src/functions/functions.ipsec

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2017  IPFire Network Development Team                         #
   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 IPSEC_CONNECTION_CONFIG_SETTINGS="\
  23         AUTH_MODE \
  24         DPD_ACTION \
  25         DPD_DELAY \
  26         DPD_TIMEOUT \
  27         INACTIVITY_TIMEOUT \
  28         LOCAL_ADDRESS \
  29         LOCAL_ID \
  30         LOCAL_PREFIX \
  31         MODE \
  32         PEER \
  33         PSK \
  34         REMOTE_ID \
  35         REMOTE_PREFIX \
  36         SECURITY_POLICY"
  37
  38 # Default values
  39 IPSEC_DEFAULT_AUTH_MODE="PSK"
  40 IPSEC_DEFAULT_DPD_ACTION="restart"
  41 IPSEC_DEFAULT_DPD_DELAY="30"
  42 IPSEC_DEFAULT_DPD_TIMEOUT="120"
  43 IPSEC_DEFAULT_INACTIVITY_TIMEOUT="0"
  44 IPSEC_DEFAULT_MODE="tunnel"
  45 IPSEC_DEFAULT_SECURITY_POLICY="system"
  46 IPSEC_DEFAULT_START_ACTION="on-demand"
  47
  48 IPSEC_VALID_MODES="gre-transport tunnel vti"
  49 IPSEC_VALID_AUTH_MODES="PSK"
  50
  51 cli_ipsec() {
  52         local action=${1}
  53         shift 1
  54
  55         case "${action}" in
  56                 connection)
  57                         cli_ipsec_connection $@
  58                         ;;
  59                 *)
  60                         error "Unrecognized argument: ${action}"
  61                         exit ${EXIT_ERROR}
  62                         ;;
  63         esac
  64 }
  65
  66 cli_ipsec_connection() {
  67         if ipsec_connection_exists ${1}; then
  68                 local connection=${1}
  69                 local key=${2}
  70                 key=${key//-/_}
  71                 shift 2
  72
  73                 case "${key}" in
  74                         authentication|down|dpd|inactivity_timeout|local|mode|peer|remote|security_policy|start_action|up)
  75                                 ipsec_connection_${key} ${connection} $@
  76                                 ;;
  77                         show)
  78                                 cli_ipsec_connection_show "${connection}"
  79                                 exit $?
  80                                 ;;
  81                         *)
  82                                 error "Unrecognized argument: ${key}"
  83                                 exit ${EXIT_ERROR}
  84                                 ;;
  85                 esac
  86         else
  87                 local action=${1}
  88                 shift
  89
  90                 case "${action}" in
  91                         new)
  92                                 ipsec_connection_new $@
  93                                 ;;
  94                         destroy)
  95                                 ipsec_connection_destroy $@
  96                                 ;;
  97                         ""|*)
  98                                 if [ -n "${action}" ]; then
  99                                         error "Unrecognized argument: '${action}'"
 100                                 fi
 101                                 exit ${EXIT_ERROR}
 102                                 ;;
 103                 esac
 104         fi
 105 }
 106
 107 cli_ipsec_connection_show() {
 108         local connection="${1}"
 109
 110         # Read the config settings
 111         local ${IPSEC_CONNECTION_CONFIG_SETTINGS}
 112         if ! ipsec_connection_read_config "${connection}"; then
 113                 error "Could not read the connection configuration"
 114                 return ${EXIT_ERROR}
 115         fi
 116
 117         cli_headline 0 "IPsec VPN Connection: ${connection}"
 118         cli_space
 119
 120         # Peer
 121         if isset PEER; then
 122                 cli_print_fmt1 1 "Peer" "${PEER}"
 123         fi
 124
 125         # Security Policy
 126         cli_print_fmt1 1 "Security Policy" "${SECURITY_POLICY-${IPSEC_DEFAULT_SECURITY_POLICY}}"
 127         cli_space
 128
 129         cli_headline 2 "Authentication"
 130         case "${AUTH_MODE^^}" in
 131                 PSK)
 132                         cli_print_fmt1 2 "Mode" "Pre-Shared-Key"
 133
 134                         if isset PSK; then
 135                                 cli_print_fmt1 2 "Pre-Shared-Key" "****"
 136                         else
 137                                 cli_print_fmt1 2 "Pre-Shared-Key" "- is not set -"
 138                         fi
 139                         ;;
 140                 X509)
 141                         : # TODO
 142                         ;;
 143         esac
 144         cli_space
 145
 146         local i
 147         for i in LOCAL REMOTE; do
 148                 case "${i}" in
 149                         LOCAL)
 150                                 cli_headline 2 "Local"
 151                                 ;;
 152                         REMOTE)
 153                                 cli_headline 2 "Remote"
 154                                 ;;
 155                 esac
 156
 157                 local id_var="${i}_ID"
 158                 if [ -n "${!id_var}" ]; then
 159                         cli_print_fmt1 2 "ID" "${!id_var}"
 160                 fi
 161
 162                 local prefix_var="${i}_PREFIX"
 163                 if isset ${prefix_var}; then
 164                         cli_headline 3 "Prefix(es)"
 165
 166                         local prefix
 167                         for prefix in ${!prefix_var}; do
 168                                 cli_print_fmt1 3 "${prefix}"
 169                         done
 170                 fi
 171
 172                 cli_space
 173         done
 174
 175         cli_headline 2 "Misc."
