/
scramsha1.go
70 lines (57 loc) · 2.22 KB
/
scramsha1.go
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// Copyright 2021 FerretDB Inc.
//
// 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 password
import (
"crypto/md5"
"crypto/rand"
"crypto/sha1"
"encoding/hex"
"golang.org/x/crypto/pbkdf2"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// SCRAMSHA1Hash computes SCRAM-SHA-1 credentials and returns the document that should be stored.
func SCRAMSHA1Hash(username, password string) (*types.Document, error) {
salt := make([]byte, fixedScramSHA1Params.saltLen)
if _, err := rand.Read(salt); err != nil {
return nil, lazyerrors.Error(err)
}
doc, err := scramSHA1HashParams(username, password, salt, fixedScramSHA1Params)
if err != nil {
return nil, lazyerrors.Error(err)
}
return doc, nil
}
// fixedScramSHA1Params represent fixed password parameters for SCRAM-SHA-1 authentication.
var fixedScramSHA1Params = &scramParams{
iterationCount: 10_000,
saltLen: 16,
}
// scramSHA1HashParams hashes the password with the given salt and parameters,
// and returns the document that should be stored using a variation of the SCRAM-SHA-1 algorithm
// used by MongoDB.
func scramSHA1HashParams(username, password string, salt []byte, params *scramParams) (*types.Document, error) {
if len(salt) != int(params.saltLen) {
return nil, lazyerrors.Errorf("unexpected salt length: %d", len(salt))
}
md5sum := md5.New()
if _, err := md5sum.Write([]byte(username + ":mongo:" + password)); err != nil {
return nil, lazyerrors.Error(err)
}
src := md5sum.Sum(nil)
dst := make([]byte, hex.EncodedLen(len(src)))
hex.Encode(dst, src)
saltedPassword := pbkdf2.Key(dst, salt, params.iterationCount, sha1.Size, sha1.New)
return scramDoc(sha1.New, saltedPassword, salt, params)
}