Package: openssh-server
Version: 1:5.1p1-5
Severity: normal
When I configure PAM (in /etc/security/pam_env.conf) to supply a default value
for an environment variable that can be passed through a SSH connection, the
default always overrides the client's value.
Test case:
Clear /etc/default/locale
Append to /etc/security/pam_env.conf: LC_CTYPE DEFAULT="cs_CZ"
Check that LC_* is listed in AcceptEnv in /etc/ssh/sshd_config
Connect to the server from a client which has LC_CTYPE=cs_CZ.UTF8 set.
I expect that the shell on the server will have the client's LC_CTYPE,
but I got cs_CZ instead.
SSH passes the environment variable correctly (when I comment out the line
in pam_env.conf, LC_CTYPE is correct).
I suspect that the problem lies in interaction between sshd's environment
and PAM's environment. It is likely that sshd does not pass the connection's
environment to PAM env, so pam_env does not see the value supplied by the
client and sets it to the default, but SSH then blindly overwrites the
connection's environment by the PAM's values. [I haven't checked that in the
source, though.]
-- System Information:
Debian Release: 5.0.6
APT prefers stable
APT policy: (990, 'stable')
Architecture: i386 (x86_64)
Kernel: Linux 2.6.33 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=C, LC_CTYPE=cs_CZ.ISO-8859-2 (charmap=ISO-8859-2)
Shell: /bin/sh linked to /bin/bash
Versions of packages openssh-server depends on:
ii adduser 3.110 add and remove users and groups
ii debconf [debcon 1.5.24 Debian configuration management sy
ii dpkg 1.14.29+b1 Debian package management system
ii libc6 2.7-18lenny4 GNU C Library: Shared libraries
ii libcomerr2 1.41.3-1 common error description library
ii libkrb53 1.6.dfsg.4~beta1-5lenny4 MIT Kerberos runtime libraries
ii libpam-modules 1.0.1-5+lenny1 Pluggable Authentication Modules f
ii libpam-runtime 1.0.1-5+lenny1 Runtime support for the PAM librar
ii libpam0g 1.0.1-5+lenny1 Pluggable Authentication Modules l
ii libselinux1 2.0.65-5 SELinux shared libraries
ii libssl0.9.8 0.9.8g-15+lenny8 SSL shared libraries
ii libwrap0 7.6.q-16 Wietse Venema's TCP wrappers libra
ii lsb-base 3.2-20 Linux Standard Base 3.2 init scrip
ii openssh-blackli 0.4.1 list of default blacklisted OpenSS
ii openssh-client 1:5.1p1-5 secure shell client, an rlogin/rsh
ii procps 1:3.2.7-11 /proc file system utilities
ii zlib1g 1:1.2.3.3.dfsg-12 compression library - runtime
Versions of packages openssh-server recommends:
pn openssh-blacklist-extra <none> (no description available)
ii xauth 1:1.0.3-2 X authentication utility
Versions of packages openssh-server suggests:
pn molly-guard <none> (no description available)
pn rssh <none> (no description available)
ii ssh-askpass 1:1.2.4.1-7 under X, asks user for a passphras
-- debconf information:
ssh/vulnerable_host_keys:
ssh/new_config: true
* ssh/use_old_init_script: true
ssh/encrypted_host_key_but_no_keygen:
* ssh/disable_cr_auth: false
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