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38 lines
2.0 KiB
Markdown
38 lines
2.0 KiB
Markdown
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# Linux strongSwan IPsec Clients (e.g., OpenWRT, Ubuntu Server, etc.)
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Install strongSwan, then copy the included ipsec_user.conf, ipsec_user.secrets, user.crt (user certificate), and user.key (private key) files to your client device. These will require customization based on your exact use case. These files were originally generated with a point-to-point OpenWRT-based VPN in mind.
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## Ubuntu Server example
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1. `sudo apt-get install strongswan libstrongswan-standard-plugins`: install strongSwan
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2. `/etc/ipsec.d/certs`: copy `<name>.crt` from `algo-master/configs/<server_ip>/ipsec/manual/<name>.crt`
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3. `/etc/ipsec.d/private`: copy `<name>.key` from `algo-master/configs/<server_ip>/ipsec/manual/<name>.key`
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4. `/etc/ipsec.d/cacerts`: copy `cacert.pem` from `algo-master/configs/<server_ip>/ipsec/manual/cacert.pem`
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5. `/etc/ipsec.secrets`: add your `user.key` to the list, e.g. `<server_ip> : ECDSA <name>.key`
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6. `/etc/ipsec.conf`: add the connection from `ipsec_user.conf` and ensure `leftcert` matches the `<name>.crt` filename
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7. `sudo ipsec restart`: pick up config changes
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8. `sudo ipsec up <conn-name>`: start the ipsec tunnel
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9. `sudo ipsec down <conn-name>`: shutdown the ipsec tunnel
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One common use case is to let your server access your local LAN without going through the VPN. Set up a passthrough connection by adding the following to `/etc/ipsec.conf`:
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conn lan-passthrough
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leftsubnet=192.168.1.1/24 # Replace with your LAN subnet
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rightsubnet=192.168.1.1/24 # Replace with your LAN subnet
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authby=never # No authentication necessary
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type=pass # passthrough
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auto=route # no need to ipsec up lan-passthrough
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To configure the connection to come up at boot time replace `auto=add` with `auto=start`.
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## Notes on SELinux
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If you use a system with SELinux enabled you might need to set appropriate file contexts:
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````
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semanage fcontext -a -t ipsec_key_file_t "$(pwd)(/.*)?"
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restorecon -R -v $(pwd)
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````
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See [this comment](https://github.com/trailofbits/algo/issues/263#issuecomment-328053950).
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