src/initscripts/helper/aws-setup

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2022  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 . /etc/sysconfig/rc
  23 . ${rc_functions}
  24
  25 # Set PATH to find our own executables
  26 export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
  27
  28 # AWS supports an MTU of up to 9001 bytes
  29 DEFAULT_MTU=9001
  30
  31 get() {
  32         local file="${1}"
  33
  34         wget -qO - "http://169.254.169.254/latest/${file}"
  35 }
  36
  37 to_address() {
  38         local n="${1}"
  39
  40         local o1=$(( (n & 0xff000000) >> 24 ))
  41         local o2=$(( (n & 0xff0000) >> 16 ))
  42         local o3=$(( (n & 0xff00) >> 8 ))
  43         local o4=$(( (n & 0xff) ))
  44
  45         printf "%d.%d.%d.%d\n" "${o1}" "${o2}" "${o3}" "${o4}"
  46 }
  47
  48 to_integer() {
  49         local address="${1}"
  50
  51         local integer=0
  52
  53         local i
  54         for i in ${address//\./ }; do
  55                 integer=$(( (integer << 8) + i ))
  56         done
  57
  58         printf "%d\n" "${integer}"
  59 }
  60
  61 prefix2netmask() {
  62         local prefix=${1}
  63
  64         local zeros=$(( 32 - prefix ))
  65         local netmask=0
  66
  67         local i
  68         for (( i=0; i<${zeros}; i++ )); do
  69                 netmask=$(( (netmask << 1) ^ 1 ))
  70         done
  71
  72         to_address "$(( netmask ^ 0xffffffff ))"
  73 }
  74
  75 import_aws_configuration() {
  76         local instance_id="$(get meta-data/instance-id)"
  77
  78         boot_mesg "Importing AWS configuration for instance ${instance_id}..."
  79
  80         # Store instance ID
  81         echo "${instance_id}" > /var/run/aws-instance-id
  82
  83         # Initialise system settings
  84         local hostname=$(get meta-data/local-hostname)
  85
  86         # Set hostname
  87         if ! grep -q "^HOSTNAME=" /var/ipfire/main/settings; then
  88                 echo "HOSTNAME=${hostname%%.*}" >> /var/ipfire/main/settings
  89         fi
  90
  91         # Set domainname
  92         if ! grep -q "^DOMAINNAME=" /var/ipfire/main/settings; then
  93                 echo "DOMAINNAME=${hostname#*.}" >> /var/ipfire/main/settings
  94         fi
  95
  96         # Create setup user
  97         if ! getent passwd setup &>/dev/null; then
  98                 useradd setup -s /usr/bin/run-setup -g nobody -m
  99
 100                 # Unlock the account
 101                 usermod -p "x" setup
 102         fi
 103
 104         # Import SSH keys for setup user
 105         local line
 106         for line in $(get "meta-data/public-keys/"); do
 107                 local key_no="${line%=*}"
 108
 109                 local key="$(get meta-data/public-keys/${key_no}/openssh-key)"
 110                 if [ -n "${key}" ] && ! grep -q "^${key}$" "/home/setup/.ssh/authorized_keys" 2>/dev/null; then
 111                         mkdir -p "/home/setup/.ssh"
 112                         chmod 700 "/home/setup/.ssh"
 113                         chown setup.nobody "/home/setup/.ssh"
 114
 115                         echo "${key}" >> "/home/setup/.ssh/authorized_keys"
 116                         chmod 600 "/home/setup/.ssh/authorized_keys"
 117                         chown setup.nobody "/home/setup/.ssh/authorized_keys"
 118                 fi
 119         done
 120
 121         # Import network configuration
 122         # After this, no network connectivity will be available from this script due to the
 123         # renaming of the network interfaces for which they have to be shut down
 124         local config_type=1
 125         : > /var/ipfire/ethernet/settings
 126
 127         local mac
 128         for mac in $(get meta-data/network/interfaces/macs/); do
 129                 # Remove trailing slash
 130                 mac="${mac//\//}"
 131
 132                 local device_number="$(get "meta-data/network/interfaces/macs/${mac}/device-number")"
 133                 local interface_id="$(get "meta-data/network/interfaces/macs/${mac}/interface-id")"
 134
 135                 # First IPv4 address
 136                 local ipv4_address="$(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | head -n1)"
 137                 local ipv4_address_num="$(to_integer "${ipv4_address}")"
 138
 139                 # Get VPC subnet
 140                 local vpc="$(get "meta-data/network/interfaces/macs/${mac}/vpc-ipv4-cidr-block")"
 141                 local vpc_netaddress="${vpc%/*}"
 142                 local vpc_netaddress_num="$(to_integer "${vpc_netaddress}")"
 143
 144                 # Get subnet size
 145                 local subnet="$(get "meta-data/network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"
 146
 147                 local prefix="${subnet#*/}"
 148                 local netmask="$(prefix2netmask "${prefix}")"
 149
 150                 # Calculate the network and broadcast addresses
 151                 local netaddress="${subnet%/*}"
 152                 local netaddress_num="$(to_integer "${netaddress}")"
 153
 154                 case "${device_number}" in
 155                         # RED
 156                         0)
 157                                 local interface_name="red0"
 158
 159                                 # The gateway is always the first IP address in the subnet
 160                                 local gateway="$(to_address $(( netaddress_num + 1 )))"
 161
 162                                 (
 163                                         echo "RED_TYPE=STATIC"
 164                                         echo "RED_DEV=${interface_name}"
 165                                         echo "RED_MACADDR=${mac}"
 166                                         echo "RED_DESCRIPTION='${interface_id}'"
 167                                         echo "RED_ADDRESS=${ipv4_address}"
 168                                         echo "RED_NETMASK=${netmask}"
 169                                         echo "RED_NETADDRESS=${netaddress}"
 170                                         echo "RED_MTU=1500"
 171                                         echo "DEFAULT_GATEWAY=${gateway}"
