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openvpn: now check that openvpn has been restarted since last certificates renewal
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pull/151/head
Jérémy Dubois 1 year ago
parent ebfa8df6bc
commit f3c443d076
2 changed files with 127 additions and 62 deletions
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1
CHANGELOG.md
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@ -15,6 +15,7 @@ The **patch** part changes is incremented if multiple releases happen the same m
* Explicit permissions for systemd overrides
* evolinux-base: option to bypass raid-related tasks
* kvm-host: add missing default value
* openvpn: now check that openvpn has been restarted since last certificates renewal
### Changed

188
openvpn/files/check_openvpn_certificates.sh
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@ -16,13 +16,22 @@ CA_ECHO=""
error() {
if [ $? -eq 2 ] && [ "X$CERT_ECHO" = "X" ] && [ "X$CA_ECHO" = "X" ] ; then
echo "CRITICAL - The check exited with an error. Is the conf_file var containing the real conf file location ? On Debian, is the check executed with sudo ?"
echo "CRITICAL - The check exited with an error. Is the conf_file var containing the real conf file location ? On Debian, is the check executed with sudo ? On OpenBSD, is the check executed with doas ? Is OpenVPN running ?"
fi
}
SYSTEM=$(uname | tr '[:upper:]' '[:lower:]')
date_cmd=$(command -v date)
# Some backup servers don't have OpenVPN running while they are backup
is_backup_not_running_openvpn="1"
if [ "$SYSTEM" = "openbsd" ]; then
carp=$(/sbin/ifconfig carp0 2>/dev/null | grep 'status' | cut -d' ' -f2)
if [ "$carp" = "backup" ] && ! rcctl ls on | grep -q openvpn; then
is_backup_not_running_openvpn="0"
fi
fi
# Dates in seconds
_15_days="1296000"
_30_days="2592000"
@ -30,7 +39,7 @@ current_date=$($date_cmd +"%s")
# Trying to define the OpenVPN conf file location - default to /etc/openvpn/server.conf
conf_file=$(ps auwwwx | grep openvpn | grep -- --config | grep -v sed | sed -e "s/.*config \(\/etc\/openvpn.*.conf\).*/\1/" | head -1)
[ "$SYSTEM" = "openbsd" ] && conf_file=${conf_file:-$(grep openvpn_flags /etc/rc.conf.local | sed -e "s/.*config \(\/etc\/openvpn.*.conf\).*/\1/")}
if [ "$SYSTEM" = "openbsd" ]; then conf_file=${conf_file:-$(grep openvpn_flags /etc/rc.conf.local | sed -e "s/.*config \(\/etc\/openvpn.*.conf\).*/\1/")}; fi
conf_file=${conf_file:-"/etc/openvpn/server.conf"}
# Get the cert and ca file location, based on the OpenVPN conf file location
@ -44,22 +53,34 @@ ca_file=$(echo $ca_file | sed -e "s/^ca *\//\//")
cert_expiration_date=$(grep "Not After" $cert_file | sed -e "s/.*Not After : //")
ca_expiration_date=$(openssl x509 -enddate -noout -in $ca_file | cut -d '=' -f 2)
# Get the date of last modification of cert and ca certificates
if [ "$SYSTEM" = "openbsd" ]; then
seconds_last_cert_modification_date=$(stat -f %m "$cert_file")
seconds_last_ca_modification_date=$(stat -f %m "$ca_file")
else
seconds_last_cert_modification_date=$(stat -c %Y "$cert_file")
seconds_last_ca_modification_date=$(stat -c %Y "$ca_file")
fi
# Get the date of last OpenVPN restart
last_openvpn_restart_date=$(ps awwwx -O lstart | grep openvpn | grep -vE "grep|check_openvpn_certificates.sh" | awk '{print $3,$4,$5,$6}')
test_cert_expiration() {
# Already expired - Cert file
if [ $current_date -ge $1 ]; then
CERT_ECHO="CRITICAL - The server certificate has expired on $formatted_cert_expiration_date"
CERT_ECHO="CRITICAL - The server certificate has expired on $formated_cert_expiration_date"
CERT_STATE=$STATE_CRITICAL
# Expiration in 15 days or less - Cert file
elif [ $((current_date+_15_days)) -ge $1 ]; then
CERT_ECHO="CRITICAL - The server certificate expires in 15 days or less : $formatted_cert_expiration_date"
CERT_ECHO="CRITICAL - The server certificate expires in 15 days or less : $formated_cert_expiration_date"
CERT_STATE=$STATE_CRITICAL
# Expiration in 30 days or less - Cert file
elif [ $((current_date+_30_days)) -ge $1 ]; then
