Debian Bug report logs - #590578
openssh-server: exits if ListenAddress is not available for binding

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Paul Wise <pabs@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: openssh-server: exits if ListenAddress is not available for binding

Date: Tue, 27 Jul 2010 09:54:46 -0400

[Message part 1 (text/plain, inline)]

Package: openssh-server
Version: 1:5.5p1-4
Severity: normal

The OpenSSH server exits with a fatal error if the ListenAddress is not
available for binding. In my use-case (ssh between my phone and laptop
using Ethernet over USB) I need SSH to be always running and bind to the
appropriate address as new interfaces become available and de-bind as
they disappear. I don't want SSH exposed to the WiFi and Ethernet
interfaces on my laptop so I use ListenAddress in sshd_config, the
reject option in dhclient.conf and a static IP on the USB connection so
that rogue networks can't get in on SSH. Probably the best solution to
this is to split ListenAddress add an AllowListenAddress and rename
ListenAddress to RequireListenAddress.

pabs@chianamo:~$ ifconfig usb0
usb0: error fetching interface information: Device not found
pabs@chianamo:~$ pgrep sshd
pabs@chianamo:~$ grep ^Listen /etc/ssh/sshd_config 
ListenAddress 192.168.0.200
pabs@chianamo:~$ sudo /etc/init.d/ssh start
Starting OpenBSD Secure Shell server: sshd.
pabs@chianamo:~$ pgrep sshd
pabs@chianamo:~$ sudo grep sshd /var/log/auth.log
Jul 27 09:36:03 chianamo sshd[8050]: error: Bind to port 2222 on 192.168.0.200 failed: Cannot assign requested address.
Jul 27 09:36:03 chianamo sshd[8050]: fatal: Cannot bind any address.
Jul 27 09:36:44 chianamo sudo:     pabs : TTY=pts/1 ; PWD=/home/pabs ; USER=root ; COMMAND=/bin/grep sshd /var/log/auth.log

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (700, 'testing'), (600, 'unstable'), (550, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.34-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages openssh-server depends on:
ii  adduser                 3.112            add and remove users and groups
ii  debconf [debconf-2.0]   1.5.33           Debian configuration management sy
ii  dpkg                    1.15.7.2         Debian package management system
ii  libc6                   2.11.2-2         Embedded GNU C Library: Shared lib
ii  libcomerr2              1.41.12-2        common error description library
ii  libgssapi-krb5-2        1.8.1+dfsg-5     MIT Kerberos runtime libraries - k
ii  libkrb5-3               1.8.1+dfsg-5     MIT Kerberos runtime libraries
ii  libpam-modules          1.1.1-3          Pluggable Authentication Modules f
ii  libpam-runtime          1.1.1-3          Runtime support for the PAM librar
ii  libpam0g                1.1.1-3          Pluggable Authentication Modules l
ii  libselinux1             2.0.94-1         SELinux runtime shared libraries
ii  libssl0.9.8             0.9.8o-1         SSL shared libraries
ii  libwrap0                7.6.q-19         Wietse Venema's TCP wrappers libra
ii  lsb-base                3.2-23.1         Linux Standard Base 3.2 init scrip
ii  openssh-blacklist       0.4.1            list of default blacklisted OpenSS
ii  openssh-client          1:5.5p1-4        secure shell (SSH) client, for sec
ii  procps                  1:3.2.8-9        /proc file system utilities
ii  zlib1g                  1:1.2.3.4.dfsg-3 compression library - runtime

Versions of packages openssh-server recommends:
ii  openssh-blacklist-extra       0.4.1      list of non-default blacklisted Op
ii  xauth                         1:1.0.4-1  X authentication utility

Versions of packages openssh-server suggests:
ii  ssh-askpass                  1:1.2.4.1-9 under X, asks user for a passphras

-- debconf information:
  ssh/vulnerable_host_keys:
  ssh/new_config: true
* ssh/use_old_init_script: true
  ssh/disable_cr_auth: false
  ssh/encrypted_host_key_but_no_keygen:

-- 
bye,
pabs

http://wiki.debian.org/PaulWise

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