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// Copyright 2019 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 models
import (
"strings"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/setting"
)
type signingMode string
const (
never signingMode = "never"
always signingMode = "always"
pubkey signingMode = "pubkey"
twofa signingMode = "twofa"
parentSigned signingMode = "parentsigned"
baseSigned signingMode = "basesigned"
headSigned signingMode = "headsigned"
commitsSigned signingMode = "commitssigned"
approved signingMode = "approved"
noKey signingMode = "nokey"
)
func signingModeFromStrings(modeStrings []string) []signingMode {
returnable := make([]signingMode, 0, len(modeStrings))
for _, mode := range modeStrings {
signMode := signingMode(strings.ToLower(mode))
switch signMode {
case never:
return []signingMode{never}
case always:
return []signingMode{always}
case pubkey:
fallthrough
case twofa:
fallthrough
case parentSigned:
fallthrough
case baseSigned:
fallthrough
case headSigned:
fallthrough
case approved:
fallthrough
case commitsSigned:
returnable = append(returnable, signMode)
}
}
if len(returnable) == 0 {
return []signingMode{never}
}
return returnable
}
func signingKey(repoPath string) string {
if setting.Repository.Signing.SigningKey == "none" {
return ""
}
if setting.Repository.Signing.SigningKey == "default" || setting.Repository.Signing.SigningKey == "" {
// Can ignore the error here as it means that commit.gpgsign is not set
value, _ := git.NewCommand("config", "--get", "commit.gpgsign").RunInDir(repoPath)
sign, valid := git.ParseBool(strings.TrimSpace(value))
if !sign || !valid {
return ""
}
signingKey, _ := git.NewCommand("config", "--get", "user.signingkey").RunInDir(repoPath)
return strings.TrimSpace(signingKey)
}
return setting.Repository.Signing.SigningKey
}
// PublicSigningKey gets the public signing key within a provided repository directory
func PublicSigningKey(repoPath string) (string, error) {
signingKey := signingKey(repoPath)
if signingKey == "" {
return "", nil
}
content, stderr, err := process.GetManager().ExecDir(-1, repoPath,
"gpg --export -a", "gpg", "--export", "-a", signingKey)
if err != nil {
log.Error("Unable to get default signing key in %s: %s, %s, %v", repoPath, signingKey, stderr, err)
return "", err
}
return content, nil
}
// SignInitialCommit determines if we should sign the initial commit to this repository
func SignInitialCommit(repoPath string, u *User) (bool, string, error) {
rules := signingModeFromStrings(setting.Repository.Signing.InitialCommit)
signingKey := signingKey(repoPath)
if signingKey == "" {
return false, "", &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", err
}
if len(keys) == 0 {
return false, "", &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", err
}
if twofaModel == nil {
return false, "", &ErrWontSign{twofa}
}
}
}
return true, signingKey, nil
}
// SignWikiCommit determines if we should sign the commits to this repository wiki
func (repo *Repository) SignWikiCommit(u *User) (bool, string, error) {
rules := signingModeFromStrings(setting.Repository.Signing.Wiki)
signingKey := signingKey(repo.WikiPath())
if signingKey == "" {
return false, "", &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", err
}
if len(keys) == 0 {
return false, "", &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", err
}
if twofaModel == nil {
return false, "", &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepository(repo.WikiPath())
if err != nil {
return false, "", err
}
defer gitRepo.Close()
commit, err := gitRepo.GetCommit("HEAD")
if err != nil {
return false, "", err
}
if commit.Signature == nil {
return false, "", &ErrWontSign{parentSigned}
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", &ErrWontSign{parentSigned}
}
}
}
return true, signingKey, nil
}
// SignCRUDAction determines if we should sign a CRUD commit to this repository
func (repo *Repository) SignCRUDAction(u *User, tmpBasePath, parentCommit string) (bool, string, error) {
rules := signingModeFromStrings(setting.Repository.Signing.CRUDActions)
signingKey := signingKey(repo.RepoPath())
if signingKey == "" {
return false, "", &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", err
}
if len(keys) == 0 {
return false, "", &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", err
}
if twofaModel == nil {
return false, "", &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepository(tmpBasePath)
if err != nil {
return false, "", err
}
defer gitRepo.Close()
commit, err := gitRepo.GetCommit(parentCommit)
if err != nil {
return false, "", err
}
if commit.Signature == nil {
return false, "", &ErrWontSign{parentSigned}
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", &ErrWontSign{parentSigned}
}
}
}
return true, signingKey, nil
}
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