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255 lines
12 KiB
ReStructuredText
255 lines
12 KiB
ReStructuredText
.. _vpn-openconnect:
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###########
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OpenConnect
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###########
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OpenConnect-compatible server feature is available from this release.
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Openconnect VPN supports SSL connection and offers full network access. SSL VPN
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network extension connects the end-user system to the corporate network with
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access controls based only on network layer information, such as destination IP
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address and port number. So, it provides safe communication for all types of
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device traffic across public networks and private networks, also encrypts the
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traffic with SSL protocol.
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The remote user will use the openconnect client to connect to the router and
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will receive an IP address from a VPN pool, allowing full access to the
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network.
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*************
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Configuration
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*************
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SSL Certificates
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================
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We need to generate the certificate which authenticates users who attempt to
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access the network resource through the SSL VPN tunnels. The following commands
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will create a self signed certificates and will be stored in configuration:
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.. code-block:: none
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run generate pki ca install <CA name>
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run generate pki certificate sign <CA name> install <Server name>
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We can also create the certificates using Cerbort which is an easy-to-use
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client that fetches a certificate from Let's Encrypt an open certificate
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authority launched by the EFF, Mozilla, and others and deploys it to a web
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server.
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.. code-block:: none
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sudo certbot certonly --standalone --preferred-challenges http -d <domain name>
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Server Configuration
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====================
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.. code-block:: none
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set vpn openconnect authentication local-users username <user> password <pass>
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set vpn openconnect authentication mode <local password|radius>
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set vpn openconnect network-settings client-ip-settings subnet <subnet>
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set vpn openconnect network-settings name-server <address>
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set vpn openconnect network-settings name-server <address>
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set vpn openconnect ssl ca-certificate <pki-ca-name>
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set vpn openconnect ssl certificate <pki-cert-name>
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set vpn openconnect ssl passphrase <pki-password>
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2FA OTP support
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====================
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Instead of password only authentication, 2FA password
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authentication + OTP key can be used. Alternatively, OTP authentication only,
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without a password, can be used.
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To do this, an OTP configuration must be added to the configuration above:
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.. code-block:: none
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set vpn openconnect authentication mode local <password-otp|otp>
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set vpn openconnect authentication local-users username <user> otp <key>
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set vpn openconnect authentication local-users username <user> interval <interval (optional)>
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set vpn openconnect authentication local-users username <user> otp-length <otp-length (optional)>
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set vpn openconnect authentication local-users username <user> token-type <token-type (optional)>
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For generating an OTP key in VyOS, you can use the CLI command
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(operational mode):
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.. code-block:: none
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generate openconnect username <user> otp-key hotp-time
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************
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Verification
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************
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.. code-block:: none
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vyos@vyos:~$ sh openconnect-server sessions
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interface username ip remote IP RX TX state uptime
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----------- ---------- ------------- ----------- ------- --------- --------- --------
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sslvpn0 tst 172.20.20.198 192.168.6.1 0 bytes 152 bytes connected 3s
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.. note:: It is compatible with Cisco (R) AnyConnect (R) clients.
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*******
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Example
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*******
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SSL Certificates generation
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===========================
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Follow the instructions to generate CA cert (in configuration mode):
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.. code-block:: none
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vyos@vyos# run generate pki ca install ca-ocserv
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Enter private key type: [rsa, dsa, ec] (Default: rsa)
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Enter private key bits: (Default: 2048)
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Enter country code: (Default: GB) US
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Enter state: (Default: Some-State) Delaware
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Enter locality: (Default: Some-City) Mycity
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Enter organization name: (Default: VyOS) MyORG
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Enter common name: (Default: vyos.io) oc-ca
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Enter how many days certificate will be valid: (Default: 1825) 3650
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Note: If you plan to use the generated key on this router, do not encrypt the private key.
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Do you want to encrypt the private key with a passphrase? [y/N] N
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2 value(s) installed. Use "compare" to see the pending changes, and "commit" to apply.
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[edit]
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Follow the instructions to generate server cert (in configuration mode):
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.. code-block:: none
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vyos@vyos# run generate pki certificate sign ca-ocserv install srv-ocserv
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Do you already have a certificate request? [y/N] N
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Enter private key type: [rsa, dsa, ec] (Default: rsa)
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Enter private key bits: (Default: 2048)
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Enter country code: (Default: GB) US
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Enter state: (Default: Some-State) Delaware
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Enter locality: (Default: Some-City) Mycity
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Enter organization name: (Default: VyOS) MyORG
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Enter common name: (Default: vyos.io) oc-srv
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Do you want to configure Subject Alternative Names? [y/N] N
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Enter how many days certificate will be valid: (Default: 365) 1830
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Enter certificate type: (client, server) (Default: server)
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Note: If you plan to use the generated key on this router, do not encrypt the private key.
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Do you want to encrypt the private key with a passphrase? [y/N] N
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2 value(s) installed. Use "compare" to see the pending changes, and "commit" to apply.
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[edit]
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Each of the install command should be applied to the configuration and commited
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before using under the openconnect configuration:
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.. code-block:: none
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vyos@vyos# commit
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[edit]
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vyos@vyos# save
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Saving configuration to '/config/config.boot'...
