src/functions/functions.vpn-security-policies

   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 VPN_SECURITY_POLICIES_CONFIG_SETTINGS="CIPHER COMPRESSION GROUP_TYPE INTEGRITY KEY_EXCHANGE LIFETIME PFS"
  23 VPN_SECURITY_POLICIES_READONLY="system"
  24
  25 VPN_DEFAULT_SECURITY_POLICY="system"
  26
  27 declare -A VPN_SUPPORTED_CIPHERS=(
  28         # 3DES-CBC
  29         [3DES-CBC]="168 bit 3DES-EDE-CBC"
  30
  31         # AES-CBC
  32         [AES256-CBC]="256 bit AES-CBC"
  33         [AES192-CBC]="192 bit AES-CBC"
  34         [AES128-CBC]="128 bit AES-CBC"
  35
  36         # AES-CTR
  37         [AES256-CTR]="256 bit AES-COUNTER"
  38         [AES192-CTR]="192 bit AES-COUNTER"
  39         [AES128-CTR]="128 bit AES-COUNTER"
  40
  41         # AES-GCM
  42         [AES256-GCM128]="256 bit AES-GCM with 128 bit ICV"
  43         [AES192-GCM128]="192 bit AES-GCM with 128 bit ICV"
  44         [AES128-GCM128]="128 bit AES-GCM with 128 bit ICV"
  45         [AES256-GCM96]="256 bit AES-GCM with 96 bit ICV"
  46         [AES192-GCM96]="192 bit AES-GCM with 96 bit ICV"
  47         [AES128-GCM96]="128 bit AES-GCM with 96 bit ICV"
  48         [AES256-GCM64]="256 bit AES-GCM with 64 bit ICV"
  49         [AES192-GCM64]="192 bit AES-GCM with 64 bit ICV"
  50         [AES128-GCM64]="128 bit AES-GCM with 64 bit ICV"
  51
  52         # AES-CCM
  53         [AES256-CCM128]="256 bit AES-CCM with 128 bit ICV"
  54         [AES192-CCM128]="192 bit AES-CCM with 128 bit ICV"
  55         [AES128-CCM128]="128 bit AES-CCM with 128 bit ICV"
  56         [AES256-CCM96]="256 bit AES-CCM with 96 bit ICV"
  57         [AES192-CCM96]="192 bit AES-CCM with 96 bit ICV"
  58         [AES128-CCM96]="128 bit AES-CCM with 96 bit ICV"
  59         [AES256-CCM64]="256 bit AES-CCM with 64 bit ICV"
  60         [AES192-CCM64]="192 bit AES-CCM with 64 bit ICV"
  61         [AES128-CCM64]="128 bit AES-CCM with 64 bit ICV"
  62
  63         # CAMELLIA-CBC
  64         [CAMELLIA256-CBC]="256 bit CAMELLIA-CBC"
  65         [CAMELLIA192-CBC]="192 bit CAMELLIA-CBC"
  66         [CAMELLIA128-CBC]="128 bit CAMELLIA-CBC"
  67
  68         # CAMELLIA-CTR
  69         [CAMELLIA256-CTR]="256 bit CAMELLIA-COUNTER"
  70         [CAMELLIA192-CTR]="192 bit CAMELLIA-COUNTER"
  71         [CAMELLIA128-CTR]="128 bit CAMELLIA-COUNTER"
  72
  73         # CAMELLIA-GCM
  74         [CAMELLIA256-GCM128]="256 bit CAMELLIA-GCM with 128 bit ICV"
  75         [CAMELLIA192-GCM128]="192 bit CAMELLIA-GCM with 128 bit ICV"
  76         [CAMELLIA128-GCM128]="128 bit CAMELLIA-GCM with 128 bit ICV"
  77         [CAMELLIA256-GCM96]="256 bit CAMELLIA-GCM with 96 bit ICV"
  78         [CAMELLIA192-GCM96]="192 bit CAMELLIA-GCM with 96 bit ICV"
  79         [CAMELLIA128-GCM96]="128 bit CAMELLIA-GCM with 96 bit ICV"
  80         [CAMELLIA256-GCM64]="256 bit CAMELLIA-GCM with 64 bit ICV"
  81         [CAMELLIA192-GCM64]="192 bit CAMELLIA-GCM with 64 bit ICV"
  82         [CAMELLIA128-GCM64]="128 bit CAMELLIA-GCM with 64 bit ICV"
  83
  84         # CAMELLIA-CCM
  85         [CAMELLIA256-CCM128]="256 bit CAMELLIA-CCM with 128 bit ICV"
  86         [CAMELLIA192-CCM128]="192 bit CAMELLIA-CCM with 128 bit ICV"
