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-rw-r--r--debian/patches/debian-banner.patch111
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..ad842c23f
--- /dev/null
+++ b/debian/patches/debian-banner.patch
@@ -0,0 +1,111 @@
1From 02a077d3c8f8491d277b2291d5ae538379c7ed44 Mon Sep 17 00:00:00 2001
2From: Kees Cook <kees@debian.org>
3Date: Sun, 9 Feb 2014 16:10:06 +0000
4Subject: Add DebianBanner server configuration option
5
6Setting this to "no" causes sshd to omit the Debian revision from its
7initial protocol handshake, for those scared by package-versioning.patch.
8
9Bug-Debian: http://bugs.debian.org/562048
10Forwarded: not-needed
11Last-Update: 2015-11-29
12
13Patch-Name: debian-banner.patch
14---
15 servconf.c | 9 +++++++++
16 servconf.h | 2 ++
17 sshd.c | 3 ++-
18 sshd_config.5 | 5 +++++
19 4 files changed, 18 insertions(+), 1 deletion(-)
20
21diff --git a/servconf.c b/servconf.c
22index 49d3bdc8..1cee3d6c 100644
23--- a/servconf.c
24+++ b/servconf.c
25@@ -166,6 +166,7 @@ initialize_server_options(ServerOptions *options)
26 options->version_addendum = NULL;
27 options->fingerprint_hash = -1;
28 options->disable_forwarding = -1;
29+ options->debian_banner = -1;
30 }
31
32 /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
33@@ -339,6 +340,8 @@ fill_default_server_options(ServerOptions *options)
34 options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
35 if (options->disable_forwarding == -1)
36 options->disable_forwarding = 0;
37+ if (options->debian_banner == -1)
38+ options->debian_banner = 1;
39
40 assemble_algorithms(options);
41
42@@ -425,6 +428,7 @@ typedef enum {
43 sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
44 sStreamLocalBindMask, sStreamLocalBindUnlink,
45 sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
46+ sDebianBanner,
47 sDeprecated, sIgnore, sUnsupported
48 } ServerOpCodes;
49
50@@ -577,6 +581,7 @@ static struct {
51 { "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL },
52 { "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL },
53 { "disableforwarding", sDisableForwarding, SSHCFG_ALL },
54+ { "debianbanner", sDebianBanner, SSHCFG_GLOBAL },
55 { NULL, sBadOption, 0 }
56 };
57
58@@ -1860,6 +1865,10 @@ process_server_config_line(ServerOptions *options, char *line,
59 options->fingerprint_hash = value;
60 break;
61
62+ case sDebianBanner:
63+ intptr = &options->debian_banner;
64+ goto parse_int;
65+
66 case sDeprecated:
67 case sIgnore:
68 case sUnsupported:
69diff --git a/servconf.h b/servconf.h
70index 90dfa4c2..913a21b3 100644
71--- a/servconf.h
72+++ b/servconf.h
73@@ -191,6 +191,8 @@ typedef struct {
74 char *auth_methods[MAX_AUTH_METHODS];
75
76 int fingerprint_hash;
77+
78+ int debian_banner;
79 } ServerOptions;
80
81 /* Information about the incoming connection as used by Match */
82diff --git a/sshd.c b/sshd.c
83index 39e4699c..747beec8 100644
84--- a/sshd.c
85+++ b/sshd.c
86@@ -378,7 +378,8 @@ sshd_exchange_identification(struct ssh *ssh, int sock_in, int sock_out)
87 char remote_version[256]; /* Must be at least as big as buf. */
88
89 xasprintf(&server_version_string, "SSH-%d.%d-%.100s%s%s%s",
90- PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE,
91+ PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
92+ options.debian_banner ? SSH_RELEASE : SSH_RELEASE_MINIMUM,
93 *options.version_addendum == '\0' ? "" : " ",
94 options.version_addendum, newline);
95
96diff --git a/sshd_config.5 b/sshd_config.5
97index 283ba889..4ea0a9c3 100644
98--- a/sshd_config.5
99+++ b/sshd_config.5
100@@ -526,6 +526,11 @@ or
101 .Cm no .
102 The default is
103 .Cm yes .
104+.It Cm DebianBanner
105+Specifies whether the distribution-specified extra version suffix is
106+included during initial protocol handshake.
107+The default is
108+.Cm yes .
109 .It Cm DenyGroups
110 This keyword can be followed by a list of group name patterns, separated
111 by spaces.