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pkg/mesh,pkg/wireguard: allow DNS name endpoints

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This commit allows DNS names to be used when specifying the endpoint
for a node in the WireGuard mesh. This is useful in many scenarios, in
particular when operating an IoT device whose public IP is dynamic. This
change allows the administrator to use a dynamic DNS name in the node's
endpoint.

One of the side-effects of this change is that the WireGuard port can
now be specified individually for each node in the mesh, if the
administrator wishes to do so.

*Note*: this commit introduces a breaking change; the
`force-external-ip` node annotation has been removed; its functionality
has been ported over to the `force-endpoint` annotation. This annotation
is documented in the annotations.md file. The expected content of this
annotation is no longer a CIDR but rather a host:port. The host can be
either a DNS name or an IP.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit is contained in:
Lucas Servén Marín
2020-02-22 17:17:13 +01:00
parent 223b641ee1
commit aa376ff0d1
14 changed files with 658 additions and 149 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
pkg/k8s/backend.go
View File

@@ -32,6 +32,7 @@ import (
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/validation"
v1informers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
v1listers "k8s.io/client-go/listers/core/v1"
@@ -48,8 +49,8 @@ import (
const (
// Backend is the name of this mesh backend.
Backend = "kubernetes"
externalIPAnnotationKey = "kilo.squat.ai/external-ip"
forceExternalIPAnnotationKey = "kilo.squat.ai/force-external-ip"
endpointAnnotationKey = "kilo.squat.ai/endpoint"
forceEndpointAnnotationKey = "kilo.squat.ai/force-endpoint"
forceInternalIPAnnotationKey = "kilo.squat.ai/force-internal-ip"
internalIPAnnotationKey = "kilo.squat.ai/internal-ip"
keyAnnotationKey = "kilo.squat.ai/key"
@@ -119,7 +120,7 @@ func New(c kubernetes.Interface, kc kiloclient.Interface, ec apiextensions.Inter
// CleanUp removes configuration applied to the backend.
func (nb *nodeBackend) CleanUp(name string) error {
patch := []byte("[" + strings.Join([]string{
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(externalIPAnnotationKey, "/", jsonPatchSlash, 1))),
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(endpointAnnotationKey, "/", jsonPatchSlash, 1))),
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(internalIPAnnotationKey, "/", jsonPatchSlash, 1))),
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(keyAnnotationKey, "/", jsonPatchSlash, 1))),
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(lastSeenAnnotationKey, "/", jsonPatchSlash, 1))),
@@ -205,7 +206,7 @@ func (nb *nodeBackend) Set(name string, node *mesh.Node) error {
return fmt.Errorf("failed to find node: %v", err)
}
n := old.DeepCopy()
n.ObjectMeta.Annotations[externalIPAnnotationKey] = node.ExternalIP.String()
n.ObjectMeta.Annotations[endpointAnnotationKey] = node.Endpoint.String()
n.ObjectMeta.Annotations[internalIPAnnotationKey] = node.InternalIP.String()
n.ObjectMeta.Annotations[keyAnnotationKey] = string(node.Key)
n.ObjectMeta.Annotations[lastSeenAnnotationKey] = strconv.FormatInt(node.LastSeen, 10)
@@ -254,14 +255,15 @@ func translateNode(node *v1.Node) *mesh.Node {
if !ok {
location = node.ObjectMeta.Labels[regionLabelKey]
}
// Allow the IPs to be overridden.
externalIP, ok := node.ObjectMeta.Annotations[forceExternalIPAnnotationKey]
if !ok {
externalIP = node.ObjectMeta.Annotations[externalIPAnnotationKey]
// Allow the endpoint to be overridden.
endpoint := parseEndpoint(node.ObjectMeta.Annotations[forceEndpointAnnotationKey])
if endpoint == nil {
endpoint = parseEndpoint(node.ObjectMeta.Annotations[endpointAnnotationKey])
}
internalIP, ok := node.ObjectMeta.Annotations[forceInternalIPAnnotationKey]
if !ok {
internalIP = node.ObjectMeta.Annotations[internalIPAnnotationKey]
// Allow the internal IP to be overridden.
internalIP := normalizeIP(node.ObjectMeta.Annotations[forceInternalIPAnnotationKey])
if internalIP == nil {
internalIP = normalizeIP(node.ObjectMeta.Annotations[internalIPAnnotationKey])
}
// Set Wireguard PersistentKeepalive setting for the node.
var persistentKeepalive int64
@@ -281,12 +283,12 @@ func translateNode(node *v1.Node) *mesh.Node {
}
}
return &mesh.Node{
// ExternalIP and InternalIP should only ever fail to parse if the
// Endpoint and InternalIP should only ever fail to parse if the
// remote node's agent has not yet set its IP address;
// in this case the IP will be nil and
// the mesh can wait for the node to be updated.
ExternalIP: normalizeIP(externalIP),
InternalIP: normalizeIP(internalIP),
Endpoint: endpoint,
InternalIP: internalIP,
Key: []byte(node.ObjectMeta.Annotations[keyAnnotationKey]),
LastSeen: lastSeen,
Leader: leader,
@@ -325,8 +327,8 @@ func translatePeer(peer *v1alpha1.Peer) *mesh.Peer {
}
if peer.Spec.Endpoint.Port > 0 && ip != nil {
endpoint = &wireguard.Endpoint{
IP: ip,
Port: peer.Spec.Endpoint.Port,
DNSOrIP: wireguard.DNSOrIP{IP: ip},
Port: peer.Spec.Endpoint.Port,
}
}
}
@@ -487,3 +489,35 @@ func normalizeIP(ip string) *net.IPNet {
ipNet.IP = i.To16()
return ipNet
}
func parseEndpoint(endpoint string) *wireguard.Endpoint {
if len(endpoint) == 0 {
return nil
}
parts := strings.Split(endpoint, ":")
if len(parts) < 2 {
return nil
}
portRaw := parts[len(parts)-1]
hostRaw := strings.Trim(strings.Join(parts[:len(parts)-1], ":"), "[]")
port, err := strconv.ParseUint(portRaw, 10, 32)
if err != nil {
return nil
}
if len(validation.IsValidPortNum(int(port))) != 0 {
return nil
}
ip := net.ParseIP(hostRaw)
if ip == nil {
if len(validation.IsDNS1123Subdomain(hostRaw)) == 0 {
return &wireguard.Endpoint{DNSOrIP: wireguard.DNSOrIP{DNS: hostRaw}, Port: uint32(port)}
}
return nil
}
if ip4 := ip.To4(); ip4 != nil {
ip = ip4
} else {
ip = ip.To16()
}
return &wireguard.Endpoint{DNSOrIP: wireguard.DNSOrIP{IP: ip}, Port: uint32(port)}
}