packer/packer_templates/_common/sshd.sh

   1 #!/bin/sh -eux
   2
   3 #   Licensed under the Apache License, Version 2.0 (the "License");
   4 #   you may not use this file except in compliance with the License.
   5 #   You may obtain a copy of the License at
   6 #
   7 #       http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 #   Unless required by applicable law or agreed to in writing, software
  10 #   distributed under the License is distributed on an "AS IS" BASIS,
  11 #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 #   See the License for the specific language governing permissions and
  13 #   limitations under the License.
  14
  15 SSHD_CONFIG="/etc/ssh/sshd_config"
  16
  17 # ensure that there is a trailing newline before attempting to concatenate
  18 sed -i -e '$a\' "$SSHD_CONFIG"
  19
  20 USEDNS="UseDNS no"
  21 if grep -q -E "^[[:space:]]*UseDNS" "$SSHD_CONFIG"; then
  22     sed -i "s/^\s*UseDNS.*/${USEDNS}/" "$SSHD_CONFIG"
  23 else
  24     echo "$USEDNS" >>"$SSHD_CONFIG"
  25 fi
  26
  27 GSSAPI="GSSAPIAuthentication no"
  28 if grep -q -E "^[[:space:]]*GSSAPIAuthentication" "$SSHD_CONFIG"; then
  29     sed -i "s/^\s*GSSAPIAuthentication.*/${GSSAPI}/" "$SSHD_CONFIG"
  30 else
  31     echo "$GSSAPI" >>"$SSHD_CONFIG"
  32 fi