Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/kexdhs.c b/kexdhs.c
new file mode 100644
index 0000000..f56e887
--- /dev/null
+++ b/kexdhs.c
@@ -0,0 +1,168 @@
+/* $OpenBSD: kexdhs.c,v 1.12 2010/11/10 01:33:07 djm Exp $ */
+/*
+ * Copyright (c) 2001 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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 <stdarg.h>
+#include <string.h>
+#include <signal.h>
+
+#include <openssl/dh.h>
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "key.h"
+#include "cipher.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "dh.h"
+#include "ssh2.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+#include "monitor_wrap.h"
+
+void
+kexdh_server(Kex *kex)
+{
+ BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
+ DH *dh;
+ Key *server_host_public, *server_host_private;
+ u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
+ u_int sbloblen, klen, hashlen, slen;
+ int kout;
+
+ /* generate server DH public key */
+ switch (kex->kex_type) {
+ case KEX_DH_GRP1_SHA1:
+ dh = dh_new_group1();
+ break;
+ case KEX_DH_GRP14_SHA1:
+ dh = dh_new_group14();
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
+ }
+ dh_gen_key(dh, kex->we_need * 8);
+
+ debug("expecting SSH2_MSG_KEXDH_INIT");
+ packet_read_expect(SSH2_MSG_KEXDH_INIT);
+
+ if (kex->load_host_public_key == NULL ||
+ kex->load_host_private_key == NULL)
+ fatal("Cannot load hostkey");
+ server_host_public = kex->load_host_public_key(kex->hostkey_type);
+ if (server_host_public == NULL)
+ fatal("Unsupported hostkey type %d", kex->hostkey_type);
+ server_host_private = kex->load_host_private_key(kex->hostkey_type);
+ if (server_host_private == NULL)
+ fatal("Missing private key for hostkey type %d",
+ kex->hostkey_type);
+
+ /* key, cert */
+ if ((dh_client_pub = BN_new()) == NULL)
+ fatal("dh_client_pub == NULL");
+ packet_get_bignum2(dh_client_pub);
+ packet_check_eom();
+
+#ifdef DEBUG_KEXDH
+ fprintf(stderr, "dh_client_pub= ");
+ BN_print_fp(stderr, dh_client_pub);
+ fprintf(stderr, "\n");
+ debug("bits %d", BN_num_bits(dh_client_pub));
+#endif
+
+#ifdef DEBUG_KEXDH
+ DHparams_print_fp(stderr, dh);
+ fprintf(stderr, "pub= ");
+ BN_print_fp(stderr, dh->pub_key);
+ fprintf(stderr, "\n");
+#endif
+ if (!dh_pub_is_valid(dh, dh_client_pub))
+ packet_disconnect("bad client public DH value");
+
+ klen = DH_size(dh);
+ kbuf = xmalloc(klen);
+ if ((kout = DH_compute_key(kbuf, dh_client_pub, dh)) < 0)
+ fatal("DH_compute_key: failed");
+#ifdef DEBUG_KEXDH
+ dump_digest("shared secret", kbuf, kout);
+#endif
+ if ((shared_secret = BN_new()) == NULL)
+ fatal("kexdh_server: BN_new failed");
+ if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
+ fatal("kexdh_server: BN_bin2bn failed");
+ memset(kbuf, 0, klen);
+ xfree(kbuf);
+
+ key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
+
+ /* calc H */
+ kex_dh_hash(
+ kex->client_version_string,
+ kex->server_version_string,
+ buffer_ptr(&kex->peer), buffer_len(&kex->peer),
+ buffer_ptr(&kex->my), buffer_len(&kex->my),
+ server_host_key_blob, sbloblen,
+ dh_client_pub,
+ dh->pub_key,
+ shared_secret,
+ &hash, &hashlen
+ );
+ BN_clear_free(dh_client_pub);
+
+ /* save session id := H */
+ if (kex->session_id == NULL) {
+ kex->session_id_len = hashlen;
+ kex->session_id = xmalloc(kex->session_id_len);
+ memcpy(kex->session_id, hash, kex->session_id_len);
+ }
+
+ /* sign H */
+ if (PRIVSEP(key_sign(server_host_private, &signature, &slen, hash,
+ hashlen)) < 0)
+ fatal("kexdh_server: key_sign failed");
+
+ /* destroy_sensitive_data(); */
+
+ /* send server hostkey, DH pubkey 'f' and singed H */
+ packet_start(SSH2_MSG_KEXDH_REPLY);
+ packet_put_string(server_host_key_blob, sbloblen);
+ packet_put_bignum2(dh->pub_key); /* f */
+ packet_put_string(signature, slen);
+ packet_send();
+
+ xfree(signature);
+ xfree(server_host_key_blob);
+ /* have keys, free DH */
+ DH_free(dh);
+
+ kex_derive_keys(kex, hash, hashlen, shared_secret);
+ BN_clear_free(shared_secret);
+ kex_finish(kex);
+}