Add a "VersionAddendum" configuration setting for sshd which allows

anyone to easily change the part of the OpenSSH version after the main
version number.  The FreeBSD-specific version banner could be disabled
that way, for example:

# Call ourselves plain OpenSSH
VersionAddendum

crypto/openssh/servconf.c

@@ -223,7 +223,7 @@ typedef enum {
 	sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
 	sIgnoreUserKnownHosts, sHostDSAKeyFile, sCiphers, sProtocol, sPidFile,
 	sGatewayPorts, sDSAAuthentication, sConnectionsPerPeriod, sXAuthLocation,
-	sSubsystem, sMaxStartups
+	sSubsystem, sMaxStartups, sVersionAddendum
 } ServerOpCodes;
 
 /* Textual representation of the tokens. */
@@ -288,6 +288,7 @@ static struct {
 	{ "connectionsperperiod", sConnectionsPerPeriod },
 	{ "subsystem", sSubsystem },
 	{ "maxstartups", sMaxStartups },
+	{ "versionaddendum", sVersionAddendum },
 	{ NULL, 0 }
 };
 
@@ -736,6 +737,13 @@ read_server_config(ServerOptions *options, const char *filename)
 			intptr = &options->max_startups;
 			goto parse_int;
 
+		case sVersionAddendum:
+			ssh_version_set_addendum(strtok(cp, "\n"));
+			do
+				arg = strdelim(&cp);
+			while (arg != NULL && *arg != '\0');
+			break;
+
 		default:
 			fatal("%.200s line %d: Missing handler for opcode %s (%d)\n",
 				filename, linenum,arg, opcode);

crypto/openssh/version.c

@@ -0,0 +1,59 @@
+/*-
+ * Copyright (c) 2001 Brian Fundakowski Feldman
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 "version.h"
+#include "xmalloc.h"
+
+RCSID("$FreeBSD$");
+
+static char *version = NULL;
+
+const char *
+ssh_version_get(void) {
+
+	if (version == NULL)
+		version = xstrdup(SSH_VERSION_BASE " " SSH_VERSION_ADDENDUM);
+	return (version);
+}
+
+void
+ssh_version_set_addendum(const char *add) {
+	char *newvers;
+	size_t size;
+
+	if (add != NULL) {
+		size = strlen(SSH_VERSION_BASE) + 1 + strlen(add) + 1;
+		newvers = xmalloc(size);
+		snprintf(newvers, size, "%s %s", SSH_VERSION_BASE, add);
+	} else {
+		newvers = xstrdup(SSH_VERSION_BASE);
+	}
+	if (version != NULL)
+		xfree(version);
+	version = newvers;
+}

crypto/openssh/version.h

@@ -1,4 +1,12 @@
 /* $FreeBSD$ */
 /* $OpenBSD: version.h,v 1.13 2000/10/16 09:38:45 djm Exp $ */
 
-#define SSH_VERSION	"OpenSSH_2.3.0 green@FreeBSD.org 20010319"
+#ifndef	SSH_VERSION
+
+#define SSH_VERSION		(ssh_version_get())
+#define SSH_VERSION_BASE	"OpenSSH_2.3.0"
+#define	SSH_VERSION_ADDENDUM	"green@FreeBSD.org 20010319"
+
+const char *ssh_version_get(void);
+void ssh_version_set_addendum(const char *add);
+#endif /* SSH_VERSION */