[3/3] zabbix_agentd: Add OpenVPN certificates items

  - Adds Zabbix Agent userparameters `ipfire.ovpn.clientcert` and `ipfire.ovpn.cacert` for the agent to get details about openvpn client, server and ca certificates.
- Moves all `ipfire.ovpn.*` userparameters to a separate config file `userparameter_ovpn.conf` to enable users to selectively disable openvpn items when not needed
- Includes `ipfire_certificate_detail.sh` script in sudoers for Zabbix Agent as it needs root permission to read openvpn certificate details.
- Adapts lfs install script to install new script and configfile
- Adds new script and configfile to rootfiles
---
 config/rootfiles/packages/zabbix_agentd        |  3 +++
 config/zabbix_agentd/sudoers                   |  1 +
 config/zabbix_agentd/userparameter_ipfire.conf |  8 +-------
 config/zabbix_agentd/userparameter_ovpn.conf   | 13 +++++++++++++
 lfs/zabbix_agentd                              |  7 +++++++
 5 files changed, 25 insertions(+), 7 deletions(-)
 create mode 100644 config/zabbix_agentd/userparameter_ovpn.conf
  

Reviewed-by: Adolf Belka <adolf.belka@ipfire.org>

On 28/02/2024 19:58, Robin Roevens wrote:
> - Adds Zabbix Agent userparameters `ipfire.ovpn.clientcert` and `ipfire.ovpn.cacert` for the agent to get details about openvpn client, server and ca certificates.
> - Moves all `ipfire.ovpn.*` userparameters to a separate config file `userparameter_ovpn.conf` to enable users to selectively disable openvpn items when not needed
> - Includes `ipfire_certificate_detail.sh` script in sudoers for Zabbix Agent as it needs root permission to read openvpn certificate details.
> - Adapts lfs install script to install new script and configfile
> - Adds new script and configfile to rootfiles
> ---
>   config/rootfiles/packages/zabbix_agentd        |  3 +++
>   config/zabbix_agentd/sudoers                   |  1 +
>   config/zabbix_agentd/userparameter_ipfire.conf |  8 +-------
>   config/zabbix_agentd/userparameter_ovpn.conf   | 13 +++++++++++++
>   lfs/zabbix_agentd                              |  7 +++++++
>   5 files changed, 25 insertions(+), 7 deletions(-)
>   create mode 100644 config/zabbix_agentd/userparameter_ovpn.conf
>
> diff --git a/config/rootfiles/packages/zabbix_agentd b/config/rootfiles/packages/zabbix_agentd
> index 729a47ac6..8e10cb4c8 100644
> --- a/config/rootfiles/packages/zabbix_agentd
> +++ b/config/rootfiles/packages/zabbix_agentd
> @@ -20,3 +20,6 @@ var/ipfire/zabbix_agentd/zabbix_agentd_ipfire_mandatory.conf
>   var/ipfire/zabbix_agentd/userparameters
>   var/ipfire/zabbix_agentd/userparameters/userparameter_pakfire.conf
>   var/ipfire/zabbix_agentd/userparameters/userparameter_ipfire.conf
> +var/ipfire/zabbix_agentd/userparameters/userparameter_ovpn.conf
> +var/ipfire/zabbix_agentd/scripts
> +var/ipfire/zabbix_agentd/scripts/ipfire_certificate_detail.sh
> diff --git a/config/zabbix_agentd/sudoers b/config/zabbix_agentd/sudoers
> index d93ec5d55..138c75635 100644
> --- a/config/zabbix_agentd/sudoers
> +++ b/config/zabbix_agentd/sudoers
> @@ -9,3 +9,4 @@
>   #
