1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
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
@@ -136,6 +136,7 @@
options->revoked_keys_file = NULL;
options->trusted_user_ca_keys = NULL;
options->authorized_principals_file = NULL;
+ options->debian_banner = -1;
}
void
@@ -278,6 +279,8 @@
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)
@@ -326,6 +329,7 @@
sUsePrivilegeSeparation, sAllowAgentForwarding,
sZeroKnowledgePasswordAuthentication, sHostCertificate,
sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
+ sDebianBanner,
sDeprecated, sUnsupported
} ServerOpCodes;
@@ -459,6 +463,7 @@
{ "revokedkeys", sRevokedKeys, SSHCFG_ALL },
{ "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL },
{ "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL },
+ { "debianbanner", sDebianBanner, SSHCFG_GLOBAL },
{ NULL, sBadOption, 0 }
};
@@ -1392,6 +1397,10 @@
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
@@ -340,6 +340,11 @@
.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.
|
