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Sign protected branches (#8993) 

* Move SignMerge to PullRequest

* Add approved signing mode

* As per @guillep2k comment
This commit is contained in:
zeripath 2019-12-15 11:06:31 +00:00 committed by GitHub
parent e3c3b33ea7
commit 3abe17f9e0
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 129 additions and 97 deletions
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1
custom/conf/app.ini.sample
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@ -110,6 +110,7 @@ WIKI = never
; Determines when to sign on merges
; - basesigned: require that the parent of commit on the base repo is signed.
; - commitssigned: require that all the commits in the head branch are signed.
; - approved: only sign when merging an approved pr to a protected branch
MERGES = pubkey, twofa, basesigned, commitssigned
[cors]

3
docs/content/doc/advanced/config-cheat-sheet.en-us.md
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@ -96,7 +96,8 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
- `CRUD_ACTIONS`: **pubkey, twofa, parentsigned**: \[never, pubkey, twofa, parentsigned, always\]: Sign CRUD actions.
- Options as above, with the addition of:
- `parentsigned`: Only sign if the parent commit is signed.
- `MERGES`: **pubkey, twofa, basesigned, commitssigned**: \[never, pubkey, twofa, basesigned, commitssigned, always\]: Sign merges.
- `MERGES`: **pubkey, twofa, basesigned, commitssigned**: \[never, pubkey, twofa, approved, basesigned, commitssigned, always\]: Sign merges.
- `approved`: Only sign approved merges to a protected branch.
- `basesigned`: Only sign if the parent commit in the base repo is signed.
- `headsigned`: Only sign if the head commit in the head branch is signed.
- `commitssigned`: Only sign if all the commits in the head branch to the merge point are signed.

1
docs/content/doc/advanced/signing.en-us.md
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@ -136,6 +136,7 @@ The possible options are:
* `basesigned`: Only sign if the parent commit in the base repo is signed.
* `headsigned`: Only sign if the head commit in the head branch is signed.
* `commitssigned`: Only sign if all the commits in the head branch to the merge point are signed.
* `approved`: Only sign approved merges to a protected branch.
* `always`: Always sign
Options other than `never` and `always` can be combined as a comma

121
models/pull_sign.go Normal file
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@ -0,0 +1,121 @@
// 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 (
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
// SignMerge determines if we should sign a PR merge commit to the base repository
func (pr *PullRequest) SignMerge(u *User, tmpBasePath, baseCommit, headCommit string) (bool, string) {
if err := pr.GetBaseRepo(); err != nil {
log.Error("Unable to get Base Repo for pull request")
return false, ""
}
repo := pr.BaseRepo
signingKey := signingKey(repo.RepoPath())
if signingKey == "" {
return false, ""
}
rules := signingModeFromStrings(setting.Repository.Signing.Merges)
var gitRepo *git.Repository
var err error
for _, rule := range rules {
switch rule {
case never:
return false, ""
case always:
break
case pubkey:
keys, err := ListGPGKeys(u.ID)
if err != nil || len(keys) == 0 {
return false, ""
}
case twofa:
twofa, err := GetTwoFactorByUID(u.ID)
if err != nil || twofa == nil {
return false, ""
}
case approved:
protectedBranch, err := GetProtectedBranchBy(repo.ID, pr.BaseBranch)
if err != nil || protectedBranch == nil {
return false, ""
}
if protectedBranch.GetGrantedApprovalsCount(pr) < 1 {
return false, ""
}
case baseSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(baseCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
case headSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
case commitsSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
// need to work out merge-base
mergeBaseCommit, _, err := gitRepo.GetMergeBase("", baseCommit, headCommit)
if err != nil {
return false, ""
}
commitList, err := commit.CommitsBeforeUntil(mergeBaseCommit)
if err != nil {
return false, ""
}
for e := commitList.Front(); e != nil; e = e.Next() {
commit = e.Value.(*git.Commit)
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
}
}
}
return true, signingKey
}

98
models/repo_sign.go
View File

@ -24,6 +24,7 @@ const (
baseSigned signingMode = "basesigned"
headSigned signingMode = "headsigned"
commitsSigned signingMode = "commitssigned"
approved signingMode = "approved"
)
func signingModeFromStrings(modeStrings []string) []signingMode {
@ -45,6 +46,8 @@ func signingModeFromStrings(modeStrings []string) []signingMode {
fallthrough
case headSigned:
fallthrough
case approved:
fallthrough
case commitsSigned:
returnable = append(returnable, signMode)
}
@ -211,98 +214,3 @@ func (repo *Repository) SignCRUDAction(u *User, tmpBasePath, parentCommit string
}
return true, signingKey
}
// SignMerge determines if we should sign a merge commit to this repository
func (repo *Repository) SignMerge(u *User, tmpBasePath, baseCommit, headCommit string) (bool, string) {
rules := signingModeFromStrings(setting.Repository.Signing.Merges)
signingKey := signingKey(repo.RepoPath())
if signingKey == "" {
return false, ""
}
var gitRepo *git.Repository
var err error
for _, rule := range rules {
switch rule {
case never:
return false, ""
case always:
break
case pubkey:
keys, err := ListGPGKeys(u.ID)
if err != nil || len(keys) == 0 {
return false, ""
}
case twofa:
twofa, err := GetTwoFactorByUID(u.ID)
if err != nil || twofa == nil {
return false, ""
}
case baseSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(baseCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
case headSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
case commitsSigned:
if gitRepo == nil {
gitRepo, err = git.OpenRepository(tmpBasePath)
if err != nil {
return false, ""
}
defer gitRepo.Close()
}
commit, err := gitRepo.GetCommit(headCommit)
if err != nil {
return false, ""
}
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
// need to work out merge-base
mergeBaseCommit, _, err := gitRepo.GetMergeBase("", baseCommit, headCommit)
if err != nil {
return false, ""
}
commitList, err := commit.CommitsBeforeUntil(mergeBaseCommit)
if err != nil {
return false, ""
}
for e := commitList.Front(); e != nil; e = e.Next() {
commit = e.Value.(*git.Commit)
verification := ParseCommitWithSignature(commit)
if !verification.Verified {
return false, ""
}
}
}
}
return true, signingKey
}

2
services/pull/merge.go
View File

@ -162,7 +162,7 @@ func Merge(pr *models.PullRequest, doer *models.User, baseGitRepo *git.Repositor
// Determine if we should sign
signArg := ""
if version.Compare(binVersion, "1.7.9", ">=") {
sign, keyID := pr.BaseRepo.SignMerge(doer, tmpBasePath, "HEAD", trackingBranch)
sign, keyID := pr.SignMerge(doer, tmpBasePath, "HEAD", trackingBranch)
if sign {
signArg = "-S" + keyID
} else if version.Compare(binVersion, "2.0.0", ">=") {