 172                                 ) >> /var/ipfire/ethernet/settings
 173
 174                                 # Import aliases for RED
 175                                 for alias in $(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | tail -n +2); do
 176                                         echo "${alias},on,"
 177                                 done > /var/ipfire/ethernet/aliases
 178                                 ;;
 179
 180                         # GREEN
 181                         1)
 182                                 local interface_name="green0"
 183
 184                                 (
 185                                         echo "GREEN_DEV=${interface_name}"
 186                                         echo "GREEN_MACADDR=${mac}"
 187                                         echo "GREEN_DESCRIPTION='${interface_id}'"
 188                                         echo "GREEN_ADDRESS=${ipv4_address}"
 189                                         echo "GREEN_NETMASK=${netmask}"
 190                                         echo "GREEN_NETADDRESS=${netaddress}"
 191                                         echo "GREEN_MTU=${DEFAULT_MTU}"
 192                                 ) >> /var/ipfire/ethernet/settings
 193                                 ;;
 194
 195                         # ORANGE
 196                         2)
 197                                 local interface_name="orange0"
 198                                 config_type=2
 199
 200                                 (
 201                                         echo "ORANGE_DEV=${interface_name}"
 202                                         echo "ORANGE_MACADDR=${mac}"
 203                                         echo "ORANGE_DESCRIPTION='${interface_id}'"
 204                                         echo "ORANGE_ADDRESS=${ipv4_address}"
 205                                         echo "ORANGE_NETMASK=${netmask}"
 206                                         echo "ORANGE_NETADDRESS=${netaddress}"
 207                                         echo "ORANGE_MTU=${DEFAULT_MTU}"
 208                                 ) >> /var/ipfire/ethernet/settings
 209                                 ;;
 210                 esac
 211         done
 212
 213         # Save CONFIG_TYPE
 214         echo "CONFIG_TYPE=${config_type}" >> /var/ipfire/ethernet/settings
 215
 216         # Actions performed only on the very first start
 217         if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
 218                 # Disable using ISP nameservers
 219                 sed -e "s/^USE_ISP_NAMESERVERS=.*/USE_ISP_NAMESERVERS=off/" -i /var/ipfire/dns/settings
 220
 221                 # Enable SSH
 222                 sed -e "s/ENABLE_SSH=.*/ENABLE_SSH=on/g" -i /var/ipfire/remote/settings
 223
 224                 # Disable SSH password authentication
 225                 sed -e "s/^ENABLE_SSH_PASSWORDS=.*/ENABLE_SSH_PASSWORDS=off/" -i /var/ipfire/remote/settings
 226
 227                 # Enable SSH key authentication
 228                 sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings
 229
 230                 # Apply SSH settings
 231                 /usr/local/bin/sshctrl
 232
 233                 # Mark SSH to start immediately (but not right now)
 234                 touch /var/ipfire/remote/enablessh
 235                 chown nobody:nobody /var/ipfire/remote/enablessh
 236
 237                 # Firewall rules for SSH and WEBIF
 238                 (
 239                         echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 240                         echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
 241                 ) >> /var/ipfire/firewall/input
 242
 243                 # Download user-data
 244                 local user_data="$(get user-data)"
 245
 246                 # Save user-data script to be executed later
 247                 if [ "${user_data:0:2}" = "#!" ]; then
 248                         echo "${user_data}" > /tmp/aws-user-data.script
 249                         chmod 700 /tmp/aws-user-data.script
 250
 251                         # Run the user-data script
 252                         local now="$(date -u +"%s")"
 253                         /tmp/aws-user-data.script &>/var/log/user-data.log.${now}
 254
 255                         # Delete the script right away
 256                         rm /tmp/aws-user-data.script
 257                 fi
 258
 259                 # This script has now completed the first steps of setup
 260                 touch /var/ipfire/main/firstsetup_ok
 261         fi
 262
 263         # All done
 264         echo_ok
 265 }
 266
 267 case "${reason}" in
 268         PREINIT)
 269                 # Bring up the interface
 270                 ip link set "${interface}" up
 271                 ;;
 272
 273         BOUND|RENEW|REBIND|REBOOT)
 274                 # Remove any previous IP addresses
 275                 ip addr flush dev "${interface}"
 276
 277                 # Add (or re-add) the new IP address
 278                 ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"
 279
 280                 # Add the default route
 281                 ip route add default via "${new_routers}"
 282
 283                 # Setup DNS
 284                 for domain_name_server in ${new_domain_name_servers}; do
 285                         echo "nameserver ${domain_name_server}"
 286                 done > /etc/resolv.conf
 287
 288                 # The system is online now
 289                 touch /var/ipfire/red/active
 290
 291                 # Import AWS configuration
 292                 import_aws_configuration
 293                 ;;
 294
 295         EXPIRE|FAIL|RELEASE|STOP)
 296                 # The system is no longer online
 297                 rm -f /var/ipfire/red/active
 298
 299                 # Remove all IP addresses
 300                 ip addr flush dev "${interface}"
 301
 302                 # Shut down the interface
 303                 ip link set "${interface}" down
 304                 ;;
 305
 306         *)
 307                 echo "Unhandled reason: ${reason}" >&2
 308                 exit 2
 309                 ;;
 310 esac
 311
 312 # Terminate
 313 exit 0