CERT_ECHO="WARNING - The server certificate expires in 30 days or less : $formatted_cert_expiration_date"
CERT_ECHO="WARNING - The server certificate expires in 30 days or less : $formated_cert_expiration_date"
CERT_STATE=$STATE_WARNING
# Expiration in more than 30 days - Cert file
else
CERT_ECHO="OK - The server certificate expires on $formatted_cert_expiration_date"
CERT_ECHO="OK - The server certificate expires on $formated_cert_expiration_date"
CERT_STATE=$STATE_OK
fi
}
@ -67,74 +88,117 @@ test_cert_expiration() {
test_ca_expiration() {
# Already expired - CA file
if [ $current_date -ge $1 ]; then
CA_ECHO="CRITICAL - The server CA has expired on $formatted_ca_expiration_date"
CA_ECHO="CRITICAL - The server CA has expired on $formated_ca_expiration_date"
CA_STATE=$STATE_CRITICAL
# Expiration in 15 days or less - CA file
elif [ $((current_date+_15_days)) -ge $1 ]; then
CA_ECHO="CRITICAL - The server CA expires in 15 days or less : $formatted_ca_expiration_date"
CA_ECHO="CRITICAL - The server CA expires in 15 days or less : $formated_ca_expiration_date"
CA_STATE=$STATE_CRITICAL
# Expiration in 30 days or less - CA file
elif [ $((current_date+_30_days)) -ge $1 ]; then
CA_ECHO="WARNING - The server CA expires in 30 days or less : $formatted_ca_expiration_date"
CA_ECHO="WARNING - The server CA expires in 30 days or less : $formated_ca_expiration_date"
CA_STATE=$STATE_WARNING
# Expiration in more than 30 days - CA file
else
CA_ECHO="OK - The server CA expires on $formatted_ca_expiration_date"
CA_ECHO="OK - The server CA expires on $formated_ca_expiration_date"
CA_STATE=$STATE_OK
fi
}
# Linux and BSD systems do not implement 'date' the same way
if [ "$SYSTEM" = "linux" ]; then
# Cert expiration date human formated then in seconds
formatted_cert_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$cert_expiration_date" +"%F %T %Z")
seconds_cert_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$cert_expiration_date" +"%s")
# CA expiration date human formated then in seconds
formatted_ca_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$ca_expiration_date" +"%F %T %Z")
seconds_ca_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$ca_expiration_date" +"%s")
test_cert_expiration $seconds_cert_expiration_date
test_ca_expiration $seconds_ca_expiration_date
elif [ "$SYSTEM" = "openbsd" ]; then
# Cert expiration date for POSIX date, human formated then in seconds
posix_cert_expiration_date=$(echo "$cert_expiration_date" | awk '{ printf $4" "(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3" "$2" ",split($3,time,":"); print time[1],time[2],time[3]}' | awk '{printf "%04d%02d%02d%02d%02d.%02d\n", $1, $2, $3, $4, $5, $6}')
cert_zone=$(echo "$cert_expiration_date" | awk '{print $5}')
formatted_cert_expiration_date=$(TZ=$cert_zone $date_cmd -j -z "Europe/Paris" "$posix_cert_expiration_date" +"%F %T %Z")
seconds_cert_expiration_date=$(TZ=$cert_zone $date_cmd -j -z "Europe/Paris" "$posix_cert_expiration_date" +"%s")
# CA expiration date for POSIX date, human formated then in seconds
posix_ca_expiration_date=$(echo "$ca_expiration_date" | awk '{ printf $4" "(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3" "$2" ",split($3,time,":"); print time[1],time[2],time[3]}' | awk '{printf "%04d%02d%02d%02d%02d.%02d\n", $1, $2, $3, $4, $5, $6}')
ca_zone=$(echo "$ca_expiration_date" | awk '{print $5}')
formatted_ca_expiration_date=$(TZ=$ca_zone $date_cmd -j -z "Europe/Paris" "$posix_ca_expiration_date" +"%F %T %Z")
seconds_ca_expiration_date=$(TZ=$ca_zone $date_cmd -j -z "Europe/Paris" "$posix_ca_expiration_date" +"%s")
test_cert_expiration $seconds_cert_expiration_date
test_ca_expiration $seconds_ca_expiration_date
# If neither Linux nor BSD
else
echo "CRITICAL - OS not supported"
STATE=$STATE_CRITICAL
exit $STATE
test_openvpn_restarted_since_last_ca_cert_modification() {
if [ $is_backup_not_running_openvpn -eq "0" ]; then
RESTART_ECHO="OK - OpenVPN is not running because server is backup"
RESTART_STATE=$STATE_OK
else
if [ $seconds_last_cert_modification_date -ge $1 ] || [ $seconds_last_ca_modification_date -ge $1 ]; then
