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63587a4aef
Backport #27536 by @picsel2 Fixes #27535 Co-authored-by: Sebastian Grabowski <sebastian@grabel.de>
100 lines
3 KiB
Go
100 lines
3 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package asymkey
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import (
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"context"
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"fmt"
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"strings"
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"code.gitea.io/gitea/models/db"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"golang.org/x/crypto/ssh"
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)
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// ___________.__ .__ __
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// \_ _____/|__| ____ ____ ________________________|__| _____/ |_
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// | __) | |/ \ / ___\_/ __ \_ __ \____ \_ __ \ |/ \ __\
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// | \ | | | \/ /_/ > ___/| | \/ |_> > | \/ | | \ |
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// \___ / |__|___| /\___ / \___ >__| | __/|__| |__|___| /__|
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// \/ \//_____/ \/ |__| \/
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//
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// This file contains functions for fingerprinting SSH keys
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//
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// The database is used in checkKeyFingerprint however most of these functions probably belong in a module
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// checkKeyFingerprint only checks if key fingerprint has been used as public key,
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// it is OK to use same key as deploy key for multiple repositories/users.
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func checkKeyFingerprint(ctx context.Context, fingerprint string) error {
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has, err := db.GetByBean(ctx, &PublicKey{
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Fingerprint: fingerprint,
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})
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if err != nil {
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return err
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} else if has {
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return ErrKeyAlreadyExist{0, fingerprint, ""}
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}
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return nil
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}
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func calcFingerprintSSHKeygen(publicKeyContent string) (string, error) {
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// Calculate fingerprint.
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tmpPath, err := writeTmpKeyFile(publicKeyContent)
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if err != nil {
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return "", err
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}
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defer func() {
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if err := util.Remove(tmpPath); err != nil {
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log.Warn("Unable to remove temporary key file: %s: Error: %v", tmpPath, err)
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}
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}()
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stdout, stderr, err := process.GetManager().Exec("AddPublicKey", "ssh-keygen", "-lf", tmpPath)
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if err != nil {
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if strings.Contains(stderr, "is not a public key file") {
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return "", ErrKeyUnableVerify{stderr}
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}
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return "", util.NewInvalidArgumentErrorf("'ssh-keygen -lf %s' failed with error '%s': %s", tmpPath, err, stderr)
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} else if len(stdout) < 2 {
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return "", util.NewInvalidArgumentErrorf("not enough output for calculating fingerprint: %s", stdout)
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}
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return strings.Split(stdout, " ")[1], nil
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}
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func calcFingerprintNative(publicKeyContent string) (string, error) {
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// Calculate fingerprint.
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pk, _, _, _, err := ssh.ParseAuthorizedKey([]byte(publicKeyContent))
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if err != nil {
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return "", err
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}
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return ssh.FingerprintSHA256(pk), nil
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}
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// CalcFingerprint calculate public key's fingerprint
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func CalcFingerprint(publicKeyContent string) (string, error) {
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// Call the method based on configuration
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var (
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fnName, fp string
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err error
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)
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if len(setting.SSH.KeygenPath) == 0 {
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fnName = "calcFingerprintNative"
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fp, err = calcFingerprintNative(publicKeyContent)
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} else {
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fnName = "calcFingerprintSSHKeygen"
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fp, err = calcFingerprintSSHKeygen(publicKeyContent)
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}
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if err != nil {
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if IsErrKeyUnableVerify(err) {
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log.Info("%s", publicKeyContent)
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return "", err
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}
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return "", fmt.Errorf("%s: %w", fnName, err)
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}
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return fp, nil
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}
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