src/initscripts/helper/aws-setup

   1 #!/bin/bash
   2
   3 . /etc/sysconfig/rc
   4 . ${rc_functions}
   5
   6 # Set PATH to find our own executables
   7 export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
   8
   9 get() {
  10         local file="${1}"
  11
  12         wget -qO - "http://169.254.169.254/latest/${file}"
  13 }
  14
  15 to_address() {
  16         local n="${1}"
  17
  18         local o1=$(( (n & 0xff000000) >> 24 ))
  19         local o2=$(( (n & 0xff0000) >> 16 ))
  20         local o3=$(( (n & 0xff00) >> 8 ))
  21         local o4=$(( (n & 0xff) ))
  22
  23         printf "%d.%d.%d.%d\n" "${o1}" "${o2}" "${o3}" "${o4}"
  24 }
  25
  26 to_integer() {
  27         local address="${1}"
  28
  29         local integer=0
  30
  31         local i
  32         for i in ${address//\./ }; do
  33                 integer=$(( (integer << 8) + i ))
  34         done
  35
  36         printf "%d\n" "${integer}"
  37 }
  38
  39 prefix2netmask() {
  40         local prefix=${1}
  41
  42         local zeros=$(( 32 - prefix ))
  43         local netmask=0
  44
  45         local i
  46         for (( i=0; i<${zeros}; i++ )); do
  47                 netmask=$(( (netmask << 1) ^ 1 ))
  48         done
  49
  50         to_address "$(( netmask ^ 0xffffffff ))"
  51 }
  52
  53 import_aws_configuration() {
  54         local instance_id="$(get meta-data/instance-id)"
  55
  56         boot_mesg "Importing AWS configuration for instance ${instance_id}..."
  57
  58         # Store instance ID
  59         echo "${instance_id}" > /var/run/aws-instance-id
  60
  61         # Initialise system settings
  62         local hostname=$(get meta-data/local-hostname)
  63
  64         # Set hostname
  65         if ! grep -q "^HOSTNAME=" /var/ipfire/main/settings; then
  66                 echo "HOSTNAME=${hostname%%.*}" >> /var/ipfire/main/settings
  67         fi
  68
  69         # Set domainname
  70         if ! grep -q "^DOMAINNAME=" /var/ipfire/main/settings; then
  71                 echo "DOMAINNAME=${hostname#*.}" >> /var/ipfire/main/settings
  72         fi
  73
  74         # Create setup user
  75         if ! getent passwd setup &>/dev/null; then
  76                 useradd setup -s /usr/bin/run-setup -g nobody -m
  77
  78                 # Unlock the account
  79                 usermod -p "x" setup
  80         fi
  81
  82         # Import SSH keys for setup user
  83         local line
  84         for line in $(get "meta-data/public-keys/"); do
  85                 local key_no="${line%=*}"
  86
  87                 local key="$(get meta-data/public-keys/${key_no}/openssh-key)"
  88                 if [ -n "${key}" ] && ! grep -q "^${key}$" "/home/setup/.ssh/authorized_keys" 2>/dev/null; then
  89                         mkdir -p "/home/setup/.ssh"
  90                         chmod 700 "/home/setup/.ssh"
  91                         chown setup.nobody "/home/setup/.ssh"
  92
  93                         echo "${key}" >> "/home/setup/.ssh/authorized_keys"
  94                         chmod 600 "/home/setup/.ssh/authorized_keys"
  95                         chown setup.nobody "/home/setup/.ssh/authorized_keys"
  96                 fi
  97         done
  98
  99         # Download the user-data script only on the first boot
 100         if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
 101                 # Download user-data
 102                 local user_data="$(get user-data)"
 103
 104                 # Save user-data script to be executed later
 105                 if [ "${user_data:0:2}" = "#!" ]; then
 106                         echo "${user_data}" > /tmp/aws-user-data.script
 107                         chmod 700 /tmp/aws-user-data.script
 108
 109                         # Run the user-data script
 110                         /tmp/aws-user-data.script &>/var/log/user-data.log
 111
 112                         # Delete the script right away
 113                         rm /tmp/aws-user-data.script
 114                 fi
 115         fi
 116
 117         # Import any DNS server settings
 118         eval $(/usr/local/bin/readhash <(grep -E "^DNS([0-9])=" /var/ipfire/ethernet/settings 2>/dev/null))
 119
 120         # Import network configuration
 121         # After this, no network connectivity will be available from this script due to the
