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openssl/crypto/rand/rand_egd.c
David Woodhouse 4d60c7e10f RT3969: Add OPENSSL_SYS_UEFI 
This provides support for building in the EDK II reference implementation
of UEFI. Most UEFI firmware in existence uses OpenSSL for implementing
the core cryptographic functionality needed for Secure Boot.

This has always previously been handled with external patches to OpenSSL
but we are now making a concerted effort to eliminate those.

In this mode, we don't actually use the OpenSSL makefiles; we process
the MINFO file generated by 'make files' and incorporate it into the
EDK2 build system.

Since EDK II builds for various targets with varying word size and we
need to have a single prepackaged configuration, we deliberately don't
hard-code the setting of SIXTY_FOUR_BIT vs. THIRTY_TWO_BIT in
opensslconf.h. We bypass that for OPENSSL_SYS_UEFI and allow EDK II
itself to set those, depending on the architecture.

For x86_64, EDK II sets SIXTY_FOUR_BIT and thus uses 'long long' for the
64-bit type, even when building with GCC where 'long' is also 64-bit. We
do this because the Microsoft toolchain has 32-bit 'long'.

Signed-off-by: Rich Salz <rsalz@akamai.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
2015-09-08 23:14:36 -04:00

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/* crypto/rand/rand_egd.c */
/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
/* ====================================================================
* 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).
*
*/
#include <openssl/e_os2.h>
#include <openssl/rand.h>
#include <openssl/buffer.h>
/*-
* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
*
* This module supplies three routines:
*
* RAND_query_egd_bytes(path, buf, bytes)
* will actually query "bytes" bytes of entropy form the egd-socket located
* at path and will write them to buf (if supplied) or will directly feed
* it to RAND_seed() if buf==NULL.
* The number of bytes is not limited by the maximum chunk size of EGD,
* which is 255 bytes. If more than 255 bytes are wanted, several chunks
* of entropy bytes are requested. The connection is left open until the
* query is competed.
* RAND_query_egd_bytes() returns with
* -1 if an error occurred during connection or communication.
* num the number of bytes read from the EGD socket. This number is either
* the number of bytes requested or smaller, if the EGD pool is
* drained and the daemon signals that the pool is empty.
* This routine does not touch any RAND_status(). This is necessary, since
* PRNG functions may call it during initialization.
*
* RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
* used to seed the PRNG.
* RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
* Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
* seed status so that the return value can reflect the seed state:
* -1 if an error occurred during connection or communication _or_
* if the PRNG has still not received the required seeding.
* num the number of bytes read from the EGD socket. This number is either
* the number of bytes requested or smaller, if the EGD pool is
* drained and the daemon signals that the pool is empty.
*
* RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
* the PRNG.
* RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
*/
#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_UEFI)
int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
{
return (-1);
}
int RAND_egd(const char *path)
{
return (-1);
}
int RAND_egd_bytes(const char *path, int bytes)
{
return (-1);
}
#else
# include <openssl/opensslconf.h>
# include OPENSSL_UNISTD
# include <stddef.h>
# include <sys/types.h>
# include <sys/socket.h>
# ifndef NO_SYS_UN_H
# ifdef OPENSSL_SYS_VXWORKS
# include <streams/un.h>
# else
# include <sys/un.h>
# endif
# else
struct sockaddr_un {
short sun_family; /* AF_UNIX */
char sun_path[108]; /* path name (gag) */
};
# endif /* NO_SYS_UN_H */
# include <string.h>
# include <errno.h>
int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
{
int ret = 0;
struct sockaddr_un addr;
int len, num, numbytes;
int fd = -1;
int success;
unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
if (strlen(path) >= sizeof(addr.sun_path))
return (-1);
BUF_strlcpy(addr.sun_path, path, sizeof addr.sun_path);
len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1)
return (-1);
success = 0;
while (!success) {
if (connect(fd, (struct sockaddr *)&addr, len) == 0)
success = 1;
else {
switch (errno) {
# ifdef EINTR
case EINTR:
# endif
# ifdef EAGAIN
case EAGAIN:
# endif
# ifdef EINPROGRESS
case EINPROGRESS:
# endif
# ifdef EALREADY
case EALREADY:
# endif
/* No error, try again */
break;
# ifdef EISCONN
case EISCONN:
success = 1;
break;
# endif
default:
goto err; /* failure */
}
}
}
while (bytes > 0) {
egdbuf[0] = 1;
egdbuf[1] = bytes < 255 ? bytes : 255;
numbytes = 0;
while (numbytes != 2) {
num = write(fd, egdbuf + numbytes, 2 - numbytes);
if (num >= 0)
numbytes += num;
else {
switch (errno) {
# ifdef EINTR
case EINTR:
# endif
# ifdef EAGAIN
case EAGAIN:
# endif
/* No error, try again */
break;
default:
ret = -1;
goto err; /* failure */
}
}
}
numbytes = 0;
while (numbytes != 1) {
num = read(fd, egdbuf, 1);
if (num == 0)
goto err; /* descriptor closed */
else if (num > 0)
numbytes += num;
else {
switch (errno) {
# ifdef EINTR
case EINTR:
# endif
# ifdef EAGAIN
case EAGAIN:
# endif
/* No error, try again */
break;
default:
ret = -1;
goto err; /* failure */
}
}
}
if (egdbuf[0] == 0)
goto err;
if (buf)
retrievebuf = buf + ret;
else
retrievebuf = tempbuf;
numbytes = 0;
while (numbytes != egdbuf[0]) {
num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
if (num == 0)
goto err; /* descriptor closed */
else if (num > 0)
numbytes += num;
else {
switch (errno) {
# ifdef EINTR
case EINTR:
# endif
# ifdef EAGAIN
case EAGAIN:
# endif
/* No error, try again */
break;
default:
ret = -1;
goto err; /* failure */
}
}
}
ret += egdbuf[0];
bytes -= egdbuf[0];
if (!buf)
RAND_seed(tempbuf, egdbuf[0]);
}
err:
if (fd != -1)
close(fd);
return (ret);
}
int RAND_egd_bytes(const char *path, int bytes)
{
int num, ret = 0;
num = RAND_query_egd_bytes(path, NULL, bytes);
if (num < 1)
goto err;
if (RAND_status() == 1)
ret = num;
err:
return (ret);
}
int RAND_egd(const char *path)
{
return (RAND_egd_bytes(path, 255));
}
#endif
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