conf_files/pl_boot

   1 #!/bin/sh
   2
   3 # Run gpg once to create default options
   4 GNUPGHOME=/root
   5 export GNUPGHOME
   6 /usr/bin/gpg --yes 2>/dev/null </dev/null
   7
   8 # if this file is present, cancel the boot (exit this script)
   9 CANCEL_BOOT_FLAG=/tmp/CANCEL_BOOT
  10
  11 # how many times to fail in attempting to contact primary server
  12 # before falling back to original. if the backup fails this many times
  13 # too, then the process is repeated started with the primary server
  14 ATTEMPTS_BEFORE_BACKUP=2
  15
  16 # where all the configuration files for contacting
  17 # the boot server are stored
  18 BOOT_DIR=/usr/boot/
  19
  20 # get the server we are going to be contacting
  21 BOOT_SERVER=`cat $BOOT_DIR/boot_server`
  22 BOOT_SERVER_PORT=`cat $BOOT_DIR/boot_server_port`
  23
  24 # the file to request from the boot server
  25 BOOT_SERVER_PATH=`cat $BOOT_DIR/boot_server_path`
  26
  27 # location of the cacert for this boot server
  28 BOOT_SERVER_CACERT=$BOOT_DIR/cacert.pem
  29
  30 # location of the gpg key ring to verify scripts
  31 BOOT_SERVER_GPG_KEYRING=$BOOT_DIR/pubring.gpg
  32
  33 # get the backup server we are going to be contacting
  34 BACKUP_BOOT_SERVER=`cat $BOOT_DIR/backup/boot_server`
  35 BACKUP_BOOT_SERVER_PORT=`cat $BOOT_DIR/backup/boot_server_port`
  36
  37 # the file to request from the backup boot server
  38 BACKUP_BOOT_SERVER_PATH=`cat $BOOT_DIR/backup/boot_server_path`
  39
  40 # location of the cacert for the backup boot server
  41 BACKUP_BOOT_SERVER_CACERT=$BOOT_DIR/backup/cacert.pem
  42
  43 # location of the gpg key ring for backup server to verify scripts
  44 BACKUP_BOOT_SERVER_GPG_KEYRING=$BOOT_DIR/backup/pubring.gpg
  45
  46 # location of a file containing this boot cd version
  47 BOOT_VERSION_FILE=/pl_version
  48
  49 # the locations of the downloaded scripts
  50 UNVERIFIED_SCRIPT=/tmp/bootscript.gpg
  51 VERIFIED_SCRIPT=/tmp/bootscript
  52
  53
  54 # --------------------------
  55
  56
  57 # now, contact the boot server, run the script, and do it over again.
  58 contact_count=0
  59
  60 # set to one when we are trying to contact backup server
  61 on_backup_server=0
  62
  63 # start out contacting the primary servers
  64 CONNECT_BOOT_SERVER=$BOOT_SERVER
  65 CONNECT_BOOT_SERVER_PORT=$BOOT_SERVER_PORT
  66 CONNECT_BOOT_SERVER_PATH=$BOOT_SERVER_PATH
  67 CONNECT_BOOT_SERVER_GPG_KEYRING=$BOOT_SERVER_GPG_KEYRING
  68 CONNECT_BOOT_SERVER_CACERT=$BOOT_SERVER_CACERT
  69
  70 while : ; do
  71
  72     if [[ -f $CANCEL_BOOT_FLAG ]]; then
  73         echo "pl_boot: got request to cancel boot, exiting"
  74         exit 0
  75     fi
  76
  77     if [[ $contact_count -ne 0 ]]; then
  78         echo "pl_boot: fetching new script in 30 seconds"
  79         /bin/sleep 30
  80     fi
  81
  82     ((contact_count++))
  83     if [[ $contact_count > $ATTEMPTS_BEFORE_BACKUP ]]; then
  84
  85         contact_count=0
  86
  87         if [[ $on_backup_server == 1 ]]; then
  88             echo "pl_boot: failed to contact backup server, trying primary."
