1 files changed, 311 insertions, 0 deletions

diff --git a/debian/openssh-server.postinst b/debian/openssh-server.postinst
new file mode 100644
index 000000000..1da6cdfc5
--- /dev/null
+++ b/debian/openssh-server.postinst
@@ -0,0 +1,311 @@
+#!/bin/sh -e
+
+action="$1"
+oldversion="$2"
+
+. /usr/share/debconf/confmodule
+db_version 2.0
+
+umask 022
+
+if [ "$action" != configure ]
+  then
+  exit 0
+fi
+
+
+check_idea_key() {
+    #check for old host_key files using IDEA, which openssh does not support
+        if [ -f /etc/ssh/ssh_host_key ] ; then
+                if ssh-keygen -p -N '' -f /etc/ssh/ssh_host_key 2>&1 | \
+                                grep -q 'unknown cipher' 2>/dev/null ; then
+      mv /etc/ssh/ssh_host_key /etc/ssh/ssh_host_key.old
+      mv /etc/ssh/ssh_host_key.pub /etc/ssh/ssh_host_key.pub.old
+  fi
+        fi
+}
+
+
+get_config_option() {
+        option="$1"
+
+        [ -f /etc/ssh/sshd_config ] || return
+
+        # TODO: actually only one '=' allowed after option
+        perl -ne 'print if s/^[[:space:]]*'"$option"'[[:space:]=]+//i' \
+           /etc/ssh/sshd_config
+}
+
+
+set_config_option() {
+        option="$1"
+        value="$2"
+
+        perl -e '
+                $option = $ARGV[0]; $value = $ARGV[1]; $done = 0;
+                while (<STDIN>) {
+                        if (s/^\s*\Q$option\E\s+.*/$option $value/) {
+                                $done = 1;
+                        }
+                        print;
+                }
+                print "\n$option $value\n" unless $done;' \
+                "$option" "$value" \
+                < /etc/ssh/sshd_config > /etc/ssh/sshd_config.dpkg-new
+        chown --reference /etc/ssh/sshd_config /etc/ssh/sshd_config.dpkg-new
+        chmod --reference /etc/ssh/sshd_config /etc/ssh/sshd_config.dpkg-new
+        mv /etc/ssh/sshd_config.dpkg-new /etc/ssh/sshd_config
+}
+
+
+host_keys_required() {
+        hostkeys="$(get_config_option HostKey)"
+        if [ "$hostkeys" ]; then
+                echo "$hostkeys"
+        else
+                # No HostKey directives at all, so the server picks some
+                # defaults depending on the setting of Protocol.
+                protocol="$(get_config_option Protocol)"
+                [ "$protocol" ] || protocol=1,2
+                if echo "$protocol" | grep 1 >/dev/null; then
+                        echo /etc/ssh/ssh_host_key
+                fi
+                if echo "$protocol" | grep 2 >/dev/null; then
+                        echo /etc/ssh/ssh_host_rsa_key
+                        echo /etc/ssh/ssh_host_dsa_key
+                fi
+        fi
+}
+
+
+create_key() {
+        msg="$1"
+        shift
+        hostkeys="$1"
+        shift
+        file="$1"
+        shift
+
+        if echo "$hostkeys" | grep -x "$file" >/dev/null && \
+           [ ! -f "$file" ] ; then
+                echo -n $msg
+                ssh-keygen -q -f "$file" -N '' "$@"
+                echo
+        fi
+}
+
+
+create_keys() {
+        hostkeys="$(host_keys_required)"
+
+        create_key "Creating SSH1 key; this may take some time ..." \
+                "$hostkeys" /etc/ssh/ssh_host_key -t rsa1
+
+        create_key "Creating SSH2 RSA key; this may take some time ..." \
+                "$hostkeys" /etc/ssh/ssh_host_rsa_key -t rsa
+        create_key "Creating SSH2 DSA key; this may take some time ..." \
+                "$hostkeys" /etc/ssh/ssh_host_dsa_key -t dsa
+}
+
+
+check_password_auth() {
+        passwordauth="$(get_config_option PasswordAuthentication)"
+        crauth="$(get_config_option ChallengeResponseAuthentication)"
+        if [ "$passwordauth" = no ] && \
+           ([ -z "$crauth" ] || [ "$crauth" = yes ]); then
+                db_get ssh/disable_cr_auth
+                if [ "$RET" = true ]; then
+                        set_config_option ChallengeResponseAuthentication no
+                fi
+        fi
+}
+
+
+create_sshdconfig() {
+        if [ -e /etc/ssh/sshd_config ] ; then
+            if dpkg --compare-versions "$oldversion" lt-nl 1:1.3 ; then
+                db_get ssh/new_config
+                if [ "$RET" = "false" ] ; then return 0; fi
+            else
+                # Upgrade sshd configuration from a sane version.
+
+                if (dpkg --compare-versions "$oldversion" lt-nl 1:3.8p1-1 && \
+                    ! grep -iq ^UsePAM /etc/ssh/sshd_config) || \
+                   grep -Eiq '^(PAMAuthenticationViaKbdInt|RhostsAuthentication)' \
+                     /etc/ssh/sshd_config ; then
+                    # Upgrade from pre-3.7: UsePAM needed to maintain standard
+                    # Debian configuration.
+                    # Note that --compare-versions is sadly not reliable enough
+                    # here due to the package split of ssh into openssh-client
+                    # and openssh-server. The extra grep for some deprecated
+                    # options should with any luck be a good enough heuristic.
+                    echo -n 'Upgrading sshd_config (old version in .dpkg-old) ...'
