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