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