  89
  90             on_backup_server=0
  91
  92             CONNECT_BOOT_SERVER=$BOOT_SERVER
  93             CONNECT_BOOT_SERVER_PORT=$BOOT_SERVER_PORT
  94             CONNECT_BOOT_SERVER_PATH=$BOOT_SERVER_PATH
  95             CONNECT_BOOT_SERVER_GPG_KEYRING=$BOOT_SERVER_GPG_KEYRING
  96             CONNECT_BOOT_SERVER_CACERT=$BOOT_SERVER_CACERT
  97         else
  98             echo "pl_boot: failed to contact primary server, trying backup."
  99
 100             on_backup_server=1
 101
 102             CONNECT_BOOT_SERVER=$BACKUP_BOOT_SERVER
 103             CONNECT_BOOT_SERVER_PORT=$BACKUP_BOOT_SERVER_PORT
 104             CONNECT_BOOT_SERVER_PATH=$BACKUP_BOOT_SERVER_PATH
 105             CONNECT_BOOT_SERVER_GPG_KEYRING=$BACKUP_BOOT_SERVER_GPG_KEYRING
 106             CONNECT_BOOT_SERVER_CACERT=$BACKUP_BOOT_SERVER_CACERT
 107         fi
 108     fi
 109
 110     # assemble the curl transaction
 111     CURL_CMD="/usr/bin/curl \
 112         --connect-timeout 60 \
 113         --max-time 600 \
 114         --form version=<$BOOT_VERSION_FILE \
 115         --form cmdline=</proc/cmdline \
 116         --form uptime=</proc/uptime \
 117         --form ifconfig=</tmp/ifconfig \
 118         --form nonce=</tmp/nonce \
 119         --location \
 120         --output $UNVERIFIED_SCRIPT \
 121         --sslv3  \
 122         --silent \
 123         --show-error \
 124         --fail \
 125         --stderr /tmp/curl_errors \
 126         --cacert $CONNECT_BOOT_SERVER_CACERT \
 127    https://$CONNECT_BOOT_SERVER:$CONNECT_BOOT_SERVER_PORT/$CONNECT_BOOT_SERVER_PATH"
 128
 129     # assemble the gpg command line
 130     GPG_CMD="/usr/bin/gpg \
 131         --no-default-keyring \
 132         --keyring $CONNECT_BOOT_SERVER_GPG_KEYRING \
 133         --output $VERIFIED_SCRIPT \
 134         --always-trust \
 135         --decrypt $UNVERIFIED_SCRIPT"
 136
 137     echo "pl_boot: generating new nonce"
 138     /usr/bin/head --bytes=32 /dev/urandom | \
 139         /usr/bin/od -tx1 -An --width=32 | \
 140         /bin/sed 's/ //g' > /tmp/nonce
 141
 142     echo "pl_boot: fetching script from boot server $CONNECT_BOOT_SERVER"
 143     rm -f $UNVERIFIED_SCRIPT
 144     $CURL_CMD
 145     curl_err=$?
 146     if [ $curl_err -ne 0 ]; then
 147         echo "pl_boot: curl request failed with error $curl_err:"
 148         cat /tmp/curl_errors
 149         echo
 150         continue
 151     fi
 152
 153     echo "pl_boot: verifying downloaded script"
 154     rm -f $VERIFIED_SCRIPT
 155     $GPG_CMD 2> /tmp/gpg_errors
 156     if [ $? -ne 0 ]; then
 157         echo "pl_boot: failed to verify file:"
 158         cat /tmp/gpg_errors
 159         echo
 160         continue
 161     fi
 162     echo "pl_boot: decrypted and verified script succesfully"
 163
 164     echo "pl_boot: handing control to download script"
 165     rm -f $UNVERIFIED_SCRIPT
 166     chmod +x $VERIFIED_SCRIPT
 167     $VERIFIED_SCRIPT
 168
 169     echo "pl_boot: downloaded script has returned"
 170 done
 171
 172 echo "pl_boot: automatic boot process canceled by user"