postinst is in ssh-krb5 1:5.9p1-5ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
action="$1"
oldversion="$2"
if [ "$action" = configure ] ; then
if dpkg --compare-versions "$oldversion" lt-nl 1:4.3p2-7; then
# Replaced by /etc/init.d/ssh.
if [ -f /etc/init.d/ssh-krb5 ]; then
mv /etc/init.d/ssh-krb5 /etc/init.d/ssh-krb5.dpkg-old
update-rc.d ssh-krb5 remove || true
fi
fi
# Make sure that GSSAPI is enabled. If there is no uncommented GSSAPI
# configuration, uncomment any commented-out configuration if present
# (this will catch the case of a fresh install of openssh-server).
# Otherwise, add configuration turning on GSSAPIAuthentication and
# GSSAPIKeyExchange.
#
# If there is some configuration, we may be upgrading from ssh-krb5. It
# enabled GSSAPIKeyExchange without any configuration option. Therefore,
# if it isn't explicitly set, always enable it for compatible behavior
# with ssh-krb5.
if dpkg --compare-versions "$oldversion" ge 1:4.3p2-9; then
:
else
changed=
if grep -qi '^[ ]*GSSAPI' /etc/ssh/sshd_config ; then
if grep -qi '^[ ]*GSSAPIKeyExchange' /etc/ssh/sshd_config ; then
:
else
changed=true
cat >> /etc/ssh/sshd_config <<EOF
# GSSAPI key exchange (added by ssh-krb5 transitional package)
GSSAPIKeyExchange yes
EOF
fi
else
changed=true
if grep -qi '^#GSSAPI' /etc/ssh/sshd_config ; then
perl -pe 's/^\#(GSSAPI(Authentication|KeyExchange))\b.*/$1 yes/i' \
< /etc/ssh/sshd_config > /etc/ssh/sshd_config.dpkg-new
chown --reference /etc/ssh/sshd_config \
/etc/ssh/sshd_config.dpkg-new
chmod --reference /etc/ssh/sshd_config \
/etc/ssh/sshd_config.dpkg-new
mv /etc/ssh/sshd_config.dpkg-new /etc/ssh/sshd_config
else
cat >> /etc/ssh/sshd_config <<EOF
# GSSAPI authentication (added by ssh-krb5 transitional package)
GSSAPIAuthentication yes
GSSAPIKeyExchange yes
EOF
fi
fi
if [ -n "$changed" ] && [ -e /etc/init/ssh.conf ] ; then
stop ssh || true
start ssh || true
fi
fi
fi
exit 0
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