You can secure communication between the up.time monitoring station and the up.time Linux agent by enabling SSL encryption. Enabling SSL is a two-step process:
To enable SSL encryption, complete the following steps on each agent system:
Do not perform these steps on the monitoring station. |
Ensure Stunnel is installed on the agent server. If you do not have access to a distribution, you can download it from Stunnel.org.
Edit the /etc/xinetd.d/uptmagnt file so that it includes the following configuration information:
service uptmagnt { disable = no flags = REUSE socket_type = stream wait = no user = nobody server = /usr/sbin/stunnel server_args = /etc/stunnel/uptmagnt.conf } |
Create the certificate that will be used by Stunnel. For example:
openssl req -new -x509 -days 365 -nodes -config stunnel.cnf -out stunnel.pem -keyout stunnel.pem |
The following is a sample stunnel.cnf for the openssl program:
# create RSA certs - Server RANDFILE = stunnel.rnd [ req ] default_bits = 1024 encrypt_key = yes distinguished_name = req_dn x509_extensions = cert_type [ req_dn ] countryName = Country Name (2 letter code) countryName_default = PL countryName_min = 2 countryName_max = 2 stateOrProvinceName = State or Province Name (full name) stateOrProvinceName_default = Some-State localityName = Locality Name (eg, city) 0.organizationName = Organization Name (eg, company) 0.organizationName_default = Stunnel Developers Ltd organizationalUnitName = Organizational Unit Name (eg, section) #organizationalUnitName_default = 0.commonName = Common Name (FQDN of your server) 0.commonName_default = localhost # To create a certificate for more than one name uncomment: # 1.commonName = DNS alias of your server # 2.commonName = DNS alias of your server # ... # See http://home.netscape.com/eng/security/ssl_2.0_certificate.html # to see how Netscape understands commonName. [ cert_type ] nsCertType = server |
Copy stunnel.pem to /etc/stunnel/uptmagnt.pem.
Create the /etc/stunnel/uptmagnt.conf file and add the following lines:
cert=/etc/stunnel/uptmagnt.pem exec=/opt/uptime-agent/bin/uptmagnt |
Restart the xinetd service. After doing this, your agent should now be in SSL mode.
You can verify that your agent is communicating securely by running the following command on your monitoring station:
agentcmd +s -p 9998 <hostname> df-k |
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Enabling SSL in the up.time UI
If the Linux agent has already been added to up.time, complete the following steps in the up.time Web interface for each agent system that you want to configure to use SSL.
If you have not yet added the agent system to up.time, follow the steps that are detailed in the up.time User Guide. When adding the agent system, ensure that the Agent Port Number option is set to 9998, and that the Use SSL (HTTPS) option is enabled.