Yet Another DKIM Verifier
Why not?
I found some DKIM solution for go, but I don’t like untested C binding and I have some time (thank you mr.Putin) I wrote this code for my pet project.
What can we do?
We can verify DKIM headers very fast. It is about 44mb per second on my laptop. We support custom resolving and custom cache logic.
TODO
- Support Length tag
- Support Time
- Support ExpireTime
- Support Copied header fields (z=)
- Sign
How to use it?
package main
import (
"bufio"
"flag"
"fmt"
"os"
"github.com/kalloc/dkim"
)
// ./test path/to/emls/*.eml
func main() {
var (
filename string
fp *os.File
err error
dk *dkim.DKIM
)
flag.Parse()
for _, filename = range flag.Args() {
fmt.Printf("Check: %s — ", filename)
if fp, err = os.Open(filename); err != nil {
fmt.Printf("ERR-WRONG_FILE")
} else if dk, _ = dkim.ParseEml(bufio.NewReader(fp)); dk == nil {
fmt.Printf("ERR-DKIM_NOT_FOUND")
} else if _, err = dk.GetPublicKey(); err != nil {
fmt.Printf("ERR-DKIM_PK_NOT_FOUND")
} else if dk.Verify() == false {
fmt.Printf("ERR-DKIM_NOT_VERIFIED (Body is %v, Sig is %v)", dk.Status.ValidBody, dk.Status.Valid)
} else {
fmt.Printf("OK")
}
fmt.Printf("\n")
}
}