136 lines
3.7 KiB
Go
136 lines
3.7 KiB
Go
package headscale
|
|
|
|
import (
|
|
"encoding/json"
|
|
"net/netip"
|
|
"strings"
|
|
|
|
"github.com/tailscale/hujson"
|
|
"gopkg.in/yaml.v3"
|
|
)
|
|
|
|
// ACLPolicy represents a Tailscale ACL Policy.
|
|
type ACLPolicy struct {
|
|
Groups Groups `json:"groups" yaml:"groups"`
|
|
Hosts Hosts `json:"hosts" yaml:"hosts"`
|
|
TagOwners TagOwners `json:"tagOwners" yaml:"tagOwners"`
|
|
ACLs []ACL `json:"acls" yaml:"acls"`
|
|
Tests []ACLTest `json:"tests" yaml:"tests"`
|
|
AutoApprovers AutoApprovers `json:"autoApprovers" yaml:"autoApprovers"`
|
|
}
|
|
|
|
// ACL is a basic rule for the ACL Policy.
|
|
type ACL struct {
|
|
Action string `json:"action" yaml:"action"`
|
|
Protocol string `json:"proto" yaml:"proto"`
|
|
Sources []string `json:"src" yaml:"src"`
|
|
Destinations []string `json:"dst" yaml:"dst"`
|
|
}
|
|
|
|
// Groups references a series of alias in the ACL rules.
|
|
type Groups map[string][]string
|
|
|
|
// Hosts are alias for IP addresses or subnets.
|
|
type Hosts map[string]netip.Prefix
|
|
|
|
// TagOwners specify what users (namespaces?) are allow to use certain tags.
|
|
type TagOwners map[string][]string
|
|
|
|
// ACLTest is not implemented, but should be use to check if a certain rule is allowed.
|
|
type ACLTest struct {
|
|
Source string `json:"src" yaml:"src"`
|
|
Accept []string `json:"accept" yaml:"accept"`
|
|
Deny []string `json:"deny,omitempty" yaml:"deny,omitempty"`
|
|
}
|
|
|
|
// AutoApprovers specify which users (namespaces?), groups or tags have their advertised routes
|
|
// or exit node status automatically enabled.
|
|
type AutoApprovers struct {
|
|
Routes map[string][]string `json:"routes" yaml:"routes"`
|
|
ExitNode []string `json:"exitNode" yaml:"exitNode"`
|
|
}
|
|
|
|
// UnmarshalJSON allows to parse the Hosts directly into netip objects.
|
|
func (hosts *Hosts) UnmarshalJSON(data []byte) error {
|
|
newHosts := Hosts{}
|
|
hostIPPrefixMap := make(map[string]string)
|
|
ast, err := hujson.Parse(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ast.Standardize()
|
|
data = ast.Pack()
|
|
err = json.Unmarshal(data, &hostIPPrefixMap)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for host, prefixStr := range hostIPPrefixMap {
|
|
if !strings.Contains(prefixStr, "/") {
|
|
prefixStr += "/32"
|
|
}
|
|
prefix, err := netip.ParsePrefix(prefixStr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
newHosts[host] = prefix
|
|
}
|
|
*hosts = newHosts
|
|
|
|
return nil
|
|
}
|
|
|
|
// UnmarshalYAML allows to parse the Hosts directly into netip objects.
|
|
func (hosts *Hosts) UnmarshalYAML(data []byte) error {
|
|
newHosts := Hosts{}
|
|
hostIPPrefixMap := make(map[string]string)
|
|
|
|
err := yaml.Unmarshal(data, &hostIPPrefixMap)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for host, prefixStr := range hostIPPrefixMap {
|
|
prefix, err := netip.ParsePrefix(prefixStr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
newHosts[host] = prefix
|
|
}
|
|
*hosts = newHosts
|
|
|
|
return nil
|
|
}
|
|
|
|
// IsZero is perhaps a bit naive here.
|
|
func (policy ACLPolicy) IsZero() bool {
|
|
if len(policy.Groups) == 0 && len(policy.Hosts) == 0 && len(policy.ACLs) == 0 {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Returns the list of autoApproving namespaces, groups or tags for a given IPPrefix.
|
|
func (autoApprovers *AutoApprovers) GetRouteApprovers(
|
|
prefix netip.Prefix,
|
|
) ([]string, error) {
|
|
if prefix.Bits() == 0 {
|
|
return autoApprovers.ExitNode, nil // 0.0.0.0/0, ::/0 or equivalent
|
|
}
|
|
|
|
approverAliases := []string{}
|
|
|
|
for autoApprovedPrefix, autoApproverAliases := range autoApprovers.Routes {
|
|
autoApprovedPrefix, err := netip.ParsePrefix(autoApprovedPrefix)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if autoApprovedPrefix.Bits() >= prefix.Bits() &&
|
|
autoApprovedPrefix.Contains(prefix.Masked().Addr()) {
|
|
approverAliases = append(approverAliases, autoApproverAliases...)
|
|
}
|
|
}
|
|
|
|
return approverAliases, nil
|
|
}
|