1
1
mirror of https://github.com/go-gitea/gitea synced 2024-12-24 17:44:27 +00:00
gitea/models/repo_sign.go
zeripath 4979f15c3f
Add configurable Trust Models (#11712)
* Add configurable Trust Models

Gitea's default signature verification model differs from GitHub. GitHub
uses signatures to verify that the committer is who they say they are -
meaning that when GitHub makes a signed commit it must be the committer.
The GitHub model prevents re-publishing of commits after revocation of a
key and prevents re-signing of other people's commits to create a
completely trusted repository signed by one key or a set of trusted
keys.

The default behaviour of Gitea in contrast is to always display the
avatar and information related to a signature. This allows signatures to
be decoupled from the committer. That being said, allowing arbitary
users to present other peoples commits as theirs is not necessarily
desired therefore we have a trust model whereby signatures from
collaborators are marked trusted, signatures matching the commit line
are marked untrusted and signatures that match a user in the db but not
the committer line are marked unmatched.

The problem with this model is that this conflicts with Github therefore
we need to provide an option to allow users to choose the Github model
should they wish to.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Adjust locale strings

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @6543

Co-authored-by: 6543 <6543@obermui.de>

* Update models/gpg_key.go

* Add migration for repository

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
2020-09-20 00:44:55 +08:00

248 lines
6.9 KiB
Go

// 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(strings.TrimSpace(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
}
// SigningKey returns the KeyID and git Signature for the repo
func SigningKey(repoPath string) (string, *git.Signature) {
if setting.Repository.Signing.SigningKey == "none" {
return "", nil
}
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 "", nil
}
signingKey, _ := git.NewCommand("config", "--get", "user.signingkey").RunInDir(repoPath)
signingName, _ := git.NewCommand("config", "--get", "user.name").RunInDir(repoPath)
signingEmail, _ := git.NewCommand("config", "--get", "user.email").RunInDir(repoPath)
return strings.TrimSpace(signingKey), &git.Signature{
Name: strings.TrimSpace(signingName),
Email: strings.TrimSpace(signingEmail),
}
}
return setting.Repository.Signing.SigningKey, &git.Signature{
Name: setting.Repository.Signing.SigningName,
Email: setting.Repository.Signing.SigningEmail,
}
}
// 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, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.InitialCommit)
signingKey, sig := SigningKey(repoPath)
if signingKey == "" {
return false, "", nil, &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", nil, &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
}
}
return true, signingKey, sig, nil
}
// SignWikiCommit determines if we should sign the commits to this repository wiki
func (repo *Repository) SignWikiCommit(u *User) (bool, string, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.Wiki)
signingKey, sig := SigningKey(repo.WikiPath())
if signingKey == "" {
return false, "", nil, &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", nil, &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepository(repo.WikiPath())
if err != nil {
return false, "", nil, err
}
defer gitRepo.Close()
commit, err := gitRepo.GetCommit("HEAD")
if err != nil {
return false, "", nil, err
}
if commit.Signature == nil {
return false, "", nil, &ErrWontSign{parentSigned}
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{parentSigned}
}
}
}
return true, signingKey, sig, nil
}
// SignCRUDAction determines if we should sign a CRUD commit to this repository
func (repo *Repository) SignCRUDAction(u *User, tmpBasePath, parentCommit string) (bool, string, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.CRUDActions)
signingKey, sig := SigningKey(repo.RepoPath())
if signingKey == "" {
return false, "", nil, &ErrWontSign{noKey}
}
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", nil, &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := ListGPGKeys(u.ID, ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := GetTwoFactorByUID(u.ID)
if err != nil && !IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepository(tmpBasePath)
if err != nil {
return false, "", nil, err
}
defer gitRepo.Close()
commit, err := gitRepo.GetCommit(parentCommit)
if err != nil {
return false, "", nil, err
}
if commit.Signature == nil {
return false, "", nil, &ErrWontSign{parentSigned}
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{parentSigned}
}
}
}
return true, signingKey, sig, nil
}