 176
 177         case "${MODE}" in
 178                 gre-transport)
 179                         cli_print_fmt1 2 "Transport Mode" "GRE Transport"
 180                         ;;
 181                 tunnel)
 182                         cli_print_fmt1 2 "Transport Mode" "Tunnel"
 183                         ;;
 184                 vti)
 185                         cli_print_fmt1 2 "Transport Mode" "Virtual Tunnel Interface"
 186                         ;;
 187                 *)
 188                         cli_print_fmt1 2 "Transport Mode" "- Unknown -"
 189                         ;;
 190         esac
 191
 192         # Inactivity timeout
 193         if isset INACTIVITY_TIMEOUT && [ ${INACTIVITY_TIMEOUT} -gt 0 ]; then
 194                 cli_print_fmt1 2 "Inactivity Timeout" "$(format_time ${INACTIVITY_TIMEOUT})"
 195         fi
 196         cli_space
 197
 198         return ${EXIT_OK}
 199 }
 200
 201 # This function writes all values to a via ${connection} specificated VPN IPsec configuration file
 202 ipsec_connection_write_config() {
 203         assert [ $# -ge 1 ]
 204
 205         local connection="${1}"
 206
 207         if ! ipsec_connection_exists "${connection}"; then
 208                 log ERROR "No such VPN IPsec connection: ${connection}"
 209                 return ${EXIT_ERROR}
 210         fi
 211
 212         local path="${NETWORK_IPSEC_CONNS_DIR}/${connection}/settings"
 213
 214         if ! settings_write "${path}" ${IPSEC_CONNECTION_CONFIG_SETTINGS}; then
 215                 log ERROR "Could not write configuration settings for VPN IPsec connection ${connection}"
 216                 return ${EXIT_ERROR}
 217         fi
 218
 219         ipsec_reload ${connection}
 220 }
 221
 222 # This funtion writes the value for one key to a via ${connection} specificated VPN IPsec connection configuration file
 223 ipsec_connection_write_config_key() {
 224         assert [ $# -ge 3 ]
 225
 226         local connection=${1}
 227         local key=${2}
 228         shift 2
 229
 230         local value="$@"
 231
 232         if ! ipsec_connection_exists "${connection}"; then
 233                 log ERROR "No such VPN ipsec connection: ${connection}"
 234                 return ${EXIT_ERROR}
 235         fi
 236
 237         log DEBUG "Set '${key}' to new value '${value}' in VPN ipsec connection '${connection}'"
 238
 239         local ${IPSEC_CONNECTION_CONFIG_SETTINGS}
 240
 241         # Read the config settings
 242         if ! ipsec_connection_read_config "${connection}"; then
 243                 return ${EXIT_ERROR}
 244         fi
 245
 246         # Set the key to a new value
 247         assign "${key}" "${value}"
 248
 249         if ! ipsec_connection_write_config "${connection}"; then
 250                 return ${EXIT_ERROR}
 251         fi
 252
 253         return ${EXIT_TRUE}
 254 }
 255
 256 # Reads one or more keys out of a settings file or all if no key is provided.
 257 ipsec_connection_read_config() {
 258         assert [ $# -ge 1 ]
 259
 260         local connection="${1}"
 261         shift 1
 262
 263         if ! ipsec_connection_exists "${connection}"; then
 264                 log ERROR "No such VPN IPsec connection : ${connection}"
 265                 return ${EXIT_ERROR}
 266         fi
 267
 268
 269         local args
 270         if [ $# -eq 0 ] && [ -n "${IPSEC_CONNECTION_CONFIG_SETTINGS}" ]; then
 271                 list_append args ${IPSEC_CONNECTION_CONFIG_SETTINGS}
 272         else
 273                 list_append args $@
 274         fi
 275
 276         local path="${NETWORK_IPSEC_CONNS_DIR}/${connection}/settings"
 277
 278         if ! settings_read "${path}" ${args}; then
 279                 log ERROR "Could not read settings for VPN IPsec connection ${connection}"
 280                 return ${EXIT_ERROR}
 281         fi
 282 }
 283
 284 # This function checks if a vpn ipsec connection exists
 285 # Returns True when yes and false when not
 286 ipsec_connection_exists() {
 287         assert [ $# -eq 1 ]
 288
 289         local connection=${1}
 290
 291         local path="${NETWORK_IPSEC_CONNS_DIR}/${connection}"
 292
 293         [ -d "${path}" ] && return ${EXIT_TRUE} || return ${EXIT_FALSE}
 294 }
 295
 296 # Reloads the connection after config changes
 297 ipsec_reload() {
 298         return ${EXIT_TRUE}
 299 }
 300
 301 # Handle the cli after authentification
 302 ipsec_connection_authentication() {
 303         if [ ! $# -gt 1 ]; then
 304                 log ERROR "Not enough arguments"
 305                 return ${EXIT_ERROR}
 306         fi
 307
 308         local connection=${1}
 309         local cmd=${2}
 310         shift 2
 311
 312         case ${cmd} in
 313                 mode)
 314                         ipsec_connection_authentication_mode "${connection}" $@
 315                         ;;
 316                 pre-shared-key)
