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-rw-r--r--kexgex.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/kexgex.c b/kexgex.c
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+/* $OpenBSD: kexgex.c,v 1.32 2019/01/23 00:30:41 djm Exp $ */
+/*
+ * Copyright (c) 2000 Niels Provos. All rights reserved.
+ * 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"
+
+#ifdef WITH_OPENSSL
+
+#include <sys/types.h>
+
+#include <openssl/evp.h>
+#include <signal.h>
+
+#include "openbsd-compat/openssl-compat.h"
+
+#include "sshkey.h"
+#include "cipher.h"
+#include "kex.h"
+#include "ssh2.h"
+#include "ssherr.h"
+#include "sshbuf.h"
+#include "digest.h"
+
+int
+kexgex_hash(
+ int hash_alg,
+ const struct sshbuf *client_version,
+ const struct sshbuf *server_version,
+ const struct sshbuf *client_kexinit,
+ const struct sshbuf *server_kexinit,
+ const struct sshbuf *server_host_key_blob,
+ int min, int wantbits, int max,
+ const BIGNUM *prime,
+ const BIGNUM *gen,
+ const BIGNUM *client_dh_pub,
+ const BIGNUM *server_dh_pub,
+ const u_char *shared_secret, size_t secretlen,
+ u_char *hash, size_t *hashlen)
+{
+ struct sshbuf *b;
+ int r;
+
+ if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
+ return SSH_ERR_INVALID_ARGUMENT;
+ if ((b = sshbuf_new()) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ if ((r = sshbuf_put_stringb(b, client_version)) < 0 ||
+ (r = sshbuf_put_stringb(b, server_version)) < 0 ||
+ /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+ (r = sshbuf_put_u32(b, sshbuf_len(client_kexinit) + 1)) != 0 ||
+ (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+ (r = sshbuf_putb(b, client_kexinit)) != 0 ||
+ (r = sshbuf_put_u32(b, sshbuf_len(server_kexinit) + 1)) != 0 ||
+ (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+ (r = sshbuf_putb(b, server_kexinit)) != 0 ||
+ (r = sshbuf_put_stringb(b, server_host_key_blob)) != 0 ||
+ (min != -1 && (r = sshbuf_put_u32(b, min)) != 0) ||
+ (r = sshbuf_put_u32(b, wantbits)) != 0 ||
+ (max != -1 && (r = sshbuf_put_u32(b, max)) != 0) ||
+ (r = sshbuf_put_bignum2(b, prime)) != 0 ||
+ (r = sshbuf_put_bignum2(b, gen)) != 0 ||
+ (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
+ (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
+ (r = sshbuf_put(b, shared_secret, secretlen)) != 0) {
+ sshbuf_free(b);
+ return r;
+ }
+#ifdef DEBUG_KEXDH
+ sshbuf_dump(b, stderr);
+#endif
+ if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
+ sshbuf_free(b);
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ }
+ sshbuf_free(b);
+ *hashlen = ssh_digest_bytes(hash_alg);
+#ifdef DEBUG_KEXDH
+ dump_digest("hash", hash, *hashlen);
+#endif
+ return 0;
+}
+#endif /* WITH_OPENSSL */