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-rw-r--r--debian/patches/debian-config.patch238
1 files changed, 238 insertions, 0 deletions
diff --git a/debian/patches/debian-config.patch b/debian/patches/debian-config.patch
new file mode 100644
index 000000000..fe1e3f550
--- /dev/null
+++ b/debian/patches/debian-config.patch
@@ -0,0 +1,238 @@
1From 7abde40896668ce9debfe056c7dabc6a70ef7da4 Mon Sep 17 00:00:00 2001
2From: Colin Watson <cjwatson@debian.org>
3Date: Sun, 9 Feb 2014 16:10:18 +0000
4Subject: Various Debian-specific configuration changes
5
6ssh: Enable ForwardX11Trusted, returning to earlier semantics which cause
7fewer problems with existing setups (http://bugs.debian.org/237021).
8
9ssh: Set 'SendEnv LANG LC_*' by default (http://bugs.debian.org/264024).
10
11ssh: Enable HashKnownHosts by default to try to limit the spread of ssh
12worms.
13
14ssh: Enable GSSAPIAuthentication by default.
15
16sshd: Enable PAM, disable ChallengeResponseAuthentication, and disable
17PrintMotd.
18
19sshd: Enable X11Forwarding.
20
21sshd: Set 'AcceptEnv LANG LC_*' by default.
22
23sshd: Change sftp subsystem path to /usr/lib/openssh/sftp-server.
24
25Document all of this.
26
27Author: Russ Allbery <rra@debian.org>
28Forwarded: not-needed
29Last-Update: 2017-10-04
30
31Patch-Name: debian-config.patch
32---
33 readconf.c | 2 +-
34 ssh.1 | 21 +++++++++++++++++++++
35 ssh_config | 6 +++++-
36 ssh_config.5 | 19 ++++++++++++++++++-
37 sshd_config | 16 ++++++++++------
38 sshd_config.5 | 22 ++++++++++++++++++++++
39 6 files changed, 77 insertions(+), 9 deletions(-)
40
41diff --git a/readconf.c b/readconf.c
42index 16d2729dd..253574ce0 100644
43--- a/readconf.c
44+++ b/readconf.c
45@@ -2037,7 +2037,7 @@ fill_default_options(Options * options)
46 if (options->forward_x11 == -1)
47 options->forward_x11 = 0;
48 if (options->forward_x11_trusted == -1)
49- options->forward_x11_trusted = 0;
50+ options->forward_x11_trusted = 1;
51 if (options->forward_x11_timeout == -1)
52 options->forward_x11_timeout = 1200;
53 /*
54diff --git a/ssh.1 b/ssh.1
55index 24530e511..fd495da2c 100644
56--- a/ssh.1
57+++ b/ssh.1
58@@ -795,6 +795,16 @@ directive in
59 .Xr ssh_config 5
60 for more information.
61 .Pp
62+(Debian-specific: X11 forwarding is not subjected to X11 SECURITY extension
63+restrictions by default, because too many programs currently crash in this
64+mode.
65+Set the
66+.Cm ForwardX11Trusted
67+option to
68+.Dq no
69+to restore the upstream behaviour.
70+This may change in future depending on client-side improvements.)
71+.Pp
72 .It Fl x
73 Disables X11 forwarding.
74 .Pp
75@@ -803,6 +813,17 @@ Enables trusted X11 forwarding.
76 Trusted X11 forwardings are not subjected to the X11 SECURITY extension
77 controls.
78 .Pp
79+(Debian-specific: This option does nothing in the default configuration: it
80+is equivalent to
81+.Dq Cm ForwardX11Trusted No yes ,
82+which is the default as described above.
83+Set the
84+.Cm ForwardX11Trusted
85+option to
86+.Dq no
87+to restore the upstream behaviour.
88+This may change in future depending on client-side improvements.)
89+.Pp
90 .It Fl y
91 Send log information using the
92 .Xr syslog 3
93diff --git a/ssh_config b/ssh_config
94index 1ff999b68..6dd6ecf87 100644
95--- a/ssh_config
96+++ b/ssh_config
97@@ -17,9 +17,10 @@
98 # list of available options, their meanings and defaults, please see the
99 # ssh_config(5) man page.
