85f549b529
* plugin/dnssec: add per server metrics final plugin. Fixes #1696 #1492 #1189 * Move cache cap into handler so we can access the server label * Remove cache-capacity from it entirely
146 lines
2.9 KiB
Go
146 lines
2.9 KiB
Go
package dnssec
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/metrics"
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"github.com/coredns/coredns/plugin/pkg/cache"
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clog "github.com/coredns/coredns/plugin/pkg/log"
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"github.com/mholt/caddy"
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)
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var log = clog.NewWithPlugin("dnssec")
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func init() {
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caddy.RegisterPlugin("dnssec", caddy.Plugin{
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ServerType: "dns",
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Action: setup,
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})
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}
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func setup(c *caddy.Controller) error {
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zones, keys, capacity, err := dnssecParse(c)
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if err != nil {
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return plugin.Error("dnssec", err)
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}
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ca := cache.New(capacity)
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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return New(zones, keys, next, ca)
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})
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c.OnStartup(func() error {
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once.Do(func() {
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metrics.MustRegister(c, cacheSize, cacheHits, cacheMisses)
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})
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return nil
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})
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return nil
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}
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func dnssecParse(c *caddy.Controller) ([]string, []*DNSKEY, int, error) {
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zones := []string{}
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keys := []*DNSKEY{}
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capacity := defaultCap
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i := 0
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for c.Next() {
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if i > 0 {
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return nil, nil, 0, plugin.ErrOnce
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}
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i++
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// dnssec [zones...]
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zones = make([]string, len(c.ServerBlockKeys))
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copy(zones, c.ServerBlockKeys)
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args := c.RemainingArgs()
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if len(args) > 0 {
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zones = args
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}
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for c.NextBlock() {
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switch x := c.Val(); x {
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case "key":
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k, e := keyParse(c)
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if e != nil {
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return nil, nil, 0, e
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}
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keys = append(keys, k...)
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case "cache_capacity":
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if !c.NextArg() {
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return nil, nil, 0, c.ArgErr()
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}
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value := c.Val()
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cacheCap, err := strconv.Atoi(value)
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if err != nil {
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return nil, nil, 0, err
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}
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capacity = cacheCap
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default:
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return nil, nil, 0, c.Errf("unknown property '%s'", x)
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}
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}
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}
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for i := range zones {
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zones[i] = plugin.Host(zones[i]).Normalize()
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}
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// Check if each keys owner name can actually sign the zones we want them to sign.
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for _, k := range keys {
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kname := plugin.Name(k.K.Header().Name)
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ok := false
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for i := range zones {
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if kname.Matches(zones[i]) {
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ok = true
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break
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}
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}
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if !ok {
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return zones, keys, capacity, fmt.Errorf("key %s (keyid: %d) can not sign any of the zones", string(kname), k.tag)
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}
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}
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return zones, keys, capacity, nil
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}
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func keyParse(c *caddy.Controller) ([]*DNSKEY, error) {
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keys := []*DNSKEY{}
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if !c.NextArg() {
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return nil, c.ArgErr()
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}
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value := c.Val()
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if value == "file" {
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ks := c.RemainingArgs()
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if len(ks) == 0 {
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return nil, c.ArgErr()
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}
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for _, k := range ks {
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base := k
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// Kmiek.nl.+013+26205.key, handle .private or without extension: Kmiek.nl.+013+26205
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if strings.HasSuffix(k, ".key") {
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base = k[:len(k)-4]
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}
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if strings.HasSuffix(k, ".private") {
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base = k[:len(k)-8]
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}
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k, err := ParseKeyFile(base+".key", base+".private")
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if err != nil {
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return nil, err
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}
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keys = append(keys, k)
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}
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}
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return keys, nil
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}
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