303 lines
8.4 KiB
C
303 lines
8.4 KiB
C
/* crypto/rand/rand_egd.c */
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/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
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/* ====================================================================
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* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <openssl/e_os2.h>
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#include <openssl/rand.h>
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#include <openssl/buffer.h>
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/*
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* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
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*
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* This module supplies three routines:
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*
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* RAND_query_egd_bytes(path, buf, bytes)
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* will actually query "bytes" bytes of entropy form the egd-socket located
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* at path and will write them to buf (if supplied) or will directly feed
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* it to RAND_seed() if buf==NULL.
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* The number of bytes is not limited by the maximum chunk size of EGD,
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* which is 255 bytes. If more than 255 bytes are wanted, several chunks
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* of entropy bytes are requested. The connection is left open until the
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* query is competed.
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* RAND_query_egd_bytes() returns with
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* -1 if an error occured during connection or communication.
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* num the number of bytes read from the EGD socket. This number is either
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* the number of bytes requested or smaller, if the EGD pool is
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* drained and the daemon signals that the pool is empty.
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* This routine does not touch any RAND_status(). This is necessary, since
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* PRNG functions may call it during initialization.
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*
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* RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
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* used to seed the PRNG.
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* RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
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* Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
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* seed status so that the return value can reflect the seed state:
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* -1 if an error occured during connection or communication _or_
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* if the PRNG has still not received the required seeding.
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* num the number of bytes read from the EGD socket. This number is either
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* the number of bytes requested or smaller, if the EGD pool is
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* drained and the daemon signals that the pool is empty.
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*
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* RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
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* the PRNG.
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* RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
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*/
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#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS)
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int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
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{
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return(-1);
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}
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int RAND_egd(const char *path)
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{
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return(-1);
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}
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int RAND_egd_bytes(const char *path,int bytes)
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{
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return(-1);
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}
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#else
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#include <openssl/opensslconf.h>
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#include OPENSSL_UNISTD
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifndef NO_SYS_UN_H
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# ifdef OPENSSL_SYS_VXWORKS
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# include <streams/un.h>
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# else
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# include <sys/un.h>
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# endif
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#else
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struct sockaddr_un {
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short sun_family; /* AF_UNIX */
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char sun_path[108]; /* path name (gag) */
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};
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#endif /* NO_SYS_UN_H */
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#include <string.h>
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#include <errno.h>
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#ifndef offsetof
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# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif
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int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
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{
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int ret = 0;
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struct sockaddr_un addr;
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int len, num, numbytes;
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int fd = -1;
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int success;
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unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
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memset(&addr, 0, sizeof(addr));
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addr.sun_family = AF_UNIX;
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if (strlen(path) >= sizeof(addr.sun_path))
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return (-1);
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BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
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len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd == -1) return (-1);
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success = 0;
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while (!success)
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{
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if (connect(fd, (struct sockaddr *)&addr, len) == 0)
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success = 1;
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else
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{
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switch (errno)
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{
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#ifdef EINTR
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case EINTR:
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#endif
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#ifdef EAGAIN
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case EAGAIN:
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#endif
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#ifdef EINPROGRESS
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case EINPROGRESS:
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#endif
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#ifdef EALREADY
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case EALREADY:
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#endif
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/* No error, try again */
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break;
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#ifdef EISCONN
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case EISCONN:
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success = 1;
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break;
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#endif
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default:
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goto err; /* failure */
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}
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}
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}
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while(bytes > 0)
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{
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egdbuf[0] = 1;
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egdbuf[1] = bytes < 255 ? bytes : 255;
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numbytes = 0;
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while (numbytes != 2)
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{
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num = write(fd, egdbuf + numbytes, 2 - numbytes);
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if (num >= 0)
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numbytes += num;
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else
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{
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switch (errno)
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{
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#ifdef EINTR
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case EINTR:
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#endif
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#ifdef EAGAIN
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case EAGAIN:
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#endif
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/* No error, try again */
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break;
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default:
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ret = -1;
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goto err; /* failure */
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}
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}
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}
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numbytes = 0;
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while (numbytes != 1)
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{
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num = read(fd, egdbuf, 1);
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if (num == 0)
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goto err; /* descriptor closed */
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else if (num > 0)
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numbytes += num;
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else
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{
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switch (errno)
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{
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#ifdef EINTR
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case EINTR:
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#endif
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#ifdef EAGAIN
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case EAGAIN:
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#endif
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/* No error, try again */
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break;
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default:
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ret = -1;
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goto err; /* failure */
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}
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}
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}
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if(egdbuf[0] == 0)
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goto err;
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if (buf)
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retrievebuf = buf + ret;
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else
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retrievebuf = tempbuf;
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numbytes = 0;
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while (numbytes != egdbuf[0])
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{
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num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
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if (num == 0)
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goto err; /* descriptor closed */
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else if (num > 0)
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numbytes += num;
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else
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{
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switch (errno)
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{
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#ifdef EINTR
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case EINTR:
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#endif
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#ifdef EAGAIN
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case EAGAIN:
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#endif
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/* No error, try again */
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break;
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default:
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ret = -1;
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goto err; /* failure */
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}
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}
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}
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ret += egdbuf[0];
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bytes -= egdbuf[0];
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if (!buf)
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RAND_seed(tempbuf, egdbuf[0]);
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}
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err:
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if (fd != -1) close(fd);
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return(ret);
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}
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int RAND_egd_bytes(const char *path, int bytes)
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{
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int num, ret = 0;
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num = RAND_query_egd_bytes(path, NULL, bytes);
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if (num < 1) goto err;
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if (RAND_status() == 1)
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ret = num;
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err:
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return(ret);
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}
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int RAND_egd(const char *path)
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{
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return (RAND_egd_bytes(path, 255));
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}
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#endif
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