100
101-# Host *
102+Host *
103 # ForwardAgent no
104 # ForwardX11 no
105+# ForwardX11Trusted yes
106 # PasswordAuthentication yes
107 # HostbasedAuthentication no
108 # GSSAPIAuthentication no
109@@ -45,3 +46,6 @@
110 # VisualHostKey no
111 # ProxyCommand ssh -q -W %h:%p gateway.example.com
112 # RekeyLimit 1G 1h
113+ SendEnv LANG LC_*
114+ HashKnownHosts yes
115+ GSSAPIAuthentication yes
116diff --git a/ssh_config.5 b/ssh_config.5
117index 4b42aab9d..d27655e15 100644
118--- a/ssh_config.5
119+++ b/ssh_config.5
120@@ -71,6 +71,22 @@ Since the first obtained value for each parameter is used, more
121 host-specific declarations should be given near the beginning of the
122 file, and general defaults at the end.
123 .Pp
124+Note that the Debian
125+.Ic openssh-client
126+package sets several options as standard in
127+.Pa /etc/ssh/ssh_config
128+which are not the default in
129+.Xr ssh 1 :
130+.Pp
131+.Bl -bullet -offset indent -compact
132+.It
133+.Cm SendEnv No LANG LC_*
134+.It
135+.Cm HashKnownHosts No yes
136+.It
137+.Cm GSSAPIAuthentication No yes
138+.El
139+.Pp
140 The file contains keyword-argument pairs, one per line.
141 Lines starting with
142 .Ql #
143@@ -721,11 +737,12 @@ elapsed.
144 .It Cm ForwardX11Trusted
145 If this option is set to
146 .Cm yes ,
147+(the Debian-specific default),
148 remote X11 clients will have full access to the original X11 display.
149 .Pp
150 If this option is set to
151 .Cm no
152-(the default),
153+(the upstream default),
154 remote X11 clients will be considered untrusted and prevented
155 from stealing or tampering with data belonging to trusted X11
156 clients.
157diff --git a/sshd_config b/sshd_config
158index 2c48105f8..ed8272f6d 100644
159--- a/sshd_config
160+++ b/sshd_config
161@@ -57,8 +57,9 @@ AuthorizedKeysFile .ssh/authorized_keys
162 #PasswordAuthentication yes
163 #PermitEmptyPasswords no
164
165-# Change to no to disable s/key passwords
166-#ChallengeResponseAuthentication yes
167+# Change to yes to enable challenge-response passwords (beware issues with
168+# some PAM modules and threads)
169+ChallengeResponseAuthentication no
170
171 # Kerberos options
172 #KerberosAuthentication no
173@@ -81,16 +82,16 @@ AuthorizedKeysFile .ssh/authorized_keys
174 # If you just want the PAM account and session checks to run without
175 # PAM authentication, then enable this but set PasswordAuthentication
176 # and ChallengeResponseAuthentication to 'no'.
177-#UsePAM no
178+UsePAM yes
179
180 #AllowAgentForwarding yes
181 #AllowTcpForwarding yes
182 #GatewayPorts no
183-#X11Forwarding no
184+X11Forwarding yes
185 #X11DisplayOffset 10
186 #X11UseLocalhost yes
187 #PermitTTY yes
188-#PrintMotd yes
189+PrintMotd no
190 #PrintLastLog yes
191 #TCPKeepAlive yes
192 #PermitUserEnvironment no
193@@ -107,8 +108,11 @@ AuthorizedKeysFile .ssh/authorized_keys
194 # no default banner path
195 #Banner none
196
197+# Allow client to pass locale environment variables
198+AcceptEnv LANG LC_*
199+
200 # override default of no subsystems
201-Subsystem sftp /usr/libexec/sftp-server
202+Subsystem sftp /usr/lib/openssh/sftp-server
203
204 # Example of overriding settings on a per-user basis
205 #Match User anoncvs
206diff --git a/sshd_config.5 b/sshd_config.5
207index 270805060..02e29cb6f 100644
208--- a/sshd_config.5
209+++ b/sshd_config.5
210@@ -56,6 +56,28 @@ Arguments may optionally be enclosed in double quotes
211 .Pq \&"
212 in order to represent arguments containing spaces.
213 .Pp
214+Note that the Debian
215+.Ic openssh-server
216+package sets several options as standard in
217+.Pa /etc/ssh/sshd_config
218+which are not the default in
219+.Xr sshd 8 :
220+.Pp
221+.Bl -bullet -offset indent -compact
222+.It
223+.Cm ChallengeResponseAuthentication No no
224+.It
225+.Cm X11Forwarding No yes
226+.It
227+.Cm PrintMotd No no
228+.It
229+.Cm AcceptEnv No LANG LC_*
230+.It
231+.Cm Subsystem No sftp /usr/lib/openssh/sftp-server
232+.It
233+.Cm UsePAM No yes
234+.El
235+.Pp
236 The possible
237 keywords and their meanings are as follows (note that
238 keywords are case-insensitive and arguments are case-sensitive):