src/initscripts/helper/aws-setup

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