Feat: Perfect privacy support (#606)

internal/provider/perfectprivacy/openvpnconf.go

@@ -0,0 +1,89 @@
+package perfectprivacy
+
+import (
+	"strconv"
+
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/provider/utils"
+)
+
+func (p *Perfectprivacy) BuildConf(connection models.Connection,
+	settings configuration.OpenVPN) (lines []string, err error) {
+	if settings.Cipher == "" {
+		// TODO add AES 256 GCM
+		settings.Cipher = constants.AES256cbc
+	}
+
+	if settings.Auth == "" {
+		settings.Auth = constants.SHA512
+	}
+
+	if settings.MSSFix == 0 {
+		settings.MSSFix = 1450
+	}
+
+	lines = []string{
+		"client",
+		"nobind",
+		"tls-exit",
+		"dev " + settings.Interface,
+		"verb " + strconv.Itoa(settings.Verbosity),
+
+		// Perfect Privacy specific
+		"ping 5",
+		"tun-mtu 1500",
+		"tun-mtu-extra 32",
+		"mssfix " + strconv.Itoa(int(settings.MSSFix)),
+		"reneg-sec 3600",
+		"key-direction 1",
+		"tls-cipher TLS_CHACHA20_POLY1305_SHA256:TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-RSA-WITH-AES-256-CBC-SHA:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-CBC-SHA:TLS_AES_256_GCM_SHA384:TLS-RSA-WITH-AES-256-CBC-SHA", //nolint:lll
+		"auth-user-pass " + constants.OpenVPNAuthConf,
+		"auth " + settings.Auth,
+
+		// Added constant values
+		"auth-nocache",
+		"mute-replay-warnings",
+		"pull-filter ignore \"auth-token\"", // prevent auth failed loops
+		"auth-retry nointeract",
+		"suppress-timestamps",
+
+		// Modified variables
+		connection.OpenVPNProtoLine(),
+		connection.OpenVPNRemoteLine(),
+	}
+
+	lines = append(lines, utils.CipherLines(settings.Cipher, settings.Version)...)
+
+	if connection.Protocol == constants.UDP {
+		lines = append(lines, "explicit-exit-notify")
+	}
+
+	if !settings.Root {
+		lines = append(lines, "user "+settings.ProcUser)
+		lines = append(lines, "persist-tun")
+		lines = append(lines, "persist-key")
+	}
+
+	if !settings.IPv6 {
+		lines = append(lines, `pull-filter ignore "route-ipv6"`)
+		lines = append(lines, `pull-filter ignore "ifconfig-ipv6"`)
+		// Perfect Privacy specific IPv6
+		lines = append(lines, "redirect-gateway def1")
+		lines = append(lines, `pull-filter ignore "redirect-gateway def1 ipv6"`)
+	}
+
+	lines = append(lines, utils.WrapOpenvpnCA(
+		constants.PerfectprivacyCA)...)
+	lines = append(lines, utils.WrapOpenvpnCert(
+		constants.PerfectprivacyCert)...)
+	lines = append(lines, utils.WrapOpenvpnKey(
+		constants.PerfectprivacyPrivateKey)...)
+	lines = append(lines, utils.WrapOpenvpnTLSCrypt(
+		constants.PerfectprivacyTLSCryptOpenvpnStaticKeyV1)...)
+
+	lines = append(lines, "")
+
+	return lines, nil
+}