* New upstream release (http://www.openssh.org/txt/release-5.7):

  - Implement Elliptic Curve Cryptography modes for key exchange (ECDH)
    and host/user keys (ECDSA) as specified by RFC5656.  ECDH and ECDSA
    offer better performance than plain DH and DSA at the same equivalent
    symmetric key length, as well as much shorter keys.
  - sftp(1)/sftp-server(8): add a protocol extension to support a hard
    link operation.  It is available through the "ln" command in the
    client.  The old "ln" behaviour of creating a symlink is available
    using its "-s" option or through the preexisting "symlink" command.
  - scp(1): Add a new -3 option to scp: Copies between two remote hosts
    are transferred through the local host (closes: #508613).
  - ssh(1): "atomically" create the listening mux socket by binding it on
    a temporary name and then linking it into position after listen() has
    succeeded.  This allows the mux clients to determine that the server
    socket is either ready or stale without races (closes: #454784).
    Stale server sockets are now automatically removed (closes: #523250).
  - ssh(1): install a SIGCHLD handler to reap expired child process
    (closes: #594687).
  - ssh(1)/ssh-agent(1): honour $TMPDIR for client xauth and ssh-agent
    temporary directories (closes: #357469, although only if you arrange
    for ssh-agent to actually see $TMPDIR since the setgid bit will cause
    it to be stripped off).

1 files changed, 117 insertions, 0 deletions

diff --git a/kexecdh.c b/kexecdh.c
new file mode 100644
index 000000000..f13f69d3b
--- /dev/null
+++ b/kexecdh.c
@@ -0,0 +1,117 @@
+/* $OpenBSD: kexecdh.c,v 1.3 2010/09/22 05:01:29 djm Exp $ */
+/*
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ * Copyright (c) 2010 Damien Miller.  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 OPENSSL_HAS_ECC
+
+#include <sys/types.h>
+
+#include <signal.h>
+#include <string.h>
+
+#include <openssl/bn.h>
+#include <openssl/evp.h>
+#include <openssl/ec.h>
+#include <openssl/ecdh.h>
+
+#include "buffer.h"
+#include "ssh2.h"
+#include "key.h"
+#include "cipher.h"
+#include "kex.h"
+#include "log.h"
+
+int
+kex_ecdh_name_to_nid(const char *kexname)
+{
+        if (strlen(kexname) < sizeof(KEX_ECDH_SHA2_STEM) - 1)
+                fatal("%s: kexname too short \"%s\"", __func__, kexname);
+        return key_curve_name_to_nid(kexname + sizeof(KEX_ECDH_SHA2_STEM) - 1);
+}
+
+const EVP_MD *
+kex_ecdh_name_to_evpmd(const char *kexname)
+{
+        int nid = kex_ecdh_name_to_nid(kexname);
+
+        if (nid == -1)
+                fatal("%s: unsupported ECDH curve \"%s\"", __func__, kexname);
+        return key_ec_nid_to_evpmd(nid);
+}
+
+void
+kex_ecdh_hash(
+    const EVP_MD *evp_md,
+    const EC_GROUP *ec_group,
+    char *client_version_string,
+    char *server_version_string,
+    char *ckexinit, int ckexinitlen,
+    char *skexinit, int skexinitlen,
+    u_char *serverhostkeyblob, int sbloblen,
+    const EC_POINT *client_dh_pub,
+    const EC_POINT *server_dh_pub,
+    const BIGNUM *shared_secret,
+    u_char **hash, u_int *hashlen)
+{
+        Buffer b;
+        EVP_MD_CTX md;
+        static u_char digest[EVP_MAX_MD_SIZE];
+
+        buffer_init(&b);
+        buffer_put_cstring(&b, client_version_string);
+        buffer_put_cstring(&b, server_version_string);
+
+        /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+        buffer_put_int(&b, ckexinitlen+1);
+        buffer_put_char(&b, SSH2_MSG_KEXINIT);
+        buffer_append(&b, ckexinit, ckexinitlen);
+        buffer_put_int(&b, skexinitlen+1);
+        buffer_put_char(&b, SSH2_MSG_KEXINIT);
+        buffer_append(&b, skexinit, skexinitlen);
+
+        buffer_put_string(&b, serverhostkeyblob, sbloblen);
+        buffer_put_ecpoint(&b, ec_group, client_dh_pub);
+        buffer_put_ecpoint(&b, ec_group, server_dh_pub);
+        buffer_put_bignum2(&b, shared_secret);
+
+#ifdef DEBUG_KEX
+        buffer_dump(&b);
+#endif
+        EVP_DigestInit(&md, evp_md);
+        EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
+        EVP_DigestFinal(&md, digest, NULL);
+
+        buffer_free(&b);
+
+#ifdef DEBUG_KEX
+        dump_digest("hash", digest, EVP_MD_size(evp_md));
+#endif
+        *hash = digest;
+        *hashlen = EVP_MD_size(evp_md);
+}
+
+#endif /* OPENSSL_HAS_ECC */