[people/ms/network.git] / src / functions / functions.vpn-security-policies

#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2017  IPFire Network Development Team                         #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
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# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
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###############################################################################

VPN_SECURITY_POLICIES_CONFIG_SETTINGS="CIPHER COMPRESSION GROUP_TYPE INTEGRITY KEY_EXCHANGE LIFETIME PFS"
VPN_SECURITY_POLICIES_READONLY="system performance"

VPN_DEFAULT_SECURITY_POLICY="system"

declare -A VPN_SUPPORTED_CIPHERS=(
	# 3DES-CBC
	[3DES-CBC]="168 bit 3DES-EDE-CBC"

	# AES-CBC
	[AES256-CBC]="256 bit AES-CBC"
	[AES192-CBC]="192 bit AES-CBC"
	[AES128-CBC]="128 bit AES-CBC"

	# AES-CTR
	[AES256-CTR]="256 bit AES-COUNTER"
	[AES192-CTR]="192 bit AES-COUNTER"
	[AES128-CTR]="128 bit AES-COUNTER"

	# AES-GCM
	[AES256-GCM128]="256 bit AES-GCM with 128 bit ICV"
	[AES192-GCM128]="192 bit AES-GCM with 128 bit ICV"
	[AES128-GCM128]="128 bit AES-GCM with 128 bit ICV"
	[AES256-GCM96]="256 bit AES-GCM with 96 bit ICV"
	[AES192-GCM96]="192 bit AES-GCM with 96 bit ICV"
	[AES128-GCM96]="128 bit AES-GCM with 96 bit ICV"
	[AES256-GCM64]="256 bit AES-GCM with 64 bit ICV"
	[AES192-GCM64]="192 bit AES-GCM with 64 bit ICV"
	[AES128-GCM64]="128 bit AES-GCM with 64 bit ICV"

	# AES-CCM
	[AES256-CCM128]="256 bit AES-CCM with 128 bit ICV"
	[AES192-CCM128]="192 bit AES-CCM with 128 bit ICV"
	[AES128-CCM128]="128 bit AES-CCM with 128 bit ICV"
	[AES256-CCM96]="256 bit AES-CCM with 96 bit ICV"
	[AES192-CCM96]="192 bit AES-CCM with 96 bit ICV"
	[AES128-CCM96]="128 bit AES-CCM with 96 bit ICV"
	[AES256-CCM64]="256 bit AES-CCM with 64 bit ICV"
	[AES192-CCM64]="192 bit AES-CCM with 64 bit ICV"
	[AES128-CCM64]="128 bit AES-CCM with 64 bit ICV"

	# CAMELLIA-CBC
	[CAMELLIA256-CBC]="256 bit CAMELLIA-CBC"
	[CAMELLIA192-CBC]="192 bit CAMELLIA-CBC"
	[CAMELLIA128-CBC]="128 bit CAMELLIA-CBC"

	# CAMELLIA-CTR
	[CAMELLIA256-CTR]="256 bit CAMELLIA-COUNTER"
	[CAMELLIA192-CTR]="192 bit CAMELLIA-COUNTER"
	[CAMELLIA128-CTR]="128 bit CAMELLIA-COUNTER"

	# CAMELLIA-GCM
	[CAMELLIA256-GCM128]="256 bit CAMELLIA-GCM with 128 bit ICV"
	[CAMELLIA192-GCM128]="192 bit CAMELLIA-GCM with 128 bit ICV"
	[CAMELLIA128-GCM128]="128 bit CAMELLIA-GCM with 128 bit ICV"
	[CAMELLIA256-GCM96]="256 bit CAMELLIA-GCM with 96 bit ICV"
	[CAMELLIA192-GCM96]="192 bit CAMELLIA-GCM with 96 bit ICV"
	[CAMELLIA128-GCM96]="128 bit CAMELLIA-GCM with 96 bit ICV"
	[CAMELLIA256-GCM64]="256 bit CAMELLIA-GCM with 64 bit ICV"
	[CAMELLIA192-GCM64]="192 bit CAMELLIA-GCM with 64 bit ICV"
	[CAMELLIA128-GCM64]="128 bit CAMELLIA-GCM with 64 bit ICV"