  87         [CAMELLIA128-CCM128]="128 bit CAMELLIA-CCM with 128 bit ICV"
  88         [CAMELLIA256-CCM96]="256 bit CAMELLIA-CCM with 96 bit ICV"
  89         [CAMELLIA192-CCM96]="192 bit CAMELLIA-CCM with 96 bit ICV"
  90         [CAMELLIA128-CCM96]="128 bit CAMELLIA-CCM with 96 bit ICV"
  91         [CAMELLIA256-CCM64]="256 bit CAMELLIA-CCM with 64 bit ICV"
  92         [CAMELLIA192-CCM64]="192 bit CAMELLIA-CCM with 64 bit ICV"
  93         [CAMELLIA128-CCM64]="128 bit CAMELLIA-CCM with 64 bit ICV"
  94 )
  95
  96 declare -A VPN_SUPPORTED_INTEGRITY=(
  97         [MD5]="MD5-HMAC"
  98
  99         # SHA
 100         [SHA1]="SHA1-HMAC"
 101         [SHA512]="512 bit SHA2-HMAC"
 102         [SHA384]="384 bit SHA2-HMAC"
 103         [SHA256]="256 bit SHA2-HMAC"
 104
 105         # AES
 106         [AES-XCBC]="AES-XCBC"
 107         [AES-CMAC]="AES-CMAC"
 108         [AES256-GMAC]="256 bit AES-GMAC"
 109         [AES192-GMAC]="192 bit AES-GMAC"
 110         [AES128-GMAC]="128 bit AES-GMAC"
 111 )
 112
 113 declare -A VPN_SUPPORTED_GROUP_TYPES=(
 114         # Regular Groups
 115         [MODP768]="768 bit Modulo Prime Group"
 116         [MODP1024]="1024 bit Modulo Prime Group"
 117         [MODP1536]="1536 bit Modulo Prime Group"
 118         [MODP2048]="2048 bit Modulo Prime Group"
 119         [MODP3072]="3072 bit Modulo Prime Group"
 120         [MODP4096]="4096 bit Modulo Prime Group"
 121         [MODP6144]="6144 bit Modulo Prime Group"
 122         [MODP8192]="8192 bit Modulo Prime Group"
 123
 124         # NIST Elliptic Curve Groups
 125         [ECP192]="192 bit NIST Elliptic Curve Group"
 126         [ECP224]="224 bit NIST Elliptic Curve Group"
 127         [ECP256]="256 bit NIST Elliptic Curve Group"
 128         [ECP384]="384 bit NIST Elliptic Curve Group"
 129         [ECP521]="521 bit NIST Elliptic Curve Group"
 130
 131         # Brainpool Elliptic Curve Groups
 132         [ECP224BP]="224 bit Brainpool Elliptic Curve Group"
 133         [ECP256BP]="256 bit Brainpool Elliptic Curve Group"
 134         [ECP384BP]="384 bit Brainpool Elliptic Curve Group"
 135         [ECP512BP]="512 bit Brainpool Elliptic Curve Group"
 136
 137         # Curve25519
 138         [CURVE25519]="256 bit Elliptic Curve 25519"
 139 )
 140
 141 # This functions checks if a policy is readonly
 142 # returns true when yes and false when no
 143 vpn_security_policies_check_readonly() {
 144         if isoneof name ${VPN_SECURITY_POLICIES_READONLY}; then
 145                 return ${EXIT_TRUE}
 146         else
 147                 return ${EXIT_FALSE}
 148         fi
 149 }
 150
 151 # This function writes all values to a via ${name} specificated vpn security policy configuration file
 152 vpn_security_policies_write_config() {
 153         assert [ $# -ge 1 ]
 154
 155         local name="${1}"
 156
 157         if ! vpn_security_policy_exists "${name}"; then
 158                 log ERROR "No such vpn security policy: ${name}"
 159                 return ${EXIT_ERROR}
 160         fi
 161
 162         if vpn_security_policies_check_readonly "${name}"; then
 163                 log ERROR "The ${name} vpn security policy cannot be changed."
