Description: Add DebianBanner server configuration option
 Setting this to "no" causes sshd to omit the Debian revision from its
 initial protocol handshake, for those scared by package-versioning.patch.
Author: Kees Cook <kees@debian.org>
Bug-Debian: http://bugs.debian.org/562048
Forwarded: not-needed
Last-Update: 2012-09-07

Index: b/servconf.c
===================================================================
--- a/servconf.c
+++ b/servconf.c
@@ -146,6 +146,7 @@
 	options->ip_qos_interactive = -1;
 	options->ip_qos_bulk = -1;
 	options->version_addendum = NULL;
+	options->debian_banner = -1;
 }
 
 void
@@ -295,6 +296,8 @@
 		options->ip_qos_bulk = IPTOS_THROUGHPUT;
 	if (options->version_addendum == NULL)
 		options->version_addendum = xstrdup("");
+	if (options->debian_banner == -1)
+		options->debian_banner = 1;
 	/* Turn privilege separation on by default */
 	if (use_privsep == -1)
 		use_privsep = PRIVSEP_NOSANDBOX;
@@ -343,6 +346,7 @@
 	sZeroKnowledgePasswordAuthentication, sHostCertificate,
 	sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
 	sKexAlgorithms, sIPQoS, sVersionAddendum,
+	sDebianBanner,
 	sDeprecated, sUnsupported
 } ServerOpCodes;
 
@@ -479,6 +483,7 @@
 	{ "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL },
 	{ "ipqos", sIPQoS, SSHCFG_ALL },
 	{ "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL },
+	{ "debianbanner", sDebianBanner, SSHCFG_GLOBAL },
 	{ NULL, sBadOption, 0 }
 };
 
@@ -1538,6 +1543,10 @@
 		}
 		return 0;
 
+	case sDebianBanner:
+		intptr = &options->debian_banner;
+		goto parse_int;
+
 	case sDeprecated:
 		logit("%s line %d: Deprecated option %s",
 		    filename, linenum, arg);
Index: b/servconf.h
===================================================================
--- a/servconf.h
+++ b/servconf.h
@@ -172,6 +172,7 @@
 	char   *authorized_principals_file;
 
 	char   *version_addendum;	/* Appended to SSH banner */
+	int	debian_banner;
 }       ServerOptions;
 
 /* Information about the incoming connection as used by Match */
Index: b/sshd.c
===================================================================
--- a/sshd.c
+++ b/sshd.c
@@ -425,7 +425,8 @@
 	}
 
 	xasprintf(&server_version_string, "SSH-%d.%d-%.100s%s%s%s",
-	    major, minor, SSH_RELEASE,
+	    major, minor,
+	    options.debian_banner ? SSH_RELEASE : SSH_RELEASE_MINIMUM,
 	    *options.version_addendum == '\0' ? "" : " ",
 	    options.version_addendum, newline);
 
Index: b/sshd_config.5
===================================================================
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -342,6 +342,11 @@
 .Dq no .
 The default is
 .Dq delayed .
+.It Cm DebianBanner
+Specifies whether the distribution-specified extra version suffix is
+included during initial protocol handshake.
+The default is
+.Dq yes .
 .It Cm DenyGroups
 This keyword can be followed by a list of group name patterns, separated
 by spaces.