	# CAMELLIA-CCM
	[CAMELLIA256-CCM128]="256 bit CAMELLIA-CCM with 128 bit ICV"
	[CAMELLIA192-CCM128]="192 bit CAMELLIA-CCM with 128 bit ICV"
	[CAMELLIA128-CCM128]="128 bit CAMELLIA-CCM with 128 bit ICV"
	[CAMELLIA256-CCM96]="256 bit CAMELLIA-CCM with 96 bit ICV"
	[CAMELLIA192-CCM96]="192 bit CAMELLIA-CCM with 96 bit ICV"
	[CAMELLIA128-CCM96]="128 bit CAMELLIA-CCM with 96 bit ICV"
	[CAMELLIA256-CCM64]="256 bit CAMELLIA-CCM with 64 bit ICV"
	[CAMELLIA192-CCM64]="192 bit CAMELLIA-CCM with 64 bit ICV"
	[CAMELLIA128-CCM64]="128 bit CAMELLIA-CCM with 64 bit ICV"
)

declare -A CIPHER_TO_STRONGSWAN=(
	# 3DES-CBC
	[3DES-CBC]="3des"

	# AES-CBC
	[AES256-CBC]="aes256"
	[AES192-CBC]="aes192"
	[AES128-CBC]="aes128"

	# AES-CTR
	[AES256-CTR]="aes256ctr"
	[AES192-CTR]="aes192ctr"
	[AES128-CTR]="aes128ctr"

	# AES-GCM
	[AES256-GCM128]="aes256gcm128"
	[AES192-GCM128]="aes192gcm128"
	[AES128-GCM128]="aes128gcm128"
	[AES256-GCM96]="aes256gcm96"
	[AES192-GCM96]="aes192gcm96"
	[AES128-GCM96]="aes128gcm96"
	[AES256-GCM64]="aes256gcm64"
	[AES192-GCM64]="aes192gcm64"
	[AES128-GCM64]="aes128gcm64"

	# AES-CCM
	[AES256-CCM128]="aes256ccm128"
	[AES192-CCM128]="aes192ccm128"
	[AES128-CCM128]="aes128ccm128"
	[AES256-CCM96]="aes256ccm96"
	[AES192-CCM96]="aes192ccm96"
	[AES128-CCM96]="aes128ccm96"
	[AES256-CCM64]="aes256ccm64"
	[AES192-CCM64]="aes192ccm64"
	[AES128-CCM64]="aes128ccm64"

	# CAMELLIA-CBC
	[CAMELLIA256-CBC]="camellia256"
	[CAMELLIA192-CBC]="camellia192"
	[CAMELLIA128-CBC]="camellia128"

	# CAMELLIA-CTR
	[CAMELLIA256-CTR]="camellia256ctr"
	[CAMELLIA192-CTR]="camellia192ctr"
	[CAMELLIA128-CTR]="camellia128ctr"

	# CAMELLIA-GCM
	[CAMELLIA256-GCM128]="camellia256gcm128"
	[CAMELLIA192-GCM128]="camellia192gcm128"
	[CAMELLIA128-GCM128]="camellia128gcm128"
	[CAMELLIA256-GCM96]="camellia256gcm96"
	[CAMELLIA192-GCM96]="camellia192gcm96"
	[CAMELLIA128-GCM96]="camellia128gcm96"
	[CAMELLIA256-GCM64]="camellia256gcm64"
	[CAMELLIA192-GCM64]="camellia192gcm64"
	[CAMELLIA128-GCM64]="camellia128gcm64"

	# CAMELLIA-CCM
	[CAMELLIA256-CCM128]="camellia256ccm128"
	[CAMELLIA192-CCM128]="camellia192ccm128"
	[CAMELLIA128-CCM128]="camellia128ccm128"
	[CAMELLIA256-CCM96]="camellia256ccm96"
	[CAMELLIA192-CCM96]="camellia192ccm96"
	[CAMELLIA128-CCM96]="camellia128ccm96"
	[CAMELLIA256-CCM64]="camellia256ccm64"
	[CAMELLIA192-CCM64]="camellia192ccm64"
	[CAMELLIA128-CCM64]="camellia128ccm64"
)

declare -A VPN_SUPPORTED_INTEGRITY=(
	[MD5]="MD5-HMAC"

	# SHA
	[SHA1]="SHA1-HMAC"
	[SHA512]="512 bit SHA2-HMAC"
	[SHA384]="384 bit SHA2-HMAC"
	[SHA256]="256 bit SHA2-HMAC"

	# AES
	[AES-XCBC]="AES-XCBC"
	[AES-CMAC]="AES-CMAC"
	[AES256-GMAC]="256 bit AES-GMAC"
	[AES192-GMAC]="192 bit AES-GMAC"
	[AES128-GMAC]="128 bit AES-GMAC"
)

declare -A INTEGRITY_TO_STRONGSWAN=(
	[MD5]="md5"