 164                 return ${EXIT_ERROR}
 165         fi
 166
 167         local path="$(vpn_security_policies_path "${name}")"
 168         if [ ! -w ${path} ]; then
 169                 log ERROR "${path} is not writeable"
 170                 return ${EXIT_ERROR}
 171         fi
 172
 173         if ! settings_write "${path}" ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}; then
 174                 log ERROR "Could not write configuration settings for vpn security policy ${name}"
 175                 return ${EXIT_ERROR}
 176         fi
 177
 178         # TODO everytime we successfully write a config we should call some trigger to take the changes into effect
 179 }
 180
 181 # This funtion writes the value for one key to a via ${name} specificated vpn security policy configuration file
 182 vpn_security_policies_write_config_key() {
 183         assert [ $# -ge 3 ]
 184
 185         local name=${1}
 186         local key=${2}
 187         shift 2
 188
 189         local value="$@"
 190
 191         if ! vpn_security_policy_exists "${name}"; then
 192                 log ERROR "No such vpn security policy: ${name}"
 193                 return ${EXIT_ERROR}
 194         fi
 195
 196         log DEBUG "Set '${key}' to new value '${value}' in vpn security policy ${name}"
 197
 198         local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
 199
 200         # Read the config settings
 201         if ! vpn_security_policies_read_config "${name}"; then
 202                 return ${EXIT_ERROR}
 203         fi
 204
 205         # Set the key to a new value
 206         assign "${key}" "${value}"
 207
 208         if ! vpn_security_policies_write_config "${name}"; then
 209                 return ${EXIT_ERROR}
 210         fi
 211
 212         return ${EXIT_TRUE}
 213 }
 214
 215 # Reads one or more keys out of a settings file or all if no key is provided.
 216 vpn_security_policies_read_config() {
 217         assert [ $# -ge 1 ]
 218
 219         local name="${1}"
 220         shift 1
 221
 222         if ! vpn_security_policy_exists "${name}"; then
 223                 log ERROR "No such vpn security policy: ${name}"
 224                 return ${EXIT_ERROR}
 225         fi
 226
 227
 228         local args
 229         if [ $# -eq 0 ] && [ -n "${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}" ]; then
 230                 list_append args ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
 231         else
 232                 list_append args $@
 233         fi
 234
 235         local path="$(vpn_security_policies_path ${name})"
 236
 237         if ! settings_read "${path}" ${args}; then
 238                 log ERROR "Could not read settings for vpn security policy ${name}"
 239                 return ${EXIT_ERROR}
 240         fi
 241 }
 242
 243 # Returns the path to a the configuration fora given name
 244 vpn_security_policies_path() {
 245         assert [ $# -eq 1 ]
 246
 247         local name=${1}
 248
 249         if vpn_security_policies_check_readonly "${name}"; then
 250                 echo "${NETWORK_SHARE_DIR}/vpn/security-policies/${name}"
 251         else
 252                 echo "${NETWORK_CONFIG_DIR}/vpn/security-policies/${name}"
 253         fi
 254 }
 255
 256 # Print the content of a vpn security policy configuration file in a nice way
 257 vpn_security_policies_show() {
 258         assert [ $# -eq 1 ]
 259
 260         local name=${1}
 261
 262         local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
 263         if ! vpn_security_policies_read_config ${name}; then
 264                 return ${EXIT_ERROR}
 265         fi
 266
 267         cli_print_fmt1 0 "Security Policy: ${name}"
 268         cli_space
 269
 270         # This could be done in a loop but a loop is much more complicated
 271         # because we print 'Group Types' but the variable is named 'GROUP_TYPES'
 272         cli_print_fmt1 1 "Ciphers:"
 273         local cipher
 274         for cipher in ${CIPHER}; do
 275                 cli_print_fmt1 2 "${VPN_SUPPORTED_CIPHERS[${cipher}]-${cipher}}"
