144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/*
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* Copyright (c) 2001 Damien Miller. 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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* 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#define RANDOM_SEED_SIZE 48
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#ifdef WITH_OPENSSL
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#include <sys/types.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <openssl/rand.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include "openbsd-compat/openssl-compat.h"
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#include "ssh.h"
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#include "misc.h"
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#include "xmalloc.h"
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#include "atomicio.h"
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#include "pathnames.h"
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#include "log.h"
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#include "sshbuf.h"
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#include "ssherr.h"
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/*
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* Portable OpenSSH PRNG seeding:
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* If OpenSSL has not "internally seeded" itself (e.g. pulled data from
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* /dev/random), then collect RANDOM_SEED_SIZE bytes of randomness from
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* PRNGd.
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*/
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#ifndef OPENSSL_PRNG_ONLY
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void
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rexec_send_rng_seed(struct sshbuf *m)
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{
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u_char buf[RANDOM_SEED_SIZE];
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size_t len = sizeof(buf);
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int r;
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if (RAND_bytes(buf, sizeof(buf)) <= 0) {
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error("Couldn't obtain random bytes (error %ld)",
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ERR_get_error());
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len = 0;
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}
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if ((r = sshbuf_put_string(m, buf, len)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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explicit_bzero(buf, sizeof(buf));
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}
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void
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rexec_recv_rng_seed(struct sshbuf *m)
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{
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const u_char *buf = NULL;
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size_t len = 0;
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int r;
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if ((r = sshbuf_get_string_direct(m, &buf, &len)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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debug3("rexec_recv_rng_seed: seeding rng with %lu bytes",
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(unsigned long)len);
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RAND_add(buf, len, len);
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}
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#endif /* OPENSSL_PRNG_ONLY */
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void
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seed_rng(void)
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{
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unsigned char buf[RANDOM_SEED_SIZE];
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/* Initialise libcrypto */
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ssh_libcrypto_init();
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if (!ssh_compatible_openssl(OPENSSL_VERSION_NUMBER,
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OpenSSL_version_num()))
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fatal("OpenSSL version mismatch. Built against %lx, you "
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"have %lx", (u_long)OPENSSL_VERSION_NUMBER,
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OpenSSL_version_num());
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#ifndef OPENSSL_PRNG_ONLY
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if (RAND_status() == 1)
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debug3("RNG is ready, skipping seeding");
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else {
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if (seed_from_prngd(buf, sizeof(buf)) == -1)
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fatal("Could not obtain seed from PRNGd");
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RAND_add(buf, sizeof(buf), sizeof(buf));
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}
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#endif /* OPENSSL_PRNG_ONLY */
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if (RAND_status() != 1)
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fatal("PRNG is not seeded");
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/* Ensure arc4random() is primed */
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arc4random_buf(buf, sizeof(buf));
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explicit_bzero(buf, sizeof(buf));
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}
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#else /* WITH_OPENSSL */
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#include <stdlib.h>
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#include <string.h>
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/* Actual initialisation is handled in arc4random() */
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void
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seed_rng(void)
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{
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unsigned char buf[RANDOM_SEED_SIZE];
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/* Ensure arc4random() is primed */
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arc4random_buf(buf, sizeof(buf));
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explicit_bzero(buf, sizeof(buf));
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}
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#endif /* WITH_OPENSSL */
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