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: 2010-02-28

Index: b/servconf.c
===================================================================
--- a/servconf.c
+++ b/servconf.c
@@ -135,6 +135,7 @@
 	options->zero_knowledge_password_authentication = -1;
 	options->revoked_keys_file = NULL;
 	options->trusted_user_ca_keys = NULL;
+	options->debian_banner = -1;
 }
 
 void
@@ -277,6 +278,8 @@
 		options->permit_tun = SSH_TUNMODE_NO;
 	if (options->zero_knowledge_password_authentication == -1)
 		options->zero_knowledge_password_authentication = 0;
+	if (options->debian_banner == -1)
+		options->debian_banner = 1;
 
 	/* Turn privilege separation on by default */
 	if (use_privsep == -1)
@@ -325,6 +328,7 @@
 	sUsePrivilegeSeparation, sAllowAgentForwarding,
 	sZeroKnowledgePasswordAuthentication, sHostCertificate,
 	sRevokedKeys, sTrustedUserCAKeys,
+	sDebianBanner,
 	sDeprecated, sUnsupported
 } ServerOpCodes;
 
@@ -457,6 +461,7 @@
 	{ "hostcertificate", sHostCertificate, SSHCFG_GLOBAL },
 	{ "revokedkeys", sRevokedKeys, SSHCFG_ALL },
 	{ "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL },
+	{ "debianbanner", sDebianBanner, SSHCFG_GLOBAL },
 	{ NULL, sBadOption, 0 }
 };
 
@@ -1386,6 +1391,10 @@
 		charptr = &options->revoked_keys_file;
 		goto parse_filename;
 
+	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
@@ -157,6 +157,8 @@
 
 	int	num_permitted_opens;
 
+	int	debian_banner;
+
 	char   *chroot_directory;
 	char   *revoked_keys_file;
 	char   *trusted_user_ca_keys;
Index: b/sshd.c
===================================================================
--- a/sshd.c
+++ b/sshd.c
@@ -422,7 +422,8 @@
 		minor = PROTOCOL_MINOR_1;
 	}
 	snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s%s", major, minor,
-	    SSH_RELEASE, newline);
+	    options.debian_banner ? SSH_RELEASE : SSH_RELEASE_MINIMUM,
+	    newline);
 	server_version_string = xstrdup(buf);
 
 	/* Send our protocol version identification. */
Index: b/sshd_config.5
===================================================================
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -295,6 +295,11 @@
 .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.