 317                         ipsec_connection_authentication_psk "${connection}" $@
 318                         ;;
 319                 *)
 320                         log ERROR "Unrecognized argument: ${cmd}"
 321                         return ${EXIT_ERROR}
 322                         ;;
 323         esac
 324 }
 325
 326 # Set the authentification mode
 327 ipsec_connection_authentication_mode() {
 328         if [ ! $# -eq 2 ]; then
 329                 log ERROR "Not enough arguments"
 330                 return ${EXIT_ERROR}
 331         fi
 332         local connection=${1}
 333         local mode=${2}
 334
 335         if ! isoneof mode ${IPSEC_VALID_AUTH_MODES}; then
 336                 log ERROR "Auth mode '${mode}' is invalid"
 337                 return ${EXIT_ERROR}
 338         fi
 339
 340         if ! ipsec_connection_write_config_key "${connection}" "AUTH_MODE" ${mode^^}; then
 341                 log ERROR "Could not write configuration settings"
 342                 return ${EXIT_ERROR}
 343         fi
 344 }
 345
 346 # Set the psk
 347 ipsec_connection_authentication_psk() {
 348         if [ ! $# -eq 2 ]; then
 349                 log ERROR "Not enough arguments"
 350                 return ${EXIT_ERROR}
 351         fi
 352
 353         local connection=${1}
 354         local psk=${2}
 355
 356         local length=${#psk}
 357
 358         if [ ${length} -lt 4 ]; then
 359                 error "The PSK must be longer than four characters"
 360                 return ${EXIT_ERROR}
 361         fi
 362
 363         if [ ${length} -gt 128 ]; then
 364                 error "The PSK cannot be longer than 128 characters"
 365                 return ${EXIT_ERROR}
 366         fi
 367
 368         if ! ipsec_connection_write_config_key "${connection}" "PSK" "${psk}"; then
 369                 log ERROR "Could not write configuration settings"
 370                 return ${EXIT_ERROR}
 371         fi
 372
 373         return ${EXIT_OK}
 374 }
 375
 376 ipsec_connection_up() {
 377         local connection="${1}"
 378
 379         if ! ipsec_connection_exists "${connection}"; then
 380                 error "No such VPN IPsec connection: ${connection}"
 381                 return ${EXIT_ERROR}
 382         fi
 383
 384         cmd swanctl --initiate --child "${connection}"
 385 }
 386
 387 ipsec_connection_down() {
 388         local connection="${1}"
 389
 390         if ! ipsec_connection_exists "${connection}"; then
 391                 error "No such VPN IPsec connection: ${connection}"
 392                 return ${EXIT_ERROR}
 393         fi
 394
 395         cmd swanctl --terminate --ike "${connection}"
 396 }
 397
 398 # Handle the cli after authentification
 399 ipsec_connection_dpd() {
 400         if [ ! $# -gt 1 ]; then
 401                 log ERROR "Not enough arguments"
 402                 return ${EXIT_ERROR}
 403         fi
 404
 405         local connection=${1}
 406         local cmd=${2}
 407         shift 2
 408
 409         case ${cmd} in
 410                 action)
 411                         ipsec_connection_dpd_action "${connection}" $@
 412                         ;;
 413                 delay)
 414                         ipsec_connection_dpd_delay "${connection}" $@
 415                         ;;
 416                 timeout)
 417                         ipsec_connection_dpd_timeout "${connection}" $@
 418                         ;;
 419                 *)
 420                         log ERROR "Unrecognized argument: ${cmd}"
 421                         return ${EXIT_ERROR}
 422                         ;;
 423         esac
 424 }
 425
 426 # Set the default dpd action
 427 ipsec_connection_dpd_action() {
 428         if [ ! $# -eq 2 ]; then
 429                 log ERROR "Not enough arguments"
 430                 return ${EXIT_ERROR}
 431         fi
 432         local connection=${1}
 433         local action=${2}
 434
 435         if ! isoneof action "restart" "clear"; then
 436                 log ERROR "dpd action '${action}' is invalid"
 437                 return ${EXIT_ERROR}
 438         fi
 439
 440         if ! ipsec_connection_write_config_key "${connection}" "DPD_ACTION" ${action}; then
 441                 log ERROR "Could not write configuration settings"
 442                 return ${EXIT_ERROR}
 443         fi
 444 }
 445
 446 # Set the dpd delay
 447 ipsec_connection_dpd_delay() {
 448         if [ ! $# -ge 2 ]; then
 449                 log ERROR "Not enough arguments"
 450                 return ${EXIT_ERROR}
 451         fi
 452
 453         local connection=${1}
 454         shift 1
 455         local value=$@
 456
 457         if ! isinteger value; then
 458                 value=$(parse_time $@)
 459                 if [ ! $? -eq 0 ]; then
 460                         log ERROR "Parsing the passed time was not sucessful please check the passed values."