 276         done
 277         cli_space
 278
 279         cli_print_fmt1 1 "Integrity:"
 280         local integrity
 281         for integrity in ${INTEGRITY}; do
 282                 cli_print_fmt1 2 "${VPN_SUPPORTED_INTEGRITY[${integrity}]-${integrity}}"
 283         done
 284         cli_space
 285
 286         cli_print_fmt1 1 "Group Types:"
 287         cli_print_fmt1 2 "${GROUP_TYPE}"
 288         cli_space
 289
 290         cli_print_fmt1 1 "Key Exchange:" "${KEY_EXCHANGE}"
 291
 292         # Key Lifetime
 293         if isinteger LIFETIME && [ ${LIFETIME} -gt 0 ]; then
 294                 cli_print_fmt1 1 "Key Lifetime:" "$(format_time ${LIFETIME})"
 295         else
 296                 log ERROR "The value for Key Lifetime is not a valid integer greater zero."
 297         fi
 298
 299         # PFS
 300         if enabled PFS; then
 301                 cli_print_fmt1 1 "Perfect Forward Secrecy:" "enabled"
 302         else
 303                 cli_print_fmt1 1 "Perfect Forward Secrecy:" "disabled"
 304         fi
 305         cli_space
 306
 307         # Compression
 308         if enabled COMPRESSION; then
 309                 cli_print_fmt1 1 "Compression:" "enabled"
 310         else
 311                 cli_print_fmt1 1 "Compression:" "disabled"
 312         fi
 313         cli_space
 314 }
 315
 316 # This function checks if a vpn security policy exists
 317 # Returns True when yes and false when not
 318 vpn_security_policy_exists() {
 319         assert [ $# -eq 1 ]
 320
 321         local name=${1}
 322
 323         local path=$(vpn_security_policies_path "${name}")
 324
 325         [ -f ${path} ] && return ${EXIT_TRUE} || return ${EXIT_FALSE}
 326 }
 327
 328
 329 # This function parses the parameters for the 'cipher' command
 330 vpn_security_policies_cipher(){
 331         local name=${1}
 332         shift
 333
 334         if [ $# -eq 0 ]; then
 335                 log ERROR "You must pass at least one value after cipher"
 336                 return ${EXIT_ERROR}
 337         fi
 338
 339         local CIPHER
 340         if ! vpn_security_policies_read_config ${name} "CIPHER"; then
 341                 return ${EXIT_ERROR}
 342         fi
 343
 344         # Remove duplicated entries to proceed the list safely
 345         CIPHER="$(list_unique ${CIPHER})"
 346
 347         while [ $# -gt 0 ]; do
 348                 case "${1}" in
 349                         -*)
 350                                 value=${1#-}
 351                                 # Check if the cipher is in the list of ciphers and
 352                                 # check if the list has after removing this cipher at least one valid value
 353                                 if list_match ${value} ${CIPHER}; then
 354                                         list_remove CIPHER ${value}
 355                                 else
 356                                         # We do not break here because this error does not break the processing of the next maybe valid values.
 357                                         log ERROR "Can not remove ${value} from the list of Ciphers because ${value} is not in the list."
 358                                 fi
 359                                 ;;
 360                         +*)
 361                                 value=${1#+}
 362                                 # Check if the Ciphers is in the list of supported ciphers.
 363                                 if ! isoneof value ${!VPN_SUPPORTED_CIPHERS[@]}; then
 364                                         # We do not break here because this error does not break the processing of the next maybe valid values.
 365                                         log ERROR "${value} is not a supported cipher and can thats why not added to the list of ciphers."
 366                                 else
 367                                         if list_match ${value} ${CIPHER}; then
 368                                                 log WARNING "${value} is already in the list of ciphers of this policy."
