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99 lines
3.2 KiB
Bash
Executable file
99 lines
3.2 KiB
Bash
Executable file
#!/bin/sh
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: << =cut
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=head1 NAME
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certificate_file_expiry - check the certificate validity of your certificates
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= head1 CONFIGURATION
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Installing: Add list of your certificates prefixed by the type in munin plugin-conf.d
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For openvpn ca.crt and crl.pem
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[certificate_file_expiry]
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user root
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env.CERTS crl:/etc/openvpn/easy-rsa/keys/crl.pem x509:/etc/openvpn/easy-rsa/keys/ca.crt
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env.LOGARITHMIC yes
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For letsencrypt certificates
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[certificate_file_expiry]
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user root
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env.CERTS x509:/etc/letsencrypt/live/*/cert.pem
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Warning and Critical levels can also be configured with env variables like this:
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[certificate_file_expiry]
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...
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# warn when certificate will be invalid within 5 days
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env.warning 5:
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# for this certificate warn us 10 days before because it takes longer to renew
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env._etc_letsencrypt_live_example_com_cert_pem_warning 10:
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# critical when certificate will be invalid within 1 day
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env.critical 1:
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env.CERTS should be a space separated list of patterns prefixed by the type of certificate to check and a colon. All types of
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certificates that openssl supports as standard commands and have a validity output are supported (e.g. x509, crl).
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File patterns can be a single file (e.g. /etc/openvpn/easy-rsa/keys/crl.pem) or a pattern that matches multiple files
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(e.g. /etc/letsencrypt/live/*/cert.pem).
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env.warning and env.critical are configurable values for the warning and critical levels according to
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http://guide.munin-monitoring.org/en/latest/tutorial/alert.html?highlight=warning#syntax-of-warning-and-critical
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env.LOGARITHMIC "yes" enables the logarithmic display of values which is useful if some of your certs are relatively
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long lived in respect to the warning level. e.g. a ca.crt that is valid for 10 years together with a crl.pem that is
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valid for only a few months combined with warning levels of 5 days. default is "yes" to disable set it to "no".
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=head1 Dependencies
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Dependencies: openssl
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=head1 AUTHOR
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andreas perhab - andreas.perhab@wt-io-it.at (https://www.wt-io-it.at/)
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=head1 LICENSE
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GPLv2
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=cut
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. "$MUNIN_LIBDIR/plugins/plugin.sh"
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LOGARITHMIC=${LOGARITHMIC:-yes}
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if [ "$1" = "config" ] ; then
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echo "graph_title Certificate validity"
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if [ "$LOGARITHMIC" = "yes" ] ; then
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graph_args="--logarithmic --units=si"
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fi
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echo "graph_args --base 1000 $graph_args"
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echo "graph_vlabel days"
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echo "graph_category security"
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fi
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# by default when certificate is only valid for 5 days or less emit a warning
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warning=${warning:-5:}
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# by default when certificate is only valid for 1 day or less emit a critical
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critical=${critical:-1:}
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now=$(date +%s)
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for cert in ${CERTS}; do
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cert_type=${cert%:*}
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cert_pattern=${cert#*:}
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for cert_file in $cert_pattern; do
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cert_name=$(clean_fieldname "$cert_file")
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if [ "$1" = "config" ] ; then
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echo "${cert_name}.label ${cert_file}"
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print_warning "$cert_name"
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print_critical "$cert_name"
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elif [ "$1" = "" ] ; then
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validity=$(/usr/bin/openssl "$cert_type" -text -noout -in "$cert_file" | grep -E '(Next Update|Not After)')
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validity=${validity#*:}
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validity=$(date --date="$validity" +%s)
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validity=$((validity - now))
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validity=$(echo "$validity" | awk '{ print ($1 / 86400) }')
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echo "${cert_name}.value $validity"
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fi
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done
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done
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