(RMI_item_data),
RMI_items, &data.buffer[total_elems]);
total_elems += prepare_item_list(SYI_item_data, OSSL_NELEM(SYI_item_data),
SYI_items, &data.buffer[total_elems]);
total_length = total_elems * sizeof(data.buffer[0]);
/* Fill data.buffer with various info bits from this process */
{
uint32_t status;
uint32_t efn;
IOSB iosb;
$DESCRIPTOR(SYSDEVICE,"SYS$SYSDEVICE:");
if ((status = sys$getdviw(EFN$C_ENF, 0, &SYSDEVICE, DVI_items,
0, 0, 0, 0, 0)) != SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$getjpiw(EFN$C_ENF, 0, 0, JPI_items_64bit, 0, 0, 0))
!= SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$getjpiw(EFN$C_ENF, 0, 0, JPI_items, 0, 0, 0))
!= SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$getsyiw(EFN$C_ENF, 0, 0, SYI_items, 0, 0, 0))
!= SS$_NORMAL) {
lib$signal(status);
return 0;
}
/*
* The RMI service is a bit special, as there is no synchronous
* variant, so we MUST create an event flag to synchronise on.
*/
if ((status = lib$get_ef(&efn)) != SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$getrmi(efn, 0, 0, RMI_items_64bit, &iosb, 0, 0))
!= SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$synch(efn, &iosb)) != SS$_NORMAL) {
lib$signal(status);
return 0;
}
if (iosb.iosb$l_getxxi_status != SS$_NORMAL) {
lib$signal(iosb.iosb$l_getxxi_status);
return 0;
}
if ((status = sys$getrmi(efn, 0, 0, RMI_items, &iosb, 0, 0))
!= SS$_NORMAL) {
lib$signal(status);
return 0;
}
if ((status = sys$synch(efn, &iosb)) != SS$_NORMAL) {
lib$signal(status);
return 0;
}
if (iosb.iosb$l_getxxi_status != SS$_NORMAL) {
lib$signal(iosb.iosb$l_getxxi_status);
return 0;
}
if ((status = lib$free_ef(&efn)) != SS$_NORMAL) {
lib$signal(status);
return 0;
}
}
massage_JPI(JPI_items);
/*
* If we can't feed the requirements from the caller, we're in deep trouble.
*/
if (!ossl_assert(total_length >= bytes_needed)) {
ERR_raise_data(ERR_LIB_RAND, RAND_R_RANDOM_POOL_UNDERFLOW,
"Needed: %zu, Available: %zu",
bytes_needed, total_length);
return 0;
}
/*
* Try not to overfeed the pool
*/
if (total_length > bytes_remaining)
total_length = bytes_remaining;
/* We give the pessimistic value for the amount of entropy */
rand_pool_add(pool, (unsigned char *)data.buffer, total_length,
8 * total_length / ENTROPY_FACTOR);
return rand_pool_entropy_available(pool);
}
int rand_pool_add_nonce_data(RAND_POOL *pool)
{
struct {
pid_t pid;
CRYPTO_THREAD_ID tid;
uint64_t time;
} data = { 0 };
/*
* Add process id, thread id, and a high resolution timestamp
* (where available, which is OpenVMS v8.4 and up) to ensure that
* the nonce is unique whith high probability for different process
* instances.
*/
data.pid = getpid();
data.tid = CRYPTO_THREAD_get_current_id();
#if __CRTL_VER >= 80400000
sys$gettim_prec(&data.time);
#else
sys$gettim((void*)&data.time);
#endif
return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
}
/*
* SYS$GET_ENTROPY METHOD
* ======================
*
* This is a high entropy method based on a new system service that is
* based on getentropy() from FreeBSD 12. It's only used if available,
* and its availability is detected at run-time.
*
* We assume that this function provides full entropy random output.
*/
#define PUBLIC_VECTORS "SYS$LIBRARY:SYS$PUBLIC_VECTORS.EXE"
#define GET_ENTROPY "SYS$GET_ENTROPY"
static int get_entropy_address_flag = 0;
static int (*get_entropy_address)(void *buffer, size_t buffer_size) = NULL;
static int init_get_entropy_address(void)
{
if (get_entropy_address_flag == 0)
get_entropy_address = dlsym(dlopen(PUBLIC_VECTORS, 0), GET_ENTROPY);
get_entropy_address_flag = 1;
return get_entropy_address != NULL;
}
size_t get_entropy_method(RAND_POOL *pool)
{
/*
* The documentation says that SYS$GET_ENTROPY will give a maximum of
* 256 bytes of data.
*/
unsigned char buffer[256];
size_t bytes_needed;
size_t bytes_to_get = 0;
uint32_t status;
for (bytes_needed = rand_pool_bytes_needed(pool, 1);
bytes_needed > 0;
bytes_needed -= bytes_to_get) {
bytes_to_get =
bytes_needed > sizeof(buffer) ? sizeof(buffer) : bytes_needed;
status = get_entropy_address(buffer, bytes_to_get);
if (status == SS$_RETRY) {
/* Set to zero so the loop doesn't diminish |bytes_needed| */
bytes_to_get = 0;
/* Should sleep some amount of time */
continue;
}
if (status != SS$_NORMAL) {
lib$signal(status);
return 0;
}
rand_pool_add(pool, buffer, bytes_to_get, 8 * bytes_to_get);
}
return rand_pool_entropy_available(pool);
}
/*
* MAIN ENTROPY ACQUISITION FUNCTIONS
* ==================================
*
* These functions are called by the RAND / DRBG functions
*/
size_t rand_pool_acquire_entropy(RAND_POOL *pool)
{
if (init_get_entropy_address())
return get_entropy_method(pool);
return data_collect_method(pool);
}
int rand_pool_add_additional_data(RAND_POOL *pool)
{
struct {
CRYPTO_THREAD_ID tid;
uint64_t time;
} data = { 0 };
/*
* Add some noise from the thread id and a high resolution timer.
* The thread id adds a little randomness if the drbg is accessed
* concurrently (which is the case for the <master> drbg).
*/
data.tid = CRYPTO_THREAD_get_current_id();
#if __CRTL_VER >= 80400000
sys$gettim_prec(&data.time);
#else
sys$gettim((void*)&data.time);
#endif
return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
}
int rand_pool_init(void)
{
return 1;
}
void rand_pool_cleanup(void)
{
}
void rand_pool_keep_random_devices_open(int keep)
{
}
#endif
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