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 the user-data script only on the first boot
 113         if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
 114                 # Download user-data
 115                 local user_data="$(get user-data)"
 116
 117                 # Save user-data script to be executed later
 118                 if [ "${user_data:0:2}" = "#!" ]; then
 119                         echo "${user_data}" > /tmp/aws-user-data.script
 120                         chmod 700 /tmp/aws-user-data.script
 121
 122                         # Run the user-data script
 123                         /tmp/aws-user-data.script
 124
 125                         # Delete the script right away
 126                         rm /tmp/aws-user-data.script
 127                 fi
 128         fi
 129
 130         # Import any DNS server settings
 131         eval $(/usr/local/bin/readhash <(grep -E "^DNS([0-9])=" /var/ipfire/ethernet/settings 2>/dev/null))
 132
 133         # Import network configuration
 134         # After this, no network connectivity will be available from this script due to the
 135         # renaming of the network interfaces for which they have to be shut down
 136         local config_type=1
 137         : > /var/ipfire/ethernet/settings
 138
 139         local mac
 140         for mac in $(get meta-data/network/interfaces/macs/); do
 141                 # Remove trailing slash
 142                 mac="${mac//\//}"
 143
 144                 local device_number="$(get "meta-data/network/interfaces/macs/${mac}/device-number")"
 145                 local interface_id="$(get "meta-data/network/interfaces/macs/${mac}/interface-id")"
 146
 147                 # First IPv4 address
 148                 local ipv4_address="$(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | head -n1)"
 149                 local ipv4_address_num="$(to_integer "${ipv4_address}")"
 150
 151                 # Get VPC subnet
 152                 local vpc="$(get "meta-data/network/interfaces/macs/${mac}/vpc-ipv4-cidr-block")"
 153                 local vpc_netaddress="${vpc%/*}"
 154                 local vpc_netaddress_num="$(to_integer "${vpc_netaddress}")"
 155
 156                 # Get subnet size
 157                 local subnet="$(get "meta-data/network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"
 158
 159                 local prefix="${subnet#*/}"
 160                 local netmask="$(prefix2netmask "${prefix}")"
 161                 local netmask_num="$(to_integer "${netmask}")"
 162
 163                 # Calculate the network and broadcast addresses
 164                 local netaddress="${subnet%/*}"
 165                 local netaddress_num="$(to_integer "${netaddress}")"
 166                 local broadcast="$(to_address $(( ipv4_address_num | (0xffffffff ^ netmask_num) )))"
 167
 168                 case "${device_number}" in
 169                         # RED
 170                         0)
 171                                 local interface_name="red0"
 172
 173                                 # The gateway is always the first IP address in the subnet
 174                                 local gateway="$(to_address $(( netaddress_num + 1 )))"
 175
 176                                 # The AWS internal DNS service is available on the second IP address of the VPC
 177                                 local dns1="$(to_address $(( vpc_netaddress_num + 2 )))"
 178                                 local dns2=
 179
 180                                 (
 181                                         echo "RED_TYPE=STATIC"
 182                                         echo "RED_DEV=${interface_name}"
 183                                         echo "RED_MACADDR=${mac}"
 184                                         echo "RED_DESCRIPTION='${interface_id}'"
 185                                         echo "RED_ADDRESS=${ipv4_address}"
 186                                         echo "RED_NETMASK=${netmask}"
 187                                         echo "RED_NETADDRESS=${netaddress}"
 188                                         echo "RED_BROADCAST=${broadcast}"
 189                                         echo "DEFAULT_GATEWAY=${gateway}"
 190                                         echo "DNS1=${DNS1:-${dns1}}"
 191                                         echo "DNS2=${DNS2:-${dns2}}"
 192                                 ) >> /var/ipfire/ethernet/settings
 193
 194                                 # Import aliases for RED
 195                                 for alias in $(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | tail -n +2); do
 196                                         echo "${alias},on,"
 197                                 done > /var/ipfire/ethernet/aliases
 198                                 ;;
 199
 200                         # GREEN
 201                         1)
 202                                 local interface_name="green0"
 203
 204                                 (