	# SHA
	[SHA1]="sha1"
	[SHA512]="sha512"
	[SHA384]="sha384"
	[SHA256]="sha256"

	# AES
	[AES-XCBC]="aesxcbc"
	[AES-CMAC]="aescmac"
	[AES256-GMAC]="aes256gmac"
	[AES192-GMAC]="aes192gmac"
	[AES128-GMAC]="aes128gmac"
)

declare -A VPN_SUPPORTED_GROUP_TYPES=(
	# Regular Groups
	[MODP768]="768 bit Modulo Prime Group"
	[MODP1024]="1024 bit Modulo Prime Group"
	[MODP1536]="1536 bit Modulo Prime Group"
	[MODP2048]="2048 bit Modulo Prime Group"
	[MODP3072]="3072 bit Modulo Prime Group"
	[MODP4096]="4096 bit Modulo Prime Group"
	[MODP6144]="6144 bit Modulo Prime Group"
	[MODP8192]="8192 bit Modulo Prime Group"

	# NIST Elliptic Curve Groups
	[ECP192]="192 bit NIST Elliptic Curve Group"
	[ECP224]="224 bit NIST Elliptic Curve Group"
	[ECP256]="256 bit NIST Elliptic Curve Group"
	[ECP384]="384 bit NIST Elliptic Curve Group"
	[ECP521]="521 bit NIST Elliptic Curve Group"

	# Brainpool Elliptic Curve Groups
	[ECP224BP]="224 bit Brainpool Elliptic Curve Group"
	[ECP256BP]="256 bit Brainpool Elliptic Curve Group"
	[ECP384BP]="384 bit Brainpool Elliptic Curve Group"
	[ECP512BP]="512 bit Brainpool Elliptic Curve Group"

	# Curve25519
	[CURVE25519]="256 bit Elliptic Curve 25519"
)

declare -A GROUP_TYPE_TO_STRONGSWAN=(
	# Regular Groups
	[MODP768]="modp768"
	[MODP1024]="modp1024"
	[MODP1536]="modp1536"
	[MODP2048]="modp2048"
	[MODP3072]="modp3072"
	[MODP4096]="modp4096"
	[MODP6144]="modp6144"
	[MODP8192]="modp8192"

	# NIST Elliptic Curve Groups
	[ECP192]="ecp192"
	[ECP224]="ecp224"
	[ECP256]="ecp256"
	[ECP384]="ecp384"
	[ECP521]="ecp521"

	# Brainpool Elliptic Curve Groups
	[ECP224BP]="ecp224bp"
	[ECP256BP]="ecp256bp"
	[ECP384BP]="ecp384bp"
	[ECP512BP]="ecp512bp"

	# Curve25519
	[CURVE25519]="curve25519"
)

cli_vpn_security_policies() {
	local action
	local security_policy

	if vpn_security_policy_exists ${1}; then
		security_policy=${1}
		key=${2}
		shift 2

		case "${key}" in
			cipher|compression|integrity|lifetime|pfs|show)
				vpn_security_policies_${key} ${security_policy} $@
				;;
			group-type)
				vpn_security_policies_group_type ${security_policy} $@
				;;
			key-exchange)
				vpn_security_policies_key_exchange ${security_policy} $@
				;;
			*)
				error "Unrecognized argument: ${key}"
				exit ${EXIT_ERROR}
				;;
		esac
	else
		action=${1}
		shift

		case "${action}" in
			new)
				vpn_security_policies_new $@
				;;
			destroy)
				vpn_security_policies_destroy $@
				;;
			""|*)
				if [ -n "${action}" ]; then
					error "Unrecognized argument: '${action}'"
				fi
				exit ${EXIT_ERROR}
				;;
		esac
	fi
}

# This functions checks if a policy is readonly
# returns true when yes and false when no
vpn_security_policies_check_readonly() {
	if isoneof name ${VPN_SECURITY_POLICIES_READONLY}; then
		return ${EXIT_TRUE}
	else
		return ${EXIT_FALSE}
	fi
}

# This function writes all values to a via ${name} specificated vpn security policy configuration file
vpn_security_policies_write_config() {
	assert [ $# -ge 1 ]

	local name="${1}"

	if ! vpn_security_policy_exists "${name}"; then
		log ERROR "No such vpn security policy: ${name}"
		return ${EXIT_ERROR}
	fi

	if vpn_security_policies_check_readonly "${name}"; then
		log ERROR "The ${name} vpn security policy cannot be changed."
		return ${EXIT_ERROR}
	fi

	local path="$(vpn_security_policies_path "${name}")"
	if [ ! -w ${path} ]; then
		log ERROR "${path} is not writeable"
		return ${EXIT_ERROR}
	fi

	if ! settings_write "${path}" ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}; then
		log ERROR "Could not write configuration settings for vpn security policy ${name}"
		return ${EXIT_ERROR}
	fi

