248 lines
6.9 KiB
C
248 lines
6.9 KiB
C
/*
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* Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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#ifdef OPENSSL_NO_EGD
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NON_EMPTY_TRANSLATION_UNIT
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#else
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# include <openssl/crypto.h>
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# include <openssl/e_os2.h>
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# include <openssl/rand.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 occurred 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 occurred 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) || defined(OPENSSL_SYS_UEFI)
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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 <stddef.h>
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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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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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OPENSSL_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)
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return (-1);
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success = 0;
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while (!success) {
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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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switch (errno) {
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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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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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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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switch (errno) {
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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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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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switch (errno) {
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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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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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switch (errno) {
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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)
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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)
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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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#endif
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