luzifer/vault-openvpn
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Merge branch 'tls-auth'

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This commit is contained in:
Knut Ahlers 2018-05-27 10:30:47 +02:00
commit 6048719362
Signed by: luzifer
GPG Key ID: DC2729FDD34BE99E
2 changed files with 68 additions and 9 deletions
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41
README.md
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@ -60,8 +60,8 @@ The configurations generated by this tool will not need multiple files but inclu
After you've set up your folder (you also could use one of the example configurations in the [`example` folder](https://github.com/Luzifer/vault-openvpn/tree/master/example) of this repository) you can issue your servers configuration:
```bash
# vault-openvpn --auto-revoke --pki-mountpoint luzifer_io server edda.openvpn.luzifer.io
```console
$ vault-openvpn --auto-revoke --pki-mountpoint luzifer_io server edda.openvpn.luzifer.io
server 10.231.0.0 255.255.255.0
route 10.231.0.0 255.255.255.0
@ -70,8 +70,8 @@ route 10.231.0.0 255.255.255.0
And also you can generate client configurations:
```bash
# vault-openvpn --auto-revoke --pki-mountpoint luzifer_io client workwork01.openvpn.luzifer.io
```console
$ vault-openvpn --auto-revoke --pki-mountpoint luzifer_io client workwork01.openvpn.luzifer.io
remote myserver.com 1194 udp
[...]
@ -79,8 +79,8 @@ remote myserver.com 1194 udp
In case someone needs to get removed from your OpenVPN there is also a revoke:
```bash
# vault-openvpn --auto-revoke --pki-mountpoint luzifer_io revoke baduser.openvpn.luzifer.io
```console
$ vault-openvpn --auto-revoke --pki-mountpoint luzifer_io revoke baduser.openvpn.luzifer.io
[...]
2016/07/25 15:06:58 Found certificate 33:e1:0c:85:36:a5:c2:6b:05:85:f5:aa:9f:3b:f3:3a:a2:e0:ae:b0 with CN baduser.openvpn.luzifer.io
2016/07/25 15:06:58 Revoked certificate 33:e1:0c:85:36:a5:c2:6b:05:85:f5:aa:9f:3b:f3:3a:a2:e0:ae:b0
@ -88,3 +88,32 @@ In case someone needs to get removed from your OpenVPN there is also a revoke:
```
To have revokes being executed by OpenVPN you need to periodically update the CRL file OpenVPN reads. For my solution see the `living-example` in the `example` folder.
## Using TLS authentication
OpenVPN highly recommends using TLS authentication hardening, see [GettingStartedwithOVPN](https://community.openvpn.net/openvpn/wiki/GettingStartedwithOVPN#TLSAuthentication).
This requires the use of a pre-shared key: If you want to use it, you will first need to generate a TLS authentication key and then upload it into vault:
```console
$ openvpn --genkey --secret openvpn.key
$ vault kv put secret/ovpn key=@openvpn.key
```
In the above example we call the secret "ovpn" but you can call it anything you want, as long as it is a known value.
The key must be placed into both the client and server configurations and must match. Edit both config templates to include a section as shown below:
```
<tls-auth>
{{ .TLSAuth }}
</tls-auth>
```
Now run vault-openvpn passing in the name of the secret that holds our key, e.g.
```console
# for the server config
$ vault-openvpn --auto-revoke --ovpn-key secret/ovpn --pki-mountpoint luzifer_io server edda.openvpn.luzifer.io
# for the client config
$ vault-openvpn --auto-revoke --ovpn-key secret/ovpn --pki-mountpoint luzifer_io client workwork01.openvpn.luzifer.io
```

36
main.go
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@ -45,6 +45,7 @@ var (
AutoRevoke bool `flag:"auto-revoke" vardefault:"auto-revoke" description:"Automatically revoke older certificates for this FQDN"`
CertTTL time.Duration `flag:"ttl" vardefault:"ttl" description:"Set the TTL for this certificate"`
OVPNKey string `flag:"ovpn-key" vardefault:"ovpn-key" description:"Specify a secret name that holds an OpenVPN shared key"`
LogLevel string `flag:"log-level" vardefault:"log-level" description:"Log level to use (debug, info, warning, error)"`
Sort string `flag:"sort" vardefault:"sort" description:"How to sort list output (fqdn, issuedate, expiredate)"`
@ -53,13 +54,14 @@ var (
}{}
defaultConfig = map[string]string{
"auto-revoke": "true",
"log-level": "info",
"ovpn-key": "",
"pki-mountpoint": "/pki",
"pki-role": "openvpn",
"auto-revoke": "true",
"ttl": "8760h",
"log-level": "info",
"sort": "fqdn",
"template-path": ".",
"ttl": "8760h",
}
version = "dev"
@ -71,6 +73,7 @@ type templateVars struct {
CertAuthority string
Certificate string
PrivateKey string
TLSAuth string
}
type listCertificatesTableRow struct {
@ -290,6 +293,13 @@ func generateCertificateConfig(tplName, fqdn string) error {
tplv.CertAuthority = caCert
if cfg.OVPNKey != "" {
tplv.TLSAuth, err = fetchOVPNKey()
if err != nil {
return fmt.Errorf("Could not fetch TLSAuth key: %s", err)
}
}
if err := renderTemplate(tplName, tplv); err != nil {
return fmt.Errorf("Could not render configuration: %s", err)
}
@ -434,6 +444,26 @@ func getCACert() (string, error) {
return cs.Data["certificate"].(string), nil
}
func fetchOVPNKey() (string, error) {
path := strings.Trim(cfg.OVPNKey, "/")
secret, err := client.Logical().Read(path)
if err != nil {
return "", err
}
if secret == nil || secret.Data == nil {
return "", errors.New("Got no data from backend")
}
key, ok := secret.Data["key"]
if !ok {
return "", errors.New("Within specified secret no entry named 'key' was found")
}
return key.(string), nil
}
func generateCertificate(fqdn string) (*templateVars, error) {
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "issue", cfg.PKIRole}, "/")
secret, err := client.Logical().Write(path, map[string]interface{}{