/* Copyright 2020 The Flux 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 git import ( "fmt" "net/url" "github.com/go-git/go-git/v5/plumbing/transport" "github.com/go-git/go-git/v5/plumbing/transport/http" "github.com/go-git/go-git/v5/plumbing/transport/ssh" corev1 "k8s.io/api/core/v1" "github.com/fluxcd/pkg/ssh/knownhosts" ) const defaultPublicKeyAuthUser = "git" func AuthSecretStrategyForURL(URL string) (AuthSecretStrategy, error) { u, err := url.Parse(URL) if err != nil { return nil, fmt.Errorf("failed to parse URL to determine auth strategy: %w", err) } switch { case u.Scheme == "http", u.Scheme == "https": return &BasicAuth{}, nil case u.Scheme == "ssh": return &PublicKeyAuth{user: u.User.Username()}, nil default: return nil, fmt.Errorf("no auth secret strategy for scheme %s", u.Scheme) } } type AuthSecretStrategy interface { Method(secret corev1.Secret) (transport.AuthMethod, error) } type BasicAuth struct{} func (s *BasicAuth) Method(secret corev1.Secret) (transport.AuthMethod, error) { auth := &http.BasicAuth{} if username, ok := secret.Data["username"]; ok { auth.Username = string(username) } if password, ok := secret.Data["password"]; ok { auth.Password = string(password) } if auth.Username == "" || auth.Password == "" { return nil, fmt.Errorf("invalid '%s' secret data: required fields 'username' and 'password'", secret.Name) } return auth, nil } type PublicKeyAuth struct { user string } func (s *PublicKeyAuth) Method(secret corev1.Secret) (transport.AuthMethod, error) { identity := secret.Data["identity"] knownHosts := secret.Data["known_hosts"] if len(identity) == 0 || len(knownHosts) == 0 { return nil, fmt.Errorf("invalid '%s' secret data: required fields 'identity' and 'known_hosts'", secret.Name) } user := s.user if user == "" { user = defaultPublicKeyAuthUser } pk, err := ssh.NewPublicKeys(user, identity, "") if err != nil { return nil, err } callback, err := knownhosts.New(knownHosts) if err != nil { return nil, err } pk.HostKeyCallback = callback return pk, nil }