 461                         return ${EXIT_ERROR}
 462                 fi
 463         fi
 464
 465         if [ ${value} -lt 0 ]; then
 466                 log ERROR "The passed time value must be in the sum greater or equal zero seconds."
 467                 return ${EXIT_ERROR}
 468         fi
 469
 470         if ! ipsec_connection_write_config_key "${connection}" "DPD_DELAY" ${value}; then
 471                 log ERROR "Could not write configuration settings"
 472                 return ${EXIT_ERROR}
 473         fi
 474
 475         return ${EXIT_OK}
 476 }
 477
 478 # Set the dpd timeout
 479 ipsec_connection_dpd_timeout() {
 480         if [ ! $# -ge 2 ]; then
 481                 log ERROR "Not enough arguments"
 482                 return ${EXIT_ERROR}
 483         fi
 484
 485         local connection=${1}
 486         shift 1
 487         local value=$@
 488
 489         if ! isinteger value; then
 490                 value=$(parse_time $@)
 491                 if [ ! $? -eq 0 ]; then
 492                         log ERROR "Parsing the passed time was not sucessful please check the passed values."
 493                         return ${EXIT_ERROR}
 494                 fi
 495         fi
 496
 497         if [ ${value} -le 0 ]; then
 498                 log ERROR "The passed time value must be in the sum greater or equal zero seconds."
 499                 return ${EXIT_ERROR}
 500         fi
 501
 502         if ! ipsec_connection_write_config_key "${connection}" "DPD_TIMEOUT" ${value}; then
 503                 log ERROR "Could not write configuration settings"
 504                 return ${EXIT_ERROR}
 505         fi
 506
 507         return ${EXIT_OK}
 508 }
 509
 510 # Handle the cli after local
 511 ipsec_connection_local() {
 512         if [ ! $# -ge 2 ]; then
 513                 log ERROR "Not enough arguments"
 514                 return ${EXIT_ERROR}
 515         fi
 516
 517         local connection=${1}
 518         local cmd=${2}
 519         shift 2
 520
 521         case ${cmd} in
 522                 address)
 523                         ipsec_connection_local_address "${connection}" $@
 524                         ;;
 525                 id)
 526                         ipsec_connection_id "${connection}" "LOCAL" $@
 527                         ;;
 528                 prefix)
 529                         ipsec_connection_prefix "${connection}" "LOCAL" $@
 530                         ;;
 531                 *)
 532                         log ERROR "Unrecognized argument: ${cmd}"
 533                         return ${EXIT_ERROR}
 534                         ;;
 535         esac
 536
 537         return ${EXIT_OK}
 538 }
 539
 540 # Set the connection mode
 541 ipsec_connection_mode() {
 542         if [ ! $# -eq 2 ]; then
 543                 log ERROR "Not enough arguments"
 544                 return ${EXIT_ERROR}
 545         fi
 546         local connection=${1}
 547         local mode=${2}
 548
 549         if ! isoneof mode ${IPSEC_VALID_MODES}; then
 550                 log ERROR "Mode '${mode}' is invalid"
 551                 return ${EXIT_ERROR}
 552         fi
 553
 554         if ! ipsec_connection_write_config_key "${connection}" "MODE" ${mode}; then
 555                 log ERROR "Could not write configuration settings"
 556                 return ${EXIT_ERROR}
 557         fi
 558
 559         return ${EXIT_OK}
 560 }
 561
 562 # Set the local address
 563 ipsec_connection_local_address() {
 564         if [ ! $# -eq 2 ]; then
 565                 log ERROR "Not enough arguments"
 566                 return ${EXIT_ERROR}
 567         fi
 568         local connection=${1}
 569         local local_address=${2}
 570
 571         if ! ipsec_connection_check_peer ${local_address}; then
 572                 log ERROR "Local address '${local_address}' is invalid"
 573                 return ${EXIT_ERROR}
 574         fi
 575
 576         if ! ipsec_connection_write_config_key "${connection}" "LOCAL_ADDRESS" ${local_address}; then
 577                 log ERROR "Could not write configuration settings"
 578                 return ${EXIT_ERROR}
 579         fi
 580
 581         return ${EXIT_OK}
 582 }
 583
 584 # Set the peer to connect to
 585 ipsec_connection_peer() {
 586         if [ ! $# -eq 2 ]; then
 587                 log ERROR "Not enough arguments"
 588                 return ${EXIT_ERROR}
 589         fi
 590         local connection=${1}
 591         local peer=${2}
 592
 593         if ! ipsec_connection_check_peer ${peer}; then
 594                 log ERROR "Peer '${peer}' is invalid"
 595                 return ${EXIT_ERROR}
 596         fi
 597
 598         if ! ipsec_connection_write_config_key "${connection}" "PEER" ${peer}; then
 599                 log ERROR "Could not write configuration settings"
 600                 return ${EXIT_ERROR}
 601         fi
 602
 603         return ${EXIT_OK}
 604 }
 605
 606 #Set the local or remote id
 607 ipsec_connection_id() {
 608         if [ ! $# -eq 3 ]; then
 609                 log ERROR "Not enough arguments"
 610                 return ${EXIT_ERROR}
 611         fi
 612         local connection=${1}
 613         local type=${2}
 614         local id=${3}
 615
 616         if ! ipsec_connection_check_id ${id}; then
 617                 log ERROR "Id '${id}' is invalid"
 618                 return ${EXIT_ERROR}
 619         fi
 620
 621         if ! ipsec_connection_write_config_key "${connection}" "${type}_ID" ${id}; then
 622                 log ERROR "Could not write configuration settings"
