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