- djm@cvs.openbsd.org 2010/09/22 05:01:30

     [kex.c kex.h kexecdh.c kexecdhc.c kexecdhs.c readconf.c readconf.h]
     [servconf.c servconf.h ssh_config.5 sshconnect2.c sshd.c sshd_config.5]
     add a KexAlgorithms knob to the client and server configuration to allow
     selection of which key exchange methods are used by ssh(1) and sshd(8)
     and their order of preference.
     ok markus@

1 files changed, 17 insertions, 1 deletions

diff --git a/readconf.c b/readconf.c
index 586422930..da7efd193 100644
--- a/readconf.c
+++ b/readconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.c,v 1.188 2010/08/31 11:54:45 djm Exp $ */
+/* $OpenBSD: readconf.c,v 1.189 2010/09/22 05:01:29 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -132,6 +132,7 @@ typedef enum {
         oHashKnownHosts,
         oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand,
         oVisualHostKey, oUseRoaming, oZeroKnowledgePasswordAuthentication,
+        oKexAlgorithms,
         oDeprecated, oUnsupported
 } OpCodes;
 
@@ -240,6 +241,7 @@ static struct {
 #else
         { "zeroknowledgepasswordauthentication", oUnsupported },
 #endif
+        { "kexalgorithms", oKexAlgorithms },
 
         { NULL, oBadOption }
 };
@@ -699,6 +701,18 @@ parse_int:
                         options->macs = xstrdup(arg);
                 break;
 
+        case oKexAlgorithms:
+                arg = strdelim(&s);
+                if (!arg || *arg == '\0')
+                        fatal("%.200s line %d: Missing argument.",
+                            filename, linenum);
+                if (!kex_names_valid(arg))
+                        fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
+                            filename, linenum, arg ? arg : "<NONE>");
+                if (*activep && options->kex_algorithms == NULL)
+                        options->kex_algorithms = xstrdup(arg);
+                break;
+
         case oHostKeyAlgorithms:
                 arg = strdelim(&s);
                 if (!arg || *arg == '\0')
@@ -1078,6 +1092,7 @@ initialize_options(Options * options)
         options->cipher = -1;
         options->ciphers = NULL;
         options->macs = NULL;
+        options->kex_algorithms = NULL;
         options->hostkeyalgorithms = NULL;
         options->protocol = SSH_PROTO_UNKNOWN;
         options->num_identity_files = 0;
@@ -1191,6 +1206,7 @@ fill_default_options(Options * options)
                 options->cipher = SSH_CIPHER_NOT_SET;
         /* options->ciphers, default set in myproposals.h */
         /* options->macs, default set in myproposals.h */
+        /* options->kex_algorithms, default set in myproposals.h */
         /* options->hostkeyalgorithms, default set in myproposals.h */
         if (options->protocol == SSH_PROTO_UNKNOWN)
                 options->protocol = SSH_PROTO_2;