 623                 return ${EXIT_ERROR}
 624         fi
 625
 626         return ${EXIT_OK}
 627 }
 628
 629 # Set the local or remote prefix
 630 ipsec_connection_prefix() {
 631         if [ ! $# -ge 3 ]; then
 632                 log ERROR "Not enough arguments"
 633                 return ${EXIT_ERROR}
 634         fi
 635         local connection=${1}
 636         local type=${2}
 637         shift 2
 638
 639         local _prefix="${type}_PREFIX"
 640         local "${_prefix}"
 641         if ! ipsec_connection_read_config "${connection}" "${_prefix}"; then
 642                 return ${EXIT_ERROR}
 643         fi
 644
 645         # Remove duplicated entries to proceed the list safely
 646         assign "${_prefix}" "$(list_unique ${!_prefix} )"
 647
 648         local prefixes_added
 649         local prefixes_removed
 650         local prefixes_set
 651
 652         while [ $# -gt 0 ]; do
 653                 local arg="${1}"
 654
 655                 case "${arg}" in
 656                         +*)
 657                                 list_append prefixes_added "${arg:1}"
 658                                 ;;
 659                         -*)
 660                                 list_append prefixes_removed "${arg:1}"
 661                                 ;;
 662                         [A-Fa-f0-9]*)
 663                                 list_append prefixes_set "${arg}"
 664                                 ;;
 665                         *)
 666                                 error "Invalid argument: ${arg}"
 667                                 return ${EXIT_ERROR}
 668                                 ;;
 669                 esac
 670                 shift
 671         done
 672
 673         # Check if the user is trying a mixed operation
 674         if ! list_is_empty prefixes_set && (! list_is_empty prefixes_added || ! list_is_empty prefixes_removed); then
 675                 error "You cannot reset the prefix list and add or remove prefixes at the same time"
 676                 return ${EXIT_ERROR}
 677         fi
 678
 679         # Set new prefix list
 680         if ! list_is_empty prefixes_set; then
 681                 # Check if all prefixes are valid
 682                 local prefix
 683                 for prefix in ${prefixes_set}; do
 684                         if ! ip_net_is_valid ${prefix}; then
 685                                 error "Unsupported prefix: ${prefix}"
 686                                 return ${EXIT_ERROR}
 687                         fi
 688                 done
 689
 690                 assign "${_prefix}" "${prefixes_set}"
 691
 692         # Perform incremental updates
 693         else
 694                 local prefix
 695
 696                 # Perform all removals
 697                 for prefix in ${prefixes_removed}; do
 698                         if ! list_remove "${_prefix}" ${prefix}; then
 699                                 warning "${prefix} was not on the list and could not be removed"
 700                         fi
 701                 done
 702
 703
 704                 for prefix in ${prefixes_added}; do
 705                         if ip_net_is_valid ${prefix}; then
 706                                 if ! list_append_unique "${_prefix}" ${prefix}; then
 707                                         warning "${prefix} is already on the prefix list"
 708                                 fi
 709                         else
 710                                 warning "${prefix} is not a valid IP network and could not be added"
 711                         fi
 712                 done
 713         fi
 714
 715         # Check if the list contain at least one valid prefix
 716         if list_is_empty ${_prefix}; then
 717                 error "Cannot save an empty prefix list"
 718                 return ${EXIT_ERROR}
 719         fi
 720
 721         # Save everything
 722         if ! ipsec_connection_write_config_key "${connection}" "${_prefix}" ${!_prefix}; then
 723                 log ERROR "Could not write configuration settings"
 724         fi
 725
 726         return ${EXIT_OK}
 727 }
 728
 729 # Handle the cli after remote
 730 ipsec_connection_remote() {
 731         if [ ! $# -ge 2 ]; then
 732                 log ERROR "Not enough arguments"
 733                 return ${EXIT_ERROR}
 734         fi
 735
 736         local connection=${1}
 737         local cmd=${2}
 738         shift 2
 739
 740         case ${cmd} in
 741                 id)
 742                         ipsec_connection_id "${connection}" "REMOTE" $@
 743                         ;;
 744
 745                 prefix)
 746                         ipsec_connection_prefix "${connection}" "REMOTE" $@
 747                         ;;
 748                 *)
 749                         log ERROR "Unrecognized argument: ${cmd}"
 750                         return ${EXIT_ERROR}
 751                         ;;
 752         esac
 753
 754         return ${EXIT_OK}
 755 }
 756
 757 # Set the inactivity timeout
 758 ipsec_connection_inactivity_timeout() {
 759         if [ ! $# -ge 2 ]; then
 760                 log ERROR "Not enough arguments"
 761                 return ${EXIT_ERROR}
 762         fi
 763
 764         local connection=${1}
 765         shift 1
 766         local value=$@
 767
 768         if ! isinteger value; then
 769                 value=$(parse_time $@)
 770                 if [ ! $? -eq 0 ]; then
 771                         log ERROR "Parsing the passed time was not sucessful please check the passed values."
