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create deterministic wg interface names for vyatta

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Callan Bryant 2020-10-30 13:02:46 +00:00
parent c8c27e8ce0
commit d042250c1a
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1 changed files with 27 additions and 12 deletions
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39
add.go
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@ -42,33 +42,33 @@ AllowedIPs={{ . }}
// TODO use random wg0-wg999 to hopefully avoid conflict by default?
const vyattaPeerConf = `configure
{{ if gt (.DsnetConfig.Network.IPNet.IP | len) 0 -}}
set interfaces wireguard wg0 address {{ .Peer.IP }}/{{ .CidrSize }}
set interfaces wireguard {{ .Wgif }} address {{ .Peer.IP }}/{{ .CidrSize }}
{{ end -}}
{{ if gt (.DsnetConfig.Network6.IPNet.IP | len) 0 -}}
set interfaces wireguard wg0 address {{ .Peer.IP6 }}/{{ .CidrSize6 }}
set interfaces wireguard {{ .Wgif }} address {{ .Peer.IP6 }}/{{ .CidrSize6 }}
{{ end -}}
set interfaces wireguard wg0 route-allowed-ips true
set interfaces wireguard wg0 private-key {{ .Peer.PrivateKey.Key }}
set interfaces wireguard wg0 description {{ .DsnetConfig.InterfaceName }}
set interfaces wireguard {{ .Wgif }} route-allowed-ips true
set interfaces wireguard {{ .Wgif }} private-key {{ .Peer.PrivateKey.Key }}
set interfaces wireguard {{ .Wgif }} description {{ .DsnetConfig.InterfaceName }}
{{- if .DsnetConfig.DNS }}
#set service dns forwarding name-server {{ .DsnetConfig.DNS }}
{{ end }}
{{ if gt (.DsnetConfig.ExternalIP | len) 0 -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} endpoint {{ .DsnetConfig.ExternalIP }}:{{ .DsnetConfig.ListenPort }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} endpoint {{ .DsnetConfig.ExternalIP }}:{{ .DsnetConfig.ListenPort }}
{{ else -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} endpoint {{ .DsnetConfig.ExternalIP6 }}:{{ .DsnetConfig.ListenPort }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} endpoint {{ .DsnetConfig.ExternalIP6 }}:{{ .DsnetConfig.ListenPort }}
{{ end -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} persistent-keepalive {{ .Keepalive }}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} preshared-key {{ .Peer.PresharedKey.Key }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} persistent-keepalive {{ .Keepalive }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} preshared-key {{ .Peer.PresharedKey.Key }}
{{ if gt (.DsnetConfig.Network.IPNet.IP | len) 0 -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ .DsnetConfig.Network }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ .DsnetConfig.Network }}
{{ end -}}
{{ if gt (.DsnetConfig.Network6.IPNet.IP | len) 0 -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ .DsnetConfig.Network6 }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ .DsnetConfig.Network6 }}
{{ end -}}
{{ range .DsnetConfig.Networks -}}
set interfaces wireguard wg0 peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ . }}
set interfaces wireguard {{ .Wgif }} peer {{ .DsnetConfig.PrivateKey.PublicKey.Key }} allowed-ips {{ . }}
{{ end -}}
commit; save
`
@ -141,6 +141,17 @@ func PrintPeerCfg(peer PeerConfig, conf *DsnetConfig) {
cidrSize, _ := conf.Network.IPNet.Mask.Size()
cidrSize6, _ := conf.Network6.IPNet.Mask.Size()
// derive deterministic interface name
wgifSeed := 0
for _, b := range conf.IP {
wgifSeed += int(b)
}
for _, b := range conf.IP6 {
wgifSeed += int(b)
}
t := template.Must(template.New("peerConf").Parse(peerConf))
err := t.Execute(os.Stdout, map[string]interface{}{
"Peer": peer,
@ -148,6 +159,10 @@ func PrintPeerCfg(peer PeerConfig, conf *DsnetConfig) {
"Keepalive": time.Duration(KEEPALIVE).Seconds(),
"CidrSize": cidrSize,
"CidrSize6": cidrSize6,
// vyatta requires an interface in range/format wg0-wg999
// deterministically choosing one in this range will probably allow use
// of the config without a colliding interface name
"Wgif": fmt.Sprintf("wg%d", wgifSeed % 999),
})
check(err)
}