1 files changed, 79 insertions, 0 deletions

diff --git a/debian/preinst b/debian/preinst
new file mode 100644
index 000000000..320d4df2a
--- /dev/null
+++ b/debian/preinst
@@ -0,0 +1,79 @@
+#!/bin/sh -e
+
+action=$1
+version=$2
+
+if [ -d /etc/ssh-nonfree -a ! -d /etc/ssh ]; then
+  version=1.2.27
+fi
+
+if [ "$action" = upgrade -o "$action" = install ]
+then
+  # check if debconf is missing
+  if ! test -f /usr/share/debconf/confmodule
+  then
+    cat <<EOF
+
+WARNING: ssh's pre-configuration script relies on debconf to tell you
+about some problems that might prevent you from logging in if you are
+upgrading from the old, Non-free version of ssh.
+
+If this is a new installation, you don't need to worry about this.
+Just go ahead and install ssh (make sure to read .../ssh/README.Debian).
+
+If you are upgrading, but you have alternative ways of logging into
+the machine (i.e. you're sitting in front of it, or you have telnetd
+running), then you also don't need to worry too much, because you can
+fix it up afterwards if there's a problem.
+
+If you're upgrading from an older (non-free) version of ssh, and ssh
+is the only way you have to access this machine, then you should
+probably abort the installation of ssh, install debconf, and then
+retry the installation of ssh.
+
+EOF
+    echo -n "Do you want to install SSH anyway [yN]: "
+    read input
+    expr "$input" : '[Yy]' >/dev/null || exit 1
+
+    # work around for missing debconf
+    db_get() { : ; }
+    RET=true
+    if [ -d /etc/ssh-nonfree -a ! -d /etc/ssh ]; then
+      cp -a /etc/ssh-nonfree /etc/ssh
+    fi
+  else
+    # Source debconf library.
+    . /usr/share/debconf/confmodule
+    db_version 2.0
+  fi
+
+  db_get ssh/use_old_init_script
+  if [ "$RET" = "false" ]; then
+    echo "ssh config: Aborting because ssh/use_old_init_script = false" >&2
+    exit 1
+  fi
+
+  # deal with upgrading from pre-OpenSSH versions
+  key=/etc/ssh/ssh_host_key
+  export key
+  if [ -n "$version" ] && [ -x /usr/bin/ssh-keygen ] && [ -f $key ] &&
+     dpkg --compare-versions "$version" lt 1.2.28
+  then
+    # make sure that keys get updated to get rid of IDEA
+    #
+    # N.B. this only works because we've still got the old
+    # nonfree ssh-keygen at this point
+    #
+    # First, check if we need to bother
+    echo -en '\0\0' | 3<&0 sh -c \
+        'dd if=$key bs=1 skip=32 count=2 2>/dev/null | cmp -s - /dev/fd/3' || {
+      # this means that bytes 32&33 of the key were not both zero, in which
+      # case the key is encrypted, which we need to fix
+      chmod 600 $key
+      ssh-keygen -u -f $key >/dev/null
+    }
+  fi
+fi
+
+#DEBHELPER#