plc.d/ssl

   1 #!/bin/bash
   2 #
   3 # priority: 400
   4 #
   5 # Generate SSL certificates
   6 #
   7 # Mark Huang <mlhuang@cs.princeton.edu>
   8 # Copyright (C) 2006 The Trustees of Princeton University
   9 #
  10 # $Id$
  11 #
  12
  13 # Source function library and configuration
  14 . /etc/plc.d/functions
  15 . /etc/planetlab/plc_config
  16
  17 # Be verbose
  18 set -x
  19
  20 # Print the CNAME of an SSL certificate
  21 ssl_cname ()
  22 {
  23     openssl x509 -noout -in $1 -subject | \
  24         sed -n -e 's@.*/CN=\([^/]*\).*@\1@p' | \
  25         lower
  26 }
  27
  28 backup_file ()
  29 {
  30     filepath=$1
  31     filename=$(basename ${filepath})
  32     dir=$(dirname ${filepath})
  33     mv -f ${filepath} ${dir}/${filename}-`date +%Y-%m-%d-%H-%M-%S`.bak
  34 }
  35
  36 # Verify a certificate. If invalid, generate a new self-signed
  37 # certificate.
  38 verify_or_generate_certificate() {
  39     crt=$1
  40     key=$2
  41     ca=$3
  42     cname=$(lower $4)
  43
  44     # If the CA certificate does not exist, assume that the
  45     # certificate is self-signed.
  46     if [ ! -f $ca ] ; then
  47         cp -a $crt $ca
  48     fi
  49
  50     if [ -f $crt ] ; then
  51         # Check if certificate is valid
  52         verify=$(openssl verify -CAfile $ca $crt)
  53         # Backup if invalid or if the subject has changed
  54         if grep -q "error" <<<$verify || \
  55             [ "$(ssl_cname $crt)" != "$cname" ] ; then
  56             backup_file $crt
  57             backup_file $ca
  58         fi
  59     fi
  60
  61     if [ ! -f $crt ] ; then
  62         # Set subject
  63         subj=
  64         if [ -n "$cname" ] ; then
  65             subj="$subj/CN=$cname"
  66         fi
  67
  68         # Generate new self-signed certificate
  69         mkdir -p $(dirname $crt)
  70         openssl req -new -x509 -days 3650 -set_serial $RANDOM \
  71             -batch -subj "$subj" \
  72             -nodes -keyout $key -out $crt
  73         check
  74
  75         # The certificate it self-signed, so it is its own CA
  76         cp -a $crt $ca
  77     fi
  78
  79     # Fix permissions
  80     chmod 644 $crt $ca
  81 }
  82
  83 case "$1" in
  84     start)
  85
  86         # Generate HTTPS certificates if necessary. We generate a
  87         # certificate for each enabled server with a different
  88         # hostname. These self-signed certificates may be overridden
  89         # later.
  90         MESSAGE=$"Generating SSL certificates for"
  91         dialog "$MESSAGE"
  92
  93         for server in WWW API BOOT MONITOR; do
  94             eval "a=\$PLC_${server}_ENABLED"
  95             echo $a
  96             if [ "$a" -ne 1 ] ; then
  97                 echo "Skipping"
  98                 continue
  99             fi
 100             dialog "$server"
 101             ssl_key=PLC_${server}_SSL_KEY
 102             ssl_crt=PLC_${server}_SSL_CRT
 103             ca_ssl_crt=PLC_${server}_CA_SSL_CRT
 104             hostname=PLC_${server}_HOST
 105
 106             # Check if we have already generated a certificate for
 107             # the same hostname.
 108             for previous_server in WWW API BOOT MONITOR; do
 109                 if [ "$server" = "$previous_server" ] ; then
 110                     break
 111                 fi
 112                 previous_ssl_key=PLC_${previous_server}_SSL_KEY
 113                 previous_ssl_crt=PLC_${previous_server}_SSL_CRT
 114                 previous_ca_ssl_crt=PLC_${previous_server}_CA_SSL_CRT
 115                 previous_hostname=PLC_${previous_server}_HOST
 116
 117                 if [ -f ${!previous_ssl_crt} ] && \
 118                     [ "$(ssl_cname ${!previous_ssl_crt})" = "${!hostname}" ] ; then
 119                     cp -a ${!previous_ssl_key} ${!ssl_key}
 120                     cp -a ${!previous_ssl_crt} ${!ssl_crt}
 121                     cp -a ${!previous_ca_ssl_crt} ${!ca_ssl_crt}
 122                     break
 123                 fi
 124             done
 125
 126             verify_or_generate_certificate \
 127                 ${!ssl_crt} ${!ssl_key} ${!ca_ssl_crt} \
 128                 ${!hostname}
 129         done
 130
 131         # Install HTTPS certificates into both /etc/pki (Fedora Core
 132         # 4) and /etc/httpd/conf (Fedora Core 2). If the API, boot,
 133         # and web servers are all running on the same machine, the web
 134         # server certificate takes precedence.
 135         for server in API BOOT MONITOR WWW; do
 136             enabled=PLC_${server}_ENABLED
 137             if [ "${!enabled}" != "1" ] ; then
 138                 continue
 139             fi
 140             ssl_key=PLC_${server}_SSL_KEY
 141             ssl_crt=PLC_${server}_SSL_CRT
 142
 143             symlink ${!ssl_crt} /etc/pki/tls/certs/localhost.crt
 144             symlink ${!ssl_key} /etc/pki/tls/private/localhost.key
 145             symlink ${!ssl_crt} /etc/httpd/conf/ssl.crt/server.crt
 146             symlink ${!ssl_key} /etc/httpd/conf/ssl.key/server.key
 147         done
 148
 149         result "$MESSAGE"
 150         ;;
 151 esac
 152
 153 exit $ERRORS