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gitea/services/asymkey/sign.go

389 lines
11 KiB

// Copyright 2021 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 asymkey
import (
"context"
"fmt"
"strings"
"code.gitea.io/gitea/models"
asymkey_model "code.gitea.io/gitea/models/asymkey"
"code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
user_model "code.gitea.io/gitea/models/user"
"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
}
// ErrWontSign explains the first reason why a commit would not be signed
// There may be other reasons - this is just the first reason found
type ErrWontSign struct {
Reason signingMode
}
func (e *ErrWontSign) Error() string {
return fmt.Sprintf("wont sign: %s", e.Reason)
}
// IsErrWontSign checks if an error is a ErrWontSign
func IsErrWontSign(err error) bool {
_, ok := err.(*ErrWontSign)
return ok
}
// SigningKey returns the KeyID and git Signature for the repo
func SigningKey(ctx context.Context, 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(ctx, "config", "--get", "commit.gpgsign").RunInDir(repoPath)
sign, valid := git.ParseBool(strings.TrimSpace(value))
if !sign || !valid {
return "", nil
}
signingKey, _ := git.NewCommand(ctx, "config", "--get", "user.signingkey").RunInDir(repoPath)
signingName, _ := git.NewCommand(ctx, "config", "--get", "user.name").RunInDir(repoPath)
signingEmail, _ := git.NewCommand(ctx, "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(ctx context.Context, repoPath string) (string, error) {
signingKey, _ := SigningKey(ctx, repoPath)
if signingKey == "" {
return "", nil
}
content, stderr, err := process.GetManager().ExecDir(ctx, -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(ctx context.Context, repoPath string, u *user_model.User) (bool, string, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.InitialCommit)
signingKey, sig := SigningKey(ctx, 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 := asymkey_model.ListGPGKeys(db.DefaultContext, u.ID, db.ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := auth.GetTwoFactorByUID(u.ID)
if err != nil && !auth.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 SignWikiCommit(ctx context.Context, repoWikiPath string, u *user_model.User) (bool, string, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.Wiki)
signingKey, sig := SigningKey(ctx, repoWikiPath)
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 := asymkey_model.ListGPGKeys(db.DefaultContext, u.ID, db.ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := auth.GetTwoFactorByUID(u.ID)
if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepositoryCtx(ctx, repoWikiPath)
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 := asymkey_model.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 SignCRUDAction(ctx context.Context, repoPath string, u *user_model.User, tmpBasePath, parentCommit string) (bool, string, *git.Signature, error) {
rules := signingModeFromStrings(setting.Repository.Signing.CRUDActions)
signingKey, sig := SigningKey(ctx, 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 := asymkey_model.ListGPGKeys(db.DefaultContext, u.ID, db.ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := auth.GetTwoFactorByUID(u.ID)
if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
case parentSigned:
gitRepo, err := git.OpenRepositoryCtx(ctx, 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 := asymkey_model.ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{parentSigned}
}
}
}
return true, signingKey, sig, nil
}
// SignMerge determines if we should sign a PR merge commit to the base repository
func SignMerge(ctx context.Context, pr *models.PullRequest, u *user_model.User, tmpBasePath, baseCommit, headCommit string) (bool, string, *git.Signature, error) {
if err := pr.LoadBaseRepo(); err != nil {
log.Error("Unable to get Base Repo for pull request")
return false, "", nil, err
}
repo := pr.BaseRepo
signingKey, signer := SigningKey(ctx, repo.RepoPath())
if signingKey == "" {
return false, "", nil, &ErrWontSign{noKey}
}
rules := signingModeFromStrings(setting.Repository.Signing.Merges)
var gitRepo *git.Repository
var err error
Loop:
for _, rule := range rules {
switch rule {
case never:
return false, "", nil, &ErrWontSign{never}
case always:
break Loop
case pubkey:
keys, err := asymkey_model.ListGPGKeys(db.DefaultContext, u.ID, db.ListOptions{})
if err != nil {
return false, "", nil, err
}
if len(keys) == 0 {
return false, "", nil, &ErrWontSign{pubkey}
}
case twofa:
twofaModel, err := auth.GetTwoFactorByUID(u.ID)
if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
return false, "", nil, err
}
if twofaModel == nil {
return false, "", nil, &ErrWontSign{twofa}
}
case approved:
protectedBranch, err := models.GetProtectedBranchBy(repo.ID, pr.BaseBranch)
if err != nil {
return false, "", nil, err
}
if protectedBranch == nil {
return false, "", nil, &ErrWontSign{approved}
}
if protectedBranch.GetGrantedApprovalsCount(pr) < 1 {
return false, "", nil, &ErrWontSign{approved}
}
case baseSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepositoryCtx(ctx, tmpBasePath)
if err != nil {
return false, "", nil, err
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(baseCommit)
if err != nil {
return false, "", nil, err
}
verification := asymkey_model.ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{baseSigned}
}
case headSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepositoryCtx(ctx, tmpBasePath)
if err != nil {
return false, "", nil, err
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, "", nil, err
}
verification := asymkey_model.ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{headSigned}
}
case commitsSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepositoryCtx(ctx, tmpBasePath)
if err != nil {
return false, "", nil, err
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, "", nil, err
}
verification := asymkey_model.ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{commitsSigned}
}
// need to work out merge-base
mergeBaseCommit, _, err := gitRepo.GetMergeBase("", baseCommit, headCommit)
if err != nil {
return false, "", nil, err
}
commitList, err := commit.CommitsBeforeUntil(mergeBaseCommit)
if err != nil {
return false, "", nil, err
}
for _, commit := range commitList {
verification := asymkey_model.ParseCommitWithSignature(commit)
if !verification.Verified {
return false, "", nil, &ErrWontSign{commitsSigned}
}
}
}
}
return true, signingKey, signer, nil
}