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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
From 4f52dcf6ce616f6e674d6af0ceebb3e2f6b147a3 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@debian.org>
Date: Sun, 9 Feb 2014 16:10:18 +0000
Subject: Various Debian-specific configuration changes
ssh: Enable ForwardX11Trusted, returning to earlier semantics which cause
fewer problems with existing setups (http://bugs.debian.org/237021).
ssh: Set 'SendEnv LANG LC_*' by default (http://bugs.debian.org/264024).
ssh: Enable HashKnownHosts by default to try to limit the spread of ssh
worms.
ssh: Enable GSSAPIAuthentication by default.
ssh: Include /etc/ssh/ssh_config.d/*.conf.
sshd: Enable PAM, disable KbdInteractiveAuthentication, and disable
PrintMotd.
sshd: Enable X11Forwarding.
sshd: Set 'AcceptEnv LANG LC_*' by default.
sshd: Change sftp subsystem path to /usr/lib/openssh/sftp-server.
sshd: Include /etc/ssh/sshd_config.d/*.conf.
regress: Run tests with 'UsePAM yes', to match sshd_config.
Document all of this.
Author: Russ Allbery <rra@debian.org>
Forwarded: not-needed
Last-Update: 2023-01-03
Patch-Name: debian-config.patch
---
readconf.c | 2 +-
regress/test-exec.sh | 1 +
ssh.1 | 24 ++++++++++++++++++++++++
ssh_config | 8 +++++++-
ssh_config.5 | 26 +++++++++++++++++++++++++-
sshd_config | 18 ++++++++++++------
sshd_config.5 | 29 +++++++++++++++++++++++++++++
7 files changed, 99 insertions(+), 9 deletions(-)
diff --git a/readconf.c b/readconf.c
index d68658185..720062bcc 100644
--- a/readconf.c
+++ b/readconf.c
@@ -2739,7 +2739,7 @@ fill_default_options(Options * options)
if (options->forward_x11 == -1)
options->forward_x11 = 0;
if (options->forward_x11_trusted == -1)
- options->forward_x11_trusted = 0;
+ options->forward_x11_trusted = 1;
if (options->forward_x11_timeout == -1)
options->forward_x11_timeout = 1200;
/*
diff --git a/regress/test-exec.sh b/regress/test-exec.sh
index ad627941f..56e98159c 100644
--- a/regress/test-exec.sh
+++ b/regress/test-exec.sh
@@ -609,6 +609,7 @@ cat << EOF > $OBJ/sshd_config
AcceptEnv _XXX_TEST_*
AcceptEnv _XXX_TEST
Subsystem sftp $SFTPSERVER
+ UsePAM yes
EOF
# This may be necessary if /usr/src and/or /usr/obj are group-writable,
diff --git a/ssh.1 b/ssh.1
index 0d56f3dc1..ddfe75b95 100644
--- a/ssh.1
+++ b/ssh.1
@@ -861,6 +861,16 @@ directive in
.Xr ssh_config 5
for more information.
.Pp
+(Debian-specific: X11 forwarding is not subjected to X11 SECURITY extension
+restrictions by default, because too many programs currently crash in this
+mode.
+Set the
+.Cm ForwardX11Trusted
+option to
+.Dq no
+to restore the upstream behaviour.
+This may change in future depending on client-side improvements.)
+.Pp
.It Fl x
Disables X11 forwarding.
.Pp
@@ -869,6 +879,20 @@ Enables trusted X11 forwarding.
Trusted X11 forwardings are not subjected to the X11 SECURITY extension
controls.
.Pp
+(Debian-specific: In the default configuration, this option is equivalent to
+.Fl X ,
+since
+.Cm ForwardX11Trusted
+defaults to
+.Dq yes
+as described above.
+Set the
+.Cm ForwardX11Trusted
+option to
+.Dq no
+to restore the upstream behaviour.
+This may change in future depending on client-side improvements.)
+.Pp
.It Fl y
Send log information using the
.Xr syslog 3
diff --git a/ssh_config b/ssh_config
index 16197d15d..92d06ef38 100644
--- a/ssh_config
+++ b/ssh_config
@@ -17,9 +17,12 @@
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.
