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9697f95b8f
This reverts commit 15d999759e
.
161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
/*++
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* NAME
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* tls_prng_file 3
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* SUMMARY
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* seed OpenSSL PRNG from entropy file
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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_file_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_file_read(fh, length)
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* TLS_PRNG_SRC *fh;
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* size_t length;
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*
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* int tls_prng_file_close(fh)
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* TLS_PRNG_SRC *fh;
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* DESCRIPTION
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* tls_prng_file_open() open the specified file and returns
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* a handle that should be used with all subsequent access.
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*
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* tls_prng_file_read() reads the requested number of bytes from
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* the entropy file and updates the OpenSSL PRNG. The file is not
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* locked for shared or exclusive access.
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*
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* tls_prng_file_close() closes the specified entropy file
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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 file.
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* .IP length
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* The number of bytes to read from the entropy file.
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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_file_open() returns a null pointer on error.
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*
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* tls_prng_file_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_file_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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/* 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_file_open - open entropy file */
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TLS_PRNG_SRC *tls_prng_file_open(const char *name, int timeout)
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{
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const char *myname = "tls_prng_file_open";
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TLS_PRNG_SRC *fh;
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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 file %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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fh = (TLS_PRNG_SRC *) acl_mymalloc(sizeof(*fh));
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fh->fd.file = fd;
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fh->name = acl_mystrdup(name);
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fh->timeout = timeout;
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if (acl_msg_verbose)
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acl_msg_info("%s: opened entropy file %s", myname, name);
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return (fh);
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}
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}
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/* tls_prng_file_read - update internal PRNG from entropy file */
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ssize_t tls_prng_file_read(TLS_PRNG_SRC *fh, size_t len)
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{
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const char *myname = "tls_prng_file_read";
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char buffer[8192];
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ssize_t to_read;
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ssize_t count;
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if (acl_msg_verbose)
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acl_msg_info("%s: seed internal pool from file %s", myname, fh->name);
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if (acl_lseek(fh->fd.file, 0, SEEK_SET) < 0) {
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if (acl_msg_verbose)
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acl_msg_info("%s: cannot seek entropy file %s: %s",
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myname, fh->name, acl_last_serror());
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return (-1);
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}
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errno = 0;
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for (to_read = (ssize_t) len; to_read > 0; to_read -= count) {
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#ifdef ACL_UNIX
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count = acl_timed_read(fh->fd.file, buffer,
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to_read > (ssize_t) sizeof(buffer) ?
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(ssize_t) sizeof(buffer) : to_read,
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fh->timeout, NULL);
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#elif defined(WIN32)
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count = acl_file_read(fh->fd.file, buffer,
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to_read > (ssize_t) sizeof(buffer) ?
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(ssize_t) sizeof(buffer) : to_read,
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fh->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: cannot read entropy file %s: %s",
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myname, fh->name, acl_last_serror());
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return (-1);
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}
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if (count == 0)
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break;
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RAND_seed(buffer, count);
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}
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if (acl_msg_verbose)
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acl_msg_info("%s: read %ld bytes from entropy file %s: %s",
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myname, (long) (len - to_read), fh->name, acl_last_serror());
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return ((ssize_t) (len - to_read));
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}
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/* tls_prng_file_close - close entropy file */
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int tls_prng_file_close(TLS_PRNG_SRC *fh)
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{
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const char *myname = "tls_prng_file_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 file %s", myname, fh->name);
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err = acl_file_close(fh->fd.file);
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acl_myfree(fh->name);
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acl_myfree(fh);
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return (err);
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}
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#endif
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