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package dns
import (
"context"
"fmt"
"net"
"encoding/hex"
"git.sigsum.org/sigsum-log-go/pkg/types"
)
// Verifier can verify that a domain name is aware of a public key
type Verifier interface {
Verify(ctx context.Context, name string, key *[types.VerificationKeySize]byte) error
}
// DefaultResolver implements the Verifier interface with Go's default resolver
type DefaultResolver struct {
resolver net.Resolver
}
func NewDefaultResolver() Verifier {
return &DefaultResolver{}
}
func (dr *DefaultResolver) Verify(ctx context.Context, name string, key *[types.VerificationKeySize]byte) error {
rsp, err := dr.resolver.LookupTXT(ctx, name)
if err != nil {
return fmt.Errorf("domain name look-up failed: %v", err)
}
want := hex.EncodeToString(types.Hash(key[:])[:])
for _, got := range rsp {
if got == want {
return nil
}
}
return fmt.Errorf("%q is not aware of key hash %q", name, want)
}
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