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https://gitee.com/acl-dev/acl.git
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9697f95b8f
This reverts commit 15d999759e
.
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*++
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* NAME
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* tls_prng_dev 3
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* SUMMARY
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* seed OpenSSL PRNG from entropy device
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* SYNOPSIS
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* #include <tls_prng_src.h>
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*
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* TLS_PRNG_SRC *tls_prng_dev_open(name, timeout)
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* const char *name;
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* int timeout;
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*
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* ssize_t tls_prng_dev_read(dev, length)
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* TLS_PRNG_SRC *dev;
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* size_t length;
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*
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* int tls_prng_dev_close(dev)
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* TLS_PRNG_SRC *dev;
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* DESCRIPTION
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* tls_prng_dev_open() opens the specified entropy device
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* and returns a handle that should be used with all subsequent
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* access.
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*
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* tls_prng_dev_read() reads the requested number of bytes from
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* the entropy device and updates the OpenSSL PRNG.
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*
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* tls_prng_dev_close() closes the specified entropy device
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* and releases memory that was allocated for the handle.
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*
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* Arguments:
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* .IP name
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* The pathname of the entropy device.
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* .IP length
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* The number of bytes to read from the entropy device.
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* Request lengths will be truncated at 255 bytes.
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* .IP timeout
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* Time limit on individual I/O operations.
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* DIAGNOSTICS
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* tls_prng_dev_open() returns a null pointer on error.
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*
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* tls_prng_dev_read() returns -1 on error, the number
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* of bytes received on success.
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*
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* tls_prng_dev_close() returns -1 on error, 0 on success.
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*
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* In all cases the errno variable indicates the type of error.
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* LICENSE
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* .ad
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* .fi
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* The Secure Mailer license must be distributed with this software.
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* AUTHOR(S)
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* Wietse Venema
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* IBM T.J. Watson Research
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* P.O. Box 704
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* Yorktown Heights, NY 10598, USA
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*--*/
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#include "StdAfx.h"
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#include <fcntl.h>
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#ifdef ACL_UNIX
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#include <unistd.h>
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#endif
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#include <limits.h>
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#include <errno.h>
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#ifndef UCHAR_MAX
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#define UCHAR_MAX 0xff
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#endif
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/* OpenSSL library. */
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#ifdef USE_TLS
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#include <openssl/rand.h> /* For the PRNG */
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/* TLS library. */
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#include "tls_prng.h"
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/* tls_prng_dev_open - open entropy device */
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TLS_PRNG_SRC *tls_prng_dev_open(const char *name, int timeout)
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{
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const char *myname = "tls_prng_dev_open";
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TLS_PRNG_SRC *dev;
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ACL_FILE_HANDLE fd;
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if ((fd = acl_file_open(name, O_RDONLY, 0)) < 0) {
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if (acl_msg_verbose)
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acl_msg_info("%s: cannot open entropy device %s: %s",
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myname, name, acl_last_serror());
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return (0);
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} else {
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dev = (TLS_PRNG_SRC *) acl_mymalloc(sizeof(*dev));
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dev->fd.file = fd;
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dev->name = acl_mystrdup(name);
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dev->timeout = timeout;
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if (acl_msg_verbose)
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acl_msg_info("%s: opened entropy device %s", myname, name);
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return (dev);
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}
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}
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/* tls_prng_dev_read - update internal PRNG from device */
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ssize_t tls_prng_dev_read(TLS_PRNG_SRC *dev, size_t len)
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{
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const char *myname = "tls_prng_dev_read";
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unsigned char buffer[UCHAR_MAX];
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ssize_t count;
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size_t rand_bytes;
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if (len <= 0)
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acl_msg_panic("%s: bad read length: %ld", myname, (long) len);
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if (len > sizeof(buffer))
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rand_bytes = sizeof(buffer);
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else
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rand_bytes = len;
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errno = 0;
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#ifdef ACL_UNIX
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count = acl_timed_read(dev->fd.file, buffer, (int) rand_bytes, dev->timeout,
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NULL);
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#elif defined(WIN32)
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count = acl_file_read(dev->fd.file, buffer, (int) rand_bytes,
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dev->timeout, NULL, NULL);
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#endif
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if (count > 0) {
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if (acl_msg_verbose)
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acl_msg_info("%s: read %ld bytes from entropy device %s",
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myname, (long) count, dev->name);
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RAND_seed(buffer, count);
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} else {
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if (acl_msg_verbose)
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acl_msg_info("%s: cannot read %ld bytes from entropy device %s: %s",
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myname, (long) rand_bytes, dev->name, acl_last_serror());
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}
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return (count);
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}
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/* tls_prng_dev_close - disconnect from EGD server */
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int tls_prng_dev_close(TLS_PRNG_SRC *dev)
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{
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const char *myname = "tls_prng_dev_close";
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int err;
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if (acl_msg_verbose)
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acl_msg_info("%s: close entropy device %s", myname, dev->name);
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err = acl_file_close(dev->fd.file);
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acl_myfree(dev->name);
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acl_myfree(dev);
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return (err);
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}
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#endif
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