	# TODO everytime we successfully write a config we should call some trigger to take the changes into effect
}

# This funtion writes the value for one key to a via ${name} specificated vpn security policy configuration file
vpn_security_policies_write_config_key() {
	assert [ $# -ge 3 ]

	local name=${1}
	local key=${2}
	shift 2

	local value="$@"

	if ! vpn_security_policy_exists "${name}"; then
		log ERROR "No such vpn security policy: ${name}"
		return ${EXIT_ERROR}
	fi

	log DEBUG "Set '${key}' to new value '${value}' in vpn security policy ${name}"

	local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}

	# Read the config settings
	if ! vpn_security_policies_read_config "${name}"; then
		return ${EXIT_ERROR}
	fi

	# Set the key to a new value
	assign "${key}" "${value}"

	if ! vpn_security_policies_write_config "${name}"; then
		return ${EXIT_ERROR}
	fi

	return ${EXIT_TRUE}
}

# Reads one or more keys out of a settings file or all if no key is provided.
vpn_security_policies_read_config() {
	assert [ $# -ge 1 ]

	local name="${1}"
	shift 1

	if ! vpn_security_policy_exists "${name}"; then
		log ERROR "No such vpn security policy: ${name}"
		return ${EXIT_ERROR}
	fi


	local args
	if [ $# -eq 0 ] && [ -n "${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}" ]; then
		list_append args ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
	else
		list_append args $@
	fi

	local path="$(vpn_security_policies_path ${name})"

	if ! settings_read "${path}" ${args}; then
		log ERROR "Could not read settings for vpn security policy ${name}"
		return ${EXIT_ERROR}
	fi
}

# Returns the path to a the configuration fora given name
vpn_security_policies_path() {
	assert [ $# -eq 1 ]

	local name=${1}

	if vpn_security_policies_check_readonly "${name}"; then
		echo "${NETWORK_SHARE_DIR}/vpn/security-policies/${name}"
	else
		echo "${NETWORK_CONFIG_DIR}/vpn/security-policies/${name}"
	fi
}

# Print the content of a vpn security policy configuration file in a nice way
vpn_security_policies_show() {
	assert [ $# -eq 1 ]

	local name=${1}

	local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
	if ! vpn_security_policies_read_config ${name}; then
		return ${EXIT_ERROR}
	fi

	cli_print_fmt1 0 "Security Policy: ${name}"
	cli_space

	# This could be done in a loop but a loop is much more complicated
	# because we print 'Group Types' but the variable is named 'GROUP_TYPES'
	cli_print_fmt1 1 "Ciphers:"
	local cipher
	for cipher in ${CIPHER}; do
		cli_print_fmt1 2 "${VPN_SUPPORTED_CIPHERS[${cipher}]-${cipher}}"
	done
	cli_space

	cli_print_fmt1 1 "Integrity:"
	local integrity
	for integrity in ${INTEGRITY}; do
		cli_print_fmt1 2 "${VPN_SUPPORTED_INTEGRITY[${integrity}]-${integrity}}"
	done
	cli_space

	cli_print_fmt1 1 "Group Types:"
	local group_type
	for group_type in ${GROUP_TYPE}; do
		cli_print_fmt1 2 "${VPN_SUPPORTED_GROUP_TYPES[${group_type}]-${group_type}}"
	done
	cli_space

	cli_print_fmt1 1 "Key Exchange:" "${KEY_EXCHANGE}"

	# Key Lifetime
	if isinteger LIFETIME && [ ${LIFETIME} -gt 0 ]; then
		cli_print_fmt1 1 "Key Lifetime:" "$(format_time ${LIFETIME})"
	else
		log ERROR "The value for Key Lifetime is not a valid integer greater zero."
	fi

	# PFS
	if enabled PFS; then
		cli_print_fmt1 1 "Perfect Forward Secrecy:" "enabled"
	else
		cli_print_fmt1 1 "Perfect Forward Secrecy:" "disabled"
	fi
	cli_space

	# Compression
	if enabled COMPRESSION; then
		cli_print_fmt1 1 "Compression:" "enabled"
	else
		cli_print_fmt1 1 "Compression:" "disabled"
	fi
	cli_space
}