 369                                         else
 370                                                 list_append CIPHER ${value}
 371                                         fi
 372                                 fi
 373                                 ;;
 374                 esac
 375                 shift
 376         done
 377
 378         # Check if the list contain at least one valid cipher
 379         if [ $(list_length ${CIPHER}) -ge 1 ]; then
 380                 if ! vpn_security_policies_write_config_key ${name} "CIPHER" ${CIPHER}; then
 381                         log ERROR "The changes for the vpn security policy ${name} could not be written."
 382                 fi
 383         else
 384                 log ERROR "After proceding all ciphers the list is empty and thats why no changes are written."
 385                 return ${EXIT_ERROR}
 386         fi
 387 }
 388
 389 # This function parses the parameters for the 'compression' command
 390 vpn_security_policies_compression(){
 391         local name=${1}
 392         local value=${2}
 393
 394         # Check if we get only one argument after compression <name>
 395         if [ ! $# -eq 2 ]; then
 396                 log ERROR "The number of arguments do not match. Only one argument after compression is allowed."
 397                 return ${EXIT_ERROR}
 398         fi
 399
 400         if ! isbool value; then
 401                 # We suggest only two values to avoid overburding the user.
 402                 log ERROR "Invalid Argument ${value}"
 403                 return ${EXIT_ERROR}
 404         fi
 405
 406         vpn_security_policies_write_config_key "${name}" "COMPRESSION" "${value}"
 407 }
 408
 409 # This function parses the parameters for the 'group-type' command
 410 vpn_security_policies_group_type(){
 411         local name=${1}
 412         shift
 413
 414         if [ $# -eq 0 ]; then
 415                 log ERROR "You must pass at least one value after group-type"
 416                 return ${EXIT_ERROR}
 417         fi
 418
 419         local GROUP_TYPE
 420         if ! vpn_security_policies_read_config ${name} "GROUP_TYPE"; then
 421                 return ${EXIT_ERROR}
 422         fi
 423
 424         # Remove duplicated entries to proceed the list safely
 425         GROUP_TYPE="$(list_unique ${GROUP_TYPE})"
 426
 427         while [ $# -gt 0 ]; do
 428                 case "${1}" in
 429                         -*)
 430                                 value=${1#-}
 431                                 # Check if the group type is in the list of group types and
 432                                 # check if the list has after removing this group type at leatst one valid value
 433                                 if list_match ${value} ${GROUP_TYPE}; then
 434                                         list_remove GROUP_TYPE ${value}
 435                                 else
 436                                         # We do not break here because this error does not break the processing of the next maybe valid values.
 437                                         log ERROR "Can not remove ${value} from the list of group types because ${value} is not in the list."
 438                                 fi
 439                                 ;;
 440                         +*)
 441                                 value=${1#+}
 442                                 # Check if the group type is in the list of supported group types.
 443                                 if ! isoneof value ${!VPN_SUPPORTED_GROUP_TYPES[@]}; then
 444                                         # We do not break here because the processing of other maybe valid values are indepent from this error.
 445                                         log ERROR "${value} is not a supported group type and can thats why not added to the list of group types."
 446                                 else
 447                                         if list_match ${value} ${GROUP_TYPE}; then
 448                                                 log WARNING "${value} is already in the list of group-types of this policy."
 449                                         else
 450                                                 list_append GROUP_TYPE ${value}
 451                                         fi
 452                                 fi
 453                                 ;;
 454                 esac
 455                 shift
 456         done
 457
 458         # Check if the list contain at least one valid group-type
 459         if [ $(list_length ${GROUP_TYPE}) -ge 1 ]; then
 460                 if ! vpn_security_policies_write_config_key ${name} "GROUP_TYPE" ${GROUP_TYPE}; then
 461                         log ERROR "The changes for the vpn security policy ${name} could not be written."
 462                 fi
 463         else
 464                 log ERROR "After proceding all group types the list is empty and thats why no changes are written."
 465                 return ${EXIT_ERROR}
 466         fi
 467 }
 468
 469 # This function parses the parameters for the 'integrity' command
 470 vpn_security_policies_integrity(){
 471         local name=${1}
 472         shift
 473
 474         if [ $# -eq 0 ]; then
 475                 log ERROR "You must pass at least one value after integrity."
