278 lines
8.9 KiB
Bash
278 lines
8.9 KiB
Bash
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# Shared, non-executable helpers for the CN service-host firewall scripts.
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# Configuration is parsed as data. It is never sourced by a shell.
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cn_firewall_fail() {
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echo "CN firewall: $*" >&2
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return 1
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}
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cn_firewall_validate_ipv4() {
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cn_fw_address=$1
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case $cn_fw_address in
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''|*[!0-9.]*)
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cn_firewall_fail "IPv4 values must use canonical dotted-decimal notation"
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return 1
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;;
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esac
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cn_fw_old_ifs=$IFS
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IFS=.
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set -- $cn_fw_address
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IFS=$cn_fw_old_ifs
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if [ "$#" -ne 4 ]; then
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cn_firewall_fail "IPv4 values must contain exactly four octets"
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return 1
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fi
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for cn_fw_octet in "$@"; do
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case $cn_fw_octet in
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''|*[!0-9]*)
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cn_firewall_fail "IPv4 octets must be decimal integers"
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return 1
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;;
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0) ;;
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0*)
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cn_firewall_fail "IPv4 octets must not contain leading zeroes"
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return 1
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;;
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esac
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if [ "${#cn_fw_octet}" -gt 3 ]; then
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cn_firewall_fail "IPv4 octets must contain at most three digits"
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return 1
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fi
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if [ "$cn_fw_octet" -gt 255 ]; then
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cn_firewall_fail "IPv4 octets must be in the range 0 through 255"
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return 1
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fi
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done
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cn_fw_canonical_address=$1.$2.$3.$4
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if [ "$cn_fw_address" != "$cn_fw_canonical_address" ]; then
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cn_firewall_fail "IPv4 value is not canonical dotted-decimal"
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return 1
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fi
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case $cn_fw_address in
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0.0.0.0|255.255.255.255)
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cn_firewall_fail "unspecified and limited-broadcast IPv4 values are forbidden"
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return 1
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;;
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esac
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}
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cn_firewall_validate_interface() {
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cn_fw_interface=$1
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case $cn_fw_interface in
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[A-Za-z0-9]*) ;;
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*)
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cn_firewall_fail "ingress interface must start with an ASCII alphanumeric"
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return 1
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;;
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esac
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case $cn_fw_interface in
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*[!A-Za-z0-9_.:-]*)
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cn_firewall_fail "ingress interface contains a forbidden character"
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return 1
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;;
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esac
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if [ "${#cn_fw_interface}" -gt 15 ]; then
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cn_firewall_fail "ingress interface exceeds Linux IFNAMSIZ"
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return 1
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fi
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}
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cn_firewall_mode_is_directory_safe() {
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cn_fw_mode=$1
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case $cn_fw_mode in
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[0-7][0-7][0-7]) ;;
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*) return 1 ;;
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esac
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cn_fw_group_digit=${cn_fw_mode#?}
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cn_fw_group_digit=${cn_fw_group_digit%?}
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cn_fw_other_digit=${cn_fw_mode#??}
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case $cn_fw_group_digit$cn_fw_other_digit in
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*[2367]*) return 1 ;;
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esac
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}
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cn_firewall_require_secure_parent_directories() {
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cn_fw_secure_path=$1
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cn_fw_parent=$(dirname -- "$cn_fw_secure_path")
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while [ "$cn_fw_parent" != / ]; do
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if [ ! -d "$cn_fw_parent" ] || [ -L "$cn_fw_parent" ] ||
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[ "$(stat -c '%u' -- "$cn_fw_parent")" -ne 0 ] ||
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[ "$(stat -c '%g' -- "$cn_fw_parent")" -ne 0 ] ||
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! cn_firewall_mode_is_directory_safe \
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"$(stat -c '%a' -- "$cn_fw_parent")"
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then
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cn_firewall_fail \
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"configuration parents must be root-owned, non-symlink, and non-writable by group/other"
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return 1
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fi
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cn_fw_parent=$(dirname -- "$cn_fw_parent")
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done
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}
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cn_firewall_require_secure_root_file() {
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cn_fw_secure_file=$1
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cn_fw_required_mode=$2
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case $cn_fw_secure_file in
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/*) ;;
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*)
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cn_firewall_fail "secure data path must be absolute"
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return 1
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;;
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esac
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if [ ! -f "$cn_fw_secure_file" ] || [ -L "$cn_fw_secure_file" ]; then
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cn_firewall_fail "secure data must be a regular non-symlink file"
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return 1
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fi
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if [ "$(stat -c '%u' -- "$cn_fw_secure_file")" -ne 0 ] ||
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[ "$(stat -c '%g' -- "$cn_fw_secure_file")" -ne 0 ] ||
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[ "$(stat -c '%a' -- "$cn_fw_secure_file")" != \
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"$cn_fw_required_mode" ]
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then
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cn_firewall_fail \
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"secure data must have the required root:root ownership and mode"
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return 1
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fi
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cn_firewall_require_secure_parent_directories "$cn_fw_secure_file"
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}
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cn_firewall_require_secure_config() {
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cn_fw_config=$1
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if ! cn_firewall_require_secure_root_file "$cn_fw_config" 600; then
