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 # Verify a certificate. If invalid, generate a new self-signed
  29 # certificate.
  30 verify_or_generate_certificate() {
  31     crt=$1
  32     key=$2
  33     ca=$3
  34     cname=$(lower $4)
  35
  36     # If the CA certificate does not exist, assume that the
  37     # certificate is self-signed.
  38     if [ ! -f $ca ] ; then
  39         cp -a $crt $ca
  40     fi
  41
  42     if [ -f $crt ] ; then
  43         # Check if certificate is valid
  44         verify=$(openssl verify -CAfile $ca $crt)
  45         # Delete if invalid or if the subject has changed
  46         if grep -q "error" <<<$verify || \
  47             [ "$(ssl_cname $crt)" != "$cname" ] ; then
  48             rm -f $crt $ca
  49         fi
  50     fi
  51
  52     if [ ! -f $crt ] ; then
  53         # Set subject
  54         subj=
  55         if [ -n "$cname" ] ; then
  56             subj="$subj/CN=$cname"
  57         fi
  58
  59         # Generate new self-signed certificate
  60         mkdir -p $(dirname $crt)
  61         openssl req -new -x509 -days 3650 -set_serial $RANDOM \
  62             -batch -subj "$subj" \
  63             -nodes -keyout $key -out $crt
  64         check
  65
  66         # The certificate it self-signed, so it is its own CA
  67         cp -a $crt $ca
  68     fi
  69
  70     # Fix permissions
  71     chmod 644 $crt $ca
  72 }
  73
  74 case "$1" in
  75     start)
  76
  77         # Generate HTTPS certificates if necessary. We generate a
  78         # certificate for each enabled server with a different
  79         # hostname. These self-signed certificates may be overridden
  80         # later.
  81         MESSAGE=$"Generating SSL certificates for"
  82         dialog "$MESSAGE"
  83
  84         for server in WWW API BOOT ; do
  85             eval "a=\$PLC_${server}_ENABLED"
  86             echo $a
  87             if [ "$a" -ne 1 ] ; then
  88                 echo "Skipping"
  89                 continue
  90             fi
  91             dialog "$server"
  92         ssl_key=PLC_${server}_SSL_KEY
  93             ssl_crt=PLC_${server}_SSL_CRT
  94             ca_ssl_crt=PLC_${server}_CA_SSL_CRT
  95             hostname=PLC_${server}_HOST
  96
  97             # Check if we have already generated a certificate for
  98             # the same hostname.
  99             for previous_server in WWW API BOOT ; do
 100                 if [ "$server" = "$previous_server" ] ; then
 101                     break
 102                 fi
 103                 previous_ssl_key=PLC_${previous_server}_SSL_KEY
 104                 previous_ssl_crt=PLC_${previous_server}_SSL_CRT
 105                 previous_ca_ssl_crt=PLC_${previous_server}_CA_SSL_CRT
 106                 previous_hostname=PLC_${previous_server}_HOST
 107
 108                 if [ -f ${!previous_ssl_crt} ] && \
 109                     [ "$(ssl_cname ${!previous_ssl_crt})" = "${!hostname}" ] ; then
 110                     cp -a ${!previous_ssl_key} ${!ssl_key}
 111                     cp -a ${!previous_ssl_crt} ${!ssl_crt}
 112                     cp -a ${!previous_ca_ssl_crt} ${!ca_ssl_crt}
 113                     break
 114                 fi
 115             done
 116
 117             verify_or_generate_certificate \
 118                 ${!ssl_crt} ${!ssl_key} ${!ca_ssl_crt} \
 119                 ${!hostname}
 120         done
 121
 122         # Install HTTPS certificates into both /etc/pki (Fedora Core
 123         # 4) and /etc/httpd/conf (Fedora Core 2). If the API, boot,
 124         # and web servers are all running on the same machine, the web
 125         # server certificate takes precedence.
 126         for server in API BOOT WWW ; do
 127             enabled=PLC_${server}_ENABLED
 128             if [ "${!enabled}" != "1" ] ; then
 129                 continue
 130             fi
 131             ssl_key=PLC_${server}_SSL_KEY
 132             ssl_crt=PLC_${server}_SSL_CRT
 133
 134             symlink ${!ssl_crt} /etc/pki/tls/certs/localhost.crt
 135             symlink ${!ssl_key} /etc/pki/tls/private/localhost.key
 136             symlink ${!ssl_crt} /etc/httpd/conf/ssl.crt/server.crt
 137             symlink ${!ssl_key} /etc/httpd/conf/ssl.key/server.key
 138         done
 139
 140         result "$MESSAGE"
 141         ;;
 142 esac
 143
 144 exit $ERRORS