-# Host *
+Include /etc/ssh/ssh_config.d/*.conf
+
+Host *
# ForwardAgent no
# ForwardX11 no
+# ForwardX11Trusted yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# GSSAPIAuthentication no
@@ -46,3 +49,6 @@
# ProxyCommand ssh -q -W %h:%p gateway.example.com
# RekeyLimit 1G 1h
# UserKnownHostsFile ~/.ssh/known_hosts.d/%k
+ SendEnv LANG LC_*
+ HashKnownHosts yes
+ GSSAPIAuthentication yes
diff --git a/ssh_config.5 b/ssh_config.5
index 41d4d7406..c2789a09d 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -71,6 +71,29 @@ Since the first obtained value for each parameter is used, more
host-specific declarations should be given near the beginning of the
file, and general defaults at the end.
.Pp
+Note that the Debian
+.Ic openssh-client
+package sets several options as standard in
+.Pa /etc/ssh/ssh_config
+which are not the default in
+.Xr ssh 1 :
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+.Cm Include /etc/ssh/ssh_config.d/*.conf
+.It
+.Cm SendEnv No LANG LC_*
+.It
+.Cm HashKnownHosts No yes
+.It
+.Cm GSSAPIAuthentication No yes
+.El
+.Pp
+.Pa /etc/ssh/ssh_config.d/*.conf
+files are included at the start of the system-wide configuration file, so
+options set there will override those in
+.Pa /etc/ssh/ssh_config.
+.Pp
The file contains keyword-argument pairs, one per line.
Lines starting with
.Ql #
@@ -901,11 +924,12 @@ elapsed.
.It Cm ForwardX11Trusted
If this option is set to
.Cm yes ,
+(the Debian-specific default),
remote X11 clients will have full access to the original X11 display.
.Pp
If this option is set to
.Cm no
-(the default),
+(the upstream default),
remote X11 clients will be considered untrusted and prevented
from stealing or tampering with data belonging to trusted X11
clients.
diff --git a/sshd_config b/sshd_config
index ecfe8d026..677f97d5d 100644
--- a/sshd_config
+++ b/sshd_config
@@ -10,6 +10,8 @@
# possible, but leave them commented. Uncommented options override the
# default value.
+Include /etc/ssh/sshd_config.d/*.conf
+
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
@@ -57,8 +59,9 @@ AuthorizedKeysFile .ssh/authorized_keys
#PasswordAuthentication yes
#PermitEmptyPasswords no
-# Change to no to disable s/key passwords
-#KbdInteractiveAuthentication yes
+# Change to yes to enable challenge-response passwords (beware issues with
+# some PAM modules and threads)
+KbdInteractiveAuthentication no
# Kerberos options
#KerberosAuthentication no
@@ -81,16 +84,16 @@ AuthorizedKeysFile .ssh/authorized_keys
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and KbdInteractiveAuthentication to 'no'.
-#UsePAM no
+UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
-#X11Forwarding no
+X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
-#PrintMotd yes
+PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
@@ -107,8 +110,11 @@ AuthorizedKeysFile .ssh/authorized_keys
# no default banner path
#Banner none
+# Allow client to pass locale environment variables
+AcceptEnv LANG LC_*
+
# override default of no subsystems
-Subsystem sftp /usr/libexec/sftp-server
+Subsystem sftp /usr/lib/openssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
diff --git a/sshd_config.5 b/sshd_config.5
index 0e8891c4f..12083e839 100644
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -56,6 +56,35 @@ Arguments may optionally be enclosed in double quotes
.Pq \&"
in order to represent arguments containing spaces.
.Pp
+Note that the Debian
+.Ic openssh-server
+package sets several options as standard in
+.Pa /etc/ssh/sshd_config
+which are not the default in
+.Xr sshd 8 :
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+.Cm Include /etc/ssh/sshd_config.d/*.conf
+.It
+.Cm KbdInteractiveAuthentication No no
+.It
+.Cm X11Forwarding No yes
+.It
+.Cm PrintMotd No no
+.It
+.Cm AcceptEnv No LANG LC_*
+.It
+.Cm Subsystem No sftp /usr/lib/openssh/sftp-server
+.It
+.Cm UsePAM No yes
+.El
+.Pp
+.Pa /etc/ssh/sshd_config.d/*.conf
+files are included at the start of the configuration file, so options set
+there will override those in
+.Pa /etc/ssh/sshd_config.
+.Pp
The possible
keywords and their meanings are as follows (note that
keywords are case-insensitive and arguments are case-sensitive):
|