 772                         return ${EXIT_ERROR}
 773                 fi
 774         fi
 775
 776         if [ ${value} -le 0 ]; then
 777                 log ERROR "The passed time value must be in the sum greater zero seconds."
 778                 return ${EXIT_ERROR}
 779         fi
 780
 781         if ! ipsec_connection_write_config_key "${connection}" "INACTIVITY_TIMEOUT" ${value}; then
 782                 log ERROR "Could not write configuration settings"
 783                 return ${EXIT_ERROR}
 784         fi
 785
 786         return ${EXIT_OK}
 787 }
 788
 789 # Set the default start action
 790 ipsec_connection_start_action() {
 791         if [ ! $# -eq 2 ]; then
 792                 log ERROR "Not enough arguments"
 793                 return ${EXIT_ERROR}
 794         fi
 795         local connection=${1}
 796         local action=${2}
 797
 798         if ! isoneof action "on-demand" "always-on"; then
 799                 log ERROR "Start action '${action}' is invalid"
 800                 return ${EXIT_ERROR}
 801         fi
 802
 803         if ! ipsec_connection_write_config_key "${connection}" "START_ACTION" ${action}; then
 804                 log ERROR "Could not write configuration settings"
 805                 return ${EXIT_ERROR}
 806         fi
 807 }
 808
 809 # Set the security policy to use
 810 ipsec_connection_security_policy() {
 811         if [ ! $# -eq 2 ]; then
 812                 log ERROR "Not enough arguments"
 813                 return ${EXIT_ERROR}
 814         fi
 815         local connection=${1}
 816         local security_policy=${2}
 817
 818         if ! vpn_security_policy_exists ${security_policy}; then
 819                 log ERROR "No such vpn security policy '${security_policy}'"
 820                 return ${EXIT_ERROR}
 821         fi
 822
 823         if ! ipsec_connection_write_config_key "${connection}" "SECURITY_POLICY" ${security_policy}; then
 824                 log ERROR "Could not write configuration settings"
 825                 return ${EXIT_ERROR}
 826         fi
 827 }
 828
 829 # Check if a id is valid
 830 ipsec_connection_check_id() {
 831         assert [ $# -eq 1 ]
 832         local id=${1}
 833
 834         if [[ ${id} =~ ^@[[:alnum:]]+$ ]] || ip_is_valid ${id}; then
 835                 return ${EXIT_TRUE}
 836         else
 837                 return ${EXIT_FALSE}
 838         fi
 839 }
 840
 841 # Checks if a peer is valid
 842 ipsec_connection_check_peer() {
 843         assert [ $# -eq 1 ]
 844         local peer=${1}
 845
 846         # TODO Accept also FQDNs
 847         if ip_is_valid ${peer}; then
 848                 return ${EXIT_TRUE}
 849         else
 850                 return ${EXIT_FALSE}
 851         fi
 852 }
 853
 854 # This function checks if a VPN IPsec connection name is valid
 855 # Allowed are only A-Za-z0-9
 856 ipsec_connection_check_name() {
 857         assert [ $# -eq 1 ]
 858
 859         local connection=${1}
 860
 861         [[ "${connection}" =~ [^[:alnum:]$] ]]
 862 }
 863
 864 # Function that creates one VPN IPsec connection
 865 ipsec_connection_new() {
 866         if [ $# -gt 1 ]; then
 867                 error "Too many arguments"
 868                 return ${EXIT_ERROR}
 869         fi
 870
 871         local connection="${1}"
 872         if ! isset connection; then
 873                 error "Please provide a connection name"
 874                 return ${EXIT_ERROR}
 875         fi
 876
 877         # Check for duplicates
 878         if ipsec_connection_exists "${connection}"; then
 879                 error "The VPN IPsec connection ${connection} already exists"
 880                 return ${EXIT_ERROR}
 881         fi
 882
 883         # Check if the name of the connection is valid
 884         if  ipsec_connection_check_name "${connection}"; then
 885                 error "'${connection}' contains illegal characters"
 886                 return ${EXIT_ERROR}
 887         fi
 888
 889         log DEBUG "Creating VPN IPsec connection ${connection}"
 890
 891         if ! mkdir -p "${NETWORK_IPSEC_CONNS_DIR}/${connection}"; then
 892                 log ERROR "Could not create config directory for ${connection}"
 893                 return ${EXIT_ERROR}
 894         fi
 895
 896         local ${IPSEC_CONNECTION_CONFIG_SETTINGS}
 897
 898         AUTH_MODE=${IPSEC_DEFAULT_AUTH_MODE}
 899         DPD_ACTION=${IPSEC_DEFAULT_DPD_ACTION}
 900         DPD_DELAY=${IPSEC_DEFAULT_DPD_DELAY}
 901         DPD_TIMEOUT=${IPSEC_DEFAULT_DPD_TIMEOUT}
 902         MODE=${IPSEC_DEFAULT_MODE}
 903         START_ACTION=${IPSEC_DEFAULT_START_ACTION}
 904
 905         INACTIVITY_TIMEOUT=${IPSEC_DEFAULT_INACTIVITY_TIMEOUT}
 906         SECURITY_POLICY=${IPSEC_DEFAULT_SECURITY_POLICY}
 907
 908         if ! ipsec_connection_write_config "${connection}"; then
 909                 log ERROR "Could not write new config file"
 910                 return ${EXIT_ERROR}
 911         fi
 912 }
 913
 914 # Function that deletes based on the passed parameters one ore more vpn security policies
 915 ipsec_connection_destroy() {
 916         local connection
 917         for connection in $@; do
 918                 if ! ipsec_connection_exists "${connection}"; then
 919                         log ERROR "The VPN IPsec connection ${connection} does not exist."
