forgejo/modules/git/repo_tree.go
zeripath fcb535c5c3
Sign merges, CRUD, Wiki and Repository initialisation with gpg key (#7631)
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.
2019-10-16 14:42:42 +01:00

111 lines
2.7 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// 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 git
import (
"bytes"
"fmt"
"os"
"strings"
"time"
"github.com/mcuadros/go-version"
)
func (repo *Repository) getTree(id SHA1) (*Tree, error) {
gogitTree, err := repo.gogitRepo.TreeObject(id)
if err != nil {
return nil, err
}
tree := NewTree(repo, id)
tree.gogitTree = gogitTree
return tree, nil
}
// GetTree find the tree object in the repository.
func (repo *Repository) GetTree(idStr string) (*Tree, error) {
if len(idStr) != 40 {
res, err := NewCommand("rev-parse", "--verify", idStr).RunInDir(repo.Path)
if err != nil {
return nil, err
}
if len(res) > 0 {
idStr = res[:len(res)-1]
}
}
id, err := NewIDFromString(idStr)
if err != nil {
return nil, err
}
resolvedID := id
commitObject, err := repo.gogitRepo.CommitObject(id)
if err == nil {
id = SHA1(commitObject.TreeHash)
}
treeObject, err := repo.getTree(id)
if err != nil {
return nil, err
}
treeObject.ResolvedID = resolvedID
return treeObject, nil
}
// CommitTreeOpts represents the possible options to CommitTree
type CommitTreeOpts struct {
Parents []string
Message string
KeyID string
NoGPGSign bool
AlwaysSign bool
}
// CommitTree creates a commit from a given tree id for the user with provided message
func (repo *Repository) CommitTree(sig *Signature, tree *Tree, opts CommitTreeOpts) (SHA1, error) {
binVersion, err := BinVersion()
if err != nil {
return SHA1{}, err
}
commitTimeStr := time.Now().Format(time.RFC3339)
// 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,
)
cmd := NewCommand("commit-tree", tree.ID.String())
for _, parent := range opts.Parents {
cmd.AddArguments("-p", parent)
}
messageBytes := new(bytes.Buffer)
_, _ = messageBytes.WriteString(opts.Message)
_, _ = messageBytes.WriteString("\n")
if version.Compare(binVersion, "1.7.9", ">=") && (opts.KeyID != "" || opts.AlwaysSign) {
cmd.AddArguments(fmt.Sprintf("-S%s", opts.KeyID))
}
if version.Compare(binVersion, "2.0.0", ">=") && opts.NoGPGSign {
cmd.AddArguments("--no-gpg-sign")
}
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
err = cmd.RunInDirTimeoutEnvFullPipeline(env, -1, repo.Path, stdout, stderr, messageBytes)
if err != nil {
return SHA1{}, concatenateError(err, stderr.String())
}
return NewIDFromString(strings.TrimSpace(stdout.String()))
}