 205                                         echo "GREEN_DEV=${interface_name}"
 206                                         echo "GREEN_MACADDR=${mac}"
 207                                         echo "GREEN_DESCRIPTION='${interface_id}'"
 208                                         echo "GREEN_ADDRESS=${ipv4_address}"
 209                                         echo "GREEN_NETMASK=${netmask}"
 210                                         echo "GREEN_NETADDRESS=${netaddress}"
 211                                         echo "GREEN_BROADCAST=${broadcast}"
 212                                 ) >> /var/ipfire/ethernet/settings
 213                                 ;;
 214
 215                         # ORANGE
 216                         2)
 217                                 local interface_name="orange0"
 218                                 config_type=2
 219
 220                                 (
 221                                         echo "ORANGE_DEV=${interface_name}"
 222                                         echo "ORANGE_MACADDR=${mac}"
 223                                         echo "ORANGE_DESCRIPTION='${interface_id}'"
 224                                         echo "ORANGE_ADDRESS=${ipv4_address}"
 225                                         echo "ORANGE_NETMASK=${netmask}"
 226                                         echo "ORANGE_NETADDRESS=${netaddress}"
 227                                         echo "ORANGE_BROADCAST=${broadcast}"
 228                                 ) >> /var/ipfire/ethernet/settings
 229                                 ;;
 230                 esac
 231
 232                 # Rename interface
 233                 local interface="$(find_interface "${mac}")"
 234
 235                 if [ -n "${interface}" ] && [ -n "${interface_name}" ] && [ "${interface}" != "${interface_name}" ]; then
 236                         ip link set "${interface}" down
 237                         ip link set "${interface}" name "${interface_name}"
 238                 fi
 239         done
 240
 241         # Save CONFIG_TYPE
 242         echo "CONFIG_TYPE=${config_type}" >> /var/ipfire/ethernet/settings
 243
 244         # Actions performed only on the very first start
 245         if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
 246                 # Enable SSH
 247                 sed -e "s/ENABLE_SSH=.*/ENABLE_SSH=on/g" -i /var/ipfire/remote/settings
 248
 249                 # Disable SSH password authentication
 250                 sed -e "s/^ENABLE_SSH_PASSWORDS=.*/ENABLE_SSH_PASSWORDS=off/" -i /var/ipfire/remote/settings
 251
 252                 # Enable SSH key authentication
 253                 sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings
 254
 255                 # Apply SSH settings
 256                 /usr/local/bin/sshctrl
 257
 258                 # Mark SSH to start immediately (but not right now)
 259                 touch /var/ipfire/remote/enablessh
 260                 chown nobody:nobody /var/ipfire/remote/enablessh
 261
 262                 # Firewall rules for SSH and WEBIF
 263                 (
 264                         echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 265                         echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 266                 ) >> /var/ipfire/firewall/input
 267
 268                 # This script has now completed the first steps of setup
 269                 touch /var/ipfire/main/firstsetup_ok
 270         fi
 271
 272         # All done
 273         echo_ok
 274 }
 275
 276 case "${reason}" in
 277         PREINIT)
 278                 # Bring up the interface
 279                 ip link set "${interface}" up
 280                 ;;
 281
 282         BOUND|RENEW|REBIND|REBOOT)
 283                 # Remove any previous IP addresses
 284                 ip addr flush dev "${interface}"
 285
 286                 # Add (or re-add) the new IP address
 287                 ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"
 288
 289                 # Add the default route
 290                 ip route add default via "${new_routers}"
 291
 292                 # Setup DNS
 293                 for domain_name_server in ${new_domain_name_servers}; do
 294                         echo "nameserver ${domain_name_server}"
 295                 done > /etc/resolv.conf
 296
 297                 # The system is online now
 298                 touch /var/ipfire/red/active
 299
 300                 # Import AWS configuration
 301                 import_aws_configuration
 302                 ;;
 303
 304         EXPIRE|FAIL|RELEASE|STOP)
 305                 # The system is no longer online
 306                 rm -f /var/ipfire/red/active
 307
 308                 # Remove all IP addresses
 309                 ip addr flush dev "${interface}"
 310                 ;;
 311
 312         *)
 313                 echo "Unhandled reason: ${reason}" >&2
 314                 exit 2
 315                 ;;
 316 esac
 317
 318 # Terminate
 319 exit 0