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verification.go
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verification.go
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/*
* Copyright 2019 Travis Ralston <travis@t2bot.io>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package signing
import (
"errors"
"fmt"
"github.com/t2bot/matrix-key-server/util"
"golang.org/x/crypto/ed25519"
)
func VerifySignatures(obj interface{}, publicKeys map[string]map[string]ed25519.PublicKey) error {
m, err := util.InterfaceToMap(obj)
if err != nil {
return err
}
delete(m, "unsigned")
var signatures map[string]interface{}
if s, ok := m["signatures"]; !ok {
signatures = nil
} else {
signatures = s.(map[string]interface{})
}
delete(m, "signatures")
if len(signatures) == 0 {
return errors.New("no signatures found")
}
canonical, err := EncodeCanonicalJson(m)
if err != nil {
return err
}
// Verify all the signatures now
for domain, sig := range signatures {
var domainKeys map[string]ed25519.PublicKey
var ok bool
if domainKeys, ok = publicKeys[domain]; !ok {
return errors.New("missing public keys for " + domain)
}
keySigs := sig.(map[string]interface{})
for keyId, b64 := range keySigs {
var publicKey ed25519.PublicKey
if publicKey, ok = domainKeys[keyId]; !ok {
return errors.New(fmt.Sprintf("missing public key for %s %s", domain, keyId))
}
signature, err := DecodeUnpaddedBase64String(b64.(string))
if err != nil {
return err
}
valid := ed25519.Verify(publicKey, canonical, signature)
if !valid {
return errors.New(fmt.Sprintf("signature verification failed for %s %s", domain, keyId))
}
}
}
return nil
}