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forgejo/models/asymkey/ssh_key_verify.go
Giteabot b47482d58e
Retry SSH key verification with additional CRLF if it failed (#28392) (#28464)
Backport #28392 by @nekrondev

Windows-based shells will add a CRLF when piping the token into
ssh-keygen command resulting in
verification error. This resolves #21527.

Co-authored-by: nekrondev <heiko@noordsee.de>
Co-authored-by: Heiko Besemann <heiko.besemann@qbeyond.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
2023-12-14 12:50:26 +08:00

54 lines
1.4 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package asymkey
import (
"bytes"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/log"
"github.com/42wim/sshsig"
)
// VerifySSHKey marks a SSH key as verified
func VerifySSHKey(ownerID int64, fingerprint, token, signature string) (string, error) {
ctx, committer, err := db.TxContext(db.DefaultContext)
if err != nil {
return "", err
}
defer committer.Close()
key := new(PublicKey)
has, err := db.GetEngine(ctx).Where("owner_id = ? AND fingerprint = ?", ownerID, fingerprint).Get(key)
if err != nil {
return "", err
} else if !has {
return "", ErrKeyNotExist{}
}
err = sshsig.Verify(bytes.NewBuffer([]byte(token)), []byte(signature), []byte(key.Content), "gitea")
if err != nil {
// edge case for Windows based shells that will add CR LF if piped to ssh-keygen command
// see https://github.com/PowerShell/PowerShell/issues/5974
if sshsig.Verify(bytes.NewBuffer([]byte(token+"\r\n")), []byte(signature), []byte(key.Content), "gitea") != nil {
log.Error("Unable to validate token signature. Error: %v", err)
return "", ErrSSHInvalidTokenSignature{
Fingerprint: key.Fingerprint,
}
}
}
key.Verified = true
if _, err := db.GetEngine(ctx).ID(key.ID).Cols("verified").Update(key); err != nil {
return "", err
}
if err := committer.Commit(); err != nil {
return "", err
}
return key.Fingerprint, nil
}