1 files changed, 111 insertions, 0 deletions

diff --git a/debian/patches/debian-banner.patch b/debian/patches/debian-banner.patch
new file mode 100644
index 000000000..7963b03ed
--- /dev/null
+++ b/debian/patches/debian-banner.patch
@@ -0,0 +1,111 @@
+From a18385c6866da4d69f46b64626ae5d60b4cf4a66 Mon Sep 17 00:00:00 2001
+From: Kees Cook <kees@debian.org>
+Date: Sun, 9 Feb 2014 16:10:06 +0000
+Subject: 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.
+
+Bug-Debian: http://bugs.debian.org/562048
+Forwarded: not-needed
+Last-Update: 2018-10-19
+
+Patch-Name: debian-banner.patch
+---
+ servconf.c    | 9 +++++++++
+ servconf.h    | 2 ++
+ sshd.c        | 3 ++-
+ sshd_config.5 | 5 +++++
+ 4 files changed, 18 insertions(+), 1 deletion(-)
+
+diff --git a/servconf.c b/servconf.c
+index 6caf1db38..c5dd617ef 100644
+--- a/servconf.c
++++ b/servconf.c
+@@ -182,6 +182,7 @@ initialize_server_options(ServerOptions *options)
+        options->fingerprint_hash = -1;
+        options->disable_forwarding = -1;
+        options->expose_userauth_info = -1;
++       options->debian_banner = -1;
+ }
+ 
+ /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
+@@ -417,6 +418,8 @@ fill_default_server_options(ServerOptions *options)
+                options->disable_forwarding = 0;
+        if (options->expose_userauth_info == -1)
+                options->expose_userauth_info = 0;
++       if (options->debian_banner == -1)
++               options->debian_banner = 1;
+ 
+        assemble_algorithms(options);
+ 
+@@ -504,6 +507,7 @@ typedef enum {
+        sStreamLocalBindMask, sStreamLocalBindUnlink,
+        sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
+        sExposeAuthInfo, sRDomain,
++       sDebianBanner,
+        sDeprecated, sIgnore, sUnsupported
+ } ServerOpCodes;
+ 
+@@ -661,6 +665,7 @@ static struct {
+        { "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL },
+        { "rdomain", sRDomain, SSHCFG_ALL },
+        { "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL },
++       { "debianbanner", sDebianBanner, SSHCFG_GLOBAL },
+        { NULL, sBadOption, 0 }
+ };
+ 
+@@ -2173,6 +2178,10 @@ process_server_config_line(ServerOptions *options, char *line,
+                        *charptr = xstrdup(arg);
+                break;
+ 
++       case sDebianBanner:
++               intptr = &options->debian_banner;
++               goto parse_flag;
++
+        case sDeprecated:
+        case sIgnore:
+        case sUnsupported:
+diff --git a/servconf.h b/servconf.h
+index 3b76da816..4e3c54042 100644
+--- a/servconf.h
++++ b/servconf.h
+@@ -212,6 +212,8 @@ typedef struct {
+        int     fingerprint_hash;
+        int     expose_userauth_info;
+        u_int64_t timing_secret;
++
++       int     debian_banner;
+ }       ServerOptions;
+ 
+ /* Information about the incoming connection as used by Match */
+diff --git a/sshd.c b/sshd.c
+index 9481272fc..d7e77d343 100644
+--- a/sshd.c
++++ b/sshd.c
+@@ -384,7 +384,8 @@ sshd_exchange_identification(struct ssh *ssh, int sock_in, int sock_out)
+        char remote_version[256];       /* Must be at least as big as buf. */
+ 
+        xasprintf(&server_version_string, "SSH-%d.%d-%.100s%s%s\r\n",
+-           PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE,
++           PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
++           options.debian_banner ? SSH_RELEASE : SSH_RELEASE_MINIMUM,
+            *options.version_addendum == '\0' ? "" : " ",
+            options.version_addendum);
+ 
+diff --git a/sshd_config.5 b/sshd_config.5
+index e7e55dd71..37e6be38f 100644
+--- a/sshd_config.5
++++ b/sshd_config.5
+@@ -543,6 +543,11 @@ or
+ .Cm no .
+ The default is
+ .Cm yes .
++.It Cm DebianBanner
++Specifies whether the distribution-specified extra version suffix is
++included during initial protocol handshake.
++The default is
++.Cm yes .
+ .It Cm DenyGroups
+ This keyword can be followed by a list of group name patterns, separated
+ by spaces.