 920                         continue
 921                 fi
 922
 923                 log DEBUG "Deleting VPN IPsec connection ${connection}"
 924                 if ! rm -rf "${NETWORK_IPSEC_CONNS_DIR}/${connection}"; then
 925                         log ERROR "Deleting the VPN IPsec connection ${connection} was not sucessful"
 926                         return ${EXIT_ERROR}
 927                 fi
 928         done
 929 }
 930
 931 # List all ipsec connections
 932 ipsec_list_connections() {
 933         local connection
 934         for connection in ${NETWORK_IPSEC_CONNS_DIR}/*; do
 935                 [ -d ${connection} ] || continue
 936                 basename ${connection}
 937         done
 938 }
 939
 940 ipsec_connection_to_strongswan() {
 941         local connection="${1}"
 942
 943         # Read the config settings
 944         local ${IPSEC_CONNECTION_CONFIG_SETTINGS}
 945         if ! ipsec_connection_read_config "${connection}"; then
 946                 error "Could not read the connection ${connection}"
 947                 return ${EXIT_ERROR}
 948         fi
 949
 950         local path="${NETWORK_IPSEC_SWANCTL_CONNECTIONS_DIR}/${connection}.conf"
 951
 952         (
 953                 # Write the connection section
 954                 _ipsec_connection_to_strongswan_connection "${connection}"
 955
 956                 # Write the secrets section
 957                 _ipsec_connection_to_strongswan_secrets "${connection}"
 958
 959         ) > ${path}
 960 }
 961
 962 _ipsec_connection_to_strongswan_connection() {
 963         local connection="${1}"
 964
 965         # Read the security policy
 966         local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
 967         if ! vpn_security_policies_read_config "${SECURITY_POLICY}"; then
 968                 return ${EXIT_ERROR}
 969         fi
 970
 971         # Is DPD enabled?
 972         local dpd="false"
 973         if isset DPD_DELAY && isinteger DPD_DELAY && [ ${DPD_DELAY} -gt 0 ]; then
 974                 dpd="true"
 975         fi
 976
 977         print_indent 0 "connections {"
 978         print_indent 1 "${connection} {"
 979
 980         # IKE Version
 981         print_indent 2 "# IKE Version"
 982         case "${KEY_EXCHANGE^^}" in
 983                 IKEV1)
 984                         print_indent 2 "version = 1"
 985                         ;;
 986
 987                 # Fall back to IKEv2 for any random values
 988                 IKEV2|*)
 989                         print_indent 2 "version = 2"
 990                         ;;
 991         esac
 992         print # empty line
 993
 994         # Local Address
 995         print_indent 2 "# Local Address"
 996         if isset LOCAL_ADDRESS; then
 997                 print_indent 2 "local_addrs = ${LOCAL_ADDRESS}"
 998         else
 999                 print_indent 2 "local_addrs = %any"
1000         fi
1001         print
1002
1003         # Remote Address
1004         print_indent 2 "# Remote Address"
1005         if isset PEER; then
1006                 print_indent 2 "remote_addrs = ${PEER}"
1007         else
1008                 print_indent 2 "remote_addrs = %any"
1009         fi
1010         print
1011
1012         # IKE Proposals
1013         print_indent 2 "# IKE Proposals"
1014         print_indent 2 "proposals = $(vpn_security_policies_make_ah_proposal ${SECURITY_POLICY})"
1015         print
1016
1017         # DPD Settings
1018         if enabled dpd; then
1019                 print_indent 2 "# Dead Peer Detection"
1020                 print_indent 2 "dpd_delay = ${DPD_DELAY}"
1021
1022                 if isset DPD_TIMEOUT; then
1023                         print_indent 2 "dpd_timeout = ${DPD_TIMEOUT}"
1024                 fi
1025
1026                 print
1027         fi
1028
1029         # Fragmentation
1030         print_indent 2 "# Fragmentation"
1031         print_indent 2 "fragmentation = yes"
1032         print
1033
1034         # Local
1035         print_indent 2 "local {"
1036
1037         # Local ID
1038         if isset LOCAL_ID; then
1039                 print_indent 3 "id = ${LOCAL_ID}"
1040         fi
1041
1042         # Authentication
1043         case "${AUTH_MODE}" in
1044                 PSK)
1045                         print_indent 3 "auth = psk"
1046                         ;;
1047         esac
1048
1049         print_indent 2 "}"
1050         print
1051
1052         # Remote
1053         print_indent 2 "remote {"
1054
1055         # Remote ID
1056         if isset REMOTE_ID; then
1057                 print_indent 3 "id = ${REMOTE_ID}"
1058         fi
1059
1060         # Authentication
1061         case "${AUTH_MODE}" in
1062                 PSK)
1063                         print_indent 3 "auth = psk"
