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e73ccc06ef
This removes quite a bit of code. All reasonable systems have /dev/urandom these days. Linux, Solaris and the BSDs do. In case we find a system without /dev/urandom, we will have to go hunting in other libraries. The main reason for this is speed: On Ubuntu 14.04 doing direct reads from /dev/urandom is 2-3 times faster than our md4 based code. On virtualized FreeBSD 10 the difference is even larger. My first approach was to use fopen/fread. It was even faster, but less than twice as fast. So I thought we could save the additional complexity when having to deal with throwing away buffers when forking and the additional memory footprint per process. With this simple generate_random_buffer it will be easier to adapt new syscalls to get randomness. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org> Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Tue Oct 13 04:25:39 CEST 2015 on sn-devel-104
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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Functions to create reasonable random numbers for crypto use.
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Copyright (C) Jeremy Allison 2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/filesys.h"
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#include "lib/util/genrand.h"
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#include "sys_rw_data.h"
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#include "lib/util/blocking.h"
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static int urand_fd = -1;
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static void open_urandom(void)
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{
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if (urand_fd != -1) {
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return;
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}
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urand_fd = open( "/dev/urandom", O_RDONLY,0);
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if (urand_fd == -1) {
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abort();
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}
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smb_set_close_on_exec(urand_fd);
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}
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_PUBLIC_ void generate_random_buffer(uint8_t *out, int len)
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{
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ssize_t rw_ret;
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open_urandom();
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rw_ret = read_data(urand_fd, out, len);
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if (rw_ret != len) {
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abort();
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}
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}
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/*
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* Keep generate_secret_buffer in case we ever want to do something
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* different
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*/
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_PUBLIC_ void generate_secret_buffer(uint8_t *out, int len)
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{
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generate_random_buffer(out, len);
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}
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