upstream: merge kexkem[cs] into kexgen
from markus@ ok djm@ OpenBSD-Commit-ID: 87d886b7f1812ff9355fda1435f6ea9b71a0ac89
This commit is contained in:
djm@openbsd.org
Damien Miller
parent
71e67fff94
commit
70867e1ca2
140
kexkems.c
140
kexkems.c
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@ -1,140 +0,0 @@
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/* $OpenBSD: kexkems.c,v 1.5 2019/01/21 10:35:09 djm Exp $ */
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/*
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* Copyright (c) 2019 Markus Friedl. 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 <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 "sshkey.h"
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#include "digest.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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#include "sshbuf.h"
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#include "ssherr.h"
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static int input_kex_kem_init(int, u_int32_t, struct ssh *);
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int
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kex_kem_server(struct ssh *ssh)
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{
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debug("expecting SSH2_MSG_KEX_ECDH_INIT");
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ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_INIT, &input_kex_kem_init);
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return 0;
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}
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static int
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input_kex_kem_init(int type, u_int32_t seq, struct ssh *ssh)
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{
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struct kex *kex = ssh->kex;
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struct sshkey *server_host_private, *server_host_public;
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struct sshbuf *shared_secret = NULL;
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struct sshbuf *server_pubkey = NULL;
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struct sshbuf *client_pubkey = NULL;
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u_char *server_host_key_blob = NULL, *signature = NULL;
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u_char hash[SSH_DIGEST_MAX_LENGTH];
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size_t slen, sbloblen, hashlen;
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int r;
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if ((r = kex_load_hostkey(ssh, &server_host_private,
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&server_host_public)) != 0)
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goto out;
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if ((r = sshpkt_getb_froms(ssh, &client_pubkey)) != 0 ||
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(r = sshpkt_get_end(ssh)) != 0)
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goto out;
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/* compute shared secret */
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switch (kex->kex_type) {
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case KEX_DH_GRP1_SHA1:
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case KEX_DH_GRP14_SHA1:
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case KEX_DH_GRP14_SHA256:
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case KEX_DH_GRP16_SHA512:
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case KEX_DH_GRP18_SHA512:
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r = kex_dh_enc(kex, client_pubkey, &server_pubkey,
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&shared_secret);
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break;
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case KEX_ECDH_SHA2:
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r = kex_ecdh_enc(kex, client_pubkey, &server_pubkey,
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&shared_secret);
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break;
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case KEX_C25519_SHA256:
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r = kex_c25519_enc(kex, client_pubkey, &server_pubkey,
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&shared_secret);
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break;
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case KEX_KEM_SNTRUP4591761X25519_SHA512:
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r = kex_kem_sntrup4591761x25519_enc(kex, client_pubkey,
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&server_pubkey, &shared_secret);
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break;
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default:
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r = SSH_ERR_INVALID_ARGUMENT;
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break;
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}
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if (r !=0 )
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goto out;
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/* calc H */
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if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
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&sbloblen)) != 0)
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goto out;
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hashlen = sizeof(hash);
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if ((r = kex_c25519_hash(
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kex->hash_alg,
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kex->client_version,
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kex->server_version,
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sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
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sshbuf_ptr(kex->my), sshbuf_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)) != 0)
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goto out;
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/* sign H */
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if ((r = kex->sign(ssh, server_host_private, server_host_public,
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&signature, &slen, hash, hashlen, kex->hostkey_alg)) != 0)
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goto out;
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/* send server hostkey, ECDH pubkey 'Q_S' and signed H */
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if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_REPLY)) != 0 ||
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(r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
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(r = sshpkt_put_stringb(ssh, server_pubkey)) != 0 ||
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(r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
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(r = sshpkt_send(ssh)) != 0)
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goto out;
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if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
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r = kex_send_newkeys(ssh);
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out:
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explicit_bzero(hash, sizeof(hash));
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free(server_host_key_blob);
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free(signature);
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sshbuf_free(shared_secret);
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sshbuf_free(client_pubkey);
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sshbuf_free(server_pubkey);
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return r;
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}
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