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rand_unix.c

/* crypto/rand/rand_unix.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#define USE_SOCKETS
#include "e_os.h"
#include "cryptlib.h"
#include <openssl/rand.h>
#include "rand_lcl.h"

#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS))

#include <sys/types.h>
#include <sys/time.h>
#include <sys/times.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>

#ifdef __OpenBSD__
int RAND_poll(void)
{
      u_int32_t rnd = 0, i;
      unsigned char buf[ENTROPY_NEEDED];

      for (i = 0; i < sizeof(buf); i++) {
            if (i % 4 == 0)
                  rnd = arc4random();
            buf[i] = rnd;
            rnd >>= 8;
      }
      RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
      memset(buf, 0, sizeof(buf));

      return 1;
}
#else
int RAND_poll(void)
{
      unsigned long l;
      pid_t curr_pid = getpid();
#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
      unsigned char tmpbuf[ENTROPY_NEEDED];
      int n = 0;
#endif
#ifdef DEVRANDOM
      static const char *randomfiles[] = { DEVRANDOM, NULL };
      const char **randomfile = NULL;
      int fd;
#endif
#ifdef DEVRANDOM_EGD
      static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
      const char **egdsocket = NULL;
#endif

#ifdef DEVRANDOM
      /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
       * have this. Use /dev/urandom if you can as /dev/random may block
       * if it runs out of random entries.  */

      for (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++)
            {
            if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK
#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
               our controlling tty */
                  |O_NOCTTY
#endif
#ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */
                  |O_NOFOLLOW
#endif
                  )) >= 0)
                  {
                  struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
                                                each file. */
                  int r;
                  fd_set fset;

                  do
                        {
                        FD_ZERO(&fset);
                        FD_SET(fd, &fset);
                        r = -1;

                        if (select(fd+1,&fset,NULL,NULL,&t) < 0)
                              t.tv_usec=0;
                        else if (FD_ISSET(fd, &fset))
                              {
                              r=read(fd,(unsigned char *)tmpbuf+n,
                                     ENTROPY_NEEDED-n);
                              if (r > 0)
                                    n += r;
                              }

                        /* Some Unixen will update t, some
                           won't.  For those who won't, give
                           up here, otherwise, we will do
                           this once again for the remaining
                           time. */
                        if (t.tv_usec == 10*1000)
                              t.tv_usec=0;
                        }
                  while ((r > 0 || (errno == EINTR || errno == EAGAIN))
                        && t.tv_usec != 0 && n < ENTROPY_NEEDED);

                  close(fd);
                  }
            }
#endif

#ifdef DEVRANDOM_EGD
      /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
       * collecting daemon. */

      for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
            {
            int r;

            r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
                               ENTROPY_NEEDED-n);
            if (r > 0)
                  n += r;
            }
#endif

#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
      if (n > 0)
            {
            RAND_add(tmpbuf,sizeof tmpbuf,n);
            OPENSSL_cleanse(tmpbuf,n);
            }
#endif

      /* put in some default random data, we need more than just this */
      l=curr_pid;
      RAND_add(&l,sizeof(l),0);
      l=getuid();
      RAND_add(&l,sizeof(l),0);

      l=time(NULL);
      RAND_add(&l,sizeof(l),0);

#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
      return 1;
#else
      return 0;
#endif
}

#endif
#endif

#if defined(OPENSSL_SYS_VXWORKS)
int RAND_poll(void)
{
    return 0;
}
#endif

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