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Done
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[edit]
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Openconnect Configuration
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=========================
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Simple setup with one user added and password authentication:
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.. code-block:: none
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set vpn openconnect authentication local-users username tst password 'OC_bad_Secret'
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set vpn openconnect authentication mode local password
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set vpn openconnect network-settings client-ip-settings subnet '172.20.20.0/24'
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set vpn openconnect network-settings name-server '10.1.1.1'
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set vpn openconnect network-settings name-server '10.1.1.2'
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set vpn openconnect ssl ca-certificate 'ca-ocserv'
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set vpn openconnect ssl certificate 'srv-ocserv'
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Adding a 2FA with an OTP-key
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============================
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First the OTP keys must be generated and sent to the user and to the
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configuration:
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.. code-block:: none
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vyos@vyos:~$ generate openconnect username tst otp-key hotp-time
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# You can share it with the user, he just needs to scan the QR in his OTP app
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# username: tst
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# OTP KEY: 5PA4SGYTQSGOBO3H3EQSSNCUNZAYAPH2
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# OTP URL: otpauth://totp/tst@vyos?secret=5PA4SGYTQSGOBO3H3EQSSNCUNZAYAPH2&digits=6&period=30
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█████████████████████████████████████████
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█████████████████████████████████████████
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████ ▄▄▄▄▄ █▀ ██▄▀ ▄█▄▀▀▄▄▄▄██ ▄▄▄▄▄ ████
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████ █ █ █▀ █▄▄▀▀▀▄█ ▄▄▀▄ █ █ █ ████
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████ █▄▄▄█ █▀█▀▄▄▀ ▄▀ █▀ ▀▄██ █▄▄▄█ ████
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████▄▄▄▄▄▄▄█▄█▄▀ ▀▄█ ▀ ▀ ▀ █▄█▄▄▄▄▄▄▄████
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████ ▄▄▄▀▄▄ ▄███▀▄▀█▄██▀ ▀▄ ▀▄█ ▀ ▀████
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████ ▀▀ ▀ ▄█▄ ▀ ▀▄ ▄█▀ ▄█ ▄▀▀▄██ █████
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████▄ █▄▀▀▄█▀ ▀█▄█▄▄▄▄ ▄▀█▀▀█ ▀ ▄ ▀█▀████
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█████ ▀█▀▄▄ █ ▀▄▄ ▄█▄ ▀█▀▀ █▀ ▄█████
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████▀██▀█▄▄ ▀▀▀▀█▄▀ ▀█▄▄▀▀▀ ▀ ▀█▄██▀▀████
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████▄ ▄ ▄▀▄██▀█ ▄ ▀▄██ ▄▄ ▀▀▄█▄██ ▄█████
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████▀▀ ▄▀ ▄ ▀█▀█▀█ █▀█▄▄▀█▀█▄██▄▄█ ▀████
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████ █ ▀█▄▄█▄ ▀ ▄▄▀▀ ▀ █▄█▀████ █▀ ▀████
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████▄██▄██▄█▀ ▄▀ ▄▄▀▄ ▄▀█ ▄ ▄▄▄ ▀█▄ ████
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████ ▄▄▄▄▄ █▄ ▀█▄█ ▄ ▀ ▄ ▄ █▄█ ▄▀▄█████
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████ █ █ █ ▀▄██▄▄▀█▄▀▄██▄▀ ▄ ▀██▀████
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████ █▄▄▄█ █ ██▀▄▄ ▀▄▄▀█▀ ▀█ ▄▀█ ▀██████
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████▄▄▄▄▄▄▄█▄███▄███▄█▄▄▄▄█▄▄█▄██▄█▄█████
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█████████████████████████████████████████
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█████████████████████████████████████████
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# To add this OTP key to configuration, run the following commands:
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set vpn openconnect authentication local-users username tst otp key 'ebc1c91b13848ce0bb67d9212934546e41803cfa'
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Next it is necessary to configure 2FA for OpenConnect:
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.. code-block:: none
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set vpn openconnect authentication mode local password-otp
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set vpn openconnect authentication local-users username tst otp key 'ebc1c91b13848ce0bb67d9212934546e41803cfa'
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Now when connecting the user will first be asked for the password
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and then the OTP key.
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.. warning:: When using Time-based one-time password (TOTP) (OTP HOTP-time),
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be sure that the time on the server and the
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OTP token generator are synchronized by NTP
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To display the configured OTP user settings, use the command:
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.. code-block:: none
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show openconnect-server user <username> otp <full|key-b32|key-hex|qrcode|uri>
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Configuring RADIUS accounting
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===========================
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OpenConnect can be configured to send accounting information to a
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RADIUS server to capture user session data such as time of
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connect/disconnect, data transferred, and so on.
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Configure an accounting server and enable accounting with:
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.. code-block:: none
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set vpn openconnect accounting mode radius
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set vpn openconnect accounting radius server 172.20.20.10
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set vpn openconnect accounting radius server 172.20.20.10 port 1813
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set vpn openconnect accounting radius server 172.20.20.10 key your_radius_secret
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.. warning:: The RADIUS accounting feature must be used with the OpenConnect
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authentication mode RADIUS. It cannot be used with local authentication.
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You must configure the OpenConnect authentication mode to "radius".
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An example of the data captured by a FREERADIUS server with sql accounting:
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.. code-block:: none
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mysql> SELECT username, nasipaddress, acctstarttime, acctstoptime, acctinputoctets, acctoutputoctets, callingstationid, framedipaddress, connectinfo_start FROM radacct;
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+----------+---------------+---------------------+---------------------+-----------------+------------------+-------------------+-----------------+-----------------------------------+
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| username | nasipaddress | acctstarttime | acctstoptime | acctinputoctets | acctoutputoctets | callingstationid | framedipaddress | connectinfo_start |
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+----------+---------------+---------------------+---------------------+-----------------+------------------+-------------------+-----------------+-----------------------------------+
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| test | 198.51.100.15 | 2023-01-13 00:59:15 | 2023-01-13 00:59:21 | 10606 | 152 | 192.168.6.1 | 172.20.20.198 | Open AnyConnect VPN Agent v8.05-1 |
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+----------+---------------+---------------------+---------------------+-----------------+------------------+-------------------+-----------------+-----------------------------------+
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