 122         # renaming of the network interfaces for which they have to be shut down
 123         local config_type=1
 124         : > /var/ipfire/ethernet/settings
 125
 126         local mac
 127         for mac in $(get meta-data/network/interfaces/macs/); do
 128                 # Remove trailing slash
 129                 mac="${mac//\//}"
 130
 131                 local device_number="$(get "meta-data/network/interfaces/macs/${mac}/device-number")"
 132                 local interface_id="$(get "meta-data/network/interfaces/macs/${mac}/interface-id")"
 133
 134                 # First IPv4 address
 135                 local ipv4_address="$(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | head -n1)"
 136                 local ipv4_address_num="$(to_integer "${ipv4_address}")"
 137
 138                 # Get VPC subnet
 139                 local vpc="$(get "meta-data/network/interfaces/macs/${mac}/vpc-ipv4-cidr-block")"
 140                 local vpc_netaddress="${vpc%/*}"
 141                 local vpc_netaddress_num="$(to_integer "${vpc_netaddress}")"
 142
 143                 # Get subnet size
 144                 local subnet="$(get "meta-data/network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"
 145
 146                 local prefix="${subnet#*/}"
 147                 local netmask="$(prefix2netmask "${prefix}")"
 148                 local netmask_num="$(to_integer "${netmask}")"
 149
 150                 # Calculate the network and broadcast addresses
 151                 local netaddress="${subnet%/*}"
 152                 local netaddress_num="$(to_integer "${netaddress}")"
 153                 local broadcast="$(to_address $(( ipv4_address_num | (0xffffffff ^ netmask_num) )))"
 154
 155                 case "${device_number}" in
 156                         # RED
 157                         0)
 158                                 local interface_name="red0"
 159
 160                                 # The gateway is always the first IP address in the subnet
 161                                 local gateway="$(to_address $(( netaddress_num + 1 )))"
 162
 163                                 # The AWS internal DNS service is available on the second IP address of the VPC
 164                                 local dns1="$(to_address $(( vpc_netaddress_num + 2 )))"
 165                                 local dns2=
 166
 167                                 (
 168                                         echo "RED_TYPE=STATIC"
 169                                         echo "RED_DEV=${interface_name}"
 170                                         echo "RED_MACADDR=${mac}"
 171                                         echo "RED_DESCRIPTION='${interface_id}'"
 172                                         echo "RED_ADDRESS=${ipv4_address}"
 173                                         echo "RED_NETMASK=${netmask}"
 174                                         echo "RED_NETADDRESS=${netaddress}"
 175                                         echo "RED_BROADCAST=${broadcast}"
 176                                         echo "DEFAULT_GATEWAY=${gateway}"
 177                                         echo "DNS1=${DNS1:-${dns1}}"
 178                                         echo "DNS2=${DNS2:-${dns2}}"
 179                                 ) >> /var/ipfire/ethernet/settings
 180
 181                                 # Import aliases for RED
 182                                 for alias in $(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | tail -n +2); do
 183                                         echo "${alias},on,"
 184                                 done > /var/ipfire/ethernet/aliases
 185                                 ;;
 186
 187                         # GREEN
 188                         1)
 189                                 local interface_name="green0"
 190
 191                                 (
 192                                         echo "GREEN_DEV=${interface_name}"
 193                                         echo "GREEN_MACADDR=${mac}"
 194                                         echo "GREEN_DESCRIPTION='${interface_id}'"
 195                                         echo "GREEN_ADDRESS=${ipv4_address}"
 196                                         echo "GREEN_NETMASK=${netmask}"
