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73 lines
2.3 KiB
Go
73 lines
2.3 KiB
Go
// Copyright (c) 2018 Shivaram Lingamneni
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package irc
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"github.com/tidwall/buntdb"
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"golang.org/x/crypto/bcrypt"
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)
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var (
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errInvalidPasswordHash = errors.New("invalid password hash")
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)
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// Decode a hashed passphrase as it would appear in a config file,
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// retaining compatibility with old versions of `oragono genpasswd`
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// that used to apply a redundant layer of base64
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func decodeLegacyPasswordHash(hash string) ([]byte, error) {
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// a correctly formatted bcrypt hash is 60 bytes of printable ASCII
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if len(hash) == 80 {
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// double-base64, remove the outer layer:
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return base64.StdEncoding.DecodeString(hash)
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} else if len(hash) == 60 {
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return []byte(hash), nil
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} else {
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return nil, errInvalidPasswordHash
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}
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}
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// helper to check a version 0 password hash, with global and per-passphrase salts
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func checkLegacyPasswordV0(hashedPassword, globalSalt, passphraseSalt []byte, passphrase string) error {
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var assembledPasswordBytes []byte
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assembledPasswordBytes = append(assembledPasswordBytes, globalSalt...)
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assembledPasswordBytes = append(assembledPasswordBytes, '-')
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assembledPasswordBytes = append(assembledPasswordBytes, passphraseSalt...)
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assembledPasswordBytes = append(assembledPasswordBytes, '-')
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assembledPasswordBytes = append(assembledPasswordBytes, []byte(passphrase)...)
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return bcrypt.CompareHashAndPassword(hashedPassword, assembledPasswordBytes)
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}
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// checks a version 0 password hash; if successful, upgrades the database entry to version 1
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func handleLegacyPasswordV0(server *Server, account string, credentials AccountCredentials, passphrase string) (err error) {
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var globalSaltString string
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err = server.store.View(func(tx *buntdb.Tx) (err error) {
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globalSaltString, err = tx.Get("crypto.salt")
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return err
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})
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if err != nil {
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return err
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}
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globalSalt, err := base64.StdEncoding.DecodeString(globalSaltString)
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if err != nil {
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return err
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}
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err = checkLegacyPasswordV0(credentials.PassphraseHash, globalSalt, credentials.PassphraseSalt, passphrase)
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if err != nil {
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// invalid password
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return err
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}
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// upgrade credentials
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err = server.accounts.setPassword(account, passphrase)
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if err != nil {
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server.logger.Error("internal", fmt.Sprintf("could not upgrade user password: %v", err))
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}
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return nil
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}
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