>   Defaults:zabbix !requiretty
>   zabbix ALL=(ALL) NOPASSWD: /opt/pakfire/pakfire status, /usr/sbin/fping, /usr/local/bin/getipstat, /bin/cat /var/run/ovpnserver.log
> +zabbix ALL=(ALL) NOPASSWD: /var/ipfire/zabbix_agentd/scripts/ipfire_certificate_detail.sh
> diff --git a/config/zabbix_agentd/userparameter_ipfire.conf b/config/zabbix_agentd/userparameter_ipfire.conf
> index ba0c6c2ca..d2d0c8307 100644
> --- a/config/zabbix_agentd/userparameter_ipfire.conf
> +++ b/config/zabbix_agentd/userparameter_ipfire.conf
> @@ -9,10 +9,4 @@ UserParameter=ipfire.net.fw.hits.raw,sudo /usr/local/bin/getipstat -xf | grep "/
>   # Number of currently Active DHCP leases
>   UserParameter=ipfire.dhcpd.clients,grep -s -E 'lease|bind' /var/state/dhcp/dhcpd.leases | sed ':a;/{$/{N;s/\n//;ba}' | grep "state active" | wc -l
>   # Number of Captive Portal clients
> -UserParameter=ipfire.captive.clients,awk -F ',' 'length($2) == 17 {sum += 1} END {if (length(sum) == 0) print 0; else print sum}' /var/ipfire/captive/clients
> -# Discovery of configured ovpn clients
> -UserParameter=ipfire.ovpn.clients.discovery,cat /var/ipfire/ovpn/ovpnconfig 2>/dev/null | awk -F',' 'BEGIN { ORS = ""; print "[" } { printf "%s{\"{#NAME}\":\"%s\",\"{#COMMONNAME}\":\"%s\",\"{#STATE}\":\"%s\",\"{#REMARK}\":\"%s\",\"{#TYPE}\":\"%s\"}", separator, $3, $4, $2, $27, $5; separator = ","; } END { print "]" }'
> -# Get OpenVPN status report
> -UserParameter=ipfire.ovpn.statusreport.get,sudo cat /var/run/ovpnserver.log 2>/dev/null | awk -F"," 'function unixtime(t) { gsub(/[-:]/," ",t); return mktime(t) } BEGIN { ORS = ""; print "{" } /^Updated,.+/ { printf "\"timestamp\":%s,\"clients\":[",unixtime($2) } /^.+,[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+,[0-9]+,[0-9]+,.+/ { if ($1 != "Common Name") { printf "%s{\"common_name\":\"%s\",\"real_address\":\"%s\",\"bytes_in\":\"%s\",\"bytes_out\":\"%s\",\"connected_since\":\"%s\"}", separator, $1, $2, $3, $4, unixtime($5); separator = ","; } } /^ROUTING TABLE/ { print "],\"routing_table\":["; separator = "" } /^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+,.+,[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+,.+/ { if ($1 != "Virtual Address") { printf "%s{\"common_name\":\"%s\",\"virtual_address\":\"%s\",\"real_address\":\"%s\",\"last_ref\":\"%s\"}", separator, $2, $1, $3, unixtime($4); separator = "," } } END { print "]}" }'
> -# Allow item key to be called with (unused) parameters. This allows the #SINGLETON method of discovering this item only when openvpn service is active
> -Alias=ipfire.ovpn.statusreport.get[]:ipfire.ovpn.statusreport.get
> \ No newline at end of file
> +UserParameter=ipfire.captive.clients,awk -F ',' 'length($2) == 17 {sum += 1} END {if (length(sum) == 0) print 0; else print sum}' /var/ipfire/captive/clients
> \ No newline at end of file
> diff --git a/config/zabbix_agentd/userparameter_ovpn.conf b/config/zabbix_agentd/userparameter_ovpn.conf
> new file mode 100644
> index 000000000..a7a6d8535
> --- /dev/null
> +++ b/config/zabbix_agentd/userparameter_ovpn.conf
> @@ -0,0 +1,13 @@
