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https://github.com/bodgit/tsig
Golang library to support additional TSIG methods for DNS queries
https://github.com/bodgit/tsig
diffie-hellman dns golang golang-library gssapi kerberos rfc-2845 rfc-2930 rfc-3645 rfc-4635 rfc-8945 sspi tsig
Last synced: 3 days ago
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Golang library to support additional TSIG methods for DNS queries
- Host: GitHub
- URL: https://github.com/bodgit/tsig
- Owner: bodgit
- License: bsd-3-clause
- Created: 2018-01-13T22:17:34.000Z (over 6 years ago)
- Default Branch: main
- Last Pushed: 2024-08-29T22:19:31.000Z (about 1 month ago)
- Last Synced: 2024-08-30T00:19:09.248Z (about 1 month ago)
- Topics: diffie-hellman, dns, golang, golang-library, gssapi, kerberos, rfc-2845, rfc-2930, rfc-3645, rfc-4635, rfc-8945, sspi, tsig
- Language: Go
- Homepage: https://godoc.org/github.com/bodgit/tsig
- Size: 445 KB
- Stars: 11
- Watchers: 3
- Forks: 9
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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# Additional TSIG methods
The [github.com/bodgit/tsig](https://godoc.org/github.com/bodgit/tsig) package
adds support for additional TSIG methods used in DNS queries. It is designed
to be used alongside the [github.com/miekg/dns](https://github.com/miekg/dns)
package which is used to construct and parse DNS queries and responses.
This is most useful for allowing
[RFC 3645 GSS-TSIG](https://www.ietf.org/rfc/rfc3645.txt) which is necessary
for dealing with Windows DNS servers that require 'Secure only' updates or
BIND if it has been configured to use Kerberos.
> :warning: Windows DNS servers don't accept wildcard resource names in dynamic updates.
Here is an example client, it is necessary that your Kerberos or Active
Directory environment is configured and functional:
```golang
package main
import (
"fmt"
"time"
"github.com/bodgit/tsig"
"github.com/bodgit/tsig/gss"
"github.com/miekg/dns"
)
func main() {
dnsClient := new(dns.Client)
dnsClient.Net = "tcp"
gssClient, err := gss.NewClient(dnsClient)
if err != nil {
panic(err)
}
defer gssClient.Close()
host := "ns.example.com:53"
// Negotiate a context with the chosen server using the
// current user. See also gssClient.NegotiateContextWithCredentials()
// and gssClient.NegotiateContextWithKeytab() for alternatives
keyname, _, err := gssClient.NegotiateContext(host)
if err != nil {
panic(err)
}
dnsClient.TsigProvider = gssClient
// Use the DNS client as normal
msg := new(dns.Msg)
msg.SetUpdate(dns.Fqdn("example.com"))
insert, err := dns.NewRR("test.example.com. 300 A 192.0.2.1")
if err != nil {
panic(err)
}
msg.Insert([]dns.RR{insert})
msg.SetTsig(keyname, tsig.GSS, 300, time.Now().Unix())
rr, _, err := dnsClient.Exchange(msg, host)
if err != nil {
panic(err)
}
if rr.Rcode != dns.RcodeSuccess {
fmt.Printf("DNS error: %s (%d)\n", dns.RcodeToString[rr.Rcode], rr.Rcode)
}
// Cleanup the context
err = gssClient.DeleteContext(keyname)
if err != nil {
panic(err)
}
}
```
If you need to deal with both regular TSIG and GSS-TSIG together then this
package also exports an HMAC TSIG implementation. To use both together set
your client up something like this:
```golang
package main
import (
"github.com/bodgit/tsig"
"github.com/bodgit/tsig/gss"
"github.com/miekg/dns"
)
func main() {
dnsClient := new(dns.Client)
dnsClient.Net = "tcp"
// Create HMAC TSIG provider
hmac := tsig.HMAC{"axfr.": "so6ZGir4GPAqINNh9U5c3A=="}
// Create GSS-TSIG provider
gssClient, err := gss.NewClient(dnsClient)
if err != nil {
panic(err)
}
defer gssClient.Close()
// Configure DNS client with both providers
dnsClient.TsigProvider = tsig.MultiProvider(hmac, gssClient)
// Use the DNS client as normal
}
```