6fe756dc93
* Add support for ssh commit signing * Split out ssh verification to separate file * Show ssh key fingerprint on commit page * Update sshsig lib * Make sure we verify against correct namespace * Add ssh public key verification via ssh signatures When adding a public ssh key also validate that this user actually owns the key by signing a token with the private key. * Remove some gpg references and make verify key optional * Fix spaces indentation * Update options/locale/locale_en-US.ini Co-authored-by: Gusted <williamzijl7@hotmail.com> * Update templates/user/settings/keys_ssh.tmpl Co-authored-by: Gusted <williamzijl7@hotmail.com> * Update options/locale/locale_en-US.ini Co-authored-by: Gusted <williamzijl7@hotmail.com> * Update options/locale/locale_en-US.ini Co-authored-by: Gusted <williamzijl7@hotmail.com> * Update models/ssh_key_commit_verification.go Co-authored-by: Gusted <williamzijl7@hotmail.com> * Reword ssh/gpg_key_success message * Change Badsignature to NoKeyFound * Add sign/verify tests * Fix upstream api changes to user_model User * Match exact on SSH signature * Fix code review remarks Co-authored-by: Gusted <williamzijl7@hotmail.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
96 lines
2.4 KiB
Go
Vendored
96 lines
2.4 KiB
Go
Vendored
// Modified by 42wim
|
|
//
|
|
// Copyright 2021 The Sigstore Authors.
|
|
//
|
|
// 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 sshsig
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/42wim/sshsig/pem"
|
|
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
const (
|
|
pemType = "SSH SIGNATURE"
|
|
)
|
|
|
|
// Armored returns the signature in an armored format.
|
|
func Armor(s *ssh.Signature, p ssh.PublicKey, ns string) []byte {
|
|
sig := WrappedSig{
|
|
Version: 1,
|
|
PublicKey: string(p.Marshal()),
|
|
Namespace: ns,
|
|
HashAlgorithm: defaultHashAlgorithm,
|
|
Signature: string(ssh.Marshal(s)),
|
|
}
|
|
|
|
copy(sig.MagicHeader[:], magicHeader)
|
|
|
|
enc := pem.EncodeToMemory(&pem.Block{
|
|
Type: pemType,
|
|
Bytes: ssh.Marshal(sig),
|
|
})
|
|
return enc
|
|
}
|
|
|
|
// Decode parses an armored signature.
|
|
func Decode(b []byte) (*Signature, error) {
|
|
pemBlock, _ := pem.Decode(b)
|
|
if pemBlock == nil {
|
|
return nil, errors.New("unable to decode pem file")
|
|
}
|
|
|
|
if pemBlock.Type != pemType {
|
|
return nil, fmt.Errorf("wrong pem block type: %s. Expected SSH-SIGNATURE", pemBlock.Type)
|
|
}
|
|
|
|
// Now we unmarshal it into the Signature block
|
|
sig := WrappedSig{}
|
|
if err := ssh.Unmarshal(pemBlock.Bytes, &sig); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if sig.Version != 1 {
|
|
return nil, fmt.Errorf("unsupported signature version: %d", sig.Version)
|
|
}
|
|
if string(sig.MagicHeader[:]) != magicHeader {
|
|
return nil, fmt.Errorf("invalid magic header: %s", sig.MagicHeader[:])
|
|
}
|
|
if _, ok := supportedHashAlgorithms[sig.HashAlgorithm]; !ok {
|
|
return nil, fmt.Errorf("unsupported hash algorithm: %s", sig.HashAlgorithm)
|
|
}
|
|
|
|
// Now we can unpack the Signature and PublicKey blocks
|
|
sshSig := ssh.Signature{}
|
|
if err := ssh.Unmarshal([]byte(sig.Signature), &sshSig); err != nil {
|
|
return nil, err
|
|
}
|
|
// TODO: check the format here (should be rsa-sha512)
|
|
|
|
pk, err := ssh.ParsePublicKey([]byte(sig.PublicKey))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &Signature{
|
|
signature: &sshSig,
|
|
pk: pk,
|
|
hashAlg: sig.HashAlgorithm,
|
|
}, nil
|
|
}
|