 476                 return ${EXIT_ERROR}
 477         fi
 478
 479         local INTEGRITY
 480         if ! vpn_security_policies_read_config ${name} "INTEGRITY"; then
 481                 return ${EXIT_ERROR}
 482         fi
 483
 484         # Remove duplicated entries to proceed the list safely
 485         INTEGRITY="$(list_unique ${INTEGRITY})"
 486
 487         while [ $# -gt 0 ]; do
 488                 case "${1}" in
 489                         -*)
 490                                 value=${1#-}
 491                                 # Check if the integrity hash is in the list of integrity hashes and
 492                                 # check if the list has after removing this  integrity hash at least one valid value
 493                                 if list_match ${value} ${INTEGRITY}; then
 494                                         list_remove INTEGRITY ${value}
 495                                 else
 496                                         # We do not break here because the processing of other maybe valid values are indepent from this error.
 497                                         log ERROR "Can not remove ${value} from the list of integrity hashes because ${value} is not in the list."
 498                                 fi
 499                                 ;;
 500                         +*)
 501                                 value=${1#+}
 502                                 # Check if the Ciphers is in the list of supported integrity hashes.
 503                                 if ! isoneof value ${!VPN_SUPPORTED_INTEGRITY[@]}; then
 504                                         # We do not break here because the processing of other maybe valid values are indepent from this error.
 505                                         log ERROR "${value} is not a supported integrity hash and can thats why not added to the list of integrity hashes."
 506                                 else
 507                                         if list_match ${value} ${INTEGRITY}; then
 508                                                 log WARNING "${value} is already in the list of integrety hashes of this policy."
 509                                         else
 510                                                 list_append INTEGRITY ${value}
 511                                         fi
 512                                 fi
 513                                 ;;
 514                 esac
 515                 shift
 516         done
 517
 518         # Check if the list contain at least one valid group-type
 519         if [ $(list_length ${INTEGRITY}) -ge 1 ]; then
 520                 if ! vpn_security_policies_write_config_key ${name} "INTEGRITY" ${INTEGRITY}; then
 521                         log ERROR "The changes for the vpn security policy ${name} could not be written."
 522                 fi
 523         else
 524                 log ERROR "After proceding all integrity hashes the list is empty and thats why no changes are written."
 525                 return ${EXIT_ERROR}
 526         fi
 527 }
 528
 529 # This function parses the parameters for the 'key-exchange' command
 530 vpn_security_policies_key_exchange() {
 531         local name=${1}
 532         local value=${2}
 533
 534         # Check if we get only one argument after key-exchange <name>
 535         if [ ! $# -eq 2 ]; then
 536                 log ERROR "The number of arguments do not match. Only argument after key-exchange is allowed."
 537                 return ${EXIT_ERROR}
 538         fi
 539
 540         if ! isoneof value "ikev1" "ikev2" "IKEV1" "IKEV2"; then
 541                 log ERROR "Invalid Argument ${value}"
 542                 return ${EXIT_ERROR}
 543         fi
 544
 545         vpn_security_policies_write_config_key "${name}" "KEY_EXCHANGE" "${value,,}"
 546 }
 547
 548 # This function parses the parameters for the 'lifetime' command.
 549 vpn_security_policies_lifetime(){
 550         local name=${1}
 551         shift
 552
 553         local value=$@
 554
 555         # Check if we get only one argument after lifetime <name>
 556         if [ ! $# -ge 1 ]; then
 557                 log ERROR "The number of arguments do not match you must provide at least one integer value or a valid time with the format  <hours>h <minutes>m <seconds>s"
 558                 return ${EXIT_ERROR}
 559         fi
 560
 561         if ! isinteger value; then
 562                 value=$(parse_time $@)
 563                 if [ ! $? -eq 0 ]; then
 564                         log ERROR "Parsing the passed time was not sucessful please check the passed values."