# This function checks if a vpn security policy exists
# Returns True when yes and false when not
vpn_security_policy_exists() {
	assert [ $# -eq 1 ]

	local name=${1}

	local path=$(vpn_security_policies_path "${name}")

	[ -f ${path} ] && return ${EXIT_TRUE} || return ${EXIT_FALSE}
}


# This function parses the parameters for the 'cipher' command
vpn_security_policies_cipher(){
	local name=${1}
	shift

	if [ $# -eq 0 ]; then
		log ERROR "You must pass at least one value after cipher"
		return ${EXIT_ERROR}
	fi

	local CIPHER
	if ! vpn_security_policies_read_config ${name} "CIPHER"; then
		return ${EXIT_ERROR}
	fi

	# Remove duplicated entries to proceed the list safely
	CIPHER="$(list_unique ${CIPHER})"

	local ciphers_added
	local ciphers_removed
	local ciphers_set

	while [ $# -gt 0 ]; do
		local arg="${1}"

		case "${arg}" in
			+*)
				list_append ciphers_added "${arg:1}"
				;;
			-*)
				list_append ciphers_removed "${arg:1}"
				;;
			[A-Z0-9]*)
				list_append ciphers_set "${arg}"
				;;
			*)
				error "Invalid argument: ${arg}"
				return ${EXIT_ERROR}
				;;
		esac
		shift
	done

	# Check if the user is trying a mixed operation
	if ! list_is_empty ciphers_set && (! list_is_empty ciphers_added || ! list_is_empty ciphers_removed); then
		error "You cannot reset the cipher list and add or remove ciphers at the same time"
		return ${EXIT_ERROR}
	fi

	# Set new cipher list
	if ! list_is_empty ciphers_set; then
		# Check if all ciphers are valid
		local cipher
		for cipher in ${ciphers_set}; do
			if ! vpn_security_policies_cipher_supported ${cipher}; then
				error "Unsupported cipher: ${cipher}"
				return ${EXIT_ERROR}
			fi
		done

		CIPHER="${ciphers_set}"

	# Perform incremental updates
	else
		local cipher

		# Perform all removals
		for cipher in ${ciphers_removed}; do
			if ! list_remove CIPHER ${cipher}; then
				warning "${cipher} was not on the list and could not be removed"
			fi
		done

		for cipher in ${ciphers_added}; do
			if vpn_security_policies_cipher_supported ${cipher}; then
				if ! list_append_unique CIPHER ${cipher}; then
					warning "${cipher} is already on the cipher list"
				fi
			else
				warning "${cipher} is unknown or unsupported and could not be added"
			fi
		done
	fi

	# Check if the list contain at least one valid cipher
	if list_is_empty CIPHER; then
		error "Cannot save an empty cipher list"
		return ${EXIT_ERROR}
	fi

	# Save everything
	if ! vpn_security_policies_write_config_key ${name} "CIPHER" ${CIPHER}; then
		log ERROR "The changes for the vpn security policy ${name} could not be written."
	fi

	cli_headline 1 "Current cipher list for ${name}:"
	for cipher in ${CIPHER}; do
		cli_print_fmt1 1 "${cipher}" "${VPN_SUPPORTED_CIPHERS[${cipher}]}"
	done
}

# This function parses the parameters for the 'compression' command
vpn_security_policies_compression(){
	local name=${1}
	local value=${2}

	# Check if we get only one argument after compression <name>
	if [ ! $# -eq 2 ]; then
		log ERROR "The number of arguments do not match. Only one argument after compression is allowed."
		return ${EXIT_ERROR}
	fi

	if ! isbool value; then
		# We suggest only two values to avoid overburding the user.
		log ERROR "Invalid Argument ${value}"
		return ${EXIT_ERROR}
	fi

	vpn_security_policies_write_config_key "${name}" "COMPRESSION" "${value}"
}

# This function parses the parameters for the 'group-type' command
vpn_security_policies_group_type(){
	local name=${1}
	shift

	if [ $# -eq 0 ]; then
		log ERROR "You must pass at least one value after group-type"
		return ${EXIT_ERROR}
	fi

	local GROUP_TYPE
	if ! vpn_security_policies_read_config ${name} "GROUP_TYPE"; then
		return ${EXIT_ERROR}
	fi