1064                         ;;
1065         esac
1066
1067         print_indent 2 "}"
1068         print
1069
1070         # Children
1071
1072         print_indent 2 "children {"
1073         print_indent 3 "${connection} {"
1074
1075         print_indent 4 "# ESP Proposals"
1076         print_indent 4 "esp_proposals = $(vpn_security_policies_make_esp_proposal ${SECURITY_POLICY})"
1077         print
1078
1079         # Traffic Selectors
1080
1081         case "${MODE}" in
1082                 gre-*)
1083                         print_indent 4 "local_ts = dynamic[gre]"
1084                         print_indent 4 "remote_ts = dynamic[gre]"
1085                         ;;
1086                 *)
1087                         # Local Prefixes
1088                         if isset LOCAL_PREFIX; then
1089                                 print_indent 4 "local_ts = $(list_join LOCAL_PREFIX ,)"
1090                         else
1091                                 print_indent 4 "local_ts = dynamic"
1092                         fi
1093
1094                         # Remote Prefixes
1095                         if isset REMOTE_PREFIX; then
1096                                 print_indent 4 "remote_ts = $(list_join REMOTE_PREFIX ,)"
1097                         else
1098                                 print_indent 4 "remote_ts = dynamic"
1099                         fi
1100                         ;;
1101         esac
1102         print
1103
1104         # Netfilter Marks
1105         print_indent 4 "# Netfilter Marks"
1106         print_indent 4 "mark_in = %unique"
1107         print_indent 4 "mark_out = %unique"
1108         print
1109
1110         # Dead Peer Detection
1111         if enabled dpd; then
1112                 print_indent 4 "# Dead Peer Detection"
1113                 print_indent 4 "dpd_action = ${DPD_ACTION}"
1114                 print
1115         fi
1116
1117         # Rekeying
1118         if isset LIFETIME; then
1119                 print_indent 4 "# Rekey Time"
1120                 print_indent 4 "rekey_time = ${LIFETIME}"
1121                 print
1122         fi
1123
1124         # Updown Script
1125         print_indent 4 "updown = ${NETWORK_HELPERS_DIR}/ipsec-updown"
1126         print
1127
1128         # Mode
1129         print_indent 4 "# Mode"
1130         case "${MODE}" in
1131                 gre-transport)
1132                         print_indent 4 "mode = transport"
1133                         ;;
1134                 tunnel|vti|*)
1135                         print_indent 4 "mode = tunnel"
1136                         ;;
1137         esac
1138         print
1139
1140         # Compression
1141         print_indent 4 "# Compression"
1142         if enabled COMPRESSION; then
1143                 print_indent 4 "ipcomp = yes"
1144         else
1145                 print_indent 4 "ipcomp = no"
1146         fi
1147         print
1148
1149         # Inactivity Timeout
1150         if isset INACTIVITY_TIMEOUT; then
1151                 print_indent 4 "# Inactivity Timeout"
1152                 print_indent 4 "inactivity = ${INACTIVITY_TIMEOUT}"
1153                 print
1154         fi
1155
1156         # Start Action
1157         print_indent 4 "# Start Action"
1158         case "${START_ACTION}" in
1159                 on-demand)
1160                         print_indent 4 "start_action = trap"
1161                         print_indent 4 "close_action = trap"
1162                         ;;
1163                 wait)
1164                         print_indent 4 "start_action = none"
1165                         print_indent 4 "close_action = none"
1166                         ;;
1167                 always-on|*)
1168                         print_indent 4 "start_action = start"
1169                         print_indent 4 "close_action = start"
1170                         ;;
1171         esac
1172         print
1173
1174         print_indent 3 "}"
1175         print_indent 2 "}"
1176         print
1177
1178         print_indent 1 "}"
1179         print_indent 0 "}"
1180         print
1181 }
1182
1183 _ipsec_connection_to_strongswan_secrets() {
1184         local connection="${1}"
1185
1186         print_indent 0 "secrets {"
1187
1188         case "${AUTH_MODE}" in
1189                 PSK)
1190                         print_indent 1 "ike {"
1191
1192                         # Secret
1193                         print_indent 2 "secret = ${PSK}"
1194
1195                         # ID
1196                         if isset REMOTE_ID; then
1197                                 print_indent 2 "id = ${REMOTE_ID}"
1198                         fi
1199
1200                         print_indent 1 "}"
1201                         ;;
1202         esac
1203
1204         print_indent 0 "}"
1205 }