 565                         return ${EXIT_ERROR}
 566                 fi
 567         fi
 568
 569         if [ ${value} -le 0 ]; then
 570                 log ERROR "The passed time value must be in the sum greater zero seconds."
 571                 return ${EXIT_ERROR}
 572         fi
 573
 574         vpn_security_policies_write_config_key "${name}" "LIFETIME" "${value}"
 575 }
 576
 577 # This function parses the parameters for the 'pfs' command
 578 vpn_security_policies_pfs(){
 579         local name=${1}
 580         local value=${2}
 581
 582         # Check if we get only one argument after pfs <name>
 583         if [ ! $# -eq 2 ]; then
 584                 log ERROR "The number of arguments do not match. Only argument after pfs is allowed."
 585                 return ${EXIT_ERROR}
 586         fi
 587
 588         if [ ! $# -eq 2 ] || ! isbool value; then
 589                 # We suggest only two values to avoid overburding the user.
 590                 log ERROR "Invalid Argument ${value}"
 591                 return ${EXIT_ERROR}
 592         fi
 593
 594         vpn_security_policies_write_config_key "${name}" "PFS" "${value}"
 595 }
 596
 597 # This function checks if a vpn security policy name is valid
 598 # Allowed are only A-Za-z0-9
 599 vpn_security_policies_check_name() {
 600         assert [ $# -eq 1 ]
 601
 602         local name=${1}
 603
 604         [[ ${name} =~ [^[:alnum:]$] ]]
 605 }
 606
 607 # Function that creates based on the paramters one ore more new vpn security policies
 608 vpn_security_policies_new() {
 609         if [ $# -gt 1 ]; then
 610                 error "Too many arguments"
 611                 return ${EXIT_ERROR}
 612         fi
 613
 614         local name="${1}"
 615         if ! isset name; then
 616                 error "Please provide a name"
 617                 return ${EXIT_ERROR}
 618         fi
 619
 620         # Check for duplicates
 621         if vpn_security_policy_exists "${name}"; then
 622                 error "The VPN security policy with name ${name} already exists"
 623                 return ${EXIT_ERROR}
 624         fi
 625
 626         # Check if name is valid
 627         if  vpn_security_policies_check_name "${name}"; then
 628                 error "'${name}' contains illegal characters"
 629                 return ${EXIT_ERROR}
 630         fi
 631
 632         # Check if we have a read-only policy with the same name
 633         if vpn_security_policies_check_readonly "${name}"; then
 634                 error "The VPN security policy ${name} is read-only"
 635                 return ${EXIT_ERROR}
 636         fi
 637
 638         # Check if our source policy exists
 639         if ! vpn_security_policy_exists "${VPN_DEFAULT_SECURITY_POLICY}"; then
 640                 error "Default VPN Security Policy '${VPN_DEFAULT_SECURITY_POLICY}' does not exist"
 641                 return ${EXIT_ERROR}
 642         fi
 643
 644         log DEBUG "Creating VPN Security Policy ${name}"
 645
 646         if copy "$(vpn_security_policies_path "${VPN_DEFAULT_SECURITY_POLICY}")"
 647                         "$(vpn_security_policies_path ${name})"; then
 648                 log INFO "VPN Security Policy ${name} successfully created"
 649         else
 650                 log ERROR "Could not create VPN Security Policy ${name}"
 651                 return ${EXIT_ERROR}
 652         fi
 653
 654         # Show the newly created policy
 655         vpn_security_policies_show "${name}"
 656 }
 657
 658 # Function that deletes based on the passed parameters one ore more vpn security policies
 659 vpn_security_policies_destroy() {
 660         local name
 661         for name in $@; do
 662                 if ! vpn_security_policy_exists ${name}; then
 663                         log ERROR "The vpn security policy ${name} does not exist."
 664                         continue
 665                 fi
 666
 667                 if vpn_security_policies_check_readonly ${name}; then
 668                         log ERROR "The vpn security policy ${name} cannot be deleted."
 669                         continue
 670                 fi
 671
 672                 log DEBUG "Deleting vpn security policy ${name}"
 673                 settings_remove $(vpn_security_policies_path ${name})
 674         done
 675 }