	# Remove duplicated entries to proceed the list safely
	GROUP_TYPE="$(list_unique ${GROUP_TYPE})"

	while [ $# -gt 0 ]; do
		case "${1}" in
			-*)
				value=${1#-}
				# Check if the group type is in the list of group types and
				# check if the list has after removing this group type at leatst one valid value
				if list_match ${value} ${GROUP_TYPE}; then
					list_remove GROUP_TYPE ${value}
				else
					# We do not break here because this error does not break the processing of the next maybe valid values.
					log ERROR "Can not remove ${value} from the list of group types because ${value} is not in the list."
				fi
				;;
			+*)
				value=${1#+}
				# Check if the group type is in the list of supported group types.
				if ! isoneof value ${!VPN_SUPPORTED_GROUP_TYPES[@]}; then
					# We do not break here because the processing of other maybe valid values are indepent from this error.
					log ERROR "${value} is not a supported group type and can thats why not added to the list of group types."
				else
					if list_match ${value} ${GROUP_TYPE}; then
						log WARNING "${value} is already in the list of group-types of this policy."
					else
						list_append GROUP_TYPE ${value}
					fi
				fi
				;;
		esac
		shift
	done

	# Check if the list contain at least one valid group-type
	if [ $(list_length ${GROUP_TYPE}) -ge 1 ]; then
		if ! vpn_security_policies_write_config_key ${name} "GROUP_TYPE" ${GROUP_TYPE}; then
			log ERROR "The changes for the vpn security policy ${name} could not be written."
		fi
	else
		log ERROR "After proceding all group types the list is empty and thats why no changes are written."
		return ${EXIT_ERROR}
	fi
}

# This function parses the parameters for the 'integrity' command
vpn_security_policies_integrity(){
	local name=${1}
	shift

	if [ $# -eq 0 ]; then
		log ERROR "You must pass at least one value after integrity."
		return ${EXIT_ERROR}
	fi

	local INTEGRITY
	if ! vpn_security_policies_read_config ${name} "INTEGRITY"; then
		return ${EXIT_ERROR}
	fi

	# Remove duplicated entries to proceed the list safely
	INTEGRITY="$(list_unique ${INTEGRITY})"

	while [ $# -gt 0 ]; do
		case "${1}" in
			-*)
				value=${1#-}
				# Check if the integrity hash is in the list of integrity hashes and
				# check if the list has after removing this  integrity hash at least one valid value
				if list_match ${value} ${INTEGRITY}; then
					list_remove INTEGRITY ${value}
				else
					# We do not break here because the processing of other maybe valid values are indepent from this error.
					log ERROR "Can not remove ${value} from the list of integrity hashes because ${value} is not in the list."
				fi
				;;
			+*)
				value=${1#+}
				# Check if the Ciphers is in the list of supported integrity hashes.
				if ! isoneof value ${!VPN_SUPPORTED_INTEGRITY[@]}; then
					# We do not break here because the processing of other maybe valid values are indepent from this error.
					log ERROR "${value} is not a supported integrity hash and can thats why not added to the list of integrity hashes."
				else
					if list_match ${value} ${INTEGRITY}; then
						log WARNING "${value} is already in the list of integrety hashes of this policy."
					else
						list_append INTEGRITY ${value}
					fi
				fi
				;;
		esac
		shift
	done

	# Check if the list contain at least one valid group-type
	if [ $(list_length ${INTEGRITY}) -ge 1 ]; then
		if ! vpn_security_policies_write_config_key ${name} "INTEGRITY" ${INTEGRITY}; then
			log ERROR "The changes for the vpn security policy ${name} could not be written."
		fi
	else
		log ERROR "After proceding all integrity hashes the list is empty and thats why no changes are written."
		return ${EXIT_ERROR}
	fi
}

# This function parses the parameters for the 'key-exchange' command
vpn_security_policies_key_exchange() {
	local name=${1}
	local value=${2}

	# Check if we get only one argument after key-exchange <name>
	if [ ! $# -eq 2 ]; then
		log ERROR "The number of arguments do not match. Only argument after key-exchange is allowed."
		return ${EXIT_ERROR}
	fi

	if ! isoneof value "ikev1" "ikev2" "IKEV1" "IKEV2"; then
		log ERROR "Invalid Argument ${value}"
		return ${EXIT_ERROR}
	fi

	vpn_security_policies_write_config_key "${name}" "KEY_EXCHANGE" "${value,,}"
}

# This function parses the parameters for the 'lifetime' command.
vpn_security_policies_lifetime(){
	local name=${1}
	shift

	local value=$@

	# Check if we get only one argument after lifetime <name>
	if [ ! $# -ge 1 ]; then
		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"
		return ${EXIT_ERROR}
	fi

	if ! isinteger value; then
		value=$(parse_time $@)
		if [ ! $? -eq 0 ]; then
			log ERROR "Parsing the passed time was not sucessful please check the passed values."
			return ${EXIT_ERROR}
		fi
	fi

	if [ ${value} -le 0 ]; then
		log ERROR "The passed time value must be in the sum greater zero seconds."
		return ${EXIT_ERROR}
	fi

	vpn_security_policies_write_config_key "${name}" "LIFETIME" "${value}"
}

# This function parses the parameters for the 'pfs' command
vpn_security_policies_pfs(){
	local name=${1}
	local value=${2}

