96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
/*
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Copyright 2020 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package git
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import (
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"fmt"
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"net/url"
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"github.com/go-git/go-git/v5/plumbing/transport"
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"github.com/go-git/go-git/v5/plumbing/transport/http"
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"github.com/go-git/go-git/v5/plumbing/transport/ssh"
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corev1 "k8s.io/api/core/v1"
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"github.com/fluxcd/pkg/ssh/knownhosts"
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)
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const defaultPublicKeyAuthUser = "git"
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func AuthSecretStrategyForURL(URL string) (AuthSecretStrategy, error) {
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u, err := url.Parse(URL)
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if err != nil {
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return nil, fmt.Errorf("failed to parse URL to determine auth strategy: %w", err)
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}
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switch {
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case u.Scheme == "http", u.Scheme == "https":
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return &BasicAuth{}, nil
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case u.Scheme == "ssh":
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return &PublicKeyAuth{user: u.User.Username()}, nil
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default:
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return nil, fmt.Errorf("no auth secret strategy for scheme %s", u.Scheme)
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}
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}
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type AuthSecretStrategy interface {
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Method(secret corev1.Secret) (transport.AuthMethod, error)
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}
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type BasicAuth struct{}
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func (s *BasicAuth) Method(secret corev1.Secret) (transport.AuthMethod, error) {
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auth := &http.BasicAuth{}
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if username, ok := secret.Data["username"]; ok {
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auth.Username = string(username)
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}
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if password, ok := secret.Data["password"]; ok {
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auth.Password = string(password)
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}
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if auth.Username == "" || auth.Password == "" {
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return nil, fmt.Errorf("invalid '%s' secret data: required fields 'username' and 'password'", secret.Name)
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}
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return auth, nil
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}
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type PublicKeyAuth struct {
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user string
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}
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func (s *PublicKeyAuth) Method(secret corev1.Secret) (transport.AuthMethod, error) {
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identity := secret.Data["identity"]
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knownHosts := secret.Data["known_hosts"]
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if len(identity) == 0 || len(knownHosts) == 0 {
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return nil, fmt.Errorf("invalid '%s' secret data: required fields 'identity' and 'known_hosts'", secret.Name)
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}
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user := s.user
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if user == "" {
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user = defaultPublicKeyAuthUser
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}
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pk, err := ssh.NewPublicKeys(user, identity, "")
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if err != nil {
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return nil, err
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}
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callback, err := knownhosts.New(knownHosts)
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if err != nil {
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return nil, err
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}
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pk.HostKeyCallback = callback
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return pk, nil
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}
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