> +# Parameters for monitoring IPFire OpenVPN specific metrics
> +#
> +# Discovery of configured ovpn clients
> +UserParameter=ipfire.ovpn.clients.discovery,cat /var/ipfire/ovpn/ovpnconfig 2>/dev/null | awk -F',' 'BEGIN { ORS = ""; print "[" } { printf "%s{\"{#NAME}\":\"%s\",\"{#COMMONNAME}\":\"%s\",\"{#STATE}\":\"%s\",\"{#REMARK}\":\"%s\",\"{#TYPE}\":\"%s\"}", separator, $3, $4, $2, $27, $5; separator = ","; } END { print "]" }'
> +# Get OpenVPN status report
> +UserParameter=ipfire.ovpn.statusreport.get,sudo cat /var/run/ovpnserver.log 2>/dev/null | awk -F"," 'function unixtime(t) { gsub(/[-:]/," ",t); return mktime(t) } BEGIN { ORS = ""; print "{" } /^Updated,.+/ { printf "\"timestamp\":%s,\"clients\":[",unixtime($2) } /^.+,[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+,[0-9]+,[0-9]+,.+/ { if ($1 != "Common Name") { printf "%s{\"common_name\":\"%s\",\"real_address\":\"%s\",\"bytes_in\":\"%s\",\"bytes_out\":\"%s\",\"connected_since\":\"%s\"}", separator, $1, $2, $3, $4, unixtime($5); separator = ","; } } /^ROUTING TABLE/ { print "],\"routing_table\":["; separator = "" } /^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+,.+,[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+,.+/ { if ($1 != "Virtual Address") { printf "%s{\"common_name\":\"%s\",\"virtual_address\":\"%s\",\"real_address\":\"%s\",\"last_ref\":\"%s\"}", separator, $2, $1, $3, unixtime($4); separator = "," } } END { print "]}" }'
> +# Get OpenVPN client certificate details
> +UserParameter=ipfire.ovpn.clientcert[*],sudo /var/ipfire/zabbix_agentd/scripts/ipfire_certificate_detail.sh /var/ipfire/ovpn/ca/cacert.pem /var/ipfire/ovpn/certs/$1cert.pem
> +UserParameter=ipfire.ovpn.cacert,sudo /var/ipfire/zabbix_agentd/scripts/ipfire_certificate_detail.sh /var/ipfire/ovpn/ca/cacert.pem /var/ipfire/ovpn/ca/cacert.pem
> +
> +# Allow item key to be called with (unused) parameters. This allows the #SINGLETON method of discovering this item only when openvpn service is active
> +Alias=ipfire.ovpn.statusreport.get[]:ipfire.ovpn.statusreport.get
> +Alias=ipfire.ovpn.cacert[]:ipfire.ovpn.cacert
> \ No newline at end of file
> diff --git a/lfs/zabbix_agentd b/lfs/zabbix_agentd
> index 65e111d2f..5f274c309 100644
> --- a/lfs/zabbix_agentd
> +++ b/lfs/zabbix_agentd
> @@ -110,6 +110,13 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
>   		/var/ipfire/zabbix_agentd/userparameters/userparameter_pakfire.conf
>   	install -v -m 644 $(DIR_SRC)/config/zabbix_agentd/userparameter_ipfire.conf \
>   		/var/ipfire/zabbix_agentd/userparameters/userparameter_ipfire.conf
> +	install -v -m 644 $(DIR_SRC)/config/zabbix_agentd/userparameter_ovpn.conf \
> +		/var/ipfire/zabbix_agentd/userparameters/userparameter_ovpn.conf
> +
> +	# Install IPFire-specific Zabbix Agent scripts
> +	-mkdir -pv /var/ipfire/zabbix_agentd/scripts
> +	install -v -m 755 $(DIR_SRC)/config/zabbix_agentd/ipfire_certificate_detail.sh \
> +		/var/ipfire/zabbix_agentd/scripts/ipfire_certificate_detail.sh
>   
>   	# Create directory for additional agent modules
>   	-mkdir -pv /usr/lib/zabbix