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Sign merges, CRUD, Wiki and Repository initialisation with gpg key (#7631)

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This PR fixes #7598 by providing a configurable way of signing commits across the Gitea instance. Per repository configurability and import/generation of trusted secure keys is not provided by this PR - from a security PoV that's probably impossible to do properly. Similarly web-signing, that is asking the user to sign something, is not implemented - this could be done at a later stage however.

## Features
- [x] If commit.gpgsign is set in .gitconfig sign commits and files created through repofiles. (merges should already have been signed.)
- [x] Verify commits signed with the default gpg as valid
- [x] Signer, Committer and Author can all be different
    - [x] Allow signer to be arbitrarily different - We still require the key to have an activated email on Gitea. A more complete implementation would be to use a keyserver and mark external-or-unactivated with an "unknown" trust level icon.
- [x] Add a signing-key.gpg endpoint to get the default gpg pub key if available
    - Rather than add a fake web-flow user I've added this as an endpoint on /api/v1/signing-key.gpg
    - [x] Try to match the default key with a user on gitea - this is done at verification time
- [x] Make things configurable?
    - app.ini configuration done
    - [x] when checking commits are signed need to check if they're actually verifiable too
- [x] Add documentation

I have decided that adjusting the docker to create a default gpg key is not the correct thing to do and therefore have not implemented this.
This commit is contained in:
zeripath 2019-10-16 14:42:42 +01:00 • committed by GitHub
parent 1b72690cb8
commit fcb535c5c3
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
40 changed files with 1630 additions and 124 deletions
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60
models/repo.go
View file

@ -38,6 +38,7 @@ import (
"code.gitea.io/gitea/modules/timeutil"
"github.com/go-xorm/xorm"
"github.com/mcuadros/go-version"
"github.com/unknwon/com"
ini "gopkg.in/ini.v1"
"xorm.io/builder"
@ -1126,7 +1127,20 @@ func CleanUpMigrateInfo(repo *Repository) (*Repository, error) {
}
// initRepoCommit temporarily changes with work directory.
func initRepoCommit(tmpPath string, sig *git.Signature) (err error) {
func initRepoCommit(tmpPath string, u *User) (err error) {
commitTimeStr := time.Now().Format(time.RFC3339)
sig := u.NewGitSig()
// Because this may call hooks we should pass in the environment
env := append(os.Environ(),
"GIT_AUTHOR_NAME="+sig.Name,
"GIT_AUTHOR_EMAIL="+sig.Email,
"GIT_AUTHOR_DATE="+commitTimeStr,
"GIT_COMMITTER_NAME="+sig.Name,
"GIT_COMMITTER_EMAIL="+sig.Email,
"GIT_COMMITTER_DATE="+commitTimeStr,
)
var stderr string
if _, stderr, err = process.GetManager().ExecDir(-1,
tmpPath, fmt.Sprintf("initRepoCommit (git add): %s", tmpPath),
@ -1134,10 +1148,29 @@ func initRepoCommit(tmpPath string, sig *git.Signature) (err error) {
return fmt.Errorf("git add: %s", stderr)
}
if _, stderr, err = process.GetManager().ExecDir(-1,
binVersion, err := git.BinVersion()
if err != nil {
return fmt.Errorf("Unable to get git version: %v", err)
}
args := []string{
"commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email),
"-m", "Initial commit",
}
if version.Compare(binVersion, "1.7.9", ">=") {
sign, keyID := SignInitialCommit(tmpPath, u)
if sign {
args = append(args, "-S"+keyID)
} else if version.Compare(binVersion, "2.0.0", ">=") {
args = append(args, "--no-gpg-sign")
}
}
if _, stderr, err = process.GetManager().ExecDirEnv(-1,
tmpPath, fmt.Sprintf("initRepoCommit (git commit): %s", tmpPath),
git.GitExecutable, "commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email),
"-m", "Initial commit"); err != nil {
env,
git.GitExecutable, args...); err != nil {
return fmt.Errorf("git commit: %s", stderr)
}
@ -1189,9 +1222,24 @@ func getRepoInitFile(tp, name string) ([]byte, error) {
}
func prepareRepoCommit(e Engine, repo *Repository, tmpDir, repoPath string, opts CreateRepoOptions) error {
commitTimeStr := time.Now().Format(time.RFC3339)
authorSig := repo.Owner.NewGitSig()
// Because this may call hooks we should pass in the environment
env := append(os.Environ(),
"GIT_AUTHOR_NAME="+authorSig.Name,
"GIT_AUTHOR_EMAIL="+authorSig.Email,
"GIT_AUTHOR_DATE="+commitTimeStr,
"GIT_COMMITTER_NAME="+authorSig.Name,
"GIT_COMMITTER_EMAIL="+authorSig.Email,
"GIT_COMMITTER_DATE="+commitTimeStr,
)
// Clone to temporary path and do the init commit.
_, stderr, err := process.GetManager().Exec(
_, stderr, err := process.GetManager().ExecDirEnv(
-1, "",
fmt.Sprintf("initRepository(git clone): %s", repoPath),
env,
git.GitExecutable, "clone", repoPath, tmpDir,
)
if err != nil {
@ -1282,7 +1330,7 @@ func initRepository(e Engine, repoPath string, u *User, repo *Repository, opts C
}
// Apply changes and commit.
if err = initRepoCommit(tmpDir, u.NewGitSig()); err != nil {
if err = initRepoCommit(tmpDir, u); err != nil {
return fmt.Errorf("initRepoCommit: %v", err)
}
}