- (djm) [kexc25519.c kexc25519c.c kexc25519s.c] Import missed files from
KEX/curve25519 change
This commit is contained in:
Damien Miller
parent
ca67a7eaf8
commit
094003f545
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@ -24,6 +24,8 @@
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[roaming_common.c]
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fix a couple of function definitions foo() -> foo(void)
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(-Wold-style-definition)
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- (djm) [kexc25519.c kexc25519c.c kexc25519s.c] Import missed files from
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KEX/curve25519 change
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20131103
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- (dtucker) [openbsd-compat/bsd-misc.c] Include time.h for nanosleep.
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@ -0,0 +1,127 @@
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/* $OpenBSD: kexc25519.c,v 1.2 2013/11/02 22:02:14 markus Exp $ */
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/*
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* Copyright (c) 2001, 2013 Markus Friedl. All rights reserved.
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* Copyright (c) 2010 Damien Miller. All rights reserved.
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* Copyright (c) 2013 Aris Adamantiadis. 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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#include <sys/types.h>
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#include <signal.h>
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#include <string.h>
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#include "buffer.h"
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#include "ssh2.h"
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#include "key.h"
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#include "cipher.h"
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#include "kex.h"
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#include "log.h"
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extern int crypto_scalarmult_curve25519(u_char a[CURVE25519_SIZE],
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const u_char b[CURVE25519_SIZE], const u_char c[CURVE25519_SIZE])
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__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 3, CURVE25519_SIZE)));
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void
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kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
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{
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static const u_char basepoint[CURVE25519_SIZE] = {9};
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arc4random_buf(key, CURVE25519_SIZE);
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crypto_scalarmult_curve25519(pub, key, basepoint);
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}
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BIGNUM *
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kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
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const u_char pub[CURVE25519_SIZE])
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{
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u_char shared_key[CURVE25519_SIZE];
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BIGNUM *shared_secret;
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crypto_scalarmult_curve25519(shared_key, key, pub);
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#ifdef DEBUG_KEXECDH
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dump_digest("shared secret", shared_key, CURVE25519_SIZE);
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#endif
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if ((shared_secret = BN_new()) == NULL)
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fatal("%s: BN_new failed", __func__);
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if (BN_bin2bn(shared_key, sizeof(shared_key), shared_secret) == NULL)
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fatal("%s: BN_bin2bn failed", __func__);
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memset(shared_key, 0, CURVE25519_SIZE); /* XXX explicit_bzero() */
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return (shared_secret);
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}
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void
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kex_c25519_hash(
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const EVP_MD *evp_md,
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char *client_version_string,
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char *server_version_string,
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char *ckexinit, int ckexinitlen,
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char *skexinit, int skexinitlen,
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u_char *serverhostkeyblob, int sbloblen,
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const u_char client_dh_pub[CURVE25519_SIZE],
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const u_char server_dh_pub[CURVE25519_SIZE],
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const BIGNUM *shared_secret,
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u_char **hash, u_int *hashlen)
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{
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Buffer b;
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EVP_MD_CTX md;
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static u_char digest[EVP_MAX_MD_SIZE];
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buffer_init(&b);
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buffer_put_cstring(&b, client_version_string);
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buffer_put_cstring(&b, server_version_string);
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/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
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buffer_put_int(&b, ckexinitlen+1);
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buffer_put_char(&b, SSH2_MSG_KEXINIT);
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buffer_append(&b, ckexinit, ckexinitlen);
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buffer_put_int(&b, skexinitlen+1);
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buffer_put_char(&b, SSH2_MSG_KEXINIT);
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buffer_append(&b, skexinit, skexinitlen);
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buffer_put_string(&b, serverhostkeyblob, sbloblen);
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buffer_put_string(&b, client_dh_pub, CURVE25519_SIZE);
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buffer_put_string(&b, server_dh_pub, CURVE25519_SIZE);
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buffer_put_bignum2(&b, shared_secret);
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#ifdef DEBUG_KEX
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buffer_dump(&b);
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#endif
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EVP_DigestInit(&md, evp_md);
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EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
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EVP_DigestFinal(&md, digest, NULL);
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buffer_free(&b);
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#ifdef DEBUG_KEX
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dump_digest("hash", digest, EVP_MD_size(evp_md));
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#endif
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*hash = digest;
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*hashlen = EVP_MD_size(evp_md);
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}
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@ -0,0 +1,128 @@
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/* $OpenBSD: kexc25519c.c,v 1.2 2013/11/02 22:02:14 markus Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2010 Damien Miller. All rights reserved.
