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hooks: Harden when we accept push options that change repo settings

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It is possible to change some repo settings (its visibility, and
template status) via `git push` options: `-o repo.private=true`, `-o
repo.template=true`.

Previously, there weren't sufficient permission checks on these, and
anyone who could `git push` to a repository - including via an AGit
workflow! - was able to change either of these settings. To guard
against this, the pre-receive hook will now check if either of these
options are present, and if so, will perform additional permission
checks to ensure that these can only be set by a repository owner or
an administrator. Additionally, changing these settings is disabled for
forks, even for the fork's owner.

There's still a case where the owner of a repository can change the
visibility of it, and it will not propagate to forks (it propagates to
forks when changing the visibility via the API), but that's an
inconsistency, not a security issue.

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>
This commit is contained in:
Gergely Nagy 2024-04-15 10:07:45 +02:00 • committed by Earl Warren
parent b7cff17de1
commit cc80e66153
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2 changed files with 108 additions and 25 deletions
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78
tests/integration/git_push_test.go
View file

@ -8,29 +8,20 @@ import (
"testing"
"code.gitea.io/gitea/models/db"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/models/unittest"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/git"
repo_module "code.gitea.io/gitea/modules/repository"
repo_service "code.gitea.io/gitea/services/repository"
"github.com/stretchr/testify/require"
)
func TestGitPush(t *testing.T) {
onGiteaRun(t, testGitPush)
func TestOptionsGitPush(t *testing.T) {
onGiteaRun(t, testOptionsGitPush)
}
func testGitPush(t *testing.T, u *url.URL) {
t.Run("Push branch with options", func(t *testing.T) {
runTestGitPush(t, u, func(t *testing.T, gitPath string) {
branchName := "branch-with-options"
doGitCreateBranch(gitPath, branchName)(t)
doGitPushTestRepository(gitPath, "origin", branchName, "-o", "repo.private=true", "-o", "repo.template=true")(t)
})
})
}
func runTestGitPush(t *testing.T, u *url.URL, gitOperation func(t *testing.T, gitPath string)) {
func testOptionsGitPush(t *testing.T, u *url.URL) {
user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
repo, err := repo_service.CreateRepository(db.DefaultContext, user, user, repo_service.CreateRepoOptions{
Name: "repo-to-push",
@ -46,22 +37,59 @@ func runTestGitPush(t *testing.T, u *url.URL, gitOperation func(t *testing.T, gi
doGitInitTestRepository(gitPath)(t)
oldPath := u.Path
oldUser := u.User
defer func() {
u.Path = oldPath
u.User = oldUser
}()
u.Path = repo.FullName() + ".git"
u.User = url.UserPassword(user.LowerName, userPassword)
doGitAddRemote(gitPath, "origin", u)(t)
gitRepo, err := git.OpenRepository(git.DefaultContext, gitPath)
require.NoError(t, err)
defer gitRepo.Close()
{
// owner sets private & template to true via push options
branchName := "branch1"
doGitCreateBranch(gitPath, branchName)(t)
doGitPushTestRepository(gitPath, "origin", branchName, "-o", "repo.private=true", "-o", "repo.template=true")(t)
repo, err := repo_model.GetRepositoryByOwnerAndName(db.DefaultContext, user.Name, "repo-to-push")
require.NoError(t, err)
require.True(t, repo.IsPrivate)
require.True(t, repo.IsTemplate)
}
gitOperation(t, gitPath)
{
// owner sets private & template to false via push options
branchName := "branch2"
doGitCreateBranch(gitPath, branchName)(t)
doGitPushTestRepository(gitPath, "origin", branchName, "-o", "repo.private=false", "-o", "repo.template=false")(t)
repo, err = repo_model.GetRepositoryByOwnerAndName(db.DefaultContext, user.Name, "repo-to-push")
require.NoError(t, err)
require.False(t, repo.IsPrivate)
require.False(t, repo.IsTemplate)
}
{
// create a collaborator with write access
collaborator := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
u.User = url.UserPassword(collaborator.LowerName, userPassword)
doGitAddRemote(gitPath, "collaborator", u)(t)
repo, err := repo_model.GetRepositoryByOwnerAndName(db.DefaultContext, user.Name, "repo-to-push")
require.NoError(t, err)
repo_module.AddCollaborator(db.DefaultContext, repo, collaborator)
}
{
// collaborator with write access is allowed to push
branchName := "branch3"
doGitCreateBranch(gitPath, branchName)(t)
doGitPushTestRepository(gitPath, "collaborator", branchName)(t)
}
{
// collaborator with write access fails to change private & template via push options
branchName := "branch4"
doGitCreateBranch(gitPath, branchName)(t)
doGitPushTestRepositoryFail(gitPath, "collaborator", branchName, "-o", "repo.private=true", "-o", "repo.template=true")(t)
repo, err = repo_model.GetRepositoryByOwnerAndName(db.DefaultContext, user.Name, "repo-to-push")
require.NoError(t, err)
require.False(t, repo.IsPrivate)
require.False(t, repo.IsTemplate)
}
require.NoError(t, repo_service.DeleteRepositoryDirectly(db.DefaultContext, user, user.ID, repo.ID))
}