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VPNCRT

Utility for creating a 3 level certificate PKI for OpenVPN.

Central certificates (first level) grants permissions to user certificates (second level) which can grant permission for their devices (third level) to connect to OpenVPN server.

Usage

Create central certificate

./vpncrt create '#CA'

Create Diffie-Hellman parameters file

./vpncrt create '#DH'

Create OpenVPN secret key

openvpn --genkey --secret static.key
./vpncrt import < static.key

Create user certificate

# on user machine:
./vpncrt request username > request.pem

# on CA machine
./vpncrt sign < request.pem
./vpncrt export '#CA' '#TA' username > user-chain.pem

# on user machine
./vpncrt import < user-chain.pem

Create device certificate and OpenVPN client configuration file

  • Generate private key for device on user machine (not good).
# on user machine
./vpncrt create username@device
./vpncrt export username@device:ovpn > myvpn.conf
  • Generate private key for device on that device (good).
# on device
./vpncrt request username@device > request.pem

# on user machine
./vpncrt sign < request.pem
./vpncrt export '#CA' '#TA' username username@device > device-chain.pem

# on device
./vpncrt import < device-chain.pem
./vpncrt export username@device:ovpn > myvpn.conf

Create server certificate and configuration file

User certificate is not required for server. Server certificate is on the second layer

# on server machine
./vpncrt request admin@vpn-server > request.pem

# on CA machine
VPNCRT_SERVER=1 ./vpncrt sign < request.pem
./vpncrt export '#CA' '#TA' admin@vpn-server > server-chain.pem

# on server machine
./vpncrt import < server-chain.pem
# (DH parameters should be created)
./create-server.sh admin@vpn-server > myvpn-server.conf

Revoke certificates

  • Revoke device certificate (can be done by CA or by responsible user)
./vpncrt revoke username@device
  • Revoke user certificate (can be made by CA only)
./vpncrt revoke username
  • Prepare certificate revokation lists. These lists should be merged by CA to single one that will be used by OpenVPN.
./vpncrt make-crl > crl.pem

Print local certificate database status

./vpncrt print