	# Check if we get only one argument after pfs <name>
	if [ ! $# -eq 2 ]; then
		log ERROR "The number of arguments do not match. Only argument after pfs is allowed."
		return ${EXIT_ERROR}
	fi

	if [ ! $# -eq 2 ] || ! isbool value; then
		# We suggest only two values to avoid overburding the user.
		log ERROR "Invalid Argument ${value}"
		return ${EXIT_ERROR}
	fi

	vpn_security_policies_write_config_key "${name}" "PFS" "${value}"
}

# This function checks if a vpn security policy name is valid
# Allowed are only A-Za-z0-9
vpn_security_policies_check_name() {
	assert [ $# -eq 1 ]

	local name=${1}

	[[ ${name} =~ [^[:alnum:]$] ]]
}

# Function that creates based on the paramters one ore more new vpn security policies
vpn_security_policies_new() {
	if [ $# -gt 1 ]; then
		error "Too many arguments"
		return ${EXIT_ERROR}
	fi

	local name="${1}"
	if ! isset name; then
		error "Please provide a name"
		return ${EXIT_ERROR}
	fi

	# Check for duplicates
	if vpn_security_policy_exists "${name}"; then
		error "The VPN security policy with name ${name} already exists"
		return ${EXIT_ERROR}
	fi

	# Check if name is valid
	if  vpn_security_policies_check_name "${name}"; then
		error "'${name}' contains illegal characters"
		return ${EXIT_ERROR}
	fi

	# Check if we have a read-only policy with the same name
	if vpn_security_policies_check_readonly "${name}"; then
		error "The VPN security policy ${name} is read-only"
		return ${EXIT_ERROR}
	fi

	# Check if our source policy exists
	if ! vpn_security_policy_exists "${VPN_DEFAULT_SECURITY_POLICY}"; then
		error "Default VPN Security Policy '${VPN_DEFAULT_SECURITY_POLICY}' does not exist"
		return ${EXIT_ERROR}
	fi

	log DEBUG "Creating VPN Security Policy ${name}"

	if copy "$(vpn_security_policies_path "${VPN_DEFAULT_SECURITY_POLICY}")" \
			"$(vpn_security_policies_path ${name})"; then
		log INFO "VPN Security Policy ${name} successfully created"
	else
		log ERROR "Could not create VPN Security Policy ${name}"
		return ${EXIT_ERROR}
	fi

	# Show the newly created policy
	vpn_security_policies_show "${name}"
}

# Function that deletes based on the passed parameters one ore more vpn security policies
vpn_security_policies_destroy() {
	local name
	for name in $@; do
		if ! vpn_security_policy_exists ${name}; then
			log ERROR "The vpn security policy ${name} does not exist."
			continue
		fi

		if vpn_security_policies_check_readonly ${name}; then
			log ERROR "The vpn security policy ${name} cannot be deleted."
			continue
		fi

		log DEBUG "Deleting vpn security policy ${name}"
		settings_remove $(vpn_security_policies_path ${name})
	done
}

vpn_security_policies_cipher_supported() {
	local cipher=${1}

	list_match ${cipher} ${!VPN_SUPPORTED_CIPHERS[@]}
}

vpn_security_policies_cipher_is_aead() {
	local cipher=${1}

	# All CCM and GCM ciphers are AEAD
	string_match "[CG]CM" "${cipher}"
}

vpn_security_policies_make_ah_proposal() {
	local name=${1}

	if ! vpn_security_policy_exists ${name}; then
		return ${EXIT_ERROR}
	fi

	local config_path="$(vpn_security_policies_path ${name})"
	local cache_path="${NETWORK_CACHE_DIR}/vpn/security-policies/${name}/ah-proposal"

	# Get data from cache if possible
	if file_exists "${cache_path}" && ! file_is_newer_than "${config_path}" "${cache_path}"; then
		fread "${cache_path}"
		return ${EXIT_OK}
	fi