RESTART_ECHO="CRITICAL - OpenVPN hasn't been restarted since the last renewal of CA or CERT certificate"
RESTART_STATE=$STATE_CRITICAL
else
RESTART_ECHO="OK - OpenVPN has been restarted since the last renewal of CA and CERT certificate"
RESTART_STATE=$STATE_OK
fi
fi
}
fi
main() {
# Linux and BSD systems do not implement 'date' the same way
if [ "$SYSTEM" = "linux" ]; then
# Cert expiration date human formated then in seconds
formated_cert_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$cert_expiration_date" +"%F %T %Z")
seconds_cert_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$cert_expiration_date" +"%s")
# CA expiration date human formated then in seconds
formated_ca_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$ca_expiration_date" +"%F %T %Z")
seconds_ca_expiration_date=$(TZ="Europe/Paris" $date_cmd -d "$ca_expiration_date" +"%s")
# Last OpenVPN restart in seconds
seconds_last_openvpn_restart_date=$(TZ="Europe/Paris" $date_cmd -d "$last_openvpn_restart_date" +%s)
test_cert_expiration $seconds_cert_expiration_date
test_ca_expiration $seconds_ca_expiration_date
test_openvpn_restarted_since_last_ca_cert_modification $seconds_last_openvpn_restart_date
elif [ "$SYSTEM" = "openbsd" ]; then
# Cert expiration date for POSIX date, human formated then in seconds
posix_cert_expiration_date=$(echo "$cert_expiration_date" | awk '{ printf $4" "(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3" "$2" ",split($3,time,":"); print time[1],time[2],time[3]}' | awk '{printf "%04d%02d%02d%02d%02d.%02d\n", $1, $2, $3, $4, $5, $6}')
cert_zone=$(echo "$cert_expiration_date" | awk '{print $5}')
formated_cert_expiration_date=$(TZ=$cert_zone $date_cmd -j -z "Europe/Paris" "$posix_cert_expiration_date" +"%F %T %Z")
seconds_cert_expiration_date=$(TZ=$cert_zone $date_cmd -j -z "Europe/Paris" "$posix_cert_expiration_date" +"%s")
# CA expiration date for POSIX date, human formated then in seconds
posix_ca_expiration_date=$(echo "$ca_expiration_date" | awk '{ printf $4" "(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3" "$2" ",split($3,time,":"); print time[1],time[2],time[3]}' | awk '{printf "%04d%02d%02d%02d%02d.%02d\n", $1, $2, $3, $4, $5, $6}')
ca_zone=$(echo "$ca_expiration_date" | awk '{print $5}')
formated_ca_expiration_date=$(TZ=$ca_zone $date_cmd -j -z "Europe/Paris" "$posix_ca_expiration_date" +"%F %T %Z")
seconds_ca_expiration_date=$(TZ=$ca_zone $date_cmd -j -z "Europe/Paris" "$posix_ca_expiration_date" +"%s")
test_cert_expiration $seconds_cert_expiration_date
test_ca_expiration $seconds_ca_expiration_date
if [ $is_backup_not_running_openvpn -eq "0" ]; then
test_openvpn_restarted_since_last_ca_cert_modification 0
else
# Last OpenVPN restart in POSIX format, then in seconds
posix_last_openvpn_restart_date=$(echo "$last_openvpn_restart_date" | awk '{ printf $4" "(index("JanFebMarAprMayJunJulAugSepOctNovDec",$1)+2)/3" "$2" ",split($3,time,":"); print time[1],time[2],time[3]}' | awk '{printf "%04d%02d%02d%02d%02d.%02d\n", $1, $2, $3, $4, $5, $6}')
seconds_last_openvpn_restart_date=$($date_cmd -j "$posix_last_openvpn_restart_date" +%s)
test_openvpn_restarted_since_last_ca_cert_modification $seconds_last_openvpn_restart_date
fi
# If neither Linux nor BSD
else
echo "CRITICAL - OS not supported"
STATE=$STATE_CRITICAL
exit $STATE
fi
if [ $RESTART_STATE -gt $STATE_OK ]; then
echo $RESTART_ECHO
echo $CERT_ECHO
echo $CA_ECHO
exit $RESTART_STATE
else
# Display the first one that expires first
if [ $CA_STATE -gt $CERT_STATE ]; then
echo $CA_ECHO
echo $CERT_ECHO
echo $RESTART_ECHO
exit $CA_STATE
elif [ $CERT_STATE -gt $CA_STATE ]; then
echo $CERT_ECHO
echo $CA_ECHO
echo $RESTART_ECHO
exit $CERT_STATE
else
echo $CERT_ECHO
echo $CA_ECHO
echo $RESTART_ECHO
exit $CERT_STATE
fi
fi
}
# Display the first one that expires first
if [ $CA_STATE -gt $CERT_STATE ]; then
echo $CA_ECHO
echo $CERT_ECHO
exit $CA_STATE
elif [ $CERT_STATE -gt $CA_STATE ]; then
echo $CERT_ECHO
echo $CA_ECHO
exit $CERT_STATE
else
echo $CERT_ECHO
echo $CA_ECHO
exit $CERT_STATE
fi
main

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