 197                                         echo "GREEN_NETADDRESS=${netaddress}"
 198                                         echo "GREEN_BROADCAST=${broadcast}"
 199                                 ) >> /var/ipfire/ethernet/settings
 200                                 ;;
 201
 202                         # ORANGE
 203                         2)
 204                                 local interface_name="orange0"
 205                                 config_type=2
 206
 207                                 (
 208                                         echo "ORANGE_DEV=${interface_name}"
 209                                         echo "ORANGE_MACADDR=${mac}"
 210                                         echo "ORANGE_DESCRIPTION='${interface_id}'"
 211                                         echo "ORANGE_ADDRESS=${ipv4_address}"
 212                                         echo "ORANGE_NETMASK=${netmask}"
 213                                         echo "ORANGE_NETADDRESS=${netaddress}"
 214                                         echo "ORANGE_BROADCAST=${broadcast}"
 215                                 ) >> /var/ipfire/ethernet/settings
 216                                 ;;
 217                 esac
 218         done
 219
 220         # Save CONFIG_TYPE
 221         echo "CONFIG_TYPE=${config_type}" >> /var/ipfire/ethernet/settings
 222
 223
 224
 225         # Actions performed only on the very first start
 226         if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
 227                 # Enable SSH
 228                 sed -e "s/ENABLE_SSH=.*/ENABLE_SSH=on/g" -i /var/ipfire/remote/settings
 229
 230                 # Disable SSH password authentication
 231                 sed -e "s/^ENABLE_SSH_PASSWORDS=.*/ENABLE_SSH_PASSWORDS=off/" -i /var/ipfire/remote/settings
 232
 233                 # Enable SSH key authentication
 234                 sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings
 235
 236                 # Apply SSH settings
 237                 /usr/local/bin/sshctrl
 238
 239                 # Mark SSH to start immediately (but not right now)
 240                 touch /var/ipfire/remote/enablessh
 241                 chown nobody:nobody /var/ipfire/remote/enablessh
 242
 243                 # Firewall rules for SSH and WEBIF
 244                 (
 245                         echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 246                         echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 247                 ) >> /var/ipfire/firewall/input
 248
 249                 # This script has now completed the first steps of setup
 250                 touch /var/ipfire/main/firstsetup_ok
 251         fi
 252
 253         # All done
 254         echo_ok
 255 }
 256
 257 case "${reason}" in
 258         PREINIT)
 259                 # Bring up the interface
 260                 ip link set "${interface}" up
 261                 ;;
 262
 263         BOUND|RENEW|REBIND|REBOOT)
 264                 # Remove any previous IP addresses
 265                 ip addr flush dev "${interface}"
 266
 267                 # Add (or re-add) the new IP address
 268                 ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"
 269
 270                 # Add the default route
 271                 ip route add default via "${new_routers}"
 272
 273                 # Setup DNS
 274                 for domain_name_server in ${new_domain_name_servers}; do
 275                         echo "nameserver ${domain_name_server}"
 276                 done > /etc/resolv.conf
 277
 278                 # The system is online now
 279                 touch /var/ipfire/red/active
 280
 281                 # Import AWS configuration
 282                 import_aws_configuration
 283                 ;;
 284
 285         EXPIRE|FAIL|RELEASE|STOP)
 286                 # The system is no longer online
 287                 rm -f /var/ipfire/red/active
 288
 289                 # Remove all IP addresses
 290                 ip addr flush dev "${interface}"
 291
 292                 # Shut down the interface
 293                 ip link set "${interface}" down
 294                 ;;
 295
 296         *)
 297                 echo "Unhandled reason: ${reason}" >&2
 298                 exit 2
 299                 ;;
 300 esac
 301
 302 # Terminate
 303 exit 0