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return 1
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fi
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}
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cn_firewall_load_config() {
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cn_fw_config=$1
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cn_fw_ownership_mode=$2
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if [ "$cn_fw_ownership_mode" = strict ]; then
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cn_firewall_require_secure_config "$cn_fw_config" || return 1
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elif [ "$cn_fw_ownership_mode" != syntax-only ]; then
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cn_firewall_fail "internal configuration-validation mode is invalid"
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return 1
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fi
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if [ ! -f "$cn_fw_config" ] || [ -L "$cn_fw_config" ]; then
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cn_firewall_fail "configuration must be a regular non-symlink file"
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return 1
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fi
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OPENPENCIL_CN_INGRESS_INTERFACE=
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OPENPENCIL_CN_GATEWAY_SOURCE_IPV4=
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OPENPENCIL_CN_SERVICE_IPV4=
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cn_fw_seen_interface=0
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cn_fw_seen_source=0
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cn_fw_seen_service=0
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cn_fw_line_number=0
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while IFS= read -r cn_fw_line || [ -n "$cn_fw_line" ]; do
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cn_fw_line_number=$((cn_fw_line_number + 1))
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case $cn_fw_line in
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''|'#'*) continue ;;
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*=*) ;;
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*)
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cn_firewall_fail \
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"invalid configuration line $cn_fw_line_number"
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return 1
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;;
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esac
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cn_fw_key=${cn_fw_line%%=*}
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cn_fw_value=${cn_fw_line#*=}
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if [ -z "$cn_fw_value" ]; then
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cn_firewall_fail \
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"empty configuration value on line $cn_fw_line_number"
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return 1
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fi
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case $cn_fw_key in
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OPENPENCIL_CN_INGRESS_INTERFACE)
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if [ "$cn_fw_seen_interface" -ne 0 ]; then
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cn_firewall_fail "duplicate ingress-interface key"
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return 1
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fi
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cn_fw_seen_interface=1
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OPENPENCIL_CN_INGRESS_INTERFACE=$cn_fw_value
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;;
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OPENPENCIL_CN_GATEWAY_SOURCE_IPV4)
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if [ "$cn_fw_seen_source" -ne 0 ]; then
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cn_firewall_fail "duplicate gateway-source key"
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return 1
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fi
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cn_fw_seen_source=1
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OPENPENCIL_CN_GATEWAY_SOURCE_IPV4=$cn_fw_value
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;;
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OPENPENCIL_CN_SERVICE_IPV4)
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if [ "$cn_fw_seen_service" -ne 0 ]; then
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cn_firewall_fail "duplicate service-address key"
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return 1
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fi
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cn_fw_seen_service=1
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OPENPENCIL_CN_SERVICE_IPV4=$cn_fw_value
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;;
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*)
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cn_firewall_fail \
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"unknown configuration key on line $cn_fw_line_number"
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return 1
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;;
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esac
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done <"$cn_fw_config"
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if [ "$cn_fw_seen_interface" -ne 1 ] ||
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[ "$cn_fw_seen_source" -ne 1 ] ||
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[ "$cn_fw_seen_service" -ne 1 ]
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then
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cn_firewall_fail "configuration must contain each required key exactly once"
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return 1
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fi
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cn_firewall_validate_interface "$OPENPENCIL_CN_INGRESS_INTERFACE" ||
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return 1
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cn_firewall_validate_ipv4 "$OPENPENCIL_CN_GATEWAY_SOURCE_IPV4" ||
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return 1
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cn_firewall_validate_ipv4 "$OPENPENCIL_CN_SERVICE_IPV4" || return 1
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if [ "$OPENPENCIL_CN_GATEWAY_SOURCE_IPV4" = \
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"$OPENPENCIL_CN_SERVICE_IPV4" ]
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then
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cn_firewall_fail "gateway source and service destination must differ"
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return 1
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fi
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}
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cn_firewall_load_deployment_binding() {
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cn_fw_binding_file=$1
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cn_firewall_require_secure_root_file "$cn_fw_binding_file" 400 || return 1
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OPENPENCIL_CN_EXPECTED_SERVICE_IPV4=
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cn_fw_binding_seen=0
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cn_fw_binding_line_number=0
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while IFS= read -r cn_fw_binding_line || [ -n "$cn_fw_binding_line" ]; do
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cn_fw_binding_line_number=$((cn_fw_binding_line_number + 1))
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case $cn_fw_binding_line in
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OPENPENCIL_CN_EXPECTED_SERVICE_IPV4=*)
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if [ "$cn_fw_binding_seen" -ne 0 ]; then
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cn_firewall_fail "duplicate deployment-binding key"
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return 1
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fi
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cn_fw_binding_seen=1
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OPENPENCIL_CN_EXPECTED_SERVICE_IPV4=${cn_fw_binding_line#*=}
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;;
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*)
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cn_firewall_fail \
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"invalid deployment-binding line $cn_fw_binding_line_number"
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return 1
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;;
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esac
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done <"$cn_fw_binding_file"
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if [ "$cn_fw_binding_seen" -ne 1 ]; then
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cn_firewall_fail "deployment binding must contain exactly one key"
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return 1
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fi
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cn_firewall_validate_ipv4 "$OPENPENCIL_CN_EXPECTED_SERVICE_IPV4" ||
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return 1
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if [ "$OPENPENCIL_CN_EXPECTED_SERVICE_IPV4" != \
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"$OPENPENCIL_CN_SERVICE_IPV4" ]
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then
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cn_firewall_fail \
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"inventory service IPv4 differs from the installed Compose binding"
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return 1
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fi
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}
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