A command line tool to interact with Gitea servers
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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package git
import (
"fmt"
"io/ioutil"
"net/url"
"code.gitea.io/tea/modules/utils"
git_transport "github.com/go-git/go-git/v5/plumbing/transport"
gogit_http "github.com/go-git/go-git/v5/plumbing/transport/http"
gogit_ssh "github.com/go-git/go-git/v5/plumbing/transport/ssh"
"golang.org/x/crypto/ssh"
)
type pwCallback = func(string) (string, error)
// GetAuthForURL returns the appropriate AuthMethod to be used in Push() / Pull()
// operations depending on the protocol, and prompts the user for credentials if
// necessary.
func GetAuthForURL(remoteURL *url.URL, authToken, keyFile string, passwordCallback pwCallback) (git_transport.AuthMethod, error) {
switch remoteURL.Scheme {
case "http", "https":
// gitea supports push/pull via app token as username.
return &gogit_http.BasicAuth{Password: "", Username: authToken}, nil
case "ssh":
// try to select right key via ssh-agent. if it fails, try to read a key manually
user := remoteURL.User.Username()
auth, err := gogit_ssh.DefaultAuthBuilder(user)
if err != nil {
signer, err2 := readSSHPrivKey(keyFile, passwordCallback)
if err2 != nil {
return nil, err2
}
auth = &gogit_ssh.PublicKeys{User: user, Signer: signer}
}
return auth, nil
}
return nil, fmt.Errorf("don't know how to handle url scheme %v", remoteURL.Scheme)
}
func readSSHPrivKey(keyFile string, passwordCallback pwCallback) (sig ssh.Signer, err error) {
if keyFile != "" {
keyFile, err = utils.AbsPathWithExpansion(keyFile)
} else {
keyFile, err = utils.AbsPathWithExpansion("~/.ssh/id_rsa")
}
if err != nil {
return nil, err
}
sshKey, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, err
}
sig, err = ssh.ParsePrivateKey(sshKey)
if _, ok := err.(*ssh.PassphraseMissingError); ok && passwordCallback != nil {
// allow for up to 3 password attempts
for i := 0; i < 3; i++ {
var pass string
pass, err = passwordCallback(keyFile)
if err != nil {
return nil, err
}
sig, err = ssh.ParsePrivateKeyWithPassphrase(sshKey, []byte(pass))
if err == nil {
break
}
}
}
return sig, err
}