Adding upstream version 1:7.9p1.upstream/1%7.9p1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/kexc25519s.c b/kexc25519s.c
new file mode 100644
index 0000000..0800a7a
--- /dev/null
+++ b/kexc25519s.c
@@ -0,0 +1,158 @@
+/* $OpenBSD: kexc25519s.c,v 1.11 2017/05/31 04:19:28 djm Exp $ */
+/*
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ * Copyright (c) 2010 Damien Miller.  All rights reserved.
+ * Copyright (c) 2013 Aris Adamantiadis.  All rights reserved.
+ *
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+
+#include "sshkey.h"
+#include "cipher.h"
+#include "digest.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "ssh2.h"
+#include "sshbuf.h"
+#include "ssherr.h"
+
+static int input_kex_c25519_init(int, u_int32_t, struct ssh *);
+
+int
+kexc25519_server(struct ssh *ssh)
+{
+	debug("expecting SSH2_MSG_KEX_ECDH_INIT");
+	ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_INIT, &input_kex_c25519_init);
+	return 0;
+}
+
+static int
+input_kex_c25519_init(int type, u_int32_t seq, struct ssh *ssh)
+{
+	struct kex *kex = ssh->kex;
+	struct sshkey *server_host_private, *server_host_public;
+	struct sshbuf *shared_secret = NULL;
+	u_char *server_host_key_blob = NULL, *signature = NULL;
+	u_char server_key[CURVE25519_SIZE];
+	u_char *client_pubkey = NULL;
+	u_char server_pubkey[CURVE25519_SIZE];
+	u_char hash[SSH_DIGEST_MAX_LENGTH];
+	size_t slen, pklen, sbloblen, hashlen;
+	int r;
+
+	/* generate private key */
+	kexc25519_keygen(server_key, server_pubkey);
+#ifdef DEBUG_KEXECDH
+	dump_digest("server private key:", server_key, sizeof(server_key));
+#endif
+	if (kex->load_host_public_key == NULL ||
+	    kex->load_host_private_key == NULL) {
+		r = SSH_ERR_INVALID_ARGUMENT;
+		goto out;
+	}
+	server_host_public = kex->load_host_public_key(kex->hostkey_type,
+	    kex->hostkey_nid, ssh);
+	server_host_private = kex->load_host_private_key(kex->hostkey_type,
+	    kex->hostkey_nid, ssh);
+	if (server_host_public == NULL) {
+		r = SSH_ERR_NO_HOSTKEY_LOADED;
+		goto out;
+	}
+
+	if ((r = sshpkt_get_string(ssh, &client_pubkey, &pklen)) != 0 ||
+	    (r = sshpkt_get_end(ssh)) != 0)
+		goto out;
+	if (pklen != CURVE25519_SIZE) {
+		r = SSH_ERR_SIGNATURE_INVALID;
+		goto out;
+	}
+#ifdef DEBUG_KEXECDH
+	dump_digest("client public key:", client_pubkey, CURVE25519_SIZE);
+#endif
+
+	if ((shared_secret = sshbuf_new()) == NULL) {
+		r = SSH_ERR_ALLOC_FAIL;
+		goto out;
+	}
+	if ((r = kexc25519_shared_key(server_key, client_pubkey,
+	    shared_secret)) < 0)
+		goto out;
+
+	/* calc H */
+	if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
+	    &sbloblen)) != 0)
+		goto out;
+	hashlen = sizeof(hash);
+	if ((r = kex_c25519_hash(
+	    kex->hash_alg,
+	    kex->client_version_string,
+	    kex->server_version_string,
+	    sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
+	    sshbuf_ptr(kex->my), sshbuf_len(kex->my),
+	    server_host_key_blob, sbloblen,
+	    client_pubkey,
+	    server_pubkey,
+	    sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
+	    hash, &hashlen)) < 0)
+		goto out;
+
+	/* save session id := H */
+	if (kex->session_id == NULL) {
+		kex->session_id_len = hashlen;
+		kex->session_id = malloc(kex->session_id_len);
+		if (kex->session_id == NULL) {
+			r = SSH_ERR_ALLOC_FAIL;
+			goto out;
+		}
+		memcpy(kex->session_id, hash, kex->session_id_len);
+	}
+
+	/* sign H */
+	if ((r = kex->sign(server_host_private, server_host_public, &signature,
+	     &slen, hash, hashlen, kex->hostkey_alg, ssh->compat)) < 0)
+		goto out;
+
+	/* send server hostkey, ECDH pubkey 'Q_S' and signed H */
+	if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_REPLY)) != 0 ||
+	    (r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
+	    (r = sshpkt_put_string(ssh, server_pubkey, sizeof(server_pubkey))) != 0 ||
+	    (r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
+	    (r = sshpkt_send(ssh)) != 0)
+		goto out;
+
+	if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
+		r = kex_send_newkeys(ssh);
+out:
+	explicit_bzero(hash, sizeof(hash));
+	explicit_bzero(server_key, sizeof(server_key));
+	free(server_host_key_blob);
+	free(signature);
+	free(client_pubkey);
+	sshbuf_free(shared_secret);
+	return r;
+}