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* Copyright (c) 2013 Aris Adamantiadis. 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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#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include "xmalloc.h"
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#include "buffer.h"
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#include "key.h"
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#include "cipher.h"
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#include "kex.h"
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#include "log.h"
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#include "packet.h"
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#include "ssh2.h"
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void
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kexc25519_client(Kex *kex)
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{
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BIGNUM *shared_secret;
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Key *server_host_key;
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u_char client_key[CURVE25519_SIZE];
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u_char client_pubkey[CURVE25519_SIZE];
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u_char *server_pubkey = NULL;
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u_char *server_host_key_blob = NULL, *signature = NULL;
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u_char *hash;
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u_int slen, sbloblen, hashlen;
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kexc25519_keygen(client_key, client_pubkey);
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packet_start(SSH2_MSG_KEX_ECDH_INIT);
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packet_put_string(client_pubkey, sizeof(client_pubkey));
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packet_send();
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debug("sending SSH2_MSG_KEX_ECDH_INIT");
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#ifdef DEBUG_KEXECDH
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dump_digest("client private key:", client_key, sizeof(client_key));
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#endif
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debug("expecting SSH2_MSG_KEX_ECDH_REPLY");
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packet_read_expect(SSH2_MSG_KEX_ECDH_REPLY);
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/* hostkey */
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server_host_key_blob = packet_get_string(&sbloblen);
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server_host_key = key_from_blob(server_host_key_blob, sbloblen);
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if (server_host_key == NULL)
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fatal("cannot decode server_host_key_blob");
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if (server_host_key->type != kex->hostkey_type)
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fatal("type mismatch for decoded server_host_key_blob");
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if (kex->verify_host_key == NULL)
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fatal("cannot verify server_host_key");
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if (kex->verify_host_key(server_host_key) == -1)
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fatal("server_host_key verification failed");
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/* Q_S, server public key */
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server_pubkey = packet_get_string(&slen);
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if (slen != CURVE25519_SIZE)
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fatal("Incorrect size for server Curve25519 pubkey: %d", slen);
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#ifdef DEBUG_KEXECDH
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dump_digest("server public key:", server_pubkey, CURVE25519_SIZE);
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#endif
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/* signed H */
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signature = packet_get_string(&slen);
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packet_check_eom();
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shared_secret = kexc25519_shared_key(client_key, server_pubkey);
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/* calc and verify H */
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kex_c25519_hash(
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kex->evp_md,
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kex->client_version_string,
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kex->server_version_string,
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buffer_ptr(&kex->my), buffer_len(&kex->my),
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buffer_ptr(&kex->peer), buffer_len(&kex->peer),
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server_host_key_blob, sbloblen,
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client_pubkey,
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server_pubkey,
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shared_secret,
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&hash, &hashlen
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);
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free(server_host_key_blob);
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free(server_pubkey);
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if (key_verify(server_host_key, signature, slen, hash, hashlen) != 1)
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fatal("key_verify failed for server_host_key");
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key_free(server_host_key);
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free(signature);
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/* save session id */
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if (kex->session_id == NULL) {
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kex->session_id_len = hashlen;
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kex->session_id = xmalloc(kex->session_id_len);
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memcpy(kex->session_id, hash, kex->session_id_len);
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}
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kex_derive_keys(kex, hash, hashlen, shared_secret);
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BN_clear_free(shared_secret);
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kex_finish(kex);
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}
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@ -0,0 +1,123 @@
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/* $OpenBSD: kexc25519s.c,v 1.2 2013/11/02 22:02:14 markus Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2010 Damien Miller. All rights reserved.
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* Copyright (c) 2013 Aris Adamantiadis. All rights reserved.
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*
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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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#include <sys/types.h>
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#include <string.h>
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#include <signal.h>
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#include "xmalloc.h"
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#include "buffer.h"
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#include "key.h"
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#include "cipher.h"
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#include "kex.h"
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#include "log.h"
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#include "packet.h"
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#include "ssh2.h"
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void
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kexc25519_server(Kex *kex)
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{
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BIGNUM *shared_secret;
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Key *server_host_private, *server_host_public;
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u_char *server_host_key_blob = NULL, *signature = NULL;
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u_char server_key[CURVE25519_SIZE];
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u_char *client_pubkey = NULL;
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u_char server_pubkey[CURVE25519_SIZE];
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u_char *hash;
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u_int slen, sbloblen, hashlen;
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/* generate private key */
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kexc25519_keygen(server_key, server_pubkey);
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#ifdef DEBUG_KEXECDH
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dump_digest("server private key:", server_key, sizeof(server_key));
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#endif
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if (kex->load_host_public_key == NULL ||
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kex->load_host_private_key == NULL)
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fatal("Cannot load hostkey");
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server_host_public = kex->load_host_public_key(kex->hostkey_type);
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if (server_host_public == NULL)
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fatal("Unsupported hostkey type %d", kex->hostkey_type);
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server_host_private = kex->load_host_private_key(kex->hostkey_type);
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debug("expecting SSH2_MSG_KEX_ECDH_INIT");
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packet_read_expect(SSH2_MSG_KEX_ECDH_INIT);
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client_pubkey = packet_get_string(&slen);
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if (slen != CURVE25519_SIZE)
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fatal("Incorrect size for server Curve25519 pubkey: %d", slen);
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packet_check_eom();
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#ifdef DEBUG_KEXECDH
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dump_digest("client public key:", client_pubkey, CURVE25519_SIZE);
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#endif
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shared_secret = kexc25519_shared_key(server_key, client_pubkey);
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/* calc H */
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key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
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kex_c25519_hash(
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kex->evp_md,
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kex->client_version_string,
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kex->server_version_string,
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buffer_ptr(&kex->peer), buffer_len(&kex->peer),
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buffer_ptr(&kex->my), buffer_len(&kex->my),
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server_host_key_blob, sbloblen,
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client_pubkey,
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server_pubkey,
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shared_secret,
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&hash, &hashlen
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);
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/* save session id := H */
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if (kex->session_id == NULL) {
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kex->session_id_len = hashlen;
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kex->session_id = xmalloc(kex->session_id_len);
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memcpy(kex->session_id, hash, kex->session_id_len);
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}
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/* sign H */
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kex->sign(server_host_private, server_host_public, &signature, &slen,
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hash, hashlen);
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/* destroy_sensitive_data(); */
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/* send server hostkey, ECDH pubkey 'Q_S' and signed H */
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packet_start(SSH2_MSG_KEX_ECDH_REPLY);
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packet_put_string(server_host_key_blob, sbloblen);
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packet_put_string(server_pubkey, sizeof(server_pubkey));
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packet_put_string(signature, slen);
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packet_send();
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free(signature);
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free(server_host_key_blob);
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/* have keys, free server key */
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free(client_pubkey);
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kex_derive_keys(kex, hash, hashlen, shared_secret);
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BN_clear_free(shared_secret);
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kex_finish(kex);
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}
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