	# No or invalid cache data found
	local proposal=$(_vpn_security_policies_make_ah_proposal "${name}")

	# Write proposal to cache
	if ! make_parent_dir "${cache_path}" || ! fwrite "${cache_path}" "${proposal}"; then
		log WARNING "Could not write to cache: ${cache_path}"
	fi

	print "${proposal}"
}

_vpn_security_policies_make_ah_proposal() {
	local name=${1}

	# Read the config settings
	local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
	if ! vpn_security_policies_read_config "${name}"; then
		return ${EXIT_ERROR}
	fi

	local proposals

	local cipher
	for cipher in ${CIPHER}; do
		# Translate cipher
		local _cipher=${CIPHER_TO_STRONGSWAN[${cipher}]}

		if ! isset _cipher; then
			log WARN "Unsupported cipher: ${cipher}"
			continue
		fi

		local integrity
		for integrity in ${INTEGRITY}; do
			local _integrity=${INTEGRITY_TO_STRONGSWAN[${integrity}]}

			if ! isset _integrity; then
				log WARN "Unsupported integrity: ${integrity}"
				continue
			fi

			local group_type
			for group_type in ${GROUP_TYPE}; do
				local _group_type=${GROUP_TYPE_TO_STRONGSWAN[${group_type}]}

				if ! isset _group_type; then
					log WARN "Unsupported group-type: ${group_type}"
					continue
				fi

				# Put everything together
				list_append proposals "${_cipher}-${_integrity}-${_group_type}"
			done
		done
	done

	# Returns as a comma-separated list
	list_join proposals ,
}

vpn_security_policies_make_esp_proposal() {
	local name=${1}

	if ! vpn_security_policy_exists ${name}; then
		return ${EXIT_ERROR}
	fi

	local config_path="$(vpn_security_policies_path ${name})"
	local cache_path="${NETWORK_CACHE_DIR}/vpn/security-policies/${name}/esp-proposal"

	# Get data from cache if possible
	if file_exists "${cache_path}" && ! file_is_newer_than "${config_path}" "${cache_path}"; then
		fread "${cache_path}"
		return ${EXIT_OK}
	fi

	# No or invalid cache data found
	local proposal=$(_vpn_security_policies_make_esp_proposal "${name}")

	# Write proposal to cache
	if ! make_parent_dir "${cache_path}" || ! fwrite "${cache_path}" "${proposal}"; then
		log WARNING "Could not write to cache: ${cache_path}"
	fi

	print "${proposal}"
}

_vpn_security_policies_make_esp_proposal() {
	local name=${1}

	# Read the config settings
	local ${VPN_SECURITY_POLICIES_CONFIG_SETTINGS}
	if ! vpn_security_policies_read_config "${name}"; then
		return ${EXIT_ERROR}
	fi

	local proposals

	local cipher
	for cipher in ${CIPHER}; do
		# Translate cipher
		local _cipher=${CIPHER_TO_STRONGSWAN[${cipher}]}

		if ! isset _cipher; then
			log WARN "Unsupported cipher: ${cipher}"
			continue
		fi

		if vpn_security_policies_cipher_is_aead ${cipher}; then
			local group_type
			for group_type in ${GROUP_TYPE}; do
				local _group_type=${GROUP_TYPE_TO_STRONGSWAN[${group_type}]}

				if ! isset _group_type; then
					log WARN "Unsupported group-type: ${group_type}"
					continue
				fi

				# Put everything together
				list_append proposals "${_cipher}-${_group_type}"
			done
		else
			local integrity
			for integrity in ${INTEGRITY}; do
				local _integrity=${INTEGRITY_TO_STRONGSWAN[${integrity}]}

				if ! isset _integrity; then
					log WARN "Unsupported integrity: ${integrity}"
					continue
				fi

				local group_type
				for group_type in ${GROUP_TYPE}; do
					local _group_type=${GROUP_TYPE_TO_STRONGSWAN[${group_type}]}

					if ! isset _group_type; then
						log WARN "Unsupported group-type: ${group_type}"
						continue
					fi

					# Put everything together
					list_append proposals "${_cipher}-${_integrity}-${_group_type}"
				done
			done
		fi
	done

	# Returns as a comma-separated list
	list_join proposals ,
}

# List all security policies
vpn_security_policies_list_all() {
	local security_policy
	for security_policy in ${NETWORK_SHARE_DIR}/vpn/security-policies/*; do
		[ -f ${security_policy} ] || continue
		basename ${security_policy}
	done

	for security_policy in ${NETWORK_CONFIG_DIR}/vpn/security-policies/*; do
		[ -f ${security_policy} ] || continue
		basename ${security_policy}
	done
}