Build openvpn configuration from scratch

2020-02-07 13:55:24 +00:00
parent 6a9cd7ed9c
commit 69796e1ff9
11 changed files with 204 additions and 439 deletions
--- a/internal/pia/conf.go
+++ b/internal/pia/conf.go
@@ -0,0 +1,86 @@
+package pia
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/qdm12/golibs/files"
+	"github.com/qdm12/private-internet-access-docker/internal/constants"
+	"github.com/qdm12/private-internet-access-docker/internal/models"
+)
+
+func (c *configurator) BuildConf(region models.PIARegion, protocol models.NetworkProtocol,
+	encryption models.PIAEncryption, uid, gid int) (IPs []net.IP, port uint16, err error) {
+	var X509CRL, certificate string // depends on encryption
+	var cipherAlgo, authAlgo string // depends on encryption
+	if encryption == constants.PIAEncryptionNormal {
+		cipherAlgo = "aes-128-cbc"
+		authAlgo = "sha1"
+		X509CRL = constants.PIAX509CRL_NORMAL
+		certificate = constants.PIACertificate_NORMAL
+		if protocol == constants.UDP {
+			port = 1198
+		} else {
+			port = 502
+		}
+	} else { // strong
+		cipherAlgo = "aes-256-cbc"
+		authAlgo = "sha256"
+		X509CRL = constants.PIAX509CRL_STRONG
+		certificate = constants.PIACertificate_STRONG
+		if protocol == constants.UDP {
+			port = 1197
+		} else {
+			port = 501
+		}
+	}
+	subdomain := constants.PIARegionToSubdomainMapping[region]
+	IPs, err = c.lookupIP(subdomain + ".privateinternetaccess.com")
+	if err != nil {
+		return nil, 0, err
+	}
+	lines := []string{
+		"client",
+		"dev tun",
+		"nobind",
+		"persist-key",
+		"persist-tun",
+		"tls-client",
+		"remote-cert-tls server",
+		"compress",
+		"verb 1", // TODO env variable
+		"reneg-sec 0",
+		// Added constant values
+		"mute-replay-warnings",
+		"user nonrootuser",
+		"pull-filter ignore \"auth-token\"", // prevent auth failed loops
+		"auth-retry nointeract",
+		"disable-occ",
+
+		// Modified variables
+		fmt.Sprintf("auth-user-pass %s", constants.OpenVPNAuthConf),
+		fmt.Sprintf("proto %s", string(protocol)),
+		fmt.Sprintf("cipher %s", cipherAlgo),
+		fmt.Sprintf("auth %s", authAlgo),
+	}
+	for _, IP := range IPs {
+		lines = append(lines, fmt.Sprintf("remote %s %d", IP.String(), port))
+	}
+	lines = append(lines, []string{
+		"<crl-verify>",
+		"-----BEGIN X509 CRL-----",
+		X509CRL,
+		"-----END X509 CRL-----",
+		"</crl-verify>",
+	}...)
+	lines = append(lines, []string{
+		"<ca>",
+		"-----BEGIN CERTIFICATE-----",
+		certificate,
+		"-----END CERTIFICATE-----",
+		"</ca>",
+		"",
+	}...)
+	err = c.fileManager.WriteLinesToFile(string(constants.OpenVPNConf), lines, files.FileOwnership(uid, gid), files.FilePermissions(0400))
+	return IPs, port, err
+}