+                    cp -a /etc/ssh/sshd_config /etc/ssh/sshd_config.dpkg-old
+                    perl -pe 's/^(PAMAuthenticationViaKbdInt|RhostsAuthentication)\b/#$1/i' \
+                        /etc/ssh/sshd_config > /etc/ssh/sshd_config.dpkg-new
+                    echo >> /etc/ssh/sshd_config.dpkg-new
+                    echo 'UsePAM yes' >> /etc/ssh/sshd_config.dpkg-new
+                    chown --reference /etc/ssh/sshd_config \
+                                      /etc/ssh/sshd_config.dpkg-new
+                    chmod --reference /etc/ssh/sshd_config \
+                                      /etc/ssh/sshd_config.dpkg-new
+                    mv /etc/ssh/sshd_config.dpkg-new /etc/ssh/sshd_config
+                    echo
+                fi
+
+                # An empty version means we're upgrading from before the
+                # package split, so check.
+                if dpkg --compare-versions "$oldversion" lt 1:3.8.1p1-11; then
+                    check_password_auth
+                fi
+
+                return 0
+            fi
+        fi
+
+        #Preserve old sshd_config before generating a new one
+        if [ -e /etc/ssh/sshd_config ] ; then 
+            mv /etc/ssh/sshd_config /etc/ssh/sshd_config.dpkg-old
+        fi
+
+        cat <<EOF > /etc/ssh/sshd_config
+# Package generated configuration file
+# See the sshd(8) manpage for details
+
+# What ports, IPs and protocols we listen for
+Port 22
+# Use these options to restrict which interfaces/protocols sshd will bind to
+#ListenAddress ::
+#ListenAddress 0.0.0.0
+EOF
+        db_get ssh/protocol2_only
+if [ "$RET" = "false" ]; then
+                cat <<EOF >> /etc/ssh/sshd_config
+Protocol 2,1
+# HostKeys for protocol version 1
+HostKey /etc/ssh/ssh_host_key
+# HostKeys for protocol version 2
+HostKey /etc/ssh/ssh_host_rsa_key
+HostKey /etc/ssh/ssh_host_dsa_key
+EOF
+else
+        cat <<EOF >> /etc/ssh/sshd_config
+Protocol 2
+# HostKeys for protocol version 2
+HostKey /etc/ssh/ssh_host_rsa_key
+HostKey /etc/ssh/ssh_host_dsa_key
+EOF
+fi
+
+        cat <<EOF >> /etc/ssh/sshd_config
+#Privilege Separation is turned on for security
+UsePrivilegeSeparation yes
+
+# Lifetime and size of ephemeral version 1 server key
+KeyRegenerationInterval 3600
+ServerKeyBits 768
+
+# Logging
+SyslogFacility AUTH
+LogLevel INFO
+
+# Authentication:
+LoginGraceTime 600
+PermitRootLogin yes
+StrictModes yes
+
+RSAAuthentication yes
+PubkeyAuthentication yes
+#AuthorizedKeysFile     %h/.ssh/authorized_keys
+
+# Don't read the user's ~/.rhosts and ~/.shosts files
+IgnoreRhosts yes
+# For this to work you will also need host keys in /etc/ssh_known_hosts
+RhostsRSAAuthentication no
+# similar for protocol version 2
+HostbasedAuthentication no
+# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
+#IgnoreUserKnownHosts yes
+
+# To enable empty passwords, change to yes (NOT RECOMMENDED)
+PermitEmptyPasswords no
+
+# Change to no to disable s/key passwords
+#ChallengeResponseAuthentication yes
+
+# Change to yes to enable tunnelled clear text passwords
+PasswordAuthentication no
+
+
+# To change Kerberos options
+#KerberosAuthentication no
+#KerberosOrLocalPasswd yes
+#AFSTokenPassing no
+#KerberosTicketCleanup no
+
+# Kerberos TGT Passing does only work with the AFS kaserver
+#KerberosTgtPassing yes
+
+X11Forwarding no
+X11DisplayOffset 10
+PrintMotd no
+PrintLastLog yes
+KeepAlive yes
+#UseLogin no
+
+#MaxStartups 10:30:60
+#Banner /etc/issue.net
+
+Subsystem       sftp    /usr/lib/sftp-server
+
+UsePAM yes
+EOF
+}
+
+fix_statoverride() {
+# Remove an erronous override for sshd (we should have overridden ssh)
+        if [ -x /usr/sbin/dpkg-statoverride ]; then
+                if dpkg-statoverride --list /usr/sbin/sshd >/dev/null ; then
+                        dpkg-statoverride --remove /usr/sbin/sshd
+                fi
+        fi
+}
+
+setup_sshd_user() {
+        if ! getent passwd sshd >/dev/null; then
+                adduser --quiet --system --no-create-home --home /var/run/sshd sshd
+        fi
+}
+
+fix_conffile_permissions() {
+        # Clean up after executable /etc/default/ssh in 1:3.5p1-5. dpkg
+        # doesn't do this for us; see bug #192981.
+        chmod 644 /etc/default/ssh
+}
+
+setup_init() {
+        if [ -x /etc/init.d/ssh ]; then
+                update-rc.d ssh defaults >/dev/null
+                if [ -x /usr/sbin/invoke-rc.d ]; then
+                        invoke-rc.d ssh restart
+                else
+                        /etc/init.d/ssh restart
+                fi
+        fi
+}
+
+
+create_sshdconfig
+check_idea_key
+create_keys
+fix_statoverride
+setup_sshd_user
+if dpkg --compare-versions "$2" lt 1:3.6.1p2-2; then
+    fix_conffile_permissions
+fi
+setup_init
+
+
+db_stop
+
+exit 0